Vehicle-mounted backlight module and vehicle-mounted display device for preventing light guide plate from shifting

Abstract

The utility model provides a vehicle-mounted backlight module for preventing a light guide plate from shifting, comprising a lower frame, a reflective film, a light guide plate, an optical film, a tape and a plurality of flexible parts, wherein the reflective film is arranged in the lower frame, the light guide plate is arranged on the reflective film, the tape is a first tape and a second tape, the first tape and the second tape are arranged opposite to each other, the first tape and the second tape are respectively fixedly connected between the light guide plate and the lower frame, each of the flexible parts is arranged between the light guide plate and the lower frame, the flexible part is provided with a plurality of protrusions, each of the protrusions is interference fit with the light guide plate, and the optical film is arranged on the light guide plate. The vehicle-mounted backlight module for preventing a light guide plate from shifting of the utility model can solve the problems of light guide plate shifting and wrinkles on the reflective film existing in the prior art, and improve the quality of the vehicle-mounted backlight module. The utility model also 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 capable of preventing a light guide plate from shifting. Background Art

[0002] With the rapid development of multi-screen in new energy vehicles, the demand for multi-screen and large-screen is increasing. Therefore, the reliability test requirements of the backlight module are also higher. The vehicle display screen must pass three comprehensive tests before being put into use. The three comprehensive tests refer to the tests of three environmental stresses of comprehensive temperature, humidity and vibration. They are used to assess the adaptability of the product to transportation and use in the comprehensive environment of temperature, humidity and vibration.

[0003] The existing vehicle-mounted backlight module includes a lower frame, a reflective film, a light guide plate and an optical film. The lower frame includes a bottom plate and a side frame fixedly connected to the bottom plate. The reflective film is fixedly connected to the bottom plate by double-sided tape, the light guide plate is fixedly connected to the reflective film by double-sided tape, and the optical film is connected to the light guide plate. Since the reflective film is directly connected to the light guide plate, the lower frame is generally a die-casting or stamping part. When a vehicle-mounted backlight module with a size of more than 12.3 inches is used, under high and low temperature reliability conditions, the reflective film and the light guide plate expand and shrink at the same time. Since the expansion and shrinkage rates of the reflective film and the light guide plate are inconsistent, it is easy to cause the light guide plate to be displaced and the reflective film to be wrinkled. In addition, the light guide plate swings along the Z direction, thereby squeezing the silicone and the optical film, which easily causes insufficient clearance of the optical film in the Z direction, thereby causing the film arch phenomenon caused by the expansion of the optical film, thereby seriously affecting the display effect of the backlight module. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a vehicle-mounted backlight module that prevents the light guide plate from shifting, which can solve the problems of light guide plate shifting and reflective film wrinkling in the prior art and improve the quality of the vehicle-mounted backlight module.

[0005] The utility model provides a vehicle-mounted backlight module for preventing a light guide plate from shifting, comprising a lower frame, a reflective film, a light guide plate, an optical film, an adhesive tape and a plurality of flexible parts, wherein the reflective film is arranged in the lower frame, the light guide plate is arranged on the reflective film, the adhesive tape is a first adhesive tape and a second adhesive tape, the first adhesive tape and the second adhesive tape are arranged opposite to each other, the first adhesive tape and the second adhesive tape are respectively fixedly connected between the light guide plate and the lower frame, each of the flexible parts is arranged between the light guide plate and the lower frame, the flexible parts are provided with a plurality of protrusions, each of the protrusions is interference fit with the light guide plate, and the optical film is arranged on the light guide plate.

[0006] In one embodiment, the flexible member includes a first flexible portion and a second flexible portion that are fixedly connected, the first flexible portion is vertically connected to the second flexible portion, a supporting platform is formed between the first flexible portion and the second flexible portion, the light guide plate is arranged on the supporting platform, each of the protrusions is fixedly connected to the first flexible portion, and the second flexible portion is fixedly connected to the lower frame.

[0007] In one embodiment, the first flexible portion includes an inner surface and an outer surface arranged opposite to each other, the inner surface is arranged on a side of the first flexible portion close to the light guide plate, each of the protrusions is fixedly connected to the inner surface, and the outer surface abuts against or contacts the lower frame.

[0008] In one embodiment, the distance between the inner surface and the light guide plate is 0.15 mm to 0.25 mm.

[0009] In one embodiment, the interference between the protrusion and the light guide plate is 0.1 mm to 0.2 mm.

[0010] In one embodiment, the first flexible portion includes a first flexible segment and a second flexible segment that are fixedly connected, the first flexible segment and the second flexible segment form an L-shape, and the first flexible segment and the second flexible segment are respectively provided with the protrusion.

