Backlight module structure capable of improving light extraction efficiency

Abstract

The utility model discloses a backlight module structure capable of improving light extraction efficiency. The backlight module structure mainly solves the problem that light output of the whole module is reduced due to light energy loss of an existing LED backlight module. The backlight module structure comprises a PCB (printed circuit board), a rubber coating protective layer, a backlight lens and a plurality of first reflective microstructures, wherein the rubber coating protective layer is coated on the PCB and is provided with at least one lamp hole for exposing an LED; the backlight lens is buckled on the lamp hole in the rubber coating protective layer; the first reflective microstructures are arranged on the inner surface of the backlight lens; wherein the number of the backlight lenses is consistent with that of the lamp holes. Through the design, the overall light emitting efficiency of the module is improved; meanwhile, as many microstructures can reflect light, when the light reflected by the microstructures reaches the front light spot area, the light mixing effect can be achieved, and improvement of the color difference of light spots is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of LED backlight modules, and in particular relates to a backlight module structure capable of improving light output efficiency. Background Art

[0002] LED backlight modules have been widely used in the field of advertising light box lighting. The current common practice is to wrap the single backlight lens or the conjoined backlight lens with a plastic coating to encapsulate the lens, PCBA board and wire.

[0003] For a single lens encapsulation process module, due to the reflection effect of the white colloid, part of the light emitted from the secondary lens is reflected back to the lens by the white colloid and then reflected to the front of the light box through the PCB board and the lens. Another part is directly reflected by the colloid surface protruding from the module surface to the light-emitting surface of the light box. The consequence of this is that there will be a very bright spot in the center of the light spot, which is also very unfavorable for the final application. In addition, after being reflected back to the lens by the white colloid and reflected by the PCB, due to multiple reflections, the light energy is lost, resulting in a decrease in the overall light output of the module. Utility Model Content

[0004] The utility model aims to provide a backlight module structure capable of improving light output efficiency, mainly to solve the problem of reduced overall light output of the module caused by light energy loss in the existing LED backlight module.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A backlight module structure capable of improving light output efficiency comprises a PCB board, a rubber-coated protective layer coated on the PCB board and having at least one lamp hole reserved for exposing an LED, a backlight lens snapped onto the lamp hole on the rubber-coated protective layer, and a plurality of first reflective microstructures arranged on the inner surface of the backlight lens; wherein the number of the backlight lenses is consistent with the number of the lamp holes.

[0007] Furthermore, in the present invention, when a plurality of lamp holes are reserved, a plurality of the backlight lenses are integrally formed on the same flat plate; and a plurality of second reflective microstructures are arranged at the bottom of the flat plate.

[0008] Furthermore, in the present invention, the PCB board covered by the backlight lens is provided with black silk screen.

[0009] Furthermore, in the present invention, the percentage of the black silk screen printing in the entire lens area is 35% to 60%.

[0010] Furthermore, in the present invention, the first reflective microstructure and the second reflective microstructure are composed of a plurality of regular or irregular concave-convex structures.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] (1) The utility model arranges a plurality of regular or irregular reflective microstructures on the inner surface of the backlight lens and the bottom of the connecting plate of the conjoined lens. When the light entering the backlight lens and the plate propagates inside and encounters the reflective microstructures, the light can be directly reflected out of the light guide plate, thereby improving the overall light output efficiency of the module. At the same time, because many microstructures reflect light, when the light reflected by these microstructures reaches the front light spot area, it can play a role in mixing light, which is beneficial to improving the color difference of the light spot.

[0013] (2) The utility model achieves the purpose of eliminating the bright spot in the center of the light spot by adjusting the percentage of the black silk screen in the backlight lens area to the entire lens area. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the explosion structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the inner structure of the backlight lens in the utility model.

