CN114594610A

CN114594610A - Projection light source and projection equipment

Info

Publication number: CN114594610A
Application number: CN202210337502.8A
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: 2022-06-07
Anticipated expiration: 2042-03-31
Also published as: CN114594610B; CN117666265A

Abstract

The application discloses projection light source and projection equipment belongs to the photoelectric technology field. A second light-emitting area and a third light-emitting area of the laser in the projection light source are positioned on the same side of the first light-emitting area in the first direction and are sequentially arranged along the second direction; a partial region at one end far away from the third light emergent region in the second light emergent region is a second sub-region, and a partial region at the one end in the first light emergent region is a first sub-region; the light adjusting lens group is used for adjusting the laser emitted by the first sub-area and the laser emitted by the second sub-area to the side, far away from the second light emitting area, of the third light emitting area to emit to the first light combining lens and the second light combining lens respectively; the first light-combining mirror and the second light-combining mirror are used for emitting the incident laser 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 electro-optical technology, projection apparatuses are widely used. A projection light source in the projection apparatus may emit laser light of a plurality of colors, based on which a projection screen may be formed. The higher the symmetry of the laser light of each color emitted by the projection light source is, the better the mixing effect is, and the better the display effect of the projection picture is.

Fig. 1 is a schematic structural diagram of a projection light source provided in the related art. As shown in fig. 1, the projection light source 00 includes a laser 01 and a light combining mirror 02. Laser 00 may include two columns of light emitting chips, where one column of light emitting chips is used to emit red laser light, a portion of the light emitting chips in the other column of light emitting chips is used to emit green laser light, and the remaining portion of the light emitting chips is used to emit blue laser light. The light combining lens group 02 may include two light combining lenses, each light combining lens is located on a light emitting side of a row of light emitting chips, and is configured to emit laser light emitted by the row of light emitting chips along the z direction along the x direction, so as to mix laser light of various colors emitted by the laser 01.

Fig. 2 is a schematic diagram of a light spot formed by laser light emitted from a light combining lens assembly provided in the related art. As can be seen from fig. 2, the symmetry of the laser light of each color emitted by the projection light source in the related art is poor. Therefore, the mixing effect of the laser beams of the respective colors emitted from the projection light source is poor, and the display effect of the projection screen formed based on the laser beams 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:

an aspect provides a projection light source, including: the laser device comprises a laser device, a dimming mirror group, a first light combining mirror and a second light combining mirror, wherein the first light combining mirror and the second light combining mirror are both positioned on one side of the dimming mirror group, which is far away from the laser device;

the laser comprises a first light emitting area, a second light emitting area and a third light emitting area, wherein the first light emitting area, the second light emitting area and the third light emitting area are used for respectively emitting laser with different colors; the second light emitting area and the third light emitting area are positioned on the same side of the first light emitting area in a first direction and are sequentially arranged along a second direction, and the first direction is vertical to the second direction; a partial region of the second light emergent region, which is located at one end far away from the third light emergent region, is a second sub-region, and a partial region of the first light emergent region, which is located at the one end, is a first sub-region;

the light adjusting lens group is used for adjusting the laser emitted by the first sub-area and the laser emitted by the second sub-area to emit the laser to the first light combining lens and the second light combining lens from one side of the third light emitting area far away from the second light emitting area; laser light emitted from a region outside the first sub-region in the first light emitting region is emitted to the first light combining mirror, and laser light emitted from a region outside the second sub-region and laser light emitted from the third light emitting region in the second light emitting region are emitted to the second light combining mirror; the first light combining mirror and the second light combining mirror are used for emitting the incident laser along the first direction.

In yet 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 light adjusting lens group in the projection light source can adjust the laser that the first subregion of one end in the first light emergent area jetted out and the laser that the second subregion of same end jetted out in the second light emergent area to keeping away from one side in the second light emergent area from the third light emergent area and shoot respectively to first beam combiner and second beam combiner. Therefore, when the laser light from the second light emitting area irradiates the second light combining mirror, the laser light can be respectively positioned at two sides of the laser light emitted by the third light emitting area, and the symmetry of the laser light from the second light emitting area and the laser light from the third light emitting area is improved. Furthermore, after the light is mixed by the first light mixing lens and the second light mixing lens, the symmetry and the light mixing uniformity of the laser light of various colors are high, and the display effect of a projection picture formed based on the laser light can be good.

