Optical field display apparatus and augmented reality display device

Abstract

An optical field display apparatus (200) and an augmented reality display device (100), relating to the technical field of display devices. The optical field display apparatus (200) comprises an image apparatus (210) and an optical fusion device (220). The image apparatus (210) is configured to sequentially generate a plurality of virtual images at different viewing angles within a single cycle, the image apparatus (210) comprises an imaging element (10) and a plurality of light sources (20), all the light sources (20) sequentially emit light within a single cycle, any two light sources (20) do not emit light at the same time within a single cycle, the imaging element (10) modulates imaging light beams on the basis of light beams emitted by the light sources (20), and the plurality of imaging light beams generated within a single cycle are configured to sequentially form a plurality of virtual images at different viewing angles. The optical fusion device (220) sequentially projects, to human eyes, all the imaging light beams generated by the image apparatus (210) within a single cycle, and is configured to project ambient light beams to the human eyes, thereby achieving optical field display, and solving a vergence-accommodation conflict.

Description

Light field display device and augmented reality display device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 29, 2024, with application number 202410384951.7 and application name “Light Field Display Device and Augmented Reality Display Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the technical field of display devices, and in particular to a light field display device and an augmented reality display device. Background Art

[0003] Augmented reality (AR) near-eye display technology is a wearable display system that uses a certain optical system to enable the human eye to see both real scenes in the outside world and virtual scenes generated by a computer. In an AR system, the real scene observed by the user is analyzed and processed, and then the generated virtual augmented information is superimposed on the real scene through near-eye display technology, achieving a seamless fusion of real and virtual scenes and assisting users in gaining a deep and comprehensive understanding of the real world. Traditional AR display is based on binocular parallax, obtaining depth information by fusing the parallax of the left and right eyes to produce a scene with a three-dimensional effect. However, this method has the problem of vergence-accommodation conflict (VAC), which can cause problems such as visual fatigue and dizziness, causing discomfort. Summary of the Invention

[0004] Embodiments of the present application provide a light field display device and an augmented reality display apparatus, which can realize light field display and solve the convergence adjustment conflict problem.

[0005] The first aspect of the present application provides a light field display device, comprising an imaging device and an optical fuser. The imaging device is used to generate multiple virtual images at different viewing angles in turn within a cycle. The imaging device includes an imaging element and multiple light sources. All light sources emit light in turn within a cycle. Any two light sources do not emit light at the same time within a cycle. The imaging element modulates an imaging light beam according to the light beam emitted by the light source. The multiple imaging light beams generated within a cycle are used to form multiple virtual images at different viewing angles in turn. The optical fuser projects all imaging light beams generated by the imaging device within a cycle to the human eye in turn, and is used to project an ambient light beam to the human eye.

[0006] By controlling all light sources to emit light in turn within a cycle, the imaging element can modulate multiple imaging light beams with different position information and angle information based on the light beams emitted by light sources at different positions, so that the pupil of the human eye can receive multiple imaging light beams emitted by the light field display device within one cycle. Then, the position distribution and angle distribution of the multiple imaging light beams generated by the light field display device within one cycle at the pupil position are the same as the position distribution and angle distribution of light in the real scene. Then, the virtual image observed by the user is the same as the real scene, realizing light field display.

[0007] The multiple imaging light beams generated in turn by the imaging device within a cycle have different positional and angular information, allowing the imaging device to generate multiple virtual images at different perspectives within a cycle. The depths of field of any two virtual images within a cycle are different. Based on the principle of persistence of vision, a user can simultaneously see multiple virtual images at different depths of field within a cycle. In other words, a user can simultaneously see multiple virtual images at different perspectives within a cycle, achieving a multi-depth display. Therefore, when displaying an object to be displayed, within a cycle, the imaging device can generate multiple virtual images corresponding to different perspectives of the object to be displayed, allowing the user to view the object to be displayed from different perspectives. Furthermore, the user can distinguish the distance of the object to be displayed based on the virtual images corresponding to the object to be displayed at different perspectives. This allows the user to view the object to be displayed in the same way as viewing objects in a real environment (natural environment), thus avoiding convergence accommodation conflicts.

[0008] It can be understood that by displaying the object to be displayed through multiple virtual images at different perspectives, the brain can distinguish the distance of the object to be displayed based on the multiple imaging light beams that form the multiple virtual images, so that the human eye can focus on the virtual image plane where the object to be displayed is located, and then the distance perceived by the human eye is consistent with the distance focused by the human eye, that is, the virtual image distance and the apparent distance are equal, which can avoid convergence accommodation conflict.

[0009] In a possible implementation, all light sources are arranged in an array, the number of the imaging element is one, and the imaging element is a digital micromirror device or liquid crystal on silicon.

[0010] In this way, when light sources at different locations are illuminated, the imaging element can modulate imaging beams with different positional and angular information, causing the imaging beams to hit different locations in the pupil. This results in the virtual image corresponding to each light source having a different depth of field, thus enabling light field display. Furthermore, due to the high refresh rate of the imaging element, the resolution of the imaging element is not lost, enabling high-resolution light field display.

[0011] In a possible implementation, all light sources are arranged in an array along a first direction and a second direction, wherein the first direction and the second direction are perpendicular.

[0012] This two-dimensional array of light sources better fits the shape of the human eye, improving the eye movement range of light field displays. Furthermore, a larger number of light sources can be arranged within a given area, allowing the human eye to observe a greater number of virtual images within a single cycle, resulting in a smaller depth of field and better out-of-focus blur effects.

[0013] In a possible implementation, all light sources are arranged in an N*M array, where N and M are positive integers, and both N and M are greater than or equal to 3.

[0014] In this way, on the basis of achieving light field display, the problem of out-of-focus blur can be better solved. In addition, the more light sources there are, the better the out-of-focus effect will be.

[0015] In a possible implementation, the imaging device further includes an optical element, which is used to transmit the light beam emitted by the light source to the imaging element, and to transmit the imaging light beam generated by the imaging element to the optical fuser.

[0016] In this way, the number of parts of the light field display device can be reduced, which helps to simplify the structure of the light field display device and also helps to miniaturize the light field display device.

[0017] In a possible implementation, the optical element is a polarization beam splitter prism.

