Two-stage projector architecture
View Patent ↗A light projection system projects an image comprising a matrix of light pixels having modulated luminance. The projection system includes a first imager configured to modulate a light band on a pixel-by-pixel basis proportional to gray scale values provided for each pixel of the image to provide a first output matrix. A second imager is positioned and configured to receive the first output matrix of modulated pixels of light and modulate the individual modulated pixels of light from said first imager on a pixel-by-pixel basis proportional to a second gray scale value provided for each pixel of the image.
1. A two-stage projection system comprising:
a first stage having one or more imagers for modulating light on a pixel-by-pixel basis;
a second stage having one or more imagers for modulating light on a pixel-by-pixel basis;
a relay lens system projecting the output of the pixels of the first stage imagers onto corresponding pixels of the second stage imagers; and
a half-wave plate disposed between the first stage and the second stage.
2. The two-stage imager of claim 1 wherein the first stage comprises three imagers for modulating red, blue, and green light, respectively and an architecture configured to direct light of the desired color to each imager.
3. The two-stage imager of claim 2 wherein the second stage comprises three imagers for modulating red, blue, and green light, respectively and an architecture configured to direct light of the desired color to each imager.
4. The two-stage imager of claim 1 wherein the half-wave plate is disposed at the system stop of the relay lens system.
5. The two-stage imager of claim 1 wherein the relay lens system ensquares at least about 50 percent of the energy from a particular pixel of a first stage imager onto the corresponding pixel of a second stage imager.
6. The two-stage imager of claim 1 wherein the relay lens system provides a distortion due to field curvature of less than about 0.5 percent.