Vehicle-mounted display device and backlight module thereof

Abstract

The backlight module comprises a bottom shell, a lamp panel and a diffusion plate, the bottom shell is provided with a bottom plate and a first side frame which are vertically connected, the first side frame is provided with a first step part, a second step part and an avoiding part, the avoiding part is connected between the first step part and the second step part, the lamp panel is arranged on the bottom plate, and the diffusion plate is arranged on the lamp panel. The diffusion plate is borne on the first bearing face of the first step part, the first bearing face is connected with the avoiding part, and at least part of the diffusion plate is located in the avoiding part. Wherein the first step part is provided with a first side wall, the second step part is provided with a second side wall, the avoiding part is provided with a third side wall, in the first direction, a first distance d1 is formed between the first side wall and the lamp panel, a second distance d2 is formed between the second side wall and the lamp panel, a third distance d3 is formed between the third side wall and the lamp panel, and d2 is larger than d1 and smaller than d3. The expansion space of the diffusion plate is reserved, so that the narrow frame can be realized while the bearing safety is ensured.

Description

Technical Field

[0001] The utility model relates to a backlight module, in particular to a backlight module with a narrow frame and a vehicle-mounted display device comprising the same. Background Art

[0002] With the continuous advancement of display technology, display devices in car cabins are constantly being innovated, and the screen sizes of display devices are getting larger and larger to meet the driving experience of members in different positions in the car cabin. At the same time, people are increasingly pursuing beautiful designs with no borders or narrow borders. Taking liquid crystal display devices as an example, they include a liquid crystal display panel and a backlight module located below it to provide a backlight source for it, such as a direct-down backlight module. The existing direct-down backlight module includes a light source, a shell, a diffuser plate, and an optical film, etc. The light source, the diffuser plate, and the optical film are located in the shell. There is usually a certain gap between the diffuser plate and the optical film and the side wall of the shell frame to reserve space for the film material to expand. In order to ensure the load-bearing safety of the diffuser plate and the optical film, etc., the shell frame usually needs a certain width. In this way, the frame size of the backlight module cannot achieve the effect of a narrow frame. Utility Model Content

[0003] The utility model aims to provide a vehicle-mounted display device and a backlight module thereof, which reserve expansion space for a diffusion plate and meet the trend of narrow frame while ensuring load-bearing safety.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a backlight module, including a bottom shell, a light board and a diffusion plate, the bottom shell has a bottom plate and a first side frame connected vertically, the first side frame has a first step portion, a second step portion and an avoidance portion, the avoidance portion is connected between the first step portion and the second step portion; the light board is arranged on the bottom plate; the diffusion plate is carried on the first bearing surface of the first step portion, the first bearing surface is connected to the avoidance portion, and at least part of the diffusion plate is located in the avoidance portion. Wherein, the first step portion has a first side wall, the second step portion has a second side wall, and the avoidance portion has a third side wall, along the first direction, the first side wall and the light board have a first spacing d1, the second side wall and the light board have a second spacing d2, the third side wall and the light board have a third spacing d3, d1<d2<d3, and the first direction is an extension direction of the light board.

[0005] As an optional technical solution, the backlight module further includes at least one optical film, which is located on the diffusion plate, and along the first direction, there is a distance between the edge of the at least one optical film and the edge of the diffusion plate.

[0006] As an optional technical solution, in the first direction, an edge of the at least one optical film and the light board have a fourth distance d4, d1<d4<d2.

[0007] As an optional technical solution, along the first direction, the edge of the diffusion plate and the light board have a fifth distance d5, d2<d5<d3.

[0008] As an optional technical solution, one side edge of the diffuser plate is entirely located in the avoidance portion; or, one side edge of the diffuser plate has a plurality of protrusions, the first side frame has a plurality of corresponding avoidance portions, and each protrusion is at least partially located in the corresponding avoidance portion.

[0009] As an optional technical solution, the connection between the second step portion and the avoidance portion is rounded.

[0010] As an optional technical solution, the light board includes a circuit board and a plurality of mini LEDs located on the circuit board, and the plurality of mini LEDs are arranged in an array.

