Patent ID: 7352346
Filing Date: 2008-04-01
Classification: G02F,G09G

Abstract:
1. A method of electrically addressing a matrix screen of bistable nematic liquid crystals with breaking of anchoring, the method comprising applying controlled electrical signals respectively to row electrodes and to column electrodes of the screen, and further comprising simultaneously addressing a plurality of rows using similar row signals that are offset in time by a duration greater than or equal to the time column voltages, said row addressing signals comprising in a first period at least one voltage value serving to break the anchoring of all of the pixels in the row, followed by a second period enabling the final states of the pixels making up the address row to be determined, said final states being a function of the value of each of the electrical signals applied to the corresponding columns wherein the screen uses two textures, one texture being uniform or lightly twisted in which the molecules are at least substantially parallel to one another, and the other texture differing from the first by a twist of the order of ±180° and wherein in which relationship: τ τ τ