CN218957014U - Laser light source and laser projection device - Google Patents

Abstract

The embodiment of the application discloses a laser light source and laser projection equipment, belongs to the technical field of laser projection. In this embodiment of the present application, in two lasers of a laser light source, the same light emitting module is arranged in a central symmetry manner, so that there is no need to add a mirror group, and the second laser emitted by the second light emitting module of the first laser and the third laser emitted by the second light emitting module of the second laser can uniformly mix light when transmitted to the homogenizing component through respective light mixing components, and the third laser emitted by the second light emitting module of the first laser and the second laser emitted by the second light emitting module of the second laser can also uniformly mix light when transmitted to the homogenizing component through respective light mixing components. Therefore, by the laser light source provided by the embodiment of the application, the volume of the laser light source can be reduced and the cost of the laser light source can be reduced under the condition of ensuring the uniformity among red laser, green laser and blue laser emitted by the three-color laser.

Description

Laser light source and laser projection device

Technical Field

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

Background

Laser projection devices such as laser televisions currently typically employ a three-color laser as the light source. Trichromatic lasers have the advantage of high brightness and high color gamut. Since the three-color laser can emit red laser light, green laser light and blue laser light at the same time, how to ensure uniformity among the red laser light, the green laser light and the blue laser light emitted by the three-color laser is a hot spot of current research.

Disclosure of Invention

The embodiment of the application provides a laser light source and laser projection equipment, which can reduce the volume of the laser light source and reduce the cost of the laser light source under the condition of ensuring the uniformity among red laser, green laser and blue laser emitted by a three-color laser. The technical scheme is as follows:

in one aspect, a laser light source is provided, the laser light source includes a first laser, a second laser, a first light combining component, a second light combining component, and a light homogenizing component;

the first laser and the second laser comprise a first light-emitting module and a second light-emitting module, the first light-emitting module in the first laser and the first light-emitting module in the second laser are arranged in a central symmetry mode along a first direction, the second light-emitting module in the first laser and the second light-emitting module in the second laser are arranged in a central symmetry mode along the first direction, the first light-emitting module is used for emitting first laser, and the second light-emitting module is used for emitting second laser and third laser;

the first light combining component is positioned at the light emitting side of the first laser, the second light combining component is positioned at the light emitting side of the second laser, the first light combining component is used for combining laser emitted by the first light emitting module and the second light emitting module in the first laser and guiding the laser emitted by the first light emitting module and the second light emitting module to the light homogenizing component along the first direction, and the second light combining component is used for combining laser emitted by the first light emitting module and the second light emitting module in the second laser and guiding the laser emitted by the first light emitting module and the second light emitting module to the light homogenizing component along the first direction;

the light homogenizing component is used for homogenizing and combining the light beams emitted by the first light combining component and the second light combining component.

Optionally, the first light emitting module includes a plurality of first type light emitting chips, and the second light emitting module includes a plurality of second type light emitting chips and a plurality of third type light emitting chips;

the first light-emitting chips, the second light-emitting chips and the third light-emitting chips are all arranged along a second direction, the second light-emitting chips are located in a first light-emitting area of the second light-emitting module, and the third light-emitting chips are located in a second light-emitting area of the second light-emitting module;

the first light emergent region in the first laser and the first light emergent region in the second laser are arranged along the first direction, the second light emergent region in the first laser and the second light emergent region in the second laser are arranged along the first direction, and the second direction is perpendicular to the first direction;

the first type of light emitting chip is used for emitting the first laser, the second type of light emitting chip is used for emitting the second laser, and the third type of light emitting chip is used for emitting the third laser.

Optionally, the first light combining component includes a first reflector and a first dichroic plate;

the first reflecting mirror is positioned on the light emitting side of the first light emitting module of the first laser, and the first dichroic sheet is positioned on the light emitting side of the second light emitting module of the first laser;

the first reflecting mirror is used for reflecting first laser emitted by the first light emitting module of the first laser to the first dichroic sheet, and the first dichroic sheet is used for transmitting the first laser to the light homogenizing module and reflecting second laser and third laser emitted by the second light emitting module of the first laser to the light homogenizing module.

Optionally, the first dichroic plate is a parameter adjustable lens.

