Light-emitting substrate and display module

Abstract

According to the light-emitting substrate and the 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, and the optical microstructure comprises a main body part and an auxiliary part protruding out of the main body part; the auxiliary part is at least located on a light emitting path of emergent light between first light and second light of the light emitting device, the first light is boundary light, the second light is perpendicular to the side face of the main body part, and at least part of the emergent light located between the first light and the second light is converged to the central light after passing through the side face of the auxiliary part. The emergent light between the central light and the second light is converged to the central light after passing through the side surface of the main body part, so that 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 field of display technology, and in particular to a light-emitting substrate and a display module. Background Art

[0002] Light Emitting Diode (LED) is a light-emitting device widely used in the display field. With the development of display technology, the size of LED chips has gradually become smaller, and small-sized LED chips such as Mini Light Emitting Diode (Mini LED) and Micro Light Emitting Diode (Micro LED) have appeared. For example, Mini LED has been widely used in the display field because of its high brightness, high contrast, high color saturation, low power consumption, fast response speed, and long life. For example, the Mini LED array can be arranged to form a light-emitting substrate, which can be used as a backlight source for a liquid crystal display (LCD), or the light-emitting substrate can be directly used as a display panel for displaying images. However, Mini LED has a halo when displaying, which affects the visual effect. Summary of the invention

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

[0004] To solve the above problems, the technical solutions provided by this application are as follows:

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

[0006] Driver backplane;

[0007] A light emitting device, disposed on the driving backplane, wherein the emitted light of the light emitting device includes a first light ray, a second light ray and a center light ray, wherein the first light ray is a boundary light ray of the emitted light, the center line light ray is perpendicular to the light emitting surface of the light emitting device, and the second light ray is located between the first light ray and the center light ray;

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

[0009] Among them, at least part of the outgoing light located between the first light and the second light converges towards the central light after passing through the second side surface; the second light is perpendicular to the first side surface, and the outgoing light located between the central light and the second light converges towards the central light after passing through the first side surface.

[0010] In the light-emitting substrate provided in the embodiment of the present application, 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 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 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.

[0011] In the light-emitting substrate provided in the embodiment of the present application, the exit point of the first light on the first sub-side surface is the first exit point, and the first exit point is located on the first intersection line, or on the side of the first intersection line close to the second intersection line.

[0012] In the light-emitting substrate provided in the embodiment of the present application, the first side surface is connected to the first bottom surface, the 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, the 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.

[0013] In the light-emitting substrate provided in the embodiment of the present application, the 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.

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

[0015] In the light-emitting substrate provided in the embodiment 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 embodiment of the present application, the exit point of the second light ray on the first side 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 intersects with the second sub-side surface 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.

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

[0018] In the light-emitting substrate provided in the embodiment of the present application, 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.

[0019] In the light-emitting substrate provided in the embodiment of the present application, 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 part surrounds the main body; the light-emitting substrate also includes a covering medium arranged on the optical microstructure, the refractive index of the main body 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 embodiment of the present application, 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.

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

[0022] In the light-emitting substrate provided in the embodiment of the present application, the material of the main body includes at least one of silicone and resin.

[0023] In the light-emitting substrate provided in the embodiment of the present application, 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.

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

[0025] In the light-emitting substrate provided in the embodiment of the present application, 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 ray and the fourth side is greater than or equal to 90 degrees.

[0026] In the light-emitting substrate provided in the embodiment of the present application, 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.

[0027] In the light-emitting substrate provided in the embodiment of the present application, the exit point of the first light on the fourth side is the first exit point, the exit point of the second light on the second side is the second exit point, the third side and the fourth side intersect at the first intersection, the third side and the fifth side are compared with the second intersection, the first exit point coincides with the first intersection or is located on the 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.

[0028] An embodiment of the present application further provides a display module, which includes the light-emitting substrate described in one of the aforementioned embodiments.

