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公开(公告)号：US20240192638A1
公开(公告)日：2024-06-13
申请号：US17904744
申请日：2021-12-30
Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION
Inventor： Byoungho LEE , Dukho LEE , Kiseung BANG , Seung-Woo NAM
CPC classification number: G03H1/2202 , G03H1/0443 , G03H1/0486 , G03H1/0808 , G03H1/12 , G03H2001/045 , G03H2001/0833 , G03H2001/2239
Abstract: A holographic display apparatus and a hologram optimization method for the apparatus are provided. The holographic display apparatus includes a focus-forming optical element configured to form a plurality of foci by receiving plane waves; a collimating lens configured to propagate, as plane waves, light incident through the plurality of foci; and a spatial light modulator configured to generate a holographic image by overlapping a plurality of plane waves incident from the collimating lens.
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2.发明公开公开(公告)号：US20240288608A1
公开(公告)日：2024-08-29
申请号：US18654937
申请日：2024-05-03
Inventor： Jeonggeun YUN , Byoungho LEE , Chulsoo CHOI , Kyookeun LEE , Taewon CHOI
CPC classification number: G02B1/002 , G02B27/0172 , G02B2027/0132
Abstract: An atypical metasurface, includes: a 2-dimensional plane; and a plurality of atypical unit structures periodically arranged on the 2-dimensional plane, wherein each of the plurality of atypical unit structures has an atypical pattern that is not periodic.
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公开(公告)号：US20200264441A1
公开(公告)日：2020-08-20
申请号：US16683643
申请日：2019-11-14
Inventor： Changkun LEE , Seokil MOON , Byoungho LEE , Sunil KIM , Bongsu SHIN , Hongseok LEE
Abstract: Provided is a multi-image display apparatus including a light source configured to emit a first wavelength light, a second wavelength light, and a third wavelength light, a spatial light modulator configured to modulate the first wavelength light, the second wavelength light, and the third wavelength light to form a first image including a first color holographic image, a second color holographic image, and a third color holographic image, a polarization selective lens configured to focus the first image having only a first polarization component and transmit a second image having only a second polarization component without refraction, the second image being provided to the polarization selective lens along a different path from the first image, wherein chromatic aberration of the polarization selective lens is offset by adjusting a depth of the first color holographic image, the second color holographic image, and the third color holographic image.
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公开(公告)号：US20250085664A1
公开(公告)日：2025-03-13
申请号：US18725915
申请日：2022-06-28
Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION
Inventor： Byoungho LEE , Byounghyo LEE , Dongyeon KIM , Seungjae LEE , Chun CHEN
Abstract: Provided are a method and apparatus for optimizing a holographic display. The holographic display back-propagates target field data including generating a predicted hologram by a plurality of planes in a depth direction to a complex plane of a space light modulator (SLM), converts the predicted hologram into a binary hologram, generates predicted field data by forward-propagating the binary hologram to a reproduction plane through an optical system simulation model, calculates a loss function between the predicted field data and the target field data, generates a new predicted hologram for the predicted field data by using a stochastic gradient descent (SGD) method to reduce a value of the loss function, and repeats the generation of the new predicted hologram until the value of the loss function is less than a predefined threshold.
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公开(公告)号：US20250028089A1
公开(公告)日：2025-01-23
申请号：US18490121
申请日：2023-10-19
Applicant: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION
Inventor： Yeongmyeong PARK , Youngjin KIM , Gun-Yeal LEE , Byoungho LEE , Yoonchan JEONG
Abstract: A double sided meta lens includes a substrate having a first surface and a second surface facing each other, a first meta lens that includes a plurality of first nanostructures arranged on the first surface of the substrate and exhibits a first phase profile, and a second meta lens that includes a plurality of second nanostructures arranged on the second surface of the substrate and exhibits a second phase profile. The first phase profile may be configured such that a central region of the first meta lens operates as a convex lens and a peripheral region of the first meta lens operates as a concave lens, and the second phase profile may correspond to a focusing lens and has a section in which an absolute value of a phase slope increases with distance from a center of the second meta lens.
