Display substrate, preparation method thereof and display device

Abstract

This application provides a display substrate, a method for fabricating the same, and a display device. The display substrate includes a substrate; a plurality of light-emitting units located on one side of the substrate; a filter layer located on the side of the light-emitting units away from the substrate, the filter layer including a plurality of spaced color resist blocks, each color resist block corresponding to one of the light-emitting units; a first light-adjusting element and a second light-adjusting element disposed between adjacent color resist blocks, the first light-adjusting element and the second light-adjusting element forming a trench; a light-transmitting layer filling the trench, and the refractive index of the light-transmitting layer being greater than the refractive indices of the first light-adjusting element and the second light-adjusting element; and a glass cover plate located on the side of the filter layer away from the substrate. The display device includes this display substrate.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display substrate, its preparation method, and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs), also known as organic electroluminescence displays or organic electroluminescence displays, are devices that emit light through carrier injection and recombination under the influence of an electric field, involving organic semiconductor materials and light-emitting materials.

[0003] Under ambient light, the display panel's outdoor visibility is low due to the reflection of external light by the cathode metal. Related technologies aim to reduce the reflectivity of ambient light on the display panel by integrating a color filter on the encapsulation (COE) layer. However, because the COE has higher transmittance, more external ambient light enters the display panel and is reflected, thus failing to further improve the display panel's visibility. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a display substrate, a method for preparing the same, and a display device.

[0005] In a first aspect, this application provides a display substrate, comprising:

[0006] Substrate;

[0007] Multiple light-emitting units are located on one side of the substrate.

[0008] A filter layer is located on the side of the light-emitting unit away from the substrate. The filter layer includes a plurality of color resist blocks arranged at intervals, and the plurality of color resist blocks correspond one-to-one with the plurality of light-emitting units. A first light-adjusting element and a second light-adjusting element are provided between adjacent color resist blocks, and a groove is formed between the first light-adjusting element and the second light-adjusting element.

[0009] A light-transmitting layer that fills the groove, and the refractive index of the light-transmitting layer is greater than the refractive index of the first light-adjusting element and the second light-adjusting element;

[0010] A glass cover is located on the side of the filter layer away from the substrate.

[0011] In a second aspect, this application provides a display device including a display substrate as described in the first aspect.

[0012] In a third aspect, this application provides a method for preparing a display substrate, wherein the display substrate includes a substrate.

[0013] The preparation method includes:

[0014] Multiple light-emitting units are formed on one side of the substrate.

[0015] A filter layer is formed on the side of the light-emitting unit away from the substrate; wherein the filter layer includes a plurality of color resist blocks spaced apart, and the plurality of color resist blocks correspond one-to-one with the plurality of light-emitting units;

[0016] A first light-adjusting element and a second light-adjusting element are formed between adjacent color blocks;

[0017] A groove is formed between the first light adjustment element and the second light adjustment element;

[0018] A light-transmitting layer is formed within the groove; wherein the refractive index of the light-transmitting layer is greater than the refractive index of the first light-adjusting element and the second light-adjusting element;

[0019] A glass cover is formed on the side of the filter layer away from the substrate.

[0020] As can be seen from the above, the display substrate and its preparation method and display device provided in this application form a trench and a light adjustment component in the filter layer of the display substrate, and fill the trench with a special material to form a light-transmitting layer, so that the ambient light is totally reflected through the light adjustment component and the light-transmitting layer, thereby maximizing the light extraction efficiency of the OLED display panel, improving the contrast of the display panel, and thus improving the visibility of the display panel. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1A A schematic diagram of an exemplary display substrate 100A is shown.

[0023] Figure 1B A schematic diagram of another exemplary display substrate 100B is shown.

[0024] Figure 2 A schematic diagram of an exemplary display substrate 200 provided in this application is shown.

[0025] Figure 3 A schematic diagram of another exemplary display substrate 200 provided in this application is shown.

[0026] Figures 4A to 4E A schematic diagram of a method for fabricating an exemplary display substrate 200 provided in this application is shown.

[0027] Figure 5 A schematic diagram of another exemplary display substrate 200 provided in this application is shown.

[0028] Figure 6 A schematic diagram of another exemplary display substrate 200 provided in this application is shown.

[0029] Figures 7A to 7D A schematic diagram of another exemplary method for fabricating a display substrate 200 provided in this application is shown.

[0030] Figure 8 A schematic diagram of the display device provided in this application is shown.

