Fabrication of integrated light guiding plate for backlight system

Abstract

A traditional LCD backlight system is consist of light sources, a light guiding plate and prism sheets, diffusive sheets and reflective sheet. Following the development of the thin LCD, modify the backlight system which has already become the trend. The light guiding plate is very important element in backlight unit which is usually made of Polymethyl methacrylate (PMMA). Generally, the light guiding plates is fabricated by injection molding. MEMS and hot embossing technologies are applied to fabricate the integrated light guiding plate in this research. The micro-prisms, the micro pyramids and Al thin film are based on the integrated light guiding plate which is guiding light to the LCD panel evenly. So the backlight system will be simplified to use only one integrated light guiding plate without using any optical sheets. The light guiding plate can reduce three optical sheets in backlight, so it can save the space and lower the process cost. Non-prism LGPs and integrated LGPs are presented in this paper.