Light-emitting device, preparation method thereof and display panel

Abstract

The invention provides a light-emitting device and a preparation method thereof, and a display panel, and relates to the technical field of display, the light-emitting device comprises a substrate and a light-emitting layer arranged on one side of the substrate; the first polarization layer is arranged on the side, close to the substrate, of the light-emitting layer, the first polarization layer comprises a plurality of first polarization units, each first polarization unit comprises a first part away from the side of the light-emitting layer and a second part close to the side of the light-emitting layer, and the section shapes of the first parts and the second parts along the plane perpendicular to the substrate are different; and the second polarized light layer comprises a polarized light sub-layer, the polarized light sub-layer is arranged on the side, away from the substrate, of the light-emitting layer, or the polarized light sub-layer is arranged on the side, close to the substrate, of the light-emitting layer, the polarized light sub-layer comprises a plurality of second polarized light units, and the arrangement direction of the second polarized light units is different from that of the first polarized light units.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of display technologies, and more particularly, to a light-emitting device, a method for manufacturing the same, and a display panel. Background Art

[0002] The manufacturing size of LEDs (light-emitting diodes) has a trend of becoming increasingly miniaturized. In recent years, it has become possible to fabricate a display substrate with a Micro LED (micro light-emitting diode) array arrangement as pixels. Compared with OLEDs (organic light-emitting diodes), LEDs have an absolute advantage in terms of reliability and lifespan. Among them, as a next-generation advanced display technology, Micro LED display devices have extremely high brightness and small chip sizes that are difficult to replace. Therefore, Micro LED display technology is a new type of display technology that will surpass OLED display technology in the future. Summary of the Invention

[0003] Embodiments of the present application adopt the following technical solutions:

[0004] In a first aspect of the embodiments of the present application, a light-emitting device is provided. The light-emitting device includes:

[0005] a substrate, and a light-emitting layer disposed on one side of the substrate;

[0006] a first polarization layer, the first polarization layer is disposed on the side of the light-emitting layer close to the substrate. Among them, the first polarization layer includes a plurality of first polarization units, and each first polarization unit includes a first part on the side away from the light-emitting layer and a second part on the side close to the light-emitting layer, and the cross-sectional shapes of the first part and the second part in a plane perpendicular to the substrate are different;

[0007] a second polarization layer, the second polarization layer includes a photon polarization sub-layer. The photon polarization sub-layer is disposed on the side of the light-emitting layer away from the substrate, or the photon polarization sub-layer is disposed on the side of the light-emitting layer close to the substrate. The photon polarization sub-layer includes a plurality of second polarization units, and the arrangement directions of the plurality of second polarization units are different from those of the plurality of first polarization units.

[0008] In an optional implementation manner, the first polarization layer includes:

[0009] a first grating, the first grating includes a plurality of the first polarization units arranged at intervals in a first direction. The plurality of first polarization units are disposed close to the light-emitting layer, and there is a gap between adjacent two first polarization units;

[0010] a first filling layer, the first filling layer is disposed on the side of the first grating away from the light-emitting layer, and the first filling layer fills the gaps between the plurality of first polarization units.

[0011] In an alternative embodiment, the first part is configured to be able to transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light; the second part is configured to be able to reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer.

[0012] In an alternative embodiment, the first part includes a first side surface, a second side surface, and a third side surface that intersect pairwise. The first side surface is parallel to and in contact with one side of the second part away from the light-emitting layer; the second side surface and the third side surface are disposed opposite to each other, and the orthographic projections of the second side surface and the third side surface on the substrate are three parallel lines.

[0013] In an alternative embodiment, the first part includes a first side surface and a second arc surface. The first side surface is parallel to and in contact with one side of the second part away from the light-emitting layer; the two ends of the second arc surface intersect with the opposite ends of the first side surface, and the second arc surface protrudes in a direction away from the second part.

[0014] In an alternative embodiment, the first part includes a first side surface and a plurality of second side surfaces. The first side surface is parallel to and in contact with one side of the second part away from the light-emitting layer; adjacent two side surfaces among the plurality of second side surfaces intersect and are disposed opposite to each other, and the orthographic projections of the plurality of second side surfaces on the substrate are multiple straight lines.

[0015] In an alternative embodiment, the second part includes a fourth side surface, a fifth side surface, a sixth side surface, and a seventh side surface. The fourth side surface and the fifth side surface are parallel to and opposite to each other. The sixth side surface and the seventh side surface are parallel to and opposite to each other. The sixth side surface is perpendicular to the fourth side surface; wherein, the fourth side surface or the sixth side surface is parallel to and in contact with the first part.

[0016] In an alternative embodiment, the grating period width of the first grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width of the first polarization unit along the first direction is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the first polarization unit along the direction perpendicular to the first direction is greater than or equal to 0.01 μm and less than or equal to 10 μm.

[0017] In an alternative embodiment, the material of the first part is a metal material, a dielectric material, or a visible light absorbing material; the material of the second part is a metal material or a dielectric material.

[0018] In an alternative embodiment, the second polarizing layer further includes a reflective sub-layer disposed on a side of the light-emitting layer facing away from the substrate; the second polarizing layer is configured to modulate the phase of light to achieve mutual conversion between a second type of polarized light and a first type of polarized light.

[0019] In an alternative embodiment, the polarizing sub-layer includes:

[0020] A second grating including a plurality of the second polarizing units arranged at intervals in a second direction, the plurality of second polarizing units being disposed close to the light-emitting layer, and there being a gap between two adjacent second polarizing units, the second direction intersecting a first direction, the first direction being the direction in which the plurality of first polarizing units are arranged;

[0021] A second filling layer disposed on a side of the second grating facing away from the light-emitting layer, and the second filling layer fills the gaps between the plurality of second polarizing units.

[0022] In an alternative embodiment,

[0023] The second polarizing unit is configured to reflect at least one of a first component of the first type of polarized light, a first component of the second type of polarized light, and a first component of the first type of polarized light and a first component of the second type of polarized light, and transmit at least one of a second component of the first type of polarized light, a second component of the second type of polarized light, and a second component of the first type of polarized light and a second component of the second type of polarized light;

[0024] The reflective sub-layer is configured to reflect a first component and a second component of the first type of polarized light and / or the second type of polarized light.

[0025] In an alternative embodiment, the grating period width of the second grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width of the second polarizing unit in the second direction is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the second polarizing unit in a direction perpendicular to the second direction is greater than or equal to 0.01 μm and less than or equal to 10 μm.

[0026] In an alternative embodiment, the light-emitting device further includes a filter layer disposed between the first polarizing layer and the light-emitting layer, wherein the filter layer is a first filter layer or a second filter layer, the first filter layer is a single-layer color film filter or a plasma resonance filter; the second filter layer includes two stacked reflective structures and a patterned layer disposed between the two reflective structures.

[0027] In an alternative embodiment, each of the first polarizing units includes a plurality of first polarizing sub-units spaced apart along the length direction of the first polarizing unit. The first polarizing sub-unit has a columnar structure, and the orthographic projection of the first polarizing sub-unit on the substrate is a polygon or an arc.

[0028] In a second aspect of the embodiments of the present application, a display panel is provided, which includes:

[0029] a substrate; and

[0030] a plurality of light-emitting devices as described in any one of the first aspect, provided on one side of the substrate; wherein, the plurality of light-emitting devices include light-emitting devices that emit light of different colors.

[0031] In an alternative embodiment, the grating parameters of the first polarizing layer and / or the second polarizing layer in the light-emitting devices that emit light of different colors are different. The grating parameters include at least one of the following: the number of polarizing units, the grating period width of the grating, the width of each polarizing unit along the arrangement direction of the polarizing units, and the width of each polarizing unit along the direction perpendicular to the arrangement direction of the polarizing units.

[0032] In a third aspect of the embodiments of the present application, a method for manufacturing a light-emitting device is provided, which includes:

[0033] providing a substrate;

[0034] forming a light-emitting layer on one side of the substrate;

[0035] forming a first polarizing layer on the side of the light-emitting layer close to the substrate, wherein the first polarizing layer includes a plurality of first polarizing units, and each first polarizing unit includes a first part on the side away from the light-emitting layer and a second part on the side close to the light-emitting layer, and the cross-sectional shapes of the first part and the second part along the plane perpendicular to the substrate are different;

[0036] forming a second polarizing layer, the second polarizing layer includes a polarizing sub-layer, the polarizing sub-layer is disposed on the side of the light-emitting layer away from the substrate, or the polarizing sub-layer is disposed on the side of the light-emitting layer close to the substrate, the polarizing sub-layer includes a plurality of second polarizing units, and the arrangement directions of the plurality of second polarizing units are different from those of the plurality of first polarizing units.

