KR100669740B1 - Flat display device - Google Patents

Abstract

According to an aspect of the present invention, a pixel is provided to protect a pixel from external static electricity, and includes a substrate, a plurality of pixel electrodes formed on the substrate, and a conductive pattern formed on the substrate to be insulated from the pixel electrode. It is about.

Description

Flat display device

1 is a schematic view of a flat panel display device according to an exemplary embodiment of the present invention, which is a cross-sectional view showing one pixel of an organic light emitting display device;

2 is a plan view of some pixels including the pixel of FIG. 1;

3 is a schematic view of an entire screen and a plan view showing a state in which a conductive pattern is grounded;

4 is a schematic plan view of an entire screen, and a plan view illustrating a state in which a conductive pattern is grounded;

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

10: substrate 11: buffer layer

12: active layer 13: gate insulating film

14: gate electrode 16: interlayer insulating film

17: source electrode 18: drain electrode

20: insulating film 21: pixel defining film

30 pixel electrode 31 organic light emitting film

32: counter electrode 40: conductive pattern

41: voltage holding circuit 43: xenodiode

The present invention relates to a flat panel display, and more particularly, to a flat panel display having an improved structure to prevent static electricity.

In general, a flat displat device may be classified into a light emitting type and a light receiving type. The light emitting type includes a flat cathode ray tube, a plasma display panel, an electroluminescent device, a light emitting diode, and the like. As a light receiving type, a liquid crystal display is mentioned.

In such a flat panel display, a patterned pixel electrode is usually provided for each pixel, and in the case of an active matrix type, a selection driving circuit is connected to the pixel electrode. The selection driving circuit includes one or more TFTs and one or more storage capacitors capable of storing data.

However, when the storage capacitor is charged by external static electricity, the image may be deformed and unwanted stains may appear or be damaged.

This phenomenon is particularly common in organic electroluminescent displays. In the case of LCDs, a substrate on which a TFT is formed is located on the opposite side of the display surface centered on the liquid crystal, and a substrate on which a color filter is formed is disposed on the display surface. Although it may be relatively insensitive to (electrostatic), an organic light emitting display device has a short distance from the surface of the display to the capacitor electrode, making it very sensitive to external static electricity.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flat panel display device that can protect a pixel from external static electricity.

In order to achieve the above object, the present invention provides a flat panel display device comprising a substrate, a plurality of pixel electrodes formed on the substrate, and a conductive pattern formed on the substrate so as to be insulated from the pixel electrodes. do.

Hereinafter, a flat panel display device according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 schematically illustrates a flat panel display according to an exemplary embodiment of the present invention, and illustrates some pixels of an organic light emitting display.

2 is a plan view of some pixels including the pixel of FIG. 1, and FIGS. 3 and 4 are plan views schematically illustrating an entire screen.

Referring to FIG. 1, each pixel of the organic light emitting display device is provided such that red, green, and blue pixels are repeatedly arranged, and the configuration of the pixels is not limited thereto. The pixels may be arranged in various patterns such as a mosaic or a grid. These pixels are arranged in a display area (not shown) of the organic light emitting display device to implement a predetermined image, and each pixel of the display area is a TFT, a capacitor (Cst), etc. as shown in FIG. And a selective driving circuit having a light emitting element and an EL element OLED which is a light emitting element. Although not shown outside the display area, various driving circuits and terminals connected to external power sources and electronic components are positioned. This display area is sealed to block outside air.

1 is an enlarged view of one of red, green, and blue pixels as one driving unit of an organic light emitting display device.

The TFT is not necessarily possible only with the structure shown in FIG. 1, and the number and structure can be variously modified. The active driving organic electroluminescent device will be described in more detail as follows.

As shown in Fig. 1, a buffer layer 11 is formed on a glass substrate 10, and the above-described TFT is provided on the buffer layer 11 above.

Substrate 10 may be a transparent glass material, in addition, acrylic, polyimide, polycarbonate, polyester, mylar and other plastic materials may be used. Of course, opaque materials may also be used.

