WO2023020399A1 - Système d'imagerie optique et procédé de commande - Google Patents

Système d'imagerie optique et procédé de commande Download PDF

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Publication number
WO2023020399A1
WO2023020399A1 PCT/CN2022/112224 CN2022112224W WO2023020399A1 WO 2023020399 A1 WO2023020399 A1 WO 2023020399A1 CN 2022112224 W CN2022112224 W CN 2022112224W WO 2023020399 A1 WO2023020399 A1 WO 2023020399A1
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WIPO (PCT)
Prior art keywords
polarized light
stray
component
optical
polarization direction
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PCT/CN2022/112224
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English (en)
Chinese (zh)
Inventor
邱孟
高少锐
吴巨帅
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华为技术有限公司
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Publication of WO2023020399A1 publication Critical patent/WO2023020399A1/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
    • 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

Definitions

  • the embodiments of the present application relate to the field of optical technologies, and in particular, to an optical imaging system and a control method.
  • Near-to-eye display (NED) system may include augmented reality (augmented reality, AR)/virtual reality technology (Virtual Reality, VR) display system, using a new display technology that directly displays AR/VR content to both eyes .
  • augmented reality augmented reality
  • VR Virtual Reality
  • VAC vergence-accommodation conflict
  • FoV large field of view
  • the image display accuracy of the NED system is limited.
  • a multi-state display system is currently provided, which can switch between different display states according to display requirements. For example, distant or near objects can be displayed by switching optical power.
  • an afterimage of another state will be mixed in, which is a kind of stray light.
  • Embodiments of the present application provide an optical imaging system and a control method for removing stray light generated by a multi-state display system.
  • the embodiment of the present application provides an optical imaging system, including an optical component and a control component, the optical component includes a state adjustment component and a stray polarized light elimination component; the state adjustment component is used to control the input The polarized light adjusts the beam state to output the target polarized light and stray polarized light, and the stray polarized light is orthogonal to the polarization direction of the target polarized light; the stray polarized light elimination component is used to receive the target polarized light and stray polarized light, And under the control of the control component, the polarization direction of the stray polarized light is adjusted, so that the stray polarized light can be eliminated and the target polarized light can be output.
  • the stray polarized light elimination component adjusts the polarization direction of the input stray polarized light through the control component, so that the target polarized light is output and the stray polarized light is eliminated. Scattered polarized light filtering.
  • the stray polarized light elimination component includes a first polarization converter and a first polarizer, and the first polarizer only transmits polarized light in the first polarization direction; the control component is specifically used for: adjusting When the target polarized light output by the component adjustment has a first polarization direction and the stray polarized light has a second polarization direction, the first polarization converter is controlled to maintain the polarization direction of the polarized light output by the state adjustment component; or, when the state adjustment component adjusts the output When the target polarized light has a second polarization direction and the stray polarized light has a first polarization direction, the polarization direction of the target polarized light output by the first polarization converter is controlled to be the first polarization direction, and the conversion state adjustment component is The polarization direction of the output stray polarized light is the second polarization direction; wherein, the first polarization direction is orthogonal to the second polarization direction.
  • the control component controls the first polarization converter in the stray polarized light elimination component, so that the polarization direction of the target polarized light is the same as the transmission direction of the first polarizer, so that the polarization direction of the stray polarized light is the same as that of the first polarized light
  • the transmission directions of the polarizers are orthogonal, so that the first polarizer can filter out stray polarized light and output the target polarized light.
  • the first polarization converter is a nematic liquid crystal cell, an orthogonally aligned VA liquid crystal cell, a plate switching IPS liquid crystal cell, an electrically controlled twisted nematic TN liquid crystal cell, an electrically controlled nonlinear crystal, or an electrically controlled Control any of the ferroelectric liquid crystal cells.
  • control component is specifically used to: control the first polarization converter to be in an unpowered state, so that the first polarization converter maintains the state to adjust the polarization direction of the polarized light output by the component; or, control the first The polarization converter is in a power-on state, so that the polarization direction of the target polarized light output by the first polarization converter conversion state adjustment component is the first polarization direction, and the polarization direction of the stray polarized light output by the conversion state adjustment component is the second polarization direction direction.
  • control component is specifically used to: control the first polarization converter to be in a power-on state, so that the first polarization converter maintains the state to adjust the polarization direction of the polarized light output by the component; or, control the first polarization The converter is in an unpowered state, so that the polarization direction of the target polarized light output by the first polarization converter conversion state adjustment component is the first polarization direction, and the polarization direction of the stray polarized light output by the conversion state adjustment component is the second polarization direction direction.
  • control component controls the power-on or non-power-on state of the first polarization converter, so that the first polarization converter adjusts the polarization direction of the input polarized light, and then realizes that the first polarizer converts the stray polarization Optical filtering outputs target polarized light.
  • the state adjustment component includes a second polarization converter and a transmitted light component; wherein, the control component is specifically used to control the second polarization converter to adjust the polarization direction of the input polarized light so that the transmitted light
  • the target polarized light output by the component has a third polarization direction or a fourth polarization direction; wherein, the third polarization direction is orthogonal to the fourth polarization direction.
  • the control component can control the polarization direction of the second polarization converter, and then determine the polarization direction of the target polarized light output by the transmitted light component. It is also possible to determine the polarization direction of the stray polarized light, so that the control can further control the stray polarized light eliminating component to filter the stray polarized light and output the target polarized light.
  • the transmitted light component is specifically configured to diverge or converge the input polarized light under the control of the control component.
  • the control component can control the polarization direction of the polarized light input by the transmitted light component to realize the divergence or convergence processing of the input polarized light by the transmitted light component, so as to realize the adjustment of the beam state of the input polarized light.
  • the transmitted light component can support switching between divergence and parallel, or support switching between divergence and convergence, or support switching between convergence and parallel.
  • the transmitted light component sequentially includes a first 1/4 wave plate, a polarizing lens and a second 1/4 wave plate in the direction of light propagation
  • the polarizing lens is a liquid crystal lens, a liquid crystal geometric phase lens, a metasurface Either polarizing lens or metasurface geometric phase lens.
  • the optical axis of the fast axis of the first 1/4 wave plate coincides with the optical axis of the fast axis of the second 1/4 wave plate; the control component is specifically used to control the second polarization converter and the first The enable state of the polarization converter is reversed.
  • the first polarization converter is enabled, the second polarization converter is disabled, or the first polarization converter is disabled and the second polarization converter is enabled.
  • enabled can be understood as powered on, and disabled can be understood as not powered on.
  • the optical axis of the fast axis of the first 1/4 wave plate is orthogonal to the optical axis of the fast axis of the second 1/4 wave plate; the control component is specifically used to control the connection between the second polarization converter and the first The enable state of a polarization converter is the same.
  • control component only needs to control the enabling state of the second polarization converter to be opposite to that of the first polarization converter, so that the optical component can eliminate stray polarized light and output target polarized light.
  • control component controls the enabled state of the second polarization converter to make the transmitted light component adjust the beam state, and output the required target polarized light, because the transmitted light component generates stray polarization when adjusting the beam state The light, and then the control component controls the enabled state of the first polarization converter, so that the stray polarized light is filtered by the first polarizer.
  • the optical imaging system includes N optical components, where N is a positive integer; the optical imaging system supports imaging on any one of at most 2 N focal planes; the control component is specifically used to control The state adjustment components respectively included in the N optical components output the beam state of the target polarized light, so that the optical focal plane for imaging by the optical imaging system is switched among at most 2 N optical focal planes.
  • N optical focal planes can be switched by connecting N optical components in series. For example, when the optical powers supported by the N optical components are all different, switching of 2 N optical focal planes can be realized.
  • the optical imaging system includes at least two optical components, and the distance between the two optical components is set; the optical imaging system supports a first viewing angle and a second viewing angle; the optical imaging system also includes A converging lens; a control component, which is specifically used to control the state adjustment component included in the first optical component of the two optical components to have a negative optical power (or control the state adjustment component to perform divergence processing on the input polarized light), and control
  • the state adjusting component included in the second optical component of the two optical components has a positive optical power (or in other words, the state adjusting component is controlled to converge the input polarized light), so that the polarized light carrying image information input to the optical imaging system passes through
  • the angle of view of the imaging after the converging lens is the first angle of view; the first optical assembly and the second optical assembly are placed sequentially in the direction of propagation of the optical path; or, it is specifically used to control the first optical assembly included in the two optical assemblies
  • the state adjusting component has a positive optical power, and the state
  • the control component controls the first optical component to diverge the input polarized light, after transmission at a set distance, continue to increase the beam width, and then control the second optical component to converge, so that the output of parallel light, and then Through the focusing lens, the target polarized light with a large field of view is output.
  • the control component controls the first optical component to converge the input polarized light, and after transmission at a set distance, continues to narrow the beam width, and then controls the second optical component to perform divergence processing, so that parallel light is output, and then focused
  • the lens makes it possible to output target polarized light with a small field of view.
  • each optical component is capable of eliminating stray polarized light, and in the case of field-of-view switching, stray polarized light is eliminated.
  • the optical imaging system includes at least two optical components, the optical imaging system further includes a second polarizer, the second polarizer is coupled to the first optical component of the two optical components, and the first optical component is coupled to the first optical component of the two optical components.
  • the second optical component of the two optical components is coupled through an optical waveguide; the first optical component, the optical waveguide, and the second optical component are placed in sequence in the propagation direction of the optical path;
  • the working states supported by the optical imaging system include supporting AR state and VR state;
  • the optical imaging system also includes: a projection component, which is used to input the polarized light of the image to the second optical component through the optical waveguide; a second polarizer, which is used to convert the input natural light into polarized light, and input it to the first optical component;
  • the component is specifically used to: make the optical imaging system in the AR state by controlling the first optical component to be in the working state and controlling the second optical component to be in the working state; or, by controlling the first optical component to be in a non-working state and controlling the second optical
  • the component is in the working state, so that the optical imaging system is in the VR state; wherein, when the first optical component is in the non-working state, the stray polarized light elimination component of the first optical component is used
  • the first optical component is controlled to eliminate the input natural polarized light, that is, to prevent the natural polarized light from entering the second optical component, so that the optical imaging system is in the VR state.
  • the first optical component is controlled to output natural polarized light, that is, the natural polarized light is incident on the second optical component and merged with the image polarized light, so that the optical imaging system is in an AR state.
