Laser device light source and projection apparatus

Abstract

The present application discloses a laser device light source and a projection apparatus. The laser device light source comprises at least two groups of laser device units; each laser device unit comprises a laser chip array and a fast axis collimator lens arranged corresponding to the laser chip array, and the fast axis collimator lens is used for collimating a light beam emitted from the laser chip array in a fast axis direction; and the fast axis collimator lenses of at least one group of laser device units and the fast axis collimator lenses of the remaining laser device units have different focal lengths. In this way, the laser device light source of the present application can emit laser beams having different angles and different areas, so that the laser device light source can adapt to two or more kinds of projection apparatuses having different requirements.

Description

Laser light sources and projection equipment Technical Field

[0001] The present application relates to the field of laser projection display, and in particular to a laser light source and projection equipment. Background Art

[0002] In the field of projection display, semiconductor laser light sources, as light sources with high efficiency, high energy density, and a wide color gamut, have long been the mainstream solution for high-performance projection equipment. Currently, various combinations of array-packaged laser light sources are being used in projection, enabling even more compact projection machines.

[0003] However, the compatibility of optical extension with the projection machine is not taken into consideration in existing laser light sources. The collimated laser beam causes the loss of extension when the compound eye is homogenized. Since the laser beam has a single angle, the optical extension dilution caused by different compound eye homogenization is different, which limits the brightness of the projection machine and makes the projection machine design have many limitations.

[0004] Utility Model Content

[0005] In order to solve the above problems, the present application proposes a laser light source and a projection device, aiming to solve the above problems.

[0006] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a laser light source, which includes at least two groups of laser units, each laser unit includes a laser chip array and a fast-axis collimating lens arranged corresponding to the laser chip array, and the fast-axis collimating lens is used to collimate the light beam emitted from the laser chip array in the fast-axis direction; wherein, the fast-axis collimating lens of at least one group of laser units has a different focal length from the fast-axis collimating lenses of the remaining laser units.

[0007] The laser light source further includes a light source control device connected to each laser unit, and the light source control device is used to control at least one group of laser units to operate so that the light output angles of the laser light source are different.

[0008] The light source control device is used to control at least part of the laser chips in the laser chip array to operate so that the light emission angles of the laser light sources are different.

[0009] The light source control device includes a first control unit, which controls at least part of the laser unit to turn on based on the light spot requirement; and / or the light source control device includes a second control unit, which controls at least part of the laser chips in the laser unit to turn on based on the light source brightness requirement.

[0010] The laser light source includes a first laser unit, a second laser unit and a third laser unit. The focal length of the fast-axis collimating lens of the first laser unit and the focal length of the fast-axis collimating lens of the second laser unit are smaller than the focal length of the fast-axis collimating lens of the third laser unit. In response to the light spot formed by the light beams emitted by the first laser unit and the second laser unit not meeting the light spot requirement, the first control unit controls the third laser unit to operate.

[0011] The second control unit controls the laser chip array in the laser unit to operate by gradually turning on the chips from the middle to both sides based on the light source brightness requirement.

[0012] The laser light source further includes a plurality of first light deflecting elements, each of which is arranged on the optical path of the corresponding laser unit and is used to reflect the light beam emitted by the laser chip array in the laser unit to the corresponding fast axis collimating lens for collimation.

[0013] Among them, the laser light source is provided with a light outlet, and the laser light beam emitted by the laser unit within the range of the light outlet passes through the corresponding fast-axis collimating lens and then exits through the light outlet. A second light deflection component is provided on the optical path of each laser unit far away from the light outlet, and the second light deflection component is used to guide the laser light beam of each laser unit far away from the light outlet after passing through the corresponding fast-axis collimating lens into the range of the light outlet, so that the laser light beam of the laser unit far away from the light outlet is emitted along the light outlet from between the optical axes of the laser units within the range of the light outlet.

[0014] Among them, the second light deflecting member includes a reflective element and a first dichroic element arranged parallel to each other. The reflective element is arranged on the optical axis of the corresponding laser unit away from the light outlet, and the first dichroic element is arranged between the optical axes of the laser units within the light outlet range and is located on the reflected light path of the reflective element.

[0015] The laser light source includes a first laser unit, a second laser unit and a third laser unit. The first laser unit and the second laser unit are arranged within the light outlet range, and the third laser unit is arranged away from the light outlet. A reflective element is correspondingly arranged on the optical axis of the third laser unit. The first dichroic element is arranged at a central position between the optical axes of the first laser unit and the second laser unit and is located on the reflected light path of the reflective element.

[0016] Among them, at least two groups of laser units include a first laser unit and a second laser unit, the first laser unit is arranged within the light outlet range, and the second laser unit is arranged away from the light outlet, and the focal length of the fast axis collimating lens of the second laser unit is greater than the focal length of the fast axis collimating lens of the first laser unit.

[0017] Among them, the laser light source is provided with a light outlet, and the laser light source also includes a beam combining element and multiple third light deflecting elements arranged parallel to each other. The beam combining element is arranged on the optical path of a laser unit at the light outlet, and each third light deflecting element is correspondingly arranged on the optical path of the remaining laser units, and is used to reflect the laser light beam emitted by the corresponding laser unit to the beam combining element and the laser light beam emitted by other laser units that is transmitted through the third light deflecting element. The beam combining element is used to combine the laser light beams of all laser units and emit them along the light outlet.

[0018] The laser light source includes a red laser unit, a green laser unit and a blue laser unit, and the focal length of the fast axis collimating lens of the red laser unit is smaller than the focal lengths of the fast axis collimating lenses of the green laser unit and the blue laser unit.

[0019] In order to solve the above technical problems, another technical solution adopted in this application is: providing a projection device, which includes the above-mentioned laser light source.

[0020] The projection device further includes a first light homogenizing device and a controller, and the controller is used to control at least part of the laser chips in at least part of the laser chip array in the laser light source to operate to match the light receiving angle of the first light homogenizing device.

