Light-emitting substrate, backlight module, and display device

Abstract

A light-emitting substrate, a backlight module, and a display device. The light-emitting substrate comprises a circuit board, a light-emitting device and a lens; the light-emitting device is arranged on one side of the circuit board and is connected to the circuit board; the lens is arranged at the periphery of the light-emitting device, and the lens is in sealed connection to the circuit board. When the light-emitting substrate is applied to a backlight module of a display device, the brightness of the light exit surface of the display device is uniform, thereby achieving a good display effect.

Description

Light-emitting substrate, backlight module and display device Technical Field

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

[0002] Liquid crystal display devices have the advantages of energy saving, low radiation, low distortion, and thin thickness, and have been widely integrated into people's daily lives. Liquid crystal display devices generally include a liquid crystal display panel and a backlight module that provides light source for the liquid crystal display panel. The backlight module includes a direct-type backlight module and an edge-type backlight module. SUMMARY OF THE INVENTION

[0003] The direct-lit backlight module includes a light-emitting substrate and a diffusion plate and an optical component disposed above the light-emitting substrate. As shown in FIG1 , a light-emitting device 20 ′ (eg, Mini LED), a lens 30' is usually provided above the light-emitting device 20' to diverge the light emitted by the light-emitting device 20'. The outer surface of the light-emitting device 20' is usually wrapped with a layer of colloid 60 to protect the light-emitting device 20' from the influence of moisture and oxygen in the environment. Since the shape of the colloid 60 wrapped on the outer surface of the light-emitting device 20' is difficult to effectively control during the manufacturing process, the shape of the colloid 60 wrapped on the outer surface of different light-emitting devices on the light-emitting substrate 100' is different. Since the colloid 60 is similar to a curved lens and can diverge the light emitted by the light-emitting device 20', the light of the same angle is diverged by the colloids 60 of different shapes, and the output angle of the diverged light is also different. As a result, the light emitted by different light-emitting devices 20' after being diverged by the colloid 60 and the lens 30' has different light pattern distributions. When the light-emitting substrate 100' is used in the backlight module of a display device, it will cause the light-emitting surface of the display device to have uneven brightness.

[0004] The embodiments of the present application provide a light-emitting substrate, a backlight module and a display device. The light emitted by different light-emitting devices on the light-emitting substrate maintains the same light distribution after being diverged by a lens. When the light-emitting substrate is used in the backlight module of a display device, the brightness of the light-emitting surface of the display device is uniform, and a better display effect can be achieved.

[0005] In a first aspect, an embodiment of the present application provides a light-emitting substrate, comprising:

[0006] circuit boards;

[0007] a light emitting device, disposed on one side of the circuit board and connected to the circuit board;

[0008] a lens, disposed on the periphery of the light-emitting device, and the lens is sealed and connected to the circuit board;

[0009] The lens is spaced apart from the light emitting device, and the space enclosed by the lens, the light emitting device and the circuit board is kept in a vacuum state.

[0010] In some embodiments, the lens and the circuit board are sealed together via an adhesive layer.

[0011] In some embodiments, the lens is spaced apart from the light emitting device, and a space enclosed by the lens, the light emitting device, and the circuit board is kept in a vacuum state.

[0012] In some embodiments, the vacuum degree in the space enclosed by the lens, the light-emitting device, and the circuit board is less than or equal to 500 Pa.

[0013] In some embodiments, the lens has an inner surface and an outer surface that are opposite to each other, the inner surface is disposed close to the light emitting device, and a gap is maintained between the inner surface and the light emitting device.

[0014] In some embodiments, both the inner surface and the outer surface are curved surfaces, the inner surface is concave in a direction away from the circuit board, and the outer surface is convex in a direction away from the circuit board, and a central area of ​​the inner surface is concave in a pointed shape in a direction away from the circuit board, and a central area of ​​the outer surface is concave in a pointed shape in a direction toward the circuit board;

[0015] In a direction perpendicular to the circuit board, a vertex of a central area of ​​the inner surface and a vertex of a central area of ​​the outer surface correspond to a geometric center of the light emitting device.

[0016] In some embodiments, the lens further includes a bottom surface having an inner edge intersecting with the inner surface and an outer edge intersecting with the outer surface, and the lens is connected to the circuit board through the bottom surface.

[0017] In some embodiments, the bottom surface is a plane, or the bottom surface is stepped, or a plurality of microstructures are arranged at intervals on the bottom surface.

