WO2022085873A1 - Dispositif d'affichage proche de l'œil, fin, à grand angle de vision, et procédé associé - Google Patents

Dispositif d'affichage proche de l'œil, fin, à grand angle de vision, et procédé associé Download PDF

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Publication number
WO2022085873A1
WO2022085873A1 PCT/KR2021/002099 KR2021002099W WO2022085873A1 WO 2022085873 A1 WO2022085873 A1 WO 2022085873A1 KR 2021002099 W KR2021002099 W KR 2021002099W WO 2022085873 A1 WO2022085873 A1 WO 2022085873A1
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WO
WIPO (PCT)
Prior art keywords
light
fresnel
polarized light
display device
beam splitter
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Application number
PCT/KR2021/002099
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English (en)
Korean (ko)
Inventor
방기승
조영진
이병호
Original Assignee
서울대학교산학협력단
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Priority claimed from KR1020210011041A external-priority patent/KR102595351B1/ko
Application filed by 서울대학교산학협력단 filed Critical 서울대학교산학협력단
Publication of WO2022085873A1 publication Critical patent/WO2022085873A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays

Definitions

  • An embodiment of the present invention relates to a near-eye display device having a wide field of view (FOV) and having a thin thickness, such as in the form of glasses, and a method therefor.
  • FOV wide field of view
  • a wearable display By combining a wearable display with real-time posture tracking technology to provide a screen as if the user is in a virtual space, the user can feel a lively experience as if they are in a virtual space. This is called Virtual Reality (VR).
  • VR Virtual Reality
  • AR Augmented Reality
  • An object of the present invention is to provide a display apparatus and method capable of providing a wide viewing angle as well as being implemented as a device in the form of glasses by reducing a volume.
  • a display panel for outputting light; a folding unit for forming an optical path using a plurality of polarizing elements; Fresnel lens array in which Fresnel lenses are arranged; and a Fresnel light collecting device formed in a Fresnel structure to form an eye box at a predetermined distance.
  • an example of a display method includes the steps of outputting light using a display panel; forming an optical path over a predetermined distance by repeatedly reflecting light over a predetermined number of times using a plurality of polarizing elements; Floating an image of a display panel over a predetermined distance using a Fresnel lens array in which a plurality of Fresnel lenses are arranged; and forming an eye box at a predetermined distance by refracting light in an eye box direction using a Fresnel light collecting device formed in a Fresnel structure.
  • a VR device in the form of glasses instead of the existing headset by securing a wide viewing angle while significantly reducing the volume of the optical system.
  • a transparent augmented reality (AR) device can be implemented in a size as small as the shape of glasses.
  • FIG. 1 is a view showing the configuration of an example of a near-eye display device according to an embodiment of the present invention
  • FIG. 2 is a view showing an example of a detailed configuration of a folding unit according to an embodiment of the present invention
  • FIG. 3 is a view showing the configuration of another embodiment of a display device according to an embodiment of the present invention.
  • FIG. 4 is a view showing an example of a prototype of a display device according to an embodiment of the present invention.
  • FIG. 5 is an enlarged view showing a layer structure of an optical system of a display device according to an embodiment of the present invention.
  • 6 and 7 are diagrams illustrating an example of an image display experiment result using a display device according to an embodiment of the present invention.
  • FIG. 1 is a diagram illustrating a configuration of an example of a near-eye display apparatus according to an embodiment of the present invention.
  • the display apparatus 100 includes a display panel 110 , a folding unit 120 , a Fresnel lens array 130 , and a Fresnel light collecting device 140 .
  • the display device 100 is in the form of glasses for outputting images to both eyes as shown in FIG. 4 or It can be manufactured in various forms, such as a VR device that can be worn on the head.
  • the display panel 110 may be implemented with various types of conventional panels, such as a liquid crystal display (LCD) or a light emitting diode (LED). In another embodiment, the display panel 110 may be implemented as a transparent panel as shown in FIG. 3 . The display panel may output an image for virtual reality or augmented reality.
  • LCD liquid crystal display
  • LED light emitting diode
  • the display panel 110 may be implemented as a transparent panel as shown in FIG. 3 .
  • the display panel may output an image for virtual reality or augmented reality.
  • the folding unit 120 extends the length of the transmission path of the light output from the display panel 110 beyond the physical thickness d of the folding unit 120 to reduce the thickness of the display device 100 . It is composed of a polarizing element. The light output from the display panel 110 is reflected several times within the folding unit 120 to increase the optical travel distance. An example of the detailed configuration of the folding unit 120 is shown in FIG. 2 .
