Light source, projection device, vehicle-mounted display system, and vehicle

Abstract

Provided in the present application are a light source, a projection device, a vehicle-mounted display system, and a vehicle. The light source comprises a laser emission unit, a fluorescence emission unit and a beam combiner, wherein the laser emission unit is configured to emit to the beam combiner a laser beam propagating in a first direction, the laser beam being in a first polarization state; the fluorescence emission unit is configured to emit to the beam combiner a fluorescence beam propagating in a second direction, the fluorescence beam comprising a first fluorescence beam in the first polarization state and a second fluorescence beam in a second polarization state; and the beam combiner is configured to receive the laser beam and the fluorescence beam, and perform polarization beam combining on the laser beam and the second fluorescence beam, so as to obtain a first mixed beam. A polarization light combining scheme is incorporated into a light source architecture in which laser and fluorescence are mixed, thereby realizing a low-energy-loss laser and fluorescence mixing scheme.

Description

A light source, projection device, vehicle-mounted display system and vehicle

[0001] The present application claims priority to the Chinese patent application No. 202410432924.2, filed on April 8, 2024, entitled "A light source, projection device, vehicle-mounted display system and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of projection display, in particular to a light source, projection device, vehicle-mounted display system and vehicle. BACKGROUND

[0003] With the society entering the multimedia information era, the types of information have been changed from single digital text to multimedia forms mainly including images and sounds. As the main carrier of image information, with the development of laser and display chip semiconductor technology, the display projection device has been widely used.

[0004] Currently, the light source schemes used in the projection display system include mercury lamp, three-color laser, advanced laser phosphor display (ALPD) technology, etc. Among them, the ALPD technology avoids the speckle problem caused by the high coherence of the laser light source by mixing laser and phosphor, and has the advantages of low cost, high brightness, wide color gamut, and no speckle. However, in the current laser and phosphor mixing scheme, spatial light mixing or spectral light mixing is usually used to mix laser and phosphor, and both schemes will cause energy loss after light mixing. Therefore, how to realize a low-energy-loss laser and phosphor mixing scheme is a technical problem to be solved. SUMMARY

[0005] The present application provides a light source, projection device, vehicle-mounted display system and vehicle, by adding a polarization light mixing scheme in the light source architecture of laser and phosphor mixing, a low-energy-loss laser and phosphor mixing scheme is realized.

[0006] In a first aspect, a light source is provided, comprising a laser emission unit, a fluorescent emission unit, and a beam combiner, wherein: the laser emission unit is configured to emit a laser beam propagating along a first direction to the beam combiner, the laser beam being of a first polarization state; the fluorescent emission unit is configured to emit a fluorescent beam propagating along a second direction to the beam combiner, the fluorescent beam comprising a first fluorescent beam of the first polarization state and a second fluorescent beam of a second polarization state, wherein the first polarization state and the second polarization state are different, and the first direction and the second direction are non-parallel; and the beam combiner is configured to receive the laser beam and the fluorescent beam, and to perform polarization beam combining on the laser beam and the second fluorescent beam to obtain a first mixed beam. Thus, by emitting a laser light source with a polarization state, and performing polarization beam combining on the laser light source and a fluorescent light source, a technical solution different from existing spectral beam combining and spatial beam combining is provided. In this case, since the laser light source has a polarization state, most of the laser polarization energy (e.g., >96%) is preserved after beam combining, and the fluorescent light source only loses part of the light flux or energy component of the same polarization state as the laser light source, thereby reducing the energy loss after beam combining.

[0007] With reference to the first aspect, in some implementations of the first aspect, a wavelength range of the laser beam and the fluorescent beam overlaps; and / or a receiving area of the laser beam and the fluorescent beam on the beam combiner overlaps.

[0008] With reference to the first aspect, in some implementations of the first aspect, the beam combiner is a dichroic mirror, wherein performing polarization beam combining on the laser beam and the fluorescent beam comprises: the dichroic mirror transmitting the laser beam and reflecting the second fluorescent beam; or the dichroic mirror reflecting the laser beam and transmitting the second fluorescent beam.

[0009] With reference to the first aspect, in some implementations of the first aspect, the fluorescent beam further comprises a third fluorescent beam of a first wavelength range and a fourth fluorescent beam of a second wavelength range, wherein the first wavelength range overlaps with the wavelength range of the laser beam, and the second wavelength range does not overlap with the wavelength range of the laser beam; and the dichroic mirror is further configured to perform wavelength beam combining on the fourth fluorescent beam and the laser beam to obtain a second mixed beam. In the above polarization beam combining scheme, since the fluorescent beam comprises two polarization states, part of the light flux or energy component of the same polarization state as the laser light source is lost. However, by combining the polarization beam combining and the spectral beam combining, the part of the light flux or energy component of the same polarization state as the laser light source in the fluorescent light source can be further combined, thereby reducing the energy loss.

[0010] With reference to the first aspect, in some implementations of the first aspect, the dichroic mirror comprises a first region and a second region, the first region and the second region are non-overlapping, the fluorescent light beams further comprise a fifth fluorescent light beam and a sixth fluorescent light beam, the first region is configured to receive the laser light beam and the fifth fluorescent light beam, the second region is configured to receive the sixth fluorescent light beam; and the dichroic mirror is further configured to spatially combine the laser light beam and the sixth fluorescent light beam to obtain a third mixed light beam. In the above polarization combining scheme, since the fluorescent light beams comprise two polarization states, part of the light flux or energy component with the same polarization state as the laser light source is lost. By using the combination of the polarization combining and the spatial combining, the part of the light flux or energy component with the same polarization state as the laser light source in the fluorescent light source can be further combined, and the energy loss is reduced.

[0011] With reference to the first aspect, in some implementations of the first aspect, the laser light beam comprises at least one of the following wavelength ranges: a red wavelength range, a green wavelength range, or a blue wavelength range.

[0012] With reference to the first aspect, in some implementations of the first aspect, the laser light beam comprises the following wavelength ranges: a red wavelength range, a green wavelength range, and a blue wavelength range; and the laser light beam comprises a first laser light beam and a second laser light beam, the wavelength ranges of the first laser light beam and the second laser light beam overlap. Thus, a four-color laser light source is provided, which comprises two laser light beams with partially overlapping wavelength ranges, and the light source further enriches the color and improves the brightness when used in a projector. The two beam direction control elements, i.e., the dichroic mirror and the reflector, are used to fold the optical path, and the overall volume of the laser emitting unit is reduced.

[0013] With reference to the first aspect, in some implementations of the first aspect, the laser emitting unit comprises a first beam direction control element and a second beam direction control element, the first beam direction control element is a dichroic mirror or a reflector, and the second beam direction control element is a dichroic mirror or a reflector, wherein: the first beam direction control element and the second beam direction control element are arranged along a third direction, and the second beam direction control element and the beam combiner are arranged along a first direction, wherein the first direction and the third direction are non-parallel; and the first beam direction control element and the second beam direction control element are configured to control the direction of a third laser light beam included in the laser light beam, so that the third laser light beam propagates along the first direction.

[0014] In a possible implementation of the first aspect, the laser emission unit includes a first laser, and the first laser is configured to generate a fourth laser beam. The laser beam includes the fourth laser beam. The fluorescence emission unit includes a second laser and a fluorescent body. The second laser is configured to generate a fifth laser beam. The fifth laser beam is configured to excite the fluorescent body to generate a fluorescence beam. The first laser and the second laser are the same laser. That is, the laser emission unit can multiplex the laser with the fluorescence emission unit, thereby reducing the overall energy consumption of the light source.

