Television – Image signal processing circuitry specific to television – Gray scale transformation
Patent
1997-12-19
2000-10-24
Faile, Andrew I.
Television
Image signal processing circuitry specific to television
Gray scale transformation
348674, H04N 5202
Patent
active
061375438
ABSTRACT:
The present invention relates to a gamma-correction circuit which can prevent the deterioration of focusing in a projection television. The gamma-correction circuit comprises a gamma-correction section having an input for receiving a blue color video signal and operable to generate a gamma-corrected signal, a peak-beam current limiting section connected to the gamma-correction section and operable to compare a beam current corresponding to the blue color video signal with a predetermined peak-level value, the peak-beam current limiting section further operable to clip or pass the gamma corrected signal according to the comparison, and a video amplifying section connected to the peak-beam current limiting section and operable to amplify clipped or passed signal, and output the amplified signal to a blue color CRT.
REFERENCES:
patent: 4167025 (1979-09-01), Willis
patent: 4587554 (1986-05-01), Tamura et al.
patent: 5204748 (1993-04-01), Lagoni
Faile Andrew I.
Huang Sam
LG Electronics Inc.
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