  • the embodiment of the present application provides a control method, the method is applied to a wearable device, the wearable device includes an optical component, the optical component includes a state adjustment component and a stray polarized light elimination component; receiving polarized light carrying image information, And input the state adjustment component; when the near focal plane state of the wearable device is turned on, control the state adjustment component to diverge the input polarized light, so that the state adjustment component outputs the first target polarized light and the first stray polarized light; the second A stray polarized light is orthogonal to the polarization direction of the first target polarized light; the stray polarized light eliminating component is controlled to adjust the polarization direction of the first stray polarized light, so that the stray polarized light eliminating component eliminates the first stray polarized light , and output the first target polarized light; when the far focal plane state of the wearable device is turned on, control the state adjustment component to converge the input polarized light,
  • the stray polarized light elimination component includes a second polarization converter and a first polarizer, and the first polarizer only transmits polarized light in the first polarization direction; the first stray polarized light has a second polarization direction and the first target polarized light has a first polarization direction, the second stray polarized light has a first polarization direction and the second target polarized light has a first polarization direction; the stray polarized light elimination component is controlled to adjust the first stray polarized light
  • the polarization direction including: controlling the polarization direction of the polarized light output by the second polarization converter to maintain the state adjustment component, so that the first polarizer eliminates the first stray polarized light; controlling the stray polarized light elimination component to adjust the second stray polarization
  • the polarization direction of the light includes: controlling the polarization direction of the second target polarized light output by the second polarization converter conversion state adjustment component
  • the stray polarized light elimination component includes a second polarization converter and a first polarizer, the first polarizer only transmits polarized light in the second polarization direction; the first stray polarized light has the second polarized light direction and the first target polarized light has a first polarization direction, the second stray polarized light has a first polarization direction and the second target polarized light has a first polarization direction; the stray polarized light elimination component is controlled to adjust the first stray polarized light
  • the polarization direction of the second polarization converter including: controlling the polarization direction of the first target polarized light output by the second polarization converter to switch the state adjustment component to the second polarization direction, and the polarization direction of the first stray polarized light output by the conversion state adjustment component to be the second polarization direction A polarization direction such that the first polarizer eliminates the first stray polarized light.
  • Controlling the stray polarized light elimination component to adjust the polarization direction of the second stray polarized light includes: controlling the polarization direction of the polarized light output by the second polarization converter to maintain the state adjustment component, so that the first polarizer eliminates the second stray polarized light .
  • controlling the polarization direction of the polarized light output by the second polarization converter to maintain the state adjustment component includes: controlling the second polarization converter to be in the power-on state, so that the second polarization converter maintains the state to adjust the polarization direction of the output of the component The polarization direction of the polarized light; controlling the polarization direction of the second target polarized light output by the second polarization converter to switch the state adjustment component to be the first polarization direction, and the polarization direction of the second stray polarized light output by the conversion state adjustment component to be the first polarization direction
  • Two polarization directions including: controlling the second polarization converter to be in an unpowered state, so that the polarization direction of the second target polarized light output by the second polarization converter conversion state adjustment component is the first polarization direction, and the output of the conversion state adjustment component The polarization direction of the second stray polarized light is the second polarization direction.
  • the embodiment of the present application provides a control method, the method is applied to a wearable device, and the wearable device sequentially includes a first optical component, an optical waveguide, and a second optical component in the propagation direction of the optical path; the first optical component includes the first A state adjustment component and a first stray polarization elimination component, the second optical component includes a second state adjustment component and a second stray polarization elimination component; receive the first polarized light converted from natural light, and input it into the first optical component, and receive the second polarized light carrying the image information, and input the second optical component through the optical waveguide; when the virtual reality VR state of the wearable device is turned on, control the first state adjustment component to output the second polarized light when the first polarized light is input A target polarized light; controlling the first stray polarized light eliminating component to adjust the polarization direction of the first target polarized light, so that the first stray polarized light eliminating component eliminates the first target polarized light to prevent the
  • an embodiment of the present application provides a control method, which is applied to a wearable device, and the wearable device sequentially includes a first optical component, an optical waveguide, and a second optical component in the propagation direction of the optical path;
  • the first optical component includes a first optical component A state adjustment component and a first stray polarization elimination component
  • the second optical component includes a second state adjustment component and a second stray polarization elimination component;
  • the augmented reality AR state of the wearable device is turned on, control the first state adjustment component to output the third target polarization when the first polarized light is input light and the second stray polarized light;
  • the second stray polarized light is perpendicular to the polarization direction of the third target polarized light;
  • the first stray polarized light elimination component is controlled to adjust
  • an embodiment of the present application provides a control method, the method is applied to a wearable device, the wearable device includes a first optical component and a second optical component, the first optical component is coupled to the second optical component, and the first optical component A set distance is spaced from the second optical assembly, the first optical assembly includes a first state adjustment assembly and a first stray polarization elimination assembly, and the second optical assembly includes a second state adjustment assembly and a second stray polarization elimination assembly; Receive polarized light carrying image information and input it into the first optical component; when the first field of view state of the wearable device is turned on, control the first state adjustment component to diverge the polarized light, so that the first state adjustment component outputs the first A target polarized light and a first stray polarized light, the first stray polarized light is orthogonal to the polarization direction of the first target polarized light; controlling the first stray polarized light elimination component to adjust the polarization direction of the first stray
  • an embodiment of the present application provides a control method, the method is applied to a wearable device, the wearable device includes a first optical component and a second optical component, the first optical component is coupled to the second optical component, and the first optical component A set distance is spaced from the second optical assembly, the first optical assembly includes a first state adjustment assembly and a first stray polarization elimination assembly, and the second optical assembly includes a second state adjustment assembly and a second stray polarization elimination assembly; Receive polarized light carrying image information and input it into the first optical component; when the second field of view state of the wearable device is turned on, control the first state adjustment component to converge the polarized light so that the first state adjustment component outputs the second Three target polarized light and the third stray polarized light, the third stray polarized light is orthogonal to the polarization direction of the third target polarized light; the first stray polarized light elimination component is controlled to adjust the polarization direction of the third stray polar
  • the present application provides a control device, which is used to implement any one of the methods in the second aspect to the sixth aspect above, and includes corresponding functional modules, respectively used to implement the steps in the above methods.
  • the functions may be implemented by hardware, or may be implemented by executing corresponding software through hardware.
  • Hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the present application provides a computer-readable storage medium, in which a computer program or instruction is stored, and when the computer program or instruction is executed by a head-mounted display device, the head-mounted display device executes A method in any possible implementation manner of the second aspect to the sixth aspect above.
  • the present application provides a computer program product, the computer program product includes a computer program or an instruction, and when the computer program or instruction is executed by a terminal device, any possible implementation of the above-mentioned second aspect to the sixth aspect can be realized method in .
  • FIG. 1 is a schematic structural diagram of an optical imaging system provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a stray polarized light elimination component provided by an embodiment of the present application
  • FIG. 3 is a schematic structural diagram of a state adjustment component provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of another optical imaging system provided by the embodiment of the present application.
  • FIG. 5A is a schematic structural diagram of another state adjustment component provided by the embodiment of the present application.
  • FIG. 5B is a schematic diagram of the beam transmission state in the optical component provided by the embodiment of the present application.
  • FIG. 6A is a schematic structural diagram of an optical component provided by an embodiment of the present application.
  • FIG. 6B is a schematic diagram of the beam transmission state in the optical component provided by the embodiment of the present application.
  • FIG. 6C is a schematic diagram of the position of the optical assembly provided in the embodiment of the present application in the lens barrel;
  • FIG. 7A is a schematic diagram of the beam transmission state in the near-focus plane state provided by the embodiment of the present application.
  • FIG. 7B is a schematic diagram of the beam transmission state in the near-focus plane state provided by the embodiment of the present application.
  • FIG. 7C is a schematic diagram of the beam transmission state in the state of the far focal plane provided by the embodiment of the present application.
  • Fig. 7D is a schematic diagram of the beam transmission state in the state of the far focal plane provided by the embodiment of the present application.
  • FIG. 8A is a schematic diagram of the beam transmission state in the near-focus plane state provided by the embodiment of the present application.
  • FIG. 8B is a schematic diagram of the beam transmission state in the far focal plane state provided by the embodiment of the present application.
  • Fig. 9 is a schematic diagram of beam transmission states under different optical focal planes provided by the embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of another optical imaging system provided by the embodiment of the present application.
  • Fig. 11A is a schematic structural diagram of another optical imaging system provided by the embodiment of the present application.
  • FIG. 11B is a schematic structural diagram of another optical imaging system provided by the embodiment of the present application.
  • FIG. 11C is a schematic diagram of the beam transmission state at the near-focus plane in the AR state provided by the embodiment of the present application.
  • FIG. 11D is a schematic diagram of the beam transmission state at the far focal plane in the AR state provided by the embodiment of the present application.
  • FIG. 12A is a schematic diagram of the beam transmission state at the far focal plane in the VR state provided by the embodiment of the present application.
  • FIG. 12B is a schematic diagram of the beam transmission state when near the focal plane in the VR state provided by the embodiment of the present application.
  • FIG. 13A is a schematic diagram of the beam transmission state at a small field of view provided by the embodiment of the present application.
  • FIG. 13B is a schematic diagram of the beam transmission state at a large field of view provided by the embodiment of the present application.
  • FIG. 14 is a schematic flow chart of a control method provided by the embodiment of the present application.
  • Fig. 15 is a schematic flowchart of another control method provided by the embodiment of the present application.
  • Fig. 16 is a schematic flow chart of another control method provided by the embodiment of the present application.
  • Fig. 17 is a schematic flow chart of another control method provided by the embodiment of the present application.
  • Fig. 18 is a schematic flow chart of another control method provided by the embodiment of the present application.
  • FIG. 19 is a schematic flowchart of another control method provided by the embodiment of the present application.
  • Displaying near the eyes is a display method of AR display devices or VR display devices.
  • the focal power is equal to the difference between the convergence degree of the image beam and the object beam convergence, which characterizes the ability of the optical system to deflect light.
  • Common letters of optical power Indicates that the refractive spherical power Among them, n' is the refractive index of the image space, n is the refractive index of the object space, r is the spherical radius, p is the image distance, and q is the object distance.
  • the focal power is expressed as the reciprocal of the focal length of the image side (approximately, the refractive index of air is considered to be 1).
  • the 1/4 wave plate is a birefringent optical device, including two fast axis optical axes, the fast axis and the slow axis, which can be used to make the linearly polarized light along the fast axis and the slow axis pass through the 1/4 wave plate to generate ⁇ /2 phase difference.
  • a polarizing lens is a transparent material, usually glass or plastic, whose power to the optical system is related to the polarization state of the input light. For example, if a left-handed circularly polarized beam is input, it exhibits positive optical power, and when an opposite right-handed circularly polarized light is input, it exhibits negative or zero optical power.
  • Common polarizing lenses include geometric phase lenses, liquid crystal lenses, and geometric phase metalens.
  • a polarization converter is a device for converting the polarization state of polarized light.
  • any unwanted light that reaches the detector surface or the human eye after propagation is stray polarized light; for the non-imaging optical system, any imaging or other non-imaging
  • the light spots formed by the expected light propagation are stray polarized light.
  • stray polarized light may include ghost polarized light.
  • the embodiments of the present application are applied to wearable devices.
  • the wearable device may be a near eye display (near eye display, NED) device, such as VR glasses, or a VR helmet.
