Light machine and projection equipment
By using polarization prisms in the optical machine of the laser projection device to destroy the coherence between the sub-light light source lights, the problem of image speckle in the laser projection device is solved, and the display effect is significantly improved.
Patent Information
- Application Number
- CN202421821275.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-07-29
AI Technical Summary
Due to the high coherence of lasers, the projected images have speckle problems, making it difficult to design a photo machine with good speckle dissipation effect.
An optical machine is designed, including at least one laser module and a plurality of polarization prisms, each polarization prism is arranged on the light exit side of the laser module for receiving and emitting sub-light source light of different wavelengths, and destroying the coherence between sub-light source light by changing the polarization direction and phase delay.
By destroying the coherence between sub-light light sources, the speckle of the projected image is weakened and the display effect of the projection device is improved.
Smart Images
Figure CN223006374U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of optical technologies, and in particular, to an optical engine and a projection device including the optical engine. Background Art
[0002] Due to the high coherence of lasers, there are still problems with speckles in the images projected by current laser projection devices. Therefore, how to design an optical engine for projection devices with good speckle reduction effect has become a concern for manufacturers. Summary of the Utility Model
[0003] The present disclosure discloses an optical engine and a projection device, which are beneficial to reducing the speckles of the projected image.
[0004] In a first aspect, the present disclosure relates to an optical engine, including:
[0005] At least one laser module for emitting a plurality of sub-source lights with different wavelengths; and
[0006] A plurality of polarization prisms, each polarization prism is disposed on the light-emitting side of one of the laser modules, and each polarization prism corresponds to one of the sub-source lights of the corresponding laser module. Each polarization prism is configured to receive and emit a corresponding one of the sub-source lights, and each sub-source light has more polarization directions after being emitted from the corresponding polarization prism than before being incident.
[0007] The optical engine provided by the embodiments of the present disclosure can spatially destroy the coherence between the sub-source lights by disposing polarization prisms on the light-emitting side of the laser module, and each polarization prism corresponds to one of the sub-source lights of the corresponding laser module. Each polarization prism is configured to receive and emit a corresponding one of the sub-source lights, and each sub-source light has more polarization directions after being emitted from the corresponding polarization prism than before being incident. Therefore, the coherence between the sub-source lights can be destroyed spatially, and since the strength of the speckles of the projected image is related to the polarization direction of the sub-source lights, each sub-source light having multiple polarization directions after being emitted is beneficial to reducing the speckles of the projected image and improving the display effect of the projection device using the optical engine.
[0008] In one embodiment, the thicknesses and / or materials of the plurality of polarization prisms are different, and the polarization prism is further configured to cause the incident sub-source light to have a phase delay and then be emitted.
[0009] In one embodiment, the sub-source light generates or an odd multiple of the phase delay after being emitted from the polarization prism.
[0010] In one embodiment, the optical engine further includes a driving module, which is configured to control the movement of at least one of the polarization prisms relative to the laser module.
[0011] In one embodiment, each of the laser modules includes at least two lasers arranged along a first direction, and the driving module is configured to control at least one of the polarization prisms to perform periodic translational movement along the first direction. During one translational period, the sub-source light emitted by the laser module is received by the correspondingly arranged polarization prism.
[0012] In one embodiment, the lasers are configured to emit the sub-source light, and the sub-source light emitted by at least two of the lasers has different wavelengths.
[0013] In one embodiment, the optical engine further includes at least one light guiding module, and each light guiding module is correspondingly arranged for one of the laser modules;
[0014] The light guiding module is configured to reflect multiple beams of the sub-source light emitted by multiple lasers on the laser module along the first direction and combine them into source light.
[0015] In one embodiment, the polarization prism includes a first wedge prism and a second wedge prism, and the inclined surfaces of the first wedge prism and the second wedge prism are in mutual contact.
[0016] In one embodiment, the included angle between the optical axis of the first wedge prism and the optical axis of the second wedge prism is 45° ± 1°.
[0017] In a second aspect, the present disclosure also relates to a projection device, including:
[0018] The optical engine as described in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0020] Figure 1 It is a schematic structural diagram of the optical engine in the embodiment provided by the present disclosure.
[0021] Figure 2 It is a schematic optical path diagram of the optical engine in the embodiment provided by the present disclosure.
