Display substrate and display device

Abstract

The display substrate and display device provided by the present disclosure include a base substrate; light-emitting devices of multiple colors arranged in an array on the base substrate; an anti-reflection layer located on the side of the layer where the light-emitting devices are located away from the base substrate; a chiral liquid crystal layer located between the layer where the light-emitting devices are located and the anti-reflection layer, the orthographic projection of the chiral liquid crystal layer on the base substrate overlaps with the orthographic projection of the light-emitting devices of at least one color on the base substrate, the central reflection wavelength of the chiral liquid crystal layer is approximately the same as the emission wavelength of the light-emitting device of at least one color overlapped with it, and the spiral direction of the chiral liquid crystal layer is left-handed or right-handed.

Description

Technical Field

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

[0002] In recent years, organic light-emitting display (OLED) as a new type of flat panel display has gradually attracted more attention. Due to its excellent characteristics such as active light emission, high light brightness, high resolution, wide viewing angle, fast response speed, small thickness, low energy consumption, flexibility, wide operating temperature range, simple structure and process, it has broad application prospects. Summary of the invention

[0003] The display substrate and the display device provided by the embodiments of the present disclosure are specifically provided as follows:

[0004] In one aspect, an embodiment of the present disclosure provides a display substrate, comprising:

[0005] substrate substrate;

[0006] Light-emitting devices of various colors are arranged in an array on the substrate;

[0007] An anti-reflection layer, located on a side of the layer where the light-emitting device is located away from the substrate;

[0008] A chiral liquid crystal layer is located between the layer where the light-emitting device is located and the anti-reflection layer, the orthographic projection of the chiral liquid crystal layer on the base substrate overlaps with the orthographic projection of the light-emitting device of at least one color on the base substrate, the central reflection wavelength of the chiral liquid crystal layer is approximately the same as the emission wavelength of the light-emitting device of at least one color overlapped therewith, and the spiral direction of the chiral liquid crystal layer is left-handed or right-handed.

[0009] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the light-emitting device includes a first light-emitting device, a second light-emitting device and a third light-emitting device of different colors, wherein the lifetime decay rate of the first light-emitting device, the lifetime decay rate of the second light-emitting device and the lifetime decay rate of the third light-emitting device increase in sequence;

[0010] The orthographic projection of the chiral liquid crystal layer on the base substrate at least overlaps with the orthographic projection of the third light emitting device on the base substrate.

[0011] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, the orthographic projection of the chiral liquid crystal layer on the base substrate overlaps with the orthographic projection of the third light-emitting device on the base substrate, and the orthographic projection of the chiral liquid crystal layer on the base substrate does not overlap with the orthographic projection of the first light-emitting device and the second light-emitting device on the base substrate.

[0012] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, the orthographic projection of the chiral liquid crystal layer on the base substrate at least completely covers the display area of ​​the display substrate, and the central reflection wavelength of the chiral liquid crystal layer is approximately the same as the emission wavelength of the third light-emitting device.

[0013] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the orthographic projection of the chiral liquid crystal layer on the base substrate overlaps with the orthographic projection of the second light-emitting device and the orthographic projection of the third light-emitting device on the base substrate, and the orthographic projection of the chiral liquid crystal layer on the base substrate does not overlap with the orthographic projection of the first light-emitting device on the base substrate;

[0014] The central reflection wavelength of the chiral liquid crystal layer overlapping with the second light-emitting device is substantially equal to the light-emitting wavelength of the second light-emitting device;

[0015] The central reflection wavelength of the chiral liquid crystal layer overlapping the third light emitting device is substantially equal to the emission wavelength of the third light emitting device.

[0016] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the orthographic projection of the chiral liquid crystal layer on the base substrate overlaps with the orthographic projection of all the light-emitting devices on the base substrate;

[0017] The central reflection wavelength of the chiral liquid crystal layer overlapping with the first light-emitting device is substantially equal to the light-emitting wavelength of the first light-emitting device;

[0018] The central reflection wavelength of the chiral liquid crystal layer overlapping with the second light-emitting device is substantially equal to the light-emitting wavelength of the second light-emitting device;

[0019] The central reflection wavelength of the chiral liquid crystal layer overlapping the third light emitting device is substantially equal to the emission wavelength of the third light emitting device.

[0020] In some embodiments, the display substrate provided in the embodiments of the present disclosure further includes: a pixel defining layer located on the side of the chiral liquid crystal layer facing the base substrate, wherein the pixel defining layer includes a plurality of pixel openings, and the light emitting device is disposed at the pixel openings;

[0021] The orthographic projection of the chiral liquid crystal layer on the base substrate is located within the orthographic projection of the pixel opening where the light-emitting device is located and overlapped with the chiral liquid crystal layer on the base substrate.

[0022] In some embodiments, the display substrate provided in the embodiments of the present disclosure further includes: a pixel defining layer located on the side of the chiral liquid crystal layer facing the base substrate, wherein the pixel defining layer includes a plurality of pixel openings, and the light emitting device is disposed at the pixel openings;

[0023] The orthographic projection of the chiral liquid crystal layer on the base substrate covers and is larger than the orthographic projection of the pixel opening where the light-emitting device is located and overlaps with the chiral liquid crystal layer on the base substrate.

[0024] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the percentage of the orthographic projection area of ​​the chiral liquid crystal layer on the base substrate to the orthographic projection area of ​​the pixel opening overlapped with it on the base substrate is negatively correlated with the life decay rate of the light-emitting device overlapped with the chiral liquid crystal layer.

[0025] In some embodiments, the display substrate provided in the embodiments of the present disclosure further includes: a pixel defining layer located on the side of the chiral liquid crystal layer facing the base substrate, wherein the pixel defining layer includes a plurality of pixel openings, and the light emitting device is disposed at the pixel openings;

[0026] The orthographic projection of the chiral liquid crystal layer on the base substrate substantially coincides with the orthographic projection of the pixel opening where the light-emitting device overlaps with the orthographic projection of the chiral liquid crystal layer on the base substrate.

[0027] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the average refractive index and / or the pitch of the chiral liquid crystal layer overlapping with the light-emitting devices of different colors are different.

