Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1991-06-18
1993-11-30
Nguyen, Hoa
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369110, 369100, 369288, 365108, G11B 713, G11B 724, G11B 902, G11B 1304
Patent
active
052672247
ABSTRACT:
An improved liquid crystal device such as an optical disc memory or a display device with a ferroelectric liquid crystal (FLC) is shown. As FLC a chiral smectic liquid crystal is employed to exhibit a hysteresis between a pair of substrates which have easy polarization axes normal to each other. Information to be recorded are written on the disc in terms of a binary system by use of the hysteresis. A ferroelectric layer contiguous to the liquid crystal makes the nonvolatility of the memory sure.
REFERENCES:
patent: 4405993 (1983-09-01), Kahn et al.
patent: 4835751 (1989-05-01), Yamazaki
patent: 4845695 (1989-07-01), Yamazaki
patent: 4853911 (1989-08-01), Yamazaki
Nguyen Hoa
Semiconductor Energy Laboratory Co,. Ltd.
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