Backlight module and display apparatus

Abstract

A backlight module and a display apparatus. The backlight module comprises a circuit board, a first reflective layer, and a second reflective layer that are sequentially stacked from bottom to top, and further comprises a plurality of light-emitting units. Each light-emitting unit comprises a light-emitting member fixed onto the circuit board and a lens covering the light-emitting member; first through holes are formed in the first reflective layer, and the light-emitting members pass through the first through holes in a one-to-one correspondence manner; and second through holes are formed in the second reflective layer, and the lenses cover the first reflective layer and pass through the second through holes in a one-to-one correspondence manner.

Description

Backlight module and display device

[0001] The present application claims priority to the Chinese patent application No. 202421408936.3, filed on June 19, 2024, and entitled "Backlight module and display device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application belongs to the technical field of display, and in particular relates to a backlight module and a display device. BACKGROUND

[0003] In order to improve the reflectivity of the backlight lamp plate, a layer of reflective paper is usually attached to the surface of the lamp plate after the lens is made on the lamp plate. The reflective paper is pre-punched to avoid the lens on the lamp plate. However, this solution has the following problems: the area below the lens cannot be covered by the reflective paper, resulting in the inability to improve the reflectivity of the area below the lens. TECHNICAL SOLUTION

[0004] The embodiments of the present application provide a backlight module and a display device to solve the problem that the existing backlight lamp plate method cannot improve the reflectivity of the area below the lens.

[0005] In a first aspect, the embodiments of the present application provide a backlight module, which comprises a circuit board, a first reflective layer and a second reflective layer stacked in sequence from bottom to top, and a plurality of light emitting units, wherein the light emitting unit comprises a lens and at least one light emitting element, the light emitting element is fixed on the circuit board, and the lens cover is arranged on the light emitting element; the first reflective layer is provided with a plurality of first through holes, and the light emitting element is correspondingly arranged in the first through hole; the second reflective layer is provided with a plurality of second through holes, and the lens cover is arranged above the first reflective layer and correspondingly arranged in the second through hole.

[0006] In a second aspect, the embodiments of the present application further provide a display device, which comprises the backlight module described above. ADVANTAGEOUS EFFECTS

[0007] The backlight module and the display device provided by the embodiments of the present application can improve the reflectivity of the area below the lens by stacking the circuit board, the first reflective layer and the second reflective layer in sequence from bottom to top, fixing the light emitting element of the light emitting unit on the circuit board and arranging it in the first through hole of the first reflective layer, arranging the lens cover on the light emitting element, and arranging the lens cover above the first reflective layer and in the second through hole of the second reflective layer, so that the first reflective layer can cover the area below the lens, thereby improving the reflectivity of the area below the lens, and further improving the backlight effect of the backlight module and the display effect of the display device. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings. In the following description, the same reference numerals represent the same parts.

[0009] Fig. 1 is a structural schematic diagram of a backlight module provided by an embodiment of the present application.

[0010] Fig. 2 is a partial cross-sectional schematic diagram of the backlight module shown in Fig. 1 along the transverse direction.

[0011] Fig. 3 is a structural schematic diagram of the backlight module shown in Fig. 1 after omitting a second reflecting layer.

[0012] Fig. 4 is a structural schematic diagram of the backlight module shown in Fig. 3 after omitting a lens.

[0013] Fig. 5 is a structural schematic diagram of the second reflecting layer provided by an embodiment of the present application.

[0014] Brief Description of Drawings: 100, circuit board; 200, light emitting member; 300, first reflecting layer; 301, first through hole; 302, annular reflecting paper; 400, lens; 500, second reflecting layer; 501, second through hole. Embodiments of the present application

[0015] The technical solutions in the embodiments of the present application will be described clearly and completely in the following description with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0016] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, 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 the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0017] In the present application, the word "exemplary" is used to mean "serving as an example, instance, or illustration". Any implementation described as "exemplary" in the present application is not necessarily to be construed as preferred or advantageous over other implementations. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0018] The embodiment of the present application provides a backlight module, as shown in FIGS. 1-5, which comprises a circuit board 100, a first reflection layer 300 and a second reflection layer 500 which are sequentially stacked from bottom to top, and a plurality of light emitting units, the light emitting unit comprising a lens 400 and at least one light emitting piece 200, the light emitting piece 200 is arranged on the circuit board 100, and the lens 400 is arranged on the light emitting piece 200; the first reflection layer 300 is provided with a plurality of first through holes 301, and the light emitting piece 200 is correspondingly arranged in the first through hole 301; the second reflection layer 500 is provided with a plurality of second through holes 501, and the lens 400 is arranged above the first reflection layer 300 and correspondingly arranged in the second through hole 501. Wherein, "a plurality of" means one or more.

