Vehicle-mounted backlight module capable of avoiding light leakage of lower frame and vehicle-mounted display device

Abstract

The utility model provides a vehicle-mounted backlight module capable of avoiding lower frame light leakage, which comprises a lower frame, a reflecting film, a light guide plate and an optical film, the lower frame is provided with an accommodating cavity, the reflecting film, the light guide plate and the optical film are sequentially arranged in the accommodating cavity, the lower frame is provided with a plurality of grooves, the grooves are communicated with the accommodating cavity, and the reflecting film is arranged in the accommodating cavity. The light guide plate is fixedly connected with a plurality of positioning columns, and the positioning columns are arranged in the grooves. According to the vehicle-mounted backlight module capable of avoiding light leakage of the lower frame, the phenomenon of light leakage of the lower frame in the prior art can be solved, the product quality and the production efficiency are improved, the cost is reduced, and the use experience of customers is improved. The utility model further relates to a vehicle-mounted display device.

Description

Technical Field

[0001] The utility model relates to the technical field of display screens, in particular to a vehicle-mounted backlight module and a vehicle-mounted display device for avoiding light leakage at the lower frame. Background Art

[0002] In recent years, new energy vehicles have developed rapidly. There are more and more screens in the vehicle, the size is getting larger and larger, the quality requirements for display are getting higher and higher, the screen frame is getting narrower and narrower, and stricter requirements are put forward for light leakage around. In the conventional design of the backlight module, positioning holes are drilled in the lower iron frame to fix the light guide plate, and the positioning holes penetrate through the bottom plate of the lower iron frame. The columns of the light guide plate pass through the positioning holes for connection and fixation. However, after the light guide plate is assembled, light transmission will occur. At this time, it is necessary to wrap glue outside the lower iron frame for light shielding treatment. The positioning holes are usually at the corners, resulting in very difficult sticking of the black glue, and it is easy to contact and scratch the black glue during the process of producing and assembling the module, resulting in light leakage again. If consumers see obvious light leakage points at the corners of the vehicle screen, it will seriously affect the visual taste and driving pleasure. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a vehicle-mounted backlight module for avoiding light leakage at the lower frame, which can solve the problem of light leakage at the lower frame in the prior art, improve the product quality and production efficiency, reduce the cost, and improve the user experience of customers.

[0004] The utility model provides a vehicle-mounted backlight module for avoiding light leakage at the lower frame, including a lower frame, a reflective film, a light guide plate, and an optical film. The lower frame is provided with a receiving cavity, and the reflective film, the light guide plate, and the optical film are sequentially arranged in the receiving cavity. The lower frame is provided with a plurality of grooves, and each groove is respectively communicated with the receiving cavity. The light guide plate is fixedly connected with a plurality of positioning columns, and each positioning column is respectively arranged in each groove.

[0005] In one embodiment, the depth of the groove is 0.5 mm to 1.5 mm.

[0006] In one embodiment, the groove includes a first groove section and a second groove section. The first groove section is arranged along the thickness direction of the vehicle-mounted backlight module, and the second groove section is arranged perpendicular to the first groove section. The positioning column includes a positioning section and a limiting section. The limiting section is vertically connected to the positioning section. The positioning section is arranged in the first groove section, and the limiting section is arranged in the second groove section.

[0007] In one embodiment, the depth of the first groove section is 0.5 mm to 1.5 mm.

[0008] In one embodiment, an end face of the positioning post away from one end of the light guide plate is provided with an adhesive tape. When the positioning post is arranged in the groove, the positioning post is fixedly connected to the bottom of the groove through the adhesive tape.

[0009] In one embodiment, the adhesive tape includes an adhesive layer and a buffer layer which are fixedly connected to each other. The buffer layer is arranged between the adhesive layer and the positioning post, and the adhesive layer is used for pasting the bottom of the groove.

[0010] In one embodiment, each of the grooves is respectively arranged at four top corners of the lower frame.

[0011] In one embodiment, the lower frame includes a first surface and a second surface which are oppositely arranged. The first surface is arranged in the accommodating cavity, and the second surface is provided with a convex part which is recessed from the first surface towards the second surface.

