Display substrate and display device

Abstract

The invention provides a display substrate and a display device. The display substrate comprises a substrate; the light-emitting devices with various colors are arranged on the substrate in an array manner; the anti-reflection layer is located on the side, away from the substrate, of the layer where the light-emitting device is located; the chiral liquid crystal layer is 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 substrate and the orthographic projection of the light-emitting devices of at least one color on the substrate are mutually overlapped, and the central reflection wavelength of the chiral liquid crystal layer is roughly the same as the light-emitting wavelength of the light-emitting devices of at least one color overlapped with the chiral liquid crystal layer. The spiral direction of the chiral liquid crystal layer is left-handed rotation or right-handed rotation.

Description

[0001] Cross - Reference to Related Applications

[0002] This application is a divisional application. The application number of the original application is 202180002270.4, the filing date of the original application is August 25, 2021, the title of the original application is "Display Substrate and Display Device", and the entire content of the original application is incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of display technologies, and particularly to a display substrate and a display device. Background Art

[0004] In recent years, organic light-emitting displays (OLEDs) have gradually received more attention as a new type of flat panel display. Due to their excellent characteristics such as active light emission, high emission brightness, high resolution, wide viewing angle, fast response speed, small thickness, low power consumption, flexibility, wide operating temperature range, and simple structure and manufacturing process, they have broad application prospects. Summary of the Invention

[0005] The display substrate and display device provided by the embodiments of the present disclosure are specifically as follows:

[0006] On the one hand, the embodiments of the present disclosure provide a display substrate, including:

[0007] A substrate;

[0008] Light-emitting devices of multiple colors, arranged in an array on the substrate;

[0009] An antireflection layer, located on the side of the layer where the light-emitting devices are located away from the substrate;

[0010] A chiral liquid crystal layer, located between the layer where the light-emitting devices are located and the antireflection layer. The orthographic projection of the chiral liquid crystal layer on the substrate overlaps with the orthographic projection of at least one color of the light-emitting devices on the substrate. The central reflection wavelength of the chiral liquid crystal layer is approximately the same as the emission wavelength of at least one color of the light-emitting devices overlapping therewith, and the helical direction of the chiral liquid crystal layer is left-handed or right-handed.

[0011] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, the light-emitting devices include a first light-emitting device, a second light-emitting device, and a third light-emitting device with different colors. Among them, 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;

[0012] The orthographic projection of the chiral liquid crystal layer on the substrate overlaps at least with the orthographic projection of the third light-emitting device on the substrate.

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

[0014] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the positive projection of the chiral liquid crystal layer on the substrate 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 light-emitting wavelength of the third light-emitting device.

[0015] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the positive projection of the chiral liquid crystal layer on the substrate substrate overlaps with the positive projections of the second light-emitting device and the third light-emitting device on the substrate substrate, and the positive projection of the chiral liquid crystal layer on the substrate substrate does not overlap with the positive projection of the first light-emitting device on the substrate substrate;

[0016] The central reflection wavelength of the chiral liquid crystal layer overlapping with the second light-emitting device is approximately equal to the light-emitting wavelength of the second light-emitting device;

[0017] The central reflection wavelength of the chiral liquid crystal layer overlapping with the third light-emitting device is approximately equal to the light-emitting wavelength of the third light-emitting device.

[0018] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the positive projection of the chiral liquid crystal layer on the substrate substrate overlaps with the positive projections of all the light-emitting devices on the substrate substrate;

[0019] The central reflection wavelength of the chiral liquid crystal layer overlapping with the first light-emitting device is approximately equal to the light-emitting wavelength of the first light-emitting device;

[0020] The central reflection wavelength of the chiral liquid crystal layer overlapping with the second light-emitting device is approximately equal to the light-emitting wavelength of the second light-emitting device;

[0021] The central reflection wavelength of the chiral liquid crystal layer overlapping with the third light-emitting device is approximately equal to the light-emitting wavelength of the third light-emitting device.

[0022] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, it further includes: a pixel defining layer located on the side of the chiral liquid crystal layer facing the substrate, wherein the pixel defining layer includes a plurality of pixel openings, and the light-emitting devices are disposed at the pixel openings;

[0023] The orthographic projection of the chiral liquid crystal layer on the substrate is located within the orthographic projection of the pixel opening where the light-emitting device overlapping therewith is located on the substrate.

[0024] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, it further includes: a pixel defining layer located on the side of the chiral liquid crystal layer facing the substrate, wherein the pixel defining layer includes a plurality of pixel openings, and the light-emitting devices are disposed at the pixel openings;

[0025] The orthographic projection of the chiral liquid crystal layer on the substrate covers and is larger than the orthographic projection of the pixel opening where the light-emitting device overlapping therewith is located on the substrate.

