LED backlight source module

Abstract

The utility model relates to the technical field of LEDs, in particular to an LED backlight source module which comprises a lower iron frame, a rubber frame, a light guide plate, a lower diffusion sheet, an upper brightness enhancement sheet, a lower brightness enhancement sheet and an FOB which are sequentially pasted to form a combined body. The rubber frame is of a rectangular frame type structure, the annular end of one side of the rubber frame is bent to form an annular supporting structure, the rubber frame is installed in the lower iron frame, the supporting structure is arranged on the inner side wall of the lower iron frame, and the combined body is placed in an area defined by the annular structure of the rubber frame. The outer side face of the light guide plate is opposite to the supporting structure of the rubber frame. Compared with a traditional LED backlight source module, the thickness of the LED backlight source module is reduced on the premise that optical indexes including brightness, uniformity and other optical performance are not affected, auxiliary assembling of a jig is not needed, and the manufacturing process is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of LEDs, in particular to an LED backlight source module. Background Art

[0002] The traditional LED backlight module is composed of a lower iron frame, a rubber frame, a light guide plate, a reflective film, a lower diffuser, upper and lower light enhancements, a light-shielding glue, FOB, etc. Its assembly method is relatively complicated, and auxiliary jigs are required during the production process.

[0003] In addition, the plastic frame needs to press the light guide plate at least 0.5mm, resulting in a larger size of the light guide plate; and the plastic frame retaining wall of the traditional backlight module needs to exceed the surface of the film material by about 0.2mm (design specification). If the plastic frame retaining wall is not higher than the surface of the film material, undesirable phenomena such as film shifting are likely to occur during the assembly process. Therefore, the Z-direction gap from the polarizer under the FOB to the surface of the light guide plate is 0.69mm, and the actual film stack thickness is 0.51mm. This is the key point that the thickness of the traditional backlight module cannot be reduced; and because the distance between the film edge and the module AA viewing area is only 1.27mm, it is necessary to add light-shielding glue to deal with the effect on the four sides of the viewing area.

[0004] The traditional LED backlight module assembly method includes: processing the lower iron frame with fixing glue, reflective strips, etc. → installing the light guide plate assembly (light guide plate + light strip + reflector) → assembling the glue frame → placing the film → pasting the shading glue → assembling the FOB → pasting the edge glue; a total of 7 steps are required, and the assembly of the light guide plate and the pasting of the shading glue require the assistance of positioning fixtures, there are many types of materials, the process is relatively complicated, and the labor cost is high. Utility Model Content

[0005] To solve the above problems, the utility model proposes an LED backlight module, which has a reduced thickness compared to traditional LED backlight modules without affecting optical indicators, including brightness, uniformity and other optical properties, and does not require jig-assisted assembly, and has a simple manufacturing process.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] An LED backlight module comprises a lower iron frame, a plastic frame, a light guide plate, a lower diffusion sheet, an upper brightness enhancement sheet, a lower brightness enhancement sheet and a FOB, wherein the light guide plate, the lower diffusion sheet, the lower brightness enhancement sheet, the upper brightness enhancement sheet and the FOB are sequentially pasted to form a combination;

[0008] The rubber frame has a rectangular frame structure, and one side of the rubber frame has an annular end portion bent to form an annular support structure. The rubber frame is installed in the lower iron frame, and the support structure is attached to the inner wall of the lower iron frame. The assembly is placed in the area enclosed by the annular structure of the rubber frame, and the outer side surface of the light guide plate is opposite to the support structure of the rubber frame.

[0009] Preferably, a surface of the support structure facing away from the lower iron frame is higher than a surface of the light guide plate facing away from the lower iron frame.

[0010] Preferably, the distance between the surface of the supporting structure facing away from the lower iron frame and the surface of the light guide plate facing away from the lower iron frame is 0.10 mm-0.20 mm.

