公开(公告)号：US11415729B2

公开(公告)日：2022-08-16

申请号：US16586978

申请日：2019-09-28

Applicant: KOREA PHOTONICS TECHNOLOGY INSTITUTE

Inventor： Seonkyu Yoon ,  Dongkil Lee ,  Kwanghoon Lee ,  Yanggyu Kim

IPC: G02B27/14 ,  G02B5/08 ,  G06T7/571 ,  G02B5/30 ,  G02B27/01 ,  G02B27/40 ,  G06F3/01 ,  G06V20/20

Abstract: A multi-focal optical device comprises an image output unit outputting optical information, a linear polarizer uni-directionally polarizing the optical information, a first light reflector including a first polarizer transmitting light only in a first direction and reflecting the light transmitted through the first polarizer, a second light reflector including a second polarizer transmitting light only in a second direction perpendicular to the first direction and reflecting the light transmitted through the second polarizer, a light splitter splitting the optical information transmitted through the linear polarizer into the first light reflector and the second light reflector and reflecting the optical information reflected by one of the first light reflector or the second light reflector to allow the reflected optical information to form one focus, and a controller configured to control the linear polarizer to vary a direction of polarization of the linear polarizer.