Backlight module and display device

Abstract

The present application provides a backlight module and a display device. The backlight module includes: a plurality of lamp boards spliced with each other; a light reflector disposed corresponding to the splicing seam between two adjacent lamp boards. By providing a light reflector at the splicing seam between two adjacent lamp boards, the reflection effect of light at the splicing seam is improved, and the shadow problem at the splicing seam is improved.

Description

Technical Field

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

[0002] Currently, for in-vehicle large-size mini-light emitting diode (mini-LED) backlight modules, the light boards of the mini-LED backlight modules usually adopt a spliced light board, that is, multiple light boards are spliced into an integral light board to serve as a backlight source. Due to the limitation of the optical path propagation path of the direct-lit backlight source, when the large-size mini-LED backlight module adopts a split board design, the treatment of the splicing seam generated between adjacent two light boards is a difficult problem encountered currently. Due to the existence of the splicing seam, the light at the splicing position of the direct-lit backlight source is darker, which is optically manifested as a shadow or a dark area in the product, affecting the visual effect.

[0003] Therefore, it is necessary to propose a technical solution to improve the shadow or dark area problem caused by the splicing seam during the splicing of the light boards. Summary of the Invention

[0004] The purpose of the present application is to provide a backlight module and a display device to improve the shadow or dark area problem caused by the splicing seam during the splicing of the light boards.

[0005] To achieve the above purpose, the technical solution is as follows:

[0006] A backlight module, the backlight module includes:

[0007] A plurality of mutually spliced light boards; and

[0008] A light reflecting member, which is arranged corresponding to the splicing seam between adjacent two of the light boards.

[0009] In the above backlight module, one end of the light reflecting member away from the light board has a convex arc-shaped curved surface.

[0010] In the above backlight module, a part of the light reflecting member is located above adjacent two of the light boards.

[0011] In the above backlight module, each light board has a mounting surface, and each light board includes:

[0012] A plurality of light emitting elements, and the plurality of light emitting elements are fixed on the mounting surface of each light board;

[0013] Wherein, the distance between one end of the light reflecting member away from the light board and the mounting surface is less than or equal to 0.5 mm and greater than 0 mm.

[0014] In the above backlight module, the backlight module further includes:

[0015] A backplane, on which a plurality of the light boards are arranged; and

[0016] A connecting member, which is arranged at the splicing seam between two adjacent light boards and connects the reflecting member and the backplane.

[0017] In the above backlight module, the connecting member, the reflecting member and the backplane enclose a card slot, and one ends of two adjacent light boards close to the connecting member are clamped in the card slot.

[0018] In the above backlight module, each light board has an installation surface, and each light board includes:

[0019] A plurality of light-emitting elements, which are fixed on the installation surface of each light board; wherein, the distance from the end of the reflecting member connected to the connecting member to the installation surface is 0.15 mm - 0.25 mm.

[0020] In the above backlight module, the backlight module further includes:

[0021] An inner rubber frame, which is arranged on the light board, and the reflecting member is connected to the inner rubber frame.

[0022] In the above backlight module, the inner rubber frame has a first step surface and a second step surface, the second step surface is located on the side of the first step surface away from the light board, and the backlight module further includes:

[0023] A diffusion plate, which is arranged on the first step surface;

[0024] An optical film, which is arranged on the second step surface.

[0025] A display device, which includes the above backlight module and a liquid crystal display panel, and the liquid crystal display panel is located on the light-emitting side of the backlight module.

[0026] Beneficial effects: The present application provides a backlight module and a display device. The backlight module includes: a plurality of mutually spliced light boards; a reflecting member, which is arranged corresponding to the splicing seam between two adjacent light boards. By arranging the reflecting member at the splicing seam between two adjacent light boards, the reflection effect of light at the splicing seam is improved, and the shadow problem at the splicing seam is improved. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of the display device according to the first embodiment of the present application;

[0028] Figure 2 It is Figure 1 a schematic plan view of the reflecting member connected to the backplane as shown;

[0029] Figure 3 It isFigure 1 Partial enlarged schematic view of the display device shown;

[0030] Figure 4 Schematic diagram of the display device according to the second embodiment of the present application;

[0031] Figure 5 is Figure 4 Planar schematic view of the reflective member shown connected to the inner rubber frame. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0033] First embodiment

[0034] Please refer to Figures 1 - 3 , Figure 1 which is a cross-sectional schematic view of the display device according to the first embodiment of the present application, Figure 2 is Figure 1 Planar schematic view of the reflective member shown connected to the backplane, Figure 3 is Figure 1 Partial enlarged schematic view of the display device shown. The display device 300 includes a backlight module 10 and a liquid crystal display panel 20. The display device 300 can be applied to in-vehicle displays or televisions, etc. The liquid crystal display panel 20 is located on the light-emitting side of the backlight module 10. The backlight module 10 is used to provide a backlight source for the liquid crystal display panel 20. The liquid crystal display panel 20 receives the backlight and controls the transmittance of the backlight, thereby displaying images of different gray levels.

