Backlight module and display device

Abstract

Disclosed in the present application are a backlight module and a display device. A light guide structure comprises a first light guide surface arranged opposite a first light-emitting member and a second light guide surface arranged opposite a second light-emitting member, wherein the first light guide surface is a mirror reflecting surface, and the second light guide surface is a diffuse reflecting surface. When the backlight module is configured to be in a first state, the first light-emitting member emits light, and the second light-emitting member does not emit light; and when the backlight module is configured to be in a second state, at least the second light-emitting member emits light.

Description

Backlight module and display device Technical Field

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

[0002] Displays are used in all aspects of daily life, and different applications require different viewing angles. For example, when users are in open environments where confidentiality is important, such as when entering a PIN for an ATM withdrawal, viewing private information on public transportation, or conducting business negotiations, a narrow viewing angle is required to prevent prying eyes and protect personal privacy. When users are in environments where sharing is necessary, such as when viewing a display device with others, a wider viewing angle is required to facilitate sharing.

[0003] Currently, dynamic privacy protection is often achieved by adding a privacy film to the display, such as a liquid crystal privacy film. However, the existing privacy film has a complex structure and greatly increases the cost of the display. SUMMARY OF THE INVENTION

[0004] The embodiments of the present application provide a backlight module and a display device, which can achieve dynamic privacy protection, simplify the structure of the backlight module, and reduce costs.

[0005] The present invention provides a backlight module, which includes:

[0006] a light guide plate, the light guide plate comprising a bottom surface away from the light emitting side of the backlight module and a first side surface and a second side surface connected to the bottom surface, the bottom surface being provided with a light guide structure;

[0007] A first light bar, comprising a first light-emitting element disposed on one side of the first side surface, wherein the light-emitting direction of the first light-emitting element is disposed toward the first side surface and emits light along a first direction;

[0008] a second light bar, comprising a second light-emitting element disposed on one side of the second side surface, wherein the light-emitting direction of the second light-emitting element is disposed toward the second side surface and emits light in a second direction, and the first direction is different from the second direction;

[0009] In which, the light-guiding structure includes a first light-guiding surface arranged opposite to the first light-emitting component, and a second light-guiding surface arranged opposite to the second light-emitting component, the first light-guiding surface is a mirror reflection surface, and the second light-guiding surface is a diffuse reflection surface, and the backlight module switches between a first state and a second state. When the backlight module is configured to the first state, the first light-emitting component emits light, and the second light-emitting component does not emit light. When the backlight module is configured to the second state, at least the second light-emitting component emits light.

[0010] According to the above-mentioned purpose of the present application, an embodiment of the present application further provides a display device, comprising a display panel and a backlight module, wherein the display panel is arranged on the light-emitting side of the backlight module;

[0011] The backlight module includes:

[0012] a light guide plate, the light guide plate comprising a bottom surface away from the light emitting side of the backlight module and a first side surface and a second side surface connected to the bottom surface, wherein the bottom surface is provided with a plurality of light guide structures;

[0013] A first light bar, comprising a first light-emitting element disposed on one side of the first side surface, wherein the light-emitting direction of the first light-emitting element is disposed toward the first side surface and emits light along a first direction;

[0014] a second light bar, comprising a second light-emitting element disposed on one side of the second side surface, wherein the light-emitting direction of the second light-emitting element is disposed toward the second side surface and emits light in a second direction, and the first direction is different from the second direction;

[0015] In which, the light-guiding structure includes a first light-guiding surface arranged opposite to the first light-emitting component, and a second light-guiding surface arranged opposite to the second light-emitting component, the first light-guiding surface is a mirror reflection surface, and the second light-guiding surface is a diffuse reflection surface, and the backlight module switches between a first state and a second state. When the backlight module is configured to the first state, the first light-emitting component emits light, and the second light-emitting component does not emit light. When the backlight module is configured to the second state, at least the second light-emitting component emits light. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of a planar structure of a backlight module provided in an embodiment of the present application;

[0017] FIG2 is a schematic diagram of a cross-sectional structure taken along line AA in FIG1 provided in an embodiment of the present application;

[0018] FIG3 is a schematic structural diagram of a light guide structure provided in an embodiment of the present application;

[0019] FIG4 is another schematic diagram of a planar structure of a backlight module provided in an embodiment of the present application;

[0020] FIG5 is a schematic diagram of a cross-sectional structure taken along line BB in FIG4 provided in an embodiment of the present application;

[0021] FIG6 is a schematic diagram of a cross-sectional structure taken along line CC in FIG4 provided in an embodiment of the present application;

[0022] FIG7 is a schematic diagram of another planar structure of a backlight module provided in an embodiment of the present application;

[0023] FIG8 is a schematic diagram of a cross-sectional structure taken along line DD in FIG7 provided in an embodiment of the present application;

[0024] FIG9 is a schematic diagram of a cross-sectional structure taken along line EE in FIG7 provided in an embodiment of the present application;

[0025] FIG10 is a schematic diagram of another planar structure of a backlight module provided in an embodiment of the present application;

[0026] FIG11 is a schematic diagram of a cross-sectional structure taken along line FF in FIG10 provided in an embodiment of the present application;

[0027] FIG12 is a schematic diagram of a cross-sectional structure taken along line GG in FIG10 provided in an embodiment of the present application;

[0028] FIG13 is a schematic structural diagram of a display device provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0029] 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.

[0030] The disclosure below provides many different embodiments or examples for realizing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate the application of other processes and / or the use of other materials.

