Patent ID: 6693613
Filing Date: 2004-02-17
Classification: A61M,G09G

Abstract:
A system for asymmetrically actuating a liquid crystal display (LCD), said system comprising:a transparent cover; a cover electrode, positioned adjacent to the cover; a liquid crystal layer, positioned parallel to the cover; a matrix of pixel electrodes arranged in a plurality of columns and a plurality of rows, wherein an intersection of a row and a column defines a location of a pixel electrode and a pixel in said matrix, the pixel electrodes positioned on the opposite side of the liquid crystal layer from the cover electrode; a control circuit including at least one input adapted for receiving digital video information, the digital video information specifying pixel states, the control circuit generating at least first and second actuation voltages corresponding to a pixel state of a pixel from the digital video information; wherein a first absolute difference between a first cover voltage and the first actuation voltage is different from a second absolute difference between a second cover voltage and the second actuation voltage, the first cover voltage is applied to the cover electrode while the first actuation voltage is applied to one of the pixel electrodes for a first duration, the second cover voltage is then applied to the cover electrode while the second actuation voltage is applied to the same pixel electrode for a second duration; and the ratio of the first duration to the second duration counterbalances the ratio of the first absolute difference to the second absolute difference; wherein the control circuit includes a first circuit that converts the digital video information into calibrated digital video information.