Light source, optical device, related apparatus and method

Abstract

The invention discloses a light source, an optical device, a related device and a method. The light source is used for emitting laser and fluorescence mixed light beams, and the optical device can be applied to the light source. The optical device can emit a fluorescent light beam under the excitation of the first laser beam in the light source, and can inhibit the speckle of the second laser beam in the light source, so that the light source can emit a fluorescent laser mixed light beam inhibiting the speckle, the number of devices in the light source can be reduced, and the volume of the projection light source can be reduced. And the market demand of miniaturization of the projector is met.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to light sources, optical devices, and related equipment and methods. Background Art

[0002] Laser projection display technology can reproduce the rich and brilliant colors of the objective world in the most realistic way and provide stunning expressiveness. The light source is the core component of the projector, which is used to emit a mixed beam of laser and fluorescent light. However, due to the high coherence of the laser beam, when the laser emitted by the light source is projected on the screen, the interference between the beams will cause a kind of irregularly distributed bright and dark spots on the projected image, namely laser speckle. The existence of speckle seriously affects the imaging quality of the projected image, reduces the image resolution and contrast, and becomes an important obstacle to the development of laser projection display.

[0003] In order to reduce the influence of speckle noise, it is necessary to introduce a speckle elimination device into the light source, which will increase the number of devices in the light source and increase the volume of the light source, making it difficult to meet the market demand for miniaturization of projectors. Summary of the invention

[0004] The embodiments of the present application provide a light source, an optical device, related equipment and a method for reducing the number of devices in a projection light source, reducing the volume of the projection light source, and meeting the market demand for miniaturization of projectors.

[0005] In a first aspect, the present application provides an optical device. The optical device is used in a light source. The light source includes a laser, and the laser is used to emit a laser beam. The optical device includes an optical mechanism and a driving mechanism, and the driving mechanism is used to drive the optical mechanism to move. The optical mechanism includes a first area and a second area. The first area is used to receive a first laser beam in the light source and emit a fluorescent beam under the excitation of the first laser beam, and the second area is used to receive a second laser beam in the light source and weaken the coherence of the second laser beam.

[0006] The optical device can emit a fluorescent beam under the stimulation of the first laser beam in the light source, and can also suppress the speckle of the second laser beam in the light source. The fluorescent beam and the second laser beam can be combined and emitted from the light source. This is not only beneficial for the light source to emit a fluorescent laser mixed beam that suppresses speckle, but also beneficial for reducing the number of devices in the light source, reducing the volume of the projection light source, and meeting the market demand for miniaturization of projectors.

[0007] The first area and the second area are used to receive different laser beams in the light source. The incident position of the first laser beam and the incident position of the second laser beam in the optical mechanism can be located at different positions in space, which is conducive to the first area receiving the first laser beam while the second area receiving the second laser beam, thereby facilitating the optical mechanism to simultaneously emit a fluorescent beam and a second laser beam that suppresses speckle, and further facilitating the light source to emit a laser-fluorescence mixed beam with a stable wavelength, thereby optimizing the display quality of the projected image.

[0008] During the movement of the optical mechanism, the first laser beam can be incident on different positions of the first area. Accordingly, multiple positions in the first area are used to receive the first laser beam in time-sharing and emit fluorescent beams under the stimulation of the first laser beam, which is conducive to avoiding excessive heat generation and low fluorescent emission efficiency due to continuous reception of the laser beam at a local position. In order to reduce the size of the first area, the first area can be the union of multiple incident positions of the first laser beam on the optical mechanism.

[0009] During the movement of the optical mechanism, the second laser beam can be incident on different positions of the second area. Accordingly, multiple positions in the second area are used to receive the second laser beam in time-sharing and weaken the coherence of the second laser beam. Since different positions have different effects on the phase of the laser beam, this is conducive to increasing the random phase of the second laser beam in space and enhancing the effect of weakening the coherence of the second laser beam. In order to reduce the size of the second area, the second area can be the union of multiple incident positions of the second laser beam on the optical mechanism.

[0010] The first laser beam and the second laser beam may be two laser beams obtained by splitting laser light emitted by the same laser in the light source, or may come from different lasers in the light source.

[0011] The present application does not limit the trajectory of the driving mechanism driving the optical mechanism to move. For example, the driving mechanism can drive the optical mechanism to vibrate, and the first area and the second area can be rectangular areas. Alternatively, optionally, the driving mechanism is used to drive the optical mechanism to rotate around an axis, and the first area and the second area can be circular rings with the axis as the center axis. In this way, as long as the first laser beam and the second laser beam are respectively located in the first area and the second area at the incident position of the optical mechanism when the optical mechanism is stationary, it can be ensured that the first laser beam and the second laser beam are still respectively located in the first area and the second area at the incident position of the optical mechanism when the optical mechanism rotates, thereby facilitating the design of the optical path. Optionally, the first area surrounds the second area, that is, the inner diameter of the circular ring corresponding to the first area is greater than or equal to the outer diameter of the circular ring corresponding to the second area. Alternatively, the second area surrounds the first area, that is, the inner diameter of the circular ring corresponding to the second area is greater than or equal to the outer diameter of the circular ring corresponding to the first area.

[0012] Optionally, the first region includes a phosphor layer, and the phosphor layer is used to generate the fluorescent light beam under the stimulation of the first laser beam. The first region may also include other structures, for example, a reflective layer, which is used to reflect the fluorescent light beam, thereby facilitating improving the brightness of the fluorescent light beam.

[0013] Optionally, the second region includes a diffusion layer, and the diffusion layer is used to diffuse the second laser beam. The diffusion layer can be made of a diffuser or a diffuser sheet, and its surface can also be coated with a diffuser or processed with a microstructure or sandblasted.

[0014] Optionally, the optical mechanism further includes a substrate, which can be used to set the first area and the second area, and the substrate is installed together with the driving mechanism. The driving mechanism drives the first area and the second area to move by driving the substrate to move. Optionally, the substrate has an opening or a hollow portion corresponding to the first area to embed and set the first area. Optionally, the substrate has an opening or a hollow portion corresponding to the second area to embed and set the second area.

[0015] Optionally, the phosphor layer can be used as a substrate, a portion of the phosphor layer is used as the first region, a portion of the phosphor layer is used to set the second region, and a portion of the phosphor layer is used to install the driving mechanism. Alternatively, the diffusion layer can be used as a substrate, a portion of the diffusion layer is used as the second region, a portion of the diffusion layer is used to set the first region, and a portion of the diffusion layer is used to install the driving mechanism. This is conducive to simplifying the structure of the optical device.