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

[0030] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0032] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the M-M' direction.

[0033] Figure 3 for Figure 2 Schematic diagram of the first three-dimensional structure of the light-emitting device and optical microstructure.

[0034] Figure 4 for Figure 3 Schematic diagram of the first longitudinal cross-sectional structure of the light-emitting device and optical microstructure.

[0035] Figure 5 for Figure 4 Enlarged schematic diagram of point N in the middle.

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

[0037] Figure 7 A third longitudinal cross-sectional structural schematic diagram of the light-emitting device and optical microstructure provided in an embodiment of the present application.

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

[0039] Fig. 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] Fig.10 A second three-dimensional structural schematic diagram of the light-emitting device and optical microstructure provided in an embodiment of the present application.

[0041] Fig.11 A third three-dimensional structural schematic diagram of the light-emitting device and optical microstructure provided in an embodiment of the present application.

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

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

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

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

[0046] Fig.16 It is a schematic diagram for comparing 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] Fig.17 A schematic diagram of a cross-sectional structure of a display module provided in 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 the present 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 regions is exaggerated for clear 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, Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the M-M' direction, Figure 3 for Figure 2 Schematic diagram of the first three-dimensional structure of the light-emitting device and optical microstructure, Figure 4 for Figure 3 Schematic diagram of the first longitudinal section structure of the light emitting device and the optical microstructure, Figure 5 for Figure 4 The enlarged schematic diagram of N in the figure. Figure 1 The light-emitting substrate 100 includes a driving backplane 10 and a light-emitting device 20 disposed on the driving backplane 10. A driving circuit is disposed on the driving substrate, and the driving circuit is used to drive the light-emitting device 20 to emit light.

[0050] Optionally, a plurality of the light emitting devices 20 are arrayed on the driving backplane 10 and bound to the driving backplane 10. The driving backplane 10 may be silicon-based, PCB-based, glass-based, etc., and the driving circuit on the driving backplane 10 may be driven by active driving or passive driving to drive the light emitting devices 20 to emit light. The light emitting devices 20 include small-sized LED chips such as Mini Light Emitting Diode (Mini LED) and Micro Light Emitting Diode (Micro LED).

[0051] Reference 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, for example, the optical microstructure 30 directly covers the light-emitting surface of the light-emitting device 20. Each of the optical microstructures 30 corresponds to one of the light-emitting devices 20. The optical microstructure 30 includes a main body 31 disposed corresponding to the light-emitting device 20 and an auxiliary part 32 protruding from a part of the main body 31.

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

[0053] Reference Figure 3The auxiliary part 32 protrudes from the first side surface 311 of the main part 31, and the auxiliary part 32 surrounds the main part 31, for example, the auxiliary part 32 surrounds the main part 31, and the surface shape of the auxiliary part 32 is annular. The auxiliary part 32 includes 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 to intersect with the first side surface 311 of the main part 31. The second side surface of the auxiliary part 32 includes a first sub-side surface 321 and a second sub-side surface 322 connected to each other, the first sub-side surface 321 and the first side surface 311 of the main part 31 are connected to a first intersection line 3211, and the second sub-side surface 322 and the first side surface 311 of the main part 31 are connected to a second intersection line, and the second intersection line is located on the side of the first intersection line 3211 away from the light emitting device 20. The first sub-side surface 321 and the second sub-side surface 322 intersect at a third intersection line 3213.

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

[0055] The material of the main body 31 includes at least one of high refractive index transparent materials such as silicone and resin. Taking silicone as an example, the auxiliary part 32 and the main body 31 can be integrated in the following way: apply silicone glue on the light-emitting surface of the light-emitting device 20; use a designed mold to press the silicone glue into a film and shape it; after the silicone glue is cured and formed, demolding can obtain the integrated optical microstructure 30, so that the auxiliary part 32 and the main body 31 are integrated.

