WO2016090732A1

WO2016090732A1 - Array substrate and display device

Info

Publication number: WO2016090732A1
Application number: PCT/CN2015/070934
Authority: WO
Inventors: 陈政鸿; 王醉
Original assignee: 深圳市华星光电技术有限公司
Priority date: 2014-12-10
Filing date: 2015-01-16
Publication date: 2016-06-16
Also published as: CN104407482A; CN104407482B

Abstract

Provided is an array substrate comprising a plurality of subpixel cells in an array arrangement, each subpixel cell comprising a main pixel region, a subpixel region, and a voltage-dividing capacitor (3); the subpixel region comprises a subpixel electrode (2); the voltage-dividing capacitor (3) comprises a voltage-dividing terminal electrode (31) and a common terminal electrode (32); a transparent electrically conductive structure (4) is arranged between the subpixel electrode (2) and the voltage-dividing terminal electrode (31); the electrically conductive structure (4) is electrically connected to the common terminal electrode (32); the subpixel electrode (2), voltage-dividing terminal electrode (31), and transparent electrically conductive structure (4) are located in the same layer and are insulated from each other.

Description

Array substrate and display device

The present application claims priority to Chinese Patent Application No. CN201410753408.6, filed on Dec. 10, 2014, which is hereby incorporated by reference.

Technical field

The present invention relates to the field of display technologies, and in particular to an array substrate and a display device.

Background technique

When a conventional liquid crystal display panel is viewed at a large viewing angle, a color shift phenomenon tends to occur, that is, the image viewed by the user at a large viewing angle is deviated from the color of the image viewed from the front viewing angle. This is because the sub-pixel units of the conventional liquid crystal display panel are an entire area, and different viewing angles can only see the long axis or the short axis of the liquid crystal molecules. The liquid crystal molecules have anisotropy and different refractive indices in different directions, so that the image viewed from a large viewing angle and the image in front view have a color shift.

In order to improve the color shift phenomenon of the vertical alignment type (VA) liquid crystal display panel at a large viewing angle, each sub-pixel unit can be divided into two regions of a main pixel region and a sub-pixel region, and a voltage dividing capacitor is further added. At the time of display, the main pixel electrode 1 and the sub-pixel electrode 2 are first charged to the same potential, and then the potential of the sub-pixel electrode 2 is lowered by the voltage dividing capacitor 3. The different potentials make the liquid crystal molecules in the two regions turn differently, thereby achieving the purpose of improving the large-view role of the VA liquid crystal display panel.

As shown in FIG. 1, the voltage dividing capacitor 3 specifically includes a voltage dividing terminal electrode 31 formed of a transparent electrode in the same layer as the main pixel electrode 1 and the subpixel electrode 2, a common terminal electrode 32, and an insulating layer therebetween. In order to ensure that the voltage dividing capacitor 3 can operate normally, the voltage dividing terminal electrode 31 is not in contact with the subpixel electrode 2 to achieve insulation between the two. However, the inventors have found that a problem of residual transparent electrodes may occur in the production of an actual liquid crystal display panel, resulting in short-circuiting of the divided-end terminal electrode 31 and the sub-pixel electrode 2. This will make the brightness of the sub-pixel region of the sub-pixel unit having the short-circuit problem coincide with the main pixel region, and exhibit a micro-brightness phenomenon on the liquid crystal display panel. The commonly used detection method is to simultaneously deliver the gate driving signals to all the scanning lines, so that all the sub-pixel units are simultaneously charged, so that the brightness of the main pixel area and the sub-pixel area are equal. Obviously, this detection method cannot effectively detect the problem that the voltage dividing terminal electrode 31 and the sub-pixel electrode 2 are short-circuited, resulting in a decrease in the yield of the liquid crystal display panel and an increase in cost.

Summary of the invention

An object of the present invention is to provide an array substrate and a display device to solve the technical problem that the prior art cannot effectively detect a short circuit between the divided terminal electrode and the sub-pixel electrode.

