Display substrate, preparation method thereof and display device

Abstract

The application provides a display substrate, a preparation method thereof and a display device. The display substrate comprises a substrate, a light-emitting element layer on the substrate, at least two color film layers on a side of the light-emitting element layer away from the substrate, and at least one flat layer between adjacent color film layers. The at least two color film layers comprise light-blocking structures between adjacent color resistance layers, which block light between adjacent color resistance layers, thereby improving the cross-color problem between pixels. In addition, the structure of dividing a thicker color film layer into at least two layers can thin the thickness of each color film layer, and the morphology of the color film layer can be improved after the thickness of each color film layer is thinned, thereby improving the cross-color problem between pixels. The flat layer can fill the gap between adjacent color film layers, thereby ensuring the flatness of the subsequent film layer production and being beneficial to the structural stability of the 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] Microdisplay devices refer to small-sized displays that can be used in augmented reality (AR) and virtual reality (VR) devices, and represent the most important development direction for next-generation display technology. Microdisplay devices mainly include micro light-emitting diodes (Micro LEDs) and micro organic light-emitting diodes (Micro OLEDs). Summary of the Invention

[0003] 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.

[0004] To achieve the above objectives, in a first aspect, this application provides a display substrate, comprising:

[0005] Substrate;

[0006] The light-emitting element layer, located on the substrate, includes multiple light-emitting units arranged in an array;

[0007] At least two color filter layers are located on the side of the light-emitting element layer away from the substrate. The at least two color filter layers include multiple color resist layers and multiple light-shielding structures. The multiple color resist layers correspond one-to-one with the multiple light-emitting units. The colors of adjacent color resist layers are different. The light-shielding structures are located between adjacent color resist layers.

[0008] At least one planarization layer is located between adjacent color filter layers.

[0009] In a second aspect, this application provides a display device including a display substrate as described in the first aspect.

[0010] A third aspect of this application provides a method for fabricating a display substrate, the display substrate comprising a substrate, the fabrication method comprising:

[0011] A light-emitting element layer is formed on the substrate, the light-emitting element layer comprising a plurality of light-emitting units arranged in an array;

[0012] At least two color filter layers are formed on the side of the light-emitting element layer away from the substrate. The at least two color filter layers include multiple color resist layers and multiple light-shielding structures. The multiple color resist layers correspond one-to-one with the multiple light-emitting units. The colors of adjacent color resist layers are different. The light-shielding structures are located between adjacent color resist layers.

[0013] A planarization layer is formed between adjacent color filter layers.

[0014] As described above, this application provides a display substrate, its fabrication method, and a display device. The display substrate includes a substrate, a light-emitting element layer on the substrate, at least two color filter layers located on the side of the light-emitting element layer away from the substrate, and at least one planarization layer located between adjacent color filter layers. The at least two color filter layers include a light-shielding structure located between adjacent color resist layers. This light-shielding structure blocks light between adjacent color resist layers, thereby improving the crosstalk problem between pixels. Furthermore, dividing a relatively thick color filter layer into at least two layers reduces the thickness of each color filter layer. Reducing the thickness of each color filter layer improves its morphology, further mitigating the crosstalk problem between pixels. The planarization layer fills the gaps between adjacent color filter layers, ensuring the flatness of subsequent film layer fabrication and contributing to the structural stability of the display substrate. Attached Figure Description

[0015] 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.

[0016] Figure 1A A schematic diagram of an exemplary display substrate according to an embodiment of this application is shown.

[0017] Figure 1B A schematic diagram of an exemplary display substrate according to an embodiment of this application is shown.

[0018] Figure 1C A schematic diagram of the morphology of an exemplary color resist layer according to an embodiment of this application is shown.

[0019] Figure 2A A schematic diagram of an exemplary display substrate according to an embodiment of this application is shown.

[0020] Figure 2B A schematic diagram illustrating the fabrication process of an exemplary display substrate according to an embodiment of this application is shown.

[0021] Figure 2CA schematic diagram of the manufacturing process of another exemplary display substrate according to an embodiment of this application is shown.

[0022] Figure 2D A schematic diagram illustrating the fabrication process of another exemplary display substrate according to an embodiment of this application is shown.

[0023] Figure 2E A schematic diagram of yet another exemplary display substrate according to an embodiment of this application is shown.

