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:
Oct. 03, 1995
Filed:
Jun. 27, 1994
Chang H Noh, Suwon, KR;
T Asada, Kyoto, JP;
Samsung Electron Devices Co., Ltd., Kyunggi, KR;
Abstract
A liquid crystal optical shutter is disclosed. The liquid crystal optical shutter comprises two sheets of transparent, conductive substrates; a light-adjusting layer supported between the sheets, which comprises a transparent, thin film of polymer prepared by photopolymerizing prepolymers containing approximately 20 to approximately 60% by weight of urethaneacrylate; and a liquid crystal component selected from the group consisting of a cholesteric liquid crystal, a chiral smectic liquid crystal and the mixture thereof, said liquid crystal being encapsulated within said thin film. Superior in operating voltage, transmissivity and response time, the liquid crystal optical shutter is characterized by specifying a concentration range of the nematic liquid crystal, the base liquid crystal and introducing a flexible polytetramethylene chain with intermediate sizes into the polymer. The specific range and introduction allow the liquid crystal optical shutter to be operated at low voltages without delayed response time and have improved impact resistance. The liquid crystal optical shutter is operable at relatively low voltages of 3 to 12 V with t.sub.r +t.sub.d of 8 to 16 ms and a maximum contrast ratio of at least 120:1.