[0019] The backlight module and display device provided by the embodiment of the present application, by sequentially stacking the circuit board 100, the first reflection layer 300 and the second reflection layer 500 from bottom to top, the light emitting piece 200 of the light emitting unit is fixed on the circuit board 100 and arranged in the first through hole 301 of the first reflection layer 300, and the lens 400 is arranged on the light emitting piece 200, and at the same time, the lens 400 is arranged above the first reflection layer 300 and arranged in the second through hole 501 of the second reflection layer 500, so that the first reflection layer 300 can cover the area below the lens 400, thereby improving the reflectivity of the area below the lens 400, and further improving the backlight effect of the backlight module and the display effect of the display device comprising the backlight module.

[0020] Optionally, the circuit board 100 is a PCB (i.e., a printed circuit board), so as to reduce the production cost.

[0021] In some embodiments of the present application, the first through hole 301 has a hole diameter smaller than an outer diameter of the lens 400, and a difference between the outer diameter of the lens 400 and the hole diameter of the first through hole 301 is A, where 0mm < A ≤ 5mm. By setting the difference between the outer diameter of the lens 400 and the hole diameter of the first through hole 301 within the above range, the first reflective layer 300 can effectively cover the area below the lens 400 to improve the reflectivity of the area below the lens 400, while reducing the production cost.

[0022] For example, the difference A between the outer diameter of the lens 400 and the hole diameter of the first through hole 301 can be 0.1mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc., which can be set according to actual needs.

[0023] In some embodiments of the present application, the second through hole 501 has a hole diameter larger than the outer diameter of the lens 400, so as to avoid the edge of the second through hole 501 from touching the lens 400, making it more convenient to set the second reflective layer 500 on the first reflective layer 300.

[0024] Optionally, the difference between the hole diameter of the second through hole 501 and the outer diameter of the lens 400 is B, where 0mm < B ≤ 1mm. By setting the difference between the hole diameter of the second through hole 501 and the outer diameter of the lens 400 within the above range, the edge of the second through hole 501 can be avoided from touching the lens 400, while the second reflective layer 500 can cover more of the area around the lens 400, improving the reflectivity of the second reflective layer 500 and thus improving the backlight effect of the backlight module.

[0025] For example, the difference B between the hole diameter of the second through hole 501 and the outer diameter of the lens 400 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc., which can be set according to actual needs.

[0026] In some embodiments of the present application, the first reflective layer 300 includes a plurality of annular reflective papers 302, the through holes of the annular reflective papers 302 form the first through holes 301, the light emitting pieces 200 are correspondingly arranged in the through holes of the annular reflective papers 302, the lens 400 is correspondingly arranged above the annular reflective papers 302, and the outer diameter of the annular reflective papers 302 is larger than the outer diameter of the lens 400.

[0027] In other embodiments, the first reflective layer 300 can also be a reflective paper, i.e., a plurality of first through holes 301 are formed on a reflective paper to serve as the first reflective layer 300.

[0028] In some embodiments of the present application, the second reflective layer 500 is a reflective paper, i.e., a plurality of first through holes 301 are formed on a reflective paper to serve as the second reflective layer 500.

[0029] In other embodiments, when the number of the light emitting pieces 200 and the lenses 400 is multiple, the second reflective layer 500 can also include a plurality of reflective papers, each of which is provided with a plurality of second through holes 501, and the plurality of reflective papers are spliced together to form the second reflective layer 500.

[0030] In some embodiments of the present application, the center line of the first through hole 301 and the center line of the corresponding second through hole 501 are both coincident with the center line of the corresponding lens 400, thereby ensuring that the first reflective layer 300 and the second reflective layer 500 have the same light shielding area for the light emitted by the light emitting piece 200 in each direction, so that the brightness of the backlight module is uniform, and the problem of high brightness on one side and dimness on the other side due to eccentric arrangement is avoided.

[0031] Optionally, the first through hole 301 is a circular hole or a rectangular hole (e.g., a square hole or a rectangular hole). Optionally, the second through hole 501 can be a circular hole or a rectangular hole (e.g., a square hole or a rectangular hole).

[0032] In some embodiments of the present application, the first through hole 301 and the second through hole 501 have the same shape, e.g., the first through hole 301 and the second through hole 501 are both circular holes, or the first through hole 301 and the second through hole 501 are both square holes.

[0033] In other embodiments, the first through hole 301 and the second through hole 501 can also have different shapes, e.g., the first through hole 301 is a square hole and the second through hole 501 is a circular hole, or the first through hole 301 is a circular hole and the second through hole 501 is a square hole.

