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

Abstract

The invention provides a light source, projection equipment, a vehicle-mounted display system and a vehicle, the light source comprises a laser emission unit, a fluorescence emission unit and a beam combiner, the laser emission unit is used for emitting a laser beam propagating along a first direction to the beam combiner, and the laser beam is in a first polarization state; the fluorescence emission unit is used for emitting fluorescence light beams propagating in the second direction to the beam combiner, and the fluorescence light beams comprise a first fluorescence light beam in a first polarization state and a second fluorescence light beam in a second polarization state; the beam combiner is used for receiving the laser beam and the fluorescent light beam and carrying out polarization beam combination on the laser beam and the second fluorescent light beam to obtain a first mixed light beam. A polarization light combination scheme is added into a laser and fluorescence mixed light source structure, so that a laser and fluorescence mixed scheme with low energy loss is realized.

Description

Technical Field

[0001] The present application relates to the field of projection display, and in particular to a light source, a projection device, a vehicle-mounted display system, and a vehicle. Background Art

[0002] As society fully enters the multimedia information age, information types are transitioning from simple digital text to multimedia forms dominated by images and sounds. As the main carrier of image information, display projection devices are becoming increasingly popular with the development of laser and display chip semiconductor technologies.

[0003] The light source solutions currently used in projection display systems include mercury lamps, three-color lasers, and advanced laser phosphor display (ALPD) technology. Among them, phosphor laser display avoids the speckle problem caused by the high coherence of laser light sources by mixing laser with fluorescence, and has the advantages of low cost, high brightness, wide color gamut, and no speckle. However, in the current laser-fluorescence mixing solution, spatial light combining or spectral light combining is usually used to mix laser and fluorescence. Both solutions will cause energy loss after light combining. Therefore, how to achieve a low-energy-loss laser and fluorescence mixing solution is a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The present application provides a light source, a projection device, a vehicle-mounted display system and a vehicle, which realizes a laser and fluorescence mixing solution with low energy loss by adding a polarization light combining solution to a laser and fluorescence mixed light source structure.

[0005] In the first aspect, a light source is provided, comprising a laser emitting unit, a fluorescent emitting unit, and a beam combiner, wherein: the laser emitting unit is used to emit a laser beam propagating in a first direction to the beam combiner, and the laser beam is in a first polarization state; the fluorescent emitting unit is used to emit a fluorescent beam propagating in a second direction to the beam combiner, and the fluorescent beam includes a first fluorescent beam in a first polarization state and a second fluorescent 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 polarization-combine 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 polarization-combining the laser light source with the fluorescent light source, a technical solution different from existing spectral light combining and spatial light combining is provided. In this case, since the laser light source has a polarization state, most of the laser polarization energy (for example, >96%) is retained after beam combining, while the fluorescent light source only loses part of the luminous flux or energy component with the same polarization state as the laser light source, thereby reducing the energy loss after light combining.

[0006] With reference to the first aspect, in some implementations of the first aspect, the wavelength ranges of the laser beam and the fluorescent light beam overlap; and / or the receiving areas of the laser beam and the fluorescent light beam on the combiner overlap.

[0007] With reference to the first aspect, in some implementations of the first aspect, the combiner is a dichroic mirror, and the polarized combining of the laser beam and the fluorescent light beam comprises: the dichroic mirror transmitting the laser beam and reflecting the second fluorescent light beam; or the dichroic mirror reflecting the laser beam and transmitting the second fluorescent light beam.

[0008] With reference to the first aspect, in some implementations of the first aspect, the fluorescent light beam further comprises a third fluorescent light beam of a first wavelength range and a fourth fluorescent light 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 wavelength-combine the fourth fluorescent light beam and the laser beam to obtain a second mixed light beam. In the above polarized light combining scheme, since the fluorescent light beam includes two polarization states at the same time, part of the light flux or energy component of the same polarization state as the laser light source is lost. By combining the polarized light combining and the spectral light 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, and energy loss is reduced.

[0009] With reference to the first aspect, in some implementations of the first aspect, the dichroic mirror comprises a first area and a second area, the first area and the second area do not overlap, and the fluorescent light beam further comprises a fifth fluorescent light beam and a sixth fluorescent light beam, the first area is configured to receive the laser beam and the fifth fluorescent light beam, and the second area is configured to receive the sixth fluorescent light beam; and the dichroic mirror is further configured to spatially combine the laser beam and the sixth fluorescent light beam to obtain a third mixed light beam. In the above polarized light combining scheme, since the fluorescent light beam includes two polarization states at the same time, part of the light flux or energy component of the same polarization state as the laser light source is lost. By combining the polarized light combining and the spatial light 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, and energy loss is reduced.

[0010] With reference to the first aspect, in some implementations of the first aspect, the laser beam comprises at least one of the following wavelength ranges: a red wavelength range, a green wavelength range, or a blue wavelength range.

[0011] In some implementations of the first aspect, the laser beam includes a red wavelength range, a green wavelength range, and a blue wavelength range, and the laser beam includes a first laser beam and a second laser beam, and the wavelength ranges of the first laser beam and the second laser beam overlap. Thus, a four-color laser light source is provided, which includes two laser beams with partially overlapping wavelength ranges, and the light source is further enriched in color and improved in brightness when the light source is used in a projection device. The overall volume of the laser emitting unit is reduced by folding the optical path through the two beam direction control elements, i.e., the dichroic mirror and the reflector.

