Image sticking prevention circuit for display device
View Patent ↗An image sticking prevention circuit for a display. The image sticking prevention circuit comprises a diode, a first capacitor, a transistor, and a second capacitor. The first terminal of the diode is coupled to a first voltage terminal of a voltage converter. The first capacitor has a first terminal coupled to the second terminal of the diode and a second terminal coupled to a first fixed potential. The transistor has a first terminal coupled to the first terminal of the first capacitor, a second terminal coupled to the first terminal of the diode and the first voltage terminal of the voltage converter, and a third terminal coupled to a second voltage terminal of the voltage converter and a gate driver circuit. The second capacitor has a first terminal coupled to the third terminal of the transistor and a second terminal coupled to a second fixed potential.
1. An image sticking prevention circuit for a power-off mode of a display, the image sticking prevention circuit comprising:
a diode having a first terminal and a second terminal, the first terminal of the diode coupled to a first voltage terminal of a voltage converter;
a first capacitor having a first terminal coupled to the second terminal of the diode and a second terminal coupled to a first fixed potential;
a transistor having a first terminal coupled to the first terminal of the first capacitor, a second terminal coupled to the first terminal of the diode and the first voltage terminal of the voltage converter, and a third terminal coupled to a gate driver circuit and a second voltage terminal of the voltage converter; and
a second capacitor having a first terminal coupled to the third terminal of the transistor and a second terminal coupled to a second fixed potential.
2. The image sticking prevention circuit of claim 1 , wherein the transistor is a PMOS transistor and the first terminal of the diode is an anode thereof.
3. The image sticking prevention circuit of claim 2 , wherein the first voltage terminal of the voltage converter provides a positive voltage.
4. The image sticking prevention circuit of claim 3 , wherein the second fixed potential is the second voltage terminal of the voltage converter.
5. The image sticking prevention circuit of claim 1 , wherein the transistor is a NMOS transistor and the first terminal of the diode is a cathode thereof.
6. The image sticking prevention circuit of claim 5 , wherein the first voltage terminal of the voltage converter provides a negative voltage.
7. The image sticking prevention circuit of claim 6 , wherein the second fixed potential is the second voltage terminal of the voltage converter.
8. The image sticking prevention circuit of claim 1 , wherein the second fixed potential is the first fixed potential.
9. The image sticking prevention circuit of claim 1 , wherein the first fixed potential is a ground.
10. The image sticking prevention circuit of claim 1 , wherein the voltage converter is a DC-to-DC converter.
11. The image sticking prevention circuit of claim 1 , wherein the display is a liquid crystal display.
12. The image sticking prevention circuit of claim 1 , wherein a capacitance of the second capacitor is 0.1 μF to 10 μF.
13. An integrated circuit comprising the image sticking prevention circuit of claim 1 .
14. A display device, comprising:
a pixel array;
a gate driver circuit coupled to the pixel array;
a voltage converter coupled to the gate driver circuit; and
an image sticking prevention circuit of claim 1 coupled to the gate driver circuit and the voltage converter.
15. An electronic device, comprising:
a display device of claim 14 ; and
a user interface operatively coupled to the display device to control the display device.