Patent ID: 7188988

Claim:
A liquid crystal display device which includes a liquid crystal display panel which is constituted by sandwiching a liquid crystal layer between a pair of transparent substrates having electrodes for forming pixels on inner surfaces thereof and a backlight device which is mounted on a back surface of the liquid crystal display panel, the backlight device comprising: a main light guide body which has a light irradiation surface which irradiates light forwardly by developing the light in plane; a sub light guide body which is arranged on a back surface of the main light guide body, is divided into a first sub light guide body and a second sub light guide body on both end sides by way of a first air layer disposed in the vicinity of a center portion, and forms light incident surfaces on facing end surfaces of the first sub light guide body and the second sub light guide body in the inside of the first air layer; reflectors which are arranged on both end surfaces of the main light guide body and the sub light guide body and optically couple the main light guide body and the sub light guide body; and a solid-state light emitting element board which is mounted in a state that solid-state light emitting elements capable of emitting light of respective colors consisting of R, G, B in the inside of the first air layer of the sub light guide body are arranged at least in a row.