CN104516167A - Array baseplate and display device - Google Patents

Abstract

The invention provides an array substrate and a display device, which belong to the field of display technology, and can solve the problem that the large parasitic capacitance generated by the data line and the shielding electrode in the existing array substrate will cause relatively large loads on the data line and the voltage of the common electrode. big impact issues. The array substrate of the present invention includes: a substrate, and a data line, a first electrode, a second electrode arranged on the substrate in sequence, and a shielding electrode arranged above the data line; Corresponding to the first opening, the shielding electrode and the second electrode are arranged on the same layer, and there is no electric field or a weak electric field is formed between them.

Description

Array substrate and display device

technical field

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

Background technique

With the development of display manufacturing technology, liquid crystal display technology has developed rapidly, and has gradually replaced traditional picture tube displays and become the mainstream of future flat panel displays. In the field of liquid crystal display technology, TFT-LCD (Thin Film Transistor Liquid Crystal Display, Thin Film Transistor Liquid Crystal Display) is widely used in TVs, computers, mobile phones due to its advantages of large size, high integration, powerful functions, flexible process, and low cost. and other fields.

Among them, the display panel in ADS mode (advanced ultra-dimensional field switching mode) forms a multi-dimensional electric field through the electric field generated by the edge of the slit electrode in the same plane and the electric field generated between the slit electrode layer and the plate electrode layer, so that the inside of the liquid crystal cell All aligned liquid crystal molecules between the slit electrodes and directly above the electrodes can be rotated, thereby improving the working efficiency of the liquid crystal and increasing the light transmission efficiency. The display panel in ADS mode is made by assembling an array substrate (ie, TFT substrate) and a color filter substrate (ie, CF substrate) into boxes and filling them with liquid crystals. Generally, as shown in FIG. 1 , patterns of gate lines 2 (ie, scan lines), patterns of data lines 1 (ie, signal lines), patterns of thin film transistors 5 , patterns of via holes, and pixels are formed on the array substrate. The pattern of the electrode (that is, the display electrode) and the pattern of the common electrode, wherein a plurality of gate lines 2 and a plurality of data lines 1 intersect to define several pixel areas A, wherein one of the pixel electrodes 6 and the common electrode 3 is a plate electrode , one is a slit electrode, and the slit electrode is located above the plate electrode (in the present invention, the pixel electrode 6 is a plate electrode, and the common electrode 3 is a slit electrode as an example for description). It should be noted that a first insulating layer 11 is provided between the layer where the data line 1 is located and the layer where the pixel electrode 6 is located (it should be noted that the first insulating layer 11 may also be absent in some array substrates), A second insulating layer 12 is disposed between the layer where the pixel electrode 6 is located and the layer where the common electrode 3 is located. Black matrix (BM) graphics, RGB graphics, etc. are formed on the color filter substrate.

As shown in FIGS. 1 and 2 , the pattern of the pixel electrode 6 is generally separated from the pattern of the data line 1 by a certain distance, so an electric field is formed between the pixel electrode 6 and the data line 1 and between the common electrode 3 and the data line 1 . But the distance between the pixel electrode 6 and the data line 1 is very small, so the influence of the generated electric field is also very small, mainly because the electric field generated between the data line 1 and the slit-shaped common electrode 3 will cause each data line 1 The liquid crystal molecules above and on both sides cannot be effectively deflected, causing the problem of light leakage.

In order to solve the above problems, in the prior art, the shielding electrode 4 is usually formed at the position corresponding to the data line 1 while the common electrode 3 is formed (the shielding electrode 4 is also a part of the common electrode 3 in essence, but because it is arranged on the data line 1 is used to shield the data line 1, so it is called the shielding electrode 4), the shielding electrode 4 and the common electrode 3 are connected to the same signal, and are used to shield the data line 1, so as to prevent the formation between the data line 1 and the common electrode 3. Electric field, but at the same time, it will cause a large capacitance between the shielding electrode 4 and the data line 1, so the data voltage signal on the data line 1 will affect the signal on the shielding electrode 4, and then cause the common voltage on the common electrode 3. The signal of electrode 3 is interfered and fluctuates greatly, causing problems such as Greenish flicker and excessive load. And at the same time, since the shielding electrode 4 and the common electrode 3 are made of the same material, that is to say, the shielding electrode 4 is light-transmitting, it is necessary to form a black matrix at the position corresponding to the shielding electrode 4 on the color filter substrate, and the color filter substrate and the Unavoidable deviations will occur when the array substrate is aligned, so the width of the formed black matrix is relatively wide, resulting in a decrease in the aperture ratio of the display panel.

