BEADED CLEAR OPTICAL LAYERS FOR TURNING OR EXTRACTING LIGHT

摘要

Optical films performing the function of turning or extraction are described. More specifically, beaded clear layers having first and second layers of pressure sensitive adhesive and a plurality of microspheres are described. In some embodiments, the thicknesses of the first and second layers of pressure sensitive adhesive and the diameter of the microspheres are selected such that the first and second layers of pressure sensitive adhesive are not in contact. In other embodiments, the index of refraction of the microspheres is selected to reflect light through total internal reflection. Optical films with beaded clear layers and light extraction layers are also described.

主权项

1. An optical film, comprising:
a first layer of pressure sensitive adhesive comprising a first thickness; a second layer of pressure sensitive adhesive comprising a second thickness; and a plurality of microspheres comprising a mean diameter, the plurality of microspheres disposed between and at least partially within each of the first and second layers of pressure sensitive adhesive; wherein the first thickness of the first layer of pressure sensitive adhesive, the second thickness of the second layer of pressure sensitive adhesive, and the mean diameter of the plurality of microspheres have been selected such that the first and second layer of pressure sensitive adhesive are not in contact.