Optical imaging system and control method

Abstract

The application provides an optical imaging system and a control method to eliminate stray light generated in a light beam state adjustment process. A control component controls a state adjustment component to adjust the state of input polarized light to output target polarized light and stray polarized light, the polarization direction of the stray polarized light being orthogonal to that of the target polarized light, and then controls a stray polarized light elimination component according to the polarization direction of the stray polarized light, so that the stray polarized light elimination component adjusts the polarization direction of the stray polarized light under the control of the control component to eliminate the stray polarized light and output the target polarized light.

Description

Technical Field

[0001] This application relates to the field of optical technology, and in particular to an optical imaging system and control method. Background Technology

[0002] Near-eye display (NED) systems, including augmented reality (AR) / virtual reality (VR) display systems, employ novel display technologies that directly display AR / VR content to both eyes. However, the image display accuracy of NED systems is limited by the existence of vergence-accommodation conflict (VAC) and the requirement for a large field of view (FoV). To address these issues, existing systems provide multi-state display systems that switch between different display states according to display needs, such as switching optical power to display objects that are farther or closer. However, when switching from one display state to another, afterimages from the previous state are introduced; these afterimages are a form of stray light. Currently, there is no feasible method to remove the stray light generated by multi-state display systems. Summary of the Invention

[0003] This application provides an optical imaging system and control method for removing stray light generated by a multi-state display system.

[0004] In a first aspect, embodiments of this application provide an optical imaging system, including an optical component and a control component. The optical component includes a state adjustment component and a stray polarization elimination component. The state adjustment component is used to adjust the beam state of the input polarized light under the control of the control component to output target polarized light and stray polarized light, wherein the polarization direction of the stray polarized light is orthogonal to that of the target polarized light. The stray polarization elimination component is used to receive the target polarized light and stray polarized light, and adjust the polarization direction of the stray polarized light under the control of the control component, thereby eliminating stray polarized light and outputting target polarized light.

[0005] Based on the above scheme, when the state adjustment component adjusts the beam state to generate stray polarized light, the control component adjusts the polarization direction of the input stray polarized light by the stray polarization elimination component, thereby outputting the target polarized light and filtering out the stray polarized light.

[0006] In one possible design, the stray polarization elimination component includes a first polarization converter and a first polarizer, the first polarizer transmitting only polarized light with a first polarization direction; a control component is specifically configured to: control the first polarization converter to maintain the polarization direction of the polarized light output by the state adjustment component when the target polarized light output by the state adjustment component has a first polarization direction and the stray polarized light has a second polarization direction; or, control the first polarization converter to convert the polarization direction of the target polarized light output by the state adjustment component to the first polarization direction and the polarization direction of the stray polarized light output by the state adjustment component to the second polarization direction when the target polarized light output by the state adjustment component has a second polarization direction and the stray polarized light has a first polarization direction; wherein the first polarization direction and the second polarization direction are orthogonal.

[0007] Through the above design, the control component controls the first polarization converter in the stray polarization elimination component to make the polarization direction of the target polarized light the same as the transmission direction of the first polarizer, and the polarization direction of the stray polarized light orthogonal to the transmission direction of the first polarizer, thereby enabling the first polarizer to filter out stray polarized light and output the target polarized light.

[0008] In one possible design, the first polarization converter is any one of a nematic liquid crystal cell, an orthogonally arranged VA liquid crystal cell, a flat-panel conversion IPS liquid crystal cell, an electrically controlled twisted nematic TN liquid crystal cell, an electrically controlled nonlinear crystal, or an electrically controlled ferroelectric liquid crystal cell.

[0009] In one possible design, the 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 polarization direction of the polarized light output by the state adjustment component; or, control the first polarization converter to be in a powered state, so that the first polarization converter switches the polarization direction of the target polarized light output by the state adjustment component to the first polarization direction, and switches the polarization direction of the stray polarized light output by the state adjustment component to the second polarization direction.

[0010] In one possible design, the control component is specifically used to: control the first polarization converter to be in an energized state, such that the first polarization converter maintains the polarization direction of the polarized light output by the state adjustment component; or, control the first polarization converter to be in an unenergized state, such that the first polarization converter switches the polarization direction of the target polarized light output by the state adjustment component to the first polarization direction, and switches the polarization direction of the stray polarized light output by the state adjustment component to the second polarization direction.

[0011] In the above design, the control component controls the energized or de-energized state of the first polarization converter, thereby adjusting the polarization direction of the input polarized light by the first polarization converter, and thus enabling the first polarizer to filter out stray polarized light and output target polarized light.

[0012] In one possible design, the state adjustment component includes a second polarization converter and a transmission light component. Specifically, the control component controls the second polarization converter to adjust the polarization direction of the input polarized light, so that the target polarized light output by the transmission light component has a third polarization direction or a fourth polarization direction; wherein the third polarization direction and the fourth polarization direction are orthogonal. In the above design, the control component can control the polarization direction of the second polarization converter, thereby determining the polarization direction of the target polarized light output by the transmission light component. It can also determine the polarization direction of stray polarized light, allowing the control component to further control the stray polarization light elimination component to filter out stray polarized light and output the target polarized light.

[0013] In one possible design, the transmitted light component is specifically used to diverge or converge the input polarized light under the control of the control component. Exemplarily, the control component can control the polarization direction of the input polarized light to achieve the divergence or convergence of the input polarized light, thereby adjusting the beam state of the input polarized light.

[0014] In some embodiments, the transmitted light component may support switching between diverging and parallel, or between diverging and converging, or between converging and parallel.

[0015] In one possible design, the transmission light assembly includes, in sequence, a first quarter-wave plate, a polarizing lens, and a second quarter-wave plate in the direction of light propagation. The polarizing lens is any one of a liquid crystal lens, a liquid crystal geometric phase lens, a metasurface polarizing lens, or a metasurface geometric phase lens.

[0016] In one possible design, the fast axis optical axis of the first quarter-wave plate coincides with the fast axis optical axis of the second quarter-wave plate; the control component is specifically used to control the enable state of the second polarization converter to be opposite to that of the first polarization converter. Exemplarily, when the first polarization converter is enabled, the second polarization converter is disabled, or when the first polarization converter is disabled, the second polarization converter is enabled. In some embodiments, enabling can be understood as being powered on, and disabling can be understood as not being powered on.

[0017] In one possible design, the fast axis optical axis of the first quarter wave plate is orthogonal to the fast axis optical axis of the second quarter wave plate; the control component is specifically used to control the second polarization converter to have the same enable state as the first polarization converter.

[0018] In the above design, the control component only needs to control the second polarization converter to be in the opposite enable state to the first polarization converter to enable the optical component to eliminate stray polarized light and output target polarized light.

[0019] In some embodiments, the control component enables the transmission light component to adjust the beam state by controlling the enable state of the second polarization converter, and outputs the desired target polarized light. Since the transmission light component generates stray polarized light when adjusting the beam state, the control component further controls the enable state of the first polarization converter so that the stray polarized light is filtered out by the first polarizer.

[0020] In one possible design, the optical imaging system includes N optical components, where N is a positive integer; the optical imaging system supports imaging in at most... Any one of the N optical focal planes; a control component, specifically used to control the beam state of the target polarized light output by the state adjustment components of each of the N optical components, so that the optical focal plane of the imaging system is at most [number missing] focal planes. Switching between multiple optical focal planes. Through the above design, up to N optical components are connected in series to achieve... Switching between optical focal planes. For example, when N optical components support different optical powers, it is possible to achieve... Switching between different focal planes.

[0021] In one possible design, the optical imaging system includes at least two optical components spaced a predetermined distance apart; the optical imaging system supports a first field of view and a second field of view; the optical imaging system also includes a converging lens; a control component, specifically configured to control a state adjustment component included in the first optical component to have a negative optical power (or control the state adjustment component to diverge the input polarized light), and to control a state adjustment component included in the second optical component to have a positive optical power (or control the state adjustment component to converge the input polarized light), such that the field of view of the polarized light carrying image information input to the optical imaging system after passing through the converging lens is the first field of view; the first and second optical components are placed sequentially in the optical path propagation direction; or, specifically configured to control a state adjustment component included in the first optical component to have a positive optical power, and to control a state adjustment component included in the second optical component to have a negative optical power, such that the field of view of the polarized light carrying image information input to the optical imaging system after passing through the converging lens is the second field of view; the first field of view is greater than the second field of view.

[0022] Through the above design, the control component controls the first optical component to diverge the input polarized light, transmit it at predetermined intervals, then continue to increase the beam width, and then controls the second optical component to converge the light, resulting in parallel output light. This light then passes through a focusing lens to output target polarized light with a large field of view. Alternatively, the control component controls the first optical component to converge the input polarized light, transmit it at predetermined intervals, then continue to reduce the beam width, and then controls the second optical component to diverge the light, resulting in parallel output light. This light then passes through a focusing lens to output target polarized light with a small field of view. Furthermore, each optical component can eliminate stray polarized light, thus eliminating stray polarized light while switching the field of view.

[0023] In one possible design, the optical imaging system includes at least two optical components. The system also includes a second polarizer coupled to a first optical component, which in turn is coupled to the second optical component via an optical waveguide. The first optical component, the optical waveguide, and the second optical component are arranged sequentially along the optical path. The optical imaging system supports both AR and VR modes. Furthermore, the system includes: a projection component for inputting polarized light from an image to the second optical component via the optical waveguide; a second polarizer for converting input natural light into polarized light and inputting it to the first optical component; and a control component. The system is used to: control the first optical component to be in an active state and control the second optical component to be in an active state, thereby enabling the optical imaging system to be in an AR state; or, control the first optical component to be in a non-active state and control the second optical component to be in an active state, thereby enabling the optical imaging system to be in a VR state; wherein, when the first optical component is in a non-active state, the stray polarization elimination component of the first optical component is used to eliminate the target polarized light; when the first optical component is in an active state, the stray polarization elimination component of the first optical component is used to eliminate stray polarized light; when the second optical component is in an active state, the stray polarization elimination component of the second optical component is used to eliminate stray polarized light.

[0024] Through the above design, the first optical component is controlled to eliminate the input naturally polarized light, that is, to prevent naturally polarized light from incident on the second optical component, thereby enabling the optical imaging system to be in VR mode. Additionally, the first optical component is controlled to allow the output naturally polarized light, i.e., the naturally polarized light, to be incident on the second optical component and merge with the image polarized light, thereby enabling the optical imaging system to be in AR mode.

[0025] Secondly, embodiments of this application provide a control method applied to a wearable device. The wearable device includes an optical component, which includes a state adjustment component and a stray polarization elimination component. The method receives polarized light carrying image information and inputs it to the state adjustment component. When the near-focal surface state of the wearable device is activated, the state adjustment component is controlled to perform divergence processing on the input polarized light, causing the state adjustment component to output a first target polarized light and a first stray polarized light. The polarization directions of the first stray polarized light and the first target polarized light are orthogonal. The stray polarization elimination component is controlled to adjust the polarization direction of the first stray polarized light. The system works as follows: When the wearable device's far-focus state is activated, the control state adjustment component converges the input polarized light, causing it to output a second target polarized light and a second stray polarized light. The polarization directions of the second stray polarized light and the second target polarized light are orthogonal. The control state adjustment component adjusts the polarization direction of the second stray polarized light to eliminate it and output the second target polarized light. The first target polarized light and the second target polarized light are orthogonal. This method eliminates stray polarized light while switching between near-focus and far-focus states.

[0026] In one possible design, the stray polarization elimination component includes a second polarization converter and a first polarizer, the first polarizer transmitting only polarized light with a 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; controlling the stray polarization elimination component to adjust the polarization direction of the first stray polarized light includes: controlling the second polarization converter to maintain the polarization direction of the polarized light output by the state adjustment component, so that the first polarizer eliminates the first stray polarized light; controlling the stray polarization elimination component to adjust the polarization direction of the second stray polarized light includes: controlling the second polarization converter to switch the polarization direction of the second target polarized light output by the state adjustment component to the first polarization direction, and switching the polarization direction of the second stray polarized light output by the state adjustment component to the second polarization direction, so that the first polarizer eliminates the second stray polarized light.

[0027] In one possible design, the stray polarization elimination component includes a second polarization converter and a first polarizer, the first polarizer transmitting only polarized light with a second 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; controlling the stray polarization elimination component to adjust the polarization direction of the first stray polarized light includes: controlling the polarization direction of the first target polarized light output by the second polarization converter's switching state adjustment component to be the second polarization direction, and controlling the polarization direction of the first stray polarized light output by the switching state adjustment component to be the first polarization direction, so that the first polarizer eliminates the first stray polarized light. Controlling the stray polarization 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's holding state adjustment component to be the second stray polarized light, so that the first polarizer eliminates the second stray polarized light.

[0028] In one possible design, controlling the second polarization converter to maintain the polarization direction of the polarized light output by the state adjustment component includes: controlling the second polarization converter to be in an energized state, such that the second polarization converter maintains the polarization direction of the polarized light output by the state adjustment component; controlling the second polarization converter to change the polarization direction of the second target polarized light output by the state adjustment component to a first polarization direction, and to change the polarization direction of the second stray polarized light output by the state adjustment component to a second polarization direction, includes: controlling the second polarization converter to be in an unenergized state, such that the second polarization converter changes the polarization direction of the second target polarized light output by the state adjustment component to the first polarization direction, and to change the polarization direction of the second stray polarized light output by the state adjustment component to the second polarization direction.

