KR100692844B1 - Organic Electro Luminescence Display and Fabricating Method Thereof - Google Patents

Abstract

The present invention relates to an organic electroluminescent display device and a method for manufacturing the same, which can increase luminous efficiency and reduce image quality deterioration.

An organic electroluminescent display device having a display area and a non-display area, the organic electroluminescent display device comprising: a data line and a scan line formed in a direction crossing each other on the display area; A data link extending from the data line formed in the non-display area and a scan link connected to the scan line; A data pad extended at a width wider than the width of the data link at the end of the data link formed in the non-display area and a scan pad extended at a width wider than the width of the scan link at the end of the scan link; The data link, the data pad, the scan link, and the scan pad may be formed of a plurality of conductive layers including a transparent conductive layer.

Description

Organic electroluminescent display and manufacturing method thereof {Organic Electro Luminescence Display and Fabricating Method Thereof}             

1 is a plan view schematically illustrating a lower substrate of a conventional organic electroluminescent display.

2 is a plan view schematically illustrating a lower substrate of another conventional organic electroluminescent display.

FIG. 3 is a cross-sectional view of the lower substrate of FIG. 2 taken along lines II ′ and II-II ′. FIG.

4 is a plan view schematically illustrating a lower substrate of an organic light emitting display device according to an exemplary embodiment of the present invention.

5 is a plan view illustrating a portion of a lower substrate of an organic electroluminescent display of the present invention.

6 is a cross-sectional view of the lower substrate of FIG. 5 taken along lines III-III 'and IV-IV'.

FIG. 7 is a cross-sectional view of the lower substrate of FIG. 4 taken along the line VV ′ and a cross-sectional view of a region C. FIG.

8A through 8D are cross-sectional views illustrating a method of manufacturing an organic light emitting display device according to the present invention.

<< Explanation of symbols for main parts of drawings

2, 52: substrate 14, 64: transparent conductive layer

56 insulating film 16 metal layer

66: first metal layer 68: aluminum layer

70: second metal layer 72: contact hole

24, 74: data pad portion 32, 82: scan pad portion

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic electroluminescent display, and more particularly, to an organic electroluminescent display and a method of manufacturing the same, which can increase luminous efficiency and reduce image quality.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such a flat panel display includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), and an electroluminescence (hereinafter, "EL"). Display).

PDP is most advantageous for large area because of its relatively simple structure and manufacturing process, but it has the disadvantages of low luminous efficiency, low luminance and high power consumption. LCD is mainly used as a display device of notebook computers, but the demand is increasing, but it is difficult to make a large area and power consumption is large due to the backlight unit. In addition, LCDs have disadvantages of high light loss and a narrow viewing angle due to optical display devices such as polarizing filters, prism sheets, and diffusion plates. In contrast, the EL display device is roughly classified into an inorganic EL and an organic EL, and has advantages of fast response speed and high luminous efficiency, luminance, and viewing angle. In addition, the organic EL display can display an image with high luminance of tens of thousands [cd / m 2] at a voltage of about 10 [V].

1 is a plan view schematically showing a lower substrate of a conventional organic EL display device.

Referring to FIG. 1, a conventional organic EL display device includes a data line DL and a scan line SL that cross each other, and EL cells (not shown) arranged in a matrix type at each intersection thereof to form an organic light emitting diode. It has a display area A in which an image is implemented.

In addition, a data link DK in which the data line DL of the display area A is extended, and a data pad DP having a width wider than the width of the data link DK is formed at the end of the data link DK. A scan having a data pad part 24 and having a scan link SK connected to the scan line SL and a scan pad SP having a width wider than that of the scan link SK at an end of the scan link. The non-display area B in which the pad part 32 is positioned is provided.

The data pad unit 24 and the scan pad unit 32 include a TCP (Tape Carrier Package) (not shown) mounted with a data driver (not shown) for generating a data signal and a scan driver (not shown) for generating a scan signal. Connected with.

