Laser light source and projection equipment

Abstract

The utility model relates to the field of laser, and discloses a laser light source and projection equipment. The laser light source comprises three laser devices, the light-emitting surface of each laser device comprises a first light-emitting area, a second light-emitting area, a third light-emitting area and a fourth light-emitting area which are sequentially and adjacently arranged, and the first light-emitting area and the second light-emitting area are both used for emitting linear polarization laser of a first wavelength in a first polarization direction; the third light emitting area is used for emitting linearly polarized laser of a second wavelength in a second polarization direction, and the fourth light emitting area is used for emitting linearly polarized laser of a third wavelength in the second polarization direction; the second polarization direction is perpendicular to the first polarization direction; and the light combining assembly is located on the light emitting sides of the three lasers and used for carrying out polarization light combining on the lasers with the same wavelength emitted by the different light emitting areas in the three lasers and carrying out wavelength light combining on the lasers with different wavelengths. Through combination of polarization light combination and wavelength light combination, the light spot area after light combination is small, and the size of the projection equipment can be further reduced.

Description

Technical Field

[0001] The present application relates to the field of laser technology, and in particular to a laser light source and projection equipment. Background Art

[0002] Projection display technology is a visual presentation method that converts images or video signals into visible light and shadows and projects them onto a flat screen or other surface. Laser light sources have the advantages of high color gamut and high brightness compared to other light sources, making them increasingly widely used in the projection field. Currently, mainstream laser applications have evolved from monochromatic lasers to tri-color lasers. Due to current laser design limitations, a single laser cannot meet usage requirements, and at least two lasers are required to combine the light. Due to the limitations of the laser chip layout, combining the light of three lasers is prone to problems such as large spot size and uneven spot distribution. Utility Model Content

[0003] In a first aspect, an embodiment of the present application provides a laser light source, comprising:

[0004] Three lasers, each of the lasers having a light-emitting surface comprising a first light-emitting area, a second light-emitting area, a third light-emitting area, and a fourth light-emitting area that are adjacent to each other in sequence, the first light-emitting area and the second light-emitting area being configured to emit linearly polarized laser light of a first wavelength in a first polarization direction, the third light-emitting area being configured to emit linearly polarized laser light of a second wavelength in a second polarization direction, and the fourth light-emitting area being configured to emit linearly polarized laser light of a third wavelength in the second polarization direction; the second polarization direction being perpendicular to the first polarization direction;

[0005] The light combining component is located on the light output side of the three lasers and is used for polarization combining lasers of the same wavelength emitted from different light output areas of the three lasers, and is also used for wavelength combining lasers of different wavelengths.

[0006] In a second aspect, an embodiment of the present application further provides a projection device, comprising an illumination assembly, a projection lens, and a laser light source as described in any one of the first aspects; the projection lens is located on a light-emitting side of the illumination assembly;

[0007] The lighting system comprises:

[0008] a diffuser, located on the light-emitting side of the light-combining assembly;

[0009] a tenth phase delay element, located between the light-combining assembly and the diffuser; the tenth phase delay element is used to generate a phase delay of π on the received first laser beam and emit it toward the diffuser, the polarization direction of the laser beam received by the diffuser and emitted through the tenth phase delay element being perpendicular to the polarization direction of the second laser beam; the first laser beam is the laser beam emitted from the light-combining assembly and emitted toward the diffuser through the tenth phase delay element, and the second laser beam is the laser beam emitted directly from the light-combining assembly toward the diffuser;

[0010] a beam reduction lens group, located on the side of the diffuser away from the light combining assembly, the beam reduction lens group comprising a focusing lens and a collimating lens sequentially arranged along the optical path;

[0011] a first compound eye, located between the beam reduction lens group and the diffuser;

[0012] a diffusion wheel, located at the focal plane of the beam reduction lens group;

[0013] a second compound eye, located on a side of the beam reduction lens group away from the diffuser;

[0014] The light modulator is located on a side of the second compound eye away from the diffuser.

[0015] The laser light source and projection device provided in the embodiments of the present application realize the light combining of three lasers through a light combining module, wherein: the light emitting surface of each laser includes a first light emitting area, a second light emitting area, a third light emitting area and a fourth light emitting area arranged adjacent to each other in sequence; the first light emitting area and the second light emitting area are both used to emit a linearly polarized laser of a first wavelength in a first polarization direction, such as the first light emitting area and the second light emitting area are both used to emit red light in a P-polarized state; the third light emitting area is used to emit a linearly polarized laser of a second wavelength in a second polarization direction, such as the third light emitting area is used to emit blue light in an S-polarized state; the fourth light emitting area is used to emit a linearly polarized laser of a third wavelength in a second polarization direction, such as the fourth light emitting area is used to emit green light in an S-polarized state; wherein the laser in the P-polarized state and the laser in the S-polarized state have orthogonal polarization states. The light combining module adopts a light combining method that combines polarization light combining and wavelength light combining. In the polarization light combining, the two laser beams of the same wavelength have different polarization directions, which reduces the coherence of the laser beams of the same wavelength, can suppress speckle to a certain extent, and can compress the light combining spot size of the first wavelength laser; wavelength light combining makes the light spots in different light emitting areas overlap as much as possible and are evenly distributed. The laser light source provided in the embodiment of the present application combines polarization light combining with wavelength light combining, so that the spot area after light combining is smaller. Since the size of the light combining spot will affect the size of the subsequent lighting components, reducing the size of the light combining spot can further reduce the volume of the projection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A schematic structural diagram of a projection system provided in an embodiment of the present application;

[0017] Figure 2 This is one of the structural schematic diagrams of a laser light source provided in an embodiment of the present application;

[0018] Figure 3 A schematic diagram of the structure of a laser provided in an embodiment of the present application;

[0019] Figure 4 for Figure 3 Schematic diagram of the laser spot;

[0020] Figure 5 For related technologies Figure 3 The combined light path diagram of the laser in the middle;

[0021] Figure 6 for Figure 5 Schematic diagram of the combined light spot in the combined light path;

[0022] Figure 7 This is one of the structural schematic diagrams of the laser light source provided in the embodiment of the present application;

[0023] Figure 8 The second structural diagram of the laser light source provided in the embodiment of the present application;

[0024] Figure 9 for Figure 7 and Figure 8 Schematic diagram of the combined light spot in the combined light path;

[0025] Figure 10 The third structural diagram of the laser light source provided in the embodiment of the present application;

[0026] Figure 11 for Figure 10 Schematic diagram of the combined light spot in the combined light path;

[0027] Figure 12 for Figure 10 A schematic structural diagram of the first light combining unit 220;

[0028] Figure 13 for Figure 10 A schematic structural diagram of the first component 231;

[0029] Figure 14 for Figure 10 A schematic structural diagram of the second component 232;

[0030] Figure 15 This is a fourth structural diagram of a laser light source provided in an embodiment of the present application;

[0031] Figure 16 for Figure 15A schematic structural diagram of the second phase delay element;

[0032] Figure 17 for Figure 15 A schematic structural diagram of the third phase delay element;

[0033] Figure 18 for Figure 15 Schematic diagram of the structure of the third wavelength optical combiner;

[0034] Figure 19 for Figure 15 A schematic structural diagram of the fourth phase delay element;

[0035] Figure 20 for Figure 15 A schematic structural diagram of the second polarization light combiner;

[0036] Figure 21 for Figure 15 Schematic diagram of the combined light spot in the combined light path;

[0037] Figure 22 The fifth structural diagram of the laser light source provided in the embodiment of the present application;

[0038] Figure 23 for Figure 22 A schematic structural diagram of the fifth phase delay element;

[0039] Figure 24 for Figure 22 A schematic structural diagram of the third polarization light combiner;

[0040] Figure 25 for Figure 22 Schematic diagram of the structure of the fourth wavelength optical combiner;

[0041] Figure 26 for Figure 22 Schematic diagram of the structure of the fifth wavelength optical combiner;

[0042] Figure 27 for Figure 22 Schematic diagram of the structure of the sixth wavelength optical combiner;

[0043] Figure 28 for Figure 22 Schematic diagram of the combined light spot in the combined light path;

[0044] Figure 29 The sixth structural diagram of the laser light source provided in the embodiment of the present application;

[0045] Figure 30 for Figure 29 Schematic diagram of the structure of the seventh phase delay element;

[0046] Figure 31 for Figure 29 A schematic structural diagram of the eighth phase delay element;

[0047] Figure 32 for Figure 29 A schematic structural diagram of the fifth polarization light combiner;

[0048] Figure 33 for Figure 29 A schematic structural diagram of the sixth polarization light combiner;

[0049] Figure 34 for Figure 29 Schematic diagram of the structure of the seventh wavelength optical combiner;

[0050] Figure 35 for Figure 29 Schematic diagram of the structure of the eighth wavelength optical combiner;

[0051] Figure 36 for Figure 29 Schematic diagram of the combined light spot in the combined light path;

[0052] Figure 37 The seventh structural diagram of the laser light source provided in the embodiment of the present application;

[0053] Figure 38 for Figure 37 A schematic structural diagram of the ninth phase delay element;

[0054] Figure 39 for Figure 37 A schematic structural diagram of the seventh polarization light combiner;

[0055] Figure 40 for Figure 37 Schematic diagram of the structure of the ninth wavelength optical combiner;

[0056] Figure 41 for Figure 37 Schematic diagram of the structure of the twelfth wavelength optical combiner;

[0057] Figure 42 for Figure 37 Schematic diagram of the combined light spot in the combined light path;

[0058] Figure 43 A schematic diagram of the structure of the projection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0060] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of this application, unless otherwise specified, "plurality" means two or more.

[0061] Projection display technology is a visual presentation method that converts images or video signals into visible light and shadows and projects them onto a flat screen or other surface. This technology is widely used in education, business presentations, home entertainment, and cinemas to create an immersive viewing experience for audiences.

[0062] Figure 1 This is a schematic diagram of the structure of the projection system provided in an embodiment of the present application.

[0063] like Figure 1 As shown, the projection system includes a projection device 1 and a projection screen 2. The projection screen 2 is located on the light-emitting side of the projection device 1. The audience faces the projection screen 2. The projection device 1 emits projection light, which is incident on the projection screen 2. After being reflected by the projection screen 2, the projection light enters the human eye, allowing the audience to see the projected image.

[0064] In some embodiments, the projection device 1 can adopt an ultra-short-throw laser projection device. The ultra-short-throw laser projection device has the characteristics of small projection distance and large projection screen, and is very suitable for application in the home field. In order to achieve better brightness and display effect, it can be used with the projection screen 2.

[0065] During projection, the light source is a key component of the projection device. To ensure higher brightness and wider color gamut coverage, the light beams emitted by three or more lasers are combined. Projection devices use three-color lasers as the light source, coupled into the compound eye. To reduce the size of the light source, some three-color lasers package the three-color light-emitting chips together. However, due to the limitations of the laser chip layout, the combined light of the three lasers can easily result in larger spot sizes and uneven spot distribution.

