A light and thin near-eye display system

Abstract

This invention discloses a thin and light near-eye display system, including a frame, lenses, and a display component attached to the frame. The display component includes a micro / nano display screen, a light control module, and a projection module. The beam-shaping lens group in the light control module modulates the phase of the original beam emitted from the micro / nano display screen, compressing its divergence angle to below a preset angle, and shaping the beam cross-section into a flat beam with compressed width and maintained length, with an aspect ratio greater than a preset ratio. The projection module receives the flat beam, performs aberration correction and focusing, and then emits it. The display component is arranged along the edge or corner of the frame, and the optical central axes of the micro / nano display screen, the light control module, and the projection module are all located in the same reference plane. The flat beam propagates along a narrow channel within this reference plane before entering the human eye. This system maintains high optical efficiency while achieving side frame integration, avoiding the problems of extremely low light efficiency, large size, and central field of view obstruction in traditional solutions.

Description

Technical Field

[0001] This invention relates to the field of near-eye display technology, and in particular to a thin and light near-eye display system. Background Technology

[0002] Augmented reality (AR) is an interactive technology that integrates virtual information with the real world, aiming to provide users with enhanced perceptual experiences by overlaying computer-generated images onto the ambient light field. Currently, traditional solutions for realizing near-eye display optical combiners mainly include semi-transparent and semi-reflective mirrors, Birdbath structures, surface relief or volume holographic waveguides, etc.

[0003] However, existing technologies have significant technical drawbacks. While semi-transparent and reflective mirrors and Birdbath structures offer high luminous efficiency, they are bulky and typically must be positioned directly in front of the glasses or above the brow bone, severely obstructing the user's vertical field of vision and compromising portability and comfort. Although waveguide solutions are thin and lightweight, their reliance on diffraction results in extremely low optical efficiency and energy utilization during light propagation (only 1%-5%). This extremely high energy loss forces the front-end microdisplay (such as Micro-LED) to operate at extremely high brightness, leading to a surge in overall power consumption and severe heat generation, significantly shortening the device's battery life and posing a threat to the safety of wearable devices that are close to the brain.

[0004] Miniaturizing near-eye display systems and applying them to AR devices to fully utilize the ample space on the side bezels of glasses is a highly promising approach. However, placing them within the narrow (typically less than 15mm) side bezels of glasses increases the design complexity of the optical structure. How to overcome these physical space limitations and optical design bottlenecks within an extremely flat space has become a critical issue that needs to be addressed in this field. Summary of the Invention

[0005] In view of the aforementioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a thin and light near-eye display system, which aims to reduce the size of near-eye display devices while improving optical efficiency and energy utilization.

[0006] To achieve the above objectives, the present invention discloses a thin and light near-eye display system, the near-eye display system comprising: a frame, a lens disposed on the frame, and a display component attached to the frame; The display components include a micro-nano display screen, a light control module, and a projection module; The original beam emitted by the micro / nano display screen has a first divergence angle; The light control module includes a beam shaping lens group, which is configured to perform phase modulation on the original beam, compress the first divergence angle to a second divergence angle that is less than a preset angle, and simultaneously shape the beam cross-section into a flat beam whose width dimension is compressed and whose length dimension is maintained, wherein the aspect ratio of the flat beam is greater than a preset ratio. The projection module is disposed on the output light path of the light control module and is configured to receive the flat beam and perform aberration correction and focusing before outputting it; The display components are arranged on the edge or corner of the frame. The optical central axes of the micro-nano display, the light control module and the projection module are all located in the same reference plane. The flat beam propagates along the channel in the reference plane and enters the human eye.

[0007] Optionally, the display component and the frame can have an integrated or external configuration: In the integrated configuration, each module of the display component is integrally embedded inside the frame; In the external configuration, the display component is detachably attached to the edge or corner of the frame via a connecting mechanism.

[0008] Optionally, the emitted light from the projection module enters the interior of the lens and propagates from the edge region of the lens to the center region of the lens. After propagating to the reflective element disposed in the center region of the lens, it is reflected by the reflective element and emitted from the lens into the human eye. The reflective element includes at least one of a total reflection mirror, a semi-transparent mirror, a microelectromechanical system (MEMS) reflector, or a micro-reflection array.

[0009] Optionally, the lens includes a central main viewing area and an edge gradient area located between the central main viewing area and the edge of the lens frame; the reflective element is disposed in the central main viewing area; the edge gradient area has a continuously varying refractive index distribution along the width direction from the edge to the center, and the refractive index distribution is configured such that when the outgoing light from the projection module enters the edge gradient area at a preset incident angle, the light is continuously deflected within the edge gradient area, and when it enters the central main viewing area, its propagation direction is parallel to the surface tangent plane of the lens at the entry point.

[0010] Optionally, the micro-nano display screen includes one or more micro-nano display screens and corresponding driving circuits and driving power supplies; The micro-nano display screen is disposed on the upper and / or lower side of the lens frame, so that the emitted light path of the micro-nano display screen propagates along the extension direction of the lens frame side.

[0011] Optionally, the micro-nano display screen is selected from at least one of the following display technologies: Micro-LED, Micro-OLED, Mini-LED, Mini-OLED, LCD, DLP, LCOS, LED, and laser projection; When the system is configured for monochrome display, the micro-nano display screen includes a single monochrome micro-nano display screen; When the system is configured for color display, the micro / nano display screen is selected from one of the following two configurations: It consists of three monochrome micro-nano displays of red, green and blue, with the light emitted from each sub-screen being independently collimated and then combined into full-color light by a color combining element; or it consists of a single full-color micro-nano display.

[0012] Optionally, multiple sets of the micro-nano displays are respectively set at different positions of the frame, and the corresponding flat optical paths of each set are directly projected into the eye, and the images entering the eye are superimposed, spliced ​​or combined on the retina; The outgoing light rays of the flat optical path are incident at an angle relative to the visual axis of the human eye, with an angle of 20° to 45°.

[0013] Optionally, the micro-nano display screen includes three monochrome micro-nano display screens: red, green, and blue. The light emitted from each sub-screen is independently collimated and then incident on a cross-reflector to be combined into full-color light. The surface or interior of the cross-reflector is provided with a dichroic film layer, which is configured to selectively reflect light of different wavelengths or polarization states.

[0014] Optionally, the refractive index distribution of the edge gradient region satisfies the following relationship: in, The refractive index of the central main viewing area at the boundary of the edge gradient region is [value missing]. The width of the edge gradient region. The distance from the incident boundary of the edge gradient region along its width direction. And the preset incident angle Width of the edge gradient area satisfy: in, The offset of the center ray of the emitted beam from the projection module at the incident boundary of the edge gradient region along a direction perpendicular to the tangent plane of the lens surface; The propagation trajectory of light within the gradient region at the edge is described by the following formula: in, Let be the distance the light travels along the incident direction within the gradient region at the edge. For the distance of light propagation The vertical displacement of the point deviating from its incident direction, when hour, The light rays exit in a direction parallel to the tangent plane of the lens surface at the point of entry.

