Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1997-08-29
1999-11-23
Hsia, Sherrie
Television
Image signal processing circuitry specific to television
Gray scale transformation
348677, H04N 5202
Patent
active
059909790
ABSTRACT:
A gamma correction circuit is provided for gamma correcting first and second polarity video signals of different polarity. The gamma correction circuit includes first and second resistance elements R1, R2 connected in series between a power supply terminal 50 and a ground terminal 52 and a third resistance element R3 connected in parallel with the first resistance element R1 between the power supply terminal 50 and the second resistance element R2. A fourth resistance element R4 is connected in parallel with the second resistance element R2 between the ground terminal 52 and the third resistance element R3. An output terminal 54 is arranged between the first and second resistance elements R1, R2. An input transistor Tr1 is connected between the first and second resistance elements R1, R2 with its base supplied with a video signal. A first control transistor is connected between the power supply terminal 50 and the third resistance element R3. The first control transistor Tr2 is turned on with its base supplied with a first reference voltage when a first polarity video signal is input, and remains turned off the rest of the time. A second control transistor Tr3 is connected between the ground terminal 52 and the fourth resistance element R4. The second control transistor Tr3 is turned on with its base supplied with a second reference voltage when a second polarity video signal is input and remains turned off the rest of the time.
REFERENCES:
patent: 5610666 (1997-03-01), Ueda
Koyama Fumio
Miyashita Kiyoshi
Hsia Sherrie
Seiko Epson Corporation
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