Lighting system and projection equipment

Abstract

The present invention relates to an illumination system comprising a first light source device for providing first, second, and third light beams, and a first compensation light beam. A second light source device for providing fourth, fifth, and sixth light beams, and a second compensation light beam. A first polarization element is disposed in the transmission path of the first light beam and the first compensation light beam. A second polarization element is disposed in the transmission path of the fourth light beam and the second compensation light beam. The illumination system of the present invention and a projection device employing the illumination system improve color uniformity by unifying the polarization states of all light beams.

Description

[0001] This application is a divisional application of the Chinese invention patent application with an application date of April 30, 2020, application number 202010361226.X, and invention name “Lighting system and projection device”. Technical Field

[0002] The present invention relates to an optical system and an electronic device, and in particular to an illumination system and a projection device. Background Art

[0003] Projection devices are used to produce large-scale displays, and they continue to advance with the evolution and innovation of science and technology. The imaging principle of a projection device is to convert the illumination beam generated by an illumination system into an image beam through a light valve. This image beam is then projected through a projection lens onto a target object (e.g., a screen or wall) to form a projected image.

[0004] Furthermore, lighting systems have evolved, driven by market demands for projector brightness, color saturation, lifespan, and environmental friendliness. These systems have evolved from ultra-high-performance lamps (UHP lamps) and light-emitting diodes (LEDs) to the most advanced laser diode (LD) light sources. In current optical systems, multiple laser diodes with different wavelengths can be modularized into multi-chip laser (MCL) modules, further reducing the size of the projector's optical components. However, conventional coating processes cannot achieve consistent transmittance in both the S and P polarization directions. Consequently, one polarization direction must have higher transmittance, resulting in lower brightness for the red, blue, or green light components in the MCL module. Consequently, current optical systems using MCLs are prone to issues such as lower brightness for the red, blue, or green light components, as well as poor color uniformity.

[0005] The "Background" section is intended only to facilitate understanding of the present invention. Therefore, the information disclosed in this section may contain information that is not conventionally known to those skilled in the art. The information disclosed in this section does not imply that the information or the problems to be solved by one or more embodiments of the present invention were known or understood by those skilled in the art prior to the filing of this application. Summary of the Invention

[0006] The present invention provides an illumination system and a projection device, which can improve color uniformity.

[0007] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0008] To achieve one, some, or all of the above objectives, or other objectives, the present invention provides an illumination system comprising a first light source device, a second light source device, a first polarization element, and a second polarization element, wherein the first light source device and the second light source device are both multi-color laser modules. The first light source device is configured to provide a first light beam, a second light beam, a third light beam, and a first compensation light beam. The second light source device is configured to provide a fourth light beam, a fifth light beam, a sixth light beam, and a second compensation light beam. The first polarization element is disposed in the transmission path of the first light beam and the first compensation light beam. The second polarization element is disposed in the transmission path of the fourth light beam and the second compensation light beam. The first light beam and the first compensation light beam have the same polarization state, and the second light beam and the third light beam have the same polarization state and are different from the polarization state of the first light beam and the first compensation light beam before passing through the first polarization element. The first light beam and the first compensation light beam pass through the first polarization element, causing the polarization state of the first light beam and the first compensation light beam to change to the same polarization state as the second light beam and the third light beam. The fourth light beam has the same polarization state as the second compensation light beam, the fifth light beam has the same polarization state as the sixth light beam and is different from the polarization state of the fourth light beam and the second compensation light beam before passing through the second polarization element, and the fourth light beam and the second compensation light beam pass through the second polarization element, so that the polarization state of the fourth light beam and the second compensation light beam is changed to be the same as the polarization state of the fifth light beam and the sixth light beam.