[0037] The above description is only an overview of the technical solutions of the present disclosure. In order to be able to understand the technical means of the present disclosure more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present disclosure more obvious and understandable, the specific embodiments of the present disclosure are specifically exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or related technologies. Obviously, the accompanying drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic diagram of the hierarchical structure of a light-emitting device proposed in an embodiment of the present application;

[0040] Figure 2 It is an example of a partial cross-section of the first polarization layer in the first grating on a plane perpendicular to the substrate in an embodiment of the present application;

[0041] Figure 3 It is an example of the orthographic projection of the first grating in the first polarization layer on the substrate in an embodiment of the present application;

[0042] Figure 4 It is a schematic diagram of the shapes of the first part and the second part of a first polarization unit proposed in an embodiment of the present application;

[0043] Figure 5 It is a schematic diagram of the shapes of the first part and the second part of another first polarization unit proposed in an embodiment of the present application;

[0044] Figure 6a It is a schematic diagram of the cross-section along a plane perpendicular to the substrate of the second part of the first polarization unit and the grating parameters in an embodiment of the present application;

[0045] Figure 6b It is a schematic diagram of the cross-section of the elliptical composite pattern along a plane perpendicular to the substrate of the first polarization unit and the grating parameters in an embodiment of the present application;

[0046] Figure 6c It is a schematic diagram of the cross-section of the triangular composite pattern along a plane perpendicular to the substrate of the first polarization unit and the grating parameters in an embodiment of the present application;

[0047] Figure 6d It is a schematic diagram of the cross-section of the irregular composite pattern along a plane perpendicular to the substrate of the first polarization unit and the grating parameters in an embodiment of the present application;

[0048] Figure 6e It is a schematic diagram of the cross-section of the elliptical composite pattern along a plane perpendicular to the substrate of the first polarization unit when the first part is a visible light absorbing material and the grating parameters in an embodiment of the present application;

[0049] Figure 7a It is a schematic diagram of the component of the polarization state of the incident light entering obliquely to the right in an embodiment of the present application;

[0050] Figure 7b It is a schematic diagram of the components of the polarization state of the light reflected by the second polarizing layer proposed in an embodiment of the present application;

[0051] Figure 8 It is a schematic diagram of the optical path transmission of a light-emitting device based on the first polarizing layer and the second polarizing layer proposed in an embodiment of the present application;

[0052] Figure 9 It is a red light efficiency curve diagram of a light-emitting device provided with a filter layer proposed in an embodiment of the present application;

[0053] Figure 10 It is a schematic diagram of the hierarchical structure in which the first polarizing layer and the polarizing sub-layer in a light-emitting device are arranged on the same side of the substrate proposed in an embodiment of the present application;

[0054] Figure 11 It is a schematic diagram of the orientation of the first grating and the second grating proposed in an embodiment of the present application;

[0055] Figure 12a It is a curve diagram of the reflectivity and transmittance of different polarized lights of the second part of the first polarizing unit in a red light-emitting device proposed in an embodiment of the present application;

[0056] Figure 12b It is a curve diagram of the reflectivity and transmittance of different polarized lights of the first part of the first polarizing unit in a red light-emitting device proposed in an embodiment of the present application;

[0057] Figure 13 It is a curve diagram of the polarization conversion efficiency of the second polarizing layer in a red light-emitting device proposed in an embodiment of the present application;

[0058] Figure 14 It is an example diagram of gratings of different color light-emitting chips in an RGB display panel proposed in an embodiment of the present application;

[0059] Figure 15 It is a flow chart of the optimized design of grating parameters of different color light-emitting chips in an RGB display panel proposed in an embodiment of the present application;

[0060] Figure 16 It is a schematic diagram of the second filter layer corresponding to the RGB light-emitting device of a display panel provided in an embodiment of the present application;

[0061] Figure 17 It is a schematic diagram of the structure of the second filter layer corresponding to the RGB light-emitting device of a display panel respectively provided in an embodiment of the present application;

[0062] Figure 18aIt is a schematic diagram of a hierarchical structure for annealing an electrode layer in a method for manufacturing a light-emitting device according to an embodiment of the present application;

[0063] Figure 18b It is a schematic diagram of a hierarchical structure for forming a second grating in a method for manufacturing a light-emitting device according to an embodiment of the present application;

[0064] Figure 18c It is a schematic diagram of a hierarchical structure for forming a second filling layer in a method for manufacturing a light-emitting device according to an embodiment of the present application;

[0065] Figure 18d It is a schematic diagram of a hierarchical structure for forming a reflective sub-layer in a method for manufacturing a light-emitting device according to an embodiment of the present application;

[0066] Figure 18e It is a schematic diagram of a hierarchical structure for forming a first polarization layer on a bonding substrate in a method for manufacturing a light-emitting device according to an embodiment of the present application;

[0067] Figure 18f It is a schematic diagram of a hierarchical structure for bonding a bonding substrate and a light-emitting layer in a method for manufacturing a light-emitting device according to an embodiment of the present application;

[0068] Figure 19 It is a schematic diagram of the structure of a first polarization sub-unit proposed in an embodiment of the present application.

[0069] Explanation of reference numerals: 1. Substrate; 11. Substrate; 12. Light-emitting layer; 121. Buffer layer; 122. First semiconductor layer; 123. Active layer; 124. Second semiconductor layer; 13. First polarization layer; 131. First polarization unit; 1311. First part; 1312. Second part; 131-1. First polarization sub-unit; 132. First filling layer; 14. Second polarization layer; 141. Polarization sub-layer; 1411. Second polarization unit; 1412. Second filling layer; 142. Reflective sub-layer; 15. Electrode layer; 16. Bonding substrate; 17. Bonding adhesive layer. Detailed implementation manners

[0070] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0071] The manufacturing size of LEDs (light-emitting diodes) has a trend of becoming increasingly miniaturized. In recent years, it has become possible to fabricate display substrates with Micro LED (micro light-emitting diode) arrays arranged as pixels. Compared with OLEDs (organic light-emitting diodes), LEDs have absolute advantages in terms of reliability and lifespan. Among them, Micro LED display devices, as the next-generation advanced display technology, have extremely high brightness and small chip sizes that are difficult to replace. Therefore, Micro LED display technology is a new type of display technology that will surpass OLED display technology in the future.

[0072] In related technologies, the bottom of existing Micro LED devices is a flat metal electrode, facing the problem of reduced environmental contrast caused by ambient light reflection. In order to obtain high environmental contrast in small-sized pixel Micro LED display devices, a circular polarizer is generally set on the top of the display device to suppress the reflection of ambient light on the metal at the bottom of the Micro LED device. However, although the setting of the circular polarizer can reduce the ambient light reflectance, it will cause a reduction in the light efficiency and an increase in power consumption of the Micro LED display device, and the process is complex with low integration, requiring multiple alignment and bonding. Moreover, the working bandwidth of the circular polarizer is limited, and RGB patterning cannot be achieved, resulting in a decrease in contrast. Therefore, how to improve the light efficiency of the device while effectively reducing the ambient light reflectance has become an urgent problem in this field.

[0073] In view of this, an embodiment of the present application proposes a light-emitting device. Figure 1 Schematically shows a schematic diagram of the hierarchical structure of a light-emitting device, as Figure 1 shown, the light-emitting device includes: a substrate 11; a light-emitting layer 12, the light-emitting layer 12 is disposed on one side of the substrate 11; a first polarizing layer 13, the first polarizing layer 13 is disposed on the side of the light-emitting layer 12 close to the substrate 11, and the first polarizing layer 13 and the light-emitting layer 12 are respectively disposed on opposite sides of the substrate 11.

[0074] In the embodiment of the present application, the first polarizing layer 13 exhibits an asymmetric optical polarization characteristic, and the optical polarization characteristics of the first polarizing layer 13 for the incident ambient light from the outside and the self-emitted light generated by the light-emitting layer 12 are different. Specifically, the incident ambient light from the outside and the self-emitted light emitted by the light-emitting layer 12 respectively reach opposite sides of the first polarizing layer 13. When the light-emitting device is irradiated with ambient light, the ambient light enters from the side of the first polarizing layer 13 away from the light-emitting layer 12, and the self-emitted light emitted by the light-emitting layer 12 enters from the side of the first polarizing layer 13 close to the light-emitting layer 12. Therefore, in the embodiment of the present application, the optical polarization characteristic of the first polarizing layer 13 on the side close to the light-emitting layer 12 is different from that on the side away from the light-emitting layer 12.

[0075] In the embodiment of the present application, the side of the first polarizing layer 13 close to the light-emitting layer 12 is configured to be able to reflect the second type of polarized light in the light emitted by the light-emitting layer 12 and transmit the first type of polarized light in the light emitted by the light-emitting layer 12. Since the self-emitted light is light rays containing the first type of polarized light and the second type of polarized light, and the first polarizing layer 13 is located on the light-emitting side of the light-emitting device, the light rays emitted by the light-emitting device provided by the embodiment of the present application need to be modulated into the first type of polarized light with a unified polarization form. When the self-emitted light reaches the first polarizing layer 13, it is necessary to first modulate the light rays into the first type of polarized light through the hierarchical structure provided in the light-emitting device in the embodiment of the present application and then emit them, so as to ensure the image quality of the emitted light rays. Therefore, in the embodiment of the present application, by configuring the side of the first polarizing layer 13 close to the light-emitting layer 12 to transmit the first type of polarized light in the light emitted by the light-emitting layer 12 and reflect the second type of polarized light in the light emitted by the light-emitting layer 12 at the same time, when the self-emitted light reaches the first polarizing layer 13, the first type of polarized light in the self-emitted light is emitted from the light-emitting device, and the second type of polarized light in the self-emitted light is reflected back into the interior of the light-emitting device. After the phase of the second type of polarized light is modulated into the first type of polarized light through the internal polarization hierarchical structure, it is then emitted from the first polarizing layer 13, thereby ensuring the unity of the phase of the light rays emitted by the light-emitting device and enhancing the light efficiency of the emitted light rays.

