WO2017115883A1 - Procédé et dispositif d'affichage holographique utilisant un multiplexage angulaire temporel - Google Patents

Procédé et dispositif d'affichage holographique utilisant un multiplexage angulaire temporel Download PDF

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Publication number
WO2017115883A1
WO2017115883A1 PCT/KR2015/014313 KR2015014313W WO2017115883A1 WO 2017115883 A1 WO2017115883 A1 WO 2017115883A1 KR 2015014313 W KR2015014313 W KR 2015014313W WO 2017115883 A1 WO2017115883 A1 WO 2017115883A1
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WO
WIPO (PCT)
Prior art keywords
optical system
wavefront
holographic display
slm
lens
Prior art date
Application number
PCT/KR2015/014313
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English (en)
Korean (ko)
Inventor
홍지수
강훈종
홍성희
김영민
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전자부품연구원
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Publication of WO2017115883A1 publication Critical patent/WO2017115883A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2294—Addressing the hologram to an active spatial light modulator
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G03H2001/2207—Spatial filter, e.g. for suppressing higher diffraction orders
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G03H2001/221—Element having optical power, e.g. field lens
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H2001/2236—Details of the viewing window
    • G03H2001/2239—Enlarging the viewing window
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2222/00—Light sources or light beam properties
    • G03H2222/36—Scanning light beam