[0021] In which, the laser chip arrays of all laser units are laser chips of the same color, and the projection device also includes a second dichroic element, a fluorescent projection module and a projection module; the fluorescent projection module and the projection module are arranged on both sides of the second dichroic element, and the laser beam emitted by the laser light source is homogenized by the first light homogenizing device and incident on the second dichroic element; the second dichroic element reflects the laser beam to the fluorescent projection module, the fluorescent projection module absorbs the laser beam and generates a corresponding fluorescent beam and transmits it through the second dichroic element to the projection module; the projection module performs projection based on the fluorescent beam; wherein, the controller is connected to the fluorescent projection module and the laser light source, and is used to obtain the light receiving angle of the first light homogenizing device based on the fluorescent projection module and control at least part of the laser chips in the laser chip array in at least part of the laser light source to work to match the light receiving angle of the first light homogenizing device.

[0022] The fluorescent projection module includes a first lens, a second lens, and a color wheel. The laser beam reflected by the second dichroic element passes through the first lens and the second lens and is incident on the color wheel. The color wheel receives the laser beam and generates a fluorescent beam. The fluorescent beam then passes through the first lens, the second lens, and the second dichroic element and is incident on the projection module.

[0023] Among them, the projection module includes a second light homogenizing device, a relay lens, a display chip, a first prism, a second prism and a projection lens; among them, the fluorescent light beam is incident on the relay lens after passing through the second light homogenizing device, and is incident on the first prism after passing through the relay lens, and is reflected by the first prism to the display chip. The display chip receives the light beam to form an image beam, and the image beam is emitted to the projection lens through the first prism and the second prism.

[0024] In which, the laser chip array of the laser unit is a heterochromatic laser chip, and the projection device also includes a projection module, which includes a relay lens, a display chip, a first prism, a second prism and a projection lens; wherein, the laser beam is incident on the relay lens after passing through the first light homogenizing device, and is incident on the first prism after passing through the relay lens, and is reflected onto the display chip through the first prism. The display chip receives the light beam to form an image beam, and the image beam is emitted to the projection lens through the first prism and the second prism; wherein, the controller is connected to the laser light source, and is used to control at least part of the laser chips in the laser chip array in the laser light source to work based on the light receiving angle of the first light homogenizing device to match the light receiving angle of the first light homogenizing device.

[0025] The beneficial effects of the present application are as follows: Unlike the prior art, the laser light source of the present application includes at least two groups of laser units, each of which includes a laser chip array and a fast-axis collimating lens corresponding to the laser chip array. The fast-axis collimating lens is used to collimate the light beam emitted from the laser chip array in the fast-axis direction; wherein, the fast-axis collimating lens of at least one group of laser units has a different focal length than the fast-axis collimating lenses of the remaining laser units. In this way, the laser light source of the present application can emit laser beams of different angles and different areas, thereby enabling the laser light source to adapt to two or more projection devices with different requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

[0027] FIG1 is a schematic diagram of a planar optical path of a first embodiment of a laser light source of the present application;

[0028] FIG2 is a schematic diagram of a planar optical path of a second embodiment of a laser light source of the present application;

[0029] FIG3 is a schematic diagram of the three-dimensional structure of a second embodiment of the laser light source of the present application;

[0030] FIG4 is a schematic diagram of a planar optical path of a third embodiment of a laser light source of the present application;

[0031] FIG5 is a schematic structural diagram of a fourth embodiment of a laser light source of the present application;

[0032] FIG6 is a schematic structural diagram of a fifth embodiment of the laser light source of the present application;

[0033] FIG7 is a schematic structural diagram of a first embodiment of a projection device of the present application;

[0034] FIG8 is a schematic structural diagram of the second embodiment of the projection device of the present application

[0035] FIG9 is a schematic structural diagram of a third embodiment of the projection device of the present application;

[0036] FIG10 is a schematic diagram of a fluorescent spot on a color wheel of a projection device of the present application;

[0037] FIG11 is a schematic structural diagram of a fourth embodiment of the projection device of the present application;

[0038] FIG12 is a schematic structural diagram of a fifth embodiment of the projection device of the present application;

[0039] FIG13 is a schematic structural diagram of a sixth embodiment of the projection device of the present application;

[0040] FIG14 is a schematic structural diagram of the seventh embodiment of the projection device of the present application. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0043] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0044] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] In the field of projection display, laser light sources, as high-efficiency, high-energy-density, and high-color-gamut light source devices, have long been the mainstream solution for high-performance projection equipment. Currently, various combinations of array-packaged laser light sources are used in projection, enabling even more compact projection equipment. When designing the optical engine for a projection device, the light source's etendue is typically deduced from the fluorescent projection module to derive the parameters of the homogenizer, with the homogenizer serving as the intermediate boundary of the projection device. For example, in a projection device that excites fluorescence using a blue laser, the fluorescence etendue on the color wheel can be deduced from the fluorescent projection module, thereby deriving the parameters of the light source's homogenizer. The homogenizer's incident end is adapted to the blue laser's outgoing beam, while its output end is adapted to the collection lens and color wheel. The homogenizer can be considered another form of optical fiber. Therefore, different projection devices use different homogenizers as their medium, and the utilization rate of the homogenizer's etendue directly reflects the degree of dilution of the light source's etendue.

[0046] However, the laser products used in existing projection equipment have very narrow laser beam angles. The spot distribution of laser light sources from different array packages before entering the homogenizer is discontinuous, and their etendue differs by at least four orders of magnitude from that of the fluorescent projection module. This laser packaging leads to low etendue utilization of the homogenizer, restricting further brightness improvements. Furthermore, because existing laser light sources have a single beam angle, the resulting etendue dilution varies for different projection devices. This often results in wasted or insufficient laser light sources when designing for brightness and color gamut matching. The number of laser light sources is also limited by the size of the projection engine, resulting in numerous limitations in the performance design of the engine.

[0047] For example, the light sources currently used in projection equipment are array laser light sources composed of multiple laser chips. Compared with single laser light sources, they have higher power and smaller size, which promotes the miniaturization of projection equipment. Although these laser packages make the light sources of projection equipment more integrated by considering the number and type of chips, these laser light sources do not take into account the compatibility of optical expansion with the optical machine of the projection equipment. The collimated laser beam will cause expansion loss when it passes through the homogenizer. Since the laser light source emits a single beam angle, the optical expansion dilution caused by different homogenizers will be different, which limits the brightness of the projection equipment and makes the design of projection equipment have many limitations.

[0048] In order to solve the above problems, the present application first proposes a laser light source. The laser light source of the present application includes at least two groups of laser units, each laser unit includes a laser chip array and a fast-axis collimating lens arranged corresponding to the laser chip array, and the fast-axis collimating lens is used to collimate the light beam emitted from the laser chip in the fast-axis direction; wherein, the fast-axis collimating lens of at least one group of laser units has a different focal length from the fast-axis collimating lenses of the remaining laser units.

