Patent ID: 7553056

Claim:
A backlight unit, comprising: a plurality of light-emitting lamps arranged substantially in parallel, wherein the light-emitting lamps are cold cathode fluorescent lamps (CCFLs) or external electrode fluorescent lamps (EEFLs); an outer case that fixes and supports the light-emitting lamps; and a reflection sheet disposed within the outer case and containing a fluorescent material that converts ultraviolet light into visible light and reflects the visible light, wherein the fluorescent material is at least one compound selected from ZnS:CuAl, ZnS:Ag; light scattering means including a plurality of diffusion sheets and a diffusion plate arranged between the light-emitting lamps and a liquid crystal panel; wherein the reflection sheet includes a polyethylene terephthalate (PET) layer, a pressure-sensitive adhesive layer, and a polyester layer sequentially laminated on a colored layer; wherein the polyester layer is a material selected from polycarbonates and polymethylmethacrylates; wherein the fluorescent material converts ultraviolet light having a wavelength in a range of about 310 nm to 380 nm; wherein the fluorescent material is deposited or coated on a surface of the polyester layer which is adjacent to the lamps.