Display substrate and display screen

Abstract

The embodiment of the invention provides a display substrate and a display screen. The display substrate comprises a back plate, a pixel definition layer, a pixel light-emitting structure, a thin film packaging layer, a black matrix layer, a color filter and a protection layer. The pixel definition layer is located on the backboard, and the pixel light-emitting structure is located in a first opening area of the pixel definition layer; the thin film packaging layer is located on the side, away from the backboard, of the pixel defining layer, the black matrix layer is located on the side, away from the backboard, of the thin film packaging layer, and at least part of the color filter is located in a second opening area of the black matrix layer; the color filter is located on the side, away from the backboard, of the black matrix layer, and the protection layer is located on the side, away from the backboard, of the black matrix layer; the first sub-pixel in the same pixel comprises at least two first sub-pixel light-emitting structures; the first orthographic projection of each first sub-pixel light-emitting structure in the same pixel on the back plate is located in the second orthographic projection of the same second opening area on the back plate. By applying the embodiment of the invention, the color cast problem of the white light viewing angle can be improved.

Description

Technical Field

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

[0002] OLED (Organic Light-Emitting Diode) displays typically employ a method of separately adjusting the microcavity structure of red, green, and blue sub-pixels to regulate the consistency of red, green, and blue light decay with viewing angle, thereby improving viewing angle color shift. However, since the photoluminescence (PL) spectrum of the sub-pixel luminescent materials is fixed, this method has limited ability to improve viewing angle color shift and also affects the display color gamut. Furthermore, adjustments to the substrate thickness and cathode transmittance also influence the luminous performance of the display device.

[0003] COE (Color Filter on Encapsulation) technology replaces traditional polarizers by integrating a CF (Color Filter) onto the encapsulation layer. This reduces the thickness of the display substrate, improves light transmittance and color gamut, and optimizes display performance. In COE display products, the boundaries of the CF are controlled by openings in the BM (Black Matrix) layer. Related technologies include... Figure 1 As shown, the BM layer opening adopts an equal-distance CF design, that is, in the top view of the display substrate, the distance between the edge of the light-emitting material of each sub-pixel and the edge of the opening of the BM layer is equal. Among them, the R (red) sub-pixel, B (blue) sub-pixel and G (green) sub-pixel have different sizes. However, with this structure, there will be a color shift problem when viewing the display device from the side. Summary of the Invention

[0004] The purpose of this application is to provide a display substrate and a display screen to improve the color shift problem of white light viewing angle when viewed from the side. The specific technical solution is as follows:

[0005] In a first aspect, embodiments of this application provide a display substrate, the display substrate comprising:

[0006] Backplane, pixel definition layer, pixel light emission structure, thin film encapsulation layer, black matrix layer, color filter and protective layer;

[0007] The pixel definition layer is located on the backplane, and the pixel definition layer includes a plurality of first opening regions, with the pixel light-emitting structure located in the first opening regions; the thin film encapsulation layer is located on the side of the pixel definition layer away from the backplane, the black matrix layer is located on the side of the thin film encapsulation layer away from the backplane, the black matrix layer includes a plurality of second opening regions, with at least a portion of the color filters located in the second opening regions; the color filters are located on the side of the black matrix layer away from the backplane, and the protective layer is located on the side of the black matrix layer and the color filters away from the backplane;

[0008] The pixel light-emitting structure includes a first sub-pixel light-emitting structure, which is the light-emitting structure of the first sub-pixel in the pixel. The first sub-pixel in the same pixel includes at least two first sub-pixel light-emitting structures. The first orthographic projection of each first sub-pixel light-emitting structure in the same pixel on the back plate is located within the second orthographic projection of the same second opening region on the back plate.

[0009] In one possible implementation, the first sub-pixel in the same pixel includes two first sub-pixel light-emitting structures, and the second orthographic projection is elliptical.

[0010] In one possible implementation, the shape of the orthographic projection of the first sub-pixel light-emitting structure on the back plate is: half is a semicircle and the other half is a semi-ellipse; the semi-elliptical portions of two first sub-pixel light-emitting structures in the same pixel are adjacent.

[0011] In one possible implementation, the pixel light-emitting structure includes a second sub-pixel light-emitting structure and a third sub-pixel light-emitting structure, wherein the second sub-pixel light-emitting structure is the light-emitting structure of the second sub-pixel in the pixel, and the third sub-pixel light-emitting structure is the light-emitting structure of the third sub-pixel in the pixel.

