the present invention is related to a gray - scale data bit processing method applied in a driving integrated circuit device of light - emitting diode , and more particularly to a separating and recombining method applied to reduce the bit numbers of data to be processed to indicate the brightness of light - emitting diode , and thus a set of weight values and more updating rates are generated to obtain an identical sum of gray - scale weight values compared to the original one processed at a higher bit numbers of data operation .