Kinescope driver apparatus with contrast enhancement

Details Kinescope driver apparatus with contrast enhancement Kinescope driver apparatus with contrast enhancement

1992-06-29

1994-05-31

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2952

Patent

active

053172400

ABSTRACT:
A high voltage, inverting, kinescope driver amplifier is coupled at the input thereof to a source of low voltage video input signals to be amplified and is coupled at the output thereof for supplying amplified video output signals to the cathode of a kinescope. The high voltage amplifier includes linear and non-linear feedback paths which, in combination, determine a nominal closed loop gain for the amplifier. The non-linear path includes amplitude and frequency dependent elements for increasing the closed loop gain of the amplifier by a given amount in low brightness areas (black to gray) displayed by the kinescope (thus improving dark picture detail) and increases the closed loop gain of the amplifier by substantially the same given amount for high frequency video detail signal components in high brightness picture areas (thus improving subjective contrast without spot blooming and avoiding the impression of "washed-out" pictures.

REFERENCES:
patent: 4118731 (1978-10-01), Hinn
patent: 4295160 (1981-10-01), Lagoni
patent: 4366440 (1982-12-01), Olson et al.
patent: 5083198 (1992-01-01), Haferl et al.

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