Light diffuser plate with light-collecting layer

Abstract

There is provided a light diffuser plate with a light-collecting layer which can be sufficiently prevented from flawing and which can ensure a sufficient luminance in the front direction. Such a light diffuser plate with a light-collecting layer comprises a light-collecting sheet 41, and a light-diffusing substrate 31 having an uneven surface 34 at its one side, said uneven surface 34 having a plurality of protrusions 32 formed thereon, and flat portions 33 with lengths of 5 μm or more, each formed between the adjacent protrusions 32, and is characterized in that said light-diffusing substrate 31 and said light-collecting sheet 41 are laminated on each other by jointing the protrusions 32 of the uneven surface of said light-diffusing substrate 31 to one surface of said light-collecting sheet 41 through an adhesive layer 40; air layers 42 are formed between the adhesive layer 40 and the flat portions 33 of the uneven surface of said light-diffusing substrate 31; and the total contact area of the protrusions 32 and the adhesive layer 40 is set at from 1 to 25% of the laminated area of said light-diffusing substrate 31 and said light-collecting sheet 41.

Dependencies are inferred from the claim text.