KR100635566B1 - Organic Electroluminescence Display Device - Google Patents

Abstract

An organic electroluminescent display device is provided. The apparatus includes: a pixel region in which predetermined pixels are arranged, each having a first electrode, a second electrode, and an organic thin film layer interposed between the first and second electrodes; A common power supply line for providing a predetermined voltage to each pixel of the pixel area; And a power supply line for providing a predetermined voltage to the second electrode, wherein the power supply line is formed on a planarization layer, and on the power supply line. And contact with the second electrode through a contact hole included in the pixel defining layer formed on the substrate. By forming a pixel definition layer on the cathode power supply line as well as the pixel region of the organic light emitting display device and contacting the cathode electrode, the cathode power supply line formed on the planarization layer during heat treatment for forming the pixel definition layer can be prevented from peeling off. It is an advantage to provide an organic electroluminescent display device.

AlNd, Pixel Definition Film

Description

Organic Electroluminescence Display Device             

1 is a plan view illustrating a conventional organic light emitting display device;

2 is a photograph showing that the AlNd peeled off the planarization film,

3 is a plan view illustrating an organic light emitting display device according to a first embodiment of the present invention;

4 is a plan view illustrating an organic light emitting display device according to a second embodiment of the present invention;

FIG. 5A is a cross-sectional structural view illustrating a portion II ′ of the organic light emitting display device according to the first and second exemplary embodiments of the present invention; FIG.

5B is a cross-sectional structure diagram illustrating a II-II 'portion of the organic light emitting display device according to the second exemplary embodiment of the present invention.

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

100, 300: organic electroluminescent display

110, 310: common power supply line

111, 311: common power line

120, 320, 420, 550: cathode electrode

121, 321, 421, 521: first cathode power supply line

122, 422, 522: second cathode power supply line

540: contact hole

140, 340, 500: Scan driver

150, 350: Data driver

160, 360, 460: pixel area

510: planarization film

530: pixel definition layer

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 in which a pixel definition layer including a contact hole is formed on a cathode power supply line in a portion other than the pixel region, thereby contacting the cathode electrode through the contact hole. It relates to a display device.

Among flat panel displays, organic electroluminescence displays (OLEDs) are self-luminous, having a wide viewing angle, fast response speed, thin thickness, low manufacturing cost, and high contrast. It is attracting attention as a next-generation flat panel display device in the future. Such an organic light emitting display uses a phenomenon in which light is generated by electrons and holes forming electron-hole pairs in a semiconductor or when carriers are excited to a higher energy state and then fall back to a stabilized ground state. . The organic light emitting display device is classified into a passive matrix OLED (PMOLED) and an active matrix OLED (AMOLED) according to a driving method thereof.

1 is a plan view illustrating a conventional organic light emitting display device.

Referring to FIG. 1, the organic light emitting display device 100 is arranged in a pixel area 160 including a plurality of pixels, and is disposed above, left, and right of the pixel area 160 to apply a power voltage. A power supply line 110, a common power supply line 111 arranged on the common power supply line 110 for supplying a voltage to each pixel, a scan driver 140 for outputting a selection signal, and a data signal It includes a data driver 150 for outputting.

In addition, the cathode electrode 120 is disposed on the pixel region 160 and the cathode electrode 120 is arranged on one side of the pixel region 160 so as to overlap the cathode voltage with the cathode electrode 120. A first cathode power supply line 121 to be provided and a second cathode power supply for providing a cathode voltage to the cathode electrode 120 arranged to overlap the cathode electrode 120 on the other side of the pixel region 160. Supply line 122.

The first and second cathode power supply lines 121 and 122 are formed on a planarization layer (not shown), and form a plurality of contact holes, respectively, and are connected to the cathode electrode 120.

As described above, in the conventional case, the cathode power supply line is in contact with the cathode electrode through the contact hole. However, when the cathode power supply line is formed on the planarization film and the heat treatment process for forming the pixel definition layer is performed, the cathode power supply line may be peeled off on the planarization film. In particular, when an organic film is used as the planarization film and a metal film such as AlNd is used as the cathode power supply line, it is highly likely that the AlNd is peeled off due to a difference in coefficient of thermal expansion between the planarization film and AlNd generated by a subsequent heat treatment process. . This case often occurs at the portion where the AlNd pattern area is large.

2 is a photograph showing that AlNd on the planarization film is peeled off.