  • the Fresnel lens array 130 is composed of a plurality of cells in which the Fresnel lens is present. That is, the Fresnel lens array 130 has a structure in which a plurality of Fresnel lenses are arranged. All of the Fresnel lenses may be arranged at the same interval, or all or some of the Fresnel lenses may be arranged at different intervals. The size of each cell of the Fresnel lens array 130 may be all the same or all or part of the size may be different from each other. In addition, all of the Fresnel lenses of each cell constituting the Fresnel lens array 130 may have the same shape, or some or all of them may be implemented in different shapes.
  • the Fresnel lens of each cell of the Fresnel lens array 130 has the effect that the image output from the display panel 110 appears at a distance (eg, 2m or more or infinity distance) at a distance (that is, floating) ) can contribute to making
  • a general optical element should have a very thick curved shape, but the Fresnel lens array 130 may implement a short focal length or a large refraction angle with a thin thickness. That is, when using the Fresnel lens array 130 compared to using a single lens, the focal length can be shortened, thereby reducing the volume of the display device 100 . Since the Fresnel lens array 130 can be implemented in a very thin and flat structure, it can be implemented in close contact with the folding unit 120 .
  • the Fresnel light collecting device 140 serves to collect the light output from the Fresnel lens array 130 toward the user's eyes.
  • the viewing angle can be amplified through the Fresnel lens array 130 and the Fresnel light collecting device 140 , and an eye box can be formed with an appropriate eye relief.
  • the eye box refers to an area in which a projected image can be maintained clearly.
  • the Fresnel light collecting device 140 may be implemented as a Fresnel lens or as a Fresnel prism array.
  • a Fresnel prism array is a structure in which very small prisms (ie, micro prisms) are arranged.
  • a VR optical system performs a floating function that floats the image of a display panel at a long distance and a light collection function that collects light toward the user's eyes at the same time. It is possible for one lens to simultaneously perform both functions when the focal length is long, but when the focal length is short and the f-number is small, it is difficult to satisfy both the floating function and the condensing function with one lens. In order to design a single lens that satisfies both functions, the complexity of the system increases, such as the thickness of the lens must be thick or the need for multiple layers, which makes it impossible to compose the optical system compactly. will fall out If the condensing function is not secured among the two functions, the viewing angle cannot be secured, and if the floating function is not secured, severe optical aberration occurs.
  • the present embodiment achieves the floating function and the light collecting function through the combination of the Fresnel lens array 130 and the Fresnel light collecting device 140 .
  • the Fresnel lens array 130 mainly focuses on the floating function to optimize the Fresnel lens structure of each cell
  • the Fresnel light collecting device 140 mainly focuses on the light collecting function to focus on the Fresnel lens structure or The prism structure is optimized. Therefore, it is possible to implement a floating function and a light collecting function through the combination of the Fresnel lens array 130 and the Fresnel light collecting device 140, so that it is possible to implement an optical system having a wide viewing angle and little distortion while having a very thin form factor.
  • various conventional methods for optimizing the structure of each Fresnel lens for a desired floating function and a desired light collecting function may be applied to the present embodiment.
  • the refraction-based Fresnel optical elements 130 and 140 are more capable of realizing a full-color display than diffraction-based elements such as SRG (Surface Relief Grating), HOE (Holographic Optical Element), and PBP (Pancharanam Berry Phase). It is advantageous.
  • a diffraction-based element has a very large chromatic aberration when a lens is formed because the diffraction angle is proportional to the wavelength of light.
  • multiple diffraction crystals must be multiplexed, and three laser light sources with very thin spectral characteristics must be used for each color, which greatly increases the complexity of the system.
  • the Fresnel optical elements 130 and 140 are refractive-based elements and have very small chromatic aberration compared to the diffraction-based elements. Since the chromatic aberration of the refraction-based device depends on the refractive index change characteristic with respect to the wavelength of the medium, the degree of change is very small in the visible light region, so that only one device can constitute a full-color display.
  • the Fresnel optical elements 130 and 140 are more advantageous than the diffraction-based elements in realizing a compact system.
