Projection light engine and vehicle

Abstract

The present application relates to the field of projection devices and provides a projection light engine and a vehicle. The projection light engine comprises a light source assembly and an imaging structure sequentially arranged along a projection light path. The light source assembly emits light toward the imaging structure, and at least part of the light passes through the imaging structure along the projection light path to form projection light. The projection light engine further comprises at least one stray light absorption structure used to absorb stray light from the light source assembly.

Description

Projection optical engines and vehicles

[0001] This application claims priority to Chinese Patent Application No. 202411808746.5, filed on December 9, 2024, entitled “Projection Optical Engine and Vehicle”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of projection equipment, and more particularly to projection optical engines and vehicles. Background Technology

[0003] With the continuous development of projection technology, projection optical engines are being used more and more widely in vehicles and home applications. A projection optical engine includes a light source assembly and an imaging structure arranged sequentially along the projection optical path to realize the imaging process.

[0004] However, during the use of a projection optical engine, stray light that does not propagate along the projection optical path is prone to be generated, resulting in poor imaging performance. Summary of the Invention

[0005] This application provides a projection optical engine and a vehicle to solve the problem that the projection optical engine easily generates stray light that does not propagate along the projection optical path, resulting in poor imaging effect.

[0006] This application provides a projection optical engine, including a light source assembly and an imaging structure arranged sequentially along the projection optical path;

[0007] The light source assembly emits light to the imaging structure, and at least a portion of the light passes through the imaging structure along the projection light path to form projection light.

[0008] The projection optical engine further includes at least one stray light absorption structure for absorbing stray light from the light source assembly.

[0009] By adopting the above technical solution, the projection optical engine includes a light source component and an imaging structure arranged sequentially along the projection optical path. During the use of the projection optical engine, the light source component can emit light to the imaging structure, and at least part of the light can pass through the imaging structure along the projection optical path to form projection light, thereby enabling the projection optical engine to achieve imaging through the projection light.

[0010] During the use of a projection optical engine, some of the light emitted by the light source component deviates from the projection optical path, forming stray light. The stray light absorption structure of the projection optical engine is used to absorb stray light from the light source component that has not propagated along the projection optical path, thereby reducing the interference of stray light on the projection light propagating along the projection optical path and improving the imaging effect of the projection optical engine.

[0011] In some possible implementations, the light source assembly includes a light source with its light-emitting side facing the imaging structure.

[0012] In some possible implementations, the light source assembly includes a plurality of light sources and a dichroic mirror assembly, wherein the light sources emit light toward the dichroic mirror assembly along the projection light path;

[0013] The dichroic mirror assembly is used to combine light rays from multiple light sources to form composite light, and to propagate the composite light along the projection light path toward the imaging structure.

[0014] In some possible implementations, the plurality of light sources includes a first light source and a second light source.

[0015] In some possible implementations, the dichroic mirror assembly includes a dichroic mirror.

[0016] In some possible implementations, the first light source is disposed on the first surface side of the dichroic mirror.

[0017] In some possible implementations, the second light source is disposed on the second surface side of the dichroic mirror.

[0018] In some possible implementations, the stray light absorption structure is disposed on the second surface side of the dichroic mirror.

[0019] In some possible implementations, the incident light side of the stray light absorbing structure is disposed facing the second surface of the dichroic mirror.

[0020] In some possible implementations, the plurality of light sources includes a first light source, a second light source, and a third light source.

[0021] In some possible implementations, the dichroic mirror assembly includes a first dichroic mirror.

[0022] In some possible implementations, the first light source is disposed on the first surface side of the first dichroic mirror.

[0023] In some possible implementations, the second light source is disposed on the second surface side of the first dichroic mirror.

[0024] In some possible implementations, the dichroic mirror assembly includes a second dichroic mirror, the first surface of which is disposed facing the first light source.

[0025] In some possible implementations, the second surface of the second dichroic mirror is positioned facing the third light source.

[0026] In some possible implementations, the first dichroic mirror and the second dichroic mirror are spaced apart.

[0027] In some possible implementations, the second surface of the first dichroic mirror is disposed opposite to the first surface of the second dichroic mirror.

[0028] In some possible implementations, the second light source and the third light source are spaced apart.

[0029] In some possible implementations, the second light source is disposed between the first dichroic mirror and the second dichroic mirror.

[0030] In some possible implementations, the light emission direction of the first light source is perpendicular to the light emission direction of the second light source.

[0031] In some possible implementations, the light emission direction of the second light source is parallel to the light emission direction of the third light source.

[0032] In some possible implementations, the first light source, the second light source, and the third light source emit different wavelengths;

[0033] The first light source emits light of a first wavelength, the second light source emits light of a second wavelength, and the third light source emits light of a third wavelength.

[0034] In some possible implementations, along the projection light path, the first wavelength light passes through the first dichroic mirror and is reflected by the second dichroic mirror before propagating to the imaging structure.

[0035] In some possible implementations, along the projection optical path, the second wavelength light is reflected by the first dichroic mirror and then by the second dichroic mirror before propagating toward the imaging structure.

[0036] In some possible implementations, the third wavelength light propagates toward the imaging structure after passing through the second dichroic mirror along the projection light path.

[0037] In some possible implementations, the stray light absorption structure includes a first light-absorbing structure;

[0038] The light-incident side of the first light-absorbing structure is disposed facing the first surface of the first dichroic mirror.

[0039] In some possible implementations, the first light-absorbing structure absorbs the first wavelength light reflected by the first dichroic mirror.

[0040] In some possible implementations, the first light-absorbing structure absorbs the second wavelength of light transmitted through the first dichroic mirror.

[0041] In some possible implementations, the stray light absorption structure includes a second light-absorbing structure;

[0042] The light-incident side of the second light-absorbing structure is disposed facing the second surface of the second dichroic mirror.

[0043] In some possible implementations, the second light-absorbing structure absorbs the first wavelength light and the second wavelength light transmitted through the second dichroic mirror.

[0044] In some possible implementations, the second light-absorbing structure absorbs the third wavelength light reflected by the second dichroic mirror.

[0045] In some possible implementations, the light source is configured as an inorganic light-emitting diode.

[0046] In some possible implementations, the imaging structure includes a first imaging component and a second imaging component.

[0047] In some possible implementations, the first imaging component includes a polarizing beam splitter, the first surface of which faces the light source component.

[0048] In some possible implementations, the second surface of the polarizing beam splitter faces the second imaging component.

[0049] In some possible implementations, the polarizing beam splitter is shaped like a sheet.

[0050] In some possible implementations, the polarizing beam splitter includes a polarizing beam splitter film made of a material selected from metal wire grids, organic materials, and inorganic materials.

[0051] In some possible implementations, along the projection optical path, the polarizing beam splitter is used to transmit a first portion of the polarized light from the light source assembly and to propagate the first portion of the polarized light toward the second imaging assembly.

[0052] In some possible implementations, the first imaging component further includes a waveplate for reflecting light from the polarizing beam splitter.

[0053] In some possible implementations, the stray light absorption structure includes a third light-absorbing structure for absorbing a second portion of the polarized light reflected by the polarizing beam splitter.

[0054] In some possible implementations, the light-incident side of the third light-absorbing structure faces the first surface of the polarizing beam splitter.

[0055] In some possible implementations, the first imaging component includes a collimation correction element.

[0056] In some possible implementations, the radius of curvature of the collimation corrector is greater than or equal to 51 mm and less than or equal to 56 mm.