Definitions

  • the present invention relates to holographic technology, and more particularly, to a holographic display method and apparatus by multiplexing.
  • Holographic display technology is a technology for recording and reproducing a wavefront that is diffusely reflected from an object, and has a great advantage in that it can provide a nearly perfect three-dimensional shape.
  • hologram display panel that can perfectly express the hologram
  • LCD liquid crystal display
  • LCDoS liquid crystal on silicon
  • SLMs spatial light modulators
  • SLMs provide a narrow field of view (visual field) due to insufficient pixel spacing to display holograms, which makes it difficult to enlarge the hologram or increase the viewing angle.
  • the spatial bandwidth product is invariant, and thus the hologram image is reduced.
  • a method of enlarging a space using a plurality of SLMs and a method of increasing a bandwidth using a reduced optical system is used.However, due to the problem of using a plurality of SLMs and the use of a reduced optical system, There is a limit to increasing the size.
  • the present invention has been made to solve the above problems, an object of the present invention is to increase the hologram image or to ensure a sufficient viewing angle even when using a single SLM, diffraction by SLM
  • the present invention provides a holographic display method and apparatus by visual multiplexing that increases a viewing angle by multiplexing a wavefront in space and space.
  • a holographic display device includes: a spatial light modulator (SLM) for diffracting incident plane waves by displaying a holographic interference pattern; An optical system for enlarging the wavefront diffracted by the SLM; And a first mirror configured to change a traveling path of the wavefront in a first direction in the optical system.
  • SLM spatial light modulator
  • An optical system for enlarging the wavefront diffracted by the SLM
  • a first mirror configured to change a traveling path of the wavefront in a first direction in the optical system.
  • the holographic display device may further include a second mirror configured to change a traveling path of the wavefront in a second direction in the optical system.
  • first direction and the second direction may be vertical.
  • the first mirror may be positioned in a focal plane of the first optical system constituting the optical system.
  • the first optical system may include a lens-1 and a lens-2.
  • the holographic display device may further include a filter positioned between the lens-1 and the lens-2 and transmitting only a first-order diffraction component at a wavefront diffracted by the SLM. Can be.
  • the second mirror may be positioned in a focal plane of the second optical system constituting the optical system.
  • the second optical system may include a lens-3 and a lens-4.
  • the optical system may further include a third optical system for reimaging the wavefront changed in the direction by the second mirror on the holographic display plane.
  • the third optical system may include a lens-5 and a lens-6.
  • the holographic display plane may be located in the focal plane of the third optical system.
  • the size of the wavefront reimaged to the holographic display plane for the size of the SLM may be a product of the magnification of the first optical system, the magnification of the second optical system, and the magnification of the third optical system. .
  • the holographic display method the step of displaying a holographic interference pattern; Diffracting the incident plane wave; Dean system for enlarging the diffracted wavefront; And changing the traveling path of the wavefront in a first direction.
  • the holographic display method may further include changing a traveling path of the wavefront in a second direction.
  • a holographic display system SLM (Spatial Light Modulator) to diffract the plane wave incident by displaying the holographic interference pattern, the optical system and the optical system to enlarge the wavefront diffracted by the SLM
  • SLM Spatial Light Modulator
  • a holographic display device including a first mirror configured to change a traveling path of the wavefront in a first direction within the vehicle; And a computing device generating a holographic interference pattern displayed on the SLM with reference to the first direction.
  • the holographic display by multiplexing the degree of vision, it is possible to enlarge the size and increase the viewing angle on the hologram display plane while using one SLM, and enable natural hologram display. Do.
  • FIG. 1 illustrates a holographic display device according to an embodiment of the present invention
  • FIG. 2 is a view showing a result of increased viewing angle in a hologram display plane located in front of an observer;
  • 3 is a diagram illustrating angle multiplexing by GM
  • FIG. 4 is a view provided for explaining a method of controlling an SLM of a holographic display device
  • FIG. 5 is a flowchart provided to explain a holographic display method according to another exemplary embodiment of the present invention.
  • FIG. 1 is a diagram illustrating a holographic display device according to an embodiment of the present invention.
  • the holographic display device according to an embodiment of the present invention performs a holographic display by visual multiplexing.
  • a holographic display device includes a spatial light modulator (SLM) 110, a band pass filter (BPF) 120, and two GM ( Galvano Mirror (Galvano Mirror) (131, 132) and relay optical system (151 ⁇ 156).
  • SLM spatial light modulator
  • BPF band pass filter
  • GM Galvano Mirror
  • 151 ⁇ 156 relay optical system
  • the SLM 110 is a device capable of displaying a holographic interference pattern.
  • the SLM 110 is implemented as a digital micromirror device (DMD).
  • DMD digital micromirror device
  • the SLM 110 does not exclude implementation with other devices.
  • the relay optical system 151 to 156 includes six lenses L1 to L6.
  • the BPF 120 is a spatial filter that transmits only the first order diffraction component in the spatial frequency domain.
  • the GM1 131 controls the traveling direction of the light in the horizontal direction in the reimaging plane
  • the GM-22 132 controls the traveling direction of the light in the vertical direction in the reimaging plane.
  • a computing device displays a holographic interference pattern on an SLM 110 capable of representing a hologram.
  • the plane wave generated by the light source (not shown) is incident on the SLM 110.
  • the incident plane wave is diffracted by the holographic interference pattern represented in the SLM 110, and the diffracted wavefront is composed of non-diffracted zeroth order components, ⁇ first order diffraction components, and higher order diffraction components of ⁇ 2nd order or more.
  • Both the zero diffraction component and the diffraction components pass through the lens L1 151 and are evenly distributed in the focal plane, that is, the spatial frequency domain, by the lens L1 151. However, only the first diffraction component necessary for hologram display is transmitted by the BPF 120.
  • the transmitted first diffraction component is reimaged by the lens L2 152 in the focal plane of the lens L2 152.
  • the focal plane of L2 152 will be referred to as reimaging plane-1.
  • the reimaging plane-1 comprises a holographic interference pattern as a complex field with only the first diffraction components diffracted by the SLM 110. This is not a holographic interference pattern any more, it can be seen that the wavefront for the three-dimensional object / image to be displayed in the hologram plane.
  • the GM1 131 is positioned in the reimaging plane-1, and the GM1 131 controls the beam path in the horizontal direction.
  • the wavefront reflected by GM1 131 is reimaged to the focal plane of lens L4 154 by lens L3 153 and lens L4 154.
  • the focal plane of L4 152 will be referred to as reimaging plane-2.
  • GM2 132 controls the path of the beam in the vertical direction.
  • the wavefront reflected by the GM2 131 is reimaged to the focal plane of the lens L6 156 by the lens L5 155 and the lens L6 156.
  • the focal plane of L6 156 will be referred to as reimaging plane-3 140.
  • the size of the wavefront reimaged in the reimaging plane-1 where the GM1 131 is located is determined by the focal ratio of the lens L1 151 and the lens L2 152.
  • the magnitude of the wavefront reimaged at the reimaging plane-2 where GM2 132 is located is determined by the focal ratio of lens L3 153 and lens L4 154, and reimaged to reimaging plane-3 140.
  • the size of the imaged wavefront is determined by the focal ratio of lens L5 155 and lens L5 155.
  • magnification M 12 on the wavefront in the reimaging plane-1 the magnification M 34 on the wavefront in the reimaging plane-2, and the magnification M 56 on the wavefront in the reimaging plane-3140 are as follows.
  • M 12 f 2 / f 1
  • M 34 f 3 / f 4
  • M 56 f 5 / f 6
  • the size of the wavefront in the reimaging plane-3 140 which is a hologram display plane positioned in front of the viewer, has a magnification of M total with respect to the SLM 110.
  • the size of the finally displayed holographic display plane can be enlarged through the magnification of each lens 151 to 156.
  • the viewing angle of the holographic display is defined by the diffraction angle ⁇ of the SLM 110, and is calculated as follows.
  • ⁇ is the wavelength of the laser used as the display light source
  • ⁇ p is the pixel spacing of the SLM (110).
  • the diffraction angle is about 2.6 degrees. 2.6 degrees represents an unsuitable viewing angle from a general display standpoint.
  • the holographic display device proposed in the embodiment of the present invention multiplexes the diffracted wavefront by angular tilting by a predetermined angle unit, thereby increasing the overall viewing angle.
  • Figure 2 shows the result of the increased viewing angle in the reimaging plane-3 (140), which is a holographic display plane located in front of the observer.
  • the diffraction angle is converted by the magnification of the lens, which magnification is inversely proportional to the total lens magnification M total .
  • the GM1, 2 131 and 132 are steered at a predetermined angle to view the diffracted wavefront in a single diffraction angle unit. Multiplexing is also possible.
  • the GMs 131 and 132 are mirrors that reflect light, but the GMs 131 and 132 are shown in a form in which light is transmitted by the GMs 131 and 132 without being reflected.
  • the optical axis is bent at about 90 degrees at GM1 131 and at 90 degrees at GM2 132.
  • FIG. 4 is a diagram provided to explain a method of controlling the SLM 110 of the holographic display device. As shown in FIG. 4, the computing device 200 displays the holographic interference pattern on the SLM 110.
  • the holographic interference pattern displayed on the SLM 110 by the computing device 200 is controlled in synchronization with the rotation angles of the GM1 131 and the GM2 132. This is because the portions of the reimaging plane-3 140 whose resurfacing images are reimaged are determined by the rotation angles of the GM1 131 and the GM2 132.
  • the computing device 200 SLM generates a holographic interference pattern that can generate a wavefront to be reimaged in a corresponding portion of the reimaging plane-3 140 with reference to the rotation angles of the GM1 131 and the GM2 132. (110).
  • FIG. 5 is a flowchart provided to explain a holographic display method according to another exemplary embodiment of the present invention.
  • the computing device 200 displays a holographic interference pattern on the SLM 110 (S310), and generates a wavefront for a 3D object / image configured by diffraction (S320). .
  • the BPF 120 extracts only the first diffraction component constituting the wavefront for the three-dimensional object / image generated in step S320 (S330), GM1 (131) and GM2 (132) through the high-speed angle multiplexing
  • the wavefront viewed at an angle is multiplexed in space by a predetermined angle unit (S340).
  • the relay optical systems 151 to 156 enlarge the size in the hologram display plane finally displayed to M total .
  • an SLM having a high frame rate as a holographic display panel, it is possible to enlarge the size and the viewing angle on the hologram display plane through the multiplexing of the wavefront diffracted by the SLM, and to increase the viewing angle.
  • a device and method capable of holographic display are presented.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Holo Graphy (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