[0031] An embodiment of the present application provides a backlight module. Referring to FIG. 1 and FIG. 2 , the backlight module includes a light guide plate 10 , a first light bar 21 , and a second light bar 22 .

[0032] The light guide plate 10 includes a bottom surface 100 away from the light emitting side of the backlight module and a first side surface 101 and a second side surface 102 connected to the bottom surface 100, and the bottom surface 100 is provided with a light guide structure 11; the first light bar 21 includes a first light-emitting component 211 arranged on one side of the first side surface 101, and the light emitting direction of the first light-emitting component 211 is arranged toward the first side surface 101 and emits light along the first direction X; the second light bar 22 includes a second light-emitting component 221 arranged on one side of the second side surface 102, and the light emitting direction of the second light-emitting component 221 is arranged toward the second side surface 102 and emits light along the second direction Y, and the first direction X is different from the second direction Y.

[0033] Among them, the light-guiding structure 11 includes a first light-guiding surface 111 arranged opposite to the first light-emitting component 211, and a second light-guiding surface 112 arranged opposite to the second light-emitting component 221. The first light-guiding surface 111 is a mirror reflection surface, and the second light-guiding surface 112 is a diffuse reflection surface. The backlight module switches between a first state and a second state. When the backlight module is configured in the first state, the first light-emitting component 211 emits light, and the second light-emitting component 221 does not emit light. When the backlight module is configured in the second state, at least the second light-emitting component 221 emits light.

[0034] During the implementation and application process, the embodiment of the present application designs the light guide structure 11 of the light guide plate 10 in the backlight module so that the first light guide surface 111 of the light guide structure 11 opposite to the first light emitting element 211 is a mirror reflection surface, so that the light emitted by the first light bar 21 is a small viewing angle light, and the second light guide surface 112 of the light guide structure 11 opposite to the second light emitting element 221 is a diffuse reflection surface, so that the light emitted by the second light bar 22 is a large viewing angle light, wherein, when the backlight module is configured in the first state, the first light emitting element 211 emits light, and the second light emitting element 221 does not emit light When the light of the first light-emitting component 211 passes through the first light-guiding surface 111 of the mirror reflection surface, it will produce light with a small viewing angle, thereby achieving an anti-peeping effect, so that the first state of the backlight module is an anti-peeping state; when the backlight module is configured to the second state, at least the second light-emitting component 221 emits light, so that when the light of the second light-emitting component 221 passes through the second light-guiding surface 112 of the diffuse reflection surface, it will produce light with a large viewing angle with a divergent angle, thereby achieving a sharing effect, thereby making the second state of the backlight module a shared state, so as to realize a dynamic anti-peeping function, simplify the structure of the backlight module, and reduce costs.

[0035] In an embodiment of the present application, an angle between the first light guiding surface and the first direction is smaller than an angle between the second light guiding surface and the second direction.

[0036] In one embodiment of the present application, an angle between the first light guiding surface and the first direction is greater than or equal to 15° and less than or equal to 30°.

[0037] In one embodiment of the present application, the first light guiding surface is a plane, and the second light guiding surface is an arc surface.

[0038] In an embodiment of the present application, the second light guiding surface protrudes toward a side away from the first light guiding surface.

[0039] In one embodiment of the present application, the light guide plate further includes a third side surface connected to the bottom surface, the backlight module further includes a third light bar, the third light bar includes a third light-emitting element arranged on one side of the third side surface, the light emitting direction of the third light-emitting element is arranged toward the third side surface and emits light along a third direction, and the third direction is different from both the first direction and the second direction;

[0040] The light guide structure includes a third light guide surface arranged opposite to the third light emitting element. The third light guide surface is a mirror reflection surface. The third light emitting element emits light at least when the backlight module is configured in the first state.

[0041] In one embodiment of the present application, the third direction is opposite to the first direction.

[0042] In one embodiment of the present application, the light guide plate further includes a fourth side surface connected to the bottom surface, the backlight module further includes a fourth light bar, the fourth light bar includes a fourth light-emitting element disposed on one side of the fourth side surface, the light emitting direction of the fourth light-emitting element is disposed toward the fourth side surface and emits light along a fourth direction, and the fourth direction is different from both the first direction and the second direction;

[0043] The light-guiding structure includes a fourth light-guiding surface arranged opposite to the fourth light-emitting component, and the fourth light-guiding surface is a diffuse reflection surface. When the backlight module is configured in the first state, the fourth light-emitting component does not emit light. When the backlight module is configured in the second state, the fourth light-emitting component emits light.

[0044] In an embodiment of the present application, the fourth direction intersects with the second direction, or the fourth direction is opposite to the second direction.

[0045] In one embodiment of the present application, the first light bar includes a first circuit board, the first light-emitting element is disposed on the first circuit board, the first circuit board is located on a side of the light guide plate provided with the bottom surface, one end of the first circuit board is connected to the first light-emitting element, and the other end of the first circuit board overlaps with the light guide plate along a thickness direction of the light guide plate;

[0046] The second light strip includes a second circuit board, the second light-emitting component is arranged on the second circuit board, the second circuit board is located on the side of the light guide plate where the bottom surface is provided, one end of the second circuit board is connected to the second light-emitting component, and the other end of the second circuit board overlaps with the light guide plate along the thickness direction of the light guide plate.

[0047] In one embodiment of the present application, a first reflective layer is provided on a surface of the first circuit board opposite to the light guide plate, and a second reflective layer is provided on a surface of the second circuit board opposite to the light guide plate.

