Patent ID: 8441428

Claim:
A power supply for a liquid crystal display, comprising: a power conversion section converting commercial AC power into at least one operating power having a predetermined voltage level through a switching operation; a backlight driving section switching the operating power from the power conversion section into backlight driving power; and a power switching control section controlling the switching operation of the power conversion section on the basis of a first feedback signal having a voltage level of the operating power from the power conversion section and a second feedback signal having a voltage level of the backlight driving power from the backlight driving section, wherein the power conversion section, the backlight driving section and the power switching control section are mounted on a single printed circuit board; wherein the power conversion section comprises: a rectifier rectifying and smoothing the commercial AC power; a switching unit switching the power rectified and smoothed by the rectifier; and a transformation unit transforming a voltage level of the power switched by the switching unit to supply the operating power; and wherein the transformation unit comprises: a primary winding receiving the power switched by the switching unit; a first secondary winding forming a predetermined first turns ratio relative to the primary winding to output first operating power; and a second secondary winding forming a predetermined second turns ratio relative to the primary winding to output second operating power.