DRIVING METHODS FOR COLOR DISPLAY DEVICES

摘要

The present invention provides driving methods for electrophoretic color display devices. The backplane system used for the driving methods is found to be simpler which renders color display devices more cost effective. More specifically, the driving method comprises first driving all pixels towards a color state by modulating only the common electrode, followed by driving all pixels towards their desired color states by maintaining the common electrode grounded and applying different voltages to the pixel electrodes.

主权项

1. A driving method for a display device, wherein the display device comprises:
an electrophoretic fluid comprising a first type of particles, a second type of particles, a third type of particles and a fourth type of particles, all of which are dispersed in a solvent or solvent mixture, wherein the first and second types of particles are oppositely charged and the third and fourth types of particles are oppositely charged, and (ii) a plurality of pixels wherein each pixel is sandwiched between a common electrode and a pixel electrode; the method comprises the steps of:
a) applying no voltage to the pixel electrodes and applying a high voltage to the common electrode wherein the high voltage has a polarity opposite of the charge polarity of the second type of particles, to drive all pixels towards the color state of the second type of particles,b) applying no voltage to the pixel electrodes and applying a low voltage to the common electrode wherein the low voltage has a polarity opposite of the charge polarity of the third type of particles, to drive all pixels towards the color state of the third type of particles, andc) maintaining the common electrode grounded and applying different voltages to the pixel electrodes to drive pixels towards their desired color states.