[0015] In a second aspect, a projection device is provided. The projection device includes the light source, the modulator, and the lens of any possible implementation of the first aspect. The light source is configured to emit a mixed beam. The modulator is configured to modulate the mixed beam to obtain an optical signal. The lens is configured to transmit the optical signal to display a projection picture.

[0016] In a third aspect, a vehicle display system is provided. The vehicle display system includes the projection device of the second aspect.

[0017] In a fourth aspect, a vehicle is provided. The vehicle includes the vehicle display system of the third aspect. BRIEF DESCRIPTION OF DRAWINGS

[0018] FIG. 1 is a schematic diagram of a light source according to an embodiment of the present application.

[0019] FIG. 2 is a schematic diagram of a laser emission unit according to an embodiment of the present application.

[0020] FIG. 3 is a schematic diagram of a fluorescence emission unit according to an embodiment of the present application.

[0021] FIG. 4 is a schematic diagram of a first light source architecture according to an embodiment of the present application.

[0022] FIG. 5 is a reflectance spectrum and a transmittance spectrum of a beam combiner according to an embodiment of the present application.

[0023] FIG. 6 is a schematic diagram of a second light source architecture according to an embodiment of the present application.

[0024] FIG. 7 is a reflectance spectrum and a transmittance spectrum of a beam combiner according to an embodiment of the present application.

[0025] FIG. 8 is a schematic diagram of a third light source architecture according to an embodiment of the present application.

[0026] FIG. 9 is a schematic diagram of a projection device according to an embodiment of the present application.

[0027] FIG. 10 is a schematic diagram of a vehicle display system according to an embodiment of the present application.

[0028] FIG. 11 is a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The technical solutions in the present application will be described below with reference to the drawings.

[0030] Hereinafter, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0031] In the present specification, the phrase "one embodiment" or "some embodiments" etc. means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in further some embodiments" etc. appearing in different places in the present specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprise", "include", "have" and their conjugates mean "including but not limited to", unless otherwise specifically emphasized.

[0032] In the description of the embodiments of the present application, the terms "upper", "lower", "vertical", "horizontal" and the like indicate the orientation or positional relationship defined with respect to the orientation or position in which the components are placed in the drawings. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, but do not indicate or imply that the device or component must have a specific orientation or be constructed and operated in a specific orientation, which can be changed accordingly according to the orientation of the components placed in the drawings, and therefore should not be understood as a limitation of the present application.

[0033] In the embodiments of the present application shown below, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to the process, method, product or device.

[0034] In the embodiments of the present application, the words "exemplary" or "for example" are used to mean example, instance, or illustration, embodiments or design schemes described as "exemplary" or "for example" should not be interpreted as being more preferred or advantageous than other embodiments or design schemes. The words "exemplary" or "for example" are intended to present the relevant concept in a specific manner for understanding.

[0035] With the society entering the multimedia information era, the types of information are changing from single digital text to multimedia forms mainly in images and sounds. As the main carrier of image information, with the development of laser and display chip semiconductor technology, the display projection device is becoming more and more popular.

[0036] Currently, the light source schemes used in the projection display system include mercury lamp, three-color laser, and advanced laser phosphor display (ALPD) technology. The mercury lamp light source is the mainstream light source in the early stage of the development of the projection system, but it is gradually replaced by other light source types due to its very short service life, high heat generation, and low light power density. The red-green-blue three-color laser scheme can cover Bt.2020, and the red-green-blue channels are all pure laser light sources. Due to the high coherence characteristics, the "speckle" problem of grainy feeling is brought, and long-term viewing causes visual fatigue. In order to suppress laser speckle, the cost, volume, and brightness need to be paid, which is the pain point of the pure laser light source scheme. In order to reduce laser speckle while maintaining high-brightness and wide-gamut projection experience, some projection manufacturers have introduced a "mixed light" light source: laser mixed with fluorescent light.

[0037] The fluorescent laser display avoids the speckle problem caused by the high coherence of the laser light source through the scheme of mixing laser with fluorescent light. The color gamut coverage of the red-blue laser plus green fluorescent light source type is generally 95% DCI-P3. That is, the fluorescent laser display has the advantages of low cost, high brightness, wide color gamut, and no speckle. In the current laser mixed fluorescent light scheme, spatial light mixing or spectral light mixing is usually used to mix laser and fluorescent light. However, since the fluorescent light source is usually Lambertian and has a wide spectrum, the laser spectrum (such as red laser and green laser) is easy to overlap with the fluorescent spectrum. Due to the partial overlap of the laser spectrum and the fluorescent / LED spectrum, the industry mainly uses spatial light mixing or spectral light mixing to realize the fusion of laser and fluorescent / LED. The above two schemes will cause energy loss after light mixing. Therefore, how to realize a low-energy-loss laser and fluorescent light mixing scheme is a technical problem to be solved.

[0038] In view of this, the embodiments of the present application provide a light source, a projection device, a vehicle-mounted display system, and a vehicle, which add a polarization light mixing scheme to the light source architecture of laser and fluorescent light mixing, thereby realizing a low-energy-loss laser and fluorescent light mixing scheme.

[0039] FIG. 1 is a schematic diagram of a light source according to an embodiment of the present application. As shown in FIG. 1, the light source includes a laser emission unit 110, a fluorescent light emission unit 120, and a beam combiner 130.

[0040] The laser emission unit 110 is configured to emit a laser beam propagating along a first direction to the beam combiner 130, and the laser beam is in a first polarization state.

[0041] The laser emitting unit 110 can include one or more lasers, and each laser can include one or more laser emitting chips. The laser emitting chips can be configured to emit laser beams with a wavelength range greater than or equal to 380 nm and less than or equal to 740 nm. In some implementations, the laser emitting chips are configured to emit at least one wavelength range of laser beams, and the at least one wavelength range of laser beams includes at least one of a red wavelength range, a green wavelength range, and a blue wavelength range. The red wavelength range can refer to a wavelength range greater than or equal to 615 nm and less than or equal to 665 nm. The green wavelength range can refer to a wavelength range greater than or equal to 500 nm and less than or equal to 560 nm. The blue wavelength range can refer to a wavelength range greater than or equal to 420 nm and less than or equal to 480 nm.

[0042] In some implementations, the laser emitting unit 110 further includes one or more lenses, and a lens of the one or more lenses can be disposed in a laser beam propagation path of the above-mentioned laser, and the lens can be specifically configured to perform functions such as collimation or focusing on the laser beams emitted by the above-mentioned laser.

[0043] In some implementations, the laser emitting unit 110 further includes one or more wave plates, polarizers, or other polarization devices, and the polarization devices are configured to change the polarization state of the laser beams so that the laser beams are incident on the beam combiner 130 with a first polarization state.

[0044] In addition, the laser emitting unit 110 can further be provided with a laser speckle eliminator or other optical device. The specific composition of the laser emitting unit 110 is described in conjunction with the subsequent drawings.

[0045] It should be understood that the “propagating in the first direction” referred to in the present application is only used to limit the direction of the laser beams when the laser beams are incident on the beam combiner 130, and is not a limitation on the direction of the laser beams emitted by the one or more lasers in the laser emitting unit 110. In some implementations, the laser emitting unit 110 further includes one or more mirrors and dichroic mirrors, and the one or more mirrors and dichroic mirrors can be disposed in a laser emitting path of the above-mentioned laser. The mirrors and dichroic mirrors can be specifically configured to control the laser beams so that the laser beams are incident on the beam combiner 130 from the first direction.

