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:
Sep. 21, 2010
Filed:
Feb. 24, 2005
Mark Thomas Johnson, Eindhoven, NL;
Guofu Zhou, Eindhoven, NL;
Johannes Petrus Van DE Kamer, Heerlen, NL;
Mark Thomas Johnson, Eindhoven, NL;
Guofu Zhou, Eindhoven, NL;
Johannes Petrus Van De Kamer, Heerlen, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An electrophoretic display that is switchable between a grayscale updating mode and a monochrome updating mode. The monochrome updating mode provides for extreme pixel states only including black and white, whereas the grayscale updating mode provides for an intermediate grayscale pixel state. A suitably selected transition signal is applied when switching from the grayscale updating mode to the monochrome updating mode. The transition signal involves a drive pulse that serves to reduce the level of remnant DC voltage otherwise occurring in each pixel due to differences in the grayscale updating mode and the monochrome updating mode.