Display panel and display device

Abstract

The invention discloses a display panel and a display device. The display panel comprises a driving substrate and a plurality of light-emitting units located on one side of the driving substrate. The light-emitting unit comprises a light-emitting element and a color conversion structure, and the color conversion structure is located on the side, away from the driving substrate, of the light-emitting element. The color conversion structure comprises a first surface, and the extending direction of the plane where the first surface is located is parallel to the extending direction of the plane where the driving substrate is located. Wherein the first surface of at least part of the color conversion structures comprises a plurality of microstructures, and the arrangement densities of the microstructures on at least two color conversion structures are different. Through the arrangement of the microstructure, the light conversion efficiency of the color conversion structure on the emergent light of the light-emitting element can be improved, so that the emergent light quantity of the light-emitting unit is increased, and the display brightness of the display panel is improved. By differentially designing the microstructure arrangement density of the color conversion structures in the different light-emitting units, the consistency of the brightness of the different light-emitting units can be improved, so that the display uniformity is improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] Micro-Light Emitting Diode (Micro-LED) has attracted attention in the field of display applications due to its advantages such as high contrast, low power consumption, long life, wide color gamut, high dynamic range and fast response. In a Micro-LED display panel, a color conversion structure can be set on the light-emitting side of the Micro-LED chip, and the color conversion structure converts the light emitted by the Micro-LED chip to achieve full-color display of the display panel. In the prior art, Micro-LED display panels have the problem of insufficient display brightness and poor uniformity. Summary of the invention

[0003] The present invention provides a display panel and a display device to improve the display brightness and display uniformity of the display panel.

[0004] In a first aspect, an embodiment of the present invention provides a display panel, comprising a driving substrate and a plurality of light-emitting units located on one side of the driving substrate;

[0005] The light-emitting unit includes a light-emitting element and a color conversion structure, wherein the color conversion structure is located on a side of the light-emitting element away from the driving substrate; the color conversion structure includes a first surface, wherein the extension direction of the plane where the first surface is located is parallel to the extension direction of the plane where the driving substrate is located;

[0006] Wherein, at least part of the first surface of the color conversion structure includes a plurality of microstructures, and at least two of the color conversion structures have different arrangement densities of the microstructures.

[0007] In a second aspect, an embodiment of the present invention provides a display device, comprising the display panel according to the first aspect of the present invention.

[0008] The display panel provided by the embodiment of the present invention includes a driving substrate and a plurality of light-emitting units located on one side of the driving substrate; the light-emitting unit includes a light-emitting element and a color conversion structure, and the color conversion structure is located on the side of the light-emitting element away from the driving substrate; the color conversion structure includes a first surface, and the extension direction of the plane where the first surface is located is parallel to the extension direction of the plane where the driving substrate is located; wherein, the first surface of at least part of the color conversion structure includes a plurality of microstructures, and at least two color conversion structures have different arrangement densities of the microstructures. By setting the microstructure, the light conversion efficiency of the color conversion structure for the light output of the light-emitting element can be improved, thereby increasing the light output of the light-emitting unit and improving the display brightness of the display panel. By differentially designing the microstructure arrangement density of the color conversion structure in different light-emitting units, the consistency of the light-emitting brightness of different light-emitting units can be improved, thereby improving the display uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0010] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A;

[0011] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along B-B';

[0012] Figure 4 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0013] Figure 5 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0014] Figure 6 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0015] Figure 7 for Figure 6 A schematic diagram of the enlarged structure at C;

[0016] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along the D-D' direction;

[0017] Fig. 9 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention;

[0018] Fig.10 for Fig. 9 Schematic diagram of the cross-section structure along E-E';

[0019] Fig.11A schematic diagram of a color conversion structure provided by an embodiment of the present invention;

[0020] Fig.12 for Fig.11 Schematic diagram of the cross-section structure along F-F';

[0021] Fig.13 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0022] Fig.14 A schematic cross-sectional structure diagram of another display panel provided by an embodiment of the present invention;

[0023] Fig.15 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0025] It should be noted that the words “having”, “including”, “comprising”, etc. described in this application are all open-ended meanings, that is, when describing that a module “has”, “including”, or “comprising” a first element, a second element, and / or a third element, it means that the module includes other elements in addition to the first element, the second element, and / or the third element. In addition, ordinal numbers such as “first”, “second”, and “third” in this application are not intended to limit a specific order, but are only used to distinguish various parts.

[0026] Figure 1 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention, Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A. Figure 3 for Figure 2 Schematic diagram of the cross-section structure along B-B', refer to Figure 1-Figure 3 In an embodiment of the present invention, the display panel includes a driving substrate 10 and a plurality of light-emitting units 20 located on one side of the driving substrate 10; the light-emitting unit 20 includes a light-emitting element 30 and a color conversion structure 40, and the color conversion structure 40 is located on a side of the light-emitting element 30 away from the driving substrate 10; the color conversion structure 40 includes a first surface 401, and the extension direction of the plane where the first surface 401 is located is parallel to the extension direction X of the plane where the driving substrate 10 is located; wherein the first surface 401 of at least part of the color conversion structure 40 includes a plurality of microstructures 50, and the arrangement density of the microstructures 50 on at least two color conversion structures 40 is different.

[0027] like Figure 1-Figure 3 As shown, the driving substrate 10 may include a base substrate and a driving array layer located on one side of the base substrate, the driving array layer includes a plurality of pixel driving circuits, and the pixel driving circuits are electrically connected to the light emitting element 30 to drive the light emitting element 30 to emit light. The driving substrate 10 may include a receiving pad 60, and the receiving pad 60 is electrically connected to the light emitting element 30. Figure 3 The specific structure of the driving substrate 10 is not shown in the figure, and those skilled in the art can design the arrangement of the pixel driving circuits in the driving substrate 10 according to actual needs.

[0028] One side of the driving substrate 10 includes a plurality of light-emitting units 20 arranged in an array, and the light-emitting units 20 emit light to display an image. The light-emitting unit 20 includes a light-emitting element 30 and a color conversion structure 40 located on the light-emitting side of the light-emitting element 30. Along the thickness direction Z of the driving substrate 10, the color conversion structure 40 at least partially overlaps with the light-emitting element 30. The color conversion structure 40 can be used to perform color conversion on the light emitted by the light-emitting element 30, thereby converting the light emitted by the light-emitting element 30 into light of a desired color. The surface of the color conversion structure 40 facing away from the light-emitting element 30 is the light-emitting surface of the light-emitting unit 20.

[0029] Among them, at least some of the light-emitting elements 30 in the display panel can emit light of the same color. By setting different color conversion structures 40 on some different light-emitting elements 30, multi-color light emission can be realized to achieve full-color display. The light-emitting elements 30 can be Micro-LED chips, and at least some of the Micro-LED chips emit light of the same color. The light-emitting elements 30 with the same light color can be transferred to the driving substrate 10 at the same time, thereby reducing the difficulty of transferring the light-emitting elements 30.

