Display panel with image sticking elimination circuit and driving circuit with the same

• US 20070176866A1
• Filed: 01/31/2006
• Published: 08/02/2007
• Est. Priority Date: 01/31/2006
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Toppoly Optoelectronics Corporation (InnoLux Corporation)
• Inventors: Teng, Wen-Chieh, Chen, Jun-Chang, Hung, Jui-Lung
• Granted Patent: US 8,040,309 B2
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G09G 2320/0257 Reduction of after-image effects
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A display panel with image sticking elimination circuit is provided. The image sticking elimination circuit can be applied in a display unit comprising a plurality of pixel units driven by a gate driving circuit and a data driving circuit. The gate driving circuit is driven by a first voltage and a second voltage. The first voltage turns on the pixel units for receiving data signals and the second voltage turns off the pixel units for preventing the pixel units from receiving data signals. A switch is coupled between a data line driven by the data driving circuit and an ESD circuit. The image sticking elimination circuit is charged by the first voltage and the charged power is output to turn on the switch and the pixel units when abnormal power shut down occurs.

Claims

1. A display panel with an image sticking elimination circuit comprising a plurality of pixel units driven by a gate driving circuit and a data driving circuit, said gate driving circuit being driven by a first voltage and a second voltage, said first voltage turning on said pixel units for receiving signals from said data driving circuit, said second voltage turning off said pixel units for preventing said pixel units from receiving signals from said data driving circuit, said image sticking elimination circuit comprising:

a charge storage device, having a first terminal and a second terminal, said first terminal of said charge storage device being coupled to said first voltage, said second terminal of said charge storage device being coupled to ground;

an isolation device, having a first terminal, a second terminal and a third terminal, said first terminal of said isolation device being coupled to said first terminal of said charge storage device, said second terminal of said isolation device being coupled to said first voltage, said third terminal of said isolation device being coupled to said second voltage, said isolation device being turned on when said abnormal power shut down occurs; and

a switch, coupled between a data line driven by said data driving circuit and an ESD circuit, said switch determines whether or not to turn itself on according to voltage of said third terminal of said isolation device, and said switch is turned on when an abnormal power shut down occurs.

2. The display panel of claim 1, further comprising a diode coupled between said first voltage and said charge storage device.

3. The display panel of claim 1, wherein said isolation device is a P-type MOSFET.

4. The display panel of claim 1, wherein said isolation device is a P-type JFET.

5. The display panel of claim 1, wherein said isolation device is a MOSFET.

6. The display panel of claim 1, wherein said isolation device is a JFET.

7. The display panel of claim 1, wherein said charge storage device is a capacitor.

8. The display panel of claim 1, wherein said switch is a MOSFET, and a gate of said MOSFET is controlled by the first voltage.

9. The display panel of claim 1, wherein said switch is a JFET, and a gate of said JFET is controlled by the first voltage.

10. A display panel with an image sticking elimination circuit comprising a plurality of pixel units driven by a gate driving circuit and a data driving circuit, said gate driving circuit being driven by a first voltage and a second voltage, said first voltage turning on said pixel units for receiving data signals, said second voltage turning off said pixel units for preventing said pixel units from receiving data signals, said display panel being characterized in comprising:

a switch, coupling between a data line driven by said data driving circuit and an ESD circuit, wherein said image sticking elimination circuit being charged by said first voltage, and outputting charged power to turn on said switch and said pixel units when an abnormal power shut down occurs.

11. The display panel of claim 10, wherein said image sticking elimination circuit is coupled to said gate driving circuit and outputs the charged power to said gate driving circuit to drive said pixel units when said abnormal power shut down occurs.

12. A driving circuit for a display panel comprising a plurality of pixel units, said driving circuit comprising:

a voltage converter, for outputting a first voltage and a second voltage;

a gate driving circuit with a plurality of gate lines, for driving said pixel units, each of said pixel units coupling to one of said plurality of gate lines according to said first and second voltages, wherein said first voltage turns said pixel units on and said second voltage turns said pixel units off;

a data driving circuit with a plurality of data lines, for outputting signals to the data lines;

a plurality of switches, each of said switches coupling between a corresponding one of said data lines and an ESD circuit; and

an image sticking elimination circuit, charged by said first voltage, wherein when an abnormal power shut down occurs, charged power is output to turn on said pixel units and switches.

13. The driving circuit of claim 12, wherein said image sticking elimination circuit is coupled to said gate driving circuit and the charged power is output to said gate driving circuit to drive said pixel units when said abnormal power shut down occurs.