[0012] In one embodiment, the vehicle-mounted backlight module for preventing light leakage from the lower frame further includes a light bar. The lower frame includes a bottom plate and a side frame fixedly connected to the bottom plate, and the light bar is fixedly connected to the side frame.

[0013] The present invention further relates to a vehicle-mounted display device, including the vehicle-mounted backlight module for preventing light leakage from the lower frame as described above.

[0014] The vehicle-mounted backlight module of the present invention is provided with grooves in the lower frame, but the grooves do not penetrate the bottom plate of the lower frame. The positioning posts of the light guide plate are arranged in the grooves to achieve the functions of limiting and fixing, so as to avoid the phenomenon of light leakage from the lower frame, solve the problem of light leakage caused by tearing the black glue of the lower frame during the production and assembly process of the existing vehicle-mounted backlight module, solve the problem of light leakage from the root, reduce the pasting operation of the sealing hole glue in the prior art, improve the production efficiency and quality of the product, and reduce the material and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a top view structural schematic diagram of the lower frame of the first embodiment of the present invention.

[0017] Figure 2 It is a partial cross-sectional structural schematic diagram of the lower frame of the first embodiment of the present invention.

[0018] Figure 3 It is a schematic partial cross-sectional structure diagram of a light guide plate according to the first embodiment of the present utility model.

[0019] Figure 4 It is a schematic partial cross-sectional structure diagram of a lower frame according to the second embodiment of the present utility model.

[0020] Figure 5 It is a schematic partial cross-sectional structure diagram of a light guide plate according to the second embodiment of the present utility model.

[0021] Figure 6 It is a schematic partial cross-sectional structure diagram of a lower frame according to the third embodiment of the present utility model.

[0022] Explanation of reference numerals in the drawings: groove - 101; first groove section - 1011; second groove section - 1012; accommodation cavity - 102; lower frame - 11; bottom plate - 111; side frame - 112; first surface - 11a; second surface - 11b; convex part - 113; light guide plate - 12; positioning post - 121; positioning section - 1211; limiting section - 1212; tape - 13; buffer layer - 131; adhesive layer - 132.

[0023] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0024] Hereinafter, specific embodiments of the present utility model will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the description of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0025] In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0026] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of description and simplification of the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0027] The terms "first", "second", "third", etc. are only used to distinguish components with similar attributes, rather than indicating or implying relative importance or a specific order.

[0028] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to the elements listed, it may also include other elements not specifically listed.

[0029] As Figures 1 to 3 shown, the vehicle-mounted backlight module for avoiding light leakage from the lower frame includes a lower frame 11, a reflective film, a light guide plate 12, and optical film sheets. The lower frame 11 is provided with a receiving cavity 102. The reflective film, the light guide plate 12, and the optical film sheets are sequentially arranged in the receiving cavity 102. The lower frame 11 is provided with a plurality of grooves 101, and the grooves 101 communicate with the receiving cavity 102. The light guide plate 12 is fixedly connected with a plurality of positioning posts 121, and the positioning posts 121 are arranged in the grooves 101. Among them, each groove 101 is respectively arranged at the four top corners of the lower frame 11, and the depth of the groove 101 is 0.5 mm to 1.5 mm, preferably 0.5 mm, 1 mm or 1.5 mm, etc. That is, the depth of the groove 101 is half of the thickness of the bottom plate 111 of the lower frame 11. The groove 101 can play a limiting role in the horizontal direction for the positioning posts 121, avoiding the phenomenon of loosening or abnormal noise of the light guide plate 12 during the three-combination test or use of the vehicle-mounted backlight module; in addition, the groove 101 is formed by a die extrusion process, and the lower frame 11 is preferably a stamping part or a die-casting part.

[0030] The vehicle-mounted backlight module of the present utility model is provided with grooves 101 on the lower frame 11, but the grooves 101 do not penetrate the bottom plate 111 of the lower frame 11. The positioning posts 121 of the light guide plate 12 are arranged in the grooves 101 to achieve the functions of limiting and fixing, avoiding the phenomenon of light leakage from the lower frame 11, solving the problem of light leakage caused by tearing the black glue of the lower frame 11 during the production and assembly process of the existing vehicle-mounted backlight module, fundamentally solving the problem of light leakage, reducing the attaching operation of the sealing hole glue in the prior art, improving the production efficiency and quality of the product, and reducing the material and labor costs.

