Light backlight module

Abstract

The utility model discloses a light backlight module which comprises a die casting, a light bar and an optical assembly, the die casting is of a cavity structure with an upward opening, the optical assembly is flatly laid in the cavity structure, the top face of the optical assembly is flush with the top face of the inner side wall of the die casting, the light bar is fixed to the inner side wall of the die casting, and the light bar is arranged on the side portion of the optical assembly. The circumferential edge of the top face of the optical assembly is covered with shading foam rubber, and the shading foam rubber extends outwards to cover the top face of the inner side wall of the die casting. According to the backlight module, the shading foam rubber covers the peripheral edge of the top surface of the optical assembly and the top surface of the inner side wall of the die casting, so that the optical assembly is fixed in the die casting, the shading foam rubber is used for replacing a middle iron frame to greatly reduce the weight of the backlight module, and the requirement for light weight of the backlight module is met.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal display, in particular to a lightweight backlight module. Background Art

[0002] The backlight module of a vehicle-mounted liquid crystal display device includes a die-casting part, a middle iron frame, a light bar and an optical component. The middle iron frame and the die-casting part are reversely buckled and assembled to form a receiving cavity, and both the light bar and the optical component are installed in the receiving cavity. The frame of the traditional backlight module is relatively wide, resulting in a smaller display visible area and a heavier weight. Thus, the narrow frame design came into being, which can obtain a larger visible area and reduce the weight of the backlight module. However, the narrow frame does not significantly reduce the weight of the backlight module and cannot meet the requirement of lightweight of the backlight module. Content of the Utility Model

[0003] In order to overcome at least one of the above-mentioned defects of the prior art, the utility model provides a lightweight backlight module, which uses a light-shielding foam tape to replace the middle iron frame to meet the requirement of lightweight of the backlight module.

[0004] The technical solution adopted by the utility model to solve its problems is as follows:

[0005] A lightweight backlight module includes: a die-casting part, a light bar and an optical component. The die-casting part is a cavity structure with an upward opening. The optical component is laid flat in the cavity structure, and the top surface of the optical component is flush with the top surface of the inner side wall of the die-casting part. The light bar is fixed on the inner side wall of the die-casting part and is arranged on the side of the optical component;

[0006] The circumferential edge of the top surface of the optical component is covered with a light-shielding foam tape, and the light-shielding foam tape extends outward to cover the top surface of the inner side wall of the die-casting part.

[0007] Further, the die-casting part includes a bottom plate and a side plate of an integral structure. The side plate is arranged at the circumferential edge of the bottom plate and extends upward. The side plate includes an inner side plate and an outer side plate. The outer side plate covers the outer wall of the inner side plate. The light bar is fixed on the inner wall of the inner side plate. The top surface of the optical component is flush with the top surface of the inner side plate. The light-shielding foam tape extends from the circumferential edge of the top surface of the optical component to the top surface of the inner side plate.

[0008] Further, the optical component includes a reflection film, a light guide plate and an optical film sheet arranged in sequence from bottom to top. The top surface of the optical film sheet is flush with the top surface of the inner side plate. A groove is formed by the downward depression of the top of the inner side plate. The edge of the optical film sheet extends toward the inner side plate to form a lug adapted to the groove. The lug and the groove are corresponding in position, and the lug is arranged in the groove. The light-shielding foam tape extends from the circumferential edge of the top surface of the optical film sheet to the top surface of the inner side plate and covers the lug.

[0009] Further, the optical film sheet includes a diffusion film, a lower brightness enhancement film, and an upper brightness enhancement film arranged in sequence from bottom to top. The diffusion film and the upper brightness enhancement film are both provided with lugs adapted to the grooves.

[0010] Further, the outer plate extends upward relative to the inner plate to exceed the inner plate, and the light-shielding foam adhesive extends from the circumferential edge of the top surface of the optical component to the top surface of the inner plate and abuts against the inner wall of the outer plate.

[0011] Further, the reflective film includes a bottom film and a side film. The bottom film is fixed below the light guide plate, and the side film is fixed on the inner wall of the side plate. The side film is arranged adjacent to and opposite the lamp strip.