[0066] Based on the above application scenarios, the embodiments of the present application provide a laser light source and a projection device, which are used to reduce the size of the combined light spot on the basis of combining the light of three three-color lasers, thereby reducing the volume of the entire laser light source.

[0067] Figure 2 This is one of the structural schematic diagrams of a laser light source provided in an embodiment of the present application.

[0068] like Figure 2 As shown, the laser light source includes:

[0069] Three lasers 100, each laser 100 having a light-emitting surface including a first light-emitting area 101, a second light-emitting area 102, a third light-emitting area 103, and a fourth light-emitting area 104, which are adjacent to each other in sequence. The first light-emitting area 101 and the second light-emitting area 102 are both used to emit linearly polarized laser light of a first wavelength in a first polarization direction, the third light-emitting area 103 is used to emit linearly polarized laser light of a second wavelength in a second polarization direction, and the fourth light-emitting area 104 is used to emit linearly polarized laser light of a third wavelength in the second polarization direction; the second polarization direction is perpendicular to the first polarization direction.

[0070] The light combining component 200 is located at the light output side of the three lasers 100 and is used to perform polarization combining on lasers of the same wavelength emitted from different light output areas of the three lasers 100 , and is also used to perform wavelength combining on lasers of different wavelengths.

[0071] The above-mentioned laser light source realizes light combining of three lasers 100 through a light combining module, wherein: the light emitting surface of each laser 100 includes a first light emitting area 101, a second light emitting area 102, a third light emitting area 103 and a fourth light emitting area 104 arranged adjacent to each other in sequence; the first light emitting area 101 and the second light emitting area 102 are both used to emit linearly polarized laser light of a first wavelength in a first polarization direction, such as the first light emitting area 101 and the second light emitting area 102 are both used to emit red light in a P-polarized state; the third light emitting area 103 is used to emit linearly polarized laser light of a second wavelength in a second polarization direction, such as the third light emitting area 103 is used to emit blue light in an S-polarized state; the fourth light emitting area 104 is used to emit linearly polarized laser light of a third wavelength in a second polarization direction, such as the fourth light emitting area 104 is used to emit green light in an S-polarized state; wherein the laser light in the P-polarized state and the laser light in the S-polarized state have orthogonal polarization states. The light combining module 200 adopts a light combining method that combines polarization light combining and wavelength light combining. In the polarization light combining, the two laser beams of the same wavelength have different polarization directions, which reduces the coherence of the laser beams of the same wavelength, can suppress speckle to a certain extent, and can compress the light combining spot size of the first wavelength laser; wavelength light combining makes the light spots in different light emitting areas overlap as much as possible and are evenly distributed. The laser light source provided in the embodiment of the present application combines polarization light combining with wavelength light combining, so that the spot area after light combining is smaller. Since the size of the light combining spot will affect the size of the subsequent lighting components, reducing the size of the light combining spot can further reduce the volume of the projection equipment.

[0072] Figure 3 This is a schematic diagram of the structure of the laser provided in the embodiment of the present application. Figure 4 for Figure 3 Schematic diagram of the laser spot.

[0073] like Figure 3 As shown, the laser 100 includes a substrate, on which a plurality of light-emitting chips are packaged. The laser 100 is further provided with a collimating lens group near the light-emitting surface. The laser emitted by the light-emitting chip is collimated by the collimating lens group and then emitted from the light-emitting surface. The light-emitting surface of the laser 100 has multiple light-emitting areas, and the light beams emitted from different light-emitting areas have different colors. In some embodiments, the light-emitting surface of the laser 100 includes a first light-emitting area 101, a second light-emitting area 102, a third light-emitting area 103 and a fourth light-emitting area 104. The first light-emitting area 101 and the second light-emitting area 102 correspond to light-emitting chips that emit a first wavelength laser, such as a red laser, the third light-emitting area 103 corresponds to a light-emitting chip that emits a second wavelength laser, such as a blue laser, and the fourth light-emitting area 104 corresponds to a light-emitting chip that emits a third wavelength laser, such as a green laser. For example, as Figure 3 and Figure 4As shown, the first light emitting area 101 and the second light emitting area 102 correspond to two rows of red laser chips, forming two rows of red light spots; the third light emitting area 103 corresponds to a row of blue laser chips, forming a row of blue light spots; the fourth light emitting area 104 corresponds to a row of green laser chips, forming a row of green light spots; that is, the laser 100 in this embodiment is a 4×7 light emitting array. In this embodiment, the laser 100 encapsulates the three-color light emitting chips in the same module, which is smaller in size and helps to reduce the volume of the light source device. Figure 4 As shown, the light spots are all elliptical patterns, the long axis direction of the ellipse is called the fast axis direction of the laser, and the short axis direction of the ellipse is called the slow axis direction of the laser.

[0074] Figure 5 For related technologies Figure 3 The combined light path diagram of the laser, Figure 6 for Figure 5 Schematic diagram of the combined light spot in the combined light path.

[0075] like Figure 5 and Figure 6 As shown, due to the limitations of the light-emitting chip arrangement, the light from each light-emitting area of ​​a laser 100 is combined to form three rows of combined light spots in the far field, of which there are two rows of red light spots R, with a gap between the two rows of red light spots R. Using this light-combining method, the light from three lasers 100 is combined to form six rows of red light spots. The combined light spots are larger in area, which leads to an increase in the size of the lighting components behind the light source, and thus increases the volume of the entire projection device.

[0076] Figure 7 This is one of the structural schematic diagrams of the laser light source provided in the embodiment of the present application; Figure 8 The second structural diagram of the laser light source provided in the embodiment of the present application; Figure 9 for Figure 7 and Figure 8 Schematic diagram of the combined light spot in the combined light path.

[0077] In some embodiments, as Figure 7 and Figure 8 As shown, the light combining assembly includes three light combining units 210, and a light combining unit 210 is correspondingly provided on the light output side of each laser;

[0078] The light combining unit 210 includes a first phase delay element 211, a first reflector 212, a first polarization light combining element 213, a first wavelength light combining element 214 and a second wavelength light combining element 215; the first reflector 212 is used to receive the laser light of the first polarization direction emitted from the first light emitting area and reflect it to the first polarization light combining element 213; the first phase delay element 211 is used to generate a phase delay of π for the laser light of the first polarization direction emitted from the second light emitting area, and emit the laser light of the second polarization direction to the first polarization light combining element 213; the first polarization light combining element 213 is used to receive the laser light of the first polarization direction emitted from the second light emitting area and reflect it to the first polarization light combining element 213; the first polarization light combining element 213 is used to receive the laser light of the first polarization direction emitted from the second light emitting area and emit the laser light of the second polarization direction to the first polarization light combining element 213. The laser light with the first polarization direction from the first reflective element 212 and the laser light with the second polarization direction from the first phase delay element 211 are polarization-combined and emitted to the first wavelength combining element 214; the first wavelength combining element 214 is used to wavelength-combine the first wavelength laser light from the first polarization combining element 213 and the second wavelength laser light emitted from the third light output area and emit them to the second wavelength combining element 215; the second wavelength combining element 215 is used to wavelength-combine the laser light from the first wavelength combining element 214 and the third wavelength laser light emitted from the fourth light output area.

[0079] like Figure 7 and Figure 8 As shown, in the one-to-one correspondence between the laser and the light combining unit 210, the laser includes a first light emitting area 101, a second light emitting area 102, a third light emitting area 103 and a fourth light emitting area 104 arranged in sequence along the first direction. The first light emitting area 101 and the second light emitting area 102 emit first polarized light of a first wavelength, the third light emitting area 103 emits second polarized light of a second wavelength, and the fourth light emitting area 104 emits second polarized light of a third wavelength. The first polarized light is P polarized light, and the second polarized light is S polarized light. The polarization direction of the P polarized light is parallel to the incident plane, and the polarization direction of the S polarized light is perpendicular to the incident plane. The light combining unit 210 includes a first phase delay element 211 and a first reflective element 212, a first polarization light combining element 213, a first wavelength light combining element 214 and a second wavelength light combining element 215 arranged in sequence along the first direction.

[0080] The first phase delay element 211 is located on the light-emitting side of the second light-emitting region 102 of the laser. When P-polarized light of the first wavelength is incident on the first phase delay element 211, the first phase delay element 211 generates a phase delay of π for the received P-polarized light of the first wavelength and emits S-polarized light of the first wavelength along the first direction. Exemplarily, the first phase delay element 211 is a wave plate.

[0081] The first reflector 212 is located at the light-emitting side of the first light-emitting area 101 in the laser, and reflects the P-polarized light of the first wavelength emitted from the first light-emitting area 101 and emits it in the first direction.

[0082] The first polarization light combiner 213 is located at the intersection of the laser light emitted by the first reflector 212 and the laser light emitted by the first phase delay element 211. The first polarization light combiner 213 can transmit P-polarized light and reflect S-polarized light, so as to polarize-combine the P-polarized light of the first wavelength received from the first reflector 212 and the S-polarized light of the first wavelength from the first phase delay element 211 and emit them along the first direction. Since the P-polarized light of the first wavelength and the S-polarized light of the first wavelength have different polarization directions, the conditions for the interference of the laser light of the first wavelength are destroyed, the strong interference between the lasers is avoided, and the problem of laser speckle is improved. Exemplarily, the first polarization light combiner 213 is a red polarization light combiner.

[0083] The first wavelength combiner 214 is located at the intersection of the laser light emitted by the first polarization combiner 213 and the laser light emitted by the third light output area 103 of the laser. The first wavelength combiner 214 transmits the first wavelength laser light and reflects the second wavelength laser light, thereby combining the first wavelength laser light received from the first polarization combiner 213 with the second wavelength laser light received from the third light output area 103 and emitting the combined light in the first direction. Exemplarily, the first wavelength combiner 214 is a dichroic film or a dichroic mirror.

[0084] The second wavelength combiner 215 is located at the intersection of the laser light emitted by the first wavelength combiner 214 and the laser light emitted by the fourth light output area 104 of the laser. The second wavelength combiner 215 transmits the first wavelength laser light and the second wavelength laser light and reflects the third wavelength laser light, thereby combining the first wavelength laser light and the second wavelength laser light received from the first wavelength combiner 214 with the third wavelength laser light from the fourth light output area 104, and emitting the combined light in the first direction. Exemplarily, the second wavelength combiner 215 is a dichroic film or a dichroic mirror.

