Patent ID: 9739923
Date: 2017-08-22
CPC Classifications: G02B,G02F

Claim:
1. An illumination device, comprising: a light guide plate having a first surface as a light emitting surface, a second surface opposed to the first surface, and a side end surface; and a plurality of light emitting elements aligned in a first direction along the side end surface of the light guide plate, and each of the plurality of light emitting elements has a light emission surface facing the side end surface, a scattering reflection region provided on the second surface, the scattering reflection region having a plurality of groove arrays, each of the groove arrays includes a plurality of grooves linearly extending in a second direction intersecting the first direction in in-plane directions, a frame which holds the illumination device, the frame having an upper plate portion and a protruding plate portion, both the upper plate portion and the protruding portion extending over an upper surface of the light guide plate, the upper plate portion having a first thickness greater than a second thickness of the protruding portion, an optical sheet disposed on the upper surface of the light guide plate, the upper plate portion and the protruding portion both being in contact with the optical sheet, each of the plurality of grooves being positioned apart from each other in the second direction, the plurality of groove arrays being arranged in a parallel manner in the first direction, and no grooves are disposed between the side end surface and the scattering reflection region on the second surface, an edge of the scattering reflection region is disposed between the side end surface and the protruding plate portion in plan view, and the protruding plate portion includes a first protruding plate portion, a second protruding plate portion, and a third protruding plate portion, the second protruding plate portion disposed between the first protruding plate portion and the third protruding plate portion, and the second protruding plate portion having a second protruding plate portion thickness less than a thickness of the first protruding plate portion or a thickness of the third protruding plate portion.