AR Optical Engine Module, AR Glasses, AR Display System and AR Display Method

Abstract

Embodiments of the present application provide an AR optical engine module, an AR glasses, an AR display system and an AR display method; the AR optical engine module includes a light source, an illumination waveguide, an imaging lens, an LCOS panel, a diaphragm and a polarization control component; the light source provides illumination light; the illumination waveguide has an entrance pupil area and an exit pupil area, and the illumination light is coupled into the entrance pupil area and coupled out from the exit pupil area; the imaging lens is used for geometrically magnifying the illumination light coupled out from the exit pupil area; the LCOS panel is used for phase modulating the magnified illumination light and forming imaging light, and the imaging light is projected to the exit pupil area through the imaging lens and then exits; the diaphragm is arranged on the path of the imaging light exiting from the exit pupil area and is used for adjusting the exit pupil size; the polarization control component includes a polarization beam splitting film, and the polarization beam splitting film is located between the exit pupil area and the diaphragm and is used for reflecting S-line polarized light and transmitting P-line polarized light.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical display technologies, and more specifically, to an AR optical engine module, an AR glasses, an AR display system, and an AR display method. Background Art

[0002] With the rise of the metaverse concept, as a hardware carrier connecting the real world and the virtual world, the development of AR glasses has attracted much attention in the AR optical display industry. The AR optical engine is the core optical device in AR glasses, and the improvement of its performance is crucial for promoting the development of AR technology.

[0003] Currently, there are mainly two technologies for AR optical engines - μLED optical engines and LCOS optical engines. Among them, the LCOS technology has occupied a dominant position in the development of AR optical engines due to its significant advantages of high resolution, high technology maturity, and strong mass production ability. However, with the improvement of the resolution of LCOS chips and the continuous reduction of pixel sizes, the design requirements for optical engines have also been continuously improved. The existing technologies face severe challenges in this field and are difficult to meet the stringent requirements of high-resolution LCOS chips for optical engines in terms of volume size, optical performance (including imaging clarity, large field of view FOV), etc. Therefore, new technological breakthroughs are urgently needed to solve this problem and promote the further development of AR optical engine technology. Summary of the Invention

[0004] The purpose of the present application is to provide a new technical solution for an AR optical engine module, an AR glasses, an AR display system, and an AR display method.

[0005] In a first aspect, the embodiments of the present application provide an AR optical engine module. The AR optical engine module includes:

[0006] A light source for providing illumination light;

[0007] An illumination waveguide having an entrance pupil area and an exit pupil area, the illumination light being coupled into the entrance pupil area and coupled out from the exit pupil area;

[0008] An imaging lens for geometrically magnifying the illumination light coupled out from the exit pupil area;

[0009] An LCOS panel for phase-modulating the illumination light magnified by the imaging lens and forming imaging light, and the imaging light is then projected to the exit pupil area through the imaging lens and exits;

[0010] A diaphragm disposed on the path of the imaging light exiting from the exit pupil area for adjusting the exit pupil size;

[0011] The polarization control component includes a polarization beam splitting film, which is located between the exit pupil area and the aperture stop and is used to reflect S-line polarized light and transmit P-line polarized light.

[0012] Optionally, the image height of the LCOS panel is D, the total optical length of the AR optical engine module is L, and the ratio D / L between the two satisfies: 0.6 < D / L < 0.8.

[0013] Optionally, the polarization control component further includes a polarizer, which is disposed on the optical path between the light source and the entrance pupil area and is used to analyze the polarization of the illumination light provided by the light source, and only allows S-line polarized light to enter the interior of the illumination waveguide through the entrance pupil area.

[0014] Optionally, the imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence along the same optical axis; wherein, the first lens is located on the side close to the illumination waveguide, the sixth lens is located on the side close to the LCOS panel (4), and the imaging lens satisfies the following relationship:

[0015] -0.3 < ( f 1 + f 2 + f 4) / ( f 3 + f 5 + f 6) < 1.6;

[0016] Wherein, f 1 is the focal length of the first lens, f 2 is the focal length of the second lens, f 3 is the focal length of the third lens, f 4 is the focal length of the fourth lens, f 5 is the focal length of the fifth lens, f 6 is the focal length of the sixth lens.

[0017] Optionally, the optical powers of the first lens, the second lens, and the fourth lens are positive;

[0018] The optical powers of the third lens, the fifth lens, and the sixth lens are negative.

[0019] Optionally, the total focal length of the imaging lens is f , and the focal lengths of the respective lenses in the imaging lens and the total focal length f of the imaging lens (3) satisfy the following relationship:

[0020] f 1 / f > 2.6;

[0021] 0.9 <f 2 / f <1.1;

[0022] -0.95 < f 3 / f < -0.45;

[0023] 0.62 < f 4 / f <0.69;

[0024] -7.2 < f 5 / f < -2;

[0025] -1.7 < f 6 / f <9.4。

[0026] Optionally, the total focal length of the imaging lens is f , and the curvatures of the two surfaces of each lens in the imaging lens and the total focal length of the imaging lens (3) f satisfy the following relationship:

[0027] The ratio of the sum of the curvatures K1 and K2 of the two surfaces of the first lens to the total focal length of the imaging lens (3) f is -0.1 < (K1 + K2) / f < 0.1;

[0028] The ratio of the sum of the curvatures K3 and K4 of the two surfaces of the second lens to the total focal length of the imaging lens (3) f is -0.1 < (K3 + K4) / f < 0;

[0029] The ratio of the sum of the curvatures K5 and K6 of the two surfaces of the third lens to the total focal length of the imaging lens (3) f is -0.1 < (K5 + K6) / f < -0.05;

[0030] The ratio of the sum of the curvatures K7 and K8 of the two surfaces of the fourth lens to the total focal length of the imaging lens (3) f is -0.22 < (K7 + K8) / f < 0;

[0031] The ratio of the sum of the curvatures K9 and K 10 of the two surfaces of the fifth lens to the total focal length of the imaging lens (3) f is 0 < (K9 + K 10 ) / f < 0.05;

[0032] The curvatures of the two surfaces of the sixth lens K11 and K 12 The ratio of the sum of and the total focal length of the imaging lens (3) f is 0.2 < (K 11 + K 12 ) / f < 0.28.

[0033] Optionally, the first lens to the sixth lens in the imaging lens are all aspherical lenses.

[0034] Optionally, the aperture stop is a front aperture stop, the exit pupil distance H of the AR optical engine module is 0 < H < 3 mm, and the size pupil of the aperture stop is 2 mm < pupil < 5 mm.

[0035] Optionally, the image height D of the LCOS panel is D ≤ 8 mm, and the pixel size of the LCOS panel satisfies: pixel ≥ 2.5 μm.

[0036] Optionally, the total optical length L of the AR optical engine module is L ≤ 10.8 mm, and the FOV of the AR optical engine is FOV ≥ 70°.

[0037] Optionally, the light source includes an LED light source of natural light or a laser light source of polarized light.

[0038] In a second aspect, an embodiment of the present application provides an AR glasses. The AR glasses include:

[0039] A housing;

[0040] The AR optical engine module as described in the first aspect; and

[0041] A waveguide device, having a light coupling-in element and a light coupling-out element, where the light coupling-in element is located on the light output path of the aperture stop.

[0042] In a third aspect, an embodiment of the present application provides an AR display system. The AR display system includes the AR glasses as described in the second aspect.

