LCOS optical system and AR device

Abstract

The utility model discloses an LCOS optical system and AR equipment, and relates to the technical field of augmented reality. The LCOS optical system comprises an illumination module and an imaging module, the illumination module comprises a light source, a light guide element and a dodging element, the light source is arranged along the peripheral side of the light guide element, one side of the light guide element is provided with a lattice point array structure, the other side of the light guide element is provided with the dodging element, and the imaging module comprises a beam splitter prism, an LCOS device and a projection lens. The beam splitter prism is positioned on the light emitting side of the dodging element; a light beam emitted by the light source is guided by the light guide element and homogenized by the light homogenizing element in sequence, then enters the beam splitter prism and enters the LCOS device after passing through the beam splitter prism, the LCOS device modulates the light beam into image light, the image light is transmitted to the projection lens after passing through the beam splitter prism, and the image light is projected and imaged through the projection lens. According to the LCOS optical system and the AR equipment, the illumination space can be reduced, and the miniaturization of the LCOS optical system and the AR equipment can be realized.

Description

Technical Field

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

[0002] Augmented Reality (AR) technology combines the virtual environment generated by a computer with the surrounding display environment of a user by means of optoelectronic display technology, interaction technology, various sensor technologies, and computer graphics and multimedia technology, making the user convinced that the virtual environment is an integral part of the real environment around them in terms of sensory effects.

[0003] Currently, the solutions of AR devices on the market mainly consist of a projection optical engine and a waveguide. Considering the low light utilization efficiency of the waveguide, Liquid Crystal On Silicon (LCOS) display technology has gradually become the mainstream solution. The traditional lighting solutions for LCOS all use two LED lights, a color combiner, and a relay lens. This solution has a relatively large structure and an irregular shape, which is not conducive to the stacking of the optical engine structure, resulting in a waste of the overall optical engine structure space. 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 and contribute to the miniaturization of the LCOS optical system and the AR device.

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

[0006] In a first aspect of an embodiment of the utility model, an LCOS optical system is provided, which includes an illumination module and an imaging module disposed on the light-emitting side of the illumination module. The illumination module includes a light source, a light guide element, and a light homogenizing element. The light source is arranged along the circumferential side of the light guide element. A dot array structure is provided on one side of the light guide element, and the light homogenizing element is provided on the other side. The imaging module includes a beam splitting prism, an LCOS device, and a projection lens. The beam splitting prism is located on the light-emitting side of the light homogenizing element. The light beam emitted by the light source is sequentially guided by the light guide element and homogenized by the light homogenizing element, then incident on the beam splitting prism, passes through the beam splitting prism, and then is incident on the LCOS device. The LCOS device modulates the light beam into image light with image information, passes through the beam splitting prism, and then is transmitted to the projection lens, so as to project and form an image of the image light through the projection lens. This LCOS optical system can reduce the lighting space and contribute to the miniaturization of the LCOS optical system and the AR device.

[0007] As an implementable mode, the lighting module further includes a relay mirror, and the relay mirror is located between the light homogenizing element and the beam splitting prism.

[0008] As an implementable mode, the projection lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The light guiding element, the light homogenizing element, the relay mirror, the beam splitting prism, the first lens, and the second lens are arranged in sequence along a first direction. The third lens, the beam splitting prism, the fourth lens, the fifth lens, and the LCOS device are arranged in sequence along a second direction. A reflective film is provided on a side of the third lens away from the beam splitting prism. The first direction is perpendicular to the second direction.

[0009] As an implementable mode, the projection lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The third lens, the beam splitting prism, the first lens, and the second lens are arranged in sequence along a first direction. The light guiding element, the light homogenizing element, the relay mirror, the beam splitting prism, the fourth lens, the fifth lens, and the LCOS device are arranged in sequence along a second direction. A reflective film is provided on a side of the third lens away from the beam splitting prism. The first direction is perpendicular to the second direction.

[0010] As an implementable mode, a first absorption type polarizing element is provided between the relay mirror and the beam splitting prism. A second absorption type polarizing element and a first phase retardation wave plate are sequentially provided between the beam splitting prism and the first lens. A second phase retardation wave plate is provided between the third lens and the beam splitting prism.

[0011] As an implementable mode, the first absorption type polarizing element, the beam splitting prism, the second absorption type polarizing element, the first phase retardation wave plate, the first lens, and the second lens are sequentially glued together, and the third lens, the second phase retardation wave plate, the beam splitting prism, the fourth lens, and the fifth lens are sequentially glued together to form an integral structure.