The data pad unit 24 supplies a data signal supplied from the data driver to the data line DL to the corresponding data line DL through each data pad DP and the data link DK, and scan pad unit 32. ) Supplies a scan signal supplied from the scan driver to the scan line SL to the corresponding scan line SL through each scan pad SP and the scan link SK.

2 is a plan view schematically showing a lower substrate of another conventional organic EL display device.

The organic EL display device shown in FIG. 2 includes a data pad part 24 and first and second scan pad parts 32a and 32b as compared to FIG. 1, and includes first and second display devices for directing the display device. The second scan pad portions 32a and 32b are separated on both sides of the data pad portion 24 and are formed together under the substrate (not shown) of the organic EL display device.

The reason why the data pad portion 24 and the first and second scan pad portions 32a and 32b are formed together on the lower side of the substrate of the organic EL display device is that the organic EL display device is produced when the display units are directly manufactured. This is for the display area A to be positioned at the center of the display device.

Referring to FIG. 2, each data link DK extending from the data line DL of the display area A is connected to the lower portion of the data pad part 24 formed under the substrate 2 via the non-display area B. As shown in FIG. Scan links SKa and SKb connected to the corresponding data pad DP and connected to the scan line SL of the display area A are formed under the substrate 2 via the non-display area B. FIG. The pads 32a and 32b are connected to the corresponding scan pads SPa and SPb, respectively.

FIG. 3 is a cross-sectional view of the lower substrate of FIG. 1 taken along lines II ′ and II-II ′. FIG.

Referring to FIG. 3, the transparent conductive layer 14 of the data link DK and the scan link SK formed in the non-display area B of the organic EL display device includes indium tin oxide (ITO) and indium zinc oxide (IZO). ) And transparent conductive materials such as indium tin zinc oxide (ITZO) are deposited on the substrate 2 and patterned and then spaced apart at regular intervals. The transparent conductive layer 14 of the data link DK and the scan link SK formed in the non-display area B is formed in the same process as the data line (not shown) formed in the display area A. FIG.

The conductive material chromium (Cr) or molybdenum (Mo) is deposited on the substrate 2 on which the transparent conductive layer 14 of the data line, the data link DK, and the scan link SK is formed, and then patterned. The metal layer 16 of the data link DK and the scan link SK is formed to cover the DK and the transparent conductive layer 14 of the scan link SK.

The data link DK and the scan link SK have high resistance because the transparent conductive layer 14 of the data link DK and the scan link SK is formed of ITO, IZO, ITZO, or the like. The high resistance of the data link DK and the scan link SK not only lowers the luminous efficiency of the display device, but also the data link DK and the scan link from the data pad (not shown) and the scan pad (not shown). The signal applied to the data line DL and the scan line SL is distorted through the SK, which causes deterioration in image quality when the EL cell is driven.

Accordingly, chromium (Cr) or molybdenum (Mo) is deposited on the transparent conductive layer 14 of the data link DK and the scan link SK to compensate for the high resistance of the data link DK and the scan link SK. To form the metal layer 16. However, the metal layer 16 for compensating for the high resistance of the data link DK and the scan link SK has a resistance of chromium (Cr) of 12.7 Ωcm, and chromium in the case of molybdenum (Mo). Higher than the resistance of (Cr) was insufficient to compensate for the resistance due to the transparent conductive layer 14 of the data link (DK) and the scan link (SK).

In order to solve this problem, the use of aluminum (Al) having a lower resistance than chromium (Cr) or molybdenum (Mo) has been proposed. However, aluminum (Al) is oxidized when it comes into contact with oxygen. Due to such characteristics of aluminum (Al), there is a problem in that aluminum (Al) having low resistance cannot be used for the metal layer 16 of the data link DK and the scan link SK of the organic EL display device.

Accordingly, an object of the present invention is to provide an organic electroluminescent display device and a method of manufacturing the same, which can increase luminous efficiency and reduce image quality deterioration by reducing resistance of scan links and data links formed in non-display areas.