[0029] Thirdly, embodiments of this application provide a control method applied to a wearable device. The wearable device sequentially includes a first optical component, an optical waveguide, and a second optical component along the optical path propagation direction. The first optical component includes a first state adjustment component and a first stray polarization elimination component, and the second optical component includes a second state adjustment component and a second stray polarization elimination component. The method receives first polarized light converted from natural light and inputs it into the first optical component, and receives second polarized light carrying image information and inputs it into the second optical component through the optical waveguide. When the virtual reality (VR) state of the wearable device is activated, the method controls the first state adjustment component to output first target polarized light when the first polarized light is input. The system controls the first stray polarization elimination component to adjust the polarization direction of the first target polarized light so that the first stray polarization elimination component eliminates the first target polarized light, thereby preventing the first target polarized light from being input into the second optical component through the optical waveguide; the system controls the second state adjustment 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 adjustment component also generates the first stray polarized light when outputting the second target polarized light, the polarization direction of the first stray polarized light being orthogonal to the polarization direction of the second target polarized light; the system controls the second stray polarization elimination component to adjust the polarization direction of the first stray polarized light so that the second stray polarization elimination component eliminates the first stray polarized light and outputs the second target polarized light.

[0030] By combining the two optical components described above, stray polarized light can be eliminated in VR state.

[0031] Fourthly, embodiments of this application provide a control method applied to a wearable device. The wearable device sequentially includes a first optical component, an optical waveguide, and a second optical component in the optical path propagation direction. The first optical component includes a first state adjustment component and a first stray polarization light elimination component, and the second optical component includes a second state adjustment component and a second stray polarization light elimination component. The method receives first polarized light converted from natural light and inputs it into the first optical component, and receives second polarized light carrying image information and inputs it into the second optical component. When the augmented reality (AR) state of the wearable device is activated, the method controls the first state adjustment component to output a third target polarized light and a second stray polarized light when the first polarized light is input. The polarization directions of the stray polarized light and the third target polarized light are orthogonal. The first stray polarization elimination component is controlled to adjust the polarization direction of the second stray polarized light, so that the first stray polarization elimination component eliminates the second stray polarized light, and the third target polarized light is output through the light waveguide second optical component. The second state adjustment component is controlled to output the fourth target polarized light and the 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. The polarization directions of the third stray polarized light and the fourth target polarized light are orthogonal. The second stray polarization elimination component is controlled to adjust the polarization direction of the third stray polarized light, so that the second stray polarization elimination component eliminates the third stray polarized light, and the fourth target polarized light is output. Through the above scheme, combined with two optical components, stray polarized light can be eliminated in AR state.

[0032] Fifthly, embodiments of this application provide a control method applied to a wearable device. The wearable device includes a first optical component and a second optical component, the first optical component being coupled to the second optical component and spaced apart by a predetermined distance. The first optical component includes a first state adjustment component and a first stray polarization elimination component, and the second optical component includes a second state adjustment component and a second stray polarization elimination component. The method receives polarized light carrying image information and inputs it into the first optical component. When the first field of view of the wearable device is activated, the method controls the first state adjustment component to perform divergence processing on the polarized light, so that the first state adjustment component outputs a first target polarized light and a first stray polarized light. The light source consists of two optical components. The first stray polarized light has a polarization direction orthogonal to the first target polarized light. A first stray polarization elimination component is controlled to adjust the polarization direction of the first stray polarized light, thus eliminating it and outputting the first target polarized light to a second optical component. A second state adjustment component is controlled to converge the first target polarized light, resulting in the output of both the second target polarized light and the second stray polarized light, with the polarization direction of the second stray polarized light orthogonal to the second target polarized light. The second stray polarization elimination component is then controlled to adjust the polarization direction of the second stray polarized light, eliminating it and outputting the second target polarized light. This scheme, combining two optical components, can eliminate stray polarized light at a large field of view.

[0033] Sixthly, embodiments of this application provide a control method applied to a wearable device. The wearable device includes a first optical component and a second optical component, the first optical component being coupled to the second optical component and spaced apart by a predetermined distance. The first optical component includes a first state adjustment component and a first stray polarization elimination component, and the second optical component includes a second state adjustment component and a second stray polarization elimination component. The method receives polarized light carrying image information and inputs it into the first optical component. When the second field of view of the wearable device is activated, the method controls the first state adjustment component to converge the polarized light, causing the first state adjustment component to output a third target polarized light and a third stray polarized light. The third stray polarized light and the third target polarized light are orthogonal in polarization direction. The first stray polarization elimination component is controlled to adjust the polarization direction of the third stray polarized light, so that the first stray polarization elimination component eliminates the third stray polarized light and outputs the third target polarized light to the second optical component. The second state adjustment component is controlled to diverge the third target polarized light, so that the second state adjustment component outputs a fourth target polarized light and a fourth stray polarized light, the polarization direction of the fourth stray polarized light being orthogonal to the fourth target polarized light. The second stray polarization elimination component is controlled to adjust the polarization direction of the fourth stray polarized light, so that the second stray polarization elimination component eliminates the fourth stray polarized light and outputs the fourth target polarized light. Through the above scheme, combined with two optical components, stray polarized light can be eliminated at a small field of view.

[0034] Seventhly, this application provides a control device for implementing any one of the methods in aspects two through six above, comprising corresponding functional modules, each for implementing the steps in the above methods. The functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0035] Eighthly, this application provides a computer-readable storage medium storing a computer program or instructions that, when executed by a head-mounted display device, cause the head-mounted display device to perform any possible implementation of the methods in the second to sixth aspects described above.

[0036] Ninthly, this application provides a computer program product comprising a computer program or instructions that, when executed by a terminal device, implement the methods in any possible implementations of the second to sixth aspects described above.

[0037] The technical effects that can be achieved by any of the second to ninth aspects mentioned above can be referred to the description of the beneficial effects in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of an optical imaging system structure provided in an embodiment of this application; Figure 2 This is a schematic diagram of a stray polarization elimination component structure provided in an embodiment of this application; Figure 3 This is a schematic diagram of a state adjustment component structure provided in an embodiment of this application; Figure 4 This is a schematic diagram of another optical imaging system structure provided in an embodiment of this application; Figure 5A This is a schematic diagram of another state adjustment component structure provided in an embodiment of this application; Figure 5B This is a schematic diagram of the beam transmission state in the optical component provided in the embodiments of this application; Figure 6A This is a schematic diagram of the optical component structure provided in an embodiment of this application; Figure 6B This is a schematic diagram of the beam transmission state in the optical component provided in the embodiments of this application; Figure 6C This is a schematic diagram showing the position of the optical components in the lens barrel according to an embodiment of this application; Figure 7A This is a schematic diagram of the beam transmission state in the near-focal plane state provided in an embodiment of this application; Figure 7B This is a schematic diagram of the beam transmission state in the near-focal plane state provided in an embodiment of this application; Figure 7C This is a schematic diagram of the beam transmission state under the far focal plane state provided in an embodiment of this application; Figure 7D This is a schematic diagram of the beam transmission state under the far focal plane state provided in an embodiment of this application; Figure 8A This is a schematic diagram of the beam transmission state in the near-focal plane state provided in an embodiment of this application; Figure 8B This is a schematic diagram of the beam transmission state under the far focal plane state provided in an embodiment of this application; Figure 9 Schematic diagrams of different beam transmission states under the focal plane provided for embodiments of this application; Figure 10 This is a schematic diagram of another optical imaging system structure provided in an embodiment of this application; Figure 11A This is a schematic diagram of another optical imaging system structure provided in the embodiments of this application; Figure 11B This is a schematic diagram of another optical imaging system structure provided in the embodiments of this application; Figure 11CThis is a schematic diagram of the beam transmission state near the focal plane in AR mode, provided in an embodiment of this application. Figure 11D This is a schematic diagram of the beam transmission state at the far focal plane in AR mode, provided in an embodiment of this application. Figure 12A This is a schematic diagram of the beam transmission state at the far focal plane in VR state, provided in an embodiment of this application. Figure 12B This is a schematic diagram of the beam transmission state near the focal plane in VR state provided in an embodiment of this application; Figure 13A This is a schematic diagram of the beam transmission state at a small field of view, provided in an embodiment of this application. Figure 13B A schematic diagram of beam transmission state at a large field of view provided in an embodiment of this application; Figure 14 This is a schematic flowchart of a control method provided in an embodiment of this application; Figure 15 This is a schematic diagram of another control method provided in an embodiment of this application; Figure 16 This is a schematic diagram of another control method provided in an embodiment of this application; Figure 17 This is a schematic diagram of another control method provided in an embodiment of this application; Figure 18 This is a schematic diagram of another control method provided in an embodiment of this application; Figure 19 This is a schematic flowchart of another control method provided in an embodiment of this application. Detailed Implementation

[0039] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0040] The following provides explanations for some of the terms used in this application. It should be noted that these explanations are for the convenience of those skilled in the art and do not constitute a limitation on the scope of protection claimed in this application.

[0041] (1) Near-eye display: Displaying images close to the eyes is a display method used in AR or VR display devices.

[0042] (2) Focal power: Optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of an optical system to deflect rays. Optical power is commonly represented by the letter […]. Indicates the optical power of the refracting spherical surface. =(n'-n) / r=n' / p'=-n / q, where n' is the image-side refractive index, n is the object-side refractive index, r is the radius of the sphere, p is the image distance, and q is the object distance. Optical power is generally expressed as the reciprocal of the image-side focal length (approximately assuming the refractive index of air is 1). The unit of optical power is diopter (D), 1 diopter (D) = 1 m. -1 .

[0043] (3) 1 / 4 wave plate: A quarter-wave plate is a birefringent optical device comprising two fast-axis optical axes, a fast axis and a slow axis. It can be used to cause linearly polarized light along the fast and slow axes to pass through the quarter-wave plate and generate... A phase difference of 2 / 2.

[0044] (4) Polarizing lens: A polarizing lens is a transparent material, typically glass or plastic, whose optical power in an optical system depends on the polarization state of the input light. For example, a left-handed circularly polarized beam will exhibit positive optical power, while a right-handed circularly polarized beam will exhibit negative or zero optical power. Common polarizing lenses include geometric phase lenses, liquid crystal lenses, and geometric phase superlenses.

[0045] (5) Polarization rotator. A polarization rotator is a device used to convert the polarization state of polarized light.

[0046] (6) Stray polarized light: In an optical system, for an imaging optical system, any unwanted light that reaches the detector surface or human eye after propagation is stray polarized light; for a non-imaging optical system, any spot formed by imaging or other unintended light propagation is stray polarized light. For example, stray polarized light may include ghost polarized light.

[0047] This application applies to wearable devices. Wearable devices can be near-eye display (NED) devices, such as VR glasses or VR headsets. For example, users wear NED devices to play games, read, watch movies (or TV series), participate in virtual meetings, participate in video education, or engage in video shopping.

[0048] To eliminate stray polarized light appearing in images displayed by near-eye display devices, the near-eye display device described in this application can switch between multiple states, such as switching between different imaging focal planes, different fields of view (FOV), or switching between AR and VR states. To further eliminate stray polarized light, this application provides an optical imaging system that ensures the target polarized light and stray polarized light have different polarization directions in different states, thereby filtering out stray polarized light based on its polarization direction.

[0049] The optical imaging system provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0050] See Figure 1 The diagram shown is a structural schematic of an optical imaging system provided in an embodiment of this application. 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. See also... Figure 1 As shown, the optical imaging system also includes a control component 200. The optical component 100 includes a state adjustment component 110 and a stray polarization elimination component 120. Under the control of the control component 200, the state adjustment component 110 adjusts the beam state of the input polarized light to obtain the target polarized light. Beam state adjustment can be, for example, divergence processing or convergence processing. When the state adjustment component 110 outputs the target polarized light after adjusting the beam state of the input polarized light, stray polarized light is still generated. Research has shown that the polarization directions of the target polarized light output by the state adjustment component 110 and the output stray polarized light are orthogonal. After receiving the target polarized light and the stray polarized light, the stray polarization elimination component 120, under the control of the control component 200, adjusts the polarization direction of the stray polarized light to eliminate the stray polarized light and output the target polarized light. As an example, the stray polarization elimination component 120 has the function of adjusting the polarization direction of polarized light and transmitting polarized light with a fixed polarization direction. Based on this, the stray polarization light elimination component 120 adjusts the polarization direction of the stray polarization light under the control of the control component 200, so that the polarization direction of the stray polarization light is orthogonal to the fixed polarization direction, that is, the stray polarization light elimination component 120 can eliminate the stray polarization light and output the target polarization light.

[0051] It should be noted that the elimination of stray polarized light mentioned in the embodiments of this application can be understood as the degree of elimination of stray polarized light reaching a level that is imperceptible to the human eye.

[0052] It should be understood that while adjusting the polarization direction of the stray polarized light, the stray polarization light elimination component 120 also adjusts the polarization direction of the target polarized light input to the component, maintaining the orthogonality between the stray polarized light and the target polarized light. Since the stray polarized light is orthogonal to the fixed polarization direction transmitted by the component after adjustment, while the target polarized light is parallel to the fixed polarization direction transmitted by the component, the stray polarized light is blocked, and the target polarized light is output.

[0053] In some embodiments, the control component 200 can also control the optical component 100 to be in a non-operating state. When the optical component 100 is in a non-operating state, the optical component 100 can eliminate the target polarized light under the control of the control component 200.

[0054] The following is about Figure 1 Each functional component and structure is described in detail to provide an exemplary implementation scheme.

[0055] The possible structure of the stray polarization elimination component 120 is described below. See also... Figure 2 As shown, the stray polarization elimination component 120 may include a first polarization converter 1201 and a first polarizer 1202.

[0056] The first polarization converter 1201 is used to maintain the polarization direction of the target polarized light and stray polarized light output by the transmission light component 102, or to convert the polarization direction of the target polarized light and stray polarized light output by the transmission light component 102.

