Patent ID: 6593904
Filing Date: 2003-07-15
Classification: G09F,G09G

Abstract:
An active matrix liquid crystal display, comprising:pixels formed by liquid crystal cells arranged in rows and columns of a matrix, a first side of the liquid crystal cells being connected to a reference potential; controllable switches, a control side of the controllable switches being connected row-by-row to row electrodes, a second side of the liquid crystal cells being connected column-by-column to column electrodes via a respective one of the controllable switches; a column control unit to generate gray-scale signals for the columns, the column electrodes being connected to the column control unit; a row control unit to generate turn-on signals for the controllable switches, the row electrodes being connected to the row control unit; a correction device that distorts the gray-scale signals reaching the liquid crystal cells based on information relating to a typical dependence between an optical transparence of the liquid crystal cells and a voltage applied so that an at least approximately linear relationship results between the optical transparence of the liquid crystal cells and undistorted gray-scale signals; and an adjustment device to variably adjust a potential difference between a.potential level of the gray-scale signals and the reference potential for at least one part of the columns, the gray-scale signals being distorted by the correction device as a function of the potential difference between the potential level of the gray-scale signals and the reference potential, the adjustment device for one of: i) changing a viewing angle range, and ii) adjusting optical contrast ratios within a specific viewing angle range; wherein the correction device is assigned to the row control unit and changes the turn-on signals for the controllable switches by controlling turn-on and turn-off times to distort the gray-scale signals transferred by the controlled switches to the liquid crystal cells.