[0057] In some possible implementations, the thickness of the collimation correction element is greater than or equal to 1 mm and less than or equal to 3 mm.

[0058] In some possible implementations, the first imaging component includes a first aperture and a second aperture.

[0059] In some possible implementations, the aperture size of the first aperture is larger than the aperture size of the second aperture.

[0060] In some possible implementations, the second imaging component is located on the first side of the first imaging component.

[0061] In some possible implementations, the second imaging component and the light source component are located at opposite ends of the first imaging component along the projection optical path.

[0062] In some possible implementations, when the stray light absorption structure includes a first light-absorbing structure, the first light-absorbing structure is located on a first side of the first imaging component.

[0063] In some possible implementations, when the stray light absorption structure includes a first light-absorbing structure, the first light-absorbing structure is located at one end of the first imaging component near the light source component.

[0064] In some possible implementations, when the stray light absorption structure includes a second light-absorbing structure, the second light-absorbing structure is located on a second side of the first imaging component.

[0065] In some possible implementations, when the stray light absorption structure includes a second light-absorbing structure, the second light-absorbing structure is located at one end of the first imaging component near the light source component.

[0066] In some possible implementations, the third light-absorbing structure is located on the second side of the first imaging component.

[0067] In some possible implementations, the third light-absorbing structure is located at the end of the first imaging component away from the light source component.

[0068] In some possible implementations, the stray light absorbing structure includes a housing that surrounds a reflective cavity.

[0069] In some possible implementations, the reflecting cavity is used to deflect the stray light to increase the incident angle of the stray light within the reflecting cavity.

[0070] In some possible implementations, at least a portion of the cavity wall of the reflecting cavity is provided with reflecting grooves, which are used to increase the incident angle of the stray light.

[0071] In some possible implementations, the stray light absorption structure further includes a reflective sheet disposed within the reflective cavity.

[0072] In some possible implementations, the stray light absorption structure includes a unidirectional light-transmitting element;

[0073] The one-way light-transmitting element is used to absorb stray light into the reflecting cavity and block light rays propagating from the reflecting cavity into the projection light path.

[0074] In some possible implementations, the unidirectional light-transmitting element is configured such that the transmittance of light rays at a large incident angle is less than the transmittance of light rays at a small incident angle.

[0075] In some possible implementations, the number of stray light absorbing structures is set to multiple, and at least two of the stray light absorbing structures have interconnected reflective cavities.

[0076] In some possible implementations, the projection optical engine also includes a housing.

[0077] In some possible implementations, the light source assembly and the imaging structure are disposed within the housing.

[0078] In some possible implementations, the housing is reused to form at least a portion of the stray light absorption structure.

[0079] In some possible implementations, the housing is provided with a first partition plate, which is used to form part of the accommodating member.

[0080] In some possible implementations, the first surface of the first partition plate and the housing form the reflective cavity.

[0081] In some possible implementations, the second surface of the first partition plate and the housing form a mounting cavity for accommodating a portion of the imaging structure.

[0082] In some possible implementations, the first surface of the first separator is provided with a reflective groove, which is used to increase the incident angle of the stray light.

[0083] In some possible implementations, the housing is provided with a second partition plate, which is used to form part of the accommodating member.

[0084] In some possible implementations, the first surface of the second partition plate and the first portion of the housing form a reflective cavity.

[0085] In some possible implementations, the first surface of the second separator is provided with reflective grooves.

[0086] In some possible implementations, the second surface of the second partition plate and the second portion of the housing form another of the reflective cavities.

[0087] In some possible implementations, the second surface of the second separator is provided with reflective grooves.

[0088] This application provides a vehicle that includes the aforementioned projection optical engine.

[0089] Since the vehicle includes any of the aforementioned projection optical engines, the advantages of including any of the aforementioned projection optical engines can be found in the relevant descriptions above, and will not be repeated here. Attached Figure Description

[0090] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0091] Figure 1 is a schematic diagram of the projection optical engine provided in an embodiment of this application;

[0092] Figure 2 is a schematic diagram of a projection optical engine with a light source provided in an embodiment of this application;

[0093] Figure 3 is a schematic diagram of the structure of a projection optical engine with a first light source and a second light source provided in an embodiment of this application;

[0094] Figure 4 is a schematic diagram of a light source assembly with a first light source and a second light source and a stray light absorption structure provided in an embodiment of this application;

[0095] Figure 5 is a schematic diagram of the structure of a projection optical engine with a first light source, a second light source, and a third light source provided in an embodiment of this application;

[0096] Figure 6 is a schematic diagram of the structure of a light source assembly having a first light source, a second light source, and a third light source provided in an embodiment of this application;

[0097] Figure 7 is a schematic diagram of the structure of the first imaging component and the second imaging component provided in the embodiment of this application;

[0098] Figure 8 is a schematic diagram of the principle of the light-diffusing device provided in the embodiment of this application;

[0099] Figure 9 is a schematic diagram of a large incident angle ray entering a homogenizing element according to an embodiment of this application;

[0100] Figure 10 is a schematic diagram of the waveplate provided in the embodiment of this application;

[0101] Figure 11 is a schematic diagram of a projection optical engine including multiple stray light absorption structures provided in an embodiment of this application;

[0102] Figure 12 is a schematic diagram of the transmittance and incident angle of the unidirectional light-transmitting element provided in the embodiment of this application;

[0103] Figure 13 is a schematic diagram of a stray light absorption structure including multiple openings provided in an embodiment of this application.

[0104] Explanation of reference numerals in the attached figures: 100, Light source assembly; 110, Light source; 110a, First light source; 110b, Second light source; 110c, Third light source; 120, Collimator; 130, Dichroic mirror; 130a, First dichroic mirror; 130b, Second dichroic mirror; 200, First imaging assembly; 210, Polarizer; 220, Collimation correction element; 230, Beam homogenizer; 240, Shaping lens; 250, Aperture group; 251, First aperture; 252, Second aperture; 260, Polarizing beam splitter; 270, Waveplate; 280, Terminal polarizer; 300, LCOS chip; 400, Second imaging assembly; 500, Stray light absorption structure; 500a, First light absorption structure; 500b, Second light absorption structure; 500c, Third light absorption structure; 510, Receiving element; 511, Reflecting cavity; 512, Reflecting groove; 520, Reflecting sheet; 530, One-way light-transmitting element; 600, Housing; 610, First partition plate; 620, Second partition plate; 630, Mounting cavity.

[0105] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0106] As described in the background section, in related technologies, a projection optical engine includes a light source assembly and an imaging structure arranged sequentially along the projection optical path to realize the imaging process of the projection optical engine. The light source assembly may include multiple light sources and dichroic mirrors. The light sources emit light towards the dichroic mirrors along the projection optical path. The dichroic mirrors can transmit part of the light and reflect part of the light according to factors such as the wavelength of the light, so that multiple dichroic mirrors can combine the light from multiple light sources to form a composite light, and make the composite light propagate along the projection optical path towards the imaging structure, thereby realizing the light combining process of multiple light sources through the dichroic mirrors.

[0107] For example, multiple light sources can be used to emit light of different wavelengths. Along the projected light path, a dichroic mirror can reflect light from the first part of the light source and transmit light from the second part of the light source. Thus, the dichroic mirror can change the propagation direction of light from the first part of the light source, allowing the light from multiple light sources to combine and form composite light.

[0108] Furthermore, the imaging structure may include a polarizing beam splitter (PBS). Along the projection optical path, the polarizing beam splitter can transmit the composite light from the light source components and form the projection light, thereby enabling the projection process of the projection optical engine.