[0031] Figure 9 A flowchart illustrating a method for fabricating an exemplary display substrate 200 provided in this application is shown. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0033] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] Figure 1A A schematic diagram of an exemplary display substrate 100A is shown.

[0035] like Figure 1AAs shown, the display substrate 100A can be an OLED display substrate and may include a planarization layer (PLN) 101, a pixel definition layer (PDL) 102 disposed on the planarization layer 101, a plurality of light-emitting units 10 located on the pixel definition layer 102, a cathode layer (CTD) 104 disposed on the pixel definition layer 102, a retardation layer (TFE) 105 disposed on the cathode layer 104, a retardation layer 106 disposed on the retardation layer 105, a polarizing layer 107 (e.g., polyvinyl alcohol PVA) disposed on the retardation layer 106, and a protective layer 108 (e.g., cellulose triacetate TAC) disposed on the polarizing layer 107. The plurality of light-emitting units 10 may further include a plurality of RGB sub-pixels 103 and a plurality of anodes 1021.

[0036] For OLEDs, the reflection of ambient light by their cathode metal results in low outdoor visibility. In related technologies, this reflection can typically be reduced by attaching a polarizer. For example... Figure 1A As shown, light 1073 is reflected as right-circularly polarized light 1075 after passing through polarizer 1071 (e.g., a quarter-wave plate) in polarizing layer 107. The angle of light 1073 is deflected, and after being reflected by cathode layer 104, it becomes left-circularly polarized light 1074. Left-circularly polarized light 1074 is reflected in other directions after passing through polarizer 1072 (e.g., a quarter-wave plate) in polarizing layer 107. Thus, because the angle of light 1073 is deflected before passing through cathode layer 104, the reflection of external light by the cathode metal is reduced. However, the polarizer only reduces the reflection of light in the cathode metal layer. Due to the low light transmittance of the polarizer, the problem of low outdoor visibility of the display still exists. In view of this, in related technologies, a COE structure with high transmittance is used to replace the polarizer to improve the visibility of the display.

[0037] Figure 1B A schematic diagram of another exemplary display substrate 100B is shown.

[0038] like Figure 1BAs shown, the display substrate 100B may include a planarization layer 101, a pixel definition layer 102 disposed on the planarization layer 101, a plurality of light-emitting units 10 disposed on the pixel definition layer 102, a cathode layer 104 disposed on the pixel definition layer 102, an encapsulation layer 105 disposed on the cathode layer 104, a COE 11 disposed on the encapsulation layer 105, and a protective layer 111 (e.g., optical adhesive OC) disposed on the COE 11. The plurality of light-emitting units 10 may further include a plurality of RGB sub-pixels 103 and a plurality of anodes 1021. The COE 11 may further include a filter layer 110 and a black matrix (BM) layer 109, and the filter layer 110 may further include a plurality of RGB color blocks 1101 located within the openings of the black matrix layer 109.

[0039] When light 1073 enters the OLED display panel, some of the light passing through the black matrix layer 109 is absorbed because the black matrix layer 109 is opaque. After being filtered by color resists 1101 of different colors, the light 1073 enters the interior of the display panel as monochromatic light. It is then reflected by the internal layer structure of the display panel and returns to the filter layer 110, where diffraction occurs at each color resist 1101, thereby reducing light reflection on the display panel. Furthermore, color resists have higher light transmittance than polarizers; therefore, using a COE structure instead of a polarizer can improve light transmittance and thus enhance the display's visibility. However, the higher transmittance of the COE also means that more ambient light will enter the display panel, increasing reflection at the cathode metal layer and weakening diffraction at the color resists, thus reducing the display panel's visibility.

[0040] In view of this, this application proposes a display substrate that forms trenches and light-adjusting components in the filter layer of the display substrate, and fills the trenches with a special material to form a light-transmitting layer, so that ambient light undergoes total internal reflection through the light-adjusting components and the light-transmitting layer, thereby maximizing the light extraction efficiency of the OLED display panel, improving the contrast of the display panel, and thus enhancing the visibility of the display panel.

[0041] Figure 2 A schematic diagram of an exemplary display substrate 200 provided in this application is shown.

[0042] like Figure 2As shown, the display substrate 200 may include a substrate 201 (e.g., polyimide PI), a planarization layer (PLN) 202 disposed on the substrate 201, a pixel definition layer (PDL) 203 disposed on the planarization layer 202, a plurality of light-emitting units 20 and spacers 2033 located on the pixel definition layer 203, a cathode layer (CTD) 210 disposed on the pixel definition layer 203, and a first insulating layer (CVD) 209 disposed on the cathode layer 210. The plurality of light-emitting units 20 may further include a plurality of sub-pixels 2031 and a plurality of anodes 2032.

