Wide field improved maxwell display system based on human eye vision characteristics

Abstract

The application provides a wide field of view improved Maxwell display system based on human eye visual characteristics. The system is composed of a laser projector, a collimating lens, an electrically controlled light modulation device, a short focal length focusing lens and a beam splitter. An image information containing light beam is projected by the laser projector and forms a parallel light beam by the collimating lens, and is incident to the electrically controlled light modulation device. When a voltage is applied, the electrically controlled light modulation device is in a transparent state, the parallel light beam directly passes through, the improved Maxwell display MMV channel works, the light beam converges through the short focal length focusing lens, and an image is clearly imaged on the foveal region of the human eye retina; when no voltage is applied, the device is in a scattering state, the incident light is modulated into a scattering light beam, the wide field of view imaging display WFID channel works, and the focusing lens images the light in a wide field of view on the peripheral region of the retina. The electrically controlled characteristics of the electrically controlled light modulation device realize the combination of the two channels, and the virtual and real fusion is completed through the beam splitter, so that the AR display of the clear foveal region and the wide field of view of the peripheral region is formed.

Description

Technical Field

[0001] This invention belongs to the field of augmented reality (AR) near-eye display technology, specifically relating to a wide field-of-view improved Maxwell display system based on the visual characteristics of the human eye, applicable to scenarios such as augmented reality glasses, head-mounted displays (HMDs), assistive vision devices, and intelligent driving cockpit displays. Background Technology

[0002] Augmented reality (AR) display technology provides users with an interactive visual experience that combines the virtual and real worlds by overlaying computer-generated virtual information onto the real world. As one of the core implementation paths of AR displays, near-eye displays (NEDs) are gradually becoming the mainstream solution for head-mounted AR devices due to their portability and compactness.

[0003] Among existing AR display technologies, Maxwell display, also known as retinal projection display, has attracted much attention due to its simple optical structure and ability to effectively alleviate the vergence-accommodation conflict (VAC). Its basic principle is to converge image light to the center of the human eye's pupil, allowing the image to be projected directly onto the retinal surface for clear imaging, regardless of the depth of focus of the human eye. However, traditional Maxwell displays have significant drawbacks: firstly, their extremely small eyebox limits the user's range of eye movement; secondly, existing eyebox expansion schemes, such as pupil turning or viewpoint replication, typically do not adequately consider the matching problem between the main ray and the human eye's visual axis. When the eye rotates, the imaging beam at the replicated viewpoint often deviates from the fovea region of the retina, resulting in blurred or lost images, a phenomenon known as "gaze mismatch," as shown in Figure 1. While improved Maxwell AR display schemes converge light to the center of the eye's rotation to solve the rotation problem, their field of view is usually limited by the pupil diameter, making it difficult to achieve a large field of view.

[0004] The human visual system possesses two key characteristics: first, the foveal-periphery specialization of the retina, meaning the fovea (within approximately ±5°) is sensitive to detail and has high resolution, while the peripheral region is sensitive to motion, offering a wide field of view but lower resolution; second, the gaze-matching characteristic during eye movements, meaning that during saccades and tracking movements, the eye's imaging system consistently projects the object being gazed upon, i.e., the region of interest (ROI) in the image, onto the fovea of ​​the retina. Current AR display systems lack a simple and effective solution to simultaneously satisfy both of these characteristics, making it difficult to balance a wide field of view, high resolution, and dynamic gaze-matching. Therefore, developing an AR display system that combines the physiological characteristics of the human eye, achieving both high-resolution foveal imaging and gaze-matching while also covering a wide peripheral field of view, is of significant research importance. Summary of the Invention

[0005] To address the problem that existing AR display systems cannot simultaneously satisfy the foveal-peripheral specialization characteristics of the human eye's retina and the eye movement gaze matching characteristics, this invention proposes a wide-field-of-view improved Maxwell display system based on the visual characteristics of the human eye.

