Projection light source and projection device

Abstract

The application discloses a projection light source and a projection device, and belongs to the technical field of photoelectricity. The laser in the projection light source can emit multiple colors, multiple light emitting chips in the light emitting module are arranged in a row, and the multiple light emitting chips include first type light emitting chips and second type light emitting chips, and the number and color of the first type light emitting chips and the second type light emitting chips are different. A first light emitting area is a region where the first type light emitting chips are located, a second light emitting area is a region where the second type light emitting chips are located, and a light adjusting lens group is used for adjusting part of laser emitted from one end of the first light emitting area away from the second light emitting area to be emitted from one end of the second light emitting area away from the first light emitting area, so that the laser emitted from the first light emitting area is located on both sides of the laser emitted from the second light emitting area after being emitted from the light adjusting lens group, and the symmetry of the laser emitted from the first light emitting area and the second light emitting area is improved.

Description

[0001] This application is a divisional application of Chinese Invention Application 202210337502.8 (2022-03-31), entitled "Projection Light Source and Projection Device". Technical Field

[0002] This application relates to the field of optoelectronic technology, and in particular to a projection light source and projection device. Background Technology

[0003] With the development of optoelectronic technology, projection equipment has been widely used. The projection light source in a projection device can emit lasers of various colors, which can then be used to form a projected image. The higher the symmetry of the different colors of laser light emitted by the projection light source, the better the mixing effect, and thus the better the display effect of the projected image.

[0004] Figure 1 This is a structural diagram of a projection light source provided by related technologies. For example... Figure 1 As shown, the projection light source 00 includes a laser 01 and a beam combiner assembly 02. The laser 00 may include two rows of light-emitting chips, one row of which emits red laser light, and a portion of the chips in the other row emits green laser light, with the remaining chips emitting blue laser light. The beam combiner assembly 02 may include two beam combiners, each located on the light-emitting side of one row of light-emitting chips, used to direct the laser light emitted along the z-direction of that row of chips along the x-direction, thereby achieving the mixing of various colors of laser light emitted by the laser 01.

[0005] Figure 2 This is a schematic diagram of the light spot formed by a laser emitted from a beam combiner assembly, provided by related technology. Figure 2 It is known that the symmetry of the various colors of laser emitted by the projection light source in the relevant technology is poor. Therefore, the mixing effect of the various colors of laser emitted by the projection light source is poor, and the display effect of the projected image formed based on this laser is poor. Summary of the Invention

[0006] This application provides a projection light source and projection device, which can solve the problem of poor display effect of projected images. The technical solution includes: On the one hand, a projection light source is provided, which includes: a laser, a dimming mirror group, a first beam combiner and a second beam combiner, wherein the first beam combiner and the second beam combiner are both located on the side of the dimming mirror group away from the laser; The laser includes a first light-emitting region, a second light-emitting region, and a third light-emitting region for emitting lasers of different colors respectively; the second light-emitting region and the third light-emitting region are located on the same side of the first light-emitting region in a first direction and are arranged sequentially along a second direction, the first direction being perpendicular to the second direction; a portion of the second light-emitting region located at the end furthest from the third light-emitting region is a second sub-region, and a portion of the first light-emitting region located at the same end is a first sub-region; The dimming mirror assembly is used to adjust the laser emitted from the first sub-region and the laser emitted from the second sub-region so that they are directed from the side of the third light-emitting region away from the second light-emitting region toward the first beam combiner and the second beam combiner, respectively; the laser emitted from the region outside the first sub-region in the first light-emitting region is directed toward the first beam combiner, and the laser emitted from the region outside the second sub-region in the second light-emitting region and the third light-emitting region is directed toward the second beam combiner; both the first beam combiner and the second beam combiner are used to emit the incident laser along the first direction.

[0007] In another aspect, a projection device is provided, the projection device comprising: the above-mentioned projection light source, as well as a light valve and a lens; The projection light source is used to emit laser light into the light valve, the light valve is used to modulate the emitted laser light and direct it toward the lens, and the lens is used to project the emitted laser light to form a projected image.

[0008] The beneficial effects of the technical solution provided in this application include at least the following: In this application, the dimming lens group in the projection light source can adjust the laser emitted from the first sub-region at one end of the first light-emitting area and the laser emitted from the second sub-region at the same end of the second light-emitting area so that they are directed from the side of the third light-emitting area away from the second light-emitting area towards the first and second beam combiners, respectively. In this way, the laser originating from the second light-emitting area can be positioned on either side of the laser emitted from the third light-emitting area when it reaches the second beam combiner, improving the symmetry between the lasers originating from the second and third light-emitting areas. Furthermore, after being mixed by the first and second beam combiners, the symmetry and mixing uniformity of the various colors of laser light are high, resulting in a better display effect for the projected image formed by this laser. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1This is a schematic diagram of the structure of a projection light source provided by related technologies; Figure 2 This is a schematic diagram of a laser spot formed by a laser emitted from a beam combiner assembly, provided by related technologies. Figure 3 This is a schematic diagram of the structure of a projection light source provided in an embodiment of this application; Figure 4 This is a schematic diagram of another projection light source provided in an embodiment of this application; Figure 5 This is a schematic diagram of another projection light source provided in the embodiments of this application; Figure 6 This is a schematic diagram of another projection light source provided in the embodiments of this application; Figure 7 This is a schematic diagram of a light spot formed by a laser emitted from a projection light source according to an embodiment of this application; Figure 8 This is a schematic diagram of the structure of a projection light source provided in another embodiment of this application; Figure 9 This is a schematic diagram of the structure of a laser provided in an embodiment of this application; Figure 10 This is a schematic diagram of another laser structure provided in an embodiment of this application; Figure 11 This is a schematic diagram of a laser spot formed by a projection light source provided by related technologies; Figure 12 This is a schematic diagram of another projection light source provided in another embodiment of this application; Figure 13 This is a schematic diagram of another projection light source provided in another embodiment of this application; Figure 14 This is a schematic diagram of the structure of another projection light source provided in another embodiment of this application; Figure 15 This is a schematic diagram of the structure of a projection light source provided in another embodiment of this application; Figure 16 This is a schematic diagram of another projection light source provided in another embodiment of this application; Figure 17 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0012] With the development of optoelectronic technology, projection equipment is being used more and more widely, and the requirements for the display effect of the projected image are also becoming increasingly higher. The projection light source in a projection device emits lasers of multiple colors. The higher the symmetry, overlap, and light mixing uniformity of these laser colors, the better the display effect of the projected image. In related technologies, after the laser in the projection light source is emitted through a beam combiner, it needs to be homogenized by a light homogenizing component before subsequent image projection. The closer the incident angles of the laser on the light homogenizing component, the closer the homogenizing effect of the component. The distribution position of the laser spot reflects its incident angle on the light homogenizing component; the closer the spot is to the ends, the larger the incident angle; the closer it is to the center, the smaller the incident angle. The laser spot formed on the light homogenizing component and... Figure 2 The light spots shown are similar. Because the incident angles of red, green and blue lasers on the homogenizing component are quite different, the homogenizing effect of the homogenizing component on lasers of different colors is quite different, resulting in poor display effect of the projected image based on the laser.