[0012] In one possible implementation, the third orthographic projection of the second sub-pixel light-emitting structure on the back plate is circular, and the fourth orthographic projection of the third sub-pixel light-emitting structure on the back plate is circular.

[0013] In one possible implementation, the orthographic projection of at least one of the second sub-pixel light-emitting structures and the third sub-pixel light-emitting structure onto the back plate is: half is a semicircle and the other half is a semi-ellipse.

[0014] In one possible implementation, the first sub-pixel is a blue sub-pixel.

[0015] In one possible implementation, the display substrate further includes a touch layer located between the thin-film encapsulation layer and the black matrix layer.

[0016] In one possible implementation, the thin-film encapsulation layer includes:

[0017] First inorganic encapsulation layer, organic encapsulation layer and second inorganic encapsulation layer;

[0018] The first inorganic encapsulation layer is located on the side of the pixel definition layer away from the backplane, the organic encapsulation layer is located on the side of the first inorganic encapsulation layer away from the backplane, and the second inorganic encapsulation layer is located on the side of the organic encapsulation layer away from the backplane.

[0019] Secondly, embodiments of this application provide a display screen, the display screen including any of the display substrates described in the first aspect.

[0020] Thirdly, embodiments of this application provide a display device, which includes the display screen described in the second aspect.

[0021] Beneficial effects of the embodiments in this application:

[0022] This application provides a display substrate and a display screen. The display substrate includes a backplane, a pixel definition layer, a pixel light-emitting structure, a thin film encapsulation layer, a black matrix layer, a color filter, and a protective layer. The pixel definition layer is located on the backplane and includes multiple first opening regions, with the pixel light-emitting structure located in each of the first opening regions. The thin film encapsulation layer is located on the side of the pixel definition layer away from the backplane, and the black matrix layer is located on the side of the thin film encapsulation layer away from the backplane. The black matrix layer includes multiple second opening regions, with at least a portion of the color filter located in each of the second opening regions. The color filter is located on the side of the black matrix layer away from the backplane, and the protective layer is located on the side of the black matrix layer away from the backplane. The pixel light-emitting structure includes a first sub-pixel light-emitting structure, which is the light-emitting structure of the first sub-pixel in a pixel. The first sub-pixel in the same pixel includes at least two first sub-pixel light-emitting structures. The first orthographic projection of each first sub-pixel light-emitting structure in the same pixel on the backplane is located within the second orthographic projection of the same second opening region on the backplane.

[0023] In the display substrate provided in this application embodiment, the first sub-pixel in the same pixel includes at least two first sub-pixel light-emitting structures, and the first orthographic projection of each first sub-pixel light-emitting structure in the same pixel on the back plate is located within the second orthographic projection of the same second opening area in the black matrix layer on the back plate. That is, each first sub-pixel light-emitting structure in the same first sub-pixel is located below the same opening area of ​​the black matrix layer, which can reduce the influence of the black matrix layer on the light emission of the first sub-pixel, and can slow down the attenuation of the light emission of each first sub-pixel light-emitting structure in the first sub-pixel with the change of viewing angle, thereby improving the color shift problem of white light viewing angle when viewed from the side.

[0024] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0026] Figure 1 This is a top view schematic diagram of a display substrate in related technologies;

[0027] Figure 2a This is a top view schematic diagram of a display substrate in related technologies;

[0028] Figure 2b for Figure 2a The diagram shows a white CIE1931 trajectory of the display substrate.

[0029] Figure 3 A cross-sectional structural schematic diagram of the first type of display substrate provided in the embodiments of this application;

[0030] Figure 4 A top view schematic diagram of the first sub-pixel light-emitting structure provided in an embodiment of this application;

[0031] Figure 5a A top-view schematic diagram showing different first sub-pixel light-emitting structures covering different second opening regions;

[0032] Figure 5b for Figure 5a The diagram shows a white CIE1931 trajectory of the display substrate.

[0033] Figure 5c A top view schematic diagram of a first type of display substrate provided in an embodiment of this application;

[0034] Figure 5d for Figure 5c The diagram shows a white CIE1931 trajectory of the display substrate.