[0024] Figure 2F A schematic diagram of another exemplary display substrate according to an embodiment of this application is shown.

[0025] Figure 3 A schematic diagram of an exemplary display device according to an embodiment of this application is shown.

[0026] Figure 4 A schematic flowchart of an exemplary display substrate fabrication method according to an embodiment of this application is shown. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] Figure 1A A schematic diagram of an exemplary display substrate 100 according to an embodiment of this application is shown.

[0030] like Figure 1AAs shown, the display substrate 100 may include a substrate 102, a light-emitting element layer 104, a cathode 106, an encapsulation layer 108, and a color filter layer 110. The light-emitting element layer (EL) 104 may be located on the substrate 102 and may include a plurality of light-emitting units 1042 arranged in an array. The cathode 106 may be located on the side of the light-emitting element layer 104 away from the substrate 102, and the encapsulation layer 108 may be located on the side of the cathode 106 away from the substrate 102. The color filter layer 110 may be located on the side of the encapsulation layer 108 away from the substrate 102. The substrate 102 may be made of a wafer.

[0031] The color filter layer 110 may include multiple color resist layers, such as color resist layer 1102, color resist layer 1104, and color resist layer 1106. Each color resist layer corresponds to a multiple light-emitting unit 1042, and adjacent color resist layers have different colors. For example, color resist layer 1102 may be blue, color resist layer 1104 may be green, and color resist layer 1106 may be red.

[0032] The display substrate 100 can be a micro organic light-emitting diode (Micro OLED), also known as a silicon-based OLED. Micro OLEDs typically use monocrystalline silicon integrated circuits as the backplane and top-emitting OLED devices as the light source. They offer advantages such as small size, light weight, high contrast, fast response speed, and low power consumption, and are expected to become one of the next-generation display terminals. Typically, the pixel unit of a silicon-based OLED display substrate includes a light-emitting element and a color filter (CF). The light-emitting element acts as the light source, emitting light under current drive, while the color filter mainly adjusts the emitted color and intensity of the pixel unit. Silicon-based OLEDs achieve full-color display through light-emitting elements and color filters.

[0033] The pixel units in silicon-based OLED display substrates are extremely small, with pixel diameters (d) typically between 3 and 8 micrometers. At this pixel specification, such as... Figure 1A As shown, the generating element layer 104 can emit light at different angles. After passing through the cathode 106 and the encapsulation layer 108, the light is refracted. When some light passes between adjacent color resist layers (for example, between the first color resist layer 1102 and the second color resist layer 1104), color crosstalk can easily occur between adjacent pixels because the colors of the adjacent color resist layers are different, which in turn leads to poor display of the display product.

[0034] Figure 1B A schematic diagram of an exemplary display substrate 150 according to an embodiment of this application is shown.

[0035] To prevent color crosstalk between pixels, a light-blocking black matrix layer (BM) is typically used to block light between adjacent color resist layers, thereby preventing crosstalk between pixels. For example... Figure 1B As shown, the display substrate 150 may include a color filter layer 152. In addition to color resist layers 1102, 1104, and 1106, the color filter layer 152 may also include a black matrix layer 1522. In this way, light between adjacent color resist layers (e.g., light between color resist layers 1102 and 1104) can be blocked by the black matrix layer 1522, improving the color crosstalk problem between adjacent color resist layers.

[0036] Figure 1C A schematic diagram of the morphology of an exemplary color resist layer according to an embodiment of this application is shown.

[0037] Besides color bleeding issues, the color resist layer of color filter layer 110 has low resolution. When multiple color resist layers are formed through a single patterning process (e.g., photolithography), the multiple color resist layers often exhibit poor morphology, with significant differences in morphology between the top and bottom (e.g., undercut structure). Figure 1C As shown, due to the poor resolution of the material used to fabricate the color resist layer, light cannot easily reach the bottom of the color resist layer 154 during photolithography, making it difficult to pattern the bottom of the color resist layer 154. Consequently, an undercut structure 156 is formed at the bottom of the color resist layer 154. This undercut structure 156 creates a concave structure at the bottom of the color resist layer 154. As a result, adjacent color resist layers of different colors overlap at the location of the undercut structure 156. When light passes through this overlapping area, color bleeding occurs. Furthermore, the morphology of the color filter layer deteriorates with increasing thickness.

