WO2021115344A1 - Module d'affichage optique ra et dispositif de réalité augmentée - Google Patents

Module d'affichage optique ra et dispositif de réalité augmentée Download PDF

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Publication number
WO2021115344A1
WO2021115344A1 PCT/CN2020/134996 CN2020134996W WO2021115344A1 WO 2021115344 A1 WO2021115344 A1 WO 2021115344A1 CN 2020134996 W CN2020134996 W CN 2020134996W WO 2021115344 A1 WO2021115344 A1 WO 2021115344A1
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WIPO (PCT)
Prior art keywords
light
polarized light
display module
linearly polarized
component
Prior art date
Application number
PCT/CN2020/134996
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English (en)
Chinese (zh)
Inventor
左惟涵
周知星
张韦韪
Original Assignee
深圳惠牛科技有限公司
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.)
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Publication date
Priority claimed from CN201911269734.9A external-priority patent/CN111025638A/zh
Priority claimed from CN201911268580.1A external-priority patent/CN110927970B/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 WO2021115344A1 publication Critical patent/WO2021115344A1/fr

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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

Definitions

  • This application relates to a display device, in particular to an AR optical display module and an augmented reality device.
  • Augmented Reality (AR) technology is a new technology that "seamlessly" integrates real-world information and virtual world information. It combines entities that are difficult to experience within a certain time and space of the real world. Information (visual information, sound, taste, touch, etc.) is superimposed through computer and other science and technology to simulate and then apply virtual information to the real world and be perceived by the human senses to achieve a sensory experience beyond reality. That is, the real environment and virtual objects are superimposed on the same screen or space in real time.
  • Information visual information, sound, taste, touch, etc.
  • FIG. 1 shows a schematic structural diagram of an AR optical display module in an existing AR glasses or AR display device.
  • the optical system of the existing AR display device includes an image source 11, a beam splitter 3, a curved half mirror 4 and a lens 19 located above the beam splitter 3.
  • the image light emitted by the image source 11 enters the lens 19 downward.
  • the image light collimated by the lens 19 enters the beam splitter 3. Part of the image light is reflected by the beam splitter 3 and directed toward the curved half mirror 4, and part of the light is reflected by the curved half mirror 4 and directed toward the beam splitter 3.
  • ambient light exital effective light
  • part of the image light and part of the ambient light eventually reach the human eye at the same time, so that the user can see the outside In the real environment, you can also see the image light superimposed in the real environment.
  • the interference light (external stray light) also enters from below the beam splitter 3 upwards, and part of the interference light is reflected by the beam splitter 3 and reaches the human eye. . That is, while viewing the image light and the external environment light, the user will also see the interference light incident from the outside at the same time, thereby reducing the user's viewing experience.
  • the purpose of this application is to overcome the shortcomings of the prior art and provide an AR optical display module and an augmented reality device to solve the problem that external stray light enters the human eye and affects the user's viewing experience.
  • the purpose of the present application is also to provide an augmented reality device to solve the problem of the existing augmented reality device that affects the user's viewing experience due to the presence of stray light from the outside.
  • this application also provides an AR optical display module with the functions of preventing theft and eliminating external stray light. While ensuring that there will be no leakage of user viewing information, it also provides It can solve the problem that external stray light enters the human eye and affects the user's viewing experience.
  • this application also provides an augmented reality device. While ensuring that no light leakage occurs, it can also solve the problem that external stray light enters the human eye and affects the user’s viewing experience. .
  • the present application provides an AR optical display module, including: a polarization component and a first transflective component arranged in sequence along an optical path; the polarization component is used to reflect incident image light to the first transflective component, the The first transflective component is used to reflect the image light and transmit external effective light; the image light reflected by the first transflective component and the external effective light transmitted reach the polarization component, and pass through the polarization The component enters the human eye after transmission; the polarization component is also used to absorb incident external stray light.
  • the polarization assembly includes: an absorbing polarizer, a retardation element, and a second transflective component arranged in sequence; the second transflective component is located on the side adjacent to the first transflective component, and the absorptive polarizer The sheet is located on the side away from the first transflective part.
  • the retarder is used to convert incident linearly polarized light into circularly polarized light or elliptically polarized light.
  • the retardation element is a quarter wave plate.
  • the absorbing polarizer and the retarder are both attached to the second transflective component.
  • first transflective component and the second transflective component both include a substrate, and a transflective film is plated on one side of the substrate, and an antireflection film is plated on the other side of the substrate. membrane.
  • the first transflective part is a curved transflective mirror.
  • the AR optical display module further includes: an image unit for generating the image light; the image unit and the polarization component form an acute angle.
