Patent ID: 9720162
Date: 2017-08-01
CPC Classifications: G02B,G02F

Claim:
1. A backlight device, comprising: a light source; a light guide plate that receives light emitted by the light source and outputs light upward from a top surface of the light guide; a plurality of stacked optical sheets over the light guide, receiving the light outputted from the light guide plate, each of the optical sheets having a planar shape; and a frame member that fixes the plurality of optical sheets in place, wherein each of the plurality of optical sheets is provided with a protrusion in a portion of an edge of each of the optical sheets, the protrusion protruding out from one side of the optical sheet in a direction parallel to a surface of each of the optical sheets, wherein the protrusion provided in each of the plurality of optical sheets has: a first region that is directly connected to each of the optical sheets and that does not overlap a protrusion of another optical sheet; and a second region that is connected to each of the optical sheets through the first region and that overlaps the protrusion of said another optical sheet at least in part, and wherein at least a portion of the first region is not mounted on the frame member, and at least a portion of the second region is mounted on the frame member.