[0022] Figure 3 It is a schematic structural diagram of the polarization prism in the embodiment provided by the present disclosure.
[0023] Figure 4 It is a schematic diagram of a partial optical path before the polarization prism moves in the embodiments provided by the present disclosure.
[0024] Figure 5 It is a schematic diagram of a partial optical path after the polarization prism moves in the embodiments provided by the present disclosure.
[0025] Description of main component symbols
[0026] Opto-mechanical 100
[0027] Laser module 1
[0028] First laser module 1a
[0029] Second laser module 1b
[0030] Laser 11
[0031] First laser 111
[0032] Second laser 112
[0033] Light-emitting diode 11a
[0034] Polarization prism 3
[0035] First wedge prism 31
[0036] Vertical planes 31a, 32a
[0037] Inclined planes 31b, 32b
[0038] First optical axis 31c
[0039] Second wedge prism 32
[0040] Second optical axis 32c
[0041] Drive module 5
[0042] Light guiding module 7
[0043] Mirror 71
[0044] Beam combiner 73
[0045] Thicknesses d1, d
[0046] First direction X
[0047] Second direction Y
[0048] Sub-source light L10
[0049] Source light L1
[0050] Red laser R
[0051] Green laser G
[0052] Blue laser B
[0053] Polarization direction P Specific embodiments
[0054] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.
[0055] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.
[0056] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence relationship of the functions performed by these devices, modules or units.
[0057] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only for illustrative purposes and are not used to limit the scope of these messages or information.
[0058] How to design an optical engine for a projection device with a simple structure and good speckle dissipation effect has always been a concern for manufacturers. At present, the main solution is to set a depolarizing prism on the light output side after the light combination of the light source device. The depolarizing prism reduces the coherence of the light source light by changing the phase delay of the light source light. However, since the light source light includes light rays with different wavelengths, and the phase delay generated by the light source light passing through the depolarizing prism is a function of the wavelength, light rays with different wavelengths passing through the depolarizing prism will generate different amounts of phase delay, resulting in difficulty in significantly reducing the coherence of the light source light, that is, the above solution has a poor speckle dissipation effect.
[0059] Please refer to Figure 1, the optical engine 100 of the embodiments of the present disclosure includes two laser modules 1, a plurality of polarization prisms 3, a driving module 5, and a light guiding module 7. At least one laser module 1 is configured to emit a plurality of seed light sources L10 with different wavelengths. Each polarization prism 3 is disposed on the light emitting side of a laser module 1, and each polarization prism 3 corresponds to a kind of seed light source L10 of the corresponding laser module 1. Each polarization prism 3 is configured to receive and emit a corresponding kind of seed light source L10. After each seed light source L10 is emitted from the corresponding polarization prism 3, it has more polarization directions than before incidence.
[0060] In this embodiment, the two laser modules 1 are respectively a first laser module 1a and a second laser module 1b, and the structures and functions of the first laser module 1a and the second laser module 1b are basically the same. In other embodiments, the number of laser modules 1 may also be one or more, and the present disclosure does not make any limitation.
[0061] Please refer to Figure 1 and Figure 2 , each laser module 1 includes two lasers 11 arranged along the first direction X, namely a first laser 111 and a second laser 112. The two lasers 11 can respectively emit seed light sources L10 with different wavelengths. The first laser 111 includes four lamp beads 11a for emitting red laser R (seed light source L10), and the red laser R corresponds to a polarization prism 3. The second laser 112 includes five lamp beads 11a, two of which are used to emit green laser G (seed light source L10), and the other lamp beads 11a are used to emit blue laser B (seed light source L10). The green laser G corresponds to a polarization prism 3, and the blue laser B corresponds to a polarization prism 3, so that the laser module 1 emits a plurality of seed light sources L10 with different wavelengths. In other embodiments, the laser module 1 may include a plurality of lasers 11 arranged along the first direction X, and each laser 11 may be provided with a plurality of lamp beads 11a for emitting laser with a single wavelength, and the present disclosure does not make any limitation.
