An LCOS optical system and AR device

Abstract

This application discloses an LCOS optical system and an AR device, relating to the field of augmented reality technology. The LCOS optical system 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 first collimation module, and a light-uniforming element. The imaging module includes a beam splitter, an LCOS device, and a projection lens, with the first collimation module, the light-uniforming element, and the beam splitter arranged sequentially along the light-emitting direction of the light source. The light beam emitted from the light source is collimated by the first collimation module and uniformly irradiated by the light-uniforming element before entering the beam splitter. After passing through the beam splitter, it enters the LCOS device, where the LCOS device modulates the beam into image light carrying image information. This image light is then transmitted to the projection lens through the beam splitter to project an image. This LCOS optical system and AR device can reduce the illumination space, contributing to the miniaturization of the LCOS optical system and AR device.

Description

Technical Field

[0001] This application relates to the field of augmented reality technology, and more specifically, to an LCOS optical system and AR device. Background Technology

[0002] Augmented Reality (AR) technology uses optoelectronic display technology, interactive technology, multiple sensor technology, and computer graphics and multimedia technology to integrate a computer-generated virtual environment with the user's surrounding display environment, making the user feel that the virtual environment is a part of their real environment through sensory effects.

[0003] Currently, most AR devices on the market consist of a projection optical engine and a waveguide. However, considering the low light utilization efficiency of waveguides, liquid crystal on silicon (LCOS) display technology is gradually becoming the mainstream solution. Traditional LCOS illumination schemes use two LEDs, a color-combining mirror, and a repeater mirror. This scheme 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 space in the overall optical engine structure. Utility Model Content

[0004] The purpose of this application is to provide an LCOS optical system and AR device that can reduce the lighting space and help to achieve miniaturization of the LCOS optical system and AR device.

[0005] The embodiments of this application are implemented as follows:

[0006] A first aspect of this application provides an LCOS optical system, including 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 first collimation module, and a homogenizing element. The imaging module includes a beam splitter, an LCOS device, and a projection lens. The first collimation module, the homogenizing element, and the beam splitter are arranged sequentially along the light-emitting direction of the light source. The light beam emitted from the light source is collimated by the first collimation module and homogenized by the homogenizing element before being incident on the beam splitter. After passing through the beam splitter, it is incident on the LCOS device. The LCOS device modulates the light beam into image light carrying image information and transmits it to the projection lens after passing through the beam splitter, so as to project the image light into an image. This LCOS optical system can reduce the illumination space, which helps to realize the miniaturization of LCOS optical systems and AR devices.

[0007] In one possible implementation, the light source includes at least one light-emitting crystal, and the first collimation module includes at least one first collimating lens, wherein at least one first collimating lens corresponds one-to-one with at least one light-emitting crystal and is coaxially arranged.

[0008] As one possible implementation, the lighting module further includes a second collimation module, which is disposed between the first collimation module and the light-diffusing element. The second collimation module includes at least one second collimation lens, and the at least one second collimation lens corresponds one-to-one with at least one of the light-emitting crystals and is coaxially arranged.

[0009] In one possible implementation, a microstructure is provided on the light-incident surface of the second collimating lens. A portion of the light beam emitted from the light-exiting surface of the first collimating lens is incident on the second collimating lens from the light-incident surface of the second collimating lens and reflected by the microstructure, and then emitted from the light-exiting surface of the second collimating lens to the light-uniforming element.

[0010] As one possible implementation, the light source includes at least one red light source, at least one green light source, and at least one blue light source, wherein the optical axes of at least one of the red light sources, at least one of the green light sources, and at least one of the blue light sources are parallel.

[0011] As one possible implementation, the lighting module further includes a relay mirror located between the light-diffusing element and the beam-splitting prism.

[0012] In one possible implementation, the projection lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first collimation module, the light-diffusing element, the relay mirror, the beam splitter, the first lens, and the second lens are arranged sequentially along a first direction. The third lens, the beam splitter, the fourth lens, the fifth lens, and the LCOS device are arranged sequentially along a second direction. A reflective film is provided on the side of the third lens away from the beam splitter. The first direction is perpendicular to the second direction.

