Laser light source device and projection system

Abstract

A laser light source device at least comprises a first laser (111), a second laser (112) and a light combining assembly (12). Each of the first laser (111) and the second laser (112) comprises a first light emitting area (c1) and a second light emitting area (c2). The first laser device (111) and the second laser device (112) are arranged along a first direction (x), a first light emitting area (c1) of the first laser device (111) and a second light emitting area (c2) of the second laser device (112) are arranged along the first direction (x), and a second light emitting area (c2) of the first laser device (111) and a first light emitting area (c1) of the second laser device (112) are arranged along the first direction (x). The light combining assembly (12) combines the laser emitted by the first light emitting area (c1) of the first laser device (111) and the laser emitted by the second light emitting area (c2) of the second laser device (112), combines the laser emitted by the second light emitting area (c2) of the first laser device (111) and the laser emitted by the first light emitting area (c1) of the second laser device (112), and emits along a first direction (x). The first direction (x) is parallel to the slow axis direction of the laser emitted by the laser. The invention further discloses a projection system comprising the laser light source. The size of the laser light source device in the light-emitting direction is reduced.

Description

Laser light source device and projection system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent applications filed with the State Intellectual Property Office of the People's Republic of China on September 28, 2023, with application number 202311281815.7, filed with the State Intellectual Property Office of the People's Republic of China on February 28, 2024, with application number 202420370139.4, and filed with the State Intellectual Property Office of the People's Republic of China on February 28, 2024, with application number 202410219541.7, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of projection technology, and in particular to a laser light source device and a projection system. Background Art

[0004] Projection display is a technology that uses a flat image to control the light source, utilizing an optical system and projection space to magnify the image and display it on the projection surface. With the development of projection display technology, it has gradually been applied to business activities, conferences and exhibitions, scientific education, military command, traffic management, centralized monitoring, advertising and entertainment, and other fields. Its advantages, such as large display size and clear display, also meet the requirements of large-screen display.

[0005] Laser light sources offer advantages over other light sources, such as wide color gamut and high brightness, making them increasingly popular in the projection field. Currently, mainstream lasers have evolved from monochromatic to trichromatic lasers. However, due to current laser design limitations, a single laser is insufficient for optimal use, requiring at least two lasers to combine their light.

[0006] Summary of the Invention

[0007] The present invention provides a laser light source device, comprising:

[0008] A light-emitting assembly includes a first laser and a second laser, each laser including multiple laser chips for emitting three-color laser light; the first laser and the second laser are arranged along a first direction; the multiple laser chips in each laser are arranged into a first light-emitting area and a second light-emitting area arranged along a second direction; the wavelengths of laser light emitted by the first light-emitting area and the second light-emitting area are different; the first light-emitting area of ​​the first laser and the second light-emitting area of ​​the second laser are arranged adjacent to each other along the first direction and are centrally aligned along the first direction; the second light-emitting area of ​​the first laser and the first light-emitting area of ​​the second laser are arranged adjacent to each other along the first direction and are centrally aligned along the first direction; the first direction and the second direction are perpendicular to each other;

[0009] A light combining component is located on the light emitting side of the first laser and the second laser, and is used to combine the laser light emitted from the first light emitting area of ​​the first laser with the laser light emitted from the second light emitting area of ​​the second laser, and combine the laser light emitted from the second light emitting area of ​​the first laser with the laser light emitted from the first light emitting area of ​​the second laser, and emit them along the first direction, where the first direction is parallel to the direction of the slow axis of the laser light. The divergence angle of the laser light emitted by the laser chip along the slow axis is smaller than the divergence angle along the fast axis, and the divergence angle of the laser light emitted by the light-emitting component along the slow axis is larger than the divergence angle along the fast axis.

[0010] The present invention further provides a laser light source device, comprising:

[0011] a first laser and a second laser, wherein the first laser is configured to emit at least two laser beams having different wavelengths, and the different laser beams emitted by the first laser have different polarization directions, and the laser beams emitted by the first laser include a first laser beam having a first wavelength;

[0012] The second laser is used to emit a second laser beam having the first wavelength, and the polarization direction of the second laser beam is the same as the polarization direction of the first laser beam;

[0013] a polarization light combining assembly, the polarization light combining assembly comprising a polarization adjustment element and a polarization light combining element, the polarization adjustment element being disposed on a light-emitting side of one of the first laser and the second laser to change a polarization direction of one of the first laser beam and the second laser beam, the polarization light combining element being located on a light-emitting path of the first laser and the second laser, and being configured to reflect one of the laser beam of the first laser and the laser beam of the second laser and transmit the laser beam of the other;

[0014] A light homogenizing component is used to homogenize the laser beam emitted by the polarization light combining element.

[0015] The present invention further provides a laser light source device, comprising:

[0016] A light-emitting assembly, wherein the light-emitting assembly includes a plurality of lasers, and the plurality of lasers emit laser beams;

[0017] a polarization light combining assembly, the polarization light combining assembly comprising a polarization light combining element and a polarization adjusting element, the polarization adjusting element being used to adjust the polarization directions of the laser beams of the plurality of laser portions so as to adjust the laser beams of the same polarization direction into laser beams of different polarization directions, and the polarization light combining element being used to combine the laser beams of different polarization directions;

[0018] The light homogenizing component is used to homogenize the laser beam after the combined light.

[0019] The embodiment of the present application further provides a projection system, comprising: any of the above-mentioned laser light source devices, an illumination system, and a projection lens;

[0020] The lighting system includes: a light homogenizing element, a shaping lens and a light modulator located on the light output side of the laser light source device;

[0021] The projection lens is located on the light-emitting side of the light modulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic diagram of a planar structure of a laser provided in an embodiment of the present application;

[0023] FIG2 is a second schematic diagram of the planar structure of a laser provided in an embodiment of the present application;

[0024] FIG3 is a schematic diagram of the arrangement of lasers in the related art;

[0025] FIG4 is a schematic diagram of the combined light path of the laser shown in FIG3 ;

[0026] FIG5a is a schematic diagram of a combined light spot of the combined light path shown in FIG4;

[0027] FIG5 b is a schematic diagram of the light output path of the laser chip provided in an embodiment of the present application;

[0028] FIG6 is a schematic diagram of one arrangement of lasers provided in an embodiment of the present application;

[0029] FIG7 is a second schematic diagram of the arrangement of the lasers provided in an embodiment of the present application;

[0030] FIG8 is a schematic diagram of a structure of a laser light source device according to an embodiment of the present application;

[0031] FIG9 is a side structural schematic diagram of the laser light source device shown in FIG8 ;

[0032] FIG10 is a second structural schematic diagram of a laser light source device provided in an embodiment of the present application;

[0033] FIG11 is a schematic diagram of the optical path principle of a transparent flat plate provided in an embodiment of the present application;

[0034] FIG12 is a schematic diagram of a combined light spot of the combined light path shown in FIG10 ;

[0035] FIG13 is a third structural schematic diagram of a laser light source device provided in an embodiment of the present application;

[0036] FIG14 is a side structural schematic diagram of the laser light source device shown in FIG13;

[0037] FIG15 is a fourth structural diagram of a laser light source device provided in an embodiment of the present application;

[0038] FIG16 is a schematic diagram of the optical path principle of a prism provided in an embodiment of the present application;

[0039] FIG17 is a schematic diagram of a light spot of the light path shown in FIG16 ;

[0040] FIG18 is a fifth structural diagram of a laser light source device provided in an embodiment of the present application;

[0041] FIG19 is a schematic side view of the structure of the laser light source device shown in FIG18;

[0042] FIG20 is a sixth structural diagram of a laser light source device provided in an embodiment of the present application;

[0043] FIG21 is a seventh structural diagram of a laser light source device provided in an embodiment of the present application;

[0044] FIG22 is an eighth structural diagram of a laser light source device provided in an embodiment of the present application;

[0045] FIG23 is a ninth structural diagram of a laser light source device provided in an embodiment of the present application;

[0046] FIG24 is a schematic side view of the structure of the laser light source device shown in FIG23;

[0047] FIG25 is a tenth structural diagram of a laser light source device provided in an embodiment of the present application;

[0048] FIG26 is a side view schematic diagram of the structure of the laser light source device shown in FIG25;

[0049] FIG27 is a schematic diagram of a combined light spot provided in an embodiment of the present application;

[0050] FIG28 is an eleventh structural diagram of a laser light source device provided in an embodiment of the present application;

[0051] FIG29 is a twelfth structural diagram of a laser light source device provided in an embodiment of the present application;

[0052] FIG30 is a schematic diagram of the structure of a projection system provided in an embodiment of the present application;

[0053] FIG31 is a schematic structural diagram of a light source device;

[0054] FIG32 is a thirteenth structural diagram of a laser light source device provided in an embodiment of the present application;

[0055] FIG33 is a fourteenth structural diagram of a laser light source device provided in an embodiment of the present application;

[0056] FIG34 is a fifteenth structural diagram of a laser light source device provided in an embodiment of the present application;

[0057] FIG35 is a sixteenth structural diagram of a laser light source device provided in an embodiment of the present application;

[0058] FIG36 is a seventeenth structural diagram of a laser light source device provided in an embodiment of the present application;

[0059] FIG37 is a light spot diagram of the first laser before light combination provided in an embodiment of the present application;

[0060] FIG38 is a light spot diagram after combining the light of the first laser and the second laser provided in an embodiment of the present application;

[0061] FIG39 is an eighteenth structural diagram of a laser light source device provided in an embodiment of the present application;

[0062] FIG40 is a nineteenth structural diagram of a laser light source device provided in an embodiment of the present application;

[0063] FIG41 is a twentieth structural diagram of a laser light source device provided in an embodiment of the present application;

[0064] Figure 42 is the twenty-first structural schematic diagram of the laser light source device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0065] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present application more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in this application are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of this application. The drawings in this application are only used to illustrate relative position relationships and do not represent true proportions.

[0066] Projection display is a technology that uses a flat image to control the light source, utilizing an optical system and projection space to magnify the image and display it on the projection surface. With the development of projection display technology, it has gradually been applied to business activities, conferences and exhibitions, scientific education, military command, traffic management, centralized monitoring, advertising and entertainment, and other fields. Its advantages, such as large display size and clear display, also meet the requirements of large-screen display.

[0067] Laser light sources offer advantages over other light sources, such as high color gamut and high brightness, making them increasingly popular in the projection field. Multi-chip LD (MCL) lasers offer advantages such as compact size, high integration, and low cost.

[0068] Current MCL lasers usually include multiple laser chips, which can be arranged in an array to form multiple rows and columns and encapsulated in a frame. A reflector can be set on the light-emitting side of the laser chip. The reflector can reflect the laser emitted by the corresponding laser chip, and then collimate it through a collimating lens before emitting it.

[0069] The laser chip in the laser can include multiple types, each configured to emit laser light of different wavelengths. As shown in Figures 1 and 2 , the laser can include a first laser chip x1, a second laser chip x2, and a third laser chip x3. The first laser chip x1, the second laser chip x2, and the third laser chip x3 each emit laser light of different wavelengths.

[0070] In some embodiments, as shown in FIG1 , the number of first laser chips x1 is greater than the number of second laser chips x2 and also greater than the number of third laser chips x3. The first laser chips x1 are arranged in a row, and the second laser chips x2 and the third laser chips x3 are arranged in a row.

