Display substrate and display device

Abstract

The invention discloses a display substrate and a display device. The display substrate comprises a display area. The display substrate comprises a first substrate (101), a second substrate (102) and a liquid crystal layer (40). The first substrate (101) and the second substrate (102) are arranged oppositely. The liquid crystal layer (40) is located between the first substrate (101) and the second substrate (102). The first substrate (101) comprises a first substrate (10), a driving circuit layer (20), a pixel electrode (32) and a common electrode (31), wherein the driving circuit layer (20) is located on the side, facing the second substrate (102), of the first substrate (10), and the pixel electrode (32) and the common electrode (31) are located on the side, facing the second substrate (102), of the first substrate (10). The second substrate (102) comprises a second substrate (50) and a transparent conductive layer (60) located on the side, facing the first substrate (101), of the second substrate (50), and the transparent conductive layer (60) is at least located in the display area. The display device comprises a display substrate.

Description

Display substrate and display device Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display substrate and a display device. Background Art

[0002] With the continuous development of display technology, display devices such as mobile phones, laptops, and televisions have become necessities in people's work and life. Liquid crystal display devices have become the mainstream display device due to their advantages such as high brightness, vivid colors, and wide viewing angle.

[0003] Summary of the Invention

[0004] The present application provides a display substrate and a display device.

[0005] According to a first aspect of an embodiment of the present application, a display substrate is provided. The display substrate includes a display area; the display substrate includes a first substrate, a second substrate, and a liquid crystal layer; the first substrate and the second substrate are arranged opposite to each other, and the liquid crystal layer is located between the first substrate and the second substrate;

[0006] The first substrate includes a first substrate, a driving circuit layer located on the side of the first substrate facing the second substrate, and a pixel electrode and a common electrode located on the side of the first substrate facing the second substrate; the second substrate includes a second substrate and a transparent conductive layer located on the side of the second substrate facing the first substrate, and the transparent conductive layer is at least located in the display area.

[0007] In one embodiment, the orthographic projection of the transparent conductive layer on the second substrate covers the second substrate.

[0008] In one embodiment, the transparent conductive layer is provided with a plurality of hollow portions.

[0009] In one embodiment, the second substrate further includes a light-shielding layer located on the side of the second substrate facing the first substrate, the light-shielding layer is provided with a plurality of openings, and the orthographic projection of each of the hollow portions on the second substrate at least partially overlaps with the orthographic projection of one of the openings on the second substrate.

[0010] In one embodiment, the second substrate further includes at least one patterned functional film layer located on the side of the second substrate facing the first substrate, and the orthographic projection of the transparent conductive layer on the second substrate coincides with the orthographic projection of one of the functional film layers on the second substrate.

[0011] In one embodiment, the second substrate further includes a light-shielding layer and a color filter layer located on the side of the second substrate facing the first substrate, the light-shielding layer is provided with a plurality of openings, and the color filter layer includes at least three sub-color filter layers of different colors; the at least one patterned functional film layer includes the light-shielding layer and the sub-color filter layer.

[0012] In one embodiment, the transparent conductive layer includes a plurality of strip-shaped conductive structures. The plurality of strip-shaped conductive structures extend in the same direction, and adjacent strip-shaped conductive structures are spaced apart.

[0013] In one embodiment, the second substrate further includes a light shielding layer located on a side of the second substrate facing the first substrate and having an opening, and a color filter layer at least partially located in the opening;

[0014] The transparent conductive layer is located between the second substrate and the light shielding layer.

[0015] In one embodiment, the second substrate further includes a light shielding layer located on a side of the second substrate facing the first substrate and having an opening, a color filter layer at least partially located in the opening, and a planar layer located on a side of the color filter layer away from the second substrate;

[0016] The transparent conductive layer is located between the color filter layer and the flat layer.

[0017] In one embodiment, the second substrate further includes a light shielding layer located on a side of the second substrate facing the first substrate and having an opening, a color filter layer at least partially located in the opening, and a planar layer located on a side of the color filter layer away from the second substrate;

[0018] The transparent conductive layer is located on a side of the planar layer away from the second substrate.

[0019] In one embodiment, the second substrate further comprises an electrostatic release layer located on a side of the second substrate away from the first substrate;

[0020] The thickness of the transparent conductive layer is less than or equal to the thickness of the electrostatic release layer.

[0021] In one embodiment, the minimum thickness of the transparent conductive layer is equal to 10% of the thickness of the electrostatic release layer.

[0022] In one embodiment, the transparent conductive layer is connected to a constant electrical signal.

[0023] In one embodiment, the second substrate further comprises an electrostatic release layer located on a side of the second substrate away from the first substrate, wherein the electrostatic release layer is connected to a constant electrical signal;

[0024] The transparent conductive layer is electrically connected to the electrostatic release layer.

[0025] In one embodiment, the second substrate further includes a conductive portion located on a side of the second underlayer, and the electrostatic release layer and the transparent conductive layer are electrically connected to the conductive portion respectively.

[0026] In one embodiment, the transparent conductive layer is in contact with the second substrate; the second substrate further includes a light-shielding layer located on the side of the transparent conductive layer away from the second substrate, a color filter layer at least partially located on the side of the light-shielding layer away from the second substrate, a flattening layer located on the side of the color filter layer away from the second substrate, and a liquid crystal alignment film located on the side of the flattening layer away from the second substrate.

[0027] In one embodiment, the thickness of the second substrate, the thickness of the light shielding layer, the thickness of the color filter layer, and the thickness of the planar layer are all greater than the thickness of the transparent conductive layer.

