JPH1073847A - Production of liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a driving circuit part and to improve reliability by providing a counter substrate opposite to a display area and a driving circuit area. SOLUTION: A counter substrate 11 in an enough size to cover the driving circuit part of the substrate to face each other is prepared by applying ITO as a counter electrode in a display area or on the whole surface. A sealing agent 14 is applied by screen printing to separately surround the display area 12 and the driving circuit area 13. The sealing agent 14 to surround the display area 12 has an injection port 15 for a liquid crystal. As for the sealing agent 14 to surround the driving circuit area 13, it is not necessary to wholly surround the driving circuit. After a spacer is distributed on the display area of the substrate 10, the substrate 10 is laminated with the counter substrate 11 and irradiated with UV rays to harden the sealing agent. Then the body of the laminated substrates is subjected to a reduced pressure state to inject and seal a liquid crystal material 16 in the display area 12. The obtd. liquid crystal display device has the display area 12 and the driving circuit area 13 formed on the same substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

2. Description of the Related Art Conventionally, in a liquid crystal display device, in particular, an active matrix type liquid crystal display device in which active elements such as thin film transistors are provided in each pixel to form a matrix, each substrate has an active element connected to each pixel. There is known a so-called monolithic configuration in which a drive circuit for controlling a signal applied to a pixel is also provided integrally. The drive circuit is usually formed by forming the amorphous silicon thin film transistor of the display part constituting the matrix at the same time as forming the same, and then performing crystallization only by laser irradiation or the like to transform the drive circuit portion into a crystallized silicon thin film transistor. I was

In an apparatus having this configuration, as shown in FIG. 1, an opposing substrate 2 opposing a substrate 1 on which a driving circuit is formed.
Exists only on the display area 5 where the liquid crystal material 3 exists, and the drive circuit portion 6 is only covered with the resin 7 or the like.
Nothing was devised.

[0003]

However, in such a conventional configuration, when an external force or the like is applied to the drive circuit portion, the drive circuit is easily broken, which causes a failure.

[0004]

SUMMARY OF THE INVENTION The present invention
In a liquid crystal display device having a display portion and a drive circuit portion on the same substrate, a structure for protecting the drive circuit portion and improving reliability is provided.

[0005]

In order to solve the above-mentioned problems, the present invention has a display area and a drive circuit area on which a drive circuit for controlling display of the display area is formed on the same substrate, A liquid crystal display device having a display substrate and a drive circuit region separated by a sealant, a counter substrate facing the substrate, and a liquid crystal material between the substrates, wherein the counter substrate has the display region and the drive A liquid crystal display device, which is provided so as to face a circuit region.

Further, the present invention has a display area and a drive circuit area on which a drive circuit for controlling display of the display area is formed on the same substrate, and the display area and the drive circuit area are formed by a sealant. A partitioned, opposing substrate facing the substrate, and a liquid crystal display device having a liquid crystal material between the substrates, wherein the opposing substrate is opposed to the display region and the drive circuit region, A liquid crystal display device characterized in that at least a part of the periphery of the drive circuit region has a sealant.

Further, according to the present invention, a display area and a drive circuit area on which a drive circuit for controlling display of the display area are formed are formed on the same substrate, and the display area and the drive circuit area are sealed with a sealant. A partitioned, opposing substrate facing the substrate, and a liquid crystal display device having a liquid crystal material between the substrates, wherein the opposing substrate is opposed to the display region and the drive circuit region, A liquid crystal display device characterized in that at least a space between the counter substrate and the drive circuit region is filled with a resin material.

Further, according to the present invention, a display region and a drive circuit region on which a drive circuit for controlling display of the display region are formed are formed on the same substrate, and the display region and the drive circuit region are sealed with a sealant. A partitioned, opposing substrate facing the substrate, and a liquid crystal display device having a liquid crystal material between the substrates, wherein the opposing substrate is opposed to the display region and the drive circuit region, At least a part of the periphery of the drive circuit region is surrounded by a sealant, and a resin material is filled in the surrounded region and between the counter substrate and the drive circuit region. Is a liquid crystal display device.

Further, according to the present invention, in the liquid crystal display device having the above structure, a driving circuit is formed in a region of the opposing substrate opposite to the driving circuit region.

[0010]

According to the liquid crystal display device of the present invention, in a liquid crystal display device having a display region and a drive circuit region in which a drive circuit for controlling display in the display region is formed on the same substrate, even in a portion opposed to the drive circuit region The counter substrate is provided, which can protect the drive circuit, and can be a device resistant to external pressure and impact.

