WO2021078101A1

WO2021078101A1 - Laser projection light source and laser projection device

Info

Publication number: WO2021078101A1
Application number: PCT/CN2020/121934
Authority: WO
Inventors: 田新团; 周伯禹
Original assignee: 青岛海信激光显示股份有限公司
Priority date: 2019-10-25
Filing date: 2020-10-19
Publication date: 2021-04-29
Also published as: CN112711166A

Abstract

A laser projection light source (1) and a laser projection device, which relate to the technical field of laser projection devices, and which are used to solve the problem of how to reduce the volume and structural complexity of a laser projection light source while increasing the brightness of light beams emitted by the laser projection light source. The laser projection light source comprises: a housing (11), two lasers (12) and a light path assembly (13). The housing (11) comprises a first side wall (200), a second side wall (300) and a third side wall (400); the first side wall (200) and the second side wall (300) are each provided with one accommodating opening (111), and the third side wall (400) is provided with one light outlet (112). The two lasers (12) are installed at the accommodating openings (111) on the first side wall (200) and second side wall (300), respectively. Each laser (12) emits light toward the inside of the housing (11). The light exit surfaces of each laser (12) comprise a plurality of light exit regions (121, 122, 123), and the plurality of light exit regions (121, 122, 123) are used to emit light of a plurality of colors. The optical path assembly (13) is provided in the housing (11). The laser projection light source (1) is used for the laser projection device.

Description

Laser projection light source and laser projection equipment

This application claims priority to be submitted to the Chinese Patent Office on October 25, 2019, with application number 201911025064.6, and title of invention "a laser projection light source and laser projection equipment", the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the technical field of laser projection equipment, and in particular to a laser projection light source and laser projection equipment.

Background technique

Laser projection light sources are an important part of laser projection equipment such as laser TVs and laser projectors, and are used to provide illumination beams. In order to improve the brightness of the light beam emitted by the laser projection light source, multiple lasers can be arranged in the laser projection light source, and the brightness of the light beam emitted by the laser projection light source can be doubled by combining the light beams emitted by multiple lasers into one beam. However, since the laser is usually a monochromatic laser (such as a blue laser, a red laser or a green laser), and the light beam emitted by the laser projection light source is a white light beam, it is necessary to install multiple fluorescent wheels in the laser projection light source. Each laser has a one-to-one correspondence, and each fluorescent wheel generates another two colors of laser light under the excitation of the monochromatic laser emitted by the laser corresponding to the fluorescent wheel. The other two colors of laser light can be mixed with the monochromatic laser emitted by the laser. To form white light, in order to achieve the purpose of light mixing, the laser projection light source needs to be equipped with multiple sets of lenses to correspond to multiple fluorescent wheels one-to-one. Each set of lenses is used to change the transmission path of the other two colors of laser light to make the The other two colors of laser light are mixed with the monochromatic laser light emitted by the laser. After mixing to form a white light, multiple white lights are combined into one beam to increase the brightness of the light beam emitted by the laser projection light source. In this way, more parts are included in the laser projection light source, thereby increasing the structural complexity and volume of the laser projection light source.

Summary of the invention

The first aspect of the present application provides a laser projection light source, including: a housing, two lasers, and an optical path assembly, wherein the housing includes a first side wall and a second side wall opposite to each other, and is connected to the first side wall and the second side wall. A third side wall with two vertical side walls. The first side wall and the second side wall are respectively provided with an accommodating opening, and the third side wall is provided with a light outlet; the two lasers are respectively installed on the first side At the accommodating openings on the wall and the second side wall, each laser emits light toward the inside of the housing, and the light-emitting surface of each laser includes multiple light-emitting areas, and the multiple light-emitting areas are used to emit light of multiple colors; The component is arranged in the housing, and the optical path component is used to combine the lights of multiple colors emitted by the two lasers respectively, and make the combined two beams of light exit toward the light outlet.