[0013] In one possible implementation, a first absorptive polarizing element is disposed between the relay mirror and the beam splitter prism, a second absorptive polarizing element and a first phase delay plate are disposed sequentially between the beam splitter prism and the first lens, and a second phase delay plate is disposed between the third lens and the beam splitter prism.

[0014] In one possible implementation, the first absorptive polarizing element, the beam splitter, the second absorptive polarizing element, the first phase delay plate, the first lens, and the second lens are sequentially cemented together, and the third lens, the second phase delay plate, the beam splitter, the fourth lens, and the fifth lens are sequentially cemented together to form an integral structure.

[0015] In one possible implementation, the beam splitter is a PBS prism, which includes two triangular prisms and a reflective polarizing element. The bottom surfaces of the two triangular prisms are bonded together, and the reflective polarizing element is located between the two triangular prisms.

[0016] A second aspect of this application provides an AR device including the aforementioned LCOS optical system. This LCOS optical system can reduce the illumination space, contributing to the miniaturization of both the LCOS optical system and the AR device.

[0017] The beneficial effects of the embodiments of this application include:

[0018] The LCOS optical system 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 first collimation module, and a light-uniforming element. The imaging module includes a beam splitter, an LCOS device, and a projection lens. The first collimation module, the light-uniforming element, and the beam splitter are arranged sequentially along the light-emitting direction of the light source. The light beam emitted from the light source is collimated by the first collimation module and uniformized by the light-uniforming element, and then enters the beam splitter. After passing through the beam splitter, it enters the LCOS device. The LCOS device modulates the light beam into image light carrying image information and transmits it to the projection lens after passing through the beam splitter, so as to project the image light into an image through the projection lens. The LCOS optical system provided in this application can compress the thickness of the lighting module by coaxially and compactly arranging the light source, the first collimation module and the light homogenizing element. The first collimation module collimates the light beam emitted from the light source, and the light homogenizing element homogenizes the light beam, converges and redistributes the light beam, thereby improving the light efficiency and adjusting the angle distribution of the light. This can significantly improve the light energy utilization of the lighting module and is suitable for AR display in outdoor strong light environments. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is one of the structural schematic diagrams of the lighting module provided in the first embodiment of this application;

[0021] Figure 2 This is a second schematic diagram of the structure of the lighting module provided in the first embodiment of this application;

[0022] Figure 3 This is one of the structural schematic diagrams of the lighting module provided in the second embodiment of this application;

[0023] Figure 4 This is a second schematic diagram of the structure of the lighting module provided in the second embodiment of this application;

[0024] Figure 5 This is a schematic diagram of the structure of the lighting module provided in the third embodiment of this application;

[0025] Figure 6 for Figure 5 A schematic diagram of the structure of the second collimation module;

[0026] Figure 7 This is a schematic diagram of the LCOS optical system provided in an embodiment of this application.

[0027] Icons: 10-Light source; 100-Light-emitting crystal; 101-Red light source; 102-Green light source; 103-Blue light source; 21-First collimation module; 211-First collimating lens; 22-Second collimation module; 221-Second collimating lens; 2211-Incident surface of the second collimating lens; 2212-Outcrow surface of the second collimating lens; 2213-Microstructure; 30-Beam homogenizer; 40-Relay mirror; 50-Beam splitter prism; 51-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 delay waveplate; 84-Second phase delay waveplate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "horizontal," "vertical," etc., do not indicate that the component must be absolutely horizontal or suspended, but can be slightly tilted. The terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Existing LCOS lighting schemes typically employ two LED light sources: one is a green LED, and the other is a combined red and blue LED. The angle between the green collimated light path and the red-blue collimated light path is usually between 90° and 120°. This allows RGB light to be easily combined and emitted through a color-combining mirror, and then distributed through a compound eye lens for subsequent optical transmission. This is a fairly standard LCOS lighting scheme. However, because existing LCOS lighting schemes involve two collimating modules and a color-combining mirror, the overall lighting structure tends to be large and irregularly shaped, hindering the stacking of the optomechanical structure and resulting in significant wasted space.