Contents of the invention

The technical problems to be solved by the present invention include, aiming at the above-mentioned technical problems existing in the existing array substrate, to provide an array substrate that greatly reduces the parasitic capacitance between the shielding electrode and the data line on the array substrate and does not affect the aperture ratio of the display panel at the same time. and display device.

The technical solution adopted to solve the technical problem of the present invention is an array substrate, including: a substrate, and a data line, a first electrode, a second electrode arranged on the substrate in sequence, and a shielding electrode arranged above the data line;

A first opening corresponding to the position of the data line is formed in the shielding electrode, the shielding electrode and the second electrode are arranged on the same layer, and there is no electric field or a weak electric field is formed between them.

Preferably, the array substrate further includes light-shielding strips arranged under the data lines;

The light-shielding strip completely overlaps with the projection area of the shielding electrode on the substrate, and is used to prevent light from the backlight from passing through the position where the shielding electrode is located.

Further preferably, a second opening corresponding to the position of the data line is formed in the light-shielding strip, and the width of the second opening is equal to the width of the data line.

Still further preferably, the width of the first opening is equal to the width of the second opening.

Preferably, there is no electric field or a weak electric field is formed between the shading strip and the second electrode.

Preferably, the array substrate further includes a thin film transistor disposed on the substrate,

The light-shielding strip is set on the same layer as the gate of the thin film transistor, and is made of the same material.

Preferably, the shielding electrode and the second electrode are connected to the same signal line.

Preferably, the first electrode is a plate electrode, and the second electrode is a slit electrode.

Further preferably, the plate electrode is a pixel electrode, and the slit electrode is a common electrode; or,

The plate electrode is a common electrode, and the slit electrode is a pixel electrode.

The technical solution adopted to solve the technical problem of the present invention is an array substrate, which includes the above-mentioned array substrate.

The present invention has following beneficial effect:

Since the shielding electrodes are arranged directly above the data lines in the array substrate of the invention, it is possible to avoid the problem that an electric field is generated between the data lines and the common electrodes in the liquid crystal panel, resulting in that the liquid crystals on both sides of the data lines cannot be effectively rotated. The problem corresponding to the data line is provided with a first opening, so the effective facing area of the data line and the shielding electrode can be reduced, thereby reducing the parasitic capacitance generated between the data line and the shielding electrode, thereby greatly reducing the shielding electrode The effect on the load on the data line and the common voltage signal on the common electrode.

Since the display device of the present invention includes the above-mentioned array substrate, the aperture ratio of the display device is higher than that of the display panel.

Description of drawings

FIG. 1 is a schematic plan view of an existing array substrate;

Fig. 2 is a sectional view of AA' of Fig. 1;

3 is a schematic plan view of an array substrate according to Embodiment 1 of the present invention;

Fig. 4 is the sectional view of AA' of Fig. 3;

FIG. 5 is a preferred schematic diagram of the array substrate according to Embodiment 1 of the present invention.

The reference signs are: 1. data line; 2. gate line; 3. common electrode; 4. shielding electrode; 5. thin film transistor; 6. pixel electrode; 7. shading strip; 4-1. first opening; 7 -1. The second opening; 10. The base; 11. The first insulating layer; 12. The second insulating layer; 13. The third insulating layer.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

An array substrate, which includes: a base, a data line, a first electrode, a second electrode arranged on the base in sequence, and a shielding electrode arranged above the data line; Corresponding to the first opening, the shielding electrode and the second electrode are arranged on the same layer, and there is no electric field or a weak electric field is formed between them.

Wherein, the first electrode is a plate electrode, and the second electrode is a slit electrode. The plate electrode is a pixel electrode, and the slit electrode is a common electrode; or, the plate electrode is a common electrode, and the slit electrode is a pixel electrode. However, in the following embodiments, the first electrode is a plate-shaped pixel electrode and the second electrode is a slit-shaped common electrode as an example for further description. However, this embodiment is not limited to the case where the first electrode is a pixel electrode and the second electrode is a common electrode, and the first electrode is a common electrode and the second electrode is a pixel electrode is also within the protection scope of the present invention.

