Light source assembly and projection device

Abstract

The present application discloses a light source assembly and a projection device, belonging to the field of optoelectronic technology. The light source assembly includes: a laser, wherein a first laser is emitted from a first light-emitting region, and a second laser with a divergence angle smaller than that of the first laser is emitted from a second light-emitting region; a first light combining lens group that reflects the first laser to the light exit of the light source assembly; a second light combining lens group including m light combining lenses arranged in sequence along the light exit direction of the second light-emitting region, with a gap between the i-th light combining lens and the (i + 1)-th light combining lens among the m light combining lenses, m ≥ 2, 1 ≤ i ≤ m - 1; wherein, the i-th light combining lens includes a reflection region and a transmission region, the reflection region reflects the incident second laser to the light exit, and the transmission region transmits the incident second laser to the (i + 1)-th light combining lens; the m-th light combining lens reflects the incident second laser to the light exit. The present application solves the problem of low uniformity of the laser emitted by the light source assembly. The present application is used for emitting laser light.

Description

Technical Field

[0001] The present application relates to the field of optoelectronic technologies, and particularly to a light source assembly and a projection device. Background Art

[0002] With the development of optoelectronic technologies, the requirements for the display effect of the projection screen of projection devices are getting higher and higher. A projection device includes a light source assembly, which is used to provide the light required to form a projection screen, and the projection screen formed by light with higher uniformity has a better display effect.

[0003] Figure 1 is a schematic structural diagram of a light source assembly provided by the related art. As Figure 1 shown, in the related art, the light source assembly 00 includes: a laser 001, a plurality of light combining lenses (such as a first light combining lens J1, a second light combining lens J2, and a third light combining lens J3), and a converging lens 003. The converging lens 003 is located at the light exit of the light source assembly 00. Different light emitting regions of the laser 001 can emit lasers of different colors. For example, each light emitting region of the laser 001 can emit red laser, green laser, and blue laser respectively. Each light combining lens can be located on the light exit side of a light emitting region of the laser 001 to reflect the laser emitted from this light emitting region to the light exit of the light source assembly, thereby realizing the mixed emission of lasers of different colors emitted by the laser 001.

[0004] Since the divergence angle of the red laser emitted by the laser is greater than the divergence angles of the green laser and the blue laser, the spot size formed by the red laser at the light exit is larger than the spot sizes formed by the green laser and the blue laser at this light exit. The edge of the beam obtained by mixing the red laser, the green laser, and the blue laser at the light exit is reddish. Therefore, the uniformity of the light emitted by the light source assembly of the projection device is poor, resulting in a poor display effect of the projection screen formed by using this light. Summary of the Invention

[0005] The present application provides a light source assembly and a projection device, which can solve the problem that the uniformity of the light emitted by the light source assembly is poor, resulting in a poor display effect of the projection screen formed by using this light. The technical solutions are as follows:

[0006] On the one hand, a light source assembly is provided. The light source assembly includes:

[0007] A laser, having a first light emitting region and a second light emitting region; the first light emitting region is used to emit a first laser, the second light emitting region is used to emit a second laser, and the divergence angle of the first laser is greater than the divergence angle of the second laser;

[0008] The first light combining lens group is located on the light emitting side of the first light emitting region and is configured to reflect the first laser emitted from the first light emitting region to the light emitting port of the light source assembly;

[0009] The second light combining lens group is located on the light emitting side of the second light emitting region; the second light combining lens group includes m light combining lenses arranged in sequence along the light emitting direction of the second light emitting region. There is a gap between the i-th light combining lens and the (i + 1)-th light combining lens among the m light combining lenses, where m ≥ 2 and 1 ≤ i ≤ m - 1; wherein, the i-th light combining lens includes a reflection region and a transmission region. The reflection region is configured to reflect the incident second laser to the light emitting port, and the transmission region is configured to transmit the incident second laser to the (i + 1)-th light combining lens; the m-th light combining lens is configured to reflect the incident second laser to the light emitting port.

[0010] On the other hand, a projection device is provided, and the projection device includes: the above-mentioned light source assembly, an optical engine, and a lens;

[0011] The light source assembly is configured to emit light to the optical engine, the optical engine is configured to converge the light emitted by the light source assembly to the lens, and the lens is configured to project the light converged by the optical engine.

[0012] The beneficial effects brought by the technical solution provided in this application at least include:

[0013] In the light source assembly provided in this application, the second light combining lens group is located on the light emitting side of the second light emitting region of the laser, and the multiple light combining lenses in the second light combining lens group are arranged along the light emitting direction of the second light emitting region and there is a gap between adjacent two light combining lenses. The light combining lenses before the last light combining lens in the second light combining lens group include a transmission region and a reflection region. The second laser incident on the reflection region can be directly reflected by the reflection region to the light emitting port, the second laser incident on the transmission region can pass through the transmission region and shoot to the next light combining lens, and the second laser incident on the last light combining lens can be reflected to the light emitting port. In this way, the second laser emitted from the second light emitting region of the laser can shoot to the light emitting port from multiple light combining lenses with gaps between them. The second laser shooting to the light emitting port can cover a larger range, and the light spot formed by the second laser at the light emitting port can be larger. Even if the divergence angle of the first laser emitted from the first light emitting region is large and the light spot formed by the first laser at the light emitting port is large, in this application, through the multiple light combining lenses in the second light combining lens group, it can also be ensured that the size difference between the light spot formed by the second laser and the light spot formed by the first laser is small, thereby ensuring a high uniformity of the laser obtained by mixing the first laser and the second laser at the light emitting port. Description of the Drawings

[0014] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0015] Figure 1 is a schematic structural diagram of a projection device provided by the related art;

[0016] Figure 2 is a schematic structural diagram of a light source assembly provided by an embodiment of the present application;

[0017] Figure 3 is a schematic structural diagram of a second light combining lens group provided by an embodiment of the present application;

[0018] Figure 4 is a schematic structural diagram of an MCL type laser provided by an embodiment of the present application;

[0019] Figure 5 is a schematic structural diagram of another light source assembly provided by an embodiment of the present application;

[0020] Figure 6 is a schematic structural diagram of another second light combining lens group provided by an embodiment of the present application;

[0021] Figure 7 is a partial schematic structural diagram of a light source assembly provided by an embodiment of the present application;

[0022] Figure 8 is a schematic structural diagram of yet another light source assembly provided by an embodiment of the present application;