[0030] The color conversion structure 40 may include a first surface 401, and the first surface 401 refers to a surface of the color conversion structure 40 parallel to the extension direction X of the plane where the driving substrate 10 is located. It can be understood that in the extension direction X of the plane where the driving substrate 10 is located, the color conversion structure 40 includes two surfaces arranged opposite to each other, one of which faces the light-emitting element 30, and the other faces away from the light-emitting element 30. In the embodiment of the present invention, the first surface 401 may refer to at least one of the two surfaces. Figure 3 In the figure, the first surface 401 is away from the light emitting element 30 as an example, but the present invention is not limited thereto.

[0031] Furthermore, if Figure 2 and Figure 3As shown, a plurality of microstructures 50 are disposed on at least a portion of the first surface 401 of the color conversion structure 40. By disposing a plurality of microstructures 50, the first surface 401 of the color conversion structure 40 is made a rough surface, so that the light emitting angle of the light emitting element 30 is adjusted by using the microstructures 50, and the total internal reflection of the emitted light of the light emitting element 30 on the first surface 401 is avoided, and the light conversion efficiency of the color conversion structure 40 on the light emitting element 30 is improved, thereby increasing the light emitting amount of the light emitting unit 20 on its light emitting surface, and improving the display brightness of the display panel.

[0032] Optionally, the microstructure 50 is a convex structure or a concave structure on the first surface 401. The shape of the convex structure or the concave structure is not limited. Figure 3 The microstructure 50 is exemplarily shown as a conical protruding structure on the first surface 401, but is not limited thereto. In other embodiments, the microstructure 50 may be any polygonal, hemispherical, or cylindrical protruding or recessed structure.

[0033] The inventors have found that the reason for the uneven display of the display panel is that the light luminance of different light emitting units 20 is different. Figure 2 and Figure 3 , this embodiment proposes that the arrangement density of the microstructure 50 on at least two different color conversion structures 40 is different, that is, the arrangement density of the microstructure 50 on the first surface 401 of the color conversion structure 40 in at least two different light-emitting units 20 is different. The arrangement density of the microstructure 50 affects the propagation of light on the first surface 401, thereby affecting the light output of the light-emitting unit 20. In this way, the arrangement density of the microstructure 50 of the color conversion structure 40 in different light-emitting units 20 can be differentiated according to actual conditions, so as to improve the consistency of the light luminance of different light-emitting units 20, thereby improving the display uniformity.

[0034] For example, it is found that when the arrangement density of the microstructures 50 on the first surface 401 is greater, the microstructures 50 improve the light extraction efficiency more significantly, that is, the greater the light output of the color conversion structure 40, the higher the brightness of the light-emitting unit 20, and vice versa. In this embodiment, the arrangement density of the microstructures 50 in the light-emitting unit 20 with lower light brightness in the display panel can be set to be greater than the arrangement density of the microstructures 50 in the light-emitting unit 20 with higher light brightness, so as to ensure that the light brightness of different light-emitting units 20 tends to be consistent.

[0035] In an embodiment of the present invention, the display panel includes a driving substrate and a plurality of light-emitting units located on one side of the driving substrate; the light-emitting unit includes a light-emitting element and a color conversion structure, and the color conversion structure is located on the side of the light-emitting element away from the driving substrate; the color conversion structure includes a first surface, and the extension direction of the plane where the first surface is located is parallel to the extension direction of the plane where the driving substrate is located; wherein, the first surface of at least part of the color conversion structure includes a plurality of microstructures, and at least two color conversion structures have different arrangement densities of the microstructures. By setting the microstructure, the light conversion efficiency of the color conversion structure for the light output of the light-emitting element can be improved, thereby increasing the light output of the light-emitting unit and improving the display brightness of the display panel. By differentially designing the microstructure arrangement density of the color conversion structure in different light-emitting units, the difference in light output brightness caused by the position and / or color of the color conversion structure can be compensated, and the consistency of the light output brightness of different light-emitting units can be improved, thereby improving the display uniformity.

[0036] Optional, you can continue to refer to Figure 2 and Figure 3 The display panel includes light-emitting units 20 that emit light of different colors; in at least two light-emitting units 20 that emit light of different colors, the arrangement density of the microstructures 50 on the color conversion structure 40 is different.

[0037] The color conversion structure 40 may include a color conversion material and an organic medium, wherein the color conversion material is distributed in the organic medium, and the color conversion material may be a quantum dot material. When the light from the light emitting element 30 irradiates the color conversion structure 40, the color conversion structure 40 is excited into light of a corresponding color, completing the color conversion process.

[0038] When the color conversion material is a quantum dot material, the luminous color of the light-emitting unit 20 is affected by the size and material of the quantum dots. When the quantum dot particle size is smaller, the luminous color is more blue; when the quantum dot particle size is larger, the luminous color is more red. The color conversion structures 40 in different light-emitting units 20 can be defined as color conversion structures 40 of different colors. The inventors have found that the light power of the light excited by the quantum dot materials in the color conversion structures 40 of different colors is different. In other words, there is a difference in the light power of the light emitted by the light-emitting element 30 after passing through the color conversion structures 40 of different colors, which causes the light brightness of the light-emitting units 20 of different colors to be different.

[0039] Therefore, the embodiment of the present invention proposes that the arrangement density of the microstructures 50 on the color conversion structures 40 of different colors can be set to be different to compensate for the difference in luminous brightness caused by different excitation light powers of the color conversion material and improve the brightness uniformity of the light-emitting unit 20.

[0040] Exemplarily, the light-emitting unit 20 includes a first light-emitting unit 201 and a second light-emitting unit 202, and the light-emitting colors of the light-emitting elements 30 of the first light-emitting unit 201 and the second light-emitting unit 202 are the same; the first light-emitting unit 201 includes a first color conversion structure 40a, and the second light-emitting unit 202 includes a second color conversion structure 40b. The light emitted by the light-emitting element 30 emits a first color light after passing through the first color conversion structure 40a, and emits a second color light after passing through the second color conversion structure 40b. The central wavelength of the first color light is greater than the central wavelength of the second color light; the first color conversion structure 40a includes a first microstructure 501, and the second color conversion structure 40b includes a second microstructure 502. The arrangement density of the second microstructure 502 is greater than the arrangement density of the first microstructure 501.

[0041] The first light-emitting unit 201 and the second light-emitting unit 202 are two light-emitting units 20 of different colors. Generally, the display panel includes light-emitting units 20 of three colors: red, green, and blue. The three colors of light can be combined to form multiple colors of light. In this embodiment, the central wavelength of the first color light is greater than the central wavelength of the second color light, the first color light can be red light, the second color light can be green light, the first color conversion structure 40a can include red quantum dots, and the second color conversion structure 40b can include green quantum dots.