[0046] The fluorescence emission unit 120 is configured to emit a fluorescence light beam propagating along a second direction to the beam combiner 130. The fluorescence light beam comprises a first fluorescence light beam of a first polarization state and a second fluorescence light beam of a second polarization state, wherein the first polarization state and the second polarization state are different, and the first direction and the second direction are non-parallel. The specific form of the fluorescence emission unit 120 is described in connection with the subsequent drawings. Wherein, “the fluorescence light beam comprises a first fluorescence light beam of a first polarization state and a second fluorescence light beam of a second polarization state” can also be understood as “the fluorescence light beam contains a first fluorescence light beam of a first polarization state and a second fluorescence light beam of a second polarization state”, or “the fluorescence light beam can be decomposed into a first fluorescence light beam of a first polarization state and a second fluorescence light beam of a second polarization state”. Wherein, the first polarization state can be perpendicular to the second polarization state.

[0047] It should be understood that “propagating along a second direction” referred to in the present application is only used to limit the direction of the fluorescence light beam when it is incident on the beam combiner 130, and does not limit the direction of the fluorescence light beam when the fluorescent body in the fluorescence emission unit 120 emits the fluorescence light beam.

[0048] The beam combiner 130 is configured to receive the laser light beam and the fluorescence light beam, and to perform polarization beam combining on the laser light beam and the second fluorescence light beam to obtain a first mixed light beam. Wherein, the specific form of the beam combiner 130 is determined according to the actual situation. The beam combiner 130 can be understood as a polarization beam splitter, a polarization beam combiner / splitter, a polarization filter, etc. The beam combiner 130 can be in the form of a dichroic mirror, and part or all of the area of the dichroic mirror can be coated with a polarization film. In addition, the beam combiner 130 can also be in the form of a prism, and the present application does not make any limitation thereon. In some implementations, the arrangement angle of the dichroic mirror is 45 degrees.

[0049] In some implementations, as shown in (a) of FIG. 1, the dichroic mirror transmits the laser light beam, and the dichroic mirror reflects the second fluorescence light beam, so as to perform polarization beam combining on the laser light beam and the second fluorescence light beam.

[0050] In some implementations, as shown in (b) of FIG. 1, the dichroic mirror reflects the laser light beam, and the dichroic mirror transmits the second fluorescence light beam, so as to perform polarization beam combining on the laser light beam and the second fluorescence light beam.

[0051] In the light source as shown in FIG. 1, the first polarization state can be a P-polarization state, and the second polarization state can be an S-polarization state. Alternatively, the first polarization state can be an S-polarization state, and the second polarization state can be a P-polarization state. The laser beam / fluorescent beam of the first polarization state and the laser beam / fluorescent beam of the second polarization state referred to in the present application can be understood as linearly polarized light, i.e., the trajectory of the end point of the light vector is a straight line, and the vibration plane of the linearly polarized light is fixed and does not rotate. In linearly polarized light, the plane formed by the incident light ray and the normal at the point of incidence is the incidence plane. If the electric vector vibration direction of the light ray is in the incidence plane, it is called a P-polarization state. If the electric vector vibration direction of the light ray is perpendicular to the incidence plane, it is called an S-polarization state.

[0052] In the light source as shown in FIG. 1, there can be a case where the wavelength range of the laser beam and the wavelength range of the fluorescent beam incident on the beam combiner partially or entirely overlap, and / or the receiving area of the laser beam and the receiving area of the fluorescent beam on the beam combiner partially or entirely overlap. By emitting a laser light source with a polarization state and combining the laser light source with the fluorescent light source by polarization, a technical solution different from the existing spectral light combination and spatial light combination is provided. In this case, since the laser light source has a polarization state, most of the laser polarization energy (e.g., >96%) is retained after the combination, and the fluorescent light source only loses part of the light flux or energy component of the same polarization state as the laser light source, thereby reducing the energy loss after the light combination.

[0053] In addition, in this case, the beam combiner can also be further structurally designed to further reduce the energy loss after the light combination.

[0054] In some implementations, the fluorescent beam incident on the beam combiner (dichroic mirror) further includes a third fluorescent beam of a first wavelength range and a fourth fluorescent beam of a second wavelength range. The first wavelength range overlaps with the wavelength range of the laser beam, and the second wavelength range does not overlap with the wavelength range of the laser beam. The dichroic mirror is further configured to combine the fourth fluorescent beam and the laser beam by wavelength to obtain a second mixed beam. That is, in addition to the partial or entire area of the dichroic mirror being coated with a polarization film, a partial or entire area of the dichroic mirror can also be coated with a filter film. The filter film is configured to transmit the fourth fluorescent beam and reflect the laser beam. Alternatively, the filter film is configured to reflect the fourth fluorescent beam and transmit the laser beam.

[0055] In the above-mentioned polarization combining scheme, since the fluorescent light beam includes two polarization states, part of the light flux or energy component of the same polarization state as the laser light source is lost. Through the combination of polarization combining and spectral combining, for example, a filter film is first coated on the dichroic mirror, and the dichroic mirror can combine the laser light beam and the fluorescent light beam in different wavelength ranges. The spectral combining scheme has a fluorescent light loss of B%, B% = P1 / P2, where P1 is the luminance of the laser wavelength band in the fluorescent spectrum, and P2 is the total luminance of the fluorescent light. By coating a polarization film at the wavelength range overlap on the dichroic mirror, the part of the light flux or energy component of the fluorescent light source with a different polarization state from the laser light source can be further combined, thereby reducing energy loss.

[0056] In some implementations, the fluorescent light beam incident on the beam combiner (dichroic mirror) further includes a fifth fluorescent light beam and a sixth fluorescent light beam. The beam combiner (dichroic mirror) includes a first region 140 and a second region 150, which do not overlap. The first region 140 is configured to receive the laser light beam and the fifth fluorescent light beam. The second region 150 is configured to receive the sixth fluorescent light beam. The dichroic mirror is further configured to spatially combine the laser light beam and the sixth fluorescent light beam to obtain a third mixed light beam. For example, a hole can be provided in the first region 140, so that the first region 140 directly transmits the laser light beam after receiving the laser light beam, and the second region 150 reflects the sixth fluorescent light beam after receiving the sixth fluorescent light beam. FIG. 1(c) specifically shows the arrangement position of the first region 140 and the second region 150 in the dichroic mirror. In addition, according to the specific position of the incident dichroic mirror, the first region 140 and the second region 150 can also have other arrangement schemes, which are determined according to actual conditions.

[0057] In the above-mentioned polarization combining scheme, since the fluorescent light beam includes two polarization states, part of the light flux or energy component of the same polarization state as the laser light source is lost. Through the combination of polarization combining and spatial combining, for example, a hole is first provided on the dichroic mirror, the hole is configured to transmit the laser light beam, and the remaining part of the dichroic mirror is configured to reflect the fluorescent light beam. Since the hole transmits the fluorescent light beam, part of the light flux or energy component of the fluorescent light beam is lost. The spatial combining scheme has a fluorescent light loss of A%, A% = S1 / S2, where S1 is the laser spot size at the beam combining sheet, and S2 is the fluorescent spot size at the beam combining sheet. By coating a polarization combining film on the hole region, the part of the light flux or energy component of the fluorescent light source with the same polarization state as the laser light source in the hole region can be further combined, thereby reducing energy loss.

[0058] In addition, the light combining scheme shown in FIG. 1 can also be used to combine laser light and light emitting diode light sources, which is not limited in the present application.

[0059] FIG. 2 is a schematic diagram of a laser emitting unit according to an embodiment of the present application.