[0035] In this embodiment, the liquid crystal display panel 20 includes an array substrate, a color filter substrate, and a liquid crystal layer located between the array substrate and the color filter substrate.

[0036] In this embodiment, the backlight module 10 includes a backplane 101, a plurality of lamp boards 103, an inner rubber frame 105, a diffusion plate 107, optical films 109, an outer rubber frame 111, and a reflective member 113.

[0037] In this embodiment, the backplane 101 includes a bottom plate 1011 and four side plates 1012 surrounding the bottom plate 1011. The bottom plate 1011 and the four side plates 1012 enclose a receiving cavity 101a. The preparation material of the backplane 101 is aluminum alloy or plastic.

[0038] In this embodiment, multiple light boards 103 are spliced together to provide a large-sized surface light source. The multiple light boards 103 are arranged in the accommodation cavity 101a of the backplane 101 and located on the bottom plate 1011. Each light board 103 includes a printed circuit board (PCB) 1031 and multiple light-emitting elements 1032 arranged in an array on the printed circuit board 1031. The printed circuit board 1031 has a mounting surface 1031a, and each light-emitting element 1032 is fixed on the mounting surface 1031a of the printed circuit board 1031. The light-emitting element 1032 and the printed circuit board 1031 can be connected by solder paste or by conductive adhesive. A reflective layer (not shown) is provided on the mounting surface 1031a of the printed circuit board 1031 to reflect light and improve the utilization rate of light. The light-emitting element 1032 is a sub-millimeter light-emitting diode. It can be understood that the light-emitting element 1032 can also be a micro light-emitting diode (Micro-LED) or other light-emitting elements.

[0039] In this embodiment, the light reflector 113 is arranged corresponding to the splicing seam 103a between two adjacent light boards 103. The light at the splicing seam 103a is reflected by the light reflector 113 to improve the brightness at the splicing seam 103a and solve the problem of shadow or dark area at the splicing seam 103a. The light reflector 113 can be made of transparent plastic to avoid blocking light.

[0040] One end of the light reflector 113 away from the light board 103 has a convex arc-shaped surface 113a. On the one hand, compared with the end of the light reflector 113 away from the light board 103 being a cube, having a convex arc-shaped surface can have a better light reflection effect on the light at the splicing seam 103a. On the other hand, compared with the end of the light reflector 113 away from the light board 103 being a cube, the light-emitting element 1032 emits light within a specific angle range, and having a convex arc-shaped surface can avoid blocking the light emitted by the light-emitting element 1032 to the splicing seam 103a. Specifically, in this embodiment, one end of the light reflector 113 away from the light board 103 has a convex circular arc-shaped surface. In other embodiments, one end of the light reflector 113 away from the light board 103 can also have a convex elliptical arc-shaped surface.

[0041] In this embodiment, a part of the light reflector 113 is located above two adjacent light boards 103, that is, the width D1 of the light reflector 113 is greater than the width of the splicing seam 103a between two adjacent light boards 103, so that the light reflector 113 completely covers the splicing seam 103a. Specifically, as Figure 3 shown, the width D1 of the light reflector 113 is 0.4 mm - 0.6 mm. For example, the width D1 of the light reflector 113 can be 0.5 mm.

[0042] In this embodiment, the distance H1 between the end of the light reflector 113 away from the light board 103 and the mounting surface 1031a is less than or equal to 0.5 mm and greater than 0 mm, so as to prevent the height of the light reflector 113 from being too high and blocking the light emitted by the light-emitting element 1032, resulting in the light emitted by the light-emitting element 1032 not reaching the splicing seam 103a. For example, the distance H1 can be 0.4 mm, 0.3 mm or 0.2 mm.

[0043] In this embodiment, the backlight module 10 further includes a connecting member 115. The connecting member 115 is disposed at the splicing seam 103a between two adjacent light boards 103, and the connecting member 115 connects the light reflector 113 and the back plate 101. Connecting the light reflector 113 to the back plate 101 stabilizes the light reflector 113 and prevents the light reflector 113 from moving. The shape of the connecting member 115 is a cube, and the connecting member 115 can be made of plastic. The connecting member 115 and the light reflector 113 can be integrally formed. The width D2 of the connecting member 115 is greater than 0 and less than or equal to 0.3 mm, which is more conducive to reducing the distance between adjacent light-emitting elements 1032 located on two adjacent light boards 103. For example, the width of the connecting member 115 is 0.1 mm.

[0044] In this embodiment, the connecting member 115, the light reflector 113 and the back plate 101 enclose a card slot 101a, and one ends of two adjacent light boards 103 close to the connecting member 115 are clamped in the card slot 101a to prevent the light board 103 from undergoing obvious displacement. The width D3 of the card slot 101a is greater than or equal to 0.2 mm and less than the width of the light reflector 113, so that while the light board 103 is clamped in the card slot 101a, it is beneficial for the light reflector 113 to shield the edge of the light board 103 close to the splicing seam.