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 the related art;

fig. 2 is a schematic diagram of a light spot formed by laser light emitted from a light combining lens assembly provided in the related art;

fig. 3 is a schematic structural diagram of a projection light source provided in an embodiment of the present application;

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

FIG. 7 is a schematic diagram of a spot formed by laser emitted from a projection light source according to an embodiment of the present disclosure;

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

fig. 9 is a schematic structural diagram of a laser provided in an embodiment of the present application;

FIG. 10 is a schematic diagram of another laser structure provided in the embodiments of the present application;

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 another projection light source according to another embodiment of the present disclosure;

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 yet another embodiment of the present application;

FIG. 16 is a schematic diagram of another projection light source according to yet 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 optoelectronic 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 also higher and higher. The projection light source in the projection device is used for emitting laser beams of multiple colors, and the higher the symmetry of the laser beams of the multiple colors, the higher the coincidence degree, and the higher the light mixing uniformity, the better the display effect of a projection picture formed based on the laser beams is. In the related art, after the laser in the projection light source is emitted through the light combining lens group, the laser needs to be homogenized through the light homogenizing component and then subjected to subsequent picture projection. The closer the incident angle of the laser on the dodging member, the closer the homogenization effect of the dodging member on the laser. The distribution position of the light spots can reflect the incident angles of the light spots on the dodging component, the incident angles are larger when the light spots are closer to the two ends, and the incident angles are smaller when the light spots are closer to the center. The light spots formed by the laser on the light uniformizing part are similar to the light spots shown in fig. 2, and because the incident angles of the red laser, the green laser and the blue laser on the light uniformizing part are different greatly, the light uniformizing part has a large difference in the uniformizing effect on the laser with different colors, and the display effect of a projection picture formed based on the laser is poor.

The embodiment of the application provides a projection light source and projection equipment, the symmetry of the laser of various colours that this projection light source sent is higher, and the mixed light effect is better, can form the better projection picture of display effect.

Fig. 3 is a schematic structural diagram of a projection light source provided in an embodiment of the present application, fig. 4 is a schematic structural diagram of another projection light source provided in the embodiment of the present application, fig. 5 is a schematic structural diagram of another projection light source provided in the embodiment of the present application, and fig. 6 is a schematic structural diagram of another projection light source provided in the embodiment of the present application. Fig. 4 may be a right side view of the projection light source shown in fig. 3, fig. 5 may be a front view of the projection light source shown in fig. 3, and fig. 6 may be a top view of the projection light source shown in fig. 3.

As shown in fig. 3 to 6, the projection light source 10 may include: the device comprises a laser 101, a light adjusting mirror group 102, a first light combining mirror 103 and a second light combining mirror 104. The laser 101 may lase in a third direction (e.g., the z-direction). The light adjusting lens group 102, the first light combining lens 103 and the second light combining lens 104 are all located on the light emitting side of the laser 101, and the first light combining lens 103 and the second light combining lens 104 are all located on one side of the light adjusting lens group 102 far away from the laser 101.

The laser 101 may include a first light exiting region Q1, a second light exiting region Q2, and a third light exiting region Q3, each for emitting laser light of one color, and the colors of the laser light emitted by the different light exiting regions are different. The second light exiting region Q2 is located on the same side of the first light exiting region Q1 in the first direction (e.g., the x direction) as the third light exiting region Q3. The second light-exiting regions Q2 and the third light-exiting regions Q3 are sequentially arranged along a second direction (e.g., the y direction), the first direction is perpendicular to the second direction, and the first direction and the second direction are perpendicular to the third direction. Alternatively, the first light exiting zone Q1 may be rectangular. The first direction may be a longitudinal direction of the rectangle, and the second direction may be a width direction of the rectangle.

As shown in fig. 3, the second light-exiting region Q2 and the third light-exiting region Q3 are located at the right side of the first light-exiting region Q1, and the second light-exiting region Q2 and the first light-exiting region Q1, and the third light-exiting region Q3 and the first light-exiting region Q1 are sequentially arranged along the x direction. Alternatively, the second light exiting region Q2 and the third light exiting region Q3 may be both located at the left side of the first light exiting region Q1, and the second light exiting region Q2 and the first light exiting region Q1, and the third light exiting region Q3 and the first light exiting region Q1 may be both arranged in sequence along the direction opposite to the x direction. Alternatively, the positions of the second light exiting region Q2 and the third light exiting region Q3 in fig. 3 may be interchanged, and accordingly the second direction may be the opposite direction of the y direction.

The first light combining mirror 103 may correspond to the first light exiting region Q1, and the second light combining mirror 104 may correspond to the second light exiting region Q2 and the third light exiting region Q3. The first light combiner 103 and the second light combiner 104 may be arranged along a first direction. The laser beams emitted from the first light emitting area Q1 may be transmitted to the first light combining mirror 103, and the laser beams emitted from the second light emitting area Q2 and the third light emitting area Q3 may be transmitted to the second light combining mirror 104. Furthermore, the first combiner 103 and the second combiner 104 may further adjust the transmission direction of the incident laser light to a certain extent, so as to mix the laser light emitted from each light emitting area.

The partial region of the second light exiting region Q2 at the end remote from the third light exiting region Q3 may be the second sub-region (not shown), and the partial region of the first light exiting region Q1 at the end may be the first sub-region (not shown). The first and second sub-regions are partial regions of the first and second light exit regions Q1 and Q2, respectively, which are located at the same end. Optionally, the first and second sub-regions may be aligned in the 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.

