Method of improving the memory effect and brightness of an alter

Details Method of improving the memory effect and brightness of an alter Method of improving the memory effect and brightness of an alter

1979-03-05

1981-06-23

La Roche, Eugene R.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

3151693, H05B 3308

Patent

active

042753368

ABSTRACT:
A method for improving the memory effect and brightness of an alternating current (AC) excited thin film electroluminensence (ACTEL) device is described. A typical ACTEL device has a thin luminescent layer made of ZnS thin film doped with Mn which is sandwiched between two dielectric layers. ACTEL devices exhibit a brightness versus voltage amplitude hysteresis loop which is commonly referred to as the memory effect. The application of a hybrid AC excitation waveform to the ACTEL device provides increased brightness and improved memory effect stability. The hybrid waveform has an initial portion that is sufficiently high for efficient carrier generation and a remaining waveform portion that is at a lower level than the initial portion for charge collection and holding purposes.

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Hakki, Solid-State Acoustoelectric Light Scanner, Applied Physics Letters, vol. 11, No. 5, Sep. 1, 1967, pp. 153-155.

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