[0049] The fast-axis collimating lens is the most important optical component in the laser unit's beam shaping system. Made of high-quality glass and featuring a cylindrical surface, it exhibits high transmittance and excellent collimation properties. The laser chip array is composed of multiple laser chips arranged in a stripe pattern. The number of laser chips in the laser chip array that emit light can be controlled by a light source control device. This light source control device can be configured to control the operation of a corresponding number of laser chips in the laser chip array based on the brightness of the light source required by the projection device.

[0050] Please refer to Figure 1, which is a schematic diagram of a planar optical path of a first embodiment of a laser light source of the present application. As shown in Figure 1, taking the laser light source 100 in Figure 1 as an example, the laser light source 100 of this embodiment includes two groups of laser units, namely a first laser unit 10 and a second laser unit 20. The first laser unit 10 and the second laser unit 20 each include a laser chip array 11 and a fast-axis collimating lens 12 corresponding to the laser chip array. The focal length of the fast-axis collimating lens 12 in the first laser unit 10 is different from the focal length of the fast-axis collimating lens 12 in the second laser unit 20.

[0051] In this embodiment, the focal length f1 of the fast-axis collimating lens 12 in the first laser unit 10 is smaller than the focal length f2 of the fast-axis collimating lens 12 in the second laser unit 20 .

[0052] Preferably, the laser unit is located at the focal point of the corresponding fast-axis collimating lens. Optionally, the laser unit can also be located before or after the focal point of the corresponding fast-axis collimating lens in the optical path. In this case, the fast-axis collimating lens can still play a certain collimating role, but the collimation effect is somewhat degraded compared to when it is located at the focal point.

[0053] In this embodiment, the laser light source 100 of this embodiment can emit laser beams at different angles by turning on the first laser unit 10 with a smaller focal length, or turning on the second laser unit 20 with a larger focal length, or turning on the first laser unit 10 and the second laser unit 20 at the same time. If the color of the laser chip array 11 in the first laser unit 10 and the color of the laser chip array 11 in the second laser unit 20 are different, the laser light source 100 of this embodiment can also emit laser beams in different color ranges. Therefore, compared with the prior art, the laser light source 100 of this embodiment can adapt to two or more projection devices with different requirements.

[0054] Optionally, based on the above embodiments, in this embodiment, the laser light source further includes a plurality of first light deflecting elements, each of which is arranged in the optical path of the corresponding laser unit, and is used to reflect the light beam emitted by the laser chip array in the laser unit to the corresponding fast axis collimating lens for collimation.

[0055] Taking the laser light source 100 including two groups of laser units in Figure 1 as an example, as shown in Figure 1, the first laser unit 10 and the second laser unit 20 are both provided with a first light deflecting member 13 in their optical paths. The first light deflecting member 13 is used to reflect the light beams emitted by the laser chip arrays 11 in the first laser unit 10 and the second laser unit 20 to the corresponding fast-axis collimating lens 12 for collimation.

[0056] In this embodiment, the first light deflecting member 13 can be set as a reflector to reflect the light beams emitted by the laser chip array 11 in the first laser unit 10 and the second laser unit 20 to the corresponding fast-axis collimating lens 12 for collimation, and in this embodiment, the number of first light deflecting members 13 is consistent with the number of laser units in the laser light source 100.

[0057] In other embodiments, if the fast axis collimating lens 12 is disposed on the optical path of the optical axis of the laser chip array 11 , the first light deflecting element 13 may be omitted.

[0058] Optionally, in other embodiments, the laser light source is further provided with a light outlet, and the laser light beam emitted by the laser unit within the range of the light outlet passes through the corresponding fast-axis collimating lens and then exits through the light outlet, and a second light deflecting member is provided on the optical path of each laser unit away from the light outlet, for guiding the laser light beam of each laser unit away from the light outlet after passing through the corresponding fast-axis collimating lens into the range of the light outlet, so that the laser light beam of the laser unit away from the light outlet is emitted along the light outlet from between the optical axes of the laser units within the range of the light outlet.

[0059] Among them, the second light deflecting member includes a reflective element and a first dichroic element arranged parallel to each other. The reflective element is arranged on the optical axis of the corresponding laser unit away from the light outlet, and the first dichroic element is arranged between the optical axes of the laser units within the light outlet range and is located on the reflected light path of the reflective element.

[0060] The laser light source includes a first laser unit, a second laser unit and a third laser unit. The first laser unit and the second laser unit are arranged within the light outlet range, and the third laser unit is arranged away from the light outlet. A reflective element is correspondingly arranged on the optical axis of the third laser unit. The first dichroic element is arranged at a central position between the optical axes of the first laser unit and the second laser unit and is located on the reflected light path of the reflective element.

[0061] Please refer to Figures 2 and 3. Figure 2 is a schematic diagram of the planar optical path of the second embodiment of the laser light source of the present application, and Figure 3 is a schematic diagram of the three-dimensional structure of the second embodiment of the laser light source of the present application. As shown in Figures 2 and 3, taking the laser light source in Figures 2 and 3 as an example, the laser light source 100 of this embodiment includes three groups of laser units, namely a first laser unit 10, a second laser unit 20, and a third laser unit 30. The first laser unit 10, the second laser unit 20, and the third laser unit 30 each include a laser chip array 11 and a fast-axis collimating lens 12 corresponding to the laser chip array 11. Among them, the focal length of the fast-axis collimating lens 12 of the third laser unit 30 is different from the focal lengths of the fast-axis collimating lenses 12 of the first laser unit 10 and the second laser unit 20. In this embodiment, the relationship between the focal length f1 of the fast-axis collimating lens 12 in the first laser unit 10, the focal length f2 of the fast-axis collimating lens 12 in the second laser unit 20, and the focal length f3 of the fast-axis collimating lens 12 in the third laser unit 30 is: f1 = f2 <f3。

[0062] As shown in FIG2 , the laser light source of this embodiment is provided with a light outlet 60. The first laser unit 10 and the second laser unit 20 are located within the range of the light outlet 60 of the laser light source 100. That is, the laser beams emitted by the first laser unit 10 and the second laser unit 20 can be directly emitted through the light outlet 60 after passing through their respective fast-axis collimating lenses 12. Because the third laser unit 30 is located away from the light outlet 60, a second light deflection member 31 is required in the optical path of the third laser unit 30. In this case, the laser beam emitted by the third laser unit 30, after being collimated by its corresponding fast-axis collimating lens 12, needs to be reflected by its corresponding second light deflection member 31, so that the laser beam emitted by the third laser unit 30 is emitted along the light outlet 60 between the optical axes of the first laser unit 10 and the second laser unit 20, which are located within the range of the light outlet 60. That is, in the laser light source 100 of this embodiment, the beams of the three laser units are emitted along the light outlet 60 on different axes.