[0023] Figure 9 is a schematic structural diagram of a projection device provided by an embodiment of the present application. Detailed implementation manners

[0024] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0025] Figure 1 is a schematic structural diagram of a light source assembly provided by the related art. As Figure 1 shown, the light source assembly 00 includes: a laser 001, a first light combining lens J1, a second light combining lens J2, a third light combining lens J3, and a converging lens 003. The converging lens 003 is located at the light output port of the light source assembly 00. The laser 001 has a target direction (such as Figure 1The light-emitting regions Q3, Q2, and Q1 arranged in sequence in the x direction (in the x direction in []) are perpendicular to the light-emitting direction of the laser 001 (such as Figure 1 the y direction in []). The light-emitting region Q1 can emit red laser light, the light-emitting region Q2 can emit blue laser light, and the light-emitting region Q3 can emit green laser light. The first light-combining lens J1 is located on the light-emitting side of the first light-emitting region Q1, the second light-combining lens J2 is located on the light-emitting side of the light-emitting region Q2, and the third light-combining lens J3 is located on the light-emitting side of the third light-emitting region Q3. The third light-combining lens J3, the second light-combining lens J2, the first light-combining lens J1, and the converging lens 003 are arranged in sequence in the x direction. The red laser light emitted by the light-emitting region Q1 can be directed to the first light-combining lens J1 and, after being reflected on the first light-combining lens J1, is directed to the converging lens 003. The blue laser light emitted by the light-emitting region Q2 can be directed to the second light-combining lens J2 and, after being reflected on the second light-combining lens J2, passes through the first light-combining lens J1 and is directed to the converging lens 003. The green laser light emitted by the light-emitting region Q3 can be directed to the third light-combining lens J3 and, after being reflected on the third light-combining lens J3, passes through the second light-combining lens J2 and the first light-combining lens J1 in sequence and is directed to the converging lens 003. In this way, the green laser light, blue laser light, and red laser light emitted by the laser 001 are mixed and converged on the converging lens 003. Furthermore, the projection screen can be projected according to the mixed laser light.

[0026] However, since the divergence angle of the red laser light emitted by the laser 001 is greater than that of the green laser light and the blue laser light, the spot size of the red laser light formed on the converging lens 003 is larger than the spot sizes of the green laser light and the blue laser light formed on the converging lens 003, and the spot distribution on the converging lens 003 will show a relatively obvious color boundary phenomenon between the inner and outer circles. For example, the spot is circular, the outermost circle is red, and the inner circles are purple, blue, and other concentric circles in sequence. Therefore, the uniformity of the laser light converged by the converging lens 003 is poor, and the display effect of the projection screen formed by projecting according to this laser light is also poor.

[0027] The following embodiments of the present application provide a light source assembly and a projection device. The light source assembly can emit laser light with relatively high uniformity, thereby improving the display effect of the projection screen formed according to this laser light.

[0028] Figure 2 is a schematic structural diagram of a light source assembly provided by an embodiment of the present application. As Figure 2 shown, the light source assembly 10 may include: a laser 101, a first light-combining lens group 102, and a second light-combining lens group (such as the second light-combining lens groups 103a and 103b).

[0029] Among them, the laser 101 has a first light-emitting region Y1 and a second light-emitting region, Figure 2Taking the example that the laser 101 has two second light-emitting regions Y21 and Y22 for illustration. The first light-emitting region Y1 is used to emit the first laser, and the second light-emitting region is used to emit the second laser. The divergence angle of the first laser is greater than that of the second laser.

[0030] The first light-combining lens group 102 is located on the light-emitting side of the first light-emitting region Y1. The first light-combining lens group 102 is used to reflect the first laser emitted from the first light-emitting region Y1 to the light-emitting port K of the light source assembly 00.

[0031] The second light-combining lens group is located on the light-emitting side of the second light-emitting region. For example, the second light-combining lens group 103a is located on the light-emitting side of the corresponding second light-emitting region Y21, and the second light-combining lens group 103b is located on the light-emitting side of the corresponding second light-emitting region Y22. Hereinafter, taking the second light-combining lens group 103a as an example, the second light-combining lens group in the embodiments of the present application will be introduced. The second light-combining lens group 103a may include m light-combining lenses arranged in sequence along the light-emitting direction of the second light-emitting region (such as Figure 2 the y direction in i ). There is a gap between the i-th light-combining lens P i+1 and the (i + 1)-th light-combining lens P Figure 2 Taking m = 2 for illustration. Among them, the i-th light-combining lens P i may include a reflection region and a transmission region. Figure 3 is a schematic structural diagram of a second light-combining lens group provided by an embodiment of the present application. Figure 3 The second light-combining lens group 103a shown may be Figure 2 a left view of the second light-combining lens group 103a shown in Figure 3 As shown in i+1 , the reflection region of the first light-combining lens P1 in the second light-combining lens group 103a may include reflection regions a11, a12, a13, and a14, and the transmission region of the first light-combining lens P1 may include transmission regions b11, b12, and b13. Each reflection region is used to reflect the incident second laser to the light-emitting port K of the light source assembly 10, and each transmission region is used to transmit the incident second laser to the (i + 1)-th light-combining lens P m . The m-th light-combining lens P Figure 2 in the second light-combining lens group 103 is used to reflect the incident second laser to the light-emitting port K. It should be noted that, for the sake of convenience of illustration,

[0032] Optionally, each light-combining lens group and the light-emitting port may be arranged in the target direction (such as Figure 2in the x-direction). The i-th combining lens P of the second combining lens group i The arrangement direction of the transmission region and the reflection region in it can be perpendicular to the light-emitting direction (y-direction) of the laser and perpendicular to the target direction. For example Figure 3 in the combining lens P1, the transmission region and the reflection region can be arranged in the z-direction, and the z-direction can be Figure 2 the direction perpendicular to the paper surface in it, and the z-direction is perpendicular to the x-direction and the y-direction. Exemplarily, the combining lens can have a length direction and a width direction Figure 3 the z-direction in it can be the length direction of the combining lens, and the transmission region and the reflection region in the combining lens can be arranged in the length direction. Optionally, the transmission region and the reflection region in the combining lens can also be arranged in the width direction, and the combining principle of the combining lens in this way is the same as that of Figure 3 the combining lens shown, and the embodiments of the present application will not be described in detail

