Duplex screen side-in type backlight module and display device

Abstract

The utility model relates to a duplex screen side-entry type backlight module and a display device, the duplex screen side-entry type backlight module comprises a bottom plate, two reflecting films, two light guide plates and two middle frames, the first sides of the light guide plates abut against elastic limiting blocks on the first sides of mounting grooves, limiting bosses are arranged on the second sides of the light guide plates, and the two middle frames are arranged on the bottom plate. The limiting boss abuts against the side wall of the second side of the mounting groove, so that the light guide plate can be mounted in the mounting groove in an interference fit mode and can be stably mounted on the bottom plate. Meanwhile, when the middle frame is buckled on the bottom plate, the limiting columns on the light guide plate are embedded in the limiting through holes of the middle frame, the light guide plate can be further fixed, and therefore the duplex screen side-in type backlight module has a good display effect.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid crystal backlight, in particular to a double-screen side-entry backlight module and a display device. Background Art

[0002] At present, LED backlight technology is widely used in in-vehicle instrument 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 a 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.

[0003] In the existing dual-screen backlight module, the light guide plate is installed in the bottom frame, but it is easy to become loose and shifted during operation, and the light guide plate cannot be stably fixed, which affects the display effect of the backlight module. Utility Model Content

[0004] Based on this, it is necessary to provide a dual-screen side-entry backlight module and a display device.

[0005] The utility model solves the above technical problems with the following technical solutions: A dual-screen side-entry backlight module, comprising:

[0006] A bottom plate, wherein two installation grooves are arranged at intervals on the bottom plate, and an elastic limiting block is arranged in each of the installation grooves, and a first side of the elastic limiting block is connected to a side wall of the first side of the installation groove;

[0007] Two reflective films, each of which is disposed in one of the mounting grooves;

[0008] Two light guide plates, each of which is arranged in one of the mounting grooves, the first surface of the light guide plate is spaced from the reflective film, a limiting column is arranged on the second surface of the light guide plate, the first side of the light guide plate abuts against the second side of the elastic limiting block, a limiting boss is arranged on the second side of the light guide plate, and the limiting boss abuts against the side wall of the second side of the mounting groove;

[0009] Two middle frames, the middle frames are buckled on the bottom plate, each of the middle frames is movably abutted against the edges of the light guide plate, and the middle frames are provided with limiting through holes, and the limiting posts are embedded in the limiting through holes.

[0010] In one embodiment, an interference protrusion is provided on the second side of the elastic limiting block, and the interference protrusion abuts against the first side of the light guide plate.

[0011] In one embodiment, the number of the interference protrusions is set to two or more.

[0012] In one embodiment, the dual-screen edge-entry backlight module also includes: a flexible circuit board, which is arranged on the side wall of the second side of the mounting groove, and the flexible circuit board is aligned with the second side of the light guide plate, and a plurality of lamp beads are arranged on a surface of the flexible circuit board facing the light guide plate.

[0013] In one embodiment, the dual-screen edge-entry backlight module further includes: an optical film assembly, wherein the optical film assembly is disposed on the second surface of the light guide plate, and a limiting ear is provided on the optical film of the optical film assembly, and the limiting column is engaged in the limiting ear.

[0014] In one embodiment, the dual-screen edge-entry backlight module further includes: a foam adhesive layer, wherein the foam adhesive layer is disposed on the middle frame, and the foam adhesive layer seals the limiting through hole.

[0015] In one embodiment, the cross-sectional shape of the elastic limiting block is L-shaped.

[0016] In one embodiment, a connecting groove is formed at the bottom of the installation groove, and the elastic limiting block is arranged in the connecting groove.

[0017] In one embodiment, an adhesive layer is disposed on the side wall of the connection groove, a first surface of the adhesive layer is connected to the side wall of the connection groove, and a second surface of the adhesive layer is connected to the elastic limiting block.

[0018] The utility model also provides a display device, comprising the dual-screen side-entry backlight module described in any one of the above embodiments.