[0056] Of course, in some other embodiments, the auxiliary portion 32 may also be provided separately from the main portion 31 , for example, the auxiliary portion 32 may be provided in close contact with the main portion 31 .

[0057] Reference Figure 3 and Figure 4, the surface shape of the main body 31 is conical, such as a pyramid, 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, the shape of the first bottom surface 312 is a quadrilateral, each side of the quadrilateral 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, 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] 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 compared with 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 part 32 and the plane where the first bottom surface 312 of the main body 31 is located is less than or equal to the height of the main body 31, so as to avoid interference between the auxiliary part 32 and the structure above the main body 31.

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

[0060] The light-emitting angle c of the light-emitting device 20 refers to the light-emitting range of the light-emitting device 20, that is, the light diffusion range of the light-emitting device 20, and the boundary light is the light at the 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 emitted lights of the light-emitting device 20 mentioned in the present application can refer to the description of the beam angle of the first light L1, for example, the beam angle of the second light L2 can refer to the description of the beam angle of the first light L1, which will not be repeated here.

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

[0062] The outgoing light between the central light L0 and the second light L2, that is, the outgoing light of the light emitting device 20 whose beam angle is smaller than the beam angle of the second light L2, converges toward the central light L0 after passing through the first side surface 311 of the main body 31, that is, converges toward 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. 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 emitted light of the light emitting device 20 also includes a third light ray L3 and a fourth light ray L4. The beam angle of the third light ray L3 is 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 emitted 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 emitted light ray L3' after the third light ray L3 passes through the first side surface 311 of the main body 31 converges toward the center normal of the light emitting device 20 to improve the brightness of the light emitting device 20.

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

[0065] Reference Figure 4 and Figure 5 , an angle e between the first light ray L1 and the portion of the first sub-side surface 321 extending toward the second sub-side surface 322 is greater than or equal to 90 degrees, so that the angles between each emergent light between the first light ray L1 and the second light ray L2 and the portion of the first sub-side surface 321 extending toward the second sub-side surface 322 are all greater than 90 degrees, thereby making at least part of the emergent light between the first light ray L1 and the second light ray L2 converge to the central area 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 make the first light ray L1 converge to the central normal area of ​​the light-emitting device 20 after passing through the first sub-side surface 321, the angle e between the first light ray L1 and the portion of the first sub-side surface 321 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, refer to Figure 5 , the exit point of the first light ray L1 on the first sub-side surface 321 is the first exit point, and the first exit point is located on the first intersection line 3211. The exit point of the second light ray L2 on the first side surface 311 of the main body 31 is the second exit point, and the second exit point is located on the second intersection line. At this time, the orthographic projection of the auxiliary part 32 on the main body 31 coincides with the exit area between the first light ray L1 and the second light ray L2, and the coincident area is also the area where the auxiliary part 32 and the main body 31 are connected. It should be noted that the various embodiments of the present application are illustrated by the example that the auxiliary part 32 and the main body 31 are integrally arranged. Therefore, in the drawings of the present application, a dotted line is used as the dividing line between the auxiliary part 32 and the main body 31 to distinguish the auxiliary part 32 from the main body 31. The connection between the auxiliary part 32 and the main body 31 is also the location of the dividing line.

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

[0069] The angle between the first sub-side surface 321 and the third sub-side surface 3111 is a second angle b, and the second angle b 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 angle a, b represents the second angle b, and c represents the light-emitting angle c of the light-emitting device 20. By making the second angle b satisfy a specific relationship, the angle between the first light ray L1 and the first sub-side surface 321 can be greater than or equal to 90 degrees.