In the second aspect, an embodiment of the present application provides a laser projection device, including a laser projection light source, an optical machine, and a projection lens that are sequentially connected, wherein the laser projection light source is the laser projection light source according to any one of the above technical solutions, the optical machine It is used to modulate the illumination beam emitted by the laser projection light source to generate an image beam and project the image beam to the projection lens, which is used to image the image beam.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is one of the three-dimensional views of a laser projection light source provided by an embodiment of this application;

2 is the second three-dimensional view of a laser projection light source provided by an embodiment of this application;

3 is one of the optical path diagrams of the first optical path component in a laser projection light source provided by an embodiment of this application;

4 is the second optical path diagram of the first optical path component in a laser projection light source provided by an embodiment of the application;

FIG. 5 is a schematic structural diagram of a laser in a laser projection light source provided by an embodiment of the application;

6 is a schematic structural diagram of a laser, a light combining lens group, and a first wave plate in a laser projection light source provided by an embodiment of the application;

FIG. 7 is a schematic structural diagram of a laser, a light combining lens group, a second wave plate, and a third wave plate in a laser projection light source provided by an embodiment of the application;

FIG. 8 is an optical path diagram of a second type of optical path component in a laser projection light source provided by an embodiment of the application;

FIG. 9 is a schematic structural diagram of a laser projection device provided by an embodiment of the application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

In the description of this application, it should be noted that the terms "installation", "connection", and "connection" should be understood in a broad sense, unless otherwise clearly specified and limited. For example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be mechanically connected; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood under specific circumstances.

The laser projection light source is an important part of the laser projection equipment, and the laser projection light source is used to provide an illuminating beam.

In the first aspect, an embodiment of the present application provides a laser projection light source 1. The laser projection light source 1 includes: a housing 11, two lasers 12, and an optical path assembly 13, wherein, as shown in FIGS. 1 and 2, the housing 11 includes a first side wall 200 and a second side wall 300 opposite to each other, and a third side wall 400 perpendicular to the first side wall 200 and the second side wall 300. An accommodating opening 111 is respectively provided, and a light exit 112 is provided on the third side wall 400; two lasers 12 are respectively installed at the accommodating opening 111 on the first side wall 200 and the second side wall 300, each The lasers 12 all emit light toward the inside of the housing 11. As shown in FIG. 5, the light-emitting surface of each laser 12 includes multiple light-emitting areas, and the multiple light-emitting areas are used to emit light of multiple colors; as shown in FIG. 3 or FIG. 8 As shown, the optical path assembly 13 is disposed in the housing 11, and the optical path assembly 13 is used to combine the lights of multiple colors emitted by the two lasers 12 respectively, and cause the combined two lights to be emitted toward the light exit 112.

The laser projection light source provided by the present application combines multiple colors of light emitted by two lasers 12 through an optical path assembly 13, and causes the combined two beams to be emitted toward the light outlet 112 to achieve multiple beams. The superposition of light can make the laser projection light source have higher brightness. At the same time, as shown in FIG. 5, since the light-emitting surfaces of the lasers in the laser projection light source 1 all include multiple light-emitting areas, the multiple light-emitting areas are used to emit light of multiple colors. Therefore, the laser projection provided in this application There is no need to provide a large number of lenses in the light source 1, so the volume and structural complexity of the laser projection light source 1 can be reduced.

The light-emitting surface of the laser 12 may include two light-emitting areas, three light-emitting areas, or four light-emitting areas, etc., which are not specifically limited herein. Optionally, the number of light exit areas included in the light exit surface of the laser 12 is equal to the number of colors emitted by the light exit surface of the laser 12, and each light exit area is used to emit light of one color.

In some embodiments, as shown in FIG. 5, the light-emitting surface of each laser 12 includes a first light-emitting area 121, a second light-emitting area 122, and a third light-emitting area 123; the first light-emitting area 121 is used to emit the first color Light beam; the second light exit area 122 is used to emit the second color light beam; the third light exit area 123 is used to emit the third color light beam; the first color light beam, the second color light beam and the third color light beam are combined to form a white light beam. This structure is simple, and there is no need to provide a fluorescent wheel in the laser projection light source 1, so the volume of the laser projection light source 1 can be further reduced.

In the foregoing embodiment, the colors of the first color light beam, the second color light beam, and the third color light beam are not specifically limited, as long as the first color light beam, the second color light beam, and the third color light beam can be mixed to form white light. For example, as shown in FIG. 5, the first color light beam emitted by the first light exit area 121 is a blue light beam, the second color light beam emitted by the second light exit area 122 is a green light beam, and the third color light beam emitted by the third light exit area 123 The beam is a red beam. In another example, the first color light beam emitted from the first light exit area 121 is a cyan light beam, the second color light beam emitted from the second light exit area 122 is a yellow light beam, and the third color light beam emitted from the third light exit area 123 is magenta. Light beam.

