Backlight module and display device

Abstract

The invention relates to a backlight module and a display device.The backlight module comprises a light-emitting device layer and a light control structure arranged on the light-emitting device layer, the light control structure comprises a first light control sub-layer and a second light control sub-layer, and the second light control sub-layer is located on the side, away from the light-emitting device layer, of the first light control sub-layer; the refractive index of the second sub light control layer is different from that of the first sub light control layer; wherein the first sub light control layer comprises a plurality of sub light control parts which are arranged at intervals, a plurality of grooves are formed in the side, facing the light emitting device layer, of the second sub light control layer, the sub light control parts are arranged in the grooves, and the sub light control parts are in one-to-one correspondence with the grooves; according to the backlight module, the light control structure is used for replacing a traditional multi-layer optical film layer stacking structure to achieve light control, the number of optical film layers is reduced, the structure is simplified, cost is reduced, and meanwhile the light emitting efficiency of the backlight module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a backlight module and a display device. BACKGROUND

[0002] Traditional direct type Mini Light Emitting Diode (Mini LED) backlight usually needs to be matched with multiple layers of optical films to meet the optical effect. However, the stacking of multiple layers of optical films not only has a complex structure and high cost, but also causes low backlight light efficiency. SUMMARY

[0003] The present application provides a backlight module and a display device, which can simplify the structure of the backlight module and improve the light efficiency of the backlight module.

[0004] The present application provides a backlight module, which comprises:

[0005] a driving substrate;

[0006] a light emitting device layer disposed on one side of the driving substrate, the light emitting device layer comprising a plurality of light emitting devices; and

[0007] a light control structure disposed on a side of the light emitting device layer away from the driving substrate, the light control structure comprising a first light control sub-layer and a second light control sub-layer, the second light control sub-layer being located on a side of the first light control sub-layer away from the light emitting device layer, the refractive index of the second light control sub-layer being different from the refractive index of the first light control sub-layer;

[0008] wherein the first light control sub-layer comprises a plurality of light control sub-parts arranged at intervals, and a normal projection of the light emitting device on the driving substrate is located within a normal projection range of the light control sub-parts on the driving substrate.

[0009] a plurality of grooves are arranged on a side of the second light control sub-layer facing the light emitting device layer, the light control sub-parts are arranged in the grooves, and the light control sub-parts correspond to the grooves one by one.

[0010] In some embodiments, the material of the first light control sub-layer is a first material, and the first material comprises a first organic material or a gas;

[0011] the material of the second light control sub-layer is a second material, and the second material comprises a second organic material;

[0012] wherein the refractive index of the first organic material is greater than the refractive index of the second organic material, or the refractive index of the first organic material is less than the refractive index of the second organic material.

[0013] In some embodiments, the second material further comprises diffusion particles dispersed in the second organic material.

[0014] In some embodiments, the light emitting device corresponds to the groove one-to-one, and an opening area of the groove is greater than a normal projection area of the light emitting device on the driving substrate.

[0015] In some embodiments, the backlight module comprises adjacent first and second regions, and the first region has the same brightness as the second region.

[0016] In some embodiments, the second region has a groove with an opening size greater than that of the first region.

[0017] In some embodiments, the second region has a light emitting device with a distribution density less than that of the first region.

[0018] In some embodiments, the second sub-light control layer further comprises a plurality of microstructures arranged on a side of the second sub-light control layer away from the first sub-light control layer.

[0019] In some embodiments, the microstructure comprises a convex lens or a prism.

[0020] The microstructure is a symmetric structure about a center plane, or an asymmetric structure, wherein the center plane is perpendicular to a light emitting surface of the light control structure.

[0021] In some embodiments, the second sub-light control layer further comprises a plurality of spacing grooves between adjacent sub-light control portions.

[0022] In some embodiments, the backlight module further comprises a light homogenizing layer arranged on a side of the light control structure away from the light emitting device layer.

[0023] The present application provides a display device comprising the backlight module as described above.

