CN114527578A

CN114527578A - Projection light source and projection equipment

Info

Publication number: CN114527578A
Application number: CN202210337016.6A
Authority: CN
Inventors: 李巍; 顾晓强; 田有良
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-05-24

Abstract

The application discloses projection light source and projection equipment belongs to the photoelectric technology field. The first laser and the second laser in the projection light source are sequentially arranged along a first direction, and the first light combining mirror and the second light combining mirror are sequentially arranged along the first direction; in the first laser and the second laser, the emergent area of the first laser and the emergent area of the second laser are both parallel to a first direction; laser emitted by the first laser device is emitted to the first light combining mirror, and the first light combining mirror is used for reflecting the emitted laser to the second light combining mirror along the first direction; the laser emitted by the second laser device is emitted to the second light combining mirror, and the second light combining mirror is used for reflecting the laser emitted by the second laser device along the first direction and transmitting the laser emitted by the first light combining mirror along the first direction. The method and the device solve the problem that the display effect of the projection picture formed by the laser emitted by the projection light source is poor. The application is used for light emission.

Description

Projection light source and projection equipment

Technical Field

The application relates to the field of photoelectric technology, in particular to a projection light source and projection equipment.

Background

With the development of the electro-optical technology, the projection device is widely used, and the requirement for the display effect of the projection image is higher and higher.

The projection light source in the projection device can emit laser light with various colors, and then the projection picture is formed based on the laser light projection. In the related art, the projection light source may include a laser and a light combining lens, and the light combining lens may mix laser lights of different colors emitted from the laser and emit the mixed laser lights. And then the laser can be emitted to a subsequent modulation light path to be emitted after modulating the laser based on the picture to be projected, so that the display of the projected picture is realized.

However, the display effect of the projection screen formed based on the laser light emitted from the projection light source in the related art is poor.

Disclosure of Invention

The application provides a projection light source and projection equipment, which can solve the problem of poor display effect of a projection picture. The technical scheme comprises the following steps:

in one aspect, a projection light source is provided, the projection light source comprising: the laser comprises a first laser, a second laser, a first light combining mirror and a second light combining mirror; the first laser and the second laser are sequentially arranged along a first direction, and the first light combining mirror and the second light combining mirror are sequentially arranged along the first direction;

the first laser and the second laser are both used for emitting first laser and second laser with different colors; in the first laser and the second laser, the emitting area of the first laser and the emitting area of the second laser are both parallel to the first direction;

the laser emitted by the first laser device is emitted to the first light combining mirror, and the first light combining mirror is used for reflecting the emitted laser to the second light combining mirror along the first direction; the laser emitted by the second laser is emitted to the second light combining mirror, and the second light combining mirror is used for reflecting the laser emitted by the second laser along the first direction and transmitting the laser emitted by the first light combining mirror along the first direction.

In another aspect, a projection apparatus is provided, the projection apparatus comprising: the projection light source, the light valve and the lens;

the projection light source is used for emitting laser to the light valve, the light valve is used for modulating the emitted laser and then emitting the modulated laser to the lens, and the lens is used for projecting the emitted laser to form a projection picture.

The beneficial effect that technical scheme that this application provided brought includes at least:

in this application, the projection light source can include a plurality of lasers, and then the projection light source can send the laser of higher luminance, and the display brightness of the projection picture based on this laser formation is higher, carries out the display effect that can improve the projection picture. And the first light combining mirror and the second light combining mirror can mix and emit the laser light emitted by the first laser and the second laser along the arrangement direction of the two lasers. The length-width ratio of the light spot formed by the mixed laser can be smaller, the requirements of light receiving and laser projection are better met, the laser utilization rate can be improved, and the display effect of a projection picture formed based on the laser is better.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection light source provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of another projection light source provided in an embodiment of the present application;

FIG. 3 is a schematic diagram of a light spot formed by laser emitted from a projection light source according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of another projection light source provided in an embodiment of the present application;

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

fig. 6 is a schematic structural diagram of a laser provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of another laser provided in an embodiment of the present application;

FIG. 8 is a schematic diagram of a projection light source according to another embodiment of the present disclosure;

FIG. 9 is a schematic diagram of another projection light source according to another embodiment of the present disclosure;

FIG. 10 is a schematic diagram of another projection light source according to another embodiment of the present disclosure;

FIG. 11 is a schematic diagram of a spot formed by laser light emitted from a projection light source provided by the related art;

FIG. 12 is a schematic diagram of another projection light source according to another embodiment of the present disclosure;

FIG. 13 is a schematic diagram of a projection light source according to still another embodiment of the present application;

FIG. 14 is a schematic diagram of another projection light source according to another embodiment of the present disclosure;

FIG. 15 is a schematic diagram of a projection light source according to another embodiment of the present application;

FIG. 16 is a schematic diagram of a projection light source according to still another embodiment of the present application;

fig. 17 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

With the development of the photoelectric technology, the application of the projection device is more and more extensive, and the requirement for the display effect of the projection picture projected by the projection device is higher and higher. The embodiment of the application provides a projection light source and projection equipment, the brightness of the laser emitted by the projection light source is higher, the symmetry of the laser with various colors is higher, the light mixing effect is better, and a projection picture with a better display effect can be formed.

Fig. 1 is a schematic structural diagram of a projection light source provided in an embodiment of the present application, and fig. 2 is a schematic structural diagram of another projection light source provided in an embodiment of the present application. Fig. 1 may be a front view of the projection light source shown in fig. 2, and fig. 2 may be a top view of the projection light source shown in fig. 1. As shown in fig. 1 and 2, the projection light source 10 may include a first laser 101, a second laser 102, a first combiner 103, and a second combiner 104.

The first laser 101 and the second laser 102 may be arranged in sequence along a first direction, for example, the first direction is an x direction in the figure. The first laser 101 and the second laser 102 are both multi-color lasers. The first laser 101 and the second laser 102 are both used for laser light in a third direction (e.g., z direction in the figure). Each laser may emit first and second laser light of different colors, which are emitted from different regions in the laser. The emitting area of the first laser light and the emitting area of the second laser light in each laser are also parallel to the first direction. The first direction is perpendicular to the third direction.

The first light combining mirror 103 is located at the light emitting side of the first laser 101, the second light combining mirror 104 is located at the light emitting side of the second laser 102, and the first light combining mirror 103 and the second light combining mirror 104 are also sequentially arranged along the first direction. The laser light emitted by the first laser 101 is emitted to the first light combining mirror 103, and the first laser light and the second laser light are emitted to different areas in the first light combining mirror 103, and the first light combining mirror 103 can reflect the emitted laser light to the second light combining mirror 104 along a first direction. The laser light from the second laser 102 may be directed to the second combiner 104, and the first laser light and the second laser light may be directed to different areas in the first combiner 103. The second light-combining mirror 104 is a dichroic mirror. The second light combiner 104 may reflect the laser light emitted from the second laser 102 in the first direction and may transmit the laser light emitted from the first light combiner 103 in the first direction.