[0043] In a fourth aspect, an embodiment of the present application provides an AR display method, using the AR optical engine module as described in the first aspect for imaging. The display method includes:

[0044] Illumination light provided by a light source, where the illumination light is S-line polarized light;

[0045] The illumination light is coupled into the illumination waveguide from the entrance pupil area and coupled out from the exit pupil area of the illumination waveguide to the imaging lens;

[0046] The illumination light is geometrically magnified by the imaging lens and then projected onto the LCOS panel;

[0047] After the illumination light exits through the LCOS panel, it is phase-modulated into P-line polarized light and forms imaging light;

[0048] The imaging light is magnified by the imaging lens and then exits from the exit pupil area to the aperture;

[0049] The imaging light exits from the aperture to an externally provided optical waveguide device to achieve projection imaging.

[0050] The beneficial effects of this application are as follows:

[0051] The AR optical engine module provided by the embodiment of this application improves the integration of the AR optical engine module by adopting a specific optical architecture design, especially the design of sharing the optical path between the illumination light and the imaging light, which is conducive to realizing the miniaturization and lightweight of the AR optical engine module; the introduced illumination waveguide effectively connects the illumination light and the imaging light, simplifies the optical path and reduces the light loss, and improves the light energy utilization rate.

[0052] The AR optical engine module effectively controls the polarization state of light through a polarization control component such as a polarization beam splitter film provided at the exit pupil, reduces stray light and reflected light, which can improve the image clarity and contrast; at the same time, the optical design of the AR optical engine module is also conducive to realizing a large field of view (FOV), providing a wider field of view range for users, and enhancing the immersion of the AR experience.

[0053] In addition, the setting of the aperture makes the exit pupil size of the AR optical engine module controllable, enhances the adaptability of the AR optical engine module to the externally provided optical waveguide device, ensures that the imaging light can be matched with the externally provided optical waveguide device, and thus is efficiently projected onto the user's eyes, further optimizing the visual experience.

[0054] Through the following detailed description of the exemplary embodiments of this specification with reference to the accompanying drawings, other features and advantages of this specification will become clear. Brief Description of the Drawings

[0055] The drawings incorporated in the specification and constituting a part of the specification illustrate the embodiments of this specification, and together with the description are used to explain the principles of this specification.

[0056] Figure 1 It is a schematic structural diagram of the AR optical engine module provided by the embodiment of this application;

[0057] Figure 2 It is a schematic diagram of the AR optical engine module provided by the embodiment of this application with an externally provided optical waveguide device;

[0058] Figure 3 It is one of the partial optical architecture diagrams of the AR optical engine module provided by the embodiment of this application;

[0059] Figure 4 For Figure 3 the provided optical distortion diagram of the AR optical engine module;

[0060] Figure 5 For Figure 3 the provided MTF diagram of the AR optical engine module;

[0061] Figure 6 For Figure 3 the provided lateral chromatic aberration diagram of the AR optical engine module;

[0062] Figure 7 FIG. II of the partial optical architecture diagram of the AR optical engine module provided by this application embodiment;

[0063] Figure 8 For Figure 7 the provided optical distortion diagram of the AR optical engine module;

[0064] Figure 9 For Figure 7 the provided MTF diagram of the AR optical engine module;

[0065] Figure 10 For Figure 7 the provided lateral chromatic aberration diagram of the AR optical engine module.

[0066] Explanation of reference numerals:

[0067] 1. Light source; 100. Illumination light ray;

[0068] 2. Illumination waveguide; 21. Entrance pupil area; 22. Exit pupil area;

[0069] 3. Imaging lens; 31. First lens; 32. Second lens; 33. Third lens; 34. Fourth lens; 35. Fifth lens; 36. Sixth lens; 300. Imaging light ray;

[0070] 4. LCOS panel;

[0071] 5. Diaphragm;

[0072] 6. Polarization control component

[0073] 61. Polarizing beam splitting film; 62. Polarizer;

[0074] 01. Optical waveguide device; 011. Optical coupling input element; 012. Optical coupling output element. Detailed implementation manners

[0075] Now, various exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0076] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present application, its application, or its use.

[0077] Technologies and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies and devices should be regarded as part of the specification.

[0078] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0079] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof in subsequent figures is not required.

[0080] The following, in conjunction with the accompanying drawings, provides a detailed description of the AR optical engine module, AR glasses, AR display system, and AR display method provided by the embodiments of the present application.

[0081] According to an embodiment of the present application, an AR optical engine module is provided. Refer to Figure 1 , the AR optical engine module includes a light source 1, an illumination waveguide 2, an imaging lens 3, an LCOS panel 4, a diaphragm 5, and a polarization control component 6; wherein, the light source is used to provide illumination light 100; the illumination waveguide 2 has an entrance pupil region 21 and an exit pupil region 22, and the illumination light 100 is coupled into the entrance pupil region 21 and coupled out from the exit pupil region 22; the imaging lens 3 is used to geometrically magnify the illumination light 100 coupled out from the exit pupil region 22; the LCOS panel 4 is used to perform phase modulation on the illumination light 100 magnified by the imaging lens 3 and form imaging light 300, and the imaging light 300 is then projected by the imaging lens 3 to the exit pupil region 22 and exits; the diaphragm 5 is disposed on the imaging light path of the imaging light exiting from the exit pupil region 22 and is used to adjust the exit pupil size; the polarization control component 6 includes a polarization beam splitting film 61, and the polarization beam splitting film 61 is located between the exit pupil region 22 and the diaphragm 5 and is used to reflect S-line polarized light and transmit P-line polarized light.

[0082] The AR optical engine module provided by the embodiments of the present application includes a light source 1. The light source 1 serves as the light source of the entire AR optical engine module and is mainly used to provide illumination light 100. The light source 1 can be an LED light source of natural light or a laser light source of polarized light, depending on the application scenario and performance requirements.

[0083] The AR optical engine module provided by the embodiments of the present application includes an illumination waveguide 2. The illumination waveguide 2 has an entrance pupil region 21 and an exit pupil region 22. Refer toFigure 1 The illumination light 100 provided by the light source 1 is coupled into the entrance pupil region 21, and after propagating through total internal reflection inside the illumination waveguide 2, it is coupled out from the exit pupil region 22. The design of the illumination waveguide 2 enables the illumination light 100 and the imaging light 300 to share the same optical path, simplifying the optical path structure and improving the integration degree of the optical architecture.

[0084] The AR optical engine module provided by the embodiment of the present application includes an imaging lens 3. The imaging lens 3 is located on one side of the exit pupil region 22 of the illumination waveguide 2 and is used to geometrically magnify the illumination light 100 coupled out from the exit pupil region 22. The design of the imaging lens 3 needs to ensure that after the light is magnified, it can be clearly projected onto, for example, the user's eyes to form a high-quality image.

[0085] The AR optical engine module provided by the embodiment of the present application includes an LCOS panel 4. The LCOS panel 4 serves as a light modulator and is used to perform phase modulation on the illumination light 100 magnified by the imaging lens 3 (which can change the S-line polarized light into P-line polarized light). The LCOS panel 4 realizes pixel-level modulated imaging by changing the phase of the light to form the imaging light 300.

[0086] The AR optical engine module provided by the embodiment of the present application includes a diaphragm 5. The diaphragm 5 is disposed on the imaging light path exiting from the exit pupil region 22 and can be used to adjust the exit pupil size of the AR optical engine module. The flexible setting of the diaphragm 5 enables the AR optical engine module to adapt to different application scenarios and user requirements, ensuring that the imaging light can be efficiently projected onto the user's eyes.

[0087] The AR optical engine module provided by the embodiment of the present application includes a polarization control component 6. The polarization control component 6 includes a polarization beam splitting film 61, and the polarization beam splitting film 61 is located between the exit pupil region 22 of the illumination waveguide 2 and the diaphragm 5. The function of the polarization beam splitting film 61 is, for example, to reflect S-line polarized light and transmit P-line polarized light. This design effectively controls the polarization state of the light, reduces the influence of stray light and reflected light on the imaging quality, and improves the clarity and contrast of the image.