[0009] To achieve one, some, or all of the above objectives, or other objectives, the present invention further provides a projection device comprising an illumination system, at least one light valve, and a projection lens. The illumination system is configured to provide an illumination beam. The illumination system comprises a first light source device, a second light source device, a first polarization element, and a second polarization element. The first and second light sources are multi-color laser modules. The first light source device is configured to provide a first light beam, a second light beam, a third light beam, and a first compensation light beam. The second light source device is configured to provide a fourth light beam, a fifth light beam, a sixth light beam, and a second compensation light beam. The first polarization element is disposed in the transmission path of the first light beam and the first compensation light beam. The second polarization element is disposed in the transmission path of the fourth light beam and the second compensation light beam. The first light beam and the first compensation light beam have the same polarization state, while the second light beam and the third light beam have the same polarization state and are different from the polarization state of the first light beam and the first compensation light beam before passing through the first polarization element. Passage of the first light beam and the first compensation light beam through the first polarization element causes the polarization state of the first light beam and the first compensation light beam to be the same as the polarization state of the second light beam and the third light beam. The fourth light beam and the second compensation light beam have the same polarization state, and the fifth light beam and the sixth light beam have the same polarization state and are different from the polarization state of the fourth light beam and the second compensation light beam before passing through the second polarization element. The fourth light beam and the second compensation light beam pass through the second polarization element, causing the polarization state of the fourth light beam and the second compensation light beam to be the same as the polarization state of the fifth light beam and the sixth light beam. At least one light valve is disposed in the transmission path of the illumination light beam to convert the illumination light beam into an image light beam. A projection lens is disposed in the transmission path of the image light beam to project the image light beam out of the projection device.

[0010] Based on the above, embodiments of the present invention have at least one of the following advantages or effects. In the illumination system and projection device of the present invention, a first light source device provides a first light beam, a second light beam, a third light beam, and a first compensation light beam, and a first polarization element is disposed on the first light beam and the first compensation light beam so that, when the first light beam and the first compensation light beam pass through the first polarization element, the polarization states of the first light beam and the first compensation light beam are changed to be the same as the polarization states of the second light beam and the third light beam. Therefore, the polarization states of the first light beam, the second light beam, the third light beam, and the first compensation light beam are all the same when they pass through the homogenizing element. A second light source device provides a fourth light beam, a fifth light beam, a sixth light beam, and a second compensation light beam, and a second polarization element is disposed on the fourth light beam and the second compensation light beam so that, when the fourth light beam and the second compensation light beam pass through the second polarization element, the polarization states of the fourth light beam and the second compensation light beam are changed to be the same as the polarization states of the fifth light beam and the sixth light beam. Therefore, the polarization states of the fourth light beam, the fifth light beam, the sixth light beam, and the second compensation light beam are all the same when they pass through the homogenizing element.

[0011] In this way, the polarization states of all light beams can be unified to improve color uniformity.

[0012] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. 1 is a schematic diagram of a projection device according to an embodiment of the present invention.

[0014] Figure 2 FIG. 1 is a schematic diagram of a lighting system according to an embodiment of the present invention.

[0015] Figure 3 FIG. 4 is a schematic diagram of a lighting system according to another embodiment of the present invention.

[0016] Figure 4 FIG. 4 is a schematic diagram of a lighting system according to another embodiment of the present invention.

[0017] Description of Reference Numerals

[0018] 10: Projection device

[0019] 60: Light valve

[0020] 70: Projection lens

[0021] 100, 100A, 100B: Lighting system

[0022] 110: Light source device

[0023] 112: First laser light source

[0024] 114: Second laser light source

[0025] 116: Third laser light source

[0026] 118: First compensation laser light source

[0027] 120: light uniformity element

[0028] 130,130A: Polarized components

[0029] 140,140A: Light guide device

[0030] 142: Reflective element

[0031] 144:Spectral element

[0032] 144A: First spectroscopic element

[0033] 144B: Second beam splitter

[0034] 146: Semi-reflective element

[0035] 150:Diffusion device

[0036] 160: Focusing element

[0037] 170: Lens

[0038] L1: First beam

[0039] L2: Second beam

[0040] L3: The third beam

[0041] L4: first compensation beam

[0042] LB: Lighting beam

[0043] LI: Image beam. DETAILED DESCRIPTION

[0044] The aforementioned technical contents, features, and functions of the present invention will be more clearly demonstrated in the following detailed description of the preferred embodiments, which is accompanied by the accompanying drawings. Directional terms such as up, down, left, right, front, and back, used in the following embodiments, are merely references to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present invention.