The orthographic projection of the light adjusting lens group 102 on the laser 101 can cover a first sub-area in the first light emergent area Q1 and a second sub-area in the second light emergent area Q2, and the laser light emitted from the first sub-area and the second sub-area can be emitted to the light adjusting lens group 102 along the third direction. The light adjusting lens group 102 can adjust the laser light emitted from the first sub-area to emit the laser light to the first light combining lens 103 from the side of the third light emitting area Q3 far away from the second light emitting area Q2; the light adjusting lens group 102 can also adjust the laser light emitted from the second sub-area to emit from the side of the third light emitting area Q3 far away from the second light emitting area Q2 to the second light combining lens 104. The laser light emitted from the region other than the first sub-region in the first light exit region Q1 may be directed to the first light combining mirror 103, and the laser light emitted from the region other than the second sub-region in the second light exit region Q2 and the third light exit region Q3 may be directed to the second light combining mirror 104.

The first light combining mirror 103 and the second light combining mirror 104 are sequentially arranged along the first direction or the opposite direction. On a reference plane perpendicular to the first direction, the orthographic projection of the first light combining mirror 103 and the orthographic projection of the second light combining mirror 104 at least partially coincide. The first light combining mirror 103 and the second light combining mirror 104 are both configured to emit the incident laser light in 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 embodiment of the application, the first direction is taken as the x direction; the second light-emitting area Q2 and the first light-emitting area Q1, the third light-emitting area Q3 and the first light-emitting area Q1, and the second light-combining mirror 104 and the first light-combining mirror 103 are all sequentially arranged along the x direction; the first light combiner 103 and the second light combiner 104 are both used for emitting laser light in the x direction, for example. Optionally, the first direction may also be the opposite direction of the x direction; the second light-emitting area Q2 and the first light-emitting area Q1, the third light-emitting area Q3 and the first light-emitting area Q1, and the second light-combining mirror 104 and the first light-combining mirror 103 may be arranged along the x direction; the first and second light-combining

mirrors

103 and 104 can emit laser light in the opposite direction to the x direction.

For convenience of description, the laser light emitted from the first light emitting zone Q1, the laser light emitted from the second light emitting zone Q2, and the laser light emitted from the third light emitting zone Q3 will be referred to as first laser light, second laser light, and third laser light, respectively. Illustratively, the first light-combining mirror 103 is a dichroic mirror, and the second light-combining mirror 104 is a full-band mirror. The second beam combiner 104 may reflect the second laser beam and the third laser beam incident thereon toward the first beam combiner 103 in the first direction. The first beam combiner 103 may transmit the second laser beam and the third laser beam emitted from the second beam combiner 104 in the first direction and reflect the first laser beam in the first direction. Optionally, the second light combiner 104 may also be a dichroic mirror. The second light combining mirror 104 only needs to reflect the second laser light and the third laser light, and may transmit or reflect laser light of other colors.

Fig. 7 is a schematic diagram of a spot formed by laser emitted from a projection light source according to an embodiment of the present disclosure. The light spot may be formed by the laser beams emitted by the first light combining mirror 103 and the second light combining mirror 104 in the first direction. Spot G1 in fig. 7 is a spot formed by laser light originating from the first light exit area Q1, spot G2 is a spot formed by laser light originating from the second light exit area Q2, and spot G3 is a spot formed by laser light originating from the third light exit area Q3. As shown in fig. 7, in the embodiment of the present application, the symmetry of the laser light of each color with respect to the main optical axis of the projection light source is good, and the uniformity of the laser light distribution of each color is high.

In the embodiment of the present application, the laser light emitted from the second light exit area Q2 is divided into two parts, and the two parts are located on both sides of the laser light emitted from the third light exit area Q3. The spots formed by the two laser beams are located on the second beam combiner 104 on both sides of the spot formed by the laser beam emitted from the third light-emitting area Q3. Therefore, the symmetry conditions of the second laser and the third laser can be ensured to be more similar, and the symmetry axes of the second laser and the third laser are close to each other. For example, the center of the beam formed by the second laser may be close to or even coincident with the center of the beam formed by the third laser. And then the difference of the incident angle when the second laser and the third laser are injected into the subsequent light homogenizing part can be smaller, the homogenization effect consistency of the light homogenizing part on the second laser and the third laser can be better, and the light mixing effect of the second laser and the third laser 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. In this way, the irradiation position of the first laser beam on the first beam combiner 103 can be kept small in deviation from the irradiation positions of the second laser beam and the third laser beam on the second beam combiner 104. After the first light combining mirror 103 and the second light combining mirror 104 emit the incident laser light in the first direction, the laser light of each color has good symmetry about the main optical axis of the projection light source, 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 ensured to be good.

