COEXTRUDED OPTICAL SHEET

摘要

A coextruded optical sheet includes layers of materials having different optical properties. The materials vary in relative amounts in a transverse direction of the optical sheet, orthogonal to a machine direction in which the optical sheet is extruded. The different optical properties are due to different concentrations of light-redirecting elements in the materials, for example, by using light-redirecting elements, such as light-redirecting particles, in one of the materials and not in the other of the materials. The optical sheet may be coextruded from a suitable extrusion die, from supplies of the materials.