[0063] Specifically, in this embodiment, the second light deflector 31 includes a reflective element 311 and a first dichroic element 312, which are arranged parallel to each other. In this embodiment, the reflective element 311 can be a reflector, and the first dichroic element 312 can be a dichroic mirror. The reflective element 311 is disposed on the optical axis of the corresponding third laser unit 30, which is away from the light outlet. The first dichroic element 312 is disposed between the optical axes of the first laser unit 10 and the second laser unit 20, which are within the range of the light outlet 60, and is located in the reflected light path of the reflective element 311.

[0064] Preferably, the first dichroic element 312 can be positioned at a central position between the optical axes of the first laser unit 10 and the second laser unit 20 within the light outlet 60 and located on the reflected light path of the reflective element. It should be noted that the central position is not an absolute middle position and may have some deviation. If the first laser unit 10, the second laser unit 20, and the third laser unit 30 are light sources of different colors, positioning the first dichroic element 312 at the central position can make the resulting laser beam color more uniform.

[0065] In other embodiments, if the first laser unit 10 , the second laser unit 20 and the third laser unit 30 are light sources of the same color, a dichroic mirror may not be used, and other elements such as a polarizer may be used to reflect the laser beams.

[0066] In other embodiments, if multiple laser units are provided away from the light outlet, a corresponding number of second light deflecting elements 31 need to be provided, and the corresponding first two-way elements 312 can be evenly spaced between the optical axes of the laser units within the light outlet 60.

[0067] Optionally, at least two groups of laser units include a first laser unit and a second laser unit, the first laser unit is arranged within the light outlet range, the second laser unit is arranged away from the light outlet, and the focal length of the fast axis collimating lens of the second laser unit is greater than the focal length of the fast axis collimating lens of the first laser unit.

[0068] Please refer to Figure 1. As shown in Figure 1, the first laser unit 10 is set within the range of the light outlet 60, the second laser unit 20 is set away from the light outlet 60, and the focal length of the fast-axis collimating lens 12 of the second laser unit 20 is greater than the focal length of the fast-axis collimating lens 12 of the first laser unit 10.

[0069] In other embodiments, if the laser light source 100 includes multiple laser units, the focal length of the fast-axis collimating lens in the laser unit farther away from the light outlet 60 is larger. This setting can make the laser beam formed by the laser light source 100 smaller in size after light combination.

[0070] Optionally, in other embodiments, the laser light source is provided with a light outlet, and the laser light source further includes a beam combining element and a plurality of third light deflecting elements arranged parallel to each other, the beam combining element is arranged on the optical path of a laser unit at the light outlet, and each third light deflecting element is correspondingly arranged on the optical path of the remaining laser units, and is used to reflect the laser light beam emitted by the corresponding laser unit to the beam combining element, and the beam combining element is used to combine the laser light beams of all laser units and emit them along the light outlet.

[0071] Please refer to Figure 4, which is a schematic diagram of the planar optical path of the third embodiment of the laser light source of the present application. The laser light source 100 of this embodiment is also provided with a light outlet 60. Taking the laser light source in Figure 4 as an example, the laser light source 100 of this embodiment also includes three groups of laser units, namely the first laser unit 10, the second laser unit 20 and the third laser unit 30. The first laser unit 10, the second laser unit 20 and the third laser unit 30 also include a laser chip array 11 and a fast-axis collimating lens 12 corresponding to the laser chip array 11. The focal length of the fast-axis collimating lens 12 of the first laser unit 10 is different from the focal length of the fast-axis collimating lens 12 of the second laser unit 20 and the third laser unit 30. Among them, in this embodiment, the relationship between the focal length f1 of the fast-axis collimating lens 12 in the first laser unit 10, the focal length f2 of the fast-axis collimating lens 12 in the second laser unit 20 and the focal length f3 of the fast-axis collimating lens 12 in the third laser unit 30 is: f1 <f2=f3。

[0072] Among them, the laser light source 100 of this embodiment further includes a beam combining element 50 and two third light deflecting elements 40. The beam combining element 50 is disposed on the optical path of the first laser unit 10 at the light output port 60. The two third light deflecting elements 40 are respectively disposed on the optical paths of the second laser unit 20 and the third laser unit 30, and are configured to reflect the laser beams emitted by the second laser unit 20 and the third laser unit 30 to the beam combining element 50. The beam combining element 50 is configured to combine the laser beams of the first laser unit 10, the second laser unit 20, and the third laser unit 30 and then emit them along the light output port 60. That is, in this embodiment, the beams of the three laser units are coaxially emitted along the light output port 60.

[0073] Optionally, the laser light source includes a red laser unit, a green laser unit, and a blue laser unit. The focal length of the fast axis collimating lens of the red laser unit is less than the focal lengths of the fast axis collimating lenses of the green laser unit and the blue laser unit.

[0074] Please refer to FIG. 4. As shown in FIG. 4, if the laser light source 100 is a heterochromatic light source, the first laser unit 10, the second laser unit 20, and the third laser unit 30 need to be set as laser units of different colors. However, since the fast axis divergence angle of the red laser chip is greater than the fast axis divergence angles of the green laser chip of the green laser unit and the blue laser chip of the blue laser unit. Since the fast axis divergence angle of the red laser chip is greater than the fast axis divergence angles of the blue and green lasers, the homogenizing effect of the laser beam after collimation with the same focal length through the homogenizing device is poor. Therefore, in this embodiment, the first laser unit 10 is set as a red laser chip, the second laser unit 20 is set as a green laser chip, and the third laser unit 30 is set as a blue laser chip. Since the relationship between the focal length f1 of the fast axis collimating lens 12 in the first laser unit 10, the focal length f2 of the fast axis collimating lens 12 in the second laser unit 20, and the focal length f3 of the fast axis collimating lens 12 in the third laser unit 30 is: f1 < f2 = f3. Such a setting can enable the laser spots incident on the homogenizing device of the first laser unit 10, the second laser unit 20, and the third laser unit 30 to have sufficient homogenizing times, resulting in a better homogenizing effect.

