Display system and method for displaying an image with a high quality

1. A method for displaying an image comprising:

acquiring a data clock signal;

acquiring a vertical synchronization signal;

generating a backlight driving signal according to the vertical synchronization signal; and

displaying the image by using a display system according to the data clock signal, the vertical synchronization signal, and the backlight driving signal;

wherein the data clock signal comprises a first square wave, the vertical synchronization signal comprises a second square wave, and no common time interval is between a first time interval corresponding to the first square wave and a second time interval corresponding to the second square wave; and

wherein the backlight driving signal comprises a composite wave synthesized by a third square wave and at least one pulse width modulation signal.

2. The method of claim 1 , wherein a third time interval corresponding to the composite wave is within the second time interval.

3. The method of claim 1 , wherein a portion of a third time interval corresponding to the composite wave is outside the second time interval.

4. The method of claim 3 , wherein timing of a falling edge of the third square wave is outside the second time interval, and timing of a rising edge of the third square wave substantially matches with a rising edge of the second time interval.

5. The method of claim 3 , wherein timing of a rising edge of the third square wave is outside the second time interval, and timing of a falling edge of the third square wave substantially matches with a falling edge of the second time interval.

6. The method of claim 1 , wherein the second time interval is within a third time interval corresponding to the composite wave.

7. The method of claim 1 , further comprising:

enabling all light-emitting components of a light-emitting array of a backlight module during a third time interval corresponding to the composite wave; and

disabling all light-emitting components of the light-emitting array of the backlight module after the third time interval elapses.

8. The method of claim 1 , wherein the display system is a direct back-lit display system or an edge light-emitting diode (LED) back-lit display system.

9. The method of claim 1 , wherein the third square wave is a pulse width modulation signal, and a peak duty cycle of the pulse width modulation signal is substantially equal to 1/20.

10. The method of claim 1 , wherein the backlight driving signal is generated by a backlight driving control device, and the backlight driving control device generates the backlight driving signal according to at least one pulse width modulation signal.

11. The method of claim 1 , further comprising:

boosting a driving voltage corresponding to the data clock signal according to a driving voltage table of a plurality of driving voltage tables;

wherein the plurality of driving voltage tables correspond to a plurality of refresh frequencies.

12. The method of claim 11 , wherein the plurality of refresh frequencies comprises a plurality of different refresh frequencies predetermined in an ascending order, each driving voltage table of the plurality of driving voltage tables comprises a boosting gain, and a boosting gain corresponding to a small refresh frequency is smaller than a boosting gain corresponding to a large refresh frequency.

13. The method of claim 1 , further comprising:

adjusting a dynamic brightness curve of the display system so as to increase at least one portion of the dynamic brightness curve above a standard dynamic brightness curve.

14. The method of claim 13 , wherein the dynamic brightness curve comprises a shadow tone portion, a medium tone portion, and a highlight tone portion, a shadow tone portion and a highlight tone portion of the adjusted dynamic brightness curve are above the standard dynamic brightness curve, and a medium tone portion is close to the standard dynamic brightness curve.

15. A display system comprising:

a backlight driving device configured to generate a switch control signal and a current control signal according to a current dividing signal, a backlight driving signal, and a maximum current setting signal; and

a backlight module coupled to the backlight driving device and configured to drive at least one light-emitting diode string according to the switch control signal and the current control signal;

wherein the backlight driving device comprises a driving circuit configured to receive the current dividing signal through a voltage divider formed by a plurality of resistors, the backlight driving signal through a resistor-capacitor (RC) circuit, and the maximum current setting signal through a resistor; and

wherein the backlight driving signal comprises a composite wave synthesized by a third square wave and at least one pulse width modulation signal.

16. The display system of claim 15 , further comprising:

a processor device coupled to the backlight driving device and configured to generate a data clock signal and a vertical synchronization signal;

wherein the backlight driving signal is generated according to the vertical synchronization signal, the data clock signal comprises a first square wave, the vertical synchronization signal comprises a second square wave, and no common time interval is between a first time interval corresponding to the first square wave and a second time interval corresponding to the second square wave.

17. The display system of claim 16 , wherein a third time interval corresponding to the composite wave is within the second time interval.

18. The display system of claim 16 , wherein a portion of a third time interval corresponding to the composite wave is outside the second time interval.

19. The display system of claim 18 , wherein timing of a falling edge of the third square wave is outside the second time interval, and timing of a rising edge of the third square wave substantially matches with a rising edge of the second time interval.

20. The display system of claim 18 , wherein timing of a rising edge of the third square wave is outside the second time interval, and timing of a falling edge of the third square wave substantially matches with a falling edge of the second time interval.

21. The display system of claim 16 , wherein the second time interval is within a third time interval corresponding to the composite wave.