CN203054411U - Array substrate and display device - Google Patents

Abstract

The utility model provides an array substrate and a display device and belongs to the display technical field. The array substrate comprises a substrate, a pattern of a common electrode on the substrate and an insulation layer. A conductive pattern connected with low level electric potential is formed on the substrate. An overlapping area exists among the conductive pattern, the insulation layer and the pattern of the common electrode to form a filtering capacitor. The array substrate and the display device can effectively improve the phenomenon that images are greenish in a display panel and improve quality of the images.

Description

Array substrate and display device

technical field

The utility model relates to the field of display technology, in particular to an array substrate and a display device.

Background technique

With the continuous advancement of flat panel display technology, liquid crystal displays have been widely used in display devices such as notebooks, detectors, and TVs.

For large-size full HD ADS (Advanced Super Dimension Switch, advanced ultra-dimensional field switching technology) panels, due to the high resolution and the large C _st of ADS pixels (storage capacitance between the pixel electrode and the common electrode), the display panel The load is relatively large, and the coupling between the data signal and the common electrode signal also increases, causing the common electrode signal to be pulled up by the data signal, and the phenomenon of V _com Level Shift as shown in Figure 1 appears. The distortion of the V _com signal will affect the normal operation of the pixel. Charge and discharge, which will eventually cause the phenomenon of greenish on the screen, especially the greenish phenomenon in the lower left corner of the display panel.

Utility model content

The technical problem to be solved by the utility model is to provide an array substrate and a display device, which can effectively improve the phenomenon of greening of the screen of the display panel and improve the quality of the screen.

In order to solve the problems of the technologies described above, the embodiments of the utility model provide technical solutions as follows:

In one aspect, an array substrate is provided, including a substrate and a pattern of a common electrode on the substrate and an insulating layer, wherein a conductive pattern connected to a low-level potential is formed on the substrate, and the conductive pattern, the insulating layer and the common electrode There are overlapping regions of the pattern to form filter capacitors.

Further, in the above solution, a grounded conductive pattern is formed on the gate insulating layer of the array substrate, and there is an overlapping area between the conductive pattern and the pattern of the common electrode.

Further, in the above solution, the conductive pattern is connected to the ground point of the gate drive circuit.

Further, in the above solution, the conductive pattern is formed by using a source-drain metal layer.

Further, in the above solution, the conductive pattern and the source electrode and the drain electrode of the array substrate are formed simultaneously through one patterning process.

The embodiment of the present invention also provides a display device, including the above-mentioned array substrate.

Embodiments of the utility model have the following beneficial effects:

In the above solution, a grounded conductive pattern is formed on the array substrate, and the conductive pattern, the insulating layer and the pattern of the common electrode have overlapping areas, so that capacitance can be formed between the conductive pattern and the common electrode, and the signal of the common electrode can be filtered , thereby reducing the V _com Level Shift caused by the coupling of the data signal and the common electrode signal, making the common electrode signal tend to be stable, and finally achieving the purpose of reducing the greenish phenomenon of the picture and improving the picture quality of the display panel.

Description of drawings

Figure 1 is a schematic diagram of the V _com Level Shift phenomenon when the common electrode signal is pulled up by the data signal;

FIG. 2 is a schematic structural view of a liquid crystal display device according to an embodiment of the present invention;

Fig. 3 is a schematic plan view of the overlapping of the conductive pattern and the common electrode in the embodiment of the utility model;

Fig. 4 is a schematic cross-sectional view of the overlapping of the conductive pattern and the common electrode in the embodiment of the utility model;

Fig. 5 is the equivalent circuit diagram of the filter capacitance of the utility model embodiment;

FIG. 6 is a schematic diagram of common electrode signals before and after filtering according to an embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

The embodiment of the utility model aims at the problem that the common electrode signal is pulled up by the data signal in the prior art, and the phenomenon of V _com Level Shift occurs, and the distortion of the V _com signal affects the normal charging and discharging of the pixels, thereby finally causing the phenomenon of greening of the screen, and provides a solution. An array substrate, a manufacturing method thereof, and a display device can effectively improve the phenomenon of greening of a display panel image and improve the image quality.

The array substrate of the present utility model includes the substrate and the pattern of the common electrode on the substrate and an insulating layer, wherein a conductive pattern connected to a low-level potential is formed on the substrate, and the conductive pattern, the insulating layer and the pattern of the common electrode have a overlapping areas to form filter capacitors.