[0011] The utility model also provides a vehicle-mounted display device, comprising the aforementioned backlight module, a display panel and an auxiliary carrier, wherein the auxiliary carrier is fixed on the second step portion, the auxiliary carrier has a second carrier surface, and the display panel is fixed on the second carrier surface.

[0012] As an optional technical solution, the vehicle-mounted display device further includes a cover plate, the auxiliary bearing member is stepped and has the second bearing surface and the third bearing surface, and the cover plate is fixed on the third bearing surface.

[0013] As an optional technical solution, in the first direction, the edge of the cover plate and the light board have a sixth distance d6, d6>d3.

[0014] The vehicle-mounted display device and its backlight module of the utility model realize a narrow frame design while ensuring the load-bearing safety of the diffuser plate and at least one optical film, by arranging an avoidance portion corresponding to the edge of the diffuser plate on the first side frame as a space for the film material to expand.

[0015] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a vehicle-mounted display device of the utility model;

[0017] Figure 2 For along Figure 1 A partial cross-sectional view of section A-A';

[0018] Figure 3 It is a schematic diagram of an embodiment of a diffusion plate of the present invention. DETAILED DESCRIPTION

[0019] In order to provide a further understanding of the purpose, structure, features and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0020] The following descriptions of the embodiments refer to the attached drawings to illustrate specific embodiments of the present invention. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention.

[0021] Please refer to Figure 1-3 , Figure 1 A schematic diagram of a vehicle-mounted display device of the utility model; Figure 2 For along Figure 1 A partial cross-sectional view of section A-A'; Figure 3 FIG. 1 is a schematic diagram of an embodiment of a diffusion plate of the present invention. Figure 1 As shown, the vehicle-mounted display device 1 of the present utility model includes a display area 11 and a frame area 12, and the frame area 12 is arranged along the periphery of the display area 11. Figure 2 As shown, the vehicle-mounted display device 1 has a backlight module, and the backlight module includes a bottom shell 2, a light board 3 and a diffusion plate 4. The bottom shell 2 has a bottom plate 21 and a first side frame 22 connected vertically. In actual operation, the bottom plate 21 and the first side frame 22 can be an integrated structure. The light board 3 is arranged on the bottom plate 21. In one embodiment, the vehicle-mounted display device 1 is rectangular, and the bottom shell 2 has a bottom plate 21 in a rectangular shape and side frames connected vertically to the four sides of the bottom plate 21. In other embodiments, the shape of the vehicle-mounted display device 1 is not limited to a rectangle, and the bottom shell 2 can have a bottom plate 21 and side frames connected vertically to each side of the bottom plate 21.

[0022] like Figure 2 As shown, in this embodiment, the first side frame 22 has a first step portion 221, a second step portion 222 and an escape portion 223, and the escape portion 223 is connected between the first step portion 221 and the second step portion 222. The light board 3 is arranged on the bottom plate 21, and the diffuser plate 4 is carried on the first bearing surface 2211 of the first step portion 221, and the first bearing surface 2211 is connected to the escape portion 223, and at least part of the diffuser plate 4 is located in the escape portion 223, so as to provide sufficient support for the diffuser plate and ensure the bearing width of the diffuser plate 4 on the first side frame 22; at the same time, the diffuser plate 4 has not yet contacted the side wall of the escape portion 223, so as to reserve an expansion gap between the diffuser plate 4 and the first side frame 22, and when the diffuser plate 4 expands at high temperature, the escape portion 223 can provide the space required for the expansion of the diffuser plate 4, so as to avoid the phenomenon of wrinkles or arches on the diffuser plate 4 when the vehicle-mounted display device 1 / backlight module is used, thereby improving product quality and ensuring a good visual effect of the backlight module.