[0028] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the spiral directions of the chiral liquid crystal layers overlapping with the light-emitting devices of different colors are the same.

[0029] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, the first light emitting device is red, the second light emitting device is green, and the third light emitting device is blue.

[0030] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the anti-reflection layer is a circular polarizer.

[0031] In some embodiments, the above-mentioned display substrate provided in the embodiments of the present disclosure further includes: a light absorbing layer located between the layer where the multiple light-emitting devices are located and the chiral liquid crystal layer, and the orthographic projection of the light absorbing layer on the base substrate roughly coincides with the orthographic projection of the pixel defining layer on the base substrate.

[0032] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, it further includes: a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer are sequentially arranged on a side of the light-emitting device facing the chiral liquid crystal layer;

[0033] The light absorption layer is located between the first inorganic encapsulation layer and the organic encapsulation layer, or the light absorption layer is located between the second inorganic encapsulation layer and the chiral liquid crystal layer.

[0034] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, it further includes: a touch function layer located between the layer where the light-emitting device is located and the chiral liquid crystal layer;

[0035] The light absorption layer is located between the touch function layer and the chiral liquid crystal layer.

[0036] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the anti-reflection layer is a color film, and the color film includes a black matrix and a plurality of color resists separated by the black matrix; wherein,

[0037] The orthographic projection of the color resist on the base substrate substantially coincides with the orthographic projection of the pixel opening on the base substrate, and the orthographic projection of the black matrix on the base substrate substantially coincides with the orthographic projection of the pixel defining layer on the base substrate.

[0038] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, the display area of ​​the display substrate includes a left frame area and a right frame area, wherein the spiral direction of the chiral liquid crystal layer in the left frame area is opposite to the spiral direction of the chiral liquid crystal layer in the right frame area, and the total number of the light-emitting devices in the left frame area is equal to the total number of the light-emitting devices in the right frame area.

[0039] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the left frame area and the right frame area are respectively areas on both sides of the symmetry axis of the display area in the column direction.

[0040] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the left frame area and the right frame area are alternately arranged in the row direction and / or column direction, and each of the left frame area or the right frame area has at least one light-emitting device.

[0041] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the orthographic projection center of the chiral liquid crystal layer on the base substrate roughly coincides with the orthographic projection center of the light-emitting devices that overlap with each other.

[0042] On the other hand, an embodiment of the present disclosure further provides a display device, comprising the above-mentioned display substrate provided by an embodiment of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of an OLED panel reflecting external natural light in the related art;

[0044] Figure 2 Schematic diagram of the structure of a circular polarizer;

[0045] Figure 3 for Figure 2 Schematic diagram of anti-reflection of the linear polarizing layer in the circular polarizer shown;

[0046] Figure 4 for Figure 2 Schematic diagram of anti-reflection of the linear polarizing layer combined with the quarter-wave plate layer in the circular polarizer shown;

[0047] Figure 5 A schematic diagram of the structure of a display substrate provided in an embodiment of the present disclosure;

[0048] Figure 6 For along Figure 5 A schematic diagram of a cross-sectional structure along line I-II;

[0049] Figure 7 A schematic diagram of improving light extraction efficiency of a display substrate with a circular polarizer provided in an embodiment of the present disclosure;

[0050] Figure 8 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0051] Fig. 9 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0052] Fig.10 A schematic diagram of another structure of a display substrate provided in an embodiment of the present disclosure;

[0053] Fig.11 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0054] Fig.12 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0055] Fig.13 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0056] Fig.14 For along Figure 5Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0057] Fig.15 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0058] Fig.16 A schematic diagram showing the anti-reflection effect of a display substrate with a circular polarizer provided in an embodiment of the present disclosure;

[0059] Fig.17 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0060] Fig.18 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0061] Fig.19 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0062] Fig. 20 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0063] Fig.21 For along Figure 5 Another schematic diagram of the cross-sectional structure of the middle I-II line;

[0064] Fig. 22 A schematic diagram of improving light extraction efficiency of a display substrate with a color film provided in an embodiment of the present disclosure;

[0065] Fig.23 Schematic diagram of anti-reflection of color film;

[0066] Fig.24 is a schematic diagram of 3D polarization display in the related art;

[0067] Fig.25 A schematic diagram of realizing 3D polarized display by a display substrate with a color film provided in an embodiment of the present disclosure;

[0068] Fig.26 A schematic structural diagram of a left frame area and a right frame area in a display substrate provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the embodiment of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiment of the present disclosure. It should be noted that the size and shape of each figure in the drawings do not reflect the actual proportion, and the purpose is only to illustrate the content of the present disclosure. And the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0070] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present disclosure belongs. The words "first", "second" and similar terms used in the present disclosure specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Inside", "outside", "upper", "lower" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0071] Due to the reflection of external natural light by the cathode / anode metal in the organic light-emitting display and the metal wires of the backplane drive circuit, the contrast and outdoor visibility of the screen are low. Figure 1 Therefore, in current organic light-emitting displays, an anti-reflection layer (such as a circular polarizer) is generally provided to improve this problem. Figure 2 As shown, the circular polarizer includes a laminated adhesive layer, a quarter wave plate layer, an adhesive layer, a triacetate layer, a linear polarizer layer, a triacetate layer and a surface treatment layer, wherein the main functional layers are the linear polarizer layer and the quarter wave plate layer. The anti-reflection principle is as follows Figure 3 and Figure 4 However, due to the presence of the linear polarizing layer, the theoretical maximum transmittance of light emitted from the OLED microcavity can only reach 50%, and the actual situation is generally between 40% and 45%, resulting in reduced OLED light output efficiency and increased power consumption.