[0006] The system features two display channels: a modified Maxwellian view (MMV) and a wide-field imaging display (WFID). The MMV channel converges parallel light rays to the center of rotation of the human eye, presenting a high-definition image of the fovea region of interest. The WFID channel images scattered light rays onto the far plane, achieving wide-field imaging in the peripheral region of the retina. The system comprises an image generation unit, an electro-optical modulator, a short-focal-length focusing lens, and a beam splitter. The image generation unit consists of a laser projector and a collimating lens. A beam containing the target image information is projected by the laser projector, collimated into a parallel beam by the collimating lens, and then incident on the electro-optical modulator carrying a high-frequency drive module. When a voltage is applied to the electro-optical modulator, it exhibits high light transmittance, allowing the parallel beam to pass through unobstructed. At this time, the MMV channel operates, and the parallel beam is converged to a single point by the short-focal-length focusing lens, clearly imaging the ROI image onto the fovea region of the human eye's retina. When no voltage is applied to the device, it exhibits a scattering state. The parallel beam is modulated to form a scattered beam. At this time, the WFID channel is active, and the short focal length focusing lens images the scattered light onto the peripheral area of ​​the retina with a wide field of view. Utilizing the electronic control characteristics of the electro-optic modulator, the incident beam can quickly switch between parallel and scattering states, thereby achieving an effective combination of the two display channels to form a time-division multiplexed virtual fused image. Finally, a beam splitter is used to fuse the virtual image with the real-world scene, creating an AR display on the retina with a clear foveal region and a wide field of view in the peripheral region.

[0007] The laser projector is used to provide a high-brightness, high-contrast image source. The image beam it generates has good directionality and coherence, which enables it to be efficiently coupled with subsequent optical systems, making it an ideal light source for realizing Maxwell's retinal projection.

[0008] The collimating lens is positioned in front of the optical path of the laser projector to collimate the diverging beam emitted by the laser projector into a parallel beam. The diameter of the collimated parallel beam should cover the effective working area of ​​the subsequent electro-optical modulation device to ensure efficient light energy utilization.

[0009] The electro-optical modulation device is the core component for merging the two display channels. Its optical transmission characteristics can be rapidly and reversibly controlled by an external electric field. When a voltage is applied, the device exhibits a highly transparent state with high light transmittance. In this state, the system operates in the MMV channel, and parallel beams pass through the device without obstruction. When no external electric field is applied, the device exhibits an opaque scattering state. In this state, the system operates in the WFID channel, and the parallel beams are modulated to form scattered beams.

[0010] Furthermore, by utilizing the electronic control characteristics of the electronically controlled optical modulation device, the rapid switching between the parallel and scattering states of the beam can be achieved, thereby combining the MMV and WFID channels.

[0011] Preferably, the system controls the switching state of the electro-optical modulation device through a high-frequency drive module to achieve fast time-division multiplexing of the MMV channel and the WFID channel, so that the human eye can perceive the seamless fusion of the two channel images.

[0012] The short focal length focusing lens is used to converge or image the light beam. Using a short focal length lens can achieve a large light deflection angle within a limited optical path distance, thereby significantly expanding the field of view in WFID channel mode and meeting the peripheral vision's need for a large field of view.

[0013] Furthermore, when a voltage is applied to the electro-optical modulation device and the MMV channel is working, the parallel beam passes through the device and is converged to a point by the short focal length focusing lens. This point is the viewing point, and the ROI image will be clearly imaged in the central concave region.

[0014] Preferably, unlike traditional Maxwell displays, this invention shifts the viewing point from the center of the pupil to the center of eye rotation, thus achieving an improved Maxwell display (MMV). When the eye rotates, the principal ray of the light beam entering the eye remains coaxial with the visual axis, ensuring that the image position of the beam is always located at the fovea of ​​the retina. Therefore, in the MMV channel, when the eye scans within the incident light range, the ROI image is always clearly projected onto the foveal region, maintaining the gaze-matching characteristic.

[0015] In MMV, since the light rays incident on the human eye are all fine rays, the human eye can observe a clear image within a relatively large depth of field (DOF). The system depth of field can be expressed by formula (1): (1) in, d This is the minimum perceptible blur threshold on the retina. u The distance from the lens of the human eye to the retina. The width of the light beam at the pupil.

[0016] Furthermore, when no voltage is applied to the electro-optical modulation device and the WFID display channel is operating, the incident light beam is modulated by the device to form a scattered light beam. The short focal length focusing lens images the scattered light beam, forming a magnified virtual image at a plane far from the human eye, thereby achieving wide field-of-view imaging in the peripheral area. The field of view angle θ can be expressed by formula (2): (2) in, S To magnify the size of the virtual image, The distance between the virtual image and the focusing lens. d This refers to the distance between the human eye and the focusing lens.