[0085] like Figure 9 As shown, the laser light source provided in this embodiment forms three rows of combined light spots L in the far field. After combining, each row of combined light spots L contains two rows of red light spots R, one row of blue light spots B, and one row of green light spots G, showing a symmetrical and uniform distribution. Thus, this embodiment realizes light combining along the fast axis of the laser, reduces the size of the entire far field light spot, and the placement of the first wavelength light combining component 214 and the second wavelength light combining component 215 makes the light spot overlap as evenly distributed as possible. This embodiment adopts the method of combining polarized light and wavelength light to suppress speckle, reduce the area of ​​the combined light spot, optimize the illumination volume, and make the combined light spot evenly and symmetrically distributed, thereby improving optical efficiency.

[0086] In some embodiments, as Figure 7As shown, the three lasers are divided into a first laser 110, a second laser 120 and a third laser 130; the first laser 110 and the second laser 120 are arranged side by side along a first direction, and have the same light emitting direction; along the second direction, the third laser 130 is staggered with the first laser 110 and the second laser 120, and the light emitting direction of the third laser 130 is opposite to the light emitting direction of the first laser 110; wherein, the first direction is the arrangement direction of the first light emitting area 101, the second light emitting area 102, the third light emitting area 103 and the fourth light emitting area 104 in the first laser 110, and the second direction is perpendicular to the first direction; the first laser 110, the second laser 120 and the third laser 130 are staggered to prevent the lasers from being damaged by the transmitted light.

[0087] In some embodiments, as Figure 8 As shown, the three lasers are divided into a first laser 110, a second laser 120, and a third laser 130; the first laser 110 and the second laser 120 are arranged side by side and have the same light emission direction, and the third laser 130 is arranged perpendicular to the first laser 110, and the light emission direction of the third laser 130 is perpendicular to the light emission direction of the first laser 110; the light combining unit 210 corresponding to the third laser 130 also includes a second reflector 216, which is used to reflect the laser light from the second light combining unit 215 and emit the laser light along the first direction. The first direction is the arrangement direction of the first light emitting area 101, the second light emitting area 102, the third light emitting area 103, and the fourth light emitting area 104 in the first laser 110. In this embodiment, the third laser 130 is placed vertically, which is beneficial to the heat dissipation arrangement in the laser light source.

[0088] Figure 10 The third structural diagram of the laser light source provided in the embodiment of the present application; Figure 11 for Figure 10 Schematic diagram of the combined light spot in the combined light path.

[0089] In some embodiments, as Figure 10 As shown, the three lasers are divided into a first laser 110, a second laser 120 and a third laser 130; the first laser 110 and the third laser 130 are arranged side by side, and have the same light emission direction; the second laser 120 is arranged perpendicular to the first laser 110, and the light emission direction of the second laser 120 is perpendicular to the light emission direction of the first laser 110;

[0090] The light combining assembly 200 includes a first light combining unit 220 and a second light combining unit 230; the first light combining unit 220 is located at the intersection of the laser light emitted by the first laser 110 and the laser light emitted by the second laser 120; the second light combining unit 230 is located at the intersection of the laser light emitted by the second laser 120 and the laser light emitted by the third laser 130; in this embodiment, the light combining assembly 200 adopts wavelength combining, which is more efficient than polarization combining, such as Figure 11 As shown, the laser light source of this embodiment forms 6 rows of combined light spots L in the far field, which is suitable for scenes with large light spot requirements.

[0091] Figure 12 for Figure 10 Schematic diagram of the structure of the first light combining unit 220.

[0092] like Figure 12 As shown, the first light combining unit 220 includes a first light combining part 220a, a second light combining part 220b, a third light combining part 220c and a fourth light combining part 220d; the first light combining part 220a is used to reflect the first wavelength laser emitted from the first light emitting area of ​​the first laser 110, and is also used to transmit the third wavelength laser emitted from the fourth light emitting area of ​​the second laser 120, so as to wavelength combine the received first wavelength laser and third wavelength laser; the second light combining part 220b is used to reflect the first wavelength laser emitted from the second light emitting area of ​​the first laser 110, and is also used to transmit the second wavelength laser emitted from the third light emitting area of ​​the second laser 120. The first light combining unit 220a, the second light combining unit 220b, the third light combining unit 220c and the fourth light combining unit 220d are configured to reflect the second wavelength laser light emitted from the third light emitting area of ​​the first laser 110, and to transmit the first wavelength laser light emitted from the second light emitting area of ​​the second laser 120, so as to combine the received first wavelength laser light and the second wavelength laser light. The fourth light combining unit 220d is configured to reflect the third wavelength laser light emitted from the fourth light emitting area of ​​the first laser 110, and to transmit the first wavelength laser light emitted from the first light emitting area of ​​the second laser 120, so as to combine the received first wavelength laser light and the third wavelength laser light. The first light combining unit 220a, the second light combining unit 220b, the third light combining unit 220c and the fourth light combining unit 220d can be independent different structures, or different parts of the same structure. Illustratively, the first light-combining unit 220 is a zoned-coated dichroic film or a zoned-coated dichroic mirror; the first light-combining part 220a, the second light-combining part 220b, the third light-combining part 220c and the fourth light-combining part 220d are different areas of the first light-combining unit 220.

[0093] like Figure 10As shown, the second light combining unit 230 includes a first component 231 and a second component 232. The first component 231 is located on the light-emitting side of the first light-emitting area and the second light-emitting area in the third laser 130, and the second component 232 is located on the light-emitting side of the first component 231 and the third light-emitting area and the fourth light-emitting area in the third laser 130.

[0094] Figure 13 for Figure 10 A schematic structural diagram of the first component 231, Figure 14 for Figure 10 Schematic diagram of the structure of the second component 232.

[0095] like Figure 13 As shown, the first component 231 includes an upper portion 231a and a lower portion 231b, the upper portion 231a is used to reflect the first wavelength laser emitted from the second light emitting area in the third laser 130 and emit it along the first direction, the lower portion 231b is used to reflect the first wavelength laser emitted from the first light emitting area in the third laser 130 and emit it along the first direction, and the first direction is the arrangement direction of the first light emitting area, the second light emitting area, the third light emitting area and the fourth light emitting area in the third laser 130. The upper portion 231a and the lower portion 231b can be independent different structures, or different parts of the same structure. Exemplarily, the first component 231 is a reflective film or a reflective mirror or a dichroic film or a dichroic mirror; the upper portion 231a and the lower portion 231b are different areas of the first component 231. As shown Figure 14 As shown, the second component 232 includes a fifth light-combining unit 232a and a sixth light-combining unit 232b. The fifth light-combining unit 232a is used to transmit the first wavelength laser light emitted from the upper portion 231a and to reflect the third wavelength laser light emitted from the fourth light-exiting area of ​​the third laser 130, thereby combining the first wavelength laser light emitted from the second light-exiting area of ​​the third laser 130 with the third wavelength laser light emitted from the fourth light-exiting area, and emitting the combined light in a first direction. The sixth light-combining unit 232b transmits the first wavelength laser light emitted from the lower portion 231b and to reflect the second wavelength laser light emitted from the third light-exiting area of ​​the third laser 130, thereby combining the first wavelength laser light emitted from the first light-exiting area of ​​the third laser 130 with the second wavelength laser light emitted from the third light-exiting area, and emitting the combined light in the first direction. The fifth light-combining unit 232a and the sixth light-combining unit 232b can be independent and different structures, or they can be different parts of the same structure. Illustratively, the second component 232 is a dichroic film or a dichroic mirror; the fifth light-combining portion 232 a and the sixth light-combining portion 232 b are different regions of the second component 232 .

[0096] Figure 15 This is the fourth structural schematic diagram of the laser light source provided in the embodiment of the present application.

[0097] In some embodiments, as Figure 15As shown, the three lasers are divided into a first laser 110, a second laser 120 and a third laser 130; the first laser 110 and the third laser 130 are arranged side by side, and have the same light emission direction; the second laser 120 is arranged perpendicular to the first laser 110, and the light emission direction of the second laser 120 is perpendicular to the light emission direction of the first laser 110;

[0098] The light combining assembly 200 includes a first light combining unit 220 and a second light combining unit 230 ; the first light combining unit 220 is located at the intersection of the laser light emitted by the first laser 110 and the laser light emitted by the second laser 120 ; the second light combining unit 230 is located at the intersection of the laser light emitted by the second laser 120 and the laser light emitted by the third laser 130 .

[0099] The first light combining unit 220 includes a second phase delay element 221 , a third phase delay element 222 and a third wavelength combining element 223 ;

[0100] Figure 16 for Figure 15 Schematic diagram of the structure of the second phase delay element, Figure 17 for Figure 15 Schematic diagram of the structure of the third phase delay element, Figure 18 for Figure 15 Schematic diagram of the structure of the third wavelength optical combiner.

[0101] like Figure 16-18 As shown, the second phase delay element 221 includes a first portion 221a and a second portion 221b, the third phase delay element 222 includes a third portion 222b and a fourth portion 222a, and the third wavelength combiner 223 includes a first wavelength combiner 223a, a second wavelength combiner 223b, a third wavelength combiner 223c and a fourth wavelength combiner 223d. The first portion 221a and the second portion 221b can be two independent structures or two parts of the same structure. Exemplarily, the second phase delay element 221 is a half-wave plate, and the first portion 221a and the second portion 221b are different regions of the half-wave plate. The third portion 222b and the fourth portion 222a can be two independent structures or two parts of the same structure. Exemplarily, the third phase delay element 222 is a half-wave plate, and the third portion 222b and the fourth portion 222a are different regions of the half-wave plate. The first wavelength combining unit 223a, the second wavelength combining unit 223b, the third wavelength combining unit 223c, and the fourth wavelength combining unit 223d can be independent and different structures, or can be different parts of the same structure. Exemplarily, the third wavelength combining unit 223 is a dichroic film or a dichroic plate. The first wavelength combining unit 223a, the second wavelength combining unit 223b, the third wavelength combining unit 223c, and the fourth wavelength combining unit 223d are different regions of the dichroic film or the dichroic plate.

[0102] Combine Figure 15 The fourth portion 222a is located on the light-emitting side of the fourth light-emitting area in the second laser 120, and is used to generate a phase delay of π for the second polarization direction laser light emitted from the fourth light-emitting area, and emit the first polarization direction laser light to the first wavelength combining portion 223a; the first wavelength combining portion 223a is used to transmit the third wavelength laser light of the first polarization direction emitted by the fourth portion 222a, and reflect the first wavelength laser light of the first polarization direction emitted from the first light-emitting area in the first laser 110, so as to wavelength combine the laser light emitted from the first light-emitting area in the first laser 110 and the laser light emitted from the fourth portion 222a. ; The third part 222b is located on the light output side of the third light output area in the second laser 120, and is used to generate a phase delay of π for the second polarization direction laser emitted by the received third light output area, and emit the laser of the first polarization direction to the second wavelength combining part 223b; the second wavelength combining part 223b is used to transmit the second wavelength laser of the first polarization direction emitted by the third part 222b, and reflect the first wavelength laser of the first polarization direction emitted by the second light output area in the first laser 110, so as to wavelength combine the laser emitted by the second light output area in the received first laser 110 and the laser emitted by the third part 222b.