[0048] Specifically, please continue to combine Figures 1 and 2. The backlight module provided in the embodiment of the present application includes a light guide plate 10, and the light guide plate 10 includes a bottom surface 100 away from the light-emitting side of the backlight module and a first side surface 101 and a second side surface 102 connected to the bottom surface 100. For example, when the light guide plate 10 is a rectangular parallelepiped, the light guide plate 10 has four side surfaces 102, as shown in Figure 1.

[0049] The backlight module also includes a plurality of light strips arranged on the side of the light guide plate 10. Specifically, the backlight module includes a first light strip 21 and a second light strip 22 arranged on the peripheral side of the light guide plate 10. The first light strip 21 includes a first light-emitting component 211 arranged on the side of the first side 101 of the light guide plate 10. The first light-emitting component 211 emits light toward the first side 101, and the first light-emitting component 211 emits light along the first direction X. The second light strip 22 includes a second light-emitting component 221 arranged on the side of the second side 102 of the light guide plate 10. The second light-emitting component 221 emits light toward the second side 102, and the second light-emitting component 221 emits light along the second direction Y.

[0050] The first direction X and the second direction Y are different, that is, the first light-emitting element 211 and the second light-emitting element 221 are located on different sides of the light guide plate 10. For example, the first direction X may intersect with the second direction Y, or the first direction X may be opposite to the second direction Y.

[0051] In one embodiment, when the first direction X intersects the second direction Y, the first direction X may be perpendicular to the second direction Y.

[0052] It should be noted that the first light bar 21 may include a plurality of first light-emitting elements 211, and the first light-emitting elements 211 may be LED light elements arranged on the first light bar 21, and the plurality of first light-emitting elements 211 may be arranged in a direction parallel to the first side surface 101 of the light guide plate 10; similarly, the second light bar 22 may include a plurality of second light-emitting elements 221, and the second light-emitting elements 221 may be LED light elements arranged on the second light bar 22, and the plurality of second light-emitting elements 221 may be arranged in a direction parallel to the second side surface 102 of the light guide plate 10.

[0053] In one embodiment, the first light bar 21 includes a first circuit board 212, and the first light-emitting element 211 is located on the first side surface 101 of the light guide plate 10, the first circuit board 212 is located on the side of the light guide plate 10 close to the bottom surface 100, the first light-emitting element 211 is arranged on the first circuit board 212, and one end of the first circuit board 212 is connected to the first light-emitting element 211, and the other end of the first circuit board 212 overlaps with the light guide plate 10 along the thickness direction of the light guide plate 10; further, the second light bar 22 includes a second circuit board 222, and the second light-emitting element 221 is located on the second side surface 102 of the light guide plate 10, the second circuit board 222 is located on the side of the light guide plate 10 close to the bottom surface 100, the second light-emitting element 221 is arranged on the second circuit board 222, and one end of the second circuit board 222 is connected to the second light-emitting element 221, and the other end of the second circuit board 222 overlaps with the light guide plate 10 along the thickness direction of the light guide plate 10.

[0054] In addition, in order to prevent the overlapping parts of the first circuit board 212 and the second circuit board 222 with the light guide plate 10 from affecting the light output of the backlight module, the embodiment of the present application sets a first reflective layer 213 on the side of the first circuit board 212 close to the light guide plate 10, and sets a second reflective layer 223 on the side of the second circuit board 222 close to the light guide plate 10, wherein the first reflective layer 213 is set on the surface of the first circuit board 212 opposite to the light guide plate 10, and the second reflective layer 223 is set on the surface of the second circuit board 222 opposite to the light guide plate 10; thereby, the light emitted by the first light-emitting element 211 and the second light-emitting element 221 to the bottom surface 100 of the light guide plate 10 can be reflected to improve the light output efficiency of the backlight module.

[0055] In one embodiment, the backlight module further includes a reflective sheet arranged on the side of the light guide plate 10 with the bottom surface 100, a diffusion sheet and a prism sheet arranged on the light guide plate 10 close to the light output side of the backlight module to further improve the light output effect of the backlight module.

[0056] In the embodiment of the present application, a light guide structure 11 is provided on the bottom surface 100 of the light guide plate 10 to adjust the light emitted by the first light emitting element 211 and the second light emitting element 221 so that the light is emitted along a preset direction.

[0057] The light-guiding structure 11 includes a first light-guiding surface 111 arranged opposite to the first light-emitting component 211, and a second light-guiding surface 112 arranged opposite to the second light-emitting component 221, and the first light-guiding surface 111 is a mirror reflection surface, so that the light output of the first light-emitting component 211 is collimated light output, and the second light-guiding surface 112 is a diffuse reflection surface, so that the light output of the second light-emitting component 221 is divergent light output.

[0058] It can be understood that the first light guiding surface 111 is the side of the light guiding structure 11 facing the first light emitting element 211 , and the second light guiding surface 112 is the side of the light guiding structure 11 facing the second light emitting element 221 .

