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:
May. 25, 1993
Filed:
Jan. 16, 1992
Applicant:
Inventor:
Nobuyuki Okamoto, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ;
U.S. Cl.
CPC ...
358165 ; 358 33 ; 358 34 ; 358171 ; 358 10 ; 358139 ;
Abstract
A display device testing circuit includes a false video signal generator for producing a false video signal from a blanking pulse of the display device in a state where no video signal is connected to an input terminal of the display device, so that such false video signal is supplied to the video amplifier. A false clamp pulse generating circuit produces a false clamp pulse from the blanking pulse and supplies the false clamp pulse to a pedestal clamper in the video amplifier, thereby realizing a simplified test of the video amplifier at low cost.