[0012] In some implementations of the first aspect, the laser emitting unit includes 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, and 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, and 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 beam included in the laser beam, so that the third laser beam propagates along the first direction.

[0013] In some implementations of the first aspect, the laser emitting unit includes a first laser, the first laser is configured to generate a fourth laser beam, and the laser beam includes the fourth laser beam, and the fluorescent light emitting unit includes a second laser and a fluorescent body, the second laser is configured to generate a fifth laser beam, and the fifth laser beam is configured to excite the fluorescent body to generate a fluorescent light beam, and the first laser and the second laser are the same laser. That is, the laser emitting unit can multiplex the laser with the fluorescent light emitting unit, so as to reduce the overall energy consumption of the light source.

[0014] In some implementations of the first aspect, the laser emitting unit includes a first laser, the first laser is configured to generate a fourth laser beam, and the laser beam includes the fourth laser beam, and the fluorescent light emitting unit includes a second laser and a fluorescent body, the second laser is configured to generate a fifth laser beam, and the fifth laser beam is configured to excite the fluorescent body to generate a fluorescent light beam, and the first laser and the second laser are the same laser. That is, the laser emitting unit can multiplex the laser with the fluorescent light emitting unit, so as to reduce the overall energy consumption of the light source.

[0015] In some implementations of the first aspect, the laser emitting unit includes a first laser, the first laser is configured to generate a fourth laser beam, and the laser beam includes the fourth laser beam, and the fluorescent light emitting unit includes a second laser and a fluorescent body, the second laser is configured to generate a fifth laser beam, and the fifth laser beam is configured to excite the fluorescent body to generate a fluorescent light beam, and the first laser and the second laser are the same laser. That is, the laser emitting unit can multiplex the laser with the fluorescent light emitting unit, so as to reduce the overall energy consumption of the light source.

[0016] In some implementations of the first aspect, the laser emitting unit includes a first laser, the first laser is configured to generate a fourth laser beam, and the laser beam includes the fourth laser beam, and the fluorescent light emitting unit includes a second laser and a fluorescent body, the second laser is configured to generate a fifth laser beam, and the fifth laser beam is configured to excite the fluorescent body to generate a fluorescent light beam, and the first laser and the second laser are the same laser. That is, the laser emitting unit can multiplex the laser with the fluorescent light emitting unit, so as to reduce the overall energy consumption of the light source. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a schematic diagram of a light source according to an embodiment of the present application.

[0018] Figure 2 is a schematic diagram of a laser emitting unit provided by an embodiment of the present application.

[0019] Figure 3 is a schematic diagram of a fluorescent light emitting unit provided by an embodiment of the present application.

[0020] Figure 4 is a schematic diagram of a first light source structure provided by an embodiment of the present application.

[0021] Figure 5 is a reflection spectrum and a transmission spectrum diagram of a combiner provided by an embodiment of the present application.

[0022] Figure 6 is a schematic diagram of a second light source structure provided by an embodiment of the present application.

[0023] Figure 7 is a reflection spectrum and a transmission spectrum diagram of a combiner provided by an embodiment of the present application.

[0024] Figure 8 is a schematic diagram of a third light source structure provided by an embodiment of the present application.

[0025] Figure 9 is a schematic diagram of a projection device provided by an embodiment of the present application.

[0026] Figure 10 is a schematic diagram of a vehicle display system provided by an embodiment of the present application.

[0027] Figure 11 is a vehicle provided by an embodiment of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the present application will be described below with reference to the drawings.

[0029] Hereinafter, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features.

[0030] Reference within the specification to "one embodiment" or "an embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrase "in one embodiment" or "in some embodiments" in various places within specified

[0031] 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 in which the components in the drawings are placed. It should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and 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 in which the components in the drawings are placed, and therefore cannot be understood as a limitation on the present application.

[0032] The terms "comprise", "have" and any variations thereof in the embodiments of the present application shown below are intended to cover the inclusions that are not exclusive, 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 these processes, methods, products or devices.

[0033] In the embodiments of the present application, the words "exemplary" or "for example" are used to mean example, illustration, or description, and embodiments or designs described as "exemplary" or "for example" should not be construed as preferred or superior over other embodiments or designs. The use of "exemplary" or "for example" is intended to present the relevant concept in a specific manner for ease of understanding.

[0034] With the overall entry of society into the multimedia information age, the types of information have transitioned from single digital text to multimedia forms mainly in the form of images and sounds. As the main carrier of image information, with the development of laser and display chip semiconductor technology, display projection devices have become increasingly popular.

[0035] At present, the light source solutions used in projection display systems include mercury lamps, three-color lasers, and advanced laser phosphor display (ALPD) technology. Mercury lamp light sources were the mainstream light source in the early stages of the development of projection systems, but due to their very short lifespan, high heat generation, and low optical power density, they have gradually been replaced by other light source types. The color gamut of the red, green, and blue three-color laser solution can cover Bt.2020. The red, green, and blue channels are all pure laser light sources. Due to their high coherence characteristics, they bring about the "speckle" problem of granular matte feeling, which causes visual fatigue after long-term viewing. In order to suppress laser speckle, the solution requires cost, volume, and brightness, which is the pain point of the pure laser light source solution. In order to reduce laser speckle while maintaining a high-brightness and wide-color-gamut projection experience, some projection manufacturers have introduced a "mixed light" light source: laser mixed with phosphor.