[0059] Furthermore, the backlight module includes a first state and a second state. When the backlight module is configured in the first state, the first light-emitting element 211 emits light, and the second light-emitting element 221 does not emit light, so that the backlight module emits light in a collimated manner in the first state. When the backlight module is configured in the second state, at least the second light-emitting element 221 emits light, so that the backlight module emits light in a divergent manner in the second state. The present application designs the light guide structure 11 of the light guide plate 10 in the backlight module so that the first light guide surface 111 opposite to the first light-emitting element 211 is a mirror reflection surface, so that the light emitted by the first light bar 21 is light emitted at a small viewing angle, and the light guide The second light-guiding surface 112 of the structure 11 opposite to the second light-emitting component 221 is a diffuse reflection surface, so that the light emitted by the second light strip 22 is a wide-angle light-emitting light, wherein, when the backlight module is configured to the first state, the first light-emitting component 211 emits light, and the second light-emitting component 221 does not emit light, and when the backlight module is configured to the second state, at least the second light-emitting component 221 emits light, thereby making the first state of the backlight module an anti-peeping state, and the second state a shared state, and the light-emitting angle range of the backlight module in the first state is smaller than the light-emitting angle range of the backlight module in the second state, so as to realize the dynamic anti-peeping function, simplify the structure of the backlight module, and reduce the cost.

[0060] In one embodiment, as shown in FIG3 , the angle a between the first light-guiding surface 111 and the first direction X is smaller than the angle b between the second light-guiding surface 112 and the second direction Y, so that the light emitted by the first light-emitting element 211 can be emitted in a forward direction after being guided by the first light-guiding surface 111, and preferably, when the backlight module is configured in the first state, the light emitting direction of the backlight module is in the forward direction.

[0061] In one embodiment, the angle between the first light guiding surface 111 and the first direction X is greater than or equal to 15° and less than or equal to 30°.

[0062] It should be noted that the bottom surface 100 of the light guide plate 10 is provided with a plurality of light guide structures 11, and the plurality of light guide structures 11 can be arranged in an array of multiple rows and columns, or, in other embodiments of the present application, the plurality of light guide structures 11 can also be arranged differently according to the brightness distribution of different areas, which is not limited here.

[0063] In one embodiment of the present application, please continue to combine Figures 1 and 2. In this embodiment, the first direction X is opposite to the second direction Y, that is, the first light-emitting component 211 and the second light-emitting component 221 are respectively located on two opposite sides of the light guide plate 10 and emit light towards each other.

[0064] Among them, the first light-guiding surface 111 and the second light-guiding surface 112 of the light-guiding structure 11 are respectively located on opposite sides of the light-guiding structure 11 to respectively guide light to the first light-emitting component 211 and the second light-emitting component 221. Then, when the backlight module is configured to the first state, the first light-emitting component 211 can be turned on and the second light-emitting component 221 can be turned off to achieve a small-angle light emission of the backlight module and realize an anti-peeping function; when the backlight module is configured to the second state, the second light-emitting component 221 can be turned on and the first light-emitting component 211 can be turned off, or the second light-emitting component 221 and the first light-emitting component 211 can be turned on to achieve a large-angle light emission of the backlight module and realize a sharing function.

[0065] In another embodiment of the present application, please refer to Figures 4, 5 and 6. In this embodiment, the light guide plate 10 also includes a third side surface 103 connected to the bottom surface 100, the backlight module also includes a third light bar 23, and the third light bar 23 includes a third light-emitting component 231 arranged on one side of the third side surface 103. The light emitting direction of the third light-emitting component 231 is toward the third side surface 103, and the third light-emitting component 231 emits light along a third direction M, wherein the third direction M is different from the first direction X and the second direction Y.

[0066] The third light bar 23 also includes a third circuit board 232, and the third light-emitting element 231 is arranged on the third circuit board 232, and the third circuit board 232 is located on the side of the light guide plate 10 with the bottom surface 100. One end of the third circuit board 232 is connected to the third light-emitting element 231, and the other end of the third circuit board 232 overlaps with the light guide plate 10 along the thickness direction of the light guide plate 10; in order to prevent the overlapping part of the third circuit board 232 and the light guide plate 10 from affecting the light output of the backlight module, the embodiment of the present application provides a third reflective layer 233 on the side of the third circuit board 232 close to the light guide plate 10, wherein the third reflective layer 233 is provided on the surface of the third circuit board 232 opposite to the light guide plate 10; thereby, the light emitted by the first light-emitting element 211, the second light-emitting element 221 and the third light-emitting element 231 to the bottom surface 100 of the light guide plate 10 can be reflected to improve the light output efficiency of the backlight module.

[0067] Optionally, the third direction M may intersect with the first direction X, or the third direction M may be opposite to the first direction X. In this embodiment, the third direction M is opposite to the first direction X as an example, that is, the first side surface 101 and the third side surface 103 are two opposite side surfaces of the light guide plate 10, and the second side surface 102 is connected between the first side surface 101 and the third side surface 103.

[0068] The third light emitting element 231 and the first light emitting element 211 are located on two opposite sides of the light guide plate 10 and emit light towards each other. The second direction Y intersects with the first direction X and the third direction M.

[0069] In this embodiment, the light-guiding structure 11 includes a third light-guiding surface 113 arranged opposite to the third light-emitting element 231, and the third light-guiding surface 113 is a side of the light-guiding structure 11 facing the third light-emitting element 231. The third light-guiding surface 113 is a mirror reflection surface, so that the light emitted by the third light-emitting element 231 can be emitted in a forward direction after being guided by the third light-guiding surface 113. Preferably, when the backlight module is configured in the first state, the light-emitting direction of the backlight module is in the forward direction.