  • NED near eye display
  • VR glasses such as VR glasses
  • VR helmet a VR helmet
  • users wear NED devices to play games, read, watch movies (or TV series), participate in virtual conferences, participate in video education, or video shopping.
  • the near-eye display device involved in the embodiments of the present application can realize multi-state switching, for example, switching between different imaging focal planes. Another example is switching between different FOVs. Another example is switching between the AR state and the VR state.
  • an embodiment of the present application provides an optical imaging system, which ensures that the target polarized light and stray polarized light have different polarization directions in different states, thereby filtering out stray polarized light according to the polarization direction of the stray polarized light polarized light.
  • the optical imaging system includes one or more optical components 100 .
  • the number of optical components 100 included in the optical imaging system is related to the required state switching.
  • the optical imaging system further includes a control component 200 .
  • the optical component 100 includes a state adjusting component 110 and a stray polarized light eliminating component 120 .
  • the state adjusting component 110 adjusts the beam state of the input polarized light to obtain the target polarized light.
  • the adjustment of the beam state may be, for example, divergence processing, and may be, for example, convergence processing.
  • the state adjustment component 110 performs beam state on the input polarized light and then outputs the target polarized light
  • stray polarized light will also be generated.
  • the polarization directions of the output target polarized light and the output stray polarized light of the state adjusting component 110 are orthogonal.
  • the stray polarized light elimination component 120 adjusts the polarization direction of the stray polarized light under the control of the control component 200 to eliminate the stray polarized light and output the target polarized light.
  • the stray polarized light elimination component 120 has the function of adjusting the polarization direction of the polarized light and the function of transmitting the polarized light with a fixed polarization direction. Based on this, the stray polarized light elimination component 120 adjusts the polarization direction of the stray polarized light under the control of the control component 200, so that the polarization direction of the stray polarized light is orthogonal to the fixed polarization direction, that is Realize that the stray polarized light elimination component 120 can eliminate the stray polarized light and output the target polarized light.
  • the stray polarized light eliminating component 120 adjusts the polarization direction of the stray polarized light, it also adjusts the polarization direction of the target polarized light input into the stray polarized light eliminating component 120, and the stray polarized light is still maintained.
  • the polarization directions of scattered polarized light and target polarized light are always kept orthogonal.
  • the fixed polarization direction that the stray polarized light and the stray polarized light eliminating component 120 can transmit is orthogonal, and the target polarized light is perpendicular to the fixed polarization direction that the stray polarized light eliminating component 120 can transmit.
  • the transmitted fixed polarization directions are parallel, therefore, the stray polarized light is blocked and the target polarized light is output.
  • control component 200 can also control the optical component 100 to be in a non-working state.
  • the optical component 100 can eliminate the target polarized light under the control of the control component 200 .
  • FIG. 1 Each functional component and structure in FIG. 1 will be introduced and described below, so as to give an exemplary specific implementation solution.
  • the stray polarized light elimination component 120 may include a first polarization converter 1201 and a first polarizer 1202 .
  • the first polarization converter 1201 is configured to maintain the polarization directions of the target polarized light and stray polarized light output by the transmitted light component 102 , or convert the polarization directions of the target polarized light and stray polarized light output by the transmitted light component 102 .
  • the first polarization switch 1201 may be an electronically controlled polarization switch (ECPS).
  • the electronically controlled polarization converter may be a nematic liquid crystal cell (nematic liquid crystals), a vertical alignment (vertical alignment, VA) liquid crystal cell, a plate switching (in-plane switching, IPS) liquid crystal cell, an electronically controlled twist Any of nematic (twisted nematic, TN) liquid crystal cell, electrically controlled nonlinear crystal or electrically controlled ferroelectric liquid crystal cell.
  • the control component 200 controls the first polarization converter 1201 to maintain the polarization direction of the input polarized light when it is not powered on, which can be understood as the polarization of the input polarized light and the output polarized light
  • the directions are the same, or it can be understood that the first polarization converter 1201 only transmits the input polarized light.
  • the embodiment of this application will only transmit the input polarized light and the output polarized light. The light is considered to be the same polarized light.
  • control component 200 controls the first polarization converter 1201 to convert the polarization direction of the input polarized light when it is powered on, for example, convert the input polarized light from the X direction to Y direction, or convert the input polarized light from Y direction to X direction.
  • the twisted nematic liquid crystal cell consists of two conductive substrates sandwiching a liquid crystal layer.
  • the polarization direction of the incident polarized light passing through the twisted nematic liquid crystal cell is rotated by 90 degrees; when the twisted nematic liquid crystal is powered on, the twisted nematic liquid crystal stands upright, then The polarization direction of the incident polarized light passing through the twisted nematic liquid crystal remains unchanged, and the polarized light with the same polarization state as the incident polarized light is still emitted.
  • the first polarizer 1202 only transmits polarized light with a fixed polarization direction; the target polarized light input to the first polarizer 1202 is a fixed polarization direction, because the polarization direction of the target polarized light is orthogonal to the polarization direction of the stray polarized light, so The first polarizer can filter out stray polarized light and output target polarized light.
  • Polarizer refers to an optical element that can make natural light into polarized light.
  • Polarizers can be divided into natural polarizers and artificial polarizers. Natural polarizers are made of crystals.
  • the artificial polarizer is a composite material laminated with a polarizing film, an inner protective film, a pressure-sensitive adhesive layer and an outer protective film.
  • the polarizer can be divided into two types: black and white polarizer and color polarizer.
  • the polarizer can be divided into three types: transmission, transreflection and anti-transmission. For example, absorbing polarizer (absorptive polarizer). It has the function of shielding and passing through the incident light.
  • the vertical light can be transmitted and the horizontal light can be blocked; or the horizontal light can be transmitted and the vertical light can be blocked.
  • the first polarizer 1202 may be a linear polarizer.
  • a linear polarizer For example, a metal wire grid type, a multilayer birefringent polymer film type, or a MacNeille type, and the like.
  • the polarized light transmitted by the linear polarizer refers to the linearly polarized light.
  • the linearly polarized light can be P light or S light. Understandably, unpolarized light includes both P light and S light.
  • P light refers to the light whose polarization direction is parallel to a certain reference plane, which is related to the structure of the polarizer
  • S light refers to the light whose polarization direction is orthogonal to the reference plane.
  • a linear polarizer transmits P light and blocks S light.
  • Polarization of light The phenomenon that the spatial distribution of light wave electric vector vibration loses symmetry with respect to the propagation direction of light is called polarization of light. It is the most obvious sign that the shear wave is different from other longitudinal waves. Only transverse waves can produce polarization, so the polarization of light is another example of the wave nature of light. In the plane perpendicular to the direction of propagation, it contains transverse vibrations in all possible directions, and on average, has the same amplitude in any direction. The light whose transverse vibration is symmetrical to the direction of propagation is called natural light (non-polarized light). Light whose vibration loses this symmetry is collectively called polarized light. Polarized light may include linearly polarized light, partially polarized light, and circularly polarized light. Looking at the direction of the light, those whose electric vector rotates clockwise are called right-handed circularly polarized light, and those whose electric vector rotates counterclockwise are called left-handed circularly polarized light.
  • the fixed polarization direction is the Y direction as an example.
  • the control component 200 can adjust the polarization direction of the target polarized light and stray polarized light output by the first polarization converter 1201, so that the polarization direction of the target polarized light input to the first polarizer 1202 is the Y direction, and input to the first polarized light
  • the polarization direction of the stray polarized light of the plate 1202 is the X direction, and after passing through the first polarizing plate 1202, the stray polarized light in the X direction is eliminated, and the target polarized light in the Y direction is output.
  • a possible structure of the state adjustment component 110 is introduced and described as follows.
  • the state adjustment component 110 includes a second polarization converter 101 and a transmitted light component 102 .
  • the structure of the optical component 100 can be referred to as shown in FIG. 4 .
  • the second polarization converter 101 is used to maintain the polarization direction of the input polarized light or convert the polarization direction of the input polarized light.
  • the transmitted light component 102 is used for diverging or converging the input polarized light. It should be noted that the transmitted light component 102 has optical power, and supports positive optical power and negative optical power. Under the positive optical power, the input polarized light can be converged, and on the contrary, under the negative optical power, the input polarized light can be diverged.
  • the second polarization converter 101 maintains the polarization direction of the input polarized light when it is not powered on. When the second polarization converter is powered on, it converts the polarization direction of the input polarized light.
  • the polarization direction of the input polarized light is the X direction
  • the polarization direction of the output polarized light is the Y direction.
  • the transmitted light component 102 when the transmitted light component 102 inputs polarized light with different polarization directions, it can realize the adjustment of different beam states of the input polarized light.
  • the transmitted light component 102 when the first polarization direction is input, the transmitted light component 102 performs converging processing on the input polarized light, for example, when the second polarization direction is input, the transmitted light component 102 performs divergent processing on the input polarized light. Therefore, in some scenarios, when the optical component 100 is required to implement converging processing, the second polarization converter 101 may be controlled by the control component 200 so that the second polarization converter 101 outputs polarized light in the first polarization direction. In other scenarios, when optical components are required to implement divergence processing, the second polarization converter 101 may be controlled through the control component 200 so that the second polarization converter 101 outputs polarized light in the second polarization direction.
  • stray polarized light When the polarized light output by the second polarization converter 101 propagates in the transmitted light component 102 , stray polarized light will be generated.
  • the lens light component 102 adjusts the beam state of the polarized light output by the second polarization converter 101 to output the target polarized light, stray polarized light will be generated.
  • the second polarization switch 101 may be an electronically controlled polarization switch (ECPS).
  • the electronically controlled polarization converter may be a nematic liquid crystal cell (nematic liquid crystals), a vertical alignment (vertical alignment, VA) liquid crystal cell, a plate switching (in-plane switching, IPS) liquid crystal cell, an electronically controlled twist Any of nematic (twisted nematic, TN) liquid crystal cell, electrically controlled nonlinear crystal or electrically controlled ferroelectric liquid crystal cell.
  • the control component 200 controls the second polarization converter 101 to maintain the polarization direction of the input polarized light when it is not powered on, which can be understood as the polarization of the input polarized light and the output polarized light
  • the directions are the same, or it can be understood that the second polarization converter 101 only transmits the input polarized light.
  • the embodiment of this application will only transmit the input polarized light and the output polarized light. The light is considered to be the same polarized light.
  • control component 200 controls the second polarization converter 101 to convert the polarization direction of the input polarized light when it is powered on, such as converting the input polarized light from the X direction to Y direction, or convert the input polarized light from Y direction to X direction.
  • the control component 200 controls the second polarization converter 101 to be powered on or off, so that the polarized light output by the transmitted light component 102 has positive or negative refractive power, which can realize the switching of the focal plane of imaging or the realization of the field of view angle switching and so on.
  • the twisted nematic liquid crystal cell consists of two conductive substrates sandwiching a liquid crystal layer.