[0016] In a second aspect, the present application provides a light source, the light source comprising a first laser, a spectrometer, an optical device and a first light combining device. The first laser is used to emit laser light. The spectrometer is arranged in the optical path of the laser, and is used to separate the laser light into a first laser beam and a second laser beam. The optical device may be an optical device introduced in the first aspect or any possible implementation of the first aspect. For example, the optical device comprises an optical mechanism and a driving mechanism, the driving mechanism is used to drive the optical mechanism to move, the first area of ​​the optical mechanism is used to receive the first laser beam and emit a fluorescent beam under the excitation of the first laser beam, and the second area of ​​the optical mechanism is used to receive the second laser beam and weaken the coherence of the second laser beam. The first light combining device is used to receive the fluorescent beam and the second laser beam emitted through the second area, and the fluorescent beam and the second laser beam emitted through the second area can be combined, so that the light source outputs a fluorescent laser mixed beam that suppresses speckle.

[0017] By arranging the above-mentioned optical device in the light source, not only can a fluorescent light beam be emitted to the first light combining device, but also a second laser light beam which is beneficial to suppressing speckle can be emitted to the first light combining device, thereby helping to reduce the number of devices in the light source, reduce the volume of the projection light source, and meet the market demand for miniaturization of projectors.

[0018] In addition, since the first area and the second area are used to receive different laser beams in the light source, the incident position of the first laser beam on the optical mechanism and the incident position of the second laser beam on the optical mechanism can be located at different positions in space, which is beneficial for the first area to receive the first laser beam while the second area receives the second laser beam, thereby facilitating the optical mechanism to simultaneously emit a fluorescent beam and a second laser beam that suppresses speckle, and further facilitating the light source to emit a laser-fluorescence mixed beam with a stable wavelength, thereby optimizing the display quality of the projected image.

[0019] Optionally, the light source may further include one or more deflection devices, and the one or more deflection devices are used to change the propagation direction of the target laser beam, and the target laser beam may be the first laser beam or the second laser beam, which is conducive to making the first laser beam and the second laser beam incident on the optical mechanism along different optical paths.

[0020] Optionally, one or more deflection devices (referred to as first deflection devices) may be provided in the optical path of the first laser beam, and one or more deflection devices (referred to as second deflection devices) may also be provided in the optical path of the second laser beam. The first deflection device may be located in the optical path of the first laser beam, and the first deflection device is used to change the propagation direction of the first laser beam so that the first laser beam is incident on the first optical device from the first direction. The second deflection device is located in the optical path of the second laser beam, and the second deflection device is used to change the propagation direction of the second laser beam so that the second laser beam is incident on the first optical device from the second direction.

[0021] In order to further improve the color gamut of the output light beam, optionally, the light source also includes a second laser, which is used to emit a third laser beam. The optical mechanism is also located in the optical path of the third laser beam. During the movement of the optical mechanism, the third laser beam can be incident on different positions of the optical mechanism, and the area in the optical mechanism for receiving the third laser beam is called the third area, and the third area is used to weaken the coherence of the third laser beam. The size of the third area is larger than the spot size of the third laser beam, and different positions of the third area are used to receive the third laser beam in time-sharing. In other words, the third area can be understood as the union of the incident positions of the third laser beam on the optical mechanism.

[0022] The first light combining device is used to combine the fluorescent light beam, the second laser light beam emitted through the second area, and the third laser light beam emitted through the third area.

[0023] Optionally, the second area and the third area are the same area on the optical mechanism, which is helpful to reduce the size of the optical mechanism.

[0024] Optionally, the second laser beam and the third laser beam are combined by a light combining device (referred to as a second light combining device) and then incident on the second area. The second light combining device is located in the optical path of the second laser beam and the third laser beam before the second area, and is used to combine the second laser beam and the third laser beam.

[0025] The second laser beam and the third laser beam can be incident on the second light combining device from different directions. The second light combining device is used to combine the second laser beam and the third laser beam incident from different directions and direct them to the second area, which is conducive to simplifying the light source design. Optionally, the second light combining device is used to transmit the second laser beam and reflect the third laser beam. Alternatively, the second light combining device is used to transmit the third laser beam and reflect the second laser beam.

[0026] Optionally, the second light combining device is the light splitting device, and the light splitting device can be reused to combine the second laser beam and the third laser beam. This is conducive to reducing the number of devices in the light source, reducing the volume of the whole device, adapting to the development trend of miniaturization of equipment, and reducing costs.

[0027] Optionally, one of the one or more deflection devices may be reused to combine the second laser beam and the third laser beam. This is beneficial to reducing the number of devices in the light source, reducing the volume of the entire device, adapting to the development trend of miniaturization of equipment, and reducing costs. Optionally, the deflection device may include a dichroic plate.

[0028] In order to ensure that the second laser beam is incident on the second area, the size of the second area is generally set to be much larger than the spot area of ​​the second laser beam. Optionally, the light source also includes a first beam shaping device, which is located in the optical path of the second laser beam before the second area and is used to converge the second laser beam, which is conducive to reducing the spot size of the second laser beam in the second area, reducing the area of ​​the second area, thereby reducing the surface area of ​​the optical mechanism, and further reducing the volume of the light source.

[0029] The first beam shaping device is used for converging the beam. The second laser beam emitted from the first beam shaping device can be a collimated beam or a converging beam. Accordingly, the first beam shaping device can be a collimating lens or a converging lens. Taking the first beam shaping device as a converging lens as an example, the spot of the second laser beam in the second area can be located at the converging point of the converging lens.

[0030] Similarly, optionally, a beam shaping device may be provided in the light source in the optical path where the third laser beam is located before the second region to reduce the spot size of the third laser beam, thereby helping to reduce the area of ​​the second region, thereby reducing the surface area of ​​the optical structure and further reducing the volume of the light source.

[0031] Similarly, optionally, a beam shaping device may be provided in the light source in the optical path before the first laser beam is located in the first region to reduce the spot size of the first laser beam, thereby facilitating reducing the area of ​​the first region, thereby reducing the surface area of ​​the optical structure and further reducing the volume of the light source.

[0032] Optionally, in order to reduce the number of components in the light source, different laser beams can reuse the same beam shaping component to reduce the size of the light spot incident on the optical mechanism.

[0033] While the second region weakens the coherence of the second laser beam, it generally also increases the divergence angle of the second laser beam. Optionally, the light source also includes a second beam shaping device, which is located in the optical path of the second laser beam between the second region and the first light combining device, and the second beam shaping device is used to collimate the second laser beam. The present application does not limit the second laser beam emitted from the second beam shaping device to a collimated beam, as long as the divergence angle of the emitted second laser beam is reduced relative to the divergence angle of the incident second laser beam. In this way, it is beneficial to reduce the size of the rear-end optical element (such as the first light combining device). The second beam shaping device can be a collimating lens or a converging lens.

[0034] Similarly, optionally, a beam shaping device may be provided in the light source in the optical path of the third laser beam between the second region and the first light combining device to reduce the divergence angle of the third laser beam, thereby facilitating the reduction of the size of the rear optical element (e.g., the first light combining device). The second beam shaping device may be a collimating lens or a converging lens.

[0035] Optionally, in order to reduce the number of components in the light source, different laser beams may reuse the same beam shaping component to reduce the divergence angles of the second laser beam and the third laser beam.

