Abstract
Abstract— Capacitive feedthrough of the trailing edge of the row-select voltage pulse in LCD matrices with non-linear resistances (NLRs) leads to a change of the just-written pixel voltage. This effect is called “kickback.” It can be compensated for by changing the select-voltage value. Because of the varying pixel capacitance, the compensation is perfect for one pixel voltage only, e.g., mid-grey. In NLR-matrix LCDs with four-level row drive, this leads to an increased pixel-voltage range. With the right select-voltage value and a smaller gain of the column voltage, the desired pixel-voltage range is obtained. In D2R displays, which use a five-level row-drive signal, dc shift and 25-Hz flicker will occur for all other pixel-voltage values. With the right choice of the select voltages and unequal gains of the column voltage for positive and negative pixel voltages, the dc shift and 25-Hz flicker of both black and white pixels can be made zero. Formulas are presented for the various cases.
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