the invention proposes a subpixel scroll method , which optically shifts the position of the mirror elements to the projection axis by one subpixel size each , with an additional 45 ° mirror between dmd and projection optics . the 45 ° mirror is shifted by ¼ mirror element width by means of a controllable actuator . the size of this change of position and the time are synchronized in such a way by the position indicator signals of the scan sled that the mirror element seems to stand relative to the substrate surface element . this resetting is however not bound to the dmd - switching speed of 10 khz . among other advantages , the invention reduces the blur at the edge transition by the higher resolution and facilitates a higher scan velocity , whereby the scan velocity depends on the dynamics of the actuator , the effective uv - power of the uv - source and the sensitivity of the photosensitive polymer .