[0011] Preferably, a surface of the support structure facing away from the lower iron frame is 0.15 mm higher than a surface of the light guide plate facing away from the lower iron frame.

[0012] Preferably, the distance between the surface of the upper brightness enhancement sheet on the side facing away from the light guide plate and the light guide plate is 0.45 mm-0.55 mm.

[0013] Preferably, the distance from the surface of the upper brightness enhancement sheet facing away from the light guide plate to the light guide plate is 0.51 mm.

[0014] The beneficial effects of using the utility model are:

[0015] In this LED backlight module, the supporting structure is attached to the inner wall of the lower iron frame, and the assembly is placed in the area enclosed by the annular structure of the rubber frame. The outer side of the light guide plate is opposite to the supporting structure of the rubber frame. The rubber frame does not need to press the light guide plate, and the size of the light guide plate is relatively reduced. The light guide plate needs to be 0.15mm higher than the supporting surface of the light guide plate to prevent protrusion from the surface of the light guide plate and cause warping of the edge of the film material. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a partial cross-sectional view of the LED backlight module of the utility model.

[0017] Figure 2 It is a front schematic diagram of the LED backlight module of the utility model.

[0018] Figure 3 It is a schematic diagram of the partial dimensions of the LED backlight module of the utility model.

[0019] Figure 4 This is a schematic diagram of the installation process of the LED backlight module of the utility model.

[0020] Reference numerals include:

[0021] 1-lower iron frame, 2-plastic frame, 21-plastic frame body, 22-support structure, 3-reflective film, 4-light guide plate, 5-lower diffuser, 6-lower brightness enhancement sheet, 7-upper brightness enhancement sheet, 8-FOB, 9-viewing area;

[0022] A-the distance from the light guide plate to the outer surface of the lower iron frame, B-the total thickness, C-the distance from the upper light enhancement sheet to the light guide plate, D-the distance from the surface of the light guide plate above the support surface of the rubber frame, and E-the coverage area. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the technical solution more clear, the technical solution is further described in detail below in conjunction with specific implementation methods. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the technical solution.

[0024] like Figure 1-Figure 4 As shown, the LED backlight module proposed in this embodiment includes a lower iron frame 1, a plastic frame 2, a light guide plate 4, a lower diffuser 5, an upper brightening sheet 7, a lower brightening sheet 6 and an FOB8, wherein the light guide plate 4, the lower diffuser 5, the lower brightening sheet 6, the upper brightening sheet 7 and the FOB8 are pasted in sequence to form an assembly; the plastic frame 2 has a rectangular frame structure, and one side annular end of the plastic frame body 21 is bent to form an annular support structure 22, the plastic frame 2 is installed in the lower iron frame 1, and the support structure 22 is attached to the inner side wall of the lower iron frame 1, and the assembly is placed in the area enclosed by the annular structure of the plastic frame 2, and the outer side surface of the light guide plate 4 is opposite to the support structure 22 of the plastic frame 2.

[0025] The plastic frame 2 installed on the inner side of the lower iron frame 1 is a frame structure. The reflective film 3 is first pasted on the inner main extension surface of the lower iron frame 1 and in the area enclosed by the supporting structure 22. Then the combination formed by the light guide plate 4, the lower diffuser 5, the lower brightness enhancement film 6, the upper brightness enhancement film 7 and the FOB 8 is installed on the reflective film 3.

[0026] The plastic frame 2 does not need to press the light guide plate 4, the size of the light guide plate 4 is relatively reduced, and the light guide plate 4 needs to be higher than the support surface of the light guide plate 4, that is, 0.15mm higher than the surface of the support structure 22 facing away from the lower iron frame 1, to prevent the edge of the film material from warping due to protruding from the surface of the light guide plate 4.

[0027] Because the plastic frame 2 does not need to add film material grooves, in the actual thickness direction, the distance from the surface of the upper brightness enhancement sheet 7 facing away from the light guide plate 4 to the light guide plate 4 is 0.51mm. After this adjustment, the thickness of the new structure will be about 0.2mm thinner than the traditional backlight module.