[0071] 2 , the number of first laser chips x1 is the sum of the number of third laser chips x3 and the number of second laser chips x2. The first laser chips x1 are arranged in two rows, the second laser chips x2 are arranged in one row, and the third laser chips x3 are arranged in one row.

[0072] Optionally, the first laser chip x1 may be a red laser chip, the second laser chip x2 may be a green laser chip, and the third laser chip x3 may be a blue laser chip. The red laser chip may emit red laser light, the green laser chip may emit green laser light, and the blue laser chip may emit blue laser light.

[0073] It is worth noting that the arrangement of the laser chips shown in Figures 1 and 2 is for illustrative purposes only. In actual applications, the types of laser chips included in the laser, the wavelength of the laser emitted by each laser chip, the number of each laser chip, and the arrangement are not restricted.

[0074] In order to improve the brightness of the light output of the projection device, a single laser cannot meet the usage requirements, and at least two lasers are required to combine the light. When the two lasers shown in Figure 1 are combined, the arrangement method is shown in Figure 3. As shown in Figure 3, for easy distinction, the two lasers are divided into a first laser 111 and a second laser 112. The first laser 111 and the second laser 112 are arranged along a first direction x. The overall shape of the laser frame is rectangular, and the long sides of the first laser 111 and the second laser 112 are parallel to the first direction x. The first laser 111 and the second laser 112 are arranged in the same direction along the first direction x.

[0075] Figure 4 is a schematic diagram of the light path of the laser shown in Figure 3. As shown in Figure 4, when the first laser 111 and the second laser 112 are combined, a first component 121 is set on the light-emitting side of the first laser 111, and a second component 122 is set on the light-emitting side of the second laser 112. In order to avoid blocking light, the first component 121 and the second component 122 need to be staggered in the third direction z. The first component 121 can combine the lasers of different wavelengths emitted by the first laser 111 and emit them along the first direction x, and the second component 122 can combine the lasers of different wavelengths emitted by the second laser 112 and emit them along the first direction x. The light spot after combining is shown in Figure 5a, where the light spot after combining the lasers emitted by the first laser 111 corresponds to a row of light spots at the bottom of Figure 5a, and the light spot after combining the lasers emitted by the second laser 112 corresponds to a row of light spots at the top of Figure 5a. The laser beams after combining also need to be converged by the lens 13, and enter the light-homogenizing element 21 after passing through the diffuser 14.

[0076] The lasers used in laser light source devices are mostly semiconductor lasers. As shown in Figure 5b, the laser chip a is composed of multiple stacked semiconductor layers. Laser light is emitted from the end face of the laser chip. The laser light emitted by the laser chip has a certain divergence angle, and the degree of divergence varies in different directions. The divergence angle is relatively large in the direction parallel to the plane of the laser chip's stacked structure, and relatively small in the direction parallel to the stacking direction. This causes the laser light emitted by the laser chip to form an elliptical spot pattern when it enters the reflector f. The major axis of the ellipse corresponds to the direction of the larger laser divergence angle, which can be called the laser's fast axis direction, while the minor axis of the ellipse corresponds to the direction of the smaller laser divergence angle, which can be called the laser's slow axis direction. The reflector reflects the laser light toward the laser's light-emitting surface. The laser light also needs to be collimated by a collimating lens t before it can be emitted. The collimating lens is usually designed for the laser's divergence angle in the fast axis direction. Therefore, the divergence angle of the laser light emitted by the collimating lens t in the fast axis direction is smaller than the divergence angle in the slow axis direction. The long side of the laser shown in FIG3 is parallel to the first direction x. According to the above analysis, the fast axis direction of the laser emitted by the laser is parallel to the first direction x, and the slow axis direction is parallel to the second direction y.

[0077] As shown in Figures 3 and 4, the lasers are arranged along a first direction x, and the long sides of the lasers are parallel to the first direction x, so that the fast axis direction of the lasers emitted by the lasers is parallel to the first direction x. Therefore, the lasers combine light along the fast axis direction of the lasers, resulting in a larger size of the combined light path along the first direction x. Since the first component 121 and the second component 122 need to avoid overlapping in the third direction z, the size of the combined light path in the third direction z is larger, resulting in a larger volume of the combined light path.

[0078] In view of this, an embodiment of the present application provides a laser light source device that can combine light along the slow axis direction of the laser, which is beneficial for reducing the volume of the combined light path.

[0079] FIG6 is one of the schematic diagrams of the arrangement of the laser provided in an embodiment of the present application; FIG7 is a second schematic diagram of the arrangement of the laser provided in an embodiment of the present application.

[0080] The laser light source device provided in an embodiment of the present application includes a light-emitting component, which includes at least two lasers, namely a first laser 111 and a second laser 112. The first laser 111 and the second laser 112 can be the lasers shown in Figure 1, the lasers shown in Figure 2, or lasers with other arrangement structures.

[0081] The laser includes a light-emitting device and a mounting substrate. The light-emitting device includes a frame, a cover plate, and a collimating lens. The frame contains a laser chip and a reflector. The cover plate and the frame form a closed space. The collimating lens is located on the cover plate and can be used to collimate the emitted laser. The mounting substrate includes a connection pattern and an electrical connection area for mounting the light-emitting device and achieving electrical connection of the light-emitting device. The laser frame is generally rectangular, including two mutually parallel first sides and two mutually parallel second sides, wherein the length of the first side is greater than the length of the second side.

[0082] As shown in Figures 6 and 7, the first laser 111 and the second laser 112 are arranged along a first direction x, the second sides of the first laser 111 and the second laser 112 are parallel to the first direction x, and the first laser 111 and the second laser 112 are arranged in opposite directions along the second direction y, and the first sides of the first laser 111 and the second laser 112 are arranged adjacent to each other. The first direction x and the second direction y are perpendicular to each other.

[0083] As can be seen from the above analysis, the long side (first side) direction of the laser is parallel to the fast axis direction of the emitted laser, and the short side (second side) direction of the laser is parallel to the slow axis direction of the emitted laser. According to the arrangement of the above lasers, the slow axis of the laser emitted by the first laser 111 and the second laser 112 is parallel to the first direction x. The first laser 111 and the second laser 112 each include a plurality of laser chips, which are arranged in an array along the first direction x and the second direction y to form a first light exit area c1 and a second light exit area c2 arranged along the second direction, and a plurality of laser chips are provided in the first light exit area c1 and the second light exit area c2. Among them, the first light exit area c1 of the first laser 111 and the second light exit area c2 of the second laser 112 are aligned along the first direction x, and the second light exit area c2 of the first laser 111 and the first light exit area c1 of the second laser 112 are aligned along the first direction x.

[0084] For different types of lasers, the number and arrangement rules of the laser chips disposed in the first light emitting area c1 and the second light emitting area c2 are different.

[0085] The laser shown in Figure 6 can include three laser chips arranged in two rows: a first laser chip x1, a second laser chip x2, and a third laser chip x3. The first laser chip x1 is located in a first light-emitting area c1, while the second laser chip x2 and the third laser chip x3 are located in a second light-emitting area c1. The first laser chips x1 in the first light-emitting area c1 are arranged along a first direction x to form a first laser chip row l1. The second laser chips x2 and the third laser chips x3 in the second light-emitting area c2 are arranged along the first direction x to form a second laser chip row l2. The first laser chip row l1 and the second laser chip row l2 are arranged along a second direction y.

[0086] The laser shown in Figure 7 can include three laser chips arranged in four rows: a first laser chip x1, a second laser chip x2, and a third laser chip x3. The first laser chip x1 is located in a first light-emitting area c1, and the second laser chip x2 and the third laser chip x3 are located in a second light-emitting area c1. The first laser chips x1 in the first light-emitting area c1 are arranged in two rows (l1 and l2) along a first direction x. The third laser chips x3 in the second light-emitting area c2 are arranged in a row (l3) along the first direction x. The second laser chips x2 in the second light-emitting area c2 are arranged in a row along the first direction x. The four laser chip rows (l1, l2, l3, and l4) are arranged along a second direction y.

[0087] The following description specifically describes the light combining path in the laser light source device by taking the laser light source device as shown in FIG6 as an example.

[0088] FIG8 is one of the structural schematic diagrams of the laser light source device provided in an embodiment of the present application; FIG9 is a side structural schematic diagram of the laser light source device shown in FIG8 .

[0089] As shown in Figures 8 and 9, the laser light source device also includes: a light combining component 12 located on the light emitting side of the first laser 111 and the second laser 112. The light combining component 12 can combine the laser emitted from the first light emitting area c1 of the first laser 111 and the laser emitted from the second light emitting area c2 of the second laser 112, combine the laser emitted from the second light emitting area c2 of the first laser 111 and the laser emitted from the first light emitting area c1 of the second laser 112, and emit the combined laser beams along the first direction x, thereby realizing light combining along the slow axis direction of the laser.

[0090] By adopting the arrangement of lasers provided in the embodiments of the present application and combining them with a light combining component, the different light emitting areas of the two lasers arranged along the first direction x can be combined along the slow axis direction of the laser, so that the lasers emitted from the different light emitting areas are folded along the slow axis direction, thereby facilitating the reduction of the size of the laser light source device along the first direction, thereby reducing the volume of the light combining optical path. Since the laser chips of different lasers have differences in divergence angles and wavelengths, the first light emitting area of ​​the first laser and the second light emitting area of ​​the second laser are combined, and the second light emitting area of ​​the first laser is combined with the first light emitting area of ​​the second laser, which is to combine the lasers emitted by different lasers, thereby diversifying the divergence angle and wavelength of the combined light beam, destroying the strong coherence of the laser, and thus improving the homogenization effect.

[0091] In some embodiments, as shown in Figures 8 and 9, the first laser 111 and the second laser 112 are arranged side by side and have the same light emission direction. The light combining component 12 includes: a first component and a second component, the first component is located on the light emission side of the first light emission area c1 of the first laser 111 and the second light emission area c2 of the second laser 112, and the second component is located on the light emission side of the second light emission area c2 of the first laser 111 and the first light emission area c1 of the second laser 112. The first component is used to combine the laser light emitted from the first light emission area c1 of the first laser 111 with the laser light emitted from the second light emission area c2 of the second laser 112; the second component is used to combine the laser light emitted from the second light emission area c2 of the first laser 111 with the laser light emitted from the first light emission area c1 of the second laser 112.

[0092] In some embodiments, as shown in Figures 8 and 9, the first component includes: a first reflector 121f1, a first light combining element 121h and a second reflector 121f2; the first reflector 121f1 is located on the light-emitting side of the second light-emitting area c2 of the second laser 122, the first light combining element 121h is located on the light-emitting side of the first light-emitting area c1 of the first laser 111, and the second reflector 121f2 is located on the light-emitting side of the first light combining element 121h; the first reflector 121f1, the first light combining element 121h and the second reflector 121f2 are arranged parallel to each other and inclined 45 degrees relative to the plane where the lasers are located.

[0093] As shown in Figure 8, the first reflector 121f1 can receive the laser emitted from the second light emitting area c2 of the second laser 112 and reflect it toward the first light combining element 121h. The first light combining element 121h combines the laser emitted from the second light emitting area c2 of the second laser 112 with the laser emitted from the first light emitting area c1 of the first laser 111 and emits them toward the second reflector 121f2. The second reflector 121f2 then reflects the received combined laser beam along the first direction x, that is, emits it along the slow axis direction of the laser.

