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. 06, 1982
Filed:
Apr. 30, 1980
Applicant:
Inventors:
Jean-Pierre Asmus, Marly-le-Roi, FR;
Joseph Soto, Montrouge, FR;
Sebastianus J Op Het Veld, Eindhoven, NL;
Henri W Schneider, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H01J / ; A63B / ; G09F / ;
U.S. Cl.
CPC ...
358 22 ; 315380 ; 2731 / ; 273D / ; 340713 ; 340723 ; 358220 ;
Abstract
To prevent display screen burn-in of a picture having, for example, bright lines or other picture components remaining stationary for a long period of time, a video circuit is examined to detect how long the information has not been changed. If a predetermined time limit is exceeded, the picture brightness is limited to a sufficiently low average value or, if so desired, to zero brightness, by means of one or more protection switches.