The buffer layer 11 may be made of SiO 2 and / or SiN x to block the infiltration of impurity elements from the substrate 10, but is not limited thereto. The inorganic layer and the organic layer may be repeatedly stacked to penetrate moisture. It may be formed as a barrier layer to block the.

The TFT includes an active layer 12 formed on the buffer layer 11, a gate insulating film 13 formed on the active layer 12, a gate electrode 14 on the gate insulating film 13, and an active layer 12. And a source electrode 17 and a drain electrode 18 in contact with the source / drain region.

The active layer 12 may be formed of an amorphous silicon thin film or a polycrystalline silicon thin film, but is not limited thereto, and an organic semiconductor may be used. This semiconductor active layer has a source and a drain region.

The gate insulating layer 13 is provided on the active layer 12 by SiO 2 and / or SiNx, and other insulating materials. The predetermined region on the gate insulating layer 13 is formed of MoW, Al / Cu, other conductive polymers, or the like. The gate electrode 14 is formed of a conductive film. The gate electrode 14 is connected to a gate line for applying a TFT on / off signal. The region where the gate electrode 14 is formed corresponds to the channel region of the active layer 12.

An inter-insulator: 16 is formed on the gate electrode 12, and a source electrode 17 and a drain electrode 18 are formed on the interlayer insulating film 16. The source electrode 17 and the drain electrode 18 are in contact with the source region and the drain region of the active layer 12 through contact holes formed in the interlayer insulating layer 16, respectively.

An insulating film 20 is formed on the source and drain electrodes 17 and 18. The insulating film 20 may be thinly formed of an inorganic material such as SiO 2 and / or SiN x, and then formed of an organic material such as acrylic or polyimide. However, the present invention is not limited thereto, and may be formed in an organic or inorganic single layer structure.

At least one capacitor Cst is connected to the TFT, wherein one electrode 15 of the capacitor Cst is formed on the same layer as the gate electrode 14, and the other electrode 19 is a source of the TFT. It may be connected to the electrode 17. The structure of such a capacitor is not necessarily limited thereto, and may be variously modified.

Meanwhile, an organic light emitting diode OLED is connected to the drain electrode 18, and is connected to a pixel electrode 30 serving as an anode of the organic light emitting diode OLED. The pixel electrode 30 is formed on the insulating film 20, and an insulating pixel definition film 21 is formed on the pixel electrode 30, and a predetermined opening 22 is formed in the pixel definition film 21. After that, the organic light emitting film 31 is formed.

The organic light emitting diode (OLED) emits red, green, and blue light according to the flow of current to display predetermined image information, and is connected to the drain electrode 18 of the TFT and receives positive power therefrom. The pixel electrode 30 and the counter electrode 32 provided to cover all the pixels to supply negative power, and the organic light emitting film 31 disposed between the pixel electrodes 30 and the counter electrode 32 to emit light. It is composed of

The organic light emitting layer 31 may be a low molecular or high molecular organic layer. When the low molecular organic light emitting layer is used, a hole injection layer (HIL), a hole transport layer (HTL), and an emission layer (EML) are emitted. Layer, Electron Transport Layer (ETL), Electron Injection Layer (EIL), etc. can be formed by stacking single or complex structure. Usable organic materials are also copper phthalocyanine (CuPc) ), N, N-di (naphthalen-1-yl) -N, N'-diphenyl-benzidine (N, N'-Di (naphthalene-1-yl) -N, N'-diphenyl-benzidine: NPB) And tris-8-hydroxyquinoline aluminum (Alq3). These low molecular weight organic layers are formed by the vacuum deposition method.

In the case of the polymer organic light emitting film, it may have a structure generally provided with a hole transporting layer (HTL) and a light emitting layer (EML). Polymeric organic materials such as ore (Polyfluorene) are used and can be formed by screen printing or inkjet printing.

