Laser light source and projection device

Abstract

The application discloses a laser light source and a projection device, and belongs to the field of laser projection. The laser light source comprises a first laser, a second laser, a first light combiner, a second light combiner and a third light combiner. The first laser is used for emitting first laser light towards the first light combiner, and the first light combiner is used for guiding the first laser light to the third light combiner. The second laser is used for emitting second laser light towards the second light combiner, and the second light combiner is used for guiding the second laser light to the third light combiner. The number of rows of light emitting units in the first laser is greater than the number of rows of light emitting units in the second laser. The first laser light guided by the first light combiner and the second laser light guided by the second light combiner are combined by the third light combiner, the combination of different types of the first laser and the second laser can be realized, and the laser light source has higher flexibility.

Description

Technical Field

[0001] This application relates to the field of laser projection, and in particular to a laser light source and a projection device. Background Technology

[0002] In current laser projection optical systems, multiple lasers are typically used simultaneously to achieve higher projection brightness. In this case, to facilitate the homogenization and shaping of the light spot, ensure the matching of the optical extension of two or more lasers, and guarantee the uniformity and consistency of the illumination beam of the DMD (Digital Micromirror Device), the industry generally chooses to use two or more lasers with the same structure to construct the light source module.

[0003] However, using multiple identical lasers in a light source module reduces the flexibility of the laser light source. Summary of the Invention

[0004] This application provides a laser light source and a projection device. It solves the problem in the prior art that different lasers cannot be used together. The technical solution is as follows:

[0005] In a first aspect, a laser source is provided, comprising: a first laser, a second laser, a first beam combiner group, a second beam combiner group, and a third beam combiner group;

[0006] The first beam combining mirror group is located on the light-emitting side of the first laser. The first laser is used to emit a first laser beam toward the first beam combining mirror group. The first beam combining mirror group is used to guide the first laser beam to the third beam combining mirror group.

[0007] The second beam combiner group is located on the light-emitting side of the second laser. The second laser is used to emit a second laser beam toward the second beam combiner group, and the second beam combiner group is used to guide the second laser beam toward the third beam combiner group.

[0008] The third beam combining mirror group is used to combine the first laser beam exported from the first beam combining mirror group and the second laser beam exported from the second beam combining mirror group.

[0009] Both the first laser and the second laser have multiple rows of light-emitting units, and the number of rows of light-emitting units in the first laser is greater than the number of rows of light-emitting units in the second laser.

[0010] Optionally, the first laser includes: at least one row of first-type light-emitting units and at least two rows of second-type light-emitting units; the first laser includes: a first-type laser emitted by the first-type light-emitting units and a second-type laser emitted by the second-type light-emitting units;

[0011] The second laser includes: at least one row of third-type light-emitting units and at least one row of fourth-type light-emitting units; the second laser includes: third-type laser emitted by the third-type light-emitting units and fourth-type laser emitted by the fourth-type light-emitting units;

[0012] The wavelength range of the first type of laser overlaps with that of the third type of laser, and the polarization directions of the first type of laser and the third type of laser directed toward the third beam combiner are different.

[0013] The wavelength range of the second type of laser overlaps with that of the fourth type of laser, and the polarization directions of the second type of laser and the fourth type of laser directed toward the third beam combiner are different.

[0014] The third beam combiner is used to reflect one of the first laser and the second laser, and to transmit the other of the first laser and the second laser.

[0015] Optionally, the third beam combining lens group includes: a first polarization selection lens;

[0016] The first beam combining mirror group is used to combine the first type of laser and the second type of laser, and guides the combined first type of laser and the second type of laser to the first polarization selection lens. The polarization direction of the first type of laser and the second type of laser directed toward the first polarization selection lens is the first polarization direction.

[0017] The second beam combining mirror group is used to combine the third type laser and the fourth type laser, and guides the combined third type laser and the fourth type laser to the first polarization selection lens. The polarization direction of the third type laser and the fourth type laser that are directed toward the first polarization selection lens is the second polarization direction.

[0018] The first polarization-selective lens is used to reflect one of the laser beams in the first polarization direction and the laser beams in the second polarization direction, and to transmit the other of the laser beams in the first polarization direction and the laser beams in the second polarization direction.

[0019] Optionally, the first beam combining lens group includes: a first beam combining lens located on the light-emitting side of the at least one row of first-type light-emitting units, and at least two second beam combining lenses; the at least two second beam combining lenses are respectively distributed on the light-emitting side of the at least two rows of second-type light-emitting units; the first beam combining lens, the at least two second beam combining lenses, and the first polarization selection lens are arranged in a first direction;

[0020] The second beam combining lens group includes: a third beam combining lens located on the light-emitting side of the at least one row of third type light-emitting units, and a fourth beam combining lens located on the light-emitting side of the at least one row of fourth type light-emitting units; the third beam combining lens, the fourth beam combining lens, and the first polarization selection lens are arranged in a second direction;

[0021] Wherein, the first direction intersects with the second direction.

[0022] Optionally, the third beam combining lens group includes: a second polarization selection lens and a third polarization selection lens;

[0023] The first beam combining mirror group is used to guide the first type of laser to the second polarization selection mirror, combine the second type of laser emitted from the at least two rows of second type of light-emitting units, and guide the combined second type of laser to the third polarization selection mirror; the polarization direction of the first type of laser directed toward the second polarization selection mirror and the second type of laser directed toward the third polarization selection mirror are both the first polarization direction;

[0024] The second beam combining mirror group is used to combine the third type laser and the fourth type laser, and guides the combined third type laser and the fourth type laser to the second polarization selection lens. The polarization direction of the third type laser and the fourth type laser that are directed toward the second polarization selection lens is the second polarization direction.

[0025] The second polarization selection lens is used to reflect laser light in the first polarization direction and transmit laser light in the second polarization direction;

[0026] The third polarization selective lens is located on the light-emitting side of the second polarization selective lens. The colors of the second type of laser and the fourth type of laser are both set colors. The third polarization selective lens is used to reflect lasers with polarization direction of the first polarization direction and color of the set color, and to transmit lasers with polarization direction of the second polarization direction, as well as lasers with polarization direction of the first polarization direction and color that is not the set color.

[0027] Optionally, the first beam combining lens group includes: a first beam combining lens located on the light-emitting side of the at least one row of first-type light-emitting units, and at least two second beam combining lenses; the at least two second beam combining lenses are respectively distributed on the light-emitting side of the at least two rows of second-type light-emitting units; the first beam combining lens and the second polarization selection lens are arranged in a first direction; the at least two second beam combining lenses and the third polarization selection lens are arranged in the first direction;

[0028] The second beam combining lens group includes: a third beam combining lens located on the light-emitting side of the at least one row of third type light-emitting units, and a fourth beam combining lens located on the light-emitting side of the at least one row of fourth type light-emitting units; the third beam combining lens, the fourth beam combining lens, the second polarization selective lens, and the third polarization selective lens are arranged in a second direction;

[0029] Wherein, the first direction intersects with the second direction.