Optionally, the first light combining mirror 103 may be a reflecting mirror for a full wavelength band, or may also be a dichroic mirror, and it is only necessary to ensure that the first light combining mirror 103 can reflect the first laser light and the second laser light, and the reflection performance of the laser light of other colors is not considered.

Fig. 3 is a schematic diagram of a spot formed by laser light emitted from a projection light source according to an embodiment of the present disclosure.

Wherein spot G1 may be a spot formed by the first laser and spots G2 and G3 may be spots formed by the second laser. As shown in fig. 3, the length and width of the whole spot formed by mixing the laser beams emitted by the two lasers in the projection light source 10 are relatively small. The second laser may include two different colored lasers and spot G2 and spot G3 may be spots formed by the two lasers, respectively.

After the laser emitted by the laser 101 is mixed by the light combining mirror, the mixed laser needs to be injected into the light homogenizing part for homogenization, and then subsequent laser modulation and projection are performed. The higher the matching degree of the light spot formed by the laser emitted by the light combining mirror and the light homogenizing component is, the higher the utilization rate of the laser is, and the better the homogenized effect is. The matching of the light spot and the light homogenizing part can mean the matching of the shape of the light spot and the shape of the light incident surface of the light homogenizing part or the matching of the shape of the light incident port of the light homogenizing part. The length-width ratio of the light inlet of the light homogenizing part is small, and can be 16: 9. As can be seen from fig. 3, the aspect ratio of the spot formed by the laser light emitted from the light combining mirror in the embodiment of the present application is small, and the matching degree of the spot and the light uniformizing component is high. Therefore, the utilization rate of the laser emitted by the projection light source can be higher, the homogenization effect of the dodging component on the laser is better, and the display effect of a projection picture formed based on the laser can be better.

To sum up, in this application embodiment, the projection light source can include a plurality of lasers, and then the projection light source can send the laser of higher luminance, and the display luminance of the projection picture based on this laser formation is higher, carries out the display effect that can improve the projection picture. And the first light combining mirror and the second light combining mirror can mix and emit the laser light emitted by the first laser and the second laser along the arrangement direction of the two lasers. The length-width ratio of the light spot formed by the mixed laser can be smaller, the requirements of light receiving and laser projection are better met, the laser utilization rate can be improved, and the display effect of a projection picture formed based on the laser is better.

Optionally, the orthographic projections of the first light combining mirror 103 and the second light combining mirror 104 at least partially coincide on a reference plane perpendicular to the first direction. It should be noted that the reference plane described in this application is only an imaginary plane for describing the relationship between the position and size of each device, and may not be a plane actually existing in the projection light source. In the second light combining mirror 104, the irradiation region of the first laser beam emitted from the second laser 102 and the irradiation region of the second laser beam emitted from the first light combining mirror 103 at least partially overlap each other, and the irradiation region of the second laser beam emitted from the second laser 102 and the irradiation region of the first laser beam emitted from the first light combining mirror 103 at least partially overlap each other. If the first combiner 103 and the second combiner 104 have the same size, the orthographic projections of the two combiners on the reference plane can be completely overlapped.

Referring to fig. 2, the first laser beam emitted by the first laser 101 is emitted to a first area (not shown) in the first combiner 103, and the second laser beam emitted by the first laser 101 is emitted to a second area (not shown) in the first combiner 103. The first laser beam emitted by the second laser 102 is directed to a third area (not shown) in the second beam combiner 104, and the second laser beam reflected by the second area is also directed to the third area. The third region is used for reflecting the first laser and transmitting the second laser, and then the incident laser can be emitted along the first direction. The second laser beam emitted by the second laser 102 is directed to a fourth area (not shown) in the second beam combiner 104, and the first laser beam reflected by the first area is also directed to the fourth area. The fourth area is used for reflecting the second laser and transmitting the first laser, and then the incident laser can be emitted along the first direction. On a reference plane perpendicular to the first direction, the first region at least partially coincides with an orthographic projection of the fourth region, and the second region at least partially coincides with an orthographic projection of the third region.

Alternatively, the orthographic projection of the first light combining mirror 103 may be located outside the orthographic projection of the second light combining mirror 104 on a reference plane perpendicular to the first direction. In this case, the transmission paths of the laser beams emitted from the first and

second beam combiners

103 and 104 do not overlap. The first combiner 103 and the second combiner 104 may be both mirrors for a full band. Optionally, on the reference plane, an orthogonal projection of the first region in the first combiner 103 and the fourth region in the second combiner 104 coincide, and an orthogonal projection of the second region in the first combiner 103 is located outside an orthogonal projection of the third region in the second combiner 104.

In an alternative implementation of the light combining mirror, as shown in fig. 1 and fig. 2, the first light combining mirror 103 and the second light combining mirror 104 are both a one-piece lens. In this manner, the emitting regions of the first laser and the second laser in the first laser 101 may be sequentially arranged along the first direction, and the emitting regions of the first laser and the second laser in the second laser 102 are sequentially arranged along the opposite direction of the first direction. If the first direction is the x direction, the emission manner of the laser in the projection light source may be as shown in fig. 1. Optionally, the first direction may also be the opposite direction of the x direction, and the emitting areas of different lasers in the laser may be changed accordingly.

In this alternative, the mirror surfaces of the first light combining mirror 103 and the second light combining mirror 104 may be parallel to each other. In this optional implementation manner, only two light combining mirrors are arranged on the light emitting sides of the first laser 101 and the second laser 102, so that light combining of laser light emitted by the two lasers can be realized, and the structure of the projection light source is simpler.

In another alternative implementation of the light combining mirror, the first light combining mirror 103 and the second light combining mirror 104 may include a plurality of independent sub-mirror pieces. The transflective characteristics of the laser light may be different for different sub-lenses. Fig. 4 is a schematic structural diagram of another projection light source provided in an embodiment of the present application. As shown in fig. 4, the first combiner 103 may include a first sub-optic J1 and a second sub-optic J2, and the second combiner 104 includes a third sub-optic J3 and a fourth sub-optic J4. On the first laser 101, the orthographic projection of the first sub-lens J1 may cover the exit area of the first laser light, and the orthographic projection of the second sub-lens J2 may cover the exit area of the second laser light. On the second laser, the orthographic projection of the third sub-mirror J3 may cover the exit area of the first laser light, and the orthographic projection of the fourth sub-mirror J4 may cover the exit area of the second laser light. On a reference plane perpendicular to the first direction, the orthographic projection of the first sub-mirror J1 is located outside the orthographic projection of the second sub-mirror J2, and the orthographic projection of the third sub-mirror J3 is located outside the orthographic projection of the fourth sub-mirror J4. The orthographic projection of the first sub-lens J1 and the fourth sub-lens J4 at least partially coincide, and the orthographic projection of the second sub-lens J2 and the third sub-lens J3 at least partially coincide.

