Patent ID: 8040318

Claim:
An electrophoretic display panel for displaying a picture and subsequently displaying a subsequent picture comprising: a pixel having an electrophoretic medium comprising first and second charged particles, the first charged particles having a first optical property, the second charged particles having a second optical property different from the first optical property, the first and the second charged particles being able to occupy positions in a common region of the pixel, the common region comprising at least three substantially separate sub-regions; an optical state depending on the positions of the particles in the common region, and transition control means comprising: electrodes for receiving potentials, each one of the electrodes being associated with one of the sub-regions, and drive means being arranged to control the potentials to control the transition of at least a first number of the first particles and at least a second number of the second particles being in respective separate sub-regions of the common region for displaying the picture, to separate sub-regions of the common region for displaying the subsequent picture, wherein the transition control means are further arranged to control the first number of the first particles and the second number of the second particles to always be in separate sub-regions of the common region during the transition.