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:
Mar. 03, 1998
Filed:
Jun. 06, 1995
Applicant:
Inventor:
Yasushi Suzuki, Sayama, JP;
Assignee:
Citizen Watch Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ; G02F / ;
U.S. Cl.
CPC ...
349171 ; 349130 ; 349132 ; 349171 ; 349172 ; 349174 ; 349184 ;
Abstract
A liquid crystal panel has a memory function that is reliable for a long time. The panel employs a ferroelectric or antiferroelectric liquid crystal material involving at least two kinds of layer structures of minimum energy. The layer structures are defined at least by (1) a c-director parameter that is in parallel with substrates of the panel and has at least one minimal value, or (2) an a-director parameter that is orthogonal to the substrates and has at least one maximal value. Due to these layer structures, the panel is stable, resistant to mechanical and electrical stress, reliable in operation, and excellent in memory function.