Patent ID: 7362294
Filing Date: 2008-04-22
Classification: G09G

Abstract:
1. A method for displaying gray shade images in a liquid crystal display, said display comprising an array of elongated row electrodes and an array of elongated column electrodes arranged transverse to the row electrodes, wherein overlapping areas of the two arrays of electrodes define pixels of the display when viewed in a viewing direction, comprising: applying electrical potentials to the two arrays of electrodes to display different repetitive frames or fields, wherein an image is displayed by addressing the row and column electrodes during sequential row addressing time periods, and wherein during each of the row addressing time periods, a substantially constant row selection potential is applied to at least a selected one of the row electrodes for displaying an image at a line of pixels overlapping the at least one selected row electrode, each frame being the total number of lines in a displayed image of the display, and each field being a collection of lines displayed consecutively in the displayed image, wherein the collection of lines is a subset of and contains fewer than the lines that form the displayed image, at least one of said repetitive frames or fields having at least two different corresponding row electrode addressing periods for at least two corresponding sets of lines within such frame or field, thereby causing display of desired images, wherein, for displaying at least one of a number of different gray shades in the desired images, the electrical potentials are applied so that the at least two corresponding row electrode addressing periods of the at least two corresponding sets of lines of the at least one repetitive frame or field displayed are of different non-zero lengths of time.