Display substrate and display device

Abstract

A display substrate and a display device, the display substrate comprising an array substrate and a color film layer; the array substrate comprising a substrate and a plurality of sub-pixels, the plurality of sub-pixels comprising adjacent first and second sub-pixels, the first sub-pixel comprising a first light emitting device, and the second sub-pixel comprising a second light emitting device; the color film layer comprising a light shielding pattern and a plurality of color film patterns, the light shielding pattern comprising a first sub-opening, a second sub-opening and a first light shielding portion, the first sub-opening exposing the first light emitting device, the second sub-opening exposing the second light emitting device, and the plurality of color film patterns comprising a first color film pattern and a second color film pattern, the first color film pattern being disposed at least in the first sub-opening, and the second color film pattern being disposed at least in the second sub-opening; the color film layer comprising a first color film sub-layer and a second color film sub-layer, the first color film sub-layer and the second color film sub-layer overlapping to form the first light shielding portion, and in the first light shielding portion, a thickness of the first color film sub-layer being less than a thickness of the second color film sub-layer.

Description

Technical Field

[0001] Embodiments of this disclosure relate to a display substrate and a display device. Background Technology

[0002] OLED (Organic Light Emitting Diode) display devices have a series of advantages such as self-illumination, high contrast, high definition, wide viewing angle, low power consumption, fast response speed, and low manufacturing cost. As a result, they have become one of the key development directions for next-generation display devices and have therefore received increasing attention. Utility Model Content

[0003] At least one embodiment of this disclosure provides a display substrate, which includes an array substrate and a color filter layer. The array substrate includes a substrate and a plurality of sub-pixels disposed on the substrate, wherein the plurality of sub-pixels includes adjacent first sub-pixels and second sub-pixels, the first sub-pixels including a first light-emitting device, and the second sub-pixels including a second light-emitting device. The color filter layer includes a light-shielding pattern and a plurality of color filter patterns. The light-shielding pattern includes a first sub-opening, a second sub-opening, and a first light-shielding portion located between the first sub-opening and the second sub-opening. In a direction perpendicular to the substrate, the first sub-opening exposes the first light-emitting device, the second sub-opening exposes the second light-emitting device, and the plurality of color filter patterns... The design includes a first color filter pattern and a second color filter pattern. The first color filter pattern is at least disposed in the first sub-opening and configured to transmit light emitted by the first light-emitting device. The second color filter pattern is at least disposed in the second sub-opening and configured to transmit light emitted by the second light-emitting device. The color filter layer includes a first color filter sub-layer and a second color filter sub-layer disposed on the side of the first color filter sub-layer away from the substrate. The first color filter sub-layer includes the first color filter pattern, and the second color filter sub-layer includes the second color filter pattern. The first color filter sub-layer and the second color filter sub-layer overlap to form the first light-shielding portion. In the first light-shielding portion, the thickness of the first color filter sub-layer is less than the thickness of the second color filter sub-layer.

[0004] For example, in a display substrate provided in at least one embodiment of this disclosure, the plurality of sub-pixels further includes a third sub-pixel, the third sub-pixel includes a third light-emitting device, the light-shielding pattern further includes a third sub-opening, the third sub-opening exposes the third light-emitting device in a direction perpendicular to the substrate, the plurality of color filter patterns further includes a third color filter pattern, the third color filter pattern is at least disposed in the third sub-opening and configured to transmit light emitted by the third light-emitting device, the color filter layer further includes a third color filter sub-layer disposed between the first color filter sub-layer and the second color filter sub-layer, the third color filter sub-layer includes the third color filter pattern, the first color filter sub-layer, the second color filter sub-layer and the third color filter sub-layer overlap to form the first light-shielding portion, in the first light-shielding portion, the thickness of the first color filter sub-layer is less than the thickness of the third color filter sub-layer.

[0005] For example, in a display substrate provided in at least one embodiment of this disclosure, the thickness of the first color filter pattern is equal to the thickness of the first color filter sublayer in the first light-shielding portion.

[0006] For example, in at least one embodiment of the display substrate provided in this disclosure, the thickness of the first color filter pattern is greater than the thickness of the first color filter sublayer in the first light-shielding portion.

[0007] For example, in a display substrate provided in at least one embodiment of this disclosure, the plurality of sub-pixels further includes a third sub-pixel, the third sub-pixel includes a third light-emitting device, the light-shielding pattern further includes a third sub-opening, the third sub-opening exposes the third light-emitting device in a direction perpendicular to the substrate, the plurality of color filter patterns further includes a third color filter pattern, the third color filter pattern is at least disposed in the third sub-opening and configured to transmit light emitted by the third light-emitting device, the color filter layer further includes a third color filter sub-layer disposed between the first color filter sub-layer and the second color filter sub-layer, the third color filter sub-layer includes the third color filter pattern, the first color filter sub-layer, the second color filter sub-layer and the third color filter sub-layer overlap to form the first light-shielding portion, in the first light-shielding portion, the thickness of the third color filter sub-layer is less than the thickness of the second color filter sub-layer.

[0008] For example, in a display substrate provided in at least one embodiment of this disclosure, the plurality of sub-pixels further includes a third sub-pixel, the third sub-pixel includes a third light-emitting device, the light-shielding pattern further includes a third sub-opening, the third sub-opening exposes the third light-emitting device in a direction perpendicular to the substrate, the plurality of color filter patterns further includes a third color filter pattern, the third color filter pattern is at least disposed in the third sub-opening and configured to transmit light emitted by the third light-emitting device, the color filter layer further includes a third color filter sub-layer disposed between the first color filter sub-layer and the second color filter sub-layer, the third color filter sub-layer includes the third color filter pattern, the first color filter sub-layer, the second color filter sub-layer and the third color filter sub-layer overlap to form the first light-shielding portion, and the thickness of the first color filter pattern is greater than or equal to the sum of the thicknesses of the first color filter sub-layer and the third color filter sub-layer in the first light-shielding portion.

[0009] For example, in the display substrate provided in at least one embodiment of this disclosure, the thickness of the first color filter sublayer in the first light-shielding portion is 0.4μm-1.1μm.

[0010] At least one embodiment of this disclosure also provides a display substrate, the display substrate including an array substrate and a color filter layer; the array substrate includes a substrate and a plurality of sub-pixels disposed on the substrate, wherein the plurality of sub-pixels includes adjacent first sub-pixels and second sub-pixels, the first sub-pixels including a first light-emitting device, and the second sub-pixels including a second light-emitting device; the color filter layer includes a light-shielding pattern and a plurality of color filter patterns, the light-shielding pattern including a first sub-opening, a second sub-opening, and a first light-shielding portion located between the first sub-opening and the second sub-opening, wherein, in a direction perpendicular to the substrate, the first sub-opening exposes the first light-emitting device, and the second sub-opening exposes the second light-emitting device; the plurality of color filter patterns include a first color filter pattern and a second color filter pattern, the first color filter pattern being at least disposed in the first sub-opening and configured to transmit light emitted by the first light-emitting device, the second color filter pattern being at least disposed in the second sub-opening and configured to transmit light emitted by the second light-emitting device, wherein the light-shielding pattern includes a black matrix, the cross-section of the first light-shielding portion includes a middle portion and a first edge portion and a second edge portion respectively located on both sides of the middle portion, and the average thickness of at least one of the first edge portion and the second edge portion is less than the average thickness of the middle portion.

[0011] For example, in a display substrate provided in at least one embodiment of this disclosure, the average thickness of the first edge portion is less than the average thickness of the middle portion, and the cross-sections of the first edge portion and the middle portion are generally stepped.

[0012] For example, in at least one embodiment of the display substrate provided in this disclosure, the average thickness of the first edge portion and the second edge portion is less than the average thickness of the middle portion, and the cross-section of the first light-shielding portion is generally convex.

[0013] For example, in at least one embodiment of the display substrate provided in this disclosure, the average thickness of the first edge portion and the second edge portion is less than the average thickness of the middle portion, and the cross-section of the first light-shielding portion is generally triangular or trapezoidal.

[0014] At least one embodiment of this disclosure also provides a display substrate, the display substrate including an array substrate and a color filter layer; the array substrate includes a substrate and a plurality of sub-pixels disposed on the substrate, wherein each of the plurality of sub-pixels includes a light-emitting device, the color filter layer includes a light-shielding pattern and a plurality of color filter patterns; the light-shielding pattern includes a plurality of first openings, wherein, in a direction perpendicular to the substrate, the plurality of first openings expose the light-emitting devices of the plurality of sub-pixels; the plurality of color filter patterns are respectively disposed at least in the plurality of first openings and configured to transmit light emitted by the light-emitting devices of the plurality of sub-pixels, wherein the roughness of at least a portion of the surface of the color filter layer away from the substrate is greater than the roughness of at least a portion of the surface of the color filter layer near the substrate.

[0015] For example, in a display substrate provided in at least one embodiment of this disclosure, at least a portion of the color filter layer includes at least a portion of the plurality of color filter patterns; and / or at least a portion of the color filter layer includes at least a portion of the light-shielding pattern.

[0016] For example, in a display substrate provided in at least one embodiment of this disclosure, the plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel. The first sub-pixel is configured to emit light of a first color, the second sub-pixel is configured to emit light of a second color, and the third sub-pixel is configured to emit light of a third color. The plurality of color filter patterns includes a first color filter pattern, a second color filter pattern, and a third color filter pattern. The first color filter pattern is configured to transmit light of the first color, the second color filter pattern is configured to transmit light of the second color, and the third color filter pattern is configured to transmit light of the third color. The surface roughness of at least one of the first color filter pattern, the second color filter pattern, and the third color filter pattern, away from the substrate, is greater than the surface roughness of the surface close to the substrate.

[0017] For example, in a display substrate provided in at least one embodiment of this disclosure, at least one of the first color filter pattern, the second color filter pattern, and the third color filter pattern includes an overlapping portion, the overlapping portion being located on the side of the light-shielding pattern away from the substrate, and the thickness of the overlapping portion being 0.1 μm-1.2 μm.

[0018] For example, in a display substrate provided in at least one embodiment of this disclosure, the color filter layer includes a first color filter sublayer and a second color filter sublayer disposed on the side of the first color filter sublayer away from the substrate. The first color filter sublayer includes a first color filter pattern, and the second color filter sublayer includes a second color filter pattern. The first color filter sublayer and the second color filter sublayer overlap to form the light-shielding pattern. The roughness of at least a portion of the surface of the first color filter sublayer away from the substrate is greater than the roughness of the surface near the substrate.

[0019] For example, in a display substrate provided in at least one embodiment of this disclosure, the roughness of at least a portion of the surface of the second color filter sublayer that is away from the substrate is greater than the roughness of the surface that is close to the substrate.

[0020] For example, in a display substrate provided in at least one embodiment of this disclosure, the light-shielding pattern includes a black matrix, the black matrix includes a first light-shielding portion located between two adjacent first openings in the plurality of first openings, the cross-section of the first light-shielding portion includes a middle portion and a first edge portion and a second edge portion located on both sides of the middle portion, and the average thickness of at least one of the first edge portion and the second edge portion is less than the average thickness of the middle portion.

[0021] For example, in the display substrate provided in at least one embodiment of this disclosure, the average thickness of the first edge portion and the second edge portion is less than the average thickness of the middle portion, and the cross-section of the first light-shielding portion is generally stepped; or the cross-section of the first light-shielding portion is generally triangular or trapezoidal.