L'invention concerne un procédé et un dispositif d'affichage holographique utilisant un multiplexage angulaire temporel. Un dispositif d'affichage holographique selon un mode de réalisation de la présente invention comprend : un SLM affichant un motif d'interférence holographique de façon à diffracter une onde plane incidente ; un système optique pour amplifier un front d'onde diffracté par le SLM ; et un premier miroir pour changer le chemin de propagation du front d'onde en une première direction dans le système optique. Au moyen de l'affichage holographique par multiplexage, l'agrandissement de la taille et l'augmentation de l'angle de visualisation d'un plan d'affichage d'hologramme sont possibles tout en utilisant un seul SLM, et un affichage d'hologramme naturel est possible.
PCT/KR2015/014313 2015-12-27 2015-12-28 Procédé et dispositif d'affichage holographique utilisant un multiplexage angulaire temporel WO2017115883A1 (fr)

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Application Number Priority Date Filing Date Title
KR10-2015-0187022 2015-12-27
KR1020150187022A KR101842753B1 (ko) 2015-12-27 2015-12-27 시각도 다중화에 의한 홀로그래픽 디스플레이 방법 및 장치

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11561511B2 (en) 2019-12-30 2023-01-24 Electronics And Telecommunications Research Institute Method and apparatus for generating hologram with wide viewing angle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4208086A (en) * 1976-05-28 1980-06-17 Perry Lawrence M Three-dimensional projection system
US20050041271A1 (en) * 2002-01-16 2005-02-24 Ito Tomoyoshi Moving image holography reproducing device and color moving image holography reproducing device
US20070188858A1 (en) * 2002-10-05 2007-08-16 F. Poszat Hu, L.L.C. Reconfigurable spatial light modulators
KR101277370B1 (ko) * 2005-05-13 2013-06-20 씨리얼 테크놀로지스 게엠베하 장면의 홀로그래픽 재생을 위한 투사 장치 및 투사 방법
KR20150097029A (ko) * 2014-02-17 2015-08-26 한국전자통신연구원 디지털 홀로그래픽 디스플레이 장치 및 방법

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006004301A1 (de) 2006-01-20 2007-08-02 Seereal Technologies S.A. Holographische Projektionsvorrichtung zur Vergrößerung eines Rekonstruktionsbereichs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4208086A (en) * 1976-05-28 1980-06-17 Perry Lawrence M Three-dimensional projection system
US20050041271A1 (en) * 2002-01-16 2005-02-24 Ito Tomoyoshi Moving image holography reproducing device and color moving image holography reproducing device
US20070188858A1 (en) * 2002-10-05 2007-08-16 F. Poszat Hu, L.L.C. Reconfigurable spatial light modulators
KR101277370B1 (ko) * 2005-05-13 2013-06-20 씨리얼 테크놀로지스 게엠베하 장면의 홀로그래픽 재생을 위한 투사 장치 및 투사 방법
KR20150097029A (ko) * 2014-02-17 2015-08-26 한국전자통신연구원 디지털 홀로그래픽 디스플레이 장치 및 방법

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11561511B2 (en) 2019-12-30 2023-01-24 Electronics And Telecommunications Research Institute Method and apparatus for generating hologram with wide viewing angle

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KR101842753B1 (ko) 2018-03-28

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