Patent ID: 8596853

Claim:
A backlight, comprising: a first light guide plate which emits a light inputted from an end face thereof from a main surface thereof; a second light guide plate which includes an end face for an incoming light and an end face for an emitting light, and which is arranged behind said first light guide plate; a light source which is arranged near said end face for an incoming light of said second light guide plate; a reflection sheet which is arranged between said first light guide plate and said second light guide plate; a chassis which houses said first light guide plate, said second light guide plate and said reflection sheet; a rear cover which fixes said first light guide plate, said second light guide plate and said reflection sheet with said chassis, wherein said first light guide plate and said second light guide plate are positioned in a thickness direction thereof, wherein the first light guide plate and the second light guide plate are sandwiched by the chassis and the rear cover at respective positions thereof; and a reflector optically connecting i) the end face for the emitting light of the second light guide to ii) the inputted light end face of the first light guide, wherein a layer of air exists between said first light guide plate and said second light guide plate, and wherein said first light guide plate includes one or more first projection parts, wherein said second light guide plate includes one or more second projection parts at a position which is different from a position of said first projection part, and wherein said chassis includes a first concave part at a position facing said first projection part and includes a second concave part at a position facing said second projection part.