[0070] It should be noted that since the light guide structure 11 can be patterned on the bottom surface 100 of the light guide plate 10 using a laser or a tool, when the first light guide surface 111 and the third light guide surface 113 are the same surface, the first light guide surface 111 and the third light guide surface 113 are located on opposite sides of the light guide structure 11, which can reduce the processing difficulty of the light guide structure 11 and simplify the manufacturing process of the light guide plate 10.

[0071] In one embodiment, the depth of the light-guiding structure 11 may be greater than or equal to 5 microns and less than or equal to 15 microns, for example, it may be 5 microns, 6 microns, 7 microns, 8 microns, 9 microns, 10 microns, 11 microns, 12 microns, 13 microns, 14 microns, or 15 microns. The bottom width of the light-guiding structure 11 away from the light-emitting side of the backlight module may be greater than or equal to 30 microns and less than or equal to 70 microns, for example, it may be 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, 55 microns, 60 microns, 65 microns, or 70 microns. The above values ​​are for illustration only and are not limited to this.

[0072] In one embodiment, the angle between the third light guiding surface 113 and the third direction M is greater than or equal to 15° and less than or equal to 30°, for example, it can be 15°, 20°, 25°, or 30°, and the above values ​​are only for illustration and are not limited thereto.

[0073] Furthermore, the second direction Y may be perpendicular to the first direction X and the third direction M.

[0074] It can be understood that the light-guiding structure 11 can have four surfaces, and three of the surfaces are the first light-guiding surface 111, the second light-guiding surface 112 and the third light-guiding surface 113, and the remaining surface is arranged opposite to the second light-guiding surface 112, and the remaining surface can be a diffuse reflection surface to reduce the difficulty of the manufacturing process of the light-guiding structure 11.

[0075] Continuing from the above, the embodiment of the present application designs the light guide structure 11 of the light guide plate 10 in the backlight module so that the first light guide surface 111 of the light guide structure 11 opposite to the first light-emitting element 211 is a mirror reflection surface, so that the light emitted by the first light bar 21 is a small-angle light emission, and the second light guide surface 112 of the light guide structure 11 opposite to the second light-emitting element 221 is a diffuse reflection surface, so that the light emitted by the second light bar 22 is a large-angle light emission, wherein, when the backlight module is configured to the first state, the first light-emitting element 211 and the third light-emitting element 231 emit light, and the second light-emitting element 221 does not emit light, and when the backlight module is configured to the second state, the second light-emitting element 221 emits light, or the first light-emitting element 211, the second light-emitting element 221 and the third light-emitting element 231 all emit light, thereby making the first state of the backlight module an anti-peeping state and the second state a shared state, so as to realize the dynamic anti-peeping function, simplify the structure of the backlight module, and reduce the cost.

[0076] In another embodiment of the present application, please refer to Figures 7, 8 and 9. The difference between this embodiment and the embodiment shown in Figure 5 is that: the light guide plate 10 also includes a fourth side surface 104 connected to the bottom surface 100, and the backlight module also includes a fourth light bar 24. The fourth light bar 24 includes a fourth light-emitting component 241 arranged on one side of the fourth side surface 104. The light-emitting direction of the fourth light-emitting component 241 is arranged toward the fourth side surface 104 and emits light along a fourth direction N, and the fourth direction N is different from the first direction X and the second direction Y.

[0077] The fourth direction N is opposite to the second direction Y, that is, the fourth light emitting element 241 and the second light emitting element 221 are located on opposite sides of the light guide plate 10 , and emit light towards each other.

[0078] The light-guiding structure 11 includes a fourth light-guiding surface 114 arranged opposite to the fourth light-emitting component 241. The fourth light-guiding surface 114 is a side of the light-guiding structure 11 facing the fourth light-emitting component 241. The fourth light-guiding surface 114 is a diffuse reflection surface. When the backlight module is configured in the first state, the fourth light-emitting component 241 does not emit light. When the backlight module is configured in the second state, the fourth light-emitting component 241 emits light.

[0079] The fourth light bar 24 also includes a fourth circuit board 242, and the fourth light-emitting element 241 is arranged on the fourth circuit board 242, and the fourth circuit board 242 is located on the side of the light guide plate 10 provided with the bottom surface 100, one end of the fourth circuit board 242 is connected to the fourth light-emitting element 241, and the other end of the fourth circuit board 242 overlaps with the light guide plate 10 along the thickness direction of the light guide plate 10; in order to prevent the overlapping part of the fourth circuit board 242 and the light guide plate 10 from affecting the light output of the backlight module, the embodiment of the present application provides a fourth reflective layer 243 on the side of the fourth circuit board 242 close to the light guide plate 10, wherein the fourth reflective layer 243 is provided on the surface of the fourth circuit board 242 opposite to the light guide plate 10; thereby, the light emitted by the first light-emitting element 211, the second light-emitting element 221, the third light-emitting element 231 and the fourth light-emitting element 241 to the bottom surface 100 of the light guide plate 10 can be reflected to improve the light output efficiency of the backlight module.

[0080] Continuing from the above, the embodiment of the present application designs the light guide structure 11 of the light guide plate 10 in the backlight module so that the first light guide surface 111 of the light guide structure 11 opposite to the first light-emitting element 211 is a mirror reflection surface, so that the light emitted by the first light bar 21 is light with a small viewing angle, and the second light guide surface 112 of the light guide structure 11 opposite to the second light-emitting element 221 is a diffuse reflection surface, so that the light emitted by the second light bar 22 is light with a large viewing angle. When the backlight module is configured in the first state, the first light-emitting element 211 and the third light-emitting element 231 emit light, and the second light-emitting element 221 does not emit light. When the backlight module is configured in the second state, the second light-emitting element 221 and the fourth light-emitting element 241 emit light, or the first light-emitting element 211, the second light-emitting element 221, the third light-emitting element 231 and the fourth light-emitting element 241 all emit light, thereby making the first state of the backlight module an anti-peeping state and the second state a shared state, so as to realize the dynamic anti-peeping function, simplify the structure of the backlight module, and reduce the cost.

