WO2021238560A1 - Dispositif d'affichage ar à guide d'ondes ayant un grand angle de champ, et son procédé de mise en œuvre - Google Patents

Dispositif d'affichage ar à guide d'ondes ayant un grand angle de champ, et son procédé de mise en œuvre Download PDF

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Publication number
WO2021238560A1
WO2021238560A1 PCT/CN2021/090574 CN2021090574W WO2021238560A1 WO 2021238560 A1 WO2021238560 A1 WO 2021238560A1 CN 2021090574 W CN2021090574 W CN 2021090574W WO 2021238560 A1 WO2021238560 A1 WO 2021238560A1
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Prior art keywords
waveguide
coupling
polarization
polarization states
grating
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PCT/CN2021/090574
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English (en)
Chinese (zh)
Inventor
王方舟
朱耀明
闫姝君
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深圳惠牛科技有限公司
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Priority claimed from CN202020964598.7U external-priority patent/CN212111991U/zh
Priority claimed from CN202010477897.2A external-priority patent/CN111458886A/zh
Application filed by 深圳惠牛科技有限公司 filed Critical 深圳惠牛科技有限公司
Publication of WO2021238560A1 publication Critical patent/WO2021238560A1/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

  • This application relates to the field of AR display technology, and in particular to a waveguide AR display device with a large field of view and an implementation method thereof.
  • coupling-in components and coupling-out components are required to realize the superposition of the displayed image and the real scene.
  • a common solution is to use gratings for coupling-in components, coupling-out components, and expansion components.
  • the final display field angle is constrained by the following conditions: 1.
  • the refractive index of the waveguide material the larger the refractive index, the larger the angular range that can be totally reflected, and the larger the field of view that can be transmitted; 2.
  • the size of the pupil of the human eye in order to prevent the loss of the image entering the pupil, the image transmission angle should be less than a certain value; 3.
  • the working angle bandwidth of the grating, for angles close to the boundary of the field of view, the diffraction efficiency of the grating may be reduced May cause problems in the display of the edge of the image.
  • the transmission angle ⁇ is about 40°.
  • the purpose of this application is to provide a waveguide AR display device with a large field of view and an implementation method thereof.
  • the technical problem to be solved is how to increase the angle of view.
  • the present application provides a waveguide AR display device with a large field of view, including: a light engine, a waveguide device, a coupling component and a coupling component; the coupling component and the coupling component Are all arranged on the waveguide device;
  • the light engine is used to generate images of at least two polarization states; the coupling component is used to couple the images of the at least two polarization states generated by the light engine into the waveguide device; the waveguide A device for total reflection transmission of the images of the at least two polarization states that are coupled in; the coupling-out component includes coupling-out elements with the same number of polarization states as the image, and the coupling-out element includes coupling-out gratings, It is used to separately couple the images of the at least two polarization states from the waveguide device to form a spliced field of view.
  • the present application provides a waveguide AR display device with a large field of view, including: a light engine, a waveguide device, a coupling component and a coupling component; the coupling component and the coupling component are both arranged in On the waveguide device; the light engine is used to generate images of at least two polarization states; the coupling component is used to couple the images of the at least two polarization states generated by the light engine into the A waveguide device, the coupling component is a transmission coupling component or a reflection coupling component; the waveguide device is used for total reflection transmission of the coupled-in images of the at least two polarization states; the coupling-out A component includes outcoupling elements with the same number of polarization states as the image, the outcoupling elements are arranged next to each other, and the outcoupling components are used to separately couple the images with the at least two polarization states out of the waveguide device , Forming a spliced field of view.
  • the coupling-in component includes a coupling-in grating; the coupling-out grating includes a polarization-sensitive grating.
  • the coupling-in component includes a coupling-in grating
  • the coupling-out element includes a coupling-out grating
  • the coupling-out grating is a polarization-sensitive grating
  • the light engine includes: a light source, at least two LCoS chips, and a polarization beam splitter, the light source provides a light source to the LCoS chip through the polarization beam splitter, and the LCoS chips reflect respectively to generate different polarization states The image of, then passes through the polarization beam splitter to reach the coupling component.
