Near-eye display system, display method, and virtual reality device

Abstract

The application provides a near-eye display system, a display method and a virtual reality device. The near-eye display system comprises a projection device, a semi-transparent screen and a micro-mirror array. The semi-transparent screen is arranged opposite to the projection device. The micro-mirror array is arranged on the side of the semi-transparent screen away from the projection device. The projection device is used for projecting a light beam to the semi-transparent screen to form a micro-unit image. The image unit of the micro-unit image corresponds to the micro-mirror unit of the micro-mirror array one by one. The micro-mirror array is used for reflecting the light beam passing through the semi-transparent screen, so that the light beam enters the eye and reconstructs a three-dimensional image. The near-eye display system, the display method and the virtual reality device provided by the application have the advantages of simple structure, convenient use, effective avoidance of vergence-accommodation conflict, reduction of discomfort and dizziness of users, improvement of imaging quality and viewing angle, and good user experience.

Description

Near-eye display systems, display methods and virtual reality devices Technical Field

[0001] This application relates to the field of display technology, and in particular to a near-eye display system, display method and virtual reality device. Background Technology

[0002] Near-eye display systems, also known as helmet-mounted displays, use a screen to display images that emit light into the eyes. The left and right eyes receive different information and use this difference to create a stereoscopic visual effect in the mind. With the rapid development of virtual reality technology, this system has been widely used in immersive virtual reality and augmented reality technologies. However, near-eye display systems suffer from convergence-accommodation conflict when displaying stereoscopic scenes, which can increase user discomfort and dizziness. Therefore, there is an urgent need for a near-eye display system that can avoid convergence-accommodation conflict. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a near-eye display system, display method and virtual reality device.

[0004] A first aspect of this application provides a near-eye display system, comprising: a projection device, a semi-transparent screen, and a micro-mirror array, wherein the semi-transparent screen is disposed opposite to the projection device, and the micro-mirror array is disposed on the side of the semi-transparent screen away from the projection device; the projection device is used to project a light beam onto the semi-transparent screen to form a micro-unit image, wherein the image units of the micro-unit image correspond one-to-one with the micro-mirror units of the micro-mirror array, and the micro-mirror array is used to reflect the light beam passing through the semi-transparent screen so that the light beam enters the eye and reconstructs a three-dimensional image.

[0005] In some embodiments, an intermediate medium layer is provided between the micromirror array and the semi-transparent screen, the intermediate medium layer being used to support the micromirror array.

[0006] In some embodiments, the micromirror unit size of the micromirror array is P. lens And 2≤ Where Φ is the diameter of the user's pupil, and P pixel Let be the image unit size of the micro-unit image, Le be the distance between the user's eye and the micro-mirror array, n be the refractive index of the intermediate medium layer, and g be the distance between the micro-mirror array and the semi-transparent screen.

[0007] In some embodiments, the refractive index of the intermediate medium layer is greater than or equal to 1.5, and the distance between the user's eye and the micromirror array is greater than or equal to 100 mm.

[0008] In some embodiments, the micromirror array is a microconvex mirror array or a microconcave mirror array; the number of micromirror arrays is two, and they are respectively set at intervals corresponding to the user's left and right eyes.

[0009] In some embodiments, the projection device includes a projector and a relay lens, the projector being used to project a light beam and the relay lens being used to homogenize the light beam; the projection device is of one type and is connected to a driving device, the driving device being used to drive the projection device to reciprocate between the left-eye corresponding area and the right-eye corresponding area facing the translucent screen.

[0010] A second aspect of this application provides a display method using the near-eye display system described in the first aspect above, the display method comprising: controlling the projection device to project a first image beam and a second image beam onto the translucent screen, wherein the first image beam is for viewing by the user's left eye and the second image beam is for viewing by the user's right eye.

[0011] In some embodiments, the projection device is one in number and is connected to a driving device, the driving device being used to drive the projection device to reciprocate between the left-eye corresponding region and the right-eye corresponding region facing the semi-transparent screen; controlling the projection device to project a first image beam and a second image beam onto the semi-transparent screen includes: obtaining the orientation of the projection device; in response to determining that the projection device is facing the left-eye corresponding region, controlling the projection device to project the first image beam; in response to determining that the projection device is facing the right-eye corresponding region, controlling the projection device to project the second image beam.