[0026] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the percentage of the area of the orthographic projection of the chiral liquid crystal layer on the substrate in the area of the orthographic projection of the pixel opening where it overlaps on the substrate is negatively correlated with the lifetime decay rate of the light-emitting device overlapping with the chiral liquid crystal layer.

[0027] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, it further includes: a pixel defining layer located on the side of the chiral liquid crystal layer facing the substrate, wherein the pixel defining layer includes a plurality of pixel openings, and the light-emitting devices are disposed at the pixel openings;

[0028] The orthographic projection of the chiral liquid crystal layer on the substrate substantially coincides with the orthographic projection of the pixel opening where the light-emitting device overlapping therewith is located on the substrate.

[0029] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the average refractive index and / or pitch of the chiral liquid crystal layer overlapping with the light-emitting devices of different colors are different.

[0030] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the helical directions of the chiral liquid crystal layers overlapping with the light-emitting devices of different colors are the same.

[0031] In some embodiments, in the above-mentioned display substrate provided by 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.

[0032] 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.

[0033] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, it further includes: an absorption layer located between the layer where the plurality of light-emitting devices are located and the chiral liquid crystal layer, and a positive projection of the absorption layer on the substrate substantially coincides with a positive projection of the pixel defining layer on the substrate.

[0034] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, it further includes: a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer sequentially disposed on a side of the light-emitting device facing the chiral liquid crystal layer;

[0035] The absorption layer is located between the first inorganic encapsulation layer and the organic encapsulation layer, or the absorption layer is located between the second inorganic encapsulation 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, it further includes: a touch control function layer located between the layer where the light-emitting device is located and the chiral liquid crystal layer;

[0037] The absorption layer is located between the touch control function layer and the chiral liquid crystal layer.

[0038] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the anti-reflection layer is a color filter, and the color filter includes a black matrix and a plurality of color resistors separated by the black matrix; wherein,

[0039] A positive projection of the color resistor on the substrate substantially coincides with a positive projection of the pixel opening on the substrate, and a positive projection of the black matrix on the substrate substantially coincides with a positive projection of the pixel defining layer on the substrate.

[0040] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, a display area of the display substrate includes a left picture area and a right picture area, wherein a helical direction of the chiral liquid crystal layer in the left picture area is opposite to a helical direction of the chiral liquid crystal layer in the right picture area, and a total number of the light-emitting devices in the left picture area is equal to a total number of the light-emitting devices in the right picture area.

[0041] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the left picture area and the right picture area are respectively areas on both sides of a column direction symmetry axis of the display area.

[0042] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the left picture area and the right picture area are alternately arranged in the row direction and / or the column direction, and each of the left picture area or the right picture area has at least one of the light-emitting devices.

[0043] In some embodiments, in the above-mentioned display substrate provided by the embodiments of the present disclosure, the center of the orthographic projection of the chiral liquid crystal layer on the substrate substrate substantially coincides with the center of the orthographic projection of the overlapping light-emitting devices.

[0044] On the other hand, the embodiments of the present disclosure also provide a display device, including the above-mentioned display substrate provided by the embodiments of the present disclosure. Description of the Drawings

[0045] Figure 1 Schematic diagram of an OLED panel in the related art reflecting external natural light;

[0046] Figure 2 Schematic diagram of the structure of a circular polarizer;

[0047] Figure 3 For Figure 2 Schematic diagram of anti-reflection of the linearly polarized light layer in the circular polarizer shown;

[0048] Figure 4 For Figure 2 Schematic diagram of anti-reflection of the linearly polarized light layer combined with the quarter-wave plate layer in the circular polarizer shown;

[0049] Figure 5 Schematic diagram of a structure of the display substrate provided by the embodiments of the present disclosure;

[0050] Figure 6 For Figure 5 A cross-sectional structure schematic diagram along line I-II in

[0051] Figure 7 Schematic diagram of the display substrate provided by the embodiments of the present disclosure with a circular polarizer improving the light extraction efficiency;

[0052] Figure 8 For Figure 5 Another cross-sectional structure schematic diagram along line I-II in

[0053] Figure 9 For Figure 5 Another cross-sectional structure schematic diagram along line I-II in

[0054] Figure 10 Another schematic diagram of the structure of the display substrate provided by the embodiments of the present disclosure;

[0055] Figure 11 For Figure 5Another schematic cross-sectional structure diagram along line I-II in the middle;

[0056] Figure 12 For along Figure 5 Another schematic cross-sectional structure diagram along line I-II in the middle;

[0057] Figure 13 For along Figure 5 Another schematic cross-sectional structure diagram along line I-II in the middle;

[0058] Figure 14 For along Figure 5 Another schematic cross-sectional structure diagram along line I-II in the middle;

[0059] Figure 15 For along Figure 5 Another schematic cross-sectional structure diagram along line I-II in the middle;