[0070] The angle between the second sub-side surface 322 and the third sub-side surface 3111 is the third angle dd, and the third angle d satisfies the following relationship: 70°≤d≤100°, where d represents the third angle d. It should be noted that when part of the emitted light of the light-emitting device 20 is emitted toward the second sub-side surface 322, due to the large incident angle, total reflection will occur at the second sub-side surface 322, so that the 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. However, the present application makes the orthographic projection area of ​​the first sub-side surface 321 on the first side surface 311 of the main body 31 larger than the orthographic projection area of ​​the second sub-side surface 322 on the first side surface 311 of the main body 31 by making the third angle d satisfy a specific relationship, 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] Continue to combine references Figure 4 and Figure 5, the longitudinal cross-sectional shape of the main body 31 includes a triangle, and the longitudinal cross-sectional shape of the auxiliary part 32 includes a triangle. The longitudinal cross-sectional shape of the main body 31 is a first triangle, and the longitudinal cross-sectional shape of the auxiliary part 32 is a second triangle. The first triangle is an isosceles triangle. The first triangle includes 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 triangle is located on the second side S2. The first side S1 is located on the first bottom surface 312 of the main body 31, and the second side S2 is located on the first side surface 311 of the main body 31.

[0072] The second triangle includes a third side S3 located on the second side S2, a fourth side S4 and a fifth side S5 connected to both ends of the third side S3, wherein the fourth side S4 is located on a 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 angle e between the first light ray L1 and the fourth side S4 is greater than or equal to 90 degrees, and the angle e between the first light ray L1 and the fourth side S4 is also the angle between the first light ray L1 and the portion of the first sub-side surface 321 extending toward the second sub-side surface 322.

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

[0074] The first angle a satisfies the following relationship: Wherein, a represents the first angle a, a is greater than 0 degrees and less than 90 degrees, D1 represents the length of the first side S1, H represents the height of the main body 31; the second 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 with the fourth side S4 at a first intersection point P1, and the first intersection point P1 is located on the first intersection line 3211. Compared with the second intersection point P2, the third side S3 and the fifth side S5 are located on the second intersection line. The fourth side S4 and the fifth side S5 intersect at a third intersection point P3, and the third intersection point P3 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 the embodiment of the present application. Figure 6 ,and Figure 4 The difference between the exemplary embodiments is that the first emission 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 close to the second intersection line, that is, the first emission point of the first light ray L1 on the fourth side S4 is located on the side of the first intersection point P1 close to the second intersection point P2. At this time, the coverage area of ​​the auxiliary portion 32 on the main body portion 31 exceeds the light emission area between the first light ray L1 and the second light ray L2. Please refer to the above embodiments for other descriptions, which 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 the embodiment of the present application. Figure 7 ,and Figure 6The difference between the exemplary embodiment is that the second sub-side surface 322 is perpendicular to the third sub-side surface 3111, that is, the third side S3 is perpendicular to the fifth side S5, and the second triangle is a right triangle. In this way, the emitted light between the first light L1 and the second light L2 can pass through the first sub-side surface 321 instead of the second sub-side surface 322, so as to avoid the second sub-side surface 322 affecting the light effect of the light emitting device 20. For other descriptions, please refer to the above embodiment, which will not be repeated here.

[0079] In one embodiment, referring to Figures 1 to 8 , Figure 8 This is a fourth longitudinal cross-sectional structural diagram of the light emitting device 20 and the optical microstructure 30 provided in the embodiment of the present application. Figure 8 ,and Figure 6 The difference between the exemplary embodiments is that the setting area of ​​the second sub-side surface 322 exceeds the area between the first light L1 and the second light L2, and the light emitted between the first light L1 and the second light L2 passes through the first sub-side surface 321. The third 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 emission of part of the light emitted whose beam angle is less than the second light L2, thereby reducing or avoiding the influence on the light efficiency of the light emitting device 20. Please refer to the above embodiments for other descriptions, which will not be repeated here.

