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WO2025060719A1 - Système optique proche de l'oeil et dispositif d'affichage porté sur la tête - Google Patents

Système optique proche de l'oeil et dispositif d'affichage porté sur la tête Download PDF

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Publication number
WO2025060719A1
WO2025060719A1 PCT/CN2024/110380 CN2024110380W WO2025060719A1 WO 2025060719 A1 WO2025060719 A1 WO 2025060719A1 CN 2024110380 W CN2024110380 W CN 2024110380W WO 2025060719 A1 WO2025060719 A1 WO 2025060719A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical system
liquid crystal
lens
crystal film
imaging element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/110380
Other languages
English (en)
Chinese (zh)
Inventor
史柴源
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goertek Optical Technology Co Ltd
Original Assignee
Goertek Optical Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Goertek Optical Technology Co Ltd filed Critical Goertek Optical Technology Co Ltd
Publication of WO2025060719A1 publication Critical patent/WO2025060719A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G02B27/017—Head mounted
    • G02B27/0172—Head mounted characterised by optical features
    • 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
    • G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
    • 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
    • G02B27/10—Beam splitting or combining systems
    • 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
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133631—Birefringent elements, e.g. for optical compensation with a spatial distribution of the retardation value
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • 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
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/011—Head-up displays characterised by optical features comprising device for correcting geometrical aberrations, distortion
    • 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
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view

