Assembly structure of light guide plate and optical film and backlight module

Abstract

The utility model discloses an assembly structure of a light guide plate and an optical film and a backlight module, the assembly structure comprises the light guide plate, the edge of the light guide plate is convexly provided with a positioning column; the optical film is provided with matched clamping lugs corresponding to the positioning columns, and the positioning columns are sleeved with the clamping lugs so that the optical film can cover the light guide plate; and the shading glue covers the top surface of the positioning column and bends and extends downwards to cover the side surface, corresponding to the opening of the clamping lug, of the positioning column. According to the backlight module, the shading glue covers the top surfaces of the positioning columns and the side surfaces, corresponding to the openings of the clamping lugs, of the positioning columns, so that light emitted by the positioning columns is shaded by the shading glue, the problem that the positioning columns of the light guide plate are shiny is solved, and the light emitting effect of the backlight module is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal display, in particular to an assembly structure of a light guide plate and an optical film and a 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 lamp 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 lamp bar and the optical component are installed in the receiving cavity. The optical component includes a light guide plate and an optical film. Positioning posts are provided on the edge of the light guide plate, and the optical film is provided with clamping ears corresponding to the positioning posts, so as to realize the stable assembly of the optical film and the light guide plate by sleeving the clamping ears on the positioning posts.

[0003] In order to obtain a larger visible area, the display device pursues a narrow border design. However, the narrow border cannot block the positioning posts. Therefore, when the display device is in use, the positioning posts emit light, which affects the light output effect of the backlight module. Summary of the Utility Model

[0004] In order to overcome at least one of the above-mentioned defects of the prior art, the utility model provides an assembly structure of a light guide plate and an optical film and a backlight module to solve the problem that the positioning posts of the light guide plate emit light, thereby improving the light output effect of the backlight module.

[0005] The technical solution adopted by the utility model to solve its problems is as follows:

[0006] An assembly structure of a light guide plate and an optical film, comprising:

[0007] A light guide plate, with positioning posts protruding upwards on the edge of the light guide plate;

[0008] An optical film, with clamping ears correspondingly opened on the optical film for the positioning posts, and the clamping ears sleeve the positioning posts so that the optical film covers the light guide plate;

[0009] A light-shielding glue, covering the top surface of the positioning post and bending downwards to extend to cover the side surface of the positioning post corresponding to the opening of the clamping ear.

[0010] Further, the light-shielding glue includes a PET base layer and an adhesive layer arranged in a stacked manner. The adhesive layer is attached to the top surface of the positioning post and bends downwards to extend to cover the side surface of the positioning post corresponding to the opening of the clamping ear, and the PET base layer covers the adhesive layer.

[0011] Further, the thickness of the light-shielding glue is 0.05 - 0.1 mm.

[0012] Further, the optical film includes a diffusion film, a lower brightness enhancement film, an upper brightness enhancement film and a brightening film which are sequentially arranged from bottom to top, and the diffusion film, the lower brightness enhancement film, the upper brightness enhancement film and the brightening film are all provided with clamping ears correspondingly opened for the positioning posts.

[0013] The present utility model further provides a backlight module, comprising: a die-casting part, a middle iron frame, a lamp strip, a reflective film, and an assembly structure of a light guide plate and optical films. The middle iron frame covers the die-casting part to form a receiving cavity therebetween. The reflective film, the light guide plate, and the optical films are horizontally laid in the receiving cavity from bottom to top, and the optical films abut against the middle iron frame. The lamp strip is fixed on the inner side wall of the die-casting part.

[0014] Further, the die-casting part comprises a bottom plate and side plates. The side plates extend from the circumference of the bottom plate towards the middle iron frame. The lamp strip is fixed on the inner wall of the side plates, and the reflective film is fixed on the bottom plate;

[0015] The middle iron frame comprises an annular iron frame and side frames. The side frames extend from the circumference of the annular iron frame towards the die-casting part and are fixedly connected to the outer walls of the side plates. The optical films abut against the annular iron frame.