[0012] In some embodiments, the switching frequency of the projection device for projecting the first image beam and the second image beam is greater than or equal to 120Hz.

[0013] A third aspect of this application provides a virtual reality device, including the near-eye display system described in the first aspect above.

[0014] As can be seen from the above description, this application provides a near-eye display system, display method, and virtual reality device. It uses a projection device to project a light beam onto a semi-transparent screen to form a micro-unit image. The semi-transparent screen acts as a display screen, carrying the micro-unit image and allowing the projected light beam to pass through and illuminate a micro-mirror array. The micro-mirror array reflects the light beam passing through the semi-transparent screen, allowing the reflected beams in different directions to enter the eye and reconstruct a three-dimensional image. The reconstructed three-dimensional image is located in front of the projection device, effectively changing the focusing position of the human eye. This allows the human eye to monocularly focus on the reconstructed three-dimensional image, thus enabling monocular focusing. The focusing distance and convergence distance are the same, meaning the focusing distance and convergence distance are equal, thus avoiding convergence-accommodation conflict and reducing user discomfort and dizziness. The image units of the micro-unit image correspond one-to-one with the micro-mirror units of the micro-mirror array, ensuring a complete image. Using a micro-mirror array instead of the lens array in related technologies avoids light diffraction, improving image clarity and viewing angle, and enhancing the user experience. This near-eye display system, display method, and virtual reality device are simple in structure, easy to use, effectively avoid convergence-accommodation conflict, reduce user discomfort and dizziness, improve image quality and viewing angle, and provide a good user experience. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 is a schematic diagram of the principle of convergence conflict;

[0017] Figure 2 is a schematic diagram of the structure of a near-eye display system in related technologies;

[0018] Figure 3 is a schematic diagram of a near-eye display system according to an embodiment of this application;

[0019] Figure 4 is a schematic diagram of another near-eye display system in an embodiment of this application.

[0020] Reference numerals: 1. Projection device; 1-1. Projector; 1-2. Relay lens; 1-3. Driving device; 2. Semi-transparent screen; 3. Micro-mirror array; 3-1. Focal plane; 3-2. Three-dimensional image; 4. Intermediate medium layer; 5. Eye; 6. Display screen; 7. Lens array. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Virtual Reality (VR) is a computer simulation system that creates and allows users to experience virtual worlds. It uses computers to generate a simulated environment, immersing users in this environment through interactive, three-dimensional dynamic visuals and simulations of physical behaviors, providing a sensory experience that surpasses real-life environments. Visually, VR technology uses computer equipment to generate images of virtual scenes and transmits these images to the human eye through optical devices, allowing users to fully perceive the virtual scene.

[0024] Near-eye VR display systems, also known as head-mounted displays, as shown in Figure 2, use a display screen 6 to show images and emit light. The light is then focused into the eyes through a lens array 7. The left and right eyes receive different information and use this difference to create a stereoscopic visual experience in the mind. With the rapid development of virtual reality technology, this system has been widely used in both immersive virtual reality and augmented reality technologies. However, near-eye display systems have a convergence-accommodation conflict problem when displaying stereoscopic scenes, which can increase the user's discomfort and dizziness.

[0025] Our eyes (5) possess convergence and focusing functions. Convergence is the process by which the two eyeballs adjust the position of two objects by rotating inward or outward, allowing the brain to synthesize the two images into a single image. Focusing is the automatic adjustment of the focal length of the eyes based on the distance of objects, ensuring that the image of the object falls clearly on the retina, allowing us to see the world clearly. Under normal circumstances, when we look at objects in the real world, the convergence and focusing functions of the eyes (5) are coordinated. Convergence allows both eyes to focus on the same object, and focusing ensures that each eye (5) focuses on the object at the same distance. However, when viewing a 3D image (3-2) on a display system, as shown in Figure 1, where L1 is the convergence distance and L2 is the focusing distance, the positions of focusing and convergence become separated. This creates a convergence-accommodation conflict, forcing the brain to synthesize information that the line of sight and the focal point are not in the same position. This can cause confusion in the brain, and over time, it can lead to adverse reactions such as eye strain, dizziness, and headaches.