  • the light engine includes: an image source and a polarization modulation device, the image source is used to provide at least two images, and the polarization modulation device is used to convert the at least two images provided by the image source into different polarizations, respectively State image.
  • the polarization modulation device is a polarization rotating wheel.
  • the coupling-in grating is a transmissive grating or a reflective grating
  • the coupling-out grating is a transmissive grating or a reflective grating
  • the waveguide device includes a waveguide plate, and the coupling grating is a non-polarization-sensitive grating or a polarization-sensitive grating.
  • the waveguide device includes a waveguide sheet with the same number of polarization states as the image
  • the coupling grating includes a polarization-sensitive grating with the same number of polarization states as the image.
  • the waveguide sheets with the same number of polarization states as the image are stacked and arranged; the coupling grating with the same number of polarization states as the image is arranged on the corresponding waveguide sheet for generating at least two polarization states by the light engine
  • the images are respectively coupled into the corresponding waveguide plates, and the outcoupling gratings with the same number of polarization states as the images are respectively arranged on the corresponding waveguide plates for separately coupling out the images of the at least two polarization states.
  • the light engine is used to generate images in two polarization states, including an image in the P polarization state and an image in the S polarization state.
  • This application also provides a method for implementing a waveguide AR display device with a large field of view, including the following steps: Step 1: Provide image light sources with at least two polarization states; Step 2: Convert the images with at least two polarization states The light source is coupled into the waveguide device for total reflection transmission; Step 3: The image light sources of the at least two polarization states are respectively coupled out from different positions of the waveguide device; Step 4: The at least two polarizations that are coupled out The images of the different image light sources are spliced together to form a spliced field of view.
  • the manner of providing the image light source of the at least two polarization states includes: providing the image light source of the at least two polarization states through a polarization beam splitting manner or a time division multiplexing manner.
  • separately coupling the image light sources of the at least two polarization states from different positions of the waveguide device includes: separating the image light sources of the at least two polarization states through a polarization sensitive grating disposed on the waveguide device They are respectively coupled out from different positions of the waveguide device.
  • the present application transmits image sources of at least two polarization states through a waveguide device, and then couples out at least two image sources of different polarization states through the use of coupling components, so as to form a field of view splicing effect in the observation space, and then To achieve the purpose of increasing the angle of view of the AR display device.
  • Figure 1 is a schematic diagram of grating waveguide image transmission in the prior art
  • Figure 2 is a schematic diagram of the structure of the application
  • FIG. 3 is a schematic structural diagram of Embodiment 1 of the application.
  • Figure 4 is a schematic structural diagram of Embodiment 2 of the application.
  • FIG. 5 is a schematic structural diagram of Embodiment 3 of the application.
  • FIG. 6 is a schematic structural diagram of Embodiment 4 of this application.
  • the present application provides a waveguide AR display device with a large field of view, including: a light engine 100, a waveguide device 200, a coupling component 300, and a coupling component 400; Both the assembly 300 and the decoupling assembly 400 are arranged on the waveguide device.
  • the light engine 100 is used to generate images in at least two polarization states; the coupling component 300 is used to couple the images in the at least two polarization states generated by the light engine 100 into the waveguide device 200
  • the waveguide device 200 is used for total reflection transmission of the images of the at least two polarization states that are coupled in; the outcoupling component 400 includes the same number of outcoupling elements as the image polarization states for the The images of the at least two polarization states are respectively coupled out from the waveguide device to form a spliced field of view.
  • the present application provides a waveguide AR display device with a large field of view, including: a light engine 100, a waveguide device 200, a coupling component 300 and a coupling component 400; the coupling component 300 and the coupling component
  • the output components 400 are all arranged on the waveguide device.