[0036] In a third aspect, an embodiment of the present application provides a projection system, the projection system comprising a projection light core and a light source as described in any one of the first aspects above, the light source being used to emit a light beam; the projection light core being used to modulate the light beam according to an image source to obtain an imaging light beam. Optionally, the projection system may also include a lens, the lens being used to project the imaging light beam into an image. The lens can be used to form a virtual image or a real image. For a description of the beneficial effects of this aspect, please refer to the second aspect, and no further details will be given.

[0037] In a fourth aspect, an embodiment of the present application provides a head-up display system, comprising a light deflection module and a projection system as described in the third aspect; the projection system is used to transmit an imaging light beam to the light deflection module; the light deflection module is used to transmit the amplified imaging light beam to a windshield, and the amplified imaging light beam forms a virtual image through the windshield.

[0038] In a fifth aspect, an embodiment of the present application provides a lighting device, comprising a fixing base and the projection system as described in the third aspect, wherein the fixing base is used to fix the projection system. The lighting device may be a vehicle lamp.

[0039] In a sixth aspect, an embodiment of the present application provides a vehicle, comprising a vehicle body, a windshield, and a processor, wherein the vehicle body is used to fix the windshield and the processor, and the vehicle further comprises a head-up display system as shown in the fourth aspect and / or a lighting device as described in the fifth aspect. The processor is used to send an image source to the head-up display system and / or the lighting device. For example, the processor is used to transmit vehicle driving related information to the head-up display system and / or the lighting device; the head-up display system and / or the lighting device is used to modulate the vehicle driving related information on the projection light beam to obtain the imaging light beam.

[0040] In the seventh aspect, an embodiment of the present application provides a pair of smart glasses, comprising a frame, a lens, and a projection system as described in the third aspect, wherein the frame is used to fix the lens and the projection system, the projection system is used to emit an imaging light beam to the lens, and the lens is used to project the imaging light beam into an image.

[0041] In an eighth aspect, the present application provides a method. The method is applied to a light source, wherein the light source includes a first laser, a spectroscopic device, an optical device, and a first light combining device, wherein the optical device includes an optical mechanism and a driving mechanism, and the driving mechanism is used to drive the optical mechanism to move, and the method includes: the first laser emits laser light; then, the spectroscopic device separates the laser light into a first laser beam and a second laser beam; then, the first region of the optical mechanism receives the first laser beam and emits a fluorescent beam under the excitation of the first laser beam, and the second region of the optical mechanism receives the second laser beam and weakens the coherence of the second laser beam; then, the first light combining device receives the fluorescent beam and the second laser beam emitted through the second region, and combines the two for emission.

[0042] Optionally, the light source further includes a first beam shaping device, and the first beam shaping device is located in the optical path of the second laser beam before the second region. The method further includes: the first beam shaping device converges the second laser beam.

[0043] Optionally, the light source further includes a second beam shaping device, and the second beam shaping device is located in the optical path of the second laser beam after the second region. The method further includes: the second beam shaping device collimating the second laser beam.

[0044] Optionally, the light source further includes a second laser, and the method further includes: the second laser emits a third laser beam; then, the second region receives the third laser beam and weakens the coherence of the third laser beam; then, the first light combining device receives the third laser beam emitted from the second region, and combines the third laser beam with the fluorescent beam and the second laser beam. That is, the first light combining device is used to transmit the third laser beam, and the fluorescent beam, the second laser beam and the third laser beam are combined and emitted from the first light combining device.

[0045] The structure and function of the optical device can be understood by referring to the relevant contents in the first aspect or the second aspect, and will not be described in detail here.

[0046] For the description of the beneficial effects shown in the eighth aspect, please refer to the first aspect, and the details will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The projection system provided by the present application is schematically shown;

[0048] Figure 2-1 The HUD system provided by the present application is schematically shown;

[0049] Figure 2-2 The vehicle lamp provided by the present application is schematically shown;

[0050] Figure 3 A schematic top view of an optical mechanism in an optical device provided by the present application is shown;

[0051] Figure 4 and Figure 5 Schematically shown respectively Figure 3 A cross-sectional view of the optical mechanism shown;

[0052] Figure 6 to Figure 9 The optical path structures of the light sources provided in the present application are schematically shown respectively. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0054] The present application provides a light source. The light source can be applied to a projection system. The projection system is first introduced below.

[0055] Figure 1 A possible structure of the projection system is schematically shown. Figure 1 As shown, the projection system generally includes a light source, a projection light core and a lens. The light source is used to emit a light beam to the projection light core, the projection light core is used to modulate the light beam from the light source to obtain an imaging light beam, and the lens is used to project the imaging light beam into an image.

[0056] The present application does not limit the number of light valves in the projection light core. For example, the projection system may be a single-chip projection system, which realizes RGB three-color composite images by coordinating a light valve with the light source lighting sequence or the color wheel rotation sequence. For example, the projection system may be a three-chip projection system, which realizes composite images by using three light valves in the red, green and blue (RGB) three channels respectively.

[0057] The present application does not limit the type of light valve. For example, the projection system may use digital light processing (DLP) technology, with a DMD digital micro-reflector as a light valve. For example, the projection system may use liquid crystal display (LCD) technology, with LCD as a light valve. LCD is a transmissive device, and the projector uses the photoelectric effect of liquid crystal, that is, the arrangement of liquid crystal molecules changes under the action of an electric field, which affects the polarization state of the transmitted light of its LCD unit, thereby performing image signal modulation. For example, the projection system may use liquid crystal on silicon (LCOS) technology, with LCOS as a light valve, and also uses the photoelectric effect of liquid crystal to perform image modulation. However, unlike LCD, LCOS is a reflective device, and a drive panel is manufactured on a silicon wafer using semiconductor technology. Image signal modulation is achieved by changing the polarization state of the reflected light of the LCOS unit.

[0058] The lens may include one or more lenses. The lens may be a convex lens or a concave lens. Optionally, the projection system may also include a projection screen, so that the real image corresponding to the imaging light beam emitted by the lens can be displayed on the projection screen.

[0059] Optionally, the projection system may further include a controller connected to the projection light core, and configured to send a control signal to the projection light core according to the image source, wherein the control signal is configured to control the projection light core to modulate the light beam from the light source into an imaging light beam corresponding to the image source.

[0060] The controller may be one or more chips, or one or more integrated circuits. For example, the controller may be one or more optical digital signal processors (oDSP), field-programmable gate arrays (FPGA), application specific integrated circuits (ASIC), system on chip (SoC), central processor unit (CPU), network processor (NP), microcontroller unit (MCU), programmable logic device (PLD), network card chip, storage interface chip or other integrated chip, or any combination of the above chips or processors, etc., which will not be described in detail.

[0061] The projection system is also called a projector or a projection optical machine. This application does not limit the application scenarios of the projection system. For example, the projection system can be applied to portable display devices (such as projection mobile phones), home theaters, commercial projections (such as light shows, concerts), outdoor projections, conference presentations, classroom presentations, movie screenings, smart gesture interactive projections, smart home smart walls, head up display (HUD), augmented reality head up display system (AR-HUD), AR glasses and virtual reality technology (VR) glasses, etc.