[0080] In one embodiment, referring to Figures 1 to 9 , Fig. 9 This is a fifth longitudinal cross-sectional structural diagram of the light emitting device 20 and the optical microstructure 30 provided in the embodiment of the present application. Fig. 9 ,and Figure 7The difference between the exemplary embodiments is that the exit point of the second light L2 on the first side surface 311 of the main body 31 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 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 the third intersection line 3213, and 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, part of the exit light between the first light L1 and the second light L2 is emitted toward the second sub-side surface 322. In order to reduce the influence of the second sub-side surface 322 on the light effect of the light emitting device 20, the 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 angle between the third side S3 and the fifth side S5 is greater than 90 degrees and less than 100 degrees. For other explanations, please refer to the above embodiments, which will not be repeated here.

[0081] In one embodiment, referring to Figures 1 to 10 , Fig.10 This is a schematic diagram of a second three-dimensional structure of the light emitting device 20 and the optical microstructure 30 provided in the embodiment of the present application. Fig.10 ,and Figure 3 The difference between the exemplary embodiments is that the surface shape of the main body 31 is conical, that is, the three-dimensional structure of the main body 31 is a cone. 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 embodiments, which will not be repeated here.

[0082] In one embodiment, referring to Figures 1 to 11 , Fig.11 This is a schematic diagram of a third three-dimensional structure of the light emitting device 20 and the optical microstructure 30 provided in the embodiment of the present application. Fig.11 ,and Figure 3The difference 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 ellipse, 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 the present application is not limited to that illustrated in the embodiment of the present 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 instructions, 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 , Fig.12 for Figure 4 Schematic diagram of the optical microstructure 30 converging the light emitting angle c of the light emitting device 20. Fig.12 , when the first light L1 is not provided with the light-emitting microstructure, the beam angle of the first light L1 remains unchanged, and the virtual emitted light L1" is emitted, and the virtual emitted light L1" is collinear with the first light L1. The angle between the virtual emitted light L1" and the first emitted light is the fourth angle, and the fourth angle satisfies the following relationship: Wherein, n is the refractive index of the main body 31, that is, the refractive index of the auxiliary part 32. When n=1.4, a=44°, b=49°, c=140°, it can be obtained that f=10.16°. It can be seen that by setting 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 set, the light-emitting angle c of the light-emitting device 20 is 140 degrees; and after the optical microstructure 30 is set 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 , Fig.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. Fig.14 is a schematic diagram of the halo test effect of the light emitting device 20, Fig.15 is a schematic diagram of luminous intensity partitioning of the light emitting device 20 when the optical microstructure 30 of the present application is not provided, Fig.16It is a schematic diagram for comparing luminous intensity zones of a light-emitting device 20 when the optical microstructure 30 of the present application is provided and when the optical microstructure 30 of the present application is not provided.

[0086] Reference Fig.13 , multiple light emitting devices 20 are arranged in an array, and the positions of numbers 1 to 255 represent the positions of a light emitting device 20. When the 98th light emitting device 20 is lit, the light diffusion range of the 98th light emitting device 20 is shown as a circle; the brightness values ​​of the light emitting devices 20 at each point from 1 to 255 are tested; the percentage of the brightness value of the light emitting device 20 at each point and the brightness value of the center point of the 98th light emitting device 20 is compared, and the range of percentage value ≥1% is the halo range of the light emitting device 20.

[0087] Reference Fig.14 and Fig.15 , the brightness of the central area of ​​the light emitting device 20 is greater than the brightness of the halo range, and the brightness gradually decreases from the central area of ​​the light emitting device 20 to the brightness of the halo area. When the optical microstructure 30 is not provided, the light diffusion range of the light emitting device 20 occupies 10*10 partitions.

[0088] Reference Fig.16 , Fig.16 The middle curve Q1 represents the brightness change of the light emitting device 20 in different partitions when the optical microstructure 30 is not provided, and the curve Q2 represents the brightness change of the light emitting device 20 in different partitions when the optical microstructure 30 is provided. By comparing the curve Q1 and the curve Q2, it can be seen that the present application can reduce the light diffusion range of the light emitting device 20 to 9*9 partitions by providing the optical microstructure 30 on the light emitting path of the light emitting device 20, and the brightness of the central area of ​​the light emitting device 20 is also improved.

