Cost effective design and implementation of scanning-based LED backlight for LCD module

Blurring effects in liquid crystal display can be observed in motion pictures if the response time of the liquid crystal molecules is not fast enough. In this study, a cost-effective architecture for backlight control system is proposed with scanning based method. A backlight control process employed with sequential lighting of the backlit pixels to reduce the blurring effects on LCD. Based on the sequential control, a 42-inch white light backlight module system with 1440 LED devices can be driven by only two driver chips. The prototyping backlight system had been implemented within one PCB in success. The measurement results from the laboratory demonstrate that the backlight system can save power dissipation and provide enough brightness for LCD. The proposed backlight system can be not only to reduce the implementation cost but also to shrink the driving broad size. The implementation cost can be reduced by about 70% compared with the conventional architecture.