Light-emitting substrate and display module

Abstract

The application provides a light-emitting substrate and a display module. The light-emitting substrate comprises a light-emitting device arranged on a driving backboard and an optical microstructure arranged on a light-emitting path of the light-emitting device. The optical microstructure comprises a main body part and an auxiliary part protruding from the main body part. The auxiliary part is arranged on a light-emitting path of at least part of emitted light between a first light ray and a second light ray of the light-emitting device. The first light ray is a boundary light ray. The second light ray is perpendicular to a side surface of the main body part. At least part of the emitted light between the first light ray and the second light ray converges to a central light ray after passing through the side surface of the auxiliary part. The emitted light between the central light ray and the second light ray converges to the central light ray after passing through the side surface of the main body part. The light-emitting angle of the light-emitting device is converged, and the halo problem is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a light-emitting substrate and a display module. BACKGROUND

[0002] Light emitting diode (LED) as a kind of light emitting device is widely used in display field. With the development of display technology, the size of LED chip gradually becomes smaller, and small size LED chip such as mini light emitting diode (Mini LED) and micro light emitting diode (Micro LED) appears. For example, Mini LED has been widely used in display field due to its characteristics of high brightness, high contrast, high color saturation, low power consumption, fast response speed, long service life and so on. For example, Mini LED array can be arranged and manufactured into a light-emitting substrate, and the light-emitting substrate can be used as a backlight source of liquid crystal display (LCD), or the light-emitting substrate can also be directly used as a display panel for displaying images. However, there is light halo in the display of Mini LED, which affects the visual effect. SUMMARY

[0003] The present application provides a light-emitting substrate and a display module to alleviate the technical problem of light halo in the display of existing Mini LED.

[0004] To solve the above problems, the technical scheme provided by the present application is as follows:

[0005] The embodiment of the present application provides a light-emitting substrate, which comprises:

[0006] A driving backboard;

[0007] A light emitting device is arranged on the driving backboard, the emitted light of the light emitting device comprises first light, second light and central light, the first light is the boundary light of the emitted light, the central light is perpendicular to the light emitting surface of the light emitting device, and the second light is located between the first light and the central light;

[0008] An optical microstructure is disposed in a light emitting path of the light emitting device, the optical microstructure comprising a main body portion disposed corresponding to the light emitting device and an auxiliary portion protruding from a portion of the main body portion, the main body portion comprising a bottom surface disposed opposite to the light emitting device and a side surface surrounding the bottom surface, an included angle between the first side surface and the bottom surface being less than 90 degrees, the auxiliary portion being disposed on the first side surface, and the auxiliary portion being located at least in the light emitting path of the emergent light between the first light ray and the second light ray, the auxiliary portion comprising a side surface connected to the first side surface;

[0009] At least a portion of the emergent light between the first light ray and the second light ray converges toward the central light ray after passing through the second side surface; the second light ray is perpendicular to the first side surface, and the emergent light between the central light ray and the second light ray converges toward the central light ray after passing through the first side surface.

[0010] In the light emitting substrate provided by the embodiments of the present application, the second side surface comprises a first sub-side surface and a second sub-side surface connected to each other, the first sub-side surface is connected to the first side surface at a first intersection line, the second sub-side surface is connected to the first side surface at a second intersection line, the second intersection line is located on a side of the first intersection line away from the light emitting device, and an included angle between the first light ray and a first sub-side surface portion extending toward the second sub-side surface is greater than or equal to 90 degrees.

[0011] In the light emitting substrate provided by the embodiments of the present application, an emergent point of the first light ray on the first sub-side surface is a first emergent point, and the first emergent point is located on the first intersection line or on a side of the first intersection line close to the second intersection line.

[0012] In the light emitting substrate provided by the embodiments of the present application, the first side surface and the first bottom surface are connected to each other, an included angle between the first side surface and the first bottom surface is a first included angle, the first side surface comprises a third sub-side surface, the third sub-side surface is covered by the auxiliary portion, an included angle between the first sub-side surface and the third sub-side surface is a second included angle, and the second included angle satisfies the following relationship: wherein a and b are both greater than 0 degrees and less than 90 degrees, c is less than or equal to 180 degrees, a represents the first included angle, b represents the second included angle, and c represents a light emitting angle of the light emitting device.

[0013] In the light emitting substrate provided by the embodiments of the present application, an included angle between the second sub-side surface and the third sub-side surface is a third included angle, and the third included angle satisfies the following relationship: 70°≤d≤100°, wherein d represents the third included angle.

[0014] In the light-emitting substrate provided in the embodiments of the present application, the exit point of the second light on the first side surface is a second exit point, and the second exit point is located on the second intersection line.

[0015] In the light-emitting substrate provided in the embodiments of the present application, the second sub-side surface is perpendicular to the third sub-side surface.

[0016] In the light-emitting substrate provided in the embodiments of the present application, the exit point of the second light on the first side surface is a second exit point, and the second exit point is located on the side of the second intersection line away from the first intersection line; the first sub-side surface and the second sub-side surface intersect at a third intersection line, and the first exit light of the second light after passing through the main body part passes through the third intersection line.

[0017] In the light-emitting substrate provided in the embodiments of the present application, the area of the orthographic projection of the first sub-side surface on the first side surface is greater than the area of the orthographic projection of the second sub-side surface on the first side surface.

[0018] In the light-emitting substrate provided in the embodiments of the present application, the first sub-side surface and the second sub-side surface intersect at a third intersection line, and the perpendicular distance between the third intersection line and the plane where the first bottom surface is located is less than or equal to the height of the main body part.

[0019] In the light-emitting substrate provided in the embodiments of the present application, the orthographic projection of the main body part on the driving backboard is located within the orthographic projection of the light-emitting device on the driving backboard, and the auxiliary part surrounds the main body part; the light-emitting substrate further comprises a covering medium arranged on the optical microstructure, the refractive index of the main body part is greater than the refractive index of the covering medium, and the refractive index of the auxiliary part is greater than the refractive index of the covering medium.

