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HoloTV – 3rd generation in constructionThe main goal for the 3rd generation
HoloTV prototype is to design and building a system using 3 Digital
Micro-mirror
Devices (DMD) and 3 different
colored lasers. The 3 DMDs will be aligned in a sparse hologram array – that
is, there will be gaps in the hologram. Since each point on the hologram
contains information about all parts of the projected image that is in
the point’s line of sight, the full projected 3d image will still
reconstruct in the display unit. The disadvantage is that some of the
areas in the 3d image will have a different hue as one looks around the
image. The advantage is that the look-around angle will be greatly increased
for the 3d image. The use of 3 colors provides the capability for full
color projected 3d images. The other major technology section is the
volumetric display. The 3rd generation volumetric display consists of
30 layers of LC plates which are each 18” by 12” by 1/8”.
The layers of LC plates are stack to give a total display volume of 1.5’ by
1’ by 1’. The sequencing of the layers is the same as in
the 2nd generation display. Engineering challenges include converting
high intensity laser beams into spherical waves within the physical limits
of the enclosure, magnifying the projected 3d image to fill the display,
and aligning the 3 different optical paths such that the 3 color images
perfectly overlay in 3 dimensions to make the images to shape and in
proper color.
First color layout of the projection
enclossure: a) DLP section with one DLP in place, b.) laser pad with
blue laser mounted, c.) laser collimating
optics, d.) convex magnifying mirror, e.) path-length mirror, f.) back
of volumetric display.
B. Munjuluri, M. L. Huebschman, J. Hunt, H.R. Garner, “Rapid hologram updates for real-time volumetric information displays”, Appl. Optics., 44, 5076-5085, (2005). Michael Huebschman, Bala Munjuluri,
Jeremy Hunt and Harold Garner, “Holographic
Video Display Using Digital Micromirrors”, Conference: Practical
Holography XIX: Materials and Applications Symposium, SPIE Proc. 5742,
January (2005). Invited Paper. |
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3rd Geneneration HoloTV Prototype under Development: a.) laser-DLP
projection enclosure, b.) LC plate volumetric display, c.) display
power supplies, d.) laser and DLP power supplies. 