Patent ID: 8157430

Claim:
A backlight device comprising: a light guide plate; and a plurality of point light sources mounted on a flexible printed circuit board disposed near a side surface of the light guide plate, wherein a point light source comprises a semiconductor light emitting device, a metal slug fitted with the semiconductor device, and an electrode terminal, part of the metal slug being exposed at a mounting surface side, the flexible printed circuit board comprises a mounting conductor connected to the electrode terminal of a point light source, and a heat dissipation conductor corresponding to a point light source and separated from an adjacent heat dissipation conductor so as not to conduct to one another, the electrode terminal of a point light source and a mounting conductor of the flexible printed circuit board are bonded together with a conductive adhesive, and the metal slug of a point light source and a heat dissipation conductor of the flexible printed circuit board are bonded together with the same conductive adhesive.