The array substrate of the present invention filters the common electrode signal by forming a filter capacitor between the conductive pattern and the common electrode, thereby reducing the V _com Level Shift caused by the coupling of the data signal and the common electrode signal, and making the common electrode signal tend to be stable , and finally achieve the purpose of reducing the phenomenon of greening of the picture, and improve the picture quality of the display panel.

The array substrate of the present invention can be a top-gate structure or a bottom-gate structure. When the array substrate of the present invention is a top-gate structure, the conductive pattern can be formed by a gate metal layer, the conductive pattern, the gate insulating layer There is an overlapping area with the pattern of the common electrode to form a filter capacitor; when the array substrate of the present invention is a bottom gate structure, the conductive pattern can be formed by the source-drain metal layer, and the pattern of the conductive pattern, the gate insulating layer and the common electrode exists overlapping areas to form filter capacitors.

Furthermore, the array substrate of the present invention is not limited to using the gate insulating layer to form the insulating layer of the filter capacitor, as long as the insulating layer between the conductive pattern and the common electrode pattern can be used to form the insulating layer of the filter capacitor.

Furthermore, the array substrate of the present invention is not limited to a horizontal electric field type array substrate, and may also be a vertical electric field type array substrate, as long as a filter capacitor can be formed between the conductive pattern connecting the low point and the pattern of the common electrode .

Specifically, when the array substrate of the present invention is a bottom-gate array substrate, the gate metal layer can be used to form the pattern of the common electrode, and then a conductive pattern connected to a low-level potential is formed on the gate insulating layer. The conductive pattern There is an overlapping area with the pattern of the common electrode. Wherein, the conductive pattern may be connected to the ground point of the gate driving circuit.

Further, the conductive pattern can be formed using a source-drain metal layer, so that the source electrode, drain electrode and conductive pattern of the array substrate can be formed through one patterning process, and the technology of the utility model can be realized without increasing the number of patterning processes plan.

Further, taking the bottom gate structure of the array substrate of the present invention as an example, the array substrate of the present invention may specifically include:

Substrate;

Patterns of common electrodes, gate electrodes and gate lines formed by the gate metal layer on the substrate;

a gate insulating layer located on the substrate on which the common electrode, gate electrode, and gate line are formed;

The conductive pattern, the pattern of the source electrode and the pattern of the drain electrode are formed by the source-drain metal layer on the gate insulating layer.

Preferably, it may also include a pattern forming a data line.

Further, after forming the required filter capacitors, the pixel electrodes required by the array substrate can also be fabricated, specifically including:

The pattern of the insulating layer including the pixel electrode via hole on the substrate formed with the conductive pattern, source electrode, drain electrode and data line;

A pattern of a pixel electrode composed of a transparent conductive layer located on the insulating layer, and the pixel electrode is connected to the drain electrode through the pixel electrode via hole.

The embodiment of the present utility model also provides a method for manufacturing the above-mentioned array substrate, the array substrate includes a substrate and a common electrode pattern and an insulating layer on the substrate, wherein the manufacturing method includes: forming a connection on the substrate A conductive pattern with a low level potential, the conductive pattern, the insulating layer and the pattern of the common electrode have an overlapping area to form a filter capacitor.

The array substrate of the present invention can be a top-gate structure or a bottom-gate structure. When the array substrate of the present invention is a top-gate structure, the gate metal layer can be used to form a conductive pattern, so that the conductive pattern, the gate insulating layer There is an overlapping area with the pattern of the common electrode to form a filter capacitor; when the array substrate of the present invention is a bottom-gate structure, the source-drain metal layer can be used to form a conductive pattern, so that the pattern of the conductive pattern, the gate insulating layer and the common electrode There are overlapping regions to form filter capacitors. Furthermore, the array substrate of the present invention is not limited to using the gate insulating layer to form the insulating layer of the filter capacitor, as long as the insulating layer between the conductive pattern and the common electrode pattern can be used to form the insulating layer of the filter capacitor.

Further, the array substrate of the present invention is not limited to a horizontal electric field type array substrate, and may also be a vertical electric field type array substrate, as long as a conductive pattern connecting the low points can be formed, so that the conductive pattern and the pattern of the common electrode are formed filter capacitor.

