Backlight module for improving LED light coupling efficiency

Abstract

The utility model discloses a backlight module capable of improving LED light coupling efficiency, which comprises a backlight module body, the backlight module body comprises a lower iron frame and a rubber frame positioned on the inner side of the lower iron frame, a light guide plate is accommodated in the lower iron frame, a first reflector plate is arranged on one side of the light guide plate, and a second reflector plate is arranged on the other side of the light guide plate. An LED lamp used for providing light is arranged below the light guide plate, and a second reflector plate used for reflecting light on the other side of the LED lamp is arranged at the position, opposite to the LED lamp, of the rubber frame. The backlight module has the effects that the light rays emitted by the side portions of the LED lamps are reflected, the passing amount of the light rays entering the light guide plate is increased, and therefore the brightness of the backlight module body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of backlight modules, in particular to a backlight module capable of improving the light coupling efficiency of LEDs. Background Art

[0002] Liquid crystal display devices are widely used in various information, communication and consumer electronic products. Liquid crystal display modules are mainly composed of backlight modules and liquid crystal display screens. The existing backlight modules include a frame, a light guide plate, an optical film, a reflective sheet, a shading sheet and an LED light source located on the side of the light guide plate. When working, light enters from the side of the light guide plate, is scattered by the light guide plate and reflected by the reflective sheet, and then is emitted from the light emitting surface of the light guide plate. Then, the light passes through the optical film and is emitted from the visible area of ​​the shading sheet to the liquid crystal display screen to provide light for the liquid crystal display screen.

[0003] The largest power consumption of LCD screens in the prior art comes from the LED backlight module. The brightness of the LED backlight module is closely related to the light coupling efficiency of the LED light source. The light emitted by the LED in the backlight module needs to be reflected into the LCD screen through the reflector and the light guide plate. However, part of the light emitted by the LED cannot pass through the reflector and the light guide plate, resulting in a waste of LED light and affecting the brightness of the backlight module. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a backlight module which improves the LED light coupling efficiency.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A backlight module for improving the light coupling efficiency of LEDs, comprising: a backlight module body (10), the backlight module body (10) comprising a lower iron frame (11) and a plastic frame (12) located inside the lower iron frame (11), a light guide plate (20) being arranged inside the lower iron frame (11), a first reflective sheet (30) being arranged on one side of the light guide plate (20), an LED lamp (50) for providing light being arranged below the light guide plate (20), and a second reflective sheet (80) for reflecting light from the other side of the LED lamp (50) being arranged on the plastic frame (12) at a position relative to the LED lamp (50);

[0007] The second reflective sheet (80) is attached to the plastic frame (12), the second reflective sheet (80) is arranged opposite to the lower part of the light guide plate (20) and the upper part of the LED lamp (50), and the second reflective sheet (80) and the first reflective sheet (30) are respectively located on both sides of the light guide plate (20);

[0008] The size of the second reflective sheet (80) is larger than the size of the LED lamp (50);

[0009] An optical film (40) is provided on the light emitting surface of the light guide plate (20); the optical film (40) is located on a side of the light guide plate (20) away from the first reflective sheet (30); the second reflective sheet (80) is located in a space-avoiding area of ​​the plastic frame (12) relative to the optical film (40); and the second reflective sheet (80) is located at the bottom of the plastic frame (12).

[0010] In one embodiment, the first reflective sheet, the LED lamp and the second reflective sheet are all located on the light incident surface of the light guide plate.

[0011] In one embodiment, the first reflective sheet is disposed along the length direction of the light guide plate, and the first reflective sheet is attached to one side of the light guide plate.

[0012] In one embodiment, a double-sided adhesive (90) for bonding is provided between the second reflective sheet (80) and the plastic frame (12).

[0013] In one embodiment, the optical film includes a diffusion film, an upper brightness enhancement sheet and a lower brightness enhancement sheet, and the diffusion film, the lower brightness enhancement sheet and the upper brightness enhancement sheet are sequentially attached to the light emitting surface of the light guide plate.

