Patent ID: 7554625

Claim:
A display device comprising: a liquid crystal display panel which includes electrodes for forming pixels on an inner surface thereof and interposes a liquid crystal layer between a pair of transparent substrates; and a backlight device which includes: an optical compensation sheet stacked body which is mounted on a back surface of the liquid crystal display panel; a light reflection plate which includes a light reflection surface; and a plurality of solid-state light emitting element units capable of emitting lights of at least three colors mounted on the light reflection surface of the light reflection plate; wherein each of the plurality of solid-state light emitting element units includes an outer surface of a light-transmitting cylindrical light guide body; and wherein air is filled inside of the light-transmitting cylindrical light guide body of the solid-state light emitting unit and outside of the light-transmitting cylindrical light guide body so that the air is also provided between the light-transmitting cylindrical light guide bodies of the plurality of solid-state light emitting units.