Short focus nearsighted viewing system

Abstract

The short focus near-eye display system relates to the field of near-eye display technology and solves problems such as large viewing angle, large exit pupil diameter, and the contradiction between energy efficiency and volume that exist in traditional AR technology. The system includes a microdisplay (4), a convex partial reflector (2) or a flat partial reflector (17), and a concave partial reflector (3). The microdisplay (4) is located between the convex partial reflector (2) and the concave partial reflector (3), or the microdisplay (4) is located between the flat partial reflector (17) and the concave partial reflector (3), and emits light toward the pupil position (1). The convex partial reflector (2) or the flat partial reflector (17) is approaching the pupil position (1), and the concave partial reflector (3) is moving away from the pupil position (1). The microdisplay (4) is a transparent display or a rotating linear display. The two reflections optically increase the size of the microdisplay (4), making it easier to manufacture the microdisplay (4), reducing the precision required for rotation, and supporting higher resolution. By using the refraction effect of a plane mirror, the thickness of the glasses can be reduced to a minimum, making them lighter and thinner.

Description

[Technical field]

[0001] This application claims priority to a Chinese patent application for an invention titled "Short Focus Myopia Display System" filed on February 4, 2021 with the Patent Office of China, application number 202110154039.9, and a Chinese patent application for an invention titled "Short Focus Myopia Display System" filed on July 1, 2021 with the Patent Office of China, application number 202110746124.4, the entire contents of which are incorporated herein by reference.

[0002] FIELD OF THE DISCLOSURE This application relates to the field of near-eye viewing technology, and in particular to short focus near-eye viewing systems. [Background technology]

[0003] Augmented reality (abbreviated as AR) is called the third generation computing platform, which can magnify the image on a micro display by using small-volume glasses, provide users with an ultra-large 3D screen, and allow the displayed image to be integrated with the real environment. It has been widely applied in both daily life and industrial fields.

[0004] At present, there are various AR technologies, including free-form prisms, off-axis reflection structures, and waveguide glasses, but due to various constraints, none of them can solve the contradictions between large viewing angle, large exit pupil diameter, energy efficiency and volume. Summary of the Invention [Problem to be solved by the invention]

[0005] This application provides a short focus near-eye display system that solves the problems of large viewing angle, large exit pupil diameter, and the trade-off between energy efficiency and volume that exist in conventional AR technology. [Means for solving the problem]

[0006] A short focus near-eye display system, comprising: a microdisplay, a convex partial reflector or a flat partial reflector, and a concave partial reflector; the microdisplay is located between the convex partial reflector and the concave partial reflector; or the microdisplay is located between the flat partial reflector and the concave partial reflector; the convex partial reflector or the flat partial reflector is closer to a pupil position, and the concave partial reflector is farther away from the pupil position; the microdisplay is arranged as a transparent display or a rotating linear display; and emits light toward the pupil position, the emitted light is first reflected by the convex partial reflector or the flat partial reflector, the reflected light is reflected by the concave partial reflector, and the reflected light passes through the convex partial reflector or the flat partial reflector before reaching the pupil position. death, The surface shapes and relative positions of the convex partial reflector, the concave partial reflector, and the micro display are arranged to accommodate the myopia of the user, and the convex partial reflector and the concave partial reflector are arranged to be able to transmit a portion of light. R, It is a short focus near-eye display system.

[0007] 1. A short focus near-eye display system, comprising: a microdisplay; a convex partial reflector; and a concave partial reflector; The microdisplay is arranged as a rotating linear display or a transparent display, and emits light toward the pupil position. When the microdisplay is arranged as a rotating linear display, a transparent protective case is arranged on the outside of the microdisplay; the convex partial reflector and the concave partial reflector are disposed in this order between the pupil position and a microdisplay, The light emitted by the micro display passes through a concave partial reflector, is reflected by a convex partial reflector, and then the light is reflected by the concave partial reflector and passes through the convex partial reflector before reaching a pupil position. Reached , The surface shapes and relative positions of the convex partial reflector, the concave partial reflector, and the micro display are arranged to accommodate the myopia of the user, and the convex partial reflector and the concave partial reflector are arranged to be able to transmit a portion of light. R, It is a short focus near-eye display system. Effect of the Invention

[0008] The beneficial effects of the present application are as follows: The present application provides a short focus near-eye display system, which can reduce the overall thickness of the glasses, increase the exit pupil diameter, make the glasses more comfortable to wear for users, and be more aesthetically pleasing.

[0009] The two reflections allow the size of the microdisplay to be increased optically, making the microdisplay less difficult to manufacture, reducing the precision required for rotation, and supporting higher resolution.

[0010] By using the refractive effect of a plane mirror, the thickness of the glasses can be reduced to a maximum extent, making them lighter and thinner.

[0011] In this application, the position of the microdisplay can be shifted back and forth to achieve a zoom function, and the surface curvature of one of the mirrors can be adjusted to accommodate the wearer's prescription.