Optionally, the second light combining component includes a second mirror and a second dichroic plate;

the second reflecting mirror is positioned on the light-emitting side of the second light-emitting module of the second laser, and the second dichroic sheet is positioned on the light-emitting side of the first light-emitting module of the second laser;

the second reflecting mirror is used for reflecting second laser light and third laser light emitted by the second light emitting module of the second laser to the second dichroic sheet, and the second dichroic sheet is used for transmitting the second laser light and the third laser light to the light homogenizing component and reflecting first laser light emitted by the first light emitting module of the second laser to the light homogenizing component.

Optionally, the second reflecting mirror is a lens with adjustable parameters.

Optionally, the light homogenizing component includes a fly eye lens, a diffusion wheel and a light pipe, the fly eye lens is located at the light emitting side of the first light combining component and the second light combining component, the diffusion wheel is located at the light emitting side of the fly eye lens, and the light pipe is located at the light emitting side of the diffusion wheel;

the fly-eye lens is used for uniformly projecting the received laser beam to the diffusion wheel, and the diffusion wheel is used for uniformly projecting the received laser beam to the light guide pipe after combining the received laser beams.

Optionally, the fly-eye lens includes a first fly-eye area and a second fly-eye area, the light beam emitted by the first light combining component is projected to the first fly-eye area, and the light beam emitted by the second light combining component is projected to the second fly-eye area;

the sizes of the microlenses in the first compound eye region and the second compound eye region are different.

Optionally, a distance between the first laser and the fly-eye lens is greater than a distance between the second laser and the fly-eye lens;

the size of the micro lens in the first laser projection area is a first reference value multiple of the sizes of the micro lenses in the second laser and third laser projection areas in the slow axis direction of the first compound eye area;

the size of the micro lens in the first laser projection area is a second reference value multiple of the sizes of the micro lenses in the second laser and third laser projection areas in the slow axis direction of the second compound eye area;

the first reference value is smaller than the second reference value.

In another aspect, a laser projection device is provided, the laser projection device comprising the laser light source, the light valve and the projection lens described above.

The beneficial effects that technical scheme that this application embodiment provided include at least:

in this embodiment of the present application, in two lasers of a laser light source, the same light emitting module is arranged in a central symmetry manner, so that there is no need to add a mirror group, and the second laser emitted by the second light emitting module of the first laser and the third laser emitted by the second light emitting module of the second laser can uniformly mix light when transmitted to the homogenizing component through respective light mixing components, and the third laser emitted by the second light emitting module of the first laser and the second laser emitted by the second light emitting module of the second laser can also uniformly mix light when transmitted to the homogenizing component through respective light mixing components. Therefore, by the laser light source provided by the embodiment of the application, the volume of the laser light source can be reduced and the cost of the laser light source can be reduced under the condition of ensuring the uniformity among red laser, green laser and blue laser emitted by the three-color laser.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a laser light source 000 according to an embodiment of the present application;

fig. 2 is a schematic diagram of an arrangement manner of a laser according to an embodiment of the present application;

FIG. 3 is a schematic diagram of another arrangement of lasers according to an embodiment of the present disclosure;

fig. 4 is a schematic structural view of another laser light source 000 provided in an embodiment of the present application;

fig. 5 is a schematic structural view of another laser light source 000 according to an embodiment of the present application;

fig. 6 is a schematic diagram of a laser spot in a compound eye area according to an embodiment of the present application;

FIG. 7 is a schematic illustration of the dimensions of a microlens in a compound eye area according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a laser projection device according to an embodiment of the present application.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Before explaining the embodiment of the present application in detail, an application scenario of the embodiment of the present application is explained.

With the development of photoelectric technology, requirements for projection pictures of laser projection devices are increasing. In order to ensure the display brightness of the projection picture, a laser is generally adopted to provide illumination for the laser projection equipment, and a laser beam emitted by the laser has the advantages of good monochromaticity and high brightness, so that the laser is an ideal light source.