Specifically, when the array substrate of the present invention is a bottom-gate array substrate, the gate metal layer can be used to form the pattern of the common electrode, and then a conductive pattern connected to a low-level potential is formed on the gate insulating layer. The conductive pattern There is an overlapping area with the pattern of the common electrode. Specifically, the conductive pattern connected to the ground point of the gate driving circuit may be formed on the gate insulating layer. .

Further, in order not to increase the number of patterning processes, a source-drain metal layer can be used to form a conductive pattern, and the conductive pattern and the source electrode and drain electrode of the array substrate can be formed simultaneously through one patterning process.

Further, taking the bottom-gate structure of the array substrate of the present invention as an example, the manufacturing method specifically includes:

providing a substrate;

Through the first patterning process, a pattern of common electrodes, gate electrodes and gate lines composed of a gate metal layer is formed on the substrate;

Through the second patterning process, the gate insulating layer and the conductive pattern composed of the source and drain metal layers, the pattern of the drain electrode and the source electrode are formed on the substrate after the first patterning process. Preferably, a pattern for forming data lines is also included.

Further, after forming the required filter capacitors, the pixel electrodes required by the array substrate can also be fabricated, specifically including:

Through a third patterning process, a pattern of an insulating layer including pixel electrode via holes is formed on the substrate that has undergone the second patterning process;

Through the fourth patterning process, a pattern of a pixel electrode composed of a transparent conductive layer is formed on the insulating layer, and the pixel electrode is connected to the drain electrode through the pixel electrode via hole.

In the manufacturing method of the array substrate of the present invention, the conductive pattern and the common electrode are formed at the same time as the TFT (thin film transistor) of the array substrate is made, and the common electrode is controlled by the filter capacitance formed between the conductive pattern and the common electrode. The signal is filtered to reduce the V _com Level Shift caused by the coupling of the data signal and the common electrode signal, so that the common electrode signal tends to be stable, and finally achieve the purpose of reducing the green phenomenon of the screen and improving the picture quality of the display panel.

The array substrate of the present invention is introduced in detail below in conjunction with accompanying drawings 2-5:

Figure 2 is a schematic structural diagram of the display panel. As shown in Figure 2, there are ground signals in the X-Y1, Y1-Y2, and Y2-Y3 areas, but there is no ground signal access in the A area in the lower left corner. For large-size full-HD ADS panels, due to the high resolution (for example: 1920*1080) and the large C _st of ADS pixels, the load on the display panel is relatively large, and the coupling of data signals and common electrode signals also increases. As a result, the common electrode signal is pulled up by the data signal, and the V _com Level Shift phenomenon appears as shown in Figure 1. The distortion of the V _com signal will affect the normal charging and discharging of the pixels, which will eventually cause the greenish phenomenon of the screen, and the lower left corner of the display panel The green phenomenon of the screen is particularly serious.

Generally speaking, charges will move under force in an electric field. When there is a medium between conductors, it will hinder the movement of charges and cause charges to accumulate on the conductors, resulting in the accumulation and storage of charges, thus forming capacitance. According to the function of capacitors, capacitors can be divided into coupling capacitors, filter capacitors, bypass capacitors, decoupling capacitors, compensation capacitors, and bootstrap capacitors. The technical solution of the utility model forms a filter between the low-level signal and the common electrode. Capacitors are used to filter the common electrode signal, so that the common electrode signal tends to be stable, and finally achieve the purpose of reducing the green phenomenon of the picture and improving the picture quality of the display panel.

As shown in Figure 2, in the embodiment of the present invention, preferably, a conductive pattern connected to a low-level potential can be formed in the non-display area of the lower left corner of the display device, so that the display effect will not be affected, and the lower left of the display panel can be significantly improved. corners of the screen appear green.

Specifically, the ground signal is transmitted from the PCB (printed circuit board) to the data drive circuit, and then transmitted to the gate drive circuit through the gate layer metal wire, and the ground signal is taken out as a low-level signal at the end of the gate drive circuit.

Taking the bottom-gate structure as an example, the embodiments of the present invention can use the source-drain metal layer to form a grounded conductive pattern on the gate insulating layer. As shown in Figures 3 and 4, there is a pattern of common electrodes 1 formed by a gate metal layer on the substrate 4, a gate insulating layer 5 is formed on the pattern of the common electrodes 1, and a connection low is formed on the gate insulating layer 5. Conductive pattern 2 of level potential. The conductive pattern 2 can be connected to the ground pin of the gate drive circuit. Specifically, the ground signal is transmitted from the PCB (printed circuit board) to the data drive circuit, and then transmitted to the gate drive circuit through the gate layer metal wire. The end of the pole drive circuit leads out the ground signal as a low level signal.

