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:
Oct. 19, 2004
Filed:
Aug. 10, 2001
William G. Miller, Knoxville, TN (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A cathode current limiting circuit and method, for use with projection color television display systems to prevent overheating and possible cracking of the blue cathode ray tube (CRT) when a continuous blue background is presented, monitors differences between the respective low level red, green, blue (RGB) signals sent from the video signal processor to the CRT drive which produces the respective RGB cathode or beam currents. When the low level blue signal exceeds both of the red and the green signals by a predetermined differential, the circuit sends a feedback signal to the video signal processor to limit the blue signal and, thus, the cathode current from the CRT drive.