[0109] However, because the light emitted by multiple light sources has overlapping wavelengths, some light wavelengths from different light sources may overlap. For example, along the projection light path, a dichroic mirror reflects light from the first part of the light source, but some light from the first part of the light source may pass through the dichroic mirror; a dichroic mirror passes light from the second part of the light source, but some light from the second part of the light source may be reflected by the dichroic mirror.

[0110] Furthermore, some light rays from the composite light source component will not pass through the polarizing beam splitter, but will be reflected by the polarizing beam splitter. In other words, the light rays from the first part of the light source that pass through the dichroic mirror, the light rays from the second part of the light source that are reflected by the dichroic mirror, and the part of the composite light rays from the light source component that are reflected by the polarizing beam splitter do not propagate along the projection light path, thus forming stray light that is different from the projection light.

[0111] It is easy to understand that during the use of a projection optical engine, the projection optical engine is prone to generating stray light that does not propagate along the projection optical path. Moreover, the propagation direction and wavelength of the stray light are difficult to control, which makes the projection light that propagates along the projection optical path susceptible to interference from the stray light, resulting in poor imaging effect of the projection optical engine.

[0112] To address the aforementioned technical problems, this application provides a projection optical engine and a vehicle. The projection optical engine includes a light source component and an imaging component arranged sequentially along the projection optical path. During the use of the projection optical engine, the light source component can emit light to the imaging structure, and at least a portion of the light can pass through the imaging structure along the projection optical path to form projection light, thereby enabling the projection optical engine to achieve imaging through the projection light.

[0113] During the use of a projection optical engine, some of the light emitted by the light source component deviates from the projection optical path, forming stray light. The stray light absorption structure of the projection optical engine is used to absorb stray light from the light source component that has not propagated along the projection optical path, thereby reducing the interference of stray light on the projection light propagating along the projection optical path and improving the imaging effect of the projection optical engine.

[0114] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0115] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0116] Referring to Figure 1, this application provides a projection optical engine, including a light source assembly 100 and an imaging structure arranged sequentially along the projection optical path (i.e., the optical path represented by the solid line in the figure). The light source assembly 100 emits light to the imaging structure, and at least a portion of the light passes through the imaging structure along the projection optical path to form projection light, thereby enabling the projection process of the projection optical engine.

[0117] The projection optical engine also includes at least one stray light absorption structure 500, which is used to absorb stray light (i.e., light rays represented by dashed lines in the figure) from the light source assembly 100 that does not propagate along the projection optical path, so as to reduce the interference of stray light on the projection light propagating along the projection optical path and improve the imaging effect of the projection optical engine.

[0118] For example, the projection engine can be configured as a Liquid Crystal on Silicon (LCOS) projection engine. A liquid crystal on silicon chip is a miniature display device used in display technology. It combines the characteristics of liquid crystal display technology and silicon-based integrated circuits, and has advantages such as high resolution, excellent image quality, miniaturization, and high flexibility.

[0119] In some possible implementations, the light source assembly 100 may include a light source 110. The number of light sources 110 may be set to at least one.

[0120] For example, referring to Figure 2, the number of light sources 110 can be set to one, with the light-emitting side of the light source facing the imaging structure. The light source 110 can emit light to the imaging component, so that the light can pass through the imaging component to form projection light. The projection optical engine can be used to form monochromatic projection light on the projection surface.

[0121] For example, referring to FIG3, the number of light sources 110 can be set to multiple, and the light source assembly 100 may include a dichroic mirror assembly, which includes a dichroic mirror 130. The light source 110 can emit light to the dichroic mirror 130 along the projection light path.

[0122] For example, the light source assembly 100 is configured as an inorganic light-emitting diode type light source assembly 100. For instance, the light source 110 may be selected from one or more of inorganic light-emitting diodes (LEDs), mini light-emitting diodes (Mini LEDs), and micro light-emitting diodes (Micro LEDs).

[0123] It should be noted that, compared with other types of light-emitting elements, the light source assembly 100 is set as an inorganic light-emitting diode type light source assembly 100. The light source assembly 100 has higher impact resistance and reliability, and can be applied to more application scenarios, ensuring the normal use of the light source assembly 100.

[0124] The light source assembly 100 includes a plurality of light sources 110 and a dichroic mirror assembly, wherein the light sources 110 emit light along the projection light path toward the dichroic mirror assembly.

[0125] Inorganic light-emitting diodes (LEDs) are a new type of energy-saving light source 110. Compared with traditional light sources 110, they have a compact structure and low cost. When used as a projection light source 110, there is no need to extract the basic color from white light. Inorganic LEDs are surface light sources 110, which can be regarded as a collection of countless point light sources 110. Therefore, their luminous intensity is approximately equal in all directions.

[0126] Referring to Figures 2 and 3, the light source assembly 100 may, by way of example, include a collimator 120. Along the projection light path, the collimator 120 may be disposed between the light source 110 and the dichroic mirror 130, so that the light emitted from the light source 110 can propagate along the projection light path to the dichroic mirror 130 through the collimator 120.

[0127] Collimator 120 can be configured as one or more of a compound parabolic concentrator (CPC), a collimating lens, and a total internal reflection lens (TIR).

[0128] For example, the collimator 120 can be configured as a collimating lens to reduce the size of the collimator 120, making the collimator 120 applicable to more types of projection optical engines. In addition, it can make the light spot formed from the light source 110 and passing through the collimator 120 more uniform, thereby improving the light emission effect of the light source assembly 100.

[0129] Collimator 120 can shape the light from light source 110 to change the divergence angle or convergence angle of the light, so that the light can propagate along the projection light path and reduce the possibility of the light deviating from the projection light path.

[0130] For example, the dichroic mirror 130 of the light source assembly 100 can at least be used to combine light rays from multiple light sources 110 to form composite light, and to propagate the composite light along the projection light path to the imaging structure, thereby realizing the light combining process of different wavelengths of light rays from multiple light sources 110.

[0131] A dichroic mirror 130, also known as a dichroic mirror or dichroic mirror, is a common optical element that can be used to reflect or transmit light according to its wavelength or color.

[0132] For example, a dichroic mirror 130 can be designed to reflect light within a specific wavelength range while transmitting light of other wavelengths, thereby enabling the deflection of light streams to regulate the light propagation process.

[0133] Referring to FIG4, in some possible embodiments, along the projection light path, the dichroic mirror 130 reflects the light from the first partial light source 110 and transmits the light from the second partial light source 110, thereby enabling the dichroic mirror 130 to change the light propagation direction of the first partial light source 110.

[0134] The position of the dichroic mirror 130 can be adjusted according to the position and light emission direction of the multiple light sources 110, so that the dichroic mirror 130 can deflect the light from the first part of the light sources 110, thereby combining the light from different light sources 110 to form composite light.

[0135] Referring to Figures 3 and 4, by way of example, the multiple light sources 110 may include a first light source 110a and a second light source 110b with different emission wavelengths. The first light source 110a emits light of a first wavelength, and the second light source 110b emits light of a second wavelength. The first wavelength light and the second wavelength light can be combined to form composite light.

[0136] The first surface of the dichroic mirror 130 is positioned facing the first light source 110a, and the second surface of the dichroic mirror 130 is positioned facing the second light source 110b.

[0137] The light emission direction of the first light source 110a can be set perpendicular to the light emission direction of the second light source 110b, and the angle between the light emission direction of the first light source 110a and the dichroic mirror 130 can be set to 45 degrees, and the angle between the light emission direction of the second light source 110b and the dichroic mirror 130 can be set to 45 degrees.