[0015] Optionally, the system further includes an eye-in-coupling module, which is a semi-transparent and semi-reflective component, and the semi-transparent and semi-reflective component is selected from at least one of the following: a single semi-transparent and semi-reflective mirror, a microelectromechanical system mirror, and a micro-reflective array; The reflective surface of the semi-transparent and semi-reflective component is selected from a plane or a curved surface, and the surface of the reflective surface is provided with at least one functional film layer selected from the following: metasurface film, holographic surface film, volume holographic surface film, and semi-transparent and semi-reflective film. The system is configured in at least one of the following functional modes: Eye box expansion mode: The system adjusts the overall tilt angle of the reflective surface of the semi-transparent and semi-reflective component through a fine-tuning mechanism, or adjusts the relative tilt angle and position of multiple micro-reflective surfaces in the micro-reflective array separately to deflect the light beam to different pupil positions. Multi-focal plane three-dimensional display mode: The system changes the focal length of the light beam through an internally integrated variable focal length optical component, so that the light is focused to different depth positions; Diopter Adaptive Mode: The variable focus optical component adjusts the focal length in response to the user's diopter parameters; Ambient light compensation mode: When the reflective surface of the semi-transparent and semi-reflective component is curved or the reflective surface is provided with a diffraction-type functional film layer, the system further includes a compensation lens module, which is configured to counteract the distortion of external ambient light caused by the semi-transparent and semi-reflective component.

[0016] The beneficial effects of this invention are as follows: 1. This invention uses a beam-shaping lens group in the light control module to phase-modulate the original beam emitted by the micro / nano display screen, compressing its divergence angle to below a preset angle, and simultaneously shaping the beam cross-section into a flat beam with compressed width and maintained length, enabling the beam to transmit with extremely low loss within the eyeglass frame with a width of less than 15mm. This solution does not rely on the diffraction propagation principle of optical waveguides, avoiding the extreme light energy loss of only 0.1% to 3% in diffractive waveguide solutions; it also eliminates the need to stack heavy catadioptric optical components directly in front of the eyes, fundamentally solving the problem of the bulky size of traditional high-efficiency solutions. 2. The display components of this invention are arranged as a whole on the edge or corner of the eyeglass frame, and the optical central axes of the micro / nano display screen, light control module, and projection module are all located in the same reference plane, with the flat beam propagating along a slender channel within this reference plane. Unlike solutions like Birdbath, which require placing the semi-transparent, semi-reflective structure directly in front of the pupil, this invention moves the optical components out of the user's central field of vision, eliminating physical obstruction in the center of the field of vision. It also avoids the loss of ambient light transmittance caused by the central reflective element, providing users with a more transparent and natural field of vision and a more comfortable visual experience. This is particularly suitable for augmented reality applications where high visual transparency is required. 3. Addressing the common physiological base curve (curved profile) of AR glasses lenses, this invention features a continuously varying refractive index distribution along the width of the lens's edge gradient region. When the light emitted from the projection module enters this region at a preset incident angle, the light undergoes continuous deflection in the gradient refractive index medium, and its propagation direction is parallel to the tangential plane of the lens surface when entering the central main viewing area. This design overcomes the technical challenge of traditional straight-propagating light beams easily escaping due to total internal reflection or refraction from curved lenses caused by interference with the curved surface boundary. This allows the flat optical path solution of this invention to reliably adapt to real eyeglass lenses with a base curve, expanding the system's practical application range. 4. The eye coupling module of this invention employs a semi-transparent, semi-reflective component (selected from a single semi-transparent, semi-reflective mirror, microelectromechanical system mirror, or micro-reflection array). Its reflective surface can be configured as a plane or curved surface and is equipped with functional films such as metasurface films and holographic surface films. By adjusting the angle of the reflective surface through a fine-tuning mechanism or by separately adjusting multiple micro-reflective surfaces in the micro-reflection array, the system can achieve eye box expansion functionality. By changing the focal length of the beam through an internally integrated variable-focus optical component (such as an electro-optical liquid crystal lens), the system can achieve multi-focal-plane three-dimensional depth-of-field display and adaptive diopter adjustment, allowing myopic, hyperopic, or astigmatic users to obtain clear images without additional corrective lenses. When the reflective surface is curved or equipped with a diffractive functional film, the compensation lens module can counteract the distortion of ambient light, ensuring the authenticity of the see-through image. These multi-mode functions enable the same hardware platform to adapt to different user needs and usage scenarios, greatly improving the system's versatility and user experience.5. This invention overcomes the physical limitations of single-chip micro-nano displays in resolution and luminous area by setting multiple sets of micro-nano displays and their corresponding light control and projection modules at different positions on the frame. Each set of flat light paths projects directly into the eye, and the images entering the eye are superimposed, spliced, or combined on the retina. Especially when a distributed multi-optical-mechanical color-combining architecture is adopted, it maintains the flat shape of the overall light path and effectively solves the limitations of single-chip full-color displays in terms of brightness, color purity, and lifespan, making it suitable for high-end AR devices with high requirements for color performance and brightness.

[0017] In summary, this invention achieves a thin and light integrated side bezel for near-eye display systems while also taking into account multiple advantages such as high optical efficiency, no central obstruction, curved surface adaptation, multi-mode dynamic adjustment, and splicing expansion. It overcomes the technical contradiction in existing technologies where it is difficult to achieve both light efficiency, size, and wearing experience, and has good prospects for industrial application and commercial value. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a thin and light near-eye display system and its flat optical path provided in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the edge-gradient refractive index optical path of an adaptive curved lens provided in a specific embodiment of the present invention; Figure 3 This is an internal diagram and optical path diagram of a thin and light near-eye display system provided in a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the connection mechanism of a thin and light near-eye display system provided in a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the structure and optical path of the display component located on the upper right outer side of the frame, according to a specific embodiment of the present invention. Figure 6 This is a schematic diagram of the structure and optical path of the display component located on the upper right inner side of the frame, according to a specific embodiment of the present invention. Figure 7 This is a schematic diagram of the structure and optical path of the display component located in the upper left corner of the frame according to a specific embodiment of the present invention; Figure 8 This is a schematic diagram of a thin and light near-eye display system provided in a specific embodiment of the present invention, placed on the side of a glasses frame for color matching; In the diagram, 100-eyeball, 101-eyeglass frame, 102-micro-nano display screen, 103-light control module, 104-micro-projection module, 105-reflective element, 106-connector rotation module, 107-connector fixing module, 108-magnetic module, 109-knob, 110-thin near-eye display component, 111-color-combining prism. Detailed Implementation

[0019] This invention discloses a thin and light near-eye display system. Those skilled in the art can refer to the content of this document and appropriately improve the technical details to achieve the desired implementation. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The apparatus and application of this invention have been described through preferred embodiments. Those skilled in the art can obviously make modifications or appropriate alterations and combinations to the apparatus and application described herein without departing from the content, spirit, and scope of this invention to implement and apply the technology of this invention.

[0020] The applicant's research revealed that when the emitted light from the projection module enters the lens from the side of the frame, intending to propagate along the lens plane to the reflective element located in the center of the lens, the AR glasses lenses, designed to conform to the physiological curvature of the human face, typically have a curved profile (i.e., a base curve). As the light propagates in a straight line inside the lens, interference with the curved lens surface is inevitable. With increasing propagation distance, the distance between the straight beam and the curved surface boundary gradually decreases. Before the beam reaches the reflective element, its edge rays may exceed the physical boundary of the lens, resulting in total internal reflection or refraction and escaping, leading to light energy loss. In severe cases, it may even fail to reach the reflective element at all. This problem is particularly pronounced when the lens has a large base curve or the transmission distance from the side frame to the reflective element is long. For lenses with curved profiles, existing technologies have not yet provided a solution for effectively constraining the beam during its transmission from the side frame to the central reflective element and preventing it from escaping the lens before reaching the reflective element.

