Backlight modulation circuit and method thereof

1. A backlight modulation circuit comprising:

a first modulation section configured to generate a first backlight modulation signal;

a second modulation section configured to generate a second backlight modulation signal; and

a backlight modulation section configured to modulate illumination of a backlight module according to the first and second backlight modulation signals;

a signal processing section configured to transform external commands into a first and a second controlling signals, the first and second controlling signals being sent to the first and second modulation sections, respectively; and

wherein the backlight modulation circuit further comprises a first integration circuit, a second integration circuit, and a summing circuit, the first and second integration circuits carry out integration calculations on the first and second backlight modulation signals respectively and output a first and a second analog backlight modulation signals to the summing circuit, the summing circuit carries out a summing calculation with respect to the first and second analog backlight modulation signals and outputs a complex modulation signal to the backlight modulation section, and the backlight modulation section modulates illumination of the backlight module according to the complex backlight modulation signal.

2. The backlight modulation circuit of claim 1 , wherein the first and second modulation sections generate the first and second modulation signals according to the first and second controlling signals, respectively.

3. The backlight modulation circuit of claim 1 , further comprising an amplifying circuit, the amplifying circuit amplifying the analog backlight modulation signal from the first integration circuit and outputting an amplified first analog backlight modulation signal to the summing circuit.

4. The backlight modulation circuit of claim 3 , wherein the signal processing section and the first and second modulation sections are integrated in a scaler.

5. The backlight modulation circuit of claim 4 , further comprising a power supply circuit configured to provide electrical power to the scaler and the backlight modulation section.

6. The backlight modulation circuit of claim 1 , wherein the backlight modulation section is an inverter.

7. The backlight modulation circuit of claim 1 , wherein the backlight modulation section is a light emitting diode driving circuit.

8. The backlight modulation circuit of claim 1 , wherein a minimum modulation range of the first backlight modulation signal exceeds that of the second backlight modulation signal.

9. The backlight module of claim 1 , wherein a first integration section analyzes the first controlling signal to determine whether the first backlight modulation signal is beyond a modulation range of the backlight module, and selects a smaller one of the first backlight modulation signal and a maximum value of the modulation range of the backlight module as the first analog backlight modulation signal.

10. The backlight module of claim 1 , wherein a second integration section analyzes the second backlight modulation signal to determine whether a modulation range of the second modulation signal is beyond a modulation range of the first integration section, and in response to the modulation range of the second modulation signal is beyond the modulation of the first integration signal, a difference value between a minimum value of the modulation range of the first integration section and the second backlight modulation signal is set as the second analog backlight modulation signal; and in response to the modulation range of the second modulation signal is not beyond the modulation range of the first integration signal, the second backlight modulation signal is set as the second analog backlight modulation signal.

11. A method for modulating illumination of a backlight module including a backlight modulation circuit, the backlight modulation circuit comprising a first modulation section, a second modulation section, and a backlight modulation section, the method comprising steps of:

generating a first backlight modulation signal from the first modulation section;

generating a second backlight modulation signal from the second modulation section;

transforming external commands into a first and a second controlling signals from a signal processing section and sending the first and second controlling signals to the first and second modulation sections, respectively;

carrying out integration calculations for the first and second backlight modulation signals respectively to obtain a first and a second analog backlight modulation signals, and carrying out a summing calculation for the first and second analog backlight modulation signals to obtain a complex modulation signal; and

modulating illumination of the backlight module from the backlight modulation section according to the complex modulation signal.

12. The method of claim 11 , further comprising the step of generating the first and second modulation signals according to the first and second controlling signals from the first and second modulation sections, respectively.

13. The method of claim 11 , further comprising amplifying the first analog backlight modulation signal output from the first integration circuit thereby generating an amplified first analog modulation signal, and transmitting the amplified first analog modulation signal to the summing circuit.

14. The method of claim 13 , further comprising the step of providing electrical power for the scaler and the backlight modulation section from a power supply circuit.

15. The method of claim 13 , wherein a minimum modulation range of the first backlight modulation signal is greater than that of the second backlight modulation signal.

16. The method of claim 11 , wherein the step of carrying out integration calculations for the first and second backlight modulation signals comprises: the first modulation section analyzing the first controlling signal to determine whether the first backlight modulation signal is beyond a modulation range of the backlight module, and selecting a smaller one of the first controlling signal and a maximum value of the modulation range of the backlight module as the first analog backlight modulation signal.

17. The method of claim 11 , wherein the step of carrying out integration calculations for the first and second backlight modulation signals comprises the second modulation section analyzing the second backlight modulation signal to determine whether a modulation range of the second modulation signal is beyond a modulation range of the first modulation section, wherein in response to the modulation range of the second modulation signal is beyond the modulation range of the first modulation signal, a difference value between a minimum value of the modulation range of the first modulation section and the second backlight modulation signal is set as the second analog backlight modulation signal; and wherein in response to the modulation range of the second modulation signal is not beyond the modulation range of the first modulation signal, the second backlight modulation signal is set as the second analog backlight modulation signal.