The first light-emitting area 121, the second light-emitting area 122, and the third light-emitting area 123 can correspond to one lamp bead in the laser 12, can also correspond to a row of lamp beads in the laser 12, or can correspond to multiple rows of lamp beads in the laser 12 , There is no specific limitation here. In some embodiments, as shown in FIG. 5, the third light exit area 123 corresponds to two rows of lamp beads in the laser 12, and the first light exit area 121 and the second light exit area 122 both correspond to a row of lamp beads in the laser 12. Each row of lamp beads includes 6 lamp beads.

In some embodiments, a spherical lens 14 is installed in the light exit port, and the spherical lens 14 can condense the light beam entering the light exit port. In this way, the size of the optical element in the subsequent optical machine of the laser projection light source 1 (such as the light pipe 100 in FIG. 1 and FIG. 2) can be designed to be smaller, which is beneficial to reduce the size of the laser projection device.

There are various structural forms of the optical path assembly 13. As an example, the structure of the optical path assembly 13 may have the following two embodiments:

In the first embodiment, as shown in FIGS. 3 and 4, the optical path assembly 13 includes two light combining lens groups 131 and a reflector 132; the two light combining lens groups 131 are respectively used to emit a variety of colors from the two lasers 12 The two light combining lens groups 131 both emit light beams toward the reflector 132; the reflector 132 is used to change the transmission path of the emitted light beams of the two light combining lens groups 131, so that the two light combining lens groups The emitted light beam of 131 is emitted from the light outlet 112. In this way, the structure of the light path assembly 13 is simple, the cost is low, the volume of the laser projection light source is small, the structure complexity is low, and it is easy to implement.

In some embodiments, as shown in FIG. 5, the first light-emitting area 121, the second light-emitting area 122, and the third light-emitting area 123 of each laser 12 are all along a direction close to the reflector 132 (that is, as shown in FIGS. 3 and 4 in the direction X) are arranged in sequence; as shown in Figures 3 and 4, each combining lens group 131 includes a first reflective lens 1311, a second reflective lens 1312, and a third reflective lens 1313, the first reflective lens 1311 Located on the light exit side of the first light exit area 121 of the laser 12 corresponding to the light combining lens group 131, the first reflecting lens 1311 reflects the first color light beam emitted from the first light exit area 121, and the second reflecting lens 1312 is located in the light combining lens group 131 corresponds to the second light exit area 122 of the laser 12 and the light exit side of the first reflector 1311. The second reflector 1312 reflects the second color light beam from the second light exit area 122 and transmits the second light beam reflected by the first reflector 1311. One color light beam, the third reflecting lens 1313 is located at the third light exit area 123 of the laser 12 corresponding to the combining lens group 131, the first reflecting lens 1311 and the second reflecting lens 1312, the third reflecting lens 1313 reflects the third The third color light beam emitted from the light exit area 123 transmits the first color light beam reflected by the first mirror 1311 and the second color light beam reflected by the second mirror 1312; the first color beam reflected by the first mirror 1311 The optical axis of the color light beam, the optical axis of the second color light beam reflected by the second reflection lens 1312 and the optical axis of the third color light beam reflected by the third reflection lens 1313 are collinear. In this way, the light combining lens group 131 can combine the light of multiple colors emitted by the laser 12, which has a simple structure and a small footprint, which is beneficial to reduce the volume of the laser projection light source 1.

In the above-mentioned embodiment, it should be known that the optical axis of the first color light beam reflected by the first mirror 1311, the optical axis of the second color light beam reflected by the second mirror 1312, and the optical axis of the second color beam reflected by the second mirror 1312 are ensured. The optical axis of the third color light beam reflected by the lens 1313 is absolutely collinear, which is difficult to achieve in the actual processing and installation process of the laser projection light source 1. Therefore, for the first reflective lens 1311 described in the embodiment of the present application, the optical axis is absolutely collinear. The optical axis of the light beam of the first color, the optical axis of the light beam of the second color after being reflected by the second mirror 1312, and the optical axis of the light beam of the third color after being reflected by the third mirror 1313 are not only collinear. Understand as absolute collinear, should be understood as "collinear or nearly collinear". For example, the optical axis of the light beam of the first color after being reflected by the first mirror 1311, the optical axis of the light beam of the second color after being reflected by the second mirror 1312, and the optical axis of the light beam of the second color after being reflected by the third mirror 1313 described in the embodiment of the present application The collinear optical axis of the third color light beam refers to the optical axis of the first color light beam reflected by the first reflector 1311, the optical axis of the second color light beam reflected by the second reflector 1312 and the In the optical axis of the third color light beam reflected by the third reflecting lens 1313, the distance between any two optical axes is less than the first specific value, the angle between any two optical axes is less than the second specific value, and the first The specific value can be 1mm, 2mm, 3mm, etc., which are not specifically limited here, and the second specific value can be 1°, 2°, or 3°, etc., which are not specifically limited here.