[0072] In order to at least improve the above technical problems existing in the related art, the present disclosure provides a display substrate, such as Figure 5 and Figure 6 As shown, including:

[0073] Base substrate 101;

[0074] Light-emitting devices 102 of various colors are arranged in an array on the base substrate 101;

[0075] The anti-reflection layer 103 is located on the side of the layer where the light-emitting device 102 is located away from the base substrate 101. The anti-reflection layer 103 can be a circular polarizer or a color film, wherein the color film includes a black matrix and a plurality of color resists separated by the black matrix;

[0076] The chiral liquid crystal layer 104 is located between the layer where the light-emitting device 102 is located and the anti-reflection layer 103. The orthographic projection of the chiral liquid crystal layer 104 on the base substrate 101 overlaps with the orthographic projection of the light-emitting device 102 of at least one color on the base substrate 101. The central reflection wavelength of the chiral liquid crystal layer 104 is approximately the same as the emission wavelength of the at least one color light-emitting device 102 with which it is overlapped. The spiral direction of the chiral liquid crystal layer 104 is left-handed or right-handed.

[0077] In the above display substrate provided by the embodiment of the present disclosure, only when the wavelength of the light is the same as the central reflection wavelength of the chiral liquid crystal layer 104 and the polarization direction of the light is consistent with the spiral direction of the chiral liquid crystal layer 104, the light will be reflected by the chiral liquid crystal layer 104, and the light of any wavelength band whose polarization direction is opposite to the spiral direction of the chiral liquid crystal layer 104 can directly pass through the chiral liquid crystal layer 104. Specifically, the anti-reflection layer 103 is a circular polarizer, combined with the area where a light-emitting device 102 is located, as an example, Figure 7 As shown, when the light emitting device 102 emits light (considered to be natural light, which can be decomposed into equal amounts of left-handed polarized light and right-handed polarized light), assuming that the spiral direction of the chiral liquid crystal layer 104 is left-handed, then the right-handed polarized light will be transmitted, and will become linearly polarized light through the quarter-wave plate layer 1032 in the circular polarizer, and then pass through the linear polarizer layer 1031 to emit normally. The left-handed polarized light will be reflected by the chiral liquid crystal layer 104. Since the refractive index of the chiral liquid crystal layer 104 is lower than that of the film layer below, there is no half-wave loss. The left-handed polarized light will return to the film layer where the light emitting device 102 is located, and after reflecting on the metal electrode (there is a half-wave loss here), it will become right-handed polarized light, and then pass through the circular polarizer to emit. As a result, the chiral liquid crystal layer 104 can improve the light extraction efficiency of the light emitting device 102 whose light emission wavelength is the same as its central reflection wavelength. Based on this, by arranging chiral liquid crystal layers with corresponding central reflection wavelengths above light emitting devices 102 of different colors, the overall light extraction efficiency of the display substrate can be maximized, and power consumption can be significantly reduced.

[0078] It should be noted that in the embodiments provided in the present disclosure, due to the limitations of process conditions or the influence of other factors such as measurement, "approximately" may be completely identical or may have some deviations. Therefore, as long as the "approximately" relationship between related features satisfies the allowable error (for example, a fluctuation of 10% up and down), it belongs to the protection scope of the present disclosure.

[0079] For OLED display, after a long time of dotting the screen, a long-term afterimage (burn in) will occur. The area where the long-term afterimage occurs and the surrounding area mainly have differences in brightness and chromaticity, where the brightness difference comes from the brightness attenuation of different color luminescent materials, and the chromaticity difference comes from the uneven brightness attenuation of different color light-emitting devices 102. At present, the general situation is that the life of the red light-emitting device> the life of the green light-emitting device> the life of the blue light-emitting device, and many polarizers also have the problem of red light and green light transmittance> blue light transmittance, which leads to the phenomenon that the white screen will turn yellow after being lit for a long time. In response to this problem, a common treatment method is to increase the aperture ratio of the blue light-emitting device, so that the aperture ratio of the blue light-emitting device> the aperture ratio of the green light-emitting device> the aperture ratio of the red light-emitting device, so that the life of the red light-emitting device, the blue light-emitting device and the green light-emitting device are as equal as possible, especially for application scenarios with long life requirements, such as car-mounted, laptop computers, etc., the aperture ratio of the blue light-emitting device is much larger than the aperture ratio of the red light-emitting device and the aperture ratio of the green light-emitting device. However, such a design will also bring other disadvantages, such as affecting the backplane routing and the overall aperture ratio.

[0080] In order to solve the technical problem of unequal lifespans of the light emitting devices 102 of different colors, in the display substrate provided in the embodiment of the present disclosure, Figure 8 As shown, the light-emitting device 102 may include a first light-emitting device R (for example, a red light-emitting device), a second light-emitting device G (for example, a green light-emitting device) and a third light-emitting device B (for example, a blue light-emitting device) of different colors, wherein the lifetime decay rate of the first light-emitting device R, the lifetime decay rate of the second light-emitting device G and the lifetime decay rate of the third light-emitting device B increase in sequence; and the orthographic projection of the chiral liquid crystal layer 104 on the base substrate 101 at least overlaps with the orthographic projection of the third light-emitting device B on the base substrate 101.

[0081] By setting a chiral liquid crystal layer 104 above the third light-emitting device B with the greatest degree of lifetime attenuation, the light extraction efficiency of the third light-emitting device B can be effectively increased, thereby reducing the current of the third light-emitting device B, and further improving the aging of the light-emitting material in the third light-emitting device B, thereby extending the lifetime of the third light-emitting device B, so that the difference in lifetime among the first light-emitting device R, the second light-emitting device G and the third light-emitting device B is small, even negligible, effectively improving the problem of uneven lifetimes of light-emitting devices 102 of different colors.

[0082] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Figure 8As shown, the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 can overlap with the orthographic projection of the third light-emitting device B on the substrate 101, and the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 does not overlap with the orthographic projections of the first light-emitting device R and the second light-emitting device G on the substrate 101. In this case, the life of the third light-emitting device B with the largest life decay rate can be increased by the chiral liquid crystal layer 104, the life difference between the third light-emitting device B and the first light-emitting device R and the second light-emitting device G can be reduced, and the problem of uneven life of the first light-emitting device R, the second light-emitting device G, and the third light-emitting device B can be improved.

