Light source, related apparatus and method

Abstract

The invention discloses a light source, a related device and a method. By arranging the beam splitter in the light source, the laser emitted by the first laser is split into the first laser beam and the second laser beam which are respectively used for exciting the fluorescent light beam and combining to the output light beam, so that the light source can simultaneously output the fluorescent light beam and the second laser beam, and the laser and fluorescent mixed light beam with stable brightness is output. By arranging the first optical device in the light source, the first optical device is used for separating the transmission light paths of the fluorescent light beam and the first laser beam on one hand and combining the fluorescent light beam and the second laser beam on the other hand, the number of optical devices through which the fluorescent light beam passes is reduced, and therefore the efficiency loss of the fluorescent light beam is reduced; the transmission distance of the fluorescent light beam is shortened, the spot size of the output light beam is reduced, and the size of a next-stage optical system is reduced.

Description

Technical Field

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

[0002] The light source is the core component of the projector. The laser projection light source has the characteristics of high brightness, long life and wide color gamut, but it has the problems of high cost and severe speckle phenomenon. Using a laser-fluorescent hybrid light source as a projector light source can effectively reduce costs and reduce speckle phenomenon. Among this type of light source, most products use a segmented fluorescent wheel. The segmented fluorescent wheel has a laser transmission area and an excitation area coated with fluorescent powder. The laser beam emitted by the laser in the light source is used to be incident on the segmented fluorescent wheel. When the laser beam is irradiated to the laser transmission area on the segmented fluorescent wheel, the laser beam passes through the laser transmission area, and the light source emits a laser beam. When the laser beam is irradiated to the excitation area coated with fluorescent powder, the laser beam excites the fluorescent powder to emit a fluorescent beam, and the light source emits a fluorescent beam.

[0003] The light source using the segmented fluorescent wheel emits fluorescent beams and laser beams at different times, which makes it difficult to emit beams with stable wavelengths. It is easy to produce rainbow patterns in the projected image, which deteriorates the display quality of the projected image. Therefore, providing a laser-fluorescent hybrid light source with a stable wavelength is one of the important problems that scientific researchers in this field need to solve urgently. Summary of the invention

[0004] Embodiments of the present application provide a light source, related equipment, and method for emitting a laser-fluorescence mixed light beam with a stable wavelength.

[0005] In a first aspect, the present application provides a light source, which may include a first laser, a spectrometer, a first optical device and a fluorescent device. The first laser is used to emit a laser beam. The spectrometer is located in the transmission optical path of the laser beam of the first wavelength, and is used to split the incident laser beam to obtain a first laser beam and a second laser beam. The first optical device is located in the optical path of the first laser beam (referred to as the first optical path) and in the optical path of the second laser beam (referred to as the second optical path), and is used to transmit the first laser beam and the second laser beam respectively. The fluorescent device is used to receive the first laser beam from the first optical device, and emit a fluorescent beam to the first optical device along the optical path of the first laser beam under the excitation of the first laser beam. The first optical device is also used to transmit the fluorescent beam, so that the fluorescent beam and the second laser beam are combined.

[0006] By setting a beam splitter in the light source, the laser emitted by the first laser is separated into a first laser beam and a second laser beam, which are respectively used to excite the fluorescent beam and merged into the output beam. This is beneficial for the light source to simultaneously output (or emit) the fluorescent beam and the second laser beam, thereby outputting a laser-fluorescence mixed beam with a stable wavelength, thereby optimizing the display quality of the projected image.

[0007] The fluorescent light beam emitted from the fluorescent device can be incident on the first optical device against the first optical path, and then emitted from the first optical device along the second optical path. It can be seen that the first optical device can not only separate the optical paths of the fluorescent light beam and the first laser light beam to prevent the fluorescent light beam from being incident on the first laser against the first optical path, but also merge the fluorescent light beam and the second laser light beam to obtain a laser-fluorescence mixed light beam. Compared with using multiple optical devices to realize the functions of optical path separation and beam merging respectively, multiplexing the first optical device to realize these two functions is conducive to reducing the number of optical devices that the fluorescent light beam passes through, reducing the efficiency loss of fluorescence, and shortening the transmission distance of fluorescence. Since the divergence angle of the fluorescent light beam is generally greater than the divergence angle of the laser light beam, shortening the transmission distance of fluorescence is conducive to reducing the spot area of ​​the output light beam and reducing the volume of the next-level optical system, thereby helping to reduce the volume of the entire machine, adapting to the development trend of equipment miniaturization, and reducing costs.

[0008] Optionally, the first optical device transmits the first laser beam and the second laser beam in a first manner, and the first optical device transmits the fluorescent beam in a second manner, wherein the first manner and the second manner are a reflection manner and a transmission manner, respectively, or the first manner and the second manner are a transmission manner and a reflection manner, respectively.

[0009] The present application does not limit the principle that the first optical device simultaneously realizes the function of separating light paths and the function of merging light beams. For example, the first optical device can be used to transmit light beams incident from different surfaces in different ways, or the first optical device can be used to transmit light beams of different wavelengths in different ways. For example, the first optical device includes a dichroic plate.