[0103] The first portion 221a is located on the light-emitting side of the third light-emitting area in the first laser 110, and is used to generate a phase delay of π for the second polarization direction laser light emitted by the third light-emitting area, and emit the second wavelength laser light of the first polarization direction to the third wavelength combining portion 223c; the third wavelength combining portion 223c is used to transmit the first wavelength laser light of the first polarization direction emitted by the second light-emitting area in the second laser 120, and is also used to reflect the second wavelength laser light of the first polarization direction emitted by the first portion 221a, so as to wavelength-combine the laser light emitted by the second light-emitting area in the second laser 120 and the laser light emitted by the first portion 221a; The second part 221b is located on the light-emitting side of the fourth light-emitting area in the first laser 110, and is used to generate a phase delay of π for the second polarization direction laser light emitted by the received fourth light-emitting area, and emit the third wavelength laser light of the first polarization direction to the fourth wavelength combining part 223d; the fourth wavelength combining part 223d is used to transmit the first wavelength laser light of the first polarization direction emitted by the first light-emitting area in the second laser 120, and is also used to reflect the third wavelength laser light of the first polarization direction emitted by the second part 221b, so as to wavelength combine the laser light emitted by the first light-emitting area in the received second laser 120 and the laser light emitted by the second part 221b.

[0104] The second light combining unit 230 includes a fourth phase delay element 233 and a second polarization light combining element 234;

[0105] Figure 19 for Figure 15 Schematic diagram of the structure of the fourth phase delay element, Figure 20 for Figure 15 Schematic diagram of the structure of the second polarization light combiner.

[0106] like Figure 19 and Figure 20 As shown, the fourth phase delay element 233 includes a fifth portion 233a and a sixth portion 233b, and the second polarization light combiner 234 includes a first polarization light combiner 234a, a second polarization light combiner 234b, a third polarization light combiner 234c, and a fourth polarization light combiner 234d; the fifth portion 233a and the sixth portion 233b can be two independent structures or two parts of the same structure. Exemplarily, the fourth phase delay element 233 is a half-wave plate, and the fifth portion 233a and the sixth portion 233b are different regions of the half-wave plate. The first polarization light combiner 234a, the second polarization light combiner 234b, the third polarization light combiner 234c, and the fourth polarization light combiner 234d can be independent different structures or different parts of the same structure. Illustratively, the second polarization light combiner 234 is a polarization light combiner, and the first polarization light combiner 234a, the second polarization light combiner 234b, the third polarization light combiner 234c and the fourth polarization light combiner 234d are different regions of the polarization light combiner.

[0107] The fifth part 233a is located on the light output side of the first light output area in the third laser 130, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the first light output area, and emit a second polarization direction laser light to the first polarization combining part 234a; the first polarization combining part 234a is used to transmit the first polarization direction laser light emitted from the first wavelength combining part 223a, and reflect the second polarization direction laser light emitted from the fifth part 233a, so as to polarize-combine the laser light emitted by the received fifth part 233a and the laser light emitted by the first wavelength combining part 223a; the sixth part 233b is located on the light output side of the second light output area in the third laser 130, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the second light output area, and emit a second polarization direction laser light to the second polarization combining part 234b; the second polarization combining part 234b is used to transmit the first polarization direction laser light emitted from the second wavelength combining part 223b direction, and reflects the laser of the second polarization direction emitted from the sixth part 233b, so as to polarize-combine the laser emitted by the received sixth part 233b and the laser emitted by the second wavelength combining part 223b; the third polarization combining part 234c is used to transmit the laser of the first polarization direction emitted from the third wavelength combining part 223c, and reflect the laser of the second polarization direction emitted from the third light emitting area in the third laser 130, so as to polarize-combine the laser emitted by the third light emitting area in the received third laser 130 and the laser emitted by the third wavelength combining part 223c; the fourth polarization combining part 234d is used to transmit the laser of the first polarization direction emitted from the fourth wavelength combining part 223d, and reflect the laser of the second polarization direction emitted from the fourth light emitting area in the third laser 130, so as to polarize-combine the laser emitted by the fourth light emitting area in the received third laser 130 and the laser emitted by the fourth wavelength combining part 223d.

[0108] In some embodiments, the second polarized light combiner 234 may be a red, green, and blue (RGB) polarized light combiner. Alternatively, the RGB polarized light combiner may have a coating on the upper portion for polarized red light combining and full transparency of blue and green light, and a coating on the lower portion for polarized blue and green light combining and full transparency of red light.

[0109] Figure 21 for Figure 15 Schematic diagram of the combined light spot in the combined light path.

[0110] like Figure 21As shown, the laser light source provided in this embodiment forms four rows of combined light spots L in the far field, wherein the first row of combined light spots L includes two rows of red light spots R and one row of green light spots G, and the three rows of spots are formed by overlapping. The second row of combined light spots L includes two rows of red light spots R and one row of blue light spots B, and the three rows of spots are formed by overlapping. The third row of combined light spots L includes one row of red light spots R and two rows of blue light spots B, and the three rows of spots are formed by overlapping. The fourth row of combined light spots L includes one row of red light spots R and two rows of green light spots G, and the three rows of spots are formed by overlapping. In this embodiment, only one wavelength combiner and one polarization combiner are used, and the optical path is simple and easier to adjust. This embodiment adopts the method of combining polarization combining with wavelength combining to suppress speckle, reduce the area of ​​the combined light spot, optimize the illumination volume, and make the combined light spots evenly and symmetrically distributed, thereby improving optical efficiency.

[0111] Figure 22 This is the fifth structural diagram of the laser light source provided in the embodiment of the present application.

[0112] In some embodiments, as Figure 22 As shown, the three lasers are divided into a first laser 110, a second laser 120 and a third laser 130; the first laser 110 and the third laser 130 are arranged in parallel, and the light emitting directions are opposite; the second laser 120 is arranged perpendicular to the first laser 110, and the light emitting direction of the second laser 120 is perpendicular to the light emitting direction of the first laser 110;

[0113] The light combining assembly 200 includes a fifth phase delay element 241, a sixth phase delay element 242, a third polarization light combining element 243, a fourth polarization light combining element 244, a fourth wavelength light combining element 245, a fifth wavelength light combining element 246 and a sixth wavelength light combining element 247;

[0114] Figure 23 for Figure 22 Schematic diagram of the structure of the fifth phase delay element, Figure 24 for Figure 22 Schematic diagram of the structure of the third polarization light combiner, Figure 25 for Figure 22 Schematic diagram of the structure of the fourth wavelength optical combiner, Figure 26 for Figure 22 Schematic diagram of the structure of the fifth wavelength optical combiner. Figure 27 for Figure 22 Schematic diagram of the structure of the sixth wavelength optical combiner.

[0115] like Figure 23-Figure 27As shown, the fifth phase delay element 241 includes a seventh portion 241a and an eighth portion 241b, the third polarization light combiner 243 includes a fifth polarization light combiner 243a and a sixth polarization light combiner 243b, the fourth wavelength light combiner 245 includes a fifth wavelength light combiner 245a and a sixth wavelength light combiner 245b, the fifth wavelength light combiner 246 includes a seventh wavelength light combiner 246a and an eighth wavelength light combiner 246b, and the sixth wavelength light combiner 247 includes a ninth wavelength light combiner 247a and a tenth wavelength light combiner 247b. The seventh portion 241a and the eighth portion 241b can be two independent structures or two parts of the same structure. Exemplarily, the fifth phase delay element 241 is a half-wave plate, and the seventh portion 241a and the eighth portion 241b are different regions of the half-wave plate. The fifth polarization light combiner 243a and the sixth polarization light combiner 243b can be two independent structures or two parts of the same structure. Exemplarily, the third polarization light combiner 243 is a polarization light combiner, and the fifth polarization light combiner 243a and the sixth polarization light combiner 243b are different regions of the polarization light combiner. The fifth wavelength light combiner 245a and the sixth wavelength light combiner 245b can be two independent structures or two parts of the same structure. Exemplarily, the fifth wavelength light combiner 245a and the sixth wavelength light combiner 245b are both dichroic plates, and the fourth wavelength light combiner 245 is an integral structure formed by splicing two dichroic plates, and the integral structure has an angle with an opening facing the second laser 120. The seventh wavelength light combiner 246a and the eighth wavelength light combiner 246b can be two independent structures or two parts of the same structure. Exemplarily, the seventh wavelength light combiner 246a and the eighth wavelength light combiner 246b are both dichroic plates, and the fifth wavelength light combiner 246 is an integral structure formed by splicing two dichroic plates, and the integral structure has an angle with an opening facing the second laser 120. The ninth wavelength combining unit 247a and the tenth wavelength combining unit 247b may be two independent structures or two parts of the same structure. For example, the sixth wavelength combining unit 247 is a dichroic film or a dichroic plate, and the ninth wavelength combining unit 247a and the tenth wavelength combining unit 247b are different regions of the dichroic film or the dichroic plate.

[0116] Combine Figure 22 The seventh portion 241a is located at the light-emitting side of the first light-emitting area in the first laser 110, and is used to generate a phase delay of π for the first polarization direction laser beam emitted by the first light-emitting area, and emit a second polarization direction laser beam to the fifth polarization light-combining portion 243a;

[0117] The fifth polarization combining unit 243a is configured to transmit the laser light of the first wavelength in the first polarization direction emitted by the first light emitting area of ​​the second laser 120, and reflect the laser light of the first wavelength in the second polarization direction emitted by the seventh unit 241a, so as to perform polarization combining on the laser light emitted by the seventh unit 241a and the laser light emitted by the first light emitting area of ​​the second laser 120, and emit the polarization-combined laser light to the fifth wavelength combining unit 245a.

