CN1321345C - Edge-lit backlight module - Google Patents

Abstract

A side-light type backlight module comprises a light guide plate, at least one light source generator arranged at the side of the light guide plate for providing a light source and emitting into the light guide plate, at least one reflector surrounding the light source generator outside the light guide plate for reflecting the light generated by the light source generator to the light guide plate, a frame arranged below the light guide plate and the reflector and covering the outside of the reflector, and a heat-dissipating pad arranged between the reflector and the frame.

Description

Edge-lit backlight module

technical field

The invention relates to an edge light backlight module, in particular to an edge light backlight module with a high heat dissipation effect.

Background technique

The backlight module is one of the key components of the liquid crystal display, and has been widely used in digital cameras, digital personal assistants (PDAs), computer monitors and flat-screen TVs. Generally speaking, the backlight module is arranged under a display panel, and has a light source and a light guide plate, which are used to provide a uniformly dispersed light to the display panel, and then control the pixel electrodes on the display panel to form appropriate of the image. Wherein, the backlight module can be divided into direct type backlight module whose light source is directly below the display panel or edge light type backlight module whose light source is near the side of the display panel according to the location of the light source. In addition, since the edge-lit backlight module arranges the light source generator on the side of the display panel, the volume and manufacturing cost of the liquid crystal display can be reduced, and it can be applied to small electrical products.

Please refer to FIG. 1 , which is a schematic cross-sectional view of a conventional edge-lit backlight module 10 . As shown in FIG. 1 , the existing edge-lit backlight module 10 is arranged under a display panel 12, and mainly includes a light guide plate (light guide plate, LGP) 14 arranged under the display panel 12, and a light source generator (light source generator). ) 16 is arranged on one side of the light guide plate 14, a reflector 18 is arranged on the outside of the light source generator 16, a reflective sheet (reflecting sheet) 20 is arranged under the light guide plate 14 and is fixed on a frame 22, and a diffuser plate The (diffusing plate) 24 is disposed between the light guide plate 14 and the display panel 12 . Wherein, the light source generator 16 is used to provide a light source to the display panel 12, and the reflector 18 and the reflector plate 20 are used to reflect the light generated by the light source generator 16 into the light guide plate 14 to increase the utilization rate of light, so as to provide A better light output. The light guide plate 14 is used to scatter the light source generated by the light source generator 16 to the diffuser plate 24, and the diffuser plate 24 can further scatter the light reflected by the light guide plate 14 to provide the display panel 12 with more evenly dispersed light. The frame 22 is used to fix the light guide plate 14 , the light source generator 16 , the reflection cover 18 , the reflection plate 20 and the diffusion plate 24 . In addition, generally at least one prism sheet (prism sheet) 26 is generally provided above the diffuser plate 24 to further correct the difference in illumination intensity, so that the light received by the display panel 12 can have a higher luminance, and the prism sheet 26 The number and order of setting can be changed according to requirements.

Generally speaking, the light source generator 16 is mostly composed of a cold cathode fluorescent lamp (CCFL), so heat energy will be generated during operation. And in order to meet the lightweight requirements of future products such as thinner thickness and smaller volume, the light source generator 16 in the backlight module 10 is often installed in a narrow and small airtight space, so the heat energy generated during operation is often unable to It is released smoothly and accumulates continuously. Once the operation time is a little longer, it will easily cause the temperature near the lamp tube to be too high. However, since the cold cathode fluorescent lamps have the best luminance when the ambient temperature is 30 to 40° C., the high temperature will reduce the luminance of the backlight module and affect the luminance performance of the liquid crystal display. In addition, an excessively high temperature will affect the normal operation of the display panel 12 and result in a decrease in display quality, and may even greatly reduce the service life of surrounding components.

Contents of the invention

Therefore, the object of the present invention is to provide a side-lit backlight module with a high heat dissipation effect, which uses a heat dissipation pad to quickly conduct the heat energy generated by the backlight module to effectively reduce the temperature of the liquid crystal display, and then maintain the best display of the liquid crystal display Effect.

