Light source, projection system, projection method, and related apparatus

Abstract

A light source, projection system, projection method, and related apparatus are provided to effectively implement speckle suppression and reduce speckle contrast. The light source comprises a first blue light source (101) configured to emit a first blue laser beam (111), a second blue light source (102) configured to emit a second blue laser beam (112), a beam splitting module (103), and a phosphor (104). The beam splitting module (103) splits the second blue laser beam (112) to obtain a first sub-laser beam (113) and a second sub-laser beam (114). The wavelength and polarization of the first sub-laser beam (113) differ from those of the first blue light source (101) to suppress speckle of the blue laser beam. The second sub-laser beam (114) is used to excite the phosphor (104) to obtain fluorescence (115). The projection system performs projection imaging based on a first sub-laser beam (113), a first blue laser beam (111), and fluorescence (115).

Description

Technical Field

[0001] This application claims priority to Chinese Patent Application No. CN202310647208.1, filed with the China National Intellectual Property Administration on May 31, 2023, titled "Light Source, Projection System, Projection Method and Related Devices", the entire content of which is incorporated herein by reference.

[0002] This application relates to the field of optical communication technology, and particularly relates to light sources, projection systems, projection methods and related devices.

Background Art

[0003] With society fully entering the era of multimedia information, the types of information are shifting from single digital text to a multimedia form mainly including images and sounds. Projection systems can implement the display of multimedia forms.

[0004] The light source of the projection system can be laser light. Laser light is characterized by low energy consumption, small size, long service life, and environmental protection. The projection system includes a blue laser source, a red laser source, a green laser source, an excitation light source, a phosphor mechanism, and a synthesis mechanism. The excitation light emitted by the excitation light source excites the phosphor mechanism to obtain fluorescence. The synthesis mechanism synthesizes the blue laser light from the blue laser source, the green laser light from the green laser source, the red laser light from the red laser source, and the fluorescence from the phosphor mechanism to obtain composite light. The composite light is used as the light source of the projection system. The composite light can suppress image noise caused by laser speckle.

[0005] The wavelength of the excitation light emitted by the excitation light source is shorter than the wavelength of the fluorescence. Therefore, when the fluorescence is blue fluorescence, the excitation light is ultraviolet light. The ultraviolet light excites the phosphor mechanism to generate blue fluorescence. Since the blue fluorescence does not cause interference, it suppresses the speckle of the blue laser light. However, the excitation color gamut of the phosphor mechanism excited by ultraviolet light is narrow, and ultraviolet light can cause damage to the human eye.

Summary of the Invention

[0006] Embodiments of the present invention provide a light source, projection system, projection method, and related apparatus that effectively implement speckle suppression and reduce speckle contrast.

[0007] A first aspect of the embodiments of the present invention provides a light source. A first blue light source is configured to output a first blue laser beam. A second blue light source is configured to transmit a second blue laser beam to a beam splitting module. The wavelength of the first blue laser beam is different from that of the second blue laser beam, and the polarization of the first blue laser beam is different from that of the second blue laser beam. The beam splitting module is configured to split the second blue laser beam to obtain a first sub-laser beam and a second sub-laser beam, output the first sub-laser beam, and transmit the second sub-laser beam to a phosphor. The phosphor is configured to acquire fluorescence under excitation of the second sub-laser beam and to output fluorescence. The light source is configured to output a projection light beam. The projection light beam includes the first blue laser beam, the first sub-laser beam, and fluorescence. Examples of cases where the polarization of the first blue laser beam differs from that of the second blue laser beam are as follows: both the first and second blue laser beams are linearly polarized with different polarizations; or the first and second blue laser beams are two of the following: linearly polarized, left-handed circularly polarized, right-handed circularly polarized, or elliptically polarized. The light source is configured to transmit the projection beam to the imaging engine, and the imaging engine is configured to image the projection beam.

[0008] According to the light source shown in this embodiment, the polarization of the first blue laser light is different from that of the second blue laser light, and the wavelength of the first blue laser light is different from that of the second blue laser light. Therefore, no interference occurs between the first blue laser light and the first sub-laser light. This effectively reduces interference between the first blue laser light and the first sub-laser light, reduces speckle contrast, and effectively implements speckle suppression.

[0009] Based on the first embodiment, in an optional implementation, the light source includes blue laser light of an N beam with different wavelengths and different polarizations, where N is any integer greater than or equal to 2. The speckle contrast is negatively correlated with the value of N. In other words, a larger value of N indicates lower speckle contrast; a smaller value of N indicates higher speckle contrast.

[0010] In an optional implementation based on the first embodiment, the light source further includes a controller. The controller is connected separately to the first blue light source and the second blue light source, and the controller is configured to transmit the first light emission signal to the first blue light source and the second light emission signal to the second blue light source. The first and second light emission signals are used together to adjust the value relationship between the optical power of the first blue laser light and the optical power of the second blue laser light, and the value relationship between the optical power of the first and second blue laser light is related to the chromaticity coordinates of the projected light beam.

[0011] In this implementation, the chromaticity coordinates of the projected light beam change due to the different value relationships between the optical power of the first blue laser beam and the optical power of the first sub-laser beam. Therefore, the chromaticity coordinates of the projected light beam are adjusted to match the color gamut size and color temperature of the projected light beam.

[0012] In an optional implementation based on the first embodiment, the controller is configured to receive an adjustment command and transmit a first light emission signal to a first blue light source and a second light emission signal to a second blue light source in accordance with the adjustment command.

[0013] In this implementation, adjustment commands are input to the controller in accordance with the different environments in which the light source is located or the different requirements of the user using the light source. As a result, the chromaticity coordinates of the projected light beam can be dynamically matched to the different environments in which the light source is located or the different requirements of the user using the light source.

[0014] In an optional implementation based on the first embodiment, the polarization of the first blue laser light is perpendicular to the polarization of the second blue laser light.

[0015] In this implementation, the optimal blue laser speckle suppression effect can be achieved when the polarization of the first blue laser light is perpendicular to the polarization of the second blue laser light.

[0016] In an optional implementation based on the first embodiment, the light source further includes a polarizing beam combiner module. In a process in which a first blue light source is configured to output a first blue laser beam and a beam splitting module is configured to output a first sub-laser beam, the first blue light source is configured to transmit the first blue laser beam to the polarizing beam combiner module, and the beam splitting module is configured to transmit the first sub-laser beam to the polarizing beam combiner module. The polarizing beam combiner module is configured to output the first blue laser beam and the first sub-laser beam, respectively, based on the polarization of the first blue laser beam and the polarization of the first sub-laser beam.

[0017] The wavelengths of both the first blue laser beam and the first sub-laser beam are in the blue band. If the polarizing beam combiner module cannot accurately distinguish the first blue laser beam from the first sub-laser beam based on wavelength, it cannot be reliably transmitted both the first blue laser beam and the first sub-laser beam to the imaging engine. In this implementation, the polarizing beam combiner module transmits the first blue laser beam to the imaging engine based on the polarization of the first blue laser beam. The polarizing beam combiner module further transmits the first sub-laser beam to the imaging engine based on the polarization of the first sub-laser beam, effectively ensuring that both the first blue laser beam and the first sub-laser beam are transmitted to the imaging engine in the correct manner.

[0018] Based on the first embodiment, in an optional implementation, the polarized beam combiner module is configured to transmit and output the first blue laser light based on the polarization of the first blue laser light, and the polarized beam combiner module is configured to reflect and output the first sub-laser light based on the polarization of the first sub-laser light.

[0019] In this implementation, the polarized beam combiner module transmits the first blue laser light to the imaging engine and reflects the first sub-laser light back to the imaging engine, effectively ensuring that the first blue laser light and the first sub-laser light are transmitted to the imaging engine in the correct manner.

[0020] Based on the first embodiment, in an optional implementation, the polarized beam combiner module is configured to reflect and output the first blue laser light based on the polarization of the first blue laser light, and the polarized beam combiner module is configured to transmit and output the first sub-laser light transparently based on the polarization of the first sub-laser light.

[0021] In this implementation, the polarized beam combiner module reflects the first blue laser beam to the imaging engine and transmits the first sub-laser beam to the imaging engine transparently, effectively ensuring that the first blue laser beam and the first sub-laser beam are transmitted to the imaging engine correctly.

[0022] Based on the first embodiment, in an optional implementation, a process is configured in which a phosphor acquires fluorescence under excitation of a second sub-laser beam, wherein the phosphor is configured to acquire at least one of yellow fluorescence, red fluorescence, and green fluorescence under excitation of the second sub-laser beam. For example, the phosphor comprises yellow phosphor powder. The yellow phosphor powder is excited by the second sub-laser beam to produce yellow fluorescence. The yellow fluorescence is filtered by an optical filter or similar to produce green and red fluorescence. In another example, the phosphor is a fluorescent material system, which is a mixture of red phosphor powder and green phosphor powder. In this case, the red phosphor powder is excited by the second sub-laser beam to acquire red fluorescence, and the green phosphor powder is excited by the second sub-laser beam to acquire green fluorescence. In yet another example, the phosphor comprises two distinct regions: a red region and a green region. The red region is formed by red phosphor powder, and the green region is formed by green phosphor powder. The red region is excited by the second sub-laser beam to produce red fluorescence. The green region is excited by the second sub-laser beam to produce green fluorescence.

[0023] In this implementation, the fluorescence generated by the phosphor effectively suppresses speckle and reduces speckle contrast.

[0024] In an optional implementation based on the first embodiment, the light source further includes a red light source, the red light source is configured to output red laser light, and the projection light beam further includes red laser light.

[0025] In this implementation, the red projection beam included in the projection beam is red laser light. This effectively improves the color gamut of the projection beam.

[0026] In an optional implementation based on the first embodiment, the light source further includes a red light source and a green light source, the red light source is configured to output red laser light, the green light source is configured to output green laser light, and the projection light beam further includes green laser light and red laser light.

[0027] In this implementation, the red projection light beam and the green projection light beam included in the projection light beam are respectively red laser light and green laser light. Thereby, the color gamut of the projection light beam is effectively improved.

[0028] Based on the first aspect, in an optional implementation, the light source further includes a beam combiner module, and the beam combiner module is configured to obtain a projection light beam by combining the first blue laser light, the first sub-laser light, and fluorescence.

[0029] In this implementation, the blue projection light beam in the projection light beam includes the first blue laser light and the first sub-laser light. Since the wavelengths of the first blue laser light and the first sub-laser light are different from each other, and the polarizations of the first blue laser light and the first sub-laser light are different from each other, the speckle contrast of the blue laser light is effectively reduced. The light source can be used in a three-chip imaging engine and a single-chip imaging engine. The three-chip imaging engine includes three different modulation modules. The single-chip imaging engine is an imaging engine that includes only one modulation module.

[0030] Based on the first aspect, in an optional implementation, the light source further includes a color filter wheel, and the color filter wheel is configured to filter the blue projection light beam, the red projection light beam, and the green projection light beam from the projection light beam in different periods, and the blue projection light beam includes the first blue laser light and the first sub-laser light.

[0031] In this implementation, the light source can be used in a single-chip imaging engine.

[0032] A second aspect of the present invention provides a projection system. The projection system includes a light source and an imaging engine, the imaging engine including a modulation module and a lens assembly, and the light source as described in any implementation of the first aspect. The modulation module is configured to receive a projection light beam from the light source. The modulation module is configured to modulate the projection light beam to obtain a modulated light beam and to transmit the modulated light beam to the lens assembly. The lens assembly is configured to image the modulated light beam.

[0033] For an explanation of the beneficial effects of this embodiment, please refer to the explanation in the first embodiment. Further details will not be explained again.

[0034] In an optional implementation based on the second embodiment, the imaging engine further includes a color filter module and a focusing module. The modulation module includes a blue image modulation module, a red image modulation module, and a green image modulation module. The color filter module is configured to: split the projection light beam to obtain a blue projection light beam, a red projection light beam, and a green projection light beam; transmit the blue projection light beam to the blue image modulation module; transmit the red projection light beam to the red image modulation module; and transmit the green projection light beam to the green image modulation module. The blue image modulation module is configured to modulate the blue projection light beam to obtain a modulated blue light beam, the red image modulation module is configured to modulate the red projection light beam to obtain a modulated red light beam, and the green image modulation module is configured to modulate the green projection light beam to obtain a modulated green light beam. The focusing module is configured to: focus the modulated blue light beam, the modulated red light beam, and the modulated green light beam to obtain a modulated light beam, and transmit the modulated light beam to the lens assembly.

