AR optical waveguide virtual image dynamic adjustment display device, method, equipment and medium

Abstract

The invention provides an AR optical waveguide virtual image dynamic adjustment display device, method and equipment and a medium, and the device comprises an optical machine module which is used for generating imaging light with linear polarization or circular polarization characteristics; the polarization modulation module is connected with the optical machine module and is used for dynamically switching the polarization state of the imaging light by adopting an electro-optical modulator; the coupling-in grating is arranged on the light incident side of the waveguide main body and is used for coupling the imaging light into the waveguide main body; the waveguide main body is used for transmitting the imaging light entering through the coupling grating in a total reflection mode; the metasurface coupling-out grating is arranged on the light emitting side of the waveguide main body and is used for coupling out the imaging light at different emergence angles according to the polarization state of the imaging light to form a position-adjustable virtual image; and the control module is in communication connection with the polarization modulation module and is used for controlling the polarization modulation module to switch the polarization state of the imaging light according to the user input signal so as to solve the problems that the system is complicated, the thickness is increased and the efficiency of emergent light is reduced due to the fact that the spatial position in the augmented reality optical display system cannot be changed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of augmented reality optical display technology, and in particular to an AR optical waveguide virtual image dynamic adjustment display device, method, equipment and medium. BACKGROUND

[0002] The current augmented reality (AR) optical display system generally uses a diffractive optical waveguide as the core component of image display. A typical waveguide structure includes: a coupling-in grating, a waveguide main body, and a coupling-out grating. The imaging light from an optical engine (such as an LCOS or MicroLED light source) enters the waveguide through the coupling-in grating and propagates inside the waveguide in a total reflection manner, and finally exits the human eye at a set angle through the coupling-out grating to form a virtual image. At present, the existing AR optical display still has the following problems: 1. Fixed virtual image position: The exit angle of the existing diffractive waveguide is fixedly designed, and the virtual image position cannot be dynamically adjusted according to the user's line of sight direction or application scene.

[0003] 2. Complex multi-layer structure: In order to realize different angles of exit, a multi-layer grating superposition scheme is often used, which increases the processing difficulty, reduces the coupling efficiency, and increases the cost.

[0004] 3. Limited user experience: When the virtual image is fixed in the central field of view, it is easy to block the user's line of sight for observing the real world, especially in navigation, inspection and other applications, which affects safety and comfort.

[0005] In summary, in the prior art, the exit angle is mainly determined by the grating period, depth and refractive index, and once it is determined, it is fixed in manufacturing. Therefore, the display position of the virtual image (such as the front, upper or right) is locked in the design stage, and the user cannot change its spatial position during use. In addition, if multiple exit directions are to be realized, multiple layers of gratings or multiple waveguide structures are usually stacked in the same waveguide, which will lead to system complexity, increased thickness, and reduced exit light efficiency.

[0006] Therefore, it is urgent to propose an AR optical waveguide virtual image dynamic adjustment display device to solve the problem that the spatial position cannot be changed in the augmented reality optical display system, leading to system complexity, increased thickness, and reduced exit light efficiency. SUMMARY

[0007] In order to overcome the problems in the related art, the present application provides an AR optical waveguide virtual image dynamic adjustment display device, method, equipment and medium to solve the technical problem that the spatial position cannot be changed in the augmented reality optical display system in the related art, leading to system complexity, increased thickness, and reduced exit light efficiency.

[0008] The one or more embodiments of the specification provide an AR optical waveguide virtual image dynamic adjustment display device, comprising: An optical machine module for generating imaging light with linear polarization or circular polarization characteristics; A polarization modulation module connected to the optical machine module for dynamically switching the polarization state of the imaging light using an electro-optic modulator; A coupling-in grating arranged on the light-in side of the waveguide main body for coupling the imaging light into the waveguide main body; A waveguide main body for transmitting the imaging light entering through the coupling-in grating in a total reflection manner; A metasurface coupling-out grating arranged on the light-out side of the waveguide main body for coupling out the imaging light at different exit angles according to the polarization state of the imaging light, forming a position-adjustable virtual image; A control module in communication connection with the polarization modulation module for controlling the polarization modulation module to switch the polarization state of the imaging light according to a user input signal.

