Patent ID: 8913207

Claim:
A display device, comprising: a display panel for displaying an image; a light guide plate, which is arranged on a back surface side of the display panel, and has one flat surface as a light emitting surface to allow light of a light source entering from an end surface of the light guide plate to be emitted; an optical sheet, which is arranged on the light emitting surface side of the light guide plate; a frame formed into a box shape with one open surface, for holding the light guide plate and the optical sheet, the frame having a planar shape of a quadrangle having a pair of short sides and a pair of long sides, and including side walls along the quadrangle, the side walls including a first angled corner portion and a second angled corner portion, the first angled corner portion and the second angled corner portion being respectively positioned at both end portions of one side selected from the pair of short sides and the pair of long sides; a first protrusion formed inside the first angled corner portion on one of the pair of short sides; a second protrusion formed inside the first angled corner portion on one of the pair of long sides; and a third protrusion formed inside the second angled corner portion on a side different from the one side selected from the pair of short sides and the pair of long sides; wherein the optical sheet includes a cut-out first recess, a cut-out second recess, and a cut-out third recess, which are to be fitted to the first protrusion, the second protrusion, and the third protrusion, respectively; wherein the first protrusion and the second protrusion are formed on a first locking member having an L-shape, and the third protrusion is formed on a second locking member having an L-shape; wherein the first locking member and the second locking member each include a flat portion that is flush with the light guide plate; and wherein the first protrusion and the second protrusion, and the third protrusion are formed to protrude from the flat portion.