[0024] The backlight module provided by the application is provided with a light control structure on a light emitting device layer, the light control structure comprises a first light control sub-layer and a second light control sub-layer, the second light control sub-layer covers a side of the first light control sub-layer away from the light emitting device layer, the refractive index of the second light control sub-layer is different from the refractive index of the first light control sub-layer, wherein the first light control sub-layer comprises a plurality of light control sub-parts arranged at intervals, and the orthographic projection of the light emitting device on a driving substrate is located in the orthographic projection range of the light control sub-parts on the driving substrate, a plurality of grooves are arranged on the side of the second light control sub-layer facing the light emitting device layer, the light control sub-parts are arranged in the grooves, and the light control sub-parts correspond to the grooves one by one. The light control sub-parts are arranged on each light emitting device of the application correspondingly, the refractive index of the light control sub-parts is different from the refractive index of the second light control sub-layer, the emergent light of the light emitting device is refracted on the interface (i.e. the inner wall of the groove) between the light control sub-parts and the second light control sub-layer, the angle adjustment of the emergent light of the light emitting device can be realized, and the optical effects such as light diffusion or brightening can be realized; the light control structure is used to replace the traditional multilayer optical film layer stacking structure to realize light control, the number of optical film layers is reduced, the structure is simplified, the cost is reduced, and the light efficiency of the backlight module is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0026] In order to more completely understand the application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0027] Figure 1 is a structure schematic diagram of a backlight module provided by the prior art;

[0028] Figure 2 is a structure schematic diagram of a backlight module provided by an embodiment of the application;

[0029] Figure 3 is a partial light path schematic diagram of a backlight module provided by an embodiment of the application;

[0030] Figure 4 is a partial light path schematic diagram of another backlight module provided by an embodiment of the application;

[0031] Figure 5 is a structure schematic diagram of a backlight module provided by an embodiment of the application;

[0032] Figure 6is a top view of a backlight module according to an embodiment of the present application;

[0033] Figure 7 is a top view of another backlight module according to an embodiment of the present application;

[0034] Figure 8 is a structural view of a backlight module according to an embodiment of the present application;

[0035] Figure 9 is a structural view of a light control structure according to an embodiment of the present application;

[0036] Figure 10 is a structural view of a light control structure according to an embodiment of the present application;

[0037] Figure 11 is a structural view of a light control structure according to an embodiment of the present application;

[0038] Figure 12 is a structural view of a display device according to an embodiment of the present application.

[0039] Explanation of reference signs:

[0040] 10, display device; 100, backlight module; 101, reflecting cover; 102, diffusion plate; 103, diffusion film; 104, increment film; 105, brightness enhancement film; 110, driving substrate; 120, light emitting device layer; 121, light emitting device; 130, light control structure; 131, first sub light control layer; 132, second sub light control layer; 133, sub light control part; 134, first material; 135, second material; 136, groove; 137, microstructure; 138, interval groove; 139, inclined surface; 140, light uniformity layer; 150, back plate; 200, display panel. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0042] Please refer to Figure 1 , Figure 1is a structural schematic diagram of a backlight module provided by the prior art, the backlight module includes a driving substrate 110, a light emitting device layer 120, a reflecting cover 101, a diffusion plate 102, a diffusion film 103, an increment film 104, and a brightness enhancement film (Dual Brightness Enhancement Film, DBEF) 105, and the like, wherein the reflecting cover 101, the diffusion plate 102, the diffusion film 103, the increment film 104, and the brightness enhancement film 105 are stacked in sequence in a direction perpendicular to the driving substrate 110, for improving the optical effect of the backlight module, for example, the reflecting cover 101 is used for optical zoning to avoid color mixing, the diffusion plate 102 is used for solving the optical quality uniformity, the diffusion film 103 is used for improving the light uniformity, the increment film 104 is used for improving the backlight brightness, and the brightness enhancement film 105 is used for improving the light transmittance. However, the optical film layers of the existing backlight module are more, the structure is complex, the physical properties and the optical properties of different optical film layers are different, and precise design and layout are required when assembling them together, the optical matching is difficult, the process difficulty is high, and therefore the cost is high, at the same time, the more the optical film layers stacked above the light emitting device layer 120, the lower the overall light output efficiency of the backlight module, and finally the display effect of the display device is affected.