[0060] Figure 16 Schematic diagram of the anti-reflection effect influenced by the display substrate with a circular polarizer provided by this disclosure;

[0061] Figure 17 For along Figure 5 Another schematic cross-sectional structure diagram along line I-II in the middle;

[0062] Figure 18 For along Figure 5 Another schematic cross-sectional structure diagram along line I-II in the middle;

[0063] Figure 19 For along Figure 5 Another schematic cross-sectional structure diagram along line I-II in the middle;

[0064] Figure 20 For along Figure 5 Another schematic cross-sectional structure diagram along line I-II in the middle;

[0065] Figure 21 For along Figure 5 Another schematic cross-sectional structure diagram along line I-II in the middle;

[0066] Figure 22 Schematic diagram of the display substrate with a color filter provided by this disclosure to improve the light extraction efficiency;

[0067] Figure 23 Anti-reflection schematic diagram of the color filter;

[0068] Figure 24 Schematic diagram of 3D polarization display in the related art;

[0069] Figure 25 Schematic diagram of the display substrate with a color filter provided by this disclosure to achieve 3D polarization display;

[0070] Figure 26 A schematic diagram of a structure of a left picture area and a right picture area in a display substrate provided by an embodiment of the present disclosure. Detailed implementation manners

[0071] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It should be noted that the sizes and shapes of the various figures in the drawings do not reflect the actual proportions, and the purpose is only to illustrate the content of the present disclosure schematically. Also, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout.

[0072] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The "first", "second", and similar terms used in the specification and claims of the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or items appearing before the term cover the elements or items listed after the term and their equivalents, without excluding other elements or items. The terms such as "inside", "outside", "above", "below", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0073] Due to the reflection of external natural light by the cathode / anode metal and the metal wires of the backplane driving circuit in the organic light-emitting display, the contrast and outdoor visibility of the screen are low, as Figure 1 shown. Therefore, in current organic light-emitting displays, an anti-reflection layer (such as a circular polarizer) is generally provided to improve this situation. As Figure 2 shown, the circular polarizer includes a glue layer, a quarter-wave plate layer, a glue layer, a triacetyl cellulose layer, a linear polarizer layer, a triacetyl cellulose layer, and a surface treatment layer stacked in sequence. The main functional layers are the linear polarizer layer and the quarter-wave plate layer, and the anti-reflection principle is as Figure 3 and Figure 4 shown. However, due to the presence of the linear polarizer layer, the transmittance of the light emitted from inside the OLED microcavity can theoretically reach a maximum of only 50%, and the actual situation is generally between 40% and 45%, resulting in a reduction in the light extraction efficiency of the OLED and an increase in power consumption.

[0074] To at least improve the above technical problems existing in the related art, an embodiment of the present disclosure provides a display substrate, as Figure 5 and Figure 6 shown, including:

[0075] A substrate 101;

[0076] Light-emitting devices 102 of multiple colors are arranged in an array on a substrate 101;

[0077] An antireflection layer 103 is located on the side of the layer where the light-emitting device 102 is located away from the substrate 101. The antireflection layer 103 can be a circular polarizer or a color film, and the color film includes a black matrix and a plurality of color resists separated by the black matrix;

[0078] A chiral liquid crystal layer 104 is located between the layer where the light-emitting device 102 is located and the antireflection layer 103. The orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 overlaps with the orthographic projection of at least one color of the light-emitting device 102 on the substrate 101. The central reflection wavelength of the chiral liquid crystal layer 104 is approximately the same as the emission wavelength of at least one color of the light-emitting device 102 arranged in an overlapping manner therewith, and the helical direction of the chiral liquid crystal layer 104 is left-handed or right-handed.

[0079] In the above display substrate provided by the embodiments 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 helical direction of the chiral liquid crystal layer 104, will the light be reflected by the chiral liquid crystal layer 104, and any band of light with a polarization direction opposite to the helical direction of the chiral liquid crystal layer 104 can directly pass through the chiral liquid crystal layer 104. Specifically, taking the antireflection layer 103 as a circular polarizer and combining with an area where a light-emitting device 102 is located as an example for illustration, as Figure 7 shown, when the light-emitting device 102 emits light (considered as natural light, which can be decomposed into equal amounts of left-handed polarized light and right-handed polarized light), assuming that the helical direction of the chiral liquid crystal layer 104 is left-handed, then the right-handed polarized light will be transmitted, and will be changed into linearly polarized light through the quarter-wave plate layer 1032 in the circular polarizer, and then normally exit after passing through the linear polarizer layer 1031. 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 underlying film layer, there is no half-wave loss. This left-handed polarized light will return to the film layer where the light-emitting device 102 is located, and will become right-handed polarized light after being reflected on the metal electrode (there is half-wave loss here), and then pass through the circular polarizer and exit. Thus, the chiral liquid crystal layer 104 can improve the light extraction efficiency of the light-emitting device 102 whose emission wavelength is the same as its central reflection wavelength. Based on this, by respectively arranging chiral liquid crystal layers with corresponding central reflection wavelengths above different color light-emitting devices 102, the overall light extraction efficiency of the display substrate can be maximized, and the power consumption can be significantly reduced.