[0012] Finally, the display of the present application emits light toward the human eye, reducing leakage of displayed information. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a ray diagram of one surface reflection scheme of a partially reflecting mirror of the short focus near eye viewing system described in the present application. [Diagram 2] FIG. 2 is a light path diagram of another surface reflection type partial reflector of a short focus near-eye display system different from that of FIG. 1. [Diagram 3] FIG. 2 is a light path diagram of a flat display employed in the short focus near eye viewing system described herein. [Figure 4] 1 is a ray diagram of a short focus near eye viewing system in which a planar partially reflecting mirror as described herein is employed. [Diagram 5] FIG. 1 is a diagram illustrating the configuration of a transparent display. [Figure 6] FIG. 2 is an assembly schematic diagram of a transparent display employed in the short focus near eye viewing system described herein. [Figure 7] FIG. 1 is a basic configuration diagram when the microdisplay is a linear display. [Figure 8] This is a diagram illustrating the principle of joining multiple linear displays into a linear display. [Figure 9] FIG. 1 is an assembly schematic diagram of a linear display employing magnetic confinement. [Figure 10] FIG. 1 is an assembly schematic diagram of a linear display using a sliding bearing. [Figure 11] FIG. 1 is an assembly schematic diagram using a linear display and employing magnetic containment. [Figure 12] FIG. 1 is an assembly schematic diagram showing a case where a flat partial reflector is used and a sliding bearing is adopted. [Figure 13] This is an arrangement of permanent magnets on a rotating ring. [Figure 14] The permanent magnets on the rotating ring are arranged in a halbach array. [Figure 15] FIG. 3 is a schematic diagram of the short focus near eye display system shown in FIG. 2 with the addition of a phase retardation waveplate and a deflection device. [Figure 16] FIG. 5 is a schematic diagram of the short focus near eye display system shown in FIG. 4 with the addition of a phase retardation waveplate and a deflection device. [Figure 17] FIG. 2 is a schematic diagram of the polarization change of the optical path when a phase retardation waveplate is added to the short focus near eye display system shown in FIG. 1. [Figure 18] 2 is a schematic diagram of another optical path polarization change when a phase retardation waveplate is added to the short focus near-eye display system shown in FIG. 1. FIG. [Figure 19] FIG. 2 is a schematic diagram of the short focus near eye display system shown in FIG. 1 with the addition of a front dynamic occluder. [Figure 20]FIG. 13 is a light path diagram of a third type of microdisplay described in the present application bonded to the outer surface of a concave partially reflecting mirror. [Figure 21] FIG. 13 is a ray diagram with a gap between the microdisplay and the outer surface of the concave partially reflecting mirror. [Figure 22] This is a light path diagram in which a microdisplay is arranged on the outside as a flat display. [Diagram 23] FIG. 21 is a schematic diagram of the short focus near eye display system shown in FIG. 20 with the addition of a phase retardation waveplate and a deflection device. [Figure 24] This is a schematic diagram of a strip-shaped reflector being used and rotated simultaneously with a microdisplay. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] In this application, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood to indicate or imply the relative importance, or the quantity, order, of the indicated technical features. Thus, a feature qualified as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of this application, "plurality" means at least two, e.g., two, three, etc., unless expressly and specifically limited.

[0015] In this application, the terms "including" and "having" and any variations thereof are intended to cover a non-exclusive inclusion, for example, a system, product or facility that includes a set of units is not limited to those explicitly recited, but may include other units that are not explicitly recited or that are inherent to those products or facilities.

[0016] In this application, unless otherwise specified and limited, the terms "attached", "coupled", "connected", "fixed" and the like should be understood in a broad sense, for example, may be fixedly connected, detachably connected, or integrated, may be mechanically connected, may be electrically connected or communicated with each other, may be directly connected, or may be indirectly connected through an intermediate medium, and may allow internal communication between two elements or an interactive relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific situation.

[0017] As a specific embodiment 1, this embodiment will be described with reference to Figs. 1 to 19. As shown in Fig. 1, the short focus near-eye display system is mainly composed of a micro display 4, a convex partial reflector 2, and a concave partial reflector 3, and the micro display 4 is located between the convex partial reflector 2 and the concave partial reflector 3, and emits light toward the eye. The micro display 4 may be a transparent display 4a or a rotating linear display 4b. The partial reflector approaching the eye is a convex mirror, and the partial reflector away from the eye is a concave mirror. The micro display 4 emits light on the concave side, which is reflected by one surface of the convex partial reflector 2, i.e., the inner surface 2-1 of the convex partial reflector or the outer surface 2-2 of the convex partial reflector, passes through the micro display 4, and is reflected by the concave partial reflector 3 and passes through the micro display again. Since the convex partial reflector 2 can transmit light at the same time, the reflected light passes through the convex partial reflector 2 and reaches the pupil position 1 for human viewing. When the light emitted by the micro display 4 is reflected twice, it realizes the effect of magnifying and telephoto. Preferably, in order to realize uniform clarity of the displayed image, the convex partial reflector 2, the concave partial reflector 3 and the micro display 4 are distributed on a concentric sphere, and the center of the sphere is the center of the pupil position 1. Since the human eye has a zoom adjustment function, a certain degree of movement of the position of each component or deformation of the surface shape is allowed, and the additional function of such movement is to adapt to myopia power and realize dynamic zoom. As an example, the following table shows one of the optical design parameters.

[0018] [Table 1]

[0019] As shown in Figure 2, one surface of the convex partially reflecting mirror 2 is plated with a reflective film and participates in the generation of the virtual image, while the curvature of the other surface can be changed to provide a surface for correcting myopia, thereby adapting to the user's power. The two surfaces of the concave reflecting mirror can be similarly treated to adjust the power.

[0020] A partially reflective film layer is plated on one surface of the concave partially reflecting mirror 3, and is usually called a reflective filter film, and the film layer is designed according to the emission wavelength of the microdisplay 4. For example, the partially reflective film layer has a high reflectance for the central wavelength of the emission of the microdisplay 4, for example, reflecting more than 90%, while having a high transmittance for wavelength ranges other than the central wavelength of the emission, for example, transmitting 90%. Such a design can improve the brightness of the ambient light. The reflective filter film may be a dielectric film layer, a dielectric metal composite film layer, a holographic film layer, and a microstructure film layer.

