Thin backlight module

Abstract

The utility model discloses a thin backlight module which comprises a support, a shading reflecting film, a light-emitting strip, a light guide plate and a diffusion film assembly. The bracket is a plastic part and comprises a supporting plate part; the periphery of the top of the supporting plate part extends upwards to form a front wall, a left wall, a rear wall and a right wall, and a light bar fixing groove is formed in the position, close to the front wall, of the supporting plate part in a downwards-concave mode; foot pads extend downwards from the periphery of the bottom of the bearing plate part, and a containing cavity located below the bearing plate part is defined by the foot pads. The light-emitting strip comprises a strip-shaped base body and a plurality of lamp beads, and the strip-shaped base body is embedded into the lamp strip fixing groove. The shading reflecting film is arranged above the supporting plate part, the light guide plate is located above the shading reflecting film, and the diffusion film assembly is located above the light guide plate. Therefore, the mounting, positioning and assembling of the parts borne by the bracket are convenient, the bracket is suitable for full automation, the supporting plate part and the foot pad play a role in reinforcing the bracket structure, and the accommodating cavity provides a space for the assembly of the mounting scene, so that the whole structure is more compact and thinner.

Description

Technical Field

[0001] The utility model relates to the field of backlight modules, in particular to a thin backlight module. Background Art

[0002] The backlight module is one of the key components of the LCD screen. The backlight module can provide light source for the LCD screen and also play the main supporting and protective role.

[0003] A common backlight module includes a plastic middle frame and a metal bottom frame. The metal bottom frame is snap-fitted to the bottom of the plastic middle frame. The plastic middle frame and the metal bottom frame form an internal space to install and position accessories such as a light guide plate, light strip, diffusion film, and reflective film.

[0004] In the development process of backlight modules, technical personnel in the industry consider eliminating the metal bottom frame to meet the development needs of thinner and lighter products. For example, CN 105093684 A discloses a backlight source, a display panel and a display device, which eliminate the metal back plate in the hope of reducing the thickness of the backlight source. At the same time, a grounding lead is set on the flexible circuit board FPC of the backlight source, and the reflector is set as a conductive reflector. The static electricity of the conductive reflector is then guided to the grounding lead through conductive glue, and the static electricity is guided out by the grounding lead, thereby improving the anti-static ability of the backlight source, avoiding malfunction of the backlight source due to static electricity damage, and preventing static electricity from damaging the display panel.

[0005] However, in actual production and application, this kind of plastic frame structure with surrounding frame walls is not ideal for the installation and positioning of accessories such as reflectors, light guide plates, and diffusers. Without the metal backplane, the installation and positioning reliability and assembly convenience are particularly deficient, making it difficult to adapt to fully automated production. Moreover, such a backlight source is installed as a whole and applied to electronic products, and its structural strength is not ideal, which is also more troublesome in subsequent installation and application. Especially for car-mounted display screens, the requirements for their ability to withstand shaking are high, making them even more difficult to apply. Therefore, up to now, the more common backlight module is still the mainstream structure of a plastic middle frame and a metal bottom frame.

[0006] Therefore, it is necessary to study a new technical solution to solve the above problems. Utility Model Content

[0007] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a thin backlight module, which eliminates the metal frame and uses a bracket to carry the installation and positioning of various accessories. It is easy to assemble and suitable for full automation. The supporting plate and the foot pads serve to strengthen the bracket structure, and the accommodating cavity provides space for the components of the installation scene, making the overall structure more compact and thinner.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A thin backlight module includes a bracket, a light-shielding reflective film, a light-emitting strip, a light guide plate, and a diffusion film assembly;

[0010] The bracket is a plastic part, which includes a supporting plate; the top of the supporting plate is provided with surrounding frame walls extending upward, the surrounding frame walls include a front wall, a left wall, a rear wall and a right wall connected in sequence, the supporting plate is provided with a light bar fixing groove concave downwardly adjacent to the front wall, and a through hole is provided at the bottom of the light bar fixing groove; the bottom of the supporting plate is provided with pads extending downwardly, and a receiving cavity is formed between the pads to be located below the supporting plate;

[0011] The light strip comprises a strip-shaped base and a plurality of lamp beads mounted on one side of the strip-shaped base, the strip-shaped base has a connection pin extending downward, and the lamp beads are arranged at intervals along the extending length direction of the strip-shaped base; the strip-shaped base is embedded in the light strip fixing groove, the connection pin passes through the through hole to expose the bottom of the bracket, the lamp beads are located on the supporting plate, and the light-emitting surface of the lamp beads is arranged backward;

[0012] The light-shielding reflective film is arranged above the supporting plate portion, the light guide plate is located above the light-shielding reflective film, and the diffusion film assembly is located above the light guide plate.

[0013] As a preferred solution, a black and white double-sided adhesive tape is attached to the top of the diffusion membrane assembly.