[0018] In this way, the light beam emitted by the light source can be reflected to the imaging element, and the imaging light beam generated by the imaging element can be transmitted to the optical fuser.

[0019] In one possible embodiment, the optical element includes a slab waveguide, an incoupling grating, and an outcoupling grating. The incoupling grating is configured to receive a light beam emitted by a light source and guide the received light beam into the slab waveguide. The slab waveguide is configured to guide the received light beam emitted by the light source to the outcoupling grating, and to guide the imaging light beam to the optical fuser. The outcoupling grating is configured to guide the received light beam emitted by the light source to the imaging element, and to guide the imaging light beam generated by the imaging element into the slab waveguide.

[0020] This allows the light beam from the light source to be reflected toward the imaging element, and the imaging beam generated by the imaging element to be transmitted toward the optical fuser. Furthermore, the slab waveguide's plate structure reduces the size of the optical element, contributing to the miniaturization of light field display devices.

[0021] In a possible implementation, the imaging device further includes an imaging lens assembly, which is used to form a virtual image according to the imaging light beam emitted by the optical element, and to project the imaging light beam emitted by the optical element to the optical fuser.

[0022] In this way, the imaging light beam can form a virtual image and transmit the virtual image to the optical fuser, so that the user observes the virtual image.

[0023] In a possible implementation, the imaging device further includes a collimating lens group, which is disposed on the optical path between the optical element and the light source, and is used to collimate the light beam emitted by the light source.

[0024] In this way, the display effect of the light field display device can be improved.

[0025] In one possible embodiment, the imaging device further includes a collimating lens group, which is arranged in the optical path between the optical element and the imaging element. The collimating lens group is used to collimate the light beam emitted by the light source from the optical element to the imaging element, and to collimate the imaging light beam emitted from the imaging element to the optical element.

[0026] In this way, the display effect of the light field display device can be improved.

[0027] In one possible embodiment, there are multiple imaging elements, all arranged in an array, each of which is a micro-electromechanical system or a fiber scanner. Each imaging element corresponds to a light source and is configured to generate an imaging beam based on the light beam emitted by the corresponding light source.

[0028] In this way, within a cycle, when each light source is illuminated, the corresponding imaging element can modulate an imaging beam with different position and angle information, so that the imaging beam hits different locations of the pupil and forms a virtual image. This results in the virtual images generated by the imaging elements at different locations having different depths of field, thus achieving light field display and resolving the convergence accommodation conflict issue. Furthermore, because the imaging elements have a high refresh rate, their resolution is not lost, enabling high-resolution light field display.

[0029] In a possible implementation, all imaging elements are arranged in an array along a first direction and a second direction, wherein the first direction and the second direction are perpendicular to each other.

[0030] This allows imaging elements to be arranged in a two-dimensional array, better suiting the shape of the human eye and improving the eye movement range of light field displays. Furthermore, a larger number of imaging elements can be arranged within a given area, allowing the human eye to observe a greater number of virtual images within a single cycle, resulting in a smaller depth of field and better out-of-focus blur effects.

[0031] In one possible implementation, all imaging elements are arranged in an N*M array, where N and M are positive integers, and both N and M are greater than or equal to 3.

[0032] In this way, on the basis of achieving light field display, the problem of out-of-focus blur can be better solved. In addition, the more imaging elements there are, the better the out-of-focus effect will be.

[0033] In one possible embodiment, the optical fusion device includes a polarizing beam splitter and a semi-transparent and semi-reflective mirror. The polarizing beam splitter is used to reflect the imaging beam to the semi-transparent and semi-reflective mirror, and to transmit the imaging beam reflected by the semi-transparent and semi-reflective mirror into the human eye. The polarizing beam splitter is also used to transmit the ambient light beam emitted from the semi-transparent and semi-reflective mirror into the human eye. The semi-transparent and semi-reflective mirror is used to reflect the received imaging beam to the polarizing beam splitter, and to transmit the ambient light beam to the polarizing beam splitter.

[0034] In this way, the user can observe the virtual image formed by the light field display device while also observing the scenery in the real environment.

[0035] In one possible embodiment, the optical fuser includes a fusion device. The fusion device is used to transmit the imaging light beam into the human eye and to transmit the ambient light beam into the human eye. The fusion device is a semi-transparent and semi-reflective mirror, a holographic film, or a metasurface.

[0036] In this way, the user can observe the virtual image formed by the light field display device while also observing the scenery in the real environment.

[0037] A second aspect of the present application provides an augmented reality display device, comprising a controller and a light field display device as described in any one of the first aspects. The controller is configured to control all light sources in the light field display device to emit light in turn within a cycle, and to control imaging elements in the light field display device to generate multiple imaging light beams in turn within a cycle based on the light beams emitted by the light sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1a is a schematic diagram of the light path when the human eye views a real scene;

[0039] FIG1b is a schematic diagram of the optical path when the human eye views the light field display system;

[0040] FIG2 is a schematic diagram of the architecture of an augmented reality display in the related art;

[0041] FIG3 is a schematic diagram showing the principle of convergence regulation conflict;

[0042] FIG4 is a schematic diagram of the structure of a light field display device in the related art;

[0043] FIG5 is a schematic diagram of the architecture of an augmented reality display device provided in an embodiment of the present application;

[0044] FIG6 is a schematic diagram of the architecture of a first light field display device provided in an embodiment of the present application;

[0045] FIG7 is a schematic diagram of the fifth light source in the light field display device shown in FIG6 emitting light;

[0046] FIG8 is a schematic diagram of a light-emitting sequence of a light source provided in an embodiment of the present application;

[0047] FIG9 is a schematic diagram of an imaging beam received by a human eye during one cycle;

[0048] FIG10 is a schematic diagram showing the correspondence between light source and viewing angle;

[0049] FIG11 is a schematic diagram of another arrangement of light sources provided in an embodiment of the present application;

[0050] FIG12 is a schematic diagram of the architecture of a second light field display device provided in an embodiment of the present application;

[0051] FIG13 is a schematic diagram of the architecture of a third light field display device provided in an embodiment of the present application;

[0052] FIG14 is a schematic diagram of the architecture of a fourth light field display device provided in an embodiment of the present application;

[0053] FIG15 is a schematic diagram of the architecture of another augmented reality display device provided in an embodiment of the present application;

[0054] FIG16 is a schematic diagram of the architecture of another augmented reality display device provided in an embodiment of the present application;

[0055] FIG17 is a schematic diagram of the architecture of a fifth light field display device provided in an embodiment of the present application;

[0056] FIG18 is a schematic diagram of the operation of the light field display device shown in FIG17 ;

[0057] FIG19 is a schematic diagram of another arrangement of imaging elements provided in an embodiment of the present application.