[0076] In the embodiments of the present application, the side of the first polarizing layer 13 away from the light-emitting layer 12 is configured to be able to transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light. The incident ambient light is the same as the self-emitted light, and is also light containing the first type of polarized light and the second type of polarized light. The ambient light is incident from the side of the first polarizing layer 13 away from the light-emitting layer 12, and the ambient light will be reflected by the hierarchical structure on the light-emitting side of the light-emitting device. In the case of a relatively high ambient light reflectivity, the reflected ambient light will be mixed into the first type of polarized light emitted from the first polarizing layer 13, thereby reducing the contrast of the light-emitting device. In the embodiments of the present application, by setting the side of the first polarizing layer 13 away from the light-emitting layer 12 to transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light, when the ambient light reaches the light-emitting side of the first polarizing layer 13, the first type of polarized light in the ambient light enters the interior of the light-emitting device and is emitted from the first polarizing layer 13 through the reflection of the polarization hierarchical structure in the light-emitting device, thereby realizing the improvement of the light efficiency of the emitted light of the light-emitting device by using the first type of polarized light in the ambient light; at the same time, the second type of polarized light in the ambient light is repeatedly oscillated and absorbed by the first polarizing layer 13, reducing the reflection of the second type of polarized light on the first polarizing layer 13, thereby effectively reducing the ambient light reflectivity, ensuring that the second type of polarized light in the ambient light has a smaller proportion in the emitted first type of polarized light, and thus avoiding the display defect caused by the decrease in the contrast of the emitted light.

[0077] In an alternative embodiment, the asymmetric optical polarization characteristic of the first polarizing layer 13 is realized based on the internal structure of the first polarizing layer 13. As Figure 1 shown, the first polarizing layer 13 includes: a first grating, the first grating includes a plurality of first polarization units 131, the plurality of first polarization units 131 are arranged close to the light-emitting layer 12, there is a gap between two adjacent first polarization units 131, and the plurality of first polarization units 131 are periodically arranged at intervals along the first direction to form the first grating. Specifically, Figure 2 shows a partial cross-sectional view of the first polarizing layer in the first grating proposed in an embodiment of the present application on a plane perpendicular to the substrate. As Figure 2As shown, the first polarization unit 131 includes a first part 1311 and a second part 1312. The first part 1311 is disposed on the side away from the light-emitting layer 12 (i.e., on the side close to the ambient light), and the second part 1312 is disposed on the side close to the light-emitting layer 12. The cross-sectional shapes of the first part 1311 and the second part 1312 perpendicular to the plane of the substrate 11 are different. Based on the different-shaped first part 1311 and second part 1312 on both sides of each first polarization unit 131, the light reaching the first part 1311 in the first polarization unit 131 and the light reaching the second part 1312 in the first polarization unit 131 achieve different forms of optical polarization. Specifically, the first part 1311 is configured to be able to transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light; the second part is configured to be able to reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer. For Figure 2 example, the cross-sectional shape of the first part 1311 perpendicular to the plane of the substrate 11 is triangular, and the cross-sectional shape of the second part 1312 perpendicular to the plane of the substrate 11 is rectangular. It should be noted that the cross-sectional shapes of the first part 1311 and the second part 1312 in the above Figure 2 are only an optional way given for better understanding by those skilled in the art. The specific cross-sectional shapes of the first part 1311 and the second part 1312 can be determined according to the actual situation.

[0078] In the embodiment of the present application, the first part 1311 is used to increase the optical path of the second type of polarized light in the ambient light inside the first part 1311, so that the second type of polarized light in the ambient light is absorbed after repeated oscillation inside the first part 1311. Thus, when the ambient light is incident on the first part 1311 of the first polarizing unit 131, the second type of polarized light is absorbed instead of being reflected, thereby reducing the reflectivity of the ambient light and increasing the proportion of the ambient light in the light emitted from the first polarizing layer 13, and improving the display effect. In an alternative embodiment, the first part 1311 includes a first side surface and a plurality of second side surfaces. The first side surface is parallel to and in contact with the side of the second part 1312 away from the light-emitting layer. Two adjacent side surfaces among the plurality of second side surfaces intersect and are oppositely arranged. The orthographic projection of the plurality of second side surfaces on the substrate is a plurality of straight lines. At this time, the cross-sectional shape of the first part 1311 in a plane perpendicular to the substrate 11 is triangular. The second part 1312 includes a fourth side surface, a fifth side surface, a sixth side surface, and a seventh side surface. The fourth side surface and the fifth side surface are parallel to and oppositely arranged. The sixth side surface and the seventh side surface are parallel to and oppositely arranged. The sixth side surface is perpendicular to the fourth side surface. Among them, the fourth side surface or the sixth side surface is parallel to and in contact with the first part. At this time, the cross-sectional shape of the second part 1312 in a plane perpendicular to the substrate 11 is rectangular, and the cross-sectional shape of the first polarizing unit 131 in a plane perpendicular to the substrate 11 is a composite figure of a triangle and a rectangle.

[0079] Exemplarily, Figure 3 shows an example of the orthographic projection of the first grating in the first polarizing layer proposed in an embodiment of the present application on the substrate, Figure 4 shows a schematic diagram of the shapes of the first part and the second part of a first polarizing unit proposed in an embodiment of the present application, as Figure 3 and Figure 4As shown in the figure, the first part 1311 includes a first side face ACDF, a second side face BCEF, and a third side face ABDE that intersect pairwise. The first side face ACDF is parallel to and in contact with the side of the second part 1312 away from the light-emitting layer 13. The second side face BCEF and the third side face ABDE are oppositely arranged, and the orthographic projections of the second side face BCEF and the third side face ABDE on the substrate 11 are three parallel straight lines (i.e., straight line AD, straight line BE, and straight line FC). The second part 1312 includes a fourth side face ACDF, a fifth side face HIJK, a sixth side face AHDG, and a seventh side face CFIK. The fourth side face ACDF and the fifth side face HIJK are parallel to and oppositely arranged. The sixth side face AHDG and the seventh side face CFIK are parallel to and oppositely arranged. The sixth side face AHDG is perpendicular to the fourth side face ACDF. The fourth side face ACDF is parallel to and in contact with the first part 1311.

[0080] In an alternative embodiment, Figure 5 shows a schematic diagram of the shapes of the first part and the second part of another first polarizing unit proposed in an embodiment of the present application. As Figure 5 shown, the first part 1311 includes a first side face and a second arc face. The first side face is parallel to and in contact with the side of the second part 1312 away from the light-emitting layer. The two ends of the second arc face intersect with the opposite ends of the first side face, and the second arc face protrudes in a direction away from the second part 1312. At this time, the cross-sectional shape of the first part 1311 in a plane perpendicular to the substrate 11 is arc-shaped. The second part 1312 includes a fourth side face, a fifth side face, a sixth side face, and a seventh side face. The fourth side face and the fifth side face are parallel to and oppositely arranged. The sixth side face and the seventh side face are parallel to and oppositely arranged. The sixth side face is perpendicular to the fourth side face. Among them, the fourth side face or the sixth side face is parallel to and in contact with the first part. At this time, the cross-sectional shape of the second part 1312 in a plane perpendicular to the substrate 11 is rectangular, and the cross-sectional shape of the first polarizing unit 131 in a plane perpendicular to the substrate 11 is a composite figure of an arc and a rectangle (such as Figure 5 the elliptical composite figure shown).

[0081] In an alternative embodiment, Figure 6d shows a schematic diagram of the cross-section of an irregular composite figure of the first polarizing unit along a plane perpendicular to the substrate plane and grating parameters in an embodiment of the present application. As Figure 6dAs shown, the first part 1311 includes a first side surface and a plurality of second side surfaces. The first side surface is parallel to and in contact with the side of the second part 1312 away from the light-emitting layer. Two adjacent side surfaces among the plurality of second side surfaces intersect and are oppositely arranged. The orthographic projection of the plurality of second side surfaces on the substrate is a plurality of straight lines, and any two straight lines may be parallel or not parallel. At this time, the cross-sectional shape of the first part 1311 in a plane perpendicular to the substrate 11 is an irregular polygonal broken line graph. The second part 1312 includes a fourth side surface, a fifth side surface, a sixth side surface, and a seventh side surface. The fourth side surface and the fifth side surface are parallel to and oppositely arranged. The sixth side surface and the seventh side surface are parallel to and oppositely arranged. The sixth side surface is perpendicular to the fourth side surface. Among them, the fourth side surface or the sixth side surface is parallel to and in contact with the first part. At this time, the cross-sectional shape of the second part 1312 in a plane perpendicular to the substrate 11 is a rectangle, and the cross-sectional shape of the first polarizing unit 131 in a plane perpendicular to the substrate 11 is a composite graph of an irregular polygonal broken line graph and a rectangle.

[0082] It should be noted that in the embodiment of the present application, the cross-sectional shape of the first part 1311 perpendicular to the substrate 11 may be other regular or irregular composite graphs, as long as it is ensured that the shape of the first part 1311 can transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light; the shape of the second part can reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer.

[0083] In an alternative embodiment, the first grating may be any one of a single-layer metal wire grid, a single-layer dielectric wire grid, a double-layer metal wire grid, a double-layer dielectric wire grid, and a hybrid metal / dielectric grating, etc. Among them, the material of the first part 1311 in the first polarizing unit 131 is a metal material, a dielectric material, or a visible light absorbing material; the material of the second part 1312 is a metal material or a dielectric material. Exemplarily, the metal material may be silver, aluminum, gold, etc., and the dielectric material may be silicon nitride, silicon oxide, titanium oxide, gallium nitride, gallium phosphide, etc. In addition, Figure 6e shows a schematic cross-section of an elliptical composite graph perpendicular to the substrate plane and grating parameters when the first part of the first polarizing unit proposed in an embodiment of the present application is a visible light absorbing material, as Figure 6eAs shown, when the first part 1311 is a visible light absorbing material, the absorption of the second type of polarized light in the ambient light by the first part 1311 can be directly achieved through the characteristics of the visible light absorbing material. At this time, the shape of the cross-section of the first part 1311 along the plane perpendicular to the substrate can be the same as that of the first part 1311 of other materials, or can be other conventional shapes (such as Figure 6e the rectangle shown), and this application does not limit this here.