[0075] Optionally, please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a fourth embodiment of the laser light source of the present application. Based on any of the above embodiments, in this embodiment, the laser light source 100 further includes a light source control device 70. The light source control device 70 is connected to each laser unit, and the light source control device 70 is configured to control at least one group of laser units to operate so that the output light angles of the laser light source are different.

[0076] In other embodiments, the light source control device 70 can also be used to control at least some of the laser chips in the laser chip array 11 to operate so that the output light angles of the laser light source 100 are different.

[0077] Optionally, in this embodiment, the light source control device 70 includes a first control unit 71. Here, the first control unit 71 controls at least some of the laser units to turn on based on the spot requirement. The laser light source 100 includes a first laser unit 10, a second laser unit 20, and a third laser unit 30. The relationship between the focal lengths f1 of the fast-axis collimating lenses 12 in the first laser unit 10, the focal length f2 of the fast-axis collimating lenses 12 in the second laser unit 20, and the focal length f3 of the fast-axis collimating lenses 12 in the third laser unit 30 is: f1 = f2 < f3. When the spot formed by the beams emitted by the first laser unit 10 and the second laser unit 20 does not meet the spot requirement, the first control unit 71 controls the third laser unit 30 to operate.

[0078] As shown in FIG. 5, taking the control of the laser light source 100 in FIG. 2 as an example, in this embodiment, when the spot formed by the beams emitted by the first laser unit 10 and the second laser unit 20 does not meet the spot requirement, that is, when the spot area formed by the beams emitted by the first laser unit 10 and the second laser unit 20 is small, there will be a phenomenon that the filling of the center of the light homogenizing device by the beams emitted by the first laser unit 10 and the second laser unit 20 is not sufficient. At this time, it is necessary to control the third laser unit 30 to operate. By controlling the number of laser chips turned on in the third laser unit 30, the spot formed by the beam emitted by the third laser unit 30 can just fill the unfilled area, thereby further improving the light homogenizing effect of the light homogenizing device. Optionally, please refer to FIG. 6. FIG. 6 is a schematic structural diagram of a fifth embodiment of the laser light source of the present application. As shown in FIG. 6, the light source control device 70 includes a second control unit 72. The second control unit 72 controls at least some of the laser chips in the laser unit to turn on based on the light source brightness requirement.

[0079] Among them, the second control unit 72 controls the laser chip array in the laser unit to control the laser chips to operate in a manner of increasing the number of turned-on chips from the middle to both sides based on the light source brightness requirement.

[0080] As shown in FIG6 , taking the control of the laser light source 100 in FIG4 as an example, in this embodiment, the number of laser chips in operation is determined by the brightness of the light source required by the projection device using the laser light source 100. In the laser chip array 11, the number of laser chips in operation can be increased by gradually turning on the laser chips from the center to both sides. This ensures that the optical axis of the laser beam emitted from the light outlet 60 after the laser unit is collimated by the fast-axis collimating lens 12 does not deviate, and also enables the light homogenizing device (not shown) located at the light outlet 60 to have a better light homogenizing effect. In this embodiment, the light source control device 70 matches the projection light engines of different brightness by controlling the number of laser chips in the laser chip array 11 in operation. There are multiple combinations of light sources with the same brightness. For example, n1 laser chips in the laser chip array 11 of the first laser unit 10 and n2 laser chips in the laser chip array 11 of the second laser unit 20 can be turned on simultaneously, or only n3 laser chips in the laser chip array 11 of the third laser unit 30 can be turned on, where n3=n1+n2; or m1 laser chips in the laser chip array 11 of the first laser unit 10, m2 laser chips in the laser chip array 11 of the second laser unit 20, and m3 laser chips in the laser chip array 11 of the third laser unit 30 can be turned on simultaneously, where n3=n1+n2=m1+m2+m3.

[0081] Optionally, the present application further proposes a projection device. Please refer to Figure 7, which is a structural schematic diagram of the first embodiment of the projection device of the present application. As shown in Figure 7, the projection device 200 of this embodiment includes the laser light source 100 of any of the above embodiments.

[0082] Optionally, as shown in Figure 7, the projection device 200 also includes a first light homogenizing device 210 and a controller 250, and the controller 250 is used to control at least part of the laser chips in at least part of the laser chip array in the laser light source 100 to work to match the light collection angle of the first light homogenizing device 210.

[0083] Optionally, please refer to Figure 8, which is a structural schematic diagram of the first embodiment of the projection device of the present application. As shown in Figure 8, if the laser chip arrays 11 of all laser units in the laser light source 100 are laser chips of the same color, the projection device 200 also includes a second dichroic element 220, a fluorescent projection module 230 and a projection module 240; the fluorescent projection module 230 and the projection module 240 are arranged on both sides of the second dichroic element 220, and the laser beam emitted by the laser light source 100 is homogenized by the first homogenizer 210 and is incident on the second dichroic element 220; the second dichroic element 220 reflects the laser beam to the fluorescent projection module 230, the fluorescent projection module 230 absorbs the laser beam and generates a corresponding fluorescent beam and transmits the dichroic element 220 to the projection module 240; the projection module 240 performs projection based on the fluorescent beam.

[0084] Among them, the controller 250 is connected to the fluorescent projection module 230, and is used to obtain the light receiving angle of the first light homogenizing device 210 based on the fluorescent projection module 230 and control at least part of the laser chips in the laser chip array in the laser light source 100 to work to match the light receiving angle of the first light homogenizing device 210.

[0085] As shown in FIG8 , in this embodiment, the fluorescent projection module 230 includes a first lens 233 , a second lens 232 , and a color wheel 231 . The laser beam reflected by the second dichroic element 220 passes through the first lens 233 and the second lens 232 and is incident on the color wheel 231 . The color wheel 231 receives the laser beam and generates a fluorescent beam. The fluorescent beam then transmits through the first lens 233 , the second lens 232 , and the second dichroic element 220 and is incident on the projection module 240 .