[0019] The beneficial effects of the utility model are as follows: the utility model provides a dual-screen side-entry backlight module, through the first side of the light guide plate abutting against the elastic limit block on the first side of the mounting groove, a limit boss is provided on the second side of the light guide plate, and the limit boss abuts against the side wall of the second side of the mounting groove, so that the light guide plate can be installed in the mounting groove by interference fit and can be stably installed on the bottom plate. At the same time, when the middle frame is buckled on the bottom plate, the limit column on the light guide plate is embedded in the limit through hole of the middle frame, which can further fix the light guide plate, so that the dual-screen side-entry backlight module has a better display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 A schematic diagram of the structure of a dual-screen edge-entry backlight module according to an embodiment;

[0022] Figure 2 A schematic diagram of the structure of a dual-screen edge-entry backlight module according to an embodiment;

[0023] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at B in the middle;

[0025] Figure 5 A schematic diagram of the structure of a dual-screen edge-entry backlight module according to an embodiment;

[0026] Figure 6 for Figure 5 Schematic diagram of the enlarged structure at point C in the middle.

[0027] In the accompanying drawings, 10, dual-screen side-entry backlight module; 100, bottom plate; 110, mounting slot; 120, connecting slot; 200, reflective film; 300, light guide plate; 310, limiting boss; 320, limiting column; 400, middle frame; 410, limiting through hole; 500, elastic limiting block; 510, interference protrusion; 600, foam adhesive layer. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] In one embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a dual-screen edge-entry backlight module 10 includes: a bottom plate 100, two reflective films 200, two light guide plates 300 and two middle frames 400, the bottom plate 100 is provided with two installation grooves 110 at intervals, each of the installation grooves 110 is provided with an elastic stop block 500, the first side of the elastic stop block 500 is connected to the side wall of the first side of the installation groove 110, each of the reflective films 200 is provided in one of the installation grooves 110, each of the light guide plates 300 is provided in one of the installation grooves 110, the first surface of the light guide plate 300 is connected to the reflective film 200 0 interval arrangement, a limiting column 320 is arranged on the second surface of the light guide plate 300, the first side of the light guide plate 300 abuts against the second side of the elastic limiting block 500, a limiting boss 310 is arranged on the second side of the light guide plate 300, the limiting boss 310 abuts against the side wall of the second side of the mounting groove 110, the middle frame 400 is buckled on the bottom plate 100, each of the middle frames 400 is movably abutted against the edges of the four sides of a light guide plate 300, a limiting through hole 410 is provided on the middle frame 400, and the limiting column 320 is embedded in the limiting through hole 410.

[0031] In the present embodiment, the first side of the light guide plate 300 abuts against the elastic limit block 500 on the first side of the mounting groove 110, and the second side of the light guide plate 300 is the side of the light guide plate 300 facing the lamp bead, that is, the second side of the light guide plate 300 is the light incident side, and a limiting boss 310 is arranged on the second side of the light guide plate 300, and the limiting boss 310 abuts against the side wall of the second side of the mounting groove 110, so that a distance can be set between the second side of the light guide plate 300 and the lamp bead, ensuring a safe distance from the sawtooth of the light guide plate 300 to the lamp bead, and preventing the heat generated by the lamp bead when working, which causes the light guide plate The serrations of 300 become yellow or deformed, so that the light guide plate 300 can be installed in the installation groove 110 by interference fit, the edges of the middle frame 400 are in contact with the edges of the light guide plate 300, and the limiting posts 320 on the light guide plate 300 are embedded in the limiting through holes 410 of the middle frame 400, which can limit the movement of the light guide plate 300 in the X-axis, Y-axis and Z-axis directions, and can play the role of limiting the light guide plate 300. The light guide plate 300 can be stably installed on the base plate 100, so that the dual-screen side-entry backlight module 10 has a better display effect.

[0032] In this embodiment, the reflective film 200 is arranged in the mounting groove 110 and connected to the bottom side wall of the mounting groove 110. The light guide plate 300 is installed in the mounting groove 110 in an interference fit manner through the limiting boss 310 and the elastic limiting block 500, and the first surface of the light guide plate 300 is spaced apart from the reflective film 200, that is, the light guide plate 300 and the reflective film 200 are designed separately, which is beneficial to improving the thermodynamic properties of the light guide plate 300 and can avoid the light guide plate 300 from experiencing thermal expansion and contraction, arching, fracture and other adverse conditions, thereby ensuring the overall reliability of the dual-screen edge-entry backlight module 10.