[0011] In one embodiment, the first adhesive tape and the second adhesive tape are respectively arranged along the length direction of the light guide plate, the first adhesive tape is fixedly connected to the light incident side of the light guide plate, and the second adhesive tape is fixedly connected to the light exit side of the light guide plate.

[0012] In one embodiment, the vehicle-mounted backlight module for preventing the light guide plate from shifting also includes a light bar, the lower frame includes a bottom plate and a side frame fixedly connected to the bottom plate, the first tape and the second tape are fixedly connected between the bottom plate and the light guide plate, and the light bar is fixedly connected to the side frame.

[0013] In one embodiment, the optical film comprises a diffusion film, a light enhancement film and a brightness enhancement film, the diffusion film is arranged on the light guide plate, the light enhancement film is arranged on the diffusion film, and the brightness enhancement film is arranged on the light enhancement film.

[0014] The utility model also relates to a vehicle-mounted display device, comprising the above-mentioned vehicle-mounted backlight module for preventing the light guide plate from shifting.

[0015] The vehicle-mounted backlight module of the utility model attaches a first adhesive tape and a second adhesive tape between the light guide plate and the lower frame to achieve a direct fixed connection between the light guide plate and the lower frame, and then the flexible member between the light guide plate and the lower frame is replaced by a point limiter instead of a surface limiter, so that the convex portion of the flexible member and the light guide plate have an interference fit, thereby increasing the stability of the light guide plate when performing three comprehensive tests, and avoiding the light guide plate to effectively solve the phenomenon of displacement of the light guide plate under the three comprehensive tests. At the same time, it can also avoid the wrinkle phenomenon caused by different expansion and contraction rates between the reflective film and the light guide plate, thereby improving the quality of the vehicle-mounted backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the disassembled structure of the vehicle-mounted backlight module of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the flexible member of the utility model;

[0019] Explanation of the accompanying drawings: lower frame -11; bottom plate -111; side frame -112; reflective film -12; light guide plate -13; optical film -14; diffusion film -141; brightness enhancement film -142; brightness enhancement film -143; first adhesive tape -151; second adhesive tape -152; flexible member -16; first flexible portion -161; convex portion -1611; first flexible section -1612; second flexible section -1613; second flexible portion -162; light strip -17; middle frame -18; foam glue -19.

[0020] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will describe in detail a specific embodiment of the utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of the embodiments. Based on the description of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "install", "connection" and the like 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] The directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of description and simplified description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the utility model.

[0024] The terms "first", "second", "third" and the like are merely used to distinguish elements of similar nature, and do not indicate or imply relative importance or a particular order.

[0025] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0026] like Figure 1 and Figure 2As shown, the vehicle-mounted backlight module for preventing the light guide plate from shifting includes a lower frame 11, a reflective film 12, a light guide plate 13, an optical film 14, a tape and a plurality of flexible parts 16, the reflective film 12 is arranged in the lower frame 11, the light guide plate 13 is arranged on the reflective film 12, the tapes are a first tape 151 and a second tape 152, the first tape 151 and the second tape 152 are arranged opposite to each other, the first tape 151 and the second tape 152 are respectively fixedly connected between the light guide plate 13 and the lower frame 11, each flexible part 16 is arranged between the light guide plate 13 and the lower frame 11, the flexible part 16 is provided with a plurality of protrusions 1611, the protrusions 1611 are arranged at intervals, each protrusion 1611 is interference fit with the light guide plate 13, and the optical film 14 is arranged on the light guide plate 13. In this embodiment, the flexible member 16 is, for example, silicone or rubber, and the lower frame 11 is preferably formed by a stamping part or a die-casting part. The lower frame 11 includes a bottom plate 111 and a side frame 112 fixedly connected to the bottom plate 111. The first adhesive tape 151 and the second adhesive tape 152 are fixedly connected between the bottom plate 111 and the light guide plate 13. The first adhesive tape 151 and the second adhesive tape 152 are respectively arranged along the length direction of the light guide plate 13. The first adhesive tape 151 is fixedly connected to the light incident side of the light guide plate 13, and the second adhesive tape 152 is fixedly connected to the light incident side of the light guide plate 13. 2 is fixedly connected to the light emitting side of the light guide plate 13, and the first adhesive tape 151 and the second adhesive tape 152 are both composite double-sided adhesive tapes; a card block is arranged on the side of the light guide plate 13 away from the reflective film 12, and the optical film 14 is provided with a card slot matched with the card block, and the card block is arranged in the card slot to fix the optical film 14 and the light guide plate 13, and a double-sided adhesive tape can be arranged between the optical film 14 and the light guide plate 13 to increase the stability of the optical film 14 and prevent the optical film 14 from falling off due to vibration in the three comprehensive tests.

