Optical system and projection equipment

Abstract

The embodiment of the utility model discloses an optical system and projection equipment, which can effectively reduce the interference phenomenon caused by the linearly polarized light characteristic of laser by performing spatial coherence suppression on a laser beam which is emitted by a laser module and has a first polarization state through a moving light homogenizing device. Therefore, speckles in the projection picture are reduced, and the quality and the visual effect of the projection picture are improved. Meanwhile, when the light homogenizing device rotates, the intersection point of the optical axis of the laser beam and the surface of the light homogenizing device and the center point of the rotating shaft of the light homogenizing device are not coaxial, the modulation effect on the laser beam is further enhanced, the coherence of the laser can be more fully damaged, and generation of speckles is further restrained. According to the technical scheme, by reasonably configuring the laser module, the light homogenizing device, the silicon-based liquid crystal module and the imaging assembly, the problems of speckles and the like are solved, and meanwhile miniaturization and cost optimization of the system can be possibly achieved.

Description

Technical Field

[0001] This utility model relates to the field of projection technology, and in particular to an optical system and projection device. Background Technology

[0002] Liquid crystal on silicon (LCOS) panels use a CMOS chip as the circuit substrate and reflective layer. Liquid crystal is injected between the CMOS integrated circuit chip and the transparent glass substrate. The CMOS chip is polished and then used as a mirror. Light passes through the glass substrate and the liquid crystal material, and after dimming, it is reflected from the chip surface.

[0003] In the LCOS projection architecture, the illumination light is incident with a single polarization state. Specifically, the illumination system is incident on the LCOS panel at an angle of incidence (AOI) of 0°, a unique design that allows for miniaturization of the entire projection system. Simultaneously, to reduce costs while ensuring projection performance, the optical system design can reduce the number of components. However, due to the inherent characteristics of LCOS, its optical system is a polarized light source system, resulting in significant coherence issues and consequently, severe speckle problems in LCOS projection systems. Utility Model Content

[0004] An embodiment of this utility model provides an optical system and a projection device.

[0005] The technical solution of this utility model is implemented as follows:

[0006] In a first aspect, embodiments of the present invention provide an optical system, comprising: a laser module, an optical homogenization device, a silicon-based liquid crystal module, and an imaging component; wherein...

[0007] The optical homogenization device performs spatial coherence suppression and homogenization on the first polarization state laser beam emitted by the laser module through motion;

[0008] In the case of the optical homogenizing device moving, the laser beam is incident on the optical homogenizing device, and the intersection of the optical axis of the laser beam and the surface of the optical homogenizing device is not coaxial with the center point of motion of the optical homogenizing device.

[0009] The silicon-based liquid crystal module is used to receive and modulate the laser beam in the first polarization state after passing through the light homogenization device, and to emit image light to the imaging component;

[0010] An imaging component used to display projected images by transmitting image light.

[0011] In the above scheme, the light homogenization device includes a frame supporting the compound eye element, a bearing, and a drive assembly; wherein, the bearing is set on the rotation axis or extension line of the frame, the bearing is connected to the frame, and the drive assembly drives the bearing to move, thereby driving the frame to move.

[0012] In the above scheme, when the light homogenizing device rotates around its own diagonal as the axis of rotation, the intersection point is located on the diagonal.

[0013] In the above scheme, the optical system further includes: a diffusion device, and / or, a first lens; wherein,

[0014] The diffusion device is located between the laser module and the optical homogenization device. The diffusion device is used to suppress the spatial coherence of the laser beam in the first polarization state.

[0015] The first lens is located between the diffusion device and the light homogenizing device, or between the light homogenizing device and the silicon-based liquid crystal module, and the center of the first lens has a lateral displacement relative to the optical axis of the laser beam.

[0016] In the above scheme, the laser module and the diffusion device are relatively inclined, and the first lens is placed horizontally; or, the laser module and the diffusion device are relatively parallel, and the first lens is placed at an angle.

[0017] In the above scheme, the relative tilt between the laser module and the diffusion device includes any one of the following:

[0018] The laser module is placed horizontally, while the diffusion device is placed at an angle.

[0019] The laser module is placed at an angle, while the diffusion device is placed horizontally.

[0020] The laser module and diffusion device are both placed at an angle and are not parallel.

[0021] In the above scheme, the relative parallelism between the laser module and the diffusion device includes: both the laser module and the diffusion device are placed horizontally.

[0022] In the above scheme, the laser module includes at least some of the following: a laser source, a polarization conversion element, and a beam splitter.

[0023] A laser source for generating a laser beam with a first polarization state and / or a second polarization state;

[0024] A polarization conversion element is used to convert the polarization state of a laser beam in a second polarization state to obtain a laser beam in a first polarization state.

[0025] A beam splitter is used to transmit a partially polarized laser beam and reflect the remaining partially polarized laser beam.

[0026] In the above scheme, the silicon-based liquid crystal module includes: a polarization separation element, a compensation element, a silicon-based liquid crystal LCOS chip, and a polarization analyzer.

[0027] A polarization separation element is used to transmit a laser beam of the first polarization state and reflect a laser beam of the second polarization state.

[0028] Compensation elements are used to eliminate residual delays in polarization conversion of the laser beam in the LCOS chip.

[0029] An LCOS chip is used to polarize a laser beam in a first polarization state and reflect a laser beam in a second polarization state.

[0030] A polarizer is used to transmit a laser beam with a second polarization state and to absorb or reflect a laser beam with a first polarization state.

[0031] In the above scheme, the optical system also includes:

[0032] The first reflecting element is used to reflect the laser beam emitted from the light homogenizing device;

[0033] A beam homogenization module is used to homogenize the laser beam emitted from the first reflective element.

[0034] The second reflective element is used to reflect the laser beam emitted from the uniform light module and direct it onto the silicon-based liquid crystal module.

[0035] In the above scheme, the homogenizing module includes: a collimating lens and a compound eye lens, wherein,

[0036] A collimating lens is used to collimate a laser beam.

[0037] Compound eye lenses are used to homogenize laser beams after they have passed through collimating lenses.

[0038] Secondly, embodiments of the present invention provide a projection device, which includes the optical system described in any of the first aspects above.