[0032] To solve the above problems, please refer to the following: Figures 1 to 7This application provides an LCOS optical system, including 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 first collimation module 21, and a light-diffusing element 30. The imaging module includes a beam splitter 50, an LCOS device 60, and a projection lens. The first collimation module 21, the light-diffusing element 30, and the beam splitter 50 are arranged sequentially along the light-emitting direction of the light source 10. The light beam emitted from the light source 10 is collimated by the first collimation module 21 and diffused by the light-diffusing element 30 before entering the beam splitter 50. After passing through the beam splitter 50, it enters the LCOS device 60. The LCOS device 60 modulates the light beam into image light carrying image information, which is then transmitted to the projection lens after passing through the beam splitter 50, so that the image light is projected and imaged through the projection lens. This LCOS optical system can reduce the illumination space, which helps to realize the miniaturization of LCOS optical systems and AR devices.

[0033] It should be noted that, as Figure 7 As shown, the LCOS optical system includes an illumination module and an imaging module. The illumination module provides illumination for the LCOS optical system, and the imaging module projects and images the light beam emitted from the illumination module, thereby meeting the usage requirements of AR devices.

[0034] Specifically, such as Figures 1 to 6 As shown, the illumination module includes at least a light source 10, a first collimation module 21, and a light homogenizing element 30. The light source 10 is used to emit an initial beam of light, which can be an LED, laser, or miniature xenon lamp, etc., to provide the light energy required for imaging. The first collimation module 21 is located on the light-emitting side of the light source 10 and can be composed of a lens (such as an aspherical lens) or a mirror to convert the diverging initial beam into a parallel beam and reduce light energy divergence loss. The light homogenizing element 30 is located on the light-emitting side of the first collimation module 21 and can be a compound eye lens, an integrating bar, or a microlens array. The function of the light homogenizing element 30 is to homogenize the light intensity distribution of the parallel beam, avoid uneven brightness in the projected image, and provide high-quality illumination for subsequent imaging.

[0035] like Figure 7 As shown, the imaging module includes a beam splitter 50, located on the light-emitting side of the homogenizing element 30. After a parallel beam is incident, a portion of the beam is reflected to the LCOS device 60. The beam splitter 50 can be a PBS prism, which includes two triangular prisms 51. The bases of the two triangular prisms 51 are isosceles right triangles. During manufacturing, the bases of the two triangular prisms 51 can be glued together to split the incident unpolarized light into two perpendicular linearly polarized beams. These two perpendicular linearly polarized beams are P-polarized light and S-polarized light, respectively. The P-polarized light passes completely through the PBS prism, while the S-polarized light is reflected at a 45° angle, with its exit direction forming a 90° angle with the P-polarized light.

[0036] like Figure 7 As shown, the PBS prism also includes a reflective polarizing element 52, which is located between the two prisms 51. For example, the reflective polarizing element 52 is a reflective polarizer, or it is a polarizing beam splitter film deposited on the bottom surface of one of the prisms 51. The imaging module also includes an LCOS device 60 and a projection lens. The LCOS device 60 is disposed on one side of the beam splitter prism 50. The LCOS device 60 is used to control the deflection of pixel units via an electrical signal, modulating the light beam emitted from the beam splitter prism 50 into image light carrying image information, which is then transmitted to the projection lens after passing through the beam splitter prism 50. The projection lens is used to project and image the modulated image light.

[0037] Compared to existing technologies, the LCOS optical system provided in this application can compress the thickness of the lighting module by coaxially and compactly arranging the light source 10, the first collimation module 21, and the light homogenizing element 30. Furthermore, the first collimation module 21 collimates the light beam emitted from the light source 10, and the light homogenizing element 30 performs light homogenization processing on the light beam, converging and redistributing the light beam, thereby improving the light efficiency and adjusting the angle distribution of the light. This can significantly improve the light energy utilization rate of the lighting module and is suitable for AR displays in outdoor strong light environments.