[0028] In one embodiment, the first substrate includes a plurality of pixel electrodes arranged at intervals, and the orthographic projection of the gap between adjacent pixel electrodes on the second substrate falls within the orthographic projection of the transparent conductive layer on the second substrate.

[0029] In one embodiment, the material of the transparent conductive layer includes at least one of metal oxide, graphene, metal nanowires, carbon nanotubes, conductive polymers, and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid.

[0030] According to a second aspect of an embodiment of the present application, a display device is provided, comprising the above-mentioned display substrate.

[0031] The display substrate and display device provided in the embodiments of the present application are configured such that a transparent conductive layer is provided at least in the display area on the side of the second substrate of the second substrate facing the first substrate. The transparent conductive layer can form a longitudinal electric field with the conductive structure in the second substrate. The longitudinal electric field can hinder the horizontal movement of impurity ions and prevent the accumulation of impurity ions. This can improve the phenomenon of linear stains that appear on the display substrate during a black and white checkerboard test, as well as the phenomenon of ghosting that occurs when the display substrate switches from one frame to another, thereby improving the display quality of the display substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a partial cross-sectional view of a display substrate provided by an exemplary embodiment of the present application;

[0033] FIG2 is a partial cross-sectional view of a display substrate provided by another exemplary embodiment of the present application;

[0034] FIG3 is a partial cross-sectional view of a display substrate provided by yet another exemplary embodiment of the present application;

[0035] FIG4 is a partial cross-sectional view of a display substrate provided by another exemplary embodiment of the present application;

[0036] FIG5 is a top view of the transparent conductive layer of the display substrate shown in FIG4;

[0037] FIG6 is a partial cross-sectional view of a display substrate provided by another exemplary embodiment of the present application;

[0038] FIG7 is a top view of the transparent conductive layer of the display substrate shown in FIG6;

[0039] FIG8 is a partial cross-sectional view of a display substrate provided by another exemplary embodiment of the present application;

[0040] FIG9 is a partial cross-sectional view of a display substrate provided by yet another exemplary embodiment of the present application;

[0041] FIG. 10 is a partial cross-sectional view of a display substrate provided by yet another exemplary embodiment of the present application. DETAILED DESCRIPTION

[0042] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0043] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0044] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0045] Impurity ions are introduced during the display substrate manufacturing process, such as during the preparation of the display substrate's color filter layer. During the display process, a horizontal electric field exists between adjacent pixel electrodes on the display substrate. This horizontal electric field causes impurity ions to aggregate, affecting the display substrate's quality. This can manifest as linear stains when performing a black and white checkerboard test on the display substrate under high temperature conditions, or as streaking when switching from one frame to another.

[0046] The checkerboard test on a display substrate involves dividing the display area of ​​the substrate into multiple sub-display areas arranged in multiple rows and columns. The sub-pixel grayscale of one of two adjacent sub-display areas in the same row is set to 0, resulting in a black display, while the sub-pixel grayscale of the other sub-display area is set to 255, resulting in a white display. Similarly, the sub-pixel grayscale of one of two adjacent sub-display areas in the same column is set to 0, resulting in a black display, while the sub-pixel grayscale of the other sub-display area is set to 255, resulting in a white display. After a period of time spent under high temperature, the checkerboard test on the display substrate may reveal linear stains extending along the rows or columns, located at the junction of two adjacent sub-display areas.

[0047] The embodiments of the present application provide a display substrate and a display device that can solve the above-mentioned problems. The display substrate and the display device in the embodiments of the present application are described in detail below with reference to the accompanying drawings. The features of the following embodiments can complement or be combined with each other unless they conflict.

[0048] Embodiments of the present application provide a display substrate. The display substrate includes a display area. As shown in FIG1 , the display substrate includes a first substrate 101, a second substrate 102, and a liquid crystal layer 40. The first substrate 101 and the second substrate 102 are disposed opposite each other, and the liquid crystal layer 40 is located between the first substrate 101 and the second substrate 102.

[0049] The first substrate 101 includes a first substrate 10 and a driving circuit layer 20 located on the side of the first substrate 10 facing the second substrate 102. The second substrate 102 includes a second substrate 50 and a transparent conductive layer 60 located on the side of the second substrate 50 facing the first substrate 101. The transparent conductive layer 60 is located at least in the display area.

[0050] The display substrate provided in the embodiment of the present application is provided with a transparent conductive layer 60 located at least in the display area on the side of the second substrate 50 of the second substrate 102 facing the first substrate 101. The transparent conductive layer 60 can form a longitudinal electric field with the conductive structure in the second substrate 102. The longitudinal electric field can hinder the horizontal movement of impurity ions and prevent the accumulation of impurity ions. This can improve the phenomenon of linear stains that appear on the display substrate during the black and white checkerboard test, as well as the phenomenon of ghosting when the display substrate switches from one frame to another, thereby improving the display quality of the display substrate.

[0051] In one embodiment, as shown in FIG. 1 , the liquid crystal layer 40 includes a plurality of liquid crystal molecules 41 arranged at intervals.

[0052] In one embodiment, the liquid crystal molecules 41 are negative liquid crystal molecules. The material of negative liquid crystal molecules has a high content of polar monomers, which makes it easy for linear stains to appear on the display substrate when performing a black and white checkerboard test under high temperature conditions.

[0053] In one embodiment, the liquid crystal molecules 41 of the liquid crystal layer 40 are negative liquid crystal molecules, which can improve the contrast and light transmittance of the display substrate.

