Four-level voltage supply for liquid crystal display

Details Four-level voltage supply for liquid crystal display Four-level voltage supply for liquid crystal display

1976-05-11

1977-09-20

Curtis, Marshall M.

Communications: electrical

Systems

Portable self-contained

340336, 350160LC, G06F 314

Patent

active

040500640

ABSTRACT:
A liquid crystal display enabling circuitry wherein the backplate electrode of a liquid crystal display is activated by a four-level voltage while the respective segment electrodes thereof are activated by a two-level voltage. This includes at least two input terminals, five output terminals, a voltage dividing resistor network and complementary MOSFET switching means and thereby provides the four-level voltage for the backplate electrode and the four-level voltage for the segment electrodes. In addition, this may be implemented with MOS integrated circuitry technology (and not bipolar integrated circuitry technology).

REFERENCES:
patent: 3911421 (1975-10-01), Alt et al.
patent: 3936676 (1976-02-01), Fujita
patent: 3995942 (1976-12-01), Kawakami et al.

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