[0033] In a projection device, each component in the light source assembly 10 can be encapsulated in a housing. The housing of the light source assembly 10 can have a light-emitting port K. The light source assembly 10 can transmit light to the optical engine of the projection device through the light-emitting port K. In the embodiments of the present application, the light-emitting port K of the housing is referred to as the light-emitting port K of the light source assembly 10. The laser 101 in the light source assembly 10 can emit lasers of multiple colors to be transmitted to the light-emitting port K. The multiple light-emitting regions in the laser 101 can be multiple regions in the light-emitting surface of the laser 101. Optionally, the colors of the lasers emitted by different light-emitting regions can be different. The laser 101 can have only one light-emitting direction (such as Figure 2 the y-direction in it), and the light-emitting directions of the respective light-emitting regions in the laser 101 are the same as the light-emitting direction of the laser 101. Since the laser transmitted to the light-emitting port K needs to be the laser obtained by mixing the lasers of multiple colors emitted by the laser 101, and there are also certain requirements for the spot size of the laser transmitted to the light-emitting port K; therefore, the light-emitting port K is not directly arranged in the light-emitting direction of the laser 101, and a combining lens is also arranged between the laser 101 and the light-emitting port K to adjust and mix the laser emitted by the laser 101 and then transmit it to the light-emitting port K. For example, a combining lens group is arranged on the light-emitting side of each light-emitting region of the laser 101 to respectively reflect the laser emitted by the corresponding light-emitting region to the light-emitting port K

[0034] For example Figure 2As shown in the figure, in the embodiment of the present application, a first light combining lens group 102 is provided on the light emitting side of the first light emitting region Y1, and the first light combining lens group 102 includes only one light combining lens as an example for illustration. Optionally, the first light combining lens group 102 may also include multiple light combining lenses. For example, the orthographic projections of the multiple light combining lenses on the first light emitting region have no overlapping regions, and for another example, the surfaces of the multiple light combining lenses for reflecting the first laser may be coplanar.

[0035] In the embodiment of the present application, a second light combining lens group is provided on the light emitting side of the second light emitting region, and the second light combining lens group includes two light combining lenses arranged in sequence along the y direction (respectively the light combining lens P1 and the light combining lens P2), that is, m = 2 as an example. Among the m light combining lenses included in the second light combining lens group, the first light combining lens P1 is the light combining lens closest to the second light emitting region, and the mth light combining lens P m is the light combining lens farthest from the second light emitting region. The second laser emitted by the second light emitting region can be directed towards the corresponding second light combining lens group. Since the first m - 1 light combining lenses among the m light combining lenses have a transmission region and a reflection region, the second laser can pass through the transmission region in the previous light combining lens among the m light combining lenses (that is, the ith light combining lens P i ) and be directed towards the next light combining lens (that is, the ith light combining lens P i+1 ), and the second laser can be reflected by the reflection region to the light output port K when it is directed towards the reflection region in any light combining lens. When the second laser is directed towards the mth light combining lens, it can be directly reflected by the mth light combining lens to the light output port K. Please refer to Figure 2 and Figure 3 . The second laser emitted by the second light emitting region and directed towards the four transmission regions in the first light combining lens P1 is transmitted to the second light combining lens P2, and then is reflected by the light combining lens P2 to be directed towards the light output port K. The second laser directed towards the three reflection regions in the first light combining lens P1 is directly reflected to be directed towards the light output port K.

[0036] There is a gap between the ith light combining lens and the (i + 1)th light combining lens among the m light combining lenses in the second light combining lens group, that is, there is a gap between any two adjacent light combining lenses among the m light combining lenses in the y direction. Therefore, after the second laser emitted by the second light emitting region passes through the ith light combining lens, it travels a certain optical path and then is directed towards the (i + 1)th light combining lens, and then is reflected to the light output port K under the action of the (i + 1)th light combining lens. Therefore, the second laser directed towards the light output port K covers the range from the first light combining lens to the mth light combining lens, and the light spot formed by the second laser at the light output port K is relatively large.

[0037] Compare Figure 1 with Figure 2As can be seen from the light source component, in the related art, the laser beams emitted from the light-emitting region Q2 and the light-emitting region Q3 are directly reflected on a combined light lens and then directed towards the light exit. The laser beam is relatively thin, and the formed light spot at the light exit is small and concentrated more at the center of the light exit. In the light source component provided by the embodiment of the present application, the second laser can be reflected on multiple combined light lenses with gaps between them and then directed towards the light exit. In this way, the relatively thin second laser beam can be divided into multiple beams and then directed towards the light exit. These multiple beams of the second laser can occupy a larger area for transmission, and thus the light spot formed by the second laser at the light exit can be larger, and the size difference between the light spot formed by the second laser and the light spot formed by the first laser can be smaller.

[0038] In summary, in the light source component provided by the embodiment of the present application, the second combined light lens group is located on the light exit side of the second light-emitting region of the laser, and the multiple combined light lenses in the second combined light lens group are arranged along the light exit direction of the second light-emitting region and there are gaps between adjacent two combined light lenses. The combined light lenses before the last combined light lens in the second combined light lens group include a transmission region and a reflection region. The second laser directed towards the reflection region can be directly reflected by the reflection region to the light exit, the second laser directed towards the transmission region can pass through the transmission region and be directed to the next combined light lens, and the second laser directed towards the last combined light lens can be reflected to the light exit. In this way, the second laser emitted from the second light-emitting region of the laser can be directed towards the light exit from multiple combined light lenses with gaps between them. The second laser directed towards the light exit can cover a larger range, and the light spot formed by the second laser at the light exit can be larger. Even if the divergence angle of the first laser emitted from the first light-emitting region is large and the light spot formed by the first laser at the light exit is large, in the present application, through the multiple combined light lenses in the second combined light lens group, it can also be ensured that the size difference between the light spot formed by the second laser and the light spot formed by the first laser is small, and thus the high uniformity of the laser obtained by mixing the first laser and the second laser at the light exit can be ensured.

[0039] In addition, since the laser emitted by the light source component has high uniformity, the projection device using this light source component can form a projection image with a better display effect based on this laser with high uniformity.

[0040] In the embodiment of the present application, the laser 101 can have at least two light-emitting regions. When the laser has multiple second light-emitting regions and the light source component includes multiple second combined light lens groups, each second combined light lens group corresponds to a second light-emitting region, and different second combined light lens groups correspond to different second light-emitting regions. Each second combined light lens group is located on the light exit side of the corresponding second light-emitting region. Figure 2Taking the example that the laser 101 has a first light-emitting region Y1 and two second light-emitting regions Y21 and Y22 for illustration. Optionally, the laser 101 may also have only one second light-emitting region, or the laser 101 may have three or more second light-emitting regions, or the laser 101 may have multiple first light-emitting regions. The embodiments of the present application do not make any limitations in this regard.