[0021] As shown in FIG. 3, the microdisplay 4 is a flat microdisplay, and the flat microdisplay 4c is located between the convex partial reflector 2 and the concave partial reflector 3, and emits light toward the eye. The flat microdisplay 4c may be a flat transparent display or a rotating linear display. Since the shape is flat, it is easy to process under the conditions of the conventional technology. The partial reflector approaching the eye is a convex mirror, and the partial reflector away from the eye is a concave mirror. The flat microdisplay 4c emits light to the convex partial reflector 2, and is reflected by one surface of the convex partial reflector 2, i.e., the convex partial reflector inner surface 2-1 or the convex partial reflector outer surface 2-2, and then reflected by the concave partial reflector 3 after passing through the flat microdisplay 4. Since the convex partial reflector 2 can transmit light at the same time, the reflected light beam passes through the convex partial reflector 2 and reaches the pupil position 1 so that it can be seen by the human eye. The light emitted by the flat micro-display 4c is reflected twice to realize the effect of magnifying and telephoto. Due to the use of the flat micro-display 4c, the overall configuration of the optical path does not have spherical symmetry. In order to realize asymmetric correction, at least one of the convex partial reflector 2 and the concave partial reflector 3 is preferably aspheric. Since the human eye has a zoom accommodation function, a certain degree of movement of the position of each component or deformation of the surface shape is allowed, and the additional function of such movement is to adapt to myopia power and realize dynamic zoom. As an example, the following table shows the design parameters when two of the optical surfaces are both even-order aspheric surfaces.

[0022] [Table 2]

[0023] One surface of the convex partial reflector 2 is plated with a reflective film and participates in the generation of the virtual image, while the curvature of the other surface can be changed to provide a surface for correcting myopia, thereby adapting to the user's power. The two surfaces of the concave reflector can be similarly treated to adjust the power.

[0024] A partially reflective film layer is plated on one surface of the concave partial reflector 3, and is usually called a reflective filter film. The film layer is designed according to the wavelength of the light emitted by the microdisplay 4, and has a high reflectance, for example, more than 90%, for the central wavelength of the light emitted by the microdisplay 4, while having a high transmittance, for example, 90% transmittance, for wavelengths other than the central wavelength of the light emitted. Such a design can improve the brightness of the ambient light. The reflective filter film can be a dielectric film layer, a dielectric metal composite film layer, a holographic film layer, and a microstructure film layer.

[0025] As shown in Figure 4, The short focus near-sighted viewing system is The display is composed of a micro display 4, a planar partial reflector 17, and a concave partial reflector 3, and the micro display 4 is located between the planar partial reflector 17 and the concave partial reflector 3, and emits light toward the eye. The micro display 4 may be a transparent display 4a or a rotating linear display 4b. The partial reflector approaching the eye is a planar mirror, and the partial reflector away from the eye is a concave mirror. The micro display 4 emits light from the convex side, and is reflected by one surface of the planar partial reflector 17, i.e., the planar partial reflector inner surface 17-1 or the planar partial reflector outer surface 17-2. Some of the light passes through the display part of the micro display 4, and some of the light passes through the edge part of the micro display 4, is reflected by the concave partial reflector 3, and passes through the micro display screen again. Since the planar partial reflector 17 can transmit light at the same time, the reflected light passes through the planar partial reflector 17 and reaches the pupil position 1 so that it can be seen by the human eye. The light emitted by the micro display 4 is reflected by the concave partial reflector 3, thereby realizing the effect of magnifying and telephoto.

[0026] In this embodiment, in order to achieve uniformity in the clarity of the displayed image, the concave partial reflector 3 is spherical, and its center is aligned with the center of the pupil position 1. The micro-display 4 is also distributed on a spherical surface, and after the flat partial reflector 17 unfolds its mirror surface, the center of the sphere is also aligned with the center of the pupil position 1. Since the human eye has a zoom adjustment function, a certain degree of movement of the position of each component or deformation of the surface shape is allowed. The additional function of such movement is to adapt to myopia power and realize dynamic zoom. As an example, one of the optical design parameters is shown in the table below.

[0027] [Table 3]

[0028] One surface of the planar partial reflector 17 is plated with a reflective film and participates in the generation of the virtual image, while the other surface can be modified in curvature to become a myopia correction surface, thereby adapting to the user's power. The two surfaces of the concave reflector can be similarly treated to adjust the power.

[0029] A partially reflective film layer is plated on one surface of the concave partial reflector 3, and is generally called a reflective filter film. The film layer is designed according to the emission wavelength of the microdisplay 4, and has a high reflectance for the central wavelength of the emission of the microdisplay 4, for example, reflecting more than 90%, while having a high transmittance for wavelengths other than the central wavelength of the emission, for example, transmitting 90%. Such a design can improve the brightness of the ambient light. The reflective filter film may be a dielectric film layer, a dielectric metal composite film layer, a holographic film layer, and a microstructure film layer.

