Light-emitting module and display device

Abstract

The invention provides a light-emitting module and a display device. The light-emitting module comprises a dodging structural plate, the dodging structural plate comprises a first surface and a second surface which are oppositely arranged, a plurality of first grooves are formed in the first surface, and the cross section areas of the first grooves are gradually reduced in the depth direction of the first grooves; the light-emitting devices are arranged on the first surface, the light-emitting devices correspond to the first grooves in a one-to-one mode, each light-emitting device comprises a light-emitting area, the orthographic projection of each light-emitting area on the first surface is located in the orthographic projection of each first groove on the first surface, and light generated by the light-emitting areas of the light-emitting devices enters the dodging structural plate through the first grooves. The light is emitted from one side of the second surface of the dodging structural plate; the first surface is at least provided with a microstructure in an area between the adjacent first grooves; and the second surface is at least provided with a light condensation structure in an area between the adjacent first grooves. The light-emitting module disclosed by the invention has a relatively good dodging effect and is beneficial to reducing the thickness of the display device.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a light-emitting module and a display device. Background Art

[0002] The liquid crystal display device includes a backlight module and a liquid crystal display panel. In the prior art, the backlight source in the direct-type backlight module can adopt a light-emitting substrate, on which a plurality of inorganic light-emitting diodes are arranged. Such a backlight has the advantage of high dynamic range display, but since the plurality of inorganic light-emitting diode arrays are spaced apart, lamp shadows are inevitably present after they are lit. In order to eliminate the lamp shadows and improve the uniform light effect, at least one uniform light film layer is required to be provided on the light-emitting side of the light-emitting substrate, and a sufficient light mixing distance (i.e., OD value) is required to be provided between the uniform light film layer closest to the light-emitting substrate and the light-emitting substrate. This results in a relatively thick backlight module, and it is difficult to reduce the thickness of the backlight module, which is not conducive to the thin and light design of the display device.

[0003] In addition, in addition to the light-homogenizing film layer, other optical films are also provided in the backlight module. Although the light-homogenizing effect is improved, the film layer will cause the light output brightness of the inorganic light-emitting diode to continuously decrease due to the increase in the number of optical films. In order to increase the brightness of the display device, it is necessary to reduce the number of optical films in the backlight module. Summary of the invention

[0004] The embodiments of the present disclosure provide a light-emitting module and a display device to solve or alleviate one or more technical problems in the prior art.

[0005] As a first aspect of an embodiment of the present disclosure, an embodiment of the present disclosure provides a light-emitting module, including:

[0006] The light homogenizing structure plate comprises a first surface and a second surface arranged opposite to each other, the first surface is provided with a plurality of first grooves, and the cross-sectional area of ​​the first grooves gradually decreases along the depth direction of the first grooves;

[0007] A light emitting device is arranged on the first surface, the light emitting device corresponds to the first groove one by one, the light emitting device includes a light emitting area, the orthographic projection of the light emitting area on the first surface is located within the orthographic projection of the first groove on the first surface, and the light generated by the light emitting area of ​​the light emitting device enters the light homogenizing structure plate through the first groove and is emitted from the second surface side of the light homogenizing structure plate;

[0008] The first surface is provided with a microstructure at least in a region between adjacent first grooves; and the second surface is provided with a light-focusing structure at least in a region between adjacent first grooves.

[0009] In some embodiments, the light-homogenizing structure plate includes a light-emitting area, the orthographic projection of the first groove on the first surface is located in the light-emitting area, the light-emitting device is located in the light-emitting area, the microstructure is located in the light-emitting area and in an area outside the first groove, and the focusing structure is located in the light-emitting area and in an area outside the orthographic projection of the first groove on the second surface.

[0010] In some embodiments, the transverse cross-sectional area of ​​the focusing structure gradually decreases in the direction from the first surface to the second surface, and the longitudinal cross-section of the focusing structure is a triangle, trapezoid, parabola, ellipse or arc shape.

[0011] In some embodiments, the microstructure is a first micro-pit; or, the microstructure is a micro-protrusion.

[0012] In some embodiments, the microstructure is a first micro-pit, and a longitudinal cross-section of the first micro-pit is a parabola shape, an ellipse shape, or a circular arc shape.

[0013] In some embodiments,

[0014] The longitudinal cross-section of the first micro-pit is semicircular, and the radius of the semicircle is 0.03 mm to 0.05 mm; and / or,

[0015] The distance between the centers of two adjacent first micro-pits is 0.07 mm to 0.11 mm.

[0016] In some embodiments, the second surface is further provided with a second micro-dimple, and the second micro-dimple is located within the orthographic projection of the first groove on the second surface;

[0017] The cross-sectional area of ​​the second micro-pit gradually decreases along the depth direction of the second micro-pit, and the second micro-pit is a conical pit.

[0018] In some embodiments,

[0019] The bottom surface of the second micro-pit is a plane, and the bottom surface size of the second micro-pit is 0.04 mm to 0.06 mm; and / or,

[0020] The distance between the centers of two adjacent second micro-pits is 0.05 mm to 0.07 mm; and / or,

[0021] The cone angle of the second micro pit is 45° to 65°.

[0022] In some embodiments, the bottom surface of the first groove is a conical surface convex toward the first surface, and a first reflective layer is disposed on the bottom surface of the first groove.

[0023] In some embodiments, the cone angle of the conical surface is 150° to 170°.

[0024] In some embodiments, the light transmittance of the first reflective layer is 45% to 60%.

[0025] In some embodiments, a color conversion material is also included. The color conversion material is located in the first groove, and the color conversion material is used to modulate the first color light generated by the light emitting device into a second color light.

[0026] In some embodiments,

[0027] The light-emitting module further includes a second reflective layer, and the second reflective layer is located on a surface of the light-homogenizing structure plate on one side facing the light-emitting device; and / or,

[0028] The light-emitting module also includes a transparent encapsulation layer, which is located on a side of the light-emitting device away from the light-homogenizing structure plate, and the orthographic projection of the light-emitting device on the first surface is located within the orthographic projection of the transparent encapsulation layer on the first surface.

[0029] In some embodiments, a metal trace is disposed on the first surface of the light uniforming structure plate, and the light emitting device is coupled to the metal trace.

[0030] As a second aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a display device, comprising the light-emitting module in any embodiment of the present disclosure.

[0031] As a third aspect of the embodiments of the present disclosure, the embodiments of the present disclosure provide a display device, including the light-emitting module in any embodiment of the present disclosure, and also including a display panel, which is located on the side of the light-homogenizing structure plate away from the light-emitting device.

[0032] The technical solution disclosed in the present invention arranges the light-emitting device on the first surface of the light-evening structure plate, and the light-evening structure plate can be used as the substrate of the light-emitting device; by arranging the first groove and the microstructure on the first surface of the light-evening structure plate, and arranging the focusing structure on the second surface of the light-evening structure plate, the light-evening effect of the light-emitting module is improved, so that it is no longer necessary to arrange the diffusion plate, the light-evening film and other film layers in the light-emitting module, and it is no longer necessary to set the OD value, which greatly reduces the number of film layers and the thickness of the light-emitting module, thereby reducing the thickness of the display device and realizing the light and thin design of the product.