The first reflection lens 1311 may be a total reflection mirror, a dichroic lens, or other structures, which is not specifically limited here. As an example, as shown in FIGS. 3 and 4, the first reflecting mirror 1311 is a total reflection mirror.

The second reflective lens 1312 and the third reflective lens 1313 may be dichroic lenses or other structures, which are not specifically limited here. In some embodiments, as shown in FIGS. 3 and 4, the second reflective glass 1312 and the third reflective glass 1313 are dichroic plates.

In some embodiments, as shown in FIG. 6, the distance between the first reflective glass 1311 and the first light-emitting area 121 on the central axis l1 of the first light-emitting area 121 is a first distance h1; The distance between the second light-emitting areas 122 on the central axis l2 of the second light-emitting area 122 is the second distance h2; the distance between the third reflective lens 1313 and the third light-emitting area 123 is on the central axis l3 of the third light-emitting area 123 The distance between is the third distance h3; the first distance h1, the second distance h2 and the third distance h3 are all 1 to 6 mm. In this way, the distance between the light combining lens group 131 and the laser 12 is moderate, which can reduce the size of the laser projection light source 1 in the direction perpendicular to the light-emitting surface of the laser 12, and avoid the gap between the light combining lens group 131 and the laser 12 The distance between, and the light combining lens group 131 and the laser 12 are collided and damaged during installation.

In the above-mentioned embodiment, it should be noted that, as shown in FIG. 6, the central axis 11 of the first light-emitting area 121 is an axis perpendicular to the light-emitting surface of the laser 12 and passing through the center of the first light-emitting area 121; The central axis 12 of 122 is the axis perpendicular to the light exit surface of the laser 12 and passes through the center of the second light exit area 122; the central axis 13 of the third light exit area 123 is perpendicular to the light exit surface of the laser 12 and passes through the third light exit area 123. The axis of the center.

The light emitted from the light-emitting surface of the laser 12 is emitted by a light-emitting device (that is, a lamp bead) inside the laser 12. Compared with light-emitting devices that emit lasers of other colors, the light-emitting devices that emit red light have a larger divergence angle. On this basis, in order to prevent the light beam emitted by the laser 12 from being reflected by the light combining lens group 131 and the reflector 132 and transmitted to the light outlet 112 from a large light spot, in some embodiments, as shown in FIG. 5, The light beam of the first color emitted from the first light exit area 121 is one of the blue light beam and the green light beam, and the light beam of the second color emitted from the second light exit area 122 is the other of the blue light beam and the green light beam. The third color light beam emitted from the area 123 is a red light beam. In this way, compared to the first color light beam emitted from the first light exit area 121 and the second color light beam emitted from the second light exit area 122, the third color light beam (that is, the red light beam) emitted from the third light exit area 123 is in the laser The transmission path between the light exit surface of 12 and the light exit 112 is short, and the light spot formed at the light exit 112 is small, which can prevent the light beam emitted by the laser 12 from being reflected by the light combining lens group 131 and the reflector 132 and transmitted to The light spot at the light exit 112 is too large, which is beneficial to reduce the diameter of the spherical lens installed in the light exit 112.

In some embodiments, as shown in FIG. 5, the polarization direction of the first color light beam emitted from the first light exit area 121 is the same as the polarization direction of the second color light beam emitted from the second light output area 122. The polarization direction of the second color light beam is perpendicular to the polarization direction of the third color light beam emitted from the third light exit area 123.