[0010] The first optical device may have at least one high reflection band and at least one high transmission band, and may transmit a light beam in the high reflection band in a reflection manner, and transmit a light beam in the high transmission band in a transmission manner. Assume that the wavelength of the laser light beam is the first wavelength, and the wavelength of the fluorescent light beam is the second wavelength. The first optical device may be configured such that the first wavelength is located in the first band of the first optical device, and the second wavelength is located in the second band of the first optical device. The first band and the second band may be a high transmission band and a high reflection band, respectively, and accordingly, the first mode and the second mode are a reflection mode and a transmission mode, respectively. Alternatively, the first band and the second band may be a high reflection band and a high transmission band, respectively, and accordingly, the first mode and the second mode are a reflection mode and a transmission mode, respectively.

[0011] 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. It is advantageous to make the first laser beam and the second laser beam incident on the first optical device from different directions. For example, the first laser beam is incident on the first optical device from a first direction, and the second laser beam is incident on the first optical device from a second direction. The first optical device is used to guide the first laser beam to the fluorescent device.

[0012] For example, the first optical device may be located on the transmission optical path of the first laser beam, and the first laser beam is incident on the first optical device from a first direction. One or more deflection devices are located on the transmission optical path of the second laser beam, and the one or more deflection devices are 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 a second direction.

[0013] Alternatively, for example, one or more deflection devices are located on the transmission optical path of the first laser beam, and the one or more deflection devices are 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 a first direction. The first optical device can be located on the transmission optical path of the second laser beam, and the second laser beam is incident on the first optical device from a second direction.

[0014] 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.

[0015] The first wavelength may include a single wavelength or multiple wavelengths. For example, the first wavelength may include a wavelength range or peak wavelength corresponding to one or more peaks in the spectrum of the laser beam emitted by the first laser. Similarly, the second wavelength may include a single wavelength or multiple wavelengths. For example, the second wavelength may include a wavelength range or peak wavelength corresponding to one or more peaks in the spectrum of the fluorescent beam emitted by the fluorescent device. The present application does not limit the method of determining the wavelength range corresponding to the peak, for example, the wavelength range corresponding to the peak may be the wavelength range corresponding to the half-width of the peak.

[0016] The first wavelength and the second wavelength are different, which is beneficial to improving the color gamut of the output light beam. Optionally, the output light beam is used to achieve full-color display.

[0017] Optionally, the first wavelength is lower than the second wavelength, which is beneficial to increase the photon energy of the first laser beam, thereby facilitating improving the efficiency of the first laser beam in stimulating a fluorescent beam from the fluorescent device. For example, the first wavelength is a blue wavelength, and the second wavelength includes at least one of a yellow wavelength, a red wavelength, and a green wavelength.

[0018] In order to further improve the color gamut of the output light beam, the light source may further include a second laser, and the second laser is used to emit a third laser beam. The first optical device is also used to transmit and receive the third laser beam, so that the third laser beam, the fluorescent beam and the second laser beam are combined. Assuming that the wavelength of the third laser beam is a third wavelength, the third wavelength is different from the first wavelength and the second wavelength, this is conducive to further improving the color gamut of the output light beam and optimizing the viewing effect of the full-color display. Optionally, the third wavelength is greater than the first wavelength and less than or greater than the second wavelength. For example, the first wavelength is a blue light wavelength, the second wavelength is a red light wavelength, and the third wavelength is a green light wavelength. Or, for example, the first wavelength is a blue light wavelength, the second wavelength is a green light wavelength, and the third wavelength is a red light wavelength.

[0019] Moreover, compared with arranging other optical devices in the optical path after the first optical device to merge the third laser beam into the mixed beam of the second laser beam and the fluorescent beam, the third laser beam is transmitted by multiplexing the first optical device, and the second laser beam, the fluorescent beam and the third laser beam emitted from the first optical device are merged into the same beam, which is conducive to reducing the number of optical devices passed by the fluorescent beam, reducing the efficiency loss of the fluorescent beam, and shortening the transmission distance of the fluorescent beam. Since the divergence angle of the fluorescent beam is generally greater than the divergence angle of the laser beam, shortening the transmission distance of the fluorescent beam is conducive to reducing the spot area of ​​the output beam and reducing the volume of the next-level optical system, thereby helping to reduce the volume of the entire machine, adapting to the development trend of miniaturization of equipment, and reducing costs.

[0020] Optionally, the first optical device is used to transmit the third laser beam in a first manner.

[0021] Optionally, the second laser beam and the third laser beam are combined by a second optical device and then incident on the first optical device. For example, the light source further includes a second optical device, which is located in the optical path of the second laser beam and the third laser beam before the first optical device, and is used to combine the second laser beam and the third laser beam.

[0022] The second laser beam and the third laser beam can be incident on the second optical device from different directions, and the second optical device is used to combine the second laser beam and the third laser beam incident from different directions and then guide them to the first optical device, which is conducive to simplifying the light source design. Optionally, the second optical device is used to transmit the second laser beam and reflect the third laser beam.

[0023] Optionally, the second optical device is the beam splitter, and the beam splitter is multiplexed 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 whole device, adapting to the development trend of miniaturization of equipment, and reducing costs.

[0024] 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.

[0025] Since the optical efficiency of the reflector is higher than that of the dichroic film, optionally, the one or more deflection devices may include at least one reflector, which is beneficial to reducing the optical efficiency loss of the second laser beam and improving the light intensity of the output beam.