[0022] At least one embodiment of this disclosure also provides a display device, which includes the display substrate provided in the embodiments of this disclosure. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0024] Figure 1A This is a partial cross-sectional schematic diagram of a display substrate provided in at least one embodiment of the present disclosure; Figure 1B This is a partial cross-sectional schematic diagram of another display substrate provided in at least one embodiment of the present disclosure; Figure 2A for Figure 1A A cross-sectional schematic diagram of the first light-shielding portion of the display substrate; Figure 2B for Figure 1BA cross-sectional schematic diagram of the first light-shielding portion of the display substrate; Figure 3 for Figure 1B A cross-sectional schematic diagram of the display substrate during the manufacturing process; Figure 4 This is a partial cross-sectional schematic diagram of another display substrate provided in at least one embodiment of the present disclosure; Figure 5 A partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure; Figure 6 for Figure 5 A cross-sectional schematic diagram of the first light-shielding portion of the display substrate; Figure 7 A partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure; Figure 8 for Figure 7 A cross-sectional schematic diagram of the first light-shielding portion of the display substrate; Figure 9 A partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure; Figure 10 for Figure 9 A cross-sectional schematic diagram of the first light-shielding portion and a portion of the first color filter pattern of the display substrate; Figure 11 for Figure 9 A cross-sectional schematic diagram of the display substrate during the manufacturing process; Figure 12 A partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure; Figure 13 for Figure 12 A cross-sectional schematic diagram of the first light-shielding portion and a portion of the first color filter pattern of the display substrate; Figure 14 A partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure; Figure 15 for Figure 14 A cross-sectional schematic diagram of the first light-shielding portion and a portion of the first color filter pattern of the display substrate; Figure 16 A partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure; Figure 17 for Figure 16 A cross-sectional schematic diagram of the first light-shielding portion of the display substrate; Figure 18 and Figure 19 A partial cross-sectional schematic diagram of different display substrates provided for embodiments of this disclosure; Figure 20for Figure 18 A cross-sectional schematic diagram of the first light-shielding portion of the display substrate; Figure 21 for Figure 19 A cross-sectional schematic diagram of the first light-shielding portion of the display substrate; Figure 22 A partial cross-sectional schematic diagram of another display substrate provided for at least one embodiment of the present disclosure; Figure 23 for Figure 22 A cross-sectional schematic diagram of the color filter layer of the display substrate; and Figure 24 for Figure 22 A cross-sectional schematic diagram of the display substrate during the manufacturing process. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0026] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure 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 following 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 used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0027] With the rapid development of OLED technology, people's demand for thin and flexible screens is increasing, and the demand for foldable screen phones has been on the rise.

[0028] To meet the demands for thin, light, and flexible screens, OLEDs typically utilize FMLOC + COE technology. In FMLOC (Flexible Multi-layer On Cell) technology, a multi-layer touch structure is formed on the array substrate, resulting in a thinner display substrate with narrower bezels, enabling touch control and improving optical display performance, thus gradually becoming the mainstream technology in the market. COE technology is a technique that saves on the polarizers found in the original OLED structure by creating light-shielding and color filter structures, thereby reducing power consumption and increasing light transmittance.

[0029] In COE technology, because the substrate beneath the color filter structure is not flat enough during its formation, the color filter material flows into the pits during the color filter coating process. This phenomenon is generally called color filter backflow. This backflow phenomenon causes the upper surface of the color filter structure to be uneven, which is not conducive to the output of light at certain angles (such as wide-view light), and ultimately manifests as color shift (different colors at different viewing angles).

[0030] In this regard, embodiments of the present disclosure provide a display substrate, which includes an array substrate and a color filter layer. The array substrate includes a substrate and a plurality of sub-pixels disposed on the substrate. The plurality of sub-pixels include adjacent first sub-pixels and second sub-pixels. The first sub-pixels include a first light-emitting device, and the second sub-pixels include a second light-emitting device. The color filter layer includes a light-shielding pattern and a plurality of color filter patterns. The light-shielding pattern includes a first sub-opening, a second sub-opening, and a first light-shielding portion located between the first sub-opening and the second sub-opening. In a direction perpendicular to the substrate, the first sub-opening exposes the first light-emitting device, the second sub-opening exposes the second light-emitting device, and the plurality of sub-pixels... Each color filter pattern includes a first color filter pattern and a second color filter pattern. The first color filter pattern is at least disposed in a first sub-opening and configured to transmit light emitted by a first light-emitting device. The second color filter pattern is at least disposed in a second sub-opening and configured to transmit light emitted by a second light-emitting device. The color filter layer includes a first color filter sub-layer and a second color filter sub-layer disposed on the side of the first color filter sub-layer away from the substrate. The first color filter sub-layer includes a first color filter pattern, and the second color filter sub-layer includes a second color filter pattern. The first color filter sub-layer and the second color filter sub-layer overlap to form a first light-shielding portion. In the first light-shielding portion, the thickness of the first color filter sub-layer is less than the thickness of the second color filter sub-layer.

[0031] Therefore, in the display substrate provided in the embodiments of this disclosure, a light-shielding pattern and multiple color filter patterns can be formed by multiple color filter sub-layers. In the first light-shielding portion, the thickness of the first color filter sub-layer located in the lower layer (i.e., the layer close to the substrate) is less than the thickness of the second color filter sub-layer. Thus, when the second color filter pattern is formed on the first color filter sub-layer, the ramp height of the second color filter pattern is smaller, which helps to reduce or even eliminate the color filter backflow phenomenon, improve the uniformity and flatness of the second color filter pattern, and improve defects such as color shift. In addition, the first color filter sub-layer can be formed with a smaller thickness through photolithography. At this time, the roughness of the upper surface of the first color filter sub-layer (i.e., the surface away from the substrate) is higher, which helps to reduce the light reflectivity of the display substrate, improve the readability of the device in a strong light environment, and the surface with higher roughness is also conducive to improving the surface adhesion and reducing the risk of peeling between film layers.

[0032] At least one embodiment of this disclosure also provides a display substrate, the display substrate including an array substrate and a color filter layer; the array substrate includes a substrate and a plurality of sub-pixels disposed on the substrate, the plurality of sub-pixels including adjacent first sub-pixels and second sub-pixels, the first sub-pixels including a first light-emitting device, and the second sub-pixels including a second light-emitting device; the color filter layer includes a light-shielding pattern and a plurality of color filter patterns, the light-shielding pattern including a first sub-opening, a second sub-opening, and a first light-shielding portion located between the first sub-opening and the second sub-opening, the first sub-opening exposing the first light-emitting device in a direction perpendicular to the substrate, and the second sub-opening exposing the second light-emitting device; the plurality of color filter patterns including a first color filter pattern and a second color filter pattern, the first color filter pattern being at least disposed in the first sub-opening and configured to transmit light emitted by the first light-emitting device, the second color filter pattern being at least disposed in the second sub-opening and configured to transmit light emitted by the second light-emitting device, wherein the light-shielding pattern includes a black matrix, the cross-section of the first light-shielding portion includes a middle portion and a first edge portion and a second edge portion respectively located on both sides of the middle portion, and the average thickness of at least one of the first edge portion and the second edge portion is less than the average thickness of the middle portion.

[0033] Therefore, in the display substrate provided in the present embodiment, a light-shielding pattern is formed by a black matrix, and the light-shielding pattern forms a pattern with thin edges and thick middle between adjacent sub-pixels. Thus, when a color filter pattern is formed in the opening of the black matrix, it helps to reduce the color filter backflow phenomenon, improve the uniformity and flatness of the color filter pattern, and improve defects such as color shift. Furthermore, the above design can expand the light emission angle, increase the brightness of the display substrate, and thereby improve the display effect of the display substrate.

[0034] At least one embodiment of this disclosure also provides a display substrate, the display substrate including an array substrate and a color filter layer; the array substrate includes a substrate and a plurality of sub-pixels disposed on the substrate, wherein each of the plurality of sub-pixels includes a light-emitting device, the color filter layer includes a light-shielding pattern and a plurality of color filter patterns; the light-shielding pattern includes a plurality of first openings, wherein, in a direction perpendicular to the substrate, the plurality of first openings expose the light-emitting devices of the plurality of sub-pixels; the plurality of color filter patterns are respectively disposed at least in the plurality of first openings and configured to transmit light emitted by the light-emitting devices of the plurality of sub-pixels, wherein the roughness of at least a portion of the surface of the color filter layer away from the substrate is greater than the roughness of at least a portion of the surface of the color filter layer near the substrate.

[0035] Therefore, in the display substrate provided in the embodiments of this disclosure, the roughness of at least a portion of the surface of the color filter layer away from the substrate is greater than the roughness of the surface of the at least a portion of the surface near the substrate, thereby helping to reduce the light reflectivity of the display substrate, improve device readability in strong light environments, and this design also helps to improve surface adhesion and reduce the risk of peeling between film layers.

[0036] The following describes in detail the display substrate and display device provided in this disclosure through several specific embodiments.

[0037] This disclosure provides a display substrate in at least one embodiment. Figure 1A and Figure 1B A partial cross-sectional schematic diagram of the display substrate is shown, as follows: Figure 1A and Figure 1B As shown, the display substrate includes an array substrate 100 and a color filter layer 300, among other structures.

[0038] For example, such as Figure 1A and Figure 1B As shown, the array substrate 100 includes a substrate 110 and a plurality of sub-pixels disposed on the substrate 110. The plurality of sub-pixels include adjacent first sub-pixels SP1 and second sub-pixels SP2. The first sub-pixel SP1 includes a first light-emitting device E1, and for example, it also includes a driving circuit (not shown in the figure) for driving the first light-emitting device E1. The second sub-pixel SP2 includes a second light-emitting device E2, and for example, it also includes a driving circuit (not shown in the figure) for driving the second light-emitting device E2. The first light-emitting device E1 and the second light-emitting device E2 are disposed in a light-emitting device layer 120 on the substrate 110.

[0039] For example, the driving circuit may include multiple transistors and storage capacitors, such as forming a 2T1C (i.e., two transistors and one storage capacitor), 3T1C (i.e., three transistors and one storage capacitor), 7T1C (i.e., seven transistors and one storage capacitor), 8T1C (i.e., eight transistors and one storage capacitor), or 8T2C (i.e., eight transistors and two storage capacitors), etc. The embodiments of this disclosure do not limit the specific form of the driving circuit.

[0040] like Figure 1A and Figure 1B As shown, the color filter layer 300 includes a light-shielding pattern 310 and a plurality of color filter patterns. The light-shielding pattern 310 includes a first sub-opening 311, a second sub-opening 312, and a first light-shielding portion 314 located between the first sub-opening 311 and the second sub-opening 312. In the direction perpendicular to the substrate 110, that is, in the vertical direction shown in the figure, the first sub-opening 311 exposes the first light-emitting device E1 to emit light emitted by the first light-emitting device E1, and the second sub-opening 312 exposes the second light-emitting device E2 to emit light emitted by the second light-emitting device E2.

[0041] like Figure 1A and Figure 1B As shown, the multiple color filter patterns include a first color filter pattern 321 and a second color filter pattern 322. The first color filter pattern 321 is at least disposed in the first sub-opening 311 and configured to transmit light emitted by the first light-emitting device E1. The second color filter pattern 322 is at least disposed in the first sub-opening 311 and configured to transmit light emitted by the second light-emitting device E2. For example, the first light-emitting device E1 is configured to emit light of a first color, and the first color filter pattern 321 is configured to transmit light of the first color; the second light-emitting device E2 is configured to emit light of a second color, and the second color filter pattern 322 is configured to transmit light of the second color; thereby making the emitted color of each sub-pixel purer.

[0042] like Figure 1A and Figure 1B As shown, the color filter layer 300 includes a first color filter sublayer 301 and a second color filter sublayer 302 disposed on the side of the first color filter sublayer 301 away from the substrate 110. The first color filter sublayer 301 includes a first color filter pattern 321, and the second color filter sublayer 302 includes a second color filter pattern 322. The first color filter sublayer 301 and the second color filter sublayer 302 overlap to form a first light-shielding portion 314, for example... Figure 2A It shows Figure 1A A cross-sectional schematic diagram of the first light-shielding portion of the display substrate. Figure 2B It shows Figure 1B A cross-sectional schematic diagram of the first light-shielding portion of the display substrate, as shown in the figure. Figure 2A and Figure 2BAs shown, in the first light-shielding portion 314, the thickness H1 of the first color filter sublayer 301 is less than the thickness H2 of the second color filter sublayer 302.

[0043] Therefore, in the fabrication process of the display substrate provided in the present disclosure embodiment, since the thickness of the first color filter sublayer 301 located in the lower layer (i.e., the layer close to the substrate 110) in the first light-shielding portion 214 is less than the thickness of the second color filter sublayer 302, the step height of the first color filter sublayer 301 at the second sub-opening 312 (and the third sub-opening 323 described later) is smaller. When the second color filter pattern 322 (and the third color filter pattern 323 described later) is formed on the first color filter sublayer 301, the climbing height of the second color filter pattern 322 (and the third color filter pattern 323 described later) is smaller, which helps to weaken or even eliminate the color filter backflow phenomenon and improve the uniformity and flatness of the color filter pattern.