[0021] Therefore, embodiments of the present invention provide a thin and light near-eye display system, such as Figure 1 As shown, the near-eye display system includes: a frame 101, a lens disposed on the frame 101, and a display component 110 attached to the frame 101; Display component 110 includes micro-nano display 102, light control module 103 and projection module 104; The original beam emitted by the micro / nano display 102 has a first divergence angle; The light control module 103 includes a beam shaping lens group, which is configured to perform phase modulation on the original beam, compress the first divergence angle to a second divergence angle that is less than a preset angle, and simultaneously shape the beam cross-section into a flat beam whose width dimension is compressed and whose length dimension is maintained, and the aspect ratio of the flat beam is greater than a preset ratio. The projection module 104 is disposed on the output light path of the light control module 103 and is configured to receive the flat beam and perform aberration correction and focusing before outputting; The display component 110 is arranged on the edge or corner of the frame 101. The optical central axes of the micro-nano display 102, the light control module 103 and the projection module 104 are all located in the same reference plane. The flat beam of light enters the human eye after propagating along the channel in the reference plane.

[0022] It should be noted that the near-eye display system mainly includes a frame 101, lenses disposed on the frame 101, and a display component 110 attached to the edge or corner of the frame 101. The display component 110 consists of three core parts: a micro-nano display screen 102, a light control module 103, and a projection module 104. Among them, the beam shaping lens group in the light control module 103 is the key component for realizing the "flat optical path" of this invention. It can perform phase modulation on the original beam emitted by the micro-nano display screen 102 (which has a large divergence angle), compressing the divergence angle to below a preset angle (preferably less than 15°), and simultaneously shaping the beam cross-section into a flat shape with the width direction compressed and the length direction maintained. The aspect ratio of the flat beam is greater than a preset ratio (preferably not less than 3:1). This flat beam, after being shaped, has a significantly reduced width and can be effectively transmitted along a narrow channel within the narrow space of the eyeglass side frame, avoiding the problem in traditional solutions where the beam cannot propagate in a narrow channel due to an excessively large divergence angle. The projection module 104 is positioned on the outgoing light path of the light control module 103, receiving the flat beam and performing aberration correction and focusing before emission. The display component 110 is arranged along the edge or corner of the frame 101, and the optical central axes of the micro / nano display screen 102, the light control module 103, and the projection module 104 are all located in the same reference plane. The flat beam propagates along a narrow channel within this reference plane before entering the human eye. Through the above-mentioned "beam shaping + coplanar optical path" design, this invention transforms the traditional three-dimensional optical path into a planar optical path, thereby achieving efficient optical transmission within an extremely narrow side bezel.

[0023] In this specific embodiment, the display component 110 and the frame 101 have an integrated configuration or an external configuration: In the integrated configuration, each module of the display component 110 is integrated into the frame 101; In the external configuration, the display component 110 is detachably attached to the edge or corner of the frame 101 via a connecting mechanism.

[0024] It should be noted that in the integrated configuration, each module of the display component 110 (micro-nano display screen 102, light control module 103, projection module 104) is integrally embedded inside the frame 101, forming a non-removable whole structure. This configuration is suitable for mass-produced products that pursue extreme thinness and structural strength. In the external configuration, the display component 110 is detachably attached to the edge or corner of the frame 101 through a connecting mechanism (such as a magnetic structure, a snap-fit ​​structure, a clamping structure, or an embedding structure). Users can remove the display component 110 from the frame 101 as needed, restoring the glasses to the form of ordinary glasses, or replace it with a display component 110 of different specifications to achieve functional upgrades. This flexible configuration design allows the present invention to adapt to the usage habits of different users and the needs of different product positioning.

[0025] In this specific embodiment, the emitted light from the projection module 104 enters the interior of the lens and propagates from the edge region of the lens to the center region of the lens. After propagating to the reflective element 105 disposed in the center region of the lens, it is reflected by the reflective element 105 and then emitted from the lens into the human eye. The reflective element 105 includes at least one of a total reflection mirror, a semi-transparent semi-reflective mirror, a microelectromechanical system reflector, or a micro-reflective array.

[0026] It should be noted that the emitted light from the projection module 104 first enters the lens from the side area of ​​the frame 101, and then propagates from the edge area to the center area of ​​the lens. After propagating to the reflective element 105 located in the center area of ​​the lens, it is reflected by the reflective element 105 and exits the lens into the human eye. The reflective element 105 can be a total internal reflection mirror (which completely reflects light using the principle of total internal reflection), a semi-transparent and semi-reflective mirror (which allows some ambient light to pass through while reflecting the projected light, achieving virtual-real fusion), a microelectromechanical system (MEMS) reflector (which can dynamically adjust the reflection angle through electronic control), or a micro-reflective array (composed of multiple tiny reflective surfaces, which can achieve wavefront control). This design moves the reflective element 105 from the traditional front position of the lens to the center area inside the lens, which reduces the space occupied by the external environment while ensuring effective deflection of light into the eye, and is conducive to achieving a thinner and lighter overall system.

[0027] Furthermore, the lens includes a central main viewing area and an edge gradient area located between the central main viewing area and the edge of the frame 101; the reflective element 105 is disposed in the central main viewing area; the edge gradient area has a continuously varying refractive index distribution along the width direction from the edge to the center, and the refractive index distribution is set such that when the outgoing light from the projection module 104 enters the edge gradient area at a preset incident angle, the light is continuously deflected in the edge gradient area, and when it enters the central main viewing area, its propagation direction is parallel to the surface tangent plane of the lens at the entry point.

[0028] It should be noted that the lens includes two functional areas: a central main viewing area and an edge gradient area. The central main viewing area is the area through which the user's line of sight passes during normal viewing, and the reflective element 105 is also located in this area. The edge gradient area is located between the central main viewing area and the edge of the lens frame 101, and its core feature is a continuously changing refractive index distribution along the direction from the edge to the center (i.e., the width direction). When the light emitted from the projection module 104 enters this edge gradient area at a preset incident angle, due to the continuous change in refractive index along the width direction, the light will be continuously deflected (i.e., continuously change its propagation direction) during propagation, forming a smooth curved trajectory. When the light enters the central main viewing area from the edge gradient area, its propagation direction is precisely "straightened" to be parallel to the surface tangent plane of the lens at that entry point. The core function of this design is that when the lens has a curved profile to fit the physiological curvature of the human face, light enters the edge gradient area and is guided by the gradient refractive index to bend and propagate along the curved surface, thus avoiding the problem of the light beam running out of the lens due to interference with the curved lens surface in the traditional straight propagation scheme.

[0029] Furthermore, the refractive index distribution in the gradient region satisfies the following relationship: in, The refractive index of the central main viewing area at the boundary of the edge gradient region. The width of the edge gradient area. It represents the distance from the incident boundary of the gradient region along its width direction. And preset incident angle Width of the edge gradient area satisfy: in, The offset of the center ray of the outgoing beam of the projection module 104 at the incident boundary of the edge gradient region along a direction perpendicular to the tangent plane of the lens surface; The path of light propagation within the gradient region is described by the following formula: in, Let be the distance the light travels along the incident direction within the gradient region at the edge. For the distance of light propagation The vertical displacement of the point deviating from its incident direction, when hour, The light rays exit in a direction parallel to the tangent plane of the lens surface at the point of entry.

