A type of projector based on the DMD. Most DLP projectors use a single DMD, so to derive the three necessary colours they have a spinning wheel with colour philtre windows, carefully synchronised with the signal driving the DMD. High end DLP projectors use three DMD panels, avoiding the need for the spinning wheels. This is likely to remove the Rainbow Effect that afflicts many DLP projectors. The main advantages of DLP projectors over LCD-based ones is that the narrower band of electronics around each active pixel on the DMD's surface reduces the screen door effect, and they produce significantly darker blacks (or, more correctly, they are better at stopping light from coming out the lens when a pixel is supposed to be black).