[0035] The blue projection beam in the projection beam includes the first blue laser light and the first sub-laser light shown in the first embodiment. The red projection beam in the light source is at least one of red laser light or red fluorescence. The green projection beam in the light source is at least one of green laser light or green fluorescence.

[0036] In an optional implementation based on the second aspect, the imaging engine further includes a color filter wheel. The color filter wheel is configured to: split the projection beam in a first period to obtain a blue projection beam and transmit the blue projection beam to a modulation module; split the projection beam in a second period to obtain a red projection beam and transmit the red projection beam to a modulation module; and split the projection beam in a third period to obtain a green projection beam and transmit the green projection beam to a modulation module, wherein any two of the first, second, and third periods are different.

[0037] A third aspect of the embodiments of the present invention provides a projection light beam transmission method. The method is applied to a light source. The light source includes a first blue light source, a second blue light source, a beam splitting module, and a phosphor. The method comprises: a step in which the first blue light source outputs a first blue laser light. The second blue light source transmits the second blue laser light to the beam splitting module. The wavelength of the first blue laser light is different from that of the second blue laser light, and the polarization of the first blue laser light is different from that of the second blue laser light. The beam splitting module splits the second blue laser light to obtain a first sub-laser light and a second sub-laser light, and transmits the first sub-laser light to a modulation module and the second sub-laser light to a phosphor. The phosphor transmits fluorescence to the modulation module. Fluorescence is acquired by the phosphor under excitation of the second sub-laser light. The modulation module modulates the projection light beam to obtain a modulated light beam and transmits the modulated light beam to a lens assembly. The projection light beam includes the first blue laser light, the first sub-laser light, and fluorescence. The lens assembly images the modulated light beam.

[0038] For an explanation of the beneficial effects of this embodiment, please refer to the explanation in the first embodiment. Further details will not be explained again.

[0039] Based on the third embodiment, in an optional implementation, the light source further includes a controller, and before the first blue light source transmits the first blue laser light to the modulation module and the second blue light source transmits the second blue laser light to the beam splitting module, the method further includes the step of the controller transmitting a first light emission signal to the first blue light source and a second light emission signal to the second blue light source. The first light emission signal and the second light emission signal are used together to adjust the value relationship between the optical power of the first blue laser light and the optical power of the second blue laser light, and the value relationship between the optical power of the first blue laser light and the optical power of the second blue laser light is related to the chromaticity coordinates of the projected light beam.

[0040] Based on the third embodiment, in an optional implementation, the controller transmitting a first light emission signal to a first blue light source and the controller transmitting a second light emission signal to a second blue light source includes: the controller receiving an adjustment command and transmitting the first light emission signal to the first blue light source and the second light emission signal to the second blue light source in accordance with the adjustment command.

[0041] Based on the third embodiment, in an optional implementation, the light source further includes a polarizing beam combiner module, wherein the first blue light source transmits the first blue laser light to a modulation module and the beam splitting module transmits the first sub-laser light to the modulation module, which includes: the first blue light source transmitting the first blue laser light to the polarizing beam combiner module; the beam splitting module transmitting the first sub-laser light to the polarizing beam combiner module; and the polarizing beam combiner module separately transmitting the first blue laser light and the first sub-laser light to the modulation module based on the polarization of the first blue laser light and the polarization of the first sub-laser light.

[0042] In an optional implementation based on the third embodiment, the polarization of the first blue laser light is perpendicular to the polarization of the second blue laser light.

[0043] Based on the third embodiment, in an optional implementation, the polarizing beam combiner module is configured to transmit and output the first blue laser light based on the polarization of the first blue laser light, and the polarizing beam combiner module is configured to reflect and output the first sub-laser light based on the polarization of the first sub-laser light. Alternatively, the polarizing beam combiner module is configured to reflect and output the first blue laser light based on the polarization of the first blue laser light, and the polarizing beam combiner module is configured to transmit and output the first sub-laser light based on the polarization of the first sub-laser light.

[0044] In an optional implementation based on the third embodiment, the light source further includes a red light source, the red light source emits red laser light, and the projected light beam further includes red laser light.

[0045] In an optional implementation based on the third embodiment, the light source further includes a red light source and a green light source, the red light source emits red laser light, the green light source emits green laser light, and the projected light beam further includes green laser light and red laser light.

[0046] In an optional implementation based on the third embodiment, the light source further includes a beam combiner module, which combines a first blue laser beam, a first sub-laser beam, and fluorescence to acquire a projected light beam.

[0047] In an optional implementation based on the third embodiment, the light source further includes a color filter wheel, which filters a blue projection light beam, a red laser light, and a green laser light from the projection light beam over different periods, wherein the blue projection light beam includes a first blue laser light and a first sub-laser light.

[0048] In an optional implementation based on the third embodiment, the light source further includes a color filter wheel, which filters a blue projection beam, a red projection beam, and a green projection beam from the projection beam to the imaging engine over different periods, wherein the blue projection beam includes a first blue laser beam and a first sub-laser beam. The red projection beam is at least one of red laser light or red fluorescence. The green projection beam is at least one of green laser light or green fluorescence.

[0049] A fourth aspect of the embodiments of the present invention provides a projection method. The method is applied to a projection system, which comprises a light source and an imaging engine, the light source comprising a first blue light source, a second blue light source, a beam splitting module, and a phosphor, the imaging engine comprising a modulation module and a lens assembly, and the method comprises: a step in which the first blue light source transmits a first blue laser beam to the imaging engine. The second blue light source transmits a second blue laser beam to the beam splitting module. The wavelength of the first blue laser beam is different from that of the second blue laser beam, and the polarization of the first blue laser beam is different from that of the second blue laser beam. The beam splitting module splits the second blue laser beam to obtain a first sub-laser beam and a second sub-laser beam, and transmits the first sub-laser beam to the imaging engine and the second sub-laser beam to the phosphor. The phosphor acquires fluorescence under excitation of the second sub-laser beam, and the phosphor transmits the fluorescence to the imaging engine. The modulation module receives the projection light beam, which comprises the first blue laser beam, the first sub-laser beam, and fluorescence. The modulation module modulates the projected light beam, acquires the modulated light beam, and transmits the modulated light beam to the lens assembly. The lens assembly then images the modulated light beam.

[0050] For an explanation of the beneficial effects of this embodiment, please refer to the explanation in the first embodiment. Further details will not be explained again.

[0051] In an optional implementation based on the fourth aspect, the imaging engine further includes a color filter module and a convergence module. The modulation module includes a blue image modulation module, a red image modulation module, and a green image modulation module.

[0052] The color filter module splits the projected light beam to obtain a blue projected light beam, a red projected light beam, and a green projected light beam.

[0053] The color filter module transmits the blue projection light beam to the blue image modulation module.

[0054] The color filter module transmits the red projection light beam to the red image modulation module.

[0055] The color filter module transmits the green projection light beam to the green image modulation module.

[0056] The modulation module modulating the projected light beam to obtain a modulated light beam includes the following:

[0057] The blue image modulation module modulates a blue projected light beam to acquire a modulated blue light beam.

[0058] The red image modulation module modulates a red projected light beam to acquire a modulated red light beam.

[0059] The green image modulation module modulates a green projection light beam to acquire a modulated green light beam.

[0060] The method further includes the steps of: a focusing module focusing the modulated blue light beam, modulated red light beam, and modulated green light beam to obtain a modulated light beam, and transmitting the modulated light beam to a lens assembly.

[0061] In an optional implementation based on the fourth aspect, the imaging engine further includes a color filter wheel. The color filter wheel splits the projection beam in the first period to obtain a blue projection beam and transmits the blue projection beam to the modulation module. The color filter wheel splits the projection beam in the second period to obtain a red projection beam and transmits the red projection beam to the modulation module. The color filter wheel splits the projection beam in the third period to obtain a green projection beam and transmits the green projection beam to the modulation module. Any two of the first, second, and third periods are different.

[0062] A fifth embodiment of the present invention provides a head-up display system comprising an optical deflection module and a projection system, in any implementation of the second embodiment. The projection system is configured to transmit a modulated light beam to the optical deflection module. The optical deflection module is configured to transmit the amplified modulated light beam to the windshield, which forms a virtual image through the windshield.

[0063] For an explanation of the beneficial effects of this embodiment, please refer to the explanation in the first embodiment. Further details will not be explained again.

[0064] A sixth embodiment of the present invention provides a vehicle comprising a body, a windshield, and a processor. The body is configured to fix the windshield and the processor. The vehicle further comprises a head-up display system according to the fifth embodiment. The processor is configured to transmit vehicle driving-related information to an imaging engine. The imaging engine is configured to modulate the vehicle driving-related information into a projection light beam and obtain a modulated light beam. The vehicle driving-related information includes advanced driver assistance system information of the vehicle, vehicle fuel consumption, engine speed, temperature, vehicle speed information, steering wheel angle information, vehicle attitude data, or the like.

[0065] A seventh aspect of the embodiments of the present invention provides a projection headlight comprising an imaging engine and a light source, in any implementation of the first aspect. The light source is configured to transmit a projection light beam to the imaging engine. The imaging engine is configured to modulate the projection light beam to obtain a modulated light beam. The modulated light beam is irradiated onto the road surface to form a target light pattern, which indicates vehicle driving-related information.

[0066] An eighth aspect of the embodiments of the present invention provides a vehicle comprising a body, a windshield, and a processor. The body is configured to fix the windshield and the processor. The vehicle further comprises projection headlights according to the seventh aspect. The processor is configured to transmit vehicle driving-related information to an imaging engine. The imaging engine is configured to modulate the vehicle driving-related information into a projection light beam and to obtain a modulated light beam.

[0067] A ninth aspect of the embodiments of the present application provides augmented reality (AR) glasses. The AR glasses comprise a frame, lenses, a modulation module, and a light source according to any one of claims 1 to 10. The frame is configured to hold the lenses, light source, and modulation module in place. The light source is configured to transmit a projected light beam to the modulation module. The modulation module is configured to modulate the projected light beam to obtain a modulated light beam and transmit the modulated light beam to the lens. The lens is configured to project the modulated light beam. [Brief explanation of the drawing]

[0068] [Figure 1] This is a diagram illustrating the structure of the first embodiment of the light source according to the present application.

[0069] [Figure 2] This figure illustrates the first spectral distribution of the projected light beam according to the present invention.

[0070] [Figure 3] This is an illustrative diagram of the first chromaticity coordinate of the projected light beam according to the present invention.

[0071] [Figure 4] This is a diagram illustrating the structure of a second embodiment of the light source according to the present application.

[0072] [Figure 5] This is an illustrative diagram of the second spectral distribution of the projected light beam according to the present invention.

[0073] [Figure 6] This is an illustrative diagram of the second chromaticity coordinate of the projected light beam according to the present invention.

[0074] [Figure 7] This is a diagram illustrating the structure of a third embodiment of the light source according to the present application.

[0075] [Figure 8] This is an illustrative diagram of the third spectral distribution of the projected light beam according to the present invention.

[0076] [Figure 9] This is a diagram illustrating the structure of a first embodiment of the projection system according to the present application.

[0077] [Figure 10] This is a diagram illustrating the structure of a fourth embodiment of the light source according to the present application.

[0078] [Figure 11] This is a diagram illustrating the structure of a second embodiment of the projection system according to the present application.

[0079] [Figure 12] This is a diagram illustrating the structure of a second embodiment of the projection system according to the present application.

[0080] [Figure 13] This is a diagram illustrating the structure of an embodiment of the head-up display system according to the present application.

[0081] [Figure 14]This is an illustrative diagram of the structure of an embodiment of the projection headlight according to the present application.

