AR optical system and AR optical display device

Abstract

The embodiment of the utility model provides an AR optical system and AR optical display equipment. Wherein the optical system comprises a turning mirror, a polarization reflection element, a phase retarder, a light splitting element, a liquid crystal film and a lens group which are arranged along the same optical axis; wherein the phase delayer is located between the light splitting element and the polarization reflection element; the lens group comprises a lens, and the lens is located between the phase retarder and the light splitting element; the liquid crystal film is located on the side, away from the lens, of the light splitting element. The optical system further comprises a screen, and the turning mirror is further located on a light emitting path of the screen.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical technology, and more specifically, relate to an AR optical system and an optical display device. Background Art

[0002] With the rapid development of augmented reality (AR) technology, users are increasingly demanding on the visual experience of AR devices. However, a problem that has long plagued the industry is the color streak phenomenon. Color streak is caused by the presence of components with high stress between the AR optical system and the polarized light source, such as the polarized reflective film, when the user wears an AR optical system containing a polarized reflective film and views a polarized light source, resulting in colored stripes in the field of vision. This phenomenon seriously affects the clarity of the image and greatly reduces the overall visual experience of the user.

[0003] To solve this problem, existing technical approaches mainly include optimizing the stress distribution of internal components of AR optical systems and selecting low-stress materials. However, these methods are often limited by the performance of the materials themselves and the complexity of the optical system design, making it difficult to achieve fundamental breakthroughs, so that the color stripe problem has not been effectively solved. Therefore, finding a simple and efficient method to eliminate or reduce the color stripe phenomenon has become an urgent problem to be solved in the field of AR technology. Utility Model Content

[0004] The purpose of this application is to provide a new technical solution for an AR optical system and an AR optical display device.

[0005] In a first aspect, the present application provides an AR optical system, the AR optical system comprising a deflection mirror, a polarization reflection element, a phase retarder, a beam splitter, a liquid crystal film and a lens group arranged along the same optical axis, and the phase retarder is located between the beam splitter and the polarization reflection element;

[0006] The lens group includes at least one lens, and the lens is located on any side of any element of the beam splitter and the phase retarder;

[0007] The liquid crystal film is located on the ambient light incident side of the lens;

[0008] The optical system also includes a screen, and the deflection mirror is also located on the light exit path of the screen.

[0009] Optionally, the liquid crystal film is arranged on a surface of the lens away from the turning mirror.

[0010] Optionally, the liquid crystal film is a liquid crystal film that can adjust the polarization of liquid crystal molecules at high frequency, or a liquid crystal film that can change the polarization state of incident light.

[0011] Optionally, the frequency at which the liquid crystal film adjusts the polarization state of light is ≥ the refresh frequency of the screen.

[0012] Optionally, the axial rotation direction of the liquid crystal of the liquid crystal film includes rotation in the same direction or alternating rotation in two different directions.

[0013] Optionally, the turning mirror is arranged to be inclined relative to any one of the screen and the lens;

[0014] The polarized reflection element is arranged on a surface of the turning mirror close to the lens.

[0015] Optionally, the phase retarder is arranged on a surface of the lens close to the turning mirror, and the beam splitter is arranged on a surface of the lens away from the turning mirror.

[0016] Optionally, the liquid crystal film and the beam splitter element are stacked to form a composite film material, and are disposed on a surface of the lens away from the deflection mirror, and the beam splitter element is located between the liquid crystal film and the lens.

[0017] Optionally, a polarizing element is arranged on the light emitting surface of the screen.

[0018] In a second aspect, the present application provides an AR optical display device, which includes a housing and the AR optical system as described in the first aspect.

[0019] The beneficial effects of this application are:

[0020] The embodiment of the present application provides an AR optical system. First, by introducing a liquid crystal film on the ambient light incident side of the AR optical system, the light incident to the front end of the AR optical system (i.e., the ambient light incident end) can be converted into disordered non-polarized light. This design effectively solves the color streak problem caused by components with large stress (such as polarized reflective film) between the AR optical system and the polarized light source, which not only improves the optical performance of the AR optical system, but also significantly improves the visual comfort of the user; secondly, the high-frequency adjustment characteristics of the liquid crystal film ensure the real-time and effectiveness of the light conversion effect, which means that no matter how the ambient light changes, the liquid crystal film can respond quickly and make corresponding adjustments, so as to always maintain the best display effect. This feature is crucial to improving the user experience of AR optical display devices.