A first aspect of the present invention provides an array substrate, the array substrate includes a plurality of arrays of sub-pixel units, each of the sub-pixel units including a main pixel area, a sub-pixel area, and a voltage dividing capacitor;

The sub-pixel region includes a sub-pixel electrode, and the voltage dividing capacitor includes a voltage dividing end electrode and a common terminal electrode, and a transparent conductive structure is disposed between the sub-pixel electrode and the voltage dividing end electrode, and the transparent conductive structure The common terminal electrode is electrically connected, and the sub-pixel electrode, the voltage dividing terminal electrode and the transparent conductive structure are located in the same layer and insulated from each other.

Wherein, an insulating layer is disposed between the transparent conductive structure and the common terminal electrode, and the transparent conductive structure is electrically connected to the common terminal electrode through a via hole on the insulating layer.

Each of the sub-pixel units is provided with a driving scan line, a divided scan line, and a data line.

Wherein, each sub-pixel unit is further provided with a first switch tube, a second switch tube and a third switch tube;

a gate of the first switch tube is connected to the driving scan line, a source is connected to the data line, and a drain is connected to the main pixel electrode;

a gate of the second switch tube is connected to the driving scan line, a source is connected to the data line, and a drain is connected to the sub-pixel electrode;

The gate of the third switching transistor is connected to the voltage dividing scan line, the source is connected to the sub-pixel electrode, and the drain is connected to the voltage dividing terminal electrode.

The first switch tube, the second switch tube, and the third switch tube are thin film transistors.

Wherein the distance between the sub-pixel region and the voltage dividing terminal electrode is at least 4 micrometers.

Wherein, the sub-pixel electrode, the voltage dividing terminal electrode and the transparent conductive structure are formed in the same patterning process.

The area ratio of the sub-pixel region to the main pixel region is 6:4, 5:5, or 4:6.

The present invention has the following beneficial effects: In the technical solution of the embodiment of the present invention, an array substrate is provided, the array substrate includes a plurality of sub-pixel units arranged in an array, and each sub-pixel unit includes a main pixel area and a second Pixel area and voltage divider capacitor. A transparent conductive structure electrically connected to the common terminal electrode is disposed between the sub-pixel electrode and the voltage dividing terminal electrode, and the sub-pixel electrode, the voltage dividing terminal electrode and the transparent conductive structure are located in the same layer and are insulated from each other. If the transparent conductive material remains, the voltage dividing terminal electrode and the transparent conductive structure may be short-circuited, or the transparent conductive structure and the sub-pixel electrode may be short-circuited, or the voltage dividing terminal electrode, the transparent conductive structure and the sub-pixel electrode may be short-circuited. The potential of the pixel electrode is equal to the potential of the common terminal electrode. When using the existing detection method for detection, the brightness of the sub-pixel unit with the short circuit problem will be low. The brightness of the remaining sub-pixel units exhibits a dark spot condition and is easy to detect.

A second aspect of the present invention provides a display device including a color filter substrate and the above array substrate.

Wherein, the display device is a vertical alignment type display device.

Other features and advantages of the invention will be set forth in the description which follows, The objectives and other advantages of the invention may be realized and obtained by means of the structure particularly pointed in the appended claims.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, a brief description of the drawings required in the description of the embodiments will be briefly made below:

1 is a schematic structural view of a sub-pixel unit of a prior art array substrate;

2 is a schematic structural diagram of a sub-pixel unit of an array substrate according to an embodiment of the present invention;

FIG. 3 is an equivalent circuit diagram of a sub-pixel unit of an array substrate according to an embodiment of the present invention.

detailed description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and embodiments, in which the present invention can be applied to the technical problems, and the implementation of the technical effects can be fully understood and implemented. It should be noted that the various embodiments of the present invention and the various features of the various embodiments may be combined with each other, and the technical solutions formed are all within the scope of the present invention.

