Projection light core, projection system and related equipment

Abstract

The invention discloses a projection light nucleus, a projection system and related equipment, which can reduce the light path length of the projection light nucleus, further reduce the volume of the projection light nucleus and improve the integration level of the projection light nucleus. The projection light core comprises a light splitting assembly, a reflector group and an image modulation module, the light splitting assembly comprises a first dichroscope and a second dichroscope, and the first dichroscope and the second dichroscope intersect. The light splitting assembly is used for splitting an input beam to obtain a projection beam. The projection beams comprise a blue beam, a green beam and a red beam; the reflector group is used for reflecting the projection light beam to the image modulation module, the light splitting assembly intersects at a reference plane, a first angle is formed between the transmission direction of the input light beam and the reference plane, and a second angle is formed between the transmission direction of the projection light beam emitted from the reflector group and the reference plane; the absolute value of the first angle is smaller than that of the second angle; the image modulation module is used for modulating the projection beam to obtain an imaging beam.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of light display technology, and in particular to a projection light core, a projection system, and related equipment. Background Art

[0002] As society enters the multimedia information age, the types of information have changed from single digital text to multimedia forms dominated by images and sounds. The projection system can realize multimedia display. The structure of the projection system can be seen in Figure 1 As shown, Figure 1 The diagram is a structural example of an existing projection system.

[0003] In the existing projection system, the white light 101 emitted by the light source is transmitted to the dichroic mirror 102, and the dichroic mirror 102 splits the white light into a mixed light beam 103 and a green light beam 104. The reflector 105 reflects the green light beam 104 to the light combining module 106. The mixed light beam 103 is transmitted to the dichroic mirror 107, and the dichroic mirror 107 splits the mixed light beam 103 into a red light beam 108 and a blue light beam 109. The red light beam 108 and the blue light beam 109 are transmitted to the light combining module 106. The light combining module 106 combines the green light beam 104, the red light beam 108 and the blue light beam 109 into a projection light beam, and transmits it to the lens to project an image.

[0004] However, the existing projection system has a complex optical path, which increases the size of the projection system and cannot meet the demand for miniaturization of the projection system. Summary of the invention

[0005] The embodiments of the present application provide a projection light core, a projection system, and related equipment, which can reduce the optical path length of the projection light core, thereby reducing the volume of the projection light core and improving the integration of the projection light core.

[0006] In the first aspect, the embodiment of the present application provides a projection light core, including a beam splitter component, a reflector group and an image modulation module, the beam splitter component includes a first dichroic mirror and a second dichroic mirror, and the first dichroic mirror and the second dichroic mirror intersect, and the intersection of the first dichroic mirror and the second dichroic mirror means that there is an intersection point between the first dichroic mirror and the second dichroic mirror or the first dichroic mirror and the second dichroic mirror are in a cross position relationship. For example, the first dichroic mirror intersects with the second dichroic mirror and is perpendicular to each other. The beam splitter component is used to split the input light beam to obtain a projection light beam, and transmit the projection light beam to the reflector group, the projection light beam includes a blue light beam, a green light beam and a red light beam; the reflector group is used to reflect the projection light beam to the image modulation module, and the beam splitter component intersects at a reference plane, for example, the beam splitter component is perpendicular to the reference plane. There is a first angle between the transmission direction of the input light beam and the reference plane, there is a second angle between the transmission direction of the projection light beam emitted from the reflector group and the reference plane, and the absolute value of the first angle is smaller than the absolute value of the second angle; the image modulation module is used to modulate the projection light beam to obtain an imaging light beam, and the imaging light beam is used for projection imaging.

[0007] The projection light core shown in this aspect is used, and the light splitting component is used as an optical device to split the entire light beam once, so that the light splitting component outputs monochromatic light beams respectively. Because the projection light core only needs one optical device, the light splitting component, to split the light beam, there is no need to use another optical device to split the light beam, thereby reducing the length of the optical path between the input light beam emitted by the light source and the imaging light beam. When the absolute value of the first angle is less than the absolute value of the second angle, the volume of the projection light core is effectively reduced, and the integration of the projection light core is improved.

[0008] Based on the first aspect, in an optional implementation, a transmission direction of the imaging light beam is opposite to a transmission direction of the input light beam.

[0009] By adopting this implementation, when the transmission direction of the imaging light beam is opposite to the transmission direction of the input light beam, the volume of the projection light core is effectively reduced and the integration of the projection light core is improved.

[0010] Based on the first aspect, in an optional implementation, the absolute value of the second angle is not less than 75 degrees and not greater than 105 degrees.

[0011] This implementation method effectively ensures that the blue light beam, green light beam and red light beam emitted by the reflector group can be successfully transmitted to the image modulation module, thereby ensuring the success rate of projection imaging. Moreover, the volume of the projection light core is reduced, and the integration of the projection light core is improved.

[0012] Based on the first aspect, in an optional implementation, if the image modulation module is located above the reference plane along the direction of gravity, the projection light beam emitted from the reflector group is deflected in a counterclockwise direction relative to the reference plane.

[0013] By adopting this implementation method, if the position of the image modulation module is adjusted to be above the reference plane along the direction of gravity, the projection light beam emitted from the reflector group is deflected in a counterclockwise direction relative to the reference plane, thereby effectively reducing the volume of the projection light core and improving the integration of the projection light core.

[0014] Based on the first aspect, in an optional implementation, the spectroscopic component includes a first output module, a second output module and a third output module, the first output module is used to output the blue light beam, the second output module is used to output the green light beam, and the third output module is used to output the red light beam.

[0015] As shown in the present aspect, the spectrometer component is used as an optical device to split the entire light beam once, so as to obtain a blue light beam, a green light beam and a red light beam output from the first output module, the second output module and the third output module respectively, thereby achieving the purpose of using the spectrometer component as an optical device to split the entire light beam once to obtain three monochromatic light beams.

[0016] Based on the first aspect, in an optional implementation, the first dichroic mirror includes a first sub-mirror and a second sub-mirror, the second dichroic mirror includes a third sub-mirror and a fourth sub-mirror, and the first output module includes the third sub-mirror and the fourth sub-mirror; the first sub-mirror is used to receive the light beam, and split the light beam to obtain a first mixed light beam, and the first sub-mirror is used to transmit the first mixed light beam to the third sub-mirror; the third sub-mirror is used to split the first mixed light beam to obtain one blue light beam, and the third sub-mirror is used to reflect the one blue light beam; the fourth sub-mirror is used to receive the light beam, and split the light beam to obtain another blue light beam, and the fourth sub-mirror is used to reflect the other blue light beam.

[0017] By using the present invention, the splitter component is used as an optical device to split the entire light beam once, so as to obtain a blue light beam output from the first output module, thereby reducing the length of the optical path between the light beam emitted by the light source and the blue light beam, reducing the volume of the projection light core, and improving the integration of the projection light core.

[0018] Based on the first aspect, in an optional implementation, the first dichroic mirror includes a first sub-mirror and a second sub-mirror, the second dichroic mirror includes a third sub-mirror and a fourth sub-mirror, and the second output module includes the second sub-mirror and the third sub-mirror; the first sub-mirror is used to receive the light beam, and split the light beam to obtain a first mixed light beam, and the first sub-mirror is used to transmit the first mixed light beam to the third sub-mirror; the third sub-mirror is used to split the first mixed light beam to obtain a green light beam, and the third sub-mirror is used to transmit the green light beam; the fourth sub-mirror is used to receive the light beam, and split the light beam to obtain a second mixed light beam, and the fourth sub-mirror is used to transmit the second mixed light beam to the second sub-mirror, the second sub-mirror is used to split the second mixed light beam to obtain another green light beam, and the second sub-mirror is used to transmit the other green light beam.

[0019] By using the present invention, the splitter component is used as an optical device to split the entire light beam once, so as to obtain a green light beam output from the second output module, thereby reducing the length of the optical path between the light beam emitted by the light source and the green light beam, reducing the volume of the projection light core, and improving the integration of the projection light core.

[0020] Based on the first aspect, in an optional implementation, the first dichroic mirror includes a first sub-mirror and a second sub-mirror, the second dichroic mirror includes a third sub-mirror and a fourth sub-mirror, and the third output module includes the first sub-mirror and the second sub-mirror; the first sub-mirror is used to receive the light beam, and split the light beam to obtain one red light beam, and the first sub-mirror is used to reflect the one red light beam; the fourth sub-mirror is used to receive the light beam, and split the light beam to obtain a second mixed light beam, the fourth sub-mirror is used to transmit the second mixed light beam to the second sub-mirror, the second sub-mirror is used to split the second mixed light beam to obtain another red light beam, and the second sub-mirror is used to reflect the other red light beam.

[0021] By using the present invention, the splitter component is used as an optical device to split the entire light beam once, so as to obtain a red light beam output from the second output module, thereby reducing the length of the optical path between the light beam emitted by the light source and the red light beam, reducing the volume of the projection light core, and improving the integration of the projection light core.

