KR20070122075A - Light emitting display - Google Patents

Abstract

A light emitting display device is provided to monitor a brightness and a light emitting efficiency of respective sub-pixels by turning on respective sub-pixels independently. A light emitting display device includes a substrate, a pixel unit and first and second pad units. The pixel unit includes a light emitting unit formed between two electrodes which are formed on the substrate. The first pad unit is formed on one side of the substrate to be electrically connected to the electrodes. A driving device for supplying data and scan signals is installed on the first pad unit. The second pad unit(PAD2) is electrically connected to a part of the first pad unit. The second pad unit is formed to be divided into at least three layers on the substrate.

Description

Light Emitting Display

1 is a plan view of a conventional electroluminescent display.

FIG. 2 is an enlarged view of the driving unit D of FIG. 1.

3 is an enlarged view of a second pad part PAD2 of FIG. 2;

4 is a plan view of an electroluminescent display device according to the present invention;

5 is an enlarged view of the driving unit D of FIG. 4.

FIG. 6 is an enlarged view of the second pad part PAD2 of FIG. 5.

7 is an enlarged view according to a modified embodiment of the second pad part PAD2;

<Explanation of symbols on main parts of the drawings>

S: substrate P: pixel portion

D: drive part PAD1: first pad part

PAD2: Second pad portion DP: Data pad

SP: Scan Pad OP: Out Pad

The present invention relates to an electroluminescent display device.

The electroluminescent device used in the electroluminescent display device was a self-light emitting device having a light emitting layer formed between two electrodes. Electroluminescent devices could be divided into inorganic electroluminescent devices and organic electroluminescent devices according to the material of the light emitting layer.

In addition, the electroluminescent device has a top emission type, a bottom emission type, and a dual emission type according to a direction in which light is emitted, and a passive matrix type according to a driving method. Passive Matrix) and Active Matrix.

Hereinafter, a conventional electroluminescent display device will be described with reference to the drawings.

1 is a plan view of a conventional electroluminescent display, FIG. 2 is an enlarged view of the driving unit D of FIG. 1, and FIG. 3 is an enlarged view of the second pad unit PAD2 of FIG. 2.

As shown in FIG. 1, in the conventional electroluminescent display device 100, a pixel portion P is formed on a substrate S, and a driving unit D is formed on either side of the substrate S. As shown in FIG.

Although the pixel portion P is not shown in detail, but the passive matrix type, the organic light emitting portion is embedded between the two electrodes, and the light emitting portion may emit light by a signal supplied to the two electrodes through the driving unit D. However, in the case of the active matrix type, a transistor and a capacitor are further formed such that the transistor is driven by a signal supplied to the two electrodes through the driving unit D to emit light.

Referring to FIG. 2, the driver D includes a first pad part PAD1 on which a driving IC (Integrated Circuit) is mounted. The first pad part PAD1 is divided into a data pad DP, a scan pad SP, an out pad OP, and the like.

Further, a second pad portion PAD2 is further formed in an inner region of the first pad portion PAD1, which is formed for the purpose of checking lighting of the pixel portion P before mounting the driving IC.

Referring to FIG. 3, the second pad part PAD2 is formed of two layer structures (Even / Odd) to float white gray on the pixel part P, and to form a line or a panel of the panel. Defects such as pixels, and spots or defects in image quality were examined.

In the electroluminescent display device 100, a current and emission luminance / efficiency test for red, green, and blue (R, G, B) colors constituting the light emitting unit should be added. (The light emitter is a single pixel, which includes subpixels such as red, green, and blue.)

However, the conventional second pad portion PAD2 has a problem in that it is not suitable to be implemented in a two-layer structure in order to inspect red, green, and blue light independently of the light emitting portion. In addition, the conventional structure of the second pad portion PAD2 has a problem with a narrow pitch between the pads.

SUMMARY OF THE INVENTION An object of the present invention for solving the above-described problems is to provide an electroluminescent display device capable of inspecting each subpixel's image quality, emission luminance and efficiency state by allowing each subpixel to independently light.

In order to solve the above problems, an electroluminescent display device according to the present invention includes a substrate, a pixel portion including a light emitting portion formed between two electrodes formed on the substrate, and electrically connected to two electrodes, respectively, to scan a data signal and scan. A first pad portion formed on either side of the substrate so that the driving device for supplying the signal is mounted, and a second pad portion electrically connected to some or all of the first pad portion and divided into three or more layers on a plane of the substrate. do.

The light emitting unit may include one pixel including red, green, and blue, and the second pad unit may be divided into three layers to correspond to the color of the light emitting unit.

Here, the second pad part may have a length different from each other, or one or more pads may be relatively longer than the other one.

Here, the second pad part may have a length of each layer pad 200 ~ 300 ㎛.

Here, the second pad unit may be an inspection pad for contacting the external inspection device to supply the inspection scan signal and the data signal to the pixel unit.

Here, the second pad part may be positioned in an inner region of the first pad part, and both left and right parts may be configured to supply a scan signal, and a center part may be configured to supply a data signal.

Here, the pixel unit may include a light emitting unit electrically connected to one or more transistors.

Here, the light emitting unit may include an organic material.

<Example 1>

4 is a plan view of the electroluminescent display device according to the present invention, FIG. 5 is an enlarged view of the driving unit D of FIG. 4, FIG. 6 is an enlarged view of the second pad unit PAD2 of FIG. 5, and FIG. 7 is a second pad unit. An enlarged view according to a modified embodiment of PAD2.

As shown in FIG. 4, in the electroluminescent display 200 according to the present invention, a pixel portion P is formed on a substrate S, and a driving unit D is formed on one side of the substrate S. As shown in FIG. .