[0013] This application provides a projection light source and projection device. The projection light source emits lasers of various colors with high symmetry and good light mixing effect, which can form a projection image with good display effect.

[0014] Figure 3 This is a schematic diagram of the structure of a projection light source provided in an embodiment of this application. Figure 4 This is a schematic diagram of another projection light source provided in an embodiment of this application. Figure 5 This is a schematic diagram of another projection light source provided in an embodiment of this application. Figure 6 This is a schematic diagram of another projection light source provided in the embodiments of this application. Figure 4 It can be Figure 3 The right view of the projection light source shown. Figure 5 It can be Figure 3 The front view of the projection light source shown. Figure 6 It can be Figure 3 The top view of the projection light source shown.

[0015] like Figures 3 to 6 As shown, the projection light source 10 may include: a laser 101, a dimming mirror assembly 102, a first beam combiner 103, and a second beam combiner 104. The laser 101 can emit laser light in a third direction (such as the z-direction). The dimming mirror assembly 102, the first beam combiner 103, and the second beam combiner 104 are all located on the light-emitting side of the laser 101, and the first beam combiner 103 and the second beam combiner 104 are both located on the side of the dimming mirror assembly 102 away from the laser 101.

[0016] Laser 101 may include a first emitting region Q1, a second emitting region Q2, and a third emitting region Q3. Each emitting region emits a laser of a different color, and the colors of the laser emitted by different emitting regions are different. The second emitting region Q2 and the third emitting region Q3 are located on the same side of the first emitting region Q1 in a first direction (e.g., the x-direction). The second emitting region Q2 and the third emitting region Q3 are arranged sequentially along a second direction (e.g., the y-direction), where the first direction is perpendicular to the second direction, and both the first and second directions are perpendicular to the third direction. Optionally, the first emitting region Q1 may be rectangular. The first direction may be the length direction of the rectangle, and the second direction may be the width direction of the rectangle.

[0017] like Figure 3 The second light-emitting region Q2 and the third light-emitting region Q3 are both located to the right of the first light-emitting region Q1. The second light-emitting region Q2 and the first light-emitting region Q1, as well as the third light-emitting region Q3 and the first light-emitting region Q1, are arranged sequentially along the x-direction. Optionally, the second light-emitting region Q2 and the third light-emitting region Q3 can also be located to the left of the first light-emitting region Q1, and the second light-emitting region Q2 and the first light-emitting region Q1, as well as the third light-emitting region Q3 and the first light-emitting region Q1, can also be arranged sequentially in the opposite direction of the x-direction. Optionally, Figure 3 The positions of the second light-emitting region Q2 and the third light-emitting region Q3 can also be interchanged, and the corresponding second direction can be the opposite direction of the y direction.

[0018] The first beam combiner 103 can correspond to the first light-emitting region Q1, and the second beam combiner 104 can correspond to the second light-emitting region Q2 and the third light-emitting region Q3. The first beam combiner 103 and the second beam combiner 104 can be arranged along a first direction. The laser emitted from the first light-emitting region Q1 can be uniformly transmitted to the first beam combiner 103, and the lasers emitted from the second light-emitting region Q2 and the third light-emitting region Q3 can be uniformly transmitted to the second beam combiner 104. Furthermore, the first beam combiner 103 and the second beam combiner 104 can further adjust the transmission direction of the incident laser to achieve the mixing of the lasers emitted from each light-emitting region.

[0019] The portion of the second light-emitting region Q2 located at the end furthest from the third light-emitting region Q3 can be considered a second sub-region (not shown in the figure), and the portion of the first light-emitting region Q1 located at that end is considered a first sub-region (not shown in the figure). The first sub-region and the second sub-region are portions of the first light-emitting region Q1 and the second light-emitting region Q2 located at the same end, respectively. Optionally, the first sub-region and the second sub-region can be aligned in a first direction. For example, the ends of the first sub-region and the second sub-region closest to other areas in the light-emitting region can be aligned in the first direction. The areas of the first sub-region and the second sub-region can be equal or unequal, and this application embodiment does not limit this.

[0020] The orthographic projection of the dimming mirror assembly 102 onto the laser 101 can cover the first sub-region in the first light-emitting region Q1 and the second sub-region in the second light-emitting region Q2. Lasers emitted from these first and second sub-regions can be directed towards the dimming mirror assembly 102 along a third direction. The dimming mirror assembly 102 can adjust the laser emitted from the first sub-region to be directed from the side of the third light-emitting region Q3 away from the second light-emitting region Q2 towards the first beam combiner 103; the dimming mirror assembly 102 can also adjust the laser emitted from the second sub-region to be directed from the side of the third light-emitting region Q3 away from the second light-emitting region Q2 towards the second beam combiner 104. Lasers emitted from the area outside the first sub-region in the first light-emitting region Q1 can be directly directed towards the first beam combiner 103, and lasers emitted from the area outside the second sub-region in the second light-emitting region Q2 and from the third light-emitting region Q3 can be directly directed towards the second beam combiner 104.

[0021] The first beam combiner 103 and the second beam combiner 104 are arranged sequentially along the first direction or its opposite direction. On a reference plane perpendicular to the first direction, the orthographic projection of the first beam combiner 103 and the orthographic projection of the second beam combiner 104 at least partially coincide. Both the first beam combiner 103 and the second beam combiner 104 are used to emit the incident laser along the first direction. It should be noted that the reference plane mentioned in this application is only a hypothetical plane used to describe the position and size relationship between the various devices, and may not be an actual surface existing in the projection light source. In this embodiment, the first direction is taken as the x-direction; the second light-emitting region Q2 and the first light-emitting region Q1, the third light-emitting region Q3 and the first light-emitting region Q1, and the second beam combiner 104 and the first beam combiner 103 are all arranged sequentially along the x-direction; and the first beam combiner 103 and the second beam combiner 104 are both used to emit the laser along the x-direction. Optionally, the first direction can also be the opposite direction of the x direction; the second light-emitting region Q2 and the first light-emitting region Q1, the third light-emitting region Q3 and the first light-emitting region Q1, and the second beam combiner 104 and the first beam combiner 103 can still be arranged along the x direction; the first beam combiner 103 and the second beam combiner 104 can emit laser light in the opposite direction of the x direction.

[0022] For ease of description, the laser emitted from the first output region Q1 will be referred to as the first laser, the laser emitted from the second output region Q2 as the second laser, and the laser emitted from the third output region Q3 as the third laser. For example, the first beam combiner 103 is a dichroic mirror, and the second beam combiner 104 is a full-band reflector. The second beam combiner 104 can reflect the incident second and third lasers along a first direction back to the first beam combiner 103. The first beam combiner 103 can transmit the second and third lasers emitted from the second beam combiner 104 along the first direction and reflect the first laser along the first direction. Optionally, the second beam combiner 104 can also be a dichroic mirror. The second beam combiner 104 only needs to reflect the second and third lasers; it can transmit or reflect lasers of other colors.