[0080] It should be noted that in the embodiments provided by the present disclosure, due to the limitations of process conditions or the influence of other factors such as measurement, "approximately" may be exactly equal or there may be some deviations. Therefore, as long as the "approximate" relationship between relevant features meets the allowable error (for example, a 10% fluctuation up and down), it belongs to the protection scope of the present disclosure.

[0081] For OLED displays, long-term image retention (burn-in) defects may occur after a long period of screen-on. The areas with long-term image retention mainly have differences in brightness and chromaticity compared to the surrounding areas. The brightness difference stems from the brightness attenuation of different color-emitting materials, while the chromaticity difference results from the unequal brightness attenuation of different color-emitting devices 102. Currently, in general, the lifespan of red-emitting devices > the lifespan of green-emitting devices > the lifespan of blue-emitting devices, and many polarizers also have the problem that the transmittance of red and green light > the transmittance of blue light. This causes the white screen to turn yellow after being lit for a long time. To address this issue, a common approach is to increase the aperture ratio of blue-emitting devices, such that the aperture ratio of blue-emitting devices > the aperture ratio of green-emitting devices > the aperture ratio of red-emitting devices, so as to make the lifespans of red-emitting devices, blue-emitting devices, and green-emitting devices as equal as possible. Especially for application scenarios with long lifespan requirements, such as in-vehicle and laptop computers, the aperture ratio of blue-emitting devices should be much larger than the aperture ratio of red-emitting devices and the aperture ratio of green-emitting devices. However, such a design also brings other drawbacks, such as affecting the routing of the backplane wiring and the overall aperture ratio, etc.

[0082] To solve the above technical problem of the unequal lifespans of different color-emitting devices 102, in the above display substrate provided by the embodiments of the present disclosure, as Figure 8 shown, the light-emitting device 102 may include a first light-emitting device R (e.g., a red light-emitting device), a second light-emitting device G (e.g., a green light-emitting device), and a third light-emitting device B (e.g., a blue light-emitting device) with different colors. Among them, the lifespan decay rate of the first light-emitting device R, the lifespan decay rate of the second light-emitting device G, and the lifespan decay rate of the third light-emitting device B increase in sequence; the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 at least overlaps with the orthographic projection of the third light-emitting device B on the substrate 101.

[0083] By disposing the chiral liquid crystal layer 104 above the third light-emitting device B with the greatest degree of lifespan decay, 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. Furthermore, the aging of the light-emitting material in the third light-emitting device B can be improved, and the lifespan of the third light-emitting device B can be extended, such that the lifespan differences among the first light-emitting device R, the second light-emitting device G, and the third light-emitting device B are small, or even negligible, effectively improving the problem of unequal lifespans of different color-emitting devices 102.

[0084] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 8As shown, the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 may 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 lifespan of the third light-emitting device B with the maximum lifespan decay rate can be improved through the chiral liquid crystal layer 104, the lifespan 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 lifespans of the first light-emitting device R, the second light-emitting device G, and the third light-emitting device B can be improved.

[0085] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 5 and Figure 9 shown, the orthographic projection of the chiral liquid crystal layer 104 on the 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 approximately 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 approximately 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 helical direction as the chiral liquid crystal layer 104, while the polarized light in the light rays of the first light-emitting device R, the second light-emitting device G, and the third light-emitting device B with the helical direction opposite to the chiral liquid crystal layer 104 can directly pass through without being affected. Optically on the panel, it is reflected as an increase in the light extraction efficiency of the third light-emitting device B, improving the lifespan of the third light-emitting device B. And since the chiral liquid crystal layer 104 is provided as a whole surface, therefore, compared with Figure 8 the scheme shown in which the chiral liquid crystal layer 104 is only provided above the third light-emitting device B, one mask process can be omitted, and the process is relatively simple.

[0086] It should be noted that, in some embodiments, as Figure 5 shown, when the display substrate provided by the embodiments of the present disclosure is a full-screen display, the area of the display area AA is substantially the same as the area of the surface of the substrate 101 facing the light-emitting device 102. Therefore, the orthographic projection of the chiral liquid crystal layer 104 on the 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 provided as a whole surface. In other embodiments, as Figure 10 shown, the display substrate provided by the embodiments of the present disclosure may include a display area AA and a border area BB. Then, the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 at least completely covers the display area AA of the display substrate, and the following two schemes may be included: First, the chiral liquid crystal layer 104 is only provided in the display area AA; Second, the chiral liquid crystal layer 104 is provided in both the display area AA and the border area BB, that is, the chiral liquid crystal layer 104 is provided as a whole surface.