Example 1:

As shown in Figures 3 and 4, this embodiment provides an array substrate, which includes a plurality of gate lines 2 and a plurality of data lines 1 intersecting and insulated (where the layer where the gate line 2 is located and the layer where the data line 1 is located The third insulating layer 13) is provided, and the pixel area is defined at the crossing position of the gate line 2 and the data line 1, and a pixel electrode 6 and a common electrode 3 are arranged in each pixel area, wherein the pixel electrode 6 is plate-shaped The common electrode 3 is a slit electrode arranged above the pixel electrode 6. It should be noted that a first insulating layer 11 (the first insulating layer 11 is arranged between the layer where the data line 1 is located and the layer where the pixel electrode 6 is located) It may not be available in some array substrates), a second insulating layer 12 is provided between the layer where the pixel electrode 6 is located and the layer where the common electrode 3 is located. In particular, a shielding electrode 4 disposed on the same layer as the common electrode 3 is disposed directly above the data line 1 in this embodiment, and there is no electric field or a weak electric field is formed between the shielding electrode 4 and the common electrode 3 , and A first opening 4 - 1 corresponding to the position of the data line 1 is formed in the shielding electrode 4 .

Since the shielding electrode 4 is provided directly above the data line 1 in the array substrate of this embodiment, it is possible to avoid the occurrence of an electric field between the data line 1 and the common electrode 3 in the liquid crystal panel, resulting in that the liquid crystals on both sides of the data line 1 cannot effectively rotate. At the same time, the first opening 4-1 is provided on the corresponding part of the shielding electrode 4 and the data line 1, so the effective facing area of the data line 1 and the shielding electrode 4 can be reduced, thereby reducing the number of data lines 1 and the shielding electrode 4. The parasitic capacitance generated therebetween greatly reduces the impact of the shielding electrode 4 on the load on the data line 1 and on the common voltage signal on the common electrode 3 .

Since there is no electric field or a weak electric field is formed between the shielding electrode 4 and the common electrode 3, it may be preferable to connect the common electrode 3 wire and the shielding electrode 4 to the same signal line, that is to say, the signal line applied on the common electrode 3 and the shielding electrode 4 The same voltage makes wiring simple and easy to implement.

As shown in FIG. 5 , preferably, a shading strip 7 is arranged under the data line 1 in this embodiment; the shading strip 7 completely overlaps with the projected area of the shielding electrode 4 on the substrate, so as to prevent light from the backlight Transmitting from the position where the shielding electrode 4 is located causes light leakage on the display panel, resulting in a poor picture displayed on the display panel. At the same time, it can be understood that since the light from the backlight cannot pass through the position corresponding to the shielding electrode 4 on the array substrate, it is necessary to form a black matrix at the position corresponding to the shielding electrode 4 on the color filter substrate. When the box is aligned with the color film substrate, there will be an inevitable deviation of the box, so the width of the matrix needs to be made wider to prevent the light from the backlight from passing through. However, due to the increase in the width of the black matrix, it is bound to decrease. Displays the aperture ratio of the panel. However, in this embodiment, the light-shielding strip 7 used to prevent the light from the backlight from passing through the area where the shielding electrode 4 is located is arranged on the side of the array substrate, so the preparation of a black matrix corresponding to the position of the shielding electrode 4 on the color filter substrate can be omitted. Therefore, the aperture ratio of the display panel will not be affected.

It should be noted that the projection area of the shading strip 7 and the shielding electrode 4 on the substrate does not necessarily coincide completely, and the size of the first opening 4-1 of the shielding electrode 4 and the width of the shading strip 4 must be Design according to different design requirements, for example, if the parasitic capacitance is required to be small, then the first opening 4-1 of the shielding electrode 4 will be relatively large; if the requirement is general, the width of the first opening 4-1 of the shielding electrode 4 It may also be half of the width of the data line 1 . And the width of the light-shielding strip 4 will be under the fixed first opening 4-1, to prevent the influence range of the data line 1 on the liquid crystal molecules, if the influence range is larger, then the width of the light-shielding strip 4 will be wider, otherwise on the contrary.

Wherein, there is no electric field or a weak electric field is formed between the light-shielding strip 7 and the second electrode, that is to say, the voltage applied to the light-shielding strip 7 and the second electrode can be the same or the applied voltage is not much different; of course It is also possible that both ends of the light-shielding strip 7 are suspended, and at this time there is no electric field between the light-shielding strip 7 and the second electrode. The reason for this setting is that if an electric field is generated between the second electrodes of the light-shielding strip 7, the liquid crystal molecules on both sides of the data line 1 cannot be effectively rotated, resulting in a problem of poor display; The rotation of the liquid crystal molecules above the light-shielding strip 7 will not be affected by the electric field, or only a weak electric field is formed, and even if there is some influence, it is very small and can be ignored.