[0033] In one embodiment, Figure 3 As shown, an interference protrusion 510 is provided on the second side of the elastic limit block 500, and the interference protrusion 510 abuts against the first side of the light guide plate 300. Specifically, the cross-sectional shape of the elastic limit block 500 is L-shaped, and the number of the interference protrusions 510 is set to two or more, and each interference protrusion 510 is evenly distributed on the second side of the elastic limit block 500. The interference protrusion 510 is provided on the L-shaped elastic limit block 500 and is interference-fitted with the light guide plate 300, which can not only realize the limiting and fixing of the light guide plate 300 and avoid the light guide plate 300 from loosening and making abnormal noises, but also further avoid the light guide plate 300 from expanding, shrinking, bulging, and other undesirable phenomena through the design of the interference amount.

[0034] In one embodiment, the elastic limit block 500 and the interference protrusion 510 are integrally structured. Specifically, the elastic limit block 500 is made of silicone or rubber, and the interference protrusion 510 can be made of silicone or rubber accordingly. The elastic limit block 500 and the interference protrusion 510 are integrally formed, which can enhance the structural strength of the elastic limit block 500 and the interference protrusion 510, and can better interfere with the light guide plate 300 to achieve the limit fixation of the light guide plate 300.

[0035] In one embodiment, the dual-screen side-entry backlight module 10 further includes: a flexible circuit board, the flexible circuit board is arranged on the side wall of the second side of the mounting groove 110, and the flexible circuit board is aligned with the second side of the light guide plate 300, and a plurality of lamp beads are arranged on one side of the flexible circuit board facing the light guide plate 300. Specifically, the lamp beads are evenly distributed on the flexible circuit board, and the lamp beads are electrically connected to the flexible circuit board. After power is turned on, the lamp beads on the flexible circuit board emit light beams that enter from the light incident side of the light guide plate 300, and then are evenly distributed on the light guide plate 300 to achieve lighting display.

[0036] In one embodiment, the dual-screen side-entry backlight module 10 further includes: an optical film assembly, the optical film assembly is arranged on the second surface of the light guide plate 300, and the optical films of the optical film assembly are provided with limit clamps, and the limit posts 320 are engaged in the limit clamps. Specifically, the optical film of the optical film assembly is a film that can enhance or improve the optical effect of the light guide plate 300. For example, the optical film is a diffuser film, which can diffuse and propagate the light scattering transmitted from the light guide plate 300. By expanding the diffusion angle, the problem of uneven brightness can be overcome and uniform surface light source emission can be achieved. For another example, the optical film is a light-enhancing film, which can gather the scattered light transmitted by the diffuser film in the front direction, can further homogenize the light source and correct the light source, and play a role in improving the brightness. The optical films of the optical film assembly are sequentially stacked on the second surface of the light guide plate 300, which can compositely enhance the optical effect of the light guide plate 300. At the same time, by providing limit ears on each optical film, the limit posts 320 on the light guide plate 300 are engaged in the limit ears, so that each optical film of the optical film assembly can be limited and fixed, and displacement of the optical film can be avoided.

[0037] In one embodiment, Figure 5 As shown, the dual-screen edge-entry backlight module 10 further includes: a foam adhesive layer 600, which is disposed on the middle frame 400 and seals the position-limiting through hole 410. Specifically, the shape of the foam adhesive layer 600 is adapted to the shape of the middle frame 400, and the foam adhesive layer 600 is attached to the surface of the middle frame 400, and can seal the position-limiting through hole 410, thereby preventing foreign matter from entering the dual-screen edge-entry backlight module 10 through the position-limiting through hole 410 and affecting its display effect.

[0038] In one embodiment, Figure 3 As shown, a connection groove 120 is provided at the bottom of the installation groove 110, and the elastic limit block 500 is arranged in the connection groove 120. Specifically, the elastic limit block 500 is arranged in the connection groove 120 on the bottom side wall of the installation groove 110, and an adhesive layer is arranged on the side wall of the connection groove 120, the first surface of the adhesive layer is connected to the side wall of the connection groove 120, and the second surface of the adhesive layer is connected to the elastic limit block 500, so that the elastic limit block 500 can be stably fixed in the installation groove 110.

