Holographic displays employing digital micromirror devices (DMDs) reconstruct 3D images at high diffraction orders. For LED displays, this geometry introduces large dispersion at the DMD surface, reducing image resolution and depth. This work proposes a color DMD LED holographic display with dispersion compensation utilizing an additional diffraction grating in an illumination module. The solution allows to obtain image depth up to 100 mm, which is comparable to the one achieved by a liquid crystal spatial light modulator, where the limiting factor is spatial coherence of the source. Experimental comparison of the results obtained with the laser and LED source gives evidence of effective speckle noise reduction, even from a single frame. (C) 2019 Optical Society of America
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