[0030] Optionally, the laser source further includes: a first half-wave plate and a second half-wave plate; the first half-wave plate is located on the light-emitting side of the first type of light-emitting unit, and the second half-wave plate is located on the light-emitting side of the fourth type of light-emitting unit.

[0031] Optionally, the laser source further includes a diffuser; the diffuser is located on the light-emitting side of the third beam combiner group.

[0032] Optionally, the laser source further includes: a first lens, a second lens, and a third lens; the first lens is located on the light-emitting side of the first beam combining mirror group, the second lens is located on the light-emitting side of the second beam combining mirror group, and the third lens is located on the light-emitting side of the diffuser.

[0033] The diffuser has a converging region, the first lens is used to focus the first laser emitted from the first beam combiner group to the converging region, the second lens is used to focus the second laser emitted from the second beam combiner group to the converging region, and the third lens is used to collimate the first laser and the second laser emitted from the diffuser.

[0034] In a second aspect, a laser projection device is provided, comprising: any of the laser light source, light modulation device, and projection lens described above.

[0035] The beneficial effects of the technical solutions provided in this application include at least the following:

[0036] The first laser emitted from the first laser source is guided by a first beam combiner group to a third beam combiner group. The second laser emitted from the second laser source is guided by a second beam combiner group to the third beam combiner group. The third beam combiner group combines the first laser emitted from the first beam combiner group and the second laser emitted from the second beam combiner group. After the first and second lasers are combined by the third beam combiner group, different types of first and second lasers can be used together, enabling greater flexibility of the laser source and achieving a balance in terms of heat dissipation, light output intensity, beam quality, and cost for the entire optical system. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of a laser source structure provided in an embodiment of this application;

[0039] Figure 2 This is a schematic diagram of another laser source structure provided in an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of a first laser structure provided in an embodiment of this application;

[0041] Figure 4 A schematic diagram of a second laser structure provided in an embodiment of this application;

[0042] Figure 5 This is a schematic diagram of another laser source structure provided in the embodiments of this application;

[0043] Figure 6 This is a schematic diagram of a laser source structure provided in another embodiment of this application;

[0044] Figure 7 This is a schematic diagram of another laser source structure provided in another embodiment of this application;

[0045] Figure 8 A schematic diagram illustrating the selection principle of a first lens and a second lens provided in an embodiment of this application;

[0046] Figure 9 A schematic diagram showing the spot size of the first laser emitted by the first laser in the x and y directions is displayed.

[0047] Figure 10 A schematic diagram showing the spot size of the second laser emitted by the second laser in the x and y directions is presented.

[0048] Figure 11 A schematic diagram illustrating the selection principle of a second lens, a second sub-lens, and an auxiliary lens provided in an embodiment of this application;

[0049] Figure 12 This is a schematic diagram of the principle of a turning prism provided in an embodiment of this application. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0051] Currently, tri-color packaged semiconductor lasers, with their compact structure, are widely used as light sources in laser projection equipment. Due to current laser manufacturing limitations, different types or models of tri-color semiconductor lasers exhibit significant differences in beam divergence angle and spot size. These differences in beam shape lead to variations in the subsequent optical path configurations, requiring separate design for each. To address this limitation and achieve higher projected light brightness, when multiple lasers are used in combination, the industry typically selects lasers of the same model and arranges them symmetrically to combine the light sources, thus avoiding light efficiency losses caused by variations in optical spread.

[0052] However, while combining multiple lasers of the same shape is less difficult in terms of optical architecture design, the reduced selection space decreases the flexibility of the light source module in terms of cost and heat dissipation.

[0053] This application proposes a laser source that allows for the shaping of the beam divergence angle and beam size of two three-color packaged semiconductor lasers with different beam shapes, and completes homogenization and beam combining. The resulting beam can be input into the illumination module of a laser projection optical system to illuminate a spatial light modulation device.

[0054] The specific design of the laser source 000 proposed in this application is described below:

[0055] Figure 1 This is a schematic diagram of a laser source structure provided in an embodiment of this application. Please refer to... Figure 1 In one embodiment of this application, a laser source 000 is provided, including: a first laser 010, a second laser 020, a first beam combining mirror group 030, a second beam combining mirror group 040, and a third beam combining mirror group 050.

[0056] The first beam combining mirror group 030 is located on the light-emitting side of the first laser 010. The first laser 010 is used to emit the first laser S1 toward the first beam combining mirror group 030. The first beam combining mirror group 030 is used to guide the first laser S1 to the third beam combining mirror group 050.

[0057] The second beam combiner group 040 is located on the light-emitting side of the second laser 020. The second laser 020 is used to emit the second laser S2 toward the second beam combiner group 040. The second beam combiner group 040 is used to guide the second laser S2 to the third beam combiner group 050.

[0058] The third beam combiner group 050 is used to combine the first laser S1 exported from the first beam combiner group 030 and the second laser S2 exported from the second beam combiner group 040.

[0059] The first laser 010 and the second laser 020 both have multiple rows of light-emitting units G, and the number of rows of light-emitting units G in the first laser 010 is greater than the number of rows of light-emitting units G in the second laser 020.

[0060] In summary, the first laser emitted from the first laser is guided by the first beam combiner group to the third beam combiner group, and the second laser emitted from the second laser is guided by the second beam combiner group to the third beam combiner group. The third beam combiner group combines the first laser emitted from the first beam combiner group and the second laser emitted from the second beam combiner group. After the first and second lasers are combined by the third beam combiner group, different types of first and second lasers can be used together, which can make the laser source more flexible and allow the entire optical system to achieve a balance in terms of heat dissipation, light output intensity, beam quality, and cost.

[0061] Figure 2 This is a schematic diagram of another laser source 000 structure provided in an embodiment of this application. Please refer to... Figure 2 In one feasible implementation, the first laser 010 includes at least one row of first-type light-emitting units G1 and at least two rows of second-type light-emitting units G2. The first laser S1 includes a first-type laser S11 emitted by the first-type light-emitting units G1 and a second-type laser S12 emitted by the second-type light-emitting units G2.

[0062] The second laser 020 includes at least one row of third-type light-emitting units G3 and at least one row of fourth-type light-emitting units G4. The second laser S2 includes a third-type laser S21 emitted by the third-type light-emitting units G3 and a fourth-type laser S22 emitted by the fourth-type light-emitting units G4.

[0063] The wavelength range of the first type laser S11 overlaps with that of the third type laser S21, and the polarization directions of the first type laser S11 and the third type laser S21 directed toward the third beam combiner 050 are different.

[0064] The wavelength range of the second type laser S12 overlaps with that of the fourth type laser S22, and the polarization directions of the second type laser S12 and the fourth type laser S22 directed toward the third beam combiner group 050 are different.

