Patent ID: 8704976

Claim:
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 ( 58 ) in the flow direction, of a pixel (P) whose switching must be controlled by the electrical control signal, auxiliary electrical signals whose amplitude is less than the anchorage breaking voltage and whose rising or falling edges are temporally placed in advance or in coincidence in relation to the active falling edge of the electrical control signal, so as to favour the switching of the said pixel to be controlled (P), said auxiliary electrical signals applied to at least one neighbouring pixel ( 58 ), being designed to induce in the said neighbouring pixel, an auxiliary flow parallel to said direction, allowing to control the switching of the pixel to be controlled (P) without switching said 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.