Television – Image signal processing circuitry specific to television – Dc insertion
Reexamination Certificate
2006-04-18
2006-04-18
Hsia, Sherrie (Department: 2614)
Television
Image signal processing circuitry specific to television
Dc insertion
C348S689000, C348S687000
Reexamination Certificate
active
07030936
ABSTRACT:
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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patent: 5587746 (1996-12-01), Nakakuki
patent: 5995166 (1999-11-01), Kawano
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patent: 11-313268 (1999-11-01), None
Hsia Sherrie
Matsushita Electric - Industrial Co., Ltd.
McDermott Will & Emery LLP
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