Definitions

  • the embodiments of the present application relate to the field of optical display technology, and more specifically, to a near-eye optical system and a head-mounted display device.
  • the optical solution of VR equipment is relatively thick.
  • VR glasses as an example, they are somewhat different from conventional glasses, and users do not feel comfortable wearing them, especially after wearing them for a long time.
  • How to minimize the thickness of the optical system inside the VR device (along the optical axis) while ensuring high-definition imaging is a problem that needs to be solved.
  • the purpose of this application is to provide a new technical solution for a near-eye optical system and a head-mounted display device, which can achieve a lightweight design of the near-eye optical system while taking into account high-definition imaging.
  • the present application provides a near-eye optical system.
  • the near-eye optical system comprises a first imaging element and a second imaging element arranged along the same optical axis;
  • the first imaging element includes a polarized reflection element and a phase retarder
  • the second imaging element includes at least one lens and at least one optical component, wherein the optical component is configured to selectively reflect and transmit circularly polarized light.
  • the first imaging element and the second imaging element are used to make the number of folds of the light in the light path be ⁇ 2;
  • the light can be refracted once in one of the optical components.
  • the optical component includes at least one of a first liquid crystal film and a second liquid crystal film;
  • the second liquid crystal film is configured so that when reflecting circularly polarized light, the rotation direction of the circularly polarized light does not change.
  • the optical component includes any one of the first liquid crystal film and the second liquid crystal film.
  • the optical component also includes a beam splitter film.
  • the second imaging element comprises a first lens
  • any one of the first liquid crystal film and the second liquid crystal film is stacked with the light-splitting film and is disposed on any surface of the first lens.
  • FIG2 is a schematic diagram of the arrangement positions of an optical component, a phase retarder, and a polarization reflection element provided in an embodiment of the present application;
  • FIG6 is a diagram of field curvature and distortion of the near-eye optical system provided in FIG1 ;
  • FIG8 is a second schematic diagram of the structure of the near-eye optical system provided in an embodiment of the present application.
  • FIG10 is a modulation transfer function MTF diagram of the near-eye optical system provided in FIG8 ;
  • FIG11 is a diagram of field curvature and distortion of the near-eye optical system provided in FIG8 ;
  • FIG12 is a vertical axis chromatic aberration diagram of the near-eye optical system provided in FIG8 ;
  • the polarized reflective element 21 is, for example, a linear polarizer, which is, for example, a horizontal linear polarizer.
  • a polarizing reflector is a polarizing reflector that reflects linear polarized light at a vertical angle and transmits linear polarized light at a vertical angle, or a polarizing reflector that reflects linear polarized light at any other specific angle and transmits linear polarized light at a direction perpendicular to the angle.
  • the polarized reflection element 21 and the phase retarder 22 arranged on the near-screen side can make the light directed to the second imaging element 3 circularly polarized light, and the optical component 31 in the second imaging element 3 can selectively reflect and transmit the incident circularly polarized light, which realizes a new folding optical path optical structure, under which only one lens can be introduced into the second imaging element 3, thereby reducing the number of lenses used in the entire near-eye optical system, thereby facilitating the realization of an ultra-thin design of the near-eye optical system.
  • the light is folded back multiple times between the first imaging element 2 and the second imaging element 3, which is conducive to clear imaging.
  • two or more lenses may be used in the near-eye optical system as needed.
  • two lenses may be used in the near-eye optical system, see FIG. 8 , and an additional lens may be disposed in the first imaging element 2 , which lens may be used to support the polarizing reflection element 21 and the phase retarder 22 , for example.
  • the imaging effect can be improved as the number of lenses used increases, but the weight and production cost of the near-eye optical system may increase.
  • the first imaging element 2 and the second imaging element 3 are used to make the light bend ⁇ 2 times in the optical path; wherein the light can be bend once in one of the optical components 31 .
  • the polarized reflective element 21 the phase retarder 22 , and the optical component 31 are introduced into the optical architecture of the near-eye optical system to form a folded optical path.
  • the light used for imaging display will be reflected by the polarized reflection element 21, the phase The retarder 22 and the optical component 31 are folded twice.
  • the horizontal linear polarized light passes through the polarization reflection element 21 and is directed to the phase retarder 22.
  • the phase retarder 22 converts the horizontal linear polarized light into left-handed circularly polarized light.
  • the left-handed circularly polarized light is reflected by the optical component 31 and converted into right-handed circularly polarized light.
  • the right-handed circularly polarized light passes through the phase retarder 22 and becomes vertical linear polarized light.
  • the vertical linear polarized light is reflected by the polarization reflection element 21 to the phase retarder 22 and becomes right-handed circularly polarized light.
  • the light is folded for the first time.
  • the right-handed circularly polarized light is incident on the second imaging element 3.
  • the optical component 31 folds the right-handed circularly polarized light once.
  • the light is emitted from the second imaging element 3 and enters the aperture 01 for imaging.
  • the number of the optical components 31 may be increased in the second imaging element 3 to increase the number of light refracting times, which may improve imaging clarity.
  • the optical solution of the present application is designed so that the light needs to be refracted at least twice in the entire optical path.
  • the optical component 31 includes at least one of a first liquid crystal film 311 and a second liquid crystal film 312.
  • the second liquid crystal film 312 is configured to reflect circularly polarized light without changing the handedness of the circularly polarized light.
  • the first liquid crystal film 311 is different from the second liquid crystal film 312.
  • the rotation direction of the circularly polarized light will change, for example, left-handed circularly polarized light is converted into right-handed circularly polarized light, or right-handed circularly polarized light is converted into left-handed circularly polarized light.
  • the rotation direction of the circularly polarized light does not change, for example, left-handed circularly polarized light is still left-handed circularly polarized light after reflection, and right-handed circularly polarized light is still right-handed circularly polarized light after reflection.
  • the optical component 31 including a liquid crystal film is introduced into the second imaging element 3 to modulate the handedness of the circularly polarized light.
  • either the first liquid crystal film 311 or the second liquid crystal film 312 can be used in combination with a dichroic film 313 , or the first liquid crystal film 311 and the second liquid crystal film 312 can be used in combination to achieve the desired effect.
  • the optical component 31 includes any one of the first liquid crystal film 311 and the second liquid crystal film 312 , and the optical component 31 A beam splitting film 313 is also included.
  • the first liquid crystal film 311 is disposed on a surface of the first lens 32 close to the first imaging element 2
  • the light-splitting film 313 is disposed on a surface of the first lens 32 close to the first imaging element 2 .
  • the dichroic film 313 is disposed on a surface of the first lens 32 close to the first imaging element 2
  • the first liquid crystal film 311 is disposed on a surface of the first lens 32 close to the first imaging element 2 .
  • the display 1 can directly project linearly polarized light.
  • a linearly polarized light conversion element can also be provided on the light-emitting surface of the display 1 so that the light emitted by the display 1 is linearly polarized light.
  • no optical lens may be used in the first imaging element 2.
  • the polarized reflection element 21 and the phase retarder 22 may be combined together and introduced between the display 1 and the second imaging element 3 through a support.
  • the polarized reflection element 21 and the phase retarder 22 are superimposed and arranged to form an integral part.
  • the superimposed element is disposed on the light emitting surface of the display 1 .
  • the superimposed element formed by the polarized reflection element 21 and the phase retarder 22 may be directly arranged on the light-emitting surface of the display 1. In this way, the introduction of additional supporting members can be omitted, and the optical path structure can be further simplified.
  • the first imaging element 2 further includes a second lens 23 , and the second lens 23 is located between the display 1 and the second imaging element 3 , and the overlapping element is disposed on any surface of the second lens 23 .
  • the superimposed element composed of the polarized reflection element 21 and the phase retarder 22 can be arranged on the introduced lens.
  • Using a lens in the first imaging element 2 is beneficial to improving the imaging quality and reducing the total optical length.
  • the overlapping element is disposed on the surface of the second lens 23 close to the display 1.
  • the surface of the first lens 32 away from the display 1 and the surface of the second lens 23 close to the display 1 are glued or close to each other.
  • the second lens 23 in the first imaging element 2 and the first lens 32 in the second imaging element 3 are close to each other or directly glued together, and the overall optical structure is compact, which is conducive to the lightweight design of the system.
  • the total optical length TTL of the near-eye optical system is ⁇ 15 mm.
  • the thickness of the optical system used in current VR devices is greater than 15mm, which is a certain distance from the glasses.
  • the total optical length of the near-eye optical system provided by the embodiment of the present application can be no more than 15mm, which reduces the thickness of the system while ensuring high-definition imaging.
  • the thickness refers to the dimension of the near-eye optical system along the optical axis.
  • the inverse of the radius a of the surface through which the light passes the most times and the total focal length f of the near-eye optical system satisfy: -1 ⁇ a/f ⁇ 0; wherein the surface of the first lens 32 close to the display 1 is the surface through which the light passes the most times in the near-eye optical system.
  • the surface of the first lens 32 close to the display 1 is the first surface 321.
  • the angle of the light incident on the first surface 321 can be as small as possible, which is beneficial to improving image quality.
  • the near-eye optical system provided according to an embodiment of the present application includes at least one lens, see the first lens 32 shown in FIG. 1 .
  • the optical lenses included in the near-eye optical system use a material with a refractive index n in the range of 1.4 ⁇ n ⁇ 2.0 and a dispersion coefficient v in the range of 20 ⁇ v ⁇ 75.
  • the refractive index n1 of the first lens 32 is 1.54, and the dispersion coefficient v1 is 55.7.
  • the center thickness T1 of the first lens 32 is: 1mm ⁇ T1 ⁇ 14mm .
  • the first lens 3 comprises two optical surfaces, namely a first surface 321 close to the display 1 and a second surface 322 far from the display 1.
  • the first surface 321 and the second surface 322 are aspherical or flat surfaces.
  • the spot diagram refers to a diffuse diagram formed by the intersection of many light rays emitted from a point and the image plane after passing through the near-eye optical system, which is no longer concentrated at the same point due to aberration, but is spread over a certain range. It can be used to evaluate the imaging quality of the near-eye optical system. As shown in FIG9 , the maximum value of the image point in the spot diagram is less than 2 ⁇ m.
  • magnification chromatic aberration is also called magnification chromatic aberration, which mainly refers to the difference between the focal positions of blue light and red light on the image plane, when a complex main light on the object side becomes multiple light rays due to the dispersion of the refraction system when it is emitted on the image side.
  • magnification chromatic aberration As shown in Figure 12, the maximum chromatic aberration value of the near-eye optical system is less than 220 ⁇ m.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)