[0042] The light emitting elements 30 in the first light emitting unit 201 and the second light emitting unit 202 may be the same, that is, the light emitting elements 30 in the first light emitting unit 201 and the second light emitting unit 202 emit light of the same color. The light emitting color of the light emitting element 30 may be different from the first color and the second color, for example, the light emitting element 30 may be a blue light Micro-LED chip or an ultraviolet light Micro-LED chip.

[0043] The inventor has found that for the first light-emitting unit 201 and the second light-emitting unit 202, the longer the wavelength of the light excited by the color conversion structure 40, the greater the optical power, that is, the optical power of the red light excited by the red quantum dots is greater than the optical power of the green light excited by the green quantum dots. Therefore, in this embodiment, the arrangement density of the microstructure 50 (i.e., the first microstructure 501) on the first color conversion structure 40a can be set to be less than the arrangement density of the microstructure 50 (i.e., the second microstructure 502) on the second color conversion structure 40b. By increasing the arrangement density of the second microstructure 502 on the second color conversion structure 40b, the light conversion efficiency of the second color conversion structure 40b is increased, thereby improving the light output brightness of the second light-emitting unit 202, thereby compensating for the problem of different light-emitting brightness caused by different quantum dot excitation efficiencies, and improving the consistency of light-emitting brightness of different light-emitting units 20.

[0044] Optional, you can continue to refer to Figure 2 and Figure 3In a possible embodiment, the light-emitting unit 20 further includes a third light-emitting unit 203, and the light-emitting color of the third light-emitting unit 203 is the same as that of the light-emitting element 30 of the first light-emitting unit 201; the third light-emitting unit 203 includes a third color conversion structure 40c, and the light emitted by the light-emitting element 30 emits a third color light after passing through the third color conversion structure 40c, and the central wavelength of the third color light is smaller than the central wavelength of the second color light; the third color conversion structure 40c includes a third microstructure 503, and the arrangement density of the third microstructure 503 is greater than the arrangement density of the second microstructure 502.

[0045] In this embodiment, the light emitting element 30 may be an ultraviolet light Micro-LED chip, the third color light may be blue light, and the third color conversion structure 40c may include blue quantum dots, and the optical power of the blue light stimulated by the blue quantum dots is less than the optical power of the green light stimulated by the green quantum dots. Therefore, in this embodiment, it can be set that the arrangement density of the microstructure 50 (third microstructure 503) on the third color conversion structure 40c is greater than the arrangement density of the microstructure 50 (i.e., the second microstructure 502) on the second color conversion structure 40b, that is, the arrangement density of the third microstructure 503 is the largest, the arrangement density of the second microstructure 502 is the second, and the arrangement density of the first microstructure 501 is the smallest, so as to ensure that the light luminance of the three light emitting units 20 tends to be consistent.

[0046] Optional, Figure 4 A schematic cross-sectional structure diagram of another display panel provided in an embodiment of the present invention, Figure 4 In the illustrated embodiment, the light-emitting unit 20 also includes a third light-emitting unit 203, and the light-emitting color of the third light-emitting unit 203 is the same as that of the light-emitting element 30 of the first light-emitting unit 201; the third light-emitting unit 203 includes a third color conversion structure 40c, and the light emitted by the light-emitting element 30 emits a third color light after passing through the third color conversion structure 40c, and the central wavelength of the third color light is smaller than the central wavelength of the second color light; the third color conversion structure 40c includes a third microstructure 503, and the arrangement density of the third microstructure 503 is smaller than the arrangement density of the first microstructure 501.

[0047] Figure 4 The embodiment shown and Figure 3 The embodiment shown differs in that Figure 4 In the embodiment shown, the light emitting element 30 may be a blue light Micro-LED chip, and the light emitted by the light emitting element 30 is the third color light. The third color conversion structure 40c may include a transparent material, and the light emitting element 30 does not need to be excited and converted at the third color conversion structure 40c. Therefore, the light power of the light emitting element 30 emitted through the transparent material is the largest.

[0048] Based on this, the arrangement density of the microstructure 50 (the third microstructure 503) on the third color conversion structure 40c can be set to be smaller than the arrangement density of the microstructure 50 (i.e., the first microstructure 501) on the first color conversion structure 40a, that is, the arrangement density of the second microstructure 502 is the largest, the arrangement density of the first microstructure 501 is the second, and the arrangement density of the third microstructure 503 is the smallest, so as to ensure that the luminous brightness of the three light-emitting units 20 tends to be consistent.

[0049] Optional, Figure 5 A cross-sectional structural diagram of another display panel provided by an embodiment of the present invention is shown in FIG. Figure 5 In other embodiments, at least two light-emitting units 20 with different light-emitting colors may be provided, and the sizes of the microstructure 50 on the color conversion structure 40 are different; the size of the microstructure 50 includes at least one of the area of ​​the positive projection figure of the microstructure 50 on the plane where the driving substrate 10 is located, the height of the microstructure 50 in the thickness direction Z of the driving substrate, and the inclination angle of the side wall of the microstructure 50 relative to the plane where the driving substrate 10 is located.

[0050] In this embodiment, the light-emitting unit 20 may still include a first light-emitting unit 201, a second light-emitting unit 202, and a third light-emitting unit 203 that emit light of different colors. The light-emitting elements 30 of the first light-emitting unit 201, the second light-emitting unit 202, and the third light-emitting unit 203 emit the same light color. The first light-emitting unit 201 emits a first color light, the second light-emitting unit 202 emits a second color light, and the third light-emitting unit 203 emits a third color light.

[0051] In addition to the arrangement density of the microstructures 50, parameters such as the size of the microstructures 50 can also affect the light conversion efficiency of the color conversion structure 40, thereby affecting the luminous brightness of the light-emitting unit 20. Therefore, in this embodiment, the sizes of the microstructures 50 on the color conversion structures 40 of different colors can be limited to be different. By differentially setting the sizes of the microstructures 50, the luminous brightness differences caused by the different excitation light powers of the color conversion materials can be compensated, and the luminous brightness uniformity of the light-emitting units 20 of different colors can be improved.

[0052] The size of the microstructure 50 includes but is not limited to the area of ​​the orthographic projection of the microstructure 50 on the plane where the driving substrate 10 is located, the height in the thickness direction Z of the driving substrate, and the inclination angle of the side wall of the microstructure 50 relative to the plane where the driving substrate 10 is located. Taking the protruding microstructure 50 as an example, the area of ​​the orthographic projection of the microstructure 50 on the plane where the driving substrate 10 is located may be the area of ​​the bottom surface of the microstructure 50 (i.e., facing the first surface 401), the height of the microstructure 50 in the thickness direction Z of the driving substrate may be the height of the microstructure 50 protruding from the first surface 401, and the inclination angle of the side wall of the microstructure 50 relative to the plane where the driving substrate 10 is located may be the angle between the side surface of the microstructure 50 and the first surface 401. The area of ​​the orthographic projection of the microstructure 50 on the plane where the driving substrate 10 is located may be defined as the area of ​​the microstructure 50, the height of the microstructure 50 in the thickness direction Z of the driving substrate may be defined as the height of the microstructure 50, and the inclination angle of the side wall of the microstructure 50 relative to the plane where the driving substrate 10 is located may be defined as the side wall angle of the microstructure 50.