[0038] As one possible implementation method, such as Figures 1 to 4 As shown, the light source 10 includes at least one light-emitting crystal 100, and the first collimation module 21 includes at least one first collimating lens 211. The at least one first collimating lens 211 corresponds one-to-one with the at least one light-emitting crystal 100 and is coaxially arranged.

[0039] It should be noted that the light source 10 includes at least one light-emitting crystal 100 (such as a laser diode, a vertical-cavity surface-emitting laser, or an LED chip), and each light-emitting crystal 100 emits a beam independently. The number of first collimating lenses 211 (such as aspherical lenses or cylindrical lenses) in the first collimation module 21 is equal to the number of light-emitting crystals 100, and they are coaxially arranged in a one-to-one correspondence. In other words, the optical axis of each light-emitting crystal 100 completely coincides with the optical axis of the corresponding first collimating lens 211, forming an independent optical unit of "light-emitting crystal 100 and first collimating lens 211". For example, when three RGB light-emitting crystals 100 are used, three coaxial first collimating lenses 211 are correspondingly arranged to collimate red light, green light, and blue light respectively.

[0040] The diverging beam emitted by the light-emitting crystal 100 (such as the divergence angle of a laser diode reaching 30°) is directly incident on the coaxial first collimating lens 211. The center of curvature of the first collimating lens 211 is coaxial with the light-emitting point of the light-emitting crystal 100, ensuring that the beam is collimated into parallel light along the optical axis. This point-to-point coaxial design avoids beam cross-interference after mixing of multiple light sources, and allows the beam of each color channel to be collimated independently, providing pure monochromatic parallel light for subsequent homogenization and imaging.

[0041] As one possible implementation method, such as Figures 1 to 4 As shown, the lighting module also includes a second collimation module 22, which is disposed between the first collimation module 21 and the light-diffusing element 30. The second collimation module 22 includes at least one second collimation lens 221, which corresponds to at least one light-emitting crystal 100 and is coaxially arranged.

[0042] It should be noted that the second collimation module 22 is disposed between the first collimation lens 211 and the light-diffusing element 30, and includes a number of second collimation lenses 221 equal to the number of light-emitting crystals 100. Each second collimation lens 221 is coaxially arranged in a one-to-one correspondence with the corresponding light-emitting crystal 100. For example, in an RGB three-channel system, after the three first collimation lenses 211 of the first collimation module 21 perform initial collimation on the red, green, and blue light respectively, the three second collimation lenses 221 of the second collimation module 22 perform secondary collimation on the beams of each channel, forming a two-stage optical path structure of "primary collimation and secondary collimation".

[0043] The light beam emitted by the light-emitting crystal 100 is initially collimated by the first collimating lens 211 (e.g., reducing the divergence angle from 30° to 10°), and then incident on the coaxial second collimating lens 221. The second collimating lens 221 performs fine correction on the residual divergence angle after collimation by the first collimating lens 211 (e.g., angular difference caused by the difference in refractive index of different wavelengths of light), ultimately compressing the beam divergence angle to within 0.5°. This dual-stage coaxial design achieves a step-by-step improvement in beam quality through the graded processing of "coarse collimation and precise collimation".

[0044] As one possible implementation method, such as Figure 5 and Figure 6 As shown, a microstructure 2213 is provided on the light-incident surface 2211 of the second collimating lens. Part of the light beam emitted from the light-exiting surface of the first collimating lens 211 is incident on the second collimating lens 221 from the light-incident surface 2211 and reflected by the microstructure 2213, and then emitted from the light-exiting surface 2212 of the second collimating lens to the light-uniforming element 30.