[0030] It should be noted that the refractive index of the edge gradient zone is not uniformly distributed, but changes according to a specific continuous pattern from the edge of the frame 101 towards the center of the lens—the refractive index is lower near the edge and gradually increases towards the boundary of the central main viewing area, and the rate of change of refractive index is smooth and controllable. When the emitted light from the projection module 104 enters the edge gradient zone at a preset incident angle, due to the continuous change in refractive index, the light will continuously deflect towards the direction with higher refractive index during propagation, forming a smoothly curved propagation trajectory. There is a one-to-one mathematical relationship between this refractive index change pattern and the width of the edge gradient zone, the preset incident angle of the light, and the vertical offset of the light's incident position relative to the central reference plane of the lens: for a given edge gradient zone width and a given incident position offset, there exists a uniquely determined preset incident angle, such that the light can start precisely from the incident position, undergo smooth curvature within the edge gradient zone, and at the boundary entering the central main viewing area, its propagation direction becomes exactly horizontal (i.e., parallel to the tangent plane of the lens surface). The trajectory of light within the edge gradient zone is a sinusoidal curve—it gradually bends from the incident end, the degree of bending first increasing and then decreasing, ending precisely at the boundary of the central main viewing area, where the light resumes straight-line propagation, and this straight line is parallel to the tangent plane of the lens surface. This quantitative relationship constitutes the optical design principle of the edge gradient zone, enabling engineers to accurately calculate the required refractive index distribution curve based on the actual size of the lens and the layout parameters of the display component 110, thereby achieving the technical effect of "safe transmission of the light beam within the curved lens without escaping." It should be noted that in actual products, due to factors such as material manufacturing tolerances, environmental temperature variations, and the wavelength bandwidth of the light source, there may be slight deviations between the actual refractive index distribution and the aforementioned ideal mathematical relationship. However, this invention covers equivalent implementations within such deviation ranges—as long as the basic working principle of the edge gradient zone (i.e., guiding the light beam to smoothly deflect through a continuously changing refractive index, so that the light beam becomes parallel to the lens surface direction when entering the central main viewing area) remains unchanged, the specific refractive index values ​​and distribution curves can be adaptively adjusted according to actual engineering conditions.

[0031] Specifically, such as Figure 2 As shown, Figure 2 The principle of this embodiment is demonstrated, overcoming the technical problem that traditional straight-propagating light beams are prone to total internal reflection or refraction in curved lenses due to interference with the curved surface boundary. This enables the flat optical path scheme of the present invention to reliably adapt to real eyeglass lenses with a base curve, expanding the practical scope of the system. Figure 2 In this context, the symbols have the same meaning as in the formulas above.

[0032] In this specific embodiment, the micro-nano display screen 102 includes one or more micro-nano display screens 102 and corresponding driving circuits and driving power supplies; The micro-nano display 102 is disposed on the upper and / or lower side of the lens frame 101, so that the emitted light path of the micro-nano display 102 propagates along the extension direction of the lens frame 101.

[0033] It should be noted that the micro-nano display 102 includes one or more micro-nano display chips 102 (such as Micro-LED chips, Micro-OLED chips, etc.), as well as corresponding driving circuits (for controlling the light emission state of each pixel) and driving power supplies (for powering the chips and circuits). The micro-nano display 102 is disposed on the upper and / or lower side of the frame 101—that is, a single chip can be placed on the upper or lower side of the frame 101, or multiple chips can be placed on the upper and lower sides respectively. This arrangement allows the light emitted from the micro-nano display 102 to propagate along the extension direction of the side of the frame 101, which is consistent with the light path direction of "flat beam propagating along a narrow channel in the reference plane" in claim 1. Arranging the micro-nano display 102 on the side of the frame 101 rather than directly in front of the lens is one of the core layout ideas of this invention, effectively utilizing the side frame space that is not fully utilized in traditional eyeglasses products.

[0034] Furthermore, the micro-nano display 102 is selected from at least one of the following display technologies: Micro-LED, Micro-OLED, Mini-LED, Mini-OLED, LCD, DLP, LCOS, LED, and laser projection; When the system is configured for monochrome display, the micro-nano display 102 includes a single monochrome micro-nano display 102; When the system is configured for color display, the micro-nano display 102 is selected from one of the following two configurations: It consists of three monochrome micro-nano displays 102 of red, green and blue, with the light emitted from each sub-screen being independently collimated and then combined into full-color light by a color combining element; or it consists of a single full-color micro-nano display 102.

[0035] It should be noted that the micro-nano display 102 can be selected from active-emitting micro-display technologies such as Micro-LED, Micro-OLED, Mini-LED, and Mini-OLED, or passive-emitting or projection display technologies such as LCD, DLP, LCOS, LED, and laser projection. All of these technologies are capable of achieving miniaturized image display in this field, and can be selected based on the specific application scenario's requirements for brightness, resolution, power consumption, and cost. Regarding display modes, when the system only needs to display monochrome images, the micro-nano display 102 only needs to contain a single monochrome micro-nano display 102. When the system needs to display color images, one of two configurations can be adopted: First, three monochrome micro-nano displays 102 (red, green, and blue) emit three primary colors of light respectively. The emitted light from each sub-screen is independently collimated and then combined into a single full-color beam by a color combining element (such as a color combining prism 111 or a cross-reflector). This scheme can achieve higher brightness and color purity. Second, a single full-color micro-nano display 102 directly generates a full-color image. This scheme has a simpler and more compact structure. The above-mentioned various technical options and configurations enable the present invention to flexibly adapt to product designs with different performance requirements and cost budgets.

[0036] Furthermore, multiple micro-nano displays 102 are respectively set at different positions of the frame 101, and the corresponding flat optical paths of each group are directly projected into the eye, and the images entering the eye are superimposed, spliced ​​or combined on the retina. The outgoing light rays from the flat optical path are incident at an angle relative to the visual axis of the human eye, with an angle of 20° to 45°.

[0037] It should be noted that when a larger display area, higher resolution, or richer display effects are required on the glasses, multiple sets of micro-nano displays 102 can be set at different positions on the frame 101. Each set of micro-nano displays 102 corresponds to a set of light control modules 103 and projection modules 104, forming multiple independent flat light paths. These light paths can be projected directly into the eye from different directions (without passing through the reflective element 105). The images entering the eye are superimposed on the retina (multiple paths display the same content to enhance brightness), spliced ​​(each path displays different parts of the image and combines them into a complete large image), or color-combined (each path displays different color components and combines them into a full-color image) to form the final visible image. When using the direct-in-eye method, the outgoing light rays are incident at an angle relative to the visual axis of the human eye (i.e., the normal viewing direction of the human eye), and the angle of incidence is controlled within the range of 20° to 45°. If the angle of incidence is too small, the display component 110 will obstruct the field of vision, and if the angle of incidence is too large, it will increase the difficulty of optical design and the complexity of aberration control. This angle range is an optimal value determined while taking into account both field of view transparency and optical imaging quality.