[0053] The specific scheme for differentiating the sizes of the microstructures 50 in the light-emitting units 20 of different colors can be set by those skilled in the art according to actual conditions.

[0054] The inventors found in actual research that when the area of ​​the microstructure 50 is within a certain preset area range, the microstructure 50 has a better effect on improving the light extraction efficiency. When it exceeds the preset area range, the effect of improving the light extraction efficiency of the microstructure 50 decreases. Correspondingly, when the height of the microstructure 50 is within a certain preset height range, the microstructure 50 has a better effect on improving the light extraction efficiency. When it exceeds the preset height range, the effect of improving the light extraction efficiency of the microstructure 50 decreases. When the side wall angle of the microstructure 50 is within a certain preset angle range, the microstructure 50 has a better effect on improving the light extraction efficiency. When it exceeds the preset angle range, the effect of improving the light extraction efficiency of the microstructure 50 decreases.

[0055] For example, taking the light emitting element 30 as an ultraviolet light Micro-LED chip, as described above, the light power of the red light excited by the red quantum dots is greater than the light power of the green light excited by the green quantum dots, and the light power of the green light excited by the green quantum dots is greater than the light power of the blue light excited by the blue quantum dots. On this basis, the area of ​​the third microstructure 503 can be set to be within the preset area range, and the areas of the first microstructure 501 and the second microstructure 502 can exceed the preset area range, or the height of the third microstructure 503 can be set to be within the preset height range, and the height of the first microstructure 501 and the second microstructure 502 can exceed the preset height range, or the side wall angle of the third microstructure 503 can be set to be within the preset angle range, and the side wall angle of the first microstructure 501 and the second microstructure 502 can exceed the preset angle range, so as to increase the light extraction efficiency of the third color conversion structure 40c and ensure that the brightness of the third light emitting unit 203 is close to that of the first light emitting unit 201 and the second light emitting unit 202.

[0056] Figure 5 The figure only shows that the sizes of the first microstructure 501, the second microstructure 502 and the third microstructure 503 are different, which does not represent a specific size differentiation design scheme. In practical applications, those skilled in the art can set the sizes of the first microstructure 501, the second microstructure 502 and the third microstructure 503 according to actual conditions.

[0057] Optionally, in some embodiments, the preset area range may be 0.5-2 μm, the preset height range may be 0.5-2 μm, and the preset angle range may be 40-70°, but are not limited thereto.

[0058] Optional, Figure 6 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention, Figure 7 for Figure 6 Schematic diagram of the enlarged structure at C, Figure 8 for Figure 7 The cross-sectional structure diagram along the D-D' direction can be referred to Figure 6-Figure 8 In a possible embodiment, the display panel includes a first display area AA1 and a second display area AA2 surrounding the first display area AA1; the light-emitting unit 20 includes a fourth light-emitting unit 204 and a fifth light-emitting unit 205, the fourth light-emitting unit 204 is located in the first display area AA1, and the fifth light-emitting unit 205 is located in the second display area AA2; the color conversion structure 40 of the fourth light-emitting unit 204 includes a fourth microstructure 504, and the color conversion structure 40 of the fifth light-emitting unit 205 includes a fifth microstructure 505, and the arrangement density of the fourth microstructure 504 is less than the arrangement density of the fifth microstructure 505.

[0059] like Figure 6As shown, the display panel further includes a non-display area NA, which is located on the side of the second display area AA2 away from the first display area AA1. The first display area AA1 can be regarded as the middle display area, and the second display area AA2 can be regarded as the edge display area. The fourth light-emitting unit 204 is a portion of the light-emitting unit 20 close to the middle area of ​​the display panel, and the fifth light-emitting unit 205 is a portion of the light-emitting unit 20 close to the edge of the display panel. Figure 6 FIG. 2 exemplarily shows that the fifth light-emitting unit 205 only includes a circle of light-emitting units 20 at the outermost portion, but the present invention is not limited thereto.

[0060] The inventors found that due to the viewing angle problem of the light-emitting element 30 itself, the brightness of the display panel will change with the change of the observation angle. At a large viewing angle, the brightness of the light-emitting unit 20 at the edge of the display panel is relatively small, affecting the overall brightness uniformity of the display panel.

[0061] Based on this, the present embodiment proposes that the arrangement density of the microstructure 50 (fifth microstructure 505) in the fifth light-emitting unit 205 can be set greater than the arrangement density of the microstructure 50 (fourth microstructure 504) in the fourth light-emitting unit 204, so as to improve the problem of uneven display brightness at the center and edge of the display panel under a wide viewing angle and enhance the display effect.

[0062] Optionally, in other embodiments, the sizes of the fourth microstructure 504 and the fifth microstructure 505 may be set differently, for example, the area (height and / or sidewall angle) of the fifth microstructure 505 may be set within a preset area range (preset height range and / or preset angle range), and the area (height and / or sidewall angle) of the fourth microstructure 504 may exceed the preset area range (preset height range and / or preset angle range). The effect of improving the light brightness of the edge light-emitting unit 20 can also be achieved.

[0063] Fig. 9 A schematic diagram of the structure of another display panel provided by an embodiment of the present invention, Fig.10 for Fig. 9 The cross-sectional structure diagram along E-E' can be referred to Fig. 9 and Fig.10 In a possible embodiment, the light-emitting element 30 includes a light-emitting area 301 and a non-light-emitting area 302, the first surface 401 includes a first area 402 and a second area 403, and along the thickness direction Z of the driving substrate 10, the light-emitting area 301 overlaps with the first area 402, and the non-light-emitting area 302 overlaps with the second area 403; on the same color conversion structure 40, the arrangement density of the microstructure 50 in the first area 402 is less than the arrangement density of the microstructure 50 in the second area 403.

[0064] like Fig. 9 and Fig.10As shown, the light-emitting area 301 and the non-light-emitting area 302 of the light-emitting element 30 may be arranged along the extension direction X of the plane where the driving substrate 10 is located, and the light-emitting material is disposed in the light-emitting area 301, and the light-emitting material is not disposed in the non-light-emitting area 302. The first surface 401 of the color conversion structure 40 may include a first area 402 and a second area 403, and the first area 402 and the second area 403 are arranged along the extension direction X of the plane where the driving substrate 10 is located. In the thickness direction Z of the driving substrate 10, the first area 402 overlaps with the light-emitting area 301, and the second area 403 overlaps with the non-light-emitting area 302. Since the first area 402 overlaps with the light-emitting area 301, the brightness of the light emitted by the light-emitting element 30 in the first area 402 is greater than the brightness of the second area 403.