  • optical elements 120 , 130 , and 140 of the present embodiment can be implemented in a thin structure, there is little thickness required for the optical system other than a predetermined physical distance d for forming the optical path of the folding unit 120 .
  • all optical elements can be designed in a flat structure, they can be implemented in the form of flat glasses as shown in FIG. 4 .
  • FIG. 2 is a diagram illustrating an example of a detailed configuration of a folding unit according to an embodiment of the present invention.
  • the folding unit 120 includes a circular polarizer 200 , a beam splitter 210 , a wave plate 220 , and a polarization beam splitter. ) (230).
  • the beam splitter 210 and the polarization beam splitter 230 are spaced apart by a predetermined distance to form an optical path.
  • the circularly polarized light unit 200 converts incident light into circularly polarized light.
  • the circularly polarized light unit 200 converts light (unpolarized light) emitted from the display panel 110 into circularly polarized light and outputs the converted light.
  • the beam splitter 210 transmits a portion of the incident light and reflects the rest.
  • the beam splitter 210 may reflect 50% of incident light and transmit 50% of the incident light.
  • 50% of the circularly polarized light emitted from the circularly polarized part 200 passes through the beam splitter 210 .
  • the transmittance of the beam splitter 210 may be variously modified according to an embodiment.
  • the wave plate 220 forms an optical path difference of a predetermined wavelength to the incident light.
  • the wave plate 220 may be implemented as a QWP (Quarter Wave Plate) that forms an optical path difference of 1/4 ⁇ .
  • the wave plate 220 outputs linearly polarized light obtained by shifting the circularly polarized light emitted from the beam splitter 210 by a phase of 1/4 ⁇ .
  • the polarization beam splitter 230 transmits polarized light in a predefined direction.
  • the polarization beam splitter 230 may transmit p-polarized light or transmit s-polarized light.
  • the polarization beam splitter may reflect 100% of incident light, not p-polarized light, and transmit 100% of the p-polarized light.
  • Circularly polarized light emitted from the circular polarizer 200 passes through the beam splitter 210 and is incident on the wave plate 220 , and the wave plate 220 outputs linearly polarized light having a phase shift of 1/4 ⁇ . Since the linearly polarized light emitted from the wave plate 220 is not p-polarized, it is reflected toward the wave plate 220 by the polarization beam splitter. The reflected linearly polarized light is directed toward the beam splitter 210 after a phase shift of 1/4 ⁇ occurs again while passing through the wave plate 220 .
  • the beam splitter 210 reflects the light emitted from the wave plate 220 back to the wave plate 220 .
  • the beam splitter 210 may reflect 50% of the light emitted from the wave plate 200 .
  • the light reflected back to the wave plate 220 by the beam splitter 210 has a phase shift of 1/4 ⁇ again by the wave plate 220, and as a result, the linearly polarized light transmitted through the wave plate 220 is p - It becomes polarized. Accordingly, the linearly polarized light (ie, p-polarized light) emitted from the wave plate 220 passes through the polarization beam splitter 230 and is incident on the next optical element.
  • the beam splitter 210 reflects 50% of the incident light, the energy of the p-polarized light finally output from the polarization beam splitter 230 is 25% compared to the light initially incident on the folding unit 120 . .
  • the display panel 110 Since the light emitted from the display panel 110 is repeated three times back and forth between the beam splitter 210 and the polarization beam splitter 230 of the folding unit 120, the display panel 110 and the Fresnel lens array 130. An optical distance equivalent to three times the physical distance between them can be secured. Since the physical distance of the optical system of the display apparatus 100 can be reduced by 1/3 through the folding unit 120 , the volume of the display apparatus 100 can be reduced. Since the physical distance can be further reduced through the folding unit 120 in addition to the reduced optical distance due to the use of the Fresnel lens array 130 , the distance of the optical system of the display apparatus 100 can be implemented very short.
  • FIG. 3 is a diagram showing the configuration of another embodiment of a display device according to an embodiment of the present invention.
  • the display device includes a linear polarizer 300 , a transparent screen 310 , a waveguide 320 , and a polarization-dependent optical device 330 .
  • the polarization-dependent optical device 330 includes a salpin Fresnel lens array 130 and a Fresnel light collecting device 140 in FIG. 1 .
  • the folding unit 120 may be omitted.
  • the transparent screen 310 is a transparent panel implemented with a holographic diffusion plate or a polarization-dependent diffusion plate.
  • the waveguide 320 provides a path for the light 340 to travel from the image source to the transparent screen 310 .
  • the structure and method of the waveguide 320 for transmitting the light 340 from the image source to the transparent screen may be variously modified.
