Patent ID: 8704976
Filing Date: 2014-04-22
Classification: G02F,G09G

Abstract:
1. A method for the control of a bistable nematic liquid crystal display having two stable textures, one of which is uniform or slightly twisted in which the molecules are substantially parallel to each other, and the other that differs from the first texture by about +/−180°, which includes a matrix of pixels arranged in crossed lines and columns, and in which a switching of state of the liquid crystal molecules, controlled by application of an electrical control signal between two electrodes ( 50 , 52 ) framing each pixel, generates a flow in a particular direction ( 18 ) close to the brushing direction, wherein, to control the switching of at least some of the pixels (P), the method includes a step of applying to at least one neighbouring pixel ( said auxiliary electrical signals applied to at least one neighbouring pixel ( to favor switching of a pixel (P) to a uniform or slightly twisted state (U), the rising edge of the auxiliary electrical signal is placed temporally in advance in relation to the active falling edge of the electrical control signal, to favor switching of a pixel (P) to a twisted state (T), the falling edge of the auxiliary electrical signals is place temporally in coincidence or in advance in relation to the active falling edge of the electrical control signal.