[0016] Further, the side plates comprise a first side plate and a second side plate. The lamp strip is fixed on the inner wall of the first side plate;

[0017] The reflective film comprises a bottom film and side films. The bottom film is fixed on the bottom plate, and the side films are fixed on the inner wall of the second side plate and are circumferentially connected to the bottom film. The bottom film and the side films are of an integral structure.

[0018] Further, the light-shielding glue extends downward from the side of the positioning post to cover the side of the light guide plate corresponding to the positioning post. An avoidance opening is formed in the side film corresponding to the light-shielding glue.

[0019] Further, a convex block protrudes from the outer wall of the side plate, and a groove corresponding to the convex block is provided on the inner wall of the side frame. The convex block is clamped in the groove to enable the detachable connection between the middle iron frame and the die-casting part;

[0020] And / or, a clamping block extends upward from the top of the side plate, and a clamping groove corresponding to the clamping block is provided on the annular iron frame. The clamping block is clamped in the clamping groove to enable the detachable connection between the middle iron frame and the die-casting part.

[0021] Further, a gap is provided between the corners of the light guide plate and the inner wall of the die-casting part, and a buffer pad is filled in the gap.

[0022] The beneficial effects of the assembly structure of the light guide plate and the optical films and the backlight module provided by the present utility model are as follows:

[0023] By covering the top surface of the positioning post and the side surface of the positioning post corresponding to the opening of the clamping ear with light-shielding glue to block the light emitted from the positioning post by the light-shielding glue, the problem that the positioning post of the light guide plate emits light is solved, thereby ensuring the light-emitting effect of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an exploded view of the backlight module of the present utility model;

[0025] Figure 2 is Figure 1Enlarged view at location A in the [device];

[0026] Figure 3 This is an exploded view of the reflective film, light guide plate, and optical film sheet of the present utility model.

[0027] Among them, the meanings of the reference numerals are as follows:

[0028] 1. Light guide plate; 11. Positioning post; 2. Optical film sheet; 21. Clamping ear; 22. Diffusion film; 23. Lower brightness enhancement film; 24. Upper brightness enhancement film; 25. Brightness enhancement film; 3. Light-shielding adhesive; 4. Die-cast part; 41. Bottom plate; 42. Side plate; 421. Protrusion; 422. Clamping block; 5. Middle iron frame; 51. Ring iron frame; 511. Card slot; 52. Side frame; 521. Groove; 6. Light bar; 7. Reflective film; 71. Bottom film; 72. Side film; 721. Avoidance opening; 8. Buffer pad; 9. Edge-sealing adhesive. Detailed implementation manners

[0029] For better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0030] In the description of the present utility model, 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. It is only for the convenience of describing the present utility model 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 utility model.

[0031] 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 utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model.

[0032] Embodiment 1

[0033] Refer to Figures 1 - 3 , this embodiment discloses an assembly structure of a light guide plate and an optical film sheet, which includes a light guide plate 1, an optical film sheet 2, and a light-shielding adhesive 3. Among them, positioning posts 11 protrude from the edge of the light guide plate 1. The optical film sheet 2 is provided with clamping ears 21 adapted to the positioning posts 11, and the clamping ears 21 are sleeved on the positioning posts 11 so that the optical film sheet 2 covers the light guide plate 1. The light-shielding adhesive 3 covers the top surface of the positioning posts 11 and bends downward and extends to cover the side surface of the positioning posts 11 corresponding to the openings of the clamping ears 21.

[0034] The positioning post 11 can be provided only one at the edge of the light guide plate 1, or multiple positioning posts can be provided at intervals to improve the installation stability of the optical film 2. The height of the positioning post 11 should not be less than the thickness of the optical film 2 to ensure that the optical film 2 can be positioned and installed through the positioning post 11.