[0054] In one embodiment, the display substrate further includes a frame sealant located between the first substrate 101 and the second substrate 102, and the frame sealant surrounds the liquid crystal layer 40. The first substrate 101 and the second substrate 102 are adhered together by the frame sealant.

[0055] In one embodiment, the first substrate 10 can be a flexible substrate or a rigid substrate. The first substrate 10 has a high light transmittance to reduce light loss when light emitted by the backlight passes through the first substrate 10. The flexible substrate material may include one or more of polyimide, polyethylene terephthalate, polycarbonate, and organic resin materials. The organic resin material may include epoxy resin, triazine, silicone resin, or polyimide. The rigid substrate may include any of glass substrates, quartz substrates, sapphire substrates, and the like.

[0056] In one embodiment, the display substrate further includes a pixel electrode and a common electrode. The display substrate is an ADS (Advanced Super Dimension Switch) display substrate. The ADS display substrate has a fast response speed and displays bright colors with high saturation. In the ADS display substrate, the pixel electrode and the common electrode are located on the same side of the liquid crystal layer. As shown in Figure 1, the common electrode 31 and the pixel electrode 32 are both located on the first substrate 101 and on the side of the first substrate 10 facing the second substrate 102, with the pixel electrode 32 and the common electrode 31 arranged opposite each other.

[0057] In one embodiment, as shown in FIG1 , the pixel electrode 32 is a strip electrode, the first substrate 101 includes a plurality of pixel electrodes 32 arranged at intervals, the common electrode 32 may be a plate electrode, and each pixel electrode 32, the portion of the common electrode 31 opposite to the pixel electrode 32, and the liquid crystal molecules opposite to the pixel electrode 32 form a sub-pixel.

[0058] In another embodiment, the pixel electrode and the common electrode are both strip electrodes, and the pixel electrode and the common electrode may extend in the same direction. The pixel electrodes and the common electrodes may correspond one to one, and each pixel electrode, the common electrode corresponding to the pixel electrode, and the liquid crystal molecules located between the pixel electrode and the common electrode form a sub-pixel.

[0059] In one embodiment, as shown in FIG1 , the common electrode 31 may be located between the driving circuit layer 20 and the first substrate 10, and the pixel electrode 32 may be located on a side of the driving circuit layer 20 away from the first substrate 10. In other embodiments, the pixel electrode 32 may be located between the driving circuit layer 20 and the first substrate 10, and the common electrode 31 may be located on a side of the driving circuit layer 20 away from the first substrate 10. In one embodiment, the material of the pixel electrode 31 and the common electrode 32 may be a transparent conductive material. For example, the material of the pixel electrode 31 and the common electrode 32 may include at least one of indium zinc oxide and indium tin oxide.

[0060] In one embodiment, the driving circuit layer 20 may include a plurality of pixel circuits, each corresponding to a sub-pixel, and each pixel circuit drives a corresponding sub-pixel. The pixel circuit may include a plurality of thin film transistors. The pixel circuit may also include a capacitor.

[0061] In one embodiment, as shown in FIG1 , the driving circuit layer 20 may further include a plurality of signal lines 21, a first insulating layer 22, and a second insulating layer 23 located on a side of the first insulating layer 22 away from the first substrate 10, and at least part of the signal lines 21 may be located between the first insulating layer 22 and the second insulating layer 23. The plurality of signal lines 21 may include data signal lines, scanning signal lines, power signal lines, etc. The signal lines 21 located between the first insulating layer 22 and the second insulating layer 23 may include data lines. The conductive structures in the first substrate 101 include the gate electrode, source electrode, and drain electrode of the thin film transistor, the two plates of the capacitor, the signal line, the pixel electrode 32, and the common electrode 31. These conductive structures may form a longitudinal electric field with the transparent conductive layer 60 of the second substrate 102.

[0062] In one embodiment, as shown in FIG1 , the display substrate further comprises a liquid crystal alignment film 24 located on a side of the drive circuit layer 20 away from the first substrate 10 . Pixel electrodes 32 may be located between the liquid crystal alignment film 24 and the drive circuit layer 20 , and the liquid crystal alignment film 24 covers each pixel electrode 32 . In some embodiments, the material of the liquid crystal alignment film 24 may be PI (Polyimide). In other embodiments, the material of the liquid crystal alignment film 24 may also be other organic materials.

[0063] In one embodiment, the second substrate 50 can be a flexible substrate or a rigid substrate. The second substrate 50 has a high light transmittance to reduce light loss. The flexible substrate material may include, for example, one or more of polyimide, polyethylene terephthalate, polycarbonate, and an organic resin material. The organic resin material may include epoxy resin, triazine, silicone resin, or polyimide. The rigid substrate may include, for example, a glass substrate, a quartz substrate, or a sapphire substrate.

[0064] In one embodiment, as shown in FIG1 , the second substrate 102 further includes a light-shielding layer 71 and a color filter layer 72 located on the side of the second substrate 50 facing the first substrate 101. The light-shielding layer 71 is provided with a plurality of openings 711, each opening 711 corresponding to a sub-pixel; the color filter layer 72 is at least partially located within the openings 711. In the embodiment shown in FIG1 , the color filter layer 72 is partially located within the openings 711 and partially located on the side of the light-shielding layer 71 away from the second substrate 50. The color filter layer 72 may include at least three sub-color filter layers of different colors, each sub-color filter layer including a plurality of spaced-apart color filter portions, with one color filter portion located within one opening 711. In some embodiments, the color filter layer 72 may include a red sub-color filter layer, a green sub-color filter layer, and a blue sub-color filter layer. In some embodiments, the light-shielding layer 71 may be made of an organic resin doped with black particles. In one embodiment, as shown in FIG1 , the second substrate 102 further includes a planar layer 81. The planar layer 81 is located on a side of the light shielding layer 71 and the color filter layer 72 away from the second substrate 50. The surface of the planar layer 81 away from the second substrate 50 is substantially flat. The material of the planar layer 81 can be an organic resin.