[0083] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Figure 5 and Fig. 9 As shown, the orthographic projection of the chiral liquid crystal layer 104 on the base substrate 101 at least completely covers the display area AA of the display substrate, and the central reflection wavelength of the chiral liquid crystal layer 104 is substantially the same as the emission wavelength of the third light-emitting device B. Since the central reflection wavelength of the chiral liquid crystal layer 104 is substantially the same as the emission wavelength of the third light-emitting device B, the chiral liquid crystal layer 104 only reflects the polarized light in the third light-emitting device B with the same spiral direction as the chiral liquid crystal layer 104, while the polarized light in the light of the first light-emitting device R, the second light-emitting device G and the third light-emitting device B with the opposite spiral direction to the chiral liquid crystal layer 104 can directly pass through without being affected. In terms of panel optics, this is reflected in the increase of the light extraction efficiency of the third light-emitting device B, which increases the life of the third light-emitting device B. Moreover, since the chiral liquid crystal layer 104 is arranged on the entire surface, compared with Figure 8 In the solution shown, the chiral liquid crystal layer 104 is only provided above the third light emitting device B, so that a mask process can be omitted and the process is relatively simple.

[0084] It should be noted that, in some embodiments, Figure 5 As shown, when the display substrate provided by the embodiment of the present disclosure is a full screen, the area of ​​the display area AA is substantially the same as the area of ​​the surface of the base substrate 101 facing the light emitting device 102, so the orthographic projection of the chiral liquid crystal layer 104 on the base substrate 101 at least completely covers the display area AA of the display substrate, which is equivalent to the chiral liquid crystal layer 104 being arranged on the entire surface. In other embodiments, such as Fig.10 As shown, the display substrate provided by the embodiment of the present disclosure may include a display area AA and a frame area BB, and the orthographic projection of the chiral liquid crystal layer 104 on the base substrate 101 at least completely covers the display area AA of the display substrate, which may include the following two schemes: first, the chiral liquid crystal layer 104 is only arranged in the display area AA; second, the chiral liquid crystal layer 104 is simultaneously arranged in the display area AA and the frame area BB, that is, the chiral liquid crystal layer 104 is arranged on the entire surface.

[0085] In some embodiments, in the display substrate provided in the embodiments of the present disclosure, in order to further balance the lifespan of the light emitting devices 102 of different colors, as shown in FIG. Fig.11 As shown, the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 overlaps with the orthographic projections of the second light-emitting device G and the third light-emitting device B on the substrate 101, and the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 does not overlap with the orthographic projection of the first light-emitting device R on the substrate 101; the central reflection wavelength of the chiral liquid crystal layer 104 overlapping with the second light-emitting device G is approximately equal to the light-emitting wavelength of the second light-emitting device G, so that the light extraction efficiency of the second light-emitting device G is improved through the chiral liquid crystal layer 104, and the life of the second light-emitting device G is extended; the central reflection wavelength of the chiral liquid crystal layer 104 overlapping with the third light-emitting device B is approximately equal to the light-emitting wavelength of the third light-emitting device B, so that the light extraction efficiency of the second light-emitting device G is improved through the chiral liquid crystal layer 104, and the life of the second light-emitting device G is extended.

[0086] In specific implementation, the process flow of the chiral liquid crystal layer 104 can be: coating the alignment layer → pre-curing → main curing → alignment → post-drying → coating the chiral liquid crystal material → low-temperature drying solvent → ultraviolet (UV) curing. Among them, the material of the alignment layer can be polyimide (PI), and the material can be cured into a film under low temperature conditions, specifically, it can be limited to below 95°C. In addition, the chiral liquid crystal layer 104 above the second light-emitting device G and the third light-emitting device B can be made respectively through two patterning processes. For example, after the chiral liquid crystal layer 104 above the second light-emitting device G is UV-cured, the chiral liquid crystal layer 104 above the third light-emitting device B can be made (here only includes the three steps of "coating the chiral liquid crystal material → low-temperature drying solvent → UV curing"), and a photoresist (PR) glue can be used to protect the chiral liquid crystal layer 104 above the second light-emitting device G made earlier.

[0087] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Fig.12As shown, the orthographic projection of the chiral liquid crystal layer 104 on the base substrate 101 overlaps with the orthographic projection of all the light-emitting devices 102 on the base substrate 101; the central reflection wavelength of the chiral liquid crystal layer 104 overlapping the first light-emitting device R is approximately equal to the light-emitting wavelength of the first light-emitting device R; the central reflection wavelength of the chiral liquid crystal layer 104 overlapping the second light-emitting device G is approximately equal to the light-emitting wavelength of the second light-emitting device G; the central reflection wavelength of the chiral liquid crystal layer 104 overlapping the third light-emitting device B is approximately equal to the light-emitting wavelength of the third light-emitting device B. In this way, the light extraction efficiency of the light-emitting devices 102 of corresponding colors can be improved respectively by the chiral liquid crystal layers 104 with different central reflection wavelengths. In specific implementation, the chiral liquid crystal layers above the first light-emitting device R, the second light-emitting device G and the third light-emitting device B can be made respectively by three patterning processes.

[0088] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Figure 8 , Fig.11 and Fig.12 As shown, it may also include: a pixel defining layer 105 located on the side of the chiral liquid crystal layer 104 facing the base substrate 101, wherein the pixel defining layer 105 includes a plurality of pixel openings (equivalent to the effective light-emitting area of ​​the light-emitting device 102), and the light-emitting device 102 is arranged at the pixel opening; the orthographic projection of the chiral liquid crystal layer 104 on the base substrate 101 may be located within the orthographic projection of the pixel opening where the light-emitting device 102 overlaps with the chiral liquid crystal layer 104 on the base substrate 101, that is, the ratio of the orthographic projection area of ​​the chiral liquid crystal layer 104 to the pixel opening thereunder is less than 1; or, as Fig.13 As shown, the orthographic projection of the chiral liquid crystal layer 104 on the base substrate 101 is roughly coincident with the orthographic projection of the pixel opening of the light emitting device 102 overlapped therewith, that is, the ratio of the orthographic projection area of ​​the chiral liquid crystal layer 104 to the pixel opening thereunder is roughly 1, so as to effectively improve the light output efficiency of the light emitting device 102 at a normal viewing angle. Fig.14 and Fig.15 As shown, the orthographic projection of the chiral liquid crystal layer 104 on the base substrate 101 covers and is larger than the orthographic projection of the pixel opening of the light-emitting device 102 overlapping with the chiral liquid crystal layer 104 on the base substrate 101, that is, the ratio of the orthographic projection area of ​​the chiral liquid crystal layer 104 to the pixel opening thereunder is greater than 1. Specifically, Fig.12 There is a gap between the chiral liquid crystal layers 104 above the light emitting devices 102 of different colors. Fig.15The chiral liquid crystal layers 104 above the light emitting devices 102 of different colors are in contact with each other, so as to simultaneously improve the light extraction efficiency of the light emitting devices 102 at both the normal viewing angle and the oblique viewing angle. It should be noted that the area of ​​the chiral liquid crystal layer 104 above the light emitting devices 102 of different colors that exceeds the pixel opening below it (i.e., the overlapping area with the pixel defining layer 105) can be the same or different, and is not specifically limited here.