[0012] As an implementable mode, the light source includes at least one red light source, at least one green light source, and at least one blue light source. The red light source, the green light source, and the blue light source are respectively arranged along the circumferential side of the light guiding element.

[0013] As an implementable mode, the beam splitting prism is a PBS prism. The PBS prism includes two triangular prisms and a reflective type polarizing element. The bottom surfaces of the two triangular prisms are glued together, and the reflective type polarizing element is located between the two triangular prisms.

[0014] As an implementable mode, the dot array structure is a diffusing point, a convex lens or a concave lens, and the light homogenizing element is a compound eye lens.

[0015] In a second aspect of the embodiments of the present invention, an AR device is provided, including the above LCOS optical system. This LCOS optical system can reduce the illumination space, which helps to miniaturize the LCOS optical system and the AR device.

[0016] The beneficial effects of the embodiments of the present invention include:

[0017] The LCOS optical system provided in the present application includes an illumination module and an imaging module disposed on the light-emitting side of the illumination module. The illumination module includes a light source, a light guiding element, and a light homogenizing element. The light source is arranged along the circumferential side of the light guiding element. A dot array structure is provided on one side of the light guiding element, and a light homogenizing element is provided on the other side. The imaging module includes a beam splitting prism, an LCOS device, and a projection lens. The beam splitting prism is located on the light-emitting side of the light homogenizing element. The light beam emitted by the light source is incident on the beam splitting prism after passing through the light guiding of the light guiding element and the light homogenizing of the light homogenizing element, and then passes through the beam splitting prism and 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 splitting prism, so as to project and form an image of the image light through the projection lens. Compared with the LCOS illumination scheme in the prior art, by introducing a light guiding element with a dot array structure in the present application and arranging the light source along the circumferential side of the light guiding element, the light source can be decomposed into point light sources corresponding one by one to the dot array structure, and then uniformly incident on the imaging module through the subsequent optical path. Since the collimation module and the dichroic mirror in the LCOS illumination scheme in the prior art are omitted, the overall volume of the LCOD optical system can be significantly reduced, which helps to miniaturize the LCOS optical system and the AR device. Description of the Drawings

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

[0019] Figure 1 It is a schematic structural diagram of the LCOS optical system provided in an embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of the illumination module provided in the embodiment of the present invention;

[0021] Figure 3One of the schematic structural diagrams of the light source and the light guide element provided by the embodiment of the present invention;

[0022] Figure 4 Another schematic structural diagram of the light source and the light guide element provided by the embodiment of the present invention;

[0023] Figure 5 Schematic structural diagram of the LCOS optical system provided by another embodiment of the present invention.

[0024] Reference numerals: 100 - LCOS optical system; 10 - light source; 101 - red light source; 102 - green light source; 103 - blue light source; 20 - light guide element; 21 - dot array structure; 30 - light homogenizing element; 40 - relay mirror; 50 - beam splitting prism; 51 - triangular prism; 52 - reflective polarizing element; 60 - LCOS device; 71 - first lens; 72 - second lens; 73 - third lens; 731 - reflective film; 74 - fourth lens; 75 - fifth lens; 81 - first absorptive polarizing element; 82 - second absorptive polarizing element; 83 - first phase retardation wave plate; 84 - second phase retardation wave plate; a - first direction; b - second direction. Detailed implementation manners

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] It should be noted that: similar reference numerals and letters denote similar 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.

[0028] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is customarily 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 therefore should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0029] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required 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.

[0030] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, terms such as "set", "installed", "connected", "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 can be the connection inside two elements. 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 situations.

[0031] The LCOS lighting scheme in the prior art includes two LED light sources, one of which is a green LED light source, and the other is a two-in-one LED light source combining red and blue light. 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 RGB three-color light to be combined and emitted through the color combiner, and then the light is distributed through the fly-eye lens for subsequent optical transmission. This is also a relatively conventional LCOS lighting scheme. Since the LCOS lighting scheme in the prior art has two collimation modules and a color combiner part, the entire lighting structure is likely to appear larger and the 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.