Although the pixel portion P is not shown in detail, but in the case of a passive matrix, the light emitting portion is embedded between two electrodes, and the light emitting portion may emit light by a signal supplied to the two electrodes through the driving portion D. Can be.

However, in the case of an active matrix type, a transistor and a capacitor are further formed such that the transistor is driven by a signal supplied to the two electrodes through the driving unit D to emit light.

More specifically, for example, the active matrix type, one or more thin film transistors and capacitors are formed on the substrate (S). Each thin film transistor may be divided into one or more switching transistors and a driving transistor.

The thin film transistor may be formed of amorphous silicon (a-Si), polysilicon (p-Si) or low temperature silicon (LTPS) to form an N-MOS type or a P-MOS type depending on the channel, but is not limited thereto. Do not.

The light emitting part is formed to be electrically connected to the source or drain electrode of the driving transistor, and may be formed of an organic material or an inorganic material. For reference, the light emitting unit is one pixel and includes subpixels of red, green, and blue.

The light emitting unit may be selectively formed according to a top-emission method, a bottom-emission method, a dual-emission method, or the like according to a direction in which light is emitted.

The pixel portion P formed on the substrate S as described above may be sealed by inserting a moisture absorbent or the like to protect the device from oxygen or moisture.

The light emitting unit formed in the pixel unit P is driven by the driving transistor by the data signal and the scan signal supplied to the data line and the scan line electrically connected to the driving unit D so that the light emitting unit emits light.

Referring to FIG. 5, the driver D is provided with a first pad part PAD1 on which a driving IC (Integrated Circuit) is mounted. The first pad part PAD1 is divided into a data pad DP, a scan pad SP, an out pad OP, and the like.

The data pad DP is electrically connected to a data line connected to any one of the electrodes of the pixel portion P, and the scan pad SP is electrically connected to the scan line connected to any one of the electrodes of the pixel portion P. Connected. In addition, the out pad OP is a pad electrically connected to supply the data signal and the scan signal to the driving unit D from an external control device.

 The first pad part PAD1 is formed on one side of the substrate S so that a driving IC, which is a driving device electrically connected to two electrodes and supplying a data signal and a scan signal, is mounted.

The second pad part PAD2 is electrically connected to a part or all of the first pad part PAD1 in the inner region of the first pad part PAD1 and divided into three or more layers on a plane of the substrate S. FIG. Is formed.

The second pad part PAD2 may be configured to supply scan signals to both left and right parts in the inner region of the first pad part PAD1, and the center part to supply a data signal.

The second pad part PAD2 is connected to an external inspection device before mounting the driving IC, and supplies a data signal and a scan signal from the inspection device to the pixel portion S to test lighting of the pixel portion P. It is done.

In particular, the second pad part PAD2 may selectively perform any one or more of a lighting test, a luminance test, an efficiency test, or a current test for the color of each subpixel.

Referring to FIG. 6, the second pad part PAD2 is divided into three layers, which correspond to red, green, and blue, which are subpixels. If the light emitting unit is formed of four or more instead of three color subpixels, the light emitting unit may be formed to be divided into four layers.

The pads of each layer of the second pad part PAD2 may have the same length, but as shown in FIG. 7, the lengths of the pads of each layer may be different from each other, or any one or more pads may be formed relatively longer than the other one. (The pitch of the pad can be increased by more than 1.5 times compared to the conventional one.)

As a result, the pitch between the pads can be increased, so that probes of the inspection apparatus can be contacted more stably, and the alignment margins are improved to cause the pads to be scratched. Pad failure rate can also be improved.

On the other hand, the length of the pad for each layer to have a range of 200 ~ 300 ㎛, the distance between the pad and the pad can be formed to have a range of 50 ㎛ in this case it is to reduce the pitch of the pad to increase the size of the driving unit (D) You can prevent it.

However, it should be recognized that the structure is divided into three layers, which is not meant to prevent the size of the driving unit D from being increased by the above pitch.

According to the present invention described above, various inspections can be performed by independently driving the subpixels by a pad structure divided into three layers, and improving the contact margin of the pads. Difficulty can be improved.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

According to the above-described configuration of the present invention, it is possible to provide an electroluminescent display device capable of inspecting each subpixel independently so as to inspect the image quality, emission luminance and efficiency state of each subpixel.

Claims (8)

Board; A pixel portion including a light emitting portion formed between two electrodes formed on the substrate; A first pad part formed on one side of the substrate to be mounted with a driving device electrically connected to the two electrodes to supply a data signal and a scan signal; And And a second pad part electrically connected to some or all of the first pad part and formed to be divided into three or more layers on a plane of the substrate. The method of claim 1, The light emitting part includes one pixel including red, green, and blue, And the second pad part is formed in three layers so as to correspond to a color of the light emitting part. The method of claim 1, wherein the second pad unit, Electroluminescent display device, characterized in that the length of the pad for each layer is different from each other, or at least one is longer than the other. The method of claim 1, wherein the second pad unit, Electroluminescent display device, characterized in that the length of the pad for each layer has a range of 200 ~ 300 ㎛. The method of claim 1, wherein the second pad unit, And an inspection pad for contacting an external inspection device to supply an inspection scan signal and a data signal to the pixel portion. The method of claim 1, wherein the second pad unit, An electroluminescence display device positioned in an inner region of the first pad part, the left and right parts of the first pad part supplying the scan signal, and a center part of the first pad part supplying the data signal. The method of claim 1, wherein the pixel unit, And a light emitting unit electrically connected to at least one transistor. The method of claim 1, wherein the light emitting unit, Electroluminescent display device containing organic matter.

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