[0060] As shown in FIG2 (a), the laser emitting unit may include a three-color laser 210, which includes a red laser emitting chip 211, a blue laser emitting chip 212, and a green laser emitting chip 213. That is, the laser emitting unit may be used to emit red light in the wavelength range λ R 、Green light wavelength range λ G And the blue light wavelength range λ B The laser beam has a first polarization state. Thus, a three-color laser light source is provided, which can provide a light source solution with concentrated direction, rich colors and high brightness when used in a projection instrument.

[0061] As shown in FIG2(b), the laser emitting unit includes a red laser 220, a blue laser 230, and a dichroic mirror 240. The red laser 220 includes a red laser emitting chip 221, which is used to emit red light in the wavelength range λ R The laser beam, the λ R The laser beam is in the first polarization state. The blue laser 230 includes a blue laser emitting chip 231, which is used to emit blue light in the wavelength range λ B The laser beam, the λ B The laser beam is in the second polarization state. The dichroic mirror 240 is used to receive λ R The laser beam transmits the R The laser beam, λ R The laser beam is still in the first polarization state. The dichroic mirror 240 is also used to receive λ B The laser beam reflects the B Thus, the laser beam emitted by the laser emitting unit includes λ R The laser beam and λ B The laser beam is in a first polarization state. Furthermore, the fluorescent light emitting unit in the light source architecture can be configured to emit a fluorescent light beam encompassing a green wavelength range. That is, the laser light emitting unit and the fluorescent light emitting unit are configured to emit laser light beams encompassing a red wavelength range, a green wavelength range, and a blue wavelength range. This provides a light source that utilizes laser and fluorescent light to create a tri-color light source, capable of providing a rich color palette when used in a projection device.

[0062] As shown in FIG2(c), the laser emitting unit includes a blue laser 230, a three-color laser 250, a dichroic mirror 260, and a reflector 270. The laser chips included in the blue laser 230 and the three-color laser 250 are similar to those in FIG2(a) and (b), and are not described here. The blue laser is used to emit blue light in the wavelength range λ B1 The laser beam, λ B1The laser beam is in the first polarization state. The three-color laser is used to emit three-color laser beams, which include red light in the wavelength range λ R 、Green light wavelength range λ G And the blue light wavelength range λ B2 The three-color laser beam is in the second polarization state. The dichroic mirror is used to transmit the three-color laser beam. And the dichroic mirror is used to reflect λ B1 The reflector is used to reflect the three-color laser beam and λ B1 Laser beam, three-color laser beam and λ B1 The laser beams are all transformed into the first polarization state. Thus, the laser beams emitted by the laser emitting unit include λ B1 The laser beam, λ B2 The laser beam, λ R The laser beam, λ G The laser beam is in the first polarization state. Thus, a four-color laser light source is provided, comprising two laser beams with partially overlapping wavelength ranges. When used in a projection device, this further enriches the color of the light source and improves brightness. Furthermore, by providing two beam direction control elements, a dichroic mirror and a reflector, the optical path is folded, reducing the overall volume of the laser emitting unit.

[0063] In addition, in the embodiment of FIG. 2 , it is also possible to limit only the laser beam emitted by the red laser emitting chip (eg, λ R ), and / or the laser beam emitted by the green laser emitting chip (e.g. λ G ) polarization state. Without limiting the laser beam emitted by the blue laser emitting chip (such as λ B1 ,λ B2 Since the fluorescent light beam emitted by the fluorescent light emitting unit and the laser light beam emitted by the laser emitting unit do not overlap in the blue light wavelength range, the laser light beam emitted by the blue light laser emitting chip (for example, λ B1 ,λ B2 ) and fluorescent light beams for light combination.

[0064] In addition, in the embodiment of Figure 2 above, it is also possible to limit only the polarization state of the laser beam and the fluorescent beam in the overlapping part of the receiving area of ​​the beam combiner. Since the fluorescent beam emitted by the fluorescent emission unit and the laser beam emitted by the laser emission unit do not overlap in the receiving area of ​​the beam combiner, the laser beam and the fluorescent beam can be combined using spatial light combining.

[0065] In addition, the laser emitting unit may be in other forms, which will not be described in detail here.

[0066] FIG3 is a schematic diagram of a fluorescence emission unit provided in an embodiment of the present application. The fluorescence emission unit may include a laser 310 and a phosphor 320. Laser 310 is configured to emit a laser beam. Upon entering phosphor 320, the laser beam is excited to emit a fluorescence beam. Specifically, laser 310 may be configured to emit a laser beam in the blue wavelength range. The fluorescence beam may be broadband light, meaning it includes beams in multiple wavelength ranges. The fluorescence beam may be Lambertian light.

[0067] In some implementations, as shown in FIG3(a), a laser 310 emits a laser beam toward the back of a phosphor 320, causing the phosphor 320 to emit a fluorescent beam. A first lens group, comprising lenses 331 and 332, may be positioned in the path of the fluorescent beam emitted by the phosphor 320. The first lens group is configured to collimate the fluorescent beam. Exciting the fluorescent beam from the back improves its excitation efficiency.

[0068] In some implementations, as shown in FIG3( b ), a laser 310 emits a laser beam toward the front of a phosphor 320, causing the phosphor 320 to be stimulated to emit a fluorescent beam. A second lens group, comprising lenses 341 and 342, may be provided in the path of the laser beam emitted by the laser 310. The second lens group is used to focus the laser light. A third lens group, comprising lenses 351 and 352, may be provided in the path of the fluorescent beam emitted by the phosphor 320. The third lens group is used to collimate the fluorescent beam.

[0069] In addition, the fluorescent light emitting unit may also generate the fluorescent light beam in other ways, and this application does not limit this.

[0070] In addition, the laser emitting unit can reuse the laser with the fluorescent emitting unit, thereby reducing the overall energy consumption of the light source. This solution is described in conjunction with the following specific embodiments.

[0071] FIG4 is a schematic diagram of a first light source architecture provided in an embodiment of the present application. As shown in FIG4 , the light source includes a laser emitting unit, a fluorescent emitting unit, and a beam combiner 480 .

[0072] The laser emitting unit includes a blue laser 410, a three-color laser 420, a beam splitter 450, a dichroic mirror 430, and a reflector 440. The blue laser 410 is used to emit blue light in the wavelength range λ B1 The laser beam, λ B1 The laser beam is in the first polarization state. B1 The three-color laser 420 is used to emit three-color laser beams, which include red light with a wavelength range of λ R 、Green light wavelength range λG and a blue wavelength range λ B2 The three-color laser beam is of a second polarization state. R may be 640nm-650nm, λ G may be 525nm, λ B2 may be 465nm.

[0073] The mirror 440 is arranged along a first direction. The dichroic mirror 430, the beam splitter 450, and the combiner 480 are arranged along a third direction. The third direction and the first direction are non-parallel. B1 The laser beam of the blue wavelength range λ B1 is split by the beam splitter 450 into a first part of the laser beam of the blue wavelength range λ B1 and a second part of the laser beam of the blue wavelength range λ B1 The first part of the laser beam of the blue wavelength range λ B1 is reflected after passing through the dichroic mirror 430. Then, the first part of the laser beam of the blue wavelength range λ B1 is reflected again after passing through the mirror 440. The three-color laser beam is transmitted by the dichroic mirror 430. Then, the three-color laser beam is reflected by the mirror 440. Thus, the laser emission unit emits the laser beam including the first part of the laser beam of the blue wavelength range λ B1 and the three-color laser beam to the combiner, and the laser beam is of a first polarization state.

