LCOS optical system and AR device

Abstract

The utility model provides an LCOS optical system and AR equipment, and relates to the technical field of AR equipment. The LCOS optical system comprises an illumination assembly and an imaging assembly. The illumination assembly comprises a light source, and a collimating element, a dodging element and a reflector which are sequentially arranged on the light emitting side of the light source; the imaging assembly comprises a beam splitter prism, an LCOS device and a projection lens, and the beam splitter prism is located on the light emitting side of the reflector; the light source is an RGB three-color light source; a light beam emitted by the light source enters the beam splitter prism after being collimated by the collimating element, dodging by the dodging element and reflected by the reflector in sequence, the light beam passing through the beam splitter prism enters the LCOS device, the LCOS device modulates the light beam into image light with image information, and the image light is transmitted to the projection lens after passing through the beam splitter prism. And the projection lens is used for projecting and imaging the modulated image light. According to the LCOS optical system, the illumination space can be reduced, so that the overall size of the LCOS optical system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of AR devices, and in particular, to an LCOS optical system and an AR device. Background Art

[0002] Augmented Reality (AR) technology is a new technology that "seamlessly" integrates real-world information and virtual-world information. It is a technology that simulates and superimposes entity information that is difficult to experience within a certain time and space range in the real world through scientific technologies such as computers, so that people can obtain a sensory experience beyond reality. Due to the characteristic of the augmented reality technology of superimposing virtual objects or images in a real environment, it has shown great application potential in many fields.

[0003] The traditional AR device solution consists of a projection optical machine and a waveguide. Considering the low light utilization efficiency of the waveguide, Liquid Crystal On Silicon (LCOS) display technology has gradually become the preferred solution. The traditional LCOS lighting solution uses two LED lights, a color combiner, and a relay lens. This solution has many optical components, is relatively complicated in design and assembly, and has a large volume, which is contrary to the development trend requirements of the AR device towards miniaturization and lightweight. Therefore, it is necessary to provide a new LCOS optical system for AR devices to further reduce the volume of the AR device. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an LCOS optical system and an AR device, which can reduce the lighting space, thereby reducing the overall volume of the LCOS optical system.

[0005] The embodiments of the utility model are implemented as follows:

[0006] On one aspect of the present utility model, there is provided an LCOS optical system, which includes an illumination assembly and an imaging assembly disposed on the light-emitting side of the illumination assembly; the illumination assembly includes a light source, and a collimating element, a light homogenizing element, and a reflecting mirror successively disposed on the light-emitting side of the light source; the imaging assembly includes a beam splitting prism, an LCOS device, and a projection lens, and the beam splitting prism is located on the light-emitting side of the reflecting mirror; the light source is an RGB three-color light source; the light beam emitted by the light source is successively collimated by the collimating element, homogenized by the light homogenizing element, and reflected by the reflecting mirror and then incident on the beam splitting prism, and the light beam after passing through the beam splitting prism is incident on the LCOS device, and the LCOS device modulates the light beam into image light with image information and transmits it to the projection lens through the beam splitting prism, and the projection lens is used to project and image the modulated image light. This LCOS optical system can reduce the illumination space, thereby reducing the overall volume of the LCOS optical system.

[0007] Optionally, the illumination assembly further includes a first relay mirror and a second relay mirror, wherein the first relay mirror is located between the light-emitting side of the light homogenizing element and the light-incident side of the reflecting mirror, and the second relay mirror is located between the light-emitting side of the reflecting mirror and the light-incident side of the beam splitting prism.

[0008] Optionally, the light source, the collimating element, the light homogenizing element, the first relay mirror, and the reflecting mirror are arranged along a first direction; the arrangement direction of the beam splitting prism and the projection lens is parallel to the first direction; the reflecting mirror, the second relay mirror, and the beam splitting prism are arranged along a second direction, and the first direction is perpendicular to the second direction.

[0009] Optionally, the LCOS device and the projection lens are respectively located on opposite sides of the beam splitting prism.