[0021] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0023] Figure 1 A schematic diagram of the structure of an AR optical system provided in an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the liquid crystal axis and the polarization reflection axis transmission axis provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 1. Aperture; 2. Turning mirror; 3. Polarized reflection element; 4. Phase retarder; 5. Lens; 6. Liquid crystal film; 7. Beam splitter; 8. Screen; 9. Polarization element; 10. Light. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0029] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0030] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0031] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] The AR optical system and the AR optical display device provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0033] According to one aspect of the embodiments of the present application, an AR optical system is provided. Figure 1The AR optical system includes a deflection mirror 2, a polarization reflection element 3, a phase retarder 4, a beam splitter 7, a liquid crystal film 6 and a lens group arranged along the same optical axis, and the phase retarder 4 is located between the beam splitter 7 and the polarization reflection element 3; the lens group includes at least one lens 5, and the lens 5 is located on any side of any element of the beam splitter 7 and the phase retarder 4; the liquid crystal film 6 is located on the ambient light incident side of the lens 5; the optical system also includes a screen 8, and the deflection mirror 2 is also located on the light exit path of the screen 8.

[0034] The AR optical system provided in the embodiment of the present application not only includes the lens 5 and the turning mirror 2, but also incorporates a series of optical film materials such as the polarized reflective element 3, the phase retarder 4, the beam splitter 7 and the liquid crystal film 6. These optical devices are carefully arranged and matched to form an efficient augmented reality (AR) system. The AR optical system not only embodies the excellent integration of optical technology, but also demonstrates the infinite possibilities of AR technology while ensuring the user's visual experience.

[0035] In the AR optical system provided in the embodiment of the present application, the deflection mirror 2 is located on one side of the lens 5 and is also located on the light exit path of the screen 8 .

[0036] Specifically, see Figure 1 The screen 8 is responsible for displaying the image, and the light 10 (such as linear polarized light) emitted by it is reflected by the polarization reflection element 3 on one side of the deflection mirror 2, and then incident on the phase retarder 4, and finally refracted and amplified by the lens 5. In this process, the beam splitter 7 set on one side of the lens 5 can reflect part of the light back to the user's eyes to form a virtual image on the screen 8.

[0037] Please continue to see Figure 1 For the ambient light from the outside, it first passes through the liquid crystal film 6, which is used to adjust the polarization state of the light; then, these lights pass through the splitter element 7 and the lens 5 in turn, and then are modulated by the phase retarder 4, and finally pass through the polarized reflection element 3 and the turning mirror 2, and merge with the virtual image on the screen 8 into the aperture 1, which can bring an immersive augmented reality visual experience to the user.

[0038] In the AR optical system provided in the embodiment of the present application, the screen 8 is used to display virtual images, and these images are finally presented in the user's field of view through the deflection mirror 2 and a series of optical elements.

[0039] In the AR optical system provided in the embodiment of the present application, the light splitting element 7 is designed to be located on either side of the lens 5. For example, see Figure 1The beam splitter element 7 is arranged on a side of the lens 5 away from the turning mirror 2 .

[0040] The light splitting element 7 is, for example, a semi-transparent and semi-reflective film, which allows a portion of light to be transmitted and another portion of light to be reflected. It should be noted that the reflectivity and transmittance of the light splitting element 7 can be flexibly adjusted according to specific needs, and this is not limited in the embodiments of the present application.

[0041] In the optical system provided in the embodiment of the present application, the phase retarder 4 can be used to change the polarization state of light. For example, it is used to convert linearly polarized light into circularly polarized light, or to convert circularly polarized light into linearly polarized light. The phase retarder 4 here is, for example, a quarter wave plate. Of course, the phase retarder 4 can also be set to other phase retarder film materials as needed.

