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1. (WO2013146822) EDGE LIGHT-TYPE BACKLIGHT DEVICE AND LIGHT DIFFUSION MEMBER

Pub. No.:    WO/2013/146822    International Application No.:    PCT/JP2013/058869
Publication Date: Fri Oct 04 01:59:59 CEST 2013 International Filing Date: Wed Mar 27 00:59:59 CET 2013
IPC: F21S 2/00
F21V 3/00
F21V 5/00
F21V 5/02
G02B 5/02
G02B 5/04
G02F 1/13357
F21Y 101/02
Applicants: KIMOTO CO., LTD.
株式会社 きもと
Inventors: YOKOTA, Hiroshi
横田 浩史
TAKAI, Masashi
高井 雅司
Title: EDGE LIGHT-TYPE BACKLIGHT DEVICE AND LIGHT DIFFUSION MEMBER
Abstract:
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 orthogonal to a direction along the one end part of the light guide plate is within an angle range of 48-58° 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 -90° or 90° with respect to the normal line from the angle range of the peak of the emitted light distribution. With this edge light-type backlight device, high frontal brightness and diffusion are effected which make use of the characteristics of a prism sheet with a high index of refraction.