[0018] In some embodiments, the inner edge of the bottom surface forms a circle on the circuit board, and the radius of the circle is R;

[0019] In a direction perpendicular to the circuit board, the point on the inner surface of the lens that is farthest from the light-emitting device is a vertex, the vertex of the inner surface corresponds to the center of the circle, and the distance between the vertex of the inner surface and the center of the circle is H;

[0020] H : R = (1.5-5) : 1.

[0021] In some embodiments, a plurality of spaced-apart light-emitting devices are provided on the circuit board, and the lens is provided on the periphery of each light-emitting device. The light-emitting substrate further includes a reflective sheet provided on the circuit board and located between adjacent lenses.

[0022] In some embodiments, the inner surface of the lens includes a first vertical surface, a first horizontal surface, a second vertical surface, and a first inclined surface;

[0023] The first vertical surface is perpendicular to the bottom surface, and one end of the first vertical surface intersects with the inner edge of the bottom surface, and the first vertical surface is cylindrical;

[0024] The first horizontal plane is perpendicular to the first vertical plane, and one end of the first horizontal plane intersects with an end of the first vertical plane away from the bottom plane, and the first horizontal plane is annular;

[0025] The second vertical surface is perpendicular to the first horizontal surface, and one end of the second vertical surface intersects with an end of the first horizontal surface away from the first vertical surface, and the second vertical surface is cylindrical; the distance between the light emitting device and the second vertical surface is smaller than the distance between the light emitting device and the first vertical surface;

[0026] The first inclined surface is concave in a cone shape in a direction away from the circuit board, and the end of the first inclined surface away from the vertex intersects with the end of the second vertical surface away from the first horizontal surface. In the direction perpendicular to the circuit board, the vertex of the first inclined surface corresponds to the geometric center of the light-emitting device.

[0027] In some embodiments, the outer surface of the lens includes a third vertical surface, a second inclined surface, and a third inclined surface;

[0028] The third vertical surface is perpendicular to the bottom surface, and one end of the third vertical surface intersects with the outer edge of the bottom surface, and the third vertical surface is cylindrical;

[0029] The included angle between the second inclined surface and the third vertical surface is an obtuse angle, and the second inclined surface intersects with an end of the third vertical surface away from the bottom surface, and an orthographic projection of the end of the second inclined surface away from the third vertical surface on the circuit board is located outside the orthographic projection of the end of the second inclined surface intersecting with the third vertical surface on the circuit board;

[0030] The third inclined surface is concave in a cone shape toward the direction approaching the circuit board, and the end of the third inclined surface away from the vertex intersects with the second inclined surface. The angle between the third inclined surface and the second inclined surface is an acute angle. In the direction perpendicular to the circuit board, the vertex of the third inclined surface corresponds to the vertex of the first inclined surface.

[0031] In a second aspect, an embodiment of the present application provides a backlight module, comprising:

[0032] A light-emitting substrate, wherein the light-emitting substrate is the light-emitting substrate described above;

[0033] The optical component is arranged on one side of the light-emitting substrate, and the optical component is arranged on a side of the lens away from the circuit board.

[0034] In some embodiments, the optical component includes a diffuser plate and an optical film, the diffuser plate is disposed on a side of the lens away from the circuit board, and the optical film is disposed on a side of the diffuser plate away from the lens.

[0035] In a third aspect, an embodiment of the present application provides a display device, including:

[0036] Display panel;

[0037] The backlight module is the backlight module described above; the backlight module is arranged on the non-light-emitting side of the display panel, and the optical components in the backlight module are arranged close to the display panel. Beneficial effects

[0038] The light-emitting substrate provided in the embodiment of the present application can prevent water vapor and oxygen in the external environment from entering the light-emitting device and affecting it by sealing the lens and the circuit board, thereby extending the service life of the light-emitting device. Compared with the technical solution in the prior art of setting a colloid on the outer surface of the light-emitting device to protect the light-emitting device, since the light-emitting substrate in the embodiment of the present application does not set a colloid on the outer surface of the light-emitting device, it can avoid the problem that the colloid has different diverging effects on light due to the appearance differences caused by the production process of the colloid, so that the emitted light of each light-emitting device on the light-emitting substrate maintains the same light type distribution after being diverged by the lens. When the light-emitting substrate is applied to the backlight module of a display device, the brightness of the light-emitting surface of the display device is uniform, and a better display effect can be achieved. In addition, since the process of applying the colloid on the outer surface of the light-emitting device and baking the colloid is omitted in the production process of the light-emitting substrate, the production cost of the light-emitting substrate can be significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the following briefly introduces the drawings required for describing the embodiments. The drawings described below are only some embodiments of this application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0040] FIG1 is a schematic diagram of a light path in a conventional light-emitting substrate.

