JPH06194688A - Thin-film transistor matrix device and its production - Google Patents

Abstract

PURPOSE:To provide the thin-film transistor (TFT) matrix device which can be easily produced with the low resistance value of drain bus lines and the process for production of the device relating to the TFT matrix device of an active matrix type liquid crystal display device which executes display control by TFTs and the process for production of the device. CONSTITUTION:Plural pixel electrodes 4 disposed in a matrix form, the plural TFTs, the drain bus lines 21 commonly connecting the drain electrodes of the TFTs and gate bus lines 31 commonly connecting the gate electrodes of the TFTs are formed on an insulating substrate 40. First metallic films 10a, 10b on the drain bus lines 21 in the intersected parts with the drain bus lines 31 are connected between the intersected parts by second metallic films 11 electrodeposited on the drain bus lines 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film transistor matrix device used in an active matrix type liquid crystal display device which performs display control by a thin film transistor provided for each pixel, and a manufacturing method thereof. The active matrix type liquid crystal display device is used as a thin type information terminal display device together with the simple matrix type liquid crystal display device. The active matrix liquid crystal display device can independently drive a large number of pixels arranged in a matrix. Therefore, even if the number of lines to be driven increases as the number of pixels increases, the duty ratio of the drive signal decreases, the contrast decreases, and the viewing angle decreases, as in a simple matrix liquid crystal display device. It has the advantage of not causing problems such as causing problems.
Therefore, the active matrix type liquid crystal display device can obtain a color display similar to that of a cathode ray tube (CRT), and its application is expanding as a thin flat display.

However, in a thin film transistor matrix substrate used for an active matrix type liquid crystal display device, it is necessary to have a complicated structure in which a thin film transistor is provided as a switching element for each pixel, and its manufacturing process is also complicated. Therefore, particularly in the case of a large-sized active matrix type liquid crystal display device, there is a problem that the manufacturing yield is significantly reduced and the cost is increased. Therefore, attempts have been made to simplify the structure of the active matrix liquid crystal display device and reduce its manufacturing cost.

Further, as the screen size of the active matrix type display device becomes larger, the wiring length of the bus line for transmitting the signal from the external drive circuit becomes longer, and the liquid crystal capacity and the parasitic capacity which become the load of the bus line also increase. . Therefore, the signal delay determined by the resistance of the bus line and the load capacitance becomes large, and this signal delay causes deterioration of display quality. Therefore, in order to suppress the deterioration of display quality, it is necessary to reduce the bus line resistance and reduce the occurrence of signal delay.

According to the present invention, a thin film transistor matrix device used for such an active matrix type liquid crystal display device can be manufactured with a high yield by a simple process, and at the same time, the bus line resistance can be reduced and a high display quality can be obtained. A thin film transistor matrix device and a method for manufacturing the same are provided.

[0005]

2. Description of the Related Art A thin film transistor matrix device used in a conventional active matrix type liquid crystal display device is shown in FIG.
It demonstrates using FIG. 23 thru | or FIG. 21 (a) and 21 (b)
Shows a thin film transistor matrix device manufactured by a simple forming method disclosed in, for example, JP-A-59-501562 and JP-A-62-500475.

In the thin film transistor matrix device according to this simple forming method, the source electrode 1, the drain electrode 2, the drain bus line 21, the pixel electrode 4 made of the transparent conductive film 5 are formed on the insulating substrate 40 by using the first mask. After patterning each part of, the semiconductor layer 6, the insulator layer 7, and the gate electrode layer 8 are laminated thereon, the gate electrode layer 8, the insulator layer 7, and the semiconductor layer 6 are formed using the second mask. Is removed by etching, and the gate bus line 3 also serves as the gate electrode 3.
1 pattern formation and thin film transistor element isolation.

FIG. 21B shows a cross section of the drain bus line 21 taken along the line LL 'in the plan view of FIG. As shown in FIG. 21B, the drain bus line 21 is made of the same transparent conductive film 5 as the pixel electrode 4. In addition, FIGS.
22 shows a thin film transistor matrix device in which the resistance of the drain bus line in the conventional example shown in FIG. 21 is reduced.

In this thin film transistor matrix device, the electrode layer for patterning with the first mask is a laminated film consisting of the transparent conductive film 5 and the metal film 9. Then, as in the case of FIG. 21, the gate bus lines 31a, 3a also serving as the gate electrode 3 are formed by using the second mask.
After patterning 1b and element isolation by etching the insulator layer 7 and the semiconductor layer 6, the pixel electrode 4 is made transparent by etching the metal film 9 on the pixel electrode 4.

In order to reduce the resistance of the drain bus line, by leaving the gate electrode layer 8 in the region 24 on the drain bus line 21 between the gate bus lines 31a and 31b, the metal film 9 located therebelow is removed. The structure is left. The conventional thin-film transistor matrix device shown in FIGS. 21 and 22 has a problem that the resistance of the drain bus line becomes high.

That is, in the conventional example shown in FIG. 21, since the drain bus line 21 is made of a transparent conductive film having a higher specific resistance than a metal film, the resistance of the drain bus line becomes high. If the film thickness of the transparent conductive film is increased to reduce the resistance, the coverage of the semiconductor layer 6 formed on the transparent electrode film is deteriorated and the on-characteristics of the TFT are adversely affected. The resistance of the drain bus line 21 is inevitably high as a result.

Further, in the conventional example shown in FIG. 22, the drain bus line 21 is divided into a region 24 on the drain bus line 21 between the gate bus lines 31a and 31b and regions 23a and 23b overlapping the gate bus lines 31a and 31b. A laminated structure composed of the transparent conductive film 5 and the metal film 9,
The resistance value is lower than that of the conventional example of FIG. However, the drain bus line 2 between the gate bus lines 31a and 31b
The gate electrode layer 8 is left in the region 24 above the gate electrode layer 8 and at least one gate bus line 3
When 1a or 31b is electrically connected, there is a problem that capacitive coupling between the bus lines is increased and a drive waveform is distorted, or a short circuit between the bus lines is likely to occur. Therefore, it is necessary to provide regions 25 and 26 that do not leave the gate electrode layer 8 between the region 24 on the drain bus line 21 and the gate bus lines 31a and 31b.

Regions 25 and 26 where the gate electrode layer 8 is not left
Is provided, the metal film 9 laminated on the transparent conductive film 5 is removed to make the pixel electrode 4 transparent.
The metal layer 9 on 5, 26 is also etched away at the same time. Therefore, as shown in FIG. 22B, in the regions 25 and 26 where the gate electrode layer 8 is not left, the drain bus line 21 is the transparent conductive film 5 only, and the resistance of the transparent conductive film 5 in this portion causes the drain bus line 21 to drain. Lines 31a, 31b
It was unavoidable that the resistance value of was increased.

Another conventional method of manufacturing a thin film transistor matrix device will be described with reference to FIG. A thin film transistor matrix device is usually provided with a transparent pixel electrode portion for obtaining a bright display and a drain bus line portion for obtaining a low resistance. Therefore, the pixel electrode is formed of a transparent conductive film, and the drain bus line is formed by laminating a metal film on the transparent conductive film.

First, the transparent conductive film 52 is formed on the entire surface of the insulating substrate 50.
And the first resist 54 is patterned to form pixel electrodes and drain bus lines. continue,
The transparent conductive film 52 is formed by using the first resist 54 as a mask.
By etching the pixel electrode 56 and the drain bus line 5
8 is formed (FIG. 23A). Next, a metal film 6 is formed on the entire surface.
0 (FIG. 23B), and the second resist 62 is patterned so as to form a drain bus line.
Subsequently, the metal film 60 is etched by using the second resist 62 as a mask to form the drain bus line 58 (FIG. 23C).

In this way, the pixel electrode 56 is connected to the transparent conductive film 52.
By forming the pixel electrode only with the transparency, the transparency of the pixel electrode is secured, and by laminating the metal film 60 on the drain bus line 58, the resistance value of the drain bus line is lowered. However, in the conventional manufacturing method shown in FIG. 23, since the pixel electrode and the drain bus line are formed by two photolithography processes using different resists 54 and 62, the first resist 54 and the second resist 62 are formed. It is necessary to design in consideration of the alignment margin, and there is a problem that the area required for the bus line becomes large and the aperture ratio decreases.

[0016]

Thus, as shown in FIG.
In the conventional example shown in FIG. 22, although it can be easily manufactured by a simplified manufacturing process, there is a problem that the resistance of the drain bus line becomes high. Also, FIG.
In the conventional example shown in, although the transparency of the pixel electrode can be secured and the resistance value of the drain bus line can be lowered,
The area required to form the drain bus line increases,
There is a problem that the area of the pixel electrode is reduced and the aperture ratio is reduced.

It is an object of the present invention to provide a thin film transistor matrix device having a low resistance value of a drain bus line and easily manufactured, and a manufacturing method thereof. Another object of the present invention is to provide a thin film transistor matrix device capable of increasing the area of a pixel electrode by reducing the area required for forming a drain bus line, and a manufacturing method thereof.

[0018]

The above object is to provide an insulating substrate, a plurality of pixel electrodes arranged in a matrix on the insulating substrate, and a plurality of thin film transistors in which a source electrode is connected to each pixel electrode. A drain bus line that is wired between the pixel electrodes in a first direction and commonly connects the drain electrodes of the thin film transistors, and a drain bus line between the pixel electrodes in a second direction orthogonal to the first direction. In a thin film transistor matrix device having a gate bus line which is wired to intersect and which commonly connects the gate electrodes of the thin film transistors, a first metal film formed on the drain bus line at an intersection intersecting with the gate bus line. And formed on the drain bus line between intersections intersecting the gate bus line, It is achieved by a thin film transistor matrix device characterized by a second metal film for connecting the serial first metal film.

The above-mentioned object is to provide an insulating substrate, a plurality of pixel electrodes arranged in a matrix on the insulating substrate, a plurality of thin film transistors having a source electrode connected to each pixel electrode, and a plurality of pixel electrodes between the pixel electrodes. A drain bus line that is wired in one direction and commonly connects the drain electrodes of the thin film transistors, and is wired between the pixel electrodes in a second direction orthogonal to the first direction so as to intersect the drain bus line, A method of manufacturing a thin film transistor matrix device having a gate bus line commonly connecting gate electrodes of the thin film transistors, wherein a transparent conductive film and a metal film are laminated on the insulating substrate, and the transparent conductive film and the metal film are at least the drain. Patterning into a shape including a bus line or the gate bus line and the pixel electrode; By energizing the drain bus line or the gate bus line in a solution, a film is formed only on the drain bus line or the gate bus line and the pattern electrically connected to the drain bus line or the gate bus line. Etching the metal film on the pixel electrode using as a mask a film formed only in a pattern electrically connected to the drain bus line or the gate bus line and the drain bus line or the gate bus line. And a step of removing the thin film transistor matrix device.