[0031] Preferably, an adhesive tape 13 is provided on the end face of the positioning post 121 away from the light guide plate 12. When the positioning post 121 is arranged in the groove 101, the positioning post 121 is fixedly connected to the bottom of the groove 101 through the adhesive tape 13; the adhesive tape 13 includes an adhesive layer 132 and a buffer layer 131 that are fixedly connected to each other. The buffer layer 131 is arranged between the adhesive layer 132 and the positioning post 121. When the vehicle-mounted module is in the three-combination test or use process, the buffer layer 131 can play a buffering role for the positioning post 121, avoiding the phenomenon of fracture of the positioning post 121, and the adhesive layer 132 is used to paste the bottom of the groove 101 to fix the positioning post 121 and the lower frame 11.

[0032] Preferably, the vehicle-mounted backlight module for preventing light leakage from the lower frame further includes a light bar. The lower frame 11 includes a bottom plate 111 and a side frame 112 fixedly connected to the bottom plate 111, and the light bar is fixedly connected to the side frame 112. In this embodiment, the light bar includes a flexible circuit board and a plurality of LED lights. The plurality of LED lights are electrically connected to the flexible circuit board, and each LED light is arranged along the length direction of the flexible circuit board. The flexible circuit board is fixedly connected to the inner wall of the side frame 112 through a thermally conductive double-sided adhesive.

[0033] Preferably, the optical film includes a diffusion film, a brightness enhancement film, and a brightening film. The diffusion film is disposed on the light guide plate 12, the brightness enhancement film is disposed on the diffusion film, and the brightening film is disposed on the brightness enhancement film. Among them, the diffusion film is fixedly connected to the light guide plate 12 through a double-sided adhesive, and the diffusion film, the brightness enhancement film, and the brightening film can be fixedly connected by means of a double-sided adhesive.

[0034] Preferably, the vehicle-mounted backlight module for preventing light leakage from the lower frame further includes a middle frame and a foam adhesive. The middle frame is snap-fitted with the lower frame 11, and the foam adhesive is disposed on the side of the middle frame away from the optical film. The foam adhesive is used for buffering and fixing the display screen.

[0035] Second Embodiment

[0036] As Figure 4 and Figure 5 shown, the vehicle-mounted backlight module of this embodiment is substantially the same in structure as the vehicle-mounted backlight module of the first embodiment, and the difference lies in the different structures of the groove 101 and the positioning post 121.

[0037] Specifically, the groove 101 includes a first groove section 1011 and a second groove section 1012. The first groove section 1011 is arranged along the thickness direction of the vehicle-mounted backlight module, and the second groove section 1012 is arranged perpendicular to the first groove section 1011. The positioning post 121 includes a positioning section 1211 and a limiting section 1212. The limiting section 1212 is vertically connected to the positioning section 1211. The positioning section 1211 is arranged in the first groove section 1011, and the limiting section 1212 is arranged in the second groove section 1012. The limiting section 1212 is used to fix the positioning post 121 to the lower frame 11. The limiting section 1212 has toughness or elasticity. When the positioning post 121 cooperates with the lower frame 11, the limiting section 1212 enters the second groove section 1012 by extrusion, and the limiting section 1212 limits the positioning post 121 in the vertical direction, realizing the fixation of the positioning post 121 in the horizontal and vertical directions. Among them, the depth of the first groove section 1011 is 0.5 mm to 1.5 mm, preferably 0.5 mm, 1 mm or 1.5 mm, etc., but not limited thereto.

[0038] Third Embodiment

[0039] As Figure 6As shown, the in-vehicle backlight module of this embodiment is substantially the same in structure as that of the first embodiment, with the difference being the structure of the lower frame.