[0009] Preferably, the polarization modulation module is an electro-optic modulator, including at least one of a liquid crystal polarization rotator, a Pockels cell or a metasurface polarization controller.

[0010] Preferably, the waveguide main body is made of a transparent high refractive index material, being any one of glass, silicon carbide, resin or polymer.

[0011] Preferably, the metasurface coupling-out grating includes anisotropic nano units, tilted gratings or blazed gratings, the anisotropic nano units being any one of rectangular nano pillars, elliptical nano pillars or nano grooves; By adjusting the grating tilt angle, period and height, and the long axis, short axis and height parameters of the anisotropic nano units, the S-polarized light and the P-polarized light obtain different phase responses and coupling-out efficiencies.

[0012] Preferably, the metasurface coupling-out grating is composed of a single-layer polarization-selective metasurface grating, corresponding to different exit angles for S-polarized light and P-polarized light, realizing position switching of the virtual image in the horizontal or vertical direction.

[0013] Preferably, the control module is configured to control the polarization modulation module to switch the polarization state of the imaging light according to the user's line of sight, application scenario or gesture instruction, realizing automatic adjustment of the virtual image position.

[0014] Preferably, the coupling-in grating diffracts the S-polarized light and the P-polarized light into the same propagation direction, ensuring the same direction transmission of light in the waveguide.

[0015] The one or more embodiments of the specification provide an AR optical waveguide virtual image dynamic adjustment display method, comprising the following steps: The imaging light with linear polarization or circular polarization characteristics is generated by the light machine module; The imaging light emitted by the light machine module is received by the polarization modulation module, and the polarization state of the imaging light is dynamically switched by an electro-optical modulator; The imaging light is coupled into the waveguide body by the coupling-in grating arranged on the light-in side of the waveguide body; The imaging light entering the waveguide body through the coupling-in grating is transmitted in a total reflection manner by the waveguide body; The imaging light is coupled out at different exit angles according to the polarization state of the imaging light by the super surface coupling-out grating arranged on the light-out side of the waveguide body, forming a position-adjustable virtual image; The polarization state of the imaging light is switched by the polarization modulation module according to the user input signal by the control module in communication connection with the polarization modulation module.

[0016] One or more embodiments of the present specification provide a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the AR optical waveguide virtual image dynamic adjustment display method as described above when executing the computer program.

[0017] One or more embodiments of the present specification provide a computer readable storage medium, which stores a computer program, wherein the computer program is executed by a processor to implement the steps of the AR optical waveguide virtual image dynamic adjustment display method as described above.