[0118] The eighth portion 241b is located on the light-emitting side of the second light-emitting area in the first laser 110, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the second light-emitting area, and emit the second polarization direction laser light to the sixth polarization light-combining portion 243b; the sixth polarization light-combining portion 243b is used to transmit the first wavelength laser light of the first polarization direction emitted by the second light-emitting area in the second laser 120, and reflect the first wavelength laser light of the second polarization direction emitted by the eighth portion 241b, so as to polarize-combine the laser light emitted by the eighth portion 241b and the laser light emitted by the second light-emitting area in the second laser 120, and emit the laser light to the sixth wavelength light-combining portion 245b;

[0119] The fifth wavelength combining portion 245a is used to transmit the first wavelength laser emitted from the fifth polarization combining portion 243a, and reflect the second wavelength laser emitted from the third light exiting area of ​​the first laser 110, so as to wavelength combine the laser emitted from the fifth polarization combining portion 243a with the laser emitted from the third light exiting area of ​​the first laser 110, and emit it to the seventh wavelength combining portion 246a; the sixth wavelength combining portion 245b is used to transmit the first wavelength laser emitted from the sixth polarization combining portion 243b, and reflect the second wavelength laser emitted from the third light exiting area of ​​the third laser 130, so as to wavelength combine the laser emitted from the sixth polarization combining portion 243b with the laser emitted from the third light exiting area of ​​the third laser 130, and emit it to the eighth wavelength combining portion 246a. light portion 246b emits; the seventh wavelength combining portion 246a is used to transmit the first wavelength laser and the second wavelength laser emitted from the fifth wavelength combining portion 245a, and reflect the third wavelength laser emitted from the fourth light exiting area of ​​the first laser 110, so as to wavelength combine the laser emitted by the fifth wavelength combining portion 245a with the laser emitted from the fourth light exiting area of ​​the first laser 110; the eighth wavelength combining portion 246b is used to transmit the first wavelength laser and the second wavelength laser emitted from the sixth wavelength combining portion 245b, and reflect the third wavelength laser emitted from the fourth light exiting area of ​​the third laser 130, so as to wavelength combine the laser emitted by the sixth wavelength combining portion 245b with the laser emitted from the fourth light exiting area of ​​the third laser 130.

[0120] The sixth phase delay element 242 is located on the light-emitting side of the first light-emitting area in the third laser 130, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the first light-emitting area, and emit the second polarization direction laser light to the tenth wavelength combining unit 247b; the tenth wavelength combining unit 247b is used to transmit the third wavelength laser light of the second polarization direction emitted by the fourth light-emitting area in the second laser 120, and reflect the first wavelength laser light of the second polarization direction emitted by the sixth phase delay element 242, so as to wavelength combine the laser light emitted by the sixth phase delay element 242 with the laser light emitted by the fourth light-emitting area in the second laser 120, and emit the laser light to the fourth polarization combining unit 244; the fourth polarization combining unit 244 is used to combine the third wavelength laser light of the second polarization direction emitted by the fourth light-emitting area in the second laser 120. It is used to transmit the laser of the first polarization direction emitted from the second light emitting area in the third laser 130, and is used to reflect the laser of the second polarization direction emitted from the tenth wavelength combining part 247b, so as to polarize-combine the laser emitted from the tenth wavelength combining part 247b received with the laser emitted from the second light emitting area in the third laser 130, and emit it to the ninth wavelength combining part 247a; the ninth wavelength combining part 247a is used to transmit the second wavelength laser emitted from the third light emitting area in the second laser 120, and reflect the first wavelength laser and the third wavelength laser emitted from the fourth polarization combining part 244, so as to wavelength-combine the laser emitted from the third light emitting area in the second laser 120 with the laser emitted from the fourth polarization combining part 244.

[0121] Figure 28 for Figure 22 Schematic diagram of the combined light spot in the combined light path.

[0122] like Figure 28 As shown, the laser light source provided in this embodiment forms three rows of combined light spots L in the far field. Each row of combined light spots L after beam combination comprises two rows of red light spots R, one row of blue light spots B, and one row of green light spots G, presenting a symmetrical and even distribution. This embodiment uses fewer lenses to achieve a combined polarization and wavelength light combination, resulting in a more compact structure, a shorter optical path, and a smaller laser light source.

[0123] It should be noted that when the reflectivity and transmittance of the lens are high enough to meet the requirements or as close to the ideal value as possible, the energy incident on the laser is very small, so the problem of damaging the laser is not considered in this embodiment.

[0124] Figure 29 This is the sixth structural diagram of the laser light source provided in the embodiment of the present application.

[0125] In some embodiments, as Figure 29As shown, the three lasers are divided into a first laser 110, a second laser 120 and a third laser 130; the first laser 110 and the third laser 130 are arranged in parallel, and the light emitting directions are opposite; the second laser 120 is arranged perpendicular to the first laser 110, and the light emitting direction of the second laser 120 is perpendicular to the light emitting direction of the first laser 110;

[0126] The light combining assembly 200 includes a seventh phase delay element 251 , an eighth phase delay element 252 , a fifth polarization light combining element 253 , a sixth polarization light combining element 254 , a seventh wavelength light combining element 255 and an eighth wavelength light combining element 256 ;

[0127] Figure 30 for Figure 29 The structural diagram of the seventh phase delay element, Figure 31 for Figure 29 The structural diagram of the eighth phase delay element, Figure 32 for Figure 29 Schematic diagram of the structure of the fifth polarization light combiner, Figure 33 for Figure 29 Schematic diagram of the structure of the sixth polarization light combiner, Figure 34 for Figure 29 Schematic diagram of the structure of the seventh wavelength optical combiner. Figure 35 for Figure 29 Schematic diagram of the structure of the eighth wavelength optical combiner.

[0128] like Figure 30-Figure 35As shown, the seventh phase delay element 251 includes a ninth portion 251a and a tenth portion 251b, and the ninth portion 251a and the tenth portion 251b can be two independent structures or two parts of the same structure. Exemplarily, the seventh phase delay element 251 is a half-wave plate, and the ninth portion 251a and the tenth portion 251b are different regions of the half-wave plate. The eighth phase delay element 252 includes an eleventh portion 252a and a twelfth portion 252b, and the eleventh portion 252a and the twelfth portion 252b can be two independent structures or two parts of the same structure. Exemplarily, the eighth phase delay element 252 is a half-wave plate, and the eleventh portion 252a and the twelfth portion 252b are different regions of the half-wave plate. The fifth polarization light combiner 253 includes a seventh polarization light combiner 253a and an eighth polarization light combiner 253b, and the seventh polarization light combiner 253a and the eighth polarization light combiner 253b can be two independent structures or two parts of the same structure. Exemplarily, the fifth polarization light combiner 253 is a polarization light combiner, and the seventh polarization light combiner 253a and the eighth polarization light combiner 253b are different regions of the polarization light combiner. The sixth polarization light combiner 254 includes a ninth polarization light combiner 254a and a tenth polarization light combiner 254b. The ninth polarization light combiner 254a and the tenth polarization light combiner 254b can be two independent structures or two parts of the same structure. Exemplarily, the sixth polarization light combiner 254 is a polarization light combiner, and the ninth polarization light combiner 254a and the tenth polarization light combiner 254b are different regions of the polarization light combiner. The seventh wavelength light combiner 255 includes an eleventh wavelength light combiner 255a and a twelfth wavelength light combiner 255b. The eleventh wavelength light combiner 255a and the twelfth wavelength light combiner 255b can be two independent structures or two parts of the same structure. Exemplarily, the seventh wavelength combining element 255 is a dichroic film or a dichroic plate, and the eleventh wavelength combining portion 255a and the twelfth wavelength combining portion 255b are different regions of the dichroic film or the dichroic plate. The eighth wavelength combining element 256 includes a thirteenth wavelength combining portion 256a and a fourteenth wavelength combining portion 256b, and the thirteenth wavelength combining portion 256a and the fourteenth wavelength combining portion 256b can be two independent structures or two parts of the same structure. Exemplarily, the eighth wavelength combining element 256 is a dichroic film or a dichroic plate, and the thirteenth wavelength combining portion 256a and the fourteenth wavelength combining portion 256b are different regions of the dichroic film or the dichroic plate.

[0129] The ninth part 251a is located on the light output side of the first light output area in the first laser 110, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the first light output area, and emit a second polarization direction laser light to the seventh polarization combining part 253a; the seventh polarization combining part 253a is used to transmit the first wavelength laser light of the first polarization direction emitted by the first light output area in the second laser 120, and reflect the first wavelength laser light of the second polarization direction emitted by the ninth part 251a, so as to polarize-combine the laser light emitted by the ninth part 251a and the laser light emitted by the first light output area in the second laser 120, and emit them to the eleventh wavelength combining part 255a; the eleventh wavelength combining part 255a is used to transmit the first wavelength laser light emitted by the seventh polarization combining part 253a, and reflect the second wavelength laser light emitted by the third light output area in the first laser 110, so as to wavelength-combine the laser light emitted by the seventh polarization combining part 253a received with the laser light emitted by the third light output area in the first laser 110;

[0130] The tenth portion 251b is located on the light-emitting side of the second light-emitting area in the first laser 110, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the second light-emitting area, and emit the second polarization direction laser light to the eighth polarization combining portion 253b; the eighth polarization combining portion 253b is used to transmit the first wavelength laser light of the first polarization direction emitted by the second light-emitting area in the second laser 120, and reflect the first wavelength laser light of the second polarization direction emitted by the tenth portion 251b, so as to polarize-combine the laser light emitted by the tenth portion 251b received with the laser light emitted by the second light-emitting area in the second laser 120, and emit them to the twelfth wavelength combining portion 255b; the twelfth wavelength combining portion 255b is used to transmit the first wavelength laser light emitted by the eighth polarization combining portion 253b, and reflect the third wavelength laser light emitted by the fourth light-emitting area in the first laser 110, so as to wavelength-combine the laser light emitted by the eighth polarization combining portion 253b received with the laser light emitted by the fourth light-emitting area in the first laser 110;

[0131] The eleventh part 252a is located on the light-emitting side of the third light-emitting area in the second laser 120, and is used to generate a phase delay of π for the second polarization direction laser light emitted by the third light-emitting area, and emit the laser light of the first polarization direction to the ninth polarization combining part 254a; the ninth polarization combining part 254a is used to transmit the second wavelength laser light of the first polarization direction emitted by the eleventh part 252a, and reflect the second wavelength laser light of the second polarization direction emitted by the third light-emitting area in the third laser 130, so as to polarize-combine the laser light emitted by the eleventh part 252a received and the laser light emitted by the third light-emitting area in the third laser 130, and emit them to the thirteenth wavelength combining part 256a; the thirteenth wavelength combining part 256a is used to transmit the second wavelength laser light emitted by the ninth polarization combining part 254a, and reflect the first wavelength laser light emitted by the first light-emitting area in the third laser 130, so as to polarize-combine the laser light emitted by the ninth polarization combining part 254a received and the laser light emitted by the first light-emitting area in the third laser 130. The twelfth part 252b is located at the light-emitting side of the fourth light-emitting area in the second laser 120, and is used to generate a phase delay of π for the second polarization direction laser light emitted by the fourth light-emitting area, and emit the first polarization direction laser light to the tenth polarization light-combining part 254b; the tenth polarization light-combining part 254b is used to transmit the third wavelength laser light of the first polarization direction emitted by the twelfth part 252b, and reflect the third wavelength laser light emitted by the fourth light-emitting area in the third laser 130, so as to receive the twelfth The laser emitted by the tenth polarization combining unit 254b and the laser emitted by the fourth light emitting area in the third laser 130 are polarized and combined and emitted to the fourteenth wavelength combining unit 256b; the fourteenth wavelength combining unit 256b is used to transmit the third wavelength laser emitted by the tenth polarization combining unit 254b, and reflect the first wavelength laser emitted by the second light emitting area in the third laser 130, so as to wavelength combine the received laser emitted by the tenth polarization combining unit 254b with the laser emitted by the second light emitting area in the third laser 130.