Further preferably, a second opening 4 - 2 corresponding to the position of the data line 1 is formed in the light-shielding strip 7 , and the width of the second opening 4 - 2 is equal to the width of the data line 1 . Therefore, it is possible to effectively avoid unavoidable parasitic capacitance due to the facing area between the light-shielding strip 7 and the data line 1, resulting in a large load on the data line 1, thereby causing the voltage on the data line 1 to be pulled down. cause poor display.

Further preferably, the width of the first opening 4-1 on the shielding electrode 4 is equal to the width of the second opening 4-2, that is, the width of the first opening 4-1 is equal to the width of the data line 1, so that the width of the first opening 4-1 can be as large as possible. It is possible to avoid the generation of parasitic capacitance between the shielding electrode 4 and the data line 1 , and at the same time, the position outside the first opening 4 - 1 of the shielding electrode 4 is blocked by the light-shielding strip 7 , so light leakage will not be caused.

It can be understood that the thin film transistor 5 is disposed on the array substrate, and preferably, the light-shielding strip 7 is disposed on the same layer as the gate of the thin film transistor 5 and made of the same material. That is to say, the light-shielding strip 7 can be formed by one patterning process with the grid, so that the preparation process steps can be saved, the cost can be saved, and the production efficiency can be improved. Of course, the light-shielding strip 7 may not be formed on the same layer as the grid, as long as it is formed under the data line 1 and can block the light of the backlight from passing through the area corresponding to the display panel and the shielding electrode 4, and it can be understood that The material of the light-shielding strip 7 can also be different from that of the grid, as long as it is a material capable of shielding light.

The array substrate provided by this embodiment can not only alleviate the problem of large parasitic capacitance between the shielding electrode 4 and the data line 1 in the prior art array substrate, but also set the light-shielding strip 7 on the array substrate, so The problem of affecting the aperture ratio of the display panel due to the large width of the black matrix does not appear.

Example 2:

This embodiment provides a display device, which includes the display panel described in Embodiment 1, so its performance is better.

The display device provided by the present invention may be a liquid crystal display device of any mode such as TN, ADS, IPS, LTPS and the like. The display device can be any product or component with a display function, such as a liquid crystal panel, a liquid crystal TV, a monitor, a mobile phone, a navigator, and the like.

It can be understood that, the above embodiments are only exemplary embodiments adopted for illustrating the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (10)

1. An array substrate, comprising: a substrate, and a data line, a first electrode, and a second electrode arranged on the substrate in sequence, wherein the array substrate further includes a shielding electrode arranged above the data line; A first opening corresponding to the position of the data line is formed in the shielding electrode, the shielding electrode and the second electrode are arranged on the same layer, and there is no electric field or a weak electric field is formed between them. 2. The array substrate according to claim 1, characterized in that, the array substrate further comprises a light-shielding strip disposed under the data lines; The light-shielding strip completely overlaps with the projection area of the shielding electrode on the substrate, and is used to prevent light from the backlight from passing through the position where the shielding electrode is located. 3 . The array substrate according to claim 2 , wherein a second opening corresponding to a position of the data line is formed in the light-shielding strip, and a width of the second opening is equal to a width of the data line. 4 . 4. The array substrate according to claim 3, wherein a width of the first opening is equal to a width of the second opening. 5. The array substrate according to any one of claims 2-4, wherein there is no electric field or a weak electric field is formed between the light-shielding strip and the second electrode. 6. The array substrate according to any one of claims 2-4, wherein the array substrate further comprises a thin film transistor disposed on the base, The light-shielding strip is set on the same layer as the gate of the thin film transistor, and is made of the same material. 7. The array substrate according to any one of claims 1-4, wherein the shielding electrode and the second electrode are connected to the same signal line. 8 . The array substrate according to claim 1 , wherein the first electrode is a plate electrode, and the second electrode is a slit electrode. 9. The array substrate according to claim 8, wherein the plate electrode is a pixel electrode, and the slit electrode is a common electrode; or, The plate electrode is a common electrode, and the slit electrode is a pixel electrode. 10. A display device, characterized in that the display device comprises the array substrate according to any one of claims 1-9.