An organic electroluminescent display device according to an embodiment of the present invention includes a display area and a non-display area, the organic electroluminescence display device comprising: data lines and scan lines formed in the display area in a direction crossing each other; A data link extending from the data line formed in the non-display area and a scan link connected to the scan line; A data pad extended at a width wider than the width of the data link at the end of the data link formed in the non-display area and a scan pad extended at a width wider than the width of the scan link at the end of the scan link; The data link, the data pad, the scan link, and the scan pad may be formed of a plurality of conductive layers including a transparent conductive layer.

The multiple conductive layers include the transparent conductive layer formed on a substrate; An aluminum layer formed on the transparent conductive layer; A first metal layer formed between the transparent conductive layer and the aluminum layer; And a second metal layer formed on the aluminum layer.

The first metal layer is characterized in that the aluminum layer is prevented from being oxidized when connected to the transparent conductive layer.

The second metal layer is characterized in that the aluminum layer is prevented from being oxidized when exposed to air.

The first metal layer is characterized in that it comprises at least one of chromium or molybdenum.
The second metal layer is characterized in that it comprises at least one of chromium or molybdenum.

A method of manufacturing an organic electroluminescent display device according to an embodiment of the present invention is a method of manufacturing an organic electroluminescent display device having a display area and a non-display area, the data line in the display area, the data in the non-display area A data link extending along a line, a data pad extending in a width greater than the width of the data link at a longitudinal end of the data link, a scan link at the non-display area, and a scan link at the longitudinal end of the scan link. Forming a transparent conductive pattern of a scan pad extending in a wider width than the wide width; Forming a plurality of conductive patterns on the data link and the data pad and the transparent conductive pattern of the scan link and the scan pad; And forming a scan line connected to the scan link and intersecting the data line in the display area.

The forming of the plurality of conductive patterns may include forming a first metal pattern on the transparent conductive pattern; Forming an aluminum pattern on the first metal pattern; Forming a second metal pattern on the aluminum pattern.

The first metal pattern may prevent the aluminum pattern from being oxidized when contacted with the transparent conductive pattern.

The second metal pattern may prevent the aluminum pattern from being oxidized when exposed to air.

The first metal pattern may include at least one of chromium and molybdenum.
The second metal pattern may include at least one of chromium and molybdenum.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 4 to 8D.

4 is a plan view schematically illustrating a lower substrate of an organic EL display device according to an exemplary embodiment of the present invention.

Referring to FIG. 4, in the organic EL display device, data lines DL and scan lines SL intersecting with each other, and EL cells (not shown) arranged in a matrix type at each intersection thereof are formed to display an image during organic light emission. The display area A is implemented.

In addition, a data link DK in which the data line DL of the display area A is extended, and a data pad DP having a width wider than the width of the data link DK is formed at the end of the data link DK. A first and second scan pads having a data pad portion 74 and having a scan link SK connected to the scan line SL and a width wider than the width of the scan link SK at an end of the scan link. The non-display area B in which the first and second scan pad parts 82a and 82b having the SPa and the SPb are formed is provided.

The first and second scan pad portions 82a and 82b are separated on both sides of the data pad portion 74 for direct formation, and are formed below the substrate (not shown) of the organic EL display device.

The data pad 74 and the first and second scan pads 82a and 82b may include a data driver (not shown) for generating a data signal and a first and second scan driver (not shown) for generating a scan signal. It is connected to the implemented TCP.

The data pad unit 74 supplies a data signal supplied from the data driver to the data line DL to the corresponding data line DL through each data pad DP and the data link DK, and supplies the first and second data lines. The scan pad units 82a and 82b transmit scan signals supplied from the first and second scan drivers to the scan lines SL through the scan pads SPa and SPb and the scan links SKa and SKb. SL).

FIG. 5 is a plan view in which a part of the lower substrate of the organic EL display device of the present invention is formed, and FIG. 6 is a cross-sectional view taken along the lines III-III 'and IV-IV' shown in FIG.