In addition, lasers include monochromatic lasers and trichromatic lasers. A monochromatic laser is a laser that uses a single blue laser beam to excite both yellow and green phosphors on a fluorescent color wheel to produce three laser beams of red, green and blue. The three-color laser adopts red, green and blue laser to emit red, green and blue laser beams respectively. Since the monochromaticity of the laser beam emitted by any one of the three-color lasers is good, the emitted red, green and blue laser beams can be ensured to have little stray light only by selecting a laser with a proper wavelength. Therefore, the three-color laser has the advantage of high color gamut and high brightness compared to the single-color laser, which makes it increasingly widely used in laser projection devices.

The following explains a laser light source and a laser projection apparatus provided in the embodiments of the present application.

Fig. 1 is a schematic structural diagram of a laser light source 000 according to an embodiment of the present application. As shown in fig. 1, the laser light source 000 includes a first laser 100, a second laser 200, a first light combining component 300, a second light combining component 400, and a light homogenizing component 500.

The first laser 100 and the second laser 200 each include a first light emitting module 10 and a second light emitting module 20. Fig. 2 is a schematic diagram of an arrangement manner of a laser according to an embodiment of the present application. It should be noted that, the display size of the laser in fig. 2 and the display size of the laser in fig. 1 are not drawn in different scale, and for convenience of description, the display size of the laser in fig. 2 is larger than the display size of the laser in fig. 1, but the two lasers are corresponding to each other in the same laser light source.

As shown in fig. 2, the first light emitting modules 10 in the first laser 100 and the first light emitting modules 10 in the second laser 200 are arranged in a central symmetrical manner along a first direction, which is exemplified by an X direction in fig. 2, and the second light emitting modules 20 in the first laser 100 and the second light emitting modules 20 in the second laser 200 are arranged in a central symmetrical manner along the first direction. In other words, the first and second lasers 100 and 200 are arranged in a manner that they exhibit central symmetry in the first direction.

The first light emitting module 10 is used for emitting a first laser light, and the second light emitting module 20 is used for emitting a second laser light and a third laser light. The first laser may be illustratively a red laser, the second laser may be illustratively a blue laser, and the second laser may be illustratively a green laser. Alternatively, the first laser, the second laser, and the third laser may be other types of three-color lasers, which are not illustrated here.

As shown in fig. 1, the first light combining component 300 is located on the light emitting side of the first laser 100, and the second light combining component 400 is located on the light emitting side of the second laser 200. The first light combining component 100 is configured to combine the laser light emitted by the first light emitting module 10 and the second light emitting module 20 in the first laser 100 and guide the combined laser light to the light homogenizing component 500 along the first direction, and the second light combining component 400 is configured to combine the laser light emitted by the first light emitting module 10 and the second light emitting module 20 in the second laser 200 and guide the combined laser light to the light homogenizing component 500 along the first direction. The light homogenizing component 500 is configured to uniformly combine the light beams emitted by the first light combining component and the second light combining component.

Because the first laser and the second laser respectively comprise a first light-emitting module and a second light-emitting module, and the first light-emitting module and the second light-emitting module are respectively used for emitting lasers with different colors, each laser corresponds to one light combination component so as to combine three types of lasers emitted by the first light-emitting module and the second light-emitting module.

Moreover, as shown in fig. 2, since the same light emitting modules are arranged in a central symmetry manner in the two lasers, there is no need to add a mirror group, the second laser light emitted by the second light emitting module of the laser 1 and the third laser light emitted by the second light emitting module of the laser 2 can reach the same position of the homogenizing component to uniformly mix light when transmitted to the homogenizing component through the respective light mixing components, and the third laser light emitted by the second light emitting module of the laser 1 and the second laser light emitted by the second light emitting module of the laser 2 can also reach the same position of the homogenizing component to uniformly mix light when transmitted to the homogenizing component through the respective light mixing components. Therefore, by the laser light source provided by the embodiment of the application, the volume of the laser light source can be reduced and the cost of the laser light source can be reduced under the condition of ensuring the uniformity among red laser, green laser and blue laser emitted by the three-color laser.

In some embodiments, as shown in fig. 3, the first light emitting module includes a plurality of first type light emitting chips (portions shown by white filled ellipses in fig. 3), the second light emitting module includes a plurality of second type light emitting chips (portions shown by square filled ellipses in fig. 3) and a plurality of third type light emitting chips (portions shown by black filled ellipses in fig. 3). The first type of light emitting chip is used for emitting first laser, the second type of light emitting chip is used for emitting second laser, and the third type of light emitting chip is used for emitting third laser.

