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. 15, 1991
Filed:
Sep. 13, 1990
Toshio Kanai, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A clamping circuit of a high definition CRT display which is adapted to feed the picture signals to the cathode of the cathode-ray tube through a coupling capacitor is connected to the above described cathode, and the above described pulse clamping circuit is operated during the picture blanking period for charging the coupling capacitor so as to change the DC voltage of the cathode. A reference voltage source which conforms to the electrical potential of the black level of the above described picture signal is provided, the above described reference voltage source is connected to the picture signal output line during the picture blanking period so as to reduce the output impedance of the picture output circuit during the same period to correctly reproduce the brightness in spite of the picture signals.