|
|
Methodology
for a uniform illumination display
- Our
Approach
- One inherent problem of tiling several projectors is
the
variations between the projectors: these can be due to the light
sources, the optical components (filters, mirrors, ...) or the chip
inside each projector. As a result, the image produced is not uniform:
the edges between the tiles can be seen, and variations of colors
and/or intensity occur. (click here for an
example)
- The second problem is that people tend to build power
walls
that can accomodate about 10 people. Such setups take a lot of space.
Two features differentiate our display to the displays created by the
groups mentioned above.
- our display is aimed at the desktop
- we have solved the problem of illumination and
color
uniformity
- In addition:
- the display can be driven by either a high-end
graphics computer (SGi) or a cluster of PCs.
- the cost of such a display is about US$100,000
versus
more than US$1 million.
- Methodology
-
The following table lists our specifications and the
solution
implemented:
| Specifications |
Solution |
| Size: for desktop applications |
short throw lens fitted on each projector:
diagonal
of one tile is 21' (53.3 cm) |
| High resolution: 3 Mpixels minimum |
3 projectors (can be extended to 11.7 Mpixels
with
a 3 x 3 projectors array) |
| High density: > 77 dpi |
short throw lens fitted on each projector
tightly packed projector
Reducing the 21' diagonal of a tile will result in higher density |
| Uniform color and illumination |
one light source shared by all projectors |
| High image quality |
high-end projectors, Jenmar black screen |
| Good contrast |
Jenmar black screen |
- Schematic
Diagram
|
