Complex waveform multiplexer for liquid crystal displays

Details Complex waveform multiplexer for liquid crystal displays Complex waveform multiplexer for liquid crystal displays

1987-10-08

1989-08-15

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340802, 340805, 350332, 350333, G09G 336

Patent

active

048579068

ABSTRACT:
A matrix display drive circuit is disclosed which generates multilevel and multiphase, time-variant drive waveforms for driving the rows and columns of a ferrolectric liquid crystal matrix display. The circuit can provide up (write) and down (erase) pulses selectively to each pixel of the display using standard twisted-nematic type liquid crystal display drivers. A complex waveform generator provides multilevel, multiphase control signals to the supply voltage inputs of the drivers. Timing and synchronizing signals are extracted from the graphics data and timing source outputs to allow such multilevel, multiphase signals as may be required for the effective multiplexing of the display matrix.

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Shimoda et al., "Optimum Bias Condition for Multiplex Driving of the Chiral Smectic C LCD", Japan Display (1986), pp. 460-462.

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