[0022] Based on the first aspect, in an optional implementation, the projection light core also includes a first polarization conversion module, and the projection light core also includes a first polarization conversion module, and the first polarization conversion module is used to convert the light beam into the input light beam, and the input light beam includes linearly polarized light.

[0023] According to the present aspect, when the input light beam emitted by the first polarization conversion module includes linearly polarized light, the imaging efficiency and imaging contrast can be effectively improved.

[0024] Based on the first aspect, in an optional implementation, the transmission optical path of the blue light beam emitted by the spectroscopic component includes a second polarization conversion module, and the second polarization conversion module is used to convert the blue light beam into a purified blue light beam, and the purified blue light beam includes linear polarized light; the transmission optical path of the green light beam emitted by the spectroscopic component includes a third polarization conversion module, and the third polarization conversion module is used to convert the green light beam into a purified green light beam, and the purified green light beam includes linear polarized light; the transmission optical path of the red light beam emitted by the spectroscopic component includes a fourth polarization conversion module, and the fourth polarization conversion module is used to convert the red light beam into a purified red light beam, and the purified red light beam includes linear polarized light, and the projection light beam includes the purified blue light beam, the purified green light beam and the purified red light beam.

[0025] By adopting the present aspect, through the second polarization conversion module, the third polarization conversion module and the fourth polarization conversion module, it is possible to ensure that the linear polarization state purity of the purified blue light beam, the purified green light beam and the purified red light beam transmitted to the first image modulation module, the second image modulation module and the third image module is improved, thereby improving the contrast of the imaging based on the purified blue light beam, the purified green light beam and the purified red light beam.

[0026] Based on the first aspect, in an optional implementation, the projection light core further includes a light homogenizer, which is used to homogenize the light beam to obtain the homogenized input light beam. The light homogenizer is a fly-eye lens, a free-form surface lens, or a light homogenizer rod.

[0027] By adopting the light homogenizing device shown in this aspect, the imaging efficiency can be effectively improved.

[0028] Based on the first aspect, in an optional implementation, the image modulation module includes a first image modulation module, a second image modulation module, a third image modulation module and a light combining module: the first image modulation module is used to modulate the blue light beam to obtain a first modulated light beam; the second image modulation module is used to modulate the green light beam to obtain a second modulated light beam; the third image modulation module is used to modulate the red light beam to obtain a third modulated light beam; the light combining module is used to combine the first modulated light beam, the second modulated light beam and the third modulated light beam to obtain the imaging light beam.

[0029] As shown in this aspect, the projection light core is applied to the three-chip projection system, which effectively improves the clarity of the projection image.

[0030] Based on the first aspect, in an optional implementation, the projection light core also includes a filter color wheel, which is used to: split the projection light beam in a first time period to obtain a blue projection light beam, and transmit the blue projection light beam to the modulation module; split the projection light beam in a second time period to obtain a red projection light beam, and transmit the red projection light beam to the modulation module; split the projection light beam in a third time period to obtain a green projection light beam, and transmit the green projection light beam to the modulation module, wherein the intersection of any two time periods among the first time period, the second time period and the third time period on the time axis is empty.

[0031] By adopting the method shown in the present invention, the projection optical core is applied to the single-chip projection system, which effectively reduces the cost of projection imaging.

[0032] In a second aspect, an embodiment of the present application provides a projection system, the projection system comprising a light source, a lens, and a projection light core as described in any one of the first aspects above; the projection light core is used to receive the input light beam from the light source; the lens is used to receive the imaging light beam from the projection light core, and project the imaging light beam into an image. For the description of the beneficial effects of this aspect, please refer to the first aspect, and the specific details will not be repeated.

[0033] In a third aspect, an embodiment of the present application provides a head-up display system, comprising a light deflection module and a projection system as described in the second aspect; the projection system is used to transmit the imaging light beam to the light deflection module; the light deflection module is used to transmit the amplified imaging light beam to a windshield, and the imaging light beam forms a virtual image through the windshield.

[0034] In a fourth aspect, an embodiment of the present application provides a vehicle, comprising a vehicle body, a windshield, and a processor, wherein the vehicle body is used to fix the windshield and the processor, and the vehicle further comprises a head-up display system as shown in the third aspect. The processor is used to transmit vehicle driving related information to the image modulation module; the image modulation module is used to modulate the vehicle driving related information on the projection beam to obtain the imaging beam.

[0035] In a fifth aspect, an embodiment of the present application provides a vehicle lamp, comprising a fixing base and a projection system as described in any one of the second aspects, wherein the fixing base is used to fix the projection system on a vehicle.

[0036] In the sixth aspect, an embodiment of the present application provides a vehicle, comprising a vehicle body and a processor, the vehicle body being used to fix the processor, and the vehicle also comprising a headlight as shown in the fifth aspect; the processor being used to transmit vehicle driving related information to the image modulation module; the image modulation module being used to modulate the vehicle driving related information on the projection beam to obtain the imaging beam.

[0037] In the seventh aspect, an embodiment of the present application provides a pair of smart glasses, comprising a frame, a lens, a light source, and a projection light core as described in any one of the first aspects, wherein the frame is used to fix the lens, the light source, and the projection light core; the projection light core is used to receive the input light beam from the light source; the lens is used to receive the imaging light beam from the projection light core and project the imaging light beam into an image. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a structural example diagram of an existing projection system;

[0039] Figure 2a An example diagram of the overall structure of the first embodiment of the projection system provided in this application;

[0040] Figure 2b for Figure 2a An example diagram of a top-down optical path of a projection system shown;

[0041] Figure 3 for Figure 2a The structure example diagram of the projection light core shown;

[0042] Figure 4a for Figure 2a A partial structural example diagram of the projection system shown;

[0043] Figure 4b for Figure 2a The structure example diagram of the light splitting component shown;

[0044] Figure 5a for Figure 4b An example diagram of a transmission spectrum of the first dichroic mirror shown;

[0045] Figure 5b for Figure 4b An example diagram of a reflection spectrum of the first dichroic mirror shown;

[0046] Figure 6a for Figure 2a An example modulation diagram of the first image modulation module shown;

[0047] Figure 6b for Figure 2a Another modulation example diagram of the first image modulation module shown;

[0048] Figure 7 An example diagram of the overall structure of a second embodiment of the projection system provided in this application;

[0049] Figure 8a for Figure 7 An example modulation diagram of the first image modulation module shown;

[0050] Figure 8b for Figure 7 Another modulation example diagram of the first image modulation module shown;

[0051] Fig. 9 An overall structural example diagram of a third embodiment of the projection system provided in this application;

[0052] Fig.10 An example diagram of the structure of an embodiment of the head-up display system provided in this application;

[0053] Fig.11 An example diagram of the structure of an embodiment of the projection vehicle lamp provided in this application;

[0054] Fig.12 A functional block diagram of an embodiment of a vehicle provided in the present application. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0056] The embodiment of the present application provides a projection system. The projection system shown in the embodiment can be applied to portable display devices (such as projection mobile phones), home theaters, commercial projections (such as light shows, concerts), outdoor projections, conference presentations, classroom presentations, movie screenings, smart gesture interactive projections, smart home smart walls, head up displays (head up display, HUD), augmented reality head up display systems (augmented reality-head up display, AR-HUD), AR glasses and virtual reality technology (virtual reality, VR) glasses, etc., without specific limitation.

[0057] Figure 2a This is an example diagram of the overall structure of the first embodiment of the projection system provided in this application. Figure 2b for Figure 2a An example diagram of the optical path of a projection system from a top view is shown. Figure 3 for Figure 2a The projection system shown in this embodiment includes a light source 201, a projection light core 400 and a lens 270. The projection light core 400 includes a light splitting component 206, a reflector group, a first image modulation module 254a, a second image modulation module 254b and a third image modulation module 254c and a light combining module 260.

[0058] The light source 201 shown in this embodiment is used to emit an input light beam 301. The input light beam 301 is white light, which can also be called white light, achromatic light or colorless light. The input light beam 301 is the result of mixing multiple colored lights in a certain proportion. The light source 201 can be an incandescent lamp (for example, a halogen tungsten lamp), a gas discharge lamp (for example, a high-pressure mercury lamp and a xenon lamp), a metal halide lamp, a fluorescent lamp, a laser array, or a transmitter based on a light-emitting diode (LED). The laser array may include one or more lasers, and the laser may be a laser diode (LD), a vertical cavity surface emitting laser (VCSEL) or a Fabry-Perot laser, etc. Optionally, the projection light core 400 may include a light homogenizing device, which is located on the transmission light path of the input light beam 301 emitted from the light source 201 to ensure that the light homogenizing device can successfully receive the input light beam 301 emitted by the light source 201. The light homogenizing device is used to perform light homogenization on the input light beam 301 to output the light beam 302 after the light homogenization. The light homogenizing device shown in this embodiment may be a fly-eye lens, a free-form surface lens, or a light homogenizing rod, etc. In this embodiment, the light homogenizing device includes two fly-eye lenses, namely a first fly-eye lens 202 and a second fly-eye lens 203 as an example. The first fly-eye lens 202 and the second fly-eye lens 203 perform light homogenization on the input light beam 301 in turn to emit the input light beam 302 after the light homogenization. Optionally, the first fly-eye lens 202 and the second fly-eye lens 203 shown in this embodiment may also be two sides of a light homogenizing lens. The description of the light homogenizing device in this embodiment is an optional example and is not limited.