[0012] Further, positioning posts are provided by extending upward at the circumferential edge of the light guide plate, and the optical film sheet is provided with mating lugs corresponding to the positioning posts. The lugs are sleeved outside the positioning posts.

[0013] Further, there is a gap between the corners of the light guide plate and the inner wall of the side plate, and a buffer pad is press-fitted in the gap.

[0014] Further, the reflective film, the light guide plate, the diffusion film, the lower brightness enhancement film, the upper brightness enhancement film, and the lamp strip are all fixed in the cavity structure by bonding.

[0015] Further, the outer plates are spaced apart to form an interval area, and the interval area is coated with an edge-sealing adhesive. The edge-sealing adhesive coats the outer wall of the inner plate and bends downward to the bottom of the bottom plate.

[0016] The beneficial effects of the backlight module provided by the present utility model are as follows:

[0017] By providing the light-shielding foam adhesive to cover the circumferential edge of the top surface of the optical component and the top surface of the inner wall of the die-cast part, the optical component is fixed in the die-cast part, so that the light-shielding foam adhesive is used to replace the iron middle frame to greatly reduce the weight of the backlight module and meet the requirement of lightweight of the backlight module. Description of the Drawings

[0018] Figure 1 is an exploded view schematic diagram of the lightweight backlight module of the present utility model;

[0019] Figure 2 is a structural schematic diagram of the lightweight backlight module of the present utility model;

[0020] Figure 3 is an exploded view of the lightweight backlight module of the present utility model.

[0021] Among them, the meanings of the reference numerals are as follows:

[0022] 1. Die-cast part; 11. Bottom plate; 12. Side plate; 121. Inner side plate; 122. Outer side plate; 123. Groove; 2. Light bar; 3. Backlight assembly; 31. Reflective film; 311. Bottom film; 312. Side film; 32. Light guide plate; 321. Positioning post; 33. Optical film; 331. Lug; 332. Clamping ear; 333. Diffusion film; 334. Lower brightness enhancement film; 335. Upper brightness enhancement film; 4. Light-shielding foam adhesive; 5. Buffer pad; 6. Edge-sealing adhesive. Detailed implementation manner

[0023] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying 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 invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] Refer to Figures 1-3 , the present invention discloses a light backlight module, including: a die-cast part 1, a light bar 2 and an optical component 3. The die-cast part 1 is a cavity structure with an upward opening. The optical component 3 is laid flat in the cavity structure. The top surface of the optical component 3 is flush with the top surface of the inner side wall of the die-cast part 1. The light bar 2 is fixed on the inner side wall of the die-cast part 1, and the light bar 2 is arranged on the side of the optical component 3; the circumferential edge of the top surface of the optical component 3 is covered with a light-shielding foam adhesive 4, and the light-shielding foam adhesive 4 extends outward to cover the top surface of the inner side wall of the die-cast part 1.

[0027] Thus, the light backlight module fixes the optical component 3 in the die-cast part 1 by arranging the light-shielding foam adhesive 4 to cover the circumferential edge of the top surface of the optical component 3 and the top surface of the inner side wall of the die-cast part 1, so as to use the light-shielding foam adhesive 4 to replace the iron frame in the middle to greatly reduce the weight of the backlight module and meet the requirement of light weight of the backlight module.

[0028] Specifically, the die-cast part 1 includes a bottom plate 11 and a side plate 12 of an integral structure. The side plate 12 is provided at the circumferential edge of the bottom plate 11 and extends upward. The side plate 12 includes an inner side plate 121 and an outer side plate 122. The outer side plate 122 covers the outer wall of the inner side plate 121. The light bar 2 is fixed to the inner wall of the inner side plate 121. The top surface of the optical component 3 is flush with the top surface of the inner side plate 121. The light-shielding foam tape 4 extends from the circumferential edge of the top surface of the optical component 3 to the top surface of the inner side plate 121.

[0029] The inner side plate 121 and the outer side plate 122 are arranged in internal and external contact. The outer side plate 122 extends upward beyond the inner side plate 121. The light-shielding foam tape 4 extends from the circumferential edge of the top surface of the optical component 3 to the top surface of the inner side plate 121 and abuts against the inner wall of the outer side plate 122. Thus, the light-shielding foam tape 4 has a good light-shielding effect to avoid light leakage at the circumferential edge of the backlight module.

