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:
Jun. 21, 1988
Filed:
Apr. 04, 1986
Jean-Frederic Clerc, St. Egreve, FR;
Denis Sarrasin, Rives, FR;
Commissariat a l'Energie Atomique, Paris, FR;
Abstract
A process for the control of a matrix display such as a liquid crystal display displaying grey levels comprising a display material inserted between m electrode rows and p electrode columns which cross the rows, a material zone M.sub.i N.sub.j being excited by the application to row M.sub.i of a first series of pulse signals and to column N.sub.j of a second series of continuous signals, with i,j being integers such that 1.ltoreq.i.ltoreq.m and 1.ltoreq.j.ltoreq.p, said signals being cyclical of cycle T with polarity reversal at each half-cycle T/2, T/2 being subdivided into n time fractions equal to 2.sup.(k-1) m.tau., in which k is an integer such that 1.ltoreq.k.ltoreq.n and .tau. a time interval useful for exciting the material, the signal of the second series having a maximum of 2 n polarity reversals over a cylcle T and for each time fraction being either in phase, or in phase opposition with the signal of the first series.