An improved time-sharing waveform of two-frequency multiplexing method is proposed to drive alphanumeric liquid crystal display using the dynamic scattering mode, and its display characteristics are compared with those of the well established one-frequency method and two-frequency method.
Remarkable features of the proposed method are found to be a higher crosstalk voltage and a larger voltage margin. The threshold voltages and the margins of these three multiplexing techniques calculated from the effective voltages of low and high frequency pulses exhibit relatively close agreements with experimental values.
Calculations of the effective voltages for a generalized two-frequency driving waveform having different duty cycles of high frequency pulses give an optimum duty cycle and a maximum voltage margin, which agree satisfactorily with experimental results.
The nematic liquid crystal shows similar rise times for all three types of driving waveform, but the decay responses for the two-frequency methods are slower in homeotropic alignment than in homogeneous one.
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