Patent ID: 7453435
Filing Date: 2008-11-18
Classification: B82Y,G02F,G09G

Abstract:
1. A method of controlling the grey state of pixels in an electrochromic matrix display comprising a first set of electrodes formed of electrically isolated conduction lines, a second set of electrodes formed of electrically isolated conduction lines, an electrochromic material arranged between or on said first and second sets of electrodes and a drive arranged to supply drive voltages selectively to individual electrodes in said first and second sets of electrodes, said first and second sets of electrodes being arranged in a pattern such that each electrode in said first set intersects each electrode in said second set at a single intersection and each electrode in said second set intersects each electrode in said first set at a single intersection, said intersections between the first and second sets of electrodes forming a set of pixels, wherein said method comprises the steps of: wherein the electric signal for a particular greyscale state on a particular data line is a function of the distribution of the greyscale states of the pixels along said particular data line; wherein one of two constant voltages U wherein only two possible greyscale states of the pixels exist; wherein U