It can be seen from Figures 3 and 4 that there is an overlapping region 3 between the conductive pattern 2 and the pattern of the common electrode 1 formed by the gate metal layer, and the gate insulating layer between the source-drain metal layer and the gate metal layer is a dielectric, In this way, a filter capacitor can be formed in the overlapping region 3 to filter the common electrode signal. The equivalent circuit diagram of the filter capacitor is shown in Figure 5, where V _com is the common electrode signal, and the resistance R is the equivalent resistance of the filter capacitor, which is also the resistance of the V _com line. The discharge time constant of the capacitor (t=RC) is shorter The larger the value, the slower the discharge, the higher the output voltage, and the less the pulsating component, that is, the better the filtering effect. Generally speaking, the resistance R of the V _com line in the display device is fixed, so the filtering effect can be adjusted by adjusting the size of the capacitor C. The size of the filter capacitor C can be controlled by changing the area of the overlapping area 3, C=εS/d, where C is the size of the filter capacitor, ε is the dielectric constant, S is the area of the overlapping area 3, and d is the grid The thickness of the insulating layer.

The left side of Figure 6 is a schematic diagram of the common electrode signal before filtering, and the right side of Figure 6 is a schematic diagram of the common electrode signal after filtering. It can be seen from Figure 6 that by setting the conductive pattern 2, the common electrode signal can be made to It is more stable, and finally achieves the purpose of reducing the green phenomenon of the picture and improving the picture quality of the display panel.

When the array substrate of the present invention has a top-gate structure, the gate metal layer can be used to form a conductive pattern, so that the pattern of the conductive pattern, the gate insulating layer and the common electrode overlap to form a filter capacitor.

Exemplarily, the present utility model also provides a method for manufacturing an array substrate. Firstly, a pattern of the common electrode 1 is formed by using a gate metal layer through a patterning process, and then a gate insulating layer is deposited on the substrate 4 formed with the pattern of the common electrode 1 5. The above steps are the same as the manufacturing process in the prior art, and will not be repeated here. Afterwards, when forming the source electrode and the drain electrode of the array substrate, the conductive pattern 2 connected to the ground point of the gate drive circuit is formed on the gate insulating layer of the non-display area by using the same patterning process, wherein the conductive pattern 2 and the common electrode 1 exist The overlapping region 3 is not connected to the source electrode and the drain electrode, so that a filter capacitance can be formed between the conductive pattern 2 and the common electrode 1 . The area and position of the conductive pattern 2 can be adjusted according to the actual situation. For example, the conductive pattern 2 can be set in the place where the screen is more green, and the overlapping area of the conductive pattern 2 and the common electrode 1 can also be adjusted according to the needs of the filtering effect. 3 area size.

The embodiment of the present utility model also provides a display device, comprising the thin film field effect transistor array substrate as described above. The display device can be: liquid crystal panel, electronic paper, OLED (Organic Light Emitting Diode, organic light emitting diode) panel, liquid crystal TV, liquid crystal display, digital photo frame, mobile phone, tablet computer and other products or components with any display function.

The foregoing is a preferred embodiment of the present utility model, and it should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the present utility model. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (6)

1. An array substrate, comprising a substrate and a common electrode pattern and an insulating layer on the substrate, characterized in that, the substrate is formed with a conductive pattern connected to a low-level potential, and the conductive pattern, the insulating layer and the common electrode There are overlapping regions of the pattern to form filter capacitors. 2 . The array substrate according to claim 1 , wherein a grounded conductive pattern is formed on the gate insulating layer of the array substrate, and there is an overlapping area between the conductive pattern and the pattern of the common electrode. 3. The array substrate according to claim 2, wherein the conductive pattern is connected to a ground point of the gate driving circuit. 4. The array substrate according to claim 1, wherein the conductive pattern is formed using a source-drain metal layer. 5 . The array substrate according to claim 3 , wherein the conductive pattern and the source electrode and the drain electrode of the array substrate are formed simultaneously through one patterning process. 6. A display device, comprising the array substrate according to any one of claims 1-5.

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