LIGHT GUIDE DEVICE AND DISPLAY DEVICE

摘要

A light guide device (40) comprises an LED group (13) as a light source, a light guide plate (41) for color mixing, a light guide plate (42) having a light output face, a triangular prism (12) for guiding light rays from the LED group (13) to one end face of the light guide plate (41), and triangular prisms (12A, 12B) for guiding light rays from the other end face of the light guide plate (41) to one end face of the light guide plate (42). The light guide device (40) as backlight is provided behind a liquid crystal display panel (92), and gas layers are interposed between each of the optical members of the individual light guide plates (41, 42) and triangular prisms (12A, 12B). This enables to reduce irregularity in luminance and color when plural light sources are used and to efficiently change the traveling direction of the light.