[0038] Furthermore, the micro-nano display 102 includes three monochrome micro-nano display 102s: red, green, and blue. The light emitted from each sub-screen is independently collimated and then incident on a cross-reflector to be combined into full-color light. The surface or interior of the cross-reflector is provided with a dichroic film layer, which is configured to selectively reflect light of different wavelengths or polarization states.

[0039] It should be noted that when the micro-nano display screen 102 uses three monochrome micro-nano display screens 102 (red, green, and blue), the emitted light from each sub-screen passes through an independent collimating optical system (converting divergent light into parallel light) and then simultaneously enters the cross-reflector. The surface or interior of the cross-reflector is provided with a color-separating film layer—a thin film prepared using the principle of optical interference, which has different reflectivities or transmittances for different wavelengths of light. Specifically, this color-separating film layer is configured such that the red light band is efficiently reflected in a specific direction, the green light band is efficiently reflected in another specific direction (or transmitted), and the blue light band is similarly reflected. Through the beam combining of each color light at different reflective surfaces, the three colors of light ultimately propagate along the same optical path and merge into a single full-color beam. In addition to wavelength selectivity, this color-separating film layer can also be configured to selectively reflect light with different polarization states to meet the needs of polarized light sources or polarization-sensitive display chips. Through the above color combining scheme, this invention achieves color display while maintaining a flat optical path shape, avoiding the problems of insufficient brightness and color purity that may exist with a single full-color chip.

[0040] In this specific embodiment, the system also includes an eye-in-coupling module, which is a semi-transparent and semi-reflective component. The semi-transparent and semi-reflective component is selected from at least one of the following: a single semi-transparent and semi-reflective mirror, a microelectromechanical system reflector, and a micro-reflective array. The reflective surface of the semi-transparent and semi-reflective component is selected from a plane or a curved surface, and the surface of the reflective surface is provided with at least one functional film layer selected from the following: metasurface film, holographic surface film, volume holographic surface film, and semi-transparent and semi-reflective film; The system is configured to use at least one of the following functional modes: Eye box expansion mode: The system adjusts the overall tilt angle of the reflective surface of the semi-transparent and semi-reflective component through a fine-tuning mechanism, or adjusts the relative tilt angle and position of multiple micro-reflective surfaces in the micro-reflective array separately to deflect the light beam to different pupil positions. Multi-focal plane 3D display mode: The system changes the focal length of the beam through an internally integrated variable focal length optical component, so that the light is focused to different depth positions; Adaptive diopter mode: The variable focus optics adjust the focal length in response to the user's diopter parameters; Ambient light compensation mode: When the reflective surface of the semi-transparent and semi-reflective component is curved or the reflective surface is provided with a diffraction-type functional film layer, the system also includes a compensation lens module, which is configured to counteract the distortion of external ambient light caused by the semi-transparent and semi-reflective component.

[0041] It should be noted that: The eye-box expansion mode adjusts the overall tilt angle of the reflective surface of the semi-transparent / semi-reflective component through a fine-tuning mechanism (such as a piezoelectric ceramic actuator or a micro stepper motor), or separately adjusts the relative tilt angle and spatial position of multiple micro-reflective surfaces in the micro-reflection array, allowing the deflected beam to cover different pupil positions. When the user's eyeball rotates 100 degrees, the system dynamically adjusts the reflection parameters to ensure the beam always tracks the pupil position, thus obtaining a stable image without requiring the user to consciously maintain their head posture. This significantly expands the eye-box's coverage area and improves the tolerance for errors in the wearing experience.

[0042] Multi-focal-plane 3D depth-of-field display mode – The system integrates a variable-focus optical component (such as an electro-controlled liquid crystal lens, whose focal length can be continuously adjusted by changing the voltage applied to the transparent electrode). By changing the focal length of this component, image light is focused at different depth positions. When the image is presented sequentially at different depths, the human eye's lens adjusts its focal length accordingly to see the image at each depth clearly, thereby producing a 3D visual experience with realistic depth levels and effectively alleviating visual fatigue caused by convergence-accommodation conflict in traditional near-eye displays.

[0043] Adaptive diopter mode—The aforementioned variable-focus optical components adjust the focus in response to the user's specific refractive parameters (i.e., the degree and axis of myopia, hyperopia, or astigmatism), ensuring that image light is precisely focused on the user's retina. This feature allows users with different refractive states to obtain a clear virtual image without wearing additional corrective glasses, achieving personalized visual adaptation at the hardware level. This adjustment can be manually set based on the user's refraction data or automatically configured in conjunction with automatic refractive measurements.

[0044] Ambient Light Compensation Mode – When the reflective surface of the transflective component is curved, the curved reflection will produce additional optical power on the ambient light passing through the component, causing distortion of the real-world image seen by the user. When a diffraction-type functional film layer (such as a holographic surface film or a volume holographic surface film) is applied to the reflective surface, this film layer will also have a diffraction or refraction effect on the ambient light, similarly causing distortion of the perspective image. Therefore, the system sets up a compensation lens module on the outside. The optical power of this module is equal in magnitude but opposite in sign to the optical power produced by the transflective component on the ambient light; the two cancel each other out, thus ensuring that the ambient light observed by the user through the system maintains its original shape and clarity, guaranteeing the realism and naturalness of the augmented reality experience. The compensation lens module can be implemented using Fresnel lenses (thin and lightweight) or cemented doublet lenses (good chromatic aberration correction), and its specific configuration depends on the curvature parameters or diffraction characteristics of the transflective component.

[0045] Specific Implementation Example 1, such as Figure 1 As shown, Figure 1 (a) Front view of the system optical path; (b) Top view of the system optical path; (c) Schematic diagram of the system's three-dimensional structure. The entire thin and light near-eye display assembly 110 is connected to the inside of the eyeglass side frame via a connecting mechanism (preferably magnetic in the first specific application). This assembly integrates three core modules: a micro-nano display 102, a light control module 103, and a projection module 104. The micro-nano display 102 is a high-brightness micro-nano display (such as Micro-OLED), with its driving circuit and micro-power supply integrated into the chip backplane or adjacent temple of the eyeglasses, and electrically connected to the chip via a flexible circuit. The light control module 103 is positioned close to the micro-nano display 102, and its core function is to shape the divergent light emitted by the micro-nano display 102 into a highly collimated, width-compressed flat beam. To achieve this function, the light control module 103 employs a miniaturized beam-shaping lens group. This lens group can be composed of one or more combinations of aspherical lenses, metasurface optical elements, or Fresnel lenses, controlling the divergence angle of the emitted beam to within 15°, while significantly compressing the width of the beam cross-section and maintaining its length, with an aspect ratio of not less than 3:1. A projection module 104 is located behind the light control module 103, responsible for receiving the shaped flat beam and performing final aberration correction and focus adjustment to ensure the emitted light achieves high-quality imaging. A reflective element 105 is disposed internally near the center region of the lens. This reflective element 105 is selected from at least one of a total reflection mirror, a semi-transparent mirror, a microelectromechanical system (MEMS) mirror, or a micro-reflection array.

