CN101922648A - Backlight module - Google Patents

Abstract

The invention relates to a backlight module. The backlight module includes a strengthening tape, a light source component and a light guide plate. The reinforcing tape is bent to form a cover body and a supporting part extending from the bottom of the cover body, wherein the cover body has an opening. The light source assembly is pasted on the cover body and located in the cover body. The light guide plate has a light incident surface, a bottom adjacent to the light incident surface, and a light exit surface, part of the bottom surface is opposite to the supporting part, and the light incident surface is located at the opening. When the backlight module is assembled, it can be directly pasted on other components through the cover, which is convenient for assembly. And when rework is required, you only need to tear off the reinforcing tape, without screw locking, which is easy for rework.

Description

Backlight module

technical field

The invention relates to the field of liquid crystal displays, in particular to a backlight module for providing light sources for liquid crystal display panels.

Background technique

Since the liquid crystal display panel does not have self-luminous characteristics, in order to achieve the display effect, the backlight module needs to provide a display light source for the liquid crystal display panel. Backlight modules are divided into direct-lit backlight modules and side-illuminated backlight modules, and FIG. 1 is a schematic diagram of a conventional side-lit backlight module. Please refer to FIG. 1, a conventional side-illuminated backlight module 100 includes a metal lampshade 110, an LED light source 120, a frame 140 for supporting a liquid crystal display panel, a light guide plate 150, a reflector 160 and multiple An optical film 170, wherein the LED light source 120 includes a printed circuit board 122 (printed circuit board, PCB) and a plurality of LEDs 124 electrically connected to the printed circuit board 122 and arranged in a straight line.

The conventional method for assembling the side-illuminated backlight module 100 is to place the LED light source 120 in the metal lampshade 110 first, and then attach the adhesive tape 180 and the adhesive tape 190 . Then, the frame 140 is fixed on the metal lampshade 110 by adhesive tape 190 and screws. Then, the reflective sheet 160 is adhered to the metal lampshade 110 by the adhesive tape 180 , and the light guide plate 150 is adhered by the adhesive tape 180 , wherein the light incident surface 152 of the light guide plate 150 extends into the metal lampshade 110 . After that, the optical film 170 is assembled on the light guide plate 150 .

Based on the above, the conventional side-illuminated backlight module 100 requires screws to lock the frame 140 to the metal lampshade 110 , so the assembly is more troublesome, and the problem of misalignment of the screws may occur, resulting in an increase in the defective rate. In addition, when rework (that is, reassembly) is required, the light guide plate 150 needs to be taken out and the screws are loosened first, so it will take a lot of time. In addition, in the conventional technology, an additional conductive tape is required to be attached to the metal lampshade 110 and a metal back plate, so as to achieve the effect of electric discharge protection.

In view of this, it is necessary to provide a backlight module that is easy to assemble and easy to rework.

Contents of the invention

The purpose of the present invention is to provide a backlight module that is easy to assemble and easy to rework.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions.

A backlight module includes strengthening adhesive tape, a light source component and a light guide plate. The reinforcing tape is bent to form a cover body and a supporting part extending from the bottom of the cover body, wherein the cover body has an opening. The light source assembly is pasted on the cover body and located in the cover body. The light guide plate has a light incident surface, a bottom adjacent to the light incident surface, and a light exit surface, part of the bottom surface is opposite to the supporting part, and the light incident surface is located at the opening.

When the backlight module is in use, it can be directly pasted on other components through the cover, which is convenient for assembly. And when rework is required, it is only necessary to tear off the reinforcing tape first, without loosening the screws and removing the light guide plate. Therefore, the backlight module of the present invention has the advantages of easy assembly and easy rework.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a conventional side-illuminated backlight module.

FIG. 2 is a schematic diagram of a backlight module provided by an embodiment of the present invention.

3A to 3D are flowcharts of assembling the backlight module in FIG. 2 .

4A to 4B are flowcharts of assembling the light source component and the reinforcing tape into a module.

