Applications of Multidirectional Asymmetrical Microlens-Array Light-Control Films on Reflective Liquid-Crystal Displays for Image Quality Enhancement

Yi-Pai Huang, Han-Ping David Shieh, Shin-Tson Wu
2004 Applied Optics  
The multidirectional asymmetrical microlens-array light-control film ͑MAMA-LCF͒ is developed for enhancing the image brightness and contrast ratio of various reflective liquid-crystal displays. By use of index-matching material, the interface reflection is greatly reduced. Through optimized designs, the surface-scattering effect is also suppressed; thus the contrast ratio is much enhanced. From experimental results, the MAMA-LCF leads to a ϳ1.5ϫ gain in brightness over the MgO standard white
more » ... O standard white and a 15:1 contrast ratio for the reflective color super-twist nematic liquid-crystal display, 2.8ϫ MgO and a 23:1 contrast ratio for the polymer-dispersed liquid-crystal, and 2.8ϫ MgO and a 13:1 contrast ratio for the cholesteric liquid-crystal display. Potential applications of this low-cost plastic thin film for reflective liquid-crystal displays are foreseeable.
doi:10.1364/ao.43.003656 pmid:15218605 fatcat:44gxsdcoovgfncfsa7sn5e6htq