[0046] The complete workflow of Specific Embodiment 1 is as follows: The micro-nano display screen 102 generates an image and emits light. The light is first compressed and collimated into a flat beam by the light control module 103. Then, the flat beam enters the projection lens of the projection module 104 for aberration correction and fine-tuning. The fine-tuned flat beam propagates horizontally along the elongated channel on the side of the lens frame 101 to the reflective element 105 in the central region of the lens. The reflective element 105 then deflects the beam at a specific angle (e.g., 45°), causing it to exit from the lens and enter the pupil of the human eye, ultimately forming a clear image on the retina. In the entire optical path, the optical central axes of the micro-nano display screen 102, the light control module 103, and the projection module 104 are all located in the same reference plane. The flat beam propagates along the elongated channel in this reference plane, thereby achieving the flattening of the optical path.

[0047] In specific embodiment two, such as Figure 3 As shown, Figure 3(a) A thin and light near-eye display system micro-display module and its internal structure; (b) Optical path diagram of the micro-display module; (c) Optical path diagram of the thin and light near-eye display system deflected into the eye through a semi-transparent and semi-reflective structure; (d) Optical path diagram of a typical microlens array directly projected into the eye. All core optical components—including the micro / nano display 102, the light control module 103, and the projection module 104—are encapsulated in a flat, streamlined housing, forming a complete and independent optical engine. The core design of this optical engine lies in the high integration of the light control module 103 and the projection module 104, employing a hybrid optical design such as the fusion of metasurfaces and refractive lenses, thereby condensing the beam shaping, collimation, and projection functions within a sealed component. When the micro / nano display 102 emits image light, the light undergoes all optical processing from initial shaping to final emission within this integrated engine, and the emitted light from the engine is directly projected into the human eye without relying on any external reflective element 105. This direct projection method not only simplifies the entire optomechanical structure, but also significantly reduces the difficulty of optical path alignment caused by the relative positional deviation of multiple components during assembly.

[0048] When the system is positioned at the corner of the frame 101 or in another location where it cannot be directly facing the human eye, a reflective element 105 positioned appropriately on the frame 101 can be used to deflect the system's light path once or multiple times before it enters the human eye, thus achieving a clear image display. This reflective element 105 can be a micromirror or a MEMS mirror array, and its reflection angle can be precisely calibrated during assembly or dynamically adjusted electronically during use.

[0049] The projection module 104 may employ a multi-element micro-projection lens group composed of one or more combinations of refractive lenses, aspherical lenses, Fresnel lenses, freeform lenses and diffractive optical elements. The modulation transfer function value of this lens group at the system cutoff frequency is maintained above 0.1, and the maximum optical distortion rate is controlled within 10% to ensure that the imaging quality meets the visual requirements of the human eye.

[0050] In specific embodiment three, the key mechanical connection mechanism for achieving the adjustable angle of the thin and light near-eye display component 110 is described in detail. For example Figure 4 As shown, Figure 4(a) Thin and light near-eye display system and connecting mechanism; (b) Connecting module in thin and light near-eye display system; (c) Thin and light near-eye display system and connecting mechanism rotated 90°; (d) Bottom view of the connecting mechanism. This connecting mechanism acts as a bridge between the optical components and the eyeglass frame 101, directly affecting imaging stability and wearing comfort. Its structure can be divided into three layers. The basic connecting component fixing module 107 is fixed to a predetermined position on the eyeglass frame 101 by means of snaps, threaded connections, or adhesives. This module and the eyeglass frame 101 have a fixed connection that can be either non-removable or detachable, depending on the product design requirements. Located in the middle layer is the connecting component rotation module 106, which is connected to the connecting component fixing module 107 via a miniature rotating shaft. The user can drive the internal worm gear or gear transmission mechanism by rotating the exposed fine-tuning knob 109, allowing the entire rotatable base to perform precise pitch rotation within a range of ±90°. The top layer is the magnetic module 108, which has a permanent magnet array embedded in the top of the rotatable base. It is connected to the magnetic or ferromagnetic elements on the bottom of the display component 110 housing by magnetic attraction, so as to achieve a firm connection and convenient assembly and disassembly.

[0051] In the fourth specific embodiment, a layout scheme is shown in which the thin and light near-eye display component 110 is located on the upper right side of the frame 101, away from the human eye.

[0052] like Figure 5 As shown, Figure 5 In the diagram, (a) shows the thin and light-sensitive near-eye display system positioned outside the glasses and its direct optical path into the eye; (b) is a top view of the system's optical path; (c) is a side view of the system's optical path; and (d) is a layout diagram of the thin and light-sensitive near-eye display system. The display component 110 is positioned on the outer side of the upper right corner of the frame 101, its shape resembling the temple extension of traditional sports glasses or sunglasses. In this layout, the optical central axes of each module within the display component 110 are coplanar. A flat beam of light exits obliquely downwards from the upper right, forming a flat, slender optical path along the plane of the frame 101 before entering the eye. Because the component is located above the frame 101 rather than directly in front of the lenses, the user's forward field of vision is completely unobstructed, achieving a transparent augmented reality viewing experience.

[0053] Compared to the arrangement on the side of the frame, the upper right corner layout provides more flexibility for optical design—the corner area has some extension space in both the horizontal and vertical directions, thus accommodating more complex or higher-performance lens groups, which helps to achieve a larger field of view or higher resolution. In this embodiment, the rotational fine-tuning function of the connecting mechanism is given a deeper meaning: the user can not only adjust the physical pointing angle of the beam by rotating the knob 109, but also link the optical elements inside the component to dynamically adjust the projection focal length. This design allows nearsighted or farsighted users to achieve clear focus of the virtual image on the retina simply by rotating the physical knob 109 without wearing additional corrective glasses, realizing hardware-level adaptive diopter adjustment.

[0054] In specific embodiment five, a layout scheme is shown in which the thin and light near-eye display component 110 is located on the upper right side of the frame 101, close to the human eye.

[0055] like Figure 6 As shown, Figure 6 (a) The thin and light near-eye display system is placed inside the glasses and the direct light path into the eye. (b) Top view of the system's light path. (c) Side view of the system's light path. (d) Layout diagram of the thin and light near-eye display system. The display component 110 is arranged inside the upper right corner of the frame 101. Its optical function is basically the same as in Embodiment 4, the difference being the spatial orientation of the component: in Embodiment 4, the component protrudes outward, while in this embodiment, the component is arranged inward. The advantage of the inward arrangement is that the optical component is closer to the eye, and the propagation distance of the flat beam from the component to the pupil is shorter, which helps to reduce the divergence loss of the beam in the air gap. At the same time, the positioning accuracy requirement for the eye box is relatively low. This scheme is particularly suitable for product designs with high requirements for compact size—after the display component 110 is embedded inside the frame 101, the outer surface of the glasses remains flat from the appearance, and the visual effect is more concise. The connection mechanism also adopts a combination of magnetic attraction and rotation, and the user can fine-tune the position of the component according to wearing comfort and visual clarity.

[0056] In Specific Implementation Six, another innovative implementation method of "flat and bent optical path" is provided.

[0057] like Figure 7 As shown, Figure 7 In the diagram, (a) is a front view of the system, (b) is a right view of the system's optical path, and (c) is a side view of the system's optical path. The key difference between this scheme and Embodiment 1 lies in the position of the reflective element 105. In Embodiment 1, the reflective element 105 is located in the central area of ​​the lens, and the flat beam of light is directly deflected into the eye after being horizontally directed from the side frame to the central reflective element 105. In this embodiment, the display component 110 is still located in the upper right corner of the lens frame 101, but the flat beam of light emitted from it is not directly directed to the center of the lens. Instead, it propagates along the upper frame of the lens frame 101 to a reflective element 105 independently arranged in the upper left corner of the lens frame 101. After the flat beam of light is horizontally emitted from the side component, it propagates along the upper edge of the lens frame 101 to the position of the front reflective element 105, where it is captured and deflected into the eye.