In the foregoing embodiment, in order to increase the uniformity of the light output of the laser projection light source 1, the following two optional implementation manners may be adopted:

In the first optional implementation manner, as shown in FIG. 6, a first wave plate 134 is provided between the third light exit area 123 and the third reflective lens 1313, and the first wave plate 134 is used to emit the third light exit area 123. The polarization direction of the third color light beam is rotated by 90°±10°. In this way, the polarization direction of the light beam emitted from the third light exit area 123 is changed by the first wave plate 134, so that the polarization direction of the light beam emitted from the third light output area 123 is the same as that of the light beam emitted from the first light output area 121 or the second light output area 122. The polarization direction remains the same, which can increase the uniformity of the light output of the laser projection light source 1.

In the second optional implementation manner, as shown in FIG. 7, a second wave plate is provided between the first light exit area 121 and the first reflective lens 1311, and a second wave plate is provided between the second light exit area 122 and the second reflective lens 1312. Three-wave plate, the second wave plate is used to rotate the polarization direction of the second color beam emitted from the first light-emitting area 121 by 90°±10°, and the third wave plate is used to rotate the third color light beam from the second light-emitting area 122 The polarization direction is rotated by 90°±10°. In this way, the polarization directions of the light beams emitted from the first light exit area 121 and the second light output area 122 are changed through the second wave plate and the third wave plate, respectively, so that the polarization of the light beams emitted from the first light output area 121 and the second light output area 122 is changed. The direction is consistent with the polarization direction of the light beam emitted from the third light-emitting area 123, which can increase the light-emitting uniformity of the laser projection light source 1.

In the foregoing embodiment, optionally, as shown in FIG. 7, the second wave plate and the third wave plate are integrally formed to form a structure 135. In this way, the number of parts included in the laser projection light source 1 is relatively small, and the structure complexity and assembly difficulty are relatively low.

In order to improve the uniformity of the output light beams of the multiple light combining lens groups 131 when synthesizing one light beam, in some embodiments, as shown in FIG. 4, a light homogenizing member 133 is provided on the light entrance side of the light exit 112. The homogenizing member 133 can improve the uniformity of the light beams from the multiple light combining lens groups 131 when synthesizing one light beam.

In some embodiments, the light homogenizing member 133 is a diffuser or a fisheye lens.

In the second embodiment, as shown in FIG. 8, the light path assembly 13 includes two light combining lens groups 131; the two light combining lens groups 131 are respectively used to combine the light of multiple colors emitted by the two lasers 12, and the two All the light combining lens groups 131 emit light beams toward the light outlet 112. In this way, the structure of the light path assembly 13 is simple, the cost is low, the volume of the laser projection light source is small, the structure complexity is low, and it is easy to implement.

In the second aspect, some embodiments of the present application provide a laser projection device, as shown in FIG. 9, comprising a laser projection light source 1, an optical engine 2, and a projection lens 3 connected in sequence. The laser projection light source 1 is the one in the above first aspect. The laser projection light source 1 and the optical machine 2 described in any embodiment are used to modulate the illumination beam emitted by the laser projection light source 1 to generate an image beam, and project the image beam to the projection lens 3, which is used to The image beam is used for imaging.

The laser projection device provided in the present application includes the laser projection light source 1 according to any one of the embodiments in the first aspect, so the laser projection device provided in the present application is the same as the laser projection device described in the foregoing embodiment. The light source 1 can solve the same technical problem and achieve the same expected effect.

In some embodiments, the laser projection device further includes a projection screen, the projection screen is arranged on the light exit path of the projection lens 3, and the projection light beams imaged by the projection lens 3 form a projection image on the projection screen.

In the description of this specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, All should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A laser projection light source, characterized in that it comprises:

A housing, the housing includes a first side wall and a second side wall opposite to each other, and a third side wall perpendicular to the first side wall and the second side wall, the first side wall and Each of the second side walls is provided with an accommodating opening, and the third side wall is provided with a light outlet;

Two lasers, the two lasers are respectively installed at the accommodating openings on the first side wall and the second side wall, each of the lasers emits light toward the inside of the housing, and each of the lasers The light-emitting surface of each includes a plurality of light-emitting areas, and the multiple light-emitting areas are used to emit light of multiple colors;

The optical path assembly, the optical path assembly is arranged in the housing, and the optical path assembly is used to combine the lights of multiple colors emitted by the two lasers respectively, and make the combined two beams face the The light exits.
The laser projection light source according to claim 1, wherein the light exit surface of each laser includes a first light exit area, a second light exit area, and a third light exit area;