[0041] FIG2 is a schematic diagram of the first structure of the light-emitting substrate provided in an embodiment of the present application.

[0042] FIG3 is an enlarged schematic diagram of a partial area in FIG1 .

[0043] FIG4 is a schematic diagram showing a lens provided in an embodiment of the present application having a stepped bottom surface.

[0044] FIG5 is a schematic diagram of a lens provided in an embodiment of the present application having a microstructure on its bottom surface.

[0045] FIG6 is a schematic diagram of the light path in the light-emitting substrate provided in an embodiment of the present application.

[0046] FIG7 is a schematic diagram of a second structure of the light-emitting substrate provided in an embodiment of the present application.

[0047] FIG8 is an enlarged schematic diagram of a partial area in FIG7 .

[0048] FIG9 is a schematic structural diagram of a backlight module provided in an embodiment of the present application.

[0049] FIG10 is a schematic structural diagram of a display device provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0051] Referring to Figures 2 to 8, an embodiment of the present application provides a light-emitting substrate 100, including a circuit board 10, a light-emitting device 20 and a lens 30. The light-emitting device 20 is arranged on one side of the circuit board 10 and connected to the circuit board 10; the lens 30 is arranged on the periphery of the light-emitting device 20, and the lens 30 is sealed and connected to the circuit board 10.

[0052] Exemplarily, the light emitting device 20 may be a Mini LED (sub-millimeter light emitting diode) or a Micro LED (micro light emitting diode display).

[0053] For example, the number of the light emitting devices 20 provided on the circuit board 10 may be one or more, where a plurality refers to two or more.

[0054] Exemplarily, the circuit board 10 may be a PCB (Printed Circuit Board).

[0055] Exemplarily, the material of the lens 30 may include at least one of polymethyl methacrylate (PMMA), glass, and silicone resin.

[0056] The light-emitting substrate 100 provided in the embodiment of the present application can prevent moisture and oxygen in the external environment from entering the light-emitting device 20 and affecting it by sealing the lens 30 with the circuit board 10, thereby extending the service life of the light-emitting device 20. Compared with the technical solution of providing a colloid 60 on the outer surface S2 of the light-emitting device 20 in the prior art to protect the light-emitting device 20, since the light-emitting substrate 100 of the embodiment of the present application does not provide a colloid on the outer surface S2 of the light-emitting device 20, it can avoid the difference in appearance caused by the production process of the colloid that causes the colloid to be affected by light. The problem of different divergence effects is solved so that the light emitted by each light-emitting device 20 on the light-emitting substrate 100 maintains the same light distribution after being diverged by the lens 30. When the light-emitting substrate 100 is applied to the backlight module 300 of the display device 500, the brightness of the light-emitting surface of the display device 500 is uniform, and a better display effect can be achieved. In addition, since the process of applying the colloid on the outer surface S2 of the light-emitting device 20 and baking the colloid is omitted in the production process of the light-emitting substrate 100, the production cost of the light-emitting substrate 100 can be significantly reduced.

[0057] Referring to Figures 2 to 8 , the lens 30 is spaced apart from the light-emitting device 20, and the space enclosed by the lens 30, the light-emitting device 20, and the circuit board 10 is maintained in a vacuum state. It is understood that when the space enclosed by the lens 30, the light-emitting device 20, and the circuit board 10 is maintained in a vacuum state, it means that there is no air or only a very small amount of air in the space enclosed by the lens 30, the light-emitting device 20, and the circuit board 10, thereby preventing water vapor and oxygen in the air from corroding the light-emitting device 20, thereby improving the service life of the light-emitting device 20. Furthermore, since the light path of light hardly changes when passing through the vacuum environment, the light emitted by each light-emitting device 20 on the light-emitting substrate 100 can maintain the same light distribution after being diverged by the lens 30. When the light-emitting substrate 100 is used in the backlight module 300 of the display device 500, the brightness uniformity of the light emitted from the display surface of the display device 500 can be improved, thereby improving the display effect of the display device 500.

[0058] Exemplarily, the vacuum degree in the interval space enclosed by the lens 30, the light-emitting device 20 and the circuit board 10 is less than or equal to 500 Pa (Pa). Exemplarily, the vacuum degree in the interval space can be 500 Pa, 450 Pa, 400 Pa, 350 Pa, 300 Pa, 250 Pa, 200 Pa, 150 Pa, 100 Pa, 50 Pa, 20 Pa, 0 Pa, etc.