100: side-lit backlight module

110: Metal lampshade 120: LED light source

122: printed circuit board 124: light emitting diode

140: frame light guide plate 150: light guide plate

152: light incident surface 160: reflective sheet

170: Optical film 180: Tape

190: Tape

200: Backlight module

10: Reinforcing Tape

12: Cover body 13: Through hole

14: Support part 16: Opening

20: Light source component 22: Substrate

220: Connection terminal 24: Light source

30: Light guide plate 31: Light incident surface

32: bottom surface 33: light emitting surface

34: Adhesive layer 35: Reflective sheet

36: Optical film 37: Adhesive layer

40: frame

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, characteristics and effects of the backlight module proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. Details are as follows.

FIG. 2 is a schematic diagram of a backlight module provided by an embodiment of the present invention. Referring to FIG. 2 , a backlight module 200 provided by an embodiment of the present invention includes a reinforcing tape 10 , a light source assembly 20 and a light guide plate 30 .

The reinforcing tape 10 is bent to form a cover body 12 and a support portion 14 extending from the bottom of the cover body 12 , wherein the cover body 12 has an opening 16 . The light source assembly 20 is pasted on the cover body 12 and located inside the cover body 12 . The light guide plate 30 has a light incident surface 31 , a bottom surface 32 and a light exit surface 33 adjacent to the light incident surface 31 , part of the bottom surface 32 is opposite to the support portion 14 , and the light incident surface 31 is located at the opening 16 . The light emitting surface 33 is opposite to the bottom surface 32 .

The reinforcing tape 10 must have sufficient strength to support the light source assembly 20 and partially support the light guide plate 30 . Preferably, the reinforcing tape 10 can also have good heat dissipation, so as to dissipate the heat generated by the light source assembly 20 in a timely manner. In this embodiment, the reinforcing tape 10 can be made of aluminum tape.

The light source assembly 20 in FIG. 2 includes a substrate 22 and at least one light source 24 disposed on the substrate 22 . In this embodiment, the light source 24 is, for example, a light emitting diode (Light Emitting Diode, LED), and the number of the light source 24 may be multiple. The light sources 24 are arranged along a straight line, and the straight line is parallel to the light incident surface 31 of the light guide plate 30 . The light emitting direction of the light source 24 is toward the light incident surface 31 of the light guide plate 30 . In addition, part of the substrate 22 extends below the bottom surface 32 of the light guide plate 30 and is pasted on the support portion 14 , and the bottom surface 32 of the light guide plate 30 is pasted on the substrate 22 through an adhesive layer 34 . The substrate 22 is, for example, a printed circuit board (PCB), which includes the connection terminal 220 . The connecting terminal 220 may be a flexible printed circuit board (FPCB) connected to a printed circuit board. Correspondingly, the cover body 12 is formed with a through hole 13 so that the connecting end 220 can pass through the through hole 13 . In this way, the light source 24 can be connected to an external control circuit through the connection terminal 220 to achieve control of the light source 24 .

The above-mentioned light source unit 20 may also use other commonly used light sources, such as cold cathode fluorescent lamps (Cold Cathode Fluorescent Lamp, CCFL). In addition, the design of LED plus light guide rod can also be used, that is, one or more LEDs are arranged at both ends of the light guide rod so that the light emitted by the LED can be converted into a line light source by the light guide rod.

In order to improve the light utilization efficiency of the light guide plate 30 , a reflective sheet 35 can be further disposed on the bottom surface 32 of the light guide plate 30 , and part of the reflective sheet 35 is glued to the supporting portion 14 . In this way, the reflective sheet 35 is supported by the supporting portion 14 , which can prevent it from falling off from the light guide plate 30 . In order to improve the uniformity and luminance of light output from the light guide plate 30 , at least one optical film 36 may be further disposed on the light output surface 33 . The optical film 36 can be a diffusion film, a brightness enhancement film, and the like. In addition, the backlight module 200 may further include a frame 40 for placing the liquid crystal display panel. The top of the cover body 12 is glued to the frame 40 . Part of the light-emitting surface 33 of the light guide plate 30 is adhered to the frame 40 through an adhesive layer 37 .

