Projection display

Details Projection display Projection display

2006-04-25

2009-08-11

Dowling, William C (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C359S494010

Reexamination Certificate

active

07572013

ABSTRACT:
A projection display uses reflective liquid crystal display elements for each color light to prevent ghost image. A λ/4 wave plate is disposed between a crossed dichroic prism assembly for color combination and the projection optical system to convert the state of polarization between linear polarization and circular polarization. Wavelength selective wave plates, each of which transmit the projected color light without varying its orientation of polarization but rotate the orientations of polarization of the other color lights 90 degrees, are disposed between the entrance face of the crossed dichroic prism assembly and each of a polarization beam splitter for blue light, a polarization beam splitter for green light, and a polarization beam splitter for red light.

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