The first laser beam emitted from the first laser 101 may be directed to the first sub-mirror J1, and the second laser beam emitted from the first laser may be directed to the second sub-mirror J2. The first laser beam emitted from the second laser 102 is directed to the third sub-mirror J3, and the second laser beam emitted from the second laser is directed to the fourth sub-mirror J4. The first sub-mirror J1 is used for reflecting the incident first laser light to the third sub-mirror J3 in the first direction, and the second sub-mirror J2 is used for reflecting the incident second laser light to the fourth sub-mirror J4 in the first direction. The third sub-mirror J3 and the fourth sub-mirror J4 are both dichroic mirrors. The third sub-mirror J3 is used for transmitting the first laser beam and reflecting the second laser beam along the first direction, and the fourth sub-mirror J4 is used for transmitting the second laser beam and reflecting the first laser beam along the first direction. This alternative implementation can be seen as dividing the entire light combining mirror in fig. 1 into a plurality of independent mirrors according to the difference of the incident laser light.

In this optional implementation manner, the arrangement directions of the emission regions of different lasers in the laser can be flexibly set. Exemplarily, fig. 5 is a schematic structural diagram of another projection light source provided in an embodiment of the present application. As shown in fig. 5, the emitting regions of the first laser beam and the second laser beam in the first laser 101 may be sequentially arranged along the first direction, and the emitting regions of the first laser beam and the second laser beam in the second laser 102 may also be sequentially arranged along the first direction.

In this optional implementation manner, no matter how the emitting areas of the first laser and the second laser are arranged, the mixed emission of the lasers emitted by the two lasers can be realized by adjusting the corresponding sub-lenses. For example, the mirror surfaces of the sub-mirrors in the first light combining mirror 103 and the second light combining mirror 104 are parallel, and it is only necessary to ensure that the distance from the first sub-mirror J1 to the first laser 101 is the same as the distance from the fourth sub-mirror J4 to the second laser 102, and the distance from the second sub-mirror J2 to the first laser 101 is the same as the distance from the third sub-mirror J3 to the second laser 102. The distance of the lens from the laser may refer to the distance between the center of the lens and the laser in the third direction.

Alternatively, the first light combiner 103 and the second light combiner 104 may be parallel and both disposed obliquely. The included angle between the first light combining mirror 103 and the first direction and the included angle between the first light combining mirror 103 and the third direction can be 45 degrees, so as to perform 90-degree turning on the transmission direction of the incident laser. When the first light combiner 103 and the second light combiner 104 include a plurality of sub-lenses, the sub-lenses may be parallel and both may be disposed obliquely.

The laser 101 in the projection light source 10 will be described with reference to the drawings. In this embodiment, the first laser 101 and the second laser 102 may be the same laser, and details of the structure of the second laser 102 are not repeated in this embodiment.

In the embodiment of the present application, the first laser light and the second laser light emitted by the first laser 101 are different in color. The first laser and the second laser may both be lasers of one color, or at least one of the first laser and the second laser satisfies that the lasers include lasers of multiple colors. The following description will be given by taking an example in which the first laser is a laser of one color, the second laser includes a laser of the first color and a laser of the second color, the first laser is a red laser, the laser of the first color is a blue laser, and the laser of the second color is a green laser. Alternatively, the first laser may also include lasers of multiple colors. The laser of the first color may be green laser, and the laser of the second color may be blue laser; alternatively, the laser light of the first color or the laser light of the second color may be yellow laser light or laser light of another color.

Fig. 6 is a schematic structural diagram of a laser according to an embodiment of the present disclosure. Fig. 7 is a schematic structural diagram of another laser provided in an embodiment of the present application. Fig. 6 may be a top view of the laser shown in fig. 7, and fig. 7 may be a schematic view of section a-a' in the laser shown in fig. 6. As shown in fig. 6, the emission region of the second laser light in the laser 101 may include a first light emission region Q1 and a second light emission region Q2, the first light emission region Q1 is used for emitting laser light of the first color, and the second light emission region Q2 is used for emitting laser light of the second color. The first light exiting region Q1 and the second light exiting region Q2 may be sequentially arranged along a second direction (e.g., y direction) perpendicular to the first direction and perpendicular to the third direction. The emission region of the first laser light may be a region Q3 in fig. 6, and this region Q3 is hereinafter referred to as a third light extraction region.

Referring to fig. 1 to 7, the laser 101 may include a base 1011 and two light emitting modules (not shown). One of the light emitting modules is used for emitting first laser, and the light emitting module comprises a third light emitting area Q3; the other light-emitting module is used for emitting second laser light and comprises a first light-emitting area Q1 and a second light-emitting area Q2. The orthographic projection of a device (such as a light modulation mirror or a light combination mirror) on the laser 101 in the embodiment of the present application may refer to the orthographic projection of the device on the base 1011 of the laser 101.

The two light emitting modules are both located on the bottom plate 1011, and the two light emitting modules can be sequentially arranged along a first direction. Each light emitting module may include a ring-shaped pipe wall 1012 and a plurality of light emitting chips 1013 surrounded by the pipe wall 1012. Alternatively, each light emitting module may have an elongated shape, and an orthographic projection of each light emitting module on the base plate 1011 may have a substantially rectangular shape. The length direction of the rectangle may be parallel to the second direction, and the width direction may be parallel to the first direction.

As shown in fig. 6, the plurality of light emitting chips 1013 in each light emitting module may be arranged in at least one row in the first direction. In the embodiment of the application, the plurality of light emitting chips are only arranged in one row; optionally, the plurality of light emitting chips may also be arranged in multiple rows, such as two rows or three rows, which is not limited in the embodiment of the present application. Alternatively, the slow axes of the laser lights emitted from the plurality of light emitting chips 1013 in each light emitting module may be all parallel to the first direction.

It should be noted that the transmission speeds of the laser in different light vector directions may differ, the light vector direction with the fast transmission speed is a fast axis, the light vector direction with the slow transmission speed is a slow axis, and the fast axis is perpendicular to the slow axis. The fast axis can be perpendicular to the surface of the light emitting chip 1013 and the slow axis is parallel to the surface of the light emitting chip 1013, e.g., the fast axis is the z-direction and the slow axis is the y-direction. The divergence angle of the laser light in the fast axis is larger than the divergence angle in the slow axis, e.g., the divergence angle in the fast axis is substantially more than 3 times the divergence angle in the slow axis. The light emitting chips 1013 are arranged with the slow axis of the emitted laser light as the arrangement direction. Since the divergence angle of the laser light in this direction is small, the distance between the light emitting chips 1013 can be small and the arrangement density of the light emitting chips 1013 can be large while avoiding the interference and overlapping of the laser light emitted from the adjacent light emitting chips 1013, which is beneficial to the miniaturization of the laser. Optionally, the plurality of light emitting chips 1013 in the light emitting module may also be arranged in an array, and arranged in multiple rows and multiple columns, which is not limited in the embodiment of the present application.