[0026] Furthermore, in the related technology, because the lens array 7 is used, diffraction will occur due to the limitation of the lens aperture, which will cause the light to be broadened to a certain extent, increase the size of the reconstructed image spot, and result in a smaller viewing angle and reduced clarity of the formed image.

[0027] Therefore, there is an urgent need for a near-eye display system that can avoid convergence-accommodation conflict and improve image quality.

[0028] The technical solution of this application will be described in detail below through specific embodiments and in conjunction with Figures 3 and 4.

[0029] Some embodiments of this application provide a near-eye display system, as shown in Figures 3 and 4, including: a projection device 1, a semi-transparent screen 2, and a micro mirror array 3. The semi-transparent screen 2 is disposed opposite to the projection device 1, and the micro mirror array 3 is disposed on the side of the semi-transparent screen 2 away from the projection device 1. The projection device 1 is used to project a light beam onto the semi-transparent screen 2 to form projectelemental images. The image units of the micro-unit images correspond one-to-one with the micro-mirror units of the micro mirror array 3. The micro mirror array 3 is used to reflect the light beam passing through the semi-transparent screen 2 so that the light beam enters the eye and reconstructs three-dimensional images 3-2 (3-D orthoscopic images).

[0030] The projection device 1 may include, for example, a projector 1-1, etc., and is not specifically limited. The projection device 1 is used to project a light beam onto the semi-transparent screen 2 to form a micro-unit image.

[0031] The semi-transparent screen 2, for example, is a plurality of diffusers with tiny particles, which can prevent glare and provide a comfortable visual environment. By setting the semi-transparent screen 2, it plays the role of the display screen 6 in the related technology, which is used to carry micro-unit images and allow the projected light beam to pass through the semi-transparent screen 2 and illuminate the micro-mirror array 3.

[0032] The micro-mirror array 3 is composed of multiple micro-mirror units arranged in an array. It can reflect light from different directions and adjust the light. By setting up the micro-mirror array 3, it is used to reflect the light beam passing through the semi-transparent screen 2, so that the reflected light beams from different directions enter the eye and reconstruct a three-dimensional image 3-2. The reconstructed three-dimensional image 3-2 is located in front of the projection device 1, which is equivalent to changing the focusing position of the human eye. In this way, the human eye can focus on the reconstructed three-dimensional image 3-2 with one eye. The monocular focusing distance and the binocular focusing distance of the human eye are the same, that is, the focusing distance and the convergence distance are equal. The focusing and convergence are in the same position, thereby avoiding the problem of convergence adjustment conflict and reducing the user's discomfort and dizziness.

[0033] As shown in Figure 3, the micro-mirror array 3 is a micro-convex mirror array. The light beam passing through the semi-transparent screen 2 is reflected into the eye by the micro-convex mirror unit. The backward extensions of the reflected light beams converge to form a reconstructed three-dimensional virtual image. The three-dimensional virtual image is located in the space behind the micro-convex mirror array. The focusing distance and convergence distance are both equal to the distance from the user's eye 5 to the three-dimensional virtual image. In the figure, the focal plane 3-1 is the plane formed by the imaging points closest to the semi-transparent screen 2 among the many imaging points reconstructed by the reflected light beam. The three-dimensional virtual image is located on the focal plane 3-1 and in the space behind it.

[0034] As shown in Figure 4, the micro mirror array 3 is a micro concave mirror array. The light beam passing through the semi-transparent screen 2 is reflected on the micro concave mirror unit. The reflected light beam converges to form a reconstructed three-dimensional real image and then enters the eye. The three-dimensional real image is located in the space in front of the micro concave mirror array. The focusing distance and the convergence distance are both equal to the distance from the user's eye 5 to the three-dimensional real image.

