Ferroelectric liquid crystal cell with rubbed polyimide alignment layer
Patent 4634228 Issued on January 6, 1987. Estimated Expiration Date: 
May 1, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 1, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesChiral smectic C or H liquid crystal electro-optical device Liquid crystal display element Alignment of ferroelectric LCDs Patent #: 4561726 InventorsAssigneeApplicationNo. 06/729420 filed on 05/01/1984US Classes:428/1.26, Polyimide349/132, For parallel alignment428/473.5Of polyimideExaminersPrimary: Corbin, John K.Assistant: Gallivan, Richard F. Attorney, Agent or FirmInternational ClassesC09K 19/02 (20060101)C08G 73/00 (20060101) C08G 73/10 (20060101) G02F 1/13 (20060101) G02F 1/1337 (20060101) Foreign Application Priority Data1984-05-01 JPAbstractOrientation control films are coated on a pair of transparent substrates on the side contiguous to the ferroelectric liquid crystal layer and rubbed for aligning molecules thereof. The films are made of a polyimide polymer prepared by ring closure by heating and dehydrating of a polyamic acid which is synthesized by condensing, for example, pyromellitic dianhydride with 4,4'-diaminoterphenyl. A contrast ratio of the ferroelectric liquid crystal element is improved while keeping a high response characteristic of the ferroelectric liquid crystal materials.Other References
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