[0035] Figure 6 A top view schematic diagram of a second type of display substrate provided in an embodiment of this application;

[0036] Figure 7 A top view schematic diagram of a third type of display substrate provided in an embodiment of this application;

[0037] Figure 8 A cross-sectional structural diagram of a second type of display substrate provided in an embodiment of this application;

[0038] Figure 9 This is a cross-sectional structural diagram of a third type of display substrate provided in an embodiment of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 10-Backplate; 20-Pixel definition layer; 30-Pixel light-emitting structure; 40-Thin film encapsulation layer; 41-First inorganic encapsulation layer; 42-Organic encapsulation layer; 43-Second inorganic encapsulation layer; 50-Black matrix layer; 51-Second opening area; 60-Color filter; 70-Protective layer; 80-Touch layer; 90-Glass cover. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0042] With the continuous development of display technology, COE technology replaces traditional polarizers by integrating CF (Color filter) on the encapsulation layer, which can reduce the film thickness of the display substrate, improve light transmittance and display color gamut, and optimize display performance.

[0043] A top view of a display device using COE technology in related technologies is shown below. Figure 2a As shown, the opening of the BM layer adopts a CF design with equal side spacing, and its white light CIE1931 trajectory diagram is as follows. Figure 2b As shown. However, using Figure 2a The structure shown exhibits a yellowish tint to the pixels due to the low luminous efficiency of the blue sub-pixels in the display device and the weak spatial resolution of blue light by the human retina. To address this issue, related technologies increase the brightness of the blue sub-pixels by increasing their number. A top view of the display device is shown below. Figure 1 As shown. However, to reduce ambient light reflection and improve contrast, the COE display structure introduces a BM layer in non-pixel areas. This leads to increased luminance decay (L-decay) of sub-pixels as the viewing angle increases. Furthermore, the differentiated design of different sub-pixel shapes and sizes results in varying degrees of L-decay amplification by the BM on different sub-pixels. Figure 1 The structure shown will cause a color shift in the white light viewing angle when viewed from the side, as illustrated in the CIE1931 white light trajectory diagram. Figure 1 As shown, when the viewing angle between the viewer and the display device is large, the color shift of white light is obvious.

[0044] To improve the color shift problem of white light when viewed from the side, this application provides a display substrate and a display screen, which will be described in detail below.

[0045] A first aspect of the embodiments of this application provides a display substrate, see [link to previous document]. Figure 3 This is a cross-sectional structural diagram of a first type of display substrate provided in an embodiment of this application. The display substrate includes:

[0046] Backplate 10, pixel definition layer 20, pixel light emission structure 30, thin film encapsulation layer 40, black matrix layer 50, color filter 60 and protective layer 70;

[0047] The pixel definition layer 20 is located on the backplate 10, and the pixel definition layer 20 includes a plurality of first opening regions, with the pixel light-emitting structure 30 located in the first opening regions; the thin film encapsulation layer 40 is located on the side of the pixel definition layer 20 away from the backplate 10, the black matrix layer 50 is located on the side of the thin film encapsulation layer 40 away from the backplate 10, the black matrix layer 50 includes a plurality of second opening regions, with at least a portion of the color filter 60 located in the second opening regions; the color filter 60 is located on the side of the black matrix layer 50 away from the backplate 10, and the protective layer 70 is located on the side of the black matrix layer 50 and the color filter 60 away from the backplate 10;

[0048] The pixel light-emitting structure 30 includes a first sub-pixel light-emitting structure, which is the light-emitting structure of the first sub-pixel in the pixel. The first sub-pixel in the same pixel includes at least two first sub-pixel light-emitting structures. The first orthographic projection of each first sub-pixel light-emitting structure in the same pixel on the back plate 10 is located within the second orthographic projection of the same second opening region on the back plate 10.

[0049] In this embodiment of the application, the display substrate can be an OLED display substrate.

[0050] The backplate 10 can be a glass substrate, a silicon substrate, or polyimide (PI), etc. For example, in rigid display substrates, it is usually a glass substrate; while in flexible display substrates, PI film is usually used as the core material, giving the display substrate flexibility and durability to meet the needs of folded or curved displays. The main function of the backplate 10 is to provide a mechanical support platform, support the TFT (Thin Film Transistor) driving circuit, ensure the electrical connection and signal stability of the pixels, and have high light transmittance, heat resistance and mechanical strength to support the entire display substrate structure. At the same time, it provides a stable platform for subsequent processes (such as photolithography, color filter deposition, packaging, etc.). Its specific structure can be found in the prior art, and is not specifically limited in this application.