[0088] See Figure 2 For the AR optical engine module provided by the embodiment of the present application, the imaging light 300 emitted therefrom, that is, the imaging light 300 emitted through the diaphragm 5, will pass through an optical waveguide device 01 for transmission. Specifically, this optical waveguide device 01 has an optical coupling-in element 011 and an optical coupling-out element 012, and it is responsible for efficiently and accurately transmitting the imaging light 300 emitted from the exit pupil of the AR optical engine module via the diaphragm 5 to the user's eyes, thereby ensuring that the user can clearly view the presented image. This design not only optimizes the light transmission path but also greatly improves the user's visual experience.

[0089] It should be noted that, referring to Figure 1 and Figure 2 , the AR optical engine module provided by the embodiments of the present application includes an illumination waveguide 2, and the introduction of this illumination waveguide 2 realizes the sharing of the optical path between the illumination light 100 and the imaging light 300. This illumination waveguide 2 is not the waveguide that transmits the imaging light to the human eye in a traditional optical engine system.

[0090] For the AR optical engine module provided by the embodiments of the present application, referring to Figure 1 and Figure 2 , the working process is as follows:

[0091] Illumination process: The illumination light 100 emitted by the light source 1 is projected onto the entrance pupil area 21 of the illumination waveguide 2, and after total internal reflection inside the illumination waveguide 2, it is coupled out from the exit pupil area 22.

[0092] Imaging process: The illumination light 100 coupled out from the exit pupil area 22 of the illumination waveguide 2 is geometrically magnified by the imaging lens 3 and then projected onto the LCOS panel 4. The LCOS panel 4 can perform phase modulation on the light (for example, changing the S-line polarization to P-line polarization) to form the imaging light 300. The imaging light 300 is reflected, magnified, and adjusted by the imaging lens 3 and then projected onto the exit pupil area 22.

[0093] Polarization control: During the process of the imaging light 300 being projected onto the exit pupil area 22 of the illumination waveguide 2, the polarization beam splitter film 61 reflects the S-line polarized light and transmits the P-line polarized light to ensure that only the light meeting the polarization requirements can continue to propagate.

[0094] Exit pupil adjustment: Finally, the imaging light 300 is adjusted by the aperture 5 and then exits to an external optical waveguide device 01 (for transmitting the imaging light to a target position such as the human eye), please refer to Figure 2 , to form the final imaging effect. The setting of the aperture 5 can adjust the exit pupil size according to actual needs to ensure that the imaging light can be efficiently projected onto the user's eyes.

[0095] Among them, the polarization beam splitter film 61 (PBS film) can be supported between the exit pupil area 22 of the illumination waveguide 2 and the aperture 5 by a light-transmitting flat plate. The size of the polarization beam splitter film 61 can match the exit pupil area 22.

[0096] The optical propagation path of the AR optical engine module provided by the embodiments of the present application is as follows, referring to Figure 1 :

[0097] The light source 1 emits illumination light 100 (S-line polarized light) → the illumination light (S-line polarized light) enters the entrance pupil area 21 of the illumination waveguide 2 → the illumination light (S-line polarized light) exits from the exit pupil area 22 of the illumination waveguide 2, passes through the imaging lens 3 to shape and match the illumination spot to the LCOS panel 4 → the illumination light (S-line polarized light) becomes imaging light 300 (P-polarized light) after passing through the LCOS panel 4 for incidence and exit → the imaging light 300 (P-polarized light) is magnified and imaged through the imaging lens 3 → the imaging light 300 (P-polarized light) exits successively through the exit pupil area 22 and the aperture 5.

[0098] The AR optical engine module provided by the embodiment of the present application has the characteristic of high integration. Refer to Figure 1 , the design of sharing the optical path between the illumination light 100 and the imaging light 300 significantly improves the integration of the AR optical engine module and reduces the complexity and volume of the optical architecture. Specifically:

[0099] First, the illumination light 100 and the imaging light 300 share the optical path, which means that the illumination part and the imaging part can share some optical elements, such as sharing optical elements like the illumination waveguide 2 and the imaging lens 3, thus reducing the number of optical elements. This design significantly improves the integration of the AR optical engine module.

[0100] Second, by sharing the optical path, the optical paths of illumination and imaging can be combined into one main line, avoiding the complexity brought by the separation of the illumination optical path and the imaging optical path in the traditional design and simplifying the overall optical architecture.

[0101] Furthermore, since the illumination light 100 and the imaging light 300 share the optical path, the layout of the entire optical system is more compact, reducing the volume of the AR optical engine module. This is particularly important for devices such as AR glasses that have extremely high requirements for volume and weight.

[0102] In the traditional design, the illumination part and the imaging part usually require independent spatial layouts. However, the shared optical path design in the present application can significantly reduce the space occupation, making the optical engine module thinner and lighter.

[0103] In the traditional design, the illumination optical path and the imaging optical path need to be aligned separately, increasing the difficulty of optical debugging. The shared optical path design makes the optical path alignment simpler and reduces the complexity of the optical system.

[0104] In addition, since the illumination light 100 and the imaging light 300 share the optical path, the entire AR optical engine module only needs to perform aberration correction for one optical path, reducing the difficulty and cost of aberration correction.

[0105] In the AR optical engine module provided by the embodiments of the present application, the material of the illumination waveguide 2 needs to have high light transmittance and low scattering characteristics to reduce light loss in the optical path and ensure the transmission efficiency of the illumination light 100 and the imaging light 300.

[0106] In the AR optical engine module provided by the embodiments of the present application, the LCOS panel 4 performs phase modulation on the S-line polarized light and converts it into P-line polarized light, thereby realizing the formation of the imaging light 300. This design enables the illumination light 100 and the imaging light 300 to achieve efficient conversion in the common optical path.

[0107] In the AR optical engine module provided by the embodiments of the present application, the polarization beam splitting film 61 (PBS film) is used to reflect the S-line polarized light and transmit the P-line polarized light. This polarization control design ensures the efficient transmission and separation of the illumination light 100 and the imaging light 300 in the common optical path.

[0108] The AR optical engine module design provided by the embodiments of the present application has a simple and compact optical architecture, which is conducive to the miniaturization of the optical engine volume. By optimizing the design of the optical system and the layout of the optical components, it is also conducive to achieving an imaging effect with an increased field of view angle, thereby being able to provide a wider field of view range for users and enhancing the immersion of the AR visual experience. The introduction of the polarization control component 6 effectively controls the polarization state of the light, reduces the influence of stray light and reflected light on the imaging quality, and improves the clarity and contrast of the image. The flexible setting of the aperture 5 enables the AR optical engine module to adapt to different application scenarios and user requirements, improving the adaptability and flexibility of the module.

[0109] In some examples of the present application, the image height of the LCOS panel 4 is D, the total optical length of the AR optical engine module is L, and the ratio D / L between the two satisfies: 0.6 < D / L < 0.8.

[0110] In the design of the AR optical engine module, the image height D of the LCOS panel directly determines the size of the imaging picture, while the total optical length L reflects the size of the entire AR optical engine module in the optical axis direction. The requirement for the D / L ratio proposed in the embodiments of the present application is 0.6 < D / L < 0.8, which is an important design constraint aimed at optimizing the balance between the performance and volume of the AR optical engine module.

[0111] By restricting the D / L ratio between 0.6 and 0.8, the total optical length L of the AR optical engine module of the present application can be effectively controlled on the premise of ensuring a certain imaging picture size (i.e., the image height D). This means that the AR optical engine module can provide a sufficiently large field of view angle and an imaging picture with better visual effects while maintaining a small volume, thus achieving a good balance between miniaturization and high performance.

