Rear projection screen for high ambient light environments havin

Details Rear projection screen for high ambient light environments havin Rear projection screen for high ambient light environments havin

1994-06-17

1996-08-13

Pellman Gross, Anita

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 41, 359 49, 359 63, G02F 11335

Patent

active

055462022

ABSTRACT:
In a display system suitable for high ambient light environments, a lamp is used simply as a light source to illuminate a rear projection display screen, which is a matrix of tiny cells that modulate the light at video rates. Each cell includes a polymer dispersed liquid crystal (PDLC), a focusing lens and a pinhole aperture. When the PDLC is electrically activated, light passing through the PDLC is scattered in many directions, and very little light passes through the pinhole aperture and is seen by the viewer. When the PDLC is not electrically activated, light passing through the PDLC is not scattered, the lens of each cell focuses the light through the pinhole aperture, and the viewer sees a bright spot of light.

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