[0018] The application provides an AR optical waveguide virtual image dynamic adjustment display device, method, equipment and medium, which has the advantages that the optical machine module is used for generating imaging light with linear polarization or circular polarization characteristics, providing a core optical signal basis for the entire AR display device, the output polarized light not only meets the optical characteristic requirements of subsequent polarization modulation, grating coupling and other links, ensures that the optical signal has a controllable physical prerequisite, but also guarantees the intensity stability and beam quality of the imaging light; the polarization modulation module is connected with the optical machine module and is used for dynamically switching the polarization state of the imaging light by using an electro-optic modulator, breaking through the limitation of fixed polarized light and giving the optical signal controllable polarization characteristics, the switching process has fast response speed, accurate polarization state switching and strong stability, can flexibly switch the linear polarization direction or convert between the positive and negative rotation directions of the circular polarization according to the instruction of the control module, and provides variable input conditions for the angle selection of the metasurface out-coupling grating; the in-coupling grating is arranged on the light-in side of the waveguide main body and is used for coupling the imaging light into the waveguide main body, can efficiently and directionally couple the imaging light output by the optical machine module into the waveguide main body, through grating structure design, can maximize the energy loss in the optical signal coupling process, and at the same time, ensures that the coupled imaging light meets the angle requirements of the waveguide main body total reflection transmission; the waveguide main body is used for transmitting the imaging light entering through the in-coupling grating in a total reflection mode, through the total reflection mechanism, the imaging light can realize long-distance transmission in the waveguide without additional light path guidance, which not only simplifies the device structure, but also avoids the polarization state distortion and intensity attenuation of the optical signal in the transmission process, ensures that the optical signal reaching the metasurface out-coupling grating still maintains accurate polarization characteristics and sufficient energy, and provides stable transmission channel support for clear imaging and position adjustment of the virtual image; the metasurface out-coupling grating is arranged on the light-out side of the waveguide main body and is used for coupling out the imaging light at different exit angles according to the polarization state of the imaging light, forming a position-adjustable virtual image, through the directional response characteristics of the metasurface structure to different polarization state optical signals, the imaging light with a specific polarization state can be accurately coupled out of the waveguide main body at a corresponding preset angle, realizing dynamic switching of the spatial position of the virtual image, and the grating structure design guarantees the directionality and concentration of the coupled-out light, avoids distortion, ghosting and other problems of the virtual image, ensures that the virtual images at different positions all have clear imaging quality, and directly realizes the core function of dynamic adjustment of the virtual image of the device; the control module is in communication connection with the polarization modulation module and is used for controlling the polarization modulation module to switch the polarization state of the imaging light according to the user input signal, can quickly receive the user input signal and transmit it to the polarization modulation module as a precise control instruction, realizing polarization state switching and real-time matching with user demand. The module has the characteristics of clear control logic, low response delay and precise instruction execution, provides a reliable control core for the virtual image dynamic adjustment of the entire device, ensures that the user can conveniently and efficiently realize the on-demand adjustment of the virtual image position, and is a key guarantee for the human-computer interaction and function landing of the device. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the one or more embodiments of the present specification or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present specification, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 A structural schematic diagram of an AR optical waveguide virtual image dynamic adjustment display device provided by one or more embodiments of the present specification is shown. Figure 2 A schematic diagram of a control module changing a virtual image position provided by one or more embodiments of the present specification is shown. Figure 3 A schematic diagram of an outcoupling grating and a waveguide coupling out S light and P light provided by one or more embodiments of the present specification is shown. Figure 4 A flowchart of an AR optical waveguide virtual image dynamic adjustment display method provided by one or more embodiments of the present specification is shown. Figure 5 A structural schematic diagram of a computer device provided by one or more embodiments of the present specification is shown. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the one or more embodiments of the present specification, the technical solutions in the one or more embodiments of the present specification will be described clearly and completely in conjunction with the drawings of the one or more embodiments of the present specification. Obviously, the described embodiments are only some embodiments of the present specification, not all embodiments. Based on the one or more embodiments of the present specification, all other embodiments obtained by those skilled in the art without creative labor should be within the protection scope of the present specification.

[0022] The present application will be described in detail below in conjunction with the specific embodiments and the drawings of the specification.

[0023] Device embodiments According to the embodiments of the present application, an AR optical waveguide virtual image dynamic adjustment display device is provided. By introducing a metasurface structure at the waveguide exit end, spatial angle branching of light with different polarization states is realized, thereby realizing controllable switching or continuous adjustment of the virtual image position. As shown in the structural schematic diagram of the AR optical waveguide virtual image dynamic adjustment display device provided by the present embodiment, the AR optical waveguide virtual image dynamic adjustment display device according to the embodiments of the present application comprises: Figure 1 A light-mechanical module 11 for generating imaging light with linear or circular polarization characteristics. The light-mechanical module 11 is used to generate imaging light with linear or circular polarization characteristics.

[0024] A polarization modulation module 12 is connected to the optical engine module 11 and is configured to dynamically switch the polarization state of the imaging light by using an electro-optical modulator, and includes at least one of a liquid crystal polarization rotator, a Pockels cell or a metasurface polarization controller.

[0025] The in-coupling grating 13 is a common grating with polarization sensitivity, and is arranged on the light-in side of the waveguide body 14 and is configured to couple the imaging light into the waveguide body 14.