[0112] A smaller overall optical length helps to miniaturize and lighten the AR optical engine module, thereby enabling the miniaturization and lightening of wearable devices such as AR glasses, making it more comfortable for users to wear and less likely to cause fatigue during long-term use. At the same time, a sufficient imaging screen size ensures that users can clearly see AR content, enhancing the immersion and realism of the visual experience.

[0113] The limitation of the D / L ratio provides clear guidance for optical design. Under the premise of meeting this ratio requirement, optical designers can further improve the optical performance of the optical engine module by optimizing parameters such as lens material, curvature, and thickness, such as reducing distortion, increasing the MTF value, and reducing chromatic aberration.

[0114] Furthermore, the image height of the LCOS panel 4 is D, the overall optical length of the AR optical engine module is L, and the ratio D / L between the two satisfies: 0.6 < D / L < 0.7. This constraint aims to further optimize the balance between the performance and volume of the AR optical engine module to meet higher standards.

[0115] When D / L is less than 0.6, the imaging screen will be too small. A smaller D / L ratio means that at the same overall optical length, the image height of the LCOS panel 4 is smaller, resulting in an overly small imaging screen size. This may affect the user's visual perception of AR content. Especially in scenarios where a large amount of information or complex graphics need to be displayed, an overly small screen may not provide sufficient details and clarity. In addition, in order to achieve a sufficient field of view and imaging quality at a smaller image height, the optical design may need to adopt more complex lens combinations and more advanced optical materials, thereby increasing the design difficulty and manufacturing cost.

[0116] When D / L is greater than 0.7 (including the case of greater than 0.8), at this time, the volume of the AR optical engine module will be relatively large. This is because a larger D / L ratio means that at the same image height, the overall optical length is larger, resulting in an overly large volume of the AR optical engine module. This may affect the portability and comfort of wearable devices, especially in scenarios where long-term wearing is required. In addition, although a larger image height helps to provide a larger imaging screen, an overly large overall optical length may also lead to an increase in aberrations and distortions of the optical system, thereby affecting the imaging quality. Especially at the edge field of view, obvious image distortion and blurring may occur.

[0117] It can be seen that by limiting the ratio between the image height of the LCOS panel 4 and the overall optical length L of the AR optical engine module within the range of 0.6 < D / L < 0.8, it is possible to effectively control the volume and weight of the AR optical engine module while ensuring a certain imaging screen size, achieving a good balance between miniaturization and high performance.

[0118] In some examples of this application, seeFigure 1 The polarization control component further includes a polarizer 62, which is disposed on the optical path between the light source 1 and the entrance pupil region 21, and is used to analyze the polarization of the illumination light 100 provided by the light source 1, and only allows the S-line polarized light to enter the interior of the illumination waveguide 2 through the entrance pupil region 21.

[0119] In this example of the present application, refer to Figure 1 The polarization control component 6 not only includes a polarization beam splitting film 61, but also adds a polarizer 62 (POL). The polarizer 62 is disposed on the optical path between the light source 1 and the entrance pupil region 21 of the illumination waveguide 2. Its main function is to analyze the polarization of the illumination light 100 provided by the light source 1, and only allows the S-line polarized light to enter the interior of the illumination waveguide 2 through the entrance pupil region 21.

[0120] For example, the polarizer 62 can be mounted on the entrance pupil region 21.

[0121] Of course, the polarizer 62 can also be disposed on the light-emitting surface of the light source 1.

[0122] As a part of the polarization control component 6, the polarizer 62 can effectively filter out non-S-line polarized light components, ensuring that only high-purity S-line polarized light enters the interior of the illumination waveguide 2 for propagation. This helps to improve the polarization efficiency and imaging quality of the subsequent optical system, and reduces the interference of stray light and reflected light caused by polarization impurity on the imaging quality.

[0123] By strictly controlling the polarization state of the light entering the illumination waveguide 2, the polarizer 62 helps to reduce the performance fluctuation of the optical system caused by the change of the light polarization state. This can enhance the stability and reliability of the AR optical engine module under different environments and usage conditions.

[0124] Only allowing the S-line polarized light to enter the illumination waveguide 2 through the entrance pupil region 21 means that the energy in the illumination light 100 is more concentrated for the imaging process, reducing the energy waste caused by polarization loss. This helps to improve the illumination efficiency of the AR optical engine module and reduce the power consumption.

[0125] The function of the polarizer 62 ensures that the polarization state of the illumination light 100 matches the polarization requirements of the subsequent optical systems such as the LCOS panel 4 and the polarization beam splitting film 61, thus helping to reduce adverse phenomena such as ghosting and glare during the imaging process. This can improve the user's visual experience and enhance the realism and immersion of the AR display content.

[0126] In this example of the present application, the polarizer 62 added plays an important role in the AR optical engine module. By improving the polarization purity of light, enhancing the optical stability of the module, optimizing the illumination efficiency, and improving the visual experience, etc., it provides better performance and a broader application prospect for the AR optical engine module.

[0127] In some examples of the present application, referring to Figure 2 and Figure 6 , the imaging lens 3 includes a first lens 31, a second lens 32, a third lens 33, a fourth lens 34, a fifth lens 35, and a sixth lens 36 arranged in sequence along the same optical axis; wherein, the first lens 31 is located on the side close to the illumination waveguide 2, the sixth lens 36 is located on the side close to the LCOS panel 4, and the imaging lens 3 satisfies the following relationship:

[0128] -0.3 < (( f 1 + f 2 + f 4) / ( f 3 + f 5 + f 6)) < 1.6;

[0129] wherein, f 1 is the focal length of the first lens 31, f 2 is the focal length of the second lens 32, f 3 is the focal length of the third lens 33, f 4 is the focal length of the fourth lens 34, f 5 is the focal length of the fifth lens 35, f 6 is the focal length of the sixth lens 36.

[0130] In this example of the present application, referring to Figure 2 and Figure 6 , the imaging lens 3 includes six lenses.

[0131] Of course, in other examples of the present application, the number of lenses included in the imaging lens 3 can be adjusted as needed, and is not limited to the six lenses in the example.

[0132] By adjusting the number of lenses in the imaging lens, the imaging quality can be improved.

[0133] By controlling the proportional relationship between the focal lengths of the six lenses, the aberration in the imaging lens 3 can be effectively balanced. In particular, the reasonable combination of positive and negative optical power lenses (such as the first lens 31, the second lens 32, and the fourth lens 34 have positive optical power, and the third lens 33, the fifth lens 35, and the sixth lens 36 have negative optical power) can significantly reduce chromatic aberration, thereby improving the imaging quality.

[0134] The optimized focal length relationship helps ensure that the imaging lens 3 can provide clear imaging at different field angles of view. This can not only improve the resolution of the AR display content, but also reduce the blurring and distortion phenomena at the image edges, thereby enhancing the user's visual experience.

[0135] The lens combination that satisfies the above focal length relationship can achieve a more compact optical design while ensuring the imaging quality. This is crucial for the miniaturization of the AR optical engine module and helps improve the portability and comfort of wearable devices.

[0136] In some examples of the present application, please continue to refer to Figure 2 and Figure 6 , the optical powers of the first lens 31, the second lens 32, and the fourth lens 34 are positive; the optical powers of the third lens 33, the fifth lens 35, and the sixth lens 36 are negative.

[0137] In the example of the present application, the imaging lens 3 can be composed of six lenses. Among them, the optical powers of the first lens 31, the second lens 32, and the fourth lens 34 are set to be positive, while the optical powers of the third lens 33, the fifth lens 35, and the sixth lens 36 are set to be negative. Different lenses use different materials, and the combination of positive and negative optical powers is beneficial to reducing imaging chromatic aberration.