[0044] In addition, the first color filter sublayer 321 can be formed with a smaller thickness through photolithography. At this time, the roughness of the upper surface of the first color filter sublayer 301 (including the first color filter pattern 321) (that is, the surface 301A away from the substrate 110) is higher, which helps to reduce the light reflectivity of the display substrate, improve the readability of the device in strong light environment, and the surface with higher roughness is also conducive to improving the surface adhesion and reducing the risk of peeling between film layers.

[0045] For example, such as Figure 1A and Figure 1B As shown, the multiple sub-pixels also include a third sub-pixel SP3, which includes a third light-emitting device E3. The light-shielding pattern 310 also includes a third sub-opening 313. In a direction perpendicular to the substrate 110, the third sub-opening 313 exposes the third light-emitting device E3 to emit light emitted by the third light-emitting device E3. The multiple color filter patterns also include a third color filter pattern 323, which is at least disposed in the third sub-opening 313 and configured to transmit light emitted by the third light-emitting device E3.

[0046] For example, such as Figure 1A As shown, the color filter layer 300 also includes a third color filter sublayer 303 disposed on the side of the second color filter sublayer 302 away from the substrate, and the third color filter sublayer 303 includes a third color filter pattern 323.

[0047] For example, in Figure 1AIn the example, the thickness of the second color filter sublayer 302 can be less than the thickness of the third color filter sublayer 303. For example, the thickness of the second color filter pattern 322 is less than the thickness of the third color filter pattern 323; or, the thickness of both the first color filter sublayer 301 and the second color filter sublayer 302 is less than the thickness of the third color filter sublayer 303. For example, the thickness of both the first color filter pattern 321 and the second color filter pattern 322 is less than the thickness of the third color filter pattern 323.

[0048] For example, such as Figure 1B As shown, the color filter layer 300 further includes a third color filter sublayer 303 disposed between the first color filter sublayer 301 and the second color filter sublayer 302. The third color filter sublayer 303 includes a third color filter pattern 323, such as... Figure 2B As shown, the first color filter sublayer 301, the second color filter sublayer 302, and the third color filter sublayer 303 overlap to form a first light-shielding portion 314. In the first light-shielding portion 314, the thickness H1 of the first color filter sublayer 301 is less than the thickness H3 of the third color filter sublayer 303, and / or, the thickness H1 of the first color filter sublayer 301 is less than the thickness H2 of the second color filter sublayer 302. For example, in the first light-shielding portion 314, the thickness H3 of the third color filter sublayer 303 may be less than or equal to the thickness H2 of the second color filter sublayer 302. For example, in some examples, in the first light-shielding portion 314, the thickness H1 of the first color filter sublayer 301 is less than the thickness H3 of the third color filter sublayer 303, and the thickness H2 of the second color filter sublayer 302 is not specifically limited. For example, the thickness H2 of the second color filter sublayer 302 can be greater than or equal to the thickness H3 of the third color filter sublayer 303; or, the thickness H1 of the first color filter sublayer 301 is less than the thickness H2 of the second color filter sublayer 302, and the thickness H3 of the third color filter sublayer 303 is not specifically limited. The thickness H3 of 303 is not specifically limited. For example, the thickness H3 of the third color filter sublayer 303 can be less than or equal to the thickness H2 of the second color filter sublayer 302; or, the thickness H1 of the first color filter sublayer 301 is less than the thickness H3 of the third color filter sublayer 303, and the thickness H1 of the first color filter sublayer 301 is less than the thickness H2 of the second color filter sublayer 302. In this case, the thickness H3 of the third color filter sublayer 303 can be less than or equal to the thickness H2 of the second color filter sublayer 302.

[0049] For example, in other examples, the first light-shielding portion 314 may not have a third color film sublayer 303, but only a first color film sublayer 301 and a second color film sublayer 302.

[0050] For example, in Figure 1BIn this embodiment, color filter pattern 323 can also be regarded as the first color filter pattern, color filter pattern 322 as the second color filter pattern, and color filter pattern 321 as the third color filter pattern. In this case, color filter sublayer 303 and color filter sublayer 302 overlap to form a first light-shielding portion. In the first light-shielding portion, the thickness H3 of color filter sublayer 303 is less than the thickness H2 of color filter sublayer 302. For example, the first light-shielding portion may include color filter sublayer 301 or may not include color filter sublayer 301. When the first light-shielding portion includes color filter sublayer 301, color filter sublayer 303 is located between color filter sublayer 302 and color filter sublayer 301. The thickness H1 of color filter sublayer 301 is not specifically limited. For example, the thickness H1 of color filter sublayer 301 may be less than or equal to the thickness H3 of color filter sublayer 303.

[0051] Alternatively, color filter pattern 321 can be considered as the first color filter pattern 321, color filter pattern 323 as the second color filter pattern, and color filter pattern 322 as the third color filter pattern. Color filter sublayers 301 and 303 overlap to form a first light-shielding portion. In this case, in the first light-shielding portion, the thickness H1 of color filter sublayer 301 is less than the thickness H3 of color filter sublayer 303. For example, the first light-shielding portion may include color filter sublayer 302 or may not include color filter sublayer 302. When the first light-shielding portion includes color filter sublayer 302, color filter sublayer 303 is located between color filter sublayer 302 and color filter sublayer 301, and the thickness H2 of color filter sublayer 302 may be less than or equal to the thickness H3 of color filter sublayer 303.

[0052] For example, as shown in Figure 1 and Figure 3 As shown, the thickness of the first color filter pattern 321 is equal to the thickness H1 of the first color filter sublayer 301 in the first light-shielding portion 314. At this time, the thickness of the first color filter sublayer 301 is uniform and the overall thickness is relatively thin. In the preparation process, it can be formed, for example, by a thinning process (e.g., photolithography).

[0053] For example, Figure 3 It shows Figure 1B A cross-sectional schematic diagram of the display substrate during the manufacturing process, as shown in the figure. Figure 3 As shown, after the array substrate 100 and the touch layer 200 (described later) are fabricated, a material 3010 is formed on the touch layer 200 to form the first color filter sublayer 301 by means of coating or other methods. For example, the material 3010 can be a photoresist material, which can be a positive photoresist or a negative photoresist. The embodiments disclosed herein do not specifically limit this. In this embodiment, a negative photoresist material is used as an example for description, and other cases can be referred to accordingly.

[0054] For example, such as Figure 3As shown, a halftone mask 400 is provided. The mask 400 includes a first light-transmitting portion 401 and a non-light-transmitting portion 402. The non-light-transmitting portion 402 is opaque, meaning its transmittance is 0%, corresponding to the area where material needs to be removed, i.e., the area corresponding to the second and third sub-openings. The first light-transmitting portion 401 is a semi-transmitting portion with low transmittance, for example, 20%-50%, corresponding to the area where material needs to be partially removed, i.e., the area corresponding to the first sub-opening and the area where a light-shielding pattern needs to be formed. For example, the first light-transmitting portion 401 also corresponds to the area where the first light-emitting device E1 and the touch electrodes of the touch layer 200 (described in detail later) are located, and the non-light-transmitting portion 402 corresponds to the area where the second light-emitting device E2 and the third light-emitting device E3 are located.

[0055] After the material 3010 is exposed by the mask 400, the material 3010 is developed, thereby partially removing the material corresponding to the first light-transmitting portion 401 to reduce the thickness of that portion, and completely removing the material corresponding to the non-light-transmitting portion 402 to form an opening, thus forming a thinner first color film sublayer 301.

[0056] In the above embodiments, because the etching process (e.g., development process) of the first color filter sublayer 301 is uneven, therefore, as Figure 2B As shown, the surface roughness 301A of the first color filter sublayer 301, which is farther from the substrate 110, is greater than the surface roughness 301B, which is closer to the substrate 110. This helps to reduce the light reflectivity of the display substrate, improve device readability in strong light environments, and the higher surface roughness also helps to improve surface adhesion and reduce the risk of interlayer peeling.

[0057] During the preparation process, the coating thickness of material 3010 is limited by the equipment capability, i.e., it has a minimum thickness limit and cannot be thinned further, resulting in severe color filter backflow. In the preparation method provided in the embodiments of this disclosure, the thickness of the first color filter sublayer 301 is not limited, and a thicker coating can be applied. Finally, the first color filter sublayer 301 is thinned to any thickness, such as less than 1.2 μm, through a thinning process. As a result, when the second color filter pattern 322 and the third color filter pattern 323 are subsequently formed, the step difference formed at the opening is smaller, and the climbing height of the color filter material is smaller, so as to significantly improve the color filter backflow phenomenon and improve the uniformity and flatness of the color filter.

[0058] For example, the structure of the light-blocking portion between the sub-openings of each two adjacent sub-pixels is basically the same as that of the first light-blocking portion 314, and is formed using basically the same method, which will not be described in detail here.

[0059] For example, in some embodiments, such as Figure 1B As shown, the display substrate may also include a touch layer 200 disposed on the array substrate 100. The touch layer 200 includes a first insulating layer 201, a first conductive layer 202, a second insulating layer 203, and a second conductive layer 204, etc.

[0060] For example, the first insulating layer 201 can be a buffer layer, made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride; the first conductive layer 202 is disposed on the side of the first insulating layer 201 away from the substrate 110, and the first conductive layer 202 can include a first touch electrode, made of materials such as metal, alloy, or transparent conductive oxide; the second insulating layer 203 can be a spacer insulating layer, disposed on the side of the first conductive layer 202 away from the substrate 110, and the second insulating layer 203 can be made of organic insulating materials such as polyimide or resin, or inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride; the second conductive layer 204 is disposed on the side of the second insulating layer 203 away from the substrate 110, and the second conductive layer 204 can include a second touch electrode, made of materials such as metal, alloy, or transparent conductive oxide. The second touch electrode is electrically connected to the first touch electrode through a via in the second insulating layer 203, or, in some examples, the second touch electrode may not be electrically connected to the first touch electrode. The touch layer 200 can realize touch functionality.

[0061] For example, in Figures 1B-3 In one embodiment, the first color filter sublayer 301 can be directly formed on the second conductive layer 204 of the touch layer 200, in which case the first color filter sublayer 301 and the second conductive layer 204 are in direct contact; for example, in other embodiments, such as Figure 4 As shown, the touch layer 200 may further include a third insulating layer 205, which is disposed on the side of the second conductive layer 204 away from the substrate 110. The third insulating layer 205 may be a passivation layer, and may be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride, or organic insulating materials such as polyimide or resin. In this case, the first color filter sublayer 301 may be formed on the side of the third insulating layer 205 away from the substrate 110.

[0062] For example, such as Figure 1B As shown, the array substrate 100 may further include an encapsulation layer 130. The encapsulation layer 130 may be a composite encapsulation layer, including a first inorganic encapsulation layer 131, an organic encapsulation layer 132, and a second inorganic encapsulation layer 133. For example, the first inorganic encapsulation layer 131 and the second inorganic encapsulation layer 133 may be made of inorganic insulating materials such as silicon oxide, silicon nitride, or silicon oxynitride, and the organic encapsulation layer 132 may be made of organic insulating materials such as polyimide or resin. For example, the first insulating layer 201 is disposed on the side of the encapsulation layer 130 away from the substrate 110.

[0063] For example, in Figure 1B In some embodiments, the second color filter sublayer 302 and the third color filter sublayer 303 may not undergo a thinning process to simplify the preparation process.

[0064] For example, such as Figure 1B and Figure 2B As shown, the thickness H3 of the third color filter sublayer 303 is not much different from the thickness H2 of the second color filter sublayer 302. For example, the difference between the thickness H3 of the third color filter sublayer 303 and the thickness H2 of the second color filter sublayer 302 is less than 30% of the thickness H3 of the third color filter sublayer 303 or the thickness H2 of the second color filter sublayer 302.

[0065] For example, in other embodiments, the third color filter sublayer 303 may also be formed by a thinning process (e.g., photolithography) to have a structure that is substantially the same as that of the first color filter sublayer 301 and to achieve substantially the same technical effect.

