Communications: electrical – Systems – Portable self-contained
Patent
1976-06-23
1977-11-29
Curtis, Marshall M.
Communications: electrical
Systems
Portable self-contained
340336, 350160LC, G09F 932
Patent
active
040608026
ABSTRACT:
A liquid crystal display element-driving circuit wherein output signals from a decoder for decoding coded time data are supplied to a plurality of exclusive OR gates through the corresponding NAND gates; an output signal from a liquid crystal driving pulse generator is sent forth in common to the exclusive OR gates, and outputs from the respective exclusive OR gates are conducted to the corresponding segment electrodes of the liquid crystal display element, and which further comprises first and second logical level voltage-generating circuits; switch circuits controlled by said first and second logical level voltage-generating circuits, whereby all the segment electrodes can be impressed with voltage having the same logical level by means of said first and second logical level voltage-generating circuits and corresponding switch circuits.
REFERENCES:
patent: 3911421 (1975-10-01), Alt et al.
patent: 3936676 (1976-03-01), Fujita
patent: 3949242 (1976-04-01), Hirasawa
patent: 3969717 (1976-07-01), Hatsukano
patent: 3969719 (1976-07-01), Sirocka
patent: 4005403 (1977-01-01), Washizuka et al.
Fairchild, TTL Family (Catalog), Oct., 1970, p. 52.
Curtis Marshall M.
Tokyo Shibaura Electric Co. Ltd.
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