Communications of the ACM
A New Approach to 3D Holographic Displays Greatly Improves the Image Quality
The optical set-up consists of a deformable mirror and the scattering medium with two successive holographic diffusers. A high-numerical-aperture imaging unit mounted on a three-axis motorized translational system is utilized for wavefront optimization an
Credit: KAIST
Researchers at the Korea Advanced Institute of Science and Technology (KAIST) led by professor YongKeun Park say they have developed a three-dimensional (3D) holographic display whose performance tops that of existing displays by a factor of about 2,600.
The researchers say their breakthrough should enhance the limited size and viewing angle of 3D images.
The KAIST team used a deformable mirror (DM) in conjunction with two successive holographic diffusers to scatter light in many directions. The results included a wider viewing angle and larger image, along with volume speckle fields caused by the interference of multiple scattered light. The researchers corrected this problem by using a wavefront-shaping method to control the fields. The end-product was an enhanced 3D holographic image with a viewing angle of 35 degrees in a volume of 2 centimeters in length, width, and height.
The researchers say the display's performance was more than 2,600 times stronger than the original image definition produced with a DM without a diffuser.
"Scattering light has previously been believed to interfere with the recognition of objects, but we have demonstrated that current 3D displays can be improved significantly with an increased viewing angle and image size by properly controlling the scattered light," Park says.
From KAIST
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