Patent ID: 8807818

Claim:
A backlight device, comprising: a light guide plate; and a plurality of light source units, placed side by side at placement intervals of P 2 in a direction extending along an end face of the light guide plate, the plurality of light source units being spaced apart from the end face of the light guide plate by a distance H, wherein each of the plurality of light source units includes: a plurality of light-emitting units placed side by side at placement intervals of P 1 in the direction extending therealong and configured by stacking a phosphor layer exited by blue light on a light-emitting face of a semiconductor light-emitting element configured to emit blue light; and a package section, on which the plurality of light-emitting units are fixed, having a pair of inclined portions provided at both ends in the direction extending therealong, wherein the pair of inclined portions reflect white light radiated from the plurality of light-emitting units so as to be guided to the end face thereof, and the height of the inclined portion is greater than that of the plurality of light-emitting units, and wherein the light guide plate is so arranged as to meet a condition that P 1 ≦H≦P 2 .