[0039] This utility model provides an optical system and projection device, including: a laser module, a light homogenizing device, a silicon-based liquid crystal module, and an imaging component. The light homogenizing device performs spatial coherence suppression and homogenization on a laser beam of a first polarization state emitted by the laser module through motion. When the light homogenizing device rotates, the laser beam incident on the device is non-coaxial with the intersection point of the laser beam's optical axis and the surface of the device. The silicon-based liquid crystal module receives and modulates the laser beam of the first polarization state after passing through the light homogenizing device and emits image light to the imaging component. The imaging component transmits the image light to display the projected image. Thus, by using a moving light homogenizing device to suppress the spatial coherence of the laser beam of the first polarization state emitted by the laser module, interference caused by the linear polarization characteristics of the laser light can be effectively reduced, thereby reducing speckle in the projected image and improving the quality and visual effect of the projected image. Meanwhile, during the rotation of the optical homogenizer, the intersection point of the laser beam's optical axis with the surface of the homogenizer and the center point of the homogenizer's rotation axis are not coaxial, further enhancing the modulation effect on the laser beam. This facilitates more thorough disruption of laser coherence and further suppresses speckle formation. This technical solution, through the rational configuration of the laser module, optical homogenizer, silicon-based liquid crystal module, and imaging components, can solve problems such as speckle while potentially achieving system miniaturization and cost optimization. Attached Figure Description

[0040] Figure 1 A schematic diagram of an optional optical system provided for an embodiment of this utility model. Figure 1 ;

[0041] Figure 2 A schematic diagram of an optional optical system provided for an embodiment of this utility model. Figure 2 ;

[0042] Figure 3 A schematic diagram of an optional optical system provided for an embodiment of this utility model. Figure 3 ;

[0043] Figure 4 A schematic diagram of an optional optical system provided for an embodiment of this utility model. Figure 4 ;

[0044] Figure 5 A schematic diagram of an optional optical system provided for an embodiment of this utility model. Figure 5 ;

[0045] Figure 6 A schematic diagram of an optional optical architecture provided for an embodiment of this utility model;

[0046] Figure 7This is a schematic diagram of an optional projection device provided for an embodiment of the present utility model. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0049] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0050] This utility model embodiment provides an optical system, see [link]. Figure 1 , Figure 1 The diagram shown is a structural schematic of an optical system 100, which includes: a laser module 1, a light homogenization device 2, a silicon-based liquid crystal module 3, and an imaging component 4; wherein,

[0051] The light homogenization device 2 performs spatial coherence suppression and light homogenization on the first polarization state laser beam emitted by the laser module 1 through movement;

[0052] In the case where the light homogenizing device 2 is in motion, the laser beam is incident on the light homogenizing device 2, and the intersection of the optical axis of the laser beam and the surface of the light homogenizing device 2 is not coaxial with the center point of motion of the light homogenizing device 2.

[0053] The silicon-based liquid crystal module 3 is used to receive and modulate the laser beam of the first polarization state after passing through the light homogenization device 2, and to emit image light to the imaging component 4.

[0054] Imaging component 4 is used to display the projected image by transmitting image light.

[0055] In this embodiment of the invention, the laser module is used to emit narrow-spectrum light, which includes at least one or more laser beams with partially overlapping and / or non-overlapping wavelength ranges, such as a blue laser beam, a red laser beam, or a green laser beam.

[0056] In this embodiment of the invention, the laser beam generated by the laser module has a first polarization state. Here, the first polarization state can be a P-state or an S-state.

[0057] In this embodiment of the invention, the light homogenization device is located on the optical path of the laser beam in the first polarization state emitted by the laser module. The light homogenization device can homogenize the laser beam in the first polarization state. The homogenization process can make the light intensity distribution of the laser beam in space more uniform, providing a more stable and uniform light source foundation for subsequent imaging, which is beneficial to improving the brightness uniformity and visual effect of the projected image. Of course, the light homogenization device can also suppress the spatial coherence of the laser beam in the first polarization state by its own movement.

[0058] It should be noted that the spatial coherence of a laser beam refers to the irregular intensity distribution and randomly distributed spots that occur when light is reflected from a rough surface or backscattered or transmitted from the interior of a medium containing scattering material. More specifically, this is due to the interference phenomenon that occurs when reflected or scattered light waves meet in space, that is, speckle formation occurs when light propagates through the scattering medium and free space.

[0059] It can be understood that the optical homogenizing device, through its own movement, causes the laser beam of the first polarization state to shift in the emission direction, reducing the amount of light per unit space and correspondingly reducing the interference between the light beams, thereby suppressing the spatial coherence of the laser beam and reducing speckle.

[0060] Here, the motion of the light homogenizing device includes, but is not limited to, rotation and translation of the light homogenizing device. Rotation includes flipping rotation and rotational rotation. When rotating, the light homogenizing device can rotate around its own characteristic axis as the axis of rotation. Its own characteristic axis includes, but is not limited to, one or more of the diagonal, the long side or the median of the short side.

[0061] In this embodiment of the invention, during the movement of the optical homogenizing device, the intersection point of the optical axis of the laser beam when it is incident on the surface of the optical homogenizing device can be set to be non-coaxial with the center point of the movement of the optical homogenizing device, thereby further reducing speckle.

[0062] In some embodiments, the non-coaxiality between the optical axis of the laser beam and the surface of the optical homogenizing device and the center point of motion of the optical homogenizing device can include two cases:

[0063] In the first scenario, when the optical homogenizing device rotates, the intersection point of the laser beam's optical axis and the surface of the optical homogenizing device is not coaxial with the center point of the homogenizing device's rotation or flipping. For example, refer to... Figure 2 As shown, the intersection point A of the optical axis of the laser beam and the surface of the optical homogenizing device is offset from the center point B of the rotation or flipping of the optical homogenizing device by a certain offset distance, thus further reducing speckle.

[0064] In some embodiments, when the light homogenizing device rotates about its own diagonal as the axis of rotation, the intersection point is located on the diagonal.

[0065] Here, continue to refer to Figure 2 When the optical homogenizing device rotates around its own diagonal, the intersection point A of the optical axis of the laser beam and the surface of the optical homogenizing device is located on the diagonal RL. The intersection point A is offset from the center point B of the rotation of the optical homogenizing device by a certain offset distance, thus further reducing speckle.

