Voltage supply module and backlight assembly having the same

• US 8,111,005 B2
• Filed: 12/15/2008
• Issued: 02/07/2012
• Est. Priority Date: 01/21/2008
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Min-Soo, Um, Jae-Eun
• Primary Examiner(s): Le, Tung X
• Application Number:
  US12/335,299
• Publication Number:
  US 20090184667A1
• Time in Patent Office: 1,149 Days
• Field of Search: 315/224, 315276-278, 315/282, 315/291, 315/294, 315/297, 315/307, 315/312, 345/102
• US Class Current: 315/291
• 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 for providing at least a lamp driving voltage to at least a lamp, the 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 first electrodes being connected to an output line of the converter; and

a plurality of second electrodes disposed on the first face or the second face, the second electrodes being interspersed between the first electrodes in a plan view of the voltage supply module, 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,

end portions of the second electrodes are electrically connected with each other, and

the second electrodes extend toward the output line and are disposed substantially parallel with each other.

4. 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 a waveform of a driving voltage to a protection circuit for protecting the voltage supply module, the driving voltage being applied to the first electrodes through the output line of the converter.

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

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

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 a driving voltage to a protection circuit for protecting the voltage supply module, the driving voltage being applied to the first electrodes through the output line of the converter.

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

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

11. A backlight assembly, comprising:

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

a voltage supply module for providing at least a lamp driving voltage to at least the lamp, the voltage supplying 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 first electrodes being connected to an output line of the converter; and

a plurality of second electrodes disposed on the first face or the second face, the second electrodes being interspersed between the first electrodes in a plan view of the voltage module, 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 11, wherein the backlight assembly comprises a plurality of lamps electrically connected to a plurality of 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 of the capacitor of the voltage supply module are electrically connected in parallel with the output line, and the second electrodes of the capacitor of the voltage supply module are disposed to alternate with the first electrodes of the capacitor of the voltage supply module.

15. The backlight assembly of claim 11, wherein the second electrodes of the capacitor of the voltage supply module are disposed on the second face and are disposed between the first electrodes of the capacitor of the voltage supply module in the plan view of the voltage module.

16. The backlight assembly of claim 11, wherein the second electrodes of the capacitor of the voltage supply module are disposed on the first face and are disposed between the first electrodes of the capacitor of the voltage supply module.

17. The backlight assembly of claim 11, wherein each of the first electrodes of the capacitor of the voltage supply module extends from the output line and is bent to have a V-shape, and each of the second electrodes of the capacitor of the voltage supply module is disposed between the first electrodes and is V-shaped in the plan view of the voltage module.

18. The backlight assembly of claim 11, wherein at least one of the first electrodes of the capacitor of the voltage supply module spirals around a center defined on the first face so that an end portion of the at least one of the first electrodes of the capacitor of the voltage supply module approaches the center, and at least one of the second electrodes of the capacitor of the voltage supply module spirals around the center without overlapping with the at least one of the first electrodes of the capacitor of the voltage supply module, an end portion of the at least one of the second electrodes of the capacitor of the voltage supply module approaching the center.

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.