Patent ID: 7741790

Claim:
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.