Moving particle display device with intermediate drive electrode

摘要

A display device and a method for driving the display device is disclosed. The display device comprises drive circuitry (35) and a plurality of pixels (PIX1, PIX2, PIX3, PIX4, PIX5, PIX6) having movable charged particles (116). The drive circuitry is configured to apply control signals to the pixels to move the charged particles between first (110) and second (112) regions of each pixel in order to alter the optical appearance of each pixel. The method for each pixel comprises a pre-addressing stage (PRA) of moving the charged particles towards the boundary (114) between the first and second regions, and then an addressing stage (ADD) of moving the particles to one side or the other side of the boundary, in dependence on the desired optical appearance of the pixel.

主权项

1. A drive method for a display device, the display device comprising a plurality of pixels, each pixel comprising:
a first drive electrode that is associated with a first region of the pixel; a viewing electrode that is associated with a second region of the pixel; a second drive electrode that is: intermediate of the first drive electrode and the viewing electrode; at the boundary between the first and second regions of the pixel; and movable charged particles; and wherein the optical appearance of each pixel is altered by controlling the number of charged particles within the vicinity of the viewing electrode, under the influence of control signals applied to the first and second drive electrodes and the viewing electrode, wherein the method for each pixel comprises: in a pre-addressing stage, applying control signals to the pixel to move the particles towards the second drive electrode at the boundary between the first and second regions; and then in an addressing stage, applying control signals to the pixel to move the particles to the first region and to the second region, the respective numbers of particles moved to the first and second regions being in dependence on the desired optical appearance of the pixel; in a post-addressing stage, subsequent to the addressing stage, applying control signals to the pixel such that the particles in the first region move to the vicinity of the first drive electrode and that the particles in the second region move to the vicinity of the viewing electrode; wherein controls signals for the pre-addressing stage are applied to at least one of the plurality of pixels and controls signals for the addressing stage are applied to at least one other of the plurality of pixels, and wherein the control signals for the pre-addressing stage and the control signals for the addressing stage are applied simultaneously.