Patent ID: 7876305
Filing Date: 2011-01-25
Classification: G02F,G09G

Abstract:
1. An electrophoretic display comprising: at least one pixel comprising electrophoretic material, a first electrode and a second electrode, and an addressing circuit for addressing the at least one pixel by applying a drive pulse and shaking pulses between the first electrode and the second electrode: the drive pulse having a level in accordance with an optical state to be reached by the at least one pixel, and the shaking pulses having an energy content depending on an optical state of the at least one pixel being near or at limit optical states or at intermediate optical states of the at least one pixel, and wherein the shaking pulses comprise at least three pulses, wherein the addressing circuit is arranged for providing shaking pulses having a first energy content when the optical state of the at least one pixel is near or at limit optical states where the electrophoretic material is near the first electrode or the second electrode, and for providing shaking pulses having a second energy content when the optical state of the at least one pixel is at intermediate optical states where the electrophoretic material is away from the first electrode and the second electrode, the second energy content of the shaking pulses being lower that the first energy content to reduce movement of the electrophoretic material located away from the first electrode and the second electrode to reduce influencing the intermediate optical states of the at least one pixel so that both image retention and image update visibility due to the shaking pulses are reduced and disturbances caused by the shaking pulses having the first energy content and the second energy content on brightness of the at least one pixel in the limit optical states and the intermediate optical states are substantially equal.