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Display device using optical modulator equipped with lens system having improved numerical aperture

  • US 7,227,594 B2
  • Filed: 05/12/2006
  • Issued: 06/05/2007
  • Est. Priority Date: 05/12/2005
  • Status: Expired due to Fees
First Claim
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1. A display device using an optical modulator equipped with a lens system having an improved numerical aperture, comprising:

  • an illumination lens system for radiating light emitted from a light source;

    a diffractive optical modulator for generating diffracted light having a plurality of diffraction orders by modulating light incident from the illumination lens;

    a numerical aperture reducer for reducing a numeral aperture by causing positive order diffracted light and corresponding −

    1st order diffracted light of the diffracted light, which is generated by the diffractive optical modulator, to approach each other; and

    a projection system for condensing the diffracted light onto an object and performing scanning when the diffracted light having the reduced numerical aperture is emitted from the numerical aperture reducer.

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