KR20070067502A - Organic electro-luminescence display device and fabricating method thereof - Google Patents

Abstract

An organic electro-luminescence display device and a manufacturing method thereof are provided to reduce the distortion of a displayed image by reducing a step difference between spacers in an array region and a seal-line region. An organic electro-luminescence display device includes a TFT(Thin Film Transistor) array board(121), an EL(Electro-Luminescence) cell array board(101), and a spacer(150). A driving TFT is formed on an array region on a lower substrate. The EL cell array board is arranged to face the TFT array board. An EL cell having anode and cathode electrodes is formed on the EL cell array board. The spacer is formed on the EL cell array board such that a gap between the TFT array board and the EL cell array board is maintained. An insulation film, which insulates the anode and cathode electrodes of the EL cell from outside, is arranged under the spacer.

Description

Organic electroluminescent display device and manufacturing method therefor {ORGANIC ELECTRO-LUMINESCENCE DISPLAY DEVICE AND FABRICATING METHOD THEREOF}

1 is an equivalent circuit diagram of a general organic electroluminescent display.

FIG. 2 is a cross-sectional view illustrating an array area of the organic light emitting display device illustrated in FIG. 1.

3 is a diagram illustrating a spacer of an array region and a seal line region of an upper array substrate of a conventional organic electroluminescent display.

4A and 4B are diagrams illustrating a step between a spacer in an array region and a spacer in a seal line region and a curved organic electroluminescence display device.

5 is a cross-sectional view illustrating an organic light emitting display device according to an exemplary embodiment of the present invention.

6 is a cross-sectional view illustrating a spacer of an array region and a spacer of an array region of an upper array substrate of an organic light emitting display device according to a first exemplary embodiment of the present invention.

7A through 7E are cross-sectional views illustrating a method of manufacturing an upper array substrate of an organic light emitting display device according to a first exemplary embodiment of the present invention.

8A through 8C are cross-sectional views illustrating a part of a method of manufacturing an upper array substrate of an organic light emitting display device according to a first exemplary embodiment of the present invention.

9 is a cross-sectional view illustrating a spacer of an array region and a spacer of an array region of an upper array substrate of an organic light emitting display device according to a second exemplary embodiment of the present invention.

10 is a cross-sectional view illustrating a spacer of an array region and a spacer of an array region of an upper array substrate of an organic light emitting display device according to a third exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1, 101: upper array substrate 2, 102: upper substrate

4, 104: anode electrode 5, 105: bus electrode

6, 106 insulation film 8, 108 partition wall

10, 110: organic light emitting layer 12, 112: cathode electrode

21, 121: lower array substrate 22, 122: lower substrate

24, 124: gate electrode 26, 126: source electrode

28, 128: drain electrode 30, 130: protective film

32, 132: contact electrode 34, 134: drain contact hole

36, 136: gate insulating film 50, 150: spacer

60: sub pixel 62: cell driver

144: dummy transparent electrode 145: dummy opaque electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic light emitting display device and a method of manufacturing the same. In particular, an organic light emitting display device capable of reducing image quality deterioration of an organic EL display device by reducing a step difference between a spacer in a seal line region and a spacer in an array region; It relates to a manufacturing method.

Recently, various flat panel display devices have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such a flat panel display device may be a liquid crystal display device (hereinafter referred to as "LCD"), a field emission display device (FED), or a plasma display panel (hereinafter referred to as "PDP"). And organic electroluminescence (hereinafter, referred to as “EL”) display elements.

Among them, PDP is attracting attention as a display device which is light and small and is most advantageous for large screen because of its simple structure and manufacturing process. However, PDP has low luminous efficiency, low luminance and high power consumption. On the other hand, an active matrix LCD having a thin film transistor (hereinafter, referred to as “TFT”) as a switching element has a disadvantage in that large screens are difficult to use due to the semiconductor process and power consumption is large due to the backlight unit. In addition, the LCD has a large optical loss and a narrow viewing angle due to optical elements such as a polarizing filter, a prism sheet, and a diffusion plate.