Each light module may further include a set of collimating mirrors 1014, a plurality of heat sinks 1015, a plurality of reflective prisms 1016, and a light transmissive encapsulant 1018. The plurality of heat sinks 1015 and the plurality of reflection prisms 1016 may each correspond to the plurality of light emitting chips 1013 in the light emitting module one to one. Each light emitting chip 1013 is positioned on a corresponding heat sink 1015, and the heat sink 1015 is used to assist the heat dissipation of the corresponding light emitting chip 1013. The material of the heat sink 1015 may include ceramic. Each reflecting prism 1016 is located at the light exit side of the corresponding light emitting chip 1013. Light transmissive sealing layer 1018 is positioned on the side of tube wall 1012 remote from base 1011 to seal the opening in the side of tube wall 1012 remote from base 1011 to form a sealed space with base 1011 and tube wall 1012. Alternatively, the laser 101 may not include the light transmissive sealing 1018, but may be directly attached to the surface of the tube wall 1012 remote from the base 1011 by the collimating mirror assembly 1014. Thus, the collimating lens assembly 1014, the tube wall 1012 and the base plate 1011 together form a sealed space.

The collimating mirror array 1014 is located on the side of the light transmissive encapsulant 1018 remote from the base 1011. The collimating lens group 1014 includes a plurality of collimating lenses (not shown) corresponding to the plurality of light emitting chips 1013 one to one. In the present embodiment, the collimating lenses in each collimating lens group 1014 can be integrally formed. Illustratively, the collimator lens group 1014 has a substantially plate shape, and a surface of the collimator lens group 1014 close to the base plate 1011 is a plane, and a surface far from the base plate 1011 has a plurality of convex arc surfaces, and a portion of each of the plurality of convex arc surfaces is a collimator lens.

The light emitting chips 1013 may emit laser light to the corresponding reflecting prisms 1016, and the reflecting prisms 1016 may reflect the laser light to the collimating lenses corresponding to the light emitting chips 1013 in the collimating lens group 1014 along a direction (e.g., z direction) away from the base plate 1011, so that the laser light may be collimated by the collimating lenses and then emitted. It should be noted that, after the laser light emitted from the light emitting chip 1013 is adjusted by the collimating lens, the divergence angle of the laser light on the fast axis may be smaller than that on the slow axis.

It should be noted that the light emitting chips may be divided according to light emitting colors, each type of light emitting chip may emit laser light of one color, and different types of light emitting chips are used for emitting laser light of different colors. In the embodiment of the present application, different light emitting modules in the laser 101 may include different types of light emitting chips. Each light emitting module may include only one type of light emitting chip, or there may be a plurality of types of light emitting chips included in the light emitting module.

For example, as shown in fig. 6 and 7, the laser 101 may include a first light emitting module and a second light emitting module, the first light emitting module may be the light emitting module located on the left side in fig. 6, and the second light emitting module may be the light emitting module located on the right side in fig. 6. The first light emitting module may include a plurality of first type light emitting chips 1013a, and the second light emitting module may include a plurality of second type light emitting chips 1013b and a plurality of third type light emitting chips 1013 c. The wavelengths of the laser light emitted from the first type 1013a, the second type 1013b, and the third type 1013c decrease in sequence. For example, the first type 1013a, the second type 1013b, and the third type 1013c of the light emitting chip are configured to emit red laser light, blue laser light, and green laser light. That is, the first laser is a red laser, the second laser is a blue laser, and the third laser is a green laser. The laser light emitted by the three types of light emitting chips may also be in other colors, for example, the third type of light emitting chip 1013b is used for emitting yellow laser light, and the embodiment of the present application is not limited.

In the embodiment of the present application, the number of the first type of light emitting chips 1013a in the first light emitting module is 4, the number of the second type of light emitting chips 1013b in the second light emitting module is 3, and the number of the third type of light emitting chips 1013c is 2. The number of the three types of light emitting chips may also be adjusted accordingly according to the requirement, for example, the number of the first type of light emitting chips 1013a may also be 5 or another value, the number of the second type of light emitting chips 1013b may also be 4 or another value, and the number of the third type of light emitting chips 1013c may also be 3 or another value, which is not limited in the embodiment of the present application.

Alternatively, the laser 101 may also comprise only one tube wall 1012, as in the laser shown in fig. 1. The plurality of light emitting chips 1013 in the laser 101 may be arranged in a plurality of rows and columns in the one tube wall 1012. The arrangement of the plurality of light emitting chips 1013 may be the same as the arrangement of the light emitting chips 1013 in fig. 6 and 7, and details are not repeated in this embodiment of the application. In the laser 101, each light-emitting area is an area where each light-emitting chip is located.

The above description takes the example that the laser emitted from each laser directly emits to the corresponding light-combining mirror. Optionally, for the lasers shown in fig. 6 and 7, the projection light source 10 may further include a dimming mirror group located between the laser and the corresponding light combining mirror. For a laser device in which the emitted first laser light and the emitted second laser light are only laser light of one color, the projection light source may not be provided with the light adjusting lens group.

Fig. 8 is a schematic structural diagram of a projection light source according to another embodiment of the present application, fig. 9 is a schematic structural diagram of another projection light source according to another embodiment of the present application, and fig. 10 is a schematic structural diagram of another projection light source according to another embodiment of the present application. Fig. 9 may be a right side view of the projection light source shown in fig. 8, and fig. 10 may be a top view of the projection light source shown in fig. 8. As shown in fig. 8 to 10, the projection light source 10 may include a dimming mirror group between the laser and the light combining mirror, and the dimming mirror group includes a first dimming mirror 105 and a second dimming mirror 106 sequentially arranged along the second direction. The two light adjusting mirrors can be both in a strip shape, and the length direction of the light adjusting mirrors is parallel to the first direction. The first dimming mirror 105 and the second dimming mirror 106 are located between the first laser 101 and the first light combining mirror 103, and between the second laser 102 and the second light combining mirror 104.

Optionally, the first dimming mirror 105 may include two sub-lenses, one sub-lens is located between the first laser 101 and the first light combining mirror 103, and the other sub-lens is located between the second laser 102 and the second light combining mirror 104. The second dimming mirror 106 may also include two sub-lenses, one sub-lens is located between the first laser 101 and the first combiner 103, and the other sub-lens is located between the second laser 102 and the second combiner 104. This kind of mode is not illustrated in this application embodiment, and the transmission mode of laser is the same in the projection light source under this kind of mode is the same with the projection light source that sets up monoblock light adjusting mirror, and concrete structure can analogize based on the projection light source that sets up monoblock light adjusting mirror.

As shown in fig. 8 to 10, the orthographic projection of the first dimming mirror 105 on each laser covers a partial area in the emission area of the first laser light, such as the partial area being referred to as a first sub-area. The orthographic projection of the first dimming mirror 105 also covers a partial region of the first light exit area Q1, which is referred to as a second sub-area, for example. The orthographic projection of the second light adjusting mirror 106 on the laser is positioned on the side of the second light emergent area Q2 away from the first light emergent area Q1. Part of the first laser light emitted by the laser and part of the laser light emitted by the first light emitting area Q1 may be emitted to the first light modulation mirror 105, and for example, the laser light emitted by the first sub-area and the second sub-area may be emitted to the first light modulation mirror 105. The first light modulation mirror 105 may reflect the incident laser light in the second direction to the second light modulation mirror 106, and the second light modulation mirror 106 may reflect the incident laser light to the first light combining mirror 103 and the second light combining mirror 104. Specifically, the second light modulation mirror 106 reflects the laser light from the first laser 101 toward the first light combining mirror 103, and reflects the laser light from the second laser 102 toward the second light combining mirror 104.

