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:
Jan. 09, 1990
Filed:
Jul. 17, 1987
Applicant:
Inventors:
Peter F Blomley, Bishop's Stortford, GB;
Peter J Ayliffe, Stansted, GB;
Ewen R Huffman, Bishop's Stortford, GB;
Gregory W Yuen, Bishop's Stortford, GB;
Assignee:
STC PLC, London, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340784 ; 340805 ; 340811 ; 350333 ;
Abstract
A drive circuit for a liquid crystal display uses a sampling technique to derive drive signals from a pair of input waveforms. The waveforms comprise positive going and negative going trapezoidal pulses. By sampling the waveforms at appropriate points, single cycle AC signals and zero voltage signals can be provided. The technique subjects the drive circuit to a voltage stress that is lower than that provided by conventional techniques.