[0043] To improve the light extraction efficiency of OLED display panels, in some embodiments, such as Figure 2 As shown, multiple light-adjusting elements 2081 with trapezoidal cross-sections can be integrally formed on the glass cover plate (CG) 207, with the apex angle of the trapezoids ranging from 110 degrees to 135 degrees. A light filter layer 208 is formed on the side of the glass cover plate 207 near the substrate 201. The light filter layer 208 may further include multiple color resist blocks 2082 spaced apart, with each color resist block 2082 corresponding to a multiple light-emitting unit 20. The material of the color resist block 2082 may be a resin with a refractive index of 1.6 to 1.7. A first light-adjusting element 2084 and a second light-adjusting element 2085 are provided between adjacent color resist blocks 2082, and a groove is formed between the first light-adjusting element 2084 and the second light-adjusting element 2085, which is filled with a light-transmitting layer 2083. The material of the light-transmitting layer 2083 may be a second optical adhesive with a refractive index of 1.65 to 1.75. The glass cover 207 can be made of glass with a refractive index of 1.47. Since the light-adjusting element 2081 (e.g., the first light-adjusting element 2084 and the second light-adjusting element 2085) is integrally formed with the glass cover 207, the material of the light-adjusting element 2081 is also glass with a refractive index of 1.47. In order to prevent the black matrix layer located in the filter layer from blocking light 211 as in the related art, the black matrix layer 2041 can be disposed on the first insulating layer 209. At the same time, an organic encapsulation layer (IJP) 204 is formed on the first insulating layer 209, a second insulating layer 205 is formed on the organic encapsulation layer 204, an optical adhesive layer (OCA) 206 is formed on the second insulating layer 205, and a filter layer 208 is formed on the optical adhesive layer 206.

[0044] The refractive index of the light-transmitting layer 2083 (1.65 to 1.75) is greater than the refractive index (1.47) of the light-adjusting element 2081 (e.g., the first light-adjusting element 2084 and the second light-adjusting element 2085), and the refractive index (1.6 to 1.7) of the color resist block 2082 is greater than the refractive index (1.47) of the light-adjusting element 2081 (e.g., the first light-adjusting element 2084 and the second light-adjusting element 2085). Simultaneously, the apex angle of the light-adjusting element 2081 (i.e., the slope of the inclined surface of the light-adjusting element 2081) is 110 degrees to 135 degrees, so that the incident angle of light on the inclined surface can reach the critical angle. Figure 2 As shown, this arrangement causes the light 211 emitted from the light-emitting unit 20 to pass through the color resist block 2082 (optically dense medium) and the light modulator 2081 (optically rarer medium), and then undergo total internal reflection at the tilted surface of the light modulator 2081. Because the black matrix layer 2041 is moved below the filter layer in related technologies, the problem of the black matrix layer 2041 blocking the light 211 from entering the light-transmitting layer 2083 is avoided. Therefore, the light 211, passing through the light-transmitting layer 2083 (optically dense medium) and the light modulator 2081 (optically rarer medium), also undergoes total internal reflection at the tilted surface of the light modulator 2081. This arrangement improves the light emission efficiency of the display panel through total internal reflection, thereby enhancing the contrast and visibility of the display panel.

[0045] In some embodiments, to prevent the black matrix layer 2041 from blocking the light emitted by the light-emitting unit 20, the orthographic projections of the black matrix layer 2041 and the light-emitting unit 20 on the display substrate can be configured not to overlap. For example, as... Figure 2 As shown, the length of the black matrix layer 2041 in the cross-section of the display substrate (the dimension in the coordinate BB' direction) can be set to be less than or equal to the length of the partition 2033 in the cross-section of the display substrate (the dimension in the coordinate BB' direction).

[0046] In some embodiments, in order to allow more light to be filtered by the color resist block 2082, the area of ​​the color resist block 2082 projected onto the display substrate can be set to be greater than or equal to the area of ​​the light-emitting unit 20 projected onto the display substrate. For example, as Figure 2 As shown, the length of the color resist block 2082 on the cross-section of the display substrate (the dimension in the coordinate BB' direction) is greater than or equal to the length of the light-emitting unit 20 on the cross-section of the display substrate (the dimension in the coordinate BB' direction), with an error range between 0 and 5 square micrometers.

