Patent ID: 8531389

Claim:
An electrophoretic display panel that is drivable between extreme positions and states between said extreme positions, the electrophoretic display panel comprising: an electrophoretic medium comprising charged particles; a plurality of picture elements having electrodes associated with each picture element for receiving a potential difference; and drive means comprising at least a processor, the drive means being configured to provide a driving waveform to drive at least one of the picture elements from a first gray scale to an intended gray scale, the driving waveform comprising, in sequence: a first sequence of preset potential differences having first preset values and associated first preset durations, the first preset values in the first sequence alternating in sign, each first preset potential difference representing a preset energy sufficient to release particles present in a first one of said extreme positions from their position but insufficient to enable said particles to reach a second one of the extreme positions; a reset potential difference to drive the particles to occupy an extreme position which is determined based on which extreme position is closest to a position of the particles which corresponds to the intended gray scale, wherein a sign of the reset potential difference is opposite to a sign of the last preset potential difference in the first sequence; a second sequence of preset potential differences having second preset values and associated second preset durations, the second preset values in the second sequence alternating in sign, each second preset potential difference representing a preset energy sufficient to release particles present in the extreme position driven by the reset potential difference but insufficient to enable the particles to reach the other one of the extreme positions, wherein a sign of the first preset potential difference in the second sequence is opposite to the sign of the reset potential difference; and two or more driving pulses for driving the particles to a position corresponding to the intended grey scale, the driving pulses being separated by at least one non-zero time interval.