For example, the first sub-region may be a region where a portion of the first type light emitting chip 1013a located at one end in the first light emitting module of the laser is located. The second sub-region may be a region where a part of the second type light emitting chip 1013b at the one end of the second light emitting module is located. The first sub-region is aligned with the second sub-region in a first direction. For example, the first subregion is aligned in the first direction with one end of the second subregion near the other region in the light emergent region. The areas of the first sub-area and the second sub-area may be equal or may not be equal, and the embodiment of the present application is not limited.

Alternatively, the second sub-regions may be half the area of the first light exit region Q1, or the second sub-regions may be slightly larger or smaller than half the area of the first light exit region Q1. The size of the first sub-area may be set accordingly based on the size of the second sub-area. In this way, the laser light of the first color emitted by the first light emitting area Q1 can be equally divided into two parts, so that the two parts of laser light are respectively located at two sides of the laser light of the second color when the two parts of laser light irradiate the light combining mirror, and the highest symmetry of the laser light of the first color can be ensured. Illustratively, in the embodiment of the present application, the first light exiting area Q1 includes two second light emitting chips 1013b, and the second sub-area may be an area where the second light emitting chip 1013b far from the third light emitting chip 1013c is located. Accordingly, the first sub-region may be a region where one second type light emitting chip 1013b is located. The sizes of the first sub-area and the second sub-area can be correspondingly adjusted according to the number and the arrangement of various light-emitting chips, and the embodiment of the application is not limited.

In this embodiment, the light adjusting lens group can adjust the laser light emitted from the first sub-region and the second sub-region to emit from the side of the second light emitting region Q2 far away from the first light emitting region Q1 to the light combining lens. This allows the laser light of the first color emitted from the first light exiting region Q1 to be divided into two parts. The two laser beams are positioned on both sides of the laser beam of the second color emitted from the second light emitting area Q2. On the light combining mirror, the spots formed by the two laser beams are respectively positioned on two sides of the spot formed by the laser beam emitted by the second light emitting area Q2. Therefore, the symmetry situation of the laser of the first color and the laser of the second color can be ensured to be more similar. For example, the center of the beam formed by the laser light of the first color and the center of the beam formed by the laser light of the second color may be close to or even coincide with each other. And then the difference of incident angles when the laser of the first color and the laser of the second color are injected into the subsequent light homogenizing part can be smaller, the homogenization effect consistency of the light homogenizing part on the laser of the two colors can be better, and the laser of the two colors can be better.

When adjusting the second laser light, the light adjusting lens group 102 also adjusts a part of the first laser light at one end to the other end. Therefore, the irradiation position of the first laser in the light combining lens is ensured to have smaller deviation with the irradiation position of the second laser. After the incident laser light is emitted along the first direction by the first light combining mirror 103 and the second light combining mirror 104, the symmetry of the laser light of each color with respect to the main optical axis of the projection light source is good, the centers of the laser light of different colors can be close to or even coincide with each other, and the light mixing effect of the laser light of each color emitted by the projection light source can be guaranteed to be good.

The divergence angle of the red laser light emitted by the laser is larger than the divergence angles of the green laser light and the blue laser light. That is, the divergence angle of the laser light emitted from the third light exit region Q3 of the laser 101 is larger than the divergence angles of the laser light emitted from the first light exit region Q1 and the second light exit region Q2. The difference between the spot area of the red laser and the spot areas of the green laser and the blue laser will be larger and larger when transmitted at the divergence angle. Fig. 11 is a schematic diagram of a spot formed by laser light emitted from a projection light source provided in the related art. As shown in fig. 11, the area of the red spot in the related art is much larger than the areas of the green and red spots. Therefore, the mixing effect of the laser beams with different colors is poor, which is not favorable for forming the subsequent projection picture.

The embodiment of the application can also improve on the basis of the projection light source, so that the divergence angle difference of the laser with different colors emitted by the projection light source is smaller, the light mixing effect of the laser with different colors is further improved, and the display effect of a projection picture formed based on the laser is improved.

In the embodiment of the application, a component for adjusting the divergence angle of the laser can be arranged between the laser and the light combining mirror for emitting the laser, so that the divergence angle of the laser emitting different colors to the light combining mirror is ensured to be closer, and the consistency of light spots of the laser emitting different colors after light combination in the transmission process is ensured to be higher.

In an alternative implementation manner, fig. 12 is a schematic structural diagram of another projection light source provided in another embodiment of the present application. As shown in fig. 12, the projection light source 10 may further include: a fly-eye lens 107. Fly eye lenses 107 may be located between the lasers and the combiner, such as between the first laser 101 and the first combiner 103, and between the second laser 102 and the second combiner 104. The orthographic projection of the fly eye lens 107 on the laser covers the first light emitting area Q1, the second light emitting area Q2 and the third light emitting area Q3, and laser light emitted by the laser can be homogenized by the fly eye lens 107 and then emitted to the light combiner.

Illustratively, the projection light source 10 may include only one fly-eye lens 107, and the fly-eye lens 107 is simultaneously located between the first laser 101 and the first combiner 103, and between the second laser 102 and the second combiner 104. Optionally, the projection light source 10 may also include two fly-eye lenses 107, where one fly-eye lens 107 is located between the first laser 101 and the first light combining mirror 103, and the other fly-eye lens 107 is located between the second laser 102 and the second light combining mirror 104, and this way is taken as an example in this embodiment of the present application to illustrate. The laser light emitted by each laser is homogenized by the corresponding fly-eye lens 107 and then emitted to the corresponding light-combining mirror.

Optionally, when the projection light source 10 includes a light modulating mirror group, the fly eye lens 107 may be located between the laser and the light modulating mirror group, or may also be located between the light modulating mirror group 102 and the light combining mirror, which is not limited in this embodiment.

The fly-eye lens 107 has a limiting effect on the optical expansion. The fly-eye lens 107 may emit laser light having an incident angle smaller than the aperture angle of the fly-eye lens 107 at the aperture angle of the fly-eye lens 107. In the embodiment of the present application, after the laser of each color emitted by the laser 101 passes through the fly-eye lens 107, the divergence angles of the laser of different colors can be all adjusted to the aperture angle of the fly-eye lens 107, so as to ensure that the uniformity of the spot size formed by the laser of each color is good, and the light mixing effect of the laser of each color can be good. The fly-eye lens 107 can homogenize the incident laser light, reduce coherence between the laser light, further improve light mixing effect of the laser light of each color, weaken speckle effect of a projection picture formed based on the laser light, and improve display effect of the projection picture.