[0065] The third beam combining mirror group 050 is used to reflect one of the first laser S1 and the second laser S2, and to transmit the other of the first laser S1 and the second laser S2.

[0066] For example, Figure 2As shown, the third beam combiner group 050 is used to reflect the first laser S1 and transmit the second laser S2. Since the number of rows of light-emitting units G in the first laser 010 is greater than the number of rows of light-emitting units G in the second laser 020, the spot size of the first laser S1 emitted by the first laser 010 can be larger, and the spot size of the second laser S2 emitted by the second laser 020 can be smaller. When the third beam combiner group 050 can reflect the relatively larger spot size of the first laser S1 and transmit the relatively smaller spot size of the second laser S2, it facilitates a more compact structure for the laser source 000, enabling miniaturization of the laser source 000.

[0067] In one feasible implementation, both the first laser 010 and the second laser 020 are tri-color packaged semiconductor lasers.

[0068] Figure 3 This is a schematic diagram of a first laser 010 provided in an embodiment of this application. Please refer to... Figure 3 For example, the first laser 010 includes two rows of first-type light-emitting units G1 and two rows of second-type light-emitting units G2.

[0069] Among them, the first type of light-emitting unit G1 is used to emit red laser R, one row of the two rows of second type light-emitting units G2 is used to emit green laser G, and the other row of second type light-emitting units G2 is used to emit blue laser B.

[0070] Figure 4 This is a schematic diagram of a second laser 020 provided in an embodiment of this application. Please refer to... Figure 4 For example, the second laser 020 includes: a row of third type light-emitting units G3 and a row of fourth type light-emitting units G4.

[0071] Among them, the third type of light-emitting unit G3 is used to emit red laser R, and the fourth type of light-emitting unit G4 is used to emit green laser G and blue laser B.

[0072] The first laser 010, with more rows of light-emitting units G, can emit a brighter laser beam with a larger spot size. The second laser 020, with fewer rows of light-emitting units G, can emit a relatively dimmer laser beam with a relatively smaller spot size. Therefore, using the first laser 010 and the second laser 020 in combination can obtain a laser beam with moderate brightness and balance costs.

[0073] Specifically, in one feasible implementation, the first laser 010 is a three-color semiconductor laser, and the top view of the emitted laser spot is as follows. Figure 3As shown, it contains four rows of light-emitting units G. The typical size of a single row of light spots in the first laser 010 is approximately 16*6mm, and the typical red light divergence angle is 2.5°. For conventional projection optics systems, this spot size is too large and difficult to coordinate with the illumination system. When using this type of laser in a projection optics system, a telescope system must first be set up to reduce the spot size.

[0074] The second laser, 020, is a small-packaged tri-color semiconductor laser. A top view of the emitted laser spot is shown below. Figure 4 As shown, this laser contains only two rows of a small number of light-emitting units G, with the blue and green light-emitting units G asymmetrically packaged in the same row. The typical single-row spot size in the second laser 020 is approximately 6*3mm, and the typical red light divergence angle is 5°. Taking red light as an example, calculations show that the red light optical extension of this type of semiconductor laser is 37.4% of the red light optical extension of the aforementioned three-color semiconductor laser, indicating a significant difference in optical extension.

[0075] The first laser 010 and the second laser 020 employ different packaging methods and have different spot sizes and divergence angles. The laser source 000 in this application can match and shape the optical extension of different lasers, thereby forming a high-quality beam that enters the compound eye lens for homogenization, giving the laser source 000 greater flexibility in laser selection.

[0076] Figure 5 This is a schematic diagram of another laser source 000 structure provided in an embodiment of this application. Please refer to... Figure 5 In one feasible implementation, the third beam combining lens group 050 includes: a first polarization selection lens 051.

[0077] The first beam combining mirror group 030 is used to combine the first type of laser S11 and the second type of laser S12, and guides the combined first type of laser S11 and the second type of laser S12 to the first polarization selection lens 051. The polarization direction of the first type of laser S11 and the second type of laser S12 directed toward the first polarization selection lens 051 is the first polarization direction.

[0078] The second beam combining mirror group 040 is used to combine the third type laser S21 and the fourth type laser S22, and guides the combined third type laser S21 and the fourth type laser S22 to the first polarization selection lens 051. The polarization direction of the third type laser S21 and the fourth type laser S22 directed toward the first polarization selection lens 051 is the second polarization direction.

[0079] The first polarization selection lens 051 is used to reflect one of the laser beams with the first polarization direction and the laser beams with the second polarization direction, and to transmit the other of the laser beams with the first polarization direction and the laser beams with the second polarization direction.

[0080] For example, the first polarization selection lens 051 is used to reflect laser light with a first polarization direction (e.g., S-light) and transmit laser light with a second polarization direction (e.g., P-light).

[0081] By setting the polarization directions of both the first type of laser S11 and the second type of laser S12 to the first polarization direction, and setting the polarization directions of both the third type of laser S21 and the fourth type of laser S22 to the second polarization direction, and combining this with the polarization gating characteristics of the first polarization selection lens 051, both the first type of laser S11 and the second type of laser S12 in the first laser S1 can be reflected, while both the third type of laser S21 and the fourth type of laser S22 in the second laser S2 can be transmitted. This achieves the combining of the first laser S1 derived from the first beam combiner group 030 and the second laser S2 derived from the second beam combiner group 040, facilitating the combined use of the first laser 010 and the second laser 020.

[0082] Specifically, the red laser emitted by the first type of light-emitting unit G1 in the first laser 010 and the red laser emitted by the third type of light-emitting unit G3 in the second laser 020 are both P-lights, while the green and blue lasers emitted by the second type of light-emitting unit G2 in the first laser 010 and the green and blue lasers emitted by the fourth type of light-emitting unit G4 in the second laser 020 are both S-lights.

[0083] In order to reflect the first laser S1 and transmit the second laser S2 through the first polarization selection lens 051, in a feasible embodiment, the laser source 000 further includes a first half-wave plate 061 and a second half-wave plate 062. The first half-wave plate 061 is located on the light-emitting side of the first type of light-emitting unit G1, and the second half-wave plate 062 is located on the light-emitting side of the fourth type of light-emitting unit G4.

[0084] The first half-wave plate 061 can convert the first type laser S11 from P-beam to S-beam, and the second half-wave plate 062 can convert the fourth type laser S22 from S-beam to P-beam. In this way, the first polarization selection lens 051 can reflect both the first type laser S11 and the second type laser S12 in the first laser S1, and transmit both the third type laser S21 and the fourth type laser S22 in the second laser S2.

[0085] Please refer to Figure 5 In one feasible implementation, the first beam combining lens group 030 includes: a first beam combining lens 031 located on the light-emitting side of at least one row of first-type light-emitting units G1, and at least two second beam combining lenses 032. The at least two second beam combining lenses 032 are respectively distributed on the light-emitting side of at least two rows of second-type light-emitting units G2. The first beam combining lens 031, the at least two second beam combining lenses 032, and the first polarization selection lens 051 are arranged in a first direction.