[0138] The first light source 110a can be configured as the first partial light source 110 described above. Along the projection light path, light of the first wavelength is reflected by the dichroic mirror 130 and then propagates to the imaging structure. The second light source 110b can be configured as the second partial light source 110. Along the projection light path, light of the second wavelength is transmitted through the dichroic mirror 130 and propagates to the imaging structure.

[0139] As shown in Figure 4, the dichroic mirror 130 can be tilted. The dichroic mirror 130 has a first surface and a second surface opposite to the first surface. A first light source 110a can be disposed on the first surface side of the dichroic mirror 130, and a second light source 110b can be disposed on the second surface side of the dichroic mirror 130.

[0140] When light passes through the dichroic mirror 130, the light can propagate from the side where the first surface of the dichroic mirror 130 is located to the side where the second surface of the dichroic mirror 130 is located. Alternatively, the light can propagate from the side where the second surface of the dichroic mirror 130 is located to the side where the first surface of the dichroic mirror 130 is located.

[0141] For example, the first surface of the dichroic mirror 130 faces left and upward, and the second surface faces right and downward. A first light source 110a is disposed on the left side of the dichroic mirror 130, emitting light onto the first surface of the dichroic mirror 130. A second light source 110b is disposed on the lower side of the dichroic mirror 130, emitting light onto the second surface of the dichroic mirror 130.

[0142] When the light source assembly 100 is in operation, the first light source 110a emits a first wavelength light to the right dichroic mirror 130, and the dichroic mirror 130 reflects the first wavelength light from the first light source 110a, so that the first wavelength light can propagate upward after being reflected by the dichroic mirror 130 to form projection light.

[0143] The second light source 110b emits a second wavelength of light upward toward the dichroic mirror 130. The dichroic mirror 130 transmits the second wavelength of light from the second light source 110b, allowing the second wavelength of light to continue to propagate upward through the dichroic mirror 130. The second wavelength of light and the first wavelength of light can combine to form composite light.

[0144] It is easy to understand that, since the light emitted by multiple light sources 110 has overlapping wavelengths, different light sources 110 will produce some overlapping light wavelengths.

[0145] For example, light from the first partial light source 110 may pass through the dichroic mirror 130 and form stray light that does not propagate along the projection light path. Light from the second partial light source 110 may be reflected by the dichroic mirror 130 and form stray light that does not propagate along the projection light path.

[0146] In some possible implementations, the stray light absorption structure 500 can absorb light from the first partial light source 110 that has passed through the dichroic mirror 130. The stray light absorption structure 500 can also absorb light from the second partial light source 110 that has been reflected by the dichroic mirror 130, thereby reducing the interference of stray light on the projection effect of the projection optical engine.

[0147] For example, the stray light absorption structure 500 can be disposed on the second surface side of the dichroic mirror 130, and the incident light side of the stray light absorption structure 500 can be disposed toward the second surface of the dichroic mirror 130.

[0148] The stray light absorption structure 500 can absorb light from the first light source 110a that has passed through the dichroic mirror 130. The stray light absorption structure 500 can also absorb light from the second light source 110b that has been reflected by the dichroic mirror 130, thereby removing stray light generated by the light source assembly 100.

[0149] Referring to Figures 5 and 6, in some possible embodiments, the plurality of light sources 110 may include a first light source 110a, a second light source 110b, and a third light source 110c with different emission wavelengths.

[0150] The first light source 110a can emit light of the first wavelength, the second light source 110b can emit light of the second wavelength, and the third light source 110c can emit light of the third wavelength.

[0151] The first wavelength light, the second wavelength light, and the third wavelength light can be combined by the dichroic mirror 130 to form a composite light, which then propagates along the projection light path toward the imaging structure.

[0152] The first light source 110a can be set to a blue light source 110, and the first wavelength of light can be set to blue light. The second light source 110b can be set to a red light source 110, and the second wavelength of light can be set to red light. The third light source 110c can be set to a green light source 110, and the third wavelength of light can be set to green light. The blue light, red light, and green light can form a composite light along the projection light path.

[0153] For example, the number of dichroic mirrors 130 can be set to multiple, and the multiple dichroic mirrors 130 may include a first dichroic mirror 130a and a second dichroic mirror 130b arranged in sequence, so as to realize the light combining process of a first wavelength light, a second wavelength light and a third wavelength light through the cooperating first dichroic mirror 130a and second dichroic mirror 130b.

[0154] The first dichroic mirror 130a and the second dichroic mirror 130b are arranged parallel to each other. The first surface of the first dichroic mirror 130a faces to the left and upward, and the second surface of the first dichroic mirror 130a faces to the right and downward. The first surface of the second dichroic mirror 130b faces to the left and upward, and the second surface of the second dichroic mirror 130b faces to the right and downward.

[0155] The first light source 110a is disposed on the left side of the first dichroic mirror 130a, and the first light source 110a is disposed on the first surface side of the first dichroic mirror 130a, and the first light source 110a emits light onto the first surface of the first dichroic mirror 130a.

[0156] The second light source 110b is disposed on the lower side of the first dichroic mirror 130a, and the second light source 110b is disposed on the second surface side of the first dichroic mirror 130a. The second light source 110b emits light to the second surface of the dichroic mirror 130a.

[0157] The light emission direction of the first light source 110a is perpendicular to the light emission direction of the second light source 110b. The light emission direction of the second light source 110b is parallel to the light emission direction of the third light source 110c.

[0158] The third light source 110c is disposed below the second dichroic mirror 130b, and the third light source 110c emits light onto the second surface of the second dichroic mirror 130b.

[0159] For example, the first dichroic mirror 130a can transmit light of a first wavelength and reflect light of a second wavelength. The second dichroic mirror 130b can reflect light of the first wavelength and the second wavelength, and reflect light of a third wavelength.

[0160] Along the projection light path, the first wavelength light from the first light source 110a can pass through the first dichroic mirror 130a and be reflected by the second dichroic mirror 130b before propagating to the imaging structure.

[0161] Along the projection light path, the second wavelength light from the second light source 110b can be reflected by the first dichroic mirror 130a and then by the second dichroic mirror 130b before propagating toward the imaging structure.

[0162] Along the projection light path, the third wavelength light from the third light source 110c can propagate through the rear imaging structure of the second dichroic mirror 130b.

[0163] For example, when the light source assembly 100 is in operation, the first light source 110a emits a first wavelength light to the right toward the first dichroic mirror 130a. The first wavelength light can propagate through the first dichroic mirror 130a toward the second dichroic mirror 130b. The wavelength of the first wavelength light can propagate upward after being reflected by the second dichroic mirror 130b, so that the first wavelength light can propagate upward after passing through the first dichroic mirror 130a and the second dichroic mirror 130b.

[0164] The second light source 110b emits a second wavelength of light upward toward the first dichroic mirror 130a. After being reflected by the first dichroic mirror 130a, the second wavelength of light propagates toward the second dichroic mirror 130b. The wavelength of the second wavelength of light can propagate upward after being reflected by the second dichroic mirror 130b, so that the second wavelength of light can propagate upward after passing through the first dichroic mirror 130a and the second dichroic mirror 130b.

[0165] The third light source 110c emits a third wavelength of light upwards toward the second dichroic mirror 130b. The second dichroic mirror 130b transmits the third wavelength of light from the third light source 110c, allowing the third wavelength of light to continue to propagate upwards through the second dichroic mirror 130b, thereby enabling the first wavelength of light, the second wavelength of light, and the third wavelength of light to combine and form composite light.