[0051] The pixel definition layer 20 can be made of black photosensitive polyimide material, which can precisely define the physical boundaries of each sub-pixel within each pixel through photolithography, preventing light emission interference and color mixing between adjacent sub-pixels. At the same time, it can effectively block ambient light reflection and side light leakage, avoid secondary reflection, and thus improve screen contrast and brightness.

[0052] The pixel light-emitting structure 30 is the core functional structure of the display substrate, and its material is usually organic. It is responsible for emitting light under the drive of an electric field. It can be understood that the pixel light-emitting structure 30 includes the light-emitting structures of multiple sub-pixels. Generally, such as... Figure 3 As shown, the light-emitting structure of the sub-pixel includes the light-emitting structure of the R (red) sub-pixel, the light-emitting structure of the G (green) sub-pixel, and the light-emitting structure of the B (blue) sub-pixel.

[0053] The thin-film encapsulation layer 40 can be made of inorganic or organic materials, or it can be a composite structure of inorganic and organic thin films (inorganic / organic stack). The thin-film encapsulation layer 40 encapsulates the pixel light-emitting structure 30, forming a high-barrier barrier that can prevent water and oxygen erosion, thereby reducing the appearance of black spots on the display substrate. Simultaneously, the thin-film encapsulation layer 40 is also the core structure supporting the COE (black matrix layer 50 and color filter 60).

[0054] The black matrix layer 50 and the color filter 60 are important structures constituting the COE. The black matrix layer 50 and the color filter 60, combined, reduce reflectivity by absorbing ambient light. The material of the black matrix layer 50 can be black resin (such as photosensitive polyimide) or chromium (Cr) and its oxide (CrOx), etc.; the material of the color filter 60 can be a low-temperature curing organic photosensitive resin, for example, a photoresist material using a mixture of red (R), green (G), and blue (B) organic pigments or dyes, cured at a low temperature below 100°C, and directly deposited on the thin-film encapsulation layer 40 through a patterning process. By integrating the black matrix layer 50 and the color filter 60 on the thin-film encapsulation layer 40 to replace the traditional polarizer, the overall film thickness of the display substrate can be reduced, light transmittance and display color gamut can be improved, and display performance can be optimized. In the embodiments of this application, as... Figure 3 As shown, the black matrix layer 50 includes a plurality of second opening regions, and at least a portion of the color filter 60 is located in the second opening regions.

[0055] The protective layer 70 is located on the side of the black matrix layer 50 and the color filter 60 away from the backplate 10, and the protective layer 70 is used to protect the color filter 60. In some embodiments, the protective layer 70 may also be referred to as an over cover (OC) layer or a leveling layer.

[0056] In this embodiment of the application, the pixel light-emitting structure 30 includes a first sub-pixel light-emitting structure. The first sub-pixel light-emitting structure is the light-emitting structure of the first sub-pixel in the pixel. The first sub-pixel in the same pixel includes at least two first sub-pixel light-emitting structures. The first orthographic projection of each first sub-pixel light-emitting structure in the same pixel on the back plate 10 is located within the second orthographic projection of the same second opening region on the back plate 10.

[0057] The first sub-pixel can be any sub-pixel within the pixel. For example, if the sub-pixels of the pixel are red, green, and blue, the first sub-pixel is the blue sub-pixel. See also... Figure 5c This is a top view schematic diagram of the first type of display substrate provided in the embodiments of this application. Figure 5c In the image, the first sub-pixel is a blue (B) sub-pixel. The first sub-pixel (B sub-pixel) in the same pixel includes two first sub-pixel light-emitting structures. The orthographic projection of the light-emitting structures of each first sub-pixel (two B sub-pixels) in the same pixel onto the back plate 10 is located within the same second opening region 51 in the black matrix layer 50. The orthographic projections of the light-emitting structures of other sub-pixels (R sub-pixels and G sub-pixels) in the same pixel onto the back plate 10 are located within two different second opening regions 51 in the black matrix layer 50, respectively.

[0058] In some other embodiments, the first sub-pixel may also be a red sub-pixel or a green sub-pixel.