[0138] The alternating use of positive and negative optical power lenses can effectively correct the aberrations in the AR optical engine module. The positive optical power lens has the effect of converging light rays, while the negative optical power lens has the effect of diverging light rays. By reasonably matching these two types of lenses, the converging and diverging trends of light rays during the imaging process can be balanced, thereby reducing aberration phenomena such as spherical aberration and chromatic aberration and improving the imaging quality.

[0139] Since the chromatic aberration is effectively corrected, the imaging lens 3 can provide better-quality imaging at a wider field angle of view. This is crucial for AR display applications because AR devices usually need to provide a large field angle of view to enhance the user's immersion.

[0140] Generally speaking, the optical power of the imaging lens 3 needs to be optimized to ensure that the illumination light ray 100 and the imaging light ray 300 can be correctly magnified and focused in the common optical path. For example, the optical power distribution (combination of positive and negative optical powers) of the six lenses mentioned in this example of the present application is to correct aberrations and optimize the optical path.

[0141] In some examples of the present application, the total focal length of the imaging lens 3 is f , and the focal lengths of the respective lenses in the imaging lens 3 and the total focal length f of the imaging lens 3 satisfy the following relationship:

[0142] f 1 / f > 2.6;

[0143] 0.9 < f 2 / f < 1.1;

[0144] -0.95 < f 3 / f < -0.45;

[0145] 0.62 < f 4 / f < 0.69;

[0146] -7.2 < f 5 / f < -2;

[0147] -1.7 < f 6 / f < 9.4。

[0148] These constraint conditions in this example of the present application have important impacts on aspects such as the optical performance, production and assembly, and miniaturization design of the imaging lens 3. Specifically:

[0149] (1) The optical power distribution of each lens in the imaging lens 3 is uniform:

[0150] These constraint conditions in this example of the present application ensure that the optical power distribution of the six lenses in the imaging lens 3 is relatively uniform. The light correction capabilities borne by each lens are generally equivalent, which helps to improve the lens tolerance sensitivity of the opto-mechanical design. In optical design, the lens tolerance sensitivity is an important indicator, which reflects the influence degree of lens manufacturing errors on the overall performance of the system. By reasonably distributing the optical power of each lens, the influence of manufacturing errors on the imaging quality can be reduced, thereby improving the production efficiency and the yield rate.

[0151] (2) Facilitate the miniaturization of the volume of the AR opto-mechanical module:

[0152] On the premise of meeting the imaging quality, these constraint conditions in this example of the present application also help to realize the miniaturization design of the AR opto-mechanical module. By optimizing the focal lengths and optical power distributions of the six lenses in the imaging lens 3, the overall volume and weight of the AR opto-mechanical module can be reduced while ensuring the imaging performance. This is of great significance for improving the portability and user experience of AR devices.

[0153] In this example of the present application, the focal lengths of the lenses in the imaging lens 3 and the total focal length of the imaging lens 3 fThe constraint relationship between them realizes technical effects such as uniform distribution of optical power, improved sensitivity of lens tolerance, and facilitation of miniaturization of the AR optical engine by reasonably distributing the optical power of each lens. These constraint conditions in this example of the present application not only reflect the optimization of the optical performance of the imaging lens, but also provide a design idea for the miniaturization and high-performance design of the AR optical engine module.

[0154] In some examples of the present application, the total focal length of the imaging lens 3 is f , and the curvature of the two surfaces of each lens in the imaging lens 3 and the total focal length of the imaging lens 3 f satisfy the following relationship:

[0155] The ratio of the sum of the curvatures K1 and K2 of the two surfaces of the first lens 31 to the total focal length of the imaging lens 3 f is -0.1 < (K1 + K2) / f < 0.1;

[0156] The ratio of the sum of the curvatures K3 and K4 of the two surfaces of the second lens 32 to the total focal length of the imaging lens 3 f is -0.1 < (K3 + K4) / f < 0;

[0157] The ratio of the sum of the curvatures K5 and K6 of the two surfaces of the third lens 33 to the total focal length of the imaging lens 3 f is -0.1 < (K5 + K6) / f < -0.05;

[0158] The ratio of the sum of the curvatures K7 and K8 of the two surfaces of the fourth lens 34 to the total focal length of the imaging lens 3 f is -0.22 < (K7 + K8) / f < 0;

[0159] The ratio of the sum of the curvatures K9 and K 10 of the two surfaces of the fifth lens 35 to the total focal length f is 0 < (K9 + K 10 ) / f < 0.05;

[0160] The ratio of the sum of the curvatures K 11 and K 12 of the two surfaces of the sixth lens 36 to the total focal length f is 0.2 < (K 11 + K 12 ) / f < 0.28.

[0161] In this example of the present application, these constraints have had a positive impact on aspects such as the optical performance, production assembly, and miniaturization design of the imaging lens 3.

[0162] Specifically, these constraints in this example of the present application ensure a relatively uniform surface shape distribution of each lens in the imaging lens 3. The ratio of the sum of the curvatures of the two surfaces of each lens to the total focal length f is constrained within a reasonable range, making the position and role of each lens in the optical path more balanced. This balanced distribution helps each lens undertake a comparable aberration correction ability, thereby improving the optical performance of the entire imaging system.

[0163] The uniform surface shape distribution of each lens also helps to improve the lens tolerance sensitivity of the AR optical engine module design. In optical design, lens tolerance sensitivity is an important indicator, which reflects the degree of influence of lens manufacturing errors on the overall performance of the AR optical engine module. By optimizing the surface shape distribution of each lens, the impact of manufacturing errors on the imaging quality can be reduced, thereby improving production efficiency and the yield rate.

[0164] Since the surface shape distribution of each lens is uniform and each lens undertakes a comparable aberration correction ability, the assembly relationship between the lenses is also clearer and more stable. This helps to simplify the production assembly process and improve the assembly efficiency. At the same time, the stable assembly relationship also helps to reduce errors during the assembly process, further improving the imaging quality.

[0165] The curvatures of each lens in the imaging lens 3 are designed according to this constraint, which is also beneficial to the processing and manufacturing of the lenses. A reasonable curvature distribution can reduce the processing difficulty and cost, and improve the yield rate of the lenses. In addition, this curvature constraint also helps to reduce the thickness of each lens, thereby realizing the miniaturization design of the AR optical engine while achieving high-performance imaging. This is of great significance for enhancing the portability and user experience of AR devices.

[0166] It should be noted specifically that in the imaging lens 3, the curvatures of the surfaces of each lens are clearly defined. Taking the first lens 31 as an example, the curvature of its first surface is denoted as K1, and the curvature of the second surface is denoted as K2. Please refer to Figure 2 and Figure 6 , where the first surface is the left surface of the first lens 31, and the second surface is the right surface of the first lens 31. By analogy, the surface curvatures of other lenses also follow the same naming rule.

[0167] In some examples of the present application, the first lens 31 to the sixth lens 36 in the imaging lens 3 are all aspherical lenses.

[0168] The imaging lens 3 has a positive optical power. For example, it may include six lenses, and all the lenses are aspherical lenses. This design choice has significant technical effects, which are mainly reflected in the following aspects:

[0169] (1) Compared with traditional spherical lenses, aspherical lenses have more advantages in optical performance, can better correct aberrations, and improve imaging quality. However, the processing difficulty of aspherical lenses is relatively high. By using molds for production and processing, the manufacturing efficiency and consistency of aspherical lenses can be greatly improved, which is conducive to realizing mass production. This is of great significance for reducing production costs and improving production efficiency.

[0170] Mass production can not only reduce the cost of a single lens, but also improve the production efficiency of the entire imaging lens 3 and even the AR optical engine.

[0171] (2) In the AR optical engine module of the present application, by adopting the aspherical lens design for the imaging lens 3, the large FOV target can be achieved with only six lenses while ensuring imaging quality. For example, the FOV of the AR optical engine module can reach 70°, or even larger. While achieving a large FOV, the number of lenses is greatly reduced, and the complexity of the optical engine structure is reduced, which is conducive to cost reduction.

