The present invention generates coded data having always high image quality irrespective of the change amount of a picture. The invention also relates to an image-generating unit for a head-up display provided with an inventive light source. The method further includes patterning the etch stop layer using the grooves to form holes respectively corresponding to the conductive pillars, and filling a metal into the grooves and the holes. The cable also includes an EMI absorbine layer. The holding means has a sledge element, and the track and the sledge element are slidably connected such that the sledge element may move along said track.