  • the light engine 100 is used to generate images in at least two polarization states; the coupling component 300 is used to couple the images in the at least two polarization states generated by the light engine 100 into the waveguide device 200 ,
  • the coupling component 300 is a transmissive coupling component or a reflection coupling component;
  • the waveguide device 200 is used for total reflection transmission of the coupled images of the at least two polarization states;
  • the coupling out The component 400 includes outcoupling elements with the same number of polarization states as the image, and the outcoupling elements are arranged next to each other.
  • the outcoupling component 400 is used to separate the images of the at least two polarization states from the waveguide device 200. Coupling in the middle to form a spliced field of view.
  • the form of the light engine 100 can be an LCoS module, an LCD module, an OLED module, a Micro LED module, etc., as long as it can generate images with at least two polarization states;
  • the coupling component 300 as long as it can couple images of at least two polarization states generated by the light engine 100 into the waveguide device 200, the coupling component 300 can include a coupling grating, and the coupling grating can be a non-polarization-sensitive holographic grating or a holographic grating.
  • Polarization-sensitive gratings such as embossed gratings or holographic gratings, can be in the form of transmissive or reflective gratings; the waveguide device 200 only needs to be capable of realizing total reflection transmission of the coupled image; the out-coupling component 400 as long as the at least two polarization state images in the waveguide device 200 can be separately coupled out to form a spliced field of view.
  • the outcoupling component 400 may include: outcoupling gratings with the same number of polarization states as the image, and the outcoupling grating specifically adopts the same number of polarization-sensitive gratings as the polarization state image, such as a polarization-sensitive holographic grating or relief grating, Since the polarization-sensitive grating can couple out images of different polarization states at different angles, the splicing of the two fields of view can be realized during coupling out, so as to achieve the effect of increasing the field of view.
  • the form of the light engine 100 can be an LCoS module, an LCD module, an OLED module, a Micro LED module, etc., as long as it can generate images in at least two polarization states; the coupling component It is sufficient for 300 to couple images of at least two polarization states generated by the light engine 100 into the waveguide device 200.
  • the coupling component 300 may include a coupling grating, and the coupling grating may specifically include a polarization-sensitive grating or a non-polarization grating.
  • Sensitive gratings such as embossed gratings or holographic gratings, can be in the form of transmissive or reflective gratings; the waveguide device 200 only needs to be capable of realizing the coupled image for total reflection transmission; the out-coupling component 400 As long as the at least two polarization state images in the waveguide device 200 can be separately coupled out to form a spliced field of view.
  • the outcoupling component 400 may include: outcoupling gratings with the same number of polarization states as the image, and the outcoupling grating specifically adopts the same number of polarization-sensitive gratings as the polarization state image, such as a polarization-sensitive holographic grating or relief grating, Since the polarization-sensitive grating can couple out images of different polarization states at different angles, the splicing of the two fields of view can be realized during coupling out, so as to achieve the effect of increasing the field of view.
  • the light engine 100 provides images of at least two polarization states
  • the coupling component 300 couples the images of the at least two polarization states into the waveguide device 200 for total reflection transmission.
  • the images of each polarization state respectively satisfy the above-mentioned field angle constraints.
  • the coupling-out component 400 can couple the images of different polarization states at different angles, and realize the field of view during coupling out. Splicing, so as to achieve the effect of increasing the field of view.
  • FIG. 3 is a schematic diagram of the structure of the first embodiment of the application.
  • the number of polarization images is 2, and the light engine provides two images with different polarization states.
  • the light engine in this embodiment specifically includes a light source 11, a first LCoS chip 13, a second LCoS chip 14 and a polarization beam splitter 12.
  • the light generated by the light source 11 passes through the polarizing beam splitter 12 to reach the first LCoS chip 13 and the second LCoS chip 14 respectively, and the first LCoS chip 13 and the second LCoS chip 14 are respectively reflected to generate two polarizations
  • the image of the state then passes through the polarization beam splitter 14 to reach the coupling component 3a.
  • the waveguide device 2a is a piece of waveguide sheet in this embodiment, the coupling component 3a is provided at one end of the waveguide sheet, and the coupling component 4a is provided at the other end of the waveguide sheet.