[0066] The second method involves the laser beam's optical axis intersecting the surface of the optical homogenizer when the homogenizer is in translational motion. The intersection point of the laser beam's optical axis and the surface of the optical homogenizer is not coaxial with the center point of the optical homogenizer. In other words, the intersection point of the laser beam's optical axis and the surface of the optical homogenizer is offset relative to the center point of the optical homogenizer by a certain offset distance, thereby further reducing speckle.

[0067] In practical applications, the light homogenization device can be a light-combining compound eye, which can be a single-sided light-combining compound eye or a double-sided light-combining compound eye. This utility model does not impose any specific limitations on this.

[0068] In this optical homogenization device, when the single-sided optical compound eye is used, each sub-eye modulates and segments the laser beam to varying degrees during its movement. After passing through the sub-eyes, the optical path and phase of different parts of the beam change, causing the originally highly spatially coherent laser beam to lose coherence to some extent, resulting in a non-uniform intensity distribution and thus partially suppressing spatial coherence. It should also be noted that the single-sided optical compound eye structure is relatively simple, making it highly practical in situations where spatial coherence suppression requirements are not particularly high, or where system space and cost are limited. Furthermore, it is easily integrated into various optical systems.

[0069] In the case of a double-sided optical homogenizing device, the laser beam undergoes two modulation processes during its movement. The beam first passes through one optical homogenizing eye, where it is split and modulated, and then passes through the other for a second split and modulation. This method results in richer variations in the optical path difference and a more complex spatial distribution, effectively disrupting the spatial coherence of the laser beam. Compared to a single-sided optical homogenizing eye, it exhibits a more significant suppression effect on spatial coherence. Furthermore, the double modulation by the double-sided optical homogenizing eye leads to a more uniform spatial distribution of the laser beam. The inhomogeneity generated during the first pass is further corrected and compensated for during the second pass, resulting in a more uniform intensity distribution across the entire cross-section. Simultaneously, the relatively complex structure and modulation process of the double-sided optical homogenizing eye contribute to a more stable suppression effect on the spatial coherence of the laser beam. Even if external conditions such as vibration and temperature change, the system can still maintain a good inhibition effect due to the synergistic effect of the two combined eyes, reducing the fluctuation of inhibition effect caused by external factors.

[0070] In this embodiment of the present invention, the silicon-based liquid crystal module receives and modulates a laser beam of the first polarization state after passing through the light homogenization device, and emits image light to the imaging component.

[0071] In this embodiment of the invention, the imaging component is used to transmit image light to display the projected image, and the imaging component may be a lens.

[0072] In one possible implementation, a laser beam of the first polarization state emitted from a laser module illuminates a light homogenizing device. The light homogenizing device homogenizes the laser beam of the first polarization state. Simultaneously, due to the movement of the light homogenizing device, the intersection point of the optical axis of the laser beam with the surface of the light homogenizing device is not coaxial with the center point of motion of the light homogenizing device. Therefore, the light homogenizing device can also suppress the spatial coherence of the laser beam of the first polarization state. Further, the laser beam, after spatial coherence suppression and homogenization, illuminates a silicon-based liquid crystal module. The silicon-based liquid crystal module modulates the laser beam of the first polarization state and emits image light to an imaging component. The imaging component transmits the image light and displays a projected image.

[0073] This invention provides an optical system comprising: a laser module, a light homogenizing device, a silicon-based liquid crystal module, and an imaging component. The light homogenizing device performs spatial coherence suppression and homogenization on a laser beam of a first polarization state emitted by the laser module through motion. When the light homogenizing device is in motion, the laser beam incident on the device is not coaxial with the intersection of the laser beam's optical axis and the surface of the device. The silicon-based liquid crystal module receives and modulates the laser beam of the first polarization state after passing through the light homogenizing device and emits image light to the imaging component. The imaging component transmits the image light to display a projected image. Thus, the light homogenizing device, through motion and with the laser beam's optical axis not coaxial with the center of motion, performs spatial coherence suppression and homogenization on the laser beam of the first polarization state emitted by the laser module, effectively suppressing spatial coherence, reducing interference phenomena such as laser speckle, and improving image quality. The silicon-based liquid crystal module can receive and modulate the laser beam after passing through the light homogenizing device, converting it into image light. Liquid crystal on silicon (LCD) technology can precisely modulate laser beams to present high-quality image content, meeting the requirements of different application scenarios for image clarity and color reproduction.

[0074] In some embodiments, continue to refer to Figure 2 The light homogenization device 2 includes a frame 21 that supports the compound eye element, a bearing 22, and a drive assembly 23; wherein the bearing 22 is disposed on the rotation axis or extension line of the frame 21, the bearing 22 is connected to the frame 21, and the drive assembly 23 drives the frame 21 to move by driving the bearing 22.

[0075] In this embodiment of the invention, the light homogenization device includes a frame supporting the compound eye element, a bearing, and a drive assembly.

[0076] The light homogenizing device is configured to rotate around a rotation axis RL, which can be the diagonal, horizontal, or vertical direction of the device. For example, the rotation axis RL can be along the diagonal of the frame, a line parallel to the long side of the frame, or a line parallel to the midline of the short side of the frame; this invention does not impose specific limitations in this regard. It should be noted that... Figure 2 The rotation axis RL shown is along the diagonal line, and the bearing is located along the diagonal line.

[0077] Here, the drive assembly includes a magnet located at the outer corner of the frame, a drive circuit, and a coil support corresponding to the magnet. The coil support is equipped with an electromagnetic coil. Figure 2 (Not shown in the image), the energization of the electromagnetic coil in the coil support section is controlled by the drive circuit.

[0078] The magnet can be a permanent magnet. The electromagnetic coil generates a magnetic force corresponding to the direction of the current applied to it by the driving circuit, which attracts or repels the corresponding magnet.

[0079] Thus, the bearing, positioned along or extending from the frame's rotation axis and connected to it, provides stable rotational support, ensuring the frame's smoothness during movement and contributing to improved uniformity and stability of light homogenization. The drive assembly, via the drive bearing, propels the frame's movement, efficiently transmitting driving force and enabling precise motion control. This facilitates accurate spatial coherence suppression and homogenization of the laser beam. This structural design results in a compact layout of the components of the light homogenization device, occupying minimal space and facilitating integration into the overall optical system, thereby enhancing the system's integration and compactness.