In order to achieve the above purpose, the present invention discloses a side-lit backlight module with a high heat dissipation effect, which includes a light guide plate, and at least one light source generator is arranged on the side of the light guide plate to provide a light source and inject it into the light guide plate. A light plate, at least one reflector (reflector) surrounds the outside of the light source generator relative to the light guide plate, and is used to reflect the light generated by the light source generator to the light guide plate, and a frame with a high heat transfer coefficient is provided. A heat-dissipative pad with high heat transfer coefficient is disposed between the reflector and the frame under the light guide plate and the reflector and covers the outside of the reflector. The heat dissipation pad is made of elastic material, so it can be in close contact with the reflector and the frame. At the same time, the heat dissipation pad has a high heat transfer coefficient, so it can quickly transfer the heat energy accumulated inside the backlight module to achieve the function of heat dissipation.

Description of drawings

FIG. 1 is a schematic cross-sectional view of an existing edge-lit backlight module;

2 is a schematic cross-sectional view of an edge-lit backlight module according to a first embodiment of the present invention;

3 is a schematic cross-sectional view of an edge-lit backlight module according to a second embodiment of the present invention.

Detailed ways

Please refer to FIG. 2 , which is a schematic cross-sectional view of a first embodiment of an edge-lit backlight module 50 of the present invention. As shown in FIG. 2 , the edge-lit backlight module 50 of the present invention is disposed under a display panel 52, and includes a light guide plate (light guide plate, LGP) 54 disposed under the display panel 52, at least one light source generator ( light source generator) 56 is located on one side of the light guide plate 54, a reflector 58 is located on the other outside of the light source generator 56 relative to the light guide plate 54 and covers the outside of the light source generator 56, a reflective sheet (reflecting sheet ) 60 is arranged below the light guide plate 54 and fixed on a frame 62, a diffusing sheet 64 is arranged between the light guide plate 54 and the display panel 52, and a heat dissipation pad 66 is arranged on the light guide cover 58 and the frame 62 Between them, they are used to transmit the heat energy generated by the light source generator 56 .

Wherein, the light source generator 56 is for example: cold cathode fluorescent lamp (cold cathode fluorescent lamp, CCFL), hot cathode fluorescent lamp (hot cathode fluorescent lamp, HCFL), external electrode fluorescent lamp (external electrode fluorescent lamp, EEFL) or other suitable for side The light source generator of the optical backlight module is used to provide a light source to the display panel 52 . The reflector 58 is a rectangular structure covering the light source generator 56, and is used to reflect the light generated by the light source generator 56 into the light guide plate 54 to increase the utilization rate of light, thereby providing a better brightness output . The light guide plate 54 is used to scatter the light generated by the light source generator 56 to the diffuser plate 64 . The diffuser plate 64 can further diffuse the light reflected from the light guide plate 54 to provide the display panel 52 with more evenly dispersed light. The frame 62 is used to fix the light guide plate 54 , the light source generator 56 , the reflection cover 58 , the reflection plate 60 and the diffusion plate 64 . In addition, generally at least one prism sheet (prism sheet) 68 is generally provided above the diffuser plate 64 to further improve the brightness of the module.

It is worth noting that the cooling pad 66 of the present invention is made of an elastic material with a high heat transfer coefficient, so it can be closely attached to the contacting reflector 52 and the frame 62, and then utilize the material with a high heat transfer coefficient itself. The heat energy accumulated inside the edge-lit backlight module 50 is transferred to the outside through the frame 62 to effectively reduce the temperature of the edge-type backlight module 50 to achieve rapid heat dissipation, thereby avoiding various problems caused by the overheating of the backlight module.