[0036] Fluorescent laser display avoids the speckle problem caused by the high coherence of laser light sources by mixing laser with fluorescence. The color gamut coverage of the red, blue laser plus green fluorescent light source type is generally 95% DCI-P3. That is, fluorescent laser display has the advantages of low cost, high brightness, wide color gamut, and no speckle. In the current laser mixing fluorescence scheme, spatial light combination or spectral light combination is usually used to mix laser and fluorescence. However, since the fluorescent light source is usually Lambertian light and has the characteristics of a wide spectrum, because the fluorescence spectrum is wide, the laser spectrum (such as red laser and green laser) is easy to overlap with the fluorescence spectrum. Since the laser spectrum and the fluorescence / LED spectrum partially overlap, the industry mainly uses spatial light combination or spectral light combination to achieve laser and fluorescence / LED fusion. The above two schemes will cause energy loss after light combination. Therefore, how to achieve a low-energy-loss laser and fluorescence mixing scheme is a technical problem that needs to be solved urgently.

[0037] 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 realize a laser and fluorescence mixing solution with low energy loss by adding a polarization light combining solution to the laser and fluorescence mixed light source structure.

[0038] Figure 1 Schematic diagram of a light source provided in an embodiment of the present application. Figure 1 As shown, the light source includes a laser emitting unit 110 , a fluorescent light emitting unit 120 and a beam combiner 130 .

[0039] The laser emitting unit 110 is used to emit a laser beam propagating along a first direction toward the beam combiner 130 , where the laser beam is in a first polarization state.

[0040] Among them, the laser emitting unit 110 may include one or more lasers, and each laser may include one or more laser emitting chips. The laser emitting chip can be used to emit a laser beam with a wavelength range greater than or equal to 380nm and less than or equal to 740nm. In some implementations, the laser emitting chip is used to emit a laser beam of at least one wavelength range, and the laser beam of at least one wavelength range includes at least one of the following: a red light wavelength range, a green light wavelength range, and a blue light wavelength range. The emitted red light wavelength range may refer to a wavelength range greater than or equal to 615nm and less than or equal to 665nm. The green light wavelength range may refer to a wavelength range greater than or equal to 500nm and less than or equal to 560nm. The blue light wavelength range may refer to a wavelength range greater than or equal to 420nm and less than or equal to 480nm.

[0041] In some implementations, the laser emitting unit 110 further includes one or more lenses, and one or more lenses can be arranged in the laser beam propagation path of the above-mentioned laser, and the lens can be specifically used to perform functions such as collimation or focusing on the laser beam emitted by the above-mentioned laser.

[0042] In some implementations, the laser emitting unit 110 further includes one or more polarization devices such as wave plates and polarizers, which are used to change the polarization state of the laser beam so that the laser beam is incident from the beam combiner 130 in the first polarization state.

[0043] In addition, optical devices such as a laser speckle eliminator may also be provided in the laser emitting unit 110. The specific composition of the laser emitting unit 110 will be described in conjunction with the following drawings.

[0044] It should be understood that the term "propagating in a first direction" as used herein is only used to limit the direction of the laser beam when incident on the beam combiner 130, and does not limit the direction of the laser beam emitted by one or more lasers in the laser emitting unit 110. In some implementations, the laser emitting unit 110 further includes one or more reflectors and dichroic mirrors, which can be disposed in the laser emission path of the aforementioned lasers. The reflectors and dichroic mirrors can be specifically used to control the laser beam so that the laser beam enters the beam combiner 130 from the first direction.

[0045] The fluorescent emission unit 120 is used to emit a fluorescent light beam propagating along a second direction to the beam combiner 130. The fluorescent light beam includes a first fluorescent light beam in a 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 specific form of the fluorescent light emission unit 120 is explained in conjunction with the following drawings. Among them, "the fluorescent light beam includes a first fluorescent light beam in a first polarization state and a second fluorescent light beam in a second polarization state" can also be understood as "the fluorescent light beam contains a first fluorescent light beam in a first polarization state and a second fluorescent light beam in a second polarization state", or "the fluorescent light beam can be decomposed into a first fluorescent light beam with a first polarization state and a second fluorescent light beam with a second polarization state". Among them, the first polarization state can be perpendicular to the second polarization state.

[0046] It should be understood that the “propagation along the second direction” referred to in this application is only used to limit the direction of the fluorescent light beam when it is incident on the combiner 130 , and does not limit the direction of the fluorescent body in the fluorescent emission unit 120 when emitting the fluorescent light beam.

[0047] The beam combiner 130 is used 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. The specific form of the beam combiner 130 is determined according to actual conditions. The beam combiner 130 can be understood as a polarization beam splitter, a polarization 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 polarizing film. In addition, the beam combiner 130 can also be in the form of a prism, which is not limited in this application. In some implementations, the arrangement angle of the dichroic mirror is 45 degrees.

[0048] In some implementations, such as Figure 1 As shown in (a), the dichroic mirror transmits the laser beam and reflects the second fluorescent beam, thereby performing polarization beam combination on the laser beam and the second fluorescent beam.

[0049] In some implementations, such as Figure 1 As shown in (b), the dichroic mirror reflects the laser beam and transmits the second fluorescent beam, thereby performing polarization beam combination on the laser beam and the second fluorescent beam.