The assembling steps of the backlight module 200 of this embodiment will be described below with reference to the drawings, but the assembling steps are only for example, and the present invention does not limit the assembling steps of the backlight module 200 . 3A to 3D are flow charts of assembling the backlight module of FIG. 2 , and FIGS. 4A to 4B are flow charts of assembling the light source component and the reinforcing tape into a module. Please refer to FIG. 3A first. The assembly steps of the backlight module 200 are, for example, firstly attaching the adhesive layer 37 to the frame 40 and inserting the reflection sheet 35 .

Next, as shown in FIG. 3B , the light guide plate 30 is inserted, and the frame 40 is bonded to the light guide plate 30 through the adhesive layer 37 .

Afterwards, as shown in FIG. 3C , the module composed of the reinforcing tape 10 and the light source assembly 20 is attached to the reflection sheet 35 , the frame 40 and the light guide plate 30 . The forming method of the module is shown in FIG. 4A and FIG. 4B , that is, the adhesive layer 34 is first formed on the substrate 22 , and then the reinforcing tape 10 is bent along the light source assembly 20 to form the cover body 12 and the support portion 14 .

Then, as shown in FIG. 3D , the optical film 36 is disposed on the light guide plate 30 .

The backlight module 200 of this embodiment replaces the metal lampshade in the prior art with the reinforced adhesive tape 20, which not only saves the cost but also saves the step of sticking the tape on the metal lampshade. Therefore, the backlight module 200 of this embodiment has the advantage of being easy to assemble. In addition, the backlight module 200 of this embodiment does not need to use screws to lock the frame 40 , so the assembly time can be further saved. In addition, when heavy work is required, the reinforcing tape 10 only needs to be torn off, and the reinforcing tape 10 can be pasted back after the heavy work is completed. The backlight module 200 of this embodiment has the advantage of being easy to rework because the rework steps are simple and there is no need to loosen the screws. In addition, in this embodiment, when the metal backplane is combined with the backlight module 200 , it can be directly pasted to the metal backplane by the reinforcing tape 10 to achieve the effect of electrostatic discharge protection.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes, but as long as they do not depart from the technical solution of the present invention, the Technical Essence Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solution of the present invention.

Claims (9)

1. A backlight module, comprising: a reinforcing tape, bent to form a cover body and a support portion extending from the bottom of the cover body, wherein the cover body has an opening; A light source component is pasted on the cover and located in the cover; and A light guide plate has a light incident surface and a bottom surface adjacent to the light incident surface, part of the bottom surface is opposite to the supporting part, and the light incident surface is located at the opening. 2 . The backlight module according to claim 1 , wherein the light source assembly comprises a substrate attached to the bottom of the cover and at least one light source disposed on the substrate. 3 . 3. The backlight module according to claim 2, wherein part of the substrate extends below the bottom surface of the light guide plate and is pasted on the support portion, and the bottom surface of the light guide plate passes through an adhesive layer And paste on the substrate. 4. The backlight module according to claim 2, wherein the substrate comprises a connection end, the cover body is formed with a through hole, and the connection end passes through the through hole. 5 . The backlight module according to claim 1 , further comprising a reflective sheet disposed on the bottom surface of the light guide plate, and part of the reflective sheet is adhered to the supporting portion. 6. The backlight module according to claim 1, wherein the reinforcing tape is an aluminum tape. 7. The backlight module according to claim 1, further comprising a frame for placing the liquid crystal display panel, and part of the frame is pasted on the top of the cover. 8. The backlight module according to claim 7, wherein the frame is further pasted on a light emitting surface of the light guide plate through an adhesive layer. 9. The backlight module according to claim 1, further comprising at least one optical film disposed on a light emitting surface of the light guide plate.

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