[0086] The projection module 240 includes a second light homogenizing device 241, a relay lens 242, a display chip 243, a first prism 244, a second prism 245 and a projection lens 246; the fluorescent light beam is incident on the relay lens 242 after passing through the second light homogenizing device 241, and then is incident on the first prism 244 after passing through the relay lens 242. It is reflected by the first prism 244 to the display chip 243. The display chip 243 receives the light beam to form an image beam, and the image beam is emitted to the projection lens 246 through the first prism 244 and the second prism 245; among them, the relay lens 242 is used to control the position of the light beam and expand its focusing range.

[0087] In one application scenario, taking the laser chip as a blue laser chip as an example, the laser light source 100 of this embodiment can control at least part of the laser chips in at least part of the laser chip array to work as described above, that is, by controlling the laser units with fast collimating lenses of different focal lengths to work, so as to match the uniform light devices with different light collection angles.

[0088] In this embodiment, the projection device 200 can infer the size of the fluorescent spot on the color wheel 231 from the optical etendue of the fluorescent projection module 230, and the light collection angle of the first light homogenizer 210 can be further inferred from the combined focal length of the first lens 233 and the second lens 232. Therefore, it can be seen that the first light homogenizer 210 of the projection devices 200 with different optical etendues has different light collection angles. In this embodiment, as described above, the laser light source 100 includes at least two groups of laser units, wherein the fast-axis collimating lens of at least one group of laser units has a different focal length from the fast-axis collimating lenses of the remaining laser units. In this embodiment, the controller 250 of the laser light source 100 can control the laser light source 100 to activate laser units with different focal lengths to match the first light homogenizer 210 with different light collection angles.

[0089] Optionally, please refer to Figure 9, which is a structural schematic diagram of the third embodiment of the projection device of the present application. As shown in Figure 9, the projection device 200 of this embodiment has an additional polarization device 247 compared with the projection device 200 of the embodiment of Figure 6. The polarization device 247 is arranged between the second light homogenizing device 241 and the relay lens 242.

[0090] [Corrected 09.12.2024 in accordance with Rule 91] Please refer to Figure 10, which is a schematic diagram of a fluorescent spot on the color wheel of the projection device of the present application. The fluorescent spot on the color wheel 231 of the projection device 200 in the embodiment of Figure 8 is shown in Figure 10(a), which is a rectangular uniform spot close to 16:9. In the projection device 200 in the embodiment of Figure 7, the projection device 200 in the embodiment of Figure 9 is additionally provided with a polarizer 247. Due to the dilution of the optical etendue caused by the polarizer 247, the fluorescent spot on the color wheel 231 in the embodiment of Figure 7 is close to a square, as shown in Figure 10(b).

[0091] Here, assume that the laser spot area of ​​the laser light source 100 incident on the first light homogenizing device 210 in the embodiment of FIG8 is S1, and the laser beam angle is a1. In the embodiment of FIG9 , the laser spot area of ​​the laser light source 100 incident on the first light homogenizing device 210 is S2, and the laser beam angle is a2. The projection devices 200 of the embodiments of FIG8 and FIG9 , with the exception of the polarizer 247, have the same fluorescent projection module 230, i.e., S1 = S2. Due to the influence of the PCS device, the shape and size of the fluorescent spot on the color wheel 231 are different. In this case, the light collection angle of the first light homogenizing device 210 can be calculated based on the first lens 233 and the second lens 232. Therefore, it can be determined that the laser beam angle a1 in the embodiment of FIG8 is greater than the laser beam angle a2 in the embodiment of FIG9 .

[0092] That is, in the projection device 200 of the embodiment of FIG. 8, when the light collection angle of the first light homogenizing device 210 is the larger angle a1, the laser unit with a smaller focal length of the fast collimating lens can be turned on by the controller 250. In the projection device 200 of the embodiment of FIG. 9, when the light collection angle of the first light homogenizing device 210 is the smaller angle a2, the laser unit with a larger focal length of the fast collimating lens is turned on by the controller 250. The laser light source of the projection device 200 takes the laser light source 100 in FIG. 2 as an example. In the embodiment of FIG. 2, the relationship between the focal lengths f1 of the fast axis collimating lenses 12 in the first laser unit 10, the focal lengths f2 of the fast axis collimating lenses 12 in the second laser unit 20, and the focal lengths f3 of the fast axis collimating lenses 12 in the third laser unit 30 is: f1 = f2 < f3. When the light collection angle of the first light homogenizing device 210 is the larger angle a1, the light source control device 70 is controlled to turn on the first laser unit 10 and the second laser unit 20 with smaller focal lengths of the fast axis collimating lenses 12 in the embodiment of FIG. 2; when the light collection angle of the first light homogenizing device 210 is the smaller angle a2, the light source control device 70 is controlled to turn on the third laser unit 30 with a larger focal length of the fast axis collimating lens 12 in the embodiment of FIG. 2.

[0093] In addition, the focal length of the fast axis collimating lens 12 in the laser unit not only affects the incident beam angle of the laser beam before entering the first light homogenizing device 210, but also affects the incident spot area of the laser beam before entering the first light homogenizing device 210. In this embodiment, when laser units with different focal lengths are selected for operation and the number of laser chips turned on in the laser chip array is the same, the incident spot area of the laser beam before entering the first light homogenizing device 210 will be different.

[0094] Taking the laser light source 100 in Figure 2 as an example of the laser light source of the projection device 200, when the light receiving angle of the first light homogenizing device 210 is a larger angle a1, the first laser unit 10 and the second laser unit 20 with a smaller focal length of the fast-axis collimating lens 12 in the embodiment of Figure 2 are turned on through the controller 250; when the light receiving angle of the first light homogenizing device 210 is a smaller angle a2, the third laser unit 30 with a larger focal length of the fast-axis collimating lens 12 in the embodiment of Figure 2 is turned on through the controller 250. Because different focal lengths will affect the incident spot area of ​​the laser beam before entering the first light homogenizing device 210, in order to make the sum of the laser spot areas S1 emitted by the laser light source 100 in the embodiment of Figure 8 just equal to the laser spot area S2 of the laser light source 100 in the embodiment of Figure 9, at this time, in the embodiment of Figure 8, the laser light source 100 needs to increase the number of turned-on laser chips in the laser chip array 11 in the first laser unit 10 and the second laser unit 20, so as to ensure that the first light homogenizing device 210 has a better light homogenizing effect. Among them, in the laser light source 100 in the embodiment of Figure 8, it is necessary to ensure that the number of turned-on laser chips in the laser chip array 11 in the first laser unit 10 and the second laser unit 20 is the same.