  • the AR optical display module further includes: a lens unit arranged between the image unit and the polarizing component for correcting the aberration of the image light generated by the image unit, and the lens The unit is coaxially arranged with the image unit.
  • the present application also provides an augmented reality device, including the AR optical display module described in any one of the above.
  • An AR optical display module comprising: a polarization component and a polarization component arranged in sequence along an optical path; the polarization component is used to reflect incident linear image light to the polarization component, and the polarization component is used to reflect the linear The image light and the transmitted external effective light; the linear image light reflected by the polarizer and the transmitted external effective light reach the polarization component, and enter the human eye after being transmitted through the polarization component; the polarization component is also used to absorb incident light Outside stray light.
  • the polarization component includes: an absorbing polarizer, a retarder, and a transflective component arranged in sequence; the transflective component is located on the side adjacent to the polarizer, and the absorptive polarizer is located far away from the polarizer.
  • the incident linear image light is first linearly polarized light
  • the absorbing polarizer is used to transmit the first linearly polarized light and reflect the second linearly polarized light
  • the polarizer is used to reflect the first linearly polarized light.
  • a linearly polarized light transmits the second linearly polarized light, and the first linearly polarized light and the second linearly polarized light are orthogonal to each other.
  • the retarder is used to convert incident linearly polarized light into circularly polarized light or elliptically polarized light.
  • the retardation element is a quarter wave plate.
  • both the absorbing polarizer and the retarder are attached to the transflective component.
  • the polarizer is a curved polarizer.
  • the AR optical display module further includes: an image unit disposed above the polarizing component, for generating circularly polarized light or elliptically polarized light, the second linearly polarized light or the first linearly polarized light ;
  • the AR optical display module further includes: a polarizing unit arranged between the image unit and the polarizing component for The circularly polarized light or the elliptically polarized light generated by the image unit is converted into the first linearly polarized light, and the image unit and the polarizing unit are arranged coaxially;
  • the AR optical display module further includes: a wave plate unit arranged between the image unit and the polarization component, and is used to transfer the image
  • the second linearly polarized light generated by the unit is converted into the first linearly polarized light
  • the image unit is coaxially arranged with the wave plate unit.
  • the image unit and the polarization component form an acute angle.
  • the AR optical display module further includes: a lens unit arranged between the image unit and the polarizing component for correcting the first linearly polarized light, the first linearly polarized light, or the second linearly polarized light For the aberration of light, the lens unit and the image unit are coaxially arranged.
  • the present application also provides an augmented reality device, including the AR optical display module described in any one of the above.
  • the AR optical display module and augmented reality device achieved the elimination of external stray light by analyzing the characteristics of external stray light, using the ingenious optical path design of absorbing polarizers, retarders, and mirrors. Improve the contrast between the light (image light and external effective light) required by the user and the external stray light, thereby improving the user's viewing experience when using the AR optical display module.
  • the AR optical display module and augmented reality device achieved the elimination of external stray light by using the ingenious optical path design of the absorbing polarizer, the retardation part and the transflector through the cooperation of the polarizing component and the polarizing part. , The purpose of preventing the light leakage of the image viewed by the user, improving the contrast between the light required by the user (image light and external effective light) and the external stray light, and then improving the viewing experience of the user when using the AR optical display module.
  • FIG. 1 is a schematic diagram of the structure of an AR optical display module in the prior art.
  • FIG. 2 is a schematic structural diagram of an embodiment of the AR optical display module provided by the present application.
  • FIG. 3 is a schematic structural diagram of the first embodiment of the AR optical display module provided by this application.
  • FIG. 4 is a schematic structural diagram of a second embodiment of the AR optical display module provided by this application.
  • FIG. 5 is a schematic structural diagram of another embodiment of the AR optical display module provided by this application.
  • the application provides an AR optical display module and an augmented reality device including the AR optical display module.
  • the AR optical display module includes:
  • the polarization component 2 and the transflective component 3 are arranged in sequence along the optical path.
  • the polarization component 2 is used to reflect the incident image light L1 to the transflective component 3.
  • the transflective component 3 is used to reflect the image light L1 and transmit ambient light from the real external environment (the ambient light is the light required by the user, and is referred to as the external effective light L2 in the embodiment of the present application); the transflective component 3
  • the reflected image light L1 and the transmitted external effective light L2 reach the polarizing component 2, and enter the human eye at the same time after being transmitted through the polarizing component 2, so that the user can see the real external environment while also seeing the image light superimposed in the real environment , So as to achieve the augmented reality effect.
  • the polarization component 2 Absorption, which can effectively eliminate external stray light, improve the contrast between the light (image light and external effective light) required by the user and the external stray light, thereby enhancing the user's viewing experience when using the AR optical display module.