[0043] To solve the above problems, the present application provides a backlight module 100, please refer to Figure 2 , Figure 2 is a structural schematic diagram of a backlight module provided by an embodiment of the present application.

[0044] The backlight module 100 includes a driving substrate 110, a light emitting device layer 120, and a light control structure 130. The light emitting device layer 120 is arranged on one side of the driving substrate 110, and the light emitting device layer 120 includes a plurality of light emitting devices 121; the light control structure 130 is arranged on a side of the light emitting device layer 120 away from the driving substrate 110, and the light control structure 130 includes a first sub-light control layer 131 and a second sub-light control layer 132, the second sub-light control layer 132 is located on a side of the first sub-light control layer 131 away from the light emitting device layer 120, and the refractive index of the second sub-light control layer 132 is different from the refractive index of the first sub-light control layer 131; wherein the first sub-light control layer 131 includes a plurality of sub-light control portions 133 arranged at intervals, and the orthographic projection of the light emitting device 121 on the driving substrate 110 is located within the orthographic projection range of the sub-light control portion 133 on the driving substrate 110; a plurality of grooves 136 are arranged on a side of the second sub-light control layer 132 facing the light emitting device layer 120, the sub-light control portion 133 is arranged in the groove 136, and the sub-light control portion 133 corresponds to the groove 136 one by one.

[0045] In the present application, the driving substrate 110 includes a substrate and a circuit structure arranged on the substrate, and the driving substrate 110 is electrically connected with the light emitting device 121 to drive the light emitting device 121 to emit light.

[0046] In the present application, the light emitting device layer 120 includes a plurality of light emitting devices 121, which can be arranged in an array on the driving substrate 110. Specifically, the light emitting device 121 can be at least one of a light emitting diode (LED), a mini light emitting diode (Mini LED), or a micro light emitting diode (Micro LED), but is not limited thereto.

[0047] In the present application, the light control structure 130 is jointly constituted by the first sub-light control layer 131 and the second sub-light control layer 132, wherein the second sub-light control layer 132 is constituted by a plurality of sub-light control portions 133, which can be arranged in an array, and the sub-light control portion 133 has a one-to-one correspondence with the light emitting device 121, that is, one sub-light control portion 133 is arranged above one light emitting device 121. The second sub-light control layer 132 is provided with a plurality of grooves 136, and the sub-light control portion 133 has a one-to-one correspondence with the groove 136, and the sub-light control portion 133 is arranged in the groove 136. In this way, without increasing the thickness of the light control structure 130, the inner side wall of the groove 136 (i.e., the interface between the sub-light control portion 133 and the second sub-light control layer 132) can realize light expansion or light condensation of the emitted light of the light emitting device 121, which is beneficial to the thinning of the display panel.

[0048] In some embodiments, the material of the first sub-light control layer 131 is a first material 134, and the material of the second sub-light control layer 132 is a second material 135, and the refractive index of the first material 134 is different from the refractive index of the second material 135. For example, the refractive index of the first material 134 can be less than the refractive index of the second material 135, or the refractive index of the first material 134 can be greater than the refractive index of the second material 135. Because the refractive index of the first material 134 is different from the refractive index of the second material 135, when the light emitted by the light emitting device 121 enters the second material 135 through the first material 134, refraction will occur at the interface between the first material 134 and the second material 135, thereby increasing or reducing the angle of the emitted light of the light emitting device 121, so as to realize light expansion or light condensation and other light control effects.

[0049] In some embodiments, the first material 134 and the second material 135 can be organic materials. For example, the first material 134 can include a first organic material, and the second material 135 can include a second organic material, wherein the refractive index of the first organic material is greater than the refractive index of the second organic material, or the refractive index of the first organic material is less than the refractive index of the second organic material.

[0050] Please refer to Figure 3When the refractive index n1 of the first material 134 is greater than the refractive index n2 of the second material 135, i.e., the refractive index of the first organic material is greater than the refractive index of the second organic material, according to Snell's law n1*sinθ1=n2*sinθ2, when the light ray L1 emitted by the light-emitting device 121 enters the second material 135 from the first material 134, the refraction angle θ2 of the outgoing light ray L2 increases, and thus the outgoing angle θ of the outgoing light ray L2 decreases, i.e., the outgoing light ray L2 converges to the normal direction of the backlight module, achieving the light converging effect and improving the brightness of the backlight module.