[0059] Optionally, the projection light core 400 shown in this embodiment also includes a first polarization conversion module 204, and the first polarization conversion module 204 is located on the transmission optical path of the light beam 302 after the uniform light treatment. Because the image modulation module needs to modulate the linearly polarized light, it is necessary to ensure that the light beam transmitted to the image modulation module includes linearly polarized light. The first polarization conversion module 204 shown in this embodiment is located between the uniform light device and the light splitting component 206, and the first polarization conversion module 204 converts the light beam 302 after the uniform light treatment into a polarization purified light beam 303, and the polarization purified light beam 303 includes linearly polarized light. It can be understood that, as shown in this embodiment, the proportion of linearly polarized light in the polarization purified light beam 303 is increased by the first polarization conversion module 204. For example, the proportion of linearly polarized light in the light beam 302 after the uniform light treatment is 50%, and after purification by the first polarization conversion module 204, the proportion of linearly polarized light in the polarization purified light beam 303 is increased to 95%. In the case where the light beam 303 includes linearly polarized light, the imaging efficiency and imaging contrast can be effectively improved. The first polarization conversion module 204 may be a polarization conversion system (PCS), etc. For example, the first polarization conversion module 204 includes a polarization beam splitter and a half glass slide. The first polarization conversion module 204 shown in this embodiment is an optional device. For example, if the input light beam 301 emitted by the light source 201 is a laser beam, the first polarization conversion module 204 may not be provided because the laser beam itself is already linearly polarized light.

[0060] Optionally, the projection optical core 400 shown in this embodiment further includes a first lens group 205, and the first lens group 205 is located on the transmission optical path of the polarization-purified light beam 303 emitted from the first polarization conversion module 204. And the first lens group 205 is located between the first polarization conversion module 204 and the light splitting component 206. The first lens group 205 is used to converge the polarization-purified light beam 303 emitted from the first polarization conversion module 204 to the light splitting component 206. Specifically, the first lens group 205 is used to converge the light beam 303 to emit a converged light beam 304, and the light splitting component 206 is located on the transmission optical path of the converged light beam 304. The first lens group 205 includes one or more lenses, and the number of lenses included in the first lens group 205 is not limited in this embodiment.

[0061] The light splitting component 206 is used to split the light beam 304 to obtain a blue light beam 305a, a green light beam 305b and a red light beam 305c. Specifically, the light splitting component 206 shown in this embodiment has a first output module 212, a second output module 213 and a third output module 214. The light splitting component 206 receives the light beam 304, and the light splitting component 206, as a whole, splits the light beam once to obtain a blue light beam 305a, a green light beam 305b and a red light beam 305c. The light splitting component 206 outputs the blue light beam 305a through the first output module 212, outputs the green light beam 305b through the second output module 213, and outputs the red light beam 305c through the third output module 214. It can be understood that each output module of the light splitting component 206 shown in this embodiment can generate a monochromatic light beam. In this embodiment, the light splitting component 206, as a whole, splits the light beam 304 once, and can obtain three monochromatic light beams at one time, that is, the blue light beam 305a, the green light beam 305b and the red light beam 305c. The specific structure of the light splitting component 206 is described below:

[0062] Figure 4b for Figure 2aThe structure example diagram of the light splitting component shown. The light splitting component 206 shown in this embodiment includes a first dichroic mirror 401 and a second dichroic mirror 402. The dichroic mirror shown in this embodiment can also be called a dichroic beam splitter or a dichroic mirror, etc., and is not specifically limited. Among them, the first dichroic mirror 401 and the second dichroic mirror 402 intersect. The intersection of the first dichroic mirror 401 and the second dichroic mirror 402 means that there is an intersection between the first dichroic mirror 401 and the second dichroic mirror 402 or the first dichroic mirror 401 and the second dichroic mirror 402 are in a cross position relationship. For example, the first dichroic mirror intersects with the second dichroic mirror and is perpendicular to each other. In this embodiment, the second dichroic mirror 402 is a complete structure, and the first dichroic mirror 401 includes two sub-mirrors separated in position as an example, that is, the first dichroic mirror 401 includes a first sub-mirror 411 and a second sub-mirror 412, and there is a gap between the first sub-mirror 411 and the second sub-mirror 412. The first dichroic mirror 401 passes through the gap between the first sub-mirror 411 and the second sub-mirror 412 to ensure that the first dichroic mirror 401 and the second dichroic mirror 402 intersect. This embodiment does not limit the angle at which the first dichroic mirror 401 and the second dichroic mirror 402 intersect, for example, the first dichroic mirror 401 and the second dichroic mirror 402 intersect and are perpendicular to each other. Specifically, the second dichroic mirror includes a third sub-mirror 421 and a fourth sub-mirror 422. It can be understood that when the first dichroic mirror 401 and the second dichroic mirror 402 intersect and are perpendicular to each other, the angle between the first sub-mirror 411 and the third sub-mirror 421, the angle between the first sub-mirror 411 and the fourth sub-mirror 422, the angle between the second sub-mirror 412 and the third sub-mirror 421, and the angle between the second sub-mirror 412 and the fourth sub-mirror 422 are all right angles. It should be clear that the description of the structure of the light splitting component 206 in this embodiment is an optional example and is not limited. For example, the first dichroic mirror 401 is a complete structure, and there is a gap between the third sub-mirror 421 and the fourth sub-mirror 422, and the first dichroic mirror 401 passes through the gap between the third sub-mirror 421 and the fourth sub-mirror 422. For another example, the first dichroic mirror 401 includes a first sub-mirror 411 and a second sub-mirror 412 separated by two positions, and the second dichroic mirror 402 includes a third sub-mirror 421 and a fourth sub-mirror 422 separated by two positions. This embodiment does not limit the structure of the first dichroic mirror 401 and the second dichroic mirror 402, as long as the first dichroic mirror 401 and the second dichroic mirror 402 are in an intersecting position relationship.

[0063] The first sub-mirror 411 receives the light beam 304 and splits the light beam 304 to obtain a red light beam 305c and a first mixed light beam 432. In this embodiment, the first mixed light beam 432 is taken as an example as a cyan light beam mixed with a green light beam and a blue light beam. Figure 5a for Figure 4bAn example of a transmission spectrum of the first dichroic mirror is shown. Figure 5a The horizontal axis of the transmission spectrum shown is wavelength, in nanometers (nm). The vertical axis is the transmittance corresponding to each wavelength. As shown above, the light beam 304 is white light, so the light beam 304 is a mixture of a red light beam, a blue light beam and a green light beam, the central wavelength of the blue light beam is 465nm, the central wavelength of the green light beam is 550nm, and the central wavelength of the red light beam is 640nm. It should be clear that this embodiment does not limit the central wavelengths of the red light beam, the blue light beam and the green light beam. In the spectrum, the wavelength band where the blue light beam is located, the wavelength band where the green light beam is located and the wavelength band where the red light beam is located increase in sequence. Figure 5a In the transmission spectrum shown, the transmittance corresponding to the blue light beam is close to 1, so the blue light beam in the light beam 304 is transmitted from the first sub-mirror 411, and the transmittance corresponding to the green light beam is also close to 1, so the green light beam in the light beam 304 is transmitted from the first sub-mirror 411. It can be understood that the first sub-mirror 411 is based on Figure 5a The transmission spectrum shown enables a first mixed light beam 432 to be transmitted from the first sub-mirror 411. The first mixed light beam 432 is a cyan light beam. The cyan light beam includes a green light beam and a blue light beam that are transmitted from the first sub-mirror 411 and are in a mixed state. Figure 5b for Figure 4b An example graph of a reflection spectrum of the first dichroic mirror is shown. Figure 5b The horizontal axis of the reflection spectrum shown is the wavelength, and the vertical axis is the reflectivity corresponding to each wavelength. Figure 5a as well as Figure 5b As shown, the blue light beam and the green light beam are Figure 5a The corresponding transmittances are close to 1. Figure 5b The corresponding reflectivity in is 0. Then, the blue light beam and the green light beam are only transmitted from the first sub-mirror 411. Figure 5a The corresponding transmittance is 0. Figure 5b The corresponding reflectivity is 1. Then, the red light beam is reflected only from the first sub-mirror 411. It can be understood that one red light beam 305c is reflected from the first sub-mirror 411. The first mixed light beam 432 transmitted from the first sub-mirror 411 is transmitted to the third sub-mirror 421, and the third sub-mirror 421 splits the first mixed light beam 432 to obtain one blue light beam 305a and one green light beam 305b. The blue light beam 305a is reflected from the third sub-mirror 421, and the green light beam 305b is transmitted from the third sub-mirror 421. For the description of the transmission spectrum and reflection spectrum of the third sub-mirror 421 in this embodiment, please refer to the description of the transmission spectrum and reflection spectrum of the first sub-mirror 411, and no further details are given, as long as the blue light beam 305a is reflected from the third sub-mirror 421 and the green light beam 305b is transmitted from the third sub-mirror 421.

