Liquid crystal display including a control member for providing a transparent visual range within a predetermined viewing angle and an opaque visual range outside the predetermined viewing angle

摘要

In an lighting device, light rays, which have been illuminated from a discharge tube onto a light-guiding body and have been released from a light-emitting surface of the light-guiding body, are converged toward the normal direction by prisms each of which has a triangle- column shape and is installed on a light-converging control plate. A visual-range control plate provides a transparent visual range with a predetermined viewing angle with respect to the normal direction, while providing an opaque visual range outside the predetermined viewing angle with respect to the normal direction. This arrangement makes it possible to improve the surface luminance of the lighting device and prevent the degradation of the display quality. Thus, it is possible to achieve high- luminance, high quality lighting devices.