[0059] For example, among the plurality of light-emitting devices 20 disposed on the circuit board 10 , the vacuum degree in the space enclosed between any light-emitting device 20 and its peripheral lens 30 and the circuit board 10 at the bottom is equal.

[0060] In some other embodiments, the space enclosed by the lens 30, the light-emitting device 20 and the circuit board 10 may be filled with a protective gas. The protective gas may include at least one of nitrogen and an inert gas. The inert gas may include at least one of helium (He), neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe). It can be understood that by filling the protective gas in the gap space enclosed by the lens 30, the light-emitting device 20 and the circuit board 10, it is equivalent to using the protective gas to drive out the air in the gap space enclosed by the lens 30, the light-emitting device 20 and the circuit board 10, thereby preventing the water vapor and oxygen in the air from corroding the light-emitting device 20, thereby improving the service life of the light-emitting device 20; and, since the same protective gas (with the same refractive index) is filled in each light-emitting device 20, the shape of the gap space enclosed by any light-emitting device 20 and its outer lens 30 and the bottom circuit board 10 is the same, so the emitted light of each light-emitting device 20 on the light-emitting substrate 100 can maintain the same light type distribution after being diverged by the lens 30. When the light-emitting substrate 100 is applied to the backlight module 300 of the display device 500, the uniformity of the light output brightness of the display surface of the display device 500 can be improved, thereby improving the display effect of the display device 500.

[0061] 3 and 8 , the lens 30 has an inner surface S1 and an outer surface S2 that are opposite to each other. The inner surface S1 is disposed close to the light emitting device 20 , and a gap is maintained between the inner surface S1 and the light emitting device 20 .

[0062] Referring to FIG. 3 , both the inner surface S1 and the outer surface S2 are curved surfaces. The inner surface S1 is concave in a direction away from the circuit board 10 , while the outer surface S2 is convex in a direction away from the circuit board 10 . Furthermore, the central area of ​​the inner surface S1 is concave in a pointed shape in a direction away from the circuit board 10 , while the central area of ​​the outer surface S2 is concave in a pointed shape in a direction toward the circuit board 10 .

[0063] In a direction perpendicular to the circuit board 10 , the vertex of the central area of ​​the inner surface S1 and the vertex of the central area of ​​the outer surface S2 correspond to the geometric center of the light emitting device 20 .

[0064] It should be noted that in the embodiment shown in Figure 3, the emitted light of the light emitting device 20 is successively refracted on the inner surface S1 of the lens 30 and on the inner surface S1 of the lens 30, and the emission angle of the light becomes larger, thereby forming a light divergence effect. Since when the light is emitted from the lens 30 in Figure 3, most of the light is emitted upward and obliquely upward, and only a very small amount of light is emitted from the oblique bottom of the lens 30, there is no need to set a reflective sheet between adjacent lenses 30 to further diverge the light by reflection. Therefore, the lens 30 in Figure 3 can be called a transmissive lens.

[0065] 3 and 8 , the lens 30 further includes a bottom surface S3 having an inner edge intersecting with the inner surface S1 and an outer edge intersecting with the outer surface S2 . The lens 30 is connected to the circuit board 10 via the bottom surface S3 .

[0066] 3 and 8 , an adhesive layer 40 may be disposed between the bottom surface S3 of the lens 30 and the circuit board 10 , so that the lens 30 and the circuit board 10 are sealed and connected by the adhesive layer 40 .

[0067] Illustratively, the bonding layer includes at least one of an adhesive and a double-sided tape.

[0068] Illustratively, the adhesive may include at least one of urea-formaldehyde resin adhesive, polyvinyl acetate adhesive, polyacrylic resin adhesive, polyurethane adhesive, hot melt adhesive, and epoxy resin adhesive.

[0069] For example, double-sided tape refers to an adhesive tape made of paper, cloth or plastic film as a base material, and an adhesive evenly coated on the above base material.

[0070] Please refer to FIG. 3 , the bottom surface S3 may be a plane.

[0071] Please refer to Figure 4. The bottom surface S3 can also be stepped, that is, the bottom surface S3 can include stair surfaces and step surfaces arranged alternately. It can be understood that when the bottom surface S3 is stepped, since light can be reflected on multiple stair surfaces and multiple step surfaces, the divergence of light can be further improved, thereby improving the light output uniformity of the light-emitting substrate 100.

[0072] Referring to FIG. 5 , the bottom surface S3 may further include a plurality of spaced-apart microstructures 70. For example, the microstructures 70 may be grooves recessed toward the interior of the lens 30. It is understood that when the bottom surface S3 includes a plurality of spaced-apart microstructures 70, when light is incident on the microstructures 70 and reflected, the reflected light becomes more divergent, thereby improving the uniformity of light output from the light-emitting substrate 100.