[0066] For example, Figure 5 This is a partial cross-sectional schematic diagram of another display substrate provided in at least one embodiment of the present disclosure. Figure 6 for Figure 5 A cross-sectional schematic diagram of the first light-shielding portion of the display substrate, as shown in the figure. Figure 5 and Figure 6 As shown, in the first light-shielding portion 314, the thickness H1 of the first color filter sub-layer 301 is less than the thickness H2 of the second color filter sub-layer 302, and the thickness H3 of the third color filter sub-layer 303 is less than the thickness H2 of the second color filter sub-layer 302. At this time, the thickness of the third color filter sub-layer 303 is also relatively thin, for example, formed through a thinning process. For details on the formation method, please refer to [reference needed]. Figure 3 The formation method of the first color filter sub-layer 301 in the embodiment will not be described again here. For example, in the first light-shielding portion 314, the thickness H1 of the first color filter sub-layer 301 and the thickness H3 of the third color filter sub-layer 303 can be the same or different.

[0067] For example, such as Figure 6 As shown, in this embodiment, the thickness H1 of the first color filter sub-layer 301 and the thickness H3 of the third color filter sub-layer 303 are not much different. For example, the difference between the thickness H1 of the first color filter sub-layer 301 and the thickness H3 of the third color filter sub-layer 303 is less than 30% of the thickness H1 of the first color filter sub-layer 301 or the thickness H3 of the third color filter sub-layer 303.

[0068] In the above embodiments, since both the first color filter sublayer 301 and the third color filter sublayer 303 are formed through a thinning process, the roughness of the surface of the first color filter pattern 321 away from the substrate is greater than the roughness of the surface near the substrate. Similarly, the roughness of the surface of the first color filter sublayer 301 in the first light-shielding portion 314 away from the substrate is greater than the roughness of the surface near the substrate. Furthermore, the roughness of the surface of the third color filter pattern 323 away from the substrate is greater than the roughness of the surface near the substrate. This helps to reduce the light reflectivity of the display substrate, improve device readability in strong light environments, and the higher surface roughness also helps to improve surface adhesion and reduce the risk of interlayer peeling.

[0069] For example, in some other embodiments, the first color filter sublayer 301, the third color filter sublayer 303, and the second color filter sublayer 302 can all be formed by a thinning process, so that the third color filter sublayer 303 and the second color filter sublayer 302 have a structure that is basically the same as that of the first color filter sublayer 301 and achieve the same technical effect.

[0070] For example, in some examples, at least one of the first color filter sublayer 301, the third color filter sublayer 303, and the second color filter sublayer 302 can be thinned; for example, only the middle color filter sublayer (e.g., the third color filter sublayer 303) can be thinned, in which case, in the first light-shielding portion 314, the thickness of the third color filter sublayer 303 is less than the thickness H1 of the first color filter sublayer 301 and less than the thickness H2 of the second color filter sublayer 302; or, only the middle and uppermost color filter sublayers (e.g., the third color filter sublayer 303) can be thinned. 3. The thickness H3 of the third color filter sublayer 303 and the thickness H2 of the second color filter sublayer 302 are less than the thickness H1 of the first color filter sublayer 301 in the first light-shielding portion 314; or, only the bottommost and topmost color filter sublayers (e.g., the first color filter sublayer 301 and the second color filter sublayer 302) are thinned. In this case, the thickness H1 of the first color filter sublayer 301 and the thickness H2 of the second color filter sublayer 302 are less than the thickness H3 of the third color filter sublayer 303 in the first light-shielding portion 314.

[0071] For example, Figure 7 This is a partial cross-sectional schematic diagram of another display substrate provided in at least one embodiment of the present disclosure. Figure 8 for Figure 7 A cross-sectional schematic diagram of the first light-shielding portion of the display substrate, as shown in the figure. Figure 7 and Figure 8As shown, in the first light-shielding portion 314, the thicknesses H1 of the first color filter sub-layer 301, H2 of the second color filter sub-layer 302, and H3 of the third color filter sub-layer 303 are not significantly different. For example, the difference between any two of the thicknesses H1, H2, and H3 is less than 30% of either thickness H1, H2, or H3. At this time, the thicknesses of the first color filter sub-layer 301, the second color filter sub-layer 302, and the third color filter sub-layer 303 are all relatively thin, for example, formed through a thinning process (e.g., photolithography). Specific formation methods can be found in [reference needed]. Figure 3 The specific implementation will not be described in detail here. Therefore, the relatively thin color filter sub-layers can improve light transmittance and increase the display brightness of the display substrate. Furthermore, the fact that the three color filter sub-layers are of approximately the same thickness can also improve hue and reduce the light reflectivity of the display substrate.

[0072] For example, since the first color filter sublayer 301, the second color filter sublayer 302, and the third color filter sublayer 303 are all formed through a thinning process, the surface roughness of the first color filter pattern 321 away from the substrate is greater than the surface roughness of the surface close to the substrate. Similarly, in the first light-shielding portion 314, the surface roughness of the first color filter sublayer 301 away from the substrate is greater than the surface roughness of the surface close to the substrate, the surface roughness of the second color filter pattern 322 away from the substrate is greater than the surface roughness of the surface close to the substrate, and the surface roughness of the third color filter pattern 323 away from the substrate is greater than the surface roughness of the surface close to the substrate. This helps to reduce the light reflectivity of the display substrate, improve device readability in strong light environments, and the higher surface roughness also helps to improve surface adhesion and reduce the risk of interlayer delamination.

[0073] For example, in the various embodiments described above, the first color filter sublayer 301 has a uniform thickness. For example, in other embodiments, the first color filter sublayer 301 may have different thicknesses in different regions.

[0074] For example, Figure 9 This is a partial cross-sectional schematic diagram of another display substrate provided in at least one embodiment of the present disclosure. Figure 10 for Figure 9 A cross-sectional schematic diagram of the first light-shielding portion and a portion of the first color filter pattern of the display substrate, as shown in the figure. Figure 9 and Figure 10 As shown, the thickness D1 of the first color filter pattern 321 is greater than the thickness H1 of the first color filter sublayer 301 in the first light-shielding portion 314.

[0075] For example, Figure 9 and Figure 10In the embodiment, in the first light-shielding portion 314, the thickness H1 of the first color filter sublayer 301 is less than the thickness H2 of the second color filter sublayer 302 and the thickness H3 of the third color filter sublayer 303. During the fabrication process, the first color filter sublayer 301 can be formed by a partial thinning process. Thus, while ensuring the thickness of the first color filter pattern 321, the thickness of the first color filter sublayer 301 at the sidewalls of the second sub-opening 312 and the third sub-opening 313 is thinner, so as to form a smaller step difference, so that the climbing height of the second color filter pattern 322 and the third color filter pattern 323 during formation is lower, thereby reducing or even eliminating the color filter backflow phenomenon and improving the uniformity and flatness of the color filter pattern.

[0076] For example, in this case, in the first light-shielding portion 314, the thickness H3 of the third color filter sub-layer 303 can also be less than the thickness H2 of the second color filter sub-layer 302, or the thicknesses H1, H2 and H3 can all be thinned to a smaller thickness. The above embodiments are applicable to various situations.

[0077] For example, Figure 11 It shows Figure 9 A cross-sectional schematic diagram of the display substrate during the manufacturing process, as shown in the figure. Figure 11 As shown, after the array substrate 100 and the touch layer 200 are fabricated, a material 3010 is formed on the touch layer 200 to form the first color filter sub-layer 301 by means of coating or other methods. For example, the material 3010 can be a photoresist material, which can be a positive photoresist or a negative photoresist. The embodiments disclosed herein do not specifically limit this. In this embodiment, a negative photoresist material is used as an example for description, and other cases can be referred to accordingly.

[0078] For example, such as Figure 11 As shown, a halftone mask 400 is provided, including a first light-transmitting portion 401, a non-light-transmitting portion 402, and a fully light-transmitting portion 403. The light transmittance of the first light-transmitting portion 401 is lower than that of the fully light-transmitting portion 403, but higher than that of the non-light-transmitting portion 402. For example, the non-light-transmitting portion 402 is opaque, i.e., its transmittance is 0%, corresponding to the area where the material needs to be completely removed. The first light-transmitting portion 401 has a low transmittance, for example, a transmittance of 20%-50%, corresponding to the area where the material needs to be partially removed. The transmittance of the fully light-transmitting portion 403 is greater than that of the first light-transmitting portion 401. For example, the transmittance of the fully light-transmitting portion 403 can be 100% or close to 100%, corresponding to the area where the material needs to be completely or partially retained.

[0079] For example, the first light-transmitting portion 401 corresponds to the area where the light-shielding pattern 310 needs to be formed, and also corresponds to the area where the touch electrode of the touch layer 200 is located; the non-light-transmitting portion 402 corresponds to the area where the second light-emitting device E2 and the third light-emitting device E3 are located; and the fully light-transmitting portion 403 corresponds to the area where the first light-emitting device E1 is located.

[0080] After the material 3010 is exposed through the mask 400, the material 3010 is developed, thereby partially removing the material corresponding to the first light-transmitting portion 401, thus reducing the thickness. The material corresponding to the non-light-transmitting portion 402 of the material 3010 is completely removed, thus forming an opening. The material corresponding to the fully light-transmitting portion 403 of the material 3010 is retained to form the first color film pattern 321. The thickness of the first color film sublayer 301 formed therein varies in different regions.

[0081] For example, in the above preparation process, the coating thickness of material 3010 can be 3μm. After being processed by the mask template 400, the first color filter sublayer 301 in the first light-shielding portion 314 can retain a thickness of less than 1.5μm. As a result, when the second color filter sublayer 302 and the third color filter sublayer 303 are formed, the climbing height of the color filter material at the opening is smaller, thereby significantly improving the color filter backflow phenomenon, improving the uniformity and flatness of the color filter pattern, and improving the color deviation and other defects of the display substrate.

[0082] For example, in the above embodiment, since the first color filter sublayer 301 is thinned by an etching process (e.g., a developing process), therefore, as Figure 10 As shown, the surface roughness 301A of the first color film sublayer 301 in the first light-shielding portion 314 that is away from the substrate 110 is greater than the surface roughness 301B that is close to the substrate 110. This helps to reduce reflectivity, improve device readability in strong light environment, and also helps to improve surface adhesion and reduce the risk of peeling between film layers.

[0083] For example, in some embodiments, such as Figure 9 and Figure 10 As shown, the thickness D1 of the first color filter pattern 321 is greater than or equal to the sum of the thicknesses of the first color filter sublayer 301 and the third color filter sublayer 303 in the first light-shielding portion 314. At this time, the overall thickness of the first color filter sublayer 301 and the third color filter sublayer 303 is relatively small, which can reduce the color filter backflow phenomenon when the second color filter sublayer 302 is subsequently formed.

[0084] For example, in some examples, the thickness D1 of the first color filter pattern 321 is less than the sum of the thicknesses of the first color filter sublayer 301, the second color filter sublayer 302 and the third color filter sublayer 303 in the first light-shielding portion 314, or the thickness D1 of the first color filter pattern 321 may also be less than the sum of the thicknesses of the first color filter sublayer 301 and the third color filter sublayer 303.

[0085] For example, Figure 9 This illustrates a case where the thickness D1 of the first color filter pattern 321 is approximately equal to the sum of the thicknesses of the first color filter sublayer 301 and the third color filter sublayer 303 in the first light-shielding portion 314.

[0086] For example, in other embodiments, both the first color filter sublayer 301 and the third color filter sublayer 303 can be configured as follows: Figure 11 The partial thinning process shown, for example, Figure 12 This is a partial cross-sectional schematic diagram of another display substrate provided in at least one embodiment of the present disclosure. Figure 13 It shows Figure 12 A cross-sectional schematic diagram of the first light-shielding portion and part of the first color filter pattern of the display substrate, combined with... Figure 12 and Figure 13 The thickness D1 of the first color filter pattern 321 is greater than the thickness H1 of the first color filter sublayer 301 in the first light-shielding portion 314, and the thickness D3 of the third color filter pattern 323 is greater than the thickness H3 of the third color filter sublayer 303 in the first light-shielding portion 314.

[0087] For example, Figure 12 and Figure 13 In the embodiment, the thickness D1 of the first color filter pattern 321 is greater than the sum of the thicknesses of the first color filter sub-layer 301 and the third color filter sub-layer 303 in the first light-shielding portion 314. At this time, the overall thickness of the first color filter sub-layer 301 and the third color filter sub-layer 303 is smaller, which can reduce the color filter backflow phenomenon when the second color filter sub-layer 302 is formed subsequently.

