BACKLIGHT SOURCE

• US 20040232854A1
• Filed: 12/02/2003
• Published: 11/25/2004
• Est. Priority Date: 05/23/2003
• Status: Abandoned Application

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Chou, Hui-Kai
• Application Number:
  US10/707,275
• Publication Number:
  US 20040232854A1
• Time in Patent Office: Days
• US Class Current: 315/291
• CPC Class Codes: G02F 1/133604 with lamps
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: G02F 1/133613 characterized by the sequence of light sources

Abstract

A backlight source disposed under a display panel includes a plurality of parallel U-shaped lamps. Each of the U-shaped lamps has a high voltage electrode and a low voltage electrode. The high voltage electrodes of the U-shaped lamps are disposed equally on two sides of the display panel.

Claims

1. A backlight source disposed under a display panel, the backlight source comprising a plurality of parallel U-shaped lamps or call C-shaped lamps, each of the U-shaped or C-shaped lamps having an inner surface and an outer surface and comprising a high voltage electrode and a low voltage electrode, the high voltage electrodes being disposed equally on two sides of the display panel.

2. The backlight source of claim 1 wherein the backlight source is installed in a direct-type backlight panel unit.

3. The backlight source of claim 2 wherein the direct-type backlight unit comprises a diffuser disposed between the display panel and the plurality of the U-shaped lamps for scattering a light source generated by the plurality of the U-shaped lamps to the display panel, a light diffuser plate disposed between the diffuser and the plurality of the U-shaped lamps for transmitting the light source to the diffuser, and a reflecting plate disposed under the plurality of the U-shaped lamps for reflecting the light source to the light diffuser plate.

4. The backlight source of claim 3 wherein the direct-type backlight panel unit further comprises a housing disposed under the reflecting plate for surrounding the reflecting plate, and a bezel for assembling the display panel and the backlight source.

5. The backlight source of claim 1 wherein the U-shaped lamp is a cold cathode fluorescent lamp (CCFL).

6. The backlight source of claim 1 wherein the U-shaped lamps alternately face two opposite sides of the display panel.

7. The backlight source of claim 6 wherein the inner surface of the U-shaped lamp is adjacent to the inner surface of an adjacent U-shaped lamp.

8. The backlight source of claim 6 wherein the outer surface of the U-shaped lamp is adjacent to the outer surface of an adjacent U-shaped lamp.

9. The backlight source of claim 1 wherein the backlight source further comprises a power supply for providing current and a control circuit electrically connected to the power supply for driving the backlight source.

10. The backlight source of claim 9 wherein the control circuit comprises at least one inverter electrically connected to the high voltage electrode and the low voltage electrode of the corresponding U-shaped lamp.

11. The backlight source of claim 10 wherein the inverter comprises a direct current/alternating current (DC/AC) inverter, a pulse width modulation (PWM) inverter or a series resonant parallel loaded (SPRL) inverter.