[0086] The second beam combining lens group 040 includes: a third beam combining lens 041 located on the light-emitting side of at least one row of third-type light-emitting units G3, and a fourth beam combining lens 042 located on the light-emitting side of at least one row of fourth-type light-emitting units G4. The third beam combining lens 041, the fourth beam combining lens 042, and the first polarization selection lens 051 are arranged in the second direction.

[0087] The first direction intersects with the second direction.

[0088] For example, the first direction is perpendicular to the second direction. The first beam combining lens 031 and the third beam combining lens 041 are both reflective lenses, and the second beam combining lens 032 and the fourth beam combining lens 042 are both dichroic lenses.

[0089] like Figure 3 As shown, the first laser 010 includes two rows of first-type light-emitting units G1 and two rows of second-type light-emitting units G2. The first-type light-emitting units G1 are used to emit red laser R, one row of the two rows of second-type light-emitting units G2 is used to emit green laser G, and the other row of second-type light-emitting units G2 is used to emit blue laser B.

[0090] like Figure 4 As shown, the second laser 020 includes: one row of third-type light-emitting units G3 and one row of fourth-type light-emitting units G4. The third-type light-emitting units G3 are used to emit red laser R, and the fourth-type light-emitting units G4 are used to emit green laser G and blue laser B.

[0091] like Figure 5As shown, there is one first beam combining lens 031, which reflects the red laser emitted from the two rows of first-type light-emitting units G1 and guides the red laser to the second beam combining lens 032. There are two second beam combining lenses 032: one is a blue beam combining lens 0321, and the other is a green beam combining lens 0322. The blue beam combining lens 0321 is located between the first beam combining lens 031 and the green beam combining lens 0322. The blue beam combining lens 0321 reflects the blue laser emitted from one row of second-type light-emitting units G2 and transmits the red laser reflected by the first beam combining lens 031, guiding both the red and blue lasers to the green beam combining lens 0322. The green beam combining lens 0322 reflects the green laser emitted from the other row of second-type light-emitting units G2 and transmits the red and green lasers guided by the blue beam combining lens 0321, guiding all three lasers to the first polarization selection lens 051. There is one third beam combining lens 041, which is used to reflect the red laser emitted from the third type of light-emitting unit G3 to the fourth beam combining lens 042. There is one fourth beam combining lens 042, which is used to reflect the green and blue laser emitted from the fourth type of light-emitting unit G4, and reflect the red laser emitted from the third type of light-emitting unit G3, and guide the red, green and blue lasers to the first polarization selection lens 051.

[0092] Specifically, in one feasible implementation, the green and blue lasers emitted by the first laser 010 overlap, and two red laser beams emitted by the first laser 010 are located on either side of the overlapping green and blue lasers. Thus, after the first laser S1 emitted by the first laser 010 is combined by the first beam combiner group 030, the three-color beams in the first laser S1 are evenly distributed, resulting in uniform brightness distribution and good image quality. The red laser emitted by the second laser 020 overlaps with the laser beam formed by the green and blue lasers. Thus, after the second laser S2 emitted by the second laser 020 is combined by the second beam combiner group 040, the three-color beams in the second laser S2 are evenly distributed, resulting in uniform brightness distribution and good image quality.

[0093] Figure 6 This is a schematic diagram of a laser source 000 structure provided for another embodiment of this application. Please refer to... Figure 6 In one feasible implementation, the third beam combining lens group 050 includes: a second polarization selective lens 052 and a third polarization selective lens 053.

[0094] The first beam combiner group 030 is used to guide the first type of laser S11 to the second polarization selection lens 052, and to combine the second type of laser S12 emitted from at least two rows of second type of light-emitting units G2, and then guide the combined second type of laser S12 to the third polarization selection lens 053. The polarization direction of the first type of laser S11 directed to the second polarization selection lens 052 and the second type of laser S12 directed to the third polarization selection lens 053 are both the first polarization direction.

[0095] The second beam combining mirror group 040 is used to combine the third type laser S21 and the fourth type laser S22, and guides the combined third type laser S21 and the fourth type laser S22 to the second polarization selection lens 052. The polarization direction of the third type laser S21 and the fourth type laser S22 directed toward the second polarization selection lens 052 is the second polarization direction.

[0096] The second polarization selection lens 052 is used to reflect laser light with the first polarization direction and transmit laser light with the second polarization direction.

[0097] The third polarization selective lens 053 is located on the light-emitting side of the second polarization selective lens 052. The colors of the second type laser S12 and the fourth type laser S22 are both set colors. The third polarization selective lens 053 is used to reflect lasers with the first polarization direction and the set color, and to transmit lasers with the second polarization direction and lasers with the first polarization direction but not the set color.

[0098] By setting the polarization directions of the first type of laser S11 and the second type of laser S12 to the first polarization direction, and the polarization directions of the third type of laser S21 and the fourth type of laser S22 to the second polarization direction, and combining the second polarization selection lens 052 reflecting the laser with the first polarization direction (e.g., S-light) and transmitting the laser with the second polarization direction (e.g., P-light), and the third polarization selection lens 053 reflecting the laser with the first polarization direction and the set color and transmitting the laser with the second polarization direction, as well as the laser with the first polarization direction and the color not set, it is possible to combine the first laser S1 derived from the first beam combining mirror group 030 and the second laser S2 derived from the second beam combining mirror group 040, so that the first laser 010 and the second laser 020 can be used together.

[0099] As mentioned earlier, the first type of light-emitting unit G1 in the first laser 010 emits red laser light, and the two rows of second type light-emitting units G2 emit one row of green laser light and one row of blue laser light, respectively. The laser spot size emitted by the first laser 010 is relatively large, and the divergence angle of the red laser is larger than that of the green and blue lasers. The second polarization selection lens 052 and the third polarization selection lens 053 facilitate the adjustment of the red laser light, as well as the green and blue lasers, respectively, thereby facilitating the combined use of the first laser 010 and the second laser 020.

[0100] Specifically, the red laser emitted by the first type of light-emitting unit G1 in the first laser 010 and the red laser emitted by the third type of light-emitting unit G3 in the second laser 020 are both P-lights, while the green and blue lasers emitted by the second type of light-emitting unit G2 in the first laser 010 and the green and blue lasers emitted by the fourth type of light-emitting unit G4 in the second laser 020 are both S-lights.

[0101] To ensure that both the first type of laser S11 and the second type of laser S12 are lasers with a first polarization direction (i.e., S-beams), and both the third type of laser S21 and the fourth type of laser S22 are lasers with a second polarization direction (i.e., P-beams), in a feasible embodiment, the laser source 000 further includes: a first half-wave plate 061 and a second half-wave plate 062. The first half-wave plate 061 is located on the light-emitting side of the first type of light-emitting unit G1, and the second half-wave plate 062 is located on the light-emitting side of the fourth type of light-emitting unit G4.