The above-mentioned object is to form a transparent conductive film on the insulating substrate, and pattern the transparent conductive film into the shapes of the pixel electrode, the source and drain electrodes of the thin film transistor, and the drain bus line. When,
A step of selectively electrodepositing a metal film on the surface of the transparent conductive film of the drain bus line by energizing the drain bus line in an electrolytic solution, and stacking a semiconductor layer, a gate insulating layer and a gate electrode layer Patterning the semiconductor layer, the gate insulating layer, and the gate electrode layer into a shape of the gate bus line intersecting with the drain bus line, and exposing the transparent conductive film of the pixel electrode. And a method of manufacturing a thin film transistor matrix device.

The above object is to form a transparent conductive film and a first metal film on the insulating substrate, and to form the transparent conductive film and the first metal film on the pixel electrode and the source and drain electrodes of the thin film transistor. And a step of patterning into the shape of the drain bus line, and by electrifying the drain bus line in an electrolytic solution, a protective film is selectively electrodeposited on the surface of the first metal film of the drain bus line. And a step of exposing the transparent conductive film by etching away the first metal film on the pixel electrode using the electrodeposited protective film as a mask, and forming the semiconductor layer, the gate insulating layer, and the gate electrode layer. Stacking, patterning the semiconductor layer, the gate insulating layer, and the gate electrode layer in the shape of the gate bus line intersecting with the drain bus line, and It is achieved by the method for manufacturing a thin film transistor matrix device characterized by having a step of exposing the transparent conductive film electrodes.

The above-mentioned object is to form a transparent conductive film and a first metal film on the insulating substrate, and to form the transparent conductive film and the first metal film on the pixel electrode and the source and drain electrodes of the thin film transistor. And a step of patterning into the shape of the drain bus line, and by selectively energizing the drain bus line in an electrolytic solution, a second metal film is selectively formed on the surface of the first metal film of the drain bus line. Electrodeposition, stacking a semiconductor layer, a gate insulating layer, and a gate electrode layer, and patterning the semiconductor layer, the gate insulating layer, and the gate electrode layer into the shape of the gate bus line intersecting the drain bus line. And using the gate electrode layer of the gate bus line as a mask, the first metal film on the pixel electrode is selectively removed by etching. It is achieved by the method for manufacturing a thin film transistor matrix device characterized by a step of exposing the transparent conductive film.

In the method of manufacturing a thin film transistor matrix device described above, it is desirable to energize the gate bus line when energizing the drain bus line in an electric field solution. The purpose is to form the gate bus line on the insulating substrate, stack a gate insulating layer and a semiconductor layer, and pattern the semiconductor layer into a shape of the gate electrode and the gate bus line of the thin film transistor. Forming a transparent conductive film and a first metal film, and patterning the transparent conductive film and the first metal film into shapes of the pixel electrode, the source and drain electrodes of the thin film transistor, and the drain bus line. And a step of selectively electrodepositing a resist on the surface of the first metal film of the drain bus line by energizing the drain bus line in an electrolytic solution,
And a step of selectively etching away the first metal film on the pixel electrode using the resist as a mask to expose the transparent conductive film. It

The above object is to form a transparent conductive film and a first metal film on the insulating substrate, and to form the transparent conductive film, the first metal film, the pixel electrode, the gate electrode of the thin film transistor, Patterning into the shape of the gate bus line, and energizing the gate bus line in an electrolytic solution to selectively electrodeposit a resist on the surface of the first metal film of the gate bus line, Stacking a gate insulating layer and a semiconductor layer, patterning the gate insulating film and the semiconductor layer into the shape of the thin film transistor to separate elements, and forming a second metal film,
And a step of patterning the second metal film so as to have the shapes of the drain bus line and the source electrode.

The above object is to form a first metal film on the insulating substrate and pattern the first metal film into the shapes of the drain bus line and the drain and source electrodes of the thin film transistor. A semiconductor layer, a gate insulating layer and a gate electrode layer are stacked,
Patterning the gate insulating layer and the gate electrode layer into the shape of the gate bus line and the gate electrode; forming a transparent conductive film and a second metal film; and forming the transparent conductive film and the second metal film. Patterning into the shape of the pixel electrode and the gate bus line, and selecting the second metal film of the gate bus line and the surface of the gate electrode by energizing the gate bus line in an electrolytic solution. A step of selectively electrodepositing a resist, and a step of selectively etching away the second metal film on the pixel electrode to expose the transparent conductive film using the resist as a mask. And a method for manufacturing a thin film transistor matrix device.

In the method of manufacturing the thin film transistor matrix device, the electrodeposited resist is irradiated with ultraviolet rays while shielding the bus line terminal portion of the drain bus line or the gate bus line, and the bus line terminal portion is developed at the time of development. The resist on the upper side is removed, and the second resist on the bus line terminal portion is removed using the resist as a mask.
It is desirable to selectively remove the metal film of 1) by etching to expose the transparent conductive film.

In the method of manufacturing the thin film transistor matrix device, it is desirable that the electrodeposition voltage for electrodepositing the resist is within the range of about 3V to 50V. Further, it is desirable to dry the electrodeposited resist within a range of about 40 ° C to 75 ° C. Further, it is desirable that the temperature of the electric field solution at the time of electrodeposition is within the range of about 5 ° C to 20 ° C.

[0028]

According to the present invention, it is possible to realize a high image quality active matrix type display device in which the drain bus line resistance can be reduced and the display quality does not deteriorate such as the occurrence of crosstalk in a large area display and the deterioration of contrast. In addition, since it becomes possible to manufacture with a high yield in a simple process, it is possible to realize a low-cost active matrix display device.

Furthermore, since the resist for etching away the metal layer of the display electrode portion can be selectively formed only in the bus line portion in a self-aligning manner, a photolithography method that requires high precision alignment using a stepper or the like. The number of steps can be reduced and the manufacturing process can be simplified. In addition, since it is not necessary to consider the alignment margin when designing the pattern, the area of the display electrode pattern can be increased and the aperture ratio can be increased.

[0030]

【Example】

[First Embodiment] A thin film transistor matrix device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the structure of a thin film transistor matrix device according to the present embodiment, and FIG.
1B is a sectional view taken along line LL ′ in FIG.
FIG. 1C shows a cross-sectional view taken along the line 11 ′ of FIG.

A plurality of pixel electrodes 4 are arranged in a matrix on the insulating substrate 40. Between each pixel electrode 4 is shown in FIG.
As shown in (a), the drain bus line 21 extends in the vertical direction.
Are wired, the gate bus lines 31 are wired in the horizontal direction, and the thin film transistors are arranged at positions where the drain bus lines 21 and the gate bus lines 31 intersect. The source electrode 1 of the thin film transistor is the gate bus line 3
1 is formed below the pixel electrode 4 so as to project from the upper left portion of the pixel electrode 4. The drain electrode 2 of the thin film transistor is formed below the gate bus lines 31 on both left and right sides of the source electrode 1. The drain electrode 2 on the left side of the source electrode 1 is formed continuously with the drain bus line 21, and the drain electrode on the right side is connected to the drain bus line 21.

The drain bus line 21 has a gate bus line 31 as shown in the sectional view taken along the line LL 'in FIG.
The first metal films 10a and 10b, the semiconductor film 6, the gate insulating film 7, and the gate electrode film 8 are laminated on the transparent conductive film 5 at the intersection with the transparent conductive film. A second metal film 11 is stacked on the metal film 5. The second metal film 11 formed between the intersections is connected to the first metal films 10a and 10b at the intersections.

On the source electrode 1 of the thin film transistor,
As shown in FIG. 1C, the gate bus lines 31 in which the first metal film 10, the semiconductor film 6, the gate insulating film 7, and the gate electrode film 8 are laminated intersect with each other. On the other hand, the transparent conductive film 5 connecting the drain electrode 2 is covered with the second metal film 11. Thus, according to this embodiment, the second metal film 11 is formed on the transparent conductive film 5 also on the drain bus line 21 between the intersections with the gate bus line 31.
The second metal film 11 is the first metal film 10a at the intersection,
Since it is connected to 10b, the resistance value of the drain bus line 21 can be lowered.

Next, a method of manufacturing the thin film transistor matrix device of this embodiment will be described with reference to FIG. Figure 2
(A) to (e) show l in FIG. 1 (a) in each manufacturing process.
FIG. 6 is a process cross-sectional view showing a cross section taken along the line −l ′. First, a transparent conductive film 5 made of ITO having a film thickness of 50 nm and a first metal film 10 made of Cr having a film thickness of 150 nm are laminated on the insulating substrate 40 by a sputtering method, and then this laminated film is patterned. Then, the source electrode portion, the drain electrode portion, the drain bus line portion, and the pixel electrode portion are formed (FIG. 2).
(A)).

Next, the insulating substrate 40 and the first metal film 10
A semiconductor film 6 made of amorphous silicon (a-Si) having a film thickness of 30 nm and a gate insulating film 7 made of silicon nitride (SiN) having a film thickness of 400 nm are laminated thereon by a plasma CVD method, and further, a sputtering method is used. , Film thickness 20
The gate electrode film 8 made of 0 nm Cr is formed (FIG. 2).
(B)).

Next, a resist is formed on the entire surface and is patterned so as to remain on the region where the gate bus line including the gate electrode is to be formed to form a resist 15 (FIG. 2C). Next, the gate electrode film 8, the gate insulating film 7, and the semiconductor film 6 are selectively removed by etching using the resist 15 as a mask, and subsequently, the first metal film 10 is also removed by etching using the resist 15 as a mask (FIG. Two
(D)).

Next, after removing the resist 15, electrodeposition is carried out in an electrolytic solution containing Cr ions by using the drain bus line 21 of the thin film transistor matrix device as a cathode and the Cr plate as an anode to form a film made of Cr. Thickness 20
The second metal film 11 of 0 nm is formed only on the exposed portion of the drain bus line 21, the second metal film 11 is formed around the transparent electrode film 5 (FIG. 2E), and the gate bus line 31 is formed. The second metal film 11 is formed on the transparent conductive film 5 of the drain bus line 21 between the intersections with (see FIG. 1).
(B)). With this second metal film 11, the first portion of the intersection is
The metal films 10a and 10b are electrically connected.

Thus, the thin film transistor matrix device is completed. After that, a polyimide film (not shown) is applied to the entire surface of the thin film transistor matrix device for controlling the alignment of the liquid crystal, a counter electrode substrate (not shown) is attached, and a liquid crystal (not shown) is provided between the thin film transistor matrix device and the counter electrode substrate. , The TFT active matrix type liquid crystal display device is completed.

In the above-described manufacturing method, when the second metal film 11 is electrodeposited, a current is also left in the gate bus line 31 so that the second metal film 11 is deposited on the gate bus line 31.
It is possible to protect the gate bus line 31 and reduce its resistance by covering the metal film 11 of FIG. Further, in the above-described manufacturing method, the resist 15 is removed before electrodeposition of the second metal film 11, but if the second metal film 11 is electrodeposited with the resist 15 left, It is possible to prevent the gate electrode film 8 from being contaminated due to contact with the electrolytic solution during electrodeposition.