[0030] The outer side plate 122 can be a continuous structure that completely covers the outer wall of the inner side plate 121. Alternatively, the outer side plate 122 is a discontinuous structure. The outer side plate 122 is arranged at intervals to form an interval area. The edge-sealing glue 6 is coated in the interval area. The edge-sealing glue 6 covers the outer wall of the inner side plate 121 and bends downward to the bottom of the bottom plate 11. The setting of the edge-sealing glue 6 can not only avoid light leakage at the side of the backlight module but also prevent impurities from entering the inside of the backlight module.

[0031] On the basis of the above structure, the optical component 3 includes a reflection film 31, a light guide plate 32, and an optical film 33 arranged in sequence from bottom to top. Among them, the reflection film 31 includes a bottom film 311 and a side film 312. The bottom film 311 is fixed below the light guide plate 32, and the side film 312 is fixed to the inner wall of the side plate 12. The side film 312 is arranged adjacent to and opposite to the light bar 2. The bottom film 311 and the side film 312 cooperate to reflect the light emitted by the light bar 2 to the light guide plate 32 to ensure the light output intensity of the backlight module.

[0032] The top surface of the optical film 33 is flush with the top surface of the inner side plate 121. A groove 123 is formed by the downward depression at the top of the inner side plate 121. The edge of the optical film 33 extends toward the inner side plate 121 to form a lug 331 adapted to the groove 123. The lug 331 corresponds to the position of the groove 123. The lug 331 is arranged in the groove 123. The light-shielding foam tape 4 extends from the circumferential edge of the top surface of the optical film 33 to the top surface of the inner side plate 121 and covers the lug 331. The connection structure of the lug 331 and the groove 123 enables the optical film 33 to be stably installed in the die-cast part 1.

[0033] The optical film 33 includes a diffusion film 333, a lower brightness enhancement film 334, and an upper brightness enhancement film 335 arranged in sequence from bottom to top. The diffusion film 333 and the upper brightness enhancement film 335 are both provided with lugs 331 adapted to the fitting grooves 123. Since the brightness enhancement film has a light-gathering effect, if both the lower brightness enhancement film 334 and the upper brightness enhancement film 335 are provided with lugs 331, there will be a shadow when the light-shielding foam adhesive 4 covers the lugs, affecting the light output effect of the backlight module. Therefore, the upper brightness enhancement film 335 is provided with lugs 331 to ensure the stable installation of the optical film 33, and the lower brightness enhancement film 334 is not provided with lugs 331 to avoid the appearance of shadows. At the same time, the diffusion film 333 is provided with lugs 331, which can further improve the installation stability of the optical film 33.

[0034] In addition to the above structure, positioning posts 321 extend upward from the circumferential edge of the light guide plate 32. The optical film 33 is provided with mating lugs 332 corresponding to the positioning posts 321, and the lugs 332 are sleeved outside the positioning posts 321. The diffusion film 333, the lower brightness enhancement film 334, and the upper brightness enhancement film 335 are all provided with lugs 332. The sleeved structure of the lugs 332 and the positioning posts 321 further improves the installation stability of the optical film 33.

[0035] Moreover, in the present utility model, the reflective film 31, the light guide plate 32, the diffusion film 333, the lower brightness enhancement film 334, the upper brightness enhancement film 335, and the lamp strip 2 are all fixedly bonded in the cavity structure. That is, the bottom film 311 is bonded to the bottom plate 11 through double-sided adhesive, and the side film 312 and the lamp strip 2 are bonded to the inner wall of the inner side plate 121 through double-sided adhesive. Between the bottom film 311 and the light guide plate 32, between the light guide plate 32 and the diffusion film 333, between the diffusion film 333 and the lower brightness enhancement film 334, and between the lower brightness enhancement film 334 and the upper brightness enhancement film 335, they are all fixedly bonded through double-sided adhesive to ensure that the lamp strip 2 and the optical component 3 are both stably installed in the cavity structure of the die-casting part 1.