[0047] In some embodiments, in order to ensure the contact area between the light modulator 2081 and the light 211, the height (dimension in the direction of coordinate AA') of the light modulator 2081 on the cross-section of the display substrate is 2 to 5 micrometers.

[0048] In some embodiments, to avoid blocking the light emitted by the light-emitting unit 20, the orthographic projections of the first light-adjusting member 2084, the second light-adjusting member 2085, and the light-transmitting layer 2083 on the display substrate are configured not to overlap with the orthographic projection of the light-emitting unit 20 on the display substrate. For example, as Figure 2 As shown, the lengths (dimensions in the coordinate BB' direction) of the first light adjustment element 2084, the second light adjustment element 2085, and the light-transmitting layer 2083 in the cross-section of the display substrate are less than or equal to the lengths (dimensions in the coordinate BB' direction) of the partition 2033 in the cross-section of the display substrate.

[0049] like Figure 3 As shown, as an optional embodiment, in order to improve the light extraction efficiency of the OLED display panel while maintaining the consistency of the emitted light color, the transmittance layer 2083 can be set as a resin material with a refractive index of 1.6 to 1.7 for two colors (e.g., a first light-transmitting unit 2086 and a second light-transmitting unit 2087 disposed between the first color resist block 2082 and the second color resist block 2088), and color resist blocks of the same color are alternately arranged with the transmittance layer. For example, as Figure 3 As shown, the first color block 2082 and the first light-transmitting unit 2086 have the same color, and the second color block 2088 and the second light-transmitting unit 2087 have the same color. The first light-transmitting unit 2086 can be located between the second light-transmitting unit 2087 and the second color block 2088, and the second light-transmitting unit 2087 can be located between the first light-transmitting unit 2086 and the first color block 2082.

[0050] By using this alternating color arrangement, the light 211 emitted by the light-emitting unit 20 can be filtered through a light-transmitting layer of the same color. Simultaneously, since the material of the light-transmitting layer is a resin with a refractive index of 1.6 to 1.7, for example... Figure 3 As shown, the refractive index of the second light-transmitting unit 2087 (1.6 to 1.7) is greater than that of the light-adjusting element 2081 (1.47), and the slope of the light-adjusting element 2081 causes the incident angle of the light ray 211 on the inclined surface to reach the critical angle. Therefore, the light ray 211 passing through the second light-transmitting unit 2087 and the light-adjusting element 2081 can also undergo total internal reflection on the inclined surface of the adjusting element 2081. Simultaneously, the light ray 211 passing through the color resist block 2088 and the light-adjusting element 2081 also undergoes total internal reflection on the inclined surface of the light-adjusting element 2081. Therefore, setting the light-transmitting layer as a resin material with alternating colors can also achieve the purpose of improving light extraction efficiency. It can be understood that if the colors of the light-transmitting layer and the color resist block are not alternating, then the light will be absorbed by the light-transmitting layer when passing through different colored light-transmitting layers and cannot be filtered, thus total internal reflection cannot occur.

[0051] In some embodiments, the distance between the first light-transmitting unit 2086 and the second light-transmitting unit 2087 is set between 0 and 5 micrometers to prevent the gap between the first light-transmitting unit 2086 and the second light-transmitting unit 2087 from being too large, causing light to leak out from the gap. At the same time, the first light-transmitting unit 2086 and the second light-transmitting unit 2087 can completely overlap, but cannot overlap, otherwise the overlapping part will generate thickness, affecting the flatness of the display substrate.

[0052] In some embodiments, the orthographic projections of the first light-transmitting unit 2086 and the second light-transmitting unit 2087 on the display substrate can overlap. For example, as... Figure 3 As shown, the overlapping portion of the first light-transmitting unit 2086 and the second light-transmitting unit 2087 can be tilted in the direction of coordinate B or in the direction of coordinate B', so as to reduce the difficulty of setting the overlapping portion of the first light-transmitting unit 2086 and the second light-transmitting unit 2087 to be perpendicular to the cross-section of the display substrate in the direction of coordinate AA'.

[0053] Figures 4A to 4E A schematic diagram of a method for fabricating an exemplary display substrate 200 provided in this application is shown.