[0027] The vehicle-mounted backlight module of the utility model is attached with a first adhesive tape 151 and a second adhesive tape 152 between the light guide plate 13 and the lower frame 11 to realize a direct fixed connection between the light guide plate 13 and the lower frame 11, and then the flexible member 16 between the light guide plate 13 and the lower frame 11 is replaced by a point limiter instead of a surface limiter, so that the convex portion 1611 of the flexible member 16 is interference-fitted with the light guide plate 13, thereby increasing the stability of the light guide plate 13 when performing the three comprehensive tests, avoiding the light guide plate 13 to effectively solve the phenomenon of displacement of the light guide plate 13 under the three comprehensive tests, avoiding the light guide plate 13 from shaking in the Z direction and squeezing the optical film 14, and at the same time avoiding the wrinkle phenomenon caused by the different expansion and contraction rates between the reflective film 12 and the light guide plate 13, thereby improving the quality of the vehicle-mounted backlight module.

[0028] Preferably, the flexible member 16 includes a first flexible portion 161 and a second flexible portion 162 which are fixedly connected, the first flexible portion 161 is vertically connected to the second flexible portion 162, a bearing platform is formed between the first flexible portion 161 and the second flexible portion 162, the light guide plate 13 is arranged on the bearing platform, each convex portion 1611 is fixedly connected to the first flexible portion 161, and the second flexible portion 162 is fixedly connected to the lower frame 11, that is, the second flexible portion 162 is fixedly connected to the lower frame 11 through a double-sided adhesive tape; the first flexible portion 161 includes an inner surface and an outer surface which are arranged oppositely, the inner surface is arranged on a side of the first flexible portion 161 close to the light guide plate 13, the distance between the inner surface and the light guide plate 13 is 0.15 mm to 0.25 mm, preferably 0.15 mm, 0.2 mm or 0.25 mm, etc., each convex portion 1611 is fixedly connected to the inner surface, and the outer surface abuts against or contacts the lower frame 11. In this embodiment, the shape of the convex portion 1611 is preferably cylindrical or rectangular cylindrical, etc., but is not limited thereto.

[0029] Preferably, the interference between the protrusion 1611 and the light guide plate 13 is 0.1 mm to 0.2 mm, preferably 0.1 mm, 0.15 mm or 0.2 mm, but not limited thereto.

[0030] Preferably, the first flexible portion 161 includes a first flexible segment 1612 and a second flexible segment 1613 fixedly connected, the first flexible segment 1612 and the second flexible segment 1613 form an L-shape, the first flexible segment 1612 and the second flexible segment 1613 are respectively provided with a protrusion 1611, wherein the first flexible segment 1612 is provided with two or three protrusions 1611, and the second flexible segment 1613 is provided with two or three, etc., but is not limited to this.

[0031] Preferably, the vehicle-mounted backlight module for preventing the light guide plate from shifting further includes a light bar 17, which is fixedly connected to the side frame 112 by a heat-conductive double-sided adhesive tape. In this embodiment, the light bar 17 includes a flexible circuit board and a plurality of LED lights, which are electrically connected to the flexible circuit board, and each LED light is arranged along the length direction of the flexible circuit board, and the flexible circuit board is fixedly connected to the inner wall of the side frame 112 by a heat-conductive double-sided adhesive tape.

[0032] Preferably, the optical film 14 includes a diffusion film 141, a brightness enhancement film 142 and a brightness enhancement film 143, wherein the diffusion film 141 is arranged on the light guide plate 13, the brightness enhancement film 142 is arranged on the diffusion film 141, and the brightness enhancement film 143 is arranged on the brightness enhancement film 142. The diffusion film is fixedly connected to the light guide plate 13 by double-sided adhesive tape, and the diffusion film 141, the lower brightness enhancement film 142, the upper brightness enhancement film 142 and the brightness enhancement film 143 can be fixedly connected by double-sided adhesive tape.

[0033] Preferably, the vehicle-mounted backlight module for preventing the light guide plate from shifting further includes foam glue 19 , which is disposed on a side of the middle frame 18 away from the optical film 14 , and is used for buffering and fixing the display screen.