[0036] In addition, there is a gap between the corners of the light guide plate 32 and the inner wall of the side plate 12, and a buffer pad 5 is press-fitted in the gap. The setting of the buffer pad 6 has a certain buffering effect to prevent the corners of the light guide plate 42 from colliding with the inner side wall of the die-casting part 1 and being damaged.

[0037] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A lightweight backlight module, characterized in that: include: A die casting (1), a light bar (2) and an optical component (3), wherein the die casting (1) is a cavity structure with an opening facing upward, the optical component (3) is laid flat in the cavity structure, the top surface of the optical component (3) is flush with the top surface of the inner side wall of the die casting (1), the light bar (2) is fixed to the inner side wall of the die casting (1), and the light bar (2) is arranged on the side of the optical component (3); The circumferential edge of the top surface of the optical component (3) is covered with light-shielding foam glue (4), and the light-shielding foam glue (4) extends outward to cover the top surface of the inner side wall of the die-casting (1).

2. The lightweight backlight module according to claim 1, characterized in that: The die-casting (1) comprises a bottom plate (11) and a side plate (12) of an integral structure, wherein the side plate (12) is arranged at the circumferential edge of the bottom plate (11) and extends upward, and the side plate (12) comprises an inner plate (121) and an outer plate (122), wherein the outer plate (122) is covered on the outer wall of the inner plate (121), the light bar (2) is fixed on the inner wall of the inner plate (121), the top surface of the optical component (3) is flush with the top surface of the inner plate (121), and the shading foam glue (4) extends from the circumferential edge of the top surface of the optical component (3) to the top surface of the inner plate (121).

3. The lightweight backlight module according to claim 2, characterized in that: The optical component (3) comprises a reflective film (31), a light guide plate (32) and an optical film (33) which are arranged in sequence from bottom to top; the top surface of the optical film (33) is flush with the top surface of the inner plate (121); the top of the inner plate (121) is concave to form a groove (123); the edge of the optical film (33) extends toward the inner plate (121) to form a lug (331) adapted to the groove (123); the lug (331) corresponds to the position of the groove (123); the lug (331) is arranged in the groove (123); the light-shielding foam glue (4) extends from the circumferential edge of the top surface of the optical film (33) to the top surface of the inner plate (121) and covers the lug (331).

4. The lightweight backlight module according to claim 3, characterized in that: The optical film (33) comprises a diffusion film (333), a lower brightness enhancement film (334) and an upper brightness enhancement film (335) which are arranged in sequence from bottom to top, and the diffusion film (333) and the upper brightness enhancement film (335) are both provided with the lug (331) adapted to the groove (123).

5. The lightweight backlight module according to claim 2, characterized in that: The outer plate (122) extends upwards compared to the inner plate (121) to exceed the inner plate (121), and the light-shielding foam glue (4) extends from the circumferential edge of the top surface of the optical component (3) to the top surface of the inner plate (121) and abuts against the inner wall of the outer plate (122).

6. The lightweight backlight module according to claim 3, characterized in that: The reflective film (31) comprises a bottom film (311) and a side film (312); the bottom film (311) is fixed below the light guide plate (32); the side film (312) is fixed to the inner wall of the side plate (12); and the side film (312) is arranged adjacent to and opposite to the light bar (2).

7. The lightweight backlight module according to claim 3, characterized in that: A positioning column (321) is provided on the circumferential edge of the light guide plate (32) extending upward, and the optical film (33) is provided with a matching ear (332) corresponding to the positioning column (321), and the ear (332) is sleeved outside the positioning column (321).

8. The lightweight backlight module according to claim 3, characterized in that: There is a gap between the corner of the light guide plate (32) and the inner wall of the side plate (12), and a buffer pad (5) is provided in the gap for interference fit.

9. The lightweight backlight module according to claim 4, characterized in that: The reflective film (31), the light guide plate (32), the diffusion film (333), the lower brightness enhancement film (334), the upper brightness enhancement film (335) and the light bar (2) are all fixed in the cavity structure by bonding.

10. The lightweight backlight module according to claim 2, characterized in that: The outer plates (122) are arranged at intervals to form a spacing area, and the spacing area is coated with an edge glue (6). The edge glue (6) is coated on the outer wall of the inner plate (121) and bent downward to the bottom of the bottom plate (11).

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