[0045] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 1 This embodiment provides a projection device 10 comprising an illumination system 100, at least one light valve 60, and a projection lens 70. The illumination system 100 is configured to provide an illumination beam LB. The light valve 60 is disposed in the transmission path of the illumination beam LB and is configured to convert the illumination beam LB into an image beam LI. The projection lens 70 is disposed in the transmission path of the image beam LI and is configured to project the image beam LI out of the projection device 10 onto a projection target (not shown), such as a screen or wall.

[0046] The light valve 60 is, for example, a reflective light modulator such as a Liquid Crystal On Silicon (LCoS) panel or a Digital Micro-mirror Device (DMD). In some embodiments, the light valve 60 may also be a transmissive light modulator such as a Transparent Liquid Crystal Panel, an Electro-Optical Modulator (EOM), a Magneto-Optic Modulator (MMO), or an Acousto-Optic Modulator (AOM). The present invention is not limited to the type or form of the light valve 60. The detailed steps and implementation of the method by which the light valve 60 converts the illumination light beam LB into the image light beam LI can be sufficiently taught, suggested, and explained by those skilled in the art, and thus will not be further described. In this embodiment, there is only one light valve 60, for example, in a projection device 10 using a single DMD. However, in other embodiments, there may be multiple light valves, and the present invention is not limited thereto.

[0047] The projection lens 70, for example, comprises a combination of one or more optical lenses having a refractive power, such as various combinations of non-planar lenses, such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 70 may also comprise a planar optical lens to reflect the image beam LI from the light valve 60 toward the projection target. The present invention is not limited to the type and form of the projection lens 70.

[0048] Figure 2 This is a schematic diagram of a lighting system according to an embodiment of the present invention. Figure 1 and Figure 2 . Figure 2 The lighting system 100 shown is applicable to at least Figure 1 In the projection device 10 shown. In this embodiment, the illumination system 100 includes a light source device 110, a light homogenizing element 120, and a polarizing element 130. Specifically, the illumination system 100 in this embodiment further includes a light guide device 140, a diffuser 150, a light focusing element 160, and a lens 170.

[0049] The light source device 110 is configured to provide a first light beam L1, a second light beam L2, a third light beam L3, and a first compensation light beam L4. Specifically, in this embodiment, the light source device 110 includes a first laser light source 112, a second laser light source 114, a third laser light source 116, and a first compensation light source 118. The first laser light source 112 is configured to provide the first light beam L1, the second laser light source 114 is configured to provide the second light beam L2, the third laser light source 116 is configured to provide the third light beam L3, and the first compensation light source 118 is configured to provide the first compensation light beam L4. The first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam L4 are emitted from the light source device 110 in the same direction.

[0050] For example, in this embodiment, the light source device 110 is a multi-color laser (MCL) module, the first laser light source 112 is a red laser diode, the second laser light source 114 is a blue laser diode, the third laser light source 116 is a green laser diode, and the first compensation laser light source 118 is a red laser diode. However, the present invention is not limited to this embodiment. Therefore, the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam L4 are red, blue, green, and red, respectively.

[0051] In this embodiment, the first light beam L1 and the first compensation light beam L4 have the same polarization state, while the second light beam L2 and the third light beam L3 have the same polarization state but are different from the polarization states of the first light beam L1 and the first compensation light beam L4. For example, the polarization state of the first light beam L1 and the first compensation light beam L4 is both P-polarized linear polarization (or P polarization), while the polarization state of the second light beam L2 and the third light beam L3 is both S-polarized linear polarization (or S polarization).