[0026] Due to the high coherence of the laser, when the laser is projected on the screen, the interference between the light beams will cause speckle phenomenon in the projected image. Speckle is manifested as irregular intensity distribution when the laser is reflected, scattered, or transmitted from a rough surface, and spots with random granular distribution appear, which causes a poor experience for the subjective perception of the human eye. Optionally, the light source also includes a third optical device, which is located in the optical path of the second laser beam and / or the third laser beam, and is used to weaken the coherence of the second laser beam and / or the third laser beam, so as to suppress or eliminate the speckle in the projected image of the laser and improve the imaging quality of the display image. The following text takes the example of the third optical device being located between the second optical device and the first optical device, that is, the third optical device is used to weaken the coherence of the second laser beam and the third laser beam. For the convenience of description, the merged second laser beam and the third laser beam emitted from the second optical device are referred to as a mixed laser beam.

[0027] The present application does not limit the principle of the third optical device to reduce the coherence of the laser beam. The third optical device includes a diffusion component, which is used to diffuse the mixed laser beam. The diffusion component 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. Optionally, the third optical device also includes a driving mechanism, which is used to drive the diffusion component to move, thereby facilitating further reducing the coherence of the light field, thereby reducing the speckle effect of the laser.

[0028] At the same time, the diffusion component can also homogenize the spot energy of the mixed laser beam, thereby reducing the situation where the energy is too concentrated when the mixed laser beam passes through the optical device (such as the first optical device) and causes the optical component to heat up too quickly or dust to accumulate.

[0029] The following text takes the third optical device including the diffusion component as an example for introduction.

[0030] Optionally, the diffusion component is located in the optical path of the mixed laser beam before the first optical device, which is beneficial to reduce the number of optical devices passed by the fluorescent beam, reduce the efficiency loss of fluorescence, and shorten the transmission distance of fluorescence.

[0031] In order to ensure that the mixed laser beam is incident on the surface of the moving diffusion component, it is generally necessary to set the surface area of ​​the diffusion component to be much larger than the spot area of ​​the mixed laser beam.

[0032] Optionally, the light source further includes a first beam shaping device, which is located in the optical path of the mixed laser beam before the diffusion component and is used to reduce the spot area of ​​the mixed laser beam, thereby facilitating reducing the surface area of ​​the diffusion component and reducing the volume of the light source.

[0033] The mixed laser beam emitted from the first beam shaping device can be a collimated beam or a convergent beam, and accordingly, the first beam shaping device can be a collimated lens or a convergent lens. Taking the first beam shaping device as a convergent lens as an example, the diffusion component can be located at the convergent focus of the convergent lens.

[0034] The third optical device generally increases the divergence angle of the mixed laser beam while weakening the coherence of the mixed laser beam. Optionally, the light source further includes a second beam shaping device, which is located in the optical path of the mixed laser beam between the diffusion component and the first optical device, and is used to reduce the divergence angle of the mixed laser beam, thereby facilitating the reduction of the size of the rear optical element (such as the first optical device). The second beam shaping device can be a collimating lens or a converging lens.

[0035] In a second 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 may 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 first aspect, and no further details will be given.

[0036] In a third 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 second 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.

[0037] In a fourth aspect, an embodiment of the present application provides a lighting device, comprising a fixing base and the projection system as described in the second aspect, wherein the fixing base is used to fix the projection system. The lighting device may be a vehicle lamp.

[0038] In a fifth 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 third aspect and / or a lighting device as described in the fourth 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.

[0039] In a sixth 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 second 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.

[0040] In a seventh aspect, the present application provides a method. The method is applied to a light source, the light source includes a first laser, a spectroscopic device, a first optical device and a fluorescent device, and the method includes: the first laser emits a laser beam, then the spectroscopic device separates the laser beam into a first laser beam and a second laser beam, then the first optical device transmits the first laser beam and the second laser beam respectively, then the fluorescent device receives the first laser beam from the first optical device, and emits a fluorescent beam to the first optical device under the stimulation of the first laser beam, and then the first optical device also transmits the fluorescent beam, so that the fluorescent beam and the second laser beam are combined.

[0041] Optionally, the first optical device transmits the first laser beam and the second laser beam in a first manner, and the first optical device transmits the fluorescent beam in a second manner, wherein the first manner and the second manner are a reflection manner and a transmission manner, respectively, or the first manner and the second manner are a transmission manner and a reflection manner, respectively.

[0042] Optionally, the light source further includes a second laser, and the method further includes: the second laser emits a third laser beam, and then the first optical device also transmits the third laser beam, so that the third laser beam, the fluorescent beam and the second laser beam are combined.

[0043] Optionally, the light source further includes a second optical device, which is located in an optical path of the second laser beam and the third laser beam before the first optical device, and the method further includes: the second optical device merging the second laser beam and the third laser beam.

[0044] Optionally, the light source further includes a third optical device, and the third optical device is located in the light path between the first optical device and the second optical device. The method further includes: the third optical device weakens the coherence of the second laser beam and the third laser beam.

[0045] Optionally, the light source further includes one or more deflection devices, and the one or more deflection devices are located in the optical path of a target laser beam, and the target laser beam is the first laser beam or the second laser beam. The method further includes: the one or more deflection devices change the propagation direction of the target laser beam.

[0046] For the description of the beneficial effects shown in the seventh 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-Figure 5 The light sources provided in the present application are schematically illustrated respectively. DETAILED DESCRIPTION

[0051] 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.