[0172] Reducing the number of lenses means reducing material costs, processing costs, and assembly costs. At the same time, a simpler optical engine structure also helps to improve production efficiency and yield, further reducing production costs.

[0173] (3) The design of aspherical lenses can more precisely control the path and focus point of light, thereby reducing the thickness of the lenses while ensuring imaging quality. This is of great significance for realizing the miniaturized design of the AR optical engine. Using aspherical lenses can also optimize the internal structure layout of the optical engine, making the entire optical engine more compact and lightweight. This is of great significance for improving the portability and user experience of AR devices.

[0174] In some examples of the present application, referring to Figure 1 , the aperture stop 5 is a front aperture stop, the exit pupil distance H of the AR optical engine module satisfies 0 < H < 3 mm, and the size pupil of the aperture stop 5 satisfies 2 mm < pupil < 5 mm.

[0175] The aperture stop 5 is a front aperture stop.

[0176] Specifically, referring to Figure 1 , the aperture stop 5 is located at the very front end of the entire AR optical engine module, that is, in front of the illumination waveguide 2 and the polarization beam splitter film 61.

[0177] The exit pupil distance H satisfies 0 < H < 3 mm, which is the distance limit from the aperture stop 5 to the first surface of the AR optical engine module (this first surface is the surface of the illumination waveguide 2 close to the aperture stop 5).

[0178] The size of the aperture stop 5, pupil, satisfies 2 mm < pupil < 5 mm: This is the limitation on the aperture size of the aperture stop.

[0179] In this example of the present application, the exit pupil distance H of the optical engine module matches the entrance pupil of the external light waveguide device 01 (i.e., the size of the optical coupling element 011).

[0180] Due to the front - end design of the aperture stop 5 and the limitation of the exit pupil distance H of the optical engine, the exit pupil of the AR optical engine module provided by the present application can be well - matched with the entrance pupil of conventional light waveguide devices in the industry. This matching is crucial for ensuring that light can be efficiently coupled into the light waveguide device and transmitted in the light waveguide device. For the light waveguide device here, please refer to Figure 1 the light waveguide device 01 shown on the left in [], which has a different function from the illumination waveguide 2 included in the AR optical engine module of the present application.

[0181] The limitation of the size pupil of the aperture stop 5 ensures that the light does not diverge or concentrate too much when passing through the aperture stop 5, thereby improving the coupling efficiency between the light and the external light waveguide. This helps to reduce light loss and improve the overall efficiency of the AR optical engine module.

[0182] The limitation of the exit pupil distance H provides sufficient space for the assembly between the AR optical engine module and the external light waveguide device. This helps to reduce the assembly difficulty, improve the assembly accuracy and ensure the stability after assembly.

[0183] Through the limitations of the constraint conditions in this example of the present application, the efficient coupling and stable transmission between the AR optical engine module and the external light waveguide device 01 are ensured. This provides a basic condition for achieving high - quality optical display.

[0184] In some examples of the present application, the image height D of the LCOS panel 4 satisfies D ≤ 8 mm, and the pixel size of the LCOS panel 4 satisfies: pixel ≥ 2.5 μm.

[0185] The image height D of the LCOS panel 4 satisfies D ≤ 8 mm: This is the limitation on the height of the imaging area of the LCOS panel 4.

[0186] The pixel size pixel of the LCOS panel 4 satisfies pixel ≥ 2.5 μm: This is the minimum limitation on the size of a single pixel on the LCOS panel, ensuring that each pixel has sufficient size to meet the display and imaging requirements.

[0187] By limiting the image height of the LCOS panel 4 within 8 mm, it helps to achieve the miniaturized design of the AR optical engine module. This is crucial for improving the portability and comfort of AR devices, especially in the field of wearable devices. At the same time, ensuring that the pixel size is not less than 2.5 μm can achieve a relatively high pixel density while guaranteeing the display quality, thereby providing a clear and delicate image display. This helps to enhance the user's visual experience, especially in application scenarios that require high-resolution displays.

[0188] By precisely controlling the image height and pixel size of the LCOS panel 4, a high-resolution LCOS panel 4 can be provided. Through the optical design provided by this application, it can ensure the good matching of the high-resolution LCOS panel 4 with the entire optical system (including the imaging lens 3, the illumination waveguide 2, etc.). This helps to optimize the optical performance and improve the imaging quality. For example, in this application, the use of a high-resolution LCOS panel 4 and a precise imaging lens 3 design ensures the high resolution and clarity of the imaging light 300.

[0189] In some examples of this application, the total optical length L of the AR optical engine module ≤ 10.8 mm, and the FOV of the AR optical engine ≥ 70°.

[0190] The total optical length L of the AR optical engine module ≤ 10.8 mm, which is a limitation on the overall length of the AR optical engine module, that is, the length of the entire optical architecture (including components such as lenses, LCOS panels, and illumination waveguides) can not exceed 10.8 mm. The FOV of the AR optical engine ≥ 70°, which indicates that the range of virtual images that users can see through AR glasses should be not less than 70°.

[0191] By limiting the total optical length of the AR optical engine module within 10.8 mm, the miniaturized design of the AR device is achieved. This is crucial for improving the portability and comfort of AR devices, especially in the field of wearable devices. At the same time, ensuring that the field of view angle is not less than 70° provides users with a wide field of view range, enhancing the sense of virtual-real fusion and immersion. The wide-angle design enables users to obtain rich virtual information without frequently moving their heads, improving the user experience.

[0192] Achieving a field of view angle of more than 70° within such a compact optical space requires very high optical design techniques. This application realizes this goal by adopting aspherical lenses, optimizing the lens combination and optical path design, etc., reflecting the advancement of technical implementation.

[0193] In some examples of this application, the light source 1 includes an LED light source of natural light or a laser light source of polarized light.

[0194] The LED light source of natural light is a semiconductor light-emitting device that emits light by exciting the electron transition in the semiconductor material through current. The LED light source of natural light refers to a light source that emits a light source close to the natural spectral distribution. The LED light source has the advantages of high efficiency, long life, low power consumption, small volume and light weight.

[0195] The laser light source of polarized light is a light source that generates coherent light through stimulated emission, and the emitted light has high directivity and coherence. The laser light source of polarized light refers to a laser light source that emits light with a specific polarization state (such as S-line polarized light or P-line polarized light). The laser light source has the advantages of high brightness, good monochromaticity, strong directivity and good coherence.

[0196] By providing two different types of light source options (LED light source and laser light source), the AR optical engine module design of this application can adapt to a wider range of application scenarios and requirements. For example, in applications that require high brightness and high contrast display, a laser light source can be selected; while in applications with strict requirements on the volume, weight and power consumption of the light source, an LED light source can be selected.

[0197] Whether it is an LED light source or a laser light source, it can provide stable and uniform illumination for the LCOS panel. Due to its high brightness and high coherence, the laser light source can further improve the contrast and clarity of the image. The LED light source, on the other hand, helps to provide more realistic color reproduction through its light close to the natural spectral distribution.

[0198] The applicable scope of the AR optical engine module provided by the embodiment of this application includes:

[0199] Wavelength range: Applicable to full-color AR LCOS optical engines in the visible light wavelength range.

[0200] Imaging lens matching parameters: The image height matched by the imaging lens 3 does not exceed 8 mm, that is, it is applicable to the LCOS panel 4 with a size of 0 to 0.32 inches; the Nyquist frequency matched by the imaging lens 3 does not exceed 200 lp / mm; Pixel size of the LCOS panel 4: The pixel size of the LCOS panel 4 matched by the imaging lens 3 is not less than 2.5 μm.

