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. 05, 2001
Filed:
Aug. 12, 1997
Jeremy N. Sandoe, Horsham, GB;
John R. Hughes, Horley, GB;
U.S. Philips Corporation, New York, NY (US);
Abstract
An active matrix display device of the kind having two terminal non-linear switching devices (,) such as thin film diodes connected in series with the electro-optic, e.g. LC, display elements (,) between associated row and column address conductors (,), in which the display elements are driven using pulse width modulated data signals and a wide range of grey-scale levels is achieved by using selection signals whose form is determined such that the current flow through the switching devices upon selection is controlled in an appropriate manner. To this end, the selection signals can be shaped to provide a more constant charging level the selection period.