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Multi-chip LED color mixing by diffraction

  • US 6,604,839 B2
  • Filed: 06/15/2001
  • Issued: 08/12/2003
  • Est. Priority Date: 06/15/2001
  • Status: Expired due to Term
First Claim
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1. A light emitting device comprising:

  • a diffractive optical element;

    a first light emitting diode emitting first light having a first range of wavelengths, said first light directed onto said diffractive optical element at a first range of angles of incidence; and

    a second light emitting diode emitting second light having a second range of wavelengths, said second light directed onto said diffractive optical element at a second range of angles of incidence;

    wherein said first light and said second light substantially overlap on said diffractive optical element and said diffractive optical element diffracts at least a portion of said first light and at least a portion of said second light into a same range of angles of diffraction to obtain light having a desired range of wavelengths.

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