[0017] The beam splitter is positioned between the short focal length focusing lens and the human eye to reflect virtual image light into the human eye while transmitting real ambient light to achieve augmented reality display.

[0018] This invention proposes a wide-field-of-view improved Maxwell display system based on the characteristics of human vision. It employs a single display engine combined with an electro-optical modulation device, utilizing time-division multiplexing technology to achieve the fusion of dual-channel display modes. The system's MMV channel shifts the viewpoint to the center of human eye rotation, retaining the advantage of Maxwell displays without convergence-accommodation conflict while resolving issues such as ghosting, blind spots, and gaze mismatch in traditional eye-box expansion schemes. The WFID channel utilizes the scattering characteristics of the electro-optical modulation device to display a large field-of-view background image, compensating for the small field of view limitation of the improved Maxwell display. The system is compact and low-cost, simultaneously meeting the human eye's needs for high definition in the central field of view and wide perception at the edges, significantly improving the visual comfort and immersion of AR displays. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the imaging of a conventional Maxwell display (viewpoint at the center of the human pupil) during eye movement.

[0020] Figure 2 is a schematic diagram of the structure of the wide field-of-view improved Maxwell display system based on the visual characteristics of the human eye proposed in this invention.

[0021] Figure 3 is an experimental optical path setup diagram of a typical embodiment of the system of the present invention.

[0022] Figure 4 is a schematic diagram of the dual-channel time-division multiplexing fusion imaging system of the present invention.

[0023] Figure 5 is a schematic diagram of the improved Maxwell display (viewpoint at the center of human eye rotation) of the present invention during eye movement.

[0024] Figure 6 is a schematic diagram of the principle of PDLC used in a typical embodiment of the system of the present invention to control the optical transmission characteristics by applying an external electric field.

[0025] Figure 7 shows the gaze-matching imaging results of the MMV channel under different rotation angles of the system of the present invention.

[0026] Figure 8 shows the results of the improved Maxwell imaging captured by the system of the present invention at different depths.

[0027] Figure 9 shows the AR dual-channel fusion imaging results based on time-division multiplexing in different application scenarios of the system of the present invention.

[0028] As shown in the figure: 1-Center of human pupil, 2-Viewpoint, 3-Main ray, 4-Visual axis, 5-Follicular region of human retina, 6-Laser projector, 7-Collimating lens, 8-Electrically controlled light modulation device, 9-Short focal length focusing lens, 10-Beam splitter, 11-Center of rotation of human eye, 12-Camera, 13-High frequency drive module, 14-Time-division multiplexed virtual fused image, 15-Real-world scene, 16-Polymer matrix, 17-Liquid crystal molecule. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] This example constructs a wide-field-of-view improved Maxwell display system based on the visual characteristics of the human eye. The system has two display channels: MMV and WFID. The MMV channel converges parallel light rays to the rotation center 11 of the human eye, presenting a high-definition image in the fovea region 5 of the retina of interest. The WFID channel images scattered light rays onto the far plane, achieving wide-field-of-view imaging in the peripheral region of the retina. In terms of hardware connection and optical path arrangement, the system sequentially arranges an image generation unit, an electro-optical modulation device 8 carrying a high-frequency driving module 13, a short focal length focusing lens 9, and a beam splitter 10 along the optical path propagation direction. The image generation unit consists of a laser projector 6 and a collimating lens 7 located on its light-emitting side. The beam splitter 10 is located between the short focal length focusing lens 9 and the human eye, used to reflect the virtual optical path and transmit ambient light. Its structure is shown in Figures 2 and 3.