[0032] Please refer to Figures 1 to 5, an embodiment of the present application provides an LCOS optical system 100, which includes an illumination module and an imaging module disposed on the light-emitting side of the illumination module. The illumination module includes a light source 10, a light guide element 20, and a light homogenizing element 30. The light source 10 is arranged along the circumferential side of the light guide element 20. A dot array structure 21 is provided on one side of the light guide element 20, and a light homogenizing element 30 is provided on the other side. The imaging module includes a beam splitting prism 50, an LCOS device 60, and a projection lens. The beam splitting prism 50 is located on the light-emitting side of the light homogenizing element 30. The light beam emitted by the light source 10 is incident on the beam splitting prism 50 after passing through the light guiding of the light guide element 20 and the light homogenizing of the light homogenizing element 30, and then passes through the beam splitting prism 50 and is incident on the LCOS device 60. The LCOS device 60 modulates the light beam into image light with image information and transmits it to the projection lens through the beam splitting prism 50, so as to project and form an image of the image light through the projection lens. The LCOS optical system 100 can reduce the illumination space, which helps to miniaturize the LCOS optical system 100 and the AR device.

[0033] It should be noted that, as Figure 1 and Figure 5 shown, the LCOS optical system 100 includes an illumination module and an imaging module, so as to provide illumination for the LCOS optical system 100 through the illumination module, and project and form an image of the light beam emitted by the illumination module through the imaging module, so as to meet the usage requirements of the AR device.

[0034] Specifically, as Figures 2 to 4 shown, the illumination module at least includes a light source 10, a light guide element 20, and a light homogenizing element 30. Among them, when designing the layout of the illumination module, the light source 10 is arranged along the circumferential side of the light guide element 20. In addition, a dot array structure 21 is provided on one side of the light guide element 20, and a light homogenizing element 30 is provided on the other side opposite to one side of the light guide element 20. Exemplarily, the light guide element 20 is a light guide plate.

[0035] In this way, the total reflection characteristic of the light guide element 20 can be utilized to make the light beam emitted by the light source 10 uniformly irradiate on the dot array structure 21 located on one side of the light guide element 20, and the function of total reflection is destroyed by the dot array structure 21, so that the light beam irradiates on the dot array structure 21 and then shoots towards the light homogenizing element 30 located on the other side of the light guide element 20, and then is incident on the imaging module after the light homogenizing effect of the light homogenizing element 30.

[0036] As an implementable manner, the light source 10 includes at least one red light source 101, at least one green light source 102, and at least one blue light source 103. The red light source 101, the green light source 102, and the blue light source 103 are respectively arranged along the circumferential side of the light guide element 20. Exemplarily, as Figure 3 and Figure 4As shown, in this embodiment, the light source 10 includes a red light source 101, two green light sources 102, and a blue light source 103. Among them, the red light source 101 and the blue light source 103 are respectively located on opposite sides of the light guide element 20, and the two green light sources 102 are respectively located on the other opposite sides of the light guide element 20. Regarding the specific selection and actual layout of the light source 10, those skilled in the art should be able to make reasonable selections and designs according to the actual situation, and no specific limitations are made here.

[0037] As an implementable manner, the dot array structure 21 described above can be a diffusing dot, a convex lens, or a concave lens. During the production and manufacturing process, the diffusing dot can be made on one of the large surfaces of the light guide element 20 through laser engraving, V-shaped cross-grid engraving, UV screen printing technology, etc. The light guide element 20 with the dot array structure 21 on one side can adopt an extrusion molding manufacturing process.

[0038] As an implementable manner, the light homogenizing element 30 is a fly-eye lens, so as to perform light homogenizing processing on the light beam through the light homogenizing element 30, converge and redistribute the light beam, thereby improving the light efficiency and adjusting the angular distribution of the light. Among them, the two opposite surfaces of the fly-eye lens respectively include an array of curved surface structures, and its array structure corresponds one-to-one with the dot array structure 21, which can further improve the lighting effect. Regarding the specific selection of the light homogenizing element 30, those skilled in the art should be able to make reasonable selections and designs according to the actual situation, and no specific limitations are made here.

[0039] As Figure 1 and Figure 5 shown, the imaging module includes a beam splitter prism 50. The beam splitter prism 50 is located on the light output side of the light homogenizing element 30. Among them, the beam splitter prism 50 can be a PBS prism. The PBS prism includes two triangular prisms 51. The bottom surface shapes of the two triangular prisms 51 are isosceles right triangles. During the production and manufacturing process, the bottom surfaces of the two triangular prisms 51 can be glued together to split the incident unpolarized light into two perpendicular linearly polarized lights. These two perpendicular linearly polarized lights are respectively P-polarized light and S-polarized light. Among them, the P-polarized light completely passes through the PBS prism, while the S-polarized light is reflected at an angle of 45°, and the output direction forms a 90° angle with the P-polarized light.

[0040] On this basis, the PBS prism further includes a reflective polarizing element 52. The reflective polarizing element 52 is located between the two triangular prisms 51. Exemplarily, the reflective polarizing element 52 is a reflective polarizing film, or the reflective polarizing element 52 is a polarization beam splitting film deposited on the bottom surface of one of the triangular prisms 51.