[0132] Figure 36 for Figure 29 Schematic diagram of the combined light spot in the combined light path.

[0133] like Figure 36 As shown, the laser light source provided in this embodiment forms four rows of combined light spots L in the far field, wherein the first row of combined light spots L includes two rows of red light spots R and one row of blue light spots B, and the three rows of light spots are formed by overlapping. The second row of combined light spots L includes two rows of red light spots R and one row of green light spots G, and the three rows of light spots are formed by overlapping. The third row of combined light spots L includes one row of red light spots R and two rows of blue light spots B, and the three rows of light spots are formed by overlapping. The fourth row of combined light spots L includes one row of red light spots R and two rows of green light spots G, and the three rows of light spots are formed by overlapping. In this embodiment, fewer lenses are used to realize the light combining method that combines polarization combining and wavelength combining, which has a more compact structure, a shorter optical path, and a smaller laser light source.

[0134] It should be noted that when the reflectivity and transmittance of the lens are high enough to meet the requirements or as close to the ideal value as possible, the energy incident on the laser is very small, so the problem of damaging the laser is not considered in this embodiment.

[0135] Figure 37 This is the seventh structural schematic diagram of the laser light source provided in the embodiment of the present application.

[0136] In some embodiments, as Figure 37 As shown, the three lasers are divided into a first laser 110, a second laser 120 and a third laser 130; the first laser 110 and the third laser 130 are arranged in parallel, and the light emitting directions are opposite; the second laser 120 is arranged perpendicular to the first laser 110, and the light emitting direction of the second laser 120 is perpendicular to the light emitting direction of the first laser 110;

[0137] The light combining assembly 200 includes a ninth phase delay element 261 , a seventh polarization light combining element 262 , a ninth wavelength light combining element 263 , a tenth wavelength light combining element 264 , an eleventh wavelength light combining element 265 and a twelfth wavelength light combining element 266 ;

[0138] Figure 38 for Figure 37 The structural diagram of the ninth phase delay element, Figure 39 for Figure 37 Schematic diagram of the structure of the seventh polarization light combiner, Figure 40 for Figure 37 Schematic diagram of the structure of the ninth wavelength optical combiner. Figure 41 for Figure 37 Schematic diagram of the structure of the twelfth wavelength optical combiner.

[0139] like Figures 38-41As shown, the ninth phase delay element 261 includes a thirteenth portion 261a and a fourteenth portion 261b, the seventh polarization light combiner 262 includes an eleventh polarization light combiner 262a and a twelfth polarization light combiner 262b, the ninth wavelength light combiner 263 includes a fifteenth wavelength light combiner 263a and a sixteenth wavelength light combiner 263b, and the twelfth wavelength light combiner 266 includes a seventeenth wavelength light combiner 266a and an eighteenth wavelength light combiner 266b; illustratively, the ninth phase delay element 261 is a half-wave plate, the thirteenth portion 261a and the fourteenth portion 26 1b is a different area of ​​the half-wave plate; the seventh polarization light combiner 262 is a polarization light combiner, the eleventh polarization light combiner 262a and the twelfth polarization light combiner 262b are different areas of the polarization light combiner; the ninth wavelength light combiner 263 and the twelfth wavelength light combiner 266 are both dichroic films or dichroic plates, the fifteenth wavelength light combiner 263a and the sixteenth wavelength light combiner 263b are different areas of the dichroic films or dichroic plates, and the seventeenth wavelength light combiner 266a and the eighteenth wavelength light combiner 266b are different areas of the dichroic films or dichroic plates.

[0140] Combine Figure 37The thirteenth part 261a is located on the light-emitting side of the first light-emitting area in the first laser 110, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the first light-emitting area, and emit the second polarization direction laser light to the eleventh polarization combining part 262a; the eleventh polarization combining part 262a is used to transmit the first wavelength laser light of the first polarization direction emitted by the first light-emitting area in the second laser 120, and reflect the first wavelength laser light of the second polarization direction emitted by the thirteenth part 261a, so as to polarize-combine the laser light emitted by the received thirteenth part 261a and the laser light emitted by the first light-emitting area in the second laser 120 and emit them to the fifteenth wavelength combining part 263a; the fifteenth wavelength combining part 263a is used to transmit the first wavelength laser light emitted by the eleventh polarization combining part 262a, and reflect the second wavelength laser light emitted by the third light-emitting area in the first laser 110, so as to wavelength-combine the laser light emitted by the received eleventh polarization combining part 262a with the laser light emitted by the third light-emitting area in the first laser 110. The fourteenth part 261b is located at the light-emitting side of the second light-emitting area in the first laser 110, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the second light-emitting area, and emit the second polarization direction laser light to the twelfth polarization light-combining part 262b; the twelfth polarization light-combining part 262b is used to transmit the first wavelength laser light of the first polarization direction emitted by the second light-emitting area in the second laser 120, and reflect the first wavelength laser light of the second polarization direction emitted by the fourteenth part 261b, so as to receive the first polarization direction laser light. The laser light emitted by the fourteenth portion 261b is polarized and combined with the laser light emitted by the second light output area of ​​the second laser 120 and is emitted to the sixteenth wavelength combining portion 263b; the sixteenth wavelength combining portion 263b is used to transmit the first wavelength laser light emitted by the twelfth polarization combining portion 262b and reflect the third wavelength laser light emitted by the fourth light output area of ​​the first laser 110, so as to wavelength-combine the received laser light emitted by the twelfth polarization combining portion 262b with the laser light emitted by the fourth light output area of ​​the first laser 110;

[0141] The tenth wavelength combining element 264 is used to transmit the second wavelength laser emitted from the third light emitting area of ​​the second laser 120, and reflect the third wavelength laser emitted from the fourth light emitting area of ​​the third laser 130, so as to wavelength-combine the laser emitted from the third light emitting area of ​​the second laser 120 with the laser emitted from the fourth light emitting area of ​​the third laser 130, and emit them to the seventeenth wavelength combining portion 266a; the seventeenth wavelength combining portion 266a is used to transmit the second wavelength laser and the third wavelength laser emitted from the tenth wavelength combining element 264, and reflect the first wavelength laser emitted from the first light emitting area of ​​the third laser 130, so as to wavelength-combine the laser emitted from the tenth wavelength combining element 264 with the laser emitted from the first light emitting area of ​​the third laser 130;

[0142] The eleventh wavelength combining element 265 is used to transmit the third wavelength laser emitted from the fourth light output area of ​​the second laser 120, and reflect the second wavelength laser emitted from the third light output area of ​​the third laser 130, so as to wavelength combine the laser emitted from the fourth light output area of ​​the second laser 120 with the laser emitted from the third light output area of ​​the third laser 130, and emit them to the eighteenth wavelength combining portion 266b; the eighteenth wavelength combining portion 266b is used to transmit the second wavelength laser and the third wavelength laser emitted from the eleventh wavelength combining element 265, and reflect the first wavelength laser emitted from the second light output area of ​​the third laser 130, so as to wavelength combine the laser emitted from the eleventh wavelength combining element 265 with the laser emitted from the second light output area of ​​the third laser 130.

[0143] Figure 42 for Figure 37 Schematic diagram of the combined light spot in the combined light path.

[0144] like Figure 42 As shown, the laser light source provided in this embodiment forms four rows of combined light spots L in the far field, wherein the first row of combined light spots L includes two rows of red light spots R and one row of blue light spots B, and the three rows of light spots are formed by overlapping. The second row of combined light spots L includes two rows of red light spots R and one row of green light spots G, and the three rows of light spots are formed by overlapping. The third row of combined light spots L includes one row of red light spots R, one row of green light spots G and one row of blue light spots B, and the three rows of light spots are formed by overlapping. The fourth row of combined light spots L includes one row of red light spots R, one row of green light spots G and one row of blue light spots B, and the three rows of light spots are formed by overlapping. In this embodiment, fewer lenses are used to achieve a light combining method that combines polarization combining and wavelength combining, which has a more compact structure, a shorter optical path, a smaller laser light source, saves costs and improves efficiency.

[0145] Figure 43 A schematic diagram of the structure of the projection device provided in an embodiment of the present application.

[0146] Second, as Figure 43 As shown, the embodiment of the present application further provides a projection device, comprising an illumination assembly 300, a projection lens 400, and any laser light source as in the embodiment of the first aspect; the projection lens 400 is located on the light-emitting side of the illumination assembly 300; Figure 43 The light combining method of the laser light sources shown in the figure is for illustration only.

[0147] The lighting assembly 300 includes:

[0148] The diffuser 320 is located on the light-emitting side of the light-combining assembly 200;

[0149] The tenth phase delay element 310 is located between the light combining assembly 200 and the diffuser 320. The tenth phase delay element 310 is used to generate a phase delay of π on the received first laser beam and emit it toward the diffuser 320. The polarization direction of the laser beam received by the diffuser 320 and emitted through the tenth phase delay element 310 is perpendicular to the polarization direction of the second laser beam. The first laser beam is the laser beam emitted from the light combining assembly 200 and emitted toward the diffuser 320 through the tenth phase delay element 310. The second laser beam is the laser beam emitted directly from the light combining assembly 200 toward the diffuser 320.

[0150] The beam reduction lens group is located on the side of the diffuser 320 away from the light combining assembly 200, and the beam reduction lens group includes a focusing lens 341 and a collimating lens 342 arranged in sequence along the optical path;

[0151] The first compound eye 330 is located between the beam reducing lens group and the diffuser 320;

[0152] A diffusion wheel 360 is located at the focal plane of the beam reduction lens group;

[0153] The second compound eye 370 is located on the side of the beam reduction lens group away from the diffuser 320;

[0154] The light modulator 390 is located on a side of the second compound eye 370 away from the diffuser 320 .

[0155] Exemplarily, the tenth phase delay element 310 is a half-wave plate. The half-wave plate is placed in the optical path on the light-emitting side of the laser light source, ensuring that the laser light sources on both sides of the optical axis that pass through the half-wave plate and those that do not pass through the half-wave plate have orthogonal polarization states. The diffuser 320 and first compound eye 330 increase the laser angle, even the light, reduce speckle, and reduce stray light. The focusing lens 341 and the collimating lens 342 form a Keplerian telescope beam reduction system, reducing the spot area and filling the effective area of ​​the second compound eye 370 as much as possible. The diffusion wheel 360 is placed at the focal plane of the Keplerian telescope beam reduction system, which helps reduce its size. The rapid rotation of the diffusion wheel 360 simultaneously evens the light and suppresses speckle. The second compound eye 370 cooperates with the first lens 381, the deflecting mirror 382, ​​and the second lens 383 to further even the light and shape it to the size of the light modulator 390. The laser light emitted from the second lens 383 is reflected by the beam splitter prism 384 to the light modulator 390, which is a reflective light modulator. The light modulator 390 receives the light reflected by the beam splitter prism 384, modulates the incident light, and reflects the modulated light to the projection lens 400, which displays the projected image.