  • the external light 350 of the real world and the light 345 output from the transparent screen 310 are both incident to the user's eyes. That is, when the display device of the present embodiment is used, augmented reality may be provided.
  • the external light 350 is directly incident to the user's eye, and the light 345 of the transparent screen 310 must be incident to the user's eye through a predetermined optical system salpin in FIGS. 1 and 2 .
  • the polarization directions of the external light 350 and the light 345 of the transparent screen are different from each other.
  • light output from the transparent screen 310 may be implemented as p-polarized light.
  • the transparent screen 310 may receive the p-polarized image light 340 through the waveguide 320 and output it.
  • the external light 350 in the real world may be converted into s-polarized light through the linear polarizer 300 . That is, the linear polarization unit 300 converts real-world light (unpolarized light) 350 coming from the outside of the display device into s-polarized light 360 and outputs it.
  • the linear polarizer 300 may be implemented to convert the external light 350 into p-polarized light and output it. The following embodiment will be described on the assumption that the linear polarizer 300 outputs the s-polarized light 360 .
  • the s-polarized light 360 emitted from the linear polarizer 300 passes through the transparent screen 310 and the waveguide 320 as it is and is incident on the polarization-dependent optical device 330 . Since the s-polarized light 360 is light incident from the real world, it is preferable to pass through the polarization-dependent optical element 330 as it is and enter the user's eyes.
  • the polarization-dependent optical element 330 may be implemented as a p-polarization-dependent optical element so that the s-polarization 360 can pass through the polarization-dependent optical element 330 as it is.
  • both of the Fresnel lens array 130 and the Fresnel light collecting device 140 constituting the polarization-dependent optical device 330 transmit p-polarized light and cause refraction for only s-polarized light (birefringent). ) can be implemented as a material with properties.
  • the p-polarized light 345 emitted from the transparent screen 310 is refracted by the polarization-dependent light element 330 in the salpin method shown in FIG. 1 and is incident on the user's eyes.
  • FIG. 4 is a diagram illustrating an example of a prototype of a display device according to an embodiment of the present invention.
  • the display device can be implemented in the form of thin glasses.
  • the display device of the present embodiment can be implemented with a thin thickness and light weight, portability can be greatly improved, and wearability can be improved to increase the range of a user's virtual reality utilization time and environment.
  • the display method of the present embodiment can be used to implement mixed reality (MR), a true meaning that can be worn for a long time even in daily life.
  • MR mixed reality
  • augmented reality device when used as an augmented reality device, it provides the advantage of observing images of the real world with the naked eye without digital processing and provides a wide viewing angle comparable to that of a virtual reality device, so that users can feel a deeper sense of immersion. It is possible to implement mixed reality and augmented reality without concern.
  • FIG. 5 is an enlarged view illustrating a layer structure of an optical system of a display device according to an embodiment of the present invention.
  • the thickness of the folding part implemented by QWP, a beam splitter, QWP, which serves as a circular polarizer, a spacer, glass, and a polarizing beam splitter that forms a predetermined interval to form an optical path is several mm.
  • the display device can be implemented with a thickness of about 8.8 mm including the display panel.
  • This embodiment is only one example to show that the thickness of the display device can be reduced, and the thickness of each element and the distance between the elements are not limited to this embodiment. For example, since the thickness of each element can be made thinner, it is also possible to implement a display device thinner than the present embodiment.
  • 6 and 7 are diagrams illustrating an example of an image display experiment result using a display device according to an embodiment of the present invention.
  • the left image 600 is rearranged to correspond to each cell of the Fresnel lens array of the display device to generate the right image 610, and then the right image 610 is input to the display panel of the display device .
  • various conventional methods for rearranging an image input to a display panel as shown in FIG. 6 may be applied to this embodiment.
  • the display device when the display device outputs the right image 610 of FIG. 6 through the display panel, the user's eyes see the image 700 of a wide viewing angle as shown in FIG. 7 .
  • the display device of this embodiment has a thin structure, it is possible to provide a user with a high-resolution full-color image having a viewing angle of 102 degrees * 102 degrees, and also can secure an eye box of a stable size of 8 mm * 8 mm or more.