[0062] Specifically, a polarization prism 3 is correspondingly disposed at the light emitting position of the first laser 111, and two polarization prisms 3 are correspondingly disposed at the light emitting position of the second laser 112. Among them, a polarization prism 3 is correspondingly disposed at the light emitting position of the lamp bead 11a for emitting blue laser B, and a polarization prism 3 is correspondingly disposed at the light emitting position of the lamp bead 11a for emitting green laser G. Each polarization prism 3 is configured to receive a kind of seed light source L10 from the corresponding laser 11, and is configured to change the polarization direction of the seed light source L10 and then emit a kind of seed light source L10. After each seed light source L10 is emitted from the corresponding polarization prism 3, it has a plurality of polarization directions.
[0063] Please refer toFigure 2 and Figure 3 , each polarization prism 3 includes a first wedge prism 31 and a second wedge prism 32, and the inclined surface 31b of the first wedge prism 31 is in contact with the inclined surface 32b of the second wedge prism 32. The optical axis of the first wedge prism 31 is defined as the first optical axis 31c, and the optical axis of the second wedge prism 32 is defined as the second optical axis 32c. The included angle between the first optical axis 31c and the second optical axis 32c is 45° ± 1°. For example, the included angle between the first optical axis 31c and the second optical axis 32c can be any value among 44°, 45°, or 46°. Both the first optical axis 31c and the second optical axis 32c are perpendicular to the incident direction when the sub-light source light L10 is incident on the corresponding polarization prism 3 by each laser 11. When the included angle between the first optical axis 31c and the second optical axis 32c is 45° ± 1°, the effect of the speckle after the sub-light source light L10 passes through the first wedge prism 31 and the second wedge prism 32 is the best. In practical applications, there may also be a certain error in the included angle between the first optical axis 31c and the second optical axis 32c, and the present disclosure does not limit this.
[0064] Specifically, the first wedge prism 31 further includes a vertical surface 31a. The inclined surface 31b is inclined with respect to the vertical surface 31a. There is a wedge angle between the vertical surface 31a and the inclined surface 31b. The second wedge prism 32 further includes a vertical surface 32a. The inclined surface 32b is inclined with respect to the vertical surface 32a. There is a wedge angle between the vertical surface 32a and the inclined surface 32b. When the inclined surface 31b of the first wedge prism 31 is in contact with the inclined surface 32b of the second wedge prism 32, the vertical surface 31a of the first wedge prism 31 and the vertical surface 32a of the second wedge prism 32 are parallel to each other. That is, the wedge angle of the first wedge prism 31 is equal to the wedge angle of the second wedge prism 32. The sub-light source light L10 is perpendicularly incident on the first wedge prism 31 from the vertical surface 31a and perpendicularly exits from the vertical surface 32a of the second wedge prism 32.
[0065] Please refer to Figure 2 、 Figure 3 and Figure 4, taking the first wedge prism 31 as an example, define the distance between the vertical surface 31a and the inclined surface 31b as the thickness d1 of the first wedge prism 31. Due to the existence of the inclined surface 31b, the thickness d1 of the first wedge prism 31 is different at different positions. Since the beam cross-section of the sub-light source light L10 has a certain size, in the beam of the sub-light source light L10, different light rays are incident from different positions of the first wedge prism 31 and exit from different positions of the first wedge prism 31. Thus, in the beam of the sub-light source light L10, different light rays pass through the first wedge prism 31 with different thicknesses d1, which results in different optical paths between the light rays at different positions in the vertical surface 31a and the inclined surface 31b. Therefore, different light rays in the beam of the sub-light source light L10 passing through the first wedge prism 31 generate different phase delays.
[0066] In this embodiment, the sub-light source light L10 incident on the first wedge prism 31 is linearly polarized light. Since different light rays in the beam of the sub-light source light L10 passing through the first wedge prism 31 generate different phase delays, the sub-light source light L10 exiting from different positions of the first wedge prism 31 has multiple polarization directions.
[0067] The second wedge prism 32 has the same function as the first wedge prism 31. The sub-light source light L10 projected onto the first wedge prism 31, after passing through the first wedge prism 31 and the second wedge prism 32, due to the phase delay caused by different thicknesses, the sub-light source light L10 exiting from different positions of the polarization prism 3 in the first direction X has multiple polarization directions P. It should be noted that Figure 4 the polarization direction P only schematically shows individual polarization directions P of the sub-light source light L10 exiting from different positions of the polarization prism 3, and is not all the polarization directions P of the sub-light source light L10.