[0033] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present disclosure will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure and should not be regarded as limiting the scope of the present disclosure.

[0035] Figure 1 It is a structural schematic diagram of a light-emitting module in one embodiment of the present disclosure;

[0036] Figure 2 It is a structural schematic diagram of a light-emitting module in another embodiment of the present disclosure;

[0037] Figure 3 is a schematic plan view of a first surface of a light-homogenizing structural plate in one embodiment;

[0038] Figure 4 is a schematic plan view of the second surface of the light homogenizing structure plate in one embodiment;

[0039] Figure 5A for Figure 1 Part C is an enlarged schematic diagram of an embodiment;

[0040] Figure 5B for Figure 1 Part C is an enlarged schematic diagram of another embodiment;

[0041] Figure 6 for Figure 2 The enlarged schematic diagram of the D part;

[0042] Figure 7 for Figure 1 The enlarged schematic diagram of part E in the middle;

[0043] Figure 8 for Figure 1 A schematic diagram of an enlarged portion F in one embodiment;

[0044] Fig. 9 for Figure 1 Part F is an enlarged schematic diagram of another embodiment;

[0045] Fig.10 It is a structural schematic diagram of a backlight module;

[0046] Fig.11 It is a structural schematic diagram of a backlight module;

[0047] Fig.12 It is a structural schematic diagram of a backlight module;

[0048] Fig.13 for Fig.10 A simulation diagram of the light output brightness of the backlight module is shown;

[0049] Fig.14 for Fig.11 A simulation diagram of the light output brightness of the backlight module is shown;

[0050] Fig.15 for Fig.12 A simulation diagram of the light output brightness of the backlight module is shown;

[0051] Fig.16 for Figure 1 A simulation diagram of the light output brightness of the backlight module is shown;

[0052] Fig.17 for Figure 2 A schematic plan view of the position of the first light reflecting layer in FIG.

[0053] Fig.18 It is a structural schematic diagram of a backlight module;

[0054] Fig.19A for Fig.18 The Y chromaticity distribution diagram of the light output brightness of the backlight module shown;

[0055] Fig.19B for Fig.18 The X-chromaticity distribution diagram of the light output brightness of the backlight module shown;

[0056] Fig. 20 for Fig.18 The brightness distribution diagram of the light output brightness of the backlight module shown;

[0057] Fig.21A for Figure 2 The Y chromaticity distribution diagram of the light output brightness of the backlight module shown;

[0058] Fig. 21B for Figure 2 The X-chromaticity distribution diagram of the light output brightness of the backlight module shown;

[0059] Fig. 22 for Figure 2 The brightness distribution diagram of the light output brightness of the backlight module shown;

[0060] Fig.23 It is a schematic diagram of the relationship between the ratio of the size of the light-emitting device to the projection diameter of the first reflective layer on the first surface and the light output brightness.

[0061] Description of reference numerals:

[0062] 20. Light-emitting device; 21. Light-emitting area; 30. Light-uniform structure plate; 311. First groove; 312. Microstructure / first micro-pit; 321. Second micro-pit; 322. Light-focusing structure; 41. First reflection layer; 42. Second reflection layer; 50. Color modulation layer; 60. Transparent encapsulation layer. DETAILED DESCRIPTION

[0063] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure, and different embodiments may be combined arbitrarily without conflict. Therefore, the drawings and descriptions are considered to be illustrative in nature and not restrictive.

[0064] The inorganic light emitting diode (LED) chip in the present disclosure may be a sub-millimeter light emitting diode (Mini Light Emitting Diode, referred to as Mini LED) chip, or may be a micro light emitting diode (Micro Light Emitting Diode, referred to as Micro LED) chip.

[0065] In this article, a groove, pit or protrusion has a central axis extending along its depth or height direction, and the cross-section of the groove, pit or protrusion is a cross-section in a direction perpendicular to its central axis; the longitudinal section of the groove, pit or protrusion is a cross-section in a direction parallel to its central axis.

[0066] Figure 1 is a schematic structural diagram of a light-emitting module in an embodiment of the present disclosure, Figure 1 Schematic diagram of the path of some light rays is shown in FIG. Figure 2 FIG. 1 is a schematic diagram of the structure of a light-emitting module in another embodiment of the present disclosure. Figure 1 and Figure 2 As shown, the light emitting module may include a light-homogenizing structure plate 30 and a light emitting device 20, and the light-homogenizing structure plate 30 includes a first surface and a second surface that are arranged opposite to each other. Figure 1 and Figure 2 In the embodiment, the first surface is the lower surface of the light homogenizing structure plate 30, and the second surface is the upper surface of the light homogenizing structure plate 30. The first surface is provided with a plurality of first grooves 311, and the cross-sectional area of ​​the first grooves 311 gradually decreases along the depth direction of the first grooves 311. Figure 1 and Figure 2 In the figure, the cross section of the first groove 311 is the cross section of the first groove 311 in the horizontal direction.

[0067] The light-emitting device 20 can be arranged on the first surface, and the light-emitting device 20 corresponds to the first groove 311 one by one. The light-emitting device 20 includes a light-emitting area 21, and the orthographic projection of the light-emitting area 21 on the first surface is located within the orthographic projection of the first groove 311 on the first surface. The light generated by the light-emitting area 21 of the light-emitting device 20 enters the light-uniform structure plate 30 through the first groove 311, and is emitted from the second surface of the light-uniform structure plate 30, so the light-emitting side of the light-emitting module is located on the side of the light-uniform structure plate 30 that is away from the light-emitting device 20. Exemplarily, the light-emitting device 20 may include an inorganic light-emitting diode, and the inorganic light-emitting diode includes a light-emitting area 21 and a welding area located outside the light-emitting area 21, and the light-emitting area 21 can emit light, and the welding area does not emit light. It can be understood that, Figure 1 and Figure 2 The light emitting device 20 is fixed on the light homogenizing structure plate 30, but Figure 1 and Figure 2 The light emitting area of ​​the light emitting device 10 is only shown by way of example, and the specific connection position of the light emitting device 20 and the light homogenizing structure plate 30 is not shown. The specific position and size of the light emitting device on the first surface can be set as required and are not specifically limited here.

[0068] Figure 3 is a schematic plan view of a first surface of a light-homogenizing structure plate in one embodiment, Figure 4 FIG. 1 is a schematic plan view of the second surface of the light homogenizing structure plate in one embodiment. Figure 1-Figure 4 As shown, the first surface is provided with microstructures 312 at least in the area between adjacent first grooves 311. The microstructures 312 can reflect at least part of the light irradiated onto the microstructures 312 from the light homogenizing structure plate 30 back into the light homogenizing structure plate 30.

[0069] The second surface is provided with a light-concentrating structure 322 at least in the area between the adjacent first grooves 311. The light-concentrating structure 322 can extract the light irradiated onto the light-concentrating structure 322 from the light-uniform structure plate 30, thereby improving the brightness of the area between the adjacent first grooves 311, which is beneficial to improving the light-uniform effect of the light-uniform structure plate 30.