[0041] As Figure 1 and Figure 5As shown in the figure, the imaging module further includes an LCOS device 60 and a projection lens. The LCOS device 60 is disposed on one side of the beam splitting prism 50. The LCOS device 60 is configured to modulate the light beam emitted from the beam splitting prism 50 into an image light with image information, and transmit it to the projection lens through the beam splitting prism 50. The projection lens is configured to project and image the modulated image light.

[0042] As an implementable manner, the projection lens includes a first lens 71, a second lens 72, a third lens 73, a fourth lens 74, and a fifth lens 75. Among them, the first lens 71 can be a plano-concave structure, the second lens 72 can be a biconvex structure, the third lens 73 can be a plano-convex structure, the fourth lens 74 can be a plano-convex structure, and the fifth lens 75 can be a crescent structure. Regarding the specific selection of the projection lens, those skilled in the art should be able to make reasonable selections and designs according to the actual situation, and no specific limitations are made here.

[0043] In summary, the LCOS optical system 100 provided in this application includes an illumination module and an imaging module disposed on the light-emitting side of the illumination module. The illumination module includes a light source 10, a light guide element 20, and a light homogenizing element 30. The light source 10 is arranged along the circumferential side of the light guide element 20. A dot array structure 21 is disposed on one side of the light guide element 20, and a light homogenizing element 30 is disposed on the other side. The imaging module includes a beam splitting prism 50, an LCOS device 60, and a projection lens. The beam splitting prism 50 is located on the light-emitting side of the light homogenizing element 30. The light beam emitted by the light source 10 is sequentially guided by the light guide element 20 and homogenized by the light homogenizing element 30, then enters the beam splitting prism 50, passes through the beam splitting prism 50, and then enters the LCOS device 60. The LCOS device 60 modulates the light beam into an image light with image information and transmits it to the projection lens through the beam splitting prism 50, so as to project and image the image light through the projection lens. Compared with the LCOS illumination scheme in the prior art, by introducing the light guide element 20 with a dot array structure 21 and arranging the light source 10 along the circumferential side of the light guide element 20 in this application, the light source 10 can be decomposed into point light sources corresponding one by one to the dot array structure 21, and then uniformly enter the imaging module through the subsequent optical path. Since the collimation module and the dichroic mirror in the LCOS illumination scheme in the prior art are omitted, the overall volume of the LCOD optical system can be significantly reduced, which helps to miniaturize the LCOS optical system 100 and the AR device.

[0044] As an implementable manner, as Figure 1 and Figure 5As shown, the illumination module further includes a relay mirror 40. The relay mirror 40 is located between the light homogenizing element 30 and the beam splitting prism 50 to further shape the light beam through the relay mirror 40, so as to output a uniform light beam, thereby improving the projection imaging quality. In this way, the illumination module of the LCOS optical system 100 can be made more stable and have better effects.

[0045] In some embodiments, as Figure 1 shown, the light guide element 20, the light homogenizing element 30, the relay mirror 40, the beam splitting prism 50, the first lens 71 and the second lens 72 are arranged in sequence along the first direction a. The third lens 73, the beam splitting prism 50, the fourth lens 74, the fifth lens 75 and the LCOS device 60 are arranged in sequence along the second direction b. A reflective film 731 is provided on the side of the third lens 73 away from the beam splitting prism 50. The first direction a is perpendicular to the second direction b. In other embodiments, as Figure 5 shown, the third lens 73, the beam splitting prism 50, the first lens 71 and the second lens 72 are arranged in sequence along the first direction a. The light guide element 20, the light homogenizing element 30, the relay mirror 40, the beam splitting prism 50, the fourth lens 74, the fifth lens 75 and the LCOS device 60 are arranged in sequence along the second direction b. A reflective film 731 is provided on the side of the third lens 73 away from the beam splitting prism 50. The first direction a is perpendicular to the second direction b.

[0046] Regardless of which of the above layout methods is adopted, the layout structure of the LCOS optical system 100 can be made more reasonable, and the space can be effectively utilized, which is beneficial to the miniaturization of the LCOS optical system 100. Regarding the layout method of the LCOS optical system 100, those skilled in the art should be able to make a reasonable selection and design according to the actual situation, and no specific limitation is made here.