[0095] In other embodiments, when the light receiving angle of the first light homogenizing device 210 is a larger angle a1, the three groups of laser units of the laser light source 100 in the embodiment of Figure 2 can also be turned on simultaneously. Since S1 is the sum of the laser spot areas emitted by the first laser unit 10 and the second laser unit 20, the center of the first light homogenizing device 210 may not be fully filled. Therefore, the third laser unit 30 is turned on at the same time. By controlling the number of laser chips in the laser chip array 11 in the third laser unit 30 that are turned on, the laser beam spot emitted by the laser light source 100 can just make up for the unfilled area, thereby further improving the light homogenizing effect of the first light homogenizing device 210.

[0096] In the projection device 200 of this embodiment, the laser light source 100 of this embodiment is designed with a laser unit having a fast-axis collimating lens 12 with different focal lengths, and then controls at least part of the laser chips in the laser chip array 11 to operate through the light source control device 70, thereby adjusting the laser spot size and the laser beam angle of the laser light source 100, enabling the projection device 200 to flexibly adapt to different projection requirements.

[0097] Optionally, please refer to Figure 11, which is a structural schematic diagram of the fourth embodiment of the projection device of the present application. As shown in Figure 11, if the laser chip array 11 of the laser unit is a heterochromatic laser chip, the projection device 200 also includes a projection module 240, and the projection module 240 includes a relay lens 242, a display chip 243, a first prism 244, a second prism 245 and a projection lens 246; the laser beam is incident on the relay lens 242 after passing through the first light homogenizing device 210, and is incident on the first prism 244 after passing through the relay lens 242, and is reflected by the first prism 244 to the display chip 243. The display chip 243 receives the light beam to form an image beam, and the image beam is emitted to the projection lens 246 through the first prism 244 and the second prism 245; the relay lens 242 is used to control the position of the light beam and expand its focusing range. The controller 250 is connected to the laser light source 100 and is used to control at least part of the laser chips in the laser chip array in the laser light source 100 to work based on the light receiving angle of the first light homogenizing device 210 to match the light receiving angle of the first light homogenizing device 210 .

[0098] That is, if the laser chip array 11 of the laser unit is composed of laser chips of different colors, the fluorescent projection module 230 does not need to be provided.

[0099] In this embodiment, the laser light source 100 in this embodiment can be the laser light source 100 in any of the above embodiments.

[0100] In one application scenario, please refer to FIG12 , which is a schematic diagram of the structure of the fifth embodiment of the projection device of the present application. As shown in FIG12 , the laser light source 100 of this embodiment includes three groups of laser units, wherein the first laser unit 10 is a blue laser chip, the second laser unit 20 is a green laser chip, and the third laser unit 30 is a red laser chip. In this embodiment, the focal length f1 of the fast-axis collimating lens 12 in the first laser unit 10, the focal length f2 of the fast-axis collimating lens 12 in the second laser unit 20, and the focal length f3 of the fast-axis collimating lens 12 in the third laser unit 30 are related by: f1 = f2 > f3. Furthermore, the laser beams of the first laser unit 10, the second laser unit 20, and the third laser unit 30 have similar structures to those of the embodiment of FIG2 , and their laser beams are all emitted along different axes along the light outlet. In this embodiment, because the fast-axis divergence angle of the red laser chip is greater than that of the blue-green laser, the red laser chip laser beam, after being collimated by the fast-axis collimating lens 12 of the same focal length and then passing through the first homogenizing device 210, has a poorer homogenization effect than the blue-green laser beam. In this embodiment, the focal length f3 of the fast-axis collimating lens 12 in the third laser unit 30 is set to be greater than the focal length f1 of the fast-axis collimating lens 12 in the first laser unit 10 and the focal length f2 of the fast-axis collimating lens 12 in the second laser unit 20. This ensures that all laser beams incident on the first homogenizing device 210 have a sufficient number of homogenization times, thereby improving the homogenization effect. In addition, in the projection device 200 of this embodiment, the laser light source 100 of this embodiment can also control the number of laser chips in the laser chip array 11 in the first laser unit 10, the second laser unit 20, and the third laser unit 30 through the light source control device, thereby combining a variety of white light sources with different color gamuts and different brightness.

[0101] Optionally, please refer to Figure 13, which is a structural schematic diagram of the sixth embodiment of the projection device of the present application. In this embodiment, the first laser unit 10, the second laser unit 20 and the third laser unit 30 can be arranged as in the embodiment of Figure 4, and the laser light beams of the three groups of laser units are combined and then emitted from the light outlet.

[0102] Optionally, since the focal lengths of the fast collimating lenses of the first and second laser units are the same, refer to FIG. 14 , which is a schematic structural diagram of a seventh embodiment of the projection device of the present application. As shown in FIG. 14 , the first and second laser units can be combined into a single fourth laser unit 80 via a beam splitter. The laser chips in the laser chip array 11 of the fourth laser unit 80 include a blue laser chip and a green laser chip.

[0103] Based on the embodiments of Figures 11 to 14, in these embodiments, the laser light source 100 can be designed with a laser unit having a fast-axis collimating lens 12 with different focal lengths, and then the light source control device 70 can control at least some laser chips in the laser chip array 11 of different colors to operate, so that the laser light source 100 can directly emit white light sources with different color gamuts and different brightness, so that the projection device 200 can flexibly adapt to various different projection requirements.

[0104] The above description is merely an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A laser light source, characterized in that: It comprises at least two groups of laser units, each of which comprises a laser chip array and a fast axis collimating lens arranged corresponding to the laser chip array, and the fast axis collimating lens is used to collimate the light beam emitted from the laser chip array in the fast axis direction; The fast axis collimating lenses of at least one group of the laser units have a focal length different from that of the fast axis collimating lenses of the remaining laser units.

2. The laser light source according to claim 1, characterized in that: It also includes a light source control device, which is connected to each of the laser units and is used to control at least one group of laser units to work so that the light output angles of the laser light sources are different.

3. The laser light source according to claim 2, characterized in that: The light source control device is used to control at least part of the laser chips in the laser chip array to work so that the light emission angles of the emitted light of the laser light source are different.