  • the polarization component 2 may include:
  • the absorbing polarizer 201, the retardation 202 and the transflective component 203 are arranged in sequence; the transflective component 203 is located on the side close to the transflective component 3, and the absorptive polarizer 201 is located on the side away from the transflective component 3.
  • the function of the absorbing polarizer 201 is to transmit light in the first polarization state and absorb light in the second polarization state.
  • the light of the first polarization state and the light of the second polarization state are orthogonal to each other.
  • the light in the first polarization state is P linearly polarized light
  • the light in the second polarization state may be S linearly polarized light.
  • the light in the second polarization state may be P linearly polarized light.
  • the function of the retarder 202 is to convert incident linearly polarized light into circularly polarized light or elliptically polarized light, for example, to convert P linearly polarized light into circularly polarized light or elliptically polarized light, or to convert S linearly polarized light into Circularly polarized light or elliptically polarized light, wherein the retarder 202 may specifically be a 1/4 wavelength wave plate.
  • both the absorbing polarizer 201 and the retarder 202 can be attached to the transflective component 203, which can reduce the thickness of the AR light display module to a certain extent.
  • the transflective part 3 and the transflective part 203 may be transflective mirrors.
  • the specific structure of the transflective mirror can be: a substrate, and a functional film is plated on one side of the substrate to make it have a certain transmittance and reflection effect, and an antireflection coating is plated on the other side of the substrate to reduce the reflection from the interface The stray light brought by.
  • the transflective component 3 may be a curved lens, and the purpose of selecting the curved surface is to increase the angle of view and correct aberrations, thereby improving image imaging quality and display effect.
  • the absorbing polarizer 201 transmits light in the first polarization state and absorbs light in the second polarization state as an example, the working process of the AR optical display module in the embodiment of the present application will be described in detail.
  • the incident image light L1 After the incident image light L1 enters the transflective component 203 with a certain transmittance, part of the light is reflected to the transflective component 3, and then is reflected back to the transflective component 203. At this time, part of the light is transmitted from the transflective component 203 , And pass through the retarder 202 and the absorbing polarizer 201 in sequence, and then enter the human eye, so that the human eye can see the image light L1.
  • the external effective light L2 from the external environment sequentially passes through the transflective component 3, the transflective component 203, the retarder 202 and the absorbing polarizer 201, and then enters the human eye. At this time, the user can see the external real environment while also seeing the image light superimposed in the real environment to achieve an augmented reality effect.
  • the natural light passes through the absorbing polarizer 201, the retardation 202, and the transflective component 203 of the polarizing component 2 in turn.
  • the polarizer 201 only the light with the first polarization state can pass through, and the light with the second polarization state is absorbed.
  • the light with the first polarization state passes through the retarder 202 and becomes circularly polarized light or elliptically polarized light.
  • And pass through the transflective component 203 with a certain transmittance part of the light is reflected and then passes through the retarder 202 again.
  • the circularly polarized light or the elliptically polarized light becomes the light of the second polarization state, and becomes the light of the second polarization state. It is absorbed when it passes through the absorbing polarizer 201 again, thereby eliminating the external stray light, thereby improving the contrast between the light (image light and external effective light) required by the user and the external stray light, thereby enhancing the user’s use of AR optical display modules.
  • the AR optical display module further includes: an image unit 1 for generating image light.
  • the image unit 1 is disposed above the polarization component 2 and forms an acute angle with the polarization component 2. In this way, the image light L1 generated by the image unit 1 can reach the polarizing component 2.
  • the image unit 1 in the present application is a display device capable of providing image information, and may be a display unit such as LCD, OLED, micro-LED, LCoS, etc.
  • the AR optical display module may further include: a lens unit (not shown) arranged between the image unit 1 and the polarizing component 2, and its function is to correct the aberration of the image light generated by the image unit 1 ,
  • the lens unit and the image unit 1 are coaxially arranged, and the corrected image unit 1 is incident on the polarization component 2.
  • the image light L1 generated by the image unit 1 is refracted by the lens unit and then enters the polarization component 2.
  • the image light L1 enters the transflective part 203
  • part of the light is reflected to the transflective part 3, and then is reflected by the transflective part 3 back to the transflective part 203.
  • part of the light is transmitted from the transflective part 203, and in turn After passing through the retarder 202 and the absorbing polarizer 201, it enters the human eye, so that the human eye can see the image light L1.
  • the external effective light L2 from the external environment sequentially passes through the transflective part 3, the transflective part 203, the retardation part 202, and the absorbing polarizer 201, and then enters the human eye.