In contrast, the EL display device is classified into an inorganic EL display device and an organic EL display device according to the material of the light emitting layer. The EL display device is a self-luminous device that emits light by itself. In comparison with the organic EL display device, the inorganic EL display device has higher power consumption and cannot obtain high luminance, and cannot emit various colors of R (Red), G (Green), and B (Blue). On the other hand, the organic EL display device is driven at a low DC voltage of several tens of volts, has a fast response speed, obtains high luminance, and emits various colors of R, G, and B, which is suitable for next-generation flat panel display devices. .

As shown in FIG. 1, the organic EL display device includes subpixels 60 arranged in regions defined by intersections of the gate line GL and the data line DL. When the gate pulse is supplied to the gate line GL, the sub pixel 60 receives a data signal from the data line DL and emits light with light corresponding to the data signal to display an image.

To this end, the sub-pixel 60 is connected to the EL cell OEL having the anode electrode connected to the supply voltage source VDD, the gate line GL, the data line DL, and the base voltage source GND, And a cell driver 62 connected to the cathode electrode of the OEL. The cell driver 62 includes a switching TFT (T1), a driving TFT (T2), and a capacitor (C).

The switching TFT T1 is turned on when the gate pulse is supplied to the gate line GL, and supplies the data signal supplied to the data line DL to the node N. The data signal supplied to the node N is charged to the capacitor C and supplied to the gate terminal of the driving TFT T2. The driving TFT T2 controls the amount of light emitted from the EL cell OEL by controlling the amount of current I supplied from the supply voltage source VDD to the EL cell OEL in response to the data signal supplied to the gate terminal. . Since the data signal charged in the capacitor C is discharged even when the switching TFT T1 is turned off, the driving TFT T1 is supplied with a supply voltage source until the data signal of the next frame is supplied. The current I from VDD is supplied to the EL cell OEL so that the EL cell OEL maintains light emission.

FIG. 2 is a cross-sectional view illustrating in detail a sub-pixel illustrated in FIG. 1.

Referring to Fig. 2, an organic EL display element includes an upper array substrate 1 on which an EL cell is formed, a lower array substrate 21 on which a driving TFT (T2, see Fig. 1) for driving an EL cell is formed; And a spacer 50 for connecting the cathode electrode 12 of the EL cell and the drain electrode 28 of the driving TFT.

The upper array substrate 1 includes an EL cell including an anode electrode 4 and a cathode electrode 12 having an organic light emitting layer 10 formed thereon on the upper substrate 2 and insulated by an insulating film 6; A partition wall 8 for separating the EL cell and a bus electrode 5 for compensating for the high resistance of the anode electrode 4 are provided. A spacer 50 for connecting the cathode electrode 12 of the upper array substrate 1 to the drain electrode 28 of the driving TFT of the lower array substrate 21 is provided.

In the upper array substrate 1, the anode electrode 4 is formed by depositing a transparent conductive material such as indium tin oxide (ITO) on the upper substrate 2. The anode electrode 4 is supplied with a drive signal for releasing holes from the drive voltage source VDD (see Fig. 1).

The bus electrode 5 is formed to expose a region where the organic light emitting layer 10 is to be formed after the metal material of molybdenum (Mo) or chromium (Cr) is deposited on the upper substrate 2. The bus electrode 5 is connected with the anode electrode 4 to compensate for the high resistance of the anode electrode 4.

The cathode electrode 12 is formed in the EL cell region separated by the partition wall 8. The cathode electrode 12 is supplied with a driving signal for emitting electrons through the driving TFT. At this time, the cathode electrode 12 is formed to surround the space 50 and is connected to the drain electrode 28 of the driving TFT of the lower array substrate 21.

The partition 8 is formed to separate adjacent EL cells to separate the organic light emitting layer 10 and the cathode electrode 12.

The organic light emitting layer 10 is formed by stacking a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron injection layer. When the driving signal is supplied to the anode electrode 4 and the cathode electrode 12, the organic emission layer 10 generates visible light by recombination of holes and electrons emitted from the anode electrode 4 and the cathode electrode 12 in the emission layer. do. At this time, the generated visible light comes out through the anode electrode 4, which is a transparent electrode, so that the organic EL display element displays a predetermined image or image.

The spacer 50 is formed on the upper substrate 2 overlapping with the drain electrode 28 of the driving TFT of the lower array substrate 21 so that the drain electrode 28 and the EL of the driving TFT of the lower array substrate 21 are formed. The cathode electrode 12 of the cell is connected, and the anode electrode 4, the bus electrode 5, and the insulating film 6 are positioned under the spacer 50.

