KR100726943B1 - Organic Electro Luminescence Display Device And Method For Fabricating Thereof - Google Patents

Abstract

The present invention relates to an organic electroluminescent display device and a method of manufacturing the same that can prevent a defective pad portion.

An organic electroluminescent display device according to the present invention comprises: an organic electroluminescent array in which organic light emitting cells are arranged in a matrix; And a scan pad and a data pad for transmitting a driving signal from the outside to the organic electroluminescent array, wherein the scan pad and the data pad are formed of an opaque conductive layer.

Description

Organic electroluminescent display device and method for manufacturing same {Organic Electro Luminescence Display Device And Method For Fabricating Thereof}

1 is a cross-sectional view schematically showing a conventional organic electroluminescent display.

2 is a view showing a cross section of the organic light emitting cell by cutting the line II ′ shown in FIG. 1.

3 is a cross-sectional view illustrating a scan pad and a data pad of a conventional organic electroluminescent display.

4 is a perspective view schematically illustrating an organic electroluminescent display device according to the present invention.

FIG. 5 is a cross-sectional view taken along line II-II ′ shown in FIG. 4. FIG.

6 is a flowchart illustrating a method of manufacturing an organic electroluminescent display device according to the present invention.

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

2, 102: substrate 4: anode electrode

6: insulating film 8: partition wall

10 organic light emitting layer 12 cathode electrode

26: sealant 28, 128: cap

34, 134: opaque conductive layer 36: transparent conductive layer

37, 137: scan pad 47, 147: data pad

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 prevent a defective pad portion.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Flat display devices include Liquid Crystal Display (LCD), Field Emission Display (FED), Plasma Display Panel (PDP) and Electro-luminescence (EL) display devices. Etc. PDP is most advantageous for large screens because of its relatively simple structure and manufacturing process, but it has the disadvantages of low luminous efficiency, low luminance and high power consumption. Because LCD uses semiconductor process, large screen is difficult and power consumption is high due to backlight unit. In addition, LCD has a disadvantage of high light loss and a narrow viewing angle due to optical elements such as a polarizing filter, a prism sheet, and a diffusion plate. On the other hand, the EL display device has the advantages of fast response speed, high luminous efficiency, brightness and viewing angle, and is largely divided into an inorganic EL display device and an organic EL display device according to the material used.

The organic EL display device is driven at a voltage of about 5 to 20 V lower than that of an inorganic EL display device requiring a high voltage of 100 to 200 V, thereby enabling direct DC low voltage driving. In addition, the organic EL display device has excellent characteristics such as wide viewing angle, high-speed response, and high contrast ratio, so that it is a pixel of a graphic display, a pixel of a television image display, or a surface light source. It can be used and is not only thin and light but also good in color, making it suitable for next-generation flat panel displays.

1 is a cross-sectional view schematically illustrating a conventional organic EL display device, and FIG. 2 is a diagram illustrating an organic light emitting cell E by cutting the line I ′ of the organic EL array shown in FIG. 1.

The organic EL elements shown in Figs. 1 and 2 are formed on the substrate 2 in the direction in which the anode electrode 4 and the cathode electrode 12 cross each other.

A plurality of anode electrodes 4 are spaced apart at predetermined intervals on the substrate 2. On the substrate 2 on which the anode electrode 4 is formed, an insulating film 6 having an opening for each organic light emitting cell E region is formed. On the insulating film 6, a partition 8 for separating the organic light emitting layer 10 and the cathode electrode 12 to be formed thereon is positioned. The partition wall 8 is formed in a direction crossing the anode electrode 4 and has an overhang structure in which the upper end portion has a wider width than the lower end portion. On the insulating film 6 on which the partition 8 is formed, the organic light emitting layer 10 and the cathode electrode 12 made of an organic compound are sequentially deposited on the entire surface. The organic light emitting layer 10 expresses colors of red (R), green (G), and blue (B). In general, a separate organic material emitting red, green, and blue light is emitted for each pixel (P). It is formed by patterning.

As shown in FIG. 2, the organic light emitting layer 10 may include a hole injection layer 10e, a hole transport layer 10d, a light emitting layer 10c, an electron transport layer 10b, and an electron injection layer sequentially formed on the anode electrode 4. (10a).

