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Projector optimized for modulator diffraction effects

  • US 9,915,820 B2
  • Filed: 03/15/2013
  • Issued: 03/13/2018
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. An optical system for modulating an incident light beam, the optical system comprising:

  • an illumination source for providing the incident light beam having a defined narrow spectral bandwidth that is 10 nm or less;

    an optical element having an aperture of a size and a shape for transmitting portions of a modulated light beam and blocking remaining portions of the modulated light beam; and

    a micro-mirror array optical modulator for selectively modulating the incident light beam to encode data thereon based on commands to an ON-state or an OFF-state of one or more micro-mirrors to form the modulated light beam, the micro-mirror array optical modulator being selected from a plurality of micro-mirror array optical modulators by being matched to the size and shape of the aperture in that the modulated light beam has an ON-state light efficiency and an OFF-state contrast that depend on a diffraction handedness pattern of the modulated light beam relative to the size and the shape of the aperture, wherein the optical system is configured to have an f-number in a range of F/3.5 to F/6.

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