[0023] For example, Figure 7 This is a schematic diagram of a laser spot formed by a projection light source provided in an embodiment of this application. The laser spot can be the laser spot formed after the first beam combiner 103 and the second beam combiner 104 emit the incident laser along a first direction. Figure 7 In the diagram, spot G1 is the laser spot formed by the laser originating from the first emission region Q1, spot G2 is the laser spot formed by the laser originating from the second emission region Q2, and spot G3 is the laser spot formed by the laser originating from the third emission region Q3. For example... Figure 7 As shown, in the embodiments of this application, the symmetry of lasers of various colors about the principal optical axis of the projection light source is good, and the distribution uniformity of lasers of various colors is high.

[0024] In this embodiment, the laser emitted from the second light-emitting region Q2 is divided into two parts, which are located on either side of the laser emitted from the third light-emitting region Q3. On the second beam combiner 104, the light spots formed by these two laser parts are located on either side of the light spot formed by the laser emitted from the third light-emitting region Q3. This ensures that the symmetry of the second and third lasers is more similar, and their axes of symmetry are close. For example, the center of the beam formed by the second laser and the center of the beam formed by the third laser can be close to or even coincident. Consequently, the difference in the incident angle between the second and third lasers when they enter the subsequent homogenizing component can be smaller, resulting in better homogenization of the second and third lasers and a better mixing effect.

[0025] Furthermore, when adjusting the second laser, the dimming mirror assembly 102 also adjusts a portion of the first laser from one end to the other. This ensures that the illumination position of the first laser in the first beam combiner 103 is minimally deviated from the illumination positions of the second and third lasers in the second beam combiner 104. Consequently, after the first beam combiner 103 and the second beam combiner 104 emit the incident lasers along the first direction, the symmetry of the various colors of lasers about the principal optical axis of the projection light source is good, and the centers of different colors of lasers can approach or even coincide, ensuring a good mixing effect of the various colors of lasers emitted by the projection light source.

[0026] In summary, in the projection light source provided in this application embodiment, the dimming lens assembly can adjust the laser emitted from the first sub-region at one end of the first light-emitting region and the laser emitted from the second sub-region at the same end of the second light-emitting region so that they are directed from the side of the third light-emitting region away from the second light-emitting region towards the first and second beam combiners, respectively. In this way, the laser originating from the second light-emitting region can be positioned on both sides of the laser emitted from the third light-emitting region when it is directed towards the second beam combiner, improving the symmetry between the lasers originating from the second and third light-emitting regions. Furthermore, after being mixed by the first and second beam combiners, the symmetry and mixing uniformity of the various colors of laser light are high, resulting in a better display effect for the projected image formed by this laser.

[0027] Optionally, the projection light source 10 may further include a light homogenizing component. This light homogenizing component may be located on the light-emitting side of the first and second beam combiners. Lasers of various colors emitted from the first and second beam combiners along a first direction can enter the light homogenizing component, be homogenized by it, and then emitted. The laser emitted by the light homogenizing component is then used to form the subsequent projected image. The light homogenizing component may include a light guide or a compound eye lens.

[0028] The dimming lens group 102 in the embodiments of this application will now be described in conjunction with the accompanying drawings.

[0029] Please continue to refer to this. Figures 3 to 6 The dimming mirror assembly 102 may include a first dimming mirror 1021 and a second dimming mirror 1022 arranged sequentially along a second direction. The orthographic projection of the first dimming mirror 1021 onto the laser 101 covers the first sub-region of the first light-emitting region Q1 and the second sub-region of the second light-emitting region Q2. The orthographic projection of the second dimming mirror 1022 onto the laser 101 is located outside the third light-emitting region Q3 and is located on the side of the third light-emitting region Q3 away from the second light-emitting region Q2. The lasers emitted from the first sub-region and the second sub-region can both be directed toward the first dimming mirror 1021. The first dimming mirror 1021 is used to reflect the incoming laser to the second dimming mirror 1022, and the second dimming mirror 1022 is used to reflect the incoming laser originating from the first sub-region toward the first beam combiner 103 and the incoming laser originating from the second sub-region toward the second beam combiner 104.

[0030] In the first optional configuration of the dimming lens group 102, please refer to... Figures 3 to 6Both the first dimming mirror 1021 and the second dimming mirror 1022 are single-piece lenses. Both the first dimming mirror 1021 and the second dimming mirror 1022 can be rectangular, with the length of the rectangle parallel to a first direction. Both the first dimming mirror 1021 and the second dimming mirror 1022 can be tilted, and the first dimming mirror 1021 and the second dimming mirror 1022 are parallel. The second dimming mirror 1022 and the laser 101 are located on the same side of the first dimming mirror 1021, ensuring that the first dimming mirror 1021 can reflect the laser emitted from the laser 101 towards the second dimming mirror 1022. The first dimming mirror 1021, the first beam combiner 103, and the second beam combiner 104 are located on the same side of the second dimming mirror 1022, ensuring that the second dimming mirror 1022 can reflect the laser emitted from the first dimming mirror 1021 towards the first beam combiner 103 and the second beam combiner 104. For example, the angle between the first dimming mirror 1021 and the second dimming mirror 1022 and the second direction can both be 45 degrees, and the angle between them and the third direction can also both be 45 degrees.

[0031] In this embodiment, the dimensions of the first dimming mirror 1021 and the second dimming mirror 1022 can be designed based on the size of the laser spot they receive. Each dimming mirror must ensure that its size is greater than or equal to the size of the laser spot it receives. Optionally, the dimensions and arrangement of the first dimming mirror 1021 and the second dimming mirror 1022 can be the same. Optionally, the overall length of the laser spot formed on the first dimming mirror 1021 by the laser emitted from the second sub-region can range from 2.5 mm to 3.5 mm, and the overall width can range from 1.5 mm to 2.5 mm. For example, the overall size of the spot can be approximately 3 mm * 2 mm. The difference in size between the laser spot formed on the first dimming mirror 1021 by the laser emitted from the first sub-region and the laser spot formed on the first dimming mirror 1021 by the laser emitted from the second sub-region is small. Optionally, the length of the first dimming mirror 1021 and the second dimming mirror 1022 can range from 9 mm to 10 mm, and the width can range from 1.5 mm to 3 mm. For example, the dimensions of both the first dimming mirror 1021 and the second dimming mirror 1022 can be 10 mm * 2 mm.