Such an organic EL array 50 has a property of being easily degraded by moisture and oxygen. In order to solve this problem, an encapsulation process is performed to bond the substrate 2 and the cap 28 on which the organic EL array 50 is formed through the sealant 26 to be connected to the cathode electrode 12. The scan signal is supplied from the scan pad, and the data signal is supplied from the data pad connected to the anode electrode 4.

In the organic EL display device having such a configuration, when a voltage is applied between the anode electrode 4 and the cathode electrode 12, the electrons generated from the cathode electrode 12 may form the electron injection layer 10a and the electron transport layer 10b. It is moved toward the light emitting layer 10c through. In addition, holes generated from the anode electrode 4 move toward the light emitting layer 10c through the hole injection layer 10d and the hole transport layer 10d. Accordingly, in the light emitting layer 10c, light is generated by collision and recombination of electrons and holes supplied from the electron transport layer 10b and the hole transport layer 10d, and the light is emitted to the outside through the anode electrode 4. The image is displayed.

3 is a cross-sectional view illustrating a pad region in which scan pads and data pads of a conventional organic EL display are located.

The scan pads 37 and the data pads 47 in the pad region of the organic EL display shown in FIG. 3 are transparent conductive layers 36 and the transparent conductive layers 36 for improving the conductivity of the transparent conductive layers 36. ) And an opaque conductive layer 34 positioned to overlap with each other. The transparent conductive layer 36 may be formed of indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), or the like, and molybdenum (Mo) may be used as the opaque conductive layer 34. do.

The scan pad and the data pad having such a configuration are located outside the cap 28 for packaging the organic EL array 50, thereby being exposed to oxygen and moisture in an external environment.

When the scan pad and the data pad are exposed by moisture (H ₂ O), oxygen (O ₂ ), and the like, and a driving signal such as a data signal and a scan signal is supplied from the driver, the opaque conductive layer 34 and the transparent conductive layer ( 36) Galvanic corrosion due to the potential difference between them appears. As a result, a problem of a pad part failure, such as a driving signal, is not applied to the organic EL array 50.

Accordingly, an object of the present invention is to provide an organic electroluminescent display device and a method of manufacturing the same, which can prevent a defective pad portion.

In order to achieve the above object, the organic electroluminescent display device according to the present invention comprises an organic electroluminescent array in which the organic light emitting cells are arranged in a matrix form; And a scan pad and a data pad for transmitting a driving signal from the outside to the organic electroluminescent array, wherein the scan pad and the data pad are formed of an opaque conductive layer.

The organic light emitting cell includes an anode electrode and a cathode electrode positioned with an organic light emitting layer interposed therebetween, the data pad is electrically connected to the anode electrode, and the scan pad is electrically connected to the cathode electrode.

The opaque conductive layer is formed to a thickness of 2000 kPa to 3000 kPa.

A method of manufacturing an organic electroluminescent display device according to the present invention includes forming an organic electroluminescent array in which organic light emitting cells are arranged in a matrix, and forming a data pad and a scan pad for supplying a driving signal to the organic electroluminescent array. And the data pad and the scan pad are formed of an opaque conductive layer.

The organic light emitting cell includes an anode electrode and a cathode electrode positioned with an organic light emitting layer interposed therebetween, wherein the data pad is electrically connected to the anode electrode, and the scan pad is electrically connected to the cathode electrode.

The opaque conductive layer is formed to a thickness of 2000 kPa to 3000 kPa.

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. 4 and 6.

4 is a perspective view schematically illustrating an organic EL display device according to an exemplary embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line II-II ′ of FIG. 4.

The organic EL display device shown in FIGS. 4 and 5 includes a cap 128 for packaging the organic EL array 50 shown in FIG. 1 and pads 137 for transmitting driving signals to the organic EL array 50. 147 is provided with a pad region P2.

Inside the cap 128, the organic EL array 50 described in Fig. 1 and related descriptions is located. Details of the configuration of the organic EL array 50 have the same structure as those described in FIG. 1 and related descriptions, and thus detailed descriptions thereof will be omitted.

