Video display system employing drive pulse of variable amplitude

Details Video display system employing drive pulse of variable amplitude Video display system employing drive pulse of variable amplitude

1974-05-13

1977-05-03

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

315169TV, 358153, 358168, H04N 570, H05B 3702

Patent

active

040216071

ABSTRACT:
A video display system employs a flat panel of the X-Y matrix type with a brightness control circuit in which both the amplitude and the duration of driving pulses for the display panel are varied in response to variations in the sequentially sampled level of input video signals. In a preferred brightness control circuit, variations in the sequentially sampled level of the input video signals are converted into digitally coded signals which selectively energize respective pulse generators operative to produce pulses of correspondingly weighted durations and amplitudes which overlap in time, and such pulses are combined to provide the amplitude- and width or duration-modulated driving pulses for the display panel.

REFERENCES:
patent: 3627924 (1971-12-01), Fleming et al.
patent: 3696393 (1972-10-01), McDonald
patent: 3752910 (1973-08-01), Lewis
patent: 3761617 (1973-09-01), Sato et al.
patent: 3801864 (1974-04-01), Yamane et al.
patent: 3803449 (1974-04-01), Schmersal
patent: 3883778 (1975-05-01), Kaji et al.

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