[0051] Please refer to Figure 4 When the refractive index n1 of the first material 134 is less than the refractive index n2 of the second material 135, i.e., the refractive index of the first organic material is less than the refractive index of the second organic material, according to Snell's law n1*sinθ1=n2*sinθ2, when the light ray L1 emitted by the light-emitting device 121 enters the second material 135 from the first material 134, the refraction angle θ2 of the outgoing light ray L2 decreases, and thus the outgoing angle θ of the outgoing light ray L2 increases, achieving the light expanding effect and improving the coverage of the outgoing light ray of the light-emitting device 121.

[0052] In this embodiment, by adjusting the refractive index n1 of the first material 134 and the refractive index n2 of the second material 135, the outgoing angle θ of the outgoing light ray L2 of the light-emitting device 121 can be adjusted, and thus the light expanding or converging requirement can be achieved according to actual needs, so as to further improve the light uniformity or brightness of the backlight module 100 as a whole.

[0053] In some embodiments, please refer to Figure 2 and Figure 5 The first material 134 can be a gas, such as air, but is not limited thereto. Taking the first material 134 as air and the second material 135 as the second organic material as an example, wherein the refractive index n1 of the first material 134 is less than the refractive index n2 of the second material 135, i.e., the refractive index of the second organic material is greater than the refractive index of air, according to Snell's law n1*sinθ1=n2*sinθ2, when the light ray L1 emitted by the light-emitting device 121 enters the second material 135 from the first material 134, i.e., enters the second organic material from air, the refraction angle θ2 of the outgoing light ray L2 decreases, achieving the light expanding effect and improving the coverage of the outgoing light ray of the light-emitting device 121. In this embodiment, by adjusting the refractive index n2 of the second material 135, the outgoing angle θ of the outgoing light ray L2 of the light-emitting device 121 can be adjusted, and thus the light expanding or converging requirement can be achieved. The optical path diagram of this embodiment can be referred to Figure 3 .

[0054] In the present application, the first organic material and the second organic material can be at least one of a polyester organic compound such as polycarbonate, polymethyl methacrylate, polystyrene, etc., but are not limited thereto.

[0055] In some embodiments, the second material 135 further comprises diffusion particles dispersed in the second organic material. The diffusion particles have the effect of scattering light, enabling the second sub-light control layer 132 to further diffuse the light emitted by the light emitting device 121 to improve light uniformity.

[0056] The diffusion particles can be inorganic particles such as silica particles, titanium dioxide particles, etc., but are not limited thereto.

[0057] In the present application, the cooperation of the first sub-light control layer 131 and the second sub-light control layer 132 can adjust the emission angle of the light emitted by the light emitting device 121, while achieving uniform emission and brightness uniformity of the emitted light. Through one light control structure 130, the functions of multiple optical film layers can be achieved, the number of stacked optical film layers can be reduced, the structure of the backlight module 100 can be simplified, and the light extraction efficiency of the backlight module 100 can be improved.

[0058] In the present application, please refer to Figure 2 and Figure 5 The second sub-light control layer 132 is provided with a plurality of grooves 136 on the side facing the light emitting device layer 120, and the sub-light control portion 133 is arranged in the groove 136, and the sub-light control portion 133 corresponds to the groove 136 one by one. The second sub-light control layer 132 can be formed by injection molding to have the grooves 136, or by grooving or patterning to have the grooves 136, and the present application does not make specific limitations.

[0059] Please refer to Figure 2 When the first material 134 comprises a first organic material, the first organic material can be filled into the groove 136, and then the first organic material is solidified to form the sub-light control portion 133 in the groove 136. At this time, the sub-light control portion 133 is equivalent to a lens structure, which cooperates with the second sub-light control layer 132 to change the direction of the light emitted by the light emitting device 121.