The lower array substrate 21 includes a switching TFT (T1 (see FIG. 1)) and a driving TFT to which the gate electrode 24 is connected to the drain electrode of the switching TFT.

In the lower array substrate 21, the gate electrode of the switching TFT is connected with the gate line, the source electrode is connected with the data line, and the drain electrode is connected with the gate electrode 24 of the driving TFT.

The gate electrode 24 of the driving TFT is formed on the lower substrate 22 together with the gate line, and the semiconductor layer 38 overlapping the gate electrode 24 of the driving TFT with the gate insulating film 36 interposed therebetween. And a source electrode 26 and a drain electrode 28 of the driving TFT formed with the data line with the semiconductor layer 38 therebetween. The source electrode 26 of the driving TFT is connected to the ground voltage source GND (see FIG. 1), and the drain electrode 28 of the driving TFT is connected to the cathode electrode 12 of the upper array substrate 1. At this time, the drain electrode 28 of the driving TFT is the cathode electrode of the upper array substrate 1 through the contact electrode 32 exposed on the protective film 30 through the drain contact hole 34 penetrating the protective film 30. It is connected with (12).

On the other hand, the spacer 50 has a uniformity of the cell gap (Gap) of the upper array substrate 1 and the lower array substrate 21 in the seal line region in order to bond the upper array substrate 1 and the lower array substrate 21. It is formed to secure.

However, as shown in FIG. 3, the bus electrode 5 and the anode electrode 4 are not formed below the spacer 50b formed in the seal line region, and only the insulating film 6 is positioned. Therefore, the spacer 50b of the seal line region and the spacer 50a of the array region are formed on the anode electrode 4 and the bus electrode 5 and the cathode electrode 12 formed to surround the spacer 50a of the array region. As a result, the upper array substrate 1 and the lower array substrate 21 are not in contact with each other in the seal line region as shown in FIG. 4A.

Then, the inside of the organic EL display element bonded by the sealant is in a vacuum state and is subjected to pressure from the outside, wherein the organic EL display element has a pressure that acts more strongly than the array region on the seal line region adjacent to the outside, and It is bent as shown in FIG. 4B by the step D1 between the spacer 50b of the seal line region and the spacer 50a of the array region. Accordingly, in the organic EL display device, a contact failure region A in which the spacer 50a of the array region and the lower array substrate 21 are separated is generated. By this contact failure region A, the control signal is not supplied to the cathode electrode 12 of the EL cell from the drain electrode 28 of the driving TFT. As a result, dark spots occur in the organic EL display device, and the organic EL display device has a disadvantage in that its image quality is degraded.

Accordingly, it is an object of the present invention to provide an organic EL display device and a method of manufacturing the same, which can reduce the deterioration in image quality of an organic EL display device by reducing the step difference between the spacer in the seal line region and the spacer in the array region.

In order to achieve the above object, the organic light emitting display device according to an embodiment of the present invention includes a thin film transistor array substrate formed with a driving thin film transistor in the array region on the lower substrate; An electroluminescent cell comprising an anode electrode and a cathode electrode formed in an array region on an upper substrate, the electroluminescent cell array substrate facing the thin film transistor array substrate; A spacer formed on the electroluminescent cell array substrate to maintain a gap between the thin film transistor array substrate and the electroluminescent cell array substrate, and an anode electrode and a cathode electrode of the electroluminescent cell beneath the spacer; Only an insulating film for insulating the film is located.

The electroluminescent cell array substrate includes: an anode having an opening in a region corresponding to a region where the spacer is formed in an array region on the upper substrate; An insulating film exposing a region where an organic light emitting layer is to be formed on the anode electrode; Barrier ribs separating a cell region on which the red, green, and blue organic light emitting layers are to be formed; A red, green, and blue organic light emitting layer formed on the cell region separated by the partition wall; And a cathode electrode formed on the organic light emitting layer.

The electroluminescent cell array substrate further includes a bus electrode that is removed from a region where the spacer is formed in the array region on the upper substrate and exposes a region where the organic emission layer is to be formed.