  • the coupling component 3a can be selected as a non-polarization-sensitive grating that acts on images of two polarization states at the same time; or two different gratings can be respectively coupled to images of corresponding polarization states, such as a polarization-sensitive grating.
  • the coupling-out component 4a is two coupling-out gratings, specifically two polarization-sensitive gratings.
  • the coupling-in component 3a couples images of both polarization states into the waveguide device 2a for transmission, and then passes through the coupling
  • the output component 4a couples images of two polarization states to form a field of view splicing effect in the observation space, thereby increasing the angle of view, and the two coupling out gratings of the coupling component 2 are arranged next to each other to achieve seamless connection.
  • the displayed pictures can achieve the effect of seamless splicing, and the user experience can be improved.
  • FIG. 3 is a schematic structural diagram of the first embodiment of the application.
  • the number of polarization images is 2, and the light engine provides two images with different polarization states using polarization splitting.
  • the light engine in this embodiment specifically includes a light source 11, a first LCoS chip 13, a second LCoS chip 14 and a polarization beam splitter 12.
  • the light generated by the light source 11 passes through the polarizing beam splitter 12 to reach the first LCoS chip 13 and the second LCoS chip 14 respectively, and the first LCoS chip 13 and the second LCoS chip 14 are respectively reflected to generate two polarizations
  • the image of the state then passes through the polarization beam splitter 14 to reach the coupling component 3a.
  • the waveguide device 2a is a piece of waveguide sheet in this embodiment, the coupling component 3a is provided at one end of the waveguide sheet, and the coupling component 4a is provided at the other end of the waveguide sheet.
  • the coupling component 3a can be selected as a non-polarization-sensitive grating that acts on images of two polarization states at the same time; or two different gratings can be respectively coupled to images of corresponding polarization states, such as a polarization-sensitive grating.
  • the presentation form of the coupled grating can be a holographic grating or a relief grating.
  • the coupling-out component 4a is two coupling-out gratings, specifically two polarization-sensitive gratings.
  • the coupling-in component 3a couples images of both polarization states into the waveguide device 2a for transmission, and then passes through the coupling
  • the output component 4a couples images of two polarization states to form a field of view splicing effect in the observation space, thereby increasing the angle of view, and the two coupling out gratings of the coupling component 2 are arranged next to each other to achieve seamless connection.
  • the displayed pictures can achieve the effect of seamless splicing, and the user experience can be improved.
  • this application also provides a second embodiment.
  • the difference lies in that the light engine adopts a time-division multiplexing mode, which specifically includes: image source 15 and polarization Modulation device.
  • the polarization modulation device is a polarization wheel 16.
  • the image source 15 provides two images in the form of a high frame rate.
  • the two ends of the polarization wheel 16 are respectively two polarizers with different polarization states.
  • the polarization wheel 16 rotates to modulate the two images.
  • the rotation frequency of the polarization wheel 16 is consistent with the frequency of the two images with different polarization states provided by the image source 15 switching, so that one of the images is in one polarization state, and the other is in the other polarization state.
  • the images of the two polarization states are then coupled into the waveguide device 2b via the coupling-in component 3b, and finally coupled out via the coupling-out component 4b.
  • the specific principle is the same as that of the first embodiment, and will not be repeated here.
  • the waveguide device 2 is a piece of waveguide sheet, which is used to transmit images of two polarization states at the same time, which can improve the display effect as much as possible with a smaller lens thickness, and is used as a coupling
  • the coupling grating can be selected as a relief grating or a holographic grating.
  • the present application also provides a third embodiment.
  • the light engine 100a provides images of two polarization states.
  • the waveguide device includes a first waveguide sheet 21 and a second waveguide sheet that are stacked. 22.
  • the coupling-in component includes a first coupling-in grating 31 and a second coupling-in grating 32
  • the coupling-out component includes a first coupling-out grating 41 and a second coupling-out grating 42.
  • the first coupling-in grating 31, the second coupling-in grating 32, the first coupling-out grating 41, and the second coupling-out grating 42 are all polarization-sensitive gratings.