[0062] Figure 2-1 This is a structural example diagram of the head-up display system provided by this application. Figure 2-1 As shown, the HUD system may include a projection system and a light deflection module. The projection system may be any of the projection systems described above. The projection system is used to transmit an imaging light beam to the light deflection module. The light deflection module is used to transmit an amplified imaging light beam to the windshield, and the imaging light beam forms a virtual image through the windshield. The HUD system projects vehicle-related information in front of the driver's field of vision. Vehicle-related information may be instrument information (such as vehicle speed) or navigation information, etc. Then, the driver sees vehicle-related information in front of the field of vision without having to look down at the instrument panel or central control display under the steering wheel, thereby improving the braking reaction time in an emergency and improving driving safety. This application takes the application of the HUD system to a vehicle as an example. In other examples, the HUD system may also be applied to ships, airplanes, helicopters and other vehicles that require a driver to drive.

[0063] The present application also provides a means of transport. The means of transport may be a vehicle, a ship, or an airplane, etc. The means of transport may include Figure 2-1 The HUD system and windshield shown. Of course, the vehicle may also include other components, such as a steering wheel, a processor, a memory, a wireless communication device, and a sensor, etc., which are not specifically limited in this application.

[0064] Figure 2-2 This is a structural example diagram of a projection lamp provided in this application. The projection lamp includes a fixing seat ( Figure 2-2 The fixing base can fix the projection system on the vehicle. Figure 2-2 A portion of a vehicle is schematically shown. The projection system may be any of the projection systems described above. The imaging light beam emitted from the projection system can form an image on the road surface on which the vehicle is traveling. Specifically, the imaging light beam displays a target light pattern in the road surface projection area of ​​the road surface to form an image. The target light pattern formed by the imaging light beam may be a light blanket displayed in the road surface projection area. The light blanket prompts the driver with the vehicle's advanced driving assistance system (ADAS) information, the main data on the vehicle dashboard (fuel consumption, engine speed, temperature, etc.), vehicle speed information, steering wheel angle information or vehicle body posture data, etc. through the modulated image, color, light pattern, etc., which is not specifically limited in this application. The imaging light beam emitted by the projection headlight shown in the present application and displayed in the target light pattern can also be used to illuminate the road surface around the vehicle, etc., to improve driving safety or navigation efficiency. The projection system can also be applied to other lighting equipment other than headlights.

[0065] The projection lamp shown in the present application is used for vehicle lighting and image projection, and can be a low beam lamp or an adaptive high beam lamp to realize vehicle assisted automatic driving. The vehicle can be an autonomous vehicle (autonomous vehicles; self-piloting automobile) also known as an unmanned vehicle, and the vehicle can also be a car, truck, motorcycle, bus, lawn mower, recreational vehicle, amusement park vehicle, tram, golf cart, train, or cart, etc.

[0066] The present application also provides a kind of smart glasses, and the smart glasses shown in the present application can be AR glasses or VR glasses. Smart glasses are a technology that cleverly integrates virtual information with the real world. It widely uses a variety of technical means such as multimedia, three-dimensional modeling, real-time tracking and registration, intelligent interaction, and sensing. After simulating computer-generated text, images, three-dimensional models, music, videos and other virtual information, they are applied to the real world. The two kinds of information complement each other, thereby achieving "enhancement" of the real world. With the enrichment of the variety of smart products, users are becoming more and more convenient to use. The smart glasses include a frame, a lens, a projection light core and a light source. For the description of the light source and the projection light core, please refer to the relevant content in the previous text. The lens, the projection light core and the light source are fixed on the frame, and the projection light core modulates the light beam from the light source to obtain an imaging light beam. The projection light core projects the imaging light beam onto the lens on the side facing the wearer's eye, so as to use the reflection function of the lens to reflect the imaging light beam into the wearer's eye.

[0067] The above examples introduce application scenarios to which the light source provided in the present application is applicable. The following describes the structure of the light source provided in the present application.

[0068] Laser projection display technology can reproduce the rich and gorgeous colors of the objective world in the most realistic way and provide stunning expressiveness. The light source provided in this application can be used to emit a laser-fluorescent mixed light beam. However, due to the high coherence of the laser beam, when the laser emitted by the light source is projected on the screen, the interference between the beams will cause a kind of irregularly distributed light and dark spots on the projected image, namely laser speckle. The presence of speckle seriously affects the imaging quality of the projected image, reduces the image resolution and contrast, and becomes an important obstacle to the development of laser projection display.

[0069] In order to reduce the influence of speckle noise, it is necessary to introduce a speckle elimination device into the light source, which will increase the number of devices in the light source and increase the volume of the light source, making it difficult to meet the market demand for miniaturization of projectors.

[0070] In order to reduce the number of components in a light source, the present application provides an optical device used in a light source, which can not only be used to emit fluorescence under the stimulation of an excitation laser in the light source, but also suppress the speckle effect of a non-excitation laser in the light source. In this way, it is not only beneficial for the light source to emit a speckle-suppressing fluorescent laser mixed beam, but also beneficial to reduce the number of components in the light source, reduce the volume of the projection light source, and meet the market demand for miniaturization of projectors.

[0071] The structure of the optical device is described below.

[0072] The optical device includes an optical mechanism and a driving mechanism, and the driving mechanism is used to drive the optical mechanism to move. The optical mechanism is used to be arranged in the optical path of the laser in the light source, and the optical mechanism includes a first area and a second area, wherein the first area is used to receive the first laser beam (i.e., the excitation laser) in the light source and emit a fluorescent beam under the excitation of the first laser beam, and the second area is used to receive the second laser beam (i.e., the non-excitation laser) in the light source and weaken the coherence of the second laser beam, thereby suppressing the speckle effect of the second laser beam. The fluorescent beam and the second laser beam can be used to be emitted from the light source after being combined, so that it is not only beneficial for the light source to emit a fluorescent laser mixed beam that suppresses speckle, but also beneficial to reduce the number of devices in the light source, reduce the volume of the projection light source, and meet the market demand for miniaturization of projectors.

[0073] During the movement of the optical mechanism, the first laser beam can be incident on different positions of the first area. Accordingly, multiple positions in the first area are used to receive the first laser beam in time-sharing and emit fluorescent beams under the stimulation of the first laser beam, which is conducive to avoiding excessive heat generation and low fluorescent emission efficiency due to continuous reception of the laser beam at a local position. In order to reduce the size of the first area, the first area can be the union of multiple incident positions of the first laser beam on the optical mechanism.

[0074] During the movement of the optical mechanism, the second laser beam can be incident on different positions of the second area. Accordingly, multiple positions in the second area are used to receive the second laser beam in time-sharing and weaken the coherence of the second laser beam. Since different positions have different effects on the phase of the laser beam, this is conducive to increasing the random phase of the second laser beam in space and enhancing the effect of weakening the coherence of the second laser beam. In order to reduce the size of the second area, the second area can be the union of multiple incident positions of the second laser beam on the optical mechanism.

