KR100656494B1 - 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 pixel having a first electrode, a second electrode, and an organic thin film layer interposed between the first and second electrodes, and for providing a predetermined voltage to each pixel of the pixel region. It includes a common power supply line, characterized in that to provide a predetermined voltage by connecting the second electrode directly to the pad (pad). By connecting the cathode electrode directly with a pad without forming a power supply line for supplying a voltage to the cathode, the area of the cathode power supply line is eliminated in the related art, thereby providing the advantage of reducing the panel width by the area. do.

Cathode power supply line, pad

Description

Organic Electroluminescence Display Device             

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

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

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

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

100, 200: organic electroluminescent display

110, 210: common power supply line

111, 211: common power line

120, 220, 320: cathode electrode

121: cathode power supply line

140, 240: Scan driver

150, 250: Data driver

160, 260, 360: pixel area

270, 370a, 370b: protrusion of the cathode electrode

280, 380: pad

The present invention relates to an organic light emitting display device, and more particularly, to an organic light emitting display device characterized in that a cathode is directly connected to a pad to provide a predetermined voltage.

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. It provides a cathode power supply line 121.

As described above, in order to supply a predetermined voltage to the cathode electrode 120, the cathode power supply line 121 is separately formed and used. Therefore, there is a problem in that the width of the panel increases by the area occupied by the cathode power supply line.

The technical problem to be solved by the present invention is to solve the above-mentioned problems of the prior art, and the cathode is directly connected to a pad without forming a power supply line for providing a voltage to the cathode. An object of the present invention is to provide an organic light emitting display device.

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 pixel having a first electrode, a second electrode, and an organic thin film layer interposed between the first and second electrodes, and a common power supply for providing a voltage to each pixel of the pixel region. And a supply line, wherein the second electrode is directly connected to a pad to provide a voltage to the second electrode.

The second electrode may be a cathode electrode. The cathode electrode is preferably made of one material selected from the group consisting of Al, Ag, MgAg alloy and Ca.

At least two protrusions may be formed on the second electrode to be connected to the pad.

Two or more protrusions formed on the second electrode are preferably formed symmetrically.

The organic light emitting display device may be a bottom emission organic light emitting display device.

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.

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

Referring to FIG. 2, the organic light emitting display device 200 according to the first exemplary embodiment of the present invention includes a pixel region 260 in which a plurality of pixels are arranged, and an upper side, a left side, a right side, and a right side of the pixel region 260. A common power supply line 210 arranged in the common power supply line 210 to supply a power supply voltage to the pixel region 260, and a common power supply line 211 arranged in the common power supply line 210 to supply voltage to each pixel. And a scan driver 240 for outputting a selection signal to the pixel region 260, and a data driver 250 for outputting a data signal to the pixel region 260.

In addition, a cathode electrode 220 is formed on the pixel region 260.

In this case, a cathode power supply line which has been conventionally formed to supply a predetermined voltage to the cathode electrode 220 is not separately formed. Instead, the cathode electrode 220 is directly connected to a pad. The pad refers to a connection terminal for supplying power.

In detail, when the cathode electrode 220 is formed, a protrusion is formed on a portion of the cathode electrode. The protrusion which is a part of the cathode electrode 220 is connected to the pad to supply power to the cathode electrode 220.

Therefore, in the present invention, the width of the panel can be reduced by the area occupied by the cathode power supply line formed in the related art. Since the width of the cathode power supply line is generally 1 to 2 mm, the width of the panel can be reduced by the width.

In this case, the cathode electrode 220 may be formed using Al, Ag, MgAg alloy and Ca. In particular, in the case of Al or Ag, since the resistance is small, even if the cathode electrode is directly connected to the pad as in the present invention, since the voltage drop is not large, the power supply can be made uniform.

In addition, when the organic light emitting display emits back light, a low-resistance cathode electrode such as Al or Ag is used. Therefore, even when the cathode is directly connected to the pad, power can be supplied uniformly without a large voltage drop. .

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

Referring to FIG. 3, the cathode electrode 320 is formed on the pixel area 360. In order to supply a predetermined voltage to the cathode electrode 320, a cathode power supply line, which is conventionally formed, is not separately formed as in the first embodiment of the present invention. Two protrusions formed on the cathode electrode are directly connected to the pad to supply power to the cathode electrode 320.

Therefore, since power is supplied to the cathode electrode 320 through the two protrusions, the power may be uniformly supplied even if the resistance of the cathode electrode 320 is slightly higher.

In addition, it is preferable that two or more protrusions formed on the cathode electrode are formed symmetrically. When the two or more protrusions are formed symmetrically, power may be more uniformly supplied than when the protrusions are formed asymmetrically.

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

As described above, according to the present invention, the cathode electrode is directly connected to a pad without forming a power supply line for supplying voltage to the cathode electrode, thereby eliminating the area occupied by the cathode power supply line in the related art. This offers the advantage of reducing the panel width by as much as possible.

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 (6)

A pixel region in which a predetermined pixel includes an organic thin film layer interposed between the first electrode, the second electrode, and the first and second electrodes, and a common power supply line for providing a voltage to each pixel of the pixel region. And providing a voltage to the second electrode by directly connecting the second electrode to a pad. The method of claim 1, And the second electrode is a cathode electrode. The method of claim 2, And the cathode electrode is made of one material selected from the group consisting of Al, Ag, MgAg alloy, and Ca. The method of claim 1, And at least two protrusions formed on the second electrode and connected to the pads. The method of claim 4, wherein And at least two protrusions formed on the second electrode are symmetrically formed. The method of claim 1, The organic light emitting display device emits back light.

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