[0041] In the embodiments of the present application, the divergence angle of the laser emitted by any second light-emitting region may be smaller than the divergence angle of the laser emitted by any first light-emitting region. By way of example, Figure 2 in the first light-emitting region Y1 may emit red laser light, the second light-emitting region Y21 may emit green laser light, and the second light-emitting region Y22 may emit blue laser light. The divergence angles of the blue laser light and the green laser light may both be smaller than the divergence angle of the red laser light. As another example, assuming that the divergence angles of the red laser light and the blue laser light emitted by the laser are both larger than the divergence angle of the green laser light, then the light-emitting regions emitting the red laser light and the blue laser light may both be determined as the first light-emitting regions, and only the light-emitting region emitting the green laser light may be determined as the second light-emitting region. Furthermore, a second light-combining lens group may be provided only on the light-emitting side of the light-emitting region emitting the green laser light.

[0042] The laser 101 in the light source assembly 10 provided by the embodiments of the present application may be a multi-chip laser diode (MCL) type laser. Figure 4 is a schematic structural diagram of an MCL type laser provided by the embodiments of the present application, Figure 2 The shown laser 101 may be Figure 4 a schematic diagram of the cross-section d-d' after flipping the shown laser 101. As Figure 4 shown, the MCL type laser may include a plurality of light-emitting chips ( Figure 3 not shown) arranged in an array and encapsulated in the same package G. Each light-emitting chip can independently emit laser light, and the laser light emitted by each light-emitting chip can be emitted through its corresponding collimating lens T. As Figure 4 shown, the laser 101 may include 24 light-emitting chips arranged in 6 rows and 4 columns. Among them, the first light-emitting region Y1 may include Figure 4The area where the two rightmost columns of light-emitting chips are located. The second light-emitting area Y21 may include the area where the leftmost column of light-emitting chips is located, and the second light-emitting area Y22 may include the area where the second column of light-emitting chips is located. Since the MCL-type laser has a small volume and the emitted laser has a high brightness, the light source component provided in the embodiment of the present application using this laser can reduce the volume of the light source component, which is beneficial to the miniaturization of the projection device. It should be noted that in the embodiment of the present application, taking the laser 101 that may include 24 light-emitting chips arranged in 6 rows and 4 columns as an example, the laser 101 may also include 20 light-emitting chips arranged in 4 rows and 5 columns, or 15 light-emitting chips arranged in 3 rows and 5 columns, or 14 light-emitting chips arranged in 2 rows and 7 columns. The embodiment of the present application does not make any limitations.

[0043] Please continue to refer to Figure 2 , in the light source component 10, each light-emitting area may be arranged along the target direction (that is, the x direction in Figure 2 ), and then each light-combining lens group may also be arranged along the target direction. Since the light-combining lens group needs to reflect the incident laser to the light outlet, each light-combining lens group and the light outlet may be arranged in the target direction. This target direction may intersect with the light-emitting direction of the laser 101. For example, this target direction may be perpendicular to the light-emitting direction of the laser 101, or this target direction may also form an acute angle or an obtuse angle with the light-emitting direction of the laser 101. Optionally, each light-emitting area may also be arranged in a scattered manner or in a circular arrangement or may be arranged in other ways. The embodiment of the present application does not make any limitations.

[0044] In the embodiment of the present application, the light source component 10 includes at least two light-combining lens groups, and each light-combining lens group and the light outlet may be arranged in the target direction. Therefore, there may be a light-combining lens group located between the light outlet and another light-combining lens group. If this light-combining lens group is to direct the reflected laser to the light outlet, it is necessary to ensure that the laser passes through this other light-combining lens group. Therefore, the light-combining lens group located between the light outlet and any light-combining lens group in the light source component is also used for: transmitting the laser emitted from this any light-combining lens group.

[0045] Exemplarily, Figure 2In the second light combining lens group Y22 is located between the second light combining lens group Y21 and the light exit K. Therefore, the second light combining lens group Y22 can also be used to transmit the laser (such as green laser) emitted by the second light combining lens group Y21, that is, the light combining lens in the second light combining lens group Y22 is used to transmit the green laser. The first light combining lens group Y1 is located between the second light combining lens group Y21 and the light exit K, and is also located between the second light combining lens group Y22 and the light exit K. Therefore, the first light combining lens group Y1 can also be used to transmit the laser (such as green laser) emitted by the second light combining lens group Y21 and the laser (such as blue laser) emitted by the second light combining lens group Y22, that is, the light combining lens in the first light combining lens group Y1 is also used to transmit the green laser and the blue laser. Therefore, the second light combining lens group Y21 can reflect the green laser, the second light combining lens group Y22 can reflect the blue laser and transmit the green laser, and the first light combining lens group Y1 can reflect the red laser and transmit the green laser and the blue laser.

[0046] The following introduces the second light combining lens group in the light source assembly with reference to the accompanying drawings:

[0047] In the embodiment of the present application, the m light combining lenses of the second light combining lens group may intersect with the light exit direction of the second light emitting region (such as the y direction in Figure 2 ). For example, the light receiving surface of the m light combining lenses for the laser emitted by the second light emitting region intersects with the light exit direction, and the light receiving surface of the light combining lens is the surface of the light combining lens close to the second light emitting region. Optionally, the m light combining lenses of the second light combining lens group may be parallel, such as the light receiving surfaces of the m light combining lenses for the laser emitted by the second light emitting region are parallel. It should be noted that each light combining lens in the second light combining lens group may have a plate-like structure, and the plate-like structure has two relatively large parallel plate surfaces and a plurality of relatively small side surfaces connecting the two plate surfaces, and the light receiving surface is one of the two plate surfaces close to the second light emitting region. Since the thickness of the light combining lens is relatively thin, the light combining lens can be regarded as a plane, so it can also be directly said that the light combining lens intersects with the light exit direction, and the m light combining lenses are parallel. Optionally, the included angle range between the light combining lens of the second light combining lens group and the light exit direction of the second light emitting region may be 43 degrees to 45 degrees. Optionally, the included angle range between the light combining lens in the first light combining lens group and the light exit direction of the laser may also be 43 degrees to 45 degrees.

