Title:
導光板、面光源装置及び液晶ディスプレイ
Document Type and Number:
Japanese Patent JP4152605
Kind Code:
B2
Abstract:
A surface light source device and LCD provide a visual angle highly uniform two-dimensionally and reduced fine brightness unevenness, utilizing a light guide plate. The surface light source device illuminating an LCD panel employs a light guide plate having a back face 34 provided with many micro-reflectors 20. Beams P1, P2 representing an inner input light is inner-reflected by a slope 21 and then by another slope 22 or 22 and then 21, becoming an inner out light Q1, Q2 proceeding toward an emission face 33. Postures of micro-reflectors 20 are deviated from a standard posture on x-axis, y-axis and z-axis, respectively, thereby causing beams Q1, Q2 to inner-impinge to the emission face 33 at proceeding directions which are different three-dimensionally from each other. This difference is amplified through refraction at emission from the emission face 33. Fine brightness unevenness appearing depending on formed-position/no-formed-position of micro-reflectors is suppressed because the inner output light has a flux already expanded when reaching the emission face 33.
Inventors:
Shingo Okawa
Application Number:
JP2001163234A
Publication Date:
September 17, 2008
Filing Date:
May 30, 2001
Export Citation:
Assignee:
Enplus Inc.
International Classes:
G02B6/00; F21V8/00; G02F1/1335; G02F1/13357; F21Y101/02; F21Y103/00
Domestic Patent References:
| JP5127157A | ||||
| JP4136977A | ||||
| JP2002296425A |
Foreign References:
| WO2000049432A1 |
Attorney, Agent or Firm:
Matsuji Takemoto
Hideo Sugiyama
Koichi Yuda
Uozumi Takahiro
Akio Shionoiri
Hideo Sugiyama
Koichi Yuda
Uozumi Takahiro
Akio Shionoiri