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:
Jul. 21, 2009
Filed:
Jan. 20, 2004
Jason R. Hector, Redhill, GB;
Mark J. Childs, Wootton Bassett, GB;
David A. Fish, Haywards Heath, GB;
Mark T. Johnson, Veldhoven, NL;
Jason R. Hector, Redhill, GB;
Mark J. Childs, Wootton Bassett, GB;
David A. Fish, Haywards Heath, GB;
Mark T. Johnson, Veldhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
An active matrix display device uses an amorphous silicon drive transistor for driving a current through an LED display element. First and second capacitors are connected in series between the gate and source of the drive transistor, with a data input to the pixel provided to the junction between the first and second capacitors. The second capacitor is charged to a pixel data voltage, and a drive transistor threshold voltage is stored on the first capacitor. This pixel arrangement enables a threshold voltage to be stored on the first capacitor, and this can be done each time the pixel is addressed, thereby compensating for age-related changes in the threshold voltage.