[0048] In the embodiment of the present application, among the m light combining lenses of the second light combining lens group, at least the first light combining lens includes a plurality of reflection regions and a plurality of transmission regions, and the reflection regions and the transmission regions may be alternately arranged. Exemplarily, please continue to refer to Figure 3, the first combining lens P1 in the second combining lens group 103a includes a reflection area a1, a transmission area b1, a reflection area a2, a transmission area b2, a reflection area a3, a transmission area b3, and a reflection area a4 arranged in sequence along the z direction. In this way, the laser beam emitted from the second light-emitting area can be divided into multiple beams and exit in a relatively large area, and the alternating arrangement of the transmission area and the reflection area can ensure that the areas reflecting the laser in each combining lens are evenly distributed, thereby ensuring that the laser beams emitted from each combining lens are relatively evenly distributed. Optionally, when m≥3, in addition to the first combining lens, there may also be other combining lenses (such as the second combining lens) including multiple reflection areas and multiple transmission areas. Optionally, the areas of each transmission area and each reflection area can be the same to further ensure that the laser beams emitted from each combining lens are relatively evenly distributed.

[0049] It should be noted that Figure 2 taking the second combining lens group including two combining lenses (i.e., m = 2) as an example only, and Figure 3 taking the first combining lens including four reflection areas and three transmission areas, and both ends of the first combining lens being reflection areas as an example only. Optionally, the second combining lens group may also include three, four or even more combining lenses, the number of reflection areas in the first combining lens may also be three, five or other numbers, and the number of transmission areas may also be two, three or other numbers; both ends of the first combining lens may also be transmission areas, in which case the number of transmission areas in the first combining lens is more than the number of reflection areas; or one end of the first combining lens may be a transmission area and the other end may be a reflection area, in which case the number of transmission areas and reflection areas in the first combining lens is the same; the areas of each transmission area and each reflection area may also be different, and the embodiments of the present application do not make any limitations.

[0050] Optionally, the number of transmission areas and reflection areas in the second combining lens group may be related to the number and arrangement of the light-emitting chips in the second light-emitting area. For example, the sum of the number of transmission areas and reflection areas in the first combining lens of the second combining lens group is equal to the number of light-emitting chips arranged in a certain direction in the second light-emitting area, and the arrangement direction of the transmission areas and reflection areas is parallel to the arrangement direction of the light-emitting chips in the second light-emitting area. For example, in the embodiments of the present application, the laser may include light-emitting chips arranged in 4 rows and 7 columns. The second laser emitted from the second light-emitting area may be emitted by 7 light-emitting chips in one column of the laser, then the laser beam emitted from the second light-emitting area can be divided into 7 beams. For example, if the sum of the number of transmission areas and reflection areas in the first combining lens of the second combining lens group is 7, and it can be ensured that the laser emitted by each light-emitting chip is directed to a transmission area or a reflection area. Another example is that if the 7 light-emitting chips are arranged in the z direction, then the transmission areas and reflection areas of the combining lenses in the second combining lens group can also be arranged in the z direction.

[0051] In an alternative embodiment, the number of light combining lenses in the second light combining lens group is more than 2, that is, m≥3. At this time, the j-th light combining lens among the m light combining lenses may have a first transmission region, and the (j + 1)-th light combining lens may have a second transmission region corresponding to the first transmission region, where 1≤j<m - 1. On the second light emitting region, the orthographic projection of the first transmission region and the orthographic projection of the second transmission region corresponding to the first transmission region at least partially overlap, thereby ensuring that at least part of the second laser light incident on the first transmission region can be directed towards the second transmission region corresponding to the first transmission region.

[0052] Figure 5 is a schematic structural diagram of another light source assembly provided by an embodiment of the present application, and Figure 5 taking the laser 101 in the light source assembly 10 having two light emitting regions and the second light combining lens group including three light combining lenses, that is, m = 3, as an example for explanation. As Figure 5 shown, the laser 101 has a first light emitting region Y1 and a second light emitting region Y2, and the second light combining lens group 103 includes three light combining lenses P1, P2, and P3. Figure 6 is a schematic structural diagram of another second light combining lens group provided by an embodiment of the present application. Figure 6 The second light combining lens group 103 shown in the figure may be Figure 5 a left view of the second light combining lens group 103 shown in the figure. The first light combining lens P1 includes a transmission region b1, a reflection region a1, a transmission region b2, a reflection region a2, and a transmission region b3 arranged along the z direction; the second light combining lens P2 includes a reflection region a3, a transmission region b4, and a reflection region a4 arranged along the target direction. The transmission region b2 may be the first transmission region, and the transmission region b4 may be the second transmission region corresponding to the transmission region b2. The orthographic projection of the transmission region b2 on the second light emitting region Y2 and the orthographic projection of the transmission region b4 on the second light emitting region Y2 at least partially overlap, for example, the orthographic projection of the transmission region b2 on the second light emitting region Y2 covers a part of the region of the orthographic projection of the transmission region b4 on the second light emitting region Y2. In the embodiment of the present application, the light emitting region of the laser includes an exit surface perpendicular to its light exit direction (that is, the y direction), so the orthographic projection of the transmission region on the second light emitting region is the same as the orthographic projection of the transmission region on a plane perpendicular to the y direction.

[0053] Thus, the second laser emitted by the second light-emitting region Y2 can be directed towards the first combining lens P1, and the second laser directed towards the transmission region b1 in the combining lens P1 passes through the transmission region b1 and is directed towards the reflection region a3 in the second combining lens P2, and then is reflected by the reflection region a3 to the light exit K; the second laser directed towards the transmission region b3 passes through the transmission region b3 and is directed towards the reflection region a4 in the second combining lens P2, and then is reflected by the reflection region a4 to the light exit K. The second laser directed towards the transmission region b2 in the combining lens P1 passes through the transmission region b2 and is directed towards the transmission region b4 in the second combining lens P2, and then continues to pass through the transmission region b4 and is directed towards the third combining lens P3, and is reflected by the third combining lens P3 to the light exit K. Therefore, the second laser emitted by the second light-emitting region Y2 can be split by the three combining lenses, so that the second laser is emitted from the three combining lenses respectively, thereby expanding the transmission range of the second laser and making the spot of the second laser at the light exit K larger.