[0058] The advantage of this design lies in shifting the reflection point of the light path from directly in front of the user's eye to a corner of the frame 101, making the installation position of the display component 110 more flexible and concealed—the display component 110 can even be completely hidden inside the frame of thick-rimmed glasses, making it almost imperceptible from the outside. Simultaneously, because the reflective element 105 is moved to the corner, there are no optical elements obstructing the central area of ​​the lens, ensuring complete transparency of the user's forward field of vision, with ambient light transmittance approaching 100%, achieving the most ideal augmented reality perspective effect. Furthermore, this layout provides a longer light path transmission distance at the upper edge of the frame 101, allowing the light beam more space for collimation and shaping before reaching the reflective element 105, which is beneficial for achieving better optical performance control and less imaging distortion.

[0059] In specific embodiment seven, a system-level solution for distributed multi-optical-mechanical color combining is proposed to meet the requirements of high color gamut and high brightness full-color display.

[0060] like Figure 8 As shown, Figure 8 In the diagram, (a) is a schematic diagram of the color-combining optical path of the system placed on the side of the eyeglass frame 101; (b) is a schematic diagram of the color-combining prism 111; (c) is a top view of the system's optical path; and (d) is a side view of the system's optical path. This system architecture deploys multiple independent, thin near-eye display components 110 in parallel on the right side frame of the eyeglass frame 101. Each component is a complete monochromatic optical engine module, used to drive a micro / nano display screen 102 of one of the three primary colors: red, green, or blue. Specifically, the red display component 110 includes a red micro / nano display screen 102 and its corresponding light control module 103 and projection module 104; the green display component 110 includes a green micro / nano display screen 102 and its corresponding light control module 103 and projection module 104; and the blue display component 110 is similarly designed. The three components operate independently, emitting precisely collimated and shaped red, green, and blue monochromatic flat beams, respectively.

[0061] Three monochromatic flat beams of light propagate along the sides of the lens frame 101 and are guided to the color-combining prism 111 assembly located near the center of the lens frame 101. The color-combining prism 111 contains a dichroic film layer—this film layer has selective reflection or transmission characteristics for different wavelengths of light: red light is reflected in the outgoing direction, green light is reflected in the same outgoing direction along different paths, and blue light is similarly reflected. After multiple reflections and transmissions within the color-combining prism 111, the three colors of light are finally combined into a single full-color beam along the same optical path. The combined full-color beam exits from the exit surface of the color-combining prism 111, passes through the reflective element 105 located in the central region of the lens, and is projected into the eye, forming a color image on the retina.

[0062] This "distributed light emission, central color combining" architecture effectively solves the limitations of single-chip full-color display solutions in terms of brightness, color purity, and lifespan while maintaining a flat overall optical path. The advantages of using independent red, green, and blue chips are: each color chip can independently optimize its light-emitting material and driving parameters, unaffected by the manufacturing process limitations of other color pixels; the three colors are independently collimated before color combining, eliminating the color shift problem caused by differences in the emission angles of different color pixels in single-chip full-color solutions. This solution is particularly suitable for high-end augmented reality devices that use high-power monochromatic Micro-LEDs as the light source.

[0063] The core value of this connection mechanism lies in allowing users to manually fine-tune the projection tilt angle of the display component 110 according to their pupil height and wearing habits, ensuring that the imaging beam accurately passes through the center of the pupil. Furthermore, this rotation adjustment can be automated by combining eye-tracking data from the eyeball 100—when the user first wears the glasses, the system detects the pupil position using the eyeball 100 tracking camera, and a micro-motor automatically drives the rotation module to adjust to the optimal angle and lock it, thus achieving a personalized and precise fit for each user. The magnetic connection also supports quick plugging and unplugging and replacement of the display component 110; the same eyeglass frame 101 can accommodate optical engines of different specifications, improving the product's scalability and lifespan.

[0064] This invention utilizes a beam-shaping lens group in the light control module 103 to phase-modulate the original light beam emitted from the micro / nano display screen 102, compressing its divergence angle to below a preset angle. Simultaneously, the beam cross-section is shaped into a flat beam with compressed width and maintained length, enabling the beam to transmit with extremely low loss within the eyeglass side frame, which is less than 15mm wide. This solution does not rely on the diffraction propagation principle of optical waveguides, avoiding the extreme light energy loss of only 0.1% to 3% in diffractive waveguide solutions. Furthermore, it eliminates the need to stack heavy catadioptric optical components directly in front of the eyes, fundamentally solving the problem of the bulky size of traditional high-efficiency solutions.

[0065] In this embodiment of the invention, the display component 110 is arranged entirely on the edge or corner of the frame 101. The optical central axes of the micro-nano display 102, the light control module 103, and the projection module 104 are all located in the same reference plane, and the flat beam propagates along a slender channel within this reference plane. Unlike solutions such as Birdbath, which require placing the semi-transparent and semi-reflective structure directly in front of the pupil, this embodiment of the invention moves the optical component out of the user's central field of vision, eliminating physical obstruction in the center of the field of vision. It also avoids the loss of ambient light transmittance caused by the central reflective element 105, allowing the user to obtain a more transparent and natural field of vision and a more comfortable visual experience when wearing the device. This is particularly suitable for augmented reality applications where high visual transparency is required.

[0066] Considering the fact that AR glasses lenses typically have a physiological base curve (curved profile), this embodiment of the invention sets a continuously varying refractive index distribution along the width direction in the gradient region of the lens edge. When the light emitted from the projection module 104 enters this region at a preset incident angle, the light is continuously deflected in the gradient refractive index medium, and its propagation direction is parallel to the tangential plane of the lens surface when it enters the central main viewing area. This design overcomes the technical problem that traditional straight-propagating light beams are prone to total internal reflection or refraction in curved lenses due to interference with the curved surface boundary, enabling the flat optical path scheme of this embodiment of the invention to reliably adapt to real eyeglass lenses with a base curve, thus expanding the practical scope of the system.

[0067] The eye coupling module in this embodiment of the invention employs a semi-transparent, semi-reflective component (selected from a single semi-transparent, semi-reflective mirror, microelectromechanical system mirror, or micro-reflection array). Its reflective surface can be configured as a plane or curved surface and is equipped with functional films such as metasurface films and holographic surface films. By adjusting the angle of the reflective surface through a fine-tuning mechanism or by separately adjusting multiple micro-reflective surfaces in the micro-reflection array, the system can achieve eye box expansion functionality. By changing the focal length of the beam through an internally integrated variable-focus optical component (such as an electro-optical liquid crystal lens), the system can achieve multi-focal-plane three-dimensional depth-of-field display and adaptive diopter adjustment, allowing users with myopia, hyperopia, or astigmatism to obtain clear images without additional corrective lenses. When the reflective surface is curved or equipped with a diffractive functional film, the compensation lens module can counteract the distortion of ambient light, ensuring the realism of the see-through image. These multi-mode functions enable the same hardware platform to adapt to different user needs and usage scenarios, greatly improving the system's versatility and user experience.

