CN103926719A - Display panel with electrostatic protection function - Google Patents

Abstract

The invention provides a display panel with electrostatic protection function, comprising: the array substrate is provided with a display area and a peripheral area; the color filter substrate is arranged opposite to the array substrate and corresponds to the display area of the array substrate; the first metal layer is positioned in the peripheral area and is provided with a signal wire which is coupled to the inside of the color filter substrate; the second metal layer is positioned below the first metal layer; and an electrostatic protection structure located in the peripheral region and electrically coupled to the first metal layer. When static electricity appears on the array substrate, the static electricity is released to the peripheral area in advance by the breakdown of the static electricity protection structure. Compared with the prior art, the invention releases the static electricity on the array substrate to the peripheral area in advance through the static electricity protection structure, thereby avoiding the situation that the static electricity enters the color filter substrate to cause the short circuit between the metal layer and the common electrode, and protecting the key circuit, the polaroid and other optical elements in the panel.

Description

A display panel with electrostatic protection function

technical field

The invention relates to an electrostatic protection technology, in particular to a display panel with an electrostatic protection function.

Background technique

At present, the liquid crystal panel mainly includes a thin film transistor array substrate (Thin Film Transistor Array Substrate) and a color filter substrate (Color Filter Substrate) which are oppositely arranged. Wherein, the thin film transistor array substrate includes a pixel array, each pixel in the pixel array has a thin film transistor (TFT, Thin Film Transistor), the gate of which is electrically connected to the scanning line in the horizontal direction, and the drain is electrically connected to The data line is vertical, and the source is electrically connected to the pixel electrode. If enough positive voltage is applied to a scanning line in the horizontal direction, all the TFTs on the scanning line will be turned on. At this time, the pixel electrode corresponding to the scanning line will be connected to the data line in the vertical direction, and the data line will be The video signal voltage is written into the pixel, so as to control the light transmittance of different liquid crystals and achieve the effect of controlling the color.

In addition, GOA technology (Gate driver On Array, array substrate row drive technology) is a technology that directly manufactures the gate drive circuit on the array substrate to replace the driver chip made by an external silicon chip. Since the GOA circuit can be directly fabricated around the panel, the manufacturing process is simplified, the product cost can be reduced, the integration degree of the liquid crystal panel can be improved, and the panel tends to be thinner.

In the prior art, in order to achieve electrostatic protection, a solution is to bridge a one-way diode at the junction area between the first metal layer and the second metal layer of the array substrate, and then connect to the color filter through the one-way diode. The common electrode on the light sheet substrate is used to prevent static electricity from flowing into the color filter substrate and causing damage to important circuits. However, judging from the current protection status, about 2kV will cause the one-way diode to be damaged at the overlap of the two metal layers, which will cause a short circuit between the second metal layer and the common electrode of the color filter substrate. Cause abnormal panel display or high temperature burnt polarizer.

In view of this, how to design a new display panel that realizes electrostatic protection to eliminate the above-mentioned existing defects is a problem to be solved urgently by the relevant technical personnel.

Contents of the invention

Aiming at the above-mentioned defects in the electrostatic protection design of the display panel in the prior art, the present invention provides a novel display panel. With the display panel, it can successfully release the static electricity generated on the array substrate in the peripheral area outside the display area, so as to prevent the static electricity from entering the color filter substrate and damaging key circuits.

According to one aspect of the present invention, a display panel with electrostatic protection function is provided, including:

An array substrate with a display area and a peripheral area;

A color filter substrate, arranged opposite to the array substrate, and the color filter substrate corresponds to the display area of the array substrate;

a first metal layer located in the peripheral area, the first metal layer has a signal trace, and the signal trace is electrically coupled to the inside of the color filter substrate;

a second metal layer located below the first metal layer; and

An electrostatic protection structure is located in the peripheral area and is electrically coupled to the first metal layer. When static electricity occurs on the array substrate, the static electricity is released to the peripheral area in advance by the collapse of the electrostatic protection structure.

In one embodiment, the electrostatic protection structure is an S-shaped loop.

In one embodiment, the materials of the first metal layer and the second metal layer are both transparent conductive materials.

In one embodiment, the transparent conductive material is indium tin oxide.

