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. 09, 1991
Filed:
Sep. 11, 1989
Applicant:
Inventor:
Phillip T Nash, Sunnyvale, CA (US);
Assignee:
Tandy Corporation, Fort Worth, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
3503 / ; 3503 / ; 340713 ;
Abstract
A system for maintaining the contrast of an LCD at a constant level despite variations in temperature of the liquid crystal medium includes a temperature sensor and digital circuitry for generating a correction voltage that offsets the change in contrast level caused by the change in operating temperature.
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Nash, Phillip. (1991). Lcd contrast adjustment system (U.S. Patent No. 5029982). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5029982
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