In the pad region P2, a data pad 147 for supplying a drive signal from the driver to the organic EL array 50 and scan pads 137 positioned on both sides of the data pad 147 are formed.

Here, the opaque conductive layer 134 is formed alone in the scan pad 137 and the data pad 147. Accordingly, galvanic corrosion of the pad region P2 due to the potential difference of the conductive layer does not occur.

This will be described in more detail as follows.

When a potential difference is generated between the conventional pads are transparent conductive layer and the opaque conductive layer 134 is the drive signal supplied by being stacked to form a transparent conductive layer and the opaque conductive layer 134, an oxygen (O ₂₎ and water ( H ₂ O) causes a galvanic corrosion problem in the transparent conductive layer and the opaque conductive layer 134.

In order to solve such a conventional problem, in the present invention, the opaque conductive layer 134 is formed alone to prevent defects such as galvanic corrosion due to the potential difference between the transparent conductive layer and the opaque conductive layer 134.

Here, molybdenum (Mo) or the like is used as the opaque conductive layer 134. At this time, molybdenum (Mo) is formed to a thickness of 2000 kPa to 3000 kPa. In the conventional pads, the transparent conductive layer is formed at about 1500 mW and the opaque conductive layer is formed at about 2500 mW, and the total thickness of the conductive layer is 4000 mW. Since the height is lower than the resistance, the sealant may be uniformly applied. In addition, since the transparent conductive layer having a higher resistance than the opaque conductive layer 134 is not formed, the line resistance is greatly reduced as compared with the conventional art.

As described above, the organic EL display device according to the present invention can prevent galvanic corrosion due to oxygen, moisture, etc. in the external environment by removing the transparent conductive layer from the pad and forming the opaque conductive layer 134 alone. The resistance is reduced and the sealant can be applied uniformly.

6 is a flowchart showing a method of manufacturing an organic EL display device according to the present invention.

First, the organic EL array 50 including the anode electrode 4 and the cathode electrode 12 is formed on the substrate 102 (S1). In addition, after the opaque conductive material is entirely deposited, the opaque conductive layer 134 is formed by being patterned to be connected to the anode electrode 4 and the cathode electrode 12 by a photolithography process and an etching process using a mask (S2). At this time, molybdenum (Mo) or the like is used as a material of the opaque conductive layer 134. As a result, the scan pad 137 and the data pad 147 formed of the opaque conductive layer 134 are formed. In this case, the scan pads 137 are positioned at both sides of the data pads 147, respectively.

Thereafter, the scan pad 137 and the data pad 147 are electrically connected to the TCP in which the drive integrated circuit is mounted through the ACF (S3), and the scan pad 137 and the data pad 147 are separated from the drive integrated circuit. The driving signal of is supplied to the organic EL array.

As described above, the organic electroluminescent display and the method of manufacturing the same according to the present invention form a scan pad and a data pad only as an opaque conductive layer to prevent pad defects such as galvanic corrosion due to oxygen, moisture, etc. in an external environment. In addition, it is possible to reduce the line resistance of the pad portion and apply the sealant uniformly.

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 (6)

An organic electroluminescent array in which organic light emitting cells are arranged in a matrix; A scan pad and a data pad for transmitting a driving signal from the outside to the organic electroluminescent array, The scan pad and the data pad are formed of an opaque conductive layer. According to claim 1, The organic light emitting cell, An anode electrode and a cathode electrode positioned with the organic light emitting layer interposed therebetween, The data pad is electrically connected to the anode electrode, And the scan pad is electrically connected to the cathode electrode. The method of claim 2, And the opaque conductive layer is formed to a thickness of 2000 kPa to 3000 kPa. Forming an organic electroluminescent array in which organic light emitting cells are arranged in a matrix; Forming a data pad and a scan pad for supplying a driving signal to the organic electroluminescent array, The data pad and the scan pad are formed of an opaque conductive layer. The method of claim 4, wherein The organic light emitting cell, An anode electrode and a cathode electrode positioned with the organic light emitting layer interposed therebetween, The data pad is electrically connected to the anode electrode, And the scan pad is formed to be electrically connected to the cathode electrode. The method of claim 5, And wherein the opaque conductive layer is formed to a thickness of 2000 kPa to 3000 kPa.

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