A Study of Integrated Optical Design and Optimization for LED Backlight Module With Prism Patterns

In backlight modules, the light guide plate (LGP) is a key component for performance and also facilitates access to develop LGPs on their own. In this research, we propose a newly developed method: LEDs with freeform secondary optical lens as a lighting source are employed to integrate and manipulate the specially designed and optimized 3D-like pattern distribution of the micro features to obtain the required optical characteristics at maximal performance. In this research, a LGP of 3.5 inch dimensions as an example of such an integral optical design and optimization of LGPs is expected not only to remove optical films but also reduce the thickness of the backlight module and increase overall brightness and uniformity. After integral optical design, optimization extended by the Taguchi with principal component analysis method improved the brightness by up to 98%, reduced the thickness by 10% and improved the uniformity by 62.5%.