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:
Nov. 27, 2007
Filed:
May. 20, 2004
Jibing Lin, Fremont, CA (US);
Suning Tang, Fremont, CA (US);
Yuanji Tang, Palo Alto, CA (US);
Masami Aihara, San Jose, CA (US);
Jibing Lin, Fremont, CA (US);
Suning Tang, Fremont, CA (US);
Yuanji Tang, Palo Alto, CA (US);
Masami Aihara, San Jose, CA (US);
Alps Electric (USA) Inc., Campbell, CA (US);
Abstract
A thin holographic optical switch used in a liquid crystal display device contains opposing transparent substrates transparent electrodes between the substrates and a diffraction grating between the electrodes. The diffraction grating contains regions of transparent polymerized photopolymers and cholesteric liquid crystal micro-droplets. Refractive indexes of the photopolymers and liquid crystal are substantially the same when the electrodes have the same potential. The holographic optical switch transmits broadband LED light when the potential difference between the electrodes is zero and is polarization independent. The holographic optical switch diffracts broadband LED light when the potential difference between the electrodes is non-zero and is polarization independent.