[0052] The light homogenizer 120 is disposed in the transmission path of the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam L4, and is used to transform the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam L4 into an illumination light beam LB. The light homogenizer 120 is used to adjust the spot shape of the light beam so that the spot shape of the light beam matches the shape of the working area of ​​the light valve 60 (e.g., a rectangle) and ensures that the light intensity at all locations in the spot is consistent or similar, thereby uniformizing the light intensity of the light beam. In this embodiment, the light homogenizer 120 is, for example, an integrating rod. However, in other embodiments, the light homogenizer 120 may also be other suitable optical elements, such as a lens array (a fly-eye lens array), but the present invention is not limited thereto.

[0053] The light guiding device 140 is disposed on the transmission paths of the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam L4, and is used to guide the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam L4. In this embodiment, the light guiding device 140 includes a reflective element 142, a beam splitter 144, and a semi-reflective element 146. The reflective element 142 is disposed on the transmission paths of the first light beam L1 and the first compensation light beam L4, and is used to reflect the first light beam L1 and the first compensation light beam L4 onto different transmission paths, respectively. The beam splitter 144 is disposed on the transmission path of the second light beam L2. The beam splitter 144 is, for example, a DMB (Dichroic Mirror with Blue Reflection) to reflect the second light beam L2 and allow the first light beam L1 to pass through. The semi-reflective element 146 is disposed in the transmission path of the third light beam L3. The semi-reflective element 146 is, for example, a half mirror with green and blue (HMGB) and is configured to reflect a portion of the second light beam L2 and a portion of the third light beam L3, while allowing another portion of the second light beam L2 and another portion of the third light beam L3 to pass through. For example, the semi-reflective element 146 reflects 50% of the second light beam L2 and 50% of the third light beam L3, while allowing another 50% of the second light beam L2 and another 50% of the third light beam L3 to pass through.

[0054] The diffusion device 150 is disposed on the transmission path of the second light beam L2 and the third light beam L3 to diffuse the second light beam L2 and the third light beam L3. The diffusion device 150 is, for example, a diffuser or a rotating wheel with a diffusion sheet, but the present invention is not limited thereto.

[0055] The polarization element 130 is used to change the polarization state of the light beam. The polarization element 130 is disposed on the transmission path of the first light beam L1 and the first compensation light beam L4, and is located between the light source device 110 and the light homogenizing element 120. Specifically, in this embodiment, the polarization element 130 is disposed between the light source device 110 and the light guide device 140, as shown in FIG. Figure 2 In this embodiment, the polarization element 130 includes a half-wave plate and is only disposed on the transmission path of the first light beam L1 and the first compensation light beam L4. In other words, the second light beam L2 and the third light beam L3 do not pass through the polarization element 130.

[0056] Therefore, after the first light beam L1 and the first compensation beam L4 pass through the polarization element 130, the P-polarized first light beam L1 and the P-polarized first compensation beam L4 are converted by the polarization element 130 into the S-polarized first light beam L1 and the S-polarized first compensation beam L4. In other words, the polarization states of the first light beam L1 and the first compensation beam L4 are changed to the same as the polarization states of the second light beam L2 and the third light beam L3 after the first light beam L1 and the first compensation beam L4 pass through the polarization element 130. In other words, the polarization states of the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation beam L4 are all the same (i.e., all are S-polarized) when they pass into the light homogenizing element 120. In this way, the polarization states of all light beams can be unified to improve color uniformity.

[0057] Furthermore, it's worth noting that converting a P-polarized beam into an S-polarized beam in this embodiment offers advantages over converting an S-polarized beam into a P-polarized beam. Specifically, the half-wave plate in polarization element 130 has a certain degree of light absorption. Since the primary brightness of illumination system 100 is provided by the third beam L3, which is green light, using polarization element 130 to convert the polarization states of first beam L1 and first compensation beam L4 while avoiding converting the polarization state of third beam L3 will result in better brightness for illumination system 100 and maintain a good optical effect.