[0020] In the light-emitting substrate provided in the embodiments of the present application, the refractive index of the auxiliary part is greater than or equal to the refractive index of the main body part, and the refractive index of the main body part is greater than or equal to 1.4.

[0021] In the light-emitting substrate provided in the embodiments of the present application, when the refractive index of the auxiliary part is equal to the refractive index of the main body part, the auxiliary part and the main body part are integrally arranged.

[0022] In the light-emitting substrate provided in the embodiments of the present application, the material of the main body part comprises at least one of silica gel and resin.

[0023] In the light-emitting substrate provided in the embodiments of the present application, the longitudinal cross-sectional shape of the main body part comprises a triangle, and the longitudinal cross-sectional shape of the auxiliary part comprises a triangle.

[0024] In the light-emitting substrate provided in the embodiments of the present application, the surface shape of the main body part comprises one of a pyramid, a cone, and an elliptical cone.

[0025] In the light-emitting substrate provided in the embodiments of the present application, the longitudinal section shape of the main body part is a first triangle, the longitudinal section shape of the auxiliary part is a second triangle, the first triangle is an isosceles triangle, the first triangle comprises a first side and two second sides of equal length connected to both ends of the first side, the first side is located on the light-emitting device, the second triangle is located on the second side, the second triangle comprises a third side located on the second side and a fourth side and a fifth side connected to both ends of the third side, the fourth side is located on a side of the fifth side close to the light-emitting device, and the included angle between the first light and the fourth side is greater than or equal to 90 degrees.

[0026] In the light-emitting substrate provided in the embodiments of the present application, the included angle between the first side and the second side is a first included angle, the included angle between the third side and the fourth side is a second included angle, and the included angle between the third side and the fifth side is a third included angle; the first included angle satisfies the following relationship: wherein a represents the first included angle, a is greater than 0 degrees and less than 90 degrees, D1 represents the length of the first side, and H represents the height of the main body part; the second included angle satisfies the following relationship: wherein b represents the second included angle, b is greater than 0 degrees and less than 90 degrees, c represents the light-emitting angle of the light-emitting device, and c is less than or equal to 180 degrees; and the third included angle satisfies the following relationship: 70°≤d≤100°, wherein d represents the third included angle.

[0027] In the light-emitting substrate provided in the embodiments of the present application, the exit point of the first light on the fourth side is a first exit point, the exit point of the second light on the second side is a second exit point, the third side intersects with the fourth side at a first intersection point, the third side intersects with the fifth side at a second intersection point, the first exit point coincides with the first intersection point or is located on a side of the first intersection point close to the second intersection point, and the second exit point coincides with the second intersection point; and the length of the third side satisfies the following relationship: wherein D2 represents the length of the third side.

[0028] The embodiments of the present application also provide a display module, which comprises the light-emitting substrate of any one of the foregoing embodiments.

[0029] The beneficial effects of the present application are: the light-emitting substrate and the display module provided by the present application, the light-emitting substrate comprises a light-emitting device arranged on a driving backboard and an optical microstructure arranged on a light-emitting path of the light-emitting device, the optical microstructure comprises a main body part and an auxiliary part protruding from the main body part, the auxiliary part is located at least on the light-emitting path of the emergent light between a first light ray and a second light ray of the light-emitting device, the first light ray is a boundary light ray, the second light ray is perpendicular to the side surface of the main body part, at least part of the emergent light between the first light ray and the second light ray converges to a central light ray after passing through the side surface of the auxiliary part, and the emergent light between the central light ray and the second light ray converges to the central light ray after passing through the side surface of the main body part; in this way, by arranging the optical microstructure, the large-angle emergent light of the light-emitting device can be converged to the central area of the light-emitting path, the light-emitting angle of the light-emitting device is converged, and the halo problem is improved. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0031] Figure 1 A schematic diagram of a planar structure of the light-emitting substrate provided by the embodiments of the present application.

[0032] Figure 2 For Figure 1 A schematic diagram of a cross-sectional structure along the direction of M-M' in the present application.

[0033] Figure 3 For Figure 2 A schematic diagram of a first three-dimensional structure of the light-emitting device and the optical microstructure in the present application.

[0034] Figure 4 For Figure 3 A schematic diagram of a first longitudinal cross-sectional structure of the light-emitting device and the optical microstructure in the present application.

[0035] Figure 5 For Figure 4 An enlarged schematic diagram of N in the present application.

[0036] Figure 6 A schematic diagram of a second longitudinal cross-sectional structure of the light-emitting device and the optical microstructure provided by the embodiments of the present application.

[0037] Figure 7 A schematic diagram of a third longitudinal cross-sectional structure of the light-emitting device and the optical microstructure provided by the embodiments of the present application.

[0038] Figure 8This is a schematic diagram of the fourth longitudinal cross-sectional structure of the light-emitting device and optical microstructure provided in an embodiment of the present application.

[0039] Figure 9 This is a schematic diagram of the fifth longitudinal cross-sectional structure of the light-emitting device and optical microstructure provided in the embodiments of the present application.

[0040] Figure 10 A schematic diagram of the second three-dimensional structure of the light-emitting device and optical microstructure provided in an embodiment of the present application.

[0041] Figure 11 This is a schematic diagram of the third three-dimensional structure of the light-emitting device and optical microstructure provided in the embodiments of the present application.

[0042] Figure 12 for Figure 4 Schematic diagram of the light-emitting angle of the medium optical microstructure convergent light-emitting device.

[0043] Figure 13 Schematic diagram of the halo definition range of the light-emitting device provided in an embodiment of the present application.

[0044] Figure 14 Schematic diagram of the halo test effect of the light-emitting device.

[0045] Figure 15 This is a schematic diagram of luminous intensity zoning when the light-emitting device is not provided with the optical microstructure of the present application.

[0046] Figure 16 It is a schematic diagram comparing the luminous intensity zones of a light-emitting device when the optical microstructure of the present application is provided and when the optical microstructure of the present application is not provided.

