Patent ID: 6014128
Filing Date: 2000-01-11
Classification: G09G,H04N

Abstract:
An interframe method of evaluating a bit sequence pattern for a pulse width modulated display of image data, which is formatted into on or off values of display elements of a display device during a frame period, each sequence providing a light intensity, comprising the steps of:specifying a first light function, representing on or off values of one display element of said display elements during a first series of time intervals that comprise a first one of said frame periods;specifying a second light function, representing on or off values of said one display element during a second series of time intervals that comprise a next one of said frame periods;subtracting said second light function from said first light function, thereby providing a light difference function;calculating an intensity difference value, representing the difference between a light intensity resulting from said first light function and a light intensity resulting from said second light function;summing values of said light difference function, thereby providing a light difference series function; andderiving mathematically, from said light difference series function, a value representing an optical characteristic of said pattern, wherein said deriving step comprises subtracting one-half said intensity difference value from each value of said difference function, summing the results of said subtracting step, and dividing the result of said summing step by the number of said time intervals in one of said frame periods, thereby obtaining a symmetry series function.