[0052] The present application provides a light source. The light source can be applied to a projection system. The projection system is first introduced below.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 2-2A 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] The present application provides a light source, which may include a first laser, a spectrometer, a first optical device and a fluorescent device. The first laser is used to emit a laser beam. The spectrometer is located in the transmission optical path of the laser beam of the first wavelength, and is used to split the incident laser beam to obtain a first laser beam and a second laser beam. The first optical device is located in the optical path of the first laser beam (referred to as the first optical path) and in the optical path of the second laser beam (referred to as the second optical path), and is used to transmit the first laser beam and the second laser beam respectively. The fluorescent device is used to receive the first laser beam from the first optical device, and emit a fluorescent beam to the first optical device along the optical path of the first laser beam under the excitation of the first laser beam. The first optical device is also used to transmit the fluorescent beam, so that the fluorescent beam and the second laser beam are combined.

[0067] By setting a beam splitter in the light source, the laser emitted by the first laser is separated into a first laser beam and a second laser beam, which are respectively used to excite the fluorescent beam and merged into the output beam. This is beneficial for the light source to output the fluorescent beam and the second laser beam at the same time, thereby outputting a laser-fluorescent mixed beam with stable brightness and wavelength, thereby optimizing the display quality of the projected image.

[0068] Figure 3 A possible structure of a light source is schematically shown.

[0069] like Figure 3 As shown, the light source includes a blue laser 1. The blue laser 1 is used to emit a blue laser beam L0.

[0070] The light source further includes a beam splitter 2, which is used to reflect and transmit the incident light in a specific ratio. The beam splitter 2 is located on the transmission optical path of the blue laser beam L0 emitted by the blue laser 1. The blue laser beam L0 is incident on the beam splitter 2 at an incident angle of 45°. The blue laser beam L1 in the blue laser beam L0 is transmitted through the beam splitter 2, and the blue laser beam L2 in the blue laser beam L0 is reflected from the beam splitter 2.

[0071] The light source further includes a dichroic plate 3, which is used to transmit the blue laser light L1. The dichroic plate 3 is located on the transmission optical path of the blue laser light beam L1, and the blue laser light beam L1 is incident on the dichroic plate 3 at an incident angle of 45°, and then is transmitted from the dichroic plate 3.

[0072] The light source further includes a fluorescent device 4, which is used to reflect fluorescence under the irradiation and excitation of the blue laser. The fluorescent device 4 is located on the transmission optical path of the blue laser beam L1 transmitted from the dichroic plate 3. After the blue laser beam L1 is incident on the fluorescent device 4 at an incident angle of 0°, the fluorescent device 4 reflects the fluorescence beam F1 under the irradiation and excitation of the blue laser beam L1. The reflected fluorescence beam F1 is incident on the dichroic plate 3.

[0073] The dichroic plate 3 is also used to reflect fluorescence. After the fluorescence light beam F1 enters the dichroic plate 3, it is reflected by the dichroic plate 3 and then emitted.

[0074] The light source further includes a reflector 5 and a reflector 6, which are used to reflect the incident light respectively. The reflector 5 and the reflector 6 are sequentially located on the transmission optical path of the blue laser beam L2 emitted from the beam splitter 2, and the blue laser beam L2 is sequentially reflected and emitted from the reflector 5 and the reflector 6. The blue laser beam L2 reflected and emitted from the reflector 6 is incident on the dichroic plate 3.

[0075] After the blue laser beam L2 enters the dichroic plate 3, it is transmitted through the dichroic plate 3 and then emitted. Furthermore, the blue laser beam L2 transmitted through the dichroic plate 3 and the fluorescent beam F1 reflected from the dichroic plate 3 are combined into an output beam.

[0076] The output beam can be used as the output beam of the light source and can be used to transmit to the next optical system, such as a projection light core.

[0077] The wavelength range of the blue laser may be 440nm-470nm, and the wavelength of the fluorescence is generally a wide band of 490nm-700nm. For example, the fluorescent light beam F1 may be a yellow fluorescent light beam, and the output light beam may be white light data for achieving full-color display.

[0078] It can be seen that the first laser introduced above can be referred to Figure 3 The blue laser 1 shown, the beam splitter can refer to the beam splitter 2, and the first optical device can refer to Figure 3 The dichroic plate 3 shown, the fluorescent device can refer to the fluorescent device 4, the first laser beam can refer to the blue laser beam L1, the second laser beam can refer to the blue laser beam L2, and the fluorescent beam can refer to the fluorescent beam F1. The first direction, the second direction and the third direction described above are different directions relative to the first optical device. Figure 3 As shown, the blue laser beam L1 (i.e. the first laser beam) is incident from the top of the dichroic plate 3, the blue laser beam L2 (i.e. the second laser beam) is incident from the right of the dichroic plate 3, and the fluorescent beam F1 (i.e. the fluorescent beam) is incident from the bottom of the dichroic plate 3.

[0079] The dichroic plate 3 is not only used to separate the transmission optical paths of the fluorescent light beam F1 and the blue laser light beam L1, but also used to merge the fluorescent light beam F1 and the blue laser light beam L2, which is beneficial to reduce the number of optical devices passed by the fluorescent light beam F1, thereby helping to reduce the efficiency loss of the fluorescent light beam F1, shorten the transmission distance of the fluorescent light beam F1, and further reduce the spot size of the light beam 4, thereby helping to reduce the volume of the next-level optical system.

[0080] In order to observe the optical path of each light beam, Figure 3 The incident positions of the blue laser beam L1 and the blue laser beam L2 on the dichroic plate 3 are plotted at different positions on the surface of the dichroic plate 3. In practical applications, the incident positions of the blue laser beam L1 and the blue laser beam L2 on the dichroic plate 3 may be the same.