To sum up, in the projection light source provided in the embodiment of the present application, the light adjusting lens group can adjust the laser light emitted from the first sub-area at one end of the first light emitting area and the laser light emitted from the second sub-area at the same end of the second light emitting area to emit from one side of the third light emitting area far away from the second light emitting area to the first light combining mirror and the second light combining mirror respectively. Therefore, when the laser light from the second light emitting area irradiates the second light combining mirror, the laser light can be respectively positioned at two sides of the laser light emitted by the third light emitting area, and the symmetry of the laser light from the second light emitting area and the laser light from the third light emitting area is improved. Furthermore, after the light is mixed by the first light mixing lens and the second light mixing lens, the symmetry and the light mixing uniformity of the laser light of various colors are high, and the display effect of a projection picture formed based on the laser light can be good.

Optionally, the projection light source 10 may further include a light uniformizing part. The dodging component can be positioned on the light emitting sides of the first light combining mirror and the second light combining mirror. The laser beams of various colors emitted by the first light-combining lens and the second light-combining lens along the first direction can be emitted into the light-homogenizing component and further homogenized by the light-homogenizing component and then emitted, and the laser beams emitted by the light-homogenizing component are used for forming a subsequent projection picture. The light homogenizing member may include a light pipe or a fly-eye lens.

The following describes the light adjusting lens group 102 in the embodiment of the present application with reference to the drawings.

With reference to fig. 3 to fig. 6, the light adjusting lens group 102 may include a first light adjusting lens 1021 and a second light adjusting lens 1022 sequentially arranged along the second direction. An orthographic projection of the first dimming mirror 1021 on the laser 101 covers a first sub-zone in the first light exit area Q1 and a second sub-zone in the second light exit area Q2. The orthographic projection of the second light-adjusting mirror 1022 on the laser 101 is located outside the third light exit region Q3 and on the side of the third light exit region Q3 away from the second light exit region Q2. The laser beams emitted from the first sub-area and the second sub-area may both be emitted to the first light modulation mirror 1021, the first light modulation mirror 1021 is configured to reflect the emitted laser beams to the second light modulation mirror 1022, the second light modulation mirror 1022 is configured to reflect the emitted laser beams from the first sub-area to the first light combining mirror 103, and reflect the emitted laser beams from the second sub-area to the second light combining mirror 104.

In a first alternative of the light adjusting lens group 102, please refer to fig. 3 to fig. 6, wherein the first light adjusting lens 1021 and the second light adjusting lens 1022 are both a one-piece lens. The first dimming mirror 1021 and the second dimming mirror 1022 may each have a rectangular shape, and a length direction of the rectangular shape may be parallel to the first direction. The first dimming mirror 1021 and the second dimming mirror 1022 may be both obliquely disposed, and the first dimming mirror 1021 and the second dimming mirror 1022 are parallel. The second light modulation mirror 1022 is located on the same side of the first light modulation mirror 1021 as the laser 101, so as to ensure that the first light modulation mirror 1021 can reflect the laser light emitted by the laser 101 from the first light modulation mirror 1021 to the second light modulation mirror 1022. The first dimming mirror 1021, the first light combining mirror 103 and the second light combining mirror 104 are located on the same side of the second dimming mirror 1022, so that the second dimming mirror 1022 can reflect the laser light emitted from the first dimming mirror 1021 to the first light combining mirror 103 and the second light combining mirror 104. For example, the first dimming mirror 1021 and the second dimming mirror 1022 may both form an angle of 45 degrees with the second direction, and may also form an angle of 45 degrees with the third direction.

In the embodiment of the present application, the sizes of the first dimming mirror 1021 and the second dimming mirror 1022 may be designed according to the size of the light spot formed by the received laser light, and each of the dimming mirrors needs to ensure that the size is greater than or equal to the size of the light spot formed by the received laser light. Alternatively, the first dimming mirror 1021 and the second dimming mirror 1022 may be the same in size and arrangement. Alternatively, the laser emitted from the second sub-region may form a light spot on the first light modulation lens 1021, the overall length of the light spot may be in a range from 2.5 mm to 3.5 mm, and the overall width of the light spot may be in a range from 1.5 mm to 2.5 mm, for example, the overall size of the light spot may be about 3 mm × 2 mm. The size of the light spot formed on the first light modulation lens 1021 by the laser emitted from the first sub-area is smaller than the size of the light spot formed on the first light modulation lens 1021 by the laser emitted from the second sub-area. Alternatively, the lengths of the first dimming mirror 1021 and the second dimming mirror 1022 may range from 9 mm to 10 mm, and the widths may range from 1.5 mm to 3 mm. For example, the first dimming mirror 1021 and the second dimming mirror 1022 may each have a size of 10 mm × 2 mm.