[0065] like Fig. 9 and Fig.10 As shown, the arrangement density of the microstructures 50 in the first area 402 can be set to be smaller than that in the second area 403. In this way, the light efficiency improved by the microstructures 50 in the second area 403 can be greater than the light efficiency improved in the first area 402, thereby improving the problem of uneven light emitting brightness of the light emitting element 30 in the light emitting area 301 and the non-light emitting area 302, and ensuring the consistency of light emitting brightness in different areas of the first surface 401 of the color conversion structure 40.

[0066] Optional, you can continue to refer to Fig. 9 and Fig.10 The light-emitting element 30 includes a first semiconductor layer 303, a light-generating layer 304, and a second semiconductor layer 305 stacked along a thickness direction Z of the driving substrate, wherein the first semiconductor layer 303 is located between the light-generating layer 304 and the driving substrate 10, and the second semiconductor layer 305 is located between the light-generating layer 304 and the color conversion structure 40; the light-emitting element 30 also includes a first electrode 306 and a second electrode 307, wherein the first electrode 306 is located on a side of the first semiconductor layer 303 facing the driving substrate 10 and bonded to the driving substrate 10, and the second electrode 307 is located on a side of the second semiconductor layer 305 facing the driving substrate 10 and bonded to the driving substrate 10; in the thickness direction Z of the driving substrate 10, the light-emitting area 301 is the area where the light-generating layer 304 is located, and the non-light-emitting area 302 is the area of ​​the light-emitting element 30 except the area where the light-generating layer 304 is located.

[0067] like Fig. 9 and Fig.10As shown, the first semiconductor layer 303 and the second semiconductor layer 305 are located on both sides of the light generating layer 304 along the thickness direction Z of the driving substrate, the second semiconductor layer 305 is close to the color conversion structure 40, and the first semiconductor layer 303 is close to the driving substrate 10. The light generating layer 304 is arranged on a part of the surface of the second semiconductor layer 305 facing the driving substrate 10, and the first semiconductor layer 303 covers the light generating layer 304. The area of ​​the orthographic projection figure of the light generating layer 304 on the plane where the driving substrate 10 is located is smaller than the area of ​​the orthographic projection figure of the second semiconductor layer 305 on the plane where the driving substrate 10 is located. The light generating layer 304 includes a luminescent material, for example, the light generating layer 304 can be a quantum well layer, but is not limited thereto.

[0068] The light-emitting element 30 may be a Micro-LED chip with a horizontal structure, and the first electrode 306 and the second electrode 307 of the light-emitting element 30 are located on the same side of the light-emitting element 30. Specifically, the first electrode 306 is located on the side of the first semiconductor layer 303 facing the drive substrate 10 and is bonded to the first pad 601 on the drive substrate 10, and the second electrode 307 is located on the side of the drive substrate 10 facing the drive substrate 10 and is bonded to the second pad 602 on the drive substrate 10. The second electrode 307 is located in the area of ​​the second semiconductor layer 305 where the light-generating layer 304 is not provided, and along the thickness direction Z of the drive substrate 10, the second electrode 307 does not overlap with the light-generating layer 304. In the thickness direction Z of the drive substrate, the area where the light-generating layer 304 and the second semiconductor layer 305 overlap is the light-emitting area 301 of the light-emitting element 30, and the other area is the non-light-emitting area 302.

[0069] Among them, one of the first electrode 306 and the second electrode 307 is the anode of the light-emitting element 30, and the other is the cathode of the light-emitting element 30. The first electrode 306 is in contact with the first semiconductor layer 303, and the second electrode 307 is in contact with the second semiconductor layer 305. Taking the first electrode 306 as the anode and the second electrode 307 as the cathode as an example, the first semiconductor layer 303 can be a p-type semiconductor layer, and the second semiconductor layer 305 can be an n-type semiconductor layer. The first electrode 306 and the second electrode 307 receive electrical signals, holes enter the light-generating layer 304 from the first semiconductor layer 303, and electrons enter the light-generating layer 304 from the second semiconductor layer 305. The electrons and holes are combined in the light-generating layer 304 to realize the light emission of the light-emitting element 30.

[0070] Further optional, Fig.11 A schematic diagram of a color conversion structure provided by an embodiment of the present invention, Fig.12 for Fig.11 The cross-sectional structure diagram along F-F' can be referred to Fig.11 and Fig.12In a possible embodiment, the light-emitting area 301 includes a first sub-light-emitting area 3011 and a second sub-light-emitting area 3012, the first sub-light-emitting area 3011 is located between the second sub-light-emitting area 3012 and the non-light-emitting area 302, the first area 402 includes a first sub-area 4021 and a second sub-area 4022, the first sub-area 4021 is located between the second sub-area 4022 and the second area 403; in the thickness direction Z of the driving substrate 10, the first sub-light-emitting area 3011 overlaps with the first sub-area 4021, and the second sub-light-emitting area 3012 overlaps with the second sub-area 4022; on the same color conversion structure 40, the arrangement density of the microstructure 50 in the first sub-area 4021 is greater than the arrangement density of the microstructure 50 in the second sub-area 4022.

[0071] like Fig.11 and Fig.12 As shown, the first sub-light-emitting region 3011 and the second sub-light-emitting region 3012 are arranged along the extension direction X of the plane where the driving substrate 10 is located, the first sub-light-emitting region 3011 is close to the non-light-emitting region 302, and the second sub-light-emitting region 3012 is located on the side of the first sub-light-emitting region 3011 away from the non-light-emitting region 302. Correspondingly, on the first surface 401, the first sub-region 4021 and the second sub-region 4022 are arranged along the extension direction X of the plane where the driving substrate 10 is located, the first sub-region 4021 is close to the second region 403, and the second sub-region 4022 is located on the side of the first sub-region 4021 away from the second region 403. In the thickness direction Z of the driving substrate 10, the first sub-light-emitting region 3011 overlaps with the first sub-region 4021, and the second sub-light-emitting region 3012 overlaps with the second sub-region 4022. Since the first sub-luminous region 3011 is close to the non-luminous region 302 , the light generated by the first sub-luminous region 3011 is more easily transmitted to the non-luminous region 302 , resulting in the luminous brightness of the first sub-luminous region 3011 being lower than that of the second sub-luminous region 3012 .