[0064] The fourth sub-mirror 422 receives the light beam 304, and splits the light beam 304 to obtain another blue light beam 305a and a second mixed light beam 436. Moreover, the blue light beam 305a is reflected from the fourth sub-mirror 422, and the second mixed light beam 436 is transmitted from the fourth sub-mirror 422 and transmitted to the second sub-mirror 412. The second mixed light beam 436 shown in this embodiment is yellow light, which is a mixture of a red light beam and a green light beam. For the description of the transmission spectrum and the reflection spectrum of the fourth sub-mirror 422 in this embodiment, please refer to the description of the transmission spectrum and the reflection spectrum of the first sub-mirror 411, and the specific details are not repeated. As long as the blue light beam 305a is reflected from the fourth sub-mirror 422, the second mixed light beam 436 is transmitted from the fourth sub-mirror 422. When the second sub-mirror 412 receives the second mixed light beam 436, it splits the second mixed light beam 436 to obtain another green light beam 305b and another red light beam 305c. For the description of the transmission spectrum and reflection spectrum of the second sub-mirror 412 in this embodiment, please refer to the description of the transmission spectrum and reflection spectrum of the first sub-mirror 411. The details are not repeated here. It is sufficient as long as the green light beam 305b is transmitted from the second sub-mirror 412 and the red light beam 305c is reflected from the second sub-mirror 412.

[0065] Combination Figure 2b and Figure 4b As shown, the first output module 212 of the light splitting component 206 includes the third sub-mirror 421 and the fourth sub-mirror 422, and the first output module is used to output the blue light beam 305a. It should be clear that if the first sub-mirror 411 is located on the transmission light path of the blue light beam 305a, then the first sub-mirror 411 can make the blue light beam 305a transmit from the first sub-mirror 411 based on the transmission spectrum. The second output module 213 of the light splitting component 206 includes the third sub-mirror 421 and the second sub-mirror 412, and the second output module 213 is used to output the green light beam 305b. The third output module 214 includes the first sub-mirror 411 and the second sub-mirror 412, and the third output module is used to output the red light beam 305c. It should be clear that if the fourth sub-mirror 422 is located on the transmission light path of the red light beam 305c, then the fourth sub-mirror 422 can make the red light beam 305c transmit from the fourth sub-mirror 422 based on the transmission spectrum. The description of the splitting light path of the splitting component 206 in this embodiment is an optional example and is not limited. For example, the red light beam in the light beam 304 is emitted via the fourth sub-mirror 422 and the third sub-mirror 421 in sequence, and the blue light beam in the light beam 304 is emitted via the first sub-mirror 411 and the second sub-mirror 412 in sequence, that is, the light path for transmitting the red light beam and the light path for transmitting the blue light beam in the splitting component 306 can be swapped.

[0066] The reflector group specifically includes a first reflector 251a, a second reflector 251b and a third reflector 251c. The first reflector 251a is located on the transmission optical path of the blue light beam 305a, and the first reflector 251a is used to reflect the blue light beam 305a to the first image modulation module 254a. The second reflector 251b is located on the transmission optical path of the green light beam 305b, and the second reflector 251b is used to reflect the green light beam 305b to the second image modulation module 254b. The third reflector 251c is located on the transmission optical path of the red light beam 305c, and the third reflector 251c is used to reflect the red light beam 305c to the third image modulation module 254c. That is, the first reflector 251a, the second reflector 251b and the third reflector 251c shown in this embodiment are used to adjust the transmission direction of the blue light beam 305a, the green light beam 305b and the red light beam 305c, so as to ensure that the blue light beam 305a, the green light beam 305b and the red light beam 305c can be successfully transmitted to the first image modulation module 254a, the second image modulation module 254b and the third image modulation module 254c respectively, and the blue light beam 305a, the green light beam 305b and the red light beam 305c emitted from the first reflector 251a, the second reflector 251b and the third reflector 251c are defined as projection beams in this embodiment of the application. The transmission direction of the input light beam 301 and the transmission direction of the projection light beam are described below:

[0067] like Figure 4aAs shown, the light source 201 and the light splitting component 206 intersect at the reference plane 280. For example, preferably, the light source 201 and the light splitting component 206 are respectively perpendicular to the reference plane 280. It should be clear that the present embodiment does not limit the angle of intersection between the light source 201 and the light splitting component 206 and the reference plane 280. The angle between the transmission direction of the input light beam 301 emitted from the light source 201 and the reference plane 280 is the first angle. In the projection light beam, taking the blue light beam 305a as an example, the angle between the transmission direction of the blue light beam 305a emitted from the first reflector 251a and the reference plane 280 is the second angle. In the present embodiment, the absolute value of the first angle is less than the absolute value of the second angle. For example, if the first image modulation module 254a is located above the reference plane 280 along the direction of gravity, then the blue light beam 305a emitted from the first reflector 251a is deflected in the counterclockwise direction relative to the reference plane 280. In this embodiment, if the angle is deflected in the counterclockwise direction relative to the reference plane 280, the angle is defined as a positive angle, and if the angle is deflected in the clockwise direction relative to the reference plane 280, the angle is defined as a negative angle. For example, the blue light beam 305a shown in this embodiment deflects in the counterclockwise direction relative to the reference plane 280. It can be seen that the second angle shown in this embodiment is a positive angle. It should be clear that this embodiment does not limit the positional relationship between the first image modulation module 254a and the reference plane 280 when the projection system is in use. For example, when the projection system is in use, along the direction of gravity, the first image modulation module 254a is located below the reference plane 280. For another example, when the projection system is in use, along the direction of gravity, the first image modulation module 254a is located below the reference plane 280. For another example, when the projection system is in use, along the horizontal direction, the first image modulation module 254a is located on one side of the reference plane 280. It should also be clarified that, in this embodiment, the angle is defined as a positive angle when the angle is deflected in the counterclockwise direction relative to the reference plane 280, and no limitation is made. In other examples, the angle can also be defined as a negative angle when the angle is deflected in the counterclockwise direction relative to the reference plane 280. In this embodiment, the absolute value of the second angle is not less than 75 degrees and not greater than 105 degrees. It should be clarified that the description of the size of the second angle in this embodiment is an optional example and is not limited. In this embodiment, the first angle is zero degrees, that is, the transmission direction of the input light beam 301 is parallel to the reference plane 280, and the second angle is 90 degrees, that is, the transmission direction of the blue light beam 305a is perpendicular to the reference plane 280. For the description of the transmission direction of the green light beam 305b and the red light beam 305c, please refer to the description of the transmission direction of the blue light beam 305a, and no further details are given. In the case where the absolute value of the first angle shown in this embodiment is less than the absolute value of the second angle, the integration of the projection system is effectively improved and the volume of the projection system is reduced.

[0068] Optionally, the projection light core 400 may further include a second lens group, a second polarization conversion module 253a, a third polarization conversion module 253b and a fourth polarization conversion module 253c. Specifically, the second lens group includes lens 252a, lens 252b and lens 252c. Lens 252a is used to converge the blue light beam 305a emitted by the first reflector 251a to the second polarization conversion module 253a, lens 252b is used to converge the green light beam 305b emitted by the second reflector 251b to the third polarization conversion module 253b, and lens 252c is used to converge the red light beam 305c emitted by the third reflector 251c to the fourth polarization conversion module 253c. For the description of the structure of the second lens group, please refer to the description of the first lens group above, and no further details will be given. The second polarization conversion module 253a is used to purify the polarization state of the blue light beam 305a to output the purified blue light beam, so as to ensure that the polarization state of the purified blue light beam emitted from the second polarization conversion module 253a includes linear polarized light. In this embodiment, the proportion of linear polarized light in the purified blue light beam is increased by the second polarization conversion module 253a. For example, the proportion of linear polarized light in the purified blue light beam is 99%. It can be understood that the proportion of linear polarized light emitted from the second polarization conversion module 253a is greater than the proportion of linear polarized light emitted from the first polarization conversion module 204. In this embodiment, the second polarization conversion module 253a is used as a filter as an example. For example, the second polarization conversion module 253a can increase the proportion of P polarization state (polarization direction parallel to the paper) included in the emitted purified blue light beam. The third polarization conversion module 253b is used to purify the polarization state of the blue-green light beam 305b to output the purified green light beam, thereby increasing the proportion of the P polarization state included in the purified green light beam emitted from the third polarization conversion module 253b. The fourth polarization conversion module 253c is used to purify the polarization state of the red light beam 305c to output the purified red light beam, thereby increasing the proportion of the P polarization state included in the purified red light beam emitted from the fourth polarization conversion module 253c. Through the second polarization conversion module 253a, the third polarization conversion module 253b and the fourth polarization conversion module 253c shown in this embodiment, it is possible to ensure that the purity of the P polarization state of the purified blue light beam, the purified green light beam and the purified red light beam is improved, thereby improving the contrast of the first image modulation module 254a, the second image modulation module 254b and the third image modulation module 254c based on the purified blue light beam, the purified green light beam and the purified red light beam.