[0087] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, in order to further balance the lifetimes of different color light-emitting devices 102, as Figure 11 shown, the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 overlaps with the orthographic projection 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 emission wavelength of the second light-emitting device G, so as to improve the light extraction efficiency of the second light-emitting device G through the chiral liquid crystal layer 104 and extend the lifetime of the second light-emitting device G; the central reflection wavelength of the chiral liquid crystal layer 104 overlapping with the third light-emitting device B is approximately equal to the emission wavelength of the third light-emitting device B, so as to improve the light extraction efficiency of the second light-emitting device G through the chiral liquid crystal layer 104 and extend the lifetime of the second light-emitting device G.

[0088] 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 of the solvent → ultraviolet (UV) curing. Among them, the material of the alignment layer can be polyimide (PI), and this material can be cured into a film at low temperature, specifically, it can be limited to below 95°C. And the chiral liquid crystal layer 104 above the second light-emitting device G and the third light-emitting device B can be fabricated through two patterning processes respectively. 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 (only including the three steps of "coating the chiral liquid crystal material → low-temperature drying of the solvent → UV curing" here) can be made, and at the same time, photoresist (PR) can be used to protect the chiral liquid crystal layer 104 above the previously fabricated second light-emitting device G.

[0089] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 12As shown, the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 overlaps with the orthographic projection of all the light-emitting devices 102 on the substrate 101; the central reflection wavelength of the chiral liquid crystal layer 104 overlapping with the first light-emitting device R is approximately equal to the emission wavelength of the first light-emitting device R; the central reflection wavelength of the chiral liquid crystal layer 104 overlapping with the second light-emitting device G is approximately equal to the emission wavelength of the second light-emitting device G; the central reflection wavelength of the chiral liquid crystal layer 104 overlapping with the third light-emitting device B is approximately equal to the emission wavelength of the third light-emitting device B. Thus, the light extraction efficiency of the corresponding color light-emitting devices 102 can be respectively improved 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 respectively fabricated through three patterning processes.

[0090] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 8 , Figure 11 and Figure 12 shown, it may further include: a pixel defining layer 105 on the side of the chiral liquid crystal layer 104 facing the 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 disposed at the pixel opening; the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 may be located within the orthographic projection of the pixel opening where the light-emitting device 102 overlapping therewith is located on the substrate 101, that is, the ratio of the orthographic projection area of the chiral liquid crystal layer 104 to the pixel opening below it is less than 1; or, as Figure 13 shown, the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 substantially coincides with the orthographic projection of the pixel opening where the light-emitting device 102 overlapping therewith is located on the substrate 101, that is, the ratio of the orthographic projection area of the chiral liquid crystal layer 104 to the pixel opening below it is substantially 1, so as to effectively improve the front-view light extraction efficiency of the light-emitting device 102. Of course, in specific implementation, as Figure 14 and Figure 15 shown, the orthographic projection of the chiral liquid crystal layer 104 on the substrate 101 covers and is larger than the orthographic projection of the pixel opening where the light-emitting device 102 overlapping therewith is located on the substrate 101, that is, the ratio of the orthographic projection area of the chiral liquid crystal layer 104 to the pixel opening below it is greater than 1. Specifically, there is a gap between the chiral liquid crystal layers 104 above the light-emitting devices 102 of different colors in Figure 12 , and in Figure 15The chiral liquid crystal layers 104 above the light-emitting devices 102 of different colors are in contact with each other to simultaneously improve the light extraction efficiency of the light-emitting devices 102 at the normal viewing angle and the oblique viewing angle. It should be noted that the areas of the chiral liquid crystal layers 104 above the light-emitting devices 102 of different colors exceeding the pixel openings below them (i.e., the overlapping areas with the pixel defining layer 105) can be the same or different, and no specific limitation is made here.

[0091] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 12 and Figure 14 shown, the percentage of the orthographic projection area of the chiral liquid crystal layer 104 on the substrate substrate 101 in the orthographic projection area of the pixel opening where it is overlapped on the substrate substrate 101 is negatively correlated with the lifetime decay rate of the light-emitting device 102 overlapped with the chiral liquid crystal layer 104. The larger the overlapping area between the chiral liquid crystal layer 104 and the pixel opening below it, the more obvious the improvement effect on the light extraction efficiency of the light-emitting device 102 at the pixel opening. Therefore, the above setting method can not only improve the light extraction efficiency of the light-emitting devices 102 of different colors, but also make the lifetimes of the light-emitting devices 102 of different colors almost the same.