[0047] Figure 17 A schematic cross-sectional view of a display module according to an embodiment of the present application. DETAILED DESCRIPTION

[0048] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be implemented in. The directional terms mentioned in this application, such as [up], [down], [front], [back], [left], [right], [inside], [outside], [side], etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present application, rather than to limit the present application. In the figures, units with similar structures are represented by the same reference numerals. In the accompanying drawings, the thickness of some layers and areas is exaggerated for clarity of understanding and ease of description. That is, the size and thickness of each component shown in the drawings are arbitrarily shown, but the present application is not limited to this.

[0049] Please refer to Figures 1 to 5 , Figure 1 A schematic diagram of a planar structure of a light-emitting substrate provided in an embodiment of the present application is shown.Figure 2 For Figure 1 The schematic diagram of the cross-sectional structure along the direction of M-M' in the middle, Figure 3 For Figure 2 The schematic diagram of the first three-dimensional structure of the light-emitting device and the optical microstructure in the middle, Figure 4 For Figure 3 The schematic diagram of the first longitudinal cross-sectional structure of the light-emitting device and the optical microstructure in the middle, Figure 5 For Figure 4 The schematic diagram of the enlarged view at N in the middle. Referring to Figure 1 , the light-emitting substrate 100 includes a driving backboard 10 and a light-emitting device 20 disposed on the driving backboard 10. The driving backboard is provided with a driving circuit for driving the light-emitting device 20 to emit light.

[0050] Optionally, a plurality of light-emitting devices 20 are arranged in an array on the driving backboard 10 and are bound to the driving backboard 10. The driving backboard 10 can be silicon-based, PCB-based, glass-based, etc. The driving circuit on the driving backboard 10 can use active driving or passive driving to drive the light-emitting device 20 to emit light. The light-emitting device 20 includes a small-size LED chip such as a Mini Light Emitting Diode (Mini LED) and a Micro Light Emitting Diode (Micro LED).

[0051] Referring to Figure 2 and Figure 3 , the light-emitting substrate 100 further includes an optical microstructure 30 disposed on the light-emitting path of the light-emitting device 20. That is, the optical microstructure 30 is disposed on the light-emitting side of the light-emitting device 20, such as the optical microstructure 30 directly covering the light-emitting surface of the light-emitting device 20. Each optical microstructure 30 corresponds to one light-emitting device 20. The optical microstructure 30 includes a main body part 31 disposed corresponding to the light-emitting device 20 and an auxiliary part 32 protruding from part of the main body part 31.

[0052] The orthographic projection of the main body part 31 on the driving backboard 10 is located within the orthographic projection of the light-emitting device 20 on the driving backboard 10, that is, the main body part 31 covers the light-emitting device 20 but does not exceed the setting area of the light-emitting device 20. The main body part 31 includes a first bottom surface 312 disposed opposite to the light-emitting device 20 and a first side surface 311 surrounding the first bottom surface 312, and the included angle between the first side surface 311 and the first bottom surface 312 of the main body part 31 is less than 90 degrees.

[0053] Referring to Figure 3The auxiliary part 32 protrudes from the first side surface 311 of the main part 31, and surrounds the main part 31, for example, the auxiliary part 32 surrounds the main part 31 by one round, and the surface shape of the auxiliary part 32 is annular. The auxiliary part 32 comprises a second side surface connected to the first side surface 311 of the main part 31. The second side surface of the auxiliary part 32 is arranged intersecting the first side surface 311 of the main part 31. The second side surface of the auxiliary part 32 comprises a first sub-side surface 321 and a second sub-side surface 322 connected to each other, the first sub-side surface 321 is connected to the first side surface 311 of the main part 31 at a first intersection line 3211, and the second sub-side surface 322 is connected to the first side surface 311 of the main part 31 at a second intersection line, which is located on the side of the first intersection line 3211 away from the light emitting device 20. The first sub-side surface 321 intersects the second sub-side surface 322 at a third intersection line 3213.

[0054] The light emitting substrate 100 further comprises a covering medium arranged on the optical microstructure 30, the refractive index of the main part 31 is greater than the refractive index of the covering medium, and the refractive index of the auxiliary part 32 is greater than the refractive index of the covering medium. The covering medium comprises air or other medium covering the surface of the optical microstructure 30, such as a protective adhesive layer and the like. The refractive index of the auxiliary part 32 is greater than or equal to the refractive index of the main part 31, and the refractive index of the main part 31 is greater than or equal to 1.4, for example, the refractive index of the main part 31 is 1.4, 1.5, 1.6, 1.7 or the like. Optionally, when the refractive index of the auxiliary part 32 is equal to the refractive index of the main part 31, the auxiliary part 32 and the main part 31 are integrally arranged to enhance the bonding force between the auxiliary part 32 and the main part 31, and to ensure that the refractive index of the auxiliary part 32 is equal to the refractive index of the main part 31.

[0055] The material of the main part 31 comprises at least one of silica gel, resin and other high refractive index transparent materials. Taking silica gel as an example, the auxiliary part 32 and the main part 31 can be integrally arranged by the following method: applying silica gel glue on the light emitting surface of the light emitting device 20; using a designed mold to press the silica gel glue to shape; after the silica gel glue is cured and formed, demolding can obtain the integrally formed optical microstructure 30, and the auxiliary part 32 and the main part 31 are integrally arranged.

[0056] Of course, in other embodiments, the auxiliary part 32 can also be arranged separately from the main part 31, for example, the auxiliary part 32 can be arranged in close contact with the main part 31.

[0057] Referring to Figure 3 and Figure 4The surface shape of the main body 31 is a pyramid shape, such as a pyramid shape, that is, the three-dimensional structure of the main body 31 is a pyramid, such as a quadrangular pyramid. Specifically, when the three-dimensional structure of the main body 31 is a quadrangular pyramid, the main body 31 includes a first bottom surface 312 and four triangular side surfaces. The first bottom surface 312 corresponds to the light emitting surface of the light emitting device 20, and the shape of the first bottom surface 312 is a quadrilateral shape, each side of which corresponds to one side of the light emitting device 20, that is, the shape of the first bottom surface 312 is adapted to the shape of the light emitting device 20, and the size of the first bottom surface 312 depends on the size of the light emitting device 20. For example, when the surface shape of the main body 31 is a pyramid shape, the surface shape of the light emitting device 20 is a prism, and the cross-sectional shape of the light emitting device 20 is a square.

