CN102393587A - Signal routing structure in GOA circuit for liquid crystal display - Google Patents

Abstract

The invention provides a signal routing structure in a GOA circuit of a liquid crystal display, which comprises: each first metal layer is provided with a control signal routing; an insulating layer formed below the first metal layer; the plurality of second metal layers are formed below the insulating layer, and the control signal routing on each first metal layer is electrically connected with the corresponding second metal layer through a plurality of through holes; the number of the through holes formed on the control signal routing line on each first metal layer is the same. By adopting the invention, the control signal line on each first metal layer is electrically connected with the second metal layer through the plurality of through holes, and the number of the through holes formed on the control signal line on each first metal layer is the same, so that the impedance values on all the control signal lines are ensured to be uniform, further the input signal and the output signal of each grade of GOA circuit are stable, and the image display quality is improved.

Description

Signal routing structure in GOA circuit for liquid crystal display

technical field

The invention relates to a GOA circuit of a liquid crystal display, in particular to a signal wiring structure for the GOA circuit.

Background technique

Currently, in an active matrix liquid crystal display (AMLCD, Active Matrix Liquid Crystal Display), each pixel has a thin film transistor (TFT, Thin Film Transistor), the gate of which is electrically connected to the horizontal scanning line, and the drain is electrically connected to the data line in the vertical direction, 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 the prior art, the driving circuit is mainly completed by bonding an IC outside the liquid crystal panel, and a CMOS process is used. In contrast, GOA technology (Gate driver OnArray, 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 TFT-LCD panel can be improved, and the panel tends to be thinner.

However, the traditional approach is to use double metal layers to reduce the impedance value as much as possible when routing GOA signals, and to use via holes at different signal crossing lines for electrical series connection. On the other hand, different numbers of via holes will cause the impedance mismatch of the signal traces. This is because, though the via holes can be used to electrically connect the upper and lower metal layers in series, although the impedance value can be reduced, the impedance of the via holes itself It is higher than that of a single metal layer. When the number of vias used by the signal line is larger, the impedance effect of the double-layer metal layer will be reduced instead. For example, the signal bus CK6 is located on the outer side farthest from the GOA circuit, and the number of times it is passed by other signal traces is the least, so the impedance value is the lowest; while the signal bus CK1 is located on the inner side closest to the GOA circuit, it is routed by other signals. The wire crosses the most times and thus has the highest impedance value. As a result, the impedances on the signal buses CK1-CK6 will be uneven, which will further affect the input and output of each stage of the GOA circuit, resulting in abnormal image display.

In view of this, how to design a signal routing structure in the GOA circuit of a liquid crystal display, so as to make the impedance on the above-mentioned signal bus uniform, improve the stability of the GOA circuit, and improve the image display quality, is a related technology in the industry. A problem that needs to be solved urgently.

Contents of the invention

Aiming at the above-mentioned defects of the signal wiring structure in the GOA circuit used for liquid crystal displays in the prior art, the present invention provides a new signal wiring structure.

According to one aspect of the present invention, a signal wiring structure in a GOA (Gate driver On Array, array substrate row drive) circuit for a liquid crystal display is provided, wherein the signal wiring structure includes:

A plurality of first metal layers arranged vertically, and each first metal layer has a control signal wiring;

an insulating layer formed under the first metal layer; and

A plurality of second metal layers arranged vertically and formed under the insulating layer, and the control signal wiring on each first metal layer and the corresponding second metal layer through a plurality of through holes electrical connection;

Wherein, the number of the through holes formed on the control signal traces on each of the first metal layers is the same.

Preferably, each of the plurality of first metal layers is coupled to a corresponding GOA circuit by a conductive connection line in a horizontal direction.

Preferably, the plurality of GOA circuits include a first GOA circuit and a second GOA circuit, and the plurality of first metal layers include a left metal layer and a right metal layer. More preferably, the first GOA circuit is electrically connected to the control signal trace on the left metal layer through a conductive connection line, and the second GOA circuit is electrically connected to the control signal line through another conductive connection line. The control signal routing on the right metal layer.

Preferably, the plurality of via holes on each first metal layer divides the corresponding first metal layer into N segments, where N is a natural number greater than or equal to 2. More preferably, in the horizontal direction, the corresponding segment positions of each first metal layer in the plurality of first metal layers are the same.

Preferably, the external dimensions of the through holes formed on the control signal traces on each of the first metal layers are the same.

Preferably, the plurality of GOA circuits are periodically coupled to corresponding first metal layers in the plurality of first metal layers through a conductive connection line.

Preferably, the horizontal routing direction of the conductive connection lines corresponds to the segmented positions where the through holes are formed.

Using the signal wiring structure in the GOA circuit of the liquid crystal display of the present invention, the control signal lines are arranged on a plurality of first metal layers, and a plurality of first metal layers are correspondingly arranged under each first metal layer through an insulating layer. Two metal layers, the control signal line on each first metal layer is electrically connected to the second metal layer through a plurality of through holes, wherein the number of through holes formed on the control signal line on each first metal layer If they are set to be the same, it can ensure that the impedance values of all control signal lines are uniform, thereby making the input signal and output signal of each stage of GOA circuit stable and improving the image display quality.

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 block diagram of a signal wiring structure in a GOA circuit for a liquid crystal display according to one aspect of the present invention.