[0034] The utility model also relates to a vehicle-mounted display device, including the above-mentioned vehicle-mounted backlight module for preventing the light guide plate from shifting. The vehicle-mounted display device of the utility model is, for example, a high-end vehicle-mounted instrument, a vehicle-mounted central control display, a vehicle-mounted driving recorder, a vehicle-mounted DVD navigation, a vehicle-mounted integrated display screen for the driving console, or a vehicle-mounted streaming media rearview mirror, but is not limited thereto.

[0035] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the attached claims.

Claims

1. A vehicle-mounted backlight module for preventing a light guide plate from shifting, characterized in that: The invention comprises a lower frame (11), a reflective film (12), a light guide plate (13), an optical film (14), an adhesive tape and a plurality of flexible parts (16); the reflective film (12) is arranged in the lower frame (11); the light guide plate (13) is arranged on the reflective film (12); the adhesive tape comprises a first adhesive tape (151) and a second adhesive tape (152); the first adhesive tape (151) and the second adhesive tape (152) are arranged opposite to each other; the first adhesive tape (151) and the second adhesive tape (152) are respectively fixedly connected between the light guide plate (13) and the lower frame (11); each of the flexible parts (16) is arranged between the light guide plate (13) and the lower frame (11); the flexible parts (16) are provided with a plurality of convex parts (1611); each of the convex parts (1611) and the light guide plate (13) are interference fit; and the optical film (14) is arranged on the light guide plate (13).

2. The vehicle-mounted backlight module for preventing the light guide plate from shifting as claimed in claim 1, characterized in that: The flexible member (16) comprises a first flexible portion (161) and a second flexible portion (162) which are fixedly connected, the first flexible portion (161) being vertically connected to the second flexible portion (162), a supporting platform being formed between the first flexible portion (161) and the second flexible portion (162), the light guide plate (13) being arranged on the supporting platform, each of the protrusions (1611) being fixedly connected to the first flexible portion (161), and the second flexible portion (162) being fixedly connected to the lower frame (11).

3. The vehicle-mounted backlight module for preventing the light guide plate from shifting as claimed in claim 2, characterized in that: The first flexible portion (161) comprises an inner surface and an outer surface which are arranged opposite to each other, the inner surface being arranged on a side of the first flexible portion (161) close to the light guide plate (13), each of the protrusions (1611) being fixedly connected to the inner surface, and the outer surface being in abutment with or in contact with the lower frame (11).

4. The vehicle-mounted backlight module for preventing the light guide plate from shifting as claimed in claim 3, characterized in that: The distance between the inner surface and the light guide plate (13) is 0.15 mm to 0.25 mm.

5. The vehicle-mounted backlight module for preventing the light guide plate from shifting as claimed in claim 3, characterized in that: The interference between the convex portion (1611) and the light guide plate (13) is 0.1 mm to 0.2 mm.

6. The vehicle-mounted backlight module for preventing the light guide plate from shifting as claimed in claim 5, characterized in that: The first flexible portion (161) comprises a first flexible segment (1612) and a second flexible segment (1613) which are fixedly connected, the first flexible segment (1612) and the second flexible segment (1613) form an L-shape, and the first flexible segment (1612) and the second flexible segment (1613) are respectively provided with the convex portion (1611).

7. The vehicle-mounted backlight module for preventing the light guide plate from shifting as claimed in claim 1, characterized in that: The first adhesive tape (151) and the second adhesive tape (152) are respectively arranged along the length direction of the light guide plate (13); the first adhesive tape (151) is fixedly connected to the light incident side of the light guide plate (13); and the second adhesive tape (152) is fixedly connected to the light emitting side of the light guide plate (13).

8. The vehicle-mounted backlight module for preventing the light guide plate from shifting as claimed in claim 1, characterized in that: The vehicle-mounted backlight module for preventing the light guide plate from shifting further comprises a light bar (17); the lower frame (11) comprises a bottom plate (111) and a side frame (112) fixedly connected to the bottom plate (111); the first adhesive tape (151) and the second adhesive tape (152) are fixedly connected between the bottom plate (111) and the light guide plate (13); and the light bar (17) is fixedly connected to the side frame (112).

9. The vehicle-mounted backlight module for preventing the light guide plate from shifting as claimed in claim 8, characterized in that: The optical film (14) comprises a diffusion film (141), a brightness enhancement film (142) and a brightness enhancement film (143); the diffusion film (141) is arranged on the light guide plate (13); the brightness enhancement film (142) is arranged on the diffusion film (141); and the brightness enhancement film (143) is arranged on the brightness enhancement film (142).

10. A vehicle-mounted display device, characterized in that: A vehicle-mounted backlight module for preventing the light guide plate from shifting as claimed in any one of claims 1 to 9.

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