[0035] The image units of the micro-unit image are configured to correspond one-to-one with the micro-mirror units of the micro-mirror array 3. Each micro-mirror unit reflects the light of the corresponding image unit to ensure the integrity of the image.

[0036] In related technologies, due to the use of lens array 7, diffraction occurs due to the limitation of the lens unit aperture. The diffraction angle θ = λ / P lens’ Where λ is the wavelength of the projected beam, typically taken as 555 nm, and Plens’ The lens unit size is determined by the diffraction, which causes the light to broaden to a certain extent, increasing the size of the reconstructed image spot and reducing the clarity of the formed image. However, this solution uses a micro-mirror array 3 instead of the lens array 7 in the related technology. By using reflected beam imaging, the light diffraction phenomenon can be avoided, reducing the impact on the reconstructed light spot. The size of the reconstructed light spot is reduced, thereby improving the resolution of the three-dimensional image 3-2.

[0037] The size of the reconstructed light spot PI = n*(Le-Lc)*P pixel / g+2(Le-Lc)*λ / P lens , where P lens For the micromirror unit size, P pixel Let be the image unit size, Le be the distance between the user's eye 5 and the micromirror array 3, n be the refractive index of the intermediate medium layer 4, g be the distance between the micromirror array 3 and the semi-transparent screen 2, and Lc be the distance from the eye 5 to the reconstructed three-dimensional image 3-2.

[0038] From the above formulas, it can be seen that, while ensuring the same resolution as using lens array 7, the distance between the micro-mirror array 3 and the semi-transparent screen 2 in this scheme is lower, that is, the value of g is reduced, while the viewing angle Ω = 2arctan(P) lens / g), then this solution can achieve a wider viewing angle compared to using lens array 7, thereby improving the user experience.

[0039] This near-eye display system has a simple structure and is easy to use. It effectively avoids convergence and accommodation conflicts, reduces user discomfort and dizziness, improves image quality and viewing angle, and provides a good user experience.

[0040] In some embodiments, as shown in Figures 3 and 4, an intermediate medium layer 4 is provided between the micro-mirror array 3 and the semi-transparent screen 2, and the intermediate medium layer 4 is used to support the micro-mirror array 3.

[0041] The intermediate dielectric layer 4 is, for example, a glass layer, etc., and is not specifically limited. The intermediate dielectric layer 4 is set to support and fix the micro-mirror array 3.

[0042] In some embodiments, the micromirror unit size of the micromirror array 3 is P. lens And 2≤ Where Φ is the pupil diameter of the user's eye 5, P pixel Let be the image unit size of the micro-unit image, Le be the distance between the user's eye 5 and the micro-mirror array 3, n be the refractive index of the intermediate medium layer 4, and g be the distance between the micro-mirror array 3 and the translucent screen 2.

[0043] The pupil diameter Φ is typically 3mm to 5mm, and the image unit size P pixel The distance Le between the user's eye 5 and the micro-mirror array 3, the refractive index n of the intermediate medium layer 4, and the distance g between the micro-mirror array 3 and the semi-transparent screen 2 can be set according to different usage scenarios. Among them, Le and g satisfy 1 / Le+1 / g=1 / F, where F is the focal length of the micro-mirror unit.

[0044] By setting the micromirror unit size P lens satisfy It can be ensured that at least two beams of light reflected into the eye can reconstruct a three-dimensional image 3-2, that is, that at least two reflected beams can converge into image points of a three-dimensional real image, or at least two backward extensions of reflected beams can converge into image points of a three-dimensional virtual image. In this way, the human eye can focus on the image points reconstructed in space, thereby solving the convergence conflict problem.

[0045] In some embodiments, the refractive index of the intermediate medium layer 4 is greater than or equal to 1.5, and the distance between the user's eye 5 and the micromirror array 3 is greater than or equal to 100 mm.

[0046] Setting the refractive index of the intermediate medium layer 4 to ≥1.5 can prevent beam scattering and ensure display effect; setting the distance between the user's eye 5 and the micro-mirror array 3 to ≥100mm can improve the user's viewing experience.