  • the user can see the external real environment while also seeing the image light superimposed in the real environment to achieve an augmented reality effect.
  • the natural light passes through the absorbing polarizer 201, retarder 202 and the transflective component 203 of the polarizing component 2 in turn.
  • the polarizer 201 only the light with the first polarization state can pass through, and the light with the second polarization state is absorbed.
  • the light with the first polarization state passes through the retarder 202 and becomes circularly polarized light or elliptically polarized light.
  • the circularly polarized light or the elliptically polarized light becomes the light of the second polarization state, and becomes the light of the second polarization state. It is absorbed when it passes through the absorbing polarizer 201 again, thereby eliminating the external stray light, thereby improving the contrast between the light (image light and external effective light) required by the user and the external stray light, thereby enhancing the user's use of AR optical display modules Time of viewing experience.
  • the transflective part 3 is named the first transflective part 3
  • the transflective part 203 is named the second transflective part 203.
  • the AR optical display module and augmented reality display device provided by this application, through the analysis of the characteristics of the external stray light, use the ingenious optical path design of the absorption polarizer, retardation element, and transflector to achieve Eliminate external stray light, improve the contrast between the light (image light and external effective light) required by the user and the external stray light, thereby enhancing the user's viewing experience when using the AR optical display module.
  • the application provides an AR optical display module and an augmented reality display device including the AR optical display module.
  • the AR optical display module includes:
  • the polarizing component 2 and the polarizing member 3 are arranged in sequence along the optical path.
  • the polarizing component 2 is used to reflect the incident image light L1 to the polarizing member 3.
  • the image light L1 is a linear image light.
  • the polarizer 3 has the functions of reflecting the linear image light L1 and transmitting the ambient light from the external real environment (the ambient light is the light required by the user, and is referred to as the external effective light L2 in the embodiment of the present application). After the polarizing element 3 reflects the linear image light L1 and transmits the external effective light L2, the linear image light L1 reflected by the polarizing element 3 and the transmitted external effective light L2 reach the polarizing element 2, and then pass through the polarizing element 2 to enter the person at the same time.
  • Eyes enable users to see the real environment outside while also seeing the image light superimposed in the real environment, so as to achieve an augmented reality effect. Since the image light is linearly polarized light, after it reaches the polarizer 3, it will only be reflected back to the polarizing component 2 and will not be transmitted from the polarizer 3. Therefore, there will be no leakage of the information viewed by the user. Can effectively protect the privacy of users.
  • the ambient light incident from below the polarizing component 2 (the ambient light is light that is not required by the user, and is referred to as interference light L3 or external stray light L3 in the embodiment of the present application) after reaching the polarizing component 2, the polarized component 2 Absorption, which can effectively eliminate the external stray light, improve the contrast between the light (image light and external effective light) required by the user and the external stray light, thereby effectively protecting the user’s privacy while also improving the user’s use of AR optics The viewing experience when displaying the module.
  • the ambient light incident from below the polarizing component 2 the ambient light is light that is not required by the user, and is referred to as interference light L3 or external stray light L3 in the embodiment of the present application
  • the polarized component 2 Absorption which can effectively eliminate the external stray light, improve the contrast between the light (image light and external effective light) required by the user and the external stray light, thereby effectively protecting the user’s privacy while also improving the user’s use of AR
  • the polarization component 2 may include:
  • the absorbing polarizer 201, the retardation 202 and the transflective component 203 are arranged in sequence; the transflective component 203 is located on the side adjacent to the polarizer 3, and the absorbing polarizer 201 is located on the side away from the polarizer 3.
  • the function of the absorbing polarizer 201 is to transmit light with the first polarization state, that is, to transmit the first linearly polarized light; to absorb the light with the second polarization state, that is, to absorb the second linearly polarized light.
  • the polarizer 3 reflects the first linearly polarized light and transmits the second linearly polarized light.
  • the first linearly polarized light and the second linearly polarized light are orthogonal to each other.
  • the first linearly polarized light is P linearly polarized light
  • the second linearly polarized light may be S linearly polarized light.
  • the first linearly polarized light is S linearly polarized light
  • the second linearly polarized light may be P linearly polarized light.
  • the function of the retarder 202 is to convert incident linearly polarized light into circularly polarized light or elliptically polarized light, for example, to convert P linearly polarized light into circularly polarized light or elliptically polarized light, or to convert S linearly polarized light. It is circularly polarized light or elliptically polarized light.
  • the retarder 202 may be a 1/4 wavelength wave plate.
  • both the absorbing polarizer 201 and the retarder 202 can be attached to the transflective component 203, which can reduce the thickness of the AR optical display module to a certain extent.
