Driving method for a thin-film electroluminescent element of a t

Details Driving method for a thin-film electroluminescent element of a t Driving method for a thin-film electroluminescent element of a t

1974-06-19

1976-08-17

Rolinec, R. V.

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

313494, 313498, 315176, H05B 3700

Patent

active

039756610

ABSTRACT:
Disclosed is a driving method for a thin-film electroluminescent element of a three-layer construction which emits light and exhibits the hysteresis phenomenon within the light emission versus applied voltage characteristics. The light intensity is maintained and memorized at a predetermined value in the element by the application of a train of sustaining pulses of alternating voltage, the amplitude thereof being chosen at the voltage level appearing at the point in the hysteresis loop characteristics where the difference between the maximum light brightness on the voltage decreasing curve and the minimum light brightness on the voltage increasing curve is considerably large. The sustaining light brightness is controlled by varying the amplitude or the pulse width of the sustaining pulses. The information may be written, memorized and eliminated in the EL element as variations of the light brightness. To write or eliminate the information in the EL element, it is also effective to utilize external light excitation.

REFERENCES:
patent: 3309712 (1967-03-01), Cole
patent: 3315080 (1967-04-01), Kohashi
patent: 3356899 (1967-12-01), Stone
patent: 3500101 (1970-03-01), Burns
patent: 3526801 (1970-09-01), Kruse

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