[0058] In another embodiment, the polarization element 130 may be a twisted nematic (TN) liquid crystal device instead of a half-wave plate to convert the P-polarized first light beam L1 and the P-polarized first compensation light beam L4 into the S-polarized first light beam L1 and the S-polarized first compensation light beam L4, but the present invention is not limited thereto.

[0059] Figure 3 This is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 3 The lighting system 100A of this embodiment is similar to Figure 2 The difference between the two embodiments is that, in this embodiment, the polarization element 130A comprises a quarter-wave plate or a depolarizer and is repositioned between the light guide 140 and the light homogenizing element 120. Therefore, the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam L4 guided by the light guide 140 will simultaneously pass through the polarization element 130A. In other words, the second light beam L2 and the third light beam L3 are changed in polarization state by passing through the polarization element 130A.

[0060] Specifically, when the polarization element 130A is a quarter-wave plate, the P-polarized first light beam L1, the S-polarized second light beam L2, the S-polarized third light beam L3, and the P-polarized first compensation light beam L4 are converted through the polarization element 130A into the circularly polarized first light beam L1, the circularly polarized second light beam L2, the circularly polarized third light beam L3, and the circularly polarized first compensation light beam L4. Therefore, the polarization states of the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam L4 are all the same (i.e., all circularly polarized) when they enter the light homogenizing element 120. On the other hand, when the polarization element 130A is a depolarizer, the P-polarized first light beam L1, the S-polarized second light beam L2, the S-polarized third light beam L3, and the P-polarized first compensation light beam L4 are converted through the polarization element 130A into the unpolarized first light beam L1, the unpolarized second light beam L2, the unpolarized third light beam L3, and the unpolarized first compensation light beam L4. Therefore, the polarization states of the first light beam L1 , the second light beam L2 , the third light beam L3 and the first compensation light beam L4 when they enter the light homogenizing element 120 are all the same (ie, all are unpolarized).

[0061] In this way, the polarization states of all light beams can be unified to improve color uniformity. In another embodiment, the polarization element 130A can be a twisted nematic liquid crystal device instead of a quarter wave plate or a depolarizer to achieve the same effect, but the present invention is not limited thereto.

[0062] Figure 4 This is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 4 The lighting system 100B of this embodiment is similar to Figure 2 The difference between the two is that, in this embodiment, the number of the light source device 110 and the polarization element 130 are both two, the two light source devices 110 are placed perpendicular to each other, and the two polarization elements 130 are respectively arranged on the transmission paths of the first light beam L1 and the first compensation light beam L4 in the two light source devices 110, as shown in FIG. Figure 4 In addition, the light guide device 140A includes a first light splitting element 144A, a second light splitting element 144B and a semi-reflective element 146. The first light splitting element 144A is configured Figure 4 The second light beam L2 and the third light beam L3 emitted by the light source device 110 shown above and Figure 4The first beam L1 and the first compensation beam L4 emitted by the light source device 110 shown on the right are transmitted along the transmission path. The first beam splitter 144A is, for example, a red reflection dichroic mirror (DMR), which is used to reflect the first beam L1 and the first compensation beam L4 and allow the second beam L2 and the third beam L3 to pass through. The second beam splitter 144B is disposed at Figure 4 The first light beam L1 and the first compensation light beam L4 emitted by the light source device 110 shown above are Figure 4 The figure shows the transmission paths of the second light beam L2 and the third light beam L3 emitted by the light source device 110 on the right. The second beam splitter 144B is, for example, a dichroic mirror with blue and green reflection (DMBG), which is used to reflect the second light beam L2 and the third light beam L3 and allow the first light beam L1 and the first compensation beam L4 to pass through.

[0063] Therefore, after the first light beam L1 and the first compensation light beam L4 of the two light source devices 110 pass through the two polarization elements 130, the two first light beams L1 and the two first compensation light beams L4 are converted from P polarization to S polarization by the polarization elements 130. This makes the polarization states of the first light beam L1 and the first compensation light beam L4 the same as the polarization states of the second light beam L2 and the third light beam L3. In this way, the polarization states of all light beams can be unified to improve color uniformity.