In a second alternative of the light adjusting lens group 102, each of the first light adjusting lens 1021 and the second light adjusting lens 1022 may include a plurality of individual lenses. Fig. 8 is a schematic structural diagram of a projection light source according to another embodiment of the present disclosure. As shown in fig. 8, the first dimming mirror 1021 includes a first sub-mirror J1 and a second sub-mirror J2, and the second dimming mirror 1022 includes a third sub-mirror J3 and a fourth sub-mirror J4. The orthographic projection of the first sub-mirror J1 on the laser 101 covers the first sub-zone, and the orthographic projection of the second sub-mirror J2 on the laser 101 covers the second sub-zone. The first sub-lens J1 and the third sub-lens J3 may be sequentially arranged along the second direction, and the second sub-lens J2 and the fourth sub-lens J4 may also be sequentially arranged along the second direction.

The first sub-lens J1, the second sub-lens J2, the third sub-lens J3, and the fourth sub-lens J4 can all be disposed obliquely. The four sub-lenses may all be parallel. The laser 101 and the third lens J3 are located on the same side of the first sub-lens J1, and the first sub-lens J1 and the first combiner 103 are located on the same side of the third sub-lens J3. In this way, the laser beam emitted from the first sub-area can be directed to the first sub-mirror J1, the first sub-mirror J1 is used for reflecting the incident laser beam to the third sub-mirror J3, and the third sub-mirror J3 is used for reflecting the incident laser beam to the first combiner 103. The laser 101 and the fourth sub-mirror J4 are located on the same side of the second sub-mirror J2, and the second sub-mirror J2 and the second combiner 104 are located on the same side of the fourth sub-mirror J4. In this way, the laser beam emitted from the second sub-area can be directed to the second sub-mirror J2, the second sub-mirror J2 is used for directing the emitted laser beam to the fourth sub-mirror J4, and the fourth sub-mirror J4 is used for reflecting the emitted laser beam to the second combiner 104. For example, the included angles between the four sub-lenses and the second direction may be 45 degrees, and the included angles between the four sub-lenses and the third direction may also be 45 degrees.

In the embodiment of the present application, the size of each sub-lens can be determined according to the size of a light spot formed by the received laser. Optionally, the first sub-lens J1, the second sub-lens J2, the third sub-lens J3, and the fourth sub-lens J4 can all be the same in size and arrangement. If the four sub-lenses are all rectangular, the length direction of the rectangle can be parallel to the first direction. Alternatively, each sub-lens may have a length in a range of 2.5 mm to 4 mm and a width in a range of 1.5 mm to 3 mm, e.g., each sub-lens may have a dimension of about 3 mm to 2 mm. Alternatively, the spot size formed by the laser emitted from the first sub-area and the spot size formed by the laser emitted from the second sub-area may be different, and the sizes of the first sub-lens J1 and the second sub-lens J2 may be different. Since the laser light received by the third sub-mirror J3 is the laser light emitted by the first sub-mirror J1, and the laser light received by the fourth sub-mirror J4 is the laser light emitted by the second sub-mirror J2, the first sub-mirror J1 and the third sub-mirror J3 may have the same size, and the second sub-mirror J2 and the fourth sub-mirror J4 may have the same size.

Optionally, the light modulation mirror in the embodiment of the present application may be a reflecting mirror. The light adjusting mirror can be made of metal materials, or can be obtained by plating a reflective film on a transparent lens. Optionally, the light modulating mirror may also be a dichroic mirror. Only the light adjusting mirror is required to be capable of emitting the incident laser along the required direction, and no consideration is given to whether the laser with other colors can be transmitted or not.

The laser 101 in the embodiment of the present application will be described below with reference to the drawings.

The laser 101 in the embodiment of the present application may be a multi-color laser. A multicolor laser is a laser that emits laser light of multiple colors. Fig. 9 is a schematic structural diagram of a laser according to an embodiment of the present disclosure. Fig. 10 is a schematic structural diagram of another laser provided in an embodiment of the present application. Fig. 9 may be a top view of the laser shown in fig. 10, and fig. 10 may be a schematic of section a-a' in the laser shown in fig. 9. Referring to fig. 3 to 10, the laser 101 may include a base 1011 and two light emitting modules (not shown). 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. 9, 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, one surface of the collimator lens group 1014 close to the base plate 1011 is a plane, one surface of the collimator lens group 1014 far from the base plate 1011 has a plurality of convex arc surfaces, and a portion of each of the 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.

In the embodiment of the present application, the light emitting chips 1013 in different light emitting modules in the laser 101 may be used to emit laser light of different colors. 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. 9 and 10, 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 on the left side in fig. 9, and the second light emitting module may be the light emitting module on the right side in fig. 9. 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 of the light emitting chip is configured to emit red laser light, the second type 1013b of the light emitting chip is configured to emit blue laser light, and the third type 1013c of the light emitting chip is configured to emit 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.