[0166] In some possible implementations, the number of stray light absorbing structures 500 can be set to one or more. For example, the number of stray light absorbing structures 500 can be set to one, and one stray light absorbing structure 500 can be used to absorb stray light generated at one or more locations.

[0167] Alternatively, the number of stray light absorption structures 500 can be set to multiple, and multiple stray light absorption structures 500 can be used to absorb stray light generated at multiple locations. Multiple stray light absorption structures 500 can be arranged sequentially along the projection optical path, and multiple stray light absorption structures 500 are used to absorb stray light generated at different locations in the projection optical path, so as to improve the absorption and processing effect of stray light by the stray light absorption structures 500 and improve the projection effect of the projection optical engine.

[0168] For example, the number of stray light absorption structures 500 can be set to multiple. The stray light absorption structure 500 may include a first light-absorbing structure 500a.

[0169] The first light-absorbing structure 500a can be positioned above the first dichroic mirror 130a on the first surface of the first dichroic mirror 130a. The first light-absorbing structure 500a absorbs the first wavelength light reflected by the first dichroic mirror 130a and absorbs the second wavelength light transmitted through the first dichroic mirror 130a.

[0170] It is easy to understand that the second light source 110b is set as the first part of the light source 110 corresponding to the first light-absorbing structure 500a, and the first light source 110a is set as the second part of the light source 110 corresponding to the first light-absorbing structure 500a.

[0171] For example, light of a first wavelength from the first light source 110a may be reflected by the first dichroic mirror 130a and form stray light that does not propagate along the projection path. Light of a second wavelength from the second light source 110b may pass through the first dichroic mirror 130a and form stray light that does not propagate along the projection path.

[0172] The first light-absorbing structure 500a absorbs the first wavelength light reflected by the first dichroic mirror 130a and absorbs the second wavelength light transmitted through the first dichroic mirror 130a, thereby enabling the first light-absorbing structure 500a to absorb some stray light from the first light source 110a and the second light source 110b.

[0173] For example, the number of stray light absorption structures 500 can be set to multiple. The stray light absorption structure 500 includes a second light-absorbing structure 500b.

[0174] The second light-absorbing structure 500b can absorb the first wavelength light and the second wavelength light transmitted through the second dichroic mirror 130b to the second surface of the second dichroic mirror 130b, and absorb the third wavelength light reflected by the second dichroic mirror 130b.

[0175] It is easy to understand that the first light source 110a and the second light source 110b are set as the first part of the light source 110 corresponding to the second light-absorbing structure 500b, and the third light source 110c is set as the second part of the light source 110 corresponding to the second light-absorbing structure 500b.

[0176] For example, light of a first wavelength from the first light source 110a may be reflected by the second dichroic mirror 130b, forming stray light that does not propagate along the projection path. Light of a second wavelength from the second light source 110b may be reflected by the second dichroic mirror 130b, forming stray light that does not propagate along the projection path. Light of a third wavelength from the third light source 110c may be reflected by the second dichroic mirror 130b, forming stray light that does not propagate along the projection path.

[0177] The second light-absorbing structure 500b can absorb the first wavelength light and the second wavelength light transmitted through the second dichroic mirror 130b, and absorb the third wavelength light reflected by the second dichroic mirror 130b. Thus, the second light-absorbing structure 500b can absorb some stray light from the first light source 110a, the second light source 110b and the third light source 110c.

[0178] By adopting the above technical solution, during the use of the projection optical engine, some of the light emitted by the light source component 100 deviates from the projection optical path and forms stray light. The stray light absorption structure 500 is used to absorb the stray light from the light source component 100 that does not propagate along the projection optical path, thereby reducing the interference of stray light on the projection light propagating along the projection optical path and improving the imaging effect of the projection optical engine.

[0179] Referring to Figures 6 and 7, in some possible embodiments, the imaging structure may include a first imaging component 200 and a second imaging component 400 arranged sequentially along the projection optical path.

[0180] The first imaging component 200 can at least be used to adjust and shape the composite light from the light source component 100. The second imaging component 400 can at least be used to deflect and adjust the composite light from the first imaging component 200 so that the composite light can form projection light.

[0181] For example, the first imaging component 200 may include a polarizer 210. The polarizer 210 may be used to receive composite light from the light source component 100, and the polarizer 210 may be used to polarize the composite light from the light source component 100.

[0182] The processor of the silicon-based liquid crystal projection optical engine (hereinafter referred to as LCOS chip 300) can be used to modulate the projected image and modulate the polarization state of the projected image signal to an S-polarization state. Therefore, before the composite light reaches LCOS chip 300, the composite light can be polarized by polarizer 210 to form P-polarized light with extremely high purity, thereby improving the contrast of the projected image and improving the display effect of the projected image.

[0183] In the light source assembly 100, the collimator 120 collimates the light from multiple light sources 110, resulting in a smaller incident angle for the composite light. Since the polarization degree of the composite light depends on the incident angle between the incident light and the polarizer, the smaller incident angle of the composite light also results in relatively high purity of the P-polarized light after polarization processing by the polarizer 210.

[0184] For example, the first imaging assembly 200 may include a collimation correction element 220. Along the projection optical path, the collimation correction element 220 may be disposed on the side of the polarizer 210 away from the light source assembly 100, and the collimation correction element 220 may be used to receive composite light from the polarizer 210.

[0185] The radius of curvature of the collimation correction element 220 can be greater than or equal to 51 mm and less than or equal to 56 mm. For example, the radius of curvature of the collimation correction element 220 can be set to one of 51 mm, 52 mm, 53 mm, 54 mm, 55 mm and 56 mm.

[0186] The thickness of the collimation correction element 220 is greater than or equal to 1 mm and less than or equal to 3 mm. For example, the thickness of the collimation correction element 220 can be set to one of 1 mm, 1.5 mm, 2 mm, 2.5 mm and 3 mm.

[0187] The collimation correction element 220 can correct the composite light from the polarizer 210, thereby improving the uniformity of the composite light and making the light spot formed by the composite light to the subsequent homogenizer 230 more uniform, thus improving the display effect of the projected image of the projection optical engine.

[0188] Referring to Figures 7-9, the first imaging component 200 may, by way of example, include a light homogenizer 230. The light homogenizer 230 can improve the uniformity of the composite light and enhance the uniformity of the light spot formed by the composite light.

[0189] The beam homogenizer 230 can be configured as an integrating bar or a compound eye lens. The integrating bar homogenizes the beam based on the principle of angular overlap, while the compound eye lens homogenizes the beam based on the method of spatial overlap.

[0190] For example, the light homogenizer 230 can be configured as a compound eye lens to homogenize the composite light, thereby reducing the volume of the light homogenizer 230 and the assembly space required for the light homogenizer 230.

[0191] A compound eye lens can consist of several miniature rectangular lenses. A compound eye lens is also known as a fly-eye lens. Each miniature rectangular lens can have a plano-convex lens structure, and the aperture of the rectangular lens can be rectangular. The aspect ratio of the aperture of the rectangular lens can be set to 4:3 or 16:9.

[0192] For example, the entire compound eye lens is composed of two symmetrical microlens arrays. Among them, Fly-eye Lens arrays #1, where parallel light is incident, is the anterior compound eye lens array, and Fly-eye Lens arrays #2, where light exits, is the posterior compound eye lens array.

