Patent ID: 7495651

Claim:
An electrophoretic display panel for displaying pictures, comprising: an electrophoretic medium comprising charged particles in a fluid; a plurality of picture elements ; a first and a second electrode associated with each picture element for receiving a potential difference; and drive means, the charged particles being able to occupy a position being one of a number of positions between the electrodes, and the drive means being arranged for controlling the potential difference of each picture element to be a picture potential difference having a picture value and an associated picture duration representing a picture energy for enabling the particles to occupy one of the positions for displaying one of the pictures, subsequently to be an inter-picture potential difference having an inter-picture value and an associated inter-picture duration representing an inter-picture energy and subsequently to be a subsequent picture potential difference for enabling the particles to occupy one of the positions for displaying a subsequent one of the pictures, characterized in that the drive means are arranged for controlling for each picture element the inter-picture value to have a sign opposite to a sign of the picture value and the inter-picture energy to be insufficient to substantially change the position of the particles and chosen in a range from larger than zero to substantially equal to the picture energy for reducing an undesired charge accumulation in the picture element.