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. 10, 1998
Filed:
Aug. 30, 1994
Leonid Shapiro, Lakeside, CA (US);
Robert W Shaw, Escondido, CA (US);
Proxima Corporation, San Diego, CA (US);
Abstract
A new and improved ferroelectric liquid crystal display system having a matrix structure of pixel elements each including a transistor active switching device and a ferroelectric cell. Each switching device is coupled to an individual storage capacitor which is charged during each row select time when the switching device is activated, and which is discharged during each frame time when the switching device is deactivated. A plurality of multi-level or analog column drivers supply selected drive currents to charge individually the storage capacitors of a row of pixel elements to desired initial voltage levels corresponding to desired gray scale levels for the pixel elements during a row select time to maintain the liquid crystal pixel images for lengths of time proportional to the initial charge levels of the capacitors, which discharge until their individual voltages reach a threshold voltage within predetermined discharge times during one frame time.