[0026] The waveguide body 14 is made of a transparent high refractive index material (such as glass, silicon carbide, resin, polymer) and is configured to transmit the imaging light that has entered through the in-coupling grating 13 in a total reflection manner, and no matter whether the light is P light or S light, the light will propagate in one direction in the waveguide until it is coupled out by the metasurface out-coupling grating.

[0027] The metasurface out-coupling grating 15 is arranged on the light-out side of the waveguide body 14 and is configured to couple out the imaging light at different exit angles according to the polarization state of the imaging light, thereby forming a position-adjustable virtual image.

[0028] The control module 16 is in communication connection with the polarization modulation module 12 and is configured to control the polarization modulation module 12 to switch the polarization state of the imaging light according to a user input signal such as a user's line of sight, an application scenario or a gesture instruction, so as to dynamically change the position of the virtual image. Specifically, the control module 16 switches the polarization state by an electrical signal, and the system can realize the switching of the virtual image between “directly in front”, “slightly to the right” and “slightly upwards” within milliseconds. Figure 2 As shown in FIG. 6, which is a schematic diagram of the control module provided in the embodiment for changing the position of the virtual image.

[0029] The device provided by the embodiment provides a core light signal basis for the whole AR display device by the light machine module 11 for generating imaging light with linear polarization or circular polarization characteristics. The output polarized light not only meets the optical characteristic requirements of subsequent polarization modulation, grating coupling and other links, ensures that the light signal has a controllable physical prerequisite, but also guarantees the intensity stability and beam quality of the imaging light. The polarization modulation module 12 is connected to the light machine module 11 and is used to dynamically switch the polarization state of the imaging light by using an electro-optic modulator. The limitation of fixed polarized light is broken, and the light signal is given controllable polarization characteristics. The switching process has fast response speed, accurate polarization state switching and strong stability, and can flexibly switch the linear polarization direction or convert between the positive and negative rotation directions of the circular polarization according to the instruction of the control module 16, thereby providing variable input conditions for the angle selection of the super surface coupling-out grating 15. The coupling-in grating 13 is arranged on the light-in side of the waveguide main body 14 and is used to couple the imaging light into the waveguide main body 14. The imaging light output by the light machine module 11 can be efficiently and directionally coupled into the waveguide main body 14. Through the grating structure design, the energy loss in the coupling process of the light signal can be minimized, and at the same time, the coupled imaging light can meet the angle requirements of the total reflection transmission of the waveguide main body 14. The waveguide main body 14 is used to transmit the imaging light entering through the coupling-in grating 13 in a total reflection manner. Through the total reflection mechanism, the imaging light can be transmitted in the waveguide without additional light path guidance, which not only simplifies the device structure, but also avoids the polarization state distortion and intensity attenuation of the light signal in the transmission process, thereby ensuring that the light signal still maintains accurate polarization characteristics and sufficient energy when reaching the super surface coupling-out grating 15, and providing stable transmission channel support for clear imaging and position adjustment of the virtual image. The super surface coupling-out grating 15 is arranged on the light-out side of the waveguide main body 14 and is used to couple out the imaging light at different exit angles according to the polarization state of the imaging light, thereby forming a position-adjustable virtual image. Through the directional response characteristics of the super surface structure to different polarization state light signals, the imaging light with a specific polarization state can be accurately coupled out of the waveguide main body 14 at a corresponding preset angle, thereby realizing dynamic switching of the spatial position of the virtual image. The grating structure design of the super surface coupling-out grating 15 guarantees the directionality and concentration of the coupled-out light, avoids distortion, ghosting and other problems of the virtual image, and ensures that the virtual images at different positions all have clear imaging quality, thereby directly realizing the core function of dynamic adjustment of the virtual image of the device. The control module 16 is in communication connection with the polarization modulation module 12 and is used to control the polarization modulation module 12 to switch the polarization state of the imaging light according to the user input signal. The control module 16 can quickly receive the user input signal and convert it into a precise control instruction to be transmitted to the polarization modulation module 12, thereby realizing polarization state switching and real-time matching with user demand. The control module 16 has the characteristics of clear control logic, low response delay and precise instruction execution, thereby providing a reliable control core for the dynamic adjustment of the virtual image of the whole device, ensuring that the user can conveniently and efficiently adjust the position of the virtual image as needed, and is a key guarantee for the human-computer interaction and function landing of the device.