[0054] like Figure 4A As shown, in some embodiments, the display substrate 200 can be fabricated using patterning processes (e.g., mask exposure and hydrofluoric acid etching). Photoresist (e.g., PR resin) 403 is coated on a glass cover plate 207 and exposed through a mask 402. A pattern 404 to be left after exposure is pre-defined on the mask 402. Under the cover of the mask 402, the photoresist 403 is exposed using an exposure process. After being irradiated by light 401, the pattern 404 is formed on the photoresist 403. Figure 4B As shown, the exposed photoresist is removed through a developing process, leaving a pattern 404 on the glass cover plate 207. Figure 4C As shown, protrusions with an inverted trapezoidal cross-section are etched onto the glass cover plate 207 using an etching process (e.g., hydrofluoric acid etching), forming grooves 405 between adjacent protrusions. Figure 4D As shown, a light-transmitting layer 2083 (e.g., an optical adhesive with a refractive index of 1.65 to 1.75 or two colors of resin with a refractive index of 1.6 to 1.7) is filled within the groove 405. Figure 4EAs shown, a color resist block 2082 is then prepared. It is understood that during the preparation of the color resist block 2082, the precision of the manufacturing process sometimes cannot guarantee that the height of the color resist block 2082 is exactly equal to the height of the protrusion. Therefore, the height of the color resist block 2082 can be slightly larger or slightly smaller than the height of the protrusion, with an error range of 0 to 5 micrometers. When the height of the color resist block 2082 is slightly larger than the protrusion, the excess portion of the color resist block 2082 is located in the optical adhesive layer; when the height of the color resist block 2082 is slightly smaller than the protrusion, the optical adhesive layer fills part of the location of the color resist block 2082. Finally, the prepared glass cover plate 207 is cut, flipped, and then optically transparent adhesive (e.g., OCA or OCR) is used to bond the flipped glass cover plate 207 to the second insulating layer 205, forming a shape as shown. Figure 2 or Figure 3 The display substrate 200 shown.

[0055] As an optional embodiment, such as Figure 5 As shown, the light-adjusting element 501 may not be integrally formed with the glass cover plate 207. A light-adjusting element 501 (e.g., a first light-adjusting element 502, a second light-adjusting element 503) with a trapezoidal cross-section is fabricated on the glass cover plate 207 using a first optical adhesive (e.g., an optical adhesive material) with a refractive index of 1.45 to 1.5. In this case, the refractive index of the light-transmitting layer 2083 (1.65 to 1.75) is greater than the refractive index of the light-adjusting element 501 (1.45 to 1.5), and the refractive index of the color resist block 2082 (1.6 to 1.7) is also greater than the refractive index of the light-adjusting element 2081 (1.47). Simultaneously, the slope of the inclined surface of the light adjustment element 501 is set to 110 to 135 degrees, so that the incident angle of the light 211 on the inclined surface reaches the critical angle. Thus, the light 211 passes through the light-transmitting layer 2083 (optically denser medium) and the light adjustment element 501 (optically less dense medium), and undergoes total internal reflection at the inclined surface of the light adjustment element 501. The light 211 also undergoes total internal reflection at the inclined surface of the light adjustment element 501 after passing through the color resist block 2082 (optically denser medium) and the light adjustment element 501 (optically less dense medium). Therefore, this arrangement can also improve the light emission efficiency of the display panel through total internal reflection, thereby enhancing the contrast and visibility of the display panel.

[0056] In some embodiments, to prevent the black matrix layer 2041 from blocking the light emitted by the light-emitting unit 20, the orthographic projections of the black matrix layer 2041 and the light-emitting unit 20 on the display substrate can be configured not to overlap. For example, as... Figure 5 As shown, the length of the black matrix layer 2041 in the cross-section of the display substrate (the dimension in the coordinate BB' direction) can be set to be less than or equal to the length of the partition 2033 in the cross-section of the display substrate (the dimension in the coordinate BB' direction).

[0057] In some embodiments, in order to allow more light to be filtered by the color resist block 2082, the area of ​​the color resist block 2082 projected onto the display substrate can be set to be greater than or equal to the area of ​​the light-emitting unit 20 projected onto the display substrate. For example, as Figure 5 As shown, the length of the color resist block 2082 on the cross-section of the display substrate (the dimension in the coordinate BB' direction) is greater than or equal to the length of the light-emitting unit 20 on the cross-section of the display substrate (the dimension in the coordinate BB' direction), with an error range between 0 and 5 square micrometers.

[0058] In some embodiments, in order to ensure the contact area between the light modulator 501 and the light 211, the height (dimension in the direction of coordinate AA') of the light modulator 501 on the cross-section of the display substrate is 2 to 5 micrometers.