[0070] Figure 3 and Figure 4There are 2 rows and 2 columns of light-emitting devices respectively arranged in the figure, and correspondingly, there are 2 rows and 2 columns of first grooves 311 arranged. The area A between adjacent first grooves 311 should be understood to include: the area between adjacent first grooves 311 in the first direction, such as the area between the first groove 311a and the first groove 311b; the area between adjacent first grooves 311 in the second direction, such as the area between the first groove 311a and the first groove 311c; the area between adjacent first grooves 311 in other straight line directions, such as the area between the first groove 311b and the first groove 311c. Among them, the first direction is the horizontal direction, and the second direction can be the vertical direction. In this embodiment, the area between adjacent first grooves 311 (that is, the area where the microstructure 312 is located) can be set as area A, and the area where the first groove 311 is located can be set as area B.

[0071] In the embodiment of the present disclosure, the cross-sectional area of ​​the first groove 311 gradually decreases along the depth direction of the first groove 311, so that the side wall of the first groove 311 is in a conical plane or curved surface. Figure 1 As shown, the orthographic projection of the light-emitting area 21 of the light-emitting device 20 on the first surface is located within the orthographic projection of the first groove 311 on the first surface, and the light emitted by the light-emitting area 21 of the light-emitting device 20 can enter the light-homogenizing structure plate 30 through the side wall of the first groove 311. In addition, the light emitted by the light-emitting area 21 of the light-emitting device 20 enters the light-homogenizing structure plate 30 along the normal direction of each point on the side wall of the first groove 311, thereby expanding the light-emitting angle of the light-emitting device 20; since the cross-sectional area of ​​the first groove 311 gradually decreases along the depth direction of the first groove 311, the light entering the light-homogenizing structure plate 30 through the side wall of the first groove 311 is divergent, and diverges to the surroundings with the first groove 311 as the center, so that the first groove 311 becomes the center of the light source. Therefore, by setting the first groove 311, the area of ​​the light-emitting area 21 corresponding to the light-emitting device 20 is expanded, and the direction of light divergence is expanded, which is conducive to improving the light-homogenizing effect of the light-homogenizing structure plate 30.

[0072] In the related art, both surfaces of the glass substrate of the light-emitting base in the backlight module are flat surfaces, and light is transmitted through total reflection in the glass substrate.

[0073] In the embodiment of the present disclosure, the first surface is provided with a microstructure 312 at least in the area between the adjacent first grooves 311. The microstructure 312 can reflect at least part of the light irradiated from the light-homogenizing structure plate 30 to the microstructure 312 back to the light-homogenizing structure plate 30, thereby preventing the light from being emitted from the position of the microstructure 312 and reducing the light loss. When the light in the light-homogenizing structure plate 30 is transmitted to the microstructure 312, the microstructure 312 reflects the light. Compared with the reflection on the plane, the microstructure 312 can change the transmission direction of the light, destroy the original total reflection, and make at least part of the reflected light toward area A, which is conducive to the light being taken out by the focusing structure 322, thereby facilitating the improvement of the light output brightness of area A on the second surface.

[0074] For example, Figure 1 When the light a1 is transmitted to the microstructure 312 in the light homogenizing structure plate 30, the microstructure 312 can reflect the light a1 so that the reflected light a2 of the light a1 is directed toward the area A, which is conducive to the light a2 being taken out by the focusing structure 322 and improving the brightness of the area A.

[0075] A focusing structure 322 is provided on the second surface at least in the area between adjacent first grooves 311 (i.e., area A). The focusing structure 322 has the effect of collecting and focusing light, so that the focusing structure 322 can take out the light irradiated onto the focusing structure 322 from the uniform light structure plate 30 and converge the light, further improving the brightness of area A, reducing the brightness difference between area A and area B, and further improving the uniform light effect of the uniform light structure plate 30.

[0076] In the light-emitting module of the embodiment of the present disclosure, the light-emitting device 20 is arranged on the first surface of the light-evening structure plate 30, and the light-evening structure plate 30 can be used as the substrate of the light-emitting device 20; by arranging the first groove 311 and the microstructure 312 on the first surface of the light-evening structure plate 30, and arranging the focusing structure 322 on the second surface of the light-evening structure plate 30, the light-evening effect of the light-emitting module is improved, so that it is no longer necessary to arrange film layers such as a diffusion plate and a light-evening film in the light-emitting module, and it is no longer necessary to set an OD value, which greatly reduces the number of film layers and the thickness of the light-emitting module, thereby reducing the thickness of the display device and realizing a light and thin design of the product.

[0077] In addition, the reduction in the number of film layers in the light-emitting module reduces the brightness loss of light in the light-emitting module, further improves the brightness of the light-emitting module, and improves the brightness of the display device.

[0078] In one embodiment, Figure 3 and Figure 4 As shown, the light uniforming structure plate 30 may include a light exiting area and may also include a frame area outside the light exiting area. Figure 3 and Figure 4The boundary line aa between the light emitting area and the frame area is shown in FIG. The inner side of the boundary line aa is the light emitting area, and the outer side of the boundary line aa is the frame area. The orthographic projection of the first groove 311 on the first surface is located in the light emitting area, and the light emitting area 21 of the light emitting device 20 is located in the light emitting area. The microstructure 312 can be located in the light emitting area and in the area outside the first groove 311. The microstructure 312 located in the light emitting area can be arranged in an array, such as Figure 3 shown.

[0079] The light-concentrating structure 322 may be located in the light-exiting region and in a region outside the orthographic projection of the first groove 311 on the second surface. The light-concentrating structure 322 located in the light-exiting region may be arranged in an array, such as Figure 4 shown. Figure 4 The focusing structure 322 shown in the figure is a quadrangular pyramid. It can be understood that the focusing structure 322 can also be a triangular pyramid, a pentagonal pyramid or other pyramids. In other embodiments, the focusing structure 322 can also be a curved surface, as long as the focusing structure 322 can achieve the effect of collecting and focusing light.

[0080] In one embodiment, Figure 3 and Figure 4 As shown, the microstructure 312 can also be located in the border area, that is, the microstructure 312 is located in the area outside the first groove 311 on the first surface. The focusing structure 322 can also be located in the border area, that is, the focusing structure 322 is located on the second surface and is located in the area outside the orthographic projection of the first groove 311 on the second surface. The microstructures 312 located in the border area can be arranged in an array. The size of the microstructures located in the border area can be the same as or different from the size of the microstructures located in the light exit area. The focusing structures located in the border area can be arranged in an array. The size of the focusing structure located in the border area can be the same as or different from the size of the focusing structure located in the light exit area.

[0081] Exemplarily, the material of the light-homogenizing structure plate 30 may include a transparent material, such as glass. A metal trace is disposed on the first surface of the light-homogenizing structure plate 30, and the light-emitting device 20 is coupled to the metal trace. In such a technical solution, the light-homogenizing structure plate 30 can also be used as a substrate of the light-emitting device 20.

[0082] In one embodiment, the thickness of the light-homogenizing structure plate 30 (i.e., the distance between the first surface and the second surface) is 0.3 mm to 0.8 mm (including the endpoint values). For example, the thickness of the light-homogenizing structure plate 30 can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or 0.8 mm. By adopting the technical solution of the embodiment of the present disclosure, the light-homogenizing structure plate of 0.3 mm to 0.8 mm can achieve the required light-homogenizing effect, greatly reducing the thickness of the light-emitting module, which is conducive to achieving ultra-thin products.