As described above, according to the manufacturing method of this embodiment, metal is electrodeposited in the electrolytic solution using the drain bus line 21 as a cathode, so that the drain bus line 21 and the gate bus line 31 have a space between the intersections. The second metal film 11 can be selectively deposited on the drain bus line. Therefore, the second metal film 11 can be formed in a self-aligning manner by a simple manufacturing process without forming a resist for forming the second metal film 11. [Second Embodiment] A thin film transistor matrix device according to a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment shown in FIGS. 1 and 2 are designated by the same reference numerals to omit or simplify the description.

The plan view of the thin film transistor matrix device of this embodiment is the same as that of FIG.
FIG. 3D is a process cross-sectional view showing a cross-section taken along the line ll ′ of FIG. 1A in each manufacturing process, and FIG. 3E is a cross-sectional view taken along the line LL ′ of FIG. is there. First, regarding the structure of the thin film transistor matrix device of the present embodiment, FIG.
This will be described with reference to (a), FIG. 3 (d) and FIG. 3 (e).

As the drain bus line 21 vertically arranged on the insulating substrate 40, as shown in the sectional view taken along the line LL ′ of FIG. The first metal film 10 is formed. A semiconductor film 6, a gate insulating film 7, and a gate electrode film 8 are laminated on the intersection with the gate bus line 31, and the surface of the first metal film 10 on the transparent conductive film 5 is between these intersections. Are covered with the anodic oxide film 12. First metal film 1
Zeros are continuously formed over the entire drain bus line 21.

On the source electrode 1 of the thin film transistor,
As shown in FIG. 3D, the gate bus lines 31 in which the first metal film 10, the semiconductor film 6, the gate insulating film 7, and the gate electrode film 8 are laminated intersect with each other. On the other hand, the first metal film 10 is formed on the transparent conductive film 5 that connects the drain electrode 2, and the surface of the first metal film 10 is covered with the anodic oxide film 12.

As described above, according to this embodiment, the first metal film 1 is continuously formed over the entire drain bus line 21.
Since 0 is formed, the resistance value of the drain bus line 21 can be lowered. Further, according to this embodiment, since the drain bus line 21 and the gate bus line 31 are covered with the anodic oxide film 12, the anodic oxide film 12 and the drain bus line 21 and the gate bus line 31 are made of liquid crystal. It can function as a passivation film that protects from influences, and can prevent influences such as occurrence of display failure due to current flowing during display operation of the liquid crystal display panel and shortening of the life of the liquid crystal. The reliability of the liquid crystal display device can be improved.

Next, a method of manufacturing the thin film transistor matrix device of this embodiment will be described with reference to FIG. First, in the same manner as in the steps of FIGS. 2A to 2C in the first embodiment, patterning is performed so as to remain on the region on the gate electrode film 8 where the gate bus line including the gate electrode is to be formed. To form a resist 15 (FIG. 3).
(A)).

Next, the gate electrode film 8, the gate insulating film 7, and the semiconductor film 6 are selectively removed by etching using the resist 15 as a mask (FIG. 3B). Next, resist 1
After removing 5 the first metal film 1 as in the first embodiment.
The first metal film 10 is anodized in the electrolytic solution using the drain bus line 21 as an anode without removing 0 by etching. As a result, the first drain bus line 21
The anodic oxide film 12 is selectively formed on the surface of the metal film 10. First metal film 10 on the source electrode 1 and the pixel electrode 4
No anodic oxide film is formed on the surface (FIG. 3C). Since Al is used as the material of the first metal film 10 in this embodiment, the dense anodic oxide film 12 is formed on the surface thereof.

Next, using the anodic oxide film 12 as a mask, the first metal film 10 except on the drain bus line 21 is removed by etching. The first metal film 10 on the source electrode 1 and the pixel electrode 4 is removed by etching (FIG. 3D). Since the anodic oxide film 12 is formed on the surface of the first metal film 10 of the drain bus line 21, the first metal film 10 is continuously formed over the entire drain bus line 21 without being removed by etching. It is possible to reduce the resistance of the drain bus line 21.

In the manufacturing method described above, the gate bus line 31 is used when the first metal film 10 is anodized.
Alternatively, an anodic oxide film may be formed on the surface of the gate bus line 31 by leaving a current. Corrosion of the gate bus line 31 during the subsequent etching removal of the first metal film 10 can be prevented. Further, in the above-described manufacturing method, the resist 15 is removed before anodizing the first metal film 10, but if the first metal film 10 is anodized with the resist 15 left, It is possible to prevent the gate electrode film 8 from being contaminated due to contact with the electrolytic solution during anodization.

As described above, according to the manufacturing method of this embodiment, the first metal film 10 is anodized by using the drain bus line 21 as an anode, and the anodic oxide film 12 formed on the surface of the first metal film 10. With the mask as the drain bus line 2
Since the first metal film 10 other than the first metal film 10 is selectively removed by etching, the first metal film 10 can be continuously formed in a self-aligned manner over the entire drain bus line 21 by a simple manufacturing process. . [Third Embodiment] A thin film transistor matrix device according to a third embodiment of the present invention will be described with reference to FIG. The same components as those of the second embodiment shown in FIG. 3 are designated by the same reference numerals to omit or simplify the description.

The plan view of the thin film transistor matrix device of this embodiment is the same as that of FIG.
FIG. 4C is a process cross-sectional view showing a cross section taken along the line ll ′ of FIG. 1A in each manufacturing process, and FIG. 4D is a cross-sectional view taken along the line LL ′ of FIG. is there. First, regarding the structure of the thin film transistor matrix device of the present embodiment, FIG.
This will be described with reference to (a), FIG. 4 (c) and FIG. 4 (d).

As the drain bus line 21 vertically arranged on the insulating substrate 40, the first metal film 10 is formed on the transparent conductive film 5 as shown in the sectional view taken along the line LL 'of FIG. 4 (d).
Are formed. The semiconductor film 6, the gate insulating film 7, and the gate electrode film 8 are stacked on the intersection with the gate bus line 31, and the first metal film 1 is provided between these intersections.
0 surface is covered with the resin film 13. The first metal film 10 is continuously formed over the entire drain bus line 21.

On the source electrode 1 of the thin film transistor,
As shown in FIG. 4C, the gate bus lines 31 in which the first metal film 10, the semiconductor film 6, the gate insulating film 7, and the gate electrode film 8 are laminated intersect with each other. On the other hand, the first metal film 10 is formed on the transparent conductive film 5 that connects the drain electrode 2, and the surface of the first metal film 10 is covered with the resin film 13.

As described above, according to this embodiment, the first metal film 1 is continuously formed over the entire drain bus line 21.
Since 0 is formed, the resistance value of the drain bus line 21 can be lowered. Further, according to the present embodiment, since the drain bus line 21 and the gate bus line 31 are covered with the resin film 13, the resin film 1
3, the drain bus line 21 and the gate bus line 31
Can function as a passivation film that protects the liquid crystal from the influence of the liquid crystal display panel, preventing the occurrence of display defects due to the flow of current during the display operation of the liquid crystal display panel and the shortening of the life of the liquid crystal. Therefore, the reliability of the liquid crystal display device can be improved.

Next, a method of manufacturing the thin film transistor matrix device of this embodiment will be described with reference to FIG. First, similar to the steps of FIGS. 4A and 4B in the second embodiment, the gate electrode film 8 and the gate insulating film 8 which are stacked as the gate bus line 31 including the gate electrode on the gate electrode film 8 are formed. The film 7 and the semiconductor film 6 are patterned (FIG. 4A). In this state, a voltage is applied to the drain bus line 21 in the resin emulsion solution to electrodeposit the resin on the first metal film 10. As a result, the resin film 13 is selectively formed on the surface of the first metal film 10 of the drain bus line 21. Source electrode 1 and pixel electrode 4
No resin film is formed on the surface of the upper first metal film 10 (FIG. 4B).

Next, using the resin film 13 as a mask, the first metal film 10 except on the drain bus line 21 is removed by etching. The first metal film 10 on the source electrode 1 and the pixel electrode 4 is removed by etching (FIG. 4C). The resin film 1 is formed on the surface of the first metal film 10 of the drain bus line 21.
3 is formed, the first metal film 10 is continuously formed over the entire drain bus line 21 without being removed by etching, and the resistance of the drain bus line 21 can be reduced (FIG. 4 (d). )).

In the above-described manufacturing method, when the resin is electrodeposited on the first metal film 10, the gate bus line 3
Gate bus line 3 by applying voltage to 1
The resin film 13 may be formed on one surface. Gate bus line 3 at the time of removing the first metal film 10 by etching thereafter
The erosion of 1 can be prevented. Further, in the above-described manufacturing method, the resist 15 was removed before electrodeposition of the resin film 13 on the first metal film 10, but the resin film 13 was formed on the first metal film 10 with the resist 15 left. Electrodeposition can prevent the gate electrode film 8 from being contaminated due to contact with the emulsion solution of the resin.

As described above, according to the manufacturing method of this embodiment, the voltage is applied to the drain bus line 21 to electrodeposit the resin film 13 on the first metal film 10, and the surface of the first metal film 10 is deposited. By using the formed resin film 13 as a mask, the first metal film 10 other than on the drain bus line 21 was selectively removed by etching, so that the first metal film 10 was entirely formed over the drain bus line 21 by a simple manufacturing process. Can be continuously formed in a self-aligned manner. [Fourth Embodiment] A thin film transistor matrix device according to a fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment shown in FIGS. 1 and 2 are designated by the same reference numerals to omit or simplify the description.

The plan view of the thin film transistor matrix device of this embodiment is the same as that of FIG.
FIG. 5E is a process cross-sectional view showing a cross section taken along the line ll ′ of FIG. 1A in each manufacturing process, and FIG. 5F is a cross-sectional view taken along the line LL ′ of FIG. is there. First, regarding the structure of the thin film transistor matrix device of the present embodiment, FIG.
This will be described with reference to (a), FIG. 5 (e), and FIG. 5 (f).

As the drain bus line 21 vertically arranged on the insulating substrate 40, as shown in the sectional view taken along the line LL ′ of FIG. 5F, the third metal film 16 is formed on the transparent conductive film 5.
Are formed. The semiconductor film 6, the gate insulating film 7, and the gate electrode film 8 are stacked on the intersection with the gate bus line 31. The third metal film 16 is continuously formed over the entire drain bus line 21.