[0058] The four triangular side surfaces surround the first bottom surface 312 and are respectively connected to one side of the quadrilateral of the first bottom surface 312, and intersect at a vertex on the side away from the first bottom surface 312. The vertical distance from the vertex to the light emitting device 20 is the height of the main body 31. The vertical distance between the third intersection line 3213 on the auxiliary body 32 and the plane of the first bottom surface 312 of the main body 31 is less than or equal to the height of the main body 31, so as to avoid interference between the auxiliary body 32 and the structure above the main body 31.

[0059] Referring to Figure 4 The emitted light of the light emitting device 20 includes first light rays L1, second light rays L2, and a central light ray L0. The first light rays L1 are the boundary light rays of the emitted light, the central light ray L0 is perpendicular to the light emitting surface of the light emitting device 20, and the second light rays L2 are located between the first light rays L1 and the central light ray L0. The beam angle of the first light rays L1 is greater than the beam angle of the second light rays L2, and the first light rays L1 are the boundary light rays, that is, the beam angle of the first light rays L1 is the light emitting angle c of the light emitting device 20. The beam angle of the first light rays L1 refers to the included angle between two first light rays L1 located in the same plane, and the two first light rays L1 are symmetric about the central normal of the light emitting device 20, that is, the included angle between the two first light rays L1 symmetric about the central normal of the light emitting device 20 is the beam angle of the first light rays L1. The central light ray L0 coincides with the central normal.

[0060] The light emitting angle c of the light emitting device 20 refers to a light emitting range of the light emitting device 20, that is, a light diffusion range of the light emitting device 20, and the boundary light is a light ray at a position with the largest diffusion range in the light emitted by the light emitting device 20, and the beam angle of the boundary light represents the light emitting angle c of the light emitting device 20. In addition, the beam angles of other exit light of the light emitting device 20 mentioned in the present application can refer to the description of the beam angle of the first light ray L1, such as the beam angle of the second light ray L2 can refer to the description of the beam angle of the first light ray L1, which will not be described here.

[0061] The second light ray L2 is perpendicular to the first side surface 311 of the main body 31, and the auxiliary part 32 is located at least on the light emitting path of the exit light between the first light ray L1 and the second light ray L2, that is, the auxiliary part 32 is located at least on the light emitting path of the exit light with the beam angle between the first light ray L1 and the second light ray L2, in other words, the auxiliary part 32 at least covers the light emitting area between the first light ray L1 and the second light ray L2 on the main body 31. At least part of the exit light between the first light ray L1 and the second light ray L2 converges to the center light ray L0 after passing through the side surface of the auxiliary part 32, that is, converges to the central area of the light emitting path of the light emitting device 20, so that the large-angle exit light of the light emitting device 20 converges to the central area of the light emitting path, converges the light emitting angle of the light emitting device 20, and improves the halo problem.

[0062] And the exit light between the center light ray L0 and the second light ray L2, that is, the exit light with a beam angle smaller than the beam angle of the second light ray L2 in the exit light of the light emitting device 20, converges to the center light ray L0 after passing through the first side surface 311 of the main body 31, that is, converges to the central area of the light emitting path of the light emitting device 20, so as to improve the brightness of the light emitting device 20. Wherein, the central area of the light emitting path of the light emitting device 20 refers to the area where the central normal of the light emitting device 20 is located.

[0063] Specifically, the exit light of the light emitting device 20 further includes third light ray L3 and fourth light ray L4. The third light ray L3 is exit light with a beam angle smaller than the beam angle of the second light ray L2. Since the second light ray L2 is perpendicular to the first side surface 311 of the main body 31, the first exit light ray D2' after the second light ray L2 passes through the first side surface 311 of the main body 31 is still perpendicular to the first side surface 311 of the main body 31. The second exit light ray L3' after the third light ray L3 passes through the first side surface 311 of the main body 31 converges to the central normal of the light emitting device 20, so as to improve the brightness of the light emitting device 20.

[0064] The fourth light ray L4 has a beam angle greater than that of the second light ray L2 but less than that of the first light ray L1. The third emergent light ray after the first light ray L1 passes through the side surface of the auxiliary portion 32 converges toward the central normal of the light emitting device 20, and the fourth emergent light ray after the fourth light ray L4 passes through the side surface of the auxiliary portion 32 converges toward the central normal of the light emitting device 20, so that the large-angle emergent light of the light emitting device 20 converges toward the central region of the light emitting path, converges the light emitting angle of the light emitting device 20, and improves the halo problem.

[0065] With reference to Figure 4 and Figure 5 , the included angle e between the first light ray L1 and the first sub-side surface 321 portion extending toward the second sub-side surface 322 is greater than or equal to 90 degrees, so that the included angle between each emergent light located between the first light ray L1 and the second light ray L2 and the first sub-side surface 321 portion extending toward the second sub-side surface 322 is greater than 90 degrees, and further so that at least part of the emergent light located between the first light ray L1 and the second light ray L2 converges toward the central region of the light emitting path of the light emitting device 20 after passing through the side surface of the auxiliary portion 32.

[0066] Of course, in order to also make the first light ray L1 converge toward the central normal region of the light emitting device 20 after passing through the first sub-side surface 321, the included angle e between the first light ray L1 and the first sub-side surface 321 portion extending toward the second sub-side surface 322 needs to be greater than 90 degrees, so as to further converge the light emitting angle of the light emitting device 20 and improve the halo problem.