In one embodiment, the array substrate further includes a gate insulating layer, located between the first metal layer and the second metal layer, for electrically isolating the first metal layer and the second metal layer.

In one embodiment, the peripheral area of the array substrate further includes a GOA (Gate driver On Array, array substrate row driver) circuit, and one end of the signal wiring of the first metal layer is electrically coupled to the GOA circuit The other end is electrically coupled to the common electrode of the color filter substrate.

In one embodiment, the common electrode is fully coated on the surface of the color filter substrate facing the array substrate.

In one embodiment, the materials of the common electrodes are all transparent conductive materials.

In one embodiment, the transparent conductive material is indium tin oxide.

According to the display panel with electrostatic protection function of the present invention, the array substrate has a display area and a peripheral area, the color filter substrate is arranged opposite to the array substrate, and corresponds to the display area of the array substrate, and the first metal layer has a The signal traces are electrically coupled to the inside of the color filter substrate, the second metal layer is located under the first metal layer, and the electrostatic protection structure is located in the peripheral area and electrically coupled to the first metal layer. When static electricity occurs on the array substrate, the static electricity is released to the peripheral area in advance through the collapse of the static electricity protection structure. Compared with the prior art, the present invention releases the static electricity on the array substrate to the peripheral area in advance through the static electricity protection structure, thereby avoiding the short circuit between the metal layer and the common electrode caused by the static electricity entering the inside of the color filter substrate, so as to protect the panel Key circuits and optical components such as polarizers inside.

Description of drawings

Readers will have a clearer understanding of various aspects of the present invention after reading the detailed description of the present invention with reference to the accompanying drawings. in,

FIG. 1 shows a schematic diagram of an electrostatic blast between a first metal layer and a second metal layer in an array substrate of a display panel;

FIG. 2 shows a schematic structural view of a display panel with electrostatic protection function according to an embodiment of the present invention; and

FIG. 3 shows a preferred embodiment of the electrostatic protection structure in the display panel of FIG. 2 .

Detailed ways

In order to make the technical content disclosed in this application more detailed and complete, reference may be made to the drawings and the following various specific embodiments of the present invention, and the same symbols in the drawings represent the same or similar components. However, those skilled in the art should understand that the examples provided below are not intended to limit the scope of the present invention. In addition, the drawings are only for schematic illustration and are not drawn according to their original scale.

The specific implementation manners of various aspects of the present invention will be further described in detail below with reference to the accompanying drawings.

FIG. 1 shows a schematic diagram of electrostatic damage occurring between a first metal layer and a second metal layer in an array substrate of a display panel. Referring to FIG. 1 , in the prior art, a GOA circuit includes a signal transfer structure including a first metal layer M1 , a gate insulating layer GI and a second metal layer M2 . Wherein, the first metal layer M1 may be a first conductive layer used as a gate line. The second metal layer M2 may be a second conductive layer used as a data line.

Specifically, under the condition of charge distribution, the sharp corner portion P of the first metal layer M1 has a strong electric field. Since the thickness of the gate insulating layer GI is relatively thin at the sharp corner part P, electrostatic damage is easily generated there. As mentioned above, most of the existing solutions are to bridge a one-way diode at the junction area between the first metal layer and the second metal layer of the array substrate, and then connect to the color filter through the one-way diode The common electrode on the substrate uses the unidirectional conductivity of the diode to prevent static electricity from flowing into the color filter substrate and causing damage to important circuits or optical components. However, even if an ESD (Electro-Static Discharge) diode is used, the one-way diode will still be broken down when the electrostatic voltage is higher than about 2kV, causing a short circuit between the second metal layer and the common electrode of the color filter substrate, resulting in The panel display is abnormal or the high temperature burns the polarizer.

FIG. 2 shows a schematic structural view of a display panel with electrostatic protection function according to an embodiment of the present invention. FIG. 3 shows a preferred embodiment of the electrostatic protection structure in the display panel of FIG. 2 .

2 and 3, the display panel of the present invention includes an array substrate 10, a color filter substrate 20, a first metal layer 105, a second metal layer 109 and an electrostatic protection structure 107 (as shown in FIG. 3 shown by the bold line). In one embodiment, the ESD protection structure 107 is an "S"-shaped loop.