[0073] Please refer to FIG3 , the inner edge of the bottom surface S3 forms a circle on the circuit board 10 , and the radius of the circle is R;

[0074] In a direction perpendicular to the circuit board 10 , the point on the inner surface S1 of the lens 30 that is farthest from the light-emitting device 20 is a vertex. The vertex of the inner surface S1 corresponds to the center of the circle, and the distance between the vertex of the inner surface S1 and the center of the circle is H.

[0075] H : R = (1.5-5) : 1.

[0076] For example, in the embodiment of the present application, H:R may be 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, etc. It is understood that when the ratio of H / R is larger, the curvature of the inner surface S1 of the lens 30 is larger (the radius of curvature is smaller), that is, the inner surface S1 is steeper.

[0077] It can be understood that, in the present application, the direction perpendicular to the circuit board 10 is the direction from the circuit board 10 to the light-emitting device 20 .

[0078] Please refer to FIG1 . In the existing light emitting substrate 100 ', since the outer surface S2 ' of the light emitting device 20 ' needs to be wrapped with the colloid 60 , the composite of the light emitting device 20 ' and the colloid 60 occupies a large area on the surface of the circuit board 10 '. The inner surface S1' of the lens 30' needs to maintain a certain distance from the colloid 60, resulting in a larger area of ​​the area enclosed by the inner edge of the bottom surface S3' of the lens 30'. Since the display device 500' needs to maintain a lightweight and thin design, that is, the thickness of the display device 500 is limited, the height of the lens 30' is limited. It can be understood that when the height of the lens 30 is small (H is small), but the area enclosed by the inner edge of the bottom surface S3' of the lens 30' is large (R is large), H / R is small, and the curvature of the inner surface S1' of the lens 30 is relatively gentle (the radius of curvature is large). At this time, after the light of the light emitting device 20' is refracted twice by the inner surface S1' and the outer surface S2' of the lens 30', the divergence angle of the outgoing light is small, resulting in a lower degree of light divergence, which in turn makes the light output uniformity of the light emitting substrate 100' poor.

[0079] Referring to FIG. 6 , in the embodiment of the present application, since the outer surface S2 of the light-emitting device 20 does not need to be coated with a colloid, the area occupied by the light-emitting device 20 on the surface of the circuit board 10 is much smaller than the area occupied by the complex of the light-emitting device and the colloid in the prior art. In this case, the area enclosed by the inner edge of the bottom surface S3 of the lens 30 can be designed to be smaller, that is, the inner edge of the bottom surface S3 of the lens 30 is closer to the light-emitting device 20. In this case, when the height of the lens 30 remains unchanged (H remains unchanged), the area enclosed by the inner edge of the bottom surface S3 of the lens 30 is reduced (R is reduced), and H / R increases. In this case, the inner surface S1 of the lens 30 can form a larger curvature (smaller radius of curvature). In this case, after the light is refracted twice by the inner surface S1 and the outer surface S2 of the lens 30, the divergence angle of the emitted light is larger, resulting in a higher degree of light divergence, thereby improving the uniformity of the light output of the light-emitting substrate 100.

[0080] Referring to Figure 7 , a circuit board 10 is provided with a plurality of spaced-apart light-emitting devices 20, each of which is surrounded by a lens 30. The light-emitting substrate 100 further includes a reflective sheet 50 disposed on the circuit board 10 and positioned between adjacent lenses 30. It should be noted that in the embodiments of the present application, the term "plurality" may refer to two or more.

[0081] It can be understood that when the structure of the lens 30 allows part of the emitted light to be emitted obliquely downward (i.e., toward the circuit board 10), by arranging a reflective sheet 50 between adjacent lenses 30, the reflective sheet 50 can be used to reflect this part of the light, so that light can also be emitted in the interval area between the lenses 30, thereby eliminating the dark area between adjacent light-emitting devices 20, making the light output of each area of ​​the light-emitting substrate 100 uniform and consistent, thereby improving the light output uniformity of the backlight module 300.

[0082] Exemplarily, the material of the reflective sheet 50 may include metal, and the metal may include at least one of aluminum, silver, and gold.

[0083] Referring to FIG. 8 , the inner surface S1 of the lens 30 includes a first vertical surface S11 , a first horizontal surface S12 , a second vertical surface S13 , and a first inclined surface S14 ;

[0084] The first vertical surface S11 is perpendicular to the bottom surface S3, and one end of the first vertical surface S11 intersects with the inner edge of the bottom surface S3. The first vertical surface S11 is cylindrical.