  • the first coupling-in grating 31 and the first coupling-out grating 41 are both disposed on the first waveguide sheet 21, and are respectively disposed on both ends of the first waveguide sheet 21, and are disposed on the first waveguide sheet 21 is close to the human eye side;
  • the second coupling-in grating 32 and the second coupling-out grating 42 are both provided on the second waveguide sheet 22, and are respectively provided on both ends of the second waveguide sheet 22, and are provided On the side of the first waveguide sheet 21 close to the human eye; the projections of the two coupling-out gratings on the side close to the human eye are arranged next to each other.
  • the first coupling grating 31 is used for coupling one of the two polarization state images into the first waveguide sheet 21, and the second coupling grating 32 is used for coupling the other polarization state image into the other polarization state image.
  • An image is coupled into the second waveguide sheet 22.
  • the first waveguide sheet 21 and the second waveguide sheet 22 are respectively used for total reflection transmission of a corresponding polarization state image.
  • the first coupling-out grating 41 and the first The two out-coupling gratings 42 are respectively used to couple out the images in the corresponding waveguide sheet and form a spliced field of view.
  • the light engine 100b provides images with three different polarization states
  • the coupling component includes a first coupling grating 33 and a second coupling
  • the in-coupling grating 34 and the third in-coupling grating 35, the out-coupling components include a first out-coupling grating 43, a second out-coupling grating 44, and a third out-coupling grating 45, and both the in-coupling grating and the out-coupling grating are polarized Sensitive gratings work only for one polarization state.
  • the waveguide device includes a first waveguide sheet 23, a second waveguide sheet 24, and a third waveguide sheet 25 that are stacked, and the first in-coupling grating 33 and the first out-coupling grating 43 are all provided on the first waveguide sheet.
  • the second coupling-in grating 34 and the second coupling-out grating 44 are both provided on the second waveguide sheet 24, and the third coupling-in grating 35 and the third coupling-out grating 25 are both provided on the
  • the third wave guide plate 25 is set, the first out-coupling grating 43, the second out-coupling grating 44, and the third out-coupling grating 45 are arranged next to each other on the side close to the human eye.
  • images of this polarization state are coupled into a corresponding piece of waveguide film, and then transmitted through the waveguide film and then coupled out by the corresponding coupling out grating to form a spliced field of view.
  • images with three different polarization states can be transmitted through three channels respectively.
  • the polarization state image provided by the light engine may also be a polarization beam splitting manner or a time division multiplexing manner.
  • the waveguide sheet in this application can be made of conventional materials such as glass or resin.
  • the out-coupling gratings are all made of polarization-sensitive materials, and a kind of out-coupling grating only works for one polarization state.
  • the coupling grating in this application can be selected as a transmissive grating, in this case the coupling grating is located on the side of the waveguide sheet closer to the human eye, or the coupling grating can be selected as a reflective grating located on the waveguide sheet The side relatively far away from the human eye; or the coupling-out grating can also be a reflective grating.
  • the coupling-out grating is located on the side of the waveguide that is relatively far away from the human eye, or the coupling-out grating can also be a transmissive grating. The grating is located on the side of the waveguide sheet closer to the human eye.
  • the coupling-out grating can be a reflective grating or a transmissive grating; when the coupling-in grating is a reflective grating, the coupling-out grating can be a reflective grating or a transmissive grating.
  • the two polarization images when the number of polarization images provided by the light engine is 2, the two polarization images can be P polarization images and S polarization images, respectively.
  • This application also provides a method for implementing a waveguide AR display device with a large field of view, which includes: Step 1: Provide image light sources with at least two polarization states; the method for providing the image light sources with at least two polarization states includes: Provide the image light source of the at least two polarization states by means of polarization or time division multiplexing Step 2: Coupling the image light source of the at least two polarization states into a waveguide device for total reflection transmission; Step 3: Transmit the at least two polarization states The image light sources of the two polarization states are respectively coupled out from different positions of the waveguide device; step 4: splicing the images of the image light sources of the at least two polarization states that are coupled together to form a spliced field of view.