[0081] Similarly, in order to observe the optical path of each light beam, Figure 3 The optical path of the fluorescent light beam F and the optical path of the blue laser light beam L1 are drawn at different positions between the dichroic plate 3 and the fluorescent device 4. In practical applications, the optical paths of the fluorescent light beam F and the blue laser light beam L1 between the dichroic plate 3 and the fluorescent device 4 may overlap.

[0082] like Figure 3 As shown, the light source may further include one or more deflection devices (such as reflectors 5 and 6). Reflectors 5 and 6 are used to change the propagation direction of the blue laser beam L2, which is beneficial for the blue laser beam L1 and the blue laser beam L2 to be incident on the beam splitter 3 from different directions.

[0083] Alternatively, one or more deflection devices may be located on the transmission optical path of the blue laser beam L1, and the one or more deflection devices are used to change the propagation direction of the blue laser beam L1, so that the blue laser beam L1 is incident on the beam splitter 3 from a first direction. The beam splitter 3 may be located on the transmission optical path of the blue laser beam L2, and the blue laser beam L2 is incident on the beam splitter 3 from a second direction.

[0084] Alternatively, one or more deflection devices (referred to as first deflection devices) may be provided in the optical path of the blue laser beam L1, and one or more deflection devices (referred to as second deflection devices) may also be provided in the optical path of the blue laser beam L2. The first deflection device is used to change the propagation direction of the blue laser beam L1 so that the blue laser beam L1 is incident on the first optical device from a first direction. The second deflection device is used to change the propagation direction of the blue laser beam L2 so that the blue laser beam L2 is incident on the first optical device from a second direction.

[0085] The present application does not limit the number of the one or more deflection devices. The light source may include Figure 3 or Figure 4 Greater or lesser numbers of deflection devices are shown.

[0086] Figure 3 Taking the first wavelength of the laser beam emitted by the first laser as a blue wavelength as an example, the present application does not limit the specific value range of the first wavelength. The present application also does not limit the second wavelength of the fluorescent beam emitted by the fluorescent device, for example, the second wavelength may include at least one of the yellow light wavelength, the red light wavelength and the green light wavelength.

[0087] In order to further improve the color gamut of the output light beam, the light source may also include a second laser, which is used to emit a third laser beam with a third wavelength. The first optical device is also used to transmit and receive the third laser beam, so that the third laser beam, the fluorescent beam and the second laser beam are combined.

[0088] Figure 4 Another possible structure of the light source is schematically shown.

[0089] and Figure 3 Different light sources are shown. Figure 4 The light source shown also includes a red laser 7. Figure 3 The reflector 5 shown is replaced by a dichroic plate 8. The red laser 7 is used to emit red laser light. The wavelength of the red laser light may be in the range of 630nm-660nm. The dichroic plate 8 is used to transmit the red laser light and reflect the blue laser light. Figure 4 The functions of other optical devices shown can be referred to Figure 3 The functions of the optical devices with the same positions or the same numbers as shown can be understood, for example, the dichroic plate 3 is used to transmit blue laser and reflect fluorescence. Figure 4 Light path in the light source shown.

[0090] The blue laser beam L0 emitted by the blue laser 1 is incident on the beam splitter 2 at an incident angle of 45°. The blue laser beam L1 of the blue laser beam L0 is transmitted through the beam splitter 2 and the blue laser beam L2 of the blue laser beam L0 is reflected from the beam splitter 2.

[0091] The blue laser beam L1 is incident on the dichroic plate 3 at an incident angle of 45°, then transmits through the dichroic plate 3 and is incident on the fluorescent device 4 at an incident angle of 0°. The fluorescent device 4 is excited by the irradiation of the blue laser beam L1 and reflects the fluorescent beam F2. The reflected fluorescent beam F2 is incident on the dichroic plate 3 and then reflects on the dichroic plate 3 and is emitted.

[0092] After being reflected by the beam splitter 8 , the blue laser beam L2 is reflected by the dichroic plate 8 and the reflector 6 in sequence, and then enters the dichroic plate 3 , and is transmitted through the dichroic plate 3 .

[0093] The red laser beam L3 emitted by the red laser 7 is incident on the dichroic plate 8, and then is transmitted from the dichroic plate 8 to the reflector 6, and is reflected from the reflector 6 to the dichroic plate 3. The dichroic plate 3 is also used to transmit the red laser. After the red laser beam L3 is incident on the dichroic plate 3, it is transmitted from the dichroic plate 3.

[0094] The fluorescent light beam F2, the blue laser light beam L2 and the red laser light beam L3 emitted from the dichroic film 3 are combined into an output light beam. The output light beam can be used as the output light beam of the light source and can be used to transmit to the next optical system, such as a projection light core. The fluorescent light beam F2 can be a green fluorescent light beam, and the output light beam can be used to achieve full-color display.

[0095] The second laser introduced above can be referred to Figure 4 The red laser 7 shown, the third laser beam can refer to the red laser beam L3. The dichroic plate 3 is not only used to separate the fluorescent beam F2 and the blue laser beam L1, but also used to merge the fluorescent beam F2, the blue laser beam L2 and the red laser beam L3. Compared with using other optical devices to merge the red laser beam L3 into the output beam, merging the red laser beam L3 into the output beam by multiplexing the dichroic plate 3 is beneficial to reducing the number of optical devices that the fluorescent beam F2 passes through, thereby helping to reduce the efficiency loss of the fluorescent beam F2, shorten the transmission distance of the fluorescent beam F2, and further reduce the spot size of the output beam, which is beneficial to reducing the volume of the next-level optical system. In addition, and Figure 3 The output beam shown is compared to Figure 4 The output light beam shown includes a two-color laser light beam, which is beneficial to improving the color gamut of the output light beam and enhancing the user's viewing experience.

