VOLTAGE SUPPLY MODULE AND BACKLIGHT ASSEMBLY HAVING THE SAME

• US 20090184667A1
• Filed: 12/15/2008
• Published: 07/23/2009
• Est. Priority Date: 01/21/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Min-Soo, Um, Jae-Eun
• Granted Patent: US 8,111,005 B2
• Time in Patent Office: Days
• US Class Current: 315/297
• CPC Class Codes: H05B 41/2822 using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
• CPC Class Codes: H05K 1/0231 Capacitors or dielectric substances
• CPC Class Codes: H05K 1/162 incorporating printed capacitors
• CPC Class Codes: H05K 2201/10136 Liquid Crystal display [LCD]

Abstract

In a voltage supply module and a backlight assembly having the same, a converter is disposed on a first face of a board and converts basic voltage into driving voltage. A capacitor includes at least one first electrode connected to an output line of the converter and at least one second electrode disposed to be spaced apart from the first electrode along a direction substantially parallel with the first face. A plurality of the second electrodes are disposed on the board between the first electrodes. The first and second electrodes form a ballast capacitance.

Claims

1. A voltage supply module, comprising:

a board comprising a first face and a second face opposite the first face;

a converter operative to convert an externally provided first voltage into a second voltage; and

a capacitor comprising;

a plurality of first electrodes disposed on the first face, the plurality of first electrodes connected to an output line of the converter; and

a plurality of second electrodes disposed on the first face or the second face, the plurality of second electrodes interspersed between the first electrodes, the second electrodes being spaced apart from the first electrodes along a plane substantially parallel with a plane of the first face.

2. The voltage supply module of claim 1, wherein the second electrodes are disposed on the second face.

3. The voltage supply module of claim 2, wherein the first electrodes extend from the output line, and

end portions of the second electrodes are electrically connected with each other, the second electrodes extend toward the output line and the second electrodes are disposed substantially parallel with each other.

4. The voltage supply module of claim 1, wherein the first electrodes and the second electrodes extend along a straight line.

5. The voltage supply module of claim 1, wherein the first electrodes and the second electrodes are bent and extend substantially parallel with each other.

6. The voltage supply module of claim 2, further comprising a sensing line disposed on the second face and electrically connected to the second electrodes, the sensing line transmitting sensing signals including signals corresponding to the state of the driving voltage to a protection circuit for protecting the voltage supply module.

7. The voltage supply module of claim 1, wherein the second electrodes are disposed on the first face.

8. The voltage supply module of claim 7, further comprising a sensing line disposed on the first face and electrically connected to the second electrodes, the sensing line transmitting sensing signals including signals corresponding to the state of the driving voltage to a protection circuit for protecting the voltage supply module.

9. The voltage supply module of claim 1, wherein a plurality of the output lines extend from the converter and the capacitor is electrically connected to each of the output lines.

10. The voltage supply module of claim 9, the voltage supply module comprising a plurality of the converters.

11. A backlight assembly, comprising:

a lamp comprising a lamp tube, a first terminal and a second terminal disposed on the lamp tube; and

a voltage supply module, comprising;

a board comprising a first face and a second face opposite the first face;

a converter operative to convert an externally provided first voltage into a second voltage; and

a capacitor comprising;

a plurality of first electrodes disposed on the first face, the plurality of first electrodes connected to an output line of the converter; and

a plurality of second electrodes disposed on the first face or the second face, the plurality of second electrodes interspersed between the first electrodes, the second electrodes being spaced apart from the first electrodes along a plane substantially parallel with a plane of the first face.

12. The backlight assembly of claim 11, wherein the second terminal is grounded.

13. The backlight assembly of claim 12, wherein a plurality of the lamps are electrically connected to a plurality of the output lines, respectively, and the capacitor is electrically connected in parallel with each of the output lines.

14. The backlight assembly of claim 11, wherein the first electrodes are electrically connected in parallel with the output line and the second electrodes are disposed to alternate with the first electrodes.

15. The backlight assembly of claim 14, wherein the second electrodes are disposed on the second face between the first electrodes.

16. The backlight assembly of claim 14, wherein the second electrodes are disposed on the first face between the first electrodes.

17. The backlight assembly of claim 14, wherein each of the first electrodes extends from the output line and is bent to have a V-shape and each of the second electrodes is disposed between the first electrodes to have a V-shape.

18. The backlight assembly of claim 11, wherein the first electrode turns around a center of rotation defined on the first face so that an end portion of the first electrode approaches the center of rotation and the second electrode turns around the center of rotation so as not to overlap with the first electrode so that an end portion of the second electrode approaches the center of rotation.

19. The backlight assembly of claim 11, wherein the voltage supply module further comprises a sensing line electrically connected to the second electrodes, the sensing line transmitting sensing signals including signals corresponding to the state of the lamp driving voltage to a protection circuit for protecting the backlight assembly.