[0047] In some embodiments, as shown in Figures 3 and 4, the micro-mirror array 3 is a micro-convex mirror array or a micro-concave mirror array; the number of micro-mirror arrays 3 is two, and they are respectively set at intervals corresponding to the user's left and right eyes.

[0048] The micro-mirror array 3 can be a micro-convex mirror array or a micro-concave mirror array; there is no specific limitation, and the choice can be made according to different application scenarios.

[0049] As shown in Figure 3, the micro-mirror array 3 is a micro-convex mirror array. The light beam passing through the semi-transparent screen 2 is reflected into the eye by the micro-convex mirror unit. The backward extensions of the reflected light beam converge to form a reconstructed three-dimensional virtual image. The three-dimensional virtual image is located in the space behind the semi-transparent screen 2. The focal plane 3-1 is located in the space behind the micro-convex mirror array. The distance from the human eye to the semi-transparent screen 2 is relatively close.

[0050] As shown in Figure 4, the micro mirror array 3 is a micro concave mirror array. The light beam passing through the semi-transparent screen 2 is reflected on the micro concave mirror unit. The reflected light beam converges to form a reconstructed three-dimensional real image (3-D orthoscopic real image) and then enters the eye. The three-dimensional real image is located in the space in front of the semi-transparent screen 2. The focal plane 3-1 is located in the space in front of the micro concave mirror array. The distance from the human eye to the semi-transparent screen 2 is relatively far.

[0051] Two micro-mirror arrays 3 are set up at intervals, corresponding to the user's left and right eyes respectively. Compared with setting up only one micro-mirror array 3 to correspond to the user's left and right eyes, this can effectively reduce the size of the micro-mirror array 3, reduce the processing difficulty, and reduce the production cost. The distance between the two micro-mirror arrays 3 is about the same as the width of the user's nose, and the specific distance is not limited.

[0052] In some embodiments, there are two projection devices 1, one of which is set to the left eye area of ​​the semi-transparent screen 2 and the other is set to the right eye area of ​​the semi-transparent screen 2. In this way, the left projection device 1 can project a beam of light for the user's left eye to view, while the right projection device 1 can project a beam of light for the user's right eye to view, thereby giving the user a stereoscopic visual experience.

[0053] In some embodiments, as shown in Figures 3 and 4, the projection device 1 includes a projector 1-1 and a relay lens 1-2. The projector 1-1 is used to project a light beam, and the relay lens 1-2 is used to homogenize the light beam. There is only one projection device 1, which is connected to a driving device 1-3. The driving device 1-3 is used to drive the projection device 1 to reciprocate between the left eye corresponding area and the right eye corresponding area facing the translucent screen 2.

[0054] Projector 1-1 is, for example, a laser projector, and is configured to project a beam of light for projecting micro-unit images.

[0055] The relay lens 1-2 is usually composed of two sets of lenses installed in the lens barrel. The lenses can be ordinary spherical lenses or aspherical lenses. The relay lens 1-2 is set up to homogenize the beam.

[0056] The drive device 1-3 is, for example, a mechanical steering component. By connecting the drive device 1-3 to the projection device 1, the projection device 1 can be driven to reciprocate between the left-eye and right-eye corresponding areas facing the semi-transparent screen 2. In this way, a single projection device 1 can alternately project a light beam for the user's left eye and a light beam for the user's right eye onto the semi-transparent screen 2, reducing the space occupied by setting up multiple projection devices 1 and greatly reducing production costs.

[0057] In some implementations, as shown in Figures 3 and 4, the projection of the projection device 1 onto the user's visual plane is located between the user's two eyes, for example, at the center of the line connecting the two eyes, so that the projection device 1 projects the first image beam and the second image beam at the same angle, thus ensuring the imaging effect.

[0058] Some embodiments of this application provide a virtual reality device, including the near-eye display system as described in any of the above embodiments.

[0059] The virtual reality device produces the same effect as the near-eye display system described above, so it will not be described in detail here.

[0060] In some embodiments, the virtual reality device is an external virtual reality device, including the near-eye display system and data processing unit described in the above embodiments. The data processing unit is connected to the near-eye display system via a data cable, and processes a large amount of data before sending it to the near-eye display system for display. This results in faster processing speed and higher playback quality.