  • the polarization direction of the incident polarized light passing through the twisted nematic liquid crystal cell is rotated by 90 degrees; when the twisted nematic liquid crystal is powered on, the twisted nematic liquid crystal stands upright, then The polarization direction of the incident polarized light passing through the twisted nematic liquid crystal remains unchanged, and the polarized light with the same polarization state as the incident polarized light is still emitted.
  • the transmitted light component 102 involved in the embodiment of the present application has optical power.
  • the polarization direction of the input polarized light is different, and different positive and negative optical powers are realized.
  • the transmitted light component 102 is a linear polarization-dependent lens.
  • light convergence or divergence can be achieved by adjusting the polarization direction of the input polarized light of the linear polarization-dependent lens, so as to achieve different positive and negative optical powers, that is, displays with different viewing angles can be realized according to requirements.
  • the linear polarization-dependent lens may be a birefringent liquid crystal lens.
  • the transmitted light component 102 includes a first 1/4 wave plate 1021 , a polarizing lens 1022 and a second 1/4 wave plate 1023 .
  • 1/4 wave plate can also be called 45 degree phase retarder.
  • Quarter wave plates are made of birefringent materials.
  • the light passing through the 1/4 wave plate is circularly polarized light; otherwise, when the circularly polarized light passes through the 1/4 wave plate into linearly polarized light.
  • a 1/4 wave plate can convert linearly polarized light in the X direction into left-handed circularly polarized light, and convert linearly polarized light in the Y direction into right-handed circularly polarized light.
  • a quarter-wave plate converts left-handed circularly polarized light into X-direction linearly polarized light, and right-handed circularly polarized light into Y-direction linearly polarized light.
  • the 1/4 wave plate can convert the linearly polarized light in the X direction into right-handed circularly polarized light, and convert the linearly polarized light in the Y direction into left-handed circularly polarized light.
  • a quarter-wave plate converts left-handed circularly polarized light into Y-direction linearly polarized light, and right-handed circularly polarized light into X-direction linearly polarized light.
  • the direction in which a line turns a circle is the same.
  • the first 1/4 wave plate 1021 and the second 1/4 wave plate 1023 convert linearly polarized light in the X direction into right-handed circularly polarized light. If the first 1/4 wave plate 1021 and the second 1/4 wave plate 1023 are perpendicular to the fast axis, optical axis, and fast axis, the directions of the two lines turning circles are opposite.
  • the second 1/4 wave plate 1023 converts all linearly polarized light in the X direction to left-handed circularly polarized light.
  • the polarizing lens 1022 may also be called a polarization dependent lens (polarization dependent lens, PDL) 1022 .
  • the polarization-dependent lens may be a liquid crystal lens, a liquid crystal geometric phase lens, a metasurface polarizing lens, or a metasurface geometric phase lens, and the like.
  • PDLs use a polarization-dependent geometric phase distribution similar to spatial lenses to shape the wavefront of the outgoing beam, thereby modifying the direction of propagation of the incident beam.
  • PDLs are used to process circularly polarized incident beams.
  • whether a parallel incident beam converges or diverges depends on the handedness of the incident circularly polarized beam.
  • PDL has a converging effect on left-handed circularly polarized light and a diverging effect on right-handed circularly polarized light.
  • the PDL produces divergence for right-handed circularly polarized light and converges for left-handed circularly polarized light.
  • the polarization direction of the light beam output from the second polarization converter 101 is the X direction, which is called polarized light 1, and after passing through the first 1/4 wave plate 1021, it is converted into right-handed circularly polarized light 1 .
  • the right-handed circularly polarized light 1 enters the PDL 1022. Taking the converging effect of the PDL 1022 on the right-handed circularly polarized light as an example, the right-handed circularly polarized light 1 is processed by the PDL 1022 to output the left-handed circularly polarized light 2. Due to the limitation of the efficiency of PDL 1022, for example, in the range of RGB three colors and ⁇ 45° field of view, the maximum efficiency can only reach 90+%.
  • ECPS is generally implemented by liquid crystal cells. Taking TN liquid crystal cells as an example, when the power is turned on, the efficiency is poor in the directions of 45 degrees, 135 degrees, 225 degrees and 315 degrees. Therefore, after the polarized light 1 is processed by the second polarization converter 101 and the PDL, stray polarized light will be generated. In general, right-handed circularly polarized light 1 may produce stray polarized light when left-handed circularly polarized light 2 is obtained after being processed by PDL 1022.
  • the multi-state optical imaging system based on the PDL when switching to a certain state, will mix the afterimage of another state, and the afterimage of the other state is related to the state.
  • the polarization direction of the target light is orthogonal. If it is circularly polarized light, the direction of rotation of the stray polarized light is opposite to that of the target light (ie, right-handed circularly polarized light 2 ).
  • the fast axis direction of the second 1/4 wave plate 1023 is parallel to that of the first 1/4 wave plate 1021 .
  • the second 1/4 wave plate 1023 is used to convert circularly polarized light into linearly polarized light, so after the left-handed circularly polarized light 2 is processed by the second 1/4 wave plate 1023, the left-handed circularly polarized light 2 is converted into polarized light 2,
  • the polarization direction of polarized light 2 is the Y direction.
  • the polarized light 2 is perpendicular to the polarization direction of the linearly polarized stray polarized light, and the polarization direction of the linearly polarized stray polarized light is the X direction.
  • the second 1/4 wave plate 1023 is perpendicular to the fast axis optical axis direction of the first 1/4 wave plate 1021 .
  • the second 1/4 wave plate 1023 is used to convert circularly polarized light into linearly polarized light, so after the left-handed circularly polarized light 2 is processed by the second 1/4 wave plate 1023, the left-handed circularly polarized light 2 is converted into linearly polarized light 2 , the polarization direction of the linearly polarized light 2 is the X direction. Convert right-handed stray polarized light into linearly polarized stray polarized light.
  • the linearly polarized light 2 is perpendicular to the polarization direction of the linearly polarized stray polarized light, and the polarization direction of the linearly polarized stray polarized light is the Y direction.
  • the transmission direction of the first polarizer 1202 as the Y direction and block the polarized light in the X direction as an example.
  • the second polarization converter 1021 can transmit the polarized light 2 in the Y direction and the stray polarized light in the X direction output by the transmitted light component 102 . Furthermore, after passing through the first polarizer 1202, the stray polarized light in the X direction is eliminated, and the polarized light 2 in the Y direction is transmitted.
  • the polarization direction of the target polarized light output by the state adjustment component 110 is the X direction
  • the polarization direction of the stray polarized light is the Y direction
  • the transmission direction of the first polarizer 1202 is the Y direction direction to block the polarized light in the X direction.
  • control component 200 can control the first polarization converter 1201 to convert the polarized direction of the received polarized light, and convert the polarized direction of the target polarized light from the X direction to the Y direction, while the The polarization direction of the stray polarized light is converted from the Y direction to the X direction, so that after passing through the first polarizer 1202, the stray polarized light is filtered out and the target linearly polarized light is transmitted.
  • the switching of the optical power of the optical component is realized through the polarization direction of the polarized light output by the second polarization converter 101 .
  • the polarization direction of the output polarized light and the polarization direction of the stray polarized light are adjusted by the first polarization converter 1201 in combination with the second polarization converter 101 so that the polarization direction of the stray polarized light is positive to the transmission direction of the first polarizer 1202 cross, so that the stray polarized light is absorbed by the first polarizer 1202, and the stray polarized light is eliminated.
  • Table 1 takes the input of polarized light in the X direction as an example for illustration
  • Table 2 takes the input of polarized light in the Y direction as an example. It should be noted that Table 1 and Table 2 are only used as examples. For example, taking Table 1 as an example, input polarized light in the X direction, and if the second polarization converter can maintain the polarization direction of the input polarized light, the output target polarized light after the input polarized light passes through the second polarization converter
  • the polarization direction is the X direction.
  • the transmitted light component has positive optical power when inputting polarized light in the X direction, and outputs polarized light in the X direction; it has negative optical power when inputting polarized light in the Y direction, and outputs polarized light in the Y direction as an example. Then, after the target polarized light in the X direction is transmitted by the transmitted light component, the output target polarized light has negative optical power, that is, the divergent processing is performed on the input polarized light. After being transmitted by the transmitted light component, the polarization direction of the output target polarized light is the X direction, and stray polarized light in the Y direction is generated.
  • the second polarization converter can be adjusted through the control component, so that the second polarization converter can maintain the polarization direction of the input target polarized light, so that the first polarizer can output the target polarized light in the X direction, and output the target polarized light in the Y direction.
  • stray polarized light filtering can be applied to the control component, so that the second polarization converter can maintain the polarization direction of the input target polarized light, so that the first polarizer can output the target polarized light in the X direction, and output the target polarized light in the Y direction.
  • control component 200 can be, for example, a processor, a microprocessor, a controller and other control components, for example, it can be a general-purpose central processing unit (central processing unit, CPU), a general-purpose processor, a digital signal processing unit, etc. (digital signal processing, DSP), application specific integrated circuits (ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof .
  • CPU central processing unit
  • DSP digital signal processing
  • ASIC application specific integrated circuits
  • FPGA field programmable gate array
  • control component In a possible implementation manner, for the functions performed by the control component, reference may be made to the foregoing related description, and details are not repeated here.
  • the optical imaging system may further include a display component 300, which serves as an image source and provides display content for the optical imaging system, such as 3D content or interactive images.
  • the display component may include a VR lens barrel, a VR refraction optical path, an AR optical waveguide/light guide, a Birdbath reflective imaging optical path, or other image source providing components.
  • FIG. 6C it is taken that the display assembly 300 includes a VR lens barrel as an example.
  • the VR lens barrel includes a display screen 301 and a VR lens group 302 . At least one optical component may be arranged in the optical path in the VR barrel.
  • the optical path includes a front end, a middle end or a rear end
  • at least one optical component may be arranged at the front end, at the middle end, or at the rear end.
  • the end close to the input beam is called the front end
  • the end close to the output end is called the back end.
  • at least one optical component may be arranged at any position of the optical path, which is not specifically limited in this embodiment of the present application.
  • the optical state switching between the near focal plane and the far focal plane of the optical imaging system is realized.
  • the reference numerals of the components in the optical imaging system are not illustrated.
  • Example 1 the second polarization converter (ECPS1 is used as an example for the second polarization converter below) and the first polarization converter (ECPS2 is used as an example for the first polarization converter below) are used to convert The polarization direction of the input polarized light.
  • the second polarization converter and the first polarization converter are used as an example to maintain the polarization direction of the input polarized light when no power is applied.
  • the transmitted light component has negative power when inputting polarized light in the Y direction, outputs polarized light in the X direction, and has positive power when inputting polarized light in the X direction, and outputs polarized light in the Y direction.
  • the transmission direction of the first polarizer (the first polarizer is represented by polarizer 1 below) is the Y direction.
