Title:
PLANAR LIGHTING DEVICE, IMAGE DISPLAY DEVICE, AND OPTICAL FILM
Document Type and Number:
WIPO Patent Application WO/2022/230657
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a planar lighting device that has excellent frontal brightness and parallel light source characteristics, an image display device that uses the planar lighting device, and an optical film for use in the planar lighting device. The present invention has, in order, a light-absorbing anisotropic layer for which a transmittance center axis is orthogonal to the surface of the layer, a light-transmitting anisotropic layer, a light-diffusing layer, a light source, and a reflection layer. When T0 is the transmittance and A0 is the absorbance when light of a wavelength of 550 nm is incident from the normal line direction to the light-transmitting anisotropic layer and T50 is the transmittance and A50 is the absorbance when light of a wavelength of 550 nm is incident from the direction at a polar angle of 50° to a normal line to the light-transmitting anisotropic layer, T0>T50, T50<70%, A0<0.05, and A50<0.05.
Inventors:
MITOBE FUMITAKE (JP)
WATANABE SHINYA (JP)
NISHIMURA NAOYA (JP)
WATANABE SHINYA (JP)
NISHIMURA NAOYA (JP)
Application Number:
PCT/JP2022/017575
Publication Date:
November 03, 2022
Filing Date:
April 12, 2022
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
F21S2/00; F21V9/08; F21V9/40; G02B5/30; F21Y103/00; F21Y115/10; F21Y115/15
Foreign References:
| JP2010062112A | 2010-03-18 |
Attorney, Agent or Firm:
ITOH Hideaki et al. (JP)
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