Liquid crystal Display (LCD) panels are used in various applications ranging from smaller
portable electronic equipment to larger fixed location units. Applications include digital
cameras, notebook computers, PDAs, tablet PCs and industrial instrumentation products.
The LCD panel itself cannot emit light. Therefore, a backlight system that supplies the
light from behind is normally required. Currently, the most commonly used light emitting
device is a fluorescent tube called CCFL.
The CCFLs (Cold Cathode Fluorescent Lamps) are driven by a DC to AC inverter, which
generally provides a wide range of DC input voltage and transforms the voltage into an
AC high voltage and high frequency output to run the lamp. Many applications also
require efficient dimming capabilities to allow the lamp output to match ambient light
conditions and thus increase both lamp and battery life.