On the source electrode 1 of the thin film transistor,
As shown in FIG. 5E, a gate bus line 31 in which a semiconductor film 6, a gate insulating film 7, and a gate electrode film 8 are stacked.
Are crossing. On the other hand, a third metal film 16 is formed on the transparent conductive film 5 that connects the drain electrode 2. Thus, according to this embodiment, the drain bus line 21
Since the third metal film 16 is continuously formed over the entire surface, the resistance value of the drain bus line 21 can be lowered.

Next, a method of manufacturing the thin film transistor matrix device of this embodiment will be described with reference to FIG. In the first to third embodiments described above, the selective formation of the film by the electrochemical method is performed after the pattern formation of the gate electrode layer 8, but in the present embodiment, the selective formation of the electrochemical film is performed. Is performed before the pattern formation of the gate electrode layer 8 and after the pattern formation of the source electrode portion, the drain electrode portion, the drain bus line portion and the pixel electrode portion.

First, the transparent conductive film 5 made of ITO having a film thickness of 50 nm is formed on the insulating substrate 40 by the sputtering method, and then the transparent conductive film 5 is patterned to form the source electrode 1 and the drain electrode 2. , Drain bus line 21
And the pixel electrode 4 is formed (FIG. 5A, FIG.
(A)). Next, the drain bus line 21 of the thin film transistor matrix device is placed in an electrolytic solution containing Cr ions.
Is used as a cathode and a Cr plate is used as an anode to perform electrodeposition, thereby electrodepositing a third metal film 16 of Cr having a thickness of 200 nm only on the exposed portion of the drain bus line 21,
A third metal film 16 is formed on the transparent electrode film 5 of the drain bus line 21 (FIGS. 5B and 5E).

Next, the insulating substrate 40, the first metal film 10,
A semiconductor film 6 made of amorphous silicon (a-Si) having a thickness of 30 nm and a silicon nitride (Si having a thickness of 400 nm) are formed on the third metal film 16 by plasma CVD.
The gate insulating film 7 made of N) is laminated, and the gate electrode film 8 made of Cr and having a film thickness of 200 nm is formed by the sputtering method (FIG. 5C).

Next, a resist is formed on the entire surface and patterned so as to remain on the region where the gate bus line including the gate electrode is to be formed, thereby forming the resist 15 (FIG. 5D). Next, the resist 15 is used as a mask to selectively remove the gate electrode film 8, the gate insulating film 7, and the semiconductor film 6 by etching (FIG. 5E).

Thus, the thin film transistor matrix device is completed. As described above, according to the manufacturing method of this embodiment, the drain bus line 21 is electrodeposited in the electrolytic solution to deposit a metal in the electrolytic solution.
The third metal film 16 can be selectively formed on the first transparent electrode film 5. Therefore, the third metal film 16 can be formed in a self-aligned manner by a simple manufacturing process without forming a resist for forming the third metal film 16. [Fifth Embodiment] A thin film transistor matrix device according to a fifth embodiment of the present invention will be described with reference to FIG. The same components as those of the fourth embodiment shown in FIG. 5 are designated by the same reference numerals to omit or simplify the description.

The plan view of the thin film transistor matrix device of the present embodiment is the same as that of FIG.
FIG. 6E is a process cross-sectional view showing a cross section taken along the line ll ′ of FIG. 1A in each manufacturing process, and FIG. 6F is a cross-sectional view taken along the line LL ′ of FIG. is there. First, regarding the structure of the thin film transistor matrix device of the present embodiment, FIG.
This will be described with reference to (a), FIG. 6 (e) and FIG. 6 (f).

As the drain bus line 21 vertically arranged on the insulating substrate 40, as shown in the sectional view taken along the line LL ′ of FIG. First metal film 10 and N having a film thickness of 200 nm
A third metal film 16 made of i is stacked. On the intersection with the gate bus line 31, the semiconductor film 6,
The gate insulating film 7 and the gate electrode film 8 are laminated. The first metal film 10 and the third metal film 16 are continuously formed over the entire drain bus line 21.

On the source electrode 1 of the thin film transistor,
As shown in FIG. 6E, a gate bus line 31 in which a semiconductor film 6, a gate insulating film 7, and a gate electrode film 8 are stacked.
Are crossing. On the other hand, the first metal film 10 is formed on the transparent conductive film 5 that connects the drain electrode 2, and the surface of the first metal film 10 is covered with the third metal film 16.
Thus, according to this embodiment, the drain bus line 2
Since the first metal film 10 and the third metal film 16 are continuously formed over the entire area 1, the drain bus line 2
The resistance value of 1 can be lowered.

Next, a method of manufacturing the thin film transistor matrix device of this embodiment will be described with reference to FIG. First, a 50 nm-thickness I film is formed on the insulating substrate 40 by the sputtering method.
A transparent conductive film 5 made of TO and a first metal film 10 are laminated, and then the laminated film is patterned to form a source electrode 1, a drain electrode 2, a drain bus line 21 and a pixel electrode 4 (FIG. 6 (a), FIG. 1 (a)).

Next, in an electrolytic solution containing Ni ions, the drain bus line 2 of the thin film transistor matrix device is formed.
By performing electrodeposition using 1 as a cathode and a Ni plate as an anode, the third metal film 16 made of Ni and having a thickness of 200 nm is electrodeposited only on the exposed portion of the drain bus line 21,
A third metal film 16 is formed on the first metal film 10 of the drain bus line 21 (FIGS. 6A and 6E).

Next, the first metal film 10 made of Cr is selectively etched using the third metal film 16 made of Ni as a mask. The first metal film 10 of the source electrode portion 1 and the pixel electrode portion 4 is removed by etching (FIG. 6).
(B)). Next, a film having a thickness of 3 is formed on the insulating substrate 40, the first metal film 10 and the third metal film 16 by the plasma CVD method.
Semiconductor film 6 made of 0 nm amorphous silicon (a-Si) and silicon nitride (SiN) having a film thickness of 400 nm
A gate insulating film 7 made of Cr is laminated, and a gate electrode film 8 made of Cr and having a film thickness of 200 nm is formed by a sputtering method (FIG. 6C).

Next, a resist is formed on the entire surface and patterned so as to remain on the region where the gate bus line including the gate electrode is to be formed to form a resist 15 (FIG. 6D). Next, the resist 15 is used as a mask to selectively remove the gate electrode film 8, the gate insulating film 7, and the semiconductor film 6 by etching (FIG. 6E).

Thus, the thin film transistor matrix device is completed. As described above, according to the manufacturing method of this embodiment, the drain bus line 21 is electrodeposited in the electrolytic solution to deposit a metal in the electrolytic solution.
The third metal film 16 can be selectively formed on the first metal film 10. Therefore, the third metal film 16
The third metal film 16 can be formed in a self-aligning manner by a simple manufacturing process without forming a resist for forming the. [Sixth Embodiment] A thin film transistor matrix device according to a sixth embodiment of the present invention will be described with reference to FIG. The same components as those of the fifth embodiment shown in FIG. 6 are designated by the same reference numerals to omit or simplify the description.

The plan view of the thin film transistor matrix device of the present embodiment is the same as that of FIG.
FIG. 6D is a process cross-sectional view showing a cross section taken along the line ll ′ of FIG. 1A in each manufacturing process, and FIG. 6E is a cross-sectional view taken along the line LL ′ of FIG. is there. First, regarding the structure of the thin film transistor matrix device of the present embodiment, FIG.
This will be described with reference to (a), FIG. 7 (d) and FIG. 6 (e).

As the drain bus line 21 vertically arranged on the insulating substrate 40, as shown in the sectional view taken along the line LL ′ of FIG. First metal film 10 and N having a film thickness of 200 nm
A third metal film 16 made of i is stacked. On the intersection with the gate bus line 31, the semiconductor film 6,
The gate insulating film 7 and the gate electrode film 8 are laminated. The first metal film 10 and the third metal film 16 are continuously formed over the entire drain bus line 21.

On the source electrode 1 of the thin film transistor,
As shown in FIG. 6D, the gate bus lines 31 in which the first metal film 10, the semiconductor film 6, the gate insulating film 7, and the gate electrode film 8 are laminated intersect with each other. On the other hand, the first metal film 10 is formed on the transparent conductive film 5 that connects the drain electrode 2, and the surface of the first metal film 10 is covered with the third metal film 16.

As described above, according to this embodiment, the first metal film 1 is continuously formed over the entire drain bus line 21.
Since 0 and the third metal film 16 are formed, the resistance value of the drain bus line 21 can be lowered. Next, a method of manufacturing the thin film transistor matrix device of this embodiment will be described with reference to FIG.

First, the transparent conductive film 5 and the first metal film 10 stacked on the insulating substrate 40 by the sputtering method are patterned to form the source electrode 1, the drain electrode 2, the drain bus line 21 and the pixel electrode 4. To do. Then, N
In the electrolytic solution containing i ions, the drain bus line 21 of the thin film transistor matrix device is used as a cathode, and the Ni plate is used as an anode to perform electrodeposition to form a third Ni-containing film.
The metal film 16 is electro-deposited only on the exposed portion of the drain bus line 21 to form the third metal film 16 on the first metal film 10 of the drain bus line 21 (FIG. 7A).
The steps up to this point are the same as in the fifth embodiment.

Next, a film is formed on the insulating substrate 40, the first metal film 10 and the third metal film 16 by a plasma CVD method without selectively etching the first metal film 10 made of Cr. 30 nm thick amorphous silicon (a-S
The semiconductor film 6 made of i) and the gate insulating film 7 made of silicon nitride (SiN) having a film thickness of 400 nm are laminated, and the gate electrode film 8 made of Cr having a film thickness of 200 nm is formed by the sputtering method (FIG. 7 (b)).

Next, a resist is formed on the entire surface and patterned so as to remain on the region where the gate bus line including the gate electrode is to be formed, thereby forming the resist 15 (FIG. 7C). Next, the resist 15 is used as a mask to selectively remove the gate electrode film 8, the gate insulating film 7, and the semiconductor film 6 by etching (FIG. 7C).

Next, the resist 15 and the third Ni layer made of Ni are used.
Using the metal film 16 as a mask, the first metal film 10 made of Cr is removed by etching (FIG. 7D). Thus, the thin film transistor matrix device is completed. As described above, according to the manufacturing method of the present embodiment, the first metal film 10 of the drain bus line 21 is electrodeposited by using the drain bus line 21 as a cathode in the electrolytic solution to electrodeposit metal.
The third metal film 16 can be selectively formed thereon. Therefore, the third metal film 16 can be formed in a self-aligned manner by a simple manufacturing process without forming a resist for forming the third metal film 16. [Modifications of First to Sixth Embodiments] In the first to sixth embodiments described above, the structure and manufacturing in which the a-Si film 6 is directly formed on the source electrode 1 and the drain electrode 2 which are the bases. Although the method has been described, from the viewpoint of the characteristics of the thin film transistor, the semiconductor film 6, the source electrode 1 and the drain electrode 2
Between the group 3 and group 5 impurities (such as phosphorus (P))
It is desirable to interpose a contact layer containing a high concentration of boron or boron (B).