[0057] The first polarization converter 1201 can be an electronically controlled polarization switch (ECPS). For example, the ECPS can be any one of nematic liquid crystals, vertical alignment (VA) liquid crystals, in-plane switching (IPS) liquid crystals, electronically twisted nematic (TN) liquid crystals, electronically controlled nonlinear crystals, or electronically controlled ferroelectric liquid crystals.

[0058] In one possible example, the control component 200 controls the first polarization converter 1201 to be unpowered, in order to maintain the polarization direction of the input polarized light. This can be understood as the input polarized light and the output polarized light having the same polarization direction, or as the first polarization converter 1201 only transmitting the input polarized light. It should be noted that when a light beam is transmitted through an optical component, there may be energy loss, but the information carried by the beam remains unchanged. Based on this, this embodiment considers the input polarized light and the output polarized light, which only undergo transmission processing, to be the same polarized light. In another possible example, the control component 200 controls the first polarization converter 1201 to be powered on, in order to convert the polarization direction of the input polarized light, such as converting the input polarized light from the X direction to the Y direction, or converting the input polarized light from the Y direction to the X direction.

[0059] Taking a twisted nematic (TN) liquid crystal cell as an example, a TN liquid crystal cell consists of two conductive substrates with a liquid crystal layer sandwiched between them. When the TN liquid crystal cell is not powered, the polarization direction of the incident polarized light passing through the TN liquid crystal cell rotates by 90 degrees; when the TN liquid crystal cell is powered, the TN liquid crystal cell stands upright, and the polarization direction of the incident polarized light passing through the TN liquid crystal cell remains unchanged, still emitting polarized light with the same polarization state as the incident polarized light.

[0060] The first polarizer 1202 only transmits polarized light with a fixed polarization direction. The target polarized light input to the first polarizer 1202 has a fixed polarization direction. Since the polarization direction of the target polarized light is orthogonal to the polarization direction of the stray polarized light, the first polarizer can filter out the stray polarized light and output the target polarized light.

[0061] A polarizer is an optical element that can convert natural light into polarized light. Polarizers can be divided into natural polarizers and artificial polarizers. Natural polarizers are made of crystal. Artificial polarizers are composite materials laminated together from a polarizing film, an inner protective film, a pressure-sensitive adhesive layer, and an outer protective film. Based on the base color, polarizers can be divided into black-and-white polarizers and colored polarizers. Based on their application, polarizers can be classified into three types: transmission-type, transmission-reflection-type, and anti-transmission-type. For example, an absorptive polarizer has the function of both blocking and transmitting incident light. For example, it can allow longitudinal light to pass through while blocking transverse light; or it can allow transverse light to pass through while blocking longitudinal light. In the embodiments of this application, the first polarizer 1202 can be a linear polarizer. For example, it can be a metal wire grid type, a multilayer birefringent polymer film type, or a MacNeille type, etc. The polarized light transmitted by a linear polarizer refers to linearly polarized light. Linearly polarized light can be P-light or S-light. It is understood that unpolarized light includes both P-light and S-light. P-rays are light rays whose polarization direction is parallel to a certain reference plane, which is related to the structure of the polarizer. S-rays are light rays whose polarization direction is orthogonal to the reference plane. Typically, linear polarizers transmit P-rays and block S-rays.

[0062] The phenomenon where the spatial distribution of the electric vector vibration of a light wave loses symmetry with respect to the direction of light propagation is called the polarization of light. It is the most obvious characteristic distinguishing transverse waves from other longitudinal waves. Only transverse waves can produce polarization; therefore, the polarization of light is another example of the wave nature of light. Light that contains transverse vibrations in all possible directions within a plane orthogonal to the direction of propagation, and which, on average, has the same amplitude in any direction, is called unpolarized light (natural light). Light whose vibrations lose this symmetry is collectively called polarized light. Polarized light can include linearly polarized light, partially polarized light, and circularly polarized light. Looking towards the direction of the light ray, light whose electric vector rotates clockwise is called right-handed circularly polarized light, and light whose electric vector rotates counterclockwise is called left-handed circularly polarized light.

[0063] Taking the first polarizer 1202 as an example, which transmits polarized light with a fixed polarization direction, specifically the Y direction, the control component 200 can adjust the polarization directions of the target polarized light and stray polarized light output from the first polarization converter 1201. This ensures that the polarization direction of the target polarized light input to the first polarizer 1202 is the Y direction, and the polarization direction of the stray polarized light input to the first polarizer 1202 is the X direction. After passing through the first polarizer 1202, the stray polarized light in the X direction is eliminated, and the target polarized light in the Y direction is output.

[0064] The possible structure of the state adjustment component 110 is described below.

[0065] See Figure 3 As shown, the state adjustment assembly 110 includes a second polarization converter 101 and a transmission light assembly 102. The structure of the optical assembly 100 can be found in [reference needed]. Figure 4 As shown.

[0066] The second polarization converter 101 is used to maintain or change the polarization direction of the input polarized light. The transmission light component 102 is used to diverge or converge the input polarized light. It should be noted that the transmission light component 102 has optical power, supporting both positive and negative optical power. At positive optical power, the input polarized light can be converged; conversely, at negative optical power, the input polarized light can be diverged.

[0067] In some embodiments, the second polarization converter 101 maintains the polarization direction of the input polarized light when not powered on. When powered on, the second polarization converter changes the polarization direction of the input polarized light; for example, if the polarization direction of the input polarized light is X-direction, then the polarization direction of the output polarized light is Y-direction.

[0068] In some embodiments, the transmission light component 102 can adjust the different beam states of the input polarized light when inputting polarized light with different polarization directions.

[0069] In one possible example, when a first polarization direction is input, the transmission light component 102 converges the input polarized light; when a second polarization direction is input, the transmission light component 102 diverges the input polarized light. Therefore, in some scenarios where the optical component 100 needs to perform convergence processing, the control component 200 can control the second polarization converter 101 to output polarized light in the first polarization direction. In other scenarios where the optical component needs to perform divergence processing, the control component 200 can control the second polarization converter 101 to output polarized light in the second polarization direction.

[0070] When the polarized light output from the second polarization converter 101 propagates in the transmission light assembly 102, stray polarized light is generated. When the lens light assembly 102 adjusts the beam state of the polarized light output from the second polarization converter 101 to output the target polarized light, stray polarized light is also generated.

[0071] The second polarization converter 101 can be an electronically controlled polarization switch (ECPS). For example, the ECPS can be any one of nematic liquid crystals, vertical alignment (VA) liquid crystals, in-plane switching (IPS) liquid crystals, electronically twisted nematic (TN) liquid crystals, electronically controlled nonlinear crystals, or electronically controlled ferroelectric liquid crystals.

[0072] In one possible example, the control component 200 controls the second polarization converter 101 to be unpowered, in order to maintain the polarization direction of the input polarized light. This can be understood as the input polarized light and the output polarized light having the same polarization direction, or as the second polarization converter 101 only transmitting the input polarized light. It should be noted that when a light beam is transmitted through a certain optical component, there may be energy loss, but the information carried by the beam does not change. Based on this, this embodiment considers the input polarized light and the output polarized light, which only undergo transmission processing, to be the same polarized light. In another possible example, the control component 200 controls the second polarization converter 101 to be powered on, in order to convert the polarization direction of the input polarized light, such as converting the input polarized light from the X direction to the Y direction, or vice versa. By controlling the second polarization converter 101 to be powered on or off, the control component 200 makes the polarized light output by the transmission light component 102 have positive or negative optical power, which can realize the switching of the focal plane of imaging or the switching of the field of view, etc.

[0073] Taking a twisted nematic (TN) liquid crystal cell as an example, a TN liquid crystal cell consists of two conductive substrates with a liquid crystal layer sandwiched between them. When the TN liquid crystal cell is not powered, the polarization direction of the incident polarized light passing through the TN liquid crystal cell rotates by 90 degrees; when the TN liquid crystal cell is powered, the TN liquid crystal cell stands upright, and the polarization direction of the incident polarized light passing through the TN liquid crystal cell remains unchanged, still emitting polarized light with the same polarization state as the incident polarized light.

[0074] The possible structures of the transmission light assembly 102 are described below. The transmission light assembly 102 in this embodiment has optical power. Different polarization directions of the input polarized light achieve different positive and negative optical powers.

[0075] The structures of two possible transmission light components 102 are described below as examples.

[0076] Example 1: The transmitted light component 102 is a linear polarization-dependent lens. This type of lens focuses linearly polarized light in a single polarization direction and diverges linearly polarized light in orthogonal directions, or does not change its optical power. In some embodiments, the focusing or diverging of light can be achieved by adjusting the polarization direction of the input polarized light to the linear polarization-dependent lens, thereby achieving different positive and negative optical powers, i.e., displaying different field of view angles as needed. For example, the linear polarization-dependent lens can be a birefringent liquid crystal lens.

[0077] Example 2, see Figure 5A As shown. The transmission light assembly 102 includes a first quarter-wave plate 1021, a polarizing lens 1022, and a second quarter-wave plate 1023.

[0078] A quarter-wave plate, also known as a 45-degree phase retardation plate, is made of a birefringent material. When the light vector of linearly polarized light forms a ±45° angle with the fast or slow axis of the quarter-wave plate, the light passing through the plate is circularly polarized; conversely, circularly polarized light becomes linearly polarized after passing through the plate. For example, a quarter-wave plate can convert linearly polarized light in the X-direction to left-handed circularly polarized light and linearly polarized light in the Y-direction to right-handed circularly polarized light. Conversely, it converts left-handed circularly polarized light to X-direction linearly polarized light and right-handed circularly polarized light to Y-direction linearly polarized light. Alternatively, it can convert linearly polarized light in the X-direction to right-handed circularly polarized light and linearly polarized light in the Y-direction to left-handed circularly polarized light. Conversely, it converts left-handed circularly polarized light to Y-direction linearly polarized light and right-handed circularly polarized light to X-direction linearly polarized light. When the fast axis directions of the first quarter-wave plate 1021 and the second quarter-wave plate 1023 are the same, their linear-to-circular polarization directions are the same. For example, both the first quarter-wave plate 1021 and the second quarter-wave plate 1023 convert linearly polarized light in the X-direction into right-handed circularly polarized light. If the fast axis directions of the first quarter-wave plate 1021 and the second quarter-wave plate 1023 are orthogonal, their linear-to-circular polarization directions are opposite. For example, if the first quarter-wave plate 1021 converts linearly polarized light in the X-direction into right-handed circularly polarized light, then the second quarter-wave plate 1023 converts linearly polarized light in the X-direction into left-handed circularly polarized light.

[0079] The polarizing lens 1022 can also be called a polarization dependent lens (PDL) 1022. Polarization dependent lenses can be liquid crystal lenses, liquid crystal geometric phase lenses, metasurface polarizing lenses, or metasurface geometric phase lenses, etc.

[0080] Polarization-dependent phase-distribution (PDD) beams, similar to those of spatial lenses, shape the wavefront of the outgoing beam, thereby modifying the propagation direction of the incident beam. Typically, PDL is used to handle circularly polarized incident beams. Specifically, whether a parallel incident beam converges or diverges depends on the directionality of the incident circularly polarized beam. For example, PDL converges left-handed circularly polarized light and diverges right-handed circularly polarized light, or vice versa.

[0081] For example, see Figure 5BAs shown, the beam output from the second polarization converter 101 has an X-direction polarization, referred to as polarized light 1. After passing through the first quarter-wave plate 1021, it is converted into right-hand circularly polarized light 1. Right-hand circularly polarized light 1 enters the PDL 1022. Taking the convergence effect of the PDL 1022 on the right-hand circularly polarized light as an example, after processing by the PDL 1022, left-hand circularly polarized light 2 is output. Since the efficiency of the PDL 1022 has limitations, for example, within the range of RGB three colors and a ±45° field of view, the maximum efficiency is generally only 90%+. ECPS is generally implemented using a liquid crystal cell. Taking a TN liquid crystal cell as an example, under power-on conditions, the efficiency is poor in the 45°, 135°, 225°, and 315° directions. Therefore, after processing by the second polarization converter 101 and the PDL, polarized light 1 will generate stray polarized light. Generally, when right-handed circularly polarized light 1 is processed by a PDL 1022 to obtain left-handed circularly polarized light 2, stray polarized light may be generated. Research has shown that when the efficiency of the PDL and polarization converter is insufficient, a multi-state optical imaging system based on the PDL will introduce a ghost image from another state when switching to a certain state. This ghost image from the other state is orthogonal to the polarization direction of the target light in the current state. If the light is circularly polarized, the rotation direction of the stray polarized light is opposite to that of the target light (i.e., right-handed circularly polarized light 2).

[0082] Further, see Figure 5B As shown, taking the parallel fast-axis optical axis directions of the second quarter-wave plate 1023 and the first quarter-wave plate 1021 as an example, the second quarter-wave plate 1023 is used to convert circularly polarized light into linearly polarized light. Therefore, after the left-handed circularly polarized light 2 is processed by the second quarter-wave plate 1023, it is converted into polarized light 2, and the polarization direction of polarized light 2 is the Y direction. Right-handed stray polarized light is converted into linearly polarized stray polarized light. The polarization directions of polarized light 2 and linearly polarized stray polarized light are orthogonal, and the polarization direction of linearly polarized stray polarized light is the X direction.