[0201] According to an embodiment of this application, an AR glasses is provided. Refer to Figure 2 , the AR glasses include: a housing, the AR optical engine module as described above, and an optical waveguide device 01; wherein, the optical waveguide device 01 has an optical coupling input element 011 and an optical coupling output element 012, and the optical coupling input element 011 is located on the light output path of the diaphragm 5.

[0202] In a specific example, the optical waveguide device 01 and the AR optical engine module can both be two in number, corresponding to the left eye and the right eye of the user respectively.

[0203] According to another embodiment of the present application, an AR display system is provided, and the AR display system includes the AR glasses as described above.

[0204] It should be noted that, in addition to the AR glasses themselves, the AR display system may further include key components or subsystems such as a processing unit, a sensor module, a power management module, a display controller, an input / output device, a communication module, and an operating system and application software. These components and subsystems cooperate together to achieve high-quality augmented reality display effects and rich user experiences.

[0205] According to still another embodiment of the present application, an AR display method is provided, which uses the above-mentioned AR optical engine module for imaging. Refer to Figure 1 and Figure 2 , and the display method includes the following steps:

[0206] The illumination light ray 100 provided by the light source 1, and the illumination light ray 100 is S-line polarized light.

[0207] The illumination light ray 100 is coupled into the illumination waveguide 2 from the entrance pupil region 21, and is coupled out from the exit pupil region 22 of the illumination waveguide 2 to the imaging lens 3.

[0208] After the illumination light ray 100 is geometrically magnified by the imaging lens 3, it is projected onto the LCOS panel 4.

[0209] After the illumination light ray 100 exits from the LCOS panel 4, it is phase-modulated into P-line polarized light and forms an imaging light ray 300.

[0210] The imaging light ray 300 is magnified by the imaging lens 3, and then exits from the exit pupil region 22 to the aperture 5.

[0211] The imaging light ray 300 exits from the aperture 5 to the external optical waveguide device 01 to achieve projection imaging.

[0212] The AR display method provided by the embodiments of the present application uses the above-mentioned AR optical engine module for imaging, and its beneficial effects are mainly reflected in the following aspects:

[0213] (1) By realizing the coupling-in and coupling-out of the illumination light ray 100 through the entrance pupil region 21 and the exit pupil region 22 of the illumination waveguide 2, the transmission efficiency of light energy is effectively improved, and light loss is reduced. The imaging lens 3 geometrically magnifies the illumination light ray 100 and projects it onto the LCOS panel 4, ensuring that the light can evenly illuminate the panel and improving the imaging quality.

[0214] (2) The illumination light 100 enters the illumination waveguide 2 and the imaging lens 3 as S-line polarized light, and is phase-modulated into P-line polarized light after passing through the LCOS panel 4. This process realizes the precise control and conversion of polarized light, helps to reduce light crosstalk and interference, and improves the contrast and clarity of imaging.

[0215] (3) The optical architecture adopted by this display method is compact. By reasonably designing the parameters of the imaging lens and the illumination waveguide, the miniaturization of the optical engine module is achieved, which is convenient for application in portable devices such as AR glasses.

[0216] (4) This method is applicable to full-color AR LCOS optical engines in the visible light wavelength range, and can match LCOS panels of various specifications, including panels with an image height not exceeding 8 mm and a Nyquist frequency not exceeding 200 lp / mm, with strong versatility and adaptability.

[0217] (5) After two magnifications by the imaging lens 3 and the outgoing imaging of the aperture, the imaging light can form a clear and bright image, meeting the high requirements for imaging quality in AR displays.

[0218] This display method adopts an optical path design that combines illumination and imaging, simplifies the structure of the optical system, reduces the manufacturing difficulty and cost, and improves the reliability and stability of the system at the same time.

[0219] The AR optical engine module of the present application is described below through Embodiment 1 and Embodiment 2 respectively.

[0220] Embodiment 1

[0221] See Figure 1 , the AR optical engine module includes a light source 1, an illumination waveguide 2, an imaging lens 3, an LCOS panel 4, an aperture 5 and a polarization control component 6;

[0222] The light source 1 is used to provide illumination light 100;

[0223] The illumination waveguide 2 has an entrance pupil region 21 and an exit pupil region 22, and the illumination light 100 is coupled into from the entrance pupil region 21 and coupled out from the exit pupil region 22;

[0224] The imaging lens 3 is used to geometrically magnify the illumination light 100 coupled out from the exit pupil region 22; See Figure 3 , the imaging lens 3 includes a first lens 31, a second lens 32, a third lens 33, a fourth lens 34, a fifth lens 35 and a sixth lens 36 arranged in sequence along the same optical axis; among them, the first lens 31 is located on the side close to the illumination waveguide 2, and the sixth lens 36 is located on the side close to the LCOS panel 4;

[0225] The LCOS panel 4 is configured to perform phase modulation on the illumination light 100 magnified by the imaging lens 3 and form imaging light 300, and the imaging light 300 is then projected by the imaging lens 3 to the exit pupil area 22 and exits;

[0226] The aperture stop 5 is disposed on the imaging light path exiting from the exit pupil area 22 for adjusting the exit pupil size;

[0227] The polarization control component 6 includes a polarization beam splitting film 61 and a polarizer 62. The polarization beam splitting film 61 is located between the exit pupil area 22 and the aperture stop 5 and is configured to reflect S-line polarized light and transmit P-line polarized light. The polarizer 62 is disposed on the light path between the light source 1 and the entrance pupil area 21 for analyzing the polarization of the illumination light 100 provided by the light source 1, and only allows S-line polarized light to enter the interior of the illumination waveguide 2 through the entrance pupil area 21.

[0228] This Embodiment 1 is based on a 1600*1600*3μm LCOS panel, and the FOV of the entire AR optical engine module is 70°; the size pupil of the aperture stop 5 is 2 mm, and the F number = 2.7; the total focal length of the imaging lens 3 is 5.4 mm; the total optical length of the AR optical engine module is 10.4 mm (distance from the pupil plane to the image plane).

[0229] The specific parameters of the AR optical engine module provided in this Embodiment 1 are shown in Table 1 below, which includes the radius of curvature, thickness, glass material, and semi-aperture of the lens.

[0230] Table 1

[0231]

[0232] For the AR optical engine module provided in this Embodiment 1, see Figure 4 , its optical distortion diagram shows that its optical distortion rate is controlled within 10%, and this optical performance fully meets the extremely high requirements of the human eye for imaging quality in a large field of view (FOV). Through the carefully designed optical architecture and imaging lens parameters, the AR optical engine module provided in this application ensures that even within a wide field of view, the image can maintain a high degree of clarity and accuracy, bringing an immersive visual experience to the user.

[0233] For the AR optical engine module provided in this Embodiment 1, see Figure 5 , the MTF (Modulation Transfer Function) diagram shows good imaging performance, and the average MTF value of each field of view exceeds 0.47. At the Nyquist frequency of 167 lp / mm, this result far exceeds the standard required for AR display. This excellent MTF performance ensures the complete retention of detailed information during image transmission, making the imaging quality clear and sharp, perfectly meeting the high requirements of AR display.

[0234] For the AR optical engine module provided in Embodiment 1, refer to Figure 6 , the lateral chromatic aberration of RGB is only < 1.5 μm, which indicates that the achromatic ability of the imaging lens 3 is extremely strong.

[0235] Embodiment 2

[0236] Refer to Figure 1 and Figure 7 . The optical architecture of the AR optical engine module provided in Embodiment 2 is the same as that of Embodiment 1 above, and will not be described repeatedly here. The total optical length of the AR optical engine module provided in Embodiment 2 is 10.8 mm.

[0237] It should be noted that Figure 7 shows the structure of the imaging lens part in Embodiment 2.