[0047] In order to further improve the imaging contrast, as an implementable method, a first absorption type polarizing element 81 is provided between the relay mirror 40 and the beam splitting prism 50 to absorb the stray light on the AR surface through the first absorption type polarizing element 81. A second absorption type polarizing element 82 and a first phase retardation wave plate 83 are sequentially provided between the beam splitting prism 50 and the first lens 71 to absorb the leakage light of the reflective polarizing element 52 and the stray light reflected back into the beam splitting prism 50 from the outside of the second lens 72. A second phase retardation wave plate 84 is provided between the third lens 73 and the beam splitting prism 50 to compensate the optical polarization degree reflected back by the LCOS device 60 through the second phase retardation wave plate 84.

[0048] As an implementable manner, the first absorptive polarizing element 81, the beam splitting prism 50, the second absorptive polarizing element 82, the first phase retardation wave plate 83, the first lens 71 and the second lens 72 are glued in sequence, and the third lens 73, the second phase retardation wave plate 84, the beam splitting prism 50, the fourth lens 74 and the fifth lens 75 are glued in sequence to form an integral structure, thereby reducing Fresnel stray light and further improving the imaging contrast.

[0049] The embodiment of the present application further provides an AR device, including the above-mentioned LCOS optical system 100. Since the structure and beneficial effects of the LCOS optical system 100 have been described in detail in the foregoing embodiments, they will not be elaborated herein.

[0050] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0051] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination manners.

Claims

1. An LCOS optical system, characterized in that: The invention comprises an illumination module and an imaging module arranged on the light-emitting side of the illumination module, wherein the illumination module comprises a light source, a light guide element and a light homogenizing element, wherein the light source is arranged along the circumference of the light guide element, a dot array structure is arranged on one side of the light guide element, and the light homogenizing element is arranged on the other side, and the imaging module comprises a beam splitter prism, an LCOS device and a projection lens, wherein the beam splitter prism is located on the light-emitting side of the light homogenizing element; The light beam emitted by the light source is incident on the beam splitter prism after passing through the light guiding element and the light homogenizing element in sequence, and then is incident on the LCOS device after passing through the beam splitter prism. The LCOS device modulates the light beam into image light with image information and transmits it to the projection lens after passing through the beam splitter prism, so as to project the image light into an image through the projection lens.

2. The LCOS optical system according to claim 1, characterized in that: The illumination module further comprises a relay lens, and the relay lens is located between the light homogenizing element and the beam splitting prism.

3. The LCOS optical system according to claim 2, characterized in that: The projection lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The light guide element, the light homogenizing element, the relay lens, the beam splitter prism, the first lens and the second lens are arranged in sequence along a first direction. The third lens, the beam splitter prism, the fourth lens, the fifth lens and the LCOS device are arranged in sequence along a second direction. A reflective film is provided on a side of the third lens away from the beam splitter prism, and the first direction is perpendicular to the second direction.

4. The LCOS optical system according to claim 2, characterized in that: The projection lens includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens, the third lens, the beam splitter prism, the first lens and the second lens are arranged in sequence along a first direction, the light guide element, the light homogenizing element, the relay lens, the beam splitter prism, the fourth lens, the fifth lens and the LCOS device are arranged in sequence along a second direction, a reflective film is provided on a side of the third lens away from the beam splitter prism, and the first direction is perpendicular to the second direction.

5. The LCOS optical system according to claim 3 or 4, characterized in that: A first absorption polarizing element is arranged between the relay lens and the beam splitter prism, a second absorption polarizing element and a first phase delay wave plate are arranged in sequence between the beam splitter prism and the first lens, and a second phase delay wave plate is arranged between the third lens and the beam splitter prism.

6. The LCOS optical system according to claim 5, characterized in that: The first absorption-type polarizing element, the beam splitter, the second absorption-type polarizing element, the first phase retardation wave plate, the first lens and the second lens are glued in sequence, and the third lens, the second phase retardation wave plate, the beam splitter, the fourth lens and the fifth lens are glued in sequence to form an integrated structure.

7. The LCOS optical system according to claim 1, characterized in that: The light sources include at least one red light source, at least one green light source and at least one blue light source, and the red light source, the green light source and the blue light source are respectively arranged along the circumference of the light guide element.

8. The LCOS optical system according to claim 1, characterized in that: The beam splitter prism is a PBS prism, which includes two prisms and a reflective polarizing element. The bottom surfaces of the two prisms are glued together, and the reflective polarizing element is located between the two prisms.

9. The LCOS optical system according to claim 1, characterized in that: The grid point array structure is a scattered light point, a convex lens or a concave lens, and the light homogenizing element is a compound eye lens.

10. An AR device, characterized in that: An LCOS optical system comprising any one of claims 1 to 9.

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