[0094] Similarly, the second component includes a third reflector 122f1, a second light-combining element 122h, and a fourth reflector 122f2. The third reflector 122f1 is located on the light-emitting side of the second light-emitting area c2 of the first laser 111, the second light-combining element 122h is located on the light-emitting side of the first light-emitting area c1 of the second laser 112, and the fourth reflector 122f2 is located on the light-emitting side of the second light-combining element 122h. The third reflector 122f1 and the second light-combining element 122h are arranged parallel to each other, and the fourth reflector 122f2 is arranged parallel to the second reflector 121f2. The third reflector 122f1, the second light-combining element 122h, and the fourth reflector 122f2 are tilted 45 degrees relative to the plane of the lasers, but the fourth reflector 122f2 is tilted in the opposite direction to the third reflector 122f1 and the second light-combining element 122h.

[0095] As shown in Figure 8, the third reflector 122f1 can receive the laser emitted from the second light emitting area c2 of the first laser 111 and reflect it to the second light combining element 122h. The second light combining element 122h combines the laser emitted from the second light emitting area c2 of the first laser 111 and the laser emitted from the first light emitting area c1 of the second laser 112, and emits them to the fourth reflector 122f2. The fourth reflector 122f2 then emits the received combined laser beam in the same direction as the light emitting direction of the first component.

[0096] As described above, the first laser chip is disposed within the first light-emitting area c1, and the second and third laser chips are disposed within the second light-emitting area c2. The first laser chip can be a red laser chip, the second laser chip can be a green laser chip, and the third laser chip can be a blue laser chip. Therefore, the first light-emitting area c1 can emit red laser light, and the second light-emitting area c2 can emit green and blue laser light. The first light-combining element 121h and the second light-combining element 122h are used to combine the red laser light with the green and blue laser light.

[0097] As shown in Figure 8, the first light combining component 121h and the second light combining component 122h are both arranged on the light output side of the red laser chip to combine the three-color lasers. Since the divergence angle of the red laser is greater than the divergence angles of the green laser and the blue laser, and the longer the optical path of the laser, the greater its divergence degree. Therefore, the first light combining component 121h and the second light combining component 122h are arranged on the light output side of the red laser chip, and finally the three-color lasers are combined. This can make the optical path of the red laser shorter than the optical path of the green laser and the blue laser, so that the divergence degree of the red laser after combining is not too large, and the difference in the divergence degree of the red laser and the green laser and the blue laser is reduced.

[0098] In some embodiments, the first component and the second component can also be set in reverse, so that the first light combining component 121h and the second light combining component 122h are set on the light output side of the second light output area to combine lasers of different colors, so that the combined laser light beam is emitted in the opposite direction of that shown in Figure 8.

[0099] In some embodiments, the first light combining element 121h and the second light combining element 122h may be formed of dichroic films, dichroic mirrors, polarized light combining films or polarized light combining mirrors for transmitting red laser light and reflecting green laser light and blue laser light.

[0100] Dichroic films and mirrors can be coated using a coating process. Typically, a film material with an appropriate refractive index is selected to form a thin film of a specific thickness. The product of the film's refractive index and thickness is sufficient to enhance the transmission or reflection of light of a specific wavelength. For the laser structure described above, a dichroic film or mirror can enhance the transmission of red lasers and enhance the reflection of green and blue lasers.

[0101] Polarization combining films or polarization combining filters can transmit light with a first polarization direction and reflect light with a second polarization direction, with the first and second polarization directions being perpendicular to each other. Lasers emit polarized light, and different laser chips can emit light with different polarization directions. When a laser can emit both first and second polarizations, a polarization combining film or polarization combining filter can be used to combine the light.

[0102] In some embodiments, the laser light emitted by the first laser chip (red laser chip) is first polarized light, and the laser light emitted by the second laser chip (green laser chip) and the third laser chip (blue laser chip) is second polarized light. Therefore, the polarized light combining film or polarized light combining mirror can combine the laser light emitted by the three laser chips.

[0103] The first polarized light can be P-polarized light, and the second polarized light can be 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. Typically, the red laser light emitted by a red laser chip can be P-polarized light, the green laser light emitted by a green laser chip can be S-polarized light, and the blue laser light emitted by a blue laser chip can be S-polarized light.

[0104] The second reflector 121f2 and the fourth reflector 122f2 may be reflective films or reflective mirrors. The first reflector 121f1 and the third reflector 122f1 may be reflective films or reflective mirrors.

[0105] In some embodiments, the tilt directions of the second reflector 121f2 and the fourth reflector 122f2 in FIG. 8 are changed so that the second reflector 121f2 and the fourth reflector 122f2 are tilted relative to the plane where the laser is located in the second direction y, so that the second reflector 121f2 and the fourth reflector 122f2 can emit the combined laser beam along the second direction y.

[0106] In some embodiments, by changing the specific components, positions, and tilt directions included in the first component and the second component, the laser beam after the first laser 111 and the second laser 112 are combined can be emitted along the third direction z. For example, the first component includes a first reflector and a first light combiner, the first reflector reflects the laser light emitted from the second light emitting area of ​​the second laser toward the first light combiner, and the first light combiner combines the laser light emitted from the second light emitting area of ​​the second laser with the laser light emitted from the first light emitting area of ​​the first laser and emits them directly along the third direction z. The second component includes a second reflector and a second light combiner, the second reflector reflects the laser light emitted from the first light emitting area of ​​the second laser toward the second light combiner, and the second light combiner combines the laser light emitted from the first light emitting area of ​​the second laser with the laser light emitted from the second light emitting area of ​​the first laser and emits them directly along the third direction z.

[0107] It can be seen that the specific components, setting positions and tilt directions included in the light combining assembly can be adjusted accordingly according to the light output direction required by the laser light source device. The embodiments of the present application do not limit the specific structure of the light combining assembly.

[0108] In some embodiments, the first reflector 121f1 and the third reflector 122f1 can be transparent flat plates, and the function of reflecting light can be achieved by coating the surface of the transparent flat plates. At the same time, by reasonably selecting the material and thickness of the transparent flat plates, the coating can also be used to achieve the transfer of the light spot position, so that the combined light spot distribution is symmetrical, which is conducive to improving the homogenization effect.

[0109] Figure 10 is a second structural schematic diagram of the laser light source device provided in an embodiment of the present application; Figure 11 is a schematic diagram of the optical path principle of the transparent flat plate provided in an embodiment of the present application; and Figure 12 is a schematic diagram of the combined light spot of the combined light path shown in Figure 10.

[0110] In the laser shown in Figure 6, the third laser chip x3 and the second laser chip x2 are located in the second laser chip row l2. There are two third laser chips x3 and three second laser chips x2. Because the number of third laser chips x3 and second laser chips x2 is different and they are arranged in a concentrated manner, the laser beam emitted by the second laser chip row l2 contains two colors, resulting in an uneven color distribution in the combined light spot after combining with the laser beam emitted by the first laser chip x1.

[0111] To overcome the above issues, as shown in Figures 10 and 11, both the first reflector 121f1 and the third reflector 122f1 can be transparent flat plates. The transparent plates include a first surface s1 and a second surface s2, which are parallel to each other. The first surface s1 faces the second laser chip row l2, while the second surface s2 faces away from the second laser chip row l2. A first film layer m1 is provided on the first surface s1 to transmit the laser light emitted by the third laser chip x3 and reflect the laser light emitted by the second laser chip x2. A second film layer m2 is provided on the second surface s2 to reflect incident light.

[0112] In some embodiments, the first laser chip is a red laser chip, the second laser chip is a green laser chip, and the third laser chip is a blue laser chip. As shown in FIG11 , when the blue laser light b emitted by the blue laser chip (third laser chip x3) in the second laser chip row and the green laser light g emitted by the green laser chip (second laser chip x2) are incident on the first surface s1 of the transparent plate, the green laser light g is reflected by the first film layer m1, and the blue laser light is incident on the interior of the transparent plate. By selecting a reasonable material to make the transparent plate and setting the thickness of the transparent plate, the blue laser light b incident on the transparent plate can be reflected by the second film layer m2 on the second surface s2 and then emitted from the first surface s1, and the emitted blue laser light b is emitted from the gap between the green laser light g, so that the arrangement of the light spots after the combined light is as shown in FIG12 , wherein the green light spots G and the blue light spots B are arranged alternately, so that the color distribution of the light spots after the combined light is symmetrical, which is more conducive to subsequent light uniformity.

[0113] As shown in Figure 11, when a blue laser is incident from air into a transparent plate, it will be refracted and satisfy the refraction law: sinθi=n×sinθo;

[0114] Here, θi represents the angle of incidence, θo represents the angle of refraction, and n represents the refractive index of the transparent plate.

[0115] To ensure the combined light beams have the same exit direction, the components in the light-combining assembly are typically tilted 45° relative to the plane of the lasers. Therefore, the incident angles of the blue laser b and the green laser g on the first surface s1 of the transparent plate are both 45°, i.e., θi = 45°.

[0116] From this we can calculate:

[0117] According to the trigonometric function relationship, we can also get:

[0118] Where s represents the distance the blue laser travels after passing through the transparent plate, and d represents the thickness of the transparent plate.

[0119] If the distance between two adjacent laser beams when they are emitted from the laser is a, then the limit position of the blue laser movement is not to exceed the edge of the green laser, and the optimal movement position is in the middle of the green laser, corresponding to s needs to satisfy: 2a≤s≤3a;

[0120] Therefore, the refractive index and thickness of the transparent plate satisfy:

[0121] Assuming a = 1 mm, the above formula can be changed to 4n 2 -2≤d 2 ≤9n 2 -4.5.

[0122] FIG13 is a third structural schematic diagram of the laser light source device provided in an embodiment of the present application; FIG14 is a side structural schematic diagram of the laser light source device shown in FIG13 .

[0123] In some embodiments, as shown in Figures 13 and 14 , the first laser 111 and the second laser 112 are arranged side by side and have the same light emission direction. The light combining assembly includes a reflector 12f and a light combining assembly 12h. The reflector 12f is located on the light emission side of the first laser 111 and the second laser 112, and the light combining assembly 12h is located between the reflector 12f and the first laser 111. The reflector 12f and the light combining assembly 12h are parallel to each other and are arranged at an angle relative to the plane of the lasers.

[0124] The width of the reflector 12f along the first direction x is greater than the width of the light combiner 12h along the first direction. The reflector 12f is divided into an upper portion 12fu and a lower portion 12fd. The upper portion of the reflector 12fu is configured to correspond to the first laser 111, and the lower portion 12fd is configured to correspond to the second laser 112. The light combiner 12h is divided into a first portion 12h1 and a second portion 12h2. The first portion 12h1 of the light combiner is configured to correspond to the first light output area c1 of the first laser 111, and the second portion 12h2 of the light combiner is configured to correspond to the second light output area c2 of the first laser 111.