Referring to FIG. 2, although a metal film such as AlNd was formed on the planarization film made of acrylic resin, it can be seen that AlNd was peeled off in a circular shape during the heat treatment process for forming the pixel definition layer.

The technical problem to be solved by the present invention is to solve the above-described problems of the prior art, by forming a pixel definition layer not only on the pixel region but also on the cathode power supply line and contacting the cathode electrode to planarize the heat treatment for forming the pixel definition layer. The purpose is to prevent the cathode power supply line formed on the film from peeling off.

In order to achieve the above technical problem, the present invention provides an organic light emitting display device. The apparatus includes: a pixel region in which predetermined pixels are arranged, each having a first electrode, a second electrode, and an organic thin film layer interposed between the first and second electrodes; A common power supply line for providing a predetermined voltage to each pixel of the pixel area; And a power supply line for providing a predetermined voltage to the second electrode, wherein the power supply line is formed on a planarization layer, and on the power supply line. And contact with the second electrode through a contact hole included in the pixel defining layer formed on the substrate.

The second electrode may be a cathode electrode, and the power supply line may be a cathode power supply line.

The cathode power supply line may be formed on the upper part of the scan driver.

The apparatus may further include a pixel region in which predetermined pixels including an organic thin film layer interposed between the first electrode, the second electrode, and the first and second electrodes are arranged; A common power supply line for providing a predetermined voltage to each pixel of the pixel area; And a power supply line for providing a predetermined voltage to the second electrode, wherein the power supply line is arranged on at least two sides of the pixel area, the array The power supply line is formed on the planarization layer and is in contact with the second electrode through a contact hole included in the pixel definition layer formed on the power supply line.

The second electrode may be a cathode electrode, and the power supply line may be a cathode power supply line.

Any one of the arranged cathode power supply lines may be formed on the scan driver.

The cathode power supply line may be made of a metal film. The metal film may be made of one material selected from the group consisting of Al, Al alloy, Mo, MoW, Ag, Ti, and Cr.

The metal film may be made of AlNd.

The cathode power supply line may be formed of the same material as the anode electrode.

The planarization layer may be an organic layer. The organic layer may be made of any one material selected from the group consisting of BCB, acrylic resin, and polyimide.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings in order to describe the present invention in more detail. Like numbers refer to like elements throughout the specification.

3 is a plan view illustrating an organic light emitting display device according to a first embodiment of the present invention.

Referring to FIG. 3, the organic light emitting display device 300 according to the first exemplary embodiment of the present invention includes a pixel region 360 in which a plurality of pixels are arranged, and an upper side, left and right sides of the pixel region 360. A common power supply line 310 arranged in the common power supply line 310 to supply a power supply voltage to the pixel region 360, and a common power supply line 311 arranged in the common power supply line 310 to supply voltage to each pixel. And a scan driver 340 for outputting a selection signal to the pixel region 360, and a data driver 350 for outputting a data signal to the pixel region 360.

In addition, the cathode electrode 320 arranged on the pixel region 360 and the cathode electrode 320 are arranged on one side of the pixel region 360 so as to overlap the cathode voltage with the cathode electrode 320. It provides a cathode power supply line 321.

The cathode power supply line 321 is formed on the planarization layer and is formed on the scan driver. Details are described in FIG. 5A.

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

Referring to FIG. 4, the cathode electrode 420 is disposed on the pixel region 460, and the cathode electrode 420 is arranged to overlap the cathode electrode 420 on one side of the pixel region 460. A first cathode power supply line 421 providing a cathode voltage to the cathode and the cathode electrode 420 on the other side of the pixel region 460 to provide a cathode voltage to the cathode electrode 420. A second cathode power supply line 422 is included.

The second cathode power line 421 is formed on the planarization layer. Details are described in FIG. 5B.

Except as described above, the organic light emitting display device according to the first exemplary embodiment of the present invention is the same.

FIG. 5A is a cross-sectional structural view illustrating part II ′ of the organic light emitting diode display according to the first and second exemplary embodiments of the present invention.

Referring to FIG. 5A, a planarization film 510 is formed on the scan driver 500, and a first cathode power supply line 521 is formed on the planarization film 510. As described above, the first cathode power supply line 521 is formed on the scan driver 500 to increase the pixel area.