[0081] In another embodiment of the present application, please refer to Figures 10, 11 and 12. The difference between this embodiment and the embodiment shown in Figure 1 is that the light guide plate 10 also includes a fourth side surface 104 connected to the bottom surface 100 and a fifth side surface 105 connected to the bottom surface 100, and the backlight module also includes a fourth light bar 24 and a fifth light bar 25.

[0082] Specifically, the fourth light strip 24 includes a fourth light-emitting component 241 arranged on one side of the fourth side surface 104. The light-emitting direction of the fourth light-emitting component 241 is set toward the fourth side surface 104 and emits light along a fourth direction N, and the fourth direction N is different from the first direction X and the second direction Y; wherein, the fourth direction N intersects with the second direction Y.

[0083] The light guide structure 11 includes a fourth light guide surface 114 arranged opposite to the fourth light emitting element 241. The fourth light guide surface 114 is a diffuse reflection surface. When the backlight module is configured in the first state, the fourth light emitting element 241 does not emit light. When the backlight module is configured in the second state, the fourth light emitting element 241 emits light.

[0084] The fifth light strip 25 includes a fifth light-emitting component 251 arranged on one side of the fifth side surface 105. The light-emitting direction of the fifth light-emitting component 251 is set toward the fifth side surface 105 and emits light along the fifth direction P, and the fifth direction P is different from the first direction X and the second direction Y; wherein, the fifth direction P is opposite to the fourth direction N, that is, the fourth light-emitting component 241 and the fifth light-emitting component 251 are respectively arranged on two opposite sides of the light guide plate 10, and the fourth light-emitting component 241 and the fifth light-emitting component 251 emit light towards each other.

[0085] The light-guiding structure 11 includes a fifth light-guiding surface 115 arranged opposite to the fifth light-emitting element 251. The fifth light-guiding surface 115 is a side of the light-guiding structure 11 facing the fifth light-emitting element 251. The fifth light-guiding surface 115 is a diffuse reflection surface. When the backlight module is configured in the first state, the fifth light-emitting element 251 does not emit light. When the backlight module is configured in the second state, the fifth light-emitting element 251 emits light.

[0086] In this embodiment, the first side surface 101 and the second side surface 102 are two opposite side surfaces of the light guide plate 10 , and the fourth side surface 104 and the fifth side surface 105 are two opposite side surfaces of the light guide plate 10 .

[0087] Furthermore, the fourth light bar 24 also includes a fourth circuit board 242, and the fourth light-emitting element 241 is arranged on the fourth circuit board 242, and the fourth circuit board 242 is located on the side of the light guide plate 10 provided with the bottom surface 100, one end of the fourth circuit board 242 is connected to the fourth light-emitting element 241, and the other end of the fourth circuit board 242 overlaps with the light guide plate 10 along the thickness direction of the light guide plate 10; in order to prevent the overlapping part of the fourth circuit board 242 and the light guide plate 10 from affecting the light output of the backlight module, the embodiment of the present application provides a fourth reflective layer 243 on the side of the fourth circuit board 242 close to the light guide plate 10, wherein the fourth reflective layer 243 is provided on the surface of the fourth circuit board 242 opposite to the light guide plate 10; thereby, the light emitted by the first light-emitting element 211, the second light-emitting element 221, the fourth light-emitting element 241 and the fifth light-emitting element 251 to the bottom surface 100 of the light guide plate 10 can be reflected to improve the light output efficiency of the backlight module.

[0088] The fifth light bar 25 also includes a fifth circuit board 252, and the fifth light-emitting element 251 is arranged on the fifth circuit board 252, and the fifth circuit board 252 is located on the side of the light guide plate 10 with a bottom surface 100, one end of the fifth circuit board 252 is connected to the fifth light-emitting element 251, and the other end of the fifth circuit board 252 overlaps with the light guide plate 10 along the thickness direction of the light guide plate 10; in order to prevent the overlapping part of the fifth circuit board 252 and the light guide plate 10 from affecting the light output of the backlight module, the embodiment of the present application provides a fifth reflective layer 253 on the side of the fifth circuit board 252 close to the light guide plate 10, wherein the fifth reflective layer 253 is provided on the surface of the fifth circuit board 252 opposite to the light guide plate 10; thereby, the light emitted by the first light-emitting element 211, the second light-emitting element 221, the fourth light-emitting element 241 and the fifth light-emitting element 251 to the bottom surface 100 of the light guide plate 10 can be reflected to improve the light output efficiency of the backlight module.

[0089] As mentioned above, the embodiment of the present application designs the light guide structure 11 of the light guide plate 10 in the backlight module so that the first light guide surface 111 of the light guide structure 11 opposite to the first light emitting element 211 is a mirror reflection surface, so that the light emitted by the first light bar 21 is a small viewing angle light, and the second light guide surface 112 of the light guide structure 11 opposite to the second light emitting element 221 is a diffuse reflection surface, so that the light emitted by the second light bar 22 is a wide viewing angle light, wherein, when the backlight module is configured in the first state, the first light emitting element 211 emits light, and the second light emitting element 221 emits light. The light element 221, the fourth light element 241 and the fifth light element 251 do not emit light. When the backlight module is configured to the second state, the second light element 221, the fourth light element 241 and the fifth light element 251 emit light, or the first light element 211, the second light element 221, the fourth light element 241 and the fifth light element 251 all emit light, thereby making the first state of the backlight module an anti-peeping state and the second state a shared state, so as to realize the dynamic anti-peeping function, simplify the structure of the backlight module, and reduce the cost.