Further, by filling a resin material between at least the drive circuit region and the opposing substrate, intrusion of moisture and the like can be prevented, and the reliability of the device can be improved.

Further, another drive circuit or the like may be provided in a region of the counter substrate facing the drive circuit region, thereby increasing the drive circuit region without increasing the substrate area as a multilayer substrate-like structure. Can be done.

[0013]

【Example】

Embodiment 1 As shown in FIG. 2A, an amorphous silicon TFT is formed in a display area 12 on a Corning 7059 glass substrate 10, and laser irradiation is performed on the amorphous silicon TFT in a drive circuit area 13. To form a crystalline silicon TFT that has been laser-crystallized, and if necessary, SiN, SiO ₂ , PSG (phosphosilicate glass),
A drive circuit was formed by covering with a passivation film such as BSG (borosilicate glass) or polyimide. Display area 12
In this case, a pixel electrode and the like are formed thereafter, and 640 × 48
A matrix of 0 was constructed.

Next, a sealant 14 is formed on an opposing substrate 11 having ITO (indium tin oxide) as an opposing electrode, which is formed over the display area or over the entire surface, and which is large enough to cover the driving circuit of the opposing substrate. Here, an ultraviolet curable resin is screen-printed so as to separately surround the display region 12 and the drive circuit region 13 as shown in FIG. At this time, the sealant surrounding the display area is the liquid crystal injection port 1
5 is formed in advance. Further, the sealant surrounding the drive circuit area does not have to surround the entire periphery of the drive circuit. It is not necessary to provide only the display area in the drive circuit area. Further, a spacer may be contained in the sealant.

After the spacers were scattered on the display area of the substrate 10, the substrate 10 and the opposing substrate 11 were adhered to each other and irradiated with ultraviolet rays to be cured.

Thereafter, the whole of the bonded substrates was put in a reduced pressure state, and a liquid crystal material 16 was injected into the display region and sealed.

FIG. 3 shows the liquid crystal display device thus formed. This device is a conventional liquid crystal display device in which a display area and a drive circuit are formed on the same substrate, and has a structure in which a drive circuit is covered only with resin or the like without a glass substrate facing the drive circuit. In comparison, it was extremely strong against external pressure, and was able to prevent destruction of the drive circuit and sufficiently protect it. The manufacturing process is also very easy.

[Embodiment 2] Formed in the same manner as in Embodiment 1,
In a substrate 10 having a display area and a driving circuit, and a counter substrate 11 on which a counter electrode is formed, a sealant 14, here, an ultraviolet-curing resin, is applied on the counter substrate 11, and FIG.
The screen printing is performed so as to surround the display area 12 as shown in FIG. The sealant may contain a spacer. At this time, the liquid crystal injection port 15 is formed.

A resin material 17 such as an ultraviolet curable resin or an epoxy resin is filled in a portion facing the drive circuit region 13 so that at least the drive circuit region is sufficiently filled when the substrate 10 and the counter substrate 11 are bonded to each other. Screen printing or potting. The same material as the sealant may be used. The sealing agent and resin are not on the counter substrate side,
It may be provided on the substrate side having the display area and the drive circuit.

After the spacers are scattered on the display area of the substrate 10, the substrate 10 and the opposing substrate 11 are adhered to each other, and the sealant and the resin on the drive circuit are cured.

Thereafter, the whole of the bonded substrates was evacuated to a vacuum state, and a liquid crystal material 16 was injected into the display region and sealed.

The liquid crystal display device of FIG. 4B formed in this manner can protect the drive circuit against an external pressure as in the first embodiment, and also protects the drive circuit portion from moisture and the like. Intrusion has been sufficiently prevented, and high reliability has been achieved.

[Embodiment 3] Formed in the same manner as in Embodiment 1,
In a substrate 10 having a display region and a driving circuit and a counter substrate on which a counter electrode is formed, an ultraviolet-curing resin is used as a sealant 14 on the counter substrate 11 as shown in FIG.
As shown in (A), a liquid crystal injection port 15 is formed, and screen printing is performed so as to surround the opposing display area 12. The sealing agent may contain a spacer.

After the spacers are scattered on the display area of the substrate 10, the substrate 10 and the opposing substrate 11 are adhered to each other, and the sealant is cured.

Thereafter, the whole of the bonded substrates was evacuated to fill the display region with a liquid crystal material 16, which was then sealed.

Next, a resin material (in this case, an ultraviolet curable type) is placed on the portion between the two substrates under a reduced pressure of about 0.01 to 10 torr, and when the resin material is subjected to normal pressure or pressure resistance, the resin material surrounds the sealing material. And the resin material 17 is filled between the substrates in the drive circuit region 13. Thereafter, the resin was cured by irradiation with ultraviolet rays.

