Communications: electrical – Systems – Portable self-contained
Patent
1975-04-04
1977-04-19
Curtis, Marshall M.
Communications: electrical
Systems
Portable self-contained
340336, 350160LC, G06F 314
Patent
active
040191788
ABSTRACT:
The present disclosure is directed toward a system for driving a plurality of liquid crystal display units each having a common electrode, a plurality of segment electrodes and a liquid crystal composition interposed between the said electrodes. First, second and third voltage levels are determined with respect to a reference level in such a manner that a voltage difference between any possible combinations and the reference level except the combination of the third level and the reference level is not higher than a given threshold voltage which initiates enabling of the liquid crystal display units. When the liquid crystal display units are desired to be energized, signals of the reference level and the third level are alternatively applied to the common electrode, whereas the inversion thereof is applied to the segment electrodes. When the liquid crystal display units are desired to be disabled, a signal either of the first or second level is applied to at least one of said electrodes.
REFERENCES:
patent: 3895372 (1975-07-01), Kaji et al.
RCA Product Guide, No. CDL-820D, Publ. 8-71, p. 31.
CMOS - Why Is It So Good?, Lancaster, Radio-Electronics, Dec. 1973, pp. 33-36, 88 & 89.
Hashimoto Shintaro
Nakagawa Hirohide
Curtis Marshall M.
Sharp Kabushiki Kaisha
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