[0058] Explanation of the accompanying symbols: 100, augmented reality display device; 200, light field display device; 300, controller; 400, mirror body; 410, frame; 420, temple; 210, imaging device; 220, optical fuser; 10, imaging element; 20, light source; 30, optical element; 31, planar waveguide; 32, in-coupling grating; 33, out-coupling grating; 40, imaging lens group; 50, collimating lens group; 60, fusion device; 61, first fusion device; 62, second fusion device; 70, polarization beam splitter; 80, semi-transparent and semi-reflective mirror; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0059] The following is an explanation of some of the terms used in the examples of this application. It should be noted that these explanations are for the purpose of facilitating understanding by those skilled in the art and do not limit the scope of protection claimed in this application.

[0060] Virtual image: When light from an object changes its path through refraction or reflection, the human eye perceives the refracted or reflected light as originating from the intersection of its reverse extensions. The intersection of these reverse extensions forms an image. The location of the virtual image is called the virtual image position, and the plane on which the virtual image resides is called the virtual image plane. The distance between the virtual image position and the human eye is called the virtual image distance. It should be understood that there is no actual object or converging light at the virtual image position.

[0061] Real image plane: the plane where the real scene (natural scene) or the real scene is located.

[0062] A semi-transparent, semi-reflective mirror: also known as a beam splitter, a beam splitter, or a half-reflective, half-mirror lens. It is an optical element that uses a semi-reflective film coated on optical glass, or a semi-transparent, semi-reflective film coated on one optical surface of a lens, to change the original ratio of transmission and reflection of the incident light beam. The coating can increase transmittance, increasing light intensity, or increase reflection, decreasing light intensity. For example, a semi-transparent, semi-reflective mirror can transmit and reflect incident light in a 50:50 ratio. That is, the transmittance and reflectance of a semi-transparent, semi-reflective mirror are each 50%. When the incident light passes through the semi-transparent, semi-reflective mirror, the intensity of the light transmitted and the intensity of the light reflected back each account for 50%. Of course, the reflectivity and transmittance can be selected according to specific needs. For example, the reflectivity can be higher than 50% and the transmittance lower than 50%, or the reflectivity can be lower than 50% and the transmittance lower than 50%.

[0063] Figure 1a is a schematic diagram of the light path when the human eye views a real scene.

[0064] As shown in Figure 1a, the same object can emit multiple light rays in different directions, and the pupil of the human eye (the black part in Figure 1a) can receive multiple light rays emitted by the same object. The multiple light rays have different position information (referring to hitting different positions of the pupil) and angle information (the angle of light propagation). Therefore, the brain can distinguish the distance of the object based on the position and angle information of the light.

[0065] FIG1b is a schematic diagram of the optical path when the human eye views the light field display system.

[0066] Light field display: A specific optical system generates light with a distribution identical to that in a real scene, i.e., light with a specific positional and angular distribution, simulating a real scene. For example, as shown in Figure 1b, if the positional and angular distribution of light generated by light field display system 500 at the pupil position matches that in a real scene, the user's perception of the scene will be the same as in a real scene, with the expected distance information of objects.

[0067] FIG. 2 is a schematic diagram of the architecture of an augmented reality display in the related art.

[0068] In related art, as shown in FIG2 , an augmented reality display includes an optical fuser 301 and a display device 302. Users can observe the real scene in their surroundings through the optical fuser 301 and also see the virtual scene generated by the display device 302. However, augmented reality displays, based on the principle of binocular parallax, obtain depth information by fusing the parallax of the left and right eyes. This results in a vergence and accommodation conflict (VAC) problem, which can cause discomfort to users.

[0069] FIG3 is a schematic diagram showing the principle of convergence regulation conflict.

[0070] Specifically, the conflict between the monocular focus position (the distance determined by the human eye's focusing, such as the virtual image distance L1 in Figure 3) and the binocular parallax position (the distance determined by the binocular parallax, such as the visual distance L2 in Figure 3) will lead to a vergence-accommodation conflict. The mechanism of vergence-accommodation conflict can be described as follows: augmented reality displays generally only produce a virtual image position (such as the virtual image plane in Figure 3), and the human eye must focus on this virtual image to see a clear image. At the same time, in order to produce stereoscopic vision, the virtual image distance is generated by binocular parallax, and the virtual image distance is related to the displayed content.

[0071] As shown in a in FIG3 , the virtual image distance L1 is equal to the apparent distance L2. At this time, the human eye's perception distance is consistent with the human eye's focusing distance. There will be no convergence adjustment conflict, and the user will not feel uncomfortable.

[0072] As shown in Figure 3b, the virtual image plane is far from the human eye, and the virtual image's virtual image distance L1 is also far away. The human eye needs to relax its glasses and focus far enough to see the virtual image clearly. However, the resulting apparent disparity L2 (determined by the angle θ between the two virtual images relative to the human eye) is close. Since apparent disparity L2 is smaller than virtual image distance L1 and the virtual image angle θ is large, the user perceives the virtual image as being close, resulting in a VAC problem and discomfort.

[0073] As shown in Figure 3 (c), the virtual image plane is close to the human eye, and the virtual image is located at a distance L1. The human eye needs to focus close to see the virtual image clearly. However, the generated visual disparity L2 is farther away, and the virtual image angle θ is small. This conflicts with the user's usual eye habits, leading to VAC problems and discomfort.

[0074] In summary, when the monocular focus position and binocular parallax position do not match, in other words, when the virtual image distance L1 and the visual disparity L2 are not equal, it will cause a vergence accommodation conflict, causing user discomfort. Therefore, how to achieve light field display while avoiding vergence accommodation conflict has become an urgent problem to be solved.

