CRT Digital brightness control

Details CRT Digital brightness control CRT Digital brightness control

1979-07-12

1981-02-17

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315367, 340742, 340793, H01J 2972

Patent

active

042517559

ABSTRACT:
A digitally controlled CRT display system providing display intensity levels having equal ratios of luminances for consecutive steps over a plurality of brightness control settings. The digital video is added to a digital brightness code and the sum is converted to an analog signal that is coupled to the cathode of the CRT. The digital-to-analog converter provides a transfer characteristic such that the consecutive gray shade steps have a constant ratio of luminance.

REFERENCES:
patent: 3527980 (1970-09-01), Robichaud et al.
patent: 3718832 (1973-02-01), Premru et al.
patent: 3996673 (1976-12-01), Vorst et al.

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