[0035] Since the optical film 2 is sleeved on the positioning post 11 through the ear 21, when the optical film 2 covers the light guide plate 1, the top surface of the positioning post 11 and the side surface of the positioning post 11 corresponding to the opening of the ear 21 are exposed. Due to the design of the narrow border, the positioning post 11 cannot be completely blocked. When the backlight module is in use, the top surface of the positioning post 11 and the side surface of the positioning post 11 corresponding to the opening of the ear 21 will emit light, affecting the light output effect of the backlight module. Therefore, in this embodiment, the top surface of the positioning post 11 and the side surface of the positioning post 11 corresponding to the opening of the ear 21 are covered with a light-shielding adhesive 3 to use the light-shielding adhesive 3 to block the light emitted from the positioning post 11, solving the problem that the positioning post 11 of the light guide plate 1 emits light, thereby ensuring the light output effect of the backlight module.

[0036] In this embodiment, the light-shielding adhesive 3 is a black or gray single-sided adhesive with good light-shielding effect. The thickness of the light-shielding adhesive 3 is 0.05 - 0.1 mm to avoid increasing the size of the backlight module while ensuring the light-shielding effect.

[0037] The light-shielding adhesive 3 includes a PET base layer and an adhesive layer arranged in a stacked manner. The adhesive layer is attached to the top surface of the positioning post 11 and bends downward and extends to cover the side surface of the positioning post 11 corresponding to the opening of the ear 21, and the PET base layer covers the adhesive layer. The PET base layer is exposed and not easily rubbed off to ensure the light output effect of the backlight module.

[0038] On the basis of the above structure, the optical film 2 includes a diffusion film 22, a lower brightness enhancement film 23, an upper brightness enhancement film 24, and a brightness enhancement film 25 arranged in sequence from bottom to top. The diffusion film 22, the lower brightness enhancement film 23, the upper brightness enhancement film 24, and the brightness enhancement film 25 are all provided with ears 21 adapted to the positioning post 11. Between the light guide plate 1 and the diffusion film 22, between the diffusion film 22 and the lower brightness enhancement film 23, between the lower brightness enhancement film 23 and the upper brightness enhancement film 24, and between the upper brightness enhancement film 24 and the brightness enhancement film 25 are all bonded and fixed by a double-sided adhesive. And on the basis of the bonding and fixing, the diffusion film 22, the lower brightness enhancement film 23, the upper brightness enhancement film 24, and the brightness enhancement film 25 are all sleeved on the positioning post 11 through the ears 21, so that the diffusion film 22, the lower brightness enhancement film 23, the upper brightness enhancement film 24, and the brightness enhancement film 25 stably cover the light guide plate 1 from bottom to top.

[0039] Embodiment 2

[0040] Refer to Figures 1 - 3, this embodiment discloses a backlight module, including: a die-cast part 4, a middle iron frame 5, a light bar 6, a reflective film 7, and the assembly structure of the light guide plate and optical film in Embodiment 1. The middle iron frame 5 covers the die-cast part 4 to form a receiving cavity therebetween. The reflective film 7, the light guide plate 1, and the optical film 2 are laid flat from bottom to top in the receiving cavity, and the optical film 2 abuts against the middle iron frame 5. The light bar 6 is fixed to the inner side wall of the die-cast part 4.

[0041] Based on the narrow border design, the middle iron frame 5 cannot completely block the positioning posts 11, causing the positioning posts 11 of the backlight module to emit light and affecting the light output effect of the backlight module. In this embodiment, a light-shielding adhesive 3 is pasted on the top surface of the positioning posts 11 and the side surface of the positioning posts 11 corresponding to the openings of the clamping ears 21, so as to use the light-shielding adhesive 3 to block the light emitted from the positioning posts 11, solving the problem that the positioning posts 11 of the light guide plate 1 emit light, thereby ensuring the light output effect of the backlight module. And, in order to further improve the light-shielding effect, the light-shielding adhesive 3 extends downward from the side surface of the positioning posts 11 to cover the side surface of the light guide plate 1 corresponding to the positioning posts 11.

[0042] Since the height of the positioning posts 11 should not be less than the thickness of the optical film 2, when the height of the positioning posts 11 is slightly greater than the thickness of the optical film 2, the positioning posts 11 abut against the middle iron frame 5. When the height of the positioning posts 11 is equal to the thickness of the optical film 2, both the positioning posts 11 and the optical film 2 abut against the middle iron frame 5 to ensure the stable installation of the optical film 2 and the light guide plate 1.