The cathode electrode of the electroluminescent cell is formed to surround the spacer formed in the array region and is connected to the drain electrode of the driving thin film transistor.

The electroluminescent cell array substrate further includes a dummy transparent electrode formed of the same material as the anode electrode in a seal line region surrounding an outer portion of the array region, wherein the dummy transparent electrode is disposed under a spacer formed in the seal line region. Only formed.

The electroluminescent cell array substrate further includes a dummy opaque electrode formed of the same material as the bus electrode in a seal line region surrounding the array region, wherein the dummy opaque electrode is disposed under a spacer formed in the seal line region. Only formed.

The thin film transistor array substrate may include: a gate line and a data line crossing each other; And a switching thin film transistor having a gate electrode connected to the gate line, a source electrode connected to the data line, and a drain electrode connected to the gate electrode of the driving thin film transistor.

An organic light emitting display device according to an embodiment of the present invention comprises the steps of: preparing a thin film transistor array substrate having a driving thin film transistor in the array region on the lower substrate; Providing an electroluminescent cell array substrate having an electroluminescent cell and a spacer for maintaining a gap with the thin film transistor array substrate in an array region on an upper substrate; And bonding the thin film transistor array substrate to the electroluminescent cell array substrate so as to face each other, wherein only an insulating layer is disposed below the spacer to insulate the anode electrode and the cathode electrode of the electroluminescent cell.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 5 to 10.

5 is a cross-sectional view illustrating an organic EL display device according to an exemplary embodiment of the present invention.

Referring to FIG. 5, an organic EL display device according to an exemplary embodiment of the present invention includes an upper array substrate 101 on which an EL cell is formed, and a driving TFT (T2, see FIG. 1) for driving an EL cell. The lower array substrate 121, and a spacer 150 for connecting the cathode electrode 112 of the EL cell and the drain electrode 128 of the driving TFT are provided.

The upper array substrate 1 includes an EL cell including an anode electrode 4 and a cathode electrode 12 having an organic light emitting layer 10 formed thereon on the upper substrate 2 and insulated by an insulating film 6; A partition wall 108 for separation of the EL cell and a bus electrode 105 for compensating for the high resistance of the anode electrode 104 are provided. A spacer 150 for connecting the cathode electrode 112 of the upper array substrate 101 and the drain electrode 128 of the driving TFT of the lower array substrate 121 is provided.

The upper array substrate 101 has the anode electrode 104 and the cathode electrode 112 formed between the organic light emitting layer 110 on the upper substrate 102 and insulated by the insulating film 106, and separation of the EL cell. And a bus electrode 105 for compensating for the high resistance of the anode electrode 104 under the anode electrode 104. The organic EL display device of the present invention includes a spacer 150 for connecting the cathode electrode 112 of the upper array substrate 101 and the drain electrode 128 of the driving TFT of the lower array substrate 121. .

In the upper array substrate 101, the anode electrode 104 is formed by depositing a transparent conductive material such as indium tin oxide (ITO) on the upper substrate 102. The anode electrode 104 is supplied with a drive signal for releasing holes from the supply voltage source VDD (see FIG. 1).

The bus electrode 105 is formed to expose a region where the organic light emitting layer 110 is to be formed after the metal material of molybdenum (Mo) or chromium (Cr) is deposited on the upper substrate 102. The bus electrode 105 is connected with the anode electrode 104 to compensate for the high resistance of the anode electrode 104.

The cathode electrode 112 is formed in the EL cell region separated by the partition wall 108. The cathode electrode 112 is supplied with a driving signal for emitting electrons through the driving TFT. At this time, the cathode electrode 112 is formed to surround the space 150 and is connected to the drain electrode 128 of the driving TFT of the lower array substrate 121.

The partition wall 108 is formed to separate adjacent EL cells to separate the organic light emitting layer 110 and the cathode electrode 112.

The organic light emitting layer 110 is formed by stacking a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron injection layer. When the driving signal is supplied to the anode electrode 104 and the cathode electrode 112, the organic emission layer 110 generates visible light by recombination of holes and electrons emitted from the anode electrode 104 and the cathode electrode 112 in the emission layer. do. At this time, the generated visible light comes out through the anode electrode 104, which is a transparent electrode, so that the organic EL display element displays a predetermined image or image.