For example, after the source electrode 1 and the drain electrode 2 are formed, a treatment is performed in a plasma containing PH ₃ gas, and then the a-Si film 6 is formed. Selectively to phosphorus (P)
A method of forming an n + a-Si layer containing a high concentration of is applicable. [Seventh Embodiment] A method of manufacturing a thin film transistor matrix device according to a seventh embodiment of the present invention will be described with reference to FIG.

First, the transparent conductive film 5 is formed on the entire surface of the insulating substrate 50.
2. The metal film 60 is sequentially laminated. Subsequently, a resist (not shown) is patterned to form a pixel electrode and a drain bus line, the transparent conductive film 52 and the metal film 60 are etched using this resist as a mask, and the pixel electrode 56 is formed.
And the drain bus line 58 is formed (FIG. 8A).
Next, as shown in FIG. 8A, a positive voltage is applied in an electrodeposition resist solution (Nippon Petrochemical Co., Ltd .: Oligo ED-UV) using the drain bus line 58 of the thin film transistor matrix device as an anode ( FIG. 8 (b2)). The resist 64 is electrodeposited only on the metal film 60 of the drain bus line 58 (FIG. 8 (b1)).

Next, using the electrodeposited resist 64 as a mask, the metal film 60 of the pixel electrode 56 is selectively removed by etching (FIG. 8C). After that, drain bus line 5
The resist 64 on 8 is removed. As described above, according to the manufacturing method of the present embodiment, the resist for masking the drain bus line portion is formed by electrodeposition in a self-aligned manner, so that it is not necessary to consider a margin for mask alignment, and the pixel electrode The aperture ratio can be increased by increasing the area of the portion. [Eighth Embodiment] A method of manufacturing a thin film transistor matrix device according to an eighth embodiment of the present invention will be described with reference to FIG. FIG. 9A is a plan view, and FIG.
(D) is a process sectional view showing a cross section taken along the line AA 'in each manufacturing process.

The present embodiment is a method of manufacturing a thin film transistor matrix device using a stagger type thin film transistor as an active element. A plurality of pixel electrodes 56 are arranged in a matrix on an insulating substrate 50 which is a glass substrate. As shown in FIG. 9A, a drain bus line 58 is vertically arranged and a gate bus line 66 is horizontally arranged between the pixel electrodes 56, and the drain bus line 58 and the gate bus line 66 are connected to each other. Thin film transistors (TFTs) 68 are arranged at intersecting positions.

A transparent conductive film 52 made of ITO and having a thickness of about 50 nm is formed on the insulating substrate 50 by, for example, a sputtering method.
A metal film 60 having a thickness of 50 nm is laminated. Next, the laminated metal film 60 and the transparent conductive film 52 are etched by a normal photolithography technique to form the pixel electrode 56 and the drain bus line 58 (FIG. 9B).

Next, an electrodeposition resist solution (manufactured by Nippon Petrochemical:
When a DC voltage of 5 V is applied for 20 seconds in the oligo ED-UV) using the drain bus line 58 of the thin film transistor matrix device as an anode, a resist 64 having a thickness of about 1 μm is selectively electrodeposited on the metal film 60 of the drain bus line 58. To do. After baking at about 80 ° C., the resist 64 is cured by irradiation with ultraviolet light (FIG. 9C).

Next, Cr is etched using the hardened resist 64 as a mask to selectively remove the metal film 60 on the pixel electrode 56 by etching to make the pixel electrode 56 transparent (FIG. 9C). )). Then, the resist 64 on the drain bus line 58 is removed. Next, P as an ohmic contact layer is formed by a plasma CVD method.
An approximately 30 nm thick a-Si layer 70 doped with (phosphorus)
It is selectively formed on the transparent conductive film 52 and the metal film 60. Next, by plasma CVD, an a-Si layer 72 having a thickness of about 50 nm, which is an operating semiconductor layer, and a silicon nitride layer 74 having a thickness of about 300 nm, which is a gate insulating layer, are formed on the entire surface. Subsequently, an aluminum layer 76 having a thickness of about 200 nm to be the gate bus line 66 is formed by the sputtering method.

Next, a resist (not shown) patterned in the shape of the gate bus line 66 is formed by a normal photolithography technique, and the aluminum layer 76, the silicon nitride layers 74, a are formed using this resist as a mask.
The -Si layer 72 and the a-Si layer 70 are sequentially removed by etching (FIG. 9D). Thus, the thin film transistor matrix device is completed.

As described above, according to the manufacturing method of this embodiment, since the resist for masking the drain bus line portion is electrodeposited and formed in a self-aligned manner, it is not necessary to consider a margin for mask alignment. It is possible to manufacture a thin film transistor matrix device using a staggered thin film transistor in which the area of the pixel electrode portion is increased and the aperture ratio is increased. [Ninth Embodiment] A method of manufacturing a thin film transistor matrix device according to a ninth embodiment of the present invention will be described with reference to FIG. The same components as those of the thin film transistor matrix device of the eighth embodiment shown in FIG. 9 are designated by the same reference numerals to omit or simplify the description. 10A is a plan view, and FIGS. 10B to 10D are A- in each manufacturing process.
It is a process sectional view showing an A'line section.

The present embodiment is a method of manufacturing a thin film transistor matrix device using an inverted stagger type thin film transistor as an active element. A plurality of pixel electrodes 56 are arranged in a matrix on an insulating substrate 50 which is a glass substrate. A drain bus line 58 is vertically arranged between the pixel electrodes 56, as shown in FIG.
A gate bus line 66 is arranged in the horizontal direction. The gate 66a projects from the gate bus line 66,
6a, the protruding portion of the drain bus line 58 and the pixel electrode 5
An inverted stagger type thin film transistor (TFT) is provided so as to face the projecting portion of 6.

First, an aluminum layer 78 having a thickness of about 100 nm and a titanium layer 80 having a thickness of about 50 nm are laminated on an insulating substrate 50 which is a glass substrate by a sputtering method, and a gate including a gate 66a is formed by an ordinary photolithography technique. The patterning is performed so as to have the shape of the bus line 66. Next, by a plasma CVD method, a silicon nitride layer 82 having a thickness of about 300 nm which is a gate insulating layer, an a-Si layer 84 having a thickness of about 100 nm which is a semiconductor operating layer, and a P-doped ohmic contact layer having a thickness of about 30 nm. a-S
The i layers 86 are successively stacked in order.

Next, the a-Si layer 84 and the a-Si layer 86 are patterned by a normal photolithography technique to isolate the a-Si layer 84, which is a semiconductor operating layer, from elements (FIG. 10A). . Next, a transparent conductive layer 52 made of ITO and having a thickness of about 150 nm and a metal film 60 made of Cr and having a thickness of about 150 nm are sequentially stacked by a sputtering method. Then, by a normal photolithography technique, patterning is performed so that the drain bus line 58 and the pixel electrode 56 are formed (FIG. 10C).

Next, the thin film transistor matrix device was subjected to electrodeposition resist solution (Nippon Petrochemical Co., Ltd .: Oligo ED-UV).
Then, a DC voltage of 5 V is applied for about 20 seconds with the drain bus line 58 as an anode. Drain bus line 58
A resist 88 having a thickness of about 1 μm is selectively electrodeposited on the metal film 60 of FIG. After baking at about 80 ° C., the resist 88 is cured by irradiation with ultraviolet light (FIG. 10C).

Next, by using the hardened resist 88 as a mask to etch Cr, the metal film 60 on the pixel electrode 56 is selectively removed by etching to make the pixel electrode 56 transparent (FIG. 10 (d). )). Then, the resist 88 on the drain bus line 58 is removed. In this way, the inverted stagger type thin film transistor matrix device is completed.

As described above, according to the manufacturing method of this embodiment, the resist for masking the drain bus line portion is formed by electrodeposition in a self-aligned manner, so that it is not necessary to consider a margin for mask alignment. It is possible to manufacture a thin film transistor matrix device using an inverted stagger type thin film transistor in which the area of the pixel electrode portion is increased and the aperture ratio is increased. [Tenth Embodiment] FIG. 1 shows a method of manufacturing a thin film transistor matrix device according to a tenth embodiment of the present invention.
This will be described using 1. The same components as those of the thin film transistor matrix device of the ninth embodiment shown in FIG. 10 are designated by the same reference numerals to omit or simplify the description. Figure 11
(A)-(d) is A of FIG. 10 (a) in each manufacturing process.
It is a process sectional view showing a section taken along a line A-A '.

The present embodiment is a method of manufacturing a thin film transistor matrix device using an inverted stagger type thin film transistor as an active element. The inverted stagger type thin film transistor of this embodiment is a so-called channel etching stopper type. Similar to the ninth embodiment, the patterned aluminum layer 78 and titanium layer 80 are formed on the insulating substrate 50 which is a glass substrate.
Then, by a plasma CVD method, a silicon nitride layer 82 which is a gate insulating layer and an a-Si layer 8 which is a semiconductor operation layer.
4. Channel etching stopper layer of about 100 nm
A thick silicon nitride layer 90 is continuously and sequentially laminated.

Next, a positive resist 92 is spin-coated on the silicon nitride layer 90. Then, by exposing the resist 92 from the back surface of the insulating substrate 50, the gate 6 is exposed.
The positive resist 92 is patterned in a self-aligned manner in the shape of the gate bus line 66 including 6a (FIG. 11).
(A)). Next, the silicon nitride layer 90 is over-etched with an etchant solution containing hydrofluoric acid using the resist 92 as a mask. The silicon nitride layer 90 is the resist 9
Side etching is performed from the two ends by about 0.5 to 1.0 μm. Then, using the resist 92 as a mask, reactive ion etching (RI) using BCl ₃ gas and Cl ₂ gas is performed.
The a-Si layer 84 is anisotropically etched by E) (FIG. 11B).

Next, after removing the resist 92, an approximately 30 nm thick a-Si layer 86 which is an ohmic contact layer and is a-Si layer 84 is formed by plasma CVD.
Selectively formed only on top. Then, by a sputtering method, a transparent conductive layer 52 of ITO having a thickness of about 100 nm,
A metal film 60 of Cr having a thickness of about 150 nm is sequentially stacked. Then, patterning is performed so that the drain bus line 58 and the pixel electrode 56 are formed by a normal photolithography technique (FIG. 11C).

Next, the thin film transistor matrix device was set in an electrodeposition resist solution (Nippon Petrochemical: Oligo ED-UV).
Then, a DC voltage of 5 V is applied for about 20 seconds with the drain bus line 58 as an anode. Drain bus line 58
A resist 88 having a thickness of about 1 μm is selectively electrodeposited on the metal film 60 of FIG. After baking at about 80 ° C., the resist 88 is cured by irradiation with ultraviolet light (FIG. 11 (d)).

