IMAGE DISPLAY

Compact tiled display with uniform illumination

[+] Author Affiliations
N. Bordes, B. Pailthorpe

University of Sydney, VisLab, A28, New South Wales 2006, Australia

W. P. Bleha

JVC, 2310 Camino Vida Roble, Carlsbad, California 92009

J. Electron. Imaging. 12(4), 682-688 (Oct 01, 2003). doi:10.1117/1.1607965
History: Received Jan. 30, 2002; Revised Mar. 7, 2003; Accepted Apr. 4, 2003; Online October 22, 2003
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The demand for more pixels is beginning to be met as manufacturers increase the native resolution of projector chips. Tiling several projectors still offers a solution to augment the pixel capacity of a display. However, problems of color and illumination uniformity across projectors need to be addressed as well as the computer software required to drive such devices. We present the results obtained on a desktop-size tiled projector array of three D-ILA projectors sharing a common illumination source. A short throw lens (0.8:1) on each projector yields a 21-in. diagonal for each image tile; the composite image on a 3×1 array is 3840×1024 pixels with a resolution of about 80 dpi. The system preserves desktop resolution, is compact, and can fit in a normal room or laboratory. The projectors are mounted on precision six-axis positioners, which allow pixel level alignment. A fiber optic beamsplitting system and a single set of red, green, and blue dichroic filters are the key to color and illumination uniformity. The D-ILA chips inside each projector can be adjusted separately to set or change characteristics such as contrast, brightness, or gamma curves. The projectors were then matched carefully: photometric variations were corrected, leading to a seamless image. Photometric measurements were performed to characterize the display and are reported here. This system is driven by a small PC cluster fitted with graphics cards and running Linux. It can be scaled to accommodate an array of 2×3 or 3×3 projectors, thus increasing the number of pixels of the final image. Finally, we present current uses of the display in fields such as astrophysics and archaeology (remote sensing). © 2003 SPIE and IS&T.

© 2003 SPIE and IS&T

Citation

N. Bordes ; B. Pailthorpe and W. P. Bleha
"Compact tiled display with uniform illumination", J. Electron. Imaging. 12(4), 682-688 (Oct 01, 2003). ; http://dx.doi.org/10.1117/1.1607965


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