[0042] For example, see Figure 1 The phase retarder 4 is located on a side of the lens 5 close to the turning mirror 2 .

[0043] In the optical system provided in the embodiment of the present application, the polarized reflective element 3 is a polarized reflector that reflects horizontal linear polarized light and transmits vertical linear polarized light, or a polarized reflector that reflects linear polarized light at any other specific angle and transmits linear polarized light in a direction perpendicular to the angle. In other words, the polarized reflective element 3 is used to guide and control the polarization direction of light to achieve reflection or transmission of a specific light path. The polarized reflective element 3 is very critical in the AR optical system because it allows light from the screen 8 to be reflected to the user's eyes or aperture 1, while allowing ambient light to be transmitted to the user's eyes or aperture 1, achieving an augmented reality effect.

[0044] For example, see Figure 1 The polarized reflection element 3 is arranged on a side of the turning mirror 2 close to the lens 5 .

[0045] In the AR optical system provided in the embodiment of the present application, the phase retarder 4 is used together with the polarization reflection element 3 to adjust the polarization direction of the light to ensure that the light can be correctly reflected or transmitted.

[0046] In the optical system provided in the embodiment of the present application, the liquid crystal film 6 is located on the ambient light incident side of the lens 5, and its main function is to convert the ambient light incident on the front end of the AR optical system into disordered non-polarized light. Since the polarized reflective element 3 may interfere with the polarized light source, resulting in the appearance of color stripes, the liquid crystal film 6 effectively reduces such interference by eliminating the polarization of the ambient light, thereby improving the user experience.

[0047] In the optical system provided in the embodiment of the present application, the lens group may include only one lens, such as Figure 1The lens 5 shown in FIG. The lens 5, together with the polarized reflection element 3, the phase retarder 4 and the beam splitter 7, can form a folded optical path for focusing and imaging.

[0048] Of course, the lens group may also include two or more lenses. For example, a certain number of lenses may be added between the deflection mirror 2 and the lens 5, or a certain number of lenses may be added between the deflection mirror 2 and the screen 8 to improve the imaging quality.

[0049] The AR optical system provided in the embodiment of the present application realizes a good fusion function of virtual images and ambient light through a cleverly designed optical element layout. The use of the liquid crystal film 6 effectively reduces the color fringes caused by polarization interference and improves the user's visual experience. At the same time, the coordinated use of optical elements such as the turning mirror 2 and the polarized reflective element 3 makes the entire AR optical system more compact and efficient, and is suitable for use in head-mounted display devices or other small optical display devices.

[0050] The AR optical system provided in the embodiment of the present application ensures the effective transmission and refraction and reflection of light by arranging key optical elements such as a deflection mirror 2, a polarized reflection element 3, a phase retarder 4, and a beam splitter 7 along the same optical axis, thereby reducing energy loss in the optical path and improving the optical efficiency of the entire AR optical system. The liquid crystal film 6 is located on the ambient light incident side of the lens 5, which can effectively control the interference of ambient light on the AR image. The liquid crystal film 6 can adjust its transmission or reflection state as needed, thereby filtering or enhancing the ambient light and improving the contrast of the AR image. The use of the deflection mirror 2 not only changes the direction of the light path, but also helps to expand the field of view. Through clever optical design, the AR optical system can provide a wider field of view, allowing users to integrate into the virtual environment more naturally.

[0051] In some examples of this application, see Figure 1 The liquid crystal film 6 is arranged on the surface of the lens 5 away from the turning mirror 2 .

[0052] In the examples provided in this application, see Figure 1 , the liquid crystal film 6 is arranged on the surface of the lens 5 away from the deflection mirror 2, that is, the liquid crystal film 6 is located on the side of the lens 5 facing the external environment. This design can bring the following technical effects:

[0053] (1) Enhanced control of ambient light: The liquid crystal film 6 is placed on the side of the lens 5 away from the turning mirror 2, so that it can directly face the ambient light of the outside world. This enables the liquid crystal film 6 to more effectively control and manage the ambient light entering the AR optical system. By adjusting the transmission or reflection characteristics of the liquid crystal film 6, it is possible to optimize the fusion effect between ambient light and virtual images, reduce the interference of ambient light on virtual images, and improve the overall visual experience.