[0040] Specifically, the lower frame 11 includes a first surface 11a and a second surface 11b that are oppositely arranged. The first surface 11a is disposed within the accommodation cavity 102, and the second surface 11b is provided with a convex portion 113. The convex portion 113 is recessed from the first surface 11a towards the second surface 11b; it can be understood that when stamping the lower frame 11 to form the groove 101 and the thickness of the bottom plate 111 of the lower frame 11 is insufficient, the convex portion 113 is provided on the second surface 11b of the lower frame 11 to meet the requirement for the depth of the groove 101.

[0041] The present utility model also relates to an in-vehicle display device, including the above-described in-vehicle backlight module that prevents light leakage from the lower frame. The in-vehicle display device of the present utility model is, for example, a high-end in-vehicle instrument, an in-vehicle central control display, an in-vehicle driving recorder, an in-vehicle DVD navigation, an in-vehicle integrated display on the driver's console, or an in-vehicle streaming media rearview mirror, etc., but is not limited thereto.

[0042] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the appended claims.

Claims

1. An in-vehicle backlight module for preventing light leakage from the lower frame, characterized in that, It includes a lower frame (11), a reflective film, a light guide plate (12), and optical film sheets. The lower frame (11) is provided with a receiving cavity (102). The reflective film, the light guide plate (12), and the optical film sheets are sequentially arranged in the receiving cavity (102). The lower frame (11) is provided with a plurality of grooves (101), and each of the grooves (101) is respectively communicated with the receiving cavity (102). The light guide plate (12) is fixedly connected with a plurality of positioning posts (121), and each of the positioning posts (121) is respectively arranged in each of the grooves (101).

2. The vehicle-mounted backlight module for avoiding light leakage of the lower frame according to claim 1, wherein The depth of the groove (101) is 0.5 mm to 1.5 mm.

3. The vehicle-mounted backlight module for avoiding light leakage of the lower frame according to claim 2, wherein The groove (101) includes a first groove section (1011) and a second groove section (1012). The first groove section (1011) is arranged along the thickness direction of the vehicle-mounted backlight module. The second groove section (1012) is arranged perpendicular to the first groove section (1011). The positioning post (121) includes a positioning section (1211) and a limiting section (1212). The limiting section (1212) is vertically connected to the positioning section (1211). The positioning section (1211) is arranged in the first groove section (1011), and the limiting section (1212) is arranged in the second groove section (1012).

4. The vehicle-mounted backlight module for avoiding light leakage of the lower frame according to claim 3, wherein, The depth of the first groove section (1011) is 0.5 mm to 1.5 mm.

5. The vehicle-mounted backlight module for avoiding light leakage of the lower frame according to claim 2, wherein One end face of the positioning post (121) away from the light guide plate (12) is provided with an adhesive tape (13). When the positioning post (121) is arranged in the groove (101), the positioning post (121) is fixedly connected to the bottom of the groove (101) through the adhesive tape (13).

6. The vehicle-mounted backlight module for avoiding light leakage from the lower frame according to claim 5, characterized in that, The adhesive tape (13) includes an adhesive layer (132) and a buffer layer (131) fixedly connected to each other. The buffer layer (131) is arranged between the adhesive layer (132) and the positioning post (121). The adhesive layer (132) is used for pasting the bottom of the groove (101).

7. The vehicle-mounted backlight module for avoiding light leakage of the lower frame according to any one of claims 1 to 6, characterized in that Each of the grooves (101) is respectively arranged at four top corners of the lower frame (11).

8. The vehicle-mounted backlight module for preventing light leakage from the lower frame according to any one of claims 1 to 6, characterized in that The lower frame (11) includes a first surface (11a) and a second surface (11b) arranged oppositely. The first surface (11a) is arranged in the receiving cavity (102). The second surface (11b) is provided with a convex portion (113), and the convex portion (113) is recessed from the first surface (11a) towards the second surface (11b).

9. The vehicle-mounted backlight module for avoiding light leakage from the lower frame according to any one of claims 1 to 6, characterized in that The vehicle-mounted backlight module for preventing light leakage from the lower frame further includes a light bar. The lower frame (11) includes a bottom plate (111) and a side frame (112) fixedly connected to the bottom plate (111). The light bar is fixedly connected to the side frame (112).

10. A vehicle-mounted display device, characterized in that, It includes the vehicle-mounted backlight module for preventing light leakage from the lower frame according to any one of claims 1 to 9.

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