The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2014
Filed:
Dec. 12, 2012
Industrial Technology Research Institute, Hsinchu, TW;
Yi-Ping Hsieh, Changhua County, TW;
Hui-Lung Kuo, Taipei, TW;
Jui-Fa Chang, Hsinchu, TW;
Mei-Chih Peng, Taoyuan County, TW;
Yi-Chang Du, Miaoli County, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A light efficiency enhancing optical device is disclosed, including a cholesteric liquid crystal film, a quarter wave plate disposed on a light out-going surface of the cholesteric liquid crystal film and an optical compensating film disposed on a light out-going surface of the quarter wave plate, wherein the optical compensating film includes a positive birefringence C-plate, and a composite optical compensating film with combination of the optical compensating film and the quarter wave plate has in-plane phase retardation Rof 100 nm˜170 nm and out-of-plane phase retardation Rof 0 nm˜400 nm.