[0038] To address at least the aforementioned problems, this application provides a display substrate, a method for fabricating the same, and a display device. The display substrate includes a substrate, a light-emitting element layer on the substrate, at least two color filter layers located on the side of the light-emitting element layer away from the substrate, and at least one planarization layer located between adjacent color filter layers. The at least two color filter layers include a light-shielding structure located between adjacent color resist layers. This light-shielding structure blocks light between adjacent color resist layers, thereby improving the cross-color problem between pixels. Furthermore, dividing a relatively thick color filter layer into at least two layers reduces the thickness of each color filter layer. Reducing the thickness of each color filter layer improves its morphology, further mitigating the cross-color problem between pixels. The planarization layer fills the gaps between adjacent color filter layers, ensuring the flatness of subsequent film layer fabrication and contributing to the structural stability of the display substrate.

[0039] Figure 2A A schematic diagram of an exemplary display substrate 200 according to an embodiment of this application is shown.

[0040] like Figure 2A As shown, the display substrate 200 may include a substrate 202, a light-emitting element layer 204 located on the substrate 202, and at least two color filter layers 210 located on the side of the light-emitting element layer 204 away from the substrate 202. The light-emitting element layer 204 may further include a plurality of light-emitting units 2042 arranged in an array. The display substrate 200 may also include a cathode 206 and an encapsulation layer 208 sequentially stacked between the light-emitting element layer 204 and the at least two color filter layers 210.

[0041] like Figure 2A As shown, in some embodiments, at least two color filter layers 210 may further include multiple color resist layers (e.g., color resist layers 2102, 2104, 2106, and 2108) and multiple light-shielding structures (e.g., light-shielding structures 2112, 2114, and 2116). Each color resist layer corresponds one-to-one with a multiple light-emitting unit 2042. Adjacent color resist layers have different colors; for example, color resist layer 2102 may be red, color resist layer 2104 may be green, color resist layer 2106 may be blue, and color resist layer 2108 may be red. The light-shielding structures may be located between adjacent color resist layers. For example, light-shielding structure 2112 may be located between color resist layers 2102 and 2104, light-shielding structure 2114 may be located between color resist layers 2104 and 2106, and light-shielding structure 2116 may be located between color resist layers 2106 and 2108. In this way, the light-blocking structure located between adjacent color resist layers can block light between adjacent color resist layers, improving the color crosstalk problem between adjacent pixels. In addition, by dividing the thicker color filter layer into a structure of at least two layers, the problem of poor color filter layer morphology caused by the low resolution of the thicker color filter layer can be improved.

[0042] In some embodiments, the display substrate 200 may further include at least one planarization layer 212, which may be located between adjacent color filter layers. For example, planarization layer 2122 may be located between color filter layer 220 and color filter layer 222, and planarization layer 2124 may be located between color filter layer 222 and color filter layer 226, to fill the step difference between adjacent color filter layers, thereby ensuring the flatness of subsequent film layer fabrication and contributing to the structural stability of the display substrate. In some embodiments, planarization layer 212 includes a transparent material. For example, planarization layer 212 may be an overcoating (OC) layer, so as not to affect the light transmittance in at least two color filter layers.

[0043] The thickness of the color filter layer is typically 1-3 micrometers. When a thicker color filter layer is divided into at least two color filter layers 210, in some embodiments, the thickness of each color filter layer can be less than or equal to 0.8 micrometers. In other embodiments, the thicker color filter layer can be divided into two, three, or multiple layers; this application does not limit this. As mentioned above, the resolution of the material used to fabricate the color resist layer is poor, and an undercut structure forms at the bottom of the color resist layer. As the thickness of the color filter layer increases, the morphology of the color filter layer tends to deteriorate. By reducing the thickness of each color filter layer using the method of this application embodiment, the problem that light cannot easily reach the bottom of the color resist layer, thus making it difficult to pattern the bottom of the color resist layer, is improved. In each color filter layer, an undercut structure is less likely to form between adjacent color resist layers, thereby improving the color crosstalk problem between adjacent pixels caused by the undercut structure.