[0030] As shown in FIG. 5, when the micro display 4 is a transparent display 4a, the structure is generally composed of a transparent protective layer 4a-1, a transparent light-emitting pixel layer 4a-2, and a transparent driving layer 4a-3, and a dynamic light-shielding layer 4a-4 can be added to prevent stray light. The transparent protective layer 4a-1 is generally made of transparent glass or resin. The transparent light-emitting pixel may be composed of OLED, Micro-LED, etc., and can also be realized by a liquid crystal control method. The transparent driving layer 4a-3 is composed of a driving unit manufactured in an array by a transparent conductive material such as ITO, carbon nanotube, and graphene. There are also a plurality of pixels on the dynamic light-shielding layer 4a-4, and gray scale adjustment is realized by a dye liquid crystal, electrowetting, etc., to block the light emitted by the light-emitting pixel toward the human eye. The pixels on the dynamic light-shielding layer 4a-4 may be much larger than the light-emitting pixels, for example, circular pixels with a diameter of 0.5mm to 2mm, or elongated pixels with a diameter of 0.5mm*20mm. The purpose is to block light emission, so if the pixel size is smaller than the pupil of the human eye in one direction, it can ensure that the light enters the human eye. Of course, it is preferable to keep it below 0.5mm, so that more light can enter the human eye. When the flat micro display 4c is a transparent display, its configuration is the same as that of the transparent display 4a, but the difference is that its shape is flat. As shown in FIG. 6, a transparent display outer holder 4a-5 is provided on the edge of the transparent display screen, which is convenient for assembly with a mirror frame. In addition, a convex partial reflector extension end 2-3 is provided on the edge of the convex partial reflector 2, and this extension end can form an airtight space together with the concave partial reflector 3 and the mirror frame, which has the effect of preventing dust.In addition, by filling the airtight space with nitrogen gas or an inert gas or creating a vacuum, it is possible to prevent oxidation of internal devices and extend their service life.

[0031] As shown in FIG. 7, FIG. 7 is a schematic diagram of a linear display, in which one or more rows of light-emitting pixels 4b-1 are distributed on a driving and arc-shaped holder 4b-2, and the overall width should not exceed the diameter of the pupil of the human eye, and the narrower the better. As shown in FIG. 8, in consideration of the difficulty of processing the arc-shaped, the entire linear display 4b can be configured by a method in which multiple linear display units 4b-3 are joined together. FIG. 8 shows one of the joining methods, and a complete screen can be formed as a whole by combining the upper and lower halves. The advantage is that there is a non-display area 4b-4 between the linear display units 4b-3, and the area of ​​the non-display area 4b-4 can also be used to install a driving circuit. The joining position of two adjacent linear display units 4b-3 can generally secure a display overlap area 4b-5 in advance, and compensate for assembly errors. The flat micro display 4c rotates straight In the case of a linear display, its configuration is the same as that of the linear display 4b, but the difference is that its shape is linear, and therefore the segment arrangement method as shown in FIG. 8 is not required.

[0032] As shown in FIG. 9, FIG. 9 is a schematic diagram of the rotation structure of the linear display, in which a rotation small hole is provided on the side facing the central light-emitting pixel 4b-1 of the linear display 4b, the size of which is generally 0.2 to 1 mm, and a thin shaft 18 is fixed to the center of the concave partial reflecting mirror 3, and the diameter of the thin shaft 18 is matched with the small hole so as to limit the radial movement of the linear display 4b, so that the linear display 4b can rotate around the axis. A rotation holder 21 can be installed in front of the concave partial reflecting mirror 3, and the thin shaft 18 is fixed to the center thereof, and the rotation holder may be a lens or a metal strip made of a transparent material. Because the length of the central axis is short, the minute gap between the thin shaft 18 and the small hole causes the linear display 4b to swing in the axial direction, and a magnetic constraint method can be adopted to limit this swing. An inner magnetic ring 10 is fixed to the outside of the rotating ring 4b-6, and the inner magnetic ring 10 rotates together with the rotating ring 4b-6. An outer magnetic ring 12 is fixed on the mirror frame outside the inner magnetic ring 10, and the inner magnetic ring 10 and the outer magnetic ring 12 form concentric circles, and there is an air gap between them to prevent friction. When the inner magnetic ring 10 and the outer magnetic ring 12 have the opposite magnetization direction, they form a magnetic confinement, and there is a force that holds them in the same plane. When a pulse motor is used, the magnetic bodies on the rotating ring are all arranged in the same direction, so that a similarly stable structure can be formed in combination with the outer magnetic ring 12, and the inner magnetic ring 10 can be omitted in this case. A driving coil or PCB is provided on the left or right side of the rotating ring 4b-6, which is fixed on the mirror frame. The driving coil or PCB can rotate the rotating ring 4b-6 and wirelessly supply power to the linear display 4b.

[0033] As shown in Figure 10, it is a schematic diagram of another type of rotating structure. A sliding ring 16 is fitted on the outer ring of the rotating ring 4b-6, which has the characteristic of small friction resistance and is generally made of metal or Teflon, etc., and a constrained magnetic ring 19, a magnetic conductive ring 13, and a wear-resistant ring 14 are fixed on the mirror frame above the corresponding position. In addition, there is a lubricating gap 15 between the wear-resistant ring 14 and the sliding ring 16. The principle of this structure is that the constrained magnetic ring 19 transmits the magnetic field to the periphery of the lubricating gap 15 through the magnetic conductive ring 13, and when the lubricating gap 15 is filled with magnetic fluid, it can form a liquid lubrication, and the magnetic fluid cannot leak out due to the constraint of the magnetic force, forming a stable sealed structure.