  • the control component can determine whether to switch the imaging position to the near focal plane or the far focal plane according to the scene where the displayed content is located, the gaze position of the human eye (which can be determined by the eye camera), or user settings. For example, in VR applications, in some short-distance scenes, such as office, reading, keyboard interaction, etc., the user needs to switch to the near-focus plane; in other long-distance applications, such as non-interactive games such as meetings, watching movies, and shooting etc., the user needs to switch to the far focal plane to reduce the uncomfortable feeling caused by the conflict of vergence adjustment. This application does not specifically limit it.
  • the optical imaging system is switched to the near focal plane.
  • the near focal plane has negative optical power.
  • the control component maintains the polarization direction of the input polarized light by controlling the ECPS1 to be in an unpowered state, so that the transmitted light component has a negative power for the input polarized light in the Y direction. While the transmitted light component outputs the target polarized light in the X direction, it also outputs the stray polarized light in the Y direction.
  • the control component controls the ECPS2 to be in the power-on state, so that the ECPS2 converts the input target polarized light in the X direction into the target polarized light in the Y direction, and converts the stray polarized light in the Y direction Converts to stray polarized light in the X direction.
  • the stray polarized light in the X direction is absorbed by the polarizer 1 .
  • the transmitted light component includes a first 1/4 wave plate (hereinafter, QWP1 is used as an example to represent the first 1/4 wave plate) and a second 1/4 wave plate (hereinafter, QWP2 is used to represent the second 1/4 wave plate). 4 wave plate as an example) and polarization dependent lens (PDL) as an example.
  • the optical axes of the fast axes of QWP1 and QWP2 coincide to convert the linearly polarized light in the Y direction into left-handed circularly polarized light, and convert the left-handed circularly polarized light into linearly polarized light in the Y direction.
  • Polarization-dependent lenses have negative optical power when inputting left-handed circularly polarized light, and positive optical power when inputting right-handed circularly polarized light.
  • the transmission direction of the first polarizer (the first polarizer is represented by polarizer 1 below) is the Y direction. Specifically, take Table 3 as an example for the light conversion conditions of each component.
  • the PDL needs to input right-handed circularly polarized light.
  • the control component controls ECPS1 to be in an unpowered state, so that after ECPS1 inputs linearly polarized light in the Y direction, it is still linearly polarized light in the Y direction after being transmitted through ECPS1 .
  • the linearly polarized light in the Y direction is converted into left-handed circularly polarized light, and then the left-handed circularly polarized light has negative optical power after passing through PDL, and the output target beam is converted into right-handed circularly polarized light, And stray polarized light is generated after PDL.
  • the stray polarized light is opposite to the polarization direction of the target beam, and is a left-handed stray polarized light.
  • the target beam in the right-handed direction is converted into linearly polarized light in the X direction after passing through QWP2, and the stray polarized light in the left-handed direction is converted into stray polarized light in the Y direction after passing through QWP2.
  • the control component controls the ECPS2 to be powered on.
  • the ECPS2 in the powered state converts the target beam in the X direction to the target beam in the Y direction, and the stray polarized light in the Y direction is converted into the stray polarized light in the X direction. Since the transmission direction of the first polarizer is the Y direction, the stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.
  • the optical imaging system is switched to the far focal plane.
  • the far focal plane has positive optical power.
  • the control component converts the polarization direction of the input polarized light by controlling the ECPS1 to be in the power-on state, so that the transmitted light component has positive optical power for the input polarized light in the X direction. While the transmitted light component outputs the target polarized light in the Y direction, it also outputs the stray polarized light in the X direction.
  • the control component controls the ECPS2 to be in an unpowered state, so that the ECPS2 maintains the input polarization direction of the target polarized light in the Y direction and the stray polarized light in the X direction.
  • the stray polarized light in the X direction is absorbed by the polarizer 1 .
  • the transmitted light component including QWP1 , QWP2 and polarization dependent lens (PDL) as an example.
  • the optical imaging system is switched to the far focal plane, and the far focal plane requires the PDL to have positive optical power, so the PDL needs to input right-handed circularly polarized light.
  • the control component controls ECPS1 to be in a power-on state, so that ECPS1 converts the target beam from linearly polarized light in Y direction to linearly polarized light in X direction after being transmitted by ECPS1 after inputting linearly polarized light in Y direction. Then after passing through QWP1, the linearly polarized light in the X direction is converted into right-handed circularly polarized light, and then the right-handed circularly polarized light has positive optical power after passing through PDL, and the output target beam is converted into left-handed circularly polarized light, and Stray polarized light is generated after passing through PDL.
  • the stray polarized light is opposite to the polarization direction of the target beam, and is right-handed stray polarized light.
  • the target beam in the left-handed direction is converted into linearly polarized light in the Y direction after passing through QWP2, and the stray polarized light in the right-handed direction is converted into stray polarized light in the X direction after passing through QWP2.
  • the control component controls the ECPS2 to be in an unpowered state.
  • the ECPS2 in the unpowered state transmits the target beam in the Y direction, and transmits stray polarized light in the X direction. Since the transmission direction of the polarizer 1 is the Y direction, the stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.
  • the close focus plane and Switching of the far focal plane in the case where the fast axes of QWP1 and QWP2 are orthogonal to each other, the close focus plane and Switching of the far focal plane.
  • the specific conversion of each component can be referred to in Table 4.
  • the optical imaging system is switched to the near focal plane. If the far focal plane has negative optical power, the PDL needs to input right-handed circularly polarized light. Take the target beam input by the display screen as linearly polarized light and the polarization direction as the Y direction as an example.
  • the control component controls ECPS1 to be in an unpowered state, so that after ECPS1 inputs linearly polarized light in the Y direction, it is still linearly polarized light in the Y direction after being transmitted through ECPS1 .
  • the linearly polarized light in the Y direction is converted into left-handed circularly polarized light, and then the left-handed circularly polarized light has negative optical power after passing through PDL, and the output target beam is converted into right-handed circularly polarized light, and Stray polarized light is generated after passing through PDL.
  • the stray polarized light is opposite to the polarization direction of the target beam, and is a left-handed stray polarized light.
  • the target beam in the right-handed direction is converted into linearly polarized light in the Y direction after passing through QWP2, and the stray polarized light in the left-handed direction is converted into stray polarized light in the X direction after passing through QWP2.
  • the control component controls the ECPS2 to be in an unpowered state.
  • the ECPS2 in the unpowered state transmits the target beam in the Y direction, and transmits stray polarized light in the X direction. Since the transmission direction of the polarizer 1 is the Y direction, the stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.
  • the control component controls ECPS1 to be in a power-on state, so that after ECPS1 inputs linearly polarized light in the Y direction, it converts the target beam from linearly polarized light in the Y direction to linearly polarized light in the X direction after being transmitted through ECPS1.
  • the linearly polarized light in the X direction is converted into right-handed circularly polarized light, and then the right-handed circularly polarized light has positive optical power after passing through PDL, and the output target beam is converted into left-handed circularly polarized light, And stray polarized light is generated after PDL.
  • the stray polarized light is opposite to the polarization direction of the target beam, and is right-handed stray polarized light.
  • the target beam in the left-handed direction is converted into linearly polarized light in the X direction after passing through QWP2, and the stray polarized light in the right-handed direction is converted into stray polarized light in the Y direction after passing through QWP2.
  • the control component controls the ECPS2 to be powered on.
  • the ECPS2 in the powered state converts the polarization direction of the target beam in the X direction to the Y direction, and converts the stray polarized light in the Y direction to the X direction. Since the transmission direction of the polarizer 1 is the Y direction, the stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.
  • FIGS. 7A and 7C Exemplarily, the elimination of stray polarized light intensity will be described with reference to FIGS. 7A and 7C .
  • the efficiencies of PDL and ECPS are represented by P PDL and P ECPS respectively.
  • the intensities of the respective rays are shown in Table 5 below.
  • I ghost, 0 represents the 0th-order ghost intensity
  • I ghost,-1 represents the 1st-order ghost intensity
  • the ghost image intensity is:
  • I Ghost,0 2(1-P PDL )(1-P ECPS )P ECPS ;
  • I Ghost,-1 (1-P ECPS ) 2 P PDL .
  • the switching of at most 2 N optical focal planes of the optical imaging system can be realized by coupling the N optical components provided in the embodiment of the present application in series.
  • PDLs in different optical components have different optical focal planes, which can realize the switching of 2 N optical focal planes.
  • the control component controls each transmitted light component to have a positive or negative refractive power by adjusting the polarization direction of the polarized light output by each second polarization converter in the N optical components, so that the imaging of the optical imaging system
  • the focal planes are switched among at most 2 N focal planes.
  • control component controls the PDL in each optical component to have positive or negative refractive power by controlling the ECPS of different optical components to be in a powered state or an unpowered state, thereby realizing the optical focus of the optical imaging system plane switching among the 2 N focal planes.
  • optical component 1 takes the transmitted light components including QWP1, QWP2 and PDL as an example.
  • the two optical components are referred to as optical component 1 and optical component 2.
  • the two polarization converters in optical component 1 are ECPS1 and ECPS2, the two QWPs in optical component 1 are QWP1 and QWP2, the PDL in optical component 1 is called PDL1, and the first polarizer in optical component 1 is called Polarizer 1.
  • Optical assembly 2 includes ECPS3, QWP3, PDL2, QWP4, ECPS4, polarizer 2.
  • control component controls the open (ON) or closed (OFF) state of the four ECPSs, or controls the powered or unpowered states of the four ECPSs. Can be understood as closed.
  • the optical imaging system can realize four optical powers of -3, -1, 1, and 3, thereby realizing four optical focal points in the near-eye device Face switching.
  • the solution provided by the embodiment of the present application can be used for the display of various 3D scenes, for example, generally select the range of the farthest 3 meters and the nearest 30 centimeters of the focal plane, and divide 4 light beams with equal focal power
  • the distance between the 8 focal planes can be: (0.3, 0.4, 0.62, 1.31, 3) meters.
  • a stray polarized light eliminating component is used to eliminate stray polarized light generated by multiple state adjusting components.
  • the stray polarized light generated by the two state adjustment components is eliminated by a stray polarized light eliminating component.
  • a stray polarized light eliminating component eliminates stray polarized light generated by two state adjusting components. It can be understood that the solution shown in Figure 10 can save one stray polarized light elimination component, but the ability to eliminate ghost images will be reduced compared with the use of two stray polarized light elimination components, but it can eliminate The main ghost image can generally reach the level that the human eye cannot feel.
  • the embodiments of the present application may implement switching between the AR state and the VR state of the optical imaging system.
  • the user needs to switch to the AR state in some scenarios, such as outdoors, complex environments, and interacting with real people and objects, while in other scenarios, such as immersive games, watching movies, etc. etc. Users prefer the VR state, so the switchable AR and VR states can better meet the needs of users.
  • by controlling the component to switch the polarization converter to the powered or unpowered state not only the switching of the AR state or the VR state can be realized, but also the switching of different focal planes for imaging in the AR state can be realized, or Realize the switching of different focal planes in VR state imaging.
