DISPLAY DEVICES AND METHODS OF DRIVING SUCH

摘要

A display device comprises an array (10) of pixels (12) arranged in rows and columns and drive circuitry (20,21,22,24) for providing pixel drive signals to the pixels. Each pixel is driveable with two opposite polarity signals (+,-). Each pixel is driven cyclically with a number n of phases where n is 4 or more, n/2 phases with one polarity and n/2 phases with the opposite polarity. During each phase change, the polarity of k x 2/n of the pixels of the display is changed, where k is an integer and k x 2/n is more than 0 and less than 1. Furthermore, the phases in the first half of each cycle are duplicated in the second half of each cycle with opposite polarity. This drive scheme provides a staggered change in polarity and has symmetry to remove a dc offset. Preferably, the polarity changes are always distributed uniformly across the display.