Patent ID: 7872633

Claim:
An electrophoretic display comprising: a plurality of pixels having an electrophoretic material comprising charged particles being at least able to occupy, between a first electrode and a second electrode of the pixels, one of two limit positions, and an addressing circuit for generating a drive voltage waveform to the pixels for determining an optical state of the pixels by applying, between the first electrode and the second electrode, during each image update period: (i) a reset pulse for driving said particles to substantially occupy one of the limit positions, and (ii) a drive pulse having an energy in accordance with an optical state to be reached by the associated one of the pixels, wherein the addressing circuit is arranged for further applying a first shaking pulse during a first shaking time period of each image update period that occurs at a first time and for a first duration for each image update period, the occurrence of the first shaking time period being independent of the optical state to be reached by the associated one of the pixels, the first shaking period preceding the drive pulse, the first shaking pulse comprising at least one preset pulse, with each preset pulse having an energy sufficient to release particles present in one of the limit positions but insufficient to enable said particles to reach the other one of the limit positions, wherein each of the reset pulse, the drive pulse and the first shaking pulse occur during different ones of the number of time periods and if the reset pulse has a duration shorter than a maximum duration, the addressing circuit is arranged for generating a third shaking pulse during at least part of a third shaking period occurring in-between the first shaking pulse and the reset pulse.