[0030] In one embodiment, the in-coupling grating 13 diffracts S-polarized light and P-polarized light into the same propagation direction, ensuring that the light is transmitted in the same direction in the waveguide. Specifically, when S light enters, the front in-coupling grating responds to diffraction of the 1st order and is transmitted to the waveguide. When P light enters, the front in-coupling grating responds to diffraction of the 0th order, is first normally incident on the rear ordinary in-coupling grating, and then responds to diffraction of the 1st order and is transmitted to the waveguide.

[0031] The device provided in this embodiment can diffract S-polarized light and P-polarized light into the same direction, achieve same-direction transmission after being coupled into the waveguide, improve light utilization, avoid transmission disorder caused by polarization state difference, and lay a stable foundation for subsequent polarization regulation and accurate virtual image adjustment.

[0032] In one embodiment, the super surface out-coupling grating 15 includes anisotropic nano units, and the super surface out-coupling grating includes a rectangular nano column, an inclined grating, and a blazed grating. The anisotropic nano units are any one of a rectangular nano column, an elliptical nano column, or a nano groove. By adjusting the grating inclination angle, period, and height, and the long axis, short axis, and height parameters of the anisotropic nano units, the S-polarized light and the P-polarized light obtain different phase responses and out-coupling efficiencies.

[0033] The super surface out-coupling grating 15 is composed of a single-layer polarization-selective super surface grating, is not sensitive to polarization, corresponds to different exit angles for S-polarized light and P-polarized light, responds to P-polarized light to exit at an exit angle θ to make the virtual image deviate to the right, responds to S-polarized light to exit at an exit angle α to make the virtual image in front, and realizes position switching of the virtual image in the horizontal or vertical direction. Figure 3 As shown in the figure, the super surface out-coupling grating and the waveguide provided in this embodiment are schematic diagrams of the exit of S light and P light.

[0034] The device provided in this embodiment is based on a rectangular nano column, an elliptical nano column, or a nano groove type anisotropic nano unit, an inclined grating, and a blazed grating. The anisotropic nano units are any one of a rectangular nano column, an elliptical nano column, or a nano groove. By adjusting the grating inclination angle, period, and height, and the long axis, short axis, and height parameters of the anisotropic nano units, the S-polarized light and the P-polarized light obtain different phase responses and out-coupling efficiencies. The super surface grating design can make the two polarized lights correspond to different exit angles, accurately realize position switching of the virtual image in the horizontal or vertical direction, and simplify the device design by using a single-layer structure, thereby improving the functional reliability.

[0035] The polarization-selective super surface grating design method is further described as follows: Significantly different phase responses and out-coupling efficiencies are given to two orthogonal linear polarizations (TE / S and TM / P), so that the S-polarized light and the P-polarized light are coupled out at different angles or different intensity ratios.

[0036] Principle (how to achieve linear polarization selectivity): 1. Use anisotropic nano units, such as rectangular nanocolumns, elliptical nanocolumns or nanoslots, to make the units have different effective refractive indices (neff_x≠neff_y) and different resonance frequencies and phase responses for x and y orthogonal linear polarizations.

[0037] 2. Adjust the unit geometry (major axis / minor axis, aspect ratio, height) to control the phase difference and amplitude of the two polarizations, thereby achieving linear polarization selective coupling out (i.e., S polarization is strongly coupled out to θ1, and P polarization is attenuated or coupled out to θ2).

[0038] 3. Common implementation mechanism: use the phase gradient in the waveguide to make the two polarizations satisfy different coupling-out angles.