[0080] In some embodiments, to further reduce speckle, in Figure 1 Based on the left image in the middle, refer to Figure 3 As shown, the optical system 100 further includes: a diffusion device 5, and / or, a first lens 6; wherein,

[0081] The diffusion device 5 is located between the laser module 1 and the light homogenization device 2. The diffusion device 5 is used to suppress the spatial coherence of the laser beam in the first polarization state.

[0082] The first lens 6 is located between the diffusion device 5 and the light homogenizing device 2, or between the light homogenizing device 2 and the silicon-based liquid crystal module 3, and the center of the first lens 6 has a lateral displacement relative to the optical axis of the laser beam.

[0083] Understandable, Figure 1 Based on the right figure, the optical system also includes a diffusion device and a first lens with the same positional structure. Figure 3 Similarly, this will not be explained further here. It should be noted that the diagrams used subsequently can be... Figure 1 The left image in the diagram will be used as an example for illustration.

[0084] In this embodiment of the invention, the optical system may include only a diffusion device, or it may include only a first lens. Of course, the optical system may also include both a diffusion device and a first lens.

[0085] In this embodiment of the invention, the diffusion device is located on the optical path of the laser beam, such as between the laser module and the optical homogenization device. The diffusion device is used to diffuse the laser beam to suppress its spatial coherence. Here, the diffusion device can be a dynamic diffusion device, such as a dynamic diffusion sheet, or a static diffusion device, such as a static diffusion sheet.

[0086] In this embodiment of the invention, the first lens is located on the optical path of the laser beam. The first lens is used to focus or collimate the laser beam. The first lens may be positioned between the diffusion device and the light homogenizing device, such as... Figure 3 In the left image, the first lens can also be positioned between the light homogenizing device and the silicon-based liquid crystal module, such as... Figure 3 The right image in the text.

[0087] In this embodiment of the invention, the center of the first lens has a lateral displacement relative to the optical axis of the laser beam, which increases the modulation stage of the laser beam in the optical system. This, combined with the light homogenization device, suppresses spatial coherence and homogenizes the beam. The lateral displacement causes different parts of the beam to experience different optical path lengths and phase changes, further disrupting the spatial coherence of the beam. Simultaneously, working in conjunction with the light homogenization device, it improves the uniformity of the beam, reduces speckle and other defects, and enhances the quality of the projected image.

[0088] In one implementation, a laser beam of a first polarization state emitted from a laser module illuminates a diffusion device, which diffuses the laser beam to achieve a first spatial coherence suppression. Further, in one case, the laser beam after the first spatial coherence suppression illuminates a homogenizing device. Due to the movement of the homogenizing device, it can homogenize the laser beam of the first polarization state and perform a second spatial coherence suppression. Further, the laser beam after the second spatial coherence suppression illuminates a first lens for collimation or focusing, and then emits the processed laser beam. In another case, the laser beam after the first spatial coherence suppression illuminates a first lens for collimation or focusing, and then emits the processed laser beam to the homogenizing device. Due to the movement of the homogenizing device, it can homogenize the laser beam of the first polarization state and perform a second spatial coherence suppression. Furthermore, the laser beam, after undergoing a second spatial coherence suppression, irradiates the silicon-based liquid crystal module. The silicon-based liquid crystal module modulates the laser beam in the first polarization state and emits image light to the imaging component. The imaging component transmits the image light and displays the projected image.

[0089] In some embodiments, to increase the distance between the intersection point of the laser beam's optical axis and the surface of the optical homogenizing device and the center point of the optical homogenizing device in a preset direction, such as the diagonal direction, the long side direction, or the short side midline direction, this can be achieved by setting the positional relationship between the laser module, the diffusion device, and the first lens. (Refer to...) Figure 4 As shown, the laser module 1 and the diffusion device 5 are relatively inclined, and the first lens 6 is placed horizontally; or, the laser module 1 and the diffusion device 5 are relatively parallel, and the first lens 6 is placed at an angle.

[0090] In this embodiment of the invention, the positional relationship between the laser module and the diffusion device can be either relatively inclined or relatively parallel. When the positional relationship between the laser module and the diffusion device is relatively inclined, the first lens can be placed horizontally, such as... Figure 4 The top left, top right, and bottom left images are shown in the image.

[0091] Here, the relative tilt between the laser module and the diffusion device includes any one of the following: the laser module is placed horizontally, and the diffusion device is placed at an angle, such as... Figure 4 The top left image shows the laser module placed at an angle, while the diffusion device is placed horizontally. Figure 4 The upper right image shows that both the laser module and the diffusion device are tilted and not parallel, as shown in the image above. Figure 4 The bottom left image in the image.

[0092] In this embodiment of the invention, when the laser module and the diffusion device are relatively parallel, the first lens can be placed at an angle. Here, "relatively parallel" means that both the laser module and the diffusion device are placed horizontally. Figure 4 The bottom right image in the text.

[0093] It should be noted that the tilt angles of the laser module, the diffusion device, and the first lens can be set based on the tilt angle required for actual use, and this embodiment of the present invention will not elaborate on this.

[0094] In some embodiments, refer to Figure 5 As shown, the laser module 1 includes at least a portion of a laser source 11, a polarization conversion element 12, and a beam splitter 13, wherein...

[0095] Laser source 11, used to generate laser beams in a first polarization state and / or a second polarization state;

[0096] The polarization conversion element 12 is used to convert the polarization state of the laser beam in the second polarization state to obtain the laser beam in the first polarization state.

[0097] The beam splitter 13 is used to transmit a partially polarized laser beam and reflect the remaining partially polarized laser beam.

[0098] In this embodiment of the invention, the first polarization state can be a P state or an S state. When the first polarization state is a P state, the second polarization state is an S state; when the first polarization state is an S state, the second polarization state is a P state.

[0099] In this embodiment of the invention, the laser source may generate only a laser beam with a first polarization state, or it may generate only a laser beam with a second polarization state, or it may generate both a laser beam with a first polarization state and a laser beam with a second polarization state.

[0100] In this embodiment of the invention, the polarization conversion element is located on the optical path of at least part of the laser beam emitted from the laser source. The polarization conversion element can convert the polarization state of the laser beam in the second polarization state to obtain the laser beam in the first polarization state. The polarization conversion element can be a half-wave plate, also known as a 1 / 2 wave plate or λ / 2.

