Patent ID: 8864361

Claim:
A display device, comprising: a display panel; and a backlight unit to be used as a planar light source of the display panel, wherein the backlight unit comprises: a light source having an emission region narrower than an emission region of the planar light source; a wiring board having the light source mounted thereon; a light guide plate having an end surface into which light from the light source enters, and a front surface from which the light exits; a light-shielding pressure-sensitive adhesive sheet for causing the wiring board to adhere to an end portion of the front surface of the light guide plate; and a light diffusion sheet which overlaps with the front surface of the light guide plate, wherein the front surface of the light guide plate comprises an effective region serving as the planar light source and a light entering region ranging from the end surface into which the light enters to the effective region, wherein the wiring board and the light-shielding pressure-sensitive adhesive sheet each have a part positioned in the light entering region, wherein the light diffusion sheet is arranged from the effective region to the light entering region, and at least an end portion thereof overlaps with the light-shielding pressure-sensitive adhesive sheet in the light entering region, and wherein on a side closer to the effective region with respect to the light-shielding pressure-sensitive adhesive sheet, the light entering region is covered with the light diffusion sheet without a gap.