[0125] As shown in Figure 13, the lower part 12fd of the reflector receives the laser emitted from the second light emitting area of ​​the second laser 112 and reflects it toward the first part 12h1 of the light combiner. The lower part 12fd of the reflector also receives the laser emitted from the first light emitting area of ​​the second laser 112 and reflects it toward the second part 12h2 of the light combiner. The first part 12h1 of the light combiner combines the laser emitted from the second light emitting area of ​​the second laser 112 and the laser emitted from the first light emitting area of ​​the first laser 111, and emits them toward the upper part 12fu of the first reflector. The second part 12h2 of the light combiner combines the laser emitted from the first light emitting area of ​​the second laser 112 and the laser emitted from the second light emitting area of ​​the first laser 111, and emits them toward the upper part 12fu of the reflector. The upper part 12fu of the reflector then reflects the received combined laser beam along the first direction x and combines it along the slow axis direction of the laser.

[0126] In some embodiments, the first light emitting area can emit red laser, and the second light emitting area can emit green laser and blue laser. Then the reflector 12f can adopt a reflective film or a reflective mirror to reflect the full-band light, and the upper and lower parts of the reflector 12f can also be divided into two parts. The light combining element 12h can adopt a dichroic film or a dichroic mirror, and the use of a partitioned coating method can reduce the number of components used. Of course, the first and second parts of the light combining element can also be respectively set to two light combining elements corresponding to the first light emitting area and the second light emitting area of ​​the first laser. Among them, the first part 12h1 of the light combining element is used to transmit red laser and reflect green laser and blue laser; the second part 12h2 of the light combining element is used to transmit green laser and blue laser and reflect red laser.

[0127] FIG15 is a fourth structural schematic diagram of the laser light source device provided in an embodiment of the present application; FIG16 is a schematic diagram of the optical path principle of the prism provided in an embodiment of the present application.

[0128] In order to overcome the problem of asymmetric distribution of the blue laser spot and the green laser spot in the combined light spot, resulting in poor uniformity of the combined light spot, as shown in FIG15 , the laser light source device is further provided with: a first prism 12p1 and a second prism 12p2. The first prism 12p1 can be located only on the light-emitting side of the second laser chip row l2 of the second laser 112, or can be set on the light-emitting side of the second laser 112; the second prism 12p2 can be located only on the light-emitting side of the second laser chip row l2 of the first laser 111, or can be set on the light-emitting side of the first laser 111.

[0129] When the second laser chip row is composed of a blue laser chip and a green laser chip, and the first prism 12p1 and the second prism 12p2 are only arranged on the light-emitting side of the second laser chip row, the first prism 12p1 and the second prism 12p2 can transfer part of the blue laser to the other light-emitting side of the green laser, so that the emitted blue light spots and green light spots are evenly distributed.

[0130] As shown in FIG16 , the first prism 12p1 and the second prism 12p2 include a first surface s1 and a second surface s2 that are parallel and face the second laser chip row, and also include a third surface s3 and a fourth surface s4 located on either side of the first surface s1 and the second surface s2. As shown in FIG16 , the first surface s1 and the second surface s2 are perpendicular to the incident laser light, while the third surface s3 and the fourth surface s4 are tilted relative to the incident laser light. The green laser light g emitted by the green laser chip (second laser chip x2) and the blue laser light b emitted by the blue laser chip (second laser chip x3) can be incident directly on the first surface s1, without changing direction within the incident prism. A beam of blue laser light b and a beam of green laser light g are emitted directly from the second surface s2. The blue laser light b emitted by the blue laser chip located at the edge (the second laser chip x3) is incident on the first surface s1 and then on the third surface s3 inside the prism. Since the third surface s3 is tilted, the blue laser light is reflected by the third surface s3 and propagates inside the prism to be incident on the fourth surface s4. After being reflected by the fourth surface s4, it is emitted from the second surface s2. In this way, the blue laser light b emitted by the blue laser chip located at the edge can be transferred to the other side of the green laser chip for emission, so that the output light spots are as shown in Figure 17. The blue light spots B are located on both sides of the green light spot G, so that the color distribution of the output light spots is symmetrical.

[0131] By placing prisms on the light-emitting side of the second laser chip row l2, the blue light spot can be positioned on either side of the green light spot, increasing the spatial overlap of the blue and green light spots and weakening the light spot boundary. For the three-color combined light spot, the overlap of the red, green, and blue light spots is also increased, reducing the local color cast of the light spots, thereby improving the color distribution uniformity and symmetry of the combined light spot.

[0132] FIG18 is a fifth structural schematic diagram of the laser light source device provided in an embodiment of the present application; FIG19 is a side structural schematic diagram of the laser light source device shown in FIG18 .

[0133] In some embodiments, as shown in Figures 18 and 19 , the first laser 111 and the second laser 112 are arranged side by side and have the same light emission direction. The light combining assembly includes a reflector 12f and a light combining assembly 12h. The reflector 12f is located on the light emission side of the second laser 112, and the light combining assembly 12h is located on the light emission side of the first laser 111. The reflector 12f and the light combining assembly 12h are arranged parallel to each other.

[0134] As shown in FIG19 , the light combining component 12h is divided into a first portion 12h1 and a second portion 12h2 . The first portion 12h1 of the light combining component corresponds to the first light emitting area of ​​the first laser 111 , and the second portion 12h2 of the light combining component corresponds to the second light emitting area of ​​the first laser 111 .

[0135] As shown in Figure 18, the reflective element 12f receives the laser emitted from the second light emitting area of ​​the second laser 112 and reflects it toward the first part 12h1 of the light combining element, and receives the laser emitted from the first light emitting area of ​​the second laser 112 and reflects it toward the second part 12h2 of the light combining element; the first part 12h1 of the light combining element combines the laser emitted from the second light emitting area of ​​the second laser 112 with the laser emitted from the first light emitting area of ​​the first laser 111, and the second part 12h2 of the light combining element combines the laser emitted from the first light emitting area of ​​the second laser 112 with the laser emitted from the second light emitting area of ​​the first laser 111, and finally emits along the first direction x and combines along the slow axis direction of the laser.

[0136] The reflective element 12f can be a reflective film or a reflective mirror, which is used to reflect light of the entire wavelength band. The reflective element 12f can also be set separately corresponding to the first light emitting area and the second light emitting area of ​​the second laser. The light combining element 12h can be a dichroic film or a dichroic mirror, and the use of a partitioned coating method can reduce the number of components used. Of course, the first and second parts of the light combining element can also be set into two light combining elements corresponding to the first light emitting area and the second light emitting area of ​​the first laser. Among them, the first light emitting area can emit red laser, and the second light emitting area can emit green laser and blue laser. Then the first part 12h1 of the light combining element is used to transmit green laser and blue laser, and reflect red laser; the second part 12h2 of the light combining element is used to transmit red laser and reflect green laser and blue laser.

[0137] FIG20 is a sixth structural schematic diagram of the laser light source device provided in an embodiment of the present application.

[0138] Similarly, in order to overcome the problem of uneven color distribution of the combined light spot, as shown in Figure 20, the laser light source device is also provided with: a first prism 12p1 and a second prism 12p2. The positions, functions and principles of the first prism 12p1 and the second prism 12p2 can be found in the above embodiments and will not be repeated here.

[0139] FIG21 is the seventh structural schematic diagram of the laser light source device provided in an embodiment of the present application.

[0140] In some embodiments, as shown in FIG21 , the first laser 111 and the second laser 112 are arranged vertically, and their light emitting directions are perpendicular to each other. The light combining assembly includes: a reflector 12f and a light combining assembly 12h, wherein the light combining assembly 12h is located at the intersection of the outgoing laser light of the first laser 111 and the outgoing laser light of the second laser 112, and the reflector 12f is located on the side of the light combining assembly 12h away from the first laser 111; the light combining assembly is divided into a first part and a second part, wherein the first part of the light combining assembly corresponds to the first light emitting area of ​​the first laser 111 and the second light emitting area of ​​the second laser 112, and the second part of the light combining assembly corresponds to the second light emitting area of ​​the first laser 111 and the first light emitting area of ​​the second laser 112. The first part of the light combining component is used to receive the laser light emitted from the first light emitting area of ​​the first laser 111 and the laser light emitted from the second light emitting area of ​​the second laser 112, and combine the received laser light and emit it to the reflector 12f; the second part of the light combining component is used to receive the laser light emitted from the second light emitting area of ​​the first laser 111 and the laser light emitted from the first light emitting area of ​​the second laser 112, and combine the received laser light and emit it to the reflector 12f; the reflector 12f is used to receive the combined laser light beam reflected along the first direction x, and combine the light along the slow axis direction of the laser.

[0141] The reflective element 12f can be a reflective film or a reflective mirror, which is used to reflect light of the entire wavelength band. The reflective element 12f can be divided into two corresponding to the first light emitting area and the second light emitting area of ​​the laser. The light combining element 12h can be a dichroic film or a dichroic mirror. The use of a partitioned coating method can reduce the number of components used. Of course, the first part and the second part of the light combining element can also be set to two respectively corresponding to the first light emitting area and the second light emitting area of ​​the laser. Among them, the first light emitting area can emit red laser, and the second light emitting area can emit green laser and blue laser. Then the first part of the light combining element is used to transmit red laser and reflect green laser and blue laser; the second part of the light combining element is used to transmit green laser and blue laser and reflect red laser.

[0142] FIG22 is an eighth structural schematic diagram of the laser light source device provided in an embodiment of the present application.

[0143] Similarly, in order to overcome the problem of uneven color distribution of the combined light spot, as shown in Figure 22, the laser light source device is also provided with: a first prism 12p1 and a second prism 12p2. The positions, functions and principles of the first prism 12p1 and the second prism 12p2 can be found in the above embodiments and will not be repeated here.

[0144] In some embodiments, the first laser 111 and the second laser 112 can also be arranged relative to each other, wherein the setting position of the first laser 111 can be based on Figure 8, and the first laser 111 can be flipped to emit light downward, so that the light emission directions of the first laser 111 and the second laser 112 are opposite. The light combining component can be located between the first laser 111 and the second laser 112. The light combining component can include a reflector and a light combining component, and the light combining component includes a first part and a second part. The reflector can be arranged on the light emitting side of the second laser, and the light combining component can be arranged on the light emitting side of the first laser, and the inclination directions of the reflector and the light combining component are opposite. The reflector reflects the laser light emitted by the second laser toward the light combining component, and the first part of the light combining component can combine the laser light emitted from the second light emitting area of ​​the second laser with the laser light emitted from the first light emitting area of ​​the first laser, and the second part of the light combining component can combine the laser light emitted from the first light emitting area of ​​the second laser with the laser light emitted from the second light emitting area of ​​the first laser, and emit them along the first direction.

[0145] Similarly, prisms can be provided in the second light emitting areas of the first laser and the second laser to change the laser emission positions, thereby achieving a symmetrical color effect of the laser spots.

[0146] In an embodiment of the present application, depending on the specific application scenario, the first laser and the second laser can be arranged side by side, vertically, or relative to each other and with staggered light-emitting areas. The light-combining component needs to use different specific components to combine the lasers according to the setting direction of the lasers. The embodiment of the present application does not limit the setting method of the lasers, the specific structure of the light-combining component, and the final light-emitting direction.

[0147] It should be noted that the above embodiments are all described using the laser light source device using the laser shown in Figure 6 as an example. In specific implementation, the above light-combining optical path is also applicable to the laser shown in Figure 7. The difference is that since the laser shown in Figure 7 does not require adjustment of the positions of the lasers emitted by the second laser chip and the third laser chip, a transparent plate and prism are not required.