The first, second and third light emitting chips are arranged along a second direction, the second direction is illustrated as a Y direction shown in fig. 3, the second light emitting chips are located in a first light emitting area of the second light emitting module, and the third light emitting chips are located in a second light emitting area of the second light emitting module. The first light emitting areas in the first lasers and the second light emitting areas in the second lasers are arranged along a second direction, and the second light emitting areas in the first lasers and the first light emitting areas in the second lasers are arranged along the second direction which is perpendicular to the first direction.

Through the arrangement mode, the same light-emitting modules in the two lasers can be arranged in a central symmetry mode.

For example, the first type of light emitting chips are used for emitting red laser light, the second type of laser chips are used for emitting blue laser light, the third type of light emitting chips are used for emitting green laser light, the number of the first type of light emitting chips in each laser device can be 4, the number of the second type of light emitting chips is 2, and the number of the third type of light emitting chips is 3.

In the scenario shown in fig. 3, the No. 1 first-type light emitting chips in the first light emitting module 10 in the first laser 100 and the No. 4 first-type light emitting chips in the first light emitting module 10 in the second laser 200 are arranged in the first direction, the No. 2 first-type light emitting chips in the first light emitting module 10 in the first laser 100 and the No. 3 first-type light emitting chips in the first light emitting module 10 in the second laser 200 are arranged in the first direction, and the No. 3 first-type light emitting chips in the first light emitting module 10 in the first laser 100 and the No. 2 first-type light emitting chips in the first light emitting module 10 in the second laser 200 are arranged in the first direction, and the No. 4 first-type light emitting chips in the first light emitting module 10 in the first laser 100 and the No. 1 first-type light emitting chips in the first light emitting module 10 in the second laser 200 are arranged in the first direction.

The second type 5 light emitting chips in the second light emitting modules 20 in the first laser 100 and the third type 9 light emitting chips in the second light emitting modules 20 in the second laser 200 are arranged along the first direction, the second type 6 light emitting chips in the second light emitting modules 20 in the first laser 100 and the third type 8 light emitting chips in the second light emitting modules 20 in the second laser 200 are arranged along the first direction, the third type 7 light emitting chips in the second light emitting modules 20 in the first laser 100 and the third type 7 light emitting chips in the second light emitting modules 20 in the second laser 200 are arranged along the first direction, the third type 8 light emitting chips in the second light emitting modules 20 in the first laser 100 and the second type 6 light emitting chips in the second light emitting modules 20 in the second laser 200 are arranged along the first direction, and the third type 9 light emitting chips in the second light emitting modules 20 in the first laser 100 and the second type 5 light emitting chips in the second light emitting modules 20 in the second laser 200 are arranged along the first direction.

By the arrangement mode, the first lasers and the second lasers shown in fig. 4 can be arranged in a mode of being centrosymmetric along the first direction.

The above-described embodiments are for illustrating that the first laser and the second laser are arranged in a central symmetrical manner along the first direction. Optionally, in this embodiment of the present application, when the first light emitting module and the second light emitting module in the first laser and the second laser include light emitting chips arranged in other manners, the first laser and the second laser may be arranged in a central symmetry manner along the first direction by referring to the above implementation manner.

In addition, in some embodiments, as shown in fig. 4, the first light combining component 300 includes a first mirror 301 and a first dichroic plate 302.

The first reflecting mirror 301 is located at the light emitting side of the first light emitting module of the first laser, and the first dichroic plate 302 is located at the light emitting side of the second light emitting module of the first laser. The first reflecting mirror 301 is configured to reflect the first laser light emitted by the first light emitting module 10 of the first laser 100 to the first dichroic plate 302, where the first dichroic plate 302 is configured to transmit the first laser light to the light homogenizing module 500, and reflect the second laser light and the third laser light emitted by the second light emitting module 20 of the first laser 100 to the light homogenizing module 500.

Accordingly, as shown in fig. 4, the second light combining assembly 400 includes a second mirror 401 and a second dichroic plate 402.