[0102] Figure 7 This is a schematic diagram of another laser source 000 structure provided for another embodiment of this application. Please refer to... Figure 7 In one feasible embodiment, the first beam combining lens group 030 includes: a first beam combining lens 031 located on the light-emitting side of at least one row of first-type light-emitting units G1, and at least two second beam combining lenses 032. The at least two second beam combining lenses 032 are respectively distributed on the light-emitting side of at least two rows of second-type light-emitting units G2. The first beam combining lens 031 and the second polarization selection lens 052 are arranged in a first direction. The at least two second beam combining lenses 032 and the third polarization selection lens 053 are arranged in the first direction.

[0103] The second beam combining lens group 040 includes: a third beam combining lens 041 located on the light-emitting side of at least one row of third-type light-emitting units G3, and a fourth beam combining lens 042 located on the light-emitting side of at least one row of fourth-type light-emitting units G4. The third beam combining lens 041, the fourth beam combining lens 042, the second polarization selecting lens 052, and the third polarization selecting lens 053 are arranged in the second direction.

[0104] The first direction intersects with the second direction.

[0105] For example, the first direction is perpendicular to the second direction.

[0106] like Figure 3 As shown, the first laser 010 includes two rows of first-type light-emitting units G1 and two rows of second-type light-emitting units G2. The first-type light-emitting units G1 are used to emit red laser R, one row of the two rows of second-type light-emitting units G2 is used to emit green laser G, and the other row of second-type light-emitting units G2 is used to emit blue laser B.

[0107] like Figure 4 As shown, the second laser 020 includes: one row of third-type light-emitting units G3 and one row of fourth-type light-emitting units G4. The third-type light-emitting units G3 are used to emit red laser R, and the fourth-type light-emitting units G4 are used to emit green laser G and blue laser B.

[0108] like Figure 7 As shown, there is one first beam combining lens 031, used to reflect the red laser emitted from two rows of first-type light-emitting units G1 and guide the red laser to the second polarization selection lens 052. There are two second beam combining lenses 032: one is a blue beam combining lens 0321, and the other is a green beam combining lens 0322. The green beam combining lens 0322 is located between the blue beam combining lens 0321 and the third polarization selection lens 053. The blue beam combining lens 0321 is used to reflect the blue laser emitted from one row of second-type light-emitting units G2 and guide the blue laser to the green beam combining lens 0322. The green beam combining lens 0322 is used to reflect the green laser emitted from another row of second-type light-emitting units G2 and guide both the green and blue lasers to the third polarization selection lens 053. There is one third beam combining lens 041, used to reflect the red laser emitted from the third-type light-emitting unit G3 to the fourth beam combining lens 042. There is one fourth beam combining lens 042, which is used to reflect the green and blue laser emitted by the fourth type of light-emitting unit G4, and reflect the red laser emitted by the third type of light-emitting unit G3, and guide the red, green and blue lasers to the second polarization selection lens 052.

[0109] Specifically, in one feasible implementation, the green and blue lasers emitted by the first laser 010 overlap. The two red laser beams emitted by the first laser 010, after passing through the third polarization selective lens 053, are positioned on either side of the green and blue lasers in the first laser S1 reflected by the third polarization selective lens 053. Thus, after the first laser S1 emitted by the first laser 010 is combined by the first beam combiner group 030 and the third beam combiner group 050, the three-color beam distribution in the first laser S1 is uniform, resulting in uniform brightness distribution and good image quality. The red laser emitted by the second laser 020 overlaps with the laser beam formed by the green and blue lasers. Thus, after the second laser S2 emitted by the second laser 020 is combined by the second beam combiner group 040, the three-color beam distribution in the second laser S2 is uniform, resulting in uniform brightness distribution and good image quality.

[0110] For example, the second polarization selector lens 052 is a red-band polarization selector lens, which only polarizes red lasers and allows other non-red lasers to pass through. If the set color is blue-green, the third polarization selector lens 053 is a blue-green-band polarization selector lens, which only polarizes blue-green lasers and allows other non-blue-green lasers to pass through. Thus, through the second polarization selector lens 052 and the third polarization selector lens 053, the first laser S1 emitted from the first laser 010 and the second laser S2 emitted from the second laser 020 can both exit onto the side of the third polarization selector lens 053 opposite to the second polarization selector lens 052, thereby fully utilizing the laser energy of the laser source 000.

[0111] In one feasible embodiment, the laser light source 000 further includes a diffuser 070. The diffuser 070 is located on the light-emitting side of the third beam combiner group 050. The diffuser 070 is used to reduce the speckle effect of the projected image caused by laser coherence and to homogenize the light. After passing through the diffuser 070, the projected image will have higher display quality. Furthermore, the diffuser 070 can also improve fault tolerance.

[0112] The diffuser 070 is a diffuser wheel, which may be, for example, a rotatable diffuser plate.

[0113] In one feasible embodiment, the laser source 000 further includes a first lens 081, a second lens 082, and a third lens 083. The first lens 081 is located on the light-emitting side of the first beam combining mirror group 030, the second lens 082 is located on the light-emitting side of the second beam combining mirror group 040, and the third lens 083 is located on the light-emitting side of the diffuser 070.

[0114] The diffuser 070 has a converging region. The first lens 081 is used to focus the first laser S1 emitted from the first beam combining mirror group 030 into the converging region. The second lens 082 is used to focus the second laser S2 emitted from the second beam combining mirror group 040 into the converging region. The third lens 083 is used to collimate the first laser S1 and the second laser S2 emitted from the diffuser 070 to form parallel light.

[0115] In order for the third lens 083 to collimate both the first laser S1 and the second laser S2 emitted from the diffuser 070, the first lens 081, the second lens 082 and the third lens 083 all have positive optical power, and the focal points of the first lens 081, the second lens 082 and the third lens 083 all coincide on the diffuser 070, for example, on the side of the diffuser 070 near the third beam combining mirror group 050.

[0116] The first laser S1 emitted from the first laser 010 can be adjusted using the first lens 081 and the third lens 083. Similarly, the second laser S2 emitted from the second laser 020 can be adjusted using the second lens 082 and the third lens 083, so that the spot size and divergence angle of the first laser S1 after passing through the third lens 083 are matched with those of the second laser S2 after passing through the third lens 083. This ensures the combined effect of the first laser 010 and the second laser 020.

[0117] Please refer to Figure 5 Specifically, in one feasible implementation, the first lens 081, the second lens 082, and the third lens 083 have different surface shapes depending on the divergence angle of the incident beam and the area of ​​the light spot, but overall they all have the function of focusing the incident light. For example, the first lens 081, the second lens 082, and the third lens 083 are all focusing lenses.