The first light exit area is used to emit a first color light beam;

The second light exit area is used to emit a second color light beam;

The third light exit area is used to emit a third color light beam;

The first color light beam, the second color light beam, and the third color light beam are combined to form a white light beam.
The laser projection light source according to claim 2, wherein the optical path assembly includes two light combining lens groups and a reflector;

The two light combining lens groups are respectively used to combine light of multiple colors emitted by the two lasers, and the two light combining lens groups both emit light beams toward the reflector;

The reflector is used to change the transmission path of the outgoing light beams of the two light combining lens groups, so that the outgoing light beams of the two light combining lens groups are emitted from the light exit port.
The laser projection light source according to claim 3, wherein the first light exit area, the second light exit area, and the third light exit area of each of the lasers are all along a direction close to the reflector In sequence

Each of the light combining lens groups includes a first reflective lens, a second reflective lens, and a third reflective lens, and the first reflective lens is located on the light exit side of the first light exit area of the laser corresponding to the light combining lens group, The first reflecting lens reflects the first color light beam emitted from the first light exit area, and the second reflecting lens is located at the second light exit area of the laser corresponding to the light combining lens group and the light output of the first reflecting lens On the other hand, the second reflecting lens reflects the second color light beam emitted from the second light exit area and transmits the first color light beam reflected by the first reflecting lens, and the third reflecting lens is located in the combining lens The third light-emitting area of the corresponding group of lasers, the light-emitting side of the first reflector and the second reflector, the third reflector reflects the third color light beam emitted from the third light-emitting area and transmits through all The first color light beam reflected by the first reflecting lens and the second color light beam reflected by the second reflecting lens;

The optical axis of the light beam of the first color after being reflected by the first reflector, the optical axis of the light beam of the second color after being reflected by the second reflector, and the light of the third color after being reflected by the third reflector The optical axis is collinear.
4. The laser projection light source according to claim 4, wherein the distance between the first reflecting mirror and the first light-emitting area on the central axis of the first light-emitting area is a first distance;

The distance between the second reflecting mirror and the second light-emitting area on the central axis of the second light-emitting area is a second distance;

The distance between the third reflecting mirror and the third light-emitting area on the central axis of the third light-emitting area is a third distance;

The first distance, the second distance, and the third distance are all 1 to 6 mm.
The laser projection light source according to claim 4 or 5, wherein the first color light beam emitted from the first light exit area is one of a blue light beam and a green light beam, and the first color light beam emitted from the second light exit area The two-color light beam is the other of the blue light beam and the green light beam, and the third color light beam emitted from the third light exit area is a red light beam.
The laser projection light source according to claim 4 or 5, wherein the polarization direction of the first color light beam emitted from the first light exit area is the same as the polarization direction of the second color light beam emitted from the second light output area. The polarization direction of the second color light beam emitted from the second light exit area is perpendicular to the polarization direction of the third color light beam emitted from the third light output area;

A first wave plate is provided between the third light exit area and the third reflecting mirror, and the first wave plate is used to rotate the polarization direction of the third color light beam emitted from the third light exit area by 90° ±10°.
The laser projection light source according to claim 4 or 5, wherein the polarization direction of the first color light beam emitted from the first light exit area is the same as the polarization direction of the second color light beam emitted from the second light output area. The polarization direction of the second color light beam emitted from the second light exit area is perpendicular to the polarization direction of the third color light beam emitted from the third light output area;

A second wave plate is arranged between the first light exit area and the first reflecting mirror, a third wave plate is arranged between the second light exit area and the second reflecting mirror, and the second wave plate Used to rotate the polarization direction of the first color light beam emitted from the first light exit area by 90°±10°, and the third wave plate is used to rotate the polarization direction of the second color light beam emitted from the second light output area 90°±10°.
The laser projection light source according to any one of claims 1 to 5, wherein a light homogenizing member is provided on the light entrance side of the light exit port.
A laser projection device, characterized by comprising a laser projection light source, an optical machine and a projection lens connected in sequence, the laser projection light source being the laser projection light source according to any one of claims 1-9, and the optical machine It is configured to modulate the illumination light beam emitted by the laser projection light source to generate an image light beam, and project the image light beam to the projection lens, and the projection lens is configured to image the image light beam.