Title:
LIGHT DIFFUSING PLATE USED FOR POINT LIGHT SOURCES, AND DIRECT-LIGHTING POINT-LIGHT-SOURCE BACKLIGHT DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/030594
Kind Code:
A1
Abstract:
Provided is a light diffusing plate in a direct-lighting point-light-source backlight using point light sources, the light diffusing plate making it possible to, without use of a number of optical films, compatibly achieve excellent luminance, luminance uniformity (in frontal and diagonal view fields) and color unevenness characteristic with the thickness of the backlight set as desired and with the reduced number of point light sources. Specifically, provided is a light diffusing plate used for point light sources, which has a plurality of convex portions formed on a surface thereof, wherein: each of the convex portions has a substantially triangular-pyramid shape having a triangular bottom; and the slope angle (θ) of each side of the substantially triangular-pyramid shape with respect to the bottom, and the refraction index (A) of a material forming the convex portions satisfy the following expressions (1) and (2): (1) … θ ≥ -40A° + 115.2° (2) … θ ≤ 25A° + 22.25°
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Inventors:
MAEKAWA TOMOFUMI (JP)
KONDO MASAAKI (JP)
KONDO MASAAKI (JP)
Application Number:
PCT/JP2010/059979
Publication Date:
March 17, 2011
Filing Date:
June 11, 2010
Export Citation:
Assignee:
ASAHI KASEI E MATERIALS CORP (JP)
MAEKAWA TOMOFUMI (JP)
KONDO MASAAKI (JP)
MAEKAWA TOMOFUMI (JP)
KONDO MASAAKI (JP)
International Classes:
G02B5/02; F21S2/00; G02F1/1335; G02F1/13357; F21Y101/02
Foreign References:
| JP2007178875A | 2007-07-12 | |||
| JP2007227410A | 2007-09-06 | |||
| JP2007179036A | 2007-07-12 | |||
| JP2006119561A | 2006-05-11 | |||
| JPH10246805A | 1998-09-14 | |||
| JPH078805U | 1995-02-07 | |||
| JPH05196808A | 1993-08-06 |
Attorney, Agent or Firm:
INABA, Yoshiyuki et al. (JP)
Yoshiyuki Inaba (JP)
Yoshiyuki Inaba (JP)
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