[0060] Please refer to Figure 5When the first material 134 is air, the second sub-light control layer 132 can be inverted on the light emitting device 121 without filling the groove 136 with a material, and the first material 134 filled in the groove 136 is air. In this case, the inner side wall of the groove 136 corresponds to a lens surface, and the light emitted by the light emitting device 121 can change direction when passing through the lens surface. In this embodiment, because the first material 134 is air, the groove 136 of the second sub-light control layer 132 does not need to be filled with other materials after being formed, thereby saving material costs and simplifying the process while achieving the light control effect.

[0061] In some embodiments, referring to Figure 2 and Figure 5 , the light emitting device 121 corresponds to the groove 136 one-to-one, that is, one groove 136 is arranged above one light emitting device 121. The opening area of the groove 136 is greater than the orthographic projection area of the light emitting device 121 on the driving substrate 110, that is, the orthographic projection of the light emitting device 121 on the driving substrate 110 is located within the orthographic projection range of the corresponding groove 136 on the driving substrate 110, so that the light emitted by each light emitting device 121 can enter the corresponding sub-light control part 133, thereby improving the light utilization rate of the light emitting device 121.

[0062] In some embodiments, referring to Figure 2 , when the first material 134 is the first organic material, the sub-light control part 133 can be located directly above the light emitting device 121, and the edge of the sub-light control part 133 extends beyond the edge of the light emitting device 121. Referring to Figure 5 , when the first material 134 is air, the light emitting device 121 can be located in the space of the groove 136, for example, the side surface of the second sub-light control layer 132 close to the driving substrate 110 can be in contact with the upper surface of the driving substrate 110, thereby further improving the utilization rate of the light emitting device 121 at a large angle. In addition, by arranging the light emitting device 121 in the space of the groove 136, the crosstalk between adjacent light emitting devices 121 can be reduced.

[0063] In some embodiments, referring to Figures 2-4 , the groove 136 can be a regular or irregular structure, and the inner side wall of the groove 136 can include at least one of an inclined surface 139 or an arc surface, for example, the cross section of the groove 136 can be trapezoidal or semicircular, but is not limited thereto. The cross section refers to a planar pattern obtained by cutting the groove 136 with a plane perpendicular to the driving substrate 110.

[0064] Specifically, referring to Figure 4For example, the first material 134 includes a first organic material, the second material 135 includes a second organic material, the first material has a smaller refractive index than the second material, and the cross section of the groove 136 is trapezoidal. When the light ray L1 emitted by the light emitting device 121 enters the second material 135 from the first material 134, that is, when the light ray L1 passes through the inclined surface 139 of the trapezoid, the refraction angle θ2 of the outgoing light ray L2 decreases, and the outgoing angle θ of the outgoing light ray L2 increases. In this case, the light is expanded, and the coverage of the outgoing light ray of the light emitting device 121 is improved. Therefore, compared with the prior art, the number of light emitting devices 121 can be reduced by using the light control structure 130, the cost can be further reduced, and the process is simplified. In this embodiment, the slope angle α of the inclined surface 139 (α is the angle between the inclined surface 139 and the bottom surface of the second sub-light control layer 132) can be adjusted to adjust the size of the outgoing angle θ of the outgoing light ray L2 of the light emitting device 121, and then the direction of the outgoing light ray L2 of the light emitting device 121 is adjusted. For example, the smaller the slope angle α of the inclined surface 139, the larger the outgoing angle θ of the outgoing light ray L2, and the larger the coverage of the outgoing light ray of the light emitting device 121. Wherein, 0° < α < 90°.

[0065] Similarly, when the cross section of the groove 136 is semicircular, the refraction angle θ2 of the outgoing light ray L2 decreases when the light ray L1 passes through the arc surface of the semicircle, and the light is expanded, and the coverage of the outgoing light ray of the light emitting device 121 is improved. The curvature radius of the arc surface can be adjusted to adjust the size of the outgoing angle θ of the outgoing light ray L2 of the light emitting device 121, and then the direction of the outgoing light ray L2 of the light emitting device 121 is adjusted.

[0066] When the first material 134 is air and the second material 135 includes a second organic material, the principle is the same as that when the first material 134 includes a first organic material and the second material 135 includes a second organic material, which will not be repeated here.