[0096] In order to observe the optical path of each light beam, Figure 4 The incident positions of the blue laser beam L1 and the blue laser beam L2 on the dichroic plate 3 are plotted at different positions on the surface of the dichroic plate 3. In practical applications, the incident positions of the blue laser beam L1 and the blue laser beam L2 on the dichroic plate 3 may be the same.

[0097] Similarly, in order to observe the optical path of each light beam, Figure 4 The optical path of the fluorescent light beam F and the optical path of the blue laser light beam L1 are drawn at different positions between the dichroic plate 3 and the fluorescent device 4. In practical applications, the optical paths of the fluorescent light beam F and the blue laser light beam L1 between the dichroic plate 3 and the fluorescent device 4 may overlap.

[0098] Similarly, in order to observe the optical path of each light beam, Figure 4The incident positions of the red laser beam L3 and the blue laser beam L2 on the dichroic plate 8 are plotted at different positions on the surface of the dichroic plate 8. In practical applications, the incident positions of the red laser beam L3 and the blue laser beam L2 on the dichroic plate 8 may be the same. Accordingly, the optical paths of the red laser beam L3 and the blue laser beam L2 after the dichroic plate 8 may overlap.

[0099] Assuming that the wavelength of the third laser beam is the third wavelength, the third wavelength is different from the first wavelength and the second wavelength, which is conducive to further improving the color gamut of the output beam and optimizing the viewing effect of the full-color display. Optionally, the third wavelength is greater than the first wavelength and less than or greater than the second wavelength. For example, the first wavelength is a blue wavelength, the second wavelength is a red wavelength, and the third wavelength is a green wavelength. Or, for example Figure 4 As shown, the first wavelength is a blue light wavelength, the third wavelength is a red light wavelength, and the second wavelength may be a green light wavelength.

[0100] like Figure 4 As shown, the light source may also include a second optical device (eg Figure 4 The second optical device is located in the optical path of the second laser beam and the third laser beam before the first optical device, and is used to merge the second laser beam and the third laser beam. The merged second laser beam and the third laser beam (called a mixed laser beam) are used to be incident on the first optical device, which is conducive to simplifying the light source design. Optionally, the dichroic plate 8 is used to reflect the red laser beam L3 and to transmit the blue laser beam L2. Or, for example Figure 4 As shown, the dichroic plate 8 is used to transmit the red laser beam L3 and to reflect the blue laser beam L2. By combining the second laser beam and the third laser beam through multiplexing deflection devices, the number of optical devices in the light source is reduced, thereby reducing the volume of the whole device, adapting to the development trend of equipment miniaturization, and reducing costs. The present application does not limit the position of the second optical device. For example, it can be replaced. Figure 4 The positions of the dichroic plate 8 and the reflecting mirror 6 are adjusted, and the red laser is set to the right of the dichroic plate 8.

[0101] refer to Figure 4 The dichroic plate 8 is not only used as a deflection device for the blue laser beam L2, but also as a light combining device for the blue laser beam L2 and the red laser beam L3, which is beneficial to reduce the number of devices in the light source, reduce the volume of the whole machine, adapt to the development trend of miniaturization of equipment, and reduce costs. Optionally, the deflection device can include a dichroic plate.

[0102] Optional, Figure 4The beam splitter 2 shown can also be used as a second optical device to multiplex the beam splitter to combine the blue laser beam L2 and the red laser beam L3. This is beneficial to reducing the number of devices in the light source, reducing the size of the entire device, adapting to the development trend of miniaturization of equipment, and reducing costs.

[0103] Due to the high coherence of the laser, when the laser is projected onto the screen, the interference between the light beams will cause speckle to appear on the projected image. Speckle is manifested as an irregular intensity distribution when the laser is reflected, scattered, or transmitted from a rough surface, resulting in the appearance of spots with random granular distribution, which causes a poor subjective experience for the human eye. Optionally, the light source also includes a third optical device, which is located in the optical path of the second laser beam and / or the third laser beam, and is used to weaken the coherence of the second laser beam and / or the third laser beam, thereby facilitating the suppression or elimination of speckle in the projected image of the laser and improving the imaging quality of the displayed image. The following text takes the example of the third optical device being located between the second optical device and the first optical device, that is, the third optical device is used to weaken the coherence of the second laser beam and the third laser beam. For ease of description, the merged second laser beam and the third laser beam emitted from the second optical device are referred to as a mixed laser beam.

[0104] The present application does not limit the principle of the third optical device to reduce the coherence of the laser beam. The third optical device includes a diffusion component, which is used to diffuse the mixed laser beam. The diffusion component 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. Optionally, the third optical device also includes a driving mechanism, which is used to drive the diffusion component to move, thereby facilitating further reducing the coherence of the light field, thereby reducing the speckle effect of the laser.

[0105] At the same time, the diffusion component can also homogenize the spot energy of the mixed laser beam, thereby reducing the situation where the energy is too concentrated when the mixed laser beam passes through the optical device (such as the first optical device) and causes the optical component to heat up too quickly or dust to accumulate.