[0068] The polarization prism 3 is used to make the incident sub-light source light L10 generate a phase delay and then exit. In this embodiment, the polarization prism 3 is used to make the incident sub-light source light L10 generate or an odd multiple of the phase delay and then exit, and the sub-light source light L10 generates or an odd multiple of the phase delay after exiting from the polarization prism 3; in other embodiments, the polarization prism 3 can also be used to make the incident sub-light source light L10 generate a phase delay of π or an odd multiple of π and then exit, which is not limited in this disclosure. In this embodiment, since the wavelengths of the sub-light source lights L10 emitted by different lasers 11 in the laser module 1 are different, in order to make the sub-light source lights L10 of different wavelengths all generate or After a phase delay that is an odd multiple of , it exits from the corresponding polarization prism 3. In this embodiment, multiple polarization prisms 3 are provided with different thicknesses d, or multiple polarization prisms 3 are provided with different materials.
[0069] After the sub-light source light L10 passes through the polarization prism 3, the overall phase delay δ generated with respect to before the light is incident on the polarization prism 3 from the laser 11 is related to the wavelength λ of the sub-light source light L10 and the thickness d of the polarization prism 3. Please refer to the following relational expression (1):
[0070]
[0071] n0 is the ordinary light refractive index of the material of the polarization prism 3, and n e is the extraordinary light refractive index of the material of the polarization prism 3.
[0072] For example, when the materials of the first wedge prism 31 and the second wedge prism 32 are both mica, n0 of mica is approximately 1.5936, and n e of mica is approximately 1.5977. If the wavelength of the sub-light source light L10 incident on the polarization prism 3 is 525 nm, and the polarization prism 3 is to cause the incident sub-light source light L10 to generate a phase delay, the thickness d of the polarization prism 3 needs to be set to approximately 0.0032 cm. Therefore, in order to cause the incident sub-light source light L10 to generate or an odd multiple of the phase delay and then exit, the thickness d of the polarization prism 3 can be changed according to the wavelength of the incident sub-light source light L10, and the thicknesses d of multiple polarization prisms 3 can be different.
[0073] In addition, if it is required that the thicknesses d of all the polarization prisms 3 in the optical machine 100 are the same and all cause the incident sub-light source light L10 to generate or an odd multiple of the phase delay and then exit, the material of the polarization prism 3 can also be changed, that is, the value of |n0 - n e | in formula (1) is changed, and the materials of multiple polarization prisms 3 can be different. In other embodiments, the first wedge prism 31 and the second wedge prism 32 can also be other materials, such as quartz or calcite, etc. The materials of the first wedge prism 31 and the second wedge prism 32 can be the same or different, and the present disclosure does not limit this. The first wedge prism 31 and the second wedge prism 32 can be fixed by gluing, for example, ultraviolet light-curing glue, or other methods can also be used for fixing, and the present disclosure does not limit this.
[0074] Please refer to Figure 4 and Figure 5, the driving module 5 is used to control the movement of at least one polarization prism 3 relative to the laser module 1. In this embodiment, the driving module 5 is used to control all the polarization prisms 3 to perform periodic translation along the first direction X. Specifically, within one translation period, the sub-source light L10 emitted by the laser module 1 is received by the correspondingly arranged polarization prism 3. The sub-source light L10 sequentially passes through the first wedge prism 31 and the second wedge prism 32. Since the polarization prism 3 performs periodic translation relative to the laser module 1, the optical path that the same beam of sub-source light L10 passes through in the first wedge prism 31 and the optical path that it passes through in the second wedge prism 32 are different at different times. Therefore, the light beam of the sub-source light L10 will generate different phase delays at different times, that is, the sub-source light L10 at the same position along the first direction X has different polarization directions P at different times. Therefore, by movably arranging the polarization prism 3 on the light-emitting side of the laser module 1, the polarization prism 3 can move relative to the laser module 1, so that the coherence between the sub-source lights L10 can be further destroyed in terms of time, which is beneficial to further reducing the speckle of the transmitted image. In other embodiments, the driving module 5 can also only control one or two of the polarization prisms 3 to move relative to the laser module 1, or the driving module 5 can also be used to control multiple polarization prisms 3 to rotate clockwise (counterclockwise) relative to the laser module 1 or other ways of generating displacement relative to the laser module 1, and the present disclosure does not make any restrictions. It should be noted that Figure 5 the polarization direction P only schematically shows the individual polarization directions P of the sub-source lights L10 emitted from different positions of the polarization prism 3, and is not all the polarization directions P of the sub-source lights L10.