[0069] The first image modulation module 254a shown in this embodiment is located on the transmission optical path of the purified blue light beam emitted from the second polarization conversion module 253a, the second image modulation module 254b is located on the transmission optical path of the purified green light beam emitted from the third polarization conversion module 253b, and the third image modulation module 254c is located on the transmission optical path of the purified red light beam emitted from the fourth polarization conversion module 253c. Taking the first image modulation module 254a as an example, the first image modulation module 254a obtains the image source to be projected. Among them, the image source can be a video or a picture. Optionally, the first image modulation module 254a shown in this embodiment may include an external interface. The first image modulation module 254a receives an image source from any electronic device through the external interface. The external interface is connected to the electronic device. The external interface can be an external bus interface, a front side bus, a display interface, a video display interface or a graphic interface, etc. Wherein, the video display interface may be a digital visual interface (DVI), a high definition multimedia interface (HDMI) or a video graphics array (VGA), etc. Optionally, the first image modulation module 254a shown in this embodiment may include an internal interface. The internal interface of the first image modulation module 254a is connected to the controller. The first image modulation module 254a receives an image source from the controller through the internal interface. Wherein, the internal interface may be a bus, a local input / output port (I / O) bus, a hub interface bus, etc. The first image modulation module 254a modulates the purified blue light beam from the first image modulation module 254a according to the image source to obtain a first modulated light beam corresponding to the image source.

[0070] The controller may be one or more chips, or one or more integrated circuits. For example, the controller may be one or more optical digital signal processors (oDSP), field-programmable gate arrays (FPGA), application specific integrated circuits (ASIC), system on chip (SoC), central processor unit (CPU), network processor (NP), microcontroller unit (MCU), programmable logic device (PLD), network card chip, storage interface chip or other integrated chip, or any combination of the above chips or processors, etc., which will not be described in detail.

[0071] Figure 6a for Figure 2a A modulation example diagram of the first image modulation module shown. The first image modulation module 254a specifically includes a polarizer 601 and a reflective modulator 602. Among them, the reflective modulator 602 can be a digital micromirror device (DMD) or a liquid crystal on silicon (LCOS), etc., and the specific type is not limited in this embodiment. This embodiment takes the reflective modulator 602 as LCOS as an example. The reflective modulator 602 includes a plurality of pixel areas, each of which is used to receive a purified blue light beam. By controlling the voltage loaded to the reflective modulator 602, the pixel area is controlled to be Figure 6aThe non-projection state shown. The pixel area controlled to be in the non-projection state is in the closed state, and the modulated light beam is not transmitted to the light combining module 260. It can be understood that if the purified blue light beam is irradiated on the pixel area in the closed state, the purified blue light beam is transmitted so that it is not projected and displayed. Specifically, the polarization state of the purified blue light beam includes a P polarization state (the polarization direction shown is parallel to the paper surface). The purified blue light beam with a P polarization state can be transmitted from the polarizer 601 to the reflective modulator 602, and the polarization state of the purified blue light beam transmitted from the polarizer 601 does not change, and it is still a P polarization state. Because the pixel area where the purified blue light beam is incident is in a closed state, the reflective modulator 602 does not change the polarization state of the purified blue light beam, so that the polarization state of the dark state light beam 603 reflected from the reflective modulator 602 is a P polarization state. The dark state light beam 603 with a P polarization state is transmitted from the polarizer 601. Since the light combining module 260 is not located on the transmission optical path of the dark state light beam 603 transmitted from the polarizer 601, the dark state light beam 603 will not be transmitted to the light combining module 260, so that the light combining module 260 will not transmit the dark state light beam 603 to the lens 270, so as to ensure that the dark state light beam 603 will not be projected for imaging. The pixel area can also be controlled by controlling the voltage loaded to the reflective modulator 602. Figure 6b The projection state shown. Figure 6b for Figure 2a Another modulation example diagram of the first image modulation module shown. The pixel area controlled to be in the projection state is in the on state, and the modulated light beam is transmitted to the light combining module 260. It can be understood that when the purified blue light beam is irradiated on the pixel area in the on state, the purified blue light beam is reflected and transmitted to the light combining module 260 so that it can be projected and displayed. Specifically, the polarization state of the purified blue light beam includes a P polarization state. The purified blue light beam with a P polarization state can be transmitted from the polarizer 601 to the reflective modulator 602. Because the pixel area where the purified blue light beam is incident is in the on state, the reflective modulator 602 changes the polarization state of the purified blue light beam so that the first modulated light beam 604 reflected from the reflective modulator 602 includes an S polarization state (the polarization direction shown is perpendicular to the paper). The first modulated light beam 604 with an S polarization state is reflected by the polarizer 601 to emit a first modulated light beam 605. Since the light combining module 260 is located on the transmission optical path of the first modulated light beam 605 reflected from the polarizer 601, the first modulated light beam 605 will be transmitted to the light combining module 260, so that the light combining module 260 will transmit the first modulated light beam 605 to the lens 270 to ensure that the first modulated light beam 605 will be projected and imaged.

[0072] If the reflective modulator 602 shown in this embodiment is a DMD, the DMD includes a micromirror array, the micromirror array includes a plurality of micromirrors, each of which is used to receive a purified blue light beam. By controlling the deflection angle of each micromirror, the micromirror is controlled to be in a non-projection state or a projection state. For a micromirror controlled to be in a non-projection state, the purified blue light beam emitted from the micromirror cannot be transmitted to the light combining module 260. For a micromirror controlled to be in a projection state, the modulated light beam emitted from the micromirror will be transmitted to the light combining module 260.

[0073] The second image modulation module 254b receives the purified green light beam and modulates the purified green light beam to emit a second modulated light beam. The third image modulation module 254c receives the purified red light beam and modulates the purified red light beam to emit a third modulated light beam. For a detailed description of the process, please refer to Figure 6a as well as Figure 6b The first image modulation module 254a shown modulates the purified blue light beam to emit a first modulated light beam, and the specific process is not repeated here.

[0074] The light combining module 260 shown in this embodiment receives the first modulated light beam from the first image modulation module 254a, the second modulated light beam from the second image modulation module 254b, and the third modulated light beam from the third image modulation module 254c, and combines the first modulated light beam, the second modulated light beam, and the third modulated light beam to obtain an imaging light beam 310. The light combining module 260 described in this embodiment may be a prism, and the light combining module 260 may use spectral light combining, polarization light combining, or aperture light combining to output a projection light beam, and the light combining method is not specifically limited.

[0075] The lens 270 is located on the transmission optical path of the imaging light beam 310 emitted from the light combining module 260. The lens 270 receives the imaging light beam 310 and forms an image of the imaging light beam 310. The lens 270 includes one or more lenses. The lens forms a magnified real image of the imaging light beam 310. The lens may be a convex lens or a concave lens. Optionally, the projection system shown in this embodiment may also include a projection screen, so that the real image corresponding to the imaging light beam 310 emitted by the lens 270 can be displayed on the projection screen. Figure 2a and Figure 4aAs shown, the transmission direction of the imaging beam 310 is opposite to the transmission direction of the input beam 301 emitted from the light source 201. Specifically, the transmission direction of the imaging beam 310 is opposite to the transmission direction of the input beam 301 emitted from the light source 201, which can be referred to as the imaging beam 310 being transmitted in a direction opposite to the transmission direction of the input beam 301 emitted from the light source 201. In this embodiment, the angle between the input beam 301 and the reference plane 280 is not limited. For example, the input beam 301 is parallel to the reference plane 280. In this embodiment, the angle between the imaging beam 310 and the reference plane 280 is not limited. For example, the absolute value of the angle between the imaging beam 310 and the reference plane 280 is less than 15 degrees. In this embodiment, the angle between the projection of the input beam 301 and the imaging beam 310 on the reference plane 280 is not limited. For example, the projection of the input beam 301 and the imaging beam 310 on the reference plane 280 is overlapped or parallel. For another example, the input light beam 301 and the imaging light beam 310 may be projected at a certain angle on the reference plane 280, and the angle may be less than 15 degrees. The above description of the transmission direction of the input light beam 301 and the imaging light beam 310 is interpreted as the transmission direction of the imaging light beam 310 being opposite to the transmission direction of the input light beam 301 emitted from the light source 201.

