Special-shaped backlight module and interior rearview mirror

Abstract

The utility model relates to a special-shaped backlight module. The special-shaped backlight module comprises a light guide plate, a die casting, a light bar, a great wall-shaped adhesive tape and a silica gel block, the die casting is provided with a containing groove, the light bar is arranged on the inner side wall of the containing groove, the great wall-shaped rubber strip is attached to the position, close to the light bar, of the die casting, the great wall-shaped rubber strip is provided with a plurality of grooves, the light bar is provided with a plurality of light beads, and each groove is aligned with one light bead. A limiting boss is arranged on one side of the light guide plate in a protruding mode, the light guide plate is located in the containing groove, the limiting boss on the light guide plate abuts against the lamp strip, and the light guide plate is connected with the great wall-shaped rubber strip. A silica gel groove is formed in the inner side wall, away from the light bar, of the containing groove, the silica gel block is arranged in the silica gel groove, and when the light guide plate is arranged in the containing groove, the light guide plate and the silica gel block are connected in an interference fit mode. The silica gel block is arranged in the containing groove and connected with the light guide plate in an interference fit mode, so that the light guide plate can be stably arranged in the die casting.

Description

Technical Field

[0001] The utility model relates to the technical field of backlight modules, in particular to a special-shaped backlight module and an interior rearview mirror. Background Art

[0002] At present, LED backlight technology is widely used in car instrument displays and rearview mirror displays because of its long service life and low power consumption. Common backlight modules are made by fixing and welding LED flexible circuit boards on one or both sides of the light guide plate. When the light beam emitted by the LED passes through the sawtooth mesh and cylindrical dots on the light guide plate, it will be evenly distributed on the light guide plate to realize the display of the car instrument panel and rearview mirror.

[0003] The display screens of most existing interior rearview mirrors are usually in the shape of irregular quadrilaterals. Therefore, the backlight module required for the screen of the interior rearview mirror is a special-shaped backlight module in order to match the display screen of the interior rearview mirror.

[0004] In the existing special-shaped backlight modules, the light guide plate is also a special-shaped light guide plate to match the shape of the backlight module. Due to its special shape, the special-shaped light guide plate is not easy to be fixed on the die-casting. Moreover, when the special-shaped light guide plate is connected to the light bar, the heat generated by the lamp beads on the light bar when emitting light is easy to affect the sawtooth of the light guide plate, causing the sawtooth to melt, deform or turn yellow, thereby affecting the light-emitting display effect of the backlight module. Utility Model Content

[0005] Based on this, it is necessary to provide a special-shaped backlight module and an interior rearview mirror.

[0006] The utility model solves the above-mentioned technical problems with the following technical solutions: a special-shaped backlight module, comprising: a light guide plate, a die-casting, a light bar, a Great Wall-shaped rubber strip and a silicone block; the die-casting has a receiving groove, the light bar is arranged on the inner side wall of the receiving groove, the Great Wall-shaped rubber strip is attached to the die-casting at a position close to the light bar, the Great Wall-shaped rubber strip has a plurality of grooves, the light bar has a plurality of lamp beads, and each of the grooves is aligned with a lamp bead; a limiting boss is convexly provided on one side of the light guide plate, the light guide plate is located in the receiving groove, the limiting boss on the light guide plate is abutted against the light bar, and the light guide plate is connected to the Great Wall-shaped rubber strip; a silicone groove is provided on the inner side wall of the receiving groove away from the light bar, the silicone block is arranged in the silicone groove, and when the light guide plate is arranged in the receiving groove, the light guide plate and the silicone block are connected by interference fit.

[0007] In one embodiment, a reflective film is provided between the light guide plate and the die-casting; the reflective film is connected to the die-casting by a first fixing adhesive, and the Great Wall-shaped adhesive strip is attached to the reflective film.

[0008] In one embodiment, one side of the reflective film to which the Great Wall-shaped rubber strip is attached is the first side, and the reflective film is folded over to provide a reflective side film on other sides except the first side, one side of the reflective side film abuts against the inner wall of the accommodating groove, and the other side of the reflective side film abuts against the light guide plate.

[0009] In one embodiment, the special-shaped backlight module also includes a diaphragm combination, which is composed of a plurality of optical diaphragms stacked in sequence, a limiting column is provided on a protrusion on a side of the light guide plate facing away from the die-casting, and each of the optical diaphragms is provided with a limiting ear, the diaphragm combination is arranged on the light guide plate, and the diaphragm combination is located in the receiving groove, and the limiting ear of each optical film in the diaphragm combination is hung on the limiting column.