[0034] As shown in FIG. 11, a rotating small hole is provided on the side facing the central light-emitting pixel of the flat micro-display 4c, and the size of the small hole is generally 0.2-1 mm. A rotating holder 21 is arranged on the side approaching the concave partial reflecting mirror 3, and a thin shaft 18 is fixed to the center of the rotating holder 21. The diameter of the thin shaft 18 is matched with the small hole so as to limit the radial movement of the flat micro-display 4c, and the flat micro-display 4c can rotate around the axis. Because the length of the central axis is short, the minute gap between the thin shaft 18 and the small hole causes the flat micro-display 4c to swing in the axial direction, and a magnetic constraint method can be adopted to limit this swing. The tip of the flat micro-display 4c is connected to the flat micro-display extension end 4c-1, and the flat micro-display extension end 4c-1 is fixedly connected to the flat micro-display rotation ring 4c-2. An inner magnetic ring 10 is fixed to the outside of the flat micro display rotating ring 4c-2, and the inner magnetic ring 10 rotates together with the flat micro display rotating ring 4c-2. An outer magnetic ring 12 is fixed on the mirror frame outside the inner magnetic ring 10, and the inner magnetic ring 10 and the outer magnetic ring 12 form concentric circles, and there is an air gap between them to prevent friction. When the inner magnetic ring 10 and the outer magnetic ring 12 have the opposite magnetization direction, they form a magnetic confinement, and there is a force that keeps them in the same plane. When a pulse motor is used, the magnetic bodies on the rotating ring are all arranged in the same direction, so that they can be combined with the outer magnetic ring 12 to form a similarly stable structure, and the inner magnetic ring 10 can be omitted in this case.

[0035] A central permanent magnet 23 can be arranged on the side of the thin shaft 18 that is closer to the flat micro-display 4c, and there is generally a certain central gap 22 between the central permanent magnet 23 and the thin shaft 18, and when this central gap 22 is filled with magnetic fluid, it can provide a lubricating effect.

[0036] As shown in FIG. Schematic diagram of a short-focus near-eye display system using a flat partially reflecting mirrorThe outer ring of the rotating ring 4b-6 is fitted with a sliding ring 16, which has a characteristic of low friction resistance and is generally made of metal or Teflon, etc., and a constrained magnetic ring 19, a magnetic conductive ring 13, and a wear-resistant ring 14 are fixed on the mirror frame above the corresponding position, and a lubricating gap 15 is formed between the wear-resistant ring 14 and the sliding ring 16. The principle of this structure is that the constrained magnetic ring 19 transmits a magnetic field to the periphery of the lubricating gap 15 through the magnetic conductive ring 13, and when the lubricating gap 15 is filled with magnetic fluid, a liquid lubrication can be formed, and the magnetic fluid cannot leak out due to the constraint of the magnetic force, forming a stable sealed structure. Similar to the structure shown in Figure 20, a rotating holder 21 can also be added to rotate around the central axis.

[0037] The enclosed space formed by the convex partial reflector 2, the concave partial reflector 3, and the mirror frame can be filled with nitrogen gas or an inert gas to prevent oxidation, thereby improving durability, and creating a vacuum can further reduce rotational resistance.

[0038] As shown in FIG. 13, the arrangement of the permanent magnets on the rotating ring 4b-6 or the flat micro display rotating ring 4c-2 may be an NS alternating arrangement. As shown in FIG. 14, the arrangement of the permanent magnets on the rotating ring 4b-6 or the flat micro display rotating ring 4c-2 may be a halbach array arrangement. Motors adopting the above two types of arrangements generally belong to the category of brushless DC motors. Driving and power supply coils or PCBs 11 are arranged at the corresponding positions on the left or right side of the rotating ring, which can drive the rotation of the rotating ring with power and simultaneously supply power to the micro display.

[0039] With the above design, the optical system described in this embodiment can reduce the overall thickness of the glasses and increase the exit pupil diameter, making the glasses more comfortable to wear and more aesthetically pleasing for users. The two reflections can optically increase the size of the microdisplay, reducing the manufacturing difficulty of the microdisplay, reducing the precision required for rotation, and supporting higher resolution.

[0040] In this embodiment, the optical path is folded to make the overall structure of the optical system thinner and improve comfort, while also providing a low-friction, stable rotation method.

[0041] As shown in Figures 15 and 16, in this embodiment, a phase retardation wave plate, a polarizing element and a dynamic light shield are added, the phase retardation wave plate generally includes a quarter wave plate and a half wave plate, and the polarizing element mainly includes an absorption type polarizing plate, a metal wire grid polarizing plate and a dielectric film polarizing plate, etc. The cooperation of the phase retardation wave plate and the polarizing element can improve the utilization rate of light energy and reduce stray light interference.

[0042] A phase retardation wave plate 5 is added between the convex partial reflector 2 or the flat partial reflector 17 and the micro display 4, or a phase retardation wave plate 5 is added between the micro display 4 and the concave partial reflector 3.

[0043] A phase retardation wave plate 5 can further be arranged between the microdisplay 4 and the concave partial reflector 3, and the phase retardation wave plate 5 can be attached to the concave partial reflector 3, and a phase retardation wave plate 5 can also be inserted between the microdisplay 4 and the convex partial reflector 2 or the planar partial reflector 17, and the phase retardation wave plate 5 can be attached to the convex partial reflector 2 or the planar partial reflector 17.

[0044] An outer polarizing element 8 can be attached to the concave partial reflector 3 and an inner polarizing element 9 can be attached to the convex partial reflector 2 .

[0045] A front dynamic light blocking layer 20 is arranged on one side of the convex partial reflector 2 or the plane partial reflector 17 .

[0046] As shown in Figure 17, this is a diagram of the optical path principle when the phase retardation waveplate 5 is located between the concave partial reflector 3 and the micro display 4. The micro display 4 emits the first p linearly polarized light 7a-1, and the convex partial reflector 2 is plated with a film layer that reflects p light and transmits s light. The reflected light is still the second p linearly polarized light 7a-2, and after passing through the phase retardation waveplate 5, it changes to the first circular or elliptical polarized light 7a-3, and after being reflected by the concave partial reflector 3, the light is still the second circular or elliptical polarized light 7a-4, and after passing through the phase retardation waveplate 5 again, it changes to the first s linearly polarized light 7a-5, which can maximally transmit the convex partial reflector 2 and enter the human eye, while avoiding the interference of stray light.