[0074] The fluorescent emission unit includes the blue laser 410, a lens group, and the fluorescent body 470. The lens group includes the lens 461 and the lens group 462. The beam splitter 450, the combiner 480, and the fluorescent body 470 are arranged along a third direction. The second part of the laser beam of the blue wavelength range λ B1 is transmitted by the combiner 480. The second part of the laser beam of the blue wavelength range λ B1 is focused by the lens group and then enters the fluorescent body 470 to generate a fluorescent beam. The fluorescent beam can cover a wide spectrum of wavelengths of 480nm-680nm. The fluorescent beam is collimated again by the lens group. Thus, the fluorescent emission unit emits the fluorescent beam to the combiner, and the fluorescent beam can be decomposed into a first polarization state and a second polarization state. After receiving the laser beam emitted by the laser emission unit, the combiner transmits the laser beam. After receiving the fluorescent beam, the combiner reflects a part of the fluorescent beam of the second polarization state. Thus, the laser beam and the fluorescent beam of the second polarization state are combined into a mixed beam. In some implementations, the combiner can also be used for polarization combining and wavelength combining of the laser beam and the fluorescent beam.

[0075] For example, in the embodiment of FIG. 4, only the laser beam (e.g., λR ) and / or the polarization state of the laser beam (e.g., λ G ) emitted by the green laser emission chip. The polarization state of the laser beam (e.g., λ B1 , λ B2 ) emitted by the blue laser emission chip is not limited. Since the fluorescent light beam emitted by the fluorescent light emission unit and the laser beam emitted by the laser emission unit do not overlap in the blue wavelength range, the laser beam (e.g., λ B1 , λ B2 ) emitted by the blue laser emission chip and the fluorescent light beam can be combined by spectral combining.

[0076] For example, in the embodiment of FIG. 4 described above, only the polarization state of the light beams in the overlapping part of the laser beam and the fluorescent light beam in the receiving area of the combiner can be limited, and since the fluorescent light beam emitted by the fluorescent light emission unit and the laser beam emitted by the laser emission unit do not overlap in the receiving area of the combiner, the laser beam and the fluorescent light beam can be combined by spatial combining.

[0077] FIG. 5 is a diagram of the reflection spectrum and the transmission spectrum of the combiner according to an embodiment of the present application. FIG. 5 corresponds to the specific embodiment in FIG. 4. The combiner can be a dichroic mirror, and the entire surface of the dichroic mirror is coated with a filter film. The filter film is used for wavelength combining of the laser beam and the fluorescent light beam. The filter film is used for transmitting the laser beam, and the filter film is used for reflecting the part of the fluorescent light beam that does not overlap in wavelength with the laser beam. In addition, part of the area of the dichroic mirror is coated with a polarizing film. The polarizing film is used for transmitting light of a first polarization state, and is used for reflecting light of a second polarization state. The first polarization state is P polarization state, and the second polarization state is S polarization state.

[0078] As shown in the transmission spectrum of (a) in FIG. 5, the curve R is a laser beam with a wavelength of λ R (640nm-650nm), the curve G is a laser beam with a wavelength of λ G (525nm), the curve B-465 is a laser beam with a wavelength of λ B2 (465nm), and the curve B-455 is a laser beam with a wavelength of λ B1 (455nm). The transmittance of the above laser beams at the combiner is close to 1. According to the P light transmission spectrum, the laser beam of P polarization state is completely transmitted by the dichroic mirror.

[0079] As shown in the reflection spectrum of (b) in FIG. 5, the reflectivity of the light with a wavelength of about 480nm-520nm and 530nm-680nm is close to 1. That is, among the fluorescent light beams with a wavelength of 480nm-680nm, the fluorescent light beams with a wavelength in the range other than 520nm-530nm are reflected.

[0080] The dichroic mirror transmits λG The region of the laser beam of 520nm-530nm is plated with a polarized film. As shown in the P light reflection spectrum and S light reflection spectrum of (b) in FIG. 5, the dichroic mirror transmits the P polarization state of λ G 520nm-530nm and reflects the S polarization state of λ G 520nm-530nm. Thus, as shown by the incident fluorescence spectrum, the emitted fluorescence spectrum and the comprehensive reflection spectrum, only the P polarization state of the fluorescence beam of 520nm-530nm is lost, and the loss of the fluorescence beam of the green wavelength range of 520nm-530nm is reduced by half compared with the technical solution of only wavelength combining.

[0081] FIG. 6 is a schematic diagram of a second light source architecture provided by the embodiment of the present application. As shown in FIG. 6, the light source includes a laser emitting unit, a fluorescence emitting unit and a beam combiner 680.

[0082] The laser emitting unit includes a first blue laser 610, a red laser 620, a second blue laser 690, a beam splitter 650, a first dichroic mirror 630 and a second dichroic mirror 640. The first blue laser 610 is configured to emit a laser beam of a blue wavelength range λ B1 , the laser beam of λ B1 is of a first polarization state, the laser beam of λ B1 is of the first polarization state, and λ B1 may be 455nm. The red laser 620 is configured to emit a laser beam of a red wavelength range λ R , the laser beam of λ R is of a second polarization state, the laser beam of λ R may be 640nm-650nm. The second blue laser 690 is configured to emit a laser beam of a blue wavelength range λ B2 , the laser beam of λ B2 is of the second polarization state, and λ B2 may be 465nm.

[0083] The second dichroic mirror 640 is arranged along a third direction. The first dichroic mirror 630, the beam splitter 650 and the beam combiner 680 are arranged along a first direction. The third direction and the first direction are non-parallel. λ B1 The laser beam of λ B1 emitted from the first blue laser 610 is split by the beam splitter 650 into a first part of the laser beam of λ B1 and a second part of the laser beam of λ B1 . The first part of the laser beam of λ B1 is reflected after passing through the first dichroic mirror 630. Then, the first part of the laser beam of λ RThe laser beam of λ R is reflected after passing through the second dichroic mirror 640. B2 The laser beam of λ B1 is transmitted after passing through the second dichroic mirror 640. Thus, the laser emission unit emits the laser beam including the first part of the laser beam of λ R , the laser beam of λ B2 , and the laser beam of λ B1 to the beam combiner 680. The laser beam is in the first polarization state.

[0084] The fluorescence emission unit includes the first blue laser 610, the lens set, and the phosphor 670. The lens set includes the lens 661 and the lens 662. The beam splitter 650, the beam combiner 680, and the phosphor 670 are arranged along the first direction. The second part of the laser beam of λ B1 is transmitted after passing through the dichroic mirror. The second part of the laser beam of λ B1 is focused after passing through the lens set and enters the phosphor 670 to generate a fluorescence beam. The fluorescence beam can cover a wide spectrum of wavelengths from 480 nm to 680 nm. The fluorescence beam passes through the lens set again and is collimated. Thus, the fluorescence emission unit emits the fluorescence beam to the beam combiner 680, and the fluorescence beam can be decomposed into the first polarization state and the second polarization state.

[0085] The beam combiner 680 transmits the laser beam emitted by the laser emission unit after receiving the laser beam. The beam combiner 680 reflects the part of the second polarization state in the fluorescence beam after receiving the fluorescence beam. Thus, the laser beam and the fluorescence beam of the second polarization state are combined into a mixed beam. In some implementations, the beam combiner 680 can also be used for polarization combination and wavelength combination of the laser beam and the fluorescence beam.