[0089] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Fig.12 and Fig.14 As shown, the percentage of the orthogonal projection area of ​​the chiral liquid crystal layer 104 on the base substrate 101 to the orthogonal projection area of ​​the pixel opening overlapped therewith on the base substrate 101 is negatively correlated with the life decay rate of the light emitting device 102 overlapped therewith by the chiral liquid crystal layer 104. The larger the overlapping area of ​​the chiral liquid crystal layer 104 and the pixel opening thereunder, the more obvious the effect of improving the light extraction efficiency of the light emitting device 102 at the pixel opening. Therefore, the above arrangement can improve the light extraction efficiency of the light emitting devices 102 of different colors and make the lifespans of the light emitting devices 102 of different colors almost the same.

[0090] In some embodiments, since the life decay rates of the first light-emitting device R, the second light-emitting device G, and the third light-emitting device B increase in sequence, the ratio of the chiral liquid crystal layer 104 above the second light-emitting device G to the orthogonal projection area of ​​the pixel opening where the second light-emitting device G is located is greater than the ratio of the chiral liquid crystal layer 104 above the first light-emitting device R to the orthogonal projection area of ​​the pixel opening where the first light-emitting device R is located, and is less than the ratio of the chiral liquid crystal layer 104 above the third light-emitting device B to the orthogonal projection area of ​​the pixel opening where the third light-emitting device B is located. Optionally, the ratio of the chiral liquid crystal layer 104 above the third light-emitting device B to the orthogonal projection area of ​​the pixel opening where the third light-emitting device B is located is 95% to 100%; the ratio of the chiral liquid crystal layer 104 above the second light-emitting device G to the orthogonal projection area of ​​the pixel opening where the second light-emitting device G is located is 85% to 95%; the ratio of the chiral liquid crystal layer 104 above the first light-emitting device R to the orthogonal projection area of ​​the pixel opening where the first light-emitting device R is located is 70% to 85%.

[0091] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, the central reflection wavelength of the chiral liquid crystal layer 104 satisfies the following relationship: max =n avg *P, △λ=△n*P; where λ max is the peak value of the central reflection wavelength of the chiral liquid crystal layer 104, n avgis the average refractive index of the chiral liquid crystal layer 104, P is the pitch of the chiral liquid crystal layer 104, Δλ is the spectral width of the central reflection wavelength of the chiral liquid crystal layer 104, and Δn is the difference between the ordinary light refractive index and the extraordinary light refractive index of the chiral liquid crystal layer 104. Therefore, the central reflection wavelength of the chiral liquid crystal layer 104 above the light-emitting devices 102 of different colors can be obtained by adjusting the average refractive index and / or the pitch of the chiral liquid crystal layer 104 above the light-emitting devices 102 of different colors. In other words, the chiral liquid crystal layer 104 overlapping the light-emitting devices 102 of different colors has different average refractive index and / or pitch.

[0092] In some embodiments, the average refractive index n of the chiral liquid crystal layer 104 is avg is greater than or equal to 1.2 and less than or equal to 1.8, the pitch P of the chiral liquid crystal layer 104 is greater than 0 μm and less than or equal to 3 μm, and the difference △n between the ordinary light refractive index and the extraordinary light refractive index of the chiral liquid crystal layer 104 is greater than 0 and less than or equal to 0.2. Specifically, the central reflection wavelength of the chiral liquid crystal layer 104 above the first light-emitting device R (for example, the red light-emitting device 102) may be (620±30) nm, the central reflection wavelength of the chiral liquid crystal layer 104 above the second light-emitting device G (for example, the green light-emitting device 102) may be (530±30) nm, and the central reflection wavelength of the chiral liquid crystal layer 104 above the third light-emitting device B (for example, the blue light-emitting device 102) may be (450±30) nm.

[0093] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, the spiral directions of the chiral liquid crystal layers 104 overlapping with the light-emitting devices 102 of different colors are the same. In other words, the spiral directions of the chiral liquid crystal layers 104 above the light-emitting devices 102 of different colors can be both left-handed or both right-handed.

[0094] However, in the present disclosure, although the chiral liquid crystal layer 104 can improve the light extraction efficiency of the internal light, when the anti-reflection layer 103 is a circular polarizer, the chiral liquid crystal layer 104 will have a negative effect on the anti-reflection of the circular polarizer, such as Fig.16 In the optical path shown, after the external natural light passes through the linear polarization layer 1031 in the circular polarizer, half of the light is absorbed and converted into linear polarized light. After the polarization direction of this part of light is changed by the metal interface, it cannot pass through the chiral liquid crystal layer 104, so it is reflected back and forth between the chiral liquid crystal layer 104 and the metal electrode, and finally penetrates the circular polarizer and emits. This result will increase the reflectivity of the display screen, affecting the display effect.