[0067] Specifically, with reference to Figure 5 , the emergent point of the first light ray L1 on the first sub-side surface 321 is a first emergent point, and the first emergent point is located on the first intersection line 3211. The emergent point of the second light ray L2 on the first side surface 311 of the main body portion 31 is a second emergent point, and the second emergent point is located on the second intersection line. At this time, the orthographic projection of the auxiliary portion 32 on the main body portion 31 coincides with the emergent region between the first light ray L1 and the second light ray L2, and the coincident region is also the region where the auxiliary portion 32 and the main body portion 31 are connected. It should be noted that the embodiments of the present application take the auxiliary portion 32 and the main body portion 31 as an example, and therefore, the auxiliary portion 32 and the main body portion 31 in the drawings of the present application are distinguished by a dashed line as the boundary line between the auxiliary portion 32 and the main body portion 31. The connection between the auxiliary portion 32 and the main body portion 31 is the position where the boundary line is located.

[0068] The first side surface 311 of the main body part 31 and the first bottom surface 312 of the main body part 31 are connected to each other, and the included angle between the first side surface 311 of the main body part 31 and the first bottom surface 312 of the main body part 31 is a first included angle a. The first side surface 311 of the main body part 31 includes a third sub-side surface 3111, and the third sub-side surface 3111 is covered by the auxiliary part 32. When the main body part 31 and the auxiliary part 32 are integrally arranged, the third sub-side surface 3111 is a virtual boundary surface of the main body part 31 and the auxiliary part 32, and the boundary line is located on the virtual boundary surface. The virtual boundary surface is coplanar with the first side surface 311 of the main body part 31.

[0069] The included angle between the first sub-side surface 321 and the third sub-side surface 3111 is a second included angle b, and the second included angle b satisfies the following relationship: Wherein, a and b are both greater than 0 degrees and less than 90 degrees, and c is less than or equal to 180 degrees. a represents the first included angle a, b represents the second included angle b, and c represents the light-emitting angle c of the light-emitting device 20. By making the second included angle b satisfy a specific relationship, the included angle between the first light ray L1 and the first sub-side surface 321 is greater than or equal to 90 degrees.

[0070] The included angle between the second sub-side surface 322 and the third sub-side surface 3111 is a third included angle d, and the third included angle d satisfies the following relationship: 70°≤d≤100°, wherein d represents the third included angle d. It should be noted that when part of the emitted light of the light-emitting device 20 is emitted to the second sub-side surface 322, due to the large incident angle, total reflection will occur on the second sub-side surface 322, so that this part of the emitted light cannot pass through the second sub-side surface 322, thereby affecting the light efficiency of the light-emitting device 20. By making the third included angle d satisfy a specific relationship, the present application makes the area of the first sub-side surface 321 on the first side surface 311 of the main body part 31 greater than the area of the second sub-side surface 322 on the first side surface 311 of the main body part 31, so as to reduce the emitted light emitted to the second sub-side surface 322, thereby reducing the influence of the second sub-side surface 322 on the light efficiency of the light-emitting device 20.

[0071] Continuing to combine with reference to Figure 4 and Figure 5The longitudinal section shape of the main body part 31 comprises a triangle, and the longitudinal section shape of the auxiliary part 32 comprises a triangle. The longitudinal section shape of the main body part 31 is a first triangle, and the longitudinal section shape of the auxiliary part 32 is a second triangle. The first triangle is an isosceles triangle, and the first triangle comprises a first side S1 and two second sides S2 of equal length connected to both ends of the first side S1. The first side S1 is located on the light emitting device 20, and the second side S2 is located on the second side S2. The first side S1 is located on the first bottom surface 312 of the main body part 31, and the second side S2 is located on the first side surface 311 of the main body part 31.

[0072] The second triangle comprises a third side S3 located on the second side S2, and a fourth side S4 and a fifth side S5 connected to both ends of the third side S3. The fourth side S4 is located on the side of the fifth side S5 close to the light emitting device 20. The third side S3 is located on the third sub-side surface 3111, the fourth side S4 is located on the first sub-side surface 321, and the fifth side S5 is located on the second sub-side surface 322. The included angle e between the first light L1 and the fourth side S4 is greater than or equal to 90 degrees. The included angle e between the first light L1 and the fourth side S4 is the included angle between the first light L1 and the part of the first sub-side surface 321 extending towards the second sub-side surface 322.

[0073] The included angle between the first side S1 and the second side S2 is a first included angle a, the included angle between the third side S3 and the fourth side S4 is a second included angle b, and the included angle between the third side S3 and the fifth side S5 is a third included angle d. The included angle between the first side S1 and the second side S2 is the included angle between the first side surface 311 of the main body part 31 and the first bottom surface 312 of the main body part 31. The included angle between the third side S3 and the fourth side S4 is the included angle between the first sub-side surface 321 and the third sub-side surface 3111. The included angle between the third side S3 and the fifth side S5 is the included angle between the second sub-side surface 322 and the third sub-side surface 3111.

[0074] The first included angle a satisfies the following relationship: Where a represents the first included angle a, a is greater than 0 degrees and less than 90 degrees, D1 represents the length of the first side S1, and H represents the height of the main body part 31. The second included angle b satisfies the following relationship: Among them, b represents the second angle b, b is greater than 0 degrees and less than 90 degrees, c represents the light-emitting angle c of the light-emitting device 20, c is less than or equal to 180 degrees; the third angle d satisfies the following relationship: 70°≤d≤100°, wherein d represents the third angle d.

[0075] The third side S3 intersects the fourth side S4 at a first intersection point P1, which is located on the first intersection line 3211. The third side S3 intersects the fifth side S5 at a second intersection point P2, which is located on the second intersection line. The fourth side S4 and the fifth side S5 intersect at a third intersection point P3, which is located on the third intersection line 3213.

[0076] The exit point of the first light ray L1 on the fourth side S4 is the first exit point, and the exit point of the first light ray L1 on the fourth side S4 is also the exit point of the first light ray L1 on the first sub-side surface 321. The exit point of the second light ray L2 on the second side S2 is the second exit point, and the exit point of the second light ray L2 on the fifth side S5 is also the exit point of the second light ray L2 on the second sub-side surface 322. The first exit point coincides with the first intersection point P1 or is located on the side of the first intersection point P1 close to the second intersection point P2, and the second exit point coincides with the second intersection point P2. The length of the third side S3 satisfies the following relationship: Wherein, D2 represents the length of the third side S3.

