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:
Dec. 26, 2006
Filed:
Apr. 30, 1998
Ryo Takeda, Kurashiki, JP;
Shigeharu Ochi, Niihama, JP;
Takeshi Tange, Niihama, JP;
Takao Ogawa, Kurashiki, JP;
Ryo Takeda, Kurashiki, JP;
Shigeharu Ochi, Niihama, JP;
Takeshi Tange, Niihama, JP;
Takao Ogawa, Kurashiki, JP;
STMicroelectronics Asia Pacific Pte Ltd., Singapore, SG;
Abstract
A brightness limitation system is employed in a television circuit to prevent the black reference voltage level and the video signal from entering a minimum signal clipping zone, to provide precise correction signal, limiting the brightness, to maintain a constant black reference voltage level, and maintain a video signal with dynamic amplitude. The brightness limitation circuit detects a minimum signal level amongst the black reference signals from each color channel and compares the minimum signal with a fixed voltage level to generate a brightness feedback signal. The brightness feedback signal is then used to modify the black reference signal level for each color channel.