An array substrate provided by an embodiment of the present invention includes a plurality of sub-pixel units arranged in an array. Each of the sub-pixel units includes a main pixel region, a sub-pixel region, and a voltage dividing capacitor 3.

Specifically, as shown in FIG. 2, the main pixel region includes a main pixel electrode 1, the sub-pixel region includes a sub-pixel electrode 2, and the voltage dividing capacitor 3 includes a divided terminal electrode 31 and a common terminal electrode 32. A transparent conductive structure 4 is disposed between the sub-pixel electrode 2 and the voltage dividing end electrode 31. The transparent conductive structure 4 is connected to the common terminal electrode 32. The sub-pixel electrode 2, the divided terminal electrode 31 and the transparent conductive structure 4 are located in the same layer and are mutually insulation.

In the embodiment of the present invention, as shown in FIG. 3, the sub-pixel unit is provided with a first switch tube T1 and a second switch tube T2, the first switch tube T1 is corresponding to the main pixel area, and the second switch tube T2 is corresponding to the sub-pixel area. Settings. Further, each of the sub-pixel units is provided with a drive scan line (Gate1), a divided voltage scan line (Gate2), a common terminal electrode (Com), and a data line (Data). The driving scan line (Gate1), the divided voltage scan line (Gate2), and the common end electrode (Com) are located in the same layer, and can be formed synchronously in the same patterning process.

The driving scan line and the divided scan line are arranged side by side between the main pixel area and the sub-pixel area to drive the scan line driver Corresponding to the first switching transistor T1 of the main pixel region, the divided scanning line drives the second switching transistor T2 corresponding to the sub-pixel region. Among them, both T1 and T2 are preferably Thin Film Transistors (TFTs). The gate of T1 is connected to drive the scan line, the source is connected to the data line, the drain is connected to the main pixel electrode 1; the gate of T2 is connected to the divided scan line, the source is connected to the data line, and the drain is connected to the sub-pixel electrode 2.

The main pixel electrode 1 can form a liquid crystal capacitor Clc1 with a common electrode on the color filter substrate, and the overlapping portion of the main pixel electrode 1 and the common terminal electrode 11 form a storage capacitor Cst1; the sub-pixel electrode 2 can be connected with a common electrode on the color filter substrate. The liquid crystal capacitor Clc2 is formed, and the overlapping portion of the sub-pixel electrode 2 and the common terminal electrode 32 forms the storage capacitor Cst2.

Further, in addition to the first switch tube T1 and the second switch tube T2, a third switch tube T3 may be disposed in each sub-pixel unit, as shown in FIG. The third switching transistor T3 is also preferably a thin film transistor. Each of the sub-pixel units is further provided with a voltage dividing capacitor Cst3, and the voltage dividing capacitor Cst3 includes a voltage dividing terminal electrode 31 and a common terminal electrode 32.

For the structure shown in FIG. 3, during the display process, the driving scan line first receives the gate driving signal, and turns on its corresponding T1 and T2. At this time, T1 and T2 access the data signal from the data line from the source, and transmit the data signal to the main pixel electrode 1 and the sub-pixel electrode 2 via T1 and T2, so that Clc1, Cst1, Clc2 and Cst2 have equal voltages. . Then, the gate driving signal for driving the scanning line disappears, and the divided scanning line receives the gate driving signal. T1 and T2 are turned off, T3 is turned on, and Cst3 divides a part of the data signal on the sub-pixel electrode 2 through the turned-on T3, lowering the potential on the sub-pixel electrode 2, and lowering the voltages of Clc2 and Cst2, and Clc1 The voltage of Cst1 remains unchanged. At this time, the voltage of Clc2 is significantly lower than the voltage of Clc1, so that the deflection angles of the liquid crystal molecules in the main pixel region and the sub-pixel region are different, thereby improving the phenomenon of large-view character deviation of the VA type display device.