[0077] In one embodiment, referring to Figures 1 to 6 , Figure 6 This is a schematic diagram of a second longitudinal cross-sectional structure of the light emitting device 20 and the optical microstructure 30 provided in an embodiment of the present application. Figure 6 ,and Figure 4 The difference from the illustrated embodiment is that the first exit point of the first light ray L1 on the first sub-side surface 321 is located on the side of the first intersection line 3211 closer to the second intersection line. In other words, the first exit point of the first light ray L1 on the fourth side S4 is located on the side of the first intersection point P1 closer to the second intersection point P2. In this case, the coverage area of ​​the auxiliary portion 32 on the main portion 31 exceeds the light exit area between the first light ray L1 and the second light ray L2. For other explanations, please refer to the above embodiment and will not be repeated here.

[0078] In one embodiment, referring to Figures 1 to 7 , Figure 7 This is a schematic diagram of a third longitudinal cross-sectional structure of the light emitting device 20 and the optical microstructure 30 provided in an embodiment of the present application. Figure 7 ,and Figure 6In the example embodiment, the second sub-side surface 322 is perpendicular to the third sub-side surface 3111, i.e., the third side S3 is perpendicular to the fifth side S5, and the second triangle is a right triangle. In this way, the light emitted between the first light L1 and the second light L2 can pass through the first sub-side surface 321, but not the second sub-side surface 322, so as to avoid the second sub-side surface 322 affecting the light efficiency of the light emitting device 20. For other descriptions, please refer to the above embodiments, which will not be repeated here.

[0079] In an embodiment, referring to Figures 1 to 8 , Figure 8 A fourth longitudinal cross-sectional structure diagram of the light emitting device 20 and the optical microstructure 30 provided in the embodiments of the present application is shown. Referring to Figure 8 , and Figure 6 In the example embodiment, the second sub-side surface 322 is arranged beyond the region between the first light L1 and the second light L2, and the light emitted between the first light L1 and the second light L2 can pass through the first sub-side surface 321. The third included angle d between the second sub-side surface 322 and the third sub-side surface 3111 is greater than 90 degrees and less than 100 degrees, so as to reduce or avoid the second sub-side surface 322 affecting the light emitted by the part of the light beam angle smaller than the second light L2, and further reduce or avoid affecting the light efficiency of the light emitting device 20. For other descriptions, please refer to the above embodiments, which will not be repeated here.

[0080] In an embodiment, referring to Figures 1 to 9 , Figure 9 A fifth longitudinal cross-sectional structure diagram of the light emitting device 20 and the optical microstructure 30 provided in the embodiments of the present application is shown. Referring to Figure 9 , and Figure 7The second light L2 is different from the example embodiment, and the exit point of the second light L2 on the first side surface 311 of the main body 31 is a second exit point. The second exit point is located on the side of the second intersection line away from the first intersection line 3211, that is, the second exit point is located on the side of the second intersection point P2 away from the first intersection point P1. The first sub-side surface 321 and the second sub-side surface 322 intersect at a third intersection line 3213. The first exit light of the second light L2 after passing through the main body 31 passes through the third intersection line 3213, that is, the first exit light passes through the third intersection point P3. At this time, the part of the exit light located between the first light L1 and the second light L2 is emitted to the second sub-side surface 322. In order to reduce the influence of the second sub-side surface 322 on the light efficiency of the light emitting device 20, the included angle between the second sub-side surface 322 and the third sub-side surface 3111 needs to be greater than 90 degrees and less than 100 degrees, that is, the included angle between the third side S3 and the fifth side S5 is greater than 90 degrees and less than 100 degrees. For other descriptions, please refer to the above embodiment, which will not be repeated here.

[0081] In an embodiment, referring to Figures 1 to 10 , Figure 10 A second schematic diagram of the three-dimensional structure of the light emitting device 20 and the optical microstructure 30 provided in the embodiment of the present application is shown. Referring to Figure 10 , and Figure 3 The main body 31 is different from the example embodiment, and the surface shape of the main body 31 is conical, that is, the three-dimensional structure of the main body 31 is conical. At this time, the first bottom surface 312 of the main body 31 is circular, and the first side surface 311 of the main body 31 surrounds the first bottom surface 312 of the main body 31. Correspondingly, the surface shape of the light emitting device 20 is cylindrical, and the cross-sectional shape of the light emitting device 20 is circular. For other descriptions, please refer to the above embodiment, which will not be repeated here.

[0082] In an embodiment, referring to Figures 1 to 11 , Figure 11 A third schematic diagram of the three-dimensional structure of the light emitting device 20 and the optical microstructure 30 provided in the embodiment of the present application is shown. Referring to Figure 11 , and Figure 3What is different from the exemplary embodiment is that the surface shape of the main body 31 is an elliptical cone, that is, the three-dimensional structure of the main body 31 is an elliptical cone. At this time, the first bottom surface 312 of the main body 31 is an elliptical shape, and the first side surface 311 of the main body 31 surrounds the first bottom surface 312 of the main body 31. Correspondingly, the surface shape of the light-emitting device 20 is a prism, and the cross-sectional shape of the light-emitting device 20 is a rectangle. Of course, the adaptation of the structure of the main body 31 and the light-emitting device 20 described in this application is not limited to that illustrated in the embodiment of this application. For example, in this embodiment, the surface shape of the main body 31 can also be a pyramid; for another example, the surface shape of the light-emitting device 20 can also be an elliptical column, and the surface shape of the main body 31 is an elliptical cone. Please refer to the above embodiment for other explanations, which will not be repeated here.

[0083] The effect of improving halo by the optical microstructure 30 in the above embodiments will be verified below through specific data combined with simulation.

