Patent ID: 8717280

Claim:
An electrophoretic display device comprising: an electrophoretic pixel to be updated within a pixel update period from an initial pixel state to an update pixel state; a first part of a memory device storing a lookup table for storing voltage waveforms corresponding to pixel updates between pixel states; a voltage driver for supplying at least one of the voltage waveforms of the lookup table across the pixel; an image controller controlling the voltage driver and comprising a second part of the memory device, the image controller arranged for receiving the update pixel state and storing said initial and update pixel state in the second part of the memory device; wherein the image controller is programmed to execute, in a consecutive drive phase, during the pixel update period, repeatedly the steps of: retrieving the initial pixel state and update pixel state from the second part of the memory device, matching, when the initial and update pixel states are different, from the set of waveforms in the lookup table, a consecutive wave form and a corresponding consecutive pixel state, according to a path defined by the consecutive drive phase, from the initial pixel state to the update pixel state, wherein the transition between the initial pixel state and the consecutive pixel state is within a consecutive update period when the consecutive pixel state is not adjacent to the initial pixel state, storing the consecutive pixel state in the second part of the memory device as a new initial pixel state; and controlling the voltage driver to drive the pixel from the initial pixel state to the consecutive pixel state by supplying said consecutive waveform to the pixel during a consecutive update period so as to provide a consecutive update period smaller than the pixel update period, wherein the image controller is programmed to execute, in a single update drive phase differing from the consecutive drive phase, during the pixel update period, the steps of: retrieving the initial pixel state and update pixel state from the second part of the memory device, retrieving a single pixel update waveform from the lookup table, matching a transition from the initial pixel state to the update pixel state, and controlling the voltage driver to drive the pixel from the initial pixel state to the update pixel state using said single waveform; and wherein the image controller is switchable between the single update drive phase and the consecutive drive phase.