[0090] It can be understood that the first light-guiding surface 111 and the third light-guiding surface 113 described in the above embodiments are smooth planes that can perform mirror reflection, and the second light-guiding surface 112, the fourth light-guiding surface 114 and the fifth light-guiding surface 115 are arc-shaped rough surfaces that can perform diffuse reflection, and the second light-guiding surface 112 protrudes toward the side away from the first light-guiding surface 111. In addition, the fourth light-guiding surface 114 and the fifth light-guiding surface 115 both protrude toward the side away from the center of the light-guiding structure 11, so that the light emitted by the second light-emitting element 221, the fourth light-emitting element 241 and the fifth light-emitting element 251 can be better dispersed and dispersed to a larger viewing angle range, thereby improving the viewing angle range and light-emitting effect of the backlight module in the second state.

[0091] It should be noted that, in the embodiment of the present application, the top view shape of the light guide plate 10 is a quadrilateral for explanation, and the light guide plate 10 can also be set as other polygons, so that each light-emitting component is located on the side of the light guide plate 10 and emits light in the direction close to the light guide plate 10, and the light-guiding structure 11 in the light guide plate 10 forms a light-guiding surface relative to one side of each light-emitting component, and at least one mirror reflection surface and one diffuse reflection surface need to be formed. The mirror reflection surface can make the light emitted by the light-emitting component be collimated to achieve small viewing angle light emission, and the diffuse reflection surface can make the light emitted by the light-emitting component be divergent to achieve large viewing angle light emission, thereby enabling the backlight module to switch between the anti-peeping state and the shared state.

[0092] In one embodiment of the present application, the light guide structure 11 is uniformly distributed in the light guide plate 10; in other embodiments of the present application, the backlight module includes a first area and a second area, and since the original brightness of the first area is lower than that of the second area, in the embodiment of the present application, the distribution density of the light guide structure 11 in the first area is set to be greater than the distribution density of the light guide structure 11 in the second area, so that the average brightness of the improved first area is equal to the average brightness of the second area, thereby improving the problem of uneven brightness distribution in the backlight module; for example, the first area can be the surrounding areas of the backlight module, and the second area can be the middle area of ​​the backlight module, and the surrounding areas may be blocked by the frame, resulting in light loss and reduced brightness, and the embodiment of the present application can improve the brightness uniformity of the backlight module; in addition, the first area and the second area can also be other areas with uneven brightness distribution in the backlight module, which are not limited here.

[0093] In addition, an embodiment of the present application further provides a display device. Referring to FIG. 1 and FIG. 13 , the display device includes a display panel 40 and the backlight module 30 as described in the above embodiment, and the display panel 40 is disposed on the light-emitting side of the backlight module 30 .

[0094] Among them, when the backlight module 30 is configured to the first state, it can realize light emission at a small viewing angle, and the display device can realize an anti-peeping mode. When the backlight module 30 is configured to the second state, it can realize light emission at a large viewing angle, and the display device can realize a sharing mode. Therefore, in the embodiment of the present application, by controlling the opening and closing of the light-emitting parts on the side of the light guide plate 10, the function of switching the display device between the anti-peeping mode and the sharing mode can be realized, and there is no need to add additional anti-peeping films and other structures, thereby simplifying the process and reducing costs.

[0095] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0096] The above is a detailed introduction to a backlight module and a 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 only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A backlight module, comprising: a light guide plate, the light guide plate comprising a bottom surface away from the light emitting side of the backlight module and a first side surface and a second side surface connected to the bottom surface, wherein the bottom surface is provided with a plurality of light guide structures; A first light bar, comprising a first light-emitting element disposed on one side of the first side surface, wherein the light-emitting direction of the first light-emitting element is disposed toward the first side surface and emits light along a first direction; a second light bar, comprising a second light-emitting element disposed on one side of the second side surface, wherein the light-emitting direction of the second light-emitting element is disposed toward the second side surface and emits light along a second direction, and the first direction is different from the second direction; In which, the light-guiding structure includes a first light-guiding surface arranged opposite to the first light-emitting component, and a second light-guiding surface arranged opposite to the second light-emitting component, the first light-guiding surface is a mirror reflection surface, and the second light-guiding surface is a diffuse reflection surface, and the backlight module switches between a first state and a second state. When the backlight module is configured to the first state, the first light-emitting component emits light, and the second light-emitting component does not emit light. When the backlight module is configured to the second state, at least the second light-emitting component emits light.

2. The backlight module according to claim 1, wherein: An included angle between the first light guiding surface and the first direction is smaller than an included angle between the second light guiding surface and the second direction.

3. The backlight module according to claim 1, wherein: An included angle between the first light guiding surface and the first direction is greater than or equal to 15° and less than or equal to 30°.

4. The backlight module according to claim 1, wherein: The first light guiding surface is a plane, and the second light guiding surface is an arc surface.

5. The backlight module according to claim 4, wherein: The second light guiding surface protrudes toward a side away from the first light guiding surface.