[0010] In one embodiment, a second fixing glue is respectively disposed on the side of each of the optical films, one side of the second fixing glue is connected to the side of the optical film, and the other side of the second fixing glue is connected to the inner side wall of the receiving groove.

[0011] In one embodiment, a single-sided adhesive is provided on a surface of the diaphragm assembly facing away from the light guide plate, a portion of the single-sided adhesive is attached to the diaphragm assembly, and another portion of the single-sided adhesive is bent and attached to the outer side wall of the die-casting.

[0012] In one embodiment, the special-shaped backlight module further includes a plastic frame, and the plastic frame is covered on the die-casting.

[0013] In one embodiment, the rubber frame is provided with a plurality of snap holes, and the die-casting is provided with a plurality of snap blocks protruding thereon. When the rubber frame is covered on the die-casting, each of the snap blocks is snap-fitted into one of the snap holes.

[0014] In one embodiment, the special-shaped backlight module further includes an edge glue, a portion of the edge glue is attached to the outer side wall of the glue frame, and another portion of the edge glue is bent and attached to the die-casting.

[0015] A vehicle interior rearview mirror comprises the special-shaped backlight module described in any one of the above embodiments.

[0016] The beneficial effect of the utility model is as follows: the utility model provides a special-shaped backlight module, by opening a silicone groove on the inner side wall of the receiving groove of the die-casting, and a silicone block is arranged in the silicone groove, and by using the silicone block to be connected with the light guide plate by interference fit, the light guide plate can be firmly arranged in the receiving groove of the die-casting. At the same time, a limiting boss is protruded on the sawtooth side of the light guide plate close to the light source side, and the limiting boss is used to abut on the light bar to achieve the limit of the light guide plate, and the limiting boss can also ensure that the spacing between the sawtooth on the light-incoming side of the light guide plate and the light-emitting surface of the lamp bead on the light bar is consistent, thereby ensuring that there is a safe distance between the sawtooth of the light guide plate and the light-emitting surface of the lamp bead, so as to avoid the heat generated by the lamp bead when the special-shaped backlight module is working. The influence on the sawtooth of the light guide plate, thereby ensuring that the special-shaped backlight module can emit light normally. A Great Wall-shaped rubber strip is arranged in front of the light bar, and the Great Wall-shaped rubber strip has a plurality of grooves, each groove is aligned with a lamp bead, that is, a recess is designed between the lamp beads to avoid the lamp socket. This design can effectively prevent the uneven brightness of the special-shaped backlight module, so as to improve the optical effect in front of the lamp; thereby ensuring the consistency of the overall optical effect of the special-shaped backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, 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 present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a schematic diagram of the three-dimensional structure of a special-shaped backlight module in one direction in one embodiment;

[0019] Figure 2 It is a schematic diagram of a three-dimensional decomposed structure of a special-shaped backlight module in one direction in one embodiment;

[0020] Figure 3 In one embodiment Figure 2 A schematic diagram of the partially enlarged structure of part A;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of a light guide plate, a reflective film and a die-casting in one direction in one embodiment;

[0022] Figure 5 In one embodiment Figure 4 A schematic diagram of the partially enlarged structure of part B;

[0023] Figure 6 A schematic diagram of the three-dimensional structure of a light bar, a reflective film and a die-casting in one direction in one embodiment;

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of the rubber frame and the die-casting part in one direction in one embodiment.

[0025] In the accompanying drawings, 10, special-shaped backlight module; 100, light guide plate; 110, limiting boss; 120, limiting column; 200, die-casting; 210, accommodating groove; 220, silicone groove; 230, buckle block; 300, light strip; 400, Great Wall-shaped rubber strip; 410, groove; 500, silicone block; 600, reflective film; 610, first fixing glue; 620, reflective side film; 700, diaphragm assembly; 710, optical diaphragm; 711, limiting ear; 720, second fixing glue; 730, single-sided glue; 800, rubber frame; 810, buckle hole; 820, edging glue. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The technical solution of the present invention will be further described below in conjunction with the drawings of the embodiments of the present invention, and the present invention is not limited to the following specific implementation methods.