[0054] Figure 4 Taking the case where the size of the transmission region b2 is smaller than the size of the transmission region b4, and the orthographic projection area of the transmission region b2 on the second light-emitting region Y2 is smaller than the orthographic projection area of the transmission region b4 on the second light-emitting region Y2 as an example; the embodiment of the present application does not limit the size relationship between the transmission region b2 and the transmission region b4. In an optional example, the sizes of the transmission region b2 and the transmission region b4 can be the same, and the orthographic projection of the transmission region b2 on the second light-emitting region Y2 can completely coincide with the orthographic projection of the transmission region b4 on the second light-emitting region Y2. In another optional example, the size of the transmission region b2 can be larger than the size of the transmission region b4, and the orthographic projection area of the transmission region b4 on the second light-emitting region Y2 can be larger than the orthographic projection area of the transmission region b2 on the second light-emitting region Y2. At this time, a part of the second laser directed from the transmission region b2 to the second combining lens P2 passes through the transmission region b4 and is directed towards the third combining lens P3, and the other part can be directed towards the reflection region a3 or a4 of the second combining lens P2, and then is reflected on the reflection region a3 or a4 of the second combining lens P2. The setting method of the transmission region and the reflection region in each combining lens can be flexibly set as needed, and only need to ensure that the second laser passing through the transmission region in the previous combining lens can be reflected on the subsequent combining lens, and the embodiment of the present application does not limit it. Optionally, the number of reflection regions in the subsequent combining lens among the m combining lenses can be less than or equal to the number of transmission regions in the previous combining lens.

[0055] In an alternative embodiment, the light source assembly includes a plurality of second light emitting regions and a plurality of second light combining lens groups. For any two of the second light combining lens groups: in a plane perpendicular to the target direction, the orthographic projection of the target reflection region and the orthographic projection of the target transmission region at least partially overlap. Wherein, the target reflection region belongs to the light combining lens of the second light combining lens group far from the light exit, and the target transmission region belongs to the light combining lens of the second light combining lens group close to the light exit. The target reflection region can reflect the incident second laser to the target transmission region, so that the second laser passes through the target transmission region and shoots towards the light exit. Thus, that is, the transmission regions and reflection regions in the two light combining lens groups are arranged in an interleaved manner. Optionally, the number of transmission regions in one light combining lens group of the two light combining lens groups is equal to the number of reflection regions in the other light combining lens group.

[0056] Exemplarily, Figure 7 is a partial structural schematic diagram of a light source assembly provided by an embodiment of the present application. Figure 7 is Figure 2 a top view of the first light combining lens in the second light combining lens groups 103a and 103b, the first light combining lens group 102, and the light exit K in the light source assembly of. Please refer to Figure 2 and Figure 7 , for the two second light combining lens groups 103a and 103b therein, the second light combining lens group 103a is far from the light exit K, the second light combining lens group 103b is close to the light exit K, the reflection region in the second light combining lens group 103a is the target reflection region, and the transmission region in the second light combining lens group 103b is the target transmission region. In a plane perpendicular to the target direction (x direction), the orthographic projection of the reflection region in the light combining lens of the second light combining lens group 103a coincides with the orthographic projection of the transmission region in the light combining lens of the second light combining lens group 103b. For example, the first light combining lens in the second light combining lens group 103a includes four reflection regions and three transmission regions, and the first light combining lens in the second light combining lens group 10b includes three reflection regions and four transmission regions. As Figure 7As shown, the first combining lens in the second combining lens group 103a includes a reflection area a11, a transmission area b11, a reflection area a12, a transmission area b12, a reflection area a13, a transmission area b13, and a reflection area a14 arranged along the z direction. The first combining lens in the second combining lens group 10b includes a transmission area b21, a reflection area a21, a transmission area b22, a reflection area a22, a transmission area b23, a reflection area a23, and a transmission area b24 arranged along the z direction. The reflection area a11 can reflect the second laser emitted by the second light-emitting area Y21 to the transmission area b21, and then pass through the transmission area b21 and shoot towards the light exit K; the reflection area a12 can reflect the second laser emitted by the second light-emitting area Y21 to the transmission area b22, and then pass through the transmission area b22 and shoot towards the light exit K; the reflection area a13 can reflect the second laser emitted by the second light-emitting area Y21 to the transmission area b23, and then pass through the transmission area b23 and shoot towards the light exit K; the reflection area a14 can reflect the second laser emitted by the second light-emitting area Y21 to the transmission area b24, and then pass through the transmission area b24 and shoot towards the light exit K.

[0057] In the embodiments of the present application, when the light source assembly includes multiple second combining lens groups, the number of combining lenses in each second combining lens group may be the same or different, and the areas of the combining lenses in each second combining lens group may be the same or different, which is not limited in the embodiments of the present application.

[0058] In the embodiments of the present application, the function of the second combining lens group can be realized in the following manner:

[0059] In the first alternative implementation manner, the i-th combining lens in the second combining lens group includes: a light-transmitting substrate and a dichroic film attached to the light-transmitting substrate. The i-th combining lens realizes the transmission of laser in a fixed band and the reflection of laser in a fixed band through the function of the dichroic film. The dichroic film in the transmission area of the i-th combining lens is used for: transmitting the second laser emitted by the second light-emitting area corresponding to the second combining lens group, and the dichroic film in the reflection area of the i-th combining lens is used for: reflecting the second laser emitted by the second light-emitting area corresponding to the second combining lens group in the incident laser. The dichroic films in the transmission area and the reflection area can also transmit the laser emitted by other combining lenses on the side of the i-th combining lens away from the light exit. Exemplarily, Figure 2 in the first combining lens in the second combining lens group 103a, the dichroic film in the reflection area can reflect green light, and the dichroic film in the transmission area can transmit green light; in the first combining lens in the second combining lens group 103b, the dichroic film in the reflection area can transmit green light and reflect blue light, and the dichroic film in the transmission area can transmit green light and blue light.

[0060] In the second alternative implementation, the i-th combining lens in the second combining lens group includes a light-transmitting substrate and a reflective coating located on the light-transmitting substrate. The reflection region in the i-th combining lens includes the region of the i-th combining lens where the reflective coating is provided, and this reflective coating is used to reflect the second laser emitted by the corresponding second light-emitting region. The transmission region in the i-th combining lens includes the region of the i-th combining lens where no reflective coating is provided. In this way, the reflection of the incident second laser by the reflection region in the i-th combining lens and the transmission of the incident second laser by the transmission region are realized. Optionally, when the reflection region in the i-th combining lens does not need to transmit any wavelength band of laser, this reflective coating can reflect light in all wavelength bands. When the reflection region in the i-th combining lens also needs to transmit a certain wavelength band of laser, this reflective coating can have the function of transmitting the laser of this wavelength band. At this time, the function of this reflective coating is similar to that of a dichroic film.