[0054] (2) The position selection of the liquid crystal film 6 enables the user to interact with the ambient light more directly. For example, when the user wears the AR optical system and faces an environment with different brightness, the liquid crystal film 6 can also adjust its transmittance to adapt to the change of ambient light, ensuring that the virtual image remains clear and comfortable under different lighting conditions.

[0055] (3) The liquid crystal film 6 is arranged outside the lens 5, which can reduce the influence of other components in the internal optical path on the performance of the liquid crystal film 6. This can ensure that the function of the liquid crystal film 6 is fully exerted and improve the overall performance of the AR optical system.

[0056] (4) The liquid crystal film 6 is arranged on the lens 5, which can also simplify the assembly process of the AR optical system without introducing additional supporting elements, and multiple components can be assembled at the same time.

[0057] In the process of seeking to enhance the AR visual experience, special attention is paid to solving a common problem: when a user wears an AR optical system containing a polarized reflective film and looks at a polarized light source, unpleasant color stripes are easily caused due to the influence of components with high stress inside the optical system. In order to improve this problem, the present application proposes a solution - adding a liquid crystal film 6 to the ambient light incident end of the AR optical system. The introduction of this liquid crystal film 6 cleverly solves the color stripe problem. Specifically, the ambient light incident on the AR optical system is converted into disordered non-polarized light, thereby effectively reducing the color stripe phenomenon caused by polarization interference.

[0058] In some examples of the present application, the liquid crystal film 6 is a liquid crystal film that can adjust the polarization of liquid crystal molecules at high frequency, or a liquid crystal film that can change the polarization state of incident light.

[0059] When the liquid crystal film 6 uses a liquid crystal film that adjusts the polarization of liquid crystal molecules at high frequency, it can achieve rapid and dynamic adjustment of the polarization state of the incident light. This liquid crystal film material can quickly change its optical properties according to actual needs, thereby achieving precise control of polarized light. This dynamic polarization control function is particularly important in augmented reality (AR) systems, which can ensure seamless integration of virtual images and ambient light and improve the overall visual experience.

[0060] When a user wears an AR optical system containing a polarized reflective film (i.e., the polarized reflective element 3 mentioned in this application) and looks at a polarized light source, color fringes are easily caused due to the influence of components with greater stress inside the AR optical system. The use of a liquid crystal film that can change the polarization state of the incident light can effectively reduce the appearance of such color fringes. Here, the liquid crystal film 6 can adjust the polarization direction of the light so that the reflected light matches the polarization state of the incident light, thereby avoiding the color fringes caused by polarization interference.

[0061] In the AR optical system provided in the embodiment of the present application, see Figure 1 After the liquid crystal film 6 adjusts the polarization state of the incident ambient light, it can optimize the propagation path of the light and reduce the scattering and loss of light in the AR optical system. This helps to improve the clarity and contrast of the image, allowing the user to see the virtual image more clearly and enhance the overall visual experience.

[0062] In addition, since the liquid crystal film 6 can dynamically adjust its optical properties, it can adapt to the use requirements under different lighting conditions. Whether in a bright environment or in a dim environment, the liquid crystal film 6 can ensure a good integration of the virtual image and the ambient light, providing a stable and comfortable visual experience.

[0063] In some examples of the present application, the frequency at which the liquid crystal film 6 adjusts the polarization state of light is ≥ the refresh frequency of the screen 8 .

[0064] Regarding the liquid crystal film 6 adjusting the polarization state: the liquid crystal film 6 adjusts the polarization state of light by changing the arrangement of liquid crystal molecules under the action of the electric field. In other words, when the electric field changes, the liquid crystal molecules will respond quickly and change their arrangement, thereby changing the polarization direction of the light.