In the embodiment of the present application, the first light emitting area Q1 of the laser 101 may be a region where the first light emitting module is located, the second light emitting area Q2 is a region where the second light emitting chip 1013b of the region where the second light emitting module is located, and the third light emitting area Q3 is a region where the third light emitting chip 1013c of the region where the second light emitting module is located. The first sub-region in the first light exiting region Q1 may be a region where a portion of the first type light emitting chip 1013a at one end of the first light emitting module is located. The second sub-region in the second light exiting region Q2 may be a region where a portion of the second type light emitting chip 1013b at one end of the second light emitting module is located.

Alternatively, the second sub-regions may be half the area of the second light exit region Q2, or the second sub-regions may be slightly larger or smaller than half the area of the second light exit region Q2. The size of the first sub-area may be set accordingly based on the size of the second sub-area. In this way, the second laser light emitted from the second light emitting area Q2 can be equally divided into two parts, so that the two parts of laser light are respectively located at two sides of the third laser light when being emitted to the second light combining mirror 104, and the highest symmetry of the second laser light can be ensured. Illustratively, in the embodiment of the present application, the second light exiting area Q2 includes two light emitting chips 1013b of the second type, and the second sub-area may be an area where the light emitting chip 1013b of the second type is located far from the light emitting chip 1013c of the third type. 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.

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. 9 and 10, and the description of the embodiment of the present application is omitted. In the laser 101, each light-emitting area is an area where each light-emitting chip is located.

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 first light exit region Q1 of the laser 101 is larger than the divergence angles of the laser light emitted from the second light exit region Q2 and the third light exit region Q3. 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, and the formation of subsequent projection pictures is not facilitated.

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 present application, a component for adjusting the divergence angle of the laser may be disposed between the laser 101 and the light combining mirror to which the laser emitted from the laser is emitted, so as to ensure that the divergence angles of the lasers with different colors emitted to the light combining mirror are closer, and ensure that the uniformity of the light spots of the lasers with different colors after light combining is higher in the transmission process.

In an alternative implementation, 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: fly-eye lens 105. Fly-eye lens 105 may be located between laser 101 and the combiner (i.e., first combiner 103 and second combiner 104). The orthographic projection of the fly eye lens 105 on the laser 101 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 101 can be homogenized by the fly eye lens 105 and then emitted to the first light combining mirror 103 and the second light combining mirror 104. For example, the laser light emitted from the first light emitting region Q1 is homogenized by the fly eye lens 105 and emitted to the first light combining mirror 103, and the laser light emitted from the second light emitting region Q2 and the third light emitting region Q3 is homogenized by the fly eye lens 105 and emitted to the second light combining mirror 104.

In fig. 12, the fly-eye lens 105 is positioned between the laser 101 and the light adjusting lens group 102 as an example. The laser light emitted from the first sub-region in the first light-exiting region Q1 and the second sub-region in the second light-exiting region Q2 in the laser 101 may be homogenized by the fly-eye lens 105 and then emitted to the first dimming mirror 1021. Optionally, the fly-eye lens 105 may also be located between the light adjusting lens group 102 and the light combining lens, and the projection light source in this case is not illustrated in the embodiment of the present application. At this time, the laser light emitted from the second light modulation mirror 1022 may be homogenized by the fly eye lens 105 and then emitted to the first light combining mirror 103 and the second light combining mirror 104.

Fly-eye lens 105 has a limiting effect on the optical expansion. The fly-eye lens 105 can emit laser light having an incident angle smaller than the aperture angle of the fly-eye lens 105 at the aperture angle of the fly-eye lens 105. In the embodiment of the present application, after the laser of each color emitted by the laser 101 passes through the fly-eye lens 105, the divergence angles of the laser of different colors can be all adjusted to the aperture angle of the fly-eye lens 105, 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 105 can homogenize the incident laser light, reduce coherence among 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.

Fly-eye lens 105 may be formed by arranging a plurality of microlens arrays. The diameter of each microlens may be on the order of millimeters, micrometers, or even nanometers. Illustratively, each microlens in fly-eye lens 105 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 105 on the slow axis is large, the fly-eye lens 105 is arranged in such a way that the aperture angles in different directions in the fly-eye lens 105 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 ensured to be larger than the divergence angle of the incident laser light, and then the fly-eye lens 105 can adjust the divergence angles of the laser light of various colors in each direction to be basically consistent.

Alternatively, the position of fly-eye lens 105 may be fixed and held stationary with respect to laser 101. Alternatively, fly-eye lens 105 may be moved relative to laser 101 while laser 101 is emitting light. Such as fly-eye lens 105, may be moved back and forth over a range of first directions, or may be moved back and forth over a range of second directions. The range can be small, and it is necessary to ensure that the laser light emitted from the laser 101 can be incident on the fly-eye lens 105 when the fly-eye lens 105 moves to any position.