[0095] Based on this, in order to improve the anti-reflection effect, in the above-mentioned display substrate provided in the embodiment of the present disclosure, as Fig.17As shown, it may also include: a light absorbing layer 109 located between the layer where the multiple light emitting devices 102 are located and the chiral liquid crystal layer 104, the orthographic projection of the light absorbing layer 109 on the base substrate 101 substantially coincides with the orthographic projection of the pixel defining layer 105 on the base substrate 101, and the light absorbing layer 109 is used to absorb the external light incident into the interior of the display substrate, thereby preventing it from being reflected back to the outside by the metal electrode. In some embodiments, the light absorbing layer 109 may be made of a black matrix material.

[0096] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Fig.17 and Fig.18 As shown, it may also include: a first inorganic encapsulation layer 106, an organic encapsulation layer 107, and a second inorganic encapsulation layer 108 sequentially disposed on the side of the light emitting device 102 facing the chiral liquid crystal layer 104; the light absorbing layer 109 is located between the first inorganic encapsulation layer 106 and the organic encapsulation layer 107, or the light absorbing layer 109 is located between the second inorganic encapsulation layer 108 and the chiral liquid crystal layer 104. In some embodiments, as Fig.19 As shown, the display substrate may also include a touch function layer 110 located between the layer where the light emitting devices 102 are located and the chiral liquid crystal layer 104; and the light absorption layer 109 is located between the touch function layer 110 and the chiral liquid crystal layer 104. It should be understood that as long as the light absorption layer 109 is located between the layer where the plurality of light emitting devices 102 are located and the chiral liquid crystal layer 104, it is not limited to Figures 17 to 19 The film positions are shown.

[0097] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Fig. 20 As shown, it can also include a first adhesive layer 111 disposed in contact with the surface of the chiral liquid crystal layer 104 facing the base substrate 101, and a second adhesive layer 112 disposed in contact with the surface of the circular polarizer away from the base substrate 101, so that the chiral liquid crystal layer 104 is fixed on the first flat layer 113 for reducing the step difference through the first adhesive layer 111, and the circular polarizer is fixed on the cover plate 114 through the second adhesive layer 112. In the case of fixing the chiral liquid crystal layer 104 with the first adhesive layer 111, the chiral liquid crystal layer 104 can be prepared on PET, PI or other substrate materials. Of course, in specific implementation, such as Fig.18 As shown, the chiral liquid crystal layer 104 may be directly manufactured on the first flat layer 113 , and the film layers of the circular polarizer may be directly manufactured on the chiral liquid crystal layer 104 , and no specific limitation is made here.

[0098] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Fig.21 and Fig. 22As shown, the anti-reflection layer 103 may be a color film 103', which includes a plurality of color resists 1033 and a black matrix 1034, wherein each color resist 1033 is separated by the black matrix 1034, and the orthographic projection of the color resist 1033 on the substrate 101 substantially coincides with the orthographic projection of the pixel opening on the substrate 101, and the orthographic projection of the black matrix 1034 on the substrate 101 substantially coincides with the orthographic projection of the pixel defining layer 105 on the substrate 101. In order to improve color purity, it is preferred that the orthographic projection of the color resist 1033 on the substrate 101 is slightly larger than the orthographic projection of the pixel opening on the substrate 101, and correspondingly, the orthographic projection of the black matrix 1034 on the substrate 101 is slightly smaller than the orthographic projection of the pixel defining layer 105 on the substrate 101.

[0099] Specifically, take the area where a light emitting device 102 is located as an example for description. Fig. 22 As shown, when the light emitting device 102 emits light (considered to be natural light, which can be decomposed into equal amounts of left-handed polarized light and right-handed polarized light), assuming that the chiral liquid crystal molecules in the chiral liquid crystal layer 104 are left-handed, then the right-handed polarized light will be transmitted and normally emitted through the color resist 1033. The left-handed polarized light will be reflected by the chiral liquid crystal layer 104. Since the refractive index of the chiral liquid crystal layer 104 is lower than that of the film layer below, there is no half-wave loss. The left-handed polarized light will return to the film layer where the light emitting device 102 is located, and after reflecting on the metal electrode (where there is a half-wave loss), it will become right-handed polarized light, and then emit in the same way. As a result, the chiral liquid crystal layer 104 can improve the light extraction efficiency of the light emitting device 102 whose light emission wavelength is the same as its central reflection wavelength. Based on this, by respectively setting a chiral liquid crystal layer with a corresponding central reflection wavelength above the light emitting devices 102 of different colors, the overall light extraction efficiency of the display substrate can be maximized, and the power consumption can be significantly reduced. In addition, since the color resist 1033 , the first flat layer 113 and the cover plate 114 are all made of isotropic materials, the polarization state of the light will not be changed after passing through these layers.

[0100] In some embodiments, the color resist 1033 may include a red color resist located above the red light emitting device (R), a green color resist located above the green light emitting device (G), and a blue color resist located above the blue light emitting device (B).

[0101] In addition, if Fig.23As shown, the transmittance of the circular polarizer is generally between 40% and 45%, while the color filter 103' (color filter on encapsulation, COE) composed of the color resist 1033 and the black matrix 1034 made on the encapsulation layer can reach 60% according to the simulation transmittance, which is greatly improved compared with the circular polarizer. Therefore, the COE structure of the present disclosure combined with the chiral liquid crystal layer 104 can effectively improve the light extraction efficiency and reduce the reflection of ambient light, which is very beneficial for 3D screens with high brightness requirements.

[0102] The existing 3D display methods are mainly divided into glasses type and naked eye type. Among them, the glasses type uses polarization 3D technology, which has the smallest color loss, the color display is closest to the original value, the 3D display effect is also more prominent, and the three-dimensional feeling is real. The existing polarization 3D technology is to set linear polarizers with absorption axes perpendicular to each other on the left and right glasses, respectively receiving linear polarized light in two vibration directions, so as to realize 3D display in the human brain.

[0103] However, there is an obvious problem in using linear polarized light to achieve 3D display. When the left and right eyes are not on the same horizontal line, crosstalk will occur between the left and right frames, affecting the stereoscopic image effect. However, in actual movie watching, it is difficult for viewers to keep their heads completely upright for a long time. Therefore, the use of linear polarized 3D technology cannot meet the needs of comfortable viewing.

