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:
Jul. 05, 1994
Filed:
May. 13, 1992
Mary Tilton, Jefferson, WI (US);
Lenny Lipton, Greenbrae, CA (US);
Standish Industries, Inc., Lake Mills, WI (US);
Abstract
A fast switching liquid crystal device, a method for making such a device, and eyewear incorporating the device for use in a stereoscopic viewing system. The device achieves a fast response time and high contrast by increasing the twist of the nematic material to 270 degrees and orienting the tilt angle of the material to be consistent throughout the twist. The liquid crystal device is constructed to have two transparent, essentially parallel substrates which are spaced apart by a desired cell gap distance, and on which are deposited electrodes. The electrode surfaces are coated with a polymer material which is conditioned to provide a means of aligning the director axes of the liquid crystal material, and to maintain a desired tilt angle between the director axes and the electrode surfaces. A chiral dopant is added to the nematic liquid crystal material so that the pitch of the material is approximately twice the gap distance of the cell. Polarizing filters are placed on the exterior surfaces of the substrates and are oriented to be either parallel or perpendicular to the direction of conditioning of the polymer coated electrode surfaces, and to be perpendicular to each other.