Patent ID: 7077523

Claim:
A volumetric three-dimensional display device for displaying an object comprising: a) a display means for presenting two-dimensional images (first images), wherein the two-dimensional images are the image representatives of the cross section of the object at different positions along the third dimension,; and b) a Micromirror Array Lens receiving light from the display means and forming a three-dimensional image by imaging two-dimensional images (second images); wherein the Micromirror Array Lens is a Diffractive-Reflective Hybrid Fresnel Variable Focusing Lens, wherein the changing rate of the focal length is at least equal to the product of a number of cross-sectional images times persistence rate (afterimage speed) of average human eye so that the two-dimensional images with different imaging planes appear to fuse into a three-dimensional image of an object to a viewer, wherein the focal length of the Micromirror Array Lens is controlled to change imaging planes of the two-dimensional images along the third dimension.