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:
May. 07, 1996
Filed:
Jun. 28, 1994
Paul W Surguy, Hayes, GB;
Central Research Laboratories Limited, Middlesex, GB;
Abstract
A matrix of bistable pixels defined by ferroelectric liquid crystal material situated at the areas of overlap of row and column electrodes is addressed by blanking the rows and subsequently setting selected pixels to the unblanked state row by row by applying a select waveform (21) to the relevant row electrode while applying charge-balanced data waveforms (35 or 37) in parallel to the column electrodes. One data waveform (35) leaves the corresponding pixel in the blanked state while the other (37) switches it to the unblanked state. Each data waveform comprises a pair of contiguous pulses (39, 41 or 45, 47) the transition between which coincides with the start of the select pulse (31). In order to prepare each pixel to be switched or non-switched the first pulse (39 or 45) of each pair is longer than the select pulse (31).