Projection screen using a bragg selective holographic element

Details Projection screen using a bragg selective holographic element Projection screen using a bragg selective holographic element

2008-06-20

2011-10-18

Mahoney, Christopher (Department: 2862)

Optical: systems and elements

Projection screen

C359S449000

Reexamination Certificate

active

08040601

ABSTRACT:
A front projection system comprises a display source and a front projection screen. A rear projection system comprises a display source and a rear projection screen. The display source generates illumination. The front or rear projection screen comprises a plurality of high aspect ratio structures are configured to act as a Bragg selective holographic element. The plurality of high aspect ratio structures are configured to diffract the illumination toward a viewer.

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Zhu et al., Polymeric multi-channel bandpass filters in phase-shifted Bragg waveguide gratings by direct electron beam writing, Dec. 2004, Optics Express vol. 12, No. 25, pp. 6372-6376.

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