The spacer 150 is formed on the upper substrate 102 overlapping with the drain electrode 128 of the driving TFT of the lower array substrate 121 to form a drain electrode 128 and an EL of the driving TFT of the lower array substrate 121. The cathode electrode 112 of the cell is connected.

Here, the anode electrode 104 and the bus electrode 105 are not formed below the spacer 150 according to the present invention. That is, only the insulating layer 106 is positioned under the spacer 150.

The lower array substrate 121 includes a switching TFT (T1 (see Fig. 1)) and a driving TFT having a gate electrode 124 connected to a drain electrode of the switching TFT.

In the lower array substrate 121, the gate electrode of the switching TFT is connected with the gate line, the source electrode is connected with the data line, and the drain electrode is connected with the gate electrode 124 of the driving TFT.

The gate electrode 124 of the driving TFT is formed on the lower substrate 122 together with the gate line, and the semiconductor layer 138 overlapping the gate electrode 124 of the driving TFT with the gate insulating layer 136 interposed therebetween. And a source electrode 126 and a drain electrode 128 of the driving TFT which are formed together with the data lines with the semiconductor layer 138 interposed therebetween. The source electrode 126 of the driving TFT is connected to the ground voltage source GND (see Fig. 1), and the drain electrode 128 of the driving TFT is connected to the cathode electrode 112 of the EL cell. At this time, the drain electrode 128 of the driving TFT is a cathode electrode of the upper array substrate 101 through the contact electrode 132 exposed on the passivation layer 130 through the contact hole 134 penetrating the passivation layer 130. 112).

As described above, in the organic EL display device according to the exemplary embodiment, only the insulating layer 106 is formed under the spacer 150a formed in the array region, thereby forming the spacer 150b formed in the seal line region as shown in FIG. 6. It is possible to reduce the step D2 between and.

Therefore, in the organic EL display device of the present invention, even if the seal line region adjacent to the outside is subjected to a stronger pressure than the array region, the organic EL display element is reduced as the level difference between the spacer 150a of the array region and the spacer 150b of the seal line region is reduced. The degree of warpage of the display element can be reduced.

Accordingly, the contact failure region (see “A” in FIG. 4B) where the spacer 150a of the array region and the lower array substrate 121 are spaced apart may be reduced, and the organic EL display may be reduced by reducing dark spots caused by the contact failure region A. FIG. The deterioration of the image quality of the device can be reduced.

Hereinafter, a method of manufacturing an organic EL display device according to an exemplary embodiment of the present invention will be described with reference to FIGS. 7A to 8C.

Referring to FIG. 7A, in the method of manufacturing an organic EL display device according to an exemplary embodiment of the present invention, a metal material of any one of molybdenum (Mo) or chromium (Cr) is deposited on the upper substrate 102 and then patterned. The electrode 105 is formed. In this case, the bus electrode 105 is not formed in the region B corresponding to the region where the spacer 150 is to be formed in the array region on the upper substrate 102 as shown in FIG. 8A.

Subsequently, a transparent conductive material such as ITO is deposited on the upper substrate 102 and then patterned to form the anode electrode 104. In this case, the anode electrode 104 is not formed in the region B corresponding to the region where the spacer 150 is to be formed in the array region on the upper substrate 102 as shown in FIG. 8B.

Then, an insulating material is entirely coated on the upper substrate 102 and then patterned to form an insulating film 106 exposing the region where the organic light emitting layer 110 is to be formed on the anode electrode 104 as shown in FIG. 7C. In this case, the insulating layer 106 is also formed in the region B and the seal line region corresponding to the region where the spacer 150 is to be formed in the array region as shown in FIG. 8C.

Subsequently, the barrier rib 108 is formed by coating the barrier material on the upper substrate 102 on which the insulating film 106 is formed, and then patterning the barrier rib 108. The spacers 150a and 150b are formed as shown in FIG. 7D. Is formed.

In addition, an organic light emitting material is deposited on the upper substrate 102 on which the barrier ribs 108 and the spacers 150a and 150b are formed by using a mask to form the organic light emitting layer 110. The cathode electrode 112 is subsequently connected to FIGS. 7E. As formed through full surface deposition of the electrode material. At this time, the cathode electrode 112 is formed to surround the space 150, so that the cathode electrode 112 is driven to drive the lower array substrate 121 after the bonding process of the upper array substrate 101 and the lower array substrate 121. It is connected to the drain electrode 128 of the TFT for.

