公开(公告)号：US20230367156A1

公开(公告)日：2023-11-16

申请号：US18195917

申请日：2023-05-10

Applicant: Sharp Display Technology Corporation

Inventor： Yuichi KAWAHIRA ,  Masahiro HASEGAWA ,  Ryosuke SAIGUSA ,  Akira SAKAI

IPC: G02F1/1335 ,  G02F1/13363 ,  G06F1/16

CPC classification number: G02F1/133528 ,  G02F1/13363 ,  G06F1/163 ,  G02F2413/01 ,  G02F2413/02 ,  G02F2413/08 ,  G02F2413/12 ,  G02F2413/06

Abstract: Provided is a liquid crystal display device having high luminance and high CR in a front direction and especially useful as a head-mounted liquid crystal display device, for example. The liquid crystal display device includes: a liquid crystal panel; an optical element; and a backlight, arranged in this order from a viewing surface side. The optical element includes a first polarizer, a retardation layer, and a second polarizer. The first polarizer, the retardation layer, and the second polarizer are arranged in this order from the viewing surface side. The first polarizer and the second polarizer are reflection polarizers. A reflection axis of the first polarizer and a reflection axis of the second polarizer are parallel to each other. In oblique directions at azimuths of 0°, 45°, and 90° at a polar angle of 60°, a polarization state of light incident on the first polarizer is elliptical polarization.

公开(公告)号：US20230077158A1

公开(公告)日：2023-03-09

申请号：US17893313

申请日：2022-08-23

Applicant: Sharp Display Technology Corporation

Inventor： Akira SAKAI ,  Yuichi KAWAHIRA ,  Masahiro HASEGAWA ,  Ryosuke SAIGUSA

IPC: G02F1/1335 ,  G02F1/13363

Abstract: An optical element includes, sequentially from a viewing surface side toward a back surface side: a viewing-surface-side polarizer; a retarder; and a back-surface-side polarizer, a transmission axis of the viewing-surface-side polarizer and a transmission axis of the back-surface-side polarizer being parallel to each other, the optical element having an average angle θ between an angle θ1 and an angle θ2 of greater than 0° and smaller than 90°, wherein the angle θ1 represents an angle formed by an optical axis of the retarder on a surface close to the back surface with the surface close to the back surface; and the angle θ2 represents an angle formed by an optical axis of the retarder on a surface close to the viewing surface with the surface close to the viewing surface.