[0084] by Figure 4 Taking the optical microstructure 30 as an example, refer to Figures 1 to 16 , Figure 12 for Figure 4 Schematic diagram of the optical microstructure 30 converging the light emitting angle c of the light emitting device 20. Figure 12 When the light-emitting microstructure is not provided, the beam angle of the first light L1 remains unchanged and is emitted as a virtual emitted light L1″, which is collinear with the first light L1. The angle between the virtual emitted light L1″ and the first emitted light is a fourth angle, which satisfies the following relationship: Wherein, n is the refractive index of the main portion 31, which is also the refractive index of the auxiliary portion 32. When n = 1.4, a = 44°, b = 49°, and c = 140°, it can be obtained that f = 10.16°. Therefore, it can be seen that by providing the optical microstructure 30, the light-emitting angle of the light-emitting device 20 can be converged by 20°. That is, when the optical microstructure 30 is not provided, the light-emitting angle c of the light-emitting device 20 is 140 degrees; however, after the optical microstructure 30 is provided in the present application, the light-emitting angle c of the light-emitting device 20 is converged by 20 degrees, and the light-emitting angle c of the light-emitting device 20 is reduced to 120 degrees.

[0085] Reference Figures 13 to 16 , Figure 13 This is a schematic diagram of the halo definition range of the light emitting device 20 provided in an embodiment of the present application. Figure 14 Schematic diagram of the halo test effect of the light emitting device 20, Figure 15 Schematic diagram of luminous intensity partitioning of the light emitting device 20 when the optical microstructure 30 of the present application is not provided. Figure 16Fig. 1 shows a comparison of the light-emitting intensity of the light-emitting device 20 with and without the optical microstructure 30 of the present application.

[0086] Referring to Figure 13 , a plurality of light-emitting devices 20 are arranged in an array, and the positions of the numbers 1 to 255 respectively represent the positions of the light-emitting devices 20. When the 98th light-emitting device 20 is lit, the light-emitting diffusion range of the 98th light-emitting device 20 is shown by the circle; the brightness values of the light-emitting devices 20 at the points 1 to 255 are tested; the brightness values of the light-emitting devices 20 at the points are compared with the brightness value at the center of the 98th light-emitting device 20, and the range with a percentage value greater than or equal to 1% is the halo range of the light-emitting device 20.

[0087] Referring to Figure 14 and Figure 15 , the brightness of the central region of the light-emitting device 20 is greater than the light-emitting brightness of the halo range, and the light-emitting brightness gradually decreases from the central region of the light-emitting device 20 to the halo region. When the optical microstructure 30 is not arranged, the light-emitting diffusion range of the light-emitting device 20 occupies 10*10 partitions.

[0088] Referring to Figure 16 , Figure 16 , the curve Q1 represents the brightness variation of the light-emitting device 20 in different partitions when the optical microstructure 30 is not arranged, and the curve Q2 represents the brightness variation of the light-emitting device 20 in different partitions when the optical microstructure 30 is arranged. By comparing the curve Q1 and the curve Q2, it can be seen that, by arranging the optical microstructure 30 on the light-emitting path of the light-emitting device 20, the light-emitting diffusion range of the light-emitting device 20 can be reduced to 9*9 partitions, and the brightness of the central region of the light-emitting device 20 is also improved.

[0089] Based on the same inventive concept, the present application also provides a display module, referring to Figures 1 to 17 , Figure 17 is a sectional structure schematic diagram of the display module provided by the present application. The display module comprises the light-emitting substrate 100 of any one of the foregoing embodiments. Specifically, the display module comprises a display panel, which can be a liquid crystal display panel, a Mini Light Emitting Diode (Mini LED) display panel, a Micro Light Emitting Diode (Micro LED) display panel, etc. When the display panel is a Mini Light Emitting Diode display panel or a Micro Light Emitting Diode display panel, the display panel comprises the light-emitting substrate 100 for direct display. When the display panel is a liquid crystal display panel, the light-emitting substrate 100 is used as the backlight of the display panel.

[0090] Exemplarily, referring to Figure 17 The display module 1000 includes a display panel 300 and a backlight module 200 arranged oppositely, the display panel 300 is a liquid crystal display panel, for example, the display panel 300 can include a light-emitting substrate and a color film substrate arranged oppositely, and liquid crystal molecules arranged between the light-emitting substrate and the color film substrate, the light-emitting substrate 100 is arranged in the backlight module 200 as a backlight source of the display panel 300.

[0091] According to the above embodiments, it can be known that:

[0092] The application provides a light-emitting substrate and a display module, the light-emitting substrate includes a light-emitting device arranged on a driving backboard and an optical microstructure arranged on a light-emitting path of the light-emitting device, the optical microstructure includes a main body part and an auxiliary part protruding from the main body part, the auxiliary part is located at least on a light-emitting path of emergent light between a first light ray and a second light ray of the light-emitting device, the first light ray is a boundary light ray, the second light ray is perpendicular to a side surface of the main body part, at least part of the emergent light between the first light ray and the second light ray converges to a central light ray after passing through the side surface of the auxiliary part, and the emergent light between the central light ray and the second light ray converges to the central light ray after passing through the side surface of the main body part; in this way, by arranging the optical microstructure, the large-angle emergent light of the light-emitting device can be converged to the central area of the light-emitting path, the light-emitting angle of the light-emitting device is converged, and the halo problem is improved.

[0093] In the above embodiments, the description of each embodiment has its own emphasis, and the part not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0094] The above has introduced the embodiments of the application in detail, and the principle and implementation mode of the application are described by applying specific examples; the above description of the embodiments is only used to help understanding the technical scheme and core idea of the application; the person skilled in the art should understand that: the technical scheme recorded in the above embodiments can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the application.

