Method of multiplexing liquid crystal displays

Details Method of multiplexing liquid crystal displays Method of multiplexing liquid crystal displays

1977-03-11

1978-10-17

Trafton, David L.

Communications: electrical

Systems

With specific power supply

307209, 307262, 307270, 350332, G02F 113, H03K 112

Patent

active

041212037

ABSTRACT:
A liquid crystal display is multiplexed by the digit input being driven between a first and second voltage level and the segment input being driven between the second and a third voltage level. The difference between the first and third voltage level is sufficient to activate the liquid crystal device. For AC liquid crystal displays, a polarity reversal circuit, driven by a low frequency signal, is included for both the digit input and the segment input to cause the digit input to vary between the second and third voltage level while the segment input varies between the first and second voltage level.

REFERENCES:
patent: 3896430 (1975-07-01), Hatsukano
patent: 3936676 (1976-02-01), Fujita
patent: 3949242 (1976-04-01), Hirasawa et al.
patent: 3995942 (1976-12-01), Kawakami et al.
patent: 4050064 (1977-09-01), Hashimoto et al.

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