[0028] Because the film material slot is equivalent to the FOB8 slot, the film material is relatively enlarged, and the distance between the edge of the film material and the viewing area 9 is increased to 2.1mm, that is, the width of the covering area E is increased to 2.1mm. Therefore, there is no need to attach shading glue to the four sides of the viewing area 9 to improve the edge effect.

[0029] Specifically, in the LED backlight module in this embodiment, the distance A from the light guide plate to the outer surface of the lower iron frame is 1.98 mm, the total thickness B of the LED backlight module is 2.62 mm, the distance C from the upper light enhancement sheet to the light guide plate is 0.51 mm, and the distance D between the surface of the light guide plate and the support surface of the rubber frame is 0.15 mm.

[0030] In addition, there are also improvements in the installation method of the LED backlight module, as follows.

[0031] The traditional LED backlight module assembly method is: process the lower iron frame 1 with fixing glue, reflective strips, etc. → install the light guide plate 4 components (light guide plate 4 + light strip + reflector) → assemble the glue frame 2 → place the film → paste the shading glue → assemble FOB8 → paste the edge glue; a total of 7 steps are required, and the assembly of the light guide plate 4 and the shading glue require positioning fixtures to assist in assembly, there are many types of materials, the process is relatively complicated, and the labor cost is high.

[0032] The LED backlight module in the present embodiment is assembled as follows: the lower iron frame 1 is processed with fixing glue, reflective strips, etc. → the glue frame 2 is assembled → the light guide plate assembly (light guide plate 4 + light strip + reflector) is installed → the membrane is placed → FOB8 is assembled → the edge glue is affixed; only 6 steps are required, and the assembly of the light guide plate 4 and the affixing of the shading glue do not require the auxiliary assembly of positioning jigs; compared with the traditional LED backlight module, the new LED backlight module has low material cost, simpler process, high production efficiency, low labor cost, lighter and thinner products, and more convenient rework.

[0033] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present technical content. As long as these changes do not deviate from the concept of the present invention, they all fall within the scope of protection of this patent.

Claims

1. An LED backlight module, characterized in that: It includes a lower iron frame, a plastic frame, a light guide plate, a lower diffuser, an upper brightness enhancement sheet, a lower brightness enhancement sheet and FOB, wherein the light guide plate, the lower diffuser, the lower brightness enhancement sheet, the upper brightness enhancement sheet and FOB are sequentially pasted to form a combination; The rubber frame has a rectangular frame structure, and one side of the rubber frame has an annular end portion bent to form an annular support structure. The rubber frame is installed in the lower iron frame, and the support structure is attached to the inner wall of the lower iron frame. The assembly is placed in the area enclosed by the annular structure of the rubber frame, and the outer side surface of the light guide plate is opposite to the support structure of the rubber frame.

2. The LED backlight module according to claim 1, characterized in that: The surface of the supporting structure facing away from the lower iron frame is higher than the surface of the light guide plate facing away from the lower iron frame.

3. The LED backlight module according to claim 1, characterized in that: The distance between the surface of the supporting structure facing away from the downward iron frame and the surface of the light guide plate facing away from the downward iron frame is 0.10 mm to 0.20 mm.

4. The LED backlight module according to claim 3, characterized in that: The distance between the surface of the supporting structure facing away from the downward iron frame and the surface of the light guide plate facing away from the downward iron frame is 0.15 mm.

5. The LED backlight module according to claim 1, characterized in that: The distance between the surface of the upper brightness enhancement sheet on the side facing away from the light guide plate and the light guide plate is 0.45 mm-0.55 mm.

6. The LED backlight module according to claim 1, characterized in that: The distance between the surface of the upper brightness enhancement sheet facing away from the light guide plate and the light guide plate is 0.51 mm.

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