Driving device, backlight with the driving device and driving method of backlight
View Patent ↗The present disclosure relates to a driving device for a backlight with a plurality of LED units. The driving device can include a control module for controlling output voltage of the driving device; a light modulation module for adjusting overall current of the backlight; and a current regulating module for obtaining signals for adjusting individual current of each LED unit and adjusting the individual current of each LED unit according to the signals.
1. A driving device for a backlight with a plurality of LED units, comprising:
a control module for controlling output voltage of the driving device;
a light modulation module for adjusting overall current of the plurality of LED units; and
a current regulating module for obtaining signals for adjusting individual current of each LED unit according to the signals;
wherein the current regulating module comprises a receiving unit for receiving signals for adjusting the individual current of each LED unit in the backlight and a plurality of storing units for storing those signals.
2. The driving device according to claim 1 , wherein each of the signals is a digital signal and the current regulating module further comprises a digital/analogous conversion unit for converting the digital signal into an analogous signal sent to each LED unit so as to adjust resistance of each LED unit.
3. The driving device according to claim 1 , wherein the current regulating module comprises a plurality of voltage regulators, each voltage regulator comprises a sampling resistor.
4. The driving device according to claim 1 , wherein each LED unit is a color LED unit selected from a red LED, a green LED and a blue LED.
5. A backlight, comprising:
a plurality of LED units; and
a driving device, comprising:
a control module for controlling output voltage of the driving device;
a light modulation module for adjusting overall current of the plurality of LED units; and
a current regulating module for obtaining signals for adjusting individual current of each LED unit according to the signals;
wherein the current regulating module comprises a receiving unit for receiving signals for adjusting the individual current of each LED unit in the backlight and a plurality of storing units for storing those signals.
6. The backlight according to claim 5 , wherein each of the signals is a digital signal and the current regulating module further comprises a digital/analogous conversion unit for converting the digital signal into an analogous signal sent to each LED unit so as to adjust resistance of each LED unit.
7. The backlight according to claim 5 , wherein the current regulating module comprises a plurality of voltage regulators, each voltage regulator comprises a sampling resistor.
8. The backlight according to claim 5 , wherein each LED unit is a color LED unit selected from a red LED, a green LED and a blue LED.
9. A method of driving a LED backlight with a plurality of LED units, the method comprising following steps of:
obtaining signals for adjusting individual current of each LED unit of the plurality of LED units in the backlight; and
adjusting respective current of each LED unit in the backlight according to the obtained signal;
wherein the step of obtaining signals for adjusting the individual current of each LED unit in the backlight comprises:
obtaining current differences among LED units in the backlight;
generating voltage adjusting signals for each LED unit according to the current difference; and
the step of adjusting respective current of each LED unit in the backlight according to the obtained signal comprises adjusting voltage of each LED unit according to the voltage adjusting signals, respectively.