Title:
直下型バックライト
Document Type and Number:
Japanese Patent JP4793263
Kind Code:
B2
Abstract:
A novel anisotropic diffusion film has a high brightness, high luminance uniformity ratio and a high productivity, and is suitable essentially for a surface light source of planar display devices for liquid crystal display devices and the like, such as a direct backlight. In the anisotropic diffusion film, a stripe-shaped convex lens is formed on one surface of a substrate film. The cross sectional shape of a plane vertical to the stripe direction satisfies the following conditions that (A-C) and the whole of light transmittance of the anisotropic diffusion film is 70% or more. A: The contour of the projecting part of the cross sectional shape is a curved line. B: The aspect ratio of the projecting part of the cross sectional shape is 1 or more but not more than 3. C: the distance between the apexes of the adjacent projecting parts of the cross sectional shape is 10µm or more but not more than 100µm.
Inventors:
Kozo Takahashi
Akikazu Kikuchi
Hiromitsu Takahashi
Akikazu Kikuchi
Hiromitsu Takahashi
Application Number:
JP2006514736A
Publication Date:
October 12, 2011
Filing Date:
June 14, 2005
Export Citation:
Assignee:
TORAY INDUSTRIES,INC.
International Classes:
G02B5/02; G02B3/00; G02B5/04; G02F1/1335; G02F1/13357
Domestic Patent References:
| JPH10166484A | 1998-06-23 | |||
| JP2003140150A | 2003-05-14 | |||
| JPH11142622A | 1999-05-28 |
Attorney, Agent or Firm:
Shinichi Ogawa
Takashi Noguchi
Kazuhiko Saishita
Takashi Noguchi
Kazuhiko Saishita