[0065] According to the example of the present application, the frequency of the liquid crystal film 6 adjusting the polarization state of light is greater than or equal to the refresh frequency of the screen 8 to ensure that within the refresh frequency of the screen 8, the liquid crystal film 6 can timely and accurately adjust the polarization state of light, thereby displaying the correct image.

[0066] If the frequency of adjusting the polarization state of the liquid crystal film 6 is lower than the refresh frequency of the screen 8, the liquid crystal film 6 may not complete the polarization state adjustment of the current pixel before the next refresh of the screen 8, which may cause image display errors or delays. Maintaining or exceeding the refresh frequency of the screen 8 can ensure that the liquid crystal film 6 can complete the polarization state adjustment of all pixels within each refresh frequency, thereby achieving smooth and accurate image display.

[0067] According to the example provided in the present application, the frequency of adjusting the polarization state of the liquid crystal film 6 matches or is longer than the refresh frequency of the screen 8, which means that the liquid crystal film 6 can adjust the polarization state of light in real time following the content update of the screen 8. This ensures that the polarization state of the virtual image and the real ambient light can change synchronously, thereby avoiding image distortion or color shift caused by time difference.

[0068] Due to the synchronous or nearly synchronous operation of the liquid crystal film 6 and the screen 8, the user can experience a smoother and more natural visual transition when using the AR optical system. This seamless transition reduces the user's visual fatigue caused by image flickering or jumping, and improves the comfort and durability of use.

[0069] Furthermore, by ensuring that the modulation frequency of the liquid crystal film 6 matches the refresh frequency of the screen 8, the AR optical system can reduce unnecessary energy consumption and time waste.

[0070] In some examples of this application, see Figure 2 The axial rotation direction of the liquid crystal of the liquid crystal film 6 includes rotating in the same direction or rotating alternately in two different directions.

[0071] The liquid crystal axial rotation direction of the liquid crystal film 6 has two possible configurations: one is that the liquid crystal molecules rotate continuously in the same direction (either clockwise or counterclockwise), and the other is that the liquid crystal molecules rotate alternately in two different directions (such as first clockwise and then counterclockwise). These two configurations each bring different technical effects.

[0072] Regarding the liquid crystal molecules rotating continuously in the same direction. When the liquid crystal molecules rotate continuously in the same direction, the liquid crystal film 6 can maintain a stable polarization state continuously, ensuring that light has a consistent polarization effect when passing through. This helps to enhance the stability of the image and reduce visual interference caused by changes in the polarization state. In addition, for system control, keeping the liquid crystal molecules rotating in the same direction can simplify the control logic, reduce the amount of calculation and response time, thereby improving the overall performance of the system.

[0073] About the liquid crystal molecules rotating alternately in two different directions. The two different directions here can be, for example, rotating in a clockwise direction and then rotating in a counterclockwise direction. Specifically, when the liquid crystal molecules rotate alternately in two different directions, the liquid crystal film 6 can dynamically change the polarization state of the light as needed. This dynamic adjustment capability is crucial for coping with complex lighting environments and display requirements, and can achieve more sophisticated polarization control. The alternatingly rotating liquid crystal molecules enable the liquid crystal film 6 to adapt to different lighting conditions and display content, and optimize the visual effect by adjusting the polarization state. This helps to improve the adaptability and flexibility of the AR optical system and meet the needs of different users and application scenarios. In addition, by alternately rotating the liquid crystal molecules, the liquid crystal film 6 can produce a more natural visual transition effect and reduce visual fatigue caused by watching the same polarization state for a long time. This is of great significance for improving the user experience.

[0074] In general, different configurations of the liquid crystal axis rotation direction of the liquid crystal film 6 bring their own unique technical effects. The liquid crystal molecules that continuously rotate in the same direction provide the advantages of stability and simplified control logic, while the liquid crystal molecules that rotate alternately in two different directions enhance the dynamic adjustment ability and adaptability, while helping to reduce visual fatigue. These two configurations can be selected and optimized according to specific application scenarios and needs to achieve the best visual effect and user experience.