Wherein the second reflecting mirror 401 is located at the light emitting side of the second light emitting module 20 of the second laser 200, and the second dichroic sheet 402 is located at the light emitting side of the first light emitting module 10 of the second laser 200. The second reflecting mirror 401 is configured to reflect the second laser light and the third laser light emitted by the second light emitting module 20 of the second laser 200 to the second dichroic sheet 402, and the second dichroic sheet 402 is configured to transmit the second laser light and the third laser light to the light homogenizing component 500, and reflect the first laser light emitted by the first light emitting module 10 of the second laser 200 to the light homogenizing component 500.

Illustratively, in the scenario where the first laser 100 and the second laser 200 are the lasers shown in fig. 3, the first laser is a red laser, the second laser is a blue laser, and the third laser is a green laser, where the first mirror 301 is configured to reflect the red laser emitted by the first light emitting module 10 in the first laser 100 to the first dichroic sheet 302, and the first dichroic sheet 302 is configured to transmit the red laser and reflect the blue laser and the green laser emitted by the second light emitting module 20 in the first laser 100. I.e. the first dichroic plate 302 is used for transmitting red laser light, reflecting blue laser light and green laser light.

Accordingly, the second reflecting mirror 401 is configured to reflect the blue laser light and the green laser light emitted from the second light emitting module 20 in the second laser 200 to the second dichroic sheet 402, and the second dichroic sheet 402 is configured to transmit the blue laser light and the green laser light and reflect the red laser light emitted from the first light emitting module 10 in the second laser 200. I.e. the second dichroic plate 402 is used for transmitting blue laser light and green laser light, reflecting red laser light.

In addition, in the laser light source shown in fig. 4, in order to further homogenize the second laser light and the third laser light, the first dichroic mirror 302 is a lens whose parameters are adjustable, and/or the second reflecting mirror 401 is a lens whose parameters are adjustable.

As shown in fig. 4, the first dichroic plate 302 is used to reflect the second laser light and the third laser light, and the second mirror 401 is used to reflect the second laser light and the third laser light, so in order to improve the uniformity of the second laser light and the third laser light that are finally transmitted to the homogenizing assembly 500, the first dichroic plate 302 and/or the second mirror 401 may be designed as a parameter-adjustable mirror. The parameter is understood to mean that the lens is adjustable for the projection and/or reflection of different types of laser light.

For example, the reflectivity of first dichroic sheet 302 to reflect green laser light and/or the reflectivity to reflect blue laser light may be adjusted. For another example, the reflectance of the second mirror 401 for reflecting the green laser light and/or the reflectance for reflecting the blue laser light may be adjusted.

The light combining assembly shown in fig. 4 is for illustration. Alternatively, in the embodiment of the present application, the first laser light emitted by the first light emitting module 10 and the second laser light and the third laser light emitted by the second light emitting module 20 may be combined in other manners.

Additionally, in some embodiments, as shown in fig. 5, a light homogenizing assembly 500 includes fly eye lens 501, diffuser 502, and light pipe 503.

The fly-eye lens 501 is located at the light emitting side of the first light combining component 300 and the second light combining component 400, the diffusion wheel 502 is located at the light emitting side of the fly-eye lens 501, and the light pipe 503 is located at the light emitting side of the diffusion wheel 502. The fly eye lens 501 is used for uniformly projecting the received laser beam to the diffusion wheel 502, and the diffusion wheel 502 is used for uniformly projecting the received laser beam to the light pipe 503 after combining the received laser beams.

The volume of the laser light source can be further reduced by the integrated design of the fly-eye lens 501.

Wherein the fly-eye lens has a limiting effect on the etendue. The fly-eye lens can make the incident angle smaller than the aperture angle of the fly-eye lens to emit laser light at the aperture angle of the fly-eye lens. In this embodiment of the application, after the laser beam of each color that the laser instrument sent passes through fly's eye lens, the divergence angle of the laser beam of different colors can all be adjusted to the aperture angle of fly's eye lens, guarantees that the facula size uniformity that each color laser formed is better, and the light mixing effect of each color laser can be better. The fly-eye lens can homogenize the injected laser, reduce the coherence between the laser, further improve the light mixing effect of the laser of each color, weaken the speckle effect of the projection picture formed based on the laser and improve the display effect of the projection picture.