[0092] In some embodiments, since the lifetime 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 orthographic projection area of the chiral liquid crystal layer 104 above the second light-emitting device G to the pixel opening where the second light-emitting device G is located is greater than the ratio of the orthographic projection area of the chiral liquid crystal layer 104 above the first light-emitting device R to the pixel opening where the first light-emitting device R is located, and less than the ratio of the orthographic projection area of the chiral liquid crystal layer 104 above the third light-emitting device B to the pixel opening where the third light-emitting device B is located. Optionally, the ratio of the orthographic projection area of the chiral liquid crystal layer 104 above the third light-emitting device B to the pixel opening where the third light-emitting device B is located is 95% - 100%; the ratio of the orthographic projection area of the chiral liquid crystal layer 104 above the second light-emitting device G to the pixel opening where the second light-emitting device G is located is 85% - 95%; the ratio of the orthographic projection area of the chiral liquid crystal layer 104 above the first light-emitting device R to the pixel opening where the first light-emitting device R is located is 70% - 85%.

[0093] 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 relational expressions: λ 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 avgn is the average refractive index of the chiral liquid crystal layer 104, P is the pitch of the chiral liquid crystal layer 104, △λ is the spectral width of the central reflection wavelength of the chiral liquid crystal layer 104, and △n is the difference between the ordinary light refractive index and the extraordinary light refractive index of the chiral liquid crystal layer 104. Therefore, by adjusting the average refractive index and / or pitch of the chiral liquid crystal layer 104 above different color light-emitting devices 102, the central reflection wavelength of the chiral liquid crystal layer 104 above different color light-emitting devices 102 can be obtained. That is to say, the average refractive index and / or pitch of the chiral liquid crystal layer 104 overlapping with different color light-emitting devices 102 are different.

[0094] In some embodiments, the average refractive index n of the chiral liquid crystal layer 104 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 (such as the red light-emitting device 102) can be (620 ± 30) nm, the central reflection wavelength of the chiral liquid crystal layer 104 above the second light-emitting device G (such as the green light-emitting device 102) can be (530 ± 30) nm, and the central reflection wavelength of the chiral liquid crystal layer 104 above the third light-emitting device B (such as the blue light-emitting device 102) can be (450 ± 30) nm.

[0095] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, the helical directions of the chiral liquid crystal layers 104 overlapping with different color light-emitting devices 102 are the same. In other words, the helical directions of the chiral liquid crystal layers 104 above different color light-emitting devices 102 can be both left-handed or both right-handed.

[0096] However, although the chiral liquid crystal layer 104 in the present disclosure can improve the light extraction efficiency of internal light, when the antireflection layer 103 is a circular polarizer, the chiral liquid crystal layer 104 will have a negative effect on the antireflection reduction of the circular polarizer, such as Figure 16 As shown in the optical path, after the external natural light passes through the linear polarizer layer 1031 in the circular polarizer, half of the light is absorbed and becomes linearly polarized light. After the polarization direction of this part of the light is changed by the metal interface, since it cannot pass through the chiral liquid crystal layer 104, it is reflected back and forth between the chiral liquid crystal layer 104 and the metal electrode, and finally penetrates the circular polarizer and exits. This result will increase the reflectivity of the display screen and affect the display effect.

[0097] Based on this, in order to improve the antireflection reduction effect, in the above display substrate provided by the embodiments of the present disclosure, as Figure 17As shown, it may further include: a light absorption layer 109 located between the layer where the plurality of light-emitting devices 102 are located and the chiral liquid crystal layer 104. The orthographic projection of the light absorption layer 109 on the substrate 101 substantially coincides with the orthographic projection of the pixel defining layer 105 on the substrate 101. The light absorption layer 109 is used to absorb the external light incident into the display substrate, thereby preventing it from being reflected back to the outside by the metal electrodes. In some embodiments, the light absorption layer 109 may be made of a black matrix material.

[0098] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 17 and Figure 18 shown, it may further 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 absorption layer 109 is located between the first inorganic encapsulation layer 106 and the organic encapsulation layer 107, or the light absorption layer 109 is located between the second inorganic encapsulation layer 108 and the chiral liquid crystal layer 104. In some embodiments, as Figure 19 shown, the display substrate may further include a touch control function layer 110 between the layer where the light-emitting device 102 is located and the chiral liquid crystal layer 104; the light absorption layer 109 is located between the touch control 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 layer positions shown.

[0099] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 20 shown, it may further include a first adhesive layer 111 in contact with the surface of the chiral liquid crystal layer 104 facing the substrate 101, and a second adhesive layer 112 in contact with the surface of the circularly polarized light sheet facing away from the substrate 101, so as to fix the chiral liquid crystal layer 104 on the first flat layer 113 for reducing the step difference through the first adhesive layer 111, and fix the circularly polarized light sheet 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, as Figure 18 shown, the chiral liquid crystal layer 104 may also be directly fabricated on the first flat layer 113, and each film layer of the circularly polarized light sheet may be directly fabricated on the chiral liquid crystal layer 104, which is not specifically limited herein.