  • the transflective component 203 is a component with a function of partial transmission and partial reflection.
  • the transflective component 203 may specifically be a transflective mirror.
  • the structure of the transmission mirror can be: a substrate, and a functional film is plated on one side of the substrate to make it have a certain transmittance and reflection effect, and an antireflection coating is plated on the other side of the substrate to reduce the reflection band caused by the interface. Stray light coming.
  • the transflective component 203 may specifically be a plane lens.
  • the polarizing part 3 may be specifically a curved polarizing part, and the purpose of selecting the curved surface is to increase the angle of view and correct aberrations.
  • the absorbing polarizer 201 transmits the first linear polarized light and absorbs the second linear polarized light as an example, the working process of the AR optical display module of the embodiment of the present application will be described in detail. description.
  • the incident image light L1 is the first linearly polarized light. After the first linearly polarized light is incident on the transflective component 203 with a certain transmittance, part of the light is reflected to the polarizer 3, because the polarizer 3 has the first linear polarized light to reflect The function of transmitting the second linearly polarized light. When the first linearly polarized light enters the polarizing part 3, it will only be reflected by the polarizing part 3 back to the transflective part 203, and will not be transmitted by the polarizing part 3, so no image light will occur. The situation of leakage to the external environment solves the problem of light leakage, thereby effectively protecting the privacy of users.
  • part of the first linearly polarized light returned to the transflective part 203 will be transmitted from the transflective part 203.
  • the polarization state of the light will not change and continue to propagate to the retarding part 202.
  • the retarder 202 since the retarder 202 has the function of converting linearly polarized light into circularly polarized light or elliptically polarized light, the first linearly polarized light will become elliptical or circularly polarized light and enter the absorbing polarizer. 201, and enter the human eye after being transmitted through the absorbing polarizer 201, so that the human eye can see the first linearly polarized light L1.
  • the external effective light L2 from the external environment is natural light, including the first linearly polarized light and the second linearly polarized light.
  • the polarizer 3 has the functions of reflecting the first linearly polarized light and transmitting the second linearly polarized light, after the external effective light L2 passes through the polarizing component 3, only the second linearly polarized light is transmitted and enters the polarizing component 2.
  • the incoming second linearly polarized light first passes through the transflective part 203 with a certain transmittance, and part of the light passes through the retarder 202 to become elliptical or circularly polarized light and then enters the absorbing polarizer 201.
  • the elliptical or circularly polarized light includes the first
  • the linearly polarized light enters the human eye after being transmitted through the absorbing polarizer 201. At this time, the user can see the external real environment while also seeing the image light superimposed in the real environment, thereby achieving an augmented reality effect.
  • the absorption polarizer 201 Since the absorption polarizer 201 has the function of transmitting the first linearly polarized light and reflecting the second linearly polarized light, when natural light passes through the absorption polarizer 201, only the first linearly polarized light can pass through and the second linearly polarized light After being absorbed, the first linearly polarized light will become circularly polarized or elliptically polarized light after passing through the retarder 202, and will pass through the transflective component 203 with a certain transmittance. Part of the light will pass through the retarder 202 again after being reflected.
  • the circularly polarized light or the elliptically polarized light becomes the second linearly polarized light, and the second linearly polarized light is absorbed when passing through the absorbing polarizer 201, thereby eliminating the external stray light, thereby achieving the improvement of the light required by the user (image light and external light). Effective light) and the external stray light contrast, thereby enhancing the user’s viewing experience when using the AR optical display module.
  • the AR optical display module may also include an image unit 1 for generating image light.
  • the light emitted by the image unit 1 may be first linearly polarized light, may also be second linearly polarized light, or may be circularly polarized light or elliptically polarized light.
  • the light emitted by the image unit 1 is the first linearly polarized light
  • the light emitted by the image unit 1 can be incident on the polarization component 2 without conversion, which will be described in detail through the embodiment shown in FIG. 3.
  • a wave plate unit needs to be used to convert the second linearly polarized light into the first linearly polarized light, which will be described in detail later through the embodiment shown in FIG. 4.
  • the AR optical display module further includes: an image unit 1 for generating first linearly polarized light.
  • the image unit 1 is disposed above the polarization component 2 and forms an acute angle with the polarization component 2. In this way, the first linearly polarized light L1 generated by the image unit 1 can reach the polarization component 2.
  • the image unit 1 in this application is a display device capable of providing image information, and specifically may be a display unit such as LCD, OLED, micro-LED, and LCoS.
  • the AR optical display module may further include: a lens unit (not shown) arranged between the image unit 1 and the polarizing component 2, and its function is to correct the image of the first linearly polarized light generated by the image unit 1.