[0050] In such Figure 1In the light source shown, 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 this application can be understood as linearly polarized light, that is, the trajectory of the endpoint 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 and the normal at the incident point is the incident plane. If the vibration direction of the electric vector of the light is within the incident plane, it is called a P polarization state. If the vibration direction of the electric vector of the light is perpendicular to the incident plane, it is called an S polarization state.

[0051] In such Figure 1 In the light source shown, there may be a situation where the wavelength ranges of the laser light beam incident on the beam combiner and the fluorescent light beam partially or completely overlap, and / or the receiving areas of the laser light beam and the fluorescent light beam on the beam combiner partially or completely overlap. By emitting a laser light source with a polarization state and polarization combining the laser light source with the fluorescent light source, a technical solution different from the existing spectral light combining and spatial light combining is provided. In this case, since the laser light source has a polarization state, most of the laser polarization energy (for example, >96%) is retained after combining, and the fluorescent light source only loses part of the luminous flux or energy component with the same polarization state as the laser light source, thereby reducing the energy loss after combining.

[0052] In addition, in this case, the beam combiner can also be further structurally designed to further reduce the energy loss after light combination.

[0053] In some implementations, the fluorescent light beam incident on the beam combiner (dichroic mirror) further includes a third fluorescent light beam in a first wavelength range and a fourth fluorescent light beam in a second wavelength range. 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 configured to wavelength combine the fourth fluorescent light beam and the laser light beam to obtain a second mixed light beam. That is, in addition to a portion or all of the dichroic mirror being coated with a polarizing film, a portion or all of the dichroic mirror may also be coated with a filter film. The filter film is configured to transmit the fourth fluorescent light beam and reflect the laser light beam. Alternatively, the filter film is configured to reflect the fourth fluorescent light beam and transmit the laser light beam.

[0054] In the above-mentioned polarization light combining scheme, since the fluorescent light beam includes two polarization states at the same time, part of the light flux or energy component with the same polarization state as the laser light source will be lost. However, through a combination of polarization light combining and spectral light combining, for example, first coating a filter film on the dichroic mirror, the dichroic mirror can combine the laser beam and the fluorescent light beam in different wavelength ranges. The fluorescence brightness loss in the spectral light combining method is B%, and B% = the brightness of the laser band in the fluorescence spectrum P1 / the total fluorescence brightness P2. By coating a polarization film at the overlapping wavelength range on the dichroic mirror, part of the light flux or energy component in the fluorescent light source with a different polarization state from the laser light source can be further combined to reduce energy loss.

[0055] 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, and the first region 140 and the second region 150 do not overlap. The first region 140 is used to receive the laser beam and the fifth fluorescent light beam. The second region 150 is used to receive the sixth fluorescent light beam. The dichroic mirror is also used to spatially combine the laser beam and the sixth fluorescent light beam to obtain a third mixed light beam. For example, a hole may be provided in the first region 140 so that the first region 140 directly transmits the laser beam after receiving it, and the second region 150 reflects the sixth fluorescent light beam after receiving it. Figure 1 (c) specifically shows a setting position of the first area 140 and the second area 150 in the dichroic mirror. In addition, according to the specific position of the incident dichroic mirror, the first area 140 and the second area 150 can also have other setting schemes, which are determined according to actual conditions.

[0056] In the above-mentioned polarization light combining scheme, since the fluorescent light beam includes two polarization states at the same time, part of the luminous flux or energy component with the same polarization state as the laser light source will be lost. However, through the combination of polarization light combining and spatial light combining, for example, a hole is first set on the dichroic mirror, the hole is used to transmit the laser beam, and the rest of the dichroic mirror is used to reflect the fluorescent light beam. Then, since the hole will transmit the fluorescent light beam, part of the light path or energy component of the fluorescent light beam will be lost. The fluorescence loss brightness of the spatial light combining method is A%, and A% = laser spot size S1 at the light combining plate / fluorescent spot size S2 at the light combining plate. By coating the opening area with a polarization light combining film, part of the luminous flux or energy component with the same polarization state as the laser light source in the fluorescent light source in the opening area can be further combined to reduce energy loss.

[0057] In addition, if Figure 1 The light combining scheme shown can also be used to combine laser and light emitting diode light sources, and this application does not limit this.

[0058] Figure 2Schematic diagram of a laser emitting unit provided in an embodiment of the present application.

[0059] like Figure 2 As shown in (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.

[0060] like Figure 2 As shown in (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 structure 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 light and fluorescent light to create a three-color light source, capable of providing a rich color palette when used in a projection device.

[0061] like Figure 2 As shown in (c), the laser emitting unit includes a blue laser 230, a three-color laser 250, a dichroic mirror 260 and a reflector 270. The blue laser 230 and the three-color laser 250 include laser chips and Figure 2 (a) and (b) are similar and will not be described here. The blue laser is used to emit blue light with a wavelength range of λ B1 The laser beam, λ B1 The 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.

[0062] In addition, in the above Figure 2 In the embodiment of the present invention, it is also possible to limit only the laser beam emitted by the red laser emitting chip (for example, 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.

[0063] In addition, in the above Figure 2 In an embodiment, it is also possible to limit only the polarization states 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.

[0064] In addition, the laser emitting unit may be in other forms, which will not be described in detail here.

[0065] Figure 3 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 phosphor 320 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.

