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Direct-type backlight unit having surface light source

  • US 7,887,225 B2
  • Filed: 07/05/2007
  • Issued: 02/15/2011
  • Est. Priority Date: 07/10/2006
  • Status: Expired due to Fees
First Claim
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1. A direct-type backlight unit comprising:

  • a board having upper and lower surfaces defining a thickness therebetween; and

    a plurality of unit light sources mounted on the board,wherein each of the unit light sources comprises;

    a wiring pattern formed on the board; and

    a light emitting device disposed on the wiring pattern to electrically connect thereto;

    a non-conductive side wall surrounding, without interruption, the light emitting device at a predetermined interval therefrom, the non-conductive side wall having a height lower than that of the light emitting device;

    an encapsulant formed in a dome shape inside the side wall, the encapsulant comprising a transparent resin or a phosphor-mixed transparent resin; and

    an opaque layer or a light diffusing layer formed on an upper end portion of the encapsulant, bounded by an area corresponding to the light emitting device, located in a vertical upward direction of the light emitting device and blocks light generated from the light emitting device from traveling in an upward direction to prevent a bright light spot from forming,wherein the non-conductive side wall has a ring shaped structure with a through hole formed inside thereof and blocks a resin dispensed inside the non-conductive side wall from spreading out to form the dome shaped encapsulant.

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