The fly-eye lens 107 may be formed by arranging a plurality of microlens arrays. The diameter of each microlens can be on the order of millimeters, micrometers, or even nanometers. Illustratively, each microlens in the fly-eye lens 107 has a length in the slow axis of the incident laser light that is greater than the length in the fast axis. If the fast axis is parallel to the first direction, i.e. the direction perpendicular to the plane of the paper in fig. 12; the slow axis is parallel to the second direction, i.e., the y-direction in fig. 12. The aperture angle of the microlens is positively correlated with its diameter, and the aperture angle of the microlens in the slow axis direction may be larger than that in the fast axis direction. Because the divergence angle of the laser light which irradiates to the fly-eye lens 107 on the slow axis is large, the fly-eye lens 107 can ensure that the aperture angles in different directions in the fly-eye lens 107 are matched with the divergence angle of the laser light in the direction, the aperture angles of the fly-eye lens in each direction are larger than the divergence angle of the incident laser light, and then the fly-eye lens 107 can adjust the divergence angles of the laser light of different colors in each direction to be basically consistent.

Alternatively, the position of fly-eye lens 107 may be fixed and held stationary with respect to the laser. Alternatively, the fly-eye lens 107 may be moved relative to the laser when the laser emits light. For example, fly-eye lens 107 may be moved back and forth within a range in the first direction, or may be moved back and forth within a range in the second direction. The range can be small, and it is required to ensure that the laser emitted from the laser can be emitted into the fly-eye lens 107 when the fly-eye lens 107 moves to any position.

In another alternative implementation, fig. 13 is a schematic structural diagram of a projection light source according to still another embodiment of the present application. As shown in fig. 13, the projection light source 10 may further include two diffusion sheet groups, each diffusion sheet group corresponding to one laser, each diffusion sheet group including a first diffusion sheet 108 and a second diffusion sheet 109. The degree of diffusion of the incident laser light by the first diffusion sheet 108 may be smaller than that of the incident laser light by the second diffusion sheet 109. As for the first laser 101, an orthographic projection of the first diffusion sheet 108 on the laser 101 covers the third light exit area Q3, and an orthographic projection of the second diffusion sheet 109 on the laser 101 covers the first light exit area Q1 and the second light exit area Q2. The laser light emitted from the third light emitting area Q3 can be diffused and homogenized by the first diffusion sheet 108 and then emitted to the first light combining mirror 103, and the laser light emitted from the first light emitting area Q1 and the second light emitting area Q2 can be diffused and homogenized by the second diffusion sheet 109 and then emitted to the first light combining mirror 103.

The diffusion sheet may homogenize the incident laser light and adjust a divergence angle of the laser light. In the embodiment of the present application, the diffusion degree of the first diffusion sheet 108 to the incident laser light is smaller than that of the second diffusion sheet 109 to the incident laser light, and the divergence angle of the laser light emitted from the first diffusion sheet 108 may be close to that of the laser light emitted from the second diffusion sheet 109. Therefore, the consistency of the sizes of the light spots of the lasers of all the colors is high, the mixing effect of the lasers of all the colors is good, the uniformity of the lasers of all the colors is high, and the display effect of a projection picture formed based on the mixed lasers is good.

Alternatively, the diffusion sheet may include a plurality of micro strip prisms arranged in parallel, and the prisms may have a triangular cross section. The larger the apex angle of the prism, the greater the degree of diffusion of the incoming light rays by the diffuser. The vertex angle refers to the angle far away from the diffusion sheet in the triangular section of the micro strip prism. In this embodiment, the vertex angle of each of the micro stripe prisms in the first diffusion sheet 108 may be smaller than the vertex angle of each of the micro stripe prisms in the second diffusion sheet 109, and the arrangement density of the micro stripe prisms in the first diffusion sheet 108 may be greater than the arrangement density of the micro stripe prisms in the second diffusion sheet 109.

Optionally, when the projection light source 10 includes a light modulation lens group, the two diffusion sheets may be located between the laser and the light modulation lens group, or may also be located between the light modulation lens group 102 and the light combining lens, which is not limited in this embodiment of the application. In the embodiment of the present application, the first diffusion sheet 108 and the second diffusion sheet 109 are provided independently, for example. Alternatively, the two diffusers can be two parts of a larger diffuser.

Alternatively, the positions of the first diffusion sheet 108 and the second diffusion sheet 109 may be fixed and kept stationary with respect to the laser. Alternatively, at least one of the first diffusion sheet 108 and the second diffusion sheet 109 may be moved relative to the laser when the laser emits light. For example, the diffusion sheet may be moved back and forth within a certain range in the first direction, or may be moved back and forth within a certain range in the second direction, or may be rotated or vibrated, or may be flipped back and forth within a certain angle range. When the diffusion sheet is rotated, the rotation axis of the rotation may be located at the center of the diffusion sheet or may be offset from the center to some extent. The position of the diffusion sheet can be changed in a small range, and the laser emitted by the laser 101 when the diffusion sheet moves to any position can be incident on the diffusion sheet.

In the embodiment of the present application, it is illustrated that the first diffusion sheet 108 and the second diffusion sheet 109 are both flat plates, that is, the light incident surface and the light emitting surface of the diffusion sheet may be parallel. Optionally, the diffusion sheet may also be wedge-shaped, and the light incident surface and the light emergent surface of the diffusion sheet may not be parallel. In the embodiment of the present application, the first diffusion sheet 108 and the second diffusion sheet 109 are both transmissive diffusion sheets.

The above-described embodiment in which the dodging member is provided between the laser and the light combining mirror may be used for other projection light sources. If this method can also be used in a projection light source in the related art, the embodiment of the present application is not limited.

In general, in a projection light source, a diffusion sheet is further provided in an optical path where laser light of each color emitted from a laser is mixed, so as to homogenize the mixed laser light of each color. Alternatively, when the fly eye lens 107 or the first diffusion sheet 108 and the second diffusion sheet 109 are provided in the projection light source 10 in the above manner, the diffusion sheet may not be provided in the projection light source 10 in the optical path after the laser light of each color is mixed, so as to simplify the structure of the projection light source and facilitate miniaturization of the projection light source. Alternatively, a diffusion sheet may be provided in the optical path after the mixing of the laser light of each color to further homogenize the mixed laser light of each color.

The following describes the arrangement of the diffusion sheet in the optical path after mixing the laser light of each color in the projection light source 10 with reference to the drawings. The following arrangement of the diffusion sheet can be applied to any of the projection light sources 10, and the present embodiment describes the arrangement of the diffusion sheet in the optical path after mixing the laser light of each color based on the projection light source 10 shown in fig. 1.

Fig. 14 is a schematic structural diagram of another projection light source according to still another embodiment of the present application, and fig. 15 is a schematic structural diagram of another projection light source according to still another embodiment of the present application. As shown in fig. 14 and 15, the projection light source 10 may further include at least one diffusion sheet located on a transmission path of the laser light emitted from the first light combiner 103 and the second light combiner 104. Such as the at least one diffuser, on the side of the second light combiner 104 remote from the first light combiner 103. Fig. 14 and 15 each illustrate an example in which the at least one diffusion sheet includes two diffusion sheets, i.e., a third diffusion sheet 110 and a fourth diffusion sheet 111. Optionally, the at least one diffusion sheet may also include only one diffusion sheet, which is not illustrated in the embodiments of the present application.