[0101] In this embodiment of the invention, the beam splitter is located in the optical path of the laser beam emitted from the laser source. The beam splitter can transmit a portion of the polarized laser beam and reflect the remaining portion of the polarized laser beam. In one exemplary embodiment, the beam splitter may include a first region and a second region. The first region is used to transmit a portion of the polarized laser beam, and the second region is used to reflect the remaining portion of the polarized laser beam. The first region includes, but is not limited to, a through-hole.

[0102] In this embodiment of the invention, the composition structure of the laser module includes the following cases, depending on the polarization state of the laser beam generated by the laser source.

[0103] The first method involves a laser source that generates only a laser beam with a first polarization state. The laser module consists of a laser source and a beam splitter. The first polarization laser beam emitted from the laser source illuminates the beam splitter, which transmits a portion of the polarized laser beam and reflects the remaining portion. This beam splitting reduces the power density of the illumination compound eye and achieves better brightness uniformity, while ensuring that the polarization state of the laser beam incident on the silicon-based liquid crystal module is the first polarization state, i.e., both beams are either in the P-state or both in the S-state.

[0104] The second method involves a laser source that generates only laser beams in a second polarization state. The laser module consists of a laser source, a polarization conversion element, and a beam splitter. All laser beams in the second polarization state emitted from the laser source are directed to the polarization conversion element (placed at the location where the polarization state of the laser beam needs to be changed). The polarization conversion element converts the second polarization state of the laser beams to a first polarization state. This first polarization state laser beam is then directed to the beam splitter, which transmits a portion of the polarized laser beam and reflects the remaining portion. This beam splitting reduces the power density of the illumination compound eye and achieves better brightness uniformity, while ensuring that the polarization state of the laser beams incident on the silicon-based liquid crystal module is the first polarization state, i.e., both are either P-state or both are S-state.

[0105] The third method involves a laser source generating laser beams with first and second polarization states. The laser module's structure includes a laser source, a polarization conversion element, and a beam splitter. The laser source emits laser beams with both first and second polarization states. All the second-polarization laser beams emitted from the laser source illuminate the polarization conversion element (i.e., the polarization conversion element is only placed at the location of the laser beam whose polarization state needs to be changed). The polarization conversion element converts the polarization state of the second-polarization laser beams to obtain a first-polarization laser beam. Further, the first-polarization laser beams emitted from the laser source and the first-polarization laser beams emitted from the polarization conversion element are incident on the beam splitter. The beam splitter transmits a portion of the polarized laser beams and reflects the remaining portion. This beam splitting of the light source reduces the power density of the illumination compound eye and achieves better brightness uniformity, while ensuring that the polarization state of the laser beams incident on the silicon-based liquid crystal module is the first polarization state, i.e., both are either P-state or both are S-state.

[0106] In some embodiments, continue to refer to Figure 1 As shown, the silicon-based liquid crystal module 3 includes: a polarization separation element 31, a compensation element 32, a silicon-based liquid crystal LCOS chip 33, and a polarization analyzer 34, wherein,

[0107] The polarization separation element 31 is used to transmit a laser beam of the first polarization state and reflect a laser beam of the second polarization state.

[0108] Compensation element 32 is used to eliminate the residual delay in polarization conversion of the laser beam in the LCOS chip;

[0109] The LCOS chip 33 is used to polarize the laser beam in the first polarization state and reflect the laser beam in the second polarization state.

[0110] The analyzer 34 is used to transmit a laser beam of the second polarization state and absorb or reflect a laser beam of the first polarization state.

[0111] In this embodiment of the invention, the polarization separating element can transmit a laser beam of a first polarization state and reflect a laser beam of a second polarization state. If the first polarization state is P-state, then the polarization separating element is a polarization separating element that transmits P-state and reflects S-state; if the first polarization state is S-state, then the polarization separating element is a polarization separating element that transmits S-state and reflects P-state. The polarization separating element can be one of a wire grid, a polarizing beam splitter (PBS), and a polarizer.

[0112] In this embodiment of the invention, the compensation element is located between the polarization separation element and the LCOS chip. The compensation element can eliminate the residual delay in polarization conversion of the laser beam in the LCOS chip, thereby improving the system contrast under low F-number illumination. Exemplarily, the compensation element can be a compensation sheet.

[0113] It should be noted that by setting a compensation element, the contrast ratio can reach approximately 7000:1. Here, contrast ratio can be understood as the ratio between white and dark areas; the lower the dark area ratio, the higher the contrast ratio. The compensation element, such as a compensation sheet, can be coated with A+C film layers. The A film layer can eliminate the residual delay in polarization light conversion caused by incomplete pretilt angle deflection of the liquid crystal, while the C film layer can compensate for the delay of large-angle light.

[0114] In this embodiment of the invention, the LCOS chip is placed in the optical path of the laser beam emitted from the compensation element, polarizes the laser beam in the first polarization state, and reflects the laser beam in the second polarization state.

[0115] In this embodiment of the invention, the analyzer is located in the optical path of the laser beam of the second polarization state emitted from the LCOS chip. The analyzer can transmit the laser beam of the second polarization state and absorb or reflect the laser beam of the first polarization state, thereby improving the contrast.

[0116] In one possible implementation, after a laser beam of the first polarization state illuminates the silicon-based liquid crystal module, the laser beam of the first polarization state is transmitted through a polarization separating element, then through a compensation element, and incident on the LCOS chip. The LCOS chip modulates the polarization of the laser beam of the first polarization state to obtain a laser beam of the second polarization state. The LCOS chip reflects the laser beam of the second polarization state and re-illuminates it onto the compensation element. The compensation element eliminates the residual delay in polarization conversion in the laser beam of the LCOS chip, and then the beam illuminates the polarization separating element again. The polarization separating element reflects the laser beam of the second polarization state to an analyzer. The analyzer absorbs or reflects the laser beam of the first polarization state and transmits the laser beam of the second polarization state to the imaging component. Thus, by adding a compensation element to the silicon-based liquid crystal module, with the compensation element located before the LCOS chip, the residual delay in polarization conversion in the laser beam of the LCOS chip is eliminated, thereby improving contrast.

[0117] In some embodiments, continue to refer to Figure 1 As shown in the left figure, the optical system 100 also includes:

[0118] The first reflective element 7 is used to reflect the laser beam emitted from the light homogenizing device 2;

[0119] The beam homogenization module 8 is used to homogenize the laser beam emitted from the first reflective element 7.