  • a lens unit (not shown) arranged between the image unit 1 and the polarizing component 2, and its function is to correct the image of the first linearly polarized light generated by the image unit 1. The difference is that the lens unit and the image unit 1 are coaxially arranged, and the corrected first linearly polarized light enters the polarization component 2.
  • the first linearly polarized light L1 generated by the image unit 1 is refracted by the lens unit and then enters the polarization component 2.
  • the first linearly polarized light L1 is incident on the transflective component 203, part of the light is reflected to the polarizer 3. Since the polarizer 3 has the function of reflecting the first linearly polarized light and transmitting the second linearly polarized light, the first linearly polarized light is incident on the polarized light. In the case of component 3, it will only be reflected by the polarizing component 3 back to the transflective component 203, and will not be transmitted by the polarizing component 3.
  • the image light will not leak to the external environment, which solves the light leakage problem and effectively protects the user Privacy. Furthermore, part of the first linearly polarized light returned to the transflective part 203 will be transmitted from the transflective part 203. At this time, the polarization state of the light will not change and continue to propagate to the retarding part 202.
  • the retarder 202 since the retarder 202 has the function of converting linearly polarized light into circularly polarized light or elliptically polarized light, the first linearly polarized light will become elliptical or circularly polarized light and enter the absorbing polarizer. 201, and enter the human eye after being transmitted through the absorbing polarizer 201, so that the human eye can see the first linearly polarized light L1.
  • the external effective light L2 from the external environment is natural light, including the first linearly polarized light and the second linearly polarized light.
  • the polarizer 3 has the functions of reflecting the first linearly polarized light and transmitting the second linearly polarized light, after the external effective light L2 passes through the polarizing component 3, only the second linearly polarized light is transmitted and enters the polarizing component 2.
  • the incoming second linearly polarized light first passes through the transflective part 203 with a certain transmittance, and part of the light passes through the retarder 202 to become elliptical or circularly polarized light and then enters the absorbing polarizer 201.
  • the elliptical or circularly polarized light includes the first
  • the linearly polarized light enters the human eye after being transmitted through the absorbing polarizer 201. At this time, the user can see the external real environment while also seeing the image light superimposed in the real environment, thereby achieving an augmented reality effect.
  • the absorption polarizer 201 Since the absorption polarizer 201 has the function of transmitting the first linearly polarized light and reflecting the second linearly polarized light, when natural light passes through the absorption polarizer 201, only the first linearly polarized light can pass through and the second linearly polarized light After being absorbed, the first linearly polarized light will become circularly polarized or elliptically polarized light after passing through the retarder 202, and will pass through the transflective component 203 with a certain transmittance. Part of the light will pass through the retarder 202 again after being reflected.
  • the circularly polarized light or the elliptically polarized light becomes the second linearly polarized light, and the second linearly polarized light is absorbed when passing through the absorbing polarizer 201, thereby eliminating the external stray light, thereby achieving the improvement of the light required by the user (image light and external light). Effective light) and the external stray light contrast, thereby enhancing the user’s viewing experience when using the AR optical display module.
  • the AR optical display module further includes:
  • the image unit 1 is used to generate the second linearly polarized light.
  • the image unit 1 is arranged above the polarization component 2 and the image unit 1 and the polarization component 2 form an acute angle. In this way, the second linearly polarized light L1 generated by the image unit 1 can reach the polarization component 2.
  • the wave plate unit 4 is used to convert the second linearly polarized light generated by the image unit 1 into the first linearly polarized light, and the image unit 1 and the wave plate unit 4 are coaxially arranged.
  • the wave plate unit may optionally be a 1/2 wavelength wave plate or two 1/4 wavelength wave plates.
  • the embodiment of the present application may further include: a lens unit 5 arranged between the image unit 1 and the polarization component 2, the lens unit 5 is arranged above the polarization component 2 and is arranged coaxially with the image unit 1.
  • the lens unit 5 is used to correct the aberration of the second linearly polarized light generated by the image unit 1.
  • the lens unit 5 is arranged between the wave plate unit 4 and the polarization component 2, the lens unit 5 is used to correct the aberration of the first linearly polarized light converted by the wave plate unit 4.
  • the absorbing polarizer 201 passes the first linearly polarized light and absorbs the second linearly polarized light as an example, the working process of the AR optical display module of the embodiment of the present application will be described in detail.
  • the second linearly polarized light L1 generated by the image unit 1 is converted by the wave plate unit 4 to obtain the first linearly polarized light.
  • the first linearly polarized light is refracted by the lens unit 5 and then enters the polarization component 2.
