US Patent 7892638 - Brightness enhancing nanoparticle film

http://www.freepatentsonline.com/7892638.html

This patent from 3M is related to scratch resistant films used for liquid crystal displays. Claim 1 reads:

1. A brightness enhancing film comprising:

a brightness enhancing polymerized structure having a plurality of surface modified colloidal nanoparticles;

further comprising a base layer optically coupled to the polymerized structure;

wherein the base layer is useful as a polarizing material.