6. The backlight module according to claim 1, wherein: The light guide plate further includes a third side surface connected to the bottom surface, the backlight module further includes a third light bar, the third light bar includes a third light emitting element arranged on one side of the third side surface, the light emitting direction of the third light emitting element is arranged toward the third side surface and emits light along a third direction, and the third direction is different from both the first direction and the second direction; The light guide structure includes a third light guide surface arranged opposite to the third light emitting element. The third light guide surface is a mirror reflection surface. The third light emitting element emits light at least when the backlight module is configured in the first state.

7. The backlight module according to claim 6, wherein: The third direction is opposite to the first direction.

8. The backlight module according to claim 1, wherein: The light guide plate further includes a fourth side surface connected to the bottom surface, the backlight module further includes a fourth light bar, the fourth light bar includes a fourth light emitting element arranged on one side of the fourth side surface, the light emitting direction of the fourth light emitting element is arranged toward the fourth side surface and emits light along a fourth direction, and the fourth direction is different from both the first direction and the second direction; The light-guiding structure includes a fourth light-guiding surface arranged opposite to the fourth light-emitting component, and the fourth light-guiding surface is a diffuse reflection surface. When the backlight module is configured in the first state, the fourth light-emitting component does not emit light. When the backlight module is configured in the second state, the fourth light-emitting component emits light.

9. The backlight module according to claim 8, wherein: The fourth direction intersects with the second direction, or the fourth direction is opposite to the second direction.

10. The backlight module according to claim 1, wherein: The first light bar includes a first circuit board, the first light-emitting element is disposed on the first circuit board, the first circuit board is located on a side of the light guide plate provided with the bottom surface, one end of the first circuit board is connected to the first light-emitting element, and the other end of the first circuit board overlaps with the light guide plate along a thickness direction of the light guide plate; The second light strip includes a second circuit board, the second light-emitting component is arranged on the second circuit board, the second circuit board is located on the side of the light guide plate where the bottom surface is provided, one end of the second circuit board is connected to the second light-emitting component, and the other end of the second circuit board overlaps with the light guide plate along the thickness direction of the light guide plate.

11. The backlight module according to claim 10, wherein: A first reflective layer is provided on a surface of the first circuit board that is opposite to the light guide plate, and a second reflective layer is provided on a surface of the second circuit board that is opposite to the light guide plate.

12. A display device comprising a display panel and a backlight module, wherein the display panel is disposed on a light-emitting side of the backlight module; The backlight module includes: a light guide plate, the light guide plate comprising a bottom surface away from the light emitting side of the backlight module and a first side surface and a second side surface connected to the bottom surface, wherein the bottom surface is provided with a plurality of light guide structures; A first light bar, comprising a first light-emitting element disposed on one side of the first side surface, wherein the light-emitting direction of the first light-emitting element is disposed toward the first side surface and emits light along a first direction; a second light bar, comprising a second light-emitting element disposed on one side of the second side surface, wherein the light-emitting direction of the second light-emitting element is disposed toward the second side surface and emits light along a second direction, and the first direction is different from the second direction; In which, the light-guiding structure includes a first light-guiding surface arranged opposite to the first light-emitting component, and a second light-guiding surface arranged opposite to the second light-emitting component, the first light-guiding surface is a mirror reflection surface, and the second light-guiding surface is a diffuse reflection surface, and the backlight module switches between a first state and a second state. When the backlight module is configured to the first state, the first light-emitting component emits light, and the second light-emitting component does not emit light. When the backlight module is configured to the second state, at least the second light-emitting component emits light.

13. The display device according to claim 12, wherein: An included angle between the first light guiding surface and the first direction is smaller than an included angle between the second light guiding surface and the second direction.

14. The display device according to claim 12, wherein: An included angle between the first light guiding surface and the first direction is greater than or equal to 15° and less than or equal to 30°.

15. The display device according to claim 12, wherein: The first light guiding surface is a plane, and the second light guiding surface is an arc surface.

16. The display device according to claim 15, wherein The second light guiding surface protrudes toward a side away from the first light guiding surface.

17. The display device according to claim 12, wherein: The light guide plate further includes a third side surface connected to the bottom surface, the backlight module further includes a third light bar, the third light bar includes a third light emitting element arranged on one side of the third side surface, the light emitting direction of the third light emitting element is arranged toward the third side surface and emits light along a third direction, and the third direction is different from both the first direction and the second direction; The light guide structure includes a third light guide surface arranged opposite to the third light emitting element. The third light guide surface is a mirror reflection surface. The third light emitting element emits light at least when the backlight module is configured in the first state.

18. The display device according to claim 17, wherein: The third direction is opposite to the first direction.

19. The display device according to claim 12, wherein: The light guide plate further includes a fourth side surface connected to the bottom surface, the backlight module further includes a fourth light bar, the fourth light bar includes a fourth light emitting element arranged on one side of the fourth side surface, the light emitting direction of the fourth light emitting element is arranged toward the fourth side surface and emits light along a fourth direction, and the fourth direction is different from both the first direction and the second direction; The light-guiding structure includes a fourth light-guiding surface arranged opposite to the fourth light-emitting component, and the fourth light-guiding surface is a diffuse reflection surface. When the backlight module is configured in the first state, the fourth light-emitting component does not emit light. When the backlight module is configured in the second state, the fourth light-emitting component emits light.

20. The display device according to claim 19, wherein The fourth direction intersects with the second direction, or the fourth direction is opposite to the second direction.

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