Patent ID: 7787174

Claim:
A method for creating a microlithographic pattern with improved gray-scale properties on a workpiece sensitive to radiation using a spatial light modulator (SLM) having a plurality of modulating elements, said modulating elements having the capability of modulating to a number of modulation states larger than two, including: reading from an information storage device, a pattern description that describes the geometry of a binary pattern; extracting from the pattern description a sequence of partial patterns; converting said partial patterns to modulator signals, wherein said converting of the partial patterns includes converting the binary pattern into a pixel bit map with a plurality of available gray-scale levels per pixel and from which the modulator signals are derived; operating at least some of the modulating elements so that the modulating elements are driven to phases, wherein the modulating elements are set to a number of modulation states larger than two, and wherein the modulator elements are individually driven by the modulator signals derived from the pixel bit map; emitting electromagnetic radiation in the wavelength range from extreme ultraviolet (EUV) to infrared (IR); illuminating by said radiation the spatial light modulator; projecting the illumination from the spatial light modulator onto the workpiece forming a partial image; and moving said workpiece and/or projection system relative to each other while coordinating said relative movement and the operation of the modulating elements so that said pattern is stitched together from the partial images created by the sequence of partial patterns.