[0066] In some implementations, such as Figure 3 As shown in (a), laser 310 emits a laser beam toward the back of phosphor 320, stimulating it to emit a fluorescent beam. A first lens group, comprising lenses 331 and 332, can be positioned in the path of the fluorescent beam emitted by phosphor 320. This first lens group is used to collimate the fluorescent beam. Activating the fluorescent beam from the back improves its excitation efficiency.

[0067] In some implementations, such as Figure 3 As shown in (b), laser 310 emits a laser beam toward the front of phosphor 320, causing phosphor 320 to be stimulated to emit a fluorescent beam. A second lens group, comprising lenses 341 and 342, may be positioned in the path of the laser beam emitted by laser 310. The second lens group is used to focus the laser light. A third lens group, comprising lenses 351 and 352, may be positioned in the path of the fluorescent beam emitted by phosphor 320. The third lens group is used to collimate the fluorescent beam.

[0068] In addition, the fluorescent light emitting unit may also generate the fluorescent light beam in other ways, and this application does not limit this.

[0069] 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.

[0070] Figure 4 This is a schematic diagram of the first light source structure provided in the embodiment of the present application. Figure 4 As shown, the light source includes a laser emission unit, a fluorescent emission unit and a beam combiner 480.

[0071] 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 λB1 λ B1 The laser beam of λ B1 may be 455 nm. The three-color laser 420 is configured to emit a three-color laser beam, the three-color laser beam including a red wavelength range λ R , a green wavelength range λ G , and a blue wavelength range λ B2 , the three-color laser beam being in a second polarization state. λ R may be 640-650 nm, λ G may be 525 nm, λ B2 may be 465 nm.

[0072] The dichroic mirror 430 and the mirror 440 are arranged along a third direction. The mirror 440 and the beam combiner 480 are arranged along a first direction. The third direction and the first direction are non-parallel. λ B1 The laser beam of λ B1 is split by the beam splitter 450 into a first portion of the laser beam of λ B1 and a second portion of the laser beam of λ B1 The first portion of the laser beam of λ B1 is reflected by the dichroic mirror 430. Then, the first portion of the laser beam of λ B1 is reflected by the mirror 440 again. 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 a laser beam including the first portion of the laser beam of λ B1 and the three-color laser beam to the beam combiner, the laser beam being in a first polarization state.

[0073] The fluorescent emission unit includes the blue laser 410, a lens group, and the fluorescent body 470. The lens group includes a lens 461 and a lens group 462. The beam splitter 450, the beam combiner 480, and the fluorescent body 470 are arranged along a third direction. The second portion of the laser beam of λ B1After the laser beam is focused by the lens group, it enters the fluorescent body 470 to generate a fluorescent beam. The fluorescent beam can cover a wide spectrum of wavelengths from 480nm to 680nm. The fluorescent beam passes through the lens group again and is collimated. Thus, the fluorescent emission unit emits the fluorescent beam to the beam combiner, and the fluorescent beam can be decomposed into a first polarization state and a second polarization state. After the beam combiner receives the laser beam emitted by the laser emission unit, it transmits the laser beam. After receiving the fluorescent beam, the beam combiner reflects the part of the fluorescent beam in the second polarization state. Thus, the laser beam and the fluorescent beam in the second polarization state are combined into a mixed beam. In some implementations, the beam combiner can also be used to perform polarization combination and wavelength combination on the laser beam and the fluorescent beam.

[0074] For example, in the above Figure 4 In the embodiment of the present invention, it is also possible to limit only the laser beam emitted by the red laser emitting chip (for example, 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.

[0075] For example, in the above Figure 4 In an embodiment, it is also possible to limit only the polarization states 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.

[0076] Figure 5 These are the reflection spectrum and transmission spectrum of the combiner provided in the embodiments of the present application. Figure 5 and Figure 4 The specific embodiments described in the embodiment correspond to the above. The beam combiner may be a dichroic mirror, the entire surface of which is coated with a filter film, which is used to combine the wavelengths of the laser beam and the fluorescent beam. The filter film is used to transmit the laser beam, and the filter film is used to reflect the portion of the fluorescent beam that does not overlap with the wavelength of the laser beam. In addition, a portion of the dichroic mirror is coated with a polarizing film. The polarizing film is used to transmit light in a first polarization state and to reflect light in a second polarization state. The first polarization state is a P polarization state, and the second polarization state is an S polarization state.

[0077] like Figure 5The transmission spectrum of (a) is shown in the figure, where the curve R is the wavelength λ R (640nm~650nm) laser beam, curve G is λ G (525nm) laser beam, curve B-465 is λ B2 (465nm) laser beam, curve B-455 is the wavelength of λ B1 (455nm) laser beam. The transmittance of the above laser beam at the beam combiner is close to 1. Moreover, according to the P light transmission spectrum, it can be seen that the laser beam with P polarization state is completely transmitted by the dichroic mirror.

[0078] like Figure 5 As shown in the reflection spectrum in (b), the reflectivity of light with wavelengths between approximately 480 nm and 520 nm, and between 530 nm and 680 nm is close to 1. That is, among the fluorescent light beams between 480 nm and 680 nm, the fluorescent light beams with wavelengths between 520 nm and 530 nm are reflected.