[0064] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the lighting system and projection device of the present invention, the light source device provides a first light beam, a second light beam, a third light beam, and a first compensation light beam, and a polarization element is configured for the first light beam and the first compensation light beam so that the first light beam and the first compensation light beam are transmitted through the polarization element, thereby changing the polarization state of the first light beam and the first compensation light beam to be the same as the polarization state of the second light beam and the third light beam. Therefore, the polarization state of the first light beam, the second light beam, the third light beam, and the first compensation light beam are all the same when they are transmitted into the light homogenizing element. In this way, the polarization state of all light beams can be unified to improve color uniformity.

[0065] The above description is only a preferred embodiment of the present invention, and it cannot be used to limit the scope of implementation of the present invention. All simple equivalent changes and modifications made according to the claims and the contents of the invention of the present invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and the title of the invention are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or to distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

Claims

1. A lighting system, characterized in that: The lighting system includes a first light source device, a second light source device, a first polarization element, and a second polarization element. The first light source device and the second light source device are multi-color laser modules, wherein: The first light source device is used to provide a first light beam, a second light beam, a third light beam and a first compensation light beam; The second light source device is used to provide a fourth light beam, a fifth light beam, a sixth light beam and a second compensation light beam; The first polarization element is disposed on a transmission path of the first light beam and the first compensation light beam; and The second polarization element is arranged on the transmission path of the fourth light beam and the second compensation light beam, wherein the first light beam and the first compensation light beam have the same polarization state, the second light beam and the third light beam have the same polarization state and are different from the polarization states of the first light beam and the first compensation light beam before passing through the first polarization element, and the first light beam and the first compensation light beam pass through the first polarization element so that the polarization states of the first light beam and the first compensation light beam are changed to be the same as the polarization states of the second light beam and the third light beam; The fourth light beam and the second compensation light beam have the same polarization state, the fifth light beam and the sixth light beam have the same polarization state and are different from the polarization state of the fourth light beam and the second compensation light beam before passing through the second polarization element. When the fourth light beam and the second compensation light beam pass through the second polarization element, the polarization state of the fourth light beam and the second compensation light beam changes to the same polarization state as the fifth light beam and the sixth light beam.

2. The lighting system according to claim 1, wherein The first light beam and the fourth light beam have the same color, and the first compensation light beam and the second compensation light beam have the same color.

3. The lighting system according to claim 1, wherein The second light beam has the same color as the fifth light beam, and the third light beam has the same color as the sixth light beam.

4. The lighting system according to claim 1, wherein The lighting system further includes a light guide device. On the transmission path of the first light beam and the first compensation light beam, the first polarization element is disposed between the first light source device and the light guide device.

5. The lighting system according to claim 4, characterized in that The light guiding device includes a first light splitting element and a second light splitting element.

6. The lighting system according to claim 5, characterized in that The first beam splitter is disposed on the transmission paths of the second light beam and the third light beam, and is used to reflect the fourth light beam and the second compensation light beam and allow the second light beam and the third light beam to pass through.

7. The lighting system according to claim 5, characterized in that The second beam splitter is disposed on a transmission path of the first light beam and the first compensation light beam, and is configured to reflect the fifth light beam and the sixth light beam and allow the first light beam and the second compensation light beam to pass through.

8. The lighting system according to claim 5, characterized in that The light-guiding device also includes a semi-reflective element, which is arranged on the transmission path of the second light beam and the third light beam, and is used to reflect a part of the second light beam and a part of the third light beam, and allow another part of the second light beam and another part of the third light beam to pass through, and reflect a part of the fifth light beam and a part of the sixth light beam, and allow another part of the fifth light beam and another part of the sixth light beam to pass through.

9. The lighting system according to claim 4, characterized in that It also includes a light uniformity element, and the light guiding device is located between the first light source device and the light uniformity element.