[0043] The light guide plate 1 is generally a rectangular structure. When installed in the die-cast part 1, the corners of the light guide plate 1 are likely to be damaged by collision when contacting the inner wall of the die-cast part 4. For this reason, in this embodiment, a gap is provided between the corners of the light guide plate 1 and the inner wall of the die-cast part 4, and a buffer pad 8 is filled in the gap. The buffer pad 8 has a buffering effect to avoid the friction and collision between the corners of the light guide plate 1 and the inner wall of the die-cast part 4.

[0044] The die-cast part 4 includes a bottom plate 41 and side plates 42. The side plates 42 extend from the circumference of the bottom plate 41 towards the middle iron frame 5. The light bar 6 is fixed to the inner wall of the side plates 42, and the reflective film 7 is fixed to the bottom plate 41. The middle iron frame 5 includes an annular iron frame 51 and side frames 52. The side frames 52 extend from the circumference of the annular iron frame 51 towards the die-cast part 4 and are fixedly connected to the outer walls of the side plates 42. The optical film 2 abuts against the annular iron frame 51. Specifically, the light bar 6 is fixedly adhered to the inner wall of the side plates 42 through double-sided tape, the reflective film 7 is fixedly adhered to the bottom plate 41 through double-sided tape, and the reflective film 7 and the light guide plate 1 are fixedly adhered to each other through double-sided tape, so that the light bar 6, the reflective film 7, the light guide plate 1, and the optical film 2 can all be stably installed.

[0045] It should be noted that the light bar 6 is not adhered to the entire inner wall of the side plate 42. The side plate 42 includes a first side plate and a second side plate which are adjacent to each other, and the light bar 6 is fixed to the inner wall of the first side plate. On this basis, the reflective film 7 includes a bottom film 71 and a side film 72. The bottom film 71 is fixed to the bottom plate 41, and the side film 72 is fixed to the inner wall of the second side plate and is circumferentially connected to the bottom film 71. The bottom film and the side film 72 cooperate to reflect and improve the light output effect of the backlight module.

[0046] The side film 72 is adhesively fixed to the side surface of the light guide plate 1. Since the light guide plate 1 is provided with a light-shielding adhesive 3 on the side surface corresponding to the positioning post 11, in order to ensure the flatness of the assembly of the side film 72 and the light guide plate 1, the side film 72 is provided with an avoidance opening 721 corresponding to the light-shielding adhesive 3.

[0047] In addition, a convex block 421 protrudes from the outer wall of the side plate 42, and a groove 521 corresponding to the convex block 421 is provided on the inner wall of the side frame 52. The convex block 421 is clamped in the groove 521 to detachably connect the middle iron frame 5 and the die-cast part 4. And / or, a clamping block 422 extends upward from the top of the side plate 42, and a clamping groove 511 corresponding to the clamping block 422 is provided on the ring iron frame 51. The clamping block 422 is clamped in the clamping groove 511 to detachably connect the middle iron frame 5 and the die-cast part 4. The number of the clamping structures of the convex block 421 and the groove 521 and the clamping structures of the clamping block 422 and the clamping groove 511 is set as required. It not only improves the installation stability of the middle iron frame 5 and the die-cast part 1, but also facilitates disassembly to replace the internal structure.

[0048] Moreover, a wrapping adhesive 9 is provided on the side of the backlight module. The wrapping adhesive 9 covers the outer wall of the side frame 52 and extends downward and is bent to the bottom of the bottom plate 41. The setting of the wrapping adhesive 9 can prevent light leakage from the side of the backlight module and prevent impurities from entering the interior of the backlight module. The wrapping adhesive 9 can completely cover the periphery of the backlight module, or can be arranged at intervals at positions where light leakage and / or entry of impurities are likely to occur.

[0049] 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 retouches can be made, and these improvements and retouches are also regarded as the protection scope of the present utility model.