[0065] In one embodiment, as shown in FIG1 , the second substrate 102 further includes a liquid crystal alignment film 82 located on a side of the planar layer 81 away from the second substrate 50. In some embodiments, the liquid crystal alignment film 82 may be made of PI. In other embodiments, the liquid crystal alignment film 82 may be made of other organic materials.

[0066] In one embodiment, as shown in FIG1 , the second substrate 102 further includes a spacer 90 located on the side of the liquid crystal alignment film 82 facing the first substrate 101. The spacer 90 may be made of an organic resin.

[0067] In one embodiment, as shown in FIG1 , the second substrate 102 further includes an electrostatic release layer 83 located on a side of the second substrate 50 away from the first substrate 101. The electrostatic release layer 83 can conduct static charges on the surface of the display substrate away from the first substrate 10, preventing the static charges accumulated on the surface of the display substrate from being conducted toward the first substrate 10. This effectively prevents the problem of characteristic deviation of the thin film transistors of the pixel circuit caused by the conduction of static charges to the driving circuit layer 20, thereby improving the display effect of the display panel.

[0068] In one embodiment, the electrostatic release layer 83 has an orthographic projection on the second substrate 50 that covers the second substrate 50. Thus, the electrostatic release layer 83 can more effectively prevent static charge from being conducted to the driving circuit layer 20 of the first substrate 101. The electrostatic release layer 83 is connected to a constant electrical signal. For example, the electrostatic release layer 83 can be connected to a ground signal.

[0069] In one embodiment, the material of the electrostatic release layer 83 is a transparent conductive material. The material of the electrostatic release layer 83 includes, for example, at least one of metal oxides, graphene, metal nanowires, carbon nanotubes, conductive polymers, and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid. Not all of these materials are suitable for the electrostatic release layer 83. Only materials with higher light transmittance among these materials can be used for the electrostatic release layer 83 to reduce the impact on the light transmittance of the display substrate. For example, the material of the electrostatic release layer 83 can be a metal oxide such as indium tin oxide or indium zinc oxide, which have higher light transmittance.

[0070] In one embodiment, as shown in Figures 1 to 3 , the orthographic projection of the transparent conductive layer 60 on the second substrate 50 covers the second substrate 50. This configuration increases the area of ​​the transparent conductive layer 60, and the electric field strength formed by the transparent conductive layer 60 and the conductive structures in the first substrate 101 is greater, which can more effectively prevent the accumulation of impurity ions and further enhance the display quality of the display substrate. The display substrate also includes a peripheral region located outside the display area, and the transparent conductive layer 60 covers both the display area and the peripheral region. In this way, the transparent conductive layer 60 provides electrostatic protection for the peripheral region, thereby enhancing the anti-static capability of the display substrate.

[0071] In another embodiment, as shown in FIG. 4 to FIG. 7 , the transparent conductive layer 60 is provided with a plurality of hollow portions 61 .

[0072] In one embodiment, the second substrate 102 includes at least one patterned functional film layer located on the side of the second substrate 50 facing the first substrate 101. The orthographic projection of the transparent conductive layer 60 on the second substrate 50 coincides with the orthographic projection of one of the functional film layers on the second substrate 50. With this arrangement, the transparent conductive layer 60 and the functional film layer can be produced using the same mask, which helps reduce the production cost of the display substrate.

[0073] In one embodiment, the at least one patterned functional film layer of the second substrate 102 includes a light shielding layer 71 and the sub-color filter layer. That is, the transparent conductive layer 60 can be prepared using the same mask as the light shielding layer 71 or a sub-color filter layer.

[0074] In one embodiment, as shown in Figures 4 and 5 , the orthographic projection of the transparent conductive layer 60 on the second substrate 50 overlaps with the orthographic projection of the light-shielding layer 71 on the second substrate 50. This reduces the manufacturing cost of the display substrate while maximizing the light transmittance of the display substrate. Experimental verification has shown that the light transmittance of the display substrate shown in Figures 4 and 5 is approximately 5% higher than that of the display substrate shown in Figures 1 to 3 . In the embodiments shown in Figures 4 and 5 , the hollow portion 61 is a through hole.

[0075] In one embodiment, as shown in Figures 6 and 7 , the transparent conductive layer 60 includes a plurality of strip-shaped conductive structures 62. These strip-shaped conductive structures 62 extend in the same direction and are spaced apart from each other. The gaps between adjacent strip-shaped conductive structures 62 constitute hollow portions 61. Specifically, the hollow portions 61 are elongated, with the length of the strip-shaped conductive structures 62 being the same as that of the hollow portions 61. The length of the hollow portions 61 can be the row or column direction of the subpixels in the display substrate. In other embodiments, the angle between the length of the hollow portions 61 and the row or column direction of the subpixels can be acute. In the embodiments shown in Figures 6 and 7 , the width of the hollow portions 61 is smaller than the size of the openings 711 in the light shielding layer 71. In other embodiments, the width of the hollow portions 61 can be greater than or equal to the size of the openings 711 in the light shielding layer 71. In the embodiment shown in FIG6 , in the width direction of the hollow portion 61 , the size of the opening 711 of the light-shielding layer 71 is equal to the size of the three hollow portions 61 and the size of the two strip-shaped conductive structures 62 . Experimental verification shows that the light transmittance of the display substrate shown in FIG6 is increased by approximately 4% relative to the light transmittance of the display substrate shown in FIG1 to FIG3 .

