Patent ID: 8704818

Claim:
A method comprising: generating display driver signals that vary between only two levels; applying the display driver signals to opposing electrodes of a display element within a display device, wherein the display driver signals comprise common drive signals and segment drive signals; and in a first mode, varying a correlation between the common drive signals and the segment drive signals to select or de-select the display element based on an average voltage magnitude across the display element over a time period, wherein the display element is activated in the first mode when the average voltage magnitude exceeds a threshold value, wherein the average voltage magnitude exceeds the threshold value when a respective one of the common drive signals and the corresponding one of the segment drive signals are correlated and the average voltage magnitude does not exceed the threshold value when the respective one of the common drive signals and the corresponding one of the segment drive signals are not correlated; and in a second mode, varying a pulse density of the display driver signals applied to the opposing electrodes to select or de-select the display element; and filtering the display driver signals applied to the opposing electrodes using electrical characteristics of at least a portion of the display device in the second mode to provide voltage levels at the display element to vary according to pulse density, wherein the display element is activated in the second mode when a second average voltage magnitude exceeds a second threshold value.