[0118] The first lens 081 is located between the green light combining lens 0322 and the first polarization selection lens 051, the second lens 082 is located between the fourth light combining lens 042 and the first polarization selection lens 051, and the third lens 083 is located on the light-emitting side of the diffuser 070.

[0119] The first lens 081 and the third lens 083, as well as the second lens 082 and the third lens 083, together constitute two telescope systems. These two telescope systems have different adjustment magnifications and are used to shape multiple laser beams of different sizes and divergence angles. By adjusting the surface shape and focal length of the third lens 083, the entire beam of the two sets of tri-color packaged lasers can be controlled to a spot size and shape that matches the subsequent illumination system.

[0120] Figure 8This is a schematic diagram illustrating the selection principle of a first lens 081 and a second lens 082 provided for embodiments of this application. Please refer to... Figure 8 For example, the focal length of the first lens 081 can be larger, and the focal length of the second lens 082 can be smaller, so that the focal point of the first lens 081 and the focal point of the second lens 082 can coincide. Figure 8 Point O in the diagram is the coincident focal point, and the second lens 082 is located to the right of the first lens 081.

[0121] Figure 9 A schematic diagram of the laser beam distribution of the first laser 010 provided in the embodiments of this application. Figure 10 This is a schematic diagram of the laser beam distribution of the second laser 020 provided in an embodiment of this application.

[0122] Figure 9 A schematic diagram showing the spot size of the first laser S1 emitted by the first laser 010 in the x and y directions is displayed. Both the x and y directions are perpendicular to the optical axis of the first laser S1, and the x and y directions are perpendicular to each other, with the y direction corresponding to... Figure 5 The vertical direction in the middle.

[0123] Figure 10 This diagram illustrates the spot size of the second laser S2 emitted by the second laser 020 in the x and y directions. Both the x and y directions are perpendicular to the optical axis of the second laser S2, and the x and y directions are perpendicular to each other, with the y direction corresponding to... Figure 5 The horizontal direction in the middle.

[0124] For semiconductor lasers, the beam has different divergence angles in the mutually orthogonal x and y directions. The divergence angle in the y direction can be considered as 0°, while the divergence angle in the x direction is usually less than 10°.

[0125] This application focuses on combining two lasers with different beam divergence angles and sizes. Since the laser divergence angle in the y-direction is approximately 0°, and there is usually a divergence angle of less than 10° in the x-direction, this application mainly adjusts the divergence angle in the x-direction. Let the divergence angles in the x-direction of the first laser 010 and the second laser 020 be θ1 and θ2, respectively.

[0126] For the dual-lens telescope optical system formed by the first lens 081 and the third lens 083, as well as the second lens 082 and the third lens 083, the adjustment magnification and focal length have the relationship (1):

[0127] D in / D out =f in / f out (1)

[0128] There is a relationship between angular magnification and focal length (2):

[0129] tan(θ in ) / tan(θ out )=f out / f in (2)

[0130] Among them, f in f is the focal length of either the first lens 081 or the second lens 082. out Let θ be the focal length of the third lens 083. in θ is the divergence angle of the first laser S1 before it enters the first lens 081 or the divergence angle of the second laser S2 before it enters the second lens 082. out D is the divergence angle of the first laser S1 after exiting the third lens 083 or the divergence angle of the second laser S2 after exiting the third lens 083. in D represents the spot size of either the first laser S1 before it enters the first lens 081 or the second laser S2 before it enters the second lens 082. out The size of the spot after the first laser S1 exits through the third lens 083 or the size of the spot after the second laser S2 exits through the third lens 083.

[0131] This application can achieve matching of laser spot size and divergence angle by adjusting the focal length ratio of the first lens 081, the second lens 082 and the third lens 083.

[0132] Based on the principles of geometric optics, to provide a high-quality light source for the subsequent optical path of the projection optical system, the beams converged by the first lens 081 (converging the spot of the first laser S1) and the second lens 082 (converging the spot of the second laser S2) should be focused at the focal point O (i.e., the surface of the diffuser 070) at the same angle, so that the outgoing light from the third lens 083 has the same divergence angle in the x-direction. In this case, due to the limitations of the laser's own divergence angle and inherent spot size, the spot sizes of the two lasers (i.e., the first laser 010 and the second laser 020) may differ to some extent. Figure 5 Explanation: To ensure that the first laser 010 and the second laser 020 ultimately have the same divergence angle in the x-direction, the following expressions must hold simultaneously:

[0133] tan(θ1) / tan(θ out1 )=f out / f1 (3)

[0134] tan(θ2) / tan(θ out2 )=f out / f2 (4)

[0135] Among them, f1, f2, f outThe focal lengths of the first lens 081, the second lens 082, and the third lens 083 are θ1, θ2, and θ3, respectively. out1 θ out2 These are the divergence angles of the first laser S1 before it enters the first lens 081, the divergence angle of the second laser S2 before it enters the second lens 082, the divergence angle of the first laser S1 after it exits the third lens 083, and the divergence angle of the second laser S2 after it exits the third lens 083, respectively.

[0136] Simplifying the above equation, we get:

[0137] f1 / f2=tan(θ2) / tan(θ1) (5)

[0138] At this point, the adjustment factor for the spot size of the two lasers is also determined accordingly:

[0139] Γ1=f out / f1=x out1 / x1=y out / y1 (6)

[0140] Γ2=f out / f2=x out2 / x2=y out2 / y2 (7)

[0141] Wherein, Γ1 is the adjustment magnification of the first laser S1, for example, the reduction ratio of the first laser S1. Γ2 is the adjustment magnification of the second laser S2, for example, the magnification of the second laser S2. x1 is the spot size of the first laser S1 in the x-direction before it enters the first lens 081, x2 is the spot size of the second laser S2 in the x-direction before it enters the second lens 082, y1 is the spot size of the first laser S1 in the y-direction before it enters the first lens 081, and y2 is the spot size of the second laser S2 in the y-direction before it enters the second lens 082. out1 Let x be the size of the spot in the x-direction after the first laser S1 exits through the third lens 083. out2 The size of the spot in the x-direction after the second laser S2 exits through the third lens 083 is given by y. out1 The size of the spot in the y-direction after the first laser S1 exits through the third lens 083 is y. out2 The size of the spot in the y-direction after the second laser S2 exits through the third lens 083.

[0142] That is, the light spot shrinks proportionally in the x and y directions. The edges of the combined light spot coincide only when Γ1 / Γ2 = x2 / x1 = y2 / y1. In more general cases, the edges may not coincide. Therefore, this application introduces a diffuser 070. The diffuser 070 homogenizes the laser spot while also adjusting its size, eliminating non-uniformity caused by mismatched spot sizes. This results in a uniform rectangular light spot with the same divergence angle emitted from the third lens 083, completing the final beam combining.

