38.3: Dual Light Source for Backlight Systems for Smart Viewing-Adjustable LCDs

A dual light source of backlight systems was proposed to obtain an adjustable viewing angle of LCDs. A top lightguide plate (LGP-T) in combination with a reverse prism sheet was utilized to redirect the emitting rays towards restricted normal viewing cones while a bottom lightguide plate (LGP-B) towards wide viewing cones. Adjustable viewing angles could be easily switched between 60 ° and 140 ° according to personal preference. Luminous uniformity of 81% and 72% was acquired for narrow and wide viewing modes, respectively. In addition, a cost benefit of super high brightness could be easily achieved when adopt the dual light source of backlight system module.