Integrated power supply for an LCD panel

• US 20040189095A1
• Filed: 03/25/2003
• Published: 09/30/2004
• Est. Priority Date: 03/25/2003
• Status: Active Grant

• Current Assignee: O2 Micro International Limited (O2 Micro Incorporated)
• Original Assignee: O2 Micro International Limited (O2 Micro Incorporated)
• Inventors: Liu, Da, Lin, Yung-Lin
• Granted Patent: US 7,057,611 B2
• Time in Patent Office: Days
• US Class Current: 307/43
• CPC Class Codes: G09G 2330/02 Details of power systems and of start or stop of display operation
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

The present invention provides an integrated LCD panel power supply formed on a single printed circuit board. The integrated power supply includes at least one DC/AC control unit, at least one DC/DC buck converter unit and at least one DC/DC boost control unit. Each unit supplies power to an associated function of said LCD. The integrated power supply may also include an oscillator circuit generating a clock signal, and the clock signal is supplied to each unit thereby synchronizing the operation of each unit. The single PCB approach of the present invention eliminates the need for additional wiring between printed circuit boards and thereby eliminates or substantially reduces noise issues associated with such wiring.

Claims

1. An LCD panel power supply, comprising a single printed circuit board comprising at least one DC/AC converter unit, at least one DC/DC buck converter unit and at least one DC/DC boost converter unit, wherein each said unit supplying power to an associated function of said LCD.

2. An LCD panel power supply as claimed in claim 1, further comprising LCD gate driver and source driver power supply control units.

3. An LCD panel power supply as claimed in claim 1, further comprising an oscillator circuit generating a clock signal, said clock signal being supplied to each said unit thereby synchronizing the operation of each said unit.

4. An LCD panel power supply as claimed in claim 2, further comprising a bias signal and reference signal generator circuit supplying a common bias signal and reference signal to each said unit.

5. An LCD panel power supply, comprising a single printed circuit board comprising at least one DC/AC converter unit, at least one DC/DC buck converter unit and at least one DC/DC boost converter unit, wherein each said unit supplying power to an associated function of said LCD;

further comprising an oscillator circuit generating a clock signal, said clock signal being supplied to each said unit thereby synchronizing the operation of each said unit.

6. An LCD panel power supply as claimed in claim 5, further comprising LCD gate driver and source driver power supply control units.

7. An LCD panel power supply as claimed in claim 6, further comprising a bias signal and reference signal generator circuit supplying a common bias signal and reference signal to each said unit.

8. An LCD panel power supply, comprising a single printed circuit board comprising at least one DC/AC converter unit, at least one DC/DC buck converter unit and at least one DC/DC boost converter unit and LCD gate driver and source driver power supply control units, wherein each said unit supplying power to an associated function of said LCD panel.

9. An LCD panel power supply as claimed in claim 8, further comprising an oscillator circuit generating a clock signal, said clock signal being supplied to said at least one DC/AC control unit, at least one DC/DC buck converter unit and at least one DC/DC boost control unit thereby synchronizing the operation of each said unit.

10. An LCD panel power supply as claimed in claim 8, further comprising a bias signal and reference signal generator circuit supplying a common bias signal and reference signal to each said unit.

11. An integrated circuit for controlling power to an LCD panel, comprising a bias and reference signal generator, an oscillator, a DC/AC inverter controller, a DC/DC buck regulator controller, a DC/DC boost regulator controller, and a linear regulator.