Backlight system having a lamp current balance and feedback mechanism and related method thereof

A backlight system comprising:

• a first lamp comprising a first end and a second end;
• a first transformer comprising a first winding and a second winding, a first end of the first winding of the first transformer being coupled to the first end of the first lamp;
• a second transformer comprising a first winding and a second winding, a first end of the first winding of the second transformer being coupled to the second end of the first lamp, a first end of the second winding of the second transformer being coupled to a first end of the second winding of the first transformer, a second end of the second winding of the second transformer being coupled to a second end of the second winding of the first transformer;
• a third transformer comprising a first winding and a second winding, a first end of the second winding of the third transformer being coupled to a second end of the first winding of the first transformer, a second end of the second winding of the third transformer being coupled to a ground;
• a fourth transformer comprising a first winding and a second winding, a first end of the second winding of the fourth transformer being coupled to a second end of the first winding of the second transformer, a second end of the second winding of the fourth transformer being coupled to the ground;
• and
• a driving circuit, coupled to the first winding of the third transformer and the first winding of the fourth transformer, for generating a first driving voltage and a second driving voltage having opposite phase with each other;
• wherein the first driving voltage is furnished to the first winding of the third transformer and the second driving voltage is furnished to the first winding of the fourth transformer.