Communications: electrical – Systems – Portable self-contained
Patent
1975-09-15
1977-06-07
Trafton, David L.
Communications: electrical
Systems
Portable self-contained
315169R, 340166EL, 340173LT, 350160LC, G02F 113, H01J 1748
Patent
active
040286924
ABSTRACT:
A matrix array of liquid crystal cells is defined by overlapping pluralities of row and column conductors confining a layer of liquid crystal material. Each row conductor is connected through a bilateral threshold switch to one side of a source of periodic alternating polarity sustain signals, and the column conductors are sequentially connected to the other side of the source. When an initial charge is deposited on selected ones of the capacitors forming the liquid crystal cells, the series combination of the resulting stored voltage and the sustain signals is sufficient to exceed the threshold of the bilateral switch, thereby connecting the previously selected cells to the source of alternating source on a column-by-column basis so as to recharge the previously selected cells. Since charged cells exhibit differing electro-optic properties from uncharged cells, a graphical image may be generated and stored without the need for information-bearing refresh signals.
REFERENCES:
patent: 3609747 (1971-09-01), Ngo
patent: 3763468 (1973-10-01), Ovshinsky et al.
patent: 3824003 (1974-07-01), Koda et al.
patent: 3840695 (1974-10-01), Fischer
patent: 3895373 (1975-07-01), Freiser et al.
patent: 3904924 (1975-09-01), Hilsum et al.
patent: 3932026 (1976-01-01), Sprokel
Bell Telephone Laboratories Incorporated
Ryan William
Slusky Ronald D.
Trafton David L.
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