[0059] As can be seen from the above, in the display substrate provided in this application embodiment, the first sub-pixel in the same pixel includes at least two first sub-pixel light-emitting structures, and the first orthographic projection of each first sub-pixel light-emitting structure in the same pixel on the back plate is located within the second orthographic projection of the same second opening area in the black matrix layer on the back plate. The first sub-pixel light-emitting structures in the same first sub-pixel are located below the same opening area of ​​the black matrix layer, which can reduce the influence of the black matrix layer on the light emission of the first sub-pixel, and can slow down the attenuation of the light emission of each first sub-pixel light-emitting structure in the first sub-pixel with the change of viewing angle, thereby improving the color shift problem of white light viewing angle when viewed from the side.

[0060] In one possible implementation, such as Figure 5c As shown, the first sub-pixel in the same pixel includes two first sub-pixel light-emitting structures, and the second orthographic projection is elliptical. In this embodiment, a patterned second opening region 51 can be formed by a photo (patterning) exposure process to adjust the boundary shape of the color filter 60. This process is simple, mature, has low mass production risk, and is highly feasible. In other embodiments, the first sub-pixel in the same pixel may also include three or more first sub-pixel light-emitting structures.

[0061] In one possible implementation, see Figure 4 This is a top view schematic diagram of a first sub-pixel light-emitting structure provided in an embodiment of this application. The shape of the orthographic projection of the first sub-pixel light-emitting structure on the back plate is: half is a semicircle and the other half is a semi-ellipse; the semi-elliptical portions of two first sub-pixel light-emitting structures in the same pixel are adjacent, such as... Figure 5c As shown, Figure 5c The first sub-pixel is a B sub-pixel, and the semi-elliptical portions of the light-emitting structures of two B sub-pixels within the same pixel are adjacent. Compared to a B sub-pixel light-emitting structure where all B sub-pixels have circular light-emitting structures, the semi-elliptical portion of the adjacent portions of two B sub-pixels increases the area of ​​the B sub-pixels while maintaining a fixed distance between the two B sub-pixels (distance between their closest points). Therefore, this structural design increases the area ratio of the first sub-pixel light-emitting structure / second opening region 51, reducing light leakage caused by an excessively small area ratio of the first sub-pixel light-emitting structure / second opening region 51, thereby enhancing the display effect.

[0062] In practical manufacturing, the B subpixel light-emitting structure can be divided into two parts, each subjected to elliptical guidance processing. A BM opening (second opening region) is formed above each of the R and G subpixel light-emitting structures, while a single, unified BM opening is formed above the B subpixel light-emitting structure, covering both segmented B subpixel light-emitting structures. The gridded BM opening (second opening region) is formed by a coating and exposure development process, followed by the filling of a color filter 60, which can be formed using either an Ink (electronic ink) process or a coating process, to fill the gridded BM opening and form a color filter layer. See Table 1 below. Figure 2b , Figure 5b , Figure 5d , Figure 2b for Figure 2a The diagram shown illustrates the CIE (Commission International de l'Eclairage, International Commission on Illumination) 1931 trajectory for the white light on the display substrate. Figure 5b for Figure 5a The diagram shows the white CIE1931 trajectory of the display substrate. Figure 5a To adopt the embodiments of this application Figure 4 The diagram shows the shape of the first sub-pixel light-emitting structure, but different second opening regions cover different first sub-pixel light-emitting structures. (Top view schematic) Figure 5d for Figure 5c The diagram shows the CIE1931 trajectory of white light on the display substrate. CIE1931, based on RGB, uses mathematical methods to select three ideal primary colors to replace the actual three primary colors, thus making the spectral tristimulus values ​​and chromaticity coordinates R, G, and B in the CIE-RGB system positive. The x-coordinate corresponds to the proportion of the red primary color, and the y-coordinate corresponds to the proportion of the green primary color. The dashed ellipses in the diagram represent "3.5, 5, 6," which are JNCD (Just Noticeable Color Difference) values. "R," "L," "U," and "D" represent "right," "left," "top," and "bottom," respectively. The four different line types in the diagram represent the JNCD values ​​viewed from four different directions (right, left, top, and bottom) and different angles (the nodes above the line type represent different angles, increasing from bottom to top, representing 0-90°). Table 1 shows... Figure 2a , Figure 5a , Figure 5cThe comparison of JNCD values ​​of the display substrate at three different angles is shown. JNCD is a core indicator used in display technology to quantify color accuracy, representing the smallest unit of color difference that the human eye can just perceive. The smaller the value, the smaller the screen color difference and the more accurate the color reproduction. It also indicates better color symmetry of the display substrate's L (left) / R (right) / U (top) / D (bottom). (From Table 1 and...) Figure 2b , Figure 5b , Figure 5d The results show that the embodiments of this application Figure 5c The white light color shift trajectory and JNCD value of the display substrate shown are compared to Figure 5a The display substrate shown is much smaller (especially noticeable at larger angles), compared to... Figure 2a The display substrates shown are quite similar. This application describes an embodiment. Figure 5c The display substrate shown can improve the color shift problem when viewing white light.