[0061] In some embodiments, the virtual reality device is an all-in-one virtual reality device, including the near-eye display system and data processing unit described in the above embodiments. The data processing unit is located inside the near-eye display system, which eliminates the limitation of external data cables and makes it easy to carry.

[0062] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0063] In the embodiments of this application, "film" and "layer" can be interchanged. For example, sometimes "conductive layer" can be replaced with "conductive film". Similarly, sometimes "insulating film" can be replaced with "insulating layer". The scale of the drawings in the embodiments of this application can be used as a reference in actual processes, but is not limited thereto. For example, the aspect ratio of the channel, the thickness and spacing of each film layer can be adjusted according to actual needs. The number of pixels in the display panel and the number of sub-pixels in each pixel are not limited to the quantities shown in the figures. The drawings described in the embodiments of this application are only structural schematic diagrams, and one method in the embodiments of this application is not limited to the shapes or values ​​shown in the drawings.

[0064] In the embodiments of this application, triangles, rectangles, trapezoids, pentagons, or hexagons are not strictly defined, but can be approximate triangles, rectangles, trapezoids, pentagons, or hexagons, etc., and may have some small deformations due to tolerances, and may have chamfers, curved edges, and other deformations.

[0065] Furthermore, given that details have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that embodiments of this application may be practiced without these details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0066] Some embodiments of this application provide a display method using any of the near-eye display systems described above, including:

[0067] S1. Control the projection device 1 to project a first image beam and a second image beam onto the semi-transparent screen 2. The first image beam is used for viewing by the user's left eye, and the second image beam is used for viewing by the user's right eye.

[0068] The beams of light that project different images provide the basis for generating a stereoscopic visual sense in the mind; the reflected beams of light enter the eye and reconstruct a three-dimensional image 3-2. The reconstructed three-dimensional image 3-2 is located in front of the projection device 1, which is equivalent to changing the focusing position of the human eye. In this way, the human eye can focus monocularly on the reconstructed three-dimensional image 3-2, thereby avoiding the problem of convergence-accommodation conflict.

[0069] The first image beam passes through the semi-transparent screen 2, is reflected by the micro-mirror array 3 to the user's left eye, and reconstructs a three-dimensional image 3-2 for the left eye; the second image beam passes through the semi-transparent screen 2, is reflected by the micro-mirror array 3 to the user's right eye, and reconstructs a three-dimensional image 3-2 for the right eye. The human eye merges the three-dimensional image 3-2 of the left eye and the three-dimensional image 3-2 of the right eye to form a complete and three-dimensional image 3-2, thus achieving a true three-dimensional viewing experience.

[0070] In some embodiments, the projection device 1 is a single device connected to a driving device 1-3, the driving device 1-3 being used to drive the projection device 1 to reciprocate between the left-eye corresponding area and the right-eye corresponding area facing the translucent screen 2; controlling the projection device 1 to project a first image beam and a second image beam onto the translucent screen 2 includes:

[0071] S101. Obtain the orientation of the projection device 1.

[0072] S102. In response to determining that the projection device 1 is oriented toward the area corresponding to the left eye, the projection device 1 is controlled to project the first image beam.

[0073] S103. In response to determining that the projection device 1 is oriented toward the area corresponding to the right eye, the projection device 1 is controlled to project the second image beam.

[0074] The orientation of the projection device 1 can be determined based on the rotation angle of the projection device 1. For example, when the rotation angle is set to -30°, the orientation is determined to be the area corresponding to the left eye, and when the rotation angle is +30°, the orientation is determined to be the area corresponding to the right eye. This will not be elaborated here.

[0075] The driving device 1-3 drives the projection device 1 to reciprocate between the left eye corresponding area and the right eye corresponding area facing the semi-transparent screen 2. In this way, the first image beam and the second image beam can be alternately projected onto the semi-transparent screen 2 using a single projection device 1, which reduces the space occupied and improves work efficiency.

