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Backlight device and display unit provided with it

DC
  • US 7,449,838 B2
  • Filed: 09/09/2004
  • Issued: 11/11/2008
  • Est. Priority Date: 09/12/2003
  • Status: Expired due to Fees
First Claim
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1. A backlight device comprising:

  • a first light source group including one or more light sources that emit visible light and infrared rays;

    a second light source group including one or more light sources that emit visible light and infrared rays; and

    a drive unit that drives the one or more light sources of said first light source group in response to a first synchronous signal and drives the one or more light sources of said second light source group in response to a second synchronous signal, whereina phase difference between said first synchronous signal and said second synchronous signal is within a range larger than 60 degrees and smaller than 120 degrees or a range larger than 240 degrees and smaller than 300 degrees.

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