Patent ID: 7042171
Filing Date: 2006-05-09
Classification: H05B,Y10S

Abstract:
1. A multiple-CCFL parallel driving circuit for a LCD, comprising: a plurality of sets of CCFLs, providing a backlight for a LCD; a boosting transformer with a plurality of sets of outputs, providing a driving voltage and current for driving the plurality of sets of CCFLs; a plurality of ballast capacitors, the ballast capacitors are connected between the boosting transformer and the CCFLs; and a multiple-CCFL current balancing circuit, the multiple-CCFL current balancing circuit is a current mirror circuit comprised of a plurality of bipolar junction transistors and equalizes driving current of the plurality of sets of CCFLs, the reference of the current mirror circuit is connected to output of the first CCFL of the plurality sets of CCFLs in order to equalize the driving current of the second CCFL, the third CCFL and the fourth CCFL.