[0063] Table 1

[0064]

[0065] In another possible implementation, see Figure 6 This is a top view schematic diagram of the second type of display substrate provided in the embodiments of this application, showing two first sub-pixels in the same pixel ( Figure 6 The semi-circular portion of the light-emitting structure (B sub-pixel) is adjacent to each other.

[0066] In one possible implementation, the pixel light-emitting structure includes a second sub-pixel light-emitting structure and a third sub-pixel light-emitting structure, wherein the second sub-pixel light-emitting structure is the light-emitting structure of the second sub-pixel in the pixel, and the third sub-pixel light-emitting structure is the light-emitting structure of the third sub-pixel in the pixel.

[0067] In this embodiment of the application, the pixel light-emitting structure further includes a second sub-pixel light-emitting structure and a third sub-pixel light-emitting structure. The second sub-pixel light-emitting structure is the light-emitting structure of the second sub-pixel in the pixel, and the third sub-pixel light-emitting structure is the light-emitting structure of the third sub-pixel in the pixel. For example Figure 5c As shown, Figure 5c A pixel in a pixel matrix consists of three sub-pixels: the R sub-pixel, the G sub-pixel, and the B sub-pixel. Figure 5c If subpixel B is the first subpixel, then subpixel R is the second subpixel, and subpixel G is the third subpixel; or, subpixel G is the second subpixel, and subpixel R is the third subpixel.

[0068] In one possible implementation, the third orthographic projection of the second sub-pixel light-emitting structure onto the back plate is circular, and the fourth orthographic projection of the third sub-pixel light-emitting structure onto the back plate 10 is circular.

[0069] For example Figure 5c and Figure 6 As shown, the orthographic projections of the second sub-pixel (R sub-pixel or G sub-pixel) light-emitting structure and the third sub-pixel (G sub-pixel or R sub-pixel) light-emitting structure on the back plate 10 are both circles.

[0070] In one possible implementation, the shape of the orthographic projection of at least one of the second sub-pixel light-emitting structures and the third sub-pixel light-emitting structure onto the back plate 10 is: half is a semicircle and the other half is a semi-ellipse.

[0071] In one example, see Figure 7 This is a top view schematic diagram of the third type of display substrate provided in the embodiments of this application. The first sub-pixel (B sub-pixel) has two light-emitting structures, and one of the second sub-pixel (R sub-pixel or G sub-pixel) and third sub-pixel (G sub-pixel or R sub-pixel) light-emitting structures (…). Figure 7 The orthographic projection of the R sub-pixel light-emitting structure onto the backplate 10 is half semi-circular and half semi-elliptical. In other examples, the orthographic projection of the G sub-pixel light-emitting structure onto the backplate 10 may also be half semi-circular and half semi-elliptical, or both the R and G sub-pixel light-emitting structures may have orthographic projections onto the backplate 10 that are half semi-circular and half semi-elliptical.

[0072] In another possible embodiment, the B sub-pixel light-emitting structure (first sub-pixel light-emitting structure) can be divided into multiple blocks, and a small block of the R sub-pixel light-emitting structure, G sub-pixel light-emitting structure, or B sub-pixel light-emitting structure can be subjected to elliptical guidance processing. A BM opening (second opening region) is formed above the R sub-pixel light-emitting structure and the G sub-pixel light-emitting structure, respectively, while a single BM opening is formed above the B sub-pixel light-emitting structure, covering the segmented B sub-pixel light-emitting structures. The gridded BM opening (second opening region) is formed by a coating exposure and development process, and then a color filter 60 is filled in, which can be formed by an Ink process or a coating process, to fill the gridded BM opening and form a color filter layer.