[0083] Furthermore, if the fast axis optical axis of the second quarter-wave plate 1023 is orthogonal to that of the first quarter-wave plate 1021, the second quarter-wave plate 1023 is used to convert circularly polarized light into linearly polarized light. Therefore, after being processed by the second quarter-wave plate 1023, the left-handed circularly polarized light 2 is converted into linearly polarized light 2, with the polarization direction of the linearly polarized light 2 being the X direction. Right-handed stray polarized light is converted into linearly polarized stray polarized light. The polarization direction of the linearly polarized light 2 is orthogonal to that of the linearly polarized stray polarized light, with the polarization direction of the linearly polarized stray polarized light being the Y direction.

[0084] Combination Figure 6A The structure shown, then Figure 5B For examples, see Figure 6BAs shown, taking the transmission direction of the first polarizer 1202 as the Y direction and blocking 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 transmission light component 102. 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.

[0085] As another example, in some embodiments, the polarization direction of the target polarized light output by the state adjustment component 110 is the X direction, while the polarization direction of the stray polarized light is the Y direction. Since the transmission direction of the first polarizer 1202 is the Y direction, it blocks the polarized light in the X direction. Therefore, the control component 200 can control the first polarization converter 1201 to convert the polarization direction of the received polarized light, changing the polarization direction of the target polarized light from the X direction to the Y direction, and changing the polarization direction of the stray polarized light from the Y direction to the X direction. Thus, after passing through the first polarizer 1202, the stray polarized light is filtered out, and the target linearly polarized light is transmitted.

[0086] Through the above design, the optical power of the optical component is switched by adjusting the polarization direction of the polarized light output by the second polarization converter 101. The polarization directions of the output polarized light and stray polarized light are adjusted by combining the first polarization converter 1201 with the second polarization converter 101, so that the polarization direction of the stray polarized light is orthogonal to the transmission direction of the first polarizer 1202, causing the stray polarized light to be absorbed by the first polarizer 1202 and thus eliminating the stray polarized light.

[0087] For example, the beam transmission of the optical components provided in the embodiments of this application is described below using Tables 1 and 2. Table 1 uses X-direction polarized light as an example, and Table 2 uses Y-direction polarized light as an example. It should be noted that Tables 1 and 2 are only examples. For example, taking Table 1 as an example, if X-direction polarized light is input, and the second polarization converter can maintain the polarization direction of the input polarized light, the polarization direction of the target polarized light output after the input polarized light passes through the second polarization converter is X-direction. The transmission light component has positive optical power when X-direction polarized light is input and outputs X-direction polarized light; and has negative optical power when Y-direction polarized light is input and outputs Y-direction polarized light. Then, after the target polarized light in the X direction is transmitted through the transmission light component, the output target polarized light has negative optical power, that is, the input polarized light is diverged. After transmission through the transmission light component, the polarization direction of the output target polarized light is X-direction, and stray Y-direction polarized light is generated. Based on this, the second polarization converter can be adjusted by 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 filter out the stray polarized light in the Y direction.

[0088] Table 1

[0089] Table 2

[0090] In one possible implementation, the control component 200 may be a processor, microprocessor, controller, or other control component, such as a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof.

[0091] In one possible implementation, the functions executed by the control component can be found in the aforementioned descriptions, which will not be repeated here.

[0092] In some embodiments of this application, the optical imaging system may further include a display component 300. The display component 300 serves as an image source, providing display content to the optical imaging system, such as 3D content or interactive visuals. The display component may include a VR lens barrel, a VR refractive optical path, an AR waveguide / light guide, a Birdbath reflection imaging optical path, or other image source providing components. See also Figure 6C As shown, the display component 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 can be configured in the optical path of the VR lens barrel. As an example, if the optical path includes a front end, a middle end, or a rear end, then at least one optical component can be configured at the front end, the middle end, or the rear end. It should be noted that the end closer to the input beam is called the front end, and the end closer to the output end is called the rear end. In some examples, at least one optical component can be configured at any position in the optical path, and this application embodiment does not specifically limit this.

[0093] The solution provided in the embodiments of this application is described below in conjunction with specific state switching scenarios.

[0094] In one possible scenario, the optical states of the near-focal plane and the far-focal plane of an optical imaging system are switched. In the following description, the labels of the various components in the optical imaging system are not illustrated.

[0095] Example 1 illustrates how a second polarization converter (hereinafter referred to as ECPS1) and a first polarization converter (hereinafter referred to as ECPS2) are used to convert the polarization direction of the input polarized light when powered on. The second and first polarization converters are also used to maintain the polarization direction of the input polarized light when not powered on. For example, a transmission light component has negative optical power for the input Y-direction polarized light and outputs X-direction polarized light, and positive optical power for the input X-direction polarized light and outputs Y-direction polarized light. The transmission direction of the first polarizer (hereinafter referred to as polarizer 1) is the Y-direction.

[0096] The control component can determine whether to switch the imaging position to the near or far focal plane based on the scene of the displayed content, the user's eye gaze position (which can be determined by the eye camera), or user settings. For example, in VR applications, in some close-range scenarios such as office work, reading, and keyboard interaction, the user needs to switch to the near focal plane; in other far-range applications, such as meetings, watching movies, and non-interactive games like shooting games, the user needs to switch to the far focal plane to reduce discomfort caused by convergence-accommodation conflict. This application does not specifically limit this.

[0097] See Figure 7A As shown, the optical imaging system is switched to the near-focal plane. The near-focal plane has negative optical power. Taking input Y-direction polarized light as an example, the control component controls ECPS1 to be in an unpowered state, maintaining the polarization direction of the input polarized light, so that the transmission light component has negative optical power for the input Y-direction polarized light. The transmission light component outputs target polarized light in the X-direction while also outputting stray polarized light in the Y-direction. Since polarizer 1 transmits Y-direction polarized light, the control component controls ECPS2 to be in a powered state, thereby converting the input X-direction target polarized light into Y-direction target polarized light and the Y-direction stray polarized light into X-direction stray polarized light. The X-direction stray polarized light is absorbed by polarizer 1.

[0098] See Figure 7BAs shown, the transmission light assembly includes a first quarter-wave plate (represented by QWP1 below), a second quarter-wave plate (represented by QWP2 below), and a polarization-dependent lens (PDL). The fast-axis optical axes of QWP1 and QWP2 coincide, used to convert linearly polarized light in the Y direction into left-handed circularly polarized light, and vice versa. The polarization-dependent lens (PDL) has negative optical power when left-handed circularly polarized light is input, and positive optical power when right-handed circularly polarized light is input. The transmission direction of the first polarizer (represented by polarizer 1 below) is the Y direction. Specifically, the light conversion of each component is shown in Table 3.

[0099] Table 3

[0100] See Figure 7B As shown, the optical imaging system is switched to the near-focal plane. The near-focal plane has negative optical power, therefore the PDL needs to input right-hand circularly polarized light. Taking an example where the target beam input to the display screen is linearly polarized light with the polarization direction in the Y direction. See [link to documentation]. Figure 7B As shown, the control component keeps ECPS1 in an unpowered state, so that when linearly polarized light in the Y direction is input, it remains linearly polarized in the Y direction after transmission through ECPS1. Then, after passing through QWP1, the linearly polarized light in the Y direction is converted into left-handed circularly polarized light. This left-handed circularly polarized light then passes through PDL, resulting in negative optical power, and the output target beam is converted into right-handed circularly polarized light. After passing through PDL, stray polarized light is generated. This stray polarized light has the opposite polarization direction to the target beam, being left-handed stray polarized light. The right-handed target beam, after passing through QWP2, is converted into linearly polarized light in the X direction, while the left-handed stray polarized light, after passing through QWP2, is converted into stray polarized light in the Y direction. The control component keeps ECPS2 in a powered state. When powered on, ECPS2 converts the target beam in the X direction into the target beam in the Y direction, and the stray polarized light in the Y direction into stray polarized light in the X direction. Since the transmission direction of the first polarizer is the Y direction, stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.

[0101] See Figure 7CAs shown, the optical imaging system is switched to the far focal plane. The far focal plane has positive optical power. Taking input Y-direction polarized light as an example, the control component controls ECPS1 to be in an energized state, converting the polarization direction of the input polarized light, so that the transmission light component has positive optical power for the input X-direction polarized light. The transmission light component outputs target polarized light in the Y direction while also outputting stray polarized light in the X direction. Since polarizer 1 transmits Y-direction polarized light, the control component controls ECPS2 to be in an unenergized state, thereby ECPS2 maintaining the polarization direction of the input Y-direction target polarized light and the stray polarized light in the X direction. The stray polarized light in the X direction is absorbed by polarizer 1.

[0102] See Figure 7D As shown, taking a transmission light assembly including QWP1, QWP2, and a polarization-dependent lens (PDL) as an example, when the optical imaging system switches to the far focal plane, the PDL needs to have positive optical power, thus requiring right-hand circularly polarized light to be input into the PDL. Taking a target beam input to the display screen as linearly polarized light with the polarization direction in the Y direction as an example, see [link to documentation]. Figure 7D As shown, the control component keeps ECPS1 powered on, so that after receiving linearly polarized light in the Y direction, ECPS1 converts the target beam from Y-direction linearly polarized light to X-direction linearly polarized light after transmission through ECPS1. Then, after passing through QWP1, the X-direction linearly polarized light is converted to right-hand circularly polarized light. This right-hand circularly polarized light then passes through PDL, possessing positive optical power, and the output target beam is converted to left-hand circularly polarized light. After passing through PDL, stray polarized light is generated. The stray polarized light has the opposite polarization direction to the target beam, being right-hand circularly polarized light. The left-hand circularly polarized target beam, after passing through QWP2, is converted to Y-direction linearly polarized light, while the right-hand circularly polarized stray light, after passing through QWP2, is converted to X-direction stray polarized light. The control component keeps ECPS2 powered off. In the unpowered state, ECPS2 transmits the target beam in the Y direction and the stray polarized light in the X direction. Since the transmission direction of polarizer 1 is the Y direction, stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.

[0103] As can be seen from the above scheme, by controlling ECPS1 and ECPS2 to be in a powered-on or powered-off state, the switching between the near focal plane and the far focal plane can be achieved.

[0104] In some embodiments, when the fast axis optical axes of QWP1 and QWP2 are orthogonal, the switching between the near focal plane and the far focal plane is achieved by controlling ECPS1 and ECPS2 to be in a powered-on or unpowered state, and ECPS1 and ECPS2 to be in the same state. The specific switching behavior of each component is shown in Table 4.

[0105] Table 4

[0106] See Figure 8A As shown, the optical imaging system is switched to the near-focal plane. The far-focal plane has negative optical power, so the PDL needs to input right-hand circularly polarized light. Taking a target beam input to the display screen as linearly polarized light with the polarization direction in the Y direction as an example. See [link to relevant documentation]. Figure 8A As shown, the control component keeps ECPS1 in an unpowered state, so that when linearly polarized light in the Y direction is input, it remains linearly polarized in the Y direction after transmission through ECPS1. Then, after passing through QWP1, the linearly polarized light in the Y direction is converted into left-handed circularly polarized light. This left-handed circularly polarized light then passes through PDL, resulting in negative optical power, and the output target beam is converted into right-handed circularly polarized light. After passing through PDL, stray polarized light is generated. This stray polarized light has the opposite polarization direction to the target beam, being left-handed stray polarized light. The right-handed target beam, after passing through QWP2, is converted into linearly polarized light in the Y direction, while the left-handed stray polarized light, after passing through QWP2, is converted into stray polarized light in the X direction. The control component keeps ECPS2 in an unpowered state. In the unpowered state, ECPS2 transmits the target beam in the Y direction and the stray polarized light in the X direction. Since the transmission direction of 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.

[0107] See Figure 8B As shown, taking the switching of the optical imaging system to the far focal plane as an example. The far focal plane has positive optical power, therefore the PDL needs to input left-handed circularly polarized light. Taking the target beam input to the display screen as linearly polarized light with the polarization direction in the Y direction as an example. See [link to relevant documentation]. Figure 8B As shown, the control component keeps ECPS1 powered on, so that when linearly polarized light in the Y direction is input, the target beam is converted from linearly polarized light in the Y direction to linearly polarized light in the X direction after transmission through ECPS1. Then, after passing through QWP1, the linearly polarized light in the X direction is converted into right-hand circularly polarized light. This right-hand circularly polarized light then passes through PDL, possessing positive optical power, and the output target beam is converted into left-hand circularly polarized light. After passing through PDL, stray polarized light is generated. The stray polarized light has the opposite polarization direction to the target beam, being right-hand circularly polarized light. The left-hand circularly polarized target beam, after passing through QWP2, is converted into linearly polarized light in the X direction, while the right-hand circularly polarized stray light, after passing through QWP2, is converted into stray polarized light in the Y direction. The control component keeps ECPS2 powered on. When powered on, ECPS2 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 polarizer 1 is the Y direction, stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.

[0108] pass Figure 8A and Figure 8B As shown, when the fast axis optical axes of QWP1 and QWP2 are orthogonal, the switching between the near focal plane and the far focal plane can be achieved by controlling ECPS1 and ECPS2 to be in a powered-on or powered-off state, and ECPS1 and ECPS2 to be in the same state.

[0109] For example, combined Figure 7A and 7C The elimination of stray polarized light intensity is explained. For example, the efficiencies of PDL and ECPS are respectively... and To indicate, according to Figure 7A and 7C The intensity of each ray in the structure shown in the diagram is shown in Table 5 below.

[0110] Table 5

[0111] As can be seen from Table 5, due to and The value is close to 1, and the polarization direction (X direction) of several stray polarized lights with higher intensity is the same as that of the target beam. Stray polarized light with polarization directions opposite to the Y-direction will be absorbed and filtered out by the polarizer. The intensities of high-intensity stray polarized light include: , and .