[0075] In this embodiment, the driving module 5 is a shaker, and each polarization prism 3 is connected to the shaker. The shaker is used to control the polarization prism 3 to move along the same direction with the same vibration period. In other embodiments, the driving module 5 can also be a device such as a motor that can control the polarization prism 3 to move along the same direction with the same vibration period, and the present disclosure does not make any restrictions.
[0076] Please also refer to Figure 1 and Figure 2 , in this embodiment, the optical engine 100 includes two light guiding modules 7. The light guiding modules 7 are arranged on the light-emitting side of the polarization prism 3. The polarization prism 3 is located between the light guiding module 7 and the laser module 1. The light guiding modules 7 correspond to the laser module 1 one by one. Each light guiding module 7 is used to receive and emit the sub-source light L10 emitted by the polarization prism 3. The light guiding module 7 is used to reflect and combine the multiple beams of sub-source light L10 emitted by the multiple polarization prisms 3 on the light-emitting side of the same laser module 1 along the first direction X into the source light L1. In other embodiments, the optical engine 100 can also include one or more light guiding modules 7, and the present disclosure does not make any restrictions on this.
[0077] Specifically, the two laser modules 1 corresponding to the two light guiding modules 7 are staggeredly arranged in the second direction Y, and the first direction X is perpendicular to the second direction Y, that is, the light emitting directions of the two laser modules 1 are opposite. The arrangement of the two laser modules 1 provided in the embodiments of the present disclosure is only an exemplary illustration and does not represent a limitation on the number of the laser modules 1 staggeredly arranged in the second direction Y. In other embodiments, in accordance with the manner provided in this embodiment, more laser modules 1 can also be staggeredly and / or arranged side by side in the second direction Y, and the present disclosure does not limit this.
[0078] Each light guiding module 7 includes a reflecting mirror 71 and a light combining mirror 73. The reflecting mirror 71 is arranged corresponding to the first laser 111 of each laser module 1, the polarization prism 3 is located between the first laser 111 and the reflecting mirror 71, the light combining mirror 73 is arranged corresponding to the second laser 112 of each laser module 1, and the polarization prism 3 is located between the second laser 112 and the light combining mirror 73. Specifically, the reflecting mirror 71 is used to reflect the blue laser B (sub-source light L10) and the green laser G (sub-source light L10) emitted from the polarization prism 3, so that they are emitted along the first direction X.
[0079] The light combining mirror 73 is arranged on the light emitting side of the first laser 111 of each laser module 1, and is used to reflect the red laser R (sub-source light L10) emitted from the polarization prism 3, so that it is emitted along the first direction X. The light combining mirror 73 is also located on the optical paths of the blue laser B and the green laser G at the same time. The light combining mirror 73 is further used to transmit the blue laser B and the green laser G emitted from the reflecting mirror 71 while reflecting the red laser R emitted from the polarization prism 3, so that the blue laser B, the green laser G and the red laser R are combined into the source light L1 via the light combining mirror 73. The projections of the light combining mirror 73 and the reflecting mirror 71 in the first direction X completely coincide, so that the optical axes of the blue laser B, the green laser G and the red laser R in the first direction X are located in the same plane, thereby minimizing the projected area of the combined source light L1 in the first direction X, and further improving the brightness of the source light L1.
[0080] In this embodiment, the light combining mirror 73 is specifically a dichroic mirror, and the dichroic mirror is configured to be able to transmit the blue laser B and the green laser G and reflect the red laser R. In other embodiments, the light combining mirror 73 can also be other optical elements that can achieve the above functions, such as a hollow reflecting lens or a semi-transmissive and semi-reflective lens, etc.