[0076] In the projection system shown in this embodiment, the light splitting component is used as an optical device to split the entire light beam once, so that the first output module, the second output module and the third output module of the light splitting component respectively output monochromatic light beams. Moreover, the transmission direction of the imaging light beam shown in this embodiment is opposite to the transmission direction of the input light beam, and the projection system only needs one optical device, the light splitting component, to split the light beam, and no other optical device is needed to split the light beam, thereby reducing the length of the optical path between the input light beam emitted by the light source and the imaging light beam. Therefore, the integration of the projection system is effectively improved, the volume of the projection system is reduced, and the compactness of the projection system and the symmetry of the overall structure are improved.

[0077] Figure 2a In the illustrated embodiment, taking the first image modulation module, the second image modulation module and the third image modulation module as reflective modulators as an example, the projection system shown in this embodiment includes the first image modulation module, the second image modulation module and the third image modulation module, which are all transmissive modulators. Figure 7This is an example diagram of the overall structure of the second embodiment of the projection system provided in the present application. The projection system shown in this embodiment includes a light source 701, a projection light core and a lens 723. Among them, the projection light core may specifically include a light homogenizing device 702, a first polarization conversion module 703, a first lens group 704, a light splitting component 705, a reflector group 706, a second lens group 707, a second polarization conversion module 708, a third polarization conversion module 709 and a fourth polarization conversion module 710, a first image modulation module 721a, a second image modulation module 721b, a third image modulation module 721c and a light combining module 722. For a specific description of the structure of the projection light core shown in this embodiment, please refer to Figure 2a The corresponding instructions are not elaborated in detail.

[0078] The first image modulation module 721a shown in this embodiment is located on the transmission optical path of the purified blue light beam emitted from the second polarization conversion module 708, the second image modulation module 721b is located on the transmission optical path of the purified green light beam emitted from the third polarization conversion module 709, and the third image modulation module 721c is located on the transmission optical path of the purified red light beam emitted from the fourth polarization conversion module 710. For a description of the purified blue light beam, the purified green light beam, and the purified red light beam, please refer to Figure 2a The corresponding embodiments are not described in detail. Taking the first image modulation module 721a as an example, the first image modulation module 721a obtains an image source to be projected, and the first image modulation module 721a modulates the purified blue light beam from the first image modulation module 721a according to the image source to obtain a first modulated light beam corresponding to the image source.

[0079] Figure 8a for Figure 7 The first image modulation module 721a is a modulation example diagram. The first image modulation module 721a specifically includes a first polarizer 801, a transmissive modulator 802, and a second polarizer 803. The transmissive modulator 802 may be a liquid crystal display (LCD). The transmissive modulator 802 includes a plurality of pixel areas, each of which is used to receive a purified blue light beam 811. The control pixel area is Figure 8aThe non-projection state shown. The pixel area controlled to be in the non-projection state is in the closed state and does not transmit the modulated light beam to the light combining module 722. Specifically, the polarization state of the purified blue light beam 811 includes a P polarization state. The purified blue light beam 811 with a P polarization state can be transmitted from the first polarizer 801 to the transmission modulator 802, and the polarization state of the purified blue light beam 811 transmitted from the first polarizer 801 does not change and remains in the P polarization state. It can be understood that the first polarizer 801 transmits P polarized light and reflects S polarized light. Because the pixel area where the purified blue light beam 811 is incident is in the closed state, the transmission modulator 802 does not change the polarization state of the purified blue light beam 811, so that the polarization state of the dark state light beam 812 transmitted from the transmission modulator 802 is a P polarization state. The second polarizer 803 transmits S polarized light and reflects P polarized light. Then, the dark light beam 812 with the P polarization state is reflected from the second polarizer 803. Since the light combining module 722 is not located on the transmission light path of the dark light beam 812 reflected from the second polarizer 803, the dark light beam 812 will not be transmitted to the light combining module 722, so that the light combining module 722 will not transmit the dark light beam 812 to the lens, thereby ensuring that the dark light beam 812 will not be projected for imaging. The pixel area of ​​the transmissive modulator 802 can also be controlled to be Figure 8b The projection state shown. Figure 8b for Figure 7Another modulation example diagram of the first image modulation module shown. When the pixel area controlled to be in the projection state is in the on state, the modulated light beam is transmitted to the light combining module 722. It can be understood that if the purified blue light beam 811 is irradiated on the pixel area in the on state, the purified blue light beam 811 can be successfully transmitted to the light combining module 722 so that it can be projected and displayed. Specifically, the polarization state of the purified blue light beam 811 includes a P polarization state. The purified blue light beam 811 with a P polarization state can be transmitted from the first polarizer 801 to the transmission modulator 802. Among them, the first polarizer 801 transmits P polarized light and reflects S polarized light. Because the pixel area where the purified blue light beam 811 is incident is in the on state, the transmission modulator 802 changes the polarization state of the purified blue light beam 811 so that the first modulated light beam 813 transmitted from the transmission modulator 802 includes an S polarization state. The first modulated light beam 813 with an S polarization state is transmitted by the second polarizer 803. Among them, the second polarizer 803 transmits the S polarization state and reflects the P polarization light. Then, the first modulated light beam 813 with the S polarization state is transmitted to the light combining module 722 by the second polarizer 803. Since the light combining module 722 is located on the transmission light path of the first modulated light beam 813 transmitted from the second polarizer 803, the first modulated light beam 813 will be transmitted to the light combining module 722, so that the light combining module 722 will transmit the first modulated light beam 813 to the lens, so as to ensure that the first modulated light beam 813 will be projected and imaged.

[0080] The second image modulation module 721b receives the purified green light beam and modulates the purified green light beam to emit a second modulated light beam. The third image modulation module 721c receives the purified red light beam and modulates the purified red light beam to emit a third modulated light beam. For a detailed description of the process, please refer to Figure 8a as well as Figure 8b The first image modulation module 721a shown modulates the purified blue light beam 811 to emit a first modulated light beam, and the specific process is not repeated here.

[0081] The light combining module 722 shown in this embodiment receives the first modulated light beam from the first image modulation module 721a, the second modulated light beam from the second image modulation module 721b, and the third modulated light beam from the third image modulation module 721c, and combines the first modulated light beam, the second modulated light beam, and the third modulated light beam to obtain an imaging light beam. The lens 723 is located on the transmission light path of the imaging light beam emitted from the light combining module 722. The lens 723 receives the imaging light beam and forms an image of the imaging light beam. For a description of the light combining module 722 and the lens 723 shown in this embodiment, please refer to Figure 2a The corresponding instructions are not elaborated in detail.

[0082] In the projection system shown in this embodiment, the light splitting component is used as an optical device to split the entire light beam once, so that the first output module, the second output module and the third output module included in the light splitting component respectively output monochromatic light beams. It can be understood that the projection system only needs one optical device, the light splitting component, to split the light beam, and no other optical device is needed to split the light beam, which will reduce the optical path length between the light beam emitted by the light source and the imaging light beam, reduce the volume of the projection system, and improve the integration of the projection system.

[0083] The above-mentioned projection system is a three-chip projection system as an example, wherein the three-chip projection system means that the projection system includes three image modulation modules, namely the first image modulation module, the second image modulation module and the third image modulation module shown in the above-mentioned embodiment. This embodiment takes the projection system as a single-chip projection system as an example, wherein the single-chip projection system means that the projection system only includes one image modulation module. Fig. 9 This is an example diagram of the overall structure of the third embodiment of the projection system provided in this application. Fig. 9 The projection system shown in the figure specifically includes a light source 921, a light splitting component 922, a reflector group 901, an image modulation module 903 and a lens 904. For a detailed description of the light source 921, the light splitting component 922, the reflector group 901, the image modulation module 903 and the lens 904, see Figure 2a or Figure 7As shown, the specific details are not repeated. The projection system also includes a controller 905 and a filter color wheel 902 located between the reflector group 901 and the image modulation module 903. It can be understood that the reflector group 901 is used to emit a blue light beam 911a, a green light beam 911b and a red light beam 911c. The filter color wheel 902 can rotate under the drive of the controller 905. The filter color wheel 902 has been coated with blue, red and green films. In the first time period, the controller 905 drives the blue coating of the filter color wheel 902 to rotate to the transmission light path of the projection light beam emitted from the reflector group 901, then, only the blue light beam 911a can pass through the filter color wheel 902 to be transmitted to the image modulation module 903. In the second time period, the controller 905 drives the red coating of the filter color wheel 902 to rotate to the transmission light path of the projection light beam emitted from the reflector group 901, then only the red light beam 911c can pass through the filter color wheel 902 to be transmitted to the image modulation module 903. Similarly, in the third time period, when the controller 905 drives the green coating of the filter color wheel 902 to rotate to the transmission light path of the projection light beam emitted from the reflector group 901, only the green light beam 911b can pass through the filter color wheel 902 to be transmitted to the image modulation module 903. The intersection of any two time periods in the first time period, the second time period and the third time period shown in this embodiment on the time axis is empty. It can be understood that the image modulation module 903 receives the blue light beam 911a, the green light beam 911b and the red light beam 911c in time division. The image modulation module 903 realizes the RGB three-color synthesis imaging light beam, and transmits the imaging light beam to the lens 904, so that the lens 904 projects the imaging light beam for imaging.

