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Liquid crystal display apparatus and backlight unit used in liquid crystal display apparatus

A liquid crystal display device, backlight unit technology, applied in the direction of optics, nonlinear optics, static indicators, etc., can solve the problem that the value is different from the correct value, so as to reduce the noise level, reduce the detection deviation, and reduce the change of the detection level Effect

Active Publication Date: 2007-09-26
NEC LCD TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, a difference is generated between the output information of the optical sensor 406 and the information stored in the arithmetic section 408, so that the value controlled by the backlight controller 409 is different from the correct value.

Method used

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  • Liquid crystal display apparatus and backlight unit used in liquid crystal display apparatus
  • Liquid crystal display apparatus and backlight unit used in liquid crystal display apparatus
  • Liquid crystal display apparatus and backlight unit used in liquid crystal display apparatus

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Embodiment Construction

[0026] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 2 to 4 .

[0027] FIG. 2 is an exploded perspective view schematically showing a liquid crystal display device according to a first embodiment of the present invention.

[0028] As shown in FIG. 2 , the liquid crystal display device includes a liquid crystal panel 102 , an LED light source 101 , an optical sheet 105 , a light guide plate 103 and a reflection plate 104 . The liquid crystal display device also includes an inner case 115 serving as a case for the backlight unit. The liquid crystal display device includes a case 116 serving as a monitor frame that accommodates the backlight unit and the liquid crystal panel 102 . The light guide plate 103 is made of a transparent material such as acrylic resin having a substantially rectangular parallelepiped shape. The LED light source 101 is provided on the lower surface of the light guide plate 103 . Light emitted from the LE...

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PUM

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Abstract

A display apparatus provides an improved control accuracy of the brightness and the chromaticity. The liquid crystal display apparatus has a liquid crystal panel and a backlight unit for applying diffused light to the liquid crystal panel in a form of a sheet. The backlight unit has a light source, a light guide plate for converting light emitted from the light source into a sheetlike beam of light, an optical sheet for converting light emitted from the light guide plate into condensed light or diffused light, and an optical sensor unit for detecting a portion of light from the light guide plate and converting the detected light into an electric signal. The backlight unit also has a case housing the light source, the light guide plate, the optical sheet, and the optical sensor unit. The optical sensor unit is fixed to an area that is inside of the light guide plate and exerts no influence on display.

Description

[0001] This application claims priority from prior Japanese Patent Application JP2006-078018, the disclosure of which is hereby incorporated by reference. technical field [0002] The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having a function of controlling brightness or chromaticity with an optical sensor, and a backlight unit used in such a liquid crystal display device. Background technique [0003] A liquid crystal display device employs a technology of controlling a light source to adjust the brightness and chromaticity of light applied to a liquid crystal panel to desired levels. For example, Japanese Laid-Open Patent Application No. 2004-199968 (Patent Document 1) discloses such a liquid crystal display device. [0004] According to Patent Document 1, light is applied to the entire surface of a liquid crystal panel from a planar light source device. The planar light source device includes a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357G02F1/1333G02F1/133G02F1/1335
CPCG09G2360/145G09G2320/0626G09G2320/0666G09G3/3406
Inventor 板谷秀树
Owner NEC LCD TECH CORP
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