[0014] As a preferred solution, a PET spacer is attached to the top rear area of ​​the black and white double-sided tape.

[0015] As a preferred solution, the inner side of the surrounding frame walls is recessed downward to form a step surface, the diffusion film assembly is positioned on the step surface, and the top height of the light guide plate is flush with or lower than the height of the step surface.

[0016] As a preferred solution, a buckle portion is protrudingly provided on the rear side of the front wall near the top.

[0017] As a preferred solution, a first positioning groove is provided at the rear end of the bottom of the support plate portion corresponding to the downward projection area of ​​the step surface; the first positioning groove passes downward through the accommodating cavity.

[0018] As a preferred solution, the front end of the light guide plate extends forward with a positioning convex portion, and accordingly, the strip-shaped base is provided with an avoidance notch, the lamp beads avoid the avoidance notch, and a second positioning groove is provided on the front wall, and the positioning convex portion passes through the avoidance notch and extends into the second positioning groove. As a preferred solution, the through hole at the bottom of the light bar fixing groove includes a wire hole and a heat dissipation hole, the wiring pin passes through the wire hole, and the heat dissipation hole connects the light bar fixing groove with the outside of the bottom of the bracket.

[0019] Compared with the prior art, the utility model has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that the metal frame is mainly eliminated, and the bracket structure of the plastic parts is cleverly designed to provide a supporting plate, surrounding frame walls, light bar fixing grooves, through holes, pads and a receiving cavity. The bracket carries the installation and positioning of various accessories (light-shielding reflective film, light strip, light guide plate, diffusion film assembly), which is easy to assemble and suitable for full automation. The supporting plate and the pads play a role in strengthening the bracket structure, and the receiving cavity provides space for the components of the installation scene, making the overall structure more compact and thinner.

[0020] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of a thin backlight module according to an embodiment of the utility model;

[0022] Figure 2 It is a rear view of the thin backlight module of the embodiment of the utility model;

[0023] Figure 3 is an exploded view of a thin backlight module according to an embodiment of the utility model;

[0024] Figure 4 yes Figure 1 Cross-section view at AA.

[0025] Description of the accompanying drawings: bracket 1, supporting plate portion 11, light strip fixing groove 111, front wall 12, buckle portion 121, left wall 13, rear wall 14, right wall 15, step surface 16, foot 17, accommodating cavity 18, first positioning groove 19, light-shielding reflective film 2, light strip 3, strip base 31, avoidance gap 31, lamp bead 32, wiring pin 33, light guide plate 4, positioning protrusion 41, diffusion film assembly 5, black and white double-sided tape 6, PET spacer 7. DETAILED DESCRIPTION

[0026] Please refer to Figures 1 to 4 As shown, it shows the specific structure of an embodiment of the utility model.

[0027] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0028] A thin backlight module comprises a bracket 1, a light-shielding reflective film 2 (or a reflective film), a light-emitting bar 3, a light guide plate 4, and a diffusion film assembly 5.

[0029] The bracket 1 is a plastic part, usually a non-transparent plastic part. The bracket 11 includes a support plate portion 11. Figure 3 Taking the direction shown as an example, the support plate 11 is horizontally extended and is in the shape of an integral flat plate; the top of the support plate 11 is surrounded by surrounding frame walls extending upward, and the surrounding frame walls include a front wall 12, a left wall 13, a rear wall 14 and a right wall 15 connected in sequence, and a buckle portion 121 is convexly provided at the rear side of the front wall 12 near the top position, so as to clamp the panel to be installed later. A light bar fixing groove 111 is concave downwardly provided on the support plate 11 adjacent to the front wall 12, and a through hole is provided at the bottom of the light bar fixing groove 111; the inner side of the surrounding frame walls is concave downwardly provided with a step surface 16. The bottom of the support plate portion 11 is provided with feet 17 extending downward, and a receiving cavity 18 is formed between the feet 17 and located below the support plate portion 11; a first positioning groove 18 is provided at the rear end of the bottom of the support plate portion 11 corresponding to the downward projection area of ​​the step surface 16; the first positioning groove 18 passes through the receiving cavity 18 downward, and the receiving cavity 18 is used for receiving and positioning components of the backlight module installation scene, and the first positioning groove 18 can further assist in strengthening the positioning.

[0030] The light strip 3 includes a strip base 31 and a plurality of lamp beads 32 mounted on one side of the strip base 31. The strip base 31 has a connection pin 33 extending downward, and the lamp beads 32 are arranged at intervals along the length direction of the strip base 31. The strip base 31 is embedded in the light strip fixing groove 111, and the connection pin 33 passes through the through hole to expose the bottom of the bracket 1. The lamp beads 32 are located on the support plate 11, and the light-emitting surface of the lamp beads 32 is arranged backward.