[0193] The distance between #1 and #2 is equal to the focal length f of the microlens, and the center of the microlens in #2 is located at the focal point of the corresponding single microlens in #1. Because a condenser lens is added after the compound eye lens system to focus the beam, the small beams emitted from the single microlens overlap on the screen, and the uniformity of the multiple small beams is greater than the uniformity of the entire wide beam.

[0194] Compound eye lenses employ a symmetrical structure, which allows tiny beams of light with varying uniformity to overlap and compensate for each other, ultimately achieving a uniform light effect.

[0195] A compound eye lens may comprise two symmetrical microlens arrays. Alternatively, a compound eye lens may be configured as a monolithic compound eye lens, in which two microlens arrays are combined into one, with no air gap between them.

[0196] Integral compound eye lenses can be made of polymethyl methacrylate (PMMA), which simplifies the design process, reduces the manufacturing cost, and minimizes spatial errors caused by the assembly of dual microlens arrays.

[0197] For example, the first imaging component 200 may include a shaping lens 240. Along the projection optical path, the shaping lens 240 is capable of beam-contracting the composite light from the homogenizer 230 so that the composite light from the homogenizer 230 can be adapted to the size of the subsequent LCOS chip 300.

[0198] The first imaging component 200 may include an aperture group 250. Along the projection optical path, the aperture group 250 can be used to receive composite light from the shaping lens 240, and the aperture group 250 can be used to adjust and improve the collimation and stray light of the composite light so that the composite light can be used in the subsequent LCOS chip 300.

[0199] The aperture group 250 may include a first aperture 251 and a second aperture 252 arranged sequentially at intervals along the projection light path. The opening size of the first aperture 251 may be larger than the opening size of the second aperture 252, so as to filter out different light spots through the cooperating first aperture 251 and second aperture 252, thereby adjusting and improving the collimation and stray light of the composite light.

[0200] In some possible implementations, the first imaging assembly 200 may include a polarizing beam splitter 260 (PBS). The second surface of the polarizing beam splitter 260 faces the second imaging assembly 400.

[0201] The polarizing beam splitter 260 can be used to receive light from the aperture group 250 and can be used to transmit the first part of the polarized light and reflect the second part of the polarized light.

[0202] The polarizing beam splitter 260 can be shaped like a sheet. The polarizing beam splitter 260 may include a polarizing beam splitting film, which is made of one of the following materials: metal wire grid, organic material, and inorganic material, to make the structure of the polarizing beam splitter 260 more reliable and enable the projection optical engine to meet automotive operating conditions.

[0203] It is easy to understand that when light from the light source assembly 100 passes through the polarizer 210, the polarizer 210 can polarize the light, so that the light forms a first part of polarized light and a second part of polarized light.

[0204] For example, the first part of the polarized light can be set as P-polarized light (i.e., parallel linearly polarized light, where the polarization vector of the light ray is in the plane of incident light and reflected light), and the second part of the polarized light can be set as S-polarized light (i.e., perpendicular linearly polarized light, where the polarization vector of the light ray is perpendicular to the plane of incident light and reflected light).

[0205] For example, the polarizing beam splitter 260 is used to transmit a first portion of polarized light from the light source assembly 100 and propagate the first portion of polarized light toward the second imaging assembly 400. The polarizing beam splitter 260 is also used to reflect a second portion of polarized light from the light source assembly 100, thereby achieving the separation of the first and second portions of polarized light in the light.

[0206] The polarizing beam splitter 260 can be tilted. Along the projection light path, the first surface of the polarizing beam splitter 260 faces to the right and downward, and the first surface of the polarizing beam splitter 260 faces the light source assembly 100. The second surface of the polarizing beam splitter 260 faces to the left and upward, and the second surface of the polarizing beam splitter 260 faces the second imaging assembly 400.

[0207] It should be noted that, along the projection light path, most of the propagation medium between the shaping lens 240 and the polarizing beam splitter 260 is air. When designing the first imaging component 200, it is necessary to appropriately lengthen the back focal length to ensure that when the first part of the polarized light reaches the surface of the LCOS chip 300, the spot of the first part of the polarized light matches the size of the LCOS chip 300.

[0208] The second part of the polarized light after being reflected by the polarizing beam splitter 260 is stray light. The stray light absorption structure 500 is used to absorb the second part of the polarized light after being reflected by the polarizing beam splitter 260, so as to reduce the interference of the second part of the polarized light on the first part of the polarized light in the projection optical path.

[0209] For example, the stray light absorption structure 500 is used to absorb the S-polarized light reflected by the polarizing beam splitter 260, thereby enabling the separation of the first part of the polarized light and the second part of the polarized light in the light by means of the matching polarizing beam splitter 260 and stray light absorption structure 500.

[0210] Referring to Figures 7 and 10, by way of example, the first imaging component 200 includes a waveplate 270, which may be a quarter-wave plate 270.

[0211] For example, the first imaging component 200 includes a terminal polarizer 280.

[0212] The angle between the optical axis of waveplate 270 and terminal polarizer 280 can be 0°. At this time, P-polarized light is incident on polarizer 260, transmitted to LCOS chip 300, modulated by LCOS chip 300 into S-light incident on polarizer 260, and then reflected by polarizer 260 to terminal polarizer 280.

[0213] The polarized light emitted after modulation by the LCOS chip 300 contains a large amount of S-polarized light and a small amount of light with other polarization states. When passing through waveplate 270, since the vibration direction of the S-polarized light makes an angle of 0° with the slow axis of waveplate 270, the S-polarized light does not change its polarization state as it passes through waveplate 270. Light with other polarization states is converted into elliptically polarized light after passing through waveplate 270.

[0214] Since the polarizing beam splitter 260 allows P-polarized light to pass through and reflects S-polarized light and other polarized light, the S-polarized light and elliptically polarized light emitted from the waveplate 270 can be reflected by the polarizing beam splitter 260 to the terminal polarizer 280.

[0215] Furthermore, since the terminal polarizer 280 allows S-polarized light to pass through while blocking P-polarized light and other polarization states, the S-polarized light emitted from the polarizer 260 can pass through the terminal polarizer 280, while the elliptically polarized light will be blocked by the terminal polarizer 280, thus not affecting the image quality and achieving the purpose of improving the contrast of the projected image.

[0216] In some possible implementations, the second imaging component 400 may be configured as a projection lens. The projection lens may include a first lens group, a third aperture, and a second lens group arranged sequentially along the projection optical path.

[0217] Along the projection light path, the second imaging component 400 and the light source component 100 are located at opposite ends of the first imaging component 200.

[0218] The first lens group can at least be used to refract the first image light and emit the second image light to the third aperture. The third aperture is used to transmit the second image light and allow it to propagate along the projection light path to the second lens group. The second lens group is used to refract the second image light and emit the third image light that propagates along the projection light path.

[0219] Referring to Figure 4, the following describes the absorption method of stray light that does not propagate along the projection light path by the projection optical path and stray light absorption structure 500 in the projection optical engine, taking the light source assembly 100 including a first light source 110a, a second light source 110b, a third light source 110c, a first dichroic mirror 130a, and a second dichroic mirror 130b as an example.

[0220] For example, when the light source assembly 100 is in operation, the first light source 110a emits a first wavelength light to the right toward the first dichroic mirror 130a. The first wavelength light can propagate through the first dichroic mirror 130a toward the second dichroic mirror 130b. The wavelength of the first wavelength light can propagate upward after being reflected by the second dichroic mirror 130b, so that the first wavelength light can propagate upward after passing through the first dichroic mirror 130a and the second dichroic mirror 130b.

