EDGE LIGHT-TYPE BACKLIGHT DEVICE AND LIGHT DIFFUSION MEMBER

WIPO Patent Application WO/2013/146823

A1

Provided is an edge light-type backlight device in which a light diffusion sheet is employed whereby high frontal brightness and diffusion are effected by application to the characteristics of a prism sheet with a high index of refraction. This edge light-type backlight device comprises, in order, a light guide plate, a light source which is positioned at one end part of the light guide plate, and a light diffusion sheet and a prism sheet upon a light emission face of the light guide plate. The index of refraction of the prism sheet exceeds 1.60, a peak of emitted light distribution of a light emission face of the light diffusion sheet in a plane which is parallel to one end part of the light guide plate and orthogonal to the light emission face is within angle ranges of 30-45° and -30--45° to a normal direction of the light emission face, and the emitted light of the light emission face of the light diffusion sheet diminishes toward an emission angle -90° or 90° with respect to the normal line from the angle ranges of the peak of the emitted light distribution.

YOKOTA HIROSHI (JP)
TAKAI MASASHI (JP)

PCT/JP2013/058871

October 03, 2013

March 26, 2013

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KIMOTO KK (JP)

G02B5/02; F21S2/00; G02B5/04; G02F1/13357; F21Y101/02; F21Y103/00

JP2007066880A	2007-03-15
JP2004163945A	2004-06-10
JP2010231896A	2010-10-14
JP2008091287A	2008-04-17

Sannozaka Patent Law Firm (JP)
Patent business corporation The Sanno hill patent firm (JP)

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