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:
Apr. 17, 1990
Filed:
Jul. 01, 1988
Applicant:
Inventor:
Peter W Ross, Stansted, GB;
Assignee:
STC PLC, London, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ; G09G / ;
U.S. Cl.
CPC ...
350332 ; 3503 / ; 3503 / ; 340713 ; 340805 ;
Abstract
The working temperature range of a 2 .mu.m thick negative dielectric anisotropy smectic C phase filled ferroelectric liquid crystal cell that is addressed on a matrix basis with balanced bipolar data pulses and unipolar strobe pulses is extended by the inclusion of a temperature sensor to use the temperature of the cell to control the magnitudes of the data and strobe pulse waveforms and to provide, at least at high temperatures, a stabilization waveform with a frequency twice the fundamental frequency of the data pulse waveform.