[0075] In some examples of this application, see Figure 1 The turning mirror 2 is tilted relative to the screen 8 and the lens 5 ; the polarized reflection element 3 is disposed on the surface of the turning mirror 2 close to the lens 5 .

[0076] See also Figure 1 The deflection mirror 2 is tilted relative to either the screen 8 or the lens 5. This design allows, for example, the light 10 emitted from the screen 8 to change its propagation direction when passing through the deflection mirror 2, thereby redirecting the light path. The selection of the tilt angle of the deflection mirror 2 will directly affect the degree of change in the light path.

[0077] See also Figure 1 , the polarized reflective element 3 is disposed on the surface of the deflection mirror 2 close to the lens 5. The polarized reflective element 3 can reflect light of a specific polarization direction while allowing light of other polarization directions to pass through. In this arrangement, the polarized reflective element 3 may be used to control the polarization state of light to ensure that only light of a specific polarization direction is reflected to the lens 5.

[0078] By the tilt setting of the deflection mirror 2 and the precise layout of the polarized reflective element 3, the AR optical system can realize a complex optical path design in a limited space, thereby improving the space utilization. The tilt angle of the deflection mirror 2 and the position of the polarized reflective element 3 can accurately control the propagation path of the light 10, ensuring that the light 10 can propagate along a predetermined path, reducing the loss and scattering of the light. By precisely controlling the polarization state and propagation path of the light 10, the final imaging display effect can be optimized and the clarity of the image can be improved.

[0079] In addition, optionally, the polarized reflective element 3 may also be arranged on a surface of the deflecting mirror 2 away from the lens 5 .

[0080] In some examples of this application, see Figure 1 The phase retarder 4 is arranged on the surface of the lens 5 close to the turning mirror 2, and the beam splitter 7 is arranged on the surface of the lens 5 away from the turning mirror 2.

[0081] In the embodiment of the present application, the phase retarder 4 is, for example, a quarter wave plate, which is used to control the polarization state of the light. When the light 10 emitted by the screen 8 passes through the lens 5, if its polarization state does not meet the requirements of the AR optical system, the phase retarder 4 can adjust the polarization direction or phase difference of the light 10 to ensure that the light continues to propagate in the correct polarization state.

[0082] In the embodiment of the present application, the lens 5 also carries multiple functions. The phase retarder 4 is arranged on the surface of the lens 5 close to the turning mirror 2 to adjust the polarization state of the light; and the light splitting element 7 (semi-transparent and semi-reflective film) is arranged on the surface of the lens 5 away from the turning mirror 2. This design makes full use of the surface area of ​​the lens 5 and improves the integration and efficiency of the system. In particular, in the assembly of the AR optical system, multiple optical elements can be installed at one time.

[0083] It should be noted that, in the present application, the polarized reflection element 3 can be located on any surface of the turning mirror 2. Combined with the film-sticking method in this example of the present application, it can ensure that the phase delay device 4 is located between the beam splitting element 7 and the polarized reflection element 3 to ensure that the light path is folded.

[0084] In some examples of this application, see Figure 1 The liquid crystal film 6 and the beam splitter element 7 are stacked to form a composite film material, and are disposed on a surface of the lens 5 away from the deflection mirror 2 , and the beam splitter element 7 is located between the liquid crystal film 6 and the lens 5 .

[0085] The liquid crystal film 6 is a thin film that can adjust the polarization state of light. By applying an electric field or a magnetic field, the liquid crystal molecules will be rearranged, thereby changing the polarization direction of the light.

[0086] The liquid crystal film 6 and the light splitting element 7 are stacked to form a composite film material, which improves the integration of the entire AR optical system. This design makes the optical system more compact. In this example of the present application, the light splitting element 7 is located between the liquid crystal film 6 and the lens 5, that is, the liquid crystal film 6 is located on the outermost side of the lens 5.

[0087] In addition, due to the close fit between the liquid crystal film 6 and the light splitting element 7, the entry of dust and impurities is reduced, further enhancing the stability of the AR optical system.