[0032] In a second alternative configuration of the dimming lens assembly 102, both the first dimming lens 1021 and the second dimming lens 1022 may include multiple individual lenses. Figure 8 This is a schematic diagram of the structure of a projection light source provided in another embodiment of this application. For example... Figure 8As shown, the first dimming mirror 1021 includes a first sub-lens J1 and a second sub-lens J2, and the second dimming mirror 1022 includes a third sub-lens J3 and a fourth sub-lens J4. The orthographic projection of the first sub-lens J1 onto the laser 101 covers the first sub-region, and the orthographic projection of the second sub-lens J2 onto the laser 101 covers the second sub-region. The first sub-lens J1 and the third sub-lens J3 can be arranged sequentially along a second direction, and the second sub-lens J2 and the fourth sub-lens J4 can also be arranged sequentially along a second direction.

[0033] The first sub-lens J1, second sub-lens J2, third sub-lens J3, and fourth sub-lens J4 can all be tilted. These four sub-lenses can all be parallel. The laser 101 and the third sub-lens J3 are located on the same side of the first sub-lens J1, and the first sub-lens J1 and the first beam combiner 103 are located on the same side of the third sub-lens J3. Thus, the laser emitted from the first sub-region can be directed towards the first sub-lens J1, which reflects the incoming laser towards the third sub-lens J3, and the third sub-lens J3 reflects the incoming laser towards the first beam combiner 103. The laser 101 and the fourth sub-lens J4 are located on the same side of the second sub-lens J2, and the second sub-lens J2 and the second beam combiner 104 are located on the same side of the fourth sub-lens J4. Thus, the laser emitted from the second sub-region can be directed towards the second sub-lens J2, which reflects the incoming laser towards the fourth sub-lens J4, and the fourth sub-lens J4 reflects the incoming laser towards the second beam combiner 104. For example, the angles between the four sub-lenses and the second direction can all be 45 degrees, and the angles between them and the third direction can also all be 45 degrees.

[0034] In this embodiment, the size of each sub-lens can be determined based on the size of the light spot formed by the received laser. Optionally, the sizes and arrangement of the first sub-lens J1, second sub-lens J2, third sub-lens J3, and fourth sub-lens J4 can all be the same. For example, all four sub-lenses are rectangular, and the length direction of the rectangle can be parallel to the first direction. Optionally, the length of each sub-lens can range from 2.5 mm to 4 mm, and the width can range from 1.5 mm to 3 mm, such as the size of each sub-lens being approximately 3 mm * 2 mm. Optionally, the light spot size formed by the laser emitted from the first sub-region can be different from the light spot size formed by the laser emitted from the second sub-region, and thus the sizes of the first sub-lens J1 and the second sub-lens J2 can be different. Since the laser received by the third sub-lens J3 is the laser emitted by the first sub-lens J1, and the laser received by the fourth sub-lens J4 is the laser emitted by the second sub-lens J2, the sizes of the first sub-lens J1 and the third sub-lens J3 can be the same, and the sizes of the second sub-lens J2 and the fourth sub-lens J4 can be the same.

[0035] Optionally, in this embodiment, the dimming mirror can be a reflective mirror. The dimming mirror can be made of metal or can be obtained by coating a reflective film on a transparent lens. Optionally, the dimming mirror can also be a dichroic mirror. It is only necessary to ensure that the dimming mirror can emit the incident laser in the desired direction; whether other colors of laser light can be transmitted is not considered.

[0036] The laser 101 in the embodiments of this application will now be described in conjunction with the accompanying drawings.

[0037] The laser 101 in this embodiment can be a multicolor laser. A multicolor laser is a laser that can emit laser light of multiple colors. Figure 9 This is a schematic diagram of the structure of a laser provided in an embodiment of this application. Figure 10 This is a schematic diagram of another laser provided in an embodiment of this application. Figure 9 It can be Figure 10 The top view of the laser shown is shown. Figure 10 It can be Figure 9 The diagram shows a cross-section a-a' of the laser. Please refer to... Figures 3 to 10 The laser 101 may include a base plate 1011 and two light-emitting modules (not shown in the figure). The orthographic projection of a device (such as a dimming mirror or a beam combiner) on the laser 101 in the embodiments of this application can refer to the orthographic projection of the device on the base plate 1011 of the laser 101.

[0038] Both light-emitting modules are located on the base plate 1011, and can be arranged sequentially along the first direction. Each light-emitting module may include an annular tube wall 1012 and multiple light-emitting chips 1013 surrounded by the tube wall 1012. Optionally, each light-emitting module may be elongated, and the orthographic projection of each light-emitting module on the base plate 1011 may be approximately rectangular. The length direction of this rectangle may be parallel to the second direction, and the width direction may be parallel to the first direction.

[0039] like Figure 9 As shown, the plurality of light-emitting chips 1013 in each light-emitting module can be arranged in at least one row along the first direction. This embodiment of the application uses the plurality of light-emitting chips arranged in only one row as an example; optionally, the plurality of light-emitting chips can also be arranged in multiple rows, such as two or three rows, and this embodiment of the application does not impose a limitation. Optionally, the slow axis of the laser emitted by the plurality of light-emitting chips 1013 in each light-emitting module can all be parallel to the first direction.

[0040] It should be noted that the propagation speed of laser light varies in different light vector directions. The direction of the light vector with a faster propagation speed is called the fast axis, and the direction of the light vector with a slower propagation speed is called the slow axis. 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 can be parallel to the surface of the light-emitting chip 1013. For example, the fast axis can be in the z-direction, and the slow axis can be in the y-direction. The divergence angle of the laser light on the fast axis is greater than that on the slow axis. For example, the divergence angle on the fast axis is generally more than three times that on 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 smaller, the distance between the light-emitting chips 1013 can be smaller, and the arrangement density of the light-emitting chips 1013 can be larger, which is beneficial to the miniaturization of the laser, while avoiding interference and overlap of laser light emitted by adjacent light-emitting chips 1013. Optionally, multiple light-emitting chips 1013 in the light-emitting module can also be arranged in an array, forming multiple rows and columns. This embodiment of the application does not limit this arrangement.

[0041] Each light-emitting module may further include a collimating lens group 1014, multiple heat sinks 1015, multiple reflecting prisms 1016, and a light-transmitting sealing layer 1018. The multiple heat sinks 1015 and multiple reflecting prisms 1016 may each correspond one-to-one with multiple light-emitting chips 1013 in the light-emitting module. Each light-emitting chip 1013 is located on its corresponding heat sink 1015, which assists in heat dissipation for the corresponding light-emitting chip 1013. The material of the heat sink 1015 may include ceramic. Each reflecting prism 1016 is located on the light-emitting side of its corresponding light-emitting chip 1013. The light-transmitting sealing layer 1018 is located on the side of the tube wall 1012 away from the base plate 1011, and is used to seal the opening on the side of the tube wall 1012 away from the base plate 1011, so that it, together with the base plate 1011 and the tube wall 1012, forms a sealed space. Alternatively, the laser 101 may not include the light-transmitting sealing layer 1018, and the collimating lens assembly 1014 may be directly fixed to the surface of the tube wall 1012 away from the base plate 1011. In this way, the collimating lens assembly 1014, the tube wall 1012, and the base plate 1011 together form a sealed space.

