Rear projection screen with reduced speckle
First Claim
1. A Rear projection screen comprising a front surface, a rear surface and first diffusion means for diffusing light into an audience space, characterized in that the screen comprises second diffusion means located behind the first diffusion means and a non-diffusion region between the first and the second diffusion means, wherein the second diffusion means comprises a bulk diffusion region, said bulk diffusion region and non-diffusion region being configured to reduce speckle without substantially reducing resolution.
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Abstract
A rear projection screen which includes a front lenticular surface, a diffusion region behind the lenticular surface, a non-diffusion region behind the diffusion region, and a rear phase grating surface, when used with high magnification projection systems, exhibits reduced speckle when compared to other rear projection screen without such a grating.
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Citations
23 Claims
- 1. A Rear projection screen comprising a front surface, a rear surface and first diffusion means for diffusing light into an audience space, characterized in that the screen comprises second diffusion means located behind the first diffusion means and a non-diffusion region between the first and the second diffusion means, wherein the second diffusion means comprises a bulk diffusion region, said bulk diffusion region and non-diffusion region being configured to reduce speckle without substantially reducing resolution.
- 4. A rear projection screen comprising a front surface, a rear surface and diffusion means for diffusing light into an audience space, characterized in that the rear surface comprises a phase grating and that the screen comprises a non-diffusing region between the diffusion means and the phase grating.
Specification