[0044] like Figure 2A As shown, in some embodiments, the light-shielding structure may further include at least two light-shielding portions arranged sequentially along a direction away from the substrate 202, with adjacent light-shielding portions having different colors. For example, light-shielding structure 2112 may include light-shielding portions 21124, 21122, and 21126 arranged sequentially along a direction away from the substrate 202. Light-shielding portion 21124 may be red, light-shielding portion 21122 may be blue, and light-shielding portion 21126 may be green. Light-shielding structure 2114 may include light-shielding portions 21142, 21144, and 21146 arranged sequentially along a direction away from the substrate 202. Light-shielding portion 21142 may be blue, light-shielding portion 21144 may be red, and light-shielding portion 21146 may be green. Light-shielding structure 2116 may include light-shielding portions 21162, 21164, and 21166 arranged sequentially along a direction away from the substrate 202. Among them, the light-blocking part 21162 can be blue, the light-blocking part 21164 can be green, and the light-blocking part 21166 can be red.

[0045] The light-blocking structure formed by overlapping light-blocking parts of different colors can block the transmission of light between adjacent color resist layers, thereby improving the problem of color crosstalk between adjacent pixels.

[0046] As an alternative embodiment, at least two light-blocking portions can be black matrix layers, which can also block the transmission of light between adjacent color resist layers, thereby improving the problem of color crosstalk between adjacent pixels.

[0047] In some embodiments, at least two light-shielding parts may include at least two colors selected from red, green, and blue. The embodiments of this application do not limit the order in which the colors of the at least two light-shielding parts are set.

[0048] Figure 2B A schematic diagram illustrating the fabrication process of an exemplary display substrate 200 according to an embodiment of this application is shown.

[0049] like Figure 2B As shown, in some embodiments, at least two color filter layers 210 may include a first color filter layer 220, multiple color resist layers may include a first color resist layer 2106, the first color resist layer 2106 may include a first portion 21062, multiple light-shielding structures may include a first light-shielding structure 2114 and a second light-shielding structure 2116, the first light-shielding structure 2114 may include a first light-shielding portion 21142, the second light-shielding structure 2116 may include a second light-shielding portion 21162, and the first color filter layer 220 may include the first portion 21062, the first light-shielding portion 21142, and the second light-shielding portion 21162. The first portion 21062 may be located between the first light-shielding portion 21142 and the second light-shielding portion 21162, and the colors of the first portion 21062, the first light-shielding portion 21142, and the second light-shielding portion 21162 are the same. For example, the colors of the first portion 21062, the first light-shielding portion 21142, and the second light-shielding portion 21162 may be blue. In this way, when the color resist material is coated on the encapsulation layer 208 and the first color film layer 220 is made through a single patterning process, the first part 21062, the first light-shielding part 21142 and the second light-shielding part 21162 can be integrally formed, which can save manufacturing process steps.

[0050] After the first color filter layer 220 is made, as follows Figure 2B As shown, in some embodiments, a planarization layer 2122 can be formed on the side of the first color filter layer 220 away from the substrate 202 to fill the first color filter layer 220, thereby ensuring the flatness of subsequent film layer fabrication and contributing to the structural stability of the display substrate.

[0051] like Figure 2B As shown, in some embodiments, at least two color filter layers 210 may further include a second color filter layer 222, the first color resist layer 2106 may further include a second portion 21064, and the plurality of light-shielding structures may include a third light-shielding structure 2112, the third light-shielding structure 2112 may further include a seventh light-shielding portion 21122, and the second color filter layer 222 may include the second portion 21064 and the seventh light-shielding portion 21122. After the planarization layer 2122 is fabricated, the second color filter layer 222 may be formed on the side of the planarization layer 2122 away from the substrate 202. In some embodiments, when fabricating the second color filter layer 222, a first color resist material may be coated on the side of the first color filter layer 220 away from the substrate 202, and the second portion 21064 and the seventh light-shielding portion 21122 may be formed through a single patterning process to form the second color filter layer 222. Since the second part 21064 and the seventh light-shielding part 21122 are the same color, forming the second part 21064 and the seventh light-shielding part 21122 at the same time can save manufacturing process steps.

[0052] Figure 2C A schematic diagram illustrating the manufacturing process of another exemplary display substrate 200 according to an embodiment of this application is shown.

