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. 23, 1991
Filed:
Dec. 22, 1989
Masahito Ishikawa, Yokosuka, JP;
Tomiaki Yamamoto, Chigasaki, JP;
Akio Murayama, Kamakura, JP;
Shoichi Matsumoto, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A light crystal cell comprising a pair of substrates arranged substantially parallel and provided with electrodes on their opposite surfaces, and a ferroelectric liquid crystal composition held between these substrates, two polarizers arranged on either side of said liquid crystal cell, and an optical retardation film for equalizing the states of polarization of transmitted light that has passed through parts of said liquid crystal cell of different thickness. It is preferable that this optical retardation film is inserted between the liquid crystal cell and a polarizer. The number of optical retardation films need not however be limited to one, and several such films may be used. A polarizer and optical retardation film may also be assembled as one unit.