[0047] As shown in Figure 18, the optical path principle diagram when the phase retardation waveplate 5 is located between the convex partial reflector 2 and the micro display 4. The micro display 4 emits the third circular or elliptical polarized light 7b-1, which is changed to the third p linear polarized light 7b-2 after passing through the phase retardation waveplate 5, and the film layer reflecting p light and transmitting s light is plated on the convex partial reflector 2, and the reflected light is still the fourth p linear polarized light 7b-3, which is changed to the fourth circular or elliptical polarized light 7b-3 after passing through the phase retardation waveplate 5, and the light is still the fifth circular or elliptical polarized light 7b-4 after being reflected by the concave partial reflector 3, which is changed to the second s linear polarized light 7b-5 after passing through the phase retardation waveplate 5 again, and the light can be maximally transmitted through the convex partial reflector 2 and enter the human eye, and at the same time, the interference of stray light can be avoided.

[0048] An outer polarizing element 8 and an inner polarizing element 9 can be added on both sides of the system, and the polarization direction can be adjusted to eliminate stray light caused by ambient light and achieve a better effect. As shown in FIG. 19, a pre-positioned dynamic light shielding element 20 can be placed on the side of the convex partial reflector 2 or the flat partial reflector 17 close to the human eye, and its function is to block the light emitted by the microdisplay 4 that directly passes through the convex partial reflector 2 or the flat partial reflector 17. It is composed of grayscale pixels, and when the microdisplay 4 scans and emits light, the dynamic light shielding layer 20 can be in a black state at the position where the light emitted by the microdisplay passes directly through the convex partial reflector 2 or the flat partial reflector 17 and enters the human eye, and in a white state at other positions, thereby blocking the stray light that directly enters the human eye and improving the contrast of the image. The dynamic light shielding element 20 can be placed between the microdisplay 4 and the convex partial reflector 2. The pixel size must be smaller than the pupil of the human eye in at least one direction. It should be emphasized that the phase retardation wave plate 5, the outer polarizing element 8, the inner polarizing element 9 and the dynamic light blocking layer 20 are not limited in terms of surface type, and may be curved or flat.

[0049] In this embodiment, the addition of phase retardation waveplates, polarizers and dynamic light blockers can improve the utilization of light energy, increase brightness and reduce stray light interference.

[0050] This embodiment will be described as specific embodiment 2 with reference to Figures 20 to 24. The configuration and rotation method of the micro-display 4 of this embodiment are similar to those of specific embodiment 1, and will not be repeated here.

[0051] As shown in FIG. 20, the short focus near-eye display system is mainly composed of an outer micro display 4d or an outer flat micro display 4f, a convex partial reflector 2 and a concave partial reflector 3, and the outer micro display 4d or the outer flat micro display 4f is located on the outer side of the concave partial reflector 3 in a direction away from the human eye, and emits light toward the eye. As shown in FIG. 20, the position can be in close contact with the outer surface 3-2 of the concave partial reflector. As shown in FIG. 21 and FIG. 22, a certain distance, for example 3 mm, may be provided. The outer micro display 4d or the outer flat micro display 4f may be a transparent display or a rotating linear display, or may be a non-transparent display used for virtual reality. The partial reflector approaching the eye is a convex mirror, and the partial reflector away from the eye is a concave mirror. The outer micro-display 4d or the outer flat micro-display 4f emits light toward the human eye, and the light passes through the concave partial reflecting mirror 3 and is reflected by one surface of the convex partial reflecting mirror 2, i.e., the inner surface 2-1 of the convex partial reflecting mirror or the outer surface 2-2 of the convex partial reflecting mirror. The light is then reflected by the concave partial reflecting mirror 3, and since the convex partial reflecting mirror 2 can transmit light at the same time, the reflected light passes through the convex partial reflecting mirror 2 and reaches the pupil position 1 so that it can be seen by the human eye. When the light emitted by the outer micro-display 4d or the outer flat micro-display 4f is reflected by the convex partial reflecting mirror 2 and the concave partial reflecting mirror 3, it realizes the effect of magnifying and telephoto.

[0052] In this embodiment, in order to realize uniformity of clarity of the display image, the convex partial reflector 2, the concave partial reflector 3 and the outer micro-display 4d are distributed on a concentric sphere, and the spherical center position is the center of the pupil position 1. As shown in FIG. 22, when the outer flat micro-display 4f is used, in order to reduce the manufacturing difficulty of the outer micro-display 4d, the overall configuration of the optical path does not have spherical symmetry. In order to realize asymmetric correction, preferably, at least one of the convex partial reflector 2 and the concave partial reflector 3 is aspheric. A dynamic light shield 20 can be added in front of the outer flat micro-display 4f, and the outer flat micro-display 4f adjusts the front dynamic light shield black state pixel 20-1 in the optical path directly entering the human eye, thereby reducing the stray light 24 directly entering the human eye.

[0053] Since the human eye has a zooming accommodation function, some movement of each component position or deformation of the surface shape is allowed, and the additional function of such movement is to accommodate myopia power and to realize dynamic zoom. As an example, the optical parameters of one of the symmetrical designs are shown in the table below.

[0054] [Table 4]

[0055] One surface of the convex partial reflector 2 is plated with a reflective film and participates in the generation of a virtual image, while the curvature of the other surface can be changed to become a surface for correcting myopia to suit the user's power. The two surfaces of the concave reflector can be similarly treated to adjust the power, allowing the ambient light to clearly reach the human eye.