[0081] The optical engine 100 further includes a light homogenizing component (not shown in the figure), a light modulation component (not shown in the figure), and a lens component (not shown in the figure). The light homogenizing component is disposed on one side of the light guiding module 7 for emitting the light source light L1. The light homogenizing component is configured to receive the light source light L1 emitted from the light guiding module 7 and homogenize the light source light L1. By providing the light homogenizing component, it is not only beneficial to uniform the light intensity of the light source light L1 but also beneficial to achieve a good effect of speckle dissipation. The light valve is configured to receive the homogenized light source light L1 and modulate the light source light L1 into image light. The light valve can be any one of a liquid crystal display (LCD), a digital micro-mirror device (DMD), and a liquid crystal on silicon (LCOS). The lens component is configured to receive the image light emitted from the light valve and project the image light out at a certain magnification.
[0082] In the optical engine 100 provided by the embodiment of the present disclosure, by disposing a polarization prism 3 on the light emitting side of the laser module 1, and each polarization prism 3 corresponds to a kind of sub-light source light L10 of the corresponding laser module 1. Each of the polarization prisms 3 is configured to receive and emit a corresponding kind of the sub-light source light L10. After each sub-light source light L10 is emitted from the corresponding polarization prism 3, the polarization direction thereof is more than that before incidence. Thus, the coherence between the sub-light source lights L10 can be destroyed spatially. And since the strength of the speckle of the projected image is related to the polarization direction of the sub-light source light L10, each sub-light source light L10 having multiple polarization directions after emission is beneficial to reducing the speckle of the projected image, and is beneficial to improving the display effect of the projection device using the optical engine 100. And by movably disposing the polarization prism 3 on the light emitting side of the laser module 1, the polarization prism 3 can move relative to the laser module 1. Thus, the coherence between the sub-light source lights L10 can be further destroyed temporally, and further beneficial to further reducing the speckle of the transmitted image, and beneficial to improving the display effect of the projection device using the optical engine 100.
[0083] The embodiment of the present disclosure further provides a projection device, which includes the optical engine 100 in the above embodiment.
[0084] The above are only the embodiments of the present disclosure, and do not limit the patent scope of the present disclosure accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present disclosure, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present disclosure.
Claims
1. An optical machine, characterized in that: include: at least one laser module, the at least one laser module being configured to emit a plurality of sub-light source lights having different wavelengths; and A plurality of polarization prisms, each of which is arranged on the light-emitting side of a laser module, and each of which corresponds to a sub-light source of the corresponding laser module, and each of which is used to receive and emit a corresponding sub-light source, and each of which has more polarization directions after emitting from the corresponding polarization prism than before incident.
2. The optical machine according to claim 1, characterized in that: The thickness and / or material of the plurality of polarizing prisms are different, and the polarizing prisms are also used to cause the incident light of the sub-light source to be phase delayed before being emitted.
3. The optical machine according to claim 2, characterized in that: The sub-light source light is emitted from the polarization prism to generate or An odd multiple of the phase delay.
4. The optical machine according to claim 1, characterized in that: The optical machine further includes a driving module, and the driving module is used to control at least one of the polarization prisms to move relative to the laser module.
5. The optical machine according to claim 4, characterized in that: Each of the laser modules comprises at least two lasers arranged along a first direction. The driving module is used to control at least one of the polarizing prisms to translate periodically along the first direction. The sub-light source light emitted by the laser module in one translation cycle is received by the corresponding polarizing prism.
6. The optical machine according to claim 5, characterized in that: The laser is used to emit the sub-light source light, and the sub-light source light emitted by at least two of the lasers has different wavelengths.
7. The optical machine according to claim 6, characterized in that: The optical machine further comprises at least one light guiding module, each of which is arranged corresponding to one of the laser modules; The light guiding module is used to combine the multiple beams of sub-light source light emitted by the multiple lasers on the laser module into light source light after being reflected along the first direction.
8. The optical machine according to claim 1, characterized in that: The polarizing prism includes a first wedge-shaped prism and a second wedge-shaped prism, and the inclined surface of the first wedge-shaped prism and the inclined surface of the second wedge-shaped prism are attached to each other.
9. The optical machine according to claim 8, characterized in that: The angle between the optical axis of the first wedge-shaped prism and the optical axis of the second wedge-shaped prism is 45°±1°.
10. A projection device, characterized in that: include: An optical machine as claimed in any one of claims 1 to 9.