[0076] In one embodiment, as shown in Figures 4 and 5 , the orthographic projection of each of the hollow portions 61 on the second substrate 50 at least partially overlaps with the orthographic projection of an opening 711 of the light shielding layer 71 on the second substrate 50. Since the area where the openings 711 of the light shielding layer 71 are located is the light-transmitting area of ​​the display substrate, by arranging the orthographic projection of the hollow portions 61 on the second substrate 50 to at least partially overlap with the orthographic projection of an opening 711 of the light shielding layer 71 on the second substrate 50, the provision of the hollow portions 61 in the transparent conductive layer 60 can improve the light transmittance of the display substrate, thereby helping to improve the light utilization efficiency of the display substrate.

[0077] In one embodiment, the thickness of the transparent conductive layer 60 is less than or equal to the thickness of the electrostatic release layer 83. When the thickness of the transparent conductive layer 60 is less than the thickness of the electrostatic release layer 83, the light transmittance of the transparent conductive layer 60 can be increased, thereby helping to improve the light transmittance of the display substrate.

[0078] In one embodiment, the transparent conductive layer 60 has a thickness ranging from 120 angstroms to 1200 angstroms. In some embodiments, the transparent conductive layer 60 has a thickness of, for example, 120 angstroms, 200 angstroms, 400 angstroms, 600 angstroms, 800 angstroms, 1000 angstroms, or 1200 angstroms.

[0079] In one embodiment, the minimum thickness of the transparent conductive layer 60 is 10% of the thickness of the electrostatic release layer 83. For example, if the thickness of the electrostatic release layer 83 is 1200 angstroms, the minimum thickness of the transparent conductive layer 60 is 120 angstroms.

[0080] In another embodiment, the thickness of the transparent conductive layer 60 is equal to the thickness of the electrostatic release layer 83. In this configuration, the process parameters used to prepare the transparent conductive layer 60 are the same as the process parameters used to prepare the electrostatic release layer 83, which helps to simplify the preparation process of the display substrate.

[0081] In one embodiment, the material of the transparent conductive layer 60 includes at least one of metal oxides, graphene, metal nanowires, carbon nanotubes, conductive polymers, and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid. Not all of the materials of metal oxides, graphene, metal nanowires, carbon nanotubes, conductive polymers, and poly(3,4-ethylenedioxythiophene)-polystyrene sulfonic acid can be used as the material of the transparent conductive layer 60. Only materials with higher light transmittance among these materials can be used as the material of the transparent conductive layer 60 to reduce the impact on the light transmittance of the display substrate. For example, the material of the transparent conductive layer 60 can be made of metal oxides such as indium tin oxide and indium zinc oxide, which have higher light transmittance.

[0082] In one embodiment, the orthographic projection of the gap between adjacent pixel electrodes 32 in the first substrate 101 on the second substrate 50 falls within the orthographic projection of the transparent conductive layer 60 on the second substrate 50. The accumulation of impurity ions in the display substrate is primarily caused by the horizontal electric field formed between adjacent pixel electrodes 32, and impurity ions are more likely to accumulate in the region where the gap between adjacent pixel electrodes 32 is located. By setting the orthographic projection of the gap between adjacent pixel electrodes 32 in the first substrate 101 on the second substrate 50 to fall within the orthographic projection of the transparent conductive layer 60 on the second substrate 50, an electric field can be formed between the transparent conductive layer 60 and the conductive structure of the first substrate 101 in the region where the gap between adjacent pixel electrodes 32 is located, effectively preventing impurity ions from gathering in the region where the gap between adjacent pixel electrodes 32 is located, thereby more effectively improving the display effect of the display substrate.

[0083] In one embodiment, as shown in Figures 1, 4, and 6, the transparent conductive layer 60 is located between the second substrate 50 and the light shielding layer 71. In other words, the transparent conductive layer 60 can be formed on the second substrate 50. Since the second substrate 50 has a relatively good surface flatness, forming the transparent conductive layer 60 on the second substrate 50 helps to reduce the thickness of the transparent conductive layer 60.

[0084] In some embodiments, as shown in FIG4 and FIG6 , the transparent conductive layer 60 is located between the second substrate 50 and the light shielding layer 71 , and when the transparent conductive layer 60 has a hollow portion 61 , the color filter layer 72 is partially located in the hollow portion 61 of the transparent conductive layer 60 .

[0085] In another embodiment, as shown in FIG2 , the transparent conductive layer 60 is located between the color filter layer 72 and the planar layer 81. Compared to the solution in which the transparent conductive layer 60 is disposed between the light shielding layer 71 and the second substrate 50, the transparent conductive layer 60 located between the color filter layer 72 and the planar layer 81 can reduce the distance between the transparent conductive layer 60 and the first substrate 101. Given a constant area of ​​the transparent conductive layer 60, the electric field strength between the transparent conductive layer 60 and the conductive structure of the first substrate 101 can be increased, thereby better preventing the accumulation of impurity ions.

[0086] In another embodiment, the transparent conductive layer 60 is located between the light shielding layer 71 and the color filter layer 72 , and a portion of the transparent conductive layer 60 may be located within the opening 711 of the light shielding layer 71 .

