Holographic 3-D display viewable from all horizontal directions by using a single high-speed SLM

Holographic display is considered to be one of the most ideal three-dimensional display modalities. However, there are still some crucial problems to be resolved. The narrow viewing zone angle and the smallness of reconstructed images are one of them. There is a trade-off relation between the viewing zone angle and the size of the reconstructed image. The only way to improve both two properties is to increase the pixel number of a spatial light modulator (SLM). A technical method to equivalently increase such a pixel number based on the time division method was proposed by Takaki and Okada. In this method, by using a high-speed SLM such as a digital micromirror device (DMD), horizontal viewing zone angle was considerably enlarged. However, full motion parallax could not be realized although binocular parallax was achieved. To address this problem, this paper presents a method which enables such a full motion parallax, namely, look-around property from all horizontal directions.