Optionally, each of the at least one diffuser may diffuse the incident laser light more strongly in the fast axis than in the slow axis. Since the laser light may diverge at a smaller angle in the fast axis than in the slow axis when it is directed to the diffuser, the divergence angle in the slow axis may be greater than 1 degree and the divergence angle in the fast axis may be less than 1 degree. The diffusion degree of diffusion piece on the fast axle is stronger in this application embodiment, and then can make laser more be close through diffusion piece back fast axle and the epaxial angle of divergence of slow, and the aspect ratio of the facula that laser formed can be less, can comparatively accord with the shape requirement to the laser that the projection light source sent.

In the embodiment of the present application, each of the third diffusion sheet 110 and the fourth diffusion sheet 111 may satisfy at least one of the following conditions: the diffusion sheet is a reflection type diffusion sheet or a transmission type diffusion sheet; the diffusion sheet is a diffusion sheet in a wedge shape or a flat plate shape; and the diffuser is kept static, or the diffuser is used for translating within a target range, or the diffuser is used for rotating along a target direction, or the diffuser is used for overturning within a target angle range. The diffusion sheet may be moved in a small range of its position to avoid moving outside the irradiation range of the laser light. Any one of the third diffusion sheet 110 and the fourth diffusion sheet 111 may be implemented by arbitrarily combining the three conditions. For example, the diffusion sheet can be a flat reflective diffusion sheet, and the diffusion sheet can be turned over back and forth within 1 degree; or the diffusion sheet can be a wedge-shaped transmission type diffusion sheet which can move back and forth within a certain range in the second direction; alternatively, the diffusion sheet may be a flat transmissive diffusion sheet that rotates clockwise with its center as a rotation axis. The diffusion sheet can also be realized in a plurality of optional modes, and the embodiment of the application is not listed.

For example, as shown in fig. 14, the third diffusion sheet 110 may be a reflective diffusion sheet, the fourth diffusion sheet 111 may be a transmissive diffusion sheet, and both diffusion sheets may have a flat plate shape. The first light combining mirror 103, the second light combining mirror 104, and the third diffusion sheet 110 may be sequentially arranged along the x direction, and the third diffusion sheet 110 and the fourth diffusion sheet 111 may be sequentially arranged along the z direction. The laser beam emitted from the second light combiner 104 along the x direction may be diffused by the third diffusion sheet 110 and reflected to the fourth diffusion sheet 111 along the z direction. The fourth diffusion sheet 111 further diffuses the incident laser light and emits the diffused laser light in the z direction. Alternatively, the third diffusion sheet 110 may be flipped back and forth in the x-direction and z-direction within a range of 1 degree or 2 degrees. In the process, the laser emitted from the third diffusion sheet 110 may have a displacement in the x direction, and the laser emitted from the third diffusion sheet 110 may have a relatively random phase, so that the speckle effect of a projection image formed by the laser may be reduced.

As shown in fig. 15, the third diffusion sheet 110 and the fourth diffusion sheet 111 may be both transmissive diffusion sheets, the third diffusion sheet 110 may have a wedge shape, and the fourth diffusion sheet 111 may have a flat plate shape. The first light combining mirror 103, the second light combining mirror 104, the third diffusion sheet 110, and the fourth diffusion sheet 111 may be arranged in order along the x direction. The laser beam emitted from the second beam combiner 104 in the x direction may be diffused by the third diffusion sheet 110 and the fourth diffusion sheet 111 in sequence, and emitted in the x direction. Alternatively, the third diffusion plate 110 is rotated with its center as a rotation axis. The third diffuser 110 is wedge-shaped and the laser light emitted from the diffuser 108 may be deflected to the side of the wider portion of the diffuser 108. During the rotation of the third diffusion sheet 110, the position of the laser emitted from the diffusion sheet 108 may continuously move in the circumferential direction, and the laser emitted from the third diffusion sheet 110 may have a relatively random phase, which may reduce the speckle effect of the projection image formed by the laser.

In the embodiment of the present application, the projection light source 10 may further include a light uniformizing part 112. The dodging member may be an optical outlet member of the projection light source 10, and is located at an end of an optical path in the projection light source 10. The dodging component can collect and homogenize laser and then shoot the laser to a subsequent modulation light path so as to facilitate subsequent picture projection.

As shown in fig. 14 and 15, the light unifying part 112 may be a fly-eye lens. The third diffusion sheet 110 and the fourth diffusion sheet 111 may be both positioned between the light combining mirror and the fly-eye lens. Alternatively, the distance between the diffusion sheet and the fly-eye lens may be larger, for example, the distance between the fourth diffusion sheet 111 and the fly-eye lens may be larger than 10 mm. Therefore, the laser can be transmitted from the diffusion sheet to the fly eye lens for a longer distance, so that the light spot is expanded to a certain extent. Because the optical expansion of the fly-eye lens to the incident laser is the integral of the area and the incident angle, the fly-eye lens emits more laser and has better light-homogenizing effect on the laser.

Fig. 16 is a schematic structural diagram of another projection light source according to yet another embodiment of the present disclosure. As shown in fig. 16, the light uniformizing part 112 in the projection light source 10 may be a light guide. In this case, the dodging member 112 may be preceded by a focusing lens 113 to focus the laser light to the light inlet of the light guide. The third diffusion sheet 110, the condensing lens 113, the fourth diffusion sheet 111, and the light guide 110 may be sequentially arranged. Optionally, the third diffusion sheet 110 and the fourth diffusion sheet 111 may also be both located in the light path before the converging lens 113, and this embodiment of the present application is not limited. The length direction of the light inlet of the light guide pipe can be parallel to the slow axis of the laser (namely the slow axis of the injected laser), and the width direction can be parallel to the fast axis of the laser, so that the matching of the light spot formed by the laser at the light inlet of the light guide pipe and the shape of the light inlet is ensured.

To sum up, in this application embodiment, the projection light source can include a plurality of lasers, and then the projection light source can send the laser of higher luminance, and the display luminance of the projection picture based on this laser formation is higher, carries out the display effect that can improve the projection picture. And the first light combining mirror and the second light combining mirror can mix and emit the laser light emitted by the first laser and the second laser along the arrangement direction of the two lasers. The length-width ratio of the light spot formed by the mixed laser can be smaller, the requirements of light receiving and laser projection are better met, the utilization rate of the laser can be improved, and the display effect of a projection picture formed on the basis of the laser is better.

Fig. 17 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application. As shown in fig. 17, the projection apparatus may include a projection light source 10, a light valve 20, and a lens 30. The projection light source may be any of the projection light sources described above, and may be any of the projection light sources shown in fig. 3 to 16. Fig. 17 exemplifies that the projection apparatus includes the projection light source shown in fig. 14.

Optionally, the projection device may further comprise a set of illumination mirrors 40 and a total internal reflection prism 50 between the projection light source 10 and the light valve 20. The laser emitted from the projection light source 10 can be emitted to the illumination mirror assembly 40, so as to be converged by the illumination mirror assembly 40 and emitted to the tir prism 50; the tir prism 50 then directs the incident laser light to the light valve 20. The light valve 20 is used for modulating the incident laser light and emitting the modulated laser light to the lens 30, and the lens 30 is used for projecting the incident laser light to form a projection picture.