[0082] [Figure 15] This is a flowchart of the steps of the first embodiment of the projection light beam transmission method according to the present invention.

[0083] [Figure 16A] This is a flowchart of the steps of the second embodiment of the projection light beam transmission method according to the present invention. [Figure 16B] This is a flowchart of the steps of the second embodiment of the projection light beam transmission method according to the present invention.

[0084] [Figure 17] This is a flowchart of the steps of the third embodiment of the projection light beam transmission method according to the present invention.

[0085] [Figure 18] This is a flowchart of the steps of the fourth embodiment of the projection light beam transmission method according to the present invention.

[0086] [Figure 19A] This is a flowchart of the steps of the first embodiment of the projection method according to the present invention. [Figure 19B] This is a flowchart of the steps of the first embodiment of the projection method according to the present invention.

[0087] [Figure 20] This is a functional block diagram of a vehicle embodiment according to the present invention. [Modes for carrying out the invention]

[0088] Hereinafter, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings. It will be clear that the embodiments described are merely a part of, and not all, of, the embodiments of the present application. All other embodiments that can be obtained by those skilled in the art without creative effort based on the embodiments of the present application are included within the scope of the protection of the present application.

[0089] Embodiments of the present invention provide a projection system comprising a light source and an imaging engine. The light source transmits a projection light beam to the imaging engine, which modulates the projection light beam to output a modulated light beam. The modulated light beam emitted by the projection system can be imaged, and the human eye can see the image formed by the modulated light beam emitted by the projection system. The light source shown in this embodiment implements speckle suppression and can reduce speckle contrast. The projection system in this embodiment can be used in portable display devices, home theaters, conference presentations, movie projection, outdoor displays, and the like. This is not specifically limited.

[0090] Figure 1 is an illustrative diagram of the structure of a first embodiment of the light source according to the present application. The light source in this embodiment includes a first blue light source 101, a second blue light source 102, a beam splitting module 103, and a phosphor 104.

[0091] The first blue light source 101 emits one or more beams of first blue laser light 111. Specifically, the first blue light source 101 may be a single laser or a laser array. A laser array includes multiple lasers arranged in an array. The lasers may be laser diodes (LDs), vertical cavity surface-emitting lasers (VCSELs), Fabry-Perot lasers, or similar. The number of lasers included in the first blue light source 101, the types of lasers, and the arrangement of the lasers are not limited by the embodiment. The number of lasers included in the first blue light source 101 is positively correlated with the optical power and brightness of the projected light beam output by the light source. In this embodiment, an example is used in which the first blue light source 101 emits one beam of first blue laser light 111. The number of beams of first blue laser light 111 emitted by the first blue light source 101 is not limited by the embodiment. The second blue light source 102 emits one or more beams of second blue laser light 112. The number of beams of the second blue laser light 112 emitted by the second blue light source 102 is not limited in this embodiment. For a description of the second blue light source 102 in this embodiment, please refer to the description of the first blue light source 101. Further details will not be described again. In this embodiment, we use an example in which the first blue light source 101 and the second blue light source 102 are two laser sources located at different positions. This is not limited. In another example, the first blue light source 101 and the second blue light source 102 may be different lasers included in the same laser array.

[0092] To implement speckle suppression of blue laser light, the first blue laser beam 111 and the second blue laser beam 112 satisfy two conditions. Condition 1 is that the wavelength of the first blue laser beam 111 is different from the wavelength of the second blue laser beam 112. Condition 2 is that the polarization of the first blue laser beam 111 is different from the polarization of the second blue laser beam 112. Specifically, blue laser light is laser light with a wavelength in the range of 400 nanometers (nm) to 480 nm. In this embodiment, the wavelengths of the first blue laser beam 111 and the second blue laser beam 112 can be understood as any two different wavelengths in the range of 400 nm to 480 nm. In this embodiment, an example is used in which the wavelength of the first blue laser beam 111 is 465 nm and the wavelength of the second blue laser beam 112 is 455 nm. For example, both the first blue laser beam 111 and the second blue laser beam 112 are linearly polarized, and the polarization of the first blue laser beam 111 is perpendicular to the polarization of the second blue laser beam 112. Specifically, the first blue laser beam 111 is P-polarized, and the second blue laser beam 112 is S-polarized. The electric vector of the first blue laser beam 111 is parallel to the first incident plane, which is the plane where the normals of the first blue laser beam 111 and the light-emitting surface of the first blue light source 101 are located. The electric vector of the second blue laser beam 112 is perpendicular to the second incident plane, which is the plane where the normals of the second blue laser beam 112 and the light-emitting surface of the second blue light source 102 are located. In another example, the first blue laser beam 111 and the second blue laser beam 112 are two of the following: linearly polarized, left-handed circularly polarized, right-handed circularly polarized, or elliptically polarized. The description of the first blue laser beam 111 and the second blue laser beam 112 in this embodiment is an example of optional selection and is not limited as long as the polarization of the first blue laser beam 111 is different from the polarization of the second blue laser beam 112 and the wavelength of the first blue laser beam 111 is different from the wavelength of the second blue laser beam 112. It should be noted that in this embodiment, the first blue light source 101 and the second blue light source 102 are adjusted to ensure that the polarization of the first blue laser beam 111 is different from the polarization of the second blue laser beam 112.In another example, a polarization processing module configured to change the polarization may be positioned on the optical path from which the first blue laser beam 111 and / or the second blue laser beam 112 are emitted, ensuring that the polarization of the first blue laser beam 111 is different from that of the second blue laser beam 112. The polarization processing module may be a polarization converter, polarizer, polarization beam splitter, waveplate, or the like. This is not specifically limited.

[0093] The beam splitting module 103 is located on the transmission optical path of the second blue laser beam 112 emitted from the second blue light source 102. In this case, the second blue laser beam 112 emitted from the second blue light source 102 is transmitted to the beam splitting module 103. The beam splitting module 103 splits the second blue laser beam 112 to obtain a first sub-laser beam 113 and a second sub-laser beam 114. The beam splitting module 103 may be a beam splitter, a beam splitting plate, a beam splitting prism, a beam splitting film, or similar. The specific type is not limited. In this embodiment, an example in which the beam splitting module 103 is a beam splitting plate is used for illustrative purposes. The beam splitting module 103 splits the second blue laser beam 112 based on optical power. For example, the beam splitting module 103 splits the second blue laser beam 112 into a first sub-laser beam 113 and a second sub-laser beam 114 based on a preset splitting ratio. The splitting ratio may be 20%:80%. Specifically, the beam splitting module 103 uses 20% of the optical power of the second blue laser beam 112 as the first sub-laser beam 113, which is transmitted transmissively from the beam splitting module 103. The beam splitting module 103 uses 80% of the optical power of the second blue laser beam 112 as the second sub-laser beam 114, which is reflected from the beam splitting module. It can be understood that the beam splitting of the beam splitting module 103 does not change the wavelength and polarization of the laser beam. In this case, the wavelength and polarization of the first sub-laser beam 113 and the second sub-laser beam 114 are identical to those of the second blue laser beam 112. The splitting ratio is not limited to the embodiment. For example, a higher brightness of the blue light contained in the projected light beam emitted by the projection system indicates a higher proportion of the first sub-laser beam 113 in the second blue laser beam 112.

[0094] The second sub-laser beam 114 reflected from the beam splitting module 103 is transmitted to the phosphor 104. Optionally, a beam combiner module 105 is placed between the phosphor 104 and the beam splitting module 103. The beam combiner module 105 may be a color-separating mirror, a dichroic mirror, a dichroic reflector, a prism, or similar. The specific type of beam combiner module 105 is not limited to the embodiment. The beam combiner module 105 can be understood as being located in the transmission optical path of the second sub-laser beam 114 reflected from the beam splitting module 103. The second sub-laser beam 114 is transmitted transmissively from the beam combiner module 105 to the phosphor 104. The phosphor 104 can be understood as being located in the transmission optical path of the second sub-laser beam 114 transmitted transmissively from the beam combiner module 105.

[0095] To enable the projection system to project a color image, the projection light beam emitted by the light source includes a red projection light beam, a green projection light beam, and a blue projection light beam. The phosphor 104 acquires fluorescence under excitation of the second sub-laser light 114. The fluorescence includes red fluorescence used as the red projection light beam and green fluorescence used as the green projection light beam. Optionally, a lens group 106 is included between the phosphor 104 and the beam combiner module 105. The lens group 106 includes one or more lenses. The number of lenses included in the lens group 106 is not limited by the embodiment. The lens group 106 focuses the second sub-laser light 114 onto the surface of the phosphor 104. The phosphor 104 includes a fluorescent surface and a reflective surface. The fluorescent surface faces the lens group 106, and as a result, the second sub-laser light 114 emitted from the lens group 106 is focused onto the fluorescent surface. The fluorescent surface is formed of yellow phosphor powder. The phosphor screen is excited by the second sub-laser beam 114 and transmits fluorescence to the reflecting surface. The fluorescence is specifically yellow fluorescence and is Lambertian light. The reflecting surface reflects the fluorescence 115 to the lens group 106, which collimates the fluorescence 115 to the beam combiner module 105. The lens group 106 can focus the optical power of the fluorescence 115 to the beam combiner module 105 as much as possible. The description of the phosphor 106 is not limited to the embodiment. For example, the phosphor screen of the phosphor 106 is a fluorescent material system, which is a mixture of red phosphor powder and green phosphor powder. In this case, the red phosphor powder is excited by the second sub-laser beam 114 to obtain red fluorescence, and the green phosphor powder is excited by the second sub-laser beam 114 to obtain green fluorescence. In another example, the phosphor screen includes two different regions, one region formed by green phosphor powder and the other region formed by red phosphor powder.

[0096] The blue projection beam includes a first blue laser beam 111 and a first sub-laser beam 113. Specifically, the light source in this embodiment further includes a polarizing beam combiner module 107. For a description of the polarizing beam combiner module 107, please refer to the description of the beam combiner module 105. Further details will not be provided again. The first blue laser beam 111 emitted from the first blue light source 101 is transmitted to the polarizing beam combiner module 107. The polarizing beam combiner module 107 transmits the first blue laser beam 111 transparently to the beam combiner module 105. The first sub-laser beam 113 transmitted transparently from the beam splitting module 103 is transmitted to the polarizing beam combiner module 107. Optionally, the light source further includes a reflector 108. The reflector 108 reflects the first sub-laser beam 113 to the polarizing beam combiner module 107. The polarized beam combiner module 107 reflects the first sub-laser beam 113 to the beam combiner module 105. The beam combiner module 105 combines the first blue laser beam 111, the first sub-laser beam 113, and the fluorescence 115 to obtain a projected light beam. Specifically, the first blue laser beam 111 and the first sub-laser beam 113 are transmitted through the beam combiner module 105, and the fluorescence 115 is reflected from the beam combiner module 105. The beam combiner module 105 can output the projected light beam using a beam combining method such as spectral beam combining, polarized beam combining, or aperture beam combining. The specific beam combining method is not limited. The projected light beam output by the light source is transmitted to the imaging engine, which modulates the projected light beam to perform imaging. In this embodiment, the description of the optical paths of the first sub-laser light, the first blue laser light 111, and the fluorescence 115 emitted by the light source is an example of an optional design and is not limited as long as the light source shown in this embodiment can successfully transmit the projection light beam, including the first blue laser light 111, the first sub-laser light, and the fluorescence 115, to the imaging engine.

[0097] It can be understood that both the first blue laser beam 111 and the first sub-laser beam 113 received by the polarized beam combiner module 107 are in the blue band. The polarized beam combiner module 107 distinguishes the first blue laser beam 111 from the first sub-laser beam 113 based on polarization, and as a result, the first blue laser beam 111 is transmitted transparently from the polarized beam combiner module 107 and successfully transmitted to the beam combiner module 105. The first sub-laser beam 113 is reflected from the polarized beam combiner module 107 and successfully transmitted to the beam combiner module 105. Optionally, in another example, the first blue laser beam 111 is reflected from the polarized beam combiner module 107 and successfully transmitted to the beam combiner module 105. The first sub-laser beam 113 is transmitted transparently from the polarized beam combiner module 107 and successfully transmitted to the beam combiner module 105. The polarized beam combiner module 107 ensures that both the first blue laser beam 111 and the first sub-laser beam 113 in the blue band are properly transmitted to the beam combiner module 105 based on polarization, and ensures proper imaging by the imaging engine based on the projected light beam.