[0085] The first horizontal plane S12 is perpendicular to the first vertical plane S11, and one end of the first horizontal plane S12 intersects with an end of the first vertical plane S11 away from the bottom plane S3, and the first horizontal plane S12 is annular;

[0086] The second vertical surface S13 is perpendicular to the first horizontal surface S12, and one end of the second vertical surface S13 intersects with an end of the first horizontal surface S12 away from the first vertical surface S11. The second vertical surface S13 is cylindrical. The distance between the light emitting device 20 and the second vertical surface S13 is smaller than the distance between the light emitting device 20 and the first vertical surface S11.

[0087] The first inclined surface S14 is concave in a cone shape in a direction away from the circuit board 10, and the end of the first inclined surface S14 away from the vertex intersects with the end of the second vertical surface S13 away from the first horizontal surface S12. In the direction perpendicular to the circuit board 10, the vertex of the first inclined surface S14 corresponds to the geometric center of the light-emitting device 20.

[0088] 8 , the included angle between the first inclined surface S14 and the second vertical surface S13 is an obtuse angle, such as 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0089] It is understandable that the geometric center of the light emitting device 20 corresponds to the geometric center of the figure enclosed by the inner edge of the bottom surface S3 on the circuit board 10 (when the figure is circular, the geometric center is the center of the circle).

[0090] Referring to FIG. 8 , the first vertical surface S11 may be cylindrical, the first horizontal surface S12 may be annular, the second vertical surface S13 may be cylindrical, and the first inclined surface S14 may be conical.

[0091] 8 , the outer surface S2 of the lens 30 includes a third vertical surface S21 , a second inclined surface S22 , and a third inclined surface S23 ;

[0092] The third vertical surface S21 is perpendicular to the bottom surface S3, and one end of the third vertical surface S21 intersects with the outer edge of the bottom surface S3. The third vertical surface S21 is cylindrical.

[0093] The included angle between the second inclined surface S22 and the third vertical surface S21 is an obtuse angle, and the second inclined surface S22 intersects with an end of the third vertical surface S21 away from the bottom surface S3. The orthographic projection of the end of the second inclined surface S22 away from the third vertical surface S21 on the circuit board 10 is located outside the orthographic projection of the end of the second inclined surface S22 intersecting with the third vertical surface S21 on the circuit board 10.

[0094] The third inclined surface S23 is concave in the direction approaching the circuit board 10, and the end of the third inclined surface S23 away from the vertex intersects with the second inclined surface S22. The angle between the third inclined surface S23 and the second inclined surface S22 is an acute angle. In the direction perpendicular to the circuit board 10, the vertex of the third inclined surface S23 corresponds to the vertex of the first inclined surface S14.

[0095] For example, the angle between the second inclined surface S22 and the third vertical surface S21 may be 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0096] For example, the included angle between the third inclined surface S23 and the second inclined surface S22 may be 20°, 30°, 40°, 50°, 60°, 70°, 80°, etc.

[0097] Please refer to Figure 8. The height of the end of the third vertical surface S21 away from the bottom surface S3 can be greater than the height of the end of the second vertical surface S13 away from the bottom surface S3, and the distance between the end of the third vertical surface S21 away from the bottom surface S3 and the circuit board 10 is less than the distance between the vertex of the first inclined surface S14 and the circuit board 10.

[0098] It should be noted that the working principle of the lens 30 in Figure 8 is as follows: when the light emitted by the light-emitting device 20 is incident on the first inclined surface S14, a portion of the light is refracted once at the first inclined surface S14 and once at the third inclined surface, and then emitted from the top of the lens 30, while another portion of the light is totally reflected at the first inclined surface S14. The reflected light is refracted once after reaching the second inclined surface S22, and the refracted light is emitted obliquely downward. When the refracted light reaches the reflective sheet 50 between adjacent lenses 30, it is reflected, so that light can be emitted from the interval area between adjacent lenses 30, thereby eliminating the dark area between adjacent light-emitting devices 20, making the light output of each area of ​​the light-emitting substrate 100 uniform, and thus improving the light output uniformity of the backlight module 300. Since the lens 30 in Figure 8 can be combined with the reflective sheet 50 to achieve uniform light output by utilizing the reflection principle, it is equivalent to improving the divergence of the light output from the light-emitting device 20. Therefore, the lens 30 in Figure 8 can be called a reflective lens.

[0099] Referring to FIG. 8 , the third vertical surface S21 may be cylindrical, and the third inclined surface S23 may be conical.

