Information storage and frequency converter for liquid crystal d

Details Information storage and frequency converter for liquid crystal d Information storage and frequency converter for liquid crystal d

1975-02-28

1977-01-25

Curtis, Marshall M.

Communications: electrical

Systems

With specific power supply

340324M, 340166EL, G09F 932

Patent

active

040054039

ABSTRACT:
A general-purpose LSI (large-scale integrated circuit) computation circuit provides segment signals of high frequency at respective ones of its output terminals for displaying the computation results. It is necessary to provide a pulse frequency and pulse width converter in order to adapt the segment signals from the computation circuit to a form compatible with liquid crystal display units. There are provided flip-flops and normally closed switches for feeding the output signals of the flip-flops back to the input terminals of the flip-flops in order to temporarily maintain the segment signals within the converter. The input terminals of the flip-flops are connected with the respective ones of the output terminals of the computation circuit through normally open switches. The input terminals of the flip-flops are also connected with the respective segment electrodes of the liquid crystal display units. Synchronization between closing of the normally open switches and opening of the normally closed switches enables updating of the contents of the flip-flops, thereby achieving the reduction of the necessary number of terminals for the converter.

REFERENCES:
patent: 3280341 (1966-10-01), DuVall
patent: 3723749 (1973-03-01), Shapiro

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