[0084] For a grating, different grating parameters are set to affect the optical polarization characteristics of the grating. The grating parameters include at least one of the following: the number of polarization units, the grating period width of the grating (the width along the arrangement direction of the polarization units of the normal lines of two adjacent polarization units in the grating), the width of each polarization unit along the arrangement direction of the polarization units, and the width of each polarization unit along the direction perpendicular to the arrangement direction of the polarization units. In the embodiments of this application, in order to ensure the asymmetric optical polarization characteristics of the first grating, the grating parameters of the first grating need to be restricted. Specifically, Figure 6a shows a schematic diagram of the cross-section of the second part of the first polarization unit along the plane perpendicular to the substrate and the grating parameters proposed in an embodiment of this application, Figure 6b shows a schematic diagram of the cross-section of the elliptical composite pattern of the first polarization unit along the plane perpendicular to the substrate and the grating parameters proposed in an embodiment of this application, Figure 6c shows a schematic diagram of the cross-section of the triangular composite pattern of the first polarization unit along the plane perpendicular to the substrate and the grating parameters proposed in an embodiment of this application. As Figure 6a-6c shown, the grating period width P of the first grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width a of the first polarization unit 131 along the first direction (i.e., the line width of the first grating) is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the first polarization unit 131 along the direction perpendicular to the first direction (i.e., the height H of each first polarization unit, as Figure 6b and Figure 6c shown, the height H of the first polarization is the height H of the first part 1311 s and the height H of the second part 1312 t sum) is greater than or equal to 0.01 μm and less than or equal to 10 μm. The first grating within the above range-limited grating parameters can cause the second type of polarized light in the incident ambient light to oscillate repeatedly on the side walls of the structure of the first part 1311 and thus be absorbed, achieving the reflection suppression of the ambient light in the first polarization layer. At the same time, higher-order diffraction can be avoided, effectively improving the light efficiency of the light emitted from the first polarization layer 13.

[0085] In the embodiment of the present application, the first polarizing layer 131 further includes a first filling layer 132. The first filling layer 132 is disposed on a side of the first grating away from the light-emitting layer 12, and the first filling layer 132 fills the gaps between the plurality of first polarizing units 131. The first filling layer 132 is used to ensure that the light entering the first polarizing layer 13 has a sufficient transmission distance. Further, the refractive index of the first filling layer is greater than or equal to 1.42 and less than or equal to 1.48. On the other hand, due to the provision of the first filling layer 132, the aspect ratio of the first polarizing unit 131 can be reduced. The first polarizing unit 131 with a smaller aspect ratio can reduce the manufacturing difficulty of the first polarizing unit 131, and at the same time reduce the problems of light scattering and absorption caused by the sidewall roughness of the first polarizing unit 131, effectively improving the light efficiency of the light passing through the first grating. Preferably, the material of the first filling layer 132 can be silicon nitride, silicon oxide, titanium oxide, gallium nitride, gallium phosphide, etc.

[0086] In the embodiment of the present application, in order to make the light entering the light-emitting device exit from the light-emitting side of the first polarizing layer 13 in the form of the first type of polarized light, the phase modulation of the light is realized by providing a second polarizing layer 14 in the light-emitting device. The second polarizing layer 14 is configured to modulate the phase of the light to realize the mutual conversion between the second type of polarized light and the first type of polarized light. That is, when the second type of polarized light reaches the second polarizing layer 14, it will be reflected and converted into the first type of polarized light; when the first type of polarized light reaches the second polarizing layer 14, it will be reflected and converted into the second type of polarized light. Among them, the function of the second polarizing layer 14 to modulate the phase of the light is realized by the polarizing sub-layer 141 and the reflecting sub-layer 142 inside the second polarizing layer 14.

[0087] In an alternative embodiment, as Figure 1 shown, the polarizing sub-layer 141 is disposed on a side of the light-emitting layer 12 away from the substrate 11, and the reflecting sub-layer 142 is disposed on a side of the light-emitting layer 12 away from the substrate 11. Among them, the polarizing sub-layer 141 includes a second grating, the second grating includes a plurality of second polarizing units 1411, the plurality of second polarizing units 1411 are disposed close to the light-emitting layer 12, there are gaps between adjacent two second polarizing units 1411, and the plurality of second polarizing units 1411 are periodically arranged at intervals along the second direction to form the second grating. Figure 11 FIG. shows a schematic diagram of the orientation of a first grating and a second grating proposed in an embodiment of the present application. As Figure 11As shown, the second direction intersects with the first direction in which the first polarizing units 131 in the first grating are arranged, so that the orientations of the first polarizing units 131 and the second polarizing units 1411 are staggered at a certain angle, thereby enabling the light incident on the second grating to achieve a conversion of the polarization state, wherein the angle between the first direction and the second direction is greater than or equal to 30° and less than or equal to 60°, and preferably, the angle between the first direction and the second direction is 45°.

[0088] In addition, the polarizing layer 141 further includes a second filling layer 1412, which is disposed on the side of the second grating away from the light-emitting layer 12, and the second filling layer 1412 fills the gaps between the plurality of second polarizing units 1411. The second filling layer 1412 is used to ensure that the light entering the second polarizing layer 14 has a sufficient transmission distance, that is, the phase difference of the light during the polarization state conversion process in the second polarizing layer 14. On the other hand, due to the provision of the second filling layer 1412, a transparent medium of the second filling layer 1412 exists between the second polarizing unit 1411 and the hierarchical structure away from the second polarizing unit 1411, thereby reducing the aspect ratio of the second polarizing unit 1411. The second polarizing unit 1411 with a smaller aspect ratio can reduce the difficulty of preparing the second polarizing unit 1411, and at the same time reduce the light scattering and absorption problems caused by the roughness of the side wall of the second polarizing unit, and effectively improve the light effect of the light reflected by the second grating. For example, when the second polarizing unit 1411 is prepared by etching, the etching amount of forming the second polarizing unit 1411 can be effectively reduced; when the second polarizing unit 1411 is prepared by filling, the difficulty of filling the second polarizing unit 1411 can be effectively reduced. Further, the refractive index of the second filling layer 1412 is greater than or equal to 1.42 and less than or equal to 1.48. Preferably, the material of the second filling layer 1412 can be silicon nitride, silicon oxide, titanium oxide, gallium nitride, gallium phosphide, etc.

[0089] Further, the second polarizing unit 1411 is configured to reflect the first component of the first type polarized light, the first component of the second type polarized light, and at least one of the first component of the first type polarized light and the first component of the second type polarized light, and transmit the second component of the first type polarized light, the second component of the second type polarized light, and at least one of the second component of the first type polarized light and the second component of the second type polarized light. The reflective sublayer 142 is configured to reflect the first component and the second component of the first type polarized light and / or the second type polarized light. Figure 7a FIG. 1 shows a schematic diagram of a component of an incident light polarization state incident along a right oblique direction proposed in an embodiment of the present application, Figure 7bThe figure shows a schematic diagram of the components of the polarization state of the light reflected by the second polarizing layer according to an embodiment of the present application. As Figure 7a shown, when the first type of polarized light and / or the second type of polarized light enter the second grating as incident light, assuming that the polarization state of the incident light enters obliquely to the right, its first component is the TE mode in the positive x direction, and the second component is the TM mode in the positive y direction. The second polarizing unit 1411 in the second grating reflects the first component in the incident light and transmits the second component to reach the reflective sub-layer 142. The second component reflected by the reflective sub-layer 142 and the first component reflected by the second polarizing unit 1411 have a phase difference of 180°, generating a birefringence effect. At this time, the electric field components become the negative x direction and the positive y direction (as Figure 7b shown), so that the vector sum of the first component and the second component reflected by the second polarizing layer 14 is orthogonal to the original electric field polarization state, realizing the conversion between orthogonal polarization states, which is manifested as the mutual conversion between the first type of polarized light and the second type of polarized light.

[0090] It should be noted that one of the first component and the second component is S-type polarized light and the other is P-type polarized light, that is, the first component is S-type polarized light and the second component is P-type polarized light, or the first component is P-type polarized light and the second component is S-type polarized light. The meanings of P-type polarized light and S-type polarized light are described below. When light penetrates the surface of an optical element (such as a beam splitter) at a non-vertical angle, both the reflection and transmission characteristics depend on the polarization phenomenon. In this case, the coordinate system used is defined by the plane containing the input and reflected light beams. If the polarization vector of the light is in this plane, it is called P-type polarized light; if the polarization vector is perpendicular to this plane, it is called S-type polarized light.

[0091] In an alternative embodiment, Figure 10 The figure shows a schematic diagram of the hierarchical structure in which the first polarizing layer and the second polarizing layer are arranged on the same side of the substrate in a light-emitting device according to an embodiment of the present application. As Figure 10 shown, the polarizing sub-layer 141 is disposed on the side of the light-emitting layer 12 close to the substrate 11, the polarizing sub-layer 141 is disposed between the first polarizing layer 13 and the substrate 11, the second grating in the polarizing sub-layer 141 is disposed close to the light-emitting layer 12, and the second filling layer 1412 in the polarizing sub-layer 141 is disposed away from the light-emitting layer 12. At this time, the first polarizing layer 13 and the polarizing sub-layer 141 can be prepared by a single-sided process without changing the polarization performance of the light-emitting device, thereby simplifying the preparation process.