[0156] In some embodiments, the orthographic projection of the first compound eye in a direction perpendicular to the optical axis is a rectangle; the first compound eye includes a first substrate and a plurality of first microlenses, the plurality of first microlenses array is distributed on a first surface of the first substrate, and the orthographic projection of each first microlens in the plurality of first microlenses on the first surface is a rectangle or a hexagon;

[0157] The first compound eye and the laser light source output spot meet the following requirements:

[0158]

[0159] Where: L R L is the light source widening of the first wavelength laser spot emitted by the laser light source along the fast axis direction, G L is the light source widening of the third wavelength laser spot emitted by the laser light source along the fast axis direction, B is the light source broadening of the second wavelength laser spot emitted by the laser light source along the fast axis direction, α R is the divergence angle of the first wavelength laser spot emitted by the laser light source along the fast axis, α G is the divergence angle of the third wavelength laser spot emitted by the laser light source along the fast axis, α B is the divergence angle of the second wavelength laser spot emitted by the laser light source along the fast axis direction, a is the short side size of the first microlens, H a is the short side size of the first compound eye, n1 is the refractive index of the first compound eye, and R1 is the curvature radius of the first microlens.

[0160] In some embodiments, the orthographic projection of the second compound eye in a direction perpendicular to the optical axis is a rectangle; the second compound eye includes a second substrate and a plurality of second microlenses, the plurality of second microlenses array is distributed on the second surface of the second substrate, and the orthographic projection of each second microlens in the plurality of second microlenses on the second surface is a rectangle or a hexagon;

[0161] The relationship between the second compound eye and the optical modulator is as follows:

[0162]

[0163] Where: c is the short side size of the second microlens, n4 is the refractive index of the second compound eye, R4 is the curvature radius of the second microlens, n2 and n3 are the refractive indices of the focusing lens and the collimating lens respectively, R 21 、R 22 、R 31 、R 32 are the curvature radii of the focusing lens and the collimating lens on both sides of the optical axis; e and j are the effective dimensions of the short side and long side of the light modulator, respectively. e 、OLP j are the overlapping area sizes of the light modulator along the short side and long side respectively.

[0164] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations.

Claims

1. A laser light source, characterized in that: include: Three lasers, each of the lasers having a light-emitting surface comprising a first light-emitting area, a second light-emitting area, a third light-emitting area, and a fourth light-emitting area that are adjacent to each other in sequence, the first light-emitting area and the second light-emitting area being configured to emit linearly polarized laser light of a first wavelength in a first polarization direction, the third light-emitting area being configured to emit linearly polarized laser light of a second wavelength in a second polarization direction, and the fourth light-emitting area being configured to emit linearly polarized laser light of a third wavelength in the second polarization direction; the second polarization direction being perpendicular to the first polarization direction; The light combining component is located on the light output side of the three lasers and is used for polarization combining lasers of the same wavelength emitted from different light output areas of the three lasers, and is also used for wavelength combining lasers of different wavelengths.

2. The laser light source according to claim 1, wherein: The light combining assembly includes three light combining units, and each light emitting side of the laser is correspondingly provided with one light combining unit; The light combining unit includes a first phase delay element, a first reflector, a first polarization light combining element, a first wavelength light combining element and a second wavelength light combining element; the first reflector is used to receive the laser light of the first polarization direction emitted from the first light exit area and reflect it to the first polarization light combining element; the first phase delay element is used to generate a phase delay of π for the laser light of the first polarization direction received from the second light exit area, and emit the laser light of the second polarization direction to the first polarization light combining element; the first polarization light combining element is used to polarize-combine the laser light of the first polarization direction from the first reflector and the laser light of the second polarization direction from the first phase delay element and emit them to the first wavelength light combining element; the first wavelength light combining element is used to wavelength-combine the first wavelength laser light from the first polarization light combining element and the second wavelength laser light emitted from the third light exit area and emit them to the second wavelength light combining element; the second wavelength light combining element is used to wavelength-combine the laser light from the first wavelength light combining element and the third wavelength laser light emitted from the fourth light exit area.

3. The laser light source according to claim 2, wherein: The three lasers are divided into a first laser, a second laser and a third laser; the first laser and the second laser are arranged side by side along a first direction and have the same light emitting direction; along a second direction, the third laser is staggered with the first laser and the second laser, and the light emitting direction of the third laser is opposite to the light emitting direction of the first laser; wherein the first direction is the arrangement direction of the first light emitting area, the second light emitting area, the third light emitting area and the fourth light emitting area in the first laser, and the second direction is perpendicular to the first direction; Alternatively, the three lasers are divided into a first laser, a second laser and a third laser; the first laser and the second laser are arranged side by side and have the same light emitting direction, the third laser is arranged perpendicular to the first laser, and the light emitting direction of the third laser is perpendicular to the light emitting direction of the first laser; the light combining unit corresponding to the third laser also includes a second reflector, which is used to reflect the laser from the second wavelength light combining element and make the laser emit along a first direction, and the first direction is the arrangement direction of the first light emitting area, the second light emitting area, the third light emitting area and the fourth light emitting area in the first laser.

4. The laser light source according to claim 1, wherein: The three lasers are divided into a first laser, a second laser and a third laser; the first laser and the third laser are arranged side by side and have the same light emission direction; the second laser is arranged perpendicular to the first laser, and the light emission direction of the second laser is perpendicular to the light emission direction of the first laser; The light combining assembly includes a first light combining unit and a second light combining unit; the first light combining unit is located at the intersection of the laser light emitted by the first laser and the laser light emitted by the second laser; the second light combining unit is located at the intersection of the laser light emitted by the second laser and the laser light emitted by the third laser; The first light combining unit includes a second phase delay element, a third phase delay element and a third wavelength light combining element; The second phase delay element includes a first portion and a second portion, the third phase delay element includes a third portion and a fourth portion, and the third wavelength combining element includes a first wavelength combining portion, a second wavelength combining portion, a third wavelength combining portion, and a fourth wavelength combining portion; The fourth part is located on the light-emitting side of the fourth light-emitting area in the second laser, and is used to generate a phase delay of π for the second polarization direction laser light emitted by the fourth light-emitting area, and emit a laser light of the first polarization direction to the first wavelength combining part; the first wavelength combining part is used to wavelength combine the laser light emitted by the first light-emitting area in the first laser and the laser light emitted by the fourth part; the third part is located on the light-emitting side of the third light-emitting area in the second laser, and is used to generate a phase delay of π for the second polarization direction laser light emitted by the third light-emitting area, and emit a laser light of the first polarization direction to the second wavelength combining part; the second wavelength combining part is used to wavelength combine the laser light emitted by the second light-emitting area in the first laser and the laser light emitted by the third part; The first part is located on the light-emitting side of the third light-emitting area in the first laser, and is used to generate a phase delay of π for the second polarization direction laser light emitted by the third light-emitting area, and emit the laser light of the first polarization direction to the third wavelength combining part; the third wavelength combining part is used to wavelength combine the laser light emitted by the second light-emitting area in the second laser and the laser light emitted by the first part; the second part is located on the light-emitting side of the fourth light-emitting area in the first laser, and is used to generate a phase delay of π for the second polarization direction laser light emitted by the fourth light-emitting area, and emit the laser light of the first polarization direction to the fourth wavelength combining part; the fourth wavelength combining part is used to wavelength combine the laser light emitted by the first light-emitting area in the second laser and the laser light emitted by the second part; The second light combining unit includes a fourth phase delay element and a second polarization light combining element; The fourth phase delay element includes a fifth portion and a sixth portion, and the second polarization light combiner includes a first polarization light combiner, a second polarization light combiner, a third polarization light combiner, and a fourth polarization light combiner; The fifth part is located on the light output side of the first light output area in the third laser, and is used to generate a phase delay of π for the first polarization direction laser emitted by the first light output area, and emit a second polarization direction laser to the first polarization combining part; the first polarization combining part is used to polarization combine the laser emitted by the fifth part and the laser emitted by the first wavelength combining part; the sixth part is located on the light output side of the second light output area in the third laser, and is used to generate a phase delay of π for the first polarization direction laser emitted by the second light output area, and emit a second polarization direction laser to the second polarization combining part; the second polarization combining part is used to polarization combine the laser emitted by the sixth part and the laser emitted by the second wavelength combining part; the third polarization combining part is used to polarization combine the laser emitted by the third light output area in the third laser and the laser emitted by the third wavelength combining part; the fourth polarization combining part is used to polarization combine the laser emitted by the fourth light output area in the third laser and the laser emitted by the fourth wavelength combining part.

5. The laser light source according to claim 1, wherein: The three lasers are divided into a first laser, a second laser and a third laser; the first laser and the third laser are arranged in parallel, and the light emitting directions are opposite; the second laser is arranged perpendicular to the first laser, and the light emitting direction of the second laser is perpendicular to the light emitting direction of the first laser; The light combining assembly includes a fifth phase delay element, a sixth phase delay element, a third polarization light combining element, a fourth polarization light combining element, a fourth wavelength light combining element, a fifth wavelength light combining element and a sixth wavelength light combining element; The fifth phase delay element includes a seventh portion and an eighth portion, the third polarization light combiner includes a fifth polarization light combiner and a sixth polarization light combiner, the fourth wavelength light combiner includes a fifth wavelength light combiner and a sixth wavelength light combiner, the fifth wavelength light combiner includes a seventh wavelength light combiner and an eighth wavelength light combiner, and the sixth wavelength light combiner includes a ninth wavelength light combiner and a tenth wavelength light combiner; The seventh part is located at the light-emitting side of the first light-emitting area of ​​the first laser, and is used to generate a phase delay of π for the laser light of the first polarization direction emitted by the first light-emitting area, and emit the laser light of the second polarization direction to the fifth polarization light combining part; The fifth polarization combining unit is used to perform polarization combining on the laser light emitted by the seventh unit and the laser light emitted by the first light emitting area of ​​the second laser, and emit the polarization combined light to the fifth wavelength combining unit; The eighth part is located on the light-emitting side of the second light-emitting area of ​​the first laser, and is used to generate a phase delay of π for the laser light of the first polarization direction emitted by the second light-emitting area, and emit the laser light of the second polarization direction to the sixth polarization combining part; the sixth polarization combining part is used to polarization-combine the laser light emitted by the eighth part and the laser light emitted by the second light-emitting area of ​​the second laser, and emit the laser light to the sixth wavelength combining part; The fifth wavelength combining unit is used to combine the wavelengths of the laser light emitted by the fifth polarization combining unit with the laser light emitted by the third light emitting area of ​​the first laser, and emit it to the seventh wavelength combining unit; the sixth wavelength combining unit is used to combine the wavelengths of the laser light emitted by the sixth polarization combining unit with the laser light emitted by the third light emitting area of ​​the third laser, and emit it to the eighth wavelength combining unit; the seventh wavelength combining unit is used to combine the wavelengths of the laser light emitted by the fifth wavelength combining unit with the laser light emitted by the fourth light emitting area of ​​the first laser, and the eighth wavelength combining unit is used to combine the wavelengths of the laser light emitted by the sixth wavelength combining unit with the laser light emitted by the fourth light emitting area of ​​the third laser; The sixth phase delay element is located on the light output side of the first light output area in the third laser, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the first light output area, and emit a second polarization direction laser light to the tenth wavelength combining unit; the tenth wavelength combining unit is used to wavelength combine the laser light emitted by the sixth phase delay element with the laser light emitted by the fourth light output area in the second laser, and emit it to the fourth polarization combining unit; the fourth polarization combining unit is used to polarize combine the laser light emitted by the tenth wavelength combining unit with the laser light emitted by the second light output area in the third laser, and emit it to the ninth wavelength combining unit; the ninth wavelength combining unit is used to wavelength combine the laser light emitted by the third light output area in the second laser with the laser light emitted by the fourth polarization combining unit.

