公开(公告)号：US20240052207A1

公开(公告)日：2024-02-15

申请号：US18274097

申请日：2022-02-04

Applicant: NITTO DENKO CORPORATION

Inventor： Shunya WAKAYAMA ,  Shigeyoshi KIRIBE ,  Naoyuki MATSUO

IPC: C09J7/35 ,  C09J5/06 ,  B32B27/30 ,  B32B3/30 ,  B32B27/08 ,  B32B7/12 ,  B32B27/36 ,  B32B37/12

CPC classification number: C09J7/35 ,  C09J5/06 ,  B32B27/308 ,  B32B3/30 ,  B32B27/08 ,  B32B7/12 ,  B32B27/36 ,  B32B37/1284 ,  C09J2301/304 ,  C09J2433/00 ,  C09J2467/00 ,  G02B6/0053

Abstract: An optical stack includes: a first optical sheet having a first principal face with a concavo-convex structure and a second principal face at an opposite side from the first principal face; and an adhesive layer that is disposed on the first principal face of the first optical sheet. The concavo-convex structure includes a plurality of dents and flat portions between adjacent ones of the plurality of dents. The adhesive layer is in contact with the flat portions. A surface of the adhesive layer and the first principal face of the first optical sheet together define an internal space within each of the plurality of dents. In a plan view from a normal direction of the first principal face of the first optical sheet, an area ratio of air voids existing at interfaces between the flat portions and the adhesive layer to an area of the first optical sheet is 3% or less.