[0075] FIG. 4 is a schematic diagram of the structure of a light field display device in the related art.

[0076] In one embodiment, as shown in FIG4 , a light field display device includes a display screen 101, a microlens array 102, and an eyepiece system 103. A microlens array 102 is added to the surface of the display screen 101, and multiple pixels covered by a single sub-lens in the microlens array 102 are imaged by the eyepiece system 103 after passing through the sub-lenses. For example, the five sub-pixels covered by a sub-lens a at the bottom of the X direction in FIG4 can be referred to as a macropixel. Light emitted by the macropixel becomes parallel light with a certain aperture after passing through the eyepiece system 103 (as transmitted toward the upper right in FIG4 ). The intensity of light at different positions in the parallel light is controlled by the brightness resolution of the five sub-pixels. The overall luminous intensity of the five sub-pixels is the brightness of the parallel light. The pupil position, parallel light in different directions, and light at different positions are controlled separately by each macropixel and each sub-pixel. Therefore, this light field display solution can control the intensity of light at different positions and directions seen by the pupil, thereby achieving light field display and resolving the problem of convergence regulation conflict.

[0077] However, the actual display resolution of this solution is determined by the number of macropixels, and there is a proportional relationship between the number of macropixels and the resolution of the screen. Generally, the number of macropixels in a single direction is one-third to one-fifth of the screen resolution. For example, a 3000*3000 display screen 101 can display 1000*1000 macropixels (a ratio of 3 / 1). Therefore, this light field display solution will lose a lot of screen resolution.

[0078] In view of this, the embodiments of the present application provide a light field display device 200 and an augmented reality display device 100. By generating multiple virtual images at different perspectives within a cycle, the multiple virtual images correspond to different perspectives of the object to be displayed. This allows the brain to determine the distance of the object to be displayed, and the human eye can then focus on the virtual image plane where the object to be displayed is located. This ensures that the perceived distance and the human eye's focusing distance are consistent, that is, the virtual image distance and the visual distance are equal. This can achieve light field display while avoiding convergence accommodation conflicts. Furthermore, high-resolution light field display can be achieved, improving the light field display effect.

[0079] In the embodiments of the present application, the augmented reality display device 100 is a device that can be worn on a user's head and can be used to display images in front of the user's line of sight. The augmented reality display device 100 may include, but is not limited to, a virtual reality (VR) device, an augmented reality (AR) device, or a mixed reality (MR) device. The embodiments of the present application are described using the augmented reality display device 100 as an AR device as an example.

[0080] FIG5 is a schematic diagram of the architecture of an augmented reality display device provided in an embodiment of the present application.

[0081] As shown in Figure 5, the augmented reality display device 100 includes a controller 300 and a light field display device 200. Among them, the controller 300 is used to control the light field display device 200 to generate multiple imaging light beams containing different position information and angle information in turn within a cycle. The multiple imaging light beams are respectively hit at different positions of the pupil of the human eye and form a virtual image respectively, thereby realizing light field display. Due to the persistence of vision, within a cycle, the user can take turns to see virtual images of different depths of field, which can match the depth of field of the natural scene, so that the virtual image distance is the same as the visual distance, which can solve the problem of convergence accommodation conflict. At the same time, the light field display device 200 can also project the ambient light beam into the human eye, so that the user can see the natural scene in the surrounding environment, realizing the combination of virtual information and the real environment.

[0082] FIG6 is a schematic diagram of the architecture of a first light field display device provided in an embodiment of the present application, and FIG7 is a schematic diagram of the fifth light source in the light field display device shown in FIG6 emitting light.

[0083] As shown in Figure 6, light field display device 200 includes an imaging device 210 and an optical fuser 220. The imaging device 210 is configured to generate multiple imaging beams in a cycle, which are then used to form multiple virtual images at different viewing angles. The optical fuser 220 is configured to project all imaging beams generated by the imaging device 210 in a cycle into the human eye in turn, and to project ambient light beams into the human eye, allowing the user to see not only the virtual images generated by the imaging device 210 but also the real images of the surrounding environment.

[0084] One cycle can be understood as one light field frame or one frame. In one cycle, the user can see all virtual images formed by the imaging device 210 at the same time.

[0085] As shown in Figure 6, the imaging device 210 includes an imaging element 10 and a plurality of light sources 20. For example, as shown in Figure 6, the number of light sources 20 is five (as shown in 20A to 20E in Figure 6), but the number of light sources 20 can be more or less than five. All light sources 20 are arranged in an array. As shown in Figure 6, all light sources 20 are arranged in one dimension. In other words, all light sources 20 are arranged side by side along a preset direction. All light sources 20 emit light in turn within a cycle, and any two light sources 20 do not emit light at the same time within a cycle (as shown in Figures 6 and 7). The imaging element 10 modulates a plurality of imaging light beams with different position information and angle information in turn according to the light beams emitted by all light sources 20 in a cycle. The plurality of imaging light beams generated in a cycle form a plurality of virtual images at different viewing angles in turn.

[0086] Within a cycle, the position and angle information of the imaging beams that form any two virtual images are different, resulting in the two virtual images being at different viewing angles. The position information refers to the position where the imaging beam hits the human eye, and the angle information refers to the angle at which the imaging beam propagates.

[0087] Optical fuser 220 is used to project the ambient light beam into the human eye, allowing the user to see the natural scenery in the surrounding environment. Simultaneously, optical fuser 220 is also used to alternately project all imaging light beams generated by imaging element 10 within a cycle into the human eye, allowing the user to see multiple virtual images from different perspectives within a cycle. Thus, optical fuser 220 can overlay virtual information onto the real environment, allowing the user to simultaneously see the surrounding environment and virtual information.

[0088] Exemplarily, each light source 20 and imaging element 10 is electrically connected to a controller 300 (not shown in FIG6 ) respectively. The controller 300 can control all light sources 20 to emit light in turn within a cycle according to the display content, and control the imaging element 10 to generate multiple imaging light beams with different position information and angle information in turn within a cycle, thereby forming multiple virtual images generated in turn within a cycle. Based on the persistence of vision, the user can see multiple images constructed by the imaging device 210 and at different perspectives within a cycle (for example, as shown in FIG9 ).