  • the polarizer 3 Since the polarizer 3 has the function of reflecting the first linearly polarized light and transmitting the second linearly polarized light, the first linearly polarized light is incident on the polarized light. In the case of component 3, it will only be reflected by the polarizing component 3 back to the transflective component 203, and will not be transmitted by the polarizing component 3.
  • the image light will not leak to the external environment, which solves the light leakage problem and effectively protects the user Privacy. Furthermore, part of the first linearly polarized light returned to the transflective part 203 will be transmitted from the transflective part 203. At this time, the polarization state of the light will not change and continue to propagate to the retarding part 202.
  • the retarder 202 since the retarder 202 has the function of converting linearly polarized light into circularly polarized light or elliptically polarized light, the first linearly polarized light will become elliptical or circularly polarized light and enter the absorbing polarizer. 201, and enter the human eye after being transmitted through the absorbing polarizer 201, so that the human eye can see the first linearly polarized light L1.
  • the external effective light L2 from the external environment is natural light, including the first linearly polarized light and the second linearly polarized light.
  • the polarizer 3 has the functions of reflecting the first linearly polarized light and transmitting the second linearly polarized light, after the external effective light L2 passes through the polarizing component 3, only the second linearly polarized light is transmitted and enters the polarizing component 2.
  • the incoming second linearly polarized light first passes through the transflective part 203 with a certain transmittance, and part of the light passes through the retarder 202 to become elliptical or circularly polarized light and then enters the absorbing polarizer 201.
  • the elliptical or circularly polarized light includes the first
  • the linearly polarized light enters the human eye after being transmitted through the absorbing polarizer 201. At this time, the user can see the external real environment while also seeing the image light superimposed in the real environment, thereby achieving an augmented reality effect.
  • the absorption polarizer 201 Since the absorption polarizer 201 has the function of transmitting the first linearly polarized light and reflecting the second linearly polarized light, when natural light passes through the absorption polarizer 201, only the first linearly polarized light can pass through and the second linearly polarized light After being absorbed, the first linearly polarized light will become circularly polarized or elliptically polarized light after passing through the retarder 202, and will pass through the transflective component 203 with a certain transmittance. Part of the light will pass through the retarder 202 again after being reflected.
  • the circularly polarized light or the elliptically polarized light becomes the second linearly polarized light, and the second linearly polarized light is absorbed when passing through the absorbing polarizer 201, thereby eliminating the external stray light, thereby achieving the improvement of the light required by the user (image light and external light). Effective light) and the external stray light contrast, thereby enhancing the user’s viewing experience when using the AR optical display module.
  • the AR optical display module further includes:
  • Image unit 1 and polarizing unit 6 The image unit 1 is used to generate circularly polarized light or elliptically polarized light.
  • the image unit 1 is arranged above the polarization component 2, and the image unit 1 and the polarization component 2 form an acute angle. In this way, the circularly polarized light or elliptically polarized light L1 generated by the image unit 1 can reach the polarizing component 2.
  • the polarizing unit 6 is used to convert the circularly polarized light or elliptically polarized light generated by the image unit 1 into the first linearly polarized light, and the image unit 1 and the polarizing unit 6 are arranged coaxially. Wherein, the polarizing unit may transmit the first linearly polarized light and reflect the second linearly polarized light, or may transmit the second linearly polarized light and absorb the first linearly polarized light.
  • the embodiment of the present application may further include: a lens unit 5 arranged between the image unit 1 and the polarization component 2, the lens unit 5 is arranged above the polarization component 2 and is arranged coaxially with the image unit 1.
  • the lens unit 5 is used to correct the aberration of the circularly polarized light or the elliptically polarized light generated by the image unit 1.
  • the lens unit 5 is disposed between the polarizing unit 6 and the polarizing component 2
  • the lens unit 5 is used to correct the aberration of the first linearly polarized light converted by the wave plate unit 4.
  • the lens unit 5 is used to correct the aberration of the first linearly polarized light converted by the polarizing unit 6.
  • the absorbing polarizer 201 passes the first linearly polarized light and absorbs the second linearly polarized light as an example, the working process of the AR optical display module of the embodiment of the present application will be described in detail.
  • the circularly polarized light or elliptically polarized light L1 generated by the image unit 1 is converted by the polarizing unit 6 to obtain the first linearly polarized light.
  • the first linearly polarized light is refracted by the lens unit 5 and then enters the polarizing component 2. After the first linearly polarized light L1 is incident on the transflective component 203, part of the light is reflected to the polarizer 3. Since the polarizer 3 has the function of reflecting the first linearly polarized light and transmitting the second linearly polarized light, the first linearly polarized light is incident on the polarized light.
