Multicolor display device using electroluminescent phosphor scre

Details Multicolor display device using electroluminescent phosphor scre Multicolor display device using electroluminescent phosphor scre

1977-12-19

1979-05-15

Smith, Alfred E.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

340704, 340760, 340781, 313463, 313494, H05B 3700, H05B 3900, H05B 4100

Patent

active

041550307

ABSTRACT:
The disclosure utilizes a memory electroluminescent (EL) layer which has brightness-voltage (B-V) characteristics with multistable hysteresis loops of one color emission. Another EL layer of second color emission is incorporated therewith for a multicolor display device. The device comprises the two EL layers fabricated in sandwich form separated from each and from the electrodes by insulating layers which are inserted for breakdown protection and isolation of the two EL layers. Certain insulating layers may be omitted if the two EL layers are made of compatible materials and the hysteresis characteristics are not effected. In steady operation, an AC voltage signal is applied to the sandwiched device to maintain a display characteristic. A superposed switching voltage or electron beam or light beam is used to trigger a desired display. The displayed image may be erased by reducing sustaining AC voltage below threshold value. The principle of this disclosure may be generalized to three or more layers so that greater flexibility of color choice is obtainable.

REFERENCES:
patent: RE24540 (1958-09-01), Michlin
patent: 3388277 (1968-06-01), Thornton
patent: 3975661 (1976-08-01), Kanatani et al.
patent: 4035775 (1977-07-01), Chang

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