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Apparatus for projecting colored images

  • US 5,398,081 A
  • Filed: 06/07/1993
  • Issued: 03/14/1995
  • Est. Priority Date: 06/07/1993
  • Status: Expired due to Fees
First Claim
Patent Images

1. An apparatus for projecting a colored image onto a screen, comprising:

  • light source means for generating white light;

    image cell means on which an image to be displayed may be formed, which image cell means imparts an image to be displayed to light reaching the image cell means from the light source means;

    color modulator means for modulating the color of the light reaching the image cell means from the light source means, the color modulator means being optically positioned between the image cell means and the light source means and comprising a dichroic cube for separating white light from the light source means into plural component colored light beams and light valve means for controlling which of the plural component light beams exits the color modulator means and reaches the image cell means;

    controller means for controlling the image formed on the image cell means and the color of the light exiting the color modulator means, the controller means synchronizing the formation of images on the image cell means and the modulation of light color by the color modulator means such that the color of the light reaching the image cell means at a particular time corresponds to the color of the image formed on the image cell means at that particular time; and

    projection lens for projecting imaged light from the image cell means onto a screen;

    wherein the light valve means comprises reflector means associated with each colored light beam, each reflector means being independently controllably reflective or non-reflective, to affect whether each respective component colored light beam is reflected or not by the reflector means and forms part of the exiting light beam, thereby determining the color of the light exiting the dichroic cube.

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