[0089] It should be noted that, in addition to being controlled by the same controller 300 , each light source 20 and imaging element 10 may also be controlled by different controllers 300 .

[0090] It should be noted that due to the persistence of vision, the human eye cannot distinguish the temporal order of the multiple images displayed by the image device 210 within one cycle. Therefore, the lighting sequence of all the light sources 20 is not limited here.

[0091] Figure 8 is a schematic diagram of a light source emission sequence provided in an embodiment of the present application, Figure 9 is a schematic diagram of an imaging beam received by the human eye during one cycle, and Figure 10 is a schematic diagram of the correspondence between the light source and the viewing angle. The position of the light source relative to the imaging element in Figure 8 is different from the position of the light source relative to the imaging element in Figure 6 . However, the position of the light source relative to the imaging element in Figure 8 can also be set to the same position as the light source relative to the imaging element in Figure 6 .

[0092] For example, as shown in FIG8 , the five light sources 20 are a first light source 20A, a second light source 20B, a third light source 20C, a fourth light source 20D, and a fifth light source 20E, arranged side by side and in sequence. Referring to FIG8 to FIG10 , within a cycle, the first light source 20A, the second light source 20B, the third light source 20C, the fourth light source 20D, and the fifth light source 20E are sequentially illuminated, allowing the human eye to see five images at different viewing angles.

[0093] As shown in Figure 6, all light sources 20 are arranged in an array, with each light source 20 having a specific position. Therefore, when light sources 20 at different positions are turned on, the imaging element 10 can modulate imaging light beams with different positional and angular information, so that the imaging light beams hit different positions of the pupil, thereby constructing multiple perspective images at different viewing angles.

[0094] For example, in combination with Figures 8 to 10, it can be seen that when the first light source 20A is turned on, the imaging element 10 can generate a first imaging beam based on the light beam emitted by the first light source 20A, and the first imaging beam is used to generate a first-perspective image at a first perspective. When the second light source 20B is turned on, the imaging element 10 can generate a second imaging beam based on the light beam emitted by the second light source 20B, and the second imaging beam is used to generate a second-perspective image at a second perspective. Similarly, when the third light source 20C is turned on, a third-perspective image at a third perspective can be generated. When the fourth light source 20D is turned on, a fourth-perspective image at a fourth perspective can be generated. When the fifth light source 20E is turned on, a fifth-perspective image at a fifth perspective can be generated.

[0095] It can be seen that the number of light sources 20 and the observation viewpoints are conjugate to each other. For example, as shown in FIG9 , the number of light sources 20 is five, and correspondingly, the number of observation viewpoints is also five. The observation viewpoint can also be understood as the number of viewing angles at which the human eye observes all images within one cycle.

[0096] In summary, by controlling all the light sources 20 to emit light in turn within a cycle, the imaging element 10 can generate multiple imaging light beams with different position information and angle information based on the light beam modulation emitted by the light source 20 at different positions, so that the pupil of the human eye can receive multiple imaging light beams emitted by the light field display device 200 within one cycle, and then the position distribution and angle distribution of the multiple imaging light beams generated by the light field display device 200 within one cycle at the pupil position are the same as the position distribution and angle distribution of the light in the real scene, so the virtual image observed by the user is the same as the real scene, realizing light field display.

[0097] The multiple imaging light beams generated in turn by the image device 210 within a cycle have different position information and angle information, so that the image device 210 can generate multiple virtual images at different perspectives within a cycle. The depth of field of any two virtual images within a cycle is different. Based on the principle of visual persistence, the user can simultaneously see multiple virtual images at different depths of field within a cycle. In other words, the user can simultaneously see multiple virtual images at different perspectives within a cycle, realizing a multi-depth display. Therefore, when displaying an object to be displayed, within a cycle, the image device 210 can generate multiple virtual images corresponding to different perspectives of the object to be displayed, so that the user can view the object to be displayed from different perspectives, and further, can distinguish the distance of the object to be displayed based on the virtual images at different perspectives corresponding to the object to be displayed, so that the user can view the object to be displayed in the same way as viewing objects in the real environment (natural environment), avoiding convergence accommodation conflicts.

[0098] It can be understood that by displaying the object to be displayed through multiple virtual images at different perspectives, the brain can distinguish the distance of the object to be displayed based on the multiple imaging light beams that form the multiple virtual images, so that the human eye can focus on the virtual image plane where the object to be displayed is located, and then the distance perceived by the human eye is consistent with the distance focused by the human eye, that is, the virtual image distance and the apparent distance are equal, which can avoid convergence accommodation conflict.

[0099] The imaging element 10 can be a digital micro-mirror device (DMD) or liquid crystal on silicon (LCOS). DMD and LCOS are reflective structures. The refresh rate of DMD and LCOS is high, so that the resolution of DMD and LCOS is not lost. Therefore, the resolution and aperture ratio of the imaging element 10 are high, and high-resolution light field display can be achieved.

[0100] FIG11 is a schematic diagram of another arrangement of light sources provided in an embodiment of the present application.

[0101] In some possible implementations, as shown in FIG11 , all light sources 20 are arranged in an array along a first direction X and a second direction Y. The first direction X and the second direction Y are perpendicular. This arrangement of the light sources 20 in a two-dimensional array better aligns with the shape of the human eye, improving the eye movement range of light field displays. Furthermore, a larger number of light sources 20 can be arranged within a given area, allowing the human eye to observe a greater number of virtual images within a single cycle, resulting in a smaller depth of field and a better out-of-focus blur effect.

[0102] When all the light sources 20 are arranged in two dimensions, the number of the light sources 20 is at least four. In addition, when the light sources 20 are arranged in two dimensions, all the light sources 20 can be arranged in a rectangular, triangular, honeycomb, circular or other shape.

[0103] Specifically, along the first direction X and the second direction Y, all the light sources 20 form an N*M array, where N and M are positive integers, and both N and M are greater than or equal to 2. For example, as shown in FIG11 , N is 2, M is 3, and the number of light sources 20 is six, forming a 2*3 array.

[0104] When all light sources 20 are arranged in a two-dimensional array, the number of observation viewpoints in one cycle is N*M. For example, as shown in FIG11 , when the light sources 20 are arranged in a 2*3 array, the number of observation viewpoints is 2×3=6, and the human eye can see 6 images in one cycle.