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Patent Agency Ranking
公开(公告)号：US20220390749A1
公开(公告)日：2022-12-08
申请号：US17879469
申请日：2022-08-02
Inventor： Jeonggeun YUN , Byoungho LEE , Kiseung BANG , Chanhyung YOO , Kyookeun LEE , Minseok CHAE
Abstract: Provided is a waveguide-type display device including a waveguide, an input coupler provided on the waveguide and configured to transmit an image to travel into the waveguide, an output coupler provided on the waveguide and configured to output the image traveling in the waveguide to an outside of the waveguide, and a field-of-view (FOV) expander configured to output an image having an expanded FOV by deflecting and outputting the image output from the output coupler in a certain direction based on polarization characteristics of the image.
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公开(公告)号：US20230400811A1
公开(公告)日：2023-12-14
申请号：US18116528
申请日：2023-03-02
Inventor： Seokil MOON , Dongheon YOO , Changkun LEE , Byoungho LEE , Minseok CHAE
CPC classification number: G03H1/32 , G03H1/2645 , G06T7/168 , G06T5/002 , G03H2226/02 , G03H2225/32 , G03H2001/2655 , G06T2207/20021 , G06T2200/24 , G06T2207/20048
Abstract: A hologram profile optimization method includes: setting a first hologram profile as a variable; and performing an optimization cycle a predetermined number of times, wherein the optimization cycle includes encoding the first hologram profile into a binary hologram profile by using an ApproxSign function; calculating a field value of a holographic image on a display surface for the binary hologram profile, considering high-order diffraction term noise of the holographic image by using a tiling function; calculating an intensity of the holographic image on the display surface; calculating a loss function value based on a difference between the intensity of the holographic image and an intensity of a target image; and updating the first hologram profile to a second hologram profile based on the loss function value.
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公开(公告)号：US20210397130A1
公开(公告)日：2021-12-23
申请号：US17242723
申请日：2021-04-28
Inventor： Sang-Ho KIM , Dukho LEE , Byungchoon YANG , Byoungho LEE , Jaebum CHO
Abstract: A hologram display device includes a light generator generating light, a spatial light modulator forming an interference pattern to interfere with the light, and a controller providing interference data to the spatial light modulator to form the interference pattern. The spatial light modulator includes a first area in which pixels are arranged in a first pattern, and a second area in which pixels are arranged in a second pattern. The controller includes a data generator generating first interference data for the first area and second interference data for the second area, a compensator generating first correction data based on the first interference data and second correction data by correcting the second interference data, and an output unit generating the interference data based on the first correction data and the second correction data.
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公开(公告)号：US20210191129A1
公开(公告)日：2021-06-24
申请号：US17131131
申请日：2020-12-22
Inventor： Changkun LEE , Byoungho LEE , Jinsoo JEONG , Seokil MOON , Geeyoung SUNG , Hongseok LEE
Abstract: A display apparatus including a volume grating-based combiner is disclosed. The display apparatus includes: an image providing device; and a combiner, wherein the combiner includes a plurality of volume gratings configured to diffract light containing an image, which is emitted from the image providing device, each volume grating has a first surface and a second surface facing each other, and each volume grating is further configured to diffract light incident on the first surface and transmit therethrough light incident on the second surface without diffraction.
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10.发明公开公开(公告)号：US20240210008A1
公开(公告)日：2024-06-27
申请号：US18597336
申请日：2024-03-06
Inventor： Yeoreum YOON , Byoungho LEE , Hanjin CHO , Yongsung KIM , Taeeun KIM , Siwoo LEE , Jiyong JANG
IPC: F21V5/00 , F21V19/00 , G01B11/24 , F21Y115/10
CPC classification number: F21V5/00 , F21V19/003 , G01B11/24 , F21Y2115/10
Abstract: A method of designing an optical system including a dome light and coaxial light, includes: determining a distance between the dome light and the coaxial light based on a radius reduction according to a hole of the dome light; determining a size of the coaxial light based on an optical path of a light ray emitted from the coaxial light; and determining a structure of a printed circuit board (PCB) in the dome light based on an optical path through which the light ray emitted from the coaxial light is reflected by an object.
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