Apple Qdot patent 9,810,942 Quantum dot-enhanced display having dichroic filter http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9,810,942.PN.&OS=PN/9,810,942&RS=PN/9,810,942