In another alternative implementation, fig. 13 is a schematic structural diagram of another projection light source provided in another embodiment of the present application. As shown in fig. 13, the projection light source 10 may further include a first diffusion sheet 106 and a second diffusion sheet 107. The degree of diffusion of the incident laser light by the first diffusion sheet 106 may be smaller than the degree of diffusion of the incident laser light by the second diffusion sheet 107. An orthographic projection of the first diffusion sheet 106 on the laser 101 covers the first light exiting region Q1, and an orthographic projection of the second diffusion sheet 107 on the laser 101 covers the second light exiting region Q2 and the third light exiting region Q3. The laser light emitted from the first light emitting area Q1 can be diffused and homogenized by the first diffusion sheet 106 and then emitted to the first light combining mirror 103, and the laser light emitted from the second light emitting area Q2 and the third light emitting area Q3 can be diffused and homogenized by the second diffusion sheet 107 and then emitted to the second light combining mirror 104.

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 106 to the incident laser light is smaller than that of the second diffusion sheet 107, and the divergence angle of the laser light emitted from the first diffusion sheet 106 may be close to that of the laser light emitted from the second diffusion sheet 107. 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 incident light by the diffusion sheet. 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 106 may be smaller than the vertex angle of each of the micro stripe prisms in the second diffusion sheet 107, and the arrangement density of the micro stripe prisms in the first diffusion sheet 106 may be greater than the arrangement density of the micro stripe prisms in the second diffusion sheet 107.

It should be noted that, in fig. 13, the two diffusion sheets are located between the laser 101 and the light adjusting mirror group 102 as an example. The laser light emitted from the first sub-region in the first light-emitting region Q1 and the laser light emitted from the second sub-region in the second light-emitting region Q2 in the laser 101 may be homogenized by the two diffusion sheets, respectively, and then emitted to the first light modulation mirror 1021. Optionally, the two diffusion sheets may also be located between the light adjusting lens group 102 and the light combining lens, and the projection light source in this case is not illustrated in this embodiment of the application. At this time, the laser light emitted from the second light modulation mirror 1022 may be homogenized by the two diffusion sheets and then emitted to the first light combining mirror 103 and the second light combining mirror 104.

In the embodiment of the present application, the first diffusion sheet 106 and the second diffusion sheet 107 are provided independently. Alternatively, the two diffusers can be two parts of a larger diffuser.

Alternatively, the positions of the first diffuser 106 and the second diffuser 107 may be fixed and kept stationary with respect to the laser 101. Alternatively, at least one of the first diffusion sheet 106 and the second diffusion sheet 107 may be moved relative to the laser 101 when the laser 101 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 106 and the second diffusion sheet 107 are both flat plates, that is, the light incident surface and the light emitting surface of the diffusion sheets may be parallel. Optionally, the diffusion sheet may also be wedge-shaped, and the light incident surface and the light emitting surface of the diffusion sheet may not be parallel. In the embodiment of the present application, the first diffusion sheet 106 and the second diffusion sheet 107 are both transmissive diffusion sheets.

The above-described embodiment in which the dodging member is provided between the laser 101 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 the projection light source, a diffusion sheet is further provided in an optical path where the laser light of each color emitted from the laser 101 is mixed, so as to homogenize the mixed laser light of each color. Alternatively, when the fly eye lens 105 is provided in the projection light source 10 or the first diffusion sheet 106 and the second diffusion sheet 107 are provided 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 that the structure of the projection light source is simplified, and the projection light source is miniaturized. 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. 3.

Fig. 14 is a schematic structural diagram of another projection light source according to another embodiment of the present application, and fig. 15 is a schematic structural diagram of a projection light source according to yet 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 and second