[0086] For example, in the embodiment of FIG. 7 described above, the polarization state of the laser beam (e.g., λ R ) emitted by the red laser emission chip and / or the polarization state of the laser beam (e.g., λ G ) emitted by the green laser emission chip can also be limited. The polarization state of the laser beam (e.g., λ B1 , λ B2 ) emitted by the blue laser emission chip is not limited. Since the fluorescence beam emitted by the fluorescence emission unit and the laser beam emitted by the laser emission unit do not overlap in the blue wavelength range, the laser beam (e.g., λ B1 , λ B2 ) emitted by the blue laser emission chip and the fluorescence beam can be combined by spectral light combination.

[0087] For example, in the embodiment of FIG. 7, only the polarization state of the light beams overlapping in the receiving area of the combiner can be limited, and the laser light beams and the fluorescent light beams emitted by the fluorescent light emitting unit and the laser light emitting unit do not overlap in the receiving area of the combiner, so the laser light beams and the fluorescent light beams can be combined by spatial light combination.

[0088] FIG. 7 is a diagram of the reflection spectrum and the transmission spectrum of the combiner according to an embodiment of the present application. FIG. 7 corresponds to the specific embodiment in FIG. 6. The combiner can be a dichroic mirror, and the entire surface of the dichroic mirror is coated with a filter film. The filter film is used to combine the laser light beams and the fluorescent light beams by wavelength. The filter film is used to transmit the laser light beams, and the filter film is used to reflect the part of the fluorescent light beams that does not overlap with the laser light beams in wavelength. In addition, part of the area of the dichroic mirror is coated with a polarizing film. The polarizing film is used to transmit light of a first polarization state and reflect light of a second polarization state. The first polarization state is P polarization, and the second polarization state is S polarization.

[0089] As shown in the transmission spectrum of (a) in FIG. 7, curve R represents a laser light beam with a wavelength of λ R (640nm-650nm), curve B-465 represents a laser light beam with a wavelength of λ B2 (465nm), and curve B-455 represents a laser light beam with a wavelength of λ B1 (455nm). The transmittance of the above laser light beams at the combiner is close to 1. In addition, according to the P light transmission spectrum, the laser light beams of the P polarization state are all transmitted by the dichroic mirror.

[0090] As shown in the reflection spectrum of (b) in FIG. 7, the reflectivity of the light with a wavelength of about 480nm-630nm is close to 1. That is, among the fluorescent light beams with a wavelength of 480nm-680nm, the fluorescent light beams with a wavelength of 630nm-680nm are reflected, and the fluorescent light beams with a wavelength of 480nm-630nm are transmitted.

[0091] The area of the dichroic mirror that transmits the laser light beams with a wavelength of λ R (640nm-650nm) is coated with a polarizing film. As shown in the P light reflection spectrum and the S light reflection spectrum of (b) in FIG. 7, the dichroic mirror transmits the laser light beams with a wavelength of λ R (640nm-650nm) of the P polarization state and reflects the fluorescent light beams with a wavelength of λ R (640nm-650nm) of the S polarization state. Therefore, by comparing the incident fluorescent light spectrum, the outgoing fluorescent light spectrum, and the comprehensive reflection spectrum, it can be seen that only the fluorescent light beams with a wavelength of λ R (640nm-650nm) of the P polarization state are lost, and the loss of the fluorescent light beams with a wavelength of 640nm-650nm in the red light wavelength range is reduced by half compared with the technical solution of only combining the wavelengths.

[0092] FIG8 is a schematic diagram of a third light source architecture provided in an embodiment of the present application. As shown in FIG8 , the light source includes a laser emitting unit, a fluorescent emitting unit, and a beam combiner 880 .

[0093] The laser emitting unit includes a blue laser 810, a three-color laser 820, a beam splitter 850, a dichroic mirror 830, a first reflector 840, and a second reflector 890. The blue laser 810 is used to emit blue light in the wavelength range λ B1 The laser beam, λ B1 The laser beam is in the first polarization state. B1 The three-color laser 820 is used to emit three-color laser beams, which include red light with a wavelength range of λ R 、Green light wavelength range λ G And the blue light wavelength range λ B2 The three-color laser beam is in the second polarization state. R It can be 640nm~650nm, λ G Can be 525nm, λ B2 It can be 465nm.

[0094] The dichroic mirror 830 and the beam splitter 850 are arranged along the third direction, the first reflector 840 is arranged along the first direction, and the second reflector 890 and the beam combiner 880 are arranged along the third direction. B1 After the laser beam is emitted from the blue laser 810, it is split by the spectrometer 850 into the first part λ B1 The laser beam and the second part λ B1 The first part of the laser beam B1 The laser beam is reflected by the dichroic mirror 830. B1 The laser beam is reflected again after passing through the first reflector 840. B1 The three-color laser beam is reflected again by the second reflector 850. After the three-color laser beam is emitted from the three-color laser 820, it is transmitted by the dichroic mirror 830. Thereafter, the three-color laser beam is reflected by the first reflector 840. Thereafter, the three-color laser beam is reflected by the second reflector 850. Thus, the laser emitting unit emits a laser beam to the beam combiner, and the laser beam includes the first part of the λ B1 The laser beam and the three-color laser beam are in the second polarization state.

[0095] The fluorescence emission unit includes a blue laser 810, a lens group, and a fluorescent body 870. The lens group includes a lens 861 and a lens group 862. The beam splitter 850 and the beam combiner 880 are arranged along the third direction. The fluorescent body 870 is arranged along the first direction. The second part of the λ B1The laser beam of the second part λ B1 After the laser beam of the second part λ R is focused by the lens group, the laser beam enters the fluorescent body 870 to generate a fluorescent beam. The fluorescent beam can cover a wide spectrum of wavelengths from 480 nm to 680 nm. The fluorescent beam passes through the lens group again and is collimated. Thus, the fluorescent emission unit emits the fluorescent beam to the combiner, and the fluorescent beam can be decomposed into a first polarization state and a second polarization state.

[0096] After the combiner receives the laser beam emitted by the laser emission unit, the laser beam is reflected. After the combiner receives the fluorescent beam, the second polarization state of the fluorescent beam is transmitted. Thus, the laser beam and the fluorescent beam of the second polarization state are combined into a mixed beam.

[0097] In addition, in the embodiment of FIG. 8 described above, the polarization state of the laser beam (for example, λ R ) emitted by the red laser emission chip and / or the polarization state of the laser beam (for example, λ G ) emitted by the green laser emission chip can also be limited. The polarization state of the laser beam (for example, λ B1 , λ B2 ) emitted by the blue laser emission chip is not limited. Since the fluorescent beam emitted by the fluorescent emission unit and the laser beam emitted by the laser emission unit do not overlap in the blue wavelength range, the laser beam (for example, λ B1 , λ B2 ) emitted by the blue laser emission chip and the fluorescent beam can be combined by spectral combining.

[0098] In addition, in the embodiment of FIG. 8 described above, the polarization state of the laser beam and the fluorescent beam in the overlapping part of the receiving area of the combiner can also be limited. Since the fluorescent beam emitted by the fluorescent emission unit and the laser beam emitted by the laser emission unit do not overlap in the receiving area of the combiner, the laser beam and the fluorescent beam can be combined by spatial combining.

[0099] FIG. 9 is a structural schematic diagram of a projection device according to an embodiment of the present application. As shown in FIG. 9, the projection device includes the light source 910, the modulator 920 and the lens 930 shown in the above-described drawings.

[0100] The light source 910 is configured to emit a mixed beam.

