can anyone explain exactly what's a backlight?
A
liquid crystal display (LCD) panel produces no light of its own, so it has to have a light source to be visible. You can either have a display that uses ambient light (
reflective, for example the original
GameBoy) or one that is lit from behind (
transmissive, like most laptops and cell phones). Lit from behind, hence "backlight." Most current laptops and desktop LCDs use fluorescent lamps running on a relatively high voltage using a high-frequency switching inverter; the DC supply is fed to an oscillator which in turn feeds a transformer to drive the lamp tube.
A flourescent lamp has an advantage over LEDs in efficiency and over an
electroluminescent (EL) light source in color. Also, a display-sized white EL source is difficult and expensive to fabricate, which is why the tube lamp is still the most-used light source 15+ years after the introduction of the laptop. LEDs are making inroads, though. As
ultraviolet LEDs become cheaper, brighter, and more efficient, they will even replace light bulbs in our homes, but may never fully replace fluorescent tubes in laptops.
Unsolved 
Offline 
I need that off, whatever it is!! This is really important... it doesnt turn black if Im using the laptop... moving mouse around and keys.... 
