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Optical coupling module of lateral-entry type light guide plate and backlight module applying optical coupling module

A light guide plate and side-entry technology, which is applied in the field of optical coupling modules, can solve the problems of low light energy utilization rate and restricted thickness of side-entry light guide plate, so as to reduce light collection efficiency, improve light energy utilization rate, and realize thinness effect

Active Publication Date: 2015-07-22
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide an optical coupling module of a side-entry light guide plate and a backlight module using the module, so as to solve the problem that the thickness of the side-entry light guide plate is limited by the cross-sectional width of the light source, and the resulting light source The problem of low utilization rate of light energy when the cross-sectional width is larger than the incident end face of the side-entry light guide plate

Method used

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  • Optical coupling module of lateral-entry type light guide plate and backlight module applying optical coupling module
  • Optical coupling module of lateral-entry type light guide plate and backlight module applying optical coupling module
  • Optical coupling module of lateral-entry type light guide plate and backlight module applying optical coupling module

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Embodiment 1

[0032] Example 1: Such as figure 2 Shown is a schematic diagram of Example 1 of the present invention. The light coupling module 51 of the side-type light guide plate includes a light-emitting source 11, a light collector 21, and a scattering cover 32. The side-type light guide plate 13 is a wedge-shaped plate or a flat plate structure that can transmit light. Mainly acrylic, the side surface of the side entry light guide plate 13 is the side entry light guide plate light entry end surface 131, the upper surface is the side entry light guide plate light exit end surface 132, the side entry light guide plate light exit end surface 132 and the liquid crystal panel 18 Corresponding.

[0033] The light-emitting source 11 is located under the light collector 21 and is indirectly coupled with the incident end surface 131 of the side-type light guide plate. It is the lighting source of the entire backlight module. The light-emitting source 11 is a linear light source or a linear light ...

Embodiment 2

[0036] Example 2: Such as image 3 Shown is a schematic diagram of Example 2 of the present invention. Compared with the first embodiment of the present invention, the difference is that the concentrator 21 has three surfaces that play an optical function in the optical path, namely the concentrator incident plane 212, the concentrator reflection free-form surface 211 and the concentrator exit plane 213. . The light collector incident plane 212 and the light collector exit plane 213 change the direction of light propagation, but do not contribute to the optical power, which is essentially equivalent to only the light collector reflecting free-form surface 211 has an effect on the optical power Therefore, when designing, first calculate the equivalent positions of the luminous source 11 and the exit port 321 of the diffuser cover (as the convergence point) relative to the incident plane 212 of the collector and the exit plane 213 of the collector, and then calculate the free-for...

Embodiment 3

[0037] Example 3: Such as Figure 4 Shown is a schematic diagram of Example 3 of the present invention. Compared with the first embodiment of the present invention, the difference is that the light collector 21 has three surfaces that play an optical function in the optical path, namely the light collector incident plane 212, the light collector reflection freeform surface 211 and the light collector exit freeform surface. 214. The light collector 21 in the optical coupling module shown includes two free-form surfaces. The light-collector reflects the free-form surface 211 to collect and shrink the light beam, and the light-collector emits the free-form surface 214 to further shrink the light beam and produce convergent The light spot is at the exit port 321 of the diffuser. This embodiment can still maintain the high light energy utilization rate of the system, and at the same time fundamentally realize the thinning of the backlight module.

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Abstract

The invention relates to an optical coupling module of a lateral-entry type light guide plate. The optical coupling module comprises a light source, an optical collector and a scattering cover; the light source is located on one side of the lateral-entry type light guide plate and is indirectly coupled with an incident end face of the lateral-entry type light guide plate; the optical collector is located between the light source and the lateral-entry type light guide plate along the light scattering direction to have light beams emitted from the light source collected, shrunk and converged; the scattering cover covers the light source and the optical collector from outer side to have the same limited, the inner surface of the scattering cover is coated with an optical scattering layer used for secondarily collecting optical energy lost during optical coupling, and an emitting port of the scattering cover is docked with the incident end face of the lateral-entry type light guide plate. The invention further relates to a backlight module applying the optical coupling module. The problem that the thickness of the light guide plate is limited by the width of the cross section of the light source is solved, utilization rate of the optical energy can be increased, system power consumption is lowered, thinning tendency of the backlight module is realized, the optical coupling module can be separately assembled and disassembled independently of the backlight module, convenience in maintenance is achieved, and cost is saved.

Description

Technical field [0001] The invention relates to a light coupling module of an edge-type light guide plate and a backlight module using the module. Background technique [0002] In recent years, the liquid crystal display technology has gradually replaced the traditional cathode ray tube display technology and occupied the mainstream of flat-panel display products due to the advantages of light and thin products, small footprint, and small radiation. The liquid crystal display is not an active light-emitting display device, and it needs a backlight module to provide illumination for the image to be displayed. The function of the backlight module is to pass the light emitted by the point light source or the line light source through the light guide plate to form the surface light source required for the liquid crystal display. It not only determines the light efficiency, uniformity and color characteristics of the liquid crystal display, but also makes the backlight module thinner....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/00G02F1/13357
CPCG02B6/0023G02B6/0025G02F1/133606G02F1/133615G02F1/133607
Inventor 陈恩果郭太良林志贤叶芸林金堂徐胜郭明勇
Owner FUZHOU UNIV
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