[0104] The current improvement plan is to use circular polarization 3D technology. This technology is to add a circular polarizer on the screen or in front of the projector lens, so that the light emitted by the screen or projector is circularly polarized light, where the left and right frames correspond to one of the left-handed polarized light or the right-handed polarized light. In addition, circular polarizers are also attached to the left and right glasses to correspond to the two kinds of circular polarizers. The specific structure is as follows Fig.24 shown.

[0105] The advantage of this arrangement is that, since the vibration direction of the linearly polarized light output by the quarter-wave plate layer on the glasses is fixed relative to the optical axis direction of the quarter-wave plate layer, it will not be affected by the deviation of the glasses. In other words, changes in posture (relative angle with the screen) and position during the viewing process will not affect the 3D effect.

[0106] However, this principle is difficult to apply to OLED displays. First, OLED needs to be attached with a circular polarizer due to the need for anti-reflection. The structure and anti-reflection principle of OLED can be seen in Figure 4, because the linear polarizer is located on the top layer, the light emitted by the OLED is linearly polarized, and this process causes at least half of the light emitted by the OLED to be absorbed. If, on this basis, a quarter-wave plate layer is attached to the screen to convert linear polarized light into circular polarized light for 3D display, the brightness of the left and right frames will be lost by half, resulting in insufficient brightness when watching movies, or extremely high power consumption of the display.

[0107] like Fig.25 As shown, the emitted light (including left-handed polarized light and right-handed polarized light) of each light emitting device 102 in the present disclosure can all be emitted as left-handed polarized light or right-handed polarized light through the chiral liquid crystal layer 104, thereby improving the light extraction efficiency, and because the color resistance 1033, the first flat layer 113 and the cover plate 114 are all isotropic materials, the polarization state of the light will not be changed after passing through these layers. Therefore, the 3D effect can be achieved in conjunction with the circular polarizers attached to the left and right glasses respectively, and the changes in posture (relative angle with the screen) and position during the viewing process will not affect the 3D effect.

[0108] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Fig.26 As shown, the display area of ​​the display substrate includes a left frame area and a right frame area, wherein the spiral direction of the chiral liquid crystal layer 104 in the left frame area is opposite to the spiral direction of the chiral liquid crystal layer 104 in the right frame area, and the total number of light-emitting devices 102 in the left frame area is equal to the total number of light-emitting devices 102 in the right frame area, so as to achieve a 3D effect while improving the viewing experience.

[0109] Optionally, the spiral direction of the chiral liquid crystal layer 104 in the left frame area can be left-handed, so that the emission light of the light-emitting device 102 becomes right-handed polarized light after passing through the chiral liquid crystal layer 104; the spiral direction of the chiral liquid crystal layer 104 in the right frame area can be right-handed, so that the emission light of the light-emitting device 102 becomes left-handed polarized light after passing through the chiral liquid crystal layer 104; or, the spiral direction of the chiral liquid crystal layer 104 in the right frame area can be left-handed, so that the emission light of the light-emitting device 102 becomes right-handed polarized light after passing through the chiral liquid crystal layer 104; the spiral direction of the chiral liquid crystal layer 104 in the left frame area can be right-handed, so that the emission light of the light-emitting device 102 becomes left-handed polarized light after passing through the chiral liquid crystal layer 104.

[0110] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Fig.26As shown, the left frame area and the right frame area are areas on both sides of the symmetry axis of the display area in the column direction; or, the left frame area and the right frame area are alternately arranged in the row direction and / or the column direction, and each left frame area or right frame area has at least one light-emitting device 102. Of course, in specific implementation, other arrangements of the left frame area and the right frame area known to those skilled in the art may also be adopted, which is not limited here.

[0111] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, the orthographic projection center of the chiral liquid crystal layer 104 on the base substrate 101 roughly coincides with the orthographic projection center of the overlapping light-emitting devices 102, so that the viewing angle brightness attenuation and color deviation at each azimuth angle remain consistent.

[0112] In the present disclosure, the orthographic projection center of the chiral liquid crystal layer 104 can be a central area that deviates from the geometric center of the orthographic projection of the chiral liquid crystal layer 104 by 0μm-1μm; the orthographic projection center of the light-emitting device 102 can be a central area that deviates from the geometric center of the orthographic projection of the light-emitting device 102 by 0μm-1μm.

[0113] In some embodiments, in the above-mentioned display substrate provided in the embodiments of the present disclosure, if Fig.21 As shown, in order to reduce the step difference, a second flat layer 113' covering the chiral liquid crystal layer 104 may be provided. In addition, in order to reduce the step difference, a third flat layer 113" may be provided above the color resist 1033. Usually, the display substrate may also include a driving circuit layer 115 to drive the light-emitting device 102 to emit light. Other essential components of the display substrate should be understood by those skilled in the art, and will not be elaborated here, nor should they be used as limitations to the present disclosure.

[0114] Based on the same inventive concept, the embodiment of the present disclosure provides a display device, including the above-mentioned display substrate provided by the embodiment of the present disclosure. Since the principle of solving the problem by the display device is similar to the principle of solving the problem by the above-mentioned display substrate, the implementation of the display device provided by the embodiment of the present disclosure can refer to the implementation of the above-mentioned display substrate provided by the embodiment of the present disclosure, and the repeated parts will not be repeated.

[0115] In some embodiments, the display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a laptop computer, a digital photo frame, a navigator, a smart watch, a fitness wristband, a personal digital assistant, etc. The display device includes, but is not limited to, components such as a radio frequency unit, a network module, an audio output & input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. In addition, it can be understood by those skilled in the art that the above structure does not constitute a limitation on the above display device provided in the embodiment of the present disclosure. In other words, the above display device provided in the embodiment of the present disclosure may include more or less of the above components, or combine certain components, or arrange the components differently.

[0116] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make various changes and modifications to the embodiments of the present disclosure without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if these modifications and variations of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to include these modifications and variations.