[0053] like Figure 2C As shown, in some embodiments, the first light-shielding structure 2114 may further include a third light-shielding portion 21144. Multiple color resist layers may further include a second color resist layer 2102 and a third color resist layer 2108. The second color resist layer may include a fourth portion 21022, and the third color resist layer may include a fifth portion 21082. The second color filter layer 222 may include the third light-shielding portion 21144, the fourth portion 21022, and the fifth portion 21082. Since the third light-shielding portion 21144, the fourth portion 21022, and the fifth portion 21082 have the same color, in some embodiments, after the second portion 21064 and the seventh light-shielding portion 21122 are fabricated, the second color resist material can be coated on the side of the first color filter layer 220 away from the substrate 202, thus forming the third light-shielding portion 21144, the fourth portion 21022, and the fifth portion 21082 simultaneously in a single patterning process, thereby saving fabrication steps.

[0054] Figure 2D A schematic diagram illustrating the fabrication process of another exemplary display substrate 200 according to an embodiment of this application is shown.

[0055] like Figure 2D As shown, in some embodiments, the plurality of color resist layers may further include a fourth color resist layer 2104, which may include a sixth portion 21042. The second light-shielding structure 2116 may further include a fourth light-shielding portion 21164. The second color filter layer 222 may include the sixth portion 21042 and the fourth light-shielding portion 21164. Since the sixth portion 21042 and the fourth light-shielding portion 21164 have the same color, in some embodiments, after the third light-shielding portion 21144, the fourth portion 21022, and the fifth portion 21082 are fabricated, the third color resist material can be coated on the side of the first color filter layer 220 away from the substrate 202, and the sixth portion 21042 and the fourth light-shielding portion 21164 can be formed simultaneously in a single patterning process, thereby saving fabrication steps.

[0056] Figure 2E A schematic diagram of yet another exemplary display substrate 200 according to an embodiment of this application is shown.

[0057] like Figure 2EAs shown, in some embodiments, at least two color filter layers 210 may further include a third color filter layer 226. After the second color filter layer 222 is fabricated, in some embodiments, a planarization layer 2124 may be formed on the side of the second color filter layer 222 away from the substrate 202 to fill the second color filter layer 222. Further, in some embodiments, a third color filter layer 226 may be formed on the side of the planarization layer 2124 away from the substrate 202. It is understood that the above embodiments are described using the fabrication process of the second color filter layer 222 as an example. The fabrication processes of other layers in the at least two color filter layers 210, such as the first color filter layer 220 and the third color filter layer 226, are the same as those of the second color filter layer 222 and have the same effect, and will not be described again here.

[0058] like Figure 2E As shown, in some embodiments, the second color filter layer 222 may include a second portion 21064, a third light-shielding portion 21144, and a fourth light-shielding portion 21164, with the second portion 21064 located between the third light-shielding portion 21144 and the fourth light-shielding portion 21164. The third light-shielding portion 21144 and the fourth light-shielding portion 21164 have different colors; the third light-shielding portion 21144 has a different color from the first light-shielding portion 21142 and the second light-shielding portion 21162; and the fourth light-shielding portion 21164 has a different color from the first light-shielding portion 21142 and the second light-shielding portion 21162.

[0059] like Figure 2E As shown, in some embodiments, the first color resist layer 2106 may further include a third portion 21066, the first light-shielding structure 2114 may further include a fifth light-shielding portion 21146, and the second light-shielding structure 2116 may further include a sixth light-shielding portion 21166. The third portion 21066 may be located between the fifth light-shielding portion 21146 and the sixth light-shielding portion 21166. The fifth light-shielding portion 21146 and the fourth light-shielding portion 21164 have the same color, and the sixth light-shielding portion 21166 and the third light-shielding portion 21144 have the same color.

[0060] Since the first part 21062, the second part 21064, and the third part 21066 are the same color, and the planarization layers 2122 and 2124 are made of transparent material, the light emitted by the light-emitting element layer 204 can pass through the first color resist layer 2106 and emit light of the same color as the first part 21062, the second part 21064, and the third part 21066. At the same time, through the multiple light-shielding parts of different colors that overlap in the first light-shielding structure 2114 and the second light-shielding structure 2116, the light on both sides of the first color resist layer 2106 is effectively blocked, thereby improving the problem of color bleeding between the first color resist layer 2106 and the adjacent color resist layers 2104 and 2108.

