General 2 voltage levels driving scheme for cholesterical...

Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix

Reexamination Certificate

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C345S089000

Reexamination Certificate

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06894668

ABSTRACT:
A driving scheme for chiral nematic (cholesteric) liquid crystal displays comprises a preparation step, a holding-selection step, and an evolution step. The column and row drivers require only 2 voltage levels: U or 0. Duty cycles and phases in the preparation step, the holding-selection step, and the evolution step, are varied to generate optimized contrast, brightness, and gray levels on cholesteric liquid crystal displays.

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