[0238] The specific parameters of the AR optical engine module provided in Embodiment 2 are shown in Table 2 below, which includes the radius of curvature, thickness, glass material, and semi-aperture of the lens.

[0239] Table 2

[0240]

[0241] For the AR optical engine module provided in Embodiment 2, refer to Figure 8 . Its optical distortion diagram shows that its optical distortion rate is controlled within 10.1%, and this optical performance fully meets the extremely high requirements of the human eye for imaging quality at a large field of view (FOV).

[0242] For the AR optical engine module provided in Embodiment 2, refer to Figure 9 . The MTF (Modulation Transfer Function) diagram shows excellent imaging performance, and the average MTF value of each field of view exceeds 0.41. At the Nyquist frequency of 167 lp / mm, this result far exceeds the standard required for AR display.

[0243] For the AR optical engine module provided in Embodiment 2, refer to Figure 10 . The lateral chromatic aberration of RGB is only < 2.3 μm, and the achromatic ability of the imaging lens 3 meets the AR imaging requirements.

[0244] The specific implementation manners of the AR glasses, AR display system, and AR display method in the embodiments of the present application can refer to the respective embodiments of the above AR optical engine module. Therefore, they at least have all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0245] What was mainly described in the above embodiments is the differences between the respective embodiments. As long as the different optimization features between the respective embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, it will not be elaborated here.

[0246] Although some specific embodiments of the present application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An AR optical machine module, characterized in that: Comprising: A light source (1) for providing illumination light (100); An illumination waveguide (2) having an entrance pupil region (21) and an exit pupil region (22), the illumination light (100) being coupled into the entrance pupil region (21) and coupled out from the exit pupil region (22); An imaging lens (3) for geometrically magnifying the illumination light (100) coupled out from the exit pupil region (22); An LCOS panel (4) for phase modulating the illumination light (100) magnified by the imaging lens (3) and forming imaging light (300), the imaging light (300) then being projected by the imaging lens (3) onto the exit pupil region (22) and then exiting; A diaphragm (5) disposed on the path of the imaging light exiting the exit pupil region (22) for adjusting the exit pupil size; A polarization control component (6) including a polarization beam splitting film (61), the polarization beam splitting film (61) being located between the exit pupil region (22) and the diaphragm (5) for reflecting S-line polarized light and transmitting P-line polarized light; Wherein, the imaging lens (3) includes a first lens (31), a second lens (32), a third lens (33), a fourth lens (34), a fifth lens (35) and a sixth lens (36) sequentially arranged along the same optical axis; wherein, the first lens (31) is located on the side close to the illumination waveguide (2), the sixth lens (36) is located on the side close to the LCOS panel (4), and the imaging lens (3) satisfies the following relationship: -0.3<（ f 1+ f 2+ f 4） / （ f 3+ f 5+ f 6）<1.6； in, f 1 is the focal length of the first lens (31), f 2 is the focal length of the second lens (32), f 3 is the focal length of the third lens (33), f 4 is the focal length of the fourth lens (34), f 5 is the focal length of the fifth lens (35), f 6 is the focal length of the sixth lens (36).

2. The AR optical machine module according to claim 1, characterized in that: The image height of the LCOS panel (4) is D, the total optical length of the AR optical engine module is L, and the ratio D / L between the two satisfies: 0.6 < D / L < 0.

8.

3. The AR optical machine module according to claim 1, characterized in that: The polarization control component further includes a polarizer (62) disposed on the optical path between the light source (1) and the entrance pupil region (21) for analyzing the polarization of the illumination light (100) provided by the light source (1), and only allowing S-line polarized light to enter the interior of the illumination waveguide (2) through the entrance pupil region (21).

4. The AR optical machine module according to claim 1, characterized in that: The optical powers of the first lens (31), the second lens (32) and the fourth lens (34) are positive; The optical powers of the third lens (33), the fifth lens (35) and the sixth lens (36) are negative.

5. The AR optical machine module according to claim 1, characterized in that: The total focal length of the imaging lens (3) is f , and the focal length of each lens in the imaging lens (3) is equal to the total focal length of the imaging lens (3) f The following relationship is satisfied: f 1 / f ＞2.6； 0.9＜ f 2 / f ＜1.1； -0.95＜ f 3 / f ＜-0.45； 0.62＜ f 4 / f ＜0.69； -7.2＜ f 5 / f ＜-2； -1.7＜ f 6 / f ＜9.4。 6. The AR optical machine module according to claim 1, characterized in that: The total focal length of the imaging lens (3) is f , and the curvature of the two surfaces of each lens in the imaging lens (3) is equal to the total focal length of the imaging lens (3). f The following relationship is satisfied: The sum of the two surface curvatures K1 and K2 of the first lens (31) and the total focal length of the imaging lens (3) f The ratio is -0.1<(K1+K2) / f <0.1; The sum of the two surface curvatures K3 and K4 of the second lens (32) and the total focal length of the imaging lens (3) f The ratio is -0.1<(K3+K4) / f <0; The sum of the two surface curvatures K5 and K6 of the third lens (33) and the total focal length of the imaging lens (3) f The ratio is -0.1<(K5+K6) / f <-0.05; The sum of the two surface curvatures K7 and K8 of the fourth lens (34) and the total focal length of the imaging lens (3) f The ratio is -0.22<(K7+K8) / f <0; The two surface curvatures K9 and K 10 The sum of the total focal length of the imaging lens (3) f The ratio is 0<(K9+K 10 ) / f <0.05; The two surface curvatures K of the sixth lens (36) are 11 and K 12 The sum of the total focal length of the imaging lens (3) f The ratio is 0.2<(K 11 +K 12 ) / f<0.

28.

7. The AR optical machine module according to any one of claims 1 to 6, characterized in that: All of the first lens (31) to the sixth lens (36) in the imaging lens (3) are aspherical lenses.

8. The AR optical machine module according to claim 1, characterized in that: The diaphragm (5) is a front diaphragm, the exit pupil distance H of the AR optical engine module is 0 < H < 3 mm, and the size pupil of the diaphragm (5) is 2 mm < pupil < 5 mm.

9. The AR optical machine module according to claim 2, characterized in that: The image height D of the LCOS panel (4) ≤ 8 mm, and the pixel size of the LCOS panel (4) satisfies: pixel ≥ 2.5 μm.

10. The AR optical machine module according to claim 9, characterized in that: The total optical length L of the AR optical engine module ≤ 10.8 mm, and the FOV of the AR optical engine module ≥ 70°.

11. The AR optical machine module according to claim 1, characterized in that: The light source (1) includes an LED light source of natural light or a laser light source of polarized light.

12. An AR glasses, characterized in that: Comprising: A housing; The AR optical engine module according to any one of claims 1-11; And An optical waveguide device (01) comprises a light coupling-in element (011) and a light coupling-out element (012), wherein the light coupling-in element (011) is located on the light output path of the aperture (5).

13. An AR display system, characterized in that: Including the AR glasses described in claim 12.

14. An AR display method, characterized in that: Imaging is performed using the AR optical machine module according to any one of claims 1 to 11, wherein the display method comprises: The light source (1) provides an illumination light (100), wherein the illumination light (100) is S-polarized light; The illumination light (100) is coupled into the illumination waveguide (2) from an entrance pupil region (21), and is coupled out from an exit pupil region (22) of the illumination waveguide (2) to an imaging lens (3); The illumination light (100) is geometrically magnified by the imaging lens (3) and then projected onto the LCOS panel (4); After the illumination light (100) is emitted from the LCOS panel (4), it is phase modulated into P-line polarized light and forms imaging light (300); The imaging light (300) is magnified by the imaging lens (3) and then emitted from the exit pupil area (22) to the aperture (5); The imaging light (300) is emitted through the aperture (5) to an external optical waveguide device (01) to achieve projection imaging.

Images