PLANAR ILLUMINATION DEVICE

WIPO Patent Application WO/2013/011774

A1

An objective of the present invention is to provide a planar illumination device which is large, has a thin shape, is flexible, and with which it is possible to emit light with high light usage efficiency and low brightness unevenness, as well as to prevent buckling of a diffusion sheet and obtain a luminosity distribution which is either uniform or convex. This planar illumination device comprises two or more layers with different particle concentrations which a light-guiding plate overlaps in a direction which is perpendicular to a light emission plane. In the direction which is perpendicular to a light entrance plane, the thicknesses of the two or more layers respectively change, the composite particle concentrations change, the light-guiding plate, a light source unit, the diffusion sheet, and a casing fit together on the light source unit side, and with the radius of curvature when the planar illumination device overall is curved designated R, then the bending stress P satisfies the formulae P > μ0/tan(a/R), and P ≤ Pmax.

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JP2019109999	PLANAR LIGHT UNIT
JP2006120590	LIGHT-EMITTING DEVICE, METHOD FOR FORMING LIGHT EMITTER, BACKLIGHT ASSEMBLY HAVING LIGHT-EMITTING DEVICE, AND DISPLAY DEVICE HAVING THE BACKLIGHT ASSEMBLY

OKUMURA TAKAMITSU (JP)
IWASAKI OSAMU (JP)

PCT/JP2012/065018

January 24, 2013

June 12, 2012

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FUJIFILM CORP (JP)
OKUMURA TAKAMITSU (JP)
IWASAKI OSAMU (JP)

F21S2/00; F21Y101/02

WO2005083474A1

2005-09-09

JP2011039189A	2011-02-24
JP2009117357A	2009-05-28

WATANABE Mochitoshi et al. (JP)
Mochitoshi Watanabe (JP)

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