[0100] 8 , when the first inclined surface S14 and the third inclined surface S23 are both conical, the cone angles of the first inclined surface S14 and the third inclined surface S23 are both obtuse angles, such as 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0101] Exemplarily, the preparation method of the light-emitting substrate 100 can be: first, the light-emitting device 20 is fixed on the circuit board 10, and then the circuit board 10 is transferred to the lens attaching equipment for vacuum treatment. When there is no air in the lens attaching equipment, the lens attaching process is performed, and the lens attaching process includes the steps of setting an adhesive layer 40 on the circuit board 10 and using the adhesive layer 40 to adhere the lens 30 to the circuit board 10.

[0102] When the light-emitting substrate 100 of the embodiment of the present application is mass-produced, a portion of samples can be selected after the production is completed. First, the lens 30 and the circuit board 10 are visually inspected to see whether they are fully enclosed and bonded. Then, the adhesive layer 40 between the lens 30 and the circuit board 10 is opened. Then, the equipment is used to inspect whether there is a negative pressure in the space enclosed by the lens 30, the light-emitting device 20 and the circuit board 10 as a basis for judging whether the interior of the lens 30 is a vacuum.

[0103] Please refer to Figure 9. The embodiment of the present application also provides a backlight module 300, including a light-emitting substrate 100 and an optical component 200. The light-emitting substrate 100 can be the light-emitting substrate 100 in any of the above embodiments; the optical component 200 is arranged on one side of the light-emitting substrate 100, and the optical component 200 is arranged on the side of the lens 30 away from the circuit board 10.

[0104] 9 , the optical assembly 200 may include a diffuser plate 210 and an optical film 220 . The diffuser plate 210 is disposed on a side of the lens 30 away from the circuit board 10 , and the optical film 220 is disposed on a side of the diffuser plate 210 away from the lens 30 .

[0105] Exemplarily, the optical film 220 may include a diffuser and a brightness enhancement film stacked in sequence in the direction from the light-emitting substrate 100 to the optical component 200. The diffuser can further enhance the divergence effect of light and make the light output more uniform. The brightness enhancement film can gather the scattered light on the front side, thereby improving the brightness of the light output.

[0106] Please refer to Figure 10. An embodiment of the present application also provides a display device 500, including a display panel 400 and a backlight module 300. The backlight module 300 can be the backlight module 300 in any of the above embodiments; the backlight module 300 is arranged on the non-light-emitting side of the display panel 400, and the optical component 200 in the backlight module 300 is arranged close to the display panel 400.

[0107] Exemplarily, the display panel 400 may be a liquid crystal display panel.

[0108] Exemplarily, the display device 500 may be a monitor, a television, a mobile phone, a tablet computer, a wearable device, etc.

[0109] The above describes in detail the light-emitting substrate, backlight module, and display device provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is intended only to facilitate understanding of the present application. Furthermore, those skilled in the art will appreciate that variations in the specific implementation methods and scope of application may occur based on the concepts of the present application. In summary, the contents of this specification should not be construed as limiting the present application.

Claims

1. A light-emitting substrate, comprising: Circuit boards; A light emitting device, disposed on one side of the circuit board and connected to the circuit board; A lens is arranged at the periphery of the light emitting device, and the lens is sealed and connected to the circuit board.

2. The light-emitting substrate according to claim 1, wherein: The lens and the circuit board are sealed and connected via an adhesive layer.

3. The light-emitting substrate according to claim 1, wherein: The lens is spaced apart from the light emitting device, and a space enclosed by the lens, the light emitting device and the circuit board is kept in a vacuum state.

4. The light-emitting substrate according to claim 3, wherein: The vacuum degree in the interval space enclosed by the lens, the light emitting device and the circuit board is less than or equal to 500 Pa.

5. The light emitting substrate according to claim 1, wherein: The lens has an inner surface and an outer surface that are arranged opposite to each other, the inner surface is arranged close to the light emitting device, and a gap is maintained between the inner surface and the light emitting device.

6. The light emitting substrate according to claim 5, wherein: The inner surface and the outer surface are both arc surfaces, the inner surface is concave in a direction away from the circuit board, the outer surface is convex in a direction away from the circuit board, and the central area of ​​the inner surface is concave in a pointed shape in a direction away from the circuit board, and the central area of ​​the outer surface is concave in a pointed shape in a direction close to the circuit board; In a direction perpendicular to the circuit board, a vertex of a central area of ​​the inner surface and a vertex of a central area of ​​the outer surface correspond to a geometric center of the light emitting device.