[0023] Please continue to refer to Figure 2 The first step portion 221 has a first side wall 2212, the second step portion 222 has a second side wall 2221, and the avoidance portion 223 has a third side wall 2231. Along the first direction F1 (the first direction F1 is an extension direction of the light board 3), the first side wall 2212 and the light board 3 have a first spacing d1, the second side wall 2221 and the light board 3 have a second spacing d2, and the third side wall 2231 and the light board 3 have a third spacing d3, d1<d2<d3. In other words, in the utility model, the first side portion 22 between the first step portion 221 and the second step portion 222 is partially hollowed out to form the avoidance portion 223, which can ensure that sufficient bearing surface and expansion space are provided for the diffuser plate 4, and at the same time reduce the width of the first side frame 22 itself in the first direction F1. In this way, while the width of the first side frame 22 is reduced by setting the avoidance portion 223 to achieve a narrow frame, the bearing safety of the diffuser plate 4 can also be guaranteed. In addition, in the subsequent assembly process, the diffuser plate 4 corresponds to the avoidance portion 223 , which can achieve the positioning of the diffuser plate 4 and improve the convenience of assembly.

[0024] In one embodiment, the backlight module further includes at least one optical film 5, which is, for example, a brightness enhancement film. The at least one optical film 5 is located on the diffuser 4, and along the first direction F1, there is a distance between the edge of the at least one optical film 5 and the edge of the diffuser 4. In actual operation, in the first direction F1, there is a fourth distance d4 between the edge of the at least one optical film 5 and the light board 3, d1<d4<d2, so that there is a distance between the at least one optical film 5 and the second side wall 2221 of the second step portion 222, so as to reserve an expansion gap between the at least one optical film 5 and the first side frame 22. When the at least one optical film 5 expands at high temperature, this distance can provide the space required for the expansion of the at least one optical film 5, so as to avoid the phenomenon of wrinkling or warping of the at least one optical film 5 when it expands at high temperature when the vehicle-mounted display device 1 / backlight module is used. Among them, the edge of at least one optical film 5 is not flush with the diffuser plate 4 and its width is smaller than the diffuser plate 4. By extending one side edge of the diffuser plate 4 into the avoidance portion 223, the phenomenon of uneven side lighting effect caused by gap light leakage and uneven film edge is reduced.

[0025] In one embodiment, along the first direction F1, the edge of the diffuser plate 4 and the light board 3 have a fifth distance d5, d2<d5<d3. That is, when the assembly is completed, the diffuser plate 4 has not yet contacted the third side wall 2231 of the avoidance portion 223, so as to reserve the expansion gap between the diffuser plate 4 and the first side frame 22.

[0026] In one embodiment, the edge of one side of the diffuser plate 4 is completely located at the avoidance portion 223. At this time, a strip-shaped hollow is formed on the first side frame 22 corresponding to the diffuser plate 4 to provide a strip-shaped avoidance portion 223 to accommodate the diffuser plate 4 on this side. However, the present invention is not limited thereto. In another embodiment, Figure 3 As shown, a side edge of the self-diffusing plate 4 has a plurality of protrusions 41. At this time, the first side frame 22 has a plurality of avoidance portions 223 correspondingly, and each protrusion 41 is at least partially located in the corresponding avoidance portion 223. For the convenience of assembly, the plurality of protrusions 41 can be disposed on one side or both side edges (e.g., adjacent two side edges) of the diffuser plate 4.

[0027] In actual operation, Figure 2 As shown, the connection between the second step portion 222 and the avoidance portion 223 is rounded, which reduces the sharpness of the first side frame 22 here, facilitates the subsequent assembly of the diffuser plate 4, etc., and is not likely to cause collision damage to the diffuser plate 4 and at least one optical film 5.

[0028] Continue to refer Figure 2 In this embodiment, the backlight module of the utility model is a direct-down type, and the light board 3 includes a circuit board 31 and a plurality of mini LEDs 32 located on the circuit board 31, and the plurality of mini LEDs 32 are arranged in an array.

[0029] In this embodiment, the light board 3 is arranged on the bottom plate 21, and the diffuser plate 4 is supported on the first supporting surface 2211 of the first step portion 221, so that in the thickness direction of the vehicle-mounted display device 1, there is a distance between the light board 3 and the diffuser plate 4, and this distance provides a mixing distance for the light emitted by each mini LED 32 on the light board 3, so that the light emitted by the light board 3 can have a better uniform effect when entering the diffuser plate 4.