[0100] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 21 and Figure 22As shown, the antireflection layer 103 may be a color film 103', which includes a plurality of color filters 1033 and a black matrix 1034. Each of the color filters 1033 is arranged separately by the black matrix 1034. The orthographic projection of the color filter 1033 on the substrate 101 substantially coincides with the orthographic projection of the pixel aperture 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. To improve color purity, it is preferred that the orthographic projection of the color filter 1033 on the substrate 101 is slightly larger than the orthographic projection of the pixel aperture on the substrate 101. 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.

[0101] Specifically, taking the area where a light-emitting device 102 is located as an example for illustration, as Figure 22 shown, when the light-emitting device 102 emits light (considered as 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 exit normally through the color filter 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 underlying film layer and there is no half-wave loss, this left-handed polarized light will return to the film layer where the light-emitting device 102 is located, be reflected on the metal electrode (there is half-wave loss here) and then become right-handed polarized light, and then exit in the same way. Thus, the chiral liquid crystal layer 104 can improve the light extraction efficiency of the light-emitting device 102 whose emission wavelength is the same as its central reflection wavelength. Based on this, by respectively arranging chiral liquid crystal layers with corresponding central reflection wavelengths above different color light-emitting devices 102, 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 filter 1033, the first planarization 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.

[0102] In some embodiments, the color filter 1033 may include a red color filter located above the red light-emitting device (R), a green color filter located above the green light-emitting device (G), and a blue color filter located above the blue light-emitting device (B).

[0103] In addition, as Figure 23As shown, the transmittance of the circular polarizer is generally between 40% and 45%, while the color film 103’ (color filter on encapsulation, COE) composed of the color resist 1033 and the black matrix 1034 fabricated on the encapsulation layer can reach 60% according to the simulated transmittance, which is a significant improvement compared to 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.

[0104] The existing 3D display methods are mainly divided into two types: glasses-type and naked-eye type. Among them, the glasses-type uses polarized 3D technology, which has the smallest color loss, the color display is closest to the original value, the 3D display effect is relatively prominent, and the stereoscopic feeling is real. The existing polarized 3D technology sets linear polarizers with mutually perpendicular absorption axes on the left and right glasses to respectively receive linearly polarized light in two vibration directions, thereby realizing 3D display in the human brain.

[0105] However, there is an obvious problem with using linearly polarized light to achieve 3D display. When the lines of sight of 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 very difficult for the viewer to maintain a completely upright head position for a long time. Therefore, the use of linear polarization 3D technology cannot meet the needs of comfortable movie watching.

[0106] The current improvement solution is to adopt circular polarization 3D technology. This technology adds a circular polarizer in front of the screen or the projector lens, so that the light emitted by the screen or the projector is circularly polarized light. Among them, the left and right frames respectively 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 respectively to correspond to the circular polarizers of the two rotation directions. The specific structure is as Figure 24 shown.

[0107] The advantage of this setting 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 skew of the glasses position. That is to say, changes in the posture (relative angle with the screen) and position during movie watching will have no impact on the 3D effect.

[0108] However, such a principle is difficult to apply to OLED displays. First of all, due to the need for anti-reflection reduction, OLED needs to attach a circular polarizer. Its structure and anti-reflection reduction principle are shown in Figure 4, since the linear polarizer is located on the top layer, the light finally emitted by the OLED is linearly polarized light, and at least half of the light emitted by the OLED is absorbed in this process. If, on this basis, a quarter-wave plate layer is attached to the screen to convert the linearly polarized light into circularly polarized light for 3D display, the brightness of the left and right frames will be halved again, resulting in insufficient brightness during the final viewing or extremely high power consumption of the display screen.

[0109] As Figure 25 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 pass through the chiral liquid crystal layer 104 and be emitted as left-handed polarized light or right-handed polarized light, thereby improving the light extraction efficiency. And since the color resistor 1033, the first planarization 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, it can cooperate with the circular polarizers respectively attached to the left and right glasses to achieve a 3D effect, and changes in the posture (relative angle with the screen) and position during the viewing process will have no impact on the 3D effect.

[0110] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 26 shown, the display area of the display substrate includes a left frame area and a right frame area. Among them, the helical direction of the chiral liquid crystal layer 104 in the left frame area is opposite to the helical 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 improve the viewing experience while achieving a 3D effect.

[0111] Optionally, the helical direction of the chiral liquid crystal layer 104 in the left frame area can be left-handed, so that the emitted light of the light-emitting device 102 becomes right-handed polarized light after passing through the chiral liquid crystal layer 104; the helical direction of the chiral liquid crystal layer 104 in the right frame area can be right-handed, so that the emitted light of the light-emitting device 102 becomes left-handed polarized light after passing through the chiral liquid crystal layer 104; or, the helical direction of the chiral liquid crystal layer 104 in the right frame area can be left-handed, so that the emitted light of the light-emitting device 102 becomes right-handed polarized light after passing through the chiral liquid crystal layer 104; the helical direction of the chiral liquid crystal layer 104 in the left frame area can be right-handed, so that the emitted light of the light-emitting device 102 becomes left-handed polarized light after passing through the chiral liquid crystal layer 104.