[0088] For example, such as Figure 12 and Figure 13 As shown, in the first light-shielding portion 314, the thickness H1 of the first color filter sub-layer 301 and the thickness H3 of the third color filter sub-layer 303 are not significantly different. For example, the difference between the thickness H3 of the third color filter sub-layer 303 and the thickness H1 of the first color filter sub-layer 301 is less than the thickness H3 of the third color filter sub-layer 303 or 30% of the thickness H1 of the first color filter sub-layer 301. For example, the thickness H1 of the first color filter sub-layer 301 and the thickness H3 of the third color filter sub-layer 303 are substantially the same. For example, in other embodiments, the thickness H1 of the first color filter sub-layer 301 and the thickness H3 of the third color filter sub-layer 303 are different.

[0089] For example, in Figure 12 and Figure 13 During the fabrication of the display substrate, after the mask 400 process, only a thickness of less than 1.5 μm is retained in the first light-shielding portion 314. As a result, only a step height of less than 1.5 μm is formed at the second sub-opening 312 and the third sub-opening 313. When the third color filter pattern 323 is subsequently formed, the color filter material only undergoes a step height of less than 1.5 μm, which significantly improves the color filter backflow phenomenon when forming the third color filter pattern 323 and improves the uniformity and flatness of the third color filter pattern 323. Similarly, after the third color filter pattern 323 is formed, when the second color filter pattern 322 is formed, since the thickness of the first color filter sub-layer 301 and the third color filter sub-layer 303 in the first light-transmitting portion 314 is less than 1.5 μm, the film step height of the material of the second color filter pattern is less than 3 μm, which significantly improves the color filter backflow phenomenon when forming the second color filter pattern 322 and improves the uniformity and flatness of the second color filter pattern 322.

[0090] For example, in other embodiments, at least one of the first color filter sublayer 301, the third color filter sublayer 303, and the second color filter sublayer 302 can be configured as follows: Figure 11 The partial thinning process shown can, for example, be performed only on the third color filter sublayer 303. Figure 11 The partial thinning process shown can also be performed only on the second color filter sublayer 302 and the third color filter sublayer 303. Figure 11 The partial thinning process is shown.

[0091] For example, in other embodiments, the first color filter sublayer 301, the third color filter sublayer 303, and the second color filter sublayer 302 can all be configured as follows: Figure 11 The partial thinning process shown, for example, Figure 14 This is a partial cross-sectional schematic diagram of another display substrate provided in at least one embodiment of the present disclosure. Figure 15 for Figure 14 A cross-sectional schematic diagram of the first light-shielding portion and part of the first color filter pattern of the display substrate, combined with... Figure 14 and Figure 15 The thickness D1 of the first color filter pattern 321 is greater than the thickness H1 of the first color filter sublayer 301 in the first light-shielding portion 314, the thickness D3 of the third color filter 323 is greater than the thickness H3 of the third color filter sublayer 303 in the first light-shielding portion 314, and the thickness D2 of the second color filter pattern 323 is greater than the thickness H2 of the second color filter sublayer 302 in the first light-shielding portion 314.

[0092] For example, such as Figure 14 and Figure 15As shown, the thickness D1 of the first color filter pattern 321 is greater than the sum of the thicknesses of the first color filter sub-layer 301 and the third color filter sub-layer 303 in the first light-shielding portion 314. At this time, the overall thickness of the first color filter sub-layer 301 and the third color filter sub-layer 303 is smaller, which can reduce the color filter backflow phenomenon when the second color filter sub-layer 302 is formed later.

[0093] For example, in other embodiments, the thickness D1 of the first color filter pattern 321 may be equal to or less than the sum of the thicknesses of the first color filter sublayer 301 and the third color filter sublayer 303 in the first light-shielding portion 314.

[0094] For example, such as Figure 14 and Figure 15 As shown, in the first light-shielding portion 314, the thickness H1 of the first color filter sub-layer 301, the thickness H2 of the second color filter sub-layer 302, and the thickness H3 of the third color filter sub-layer 303 are not significantly different. For example, the difference between any two of the thicknesses H1, H2, and H3 is less than 30% of the thicknesses H1, H2, or H3.

[0095] For example, in some embodiments, the thickness D1 of the first color filter pattern 321 may also be less than the sum of the thicknesses of the first color filter sublayer 301 and the third color filter sublayer 303 in the first light-shielding portion 314, and the specific design can be made according to the requirements.

[0096] For example, in the various embodiments described above, that is Figures 1A-15 In the embodiments, the thickness of the thinned portion of the color filter sublayer (e.g., corresponding to the first light-transmitting portion 401 in the mask 400) can be less than 1.2 μm, for example, 0.4 μm-1.1 μm. For example, the thickness of the first color filter sublayer 301 in the first light-shielding portion 314 can be 0.4 μm-1.1 μm, such as 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1.0 μm, or 1.1 μm. Therefore, the thickness of the first color filter sublayer 301 is thinner, for example, less than the process limit thickness of the equipment. Consequently, when forming the color filter pattern in the opening formed by the first color filter sublayer 301, the material ramp height of the color filter is lower, which helps to reduce the color filter backflow phenomenon.

[0097] For example, the thickness of the unthinned portion of the color filter sublayer (e.g., corresponding to the fully transparent portion 403 in the mask 400) can be 1.2 μm-5.0 μm, for example, in Figures 9-15In the embodiments, the thickness of the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323 can be 1.2μm-5.0μm, such as 1.2μm, 1.5μm, 2.0μm, 2.5μm, 3.0μm, 3.5μm, 4.0μm, 4.5μm, or 5.0μm, etc., and can be selected according to the specific characteristics of the material.

[0098] For example, in the various embodiments described above, that is Figures 1A-15 In the embodiment, the first color filter sublayer 301 is formed on a flat surface, and no color filter backflow phenomenon occurs. Therefore, the surface of the first color filter pattern 321 away from the substrate is a flat surface without depressions. The second color filter pattern 322 and the third color filter pattern 323 formed after the first color filter sublayer 301 may have slight color filter backflow phenomenon during the formation process. Therefore, even if a depression is formed, the curvature of the depression is very small, for example, negligible, in order to improve color shift and other problems.

[0099] For example, in some embodiments, the light transmittance of the first light-transmitting portion 401 in the mask 400 can be adjusted so that the surfaces of the second color filter pattern 322 and the third color filter pattern 323 away from the substrate are closer to flat surfaces. For example, the light transmittance of the first light-transmitting portion 401 in the mask 400 can be made into a gradual form, such as the light transmittance of the first light-transmitting portion 401 gradually decreasing from the middle to the edge, or the light transmittance of the first light-transmitting portion 401 in the area corresponding to the sub-opening and its surrounding area gradually decreasing from the middle to the edge, so that the color filter material corresponding to the first light-transmitting portion 401 is exposed to different degrees in different parts, thereby promoting the formation of a flat surface.

[0100] For example, in Figures 1A-15 In the embodiments, since the first color filter sublayer 301 is at least partially thinned, the thinned portion has undergone an etching process (e.g., a developing process), so the surface roughness of the etched portion is higher, that is, the surface roughness of the etched portion is higher than that of the unetched surface. This helps the surface reflectivity to light, improves the readability of the device in a strong light environment, and the surface with higher roughness also helps to improve surface adhesion and reduce the risk of delamination between film layers.

[0101] At least one embodiment of this disclosure also provides a display substrate. Figure 16 A partial cross-sectional schematic diagram of the display substrate is shown, as follows: Figure 16 As shown, the display substrate includes an array substrate 100 and a color filter layer 300, among other structures.

[0102] like Figure 16As shown, the array substrate 100 includes a substrate 110 and a plurality of sub-pixels disposed on the substrate 110. The plurality of sub-pixels include adjacent first sub-pixels SP1 and second sub-pixels SP2. The first sub-pixel SP1 includes a first light-emitting device E1, and for example, it also includes a driving circuit (not shown in the figure) for driving the first light-emitting device E1. The second sub-pixel SP2 includes a second light-emitting device E2, and for example, it also includes a driving circuit (not shown in the figure) for driving the second light-emitting device E2. The first light-emitting device E1 and the second light-emitting device E2 are disposed in a light-emitting device layer 120 on the substrate 110.

[0103] like Figure 16 As shown, the color filter layer 300 includes a light-shielding pattern 310 and a plurality of color filter patterns. The light-shielding pattern 310 includes a first sub-opening 311, a second sub-opening 312, and a first light-shielding portion 314 located between the first sub-opening 311 and the second sub-opening 312. In the direction perpendicular to the substrate 110, that is, in the vertical direction shown in the figure, the first sub-opening 311 exposes the first light-emitting device E1 to emit light emitted by the first light-emitting device E1, and the second sub-opening 312 exposes the second light-emitting device E2 to emit light emitted by the second light-emitting device E2.

[0104] like Figure 16 As shown, the multiple color filter patterns include a first color filter pattern 321 and a second color filter pattern 322. The first color filter pattern 321 is at least disposed in the first sub-opening 311 and configured to transmit light emitted by the first light-emitting device E1. The second color filter pattern 322 is at least disposed in the first sub-opening 311 and configured to transmit light emitted by the second light-emitting device E2. For example, the first light-emitting device E1 is configured to emit light of a first color, and the first color filter pattern 321 is configured to transmit light of the first color; the second light-emitting device E2 is configured to emit light of a second color, and the second color filter pattern 322 is configured to transmit light of the second color; thereby making the emitted color of the sub-pixel purer.

[0105] For example, such as Figure 16 As shown, the light-blocking pattern 310 includes a black matrix (in other embodiments, the black matrix can also be replaced by a form of multiple color filter sublayers stacked as in the above embodiments), such as Figure 17 As shown, the cross-section of the first light-shielding portion 314 includes a middle portion 3141 and a first edge portion 3142 and a second edge portion 3143 located on both sides of the middle portion 3141, respectively. The average thickness of at least one of the first edge portion 3142 and the second edge portion 3143 is less than the average thickness of the middle portion 3141.

[0106] In embodiments of this disclosure, the “average thickness” of a structure refers to the average thickness of the structure at various locations in a direction perpendicular to the substrate 110. For example, when the thickness of the structure is uniform, the average thickness of the structure is equal to the thickness at any location; when the thickness of the structure is gradually varied, the average thickness of the structure is equal to the thickness at the middle location of the varied portion (described in detail later).

[0107] Furthermore, the embodiments of this disclosure do not limit the width of the middle portion 3141, the first edge portion 3142, and the second edge portion 3143, and can be adjusted according to requirements.

[0108] For example, such as Figure 16 As shown, the edge of the first color filter pattern 321 can overlap the first edge portion 3142 / second edge portion 3143 on both sides of the first sub-opening 311, and in some examples it can also overlap the middle portion 3141, so that the thickness of the first color filter pattern 321 is different in different areas, for example in Figure 16 Three different thicknesses are formed in the middle; similarly, the edge of the second color filter pattern 322 can overlap the first edge portion 3142 / second edge portion 3143 on both sides of the second sub-opening 312, and in some examples it can also overlap the middle portion 3141, so that the thickness of the second color filter pattern 322 is different in different areas, for example in Figure 16 Three different thicknesses are formed in the middle; the edge of the third color film pattern 323 can overlap the first edge portion 3142 / second edge portion 3143 on both sides of the third sub-opening 313, and in some examples it can also overlap the middle portion 3141, so that the thickness of the second color film pattern 322 is different in different areas, for example in Figure 16 Three different thicknesses are formed in the middle.

[0109] For example, such as Figure 17 As shown, in the first light-shielding portion 314, the average thickness L2 of the first edge portion 3142 is less than the average thickness L1 of the middle portion 3141, and the cross-sections of the first edge portion 3142 and the middle portion 3141 are generally stepped. For example, the average thickness L3 of the second edge portion 3143 is less than the average thickness L1 of the middle portion 3141, and the cross-sections of the second edge portion 3143 and the middle portion 3141 are generally stepped. For example, the average thickness L2 of the first edge portion 3142 and the average thickness L3 of the second edge portion 3143 are substantially the same, thereby forming substantially the same light-emitting range in different sub-pixels.

[0110] For example, in some examples, the average thickness L2 of the first edge portion 3142 and the average thickness L3 of the second edge portion 3143 may be different, thereby forming different light-emitting ranges in different sub-pixels to adjust the light-emitting effect of different sub-pixels. In this case, the thickness of the color filter pattern formed on the first edge portion 3142 and the second edge portion 3143 with different average thicknesses can be different.