Next, by using the hardened resist 88 as a mask to etch Cr, the metal film 60 on the pixel electrode 56 is selectively removed by etching to make the pixel electrode 56 transparent (FIG. 11 (d). )). Then, the resist 88 on the drain bus line 58 is removed. In this way, the inverted stagger type thin film transistor matrix device is completed.

As described above, according to the manufacturing method of this embodiment, the resist for masking the drain bus line portion is electrodeposited and formed in a self-aligned manner, so that it is not necessary to consider a margin for mask alignment. It is possible to manufacture a thin film transistor matrix device using an inverted stagger type thin film transistor (channel etching stopper type) in which the area of the pixel electrode portion is increased and the aperture ratio is increased. [Eleventh Embodiment] FIG. 1 shows a method of manufacturing a thin film transistor matrix device according to an eleventh embodiment of the present invention.
2 is used for the explanation. The same components as those of the thin film transistor matrix device of the ninth embodiment shown in FIG. 10 are designated by the same reference numerals to omit or simplify the description. 12
12A is a plan view, and FIGS. 12B to 12D are process cross-sectional views showing cross-sections along the line AA ′ in each manufacturing process.

The present embodiment is a method of manufacturing a thin film transistor matrix device using an inverted stagger type thin film transistor as an active element, and is characterized in that a resist is electrodeposited on a gate bus line. On the insulating substrate 50 which is a glass substrate, I
Forming a transparent conductive film 52 of TO having a thickness of about 50 nm,
Then, on the transparent conductive film 52, about 150 n of Cr is formed.
A metal film 60 having a thickness of m is stacked.

Next, the laminated metal film 60 and the transparent conductive film 52 are etched by a normal photolithography technique to form a gate bus line 66 including the pixel electrode 56 and the gate 66a (FIG. 12B). . Next, in an electrodeposition resist solution (Nippon Petrochemical: Oligo ED-UV), the gate bus line 66 of the thin film transistor matrix device is used.
Is used as an anode and a DC voltage of 5 V is applied for 20 seconds, a resist 94 having a thickness of about 1 μm is selectively electrodeposited on the metal film 60 of the gate bus line 66 including the gate 66a. About 80
After baking at C, the resist 94 is cured by irradiating with ultraviolet light (FIG. 12B).

Next, by using the hardened resist 94 as a mask to etch Cr, the metal film 60 on the pixel electrode 56 is selectively removed by etching to make the pixel electrode 56 transparent (FIG. 12B. )). After that, the resist 94 on the gate bus line 66 is removed. Next, a gate insulating layer of about 300 nm is formed by plasma CVD.
Thick silicon nitride layer 82, a semiconductor operating layer of about 100
The a-Si layer 84 having a thickness of nm and the P-doped a-Si layer 86 having a thickness of about 30 nm, which is an ohmic contact layer, are successively laminated in this order.

Next, the silicon nitride layer 82, the a-Si layer 84, and the a-Si layer 86 are patterned by a normal photolithography technique to form an a-Si semiconductor operating layer.
The layer 84 is separated into elements (FIG. 12C). Next, a metal film 96 of Mo having a thickness of about 300 nm is formed by a sputtering method.
To form. Then, by a normal photolithography technique, patterning is performed so that the drain bus line 58 and the source 98 are formed (FIG. 12D).

In this way, the inverted stagger type thin film transistor matrix device is completed. As described above, according to the manufacturing method of the present embodiment, the resist for masking the gate bus line is electrodeposited and formed in a self-aligned manner, so that it is not necessary to consider a margin for mask alignment, and the pixel electrode portion It is possible to manufacture a thin film transistor matrix device using an inverted stagger type thin film transistor in which the area is increased and the aperture ratio is increased. [Twelfth Embodiment] A method of manufacturing a thin film transistor matrix device according to a twelfth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. 13 is a plan view, FIG.
4 (a1), (b1), FIGS. 15 (a1), (b1) show cross-sections along the line AA ′ in each manufacturing process, and FIG.
2), (b2), FIG. 15 (a2), and (b2) are process cross-sectional views showing cross-sections along the line BB ′ in each manufacturing process.

This embodiment is a method of manufacturing a thin film transistor matrix device using a stagger type thin film transistor as an active element, and is characterized in that a resist is electrodeposited on a gate bus line. First, a metal film 100 of Cr having a thickness of about 150 nm is formed on the insulating substrate 50 which is a glass substrate by, for example, a sputtering method. Then, the metal film 100 is patterned so as to have the shapes of the drain bus line 58 and the source 98 by a normal photolithography method (FIG. 14A1).

Next, by a plasma CVD method, an ohmic contact layer of P-doped a having a thickness of about 30 nm is formed.
The -Si layer 101 is selectively deposited on the metal film 100 made of Cr (FIG. 14 (a1)). Next, plasma CVD
A-Si having a thickness of about 50 nm, which is a semiconductor operation layer, by
A layer 102 and a silicon nitride layer 104 having a thickness of about 300 nm, which is a gate insulating layer, are deposited, and subsequently, by a sputtering method,
Approximately 50 nm thick polycrystalline S doped with P for the gate layer
The i layer 106 is laminated (FIGS. 14A1 and 14A2).

Next, a negative resist 108 is spin-coated on the polycrystalline Si layer 106. Then, the gate 66a
The resist 108 is exposed from the front surface side of the insulating substrate 50 and the resist 108 is exposed from the rear surface side of the insulating substrate 50 by using the photomask 109 in which the portion of the gate bus line 66 including is opened. The resist 108 is patterned in a shape in which the portion having an overlapping width of 0.5 to 1 μm by the wraparound of the exposure light is thickened in a self-aligned manner with the shapes of the drain bus line 58 and the source 98 (FIG. 14A.
1) (a2)).

Next, the polycrystalline Si layer 106, the silicon nitride layer 104, the a-Si layer 102, and the a-Si layer 101 are etched using the resist 108 as a mask (FIG. 14).
(B1) (b2)). Next, by sputtering, ITO
A transparent conductive film 110 having a thickness of about 100 nm and a metal film 112 having a thickness of about 200 nm made of Mo are sequentially laminated. Then, the pixel electrode 5 is formed by an ordinary photolithography method.
6 and the gate bus line 66, the transparent conductive film 110 and the metal film 112 are patterned (FIG. 15 (a1),
(A2)).

Next, an electrodeposition resist solution (manufactured by Nippon Petrochemical:
In the oligo ED-UV), when the gate bus line 66 of the thin film transistor matrix device is used as an anode and a DC voltage of 5 V is applied for 20 seconds, the polycrystalline Si layer 106 and the metal film 112 of the gate bus line 66 including the gate 66a are selected. As a result, a resist 114 having a thickness of about 1 μm is electrodeposited. About 8
After baking at 0 ° C., ultraviolet light is irradiated to cure the resist 114 (FIGS. 15 (b1) and 15 (b2)).

Next, using the resist 114 as a mask, M
By etching o, the metal film 112 on the pixel electrode 56 is selectively removed by etching, and the metal film 112 on the pixel electrode 56 is removed.
Becomes transparent (FIGS. 15 (b1) and 15 (b2)). afterwards,
Resist 11 on polycrystalline Si layer 106 and metal film 112
Remove 4. Thus, the stagger type thin film transistor matrix device is completed.

As shown in FIG. 16, FIG.
In steps 1) and (a2), the drain bus line 5
The drain bus line 58 may be made to have a low resistance by leaving the transparent conductive film 110 and the metal film 112 also in FIG. At the time of electrodeposition of the resist, a DC voltage is also applied to the drain bus line 58 so that the metal film 112 of the drain bus line 58 is formed.
Also, the resist 114 is selectively electrodeposited. Resist 1
Mo is etched by using 14 as a mask to form the pixel electrode 5
The metal film 112 on 6 is selectively removed by etching. Since the laminated film of the transparent conductive film 110 and the metal film 112 is formed on the drain bus line 58 except the intersection with the gate bus line 66 to reduce the resistance, the metal film 1 made of Cr is formed.
00 can be made thin.

As described above, according to the manufacturing method of this embodiment, the resist for masking the gate bus line is electrodeposited to be formed in a self-aligned manner, so that it is not necessary to consider the margin for mask alignment. It is possible to manufacture a thin film transistor matrix device using a staggered thin film transistor in which the area of the pixel electrode portion is increased and the aperture ratio is increased. [Modifications of Seventh to Twelfth Embodiment] In the seventh to twelfth embodiments described above, after electrodeposition of the resist,
After baking and irradiation with ultraviolet light to cure the electrodeposition resist, as shown in FIG.
By irradiating the electrodeposition resist 124 with ultraviolet light using a mask 122 that shields the bus line terminal portion 120 and developing after irradiation with ultraviolet light, as shown in FIG. By removing the electrodeposition resist, the bus line terminal portion 120 can be made of only the transparent conductive film made of ITO. [Thirteenth Embodiment] A method of manufacturing a thin film transistor matrix device according to a thirteenth embodiment of the present invention will be described with reference to FIG.
And FIG. 20.

By using the electrodeposition resist as described in detail in the first to twelfth embodiments, the number of photomasks in the photolithography process can be reduced, the drain bus line resistance can be reduced, and the display electrodes can be reduced. The area of the pattern can be increased to increase the aperture ratio. However, a desired resist may not be formed depending on the electrodeposition conditions. Therefore, in this example, the optimum electrodeposition condition was specifically examined.

FIG. 18 shows the manufacturing process in which the electrodeposition conditions were examined in this example. This manufacturing process is a manufacturing process of the thin film transistor matrix device shown in FIG. FIG.
(A)-(d) is sectional drawing of the AA 'line of Fig.9 (a). First, by sputtering on the insulating substrate 130,
About 50 nm thick transparent conductive film 132 made of ITO, Cr
A metal film 134 having a thickness of about 100 nm is sequentially deposited (FIG. 18A).

Next, the laminated transparent conductive film 132 and the metal film 134 are etched by a normal photolithography technique to be patterned into the shapes of the pixel electrode 56 including the source electrode and the drain bus line 58 including the drain electrode. (FIG.18 (a)). Next, when the drain bus line 58 of the thin film transistor matrix device is used as an anode and a predetermined DC voltage is applied for a predetermined time in an electrodeposition resist solution (Nippon Petrochemical Co., Ltd .: Oligo ED-UV), metal of the drain bus line 58 is applied. Resist 1 selectively on film 134
36 is electrodeposited. After baking at a predetermined temperature, the resist 136 is cured by irradiation with ultraviolet light (FIG. 18).
(B)).

Next, by using the hardened resist 136 as a mask, the Cr is etched to form the pixel electrode 56.
The metal film 134 is selectively removed by etching to make the pixel electrode 56 transparent (FIG. 18B). Then, the resist 136 on the drain bus line 58 is removed. Then, an a-Si layer 138 having a thickness of about 30 nm and a silicon nitride layer 140 having a thickness of about 400 nm serving as a gate insulating layer are formed on the entire surface by plasma CVD, and subsequently, a sputtering method is used. Gate bus line 66
Then, a chromium layer 142 having a thickness of about 200 nm is deposited (FIG. 18C).