[0112] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 26As shown, the left frame area and the right frame area are respectively the areas on both sides of the symmetry axis of the display area in the column direction; alternatively, 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 arrangement methods of the left frame area and the right frame area well-known to those skilled in the art can also be adopted, which are not limited herein.

[0113] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, the center of the orthographic projection of the chiral liquid crystal layer 104 on the substrate substrate 101 substantially coincides with the center of the orthographic projection of the overlapping light-emitting devices 102, so that the viewing angle brightness attenuation and color shift at each azimuth angle are kept consistent.

[0114] In the present disclosure, the center of the orthographic projection 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 0 μm - 1 μm; the center of the orthographic projection 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 0 μm - 1 μm.

[0115] In some embodiments, in the above display substrate provided by the embodiments of the present disclosure, as Figure 21 shown, in order to reduce the step difference, a second planarization layer 113' covering the chiral liquid crystal layer 104 can be provided. In addition, in order to reduce the step difference, a third planarization layer 113'' can also be provided above the color resistor 1033. Generally, the display substrate may further include a driving circuit layer 115 for driving the light-emitting device 102 to emit light. Other essential components of the display substrate are understood by those of ordinary skill in the art and will not be elaborated herein, nor should they be regarded as a limitation to the present disclosure.

[0116] Based on the same inventive concept, the embodiments of the present disclosure provide a display device, including the above display substrate provided by the embodiments of the present disclosure. Since the principle of solving problems of this display device is similar to that of the above display substrate, therefore, the implementation of this display device provided by the embodiments of the present disclosure can refer to the implementation of the above display substrate provided by the embodiments of the present disclosure, and the repeated parts will not be elaborated.

[0117] 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 monitor, 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: 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, etc. In addition, those skilled in the art can understand that the above structure does not constitute a limitation on the above display device provided by the embodiments of the present disclosure. In other words, the above display device provided by the embodiments of the present disclosure may include more or fewer of the above components, or combine certain components, or arrange different components.

[0118] Although the preferred embodiments of the present disclosure have been described, those skilled in the art can 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 equivalent technologies, the present disclosure also intends to include these changes and modifications.

Claims

1. A display substrate, characterized in that, 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; Wherein, the light-emitting device comprises a first light-emitting device, a second light-emitting device and a third light-emitting device of different colors, and 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 base substrate overlaps with the orthographic projection of at least one of the first light-emitting device and the second light-emitting device on the base 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 projections of all the light-emitting devices on the base substrate; 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; 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 light 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, characterized in that 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 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 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 1-4 and 6, characterized in that, 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 1-4 and 6, characterized in that 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 2-4 and 6, characterized in that The first light-emitting device is a red light-emitting device, the second light-emitting device is a green light-emitting device, and the third light-emitting device is a blue light-emitting device.

10. The display substrate according to any one of claims 1-4 and 6, characterized in that, The antireflection layer is a circular polarizer.

11. The display substrate according to claim 10, wherein, Further comprising: An absorbent layer located between the layer where the plurality of light-emitting devices are located and the chiral liquid crystal layer, and the orthographic projection of the absorbent layer on the substrate substantially coincides with the orthographic projection of the pixel defining layer on the substrate.

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

13. The display substrate according to claim 11, characterized in that, Further comprising: a touch control function layer located between the layer where the light-emitting device is located and the chiral liquid crystal layer; The absorbent layer is located between the touch control function layer and the chiral liquid crystal layer.

14. The display substrate according to any one of claims 2-4 and 6, characterized in that, The antireflection layer is a color film, the color film includes a black matrix, and a plurality of color filters separated by the black matrix; wherein, The orthographic projection of the color filter on the substrate substantially coincides with the orthographic projection of the pixel opening on the substrate, and the orthographic projection of the black matrix on the substrate substantially coincides with the orthographic projection of the pixel defining layer on the substrate.

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

16. The display substrate according to claim 15, characterized in that, The left picture area and the right picture area are respectively regions 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 picture area and the right picture area are alternately arranged in the row direction and / or the column direction, and each left picture area or right picture area has at least one light-emitting device.

18. The display substrate according to any one of claims 1-4 and 6, characterized in that The center of the orthographic projection of the chiral liquid crystal layer on the substrate substantially coincides with the center of the orthographic projection of the overlapping light-emitting devices.

19. A display device, characterized in that, Comprising the display substrate according to any one of claims 1-18.

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