  • the optical imaging system includes the two optical components described above.
  • the two optical components are referred to as a first optical component and a second optical component, respectively.
  • the optical imaging system also includes a second polarizer, the second polarizer is coupled with the first optical component, and the first optical component and the second optical component are coupled through an optical waveguide;
  • the optical imaging system further includes: a projection component, configured to input the polarized light of the image to the second optical component through the optical waveguide.
  • the projection component is used to provide image sources in AR state or VR state.
  • the second polarizer is used to convert the input natural light into polarized light, which is input to the first optical component.
  • the control component is specifically used to: make the optical imaging system in the AR state by controlling the first optical component to be in the working state and controlling the second optical component to be in the working state; or, by controlling the first optical component to be in the non-working state and controlling the second optical component to be in the working state
  • the optical components are in working condition, so that the optical imaging system is in VR state;
  • the first optical assembly when the first optical assembly is in the non-working state, the first optical assembly outputs the second polarized light generated by the first state adjustment assembly in the first optical assembly; when the first optical assembly is in the working state, the first optical assembly in the first optical assembly
  • the first stray light elimination component eliminates the stray polarized light generated by the first state adjustment component in the first optical component; when the second optical component is in the working state, the second stray polarized light elimination component in the second optical component eliminates the first The first state of the two optical components adjusts stray polarized light generated by the component.
  • control component can control the conversion state of the input polarized light by the two polarization converters, thereby controlling the optical component to be in a working state or a non-working state.
  • the natural light outputs the first polarized light after passing through the second polarizer.
  • the control component can output the first target polarized light (also called the target natural light) when the first polarized light is input (the output polarized light becomes natural polarized light after the natural light is processed by the second polarizer) by controlling the first state adjustment component. ; controlling the first stray polarized light eliminating component to adjust the polarization direction of the first target polarized light, so that the first stray polarized light eliminating component eliminates the first target polarized light, to prevent the first target polarized light from being input to the first target polarized light through the optical waveguide Two optical components. That is, natural light does not enter the second optical component.
  • the control component controls the second state adjusting component to output the second target polarized light and the first stray polarized light when the second polarized light is input, and the second state adjusting component also generates the first stray polarized light when outputting the second target polarized light , the polarization direction of the first stray polarized light is orthogonal to the second target polarized light; the second stray polarized light eliminating component is controlled to adjust the polarization direction of the first stray polarized light, so that the second stray polarized light eliminating component eliminates the first stray polarized light, and output the second target polarized light.
  • the natural light outputs the first polarized light after passing through the second polarizer.
  • the first state adjustment component is controlled to output the third target polarized light (ie target natural light) and the second stray polarized light when the first polarized light is input; the second stray polarized light is orthogonal to the polarization direction of the third target polarized light.
  • the target image light polarized light carrying image information
  • the third stray polarized light is orthogonal to the polarization direction of the fourth target polarized light
  • the second stray polarized light elimination component is controlled to adjust the polarization direction of the third stray polarized light, so that the first The second stray polarized light eliminating component eliminates the third stray polarized light and outputs the fourth target polarized light.
  • polarizers 1-3 are all used to transmit polarized light in the Y direction.
  • image light polarized light carrying image information, referred to as image light
  • ECPS3 Take imaging on the near focal plane as an example.
  • the transmitted light component has positive optical power when the polarized light in the Y direction is input, and outputs the polarized light in the X direction; it has negative optical power when the polarized light in the X direction is input, and outputs the polarized light in the Y direction.
  • the transmitted light component 2 needs to have a negative refractive power, so the transmitted light component 2 needs to input polarized light in the X direction.
  • the polarized light input to ECPS3 through the optical waveguide is in the Y direction, and the control component controls ECPS3 to convert the input target image light in the Y direction into the X direction, so that the target image light in the X direction is input to the transmitted light component 2, and the transmitted light component
  • the target image light is diverged, and the target image light in the Y direction and the stray polarized light in the X direction are output.
  • the ECPS4 is controlled by the control component to keep the polarization direction of the target image light in the Y direction and the stray polarized light in the X direction unchanged, so that the stray polarized light in the X direction is filtered by the polarizer 2 .
  • the natural light After passing through the polarizer 3, the natural light outputs target natural polarized light in the Y direction, referred to as target natural light. Since the natural light of the target does not need to have optical power, neither divergence nor convergence processing is required. Since the second optical component needs to have a negative optical power, based on this, the control component can control the first optical component to have a positive optical power, so that the target natural light has zero optical power after being transmitted through the first optical component and the second optical component.
  • the target natural light in the Y direction is input to ECPS1, and the control component controls ECPS1 to maintain the polarization direction of the input target natural light in the Y direction, so that after the target natural light in the Y direction is input to the transmitted light component 1, the transmitted light component performs the target natural light Convergence processing, output target natural light in X direction and stray polarized light in Y direction.
  • the ECPS2 is controlled by the control component to convert the target natural light in the X direction to the target natural light in the Y direction, and convert the polarization direction of the stray polarized light in the Y direction to the X direction, so that the stray polarized light in the X direction is filtered by the polarizer 1 .
  • the target natural light in the Y direction is input to the second optical assembly.
  • the target natural light in the Y direction and the target image light in the Y direction will be fused and then input to the second optical component.
  • this application implements In the examples, the transmission conditions of the target natural light and the target image light passing through the second optical component are described respectively.
  • the target natural light is input to ECPS3 through the optical waveguide, and ECPS3 converts the input target natural light in the Y direction to the X direction, so that after the target natural light in the X direction is input to the transmitted light component 2, the transmitted light component diverges the target natural light and outputs it in the Y direction Target natural light and stray polarized light in the X direction.
  • the polarization direction of the target natural light in the Y direction and the stray polarized light in the X direction is kept unchanged by controlling the ECPS4 through the control component, so that the stray polarized light in the X direction is filtered by the polarizer 2 .
  • the natural light In the VR state, it is necessary to prevent natural light from entering the human eye.
  • the natural light can be blocked by the first optical component, and the second optical component outputs the light of the target image and enters the human eye.
  • the transmission state of the polarized light carrying image information in the second optical component is similar to the transmission state in the AR state, and will not be repeated here.
  • the natural light After passing through the polarizer 3, the natural light outputs target natural polarized light in the Y direction, referred to as target natural light.
  • the direction of the target polarized light input into the polarizer 1 can be adjusted to be the X direction.
  • the target natural light in the Y direction is input to ECPS1, and the control component controls ECPS1 to maintain the polarization direction of the input target natural light in the Y direction, so that after the target natural light in the Y direction is input to the transmitted light component 1, the target natural light in the X direction is output.
  • the ECPS2 is controlled by the control component to keep the polarization direction of the target natural light in the X direction, so that the target polarized light in the X direction is filtered by the polarizer 1 .
  • FIG. 11B A schematic diagram of switching between the AR state and the VR state of the optical imaging system is as follows through FIG. 11C and FIG. 11D .
  • the two ECPSs included in the first optical assembly are respectively referred to as ECPS1 and ECPS2 as an example, and the two QWPs included in the first optical assembly are respectively referred to as QWP1 and QWP2 as an example.
  • the PDL included in the first optical assembly is referred to as PDL1 as an example.
  • the two ECPSs included in the second optical assembly are called ECPS3 and ECPS4 respectively.
  • the first optical assembly includes a polarizer 1 .
  • the two QWPs included in the second optical assembly are referred to as QWP3 and QWP4 respectively.
  • the PDL included in the second optical assembly is called PDL2 as an example.
  • the second optical assembly also includes a polarizer 2 .
  • the optical imaging system also includes a second polarizer, which is called the polarizer 3 in the following embodiments as an example.
  • control component controls the optical imaging system to be in the AR state to be described as follows.
  • control component can control the optical imaging system to image on the near focal plane or on the far focal plane in the AR state. Referring to FIG. 11C , the optical imaging system is described in the AR state imaging on the far focal plane.
  • the AR projection component inputs target display light to the second optical component.
  • the target display light is polarized light.
  • the far focal plane requires PDL to have positive power, so PDL2 needs to input right-handed circularly polarized light.
  • the control component controls the ECPS3 to be in the power-on state, so that after the ECPS3 inputs the linearly polarized light in the Y direction, it converts the target display light from the linearly polarized light in the Y direction to the X direction after being transmitted by the ECPS3 of linearly polarized light.
  • the linearly polarized light in the X direction is converted into right-handed circularly polarized light, and then the right-handed circularly polarized light has positive optical power after passing through PDL2, and the output target display light is converted into left-handed circularly polarized light, And stray polarized light is generated after passing through PDL2.
  • the stray polarized light is opposite to the polarization direction of the target display light, and is right-handed stray polarized light.
  • the target display light in the left-handed direction is converted into linearly polarized light in the Y direction after passing through the QWP4, and the stray polarized light in the right-handed direction is converted into stray polarized light in the X direction after passing through the QWP4.
  • the control component controls the ECPS2 to be in an unpowered state.
  • the ECPS4 in the unpowered state maintains the polarization direction of the target display light in the Y direction, and maintains the polarization direction of the stray polarized light in the X direction. Since the transmission direction of the polarizer 2 is the Y direction, the stray polarized light in the X direction is filtered out, and the target display light in the Y direction is output.
  • the target natural light passes through the optical imaging system and passes through the two optical components, it will not produce divergence or convergence. Due to the divergence effect after passing through the first optical component and the polymerization effect after passing through the second optical component, the target natural light does not diverge or converge after passing through the two optical components.
  • the target natural light passes through the polarizer 3 , it only passes through the target natural light in the Y direction, and the target natural light projected through the polarizer 3 is polarized light in the Y direction.
  • the PDL1 needs to input right-handed circularly polarized light.
  • the control component controls the ECPS1 to be in an unpowered state, so that after the ECPS1 inputs the linearly polarized light in the Y direction, it is still the linearly polarized light in the Y direction after being transmitted through the ECPS1.
  • the linearly polarized light in the Y direction is converted into left-handed circularly polarized light, and then the left-handed circularly polarized light has negative optical power after passing through PDL1, and the output target natural light is converted into right-handed circularly polarized light, And stray polarized light is generated after passing through PDL1.
  • Stray polarized light is opposite to the polarization direction of the target natural light, and is a left-handed stray polarized light.
  • the target natural light in the right-handed direction is converted into linearly polarized light in the X direction after passing through QWP2, and the stray polarized light in the left-handed direction is converted into stray polarized light in the Y direction after passing through QWP2.
  • the control component controls the ECPS2 to be powered on.
  • the ECPS2 in the power-on state converts the target natural light in the X direction to the target natural light in the Y direction, and converts the stray polarized light in the Y direction to the stray polarized light in the X direction.
  • the transmission direction of the polarizer 1 is the Y direction
  • the stray polarized light in the X direction is filtered out, and the target natural light in the Y direction is output.
