An integral imaging display (or light field display) is composed of an image array and a convex lens array. The image and lens arrays are paired in a one-to-one corresponding relationship. The system provides different views depending on the viewer's location, by having each lens magnify a different portion of the corresponding image. There can be two strategies in building an integral imaging display. The first one places the image array at the focal plane of the lens array: the viewer sees one pixel through each lens depending on his/her location. The second strategy places the image array near but not at the focal plane of the lens array: the viewer sees multiple pixels through each lens. The second method has higher resolution, but it can have limited depth range.
An integral floating display was proposed to enhance the depth representation of integral imaging. The main cause of depth limitation is the visibility of seams between lenses in the lens array. By placing a large convex lens (floating lens) in front of the integral imaging system, one can form a 3D image with the seams invisible to the viewer.
I analyzed how the floating lens and lens array in an integral imaging system interact, and proposed a design scheme that makes the seams invisible while maximizing the viewing angle of the 3D image. To verify the design scheme and show its feasibility, my colleagues and I implemented a prototype of an integral floating display. The system was composed of 12 (6 horizontal x 2 vertical) spatial light modulators with a resolution of 1024 x 768, a 6 x 2 convex lens array, and a floating lens.
Collaborators: Keehoon Hong, Jae-Hyun Jung, Gilbae Park, James Lim, Youngmin Kim, Joonku Hahn, Sung-Wook Min, Byoungho Lee