Patent attributes
An aspect of the invention provides a method of recording an image, comprising: providing a display cell having a first cell wall and a second cell wall opposed to the first cell wall, the cell walls enclosing a layer of a display medium comprising a liquid crystal material having finely-divided pigment particles dispersed therein, each cell wall including an electrode for applying an electric field across the display medium; applying via the electrodes a first electric field of a first polarity and of sufficient magnitude and duration to cause the particles to migrate and accumulate at the first cell wall; illuminating at least some of the particles with an image to be recorded; and applying via the electrodes a second electric field of opposite polarity to the first polarity and of sufficient magnitude and duration to cause some but not all particles to migrate from the first cell wall so as to produce a recorded image.
