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:
Nov. 26, 2013
Filed:
Oct. 25, 2001
Alan G. Knapp, Crawley, GB;
Neil C. Bird, Horley, GB;
Alan G. Knapp, Crawley, GB;
Neil C. Bird, Horley, GB;
Koninklijke Philips N.V., Eindhoven, NL;
Abstract
An active matrix electroluminescent display device has an array of current—driven electroluminescent display elements (), for example comprising organic electroluminescent material, whose operations are each controlled by an associated switching means () to which a drive signal for determining a desired light output is supplied in a respective address period and which is arranged to drive the display element according to the drive signal following the address period. Each switching means comprises a current mirror circuit () which samples and stores the drive signal with one transistor () of the circuit controlling the drive current through the display element () and having its gate connected to a storage capacitance () on which a voltage determined by the drive signal is stored. Through the use of current mirror circuits improved uniformity of light outputs from the display elements in the array is obtained.