[0010] Optionally, the LCOS device and the second relay mirror are respectively located on opposite sides of the beam splitting prism.

[0011] Optionally, a first absorption-type polarizing element is provided between the second relay mirror and the beam splitting prism, a first phase retardation wave plate is provided between the LCOS device and the beam splitting prism, and a second absorption-type polarizing element and a second phase retardation wave plate are provided between the beam splitting prism and the projection lens.

[0012] Optionally, the LCOS device, the first phase retardation wave plate, the beam splitting prism, the first absorption-type polarizing element, the second absorption-type polarizing element, and the second phase retardation wave plate are glued into an integral structure.

[0013] Optionally, the collimating element includes a first collimating mirror and a second collimating mirror disposed between the first collimating mirror and the light homogenizing element; or, the collimating element is a reflector cup.

[0014] Optionally, the light homogenizing element is a fly-eye lens or a diffuser.

[0015] On the other hand, the present utility model provides an AR device, which includes the above-mentioned LCOS optical system.

[0016] The beneficial effects of the present utility model include:

[0017] The LCOS optical system provided in this application includes an illumination component and an imaging component disposed on the light-emitting side of the illumination component; the illumination component includes a light source, and a collimating element, a light homogenizing element, and a reflecting mirror sequentially disposed on the light-emitting side of the light source; the imaging component includes a beam splitting prism, an LCOS device, and a projection lens, and the beam splitting prism is located on the light-emitting side of the reflecting mirror; the light source is an RGB three-color light source; the light beam emitted by the light source is sequentially collimated by the collimating element, homogenized by the light homogenizing element, and reflected by the reflecting mirror and then incident on the beam splitting prism, and the light beam after passing through the beam splitting prism is incident on the LCOS device. The LCOS device modulates the light beam into an image light with image information and transmits it to the projection lens through the beam splitting prism, and the projection lens is used to project the modulated image light to form an image. Since the illumination component of the LCOS optical system of this application uses an RGB three-color light source, compared with the traditional solution, the second collimation module and the color combining mirror part can be removed, greatly reducing the illumination space, making the overall size of the illumination component comparable to that of the imaging component, which is conducive to the illumination component and the imaging component being stacked parallel to each other up and down, being able to make full use of space, and thus reducing the overall volume of the LCOS optical system. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 It is one of the structural schematic diagrams of the LCOS optical system provided in the embodiments of the present utility model;

[0020] Figure 2 It is the structural schematic diagram of the light source provided in the embodiments of the present utility model;

[0021] Figure 3 It is the second of the structural schematic diagrams of the LCOS optical system provided in the embodiments of the present utility model;

[0022] Figure 4 It is the third of the structural schematic diagrams of the LCOS optical system provided in the embodiments of the present utility model.

[0023] Icons: 10 - Lighting component; 11 - Light source; 12 - Collimating element; 121 - First collimating mirror; 122 - Second collimating mirror; 123 - Reflector cup; 13 - Light homogenizing element; 14 - First relay mirror; 15 - Reflecting mirror; 16 - Second relay mirror; 20 - Imaging component; 21 - Beam splitting prism; 22 - LCOS device; 23 - Projection lens; 231 - First lens; 232 - Second lens; 233 - Third lens; 234 - Fourth lens; 235 - Fifth lens; 236 - Sixth lens; 24 - First absorption type polarizing element; 25 - First phase retardation wave plate; 26 - Second absorption type polarizing element; 27 - Second phase retardation wave plate; a - First direction; b - Second direction. Detailed implementation manners