[0120] The second reflective element 9 is used to reflect the laser beam emitted from the uniform light module 8 and incident it onto the silicon-based liquid crystal module 3.

[0121] The homogenizing module 8 includes a collimating lens 81 and a compound eye lens 82, wherein...

[0122] Collimating lens 81 is used to collimate the laser beam;

[0123] The compound eye lens 82 is used to homogenize the laser beam that has passed through the collimating lens 81.

[0124] In this embodiment of the invention, the first reflecting element is located on the optical path of the laser beam emitted from the optical homogenizing device, and the first reflecting element can reflect the laser beam emitted from the optical homogenizing device. For example, the first reflecting element can be a mirror.

[0125] In this embodiment of the invention, the light-uniforming module is located between the first reflecting element and the second reflecting element. The light-uniforming module includes a collimating lens and a compound eye lens. The collimating lens can collimate the laser beam in the first polarization state. The collimating lens can be one of a spherical lens, an aspherical lens, a Fresnel lens, or a freeform lens. The compound eye lens can perform light-uniforming processing on the laser beam that has passed through the collimating lens. The compound eye lens can be a light-combining compound eye or a light-uniforming rod.

[0126] In this embodiment of the invention, the second reflective element is located on the optical path of the laser beam emitted from the homogenizing module, and the second reflective element can reflect the laser beam emitted from the homogenizing module. For example, the second reflective element can be a mirror.

[0127] In one possible implementation, a laser beam of the first polarization state emitted from a laser module illuminates a light homogenizing device. The light homogenizing device homogenizes the laser beam of the first polarization state. Simultaneously, due to the movement of the light homogenizing device, the intersection point of the laser beam's optical axis with the surface of the light homogenizing device is not coaxial with the center point of motion of the light homogenizing device. The light homogenizing device can also suppress the spatial coherence of the laser beam of the first polarization state. Further, the laser beam, after spatial coherence suppression and homogenization, illuminates a first reflecting element. Reflected by the first reflecting element, it is incident on a collimating lens. The collimating lens converges the diverging laser beam of the first polarization state into a parallel beam. A compound eye lens homogenizes the parallel beam emitted from the collimating lens and then illuminates a second reflecting element. Then, reflected by the second reflecting element, it is incident on a silicon-based liquid crystal module. The silicon-based liquid crystal module modulates the laser beam of the first polarization state and emits image light to an imaging component. The imaging component transmits the image light and displays a projected image.

[0128] The following describes the implementation process of this utility model embodiment in an applicable application scenario.

[0129] In the projection industry, high brightness and wide color gamut have always been pursued. However, due to the linear polarization of laser light, interference occurs, and the small spot size and narrow angle of light rays result in persistent speckle problems in projected images. Existing technologies employ hybrid architectures combining fluorescent light sources and lasers to improve speckle performance.

[0130] LCOS panels use a CMOS chip as the circuit substrate and reflective layer. Liquid crystal is injected between the CMOS integrated circuit chip and the transparent glass substrate. The CMOS chip is polished and then used as a reflector. Light passes through the glass substrate and the liquid crystal material, and after dimming, it is reflected from the chip surface.

[0131] In an LCOS projection architecture, the illumination light is incident in a specific polarization state (typically P-state, depending primarily on the coating properties of the polarizing element). The illumination system is incident on the LCOS with an AOI of 0°, allowing for a compact system size. Furthermore, to reduce costs while maintaining performance, the optical system can have fewer components. Due to the characteristics of LCOS, the optical system is a polarized light source system, resulting in significant light source coherence and consequently, severe speckle in the LCOS system.

[0132] To solve the above technical problems, refer to Figure 6 As shown, this utility model provides an optical architecture (corresponding to the optical system described above). The optical path architecture of this utility model includes: an RGB laser module 601 (corresponding to the laser module described above), a diffuser 602 (corresponding to the diffusion device described above), a light-combining compound eye 603 (corresponding to the light homogenization device described above), an eccentric lens 604 (corresponding to the first lens described above), a reflector 605 (corresponding to the first reflecting element described above), a lens 606 (corresponding to the collimating lens described above), an illumination compound eye 607 (corresponding to the compound eye lens described above), a reflector 608 (corresponding to the second reflecting element described above), a lens 609, a polarization element 610 (corresponding to the polarization separation element described above), a compensation plate 611 (corresponding to the compensation element described above), an LCOS panel 612 (corresponding to the LCOS chip described above), an analyzer 613, and an imaging component 614, wherein...

[0133] The RGB laser module 601 includes: an RGB laser source 6011, a polarization conversion element 6012, and a beam splitter 6013. The RGB laser source generates RGB laser light with a polarization state such as the P-state. The polarization conversion element 6012, such as a half-wave plate, converts the polarization state, ensuring that the RGB laser light source has the same polarization state incident on the beam splitter within the system. The beam splitter can be a semi-reflective element such as a wire grid to split the light source beam, reducing the power density of the illumination compound eye and achieving better brightness uniformity.

[0134] The diffuser 602 can be a dynamic diffuser or a static diffuser, used to homogenize light and break up the coherence of the light source.

[0135] The 604 compound eye is used for homogenizing and shaping light beams.

[0136] The eccentric lens 605 is used to collimate and / or focus a laser beam.

[0137] Mirror 605 is used to deflect light.

[0138] Lens 606 is used to collimate and / or focus a laser beam. Lens 606 can also reduce the angle at which the laser beam is incident on the illumination compound eye. Lens 606 can be a spherical lens.

[0139] The Illumination Compound Eye 607 is used for homogenizing and shaping laser beams.

[0140] Mirror 608 is used to deflect light.

[0141] Lens 609 is used to collimate and / or focus a laser beam.

[0142] The polarization element 610 is used to transmit a P-state beam and reflect an S-state beam. The polarization element 610 can be a wire grid.

[0143] Compensator 611 is used to fine-tune the delay and eliminate residual delay in the pretilt angle of the LCOS panel, thereby improving system contrast under low F-number illumination.

[0144] The LCOS panel 612 enables polarization modulation of light.

[0145] The analyzer 613 is used to transmit S-state laser beams and absorb or reflect P-state light to improve contrast.

