Patent ID: 8049837

Claim:
A backlight unit comprising: a light source; and a multilayer film disposed adjacent to the light source, wherein the multilayer film comprises at least one first layer including a plurality of first particles and at least one second layer including a plurality of second particles, and wherein the second layer is disposed adjacent to the first layer and has a refractive index that is higher than a refractive index of the first layer, wherein the first and second layers are accumulated alternately and repeatedly, wherein at least one adhesive layer is disposed between the first layer and the second layer, the adhesive layer having a thickness that is less than a thickness of the first layer and the second layer, wherein the first layer includes first binders and the second layer includes second binders, wherein the first binder and the second binder have different refractive indices, and wherein the first and second particles are beads having substantially a same size in the first and second layers.