[0034] Optionally, the first reflective layer 300 is bonded to the circuit board 100, i.e., the first reflective layer 300 is fixed to the circuit board 100 by adhesive. Optionally, the lens 400 is bonded to the first reflective layer 300, i.e., the lens 400 is fixed to the first reflective layer 300 by adhesive (e.g., heat-set adhesive 700). Optionally, the second reflective layer 500 is bonded to the first reflective layer 300, i.e., the second reflective layer 500 is fixed to the first reflective layer 300 by adhesive.

[0035] In some embodiments of the present application, the number of the light emitting pieces 200 is multiple, and the multiple light emitting pieces 200 are arranged on the circuit board 100 in a rectangular array, so that the brightness of the backlight module can be uniform, the local color difference can be improved, and the backlight effect of the backlight module can be improved. Preferably, the multiple light emitting pieces 200 are arranged on the circuit board 100 in a rectangular array and uniformly. Optionally, the light emitting piece 200 is an LED.

[0036] The present application also provides a display device, which comprises the backlight module, and the specific structure of the backlight module refers to the above-mentioned embodiments. Since the display device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one.

[0037] In the above-mentioned embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0038] The backlight module and the display device provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples; the above-mentioned embodiment is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range can be changed, and the content of the specification should not be understood as the limitation of the present application.

Claims

1. A backlight module, comprising a circuit board (100), a first reflective layer (300) and a second reflective layer (500) which are sequentially stacked from bottom to top, and a plurality of light emitting units, each of the light emitting units comprising a lens (400) and at least one light emitting element (200), the light emitting element (200) being fixed on the circuit board (100), and the lens (400) being arranged on the light emitting element (200). The first reflective layer (300) is provided with a plurality of first through holes (301), and the light emitting element (200) is arranged in the first through hole (301) one by one. The second reflective layer (500) is provided with a plurality of second through holes (501), and the lens (400) is arranged above the first reflective layer (300) and in the second through hole (501) one by one.

2. The backlight module of claim 1, wherein, The aperture of the first through hole (301) is smaller than the outer diameter of the lens (400), and the difference between the outer diameter of the lens (400) and the aperture of the first through hole (301) is A, 0mm < A ≤ 5mm.

3. The backlight module of claim 1, wherein, The aperture of the second through hole (501) is larger than the outer diameter of the lens (400).

4. The backlight module of claim 3, wherein, The difference between the aperture of the second through hole (501) and the outer diameter of the lens (400) is B, 0mm < B ≤ 1mm.

5. The backlight module of claim 1, wherein, The first reflective layer (300) is reflective paper.

6. The backlight module of claim 1, wherein, The first reflective layer (300) comprises a plurality of annular reflective papers (302), the through hole of the annular reflective paper (302) forms the first through hole (301), the light emitting element (200) is arranged in the through hole of the annular reflective paper (302) one by one, the lens (400) is arranged above the annular reflective paper (302) one by one, and the outer diameter of the annular reflective paper (302) is larger than the outer diameter of the lens (400).

7. The backlight module according to any one of claims 1-6, wherein, The second reflective layer (500) is reflective paper.

8. The backlight module according to any one of claims 1-6, wherein, When the number of the light emitting element (200) and the lens (400) is plural, the second reflective layer (500) is formed by splicing a plurality of reflective papers, and each of the reflective papers is provided with the second through hole (501).

9. The backlight module of claim 1, wherein, The center line of the first through hole (301) and the center line of the corresponding second through hole (501) are coincident with the center line of the corresponding lens (400).

10. The backlight module of claim 1, wherein, The first through hole (301) is a circular hole or a rectangular hole.

11. The backlight module of claim 1, wherein, The second through hole (501) is a circular hole or a rectangular hole.

12. The backlight module of claim 1, wherein, The shape of the first through hole (301) is the same as that of the second through hole (501).

13. The backlight module of claim 12, wherein, The first through hole (301) and the second through hole (501) are both circular holes, or the first through hole (301) and the second through hole (501) are both rectangular holes.

14. The backlight module of claim 1, wherein, The shape of the first through hole (301) is different from that of the second through hole (501).

15. The backlight module of claim 14, wherein, The first through hole (301) is a rectangular hole, and the second through hole (501) is a circular hole, or the first through hole (301) is a circular hole, and the second through hole (501) is a rectangular hole.

16. The backlight module of claim 1, wherein, The first reflective layer (300) is bonded to the circuit board (100).

17. The backlight module of claim 1, wherein, The lens (400) is bonded to the first reflective layer (300).

18. The backlight module of claim 1, wherein, The second reflective layer (500) is bonded to the first reflective layer (300).

19. The backlight module of claim 1, wherein, The number of the light emitting pieces (200) is multiple, and the multiple light emitting pieces (200) are arranged on the circuit board (100) in a rectangular array.

20. A display device comprising the backlight module according to any one of claims 1-19.

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