[0146] Imaging component 614 is used to display projected images by transmitting image light.

[0147] The optical path for this scheme is as follows:

[0148] The RGB laser module 601 emits P-state and S-state laser beams from the RGB laser source 6011. The S-state laser beam undergoes polarization conversion by the polarization conversion element 6012 to obtain a P-state laser beam. Further, the P-state laser beams emitted from the RGB laser source 6011 and the polarization conversion element 6012 are incident on the beam splitter 6013. The beam splitter 6013 transmits a portion of the polarized laser beam and reflects the remaining portion. Further, the P-state laser beam is diffused by the diffuser 602 to suppress spatial coherence and achieve dissipation.

[0149] Furthermore, the P-state laser beam emitted from the diffuser 602 is incident on the light-combining compound eye 603. The light-combining compound eye 603 homogenizes the P-state laser beam and illuminates it onto the reflector 605. After being reflected by the reflector 605, the beam is incident on the lens 606. The lens 606 converges the diverging P-state laser beam into a parallel beam. The illumination compound eye 607 homogenizes the parallel beam and then illuminates it onto the reflector 608. Then, after being reflected by mirror 608, focused and collimated by lens 609, the light is incident on polarization element 610. Polarization element 610 transmits the P-state laser beam, which passes through compensation plate 611 to reach LCOS panel 612. LCOS panel 612 polarizes the P-state laser beam to obtain S-state laser beam, and reflects the S-state laser beam back to compensation plate 611. Compensation plate 611 fine-tunes the delay device to eliminate the residual delay of the pretilt angle in LCOS panel, and then incident the S-state laser beam on polarization element 610. Polarization element 610 reflects the S-state laser beam to analyzer 613. Analyzer 613 transmits the S-state laser beam, absorbs or reflects the P-state light, and emits image light to imaging component 614. Imaging component 614 transmits the image light and displays the projected image.

[0150] In this embodiment of the invention, the addition of a compensation sheet can achieve a contrast ratio of approximately 7000:1 between white and dark images. The lower the contrast ratio of the dark image, the higher the contrast ratio. This compensation sheet is coated with an optical compensation film. This film can change the thickness and combination of the adhesive layer and the film layer, thereby adjusting and optimizing the in-plane and out-of-plane optical path difference compensation values. This allows for symmetrical compensation of the phase difference caused by birefringence at different viewing angles of the LCOS panel, reducing light leakage in the dark state of the projection device and improving the image contrast output by the projection lens module.

[0151] Here, the optical compensation film can be an A+C film layer. The A film layer can eliminate the residual delay in polarization conversion caused by the incomplete deflection of the liquid crystal pretilt angle, and the C film layer can compensate for the delay of large-angle light.

[0152] In this embodiment of the invention, the system can be divided into a bright state (also known as an on state) and a dark state. In the on state, light enters the LCOS panel in a P-state and enters the imaging component, such as the lens, in an S-state. In the dark state, light enters the LCOS in a P-state and returns to the light source via the original path (i.e., the liquid crystal does not flip). Therefore, in the dark state without a compensation plate, due to the delay in liquid crystal flipping, some light (S-state light) enters the lens. Adding a compensation plate can compensate for this phenomenon and improve contrast. The compensation plate is located in front of the LCOS panel, and the adjustment angle depends on the characteristics of the LCOS.

[0153] In some embodiments, in order to reduce speckle in the optical architecture, in addition to eliminating speckle by the diffuser described above, it can also be achieved by rotating the optical compound eye 603. The rotation of the optical compound eye 603 causes the light to be displaced in the emission direction, thereby reducing speckle noise.

[0154] In one implementation, the compound eye 603 includes a frame, bearings, and a drive assembly that support the compound eye elements.

[0155] In this embodiment, the compound eye 603 is configured to rotate around the rotation axis RL. The rotation axis RL is along the diagonal line, and the bearing is located along the diagonal line.

[0156] The drive assembly includes a permanent magnet located at the outer corner of the frame. Furthermore, a coil support is positioned corresponding to the magnet in the drive assembly, and an electromagnetic coil is mounted on the coil support. The electromagnetic coil generates a magnetic force that attracts or repels the magnet depending on the direction of the applied current. The energization of the electromagnetic coil in the coil support is controlled by a drive circuit. The rotation axis RL can be either horizontal or vertical in the direction of the compound eye 603.

[0157] In some embodiments, when the static / dynamic diffuser and / or the compound eye is rotated, the center of the incident laser beam spot optical axis and the rotation axis are not coaxial. That is, the intersection of the incident laser beam optical axis with the surface of the compound eye and the center point of the compound eye have a certain offset distance in a first direction, such as the diagonal direction, which further reduces speckle.

[0158] In some embodiments, increasing the distance between the intersection of the incident optical axis of the laser source and the surface of the compound eye and the center point of the compound eye in the first direction can be achieved in the following ways:

[0159] First, the RGB laser module is set horizontally, and the diffuser is set at an angle; second, the RGB laser module is set at an angle, and the diffuser is set horizontally; third, both the RGB laser module and the diffuser are set at an angle, and there is an angle between them on their extension lines; fourth, both the RGB laser module and the diffuser are set horizontally, and the eccentric lens is set at an angle.

[0160] This utility model embodiment also provides a projection device, see reference. Figure 7 As shown, the projection device includes an image processor 71 and a projection optical engine 72. Wherein:

[0161] The image processor 71 can be a microcontroller, a dedicated image processing chip, etc. The microcontroller can be an ARM chip, a microcontroller unit (MCU), etc.; the dedicated image processing chip can be an image signal processor (ISP), a graphics processing unit (GPU), an embedded neural network processing unit (NPU), etc. The image processor 71 can be used for video decoding, image quality processing, etc.

[0162] The projection optical engine 72 may include a driver chip, a spatial light modulator, and the optical system 100 described in the above embodiments. The spatial light modulator may be a digital micromirror device (DMD), a liquid crystal display (LCD), or a liquid crystal on silicon (LCOS), etc. The driver chip corresponds to the spatial light modulator; for example, the digital micromirror device may be driven by a digital light processing (DLP) element. The projection optical engine 72 is used to project the image to be projected into a projection screen.

