As the demand for low electricity-consuming and environment-friendly green
industry is increasing recently, active is the development of technology for LED BLU
as an LCD luminous source to replace existing mercurial CCFL, which features the
excellent color representation, high reliability, prompt response, and low electricity
consumption. In addition to such basic features of LED, methods to reduce the electric
consumption of BLU are being developed to control the power output of the switching
converter with the optimal voltage necessary for the LED unit [1, 2].