Abstract

Des modes de réalisation de la présente demande concernent un système optique proche de l'oeil et un dispositif d'affichage porté sur la tête. Le système optique proche de l'oeil comprend un premier élément d'imagerie et un second élément d'imagerie qui sont agencés le long d'un même axe optique. Le premier élément d'imagerie comprend un élément de réflexion de polarisation et un retardateur de phase. Le second élément d'imagerie comprend au moins une lentille et au moins un ensemble optique, et l'ensemble optique est conçu pour être utilisé afin de réfléchir et transmettre sélectivement de la lumière à polarisation circulaire. Selon le système optique proche de l'oeil fourni par les modes de réalisation de la présente invention, un système de RV ultramince peut être obtenu.
PCT/CN2024/110380 2023-09-22 2024-08-07 Système optique proche de l'oeil et dispositif d'affichage porté sur la tête Pending WO2025060719A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202311237836.9A CN117348248A (zh) 2023-09-22 2023-09-22 近眼光学系统以及头戴显示设备
CN202311237836.9 2023-09-22

Publications (1)

Publication Number Publication Date
WO2025060719A1 true WO2025060719A1 (fr) 2025-03-27

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WO (1) WO2025060719A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117348248A (zh) * 2023-09-22 2024-01-05 歌尔光学科技有限公司 近眼光学系统以及头戴显示设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106444046A (zh) * 2016-12-14 2017-02-22 浙江舜通智能科技有限公司 一种光学系统及装配该光学系统的头戴式显示装置
US20170176751A1 (en) * 2014-04-09 2017-06-22 3M Innovative Properties Company Near-eye display system having a pellicle as a combiner
US20200142254A1 (en) * 2017-05-15 2020-05-07 Samsung Electronics Co., Ltd. Imaging device
CN113448101A (zh) * 2021-06-28 2021-09-28 歌尔股份有限公司 光学模组和头戴显示设备
CN218938668U (zh) * 2022-12-20 2023-04-28 江苏瞳芯光学科技有限公司 一种近眼光学成像系统及虚拟现实显示设备
CN116679445A (zh) * 2023-05-31 2023-09-01 歌尔光学科技有限公司 光学模组以及可穿戴设备
CN117348248A (zh) * 2023-09-22 2024-01-05 歌尔光学科技有限公司 近眼光学系统以及头戴显示设备

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170176751A1 (en) * 2014-04-09 2017-06-22 3M Innovative Properties Company Near-eye display system having a pellicle as a combiner
CN106444046A (zh) * 2016-12-14 2017-02-22 浙江舜通智能科技有限公司 一种光学系统及装配该光学系统的头戴式显示装置
US20200142254A1 (en) * 2017-05-15 2020-05-07 Samsung Electronics Co., Ltd. Imaging device
CN113448101A (zh) * 2021-06-28 2021-09-28 歌尔股份有限公司 光学模组和头戴显示设备
CN218938668U (zh) * 2022-12-20 2023-04-28 江苏瞳芯光学科技有限公司 一种近眼光学成像系统及虚拟现实显示设备
CN116679445A (zh) * 2023-05-31 2023-09-01 歌尔光学科技有限公司 光学模组以及可穿戴设备
CN117348248A (zh) * 2023-09-22 2024-01-05 歌尔光学科技有限公司 近眼光学系统以及头戴显示设备

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