[0084] Fig.10 This is an example diagram of an embodiment of the head-up display system provided in this application. The head-up display (HUD) system shown in this embodiment includes a projection system 1001 and a light deflection module 1003. For a description of the structure of the projection system 1001, please refer to Figure 2a , Figure 7 or Fig. 9 As shown in any embodiment, the details are not repeated here. The HUD system projects vehicle-related information to the front of the driver's field of vision. The vehicle-related information may be instrument information (such as vehicle speed) or navigation information, etc. Then, the driver can see the vehicle-related information in front of the field of vision without having to look down at the instrument panel or central control display under the steering wheel, thereby improving the braking reaction time in an emergency and improving driving safety.

[0085] The projection system 1001 shown in this embodiment can modulate vehicle-related information on the projection beam to obtain an imaging beam 1011. The light deflection module 1003 can form an enlarged virtual image 1012 of the imaging beam in front of the vehicle. Among them, the light deflection module 1003 shown in this embodiment can be a curved mirror. The curved mirror will enlarge the light spot of the imaging beam 1011 to transmit it to the windshield 1005 of the vehicle. The windshield 1005 reflects the imaging beam 1011 to the driver's eyes for imaging. That is, the reverse extension line of the image formed in the driver's eyes forms a virtual image 1012 in front of the vehicle. This embodiment takes the application of the HUD system to a vehicle as an example. In other examples, the HUD system can also be applied to driving tools that require a driver to drive, such as ships, airplanes, and helicopters.

[0086] This embodiment also provides a vehicle. The vehicle includes Fig.10 The HUD system and windshield shown. Of course, the vehicle may also include other components, such as a steering wheel, a processor, a memory, a wireless communication device, and a sensor, etc., which are not specifically limited in this embodiment.

[0087] Fig.11 This is an example diagram of the structure of an embodiment of the projection lamp provided in this application. The projection lamp includes a fixing base and a projection system 1101. The fixing base can fix the projection system 1101 on the vehicle. For a description of the projection system 1101, please refer to Figure 2a , Figure 7 or Fig. 9 As shown in any embodiment, the details are not repeated here. The projection system 1101 modulates the projection light beam to output an imaging light beam. The imaging light beam emitted from the projection system 1101 can be imaged on the road surface on which the vehicle is traveling. Specifically, the imaging light beam displays a target light type in the road surface projection area of ​​the road surface to form an image. The target light type formed by the imaging light beam can be a light blanket displayed in the road surface projection area. The light blanket prompts the driver with the vehicle's advanced driving assistance system (ADAS) information, the main data on the vehicle dashboard (fuel consumption, engine speed, temperature, etc.), vehicle speed information, steering wheel angle information or vehicle body posture data, etc. through the modulated image, color, light type, etc., which is not limited in this embodiment. The imaging light beam displayed in the target light type emitted by the projection lamp shown in this embodiment can also be used to illuminate the road surface around the vehicle, etc., to improve driving safety or navigation efficiency.

[0088] The projection lamp shown in this embodiment is used for vehicle lighting and image projection, and can be a low beam lamp or an adaptive high beam lamp to realize vehicle assisted automatic driving. The vehicle can be an autonomous vehicle (autonomous vehicles; self-piloting automobile) also known as an unmanned vehicle, and the vehicle can also be a car, truck, motorcycle, public vehicle, lawn mower, recreational vehicle, amusement park vehicle, tram, golf cart, train, or cart, etc.

[0089] The present embodiment provides a pair of smart glasses, and the smart glasses shown in the present embodiment may be AR glasses or VR glasses. Smart glasses are a technology that cleverly integrates virtual information with the real world. It widely uses a variety of technical means such as multimedia, three-dimensional modeling, real-time tracking and registration, intelligent interaction, and sensing to simulate computer-generated virtual information such as text, images, three-dimensional models, music, and videos, and apply them to the real world. The two types of information complement each other, thereby achieving "enhancement" of the real world. With the enrichment of the variety of smart products, it is becoming more and more convenient for users to use. The smart glasses include a frame, lenses, a projection light core, and a light source. For a description of the light source and the projection light core, please refer to Figure 2a , Figure 7 or Fig. 9 As shown in any embodiment, the details are not repeated here. The lens, the projection light core and the light source are fixed on the frame, and the projection light core modulates the input light beam from the light source to obtain an imaging light beam. The projection light core projects the imaging light beam onto the lens facing the wearer's eye side, so as to utilize the reflection function of the lens to reflect the imaging light beam into the wearer's eye.

[0090] The present application also provides a vehicle, Fig.12 A functional block diagram of an embodiment of a vehicle provided in the present application. In one embodiment, a vehicle 1200 is configured to be in a fully or partially autonomous driving mode. The vehicle shown in this embodiment includes a vehicle body, which is used to fix a sensor system 1220, an advanced driving assistance system (ADAS) 1210, a peripheral device 1230, a computer system 1240, a projection lamp 1250, and a HUD system 1260.

[0091] The sensor system 1220 includes several sensors that sense information about the environment around the vehicle 1200. For example, the sensor system 1220 may include a positioning system (the positioning system may be a global positioning system (GPS) system, or a Beidou system or other positioning system), an inertial measurement unit (IMU), a radar, a laser rangefinder, and a camera, etc. The sensor system 1220 may also include sensors of the internal systems of the monitored vehicle 1200 (e.g., an in-vehicle air quality monitor, a fuel gauge, an oil temperature gauge, etc.). Sensor data from one or more of these sensors may be used to detect objects and their corresponding characteristics (position, shape, direction, speed, etc.). Such detection and recognition are key functions for the safe operation of the autonomous vehicle 1200. The positioning system may be used to estimate the geographic location of the vehicle 1200. The IMU is used to sense the position and orientation changes of the vehicle 1200 based on inertial acceleration. In one embodiment, the IMU may be a combination of an accelerometer and a gyroscope. The radar may use radio signals to sense objects within the surrounding environment of the vehicle 1200. In some embodiments, in addition to sensing objects, radar can also be used to sense the speed and / or direction of travel of an object. The present embodiment does not limit the specific type of radar, for example, the radar can be a millimeter wave radar or a laser radar. A laser rangefinder can use lasers to sense objects in the environment where the vehicle 1200 is located. In some embodiments, the laser rangefinder may include one or more laser sources, a laser scanner, and one or more detectors, as well as other system components. A camera can be used to capture multiple images of the surrounding environment of the vehicle 1200. The camera can be a static camera, a video camera, a single / binocular camera, or an infrared imager.

[0092] ADAS1210 senses the surrounding environment at any time during the driving process, collects data, identifies, detects and tracks static and dynamic objects, and combines navigation map data to perform systematic calculations and analysis, so that the driver can be aware of possible dangers in advance, effectively increasing the comfort and safety of vehicle driving. For example, ADAS1210 can control the vehicle through the data obtained by the sensor system 1220. For another example, ADAS1210 can control the vehicle through the vehicle computer data, where the vehicle computer data can be the main data on the vehicle dashboard (fuel consumption, engine speed, temperature, etc.), vehicle speed information, steering wheel angle information, or vehicle body posture data.

[0093] The vehicle 1200 interacts with external sensors, other vehicles, other computer systems, or users through the peripheral device 1230. The peripheral device 1230 may include a wireless communication system, an onboard computer, a microphone, and / or a speaker. In some embodiments, the peripheral device 1230 provides a means for the user of the vehicle 1200 to interact with the user interface. For example, the onboard computer may provide information to the user of the vehicle 1200. The user interface may also operate the onboard computer to receive the user's input. The onboard computer may be operated through a touch screen. In other cases, the peripheral device 1230 may provide a means for the vehicle 1200 to communicate with other devices located in the vehicle. For example, a microphone may receive audio (e.g., voice commands or other audio input) from the user of the vehicle 1200. Similarly, a speaker may output audio to the user of the vehicle 1200. The wireless communication system may communicate wirelessly with one or more devices directly or via a communication network.

[0094] Some or all functions of the vehicle 1200 are controlled by the computer system 1240. The computer system 1240 may control the functions of the vehicle 1200 based on inputs received from various systems (e.g., the sensing system 1220, the ADAS 1210, the peripheral device 1230) and from the user interface. The computer system 1240 may include at least one processor that executes instructions stored in a non-transitory computer-readable medium such as a memory. The computer system 1240 may also be a plurality of computing devices that control individual components or subsystems of the vehicle 1200 in a distributed manner. This embodiment does not limit the type of processor. For a description of the type of processor, please refer to the above description of the controller included in the light source, and no further details will be given.