[0105] In some possible implementations, N and M are both greater than or equal to 3. In this way, the defocusing problem can be better solved on the basis of achieving light field display. In addition, the more light sources 20 there are, the better the defocusing effect.

[0106] In some possible implementations, as shown in FIG6 , the imaging device 210 further includes an optical element 30. The optical element 30 is configured to transmit the light beam emitted by the light source 20 to the imaging element 10, and to transmit the imaging light beam generated by the imaging element 10 to the optical fuser 220. This configuration can reduce the number of components in the light field display device 200, simplifying the structure of the light field display device 200 and facilitating miniaturization of the light field display device 200.

[0107] As shown in Figure 6, the imaging light beam generated by the imaging element 10 and the light beam emitted by the light source 20 share the optical element 30. However, in some implementations, the imaging device 210 may also include a first optical component (not shown in the figure) and a second optical component (not shown in the figure). The first optical component is used to transmit the light emitted by the light source 20 to the imaging element 10, and the second optical component is used to transmit the imaging light beam generated by the imaging element 10 to the optical fuser 220.

[0108] Exemplarily, as shown in FIG6 , the optical element 30 is a polarization beam splitter prism, which can reflect the light beam emitted by the light source 20 to the imaging element 10 , and transmit the imaging light beam generated by the imaging element 10 to the optical fuser 220 .

[0109] It should be noted that, in addition to being a polarization beam splitter prism, the optical element 30 may also be other structures.

[0110] FIG12 is a schematic diagram of the architecture of a second light field display device provided in an embodiment of the present application.

[0111] In some possible implementations, as shown in FIG12 , the optical element 30 includes a slab waveguide 31, an incoupling grating 32, and an outcoupling grating 33. The incoupling grating 32 is configured to receive a light beam emitted by the light source 20 and guide the received light beam from the light source 20 into the slab waveguide 31. The slab waveguide 31 is configured to guide the received light beam from the light source 20 to the outcoupling grating 33, and to guide the imaging light beam to the optical fuser 220. The outcoupling grating 33 is configured to guide the received light beam from the light source 20 to the imaging element 10, and to guide the imaging light beam generated by the imaging element 10 into the slab waveguide 31.

[0112] The slab waveguide 31, the incoupling grating 32, and the outcoupling grating 33 cooperate to reflect the light beam emitted by the light source 20 to the imaging element 10, and transmit the imaging light beam generated by the imaging element 10 to the optical fuser 220. Furthermore, the slab structure of the slab waveguide 31 reduces the size of the optical element 30, thereby contributing to the miniaturization of the light field display device 200.

[0113] As shown in Figure 12, the coupling-in grating 32 and the coupling-out grating 33 are connected to the same side of the slab waveguide 31. However, in some implementations, the coupling-out grating 33 and the coupling-in grating 32 can also be set on different sides of the slab waveguide 31, and the light beam emitted by the light source 20 can be reflected to the imaging element 10, and the imaging light beam generated by the imaging element 10 can be transmitted to the optical fuser 220.

[0114] In some possible implementations, as shown in FIG6 , the imaging device 210 further includes an imaging lens assembly 40, which is disposed in the optical path between the optical element 30 and the optical fuser 220. The imaging lens assembly 40 is configured to form a virtual image (as shown by a1 to a5 in FIG6 ) based on the imaging light beam emitted by the optical element 30, and to project the imaging light beam emitted by the optical element 30 onto the optical fuser 220. In this way, the imaging light beam can form a virtual image, and the virtual image is transmitted to the optical fuser 220, allowing the user to observe the virtual image.

[0115] The imaging lens assembly 40 may be formed by one or more lenses, which is not specifically limited here.

[0116] In some possible implementations, as shown in FIG6 , the imaging device 210 further includes a collimating lens assembly 50 disposed on the optical path between the imaging element 10 and the optical element 30. The collimating lens assembly 50 is used to collimate the light beam emitted by the light source 20 from the optical element 30 to the imaging element 10, and to collimate the imaging light beam emitted from the imaging element 10 to the optical element 30. This can improve the display effect of the light field display device 200.

[0117] The collimating lens assembly 50 may include one or more collimating lenses, which is not specifically limited here.

[0118] It should be noted that, in addition to being disposed on the optical path between the imaging element 10 and the optical element 30 , the collimating lens assembly 50 may also be disposed on the optical path between the optical element 30 and the light source 20 .

[0119] FIG13 is a schematic diagram of the architecture of a third light field display device provided in an embodiment of the present application.

[0120] In some possible implementations, as shown in FIG13 , a collimating lens assembly 50 is disposed in the optical path between the optical element 30 and the light source 20. The collimating lens assembly 50 is configured to collimate the light beam emitted by the light source 20 and project the collimated light beam emitted by the light source 20 onto the optical element 30. This can also improve the display effect of the light field display device 200.

[0121] The collimating lens group 50 may include one or more collimating lenses. For example, as shown in FIG13 , the collimating lens group 50 may include a first collimating lens 51 and a second collimating lens 52. Of course, the number of collimating lenses may be more than two.

[0122] In the embodiment of the present application, there is no limitation on the specific structure of the optical fuser 220. Several optical fusers 220 with different structures are described below.

[0123] In some possible implementations, as shown in FIG6 , the optical fuser 220 may include a polarizing beam splitter 70 and a semi-transparent mirror 80. The polarizing beam splitter 70 is configured to reflect the imaging beam toward the semi-transparent mirror 80 and transmit the imaging beam reflected by the semi-transparent mirror 80 into the human eye. The polarizing beam splitter 70 is also configured to transmit the ambient light beam emitted from the semi-transparent mirror 80 into the human eye. The semi-transparent mirror 80 is configured to reflect the received imaging beam toward the polarizing beam splitter 70 and transmit the ambient light beam toward the polarizing beam splitter 70.

[0124] 6 , the polarization beam splitter 70 is a flat plate structure. Specifically, the polarization beam splitter 70 may include a flat plate body 400 and a polarization beam splitting film coated on a surface of the flat plate body 400 .