  • component 3 In the case of component 3, it will only be reflected by the polarizing component 3 back to the transflective component 203, and will not be transmitted by the polarizing component 3. Therefore, the image light will not leak to the external environment, which solves the light leakage problem and effectively protects the user Privacy. Furthermore, part of the first linearly polarized light returned to the transflective part 203 will be transmitted from the transflective part 203. At this time, the polarization state of the light will not change and continue to propagate to the retarding part 202.
  • the retarder 202 When passing through the retarder 202, since the retarder 202 has the function of converting linearly polarized light into circularly polarized light or elliptically polarized light, the first linearly polarized light will become elliptical or circularly polarized light and enter the absorbing polarizer. 201, and enter the human eye after being transmitted through the absorbing polarizer 201, so that the human eye can see the first linearly polarized light L1.
  • the external effective light L2 from the external environment is natural light or circularly polarized light or elliptically polarized light, including first linearly polarized light and second linearly polarized light.
  • the polarizing member 3 has the function of reflecting the first linearly polarized light and transmitting the second linearly polarized light, after the external effective light L2 passes through the polarizing component 3, only the second linearly polarized light is transmitted. And enter the polarization component 2.
  • the incoming second linearly polarized light first passes through the transflective part 203 with a certain transmittance, and part of the light passes through the retarder 202 to become elliptical or circularly polarized light and then enters the absorbing polarizer 201.
  • the elliptical or circularly polarized light includes the first The linearly polarized light enters the human eye after being transmitted through the absorbing polarizer 201.
  • the user can see the external real environment while also seeing the image light superimposed in the real environment, thereby achieving an augmented reality effect.
  • the absorption polarizer 201 Since the absorption polarizer 201 has the function of transmitting the first linearly polarized light and reflecting the second linearly polarized light, when natural light passes through the absorption polarizer 201, only the first linearly polarized light can pass through and the second linearly polarized light After being absorbed, the first linearly polarized light will become circularly polarized or elliptically polarized light after passing through the retarder 202, and will pass through the transflective component 203 with a certain transmittance. Part of the light will pass through the retarder 202 again after being reflected.
  • the circularly polarized light or the elliptically polarized light becomes the second linearly polarized light, and the second linearly polarized light is absorbed when passing through the absorbing polarizer 201, thereby eliminating the external stray light, thereby achieving the improvement of the light required by the user (image light and external light). Effective light) and the external stray light contrast, thereby enhancing the user’s viewing experience when using the AR optical display module.
  • the AR optical display module and augmented reality display device provided by the present application, through the cooperation of the polarizing component and the polarizing member, utilize the ingenious optical path design of the absorbing polarizer, the retardation member and the mirror to achieve It eliminates the external stray light and prevents the user from viewing the image light from leaking, and improves the contrast between the light (image light and external effective light) required by the user and the external stray light, thereby enhancing the user's viewing when using the AR optical display module The purpose of the experience.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

L'invention concerne un module d'affichage optique RA et un dispositif de réalité augmentée, comprenant : un ensemble de polarisation (2) et un premier composant transflectif (3) disposés séquentiellement le long d'un chemin optique. L'ensemble de polarisation (2) est conçu pour réfléchir une lumière incidente d'image (L1) vers le premier composant transflectif (3). Le premier composant transflectif (3) est conçu pour réfléchir la lumière d'image (L1) et transmettre une lumière efficace externe (L2). La lumière d'image (L1) réfléchie par le premier composant transflectif (3) et la lumière efficace externe (L1) transmise par le premier composant transflectif (3) atteignent l'ensemble de polarisation (2) et sont transmises au moyen de l'ensemble de polarisation (2) pour pénétrer dans un oeil humain. L'ensemble de polarisation (2) est en outre conçu pour absorber une lumière parasite externe incidente (L3). L'ensemble de polarisation (2) élimine la lumière parasite externe et améliore le contraste entre la lumière requise par un utilisateur et la lumière parasite externe (L3), ce qui permet d'améliorer l'expérience de visualisation de l'utilisateur à l'aide du module d'affichage optique RA.
PCT/CN2020/134996 2019-12-11 2020-12-09 Module d'affichage optique ra et dispositif de réalité augmentée WO2021115344A1 (fr)

Applications Claiming Priority (4)

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CN201911269734.9A CN111025638A (zh) 2019-12-11 2019-12-11 一种ar光学显示模组及增强现实设备
CN201911269734.9 2019-12-11
CN201911268580.1 2019-12-11
CN201911268580.1A CN110927970B (zh) 2019-12-11 2019-12-11 一种ar光学显示模组及增强现实显示设备

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