[0031] When the system is working, a beam containing target image information is projected by the laser projector 6, collimated into a parallel beam by the collimating lens 7, and then incident on the electro-optical modulator 8. When a voltage is applied to the electro-optical modulator 8, it exhibits high light transmittance, allowing the parallel beam to pass through unobstructed. At this time, the system operates in the MMV channel, and the parallel beam is converged to a point by the short focal length focusing lens 9. When no voltage is applied to the device, it exhibits a scattering state, and the parallel beam is modulated to form a scattered beam. At this time, the system operates in the WFID channel, and the short focal length focusing lens 9 images the scattered light with a wide field of view onto the peripheral area of ​​the retina. Utilizing the electro-optical modulator 8's electro-optical characteristics, the incident beam rapidly switches between parallel and scattering states, achieving an effective combination of the two display channels to form a time-division multiplexed virtual fused image 14, as shown in Figure 4. Finally, the time-division multiplexed virtual fused image 14 is reflected into the eye by the beam splitter 10, while simultaneously transmitting the real-world scene 15, realizing a virtual-real fusion AR display.

[0032] To meet the gaze matching requirements during eye movements, this example incorporates core optimizations to the optical design of the aforementioned MMV channel. As shown in Figure 5, this example shifts the convergence point (i.e., viewpoint 2) of the short focal length focusing lens 9 from the traditional pupil center 1 to the eye rotation center 11, thus achieving an improved Maxwell display (MMV). When the eye rotates, the principal ray 3 entering the eye remains coaxial with the visual axis 4, ensuring that the imaging position of the beam does not shift with eye rotation and remains stably located in the fovea region 5 of the retina. Therefore, in the MMV channel, when the eye scans within the incident light range, the ROI image can always be clearly projected onto the fovea region, perfectly maintaining the gaze matching characteristics.

[0033] In summary, this system uses a single display module combined with time-division multiplexing technology. While effectively reducing the system size, it creates an AR display on the human retina with a clear central foveal region and a wide field of view in the peripheral region. It also has the advantages of wide field of view, free focusing, high-definition imaging and gaze matching, which fully meets the needs of human eye physiological visual characteristics and dynamic eye movement.

[0034] In this example, a Ultimems HD301A1-H2 laser projector is selected as the image source. This type of projector is based on the laser scanning imaging principle, featuring high color gamut and high contrast, and its output beam itself has very little spread, making it very suitable for building retinal projection systems.

[0035] In this example, the collimating lens 7 has a focal length of 150mm and is placed 150mm away from the laser projector. Its function is to collimate the scanning beam emitted by the laser projector 6 into parallel light, ensuring that the angle of the light incident on the subsequent electro-optical modulation device 8 is consistent. This is the basis for ensuring the dual-channel switching effect.

[0036] In this example, the electro-optical modulation device 8 uses a custom-designed polymer-dispersed liquid crystal (PDLC) device from Sunwotech. PDLC, as a specific implementation of the electro-optical modulation device 8, is the core material for achieving the fusion of two display channels. It is a composite functional material formed by uniformly dispersing liquid crystal microdroplets in a polymer matrix 16. Its optical transmittance characteristics can be rapidly and reversibly controlled by an external electric field, as shown in Figure 6. When a voltage is applied across the PDLC film, the liquid crystal molecules 17 rearrange their orientation along the direction of the electric field, and their effective refractive index gradually approaches the refractive index of the polymer matrix 16, thereby significantly reducing the light scattering intensity. The device exhibits a highly transparent state with high light transmittance. When no external electric field is applied across the PDLC film, the liquid crystal molecules 17 are randomly oriented in the polymer matrix 16, and there is a significant refractive index mismatch between the liquid crystal microdroplets and the polymer. The incident light undergoes strong scattering at the incident interface, and the device as a whole exhibits an opaque scattering state. This device is placed 10 mm away from the collimating lens. To achieve smooth dynamic display, the PDLC is equipped with a high-frequency power drive module developed based on the MindMotionFTHR-G0001 chip. This drive module can control the PDLC to switch between transparent and scattering states with a millisecond-level response speed, and superimpose the MMV and WFID images in time to form a flicker-free continuous image.

[0037] In this example, the short focal length focusing lens 9 has a focal length of 75mm and is placed at a distance of 68.6mm from the PDLC device. The beam splitter 10 (splitting ratio 1:1, size 30mm) is located 10mm behind the focusing lens, used to transmit light from the real scene and reflect the light from the virtual image generated by the system, achieving AR overlay. In the experimental setup, to simulate the effect of human eye observation, a camera 12 is used to record images. Considering that the average distance between the cornea and the center of rotation of the human eye is approximately 13-15mm, this distance is set to 14mm in this example. Based on geometric optics calculations, the exit pupil distance of the system is designed to be 21mm, and the focal point of the focusing lens after reflection by the beam splitter 10 is precisely aligned to 14mm behind the optical center of the camera 12 lens (i.e., simulating the center of rotation of the eyeball).

