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:
Mar. 09, 2004
Filed:
Sep. 19, 2001
Neil C. Bird, Horsham, GB;
David A. Fish, Haywards Heath, GB;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A bistable chiral nematic liquid crystal display has pixel address circuits which comprise a first switching device ( ) for switching a supply voltage to the remainder of the pixel address circuit and which is controlled by a row address line ( ) and a second switching device ( ) for allowing or preventing the supply voltage to be provided to the respective portion of the liquid crystal material ( ), and Controlled by a column select line ( ). This pixel layout and a method of driving the pixel address circuit, including use of a sample and hold circuit, enables a transition of the liquid crystal to the homeotropic or H state to be avoided when the pixel material is desired to remain in the P or FC states between frames, so that the black addressing bar artifact can be avoided.