[0030] like Figure 2 As shown, the vehicle-mounted display device 1 of the present invention, in addition to the aforementioned backlight module, also includes a display panel 6 and an auxiliary carrier 7. The auxiliary carrier 7 is fixed on the second step portion 222. The auxiliary carrier 7 has a second carrier surface 71, and the display panel 6 is fixed on the second carrier surface 71.

[0031] In one embodiment, the vehicle-mounted display device 1 further includes a cover plate 8, the auxiliary bearing member 7 is stepped and has a second bearing surface 71 and a third bearing surface 72, and the cover plate 8 is fixed on the third bearing surface 72. Further, in the first direction F1, the edge of the cover plate 8 and the light board 3 have a sixth spacing d6, d6>d3, so that the cover plate 8 plays a good protective role for the display module and the backlight module. The portion of the cover plate 8 corresponding to the display area 11 can be transparent so that the user can watch the image displayed by the display panel 6. The portion of the cover plate 8 corresponding to the frame area 12 can be an opaque area (for example, printed with black ink, etc.) to block other components in the frame area 12. In addition, the cover plate 8 can be a general cover plate or a cover plate with a touch function, etc. In actual operation, the display panel 6 and the second bearing surface 71, and the cover plate 8 and the third bearing surface 72 can be fixed by means of double-sided tape, light-absorbing adhesive or other connecting parts, and the utility model does not limit this.

[0032] The vehicle-mounted display device and its backlight module of the utility model realize a narrow frame design while ensuring the load-bearing safety of the diffuser plate and at least one optical film, by arranging an avoidance portion corresponding to the edge of the diffuser plate on the first side frame as a space for the diffuser plate to expand.

[0033] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A backlight module, characterized in that Include, The bottom shell has a bottom plate and a first side frame connected vertically, the first side frame has a first step portion, a second step portion and an escape portion, and the escape portion is connected between the first step portion and the second step portion; A light panel is arranged on the bottom plate; as well as A diffusion plate is carried on a first carrying surface of the first stepped portion, the first carrying surface is connected to the avoidance portion, and at least a portion of the diffusion plate is located in the avoidance portion; Among them, the first step portion has a first side wall, the second step portion has a second side wall, and the avoidance portion has a third side wall. Along the first direction, the first side wall and the light board have a first distance d1, the second side wall and the light board have a second distance d2, and the third side wall and the light board have a third distance d3, d1<d2<d3, and the first direction is an extension direction of the light board.

2. The backlight module according to claim 1, characterized in that: The backlight module further comprises at least one optical film, which is located on the diffusion plate, and along the first direction, there is a distance between the edge of the at least one optical film and the edge of the diffusion plate.

3. The backlight module according to claim 2, characterized in that: In the first direction, a fourth distance d4 is formed between the edge of the at least one optical film and the light board, where d1<d4<d2.

4. The backlight module according to claim 1, characterized in that: Along the first direction, a fifth distance d5 is formed between the edge of the diffusion plate and the light board, and d2<d5<d3.

5. The backlight module according to claim 4, characterized in that: One side edge of the diffusion plate is entirely located in the avoidance portion; or, a plurality of protrusions are provided from one side edge of the diffusion plate, and the first side frame has a plurality of the avoidance portions correspondingly, and each protrusion is at least partially located in the corresponding avoidance portion.

6. The backlight module according to claim 1, characterized in that: The connection between the second step portion and the avoiding portion is rounded.

7. The backlight module according to claim 1, characterized in that: The light board includes a circuit board and a plurality of mini LEDs located on the circuit board, and the plurality of mini LEDs are arranged in an array.

8. A vehicle-mounted display device, characterized in that Include, The backlight module according to any one of claims 1 to 7, Display panel, and The auxiliary carrier is fixed on the second step portion, and has a second carrying surface. The display panel is fixed on the second carrying surface.

9. The vehicle-mounted display device according to claim 8, characterized in that: The vehicle-mounted display device further comprises a cover plate. The auxiliary bearing member is stepped and has the second bearing surface and a third bearing surface. The cover plate is fixed on the third bearing surface.

10. The vehicle-mounted display device according to claim 9, characterized in that: In the first direction, a sixth distance d6 is formed between the edge of the cover plate and the light board, and d6>d3.

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