[0072] Based on this, the present embodiment proposes that the arrangement density of the microstructure 50 in the first sub-area 4021 may be greater than the arrangement density in the second sub-area 4022. Fig.11 and Fig.12, along the direction from the second area 403 to the first area 402 (i.e., the extension direction X of the plane where the driving substrate 10 is located in the figure), the arrangement density of the microstructures 50 on the same color conversion structure 40 gradually increases. For example, as shown in the figure, along the extension direction X of the plane where the driving substrate 10 is located, there is a first spacing W1 between two adjacent microstructures 50 in the second area 403, a second spacing W2 between two adjacent microstructures 50 in the first sub-area 4021, and a third spacing W3 between two adjacent microstructures 50 in the second sub-area 4022; W1<W2<W3. The light efficiency improved by the microstructure 50 in the first sub-area 4021 is greater than the light efficiency improved in the second sub-area 4022, and the light efficiency improved by the microstructure 50 in the second area 403 is greater than the light efficiency improved in the first sub-area 4021, further ensuring the consistency of the light brightness of different areas of the first surface 401 of the color conversion structure 40.

[0073] Optionally, in other embodiments, the sizes of the microstructures 50 in the first area 402 and the second area 403 of the color conversion structure 40 may be set differently. For example, the area (height and / or sidewall angle) of the microstructure 50 in the second area 403 may be set within a preset area range (preset height range and / or preset angle range), and the area (height and / or sidewall angle) of the microstructure 50 in the first area 402 may exceed the preset area range (preset height range and / or preset angle range). The effect of improving the luminous brightness of the second area 403 can also be achieved.

[0074] Optionally, the light-emitting unit 20 still includes a first light-emitting unit 201, a second light-emitting unit 202 and a third light-emitting unit 203 with different light-emitting colors, and the light-emitting elements 30 of the first light-emitting unit 201, the second light-emitting unit 202 and the third light-emitting unit 203 have the same light-emitting color; the first light-emitting unit 201 includes a first color conversion structure 40a, the second light-emitting unit 202 includes a second color conversion structure 40b, and the third light-emitting unit 203 includes a third color conversion structure 40c. The light emitted by the light-emitting element 30 emits a first color light after passing through the first color conversion structure 40a, emits a second color light after passing through the second color conversion structure 40b, and emits a third color light after passing through the third color conversion structure 40c; the central wavelength of the first color light is greater than the central wavelength of the second color light, and the central wavelength of the second color light is greater than the central wavelength of the second color light; the first color conversion structure 40a includes a first microstructure 501, and the first color conversion structure 40a includes a first microstructure 502. The two-color conversion structure 40b includes a second microstructure 502, and the third-color conversion structure 40c includes a third microstructure 503; the arrangement density of the first microstructure 501 in the first area 402 of the first color conversion structure 40a is less than the arrangement density of the second microstructure 502 in the first area 402 of the second color conversion structure 40b, and the arrangement density of the second microstructure 502 in the first area 402 of the second color conversion structure 40b is less than the arrangement density of the third microstructure 503 in the first area 402 of the third color conversion structure 40c; the arrangement density of the first microstructure 501 in the second area 403 of the first color conversion structure 40a is less than the arrangement density of the second microstructure 502 in the second area 403 of the second color conversion structure 40b, and the arrangement density of the second microstructure 502 in the second area 403 of the second color conversion structure 40b is less than the arrangement density of the third microstructure 503 in the second area 403 of the third color conversion structure 40c.

[0075] In this embodiment, the light emitting element 30 may be an ultraviolet light Micro-LED chip. As described above, the first color light may be red light, the second color light may be green light, and the third color light may be blue light. The optical power of the red light excited by the red quantum dots in the first color conversion structure 40a is greater than the optical power of the green light excited by the green quantum dots in the second color conversion structure 40b, and the optical power of the green light excited by the green quantum dots in the second color conversion structure 40b is greater than the optical power of the blue light excited by the blue quantum dots in the third color conversion structure 40c. Based on the density differentiation setting scheme of the microstructure 50 on the color conversion structures 40 of different colors in the above embodiment, the arrangement density of the microstructure 50 in each area on the different color conversion structures 40 can be further limited.

[0076] Exemplarily, each color conversion structure 40 includes a first area 402 and a second area 403. For the first color conversion structure 40a, the second color conversion structure 40b, and the first area 402 of the third color conversion structure 40c, the third microstructure 503 can be arranged with the largest arrangement density in the first area 402 of the third color conversion structure 40c, the second microstructure 502 can be arranged with the second density in the first area 402 of the second color conversion structure 40b, and the first microstructure 501 can be arranged with the smallest arrangement density in the first area 402 of the first color conversion structure 40a. For the second area 403 of the first color conversion structure 40a, the second color conversion structure 40b, and the third color conversion structure 40c, the third microstructure 503 can be arranged with the largest arrangement density in the second area 403 of the third color conversion structure 40c, the second microstructure 502 can be arranged with the second density in the second area 403 of the second color conversion structure 40b, and the first microstructure 501 can be arranged with the smallest arrangement density in the second area 403 of the first color conversion structure 40a. This ensures the consistency of light conversion efficiency of different color conversion structures 40 , and further improves the uniformity of light emitting units 20 of different light emitting units 20 .

[0077] Optional, you can continue to refer to Figure 3 The display panel also includes a color conversion defining layer 70, which is located on the side of the light emitting element 30 away from the driving substrate 10; the color conversion defining layer 70 includes a plurality of grooves 701, and in the thickness direction Z of the driving substrate 10, the grooves 701 overlap with the light emitting element 30, and the color conversion structure 40 is located in the grooves 701.

[0078] like Figure 3 As shown, the color conversion defining layer 70 is disposed on the side of the film layer where the light emitting element 30 is located away from the driving substrate 10, and the color conversion defining layer 70 includes a plurality of grooves 701, and the grooves 701 extend from the surface of the side of the color conversion defining layer 70 away from the light emitting element 30 to the film layer where the light emitting element 30 is located. Along the thickness direction Z of the driving substrate, the grooves 701 can be arranged corresponding to the light emitting element 30, and the grooves 701 overlap with the light emitting element 30. The grooves 701 serve as the accommodating grooves of the color conversion structure 40, and at least part of the structure of the color conversion structure 40 is located in the grooves 701, and the bottom of the color conversion structure 40 contacts the bottom of the grooves 701.

[0079] The groove 701 can be prepared by patterning processes such as nanoimprinting or photolithography, which is not limited in the embodiment of the present invention. By providing the groove 701 and preparing the color conversion structure 40 in the groove 701, the position of the color conversion structure 40 can be accurately defined, ensuring that the position of the color conversion structure 40 corresponds to the position of the light emitting element 30, thereby ensuring the light conversion efficiency.

[0080] Fig.13 A cross-sectional structural diagram of another display panel provided in an embodiment of the present invention can be referred to Fig.13,exist Fig.13 In the illustrated embodiment, the display panel further includes a color conversion defining layer 70, which is located on the side of the light emitting element 30 facing away from the driving substrate 10; the color conversion defining layer 70 includes a plurality of openings 702, and in the thickness direction Z of the driving substrate 10, the openings 702 overlap with the light emitting element 30, and the color conversion structure 40 is located in the openings 702.

