LED backlight unit
View Patent ↗An LED backlight unit includes a light source; a board including a circuit pattern printed on an underside thereof, and having at least one mounting hole perforated therein where the light source is inserted; a metal chassis having an inside surface on which an underside of the light source is mounted, and receiving the board to be arranged in parallel to and with a gap from the metal chassis; and a reflector arranged on a top surface of the board to reflect light generated from the light source. The heat radiating path for transferring heat from the light source to the outside can be more simplified to enhance heat radiation efficiency thereby raising product reliability. The number of whole components can be reduced and the board with the light mounted thereon can be replaced with an inexpensive part thereby saving fabrication cost.
1. A light emitting diode backlight unit comprising:
a light source;
a board including a circuit pattern printed on an underside thereof, and having at least one mounting hole perforated therein where the light source is inserted;
a metal chassis having an inside surface on which an underside of the light source is mounted, and receiving the board to be arranged in parallel to and with a gap from the metal chassis; and
a reflector arranged on a top surface of the board to reflect light generated from the light source,
wherein the light source includes: a light emitting chip for generating light when a supply voltage is applied thereto, a heat conducting member wherein the light emitting chip is seated on a top surface thereof, a lead electrically connected to the light emitting chip, and a molding configured to integrally hold the heat conducting member and the lead; and
wherein the molding has a step formed in an upper outer periphery, the step configured to be fitted into the mounting hole.
2. The light emitting diode backlight unit according to claim 1 , wherein the heat conducting member comprises a heat conductive metal exposed through an underside surface of the molding to be mounted on the inside surface of the metal chassis.
3. The light emitting diode backlight unit according to claim 1 , wherein the lead comprises a lead terminal of a predetermined length with one end connected to the light emitting chip and the other end bent upward to be connected to the circuit pattern of the board.
4. The light emitting diode backlight unit according to claim 1 , wherein the lead comprises an electrode terminal with one end connected to the light emitting chip and the other end connected to the circuit pattern on the underside of the board and exposed through an upper surface of the molding.
5. The light emitting diode backlight unit according to claim 1 , further comprising a lens arranged on an upper portion of the molding.
6. The light emitting diode backlight unit according to claim 1 , wherein the reflector comprises a reflective material coating of a predetermined thickness arranged on an upper surface of the board opposite to the underside thereof where the circuit pattern is printed.
7. The light emitting diode backlight unit according to claim 1 , wherein the reflector comprises a reflective material deposition of a predetermined thickness arranged on an upper surface of the board opposite to the underside thereof where the circuit pattern is printed.
8. The light emitting diode backlight unit according to claim 1 , wherein the reflector comprises a reflective material printing of a predetermined thickness arranged on an upper surface of the board opposite to the underside thereof where the circuit pattern is printed.
9. The light emitting diode backlight unit according to claim 1 , wherein the reflector comprises a reflective sheet bonded via adhesive onto an upper surface of the board opposite to the underside thereof where the circuit pattern is printed.
10. The light emitting diode backlight unit according to claim 1 , further comprising a liquid crystal display panel a diffuser sheet above the light source.
11. The light emitting diode backlight unit according to claim 10 , further comprising a light guide plate between the light source and the diffuser sheet.