[0106] The following text takes the third optical device including the diffusion component as an example for introduction.

[0107] Figure 5 Another possible structure of the light source is schematically shown.

[0108] and Figure 4 Different light sources are shown. Figure 5 The light source shown is further provided with a convex lens 9, a diffusion component 10 and a convex lens 11.

[0109] The diffusion component 10 is used to diffuse the incident light before emitting it. The diffusion component 10 can perform irregular diffuse scattering on the laser beam, increase the random phase of the laser beam in space, reduce the coherence of the laser beam, and weaken the speckle phenomenon on the light source projection image. The present application does not limit the implementation method of the diffusion component 10. For example, the diffusion component 10 may include but is not limited to a diffuser and / or a microlens. The surface of the diffusion component 10 may be coated with a diffuser, or a microstructure may be processed on the surface of the diffusion component 10, which may also have a diffuse reflection effect. The diffusion component 10 may be stationary or moving. Including but not limited to a diffuser, a microlens, etc. The convex lens 9 is used to converge the incident light, and the convex lens 11 is used to diverge the incident light. The diffusion component 10 may be located at the convergence focus of the convex lens 9.

[0110] Figure 5 The functions of other optical devices shown can be referred to Figure 4 The functions of the optical devices with the same positions or the same numbers as shown in the figure can be understood, for example, the dichroic plate 3 is used to transmit blue laser and red laser and reflect fluorescence. Figure 5 Light path in the light source shown.

[0111] The blue laser beam L0 emitted by the blue laser 1 is incident on the beam splitter 2 at an incident angle of 45°. The blue laser beam L1 of the blue laser beam L0 is transmitted through the beam splitter 2 and the blue laser beam L2 of the blue laser beam L0 is reflected from the beam splitter 2.

[0112] The blue laser beam L1 is incident on the dichroic plate 3 at an incident angle of 45°, then transmits through the dichroic plate 3 and is incident on the fluorescent device 4 at an incident angle of 0°. The fluorescent device 4 is excited by the irradiation of the blue laser beam L1 and reflects the fluorescent beam F2. The reflected fluorescent beam F2 is incident on the dichroic plate 3 and then reflects on the dichroic plate 3 and is emitted.

[0113] After being reflected on the beam splitter 2, the blue laser beam L2 is reflected from the dichroic plate 8 and emitted to the convex lens 9, and then is converged by the convex lens 9 and incident on the reflector 6. The converged blue laser beam L2 is reflected by the reflector 6 to the diffusion component 10, and then is diffused by the diffusion component 10 and incident on the convex lens 11, and then is diverged by the convex lens 11 and incident on the dichroic plate 3, and then is transmitted and emitted from the dichroic plate 3.

[0114] The red laser beam L3 emitted by the red laser 7 is incident on the dichroic plate 8, and then is transmitted from the dichroic plate 8 to the convex lens 9, and is incident on the reflector 6 after being converged by the convex lens 9. The converged blue laser beam L2 is reflected by the reflector 6 to the diffusion component 10, and is diffused by the diffusion component 10 and is incident on the convex lens 11, and is diverged by the convex lens 11 and is incident on the dichroic plate 3, and is transmitted from the dichroic plate 3.

[0115] The fluorescent light beam F2, the blue laser light beam L2 and the red laser light beam L3 emitted from the dichroic film 3 are combined into an output light beam. The output light beam can be used as the output light beam of the light source and can be used to transmit to the next optical system, such as a projection light core. The fluorescent light beam F2 can be a green fluorescent light beam, and the output light beam can be used to achieve full-color display.

[0116] exist Figure 4 In the light source shown, the laser beam in the output beam (especially the red laser beam L3 with a longer wavelength) will cause speckle phenomenon in the projected image. Speckle is manifested as irregular intensity distribution when the laser is reflected, scattered, and transmitted from a rough surface, resulting in random granular distribution of spots, which causes a poor subjective experience for the human eye. The diffusion components introduced above can be referred to Figure 5 The diffuser member 10 is shown. And Figure 4 The light sources shown are different. Figure 5 In the light source shown, a diffusion component 10 is additionally provided in the optical path of the blue laser beam L2 and the red laser beam L3, which is conducive to increasing the random phase of the blue laser beam L2 and the red laser beam L3 in space, reducing the coherence of the laser beams, and reducing the speckle phenomenon on the image projected by the light source. In addition, since the diffusion component 10 is provided in the optical path before the blue laser beam L2 and the red laser beam L3 are combined with the fluorescent beam F2, it is conducive to reducing the number of optical devices passed by the fluorescent beam F2, thereby helping to reduce the efficiency loss of the fluorescent beam F2, shortening the transmission distance of the fluorescent beam F2, and further reducing the spot size of the output beam, thereby helping to reduce the volume of the next-level optical system.

[0117] In order to ensure that the mixed laser beam is incident on the surface of the moving diffusion component, the surface area of ​​the diffusion component is generally set to be much larger than the spot area of ​​the mixed laser beam. Optionally, the light source also includes a first beam shaping device, which is located in the optical path of the mixed laser beam before the diffusion component and is used to reduce the spot area of ​​the mixed laser beam, thereby facilitating the reduction of the surface area of ​​the diffusion component and the volume of the light source.

[0118] The mixed laser beam emitted from the first beam shaping device may be a collimated beam or a convergent beam, and accordingly, the first beam shaping device may be a collimated lens or a convergent lens. Taking the first beam shaping device as a convergent lens as an example, the diffusion component may be located at the convergent focus of the convergent lens. Figure 5 As shown, the first beam shaping device can be referred to as a convex lens 9.

