Multi‐primary‐color LCD: Its characteristics and extended applications

— The development of multi-primary-color (MPC) display systems is one of the big paradigm shifts in recent display technologies and induces new potentials of display devices. The development of MPC display systems for different goals is briefly reviewed. Especially, by employing MPC systems, it is possible to reproduce the real material colors faithfully and efficiently. For signal processing, MPC systems have a big advantage in the so-called color-reproduction redundancy. A number of applications can be derived from this characteristic, such as improving the viewing-angle dependency issue and power savings. On the other hand, MPC systems have a typical trade-off versus RGB-standardized input signals, especially for reproducing bright green. New algorithms to moderate this trade-off on MPC systems by employing color-reproduction redundancy are proposed. The goal of our algorithms is to maintain the compatibility with RGB-based input signals though the initial display design so that the characteristics of MPC systems are not changed or lost. These algorithms indicate that MPC display systems are applicable not only for a specifically limited objective but also for other applications, e.g., TV broadcasting.