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. 23, 1991
Filed:
Apr. 13, 1990
Applicant:
Inventor:
Jeffery B Lendaro, Noblesville, IN (US);
Assignee:
Thomson Consumer Electronics, Inc., Indianapolis, IN (US);
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H04N / ;
U.S. Cl.
CPC ...
315411 ; 358190 ;
Abstract
To produce a cathode voltage of a cathode ray tube that provides black level compensation, a secondary winding of a flyback transformer is coupled in series with a resistor, a capacitor and a rectifying diode. During flyback, a voltage pulse is developed across the capacitor at a magnitude that is increases when the average value of the beam current increases. The voltage pulse causes the cathode voltage to first decrease when the beam current increases.