[0024] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

[0026] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0028] In addition, terms such as "horizontal" and "vertical" do not require the components to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0029] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Please refer to Figure 1 and Figure 2 , this embodiment provides an LCOS optical system. The LCOS optical system includes an illumination component 10 and an imaging component 20 arranged on the light-emitting side of the illumination component 10; the illumination component 10 includes a light source 11, and a collimating element 12, a light homogenizing element 13, and a reflecting mirror 15 arranged in sequence on the light-emitting side of the light source 11; the imaging component 20 includes a beam splitting prism 21, an LCOS device 22, and a projection lens 23. The beam splitting prism 21 is located on the light-emitting side of the reflecting mirror 15; the light source 11 is an RGB three-color light source 11; the light beam emitted by the light source 11 is collimated by the collimating element 12, homogenized by the light homogenizing element 13, and reflected by the reflecting mirror 15 and then incident on the beam splitting prism 21. The light beam after passing through the beam splitting prism 21 is incident on the LCOS device 22. The LCOS device 22 modulates the light beam into image light with image information and transmits it to the projection lens 23 through the beam splitting prism 21. The projection lens 23 is used to project the modulated image light to form an image. This LCOS optical system can reduce the illumination space, thereby reducing the overall volume of the LCOS optical system.

[0031] The LCOS optical system provided by this application includes an illumination component 10 and an imaging component 20. Among them, please refer to Figure 1 as shown, the illumination component 10 at least includes a light source 11, a collimating element 12, a homogenizing element, and a reflecting mirror 15.

[0032] In this embodiment, the light source 11 is an RGB three-color light source 11 or an RGB three-color LED light source 11. In this way, three colors of output can be achieved by using one light source 11, which can reduce the volume of the LCOS optical system. It should be noted that the LCOS optical system in the prior art includes two light sources, one of which is a green LED, and the other is a two-in-one LED combining red and blue. The angle between the green collimation optical path and the red-blue collimation optical path is mostly between 90° and 120°. In this way, it is convenient for the three colors of RGB light to be combined and emitted through a color combiner, and then the light is distributed through a fly-eye lens for subsequent optical transmission. This is also a relatively conventional Köhler illumination scheme. Because of the two collimation modules and the color combiner part in the prior art solution, the entire illumination structure appears to be large and its shape is not regular enough, which is not conducive to the stacking of the optical engine structure, resulting in a large waste of space in the overall optical engine structure.

[0033] By using one light source 11 to achieve three-color output in this application, at least one set of collimation module and light homogenization module in the prior art can be omitted, and the color combiner can be omitted, which can greatly reduce the overall volume of the LCOS optical system.

[0034] For the structure of the light source 11 of this application, please refer to Figure 2 As shown, the light source 11 includes four light-emitting crystals, namely R, G, G, and B, which are arranged in a rectangular pattern. Among them, the G light crystals are diagonally distributed, and R and B are diagonally distributed. Of course, the fact that the light source 11 includes four light-emitting crystals is only an example. In other embodiments, other structural forms can also be adopted. This application does not limit this, as long as the light source 11 can emit R, G, and B three-color light beams.

[0035] The collimation element 12 is arranged on the light-emitting side of the light source 11 and is used to collimate the light beam emitted by the light source 11. Among them, optionally, the collimation element 12 may include a first collimation mirror 121 and a second collimation mirror 122 arranged between the first collimation mirror 121 and the light homogenization element 13, as Figure 1 and Figure 4 shown.

[0036] Alternatively, the collimation element 12 may not adopt the above traditional collimation lens, but a reflector cup 123, as Figure 3 shown. In this way, the cost of the LCOS optical system can be reduced to a certain extent.

[0037] The above-mentioned light homogenizing element 13 is used for homogenizing the light beam, responsible for diffusing the light beam and redistributing the light. Optionally, the light homogenizing element 13 can be a fly-eye lens or a diffuser sheet. Among them, the two opposite surfaces of the fly-eye lens respectively include an array of curved surface structures. It should be noted that the light processing effect of the fly-eye lens is better than that of the diffuser sheet, which can further improve the lighting effect; the diffuser sheet can reduce the cost to a certain extent. Those skilled in the art can choose any one of the fly-eye lens and the diffuser sheet as the homogenizing element according to actual needs, and the present application does not make specific restrictions on this.

[0038] The mirror 15 is arranged on the light-emitting side of the homogenizing element, and the mirror 15 is used for reflecting the light beam into the imaging assembly 20. A total reflection film can be provided on the surface of the mirror 15 facing the imaging assembly 20.

