Optical relay lens system for projection displays
First Claim
1. Apparatus for projecting onto a screen a first image at a first wavelength, a second image at a second wavelength, and a third image at a third wavelength, comprising:
- means, including a 1×
relay lens, a color splitting prism assembly positioned on a first side of said 1×
relay lens, and a polarizing prism assembly positioned on a second side of said 1×
relay lens, for combining said first image, said second image and said third image to form a substantially superposed relayed image; and
means for projecting an image of said substantially superposed relayed image onto a screen.
1 Assignment
0 Petitions
Accused Products
Abstract
A projection display which includes reflective light valves such as liquid crystal spatial light modulators, and a 1× optical relay lens system. The 1× optical relay lens system eliminates the requirement for a projection lens having a large retrofocus distance. Projection displays based upon reflective liquid crystal light valves (spatial light modulators) require dichroic beam splitters necessary for color separation and a polarizing beam splitter necessary for light valve operation positioned between the light valves and the projection lens. The 1× optical relay lens produces a relayed intermediate image of the light valves, and incorporates therein the dichroic beam splitters and the polarizing beam splitter. The 1× optical relay lens produces an intermediate image which is projected by the projection lens at a given magnification with minimal working distance, which results in relatively less residual lateral color and an inexpensive projection lens.
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Citations
5 Claims
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1. Apparatus for projecting onto a screen a first image at a first wavelength, a second image at a second wavelength, and a third image at a third wavelength, comprising:
-
means, including a 1×
relay lens, a color splitting prism assembly positioned on a first side of said 1×
relay lens, and a polarizing prism assembly positioned on a second side of said 1×
relay lens, for combining said first image, said second image and said third image to form a substantially superposed relayed image; andmeans for projecting an image of said substantially superposed relayed image onto a screen. - View Dependent Claims (2, 3, 4, 5)
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Specification