The first cathode power supply line 521 may be formed of a metal film such as AlNd, and may be formed of the same material as the anode electrode. In other words, the remaining portion of the anode may be used as the first cathode power supply line without being used as an electrode. In this case, a large AlNd pattern area may be formed, thereby causing AlNd to peel off as described above in a subsequent heat treatment process.

In the present invention, in order to solve the above problem, the pixel defining layer 530 is formed on the first cathode power supply line 521. In general, the pixel definition layer is generally formed in the pixel region to define the pixel portion in the pixel region. However, in the present invention, the pixel definition layer 530 is formed not only on the pixel region but also on the first cathode power supply line 521. do. The heat treatment process for forming the pixel definition layer 530 is performed at 25 ° C. for 2 hours. As described above, since the pixel definition layer 530 is formed on the first cathode power supply line 521, the first cathode power supply line 521 on the planarization layer during the heat treatment process for forming the pixel definition layer 530. This can prevent it from peeling off.

A plurality of contact holes 540 are formed in the pixel definition layer 530. Subsequently, a cathode electrode 550 is formed on the pixel defining layer 530. The cathode electrode 550 is in contact with the first cathode power supply line through the contact hole 540.

5B is a cross-sectional structure diagram illustrating a II-II 'portion of the organic light emitting display device according to the second exemplary embodiment of the present invention.

Referring to FIG. 5B, a second cathode power supply line 522 is formed on the planarization layer 510. The second cathode power supply line 522 is arranged on the other side of the pixel region 460 to overlap the cathode electrodes 420 and 550 to provide a cathode voltage to the cathode electrodes 420 and 550.

Except as described above, in the organic light emitting display device according to the first and second embodiments of the present invention, the cross-sectional structure diagram showing the portion 'I-I'.

As described above, according to the present invention, a cathode is formed on the planarization layer during heat treatment for forming the pixel definition layer by forming a pixel definition layer on the cathode power supply line as well as the pixel region of the organic light emitting display device and contacting the cathode electrode. It is an advantage to provide an organic light emitting display that can prevent the power supply line from peeling off.

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (18)

A pixel region in which predetermined pixels including an organic thin film layer interposed between the first electrode, the second electrode, and the first and second electrodes are arranged; A common power supply line for providing a predetermined voltage to each pixel of the pixel area; And Comprising a region overlapping with the second electrode, and includes a power supply line for providing a predetermined voltage to the second electrode, And the power supply line is formed on the planarization layer and is in contact with the second electrode through a contact hole included in the pixel definition layer formed on the power supply line. The method of claim 1, And the second electrode is a cathode electrode and the power supply line is a cathode power supply line. The method of claim 2, And the cathode power supply line is formed above the scan driver. The method of claim 2, And the cathode power supply line is made of a metal film. The method of claim 4, wherein And the metal layer is made of one material selected from the group consisting of Al, Al alloy, Mo, MoW, Ag, Ti, and Cr. The method of claim 4, wherein And the metal layer is made of AlNd. The method of claim 2, And the cathode power supply line is formed of the same material as the first electrode. The method of claim 1, And the planarization layer is an organic layer. The method of claim 8, And the organic layer is made of any one material selected from the group consisting of BCB, acrylic resin, and polyimide. A pixel region in which predetermined pixels including an organic thin film layer interposed between the first electrode, the second electrode, and the first and second electrodes are arranged; A common power supply line for providing a predetermined voltage to each pixel of the pixel area; And Comprising a region overlapping with the second electrode, and includes a power supply line for providing a predetermined voltage to the second electrode, The power supply line is arranged on at least two side surfaces of the pixel region, and the arranged power supply line is formed on a planarization layer, and the contact hole is included in the pixel definition layer formed on the power supply line. The organic electroluminescent display device is in contact with the second electrode. The method of claim 10, And the second electrode is a cathode electrode and the power supply line is a cathode power supply line. The method of claim 11, And any one of the arranged cathode power supply lines is formed above the scan driver. The method of claim 11, And the cathode power supply line is made of a metal film. The method of claim 13, And the metal layer is made of one material selected from the group consisting of Al, Al alloy, Mo, MoW, Ag, Ti, and Cr. The method of claim 13, And the metal layer is made of AlNd. The method of claim 11, And the cathode power supply line is formed of the same material as the first electrode. The method of claim 10, And the planarization layer is an organic layer. The method of claim 17, And the organic layer is made of any one material selected from the group consisting of BCB, acrylic resin, and polyimide.

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