Please refer to FIG. 3 . FIG. 3 is a schematic cross-sectional view of a second embodiment of an edge-lit backlight module 50 of the present invention. For convenience of description, FIG. 3 uses the same reference numerals as in FIG. 2 . As shown in FIG. 3 , the edge-lit backlight module 50 of the present invention is arranged under a display panel 52, which includes a light guide plate (lightguide plate, LGP) 54, arranged under the display panel 52, and at least one light source generator. (light source generator) 56 is arranged on one side of light guide plate 54, and a reflector 58 is arranged on the outside of light source generator 56, and covers the outside of light source generator 56, and a reflecting plate (reflecting sheet) 60 is arranged on light guide plate 54 Below and fixed on a frame 62, a diffusing plate (diffusing plate) 64 is arranged between the light guide plate 54 and the display panel 52, and a heat dissipation pad 66 is arranged between the reflector 58 and the frame 62, in order to conduct the light source to generate The thermal energy generated by device 56. In the embodiment shown in FIG. 3 , the components of the edge-lit backlight module 50 of the present invention are substantially the same as those of the first embodiment, the main difference being that the reflector 58 of the second embodiment is an arc-shaped structure Or a reflector with a non-square structure, so that the light generated by the light source generator 56 can be more effectively concentrated and reflected into the light guide plate 54. As mentioned above, since the heat dissipation pad 66 of the present invention is an elastic material, it still It can be effectively in close contact with the reflector 58 and the frame 62 , and through its own high heat transfer coefficient, it can quickly transmit the heat energy accumulated inside the edge-lit backlight module.

Compared with the prior art, the edge-lit backlight module of the present invention is provided with a heat dissipation pad between the reflector and the frame, and then utilizes the elasticity and high heat transfer coefficient of the heat dissipation pad to effectively dissipate the heat generated by the light source generator. The generated heat energy is transmitted out of the backlight module to achieve rapid heat dissipation, so it can fully improve the shortcomings of the existing edge-lit backlight module, such as reduced brightness, shortened component life, and seriously affected display quality due to the small space and inability to effectively dissipate heat.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the patent of the present invention.

Claims (11)

1. An edge-lit backlight module, which comprises: a light guide plate; At least one light source generator is arranged on the side of the light guide plate, and is used to provide a light source and inject it into the light guide plate; at least one reflector, surrounding the light source generator relative to the light guide plate, for reflecting the light generated by the light source generator to the light guide plate; A frame with a high heat transfer coefficient is arranged under the light guide plate and the reflection cover, and covers the outside of the reflection cover; and A heat dissipation pad with high heat transfer coefficient is arranged between the reflection cover and the frame, and is in close contact with the reflection cover and the frame. 2. The edge-lit backlight module as claimed in claim 1, wherein the cooling pad is elastic. 3. The edge-lit backlight module as claimed in claim 1, wherein the light source generator is a CCFL. 4. The edge-lit backlight module as claimed in claim 1, wherein the light source generator is a hot cathode fluorescent lamp. 5. The edge-lit backlight module as claimed in claim 1, wherein the light source generator is an external electrode fluorescent tube. 6. The edge-lit backlight module as claimed in claim 1, wherein the frame is a metal frame. 7. The edge-lit backlight module as claimed in claim 1, wherein the reflector includes at least two structural sides forming a right angle, and at least one of the structural sides is in contact with the heat dissipation pad. 8. The edge-lit backlight module as claimed in claim 1, wherein the reflector is an arc-shaped structure. 9. The edge-lit backlight module as claimed in claim 1, wherein the heat dissipation pad is used to transmit heat generated by the light source generator to the frame through the reflector, so as to increase the heat dissipation efficiency of the edge-lit backlight module . 10. The edge-lit backlight module as claimed in claim 1, further comprising a diffusion plate disposed above the light guide plate for diffusing light reflected by the light guide plate. 11. The edge-lit backlight module as claimed in claim 1, further comprising at least one prism sheet disposed above the diffusion plate.

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