Claims

1. A display substrate, wherein: include: substrate substrate; Light-emitting devices of various colors are arranged in an array on the substrate; An anti-reflection layer, located on a side of the layer where the light-emitting device is located away from the substrate; A chiral liquid crystal layer, located between the layer where the light-emitting device is located and the anti-reflection layer, wherein the helical direction of the chiral liquid crystal layer is left-handed or right-handed; The light-emitting device comprises a first light-emitting device, a second light-emitting device and a third light-emitting device of different colors, wherein the lifetime decay rate of the first light-emitting device, the lifetime decay rate of the second light-emitting device and the lifetime decay rate of the third light-emitting device increase in sequence; The orthographic projection of the chiral liquid crystal layer on the substrate does not overlap with the orthographic projection of at least one of the first light-emitting device and the second light-emitting device on the substrate, but overlaps with the orthographic projection of the third light-emitting device on the substrate, and the central reflection wavelength of the chiral liquid crystal layer is substantially the same as the emission wavelength of the light-emitting device with which it is overlapped.

2. The display substrate according to claim 1, wherein: The orthographic projection of the chiral liquid crystal layer on the base substrate overlaps with the orthographic projection of the second light emitting device and the orthographic projection of the third light emitting device on the base substrate, and the orthographic projection of the chiral liquid crystal layer on the base substrate does not overlap with the orthographic projection of the first light emitting device on the base substrate; The central reflection wavelength of the chiral liquid crystal layer overlapping with the second light-emitting device is substantially equal to the light-emitting wavelength of the second light-emitting device; The central reflection wavelength of the chiral liquid crystal layer overlapping the third light emitting device is substantially equal to the emission wavelength of the third light emitting device.

3. The display substrate according to claim 2, wherein: Also includes: A pixel defining layer located on a side of the chiral liquid crystal layer facing the base substrate, wherein the pixel defining layer comprises a plurality of pixel openings, and light emitting devices are disposed at the pixel openings; The orthographic projection of the chiral liquid crystal layer on the base substrate is located within the orthographic projection of the pixel opening where the light-emitting device overlapping with the chiral liquid crystal layer is located on the base substrate.

4. The display substrate according to claim 2, wherein: Also includes: A pixel defining layer located on a side of the chiral liquid crystal layer facing the base substrate, wherein the pixel defining layer comprises a plurality of pixel openings, and light emitting devices are disposed at the pixel openings; The orthographic projection of the chiral liquid crystal layer on the base substrate covers and is larger than the orthographic projection of the pixel opening where the light-emitting device overlaps with the chiral liquid crystal layer on the base substrate.

5. The display substrate according to claim 3 or 4, wherein: The percentage of the orthographic projection area of ​​the chiral liquid crystal layer on the base substrate to the orthographic projection area of ​​the overlapping pixel opening on the base substrate is positively correlated with the life decay rate of the light-emitting device overlapped with the chiral liquid crystal layer.

6. The display substrate according to claim 1, wherein: Also includes: A pixel defining layer located on a side of the chiral liquid crystal layer facing the base substrate, wherein the pixel defining layer comprises a plurality of pixel openings, and light emitting devices are disposed at the pixel openings; The orthographic projection of the chiral liquid crystal layer on the base substrate substantially coincides with the orthographic projection of the pixel opening where the light-emitting device overlaps with the chiral liquid crystal layer on the base substrate.

7. The display substrate according to any one of claims 2 to 4 and 6, wherein: The chiral liquid crystal layers overlapped with light-emitting devices of different colors have different average refractive indices and / or helical pitches.

8. The display substrate according to any one of claims 2 to 4 and 6, wherein: The chiral liquid crystal layers overlapped with the light emitting devices of different colors have the same spiral direction.

9. The display substrate according to any one of claims 1 to 4 and 6, wherein: The first light emitting device is red, the second light emitting device is green, and the third light emitting device is blue.

10. The display substrate according to any one of claims 1 to 4 and 6, wherein: The anti-reflection layer is a circular polarizer.

11. The display substrate according to claim 10, wherein: Also includes: The light absorbing layer is located between the layer where the multiple light emitting devices are located and the chiral liquid crystal layer, and the orthographic projection of the light absorbing layer on the base substrate substantially coincides with the orthographic projection of the pixel defining layer on the base substrate.

12. The display substrate according to claim 11, wherein: Also includes: A first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer are sequentially disposed on a side of the light-emitting device facing the chiral liquid crystal layer; The light absorption layer is located between the first inorganic encapsulation layer and the organic encapsulation layer, or the light absorption layer is located between the second inorganic encapsulation layer and the chiral liquid crystal layer.

13. The display substrate according to claim 11, wherein: It also includes: a touch function layer located between the layer where the light-emitting device is located and the chiral liquid crystal layer; The light absorption layer is located between the touch function layer and the chiral liquid crystal layer.

14. The display substrate according to any one of claims 3, 4 and 6, wherein: The anti-reflection layer is a color film, which includes a black matrix and a plurality of color resists separated by the black matrix; wherein, The orthographic projection of the color resist on the base substrate substantially coincides with the orthographic projection of the pixel opening on the base substrate, and the orthographic projection of the black matrix on the base substrate substantially coincides with the orthographic projection of the pixel defining layer on the base substrate.

15. The display substrate according to claim 14, wherein: The display area of ​​the display substrate includes a left frame area and a right frame area, wherein the spiral direction of the chiral liquid crystal layer in the left frame area is opposite to the spiral direction of the chiral liquid crystal layer in the right frame area, and the total number of the light-emitting devices in the left frame area is equal to the total number of the light-emitting devices in the right frame area.

16. The display substrate according to claim 15, wherein: The left frame area and the right frame area are areas on both sides of the symmetry axis of the display area in the column direction.

17. The display substrate according to claim 15, wherein: The left frame area and the right frame area are alternately arranged in a row direction and / or a column direction, and each of the left frame area or the right frame area has at least one light emitting device.

18. The display substrate according to any one of claims 1 to 4 and 6, wherein: The orthographic projection center of the chiral liquid crystal layer on the base substrate substantially coincides with the orthographic projection center of the light-emitting devices that overlap with each other.

19. A display device, wherein: Comprising the display substrate as described in any one of claims 1-18.

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