[0112] Figure 7A and Figure 7C If the optical assembly shown lacks a stray polarization elimination component, two ghost images (the -1st and 0th orders of the PDL) will be generated, with ghost image intensities of: .

[0113] in, Indicates the strength of a 0th-order ghost statue. This indicates the strength of a level 1 ghost.

[0114] According to Figure 7A and Figure 7C After processing by the stray polarization elimination component as shown, the ghost image intensity is: .

[0115] If we take the worst-case scenario with a large angle... , Without using the solution of this application, the maximum ghost image intensity is 5%, and the total ghost image intensity is 7%. However, with the solution of this application, the maximum ghost image intensity is only 0.2%, and the total ghost image intensity is only 0.24%. This proves that the solution provided by this application can eliminate stray polarized light in optical imaging systems.

[0116] In another possible scenario, the optical imaging system can be realized by serially coupling the N optical components provided in the embodiments of this application. The switching of individual optical focal planes. For example, different optical components can have PDLs with different optical focal planes, which can achieve... The control component controls the switching of the optical focal planes. It adjusts the polarization direction of the polarized light output from each of the N optical components by adjusting the polarization direction of the output polarized light from each second polarization converter, thereby controlling whether each transmitted light component has positive or negative optical power, so that the optical imaging system can image from at most [number missing] focal planes. Switching between different optical focal planes. Alternatively, the control component controls the ECPS of different optical components to be either powered on or off, thereby controlling the PDL in each optical component to have either positive or negative optical power, thus achieving the switching of the optical focal plane of the optical imaging system between the two optical planes. Switching between different focal planes.

[0117] Let's continue using the conversion relationships of the various components in the optical assembly described in Table 3 as an example. Taking the transmission light assembly, which includes QWP1, QWP2, and PDL, as an example. See [link / reference needed]. Figure 9 As shown, taking the series coupling of two optical components as an example, it is possible to switch between four optical focal planes and eliminate stray polarized light generated in each optical component. For ease of distinction, 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 component 2 includes ECPS3, QWP3, PDL2, QWP4, ECPS4, and polarizer 2.

[0118] pass Figure 9 As shown, the control component controls the ON or OFF state of the four ECPS, or in other words, controls the power-on or power-off state of the four ECPS. Power-on can be understood as being on, and power-off can be understood as being off.

[0119] Through the above design, by adjusting the on / off state of the four ECPS in the two optical components of the optical imaging system, ghosting can be effectively eliminated while achieving four optical focal planes. For example, Figure 9As shown, using GPLs with optical power of 1 and 2, this optical imaging system can achieve four optical powers: -3, -1, 1, and 3, thereby enabling the switching of four focal planes in near-eye devices. In some embodiments, the solution provided in this application can be used for displaying various 3D scenes. For example, generally, a range of focal planes with a maximum distance of 3 meters and a minimum distance of 30 centimeters is selected, and four focal planes are divided with equal optical power. Then, the spacing between the eight focal planes can be (0.3, 0.4, 0.62, 1.31, 3) meters.

[0120] In some possible implementations, stray polarized light generated by multiple state adjustment components is eliminated by a single stray polarization elimination component. For example, stray polarized light generated by two state adjustment components can be eliminated by a single stray polarization elimination component. See, for example, [link to relevant documentation]. Figure 10 As shown, this example illustrates how a stray polarization elimination component can eliminate stray polarized light generated by two state adjustment components. It can be understood that... Figure 10 The proposed solution can save one stray polarization elimination component. However, its ability to eliminate ghost images is reduced compared to using two stray polarization elimination components. Nevertheless, it can eliminate the main ghost images to a degree that is generally imperceptible to the human eye.

[0121] In another possible scenario, embodiments of this application can realize the switching between AR and VR modes of the optical imaging system. For example, in certain scenarios, such as outdoors, in complex environments, and when interacting with real people and objects, users need to switch to AR mode, while in other scenarios, such as immersive games and watching movies, users prefer VR mode. Therefore, switchable AR and VR modes better meet user needs. In some embodiments, by controlling the switching of the polarization converter's energized or de-energized state using control components, not only can the switching between AR and VR modes be realized, but also the switching between different focal planes in AR mode imaging, or the switching between different focal planes in VR mode imaging. The optical imaging system includes the two optical components described above. For ease of distinction, the two optical components are referred to as the first optical component and the second optical component, respectively. The optical imaging system also includes a second polarizer, which is coupled to the first optical component, and the first optical component and the second optical component are coupled through an optical waveguide. See Figure 11A As shown, the optical imaging system also includes a projection component for inputting polarized light from the image into a second optical component via an optical waveguide.

[0122] A projection component is used to provide an image source in AR or VR mode. A second polarizer is used to convert the input natural light into polarized light, which is then input to the first optical component.

[0123] The control component is specifically used to: put the optical imaging system into AR mode by controlling the first optical component to be in an active state and controlling the second optical component to be in an active state; or to put the optical imaging system into VR mode by controlling the first optical component to be in a non-active state and controlling the second optical component to be in an active state. When the first optical component is in a non-operating state, it outputs the second polarized light generated by the first state adjustment component in the first optical component; when the first optical component is in an operating state, the first stray light elimination component in the first optical 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 an operating state, the second stray polarized light elimination component in the second optical component eliminates the stray polarized light generated by the first state adjustment component in the second optical component.

[0124] In some embodiments, each optical component includes two polarization converters. A control component can control the optical component to be in an active or inactive state by controlling the polarization state of the two polarization converters on the input polarized light.

[0125] In VR mode, natural light passes through a second polarizer and outputs first polarized light. The control component can control a first state adjustment component to output a first target polarized light (also called target natural light) when the first polarized light (natural light processed by the second polarizer becomes naturally polarized light) is input. It can also control a first stray polarization elimination component to adjust the polarization direction of the first target polarized light, thus eliminating it and preventing it from entering the second optical component via the optical waveguide. In other words, natural light will not enter the second optical component. The control component also controls a second state adjustment component to output both the second target polarized light and the first stray polarized light when the second polarized light is input. The second state adjustment component also generates the first stray polarized light when outputting the second target polarized light; the polarization directions of the first stray polarized light and the second target polarized light are orthogonal. Finally, the control component controls a second stray polarization elimination component to adjust the polarization direction of the first stray polarized light, eliminating it and outputting the second target polarized light.

[0126] In AR mode, natural light passes through a second polarizer and outputs first polarized light. The first state adjustment component is controlled to output a third target polarized light (i.e., target natural light) and a second stray polarized light when the first polarized light is input; the polarization directions of the second stray polarized light and the third target polarized light are orthogonal. The first stray polarization elimination component is controlled to adjust the polarization direction of the second stray polarized light so that it eliminates the second stray polarized light and outputs the third target polarized light through a light waveguide second optical component. The second state adjustment component is controlled to output a fourth target polarized light and the 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 (i.e., target image light, polarized light carrying image information); the polarization directions of the third stray polarized light and the fourth target polarized light are orthogonal. The second stray polarization elimination component is controlled to adjust the polarization direction of the third stray polarized light so that it eliminates the third stray polarized light and outputs the fourth target polarized light.

[0127] As an example, both the first optical component and the second optical component adopt... Figure 4 The structure shown is an example. For example, see... Figure 11B The structure of the optical imaging system is shown. For example, referring to Table 2, polarizers 1-3 are all used to transmit polarized light in the Y direction. In AR mode, the polarized light carrying image information, referred to as image light, is input to ECPS3 through an optical waveguide. Taking imaging at the near-focal plane as an example, the transmission light component has positive optical power when inputting polarized light in the Y direction and outputs polarized light in the X direction; it has negative optical power when inputting polarized light in the X direction and outputs polarized light in the Y direction. When imaging at the near-focal plane, the transmission light component 2 needs to have negative optical power, thus requiring the input of polarized light in the X direction. The polarized light input to ECPS3 through the optical waveguide is in the Y direction. The control component controls ECPS3 to convert the input target image light in the Y direction to the X direction. After the target image light in the X direction is input to the transmission light component 2, the transmission light component performs divergence processing on the target image light, outputting the target image light in the Y direction and stray polarized light in the X direction. The control component controls ECPS4 to keep the polarization directions 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 out by polarizer 2.

[0128] After passing through polarizer 3, the natural light outputs target natural polarized light in the Y direction, referred to as target natural light. Since the target natural light does not require optical power, it does not require divergence or convergence processing. Because the second optical component needs to have negative optical power, the control component can control the first optical component to have positive optical power, so that the target natural light, after passing through the first and second optical components, has zero optical power. Specifically, the target natural light in the Y direction is input to ECPS1. The control component controls ECPS1 to maintain the polarization direction of the input target natural light in the Y direction. After the target natural light in the Y direction is input to the transmission light component 1, the transmission light component converges the target natural light, outputting target natural light in the X direction and stray polarized light in the Y direction. The control component controls ECPS2 to convert the target natural light in the X direction to target natural light in the Y direction, and to 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 out by polarizer 1. Thus, the target natural light in the Y direction is input to the second optical component. It should be noted that the target natural light and target image light in the Y direction are fused and then input to the second optical component. To clearly describe the transmission of the target natural light and target image light through the second optical component, this embodiment describes the transmission of the target natural light and target image light through the second optical component separately. The target natural light is input to ECPS3 through an optical waveguide. ECPS3 converts the input target natural light in the Y direction to the X direction. The target natural light in the X direction is then input to the transmission light component 2, which performs divergence processing on the target natural light, outputting the target natural light in the Y direction and stray polarized light in the X direction. The control component controls ECPS4 to maintain the polarization directions of the target natural light in the Y direction and the stray polarized light in the X direction unchanged, thus the stray polarized light in the X direction is filtered out by polarizer 2. Through the solution provided in this embodiment, in AR mode, both switching of the AR optical focal plane and elimination of stray polarized light can be achieved. This prevents ghost light from affecting the imaging.

[0129] In VR mode, it's necessary to prevent natural light from entering the human eye. This can be achieved by blocking natural light with a first optical component and outputting the target image light through a second optical component, allowing it to enter the human eye. The transmission state of the polarized light carrying image information in the second optical component is similar to that in AR mode, and will not be elaborated here. After passing through polarizer 3, the natural light outputs target natural polarized light in the Y direction, referred to as target natural light. To prevent natural light from passing through polarizer 1, the direction of the target polarized light input to polarizer 1 can be adjusted to the X direction. For example, if the target natural light in the Y direction is input to ECPS1, the control component controls ECPS1 to maintain the polarization direction of the input target natural light in the Y direction. Thus, after the target natural light in the Y direction is input to the transmission light component 1, the target natural light in the X direction is output. The control component controls ECPS2 to maintain the polarization direction of the target natural light in the X direction, thereby filtering out the target polarized light in the X direction by polarizer 1.

[0130] As an example, the structure of the first optical component and the second optical component adopts... Figure 6A Taking the structure shown as an example, the structure of the optical imaging system can be found in [reference needed]. Figure 11B As shown below. Figure 11C and Figure 11D A schematic diagram illustrating the switching between AR and VR modes for an optical imaging system.

[0131] Taking the two ECPSs in the first optical component as ECPS1 and ECPS2, and the two QWPs in the first optical component as QWP1 and QWP2, and the PDL in the first optical component as PDL1, the two ECPSs in the second optical component are referred to as ECPS3 and ECPS4. The first optical component includes a polarizer 1. The two QWPs in the second optical component are referred to as QWP3 and QWP4, and the PDL in the second optical component is referred to as PDL2, the two optical components in the second optical component are referred to as PDL2, the two optical components in the second optical component are referred to as polarizer 2. The optical imaging system also includes a second polarizer, which will be referred to as polarizer 3 in subsequent embodiments.

[0132] The following uses the light conversion relationships of the various components described in Table 6 as an example to describe how the control component controls the optical imaging system to be in AR state.

[0133] Table 6

[0134] The following describes how an optical imaging system, under the control of a control component, is placed in an AR (Area of ​​Focus) state. In some embodiments, the control component in the AR state can control the optical imaging system to image onto either the near-focal plane or the far-focal plane. See also... Figure 11C As shown, the optical imaging system is described in AR state imaging at the far focal plane.

[0135] First, the AR projection component inputs the target display light into the second optical component. It should be noted that the target display light is polarized light. Since the focal plane requires the PDL to have positive optical power, PDL2 needs to input right-hand circularly polarized light. Taking an example where the target display light input into the projection component is linearly polarized light with the polarization direction in the Y direction, see [link to example]. Figure 11C As shown in (a), the control component controls ECPS3 to be in a powered-on state. When linearly polarized light in the Y direction is input, ECPS3 transmits the target display light, converting it from Y-direction linearly polarized light to X-direction linearly polarized light. Then, after passing through QWP3, the X-direction linearly polarized light is converted to right-hand circularly polarized light. This right-hand circularly polarized light then passes through PDL2, possessing positive optical power, and the output target display light is converted to left-hand circularly polarized light. After passing through PDL2, stray polarized light is generated. This stray polarized light has the opposite polarization direction to the target display light, being right-hand circularly polarized. The left-hand circularly polarized target display light, after passing through QWP4, is converted to Y-direction linearly polarized light, while the right-hand circularly polarized stray light, after passing through QWP4, is converted to X-direction stray polarized light. The control component controls ECPS2 to be in a powered-off state. In the powered-off state, ECPS4 maintains the polarization direction of the target display light in the Y direction and the polarization direction of the stray polarized light in the X direction. Since the transmission direction of polarizer 2 is the Y direction, stray polarized light in the X direction is filtered out, and the target display light in the Y direction is output.

[0136] Secondly, the natural light from the target does not diverge or converge after passing through the two optical components of the optical imaging system. The divergence occurs after passing through the first optical component, while the convergence occurs after passing through the second, thus ensuring that the natural light from the target does not diverge or converge after passing through the two optical components.