Abstract

Sont divulgués un dispositif d'affichage proche de l'œil, fin, à grand angle de vision, ainsi qu'un procédé associé. Le dispositif d'affichage comprend : un panneau d'affichage qui émet de la lumière ; une partie pliable qui forme un chemin optique à l'aide d'une pluralité d'éléments de polarisation ; un réseau de lentilles de Fresnel dans lequel des lentilles de Fresnel sont disposées à des intervalles définis ; et un capteur à lentille de Fresnel qui est formé d'une structure de Fresnel et forme une région oculaire à une distance définie.
PCT/KR2021/002099 2020-10-21 2021-02-19 Dispositif d'affichage proche de l'œil, fin, à grand angle de vision, et procédé associé WO2022085873A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2020-0137090 2020-10-21
KR20200137090 2020-10-21
KR10-2021-0011041 2021-01-26
KR1020210011041A KR102595351B1 (ko) 2020-10-21 2021-01-26 얇은 광시야각 근안 디스플레이장치 및 그 방법

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WO2022085873A1 true WO2022085873A1 (fr) 2022-04-28

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180074940A (ko) * 2016-12-26 2018-07-04 엘지디스플레이 주식회사 헤드 장착형 디스플레이
KR20180084263A (ko) * 2017-01-16 2018-07-25 엘지이노텍 주식회사 광학계, 광학 장치 및 이를 포함하는 가상 현실 구현을 위한 헤드 장착 표시 장치
US20180239177A1 (en) * 2017-02-23 2018-08-23 Magic Leap, Inc. Variable-focus virtual image devices based on polarization conversion
KR20180129639A (ko) * 2017-05-27 2018-12-05 이문기 거울을 이용한 투명한 안경형 디스플레이
US20190018255A1 (en) * 2017-07-11 2019-01-17 Google Llc Compact near-eye optical system including a refractive beam-splitting convex lens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180074940A (ko) * 2016-12-26 2018-07-04 엘지디스플레이 주식회사 헤드 장착형 디스플레이
KR20180084263A (ko) * 2017-01-16 2018-07-25 엘지이노텍 주식회사 광학계, 광학 장치 및 이를 포함하는 가상 현실 구현을 위한 헤드 장착 표시 장치
US20180239177A1 (en) * 2017-02-23 2018-08-23 Magic Leap, Inc. Variable-focus virtual image devices based on polarization conversion
KR20180129639A (ko) * 2017-05-27 2018-12-05 이문기 거울을 이용한 투명한 안경형 디스플레이
US20190018255A1 (en) * 2017-07-11 2019-01-17 Google Llc Compact near-eye optical system including a refractive beam-splitting convex lens

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