[0092] Figure 8 The figure shows a schematic diagram of the optical path transmission of a light-emitting device based on the first polarizing layer and the second polarizing layer. As Figure 8As shown, the horizontal double arrows represent the first type of polarized light, and the vertical double arrows represent the second type of polarized light. The first layer of nanowire grating is the first polarizing layer 13 in the embodiment of the present application, and the second layer of nanowire grating is the second polarizing layer 14 described in the embodiment of the present application. The light-emitting layer 12 generates self-luminous light including the first type of polarized light and the second type of polarized light. The self-luminous light reaches the side of the first polarizing unit 131 in the first polarizing layer 14 close to the light-emitting layer 12. The second part 1312 of the first polarizing unit 131 close to the light-emitting layer 12 is configured to transmit the first type of polarized light and reflect the second type of polarized light. Therefore, the first type of polarized light in the self-luminous light passes through the first polarizing layer 13 and exits, and the second type of polarized light is reflected by the second part 1312 in the first polarizing unit 131 and reaches the second polarizing layer 14. The second polarizing unit 1411 in the second polarizing layer 14 reflects the first component in the second type of polarized light and transmits the second component in the second type of polarized light to the reflection sub-layer 142. The reflection sub-layer 142 reflects the second component in the second type of polarized light, and the two form a phase difference and are combined into the first type of polarized light, that is, the second type of polarized light is phase-converted by the second polarizing layer 14 and reflected as the first type of polarized light and exits from the first polarizing layer 13.

[0093] The self-luminous light generated by the light-emitting layer 12 propagates towards the second polarizing layer 14, and the first type of polarized light and the second type of polarized light therein respectively undergo phase conversion, and the reflection is still the first type of polarized light and the second type of polarized light (that is, the self-luminous light still including the first type of polarized light and the second type of polarized light). The self-luminous light reflected by the second polarizing layer 14 reaches the side of the first polarizing unit 131 in the first polarizing layer 14 close to the light-emitting layer 12. The second part 1312 of the first polarizing unit 131 close to the light-emitting layer 12 is configured to transmit the first type of polarized light and reflect the second type of polarized light. Therefore, the first type of polarized light in the self-luminous light passes through the first polarizing layer 13 and exits, and the second type of polarized light is reflected by the second part 1312 in the first polarizing unit 131 and reaches the second polarizing layer 14, and is phase-converted by the second polarizing layer 14 and reflected as the first type of polarized light and exits from the first polarizing layer 13.

[0094] Ambient light enters from the outside of the light-emitting device into the side of the first polarizing layer 13 away from the light-emitting layer 12. The ambient light includes a first type of polarized light and a second type of polarized light. The first part 1311 of the first polarizing unit 131 away from the light-emitting layer 12 is configured to transmit the first type of polarized light and absorb the second type of polarized light. Therefore, when the second type of polarized light in the ambient light enters the first part 1311 of the first polarizing unit 131, it is absorbed by the first part 1311 through repeated oscillations. The first type of polarized light in the ambient light passes through the first polarizing layer 13 and enters the light-emitting device to reach the second polarizing layer 14. The first type of polarized light is phase-converted by the second polarizing layer 14 and reflected as the second type of polarized light to reach the second part 1312 of the first polarizing unit 131, then reflected by the second part 1312 and returns to the second polarizing layer 14, and is phase-converted by the second polarizing layer 14 and reflected as the first type of polarized light to exit from the first polarizing layer 13.

[0095] In an alternative embodiment, the second grating can be any one of a single-layer metal wire grid, a single-layer dielectric wire grid, a double-layer metal wire grid, a double-layer dielectric wire grid, and a hybrid metal / dielectric grating, etc. Among them, the material in the second polarizing unit 1411 is a metal material, a dielectric material, or a visible light absorbing material. Exemplarily, the metal material can be silver, aluminum, gold, etc., and the dielectric material can be silicon nitride, silicon oxide, titanium oxide, gallium nitride, gallium phosphide, etc. In addition, the cross-sectional shape of the second polarizing unit 1411 along the plane perpendicular to the substrate 11 is rectangular.

[0096] In an alternative embodiment, in order to ensure the optical polarization characteristics of the second grating, it is necessary to limit the grating parameters of the second grating. Specifically, the grating period width P of the second grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width of the second polarizing unit 1411 along the second direction (i.e., the line width of the first grating) a is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the second polarizing unit 1411 along the direction perpendicular to the second direction (i.e., the height of each second polarizing unit) is greater than or equal to 0.01 μm and less than or equal to 10 μm. The second grating within the grating parameter range limited above can reflect at least one of the first component of the first type of polarized light, the first component of the second type of polarized light, and the first component of the first type of polarized light and the first component of the second type of polarized light, and transmit at least one of the second component of the first type of polarized light, the second component of the second type of polarized light, and the second component of the first type of polarized light and the second component of the second type of polarized light.

[0097] In an alternative embodiment, in order to further suppress the reflection of ambient light, the light-emitting device further includes a filter layer for reducing two-thirds of the ambient light, thereby further reducing the ambient light reflectance. Specifically, the filter layer is disposed between the first polarizing layer 13 and the light-emitting layer 12. The filter layer may be a first filter layer or a second filter layer. The first filter layer is a single-layer color film filter or a plasmon resonance filter; the second filter layer includes two stacked reflection structures and a patterned layer disposed between the two reflection structures. Figure 9 FIG. Figure 9 shows a red light efficiency curve of a light-emitting device provided with a filter layer according to an embodiment of the present application. As Figure 9 shown, for the light-emitting device provided with the filter layer, the self-luminous transmittance near the red light of 610 nm is 68%, which is about 62% higher than the self-luminous transmittance of the existing light-emitting device (generally 42%), and the ambient light reflectance is 7%. Therefore, the light-emitting device provided by the embodiment of the present application can effectively improve the light efficiency of the display panel while ensuring a low ambient light reflectance.

[0098] In an alternative embodiment, in order to further improve the optical polarization effect of the first grating and / or the second grating, the first polarizing unit and / or the second polarizing unit in the embodiment of the present application may be replaced with a two-dimensional grating structure from a one-dimensional wire grid structure. Specifically, taking the first polarizing unit as an example, Figure 19 FIG. Figure 19 shows a schematic structural diagram of a first polarizing sub-unit according to an embodiment of the present application. As Figure 19 shown, each of the first polarizing units 131 includes a plurality of first polarizing sub-units 131-1 spaced along the length direction of the first polarizing unit 131. That is, in the first grating, the first polarizing sub-units 131-1 are arranged in an array to form a two-dimensional grating structure. Optionally, the first polarizing sub-unit 131-1 is a columnar structure, and the orthographic projection of the first polarizing sub-unit on the substrate 11 is a polygon or an arc. Exemplarily, the first polarizing sub-unit 131-1 may be a straight column (such as a quadrangular prism), a cylinder, an elliptical cylinder, etc.

[0099] In an alternative embodiment, the light-emitting layer 12 includes: a buffer layer 121 disposed on a side close to the substrate 11; a first semiconductor layer 122 disposed on a side of the buffer layer 121 facing away from the substrate 11; an active layer 123 disposed on a side of the first semiconductor layer 122 facing away from the substrate 11; and a second semiconductor layer 124 disposed on a side of the active layer 123 facing away from the substrate 11, wherein one of the first semiconductor layer 122 and the second semiconductor layer 124 is an N-type semiconductor and the other is a P-type semiconductor. Preferably, the buffer layer 121 is a gallium nitride layer, the active layer 123 is an indium gallium nitride / gallium nitride quantum well layer, and one of the first semiconductor layer 121 and the second semiconductor layer 124 is an N-type gallium nitride layer and the other is a P-type gallium nitride layer.

[0100] In an alternative embodiment, the light-emitting device further includes: an electrode layer 15 disposed between the second polarizing layer 14 and the light-emitting layer 12; a bonding substrate 16 disposed between the first polarizing layer 13 and the substrate 11; and a bonding adhesive layer 17 disposed between the bonding substrate 16 and the substrate 11.

[0101] To enable those skilled in the art to more clearly understand the present application, the light-emitting device described in the present application will now be described in detail through the following embodiments.

[0102] The embodiment of the present application provides a red light-emitting device, which has the same structure as the light-emitting device described above in the embodiment of the present application. Among them, the cross-sectional shape of the first polarizing unit 131 of the red light-emitting device in a plane perpendicular to the substrate 11 is a composite figure of a triangle and a rectangle. Specifically, the first part 1311 of the first polarizing unit 131 includes a first side surface and a plurality of second side surfaces, the first side surface is parallel and in contact with a side of the second part 1312 away from the light-emitting layer; two adjacent side surfaces among the plurality of second side surfaces intersect and are oppositely arranged, and the positive projection of the plurality of second side surfaces on the substrate is a plurality of straight lines. At this time, the cross-sectional shape of the first part 1311 in a plane perpendicular to the substrate 11 is a triangle. The second part 1312 of the first polarizing unit 131 includes a fourth side surface, a fifth side surface, a sixth side surface, and a seventh side surface. The fourth side surface and the fifth side surface are parallel and oppositely arranged, the sixth side surface and the seventh side surface are parallel and oppositely arranged, and the sixth side surface is perpendicular to the fourth side surface; wherein, the fourth side surface or the sixth side surface is parallel and in contact with the first part. At this time, the cross-sectional shape of the second part 1312 in a plane perpendicular to the substrate 11 is a rectangle.