[0061] like Figure 2E As shown, in some embodiments, the light-emitting element layer 204 may further include a plurality of spacer regions 2044, which may be located between adjacent light-emitting units 2042. The orthogonal projection of the light-shielding structure on the substrate 202 may cover the orthogonal projection of the spacer regions 2044 on the substrate 202. For example, the width of the third light-shielding structure 2112 in the X direction may be greater than or equal to the width of the spacer regions 2044 in the X direction, so as to ensure that the third light-shielding structure 2112 can block the light irradiating between the color resist layer 2102 and the color resist layer 2104.

[0062] Figure 2F A schematic diagram of another exemplary display substrate 200 according to an embodiment of this application is shown.

[0063] like Figure 2F As shown, in some embodiments, the overlap between the orthographic projections of multiple light-shielding structures on the substrate 202 and the orthographic projections of multiple light-emitting units on the substrate 202 can increase in a direction away from the center of the display substrate 200. For example, the first light-shielding structure 2114 can be a light-shielding structure located at the center Y of the display substrate 200, and the width of the third light-shielding structure 2112 and the second light-shielding structure 2116 in the X direction can be greater than the width of the first light-shielding structure 2114 in the X direction. The wider third light-shielding structure 2112 and the second light-shielding structure 2116 can block light emitted from the light-emitting unit 2042 at a larger angle, thereby improving the color shift problem that occurs when users view the display panel at a wide viewing angle.

[0064] It should be noted that color filters of different colors and thicknesses have different transmittance. Therefore, in practical applications, different colors and sequences of at least two light-shielding sections with different film thicknesses and light-shielding structures can be combined according to different product requirements. This application does not limit this. Furthermore, the thickness of each color filter layer in the at least two film layers can be the same or different, and the width of multiple light-shielding structures can also be adjusted to precisely control the viewing angle and improve color shift at large viewing angles.

[0065] This application also provides a display device. Figure 3 A schematic diagram of an exemplary display device according to an embodiment of this application is shown.

[0066] like Figure 3As shown, this embodiment provides a display device 301, including a display substrate 3011. The display substrate 3011 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 4 A schematic flowchart of an exemplary display substrate fabrication method 400 according to an embodiment of this application is shown. The display substrate may include a substrate, such as... Figure 4 As shown, the preparation method 400 may include the following steps.

[0068] In step 402, a light-emitting element layer is formed on the substrate, the light-emitting element layer comprising a plurality of light-emitting units arranged in an array.

[0069] In step 404, at least two color filter layers are formed on the side of the light-emitting element layer away from the substrate. The at least two color filter layers include multiple color resist layers and multiple light-shielding structures. The multiple color resist layers correspond one-to-one with the multiple light-emitting units. The colors of adjacent color resist layers are different, and the light-shielding structures are located between adjacent color resist layers.

[0070] In step 406, a planarization layer is formed between adjacent color filter layers.

[0071] In some embodiments, the light-shielding structure includes at least two light-shielding portions arranged sequentially along a direction away from the substrate, wherein adjacent light-shielding portions are of different colors.

[0072] In some embodiments, the at least two color filter layers include a first color filter layer, the plurality of color resist layers include a first color resist layer, the first color resist layer includes a first portion, the plurality of light-shielding structures include a first light-shielding structure and a second light-shielding structure, the first light-shielding structure includes a first light-shielding portion, the second light-shielding structure includes a second light-shielding portion, the first color filter layer includes the first portion, the first light-shielding portion and the second light-shielding portion, the first portion is located between the first light-shielding portion and the second light-shielding portion, and the color of the first portion, the color of the first light-shielding portion and the color of the second light-shielding portion are the same; the preparation method further includes:

[0073] The first part, the first light-shielding part, and the second light-shielding part are formed by a single patterning process, wherein the first part, the first light-shielding part, and the second light-shielding part are integrally formed.

[0074] In some embodiments, the at least two color filter layers include a second color filter layer, the first color resist layer further includes a second portion, the first light-shielding structure includes a third light-shielding portion, the second light-shielding structure further includes a fourth light-shielding portion, the second color filter layer includes the second portion, the third light-shielding portion, and the fourth light-shielding portion, the second portion being located between the third light-shielding portion and the fourth light-shielding portion; the preparation method further includes:

[0075] The second part, the third light-shielding part, and the fourth light-shielding part are formed through a single patterning process. The third light-shielding part and the fourth light-shielding part are different colors. The third light-shielding part is different from the first light-shielding part and the second light-shielding part. The fourth light-shielding part is different from the first light-shielding part and the second light-shielding part.