Claims

1. An assembly structure of a light guide plate and an optical film, characterized in that: include: A light guide plate (1), wherein a positioning column (11) is protrudingly provided on an edge of the light guide plate (1); An optical film (2), wherein the optical film (2) is provided with a matching ear (21) corresponding to the positioning column (11), and the ear (21) is sleeved on the positioning column (11) so that the optical film (2) covers the light guide plate (1); Light-shielding glue (3), the light-shielding glue (3) covers the top surface of the positioning column (11), and bends and extends downward to cover the side surface of the positioning column (11) corresponding to the opening of the ear (21).

2. The assembly structure of the light guide plate and the optical film according to claim 1, characterized in that: The light-shielding adhesive (3) comprises a stacked PET base layer and an adhesive layer, wherein the adhesive layer is attached to the top surface of the positioning column (11) and is bent and extended downward to cover the side surface of the positioning column (11) corresponding to the opening of the lug (21), and the PET base layer covers the adhesive layer.

3. The assembly structure of the light guide plate and the optical film according to claim 1, characterized in that: The thickness of the light-shielding glue (3) is 0.05-0.1 mm.

4. The assembly structure of the light guide plate and the optical film according to claim 1, characterized in that: The optical film (2) comprises a diffusion film (22), a lower brightness enhancement film (23), an upper brightness enhancement film (24) and a brightness enhancement film (25) which are arranged in sequence from bottom to top, and the diffusion film (22), the lower brightness enhancement film (23), the upper brightness enhancement film (24) and the brightness enhancement film (25) are all provided with matching ears (21) corresponding to the positioning posts (11).

5. A backlight module, characterized in that: include: A die-casting (4), a middle iron frame (5), a light bar (6), a reflective film (7), and an assembly structure of a light guide plate and an optical film as described in any one of claims 1 to 4, wherein the middle iron frame (5) covers the die-casting (4) to form a receiving cavity therebetween, the reflective film (7), the light guide plate (1) and the optical film (2) are laid flat in the receiving cavity from bottom to top, and the optical film (2) abuts against the middle iron frame (5), and the light bar (6) is fixed to the inner wall of the die-casting (4).

6. The backlight module according to claim 5, characterized in that: The die casting (4) comprises a bottom plate (41) and a side plate (42), wherein the side plate (42) extends from the circumference of the bottom plate (41) toward the middle iron frame (5), the light bar (6) is fixed to the inner wall of the side plate (42), and the reflective film (7) is fixed on the bottom plate (41); The middle iron frame (5) comprises a ring iron frame (51) and a side frame (52); the side frame (52) extends from the circumference of the ring iron frame (51) toward the die casting (4) and is fixedly connected to the outer wall of the side plate (42); and the optical film (2) abuts against the ring iron frame (51).

7. The backlight module according to claim 6, characterized in that: The side panel (42) comprises a first side panel and a second side panel, and the light bar (6) is fixed to the inner wall of the first side panel; The reflective film (7) comprises a bottom film (71) and a side film (72); the bottom film (71) is fixed on the bottom plate (41); the side film (72) is fixed on the inner wall of the second side plate and connected to the circumference of the bottom film (71); the bottom film (71) and the side film (72) are an integral structure.

8. The backlight module according to claim 7, characterized in that: The light-shielding glue (3) extends downward from the side of the positioning column (11) to cover the side of the light guide plate (1) corresponding to the positioning column (11), and the side film (72) is provided with an escape opening (721) corresponding to the light-shielding glue (3).

9. The backlight module according to claim 6, characterized in that: The outer wall of the side plate (42) is provided with a protrusion (421), and the inner wall of the side frame (52) is provided with a groove (521) corresponding to the protrusion (421), and the protrusion (421) is clamped in the groove (521) so that the middle iron frame (5) and the die casting (4) can be detachably connected; And / or, a clamping block (422) extends upward from the top of the side plate (42), and the ring iron frame (51) is provided with a clamping groove (511) corresponding to the clamping block (422), and the clamping block (422) is clamped in the clamping groove (511) so that the middle iron frame (5) and the die-casting (4) can be detachably connected.

10. The backlight module according to claim 5, characterized in that: A gap is provided between the corner of the light guide plate (1) and the inner wall of the die-casting (4), and a buffer pad (8) is filled in the gap.

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