Liquid crystal matrix display panel drive method

Details Liquid crystal matrix display panel drive method Liquid crystal matrix display panel drive method

1985-04-18

1987-02-24

Evans, Arthur G.

Communications: electrical

Land vehicle alarms or indicators

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

340805, G05F 3147

Patent

active

046453032

ABSTRACT:
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.

REFERENCES:
patent: 4278974 (1981-07-01), Kondo

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