Optical film with microstructures array for slim-type backlight applications

A novel optical film with optical microstructures is proposed for enhancing the light control in slim-type backlight modules. The proposed film enables a homogeneous luminance distribution to be obtained though an appropriate adjustment of the filling ratio of the optical microstructures in different regions of the backlight unit. The simulation results show that the luminance provided by a backlight incorporating a filling-ratio-optimized optical film and a pyramid-structured brightness enhancement film is approximately 1.5 times of the luminance obtained from a backlight with conventional optical films. In addition, the proposed film enables a significant reduction in the thickness of the backlight unit. Thus, the novel optical film is suitable for a slim bottom-lit backlight module.