4. The laser light source according to claim 3, characterized in that: The light source control device comprises a first control unit, and the first control unit controls at least part of the laser units to turn on based on the light spot requirement; and / or The light source control device comprises a second control unit, and the second control unit controls at least part of the laser chips in the laser unit to turn on based on the light source brightness requirement.

5. The laser light source according to claim 4, characterized in that: The laser light source comprises a first laser unit, a second laser unit and a third laser unit, the focal length of the fast axis collimating lens of the first laser unit and the focal length of the fast axis collimating lens of the second laser unit being smaller than the focal length of the fast axis collimating lens of the third laser unit; In response to the light spot formed by the light beams emitted by the first laser unit and the second laser unit not meeting the light spot requirement, the first control unit controls the third laser unit to operate.

6. The laser light source according to claim 4, characterized in that: The second control unit controls the laser chip array in the laser unit to operate by gradually turning on the chips from the middle to both sides based on the light source brightness requirement.

7. The laser light source according to claim 1, characterized in that: It also includes a plurality of first light deflection elements, each of which is disposed on the optical path of the corresponding laser unit and is used to reflect the light beam emitted by the laser chip array in the laser unit to the corresponding fast axis collimating lens for collimation.

8. The laser light source according to claim 1, characterized in that: The laser light source is provided with a light outlet, and the laser light beam emitted by the laser unit within the range of the light outlet passes through the corresponding fast-axis collimating lens and then exits through the light outlet, and a second light deflection component is provided on the optical path of each laser unit far away from the light outlet, and the second light deflection component is used to guide the laser light beam of each laser unit far away from the light outlet after passing through the corresponding fast-axis collimating lens into the range of the light outlet, so that the laser light beam of the laser unit far away from the light outlet is emitted along the light outlet from between the optical axes of the laser units within the range of the light outlet.

9. The laser light source according to claim 8, characterized in that: The second light deflection member includes a reflective element and a first dichroic element which are arranged parallel to each other. The reflective element is arranged on the optical axis of the corresponding laser unit away from the light outlet. The first dichroic element is arranged between the optical axes of the laser units within the range of the light outlet and is located on the reflected light path of the reflective element.

10. The laser light source according to claim 9, characterized in that: The laser light source includes a first laser unit, a second laser unit and a third laser unit. The first laser unit and the second laser unit are arranged within the range of the light outlet, and the third laser unit is arranged away from the light outlet. The reflective element is correspondingly arranged on the optical axis of the third laser unit, and the first dichroic element is arranged at a central position between the optical axes of the first laser unit and the second laser unit and is located on the reflected light path of the reflective element.

11. The laser light source according to claim 8, characterized in that: The at least two groups of laser units include a first laser unit and a second laser unit, the first laser unit is arranged within the light outlet range, the second laser unit is arranged away from the light outlet, and the focal length of the fast axis collimating lens of the second laser unit is greater than the focal length of the fast axis collimating lens of the first laser unit.

12. The laser light source according to claim 1, characterized in that: The laser light source is provided with a light outlet, and the laser light source also includes a beam combining element and a plurality of third light deflecting elements which are arranged in parallel with each other. The beam combining element is arranged on the light path of one of the laser units located at the light outlet, and each of the third light deflecting elements is correspondingly arranged on the light path of the remaining laser units, and is used for reflecting the laser light beam emitted by the corresponding laser unit to the beam combining element and transmitting the laser light beams emitted by other laser units which pass through the third light deflecting elements. The beam combining element is used for combining the laser light beams of all the laser units and emitting them along the light outlet.

13. The laser light source according to claim 12, characterized in that: The laser light source comprises a red laser unit, a green laser unit and a blue laser unit, and the focal length of the fast axis collimating lens of the red laser unit is smaller than the focal lengths of the fast axis collimating lenses of the green laser unit and the blue laser unit.

14. A projection device, characterized in that: A laser light source comprising any one of claims 1-12.

15. The projection device according to claim 14, characterized in that: The projection device further includes: a first light homogenizing device and a controller, wherein the controller is used to control at least part of the laser chips in at least part of the laser chip array in the laser light source to operate to match the light receiving angle of the first light homogenizing device.

16. The projection device according to claim 15, characterized in that: The laser chip arrays of all the laser units are laser chips of the same color. The projection device further comprises a second dichroic element, a fluorescent projection module and a projection module; the fluorescent projection module and the projection module are arranged on both sides of the second dichroic element. The laser light beam emitted by the laser light source is homogenized by the first light homogenizer and incident on the second dichroic element; the second dichroic element reflects the laser light beam to the fluorescent projection module, the fluorescent projection module absorbs the laser light beam and generates a corresponding fluorescent light beam and transmits the second dichroic element to the projection module; the projection module performs projection based on the fluorescent light beam; Among them, the controller is connected to the fluorescent projection module and the laser light source, and is used to obtain the light receiving angle of the first light homogenizing device based on the fluorescent projection module and control at least part of the laser chips in the laser chip array in the laser light source to work to match the light receiving angle of the first light homogenizing device.

17. The projection device according to claim 16, characterized in that: The fluorescent projection module includes a first lens, a second lens and a color wheel; The laser beam reflected by the second dichroic element is incident on the color wheel through the first lens and the second lens. The color wheel receives the laser beam and generates the fluorescent beam. The fluorescent beam then transmits the first lens, the second lens and the second dichroic element and is incident on the projection module.

18. The projection device according to claim 16, characterized in that: The projection module includes a second light homogenizing device, a relay lens, a display chip, a first prism, a second prism and a projection lens; Among them, the fluorescent light beam is incident on the relay lens after passing through the second light homogenizing device, and is incident on the first prism after passing through the relay lens, and is reflected to the display chip by the first prism. The display chip receives the light beam to form an image beam, and the image beam is emitted to the projection lens through the first prism and the second prism.

19. The projection device according to claim 15, characterized in that: The laser chip array of the laser unit is a heterochromatic laser chip, and the projection device further includes a projection module, which includes a relay lens, a display chip, a first prism, a second prism and a projection lens; The laser beam is incident on the relay lens after passing through the first light homogenizing device, and is incident on the first prism after passing through the relay lens, and is reflected on the display chip by the first prism. The display chip receives the beam to form an image beam, and the image beam is emitted to the projection lens through the first prism and the second prism; The controller is connected to the laser light source and is used to control at least part of the laser chips in the laser chip array in the laser light source to work based on the light receiving angle of the first light homogenizing device to match the light receiving angle of the first light homogenizing device.

Images