[0083] Figure 5A for Figure 1 Part C is an enlarged schematic diagram of an embodiment, Figure 5B for Figure 1 Part C is an enlarged schematic diagram of another embodiment; Figure 6 for Figure 2 In one embodiment, the cross-sectional area of ​​the light-focusing structure 322 gradually decreases in the direction from the first surface to the second surface, for example, Figure 5A-Figure 6 In the figure, the transverse cross-sectional area of ​​the focusing structure 322 gradually decreases from bottom to top. The longitudinal cross-section of the focusing structure 322 can be a triangle, a trapezoid, a parabola, an ellipse or an arc. The focusing structure 322 of this structure can have a focusing effect and improve the brightness of area A. The focusing structure 322 of this structure can not only remove the light of area A, but also has the effect of converging the light, further improving the brightness of area A.

[0084] For example, the transverse cross-sectional shape of the light-concentrating structure 322 can be a polygon such as a triangle or a quadrilateral; or the transverse cross-sectional shape of the light-concentrating structure 322 can be a curved shape such as a circle or an ellipse. The specific shape of the light-concentrating structure 322 can be set as needed, and as long as it can achieve the effect of concentrating light, it belongs to the technical solution of the embodiment of the present disclosure.

[0085] For example, Figure 5A and Figure 5B As shown, the light focusing structure 322 can be provided in the area A of the second surface by adding materials; or Figure 6 As shown, a light-concentrating structure 322 can be provided in area A of the second surface by removing material. The number of light-concentrating structures 322 can be multiple, and the multiple light-concentrating structures 322 can be arranged in an array, such as Figure 4 shown.

[0086] The bottom dimension d2 of the focusing structure 322 may be 0.03 mm to 0.05 mm (including the endpoint values). For example, the bottom dimension d2 of the focusing structure may be 0.03 mm, 0.04 mm or 0.05 mm. The bottom of the focusing structure may be a curved shape such as a circle or an ellipse, or the bottom of the focusing structure may be a polygonal shape such as a triangle or a quadrilateral. The height H2 of the focusing structure 322 may be 0.02 mm to 0.05 mm, for example, the height H2 may be 0.02 mm, 0.03 mm, 0.04 mm or 0.05 mm. The center distance between two adjacent focusing structures 322 may be set as needed.

[0087] Exemplarily, there may be a plurality of light-focusing structures 322 , and the plurality of light-focusing structures 322 may be arranged in an array. Figure 4The area where the light-concentrating structures 322 are located is shown in FIG. 3 , and the arrangement of the light-concentrating structures 322 in a part of the area is shown to be an array arrangement. The spacing between adjacent light-concentrating structures 322 can be set as required.

[0088] Figure 7 for Figure 1 In one embodiment, the microstructure 312 may be a first micro-pit 312, such as Figure 7 As shown. The microstructure 312 is set as the first micro-pit 312, so that the surface of the first micro-pit 312 facing the inside of the light-homogenizing structure plate 30 is a convex surface. When the light in the light-homogenizing structure plate 30 is irradiated on the first micro-pit 312, the convex surface of the first micro-pit 312 facing the inside of the light-homogenizing structure plate 30 is conducive to effectively reflecting the light to area A, so that more light can be taken out by the focusing structure 322 and emitted from the second surface of area A, thereby improving the brightness of area A.

[0089] The longitudinal cross-section of the first micro dimple 312 may be in the shape of a parabola, an ellipse, or a circular arc.

[0090] The longitudinal cross-section of the first micro-pit 312 may be semicircular, and the radius R of the semicircle may be 0.03 mm to 0.05 mm. For example, the semicircular radius R may be 0.03 mm, 0.04 mm or 0.05 mm. Such a first micro-pit 312 is a hemispherical cavity, so that the surface of the first micro-pit 312 facing the light homogenizing structure plate 30 can reflect part of the light irradiated thereon back into the light homogenizing structure plate 30 in a total reflection manner, thereby preventing the light from being emitted from the first surface of region A and reducing light loss.

[0091] For example, the number of the first micro-pits 312 may be multiple, and the multiple first micro-pits 312 may be arranged in an array. The distance d1 between the centers of two adjacent first micro-pits 312 may be 0.07 mm to 0.11 mm. For example, the distance d1 may be 0.07 mm, 0.09 mm, or 0.11 mm.

[0092] In one embodiment, the second surface is further provided with a second micro-pit 321, and the second micro-pit 321 is located within the orthographic projection of the first groove 311 on the second surface. Figure 4 In the orthographic projection area of ​​the first groove 311 on the second surface, the second micro dimples 321 may be arranged in an array, or the second micro dimples 321 may be arranged in a circular array. Figure 4 The top edge of the second micro-pit 321 shown in FIG. 1 is a quadrilateral. It can be understood that the top edge of the second micro-pit 321 can also be other polygonal or closed curve shapes.

[0093] Figure 8 for Figure 1 Part F is an enlarged schematic diagram of an embodiment, Fig. 9 for Figure 1 FIG. 5 is an enlarged schematic diagram of part F in another embodiment. Figure 8 and Fig. 9 As shown, the cross-sectional area of ​​the second micro-pit 321 gradually decreases along the depth direction of the second micro-pit 321. The second micro-pit 321 may be a conical pit. The longitudinal cross-section of the second micro-pit 321 may be triangular, trapezoidal or curved. The second micro-pit 321 may be a conical pit such as an inverted triangular pyramid or an inverted quadrangular pyramid; or the second micro-pit 321 may be a conical pit such as a triangular truncated pyramid or an inverted quadrangular truncated pyramid.

[0094] With the second micro-pit 321 of this structure, when the light entering the light-uniform structure plate 30 through the side wall of the first groove 311 is transmitted to the second micro-pit 321, part of the light will be reflected back to the light-uniform structure plate 30 by the side wall of the second micro-pit 321 and transmitted to area A, thereby increasing the amount of light entering area A, further improving the brightness of area A, reducing the brightness of area B, and improving the light-uniform effect of the light-uniform structure plate 30.

[0095] Experiments have shown that, compared with a plane in region B of the second surface, providing second micro-pits 321 in region B of the second surface can reduce the brightness of region B of the second surface by about 17%.

[0096] like Figure 8 As shown, the bottom surface of the second micro-pit 321 can be a plane. Therefore, the light directly incident on the bottom surface of the second micro-pit 321 can be emitted through the bottom surface of the second micro-pit 321, ensuring that light is emitted from area B and the brightness of area B is ensured.

[0097] Exemplarily, the bottom surface size d4 of the second micro dimple 321 may be 0.04 mm to 0.06 mm. For example, d4 may be 0.04 mm, 0.05 mm or 0.06 mm. The bottom surface of the second micro dimple 321 may be a quadrilateral, a circle or other shapes.

[0098] The distance d3 between the centers of two adjacent second micro dimples 321 is 0.05 mm to 0.07 mm. For example, the distance d3 between the centers of two adjacent second micro dimples 321 may be 0.05 mm, 0.06 mm or 0.07 mm.