[0101] The modulator 920 is configured to modulate the mixed light beam to obtain a light signal. The modulator 920 can be a liquid crystal on silicon (LCoS) modulator 920, which is a reflective spatial light modulator 920 having a function of changing the polarization direction of the incident linearly polarized light. Alternatively, the modulator 920 can be a reflective spatial light modulator 920 without the function of changing the polarization direction of the incident linearly polarized light, such as a micro-electro-mechanical system (MEMS) or a digital micro mirror device (DMD). In addition, the modulator 920 can also be a transmissive spatial light modulator 920, such as a liquid crystal display (LCD) and the like.

[0102] The lens 930 is configured to project the light signal to display a projection picture.

[0103] FIG. 10 is a schematic diagram of a vehicle display system according to an embodiment of the present application. As shown in FIG. 10, the vehicle display system mainly includes a host CPU 1001, an external memory interface 1002, an internal memory 1003, an audio module 1004, a video module 1005, a power module 1006, a wireless communication module 1007, an I / O interface 1008, a video interface 1009, and a projection device 1010. The host CPU 1001 can be connected to the peripheral elements such as the external memory interface 1002, the internal memory 1003, the audio module 1004, the video module 1005, the power module 1006, the wireless communication module 1007, the I / O interface 1008, the video interface 1009, and the projection device 1010 through a bus. The host CPU 1001 can be referred to as a front-end processor.

[0104] The host CPU 1001 includes one or more processing units, for example: the host CPU 1001 can include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units can be independent devices or integrated into one or more processors.

[0105] The main processor 1001 can also be provided with a memory for storing instructions and data. In some embodiments, the memory in the main processor 1001 is a cache memory. The memory can hold instructions or data that the main processor 1001 has just used or recycled. If the main processor 1001 needs to use the instructions or data again, it can be directly called from the memory. This avoids repeated access and reduces the waiting time of the main processor 1001, thereby improving the efficiency of the system.

[0106] The projection device 1010 can be any of the projection devices provided in the above embodiments. In some embodiments, the projection device 1010 can further include a plurality of input / output (I / O) interfaces 1008 connected to the main processor 1001. The interfaces 1008 can include an Inter-Integrated Circuit (I2C) interface, an Inter-Integrated Circuit Sound (I2S) interface, a Pulse Code Modulation (PCM) interface, a Universal Asynchronous Receiver / Transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a General-Purpose Input / Output (GPIO) interface, a Subscriber Identity Module (SIM) interface, and / or a Universal Serial Bus (USB) interface, etc. The above I / O interfaces 1008 can be connected to devices such as a mouse, a touchpad, a keyboard, a camera, a speaker / loudspeaker, a microphone, etc., and can also be connected to physical buttons (such as a volume button, a brightness adjustment button, a power button, etc.) on the projection device.

[0107] The external memory interface 1002 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the projection device. The external memory card communicates with the main processor 1001 through the external memory interface 1002 to realize data storage functions.

[0108] The internal memory 1003 can be used to store computer executable program codes including instructions. The internal memory 1003 can include a program storage area and a data storage area. The program storage area can store an operating system, at least one application required by a function (such as a call function, a time setting function, etc.), and the like. The data storage area can store data created during use of the projection device (such as a phone book, a world time, etc.), and the like. In addition, the internal memory 1003 can include a high-speed random access memory, and can further include a non-volatile memory such as at least one magnetic disk storage device, a flash memory device, a Universal Flash Storage (UFS), and the like. The main processor 1001 executes various function applications and data processing of the projection device by running instructions stored in the internal memory 1003 and / or instructions stored in a memory disposed in the main processor 1001.

[0109] The projection device can realize an audio function through the audio module 1004 and an application processor, etc. For example, music playing, calling, etc.

[0110] The audio module 1004 is used to convert digital audio information into an analog audio signal output, and is also used to convert an analog audio input into a digital audio signal. The audio module 1004 can also be used to encode and decode audio signals, such as playing or recording. In some embodiments, the audio module 1004 can be disposed in the main processor 1001, or part of the function modules of the audio module 1004 can be disposed in the main processor 1001.

[0111] The video interface 1009 can receive an externally input audio / video signal, which can be a High Definition Multimedia Interface (HDMI), a Digital Visual Interface (DVI), a Video Graphics Array (VGA), a Display port (DP), etc. The video interface 1009 can also output video externally. When the projection device is used as a vehicle display, the video interface 1009 can receive a speed signal and a power signal input by a peripheral device, and can also receive an externally input VR video signal. When the projection device is in use, the video interface 1009 can receive a video signal input by an external computer or terminal device.

[0112] The video module 1005 can decode the video input by the video interface 1009, for example, H.264 decoding. The video module can also encode the video collected by the projection device, for example, H.264 encoding of the video collected by the external camera. In addition, the main processor 1001 can also decode the video input by the video interface 1009, and then output the decoded image signal to the projection device 1010.

[0113] The projection device 1010 is used to display the corresponding image. In the embodiment, the video interface 1009 receives the externally input video source signal, and the video module 1005 outputs one or more image signals to the projection device 1010 after decoding and / or digitizing processing. The projection device 1010 images the incident light source according to the input image signal, and then outputs the image light. In addition, the main processor 1001 can also output one or more image signals to the projection device 1010.

[0114] The wireless communication module 1007 can enable the projection device to communicate with the outside world wirelessly. It can provide wireless local area network (WLAN) (such as wireless fidelity (Wi-Fi) network), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (IR) and other wireless communication solutions. The wireless communication module 1007 can be one or more devices integrated with at least one communication processing module. The wireless communication module 1007 receives electromagnetic waves via an antenna, frequency modulates and filters the electromagnetic wave signal, and sends the processed signal to the main processor 1001. The wireless communication module 1007 can also receive signals to be sent from the main processor 1001, frequency modulate them, amplify them, and radiate them as electromagnetic waves via an antenna.

[0115] In addition, the video data decoded by the video module 1005 can be received wirelessly or read from an external memory in addition to being input through the video interface 1009. For example, the projection device can receive video data from a terminal device or a car entertainment system through a wireless local area network in the vehicle. The projection device can also read audio and video data stored in an external memory.

[0116] In addition, the vehicle display system as described in FIG. 10 can be installed on a vehicle.

[0117] FIG. 11 is a vehicle provided by an embodiment of the present application, which can include various subsystems in the functional framework of the vehicle, such as the sensor system 12, the control system 14, one or more peripheral devices 16 (one is shown as an example), the power supply 18, the computer system 20, and the vehicle display system 22 shown in the figure. Optionally, the vehicle can also include other functional systems, such as an engine system for providing power for the vehicle, and the like, which are not limited herein.

[0118] The sensor system 12 can include several detection devices that can sense the information to be measured and convert the sensed information into an electrical signal or other required form of information output according to a certain rule. As shown, the detection devices can include a global positioning system (GPS), a vehicle speed sensor, an inertial measurement unit (IMU), a radar unit, a laser range finder, a camera, a wheel speed sensor, a steering sensor, a gear sensor, or other elements for automatic detection, and the like, which are not limited herein.

[0119] The control system 14 can include several elements, such as the steering unit, the braking unit, the lighting system, the automatic driving system, the map navigation system, the network time system, and the obstacle avoidance system shown in the figure. Optionally, the control system 14 can also include elements such as a throttle controller for controlling the vehicle speed and an engine controller, and the like, which are not limited herein.

[0120] The peripheral device 16 can include several elements, such as the communication system, the touch screen, the user interface, the microphone, and the speaker shown in the figure, and the like. The communication system is used to realize network communication between the vehicle and other devices other than the vehicle. In actual applications, the communication system can use wireless communication technology or wired communication technology to realize network communication between the vehicle and other devices. The wired communication technology can refer to communication between the vehicle and other devices through a network cable or optical fiber, and the like.