  • the target display light is converted from the linearly polarized light in the Y direction to the linearly polarized light in the X direction.
  • the linearly polarized light in the X direction is converted into right-handed circularly polarized light, and then the right-handed circularly polarized light has negative optical power after passing through PDL2, and the output target display light is converted into left-handed circularly polarized light , and stray polarized light is generated after passing through PDL2.
  • the stray polarized light is opposite to the polarization direction of the target display light, and is right-handed stray polarized light.
  • the target display light in the left-handed direction is converted into linearly polarized light in the Y direction after passing through the QWP4, and the stray polarized light in the right-handed direction is converted into stray polarized light in the X direction after passing through the QWP4.
  • the control component controls the ECPS2 to be in an unpowered state.
  • the ECPS4 in the unpowered state transmits the target display light in the Y direction, and transmits stray polarized light in the X direction. Since the transmission direction of the polarizer 2 is the Y direction, the stray polarized light in the X direction is filtered out, and the target display light in the Y direction is output.
  • the target natural light passes through the PDL1 with positive optical power, and then passes through the PDL2 with negative optical power, so that no divergence or aggregation will occur.
  • FIG. 11D it is described by taking the optical imaging system in the AR state to image on the far focal plane.
  • the control component reverses the power-on or non-power-on states of all ECPSs in the embodiment shown in FIG. 11C , so that imaging on the far focal plane in the AR state can be realized. And no optical power is added for natural light, but only positive optical power is added for target display light.
  • the control component in the VR state can control the optical imaging system to image on the near focal plane or on the far focal plane.
  • the optical imaging system is described as imaging on the near focal plane in VR state.
  • the optical imaging system needs to control that natural light cannot pass through the first optical component and the second optical component, so that the target natural light will not enter the human eye through the optical imaging system.
  • the imaging of the optical imaging system in the VR state is described on the far focal plane.
  • the AR projection component inputs target display light to the second optical component.
  • the far focal plane requires PDL2 to have positive optical power, so the PDL needs to input left-handed circularly polarized light.
  • the target display light input by the projection component is linearly polarized light and the polarization direction is the Y direction.
  • the control component controls the ECPS3 to be in the power-on state, so that after the ECPS3 inputs the linearly polarized light in the Y direction, it converts the target display light from the linearly polarized light in the Y direction to the X direction after being transmitted by the ECPS3 of linearly polarized light.
  • the linearly polarized light in the X direction is converted into right-handed circularly polarized light, and then the right-handed circularly polarized light has positive optical power after passing through PDL2, and the output target display light is converted into left-handed circularly polarized light, And stray polarized light is generated after passing through PDL2.
  • the stray polarized light is opposite to the polarization direction of the target display light, and is right-handed stray polarized light.
  • the target display light in the left-handed direction is converted into linearly polarized light in the Y direction after passing through the QWP4, and the stray polarized light in the right-handed direction is converted into stray polarized light in the X direction after passing through the QWP4.
  • the control component controls the ECPS2 to be in an unpowered state.
  • the ECPS4 in the unpowered state transmits the target display light in the Y direction, and transmits stray polarized light in the X direction. Since the transmission direction of the polarizer 2 is the Y direction, the stray polarized light in the X direction is filtered out, and the target display light in the Y direction is output.
  • the control component needs to control the light-on state of ECPS1 and ECPS2, or the power-on and non-power-on states, so that the polarization direction of the target natural light input to the polarizer 1 is orthogonal to the polarization direction of the polarizer 1, so that the target natural light is polarized Sheet 1 is blocked and cannot pass through.
  • the control component can control ECPS1 and ECPS2 to be in the same switching state, for example, both are in a powered state or both are in an unpowered state. In FIG. 12A , ECPS1 and ECPS2 are both in a powered state as an example.
  • the control component controls ECPS1 to be in the power-on state, so that after ECPS1 inputs target natural light in the Y direction, it converts the target natural light from linearly polarized light in the Y direction to linear polarization in the X direction after being transmitted through ECPS1.
  • polarized light After passing through QWP1, the linearly polarized light in the X direction is converted into right-handed circularly polarized light, and then after the right-handed circularly polarized light passes through PDL1, the output target natural light is converted into left-handed circularly polarized light. The target natural light in the left-handed direction is converted into linearly polarized light in the Y direction after passing through QWP2.
  • the control component controls the ECPS2 to be powered on.
  • the ECPS2 in the powered state converts the target natural light in the Y direction to the target natural light in the X direction. Since the transmission direction of the polarizer 1 is the Y direction, the target natural light in the X direction is filtered, so that the target natural light is blocked from entering human eyes. It should be noted that, after the target natural light is transmitted through PDL1, stray polarized light may be generated. When part of the stray polarized light generated passes through the second optical component, part of the stray polarized light will be filtered out, making the human eye feel Less than significant stray polarized light.
  • the optical imaging system performs imaging on the near focal plane in the VR state.
  • the control component reverses the power-on or non-power-on states of all ECPSs in the embodiment shown in FIG. 12A , so that imaging on the far focal plane in the VR state can be realized.
  • the present application can realize switching between different FOVs of the optical imaging system. Since the resolution provided by the display device in the optical system is limited, under a smaller FOV, the virtual image can have a higher angular resolution, and the picture is clearer and more delicate, which is suitable for reading and browsing the web. Under a large FOV, although the clarity of the picture is reduced, the large FOV provides a better sense of immersion, which is suitable for scenes such as games. Taking support for switching between two viewing angles as an example, the two viewing angles are respectively called the first viewing angle and the second viewing angle.
  • the optical imaging system includes the two optical components described above. The two optical components are separated by a set distance.
  • the optical imaging system also includes a converging lens; the control component controls the transmitted light component of the first optical component to have a positive refractive power by controlling the polarization direction of the output polarized light of the second polarization converter of the first optical component in the two optical components, and controls The second polarization converter of the second optical component outputs the polarization direction of the polarized light to control the transmitted light component of the second optical component to have a negative refractive power, so that the light beam carrying the image information input to the optical imaging system passes through the converging lens and forms the visual image
  • the field angle is the first field angle; the first optical component and the second optical component are placed in sequence in the transmission direction of the optical path.
  • the control component controls the transmitted light component of the first optical component to have a negative optical power by controlling the polarization direction of the output polarized light of the second polarization converter of the first optical component, and controls the output polarization of the second polarization converter of the second optical component
  • the transmitted light component of the second optical component is controlled by the polarization direction of the light to have a positive refractive power, so that the angle of view of the light beam carrying image information input to the optical imaging system after passing through the converging lens is the first angle of view; the first field of view The angle is greater than the angle of the second field of view.
  • the two optical components are referred to as a first optical component and a second optical component, respectively.
  • the two ECPSs included in the first optical assembly are respectively referred to as ECPS1 and ECPS2 as an example, and the two QWPs included in the first optical assembly are respectively referred to as QWP1 and QWP2 as an example.
  • the PDL included in the first optical assembly is referred to as PDL1 as an example.
  • the two ECPSs included in the second optical assembly are called ECPS3 and ECPS4 respectively.
  • the first optical assembly includes a polarizer 1 .
  • the two QWPs included in the second optical assembly are referred to as QWP3 and QWP4 respectively.
  • the PDL included in the second optical assembly is called PDL2 as an example.
  • the second optical assembly also includes a polarizer 2. Taking the light conversion relationship of each component shown in Table 4 as an example, the control component controls the optical imaging system to be in the first field of view (large field of view) and the second field of view (small field of view) as an example.
  • the description is made with the optical imaging system imaging at the second viewing angle (small viewing angle).
  • a small field of view requires PDL1 to have positive optical power, and PDL2 to have negative optical power, then PDL1 needs to input left-handed circularly polarized light, and PDL2 needs to input right-handed circularly polarized light.
  • the control component controls ECPS1 to be in a power-on state, so that after ECPS1 inputs linearly polarized light in the Y direction, it converts the target beam from linearly polarized light in the Y direction to linearly polarized light in the X direction after being transmitted through ECPS1.
  • the linearly polarized light in the X direction is converted into right-handed circularly polarized light, and then the right-handed circularly polarized light has positive optical power after passing through PDL, and the input right-handed circularly polarized light is converged, and the output target
  • the light beam is converted into left-handed circularly polarized light, and stray polarized light (shortly referred to as stray light in FIG. 13A ) is generated after passing through the PDL.
  • the stray polarized light is opposite to the polarization direction of the target beam, and is a right-handed stray polarized light (referred to simply as stray light in FIG. 13A ).
  • the target beam in the left-handed direction is converted into linearly polarized light in the Y direction after passing through QWP2, and the stray polarized light in the right-handed direction is converted into stray polarized light in the X direction after passing through QWP2.
  • the control component controls the ECPS2 to be in an unpowered state.
  • the ECPS2 in the unpowered state transmits the target beam in the Y direction, and transmits stray polarized light in the X direction. Since the transmission direction of the polarizer 1 is the Y direction, the stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.
  • the control component controls ECPS3 to be in an unpowered state, so that after ECPS3 inputs linearly polarized light in the Y direction, it is still linearly polarized light in the Y direction after being transmitted through ECPS1 .
  • the linearly polarized light in the Y direction is converted into left-handed circularly polarized light, and then the left-handed circularly polarized light has negative optical power after passing through PDL2, and the input left-handed circularly polarized light is diverged and converged at PDL1 , and then after divergence processing in PDL2, the beam resumes parallel transmission.
  • PDL2 also converts left-handed circularly polarized light into right-handed circularly polarized light, and generates stray polarized light after passing through PDL2.
  • the stray polarized light is opposite to the polarization direction of the target beam, and is a left-handed stray polarized light.
  • the target beam in the right-handed direction is converted into linearly polarized light in the X direction after passing through the QWP4, and the stray polarized light in the left-handed direction is converted into stray polarized light in the Y direction after passing through the QWP4.
  • the control component controls the ECPS4 to be powered on.
  • the ECPS4 in the powered state converts the target beam in the X direction to the target beam in the Y direction, and converts the stray polarized light in the Y direction to the stray polarized light in the X direction. Since the transmission direction of the polarizer 2 is the Y direction, the stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.
  • the target light beam is projected through the converging lens and then converges on the human eye, so that the imaging field angle of the optical imaging system is the first field of view angle.
  • a large field of view requires PDL1 to have negative optical power, and PDL2 to have positive optical power, then PDL1 needs to input right-handed circularly polarized light, and PDL2 needs to input left-handed circularly polarized light.
  • the control component controls ECPS1 to be in an unpowered state, so that after ECPS1 inputs linearly polarized light in the Y direction, it is still linearly polarized light in the Y direction after being transmitted through ECPS1 .
  • the linearly polarized light in the Y direction is converted into left-handed circularly polarized light, and then after the left-handed circularly polarized light passes through PDL1, it has negative optical power, the diameter of the target beam is increased, and the output target beam is converted to right-handed Direction of circularly polarized light, and stray polarized light (referred to as stray light in FIG. 13B ) after passing through the PDL.