[0098] In this embodiment, the projection light beam transmitted from the light source to the imaging engine includes a blue projection light beam (i.e., a first blue laser beam and a first sub-laser beam), a red projection light beam (i.e., red fluorescence), and a green projection light beam (i.e., green fluorescence). For the output of the projection light beams, please refer to Figure 2. Figure 2 is an exemplary diagram of the first spectral distribution of the projection light beam according to the present application. In the exemplary diagram of the spectral distribution, the horizontal coordinates are the frequency bands corresponding to the projection light beams, in units of nm. The vertical coordinates are the normalized optical power, in units of watts (W). The blue projection light beam output by the projection light beam has a bandwidth range of 400 nm to 480 nm and has two different wavelengths, namely the wavelength of the first blue laser beam 111 at 465 nm and the wavelength of the first sub-laser beam at 455 nm. That is, the blue projection light beam is narrowband laser light. The green projection light beam is green fluorescence, has a bandwidth range of 500 nm to 600 nm, and is broad-spectrum fluorescence. The red projected light beam is red fluorescent, has a bandwidth range of 600 nm to 660 nm, and exhibits broad spectral fluorescence.

[0099] A separate first blue laser beam or first sub-laser beam generates speckle. Speckle is a randomly distributed pattern of bright and dark spots formed in space when blue laser light is transmitted coherently during transmission as it is reflected, scattered, or transmitted from a rough surface. In this embodiment, the blue projection beam includes a first blue laser beam and a first sub-laser beam with different wavelengths and polarizations. This reduces the coherent superposition of the first blue laser beam and the first sub-laser beam during transmission, and therefore no interference is generated. This effectively reduces interference between the first blue laser beam and the first sub-laser beam, reduces speckle contrast, and effectively implements speckle suppression of the blue laser light. Speckle contrast indicates the severity of speckle on the image formed by the projection beam. Speckle contrast C can be expressed as follows:

number

[0100] Here, Std(I) represents the standard deviation of the intensity on the image, and Mean(I) represents the mean value of the intensity on the image. The speckle contrast C value is in the range of 0% to 100%. A higher speckle contrast indicates that the speckles are more severe. If the speckle contrast C is less than 5%, the speckles are not perceptible to the human eye. When the speckle contrast of the projected light beam in this embodiment is effectively reduced, it can be understood that the clarity of the image formed by the projected light beam is effectively improved.

[0101] In this embodiment, an example is used in which the blue projection beam includes two blue laser beams with different wavelengths and polarizations (i.e., a first blue laser beam and a first sub-laser beam). It should be noted that the projection beam shown in this embodiment includes N beams of blue laser light with different wavelengths and polarizations, where N is any integer greater than or equal to 2. In this case, after the N beams of blue laser light are combined, the speckle contrast has a negative correlation with the value of N. In other words, a larger value of N indicates lower speckle contrast; a smaller value of N indicates higher speckle contrast.

[0102] The light source in this embodiment can further dynamically adjust the chromaticity coordinates of the projected light beam. Figure 3 is an illustrative diagram of the first chromaticity coordinates of the projected light beam according to the present invention. Chromaticity coordinates refer to the coordinates of a color and are also called color systems. Chromaticity coordinates accurately represent color by using a two-dimensional coordinate system (horizontal axis is x, vertical axis is y). The triangle 310 shown in Figure 3 (the triangle represented by the dashed line) represents the color gamut that can be represented by a three-color light source consisting of blue (first blue laser light), red (red fluorescence), and green (green fluorescence). Specifically, the chromaticity coordinates of the first blue laser light are (0.135, 0.041), the chromaticity coordinates of the green fluorescence are (0.339, 0.634), and the chromaticity coordinates of the red fluorescence are (0.656, 0.344). Triangle 320 (represented by a solid line) represents the color gamut that can be represented by a three-color light source consisting of blue (first sub-laser light), red (red fluorescence), and green (green fluorescence). Specifically, the chromaticity coordinates of the first sub-laser light are (0.150, 0.023), the chromaticity coordinates of the green fluorescence are (0.339, 0.634), and the chromaticity coordinates of the red fluorescence are (0.656, 0.344). It should be noted that the specific values ​​of the chromaticity coordinates described in this embodiment are examples of arbitrary choices and are not limiting. In the projected light beam, it can be understood that the chromaticity coordinates of the projected light beam change due to the different value relationships between the optical power of the first blue laser light and the optical power of the first sub-laser light. For example, if the optical power of the first blue laser light is greater than the optical power of the first sub-laser light in the projected light beam, the chromaticity coordinates of the projected light beam are closer to triangle 310. When the optical power of the first sub-laser beam is greater than the optical power of the first blue laser beam, the chromaticity coordinate of the projected light beam is closer to triangle 320. It can be understood that the light source can adjust the chromaticity coordinate of the projected light beam by adjusting the value relationship between the optical power of the first blue laser beam and the optical power of the first sub-laser beam. In addition, different chromaticity coordinates of the projected light beam correspond to different color gamut coverage and different color gamut area ratios.For example, when the optical power of the first sub-laser beam is greater than the optical power of the first blue laser beam, according to the high-definition digital video standard (ITU-R Recommendation BT.709) released by the International Telecommunication Union, abbreviated as BT.709, the color gamut coverage of the projected light beam is 90.57%, and the color gamut area ratio is 110.89%. When the optical power of the first blue laser beam is greater than the optical power of the first sub-laser beam, according to BT.709, the color gamut coverage is 94.87%, and the color gamut area ratio is 110.28%.

[0103] It can be understood that by adjusting the value relationship between the optical power of the first blue laser beam and the optical power of the second blue laser beam, the value relationship between the optical power of the first blue laser beam and the optical power of the first sub-laser beam is adjusted. In addition, the value relationship between the optical power of the first blue laser beam and the optical power of the first sub-laser beam is related to the chromaticity coordinates of the projected light beam. The process of adjusting the chromaticity coordinates of the projected light beam by the light source is described below. In this embodiment, the first blue light source 101 and the second blue light source 102 are further connected separately to a controller. The controller is a component of the light source, or a component of the imaging engine, or a component in the projection system that is separate from the light source and the imaging engine. This is not specifically limited to the embodiment. In this embodiment, an example is used in which the light source includes a controller. The controller may be one or more field-programmable gate arrays (FPGA), application-specific integrated circuit (ASIC), system on chip (SoC), central processing unit (CPU), network processor (NP), digital signal processor (DSP), microcontroller unit (MCU), programmable logic device (PLD), image processor, another integrated chip, any combination of the above chips or processors, or similar. The controller transmits a first light emission signal to a first blue light source and a second light emission signal to a second blue light source. The first blue light source emits a first blue laser light based on the first light emission signal, and the second blue light source emits a second blue laser light based on the second light emission signal. In this embodiment, the first and second light emission signals are used together to adjust the value relationship between the optical power of the first blue laser light and the optical power of the second blue laser light.For example, the controller adjusts the optical power of the first blue laser light by controlling the current value of the first light emission signal. The current value of the first light emission signal has a positive correlation with the optical power of the first blue laser light. For an explanation of how the controller controls the optical power of the second blue laser light by using the second light emission signal, please refer to the explanation of how the controller controls the optical power of the first blue laser light by using the first light emission signal. Further details will not be explained again.

[0104] Optionally, the controller in this embodiment may receive adjustment commands, which command the controller to adjust the chromaticity coordinates of the projected light beam. The controller may be understood to adjust the chromaticity coordinates of the projected light beam by adjusting the value relationship between the first blue laser beam and the second blue laser beam according to the adjustment command. For example, the light source may include a physical button, such as a toggle button, and the user inputs an adjustment command by toggling the toggle button. In another example, the light source may include a touchscreen, which is configured to receive touch events entered by the user. The controller may then generate an adjustment command based on the touch events. In yet another example, the controller may be connected to a sensor, which may detect the environment in which the light source is located, for example, the brightness of the environment. The controller may then generate an adjustment command based on the environment detected by the sensor. The method by which the controller obtains adjustment commands is not limited to the embodiment.

[0105] The relationship between the optical power of the first blue laser beam and the optical power of the second blue laser beam in this embodiment can be further used to adjust the color temperature of the projected light beam. For example, when the optical power of the second blue laser beam remains constant, increasing the optical power of the first blue laser beam can increase the proportion of the blue laser beam's optical power in the projected light beam. In this case, the color temperature of the projected light beam increases accordingly. In another example, when the optical power of the first blue laser beam remains constant, increasing the optical power of the second blue laser beam can increase the proportion of the fluorescence's optical power in the projected light beam. In this case, the color temperature of the projected light beam decreases accordingly. In a specific example, when the optical power of the second blue laser beam is greater than the optical power of the first blue laser beam, the optical power of the first sub-laser beam accounts for approximately 30% of the optical power of the projected light beam, and the color temperature of the projected light beam is approximately 6500 Kelvin (K). When the optical power of the first blue laser beam is increased, the optical power of the blue laser beam accounts for approximately 38% of the optical power of the projected light beam, and the color temperature of the projected light beam is approximately 9000 K.

[0106] In the projection light beam emitted by the light source to the imaging engine shown in Figure 1, only the blue projection light beam is laser light. However, in the projection light beam emitted by the light source to the imaging engine shown in Figure 4, both the blue and red projection light beams are laser light, and as a result, the color gamut of the projection light beam is increased. Figure 4 is an illustrative diagram of the structure of a second embodiment of the light source according to the present application.

[0107] The light source in this embodiment includes a first blue light source 401, a second blue light source 402, a beam splitting module 403, a phosphor 404, and a red light source 405. The first blue light source 401 emits one or more beams of first blue laser light 411. The second blue light source 402 emits one or more beams of second blue laser light 412. For a description of the first blue light source 401, the second blue light source 402, the first blue laser light 411, and the second blue laser light 412 in this embodiment, please refer to the description corresponding to Figure 1. Further details will not be explained again. The beam splitting module 403 splits the second blue laser light 412 to obtain a first sub-laser light 413 and a second sub-laser light 414. For a description of the beam splitting module 403, the first sub-laser light 413, and the second sub-laser light 414, please refer to the description corresponding to Figure 1. Further details will not be explained again.

[0108] In this embodiment, the red light source 405 emits red laser light 421. The wavelength of the red laser light 421 is within the band range of 640 nm to 650 nm. The number of wavelengths included in the red laser light 421 and the specific wavelength values ​​are not limited to this embodiment. For a description of the red light source 405, please refer to the description of the first blue light source corresponding to Figure 1. Further details will not be described again. The light source further includes an optical filter 408. The optical filter 408 is located on the transmission optical path of the red laser light 421 emitted from the red light source 405. The optical filter 408 transmits the red laser light 421 transparently to the polarized beam combiner module 407. For a description of the polarized beam combiner module 407, please refer to the description corresponding to Figure 1. Further details will not be described again. The optical filter 408 further receives the first sub-laser light 413 transmitted transparently from the beam splitting module 403 and reflects the first sub-laser light 413 to the polarized beam combiner module 407. In this embodiment, the polarized beam combiner module 407 can be understood to receive three laser beams: a first blue laser beam 411, a first sub-laser beam 413, and a red laser beam 421. For a description of the transmission of the first blue laser beam 411 to the polarized beam combiner module 407, please refer to the description corresponding to Figure 1. Further details will not be explained again. The polarized beam combiner module 407 transmits the first blue laser beam 411 transparently to the beam combiner module 405. The polarized beam combiner module 407 further reflects the first sub-laser beam 413 and the red laser beam 421 to the beam combiner module 405. For a description of the beam combiner module 405 in this embodiment, please refer to the description corresponding to Figure 1. Further details will not be explained again.