[0039] The imaging assembly 20 includes a beam splitting prism 21, an LCOS device 22, and a projection lens 23. Among them, the beam splitting prism 21 can be a PBS prism. The PBS prism is a prism formed by bonding the bases of two 45° isosceles right prisms, which can split the incident unpolarized light into two perpendicular linearly polarized lights. These two lights are the P-polarized light and the S-polarized light respectively. Among them, the P-polarized light completely passes through the prism, while the S-polarized light is reflected at an angle of 45°, and the outgoing direction forms a 90° angle with the P-polarized light.

[0040] In this embodiment, the PBS prism contains a reflective polarizer, and the reflective polarizer is located between the two isosceles right prisms of the PBS. Of course, the above-mentioned reflective polarizer can also be a polarized beam splitting film deposited.

[0041] The LCOS device 22 is arranged on one side of the beam splitting prism 21, and is used for modulating the light beam emitted from the beam splitting prism 21 into image light with image information and transmitting it to the projection lens 23.

[0042] Among them, the above-mentioned projection lens 23 is used for projecting the modulated image light to form an image. Exemplarily, the above-mentioned projection lens 23 can include, for example Figure 1 The first lens 231, the second lens 232, the third lens 233, the fourth lens 234, the fifth lens 235, and the sixth lens 236 which are sequentially arranged on one side of the beam splitting prism 21 as shown.

[0043] Optionally, the above-mentioned first lens 231 and the second lens 232 can be of a biconvex structure, the third lens 233 and the fourth lens 234 can be of a biconcave lens structure, the second lens 232 and the third lens 233 can be of a doublet lens (the second lens 232 and the third lens 233 are glued together), the fifth lens 235 is of a crescent structure, and the sixth lens 236 is of a plano-convex structure. The positional relationship between each lens can refer to Figure 1As shown, the optical surfaces of the first lens 231, the second lens 232, the third lens 233, the fourth lens 234, the fifth lens 235 and the sixth lens 236 can be applicable to spherical surfaces or other aspherical surfaces. Of course, the above structure is only one example of the projection lens 23. The projection lens 23 of the present application is not limited to this design. Any other structure of the projection lens 23 can also be applied to this LCOS optical system.

[0044] In summary, the LCOS optical system provided by the present application includes an illumination component 10 and an imaging component 20 disposed on the light-emitting side of the illumination component 10; the illumination component 10 includes a light source 11, and a collimating element 12, a light homogenizing element 13, and a reflector 15 disposed in sequence on the light-emitting side of the light source 11; the imaging component 20 includes a beam splitting prism 21, an LCOS device 22, and a projection lens 23. The beam splitting prism 21 is located on the light-emitting side of the reflector 15; the light source 11 is an RGB three-color light source 11; the light beam emitted by the light source 11 is incident on the beam splitting prism 21 after being collimated by the collimating element 12, homogenized by the light homogenizing element 13, and reflected by the reflector 15. The light beam after passing through the beam splitting prism 21 is incident on the LCOS device 22. The LCOS device 22 modulates the light beam into image light with image information and transmits it to the projection lens 23 through the beam splitting prism 21. The projection lens 23 is used to project and image the modulated image light. Since the illumination component 10 of the LCOS optical system of the present application uses an RGB three-color light source 11, compared with the traditional solution, the second collimation module and the color combining mirror part can be removed, greatly reducing the illumination space and making the overall size of the illumination component 10 comparable to the size of the imaging component 20. Therefore, it is beneficial to stack the illumination component 10 and the imaging component 20 vertically and parallelly, making full use of the space and thus reducing the overall volume of the LCOS optical system.

[0045] Optionally, the illumination component 10 further includes a first relay mirror 14 and a second relay mirror 16. Among them, the first relay mirror 14 is located between the light-emitting side of the light homogenizing element 13 and the light-incident side of the reflector 15, and the second relay mirror 16 is located between the light-emitting side of the reflector 15 and the light-incident side of the beam splitting prism 21.