[0148] Figure 23 is a ninth structural schematic diagram of the laser light source device provided in an embodiment of the present application; Figure 24 is a side structural schematic diagram of the laser light source device shown in Figure 23.

[0149] In some embodiments, as shown in Figures 23 and 24, the laser light source device further includes a third laser 113. Since the overall luminous flux and color ratio of the laser light source device are limited by the color ratio of the laser, in practical applications, lasers of a single color can be added to increase the overall luminous flux or improve the brightness and proportion of a certain color. Therefore, the third laser 113 can be a monochromatic laser. If the first laser and the second laser can emit red laser, green laser, and blue laser, then the third laser 113 can emit at least one of the red laser, green laser, and blue laser as needed.

[0150] In order to combine the monochromatic laser light emitted by the third laser 113 with the laser light emitted by the first laser 111 and the second laser 112, the laser light source device also includes a reflector 12fs located on the light-emitting side of the third laser 113. The reflector 12fs is used to receive the laser light emitted by the third laser 113 and reflect it along the same emission direction as the laser light beam after the first laser and the second laser are combined.

[0151] In some embodiments, as shown in FIG23 , the first laser 111 and the second laser 112 are arranged side by side and have the same light emission direction. The third laser 113 can be arranged adjacent to the second laser 112, and the third laser 113 and the second laser 112 are arranged side by side, and the light emission direction of the third laser 113 is the same as that of the first laser 111 and the second laser 112.

[0152] As shown in Figure 24, taking the first laser 111 and the second laser 112 using the combined light path shown in Figure 10 as an example, the position of the reflector 12fs can correspond to between the second reflector 121f2 and the fourth reflector 122f2, so that the laser spot emitted by the third laser 113 is located between the combined light spots of the first laser 111 and the second laser 112.

[0153] Figure 25 is the tenth structural schematic diagram of the laser light source device provided in an embodiment of the present application; Figure 26 is a side structural schematic diagram of the laser light source device shown in Figure 25; Figure 27 is a schematic diagram of the combined light spot provided in an embodiment of the present application.

[0154] In some embodiments, as shown in FIG25 , the first laser 111 and the second laser 112 are arranged side by side and have the same light emission direction. The third laser 113 can be arranged opposite to the first laser 111, and the light emission direction of the third laser 113 is opposite to that of the first laser 111.

[0155] Accordingly, as shown in FIG26 , the third laser 113 needs to be staggered with the first laser 111 and the second laser 112, so that the position of the reflector 12fs corresponds to between the second reflector 121f2 and the fourth reflector 122f2, so that the laser spot emitted by the third laser 113 is located between the combined light spot of the first laser 111 and the second laser 112. The combined light spot can be seen in FIG27 .

[0156] As can be seen from Figures 24 and 26, the third laser 113 needs to be set at a position between the first laser 111 and the second laser 112. Accordingly, the orthographic projection of the reflector 12fs on the plane where the first laser 111 and the second laser 112 are located is located between the first light emitting area c1 and the second light emitting area c2 of the laser. In this way, the laser spot emitted by the third laser 113 can be located in the middle of the combined light spot without increasing the size of the combined light spot.

[0157] Figure 28 is the eleventh structural schematic diagram of the laser light source device provided in an embodiment of the present application; Figure 29 is the twelfth structural schematic diagram of the laser light source device provided in an embodiment of the present application.

[0158] In some embodiments, as shown in Figures 28 and 29, the laser light source device may include four lasers, and the four lasers may be lasers of the same type. Taking the first laser 111 and the second laser 112 using the optical path structure shown in Figure 10 as an example, the third laser 113 and the fourth laser 114 can be arranged opposite to the first laser 111 and the second laser 112, and the combined optical path used by the third laser 113 and the fourth laser 114 can be the same as the combined optical path of the first laser 111 and the second laser 112. In this way, the combined optical path of the two lasers can be modularized and the number of modules can be increased as needed.

[0159] As shown in FIG28 , the combined optical path of the third laser 113 and the fourth laser 114 can be arranged symmetrically with the combined optical path of the first laser 111 and the second laser 112. Alternatively, as shown in FIG29 , the third laser 113 and the fourth laser 114 can be arranged offset relative to the first laser 111 and the second laser 112, thereby making the combined optical path of the third laser 114 and the fourth laser 114 intersect with the combined optical path of the first laser 112 and the second laser 112, thereby avoiding mutual interference in the position of the combined optical paths and reducing the volume of the laser light source device.

[0160] The embodiment of the present application only takes the light-combining optical path shown in Figure 10 as an example, and adds one or two lasers on the basis of it to illustrate the deformation structure of the laser light source device. In specific implementation, lasers and their light-combining optical paths can also be added on the basis of the light-combining optical paths of Figures 13, 15, 18, 20, 21, and 22. As long as the principles of no positional interference between the light-combining elements and the size of the light-combining spot is as small as possible are met, the corresponding deformation structures of the laser light sources are no longer listed one by one here, and the structures of the relevant laser light sources all fall within the protection scope of this application.

[0161] Based on the same inventive concept, the present invention also provides a projection system. Figure 30 is a schematic diagram of the structure of the projection system provided by the present invention. As shown in Figure 30, the projection system includes: a laser light source device 1, an illumination system 2, and a projection lens 3.

[0162] The laser light source device 1 can be any of the aforementioned laser light source devices. The illumination system 2 is located on the light-emitting side of the laser light source device 1 and is used to shape and homogenize the laser beam emitted by the laser light source device 1. As shown in Figure 30, the illumination system 2 includes a light homogenization element 21, a shaping lens 22, and an optical modulator 23.

[0163] The light homogenizing element 21 can be a light pipe as shown in Figure 30, or a light homogenizing element such as a fly-eye lens. When a fly-eye lens is used as the light homogenizing element 21, the laser light source device can achieve a good homogenization effect without requiring the symmetry of the light spot. The shaping lens 22 adjusts the shape and size of the laser spot incident on the light modulator 23, ensuring that the laser beam enters the light modulator 23 at a suitable angle.

[0164] The light modulator 23 is used to modulate incident light to form an image. In a specific implementation, the light modulator 23 can be a transmissive or reflective light modulator. The light modulator 30 shown in Figure 30 is a reflective light modulator. The light modulator 30 receives light reflected by the beam splitter prism P, modulates the incident light, and then reflects the modulated light. Because the light path is folded back through the reflective light modulator, the size of the projection system can be reduced.

[0165] In the embodiment of the present application, the light modulator 23 may be a liquid crystal on silicon (LCoS) or a digital micromirror (DMD).

[0166] LCoS is a semiconductor technology that combines a complementary metal oxide semiconductor (CMOS) substrate with a glass substrate containing transparent electrodes, then injects liquid crystal into the package. LCoS features a high aperture ratio and high resolution for each pixel, enabling the production of high-resolution images.

[0167] The DMD includes many tiny reflective mirrors, each of which can be driven individually to deflect. By controlling the deflection angle of the DMD, the brightness of the light incident on the projection lens 3 is controlled.

[0168] The dichroic prism P is used to separate the illumination beam and the imaging beam. The laser beam emitted by the laser light source device 1 is finally reflected toward the light modulator 23 by the dichroic prism P after undergoing processes such as shaping and homogenization. The light emitted after being modulated by the light modulator 23 will pass through the dichroic prism P and be incident on the projection lens 3.

[0169] After the light modulator 23 modulates the incident light to form an image, the light is reflected toward the projection lens 3 , which forms an image, thereby projecting the image to a suitable size for viewing.

[0170] In some embodiments, as shown in FIG31 , in order to ensure the display brightness of the projected image, based on the limitations of the laser design, the current three-primary color ratio mainly depends on the laser chip, so it is necessary to add a laser of a certain color, and it is necessary to add a monochromatic laser. The laser light source device may include: a three-color laser, a monochromatic laser, a light combining component, and a light homogenizing element. In order to ensure the uniform distribution of the light spots of the three-color laser and the monochromatic laser, a prism is used, and the light is combined through a reflective sheet. In order to ensure the required light spot homogenization, a group of lenses 13 is added after the diffuser 14. For example, a group of beam reduction lenses or beam expansion lenses is added. The incident light spot is uniformly distributed through this group of lenses. The light homogenizing element can homogenize the laser from the light combining component and guide it to the lighting system. Since the reflective sheet 150 is used for light combination, and the lens 13 is added to ensure the uniformity of the light spot, the volume of the laser light source is increased, and the user experience is poor.

[0171] To overcome the above-mentioned problems, the present application provides a laser light source device, which uses a polarization adjustment element to change the polarization direction of the first laser beam in the second laser with the same wavelength and the same polarization direction and the second laser beam in the second laser, so that the first laser beam and the second laser beam are laser beams with the same wavelength and different polarization directions. The first laser beam and the second laser beam with different polarization directions are then combined through a polarization combiner, and the combined laser beam is directed to a light homogenizing element. When the polarization directions of the laser beams are different, the speckle problem of the laser can be reduced; and the addition of a second laser can increase a certain color in the entire laser light source device, thereby increasing the brightness of the laser light source device. At the same time, such a design can reduce the number of lenses, thereby reducing the manufacturing cost of the laser light source device and correspondingly reducing the volume of the laser light source device.

[0172] Figures 32 to 36 are structural schematic diagrams of the laser light source device provided in an embodiment of the present application, Figure 37 is a light spot diagram before the first laser provided in an embodiment of the present application is combined, and Figure 38 is a light spot diagram after the first laser and the second laser provided in an embodiment of the present application are combined.

[0173] As shown in FIG. 32 to FIG. 38 , the laser light source device system 100 provided in an embodiment of the present application includes:

[0174] A first laser 110 and a second laser 120 , wherein the first laser 110 is configured to emit at least two laser beams of different wavelengths, and the different laser beams emitted by the first laser 110 have different polarization directions. The laser beams emitted by the first laser 110 include a first laser beam 111 having a first wavelength.

[0175] It should be noted that the first laser 110 is a three-color laser, wherein the first laser 110 can emit red laser, blue laser and green laser.

[0176] In addition, it should be noted that the polarization direction and wavelength of the red laser light are different from those of the blue laser light and the green laser light.

[0177] The second laser 120 is configured to emit a second laser beam 121 having a first wavelength. The polarization direction of the second laser beam 121 is the same as that of the first laser beam 111 .

[0178] It should be noted that the second laser 120 is a monochromatic laser, which uses a single blue laser beam to excite yellow phosphor and green phosphor on the phosphor color wheel, thereby generating red, green and blue laser beams.

[0179] Correspondingly, first laser 110, i.e., a three-color laser, utilizes red, green, and blue lasers to emit red, green, and blue laser beams, respectively. Because the laser beam emitted by any of the three-color lasers is highly monochromatic, selecting a laser with the appropriate wavelength ensures that the emitted red, green, and blue laser beams are virtually free of stray light. Therefore, compared to monochromatic lasers, three-color lasers offer the advantages of a wider color gamut and higher brightness, making them increasingly popular in laser projection equipment.

[0180] In addition, it should be noted that the first laser beam 111 and the second laser beam 121 can both be any one of red laser, blue laser and green laser. Specifically, they can be adjusted according to actual conditions and are not subject to excessive restrictions here.

