Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1984-08-13
1986-08-05
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
340744, H01J 2952, G09G 114
Patent
active
046045554
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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Blum Theodore M.
Cain David
Seiko Epson Corporation
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