%0 Journal Article %T A study of optical design of backlight module with external illuminance %A Yen, Chih-Ta %A Fang, Yi-Chin %J Proceedings of SPIE %V 8170 %N 1 %P 81700K-81700K-17 %@ 0277-786X %D 2011-09-22 %I SPIE %~ DeepDyve