[0042] The collimating lens group 1014 is located on the side of the light-transmitting sealing layer 1018 away from the base plate 1011. The collimating lens group 1014 includes multiple collimating lenses (not shown in the figure) corresponding one-to-one with the multiple light-emitting chips 1013. In the embodiments of this application, each collimating lens in each collimating lens group 1014 can be integrally formed. For example, the collimating lens group 1014 is generally plate-shaped, with the side of the collimating lens group 1014 near the base plate 1011 being flat, and the side away from the base plate 1011 having multiple convex arc surfaces, each of which is a collimating lens.

[0043] The light-emitting chip 1013 can emit laser light towards the corresponding reflecting prism 1016. The reflecting prism 1016 can reflect the laser light away from the base plate 1011 in a direction (such as the z-direction) towards the collimating lens corresponding to the light-emitting chip 1013 in the collimating lens group 1014. The laser light can then be collimated by the collimating lens before being emitted. It should be noted that after adjustment by the collimating lens, the divergence angle of the laser light emitted by the light-emitting chip 1013 on the fast axis can be smaller than the divergence angle on the slow axis.

[0044] In this embodiment, the light-emitting chips 1013 in different light-emitting modules of the laser 101 can be used to emit lasers of different colors. It should be noted that the light-emitting chips can be classified according to their emission color; each type of light-emitting chip can emit laser of one color, and different types of light-emitting chips are used to emit lasers of different colors. In this embodiment, 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 a light-emitting module may include multiple types of light-emitting chips.

[0045] For example, such as Figure 9 and Figure 10 As shown, the laser 101 may include a first light-emitting module and a second light-emitting module, wherein the first light-emitting module can be... Figure 9 The light-emitting module located on the left side in the middle, the second light-emitting module can be Figure 9 The light-emitting module is located on the right side. This first light-emitting module may include multiple first-type light-emitting chips 1013a, and the second light-emitting module may include multiple second-type light-emitting chips 1013b and multiple third-type light-emitting chips 1013c. The wavelengths of the lasers emitted by the first-type light-emitting chips 1013a, second-type light-emitting chips 1013b, and third-type light-emitting chips 1013c decrease sequentially. For example, the first-type light-emitting chip 1013a emits red laser light, the second-type light-emitting chip 1013b emits blue laser light, and the third-type light-emitting chip 1013c emits green laser light. That is, the first laser is red, the second laser is blue, and the third laser is green. The lasers emitted by these three types of light-emitting chips can also be other colors, such as the third-type light-emitting chip 1013b emitting yellow laser light; this embodiment does not limit the color.

[0046] It should be noted that this embodiment of the application illustrates the following example: the number of first-type light-emitting chips 1013a in the first light-emitting module is 4, the number of second-type light-emitting chips 1013b in the second light-emitting module is 3, and the number of third-type light-emitting chips 1013c is 2. The number of these three types of light-emitting chips can also be adjusted according to requirements. For example, the number of first-type light-emitting chips 1013a can be 5 or other values, the number of second-type light-emitting chips 1013b can be 4 or other values, and the number of third-type light-emitting chips 1013c can be 3 or other values. This embodiment of the application does not impose any limitations on this.

[0047] In this embodiment, the first light-emitting region Q1 of the laser 101 can be the region where the first light-emitting module is located, the second light-emitting region Q2 is the region where the second type of light-emitting chip 1013b is located within the region where the second light-emitting module is located, and the third light-emitting region Q3 is the region where the third type of light-emitting chip 1013c is located within the region where the second light-emitting module is located. The first sub-region of the first light-emitting region Q1 can be the region where a portion of the first type of light-emitting chip 1013a is located at one end of the first light-emitting module. The second sub-region of the second light-emitting region Q2 can be the region where a portion of the second type of light-emitting chip 1013b is located at one end of the second light-emitting module.

[0048] Optionally, the second sub-region can be half of the second light-emitting region Q2, or the second sub-region can be slightly larger or smaller than half of the second light-emitting region Q2. The size of the first sub-region can be set accordingly based on the size of the second sub-region. In this way, the second laser emitted from the second light-emitting region Q2 can be divided into two parts, so that the two parts of the laser are located on both sides of the third laser when they are directed toward the second beam combiner 104, thereby ensuring the highest symmetry of the second laser. For example, in this embodiment, the second light-emitting region Q2 includes two second-type light-emitting chips 1013b, and the second sub-region can be the area where the second-type light-emitting chip 1013b is located, which is far away from the third-type light-emitting chip 1013c. Correspondingly, the first sub-region can be the area where one second-type light-emitting chip 1013b is located. The size of the first sub-region and the second sub-region can also be adjusted accordingly according to the number and arrangement of various types of light-emitting chips, which is not limited in this embodiment.

[0049] Alternatively, the laser 101 may also consist of only a tube wall 1012, such as Figure 1 The laser shown is an example. Multiple light-emitting chips 1013 in the laser 101 can be arranged in multiple rows and columns within a single tube wall 1012. The arrangement of these multiple light-emitting chips 1013 can be similar to... Figure 9 and Figure 10 The arrangement of the light-emitting chips 1013 is the same, and will not be described again in this embodiment. In this type of laser 101, each light-emitting area is the area where various types of light-emitting chips are located.

[0050] It should be noted that the divergence angle of the red laser emitted by the laser is greater than that of the green and blue lasers. That is, the divergence angle of the laser emitted from the first output region Q1 of laser 101 is greater than that of the lasers emitted from the second output region Q2 and the third output region Q3. As the laser propagates along this divergence angle, the difference between the spot area of ​​the red laser and the spot areas of the green and blue lasers will become increasingly larger. For example... Figure 11 This is a schematic diagram of a laser spot formed by a projection light source provided by related technology. For example... Figure 11 As shown, in related technologies, the area of ​​the red light spot is much larger than the areas of the green and red light spots. This results in poor mixing of different colored lasers, which is detrimental to the formation of the subsequent projected image.

[0051] The embodiments of this application can also be improved based on the above-mentioned projection light source to ensure that the difference in the divergence angle of different colors of laser emitted by the projection light source is small, further improving the mixing effect of different colors of laser and improving the display effect of the projection image formed based on the laser.

[0052] In this embodiment, a component for adjusting the divergence angle of the laser can be provided between the laser 101 and the beam combiner to which the emitted laser is directed, so as to ensure that the divergence angles of different colors of lasers directed toward the beam combiner are closer, and to ensure that the spot consistency of each color of laser after beam combining is high during the transmission process.