[0076] In some embodiments, the at least two color filter layers further include a third color filter layer, the first color resist layer further includes a third portion, the first light-shielding structure further includes a fifth light-shielding portion, the second light-shielding structure further includes a sixth light-shielding portion, the third portion is located between the fifth light-shielding portion and the sixth light-shielding portion, and the third color filter layer includes the third portion, the fifth light-shielding portion, and the sixth light-shielding portion; the preparation method further includes:

[0077] The third part, the fifth light-shielding part, and the sixth light-shielding part are formed through a single patterning process, wherein the fifth light-shielding part and the fourth light-shielding part have the same color, and the sixth light-shielding part and the third light-shielding part have the same color.

[0078] In some embodiments, the light-emitting element layer includes a plurality of spacer regions located between adjacent light-emitting units, and the orthographic projection of the light-shielding structure on the substrate covers the orthographic projection of the spacer regions on the substrate.

[0079] In some embodiments, the range of overlap between the orthographic projections of the plurality of light-shielding structures on the substrate and the orthographic projections of the plurality of light-emitting units on the substrate increases in a direction away from the center of the display substrate.

[0080] In some embodiments, the at least two light-shielding portions include at least two colors selected from red, green, and blue; or

[0081] The at least two light-shielding parts are black matrix layers.

[0082] In some embodiments, the planarization layer comprises a transparent material; and / or

[0083] The thickness of each of the at least two color filter layers is less than or equal to 0.8 micrometers.

[0084] This application provides a display substrate, a method for fabricating the same, and a display device. The display substrate includes a substrate, a light-emitting element layer on the substrate, at least two color filter layers located on the side of the light-emitting element layer away from the substrate, and at least one planarization layer located between adjacent color filter layers. The at least two color filter layers include a light-shielding structure located between adjacent color resist layers. This light-shielding structure blocks light between adjacent color resist layers, thereby improving the cross-color problem between pixels. Furthermore, dividing a relatively thick color filter layer into at least two layers reduces the thickness of each color filter layer. Reducing the thickness of each color filter layer improves its morphology, further mitigating the cross-color problem between pixels. The planarization layer fills the gaps between adjacent color filter layers, ensuring the flatness of subsequent film layer fabrication and contributing to the structural stability of the display substrate.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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, comprising: Substrate; The light-emitting element layer, located on the substrate, includes multiple light-emitting units arranged in an array; At least two color filter layers are located on the side of the light-emitting element layer away from the substrate. The at least two color filter layers include multiple color resist layers and multiple light-shielding structures. The multiple color resist layers correspond one-to-one with the multiple light-emitting units. The colors of adjacent color resist layers are different. The light-shielding structures are located between adjacent color resist layers. At least one planarization layer is located between adjacent color filter layers.

2. The display substrate as claimed in claim 1, wherein, The light-shielding structure includes at least two light-shielding portions arranged sequentially along a direction away from the substrate, and adjacent light-shielding portions are of different colors.

3. The display substrate as described in claim 1, wherein, The at least two color filter layers include a first color filter layer; the plurality of color resist layers include a first color resist layer, the first color resist layer includes a first portion; the plurality of light-shielding structures include a first light-shielding structure and a second light-shielding structure, the first light-shielding structure includes a first light-shielding part, the second light-shielding structure includes a second light-shielding part, the first color filter layer includes the first portion, the first light-shielding part and the second light-shielding part, the first portion is located between the first light-shielding part and the second light-shielding part, and the color of the first portion, the color of the first light-shielding part and the color of the second light-shielding part are the same; The first part, the first light-shielding part, and the second light-shielding part are integrally formed.

4. The display substrate as described in claim 3, wherein, The at least two color filter layers further include a second color filter layer, the first color resist layer further includes a second portion, the first light-shielding structure further includes a third light-shielding portion, the second light-shielding structure further includes a fourth light-shielding portion, the second color filter layer includes the second portion, the third light-shielding portion and the fourth light-shielding portion, and the second portion is located between the third light-shielding portion and the fourth light-shielding portion; The third light-shielding part and the fourth light-shielding part are different colors. The third light-shielding part is different from the first light-shielding part and the second light-shielding part. The fourth light-shielding part is different from the first light-shielding part and the second light-shielding part.

