Patent ID: 6100863
Filing Date: 2000-08-08
Classification: G09G

Abstract:
A method for determining a code set for use with a plasma panel display device which displays video images having 2.sup.N gray-scale values, where N is an integer, the determined code exhibiting less moving pixel distortion (MPD) than a binary code which represents the 2.sup.N -1 gray-scale values as N-bit values, the method comprising the steps of:defining M subfields where M is an integer greater than N;allocating sustain pulses among the M subfields such that each of the 2.sup.N -1 gray scale values can be represented by a combination of selected ones of the M subfilelds;defining 2.sup.M -1 code values as a sequence of M-bit binary values, each of the M bits corresponding to a respective one of the defined M subfields;determining a gray scale value for each of the 2.sup.M -1 defined code values and grouping the 2.sup.M -1 code values according to gray scale value into 2.sup.N 1 different groups;determining an apparent error value between each code in group j and each code in group j+1 of the 2.sup.N -1 groups, where j is an integer; anddetermining the code set from among the grouped codes using a dynamic programming method which minimizes the determined apparent error as an objective function, the code set including one code selected from each group, the code set exhibiting a combined apparent error which is less than the combined apparent error of any other code set.