  • the manner of providing the image light source of the at least two polarization states in the step 1 includes: providing the image light source of the at least two polarization states through a polarization manner or a time division multiplexing manner.
  • the polarization beam splitting mode and the time division multiplexing mode have been described in detail in the foregoing, and will not be repeated here.
  • step 3 coupling the image light sources of the at least two polarization states from different positions of the waveguide device respectively includes: separating the image light sources of the at least two polarization states through a polarization sensitive grating disposed on the waveguide device.
  • the image light sources are respectively coupled out from different positions of the waveguide device.
  • polarization-sensitive gratings such as polarization-sensitive holographic gratings or relief gratings, because polarization-sensitive gratings can couple images of different polarization states at different angles, the two fields of view can be spliced during coupling, so as to achieve The effect of increasing the field of view.
  • image light sources of at least two polarization states can be coupled out to achieve a field of view splicing effect, thereby achieving the effect of increasing the field of view.
  • the present application transmits image sources of at least two polarization states through the waveguide device, and then couples image sources of at least two different polarization states through the coupling component, which can form a field of view splicing effect in the observation space, which is helpful To increase the angle of view.

Abstract

L'invention concerne un dispositif d'affichage AR à guide d'ondes ayant un grand angle de champ, et son procédé de mise en œuvre. Le dispositif d'affichage AR à guide d'ondes comprend : un moteur optique (100), un dispositif de guide d'ondes (200), un ensemble d'accouplement (300), et un ensemble de sortie (400) ; l'ensemble de couplage (300) et l'ensemble de sortie (400) sont tous deux disposés sur le dispositif de guide d'ondes (200) ; le moteur optique (100) est configuré pour générer des images d'au moins deux états de polarisation ; l'ensemble de couplage (300) est configuré pour coupler les images des au moins deux états de polarisation générés par le moteur optique (100) dans le dispositif de guide d'ondes (200) ; le dispositif de guide d'ondes (200) est configuré pour effectuer une transmission de réflexion totale sur les images couplées d'au moins deux états de polarisation ; l'ensemble de sortie (400) comprend des éléments de couplage ayant la même quantité que les états de polarisation d'image, et l'ensemble de sortie (400) est configuré pour coupler séparément les images des au moins deux états de polarisation du dispositif de guide d'ondes (200) séparément pour former un champ de vision épissé. Des sources d'image dans au moins deux états de polarisation sont transmises au moyen du dispositif de guide d'ondes (200), puis les sources d'image dans au moins deux états de polarisation différents sont couplées séparément par l'intermédiaire de l'ensemble de sortie (400), de telle sorte qu'un champ d'effet d'épissage de vue peut être obtenu, et l'angle de champ peut être augmenté.
PCT/CN2021/090574 2020-05-29 2021-04-28 Dispositif d'affichage ar à guide d'ondes ayant un grand angle de champ, et son procédé de mise en œuvre WO2021238560A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN202020964598.7U CN212111991U (zh) 2020-05-29 2020-05-29 一种具有大视场角的波导ar显示器件
CN202010477897.2 2020-05-29
CN202010477897.2A CN111458886A (zh) 2020-05-29 2020-05-29 一种具有大视场角的波导ar显示器件及其实现方法
CN202020964598.7 2020-05-29

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CN111007589A (zh) * 2018-10-08 2020-04-14 成都理想境界科技有限公司 一种波导模组、基于波导的显示模组及近眼显示设备
CN110045503A (zh) * 2019-03-29 2019-07-23 北京蚁视科技有限公司 一种基于全反射的紧凑型大视场角近眼显示装置
CN111458886A (zh) * 2020-05-29 2020-07-28 深圳惠牛科技有限公司 一种具有大视场角的波导ar显示器件及其实现方法
CN212111991U (zh) * 2020-05-29 2020-12-08 深圳惠牛科技有限公司 一种具有大视场角的波导ar显示器件

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