[0016] The names corresponding to the reference numerals are:

[0017] 1-PCB board, 2-rubber protective layer, 3-lamp hole, 4-backlight lens, 5-first reflective microstructure, 6-flat plate, 7-second reflective microstructure. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0019] Example

[0020] like Figure 1 , 2As shown, the utility model discloses a backlight module structure capable of improving light extraction efficiency, comprising a PCB board 1, a rubber-coated protective layer 2 coated on the PCB board 1 and reserved with at least one lamp hole 3 for LED exposure, a backlight lens 4 buckled on the lamp hole 3 on the rubber-coated protective layer 2, and a plurality of first reflective microstructures 5 arranged on the inner surface of the backlight lens 4; wherein, the number of the backlight lenses 4 is the same as the number of the lamp holes 3. The first reflective microstructure 5 is composed of a plurality of regular or irregular concave-convex structures. When the light entering the backlight lens encounters such a reflective microstructure when propagating inside, this part of the light can be directly reflected out of the light guide plate, thereby improving the overall light extraction efficiency of the module; at the same time, because many microstructures can reflect light, when the light reflected by these microstructures reaches the front spot area, it can play a role of mixing light, which is conducive to improving the color difference of the spot; further, when such a module is assembled inside a light box or a font, its reflective microstructure can also reflect part of the light propagating inside the light box or the font, thereby improving the overall light extraction efficiency of the light box or the font.

[0021] In this embodiment, when a plurality of lamp holes 3 are reserved, a plurality of backlight lenses 4 are integrally formed on the same flat plate 6; a plurality of second light-reflecting microstructures 7 are arranged at the bottom of the flat plate 6. The light entering the flat plate is also reflected and propagated in the second light-reflecting microstructures 7 on the upper flat plate, thereby improving the light extraction efficiency of the backlight module of the conjoined lens.

[0022] Since the backlight module is equipped with a backlight lens, its light output angle is large, generally above 160°, so the irradiation area is large. During the production and manufacturing of the backlight module, especially the encapsulated module, after the encapsulation process, there will be a bright spot in the center of the light spot due to the reflection of the colloid. The PCB board 1 covered by the backlight lens 4 is equipped with a black silk screen. Therefore, this embodiment achieves the purpose of eliminating the bright spot in the center of the light spot by adjusting the percentage of the black silk screen in the backlight lens area to the entire lens area; wherein the percentage of the black silk screen in the entire lens area is 35% to 60%.

[0023] Through the above design, the utility model improves the overall light output efficiency of the module; at the same time, because many microstructures reflect light, when the light reflected by these microstructures reaches the front spot area, it can play a role in mixing light, which is conducive to improving the color difference of the spot. Therefore, compared with the prior art, the utility model has substantial characteristics and progress.

[0024] The above embodiment is only one of the preferred implementation modes of the present utility model and should not be used to limit the protection scope of the present utility model. Any changes or modifications that are made to the main design concept and spirit of the present utility model without any substantive significance, as long as the technical problems solved are still consistent with the present utility model, should be included in the protection scope of the present utility model.

Claims

1. A backlight module structure capable of improving light extraction efficiency, characterized in that: The invention comprises a PCB board (1), a rubber-coated protective layer (2) coated on the PCB board (1) and having at least one lamp hole (3) reserved for exposing an LED, a backlight lens (4) buckled on the lamp hole (3) on the rubber-coated protective layer (2), and a plurality of first reflective microstructures (5) arranged on the inner surface of the backlight lens (4); wherein the number of the backlight lenses (4) is the same as the number of the lamp holes (3).

2. A backlight module structure capable of improving light extraction efficiency according to claim 1, characterized in that: When a plurality of lamp holes (3) are reserved, a plurality of the backlight lenses (4) are integrally formed on the same flat plate (6); and a plurality of second light-reflecting microstructures (7) are arranged at the bottom of the flat plate (6).

3. A backlight module structure capable of improving light extraction efficiency according to claim 2, characterized in that: The PCB board (1) covered by the backlight lens (4) is provided with black silk screen printing.

4. A backlight module structure capable of improving light extraction efficiency according to claim 3, characterized in that: The percentage of the black silk screen printing in the entire lens area is 35% to 60%.

5. A backlight module structure capable of improving light extraction efficiency according to claim 4, characterized in that: The first light-reflecting microstructure (5) and the second light-reflecting microstructure (7) are composed of a plurality of regular or irregular concave-convex structures.

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