[0046] It should be noted that the first relay mirror 14 can further shape the light beam to output a uniform light beam, thereby improving the projection imaging quality. In this way, the illumination component 10 of the LCOS optical system can be made more stable and have better effects.

[0047] The above-mentioned second relay mirror 16 is located between the reflector 15 and the reflecting prism and is also a bridge connecting the illumination component 10 and the imaging component 20. Through the second relay mirror 16, the quality of the light beam reflected by the reflector 15 and incident into the imaging component 20 can be better.

[0048] Furthermore, in this embodiment, please refer toFigure 1 , Figure 3 or Figure 4 , the light source 11, the collimating element 12, the light homogenizing element 13, the first relay mirror 14, and the reflecting mirror 15 are arranged along the first direction a; the arrangement direction of the beam splitting prism 21 and the projection lens 23 is parallel to the first direction a; the reflecting mirror 15, the second relay mirror 16, and the beam splitting prism 21 are arranged along the second direction b, and the first direction a is perpendicular to the second direction b. In this way, the layout structure of the LCOS optical system is more reasonable, and the space can be effectively utilized, which is beneficial to the miniaturization of the LCOS optical system.

[0049] This application does not limit the setting position of the LCOS device 22. For example, the LCOS device 22 can be arranged on the reflection side of the beam splitting prism 21, or the LCOS device 22 can be arranged on the transmission side of the beam splitting prism 21. This application does not limit the specific setting position of the LCOS device 22, and those skilled in the art can select any feasible setting method according to the actual layout requirements.

[0050] For example, in a feasible implementation manner, please refer to Figure 1 and Figure 3 shown. Optionally, the LCOS device 22 and the projection lens 23 are respectively located on the opposite sides of the beam splitting prism 21. That is to say, the LCOS device 22 is arranged on the reflection side of the beam splitting prism 21. In this way, the light beam incident on the beam splitting prism 21 by the illumination assembly 10 can be incident on the LCOS device 22 after being reflected by the beam splitting prism 21. After being modulated by the LCOS device 22, an image light with image information is formed and incident on the beam splitting prism 21 again, and then is incident on the projection lens 23 after being transmitted by the beam splitting prism 21.

[0051] For another example, in another feasible implementation manner, please refer to Figure 4 shown. Optionally, the LCOS device 22 and the second relay mirror 16 are respectively located on the opposite sides of the beam splitting prism 21. That is to say, the LCOS device 22 is located on the transmission side of the beam splitting prism 21. In this way, the light beam incident on the beam splitting prism 21 by the illumination assembly 10 can be incident on the LCOS device 22 after passing through the beam splitting prism 21. After being modulated by the LCOS device 22, an image light with image information is formed and incident on the beam splitting prism 21 again, and then is incident on the projection lens 23 after being reflected by the beam splitting prism 21.

[0052] To further improve the imaging quality, optionally, a first absorption type polarizing element 24 is provided between the second relay mirror 16 and the beam splitting prism 21, a first phase retardation wave plate 25 is provided between the LCOS device 22 and the beam splitting prism 21, and a second absorption type polarizing element 26 and a second phase retardation wave plate 27 are provided between the beam splitting prism 21 and the projection lens 23.

[0053] The first phase retardation wave plate 25 is used to improve imaging contrast. In this embodiment, the first phase retardation wave plate 25 is bonded between the beam splitter prism 21 and the LCOS device 22. This not only reduces stray light from the AR surface but also compensates for polarization relationships and provides polarization degree, thereby improving contrast. Specifically, there are no other optical lenses between the beam splitter prism 21 and the LCOS device 22. Instead, the first phase retardation wave plate 25 is added to compensate for the polarization degree of the optical beam reflected back from the LCOS device 22. By bonding them together into a single unit, Fresnel stray light is reduced, effectively improving optical imaging contrast.

[0054] The second absorbing polarizer 26 is located between the beam splitter prism 21 and the second phase retardation wave plate 27. The second absorbing polarizer 26 and the second phase retardation wave plate 27 are attached to the side of the beam splitter prism 21 facing the projection lens 23. This effectively prevents light returning from the surface of the projection lens 23 from reentering the LCOS device 22 (i.e., it prevents stray light returning from the projection lens 23), thereby improving the contrast of the final projected image.

