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Title:
LIGHTING DEVICE, VIDEO DISPLAY DEVICE, AND VIDEO SIGNAL CONTROL METHOD
Document Type and Number:
Japanese Patent JP2007240858
Kind Code:
A
Abstract:

To provide a lighting device, a video display device, and a video signal control method that can provide an image having a high contrast ratio while suppressing deterioration in an image like a level difference in luminance and variance in light emission efficiency of a light source small.

The lighting device 100 is constituted by arraying at least one or more lighting means 30 each having a short-wavelength light source 40 emitting short-wavelength light and a wavelength converting means 50 of emitting visible light in response to the short-wavelength light as exciting light corresponding to a plurality of lighting regions. Then the lighting device 100 irradiates an optical modulating element adjusting the quantity of light according to a video signal with the visible light as illumination light. Further, the lighting device 100 includes a frequency distribution calculating means 10 of calculating frequency distributions of luminance of the video signal by the plurality of lighting regions based upon luminance information of the video signal and a lighting modulating means 20 of modulating the quantity of the short-wavelength light emitted by the short-wavelength light sources of the one or more lighting means 30 according to the calculated frequency distributions.

COPYRIGHT: (C)2007,JPO&INPIT


Inventors:
ENDO TAKAO
MURAI TAKUO
FUKUDA HIDEKI
KOJIMA KUNIKO
NIIKURA EIJI
Application Number:
JP2006062878A
Publication Date:
September 20, 2007
Filing Date:
March 08, 2006
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G02F1/133; F21S2/00; F21V7/00; F21V8/00; F21V29/00; F21V29/02; G02F1/13357; G09G3/20; G09G3/34; G09G3/36; H01L33/50; H01L33/54; H01L33/56; H01L33/60; F21Y101/02
Domestic Patent References:
JP2005258403A2005-09-22
JP2003331604A2003-11-21
Foreign References:
WO2005055328A12005-06-16
Attorney, Agent or Firm:
Michiteru Soga
Michiharu Soga
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order