23 May 2002 Volumetric three-dimensional display using projection CRT
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Volumetric 3D display systems have been expected to be able to reproduce natural view without eye fatigue. We have developed a prototype of the volumetric 3D monochromatic display system. It consists of a flat screen rotating at the speed of 1200 rpm(rotations per minute) and a synchronized projection engine. The projection engine can project 300 image slices per one rotation of the screen, so that we can see the continuous real three-dimensional image by residual images to human eyes. For this prototype, we use a 7 inch green projection CRT that is used in projection TVs as a two-dimensional image engine. In order to rapidly scan 3D display space, vector (random) scanning rather than normal raster scanning is used. We specially designed a lenticular type screen that has such a shape as to achieve constant gain over 180 degrees horizontal viewing angle. To collimate and redirect the light rays, Fresnel lenses and projection lens system are used, and to hide mirrors from viewer's viewing zone, off-axis optics are used. To obtain a stable volumetric three-dimensional image, the projected two-dimensional images and the positions of the screen should be synchronized. We devise a new algorithm that reconstructs the contour data of image slices from real three-dimensional shape. Vibration and noise is minimized. Brightness is not a problem and high enough resolution for relatively simple images can be achieved. A new version of full color and the higher resolution is on the way.
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Jang Doo Lee, Jang Doo Lee, Hyung Wook Jang, Hyung Wook Jang, Hui Nam, Hui Nam, Myoung Seop Song, Myoung Seop Song, Bum Sik Kim, Bum Sik Kim, Yoon Sik Oh, Yoon Sik Oh, } "Volumetric three-dimensional display using projection CRT", Proc. SPIE 4660, Stereoscopic Displays and Virtual Reality Systems IX, (23 May 2002); doi: 10.1117/12.468029; https://doi.org/10.1117/12.468029

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