[0125] In other possible implementations, the optical fuser 220 includes a fusion device 60, which is used to transmit the imaging light beam to the human eye and to transmit the ambient light beam to the human eye. In this way, the user can observe the virtual image formed by the light field display device 200 while also observing the scenery in the real environment.

[0126] There is no limitation on the specific structure of the fusion device 60. In some implementations, as shown in FIG13 , the fusion device 60 can be a semi-transparent and semi-reflective mirror 80. Of course, the fusion device 60 can also be other structures.

[0127] FIG14 is a schematic diagram of the architecture of a fourth light field display device provided in an embodiment of the present application.

[0128] The difference between FIG14 and FIG13 is that the fusion device 60 is a plate structure and the type of the fusion device 60 is different. The fusion device 60 can be a holographic film or a metasurface.

[0129] In the above content, the number of the fusion device 60 is one, as shown in FIG. 12 to FIG. 13 , for example, however, the number of the fusion device 60 may also be multiple.

[0130] FIG15 is a schematic diagram of the architecture of another augmented reality display device provided in an embodiment of the present application, and FIG16 is a schematic diagram of the architecture of yet another augmented reality display device provided in an embodiment of the present application.

[0131] As shown in FIG15 , there are two fusion devices 60 , and the two fusion devices 60 include a first fusion device 61 and a second fusion device 62 . The first fusion device 61 and the second fusion device 62 can both transmit the ambient light beam and allow the human eye to receive the ambient light beam. The first fusion device 61 can reflect the imaging light beam reflected by the second fusion device 62 into the human eye.

[0132] For example, as shown in the figure, the first fusion device 61 can be a metasurface, and the second fusion device 62 can be a semi-transparent mirror 80. Thus, it can be seen that the first fusion device 61 and the second fusion device 62 are of different types. However, the first fusion device 61 and the second fusion device 62 can also be of the same type. For example, as shown in FIG16 , the first fusion device 61 and the second fusion device 62 can both be metasurfaces or holographic films.

[0133] Exemplarily, as shown in FIG15 , the optical element 30 is composed of a slab waveguide 31 , an in-coupling grating 32 , and an out-coupling grating 33 , so that the volume of the optical element 30 is small, and thus the light field display device 200 can be applied to AR glasses.

[0134] Among them, the AR glasses include a lens body 400 and two light field display devices 200. The lens body 400 is used to carry the two light field display devices 200. The lens body 400 includes a frame 410 and two temples 420. The two temples 420 are respectively connected to the opposite ends of the frame 410.

[0135] It should be noted that when the optical element 30 is composed of a slab waveguide 31, an in-coupling grating 32, and an out-coupling grating 33, the imaging device 210 may include an imaging lens group 40 (as shown in FIG15 ), or the imaging device 210 may not include the imaging lens group 40 (as shown in FIG16 ).

[0136] In the above description, the imaging element 10 in the imaging device 210 is a DMD or LCOS. The imaging element 10 cooperates with the array of multiple light sources 20 to generate multiple images at different viewing angles within a single cycle. However, the imaging device 210 may also have other structures and may also generate multiple images at different viewing angles within a single cycle.

[0137] FIG17 is a schematic diagram of the architecture of a fifth light field display device provided in an embodiment of the present application, and FIG18 is a schematic diagram of the operation of the light field display device shown in FIG17 .

[0138] The difference between FIG. 17 and FIG. 6 is that the structure of the imaging device 210 is different. Specifically, as shown in FIG. 17 , there are multiple imaging elements 10. For example, as shown in FIG. 17 , there are five imaging elements 10. Of course, the number of imaging elements 10 may be more or less than five. All imaging elements 10 are arranged in an array. For example, as shown in FIG. 17 , all imaging elements 10 are arranged in one dimension. In other words, all imaging elements 10 are arranged side by side along a preset direction. Each imaging element 10 corresponds to a light source 20, and each imaging element 10 is used to generate an imaging beam according to the light beam emitted by the corresponding light source 20. Each imaging element 10 is a micro-electro-mechanical system (MEMS) or a fiber scanning display (FSD).

[0139] In one cycle, each light source 20 is turned on in turn, and each imaging element 10 can generate multiple imaging light beams with different position information and angle information in turn according to the light beam emitted by the corresponding light source 20, so that multiple imaging light beams are received at different positions of the pupil of the human eye. Each imaging light beam can form a virtual image with depth of field, realizing light field display while solving the convergence adjustment conflict problem.

[0140] It can be understood that within one cycle, the user can see multiple perspective images at different perspectives.

[0141] For example, in conjunction with Figures 17 and 18 , it can be seen that the first imaging element 10A generates a first imaging beam based on the light beam emitted by the first light source 20A, and the first imaging beam forms a first-perspective image at a first perspective. The second imaging element 10B generates a second imaging beam based on the light beam emitted by the second light source 20B, and the second imaging beam forms a second-perspective image at a second perspective. The third imaging element 10C generates a third imaging beam based on the light beam emitted by the third light source 20C, and the third imaging beam forms a third-perspective image at a third perspective. The fourth imaging element 10D generates a fourth imaging beam based on the light beam emitted by the fourth light source 20D, and the fourth imaging beam forms a fourth-perspective image at a fourth perspective. The fifth imaging element 10E generates a fifth imaging beam based on the light beam emitted by the fifth light source 20E, and the fifth imaging beam forms a fifth-perspective image at a fifth perspective.

[0142] The imaging element 10 is a micro-electromechanical system or a fiber scanner, so that the imaging element 10 has a high refresh rate, and thus the resolution of the imaging element 10 is not lost, and high-resolution light field display can be achieved.

[0143] FIG19 is a schematic diagram of another arrangement of imaging elements provided in an embodiment of the present application.

[0144] In some possible implementations, as shown in FIG19 , all imaging elements 10 can also be arranged in an array along a first direction X and a second direction Y. The first direction X and the second direction Y are perpendicular. In this way, when all imaging elements 10 are arranged in a two-dimensional array, they better fit the shape of the human eye and can improve the eye movement range of light field displays. Furthermore, a larger number of imaging elements 10 can be arranged within a given area, allowing the human eye to observe a greater number of virtual images within a single cycle, resulting in a smaller depth of field and a better out-of-focus blur effect.

