Citizen Watch Company, Ltd.

Hiroshi Shimizu

Fukuo Sekiya

Takaharu Suzuki

An improved drive method is disclosed for a liquid crystal matrix display panel having display elements driven by a set of common conductors which are successively addressed during row selection intervals and a set of segment conductors to which data signals are applied, whereby the number of transitions of polarity of the drive voltage applied to each display element during a non-selection interval for that display element in each frame, as measured over any four successive frame intervals, is made independent of the display pattern formed by the column of display elements containing that display element, with the polarity transitions being distributed substantially uniformly throughout each set of four frame intervals. Contrast variations which arise with prior art drive methods for large-area high element-density displays, due to pattern-dependent effects resulting from matrix conductor resistance and display element capacitance, are thereby completely eliminated.

Liquid crystal matrix display panel drive method

A liquid crystal color display cell utilizing a Guest-host effect and capable of displaying at least two colors whose color phases are different from each other. The cell comprises a liquid crystal layer sandwiched between a pair of opposed substrates and composed of liquid crystal molecules inclined at an angle within a range between 60.degree. and 90.degree. with respect to each of the substrates. The inclination of the liquid crystal molecules is aligned in one direction and the liquid crystal molecules have a twisted construction between the substrates.

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Kawagoe, Japan

Hiroshi Shimizu