[0099] The cone angle θ of the second micro-dimple 321 is 45° to 65°. Exemplarily, the cone angle θ of the second micro-dimple 321 is 50° to 60°. For example, the angle θ is 50°, 55° or 60°. The cone angle of the second micro-dimple 321 can be understood as the angle between the two sides in the longitudinal section of the second micro-dimple 321.

[0100] In the present technical solution, the cross-sectional area of ​​the first groove 311 gradually decreases along the depth direction of the first groove 311. In one embodiment, the first groove 311 may be a tapered groove. In other words, the longitudinal cross section of the first groove 311 may be a triangle.

[0101] In one embodiment, Figure 1 , the first groove 311 can be a conical curved groove. That is, the longitudinal section of the first groove 311 is curved. It can be understood that when the light emitting surface is a curved surface, the emitted light is along the normal direction of each point on the curved surface. The first groove 311 is set as a conical curved groove, and the light emitted by the light-emitting area 21 of the light-emitting device 20 can enter the uniform light structure plate 30 along the normal direction of each point on the curved surface, so that the light entering the uniform light structure plate 30 is more divergent, which is conducive to further improving the uniform light effect.

[0102] For example, the longitudinal cross section of the first groove 311 may be in the shape of a parabola, an ellipse or an arc. Such a structure can reduce the difficulty of manufacturing the first groove 311.

[0103] In one embodiment, Figure 1 and 2 As shown, the size d5 of the opening diameter of the first groove 311 can be 0.7 mm to 1.2 mm. For example, the size d5 of the opening diameter of the first groove 311 can be 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm or 1.2 mm. The depth H1 of the first groove 311 can be 0.1 mm to 0.3 mm. For example, the depth H1 of the first groove 311 can be 0.1 mm, 0.15 mm, 0.19 mm, 0.25 mm or 0.3 mm.

[0104] Such a first groove 311 can ensure that the side wall of the first groove 311 has a suitable distance from the light-emitting device 20 by setting the opening diameter d5 and the depth H1 of the first groove 311, which can not only make the light-emitting device 20 completely located in the first groove 311, but also ensure the intensity of light received by the side wall of the first groove 311.

[0105] Exemplarily, the first grooves 311 may correspond to the light emitting devices 20 on the light emitting substrate 20 one by one, and the interval between adjacent first grooves 311 may be the same as the interval between adjacent light emitting devices 20 .

[0106] In another embodiment, the longitudinal section of the first groove 311 may be in the shape of a frustum, that is, the first groove 311 has a bottom wall. In the longitudinal section of the first groove 311, the side wall of the first groove 311 may be a straight line or a curve.

[0107] Exemplarily, the transverse cross-section of the first groove 311 may be circular.

[0108] Fig.10 FIG. 1 is a schematic diagram of the structure of a backlight module. Figure 1 , Fig.10 There is no light-collecting structure 322 or second micro-pits 321 on the second surface of the middle light-homogenizing structure plate 30; Fig.10 No first micro-pits 312 are disposed on the first surface of the middle light-homogenizing structure plate 30 .

[0109] Fig.11 FIG. 1 is a schematic diagram of the structure of a backlight module. Fig.10 , Fig.11 A first micro-pit 312 is disposed on the first surface of the middle light homogenizing structure plate 30 .

[0110] Fig.12 FIG. 1 is a schematic diagram of the structure of a backlight module. Fig.10 , Fig.12 Second micro pits 321 and light focusing structures 322 are arranged on the second surface of the middle light uniforming structure plate 30 .

[0111] Fig.13 Shows Fig.10 The simulation diagram of the backlight module brightness is shown, where the left side is the simulation diagram of the backlight module brightness, and the right side is the brightness color scale diagram corresponding to the simulation diagram. It can be seen from the brightness color scale diagram that different colors represent different brightness values, and the color distribution in the simulation diagram on the left can reflect the brightness distribution. The parameters in the simulation include: the size of the light-emitting device is 218μm, and the distance between two adjacent light-emitting devices is 2.0mm. Among them, the backlight module includes 9 light-emitting devices 20 arranged in a 3*3 array, Fig.13 In the simulation diagram on the left, the horizontal axis is the spacing (in mm) between adjacent light-emitting devices 20 in the horizontal direction, and the vertical axis is the spacing (in mm) between adjacent light-emitting devices 20 in the vertical direction. It can be understood that the simulation diagram is a diagram after pseudo-color processing of brightness. The whiter the color in the diagram, the stronger the brightness; the smoother the color transition or the more consistent the color distribution, the more uniform the brightness distribution.

[0112] Those skilled in the art can understand that different colors in the brightness color scale diagram represent different brightness values. Generally, the whiter the color, the stronger the brightness; the smoother the color transition or the more consistent the color distribution, the more uniform the brightness distribution.

[0113] from Fig.13 It can be seen that Fig.10 The area where the backlight module light emitting device 20 is located (i.e., area B) is the whitest and has the highest brightness, while the area between two adjacent light emitting devices 20 (i.e., area A) has the lowest brightness. The brightness difference between area A and area B is large, and the uniformity of the light output brightness is poor.

[0114] Fig.14 Shows Fig.11 The simulation diagram of the backlight module brightness is shown, where the left side is the simulation diagram of the backlight module brightness, and the right side is the brightness color scale diagram corresponding to the simulation diagram. It can be seen from the brightness color scale diagram that different colors represent different brightness values, and the color distribution in the simulation diagram on the left can reflect the brightness distribution. The parameters in the simulation include: the size of the light-emitting device is 218μm, and the distance between two adjacent light-emitting devices is 2.0mm. Among them, the backlight module includes 9 light-emitting devices 20 arranged in a 3*3 array, Fig.14 In the simulation diagram on the left, the horizontal axis is the spacing (in mm) between adjacent light-emitting devices 20 in the horizontal direction, and the vertical axis is the spacing (in mm) between adjacent light-emitting devices 20 in the vertical direction. It can be understood that the simulation diagram is a diagram after pseudo-color processing of brightness. The whiter the color in the diagram, the stronger the brightness; the smoother the color transition or the more consistent the color distribution, the more uniform the brightness distribution.

[0115] Fig.11 Compared to Fig.10 The first micro-pits 312 are added, and the first micro-pits 312 can destroy the total reflection on the first surface between two adjacent light-emitting devices 20 (i.e., region A), so that the first micro-pits 312 can reflect more light to region A, thereby increasing the brightness of region A. Fig.14 The brightness of the area between two adjacent light emitting devices 20 (ie, area A) is compared with Fig.13 Enhanced. Since the central area G of the area surrounded by the four light-emitting devices 20 is large, more first micro-pits 312 can be set, so the brightness of the central area G of the area surrounded by the four light-emitting devices 20 is enhanced. The setting of the first micro-pits 312 improves the brightness of area A and improves the uniformity of the light output brightness. It has been proved through experiments that the setting of the first micro-pits 312 can improve the uniform light effect by about 12%.

