[1] Natl Chiao Tung Univ, Dept Photon, Hsinchu 30010, Taiwan
[2] Natl Chiao Tung Univ, Display Inst, Hsinchu 30010, Taiwan
[3] Natl Chiao Tung Univ, Inst Electroopt Engn, Hsinchu 30010, Taiwan
[4] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan