Patent ID: 7224375

Claim:
Method for noise reduction in a pulse-width-controlled image-display device, wherein the time interval available for representing the image is divided into sequential weighted partial time intervals, which form a signal data stream, and wherein the brightness signals present in the form of multibit words belonging to the image points of the image to be represented, are produced by changing to activation sequences assigned to the partial time intervals, the method further comprising: a) in a first step, the brightness of several sequential image points is examined to determine if said brightness is greater than a predetermined brightness threshold value, b) in a second step then, when the brightness values of several sequential image points are all smaller than the predetermined brightness threshold value, a mean value of the brightness value is formed from these brightness values for the several sequential image points and this mean value is used in the signal data stream and then, when the brightness values of several sequential image points are not all smaller than the predetermined brightness threshold value, the corresponding multibit word is introduced in unchanged form to conversion in activation sequences; and c) the first and second step is performed for each sequential image point; and d) wherein the number of image points to be checked in the first step is at least three.