[0119] The third optical device generally increases the divergence angle of the mixed laser beam while weakening the coherence of the mixed laser beam. Optionally, the light source further includes a second beam shaping device, which is located in the optical path of the mixed laser beam between the diffusion component and the first optical device. 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 (such as the first optical device). The second beam shaping device can be a collimating lens or a converging lens, such as Figure 5 Convex lens 11 is shown.

[0120] This application does not limit the relative positions of the components in the light source. Figure 3 to Figure 5 The light source shown schematically only shows the relative positions of the components. The light source provided in the present application may also include other components, such as a collimating component, a filter component, and the like.

[0121] This 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. Figure 4 In the light source shown, the incident angles of the blue laser beam L0 on the beam splitter 2, the incident angles of the blue laser beam L2 and the red laser beam 3 on the dichroic plate 8 are all 45°. Figure 5 In the light source shown, the incident angles of the blue laser beam L0 on the beam splitter 2, the blue laser beam L2 and the red laser beam 3 on the dichroic plate 8 are not 45° (for example, greater than 45°), which is beneficial to compressing the optical path of the laser beam and reducing the overall light source volume.

[0122] 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.

[0123] 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.

[0124] 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 spectroscopic device, a first optical device and a fluorescent device; The first laser is used to emit a laser beam; The optical splitter is used to separate the laser beam into a first laser beam and a second laser beam; A first optical device is used to transmit the first laser beam and the second laser beam respectively; The fluorescent device is used to receive the first laser beam from the first optical device, and emit a fluorescent beam to the first optical device under the stimulation of the first laser beam; The first optical device is further used to transmit the fluorescent light beam so that the fluorescent light beam and the second laser light beam are combined.

2. The light source according to claim 1, characterized in that The first optical device transmits the first laser beam and the second laser beam in a first manner, and the first optical device transmits the fluorescent beam in a second manner, wherein the first manner and the second manner are a reflection manner and a transmission manner, respectively, or the first manner and the second manner are a transmission manner and a reflection manner, respectively.

3. The light source according to claim 2, characterized in that The first optical device includes a dichroic plate.

4. The light source according to any one of claims 1 to 3, characterized in that: The light source also includes a second laser; The second laser is used to emit a third laser beam; The first optical device is further used to transmit the third laser beam, so that the third laser beam, the fluorescent beam and the second laser beam are combined.

5. The light source according to claim 4, characterized in that The light source further comprises a second optical device; The second optical device is located in an optical path of the second laser beam and the third laser beam before the first optical device, and is used for merging the second laser beam and the third laser beam.

6. The light source according to claim 5, characterized in that The second optics includes a dichroic plate.

7. The light source according to claim 5 or 6, characterized in that: The light source further comprises a third optical device; The third optical device is located in the optical path between the first optical device and the second optical device, and is used to weaken the coherence of the second laser beam and the third laser beam.

8. The light source according to any one of claims 1 to 7, characterized in that: The light source further includes one or more deflection devices, wherein the one or more deflection devices are located in the optical path of a target laser beam, wherein the target laser beam is the first laser beam or the second laser beam; The one or more deflection devices are used to change the propagation direction of the target laser beam.

9. A method, characterized in that The method is applied to a light source, the light source comprising a first laser, a spectroscopic device, a first optical device and a fluorescent device, and the method comprises: The first laser emits a laser beam; The optical splitter separates the laser beam into a first laser beam and a second laser beam; a first optical device transmitting the first laser beam and the second laser beam, respectively; The fluorescent device receives the first laser beam from the first optical device, and emits a fluorescent beam toward the first optical device under the stimulation of the first laser beam; The first optical device also transmits the fluorescent light beam so that the fluorescent light beam is combined with the second laser light beam.

10. The method according to claim 9, characterized in that The first optical device transmits the first laser beam and the second laser beam in a first manner, and the first optical device transmits the fluorescent beam in a second manner, wherein the first manner and the second manner are a reflection manner and a transmission manner, respectively, or the first manner and the second manner are a transmission manner and a reflection manner, respectively.

11. The method according to claim 9 or 10, 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 first optical device further transmits the third laser beam so that the third laser beam, the fluorescent beam and the second laser beam are combined.

12. The method according to claim 11, characterized in that The light source further includes a second optical device, the second optical device being located in an optical path of the second laser beam and the third laser beam before the first optical device, and the method further includes: The second optics combines the second laser beam and the third laser beam.

13. The method according to claim 12, characterized in that The light source further includes a third optical device, the third optical device being located in a light path between the first optical device and the second optical device, the method further including: The third optical device weakens the coherence of the second laser beam and the third laser beam.

14. The method according to any one of claims 9 to 13, characterized in that: The light source further includes one or more deflection devices, the one or more deflection devices are located in the optical path of a target laser beam, the target laser beam is the first laser beam or the second laser beam, and the method further includes: The one or more deflection devices change the propagation direction of the target laser beam.

15. 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.

16. A head-up display system, characterized in that: comprising a light deflection module and a projection system as claimed in claim 15; 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.

17. A lighting device, characterized in that: It comprises a fixing seat and the projection system as claimed in claim 15, wherein the fixing seat is used to fix the projection system.

18. 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 16 and / or includes the lighting device according to claim 17; 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.

Images