[0137] For example, see Figure 11C As shown in (b), after the target's natural light passes through polarizer 3, only the target's natural light in the Y direction is transmitted. The target's natural light projected through polarizer 3 is polarized light in the Y direction. See also Figure 11CAs shown in (b), since the PDL needs to have positive optical power for the target natural light, PDL1 needs to input right-hand circularly polarized light. The control component keeps ECPS1 in an unpowered state, so that after the input linearly polarized light in the Y direction passes through ECPS1, it remains linearly polarized in the Y direction. Then, after passing through QWP1, the linearly polarized light in the Y direction is converted into left-hand circularly polarized light. This left-hand circularly polarized light then passes through PDL1 and has negative optical power, and the output target natural light is converted into right-hand circularly polarized light. After passing through PDL1, stray polarized light is generated. The stray polarized light has the opposite polarization direction to the target natural light and is left-hand stray polarized light. The right-hand target natural light passes through QWP2 and is converted into linearly polarized light in the X direction, while the left-hand stray polarized light passes through QWP2 and is converted into stray polarized light in the Y direction. The control component keeps ECPS2 powered on. When powered on, ECPS2 converts the target natural light in the X direction into target natural light in the Y direction, while the stray polarized light in the Y direction is converted into stray polarized light in the X direction. Since the transmission direction of 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. After passing through the powered ECPS3, the target natural light in the Y direction converts the linearly polarized light in the Y direction into linearly polarized light in the X direction. Then, after passing through QWP3, the linearly polarized light in the X direction is converted into right-hand circularly polarized light. The right-hand circularly polarized light then passes through PDL2, has negative optical power, and the output target display light is converted into left-hand circularly polarized light. After passing through PDL2, stray polarized light is generated. The stray polarized light has the opposite polarization direction to the target display light, and is right-hand circularly polarized light. The left-hand target display light passes through QWP4, converting it into linearly polarized light in the Y direction, while the right-hand circularly polarized light passes through QWP4, converting it into stray polarized light in the X direction. The control unit keeps ECPS2 in an unpowered state. In this unpowered state, ECPS4 transmits target display light in the Y direction and stray polarized light in the X direction. Since polarizer 2 transmits light in 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.

[0138] As can be seen from the above, the target natural light passes through PDL1, which has positive optical power, and then through PDL2, which has negative optical power, so that it does not diverge or converge.

[0139] See Figure 11D As shown, the optical imaging system is described in AR mode imaging at the far focal plane. The control component will... Figure 11C By reversing the powered or unpowered states of all ECPS in the illustrated embodiment, imaging at the far focal plane can be achieved in AR mode. Furthermore, no increase in optical power is made for natural light, but only for the target display light.

[0140] The following describes how the optical imaging system, under the control of the control component, operates in a VR state. In VR state, the control component can control the optical imaging system to image onto either the near-focal plane or the far-focal plane. In VR state, the optical imaging system needs to prevent natural light from passing through the first and second optical components, thus preventing the target natural light from entering the human eye through the optical imaging system.

[0141] See Figure 12A As shown, the optical imaging system in VR state imaging is described at the far focal plane.

[0142] First, the AR projection component inputs the target display light into the second optical component. Since the focal plane requires the PDL2 to have positive optical power, the PDL needs to input left-handed circularly polarized light. Taking an example where the target display light input into the projection component is linearly polarized light with the polarization direction in the Y direction. See [link to relevant documentation]. Figure 12A As shown in (a), the control component controls ECPS3 to be in a powered-on state. When linearly polarized light in the Y direction is input, ECPS3 transmits the target display light, converting it from Y-direction linearly polarized light to X-direction linearly polarized light. Then, after passing through QWP3, the X-direction linearly polarized light is converted to right-hand circularly polarized light. This right-hand circularly polarized light then passes through PDL2, acquiring positive optical power, and the output target display light is converted to left-hand circularly polarized light. After passing through PDL2, stray polarized light is generated. This stray polarized light has the opposite polarization direction to the target display light, being right-hand circularly polarized. The left-hand circularly polarized target display light, after passing through QWP4, is converted to Y-direction linearly polarized light, while the right-hand circularly polarized stray light, after passing through QWP4, is converted to X-direction stray polarized light. The control component controls ECPS2 to be in a powered-off state. In the powered-off state, ECPS4 transmits the target display light in the Y direction and the stray polarized light in the X direction. Since the transmission direction of polarizer 2 is the Y direction, stray polarized light in the X direction is filtered out, and the target display light in the Y direction is output.

[0143] Secondly, the control component needs to control the switching state, or energized and de-energized state, of ECPS1 and ECPS2 to ensure that the polarization direction of the target natural light input to polarizer 1 is orthogonal to the polarization direction of polarizer 1, thus blocking the target natural light from passing through. Based on this, the control component can control ECPS1 and ECPS2 to be in the same switching state, such as both being energized or both being de-energized. Figure 12A Taking ECPS1 and ECPS2 as an example where both are powered on.

[0144] See Figure 12AAs shown in (b), the control component controls ECPS1 to be in an energized state. Thus, after the target natural light in the Y direction is input, ECPS1 converts the linearly polarized light in the Y direction to linearly polarized light in the X direction after transmission through ECPS1. Then, after passing through QWP1, the linearly polarized light in the X direction is converted to right-hand circularly polarized light. This right-hand circularly polarized light then passes through PDL1, and the output target natural light is converted to left-hand circularly polarized light. The left-hand circularly polarized target natural light passes through QWP2 and is converted to linearly polarized light in the Y direction. The control component controls ECPS2 to be in an energized state. ECPS2, in its energized state, converts the target natural light in the Y direction to target natural light in the X direction. Since the transmission direction of polarizer 1 is the Y direction, the target natural light in the X direction is filtered out, thus preventing the target natural light from entering the human eye. It should be noted that after the target natural light is transmitted through PDL1, stray polarized light may be generated. When the generated stray polarized light passes through the second optical component, some of the stray polarized light will be filtered out, so that the human eye cannot perceive the stray polarized light.

[0145] See Figure 12B As shown, the optical imaging system in VR mode is described at the near-focal plane. The control component will... Figure 12A By reversing the powered or unpowered states of all ECPS in the illustrated embodiment, imaging at the far focal plane can be achieved in VR mode.

[0146] In another possible scenario, this application can realize the switching between different fields of view (FOV) of an optical imaging system. Since the resolution provided by the display device in an optical system is limited, a smaller FOV allows for higher angular resolution of the virtual image, resulting in a clearer and more detailed picture, suitable for scenarios such as reading and browsing the web; while a larger FOV, although the image clarity decreases, provides a better sense of immersion, suitable for scenarios such as gaming. Taking the support for switching between two field of view angles as an example, the two field of view angles are referred to as the first field of view angle and the second field of view angle, respectively. The optical imaging system includes the two optical components described above. A set distance is set between the two optical components. The optical imaging system also includes a converging lens; the control component controls the polarization direction of the polarized light output by the second polarization converter of the first optical component to control the positive optical power of the transmission light component of the first optical component, and controls the polarization direction of the polarized light output by the second polarization converter of the second optical component to control the negative optical power of the transmission light component of the second optical component, so that the field of view of the beam carrying image information input to the optical imaging system after passing through the converging lens is the first field of view angle; the first and second optical components are placed sequentially in the optical path transmission direction.

[0147] The control component controls the polarization direction of the polarized light output by the second polarization converter of the first optical component to control the transmission light component of the first optical component to have negative optical power, and controls the polarization direction of the polarized light output by the second polarization converter of the second optical component to control the transmission light component of the second optical component to have positive optical power, so that the field of view of the beam carrying image information input to the optical imaging system after passing through the converging lens is the first field of view; the first field of view is greater than the second field of view.

[0148] For ease of distinction, the two optical components are referred to as the first optical component and the second optical component, respectively. Taking the two ECPSs in the first optical component as ECPS1 and ECPS2, and the two QWPs as QWP1 and QWP2, and the PDL in the first optical component as PDL1, the two ECPSs in the second optical component are referred to as ECPS3 and ECPS4. The first optical component includes polarizer 1. The two QWPs in the second optical component are referred to as QWP3 and QWP4, and the PDL in the second optical component as PDL2, the second optical component also includes polarizer 2. Using the light conversion relationships of the components shown in Table 4 as an example, the control component controls the optical imaging system at the first field of view (large field of view) and the second field of view (small field of view).

[0149] See Figure 13A As shown, the imaging of the optical imaging system is described in the second field of view (small field of view).

[0150] For a small field of view, PDL1 needs positive optical power and PDL2 needs negative optical power. Therefore, PDL1 requires left-handed circularly polarized light as input, and PDL2 requires right-handed circularly polarized light as input. Take, for example, a target beam input to the display screen that is linearly polarized light with the polarization direction in the Y direction. (See...) Figure 13A As shown, the control component controls ECPS1 to be in an energized state, so that after the input linearly polarized light in the Y direction is transmitted through ECPS1, the target beam is converted from linearly polarized light in the Y direction to linearly polarized light in the X direction. Then, after passing through QWP1, the linearly polarized light in the X direction is converted into right-hand circularly polarized light. Then, the right-hand circularly polarized light passes through PDL and has positive optical power, which converges the input right-hand circularly polarized light, and the output target beam is converted into left-hand circularly polarized light. After passing through PDL, stray polarized light is generated. Figure 13A Stray polarized light (abbreviated as stray light) has the opposite polarization direction to the target beam and is right-handed stray polarized light. Figure 13A(This is referred to as stray light in Chinese). The left-handed target beam, after passing through QWP2, is converted into linearly polarized light in the Y direction, while the right-handed stray polarized light, after passing through QWP2, is converted into stray polarized light in the X direction. The control component keeps ECPS2 in an unpowered state. In the unpowered state, ECPS2 transmits the target beam in the Y direction and the stray polarized light in the X direction. Since the transmission direction of 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. After transmitting over a set distance, the diameter of the target beam in the Y direction gradually decreases before entering the second optical component. Because PDL2 needs to have negative optical power, right-handed circularly polarized light needs to be input into PDL. See also... Figure 13A As shown, the control component keeps ECPS3 in an unpowered state, so that when linearly polarized light in the Y direction is input to ECPS3, it remains linearly polarized in the Y direction after transmission through ECPS1. Then, after passing through QWP3, the linearly polarized light in the Y direction is converted into left-handed circularly polarized light. This left-handed circularly polarized light then passes through PDL2, acquiring negative optical power, and diverges the input left-handed circularly polarized light. After convergence at PDL1 and divergence at PDL2, the beam returns to parallel transmission. PDL2 also converts the left-handed circularly polarized light into right-handed circularly polarized light, and after passing through PDL2, stray polarized light is generated. This stray polarized light has the opposite polarization direction to the target beam, being left-handed stray polarized light. The right-handed target beam, after passing through QWP4, is converted into linearly polarized light in the X direction, while the left-handed stray polarized light, after passing through QWP4, is converted into stray polarized light in the Y direction. The control component keeps ECPS4 powered on. When powered on, ECPS4 converts the target beam in the X direction into a target beam in the Y direction, while stray polarized light in the Y direction is converted into stray polarized light in the X direction. Since the transmission direction of 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 beam is then projected through a converging lens and converged at the human eye, thus achieving the first field of view for the optical imaging system.

[0151] A large field of view requires PDL1 to have negative optical power and PDL2 to have positive optical power. Therefore, PDL1 needs to input right-hand circularly polarized light, and PDL2 needs to input left-hand circularly polarized light. Take, for example, a target beam input to the display screen that is linearly polarized light with the polarization direction in the Y direction. (See...) Figure 13BAs shown, the control component keeps ECPS1 in an unpowered state, so that when linearly polarized light in the Y direction is input, it remains linearly polarized in the Y direction after transmission through ECPS1. Then, after passing through QWP 1, the linearly polarized light in the Y direction is converted into left-hand circularly polarized light. This left-hand circularly polarized light then passes through PDL1, acquiring negative optical power, increasing the target beam diameter, and the output target beam is converted into right-hand circularly polarized light. Furthermore, stray polarized light is generated after passing through PDL. Figure 13B (This is referred to as stray light). Stray polarized light has the opposite polarization direction to the target beam, being left-handed circularly polarized light. The right-handed target beam, after passing through QWP2, is converted into linearly polarized light in the X direction, while the left-handed stray polarized light, after passing through QWP2, is converted into stray polarized light in the Y direction. The control component controls ECPS2 to be in an energized state. When energized, ECPS2 converts the target beam in the X direction into a target beam in the Y direction, and the stray polarized light in the Y direction into 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. After propagating over a set distance, the diameter of the target beam in the Y direction gradually decreases and enters the second optical component. The second optical component requires PDL2 to have negative optical power, therefore PDL2 needs to input left-handed circularly polarized light. The control component keeps ECPS3 powered on, so that when linearly polarized light in the Y direction is input, the target beam is converted from linearly polarized light in the Y direction to linearly polarized light in the X direction after transmission through ECPS3. Then, after passing through QWP3, the linearly polarized light in the X direction is converted to right-hand circularly polarized light. This right-hand circularly polarized light then passes through PDL2, possessing positive optical power, and converts the target beam into left-hand circularly polarized light. After passing through PDL2, stray polarized light is generated. This stray polarized light has the opposite polarization direction to the target beam, being right-hand circularly polarized light. The left-hand circularly polarized target beam, after passing through QWP4, is converted to linearly polarized light in the Y direction, while the right-hand circularly polarized stray light, after passing through QWP4, is converted to stray polarized light in the X direction. The control component keeps ECPS4 powered off. In the unpowered state, ECPS4 transmits the target beam in the Y direction and the stray polarized light in the X direction. Since the transmission direction of polarizer 2 is the Y direction, stray polarized light in the X direction is filtered out, and the target beam in the Y direction is output.