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 block diagram of a signal routing structure used in a GOA (Gate driver On Array, array substrate row driver) circuit for a liquid crystal display according to one aspect of the present invention. Referring to FIG. 1 , the signal trace structure includes a plurality of first metal layers, an insulating layer and a plurality of second metal layers. Wherein, a plurality of first metal layers are arranged vertically, and each first metal layer has a control signal wiring, for example, the leftmost first metal layer in the figure has a control signal bus CLK3, and the middle A control signal bus CLK2 is provided on the first metal layer, and a control signal bus CLK1 is provided on the rightmost first metal layer. An insulating layer is formed under the first metal layer, and a plurality of second metal layers are formed under the insulating layer and arranged parallel to the first metal layer. Wherein, the control signal bus on each first metal layer is electrically connected to the corresponding second metal layer through a plurality of through holes, and the number of through holes of the control signal bus formed on each first metal layer is the same .

In a specific embodiment, each of the plurality of first metal layers is coupled to the corresponding GOA circuit by a conductive connection line in the horizontal direction. In detail, the control signal bus CLK1 is connected to the GOA circuit 1 (numeral reference 10 ) via an electrical connection line 101 . The control signal bus CLK2 is connected to the GOA circuit 2 (numbered 12 ) via an electrical connection line 121 , and the positions where the electrical connection line 121 intersects with the control signal bus lines CLK1 and CLK2 respectively include through holes. The control signal bus CLK3 is connected to the GOA circuit 3 (numbered 14 ) via an electrical connecting line 141 , and the positions where the electrical connecting line 141 intersects with the control signal buses CLK1 , CLK2 and CLK3 respectively include through holes.

In another specific embodiment, the plurality of via holes on each first metal layer divides the corresponding first metal layer into N segments, where N is a natural number greater than or equal to 2. 1, the control signal buses CLK1, CLK2 and CLK3 each include three through holes, namely, a through hole 161, a through hole 162 and a through hole 163, and these through holes can be used to divide the first metal layer where the control signal bus is located into two paragraphs. Preferably, in the horizontal direction, the corresponding segment positions of each of the first metal layers in the plurality of first metal layers are the same, that is to say, the through holes at the corresponding segment positions are on the same line in the horizontal direction. in a straight line.

In a specific embodiment, the external dimensions of the through holes formed on the control signal traces on each of the first metal layers are the same, so that the impedances of the through holes themselves on different control signal buses The values are basically the same.

In yet another specific embodiment, the plurality of GOA circuits are periodically coupled to corresponding first metal layers of the plurality of first metal layers through a conductive connecting line. In FIG. 1 , only three GOA circuits are schematically shown, but the present invention is not limited thereto. In other embodiments, GOA circuit 4 is similar to GOA circuit 1, coupled to control signal bus CLK1, GOA circuit 5 is similar to GOA circuit 2, coupled to control signal bus CLK2, GOA circuit 6 is similar to GOA circuit 3, coupled to Connected to the control signal bus CLK3.

Using the signal wiring structure in the GOA circuit of the liquid crystal display of the present invention, the control signal lines are arranged on a plurality of first metal layers, and a plurality of first metal layers are correspondingly arranged under each first metal layer through an insulating layer. Two metal layers, the control signal line on each first metal layer is electrically connected to the second metal layer through a plurality of through holes, wherein the number of through holes formed on the control signal line on each first metal layer If they are set to be the same, it can ensure that the impedance values of all control signal lines are uniform, thereby making the input signal and output signal of each stage of GOA circuit stable and improving the image display quality.

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 signal routing structure for a Gate driver On Array (GOA) circuit of a Liquid Crystal Display (LCD), the signal routing structure comprising:

the plurality of first metal layers are arranged along the vertical direction, and each first metal layer is provided with a control signal routing;

an insulating layer formed below the first metal layer; and

the plurality of second metal layers are arranged along the vertical direction and formed below the insulating layer, and the control signal routing on each first metal layer is electrically connected with the corresponding second metal layer through a plurality of through holes;

the number of the through holes formed on the control signal routing line on each first metal layer is the same.

2. The signal routing structure according to claim 1, wherein each of the plurality of first metal layers is coupled to the corresponding GOA circuit by a conductive connection line in a horizontal direction.

3. The signal routing structure according to claim 1, wherein the plurality of GOA circuits includes a first GOA circuit and a second GOA circuit, and the plurality of first metal layers includes a left metal layer and a right metal layer.

4. The signal routing structure according to claim 3, wherein the first GOA circuit is electrically connected to the control signal routing on the left metal layer by a conductive connection line, and the second GOA circuit is electrically connected to the control signal routing on the right metal layer by another conductive connection line.

5. The signal routing structure according to claim 1, wherein each of the plurality of vias on each of the first metal layers divides the corresponding first metal layer into N segments, where N is a natural number greater than or equal to 2.

6. The signal routing structure of claim 5, wherein the corresponding segment location of each of the plurality of first metal layers is the same in a horizontal direction.

7. The signal trace structure according to claim 1, wherein the through holes formed on the control signal traces on each of the first metal layers have the same outer dimension.

8. The signal routing structure according to claim 1, wherein the plurality of GOA circuits are periodically coupled to respective ones of the plurality of first metal layers by a conductive connection line.

9. The signal routing structure according to claim 1, wherein a horizontal routing direction of the conductive connection line corresponds to a segmented position formed by the through holes.

Images