5. The display substrate as claimed in claim 4, wherein, The at least two color filter layers further include a third color filter layer, the first color resist layer further includes a third portion, the first light-shielding structure further includes a fifth light-shielding portion, the second light-shielding structure further includes a sixth light-shielding portion, the third portion is located between the fifth light-shielding portion and the sixth light-shielding portion, and the third color filter layer includes the third portion, the fifth light-shielding portion and the sixth light-shielding portion; The fifth light-shielding part is the same color as the fourth light-shielding part, and the sixth light-shielding part is the same color as the third light-shielding part.

6. The display substrate as claimed in claim 1, wherein, The light-emitting element layer includes multiple spacing regions located between adjacent light-emitting units, and the orthographic projection of the light-shielding structure on the substrate covers the orthographic projection of the spacing regions on the substrate.

7. The display substrate as claimed in claim 1, wherein, The extent of overlap between the orthographic projections of the plurality of light-shielding structures on the substrate and the orthographic projections of the plurality of light-emitting units on the substrate increases in a direction away from the center of the display substrate.

8. The display substrate as claimed in claim 2, wherein, The at least two light-shielding parts include at least two colors selected from red, green, and blue; or The at least two light-shielding parts are black matrix layers.

9. The display substrate as claimed in claim 1, wherein, The planarization layer includes a transparent material; and / or The thickness of each of the at least two color filter layers is less than or equal to 0.8 micrometers.

10. A display device comprising a display substrate as described in any one of claims 1-9.

11. A method for fabricating a display substrate, the display substrate comprising a substrate, the fabrication method comprising: A light-emitting element layer is formed on the substrate, the light-emitting element layer comprising a plurality of light-emitting units arranged in an array; At least two color filter layers are formed on the side of the light-emitting element layer away from the substrate. The at least two color filter layers include multiple color resist layers and multiple light-shielding structures. The multiple color resist layers correspond one-to-one with the multiple light-emitting units. The colors of adjacent color resist layers are different. The light-shielding structures are located between adjacent color resist layers. A planarization layer is formed between adjacent color filter layers.

12. The preparation method according to claim 11, wherein, The at least two color filter layers include a first color filter layer; the plurality of color resist layers include a first color resist layer, the first color resist layer including a first portion; the plurality of light-shielding structures include a first light-shielding structure and a second light-shielding structure, the first light-shielding structure including a first light-shielding portion, the second light-shielding structure including a second light-shielding portion; the first color filter layer includes the first portion, the first light-shielding portion, and the second light-shielding portion, the first portion being located between the first light-shielding portion and the second light-shielding portion, and the color of the first portion, the color of the first light-shielding portion, and the color of the second light-shielding portion being the same; the preparation method further includes: The first part, the first light-shielding part, and the second light-shielding part are formed by a single patterning process, wherein the first part, the first light-shielding part, and the second light-shielding part are integrally formed.

13. The preparation method according to claim 12, wherein, The at least two color filter layers include a second color filter layer, the first color resist layer further includes a second portion, the first light-shielding structure includes a third light-shielding portion, the second light-shielding structure further includes a fourth light-shielding portion, the second color filter layer includes the second portion, the third light-shielding portion, and the fourth light-shielding portion, the second portion being located between the third light-shielding portion and the fourth light-shielding portion; the preparation method further includes: The second part, the third light-shielding part, and the fourth light-shielding part are formed through a single patterning process. The third light-shielding part and the fourth light-shielding part are different colors. The third light-shielding part is different from the first light-shielding part and the second light-shielding part. The fourth light-shielding part is different from the first light-shielding part and the second light-shielding part.

14. The preparation method according to claim 13, wherein, The at least two color filter layers further include a third color filter layer, the first color resist layer further includes a third portion, the first light-shielding structure further includes a fifth light-shielding portion, the second light-shielding structure further includes a sixth light-shielding portion, the third portion is located between the fifth light-shielding portion and the sixth light-shielding portion, and the third color filter layer includes the third portion, the fifth light-shielding portion and the sixth light-shielding portion; The preparation method further includes: The third part, the fifth light-shielding part, and the sixth light-shielding part are formed through a single patterning process, wherein the fifth light-shielding part and the fourth light-shielding part have the same color, and the sixth light-shielding part and the third light-shielding part have the same color.

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