[0014] In one embodiment, an FPC is disposed on one side of the LED lamp, and the FPC is electrically connected to the LED lamp.

[0015] In one embodiment, the FPC is located on the inner side of the lower iron frame, and a FPC thermal conductive double-sided adhesive is provided between the FPC and the lower iron frame for connection.

[0016] Compared with the prior art, the utility model has at least the following advantages:

[0017] The utility model discloses a backlight module for improving the LED light coupling efficiency by setting a second reflector. Most of the light emitted by the LED lamp is reflected by the first reflector and the light guide plate, and the other part of the light that is not reflected is reflected by the second reflector on the rubber frame to the light guide plate and then enters the liquid crystal display screen through the light guide plate, so as to reduce the light loss of the LED lamp and increase the amount of light passing into the light guide plate, thereby improving the brightness of the backlight module body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0019] Figure 1A schematic diagram of the structure of a backlight module for improving LED light coupling efficiency provided by the utility model;

[0020] Figure 2 for Figure 1 Enlarged schematic diagram of part A.

[0021] Description of the drawings: 10. Backlight module body; 11. Lower iron frame; 12. Rubber frame; 20. Light guide plate; 30. First reflective sheet; 40. Optical film; 41. Diffusion film; 42. Upper brightening sheet; 43. Lower brightening sheet; 50. LED lamp; 60. FPC; 70. FPC thermal conductive double-sided adhesive; 80. Second reflective sheet; 90. Double-sided adhesive. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0023] A backlight module for improving LED light coupling efficiency, referring to Figure 1 , including a backlight module body 10, the backlight module body 10 includes a lower iron frame 11 and a plastic frame 12 injection-molded inside the lower iron frame 11, and the plastic frame 12 and the lower iron frame 11 cooperate with each other.

[0024] The lower iron frame 11 contains a light guide plate 20, which is arranged along the length direction of the lower iron frame 11. The light guide plate 20 is fixed between the lower iron frame 11 and the plastic frame 12 by heat-conducting double-sided adhesive. The light guide plate 20 includes a light incident surface and a light emitting surface, which are arranged opposite to each other. A first reflective sheet 30 is arranged on the light incident surface of the light guide plate 20, which is arranged along the length direction of the light guide plate 20 and is attached to one side of the light guide plate 20.

[0025] An optical film 40 is disposed on the light-emitting surface of the light guide plate 20. The optical film 40 is located on the side of the light guide plate 20 away from the first reflector 30. The optical film 40 includes a diffusion film 41 for diffusing light and an upper brightness enhancement sheet 42 and a lower brightness enhancement sheet 43 for reflection and brightness enhancement. The upper brightness enhancement sheet 42 and the lower brightness enhancement sheet 43 are attached to each other. The diffusion film 41, the lower brightness enhancement sheet 43 and the upper brightness enhancement sheet 42 are sequentially attached to the light-emitting surface of the light guide plate 20. The side of the optical film 40 away from the light guide plate 20 is adjacent to the inner side of the plastic frame 12.

[0026] The light incident surface of the light guide plate 20 is provided with an LED lamp 50 for providing light, and the LED lamp 50 is located on the inner side of the plastic frame 12. The LED lamp 50 is arranged directly opposite to the light incident surface below the light guide plate 20. An FPC 60 is arranged on one side of the LED lamp 50, and the FPC 60 is electrically connected to the LED lamp 50. The FPC 60 is located on the inner side of the lower iron frame 11, and an FPC thermal conductive double-sided adhesive 70 is arranged between the FPC 60 and the lower iron frame 11 for connection.