[0116] Fig.15 Shows Fig.12The simulation diagram of the backlight module brightness is shown, where the left side is the simulation diagram of the backlight module brightness, and the right side is the brightness color scale diagram corresponding to the simulation diagram. It can be seen from the brightness color scale diagram that different colors represent different brightness values, and the color distribution in the simulation diagram on the left can reflect the brightness distribution. The parameters in the simulation include: the size of the light-emitting device is 218μm, and the distance between two adjacent light-emitting devices is 2.0mm. Among them, the backlight module includes 9 light-emitting devices 20 arranged in a 3*3 array, Fig.15 In the simulation diagram on the left, the horizontal axis is the spacing (in mm) between adjacent light-emitting devices 20 in the horizontal direction, and the vertical axis is the spacing (in mm) between adjacent light-emitting devices 20 in the vertical direction. It can be understood that the simulation diagram is a diagram after pseudo-color processing of brightness. The whiter the color in the diagram, the stronger the brightness; the smoother the color transition or the more consistent the color distribution, the more uniform the brightness distribution.

[0117] from Fig.15 It can be seen that due to Fig.12 Compared to Fig.10 A second micro-pit 321 and a focusing structure 322 are added. The second micro-pit 321 can reflect part of the light directly above the light-emitting device 20 to the surroundings, so that the color brightness of the area where the light-emitting device 20 is located (i.e., area B) is reduced by about 17%, and the brightness is more uniform; at least part of the light reflected by the second micro-pit 321 enters between two adjacent light-emitting devices 20 (i.e., area A), and area A is also provided with a focusing structure 322, which can take out the light from area A and focus the light, further improving the brightness of area A, and the brightness of the periphery of the nine light-emitting devices 20 is compared with Fig.14 The uniformity of the brightness of the entire screen is enhanced. Experiments have shown that the provision of the light-focusing structure 322 can improve the uniform light effect by about 30%.

[0118] Fig.16 for Figure 1 The simulation diagram of the backlight module brightness is shown, where the left side is the simulation diagram of the backlight module brightness, and the right side is the brightness color scale diagram corresponding to the simulation diagram. It can be seen from the brightness color scale diagram that different colors represent different brightness values, and the color distribution in the simulation diagram on the left can reflect the brightness distribution. The parameters in the simulation include: the size of the light-emitting device is 218μm, and the distance between two adjacent light-emitting devices is 2.0mm. Among them, the backlight module includes 9 light-emitting devices 20 arranged in a 3*3 array, Fig.16The horizontal axis of the simulation diagram on the left is the spacing between adjacent light-emitting devices 20 in the horizontal direction (unit: mm), and the vertical axis is the spacing between adjacent light-emitting devices 20 in the vertical direction (unit: mm). It can be understood that the simulation diagram is a diagram after pseudo-color processing of brightness. The whiter the color in the diagram, the stronger the brightness; the smoother the color transition or the more consistent the color distribution, the more uniform the brightness distribution.

[0119] from Fig.16 It can be seen that due to Figure 1 for Fig.11 and Fig.12 The combination of Figure 1 A first micro-pit 312, a second micro-pit 321 and a focusing structure 322 are provided in the Fig.12 , Figure 1 The first micro-pit 312 is added. The first micro-pit 312 can destroy the total reflection on the first surface between two adjacent light-emitting devices 20 (i.e., region A), and the first micro-pit 312 can reflect more light to region A, so that the brightness of region A is further increased. Fig.16 As shown, the brightness of area A is compared to Fig.15 Further improvement, the brightness of area A is increased by about 30%, so that the brightness difference between area A and area B is greatly reduced, the color distribution of the area surrounded by the 9 light-emitting devices 20 is more uniform, the brightness of the picture is more uniform, and the light-emitting area of ​​the light-emitting module is closer to the surface light source, solving the problem of lamp shadow.

[0120] The light-emitting module of the disclosed embodiment reduces the brightness of area B, increases the brightness of area A, reduces the brightness difference between area A and area B, improves the uniformity of the light output brightness of the uniform light structure plate 30, and solves the problem of lamp shadow by setting the first micro-pit 312, the second micro-pit 321 and the focusing structure 322. It also reduces the use of film materials such as uniform light films, and no longer requires a mixing distance, which is beneficial to reducing the thickness of the display device and realizing a lightweight design of the product.

[0121] In one embodiment, Figure 2 As shown, the bottom surface of the first groove 311 is oriented toward the first surface (in Figure 2 A first reflective layer 41 is disposed on the bottom surface of the first groove 311.

[0122] A first reflective layer 41 is arranged on the bottom surface of the first groove 311, which can reduce the amount of light directly above the light-emitting device 20, so that more light emitted by the light-emitting device 20 enters the light-uniform structure plate 30 through the side wall of the first groove 311, and can be emitted from the second surface of area A after being transmitted in the light-uniform structure plate 30, thereby increasing the amount of light emitted from area A, improving the brightness of area A, improving the light-uniformity effect of the light-uniform structure plate 30, and improving the brightness uniformity of the light output from the backlight module.

[0123] When the light transmitted in the light uniforming structure plate 30 irradiates the first reflective layer 41 , the first reflective layer 41 can reflect the light toward the second surface of area B, thereby ensuring the light requirement directly above the first reflective layer 41 and ensuring the brightness of area B.

[0124] Exemplarily, the material of the first reflective layer may include a metal having a reflective property, such as silver.

[0125] In order to prevent the brightness of area B from being too weak, the first reflective layer 41 may have a preset transmittance. For example, the transmittance of the first reflective layer 41 may be 45% to 60%. For example, the transmittance of the first reflective layer 41 may be 45%, 50%, 55% or 60%. The specific value of the transmittance of the first reflective layer 41 may be set as needed.

[0126] Exemplarily, the light emitting device 20 can generally adopt an inorganic light emitting diode, and the light distribution form of the inorganic light emitting diode is generally a Lambertian body. Therefore, the forward light intensity of the inorganic light emitting diode is relatively strong. If the first reflective layer 41 is not provided, the color of the light directly above the inorganic light emitting diode will be bluish, resulting in the formation of a halo between the inorganic light emitting diode and the surrounding area. The first reflective layer 41 can reflect the light at the strongest position of the inorganic light emitting diode, so that the reflected light evenly enters the uniform light structure plate 30 through the side wall of the first groove 311, thereby avoiding uneven chromaticity. Therefore, the provision of the first reflective layer 41 not only improves the uniform light effect of the backlight module, but also makes the chromaticity distribution uniform.

[0127] A reflective film may be attached to the bottom surface of the first groove 311 to form the first reflective layer 41 ; or a metal plating layer having a semi-transmissive and semi-reflective property may be formed on the bottom surface of the first groove 311 , and the metal plating layer may form the first reflective layer 41 .

[0128] like Figure 2 As shown, the cone angle β of the conical surface may be 150° to 170°. For example, the angle β may be 150°, 160° or 170°.

[0129] Fig.17 for Figure 2 A schematic plan view of the position of the first light reflecting layer in FIG. 1 , for example, Fig.17 Can be Figure 2 G view in the figure. Fig.17 As can be seen from the figure, the cross section of the first groove 311 is circular.

[0130] Fig.18 FIG. 1 is a schematic diagram of the structure of a backlight module. Figure 2 , Fig.18 The first reflective layer 41 is not disposed on the bottom surface of the first groove 311 of the middle light homogenizing structure plate 30 .