[0087] In another embodiment, as shown in FIG3 , the transparent conductive layer 60 is located on the side of the planar layer 81 away from the second substrate 50. Furthermore, the transparent conductive layer 60 is located between the planar layer 81 and the second liquid crystal alignment film 82. This arrangement further reduces the distance between the transparent conductive layer 60 and the first substrate 101. Given a constant area of ​​the transparent conductive layer 60, the electric field strength between the transparent conductive layer 60 and the conductive structure of the first substrate 101 is further increased, thereby more effectively preventing the accumulation of impurity ions.

[0088] In one embodiment, as shown in Figures 8 and 9 , the transparent conductive layer 60 is located between the planar layer 81 and the second liquid crystal alignment film 82. The transparent conductive layer 60 has a hollow portion 61. The display substrate further includes a planarization layer 85, which is at least partially located within the hollow portion 61. The provision of the planarization layer 85 can prevent the liquid crystal alignment film 82 from having an uneven film layer.

[0089] In the embodiment shown in FIG8 , the planarization layer 85 is partially located within the hollow portion 61 and partially located on the side of the transparent conductive layer 60 away from the second substrate 50, and the surface of the planarization layer 85 away from the second substrate 50 is substantially flush. In the embodiment shown in FIG9 , the planarization layer 85 is entirely located within the hollow portion 61, and the surface of the planarization layer 85 away from the second substrate 50 is flush with the surface of the transparent conductive layer 60 away from the second substrate 50.

[0090] In another embodiment, when the transparent conductive layer 60 is located between the planar layer 81 and the second liquid crystal alignment film 82 , the thickness of the transparent conductive layer 60 can be set to be very small, for example, 120 angstroms, which helps to improve the flatness of the liquid crystal alignment film 82 .

[0091] In one embodiment, the transparent conductive layer 60 is connected to a constant electrical signal, which can effectively increase the electric field strength between the transparent conductive layer 60 and the conductive structure of the first substrate 101, thereby more effectively preventing the accumulation of impurity ions.

[0092] Furthermore, the electrostatic release layer 83 is connected to a constant electrical signal, and the transparent conductive layer 60 is electrically connected to the electrostatic release layer 83. With this arrangement, the transparent conductive layer 60 is connected to a constant electrical signal by being electrically connected to the electrostatic release layer 83, eliminating the need for signal lines that provide a constant electrical signal to the transparent conductive layer 60, thereby simplifying the structure of the display substrate.

[0093] Furthermore, as shown in FIG10 , the second substrate 102 further includes a conductive portion 84 located on the side of the second substrate 50. The electrostatic release layer 83 and the transparent conductive layer 60 are electrically connected to the conductive portion 84. Providing the conductive portion 84 on the side of the second substrate 50 to achieve electrical connection between the transparent conductive layer 60 and the electrostatic release layer 83 helps reduce the difficulty of manufacturing the display substrate, compared to providing a through-hole in the second substrate 50 to achieve electrical connection between the transparent conductive layer 60 and the electrostatic release layer 83.

[0094] In some embodiments, the conductive portion 84 may cover all side surfaces of the second substrate 50 . In other embodiments, the conductive portion 84 may only cover a portion of the side surfaces of the second substrate 50 .

[0095] In some embodiments, the material of the conductive portion 84 may be the same as the material of the electrostatic release layer 83 or the material of the transparent conductive layer 60, or the material of the conductive portion 84 may be different from the material of the electrostatic release layer 83 and the material of the transparent conductive layer 60. In an exemplary embodiment, the conductive portion 84 may be obtained by coating silver paste on the side of the second substrate 50.

[0096] The following describes the various layers included in the display substrate of the embodiment shown in Figure 1. As shown in Figure 1, the display substrate includes a first substrate 101 and a second substrate 102 disposed opposite each other, and a liquid crystal layer 40 located between the first substrate 101 and the second substrate 102. The liquid crystal layer 40 includes a plurality of liquid crystal molecules, which are negative liquid crystal molecules.

[0097] The first substrate 101 includes a first substrate 10, a driving circuit layer 20, a common electrode 31, and a pixel electrode 32. The driving circuit layer 20, the common electrode 31, and the pixel electrode 32 are all located on the side of the first substrate 10 facing the second substrate 102. The driving circuit layer 20 may include a plurality of pixel circuits. The common electrode 31 is located between the driving circuit layer 20 and the first substrate 10, and the pixel electrode 32 may be located on the side of the driving circuit layer 20 away from the first substrate 10.

[0098] The second substrate 102 includes a second substrate 50, a transparent conductive layer 60, a light shielding layer 71, a color filter layer 72, a planarization layer 81, a liquid crystal alignment film 82, and an electrostatic release layer 83. The transparent conductive layer 60 is located on the side of the second substrate 50 facing the first substrate 101, and its orthographic projection on the second substrate 50 covers the second substrate 50. The light shielding layer 71 is located on the side of the transparent conductive layer 60 facing the first substrate 101 and is provided with a plurality of spaced-apart openings 711. The color filter layer 72 is partially located within the openings 711 and partially located on the side of the light shielding layer 71 facing away from the second substrate 50. The planarization layer 81 is located on the side of the color filter layer 72 facing the first substrate 101, and a portion of the planarization layer 81 may contact the surface of the light shielding layer 71 not covered by the color filter layer 72. The liquid crystal alignment film 82 is located on the side of the planarization layer 81 facing the first substrate 101. The electrostatic release layer 83 is located on the side of the second substrate 50 facing away from the first substrate 101. The orthographic projection of the electrostatic release layer 83 on the second substrate 50 may cover the second substrate 50 .