[0039] Method embodiment According to the embodiment of the application, an AR optical waveguide virtual image dynamic adjustment display method is provided, as shown in Figure 4 The flowchart of the AR optical waveguide virtual image dynamic adjustment display method provided by the embodiment is shown in the figure. According to the AR optical waveguide virtual image dynamic adjustment display method of the embodiment, the following steps are included: S401. Generate imaging light with linear or circular polarization characteristics through an optical mechanical module.

[0040] S402. Receive the imaging light emitted by the optical mechanical module through a polarization modulation module, and dynamically switch the polarization state of the imaging light using an electro-optic modulator.

[0041] S403. Couple the imaging light into the waveguide main body through a coupling-in grating arranged on the light-in side of the waveguide main body.

[0042] S404. Transmit the imaging light that has entered the waveguide main body through the coupling-in grating in a total reflection manner.

[0043] S405. According to the polarization state of the imaging light, couple it out at different exit angles through a metasurface coupling-out grating arranged on the light-out side of the waveguide main body, to form a position-adjustable virtual image.

[0044] S406. Control the polarization modulation module to switch the polarization state of the imaging light according to a user input signal through a control module in communication connection with the polarization modulation module.

[0045] The method provided by the embodiment provides a core light signal basis for the whole AR display device by generating imaging light with linear polarization or circular polarization characteristics, the output polarized light meets the optical characteristic requirements of subsequent polarization modulation, grating coupling and the like, ensures that the light signal has a controllable physical prerequisite, and also guarantees the intensity stability and beam quality of the imaging light; the polarization state of the imaging light is dynamically switched by using an electro-optic modulator, thereby breaking the limitation of fixed polarized light and giving the light signal controllable polarization characteristics, the switching process has fast response speed, accurate polarization state switching and strong stability, and can flexibly switch the linear polarization direction or convert between the positive and negative rotation directions of the circular polarization according to the instruction of the control module, thereby providing variable input conditions for the angle selection of the metasurface out-coupling grating; the imaging light is coupled into the waveguide main body, the imaging light output by the optical mechanical module can be efficiently and directionally coupled into the waveguide main body, the grating structure design can maximize the energy loss in the coupling process of the light signal, and also ensures that the coupled imaging light meets the angle requirement of the total reflection transmission of the waveguide main body; the imaging light entering the in-coupling grating is transmitted in a total reflection manner, through the total reflection mechanism, the imaging light can be transmitted for a long distance without additional light path guidance in the waveguide, which not only simplifies the device structure, but also avoids the polarization state distortion and intensity attenuation of the light signal in the transmission process, thereby ensuring that the light signal still maintains accurate polarization characteristics and sufficient energy when reaching the metasurface out-coupling grating, and providing stable transmission channel support for clear imaging and position adjustment of the virtual image; the imaging light is coupled out at different exit angles according to the polarization state, thereby forming a position-adjustable virtual image; through the directional response characteristics of the metasurface structure to different polarization state light signals, the imaging light with a specific polarization state can be accurately coupled out from the waveguide main body at a corresponding preset angle, thereby realizing dynamic switching of the spatial position of the virtual image, the grating structure design guarantees the directionality and concentration of the coupled-out light, avoids distortion, ghosting and other problems of the virtual image, and ensures that the virtual images at different positions all have clear imaging quality, thereby directly realizing the core function of dynamic adjustment of the virtual image of the device; the polarization state of the imaging light is switched by controlling the polarization modulation module according to the user input signal, the user input signal can be quickly received and converted into accurate control instructions transmitted to the polarization modulation module, thereby realizing polarization state switching and real-time matching with the user demand, having the characteristics of clear control logic, low response delay and accurate instruction execution, thereby providing a reliable control core for the dynamic adjustment of the virtual image of the whole device, and ensuring that the user can conveniently and efficiently adjust the position of the virtual image as needed, which is a key guarantee for the human-computer interaction and function landing of the device.

[0046] The embodiment of the present application is a method embodiment corresponding to the above-mentioned device embodiment, and the specific operation of each step can be understood with reference to the description of the device embodiment, which will not be repeated here.