[0131] Fig.19A for Fig.18 The Y chromaticity distribution diagram of the light output brightness of the backlight module is shown, where: Fig.19A The corresponding brightness color scale diagram is shown on the right side of FIG; Fig.19B for Fig.18 The X-chromaticity distribution diagram of the light output brightness of the backlight module is shown, where: Fig.19B The corresponding brightness color scale diagram is shown on the right side of FIG; Fig. 20 for Fig.18 The brightness distribution diagram of the backlight module is shown, where: Fig. 20 The corresponding brightness color scale diagram is shown on the right side. It can be seen from the brightness color scale diagram that different colors represent different brightness values. In the optical simulation, two light emitting devices 20 are used as an example for simulation. In the optical simulation model, the size of the LED is 118μm*118μm, and the spacing between adjacent LEDs is 0.5mm.

[0132] from Fig.19A and Fig.19B It can be seen that Fig.18 The chromaticity distribution of the light output brightness of the backlight module is very uneven. Fig. 20 It can be seen that there is an obvious dark area between the two first grooves 311 and the brightness distribution is uneven.

[0133] Fig.21A for Figure 2 The Y chromaticity distribution diagram of the light output brightness of the backlight module is shown, where: Fig.21A The corresponding brightness color scale diagram is shown on the right side of FIG; Fig.21B for Figure 2 The X-chromaticity distribution diagram of the light output brightness of the backlight module is shown, where: Fig. 21B The corresponding brightness color scale diagram is shown on the right side of FIG; Fig. 22 for Figure 2 The brightness distribution diagram of the backlight module is shown, where: Fig. 22The corresponding brightness color scale diagram is shown on the right side. It can be seen from the brightness color scale diagram that different colors represent different brightness values. In the optical simulation, two light emitting devices 20 are used as an example for simulation. In the optical simulation model, the size of the LED is 118μm*118μm, and the spacing between adjacent LEDs is 0.5mm.

[0134] from Fig.21A and Fig.21B It can be seen that Figure 2 The chromaticity distribution of the light output brightness of the backlight module shown is compared with Fig.19A More uniform. Fig. 22 It can be seen that due to the provision of the first reflective layer 41, compared with Fig. 20 , the brightness of the area where the first grooves 311 are located decreases, the brightness of the area between the first grooves 311 increases, and the brightness distribution uniformity of the light output brightness is significantly improved, and the brightness distribution uniformity can reach 70%.

[0135] The light-emitting module of the disclosed embodiment reduces the brightness of area B and increases the brightness of area A by setting a first reflective layer 41 on the bottom surface of the first groove 311, thereby improving the uniform light effect of the uniform light structure plate 30 and improving the brightness uniformity of the light output of the backlight module.

[0136] In one embodiment, Figure 2 As shown, the light emitting module may further include a color conversion material 50, and the color conversion material 50 may be located in the first groove 311. The color conversion material 50 may be used to modulate the first color light emitted by the light emitting device 20 into a second color light.

[0137] The first color light may be a blue light. The color conversion material 50 is configured to convert the incident first color light into a second color light, the color of the second color light being different from the color of the first color light.

[0138] For example, the second color light may be green light, and the color conversion material 50 may be a green color conversion material, which may convert blue light into green light.

[0139] For example, the second color light may be red light, and the color conversion material 50 may be a red color conversion material, which may convert blue light into red light.

[0140] Exemplarily, the color of the second color light can be the same as the color of the first color light. The color conversion material 50 can include a light-transmitting material. The first color light is converted into the second color light after passing through the light-transmitting material. The material of the light-transmitting material can include an organic material with good light transmittance, such as photoresist.

[0141] In order to achieve the conversion of light color, the color conversion material may include a quantum dot material, which may include a perovskite quantum dot material, a cadmium selenide quantum dot material or an indium phosphide quantum dot material.

[0142] The color conversion material may include an organic fluorescent material or fluorescent powder. The color conversion material may also be other materials that can convert the first color light into the second color light.

[0143] Exemplarily, the color conversion material 50 may include a red color conversion material, a green color conversion material, and a light-transmitting material, which may be respectively disposed in the first grooves 311 of corresponding colors. The red color conversion material converts the blue light emitted by the light-emitting device 20 into red light, and the green color conversion material converts the blue light emitted by the light-emitting device 20 into green light, and the blue light remains blue light after passing through the light-transmitting material.

[0144] In one embodiment, scattering particles are provided in the color conversion material 50. The scattering particles provided in the color conversion material can increase the propagation path of the blue light in the color conversion material and improve the conversion rate of the color conversion material to the blue light. The scattering particles provided in the light-transmitting material layer can disperse the blue light incident into the light-transmitting material layer, prevent the blue light from being emitted vertically from the light-transmitting material layer, and increase the amount of the first color light.

[0145] In one embodiment, Figure 1 and Figure 2 As shown, the light-emitting module may further include a second reflective layer 42, and the second reflective layer 42 is located on a surface of the light-homogenizing structure plate 30 facing the light-emitting device 20. For example, the second reflective layer 42 covers the first surface of the light-homogenizing structure plate 30, and the light-emitting device 20 is also covered by the second reflective layer 42. The second reflective layer 42 can reflect light back to the light-homogenizing structure plate 30 to avoid light loss caused by light being emitted from the first surface.

[0146] like Figure 2 As shown, the light-emitting module may further include a transparent encapsulation layer 60, which is located on the side of the light-emitting device 20 that is away from the light-homogenizing structure plate 30. The orthographic projection of the light-emitting device 20 on the first surface is located within the orthographic projection of the transparent encapsulation layer 60 on the first surface. Thus, the transparent encapsulation layer 60 can protect the light-emitting device 20.

[0147] Exemplarily, the orthographic projection of the first groove 311 on the first surface is located within the orthographic projection of the transparent encapsulation layer 60 on the first surface, so that the transparent encapsulation layer 60 can encapsulate the color conversion material 50 in the first groove 311 to provide encapsulation and protection for the color conversion material 50 .

[0148] The second reflective layer 42 may be located on a surface of the light uniforming structure plate 30 on which the transparent encapsulation layer 60 is formed.

[0149] In one embodiment, Figure 2 As shown, the outer surface of the transparent encapsulation layer 60 may be a curved surface, for example, the outer surface of the transparent encapsulation layer 60 may be an arc-shaped curved surface. For example, the outer surface of the transparent encapsulation layer 60 may be a spherical surface. Then, a curved reflective surface will also be formed at the position of the transparent encapsulation layer 60 on the second reflective layer 42. The curved reflective surface can not only better reflect the light back to the light homogenizing structure plate 30, but also change the transmission path of the light, which is conducive to the reflected light entering the area A and emitting from the second surface of the area A, further improving the brightness of the area A and improving the homogenizing effect.

[0150] The transparent encapsulation layer 60 may be made of transparent materials such as silica gel.

