摘要
This study proposes a roll-to-roll process-based sub-wavelength grating, which is attached on a light bar to turn the side-lit red/green/blue (620, 520, and 450 nm) incident rays into a uniformly and normally output white light with high illuminance from the light bar's surface. On the basis of the rigorous coupling wave analysis, the relationship between the firstorder transmission/reflection efficiency and the pitch of the gratings with different shapes was analyzed. The optimal design can effectively reduce the coupling length and enhance the white color balance for display applications. © Copyright 2013 Society for Information Display.