US 11,927,775 B2
3D glasses, optical device, and three-dimensional image display device
Masahiro Hasegawa, Kameyama (JP); Akira Sakai, Kameyama (JP); and Kiyoshi Minoura, Kameyama (JP)
Assigned to Sharp Display Technology Corporation, Kameyama (JP)
Filed by Sharp Display Technology Corporation, Mie (JP)
Filed on Apr. 13, 2023, as Appl. No. 18/134,504.
Claims priority of application No. 2022-067728 (JP), filed on Apr. 15, 2022.
Prior Publication US 2023/0333402 A1, Oct. 19, 2023
Int. Cl. G02B 30/24 (2020.01); G02B 30/25 (2020.01); G02F 1/1335 (2006.01); G02F 1/13363 (2006.01); G02F 1/1347 (2006.01); G02C 11/00 (2006.01)
CPC G02B 30/24 (2020.01) [G02B 30/25 (2020.01); G02F 1/133528 (2013.01); G02F 1/133634 (2013.01); G02F 1/133638 (2021.01); G02F 1/1347 (2013.01); G02C 11/10 (2013.01); G02F 2413/04 (2013.01); G02F 2413/13 (2013.01); G02F 2413/14 (2013.01)] 8 Claims
OG exemplary drawing
 
1. 3D glasses comprising:
a right-eye polarizer; and
a left-eye polarizer,
the right-eye polarizer and the left-eye polarizer each comprising a polarizing plate and a first λ/4 plate,
at least one of the right-eye polarizer or the left-eye polarizer comprising a phase difference layer on or behind a back surface side of the polarizing plate,
wherein the phase difference layer is a positive C plate or a negative C plate providing a phase difference of 5 nm or less in an in-plane direction, and
a phase difference introduced by the right-eye polarizer in a thickness direction at a wavelength of 550 nm is different from a phase difference introduced by the left-eye polarizer in the thickness direction at a wavelength of 550 nm.