Non-crystalline device memory array

Details Non-crystalline device memory array Non-crystalline device memory array

1974-12-09

1976-09-07

Stolwein, Walter

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250338, 307117, 340173R, H01J 3912

Patent

active

039795861

ABSTRACT:
An erasable optical memory array having at each storage location a non-crystalline, semiconductor threshold switching device. The threshold voltage of each switching device is strongly temperature dependent and each switching device has a finite recovery time when switched to its low resistance state. Means are provided for periodically sampling each of the switching devices with voltage pulses repetitive at a first frequency and having a first voltage level sufficient to switch to the low resistance state only those switching devices heated above room temperature by a thermal image. Additional means are provided to sample the switching devices at a second frequency greater than the first frequency and at a voltage level less than that of the first voltage level to maintain the switched devices in the low resistance state upon removal of the thermal image.

REFERENCES:
patent: 3343004 (1967-09-01), Ovshinsky
patent: 3629863 (1971-12-01), Neale
patent: 3767928 (1973-10-01), Bishop et al.
patent: 3801966 (1974-04-01), Terao
patent: 3827033 (1974-07-01), Quilliam
patent: 3846767 (1974-11-01), Cohen
patent: 3906537 (1975-09-01), Thornburg et al.

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