5 and 6, the transparent conductive layer 64 of the data line DL in the display area A and the data link DK and the scan link SK in the non-display area B of the organic EL display device. ) Is formed by spaced at regular intervals by transparently depositing a conductive material such as ITO, IZO, ITZO on the substrate 52 and then patterning.

On the substrate 52 on which the data line DL is formed in the display area A, the data link DK and the scan link SL are formed in the non-display area B, the data link DK and In order to compensate for the high resistance due to the transparent conductive layer 64 of the scan link (SK) formed of transparent conductive materials such as ITO, IZO, and ITZO, chromium (Cr) or molybdenum, a conductive material having excellent interfacial properties and low resistance (Mo) is deposited entirely. Thereafter, aluminum (Al) is deposited on the entire surface of the substrate 52 on which chromium (Cr) or molybdenum (Mo) is deposited on the front surface, and chromium (Cr) or on the substrate 52 on which the aluminum (Al) is deposited on the front surface. Molybudene (Mo) is deposited on the entire surface and then patterned, thereby forming the first metal layer 66, the aluminum layer 68, and the second metal layer 70 of the data link DK and the scan link SK.

Since the data link DK and the scan link SK including the transparent conductive material such as ITO, IZO, ITZO, etc., via the non-display area B of the organic EL display device have high resistance, aluminum (Al) has a low resistance. ) To compensate for the data link DK and the scan link SK. At this time, the aluminum layer 68 of the data link DK and the scan link SK is oxidized due to contact with ITO, IZO, ITZO, etc., and the transparent conductive layer 64 of the data link DK and the scan link SK. And the first metal layer 66 formed between the aluminum layer 68 of the data link DK and the scan link SK, and prevents the aluminum layer 68 of the data link DK and the scan link SK. The exposure and air oxidation in the air are prevented by using the second metal layer 70 formed on the aluminum layer 68 of the data link DK and the scan link SK.

Hereinafter, descriptions related to the data link and the scan link will be described only for the scan link, and the structure of the data link is the same as the structure of the scan link.

FIG. 7 is a cross-sectional view of the lower substrate of FIG. 4 taken along the line VV ′ and a cross-sectional view of a region C. FIG.

Referring to FIG. 7, in the organic EL display device, the data lines DL are formed in the display area A on the substrate 52 at regular intervals. In addition, a data link (not shown) in which the data line DL of the display area A extends and a scan link SK connected to the scan line SL are disposed in the non-display area B on the substrate 52. Is formed.

The scan link SK and the data link include a transparent conductive layer 64, a first metal layer 66, an aluminum layer 68, and a second metal layer 70.

Thereafter, on the substrate 52 on which the data link and the scan link SK are formed in the non-display area B, openings are provided for each EL cell (not shown) area on the data line DL, and the scan of the display area A is performed. An insulating film 56 having a contact hole 72 for connecting the line SL and the scan link SK of the non-display area B is formed, and the organic light emitting layer 60 and the scan line are formed on the insulating film 56. A partition wall (not shown) for separating the SL is formed. The partition wall is formed in a direction crossing the data line DL. On the partition wall, the organic light emitting material is deposited using a mask, and the organic light emitting layer 60 is formed, and the electrode material is subsequently deposited on the entire surface to form the scan line SL. . Each scan link SK of the non-display area B and a corresponding scan line SL of the display area A are connected to the entire surface of the electrode material for forming the scan line SL.

8A to 8D are cross-sectional views showing step by step a manufacturing method of the organic EL display device of the present invention.

Referring to FIG. 8A, the data lines DL are formed by being spaced apart from each other by patterning a transparent conductive material, for example, ITO, IZO, ITZO, or the like, on the display area A on the substrate 52. At the same time, the transparent conductive layer (not shown) of the data link (not shown) and the transparent conductive layer 64 of the scan link (SK) to be connected to the scan line (SL) to be formed in a subsequent process are subjected to the substrate 52 in the same process. Are spaced apart at regular intervals in the non-display area B on the ().