[0067] Please refer to Figure 3 For example, the first material 134 includes a first organic material, the second material 135 includes a second organic material, the first material has a smaller refractive index than the second material, and the cross section of the groove 136 is trapezoidal. When the light ray L1 emitted by the light emitting device 121 enters the second material 135 from the first material 134, that is, when the light ray L1 passes through the inclined surface 139 of the trapezoid, the refraction angle θ2 of the outgoing light ray L2 decreases, and the outgoing angle θ of the outgoing light ray L2 increases. In this case, the light is expanded, and the coverage of the outgoing light ray of the light emitting device 121 is improved. Therefore, compared with the prior art, the number of light emitting devices 121 can be reduced by using the light control structure 130, the cost can be further reduced, and the process is simplified. In this embodiment, the slope angle α of the inclined surface 139 (α is the angle between the inclined surface 139 and the bottom surface of the second sub-light control layer 132) can be adjusted to adjust the size of the outgoing angle θ of the outgoing light ray L2 of the light emitting device 121, and then the direction of the outgoing light ray L2 of the light emitting device 121 is adjusted. For example, the smaller the slope angle α of the inclined surface 139, the larger the outgoing angle θ of the outgoing light ray L2, and the larger the coverage of the outgoing light ray of the light emitting device 121. Wherein, 0° < α < 90°.

[0068] In some embodiments, please refer to Figure 6In the structure of the backlight module 100, the plurality of light emitting devices 121 of the light emitting device layer 120 are uniformly distributed, i.e., the plurality of light emitting devices 121 can be arranged in an equidistant array, and the plurality of grooves 136 corresponding to the plurality of light emitting devices 121 are all of the same size, so as to ensure the uniformity of light emission and the consistency of brightness of the entire backlight module 100.

[0069] In some embodiments, referring to Figure 7 The backlight module 100 includes adjacent first area AA and second area AB, and the brightness of the first area AA is the same as that of the second area AB, wherein the first area AA can be a main display area located in the central region of the backlight module 100, and the second area AB can be a secondary display area located in the periphery of the main display area. The partitioned arrangement of the backlight module 100 can achieve the effect of partitioned display. The first area AA is the main image display area, and the requirement for display effect is relatively high. The second area AB is the auxiliary image display area, or the actual display time is less than that of the main display area, so the requirement for display effect is relatively low compared with that of the first area AA.

[0070] In the present embodiment, referring to Figures 7-8 The opening size of the groove 136 of the second area AB is greater than that of the first area AA, the distribution density of the light emitting device 121 of the second area AB is less than that of the first area AA, and the brightness of the first area AA is the same as that of the second area AB. The opening size refers to the diameter or width of the opening of the groove 136. For example, when the opening of the groove 136 is circular, the opening size refers to the diameter of the opening, and when the opening of the groove 136 is polygonal, the opening size refers to the diameter or width of the opening. In the present embodiment, by increasing the opening size of the groove of the second area AB, the coverage range of the light emitted by each light emitting device 121 of the second area AB can be expanded, so that the number of light emitting devices 121 of the second area AB can be reduced, i.e., the distance between adjacent light emitting devices 121 of the second area AB can be increased, the distribution density of the light emitting devices 121 of the second area AB can be reduced, and the use amount of the light emitting devices 121 of the second area AB can be reduced under the condition that the brightness of the second area AB is the same as that of the first area AA, thereby effectively reducing the cost.

[0071] In some embodiments, referring to Figures 9-11 The second light control layer 132 further includes a plurality of microstructures 137, the microstructures 137 are arranged on the side of the second light control layer 132 away from the first light control layer 131, and the plurality of microstructures 137 can be arranged in an array. The microstructures 137 can be convex lenses or prisms, but are not limited thereto. The microstructures 137 can be symmetric structures or asymmetric structures about the center plane O, wherein the center plane O is perpendicular to the light emitting surface of the light control structure 130.

[0072] Please refer toFigure 9 When the microstructure 137 is a convex lens, the microstructure 137 can achieve the function of uniform light, and can further improve the uniformity of light emitted from the second sub-light control layer 132.