[0121] The power supply 18 represents a system for providing power or energy for the vehicle, which can include but is not limited to rechargeable lithium batteries or lead-acid batteries, and the like. In actual applications, one or more battery components in the power supply are used to provide electrical energy or energy for starting the vehicle, and the types and materials of the power supply are not limited herein.

[0122] A number of functions of the vehicle are controlled by the computer system 20. The computer system 20 can include one or more processors 2001 (one processor is shown as an example) and a memory 2002 (also referred to as a storage device). In actual applications, the memory 2002 can be inside the computer system 20, or outside the computer system 20, such as a cache in the vehicle, etc., which is not limited in the present application. The processor 2001 can include one or more general-purpose processors, such as a graphic processing unit (GPU). The processor 2001 can be used to run a related program or instructions corresponding to the program stored in the memory 2002 to implement the corresponding functions of the vehicle.

[0123] The memory 2002 can include a volatile memory, such as a RAM, and can also include a non-volatile memory, such as a ROM, a flash memory, a HDD, or a solid state disk SSD, and can also include a combination of the above-mentioned memories. The memory 2002 can be used to store a set of program codes or instructions corresponding to the program codes, so that the processor 2001 can call the program codes or instructions stored in the memory 2002 to implement the corresponding functions of the vehicle. In the present application, a set of program codes for vehicle control can be stored in the memory 2002, and the processor 2001 can control the vehicle to travel safely by calling the program codes. How to achieve safe driving of the vehicle is described in detail below.

[0124] Optionally, in addition to storing program codes or instructions, the memory 2002 can also store information such as road maps, driving routes, sensor data, etc. The computer system 20 can implement related functions of the vehicle in combination with other elements in the vehicle function framework diagram, such as sensors in the sensor system, GPS, etc. For example, the computer system 20 can control the driving direction or driving speed of the vehicle based on the data input of the sensor system 12, which is not limited in the present application.

[0125] The vehicle display system 22 can include a number of elements, such as a controller and a vehicle display system. The controller 222 is used to generate an image (such as an image of VR content) according to a user instruction, and send the image to the vehicle display system for display; the vehicle display system can include an image generation unit, a viewing window unit, and an image magnification unit, and passengers can view the target image presented by the vehicle display system through the viewing window unit. The functions of some elements in the vehicle display system can also be implemented by other subsystems of the vehicle, for example, the controller can also be an element in the control system.

[0126] In the application, FIG. 11 shows that the vehicle includes four subsystems, the sensor system 12, the control system 14, the computer system 20 and the vehicle display system 22, which are only examples and are not limited. In actual application, the vehicle can combine several elements in the vehicle according to different functions to obtain a corresponding subsystem with different functions. In actual application, the vehicle can include more or less systems or elements, which are not limited in the application.

[0127] The vehicle described above can be a car, a truck, a bus, a ship, an airplane, a helicopter, an entertainment vehicle, a train, etc., which are not particularly limited in the embodiments of the application.

[0128] Those skilled in the art can understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the application.

[0129] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0130] In several embodiments provided in the application, it should be understood that the disclosed system, device and method can be realized by other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0131] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place or distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiments.

[0132] In addition, each functional unit in each embodiment of the application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0133] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the present application that essentially contribute to the prior art or the parts of the technical solutions can be embodied in the form of software products. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0134] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A light source, characterized in that: It includes a laser emission unit, a fluorescence emission unit and a beam combiner, wherein: The laser emitting unit is used to emit a laser beam propagating along a first direction toward the beam combiner, wherein the laser beam is in a first polarization state; The fluorescent light emitting unit is configured to emit a fluorescent light beam propagating along a second direction toward the beam combiner, the fluorescent light beam comprising a first fluorescent light beam in the first polarization state and a second fluorescent light beam in a second polarization state, wherein the first polarization state and the second polarization state are different, and the first direction and the second direction are non-parallel; The beam combiner is used to receive the laser beam and the fluorescent beam, and perform polarization beam combining on the laser beam and the second fluorescent beam to obtain a first mixed beam.

2. The light source according to claim 1, wherein in: The wavelength ranges of the laser beam and the fluorescent beam partially or completely overlap; and / or The laser beam and the fluorescent beam partially or completely overlap in receiving areas on the beam combiner.

3. The light source according to claim 1 or 2, characterized in that The beam combiner is a dichroic mirror, wherein polarization combining of the laser beam and the fluorescent beam is performed, comprising: The dichroic mirror transmits the laser beam, and the dichroic mirror reflects the second fluorescent beam; or The dichroic mirror reflects the laser beam, and the dichroic mirror transmits the second fluorescent beam.

4. The light source according to claim 3, characterized in that in: The fluorescent light beam further includes a third fluorescent light beam in a first wavelength range and a fourth fluorescent light beam in a second wavelength range, wherein the first wavelength range overlaps with the wavelength range of the laser light beam, and the second wavelength range does not overlap with the wavelength range of the laser light beam; The dichroic mirror is further used to perform wavelength combination on the fourth fluorescent light beam and the laser light beam to obtain a second mixed light beam.

5. The light source according to claim 3, characterized in that in: The dichroic mirror includes a first area and a second area, the first area and the second area do not overlap, the fluorescent light beam further includes a fifth fluorescent light beam and a sixth fluorescent light beam, the first area is used to receive the laser light beam and the fifth fluorescent light beam, and the second area is used to receive the sixth fluorescent light beam; The dichroic mirror is further used to spatially combine the laser beam and the sixth fluorescent beam to obtain a third mixed beam.

6. The light source according to any one of claims 1 to 5, characterized in that The laser beam includes at least one of the following wavelength ranges: a red light wavelength range, a green light wavelength range, or a blue light wavelength range.

7. The light source according to claim 6, characterized in that in: The laser beam includes the following wavelength ranges: a red light wavelength range, a green light wavelength range, and a blue light wavelength range; The laser beam includes a first laser beam and a second laser beam, and wavelength ranges of the first laser beam and the second laser beam overlap.

8. The light source according to claim 6 or 7, characterized in that The laser emitting unit includes a first beam direction control element and a second beam direction control element, wherein the first beam direction control element is a dichroic mirror or a reflector, and the second beam direction control element is a dichroic mirror or a reflector, wherein: The first beam direction controlling element and the second beam direction controlling element are arranged along a third direction, and the second beam direction controlling element and the beam combiner are arranged along the first direction, wherein the first direction and the third direction are non-parallel; The first beam direction control element and the second beam direction control element are used to control the direction of a third laser beam included in the laser beams, so that the third laser beam propagates along the first direction.

9. The light source according to any one of claims 1 to 8, characterized in that in: The laser emitting unit includes a first laser, the first laser is used to generate a fourth laser beam, and the laser beam includes the fourth laser beam; The fluorescent light emitting unit includes a second laser and a fluorescent body, wherein the second laser is used to generate a fifth laser beam, and the fifth laser beam is used to excite the fluorescent body so that the fluorescent body generates the fluorescent light beam; The first laser and the second laser are the same laser.

10. A projection device, characterized in that: The method comprises a light source, a modulator and a lens according to any one of claims 1 to 9, wherein: The light source is used to emit a mixed light beam; The modulator is used to modulate the mixed light beam to obtain an optical signal; The lens is used to transmit the light signal to display a projection image.

11. A vehicle-mounted display system, characterized in that: Comprising the projection device as claimed in claim 10.

12. A means of transport, characterized in that: The vehicle-mounted display system comprises the vehicle-mounted display system as claimed in claim 11.

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