Eclipse projection

Lenny Lipton; Bruce Dorwoth

doi:10.1117/12.430802

22 June 2001 Eclipse projection

Lenny Lipton, Bruce Dorwoth

Proceedings Volume 4297, Stereoscopic Displays and Virtual Reality Systems VIII; (2001) https://doi.org/10.1117/12.430802
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

We have used the eclipse method for a pair of liquid crystal (LC) projectors so they produce a stereoscopic image, with very little cross-talk, by taking advantage of the fact that liquid crystal projectors have long image lag. We operate an eclipse system whose rate is independent of the field rate of the projectors since the liquid crystal image is sustained more or less continuously. In this way we are turning a problem associated with these projectors into the method for projecting good stereoscopic images. We use a pair of LC shutters at the projector lenses opening and closing out of phase with each other, eclipsing the images at a high enough rate to preclude flicker. The selection device eyewear uses left and right LC shutters that run in synchrony with the projector shutters. A stereoscopic images is viewed the right image is seen by the right eye when the right shutters for both projector and eyewear are open. The left eye image is blocked by both eyewear and projector shutters, and so on, vice versa, field after field. The fields have been, in effect, created by the projector shutters and are unrelated to the actual video field rate. An important aspect of this approach is that the resultant stereo image has very low cross-talk because the process is dependent upon the dynamic range of the LC shutters and eliminates any contribution of cross-talk from pixel hysteresis.

Citation Download Citation

Lenny Lipton and Bruce Dorwoth "Eclipse projection", Proc. SPIE 4297, Stereoscopic Displays and Virtual Reality Systems VIII, (22 June 2001); https://doi.org/10.1117/12.430802

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KEYWORDS

Camera shutters

Projection systems

Liquid crystals

Eyewear

Video

Image quality

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