[0111] For example, in some embodiments, the average thickness L1 of the middle portion 3141 can be 1.2μm-2.0μm, such as 1.2μm, 1.3μm, 1.4μm, 1.5μm, 1.6μm, 1.7μm, 1.8μm, 1.9μm, or 2.0μm, etc., and the average thickness L2 of the first edge portion 3142 and the average thickness L3 of the second edge portion 3143 can be less than or equal to 1.0μm, such as less than or equal to 0.85μm, less than or equal to 0.65μm, 0.6μm, or 0.5μm, etc.

[0112] At this point, the first edge portion 3142 and the second edge portion 3143 can be formed by an edge thinning process using a halftone mask, as detailed in the reference. Figure 11 Preparation method of .

[0113] Therefore, as Figure 17 As shown, the first edge portion 3142 and the second edge portion 3143 are relatively thin. On the one hand, this can reduce or even avoid the color filter backflow phenomenon during the preparation process, making the color filter pattern formed in the first sub-opening 311 and the second sub-opening 312 flatter. On the other hand, it can also reduce the light blocking effect of the light-shielding pattern 310, and improve the emissivity of large-angle light, for example... Figure 17 As shown by the solid arrow in the image, compared to the first light-shielding portion 314 with uniform thickness, the angle of light emission (e.g.) Figure 17 (as shown by the dashed arrow in the image). Figure 17 In the embodiments described, the display substrate has a higher wide-angle light emission rate, a wider viewing angle, and higher brightness, thereby improving the display effect of the display substrate.

[0114] For example, in Figure 17 In this embodiment, the first edge portion 3142 and the second edge portion 3143 are formed by a thinning process, such that the roughness of the surface A1 of the first edge portion 3142 and the second edge portion 3143 away from the substrate 110 is greater than the roughness of the surface A2 close to the substrate 110. This helps to reduce the light reflectivity of the display substrate, improve device readability in strong light environments, and the higher surface roughness also helps to improve surface adhesion and reduce the risk of interlayer delamination.

[0115] For example, in Figure 17In the embodiment, the average thickness L2 of the first edge portion 3142 and the average thickness L3 of the second edge portion 3143 are both less than the average thickness L1 of the middle portion 3141. At this time, the cross-section of the first light-shielding portion 314 is convex in shape.

[0116] For example, such as Figure 16 As shown, the multiple sub-pixels also include a third sub-pixel SP3, which includes a third light-emitting device E3. The light-shielding pattern 310 also includes a third sub-opening 313. In a direction perpendicular to the substrate 110, the third sub-opening 313 exposes the third light-emitting device E3 to emit light emitted by the third light-emitting device E3. The multiple color filter patterns also include a third color filter pattern 323, which is at least disposed in the third sub-opening 313 and configured to transmit light emitted by the third light-emitting device E3. For example, the third light-emitting device E3 is configured to emit light of a third color, and the third color filter pattern 323 is configured to transmit light of the third color. For example, the setting of the light-shielding portion between any two adjacent sub-pixels is the same as the setting of the first light-shielding portion 314, thereby achieving essentially the same technical effect.

[0117] For example, in some other embodiments, Figure 18 and Figure 19 The following are partial cross-sectional schematic diagrams of different display substrates provided in the embodiments of this disclosure. Figure 20 It shows Figure 18 A cross-sectional schematic diagram of the first light-shielding portion of the display substrate. Figure 21 It shows Figure 19 A cross-sectional schematic diagram of the first light-shielding portion of the display substrate.

[0118] like Figure 18 and Figure 20 As shown, the average thickness L2 of the first edge portion 3142 and the average thickness L3 of the second edge portion 3143 are both less than the average thickness L1 of the middle portion 3141, and the cross-section of the first light-shielding portion 314 is approximately trapezoidal. In this case, the thicknesses of the first edge portion 3142 and the second edge portion 3143 are gradually changing (e.g., linear or non-linear). The average thickness L2 of the first edge portion 3142 can be the thickness of the gradually changing portion at the midpoint M1, and the average thickness L3 of the second edge portion 3143 can be the thickness of the gradually changing portion at the midpoint M2.

[0119] For example, in Figure 20 In the example, the cross-sectional edges of the first edge portion 3142 and the second edge portion 3143 are linear. In other examples, the cross-sectional edges of the first edge portion 3142 and the second edge portion 3143 may also be curved or polygonal.

[0120] like Figure 19 and Figure 21 As shown, the average thickness L2 of the first edge portion 3142 and the average thickness L3 of the second edge portion 3143 are both less than the average thickness L1 of the middle portion 3141, and the cross-section of the first light-shielding portion 314 is roughly triangular. Similarly, the thicknesses of the first edge portion 3142 and the second edge portion 3143 are gradually changing. The average thickness L2 of the first edge portion 3142 can be the thickness of the gradually changing portion at the midpoint M1, and the average thickness L3 of the second edge portion 3143 can be the thickness of the gradually changing portion at the midpoint M2. The middle portion 3141 is generally linear.

[0121] For example, in Figure 21 In the example, the cross-sectional edges of the first edge portion 3142 and the second edge portion 3143 are linear. In other examples, the cross-sectional edges of the first edge portion 3142 and the second edge portion 3143 may also be curved or polygonal.

[0122] In the above embodiment, the first edge portion 3142 and the second edge portion 3143 are formed by a thinning process, such that the roughness of the surface A1 of the first edge portion 3142 and the second edge portion 3143 away from the substrate 110 is greater than the roughness of the surface A2 close to the substrate 110. This helps to reduce the light reflectivity of the display substrate, improve device readability in strong light environments, and the higher surface roughness also helps to improve surface adhesion and reduce the risk of interlayer peeling.

[0123] For example, for the aforementioned edge portion with varying thickness, the transmittance of the photomask can be adjusted during the fabrication process. For instance, when the material of the black matrix is ​​a negative photoresist, the transmittance of the photomask corresponding to the first light-shielding portion 314 can be set to gradually decrease from the middle to the edge. For example, slits can be opened on the photomask, with wider slits at locations with high transmittance and narrower slits at locations with low transmittance. This results in different degrees of exposure for the first edge portion 3142 and the second edge portion 3143 at different locations, thereby forming an edge portion with varying thickness.

[0124] For example, compared to Figure 17 Implementation examples, Figure 20 and Figure 21 The embodiments can also design the slope angle of the first edge portion 3142 and the second edge portion 3143 to adjust the light emission angle of different sub-pixels and improve brightness attenuation issues.

[0125] For example, when multiple sub-openings in the light-shielding pattern 310 emit light from the light-emitting device, the emissivity is highest for light emitted perpendicularly (that is, light emitted perpendicularly to the substrate 110). The larger the angle between the light and the vertical direction, the lower the emissivity. This phenomenon is called brightness attenuation. In actual use of the display substrate, users often do not view the display perpendicularly, which reduces the display brightness (compared to viewing perpendicularly). In some embodiments, the brightness attenuation problem can be improved by designing the slope angle of the first edge portion 3142 and the second edge portion 3143, thereby improving the viewing effect when the user does not view perpendicularly.

[0126] For example, in some embodiments, reference Figure 21 The slope angle of the first edge portion 3142 is 'a', and the slope angle of the second edge portion 3143 is 'b'. Slope angles 'a' and 'b' can be greater than 5 degrees and less than or equal to 45 degrees, for example, 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, or 45 degrees. Slope angles 'a' and 'b' can be the same or different.

[0127] Therefore, in addition to ensuring that the light-shielding pattern 310 blocks the touch layer 200 and stray light, the above design can minimize the blocking of outgoing light and improve the brightness attenuation problem; at the same time, the reflectivity of the light-shielding pattern 310 is also reduced, improving the readability of the device in strong light environments.

[0128] Through testing, when the slope angle α of the first edge portion 3142 or the slope angle b of the second edge portion 3143 is ≤ 45°, the light-blocking pattern 310 significantly improves the brightness attenuation in the direction with an angle of 45° to the vertical direction. When the slope angle α of the first edge portion 3142 or the slope angle b of the second edge portion 3143 is ≤ 30°, the light-blocking pattern 310 improves the brightness attenuation in the direction with an angle of 30° to the vertical direction, for example, the brightness attenuation in this direction is less than 30% of the brightness in the vertical direction.

[0129] For example, in some embodiments, the slope angle of the light-shielding portion at the sub-opening corresponding to multiple sub-pixels with different emission colors can be designed to adjust the light emission effect of multiple sub-pixels with different emission colors.

[0130] For example, such as Figure 19As shown, the slope angle of the edge portion of the light-blocking part at the first sub-opening 311 corresponding to the first sub-pixel SP1 is a1, the slope angle of the edge portion of the light-blocking part at the second sub-opening 312 corresponding to the second sub-pixel SP2 is b1, and the slope angle of the edge portion of the light-blocking part at the third sub-opening 313 corresponding to the third sub-pixel SP3 is c1. At least two of the slope angles a1, b1, and c1 have different values. For example, any two of the slope angles a1, b1, and c1 have different values.

[0131] For example, in some examples, the first sub-pixel SP1 is a red sub-pixel. When the slope angle a1 is designed to be small, the emission angle of red light is larger, resulting in higher brightness. The second sub-pixel SP2 is a green sub-pixel. When the slope angle b1 is designed to be small, the emission angle of green light is larger, resulting in higher brightness. The third sub-pixel SP3 is a blue sub-pixel. When the slope angle c1 is designed to be small, the emission angle of blue light is larger, resulting in higher brightness. Therefore, different slope angles corresponding to different color sub-pixels can be designed for different display needs to adjust the degree of brightness attenuation of different color sub-pixels, thereby improving the viewing angle distortion phenomenon under different viewing angles and enhancing the display effect of the display substrate.

[0132] For example, in other embodiments, the first sub-pixel SP1 can also be a green sub-pixel, the second sub-pixel SP2 can also be a red sub-pixel, and the third sub-pixel SP3 can also be a blue sub-pixel; or, the first sub-pixel SP1 can be a red sub-pixel, the second sub-pixel SP2 can be a blue sub-pixel, and the third sub-pixel SP3 can be a green sub-pixel; or, the first sub-pixel SP1 can be a red sub-pixel, the second sub-pixel SP2 can be a green sub-pixel, and the third sub-pixel SP3 can be a blue sub-pixel; or, the first sub-pixel SP1 can be a blue sub-pixel, the second sub-pixel SP2 can be a green sub-pixel, and the third sub-pixel SP3 can be a red sub-pixel; or, the first sub-pixel SP1 can be a blue sub-pixel, the second sub-pixel SP2 can be a red sub-pixel, and the third sub-pixel SP3 can be a green sub-pixel, and so on. For example, the color configuration of the above multiple sub-pixels can be applied to the above Figure 1- Figure 21 Any embodiment of the present disclosure. The embodiments of this disclosure do not specifically limit the color configuration of the multiple sub-pixels.

[0133] For example, in Figure 1- Figure 21 In the embodiments described, the touch layer 200 may include a third insulating layer 205, which is disposed on the side of the second conductive layer 204 away from the substrate 110. In this case, the first color filter sublayer 301 may be formed on the side of the third insulating layer 205 away from the substrate 110. For details, please refer to [reference needed]. Figure 4 Examples of implementations.

[0134] At least one embodiment of this disclosure also provides a display substrate. Figure 22 A partial cross-sectional schematic diagram of the display substrate is shown, as follows: Figure 22 As shown, the display substrate includes an array substrate 100 and a color filter layer 300, among other structures.

[0135] like Figure 22 As shown, the array substrate 100 includes a substrate 110 and a plurality of sub-pixels disposed on the substrate 110, for example... Figure 22 The diagram shows a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3 as examples; each of the plurality of sub-pixels includes a light-emitting device, for example, the first sub-pixel SP1 includes a first light-emitting device E1, and also includes a driving circuit (not shown in the figure) for driving the first light-emitting device E1, the second sub-pixel SP2 includes a second light-emitting device E2, and also includes a driving circuit (not shown in the figure) for driving the second light-emitting device E2, and the third sub-pixel SP3 includes a third light-emitting device E3, and also includes a driving circuit (not shown in the figure) for driving the third light-emitting device E3.