[0099] Furthermore, the thickness of the second substrate 50, the thickness of the light shielding layer 71, the thickness of the color filter layer 72, and the thickness of the planarization layer 81 are all greater than the thickness of the transparent conductive layer 60. In some embodiments, the thickness of the second substrate 50, the thickness of the light shielding layer 71, the thickness of the color filter layer 72, and the thickness of the planarization layer 81 are all much greater than the thickness of the transparent conductive layer 60.

[0100] Furthermore, the thickness of the light shielding layer 71 may gradually decrease from the area away from the opening 711 to the area close to the opening 711. The surface of the light shielding layer 71 facing the second substrate 50 may be substantially flat, and the surface of the light shielding layer 71 away from the second substrate 50 may be relatively smooth.

[0101] Furthermore, a portion of the color filter layer 72 located on the side of the light shielding layer 71 away from the second substrate 50 and facing the first substrate 101 forms a depression, and the planar layer 81 fills the depression.

[0102] In order to verify the improvement in display effect achieved by the display substrate provided by the embodiment of the present application, a checkerboard test was performed at high temperature using the display substrate shown in FIG1 and a display substrate used as a comparison. The difference between the display substrate used as a comparison and FIG1 is that the second substrate does not include a transparent conductive layer. According to the test results, the display substrate shown in FIG1 did not show any linear stains after continuously displaying the checkerboard pattern for 1000 hours, while the display substrate used as a comparison showed linear stains after continuously displaying the checkerboard pattern for 360 hours. It can be seen that the embodiment of the present application can effectively increase the service life of the display substrate without the appearance of linear stains, and solve the problem of stains on the screen caused by impurity ions in the display substrate.

[0103] In order to verify the effect of the setting of the transparent conductive layer on the brightness of the display substrate, the present application conducts a simulation experiment on two display substrates (hereinafter referred to as the first display substrate and the second display substrate), and in the simulation experiment, the first display substrate and the second display substrate are simulated to display a black and white checkerboard picture. When the second substrate of the first display substrate only includes the second substrate, a simulation experiment is conducted to obtain the brightness of the first display substrate at the junction of the sub-display area displaying black and the sub-display area displaying white; then, after adding a light-shielding layer on the side of the second substrate facing the first substrate, a simulation experiment is conducted to obtain the brightness of the first display substrate at the junction of the sub-display area displaying black and the sub-display area displaying white. After comparison, it was found that after the light-shielding layer was added to the second substrate of the first display substrate, the brightness of the first display substrate at the junction of the sub-display area displaying black and the sub-display area displaying white was reduced by 0.01%. A simulation test was conducted with the second display substrate consisting solely of the second substrate to measure the brightness of the first display substrate at the interface between the black and white sub-display areas. A transparent conductive layer and a light-shielding layer were then added to the side of the second substrate facing the first substrate, with the transparent conductive layer covering the second substrate. Simulation tests were then conducted again to measure the brightness of the second display substrate at the interface between the black and white sub-display areas. Comparison revealed that the addition of the light-shielding layer and the transparent conductive layer reduced the brightness of the first display substrate at the interface between the black and white sub-display areas by 0.004%. Comparing the brightness changes of the first and second display substrates revealed that the addition of the transparent conductive layer increased the brightness of the second display substrate by 60% compared to the brightness of the first display substrate at the interface between the black and white sub-display areas. This is because the transparent conductive layer in the second display substrate prevents impurity ion aggregation, thereby alleviating the reduction in brightness at the interface between the black and white sub-display areas caused by impurity ion aggregation.

[0104] The present invention also simulated the brightness distribution of the first display substrate with a light-shielding layer and the second display substrate with a light-shielding layer and a transparent conductive layer. The simulation results showed that the second display substrate had a more uniform brightness distribution and a better display effect. It can be seen that the transparent conductive layer can improve the uniformity of the brightness distribution of the display substrate by preventing the accumulation of impurity ions.

[0105] The present application also provides a method for preparing a display substrate. The preparation process of the display substrate can be as follows:

[0106] First, a first substrate and a second substrate are prepared.

[0107] Subsequently, a frame sealant is provided on one of the side of the first substrate away from the first underlay and the side of the second substrate away from the electrostatic release layer, and a liquid crystal layer is provided on the other side, and the first substrate and the second substrate are assembled.

[0108] Then, the frame sealing glue is cured.

[0109] The following describes a method for preparing the first substrate using the first substrate of the display substrate shown in FIG1 as an example. The preparation process of the first substrate may include the following steps:

[0110] providing a second substrate;

[0111] forming an electrostatic release layer on one side of the second substrate;

[0112] forming a transparent conductive layer on a side of the second substrate away from the electrostatic release layer;

[0113] forming a light shielding layer with openings on a side of the transparent conductive layer away from the second substrate;

[0114] forming a color filter layer on a side of the transparent conductive layer away from the second substrate, wherein at least a portion of the color filter layer is located within the opening of the light shielding layer;

[0115] forming a flat layer on a side of the color filter layer away from the second substrate;

[0116] forming a second liquid crystal alignment layer on a side of the planar layer away from the second substrate;

[0117] A spacer is formed on a side of the second liquid crystal alignment layer away from the second substrate.

[0118] The embodiment of the method for preparing the display substrate provided in the embodiment of the present application and the embodiment of the display substrate belong to the same inventive concept, and the description of relevant details and beneficial effects can be referred to each other, which will not be repeated here.

[0119] An embodiment of the present application further provides a display device, which includes the display substrate described in any of the above embodiments.

[0120] In one embodiment, the display substrate further includes a backlight source, and the backlight source is located on a side of the first substrate away from the second substrate.

