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Planar light source device and display device using the same

  • US 7,300,184 B2
  • Filed: 05/17/2005
  • Issued: 11/27/2007
  • Est. Priority Date: 06/07/2004
  • Status: Expired due to Fees
First Claim
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1. A planar light source device comprising:

  • a housing having an opening portion in an upper surface thereof;

    a plurality of light source units, each including a light guiding rod arranged in the housing and at least one point light source disposed so as to oppose at least one end face of the light guiding rod and emit light to the one end face; and

    a reflection plate disposed below the plurality of light source units in the housing and reflects light emitted from the light source units to the opening portion,wherein each of the light guiding rods has a light emission means for varying a light emission rate in accordance with a distance from the point light source to one end face thereof, the light emission means being an uneven surface whose roughness is varied in accordance with the distance.

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