[0038] Based on the above experimental setup, this embodiment tested and verified the display performance of the system.

[0039] In this example, the WFID channel, through the scattering effect of PDLC, can provide a diagonal extended field of view of about 50°, effectively covering the peripheral visual area of ​​the human eye, for displaying background or environmental auxiliary information; the MMV channel provides a central field of view of about 10°, which is sufficient to cover the high-sensitivity area of ​​the fovea region of the human eye 5 (±5°), for displaying key text or target details.

[0040] In this example, the rotation of the eyeball (from -10° to +10°) was simulated by rotating the camera 12. The experimental images showed that the image from the MMV channel was always stably imaged at the center of the field of view (corresponding to the fovea region 5 of the human eye retina), without the image shift or loss phenomenon in the traditional Maxwell display, as shown in Figure 7. This verifies the gaze matching advantage brought about by placing the viewpoint 2 at the rotation center 11 of the human eye.

[0041] In this example, the virtual image generated by the MMV channel remains sharp at different depths of focus from 300mm to 1900mm, unaffected by changes in the camera's focal length, as shown in Figure 8. This demonstrates that the system has a large depth of field and can effectively solve the VAC problem.

[0042] In this example, by utilizing time-division multiplexing technology, the system successfully simulated scenarios such as navigation, heart rate monitoring, and real-time translation. Key information (speed and heart rate values) is clearly presented in the center of the field of view through the MMV channel, while auxiliary icons are presented around the perimeter through the WFID channel. The two are seamlessly integrated without obvious splicing marks or artifacts, as shown in Figure 9.

[0043] This invention proposes a wide-field-of-view improved Maxwell display system based on the visual characteristics of the human eye. The system has two display channels: MMV and WFID. The MMV channel converges parallel light rays to the eye's rotation center 11, presenting a high-definition image in the fovea region 5 of the retina of interest. The WFID channel images scattered light rays onto the far plane, achieving wide-field-of-view imaging in the peripheral retina. By combining an improved Maxwell display with PDLC optical modulation through a single display engine, the system integrates wide-field-of-view imaging technology. At the hardware level, the system solves the contradiction between the field of view and the eye box in traditional AR displays, as well as the gaze mismatch problem during eye movement. It achieves non-uniform imaging across the entire field of view, highly conforming to the physiological characteristics of human vision, and provides an effective technical path for the development of next-generation high-performance augmented reality devices.

Claims

1. A wide-field-of-view improved Maxwell display system based on the characteristics of human visual perception, characterized in that, The system has two display channels: an improved Maxwell display and a wide field of view imaging display. The improved Maxwell display channel converges parallel light rays to the center of rotation of the human eye, presenting a clear image in the fovea region of the retina of interest. The wide field of view imaging display channel images scattered light rays on the far plane, achieving wide field of view imaging in the peripheral region of the retina. The system comprises an image generation unit, an electro-optical modulation device, a short-focal-length focusing lens, and a beam splitter. The image generation unit consists of a laser projector and a collimating lens. A beam containing target image information is projected by the laser projector, collimated into a parallel beam by the collimating lens, and then incident on the electro-optical modulation device. When a voltage is applied to the electro-optical modulation device, it becomes transparent, allowing the parallel beam to pass through unobstructed. At this time, the improved Maxwell display channel operates, and the parallel beam is converged to a point by the short-focal-length focusing lens, clearly imaging the region of interest onto the fovea region of the human eye's retina. When no voltage is applied to the device, it becomes scattering, and the parallel beam is modulated to form a scattered beam. At this time, the wide-field imaging display channel operates, and the short-focal-length focusing lens images the scattered light onto the peripheral region of the retina with a wide field of view. By utilizing the electronic control characteristics of the electro-optic modulator, the incident light beam is switched between parallel and scattering states, thereby achieving an effective combination of two display channels to form a time-division multiplexed virtual fused image. Finally, a beam splitter is used to fuse the virtual image with the real-world scene, creating an AR display on the retina with a clear foveal region and a wide field of view in the peripheral region.