As shown in fig. 5, the fly-eye lens 501 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 501 has a length on the slow axis of the incident laser light that is greater than a length on the fast axis. 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 the aperture angle in the fast axis direction. Because the divergence angle of the laser emitted to the fly-eye lens on the slow axis is larger, the fly-eye lens can ensure that the aperture angles in different directions in the fly-eye lens are matched with the divergence angles of the laser in the directions, and the aperture angle of the fly-eye lens in each direction is larger than the divergence angle of the emitted laser, so that the fly-eye lens can adjust the divergence angles of the laser of each color to be basically consistent in each direction.

In addition, as shown in fig. 5, the laser light emitted from the laser 10 and the laser 20 is projected to a different region of the fly eye lens 501. It is assumed that the area of the fly-eye lens 501 on which the light beam emitted from the first light combining element 300 is projected is referred to as a first fly-eye area, and the area of the fly-eye lens 501 on which the light beam emitted from the second light combining element 400 is projected is referred to as a second fly-eye area.

In some embodiments, the size of the microlenses in the first fly-eye area is the same as the size of the microlenses in the second fly-eye area.

Alternatively, in other embodiments, since the two lasers are each at different distances from fly-eye lens 501, the size of the laser spot projected by first laser 100 onto fly-eye lens 501 is also different from the size of the laser spot projected by second laser 200 onto fly-eye lens 501. Therefore, the size of the microlenses in the first fly-eye region and the size of the microlenses in the second fly-eye region of the fly-eye lens 501 can also be designed to be different sizes.

That is, the fly-eye lens includes a first fly-eye area and a second fly-eye area, the light beam emitted from the first light combining component is projected to the first fly-eye area, and the light beam emitted from the second light combining component is projected to the second fly-eye area. Wherein the sizes of the microlenses in the first compound eye region and the second compound eye region are different.

Illustratively, in the scenario shown in fig. 5, the distance between the first laser and the fly-eye lens is greater than the distance between the second laser and the fly-eye lens, at which time the size of the spot in the first fly-eye region is greater than the size of the spot in the second fly-eye region, as shown in fig. 6.

Accordingly, the dimensions of the microlenses in the first fly-eye area and the microlenses in the second fly-eye area can be designed as shown in fig. 7 to further improve the uniformity between the laser light emitted from the first laser 100 and the laser light emitted from the second laser 200 after passing through the fly-eye lens 501.

As shown in fig. 7, in the slow axis direction of the first compound eye region, the size of the microlens in the first laser projection region is a first reference value multiple of the sizes of the microlens in the second laser and third laser projection regions; the size of the microlens in the first laser projection region is a second reference value multiple of the sizes of the microlens in the second laser and third laser projection regions in the slow axis direction of the second fly's eye region. Wherein the first reference value is smaller than the second reference value.

For example, the first reference value is 1.2 and the second reference value is 1.6.

In the second compound eye region, since the size of the red light spot in the slow axis direction is 1.6 times that of the blue and green light, the size of the microlens in the red irradiation region is also increased by about 1.6 times that of the blue-green irradiation region in the slow axis direction of the second compound eye region. In the first compound eye region, since the size of the red light spot in the slow axis direction is 1.2 times that of the blue and green light, the size of the microlens in the red irradiation region is also increased by about 1.2 times that of the blue-green irradiation region in the slow axis direction of the second compound eye region.

Alternatively, in a scene where the first laser and the second laser are arranged in other ways, the size of the microlenses may be set as well with reference to the above arrangement.

In addition, a diffusion wheel 502 (i.e., a rotatable diffusion sheet) is located between the fly eye lens 501 and the light guide 503, and the diffusion wheel 502 can diffuse the light beam in a converging state, increase the divergence angle of the light beam, and increase the random phase. Thus, since the fly-eye lens 501 is provided in the front-end optical path, the laser beam is converged after being homogenized and is incident on the diffusion wheel 502. In this way, on the basis of homogenizing the beam by the fly eye lens 501, the laser beam is diffused and homogenized again by the diffusion wheel 502, so that the homogenizing effect of the laser beam can be enhanced, the energy ratio of the beam near the optical axis of the laser beam can be reduced, the coherence degree of the laser beam can be reduced, and the speckle phenomenon appearing on the projection picture can be improved to a greater extent.