[0136] The color filter layer 300 includes a light-shielding pattern 310 and a plurality of color filter patterns; the light-shielding pattern 310 includes a plurality of first openings, for example, the plurality of first openings include a first sub-opening 311 corresponding to a first sub-pixel SP1, a second sub-opening 312 corresponding to a second sub-pixel SP2, and a third sub-opening 313 corresponding to a third sub-pixel SP3, etc.

[0137] In a direction perpendicular to the substrate 110, a plurality of first openings expose the light-emitting devices of a plurality of sub-pixels. For example, the first sub-opening 311 exposes the first light-emitting device E1 of the first sub-pixel SP1 to emit light emitted by the first light-emitting device E1; the second sub-opening 312 exposes the second light-emitting device E2 of the second sub-pixel SP2 to emit light emitted by the second light-emitting device E2; and the third sub-opening 313 exposes the third light-emitting device E3 of the third sub-pixel SP3 to emit light emitted by the third light-emitting device E3.

[0138] Multiple color filter patterns are respectively disposed in at least a plurality of first openings and configured to transmit light emitted by the light-emitting devices of multiple sub-pixels. For example, the multiple color filter patterns include a first color filter pattern 321, a second color filter pattern 322, and a third color filter pattern 323. The first color filter pattern 321 is located at least in a first sub-opening 311 and is configured to transmit light emitted by a first light-emitting device E1. The second color filter pattern 322 is located at least in a second sub-opening 312 and is configured to transmit light emitted by a second light-emitting device E2. The third color filter pattern 323 is located at least in a third sub-opening 313 and is configured to transmit light emitted by a third light-emitting device E3.

[0139] For example, in some examples, the first sub-pixel SP1 is configured to emit light of a first color, the first color filter pattern 321 is configured to transmit light of the first color, the second sub-pixel SP2 is configured to emit light of a second color, the second color filter pattern 322 is configured to transmit light of the second color, the third sub-pixel SP3 is configured to emit light of a third color, and the third color filter pattern 323 is configured to transmit light of the third color, thereby making the emitted color of each sub-pixel purer.

[0140] like Figure 22 As shown, the roughness of at least a portion of the surface of the color filter layer 300 that is away from the substrate 110 is greater than the roughness of the surface that is close to the substrate 110.

[0141] A rougher surface helps reduce the light reflectivity of the display substrate, improves device readability in bright light environments, and also helps improve surface adhesion, reducing the risk of film layer peeling.

[0142] For example, such as Figure 22 As shown, at least a portion of the color filter layer 300 (i.e., the portion of the surface roughness away from the substrate 110 and close to the surface roughness of the substrate 110) includes at least a portion of a plurality of color filter patterns, such as at least one of a first color filter pattern 321, a second color filter pattern 322, and a third color filter pattern 323; and / or, at least a portion of the color filter layer 300 (i.e., the portion of the surface roughness away from the substrate 110 and close to the surface roughness of the substrate 110) includes at least a portion of a light-shielding pattern 310.

[0143] That is, in the embodiments of this disclosure, at least a portion of the multiple color filter patterns may be configured such that the surface roughness away from the substrate 110 is close to the surface roughness of the substrate 110; or, at least a portion of the light-shielding pattern 310 may be configured such that the surface roughness away from the substrate 110 is close to the surface roughness of the substrate 110; or, at least a portion of the multiple color filter patterns and at least a portion of the light-shielding pattern 310 may both be configured such that the surface roughness away from the substrate 110 is close to the surface roughness of the substrate 110. For example, the light-shielding pattern 310 may be formed using a black matrix or by an overlapping structure of multiple color filter sublayers.

[0144] In embodiments of this disclosure, the “roughness” of a surface refers to the unevenness of the surface, characterized by small pitches and minute peaks and valleys. The smaller the roughness, the smoother the surface.

[0145] For example, in some embodiments, the surface roughness of at least one of the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323 that is away from the substrate 110 is greater than the surface roughness that is near the substrate 110.

[0146] For example, the surface roughness of any one of the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323, away from the substrate 110, is greater than the surface roughness of the surface near the substrate 110; or, the surface roughness of any two of the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323, away from the substrate 110, is greater than the surface roughness of the surface near the substrate 110; or, the surface roughness of each of the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323, away from the substrate 110, is greater than the surface roughness of the surface near the substrate 110, that is... Figure 22 The situation shown.

[0147] For example, Figure 23 It shows Figure 22 A cross-sectional schematic diagram of the color filter layer of the display substrate, as shown in the figure. Figure 23 As shown, the surface roughness 321A of the first color filter pattern 321, which is away from the substrate 110, is greater than the surface roughness 321B, which is close to the substrate 110; the surface roughness 322A of the second color filter pattern 322, which is away from the substrate 110, is greater than the surface roughness 322B, which is close to the substrate 110; and the surface roughness 323A of the third color filter pattern 323, which is away from the substrate 110, is greater than the surface roughness 323B, which is close to the substrate 110.

[0148] For example, in some examples, the first sub-pixel SP1 is a red sub-pixel with red as the first color, the second sub-pixel SP2 is a green sub-pixel with green as the second color, and the third sub-pixel SP3 is a blue sub-pixel with blue as the third color; or, the first sub-pixel SP1 is a green sub-pixel with green as the first color, the second sub-pixel SP2 is a red sub-pixel with red as the second color, and the third sub-pixel SP3 is a blue sub-pixel with blue as the third color; or, the first sub-pixel SP1 is a red sub-pixel with red as the first color, the second sub-pixel SP2 is a blue sub-pixel with blue as the second color, and the third sub-pixel SP3 is a green sub-pixel with green as the third color, and so on. The embodiments of this disclosure do not specifically limit the color configuration of multiple sub-pixels.

[0149] Therefore, the color filter patterns corresponding to multiple sub-pixels with different emission colors are all set such that the surface roughness away from the substrate 110 is greater than the surface roughness near the substrate 110. This reduces the overall light reflectivity of the display substrate, improves device readability in strong light environments, and the higher surface roughness also helps to improve surface adhesion and reduce the risk of film layer peeling.

[0150] For example, in some embodiments, such as Figure 23As shown, at least one of the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323 includes an overlapping portion, which is located on the side of the light-shielding pattern 310 away from the substrate 110; for example, the first color filter pattern 321 includes an overlapping portion P1, the second color filter pattern 322 includes an overlapping portion P2, and the third color filter pattern 323 includes an overlapping portion P3, with the overlapping portions P1-P3 all located on the side of the light-shielding pattern 310 away from the substrate 110; for example, the thickness of the overlapping portions P1-P3 is 0.1μm-1.2μm, for example, 0 The thickness can be 0.1μm, 0.2μm, 0.3μm, 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, 1.0μm, 1.1μm, or 1.2μm, etc. This thickness is relatively small, for example, much smaller than the thickness of the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323 located in the first opening. As a result, the surfaces of the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323 away from the substrate are flatter, for example, without depressions, which helps to improve defects such as color shift.

[0151] For example, such as Figure 24 As shown, the display substrate may further include a touch layer 200 disposed on the array substrate 100. The touch layer 200 includes a first insulating layer 201, a first conductive layer 202, a second insulating layer 203, and a second conductive layer 204. The specific forms of the first insulating layer 201, the first conductive layer 202, the second insulating layer 203, and the second conductive layer 204 can be referred to the above embodiments. For example, in... Figure 24 In some embodiments, the touch layer 200 may also include a third insulating layer 205, which is disposed on the side of the second conductive layer 204 away from the substrate 110. In this case, the light-shielding layer 300 may be formed on the side of the third insulating layer 205 away from the substrate 110. For details, please refer to [reference needed]. Figure 4 Examples of implementations.

[0152] For example, during the fabrication of the display substrate, the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323 can be formed by a thinning process so that the overlapping portion P1-P3 reaches the aforementioned thinner thickness and the surfaces of the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323 away from the substrate are flatter.

[0153] For example, Figure 24 It shows Figure 22 A cross-sectional schematic diagram of the display substrate during the manufacturing process, as shown in the figure. Figure 24As shown, after the array substrate 100, touch layer 200, and light-shielding pattern 310 are prepared, material 3010 of the first color filter sub-layer 301 is formed on the light-shielding pattern 310 by coating or other methods. For example, material 3010 can be a photoresist material, which can be a positive photoresist or a negative photoresist. The embodiments disclosed herein do not specifically limit this. In this embodiment, a negative photoresist material is used as an example for description, and other cases can be referred to accordingly.

[0154] For example, such as Figure 23 As shown, a halftone mask 400 is provided, including a first light-transmitting portion 401 and a non-light-transmitting portion 402. The non-light-transmitting portion 402 is opaque, meaning its transmittance is 0%, corresponding to the area where the material needs to be completely removed. The first light-transmitting portion 401 has low transmittance, for example, 20%-50%, corresponding to the area where the material needs to be partially removed. For example, the first light-transmitting portion 401 corresponds to the position where the first sub-opening 311 needs to overlap with the light-blocking pattern, and the non-light-transmitting portion 402 corresponds to the remaining positions. After the material 3010 is exposed through the mask 400, the material 3010 is developed, thereby partially removing the portion of the material 3010 corresponding to the first light-transmitting portion 401, thus reducing the thickness and forming a thinner first color film pattern 321. The portion of the material 3010 corresponding to the non-light-transmitting portion 402 is completely removed.

[0155] In the above embodiments, since the first color filter pattern 321 is thinned by an etching process (e.g., a developing process), the roughness of the surface 301A of the first color filter pattern 321 away from the substrate 110 is greater than the roughness of the surface 301B close to the substrate 110. Furthermore, the removal of some material from the surface of the first color filter pattern 321 away from the substrate can improve the flatness of this surface, enhance the uniformity of the first color filter pattern 321, and mitigate defects such as color shift.

[0156] Similarly, the second color filter pattern 322 and the third color filter pattern 323 can also be formed using the same process as the first color filter pattern 321, so that they have a structure that is basically the same as the first color filter pattern 321 and can achieve a technical effect that is basically the same, which will not be elaborated here.

[0157] For example, in some examples, in Figure 23Under the fabrication process, the thickness of the color filter pattern above the light-shielding pattern 310 (e.g., the thickness of the overlapping portion P1-P3) can be between 0 and 1.3 μm, for example, between 0.1 μm and 1.2 μm, for example, between 0.3 μm and 1.0 μm, for example, between 0.5 μm and 0.8 μm. The thickness of the portion of the first color filter pattern 321, the second color filter pattern 322, and the third color filter pattern 323 located in the first opening can be about 2 μm to 5 μm, for example, between 2 μm and 4 μm, for example, between 2 μm and 3 μm.

[0158] It can be seen that, in Figure 23 In the preparation method, the coating thickness of material 3010 can be set to be very thick, for example, much thicker than the coating limit of the equipment. Then, by adjusting the light transmittance of the first light-transmitting portion 401, part of the thickness is removed, making the thickness of the color filter pattern above the light-shielding pattern 310 (e.g., the thickness of the overlapping portion P1-P3) adjustable and not limited by the equipment limit. For example, in conventional processes, when the thickness of material 3010 is thin, due to the reflow phenomenon, the thickness of material 3010 in the first opening differs significantly from the thickness of material 3010 on the light-shielding pattern 310. Without further improving the equipment's precision, the thickness of material 3010 in the first opening cannot be further reduced, which is detrimental to the thinning of the display substrate and subsequent color filter layer processes. However, Figure 23 The preparation method is not limited by the equipment process limits, and can significantly reduce the thickness of the color filter pattern, improve the surface roughness, and improve the uniformity and flatness of the color filter pattern, thereby improving defects such as color deviation of the display substrate.

[0159] For example, in Figure 22 In some embodiments, the light-shielding pattern 310 includes a black matrix; in other embodiments, the light-shielding pattern 310 may also be formed by overlapping multiple color film sublayers.

[0160] For example, in some embodiments, reference Figures 1A-15 The color filter layer 300 includes a first color filter sublayer 301 and a second color filter sublayer 302 disposed on the side of the first color filter sublayer 301 away from the substrate 110. The first color filter sublayer 301 includes a first color filter pattern 321, and the second color filter sublayer 302 includes a second color filter pattern 322. The first color filter sublayer 301 and the second color filter sublayer 302 overlap to form a light-shielding pattern 310. The surface roughness of at least a portion of the first color filter sublayer 301 (e.g., the first color filter sublayer 301 in the first light-shielding portion 314) away from the substrate 110 is greater than the surface roughness of the surface close to the substrate 110.