[0027] It should be understood that the same or similar numbers in the drawings of the embodiments correspond to the same or similar parts. In the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom" and the like indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, which 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. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] In one embodiment, Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a special-shaped backlight module 10 includes: a light guide plate 100, a die-casting 200, a light bar 300, a Great Wall-shaped rubber strip 400 and a silicone block 500; the die-casting 200 has a receiving groove 210, the light bar 300 is arranged on the inner side wall of the receiving groove 210, the Great Wall-shaped rubber strip 400 is attached to the die-casting 200 at a position close to the light bar 300, the Great Wall-shaped rubber strip 400 has a plurality of grooves 410, the light bar 300 has a plurality of lamp beads, and each of the grooves 410 is aligned with a lamp bead; the light guide plate A limiting boss 110 is protruded on one side of 100, the light guide plate 100 is located in the accommodating groove 210, the limiting boss 110 on the light guide plate 100 is abutted against the light bar 300, and the light guide plate 100 is connected to the Great Wall-shaped rubber strip 400; a silicone groove 220 is opened on the inner side wall of the accommodating groove 210 away from the light bar 300, the silicone block 500 is arranged in the silicone groove 220, and when the light guide plate 100 is arranged in the accommodating groove 210, the light guide plate 100 and the silicone block 500 are connected by interference fit.

[0029] Specifically, by opening the silicone groove 220 on the inner side wall of the receiving groove 210 of the die-casting 200, and arranging the silicone block 500 in the silicone groove 220, and by using the silicone block 500 to be connected with the light guide plate 100 by interference fit, the light guide plate 100 can be firmly arranged in the receiving groove 210 of the die-casting 200. At the same time, the limiting boss 110 is raised on the serrated side of the light guide plate 100 close to the light source side, and the limiting boss 110 is used to abut against the light bar 300 to limit the light guide plate 100, and the limiting boss 110 can also ensure that the distance between the serrations on the light incident side of the light guide plate 100 and the light-emitting surface of the lamp beads on the light bar 300 remains consistent, thereby ensuring a safe distance between the serrations of the light guide plate 100 and the light-emitting surface of the lamp beads, so as to avoid the heat generated by the lamp beads when the special-shaped backlight module 10 is working. The influence of the serrations of the light guide plate 100, thereby ensuring that the special-shaped backlight module 10 can emit light and display normally. By arranging the Great Wall-shaped rubber strip 400 in front of the light strip 300, and the Great Wall-shaped rubber strip 400 has a plurality of grooves 410, each groove 410 is aligned with a lamp bead, that is, a recess is designed between the lamp beads to avoid the lamp socket. This design can effectively prevent the uneven brightness of the special-shaped backlight module 10, so as to improve the optical effect in front of the lamp; thereby ensuring the consistency of the overall optical effect of the special-shaped backlight module 10.

[0030] In this embodiment, the light bar 300 is connected to the light guide plate 100 , and after the lamp beads on the light bar 300 emit light, the light is diffused to the entire special-shaped backlight module 10 through the light guide plate 100 , thereby realizing normal lighting operation of the special-shaped backlight module 10 .

[0031] In order to improve the luminance of the special-shaped backlight module 10, in one embodiment, Figure 4 , Figure 5 and Figure 6 As shown, a reflective film 600 is arranged between the light guide plate 100 and the die casting 200; the reflective film 600 is connected to the die casting 200 through a first fixing glue 610, and the Great Wall-shaped adhesive strip 400 is attached to the reflective film 600. Specifically, by arranging the reflective film 600 between the light guide plate 100 and the die casting 200, the reflective film 600 can reflect the light guided out of the light guide plate 100 from the side close to the die casting 200, thereby improving the luminous brightness of the special-shaped backlight module 10. At the same time, the reflective film 600 is fixed in the die casting 200 through the first fixing glue 610, and the first fixing glue 610 is a double-sided adhesive. One side of the first fixing glue 610 is adhesively connected to the die casting 200, and the other side of the first fixing glue 610 is adhesively connected to the reflective film 600, so that the reflective film 600 can be firmly arranged in the receiving groove 210 of the die casting 200.