[0056] As shown in Fig. 23, when the outer micro-display 4d or the outer flat micro-display 4f described in this embodiment is located outside the concave partial reflector 3, an outer polarizing element 8 is arranged in front of the outer micro-display 4d or the outer flat micro-display 4f, and an outer phase retardation wave plate 5-2 is further arranged, and at the same time, an inner phase retardation wave plate 5-1 can be further added between the convex partial reflector 2 and the concave partial reflector 3. Each phase retardation wave plate can be attached to the surface of the convex partial reflector 2 and the concave partial reflector 3. The phase retardation wave plate, the polarizing element and the dynamic light shield are all for achieving better effects, but are not essential devices.

[0057] The following table shows a design parameter table that applies when the virtual image distance is 2 mm, there is ambient light, there is no diopter, and there is no myopia power.

[0058] [Table 5]

[0059] As shown in FIG. 24, in order to improve the utilization rate of light energy and reduce stray light interference, a strip-shaped concave reflector 25 can be used, and a film layer with a certain reflectivity is plated on the front surface 25-1 of the strip-shaped concave reflector or the back surface 25-2 of the strip-shaped concave reflector, and the width is generally 1mm to 10mm. The strip-shaped concave reflector 25 and the outer micro-display 4d are fixedly connected and rotate together. An outer transparent protective case 26 is provided on the outside of the outer micro-display 4d, which is fixedly connected to the mirror frame. A small rotating hole is provided on the display screen holder 27 of the outer micro-display 4d, and the dimension of the small rotating hole is generally 0.2 to 5mm. A thin shaft 18 is fixed to the center of the outer transparent protective case 26, and the diameter of the thin shaft 18 is set to 1 / 2 mm, which is equal to or larger than 1 / 2 mm, and the diameter of the thin shaft 18 is set to 1 / 2 mm, which is equal to or larger than 1 / 2 mm. limitThe outer micro display 4d can rotate around the axis by fitting the small hole so that the small hole is rotated. Because the length of the central axis is short, the small gap between the thin shaft 18 and the small hole causes the outer micro display 4d to swing in the axial direction. In order to restrict this swing, a method of constraint by magnetic force can be adopted. The inner magnetic ring 10 is fixed to the outside of the outer micro display rotating ring 4d-1, and the inner magnetic ring 10 rotates together with the outer micro display rotating ring 4d-1. The outer magnetic ring 12 fixed on the mirror frame is provided outside the inner magnetic ring 10, and the inner magnetic ring 10 and the outer magnetic ring 12 form concentric circles, and there is an air gap between them to prevent friction. When the inner magnetic ring 10 and the outer magnetic ring 12 have the opposite magnetization direction, a magnetic confinement is formed, and there is a force that holds them in the same plane. When a pulse motor is used, the magnetic bodies on the rotating ring are all arranged in the same direction, so that a similarly stable structure can be formed in combination with the outer magnetic ring 12, and the inner magnetic ring 10 can be omitted in this case. A driving coil or PCB is provided on the left or right side of the outer micro-display rotating ring 4d-1, which is fixed on the mirror frame. The driving coil or PCB can rotate the outer micro-display rotating ring 4d-1 and wirelessly power the linear display 4b. A central permanent magnet 23 can be disposed on the side of the thin shaft 18 that is closer to the outer micro-display 4d. There is generally a certain central gap 22 between the central permanent magnet 23 and the thin shaft 18. When the central gap 22 is filled with magnetic fluid, it can function as a lubricant.

[0060] As described above, the method of using a strip-shaped reflecting mirror and rotating it simultaneously with the microdisplay can also be applied to the first embodiment.

[0061] The advantage of this embodiment is that the light does not need to pass through the outer micro-display 4d or the outer flat micro-display 4f multiple times, and when the micro-display has a certain absorption, the loss of light energy caused by passing through the outer micro-display 4d or the outer flat micro-display 4f multiple times can be avoided. In addition, a phase retardation wave plate and a polarizing element can be arranged between the outer micro-display 4d or the outer flat micro-display 4f and the concave partial reflector 3, which improves the degree of freedom.

[0062] The technical features of the above-mentioned embodiments can be combined in any combination. For the sake of brevity, a description has not been given of all possible combinations of the technical features in the above-mentioned embodiments, but as long as there is no contradiction in the combinations of these technical features, they should all be considered within the scope of the present specification.

[0063] The above examples only represent some embodiments of the present application, and the description is relatively specific and detailed, but this should not be understood as a limitation on the scope of the claims. Furthermore, those skilled in the art may make some modifications and improvements without departing from the concept of the present application, all of which are within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application is based on the appended claims. [Explanation of symbols]