[0076] As shown in Figures 3 and 4, the solid line in the figure represents the projection device 1 facing the area corresponding to the left eye, at time T1, when the projection device 1 outputs the first image beam; the dashed line in the figure represents the projection device 1 facing the area corresponding to the right eye, at time T2, when the projection device 1 outputs the second image beam. By utilizing the persistence of vision of the human eye, the three-dimensional images 3-2 of the left and right eyes at different times are fused to produce a stereoscopic visual effect. Furthermore, the display pixels of the projection device 1 are reused in time, thereby improving the resolution of the currently reconstructed three-dimensional image 3-2 and improving the clarity of the spatial imaging.

[0077] In some embodiments, the switching frequency of the projection device 1 for projecting the first image beam and the second image beam is greater than or equal to 120Hz.

[0078] Set the output beam switching frequency to ≥120Hz, that is, set the interval between switching between the left eye 3D image 3-2 and the right eye 3D image 3-2 to ≤8.3ms. This ensures that a stereoscopic visual experience can be generated in the mind, and the picture is clear and smooth, improving the user experience.

[0079] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0080] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this application, well-known power / ground connections to other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be illustrated in block diagram form to avoid obscuring the embodiments of this application, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this application will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that the embodiments of this application may be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0081] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. The embodiments of this application are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A near-eye display system, characterized in that, include: The system comprises a projection device, a semi-transparent screen, and a micro-mirror array. The semi-transparent screen is positioned opposite the projection device, and the micro-mirror array is positioned on the side of the semi-transparent screen away from the projection device. The projection device projects a light beam onto the semi-transparent screen to form a micro-unit image. The image units of the micro-unit image correspond one-to-one with the micro-mirror units of the micro-mirror array. The micro-mirror array reflects the light beam passing through the semi-transparent screen so that the light beam enters the eye and reconstructs a three-dimensional image. An intermediate medium layer is provided between the micro-mirror array and the semi-transparent screen to support the micro-mirror array. The micromirror unit size of the micromirror array is ,and ;in, The diameter of the user's pupil. The image unit size of the micro-unit image is... The distance between the user's eye and the micro-mirror array. The refractive index of the intermediate dielectric layer is... The distance between the micro-mirror array and the semi-transparent screen is denoted as .

2. The near-eye display system according to claim 1, characterized in that, The refractive index of the intermediate medium layer is greater than or equal to 1.5, and the distance between the user's eye and the micro-mirror array is greater than or equal to 100 mm.

3. The near-eye display system according to claim 1, characterized in that, The micro-mirror array is either a micro-convex mirror array or a micro-concave mirror array; there are two micro-mirror arrays, and they are set at intervals corresponding to the user's left and right eyes, respectively.

4. The near-eye display system according to claim 1, characterized in that, The projection device includes a projector and a relay lens. The projector is used to project a light beam, and the relay lens is used to homogenize the light beam. There is one projection device, which is connected to a driving device. The driving device is used to drive the projection device to reciprocate between the left-eye corresponding area and the right-eye corresponding area facing the semi-transparent screen.

5. A display method, characterized in that, Using the near-eye display system as described in any one of claims 1-4, the display method includes: controlling the projection device to project a first image beam and a second image beam onto the semi-transparent screen, wherein the first image beam is for viewing by the user's left eye and the second image beam is for viewing by the user's right eye.

6. The display method according to claim 5, characterized in that, The projection device is one in number and is connected to a driving device. The driving device is used to drive the projection device to reciprocate between the left eye corresponding area and the right eye corresponding area facing the semi-transparent screen. The method of controlling the projection device to project a first image beam and a second image beam onto the semi-transparent screen includes: obtaining the orientation of the projection device; in response to determining that the projection device is oriented towards the area corresponding to the left eye, controlling the projection device to project the first image beam; and in response to determining that the projection device is oriented towards the area corresponding to the right eye, controlling the projection device to project the second image beam.

7. The display method according to claim 6, characterized in that, The switching frequency between the first image beam and the second image beam projected by the projection device is greater than or equal to 120Hz.

8. A virtual reality device, characterized in that, Including the near-eye display system as described in any one of claims 1-4.

Images