[0145] When all imaging elements 10 are arranged in two dimensions, the number of imaging elements 10 is at least four. In addition, when the imaging elements 10 are arranged in two dimensions, all imaging elements 10 can be arranged in a rectangular, triangular, honeycomb, circular or other shape.

[0146] Specifically, all imaging elements 10 are in an N*M array, where N and M are positive integers and both are greater than or equal to 2. For example, N is 2 and M is 3, and all imaging elements 10 form a 2*3 array, and the total number of imaging elements 10 is 6.

[0147] In some possible implementations, N and M are both greater than or equal to 3. In this way, the defocusing problem can be better solved on the basis of achieving light field display. In addition, the more imaging elements 10 there are, the better the defocusing effect.

[0148] In some implementations, there may be only one controller 300 , which is electrically connected to each light source 20 and each imaging element 10 , and is used to control the corresponding light sources 20 and imaging elements 10 to cooperate with each other to generate an imaging beam.

[0149] In other implementations, there may be multiple controllers 300 , each controller 300 corresponding to an imaging element 10 and a light source 20 , and each controller 300 is used to control the corresponding imaging element 10 and light source 20 to cooperate with each other to generate an imaging beam.

[0150] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0151] In the embodiments of the present application, any device or element referred to or implied must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise specifically specified.

[0152] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0153] The term "plurality" in this document refers to two or more. The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the related objects; in a formula, the character " / " indicates a "division" relationship between the related objects.

[0154] It will be understood that the various numerical numbers involved in the embodiments of the present application are merely distinctions for the convenience of description and are not intended to limit the scope of the embodiments of the present application.

[0155] It can be understood that in the embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Claims

1. A light field display device, characterized in that: including imaging devices and optical fusers; The imaging device is used to generate multiple virtual images at different viewing angles in a cycle in turn. The imaging device includes an imaging element and multiple light sources. All the light sources emit light in turn in a cycle, and no two light sources emit light at the same time in a cycle. The imaging element modulates an imaging light beam according to the light beams emitted by the light sources. The multiple imaging light beams generated in a cycle are used to form multiple virtual images at different viewing angles in turn. The optical fusion device is used to project all the imaging light beams generated by the imaging device in one cycle to the human eye in turn, and is used to project the ambient light beam to the human eye.

2. The light field display device according to claim 1, characterized in that All the light sources are arranged in an array, the number of the imaging element is one, and the imaging element is a digital micromirror device or liquid crystal on silicon.

3. The light field display device according to claim 2, characterized in that All the light sources are arranged in an array along a first direction and a second direction; wherein the first direction is perpendicular to the second direction.

4. The light field display device according to claim 3, characterized in that All the light sources are in an N*M array, wherein N and M are positive integers, and both N and M are greater than or equal to 3.

5. The light field display device according to any one of claims 2 to 4, characterized in that: The imaging device further includes an optical element, which is used to transmit the light beam emitted by the light source to the imaging element, and to transmit the imaging light beam generated by the imaging element to the optical fuser.

6. The light field display device according to claim 5, characterized in that The optical element is a polarization beam splitter prism.

7. The light field display device according to claim 5, characterized in that The optical element includes a slab waveguide, an incoupling grating and an outcoupling grating; The coupling-in grating is used to receive the light beam emitted by the light source and guide the received light beam emitted by the light source into the slab waveguide; The slab waveguide is used to guide the light beam received from the light source to the outcoupling grating, and to guide the imaging light beam to the optical fuser; The outcoupling grating is used to guide the light beam received from the light source to the imaging element, and to guide the imaging light beam generated by the imaging element into the slab waveguide.

8. The light field display device according to any one of claims 5 to 7, characterized in that: The imaging device further includes an imaging lens group, which is used to form a virtual image according to the imaging light beam emitted by the optical element, and to project the imaging light beam emitted by the optical element to the optical fuser.

9. The light field display device according to any one of claims 5 to 8, characterized in that: The imaging device further comprises a collimating lens assembly, wherein: The collimating lens group is arranged on the optical path between the optical element and the light source, and the collimating lens group is used to collimate the light beam emitted by the light source; or, The collimating lens group is arranged on the optical path between the optical element and the imaging element. The collimating lens group is used to collimate the light beam emitted by the light source from the optical element to the imaging element, and to collimate the imaging light beam emitted from the imaging element to the optical element.

10. The light field display device according to claim 1, wherein: There are multiple imaging elements, all of which are arranged in an array, and each of which is a micro-electromechanical system or a fiber scanner; Each of the imaging elements corresponds to one of the light sources, and each of the imaging elements is configured to generate an imaging light beam according to the light beam emitted by the corresponding light source.

11. The light field display device according to claim 10, characterized in that: All the imaging elements are arranged in an array along a first direction and a second direction; wherein the first direction is perpendicular to the second direction.

12. The light field display device according to claim 11, characterized in that All of the imaging elements are in an N*M array, wherein N and M are positive integers, and both N and M are greater than or equal to 3.

13. The light field display device according to any one of claims 1 to 12, characterized in that: The optical fusion device includes a polarization beam splitter and a semi-transparent and semi-reflective mirror; The polarization beam splitter is used to reflect the imaging light beam to the semi-transparent and semi-reflective mirror, and is used to transmit the imaging light beam reflected by the semi-transparent and semi-reflective mirror to the human eye; The polarized light splitter is also used to transmit the ambient light beam emitted from the semi-transparent and semi-reflective mirror into the human eye; The semi-transparent and semi-reflective mirror is used to reflect the received imaging light beam to the polarization beam splitter, and to transmit the ambient light beam to the polarization beam splitter.

14. The light field display device according to any one of claims 1 to 12, characterized in that: The optical fusion device includes a fusion device; The fusion device is used to transmit the imaging light into the human eye and to transmit the ambient light beam into the human eye; The fusion device is a semi-transparent and semi-reflective mirror, a holographic film or a super surface.

15. An augmented reality display device, characterized in that: comprising a controller and a light field display device according to any one of claims 1 to 14; The controller is used to control all the light sources in the light field display device to emit light in turn within a cycle, and is used to control the imaging element in the light field display device to generate multiple imaging light beams in turn according to the light beams emitted by the light sources within a cycle.

Images