[0047] As Figure 5As shown, the present invention also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the steps of the AR optical waveguide virtual image dynamic adjustment display device in the above embodiments, or when the computer program is executed by a processor, it implements the steps of the AR optical waveguide virtual image dynamic adjustment display method in the above embodiments.

[0048] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0049] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for apparatus or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The apparatus and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and the contents not described in detail in the specification of the present invention are known to those skilled in the art.

Claims

1. An AR optical waveguide virtual image dynamic adjustment display device, characterized in that, include: Optomechanical module, used to generate imaging light with linear or circular polarization characteristics; A polarization modulation module, connected to the optomechanical module, is used to dynamically switch the polarization state of the imaging light using an electro-optic modulator; A coupling grating is disposed on the light-incident side of the waveguide body to couple the imaging light into the waveguide body; A waveguide body for transmitting the imaging light entering through the coupling grating in a total internal reflection manner; A metasurface coupling grating is disposed on the light-emitting side of the waveguide body to couple out the imaging light at different emission angles according to the polarization state of the imaging light, thereby forming a virtual image with adjustable position. The control module is communicatively connected to the polarization modulation module and is used to control the polarization modulation module to switch the polarization state of the imaging light according to the user input signal.

2. The AR optical waveguide virtual image dynamic adjustment display device as described in claim 1, characterized in that, The polarization modulation module is an electro-optic modulator, including at least one of a liquid crystal polarization rotator, a Pockels unit, or a metasurface polarization modulator.

3. The AR optical waveguide virtual image dynamic adjustment display device as described in claim 1, characterized in that, The waveguide body is made of a transparent high-refractive-index material, which can be any one of glass, silicon carbide, resin or polymer.

4. The AR waveguide virtual image dynamic adjustment display device as described in claim 1, characterized in that, The metasurface coupling grating includes anisotropic nanounits, tilted gratings, and blazed gratings, wherein the anisotropic nanounits are any one of rectangular nanopillars, elliptical nanopillars, or nanogrooves; By adjusting the tilt angle, period, and height of the grating, the major axis, minor axis, and height parameters of the anisotropic nanounits can be adjusted to enable S-polarized light and P-polarized light to obtain different phase responses and coupling efficiencies.

5. The AR optical waveguide virtual image dynamic adjustment display device as described in claim 4, characterized in that, The metasurface coupling grating is composed of a single-layer polarization-selective metasurface grating, which corresponds to different emission angles for S-polarized light and P-polarized light, thereby enabling the virtual image to switch positions in the horizontal or vertical directions.

6. The AR optical waveguide virtual image dynamic adjustment display device as described in claim 1, characterized in that, The control module is configured to control the polarization modulation module to switch the polarization state of the imaging light according to the user's line of sight, application scenario, or gesture command, so as to realize the automatic adjustment of the virtual image position.

7. The AR optical waveguide virtual image dynamic adjustment display device as described in claim 1, characterized in that, The coupling grating diffracts S-polarized light and P-polarized light to the same propagation direction, ensuring that the light propagates in the same direction in the waveguide.

8. A method for dynamically adjusting and displaying an AR optical waveguide virtual image, characterized in that, Includes the following steps: Imaging light with linear or circular polarization characteristics is generated through an optomechanical module; The imaging light emitted from the optomechanical module is received by the polarization modulation module, and the polarization state of the imaging light is dynamically switched by the electro-optic modulator. The imaging light is coupled into the waveguide body by a coupling grating disposed on the light-incident side of the waveguide body; The imaging light entering through the coupling grating is transmitted via the waveguide body in a total internal reflection manner; By using a metasurface coupling grating set on the light-emitting side of the waveguide body, the imaging light is coupled out at different emission angles according to the polarization state, forming a virtual image with adjustable position; The control module, which is communicatively connected to the polarization modulation module, controls the polarization modulation module to switch the polarization state of the imaging light according to the user input signal.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the AR optical waveguide virtual image dynamic adjustment display method as described in claim 8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the AR optical waveguide virtual image dynamic adjustment display method as described in claim 8.

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