[0059] In some embodiments, to avoid blocking the light emitted by the light-emitting unit 20, the orthographic projections of the first light-adjusting member 502, the second light-adjusting member 503, and the light-transmitting layer 2083 on the display substrate are configured not to overlap with the orthographic projection of the light-emitting unit 20 on the display substrate. For example, as Figure 5 As shown, the lengths (dimensions in the coordinate BB' direction) of the first light adjustment element 502, the second light adjustment element 503, and the light-transmitting layer 2083 in the cross-section of the display substrate are less than or equal to the lengths (dimensions in the coordinate BB' direction) of the partition 2033 in the cross-section of the display substrate.

[0060] As an optional embodiment, such as Figure 6 As shown, when the light-adjusting element 501 is an optical adhesive material with a refractive index of 1.45 to 1.5, in order to improve the light extraction efficiency of the OLED display panel while maintaining the consistency of the emitted light color, the light-transmitting layer 2083 can also be set as two resin materials with alternating refractive indices of 1.6 to 1.7. In this case, as... Figure 6 As shown, the slope of the inclined surface of the light adjustment element 501 remains between 110 and 135 degrees so that the incident angle of light 211 on the inclined surface reaches the critical angle. The refractive index (1.6 to 1.7) of the second light-transmitting unit 2087 is greater than that of the light adjustment element 501 (1.45 to 1.5), therefore, light 211 can undergo total internal reflection on the inclined surface of the light adjustment element 501. Light 211 passing through the color resist block 2088 (optically dense medium) and the light adjustment element 501 (optically rarer medium) also undergoes total internal reflection on the inclined surface of the light adjustment element 501. Therefore, this embodiment can also improve the light emission efficiency of the display panel through total internal reflection, thereby improving the contrast and visibility of the display panel. It is understood that if the colors of the light-transmitting layer and the color resist block are not alternately arranged, then light will be absorbed by the light-transmitting layer when passing through the light-transmitting layer of different colors and cannot be filtered, thus total internal reflection cannot occur.

[0061] In some embodiments, the distance between the first light-transmitting unit 2086 and the second light-transmitting unit 2087 is set between 0 and 5 micrometers to prevent the gap between the first light-transmitting unit 2086 and the second light-transmitting unit 2087 from being too large, causing light to leak out from the gap. At the same time, the first light-transmitting unit 2086 and the second light-transmitting unit 2087 can completely overlap, but cannot overlap, otherwise the overlapping part will generate thickness, affecting the flatness of the display substrate.

[0062] In some embodiments, the orthographic projections of the first light-transmitting unit 2086 and the second light-transmitting unit 2087 on the display substrate can overlap. For example, as... Figure 6 As shown, the overlapping portion of the first light-transmitting unit 2086 and the second light-transmitting unit 2087 can be tilted in the direction of coordinate B or in the direction of coordinate B', so as to reduce the difficulty of setting the overlapping portion of the first light-transmitting unit 2086 and the second light-transmitting unit 2087 to be perpendicular to the cross-section of the display substrate in the direction of coordinate AA'.

[0063] Figures 7A to 7D A schematic diagram of another exemplary method for fabricating a display substrate 200 provided in this application is shown.

[0064] like Figure 7A As shown, in some embodiments, when preparing the light-adjusting element 501, the material for preparing the light-adjusting element 501 (e.g., optical adhesive) is coated onto the glass cover plate 207 and exposed through a mask 702. The mask 702 has a pattern pre-formed on it to be left after exposure; it is understood that this pattern can be adjusted according to design requirements during the mask exposure and development process. Under the cover of the mask 702, the pattern on the mask 702 is exposed onto the optical adhesive through an exposure process. After being irradiated by light 701, as... Figure 7B As shown, an inverted trapezoidal light adjustment element 501 is formed on the glass cover plate 207. (As shown...) Figure 7CAs shown, grooves are formed between the light-adjusting elements 501, and a light-transmitting layer 2083 (e.g., an optical adhesive with a refractive index of 1.65 to 1.75 or two colors of resin with a refractive index of 1.6 to 1.7) is filled in the grooves. As shown in 7D, a color resist block 2082 is then fabricated. It is understood that during the fabrication of the color resist block 2082, the precision of the fabrication process sometimes cannot guarantee that the height of the color resist block 2082 is exactly equal to the height of the protrusion. Therefore, the height of the color resist block 2082 can be slightly larger or slightly smaller than the height of the protrusion, with an error range of 0 to 5 micrometers. When the height of the color resist block 2082 is slightly larger than the protrusion, the excess portion of the color resist block 2082 is located in the optical adhesive layer; when the height of the color resist block 2082 is slightly smaller than the protrusion, the optical adhesive layer fills the portion where the color resist block 2082 is located. Finally, the prepared glass cover plate 207 is cut, flipped, and then bonded to the second insulating layer 205 using optically transparent adhesive (e.g., OCA or OCR) to form a... Figure 5 or Figure 6 The display substrate 200 shown.