[0089] Based on the same inventive concept, the present application embodiment also provides a display module, referring to Figures 1 to 17 , Fig.17 A schematic diagram of a cross-sectional structure of a display module provided in an embodiment of the present application. The display module includes a light-emitting substrate 100 of one of the aforementioned embodiments. Specifically, the display module includes a display panel, and the display panel may be a liquid crystal display panel, a mini light emitting diode (Mini Light Emitting Diode, Mini LED) display panel, and a micro light emitting diode (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 includes 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] For example, refer to Fig.17 The display module 1000 includes a display panel 300 and a backlight module 200 that are relatively arranged. The display panel 300 is a liquid crystal display panel. For example, the display panel 300 may include a light-emitting substrate and a color film substrate that are relatively arranged, 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 to serve as a backlight source of the display panel 300.

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

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

[0093] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0094] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A light-emitting substrate, characterized in that: include: Driver backplane; A light emitting device, disposed on the driving backplane, wherein the emitted light of the light emitting device includes a first light ray, a second light ray and a center light ray, wherein the first light ray is a boundary light ray of the emitted light, the center line light ray is perpendicular to the light emitting surface of the light emitting device, and the second light ray is located between the first light ray and the center light ray; An optical microstructure is arranged on the light exit path of the light emitting device, the optical microstructure comprises a main body arranged corresponding to the light emitting device and an auxiliary part protruding from a part of the main body, the main body comprises a first bottom surface arranged opposite to 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 is less than 90 degrees, the auxiliary part is arranged on the first side surface, and the auxiliary part is at least located on the light exit path of the exit light between the first light and the second light, and the auxiliary part comprises a second side surface connected to the first side surface; Among them, at least part of the outgoing light located between the first light and the second light converges towards the central light after passing through the second side surface; the second light is perpendicular to the first side surface, and the outgoing light located between the central light and the second light converges towards the central light after passing through the first side surface.

2. The light-emitting substrate according to claim 1, characterized in that: 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 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 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.

3. The light-emitting substrate according to claim 2, characterized in that: The exit point of the first light ray 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.

4. The light-emitting substrate according to claim 3, characterized in that: The first side surface is connected to the first bottom surface, 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.

5. The light-emitting substrate according to claim 4, characterized in that: 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.

6. The light-emitting substrate according to claim 5, 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.

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

8. The light-emitting substrate according to claim 5, characterized in that: 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.

9. The light-emitting substrate according to claim 2, characterized in that: 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.

10. The light emitting substrate according to claim 9, characterized in that: 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 a plane where the first bottom surface is located is less than or equal to a height of the main body.

11. The light-emitting substrate according to any one of claims 1 to 10, 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 part 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.

12. The light emitting substrate according to claim 11, characterized in that: 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.

13. The light emitting substrate according to claim 12, characterized in that: 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.

14. The light emitting substrate according to claim 13, characterized in that: The material of the main body includes at least one of silicone and resin.

15. The light emitting substrate according to claim 11, characterized in that: 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.

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

17. The light emitting substrate according to claim 15, characterized in that: 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 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 two 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 angle between the first light and the fourth side is greater than or equal to 90 degrees.

18. The light emitting substrate according to claim 17, characterized in that: 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.

19. The light emitting substrate according to claim 18, characterized in that: 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 intersects with the fourth side at the first intersection point, and compared with the second intersection point, the first exit point of the third side and the fifth side coincides with the first intersection point or is located on the side of the first intersection point close to the second intersection point, and the second exit point coincides with the second intersection point; the length of the third side satisfies the following relationship: Wherein, D2 represents the length of the third side.

20. A display module, characterized in that: The light emitting substrate comprises the light emitting substrate as claimed in any one of claims 1 to 19.

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