In addition, the light guide 503 is a hollow tubular device, and light is reflected inside the light guide 503 for multiple times, so as to achieve the effect of uniform light.

Fig. 5 is used to illustrate the light homogenizing component 500 provided in the embodiments of the present application, alternatively, the light homogenizing component 500 in the embodiments of the present application may also have other structures, including a diffuser, a lens, a diffuser wheel, and a light pipe, which are not illustrated here.

In summary, in this embodiment, in two lasers of the laser source, the same light emitting module is arranged in a central symmetry manner, so that there is no need to add a mirror group, the second laser emitted by the second light emitting module of the first laser and the third laser emitted by the second light emitting module of the second laser can be uniformly combined when transmitted to the homogenizing component through respective light combining components, and the third laser emitted by the second light emitting module of the first laser and the second laser emitted by the second light emitting module of the second laser can also be uniformly combined when transmitted to the homogenizing component through respective light combining components. Therefore, by the laser light source provided by the embodiment of the application, the volume of the laser light source can be reduced and the cost of the laser light source can be reduced under the condition of ensuring the uniformity among red laser, green laser and blue laser emitted by the three-color laser.

Fig. 8 is a schematic structural diagram of a laser projection device according to an embodiment of the present application. The laser projection device may include: a laser light source 000, a lens group 01, a prism group 02, a light valve 03, and a projection lens 04. The laser light source 000 may be any of the laser light sources shown in fig. 1-5. Fig. 8 illustrates an example in which the laser projection apparatus includes the laser light source 000 shown in fig. 5.

The lens group 01 may be located on a side of the light homogenizing module 500 remote from the light modules 300 and 400, and the prism group 02 and the light valve 03 may each be located on a side of the lens group 01 remote from the light homogenizing module 500. The lens group 01 may be used to guide the laser beam emitted from the light equalizing member 500 to the prism group 02.

The prism group 02 may include: TIR (total internal reflectionprism, total internal reflection) prisms. The prism assembly 02 may be used to direct the laser beam to the light valve 03. The light valve 03 may be used to modulate the laser beam to the projection lens 04.

The light valve 03 may include a plurality of reflective sheets (not shown in the figure), each of which may be used to form a pixel in the projection screen, and the light valve 03 may reflect the laser light to the projection lens 04 by using the reflective sheet corresponding to the pixel that needs to be displayed in a bright state according to the image to be displayed, so as to implement modulation on the laser beam. By way of example, the light valve 03 may be a DMD (digital micromirror device ).

The first laser light emitted from the first laser 100 and the second and third laser light emitted from the second laser 200 may be directed to the light homogenizing unit 500 along the X-axis direction in fig. 8, the light homogenizing unit 500 may homogenize the incident laser light and then direct the homogenized laser light to the lens group 01, the lens group 01 may be used to guide the laser light emitted from the light homogenizing unit 500 to the prism group 02, the prism group 02 may be used to guide the laser light to the light valve 03, the light valve 03 may be used to modulate the laser light and then guide the modulated laser light to the projection lens 04, and the projection lens 04 may project the incident laser light to form a projection screen. The projection lens 04 may include a plurality of lenses (not shown in the figure), and the laser light emitted from the light valve 03 may sequentially pass through the plurality of lenses in the projection lens 04 to be emitted to the screen, so as to achieve projection of the laser light by the projection lens 04, and achieve display of a projection screen.

The foregoing description of the preferred embodiments is merely illustrative of the present application and is not intended to limit the embodiments of the present application, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the embodiments of the present application are intended to be included within the scope of the present application.

Claims (10)

1. The laser light source is characterized by comprising a first laser, a second laser, a first light combination component, a second light combination component and a light homogenizing component;

the first laser and the second laser comprise a first light-emitting module and a second light-emitting module, the first light-emitting module in the first laser and the first light-emitting module in the second laser are arranged in a central symmetry mode along a first direction, the second light-emitting module in the first laser and the second light-emitting module in the second laser are arranged in a central symmetry mode along the first direction, the first light-emitting module is used for emitting first laser, and the second light-emitting module is used for emitting second laser and third laser;

the first light combining component is positioned at the light emitting side of the first laser, the second light combining component is positioned at the light emitting side of the second laser, the first light combining component is used for combining laser emitted by the first light emitting module and the second light emitting module in the first laser and guiding the laser emitted by the first light emitting module and the second light emitting module to the light homogenizing component along the first direction, and the second light combining component is used for combining laser emitted by the first light emitting module and the second light emitting module in the second laser and guiding the laser emitted by the first light emitting module and the second light emitting module to the light homogenizing component along the first direction;

the light homogenizing component is used for homogenizing and combining the light beams emitted by the first light combining component and the second light combining component.