[0221] The second light source 110b emits a second wavelength of light upward toward the first dichroic mirror 130a. After being reflected by the first dichroic mirror 130a, the second wavelength of light propagates toward the second dichroic mirror 130b. The wavelength of the second wavelength of light can propagate upward after being reflected by the second dichroic mirror 130b, so that the second wavelength of light can propagate upward after passing through the first dichroic mirror 130a and the second dichroic mirror 130b.

[0222] The third light source 110c emits a third wavelength of light upwards toward the second dichroic mirror 130b. The second dichroic mirror 130b transmits the third wavelength of light from the third light source 110c, allowing the third wavelength of light to continue to propagate upwards through the second dichroic mirror 130b, thereby enabling the first wavelength of light, the second wavelength of light, and the third wavelength of light to combine and form composite light.

[0223] The first light-absorbing structure 500a absorbs the first wavelength light reflected by the first dichroic mirror 130a and absorbs the second wavelength light transmitted through the first dichroic mirror 130a, thereby enabling the first light-absorbing structure 500a to absorb some stray light from the first light source 110a and the second light source 110b.

[0224] The second light-absorbing structure 500b can absorb the first wavelength light and the second wavelength light transmitted through the second dichroic mirror 130b, and absorb the third wavelength light reflected by the second dichroic mirror 130b. Thus, the second light-absorbing structure 500b can absorb some stray light from the first light source 110a, the second light source 110b and the third light source 110c.

[0225] The transmission axis of the polarizer 210 is the P-light transmission axis. After the composite light at a small angle is incident on the polarizer 210 and converted into P-polarized light, the incident angle of the P-polarized light is adjusted by the collimation correction element 220, so that the P-polarized light can propagate along the projection light path.

[0226] The homogenizer 230 can integrate P-polarized light by superimposing small beams of P-polarized light with different uniformity, thereby compensating for each other. The homogenizer 230 can adjust the beam size of the P-polarized light to conform to the size of the LCOS chip 300.

[0227] The polarizing beam splitter 260 can transmit P-polarized light and reflect S-polarized light. The P-polarized light passes through the waveplate 270 and is then incident on the LCOS chip 300. After being modulated into S-polarized light by the LCOS chip 300, it is reflected back to the waveplate 270.

[0228] In this design, the fast axis of waveplate 270 is parallel to the vibration axis of the S-polarized light reflected from the loop, allowing the S-polarized light to pass through without changing its polarization state. Meanwhile, light rays of other polarization states are converted into circularly polarized light during transmission because their vibration axes are not parallel to the fast axis of waveplate 270.

[0229] Because the transmission axis of the P-polarized light (i.e., the P-beam in Figure 4) transmitted from the beam splitter 260 is not parallel, the S-polarized light (i.e., the S-beam in Figure 4) transmitted from the waveplate 270 and other polarized light cannot pass through. As a result, they are reflected to the terminal polarizer 280, which has the transmission axis of the S-polarized light. This allows the S-polarized light reflected from the loop to be imaged and projected into the second imaging assembly 400 along the projection light path, while other polarized light cannot pass through the terminal polarizer 280.

[0230] In some possible implementations, the number of stray light absorbing structures 500 can be set to one or more. Referring to FIG11, when the number of stray light absorbing structures 500 is set to multiple, the multiple stray light absorbing structures 500 can be arranged sequentially along the projection optical path so as to absorb and process stray light that does not propagate along the projection optical path from different positions of the multiple stray light absorbing structures 500.

[0231] For example, the number of stray light absorption structures 500 can be set to one.

[0232] When the light source assembly 100 includes a light source 110, the light source 110 can emit light to the first imaging assembly 200, so that the light can form a first part polarized light and a second part polarized light. The stray light absorption structure 500 is used to absorb the second part polarized light after being reflected by the polarizing beam splitter 260.

[0233] For example, the number of stray light absorption structures 500 can be set to multiple.

[0234] When the light source assembly 100 includes multiple light sources 110 and dichroic mirrors 130, the multiple stray light absorption structures 500 may include a first light-absorbing structure 500a, a second light-absorbing structure 500b, and a third light-absorbing structure 500c. The positions of the first light-absorbing structure 500a and the second light-absorbing structure 500b are as described above, and will not be repeated here in this embodiment.

[0235] The third light-absorbing structure 500c can be used to absorb the second part of the polarized light after reflection by the polarizing beam splitter 260, so as to reduce the interference of the second part of the polarized light on the first part of the polarized light in the projection optical path.

[0236] It is easy to understand that at least two of the first light-absorbing structure 500a, the second light-absorbing structure 500b, and the third light-absorbing structure 500c can be integrated into an integrated absorption structure. The integrated absorption structure can be used to absorb stray light at at least several positions in the projection light path, so as to reduce the number of stray light absorption structures 500.

[0237] For example, the stray light absorption structure 500 may include a first light-absorbing structure 500a, a second light-absorbing structure 500b, and a third light-absorbing structure 500c.

[0238] The first light-absorbing structure 500a and the second light-absorbing structure 500b can be arranged on opposite sides relative to the imaging structure. The first light-absorbing structure 500a and the third light-absorbing structure 500c can be arranged on opposite sides relative to the imaging structure. The second light-absorbing structure 500b and the third light-absorbing structure 500c can be arranged on the same side relative to the imaging structure.

[0239] When the stray light absorption structure 500 includes the first light absorption structure 500a, the first light absorption structure 500a is located on the first side of the first imaging component 200, and the first light absorption structure 500a is located at the end of the first imaging component (200) near the light source component 100.

[0240] When the stray light absorption structure 500 includes a second light-absorbing structure 500b, the second light-absorbing structure 500b is located on the second side of the first imaging component 200. The second light-absorbing structure 500b is located at the end of the first imaging component 200 near the light source component 100.

[0241] The third light-absorbing structure 500c is disposed on the side of the second light-absorbing structure 500b away from the light source assembly 100. Along the projection light path, stray light from the light source assembly 100 can be absorbed sequentially by the first light-absorbing structure 500a, the second light-absorbing structure 500b and the third light-absorbing structure 500c, thereby improving the absorption effect of the stray light absorption structure 500 on stray light.

[0242] The third light-absorbing structure 500c is located on the second side of the first imaging component 200. The third light-absorbing structure 500c is located at the end of the first imaging component 200 that is away from the light source component 100.

[0243] In some possible implementations, the stray light absorption structure 500 may include a receiving member 510 and a one-way light-transmitting member 530. The receiving member 510 may form a reflecting cavity 511 having an opening toward the projection light path so that stray light that does not propagate along the projection light path can enter the reflecting cavity 511 through the opening.

[0244] For example, the one-way light-transmitting element 530 can be disposed in the opening. The one-way light-transmitting element 530 is suitable for transmitting stray light toward the reflection cavity 511 and blocking light propagating from the reflection cavity 511 to the projection light path, so as to reduce the possibility of light in the reflection cavity 511 passing through the projection light path.

[0245] When the stray light absorption structure 500 absorbs and processes stray light from the light source assembly 100 that does not propagate along the projection light path, the stray light can enter the reflection cavity 511 through the one-way light transmission element 530. The stray light is reflected by the cavity wall of the reflection cavity 511, causing the stray light to gradually attenuate within the reflection cavity 511. The one-way light transmission element 530 can block stray light propagating from the reflection cavity 511 to the projection light path, thereby reducing the interference of stray light on the light propagating along the composite light path.