In the embodiment of the present invention, in addition to the above structure, the transparent conductive structure 4 disposed between the voltage dividing end electrode 31 and the sub-pixel electrode 2 is further included, and the transparent conductive structure 4 is electrically connected to the common terminal electrode 32.

Since the voltage dividing terminal electrode 31, the transparent conductive structure 4, and the sub-pixel electrode 2 are the same layer, transparent conductive materials such as Indium Tin Oxide (ITO) and Indium Gallium Zinc Oxide (Indium Gallium Zinc Oxide, etc.) are used. A transparent conductive material such as IGZO). Therefore, the voltage dividing terminal electrode 31, the transparent conductive structure 4, and the sub-pixel electrode 2 are usually formed in the same patterning process. If the transparent conductive material remains during the manufacturing process, the voltage dividing terminal electrode 31 and the transparent conductive structure 4 may be short-circuited, or the transparent conductive structure 4 and the sub-pixel electrode 2 may be short-circuited, or the voltage-dividing terminal electrode 31 may be transparent. The conductive structure 4 and the sub-pixel electrode 2 are short-circuited. Regardless of the short circuit condition, the transparent conductive structure 4 electrically connected to the common terminal electrode 32 will make the potential of the sub-pixel electrode 2 equal to the potential of the common terminal electrode 32. As can be seen from the foregoing, the sub-pixel electrode 2 and the common electrode on the color filter substrate form a liquid crystal capacitor Clc2. At this time, the potentials of the electrodes on both sides of the liquid crystal capacitor Clc2 are equal, and the liquid crystal molecules located in the corresponding regions of the sub-pixel region cannot be driven to be deflected. The pixel area does not emit light, causing the sub-pixel unit to exhibit a dark spot condition.

Since the existing detection method requires all sub-pixel units to be simultaneously charged. Detect using existing inspection methods At the same time, the brightness of the sub-pixel unit having the short-circuit problem will be lower than that of the remaining sub-pixel units, showing a dark spot condition. The sub-pixel unit exhibiting a dark spot condition can be easily detected, and the engineer can repair the sub-pixel unit of the dark spot in time, thereby improving the yield of the liquid crystal display panel and reducing the cost of the liquid crystal display panel.

In the embodiment of the present invention, an insulating layer is disposed between the transparent conductive structure 4 and the common terminal electrode 32. Therefore, as shown in FIG. 2, in order to achieve electrical connection between the transparent conductive structure 4 and the common terminal electrode 32, the insulating layer is provided with a via hole 5 through which the transparent conductive structure 4 is electrically connected to the common terminal electrode 32.

Generally, since the transparent conductive structure 4 is located between the sub-pixel electrode 2 and the voltage dividing terminal electrode 31, in order to ensure insulation between the sub-pixel electrode 2, the transparent conductive structure 4 and the voltage dividing terminal electrode 31, the sub-pixel electrode The distance between the 2 and the divided terminal electrodes 31 should be at least 4 μm.

Preferably, the area of the sub-pixel electrode 2 occupies 60% of the area of the open area of the sub-pixel unit, and the area of the main pixel electrode 1 occupies 40% of the area of the open area of the sub-pixel unit, that is, the area ratio of the sub-pixel electrode 2 to the main pixel electrode 1. It is 6:4. Depending on the display requirements, the area ratio of the sub-pixel electrode 2 to the main pixel electrode 1 may be 5:5, 4:6, etc., which is not limited in the embodiment of the present invention.

In summary, in an embodiment of the present invention, an array substrate is provided, the array substrate includes a plurality of sub-pixel units arranged in an array, and each sub-pixel unit includes a main pixel area, a sub-pixel area, and a voltage dividing capacitor. . A transparent conductive structure electrically connected to the common terminal electrode is disposed between the sub-pixel electrode and the voltage dividing terminal electrode, and the sub-pixel electrode, the voltage dividing terminal electrode and the transparent conductive structure are located in the same layer and are insulated from each other. If the transparent conductive material remains, the voltage dividing terminal electrode and the transparent conductive structure may be short-circuited, or the transparent conductive structure and the sub-pixel electrode may be short-circuited, or the voltage dividing terminal electrode, the transparent conductive structure and the sub-pixel electrode may be short-circuited. The potential of the pixel electrode is equal to the potential of the common terminal electrode. When the detection is performed by the existing detection method, the brightness of the sub-pixel unit having the short-circuit problem will be lower than that of the remaining sub-pixel units, and the dark spot condition is presented, which is easy to detect.

