Patent ID: 7857471

Claim:
An optical sheet comprising: a first lens sheet having a plurality of first three-dimensional structures arrayed to extend along a first direction on a light-emitting surface thereof; a reflective polarizer sheet for transmitting either one of p-polarization component and s-polarization component of incident light and reflecting the other of p-polarization component and s-polarization component of the incident light, a bonding layer; a second lens sheet having a plurality of second three-dimensional structures arrayed to extend along a second direction on a first surface thereof, the second direction intersecting with the first direction of the first three-dimensional structure; wherein head portions of the first three-dimensional structures are bonded to the reflective polarizer sheet through the bonding layer; each of the first three-dimensional structures arrayed in the first direction has a width of not less than 110 μm and not more that 330 μm; each of the first three-dimensional structures arrayed in the first direction has a bonding width of not more that 20% of the width of the arrayed direction of the first three-dimensional structures; and wherein a second surface of the second lens sheet is bonded to the reflective polarizer sheet on a surface of the reflective polarizer that is opposite to the surface of the reflective polarizer to which the first lens sheet is bonded.