[0151] Fig.23 for Figure 2 The schematic diagram of the relationship between the ratio of the size of the light emitting device in the light emitting module to the projection diameter of the first reflective layer on the first surface and the light output brightness is shown, Fig.23 The curve includes brightness curve and uniformity curve, where line a is the brightness curve and line b is the uniformity curve. Fig.23 The horizontal axis is the ratio of the size of the light-emitting device to the projection diameter of the first reflective layer on the first surface, and the vertical axis is the normalized value of the brightness; for the uniformity curve, Fig.23 The abscissa is the ratio of the size of the light emitting device to the diameter of the projection of the first reflective layer on the first surface, and the ordinate is the ratio of the minimum brightness value to the maximum brightness value.

[0152] refer to Figure 2 and Fig.23 The smaller the ratio of the size of the light-emitting device to the projected diameter of the first reflective layer on the first surface, the smaller the size of the light-emitting device relative to the first reflective layer. In this case, the light-emitting device is concentrated in the center of the first reflective layer. The smaller the area directly facing the light-emitting device and the first reflective layer, the less light is lost, and more light is reflected by the first reflective layer and enters the light-uniform structure plate 30 through the side wall of the first groove 311. Therefore, the smaller the ratio of the size of the light-emitting device to the projected diameter of the first reflective layer on the first surface, the higher the brightness.

[0153] from Fig.23 It can be seen from the figure that although the smaller the ratio of the size of the light-emitting device to the diameter of the projection of the first reflective layer on the first surface, the higher the brightness, the ratio of the size of the light-emitting device to the diameter of the projection of the first reflective layer on the first surface has little effect on the brightness uniformity. Therefore, in practice, a light-emitting device with a smaller size can be selected, for example, MicroLED is preferably selected as the light-emitting device.

[0154] The light-emitting module of the disclosed embodiment improves the light-homogenizing effect of the light-homogenizing structure plate by providing a first groove, a microstructure and a focusing structure. It is no longer necessary to provide a diffusion plate, a light-homogenizing film and other film layers in the light-emitting module, and it is no longer necessary to set an OD value. The number of film layers is greatly reduced, and the thickness of the light-emitting module is reduced, thereby reducing the thickness of the display device and realizing a lightweight design of the product.

[0155] The light-emitting module in the embodiment of the present disclosure can be assembled in a display device as a backlight module, and can also be used as a light source in a lighting product.

[0156] Based on the inventive concept of the aforementioned embodiments, an embodiment of the present disclosure further provides a display device, which includes the light-emitting module in any embodiment of the present disclosure.

[0157] The display device may further include a display panel, which is located on a side of the light-homogenizing structure plate 30 in the light-emitting module that is away from the light-emitting device. The display panel may be a liquid crystal display panel, and the light-emitting module serves as a backlight in the display device.

[0158] The display device of the embodiment of the present disclosure, after adopting the light-emitting module of the embodiment of the present disclosure as the backlight module, can not only obtain a better picture effect, but also be thinner, which is conducive to the realization of an ultra-thin product.

[0159] The display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or the like.

[0160] In the description of this specification, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0161] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0162] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0163] In the present disclosure, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0164] The disclosure above provides many different embodiments or examples to implement different structures of the present disclosure. In order to simplify the present disclosure, the components and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0165] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A light emitting module, characterized in that: include: A light homogenizing structure plate comprises a first surface and a second surface arranged opposite to each other, wherein the first surface is provided with a plurality of first grooves, and the cross-sectional area of ​​the first grooves gradually decreases along the depth direction of the first grooves; A light-emitting device is arranged on the first surface, the light-emitting device corresponds to the first groove one by one, the light-emitting device includes a light-emitting area, the orthographic projection of the light-emitting area on the first surface is located within the orthographic projection of the first groove on the first surface, and the light generated by the light-emitting area of ​​the light-emitting device enters the light-homogenizing structure plate through the first groove and is emitted from the second surface side of the light-homogenizing structure plate; Wherein, the first surface is provided with a microstructure at least in a region between adjacent first grooves; and the second surface is provided with a light-focusing structure at least in a region between adjacent first grooves.

2. The light emitting module according to claim 1, characterized in that: The light-homogenizing structure plate includes a light-exiting area, the orthographic projection of the first groove on the first surface is located in the light-exiting area, the light-emitting device is located in the light-exiting area, the microstructure is located in the light-exiting area and in an area outside the first groove, and the focusing structure is located in the light-exiting area and in an area outside the orthographic projection of the first groove on the second surface.

3. The light emitting module according to claim 1, characterized in that: The transverse cross-sectional area of ​​the light-concentrating structure gradually decreases in the direction from the first surface to the second surface, and the longitudinal cross-sectional shape of the light-concentrating structure is a triangle, a trapezoid, a parabola, an ellipse or an arc.

4. The light emitting module according to claim 1, characterized in that: The microstructure is a first micro-pit; or, the microstructure is a micro-protrusion.

5. The light emitting module according to claim 4, characterized in that: The microstructure is a first micro-pit, and a longitudinal section of the first micro-pit is a parabola shape, an ellipse shape or a circular arc shape.

6. The light emitting module according to claim 5, characterized in that: The longitudinal cross-section of the first micro-pit is semicircular, and the radius of the semicircle is 0.03 mm to 0.05 mm; and / or, The distance between the centers of two adjacent first micro-pits is 0.07 mm to 0.11 mm.

7. The light emitting module according to claim 1, characterized in that: The second surface is also provided with a second micro-pit, and the second micro-pit is located within the orthographic projection of the first groove on the second surface; The cross-sectional area of ​​the second micro-pit gradually decreases along the depth direction of the second micro-pit, and the second micro-pit is a conical pit.

8. The light emitting module according to claim 7, characterized in that: The bottom surface of the second micro-pit is a plane, and the bottom surface size of the second micro-pit is 0.04 mm to 0.06 mm; and / or, The distance between the centers of two adjacent second micro-pits is 0.05 mm to 0.07 mm; and / or, The cone angle of the second micro-pit is 45° to 65°.

9. The light emitting module according to any one of claims 1 to 6, characterized in that: The bottom surface of the first groove is a conical surface protruding toward the first surface, and a first reflective layer is arranged on the bottom surface of the first groove.

10. The light emitting module according to claim 9, characterized in that: The cone angle of the conical surface is 150° to 170°.

11. The light emitting module according to claim 9, characterized in that: The light transmittance of the first reflective layer is 45% to 60%.

12. The light emitting module according to claim 1, characterized in that: It also includes a color conversion material, which is located in the first groove and is used to convert the first color light generated by the light emitting device into a second color light.

13. The light emitting module according to claim 1, characterized in that: The light-emitting module further includes a second reflective layer, and the second reflective layer is located on a surface of the light-homogenizing structure plate on one side facing the light-emitting device; and / or, The light-emitting module further includes a transparent encapsulation layer, which is located on a side of the light-emitting device away from the light-homogenizing structure plate, and the orthographic projection of the light-emitting device on the first surface is located within the orthographic projection of the transparent encapsulation layer on the first surface.

14. The light emitting module according to claim 1, characterized in that: A metal wiring is disposed on the first surface of the light uniforming structure plate, and the light emitting device is coupled to the metal wiring.

15. A display device, characterized in that: The light-emitting module comprises the light-emitting module according to any one of claims 1 to 14, and further comprises a display panel, wherein the display panel is located on a side of the light-homogenizing structure plate away from the light-emitting device.

Images