[0073] In another possible embodiment, the R sub-pixel light-emitting structure (first sub-pixel light-emitting structure) can be divided into two or more pieces, and one small piece of the G sub-pixel light-emitting structure, B sub-pixel light-emitting structure, or R sub-pixel light-emitting structure can be subjected to elliptical guidance processing. A BM opening (second opening region) is formed above the G sub-pixel light-emitting structure and the B sub-pixel light-emitting structure, respectively, and a whole BM opening is formed above the R sub-pixel light-emitting structure, covering the divided R sub-pixel light-emitting structure. The gridded BM opening (second opening region) is formed by a coating exposure and development process, and then a color filter 60 is filled in, which can be formed by an Ink process or a coating process, to fill the gridded BM opening and form a color filter layer.

[0074] In another possible embodiment, the G sub-pixel light-emitting structure (first sub-pixel light-emitting structure) can be divided into two or more pieces, and one small piece of the R sub-pixel light-emitting structure, B sub-pixel light-emitting structure, or G sub-pixel light-emitting structure can be subjected to elliptical guidance processing. A BM opening (second opening region) is formed above the R sub-pixel light-emitting structure and the B sub-pixel light-emitting structure, and a whole BM opening is formed above the G sub-pixel light-emitting structure, covering the divided pixels. The gridded BM opening (second opening region) is formed by a coating exposure and development process, and then a color filter 60 is filled in, which can be formed by an Ink process or a coating process, to fill the gridded BM opening and form a color filter layer.

[0075] In one possible implementation, see Figure 8 This is a cross-sectional structural diagram of a second type of display substrate provided in an embodiment of this application. The display substrate further includes a touch layer 80, which is located between the thin film encapsulation layer 40 and the black matrix layer 50.

[0076] In this embodiment, the touch layer 80 may include Fmloc (Flexible Multi Layer On Cell) and a buffer. The Fmloc film is directly deposited on the thin film encapsulation layer 40 of the display substrate, and the touch function is realized through an integrated process, which has the advantage of thinning the display substrate. The buffer layer can act as a stress relief layer, which can improve the stability and performance of the overall structure of the display substrate.

[0077] In one possible implementation, see Figure 9 This is a cross-sectional structural diagram of the third type of display substrate provided in this application embodiment. The thin film encapsulation layer 40 includes:

[0078] First inorganic encapsulation layer 41, organic encapsulation layer 42 and second inorganic encapsulation layer 43;

[0079] The first inorganic encapsulation layer 41 is located on the side of the pixel definition layer 20 away from the backplate 10, the organic encapsulation layer 42 is located on the side of the first inorganic encapsulation layer 41 away from the backplate 10, and the second inorganic encapsulation layer 43 is located on the side of the organic encapsulation layer 42 away from the backplate 10.

[0080] The thin-film encapsulation layer 40 of the display substrate provided in this application embodiment includes multiple encapsulation layers to form a composite encapsulation structure of inorganic / organic stacked layers. It can encapsulate the pixel light-emitting structure 30 to form a high barrier that can isolate water and oxygen erosion, thereby reducing the appearance of black spots on the display substrate. At the same time, it provides core support for the COE (black matrix layer 50 and color filter 60) structure.

[0081] In one possible implementation, such as Figure 9 As shown, the display substrate also includes a glass cover plate 90, which is located on the side of the protective layer 70 away from the back plate 10.

[0082] The main material of the glass cover plate 90 can be silicate glass, and its core functions include protecting the display substrate, improving the display effect, and enhancing impact resistance and scratch resistance.

[0083] It should be noted that, for the sake of convenience and simplicity, only one pixel region of the display substrate is shown in the accompanying drawings of this application. It is understood that, in practical applications, the display substrate usually includes multiple pixel regions, and the structures of each pixel region are the same or similar.

[0084] A second aspect of this application provides a display screen, the display screen including any of the display substrates described in the first aspect.

[0085] As can be seen from the above, the display screen provided in the embodiments of this application includes any of the display substrates described in the first aspect. Since the first sub-pixel in the same pixel in the display substrate includes at least two first sub-pixel light-emitting structures, and the first orthographic projection of each first sub-pixel light-emitting structure in the same pixel on the back plate is located within the second orthographic projection of the same second opening area in the black matrix layer on the back plate, and the first sub-pixel light-emitting structures in the same first sub-pixel are located below the same opening area of ​​the black matrix layer, the influence of the black matrix layer on the light emission of the first sub-pixel can be reduced, and the attenuation of the light emission of each first sub-pixel light-emitting structure in the first sub-pixel with the change of viewing angle can be slowed down, thereby improving the color shift problem of white light viewing angle when viewed from the side.