[0143] Limited by the x and y dimensions of the laser spot and the divergence angle, when the desired homogenization effect cannot be achieved by matching the divergence angle, the principle of conservation of optical spread E can be used to achieve beam combining by reasonably allocating the output beam divergence angle and the spot size. When matching the optical spread, the relationship between the following three variables must be considered:

[0144] Es_total: Total optical expansion of laser source 000;

[0145] Es: The optical expansion amount of the laser source 000 after removing the diffuser 070. Since the scattering medium has the property of increasing the optical expansion amount, there exists Es_total=ηEs (η>1), where η is the optical expansion amount increase coefficient caused by the diffuser 070.

[0146] E_ill: The optical extension of the subsequent optical system connected to the laser source 000.

[0147] Since there is an inevitable difference in the optical path extension of the first laser S1 and the second laser S2, in order to avoid wasting optical energy, max(ηEs1,ηEs2)≤E_ill should hold. Here, Es1 represents the optical extension of the first laser S1, and Es2 represents the optical extension of the second laser S2.

[0148] Considering compatibility with subsequent lighting systems, the divergence angle θ of the two laser beams emitted from the third lens 083 in the y-direction, after being magnified / reduced by the telescope system, is... out1 θ out2 The difference should not exceed 5°. Meanwhile, due to limitations in the beam uniformity effect, x out1 / x out2 y out1 / y out2 It should be within the range of 2 / 3 to 4 / 3. Based on the above output light spot limitation, the limitation of the light source characteristics applicable to the light combining system of this application can be deduced.

[0149] It should be noted that the first laser 010 in the embodiments of this application is not limited to... Figure 3 The first laser 010 and the second laser 020 shown are not limited to... Figure 4The second laser 020 shown can also be adapted to more beam pattern arrays. When the aspect ratio (i.e., the xy-direction) is too large, making it impossible to simultaneously control both the x and y directions using a spherical lens while also considering the beam divergence angle, one or more sets of cylindrical lenses can be introduced for separate control in the x and y directions. For Figure 3 The laser beam array shown can also control the red laser, blue laser, and green laser separately to obtain a more uniform beam.

[0150] Please refer to Figure 7 Specifically, in another feasible embodiment, the first lens 081 includes a first sub-lens 0811 and a second sub-lens 0812. The first sub-lens 0811 is located between the first beam combining lens 031 and the second polarization selection lens 052, and the second sub-lens 0812 is located between the green beam combining lens 0322 and the third polarization selection lens 053.

[0151] The laser source 000 also includes an auxiliary lens 0813, which is located between the first beam combining lens 031 and the first type of light-emitting unit G1.

[0152] Among them, the auxiliary lens 0813 and the first sub-lens 0811 are both cylindrical lenses, while the second sub-lens 0812, the second lens 082, and the third lens 083 are all spherical lenses. The auxiliary lens 0813 and the first sub-lens 0811 form a cylindrical lens group, which can be adapted to various laser arrays and allows for adjustment of the length and width ratio of the first type of laser S11 while controlling the divergence angle of the first type of laser S11.

[0153] Specifically, the axis of the auxiliary lens 0813 is perpendicular to the axis of the first sub-lens 0811. The auxiliary lens 0813 is used to adjust the first type of laser S11 in the x-direction, and the first sub-lens 0811 is used to adjust the first type of laser S11 in the y-direction. The first type of laser S11 is reflected by the first beam combining lens 031 after passing through the auxiliary lens 0813, and then enters the first sub-lens 0811.

[0154] The auxiliary lens 0813 and the third lens 083 constitute a telescope system; the first sub-lens 0811 and the third lens 083 constitute a telescope system; the second sub-lens 0812 and the third lens 083 constitute a telescope system; and the second lens 082 and the third lens 083 constitute a telescope system.

[0155] For the first laser S1 in the x-direction, please refer to... Figure 8The first sub-lens 0811 and the second sub-lens 0812 in the second lens 082 have the same focal length, resulting in better light combining effect. In practice, to balance the spot size and divergence angle, their focal lengths may be different. If necessary, the second sub-lens 0812 or the second lens 082 can also be replaced with two cylindrical lenses with orthogonal axes.

[0156] Figure 11 A schematic diagram illustrating the selection principle of a second lens 082, a second sub-lens 0812, and an auxiliary lens 0813 provided in this application embodiment. For the first laser S1 in the y-direction, refer to... Figure 11 At this time, the focal length of the second sub-lens 0812 is less than the focal length of the auxiliary lens 0813, but greater than the focal length of the second lens 082.

[0157] Furthermore, in the embodiments of this application, in order to adapt to different focal lengths of the lenses, the position of the lenses can be changed relative to the optical path. For example, the second sub-lens 0812 can be placed on the side of the second beam combining lens 032 facing the first laser 010, and the positions of the auxiliary lens 0813 and the first sub-lens 0811 can be interchanged.

[0158] Please refer to Figure 5 In one feasible implementation, the laser source 000 further includes a deflection prism 090. The deflection prism 090 is located on the light-emitting side of the second laser 020, for example, between the second half-wave plate 062 and the second laser 020. The deflection prism 090 is used to adjust the arrangement of the red, green, and blue lasers in the second laser 020, making the spatial distribution of the three colors of laser S2 more uniform.

[0159] Figure 12 This is a schematic diagram of the principle of a prism 090 provided in an embodiment of this application. Figure 12 The lasers corresponding to the dotted lines are all green, and the lasers corresponding to the straight lines are all blue. Please refer to this. Figure 12 A reflective film is coated on both sides of the 090 prism to refract the blue laser on the far left, thereby transforming the BBGGG light spot into a BGGGB light spot. The prism will adjust the position of the red laser spot accordingly to ensure that the red light spot is not misaligned with the blue and green light spots.

[0160] In summary, the first laser emitted from the first laser is guided by the first beam combiner group to the third beam combiner group, and the second laser emitted from the second laser is guided by the second beam combiner group to the third beam combiner group. The third beam combiner group combines the first laser emitted from the first beam combiner group and the second laser emitted from the second beam combiner group. After the first and second lasers are combined by the third beam combiner group, different types of first and second lasers can be used together, which can make the laser source more flexible and allow the entire optical system to achieve a balance in terms of heat dissipation, light output intensity, beam quality, and cost.

[0161] This application also provides a laser projection device, including: any of the above-mentioned laser light source 000, light modulation device and projection lens.

[0162] The optical modulator is located on the light-emitting side of the laser source 000 and is used to modulate the light emitted from the laser source 000. The projection lens is located on the light-emitting side of the optical modulator. The optical modulator is a core component of the laser projection device, and may be, for example, a DMD chip.

[0163] When using two lasers in combination, using two high-power lasers simultaneously is costly and may exceed the limits of the DMD or projection lens in current projection equipment. For example, the DMD has a maximum power limit; exceeding this limit may reduce its lifespan or cause damage. Similarly, excessive power handling by the projection lens can degrade image quality. If two high-power lasers are used, reducing the laser operating current to match the power limit of the DMD or projection lens wastes laser performance and costs. Furthermore, laser operating current has a lower limit; approaching this limit too closely can lead to unstable light output. Using low-power, low-cost lasers requires combining multiple lasers to achieve the desired power, increasing size. The laser projection device of this application combines a high-power laser and a low-power laser within a specific power range, better balancing cost and performance matching between different lasers.