[0045] It should be noted that a microstructure 2213 (such as a microprism array, a reflective grating, or a microlens array) is fabricated on the incident surface 2211 of the second collimating lens. In the parallel beam emitted from the first collimating lens 211, a portion of the beam from the edge region (such as rays with an off-axis angle > 1°) is reflected at a specific angle by its reflecting surface when it is incident on the microstructure 2213, thus changing the direction of the light path; while a portion of the beam from the central region passes directly through the second collimating lens 221. For example, the microstructure 2213 is designed as an inclined surface with an inclination angle of 10° to 30°, which can totally reflect the edge beam and then converge it with a portion of the beam from the central region before it is incident on the homogenizing element 30.

[0046] The light beam emitted from the first collimating lens 211 exhibits edge divergence (e.g., edge light with an off-axis angle > 1.5°). In conventional designs, this portion of the light is lost because it exceeds the receiving angle of the homogenizing element 30. The microstructure 2213 reflects a portion of the light beam from the edge region, deflecting it into the effective receiving range of the homogenizing element 30 (e.g., ±0.8°), forming a composite optical path of "center transmission and edge reflection." This allows the previously lost edge light energy to be reused, improving overall energy efficiency.

[0047] As one possible implementation method, such as Figure 2 and Figure 3 As shown, 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, with the optical axes of the at least one red light source 101, at least one green light source 102, and at least one blue light source 103 being parallel. The parallel optical axes ensure that the three primary color beams maintain a relatively fixed spatial position throughout the collimation, homogenization, and imaging processes. After processing by the first collimation module 21 and the second collimation module 22, the three parallel beams are incident on the homogenizing element 30 at the same angle and remain parallel and superimposed at the beam splitter prism 50, ultimately forming a precisely overlapping RGB three-color light field on the surface of the LCOS device 60, laying the foundation for full-color imaging.

[0048] The shape of the light-emitting crystal 100 of the aforementioned light source 10 can be circular or any polygon, for example, Figure 2 The shape of the light-emitting crystal 100 is polygonal. Figure 3 The light-emitting crystal 100 is circular in shape; the spacing between two adjacent optical axes is typically 1 mm to 5 mm, for example, Figure 2 The spacing between the light-emitting crystals 100 is relatively small. Figure 3The spacing between the light-emitting crystals 100 is relatively large. When the spacing between the light-emitting crystals 100 is relatively large, the mutual interference between the first collimation module 21 and the second collimation module 22 can be reduced. This reduces the probability to a certain extent that the edge beam emitted from the light-emitting surface of a certain first collimation lens 211 will be incident into the second collimation lens 221 which is not on the same axis and eventually be emitted. This further optimizes the collimation rate of the first collimation module 21 and the second collimation module 22.

[0049] As one possible implementation method, such as Figure 7 As shown, the illumination module also includes a repeater mirror 40, which is located between the homogenizing element 30 and the beam splitter 50. The repeater mirror 40 further shapes the light beam, resulting in a more uniform output beam and thus improving the projection imaging quality. This makes the illumination module of the LCOS optical system more stable and produces better results.

[0050] As one possible implementation method, such as Figure 7 As shown, 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. 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-shaped structure. Regarding the specific selection of the projection lens, those skilled in the art should be able to make reasonable selections and designs based on actual conditions; no specific limitations are imposed here.

[0051] As one possible implementation method, such as Figure 7 As shown, the first collimation module 21, the second collimation module 22, the homogenizing element 30, the repeater mirror 40, the beam splitter 50, the first lens 71, and the second lens 72 are arranged sequentially along the first direction. The third lens 73, the beam splitter 50, the fourth lens 74, the fifth lens 75, and the LCOS device 60 are arranged sequentially along the second direction. A reflective film 731 is provided on the side of the third lens 73 away from the beam splitter 50. The first direction is perpendicular to the second direction, so that the layout structure of the LCOS optical system is more reasonable and can make effective use of space, which is conducive to the miniaturization of the LCOS optical system. Regarding the layout of the LCOS optical system, those skilled in the art should be able to make reasonable selections and designs according to the actual situation, and no specific restrictions are made here.

