DRIVING METHOD FOR DISPLAY PANEL AND DISPLAY APPARATUS

• US 20110175878A1
• Filed: 05/26/2010
• Published: 07/21/2011
• Est. Priority Date: 01/18/2010
• Status: Abandoned Application

• Current Assignee: Chunghwa Picture Tubes Limited
• Original Assignee: Chunghwa Picture Tubes Limited
• Inventors: Hsiao, Chung-Chih, Huang, Chiao-Lin, Lin, Shu-Yang
• Application Number:
  US12/788,282
• Publication Number:
  US 20110175878A1
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A driving method for a display panel is provided. The driving method includes detecting whether the display panel switches between frames; and down-regulating/up-regulating the frame rate of the display panel and adjusting the voltage value of a gate-on power source when the display panel switches from a dynamic frame to a static frame or switches from the static frame to the dynamic frame, so as to change a charging current of pixels in the display panel.

Claims

1. A driving method of a display panel, comprising:

detecting whether the display panel is switched from a dynamic frame to a static frame; and

when the display panel is switched from the dynamic frame to the static frame, down-regulating a frame rate of the display panel and adjusting a voltage of a gate-on power source so as to change a charging current of pixels of the display panel.

2. The driving method of claim 1, wherein when the frame rate of the display panel is down-regulated, the step of adjusting the voltage of the gate-on power source comprises:

decreasing the voltage of the gate-on power source.

3. The driving method of claim 2, wherein when the voltage of the gate-on power source is decreased, the step of changing the charging current of the pixels of the display panel comprises:

decreasing the charging current of the pixels of the display panel.

4. The driving method of claim 3, further comprising:

when the display panel is not switched from the dynamic frame to the static frame, keeping the frame rate of the display panel, the voltage of the gate-on power source and the charging current of the pixels of the display panel unchanged.

5. The driving method of claim 4, wherein the pixels of the display panel charged by the decreased charging current obtain a first amount of charges equal to a second amount of charges obtained by charging the pixels of the display panel with the unchanged charging current.

6. A driving method of a display panel, comprising:

detecting whether the display panel is switched from a static frame to a dynamic frame; and

when the display panel is switched from the static frame to the dynamic frame, up-regulating the frame rate of the display panel and adjusting a voltage of a gate-on power source so as to change a charging current of pixels of the display panel.

7. The driving method of claim 6, wherein when the frame rate of the display panel is up-regulated, the step of adjusting the voltage of the gate-on power source comprises:

increasing the voltage of the gate-on power source.

8. The driving method of claim 7, wherein when the voltage of the gate-on power source is increased, the step of changing the charging current of the pixels of the display panel comprises:

increasing the charging current of the pixels of the display panel.

9. The driving method of claim 8, further comprising:

when the display panel is not switched from the static frame to the dynamic frame, keeping the frame rate of the display panel, the voltage of the gate-on power source and the charging current of the pixels of the display panel unchanged.

10. The driving method of claim 9, wherein the pixels of the display panel charged by the increased charging current obtain a first amount of charges equal to a second amount of charges obtained by charging the pixels of the display panel with the unchanged charging current.

11. A display device, comprising:

a display panel having a plurality of pixels arranged in an array, for displaying a dynamic frame or a static frame;

a timing controller for detecting whether the display panel switches between frames so as to regulate a frame rate of the display panel accordingly and to output a gate-on power source switching signal;

a gate-on power source switching unit coupled to the timing controller for receiving two gate-on power sources with different voltages and for outputting one of the two gate-on power sources according to the gate-on power source switching signal; and

a gate driver coupled to the display panel, the timing controller and the gate-on power source switching unit, wherein the gate driver is controlled by the timing controller and used for sequentially outputting a scan signal to turn on each pixel row of the display panel one by one according to the output of the gate-on power source switching unit.

12. The display device of claim 11, wherein the timing controller down-regulates the frame rate of the display panel and outputs the gate-on power source switching signal with a first state when the timing controller detects that the display panel is switched from the dynamic frame to the static frame.

13. The display device of claim 12, wherein the gate-on power source switching unit outputs a first gate-on power source with a relatively lower voltage between the two gate-on power sources according the gate-on power source switching signal with the first state.

14. The display device of claim 13, wherein the gate driver sequentially outputs the scan signal having a voltage of the first gate-on power source so as to turn on each pixel row of the display panel one by one.

15. The display device of claim 13, wherein the timing controller up-regulates the frame rate of the display panel and outputs the gate-on power source switching signal with a second state when the timing controller detects that the display panel is switched from the static frame to the dynamic frame.

16. The display device of claim 15, wherein the gate-on power source switching unit outputs a second gate-on power source with a relatively higher voltage between the two gate-on power sources according the gate-on power source switching signal with the second state.

17. The display device of claim 16, wherein the gate driver sequentially outputs the scan signal having a voltage of the second gate-on power source so as to turn on each pixel row of the display panel one by one.

18. The display device of claim 16, wherein the timing control keeps the frame rate of the display panel to be a first frame rate and outputs the gate-on power source switching signal with the second state when the timing controller detects that the display panel is not switched from the dynamic frame to the static frame.

19. The display device of claim 18, wherein the timing control keeps the frame rate of the display panel to be a second frame rate and outputs the gate-on power source switching signal with the first state when the timing controller detects that the display panel is not switched from the static frame to the dynamic frame.

20. The display device of claim 19, wherein the first frame rate is higher than the second frame rate.

21. The display device of claim 16, wherein the gate-on power source switching unit comprises:

a first transistor having a gate receiving the gate-on power source switching signal with the first state or the second state, a first drain/source receiving the first gate-on power source, and a second drain/source outputting the first gate-on power source; and

a second transistor having a gate receiving the gate-on power source switching signal with the first state or the second state, a first drain/source receiving the second gate-on power source, and a second drain/source outputting the second gate-on power source.

22. The display device of claim 21, wherein the first transistor is a P-type transistor and the second transistor is an N-type transistor.

23. The display device of claim 16, further comprising:

a source driver coupled to the display panel and the timing controller, wherein the source driver is controlled by the timing controller and used for correspondingly providing a pixel data to the pixels, which are turned on by the gate driver, in each pixel row of the display panel;

a backlight module for providing a backlight source required by the display panel; and

a power supply unit coupled to the gate-on power source switching unit, the gate driver and the display panel, wherein the power supply unit provides the first and the second gate-on power sources to the gate-on power source switching unit, provides a gate-off power source to the gate driver and provides a common voltage to the display panel.