[0073] Please refer to Figure 10 When the microstructure 137 is an asymmetric prism, the microstructure 137 can achieve the function of light angle deflection, and can adjust the angle of light emitted from the light emitting surface of the second sub-light control layer 132 relative to the first direction X perpendicular to the light emitting surface, to meet the different product requirements for different light emitting angles of the backlight module 100.

[0074] Please refer to Figure 11 When the microstructure 137 is a symmetric prism, the microstructure 137 can achieve the function of increment, that is, the function of the increment film 104, and can improve the brightness of the backlight module 100.

[0075] When the slope angle a of the inclined surface 139 is small, the microstructure 137 can be a symmetric prism. At this time, since the slope a of the inclined surface 139 of the sub-light control part 133 is smaller, the coverage range of the light emitted by the single light emitting device 121 is larger, and the number of light emitting devices 121 can be reduced. The microstructure 137 is a symmetric prism, which can achieve the effect of increment and improve the brightness of the backlight module 100. In this embodiment, the microstructure 137 cooperates with the slope a of the inclined surface 139 of the sub-light control part 133 to reduce the number of light emitting devices 121 under the condition of achieving the same backlight brightness effect, further reduce the cost, and simplify the process. Wherein, 10°≤a≤45°, for example, a can be 20°, 25°, 30°, 35°, 40°, 45°, etc., but is not limited to.

[0076] In some embodiments, please refer to Figure 2 The second sub-light control layer 132 further comprises a plurality of interval grooves 138, and the interval grooves 138 are located between adjacent sub-light control parts 133. Specifically, the interval grooves 138 are arranged around the sub-light control part 133, and the interval grooves 138 can be used for optical partitioning to separate different light emitting devices 121 to avoid problems such as light crosstalk and color crosstalk between adjacent light emitting devices 121.

[0077] In the present application, the light control structure 130 integrates the first sub light control layer 131 and the second sub light control layer 132, and the second sub light control layer 132 further integrates the groove 136 and the microstructure 137, so that the light control structure 130 of the present application can simultaneously realize the functions of multiple optical film layers, for example, the light control structure 130 can simultaneously contain the functions of multiple optical film layers such as reflector, diffusion plate, diffusion film, increment film, and brightness enhancement film DBEF, that is, the backlight module 100 of the present application uses a light control structure 130 to realize the optical effects of multiple stacked film layers such as reflector, diffusion plate, diffusion film, increment film, and brightness enhancement film in the prior art, avoiding the problems of difficult optical matching, high assembly process difficulty, and high cost of multiple optical film layers, and at the same time, due to the reduction in the number of stacked optical film layers, the influence on the light efficiency of the backlight module 100 is reduced, and the light efficiency of the backlight module 100 of the present application is effectively improved.

[0078] In some embodiments, please refer to Figure 2 The backlight module 100 further includes a light uniformization layer 140, which is arranged on the side of the light control structure 130 away from the light emitting device layer 120, to further improve the uniformity of the outgoing light of the backlight module 100 and further improve the light effect of the backlight module 100.

[0079] In some embodiments, please refer to Figure 2 The backlight module 100 further includes a back plate 150, which is arranged on the side of the driving substrate 110 away from the light emitting device layer 120, to provide support and protection for the driving substrate 110, the light emitting device layer 120, and the light control structure 130.

[0080] It should be noted that the backlight module 100 can further include other film layers or mechanisms commonly used in the backlight module in the art, and specific embodiments can refer to the prior art, which is not limited in the present application.

[0081] The present application further provides a display device 10, please refer to Figure 12 The display device 10 includes a display panel 200 and a backlight module 100 as described above, and the display panel 200 is arranged on the light emitting side of the backlight module 100, wherein the display panel 200 can be a liquid crystal display panel, but is not limited thereto.

[0082] In the present application, the display device 10 can be applied to vehicle display, computer, notebook, mobile phone, etc., but is not limited thereto.