[0081] Fig.13 In the illustrated embodiment, the color conversion defining layer 70 includes an opening 702 that penetrates the color conversion defining layer 70 along the thickness direction of the color conversion defining layer 70. Along the thickness direction Z of the driving substrate, the opening 702 is arranged corresponding to the light emitting element 30, and the opening 702 overlaps the light emitting element 30. The light emitting element 30 is exposed at the opening 702, and the opening 702 serves as a receiving groove for the color conversion structure 40. At least part of the structure of the color conversion structure 40 is located in the opening 702. In this arrangement, the bottom of the color conversion structure 40 contacts the top of the light emitting element 30, for example, it can contact the second semiconductor layer 305 of the light emitting element 30.

[0082] The advantage of this arrangement is that along the thickness direction Z of the driving substrate 10 , the distance between the color conversion structure 40 and the light generating layer 304 of the light emitting element 30 is closer, which is beneficial for the light generated by the light generating layer 304 to pass through the color conversion structure 40 , thereby improving the light conversion efficiency.

[0083] The quantum dot material may be filled into the opening 702 by inkjet printing or other processes, and then cured to obtain the color conversion structure 40 .

[0084] Fig.14 A schematic cross-sectional structure diagram of another display panel provided in an embodiment of the present invention can be combined with reference to Figure 3 and Fig.14 The first surface 401 is a side surface of the color conversion structure 40 facing away from the driving substrate 10 , or the first surface 401 is a side surface of the color conversion structure 40 facing the driving substrate 10 .

[0085] Figure 3 In the illustrated embodiment, the first surface 401 is a surface of the color conversion structure 40 facing away from the light emitting element 30 , and the microstructure 50 is disposed on the surface of the color conversion structure 40 facing away from the light emitting element 30 . Fig.14In the illustrated embodiment, the first surface 401 is a side surface of the color conversion structure 40 facing the light emitting element 30, and the microstructure 50 is disposed on the side surface of the color conversion structure 40 facing the light emitting element 30. Exemplarily, taking the color conversion structure 40 being located in the groove 701 of the color conversion defining layer 70 as an example, when the microstructure 50 is disposed on the side surface of the color conversion structure 40 facing away from the light emitting element 30, after the quantum dot material is cured, the microstructure 50 can be prepared on the first surface 401 of the color conversion structure 40 by a patterning process, so as to obtain the color conversion structure 40 with the microstructure 50 on the top. When the microstructure 50 is disposed on the side surface of the color conversion structure 40 facing the light emitting element 30, a micropattern can be prepared at the bottom of the groove 701 by a patterning process, and the micropattern is complementary to the shape of the microstructure 50, and then the quantum dot material is filled in the groove 701 and cured, so as to obtain the color conversion structure 40 with the microstructure 50 on the bottom.

[0086] Optional, you can continue to refer to Figure 3 The color conversion structure 40 also includes a second surface 404 arranged opposite to the first surface 401; in the thickness direction Z of the driving substrate 10, the portion of the color conversion structure 40 between the first surface 401 and the second surface 404 has a first height H1, and the microstructure 50 has a second height H2, and the first height H1 is greater than the second height H2.

[0087] like Figure 3 As shown, the second surface 404 is parallel to the first surface 401 , and the second surface 404 is a surface disposed opposite to the first surface 401 . Figure 3 In the example, the first surface 401 is away from the driving substrate 10, and the second surface 404 is toward the driving substrate 10, but it is not limited thereto. The portion of the color conversion structure 40 between the first surface 401 and the second surface 404 can be regarded as the main body of the color conversion structure 40, and the first height H1 can be understood as the thickness of the main body of the color conversion structure 40. In this embodiment, the thickness of the main body of the color conversion structure 40 can be set to be greater than the height of the microstructure 50. In this way, the problem of the microstructure 50 being too high to affect the brightness of the light can be avoided.

[0088] The specific settings of the first height H1 and the second height H2 are not limited in the embodiment of the present invention, and those skilled in the art may set them according to actual needs.

[0089] Optional, you can continue to refer to Figure 2 and Figure 3 , the orthographic projection area of ​​the color conversion structure 40 on the plane where the driving substrate 10 is located is larger than the orthographic projection area of ​​the light emitting element 30 on the plane where the driving substrate 10 is located.

[0090] Figure 3In the cross-sectional view shown, the color conversion structure 40 has a fourth width W4 along the extension direction X of the plane where the driving substrate 10 is located, and the light emitting element 30 has a fifth width W5 along the extension direction X of the plane where the driving substrate 10 is located, and W4>W5. By setting the orthographic projection graphic area of ​​the color conversion structure 40 to be larger than the orthographic projection graphic area of ​​the light emitting element 30, the color conversion structure 40 can cover the light emitting element 30 along the thickness direction Z of the driving substrate, ensuring that as much light as possible from the light emitting element 30 enters the color conversion structure 40, thereby improving the light brightness.

[0091] The display panel provided by the embodiment of the present invention may also include any film layer structure known to those skilled in the art, such as an encapsulation layer on the side of the color conversion structure away from the driving substrate, but is not limited thereto, and the embodiment of the present invention does not elaborate on or limit this.

[0092] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Fig.15 FIG. 1 is a schematic diagram of a display device provided by an embodiment of the present invention. Fig.15 As shown, the display device includes the display panel 100 provided by any embodiment of the present invention. Therefore, the display device provided by the embodiment of the present invention has the corresponding beneficial effects of the display panel provided by the embodiment of the present invention, which will not be repeated here. Exemplarily, the display device can be an electronic device such as a mobile phone, a computer, a smart wearable device (for example, a smart watch), and a car display device, which is not limited by the embodiment of the present invention.

[0093] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: It includes a driving substrate and a plurality of light-emitting units located on one side of the driving substrate; The light-emitting unit includes a light-emitting element and a color conversion structure, wherein the color conversion structure is located on a side of the light-emitting element away from the driving substrate; the color conversion structure includes a first surface, wherein the extension direction of the plane where the first surface is located is parallel to the extension direction of the plane where the driving substrate is located; Wherein, at least part of the first surface of the color conversion structure includes a plurality of microstructures, and at least two of the color conversion structures have different arrangement densities of the microstructures.

2. The display panel according to claim 1, characterized in that: The display panel includes light-emitting units that emit light of different colors; in at least two light-emitting units that emit light of different colors, the arrangement density of the microstructures on the color conversion structure is different.