[0061] In the third alternative implementation, the i-th combining lens in the second combining lens group includes a plurality of sub-lenses. Each reflection region of the i-th combining lens includes one sub-lens, and no material needs to be provided in the transmission region of the i-th combining lens. The formation method of this sub-lens can refer to the formation methods of the reflection regions in the above first alternative implementation and the second alternative implementation.

[0062] In the above second alternative implementation and the third alternative implementation, this transmission region can transmit light in all wavelength bands, and this reflection region can reflect light in all wavelength bands. Optionally, in these two methods, if the light source assembly includes a plurality of second combining lens groups, the transmission regions and reflection regions in these plurality of second combining lens groups can be designed in the above-mentioned interlaced setting manner. In this way, the light reflected by the reflection region in a certain second combining lens group can be directed to the light outlet through the transmission region in other second combining lens groups. Therefore, there is no need to provide a dichroic film in this transmission region, which can avoid the problems of increased manufacturing cost caused by the need to provide dichroic films at all positions of the combining lenses in the other second combining lens groups and the relatively complicated manufacturing process. And for the above third alternative implementation, no material needs to be provided in the transmission region, so the manufacturing cost of the light source assembly can be further saved.

[0063] Optionally, for the m-th combining lens in the second combining lens group: One implementation method of the function of this m-th combining lens can refer to the above first alternative implementation method of the i-th combining lens. In another implementation method, if a certain second combining lens group is the combining lens group farthest from the light outlet in the light source assembly, then the m-th combining lens in this second combining lens group can be a reflective sheet, and this reflective sheet can reflect light in all wavelength bands. For example, this reflective sheet can be a metal sheet (such as an aluminum sheet or a copper sheet), etc. Or, the structure of the m-th combining lens can also refer to the above second alternative implementation method of the i-th combining lens.

[0064] For the implementation of the function of the combining lens in the first combining lens group, reference may be made to the first alternative implementation of the i-th combining lens described above. As Figure 2 In Figure 2 , the dichroic film of the combining lens in the first combining lens group can be used to transmit green light and blue light and reflect red light.

[0065] Figure 8 FIG. Figure 8 is a schematic structural diagram of another light source assembly provided by an embodiment of the present application. As Figure 8 shown, the light source assembly 10 may further include: a housing 104. The above-mentioned laser 101, the first combining lens group 102, and the second combining lens group 103 may all be disposed in the accommodation cavity inside the housing 104.

[0066] Optionally, the light source assembly 10 may further include a phase retardation plate 105. The phase retardation plate 105 may be located on the light-emitting side of the second light-emitting region of the laser and between the second light-emitting region and the second combining lens group 103. The second laser (such as green laser or blue laser) emitted from the second light-emitting region may be adjusted in polarization direction by the phase retardation plate 105 and then projected onto the second combining lens group 103. Since the polarization directions of the lasers emitted from the first light-emitting region and the second light-emitting region are usually different, a phase retardation plate 105 may be disposed on the light-emitting side of the second light-emitting region so that the polarization direction of the second laser passing through the phase retardation plate 105 is the same as that of the first laser (such as red laser). Optionally, the phase retardation plate 105 may be fixed inside the housing 104 by being clamped by a clamping member, so as to avoid the fixing device of the phase retardation plate 105 blocking the light path. For example, the phase retardation plate 105 may be a half-wave plate. Optionally, the light-emitting region emitting green laser is adjacent to the light-emitting region emitting blue laser, so only one half-wave plate may be provided in the light source assembly 10 to adjust the phases of the green laser and the blue laser.

[0067] In the embodiment of the present application, an integrated base may also be disposed in the accommodation cavity of the housing 104. Each combining lens group may be fixed by the integrated base to reduce the cumulative tolerance of multiple structural assemblies and facilitate maintaining the same setting angles and relative position relationships between the combining lenses. Optionally, the phase retardation plate 105 may also be fixed by the integrated base.

[0068] Optionally, the light source assembly 10 may further include a converging lens 106. The converging lens 106 may be located at the light exit K of the light source assembly 10. The laser light emitted from each light-emitting region of the laser 101 may be reflected on the corresponding light-combining lens group, and then mixed into a beam of laser light, which is directed towards the converging lens 106 at the light exit K of the light source assembly 10. The converging lens 106 may converge the received light to reduce the light spot and then direct it towards the optical engine, such as towards the optical path shaping component in the optical engine. For example, the optical path shaping component includes a light guide tube for homogenizing the light. The different-color laser lights emitted from each light-emitting region of the laser 10 can be mixed to obtain white light, and a white light spot can be formed at the converging lens 106. And due to the arrangement of the second light-combining lens group in the embodiment of the present application, the sizes of the light spots separately formed by the laser lights of each color on the converging lens 106 are relatively close, so the uniformity of the white light spot formed on the converging lens 106 is relatively high.

[0069] Optionally, the light source assembly 10 may further include a diffusing part ( Figure 8 not shown), which may be located on the light exit path of the converging lens 106. The laser light emitted from the light exit is diffused by the diffusing part and then incident on the beam shaping component. The diffusing part may be a diffusing wheel structure, including a rotating diffusing sheet. By rotating and diffusing the light through the diffusing sheet, the speckle of the light can be dissipated, so as to improve the quality of the light emitted by the light source assembly and reduce the speckle effect of the projected image.

[0070] In summary, in the light source assembly provided by the embodiment of the present application, the second light-combining lens group is located on the light exit side of the second light-emitting region of the laser, and the multiple light-combining lenses in the second light-combining lens group are arranged along the light exit direction of the second light-emitting region and there is a gap between adjacent two light-combining lenses. The light-combining lenses before the last light-combining lens in the second light-combining lens group include a transmission region and a reflection region. The second laser light directed towards the reflection region can be directly reflected by the reflection region to the light exit, the second laser light directed towards the transmission region can pass through the transmission region and be directed towards the next light-combining lens, and the second laser light directed towards the last light-combining lens can be reflected to the light exit. In this way, the second laser light emitted from the second light-emitting region of the laser can be directed towards the light exit through multiple light-combining lenses with gaps between them. The second laser light directed towards the light exit can cover a larger range, and the light spot formed by the second laser light at the light exit can be larger. Even if the divergence angle of the first laser light emitted from the first light-emitting region is large and the light spot formed by the first laser light at the light exit is large, in the present application, through the multiple light-combining lenses in the second light-combining lens group, it can be ensured that the size difference between the light spot formed by the second laser light and the light spot formed by the first laser light is small, thereby ensuring that the uniformity of the laser light obtained by mixing the first laser light and the second laser light at the light exit is relatively high.