[0053] In one alternative implementation, Figure 12 This is a schematic diagram of another projection light source provided in another embodiment of this application. For example... Figure 12 As shown, the projection light source 10 may further include a compound eye lens 105. The compound eye lens 105 may be located between the laser 101 and the beam combiners (i.e., the first beam combiner 103 and the second beam combiner 104). The orthographic projection of the compound eye lens 105 onto the laser 101 covers the first light-emitting region Q1, the second light-emitting region Q2, and the third light-emitting region Q3. The laser emitted from the laser 101 can be homogenized by the compound eye lens 105 and then directed towards the first beam combiner 103 and the second beam combiner 104. For example, the laser emitted from the first light-emitting region Q1 is homogenized by the compound eye lens 105 and then directed towards the first beam combiner 103, while the lasers emitted from the second light-emitting region Q2 and the third light-emitting region Q3 are homogenized by the compound eye lens 105 and then directed towards the second beam combiner 104.

[0054] It should be noted that, Figure 12Taking the compound eye lens 105 located between the laser 101 and the dimming mirror group 102 as an example, the laser emitted from the first sub-region of the first light-emitting region Q1 and the second sub-region of the second light-emitting region Q2 in the laser 101 can be homogenized by the compound eye lens 105 and then directed towards the first dimming mirror 1021. Optionally, the compound eye lens 105 can also be located between the dimming mirror group 102 and the beam combiner; this embodiment of the application does not illustrate the projection light source in this case. In this case, the laser emitted from the second dimming mirror 1022 can be homogenized by the compound eye lens 105 before being directed towards the first beam combiner 103 and the second beam combiner 104.

[0055] The compound eye lens 105 limits the optical spread. The compound eye lens 105 allows lasers with incident angles smaller than its aperture angle to exit at the aperture angle of the compound eye lens 105. In this embodiment, after the lasers of various colors emitted by the laser 101 pass through the compound eye lens 105, the divergence angles of different colors can be adjusted to the aperture angle of the compound eye lens 105, ensuring good consistency in the spot size formed by each color laser and good mixing effect. Furthermore, the compound eye lens 105 can homogenize the incident laser, reducing the coherence between lasers, further improving the mixing effect of each color laser, and reducing the speckle effect of the projected image based on the laser, thus improving the display effect of the projected image.

[0056] The compound eye lens 105 can be formed by arranging multiple microlens arrays. The diameter of each microlens can be on the order of millimeters, micrometers, or even nanometers. For example, the length of each microlens in the compound eye lens 105 along the slow axis of the incident laser is greater than its length along the fast axis. This fast axis is parallel to a first direction, i.e. Figure 12 The middle axis is perpendicular to the plane of the paper; the slow axis is parallel to the second direction, that is... Figure 12 The aperture angle of a microlens is positively correlated with its diameter, and the aperture angle of the microlens in the slow axis direction can be greater than that in the fast axis direction. Since the laser beam incident on the compound eye lens 105 has a large divergence angle on the slow axis, this configuration of the compound eye lens 105 ensures that the aperture angle in different directions of the compound eye lens 105 matches the divergence angle of the laser beam in that direction, ensuring that the aperture angle of the compound eye lens in each direction is greater than the divergence angle of the incident laser beam. Therefore, the compound eye lens 105 can adjust the divergence angle of each color laser beam to be basically consistent in each direction.

[0057] Optionally, the position of the compound eye lens 105 can be fixed and remain stationary relative to the laser 101. Alternatively, the compound eye lens 105 can also move relative to the laser 101 when the laser 101 emits light. For example, the compound eye lens 105 can move back and forth within a certain range in a first direction, or it can also move back and forth within a certain range in a second direction. This range can be small, but it must ensure that the laser emitted by the laser 101 can enter the compound eye lens 105 no matter where it is moved.

[0058] In another alternative implementation, Figure 13 This is a schematic diagram of another projection light source provided in another embodiment of this application. For example... Figure 13 As shown, the projection light source 10 may further include a first diffuser 106 and a second diffuser 107. The diffusion degree of the first diffuser 106 on the incident laser may be less than that of the second diffuser 107. The orthographic projection of the first diffuser 106 onto the laser 101 covers the first emission region Q1, and the orthographic projection of the second diffuser 107 onto the laser 101 covers the second emission region Q2 and the third emission region Q3. The laser emitted from the first emission region Q1 can be diffused and homogenized by the first diffuser 106 and then directed towards the first beam combiner 103, while the lasers emitted from the second emission regions Q2 and Q3 can be diffused and homogenized by the second diffuser 107 and then directed towards the second beam combiner 104.

[0059] A diffuser can homogenize the incident laser and adjust its divergence angle. In this embodiment, the first diffuser 106 diffuses the incident laser less than the second diffuser 107, thus the divergence angle of the laser emitted from the first diffuser 106 can be close to that of the laser emitted from the second diffuser 107. This ensures higher consistency in the spot size of each color laser, better mixing effect, and higher uniformity of each color laser, resulting in a better display effect of the projected image formed by the mixed laser.

[0060] Optionally, the diffuser may include multiple parallel-arranged micro-strip prisms, the cross-section of which may be triangular. The larger the apex angle of the prism, the greater the diffusion degree of the incident light. The apex angle refers to the angle furthest from the diffuser in the triangular cross-section of the micro-strip prism. In the embodiments of this application, the apex angle of each micro-strip prism in the first diffuser 106 may be smaller than the apex angle of each micro-strip prism in the second diffuser 107, and the arrangement density of the micro-strip prisms in the first diffuser 106 may be greater than the arrangement density of the micro-strip prisms in the second diffuser 107.

[0061] It should be noted that, Figure 13Taking an example where both diffusers are located between the laser 101 and the dimming mirror group 102, the laser emitted from the first sub-region of the first light-emitting region Q1 and the second sub-region of the second light-emitting region Q2 in the laser 101 can be homogenized by the two diffusers and then directed towards the first dimming mirror 1021. Optionally, the two diffusers can also be located between the dimming mirror group 102 and the beam combiner; this embodiment does not illustrate the projection light source in this case. In this case, the laser emitted from the second dimming mirror 1022 can be homogenized by the two diffusers before being directed towards the first beam combiner 103 and the second beam combiner 104.

[0062] In this embodiment, the first diffuser 106 and the second diffuser 107 are arranged independently as an example. Optionally, the two diffusers can also be two parts of a larger diffuser.

[0063] Optionally, the positions of the first diffuser 106 and the second diffuser 107 can be fixed and remain stationary relative to the laser 101. Alternatively, when the laser 101 emits light, at least one of the first diffuser 106 and the second diffuser 107 can move relative to the laser 101. For example, the diffuser can move back and forth within a certain range in a first direction, or it can move back and forth within a certain range in a second direction, or it can rotate or vibrate, or it can flip back and forth within a certain angle range. If the diffuser rotates, the axis of rotation can be located at the center of the diffuser, or it can deviate from the center to a certain extent. The range of positional change of the diffuser can be small, ensuring that the laser emitted by the laser 101 can enter the diffuser no matter where the diffuser moves.

[0064] In this embodiment, the first diffuser 106 and the second diffuser 107 are both flat, meaning the light-incident surface and the light-exit surface of the diffuser can be parallel. Optionally, the diffuser can also be wedge-shaped, and the light-incident surface and the light-exit surface of the diffuser may not be parallel. In this embodiment, both the first diffuser 106 and the second diffuser 107 are transmissive diffusers.

