Patent ID: 8345183

Claim:
A backlight unit, comprising: a light emitting arrangement adapted to radiate light, the light emitting arrangement includes: a rear substrate, a plurality of emitters arranged on the rear substrate and adapted to radiate an electron beam, a transparent front substrate arranged to face the rear substrate and a fluorescent layer arranged on a lower surface of the front substrate and facing with the rear substrate, wherein the light shielding guides are arranged on an upper surface of the front substrate; and a plurality of light shielding guides adapted to divide the light emitting arrangement into a plurality of unit blocks, the unit blocks being adapted to provide local dimming, the light shielding guides being further adapted to prevent light from traveling from one of said unit blocks to another of said unit blocks, wherein the light shielding guides are arranged in a tetragonal lattice arrangement on an entire upper surface of the front substrate, wherein the light shielding guides are further adapted to radiate heat generated by the light emitting arrangement by having a high thermal conductivity.