[0109] The second sub-laser beam 414 reflected from the beam splitting module 403 is transmitted to the phosphor 404. For a description of the transmission of the second sub-laser beam 414 to the phosphor 404, please refer to the description corresponding to Figure 1. Further details will not be explained again. In order for the projection system to project a color image, the projection light beam emitted by the light source includes a red projection light beam, a green projection light beam, and a blue projection light beam. The blue projection light beam includes the first blue laser beam 411 and the first sub-laser beam 413. For a description of the blue projection light beam, please refer to the description corresponding to Figure 1. Further details will not be explained again. The red projection light beam is the red laser beam 421 emitted by the red light source 405. The green projection light beam is the green fluorescence 415 acquired when the phosphor 404 is excited by the second sub-laser beam 414. The phosphor 404 includes a fluorescent surface and a reflective surface. The fluorescent surface is oriented towards the lens group 406. For a description of lens group 406, please refer to the description corresponding to Figure 1. Further details will not be explained again. In order to obtain green fluorescence, the fluorescence screen in this embodiment is formed of green phosphor powder. The fluorescence screen is excited by the second sub-laser beam 414 and transmits green fluorescence to the reflective surface. The reflective surface reflects the green fluorescence 415 to lens group 406, and lens group 406 collimates the green fluorescence 415 to the beam combiner module 405. In this embodiment, an example is used in which the phosphor 404 contains only green phosphor powder. Since the phosphor 404 contains only green phosphor powder, the optical power of the green fluorescence contained in the projection light beam is effectively ensured. In another example, the phosphor 404 further contains red phosphor powder. The red phosphor powder is excited by the second sub-laser beam 414 to generate red fluorescence. The red fluorescence and the red laser beam 421 are used together as a red projection light beam to effectively suppress speckle of the red laser beam.

[0110] The beam combiner module 405 combines the first blue laser beam 411, the first sub-laser beam 413, the red laser beam 421, and the green fluorescence beam 415 to acquire a projected light beam. Specifically, the first blue laser beam 411, the first sub-laser beam 413, and the red laser beam 421 are transmitted through the beam combiner module 405, while the green fluorescence beam 415 is reflected from the beam combiner module 405. For a detailed explanation of the beam combiner module 405, please refer to the explanation corresponding to Figure 1. Further details will not be explained again.

[0111] In this embodiment, the projection light beam transmitted from the light source to the imaging engine includes a blue projection light beam (i.e., a first blue laser beam and a first sub-laser beam), a red projection light beam (i.e., a red laser beam), and a green projection light beam (i.e., green fluorescence). In this embodiment, both the blue projection light beam and the red projection light beam of the projection light beam can be understood as laser light. Compared to the embodiment shown in Figure 1, where only the blue projection light beam of the projection light beam is laser light, this embodiment effectively expands the color gamut. For the output of the projection light beam, please refer to Figure 5. Figure 5 is an illustrative diagram of the second spectral distribution of the projection light beam according to the present application. For an explanation of the coordinate system of the illustrative spectral distribution shown in Figure 5, please refer to Figure 2. Further details will not be explained again. In the illustrative spectral distribution shown in Figure 5, the blue projection light beam output by the projection light beam has a bandwidth range of 400 nm to 480 nm and has two different wavelengths, namely, the wavelength of the first blue laser beam 111 at 465 nm and the wavelength of the first sub-laser beam at 455 nm. The blue laser light is a narrowband laser light. The red projection beam has a bandwidth range of 600 nm to 660 nm and includes a segment of narrowband red laser light. Optionally, the red projection beam may further include a segment of broad-spectrum fluorescence, which is generated when the phosphor is excited by a second sub-laser light. The green projection beam has a bandwidth range of 500 nm to 600 nm and is broad-spectrum fluorescence. The projection beams in this embodiment can effectively suppress speckle. For an explanation of speckle suppression, please refer to the explanation corresponding to Figure 1. Further details will not be explained again.

[0112] The light source in this embodiment can further dynamically adjust the chromaticity coordinates of the projected light beam. Figure 6 is an illustrative diagram of the second chromaticity coordinates of the projected light beam according to the present invention. The triangle 610 (represented by a dashed line) shown in Figure 6 represents the color gamut that can be represented by a three-color light source consisting of blue (first blue laser light), red (red laser light and red fluorescence), and green (green fluorescence). Specifically, the chromaticity coordinates of the first blue laser light are (0.135, 0.041), the chromaticity coordinates of the green fluorescence are (0.251, 0.68), and the chromaticity coordinates of the red laser light and red fluorescence are (0.684, 0.316). The triangle 620 (represented by a solid line) represents the color gamut that can be represented by a three-color light source consisting of blue (first sub-laser light), red (red laser light and red fluorescence), and green (green fluorescence). Specifically, the chromaticity coordinates of the first sub-laser beam are (0.150, 0.023), the chromaticity coordinates of the green fluorescence are (0.251, 0.68), and the chromaticity coordinates of the red laser beam are (0.684, 0.316). It should be noted that the specific values ​​of the chromaticity coordinates described in this embodiment are examples of arbitrary choices and are not limiting. In the projected light beam, it can be understood that the chromaticity coordinates of the projected light beam change due to different value relationships between the optical power of the first blue laser beam and the optical power of the first sub-laser beam. For example, if the optical power of the first blue laser beam is greater than the optical power of the first sub-laser beam in the projected light beam, the chromaticity coordinates of the projected light beam are closer to triangle 610. If the optical power of the first sub-laser beam is greater than the optical power of the first blue laser beam, the chromaticity coordinates of the projected light beam are closer to triangle 620. It can be understood that the light source can adjust the chromaticity coordinates of the projected light beam by adjusting the value relationship between the optical power of the first blue laser beam and the optical power of the first sub-laser beam. The color gamut coverage and color gamut area ratio are adjusted to correspond to different chromaticity coordinates of the projected light beam. For example, when the optical power of the first sub-laser light is greater than the optical power of the first blue laser light, according to BT.709, the projected light beam has a color gamut coverage of 96.92% and a color gamut area ratio of 104.9%. When the optical power of the first blue laser light is greater than the optical power of the first sub-laser light, according to BT.709, the color gamut coverage is 96.55% and the color gamut area ratio is 105.67%.For an explanation of how to adjust the chromaticity coordinates of the projected light beam by adjusting the value relationship between the optical power of the first blue laser beam and the optical power of the second blue laser beam, please refer to the explanation corresponding to Figure 3. Further details will not be explained again. The value relationship between the optical power of the first blue laser beam and the optical power of the second blue laser beam in this embodiment can also be used to adjust the color temperature of the projected light beam. For a specific explanation, please refer to the embodiment corresponding to Figure 1. Further details will not be explained again.

[0113] In the projection light beam emitted by the light source to the imaging engine shown in Figure 1, only the blue projection light beam is laser light. However, in the projection light beam emitted by the light source to the imaging engine shown in Figure 7, the blue projection light beam, red projection light beam, and green projection light beam are all laser light, and as a result, the color gamut of the projection light beam increases. Figure 7 is an illustrative diagram of the structure of the third embodiment of the light source according to the present application.

[0114] The light source in this embodiment includes a three-color laser 701, a second blue light source 702, a beam splitting module 703, and a phosphor 704. The three-color laser 701 integrates a first blue light source emitting a first blue laser beam 711, a red light source emitting a red laser beam 712, and a green light source emitting a green laser beam 713. For a description of the first blue light source, please refer to the description corresponding to Figure 1. Further details will not be provided again. For a description of the structure of the second blue light source 702, the red light source, and the green light source, please refer to the description of the first blue light source. Further details will not be provided again. In this embodiment, an example is used in which the first blue light source, the red light source, and the green light source are integrated into the same three-color laser. In this case, an example is used, but is not limited to, in which the transmission directions of the first blue laser beam 711, the red laser beam 712, and the green laser beam 713 in the light source are the same. In another example, the first blue light source, the red light source, and the green light source may be positioned at different locations within the light source, resulting in at least two of the first blue laser beam 711, the red laser beam 712, and the green laser beam 713 having different transmission directions within the light source. The second blue light source 702 emits the second blue laser beam 710. For a description of the first blue laser beam 711 and the second blue laser beam 710 in this embodiment, please refer to the description corresponding to Figure 1. Further details will not be provided again. The beam splitting module 703 splits the second blue laser beam 710 to obtain the first sub-laser beam 714 and the second sub-laser beam 715. For a description of the beam splitting module 703, the first sub-laser beam 714, and the second sub-laser beam 715, please refer to the description corresponding to Figure 1. Further details will not be provided again.

[0115] The light source further includes an optical filter 708. The optical filter 708 is positioned on the transmission optical path of the first blue laser beam 711, the red laser beam 712, and the green laser beam 713 emitted from the three-color laser 701. The optical filter 708 transmits the first blue laser beam 711, the red laser beam 712, and the green laser beam 713 transparently to the reflector 707. For a description of the reflector 707, please refer to the description corresponding to Figure 1. Further details will not be described again. The optical filter 708 further receives the first sub-laser beam 714 transmitted transparently from the beam splitting module 703 and reflects the first sub-laser beam 714 to the reflector 707. In this embodiment, the reflector 707 can be understood to receive four beams of laser light, which are the first blue laser beam 711, the first sub-laser beam 714, the red laser beam 712, and the green laser beam 713, respectively. The reflector 707 reflects and transmits the first blue laser beam 711, the first sub-laser beam 714, the red laser beam 712, and the green laser beam 713 to the beam combiner module 705. For a description of the beam combiner module 705 in this embodiment, please refer to the description corresponding to Figure 1. Further details will not be explained again.

[0116] The second sub-laser beam 715 reflected from the beam splitting module 703 is transmitted to the phosphor 704. For an explanation of the transmission of the second sub-laser beam 715 to the phosphor 704, please refer to the explanation corresponding to Figure 1. Further details will not be explained again. The phosphor 704 acquires fluorescence 716 under excitation by the second sub-laser beam 715, and the fluorescence 716 includes green fluorescence and red fluorescence. For an explanation of the phosphor, green fluorescence, and red fluorescence, please refer to the explanation corresponding to Figure 1. Further details will not be explained again. The lens group 706 collimates the fluorescence 716 to the beam combiner module 705.

[0117] To enable the projection system to project a color image, the projection light beam emitted by the light source includes a red projection light beam, a green projection light beam, and a blue projection light beam. The blue projection light beam includes a first blue laser beam 711 and a first sub-laser beam 714. For a description of the blue projection light beam, please refer to the description corresponding to Figure 1. Further details will not be provided again. The red projection light beam includes red laser light 712 emitted by the red light source and red fluorescence contained in fluorescence 716. Red fluorescence can effectively suppress speckle of the red laser light. The green projection light beam includes green laser light 713 emitted by the green light source and green fluorescence contained in fluorescence 716. Green fluorescence can effectively suppress speckle of the green laser light. The beam combiner module 705 combines the first blue laser light 711, the first sub-laser beam 714, the red laser light 712, the green laser light 713, and the fluorescence 716 to obtain the projection light beam. Specifically, the first blue laser beam 711, the first sub-laser beam 714, the red laser beam 712, and the green laser beam 713 are transmitted through the beam combiner module 705, while the fluorescence 716 is reflected from the beam combiner module 705. For a detailed explanation of the beam combiner module 705, please refer to the explanation corresponding to Figure 1. Further details will not be explained again.

[0118] In this embodiment, the projection light beam transmitted from the light source to the imaging engine includes a blue projection light beam (i.e., a first blue laser beam and a first sub-laser beam), a red projection light beam (i.e., red laser beam and red fluorescence), and a green projection light beam (i.e., green laser beam and green fluorescence). In this embodiment, the blue projection light beam, red projection light beam, and green projection light beam of the projection light beam can all be understood to include laser light. Compared to the embodiment shown in Figure 1, in which only the blue projection light beam of the projection light beam is laser light, this embodiment effectively expands the color gamut. For the output of the projection light beam, please refer to Figure 8. Figure 8 is an illustrative diagram of the third spectral distribution of the projection light beam according to this application. For an explanation of the coordinate system of the illustrative spectral distribution diagram shown in Figure 8, please refer to Figure 2. Further details will not be explained again. In the illustrative spectral distribution shown in Figure 8, the blue projection beam output by the projection beam has a bandwidth range of 400 nm to 480 nm and has two different wavelengths, namely, the wavelength of the first blue laser light at 465 nm and the wavelength of the first sub-laser light at 455 nm. The blue laser light is a narrowband laser light. The red projection beam has a bandwidth range of 600 nm to 660 nm and includes a broad-spectrum red fluorescence segment and a narrowband red laser light segment. The green projection beam has a bandwidth range of 500 nm to 600 nm and includes a broad-spectrum green fluorescence segment and a narrowband green laser light segment. The projection beams in this embodiment can effectively suppress speckle. For an explanation of speckle suppression, please refer to the explanation corresponding to Figure 1. Further details will not be explained again.

