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Back light module

A backlight module and optical axis technology, which is applied in optics, light guides, optical components, etc., can solve the problems of high production cost of backlight modules, inability to fully popularize the utilization rate of liquid crystal displays, and inability to increase profits of manufacturers, etc. To achieve the effect of improving the utilization rate

Inactive Publication Date: 2011-03-30
华映视讯(吴江)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Due to the above reasons, the overall production cost of the backlight module is too high, which not only causes the price of the product to remain high, but also prevents the profit of the manufacturer from increasing. The impact is that the utilization rate of the LCD cannot be fully popularized.

Method used

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Embodiment Construction

[0038] see figure 2 As shown, it is a schematic diagram of the backlight module of the first embodiment of the present invention, in which the backlight module 20 includes an anisotropic light guide plate 21, a polarizer 22, an isotropic pattern 23, a light source 24 and a reflector slice 25.

[0039] The anisotropic light guide plate 21 has a light incident surface 211, a light exit surface 212 connected to the light incident surface 211, and a bottom surface 213 opposite to the light exit surface 212, and the direction perpendicular to the light incident surface 211 is the optical axis direction , wherein the anisotropic light guide plate 21 has a first refractive index (n e ), with a second refractive index (n 0 ). In a preferred embodiment, the material of the anisotropic light guide plate 21 can be a light-transmitting polymer material, such as polymethyl methacrylate (PMMA) or polyacetyl terephthalate (PET ). In addition, other materials with natural optical anisot...

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Abstract

The invention relates to a back light module which comprises an anisotropic light guide plate, a polarizer and an isotropic pattern, wherein the anisotropic light guide plate is provided with a light inlet surface, a light outlet surface and a bottom surface, the anisotropic light guide plate takes the direction perpendicular to the light inlet surface as the direction of an optical axis, the anisotropic light guide plate has a first refractive index (ne) in the direction of the optical axis and has a second refractive index (n0) in the direction perpendicular to the direction of the optical axis, the polarizer is arranged above the light outlet surface of the anisotropic light guide plate, an included angle between the penetrating axis of the polarizer and the optical axis of the anisotropic light guide plate is angle theta, the isotropic pattern is arranged on the bottom surface of the anisotropic light guide plate, and the refractive index of the isotropic pattern is np and conforms to the limitation of (1 / np)=(costheta / ne)+(sintheta / n0).

Description

technical field [0001] The invention relates to a backlight module, in particular to a backlight module using an anisotropic light guide plate to improve light utilization. Background technique [0002] With the rapid advancement of thin-film transistor manufacturing technology, and its advantages of thinness, power saving, and radiation-free, LCD panels are widely used in personal digital assistants, notebook computers, digital cameras, televisions, and mobile phones. various electronic products. [0003] However, since the liquid crystal panel is a non-self-luminous display device, it must be assisted by the backlight provided by the backlight module to display the picture information of the liquid crystal panel. In order to improve the utilization rate of the light source and improve the uniformity of the backlight The backlight module must be combined with various optical films with different functions. The common optical films include BEFIII light enhancement film and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357F21V8/00F21V9/14F21V5/00
Inventor 张家骏王耀东
Owner 华映视讯(吴江)有限公司