[0103] Among them, the first grating of the red light-emitting device is a single-layer metal grating. The materials of the first part 1311 and the second part 1312 in the first polarization unit 131 are silver, and the refractive index of the first filling layer 132 is 1.46. The grating period width P of the first grating is 0.4 μm; the width of the first polarization unit 131 along the first direction (i.e., the line width of the first grating) a is 0.2 μm; the height H of the first part 1311 s is 0.24 μm, and the height H of the second part 1312 t is 0.05 μm. Figure 12a shows the curves of the reflectivity and transmittance of different polarized lights of the second part of the first polarization unit in a red light-emitting device proposed in an embodiment of the present application, Figure 12b shows the curves of the reflectivity and transmittance of different polarized lights of the first part of the first polarization unit in a red light-emitting device proposed in an embodiment of the present application. As Figure 12a-12b shown, the first part 1311 is close to the ambient light side (the side away from the light-emitting layer), which is the low-reflection side, corresponding to Figure 12b the curves of the reflectivity and transmittance of different polarized lights incident on the low-reflection side shown; the second part 1312 is close to the light-emitting layer side, which is the high-reflection side, corresponding to Figure 12a the curves of the reflectivity and transmittance of different polarized lights incident on the high-reflection side shown. Among them, Ts_N is the transmittance of the first type of polarized light in self-emission, Rs_N is the reflectivity of the first type of polarized light in self-emission, Tp_N is the transmittance of the second type of polarized light in self-emission, Rp_N is the reflectivity of the second type of polarized light in self-emission. For low-reflection side incidence, Ts_B is the transmittance of the first type of polarized light in ambient light, Rs_B is the reflectivity of the first type of polarized light in ambient light, Tp_B is the transmittance of the second type of polarized light in ambient light, and Rp_B is the reflectivity of the second type of polarized light in ambient light. From Figure 12a and Figure 12b it can be seen that for the first polarization unit 131 of the red light-emitting device set according to the above-mentioned content, in the first part 1311, near 610 nm in the red light wavelength range, the reflectivity of the second type of polarized light in ambient light significantly decreases. Therefore, the first polarization layer 13 of the red light-emitting device provided by the embodiment of the present application exhibits the asymmetric optical polarization characteristic that the side away from the light-emitting layer can transmit the first type of polarized light in ambient light and absorb the second type of polarized light in the ambient light; the side of the first polarization layer close to the light-emitting layer can reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer.

[0104] In the red light-emitting device provided by the embodiment of the present application, the second grating is a single-layer metal grating, the material of the second polarization unit 1411 is silver, the refractive index of the second filling layer 1412 is 1.46, the material of the second filling layer 1412 is BCB glue, the thickness of the second filling layer 1412 is 0.115 nm, and the material of the reflection sub-layer 142 is silver. The grating period width P of the second grating is 0.3 μm; the width of the second polarization unit 1411 along the second direction (i.e., the line width of the second grating) a is 0.095 μm; the width of the second polarization unit 1411 along the direction perpendicular to the second direction is 0.115 μm. Figure 13 shows the polarization conversion efficiency curve of the second polarization layer in a red light-emitting device proposed in an embodiment of the present application, as Figure 13 shown. For the second polarization layer 14 of the red light-emitting device set according to the above description, near 610 nm in the red light wavelength range, the polarization conversion efficiency between the first type of polarized light and the second type of polarized light is higher than 0.8. Therefore, the second polarization layer 14 of the red light-emitting device provided by the embodiment of the present application exhibits the optical polarization characteristic of being able to modulate the phase of light and realize the mutual conversion between the second type of polarized light and the first type of polarized light.

[0105] The embodiment of the present application provides a blue light-emitting device, which has the same structure as the above-mentioned light-emitting device in the embodiment of the present application. Among them, the cross-sectional shape of the first polarization unit 131 of the blue light-emitting device along the plane perpendicular to the substrate 11 is a composite figure of a triangle and a rectangle. Specifically, the first part 1311 of the first polarization unit 131 includes a first side surface and a plurality of second side surfaces, the first side surface is parallel and in contact with the side of the second part 1312 away from the light-emitting layer; two adjacent side surfaces among the plurality of second side surfaces intersect and are opposite to each other, and the positive projection of the plurality of second side surfaces on the substrate is a plurality of straight lines. At this time, the cross-sectional shape of the first part 1311 along the plane perpendicular to the substrate 11 is a triangle. The second part 1312 of the first polarization unit 131 includes a fourth side surface, a fifth side surface, a sixth side surface, and a seventh side surface. The fourth side surface and the fifth side surface are parallel and opposite to each other, the sixth side surface and the seventh side surface are parallel and opposite to each other, and the sixth side surface is perpendicular to the fourth side surface; among them, the fourth side surface or the sixth side surface is parallel and in contact with the first part. At this time, the cross-sectional shape of the second part 1312 along the plane perpendicular to the substrate 11 is a rectangle.

[0106] Among them, the first grating of the blue light-emitting device is a single-layer metal grating. The materials of the first part 1311 and the second part 1312 in the first polarization unit 131 are silver, and the refractive index of the first filling layer 132 is 1.46. The grating period width P of the first grating is 0.265 μm; the width of the first polarization unit 131 along the first direction (i.e., the line width of the first grating) a is 0.095 μm; the height H of the first part 1311 s is 0.180 μm, and the height H of the second part 1312 t is 0.1 μm. The first polarization unit 131 of the blue light-emitting device set according to the above content, in the first part 1311, in the blue light wavelength range, the reflectivity of the second type of polarized light in the ambient light significantly decreases. Therefore, the first polarization layer 13 of the blue light-emitting device provided by the embodiment of the present application exhibits the asymmetric optical polarization characteristic that the first type of polarized light in the ambient light can be transmitted on the side away from the light-emitting layer and the second type of polarized light in the ambient light can be absorbed; on the side of the first polarization layer close to the light-emitting layer, the second type of polarized light in the light emitted by the light-emitting layer can be reflected and the first type of polarized light in the light emitted by the light-emitting layer can be transmitted.

[0107] In the blue light-emitting device provided by the embodiment of the present application, the second grating is a single-layer metal grating. The material of the second polarization unit 1411 is silver, the refractive index of the second filling layer 1412 is 1.46, the material of the second filling layer 1412 is BCB glue, and the thickness of the second filling layer 1412 is 0.21 nm. The material of the reflection sub-layer 142 is silver. The grating period width P of the second grating is 0.14 μm; the width of the second polarization unit 1411 along the second direction (i.e., the line width of the second grating) a is 0.04 μm; the width of the second polarization unit 1411 perpendicular to the second direction is 0.035 μm. The polarization conversion efficiency between the first type of polarized light and the second type of polarized light of the second polarization layer 14 of the blue light-emitting device set according to the above content is 0.77 in the blue light wavelength range. Therefore, the second polarization layer 14 of the blue light-emitting device provided by the embodiment of the present application exhibits the optical polarization characteristic of being able to modulate the phase of light and realizing the mutual conversion between the second type of polarized light and the first type of polarized light.

[0108] An embodiment of the present application provides a light-emitting device, which includes: a substrate, and a light-emitting layer disposed on one side of the substrate; a first polarizing layer, the first polarizing layer is disposed on the side of the light-emitting layer close to the substrate, and a first polarizing layer is formed on the side of the light-emitting layer close to the substrate. Wherein, the first polarizing layer includes a plurality of first polarizing units, and each first polarizing unit includes a first part on the side away from the light-emitting layer and a second part on the side close to the light-emitting layer, and the cross-sectional shapes of the first part and the second part in a plane perpendicular to the substrate are different; a second polarizing layer is formed, the second polarizing layer includes a photon polarizing layer, the photon polarizing layer is disposed on the side of the light-emitting layer facing away from the substrate, or the photon polarizing layer is disposed on the side of the light-emitting layer close to the substrate, the photon polarizing layer includes a plurality of second polarizing units, and the arrangement directions of the plurality of second polarizing units are different from those of the plurality of first polarizing units. By providing the first polarizing layer with asymmetric optical polarization characteristics, the present application polarizes the ambient light incident from the side of the ambient light and the self-emitted light emitted by the light-emitting layer in different forms, so that the second type of polarized light in the ambient light is absorbed, while the first type of polarized light in the ambient light and the self-emitted light enter the inside of the light-emitting device, thereby reducing the reflectivity of the ambient light and reducing the proportion of the ambient light in the emitted light of the light-emitting device; at the same time, the light entering the inside of the light-emitting device is modulated by the second polarizing layer and the first polarizing layer and then all exits from the light-emitting side, effectively enhancing the light efficiency of the light-emitting device.

[0109] Based on the same inventive concept, an embodiment of the present application discloses a display panel, which includes: a substrate 1; and a plurality of the light-emitting devices in the embodiments of the present application, the plurality of light-emitting devices are disposed on one side of the substrate 1; wherein, the plurality of light-emitting devices include light-emitting devices that emit different color lights. Specifically, the plurality of light-emitting devices include any one or more of a red light-emitting device, a blue light-emitting device, a green light-emitting device, and a white light-emitting device. The red light-emitting device emits red light, the blue light-emitting device emits blue light, the green light-emitting device emits green light, and the white light-emitting device emits white light. Exemplarily, the display panel may include a red light-emitting device, a blue light-emitting device, and a green light-emitting device, and the display panel may further include a red light-emitting device, a blue light-emitting device, a green light-emitting device, and a white light-emitting device.