[0065] It should be noted that the above-described method of setting a light-uniforming component between the laser 101 and the beam combiner can also be used in other projection light sources. For example, this method can also be used in projection light sources in related technologies, and the embodiments of this application are not limited thereto.

[0066] Typically, in a projection light source, a diffuser is also provided in the optical path after the various colors of laser emitted from laser 101 are mixed, to homogenize the mixed laser colors. Optionally, when the projection light source 10 is provided with a compound eye lens 105 or a first diffuser 106 and a second diffuser 107 as described above, the diffuser in the optical path after the various colors of laser are mixed may not be necessary, thus simplifying the structure of the projection light source and facilitating its miniaturization. Alternatively, a diffuser may still be provided in the optical path after the various colors of laser are mixed to further homogenize the mixed laser colors.

[0067] The following description, with reference to the accompanying drawings, illustrates the arrangement of the diffuser in the optical path of the projection light source 10 after the mixing of various colors of laser light. The diffuser arrangement described below can be used in any of the above-mentioned projection light sources 10, as described in the embodiments of this application. Figure 3 Based on the projection light source 10 shown, we will introduce the arrangement of the diffuser in the optical path after the various colors of lasers are mixed.

[0068] Figure 14 This is a schematic diagram of another projection light source provided in another embodiment of this application. Figure 15 This is a schematic diagram of the structure of a projection light source provided in another embodiment of this application. For example... Figure 14 and Figure 15 As shown, the projection light source 10 may further include at least one diffuser, which is located on the transmission path of the laser emitted from the first beam combiner 103 and the second beam combiner 104. For example, the at least one diffuser may be located on the side of the first beam combiner 103 away from the second beam combiner 104. Figure 14 and Figure 15 The illustrations all assume that the at least one diffuser includes two diffusers, namely a third diffuser 108 and a fourth diffuser 109. Optionally, the at least one diffuser may also include only one diffuser; this case is not illustrated in the embodiments of this application.

[0069] Optionally, each of the at least one diffuser can diffuse the incident laser light more strongly along the fast axis than along the slow axis. Since the divergence angle of the laser light along the fast axis can be smaller than that along the slow axis when it strikes the diffuser (e.g., the divergence angle along the slow axis can be greater than 1 degree, while the divergence angle along the fast axis can be less than 1 degree), the present embodiment makes the diffusion of the diffuser stronger along the fast axis. This allows the divergence angles of the laser light along the fast and slow axes to be closer after passing through the diffuser, resulting in a smaller aspect ratio of the laser spot and better meeting the shape requirements of the laser emitted by the projection light source.

[0070] In this embodiment, each of the third diffuser 108 and the fourth diffuser 109 can satisfy at least one of the following conditions: the diffuser is a reflective diffuser or a transmissive diffuser; the diffuser is wedge-shaped or flat; and the diffuser remains stationary, or is used to translate within the target range, or is used to rotate along the target direction, or is used to flip within the target angle range. The range of position movement of the diffuser during movement can be small to avoid moving outside the laser irradiation range. Either the third diffuser 108 or the fourth diffuser 109 can be implemented according to any combination of these three conditions. For example, the diffuser can be a flat reflective diffuser that can flip back and forth within a 1-degree range; or the diffuser can be a wedge-shaped transmissive diffuser that can move back and forth within a certain range in the second direction; or the diffuser can be a flat transmissive diffuser that rotates clockwise around its center axis. Various other optional implementations of the diffuser are also possible, which will not be listed in this embodiment.

[0071] For example, such as Figure 14 As shown, the third diffuser 108 can be a reflective diffuser, and the fourth diffuser 109 can be a transmissive diffuser, both of which are flat. The second beam combiner 104, the first beam combiner 103, and the third diffuser 108 can be arranged sequentially along the x-direction, and the third diffuser 108 and the fourth diffuser 109 can be arranged sequentially along the z-direction. The laser emitted by the first beam combiner 103 along the x-direction can be diffused by the third diffuser 108 and reflected along the z-direction to the fourth diffuser 109. The fourth diffuser 109 further diffuses the incident laser and emits it along the z-direction. Optionally, the third diffuser 108 can rotate back and forth within a range of 1 or 2 degrees in the plane containing the x and z directions. During this process, the laser emitted by the third diffuser 108 will have a displacement in the x-direction, thus the laser emitted by the third diffuser 108 can have a more random phase, which can reduce the speckle effect of the projected image formed by the laser.

[0072] like Figure 15As shown, both the third diffuser 108 and the fourth diffuser 109 can be transmission diffusers. The third diffuser 108 is wedge-shaped, and the fourth diffuser 109 is flat. The second beam combiner 104, the first beam combiner 103, the third diffuser 108, and the fourth diffuser 109 can be arranged sequentially along the x-direction. The laser emitted from the first beam combiner 103 along the x-direction can be diffused sequentially by the third diffuser 108 and the fourth diffuser 109, and then emitted along the x-direction. Optionally, the third diffuser 108 rotates around its center axis. The third diffuser 108 is wedge-shaped, and the laser emitted from it can be biased towards the wider part of the diffuser 108. During the rotation of the third diffuser 108, the position of the laser emitted from it can continuously move in the circumferential direction, thus allowing the laser emitted from it to have a more random phase, which can reduce the speckle effect of the projected image formed by the laser.

[0073] In this embodiment, the projection light source 10 may further include a light-diffusing component 110. This light-diffusing component serves as the light-emitting component of the projection light source 10 and is located at the end of the optical path in the projection light source 10. The light-diffusing component can collect and homogenize the laser light before directing it towards the subsequent modulation optical path, facilitating subsequent image projection.

[0074] like Figure 14 and Figure 15 As shown, the homogenizing component 110 can be a compound eye lens. The third diffuser 108 and the fourth diffuser 109 can both be located between the beam combiner and the compound eye lens. Optionally, the distance between the diffuser and the compound eye lens can be relatively large, such as the distance between the fourth diffuser 109 and the compound eye lens being greater than 10 mm. This allows the laser to travel a longer distance from the diffuser to the compound eye lens, thus expanding the laser spot to a certain extent. Since the optical expansion of the incident laser by the compound eye lens is the integral of the area and the incident angle, the compound eye lens emits more laser light and achieves better homogenization of the laser beam.

[0075] Figure 16 This is a schematic diagram of another projection light source provided in a further embodiment of this application. For example... Figure 16 As shown, the homogenizing component 110 in the projection light source 10 can also be a light guide. In this case, a converging lens 111 can be provided before the homogenizing component 110 to focus the laser light to the inlet of the light guide. The third diffuser 108, the converging lens 111, the fourth diffuser 109, and the light guide 110 can be arranged sequentially. Optionally, the third diffuser 108 and the fourth diffuser 109 can both be located in the optical path before the converging lens 111; this embodiment does not limit this. The length direction of the light guide inlet can be parallel to the slow axis of the laser (i.e., the slow axis of the incident laser), and the width direction can be parallel to the fast axis of the laser to ensure that the laser spot formed at the light guide inlet matches the shape of the inlet.

