Method and device for controlling a matrix screen displaying gray levels

Abstract From the Canadian patent

A process and device for controlling a matrix screen displaying gray levels, wherein during the line time T activation signals are delivered to the columns of the screen for a time depending on the gray level i of the image point in question and equal to (T/N).Nil, where O?i?m?N the Nils, forming a strictly increasing sequence of i of first term zero and of last term lower than or equal to N the Nils, being so selected as to obtain a predetermined distribution for the light intensities of the different gray levels. Appliation to the control of microdot or liquid crystal matrix screens.