公开(公告)号：US20190293880A1

公开(公告)日：2019-09-26

申请号：US16437494

申请日：2019-06-11

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Seiji NISHIWAKI ,  Tohru NAKAGAWA ,  Tsuyoshi YAMAMOTO

IPC: G02B6/42 ,  G02B19/00 ,  H01L31/054

Abstract: A waveguide sheet captures incident light and waveguides the incident light in a direction intersecting with an incident direction. The waveguide sheet includes a diffraction grating layer that changes a traveling direction of the incident light and a plurality of first light-transmissive pairs. Each of the first light-transmissive pairs includes a first light-transmissive layer having a shape with first concave streaks and first convex streaks being repeatedly arranged in a first direction that is a direction intersecting with the incident direction, and a second light-transmissive layer laminated on the first light-transmissive layer. In the plurality of first light-transmissive pairs, the first light-transmissive layer is located closer to a side of the diffraction grating layer and each of the first concave streaks of another first light-transmissive layer is located between adjacent first convex streaks among the first convex streaks of the first light-transmissive layer as seen in the incident direction.