| 摘要 |
Provided are an optical sheet having excellent thermal resistance, moisture resistance, thermal dimensional stability and weather resistance, without bending or yellowing even upon irradiation, and a backlight unit with reduction in non-uniformity of brightness and lowering of the brightness using such optical sheet. The optical sheet(1) comprises a transparent substrate layer(2), and an optical layer(3) overlaid to a surface side of the substrate layer(2), wherein the optical layer comprises a binder(4), the binder(4) is formed from a polymer composition comprising a copolymer and a fine inorganic filler, and the copolymer comprises at least one of a repeating unit derived from a (meth)acrylic ester having a cycloalkyl group, a repeating unit derived from an iso-butyl (meth)acrylate or a repeating unit derived from a tert-butyl (meth)acrylate. The backlight unit comprises such optical sheet, for use in a liquid crystal display device in which rays of light are diffused to lead onto the surface side.
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