[0083] The application provides a backlight module and a display device, the backlight module of the application is provided with a light control structure on a light emitting device layer, the light control structure comprises a first light control layer and a second light control layer, the second light control layer covers one side of the first light control layer away from the light emitting device layer, the refractive index of the second light control layer is different from the refractive index of the first light control layer, wherein the first light control layer comprises a plurality of light control sub-regions arranged at intervals, and the orthographic projection of the light emitting device on a driving substrate is located in the orthographic projection range of the light control sub-regions on the driving substrate, the side of the second light control layer facing the light emitting device layer is provided with a plurality of grooves, the light control sub-regions are arranged in the grooves, and the light control sub-regions correspond to the grooves one by one. The light control sub-regions are arranged on each light emitting device of the application, the refractive index of the light control sub-regions is different from the refractive index of the second light control layer, the emergent light of the light emitting device is refracted on the interface (i.e. the inner wall of the groove) between the light control sub-regions and the second light control layer, the angle adjustment of the emergent light of the light emitting device can be realized, and the optical effects such as light diffusion or brightening can be realized; the light control structure is used to replace the traditional multilayer optical film layer stacking structure to realize light control, the number of optical film layers is reduced, the structure is simplified, the cost is reduced, and the light efficiency of the backlight module is improved.

[0084] In the description of the application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0085] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0086] The embodiments, implementation manners and related technical features of the application can be combined or replaced with each other without conflict.

[0087] The above is only a preferred embodiment of the application, and does not limit the application in any form, but any simple modification, equivalent change and modification made on the basis of the technical essence of the application to the above embodiment, all still belong to the scope of the technical solution of the application.

Claims

1. A backlight module, characterized in that: include Driver substrate; a light emitting device layer, disposed on one side of the driving substrate, the light emitting device layer comprising a plurality of light emitting devices; as well as a light-control structure disposed on a side of the light-emitting device layer away from the driving substrate, the light-control structure comprising a first sub-light-control layer and a second sub-light-control layer, the second sub-light-control layer being located on a side of the first sub-light-control layer away from the light-emitting device layer, and having a refractive index different from that of the first sub-light-control layer; The first sub-light-control layer includes a plurality of sub-light-control parts that are spaced apart, and the orthographic projection of the light-emitting device on the driving substrate is within the orthographic projection range of the sub-light-control parts on the driving substrate; A plurality of grooves are provided on a side of the second sub-light-controlling layer facing the light-emitting device layer. The sub-light-controlling portions are provided in the grooves, and the sub-light-controlling portions correspond to the grooves one by one.

2. The backlight module according to claim 1, wherein: The material of the first sub-light-controlling layer is a first material, and the first material includes a first organic material or a gas; The material of the second sub-light-controlling layer is a second material, and the second material includes a second organic material; The refractive index of the first material is greater than the refractive index of the second material, or the refractive index of the first material is less than the refractive index of the second material.

3. The backlight module according to claim 2, wherein: The second material further includes diffusion particles, and the diffusion particles are dispersed in the second organic material.

4. The backlight module according to claim 1, wherein: The light emitting devices correspond to the grooves one by one, and an opening area of ​​the grooves is larger than an orthographic projection area of ​​the light emitting devices on the driving substrate.

5. The backlight module according to claim 1, wherein: The backlight module comprises a first area and a second area adjacent to each other, and the brightness of the first area is the same as the brightness of the second area; wherein the opening size of the groove in the second region is larger than the opening size of the groove in the first region; A distribution density of the light-emitting devices in the second region is smaller than a distribution density of the light-emitting devices in the first region.

6. The backlight module according to claim 1, wherein: The second light-controlling sub-layer further includes a plurality of microstructures, and the microstructures are arranged on a side of the second light-controlling sub-layer away from the first light-controlling sub-layer.

7. The backlight module according to claim 6, wherein: The microstructure includes a convex lens or a prism; The microstructure is a symmetrical structure or an asymmetrical structure with respect to its central plane, wherein the central plane is perpendicular to the light emitting surface of the light-controlling structure.

8. The backlight module according to claim 1, wherein: The second sub-light-controlling layer further includes a plurality of spacing grooves, and the spacing grooves are located between adjacent sub-light-controlling portions.

9. The backlight module according to any one of claims 1 to 8, characterized in that: The backlight module further includes a light uniforming layer, which is arranged on a side of the light-control structure away from the light-emitting device layer.

10. A display device, characterized in that: The backlight module comprises the backlight module according to any one of claims 1 to 9.

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