[0075] The present application does not limit the trajectory of the driving mechanism driving the optical mechanism to move.

[0076] For example, the driving mechanism may drive the optical mechanism to vibrate, and the first area and the second area may be rectangular areas.

[0077] Alternatively, the driving mechanism is used to drive the optical mechanism to rotate around the axis, and the first area and the second area can be respectively a torus with the axis as the center axis. In this way, by adjusting the distance between the incident position of the laser beam on the optical mechanism and the axis, the laser beam can be incident on the specified area, which is convenient for designing the optical path. In this case, the optical mechanism can also be called a composite fluorescent wheel. Below, the possible structure of the optical mechanism is introduced in conjunction with the accompanying drawings.

[0078] Figure 3 A front view of the optical mechanism is schematically shown. Figure 3 Schematically shows three regions of the optical mechanism in the radial direction, namely, a circular region z1 with a radius r1, an annular region z2 with an inner diameter and an outer diameter of r1 and r2 respectively, and an annular region z3 with an inner diameter and an outer diameter of r2 and r3 respectively. The centers of the three regions are the same, which is Figure 3 the point c shown. As Figure 3 shown, r1 < r2 < r3. Among them, the circular region can be a substrate, which is used to set the first region and the second region, and is used to be installed together with the driving mechanism. The annular region z2 can be the first region introduced above, and the annular region z3 can be the second region introduced above. Or, the annular region z2 can be the second region introduced above, and the annular region z3 can be the first region introduced above.

[0079] Figure 3 Taking the annular region z2 and the annular region z3 being adjacent, that is, the inner diameter of the annular region z3 and the outer diameter of the annular region z2 are both r2 as an example, there can also be a gap between the two, that is, the inner diameter of the annular region z3 can be greater than the outer diameter of the annular region z2.

[0080] Taking the annular region z2 as the first region introduced above and the annular region z3 as the second region introduced above as an example, Figure 4 schematically shows Figure 3 the cross-section of the shown optical mechanism along the dotted line.

[0081] As Figure 4 shown, the region filled with black dots is the cross-section of the annular region z2. The annular region z2 sequentially includes a phosphor layer and a reflective layer along the thickness direction. The present application does not limit the structure or process of the phosphor layer. For example, the phosphor and an inorganic material can be mixed and cured to form the phosphor layer. The phosphor layer is used to emit fluorescence under the excitation of laser, and the reflective layer is used to reflect fluorescence. Figure 4 Also schematically shows the optical path after the excitation laser (represented by a solid black line with an arrow) is incident on the annular region z2. As Figure 4 shown, after the excitation laser is incident on the phosphor layer of the annular region z2, the phosphor layer emits fluorescence (represented by a dotted black line with an arrow), and the reflective layer reflects the fluorescence out.

[0082] The reflective layer can reflect the excitation laser. At this time, the incident direction of the excitation laser is opposite to the emission direction of the fluorescence, or rather, the surface where the excitation laser is incident is the same as the surface where the fluorescence is emitted, as Figure 4 shown. Or, the reflective layer can transmit the excitation laser. At this time, the incident direction of the excitation laser can be the same as the emission direction of the fluorescence, or rather, the surface where the excitation laser is incident is different from the surface where the fluorescence is emitted. The reflective layer is used to increase the light intensity of the fluorescence beam, and the annular region z2 may not include this reflective layer.

[0083] like Figure 4 As shown, the white filled area is the cross section of the annular area z3. The annular area z3 includes a diffusion layer, which is used to diffuse the laser beam to reduce or eliminate the speckle effect in the laser projection image. The diffusion layer can be made of a diffuser or a diffuser sheet, and its surface can also be coated with a diffuser or processed with a microstructure or sandblasted.

[0084] Figure 4 The optical path of the non-excitation laser (indicated by a black solid line with an arrow) after it enters the annular region z3 is also schematically shown. Figure 4 As shown, the non-excitation laser is incident on the annular area z3 and is transmitted from the annular area z3. Moreover, compared with the incident non-excitation laser, the emitted non-excitation laser has more random phases in space and worse coherence, which is conducive to reducing or even eliminating the speckle effect of the projected image.

[0085] like Figure 4 As shown, the black filled area is the cross section of the substrate. The substrate is used to be installed together with the driving mechanism to rotate around the axis ( Figure 4 The dotted line without an arrowhead) is shown rotating. Figure 4 Taking the cross section of the substrate as a T-shape as an example, the present application does not limit the specific shape of the cross section of the substrate. Optionally, the substrate may be a hollow structure, and the rotating shaft of the driving mechanism may be inserted into the hollow structure.

[0086] The present application does not limit the manner in which the structural part of the first region (eg, the phosphor layer) and the structural part of the second region (eg, the diffusion layer) are fixed together with the driving mechanism.

[0087] For example, the substrate may have an opening or a hollow portion corresponding to the structural portion so as to embed and set the corresponding structural portion, or the structural portion may be pasted on the substrate.

[0088] Alternatively, for example, the phosphor layer can be used as a substrate, a portion of the phosphor layer is used as the first region, a portion of the region (not mixed with phosphor) is used to set the second region, and a portion of the region is used to install the driving mechanism. Alternatively, the diffusion layer can be used as a substrate, a portion of the diffusion layer is used as the second region, a portion of the region is used to set the first region, and a portion of the region is used to install the driving mechanism. This is conducive to simplifying the structure of the optical device.

[0089] Take the annular area z2 as the second area introduced above, and the annular area z3 as the first area introduced above as an example. Figure 5 Schematically shown Figure 3 A cross section of the optical mechanism is shown along the dashed line.

[0090] Figure 5The area filled with black represents the substrate, the area filled with white represents the second area described above, and the area filled with black dots represents the first area described above. Figure 5 As shown, the circular area z1 is the substrate, the annular area z2 is the second area, and the annular area z3 is the first area. Figure 5 The structure of the circular area z1 can be referred to Figure 4 To understand the structure of the circular area z1, Figure 5 The structure of the middle annular region z2 can be referred to Figure 4 To understand the structure of the middle annular area z3, Figure 5 The structure of the middle annular region z3 can be referred to Figure 4 The structure of the middle annular area z2 can be understood by referring to the figure, which will not be described here.

[0091] The structure of the optical device provided by the present application is described above. The light source constructed using the optical device is described below.

[0092] The present application provides a light source, which includes a first laser, a spectrometer, an optical device and a first light combining device. The first laser is used to emit laser light. The spectrometer is arranged in the optical path of the laser, and is used to separate the laser light into a first laser beam and a second laser beam. The optical device includes an optical mechanism and a driving mechanism, the driving mechanism is used to drive the optical mechanism to move, the first area of ​​the optical mechanism is used to receive the first laser beam and emit a fluorescent beam under the excitation of the first laser beam, and the second area of ​​the optical mechanism is used to receive the second laser beam and weaken the coherence of the second laser beam. The first light combining device is used to receive the fluorescent beam and the second laser beam emitted through the second area, and can combine the fluorescent beam and the second laser beam emitted through the second area, so that the light source outputs a fluorescent laser mixed beam that suppresses speckle.

