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:
Nov. 09, 1993
Filed:
Sep. 26, 1991
Applicant:
Inventors:
Assignee:
GEC--Marconi Limited, , GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G09C / ;
U.S. Cl.
CPC ...
345 97 ; 359 55 ; 359 56 ; 359 84 ; 359 85 ;
Abstract
In a method of driving a ferroelectric liquid crystal display, a blanking pulse of width 2t.sub.s followed, after a delay of n.multidot.t.sub.s (where n is an integer), by a writing pulse of width t.sub.s and of opposite polarity to the blanking pulse are applied to successive row address lines at intervals of 2t.sub.s. Pairs of bipolar data pulses of width t.sub.s are applied to column address lines so that the data pulses coincide with the blanking pulse applied to the ith row and the writing pulse applied to row i-(n+1)/2 for odd values of n and to row 1-(n+2)/2 for even values of n. The data pulse amplitude may be varied in order to obtain variable grey levels in the display.