[0121] In some embodiments, the display device further includes a housing, and the display substrate is embedded in the housing.

[0122] The display device provided in the embodiments of the present application may be any appropriate display device, including but not limited to mobile phones, tablet computers, televisions, monitors, laptop computers, digital photo frames, navigators, e-books, and any other products or components with display functions.

[0123] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it may be the only layer between the two layers or elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0124] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0125] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A display substrate, characterized in that: The display substrate comprises a display area; the display substrate comprises a first substrate, a second substrate and a liquid crystal layer; the first substrate and the second substrate are arranged opposite to each other, and the liquid crystal layer is located between the first substrate and the second substrate; The first substrate includes a first substrate, a driving circuit layer located on the side of the first substrate facing the second substrate, and a pixel electrode and a common electrode located on the side of the first substrate facing the second substrate; the second substrate includes a second substrate and a transparent conductive layer located on the side of the second substrate facing the first substrate, and the transparent conductive layer is at least located in the display area.

2. The display substrate according to claim 1, characterized in that: The orthographic projection of the transparent conductive layer on the second substrate covers the second substrate.

3. The display substrate according to claim 1, characterized in that: The transparent conductive layer is provided with a plurality of hollow parts.

4. The display substrate according to claim 3, characterized in that: The second substrate further includes a light shielding layer located on the side of the second substrate facing the first substrate, the light shielding layer is provided with a plurality of openings, and the orthographic projection of each of the hollow portions on the second substrate at least partially overlaps with the orthographic projection of one of the openings on the second substrate.

5. The display substrate according to claim 3, characterized in that: The second substrate further includes at least one patterned functional film layer located on a side of the second substrate facing the first substrate, and an orthographic projection of the transparent conductive layer on the second substrate coincides with an orthographic projection of one of the functional film layers on the second substrate.

6. The display substrate according to claim 5, characterized in that: The second substrate also includes a shading layer and a color filter layer located on the side of the second substrate facing the first substrate, the shading layer is provided with a plurality of openings, and the color filter layer includes at least three sub-color filter layers of different colors; the at least one patterned functional film layer includes the shading layer and the sub-color filter layer.

7. The display substrate according to claim 3, characterized in that: The transparent conductive layer includes a plurality of strip-shaped conductive structures. The plurality of strip-shaped conductive structures extend in the same direction, and adjacent strip-shaped conductive structures are arranged at intervals.

8. The display substrate according to claim 1, characterized in that: The second substrate further includes a light shielding layer located on a side of the second substrate facing the first substrate and having an opening, and a color filter layer at least partially located in the opening; The transparent conductive layer is located between the second substrate and the light shielding layer.

9. The display substrate according to claim 1, characterized in that: The second substrate further includes a light shielding layer located on a side of the second substrate facing the first substrate and having an opening, a color filter layer at least partially located in the opening, and a flat layer located on a side of the color filter layer away from the second substrate; The transparent conductive layer is located between the color filter layer and the flat layer.

10. The display substrate according to claim 1, characterized in that: The second substrate further includes a light shielding layer located on a side of the second substrate facing the first substrate and having an opening, a color filter layer at least partially located in the opening, and a flat layer located on a side of the color filter layer away from the second substrate; The transparent conductive layer is located on a side of the planar layer away from the second substrate.

11. The display substrate according to claim 1, characterized in that: The second substrate further comprises an electrostatic release layer located on a side of the second substrate away from the first substrate; The thickness of the transparent conductive layer is less than or equal to the thickness of the electrostatic release layer.

12. The display substrate according to claim 11, characterized in that: The minimum thickness of the transparent conductive layer is equal to 10% of the thickness of the electrostatic release layer.

13. The display substrate according to claim 1, characterized in that: The transparent conductive layer is connected to a constant electrical signal.

14. The display substrate according to claim 13, characterized in that: The second substrate further comprises an electrostatic release layer located on a side of the second substrate away from the first substrate, the electrostatic release layer being connected to a constant electrical signal; The transparent conductive layer is electrically connected to the electrostatic release layer.

15. The display substrate according to claim 14, characterized in that: The second substrate further includes a conductive portion located at a side of the second substrate, and the electrostatic release layer and the transparent conductive layer are electrically connected to the conductive portion respectively.

16. The display substrate according to claim 1, characterized in that: The transparent conductive layer is in contact with the second substrate, and the orthographic projection of the transparent conductive layer on the second substrate covers the second substrate; the second substrate further includes a shading layer located on a side of the transparent conductive layer away from the second substrate, a color filter layer at least partially located on a side of the shading layer away from the second substrate, a planarization layer located on a side of the color filter layer away from the second substrate, and a liquid crystal orientation film located on a side of the planarization layer away from the second substrate.

17. The display substrate according to claim 16, characterized in that: The thickness of the second substrate, the thickness of the light shielding layer, the thickness of the color filter layer and the thickness of the planar layer are all greater than the thickness of the transparent conductive layer.

18. The display substrate according to claim 1, characterized in that: The first substrate includes a plurality of pixel electrodes arranged at intervals, and an orthographic projection of a gap between adjacent pixel electrodes on the second substrate falls within an orthographic projection of the transparent conductive layer on the second substrate.

19. The display substrate according to claim 1, characterized in that: The material of the transparent conductive layer includes at least one of metal oxide, graphene, metal nanowire, carbon nanotube, conductive polymer and poly (3,4-ethylenedioxythiophene) -polystyrene sulfonic acid.

20. A display device, characterized in that: The display device comprises the display substrate according to any one of claims 1 to 19.

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