2. The laser light source of claim 1, wherein the first light emitting module comprises a plurality of first type light emitting chips and the second light emitting module comprises a plurality of second type light emitting chips and a plurality of third type light emitting chips;

the first light-emitting chips, the second light-emitting chips and the third light-emitting chips are all arranged along a second direction, the second light-emitting chips are located in a first light-emitting area of the second light-emitting module, and the third light-emitting chips are located in a second light-emitting area of the second light-emitting module;

the first light emergent region in the first laser and the first light emergent region in the second laser are arranged along the first direction, the second light emergent region in the first laser and the second light emergent region in the second laser are arranged along the first direction, and the second direction is perpendicular to the first direction;

the first type of light emitting chip is used for emitting the first laser, the second type of light emitting chip is used for emitting the second laser, and the third type of light emitting chip is used for emitting the third laser.

3. The laser light source of claim 1, wherein the first light combining component comprises a first mirror and a first dichroic plate;

the first reflecting mirror is positioned on the light emitting side of the first light emitting module of the first laser, and the first dichroic sheet is positioned on the light emitting side of the second light emitting module of the first laser;

the first reflecting mirror is used for reflecting first laser emitted by the first light emitting module of the first laser to the first dichroic sheet, and the first dichroic sheet is used for transmitting the first laser to the light homogenizing module and reflecting second laser and third laser emitted by the second light emitting module of the first laser to the light homogenizing module.

4. The laser light source of claim 3, wherein the first dichroic sheet is a parameter-tunable lens.

5. The laser light source of claim 1, wherein the second light combining component comprises a second mirror and a second dichroic sheet;

the second reflecting mirror is positioned on the light-emitting side of the second light-emitting module of the second laser, and the second dichroic sheet is positioned on the light-emitting side of the first light-emitting module of the second laser;

the second reflecting mirror is used for reflecting second laser light and third laser light emitted by the second light emitting module of the second laser to the second dichroic sheet, and the second dichroic sheet is used for transmitting the second laser light and the third laser light to the light homogenizing component and reflecting first laser light emitted by the first light emitting module of the second laser to the light homogenizing component.

6. The laser light source of claim 5 wherein the second mirror is a parameter adjustable mirror.

7. The laser light source of claim 1, wherein the light homogenizing component comprises a fly-eye lens, a diffusion wheel and a light pipe, the fly-eye lens is positioned on the light emitting side of the first light combining component and the second light combining component, the diffusion wheel is positioned on the light emitting side of the fly-eye lens, and the light pipe is positioned on the light emitting side of the diffusion wheel;

the fly-eye lens is used for uniformly projecting the received laser beam to the diffusion wheel, and the diffusion wheel is used for uniformly projecting the received laser beam to the light guide pipe after combining the received laser beams.

8. The laser light source of claim 7, wherein the fly-eye lens comprises a first fly-eye area and a second fly-eye area, the first light beam emitted by the first light combining component is projected to the first fly-eye area, and the second light beam emitted by the second light combining component is projected to the second fly-eye area;

the sizes of the microlenses in the first compound eye region and the second compound eye region are different.

9. The laser light source of claim 8, wherein a distance between the first laser and the fly-eye lens is greater than a distance between the second laser and the fly-eye lens;

the size of the micro lens in the first laser projection area is a first reference value multiple of the sizes of the micro lenses in the second laser and third laser projection areas in the slow axis direction of the first compound eye area;

the size of the micro lens in the first laser projection area is a second reference value multiple of the sizes of the micro lenses in the second laser and third laser projection areas in the slow axis direction of the second compound eye area;

the first reference value is smaller than the second reference value.

10. A laser projection device, comprising: the laser light source, light valve and projection lens of any one of claims 1 to 9.

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