[0110] In an alternative embodiment, the grating parameters of the first polarizing layer and / or the second polarizing layer in the plurality of light-emitting devices emitting light of different colors are different, where the grating parameters at least include one of the following: the number of polarization units, the grating period width of the grating, the width of each polarization unit along the arrangement direction of the polarization units, and the width of each polarization unit along the direction perpendicular to the arrangement direction of the polarization units. The existing solutions for reducing the ambient light reflectivity using circular polarizers are generally narrowband polarizers designed for a single wavelength, which results in low broadband working efficiency. In the embodiments of the present application, based on semiconductor processing, patterning of corresponding different polarizing layers for a plurality of color light-emitting devices can be achieved, so that different color light-emitting devices have adaptable grating parameters, ensuring that each different color light-emitting device has the lowest ambient light reflectivity and the maximum light efficiency for each different color light. Figure 14 FIG. shows a grating example diagram of different color light-emitting chips in an RGB display panel proposed in an embodiment of the present application. As Figure 14 shown, the number of first polarization units of the R-type first grating of the red light-emitting device, the G-type first grating of the green light-emitting device, and the B-type first grating of the blue light-emitting device decreases in sequence, and the grating period width of the first grating increases in sequence; the number of second polarization units of the R-type second grating of the red light-emitting device, the G-type second grating of the green light-emitting device, and the B-type second grating of the blue light-emitting device decreases in sequence, and the grating period width of the second grating increases in sequence. By setting different grating parameters for the first grating and the second grating of the red light-emitting device, the green light-emitting device, and the blue light-emitting device, it is ensured that the red light-emitting device, the green light-emitting device, and the blue light-emitting device in the display panel are all at the lowest ambient light reflectivity and the maximum light efficiency.

[0111] Figure 15 FIG. shows a flowchart of optimizing the design of grating parameters of different color light-emitting chips in an RGB display panel proposed in an embodiment of the present application. As Figure 15 shown, first, the central working wavelength of each color light is extracted based on the LED emission spectrum. Taking the RGB three-color light-emitting device as an example, the central working wavelength of red light, the central working wavelength of green light, and the central working wavelength of blue light are determined respectively; subsequently, based on the central working wavelength of red light, the central working wavelength of green light, and the central working wavelength of blue light, the grating parameters of the first grating and the second grating of the red light-emitting device, the green light-emitting device, and the blue light-emitting device are optimized respectively. Among them, the order of optimizing the grating parameters of the first grating and the second grating of the red light-emitting device, the green light-emitting device, and the blue light-emitting device can be adjusted according to the actual situation. Figure 15is only an optional example; then, the RGB three-color light-emitting devices obtained through the optimized design are tested to check whether the environmental reflectivity and luminous efficacy of the light-emitting devices of each color meet the preset application indicators. When the application indicators are met, the RGB pixelated grating layout is carried out.

[0112] In an optional implementation manner, in order to further reduce the environmental reflectivity of the light-emitting devices of each color, in the display panel provided by the embodiments of the present application, different second filter layers are provided in each light-emitting device of different colors. Figure 16 shows a schematic diagram of the second filter layer corresponding to the RGB light-emitting devices of a display panel provided by an embodiment of the present application, as Figure 16 shown, a red second filter layer (RCF) is provided in the red light-emitting device, a green second filter layer (GCF) is provided in the green light-emitting device, and a blue second filter layer (BCF) is provided in the blue light-emitting device. By providing different second filter layers for the light-emitting devices of different colors, the monochromatic transmittance is improved, and since the second filter layer can use semiconductor manufacturing processes, the size and thickness of the second filter layer can be further reduced.

[0113] In an optional implementation manner, the second filter layer is a dielectric color film filter, and the dielectric color film filter is an inorganic dielectric filter, including two stacked reflection structures and a patterned layer provided between the two reflection structures. Taking the display panel of the RGB light-emitting devices as an example, in the RGB light-emitting devices, the materials of the reflection structures corresponding to the red light-emitting device, the green light-emitting device, and the blue light-emitting device are the same; the materials of the patterned layers corresponding to the red light-emitting device, the green light-emitting device, and the blue light-emitting device are not completely the same.

[0114] Further, Figure 17 shows a schematic diagram of the second filter layer structures corresponding to the RGB light-emitting devices of a display panel provided by an embodiment of the present application, as Figure 17 shown, the first reflection structure in the second filter layer is located above each pixel region, the second reflection structure in the second filter layer is located below each pixel region, and the patterned layer in the second filter layer is located in the middle of each pixel region. Figure 17It can be known that the materials of the first reflective structure and the second reflective structure corresponding to the red light-emitting device, the green light-emitting device, and the blue light-emitting device are the same. The materials of the patterned layers corresponding to the red light-emitting device, the green light-emitting device, and the blue light-emitting device are different from each other. Preferably, the material of the patterned layer corresponding to the red light-emitting device is MgF2; the material of the patterned layer corresponding to the green light-emitting device is MgF2 and NbO2; the material of the patterned layer corresponding to the blue light-emitting device is NbO2.

[0115] Based on the same inventive concept, an embodiment of the present application provides a method for manufacturing a light-emitting device for manufacturing the light-emitting device described in the embodiment of the present application. The manufacturing method includes: providing a substrate; forming a light-emitting layer on one side of the substrate; forming a first polarizing layer on the side of the light-emitting layer close to the substrate, where the first polarizing layer includes a plurality of first polarizing units, and each of the first polarizing units includes a first part on the side away from the light-emitting layer and a second part on the side close to the light-emitting layer, and the cross-sectional shapes of the first part and the second part in a plane perpendicular to the substrate are different; forming a second polarizing layer, the second polarizing layer includes a photon polarization layer, the photon polarization layer is disposed on the side of the light-emitting layer away from the substrate, or the photon polarization layer is disposed on the side of the light-emitting layer close to the substrate, the photon polarization layer includes a plurality of second polarizing units, and the arrangement directions of the plurality of second polarizing units are different from those of the plurality of first polarizing units.

[0116] In an alternative embodiment, the photon polarization layer 141 in the light-emitting device is disposed on the side of the light-emitting layer 12 away from the substrate 11. Specifically, the manufacturing method includes the following steps:

[0117] S11. Anneal the electrode layer. Figure 18a FIG. shows a hierarchical structure diagram of annealing the electrode layer in a method for manufacturing a light-emitting device proposed in an embodiment of the present application. As Figure 18a shown, when specifically implementing step S11, first provide a substrate 11; form a light-emitting layer 12 on one side of the substrate 11, the light-emitting layer 12 includes a buffer layer 121, a first semiconductor layer 122, an active layer 123, and a second semiconductor layer 124 stacked on one side of the substrate; form an electrode layer 15 on the side of the light-emitting layer 12 away from the substrate, and the material of the electrode layer 15 is ITO. After forming the electrode layer 15, anneal the electrode layer 15 to reduce the roughness of the surface of the electrode layer 15 on the side away from the substrate.

[0118] S12. Form a second grating. Figure 18bThe schematic diagram of the hierarchical structure of forming a second grating in a method for manufacturing a light-emitting device according to an embodiment of the present application is shown. As Figure 18b shown, in the specific implementation step S12, a second grating material layer is formed on the side of the electrode layer 15 facing away from the light-emitting layer 12. The second grating is formed on the first grating material layer by etching or filling. The second grating includes a plurality of second polarization units 1411 arranged at intervals along a second direction. The plurality of second polarization units 1411 are disposed close to the light-emitting layer 12, and there is a gap between two adjacent second polarization units 1411. Exemplarily, a silver metal layer is deposited on the side of the electrode layer 15 facing away from the light-emitting layer 12, and the pattern of the second grating is nanoimprinted and a plurality of second grating units 1411 of the second grating are etched.

[0119] S13. Form a second filling layer. Figure 18c The schematic diagram of the hierarchical structure of forming a second filling layer in a method for manufacturing a light-emitting device according to an embodiment of the present application is shown. As Figure 18c shown, in the specific implementation step S13, a material for the second filling layer is formed on the side of the second grating facing away from the light-emitting layer 12 to form a second filling layer 1412. Wherein, the material of the second filling layer fills the gap between the second polarization units 1411. Exemplarily, a BCB photoresist is spin-coated on the side of the obtained second grating facing away from the light-emitting layer 12 to form the second filling layer 1412.

[0120] S14. Form a reflective sublayer. Figure 18d The schematic diagram of the hierarchical structure of forming a reflective sublayer in a method for manufacturing a light-emitting device according to an embodiment of the present application is shown. As Figure 18d shown, in the specific implementation step S14, a reflective sublayer 142 is formed on the side of the second filling layer 1412 facing away from the light-emitting layer 12. Exemplarily, a silver metal material layer is deposited on the side of the second filling layer 1412 facing away from the light-emitting layer 12 to obtain the second filling layer 1412.

