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Projection display apparatus having plural light sources

  • US 8,491,130 B2
  • Filed: 02/22/2011
  • Issued: 07/23/2013
  • Est. Priority Date: 03/04/2010
  • Status: Active Grant
First Claim
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1. A projection display apparatus comprising:

  • a plurality of light sources;

    a plurality of light source power supplies configured to supply electric power to the plurality of light sources; and

    a lighting controller configured to control the plurality of light source power supplies so as to select and light at least one light source of the plurality of light sources in accordance with lighting history of each of the plurality of light sources,wherein the lighting controller lights a second of the plurality of light sources continuously after the lighting history of a first of the plurality of light sources reaches a predetermined value,wherein the lighting controller lights the first light source after the lighting history of the second light source reaches a predetermined lifetime value.

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