Then, as shown in FIG. 8B, the first metal material is entirely deposited on the substrate 52 on which the data line DL, the transparent conductive layer of the data link, and the transparent conductive layer 64 of the scan link SK are formed. 1, aluminum (Al) is entirely deposited on the substrate 52 on which the metal material is deposited on the entire surface, and a second metal material is completely deposited on the substrate 52 on which the aluminum (Al) is deposited on the substrate 52, and then patterned. In the region B, a data link and a scan link SK including the transparent conductive layer 64 and including the first metal layer 66, the aluminum layer 68, and the second metal layer 70 are formed.

On the substrate 52 on which the data line DL of the display area A, the data link of the non-display area B, and the scan link SK are formed, as shown in FIG. An opening is formed in each area of the EL cell (not shown) on the DL and is connected to the scan line SL of the display area A and the scan link SK of the non-display area B to be formed in a subsequent process. An insulating film 56 having a contact hole 72 is formed. Next, a partition wall (not shown) for separating the organic light emitting layer 60 and the scan line 62 is formed on the display area A on which the insulating layer 56 is formed. The partition wall is formed in a direction crossing the data line 54, and as shown in FIG. 8D, an organic light emitting material is formed using a mask on the substrate 52 on which the partition wall is formed, and an organic light emitting layer 60 is subsequently formed. The entire surface is deposited and then patterned to form a scan line SL. Each scan link SK of the non-display area B and a corresponding scan line SL of the display area A are connected to the entire surface of the electrode material for forming the scan line SL.

As described above, the organic EL display device and the manufacturing method thereof according to the present invention are non-displayed by using a low resistance metal material such as an aluminum layer by using the first and second metal layers for the data link and the scan link. By reducing the resistance of the data link and the scan link formed in the region, it is possible to increase luminous efficiency and to reduce image quality degradation.

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 (12)

In an organic electroluminescent display device having a display area and a non-display area, A data line and a scan line formed in the display area in a direction crossing each other; A data link extending from the data line formed in the non-display area and a scan link connected to the scan line; A data pad extended at a width wider than the width of the data link at the end of the data link formed in the non-display area and a scan pad extended at a width wider than the width of the scan link at the end of the scan link; , And the data link, the data pad, the scan link, and the scan pad are formed of a plurality of conductive layers including a transparent conductive layer. The method of claim 1, The multiple conductive layer, The transparent conductive layer formed on the substrate; An aluminum layer formed on the transparent conductive layer; A first metal layer formed between the transparent conductive layer and the aluminum layer; And a second metal layer formed on the aluminum layer. The method of claim 2, The first metal layer, And preventing the aluminum layer from oxidizing when the aluminum layer is connected to the transparent conductive layer. The method of claim 2, The second metal layer is, And the aluminum layer is prevented from being oxidized when exposed to air. The method of claim 2, The first metal layer includes at least one of chromium and molybdenum. The method of claim 2, The second metal layer includes at least one of chromium and molybdenum. In the manufacturing method of an organic electroluminescent display device having a display area and a non-display area, A data link extending to the display area, a data link extending to the non-display area, a data pad extended to a width wider than the width of the data link at a longitudinal end of the data link, and a scan to the non-display area Forming a transparent conductive pattern of a link pad and a scan pad extending in a widthwise end of the scan link in a lengthwise width of the scan link; Forming a plurality of conductive patterns on the data link and the data pad and the transparent conductive pattern of the scan link and the scan pad; And forming a scan line connected to the scan link and intersecting the data line in the display area. The method of claim 7, wherein Forming the multiple conductive patterns, Forming a first metal pattern on the transparent conductive pattern; Forming an aluminum pattern on the first metal pattern; And forming a second metal pattern on the aluminum pattern. The method of claim 8, The first metal pattern is, And preventing the aluminum pattern from being oxidized when the aluminum pattern is in contact with the transparent conductive pattern. The method of claim 8, The second metal pattern is, And preventing the aluminum pattern from being oxidized when exposed to air. The method of claim 8, The first metal pattern includes at least one of chromium and molybdenum. The method of claim 8, The second metal pattern includes at least one of chromium and molybdenum.

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