  • the stray polarized light is opposite to the polarization direction of the target beam, and is a left-handed stray polarized light.
  • the target beam in the right-handed direction is converted into linearly polarized light in the X direction after passing through QWP2, and the stray polarized light in the left-handed direction is converted into stray polarized light in the Y direction after passing through QWP2.
  • the control component controls the ECPS2 to be powered on.
  • the ECPS2 in the powered state converts the target beam in the X direction to the target beam in the Y direction, and the stray polarized light in the Y direction is converted into the stray polarized light in the X direction. Since the transmission direction of the first polarizer is the Y direction, the stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.
  • the diameter of the beam gradually decreases and enters the second optical component.
  • PDL2 needs to have negative optical power, and then PDL2 needs to input left-handed circularly polarized light.
  • the control component controls the ECPS3 to be in the power-on state, so that after the ECPS3 inputs the linearly polarized light in the Y direction, it converts the target beam from the linearly polarized light in the Y direction to the linearly polarized light in the X direction after being transmitted by the ECPS3.
  • the linearly polarized light in the X direction is converted into right-handed circularly polarized light, and then the right-handed circularly polarized light has positive optical power after passing through PDL2, and the target beam is converted into left-handed circularly polarized light, and passed through Stray polarized light is produced after PDL2.
  • the stray polarized light is opposite to the polarization direction of the target beam, and is right-handed stray polarized light.
  • the target beam in the left-handed direction is converted into linearly polarized light in the Y direction after passing through the QWP4, and the stray polarized light in the right-handed direction is converted into stray polarized light in the X direction after passing through the QWP4.
  • the control component controls the ECPS4 to be in an unpowered state.
  • the ECPS4 in the unpowered state transmits the target beam in the Y direction, and transmits stray polarized light in the X direction. Since the transmission direction of the polarizer 2 is the Y direction, the stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.
  • the embodiment of the present application further provides a control method, which is applied to a wearable device.
  • the wearable device is in the state of the near focal plane or the far focal plane.
  • the wearable device includes optical components including a state regulation component and a stray polarized light cancellation component. See Figure 14:
  • Control the stray polarized light eliminating component to adjust the polarization direction of the first stray polarized light, so that the stray polarized light eliminating component eliminates the first stray polarized light and outputs the first target polarized light.
  • the first target polarized light is orthogonal to the second target polarized light.
  • the stray polarized light eliminating component includes a second polarization converter and a first polarizer, the first polarizer only transmits polarized light in the first polarization direction; the first stray polarized light has a second polarized light direction and the first target polarized light has a first polarization direction, the second stray polarized light has a first polarization direction and the second target polarized light has a first polarization direction;
  • control the stray polarized light elimination component to adjust the polarization direction of the second stray polarized light it can be achieved in the following way: control the second target of the output of the second polarization converter conversion state adjustment component
  • the polarization direction of the polarized light is the first polarization direction
  • the polarization direction of the second stray polarized light output by the switching state adjustment component is the second polarization direction, so that the first polarizer eliminates the second stray polarized light.
  • the stray polarized light elimination component includes a second polarization converter and a first polarizer, and the first polarizer only transmits polarized light in the second polarization direction; the first stray polarized light has a second polarized light a polarization direction and the first target polarized light has a first polarization direction, the second stray polarized light has a first polarization direction and the second target polarized light has a first polarization direction;
  • Controlling the stray polarized light elimination component to adjust the polarization direction of the first stray polarized light can be achieved in the following manner: controlling the polarization direction of the first target polarized light output by the second polarization converter to switch the state adjustment component to be the second polarization direction, And the polarization direction of the first stray polarized light output by the switching state adjustment component is the first polarized direction, so that the first polarizer eliminates the first stray polarized light.
  • Controlling the stray polarized light elimination component to adjust the polarization direction of the second stray polarized light is achieved by controlling the polarization direction of the polarized light output by the second polarization converter to maintain the state adjustment component, so that the first polarizer eliminates the second stray polarized light Scatter polarized light.
  • the wearable device is in AR state or VR state.
  • the wearable device sequentially includes a first optical component, an optical waveguide, and a second optical component in the propagation direction of the optical path;
  • the first optical component includes a first state adjustment component and a first stray polarized light elimination component, and the first optical component
  • the second optical assembly includes a second state adjustment assembly and a second stray polarized light elimination assembly.
  • the wearable device is in the VR state.
  • Control the first stray polarized light eliminating component to adjust the polarization direction of the first target polarized light, so that the first stray polarized light eliminating component eliminates the first target polarized light, so as to prevent the the first target polarized light is input to the second optical component through the optical waveguide;
  • Control the second stray polarized light eliminating component to adjust the polarization direction of the first stray polarized light, so that the second stray polarized light eliminating component eliminates the first stray polarized light, and output The second target polarized light.
  • the wearable device is in the AR state.
  • the optical waveguide outputs the third target polarized light to the second optical component
  • Control the second state adjustment component to output a fourth target polarized light and a third stray polarized light when the third polarized light is input;
  • the third polarized light includes the third target polarized light and the second polarized light polarized light; the polarization directions of the third stray polarized light and the fourth target polarized light are orthogonal;
  • Control the second stray polarized light eliminating component to adjust the polarization direction of the third stray polarized light, so that the second stray polarized light eliminating component eliminates the third stray polarized light, and output The fourth target polarized light.
  • the wearable device is in a large FOV state or a small FOV state.
  • the wearable device includes a first optical component and a second optical component, the first optical component is coupled to the second optical component and the first optical component is separated from the second optical component by a set distance, the first optical component includes a first state adjustment component and The first stray polarized light eliminating component, the second optical component includes a second state adjusting component and a second stray polarized light eliminating component.
  • the first viewing angle state of the wearable device When the first viewing angle state of the wearable device is turned on, control the first state adjustment component to perform divergence processing on the polarized light, so that the first state adjustment component outputs the first target polarized light and the first stray polarized light, the first A stray polarized light is orthogonal to the polarization direction of the first target polarized light.
  • Control the first stray polarized light eliminating component to adjust the polarization direction of the first stray polarized light, so that the first stray polarized light eliminating component eliminates the first stray polarized light, and output the first target to the second optical component polarized light.
  • Control the second stray polarized light eliminating component to adjust the polarization direction of the second stray polarized light, so that the second stray polarized light eliminating component eliminates the second stray polarized light and outputs the second target polarized light.
  • control the first stray polarized light eliminating component to adjust the polarization direction of the third stray polarized light, so that the first stray polarized light eliminating component eliminates the third stray polarized light, and output the third target to the second optical component polarized light;
  • Control the second stray polarized light eliminating component to adjust the polarization direction of the fourth stray polarized light, so that the second stray polarized light eliminating component eliminates the fourth stray polarized light and output the fourth target polarized light.
  • the method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions.
  • Software instructions can be composed of corresponding software modules, and software modules can be stored in random access memory (random access memory, RAM), flash memory, read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM) , PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically erasable programmable read-only memory (electrically EPROM, EEPROM), register, hard disk, mobile hard disk, CD-ROM or known in the art any other form of storage medium.
  • An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium.
  • the storage medium may also be a component of the processor.
  • the processor and storage medium can be located in the ASIC.
  • the ASIC may be located in a head-mounted display device or a terminal device.
  • the processor and the storage medium may also exist in the head-mounted display device or the terminal device as discrete components.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, network equipment, user equipment, or other programmable devices.
  • the computer program or instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer program or instructions may be downloaded from a website, computer, A server or data center transmits to another website site, computer, server or data center by wired or wireless means.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrating one or more available media. Described usable medium can be magnetic medium, for example, floppy disk, hard disk, magnetic tape; It can also be optical medium, for example, digital video disc (digital video disc, DVD); It can also be semiconductor medium, for example, solid state drive (solid state drive) , SSD).
  • At least one means one or more, and “multiple” means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural.
  • “At least one of the following” or similar expressions refer to any combination of these items, including any combination of single or plural items.
  • at least one item (piece) of a, b or c can mean: a, b, c, "a and b", “a and c", “b and c", or "a and b and c ", where a, b, c can be single or multiple.
  • the character “/” generally indicates that the contextual objects are an “or” relationship. In the formulas of this application, the character “/” indicates that the front and back related objects are in a “division” relationship.
  • the symbol “(a, b)” means an open interval, the range is greater than a and less than b; "[a, b]” means a closed interval, the range is greater than or equal to a and less than or equal to b; "(a , b]” means a half-open and half-closed interval, the range is greater than a and less than or equal to b; “(a, b]” means a half-open and half-closed interval, the range is greater than a and less than or equal to b.
  • exemplary is used to mean an example, illustration, or illustration. Any embodiment or design described in this application as “exemplary” should not be construed as preferred or more preferred than other embodiments or designs. Or it can be understood that the use of the word example is intended to present a concept in a specific manner, and does not constitute a limitation to the application.

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

Abstract

L'invention concerne un système d'imagerie optique et un procédé de commande, qui sont utilisés pour éliminer la lumière parasite produite pendant un procédé de réglage d'état de faisceau lumineux. Un ensemble de commande (200) commande un ensemble de régulation d'état (110) pour effectuer une régulation d'état de faisceau lumineux sur une lumière polarisée entrée, de façon à délivrer en sortie une lumière polarisée cible et une lumière polarisée parasite, la direction de polarisation de la lumière polarisée parasite étant orthogonale à celle de la lumière polarisée cible ; puis un ensemble d'élimination de lumière polarisée parasite (120) est commandée en fonction de la direction de polarisation de la lumière polarisée parasite, de telle sorte que l'ensemble d'élimination de lumière polarisée parasite (120) ajuste la direction de polarisation de la lumière polarisée parasite sous la commande de l'ensemble de commande (200), de manière à éliminer la lumière polarisée parasite et à délivrer en sortie la lumière polarisée cible. Le système d'imagerie optique et le procédé de commande sont utilisés pour éliminer la lumière parasite produite par un système d'affichage à états multiples.
PCT/CN2022/112224 2021-08-16 2022-08-12 Système d'imagerie optique et procédé de commande WO2023020399A1 (fr)

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CN112255794A (zh) * 2020-10-28 2021-01-22 上海悠睿光学有限公司 光学模组、近眼显示装置和光投射方法
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Publication number Priority date Publication date Assignee Title
CN104903777A (zh) * 2012-11-21 2015-09-09 拉斯特公司 增强现实光学模块
CN114690429A (zh) * 2017-02-23 2022-07-01 奇跃公司 基于偏振转换的可变焦虚拟图像设备
CN112189155A (zh) * 2018-03-15 2021-01-05 脸谱科技有限责任公司 利用偏振器提高Pancharatnam Berry相位部件的图像质量
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CN112255794A (zh) * 2020-10-28 2021-01-22 上海悠睿光学有限公司 光学模组、近眼显示装置和光投射方法

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