[0093] By arranging the above-mentioned optical device in the light source, not only can a fluorescent light beam be emitted to the first light combining device, but also a second laser light beam which is beneficial to suppressing speckle can be emitted to the first light combining device, thereby helping to reduce the number of devices in the light source, reduce the volume of the projection light source, and meet the market demand for miniaturization of projectors.

[0094] In addition, since the first area and the second area are used to receive different laser beams in the light source, the incident position of the first laser beam in the optical mechanism and the incident position of the second laser beam in the optical mechanism can be located at different positions in space, which is beneficial for the first area to receive the first laser beam while the second area receives the second laser beam, thereby facilitating the optical mechanism to simultaneously emit a fluorescent beam and a second laser beam that suppresses speckle, and further facilitating the light source to emit a laser-fluorescence mixed beam with a stable wavelength, thereby optimizing the display quality of the projected image.

[0095] The light source may include more devices. For example, in order to further improve the color gamut of the output light beam, optionally, the light source also includes a second laser, and the second laser is used to emit a third laser beam. The optical mechanism is also located in the optical path of the third laser beam. During the movement of the optical mechanism, the third laser beam can be incident on different positions of the optical mechanism, and the area in the optical mechanism for receiving the third laser beam is called the third area, and the third area is used to weaken the coherence of the third laser beam.

[0096] The first light combining device is used to combine the fluorescent light beam, the second laser light beam emitted through the second area and the third laser light beam emitted through the third area. Optionally, the second area and the third area are the same area on the optical mechanism, which is conducive to reducing the size of the optical mechanism.

[0097] For example, the light source may further include one or more deflection devices for changing the optical path of the light beam.

[0098] Figure 6 A possible structure of the light source is schematically shown. Figure 6 As shown, the light source includes a blue laser 1, a red laser 2, an optical structure 3, a beam splitter 4, a dichroic plate 5, a dichroic plate 6, a reflector 7, a reflector 8, a convex lens 9 and a convex lens 10.

[0099] The blue laser 1 is used to emit blue laser L0. The wavelength of the blue laser may be in the range of 440nm-470nm.

[0100] The beam splitter 4 is used to split the incident blue laser L0. After the blue laser L0 is incident on the beam splitter 4, the first blue laser beam L1 and the second blue laser beam L2 in the blue laser L0 are emitted in different directions. Figure 6 As shown, after the blue laser light L0 is incident on the beam splitter 4 , the beam splitter 4 transmits the first blue laser light beam L1 and reflects the second blue laser light beam L2 .

[0101] The optical mechanism 3 may be the optical mechanism in the optical device described above. The present application does not limit the shape and structure of the optical mechanism 3. For example, the optical mechanism 3 may be Figure 3 and Figure 4 To simplify the figure, Figure 6 The area filled with white represents the second area, and the area filled with black dots represents the first area.

[0102] The first blue laser beam L1 is incident on the dichroic plate 5, and the dichroic plate 5 reflects it to the first area of ​​the optical mechanism 3. The first area reflects the fluorescent beam F to the dichroic plate 5 under the excitation of the first blue laser beam L1. Afterwards, the dichroic plate 5 transmits the fluorescent beam F. The wavelength of fluorescence is generally a wide band of 490nm-700nm. For example, the fluorescent beam F can be a yellow fluorescent beam or a green fluorescent beam.

[0103] The second blue laser beam L2 is sequentially reflected by the dichroic plate 6, the reflector 7 and the reflector 8 to the dichroic plate 5. The dichroic plate 5 reflects the second blue laser beam L2 and emits it.

[0104] The red laser 2 is used to emit a red laser beam L3. The wavelength range of the red laser can be 630nm-660nm. The red laser beam L3 is incident on the dichroic plate 6, and the dichroic plate 6 transmits the red laser beam L3. The red laser beam L3 transmitted from the dichroic plate 6 is reflected by the reflector 7 and the reflector in turn and emitted to the dichroic plate 5. The dichroic plate 5 reflects the red laser beam L3 and emits it.

[0105] The fluorescent light beam F emitted from the dichroic plate 5, the second blue laser light beam L2 and the red laser light beam L3 are combined into an output light beam of the light source and emitted from the light source.

[0106] like Figure 6 As shown, the second area of ​​the optical structure 3 is located in the optical path of the second blue laser beam L2 and the red laser beam L3 between the reflector 7 and the reflector 8, which can weaken the coherence of the second blue laser beam L2 and the red laser beam L3, thereby facilitating the speckle effect of the output beam.

[0107] In order to ensure that the laser beam is incident on the second area, the surface area of ​​the second area is generally set to be much larger than the spot area of ​​the laser beam. Optionally, the light source further includes a first beam shaping device, which is located in the optical path of the laser beam before the diffusion component and is used to reduce the spot area of ​​the laser beam, thereby facilitating the reduction of the surface area of ​​the diffusion component and the volume of the light source.

[0108] The laser beam emitted from the first beam shaping device may be a collimated beam or a converging beam, and accordingly, the first beam shaping device may be a collimating lens or a converging lens. Taking the first beam shaping device as a converging lens as an example, the diffusion component may be located at the converging point of the converging lens. Figure 6 As shown, the first beam shaping device may be a convex lens 9. The convex lens 9 is disposed in the optical path of the second blue laser beam L2 and the red laser beam L3 before the second region, and can reduce the spot area of ​​the two incident on the second region.

[0109] The second region generally increases the divergence angle of the laser beam while weakening the coherence of the laser beam. Optionally, the light source further includes a second beam shaping device, which is located in the optical path of the laser beam after the second region. The second beam shaping device is used to reduce the divergence angle of the mixed laser beam, thereby facilitating the reduction of the size of the rear optical element. The second beam shaping device can be a collimating lens or a converging lens, such as Figure 6 The convex lens 10 is shown. The convex lens 10 is disposed in the optical path of the second blue laser beam L2 and the red laser beam L3 after the second area, and can reduce the divergence angles of the two.

[0110] This application does not limit the relative positions of the components in the light source. Figure 6 The light source shown schematically only shows the relative positions of the components. The light source provided in the present application may also include more components, such as a collimating component, a filter component, and more reflectors.

[0111] The second blue laser beam L2 and the red laser beam L3 emitted from the dichroic plate 6 can be combined into the same beam. In order to facilitate the observation of the optical paths of the beams, Figure 6 The optical paths of the two are drawn as different line segments with a certain distance. Similarly, the fluorescent light beam F reflected from the first area can propagate along the optical path of the first blue laser beam L1 to the dichroic film 5. In order to facilitate the observation of the optical paths of each light beam, Figure 6 The light paths of the two are drawn as different line segments with a certain distance.

