Patent ID: 9645294
Date: 2017-05-09
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 surface; a plurality of light emitting elements aligned in a first direction along the side surface of the light guide plate, and each of the plurality of light emitting elements has a light emission surface facing the side 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, 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, the plurality of grooves being configured with a shape to scatter light from the light emitting elements in different directions; a frame which holds the light guide plate, the frame supporting a part of the side surface and at least a peripheral region of the first surface, the frame including 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, and an edge of the scattering reflection region is disposed between the side end surface and the protruding plate portion in plan view, wherein no grooves are disposed between the side surface and the scattering reflection region on the second surface.