In-Plane Switching (IPS) mode, one of the widely used LC modes in the LCD-TV applications, has merits in the electro-optic characteristics such as viewing angle and moving picture quality. However, it has also been pointed out to have low contrast ratio and not good enough in the black image quality. In this paper, we elucidate what the main factors of the low contrast ratio of IPS mode are and how to improve this black issue. Firstly, we have studied the range of black luminance perceivable by human eyes, and defined the required black luminance under the various ambient light conditions. In addition, we have developed the specific IPS technologies in order to meet the required black reference in all viewing angle directions.
展开▼
