US Patent 7504050 - Nanoparticle enhanced electrophoretic display

http://www.freepatentsonline.com/7504050.html

Electrophoretic displays are one of the principle technology used to create electronic paper having the appearance and flexibility similar to paper. This patent from Sipix Imaging teaches a nanoparticle filler providing improved transparency and reduced wear of the displays. Claim 9 reads:

9. An electrophoretic display which comprises

a) microcups formed from a composition comprising a microcup forming material and a conductive filler in the form of nanoparticles and having a volume resistivity of less than about 10000 ohm cm; and

b) an electrophoretic fluid filled in the microcups wherein said electrophoretic fluid comprises charged pigment particles dispersed in a solvent.