Title:
BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/212266
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a direct-type backlight unit, the emission spectrum thereof having been made a narrow band, and a liquid crystal display device that uses this backlight unit and has high color purity. This problem is solved with a backlight unit having: a reflection element; a wavelength-selective reflection sheet with wavelength selectivity; a plurality of light sources; and an absorption element that is positioned between the wavelength-selective reflection sheet and the reflection element, wherein the absorption element has a maximum light absorption in the wavelength range 460-520nm and/or 540-620nm, a cholesteric liquid crystal layer selectively reflects light that the absorption element absorbs, the wavelength-selective reflection sheet has a reflectance distribution within a surface, and the reflectance is in accordance with the positions of the light sources.
Inventors:
YONEMOTO TAKASHI (JP)
ICHIHARA NOBUHIKO (JP)
TOYAMA HIROFUMI (JP)
ICHIHARA NOBUHIKO (JP)
TOYAMA HIROFUMI (JP)
Application Number:
PCT/JP2018/019052
Publication Date:
November 22, 2018
Filing Date:
May 17, 2018
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
F21S2/00; F21V7/22; F21V7/24; F21V7/28; G02B5/22; G02B5/30; G02F1/13357; F21Y105/16; F21Y115/10
Foreign References:
| JP2017054051A | 2017-03-16 | |||
| JP2017084761A | 2017-05-18 | |||
| JP2006309980A | 2006-11-09 |
Attorney, Agent or Firm:
WATANABE Mochitoshi et al. (JP)
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