Next, a resist 144 patterned into the shape of the gate bus line 66 is formed by a normal photolithography technique, and the resist 144 is used as a mask to form the chromium layer 142, the silicon nitride layer 140, a-.
The Si layer 138 is sequentially removed by etching (FIG. 18).
(D)). Thus, the thin film transistor matrix device is completed.

In the above manufacturing method, the electrodeposition state of the resist 136 differs depending on the electrodeposition conditions. Various electrodeposition states are shown in FIGS. 19 (a) to 19 (c). When electrodeposition is performed under appropriate electrodeposition conditions, as shown in FIG. 19 (a), electrodeposition occurs only around the metal film 134 of the drain bus line 58, but depending on the electrodeposition conditions, as shown in FIG. 19 (b). Then, the resist 136 becomes thicker and also protrudes into the gate portion. Further, when the resist 136 becomes thicker, the protruding resist 136 reaches the pixel electrode 56 as shown in FIG. 19C. When this happens, the drain bus line 5
8 and the electrodeposition selectivity of the resist between the pixel electrode 56 and the metal electrode 134 of the pixel electrode 56 cannot be selectively etched.

In this example, among the electrodeposition conditions, the temperature of the electrodeposition resist solution, the electrodeposition voltage applied during electrodeposition, and the drying temperature after electrodeposition were examined. For example, when the thin film transistor matrix device is dipped in an electrodeposition resist solution maintained at a temperature of 15 ° C. and the electrodeposition voltage is 10 V, about 1 V is applied.
A thin resist with a thickness of ~ 2 μm was electrodeposited, and there was almost no protrusion of the resist from the energized drain bus line,
It was possible to improve the selectivity between the drain bus line and the pixel electrode.

The graph of FIG. 20A shows that the electrodeposition voltage is 10
It shows the ratio of the pixel electrode to which the resist is attached when the voltage is changed from V to 70V. The distance between the drain bus line and the pixel electrode was 5 μm. When the electrodeposition voltage is 70 V, the resist adheres to almost all the pixels, whereas when the electrodeposition voltage is 10 to 20 V, the ratio of the pixel electrodes to which the resist adheres is very small and good selectivity can be obtained. I found out that

Further, the temperature of the electrodeposition resist solution is 5 ° C. to 2 ° C.
It was found that by setting the temperature as low as 0 ° C., the resist electric resistance at the time of electrodeposition can be increased, and the film thickness of the resist to be electrodeposited can be reduced if the other electrodeposition conditions are the same. After electrodeposition, the resist is dried in an oven for about 5 minutes, but by performing it at a temperature lower than the normal drying temperature, the phenomenon (reflow) of the electrodeposited resist flowing out in the pattern side direction more than necessary is reduced. It was found that the wearing accuracy can be further improved.

The graph of FIG. 20B shows the reflow of the resist from the design pattern depending on the drying temperature of the resist when the electrodeposition resist solution was electrodeposited under the same conditions of 15 ° C. and the electrodeposition voltage of 15 V. It indicates the width. It was found that the reflow width can be reduced from 5 μm to 1 μm by lowering the resist drying temperature from 80 ° C. to 40 ° C.

According to this embodiment, when the electrodeposition resist is selectively electrodeposited on the fine electrode pattern in the thin film transistor matrix device, the electrodeposition voltage is lowered to 3 to 50 V to form the electrodeposition resist film. The thickness can be reduced, and accurate electrodeposition can be performed on the energization pattern. Further, by setting the temperature of the electrodeposition resist solution at the time of electrodeposition to 5 ° C. to 20 ° C., the resist resistance increases and the electrodeposition resist film thickness can be reduced. Furthermore, by lowering the drying temperature after electrodeposition to 40 ° C. to 75 ° C., the width of reflow of the resist from the energized pattern due to heat can be reduced.

[0127]

As described above, according to the present invention, the drain bus line resistance can be reduced, and the display quality does not deteriorate such as the occurrence of crosstalk in a large area display and the deterioration of contrast. A display device can be realized. In addition, since it becomes possible to manufacture with a high yield in a simple process, it is possible to realize a low-cost active matrix display device.

Further, according to the present invention, the resist for etching and removing the metal layer of the display electrode portion can be selectively formed only in the bus line portion in a self-aligning manner. The photolithography process that requires alignment can be reduced, and the manufacturing process can be simplified. In addition, since it is not necessary to consider the alignment margin when designing the pattern, the area of the display electrode pattern can be increased and the aperture ratio can be increased. Therefore, a bright display can be obtained by a simplified process, which can contribute to cost reduction and display quality improvement of the active matrix liquid crystal display.

[Brief description of drawings]

FIG. 1 is a diagram showing a thin film transistor matrix device according to a first embodiment of the present invention.

FIG. 2 is a process cross-sectional view of the method of manufacturing the thin film transistor matrix device according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a thin film transistor matrix device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a thin film transistor matrix device according to a third embodiment of the present invention.

FIG. 5 is a diagram showing a thin film transistor matrix device according to a fourth embodiment of the present invention.

FIG. 6 is a view showing a thin film transistor matrix device according to a fifth embodiment of the present invention.

FIG. 7 is a diagram showing a thin film transistor matrix device according to a sixth embodiment of the present invention.

FIG. 8 is a diagram showing a method of manufacturing a thin film transistor matrix device according to a seventh embodiment of the present invention.

FIG. 9 is a diagram showing a method of manufacturing a thin film transistor matrix device according to an eighth embodiment of the present invention.

FIG. 10 is a diagram showing a method of manufacturing a thin film transistor matrix device according to a ninth embodiment of the present invention.

FIG. 11 is a diagram showing a method of manufacturing a thin film transistor matrix device according to a tenth embodiment of the present invention.

FIG. 12 is a diagram showing a method of manufacturing a thin film transistor matrix device according to an eleventh embodiment of the present invention.

FIG. 13 is a view (No. 1) showing the method of manufacturing the thin film transistor matrix device according to the twelfth embodiment of the present invention.

FIG. 14 is a view (No. 2) showing the method of manufacturing the thin film transistor matrix device according to the twelfth embodiment of the present invention.

FIG. 15 is a view (No. 3) showing the method of manufacturing the thin film transistor matrix device according to the twelfth embodiment of the present invention.

FIG. 16 is a view (No. 4) showing the method of manufacturing the thin film transistor matrix device according to the twelfth embodiment of the present invention.

FIG. 17 is an explanatory diagram of modified examples of the seventh to twelfth embodiments of the present invention.

FIG. 18 is a diagram showing a method for manufacturing a thin film transistor matrix device according to a thirteenth embodiment of the present invention.

FIG. 19 is a view showing various electrodeposition states of a thin film transistor matrix device according to a thirteenth embodiment of the present invention.

FIG. 20 is a graph showing an electrodeposition state according to electrodeposition conditions of a thin film transistor matrix device according to a thirteenth embodiment of the present invention.

FIG. 21 is a diagram showing a conventional thin film transistor matrix device.

FIG. 22 is a diagram showing a conventional thin film transistor matrix device.

FIG. 23 is a diagram showing a method of manufacturing a conventional thin film transistor matrix device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Source electrode 2 ... Drain electrode 3 ... Gate electrode 4 ... Pixel electrode 5 ... Transparent conductive film 6 ... Semiconductor film 7 ... Gate insulating film 8 ... Gate electrode film 10, 10a, 10b ... 1st metal film 11 ... 2nd Metal film 12 ... Anodic oxide film 13 ... Resin film 15 ... Resist 16 ... Third metal film 21 ... Drain bus lines 23, 23a, 23b ... Intersection 31, 31a, 31b ... Gate bus line 40 ... Insulating substrate 50 ... Insulating substrate 52 ... Transparent conductive film 54 ... First resist 56 ... Pixel electrode 58 ... Drain bus line 60 ... Metal film 62 ... Second resist 64 ... Electrodeposition resist 66 ... Gate bus line 66a ... Gate 68 ... Thin film transistor (TFT) ) 70 ... a-Si layer 72 ... a-Si layer 74 ... silicon nitride layer 76 ... aluminum layer 78 ... aluminum layer 80 ... titanium layer 2 ... Silicon nitride layer 84 ... a-Si layer 86 ... a-Si layer 88 ... Electrodeposition resist 90 ... Silicon nitride layer 92 ... Positive resist 94 ... Electrodeposition resist 96 ... Metal film 98 ... Source 100 ... Metal film 101 ... a-Si layer 102 ... a-Si layer 104 ... Silicon nitride layer 106 ... Polycrystalline Si layer 108 ... Negative resist 109 ... Photomask 110 ... Transparent conductive film 112 ... Metal film 114 ... Electrodeposition resist 120 ... Bus line terminal portion 122 ... Mask 124 ... Electrodeposition resist 130 ... Insulating substrate 132 ... Transparent conductive film 134 ... Metal film 136 ... Electrodeposition resist 138 ... a-Si layer 140 ... Silicon nitride layer 142 ... Chromium layer 144 ... Resist

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Ogata 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Limited (72) Inventor, Yutaka Takizawa 1015, Kamitadanaka, Nakahara-ku, Kawasaki, Kanagawa Prefecture Fujitsu Limited (72) Inventor Masahiro Okabe 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Limited

Claims (21)