[0119] In this embodiment, the light source can further dynamically adjust the chromaticity coordinates of the projected light beam. For a detailed explanation, please refer to the explanation corresponding to Figure 3. Further details will not be explained again.

[0120] Figure 9 is an illustrative diagram of the structure of a first embodiment of the projection system according to the present application. The projection system in this embodiment includes a light source 901 and an imaging engine. For a description of the light source 901, please refer to one of the embodiments in Figures 1, 4, or 7. Further details will not be described again. The imaging engine includes three modulation modules: a red modulation module 911, a green modulation module 912, and a blue modulation module 913. The imaging engine further includes two color filter modules: a color filter module 921 and a color filter module 922. The color filter module 921 may be a color separation mirror, a dichroic mirror, a dichroic reflector, a prism, or the like. This is not specifically limited. The imaging engine further includes a focusing module 914 and a lens assembly 951. The focusing module 914 may be an optical component used for optical focusing, such as a cross-bidirectional prism.

[0121] Specifically, the color filter module 921 receives the projection light beam 902 from the light source 901. The color filter module 921 acquires the red projection light beam 903 from the projection light beam 921. The color filter module 921 transmits the red projection light beam 903 to the red modulation module 911. The red modulation module 911 modulates the red projection light beam 903 and transmits the modulated red light beam 904 to the focusing module 914. The color filter module 921 further acquires the green projection light beam 931 and the blue projection light beam 941 from the light beam. The color filter module 921 reflects the green projection light beam 931 and the blue projection light beam 941 to the color filter module 922 through the reflector 916. The color filter module 922 transmits the green projection light beam 931 to the green modulation module 912. The green modulation module 912 modulates the green projection light beam 931 and transmits the modulated green light beam 932 to the focusing module 914. The color filter module 922 further transmits the blue projection light beam 941 sequentially to the blue modulation module 913 through reflectors 907 and 908. The blue modulation module 913 modulates the blue projection light beam 941 and transmits the modulated blue light beam 942 to the focusing module 914. The focusing module 914 converges the modulated blue light beam 942, the modulated red light beam 904, and the modulated green light beam 932 to obtain the modulated light beam 950 and transmits the modulated light beam 950 to the lens assembly 951. It should be noted that the description in this embodiment of the imaging engine transmitting the red projection light beam to the red modulation module 911, the green projection light beam to the green modulation module 912, and the blue projection light beam to the blue modulation module 913 is an optional example and not limiting.

[0122] The red modulation module 911 is used as an example. The red modulation module 911 acquires the image source to be projected. The image source may be a video or a picture. Optionally, the red modulation module 911 in this embodiment may include an external interface. The red modulation module 911 receives the image source from any electronic device through the external interface. The external interface is connected to an electronic device. The external interface may be an external bus interface, a front-side bus, a display interface, a video display interface, a graphics interface, or similar. The video display interface may be a digital visual interface (DVI), a high-definition multimedia interface (HDMI®), a video graphics array (VGA), or similar. Optionally, the red modulation module 911 in this embodiment may include an internal interface. The internal interface of the red modulation module 911 is connected to a controller. The red modulation module 911 receives the image source from the controller through the internal interface. The internal interface may be a bus, a local input / output (I / O) port bus, a hub interface bus, or similar. The red modulation module 911 modulates the red projected light beam from the light source 901 based on the image source to obtain a modulated red light beam 904 corresponding to the image source. The red modulation module 911 may be a liquid crystal display (LCD), a digital micromirror device (DMD), a liquid crystal on silicon (LCOS), or similar. For descriptions of the green modulation module 912 and the blue modulation module 913, please refer to the description of the red modulation module 911. Further details will not be provided again.

[0123] The lens assembly 951 receives the modulated light beam 950 and images the modulated light beam 950. The lens assembly 951 includes one or more lenses. An enlarged real image of the modulated light beam 950 is formed on the lens. The lens may be a convex or concave lens. Optionally, the projection system in this embodiment may further include a projection screen. In this case, the real images corresponding to the modulated light beam 950 emitted by the lens assembly 951 can be displayed separately on the projection screen.

[0124] Figure 9 shows an example in which the light source is used in a three-chip imaging engine. The three-chip imaging engine is an imaging engine that includes three modulation modules: a red modulation module 911, a green modulation module 912, and a blue modulation module 913. The light source shown in Figure 10 is used in a single-chip imaging engine. The single-chip imaging engine is an imaging engine that includes only one modulation module. Figure 10 is an illustrative diagram of the structure of a fourth embodiment of the light source according to the present application.

[0125] The light source in this embodiment includes a first blue light source 101, a second blue light source 102, a beam splitting module 103, and a phosphor 104. For a detailed explanation, please refer to the explanation corresponding to Figure 1. Further details will not be explained again. The light source in this embodiment further includes a color filter wheel 1001. The color filter wheel 1001 in this embodiment can be rotated under the drive of a controller. The color filter wheel 1001 is coated with blue, red, and green films. When the blue coated film is rotated into the transmission optical path of the projection light beam emitted from the beam combiner module 105, only the blue projection light beam can pass through the color filter wheel 1001 and be transmitted to the imaging engine. When the red coated film is rotated into the transmission optical path of the projection light beam emitted from the beam combiner module 105, only the red projection light beam can pass through the color filter wheel 1001 and be transmitted to the imaging engine. Similarly, when the green coating film is rotated into the transmission path of the projection beam emitted from the beam combiner module 105, only the green projection beam can pass through the color filter wheel 1001 and be transmitted to the imaging engine. It should be noted that the light source may further include a red light source that emits red laser light. For a specific explanation, see the explanation corresponding to Figure 4. The light source may further include a green light source that emits green laser light. For a specific explanation, see the explanation corresponding to Figure 7. Further details will not be provided again.

[0126] Based on the color filter wheel 1001 in this embodiment, a blue projection beam can be transmitted to the imaging engine in the first period, a green projection beam can be transmitted to the imaging engine in the second period, and a red projection beam can be transmitted to the imaging engine in the third period. Any two of the first, second, and third periods are distinct on the time axis. It can be understood that the blue projection beam, red projection beam, and green projection beam are transmitted to the imaging engine at different times.

[0127] Figure 11 is an illustrative diagram of the structure of a second embodiment of the projection system according to the present application. The projection system in this embodiment includes a light source 1101, a modulation module 1102, and a lens assembly 1103. For a description of the structure of the light source 1101, please refer to the description corresponding to Figure 10. Further details will not be provided. For a description of the modulation module 1102 and the lens assembly 1103, please refer to the description corresponding to Figure 9. Further details will not be provided.

[0128] Specifically, the light source 1101 can emit a blue projection beam, a green projection beam, and a red projection beam at different times. For a detailed explanation, please refer to the explanation corresponding to Figure 10. Further details will not be explained again. Optionally, the imaging engine further includes a lens group 1104 and a reflector 1105. The blue projection beam emitted from the light source 1101 is collimated by the lens group 1104 and then focused to the reflector 1105. The reflector 1105 reflects the blue projection beam to the modulation module 1102. The modulation module 1102 modulates the blue projection beam and transmits the modulated blue beam to the lens assembly 1103. For an explanation of transmitting the red and green projection beams to the modulation module 1102, please refer to the explanation of transmitting the blue projection beam to the modulation module 1102. Further details will not be explained again. Since the blue projection beam, green projection beam, and red projection beam are transmitted to the imaging engine at different times, it can be understood that the modulation module 1102 can modulate the blue projection beam, green projection beam, and red projection beam at different times, thereby obtaining a modulated blue light beam, a modulated green light beam, and a modulated red light beam.

[0129] Figure 12 is an illustrative diagram of the structure of a second embodiment of the projection system according to the present invention. The projection system in this embodiment comprises a light source 1201, a modulation module 1202, a color filter wheel 1206, and a lens assembly 1203. The light source 1201 can transmit a projection light beam 1211 to an imaging engine. The projection light beam 1211 is a combination of a blue projection light beam, a red projection light beam, and a green projection light beam. For a detailed explanation, please refer to the description corresponding to Figure 1, Figure 4, or Figure 7. Further details will not be explained again. For a description of the color filter wheel 1206, please refer to the description corresponding to Figure 10. Further details will not be explained again.

[0130] Specifically, the projection light beam 1211 emitted by the light source 1201 is collimated by the lens group 1204 and then focused by the color filter wheel 1206. The color filter wheel 1206 filters the projection light beam so that the green projection light beam, blue projection light beam, and red projection light beam can be transmitted to the reflector 1205 at different times. The green projection light beam is used as an example. The reflector 1205 reflects the green projection light beam to the modulation module 1202. The modulation module 1202 modulates the green projection light beam and transmits the modulated green light beam to the lens assembly 1203. For an explanation of transmitting the red and blue projection light beams to the modulation module 1202, please refer to the explanation of transmitting the green projection light beam to the modulation module 1202. Further details will not be explained again. Since the blue projection beam, green projection beam, and red projection beam are transmitted to the modulation module 1202 at different times, it can be understood that the modulation module 1202 can modulate the blue projection beam, green projection beam, and red projection beam at different times to obtain a modulated blue light beam, a modulated green light beam, and a modulated red light beam.

[0131] Figure 13 is an illustrative diagram of the structure of an embodiment of the head-up display system according to the present invention. The head-up display (HUD) system in this embodiment includes a light source 1301, an imaging engine 1302, and a light deflection module. For a description of the structure of the light source 1301 and the imaging engine 1302, please refer to any one of the embodiments in Figure 9, Figure 11, or Figure 12. Further details will not be described again. The HUD system projects vehicle-related information into the driver's forward field of view. Vehicle-related information may be instrument information (e.g., vehicle speed), navigation information, or similar. In this case, the driver can see the vehicle-related information in their forward field of view and does not need to look down to observe the steering wheel or the instrument panel below the central display screen. This can improve brake reaction time in emergencies and enhance driving safety.

[0132] In this embodiment, the light source 1101 transmits a projected light beam to the imaging engine 1302. The imaging engine 1302 can modulate vehicle-related information on the projected light beam to obtain a modulated light beam 1311. The optical deflection module 1311 can transmit the modulated light beam forward of the vehicle to form an amplified virtual image 1312. The optical deflection module in this embodiment includes a curved mirror 1303. The curved mirror 1303 transmits the light spot of the amplified modulated light beam 1311 to the vehicle's windshield 1304. The windshield 1304 reflects the modulated light beam 1311 towards the driver's eyes to form an image. In other words, the inverse extension of the image formed in the driver's eyes forms the virtual image 1312 in front of the vehicle. In this embodiment, an example is used in which the HUD system is used in a vehicle. In another example, the HUD system may be used in a driving tool that needs to be driven by a driver, such as a ship, aircraft, or helicopter.

[0133] The embodiment further provides a vehicle, which includes a HUD system and a windshield as shown in Figure 13. Naturally, the vehicle may further include other components, such as a steering wheel, processor, memory, wireless communication device, and sensors. This is not specifically limited to the embodiment.