9 is a cross-sectional view illustrating a spacer of an array region and a spacer of an array line region of an upper array substrate of an organic EL display device according to a second exemplary embodiment of the present invention.

Referring to FIG. 9, the organic EL display device according to the second exemplary embodiment of the present invention has an anode electrode 104 in the array region below the spacer 150b formed in the seal line region as compared with the first exemplary embodiment of the present invention. ) Is further provided with a dummy transparent electrode 144 formed in the same process.

Therefore, the organic EL display device according to the second embodiment of the present invention is an array area by the cathode electrode 112 formed on the spacer 150a of the array area in the organic EL display device according to the first embodiment of the present invention. The step (see “D2” in FIG. 6) between the spacer 150a and the spacer 150b in the seal line region can be further reduced.

Accordingly, in the organic EL display device according to the second embodiment of the present invention, even if the seal line region adjacent to the outside is subjected to a stronger pressure than the array region, the organic EL display device according to the second exemplary embodiment of the present invention has the spacer 150a of the array region and the spacer 150b of the seal line region. As the step is further reduced, the degree of bending of the organic EL display element can be further reduced by the step of the spacers 150a and 150b. As a result, the organic EL display device according to the second embodiment of the present invention can further reduce the deterioration in image quality.

10 is a cross-sectional view illustrating a spacer of an array region and a spacer of an array line region of an upper array substrate of an organic EL display device according to a third exemplary embodiment of the present invention.

Referring to FIG. 10, the organic EL display device according to the third exemplary embodiment of the present invention has a bus electrode 105 in the array region below the spacer 150b formed in the seal line region as compared with the first exemplary embodiment of the present invention. ) Is further provided with a dummy opaque electrode 145 formed in the same process.

Therefore, the organic EL display device according to the third exemplary embodiment of the present invention has the spacer 150a of the array region formed by the cathode electrode 112 formed on the spacer 150a of the array region, as in the second exemplary embodiment of the present invention. And the step (see “D2” in FIG. 6) between the spacer 150b formed in the seal line region can be further reduced.

Accordingly, in the organic EL display device according to the third exemplary embodiment, even if the seal line region adjacent to the outside is subjected to a stronger pressure than the array region, the organic EL display device according to the third exemplary embodiment of the present invention may be applied to the spacer 150a of the array region and the spacer 150b of the seal line region. As the step is further reduced, the degree of bending of the organic EL display element can be further reduced by the step of the spacers 150a and 150b. As a result, the organic EL display device according to the third embodiment of the present invention can further reduce the deterioration in image quality.

As described above, the organic EL display device and the method of manufacturing the same according to the embodiment of the present invention can reduce the step difference with the spacer formed in the seal line region by forming only an insulating film under the spacer formed in the array region. Therefore, even if the seal line region adjacent to the outside is subjected to a stronger pressure than the array region, the degree of warpage of the organic EL display element can be reduced as the level difference between the spacer of the array region and the spacer of the seal line region is reduced.

Accordingly, the organic EL display device according to the exemplary embodiment of the present invention can reduce the contact failure region where the spacers of the array region and the lower array substrate are separated, and reduce the image quality of the organic EL display device by reducing the dark spots caused by the contact failure region. Can be reduced.

In addition, the organic EL display device and the method of manufacturing the same according to another embodiment of the present invention further includes a dummy transparent electrode or a dummy opaque electrode under the spacer formed in the seal line region. Therefore, the step difference between the spacer in the array region and the spacer formed in the seal line region by the cathode electrode formed on the spacer in the array region can be further reduced.