[0152] Based on the above content and the same technical concept, this application embodiment also provides a control method applied to wearable devices.

[0153] Scenario 1: The wearable device is in a near-focal-plane or far-focal-plane state. The wearable device includes optical components, which include state adjustment components and stray polarization cancellation components. See also... Figure 14 As shown: 1401, Receive polarized light carrying image information and input it to the state adjustment component.

[0154] 1402, When the near-focal surface state of the wearable device is activated, the control state adjustment component performs divergence processing on the input polarized light, so that the state adjustment component outputs a first target polarized light and a first stray polarized light; the polarization directions of the first stray polarized light and the first target polarized light are orthogonal.

[0155] 1403, control the stray polarization elimination component to adjust the polarization direction of the first stray polarization light so that the stray polarization elimination component eliminates the first stray polarization light and outputs the first target polarization light.

[0156] See Figure 15 As shown: 1501, receives polarized light carrying image information and inputs it to the state adjustment component.

[0157] 1502, When the telephoto plane state of the wearable device is activated, the control state adjustment component performs focusing processing on the input polarized light, so that the state adjustment component outputs the second target polarized light and the second stray polarized light; the polarization direction of the second stray polarized light is orthogonal to that of the second target polarized light. 1503, Control the stray polarization light elimination component to adjust the polarization direction of the second stray polarization light so that the stray polarization light elimination component eliminates the second stray polarization light and outputs the second target polarization light; The polarized light of the first target is orthogonal to the polarized light of the second target.

[0158] In one possible implementation, the stray polarization elimination component includes a second polarization converter and a first polarizer, wherein the first polarizer transmits only polarized light with a first polarization direction; the first stray polarized light has a second polarization direction and the first target polarized light has a first polarization direction, and the second stray polarized light has a first polarization direction and the second target polarized light has a first polarization direction. When the stray polarization elimination component adjusts the polarization direction of the first stray polarized light, it can be achieved by controlling the polarization direction of the polarized light output by the second polarization converter to maintain the polarization direction of the polarized light, so that the first polarizer eliminates the first stray polarized light. When the stray polarization elimination component adjusts the polarization direction of the second stray polarized light, it can be achieved by controlling the polarization direction of the second target polarized light output by the second polarization converter to be the first polarization direction, and controlling the polarization direction of the second stray polarized light output by the second polarization converter to be the second polarization direction, so that the first polarizer eliminates the second stray polarized light.

[0159] In another possible implementation, the stray polarization elimination component includes a second polarization converter and a first polarizer, the first polarizer transmitting only polarized light with a second 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 polarization elimination component can adjust the polarization direction of the first stray polarized light by controlling the polarization direction of the first target polarized light output by the second polarization converter switching 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 to be the first polarization direction, so that the first polarizer eliminates the first stray polarized light.

[0160] The stray polarization elimination component adjusts the polarization direction of the second stray polarized light by controlling the polarization direction of the polarized light output by the second polarization converter holding state adjustment component, so that the first polarizer eliminates the second stray polarized light.

[0161] Scenario 2: The wearable device is in AR or VR mode. The wearable device sequentially includes a first optical component, an optical waveguide, and a second optical component along the optical path propagation direction; the first optical component includes a first state adjustment component and a first stray polarization elimination component, and the second optical component includes a second state adjustment component and a second stray polarization elimination component.

[0162] See Figure 16 As shown, the wearable device is in VR mode.

[0163] 1601, receiving first polarized light obtained by converting natural light and inputting it into the first optical component, and receiving second polarized light carrying image information and inputting it into the second optical component through the optical waveguide.

[0164] 1602, When the virtual reality (VR) state of the wearable device is activated, the first state adjustment component is controlled to output the first target polarized light when the first polarized light is input; 1603, control the first stray polarization light elimination component to adjust the polarization direction of the first target polarization light so that the first stray polarization light elimination component eliminates the first target polarization light, thereby preventing the first target polarization light from being input into the second optical component through the optical waveguide; 1604, the second state adjustment component is controlled to output a second target polarized light and a first stray polarized light when the second polarized light is input. The second state adjustment 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 that of the second target polarized light. 1605, control the second stray polarization light elimination component to adjust the polarization direction of the first stray polarization light so that the second stray polarization light elimination component eliminates the first stray polarization light and outputs the second target polarization light.

[0165] See Figure 17 As shown, the wearable device is in AR mode.

[0166] 1701, receiving first polarized light obtained by converting natural light and inputting it into the first optical component, and receiving second polarized light carrying image information and inputting it into the second optical component; 1702, When the augmented reality (AR) state of the wearable device is activated, the first state adjustment component is controlled to output a third target polarized light and a second stray polarized light when the first polarized light is input; the polarization direction of the second stray polarized light is orthogonal to that of the third target polarized light; 1703, control the first stray polarization elimination component to adjust the polarization direction of the second stray polarization light so that the first stray polarization elimination component eliminates the second stray polarization light, and outputs the third target polarization light through the light waveguide second optical component; 1704, 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; the polarization direction of the third stray polarized light is orthogonal to that of the fourth target polarized light; 1705, control the second stray polarization elimination component to adjust the polarization direction of the third stray polarization light so that the second stray polarization elimination component eliminates the third stray polarization light and outputs the fourth target polarization light.

[0167] Scenario 2: The wearable device is in a large FOV or small FOV state. The wearable device includes a first optical component and a second optical component, which are coupled together and spaced apart by a set distance. The first optical component includes a first state adjustment component and a first stray polarization elimination component, and the second optical component includes a second state adjustment component and a second stray polarization elimination component.

[0168] See Figure 18 As shown: The wearable device is in a large FOV (first field of view) state.

[0169] 1801, Receive polarized light carrying image information and input it into the first optical component.

[0170] 1802, when the first field of view state of the wearable device is turned on, the first state adjustment component is controlled 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, and the polarization direction of the first stray polarized light is orthogonal to that of the first target polarized light.

[0171] 1803, control the first stray polarization light elimination component to adjust the polarization direction of the first stray polarization light so that the first stray polarization light elimination component eliminates the first stray polarization light and outputs the first target polarization light to the second optical component.

[0172] 1804, control the second state adjustment component to converge the first target polarized light, so that the second state adjustment component outputs the second target polarized light and the second stray polarized light, the polarization direction of the second stray polarized light being orthogonal to the polarization direction of the second target polarized light.

[0173] 1805, control the second stray polarization light elimination component to adjust the polarization direction of the second stray polarization light so that the second stray polarization light elimination component eliminates the second stray polarization light and outputs the second target polarization light.

[0174] See Figure 19 As shown: The wearable device is in a small FOV (second field of view) state.

[0175] 1901, Receive polarized light carrying image information and input it into the first optical component; 1902, when the second field of view state of the wearable device is turned on, the first state adjustment component is controlled to converge the polarized light, so that the first state adjustment component outputs the third target polarized light and the third stray polarized light, and the polarization direction of the third stray polarized light is orthogonal to that of the third target polarized light. 1903, control the first stray polarization elimination component to adjust the polarization direction of the third stray polarization light so that the first stray polarization elimination component eliminates the third stray polarization light and outputs the third target polarization light to the second optical component; 1904, control the second state adjustment component to perform divergence processing on the third target polarized light, so that the second state adjustment component outputs the fourth target polarized light and the fourth stray polarized light, the polarization direction of the fourth stray polarized light is orthogonal to the polarization direction of the fourth target polarized light; 1905, control the second stray polarization light elimination component to adjust the polarization direction of the fourth stray polarization light so that the second stray polarization light elimination component eliminates the fourth stray polarization light and outputs the fourth target polarization light.

[0176] The method steps in the embodiments of this application can be implemented in hardware or by a processor executing software instructions. The software instructions can consist of corresponding software modules, which can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, portable hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. Furthermore, the ASIC can reside in a head-mounted display device or terminal device. Alternatively, the processor and storage medium can exist as discrete components in the head-mounted display device or terminal device.

[0177] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of this application are performed entirely or partially. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment, or other programmable device. The computer program or instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video disc (DVD); or it can be a semiconductor medium, such as a solid-state drive (SSD).

[0178] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0179] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and 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 singular or plural items. For example, at least one of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple. In the textual description of this application, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. In the formulas of this application, the character " / " indicates that the preceding and following related objects are in a "division" relationship. In this application, the symbol "(a, b)" represents an open interval, with a range greater than a and less than b; "[a, b]" represents a closed interval, with a range greater than or equal to a and less than or equal to b; "(a, b]" represents a half-open interval, with a range greater than a and less than or equal to b; and "(a, b]" represents a half-open interval, with a range greater than a and less than or equal to b. Furthermore, in this application, the term "exemplary" is used to indicate that it is an example, illustration, or description. Any embodiment or design described as "exemplary" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Alternatively, it can be understood that the use of the term "exemplary" is intended to present concepts in a specific manner and does not constitute a limitation on this application.

[0180] It is understood that the various numerical designations used in this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. The order of the process numbers described above does not imply the order of execution; the execution order of each process should be determined by its function and inherent logic. Terms such as "first," "second," and similar expressions are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as including a series of steps or units. A method, system, product, or device is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0181] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made therein without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely illustrative examples of the solutions defined by the appended claims and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application.

[0182] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of this application. Therefore, if these modifications and variations of the embodiments of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. An optical imaging system, characterized in that, It includes optical components and control components, wherein the optical components include a state adjustment component and a stray polarization elimination component; The state adjustment component is used to adjust the beam state of the input polarized light under the control of the control component, outputting target polarized light and stray polarized light, wherein the stray polarized light is orthogonal to the polarization direction of the target polarized light; the beam state adjustment includes divergence processing or convergence processing; the state adjustment component includes a second polarization converter and a transmission light component, the second polarization converter is used to adjust the polarization direction of the input polarized light, and the transmission light component includes a polarization-dependent lens; The stray polarization elimination component is used to receive the target polarized light and the stray polarized light, and adjust the polarization direction of the stray polarized light under the control of the control component, so as to eliminate the stray polarized light and output the target polarized light; The stray polarization elimination component includes a first polarization converter and a first polarizer; the first polarization converter is used to maintain the polarization direction of the target polarized light and stray polarized light output by the transmission light component or to change the polarization direction of the target polarized light and stray polarized light output by the transmission light component, and the polarization direction of the target polarized light output by the first polarization converter to the first polarizer is the same as the transmission direction of the first polarizer.

2. The optical imaging system as described in claim 1, characterized in that, The control component is specifically used for: When the target polarized light output by the state adjustment component 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 target polarized light output by the state adjustment component has a second polarization direction and the stray polarized light has a first polarization direction, the first polarization converter is controlled to convert the polarization direction of the target polarized light output by the state adjustment component to the first polarization direction, and to convert the polarization direction of the stray polarized light output by the state adjustment component to the second polarization direction. Wherein, the first polarization direction is orthogonal to the second polarization direction, and the first polarization converter is any one of the following: nematic liquid crystal cell, orthogonally arranged VA liquid crystal cell, flat panel to IPS liquid crystal cell, electrically controlled twisted nematic TN liquid crystal cell, electrically controlled nonlinear crystal, or electrically controlled ferroelectric liquid crystal cell.

3. The optical imaging system as described in claim 2, characterized in that, The control component is specifically used for: Controlling the first polarization converter to be in an unpowered state, so that the first polarization converter maintains the polarization direction of the polarized light output by the state adjustment component; or, The first polarization converter is controlled to be in a powered-on state, so that the first polarization converter converts the polarization direction of the target polarized light output by the state adjustment component to the first polarization direction, and converts the polarization direction of the stray polarized light output by the state adjustment component to the second polarization direction.

4. The optical imaging system as described in claim 2, characterized in that, The control component is specifically used for: The first polarization converter is controlled to be in an energized state, so that the first polarization converter maintains the polarization direction of the polarized light output by the state adjustment component; or, The first polarization converter is controlled to be in an unpowered state, so that the first polarization converter converts the polarization direction of the target polarized light output by the state adjustment component to the first polarization direction, and converts the polarization direction of the stray polarized light output by the state adjustment component to the second polarization direction.

5. The optical imaging system according to any one of claims 1-4, characterized in that, The transmitted light component is specifically used to diverge or converge the input polarized light under the control of the control component.

6. The optical imaging system according to any one of claims 1-4, characterized in that, The transmitted light component includes, in sequence, a first quarter-wave plate, a polarization-dependent lens, and a second quarter-wave plate in the direction of light propagation. The polarization-dependent lens is any one of a liquid crystal lens, a liquid crystal geometric phase lens, a metasurface polarizing lens, or a metasurface geometric phase lens.

7. The optical imaging system as described in claim 6, characterized in that, The fast axis optical axis of the first quarter wave plate coincides with the fast axis optical axis of the second quarter wave plate; The control component is specifically used to control the second polarization converter to have an enable state opposite to that of the first polarization converter.

8. The optical imaging system as described in claim 6, characterized in that, The fast axis optical axis of the first quarter wave plate is orthogonal to the fast axis optical axis of the second quarter wave plate; The control component is specifically used to control the second polarization converter to have the same enable state as the first polarization converter.

9. The optical imaging system according to any one of claims 1-4, characterized in that, The optical imaging system includes N optical components, where N is a positive integer; the optical imaging system supports imaging in at most Any one of the focal planes; The control component is specifically used to control the beam state of the target polarized light output by the state adjustment components of the N optical components, so that the optical focal plane of the imaging system is in the at most Switching between different focal planes.