[0088] In some examples of this application, see Figure 1 A polarizing element 9 is arranged on the light-emitting surface of the screen 8 .

[0089] The polarizing element 9 is, for example, a polarizing film, which can be combined with the light-emitting surface of the screen 8 by pasting.

[0090] The polarization element 9 can be used to control the polarization state of the light 10 emitted by the screen 8. When the light 10 passes through the polarization element 9, only the light consistent with the transmission direction of the polarization element 9 can pass through, while the light perpendicular to the transmission direction is absorbed or reflected. By adjusting the transmission direction of the polarization element 9, the polarization state of the light emitted by the screen 8 can be controlled to meet specific display requirements.

[0091] The setting of the polarizing element 9 can significantly improve the final imaging display effect. First, by controlling the polarization state of the light 10 emitted by the screen 8, the scattering and reflection of the light 10 during the transmission process can be reduced, thereby improving the clarity of the image. Secondly, the polarizing element 9 can also filter out unnecessary stray light, reduce glare and ghosting phenomena, and improve viewing comfort.

[0092] According to this example of the present application, the polarizing element 9 is directly arranged on the light-emitting surface of the screen 8, which simplifies the structure of the system. This design reduces the complexity and cost of the system and improves production efficiency. In addition, the close combination of the polarizing element 9 and the screen 8 reduces the entry of dust and impurities, and can also provide a certain degree of protection for the screen 8.

[0093] According to another embodiment of the present application, an AR optical display device is provided, which includes: a housing and the AR optical system as described above.

[0094] The AR optical display device provided in the embodiments of the present application is, for example, AR glasses or an AR helmet.

[0095] The specific implementation of the optical display device of the embodiment of the present application can refer to the above-mentioned embodiments of the optical system, so it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0096] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0097] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may 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 system, characterized in that: The invention comprises a deflection mirror (2), a polarization reflection element (3), a phase retarder (4), a beam splitter (7), a liquid crystal film (6), and a lens group arranged along the same optical axis, wherein the phase retarder (4) is located between the beam splitter (7) and the polarization reflection element (3); The lens group includes at least one lens (5), and the lens (5) is located on either side of any one of the beam splitter (7) and the phase retarder (4); The liquid crystal film (6) is located on the ambient light incident side of the lens (5); The optical system further comprises a screen (8), and the deflection mirror (2) is also located on the light exit path of the screen (8).

2. The AR optical system according to claim 1, wherein: The liquid crystal film (6) is arranged on a surface of the lens (5) away from the turning mirror (2).

3. The AR optical system according to claim 1, wherein: The liquid crystal film (6) is a liquid crystal film that can adjust the polarization of liquid crystal molecules at high frequency, or a liquid crystal film that can change the polarization state of incident light.

4. The AR optical system according to claim 1, wherein: The frequency at which the liquid crystal film (6) adjusts the polarization state of light is greater than or equal to the refresh frequency of the screen (8).

5. The AR optical system according to claim 1, wherein: The axial rotation direction of the liquid crystal of the liquid crystal film (6) includes rotation in the same direction or alternating rotation in two different directions.

6. The AR optical system according to claim 1, wherein: The deflection mirror (2) is arranged to be tilted relative to either the screen (8) or the lens (5); The polarized reflection element (3) is arranged on a surface of the turning mirror (2) close to the lens (5).

7. The AR optical system according to claim 1 or 6, wherein: The phase delay device (4) is arranged on the surface of the lens (5) close to the deflection mirror (2), and the light splitting element (7) is arranged on the surface of the lens (5) away from the deflection mirror (2).

8. The AR optical system according to claim 7, wherein: The liquid crystal film (6) and the light splitting element (7) are stacked to form a composite film material, and are arranged on a surface of the lens (5) away from the deflection mirror (2), and the light splitting element (7) is located between the liquid crystal film (6) and the lens (5).

9. The AR optical system according to claim 1, wherein: A polarizing element (9) is provided on the light-emitting surface of the screen (8).

10. An AR optical display device, characterized in that: include: shell; The AR optical system according to any one of claims 1 to 9.

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