[0045] Further, the distance H2 from the end of the light reflector 113 connected to the connecting member 115 to the mounting surface 1031a is 0.15 mm - 0.25 mm, so as to reserve some space to facilitate the light board 103 to be clamped into the card slot 101a. For example, the distance H2 from the end of the light reflector 113 connected to the connecting member 115 to the mounting surface 1031a is 0.2 mm.

[0046] In this embodiment, the inner glue frame 105 is located within the accommodation cavity 101a and is disposed on the peripheral edge of the plurality of lamp boards 103. The inner glue frame 105 has a first stepped surface 1051, a second stepped surface 1052, a connecting surface 1053, and an inclined surface 1054. The second stepped surface 1052 is located on the side of the first stepped surface 1051 away from the plurality of lamp boards 103. The connecting surface 1053 is connected between the first stepped surface 1051 and the second stepped surface 1052. The connecting surface 1053 is parallel to the side plate 1012 of the back plate 101. The first stepped surface 1051 and the second stepped surface 1052 are parallel to the bottom plate 1011 of the back plate 101. The inclined surface 1054 is connected to the first stepped surface 1051, and the included angle between the inclined surface 1054 and the first stepped surface 1051 is an obtuse angle. The inclined surface 1054 reflects light energy. The inner glue frame 105 is made of plastic.

[0047] In this embodiment, the diffusion plate 107 is disposed on the first stepped surface 1051, and the optical film 109 is disposed on the second stepped surface 1052. The diffusion plate 107 is used to scatter the light emitted by the plurality of light-emitting elements 1032. The optical film 109 includes, but is not limited to, a brightness enhancement film.

[0048] In this embodiment, the outer glue frame 111 is disposed on the back plate 101, and the outer glue frame 111 is fixed to the side plate 1012 of the back plate 101. The outer glue frame 111 is provided with a stepped surface, and the liquid crystal display panel 20 is fixed to the outer glue frame 111 by double-sided tape. The outer glue frame 111 can be prepared from plastic or metal.

[0049] In the display device of the present application, a light reflector is provided at the splicing seam between two adjacent lamp boards to improve the utilization rate of light at the splicing seam, thereby increasing the brightness at the splicing seam.

[0050] Second Embodiment

[0051] As Figure 4 and Figure 5 shown, Figure 4 is a schematic diagram of the display device according to the second embodiment of the present application, Figure 5 and Figure 4 is a schematic plan view of the light reflector connected to the inner glue frame. Figure 4 The display device shown Figure 1 is basically similar to the display device shown. A light reflector 113 is correspondingly provided at the splicing seam 103a between two adjacent lamp boards 103, and the light reflector 113 is located on the edge of two adjacent lamp boards 103 close to the splicing seam 103a. The difference is that the light reflector 113 is connected to the inner glue frame 105, and the light reflector 113 serves as a beam of the inner glue frame 105 to cover the splicing seam 103a between the adjacent lamp boards 103.

[0052] In the display device according to the embodiment of the present application, the reflective member is connected to the inner rubber frame, so that the reflective member reflects the light at the splicing seam, improves the brightness at the splicing seam, and further improves the problem of dark stripes or dark areas at the splicing seam while preventing the displacement of the reflective member. In addition, the reflective member is arranged on the edges of two adjacent lamp boards close to the splicing seam, which can prevent the lamp boards from moving.

[0053] The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and 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, characterized in that, the backlight module includes: a plurality of spliced light boards, the light boards have a mounting surface and include a plurality of light-emitting elements, and the plurality of light-emitting elements are fixed on the mounting surface of each light board; a back plate, provided with a plurality of the light boards; a reflector, corresponding to the splicing seam between two adjacent light boards, and including transparent plastic; a connecting member, disposed at the splicing seam between two adjacent light boards, and connecting the reflector and the back plate, the connecting member is integrally formed with the back plate; the connecting member, the reflector and the back plate enclose a card slot, and one end of two adjacent light boards close to the connecting member is clamped in the card slot; wherein, the distance from the end of the reflector connected to the connecting member to the mounting surface is 0.15 mm - 0.25 mm, and the distance between the end of the reflector away from the light board and the mounting surface is less than or equal to 0.5 mm and greater than 0 mm.

2. The backlight module according to claim 1, characterized in that, the end of the reflector away from the light board has a convex arc surface.

3. The backlight module according to claim 1, characterized in that, a part of the reflector is located above two adjacent light boards.

4. The backlight module according to claim 1, characterized in that, the backlight module further includes: an inner glue frame, the inner glue frame is disposed on the light board, and the reflector is connected to the inner glue frame.

5. The backlight module according to claim 4, characterized in that, the inner glue frame has a first step surface and a second step surface, the second step surface is located on the side of the first step surface away from the light board, and the backlight module further includes: a diffusion plate, disposed on the first step surface; an optical film, disposed on the second step surface.

6. A display device, characterized in that, the display device includes the backlight module according to any one of claims 1-5 and a liquid crystal display panel, and the liquid crystal display panel is located on the light-emitting side of the backlight module.

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