[0065] This application also provides a display device. Figure 8 A schematic diagram of a display device provided in an embodiment of this application is shown.

[0066] like Figure 8 As shown, this embodiment provides a display device 801, including a display substrate 8011. The display substrate 8011 is any embodiment of the aforementioned display substrate or an arrangement or combination of embodiments. The display device is a product with image display function, such as: a monitor, television, billboard, digital photo frame, laser printer with display function, telephone, mobile phone, personal digital assistant (PDA), digital camera, portable camcorder, viewfinder, navigator, vehicle, large-area wall, home appliance, information query equipment (such as e-government, banking, hospital, power and other departments' business query equipment, monitors, etc.).

[0067] This application also provides a method for preparing a display substrate. Figure 9 A flowchart illustrating a method for fabricating an exemplary display substrate 200 provided in this application is shown.

[0068] This embodiment provides a method for fabricating a display substrate, the display substrate including a substrate. For example... Figure 9 As shown, the method for fabricating this display substrate includes:

[0069] S901: A plurality of light-emitting units are formed on one side of the substrate;

[0070] S903: A filter layer is formed on the side of the light-emitting unit away from the substrate; wherein the filter layer includes a plurality of color resist blocks spaced apart, and the plurality of color resist blocks correspond one-to-one with the plurality of light-emitting units;

[0071] S905: A first light adjustment element and a second light adjustment element are formed between adjacent color resist blocks;

[0072] S907: A groove is formed between the first light adjustment member and the second light adjustment member;

[0073] S909: A light-transmitting layer is formed in the groove; wherein the refractive index of the light-transmitting layer is greater than the refractive index of the first light-adjusting element and the second light-adjusting element;

[0074] S911: A glass cover is formed on the side of the filter layer away from the substrate.

[0075] In some embodiments, the refractive index of the color block is greater than the refractive index of the first light adjustment element and the second light adjustment element.

[0076] In some embodiments, the display substrate further includes a black matrix layer located on the side of the light-emitting unit away from the substrate. The fabrication method further includes setting the black matrix layer and the orthogonal projection of the light-emitting unit on the display substrate to not overlap.

[0077] In some embodiments, the preparation method further includes: setting the cross-section of the first light adjustment member and the second light adjustment member to be trapezoidal, wherein the apex angle of the trapezoid is 110 degrees to 135 degrees.

[0078] In some embodiments, the preparation method further includes: the material forming the first light-adjusting element and the second light-adjusting element is glass or a first optical adhesive.

[0079] In some embodiments, the preparation method further includes: forming a first light modulator and a second light modulator with a height of 2 micrometers to 5 micrometers.

[0080] In some embodiments, the preparation method further includes: the first light adjustment element, the second light adjustment element and the glass cover plate are integrally formed.

[0081] In some embodiments, the preparation method further includes: setting the orthographic projection of the first light adjustment element, the second light adjustment element, and the light-transmitting layer on the display substrate to not overlap with the orthographic projection of the light-emitting unit on the display substrate.

[0082] In some embodiments, the preparation method further includes: the material forming the light-transmitting layer is a second optical adhesive.

[0083] In some embodiments, the preparation method further includes: the material forming the color block is resin.

[0084] In some embodiments, the plurality of color resist blocks include a first color resist block and a second color resist block disposed adjacent to each other, and the light-transmitting layer includes a first light-transmitting unit and a second light-transmitting unit disposed between the first color resist block and the second color resist block, wherein the first color resist block and the first light-transmitting unit have the same color, and the second color resist block and the second light-transmitting unit have the same color; the preparation method further includes: disposing the first light-transmitting unit between the second light-transmitting unit and the second color resist block, and disposing the second light-transmitting unit between the first light-transmitting unit and the first color resist block.

[0085] In some embodiments, the preparation method further includes: setting the orthogonal projection of the light-emitting unit on the display substrate to be located inside the orthogonal projection of the color resist block on the display substrate.

[0086] In some embodiments, the display substrate further includes an insulating layer and an optical adhesive layer, and the preparation method further includes: forming an insulating layer on the side of the black matrix layer away from the substrate, and forming an optical adhesive layer between the filter layer and the insulating layer.