[0163] In some embodiments, the projection device further includes a central controller 73 with one or more processing cores, which may be a CPU, ARM, MCU, or other controller. The central controller 73 is the control center of the projection device, connecting various parts of the entire projection device via various interfaces and lines. It can run or execute software programs and / or operating systems stored in the memory 74, and access data stored in the memory 74. Optionally, the image processor 71 and the central controller 73 can be integrated into a single processor.

[0164] In some embodiments, the projection device further includes a memory 74, an input module 75, a communication module 76, a power supply 77, and other components of one or more computer-readable storage media. Those skilled in the art will understand that... Figure 7 The projection device structure shown does not constitute a limitation on the projection device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0165] The memory 74 can be used to store software programs and operating systems. The central controller 73 executes various functional applications and data processing by running the software programs and operating systems stored in the memory 74. The memory 74 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the projection device, etc. In addition, the memory 74 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 74 may also include a memory controller to provide the central controller 73 with access to the memory 74.

[0166] The projection device may also include an input module 75, which can be used to receive input digital or character information, and generate remote control, keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0167] The projection device may also include a communication module 76. In some embodiments, the communication module 76 may include a wireless module, through which the projection device can perform short-range wireless transmission, thereby providing users with wireless broadband internet access. For example, the communication module 76 can be used to help users access streaming media.

[0168] The projection device also includes a power supply 77 that supplies power to the various components. In some embodiments, the power supply 77 can be logically connected to the central controller 73 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 77 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0169] It should be understood that the terms "an embodiment," "an embodiment," "an embodiment of the present invention," "the foregoing embodiment," "some embodiments," or "some implementations" mentioned throughout the specification mean that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an embodiment," "an embodiment of the present invention," "the foregoing embodiment," "some embodiments," or "some implementations" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of the present invention, the sequence number of the above-described processes does not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-described embodiment numbers are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0170] In the several embodiments provided by this utility model, it should be understood that the disclosed device can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0171] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units. They may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0172] In addition, in the various embodiments of this utility model, all functional units can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0173] It is worth noting that the accompanying drawings in this utility model embodiment are only for illustrating the schematic positions of various devices on the device and do not represent their actual positions in the device. The actual positions of each device or area may be changed or shifted according to the actual situation (e.g., the structure of the device). Furthermore, the proportions of different parts of the device in the drawings do not represent the actual proportions.

[0174] The above description is merely an embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An optical system, characterized in that, include: Laser modules, light homogenization devices, silicon-based liquid crystal modules, and imaging components; among them, The light homogenization device performs spatial coherence suppression and light homogenization on the first polarization state laser beam emitted by the laser module through movement; Wherein, when the optical homogenizing device is in motion, the laser beam is incident on the optical homogenizing device, and the intersection of the optical axis of the laser beam and the surface of the optical homogenizing device is not coaxial with the center point of motion of the optical homogenizing device; The silicon-based liquid crystal module is used to receive and modulate the laser beam of the first polarization state after passing through the light homogenization device, and to emit image light to the imaging component. The imaging component is used to transmit the image light to display the projected image.

2. The optical system according to claim 1, characterized in that, The light homogenization device includes a frame supporting the compound eye element, a bearing, and a drive assembly; wherein the bearing is disposed on the rotation axis or extension line of the frame and is connected to the frame, and the drive assembly drives the frame to move by driving the bearing.

3. The optical system according to claim 2, characterized in that, When the light homogenizing device rotates about its own diagonal as the axis of rotation, the intersection point is located on the diagonal.

4. The optical system according to claim 1, characterized in that, The optical system further includes: a diffusion device, and / or, a first lens; wherein, The diffusion device is located between the laser module and the light homogenization device, and the diffusion device is used to suppress the spatial coherence of the laser beam in the first polarization state. The first lens is located between the diffusion device and the light homogenizing device, or between the light homogenizing device and the silicon-based liquid crystal module, and the center of the first lens has a lateral displacement relative to the optical axis of the laser beam.

5. The optical system according to claim 4, characterized in that, The laser module and the diffusion device are inclined relative to each other, and the first lens is placed horizontally, or... The laser module and the diffusion device are relatively parallel, and the first lens is placed at an angle.

6. The optical system according to claim 5, characterized in that, The relative tilt between the laser module and the diffusion device includes any one of the following: The laser module is placed horizontally, and the diffusion device is placed at an angle. The laser module is placed at an angle, and the diffusion device is placed horizontally. Both the laser module and the diffusion device are placed at an angle and are not parallel.

7. The optical system according to claim 5, characterized in that, The relative parallelism between the laser module and the diffusion device includes that both the laser module and the diffusion device are placed horizontally.

8. The optical system according to any one of claims 1 to 7, characterized in that, The laser module includes at least a portion of a laser source, a polarization conversion element, and a beam splitter element, wherein... The laser source is used to generate a laser beam in the first polarization state and / or the second polarization state; The polarization conversion element is used to convert the polarization state of the laser beam in the second polarization state to obtain the laser beam in the first polarization state. The beam splitter is used to transmit a partially polarized laser beam and reflect the remaining partially polarized laser beam.

9. The optical system according to any one of claims 1 to 7, characterized in that, The silicon-based liquid crystal module includes: a polarization separation element, a compensation element, a silicon-based liquid crystal LCOS chip, and a polarization analyzer, wherein... The polarization separation element is used to transmit a laser beam of the first polarization state and reflect a laser beam of the second polarization state. The compensation element is used to eliminate the residual delay in polarization conversion of the laser beam in the LCOS chip; The LCOS chip is used to polarize the laser beam of the first polarization state and reflect the laser beam of the second polarization state. The analyzer is used to transmit a laser beam of the second polarization state and absorb or reflect a laser beam of the first polarization state.

10. The optical system according to any one of claims 1 to 7, characterized in that, The optical system also includes: The first reflecting element is used to reflect the laser beam emitted from the light homogenizing device; A beam homogenization module is used to homogenize the laser beam emitted from the first reflective element. The second reflective element is used to reflect the laser beam emitted from the uniform light module and incident it onto the silicon-based liquid crystal module.

11. The optical system according to claim 10, characterized in that, The homogenizing module includes: a collimating lens and a compound eye lens, wherein... The collimating lens is used to collimate the laser beam; The compound eye lens is used to homogenize the laser beam that has passed through the collimating lens.

12. A projection device, characterized in that, The projection device includes the optical system according to any one of claims 1 to 11.

Images