Researchers from Seoul National University
have developed a three-dimensional color display that uses a set of six
holograms and is made from relatively compact and inexpensive components.
The three-dimensional displays could eventually be used to display
any type of dynamic data for use in entertainment, art, medicine, and
The autostereoscopic system consists of red, green and blue laser
diodes, a liquid-crystal spatial light modulator and a projection lens,
and is 60 centimeters long. It generates slightly different images for
the left and right eyes to produce the effect of natural three-dimensional
Rather than three-dimensional holograms, which are difficult to
calculate, the system produces two-dimensional red, green and blue holograms
for each eye. These holograms are reproduced by shining a laser through
a liquid-crystal display that shows the holograms' light and dark patterns.
The researchers' system shines red, green and blue lasers through
a single liquid crystal light modulator, which switches rapidly among
the six hologram patterns. The three color holograms for each eye overlap
to produce a full-color image. The output is focused through a lens to
direct the two images to the left and right eyes.
The system is relatively cheap, efficient, and color fidelity
can be controlled without color filters, according to the researchers.
With a parallel processing computer system and a specialized chip,
the method could be used for real-time three-dimensional broadcasting,
according to the researchers.
Like most autostereoscopic displays, the researchers' system requires
users to view images from a specific distance and at a particular angle.
The method to be used practically in three to five years, according
to the researchers. The work appeared in the October 18, 2004 issue of
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