General Electric Company

William L Carl

Charles R Stein

A method for the non-scanned matrix addressing of bar displays, particularly of the liquid crystal type, for driving all 'on' elements of the display to full optical saturation and, hence, achieving uniform brightness and contrast, comprising the steps of driving the common electrodes of subordinate, 'full-on' blocks of data segments with a first waveform of amplitude and frequency differing from the data signal waveform; driving the common electrode of a transitional, 'top-of-the-bar' block of data segments with a second waveform of amplitude and frequency similar to a data signal waveform; and driving the common electrodes of the uppermost, 'off' blocks of data segments with a waveform of frequency higher than the display cut-off frequency. Apparatus is disclosed for generating and switching the required waveforms to facilitate use of such a bar display.

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Montgomeryville, PA, United States of America

William L Carl