[0039] The utility model also provides a display device, including the dual-screen side-entry backlight module 10 described in any of the above embodiments. In this embodiment, the display device is a liquid crystal panel, and the display device also includes a circuit board, a liquid crystal display screen, and an outer frame. The dual-screen side-entry backlight module 10 is arranged on the circuit board, and is installed and fixed on the circuit board through mounting feet and fixing feet. The liquid crystal display screen is fixed on the dual-screen side-entry backlight module 10, and the outer frame is arranged around the outside of the dual-screen side-entry backlight module 10. It should be understood that the display device may also include other components, which are not described here in a cumbersome manner.

[0040] Compared with the prior art, the utility model has at least the following advantages:

[0041] The utility model provides a dual-screen side-entry backlight module, wherein the first side of the light guide plate is in contact with the elastic limit block on the first side of the mounting groove, and a limit boss is provided on the second side of the light guide plate, and the limit boss is in contact with the side wall of the second side of the mounting groove, so that the light guide plate can be installed in the mounting groove by interference fit and can be stably installed on the bottom plate. At the same time, when the middle frame is buckled on the bottom plate, the limit column on the light guide plate is embedded in the limit through hole of the middle frame, which can further fix the light guide plate, so that the dual-screen side-entry backlight module has 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 dual-screen side-entry backlight module, characterized in that: include: A bottom plate, wherein two installation grooves are arranged at intervals on the bottom plate, and an elastic limit block is arranged in each installation groove, and a first side of the elastic limit block is connected to a side wall of the first side of the installation groove; Two reflective films, each of which is disposed in one of the mounting grooves; Two light guide plates, each of which is arranged in one of the mounting grooves, the first surface of the light guide plate is spaced from the reflective film, a limiting column is arranged on the second surface of the light guide plate, the first side of the light guide plate abuts against the second side of the elastic limiting block, a limiting boss is arranged on the second side of the light guide plate, and the limiting boss abuts against the side wall of the second side of the mounting groove; Two middle frames, the middle frames are buckled on the bottom plate, each of the middle frames is movably abutted against the edges of the light guide plate, and the middle frames are provided with limiting through holes, and the limiting posts are embedded in the limiting through holes.

2. The dual-screen edge-entry backlight module according to claim 1, characterized in that: An interference protrusion is arranged on the second side of the elastic limiting block, and the interference protrusion abuts against the first side of the light guide plate.

3. The dual-screen edge-entry backlight module according to claim 2, characterized in that: The number of the interference protrusions is set to two or more.

4. The dual-screen edge-entry backlight module according to claim 1, characterized in that: Also includes: A flexible circuit board is arranged on the side wall of the second side of the mounting groove, and the flexible circuit board is aligned with the second side of the light guide plate. A plurality of lamp beads are arranged on a surface of the flexible circuit board facing the light guide plate.

5. The dual-screen edge-entry backlight module according to claim 1, characterized in that: Also includes: The optical film assembly is arranged on the second surface of the light guide plate. The optical film of the optical film assembly is provided with a limit clamping ear, and the limit column is clamped in the limit clamping ear.

6. The dual-screen edge-entry backlight module according to claim 1, characterized in that: Also includes: A foam adhesive layer is disposed on the middle frame, and the foam adhesive layer seals the limiting through hole.

7. The dual-screen edge-entry backlight module according to claim 1, characterized in that: The cross-section of the elastic limiting block is L-shaped.

8. The dual-screen edge-entry backlight module according to claim 1, characterized in that: A connecting groove is provided at the bottom of the installation groove, and the elastic limiting block is arranged in the connecting groove.

9. The dual-screen edge-entry backlight module according to claim 8, characterized in that: An adhesive layer is arranged on the side wall of the connecting groove, a first surface of the adhesive layer is connected to the side wall of the connecting groove, and a second surface of the adhesive layer is connected to the elastic limiting block.

10. A display device, characterized in that: It comprises the dual-screen edge-entry backlight module described in any one of claims 1-9.

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