[0052] To further improve image contrast, as one possible implementation method is... Figure 7As shown, a first absorptive polarizing element 81 is disposed between the relay mirror 40 and the beam splitter 50 to absorb stray light from the AR surface. A second absorptive polarizing element 82 and a first phase delay plate 83 are disposed sequentially between the beam splitter 50 and the first lens 71 to absorb the leakage light from the reflective polarizing element 52 and the stray light reflected back into the beam splitter 50 from the second lens 72. A second phase delay plate 84 is disposed between the third lens 73 and the beam splitter 50 to compensate for the optical polarization degree reflected back from the LCOS device 60.

[0053] As one possible implementation method, such as Figure 7 As shown, the first absorptive polarizing element 81, the beam splitter 50, the second absorptive polarizing element 82, the first phase delay plate 83, the first lens 71 and the second lens 72 are sequentially cemented together, and the third lens 73, the second phase delay plate 84, the beam splitter 50, the fourth lens 74 and the fifth lens 75 are sequentially cemented together to form an integral structure, thereby reducing Fresnel stray light and further improving imaging contrast.

[0054] This application also provides an AR device including the aforementioned LCOS optical system. Since the structure and beneficial effects of the LCOS optical system have been described in detail in the foregoing embodiments, they will not be repeated here.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0056] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

Claims

1. An LCOS optical system, characterized in that, The system 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 first collimation module, and a light-uniforming element. The imaging module includes a beam splitter, an LCOS device, and a projection lens. The first collimation module, the light-uniforming element, and the beam splitter are arranged sequentially along the light-emitting direction of the light source. The light beam emitted from the light source is collimated by the first collimation module and uniformized by the light-uniforming element before entering the beam splitter. After passing through the beam splitter, it enters the LCOS device. The LCOS device modulates the light beam into image light carrying image information and transmits it to the projection lens after passing through the beam splitter, 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 light source includes at least one light-emitting crystal, and the first collimation module includes at least one first collimating lens. The at least one first collimating lens corresponds one-to-one with the at least one light-emitting crystal and is coaxially arranged.

3. The LCOS optical system according to claim 2, characterized in that, The lighting module further includes a second collimation module, which is disposed between the first collimation module and the light-diffusing element. The second collimation module includes at least one second collimation lens, and the at least one second collimation lens corresponds one-to-one with at least one of the light-emitting crystals and is coaxially arranged.

4. The LCOS optical system according to claim 3, characterized in that, The light-incident surface of the second collimating lens is provided with a microstructure. A portion of the light beam emitted from the light-exiting surface of the first collimating lens is incident on the second collimating lens from the light-incident surface of the second collimating lens and reflected by the microstructure, and then emitted from the light-exiting surface of the second collimating lens to the light-uniforming element.

5. The LCOS optical system according to claim 1, characterized in that, The light source includes at least one red light source, at least one green light source, and at least one blue light source, and the optical axes of at least one of the red light sources, at least one of the green light sources, and at least one of the blue light sources are parallel.

6. The LCOS optical system according to claim 1, characterized in that, The lighting module also includes a relay mirror, which is located between the light-diffusing element and the beam-splitting prism.

7. The LCOS optical system according to claim 6, characterized in that, The projection lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first collimation module, the light-diffusing element, the relay mirror, the beam splitter, the first lens, and the second lens are arranged sequentially along a first direction. The third lens, the beam splitter, the fourth lens, the fifth lens, and the LCOS device are arranged sequentially along a second direction. The third lens has a reflective film on the side away from the beam splitter. The first direction is perpendicular to the second direction.

8. The LCOS optical system according to claim 7, characterized in that, A first absorptive polarizing element is disposed between the relay mirror and the beam splitter prism. A second absorptive polarizing element and a first phase delay plate are disposed sequentially between the beam splitter prism and the first lens. A second phase delay plate is disposed between the third lens and the beam splitter prism.

9. The LCOS optical system according to claim 8, characterized in that, The first absorptive polarizing element, the beam splitter, the second absorptive polarizing element, the first phase delay plate, the first lens, and the second lens are sequentially cemented together, and the third lens, the second phase delay plate, the beam splitter, the fourth lens, and the fifth lens are sequentially cemented together to form an integral structure.

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

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

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