[0134] Figure 14 is an illustrative diagram of the structure of an embodiment of a projection headlight according to the present invention. The projection headlight includes a light source 1401 and an imaging engine 1402. For a description of the light source 1401 and the imaging engine 1402, please refer to the embodiments described above. Further details will not be described again. The light source 1401 transmits a projection light beam to the imaging engine 1402, which modulates the projection light beam and outputs a modulated light beam. The modulated light beam emitted from the imaging engine 1402 can be imaged on the road surface on which the vehicle is traveling. Specifically, the modulated light beam displays and images a target light pattern in the road surface projection area on the road surface. The target light pattern formed by the modulated light beam may be a light carpet displayed in the road surface projection area. The light carpet informs the driver of vehicle advanced driving assistance system (ADAS) information, key data on the vehicle's instrument panel (fuel consumption, engine speed, temperature, etc.), vehicle speed information, steering wheel angle information, vehicle attitude data, etc., through modulated images, colors, light patterns, or the like. This is not specifically limited to the embodiments. In these embodiments, modulated light beams emitted by projected headlights and displayed in a target light pattern may alternatively be used to illuminate the road surface around the vehicle, enhancing driving safety or navigation efficiency.

[0135] The projection headlights in this embodiment are used for vehicle lighting and image projection, and may be low beam or adaptive high beam, and implement assisted autonomous driving of the vehicle. The vehicle may be an autonomous vehicle (self-piloting automobile), also known as an unmanned vehicle. Alternatively, the vehicle may be a sedan, truck, motorcycle, public transport vehicle, lawnmower, amusement vehicle, playground vehicle, tram, golf cart, train, handcart, or similar.

[0136] This embodiment provides augmented reality (AR) glasses. AR glasses integrate virtual information with the real world, utilizing a wide range of technical means such as multimedia, 3D modeling, real-time tracking and registration, intelligent interaction and sensing to simulate computer-generated virtual information such as text, images, 3D models, music, or video, and then apply the simulated information to the real world. The two types of information complement each other to implement an "augmentation" of the real world. With the diversification of AR products, it is becoming more convenient for users to use AR products. AR glasses include a frame, lenses, a light source, and a modulation module. For a description of the light source and modulation module, please refer to the embodiment described above. Further details will not be described again. The light source and modulation module are fixed to the frame. The projection device transmits a projection light beam to the modulation module, which modulates the projection light beam to obtain a modulated light beam. The modulation module projects the modulated light beam onto the lens facing the wearer's eyes, and as a result, the lens reflects the modulated light beam back to the wearer's eyes using its reflective function.

[0137] Figure 15 is a flowchart of the steps of the first embodiment of the projection light beam transmission method according to the present invention. The method in this embodiment is applied to the light source shown in Figure 1. For a description of the structure of the light source, please refer to the description corresponding to Figure 1. Further details will not be explained again.

[0138] Step 1501: The first blue light source transmits the first blue laser light to the imaging engine.

[0139] Specifically, the first blue laser beam is transmitted to the imaging engine via a polarization beam combiner module based on the polarization of the first blue laser. For a description of the polarization beam combiner module, please refer to the explanation corresponding to Figure 1. Further details will not be explained again.

[0140] Step 1502: The second blue light source transmits the second blue laser light to the beam splitting module.

[0141] The wavelength of the first blue laser light is different from the wavelength of the second blue laser light, and the polarization of the first blue laser light is different from the polarization of the second blue laser light.

[0142] Step 1503: The beam splitting module splits the second blue laser beam to acquire the first sub-laser beam and the second sub-laser beam.

[0143] Step 1504: The beam splitting module transmits the first sub-laser beam to the imaging engine.

[0144] Specifically, the first sub-laser beam is transmitted to the imaging engine via a polarized beam combiner module based on the polarization of the first sub-laser beam.

[0145] Step 1505: The beam splitting module transmits the second sub-laser beam to the phosphor.

[0146] Step 1506: The phosphor acquires fluorescence under excitation of the second sub-laser light, and the phosphor transmits the fluorescence to the imaging engine.

[0147] For a description of the structure of the light source in this embodiment, the specific process of performing the projection light beam transmission method using the light source, and the beneficial effects, please refer to the description corresponding to Figure 1. Further details will not be explained again.

[0148] Figures 16A and 16B are flowcharts of the steps of a second embodiment of the projection light beam transmission method according to the present invention. The method in this embodiment is applied to the light source shown in Figure 1. For a description of the structure of the light source, please refer to the description corresponding to Figure 1. Further details will not be described again.

[0149] Step 1601: The controller transmits the first light emission signal to the first blue light source.

[0150] Step 1602: The controller transmits the second light emission signal to the second blue light source.

[0151] The first and second light emission signals are used together to adjust the value relationship between the optical power of the first blue laser beam and the optical power of the second blue laser beam, and this value relationship is related to the chromaticity coordinates of the projected light beam.

[0152] Step 1603: The first blue light source transmits the first blue laser light to the imaging engine.

[0153] Step 1604: The second blue light source transmits the second blue laser light to the beam splitting module.

[0154] In this embodiment, the first blue light source emits a first blue laser beam based on a first light emission signal, and the second blue light source emits a second blue laser beam based on a second light emission signal. The value relationship between the optical power of the first blue laser beam and the optical power of the second blue laser beam is a value relationship jointly shown by the first light emission signal and the second light emission signal. For an explanation of how the controller transmits the first light emission signal and the second light emission signal to adjust the chromaticity coordinates of the projected light beam, please refer to the explanation in Figures 1 to 3. Further details will not be explained again.

[0155] Step 1605: The beam splitting module splits the second blue laser beam to obtain the first sub-laser beam and the second sub-laser beam.

[0156] Step 1606: The beam splitting module transmits the first sub-laser beam to the imaging engine.

[0157] Step 1607: The beam splitting module transmits the second sub-laser beam to the phosphor.

[0158] Step 1608: The phosphor acquires fluorescence under excitation of the second sub-laser light, and the phosphor transmits the fluorescence to the imaging engine.

[0159] For a description of the execution process of steps 1605 to 1608 in this embodiment, please refer to the corresponding descriptions of steps 1503 to 1506 in Figure 15. Further details will not be explained again.

[0160] Figure 17 is a flowchart of the steps of a third embodiment of the projection light beam transmission method according to the present invention. The method in this embodiment is applied to the light source shown in Figure 4. For a description of the structure of the light source, please refer to the description corresponding to Figure 4. Further details will not be explained again.

[0161] Step 1701: The first blue light source transmits the first blue laser light to the imaging engine.

[0162] Step 1702: The second blue light source transmits the second blue laser light to the beam splitting module.

[0163] For a description of the execution process of steps 1701 and 1702 in this embodiment, please refer to the corresponding descriptions of steps 1501 and 1502 in Figure 15. Further details will not be explained again.

[0164] Step 1703: The red light source transmits red laser light to the imaging engine.

[0165] For an explanation of how a red laser beam is transmitted to the imaging engine by a red light source in this embodiment, please refer to the explanation corresponding to Figure 4. Further details will not be explained again.

[0166] Step 1704: The beam splitting module splits the second blue laser beam to obtain the first sub-laser beam and the second sub-laser beam.

[0167] Step 1705: The beam splitting module transmits the first sub-laser beam to the imaging engine.

[0168] Step 1706: The beam splitting module transmits the second sub-laser beam to the phosphor.

[0169] For a description of the execution process of steps 1704 to 1706 in this embodiment, please refer to the corresponding description of the execution process of steps 1503 to 1505 in Figure 15. Further details will not be explained again.

[0170] Step 1707: The phosphor acquires fluorescence under excitation of the second sub-laser light, and the phosphor transmits the fluorescence to the imaging engine.

[0171] For a specific explanation of how green fluorescence is generated by a phosphor under excitation of a second sublaser in this embodiment, please refer to the explanation corresponding to Figure 4. Further details will not be explained again.

[0172] Figure 18 is a flowchart of the steps of the fourth embodiment of the projection light beam transmission method according to the present invention. The method in this embodiment is applied to the light source shown in Figure 7. For a description of the structure of the light source, please refer to the description corresponding to Figure 7. Further details will not be described again.

[0173] Step 1801: The three-color laser transmits the first blue laser beam, the red laser beam, and the green laser beam to the imaging engine.

[0174] For a description of the execution process of step 1701 in this embodiment, please refer to the description corresponding to Figure 7. Further details will not be explained again.

[0175] Step 1802: The second blue light source transmits the second blue laser light to the beam splitting module.

[0176] For a description of the execution process of step 1802 in this embodiment, please refer to the corresponding description of step 1502 in Figure 15. Further details will not be explained again.

[0177] Step 1803: The beam splitting module splits the second blue laser beam to obtain the first sub-laser beam and the second sub-laser beam.

[0178] Step 1804: The beam splitting module transmits the first sub-laser beam to the imaging engine.

[0179] Step 1805: The beam splitting module transmits the second sub-laser beam to the phosphor.

[0180] Step 1806: The phosphor acquires fluorescence under excitation of the second sub-laser light, and the phosphor transmits the fluorescence to the imaging engine.

[0181] For a description of the execution process of steps 1803 to 1806 in this embodiment, please refer to the corresponding description of the execution process of steps 1503 to 1506 in Figure 15. Further details will not be explained again.

[0182] Figures 19A and 19B are flowcharts of the steps of the first embodiment of the projection method according to the present application. The projection method in this embodiment is applied to a projection system. For the structure of the projection system, please refer to one of the embodiments shown in Figure 9, Figure 11, or Figure 12. Further details will not be described again.

[0183] Step 1901: The first blue light source transmits the first blue laser light to the imaging engine.

[0184] Step 1902: The second blue light source transmits the second blue laser light to the beam splitting module.

[0185] Step 1903: The beam splitting module splits the second blue laser beam to obtain the first sub-laser beam and the second sub-laser beam.

[0186] Step 1904: The beam splitting module transmits the first sub-laser beam to the imaging engine.

[0187] Step 1905: The beam splitting module transmits the second sub-laser beam to the phosphor.

[0188] Step 1906: The phosphor acquires fluorescence under excitation of the second sub-laser light, and the phosphor transmits the fluorescence to the imaging engine.

[0189] For a description of the execution process of steps 1901 to 1906 in this embodiment, please refer to the corresponding descriptions of steps 1501 to 1506 in Figure 15. Further details will not be explained again.

[0190] Step 1907: The modulation module receives the projected light beam.

[0191] Step 1908: The modulation module modulates the projected light beam to obtain the modulated light beam and transmits the modulated light beam to the lens assembly.

[0192] Step 1909: The lens assembly images the modulated light beam.

[0193] For a description of the execution process of steps 1907 to 1909 in this embodiment, please refer to one of the embodiments shown in Figure 9, Figure 11, or Figure 12. Further details will not be explained again.

[0194] The present application further provides a vehicle. Figure 20 is a functional block diagram of an embodiment of the vehicle according to the present application. In the embodiment, the vehicle 2000 is configured to be in a fully or partially autonomous driving mode. The vehicle in this embodiment includes a body. The body is configured to house a sensor system 2020, an advanced driving assistance system (ADAS) 2010, peripheral devices 2030, a computer system 2040, projected headlights 2050, and a HUD system 2060.

[0195] The sensor system 2020 includes multiple sensors that sense and detect information about the surrounding environment of the vehicle 2000. For example, the sensor system 2020 may include a positioning system (wherein the positioning system may be the global positioning system (GPS), or the BeiDou system, or another positioning system), an inertial measurement unit (IMU), radar, a laser rangefinder, a camera, and similar. The sensor system 2020 may further include sensors for internal systems of the vehicle 2000 that are being monitored (e.g., an in-vehicle air quality monitor, a fuel gauge, or an oil temperature gauge). Sensor data from one or more of these sensors may be used to detect objects and their corresponding features (position, shape, orientation, velocity, and similar). Such detection and identification are critical functions for the safe operation of the autonomous vehicle 2000. The positioning system may be configured to estimate the geographical location of the vehicle 2000. The IMU is configured to sense changes in the position and orientation of the vehicle 2000 based on inertial acceleration. In some embodiments, the IMU may be a combination of an accelerometer and a gyroscope. Radar may sense objects in the environment surrounding the vehicle 2000 by using radio signals. In some embodiments, in addition to sensing objects, the radar may be configured to sense the velocity and / or direction of movement of objects. The specific type of radar is not limited to the embodiments. For example, the radar may be a millimeter-wave radar, a lidar, or similar. A laser rangefinder may sense objects in the environment in which the vehicle 2000 is located by using laser light. In some embodiments, the laser rangefinder may include one or more laser sources, a laser scanner, one or more detectors, and other system components. A camera may be configured to capture multiple images of the environment surrounding the vehicle 2000. The camera may be a static camera, a video camera, a monocular or binocular camera, or an infrared imager.