[0071] Figure 9 is a schematic structural diagram of a projection device provided by an embodiment of the present application. As Figure 9As shown in the figure, the projection device may include: a light source assembly 10, an optical engine 20, and a lens 30. The light source assembly 10 is configured to emit light to the optical engine 20. The optical engine 20 is configured to modulate the incident light and then emit it to the lens 30. The lens 30 is configured to project the incident light. The light source assembly may be any of the above light source assemblies 10. Since the laser emitted by the light source assembly 10 has high uniformity, the projection device using this light source assembly can form a projection image with a better display effect based on the laser with high uniformity.

[0072] Optionally, the optical engine may include a light homogenizing component, a lens group, a total internal reflection (TIR) prism group, and a light modulation component. The light emitted by the light source assembly sequentially passes through the light homogenizing component, the lens group, the total internal reflection (TIR) prism group, and the light modulation component and then is emitted to the lens. The exit surface of the light homogenizing component and the incident surface of the light modulation device are in a conjugate object-image relationship. The light modulation component may be a Liquid Crystal on Silicon (LCOS), a Liquid Crystal Display (LCD), or a Digital Micromirror Device (DMD).

[0073] The term "and / or" in this application merely describes the association relationship of associated objects and indicates that there can be three relationships. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after. The term "at least one of A, B, and C" in this application represents that there can be seven relationships, which can represent: A exists alone, B exists alone, C exists alone, A and B exist simultaneously, A and C exist simultaneously, C and B exist simultaneously, and A, B, and C exist simultaneously. In the embodiments of this application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless otherwise clearly defined.

[0074] The above are only optional embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A light source assembly, characterized in that, The light source assembly includes: A laser, having a first light-emitting region and a second light-emitting region; the first light-emitting region is used to emit a first laser, the second light-emitting region is used to emit a second laser, and the divergence angle of the first laser is greater than that of the second laser; A first light-combining lens group, located on the light-emitting side of the first light-emitting region, for reflecting the first laser emitted from the first light-emitting region to the light-emitting port of the light source assembly; A second light-combining lens group, located on the light-emitting side of the second light-emitting region; the second light-combining lens group includes m light-combining lenses arranged in sequence along the light-emitting direction of the second light-emitting region, and there is a gap between the i-th light-combining lens and the (i + 1)-th light-combining lens among the m light-combining lenses, m≥2, 1≤i≤m - 1; wherein, the i-th light-combining lens includes a reflection region and a transmission region, the reflection region is used to reflect the incident second laser to the light-emitting port, and the transmission region is used to transmit the incident second laser to the (i + 1)-th light-combining lens; the m-th light-combining lens is used to reflect the incident second laser to the light-emitting port; The first light-combining lens group, the second light-combining lens group and the light-emitting port are arranged in a target direction, and the target direction intersects with the light-emitting direction of the laser; The light source assembly includes a plurality of the second light-emitting regions and a plurality of the second light-combining lens groups; each second light-combining lens group corresponds to one second light-emitting region, and different second light-combining lens groups correspond to different second light-emitting regions, and each second light-combining lens group is located on the light-emitting side of the corresponding second light-emitting region; For any two of the second light-combining lens groups: in a plane perpendicular to the target direction, the orthographic projection of the target reflection region and the orthographic projection of the target transmission region at least partially overlap; Wherein, the target reflection region belongs to the light-combining lens of the second light-combining lens group far from the light-emitting port, and the target transmission region belongs to the light-combining lens of the second light-combining lens group close to the light-emitting port; the target reflection region is used to: reflect the incident second laser to the target transmission region, so that the second laser passes through the target transmission region and shoots towards the light-emitting port.

2. The light source assembly according to claim 1, characterized in that, The first light-combining lens among the m light-combining lenses includes a plurality of the reflection regions and a plurality of the transmission regions, and the reflection regions and the transmission regions are arranged alternately.

3. The light source assembly according to claim 1, characterized in that, The m≥3; The j-th light-combining lens among the m light-combining lenses has a first transmission region, and the (j + 1)-th light-combining lens has a second transmission region corresponding to the first transmission region, 1≤j<m - 1; on the second light-emitting region, the orthographic projection of the first transmission region and the orthographic projection of the second transmission region corresponding to the first transmission region at least partially overlap; The first transmission region is used to shoot at least part of the second laser incident thereon towards the second transmission region corresponding to the first transmission region.

4. The light source assembly according to claim 1, characterized in that, The light-combining lens group located between the light-emitting port and any light-combining lens group is also used to: transmit the laser emitted from the any light-combining lens group.

5. The light source assembly according to any one of claims 1 to 4, characterized in that, The i-th light-combining lens includes a light-transmitting substrate and a reflective coating located on the light-transmitting substrate. The reflection area includes the area of the i-th light-combining lens where the reflective coating is provided, and the transmission area includes the area of the i-th light-combining lens where the reflective coating is not provided.

6. The light source assembly according to any one of claims 1 to 4, characterized in that, The i-th light-combining lens includes: a light-transmitting substrate and a dichroic film attached to the light-transmitting substrate; the dichroic film in the transmission area is used to transmit the incident second laser, and the dichroic film in the reflection area is used to reflect the incident second laser.

7. The light source assembly according to any one of claims 1 to 4, characterized in that, In the light source assembly, the light-combining lens group farthest from the light output port is the second light-combining lens group, and the m-th light-combining lens in the light-combining lens group farthest from the light output port is a reflector.

8. The light source assembly according to any one of claims 1 to 4, characterized in that, The m light-combining lenses are parallel.

9. A projection device, characterized in that, The projection device includes: the light source assembly according to any one of claims 1 to 8, and an optical engine and a lens; The light source assembly is used to emit light to the optical engine, the optical engine is used to converge the light emitted by the light source assembly to the lens, and the lens is used to project the light converged by the optical engine.

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