[0068] This invention, through the arrangement of multiple micro-nano displays 102 and their corresponding light control modules 103 and projection modules 104 at different positions on the frame 101, allows each set of flat optical paths to directly project into the eye. The images entering the eye are superimposed, spliced, or combined on the retina, overcoming the physical limitations of a single micro-nano display 102 in terms of resolution and luminous area. Especially when employing a distributed multi-optical-mechanism color-combining architecture, it maintains the flattened shape of the overall optical path while effectively solving the limitations of single-chip full-color displays in terms of brightness, color purity, and lifespan, making it suitable for high-end AR devices with high requirements for color performance and brightness.

[0069] In summary, the embodiments of the present invention achieve a thin and light integrated side bezel of the near-eye display system while taking into account multiple advantages such as high optical efficiency, no central obstruction, curved surface adaptation, multi-mode dynamic adjustment, and splicing expansion. It overcomes the technical contradiction of the prior art that it is difficult to achieve both light efficiency, size and wearing experience, and has good industrial application prospects and commercial value.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0071] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A thin and light near-eye display system, characterized in that, The near-eye display system includes: a frame, a lens disposed on the frame, and a display component attached to the frame; The display components include a micro-nano display screen, a light control module, and a projection module; The original beam emitted by the micro / nano display screen has a first divergence angle; The light control module includes a beam shaping lens group, which is configured to perform phase modulation on the original beam, compress the first divergence angle to a second divergence angle that is less than a preset angle, and simultaneously shape the beam cross-section into a flat beam whose width dimension is compressed and whose length dimension is maintained, wherein the aspect ratio of the flat beam is greater than a preset ratio. The projection module is disposed on the output light path of the light control module and is configured to receive the flat beam and perform aberration correction and focusing before outputting it; The display components are arranged on the edge or corner of the frame. The optical central axes of the micro-nano display, the light control module and the projection module are all located in the same reference plane. The flat beam propagates along the channel in the reference plane and enters the human eye.

2. The thin and light near-eye display system according to claim 1, characterized in that, The display component and the frame can be integrated or externally connected. In the integrated configuration, each module of the display component is integrally embedded inside the frame; In the external configuration, the display component is detachably attached to the edge or corner of the frame via a connecting mechanism.

3. The thin and light near-eye display system according to claim 1, characterized in that, The emitted light from the projection module enters the interior of the lens and propagates from the edge region of the lens to the center region of the lens. After propagating to the reflective element located in the center region of the lens, the light is reflected by the reflective element and exits the lens into the human eye. The reflective element includes at least one of a total reflection mirror, a semi-transparent mirror, a microelectromechanical system (MEMS) reflector, or a micro-reflection array.

4. The thin and light near-eye display system according to claim 3, characterized in that, The lens includes a central main viewing area and an edge gradient area located between the central main viewing area and the edge of the lens frame; the reflective element is disposed in the central main viewing area; the edge gradient area has a continuously varying refractive index distribution along the width direction from the edge to the center, and the refractive index distribution is configured such that when the outgoing light from the projection module enters the edge gradient area at a preset incident angle, the light is continuously deflected within the edge gradient area, and when it enters the central main viewing area, its propagation direction is parallel to the surface tangent plane of the lens at the entry point.

5. The thin and light near-eye display system according to claim 1, characterized in that, The micro-nano display screen includes one or more micro-nano display screens and corresponding driving circuits and driving power supplies; The micro-nano display screen is disposed on the upper and / or lower side of the lens frame, so that the emitted light path of the micro-nano display screen propagates along the extension direction of the lens frame side.

6. The thin and light near-eye display system according to claim 5, characterized in that, The micro-nano display screen is selected from at least one of the following display technologies: Micro-LED, Micro-OLED, Mini-LED, Mini-OLED, LCD, DLP, LCOS, LED, and laser projection; When the system is configured for monochrome display, the micro-nano display screen includes a single monochrome micro-nano display screen; When the system is configured for color display, the micro / nano display screen is selected from one of the following two configurations: It consists of three monochrome micro-nano displays of red, green and blue, with the light emitted from each sub-screen being independently collimated and then combined into full-color light by a color combining element; or it consists of a single full-color micro-nano display.

7. The thin and light near-eye display system according to claim 5, characterized in that, Multiple sets of the micro-nano displays are respectively set at different positions of the frame, and the corresponding flat optical paths of each set are directly projected into the eye. The images entering the eye are superimposed, spliced ​​or combined on the retina. The outgoing light rays of the flat optical path are incident at an angle relative to the visual axis of the human eye, with an angle of 20° to 45°.

8. The thin and light near-eye display system according to claim 5, characterized in that, The micro-nano display screen includes three monochrome micro-nano display screens: red, green, and blue. The light emitted from each sub-screen is independently collimated and then incident on a cross-reflector to be combined into full-color light. The surface or interior of the cross-reflector is provided with a dichroic film layer, which is configured to selectively reflect light of different wavelengths or polarization states.

9. The thin and light near-eye display system according to claim 4, characterized in that, The refractive index distribution of the edge gradient region satisfies the following relationship: in, The refractive index of the central main viewing area at the boundary of the edge gradient region is [value missing]. The width of the edge gradient area. The distance from the incident boundary of the edge gradient region along its width direction. And the preset incident angle Width of the edge gradient area satisfy: in, The offset of the center ray of the emitted beam from the projection module at the incident boundary of the edge gradient region along a direction perpendicular to the tangent plane of the lens surface; The propagation trajectory of light within the gradient region at the edge is described by the following formula: in, Let be the distance the light travels along the incident direction within the gradient region at the edge. For the distance of light propagation The vertical displacement at the point deviating from its incident direction, when hour, The light rays exit in a direction parallel to the tangent plane of the lens surface at the point of entry.

10. The thin and light near-eye display system according to claim 1, characterized in that, The system also includes an eye-in-coupling module, which is a semi-transparent and semi-reflective component, and the semi-transparent and semi-reflective component is selected from at least one of the following: a single semi-transparent and semi-reflective mirror, a microelectromechanical system mirror, and a micro-reflective array. The reflective surface of the semi-transparent and semi-reflective component is selected from a plane or a curved surface, and the surface of the reflective surface is provided with at least one functional film layer selected from the following: metasurface film, holographic surface film, volume holographic surface film, and semi-transparent and semi-reflective film. The system is configured in at least one of the following functional modes: Eye box expansion mode: The system adjusts the overall tilt angle of the reflective surface of the semi-transparent and semi-reflective component through a fine-tuning mechanism, or adjusts the relative tilt angle and position of multiple micro-reflective surfaces in the micro-reflective array separately to deflect the light beam to different pupil positions. Multi-focal plane three-dimensional display mode: The system changes the focal length of the light beam through an internally integrated variable focal length optical component, so that the light is focused to different depth positions; Diopter Adaptive Mode: The variable focus optical component adjusts the focal length in response to the user's diopter parameters; Ambient light compensation mode: When the reflective surface of the semi-transparent and semi-reflective component is curved or the reflective surface is provided with a diffraction-type functional film layer, the system further includes a compensation lens module, which is configured to counteract the distortion of the external ambient light caused by the semi-transparent and semi-reflective component.

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