When the sizes of the two substrates are the same, the resin can be placed on the side surfaces of the two substrates, thereby facilitating the production.
The liquid crystal material may be injected after filling and curing of the resin.

The liquid crystal display device thus formed as shown in FIG. 5B has high reliability by sufficiently preventing invasion of moisture and the like as in the second embodiment.

Example 4 A film was formed in the same manner as in Example 1,
In a substrate 10 having a display region and a driving circuit and a counter substrate on which a counter electrode is formed, an ultraviolet curing resin is used as a sealant 14 on the counter substrate 11 as shown in FIG. Screen printing was performed to form the inlet 18. A spacer may be mixed with the sealant.

After the spacers are scattered on the display area of the substrate 10, the substrate 10 and the opposing substrate 11 are adhered to each other, and the sealant is cured.

Thereafter, the whole of the bonded substrates is
The liquid crystal material 16 was injected into the display area under a reduced pressure of about 10 torr, and the resin material 17 (here, ultraviolet curing type) was injected into the area surrounding the drive circuit from the injection ports 15 and 18. The injection may be performed simultaneously, but may be performed separately so that the liquid crystal material and the resin do not evaporate and mix. When the pressure is set to the normal pressure or the pressurized state, respectively, the resin material 17 enters the region surrounded by the sealing material and is filled between the substrates in the drive circuit portion. Thereafter, the resin was cured by irradiation with ultraviolet rays.

The liquid crystal display device thus formed as shown in FIG. 6B has high reliability by sufficiently preventing invasion of moisture and the like, similarly to the second and third embodiments. Above, the fabrication became extremely easy.

In these embodiments, the drive circuit may be formed not only on one substrate but also on upper and lower substrates. In that case, silver paste, a conductive spacer, or the like may be used to electrically connect the drive circuits of the upper and lower substrates. Further, the liquid crystal material may be any material such as nematic or smectic. In the drawings of the embodiments, the substrates 10 and 11 are drawn in the same size, but the size of both substrates is arbitrary as long as the opposing substrate also exists in the drive circuit area. When the substrate 10 is enlarged, connection of the electrodes becomes easy.

In this embodiment, an active matrix drive type device using a thin film transistor as a display area is described. However, the present invention is applicable to a device using a non-linear element such as an MIM diode, a simple matrix drive type device, and the like. Is valid.

[0035]

According to the present invention, in a liquid crystal display device having a display area and a drive circuit area on which a drive circuit for controlling display is formed on the same substrate, the drive circuit can be protected from external pressure and the like. Was. Furthermore, when the upper and lower substrates are stuck together and cut with a scriber to take multiple LCD panels from a large area substrate,
The drive circuit could be protected from the impact of the scriber and the yield could be improved.

Further, by filling a resin material between the drive circuit region and the opposing substrate, the invasion of moisture and the like can be prevented, and the reliability of the device can be improved.

Further, by providing another drive circuit or the like in a region of the opposing substrate facing the drive circuit region, it is possible to increase the drive circuit region without increasing the substrate area as a multilayer substrate-like structure. did it.

[Brief description of the drawings]

FIG. 1 shows a conventional liquid crystal display device.

FIG. 2 shows an embodiment of the liquid crystal display device of the present invention.

FIG. 3 shows an embodiment of the liquid crystal display device of the present invention.

FIG. 4 shows an embodiment of the liquid crystal display device of the present invention.

FIG. 5 shows an embodiment of the liquid crystal display device of the present invention.

FIG. 6 shows an embodiment of the liquid crystal display device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Counter substrate 3 Liquid crystal material 4 Sealant 5 Display area 6 Drive circuit 7 Resin 10 Substrate 11 Counter substrate 12 Display area 13 Drive circuit 14 Seal agent 15 Liquid crystal injection port 16 Liquid crystal material 17 Resin material 18 Resin injection port

Claims (2)

[Claims] When a plurality of liquid crystal panels are formed by cutting a first substrate and a second substrate bonded together with a sealant therebetween, the first substrate is used as the second substrate. And a driving circuit region having a size corresponding to a display region provided in the device and a driving circuit region in which a driving circuit for controlling the display region is formed. A first substrate having a display region, a drive circuit region having a drive circuit for controlling the display region, and at least opposing the display region and the drive circuit region of the first substrate. A step of bonding a second substrate having a size with a sealant, and a step of cutting the first and second substrates to form a panel after the step. A method for manufacturing a liquid crystal display device.