[0087] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0088] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this application, the well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be shown in block diagram form to avoid obscuring the embodiments of this application, and this also takes into account the fact that the details of the implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this application will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details (e.g., circuits) have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that the embodiments of this application can be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0089] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0090] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A display substrate, characterized by, include: Substrate; Multiple light-emitting units are located on one side of the substrate. A filter layer is located on the side of the light-emitting unit away from the substrate. The filter layer includes a plurality of color resist blocks spaced apart, and the plurality of color resist blocks correspond one-to-one with the plurality of light-emitting units. A light adjustment element is provided between adjacent color resist blocks. The light adjustment element includes a first light adjustment element and a second light adjustment element, and a trench is formed between the first light adjustment element and the second light adjustment element. A light-transmitting layer that fills the groove, and the refractive index of the light-transmitting layer is greater than the refractive index of the first light-adjusting element and the second light-adjusting element; A glass cover plate is located on the side of the filter layer away from the substrate. The light-adjusting component is integrally formed on the glass cover plate through a patterned etching process; the contact surface between the light-adjusting component and the glass cover plate does not coincide with the orthographic projection of the color block and the light-transmitting layer on the glass cover plate. The light-transmitting layer and the light-filtering layer are pre-formed on the glass cover plate. The side of the glass cover plate where the light-transmitting layer and the light-filtering layer are formed is connected to the side of the light-emitting unit away from the substrate by an optical adhesive layer, so that the optical adhesive layer compensates for the height deviation between the light-filtering layer and the light-adjusting element caused by manufacturing errors.

2. The display substrate of claim 1, wherein, The refractive index of the color block is greater than that of the first light-adjusting element and the second light-adjusting element.

3. The display substrate of claim 1, wherein, The display substrate further includes: A black matrix layer is located on the side of the light-emitting unit away from the substrate; the orthographic projections of the black matrix layer and the light-emitting unit on the display substrate do not overlap.

4. The display substrate of claim 1, wherein, The cross-sections of the first light adjustment element and the second light adjustment element are trapezoidal, and the apex angle of the trapezoid is 110 degrees to 135 degrees. 5.The display substrate of claim 1, wherein, The height of the first light adjustment element and the second light adjustment element is 2 micrometers to 5 micrometers. 6.The display substrate of claim 1, wherein, The orthographic projections of the first light-adjusting element, the second light-adjusting element, and the light-transmitting layer on the display substrate do not overlap with the orthographic projection of the light-emitting unit on the display substrate.

7. The display substrate of claim 1, wherein, The material of the light-transmitting layer is a second optical adhesive. 8.The display substrate of claim 1, wherein, The material of the color resist block is resin. 9.The display substrate of claim 1, wherein, The plurality of color resist blocks include a first color resist block and a second color resist block arranged adjacent to each other. The light-transmitting layer includes a first light-transmitting unit and a second light-transmitting unit disposed between the first color resist block and the second color resist block. The first color resist block and the first light-transmitting unit have the same color, and the second color resist block and the second light-transmitting unit have the same color. The first light-transmitting unit is located between the second light-transmitting unit and the second color resist block, and the second light-transmitting unit is located between the first light-transmitting unit and the first color resist block. 10.The display substrate of claim 1, wherein, The orthographic projection of the light-emitting unit on the display substrate is located inside the orthographic projection of the color resist block on the display substrate. 11.The display substrate of claim 2, wherein, The display substrate further includes an insulating layer and a black matrix layer. The black matrix layer is located on the side of the light-emitting unit away from the substrate. The insulating layer is disposed on the side of the black matrix layer away from the substrate. The optical adhesive layer is disposed between the filter layer and the insulating layer.

12. A display device, characterized by comprising: Includes the display substrate as described in any one of claims 1-11.

13. A method for preparing a display substrate, characterized in that, Applied to the fabrication of a display substrate as described in any one of claims 1-11, wherein the display substrate comprises a substrate; The preparation method includes: Multiple light-emitting units are formed on one side of the substrate. A filter layer is formed on the side of the light-emitting unit away from the substrate; wherein the filter layer includes a plurality of color resist blocks spaced apart, and the plurality of color resist blocks correspond one-to-one with the plurality of light-emitting units; A first light-adjusting element and a second light-adjusting element are formed between adjacent color blocks; A groove is formed between the first light adjustment element and the second light adjustment element; A light-transmitting layer is formed within the groove; wherein the refractive index of the light-transmitting layer is greater than the refractive index of the first light-adjusting element and the second light-adjusting element; A glass cover is formed on the side of the filter layer away from the substrate.

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