[0112] Figure 6 Taking the blue laser 1 as an example of the first laser, the present application does not limit the wavelength of the laser emitted by the first laser. Figure 6 In the embodiment, the red laser 2 is used as an example of the second laser, and the present application does not limit the wavelength of the laser emitted by the second laser. Figure 6 In the figure, the blue laser L0, the first blue laser beam L1, the second blue laser beam L2, the red laser beam L3 and the fluorescent beam F are respectively used as examples of the laser emitted by the first laser, the first laser beam, the second laser beam, the third laser beam and the fluorescent beam introduced above, and the present application does not limit the specific optical path of each beam. Figure 6 Taking the beam splitter 4 as an example of a beam splitter, the present application does not limit the specific implementation of the beam splitter. Figure 6 Taking the dichroic plate 5 as an example of the first light combining device, the present application does not limit the specific implementation method of the first light combining device. For example, the first light combining device can be used to reflect the fluorescent light beam and transmit the second laser beam and the third laser beam. Figure 6Taking the dichroic plate 6 as an example of the second light combining device, the present application does not limit the specific implementation method of the second light combining device. For example, the second light combining device can be used to reflect the third laser beam and transmit the second laser beam. Figure 6 Taking the example of a deflection device (i.e., reflector 7 and reflector 8) being arranged in the optical path of the second laser beam, optionally, a deflection device may be arranged in the optical path of the first laser beam, or deflection devices may be arranged in the optical paths of the first laser beam and the second laser beam, respectively. Figure 6 Taking the deflection device as a reflector as an example, the present application does not limit the specific implementation method of the deflection device.

[0113] Figure 6 Taking the second light combining device and the light splitting device as different devices as an example, it is optional, such as Figure 7 As shown, the second light combining device can reuse the light splitting device, which is beneficial to reduce the number of devices in the light source, reduce the volume of the whole device, adapt to the development trend of miniaturization of equipment, and reduce costs.

[0114] Figure 7 Another possible structure of the light source is schematically shown. Figure 7 As shown, the light source includes a blue laser 1, a red laser 2, an optical structure 3, a beam splitter 11, a dichroic plate 12, a dichroic plate 13, a reflector 7, a reflector 8, a reflector 14, a convex lens 9 and a convex lens 10.

[0115] The blue laser 1 is used to emit blue laser light L0.

[0116] The beam splitter 11 is used to split the incident blue laser L0. After the blue laser L0 is incident on the beam splitter 11, the first blue laser beam L1 and the second blue laser beam L2 in the blue laser L0 are emitted in different directions. Figure 7 As shown, after the blue laser light L0 is incident on the beam splitter 11 , the beam splitter 11 transmits the first blue laser light beam L1 and reflects the second blue laser light beam L2 .

[0117] The optical mechanism 3 may be the optical mechanism in the optical device described above. The present application does not limit the shape and structure of the optical mechanism 3. For example, the optical mechanism 3 may be Figure 3 and Figure 4 To simplify the figure, Figure 7 The area filled with white represents the second area, and the area filled with black dots represents the first area.

[0118] The first blue laser beam L1 is sequentially reflected by the reflectors 7, 8 and 14 to the dichroic plate 13. The dichroic plate 13 transmits the first blue laser beam L1 to the first region of the optical mechanism 3. The first region reflects the fluorescent beam F to the dichroic plate 13 under the excitation of the first blue laser beam L1. Afterwards, the dichroic plate 13 reflects the fluorescent beam F to the dichroic plate 12, and the dichroic plate 12 transmits the fluorescent beam F out.

[0119] The second blue laser beam L2 is incident on the dichroic plate 12 via the convex lens 9, the second region, and the convex lens 10 in sequence, and the dichroic plate 12 reflects and emits the second blue laser beam L2.

[0120] The red laser 2 emits a red laser beam L3. The wavelength range of the red laser can be 630nm-660nm. The red laser beam L3 is incident on the dichroic plate 11, and the dichroic plate 11 transmits the red laser beam L3. The red laser beam L3 transmitted from the dichroic plate 11 is incident on the dichroic plate 12 through the convex lens 9, the second area and the convex lens 10 in sequence, and the dichroic plate 12 reflects the red laser beam L3. It can be seen that in Figure 7 In the light source shown, the beam splitter 11 is used not only as a beam splitter but also as a second beam combining device.

[0121] The roles of the convex lens 9, the second region and the convex lens 10 in the optical path can be referred to Figure 6 The relevant description in will not be repeated here.

[0122] The fluorescent light beam F emitted from the dichroic plate 12, the second blue laser light beam L2 and the red laser light beam L3 are combined into an output light beam of the light source and emitted from the light source.

[0123] This application does not limit the relative positions of the components in the light source. Figure 6 The light source shown schematically only shows the relative positions of the components. The light source provided in the present application may also include more components, such as a collimating component, a filter component, and more reflectors.

[0124] The second blue laser beam L2 and the red laser beam L3 emitted from the beam splitter 11 can be combined into the same beam. In order to facilitate the observation of the optical paths of the beams, Figure 7 The optical paths of the two are drawn as different line segments with a certain distance. Similarly, the fluorescent light beam F reflected from the first area can propagate along the optical path of the first blue laser beam L1 to the dichroic film 13. In order to facilitate the observation of the optical paths of each light beam, Figure 7 The light paths of the two are drawn as different line segments with a certain distance.

[0125] Figure 7Taking the blue laser 1 as an example of the first laser, the present application does not limit the wavelength of the laser emitted by the first laser. Figure 7 In the embodiment, the red laser 2 is used as an example of the second laser, and the present application does not limit the wavelength of the laser emitted by the second laser. Figure 7 In the figure, the blue laser L0, the first blue laser beam L1, the second blue laser beam L2, the red laser beam L3 and the fluorescent beam F are respectively used as examples of the laser emitted by the first laser, the first laser beam, the second laser beam, the third laser beam and the fluorescent beam introduced above, and the present application does not limit the specific optical path of each beam. Figure 7 Taking the beam splitter 4 as an example of a beam splitter, the present application does not limit the specific implementation of the beam splitter. Figure 7 Taking the dichroic plate 12 as an example of the first light combining device, the present application does not limit the specific implementation method of the first light combining device.

[0126] Figure 8 Another possible structure of the light source is schematically shown. Figure 8 The light source and Figure 6 The light sources shown differ only in that Figure 8 The relative position between the first area and the second area in the optical mechanism 3' is shown Figure 6 The relative positions of the two in the optical mechanism 3 shown are different, therefore, Figure 8 The light source shown can refer to Figure 6 The present application does not limit the shape and structure of the optical mechanism 3'. For example, the optical mechanism 3' can be as follows Figure 3 and Figure 5 To simplify the figure, Figure 8 The area filled with white represents the second area, and the area filled with black dots represents the first area.