In detail, the array substrate 10 has a display area and a peripheral area 101 . The color filter substrate 20 is disposed opposite to the array substrate 10 , and the color filter substrate 20 corresponds to the display area of the array substrate 10 . The first metal layer 105 is located in the peripheral area 101 of the array substrate 10 . The first metal layer 105 has a signal wire (not shown), and the signal wire is electrically coupled to the interior of the color filter substrate. The ESD protection structure 107 is located in the peripheral area 101 and is electrically coupled to the first metal layer 105 . When static electricity occurs on the array substrate 10 , the static electricity is released to the peripheral area 101 in advance by the collapse of the static electricity protection structure 107 , thereby preventing the static electricity from entering the color filter substrate 20 (or the display area of the array substrate 10 ).

In a specific embodiment, the materials of the first metal layer 105 and the second metal layer 109 are both transparent conductive materials. For example, the transparent conductive material is indium tin oxide (ITO).

In a specific embodiment, the peripheral area 101 of the array substrate 10 further includes a GOA circuit 103 . One end of the signal wire of the first metal layer 105 is electrically coupled to the bonding lead portion of the GOA circuit, and the other end is electrically coupled to the common electrode of the color filter substrate 20 . For example, the entire layer of the common electrode is coated on the surface of the color filter substrate 20 facing the array substrate 10 . Similarly, the materials of the common electrodes are all transparent conductive materials, such as indium tin oxide (ITO).

According to the display panel with electrostatic protection function of the present invention, the array substrate has a display area and a peripheral area, the color filter substrate is arranged opposite to the array substrate, and corresponds to the display area of the array substrate, and the first metal layer has a The signal traces are electrically coupled to the inside of the color filter substrate, the second metal layer is located under the first metal layer, and the electrostatic protection structure is located in the peripheral area and electrically coupled to the first metal layer. When static electricity occurs on the array substrate, the static electricity is released to the peripheral area in advance through the collapse of the static electricity protection structure. Compared with the prior art, the present invention releases the static electricity on the array substrate to the peripheral area in advance through the static electricity protection structure, thereby avoiding the short circuit between the metal layer and the common electrode caused by the static electricity entering the inside of the color filter substrate, so as to protect the panel Key circuits and optical components such as polarizers inside.

Hereinbefore, specific embodiments of the present invention have been described with reference to the accompanying drawings. However, those skilled in the art can understand that without departing from the spirit and scope of the present invention, various changes and substitutions can be made to the specific embodiments of the present invention. These changes and substitutions all fall within the scope defined by the claims of the present invention.

Claims (9)

1. A display panel with electrostatic protection function, characterized in that, the display panel comprises: An array substrate with a display area and a peripheral area; A color filter substrate, arranged opposite to the array substrate, and the color filter substrate corresponds to the display area of the array substrate; a first metal layer located in the peripheral area, the first metal layer has a signal trace, and the signal trace is electrically coupled to the inside of the color filter substrate; a second metal layer located below the first metal layer; and An electrostatic protection structure is located in the peripheral area and is electrically coupled to the first metal layer. When static electricity occurs on the array substrate, the static electricity is released to the peripheral area in advance by the collapse of the electrostatic protection structure. 2. The display panel according to claim 1, wherein the electrostatic protection structure is an S-shaped loop. 3 . The display panel according to claim 1 , wherein materials of the first metal layer and the second metal layer are both transparent conductive materials. 4. The display panel according to claim 3, wherein the transparent conductive material is indium tin oxide. 5. The display panel according to claim 1, wherein the array substrate further comprises a gate insulating layer, located between the first metal layer and the second metal layer, for electrically isolating the first metal layer and the second metal layer. 6. The display panel according to claim 1, wherein the peripheral area of the array substrate further comprises an array substrate row driving circuit, and one end of the signal trace of the first metal layer is electrically coupled to the The other end of the wire bonding portion of the row driving circuit of the array substrate is electrically coupled to the common electrode of the color filter substrate. 7 . The display panel according to claim 6 , wherein the common electrode is coated in a whole layer on the surface of the color filter substrate facing the array substrate. 8. The display panel according to claim 6, wherein the materials of the common electrodes are all transparent conductive materials. 9. The display panel according to claim 8, wherein the transparent conductive material is indium tin oxide.