Accordingly, in the organic EL display device according to another exemplary embodiment of the present invention, even when the seal line region adjacent to the outside is subjected to a stronger pressure than the array region, the array of spacers in the array region and the spacer in the seal line region is further reduced. The degree of warpage of the organic EL display element due to the step between the spacers in the region and the seal line region can be further reduced. As a result, the organic EL display device of the present invention can further reduce the deterioration in image quality.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (14)

A thin film transistor array substrate having a driving thin film transistor formed in the array region on the lower substrate; An electroluminescent cell comprising an anode electrode and a cathode electrode formed in an array region on an upper substrate, the electroluminescent cell array substrate facing the thin film transistor array substrate; A spacer formed on the electroluminescent cell array substrate to maintain a gap between the thin film transistor array substrate and the electroluminescent cell array substrate; And only an insulating layer disposed below the spacer to insulate the anode electrode and the cathode electrode of the electroluminescent cell. The method of claim 1, The electroluminescent cell array substrate, An anode having an opening in a region corresponding to the region where the spacer is formed in the array region on the upper substrate; An insulating film exposing a region where an organic light emitting layer is to be formed on the anode electrode; Barrier ribs separating a cell region on which the red, green, and blue organic light emitting layers are to be formed; A red, green, and blue organic light emitting layer formed on the cell region separated by the partition wall; And a cathode electrode formed on the organic light emitting layer. The method of claim 2, The electroluminescent cell array substrate, And a bus electrode which is removed from a region where the spacer is formed and exposes a region where an organic light emitting layer is to be formed in the array region on the upper substrate. The method of claim 1, And a cathode electrode of the electroluminescent cell is formed to surround a spacer formed in the array region and is connected to a drain electrode of the driving thin film transistor. The method of claim 2, The electroluminescent cell array substrate, Further comprising a dummy transparent electrode formed of the same material as the anode electrode in the seal line region surrounding the outside of the array region, The dummy transparent electrode is formed only under the spacer formed in the seal line region. The method of claim 3, wherein The electroluminescent cell array substrate, Further comprising a dummy opaque electrode formed of the same material as the bus electrode in the seal line region surrounding the outside of the array region, The dummy opaque electrode is formed only under the spacer formed in the seal line region. The method of claim 1, The thin film transistor array substrate, A gate line and a data line crossing each other; And a switching thin film transistor having a gate electrode connected to the gate line, a source electrode connected to the data line, and a drain electrode connected to the gate electrode of the driving thin film transistor. . Providing a thin film transistor array substrate on which a driving thin film transistor is formed in an array region on a lower substrate; Providing an electroluminescent cell array substrate having an electroluminescent cell and a spacer for maintaining a gap with the thin film transistor array substrate in an array region on an upper substrate; Bonding the thin film transistor array substrate to the electroluminescent cell array substrate to face each other; And only an insulating layer below the spacer to insulate the anode electrode and the cathode electrode of the electroluminescent cell. The method of claim 8, Preparing the electroluminescent cell array substrate, Forming an anode electrode having an opening in an area corresponding to an area where the spacer is formed in an array area on the upper substrate; Forming an insulating film on the anode to expose a region where the organic light emitting layer is to be formed; Forming a partition wall on the insulating layer to separate a cell region in which a red, green, and blue organic light emitting layer is to be formed; Forming a red, green, and blue organic light emitting layer formed in the cell region separated by the partition wall; And forming a cathode electrode formed on the organic light emitting layer. The method of claim 9, Preparing the electroluminescent cell array substrate, And forming a bus electrode in the array region on the upper substrate, the bus electrode being removed from the region where the spacer is formed and exposing the region where the organic light emitting layer is to be formed. The method of claim 8, The cathode of the electroluminescent cell is formed so as to surround a spacer formed in the array region and is connected to the drain electrode of the driving thin film transistor. The method of claim 8, Preparing the electroluminescent cell array substrate, Forming a dummy transparent electrode formed of the same material as the anode electrode in a seal line region surrounding an outer portion of the array region, The dummy transparent electrode is formed only under the spacer formed in the seal line region. The method of claim 10, Preparing the electroluminescent cell array substrate, Forming a dummy opaque electrode formed of the same material as the bus electrode in a seal line region surrounding the array region; And the dummy opaque electrode is formed only under the spacer formed in the seal line region. The method of claim 8, Preparing the thin film transistor array substrate, Forming a gate line and a gate electrode connected to the gate line; Forming a switching thin film transistor having a data line crossing the gate line, the gate electrode, a source electrode connected to the data line, and a drain electrode connected to a gate electrode of the driving thin film transistor; A method of manufacturing an organic light emitting display device, characterized in that.

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