[0064] 1 Pupil position 2 Convex partial reflector 2-1 Inner surface of convex partial reflector 2-2 Convex partial reflector outer surface 2-3 Convex partial reflector extended end 3 Concave partial reflector 3-1 Inner surface of concave partial reflector 3-2 Outer surface of concave partial reflector 4. Microdisplay 4a Transparent display 4a-1 Transparent protective layer 4a-2 Transparent light-emitting pixel layer 4a-3 Transparent driving layer 4a-4 Dynamic light shielding layer 4a-5 Transparent display outer holder 4b Linear display 4b-1 Light-emitting pixel 4b-2 Drive and arched holder 4b-3 Linear display unit 4b-4 No display area 4b-5 Display superimposition area 4b-6 Rotating Ring 4b-6-1 Rotating ring S pole outer permanent magnet 4b-6-2 Rotating ring N pole outer permanent magnet 4b-6-3 Rotating ring with outward facing permanent magnets 4b-6-4 Rotating ring with inward facing permanent magnets 4b-6-5 Rotating ring clockwise permanent magnet 4b-6-6 Rotating ring, counterclockwise permanent magnet 4c Flat Micro Display 4c-1 Flat microdisplay extension end 4c-2 Flat micro display rotating ring 4d outer micro display 4d-1 Outer micro display rotating ring 4f Outer Flat Micro Display 5 Phase retardation wave plate 5-1 Inner phase retardation wave plate 5-2 Outer phase retardation wave plate 6 Polarizing Polarizer 7 rays 7a-1 1st p linear polarization 7a-2 2nd p linear polarization 7a-3 First circularly or elliptically polarized light 7a-4 Second circularly or elliptically polarized light 7a-5 1st linear polarization 7b-1 Third circular or elliptical polarization 7b-2 3rd p linear polarization 7b-3 4th circular or elliptically polarized light 7b-4 5th circular or elliptically polarized light 7b-5 2nd s linear polarization 8 Outer polarizing element 9 Inner polarizing element 10 Inner magnetic ring 11 Driving and power supply coil or PCB 12 Outer magnetic ring 13 Magnetic Conductive Ring 14 Wear-resistant ring 15 Lubrication gap 16 Slide ring 17 Planar partial reflector 17-1 Plane partial reflector outside 17-2 Inside of flat partial reflector 18 Thin shaft 19 Binding Magnetic Ring 20 Dynamic shader 20-1 Front Dynamic Shader Black State Pixel 21 Rotating holder 22 Center gap 23 Center permanent magnet 24 Stray Light 25 Strip-shaped concave reflector 25-1 Front of strip-shaped concave reflector 25-2 Back side of strip-shaped concave reflector 26 Outer transparent protective case 27 Display Screen Holder

Claims

1. 1. A short focus near-eye display system, comprising: The present invention includes a microdisplay (4), a convex partial reflector (2) or a flat partial reflector (17), and a concave partial reflector (3), the microdisplay (4) being located between the convex partial reflector (2) and the concave partial reflector (3), or the microdisplay (4) being located between the flat partial reflector (17) and the concave partial reflector (3), the convex partial reflector (2) or the flat partial reflector (17) approaching the pupil position (1) and the flat partial reflector (17) moving away from the pupil position (1). is a concave partial reflector (3), the microdisplay (4) is arranged as a transparent display or a rotating linear display, and emits light toward the pupil position (1), the emitted light beam is first reflected by the convex partial reflector (2) or the flat partial reflector (17), the reflected light beam is reflected by the concave partial reflector (3), and the reflected light beam passes through the convex partial reflector (2) or the flat partial reflector (17) before reaching the pupil position (1); The surface shapes and relative positions of the convex partial reflector (2), the concave partial reflector (3) and the micro display (4) are arranged to accommodate the user's myopia power, and the convex partial reflector (2) and the concave partial reflector (3) are arranged to be able to transmit a portion of light.

2. The short focus near-eye display system of claim 1, characterized in that the surface of the convex partial reflector (2) has an optical film layer, which can reflect p-linearly polarized light and transmit s-linearly polarized light, and the surface of the concave partial reflector (3) is plated with an optical film layer, which has the highest reflectance for the emission wavelength of the pixel of the microdisplay (4) and the highest transmittance for wavelengths other than the emission wavelength of the microdisplay (4).

3. The short focus near-eye display system of claim 1, characterized in that the linear display can be constructed by connecting multiple linear micro display units (4b-3), a non-display area (4b-4) is provided between adjacent linear display units (4b-3), and a display overlap area (4b-5) is previously secured at the connecting position of two adjacent linear display units (4b-3).

4. A rotating ring (4b-6) is connected to the edge of the linear display, and a thin shaft (18) is fixed to the center of the partial reflector (3), thereby restricting radial movement of the linear display (4b), and the linear display (4b) rotates around the thin shaft; An inner magnetic ring (10) is fixed to the outside of the rotating ring (4b-6), and an outer magnetic ring (12) fixed to a mirror frame is provided outside the inner magnetic ring (10). The inner magnetic ring (10) and the outer magnetic ring (12) form concentric circles with an air gap between them, thereby preventing friction and forming magnetic confinement. The short focus near-eye display system according to claim 1, characterized in that a driving coil or PCB (11) is provided on a mirror frame corresponding to the left or right side of the rotating ring (4b-6), and the driving coil or PCB (11) is arranged to rotate the rotating ring (4b-6) and to wirelessly supply power to the linear display (4b).

5. The short focus near-eye display system according to claim 1, characterized in that: a sliding ring (16) is fitted on the outer ring of the rotating ring (4b-6) of the linear display; a constrained magnetic ring (19), a magnetic conductive ring (13) and a wear-resistant ring (14) are fixed at corresponding positions on the mirror frame above the sliding ring (16); a lubricating gap (15) is formed between the wear-resistant ring (14) and the sliding ring (16); the constrained magnetic ring (19) transmits a magnetic field to the periphery of the lubricating gap (15) through the magnetic conductive ring (13); and the lubricating gap (15) is filled with magnetic fluid, thereby forming a stable sealed structure with liquid lubrication.

6. The short focus near-eye display system according to claim 1, characterized in that the enclosed space formed by the convex partial reflector (2), the concave partial reflector (3) and the mirror frame is filled with nitrogen gas or an inert gas, or is evacuated.

7. 7. The short focus near eye display system according to any one of claims 1 to 6, characterized in that the concave partial reflector (3) is a strip-shaped concave reflector and rotates synchronously with the microdisplay (4).

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