2. The wide-field-of-view improved Maxwell display system based on human visual characteristics according to claim 1, characterized in that, The laser projector, placed at the front of the system, provides an image source. The image beam it generates is directional and coherent, which enables it to be efficiently coupled with the subsequent optical system, making it an ideal light source for realizing Maxwell's retinal projection.

3. The wide-field-of-view improved Maxwell display system based on human visual characteristics according to claim 1, characterized in that, The collimating lens is positioned in front of the optical path of the laser projector to collimate the diverging beam emitted by the laser projector into a parallel beam. The diameter of the collimated parallel beam covers the effective working area of ​​the subsequent electro-optical modulation device to ensure the utilization rate of light energy.

4. The wide-field-of-view improved Maxwell display system based on human visual characteristics according to claim 1, characterized in that, The electro-optical modulation device is positioned in front of the collimating lens's optical path. It is the core device for merging the two display channels. Its optical transmission characteristics are reversibly modulated by an external electric field. When a voltage is applied, the device becomes transparent, and the system operates in the improved Maxwell display channel, allowing parallel beams to pass through it without obstruction. When no external electric field is applied, the device becomes opaque and scatters, and the system operates in the wide field-of-view imaging display channel, where the parallel beams are modulated to form scattered beams.

5. The wide-field-of-view improved Maxwell display system based on human visual characteristics according to claim 1, characterized in that, By utilizing the electronic control characteristics of the electro-optic modulator, the system switches between the parallel and scattering states of the light beam, thereby combining the two channels of the improved Maxwell display and the wide field-of-view imaging display. The system controls the switching state of the electro-optic modulator through a high-frequency drive module, realizing time-division multiplexing of the improved Maxwell display channel and the wide field-of-view imaging display channel, so that the human eye perceives the seamless fusion of the two channel images.

6. The wide-field-of-view improved Maxwell display system based on human visual characteristics according to claim 1, characterized in that, The short focal length focusing lens is used to converge or image the light beam. By using the short focal length lens, the light deflection angle can be achieved within a limited optical path distance, thereby expanding the field of view in the wide field of view imaging display channel mode and meeting the peripheral vision's demand for a large field of view.

7. The wide-field-of-view improved Maxwell display system based on human visual characteristics according to claim 1, characterized in that, When a voltage is applied to the electro-optic modulator and the improved Maxwell display channel is in operation, the parallel beam of light passes through the device and is converged to a point by the short focal length focusing lens. This point is the viewing point, and the image of the region of interest will be clearly imaged on the fovea of ​​the human eye's retina. By moving the viewing point from the center of the pupil to the center of eye rotation, the improved Maxwell display is realized. When the eyeball rotates, the principal ray of the beam entering the eye always remains coaxial with the visual axis, so that the imaging position of the beam is always located in the fovea of ​​the human eye's retina. Therefore, under the improved Maxwell display channel, when the human eye scans within the incident light range, the image of the region of interest is always clearly projected onto the fovea of ​​the human eye's retina, maintaining the gaze matching characteristic. In the improved Maxwell display, since the light incident on the human eye is all fine light, the human eye observes a clear image within the depth of field. The system depth of field can be expressed by formula (1): (1) Where δ is the minimum perceptible blur threshold on the retina, and υ is the distance from the lens of the human eye to the retina. The width of the light beam at the pupil.

8. The wide-field-of-view improved Maxwell display system based on human visual characteristics according to claim 1, characterized in that, When the electro-optical modulation device is not subjected to voltage, and the wide field-of-view imaging display channel is operating, the incident light beam is modulated by the device to form a scattered light beam. The short focal length focusing lens images the scattered light, forming a magnified virtual image at the far plane of the human eye, thereby achieving wide field-of-view imaging in the peripheral area. θ It can be expressed by formula (2): (2) in, S To magnify the size of the virtual image, The distance between the virtual image and the focusing lens. d This refers to the distance between the human eye and the focusing lens.

9. The wide-field-of-view improved Maxwell display system based on human visual characteristics according to claim 1, characterized in that, The beam splitter is positioned between the short focal length focusing lens and the human eye to reflect virtual image light into the human eye while transmitting real ambient light to achieve augmented reality display.

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