[0095] The processor can obtain vehicle driving related information from the peripheral device 1230, the sensor system 1220 and / or the ADAS 1210, and send it to the projection lamp 1250. For a description of the projection lamp 1250, see Fig.11 The processor sends the vehicle driving related information to the HUD system 1260. For the description of the HUD system 1260, please refer to Fig.10 As shown, the details are not repeated here.

[0096] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A projection light core, characterized in that: The invention comprises a light splitting component, a reflector group and an image modulation module, wherein the light splitting component comprises a first dichroic mirror and a second dichroic mirror, and the first dichroic mirror and the second dichroic mirror intersect; The beam splitting component is used to split the input beam to obtain a projection beam, and transmit the projection beam to the reflector group, wherein the projection beam includes a blue beam, a green beam and a red beam; The reflector group is used to reflect the projection light beam to the image modulation module, the light splitting component intersects at a reference plane, a transmission direction of the input light beam and the reference plane have a first angle, a transmission direction of the projection light beam emitted from the reflector group and the reference plane have a second angle, and an absolute value of the first angle is smaller than an absolute value of the second angle; The image modulation module is used to modulate the projection light beam to obtain an imaging light beam, and the imaging light beam is used for projection imaging.

2. The projection light core according to claim 1, characterized in that: The transmission direction of the imaging light beam is opposite to the transmission direction of the input light beam.

3. The projection light core according to claim 1 or 2, characterized in that: The absolute value of the second angle is not less than 75 degrees and not greater than 105 degrees.

4. The projection light core according to any one of claims 1 to 3, characterized in that: If the image modulation module is located above the reference plane along the gravity direction, the projection light beam emitted from the reflector assembly is deflected in a counterclockwise direction relative to the reference plane.

5. The projection light core according to any one of claims 1 to 4, characterized in that: The reflector group includes a first reflector, a second reflector and a third reflector, and the first reflector, the second reflector and the third reflector are respectively located on the transmission light paths of the blue light beam, the green light beam and the red light beam emitted from the beam splitter component, the first reflector is used to reflect the blue light beam to the image modulation module, the second reflector is used to reflect the green light beam to the image modulation module, and the third reflector is used to reflect the red light beam to the image modulation module.

6. The projection light core according to any one of claims 1 to 5, characterized in that: The light splitting component includes a first output module, a second output module and a third output module. The first output module is used to output the blue light beam, the second output module is used to output the green light beam, and the third output module is used to output the red light beam.

7. The projection light core according to claim 6, characterized in that: The first dichroic mirror includes a first sub-mirror and a second sub-mirror, the second dichroic mirror includes a third sub-mirror and a fourth sub-mirror, and the first output module includes the third sub-mirror and the fourth sub-mirror; The first sub-mirror is used to receive the input light beam and split the input light beam to obtain a first mixed light beam, and the first sub-mirror is used to transmit the first mixed light beam to the third sub-mirror; the third sub-mirror is used to split the first mixed light beam to obtain one blue light beam, and the third sub-mirror is used to reflect the one blue light beam; The fourth sub-mirror is used for receiving the input light beam and splitting the input light beam to obtain another path of the blue light beam, and the fourth sub-mirror is used for reflecting the other path of the blue light beam.

8. The projection light core according to claim 6 or 7, characterized in that: The first dichroic mirror includes a first sub-mirror and a second sub-mirror, the second dichroic mirror includes a third sub-mirror and a fourth sub-mirror, and the second output module includes the second sub-mirror and the third sub-mirror; The first sub-mirror is used to receive the input light beam, split the input light beam to obtain a first mixed light beam, and the first sub-mirror is used to transmit the first mixed light beam to the third sub-mirror; the third sub-mirror is used to split the first mixed light beam to obtain a green light beam, and the third sub-mirror is used to transmit the green light beam; The fourth sub-mirror is used to receive the input light beam and split the input light beam to obtain a second mixed light beam. The fourth sub-mirror is used to transmit the second mixed light beam to the second sub-mirror. The second sub-mirror is used to split the second mixed light beam to obtain another green light beam. The second sub-mirror is used to transmit the other green light beam.

9. The projection light core according to any one of claims 6 to 8, characterized in that: The first dichroic mirror includes a first sub-mirror and a second sub-mirror, the second dichroic mirror includes a third sub-mirror and a fourth sub-mirror, and the third output module includes the first sub-mirror and the second sub-mirror; The first sub-mirror is used to receive the input light beam, split the input light beam to obtain one red light beam, and the first sub-mirror is used to reflect the one red light beam; The fourth sub-mirror is used to receive the input light beam and split the input light beam to obtain a second mixed light beam, the fourth sub-mirror is used to transmit the second mixed light beam to the second sub-mirror, the second sub-mirror is used to split the second mixed light beam to obtain another red light beam, and the second sub-mirror is used to reflect the other red light beam.

10. The projection light core according to any one of claims 1 to 9, characterized in that: The projection light core further comprises a light homogenizing device, and the light homogenizing device is used for homogenizing the light beam to obtain the homogenized input light beam.

11. The projection optical core according to any one of claims 1 to 10, characterized in that: The projection light core further comprises a first polarization conversion module, wherein the first polarization conversion module is used to convert a light beam into the input light beam, wherein the input light beam comprises linearly polarized light.

12. The projection optical core according to any one of claims 1 to 11, characterized in that: The transmission optical path of the blue light beam emitted by the spectroscopic component includes a second polarization conversion module, and the second polarization conversion module is used to convert the blue light beam into a purified blue light beam, and the purified blue light beam includes linear polarized light; the transmission optical path of the green light beam emitted by the spectroscopic component includes a third polarization conversion module, and the third polarization conversion module is used to convert the green light beam into a purified green light beam, and the purified green light beam includes linear polarized light; the transmission optical path of the red light beam emitted by the spectroscopic component includes a fourth polarization conversion module, and the fourth polarization conversion module is used to convert the red light beam into a purified red light beam, and the purified red light beam includes linear polarized light, and the projection light beam includes the purified blue light beam, the purified green light beam and the purified red light beam.

13. The projection optical core according to any one of claims 1 to 12, characterized in that: The image modulation module includes a first image modulation module, a second image modulation module, a third image modulation module and a light combining module: The first image modulation module is used to modulate the blue light beam to obtain a first modulated light beam; The second image modulation module is used to modulate the green light beam to obtain a second modulated light beam; The third image modulation module is used to modulate the red light beam to obtain a third modulated light beam; The light combining module is used for combining the first modulated light beam, the second modulated light beam and the third modulated light beam to obtain the imaging light beam.

14. The projection optical core according to any one of claims 1 to 12, characterized in that: The projection light core also includes a color filter wheel, and the color filter wheel is used for: Splitting the projection light beam in a first time period to obtain a blue projection light beam, and transmitting the blue projection light beam to the modulation module; Splitting the projection light beam in a second time period to obtain a red projection light beam, and transmitting the red projection light beam to the modulation module; The projection beam is split in a third time period to obtain a green projection beam, and the green projection beam is transmitted to the modulation module, wherein the intersection of any two time periods among the first time period, the second time period and the third time period on the time axis is empty.

15. A projection system, characterized in that: The projection system comprises a light source, a lens and a projection light core as claimed in any one of claims 1 to 14; The projection light core is used to receive the input light beam from the light source; The lens is used to receive the imaging light beam from the projection light core and project the imaging light beam into an image.

16. A head-up display system, characterized in that: comprising a light deflection module and a projection system as claimed in claim 15; The projection system is used to transmit the imaging light beam to the light deflection module; The light deflection module is used to transmit the amplified imaging light beam to the windshield, and the imaging light beam forms a virtual image through the windshield.

17. A vehicle lamp, characterized in that: It comprises a fixing base and the projection system as claimed in claim 15, wherein the fixing base is used to fix the projection system on a vehicle.

18. A vehicle, characterized in that: The vehicle comprises a vehicle body, a windshield and a processor, wherein the vehicle body is used to fix the windshield and the processor, and the vehicle further comprises the head-up display system as claimed in claim 16 or the vehicle lamp as claimed in claim 17; The processor is used to transmit vehicle driving related information to the image modulation module; The image modulation module is used to modulate the vehicle driving related information on the projection light beam to obtain the imaging light beam.

19. A pair of smart glasses, characterized in that: The smart glasses include a frame, a lens, a light source, and a projection light core as claimed in any one of claims 1 to 14, wherein the frame is used to fix the lens, the light source, and the projection light core; The projection light core is used to receive the input light beam from the light source; The lens is used to receive the imaging light beam from the projection light core and project the imaging light beam into an image.

Images