[0127] Fig. 9 Another possible structure of the light source is schematically shown. Fig. 9 The light source and Figure 7 The light sources shown differ only in that Fig. 9 The relative position between the first area and the second area in the optical mechanism 3' is shown Figure 7 The relative positions of the two in the optical mechanism 3 shown are different, therefore, Fig. 9 The light source shown can refer to Figure 7 The present application does not limit the shape and structure of the optical mechanism 3'. For example, the optical mechanism 3' can be as follows Figure 3 and Figure 5 To simplify the figure, Fig. 9The area filled with white represents the second area, and the area filled with black dots represents the first area.

[0128] In the above, the example where both the second blue laser beam L2 and the red laser beam L3 pass through the second area is taken. Since the human eye is more sensitive to speckles formed by red laser, the optical path of the red laser beam L3 may be set to pass through the second area, while the optical path of the second blue laser beam L2 may not pass through the second area.

[0129] The present application does not limit the incident angle of the light beam in the light source on the surface of the optical device. The specific angle can be determined by the volume limitation of the light source or the projector.

[0130] Based on the structure and optical path of the light source of the present application described above, the method steps performed by each device in the light source during use can be determined, and the timing between different steps can be determined by the front and rear positions of different devices in the optical path. The specific implementation methods and effects of the method flow of each device performing the corresponding method steps can refer to the relevant introduction in the previous text, and will not be described in detail.

[0131] It should be noted that the terms "first", "second", "third", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, rather than to limit a specific order or precedence. It should be understood that the above terms can be interchanged where appropriate, so that the embodiments described in this application can be implemented in an order other than the content described in this application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0132] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A light source, characterized in that: The light source includes a first laser, a light splitting device, an optical device and a first light combining device; The first laser is used to emit laser light; The optical splitter is used to separate the laser into a first laser beam and a second laser beam; The optical device comprises an optical mechanism and a driving mechanism, wherein the driving mechanism is used to drive the optical mechanism to move, wherein a first region of the optical mechanism is used to receive the first laser beam and emit a fluorescent beam under the stimulation of the first laser beam, and a second region of the optical mechanism is used to receive the second laser beam and weaken the coherence of the second laser beam; The first light combining device is used to combine the fluorescent light beam and the second laser light beam emitted through the second area.

2. The light source according to claim 1, characterized in that The driving mechanism is used to drive the optical mechanism to rotate around an axis, and the first area and the second area are respectively annular bodies with the axis as the central axis.

3. The light source according to claim 2, characterized in that The first area surrounds the second area, or the second area surrounds the first area.

4. The light source according to any one of claims 1 to 3, characterized in that: The first region includes a phosphor layer, and the phosphor layer is used to generate the phosphor beam under the stimulation of the first laser beam.

5. The light source according to any one of claims 1 to 4, characterized in that: The second region includes a diffusion layer, and the diffusion layer is used to diffuse the second laser beam.

6. The light source according to any one of claims 1 to 5, characterized in that: The light source further comprises a first beam shaping device, the first beam shaping device being located in the optical path of the second laser beam before the second region; The first beam shaping device is used to converge the second laser beam.

7. The light source according to any one of claims 1 to 6, characterized in that: The light source further comprises a second beam shaping device, the second beam shaping device being located in the optical path of the second laser beam after the second region; The second beam shaping device is used to collimate the second laser beam.

8. The light source according to any one of claims 1 to 7, characterized in that: The light source also includes a second laser; The second laser is used to emit a third laser beam; The second region is also used to receive the third laser beam and weaken the coherence of the third laser beam; The first light combining device is further used for receiving the third laser beam emitted from the second area, and combining the third laser beam with the fluorescent beam and the second laser beam.

9. An optical device, characterized in that: The optical device is applied to a light source, and comprises an optical mechanism and a driving mechanism; The driving mechanism is used to drive the optical mechanism to move; The first area of ​​the optical mechanism is used to receive the first laser beam in the light source and emit a fluorescent beam under the stimulation of the first laser beam, and the second area of ​​the optical mechanism is used to receive the second laser beam in the light source and weaken the coherence of the second laser beam.

10. The optical device according to claim 9, characterized in that: The driving mechanism is used to drive the optical mechanism to rotate around an axis, and the first area and the second area are respectively annular bodies with the axis as the central axis.

11. The optical device according to claim 10, characterized in that: The first area surrounds the second area, or the second area surrounds the first area.

12. The optical device according to any one of claims 9 to 11, characterized in that: The first region includes a phosphor layer, and the phosphor layer is used to generate the phosphor beam under the stimulation of the first laser beam.

13. The optical device according to any one of claims 10 to 12, characterized in that: The second region includes a diffusion layer, and the diffusion layer is used to diffuse the second laser beam.

14. A method, characterized in that The method is applied to a light source, the light source includes a first laser, a light splitting device, an optical device and a first light combining device, wherein the optical device includes an optical mechanism and a driving mechanism, the driving mechanism is used to drive the optical mechanism to move, and the method includes: The first laser emits laser light; The optical splitter separates the laser into a first laser beam and a second laser beam; The first region of the optical mechanism receives the first laser beam and emits a fluorescent beam under the stimulation of the first laser beam; The second region of the optical mechanism receives the second laser beam and weakens the coherence of the second laser beam; The first light combining device combines the fluorescent light beam and the second laser light beam emitted through the second area.

15. The method according to claim 14, characterized in that The light source further includes a first beam shaping device, the first beam shaping device being located in an optical path of the second laser beam before the second region, and the method further includes: The first beam shaping device converges the second laser beam.

16. The method according to claim 14 or 15, characterized in that The light source further includes a second beam shaping device, and the second beam shaping device is located in the optical path of the second laser beam after the second region. The method further includes: The second beam shaping device collimates the second laser beam.

17. The method according to any one of claims 14 to 16, characterized in that: The light source further includes a second laser, and the method further includes: The second laser emits a third laser beam; The second region receives the third laser beam and weakens the coherence of the third laser beam; The first light combining device receives the third laser beam emitted from the second area, and combines the third laser beam with the fluorescent beam and the second laser beam.

18. A projection system, characterized in that: The projection system comprises a lens, a projection light core and a light source as claimed in any one of claims 1 to 8; The light source is used to emit a light beam; The projection light core is used to modulate the light beam according to the image source to obtain an imaging light beam; The lens is used for projecting the imaging light beam into an image.

19. A head-up display system, characterized in that: comprising a light deflection module and a projection system as claimed in claim 18; The projection system is used to transmit an imaging light beam to the light deflection module; The light deflection module is used to transmit the amplified imaging light beam to the windshield, and the amplified imaging light beam forms a virtual image through the windshield.

20. A lighting device, characterized in that: It comprises a fixing seat and the projection system as claimed in claim 18, wherein the fixing seat is used to fix the projection system.

21. A vehicle, characterized in that: A vehicle body, a windshield, a processor and an optical system, wherein the optical system includes the head-up display system according to claim 19 and / or includes the lighting device according to claim 20; The vehicle body is used to fix the windshield, the processor and the optical system; The processor is used to send an image source to the optical system.

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