The pixel electrode 30 functions as an anode electrode, and the counter electrode 32 functions as a cathode electrode. Of course, the polarities of these pixel electrodes 30 and the counter electrodes 32 may be reversed.

The pixel electrode 30 may be provided as a transparent electrode or a reflective electrode. When used as a transparent electrode may be provided with ITO, IZO, ZnO, or In2O3, when used as a reflective electrode Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, and compounds thereof After the reflection film is formed, ITO, IZO, ZnO, or In 2 O 3 can be formed thereon.

The counter electrode 32 may also be provided as a transparent electrode or a reflective electrode. When the counter electrode 32 is used as a transparent electrode, since the counter electrode 32 is used as a cathode, a metal having a small work function, that is, Li, Ca, LiF / After depositing Ca, LiF / Al, Al, Mg, and compounds thereof to face the organic light emitting layer 31, the auxiliary electrode layer is formed thereon with a material for forming a transparent electrode such as ITO, IZO, ZnO, or In2O3. Or a bus electrode line can be formed. When used as a reflective electrode, Li, Ca, LiF / Ca, LiF / Al, Al, Mg, and compounds thereof are formed by depositing the entire surface.

As described above, the organic light emitting display device formed on the substrate 10 is sealed by a separate counter member (not shown). The counter member may be provided with a glass or plastic material in the same manner as the substrate 10. In addition, the opposing member may be formed with a metal cap or the like. In addition, the substrate 10 may be coated and sealed by a single or a composite material of a separate inorganic film / organic film.

Meanwhile, in the present invention, a separate conductive pattern 40 is further formed on the planarization film 20. The conductive pattern 40 may be formed of the same material as the pixel electrode 30 on the same layer as the pixel electrode 30, but is not limited thereto and may be formed on various layers.

The conductive pattern 40 may be spaced apart from the pixel electrode 30 by a predetermined interval, and as shown in FIG. 2, may be formed in a mesh shape.

When the conductive pattern 40 is formed of the same material as the pixel electrode 30, the pixel electrode 30 may be formed as a single layer when the pixel electrode 30 is a single layer, but the pixel electrode 30 is a reflective electrode as described above. When formed as a structure, only one of the layers may be employed in the conductive pattern 40.

As shown in FIG. 3, the conductive pattern 40 may be grounded by connecting the conductive patterns 40 of all pixels, and as shown in FIG. 4, the voltage sustain circuit including the xenodiode 43 may be formed. 41).

The voltage holding circuit 41 may include a genodiode 43 and a capacitor 42 connected in parallel to the genodiode 43. However, the voltage holding circuit 41 is not limited thereto. Applicable

By the ground or the voltage holding circuit 41, the conductive pattern 40 is in a constant constant voltage state, whereby image distortion by static electricity can be prevented.

A black pigment may be added or the black treatment may be performed to the conductive pattern 40 to improve contrast.

The present invention described above is not necessarily applied only to an organic light emitting display device, but may be applied to various flat panel display devices such as a liquid crystal display, an inorganic electroluminescent display, and an electron emission display.

As described above, according to the flat panel display of the present invention, image distortion due to static electricity can be prevented.

Moreover, contrast can be improved by black-processing a conductive pattern.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (7)

Board; A plurality of pixel electrodes formed on the substrate; And And a conductive pattern formed on the substrate to be insulated from the pixel electrode. And the conductive pattern is grounded. The method of claim 1, And the substrate includes a plurality of selection driving circuits electrically connected to each pixel electrode, wherein the selection driving circuit includes at least one thin film transistor and at least one storage capacitor. The method of claim 1, And the conductive pattern is formed of the same material as the pixel electrode. The method of claim 1, And the conductive pattern is on the same layer as the pixel electrode. The method of claim 1, And an insulating film covering the pixel electrode and the conductive pattern and exposing a predetermined region of the pixel electrode. delete The method of claim 1, And a voltage holding circuit including a xeno diode is electrically connected to the conductive pattern.

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