[0032] In order to avoid light leakage from the side of the special-shaped backlight module 10, in one embodiment, Figure 4 , Figure 5 and Figure 6 As shown, one side of the reflective film 600 to which the Great Wall-shaped rubber strip 400 is attached is the first side, and the reflective film 600 is folded to be provided with a reflective side film 620 on the other side except the first side, one side of the reflective side film 620 abuts against the inner side wall of the receiving groove 210, and the other side of the reflective side film 620 abuts against the light guide plate 100. Specifically, the side of the reflective film 600 is folded to obtain the reflective side film 620. The reflective side film 620 is only provided on the other side except the first side, and the reflective side film 620 abuts against the inner side wall of the receiving groove 210, and the reflective side film 620 is not provided except for the silicone groove 220 on the inner side wall of the receiving groove 210. By setting the reflective side film 620 as mentioned above, the light directed to the side of the light guide plate 100 can be reflected back through the reflective side film 620 , thereby avoiding the side light leakage of the special-shaped backlight module 10 , thereby further improving the luminous brightness of the special-shaped backlight module 10 .

[0033] In one embodiment, the height of the reflective side film 620 is equal to the height of the light guide plate 100 .

[0034] In order to make the special-shaped backlight module 10 emit light more evenly and softly, in one embodiment, Figure 2 and Figure 3 As shown, the special-shaped backlight module 10 further includes a film assembly 700, which is formed by stacking a plurality of optical films 710 in sequence. A limiting column 120 is provided on a protrusion of the light guide plate 100 facing away from the die-casting 200, and each of the optical films 710 is provided with a limiting ear 711. The film assembly 700 is arranged on the light guide plate 100, and the film assembly 700 is located in the receiving groove 210. The limiting ear 711 of each of the optical films 710 in the film assembly 700 is hung on the limiting column 120. Specifically, the film assembly 700 is formed by stacking a plurality of optical films 710 in sequence, and the film assembly 700 is arranged on the light guide plate 100. After the light emitted from the light guide plate 100 is refracted by the film assembly 700, the brightness can be improved, and the luminous effect is more uniform. Furthermore, by arranging a limiting post 120 on the light guide plate 100 and opening a corresponding limiting ear 711 on each of the optical films 710, when the film assembly 700 is placed on the light guide plate 100, the limiting post 120 can be clamped in the limiting ear 711 of each of the optical films 710, so that the film assembly 700 can be aligned with the light guide plate 100 to prevent the film assembly 700 from being offset.

[0035] In this embodiment, the optical film 710 includes a brightness enhancement film, a diffusion film, a composite film, a filter film, etc.

[0036] In order to stably place each of the optical films 710 in the receiving groove 210, in one embodiment, as shown in FIG. Figure 2 As shown, the side of each optical film 710 is respectively provided with a second fixing glue 720, one side of the second fixing glue 720 is connected to the side of the optical film 710, and the other side of the second fixing glue 720 is connected to the inner side wall of the receiving groove 210. Specifically, by respectively providing the second fixing glue 720 on the side wall of each optical film 710, the second fixing glue 720 is a double-sided adhesive, one side of the second fixing glue 720 is adhesively connected to the side of the optical film 710, and the other side of the second fixing glue 720 is adhesively connected to the inner side wall of the receiving groove 210, each optical film 710 can be firmly fixed in the receiving groove 210.

[0037] In order to fix the diaphragm assembly 700 in the receiving groove 210, in one embodiment, as shown in FIG. Figure 2 As shown, a single-sided adhesive tape 730 is provided on the surface of the film assembly 700 facing away from the light guide plate 100, a portion of the single-sided adhesive tape 730 is attached to the film assembly 700, and another portion of the single-sided adhesive tape 730 is bent and attached to the outer side wall of the die casting 200. Specifically, by using the single-sided adhesive tape 730 to attach the film assembly 700 to the die casting 200, the film assembly 700 can be prevented from being offset in the receiving groove 210, so that the film assembly 700 can be firmly fixed in the receiving groove 210.

[0038] In one embodiment, Figure 2 and Figure 7 As shown, the special-shaped backlight module 10 further includes a plastic frame 800, and the plastic frame 800 is covered on the die casting 200. By using the plastic frame 800 to cover the die casting 200, the light guide plate 100, the reflective film 600 and the film assembly 700 can be fixed in the receiving groove 210 of the die casting 200 using the plastic frame 800.

[0039] In order to connect the plastic frame 800 and the die casting 200 more firmly, in one embodiment, Figure 2 and Figure 7 As shown, the plastic frame 800 is provided with a plurality of buckle holes 810, and the die casting 200 is provided with a plurality of buckle blocks 230 protruding therefrom. When the plastic frame 800 is covered on the die casting 200, each of the buckle blocks 230 is buckled in one of the buckle holes 810. Specifically, each of the buckle blocks 230 is buckled in one of the buckle holes 810, so that the plastic frame 800 and the die casting 200 can be connected more firmly.

