Pedestal level control circuit and method for controlling pedestal level

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 7030936
APP PUB NO 20030001976A1
SERIAL NO

10184952

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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In order to reduce a circuit scale such as a brightness adjustment circuit or the number of pins in an IC chip, in the brightness adjustment circuit, a brightness adjusted video signal (internal video signal) output from an analog signal synthesis circuit or a D/A converter is input to one input terminal of a switch and a sample/hold circuit. The sample/hold circuit holds a voltage of a level in accordance with the pedestal level of the internal video signal at a timing in accordance with a sampling pulse in synchronization with the internal video signal. A clamp circuit clamps the pedestal level of an external video signal in accordance with a clamp pulse, using the voltage held by the sample/hold circuit as the reference voltage, and input it to the other input terminal. The output terminal of the switch is connected to an amplifier.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.OSAKA10842

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Sasada, Masahiko Kyoto, JP 8 32

Cited Art Landscape

Patent Info (Count) # Cites Year
 
SANYO ELECTRIC CO., LTD. (1)
5587746 Image signal processor for obtaining digital image signals 8 1995
 
ITT INDUSTRIES, INC. (1)
4494137 Integrated interface circuit between the RGB matrix and the video output stages of color-television sets 4 1982
 
RENESAS ELECTRONICS CORPORATION (1)
5995166 Clamp circuit for clamping a video signal and a circuit for superimposing composite video signals 16 1997
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
5296929 Automatic correction apparatus for video signal of digital VTR 8 1991
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
FUNAI ELECTRIC CO., LTD. (1)
* 7583322 Television and adjustment method for the same 0 2005
 
RENESAS ELECTRONICS CORPORATION (2)
* 7095452 Clamp circuit for clamping a digital video signal 5 2003
* 2004/0130,375 Clamp circuit for clamping a digital video signal 0 2003
 
HIMAX TECHNOLOGIES LIMITED (1)
* 7327297 Source driver of liquid crystal display and the driving method 0 2006
* Cited By Examiner

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