AN ELECTROPHORETIC DISPLAY AND A METHOD OF DRIVING AN ELECTROPHORETIC DISPLAY

摘要

An electrophoretic display comprises a plurality of pixels (18) with an electrophoretic material (8, 9) which comprises charged particles. A first electrode (6) and second electrode (5, 5') associated with each one of the pixels (18) presents a drive voltage waveform (VD) across each one of the pixels (18). The charged particles are able to occupy, between the first electrode (6) and the second electrode (5), two limit positions and intermediate positions between the two limit positions which are defined by the drive voltage (VD). An addressing circuit (16, 10)generates the drive voltage waveform (VD) by successively applying between the first electrode (6) and the second electrode (5) during an image update period (IUP): (i) a reset pulse (RE) enabling said particles to substantially occupy one of the extreme positions, and (ii) a drive pulse (Vdr) having a level in accordance with an optical state to be reached by the associated one of the pixels (18). The addressing circuit (16, 10) further generates a first shaking pulse (SP1) comprising at least one preset pulse having an energy sufficient to release particles present in one of the extreme positions, but insufficient to enable said particles to reach the other one of the extreme positions. The first shaking pulse (SP1) occurs during a same first shaking time period (TS1) during each image update periods (IUP), independent on the optical state a pixel (18) should reach. The first shaking time period (TS1) precedes the reset pulse (RE) or occurs in-between the reset pulse (RE) and the drive pulse (Vdr).