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:
Feb. 18, 1986
Filed:
Mar. 17, 1983
Charles R Stein, Schenectady, NY (US);
John E Bigelow, Clifton Park, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Methods for matrix addressing a liquid crystal display, utilizing the cholesteric-to-nematic phase change for information display, provides a voltage to each of a plurality of scanned electrodes. A preferred voltage waveform has a first non-zero value during an erase interval and a greater non-zero value during a display-write interval. The combined erase and write intervals occur, for each scanned electrode, once during a multiplex time interval. Each of another plurality of electrodes, arranged adjacent to the remaining surface of a liquid crystal layer and perpendicular to the scanned electrodes, are sequentially energized with a non-zero voltage having a polarity change coincident with the erase and write intervals when that portion of a display at the intersection of the first and second plurality of electrodes is to be addressed. If the inverted-polarity voltage is in phase with the scan electrode voltage, the liquid crystal material is switched to the cholesteric state and absorbs incident light, whereas if the inverted-polarity voltage is out-of-phase with the scan electrode erase-write pulse, the intersection is switched to the nematic state and incident light is transmitted through the cell substantially without attenuation.