[0055] In addition, it should be noted that the beam splitter prism 21 and the projection lens 23 of the present application are independent of each other, and the second absorbing polarization element 26 and the second phase retardation wave plate 27 are attached to the surface of the beam splitter prism 21 facing the projection lens 23 .

[0056] Alternatively, the LCOS device 22, the first phase retardation wave plate 25, the beam splitter 21, the first absorptive polarizer 24, the second absorptive polarizer 26, and the second phase retardation wave plate 27 may be glued together into an integrated structure. This facilitates imaging and improves imaging contrast.

[0057] Another aspect of the present invention provides an AR device comprising the aforementioned LCOS optical system. The specific structure and technical effects of the aforementioned LCOS optical system have been previously described and illustrated in detail, and therefore will not be further elaborated upon in this application. An AR device employing the aforementioned LCOS optical system can reduce the illumination space, thereby reducing the overall volume of the LCOS optical system.

[0058] The above description is merely an optional embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0059] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present utility model will not separately describe various possible combination manners.

Claims

1. An LCOS optical system, characterized in that, It includes an illumination component and an imaging component provided on the light-emitting side of the illumination component; the illumination component includes a light source, and a collimating element, a light homogenizing element, and a reflector sequentially provided on the light-emitting side of the light source; the imaging component includes a beam splitter prism, an LCOS device, and a projection lens, and the beam splitter prism is located on the light-emitting side of the reflector; the light source is an RGB three-color light source; The light beam emitted by the light source is sequentially collimated by the collimating element, homogenized by the light homogenizing element, and reflected by the reflector and then incident on the beam splitter prism. After passing through the beam splitter prism, the light beam is incident on the LCOS device. The LCOS device modulates the light beam into image light with image information and transmits it to the projection lens through the beam splitter prism. The projection lens is used to project the modulated image light to form an image.

2. The LCOS optical system according to claim 1, wherein The illumination component further includes a first relay lens and a second relay lens. Among them, the first relay lens is located between the light-emitting side of the light homogenizing element and the light-incident side of the reflector, and the second relay lens is located between the light-emitting side of the reflector and the light-incident side of the beam splitter prism.

3. The LCOS optical system according to claim 2, characterized in that, The light source, the collimating element, the light homogenizing element, the first relay lens, and the reflector are arranged in a first direction; the arrangement direction of the beam splitter prism and the projection lens is parallel to the first direction; the reflector, the second relay lens, and the beam splitter prism are arranged in a second direction, and the first direction is perpendicular to the second direction.

4. The LCOS optical system according to claim 3, wherein, The LCOS device and the projection lens are respectively located on opposite sides of the beam splitter prism.

5. The LCOS optical system according to claim 3, wherein The LCOS device and the second relay lens are respectively located on opposite sides of the beam splitter prism.

6. The LCOS optical system according to claim 2, characterized in that, A first absorption-type polarizing element is provided between the second relay lens and the beam splitter prism, a first phase retardation wave plate is provided between the LCOS device and the beam splitter prism, and a second absorption-type polarizing element and a second phase retardation wave plate are provided between the beam splitter prism and the projection lens.

7. The LCOS optical system according to claim 6, wherein The LCOS device, the first phase retardation wave plate, the beam splitter prism, the first absorption-type polarizing element, the second absorption-type polarizing element, and the second phase retardation wave plate are glued into an integral structure.

8. The LCOS optical system according to claim 1, characterized in that, The collimating element includes a first collimating mirror and a second collimating mirror provided between the first collimating mirror and the light homogenizing element; Alternatively, the collimating element is a reflector cup.

9. The LCOS optical system according to claim 1, wherein The light homogenizing element is a fly-eye lens or a diffuser sheet.

10. An AR device, characterized in that, It includes the LCOS optical system according to any one of claims 1 to 9.

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