[0181] In the embodiment of the present application, the second laser beam 121 comes from a monochromatic laser, and its main function is to supplement a certain laser color for the laser light source device 100, thereby increasing the brightness. Therefore, the first laser beam 111 and the second laser beam 121 can both be red lasers, or blue lasers, or green lasers.

[0182] Of course, for the convenience of explanation, in the embodiment of the present application, the second laser beam 121 is red as an example for explanation.

[0183] The polarization light combining component 130 includes a polarization adjustment element 131 and a polarization light combining element 132. The polarization adjustment element 131 is arranged on the light output side of one of the first laser 110 and the second laser 120 to change the polarization direction of one of the first laser beam 111 and the second laser beam 121. The polarization light combining element 132 is located on the light output path of the first laser 110 and the second laser 120. The polarization light combining element 132 is constructed to reflect one of the laser beam of the first laser 110 and the laser beam of the second laser 120, and transmit the laser beam of the other.

[0184] As shown in Figure 32, the polarization adjustment element 131 is arranged on the light-emitting side of the first laser 110 to change the polarization direction of the first laser beam 111. The polarization light combining element 132 is located on the light-emitting path of the first laser 110 and the second laser 120. The polarization light combining element 132 is constructed to reflect the laser beam of the first laser 110 and transmit the laser beam of the second laser 120.

[0185] As shown in Figure 33, the polarization adjustment element 131 is arranged on the light-emitting side of the second laser 120 to change the polarization direction of the second laser beam 121. The polarization combining element 132 is located on the light-emitting path of the first laser 110 and the second laser 120. The polarization combining element 132 is constructed to reflect the laser beam of the first laser 110 and transmit the laser beam of the second laser 120.

[0186] It should be noted that the polarization adjustment element 131 is used to change the polarization direction of one of the first laser beam 111 and the second laser beam 121 so that the two can be polarized and combined. Specifically, regarding the setting position of the polarization adjustment element 131, the embodiment of the present application does not impose too many restrictions here.

[0187] In addition, considering the convenience of processing or installation, as shown in FIG34 , the polarization adjustment element 131 can be divided into two, which are respectively located at the light-emitting sides of the two second laser beams 121 of the second laser 120 .

[0188] It should be noted that since the polarization modes of the red lasers emitted by the first laser beam 111 and the second laser beam 121 are the same, the laser beams emitted by the first laser beam 111 and the second laser beam 120 will interfere with each other in the subsequent optical path, causing the laser beams to easily produce speckles in the subsequent optical path, thereby resulting in poor display effect of the projection image projected by the laser projection device.

[0189] Therefore, in order to achieve different polarization directions for the first laser beam 111 and the second laser beam 121 when projected onto the polarization light combining element 132, in some embodiments, the polarization light combining assembly 130 may further include a polarization adjustment element 131, which is located on the light incident side of the polarization light combining element 132. The polarization adjustment element 131 is used to adjust the polarization direction of the first laser beam 111 or the second laser beam 121.

[0190] Furthermore, it should be noted that the laser light source device 100 provided in the embodiment of the present application controls the polarization direction of the first laser beam 111 of the first laser 110 so that the polarization direction of the first laser beam 111 of the first laser 110 and the polarization direction of the second laser beam 121 of the second laser 120 are changed from the same to two different polarization directions, so that the polarization light combining element 132 combines the laser beams of different polarization directions and directs the combined laser beams to the light homogenizing assembly 140. When the polarization directions of the laser beams are different, the speckle problem of the laser can be reduced.

[0191] In addition, the wavelengths of the first laser beam 111 and the second laser beam 121 are the same, both being the first wavelength. Thus, when laser beams of the same wavelength but different polarization directions are projected onto the polarization combining element 132, the speckle problem of the laser beams emitted by the polarization combining element 132 is relatively small.

[0192] The light homogenizing component 140 is used to homogenize the laser beam emitted by the polarization light combining element 132 .

[0193] It should be noted that the light is combined by the polarization light combining element 132 and the light spot is adjusted by the light homogenizing component 140, which has a simple and compact structure and a good light homogenizing effect.

[0194] The polarization direction of the first laser beam 111 and the second laser beam 121 in the second laser 120, which have the same wavelength and polarization direction, are changed by the polarization adjustment element 131, so that the first laser beam 111 and the second laser beam 121 have the same wavelength but different polarization directions. The first laser beam 111 and the second laser beam 121 with different polarization directions are then combined by a polarization combiner, and the combined laser beams are directed to the light homogenization component 140. When the polarization directions of the laser beams are different, the laser speckle problem can be reduced. The addition of the second laser 120 can also increase the color of the entire laser light source device 100, thereby increasing the brightness of the laser light source device 100. At the same time, this design can reduce the number of lenses, thereby reducing the manufacturing cost of the laser light source device 100 and correspondingly reducing the volume of the laser light source device 100.

[0195] In some embodiments, as shown in FIG. 32 to FIG. 38 , the laser beam emitted by the first laser 110 further includes a third laser beam 112 having a second wavelength. The polarization direction of the third laser beam 112 is different from that of the first laser beam 111 .

[0196] It should be noted that the second laser 120 is a monochromatic laser. For ease of understanding, the second laser 120 can also emit a laser beam including a fourth laser beam having a second wavelength. The polarization direction of the third laser beam 112 is the same as the polarization direction of the fourth laser beam; the polarization direction of the fourth laser beam is different from the polarization direction of the second laser beam 121.

[0197] The second laser 120 may emit a second laser beam 121 or a fourth laser beam, which may be adjusted according to actual conditions.

[0198] It should be noted that the third laser beam 112 can be at least two lines, wherein the third laser beam 112 includes a blue laser beam and a green laser beam; the fourth laser beam can be at least two lines, wherein the fourth laser beam includes a blue laser beam and a green laser beam.

[0199] The polarization directions of the blue laser beam and the green laser beam of the third laser beam 112 are different from the polarization direction of the red laser beam of the first laser beam 111 . Correspondingly, the polarization directions of the blue laser beam and the green laser beam of the fourth laser beam are different from the polarization direction of the red laser beam of the second laser beam 121 .

[0200] In some embodiments, the polarization adjusting element 131 is disposed on an outgoing optical path of the first laser beam 111 in the first laser 110 . The polarization adjusting element 131 is used to change the polarization direction of the first laser beam 111 .

[0201] Specifically, the polarization adjustment element 131 is located in the outgoing optical path of the first laser beam 111 of the first laser 110. Accordingly, the polarization adjustment element 131 is used to adjust the polarization direction of the red laser beam in the first laser beam 111 from the same polarization direction as the polarization direction of the red laser beam in the second laser beam 121 to a polarization direction different from the polarization direction of the red laser beam in the second laser beam 121.

[0202] In some embodiments, the first laser beam 111 has a first polarization direction, and the third laser beam 112 has a second polarization direction; the polarization adjustment element 131 is used to adjust the first laser beam 111 with the first polarization direction into the first laser beam 111 with the second polarization direction; the polarization adjustment element 131 is disposed on an outgoing optical path of a portion of the third laser beam 112 in the first laser 110, and the polarization adjustment element 131 is used to adjust the portion of the third laser beam 112 with the second polarization direction into the third laser beam 112 with the first polarization direction.

[0203] It should be noted that the first polarization direction is the P polarization direction, and the second polarization direction is the S polarization direction.

[0204] Correspondingly, the polarization direction of the first laser beam 111 of the first laser 110 is the P polarization direction, and the polarization direction of the third laser beam 112 of the first laser 110 is the S polarization direction; the polarization direction of the second laser beam 121 of the second laser 120 is the P polarization direction, and the polarization direction of the fourth laser beam of the second laser 120 is the S polarization direction.

[0205] It should be noted that the blue laser beam and the green laser beam in the third laser beam 112 are combined with the red laser beam in the first laser beam 111 and the second laser beam 121 by wavelength combination.

[0206] Of course, the blue laser beam and the green laser beam in the third laser beam 112 may also be combined by polarization combining. The embodiment of the present application does not impose too many restrictions on this and can be adjusted according to actual conditions.

[0207] In this scenario, the first laser beam 111 and the second laser beam 121 are both red laser beams, and the polarization directions of the red laser beams in the first laser beam 111 and the second laser beam 121 in the current laser light source device 100 are both P polarization directions, and the polarization directions of the blue laser beam and the green laser beam in the third laser beam 112 and the fourth laser beam are both S polarization directions.

[0208] It's important to note that for ease of understanding, the terms p-polarization and s-polarization are explained here. When light strikes the surface of an optical component at non-perpendicular angles, both reflection and transmission characteristics become polarization-dependent. In this case, the coordinate system used is defined by the plane containing the input and reflected beams. If the polarization vector of the light lies within this plane, it is called p-polarization; if the polarization vector is perpendicular to the plane, it is called s-polarization.

[0209] In some embodiments, when the first laser beam 111 of the first laser 110 and the second laser beam 121 of the second laser 120 need to be combined, it means that the laser light source device 100 needs to add the second laser beam 121 to increase brightness.

[0210] Specifically, the polarization direction of the red laser beam in the first laser beam 111 can be adjusted from the P polarization direction to the S polarization direction, so that the polarization direction of the red laser beam projected by the first laser beam 111 onto the polarization light combining element 132 is the S polarization direction, while the polarization direction of the red laser beam projected by the second laser beam 121 onto the polarization light combining element 132 is still the P polarization direction, thereby achieving different polarization directions of the red laser beams when the first laser 110 and the second laser 120 are projected onto the polarization light combining element 132.

[0211] In some embodiments, when the third laser beam 112 of the first laser 110 and the fourth laser beam of the second laser 120 need to be combined, it means that the laser light source device 100 needs to add a fourth laser beam to increase brightness.

[0212] Specifically, the polarization directions of the blue laser beam and the green laser beam in the third laser beam 112 can be adjusted from the S polarization direction to the P polarization direction, so that the polarization directions of the blue laser beam and the green laser beam projected by the third laser beam 112 onto the polarization light combining element 132 are P polarization directions, while the polarization directions of the blue laser beam and the green laser beam projected by the second laser beam 121 onto the polarization light combining element 132 are still S polarization directions, thereby achieving different polarization directions of the blue laser beam and the green laser beam when the first laser 110 and the second laser 120 are projected onto the polarization light combining element 132.

[0213] In some embodiments, the polarization adjustment element 131 is a half-wave plate. For example, the polarization adjustment element 131 includes a half-wave plate. A half-wave plate can rotate polarized light. Because linearly polarized light is incident perpendicularly on the half-wave plate, the transmitted light remains linearly polarized. If the angle between the vibration plane and the main cross section of the crystal at the time of incidence is θ, the vibration plane of the transmitted linearly polarized light is rotated by an angle of 2θ from its original orientation.

[0214] It should be noted that the polarization adjustment element 131 may be a quarter wave plate.

[0215] As shown in FIG. 32 to FIG. 38 , there are two first lasers 110 , which are spaced apart along a first direction, and the second laser 120 is located between the two first lasers 110 , wherein the first direction is the light emitting direction of the first laser 110 .

[0216] It should be noted that in order to improve the color gamut of the laser light source device 100, there are two first lasers 110, which means that the laser light source device 100 has two three-color lasers, among which the monochromatic laser, that is, the second laser 120 is located between the two first lasers 110.