[0027] A second reflective sheet 80 is attached to the lower part of the plastic frame 12 relative to the position of the LED lamp 50. The second reflective sheet 80 is located in the air-avoiding area of ​​the plastic frame 12 relative to the optical film 40. The second reflective sheet 80 is attached to the side of the plastic frame 12 relative to the LED lamp 50. The second reflective sheet 80 is located between the LED lamp 50 and the light guide plate 20. The second reflective sheet 80 is directly opposite to the lower part of the light guide plate 20 and the upper part of the LED lamp 50. The second reflective sheet 80 is located on the light incident surface of the light guide plate 20. The second reflective sheet 80 and the second reflective sheet 80 are respectively located on both sides of the light guide plate 20. Most of the light emitted by the LED lamp 50 is reflected by the first reflective sheet 30 and the light guide plate 20, and the other part of the light that is not reflected is reflected by the second reflective sheet 80 on the plastic frame 12 into the light guide plate 20, and is projected into the liquid crystal display screen through the light guide plate 20.

[0028] Furthermore, the size of the second reflective sheet 80 is larger than that of the LED lamp 50 , and the second reflective sheet 80 is used to reflect the light emitted from the side of the LED lamp 50 , thereby reducing the light loss of the LED lamp 50 and increasing the amount of light passing into the light guide plate 20 , thereby increasing the brightness of the backlight module body 10 .

[0029] Furthermore, a double-sided adhesive tape 90 for bonding is disposed between the second reflective sheet 80 and the plastic frame 12 , and the second reflective sheet 80 is bonded to the plastic frame 12 by the double-sided adhesive tape 90 .

[0030] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A backlight module for improving LED light coupling efficiency, characterized in that: include: A backlight module body (10), the backlight module body (10) comprising a lower iron frame (11) and a plastic frame (12) located inside the lower iron frame (11), a light guide plate (20) being arranged inside the lower iron frame (11), a first reflective sheet (30) being arranged on one side of the light guide plate (20), an LED lamp (50) for providing light being arranged below the light guide plate (20), and a second reflective sheet (80) for reflecting light from the other side of the LED lamp (50) being arranged at a position of the plastic frame (12) relative to the LED lamp (50); The second reflective sheet (80) is attached to the plastic frame (12), the second reflective sheet (80) is arranged opposite to the lower part of the light guide plate (20) and the upper part of the LED lamp (50), and the second reflective sheet (80) and the first reflective sheet (30) are respectively located on both sides of the light guide plate (20); The size of the second reflective sheet (80) is larger than the size of the LED lamp (50); An optical film (40) is provided on the light emitting surface of the light guide plate (20); the optical film (40) is located on a side of the light guide plate (20) away from the first reflective sheet (30); the second reflective sheet (80) is located in a space-avoiding area of ​​the plastic frame (12) relative to the optical film (40); and the second reflective sheet (80) is located at the bottom of the plastic frame (12).

2. A backlight module for improving LED light coupling efficiency according to claim 1, characterized in that: The first reflective sheet (30), the LED lamp (50) and the second reflective sheet (80) are all located on the light incident surface of the light guide plate (20).

3. A backlight module for improving LED light coupling efficiency according to claim 2, characterized in that: The first reflective sheet (30) is arranged along the length direction of the light guide plate (20), and the first reflective sheet (30) is attached to one side of the light guide plate (20).

4. The backlight module for improving LED light coupling efficiency according to claim 1, characterized in that: A double-sided adhesive (90) for bonding is arranged between the second reflective sheet (80) and the adhesive frame (12).

5. The backlight module for improving LED light coupling efficiency according to claim 1, characterized in that: The optical film (40) comprises a diffusion film (41), an upper brightness enhancement sheet (42) and a lower brightness enhancement sheet (43); the diffusion film (41), the lower brightness enhancement sheet (43) and the upper brightness enhancement sheet (42) are sequentially attached to the light emitting surface of the light guide plate (20).

6. The backlight module for improving LED light coupling efficiency according to claim 1, characterized in that: An FPC (60) is provided on one side of the LED lamp (50), and the FPC (60) is electrically connected to the LED lamp (50).

7. A backlight module for improving LED light coupling efficiency according to claim 6, characterized in that: The FPC (60) is located on the inner side of the lower iron frame (11), and an FPC heat-conductive double-sided adhesive (70) for connection is provided between the FPC (60) and the lower iron frame (11).

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