[0079] Dichroic mirror transmission λ G The area where the laser beam (525nm) is located is coated with a polarizing film. Figure 5 As shown in the P-light reflection spectrum and S-light reflection spectrum in (b), the dichroic mirror transmits the P-polarized state λ G (525nm) laser beam, reflecting the S polarization state of λ G Therefore, by comparing the incident fluorescence spectrum, the outgoing fluorescence spectrum, and the integrated reflectance spectrum, it can be seen that only the P-polarized fluorescence beam in the 520nm-530nm range is lost. The loss of the fluorescence beam in the green wavelength range of 520nm-530nm is reduced by half compared to the technical solution that only performs wavelength combination.

[0080] Figure 6 Schematic diagram of the second light source structure provided in the embodiment of the present application. Figure 6 As shown, the light source includes a laser emission unit, a fluorescent emission unit and a beam combiner 680.

[0081] 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 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, λ B1 The laser beam is in the first polarization state, λ B1 The red laser 620 can be used to emit red light in the wavelength range λ R The laser beam, λ RThe laser beam is in the second polarization state, λ R The second blue laser 690 is used to emit blue light with a wavelength range of λ B2 The laser beam, λ B2 The laser beam is in the second polarization state, λ B2 It can be 465nm.

[0082] The first dichroic mirror 630 and the second dichroic mirror 640 are arranged along the third direction. The second dichroic mirror 640 and the beam combiner 680 are arranged along the first direction. The third direction is non-parallel to the first direction. B1 After the laser beam is emitted from the first blue laser 610, it is split by the spectrometer 650 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 first dichroic mirror 630. B1 The laser beam is reflected again after passing through the second dichroic mirror 640. R After the laser beam of λ is emitted from the red laser 620, it is transmitted through the first dichroic mirror 630. R The laser beam is reflected after passing through the second dichroic mirror 640. B2 After the laser beam is emitted from the second blue laser 690, it is transmitted by the second dichroic mirror 640. Thus, the laser emitting unit emits a laser beam to the beam combiner 680, and the laser beam includes the first part of the λ B1 The laser beam, λ R The laser beam and λ B2 The laser beam is in a first polarization state.

[0083] The fluorescence emission unit includes a first blue laser 610, a lens group, and a fluorescent body 670. The lens group includes a lens 661 and a lens 662. The beam splitter 650, the beam combiner 680 and the fluorescent body 670 are arranged along the third direction. B1 The laser beam passes through the dichroic mirror and is transmitted by the dichroic mirror. B1 After being focused by the lens group, the laser beam enters phosphor 670, generating 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. The fluorescent emission unit then transmits the fluorescent beam to beam combiner 680, where it can be decomposed into a first polarization state and a second polarization state.

[0084] After receiving the laser beam emitted by the laser emitting unit, the beam combiner 680 transmits the laser beam. After receiving the fluorescent beam, the beam combiner 680 reflects the portion of the fluorescent beam with the second polarization state. Thus, the laser beam and the fluorescent beam with the second polarization state are combined into a mixed beam. In some implementations, the beam combiner 680 can also be used to perform polarization and wavelength combining on the laser beam and the fluorescent beam.

[0085] For example, in the above Figure 7 In the embodiment of the present invention, it is also possible to limit only the laser beam emitted by the red laser emitting chip (for example, 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.

[0086] For example, in the above Figure 7 In an embodiment, it is also possible to limit only the polarization states 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.

[0087] Figure 7 These are the reflection spectrum and transmission spectrum of the combiner provided in the embodiments of the present application. Figure 7 and Figure 6 The specific embodiments described in the embodiment correspond to the above. The beam combiner may be a dichroic mirror, the entire surface of which is coated with a filter film, which is used to combine the wavelengths of the laser beam and the fluorescent beam. The filter film is used to transmit the laser beam, and the filter film is used to reflect the portion of the fluorescent beam that does not overlap with the wavelength of the laser beam. In addition, a portion of the dichroic mirror is coated with a polarizing film. The polarizing film is used to transmit light in a first polarization state and to reflect light in a second polarization state. The first polarization state is a P polarization state, and the second polarization state is an S polarization state.

[0088] like Figure 7 The transmission spectrum of (a) is shown in the figure, where the curve R is the wavelength λ R (640nm~650nm) laser beam, curve B-465 is λ B2 (465nm) laser beam, curve B-455 is the wavelength of λ B1(455nm) laser beam. The transmittance of the above laser beam at the beam combiner is close to 1. Moreover, according to the P light transmission spectrum, it can be seen that the laser beam with P polarization state is completely transmitted by the dichroic mirror.

[0089] like Figure 7 As shown in the reflection spectrum in (b), the reflectivity of light with a wavelength of approximately 480 nm to 630 nm is close to 1. That is, among the fluorescent light beams of 480 nm to 680 nm, the fluorescent light beams of the remaining wavelength ranges are reflected except for the fluorescent light beams of 630 nm to 680 nm.

[0090] Dichroic mirror transmission λ R The area of ​​the laser beam (640nm~650nm) is coated with a polarizing film. Figure 7 As shown in the P-light reflection spectrum and S-light reflection spectrum in (b), the dichroic mirror transmits the P-polarized state λ R (640nm~650nm) laser beam, reflecting the S polarization state λ R Therefore, by comparing the incident fluorescence spectrum, the outgoing fluorescence spectrum and the comprehensive reflection spectrum, it can be seen that only the P polarization state λ R The fluorescent light beam in the red wavelength range of 640nm to 650nm is lost, and the loss of the fluorescent light beam in the red light wavelength range of 640nm to 650nm is reduced by half compared with the technical solution of only performing wavelength combination.