[0217] As shown in FIG36 , the second laser beam 121 in the second laser 120 is divided into at least two parts. Part of the polarization adjustment element 131 is located on the light-emitting side of the part of the second laser beam 121 in the second laser 120, so that the second laser beam 121 in the part of the second laser 120 is combined with the first laser beam 111 of one of the two first lasers 110 without the polarization adjustment element 131; the other part of the polarization adjustment element 131 is located on the light-emitting side of the first laser beam 111 of one of the two first lasers 110, so that the second laser beam 121 in the second laser 120 without the polarization adjustment element 131 is combined with the first laser beam 111 of one of the two first lasers 110 with the polarization adjustment element 131.

[0218] In some embodiments, the laser light source device 100 needs to supplement the second laser beam 121 to increase brightness. Specifically, the second laser beam 121 of a portion of the second laser 120 is combined with the first laser beam 111 of one of the two first lasers 110, and the second laser beam 121 of another portion of the second laser 120 is combined with the first laser beam 111 of the other of the two first lasers 110.

[0219] In some embodiments, the laser light source device 100 may need to add a fourth laser beam to increase brightness. Specifically, a portion of the fourth laser beam from the second laser 120 is combined with the third laser beam 112 from one of the two first lasers 110, and another portion of the fourth laser beam from the second laser 120 is combined with the third laser beam 112 from the other of the two first lasers 110.

[0220] It should be noted that when the third laser beams 112 in the two first lasers 110 are combined, the polarization adjustment element 131 is required to adjust the polarization direction of the third laser beam 112 in any one of the two first lasers 110, so that the third laser beam 112 in any one of the two first lasers 110 is adjusted from the S polarization direction to the P polarization direction, while the third laser beam 112 in the other first laser 110 is still in the S polarization direction, so that the polarization directions of the blue laser beam and the green laser beam when the other first laser 110 is projected onto the polarization combining element 132 are different, which can improve the speckle effect.

[0221] 39 to 40 are schematic structural diagrams of the laser light source device provided in an embodiment of the present application.

[0222] In some embodiments, as shown in Figures 39 and 40, the second laser 120 can be arranged in parallel with one of the first lasers 110. Specifically, if the second laser 120 in Figure 9 is arranged near the side of the light homogenization component 140, polarization light combining is used for light combining. The specific light combining method may depend on the location of the second laser 120.

[0223] In some embodiments, as shown in FIG. 41 and FIG. 42 , there may be three first lasers 110 .

[0224] In some embodiments, the polarization light combining assembly 130 further includes a prism 133 . The prism 133 is located on the light incident side of the polarization light combining element 132 . The prism 133 is used to adjust a portion of the laser beam.

[0225] It should be noted that the combined light can be adjusted by the prism 133 to make the light spot more uniform. The prism 133 can adjust the direction and intensity of the light as needed to achieve the desired light spot effect.

[0226] Specifically, after the light combining component guides the laser adjusted by the prism 133 to the light homogenizing component 140, the laser can be better homogenized by the light homogenizing component 140, so that the light homogenizing component 140 has a better homogenizing effect on the laser emitted by the first laser 110 and the second laser 120, thereby ensuring that the display effect of the projection picture projected by the laser projection equipment equipped with this laser light source device 100 is better.

[0227] In some embodiments, as shown in Figures 31 to 42, the light uniforming component 140 includes a diffuser 141, a lens 142, a diffuser wheel 143 and a light pipe 144; the diffuser 141 is located on the light output side of the polarization light combining element 132, and the lens 142 is located between the diffuser 141 and the diffuser wheel 143; the polarization light combining element 132 is used to reflect the laser beam toward the diffuser 141, the diffuser 141 is used to uniformly project the received laser beam to the lens 142, the lens 142 is used to converge the received laser beam to the diffuser wheel 143, and the diffuser wheel 143 is used to uniformly project the received beam to the light pipe 144.

[0228] The polarization light combining element 132 is used to project a laser beam to the diffuser 141 . The diffuser 141 is used to evenly project the received laser beam to the lens 142 . The lens 142 is used to converge the received laser beam to the diffuser wheel 143 . The diffuser wheel 143 is used to evenly project the received beam to the light pipe 144 .

[0229] The diffuser 141 can initially homogenize the laser beam from the light combining assembly and direct the initially homogenized laser beam to the lens 142. The lens 142 can be located between the diffuser 141 and the diffuser wheel 143. The lens 142 can converge the laser beam initially homogenized by the diffuser 141 and direct the converged laser beam to the diffuser wheel 143 in the light homogenizing assembly 140. The diffuser wheel 143 further homogenizes the received beam and projects the homogenized laser beam to the light guide 144. The laser beam further homogenized by the light guide 144 is finally homogenized, achieving a better homogenization effect on the laser beam.

[0230] Specifically, the laser beam emitted from the polarization light combining element 132 may be directed toward the diffuser 141 , which may homogenize the incident laser beam and then direct it toward the lens 142 . The lens 142 is configured to converge the laser beam emitted from the diffuser 141 onto the light incident surface of the light pipe 144 .

[0231] The diffusion wheel 143 (ie, the rotatable diffusion sheet 141 ) is located between the lens 142 and the light pipe 144 . The diffusion wheel 143 can diffuse the convergent light beam, increase the divergence angle of the light beam, and increase the random phase.

[0232] Thus, due to the presence of diffuser 141 in the front optical path, the laser beam is homogenized, converged by lens 142, and incident on diffuser wheel 143. The laser beam first passes through a stationary diffuser 141 and then through a moving diffuser 141. In this way, the laser beam is further diffused and homogenized based on the homogenization performed by the stationary diffuser 141. This can enhance the homogenization effect of the laser beam, reduce the energy content of the laser beam near the optical axis, and thus reduce the coherence of the laser beam, thereby significantly improving the speckle phenomenon on the projected image.

[0233] Furthermore, the light pipe 144 is a hollow tubular device, and light is reflected multiple times within the light pipe 144, achieving a uniform light effect. Thus, the laser light source device 100 can shape the laser beam after light combination by the polarization light combining element 132 through the lens 142, so that the difference between the width of the spot of the shaped laser beam along the slow axis and the width along the fast axis of the laser beam is small. This results in a higher degree of uniformity in the laser beam after the shaped laser beam passes through the light pipe 144.

[0234] In addition, it should be noted that this solution can also be used in a compound eye lighting system, where the compound eye is used instead of the light pipe 144 to homogenize the light, which is then incident on the lighting system.

[0235] It should be noted that when the light homogenizing component 140 includes a fly-eye lens, the laser beam emitted from the light combining component can be directly directed to the fly-eye lens. The fly-eye lens can homogenize the laser beams emitted by each laser unit.

[0236] The laser light source device provided in an embodiment of the present application includes: a first laser and a second laser, the first laser is used to emit at least two laser beams of different wavelengths, and the different laser beams emitted by the first laser have different polarization directions, and the laser beam emitted by the first laser includes a first laser beam with a first wavelength; the second laser is used to emit a second laser beam with a first wavelength, and the polarization direction of the second laser beam is the same as the polarization direction of the first laser beam; a polarization light combining component, the polarization light combining component includes a polarization adjustment element and a polarization light combining element, the polarization adjustment element is arranged on the light output side of one of the first laser and the second laser to change the polarization direction of one of the first laser beam and the second laser beam, the polarization light combining element is located on the light output path of the first laser and the second laser, and the polarization light combining element is constructed to reflect one of the laser beam of the first laser and the laser beam of the second laser, and transmit the laser beam of the other; a light homogenizing component, the light homogenizing component is used to homogenize the laser beam emitted by the polarization light combining element.

[0237] With the above arrangement, the polarization adjustment element changes the polarization direction of the first laser beam in the second laser, which has the same wavelength and polarization direction, and the second laser beam in the second laser, which has the same wavelength and polarization direction, so that the first laser beam and the second laser beam have the same wavelength but different polarization directions. The first laser beam and the second laser beam with different polarization directions are then combined by a polarization combiner, and the combined laser beam is directed to the light homogenization component. When the polarization directions of the laser beams are different, the laser speckle problem can be reduced. The addition of a second laser can also increase the color of the entire laser light source device, thereby increasing the brightness of the laser light source device. At the same time, this design can reduce the number of lenses, thereby reducing the manufacturing cost of the laser light source device and correspondingly reducing the size of the laser light source device.

[0238] In addition, the embodiment of the present application further provides a laser light source device 100, comprising:

[0239] A light-emitting component includes multiple lasers, which emit laser beams; a polarization light-combining component 130 includes a polarization light-combining element 132 and a polarization adjustment element 131, and the polarization adjustment element 131 is used to adjust the polarization directions of the laser beams of multiple lasers so that the laser beams with the same polarization direction are adjusted into laser beams with different polarization directions. The polarization light-combining element 132 is used to combine the laser beams with different polarization directions; and a light-homogenizing component 140 is used to homogenize the combined laser beams.

[0240] The laser light source device provided in the embodiment of the present application includes: a light-emitting component, the light-emitting component includes multiple lasers, and the multiple lasers emit laser beams; a polarization light combining component, the polarization light combining component includes a polarization light combining element and a polarization adjustment element, the polarization adjustment element is used to adjust the polarization directions of the laser beams of the multiple lasers so that the laser beams with the same polarization direction are adjusted into laser beams with different polarization directions, and the polarization light combining element is used to combine the laser beams with different polarization directions; and a light homogenizing component, the light homogenizing component is used to homogenize the laser beam after the combination.

[0241] The polarization adjustment element changes the polarization direction of the first laser beam in the second laser (which has the same wavelength and polarization direction) and the second laser beam in the second laser (which has the same wavelength and polarization direction), so that the first laser beam and the second laser beam have the same wavelength but different polarization directions. The first and second laser beams, which have different polarization directions, are then combined by a polarization combiner and directed to the light homogenization component. When the polarization directions of the laser beams differ, the laser speckle problem can be reduced. Furthermore, the addition of a second laser can increase the color of the entire laser light source device, thereby increasing the brightness of the laser light source device. This design also reduces the number of lenses, thereby reducing the manufacturing cost of the laser light source device and correspondingly reducing the size of the laser light source device.

[0242] In addition, an embodiment of the present application further provides a projection system, including:

[0243] Laser light source device 100, laser light source device 100 is the above-mentioned laser light source device 100, the laser light source device 100 is used to provide a laser beam to the optical machine lighting system; the lighting system is used to modulate the laser beam provided by the laser light source device 100 into an image beam and then emit it to the projection lens; the projection lens is used to image the image beam and then emit it to the projection screen.

[0244] The specific structure, working principle and function of the laser light source device 100 have been described in detail in the aforementioned embodiment 1 and will not be repeated here.

[0245] Finally, although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the invention.

