Patent ID: 8817068

Claim:
A digital hologram image display device comprising: a spatial light modulator configured to receive a holography interference pattern and represent the holography interference pattern; a light source positioned at one side of the spatial light modulator and configured to generate a reference beam, wherein the light source includes a laser diode and a collimated LED positioned at one side of the digital hologram image display device; an optical device configured to control the reference beam generated from the light source to collimate the reference beam onto an entire surface of the spatial light modulator to generate a 3D (3-Dimensional) image corresponding to the holography interference pattern, wherein the optical device includes an expander configured to enlarge a cross-sectional area of the reference beam, and a lens system configured to control the enlarged cross-sectional area of the reference beam to correspond to the entire surface of the spatial light modulator; and a diffusion sheet configured to selectively and effectively lower an intensity of a 0 th diffraction component of the reference beam used to generate the 3D image, wherein the diffusion sheet is disposed between the light source and the expander.