[0076] In summary, in the projection light source provided in this application embodiment, the dimming lens assembly can adjust the laser emitted from the first sub-region at one end of the first light-emitting region and the laser emitted from the second sub-region at the same end of the second light-emitting region so that they are directed from the side of the third light-emitting region away from the second light-emitting region towards the first and second beam combiners, respectively. In this way, the laser originating from the second light-emitting region can be positioned on both sides of the laser emitted from the third light-emitting region when it is directed towards the second beam combiner, improving the symmetry between the lasers originating from the second and third light-emitting regions. Furthermore, after being mixed by the first and second beam combiners, the symmetry and mixing uniformity of the various colors of laser light are high, resulting in a better display effect for the projected image formed by this laser.

[0077] Figure 17 This is a schematic diagram of the structure of a projection device provided in an embodiment of this application. For example... Figure 17 As shown, the projection device may include a projection light source 10, a light valve 20, and a lens 30. The projection light source can be any of the projection light sources described above, such as... Figures 3 to 16 Any projection light source in the image. Figure 17 The projection device includes Figure 14 Take the projection light source shown as an example.

[0078] Optionally, the projection device may further include an illumination mirror assembly 40 and a total internal reflection prism 50 located between the projection light source 10 and the light valve 20. The laser emitted from the projection light source 10 can be directed towards the illumination mirror assembly 40, where it is focused and directed towards the total internal reflection prism 50; subsequently, the total internal reflection prism 50 directs the incoming laser to the light valve 20. The light valve 20 modulates the incoming laser and directs it towards the lens 30, which then projects the incoming laser to form a projected image.

[0079] For example, the light valve 20 may include multiple reflectors, each of which can be used to form a pixel in the projected image. The light valve can reflect the laser to the lens through the reflector corresponding to the pixel that needs to be displayed in a bright state according to the image to be displayed, so as to achieve the modulation of light.

[0080] For example, the lens 30 can be a telephoto lens or an ultra-short-throw lens. The lens may include multiple lenses, which can be arranged sequentially along a certain direction. The laser emitted from the light valve 20 can pass sequentially through the multiple lenses in the lens 30 to the screen, thereby realizing the projection of the laser by the lens and displaying the projected image.

[0081] In the projection device provided in this application embodiment, the symmetry of the lasers of various colors emitted by the projection light source is high, and the consistency of the light spots is good. Therefore, a projection image with good display effect can be formed based on the lasers emitted by the projection light source.

[0082] It should be noted that in the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "at least one" refers to one or more. The term "multiple" refers to two or more, unless otherwise expressly defined. In this application, the term "at least one of A and B" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, "at least one of A and B" can represent: A existing alone, A and B existing simultaneously, and B existing alone. In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent: A existing alone, A and B existing simultaneously, and B existing alone. "Approximately," "about," "basically," and "close to" mean that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and substantially achieve the technical effect.

[0083] In the accompanying drawings, the dimensions of layers and regions may be exaggerated for clarity. It is also 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 there may be intermediate layers. Similar reference numerals throughout indicate similar elements. The projection light source embodiments in this application can be referenced in conjunction with projection device embodiments.

[0084] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A projection light source, characterized in that, The projection light source includes: a laser and a dimming lens assembly. The laser can emit laser light of multiple colors and includes a base plate and a light-emitting module, with the light-emitting module located on the base plate. The light-emitting module includes an annular tube wall and multiple light-emitting chips enclosed by the tube wall. The multiple light-emitting chips are arranged with the slow axis of the emitted laser as the arrangement direction, and the multiple light-emitting chips are arranged in a row. The plurality of light-emitting chips include a first type of light-emitting chip and a second type of light-emitting chip, wherein the number and color of the first type of light-emitting chip and the second type of light-emitting chip are different; the first light-emitting module includes a plurality of first type of light-emitting chips, and the second light-emitting module includes a plurality of second type of light-emitting chips and a plurality of third type of light-emitting chips; The laser further includes a first light-emitting region, a second light-emitting region, and a third light-emitting region. The first light-emitting region is located in the region where the first type of light-emitting chip is located, the second light-emitting region is located in the region where the second type of light-emitting chip is located, and the third light-emitting region is located in the region where the third type of light-emitting chip is located. The projection light source also includes a first beam combiner and a second beam combiner. The laser emitted from the second light-emitting area is divided into two parts. When the two parts of the laser are directed toward the second beam combiner, they are located on both sides of the laser emitted from the third light-emitting area. The first sub-region in the first light-emitting region is the region where a portion of the first type of light-emitting chips located at one end of the first light-emitting module is located, and the second sub-region in the second light-emitting region is the region where a portion of the second type of light-emitting chips located at one end of the second light-emitting module is located; The dimming mirror group is located on the light-emitting side of the laser. The dimming mirror group includes a first dimming mirror and a second dimming mirror arranged sequentially along a first direction, which is parallel to the slow axis of the laser emitted by the plurality of light-emitting chips. The orthographic projection of the first dimming mirror onto the laser covers the first sub-region, and the orthographic projection of the second dimming mirror onto the laser is located outside the second light-emitting region and on the side of the second light-emitting region away from the first light-emitting region; The first dimming mirror is used to reflect the incoming laser beam toward the second dimming mirror.

2. The projection light source according to claim 1, characterized in that, The first and second dimming mirrors are tilted and parallel to each other, and the second dimming mirror and the laser are located on the same side of the first dimming mirror.

3. The projection light source according to claim 2, characterized in that, The angle between the first and second dimming mirrors and the first direction is 45 degrees.

4. The projection light source according to claim 1 or 2, characterized in that, The laser emitted from the first sub-region forms a spot on the first dimming mirror with an overall length ranging from 2.5 mm to 3.5 mm and an overall width ranging from 1.5 mm to 2.5 mm. The overall size of the spot is 3 mm * 2 mm.

5. The projection light source according to claim 1 or 2, characterized in that, Both the first and second dimming mirrors are 10 mm x 2 mm in size.

6. The projection light source according to any one of claims 3-5, characterized in that, The first and second dimming mirrors are made of metal, or the first and second dimming mirrors are coated with a reflective film.

7. The projection light source according to claim 1, characterized in that, The number of the first type of light-emitting chips is 2, and the number of the second type of light-emitting chips is 3. The first type of light-emitting chips emits blue laser light, and the second type of light-emitting chips emits green laser light.

8. A projection device, characterized in that, The projection device includes: a projection light source as described in any one of claims 1 to 7, as well as a light valve and a lens; The projection light source is used to emit laser light into the light valve, the light valve is used to modulate the emitted laser light and direct it toward the lens, and the lens is used to project the emitted laser light to form a projected image.

Images