Claims

1. A laser light source device, comprising: A light emitting assembly includes a first laser and a second laser, each laser includes a plurality of laser chips for emitting three-color lasers; The first laser and the second laser are arranged along a first direction; a plurality of laser chips in each laser are arranged into a first light emitting area and a second light emitting area arranged along a second direction; the wavelengths of lasers emitted by the first light emitting area and the second light emitting area are different; the first light emitting area of ​​the first laser and the second light emitting area of ​​the second laser are arranged adjacent to each other along the first direction, and the centers are aligned along the first direction; the second light emitting area of ​​the first laser and the first light emitting area of ​​the second laser are arranged adjacent to each other along the first direction, and the centers are aligned along the first direction; the first direction and the second direction are perpendicular to each other; A light combining component is located on the light emitting side of the first laser and the second laser, and is used to combine the laser light emitted from the first light emitting area of ​​the first laser with the laser light emitted from the second light emitting area of ​​the second laser, and combine the laser light emitted from the second light emitting area of ​​the first laser with the laser light emitted from the first light emitting area of ​​the second laser, and emit along the first direction, the first direction is parallel to the direction of the slow axis of the laser, the divergence angle of the laser light emitted by the laser chip along the slow axis is smaller than the divergence angle along the fast axis, and the divergence angle of the laser light emitted by the light emitting component along the slow axis is larger than the divergence angle along the fast axis.

2. The laser light source device according to claim 1, wherein: The first laser and the second laser are arranged side by side and have the same light emitting direction; The light combining component comprises: a first component and a second component, wherein the first component is located at the light emitting side of the first light emitting area of ​​the first laser and the second light emitting area of ​​the second laser, and the second component is located at the light emitting side of the second light emitting area of ​​the first laser and the first light emitting area of ​​the second laser; The first component includes: a first reflector, a first light combining element, and a second reflector; the first reflector is used to receive the laser light emitted from the second light emitting area of ​​the second laser and reflect it toward the first light combining element; the first light combining element is used to combine the laser light emitted from the second light emitting area of ​​the second laser and the laser light emitted from the first light emitting area of ​​the first laser and emit them toward the second reflector; the second reflector is used to reflect the received combined laser light beam along the first direction; The second component includes: a third reflector, a second light combining element and a fourth reflector; the third reflector is used to receive the laser emitted from the second light emitting area of ​​the first laser and reflect it to the second light combining element, the second light combining element is used to combine the received laser emitted from the second light emitting area of ​​the first laser with the laser emitted from the first light emitting area of ​​the second laser and emit them to the fourth reflector, and the fourth reflector is used to reflect the received combined laser beam along the first direction.

3. The laser light source device according to claim 2, wherein: The plurality of laser chips include a plurality of first laser chips, a plurality of second laser chips and a plurality of third laser chips; the wavelengths of lasers emitted by the first laser chip, the second laser chip and the third laser chip are different; The plurality of first laser chips are located in the first light emitting area and are arranged into a first laser chip row along the first direction; the plurality of second laser chips and the plurality of third laser chips are located in the second light emitting area and are arranged into a second laser chip row along the first direction; the first laser chip row and the second laser chip row are arranged along the second direction; The first reflector and the third reflector are both transparent plates, and the transparent plates include a first surface and a second surface that are parallel to each other, the first surface is arranged facing the second laser chip row, and the second surface is arranged away from the second laser chip row; A first film layer is disposed on the first surface, and the first film layer is used to transmit the laser light emitted by the third laser chip and reflect the laser light emitted by the second laser chip; a second film layer is disposed on the second surface, and the second film layer is used to reflect incident light; the refractive index and thickness of the transparent plate are such that the laser light emitted by the third laser chip incident on the transparent plate from the first surface is reflected by the second surface and then emitted from the gap between the laser light emitted by the second laser chip reflected from the first surface; The refractive index and thickness of the transparent plate satisfy: Wherein, n represents the refractive index of the transparent plate, d represents the thickness of the transparent plate, and a represents the distance between two adjacent laser beams emitted by the laser.

4. The laser light source device according to claim 1, wherein: The first laser and the second laser are arranged side by side and have the same light emitting direction; The light combining assembly comprises: a reflector and a light combining member; the reflector is divided into an upper part and a lower part, and the light combining member is divided into a first part and a second part; The lower part of the reflective element is used to receive the laser light emitted from the second light emitting area of ​​the second laser and reflect it toward the first part of the light combining element, and receive the laser light emitted from the first light emitting area of ​​the second laser and reflect it toward the second part of the light combining element. The first part of the light combining element is used to combine the laser light emitted from the second light emitting area of ​​the second laser with the laser light emitted from the first light emitting area of ​​the first laser and emit them toward the upper part of the reflective element. The second part of the light combining element is used to combine the laser light emitted from the first light emitting area of ​​the second laser with the laser light emitted from the second light emitting area of ​​the first laser and emit them toward the upper part of the reflective element. The upper part of the reflective element is used to reflect the received combined laser beam along the first direction.

5. The laser light source device according to claim 1, wherein: The first laser and the second laser are arranged side by side and have the same light emitting direction; The light combining assembly comprises: a reflector and a light combining member; the light combining member is divided into a first part and a second part; The reflective element is used to receive the laser light emitted from the second light emitting area of ​​the second laser and reflect it toward the first part of the light combining element, and receive the laser light emitted from the first light emitting area of ​​the second laser and reflect it toward the second part of the light combining element; the first part of the light combining element is used to combine the laser light emitted from the second light emitting area of ​​the second laser with the laser light emitted from the first light emitting area of ​​the first laser, and the second part of the light combining element is used to combine the laser light emitted from the first light emitting area of ​​the second laser with the laser light emitted from the second light emitting area of ​​the first laser, and emit them along the first direction.

6. The laser light source device according to claim 1, wherein: The first laser and the second laser are arranged vertically, and the light emitting directions are perpendicular to each other; The light combining assembly comprises: a reflector and a light combining member; the light combining member is divided into a first part and a second part; The first part of the light combining element is used to receive and combine the laser light emitted from the first light emitting area of ​​the first laser and the laser light emitted from the second light emitting area of ​​the second laser, and emit them to the reflective element; the second part of the light combining element is used to receive and combine the laser light emitted from the second light emitting area of ​​the first laser and the laser light emitted from the first light emitting area of ​​the second laser, and emit them to the reflective element; the reflective element is used to receive the combined laser light beam and reflect it along the first direction.

7. The laser light source device according to claim 2, 4, 5 or 6, wherein: The plurality of laser chips are divided into a plurality of first laser chips, a plurality of second laser chips and a plurality of third laser chips; the wavelengths of lasers emitted by the first laser chip, the second laser chip and the third laser chip are different; The plurality of first laser chips are located in the first light emitting area and are arranged into a first laser chip row along the first direction; the plurality of second laser chips and the plurality of third laser chips are located in the second light emitting area and are arranged into a second laser chip row along the first direction; the first laser chip row and the second laser chip row are arranged along the second direction; The laser light source device further includes: a first prism and a second prism, wherein the first prism is located at a light-emitting side of a second light-emitting region of the second laser, and the second prism is located at a light-emitting side of the second light-emitting region of the first laser; The first prism and the second prism are both used to transmit the laser light emitted by the second laser chip and transmit part of the laser light emitted by the third laser chip, and transfer the other part of the laser light emitted by the third laser chip to the other side of the laser light emitted by the second laser chip and then emit it.

8. The laser light source device according to claim 2, 4, 5 or 6, wherein: The plurality of laser chips are divided into a plurality of first laser chips, a plurality of second laser chips and a plurality of third laser chips; the wavelengths of lasers emitted by the first laser chip, the second laser chip and the third laser chip are different; The multiple first laser chips are located in the first light emitting area and are arranged in two rows along the first direction. The multiple second laser chips and the multiple third laser chips are located in the second light emitting area. The multiple second laser chips are arranged in a row along the first direction, and the multiple third laser chips are arranged in a row along the first direction. Four laser chip rows are arranged along the second direction.

9. The laser light source device according to claim 7, wherein: The first laser chip is a red laser chip, the second laser chip is a green laser chip, and the third laser chip is a blue laser chip; the red laser chip is used to emit red laser, the green laser chip is used to emit green laser, and the blue laser chip is used to emit blue laser.

10. A laser light source device, comprising: A first laser and a second laser, wherein the first laser is used to emit laser beams of at least two different wavelengths, and the different laser beams emitted by the first laser have different polarization directions, and the laser beam emitted by the first laser includes a first laser beam having a first wavelength; The second laser is used to emit a second laser beam having the first wavelength, and the polarization direction of the second laser beam is the same as the polarization direction of the first laser beam; a polarization light combining component, the polarization light combining component comprising a polarization adjustment element and a polarization light combining element, the polarization adjustment element being disposed on a light emitting side of one of the first laser and the second laser to change a polarization direction of one of the first laser beam and the second laser beam, the polarization light combining element being located on a light emitting path of the first laser and the second laser, and being configured to reflect one of the laser beam of the first laser and the laser beam of the second laser and transmit the laser beam of the other; A light homogenizing component is used to homogenize the laser light beam emitted by the polarization light combining element.

11. The laser light source device according to claim 10, wherein: The laser beam emitted by the first laser includes a third laser beam having a second wavelength, and a polarization direction of the third laser beam is different from a polarization direction of the first laser beam.

12. The laser light source device according to claim 11, wherein: The polarization adjustment element is disposed on an outgoing optical path of the first laser beam in the first laser, and the polarization adjustment element is used to change a polarization direction of the first laser beam.

13. The laser light source device according to claim 12, wherein: The first laser beam has a first polarization direction, and the third laser beam has a second polarization direction; The polarization adjusting element is used to adjust the first laser beam having a first polarization direction into the first laser beam having a second polarization direction; The polarization adjustment element is disposed on an outgoing optical path of a portion of the third laser beam in the first laser, and is used to adjust a portion of the third laser beam having a second polarization direction into the third laser beam having a first polarization direction.

14. The laser light source device according to any one of claims 10 to 13, wherein: The polarization adjustment element is a half-wave plate.

15. The laser light source device according to any one of claims 10 to 13, wherein: There are two first lasers, the two first lasers are arranged at intervals along a first direction, and the second laser is located between the two first lasers, wherein the first direction is the light emitting direction of the first lasers.

16. The laser light source device according to any one of claims 10 to 13, wherein: The polarization light combining component further includes a prism, which is located at the light incident side of the polarization light combining element and is used to adjust part of the laser light beam.

17. The laser light source device according to any one of claims 10 to 13, wherein: The light homogenization assembly includes a diffuser, a lens and a diffuser wheel; The diffuser is located at the light-emitting side of the polarized light combining element, and the lens is located between the diffuser and the diffuser wheel; The polarized light combining element is used to reflect the laser beam to the diffuser, the diffuser is used to evenly project the received laser beam to the lens, and the lens is used to converge the received laser beam to the diffuser wheel.

18. A laser light source device, characterized in that: include: A light emitting assembly, wherein the light emitting assembly comprises a plurality of lasers, and the plurality of lasers emit laser beams; A polarization light combining component, the polarization light combining component comprising a polarization light combining element and a polarization adjusting element, the polarization adjusting element being used to adjust the polarization directions of the laser beams of the plurality of laser parts so as to adjust the laser beams with the same polarization direction into laser beams with different polarization directions, and the polarization light combining element being used to combine the laser beams with different polarization directions; A light homogenizing component is used to homogenize the laser beam after the combined light.

19. A projection system comprising: The laser light source device according to any one of claims 1 to 9, or the laser light source device according to any one of claims 10 to 17, or the laser light source device according to claim 18, an illumination system and a projection lens; The lighting system comprises: a light homogenizing element, a shaping lens and a light modulator located on the light output side of the laser light source device; The projection lens is located at the light output side of the light modulator.

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