[0164] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0165] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A laser light source, characterized in that, include: The system comprises a first laser, a second laser, a first beam combiner group, a second beam combiner group, and a third beam combiner group; The first beam combining mirror group is located on the light-emitting side of the first laser. The first laser is used to emit a first laser beam toward the first beam combining mirror group. The first beam combining mirror group is used to guide the first laser beam to the third beam combining mirror group. The second beam combiner group is located on the light-emitting side of the second laser. The second laser is used to emit a second laser beam toward the second beam combiner group, and the second beam combiner group is used to guide the second laser beam toward the third beam combiner group. The third beam combining mirror group is used to combine the first laser beam exported from the first beam combining mirror group and the second laser beam exported from the second beam combining mirror group. Both the first laser and the second laser have multiple rows of light-emitting units, and the number of rows of light-emitting units in the first laser is greater than the number of rows of light-emitting units in the second laser.

2. The laser source according to claim 1, characterized in that, The first laser includes: at least one row of first-type light-emitting units and at least two rows of second-type light-emitting units; the first laser includes: a first-type laser emitted by the first-type light-emitting units and a second-type laser emitted by the second-type light-emitting units; The second laser includes: at least one row of third-type light-emitting units and at least one row of fourth-type light-emitting units; the second laser includes: third-type laser emitted by the third-type light-emitting units and fourth-type laser emitted by the fourth-type light-emitting units; The wavelength range of the first type of laser overlaps with that of the third type of laser, and the polarization directions of the first type of laser and the third type of laser directed toward the third beam combiner are different. The wavelength range of the second type of laser overlaps with that of the fourth type of laser, and the polarization directions of the second type of laser and the fourth type of laser directed toward the third beam combiner are different. The third beam combiner is used to reflect one of the first laser and the second laser, and to transmit the other of the first laser and the second laser.

3. The laser source according to claim 2, characterized in that, The third beam combining lens group includes: a first polarization selection lens; The first beam combining mirror group is used to combine the first type of laser and the second type of laser, and guides the combined first type of laser and the second type of laser to the first polarization selection lens. The polarization direction of the first type of laser and the second type of laser directed toward the first polarization selection lens is the first polarization direction. The second beam combining mirror group is used to combine the third type laser and the fourth type laser, and guides the combined third type laser and the fourth type laser to the first polarization selection lens. The polarization direction of the third type laser and the fourth type laser that are directed toward the first polarization selection lens is the second polarization direction. The first polarization-selective lens is used to reflect one of the laser beams in the first polarization direction and the laser beams in the second polarization direction, and to transmit the other of the laser beams in the first polarization direction and the laser beams in the second polarization direction.

4. The laser source according to claim 3, characterized in that, The first beam combining lens group includes: a first beam combining lens located on the light-emitting side of the at least one row of first-type light-emitting units, and at least two second beam combining lenses; the at least two second beam combining lenses are respectively distributed on the light-emitting side of the at least two rows of second-type light-emitting units; the first beam combining lens, the at least two second beam combining lenses, and the first polarization selection lens are arranged in a first direction; The second beam combining lens group includes: a third beam combining lens located on the light-emitting side of the at least one row of third type light-emitting units, and a fourth beam combining lens located on the light-emitting side of the at least one row of fourth type light-emitting units; the third beam combining lens, the fourth beam combining lens, and the first polarization selection lens are arranged in a second direction; Wherein, the first direction intersects with the second direction.

5. The laser source according to claim 2, characterized in that, The third beam combining lens group includes: a second polarization selection lens and a third polarization selection lens; The first beam combining mirror group is used to guide the first type of laser to the second polarization selection mirror, combine the second type of laser emitted from the at least two rows of second type of light-emitting units, and guide the combined second type of laser to the third polarization selection mirror; the polarization direction of the first type of laser directed toward the second polarization selection mirror and the second type of laser directed toward the third polarization selection mirror are both the first polarization direction; The second beam combining mirror group is used to combine the third type laser and the fourth type laser, and guides the combined third type laser and the fourth type laser to the second polarization selection lens. The polarization direction of the third type laser and the fourth type laser that are directed toward the second polarization selection lens is the second polarization direction. The second polarization selection lens is used to reflect laser light in the first polarization direction and transmit laser light in the second polarization direction; The third polarization selective lens is located on the light-emitting side of the second polarization selective lens. The colors of the second type of laser and the fourth type of laser are both set colors. The third polarization selective lens is used to reflect lasers with polarization direction of the first polarization direction and color of the set color, and to transmit lasers with polarization direction of the second polarization direction, as well as lasers with polarization direction of the first polarization direction and color that is not the set color.

6. The laser source according to claim 5, characterized in that, The first beam combining lens group includes: a first beam combining lens located on the light-emitting side of the at least one row of first-type light-emitting units, and at least two second beam combining lenses; the at least two second beam combining lenses are respectively distributed on the light-emitting side of the at least two rows of second-type light-emitting units; the first beam combining lens and the second polarization selection lens are arranged in a first direction; the at least two second beam combining lenses and the third polarization selection lens are arranged in the first direction; The second beam combining lens group includes: a third beam combining lens located on the light-emitting side of the at least one row of third type light-emitting units, and a fourth beam combining lens located on the light-emitting side of the at least one row of fourth type light-emitting units; the third beam combining lens, the fourth beam combining lens, the second polarization selective lens, and the third polarization selective lens are arranged in a second direction; Wherein, the first direction intersects with the second direction.

7. The laser light source according to any one of claims 2 to 6, characterized in that, The laser source further includes: a first half-wave plate and a second half-wave plate; the first half-wave plate is located on the light-emitting side of the first type of light-emitting unit, and the second half-wave plate is located on the light-emitting side of the fourth type of light-emitting unit.

8. The laser light source according to any one of claims 1 to 7, characterized in that, The laser source further includes a diffuser; the diffuser is located on the light-emitting side of the third beam combiner group.

9. The laser source according to claim 8, characterized in that, The laser source further includes: a first lens, a second lens, and a third lens; the first lens is located on the light-emitting side of the first beam combining mirror group, the second lens is located on the light-emitting side of the second beam combining mirror group, and the third lens is located on the light-emitting side of the diffuser. The diffuser has a converging region, the first lens is used to focus the first laser emitted from the first beam combiner group to the converging region, the second lens is used to focus the second laser emitted from the second beam combiner group to the converging region, and the third lens is used to collimate the first laser and the second laser emitted from the diffuser.

10. A laser projection device, characterized in that, include: The laser light source, optical modulation device, and projection lens according to any one of claims 1 to 9.

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