Claims

1. A light-emitting substrate, characterized in that: include: Driver backplane; a light-emitting device disposed on the driving backplane, wherein the light emitted by the light-emitting device includes a first ray, a second ray, and a center ray, wherein the first ray is a boundary ray of the emitted light, the center ray is perpendicular to the light-emitting surface of the light-emitting device, and the second ray is located between the first ray and the center ray; An optical microstructure is provided on the light exit path of the light emitting device, the optical microstructure comprising a main portion provided corresponding to the light emitting device and an auxiliary portion protruding from a portion of the main portion, the main portion comprising a first bottom surface provided opposite the light emitting device and a first side surface surrounding the first bottom surface, the angle between the first side surface and the first bottom surface being less than 90 degrees, the auxiliary portion being provided on the first side surface and being located at least on the light exit path of the outgoing light between the first light ray and the second light ray, and the auxiliary portion comprising a second side surface connected to the first side surface; Wherein, at least part of the outgoing light between the first light and the second light converges toward the central light after passing through the second side surface; the second light is perpendicular to the first side surface, and the outgoing light between the central light and the second light converges toward the central light after passing through the first side surface; In which, the second side surface includes a first sub-side surface and a second sub-side surface connected to each other, the first sub-side surface and the first side surface are connected at a first intersection line, the second sub-side surface and the first side surface are connected at a second intersection line, the second intersection line is located on the side of the first intersection line away from the light-emitting device, and the angle between the first light ray and the portion of the first sub-side surface extending toward the second sub-side surface is greater than or equal to 90 degrees.

2. The light-emitting substrate according to claim 1, wherein The exit point of the first light on the first sub-side surface is a first exit point, and the first exit point is located on the first intersection line, or on a side of the first intersection line close to the second intersection line.

3. The light-emitting substrate according to claim 2, wherein: The first side surface and the first bottom surface are connected to each other, an angle between the first side surface and the first bottom surface is a first angle, the first side surface includes a third sub-side surface, the third sub-side surface is covered by the auxiliary portion, an angle between the first sub-side surface and the third sub-side surface is a second angle, and the second angle satisfies the following relationship: Among them, a and b are both greater than 0 degrees and less than 90 degrees, c is less than or equal to 180 degrees, a represents the first angle, b represents the second angle, and c represents the light-emitting angle of the light-emitting device.

4. The light-emitting substrate according to claim 3, wherein An angle between the second sub-side surface and the third sub-side surface is a third angle, and the third angle satisfies the following relationship: 70°≤d≤100°, where d represents the third angle.

5. The light-emitting substrate according to claim 4, characterized in that The exit point of the second light on the first side surface is a second exit point, and the second exit point is located on the second intersection line.

6. The light-emitting substrate according to claim 5, characterized in that The second sub-side surface is perpendicular to the third sub-side surface.

7. The light-emitting substrate according to claim 4, wherein: The exit point of the second light ray on the first side surface is the second exit point, and the second exit point is located on the side of the second intersection line away from the first intersection line; the first sub-side surface and the second sub-side surface intersect at a third intersection line, and the first exit light ray after the second light ray passes through the main body passes through the third intersection line.

8. The light-emitting substrate according to claim 1, wherein An orthographic projection area of ​​the first sub-side surface on the first side surface is greater than an orthographic projection area of ​​the second sub-side surface on the first side surface.

9. The light-emitting substrate according to claim 8, wherein The first sub-side surface intersects with the second sub-side surface at a third intersection line, and a vertical distance between the third intersection line and the plane where the first bottom surface is located is less than or equal to the height of the main body.

10. The light-emitting substrate according to any one of claims 1 to 9, characterized in that: The orthographic projection of the main body on the driving backplane is located within the orthographic projection of the light emitting device on the driving backplane, and the auxiliary portion surrounds the main body; The light emitting substrate further includes a covering medium disposed on the optical microstructure, the refractive index of the main body portion is greater than the refractive index of the covering medium, and the refractive index of the auxiliary portion is greater than the refractive index of the covering medium.

11. The light-emitting substrate according to claim 10, wherein: The refractive index of the auxiliary portion is greater than or equal to the refractive index of the main portion, and the refractive index of the main portion is greater than or equal to 1.

4.

12. The light-emitting substrate according to claim 11, wherein When the refractive index of the auxiliary portion is equal to the refractive index of the main portion, the auxiliary portion and the main portion are integrally provided.

13. The light-emitting substrate according to claim 12, wherein: The material of the main body includes at least one of silicone and resin.

14. The light-emitting substrate according to claim 10, wherein The longitudinal cross-sectional shape of the main body portion includes a triangle, and the longitudinal cross-sectional shape of the auxiliary portion includes a triangle.

15. The light emitting substrate according to claim 14, wherein: The surface shape of the main body includes one of a pyramid shape, a cone shape, and an elliptical cone shape.

16. The light emitting substrate according to claim 14, wherein: The longitudinal cross-sectional shape of the main body is a first triangle, and the longitudinal cross-sectional shape of the auxiliary portion is a second triangle. The first triangle is an isosceles triangle. The first triangle includes a first side and two second sides of equal length connected to the two ends of the first side. The first side is located on the light-emitting device, and the second triangle is located on the second side. The second triangle includes a third side located on the second side and a fourth side and a fifth side connected to the two ends of the third side. The fourth side is located on the side of the fifth side close to the light-emitting device, and the angle between the first light and the fourth side is greater than or equal to 90 degrees.

17. The light-emitting substrate according to claim 16, wherein: The angle between the first side and the second side is a first angle, the angle between the third side and the fourth side is a second angle, and the angle between the third side and the fifth side is a third angle; the first angle satisfies the following relationship: Wherein, a represents the first angle, a is greater than 0 degrees and less than 90 degrees, D1 represents the length of the first side, and H represents the height of the main body; the second angle satisfies the following relationship: Among them, b represents the second angle, b is greater than 0 degrees and less than 90 degrees, c represents the light-emitting angle of the light-emitting device, c is less than or equal to 180 degrees; the third angle satisfies the following relationship: 70°≤d≤100°, wherein d represents the third angle.

18. The light-emitting substrate according to claim 17, wherein: The exit point of the first light ray on the fourth side is the first exit point, the exit point of the second light ray on the second side is the second exit point, the third side and the fourth side intersect at a first intersection, the third side and the fifth side intersect at a second intersection, the first exit point coincides with the first intersection or is located on a side of the first intersection close to the second intersection, and the second exit point coincides with the second intersection; the length of the third side satisfies the following relationship: Wherein, D2 represents the length of the third side.

19. A display module, characterized in that: The light-emitting substrate comprises the light-emitting substrate according to any one of claims 1 to 18.

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