10. The optical imaging system according to any one of claims 1-4, characterized in that, The optical imaging system includes at least two optical components, with a predetermined distance between the two optical components; the optical imaging system supports a first field of view and a second field of view; the optical imaging system also includes a converging lens; The control component 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, and to control the state adjustment component included in the second optical component of the two optical components to have a positive optical power, so that the field of view of the polarized light carrying image information input to the optical imaging system after passing through the converging lens is a first field of view; the first optical component and the second optical component are placed sequentially in the optical path propagation direction; Alternatively, specifically, by controlling the state adjustment component included in the first optical component of the two optical components to have a positive optical power, and controlling the state adjustment component included in the second optical component of the two optical components to have a negative optical power, the field of view of the polarized light carrying image information input to the optical imaging system after passing through the converging lens is the second field of view; the first field of view is greater than the second field of view.

11. The optical imaging system according to any one of claims 1-4, characterized in that, The optical imaging system includes at least two optical components, and further includes a second polarizer. The second polarizer is coupled to a first optical component of the two optical components. The first optical component is coupled to the second optical component of the two optical components through an optical waveguide. The first optical component, the optical waveguide, and the second optical component are placed sequentially in the optical path propagation direction. The optical imaging system supports both AR and VR modes. The optical imaging system also includes: A projection component is used to input polarized light of an image into the second optical component through the optical waveguide; The second polarizer is used to convert the input natural light into polarized light and input it into the first optical component; The control component is specifically used for: The optical imaging system is in AR mode by controlling the first optical component to be in an active state and controlling the second optical component to be in an active state; or, the optical imaging system is in VR mode by controlling the first optical component to be in a non-active state and controlling the second optical component to be in an active state. Wherein, when the first optical component is in a non-operating state, the stray polarization elimination component of the first optical component is used to eliminate the target polarized light; when the first optical component is in an operating state, the stray polarization elimination component of the first optical component is used to eliminate the stray polarized light; when the second optical component is in an operating state, the stray polarization elimination component of the second optical component is used to eliminate the stray polarized light.

12. A control method, characterized in that, The method is applied to a wearable device, which includes an optical component, the optical component including a state adjustment component and a stray polarization elimination component; Receive polarized light carrying image information and input it into the state adjustment component; When the near-focal plane state of the wearable device is activated, the state adjustment component is controlled to diverge the input polarized light, so that the state adjustment component outputs a first target polarized light and a first stray polarized light; the polarization direction of the first stray polarized light is orthogonal to that of the first target polarized light. The stray polarization elimination component is controlled to adjust the polarization direction of the first stray polarization light so that the stray polarization elimination component eliminates the first stray polarization light and outputs the first target polarization light; When the telephoto plane state of the wearable device is activated, the state adjustment component is controlled to converge the input polarized light, so that the state adjustment component outputs a second target polarized light and a second stray polarized light; the polarization direction of the second stray polarized light is orthogonal to that of the second target polarized light. The stray polarization elimination component is controlled to adjust the polarization direction of the second stray polarization light so that the stray polarization elimination component eliminates the second stray polarization light and outputs the second target polarization light; Wherein, the first target polarized light is orthogonal to the second target polarized light; The state adjustment component includes a second polarization converter and a transmission light component, the transmission light component including a polarization-dependent lens; the second polarization converter is used to adjust the polarization direction of the input polarized light; The stray polarization elimination component includes a second polarization converter and a first polarizer. The second polarization converter is used to maintain the polarization directions of the target polarized light and stray polarized light output by the state adjustment component, or to change the polarization directions of the target polarized light and stray polarized light output by the state adjustment component. The polarization direction of the target polarized light output by the second polarization converter to the first polarizer is the same as the transmission direction of the first polarizer. The target polarized light is either a first target polarized light or a second target polarized light, and the stray polarized light is either a first stray polarized light or a second stray polarized light.

13. The method as described in claim 12, characterized in that, The first polarizer transmits only polarized light with a 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 second polarization direction; the step of controlling the stray polarization elimination component to adjust the polarization direction of the first stray polarized light includes: The second polarization converter is controlled to maintain the polarization direction of the polarized light output by the state adjustment component, so that the first polarizer eliminates the first stray polarized light; The method of controlling the stray polarization elimination component to adjust the polarization direction of the second stray polarization light includes: The second polarization converter is controlled to convert the polarization direction of the second target polarized light output by the state adjustment component to the first polarization direction, and to convert the polarization direction of the second stray polarized light output by the state adjustment component to the second polarization direction, so that the first polarizer eliminates the second stray polarized light.

14. The method as described in claim 12, characterized in that, The first polarizer transmits only polarized light with a second 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 second polarization direction; The method of controlling the stray polarization elimination component to adjust the polarization direction of the first stray polarization light includes: The second polarization converter is controlled to convert the polarization direction of the first target polarized light output by the state adjustment component to the second polarization direction, and to convert the polarization direction of the first stray polarized light output by the state adjustment component to the first polarization direction, so that the first polarizer eliminates the first stray polarized light. The method of controlling the stray polarization elimination component to adjust the polarization direction of the second stray polarization light includes: The second polarization converter is controlled to maintain the polarization direction of the polarized light output by the state adjustment component, so that the first polarizer eliminates the second stray polarized light.

15. The method as described in claim 13, characterized in that, Controlling the second polarization converter to maintain the polarization direction of the polarized light output by the state adjustment component includes: The second polarization converter is controlled to be in an energized state, so that the second polarization converter maintains the polarization direction of the polarized light output by the state adjustment component; Controlling the second polarization converter to convert the polarization direction of the second target polarized light output by the state adjustment component to the first polarization direction, and to convert the polarization direction of the second stray polarized light output by the state adjustment component to the second polarization direction, includes: The second polarization converter is controlled to be in an unpowered state, so that the second polarization converter converts the polarization direction of the second target polarized light output by the state adjustment component to the first polarization direction, and converts the polarization direction of the second stray polarized light output by the state adjustment component to the second polarization direction.

16. A control method, characterized in that, The method is applied to a wearable device, which sequentially includes a first optical component, an optical waveguide, and a second optical component in the optical path propagation direction. The first optical component includes a first state adjustment component and a first stray polarization elimination component, and the second optical component includes a second state adjustment component and a second stray polarization elimination component. Either the first state adjustment component or the second state adjustment component includes a second polarization converter and a transmission light component, wherein the transmission light component includes a polarization-dependent lens. The second polarization converter is used to adjust the polarization direction of the input polarized light. Each of the first stray polarization elimination component and the second stray polarization elimination component includes a first polarization converter and a first polarizer. The first polarization converter is used to maintain the polarization direction of the target polarized light and the stray polarized light output by the state adjustment component, or to change the polarization direction of the target polarized light and the stray polarized light output by the state adjustment component. In the first stray polarization elimination component, the polarization direction of the first target polarized light output by the first polarization converter to the first polarizer is opposite to the transmission direction of the first polarizer. In the second stray polarization elimination component, the polarization direction of the second target polarized light output by the first polarization converter to the first polarizer is the same as the transmission direction of the first polarizer. The stray polarized light is either the first stray polarized light or the second stray polarized light. The system receives first polarized light obtained by converting natural light and inputs it into the first optical component; it also receives second polarized light carrying image information and inputs it into the second optical component through the optical waveguide. When the wearable device is in virtual reality (VR) mode, the first state adjustment component is controlled to output the first target polarized light when the first polarized light is input. The first stray polarization elimination component is controlled to adjust the polarization direction of the first target polarized light so that the first stray polarization elimination component eliminates the first target polarized light, thereby preventing the first target polarized light from being input into the second optical component through the optical waveguide; The second state adjustment component is controlled to output a second target polarized light and a first stray polarized light when the second polarized light is input. The second state adjustment 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 that of the second target polarized light. The second stray polarization elimination component is controlled to adjust the polarization direction of the first stray polarization light so that the second stray polarization elimination component eliminates the first stray polarization light and outputs the second target polarization light.

17. A control method, characterized in that, The method is applied to a wearable device, which sequentially includes a first optical component, an optical waveguide, and a second optical component in the optical path propagation direction. The first optical component includes a first state adjustment component and a first stray polarization elimination component, and the second optical component includes a second state adjustment component and a second stray polarization elimination component. Either the first state adjustment component or the second state adjustment component includes a second polarization converter and a transmission light component, wherein the transmission light component includes a polarization-dependent lens. The second polarization converter is used to adjust the polarization direction of the input polarized light. Each of the first stray polarization elimination component and the second stray polarization elimination component includes a first polarization converter and a first polarizer. The first polarization converter is used to maintain the polarization direction of the target polarized light and the stray polarized light output by the state adjustment component, or to change the polarization direction of the target polarized light and the stray polarized light output by the state adjustment component. The polarization direction of the target polarized light output by the first polarization converter to the first polarizer is the same as the transmission direction of the first polarizer. The target polarized light is either a first target polarized light or a second target polarized light, and the stray polarized light is either a first stray polarized light or a second stray polarized light. The system receives first polarized light converted from natural light and inputs it into the first optical component; it also receives second polarized light carrying image information and inputs it into the second optical component. When the augmented reality (AR) state of the wearable device is activated, the first state adjustment component is controlled to adjust the beam state of the input first polarized light and output a third target polarized light and a second stray polarized light; the polarization direction of the second stray polarized light is orthogonal to that of the third target polarized light; the beam state adjustment includes divergence processing or convergence processing; The first stray polarization elimination component is controlled to adjust the polarization direction of the second stray polarization light so that the first stray polarization elimination component eliminates the second stray polarization light, and the third target polarization light is output by the second optical component through the light waveguide; The second state adjustment component is controlled to adjust the beam state of the input third polarized light and output a fourth target polarized light and a third stray polarized light; the third polarized light includes the third target polarized light and the second polarized light; the polarization direction of the third stray polarized light is orthogonal to that of the fourth target polarized light; The second stray polarization elimination component is controlled to adjust the polarization direction of the third stray polarization light so that the second stray polarization elimination component eliminates the third stray polarization light and outputs the fourth target polarization light.

18. A control method, characterized in that, The method is applied to a wearable device, which includes a first optical component and a second optical component. The first optical component is coupled to the second optical component and the two optical components are spaced apart by a predetermined distance. The first optical component includes a first 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. Either the first state adjustment component or the second state adjustment component includes a second polarization converter and a transmission light component. The transmission light component includes a polarization-dependent lens. The second polarization converter is used to polarize the input polarized light. The direction of vibration is adjusted; either the first stray polarization elimination component or the second stray polarization elimination component includes a first polarization converter and a first polarizer. The first polarization converter is used to maintain the polarization direction of the target polarized light and the stray polarized light output by the state adjustment component, or to change the polarization direction of the target polarized light and the stray polarized light output by the state adjustment component. The polarization direction of the target polarized light output by the first polarization converter to the first polarizer is the same as the transmission direction of the first polarizer. The target polarized light is either a first target polarized light or a second target polarized light, and the stray polarized light is either a first stray polarized light or a second stray polarized light. 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, the first state adjustment component is controlled to diverge the polarized light, so that the first state adjustment component outputs a first target polarized light and a first stray polarized light, wherein the polarization direction of the first stray polarized light is orthogonal to that of the first target polarized light. The first stray polarization elimination component is controlled to adjust the polarization direction of the first stray polarization light so that the first stray polarization elimination component eliminates the first stray polarization light and outputs the first target polarization light to the second optical component; The second state adjustment component is controlled to converge the first target polarized light, so that the second state adjustment component outputs a second target polarized light and a second stray polarized light, the polarization direction of the second stray polarized light being orthogonal to that of the second target polarized light; The second stray polarization elimination component is controlled to adjust the polarization direction of the second stray polarization light so that the second stray polarization elimination component eliminates the second stray polarization light and outputs the second target polarization light.

19. A control method, characterized in that, The method is applied to a wearable device, which includes a first optical component and a second optical component. The first optical component is coupled to the second optical component and the two optical components are spaced apart by a predetermined distance. The first optical component includes a first 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. Either the first state adjustment component or the second state adjustment component includes a second polarization converter and a transmission light component. The transmission light component includes a polarization-dependent lens. The second polarization converter is used to polarize the input polarized light. The direction of vibration is adjusted; either the first stray polarization elimination component or the second stray polarization elimination component includes a first polarization converter and a first polarizer. The first polarization converter is used to maintain the polarization direction of the target polarized light and the stray polarized light output by the state adjustment component, or to change the polarization direction of the target polarized light and the stray polarized light output by the state adjustment component. The polarization direction of the target polarized light output by the first polarization converter to the first polarizer is the same as the transmission direction of the first polarizer. The target polarized light is either a first target polarized light or a second target polarized light, and the stray polarized light is either a first stray polarized light or a second stray polarized light. 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, the first state adjustment component is controlled to converge the polarized light, so that the first state adjustment component outputs a third target polarized light and a third stray polarized light, wherein the polarization direction of the third stray polarized light is orthogonal to that of the third target polarized light. The first stray polarization elimination component is controlled to adjust the polarization direction of the third stray polarization light so that the first stray polarization elimination component eliminates the third stray polarization light and outputs the third target polarization light to the second optical component; The second state adjustment component is controlled to perform divergence processing on the third target polarized light, so that the second state adjustment component outputs a fourth target polarized light and a fourth stray polarized light, wherein the polarization direction of the fourth stray polarized light is orthogonal to that of the fourth target polarized light; The second stray polarization elimination component is controlled to adjust the polarization direction of the fourth stray polarization light so that the second stray polarization elimination component eliminates the fourth stray polarization light and outputs the fourth target polarization light.

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