Backlight module and display device

A technology of backlight module and linearly polarized light, which is applied in optics, nonlinear optics, instruments, etc., to achieve the effect of enhancing brightness and improving utilization rate

Active Publication Date: 2016-11-09
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It can be seen from the above principle that the brightness enhancement film added in the backlight module can double the effective amount of backlight emitted by the backlight module to the lower polarizer of the liquid crystal panel. In fact, the effective amount of backlight emitted by the backlight module to the lower polarizer of the LCD panel can only be increased by about 40%.

Method used

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  • Backlight module and display device
  • Backlight module and display device

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Embodiment Construction

[0024] The specific implementation manners of the backlight module and the display device provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Based on the existing backlight module structure, the transmittance of the brightness enhancement film is 85%, the reflectivity of the brightness enhancement film is 95%, and the recycling rate of reflected light in the backlight module is 80%. The formula for calculating the light transmittance P of the group is as follows:

[0026] P=(0.5*Transmittance of Brightness Enhancement Film)X+(0.5*Reflectivity of Brightness Enhancement Film*Recycling of Reflected Light)*(0.5*Transmittance of Brightness Enhancement Film)*X+……

[0027] =0.5*0.85X+0.5 2 *0.95*0.8*0.85X+…+0.5 n *(0.95*0.8) n-1 *0.85X

[0028] =[0.5+0.5 2 *0.95*0.8+…+0.5 n *(0.95*0.8) n-1 ]0.85X

[0029] ≈0.70X

[0030] Among them, X is the light intensity of the backlight. It can be ...

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Abstract

The invention discloses a backlight module and a display device. The backlight module comprises a brightening film, a diffusion plate and a magnetic reflective sheet, wherein the brightening film is used for allowing linearly polarized light in the first direction to penetrate through and reflecting linearly polarized light in the second direction perpendicular to the first direction; the magnetic reflective sheet is used for transforming the linearly polarized light reflected by the brightening film into elliptically polarized light by the magneto-optical Kerr effect; linearly polarized light component in the first direction in the elliptically polarized light reflected by the magnetic reflective sheet can penetrate through the brightening film, linearly polarized light component in the second direction is reflected again to the magnetic reflective sheet and is transformed into the elliptically polarized light, the operation cycles continuously, the ratio of the linearly polarized light in the direction of the brightening film is increased, utilization rate of backlight is increased, and brightness of a liquid crystal display is improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a backlight module and a display device. Background technique [0002] Since the liquid crystal panel is not a self-luminous element, the liquid crystal display must use a backlight module to provide a backlight source for the liquid crystal panel to produce a display effect. Therefore, the existing liquid crystal display generally includes a liquid crystal panel and a backlight module. It consists of an upper polarizer, an opposite substrate, a liquid crystal layer, an array substrate and a lower polarizer arranged in sequence from top to bottom. [0003] In order to enhance the brightness of the image displayed on the liquid crystal display, it is necessary to increase the utilization rate of the backlight. At present, the commonly used method is to add a reflective polarizer, that is, a brightness enhancement film, between the backlight module and the lower polarizer of the l...

Claims

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Application Information

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IPC IPC(8): G02F1/13357G02F1/1335
CPCG02F1/133528G02F1/133605G02F1/133606G02F1/133615G02F1/133507
Inventor 任锦宇程翔宇徐长健王丹马国靖
Owner BOE TECH GRP CO LTD
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