light combining mirrors

103 and 104. Such as the at least one diffuser, is located on the side of the first light combiner 103 remote from the second light combiner 104. Fig. 14 and 15 each illustrate an example in which the at least one diffusion sheet includes two diffusion sheets, a third diffusion sheet 108 and a fourth diffusion sheet 109. 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 108 and the fourth diffusion sheet 109 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 to a smaller position in order to avoid moving outside the irradiation range of the laser light. Any one of the third diffusion sheet 108 and the fourth diffusion sheet 109 may be realized 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 108 may be a reflective diffusion sheet, the fourth diffusion sheet 109 may be a transmissive diffusion sheet, and both diffusion sheets may have a flat plate shape. The second light combining mirror 104, the first light combining mirror 103, and the third diffusion sheet 108 may be arranged in sequence along the x direction, and the third diffusion sheet 108 and the fourth diffusion sheet 109 may be arranged in sequence along the z direction. The laser light emitted from the first light combining mirror 103 in the x direction may be diffused by the third diffusion sheet 108 and reflected to the fourth diffusion sheet 109 in the z direction. The fourth diffusion sheet 109 diffuses the incident laser light and emits the diffused laser light in the z direction. Alternatively, the third diffuser 108 may be flipped back and forth in the x-direction and z-direction planes by 1 degree or 2 degrees. In the process, the laser emitted from the third diffusion sheet 108 may have a displacement in the x direction, and the laser emitted from the third diffusion sheet 108 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 108 and the fourth diffusion sheet 109 may be both transmissive diffusion sheets, the third diffusion sheet 108 may be wedge-shaped, and the fourth diffusion sheet 109 may be flat. The second light combining mirror 104, the first light combining mirror 103, the third diffusion sheet 108, and the fourth diffusion sheet 109 may be arranged in order along the x direction. The laser light emitted from the first light combining mirror 103 in the x direction may be diffused by the third diffusion sheet 108 and the fourth diffusion sheet 109 in sequence, and emitted in the x direction. Alternatively, the third diffusion plate 108 is rotated with its center as a rotation axis. The third diffuser 108 is wedge-shaped and the laser light exiting the diffuser 108 may be deflected to the side of the wider portion of the diffuser 108. In the rotation process of the third diffusion sheet 108, 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 108 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 110. 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 110 may be a fly-eye lens. The third diffusion sheet 108 and the fourth diffusion sheet 109 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 109 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. The fly-eye lens has the advantages that the fly-eye lens has a large number of laser beams emitted by the fly-eye lens and a good light homogenizing effect on the laser beams because the optical expansion of the incident laser beams is the integral of the area and the incident angle.

Fig. 16 is a schematic structural diagram of another projection light source according to still another embodiment of the present disclosure. As shown in fig. 16, the light uniformizing part 110 of the projection light source 10 may be a light guide. In this case, a converging lens 111 may be disposed in front of the dodging member 110 to converge the laser light to the light inlet of the light guide. The third diffusion sheet 108, the condensing lens 111, the fourth diffusion sheet 109, and the light guide 110 may be sequentially arranged. Optionally, the third diffusion plate 108 and the fourth diffusion plate 109 may also be both located in the light path before the converging lens 111, 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.

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 relationship describing an associated object, and means that three kinds of relationships 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 association object, and means that there may be three kinds of relationships, for example, a and/or B, and 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 this application may be referenced 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 device comprises a laser device, a dimming mirror group, a first light combining mirror and a second light combining mirror, wherein the first light combining mirror and the second light combining mirror are both positioned on one side of the dimming mirror group, which is far away from the laser device;

2. The projection light source of claim 1, wherein the light adjusting lens group comprises a first light adjusting lens and a second light adjusting lens which are arranged in sequence along the second direction;

the orthographic projection of the first light adjusting mirror on the laser covers the first sub-area and the second sub-area; the orthographic projection of the second light adjusting mirror on the laser is positioned on one side, away from the second light emergent area, of the third light emergent area;

the laser emitted from the first sub-area and the second sub-area is emitted to the first light modulation mirror, the first light modulation mirror is used for reflecting the emitted laser to the second light modulation mirror, the second light modulation mirror is used for reflecting the emitted laser from the first sub-area to the first light combination mirror, and the emitted laser from the second sub-area is reflected to the second light combination mirror.

3. The projection light source of claim 2, wherein the first and second dimming mirrors are rectangular, and a length direction of the rectangle is parallel to the first direction.

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

the orthographic projection of the first sub-lens on the laser covers the first sub-area, and the orthographic projection of the second sub-lens on the laser covers the second sub-area; the first sub-lenses and the third sub-lenses are sequentially arranged along the second direction, and the second sub-lenses and the fourth sub-lenses are sequentially arranged along the second direction;

the laser emitted by the first sub-area is emitted to the first sub-lens, the first sub-lens is used for reflecting the emitted laser to the third sub-lens, and the third sub-lens is used for reflecting the emitted laser to the first light combining mirror; the laser emitted from the second sub-area is emitted to the second sub-lens, the second sub-lens is used for emitting the emitted laser to the fourth sub-lens, and the fourth sub-lens is used for reflecting the emitted laser to the second light combiner.

5. The projection light source of any one of claims 1 to 4, wherein the second sub-region is a half region of the second light exit region.

6. The projection light source of any one of claims 1 to 4, wherein the divergence angle of the laser light emitted by the first light emitting area is larger than the divergence angles of the laser light emitted by the second light emitting area and the third light emitting area;

the projection light source further comprises a fly-eye lens, the orthographic projection of the fly-eye lens on the laser device covers the first light emitting area, the second light emitting area and the third light emitting area, and 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 first light-emitting area, the orthographic projection of the second diffusion sheet on the laser covers the second light-emitting area and the third light-emitting area, laser emitted by the first light-emitting area is diffused and homogenized by the first diffusion sheet and then emitted to the first light-combining mirror, and laser emitted by the second light-emitting area and the third light-emitting area 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 positioned 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;