Further, the present invention further provides a display device, preferably a VA type display device, which may specifically be a liquid crystal television, a liquid crystal display, a mobile phone, a tablet computer or the like. The display device includes a color filter substrate and the array substrate provided by the above embodiments of the present invention.

While the embodiments of the present invention have been described above, the described embodiments are merely illustrative of the embodiments of the invention and are not intended to limit the invention. Any modification and variation of the form and details of the embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention. It is still subject to the scope defined by the appended claims.

Description of the reference signs:

1-main pixel electrode; 2-second pixel electrode; 3-partial voltage capacitor; 31-divide terminal electrode; 32-common electrode; 4-transparent conductive structure; 5-via.

Claims

An array substrate, comprising: a plurality of arrays of sub-pixel units, each sub-pixel unit comprising a main pixel area, a sub-pixel area, and a voltage dividing capacitor;

The sub-pixel region includes a sub-pixel electrode, and the voltage dividing capacitor includes a voltage dividing end electrode and a common terminal electrode, and a transparent conductive structure is disposed between the sub-pixel electrode and the voltage dividing end electrode, and the transparent conductive structure The common terminal electrode is electrically connected, and the sub-pixel electrode, the voltage dividing terminal electrode and the transparent conductive structure are located in the same layer and insulated from each other.
The array substrate according to claim 1, wherein an insulating layer is disposed between the transparent conductive structure and the common terminal electrode, and the transparent conductive structure electrically connects the common end through a via hole on the insulating layer electrode.
The array substrate according to claim 1, wherein each of the sub-pixel units is provided with a driving scan line, a divided scanning line, and a data line.
The array substrate according to claim 3, wherein each of the sub-pixel units is further provided with a first switching tube, a second switching tube and a third switching tube;

a gate of the first switch tube is connected to the driving scan line, a source is connected to the data line, and a drain is connected to the main pixel electrode;

a gate of the second switch tube is connected to the driving scan line, a source is connected to the data line, and a drain is connected to the sub-pixel electrode;

The gate of the third switching transistor is connected to the voltage dividing scan line, the source is connected to the sub-pixel electrode, and the drain is connected to the voltage dividing terminal electrode.
The array substrate according to claim 4, wherein the first switching transistor, the second switching transistor, and the third switching transistor are thin film transistors.
The array substrate according to claim 1, wherein

The distance between the sub-pixel electrode and the voltage dividing terminal electrode is at least 4 micrometers.
The array substrate according to claim 1, wherein

The sub-pixel electrode, the voltage dividing terminal electrode, and the transparent conductive structure are formed in the same patterning process.
The array substrate according to claim 1, wherein

The area ratio of the sub-pixel region to the main pixel region is 6:4, 5:5, or 4:6.
A display device, comprising a color filter substrate and an array substrate, the array substrate comprises a plurality of arrays of sub-pixel units, each sub-pixel unit comprising a main pixel region, a sub-pixel region and a voltage dividing capacitor;

The sub-pixel region includes a sub-pixel electrode, and the voltage dividing capacitor includes a voltage dividing end electrode and a common terminal electrode, and a transparent conductive structure is disposed between the sub-pixel electrode and the voltage dividing end electrode, and the transparent conductive structure Electrical connection The common electrode, the sub-pixel electrode, the voltage dividing terminal electrode and the transparent conductive structure are located in the same layer and are insulated from each other.
The display device according to claim 9, wherein the display device is a vertically arranged display device.