Title:
OPTICAL SHEET, LIQUID CRYSTAL DISPLAY DEVICE, AND OPTICAL SHEET TESTING METHOD AND MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2021/060282
Kind Code:
A1
Abstract:
The present invention provides an optical sheet with which light unevenness is suppressed, a liquid crystal display device, and an optical sheet testing method and manufacturing method. This optical sheet is provided with a base material layer, and an optical functional layer having a plurality of light transmitting parts arranged with a predetermined interval therebetween along the base material layer, and a louver part disposed between the light transmitting parts adjacent to each other. The optical sheet has a hanging amount of 10 mm or less when being disposed on a support base with one end thereof being protruded by 100 mm from an end part of the support base along a direction in which the plurality of light transmitting parts and the louver parts of the optical functional layer are alternately arranged, and the optical sheet is not cracked when being bent so as to be wound around a mandrel with a diameter of 150 mm along a direction orthogonal in the surface of the optical sheet to the direction in which the plurality of light transmitting parts and the louver parts of the optical functional layer are alternately arranged, and/or the optical sheet has a water absorption of 1.33% or less in a water absorption test based on JIS K 7209.
Inventors:
KASHIWAGI TSUYOSHI (JP)
Application Number:
PCT/JP2020/035812
Publication Date:
April 01, 2021
Filing Date:
September 23, 2020
Export Citation:
Assignee:
DAINIPPON PRINTING CO LTD (JP)
International Classes:
G02B5/00; F21S2/00; F21V5/00; G01M11/00; G02F1/13357
Foreign References:
| JP2010217871A | 2010-09-30 | |||
| JP2018205640A | 2018-12-27 | |||
| JP2008096930A | 2008-04-24 | |||
| JP2005049795A | 2005-02-24 |
Attorney, Agent or Firm:
TANAKA Shinichiro et al. (JP)
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