Intensity modulation circuit for cathode-ray tubes
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United States of America Patent
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Aug 5, 1986
Grant Date -
N/A
app pub date -
Aug 13, 1984
filing date -
Aug 12, 1983
priority date (Note) -
Expired
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Abstract
An intensity modulation circuit for a cathode-ray display device. Designating circuitry produces digital signals representative of at least two areas of the display of the cathode-ray tube. Analog signal producing circuitry produces from said digital signal analog video signals having at least two brightness grades, one of said grades being associated with each of said areas of display. Intensity modulation circuitry is coupled to the analog signal producing circuitry for varying the amplification of the analog video signal in at least one but not all of said grades. Output amplification circuitry receives the analog video signals and drives the cathode-ray tube in response thereto.
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