[0196] ADAS2010 senses the surrounding environment, collects data, identifies, detects, and tracks static and dynamic objects, and performs system calculations and analyses based on navigation map data at any time while the vehicle is in motion. As a result, the driver can become aware of potential risks in advance, effectively improving driving comfort and vehicle safety. For example, ADAS2010 can control the vehicle by using data acquired by the sensing system 2020. In another example, ADAS2010 can control the vehicle by using head unit data. Head unit data may include key data on the vehicle's instrument panel (fuel consumption, engine speed, temperature, and similar), vehicle speed information, steering wheel angle information, vehicle attitude data, or similar.

[0197] Vehicle 2000 interacts with external sensors, other vehicles, other computer systems, or users through peripheral devices 2030. Peripheral devices 2030 may include a wireless communication system, an on-board computer, a microphone, and / or a speaker. In some embodiments, peripheral devices 2030 provide means for the user of vehicle 2000 to interact with a user interface. For example, an on-board computer may provide information for the user of vehicle 2000. The user interface may further operate the on-board computer to receive input from the user. The on-board computer may be operated via a touchscreen. In another case, peripheral devices 2030 may provide means for vehicle 2000 to communicate with other devices within the vehicle. For example, a microphone may receive voice (e.g., voice commands or other voice input) from the user of vehicle 2000. Similarly, a speaker may output voice to the user of vehicle 2000. The wireless communication system may communicate wirelessly with one or more devices directly or through a communication network.

[0198] Some or all of the functions of vehicle 2000 are controlled by computer system 2040. Computer system 2040 can control the functions of vehicle 2000 based on inputs received from various systems (e.g., sensing system 2020, ADAS 2010, and peripheral devices 2030) and user interfaces. Computer system 2040 may include at least one processor. The processor executes instructions stored in a non-temporary computer-readable medium such as memory. Alternatively, computer system 2040 may be multiple computing devices that control individual components or subsystems of vehicle 2000 in a distributed manner. The type of processor is not limited to the embodiment. For a description of the types of processors, see the above description of the controller included in the light source. Further details will not be described again.

[0199] The processor can acquire vehicle driving-related information from peripheral devices 2030, sensing systems 2020, and / or ADAS 2010, and transmit this information to the projection headlights 2050. See Figure 14 for a description of the projection headlights 2050. Further details will not be provided again. The processor transmits the vehicle driving-related information to the HUD system 2060. See Figure 13 for a description of the HUD system 2060. Further details will not be provided again.

[0200] The embodiments described above are intended solely to illustrate the technical solutions of the present application and are not intended to limit the present application. The present application is described in detail with reference to the embodiments described above, but those skilled in the art will understand that further modifications may be made to the technical solutions described in the embodiments described above, or that some of their technical features may be replaced with equivalent substitutions, without departing from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A light source comprising a first blue light source, a second blue light source, a beam splitting module, and a phosphor, The first blue light source is configured to output a first blue laser beam; The second blue light source is configured to transmit the second blue laser light to the beam splitting module, where the wavelength of the first blue laser light is different from that of the second blue laser light, and the polarization of the first blue laser light is different from that of the second blue laser light; The beam splitting module is configured to: split the second blue laser beam to obtain a first sub-laser beam and a second sub-laser beam, output the first sub-laser beam, and transmit the second sub-laser beam to the phosphor; and The phosphor is configured to acquire fluorescence under excitation of the second sub-laser light and to output the fluorescence; the light source is configured to output a projection light beam, wherein the projection light beam includes the first blue laser light, the first sub-laser light, and the fluorescence. light source.

2. The light source further comprises a controller, the controller being separately connected to the first blue light source and the second blue light source, and the controller being configured to transmit a first light emission signal to the first blue light source and a second light emission signal to the second blue light source; and The first and second light emission signals are used together to adjust the value relationship between the optical power of the first blue laser beam and the optical power of the second blue laser beam, and the value relationship between the optical power of the first blue laser beam and the optical power of the second blue laser beam is related to the chromaticity coordinates of the projected light beam. The light source according to claim 1.

3. The light source according to claim 2, wherein the controller is configured to receive an adjustment command and transmit the first light emission signal to the first blue light source and the second light emission signal to the second blue light source in accordance with the adjustment command.

4. The light source according to any one of claims 1 to 3, wherein the polarization of the first blue laser light is perpendicular to the polarization of the second blue laser light.

5. In a process in which the light source further comprises a polarizing beam combiner module, the first blue light source is configured to output a first blue laser beam, and the beam splitting module is configured to output a first sub-laser beam, the first blue light source is configured to transmit the first blue laser beam to the polarizing beam combiner module, and the beam splitting module is configured to transmit the first sub-laser beam to the polarizing beam combiner module; and The polarized beam combiner module is configured to output the first blue laser light and the first sub-laser light, respectively, based on the polarization of the first blue laser light and the polarization of the first sub-laser light. The light source according to any one of claims 1 to 4.

6. The polarized beam combiner module is configured to transmit and output the first blue laser light based on the polarization of the first blue laser light, and the polarized beam combiner module is configured to reflect and output the first sub-laser light based on the polarization of the first sub-laser light; or The polarized beam combiner module is configured to reflect and output the first blue laser light based on the polarization of the first blue laser light, and the polarized beam combiner module is configured to transmit and output the first sub-laser light transparently based on the polarization of the first sub-laser light. The light source according to claim 5.

7. The light source according to any one of claims 1 to 6, further comprising a red light source, the red light source being configured to output red laser light, and the projection light beam further comprising the red laser light.

8. The light source according to any one of claims 1 to 6, further comprising a red light source and a green light source, wherein the red light source is configured to output red laser light, the green light source is configured to output green laser light, and the projection light beam further includes the green laser light and the red laser light.

9. The light source according to any one of claims 1 to 8, further comprising a beam combiner module, the beam combiner module configured to combine the first blue laser light, the first sub-laser light, and the fluorescence to obtain the projection light beam.

10. The light source further comprises a color filter wheel, the color filter wheel configured to filter a blue projection beam, a red projection beam, and a green projection beam from the projection beam over different periods, wherein the blue projection beam includes the first blue laser light and the first sub-laser light, according to any one of claims 1 to 8.

11. A projection system comprising a light source and an imaging engine, wherein the imaging engine includes a modulation module and a lens assembly, and the light source is as described in any one of claims 1 to 10; The modulation module is configured to receive the projected light beam from the light source; The modulation module is configured to modulate the projected light beam to obtain a modulated light beam and to transmit the modulated light beam to the lens assembly; and The lens assembly is configured to image the modulated light beam. A projection system.

12. The imaging engine further includes a color filter module and a focusing module, the modulation module includes a blue image modulation module, a red image modulation module and a green image modulation module, and the color filter module is: The projection beam is split to obtain a blue projection beam, a red projection beam, and a green projection beam; The blue projected light beam is transmitted to the blue image modulation module; The red projected light beam is transmitted to the red image modulation module; and The green projection light beam is transmitted to the green image modulation module. It is structured in such a way; The blue image modulation module is configured to modulate the blue projection light beam to obtain a modulated blue light beam; the red image modulation module is configured to modulate the red projection light beam to obtain a modulated red light beam; and the green image modulation module is configured to modulate the green projection light beam to obtain a modulated green light beam; and The focusing module is configured to: focus the modulated blue light beam, the modulated red light beam, and the modulated green light beam to obtain the modulated light beam, and transmit the modulated light beam to the lens assembly. The projection system according to claim 11.

13. The imaging engine further includes a color filter wheel, the color filter wheel being: During the first period, the projected light beam is split to obtain a blue projected light beam, and the blue projected light beam is transmitted to the modulation module; In the second period, the projected light beam is split to obtain a red projected light beam, and the red projected light beam is transmitted to the modulation module; and In the third period, the projection light beam is split to obtain a green projection light beam, and the green projection light beam is transmitted to the modulation module. It is configured such that any two of the first period, the second period, and the third period are different. The projection system according to claim 11.

14. A projection method applied to a projection system, wherein the projection system comprises a light source and an imaging engine, the light source includes a first blue light source, a second blue light source, a beam splitting module, and a phosphor, the imaging engine includes a modulation module and a lens assembly, and the method is: The first step is to transmit the first blue laser light to the modulation module using the first blue light source; In the step of transmitting the second blue laser light to the beam splitting module using the second blue light source, the wavelength of the first blue laser light is different from the wavelength of the second blue laser light, and the polarization of the first blue laser light is different from the polarization of the second blue laser light; The beam splitting module splits the second blue laser beam to obtain a first sub-laser beam and a second sub-laser beam, and transmits the first sub-laser beam to the modulation module and the second sub-laser beam to the phosphor; The step involves transmitting fluorescence to the modulation module using the phosphor, where the fluorescence is acquired when the phosphor is excited by the second sub-laser light; The modulation module modulates the projection light beam to obtain a modulated light beam, and transmits the modulated light beam to the lens assembly, wherein the projection light beam includes the first blue laser light, the first sub-laser light, and the fluorescence; and The step of imaging the modulated light beam with the lens assembly. A method that includes [a certain feature].

15. The light source further includes a controller, and before transmitting the first blue laser light to the modulation module by the first blue light source and the second blue laser light to the beam splitting module by the second blue light source, the method further: The controller transmits the first light emission signal to the first blue light source and the second light emission signal to the second blue light source. The projection method according to claim 14, wherein the first light emission signal and the second light emission signal are used together to adjust the value relationship between the optical power of the first blue laser light and the optical power of the second blue laser light, and the value relationship between the optical power of the first blue laser light and the optical power of the second blue laser light is related to the chromaticity coordinates of the projected light beam.

16. The light source further includes a polarizing beam combiner module, and the steps of transmitting the first blue laser light to the modulation module by the first blue light source and the first sub-laser light to the modulation module by the beam splitting module are as follows: A step of transmitting the first blue laser light to the polarized beam combiner module using the first blue light source; The steps include: transmitting the first sub-laser light to the polarized beam combiner module using the beam splitting module; and The polarized beam combiner module transmits the first blue laser light and the first sub-laser light separately to the modulation module based on the polarization of the first blue laser light and the polarization of the first sub-laser light. The projection method according to claim 14 or 15, including the method described in claim 14 or 15.

17. A head-up display system comprising a light deflection module and a projection system according to any one of claims 11 to 13, The projection system is configured to transmit the modulated light beam to the optical deflection module; The optical deflection module is configured to transmit the amplified modulated light beam to the windshield, and the modulated light beam forms a virtual image through the windshield. Head-up display system.

18. A projection headlight comprising an imaging engine and a light source according to any one of claims 1 to 10, The light source is configured to transmit the projection light beam to the imaging engine; The imaging engine is configured to modulate the projection light beam to acquire a modulated light beam, the modulated light beam is irradiated onto the road surface to form a target light pattern, and the target light pattern indicates vehicle driving-related information. Projection headlights.

19. A vehicle comprising a body, a windshield, and a processor, wherein the body is configured to fix the windshield and the processor, and the vehicle further comprises a head-up display system according to claim 17 or a projection headlight according to claim 18; The processor is configured to transmit vehicle driving-related information to the imaging engine; and The imaging engine is configured to modulate the vehicle driving-related information into the projection light beam and acquire the modulated light beam. Vehicle body.

20. Augmented reality (AR) glasses comprising a frame, lenses, a modulation module, and a light source according to any one of claims 1 to 10, wherein the frame is configured to fix the lenses, the light source, and the modulation module; The light source is configured to transmit the projected light beam to the modulation module; The modulation module is configured to: modulate the projection light beam to obtain a modulated light beam, and transmit the modulated light beam to the lens; and The lens is configured to project the modulated light beam. AR glasses.

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