[0091] Figure 8 This is a schematic diagram of the third light source structure provided in the embodiment of the present application. Figure 8 As shown, the light source includes a laser emission unit, a fluorescent emission unit and a beam combiner 880.

[0092] 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.

[0093] The dichroic mirror 830 and the first reflector 840 are arranged along the third direction, the first reflector 840 and the second reflector 890 are 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.

[0094] 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 and the beam combiner 880 are arranged along the first direction. B1 After passing through the beam combiner 880, the laser beam is reflected by the beam combiner 880. B1 After being focused by the lens assembly, the laser beam enters phosphor 870, generating 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 assembly again and is collimated. The fluorescent emission unit then transmits the fluorescent beam to the beam combiner, where it can be decomposed into a first polarization state and a second polarization state.

[0095] After receiving the laser beam emitted by the laser emitting unit, the beam combiner reflects the laser beam. After receiving the fluorescent beam, the beam combiner transmits the portion of the fluorescent beam with the second polarization state. Thus, the laser beam and the fluorescent beam with the second polarization state are combined into a mixed beam.

[0096] In addition, in the above Figure 8 In the embodiment of the present invention, it is also possible to limit only the laser beam emitted by the red laser emitting chip (for example, 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 λB1 ,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.

[0097] In addition, in the above Figure 8 In an embodiment, it is also possible to limit only the polarization states 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.

[0098] Figure 9 This is a schematic diagram of the structure of a projection device provided in an embodiment of the present application. Figure 9 As shown, the projection device includes the light source 910, modulator 920 and lens 930 shown in the above figures.

[0099] The light source 910 is used to emit a mixed light beam.

[0100] The modulator 920 is used to modulate the mixed light beam to obtain an optical signal. The modulator 920 can be a liquid crystal on silicon (LCoS) modulator 920, which is a reflective spatial light modulator 920 that has the function of changing the polarization direction of incident linearly polarized light. Alternatively, the modulator 920 can be a reflective spatial light modulator 920 that does not change the polarization direction of incident linearly polarized light, such as a micro-electro-mechanical system (MEMS) or a digital micromirror device (DMD). Furthermore, the modulator 920 can also be a transmissive spatial light modulator 920, such as a liquid crystal display (LCD).

[0101] The lens 930 is used to project light signals to display a projection image.

[0102] Figure 10 Schematic diagram of a vehicle display system provided by an embodiment of the present application. Figure 10As shown, the in-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 and its peripheral components, 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, can be connected via a bus. The host CPU 1001 can be referred to as a front-end processor.

[0103] The main processor 1001 includes one or more processing units. For example, the main processor 1001 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural network processor (NPU). Different processing units may be independent devices or integrated into one or more processors.

[0104] The main processor 1001 may 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. This memory can store instructions or data that the main processor 1001 has just used or is reusing. If the main processor 1001 needs to use the instruction or data again, it can directly call it from the memory. This avoids repeated accesses, reduces the waiting time of the main processor 1001, and thus improves system efficiency.

[0105] The projection device 1010 may be any of the projection devices provided in the above embodiments. In some embodiments, the projection device 1010 may further include multiple input / output (I / O) interfaces 1008 connected to the main processor 1001. The interfaces 1008 may 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. The I / O interface 1008 may be connected to devices such as a mouse, touchpad, keyboard, camera, speaker, microphone, etc., or may be connected to physical buttons on the projection device (such as volume buttons, brightness adjustment buttons, power buttons, etc.).

[0106] 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 implement data storage function.

[0107] The internal memory 1003 can be used to store computer executable program code, which includes instructions. The internal memory 1003 may include a program storage area and a data storage area. The program storage area may store an operating system, an application required for at least one function (such as a call function, a time setting function, etc.), etc. The data storage area may store data created during the use of the projection device (such as a phone book, world time, etc.), etc. In addition, the internal memory 1003 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash memory (UFS), etc. The main processor 1001 executes various functional applications and data processing of the projection device by running instructions stored in the internal memory 1003 and / or instructions stored in a memory provided in the main processor 1001.

[0108] The projection device can implement audio functions such as music playback and calls through the audio module 1004 and the application processor.

[0109] The audio module 1004 is used to convert digital audio information into analog audio signal output, and is also used to convert analog audio input into digital audio signals. The audio module 1004 can also be used to encode and decode audio signals, such as for playing or recording. In some embodiments, the audio module 1004 can be provided in the main processor 1001, or some functional modules of the audio module 1004 can be provided in the main processor 1001.

[0110] The video interface 1009 can receive external audio and video signals, which can specifically 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. When the projection device is used as an in-vehicle display, the video interface 1009 can receive speed signals and power signals input from peripheral devices, and can also receive external VR video signals. When the projection device is in use, the video interface 1009 can receive video signals input from an external computer or terminal device.

[0111] The video module 1005 can decode the video input from the video interface 1009, for example, by performing H.264 decoding. The video module can also encode the video captured by the projection device, for example, by performing H.264 encoding on the video captured by an external camera. Furthermore, the main processor 1001 can also decode the video input from the video interface 1009 and output the decoded image signal to the projection device 1010.

