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Patent Searching and Data


Title:
OPTICAL SHEET FOR BACKLIGHT UNIT AND BACKLIGHT UNIT
Document Type and Number:
WIPO Patent Application WO/2017/104677
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide an optical sheet for a backlight unit with which the occurrence of hot spots can be suppressed. This optical sheet for a backlight unit is for a liquid crystal display device, with which light rays emitted from an LED light source are guided to the front surface side, the optical sheet being characterized by being provided with one or more resin layers and in that a plurality of fine grooves oriented in a specific direction are formed on the front surface side or reverse surface side of at least one of these resin layers. Preferably, the mean number of the plurality of fine grooves per unit length of the plurality of fine grooves in the direction perpendicular to the mean orientation direction is 10 to 10,000 grooves/mm. Preferably, the arithmetic mean roughness(Ra) of the direction perpendicular to the orientation direction of the plurality of fine grooves on the surface of the resin layer(s) on which the plurality of fine grooves are formed is 0.01 to 5 ìm. The plurality of fine grooves may c onstitute a diffraction grating.

Inventors:
HARADA KENICHI (JP)
NAMIKAWA YOSHITADA (JP)
FUKUDA TADAYOSHI (JP)
MATSUNO YUKI (JP)
Application Number:
PCT/JP2016/087122
Publication Date:
June 22, 2017
Filing Date:
December 13, 2016
Export Citation:
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Assignee:
KEIWA INC (JP)
International Classes:
G02B5/02; B32B7/02; F21S2/00; F21V3/00; F21V3/04; G02B5/18; G02F1/13357; F21Y115/10
Foreign References:
JP2012226290A2012-11-15
JP2009300989A2009-12-24
JP2002098810A2002-04-05
JP2003050306A2003-02-21
Attorney, Agent or Firm:
AMANO Kazunori (JP)
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