Side-in and directly-down back light module unit

A backlight module, direct type technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as the inability to obtain the effect of direct type backlight modules, the inability to use the optimized model of the light guide plate, and the numerous microstructures of the light guide plate. Achieve the effect of improving light utilization, reducing design difficulty and high light efficiency

Inactive Publication Date: 2008-01-23
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] 1. The utilization rate of the light source is low, and the thinner it is to make, the lower the utilization rate will be
Obviously, the lack of light efficiency directly restricts the development space of this technology for larger display screens
[0016] 2. The light guide plate has many microstructures and is complicated to manufacture
This not only affects the utilization rate of the light source, but also has the problem that the optimization model of the light guide plate cannot be used in different sizes. If the size changes slightly, the microstructural parameters of the light guide plate model must be changed accordingly to achieve similar optimization. Effect, that is, every time a new size light guide plate is produced, a new model and a new manufacturing mold are required
This is not conducive to industrialized module production
[0017] 3. The uniformity is not good. Although the model of the light guide plate is getting more and more optimized, the surface light source of the side-type backlight is becoming more and more uniform, but due to the limitation of the optical path, it is still impossible to obtain a backlight module close to the direct-type backlight Effect

Method used

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  • Side-in and directly-down back light module unit
  • Side-in and directly-down back light module unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] As shown in Figure 1, a side-entry direct-lit backlight module includes a side-emitting optical fiber 32, a diffuser plate 4, a side-entry light source 1 and its optical coupler 2, and the side-entry light source 1 and its optical coupler 2 are located at the side-entry Directly down to the side end of the conversion structure 3 , the diffusion plate 4 is located at the upper end of the side light-emitting optical fiber 32 .

[0035] The side-incoming light source 1 is incident from the side, and the optical coupler 2 is used to couple the light into the side-emitting optical fiber 32 to the maximum extent, and the side-emitting optical fiber 32 is used to convert the light source into a direct line light source, which is diffused into a surface light source through the diffusion plate 4 . Control the light output rate from the side of the side-emitting optical fiber 32 to ensure the uniformity of the light output from the side.

Embodiment 2

[0037] As shown in FIG. 2 , the side-emitting optical fiber 32 is replaced with a light-guiding fiber 33 , and a lens 5 is arranged between the light-guiding fiber 33 and the diffusion plate 4 . Others are the same as in Example 1.

[0038] The side input light source 1 is incident from the side, and the optical coupler 2 is used to couple the light into the light guide fiber 33 to the maximum extent, and the light guide fiber 33 is used to convert the light source into a direct line light source, diffused by the lens 5, and then passed through the diffusion plate 4 is further diffused into a surface light source. The light output rate of each light guiding optical fiber 32 is controlled to ensure the uniformity of light output.

Embodiment 3

[0040] As shown in Figure 3, a side-in direct backlight module includes a mirror 31, a diffusion plate 4, a laser light source 1 and its light mixer 6, and the laser light source 1 and its light mixer 6 are located on the mirror 31. The diffuser plate 4 is located at the upper end of the mirror 31, and a diffuser mirror surface 5 is provided between the diffuser plate 4 and the mirror 31.

[0041] The laser light source 1 is incident from the side, and the laser light source is synthesized into a white beam by the light mixer 6, and the side is incident into the transflector 31, a part of the light is reflected, and the rest passes through the transflector 31 and shoots to the next transflector 31 for control. The reflectivity and transmittance of the reflective mirror 31 are optimized to ensure the uniformity of the reflected light. The reflected light is diffused by the scattering mirror 5 and further diffused by the diffusion plate 4 to become a uniform surface light source....

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Abstract

The invention relates to the technical field of backlight module, and discloses a side-in direct downward backlight module, which comprises a side-in light source, a side-in direct downward converter and a spreading board. The side-in light source is located at side end of the side-in direct downward converter, and the spreading board is located on the upper end of the side-in direct downward converter. As the light source is arranged at side, the module can be thinner; but after conversion, the light source is equal to a direct downward light source, which remains the advantages of the direct downward light source such as high brightness and evenness; the light utilization as a whole can be improved better without using any light-guiding board. In addition, the light source can be a semi-conductor laser, which is of high light efficiency and low heating, and can indirectly reduce the temperature rising. Additionally, a laser light source can be used, which has such advantages as the high light efficiency, the low energy consumption, the wide color domain and the polarization, etc.

Description

technical field [0001] The invention relates to a backlight module, in particular to a backlight module of a liquid crystal display device. Background technique [0002] Liquid crystal display devices have the advantages of thinness, low power consumption, and low radiation, and are widely used in electronic display devices such as notebook computers, mobile phones, electronic dictionaries, LCD TVs, and PDAs. Since the liquid crystal itself does not have light-emitting properties, a backlight module is required to realize the display function. [0003] The so-called backlight generally refers to the light source on which the display screen depends. Light sources commonly used in backlighting include EL, CCFL, LED, laser and LIFI. [0004] EL backlight, that is, electroluminescence, is a cold light source that emits light by the intrinsic luminescence of phosphor powder excited by an alternating electric field. It has the advantages of ultra-thin, low energy consumption, s...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G02F1/13357G02F1/1335
Inventor王钢罗睿宏
OwnerSUN YAT SEN UNIV