Thin-film EL image display panel

Details Thin-film EL image display panel Thin-film EL image display panel

1980-05-29

1982-12-28

Murray, Richard

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 314

Patent

active

043665047

ABSTRACT:
To obtain a half-tone display, the device disclosed employs a thin-film EL display panel and practices amplitude and pulse-width modulation wherein the amplitude and pulse-width of a pulse voltage applied to the thin-film EL display panel is varied according to video signals. In one preferred form thereof, a constant current amount or an enabling period of a constant current element provided within a discharge circuit is varied according to video signals, thereby controlling a pre-charge amplitude on the thin-film EL panel. The amount of discharging the pre-charge on the EL panel is under the control video signals. As a result, the brightness of the EL display panel corresponds to video signals.

REFERENCES:
patent: 3021387 (1962-02-01), Rschman
patent: 3293356 (1966-12-01), Aiken
patent: 3752910 (1973-08-01), Lewis
patent: 3765011 (1973-10-01), Sawyer et al.
patent: 4234821 (1980-11-01), Kako et al.

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