[0112] Projection device 1010 is used to display the corresponding image. In this embodiment, video interface 1009 receives an external video source signal, which video module 1005 decodes and / or digitizes before outputting one or more image signals to projection device 1010. Projection device 1010 then images the incident light source based on the input image signal and outputs image light. Furthermore, main processor 1001 may also output one or more image signals to projection device 1010.

[0113] The wireless communication module 1007 enables the projection device to communicate wirelessly with the outside world. It can provide wireless local area networks (WLAN) (such as Wireless Fidelity (Wi-Fi) networks), 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 that integrate at least one communication processing module. The wireless communication module 1007 receives electromagnetic waves via an antenna, frequency modulates and filters the electromagnetic wave signals, and sends the processed signals 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 convert them into electromagnetic waves for radiation through the antenna.

[0114] In addition, in addition to being input through the video interface 1009, the video data decoded by the video module 1005 can also be received wirelessly through the wireless communication module 1007 or read from an external memory. For example, the projection device can receive video data from a terminal device or an in-vehicle entertainment system through the wireless local area network in the car, and the projection device can also read audio and video data stored in an external memory.

[0115] In addition, if Figure 10 The in-vehicle display system described in the specification can be installed on a vehicle.

[0116] Figure 11 The vehicle is provided in an embodiment of the present application. The functional framework of the vehicle may include various subsystems, 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. Optionally, the vehicle may also include other functional systems, such as an engine system that provides power for the vehicle, etc., which are not limited in this application.

[0117] The sensor system 12 may include a plurality of detection devices that sense the information being measured and convert the sensed information into electrical signals or other required information outputs according to certain rules. As shown in the figure, these detection devices may include a global positioning system (GPS), a vehicle speed sensor, an inertial measurement unit (IMU), a radar unit, a laser rangefinder, a camera, a wheel speed sensor, a steering sensor, a gear position sensor, or other components for automatic detection, etc., and this application does not limit them.

[0118] The control system 14 may include several components, such as a steering unit, a braking unit, a lighting system, an autonomous driving system, a map navigation system, a network timing system, and an obstacle avoidance system, as shown. Optionally, the control system 14 may also include components such as a throttle controller and an engine controller for controlling vehicle speed, although this application does not limit this.

[0119] The peripheral devices 16 may include several components, such as the communication system shown in the figure, a touch screen, a user interface, a microphone, and a speaker. The communication system is used to enable network communication between the vehicle and other devices. In practical applications, the communication system may utilize wireless communication technology or wired communication technology to enable network communication between the vehicle and other devices. Wired communication technology may involve communication between the vehicle and other devices via network cables or optical fibers.

[0120] Power supply 18 represents a system that provides electrical power or energy to the vehicle, and may include, but is not limited to, rechargeable lithium batteries or lead-acid batteries. In practical applications, one or more battery components in the power supply are used to provide electrical energy or energy for starting the vehicle. The type and material of the power supply are not limited in this application.

[0121] Several functions of the vehicle are controlled and implemented by a computer system 20. The computer system 20 may include one or more processors 2001 (a single processor is shown as an example) and a memory 2002 (also referred to as a storage device). In practical applications, the memory 2002 may be internal to the computer system 20 or external to the computer system 20, for example, as a cache in the vehicle, although this application does not limit this.

[0122] in,

[0123] The processor 2001 may include one or more general-purpose processors, such as a graphics processing unit (GPU). The processor 2001 may be used to run relevant programs or instructions corresponding to the programs stored in the memory 2002 to implement corresponding functions of the vehicle.

[0124] The memory 2002 may include a volatile memory, such as RAM; the memory may also include a non-volatile memory, such as ROM, flash memory, HDD or solid-state drive SSD; the memory 2002 may also include a combination of the above types of memory. 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, the memory 2002 can store a set of program codes for vehicle control, and the processor 2001 can call the program codes to control the safe driving of the vehicle. How to achieve safe driving of the vehicle is described in detail below in this application.

[0125] Optionally, in addition to storing program code or instructions, memory 2002 may also store information such as road maps, driving routes, and sensor data. Computer system 20 may integrate with other components in the vehicle functional framework diagram, such as sensors and GPS in the sensor system, to implement relevant vehicle functions. For example, computer system 20 may control the vehicle's direction or speed based on data input from sensor system 12, although this application does not limit this.

[0126] The in-vehicle display system 22 may include several components, such as a controller and an in-vehicle display system. The controller 222 is used to generate an image (e.g., an image of VR content) based on user instructions and send the image to the in-vehicle display system for display. The in-vehicle display system may include an image generation unit, a window unit, and an image magnification unit, through which passengers can view the target image presented by the in-vehicle display system. The functions of some components in the in-vehicle display system may also be implemented by other subsystems of the vehicle. For example, the controller may also be a component of the control system.

[0127] Among them, this application Figure 11 The four subsystems shown, sensor system 12, control system 14, computer system 20, and onboard display system 22, are merely illustrative and not limiting. In practice, a vehicle may combine several components according to different functions to create subsystems with corresponding functions. In practice, a vehicle may include more or fewer systems or components, and this application does not limit this.

[0128] The above-mentioned means of transportation can be a car, a truck, a bus, a ship, an airplane, a helicopter, an RV, a train, etc., and the embodiments of the present application do not make any special limitations.

[0129] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0130] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0131] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0132] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0133] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0134] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling 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 method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0135] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection 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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