[0086] A third aspect of this application provides a display device, the display device including the display screen described in the second aspect.

[0087] As can be seen from the above, the display device provided in the embodiments of this application includes the display screen described in the second aspect. Since the display screen includes any of the display substrates described in the first aspect, and in the display substrate, the first sub-pixel in the same pixel includes at least two first sub-pixel light-emitting structures, and the first orthographic projection of each first sub-pixel light-emitting structure in the same pixel on the back plate is located within the second orthographic projection of the same second opening area in the black matrix layer on the back plate, and the first sub-pixel light-emitting structures in the same first sub-pixel are located below the same opening area of ​​the black matrix layer, the influence of the black matrix layer on the light emission of the first sub-pixel can be reduced, and the attenuation of the light emission of each first sub-pixel light-emitting structure in the first sub-pixel with the change of viewing angle can be slowed down, thereby improving the color shift problem of white light viewing angle when viewed from the side.

[0088] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0089] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the embodiments for the display screen and display device are basically similar to the embodiments for the display substrate, so the description is relatively simple; relevant parts can be referred to the description of the display substrate embodiments.

[0090] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A display substrate, characterized in that, The display substrate includes: Backplane, pixel definition layer, pixel light emission structure, thin film encapsulation layer, black matrix layer, color filter and protective layer; The pixel definition layer is located on the backplane, and the pixel definition layer includes a plurality of first opening regions, with the pixel light-emitting structure located in the first opening regions; the thin film encapsulation layer is located on the side of the pixel definition layer away from the backplane, the black matrix layer is located on the side of the thin film encapsulation layer away from the backplane, the black matrix layer includes a plurality of second opening regions, with at least a portion of the color filters located in the second opening regions; the color filters are located on the side of the black matrix layer away from the backplane, and the protective layer is located on the side of the black matrix layer and the color filters away from the backplane; The pixel light-emitting structure includes a first sub-pixel light-emitting structure, which is the light-emitting structure of the first sub-pixel in the pixel. The first sub-pixel in the same pixel includes at least two first sub-pixel light-emitting structures. The first orthographic projection of each first sub-pixel light-emitting structure in the same pixel on the back plate is located within the second orthographic projection of the same second opening region on the back plate.

2. The display substrate according to claim 1, characterized in that, The first sub-pixel in the same pixel includes two first sub-pixel light-emitting structures, and the second orthographic projection is elliptical.

3. The display substrate according to claim 2, characterized in that, The shape of the orthographic projection of the first sub-pixel light-emitting structure on the back plate is: half is a semicircle and the other half is a semi-ellipse; the semi-elliptical portions of two first sub-pixel light-emitting structures in the same pixel are adjacent.

4. The display substrate according to claim 1, characterized in that, The pixel light-emitting structure includes a second sub-pixel light-emitting structure and a third sub-pixel light-emitting structure. The second sub-pixel light-emitting structure is the light-emitting structure of the second sub-pixel in the pixel, and the third sub-pixel light-emitting structure is the light-emitting structure of the third sub-pixel in the pixel.

5. The display substrate according to claim 4, characterized in that, The third orthographic projection of the second sub-pixel light-emitting structure on the back plate is circular, and the fourth orthographic projection of the third sub-pixel light-emitting structure on the back plate is circular.

6. The display substrate according to claim 4, characterized in that, The shape of the orthographic projection of at least one of the second sub-pixel light-emitting structures and the third sub-pixel light-emitting structure on the back plate is: half is a semi-circle and the other half is a semi-ellipse.

7. The display substrate according to claim 1, characterized in that, The first sub-pixel is the blue sub-pixel.

8. The display substrate according to claim 1, characterized in that, The display substrate further includes a touch layer, which is located between the thin film encapsulation layer and the black matrix layer.

9. The display substrate according to claim 1, characterized in that, The thin-film encapsulation layer includes: First inorganic encapsulation layer, organic encapsulation layer and second inorganic encapsulation layer; The first inorganic encapsulation layer is located on the side of the pixel definition layer away from the backplane, the organic encapsulation layer is located on the side of the first inorganic encapsulation layer away from the backplane, and the second inorganic encapsulation layer is located on the side of the organic encapsulation layer away from the backplane.

10. A display screen, characterized in that, The display screen includes the display substrate as described in any one of claims 1-9.

Images