7. The light-emitting substrate according to claim 5, wherein: The lens further includes a bottom surface having an inner edge intersecting with the inner surface and an outer edge intersecting with the outer surface, and the lens is connected to the circuit board through the bottom surface.

8. The light-emitting substrate according to claim 7, wherein: The bottom surface is a plane, or the bottom surface is stepped, or a plurality of microstructures are arranged at intervals on the bottom surface.

9. The light emitting substrate according to claim 7, wherein: The inner edge of the bottom surface forms a circle on the circuit board, and the radius of the circle is R; In a direction perpendicular to the circuit board, the point on the inner surface of the lens that is farthest from the light-emitting device is a vertex, the vertex of the inner surface corresponds to the center of the circle, and the distance between the vertex of the inner surface and the center of the circle is H; H : R = (1.5-5) :

1.

10. The light emitting substrate according to claim 7, wherein: The circuit board is provided with a plurality of light emitting devices arranged at intervals, the lens is arranged on the periphery of each light emitting device, and the light emitting substrate further comprises a reflective sheet arranged on the circuit board and located between adjacent lenses.

11. The light emitting substrate according to claim 10, wherein: The inner surface of the lens includes a first vertical surface, a first horizontal surface, a second vertical surface and a first inclined surface; The first vertical surface is perpendicular to the bottom surface, and one end of the first vertical surface intersects with the inner edge of the bottom surface, and the first vertical surface is cylindrical; The first horizontal plane is perpendicular to the first vertical plane, and one end of the first horizontal plane intersects with an end of the first vertical plane away from the bottom plane, and the first horizontal plane is annular; The second vertical plane is perpendicular to the first horizontal plane, and one end of the second vertical plane intersects with an end of the first horizontal plane away from the first vertical plane, and the second vertical plane is cylindrical; the distance between the light emitting device and the second vertical plane is smaller than the distance between the light emitting device and the first vertical plane; The first inclined surface is concave in a cone shape in a direction away from the circuit board, and an end of the first inclined surface away from the vertex intersects with an end of the second vertical surface away from the first horizontal surface. In a direction perpendicular to the circuit board, the vertex of the first inclined surface corresponds to the geometric center of the light-emitting device.

12. The light emitting substrate according to claim 11, wherein: The outer surface of the lens includes a third vertical surface, a second inclined surface and a third inclined surface; The third vertical surface is perpendicular to the bottom surface, and one end of the third vertical surface intersects with the outer edge of the bottom surface, and the third vertical surface is cylindrical; The included angle between the second inclined surface and the third vertical surface is an obtuse angle, and the second inclined surface intersects with an end of the third vertical surface away from the bottom surface, and the orthographic projection of the end of the second inclined surface away from the third vertical surface on the circuit board is located at the periphery of the orthographic projection of the end of the second inclined surface intersecting with the third vertical surface on the circuit board; The third inclined surface is concave in a cone shape toward the direction approaching the circuit board, and an end of the third inclined surface away from the vertex intersects with the second inclined surface. The angle between the third inclined surface and the second inclined surface is an acute angle. In the direction perpendicular to the circuit board, the vertex of the third inclined surface corresponds to the vertex of the first inclined surface.

13. A backlight module, comprising: A light-emitting substrate, wherein the light-emitting substrate is the light-emitting substrate as claimed in claim 1; The optical component is arranged on one side of the light-emitting substrate, and the optical component is arranged on a side of the lens away from the circuit board.

14. The backlight module according to claim 13, wherein: The lens and the circuit board are sealed and connected via an adhesive layer.

15. The backlight module according to claim 13, wherein: The lens is spaced apart from the light emitting device, and a space enclosed by the lens, the light emitting device and the circuit board is kept in a vacuum state.

16. The backlight module according to claim 15, wherein: The vacuum degree in the interval space enclosed by the lens, the light emitting device and the circuit board is less than or equal to 500 Pa.

17. The backlight module according to claim 13, wherein: The optical component comprises a diffusion plate and an optical film. The diffusion plate is arranged on a side of the lens away from the circuit board, and the optical film is arranged on a side of the diffusion plate away from the lens.

18. A display device comprising: Display panel; A backlight module, wherein the backlight module is the backlight module according to claim 13; The backlight module is arranged on the non-light-emitting side of the display panel, and the optical components in the backlight module are arranged close to the display panel.

19. The display device according to claim 18, wherein: The lens and the circuit board are sealed and connected via an adhesive layer.

20. The display device according to claim 18, wherein: The lens is spaced apart from the light emitting device, and a space enclosed by the lens, the light emitting device and the circuit board is kept in a vacuum state.

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