[Claims] 1. An insulating substrate, a plurality of pixel electrodes arranged in a matrix on the insulating substrate, a plurality of thin film transistors having a source electrode connected to each pixel electrode, and a first electrode between the pixel electrodes. A drain bus line that is wired in a direction and that commonly connects the drain electrodes of the thin film transistors, and a second bus line that is orthogonal to the first direction between the pixel electrodes.
Is crossed with the drain bus line in the direction of
In a thin film transistor matrix device having a gate bus line commonly connecting gate electrodes of the thin film transistors, a first metal film formed on the drain bus line at an intersection intersecting with the gate bus line, and the gate bus line 2. A thin film transistor matrix device, comprising: a second metal film formed on the drain bus line between intersections intersecting with each other and connecting the first metal film. 2. The thin film transistor matrix device according to claim 1, wherein the surface of the second metal film is covered with a protective film made of a resin or an oxide. 3. The thin film transistor matrix device according to claim 1, wherein the surfaces of the second metal film and the gate bus line are covered with the same protective film made of resin or oxide. Thin film transistor matrix device. 4. An insulating substrate, a plurality of pixel electrodes arranged in a matrix on the insulating substrate, a plurality of thin film transistors having a source electrode connected to each pixel electrode, and a first electrode between the pixel electrodes. A drain bus line that is wired in a direction and that commonly connects the drain electrodes of the thin film transistors, and a second bus line that is orthogonal to the first direction between the pixel electrodes.
Is crossed with the drain bus line in the direction of
A method of manufacturing a thin film transistor matrix device having a gate bus line commonly connecting gate electrodes of the thin film transistors, wherein a transparent conductive film and a metal film are laminated on the insulating substrate, and the transparent conductive film and the metal film are at least the drain. Patterning into a shape including a bus line or the gate bus line and the pixel electrode; and energizing the drain bus line or the gate bus line in an electrolytic solution to form the drain bus line or the gate bus line. Forming a film only in a pattern electrically connected to the drain bus line or the gate bus line; and electrically connecting to the drain bus line or the gate bus line and the drain bus line or the gate bus line Only shaped patterns Method of manufacturing a thin film transistor matrix device characterized by a step of etching away the metal film on the pixel electrode membrane as a mask is. 5. The method of manufacturing a thin film transistor matrix device according to claim 4, wherein the drain bus line or the gate bus line and a pattern electrically connected to the drain bus line or the gate bus line are formed. A method for manufacturing a thin film transistor matrix device, wherein the film is an electrodeposited resin film or an electrodeposited resist film. 6. The method of manufacturing a thin film transistor matrix device according to claim 4, wherein the drain bus line or the gate bus line and a pattern electrically connected to the drain bus line or the gate bus line are formed. A method of manufacturing a thin film transistor matrix device, wherein the film is an anodized film of the metal film. 7. The method of manufacturing a thin film transistor matrix device according to claim 4, wherein the drain bus line or the gate bus line and a pattern electrically connected to the drain bus line or the gate bus line are formed. The method of manufacturing a thin film transistor matrix device, wherein the film is an electrodeposited metal film. 8. An insulating substrate, a plurality of pixel electrodes arranged in a matrix on the insulating substrate, a plurality of thin film transistors having a source electrode connected to each pixel electrode, and a first electrode between the pixel electrodes. A drain bus line that is wired in a direction and that commonly connects the drain electrodes of the thin film transistors, and a second bus line that is orthogonal to the first direction between the pixel electrodes.
Is crossed with the drain bus line in the direction of
A method of manufacturing a thin film transistor matrix device having a gate bus line commonly connecting gate electrodes of the thin film transistors, wherein a transparent conductive film is formed on the insulating substrate, and the transparent conductive film is formed on the pixel electrode and the source of the thin film transistor. Electrode and drain electrode, patterning into the shape of the drain bus line, and electrifying the drain bus line in an electrolytic solution to selectively deposit a metal film on the surface of the transparent conductive film of the drain bus line. And a step of laminating a semiconductor layer, a gate insulating layer and a gate electrode layer, and patterning the semiconductor layer, the gate insulating layer and the gate electrode layer into a shape of the gate bus line intersecting with the drain bus line, Exposing the transparent conductive film of the pixel electrode. Method of manufacturing a thin film transistor matrix device according to claim. 9. An insulating substrate, a plurality of pixel electrodes arranged in a matrix on the insulating substrate, a plurality of thin film transistors having a source electrode connected to each pixel electrode, and a first electrode between the pixel electrodes. A drain bus line that is wired in a direction and that commonly connects the drain electrodes of the thin film transistors, and a second bus line that is orthogonal to the first direction between the pixel electrodes.
Is crossed with the drain bus line in the direction of
A method of manufacturing a thin film transistor matrix device having a gate bus line commonly connecting gate electrodes of the thin film transistors, wherein a transparent conductive film and a first metal film are formed on the insulating substrate,
The transparent conductive film and the first metal film, the pixel electrode,
Patterning the source and drain electrodes of the thin film transistor and the shape of the drain bus line; and selecting the first metal film surface of the drain bus line by energizing the drain bus line in an electrolytic solution. Electrically depositing a protective film, and using the electrodeposited protective film as a mask to etch away the first metal film on the pixel electrode to expose the transparent conductive film, a semiconductor layer, A gate insulating layer and a gate electrode layer are laminated, and the semiconductor layer, the gate insulating layer, and the gate electrode layer are patterned into a shape of the gate bus line intersecting with the drain bus line, and the transparent conductive film of the pixel electrode is formed. The method of manufacturing a thin film transistor matrix device, comprising: 10. The method of manufacturing a thin film transistor matrix device according to claim 9, wherein the protective film is an electrodeposited second metal film. 11. The method of manufacturing a thin film transistor matrix device according to claim 9, wherein the protective film is an electrodeposited resist. 12. An insulating substrate, a plurality of pixel electrodes arranged in a matrix on the insulating substrate, and a plurality of thin film transistors having a source electrode connected to each of the pixel electrodes,
A drain bus line that is wired between the pixel electrodes in a first direction and commonly connects the drain electrodes of the thin film transistors, and a drain bus line between the pixel electrodes in a second direction orthogonal to the first direction. A method of manufacturing a thin film transistor matrix device, comprising: a gate bus line that intersects and is commonly connected to the gate electrodes of the thin film transistors; forming a transparent conductive film and a first metal film on the insulating substrate;
The transparent conductive film and the first metal film, the pixel electrode,
Patterning the source and drain electrodes of the thin film transistor and the shape of the drain bus line; and selecting the first metal film surface of the drain bus line by energizing the drain bus line in an electrolytic solution. Electrodepositing a second metal film, and stacking a semiconductor layer, a gate insulating layer, and a gate electrode layer, and crossing the semiconductor layer, the gate insulating layer, and the gate electrode layer with the drain bus line. Patterning into the shape of a bus line, and exposing the transparent conductive film by selectively etching away the first metal film on the pixel electrode using the gate electrode layer of the gate bus line as a mask A method of manufacturing a thin film transistor matrix device, comprising: 13. The method of manufacturing a thin film transistor matrix device according to claim 4, wherein when the drain bus line is energized in an electric field solution, the gate bus line is also energized. Matrix device manufacturing method. 14. An insulating substrate, a plurality of pixel electrodes arranged in a matrix on the insulating substrate, and a plurality of thin film transistors in which a source electrode is connected to each of the pixel electrodes,
A drain bus line that is wired between the pixel electrodes in a first direction and commonly connects the drain electrodes of the thin film transistors, and a drain bus line between the pixel electrodes in a second direction orthogonal to the first direction. A method of manufacturing a thin film transistor matrix device, comprising: a gate bus line that is wired to intersect and commonly connects gate electrodes of the thin film transistors; a step of forming the gate bus line on the insulating substrate; and a gate insulating layer and a semiconductor layer. And patterning the semiconductor layer into the shape of the thin film transistor to separate elements, forming a transparent conductive film and a first metal film, and forming the transparent conductive film and the first metal film into the pixel. Electrodes, the source and drain electrodes of the thin film transistor, and the drain bus line. And a step of selectively electrodepositing a resist on the surface of the first metal film of the drain bus line by energizing the drain bus line in an electrolytic solution, using the resist as a mask, And a step of selectively removing the first metal film on the pixel electrode by etching to expose the transparent conductive film. 15. An insulating substrate, a plurality of pixel electrodes arranged in a matrix on the insulating substrate, and a plurality of thin film transistors having a source electrode connected to each pixel electrode,
A drain bus line that is wired between the pixel electrodes in a first direction and commonly connects the drain electrodes of the thin film transistors, and a drain bus line between the pixel electrodes in a second direction orthogonal to the first direction. A method of manufacturing a thin film transistor matrix device, comprising: a gate bus line that intersects and is commonly connected to the gate electrodes of the thin film transistors; forming a transparent conductive film and a first metal film on the insulating substrate;
Patterning the transparent conductive film and the first metal film into the shapes of the pixel electrode, the gate electrode of the thin film transistor, and the gate bus line; and energizing the gate bus line in an electrolytic solution. A step of selectively electrodepositing a resist on the surface of the first metal film of the gate bus line, and selecting the first metal on the pixel electrode using the selectively electrodeposited resist as a mask A step of selectively removing the transparent conductive film by etching, a step of stacking a gate insulating layer and a semiconductor layer, and patterning the gate insulating film and the semiconductor layer in the shape of the thin film transistor to separate elements; Forming a second metal film, and then patterning the second metal film so as to have the shapes of the drain bus line and the source electrode. A method of manufacturing a thin film transistor matrix device, comprising: 16. An insulating substrate, a plurality of pixel electrodes arranged in a matrix on the insulating substrate, and a plurality of thin film transistors having a source electrode connected to each pixel electrode,
A drain bus line that is wired between the pixel electrodes in a first direction and commonly connects the drain electrodes of the thin film transistors, and a drain bus line between the pixel electrodes in a second direction orthogonal to the first direction. A method of manufacturing a thin film transistor matrix device, comprising: a gate bus line which is wired to intersect and which commonly connects gate electrodes of the thin film transistors, wherein a first metal film is formed on the insulating substrate, and the first metal film is formed. Patterning the drain bus line and the shape of the drain electrode and the source electrode of the thin film transistor, stacking a semiconductor layer, a gate insulating layer and a gate electrode layer, and forming the semiconductor layer, the gate insulating layer and the gate electrode layer, Patterning the shape of the gate bus line and the gate electrode; Forming a second metal film and patterning the transparent conductive film and the second metal film into the shape of the pixel electrode and the gate bus line; and energizing the gate bus line in an electrolytic solution. Selectively depositing a resist on the surface of the second metal film of the gate bus line and the surface of the gate electrode by using the resist as a mask to selectively deposit the second metal film on the pixel electrode. And a step of exposing the transparent conductive film by etching to expose the transparent conductive film. 17. The method of manufacturing a thin film transistor matrix device according to claim 16, wherein the transparent conductive film and the second metal film are patterned into a shape including the drain bus line, and the gate bus line in an electric field solution. When energizing
A method of manufacturing a thin film transistor matrix device, wherein the drain bus line is also energized to selectively electrodeposit the resist on the surface of the second metal film of the drain bus line. 18. The method according to claim 7, 11, 13, 14, 15,
16. The method of manufacturing a thin film transistor matrix device according to any one of 16 and 17, wherein the electrodeposited resist is irradiated with ultraviolet rays while shielding the bus line terminal portion of the drain bus line or the gate bus line, and developed. Sometimes, the resist on the bus line terminal portion is removed, and the second metal film on the bus line terminal portion is also selectively etched away by using the resist as a mask to expose the transparent conductive film. A method of manufacturing a thin film transistor matrix device, comprising: 19. The method according to claim 11, 13, 14, 15, or 1.
19. The method of manufacturing a thin film transistor matrix device according to any one of 6, 17, or 18, wherein the electrodeposition voltage for electrodeposition of the resist is within the range of about 3V to 50V. . 20. The method of manufacturing a thin film transistor matrix device according to claim 19, wherein the electrodeposited resist is dried within a range of about 40 ° C. to 75 ° C. 21. The method of manufacturing a thin film transistor matrix device according to claim 19, wherein the temperature of the electric field solution during electrodeposition is within a range of about 5 ° C. to 20 ° C. Production method.