Method and system of controlling backlight driving
OwnerXianming Zhanginventor
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Abstract
The present disclosure proposes a method and a system of controlling backlight driving. The method includes receiving an initial-pulse-width modulating signal and outputting a corresponding pulse-width modulating signal according to the initial-pulse-width modulating signal. The pulse-width modulating signal is used to control a corresponding LED string to illuminate. A cycle of each of the pulse-width modulating signals is the same with a predetermined phase difference.
Claims12
A method of controlling backlight driving, configured to control a plurality of light-emitting diode (LED) strings in parallel in a backlight driving system to illuminate;
- the method of controlling backlight driving comprising:
- receiving an initial-pulse-width modulating signal;
- outputting a corresponding pulse-width modulating signal according to the initial-pulse-width modulating signal;
- the pulse-width modulating signal being configured to control a corresponding LED string to illuminate;
- wherein a cycle of each of the pulse-width modulating signals is the same with a predetermined phase difference,
- wherein the backlight driving system comprises N channels;
- each of the N channels corresponds to a group of the LED strings;
- the corresponding pulse-width modulating signal is output according to the initial-pulse-width modulating signal;
- the pulse-width modulating signal is configured to control a corresponding LED string to illuminate;
- the method comprises:
- at t=(i−1)*T/N, outputting an ith pulse-width modulating signal to control a group of the LED strings to illuminate according to the initial-pulse-width modulating signal;
- at t=(j−1)*T/N, outputting a jth pulse-width modulating signal to control another group of the LED strings to illuminate according to the initial-pulse-width modulating signal;
- wherein a phase difference between the ith pulse-width modulating signal and the jth pulse-width modulating signal is (j−i)*T/N where 1≤i<j≤N stands, and i, j, and N are all positive integers.
A backlight driving system, comprising:
- a main controlling device, configured to output an initial-pulse-width modulating signal;
- a backlight controlling circuit, configured to output a corresponding pulse-width modulating signal according to the initial-pulse-width modulating signal to drive a corresponding light-emitting diode (LED) light string to illuminate;
- a power source;
- and
- a voltage conversion circuit, configured to receive an output voltage imposed on the power source and a voltage modulating signal of the backlight controlling circuit and convert the output voltage imposed on the power source into the backlight driving voltage which drives the LED string to illuminate according to the voltage modulating signal;
- wherein a cycle of each of the pulse-width modulating signals is the same with a predetermined phase difference.
A method of controlling backlight driving, configured to control a plurality of light-emitting diode (LED) strings in parallel in a backlight driving system to illuminate;
- the method of controlling backlight driving comprising:
- receiving an initial-pulse-width modulating signal;
- at t=(i−1)*T/N, outputting an ith pulse-width modulating signal to control a group of the LED strings to illuminate according to the initial-pulse-width modulating signal;
- at t=(j−1)*T/N, outputting a jth pulse-width modulating signal to control another group of the LED strings to illuminate according to the initial-pulse-width modulating signal;
- wherein a cycle of each of the pulse-width modulating signals is the same with a predetermined phase difference, and a phase difference between the ith pulse-width modulating signal and the jth pulse-width modulating signal is (j−i)*T/N where 1≤i<j≤N stands, and i, j, and N are all positive integers.
Dependencies are inferred from the claim text.