6. The laser light source according to claim 1, wherein: The three lasers are divided into a first laser, a second laser and a third laser; the first laser and the third laser are arranged in parallel, and the light emitting directions are opposite; the second laser is arranged perpendicular to the first laser, and the light emitting direction of the second laser is perpendicular to the light emitting direction of the first laser; The light combining assembly includes a seventh phase delay element, an eighth phase delay element, a fifth polarization light combining element, a sixth polarization light combining element, a seventh wavelength light combining element and an eighth wavelength light combining element; The seventh phase delay element includes a ninth portion and a tenth portion, the eighth phase delay element includes an eleventh portion and a twelfth portion, the fifth polarization light combiner includes a seventh polarization light combiner and an eighth polarization light combiner, the sixth polarization light combiner includes a ninth polarization light combiner and a tenth polarization light combiner, the seventh wavelength light combiner includes an eleventh wavelength light combiner and a twelfth wavelength light combiner, and the eighth wavelength light combiner includes a thirteenth wavelength light combiner and a fourteenth wavelength light combiner; The ninth part is located on the light-emitting side of the first light-emitting area in the first laser, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the first light-emitting area, and emit a second polarization direction laser light to the seventh polarization combining part; the seventh polarization combining part is used to perform polarization combining on the laser light emitted by the ninth part and the laser light emitted by the first light-emitting area in the second laser, and emit the polarizations to the eleventh wavelength combining part; the eleventh wavelength combining part is used to perform wavelength combining on the laser light emitted by the seventh polarization combining part and the laser light emitted by the third light-emitting area in the first laser; The tenth part is located on the light-emitting side of the second light-emitting area of ​​the first laser, and is used to generate a phase delay of π for the laser light of the first polarization direction emitted by the second light-emitting area, and emit the laser light of the second polarization direction to the eighth polarization combining part; the eighth polarization combining part is used to polarization-combine the laser light emitted by the tenth part and the laser light emitted by the second light-emitting area of ​​the second laser, and emit the laser light to the twelfth wavelength combining part; The twelfth wavelength combining unit is used to wavelength combine the laser light emitted by the eighth polarization combining unit and the laser light emitted by the fourth light emitting area of ​​the first laser; The eleventh part is located on the light-emitting side of the third light-emitting area in the second laser, and is used to generate a phase delay of π for the second polarization direction laser light emitted by the third light-emitting area, and emit a laser light of the first polarization direction to the ninth polarization combining part; the ninth polarization combining part is used to polarization-combine the laser light emitted by the eleventh part and the laser light emitted by the third light-emitting area in the third laser, and emit the laser light to the thirteenth wavelength combining part; the thirteenth wavelength combining part is used to wavelength-combine the laser light emitted by the ninth polarization combining part and the laser light emitted by the first light-emitting area in the third laser; the twelfth part is located on the light-emitting side of the fourth light-emitting area in the second laser, and is used to generate a phase delay of π for the second polarization direction laser light emitted by the fourth light-emitting area, and emit the laser light of the first polarization direction to the tenth polarization combining part; the tenth polarization combining part is used to polarization-combine the laser light emitted by the twelfth part and the laser light emitted by the fourth light-emitting area in the third laser, and emit the laser light to the fourteenth wavelength combining part; The fourteenth wavelength combining unit is used to wavelength combine the laser light emitted by the tenth polarization combining unit and the laser light emitted by the second light emitting area of ​​the third laser.

7. The laser light source according to claim 1, wherein: The three lasers are divided into a first laser, a second laser and a third laser; the first laser and the third laser are arranged in parallel, and the light emitting directions are opposite; the second laser is arranged perpendicular to the first laser, and the light emitting direction of the second laser is perpendicular to the light emitting direction of the first laser; The light combining assembly includes a ninth phase delay element, a seventh polarization light combining element, a ninth wavelength light combining element, a tenth wavelength light combining element, an eleventh wavelength light combining element, and a twelfth wavelength light combining element; The ninth phase delay element includes a thirteenth portion and a fourteenth portion, the seventh polarization light combiner includes an eleventh polarization light combiner and a twelfth polarization light combiner, the ninth wavelength light combiner includes a fifteenth wavelength light combiner and a sixteenth wavelength light combiner, and the twelfth wavelength light combiner includes a seventeenth wavelength light combiner and an eighteenth wavelength light combiner; The thirteenth part is located on the light-emitting side of the first light-emitting area in the first laser, and is used to generate a phase delay of π for the laser light of the first polarization direction emitted by the first light-emitting area, and emit the laser light of the second polarization direction to the eleventh polarization combining part; the eleventh polarization combining part is used to polarization-combine the laser light emitted by the thirteenth part and the laser light emitted by the first light-emitting area in the second laser, and emit them to the fifteenth wavelength combining part; the fifteenth wavelength combining part is used to wavelength-combine the laser light emitted by the eleventh polarization combining part and the laser light emitted by the third light-emitting area in the first laser; The fourteenth part is located on the light-emitting side of the second light-emitting area in the first laser, and is used to generate a phase delay of π for the first polarization direction laser light emitted by the second light-emitting area, and emit the second polarization direction laser light to the twelfth polarization combining part; the twelfth polarization combining part is used to polarization-combine the laser light emitted by the fourteenth part and the laser light emitted by the second light-emitting area in the second laser, and emit them to the sixteenth wavelength combining part; the sixteenth wavelength combining part is used to wavelength-combine the laser light emitted by the twelfth polarization combining part and the laser light emitted by the fourth light-emitting area in the first laser; The tenth wavelength combining element is used to combine the laser light emitted from the third light emitting area of ​​the second laser with the laser light emitted from the fourth light emitting area of ​​the third laser, and emit the combined light to the seventeenth wavelength combining unit; The seventeenth wavelength combining unit is used to combine the laser light emitted by the tenth wavelength combining element with the laser light emitted by the first light emitting area of ​​the third laser; The eleventh wavelength combining component is used to wavelength combine the laser emitted from the fourth light output area of ​​the second laser and the laser emitted from the third light output area of ​​the third laser, and emit them to the eighteenth wavelength combining unit; the eighteenth wavelength combining unit is used to wavelength combine the laser emitted from the eleventh wavelength combining component and the laser emitted from the second light output area of ​​the third laser.

8. A projection device, characterized in that: It comprises an illumination assembly, a projection lens, and a laser light source according to any one of claims 1 to 7; the projection lens is located on the light-emitting side of the illumination assembly; The lighting assembly comprises: a diffuser, located on the light-emitting side of the light-combining assembly; a tenth phase delay element, located between the light-combining assembly and the diffuser; the tenth phase delay element is used to generate a phase delay of π on the received first laser beam and emit it toward the diffuser, the polarization direction of the laser beam received by the diffuser and emitted through the tenth phase delay element being perpendicular to the polarization direction of the second laser beam; the first laser beam is the laser beam emitted from the light-combining assembly to the diffuser through the tenth phase delay element, and the second laser beam is the laser beam emitted directly from the light-combining assembly to the diffuser; a beam reduction lens group, located on the side of the diffuser away from the light combining assembly, the beam reduction lens group comprising a focusing lens and a collimating lens sequentially arranged along the optical path; a first compound eye, located between the beam reduction lens group and the diffuser; a diffusion wheel, located at the focal plane of the beam reduction lens group; a second compound eye, located on a side of the beam reduction lens group away from the diffuser; The light modulator is located on a side of the second compound eye away from the diffuser.

9. The projection device according to claim 8, characterized in that The orthographic projection of the first compound eye in a direction perpendicular to the optical axis is a rectangle; the first compound eye includes a first substrate and a plurality of first microlenses, the plurality of first microlenses are arrayed on a first surface of the first substrate, and the orthographic projection of each first microlens in the plurality of first microlenses on the first surface is a rectangle or a hexagon; The first compound eye and the laser light source output spot satisfy the following conditions: Where: L R L is the light source widening of the first wavelength laser spot emitted by the laser light source along the fast axis direction, G L is the light source widening of the third wavelength laser spot emitted by the laser light source along the fast axis direction, B is the light source broadening of the second wavelength laser spot emitted by the laser light source along the fast axis direction, α R is the divergence angle of the first wavelength laser spot emitted by the laser light source along the fast axis direction, α G is the divergence angle of the third wavelength laser spot emitted by the laser light source along the fast axis direction, α B is the divergence angle of the second wavelength laser spot emitted by the laser light source along the fast axis direction, a is the short side size of the first microlens, H a is the short side size of the first compound eye, n1 is the refractive index of the first compound eye, and R1 is the curvature radius of the first microlens.

10. The projection device according to claim 9, characterized in that The orthographic projection of the second compound eye in a direction perpendicular to the optical axis is a rectangle; the second compound eye includes a second substrate and a plurality of second microlenses, the plurality of second microlenses are arrayed on the second surface of the second substrate, and the orthographic projection of each second microlens in the plurality of second microlenses on the second surface is a rectangle or a hexagon; The second compound eye and the light modulator satisfy the following conditions: Wherein: c is the short side size of the second microlens, n4 is the refractive index of the second compound eye, R4 is the curvature radius of the second microlens, n2 and n3 are the refractive indices of the focusing lens and the collimating lens respectively, R 21 、R 22 、R 31 、R 32 are the curvature radii of the two side surfaces of the focusing lens and the collimating lens along the optical axis direction; e and j are the effective dimensions of the short side and long side of the light modulator, respectively. e 、OLP j are respectively the overlapping area sizes of the light modulator along the short side and the long side.

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