For example, the light valve 20 may include a plurality of reflective sheets, each of which may be used to form a pixel in the projection image, and the light valve may reflect the laser light to the lens according to the image to be displayed, so as to modulate the light beam, where the reflective sheet corresponding to the pixel to be displayed in a bright state is used.

Illustratively, the lens 30 may be a telephoto lens, or may also be an ultra-short focus lens. The lens may include a plurality of lenses, and the lenses may be sequentially arranged in a certain direction. The laser emitted from the light valve 20 can pass through a plurality of lenses in the lens 30 in sequence to be emitted to the screen, so as to realize the projection of the laser by the lens and realize the display of the projection picture.

In the projection equipment provided by the embodiment of the application, the symmetry of the laser of each color emitted by the projection light source is higher, the consistency of the light spots is better, and then the laser emitted by the projection light source can form a projection picture with better display effect.

It should be noted that in the embodiments of the present application, the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "at least one" refers to one or more. The term "plurality" means two or more unless expressly limited otherwise. The term "at least one of a and B" in the present application is only one kind of association relation describing an associated object, and means that three kinds of relations may exist, for example, at least one of a and B may mean: a exists alone, A and B exist simultaneously, and B exists alone. The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. "substantially", "about", "substantially" and "close" mean within an acceptable error range, within which a person skilled in the art can solve the technical problem and achieve the technical result substantially.

In the drawings, the size of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. Like reference numerals refer to like elements throughout. Projection light source embodiments in the present application may be referred to with respect to projection device embodiments.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A projection light source, comprising: the laser comprises a first laser, a second laser, a first light combining mirror and a second light combining mirror; the first laser and the second laser are sequentially arranged along a first direction, and the first light combining mirror and the second light combining mirror are sequentially arranged along the first direction;

the laser emitted by the first laser device is emitted to the first light combining mirror, and the first light combining mirror is used for reflecting the emitted laser to the second light combining mirror along the first direction; the laser emitted by the second laser device is emitted to the second light combining mirror, and the second light combining mirror is used for reflecting the laser emitted by the second laser device along the first direction and transmitting the laser emitted by the first light combining mirror along the first direction.

2. The projection light source according to claim 1, wherein in the second light combining mirror, an irradiation region of the first laser light emitted from the second laser device and an irradiation region of the second laser light emitted from the first light combining mirror at least partially overlap each other, and an irradiation region of the second laser light emitted from the second laser device and an irradiation region of the first laser light emitted from the first light combining mirror at least partially overlap each other.

3. The projection light source of claim 2, wherein the first light combiner and the second light combiner are both one-piece lenses;

the emitting areas of the first laser and the second laser in the first laser are sequentially arranged along the first direction, and the emitting areas of the first laser and the second laser in the second laser are sequentially arranged along the reverse direction of the first direction.

4. The projection light source of claim 2, wherein the first light combining mirror comprises a first sub-mirror and a second sub-mirror, and the second light combining mirror comprises a third sub-mirror and a fourth sub-mirror;

the first laser emitted by the first laser is emitted to the first sub-lens, and the second laser emitted by the first laser is emitted to the second sub-lens; the first laser emitted by the second laser is emitted to the third sub-lens, and the second laser emitted by the second laser is emitted to the fourth sub-lens;

the first sub-lens is used for reflecting the incident first laser light to the third sub-lens along the first direction, the second sub-lens is used for reflecting the incident second laser light to the fourth sub-lens along the first direction, the third sub-lens is used for transmitting the first laser light and reflecting the second laser light along the first direction, and the fourth sub-lens is used for transmitting the second laser light and reflecting the first laser light along the first direction.

5. The projection light source of any one of claims 1 to 4, further comprising a first light modulation mirror and a second light modulation mirror arranged in sequence along the second direction; for each of the first and second lasers:

the emitting region of the second laser comprises a first light emitting region and a second light emitting region which are sequentially arranged along a second direction, and the first light emitting region and the second light emitting region are used for respectively emitting laser with different colors;

the orthographic projection of the first light adjusting mirror on the laser covers a partial region in the emitting region of the first laser and covers a partial region in the first light emitting region, and the orthographic projection of the second light adjusting mirror on the laser is positioned on one side, away from the first light emitting region, of the second light emitting region;

and part of the laser in the first laser and part of the laser emitted by the first light emitting area are emitted to the first light adjusting mirror, the first light adjusting mirror is used for reflecting the emitted laser to the second light adjusting mirror, and the second light adjusting mirror is used for reflecting the emitted laser to the first light combining mirror and the second light combining mirror.

6. The projection light source of any one of claims 1 to 4, wherein the divergence angle of the first laser light is larger than the divergence angle of the second laser light; for each of the first and second lasers:

the projection light source also comprises a fly-eye lens, the orthographic projection of the fly-eye lens on the laser device covers the emergent area of the first laser and the emergent area of the second laser, and the laser emitted by the laser device is homogenized by the fly-eye lens and then emitted to the first light combining mirror and the second light combining mirror;

or the projection light source further comprises a first diffusion sheet and a second diffusion sheet, and the diffusion degree of the first diffusion sheet to the laser is smaller than that of the second diffusion sheet to the laser; the orthographic projection of the first diffusion sheet on the laser covers the emergent area of the first laser, the orthographic projection of the second diffusion sheet on the laser covers the emergent area of the second laser, the first laser is diffused and homogenized by the first diffusion sheet and then emitted to the first light combining mirror, and the second laser is diffused and homogenized by the second diffusion sheet and then emitted to the second light combining mirror.

7. The projection light source of any of claims 1 to 4, wherein the projection light source further comprises: at least one diffusion sheet, the at least one diffusion sheet is positioned on a transmission path of the laser emitted by the first light-combining mirror and the second light-combining mirror;

the diffusion sheet diffuses the incident laser light more strongly in the fast axis than in the slow axis.

8. The projection light source of claim 7, wherein the diffusion sheet satisfies at least one of the following conditions:

the diffusion sheet is a reflection type diffusion sheet or a transmission type diffusion sheet;

the diffusion sheet is wedge-shaped or flat;

and the diffusion sheet is kept static, or the diffusion sheet is used for translating in a target range, or the diffusion sheet is used for rotating in a target direction, or the diffusion sheet is used for overturning in a target angle range.

9. The projection light source of claim 7, wherein the projection light source further comprises a fly-eye lens, and the at least one diffuser is located between the first combiner and the fly-eye lens;

or, the projection light source further comprises a converging lens and a light guide; the at least one diffusion sheet, the converging lens and the light guide pipe are sequentially arranged; or the at least one diffusion sheet comprises a third diffusion sheet and a fourth diffusion sheet, and the third diffusion sheet, the convergent lens, the fourth diffusion sheet and the light guide pipe are sequentially arranged.

10. A projection device, characterized in that the projection device comprises: the projection light source of any one of claims 1 to 9, and a light valve and lens;