10. The lighting system according to claim 9, characterized in that The lighting system further includes a diffusion device, which is located between the light guiding device and the light uniforming element.

11. The lighting system according to claim 1, wherein The first polarization element and the second polarization element include any one of a half wave plate, a depolarizer, or a twisted nematic liquid crystal device.

12. A projection device, characterized in that: The projection device includes an illumination system, at least one light valve and a projection lens, wherein: The lighting system is used to provide an illumination beam, and includes a first light source device, a second light source device, a first polarization element, and a second polarization element. The first light source device and the second light source device are multi-color laser modules, wherein: The first light source device is used to provide a first light beam, a second light beam, a third light beam and a first compensation light beam; The second light source device is used to provide a fourth light beam, a fifth light beam, a sixth light beam and a second compensation light beam; The first polarization element is disposed on a transmission path of the first light beam and the first compensation light beam; and The second polarization element is arranged on the transmission path of the fourth light beam and the second compensation light beam, wherein the first light beam and the first compensation light beam have the same polarization state, the second light beam and the third light beam have the same polarization state and are different from the polarization states of the first light beam and the first compensation light beam before passing through the first polarization element, and the first light beam and the first compensation light beam pass through the first polarization element so that the polarization states of the first light beam and the first compensation light beam are changed to be the same as the polarization states of the second light beam and the third light beam; wherein the fourth light beam and the second compensation light beam have the same polarization state, the fifth light beam and the sixth light beam have the same polarization state and are different from the polarization states of the fourth light beam and the second compensation light beam before passing through the second polarization element, and the fourth light beam and the second compensation light beam pass through the second polarization element so that the polarization states of the fourth light beam and the second compensation light beam are changed to be the same as the polarization states of the fifth light beam and the sixth light beam; The at least one light valve is disposed on a transmission path of the illumination light beam, and is used to convert the illumination light beam into an image light beam; and The projection lens is disposed on the transmission path of the image light beam and is used for projecting the image light beam out of the projection device.

13. The projection device according to claim 12, wherein: The first light beam and the fourth light beam have the same color, and the first compensation light beam and the second compensation light beam have the same color.

14. The projection device according to claim 12, wherein: The second light beam has the same color as the fifth light beam, and the third light beam has the same color as the sixth light beam.

15. The projection device according to claim 12, wherein: The lighting system further includes a light guide device. On the transmission path of the first light beam and the first compensation light beam, the first polarization element is disposed between the first light source device and the light guide device.

16. The projection device according to claim 15, wherein: The light guiding device includes a first light splitting element and a second light splitting element.

17. The projection device according to claim 16, wherein: The first beam splitter is disposed on the transmission paths of the second light beam and the third light beam, and is used to reflect the fourth light beam and the second compensation light beam and allow the second light beam and the third light beam to pass through.

18. The projection device according to claim 16, wherein: The second beam splitter is disposed on a transmission path of the first light beam and the first compensation light beam, and is configured to reflect the fifth light beam and the sixth light beam and allow the first light beam and the first compensation light beam to pass through.

19. The projection device according to claim 16, wherein: The light-guiding device also includes a semi-reflective element, which is arranged on the transmission path of the second light beam and the third light beam, and is used to reflect a part of the second light beam and a part of the third light beam, and allow another part of the second light beam and another part of the third light beam to pass through, and reflect a part of the fifth light beam and a part of the sixth light beam, and allow another part of the fifth light beam and another part of the sixth light beam to pass through.

20. The projection device according to claim 15, wherein: It also includes a light uniformity element, and the light guiding device is located between the first light source device and the light uniformity element.

21. The projection device according to claim 20, wherein: The lighting system further includes a diffusion device, which is located between the light guiding device and the light uniforming element.

22. The lighting system according to claim 12, wherein: The first polarization element and the second polarization element include any one of a half wave plate, a depolarizer, or a twisted nematic liquid crystal device.

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