3. The display panel according to claim 2, characterized in that: The light-emitting unit comprises a first light-emitting unit and a second light-emitting unit, and the light-emitting elements of the first light-emitting unit and the second light-emitting unit emit the same light color; The first light-emitting unit includes a first color conversion structure, the second light-emitting unit includes a second color conversion structure, the light emitted by the light-emitting element emits a first color light after passing through the first color conversion structure, and emits a second color light after passing through the second color conversion structure, and the central wavelength of the first color light is greater than the central wavelength of the second color light; The first color conversion structure includes a first microstructure, and the second color conversion structure includes a second microstructure, and an arrangement density of the second microstructure is greater than an arrangement density of the first microstructure.

4. The display panel according to claim 3, characterized in that: The light-emitting unit further comprises a third light-emitting unit, and the light-emitting color of the light-emitting element of the third light-emitting unit is the same as that of the light-emitting element of the first light-emitting unit; The third light-emitting unit includes a third color conversion structure, and the light emitted by the light-emitting element emits a third color light after passing through the third color conversion structure, and the central wavelength of the third color light is smaller than the central wavelength of the second color light; The third color conversion structure includes a third microstructure, and an arrangement density of the third microstructure is greater than an arrangement density of the second microstructure.

5. The display panel according to claim 3, characterized in that: The light-emitting unit further comprises a third light-emitting unit, and the light-emitting color of the light-emitting element of the third light-emitting unit is the same as that of the light-emitting element of the first light-emitting unit; The third light-emitting unit includes a third color conversion structure, and the light emitted by the light-emitting element emits a third color light after passing through the third color conversion structure, and the central wavelength of the third color light is smaller than the central wavelength of the second color light; The third color conversion structure includes a third microstructure, and an arrangement density of the third microstructure is smaller than an arrangement density of the first microstructure.

6. The display panel according to claim 2, characterized in that: In the light-emitting units having at least two different light-emitting colors, the sizes of the microstructures on the color conversion structure are different; the sizes of the microstructures include at least one of the area of ​​the orthographic projection figure of the microstructure on the plane where the driving substrate is located, the height of the microstructure in the thickness direction of the driving substrate, and the inclination angle of the side wall of the microstructure relative to the plane where the driving substrate is located.

7. The display panel according to claim 1, characterized in that: The display panel includes a first display area and a second display area surrounding the first display area; the light-emitting unit includes a fourth light-emitting unit and a fifth light-emitting unit, the fourth light-emitting unit is located in the first display area, and the fifth light-emitting unit is located in the second display area; The color conversion structure of the fourth light emitting unit includes a fourth microstructure, and the color conversion structure of the fifth light emitting unit includes a fifth microstructure. The arrangement density of the fourth microstructure is smaller than the arrangement density of the fifth microstructure.

8. The display panel according to claim 1, characterized in that: The light emitting element comprises a light emitting area and a non-light emitting area, the first surface comprises a first area and a second area, along the thickness direction of the driving substrate, the light emitting area overlaps with the first area, and the non-light emitting area overlaps with the second area; On the same color conversion structure, the arrangement density of the microstructures in the first area is smaller than the arrangement density of the microstructures in the second area.

9. The display panel according to claim 8, characterized in that: The light-emitting area includes a first sub-light-emitting area and a second sub-light-emitting area, the first sub-light-emitting area is located between the second sub-light-emitting area and the non-light-emitting area, the first area includes a first sub-area and a second sub-area, the first sub-area is located between the second sub-area and the second area; in the thickness direction of the drive substrate, the first sub-light-emitting area overlaps with the first sub-area, and the second sub-light-emitting area overlaps with the second sub-area; On the same color conversion structure, the arrangement density of the microstructures in the first sub-area is greater than the arrangement density of the microstructures in the second sub-area.

10. The display panel according to claim 8, characterized in that: The light-emitting unit comprises a first light-emitting unit, a second light-emitting unit and a third light-emitting unit having different light-emitting colors, and the light-emitting elements of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit have the same light-emitting color; The first light-emitting unit includes a first color conversion structure, the second light-emitting unit includes a second color conversion structure, and the third light-emitting unit includes a third color conversion structure. The light emitted by the light-emitting element emits a first color light after passing through the first color conversion structure, emits a second color light after passing through the second color conversion structure, and emits a third color light after passing through the third color conversion structure. The center wavelength of the first color light is greater than the center wavelength of the second color light, and the center wavelength of the second color light is greater than the center wavelength of the second color light. The first color conversion structure includes a first microstructure, the second color conversion structure includes a second microstructure, and the third color conversion structure includes a third microstructure; an arrangement density of the first microstructure in the first region of the first color conversion structure is less than an arrangement density of the second microstructure in the first region of the second color conversion structure, and an arrangement density of the second microstructure in the first region of the second color conversion structure is less than an arrangement density of the third microstructure in the first region of the third color conversion structure; an arrangement density of the first microstructure in the second region of the first color conversion structure is less than an arrangement density of the second microstructure in the second region of the second color conversion structure, and an arrangement density of the second microstructure in the second region of the second color conversion structure is less than an arrangement density of the third microstructure in the second region of the third color conversion structure.

11. The display panel according to claim 8, characterized in that: The light emitting element has a first semiconductor layer, a light generating layer, and a second semiconductor layer stacked along the thickness direction of the driving substrate, wherein the first semiconductor layer is located between the light generating layer and the driving substrate, and the second semiconductor layer is located between the light generating layer and the color conversion structure; The light emitting element further comprises a first electrode and a second electrode, the first electrode being located on a side of the first semiconductor layer facing the drive substrate and bonded to the drive substrate, and the second electrode being located on a side of the second semiconductor layer facing the drive substrate and bonded to the drive substrate; In the thickness direction of the driving substrate, the light emitting area is the area where the light generating layer is located, and the non-light emitting area is the area of ​​the light emitting element except the area where the light generating layer is located.

12. The display panel according to claim 1, characterized in that: The display panel further comprises a color conversion defining layer, wherein the color conversion defining layer is located on a side of the light emitting element away from the driving substrate; The color conversion defining layer includes a plurality of grooves, and in the thickness direction of the driving substrate, the grooves overlap with the light emitting elements, and the color conversion structures are located in the grooves.

13. The display panel according to claim 1, characterized in that: The first surface is a side surface of the color conversion structure facing away from the driving substrate, or the first surface is a side surface of the color conversion structure facing the driving substrate.

14. The display panel according to claim 1, characterized in that: The color conversion structure further includes a second surface disposed opposite to the first surface; In a thickness direction of the drive substrate, a portion of the color conversion structure between the first surface and the second surface has a first height, and the microstructure has a second height, and the first height is greater than the second height.

15. The display panel according to claim 1, characterized in that: The orthographic projection area of ​​the color conversion structure on the plane where the driving substrate is located is larger than the orthographic projection area of ​​the light emitting element on the plane where the driving substrate is located.

16. The display panel according to claim 1, characterized in that: The microstructure is a convex structure or a concave structure on the first surface.

17. A display device, characterized in that: A display panel comprising any one of claims 1-16.

Images