Backlight unit and liquid crystal display device having the same

• US 8,960,935 B2
• Filed: 12/26/2007
• Issued: 02/24/2015
• Est. Priority Date: 01/31/2007
• Status: Expired due to Fees

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Jang, Eun Seok, Lee, Sung Keun, Lee, Jae Ho, Lee, Chang Ho, Lee, Yong Kon, Kwon, Oh Sang, Lee, Dae Heung, Kim, Seung Hyun, Park, Jin Seo
• Primary Examiner(s): McManmon, Mary
• Application Number:
  US11/964,432
• Publication Number:
  US 20080180947A1
• Time in Patent Office: 2,617 Days
• Field of Search: 362/97.1, 362/97.2, 362/561, 362/631, 362/97.3, 362/85, 362/221, 362/222, 345/102, 345/47
• US Class Current: 362/97.1
• CPC Class Codes: G02F 1/133604 with lamps

Abstract

Disclosed is a printed circuit board, on which a holder for fixing a lamp is mounted, is disposed on an upper surface of a bottom cover, and an inverter supplying a driving voltage to the lamp is disposed on a lower surface of the bottom cover. The printed circuit board is electrically connected to the holder as a conductive pattern is embedded in the printed circuit board. The connector is directly mounted on the inverter, or it is connected to the inverter via a wire. In this case, the connector is also connected to the printed circuit board. Therefore, the connector of the inverter and the connector of the printed circuit board are electrically connected.

Claims

1. A backlight unit, comprising:

a bottom cover;

a first printed circuit board provided in a first upper surface of the bottom cover and having a first common electrode;

a second printed circuit board provided in a second upper surface of the bottom cover and having a second common electrode;

a plurality of first holders mounted on the first printed circuit board and electrically connected to the first common electrode;

a plurality of second holders mounted on the second printed circuit board and electrically connected to the second common electrode;

a plurality of lamps of which both ends are fixed in the first and second holders, respectively,

an insulator disposed between each of the first and second printed circuit boards and the bottom cover,

a first inverter provided in a first lower surface of the bottom cover,

a second inverter provided in a second lower surface of the bottom cover,

a first and second connectors each connected to the first and second common electrodes, and

a third and fourth connectors each connected to the first and second inverters,

wherein each of the first and second holders includes a plurality of first supports which has a curvature to surround both sides of the lamps, a second supports which has a curvature to support one end of the lamps and a plurality of pedestals which is connected to the first and second common electrodes,

wherein each of the first and second common electrode includes a first pattern and a second pattern,

the first pattern is separated from the second pattern by a first fixed interval,

wherein the first and second connectors are mounted in rear surfaces of the first and second printed circuit boards, respectively, and arranged to be protruded out of the bottom cover by passing a first through hole and a second through hole of the bottom cover, respectively,

wherein the third and fourth connectors are electrically connected to the first and second printed circuit boards, respectively, and mounted on a top of the first inverter and a top of the second inverter, respectively.

2. The backlight unit according to claim 1, further comprising a first wire and a second wire, the first wire being electrically connected to the first printed circuit board, and the second wire being electrically connected to the second printed circuit board.

3. The backlight unit according to claim 1, wherein the third and fourth connectors each are connected to the first and second connectors via the first and second through holes.

4. The backlight according to claim 1, wherein the first and second connectors are each connected to the first and second common electrode and the third and fourth connectors are each connected to the first and second inverters.

5. The backlight unit according to claim 4, wherein the third and fourth connectors each are connected to the first and second connectors via the first and second through holes.

6. The backlight unit according to claim 1 or claim 4, wherein the first and second connectors are protruded from the bottom cover via the first and second through holes, respectively.

7. The backlight unit according to claim 1, wherein each of the first and second printed circuit boards is fastened to the bottom cover.

8. The backlight unit according to claim 1, wherein the first connector is provided with a first insertion recess in which the third connector is inserted, a first pin protruded from the first insertion recess and electrically connected to the third pins of the third connector, and a plurality of first hooks for fixing the first printed circuit board to the bottom cover.

9. The backlight unit according to claim 1, wherein the second connector is provided with a second insertion recess in which the fourth connector is inserted, a second pin protruded from the second insertion recess and electrically connected to the fourth pins of the fourth connector, and a plurality of second hooks for fixing the second printed circuit board to the bottom cover.