[0040] In order to further connect the plastic frame 800 and the die casting 200 more firmly, in one embodiment, as Figure 2 and Figure 7 As shown, the special-shaped backlight module 10 further includes an edge glue 820, a portion of which is attached to the outer side wall of the glue frame 800, and another portion of which is bent and attached to the die-casting 200. Specifically, the edge glue 820 is provided at the connection between the glue frame 800 and the die-casting 200 for connection, so that the connection between the glue frame 800 and the die-casting 200 can be further stabilized.

[0041] In one embodiment, a rearview mirror inside a vehicle includes the special-shaped backlight module 10 described in any of the above embodiments. Specifically, the display screen of the rearview mirror inside the vehicle matches the special-shaped backlight module 10, and the special-shaped backlight module 10 is used to provide a backlight source for the display screen of the rearview mirror inside the vehicle, so that the rearview mirror inside the vehicle can display a bright screen. The overall luminous effect of the special-shaped backlight module 10 is uniform, so that the rearview mirror inside the vehicle can have a better display effect.

[0042] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A special-shaped backlight module, characterized in that: include: Light guide plates, die castings, light strips, Great Wall-shaped rubber strips and silicone blocks; The die casting has a receiving groove, the light bar is arranged on the inner side wall of the receiving groove, the Great Wall-shaped rubber strip is attached to the position of the die casting close to the light bar, the Great Wall-shaped rubber strip has a plurality of grooves, the light bar has a plurality of lamp beads, and each of the grooves is aligned with a lamp bead; A limiting boss is protruded on one side of the light guide plate, the light guide plate is located in the accommodating groove, the limiting boss on the light guide plate is abutted against the light bar, and the light guide plate is connected to the Great Wall-shaped rubber strip; A silicone groove is provided on the inner side wall of the accommodating groove away from the light bar, the silicone block is arranged in the silicone groove, and when the light guide plate is arranged in the accommodating groove, the light guide plate is connected with the silicone block by interference fit.

2. The special-shaped backlight module according to claim 1, characterized in that: A reflective film is arranged between the light guide plate and the die casting; the reflective film is connected to the die casting by a first fixing glue, and the Great Wall-shaped glue strip is attached to the reflective film.

3. The special-shaped backlight module according to claim 2, characterized in that: The side of the reflective film to which the Great Wall-shaped adhesive strip is attached is the first side, and the reflective film is folded on other sides except the first side to provide a reflective side film, one side of the reflective side film abuts against the inner wall of the accommodating groove, and the other side of the reflective side film abuts against the light guide plate.

4. The special-shaped backlight module according to claim 1, characterized in that: It also includes a diaphragm combination, which is formed by stacking a number of optical diaphragms in sequence, a limiting column is provided on a protrusion on a side of the light guide plate facing away from the die-casting, and each of the optical diaphragms is provided with a limiting ear, the diaphragm combination is arranged on the light guide plate, and the diaphragm combination is located in the receiving groove, and the limiting ear of each optical diaphragm in the diaphragm combination is hung on the limiting column.

5. The special-shaped backlight module according to claim 4, characterized in that: The side edges of each of the optical films are respectively provided with a second fixing glue, one side of the second fixing glue is connected to the side edge of the optical film, and the other side of the second fixing glue is connected to the inner side wall of the accommodating groove.

6. The special-shaped backlight module according to claim 4, characterized in that: A single-sided adhesive is provided on a surface of the diaphragm assembly facing away from the light guide plate, a portion of the single-sided adhesive is attached to the diaphragm assembly, and another portion of the single-sided adhesive is bent and attached to the outer side wall of the die-casting.

7. The special-shaped backlight module according to claim 1, characterized in that: It also includes a rubber frame, which is covered on the die-casting.

8. The special-shaped backlight module according to claim 7, characterized in that: The rubber frame is provided with a plurality of buckle holes, and the die casting is provided with a plurality of buckle blocks protruding therefrom. When the rubber frame is covered on the die casting, each of the buckle blocks is buckled in one of the buckle holes.

9. The special-shaped backlight module according to claim 7, characterized in that: It also includes an edge glue, a part of which is attached to the outer side wall of the glue frame, and another part of which is bent and attached to the die casting.

10. A rearview mirror inside a vehicle, characterized in that: The invention comprises the special-shaped backlight module as described in any one of claims 1 to 9.

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