[0031] The shading reflective film 2 is arranged above the supporting plate 11, the light guide plate 4 is located above the shading reflective film 2, and a positioning convex portion 41 extends forward from the front end of the light guide plate 4. Accordingly, an avoidance notch 311 is arranged on the strip-shaped base 31, and the lamp beads 32 avoid the avoidance notch 311. A second positioning groove (not shown in the figure) is arranged on the front wall 12, and the positioning convex portion 41 passes through the avoidance notch 311 and extends into the second positioning groove. The diffusion film assembly 5 is located above the light guide plate 4, and the diffusion film assembly 5 is positioned on the step surface 16, and the top height of the light guide plate 4 is flush with or lower than the height of the step surface 16. A black and white double-sided tape 6 is attached to the top of the diffusion film assembly 5, and a PET spacer 7 is attached to the top rear area of ​​the black and white double-sided tape 6, which is a transparent PET sheet.

[0032] It should be noted that when used for vehicle-mounted displays, such as minibuses and buses, the anti-collision requirements are relatively high, and a metal shell can be optionally selected to have an electrostatic shielding effect. Moreover, an anti-static circuit (for example: a grounding circuit is arranged around the strip substrate 31) can be arranged on the circuit board (the strip substrate 31 of the light strip 3 adopts a circuit board structure) to shield static electricity. Therefore, there is no need to worry about the anti-static ability of the backlight module that eliminates the traditional metal frame.

[0033] The design focus of the present invention is that it mainly eliminates the metal frame, and cleverly designs the structure of the bracket 1 of the plastic part to provide a supporting plate portion 11, surrounding frame walls, a light bar fixing groove 111, a through hole, a pad 17 and a receiving cavity 18. The bracket 1 carries the installation and positioning of various accessories (shading reflective film 2, light bar 3, light guide plate 4, diffusion film assembly 5), which is easy to assemble and suitable for full automation. The supporting plate portion 11 and the pad 17 play a role in strengthening the structure of the bracket 1, and the receiving cavity 18 provides space for components of the installation scene, making the overall structure more compact and thinner.

[0034] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A thin backlight module, comprising a bracket, a light-shielding reflective film, a light-emitting strip, a light guide plate, and a diffusion film assembly, characterized in that: The bracket is a plastic part, which includes a supporting plate; the top of the supporting plate is provided with surrounding frame walls extending upward, the surrounding frame walls include a front wall, a left wall, a rear wall and a right wall connected in sequence, the supporting plate is provided with a light bar fixing groove concave downwardly adjacent to the front wall, and a through hole is provided at the bottom of the light bar fixing groove; the bottom of the supporting plate is provided with pads extending downwardly, and a receiving cavity is formed between the pads to be located below the supporting plate; The light strip comprises a strip-shaped base and a plurality of lamp beads mounted on one side of the strip-shaped base, the strip-shaped base has a connection pin extending downward, and the lamp beads are arranged at intervals along the extending length direction of the strip-shaped base; the strip-shaped base is embedded in the light strip fixing groove, the connection pin passes through the through hole to expose the bottom of the bracket, the lamp beads are located on the supporting plate, and the light-emitting surface of the lamp beads is arranged backward; The light-shielding reflective film is arranged above the supporting plate portion, the light guide plate is located above the light-shielding reflective film, and the diffusion film assembly is located above the light guide plate.

2. The thin backlight module according to claim 1, characterized in that: A black and white double-sided adhesive tape is attached to the top of the diffusion membrane assembly.

3. The thin backlight module according to claim 2, characterized in that: A PET spacer is attached to the top rear area of ​​the black and white double-sided tape.

4. The thin backlight module according to claim 1, characterized in that: The inner side of the surrounding frame wall is concave downward to form a step surface, the diffusion film assembly is positioned on the step surface, and the top height of the light guide plate is flush with or lower than the height of the step surface.

5. The thin backlight module according to claim 1, characterized in that: A buckle portion is protrudingly provided on the rear side of the front wall near the top.

6. The thin backlight module according to claim 4, characterized in that: A first positioning groove is provided at the rear end of the bottom of the support plate portion corresponding to the downward projection area of ​​the step surface; the first positioning groove passes through the accommodating cavity downward.

7. The thin backlight module according to claim 1, characterized in that: A positioning protrusion extends forward from the front end of the light guide plate. Correspondingly, an avoidance notch is provided on the strip-shaped base, and the lamp beads avoid the avoidance notch. A second positioning groove is provided on the front wall, and the positioning protrusion passes through the avoidance notch and extends into the second positioning groove.

8. The thin backlight module according to claim 1, characterized in that: The through hole at the bottom of the light bar fixing groove includes a wire passing hole and a heat dissipation hole, the connection pin passes through the wire passing hole, and the heat dissipation hole connects the light bar fixing groove with the outside of the bottom of the bracket.

Images