[0161] For example, in some embodiments, such as Figure 5 and Figure 7As shown, the surface roughness of at least a portion of the third color filter sublayer 303 (e.g., the third color filter pattern 323) away from the substrate 110 is greater than the surface roughness of the surface near the substrate 110.

[0162] For example, in some embodiments, such as Figure 7 As shown, the surface roughness of at least a portion of the second color filter sublayer 302 (e.g., the second color filter pattern 322) away from the substrate 110 is greater than the surface roughness of the surface near the substrate 110.

[0163] Therefore, these rougher surfaces help reduce the light reflectivity of the display substrate, improve device readability in strong light environments, and also help improve surface adhesion and reduce the risk of film layer peeling.

[0164] For example, in some embodiments, such as Figures 16-21 As shown, the light-shielding pattern 310 includes a black matrix, which includes a first light-shielding portion 314 located between two adjacent first openings in a plurality of first openings. The cross-section of the first light-shielding portion 314 includes a middle portion 3141 and a first edge portion 3142 and a second edge portion 3143 located on both sides of the middle portion 3141, respectively. The average thickness of at least one of the first edge portion 3142 and the second edge portion 3143 is less than the average thickness of the middle portion 3141.

[0165] For example, the average thickness of the first edge portion 3142 and the second edge portion 3143 is both less than the average thickness of the middle portion 3141, and the cross-section of the first light-shielding portion 314 is generally stepped (see reference). Figure 16 and Figure 17 ); or the cross-section of the first light-shielding part 314 is triangular in shape (see reference). Figure 19 and Figure 21 ) or trapezoid (see reference) Figure 18 and Figure 20 ).

[0166] Therefore, the surface A1 of the first edge portion 3142 and the second edge portion 3143, which is farther from the substrate 110, has a roughness greater than the surface A2, which is closer to the substrate 110. These surfaces with higher roughness help reduce the light reflectivity of the display substrate, improve device readability in strong light environments, and also help improve surface adhesion and reduce the risk of interlayer delamination.

[0167] related Figures 1A-21 For more technical features and effects of the embodiments, please refer to the above embodiments, which will not be repeated here.

[0168] For example, the various display substrates provided in the embodiments of this disclosure can be organic light-emitting display substrates (including organic light-emitting elements (OLED) or including stacked organic light-emitting elements (Tandom OLED)), quantum dot light-emitting display substrates (including quantum dot organic light-emitting elements QDOLED), light-emitting diode display substrates (LED), micro LED display substrates (including mini-LED or micro-LED), and other various display substrates. The embodiments of this disclosure do not specifically limit them.

[0169] At least one embodiment of this disclosure also provides a display device, which includes the display substrate provided in the embodiments of this disclosure. For example, the display device can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, watch, etc. The embodiments of this disclosure do not limit the specific form of the display device.

[0170] For example, the display device provided in this embodiment has the same technical effect as the display substrate described above, but has a better display effect.

[0171] The following points also need to be explained: (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure, and other structures can be referred to the general design.

[0172] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the present disclosure, i.e., these drawings are not drawn to scale. It will be understood that when an element such as a layer, film, region or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element or there may be intermediate elements.

[0173] (3) Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0174] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. The scope of protection of this disclosure shall be determined by the scope of the claims.

Claims

1. A display substrate, characterized in that, include: An array substrate includes a substrate and a plurality of sub-pixels disposed on the substrate, wherein the plurality of sub-pixels includes adjacent first sub-pixels and second sub-pixels, the first sub-pixels including a first light-emitting device, the second sub-pixels including a second light-emitting device, and... Color filter layer, including: A light-shielding pattern includes a first sub-opening, a second sub-opening, and a first light-shielding portion located between the first sub-opening and the second sub-opening, wherein, in a direction perpendicular to the substrate, the first sub-opening exposes the first light-emitting device, the second sub-opening exposes the second light-emitting device, and... Multiple color filter patterns, including a first color filter pattern and a second color filter pattern, wherein the first color filter pattern is at least disposed in the first sub-opening and configured to transmit light emitted by the first light-emitting device, and the second color filter pattern is at least disposed in the second sub-opening and configured to transmit light emitted by the second light-emitting device. The color filter layer includes a first color filter sublayer and a second color filter sublayer disposed on the side of the first color filter sublayer away from the substrate. The first color filter sublayer includes a first color filter pattern, and the second color filter sublayer includes a second color filter pattern. The first color filter sublayer and the second color filter sublayer overlap to form the first light-shielding portion. In the first light-shielding portion, the thickness of the first color filter sublayer is less than the thickness of the second color filter sublayer.

2. The display substrate according to claim 1, characterized in that, The plurality of sub-pixels also includes a third sub-pixel, the third sub-pixel including a third light-emitting device. The light-shielding pattern further includes a third sub-opening that exposes the third light-emitting device in a direction perpendicular to the substrate. The plurality of color filter patterns also includes a third color filter pattern, which is disposed at least in the third sub-opening and configured to transmit light emitted by the third light-emitting device. The color filter layer further includes a third color filter sublayer disposed between the first color filter sublayer and the second color filter sublayer, the third color filter sublayer including the third color filter pattern. The first color filter sublayer, the second color filter sublayer, and the third color filter sublayer overlap to form the first light-shielding portion, wherein the thickness of the first color filter sublayer is less than the thickness of the third color filter sublayer in the first light-shielding portion.

3. The display substrate according to claim 2, characterized in that, The thickness of the first color filter pattern is equal to the thickness of the first color filter sublayer in the first light-shielding portion.

4. The display substrate according to claim 2, characterized in that, The thickness of the first color filter pattern is greater than the thickness of the first color filter sublayer in the first light-shielding portion.

5. The display substrate according to claim 1 or 2, characterized in that, The plurality of sub-pixels also includes a third sub-pixel, the third sub-pixel including a third light-emitting device. The light-shielding pattern further includes a third sub-opening that exposes the third light-emitting device in a direction perpendicular to the substrate. The plurality of color filter patterns also includes a third color filter pattern, which is disposed at least in the third sub-opening and configured to transmit light emitted by the third light-emitting device. The color filter layer further includes a third color filter sublayer disposed between the first color filter sublayer and the second color filter sublayer, the third color filter sublayer including the third color filter pattern. The first color filter sublayer, the second color filter sublayer, and the third color filter sublayer overlap to form the first light-shielding portion, wherein the thickness of the third color filter sublayer is less than the thickness of the second color filter sublayer in the first light-shielding portion.

6. The display substrate according to claim 1 or 2, characterized in that, The plurality of sub-pixels also includes a third sub-pixel, the third sub-pixel including a third light-emitting device. The light-shielding pattern further includes a third sub-opening that exposes the third light-emitting device in a direction perpendicular to the substrate. The plurality of color filter patterns also includes a third color filter pattern, which is disposed at least in the third sub-opening and configured to transmit light emitted by the third light-emitting device. The color filter layer further includes a third color filter sublayer disposed between the first color filter sublayer and the second color filter sublayer, the third color filter sublayer including the third color filter pattern. The first color filter sublayer, the second color filter sublayer, and the third color filter sublayer overlap to form the first light-shielding portion, and the thickness of the first color filter pattern is greater than or equal to the sum of the thicknesses of the first color filter sublayer and the third color filter sublayer in the first light-shielding portion.

7. The display substrate according to any one of claims 1-4, characterized in that, The thickness of the first color filter sublayer in the first light-shielding portion is 0.4μm-1.1μm.

8. A display substrate, characterized in that, include: An array substrate includes a substrate and a plurality of sub-pixels disposed on the substrate, wherein the plurality of sub-pixels includes adjacent first sub-pixels and second sub-pixels, the first sub-pixels including a first light-emitting device, the second sub-pixels including a second light-emitting device, and... Color filter layer, including: A light-shielding pattern includes a first sub-opening, a second sub-opening, and a first light-shielding portion located between the first sub-opening and the second sub-opening, wherein, in a direction perpendicular to the substrate, the first sub-opening exposes the first light-emitting device, the second sub-opening exposes the second light-emitting device, and... Multiple color filter patterns, including a first color filter pattern and a second color filter pattern, wherein the first color filter pattern is at least disposed in the first sub-opening and configured to transmit light emitted by the first light-emitting device, and the second color filter pattern is at least disposed in the second sub-opening and configured to transmit light emitted by the second light-emitting device. The light-shielding pattern includes a black matrix, and the cross-section of the first light-shielding portion includes a middle portion and a first edge portion and a second edge portion located on both sides of the middle portion, respectively. The average thickness of at least one of the first edge portion and the second edge portion is less than the average thickness of the middle portion.

9. The display substrate according to claim 8, characterized in that, The average thickness of the first edge portion is less than the average thickness of the middle portion, and the cross-sections of the first edge portion and the middle portion are generally stepped.

10. The display substrate according to claim 8, characterized in that, The average thickness of the first edge portion and the second edge portion is less than the average thickness of the middle portion, and the cross-section of the first light-shielding portion is convex in shape.

11. The display substrate according to claim 8, characterized in that, The average thickness of the first edge portion and the second edge portion is less than the average thickness of the middle portion, and the cross-section of the first light-shielding portion is generally triangular or trapezoidal.

12. A display substrate, characterized in that, include: An array substrate includes a substrate and a plurality of sub-pixels disposed on the substrate, wherein each of the plurality of sub-pixels includes a light-emitting device, and Color filter layer, including: A light-shielding pattern includes a plurality of first openings, wherein, in a direction perpendicular to the substrate, the plurality of first openings expose the light-emitting devices of the plurality of sub-pixels, and Multiple color filter patterns are respectively disposed in at least the multiple first openings, configured to transmit light emitted by the light-emitting devices of the multiple sub-pixels. Wherein, the roughness of at least a portion of the surface of the color filter layer that is away from the substrate is greater than the roughness of at least a portion of the surface that is close to the substrate.

13. The display substrate according to claim 12, characterized in that, At least a portion of the color filter layer includes at least a portion of the plurality of color filter patterns; and / or At least a portion of the color filter layer includes at least a portion of the light-blocking pattern.

14. The display substrate according to claim 12, characterized in that, The plurality of sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein the first sub-pixel is configured to emit light of a first color, the second sub-pixel is configured to emit light of a second color, and the third sub-pixel is configured to emit light of a third color. The plurality of color filter patterns include a first color filter pattern, a second color filter pattern, and a third color filter pattern. The first color filter pattern is configured to transmit light of the first color, the second color filter pattern is configured to transmit light of the second color, and the third color filter pattern is configured to transmit light of the third color. The surface roughness of at least one of the first color filter pattern, the second color filter pattern, and the third color filter pattern that is farther away from the substrate is greater than the surface roughness that is closer to the substrate.

15. The display substrate according to claim 14, characterized in that, At least one of the first color filter pattern, the second color filter pattern, and the third color filter pattern includes an overlapping portion, the overlapping portion being located on the side of the light-shielding pattern away from the substrate, and the thickness of the overlapping portion being 0.1 μm-1.2 μm.

16. The display substrate according to claim 14, characterized in that, The color filter layer includes a first color filter sublayer and a second color filter sublayer disposed on the side of the first color filter sublayer away from the substrate. The first color filter sublayer includes a first color filter pattern, and the second color filter sublayer includes a second color filter pattern. The first color filter sublayer and the second color filter sublayer overlap to form the light-shielding pattern. The surface roughness of at least a portion of the first color filter sublayer, away from the substrate, is greater than the surface roughness of the surface near the substrate.

17. The display substrate according to claim 16, characterized in that, The surface roughness of at least a portion of the second color filter sublayer, away from the substrate, is greater than the surface roughness of the surface near the substrate.

18. The display substrate according to claim 12, characterized in that, The light-shielding pattern includes a black matrix, the black matrix including a first light-shielding portion located between two adjacent first openings among the plurality of first openings. The cross-section of the first light-shielding portion includes a middle portion and a first edge portion and a second edge portion located on both sides of the middle portion, respectively, wherein the average thickness of at least one of the first edge portion and the second edge portion is less than the average thickness of the middle portion.

19. The display substrate according to claim 18, characterized in that, The average thickness of both the first edge portion and the second edge portion is less than the average thickness of the middle portion. The cross-section of the first light-shielding portion is generally stepped; or The cross-section of the first light-shielding part is triangular or trapezoidal.

20. A display device, characterized in that, Includes the display substrate as described in any one of claims 1-19.

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