[0121] S15. Form a first polarization layer on the bonding substrate. Figure 18e The schematic diagram of the hierarchical structure of forming a first polarization layer on the bonding substrate in a method for manufacturing a light-emitting device according to an embodiment of the present application is shown. As Figure 18eAs shown, during the specific implementation step S15, first, a bonding substrate 16 is provided; a first grating material layer is formed on one side of the bonding substrate 16, and the first grating is formed on the first grating material layer by etching or filling. The first grating includes a plurality of first polarization units 131 arranged at intervals in a first direction. The plurality of first polarization units 131 are disposed close to the bonding substrate 16, and there is a gap between two adjacent first polarization units 131. Subsequently, a material for the first filling layer is formed on the side of the first grating facing away from the bonding substrate 16 to form a first filling layer 132. Among them, the material of the first filling layer fills the gaps between the first polarization units 131. Exemplarily, a silver metal layer is deposited on one side of the bonding substrate 16, the pattern of the first grating is nanoimprinted and a plurality of first grating units 131 of the first grating are etched; a material for the first filling layer is spin-coated on the side of the obtained second grating facing away from the bonding substrate 16 to form the first filling layer 132.

[0122] S16. Bond the bonding substrate to the light-emitting layer. Figure 18f The figure shows a schematic hierarchical structure diagram of bonding between a bonding substrate and a light-emitting layer in a method for manufacturing a light-emitting device according to an embodiment of the present application. As Figure 18f shown, during the specific implementation step S16, a bonding adhesive is spin-coated on the side of the light-emitting layer 12 facing away from the second polarization layer 14 to form a bonding adhesive layer 17; the bonding substrate 16 formed with the first polarization layer 13 and the light-emitting device formed with the second polarization layer 14 are bonded through the bonding adhesive layer 17 to obtain the light-emitting device described in the embodiment of the present application.

[0123] Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0124] As used herein, "one embodiment", "an embodiment" or "one or more embodiments" means that the specific features, structures or characteristics described in connection with the embodiment are included in at least one embodiment of the present disclosure. In addition, please note that the examples of the phrase "in one embodiment" herein do not necessarily all refer to the same embodiment.

[0125] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present disclosure can be practiced without these specific details. In some instances, well-known methods, structures and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0126] In a claim, any reference sign in parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not recited in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In a unit claim listing several devices, several of these devices may be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words may be interpreted as names.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A light-emitting device, characterized in that, The light-emitting device includes: a substrate, and a light-emitting layer disposed on one side of the substrate; a first polarizing layer, the first polarizing layer being disposed on the side of the light-emitting layer close to the substrate, wherein the first polarizing layer includes a plurality of first polarizing units, and each first polarizing unit includes a first portion on the side away from the light-emitting layer and a second portion on the side close to the light-emitting layer, and the cross-sectional shapes of the first portion and the second portion in a plane perpendicular to the substrate are different; a second polarizing layer, the second polarizing layer including a photon-polarizing sub-layer, the photon-polarizing sub-layer being disposed on the side of the light-emitting layer facing away from the substrate, or the photon-polarizing sub-layer being disposed on the side of the light-emitting layer close to the substrate, the photon-polarizing sub-layer including a plurality of second polarizing units, and the arrangement directions of the plurality of second polarizing units are different from those of the plurality of first polarizing units.

2. The light-emitting device according to claim 1, characterized in that, The first polarizing layer includes: a first grating, the first grating including the plurality of first polarizing units arranged at intervals in a first direction, the plurality of first polarizing units being disposed close to the light-emitting layer, and there being a gap between two adjacent first polarizing units; a first filling layer, the first filling layer being disposed on the side of the first grating facing away from the light-emitting layer, and the first filling layer filling the gaps between the plurality of first polarizing units.

3. The light-emitting device according to claim 1, wherein, The first portion is configured to be able to transmit the first type of polarized light in the ambient light and absorb the second type of polarized light in the ambient light; the second portion is configured to be able to reflect the second type of polarized light in the light emitted by the light-emitting layer and transmit the first type of polarized light in the light emitted by the light-emitting layer.

4. The light-emitting device according to claim 1, wherein The first portion includes a first side surface, a second side surface, and a third side surface that intersect pairwise, and the first side surface is parallel to and in contact with the side of the second portion away from the light-emitting layer; the second side surface and the third side surface are oppositely disposed, and the orthographic projections of the second side surface and the third side surface on the substrate are three mutually parallel straight lines.

5. The light-emitting device according to claim 1, wherein The first portion includes a first side surface and a second arc surface, the first side surface is parallel to and in contact with the side of the second portion away from the light-emitting layer; the second arc surface intersects the two opposite ends of the first side surface, and the second arc surface protrudes in a direction away from the second portion.

6. The light-emitting device according to claim 1, wherein The first portion includes a first side surface and a plurality of second side surfaces, the first side surface is parallel to and in contact with the side of the second portion away from the light-emitting layer; two adjacent side surfaces among the plurality of second side surfaces intersect and are oppositely disposed, and the orthographic projections of the plurality of second side surfaces on the substrate are a plurality of straight lines.

7. The light-emitting device according to claim 1, wherein The second portion includes a fourth side surface, a fifth side surface, a sixth side surface, and a seventh side surface, the fourth side surface and the fifth side surface are parallel to and oppositely disposed, the sixth side surface and the seventh side surface are parallel to and oppositely disposed, and the sixth side surface is perpendicular to the fourth side surface; wherein, the fourth side surface or the sixth side surface is parallel to and in contact with the first portion.

8. The light-emitting device according to claim 2, characterized in that, The grating period width of the first grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width of the first polarization unit along the first direction is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the first polarization unit along the direction perpendicular to the first direction is greater than or equal to 0.01 μm and less than or equal to 10 μm.

9. The light-emitting device according to claim 1, wherein, The material of the first part is a metal material, a dielectric material or a visible light absorbing material; the material of the second part is a metal material or a dielectric material.

10. The light-emitting device according to claim 1, wherein The second polarization layer further includes a reflective sub-layer, and the reflective sub-layer is disposed on a side of the light-emitting layer away from the substrate; the second polarization layer is configured to modulate the phase of light to achieve mutual conversion between the second type of polarized light and the first type of polarized light.

11. The light-emitting device according to claim 10, characterized in that, The polarization sub-layer includes: A second grating, the second grating includes a plurality of the second polarization units arranged at intervals along a second direction, the plurality of second polarization units are disposed close to the light-emitting layer, and there is a gap between two adjacent second polarization units, the second direction intersects with the first direction, and the first direction is the direction in which the plurality of first polarization units are arranged; A second filling layer, the second filling layer is disposed on a side of the second grating away from the light-emitting layer, and the second filling layer fills the gaps between the plurality of second polarization units.

12. The light-emitting device according to claim 11, wherein, The second polarization unit is configured to reflect at least one of a first component of the first type of polarized light, a first component of the second type of polarized light, and a first component of the first type of polarized light and a first component of the second type of polarized light, and transmit at least one of a second component of the first type of polarized light, a second component of the second type of polarized light, and a second component of the first type of polarized light and a second component of the second type of polarized light; The reflective sub-layer is configured to reflect the first component and the second component of the first type of polarized light and / or the second type of polarized light.

13. The light-emitting device according to claim 11, characterized in that, The grating period width of the second grating is greater than or equal to 0.1 μm and less than or equal to 2 μm; the width of the second polarization unit along the second direction is greater than or equal to 0.01 μm and less than or equal to 1.8 μm; the width of the second polarization unit along the direction perpendicular to the second direction is greater than or equal to 0.01 μm and less than or equal to 10 μm.

14. The light-emitting device according to claim 1, characterized in that, The light-emitting device further includes a filter layer, and the filter layer is disposed between the first polarization layer and the light-emitting layer, wherein the filter layer is a first filter layer or a second filter layer, the first filter layer is a single-layer color film filter or a plasma resonance filter; the second filter layer includes two stacked reflective structures and a patterned layer disposed between the two reflective structures.

15. The light-emitting device according to claim 1, characterized in that, Each of the first polarization units includes a plurality of first polarization sub-units arranged at intervals along the length direction of the first polarization unit, the first polarization sub-units are columnar structures, and the orthographic projection of the first polarization sub-units on the substrate is a polygon or an arc.

16. A display panel, characterized in that, The display panel includes: A substrate; and, A plurality of light-emitting devices as described in any one of claims 1 to 15, the plurality of light-emitting devices being disposed on one side of the substrate; wherein the plurality of light-emitting devices include light-emitting devices that emit light of different colors.

17. The display panel according to claim 16, wherein, The grating parameters of the first polarizing layer and / or the second polarizing layer in the plurality of light-emitting devices that emit light of different colors are different, and the grating parameters include at least one of the following: the number of polarizing units, the grating period width of the grating, the width of each polarizing unit along the arrangement direction of the polarizing units, and the width of each polarizing unit along the direction perpendicular to the arrangement direction of the polarizing units.

18. A method for preparing a light-emitting device, characterized in that, The method includes: Providing a substrate; Forming a light-emitting layer on one side of the substrate; Forming a first polarizing layer on the side of the light-emitting layer close to the substrate, wherein the first polarizing layer includes a plurality of first polarizing units, and each first polarizing unit includes a first portion on the side away from the light-emitting layer and a second portion on the side close to the light-emitting layer, and the cross-sectional shapes of the first portion and the second portion along the plane perpendicular to the substrate are different; Forming a second polarizing layer, the second polarizing layer including a photon polarization layer, the photon polarization layer being disposed on the side of the light-emitting layer away from the substrate, or the photon polarization layer being disposed on the side of the light-emitting layer close to the substrate, the photon polarization layer including a plurality of second polarizing units, and the arrangement directions of the plurality of second polarizing units are different from those of the plurality of first polarizing units.

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