[0246] Referring to FIG12, exemplarily, the unidirectional light-transmitting element 530 can be configured such that the transmittance of light at a large incident angle is less than that of light at a small incident angle. The reflecting cavity 511 can at least be used to deflect stray light to increase the incident angle of stray light within the reflecting cavity 511.

[0247] For example, the transmittance of light by the one-way light-transmitting element 530 can be shown in Figure 12, where the x-axis represents the incident angle of the light and the y-axis represents the average transmittance of the one-way light-transmitting element 530. When the incident angle of the light is small, the transmittance of light by the one-way light-transmitting element 530 is high; when the incident angle of the light is large, the transmittance of light by the one-way light-transmitting element 530 is low.

[0248] When stray light enters the reflecting cavity 511 through the one-way light-transmitting element 530, the stray light is reflected by the cavity wall of the reflecting cavity 511, causing the stray light to gradually attenuate within the reflecting cavity 511 and its energy to gradually decrease. Furthermore, the reflecting cavity 511 can deflect the stray light, causing it to be reflected by the inner wall of the reflecting cavity 511, thereby increasing the incident angle of the stray light within the reflecting cavity 511 and further reducing the likelihood of the stray light passing through the one-way light-transmitting element 530.

[0249] For example, at least a portion of the cavity wall of the reflecting cavity 511 may be provided with a reflecting groove 512, which is used to increase the incident angle of stray light.

[0250] By setting a reflection groove 512 on the cavity wall of the reflection cavity 511, when stray light propagates to the reflection groove 512, the stray light will be scattered at the reflection groove 512. The reflection groove 512 can further increase the incident angle of the stray light, thereby improving the absorption and processing effect of the stray light absorption structure 500 on the stray light.

[0251] The stray light absorption structure 500 may also include a reflector 520. The reflector 520 may be disposed in the reflective cavity 511. The reflector 520 is used to deflect stray light transmitted through the one-way light-transmitting element 530 toward the reflective groove 512, so that the stray light can be reflected by the reflector 520 and then propagate toward the reflective groove 512, thereby increasing the incident angle of the stray light.

[0252] For example, in the first light-absorbing structure 500a, the opening faces downward, the reflective sheet 520 can be tilted, the reflective surface of the reflective sheet 520 faces left and downward, and the reflective groove 512 can be located at least on the left side of the reflective sheet 520. The reflective sheet 520 can reflect stray light from the dichroic mirror 130 that has not propagated along the projection light path, allowing the stray light to propagate to the left towards the reflective groove 512, thereby causing the stray light to be scattered at the reflective groove 512.

[0253] For example, in the second light-absorbing structure 500b, the opening faces to the left, the reflective sheet 520 can be tilted, the reflective surface of the reflective sheet 520 faces to the left and upward, and the reflective groove 512 can be disposed at least above the reflective sheet 520. The reflective sheet 520 can reflect stray light from the dichroic mirror 130 that has not propagated along the projection light path, allowing the stray light to propagate upward toward the reflective groove 512, thereby causing the stray light to be scattered at the reflective groove 512.

[0254] For example, in the third light-absorbing structure 500c, the opening faces to the left, the reflective sheet 520 can be tilted, the reflective surface of the reflective sheet 520 faces to the left and downward, and the reflective groove 512 can be located at least below the reflective sheet 520. The reflective sheet 520 can reflect stray light from the polarizing beam splitter 260 that has not propagated along the projection light path, allowing the stray light to propagate downward toward the reflective groove 512, thereby causing the stray light to be scattered at the reflective groove 512.

[0255] For example, referring to Figures 11 and 13, the number of openings in the same stray light absorption structure 500 can be set to multiple, with the multiple openings pointing to different positions of the projection light path.

[0256] The number of one-way light-transmitting elements 530 can be set to multiple, and the one-way light-transmitting elements 530 are set at the corresponding openings, so that stray light from different positions of the projection light path can be absorbed by a stray light absorption structure 500, thereby reducing the number of stray light absorption structures 500 and improving the absorption efficiency of stray light by the stray light absorption structure 500.

[0257] Referring to Figures 11 and 13, in some possible embodiments, the projection optical engine may further include a housing 600. The light source assembly 100 and the imaging structure are disposed in the housing 600, which can provide certain support and fixation for the light source assembly 100 and the imaging structure, thereby making the installation of the light source assembly 100 and the imaging structure more stable.

[0258] For example, the light source assembly 100 and the first imaging assembly 200 in the imaging structure can be disposed inside the housing 600, and the first imaging assembly 200 can be configured as an intracavity imaging assembly. The second imaging assembly 400 in the imaging structure can be disposed outside the housing 600, and the second imaging assembly 400 can be configured as an extracavity imaging assembly.

[0259] The stray light absorption structure 500 can be disposed in the housing 600. For example, the receiving member 510 can be disposed inside the housing 600, with the opening of the receiving member 510 facing the projection light path. Alternatively, the receiving member 510 can be disposed outside the housing 600, with the opening of the receiving member 510 facing the projection light path.

[0260] The housing 600 can be reused to form at least a portion of the stray light absorption structure 500, so that the stray light absorption structure 500 can be integrated into the housing 600. The housing 600 can be reused to form a partial receiving member 510, thereby enabling the housing 600 to enclose a partial reflecting cavity 511, thus enriching the functionality of the housing 600.

[0261] For example, the housing 600 may be provided with a first partition plate 610, which may at least be used to form a partial receiving member 510. A first surface of the first partition plate 610 and the housing 600 form a reflective cavity 511. A second surface of the first partition plate 610 and the housing 600 form a mounting cavity 630, which is used to accommodate a partial imaging structure.

[0262] The first surface of the first partition plate 610 may be provided with a reflective groove 512, which is used to increase the incident angle of stray light. The second surface of the first partition plate 610 may be used to form a mounting cavity 630, which may at least be used to set up a projection light path.

[0263] The first partition plate 610 can be used to form at least one of the second light-absorbing structure 500b and the third light-absorbing structure 500c. The first surface of the first partition plate 610 can form at least one of the reflection cavity 511 of the second light-absorbing structure 500b and the reflection cavity 511 of the third light-absorbing structure 500c with the housing 600.

[0264] For example, the number of stray light absorbing structures 500 is set to multiple. The housing 600 may be provided with a second partition 620, which may at least be used to form the receiving member 510.

[0265] The first surface of the second partition plate 620 and the first part of the housing 600 can form a reflective cavity 511; the second surface of the second partition plate 620 and the second part of the housing 600 can form another reflective cavity 511.

[0266] For example, the first surface of the second partition plate 620 and the first part of the housing 600 can form a reflective cavity 511 of the second light-absorbing structure 500b; the second surface of the second partition plate 620 and the second part of the housing 600 form a reflective cavity 511 of the third light-absorbing structure 500c, so that the second partition plate 620 can be reused to form the second light-absorbing structure 500b and the third light-absorbing structure 500c.

[0267] At least one of the first and second surfaces of the second separator 620 may be provided with a reflective groove 512, which is used to increase the incident angle of stray light.

[0268] In summary, the projection optical engine includes a light source component 100 and an imaging component arranged sequentially along the projection optical path. During the use of the projection optical engine, the light source component 100 can emit light to the imaging structure, and at least part of the light can pass through the imaging structure along the projection optical path to form projection light, thereby enabling the projection optical engine to achieve imaging through the projection light.

[0269] During the use of the projection optical engine, some of the light emitted by the light source assembly 100 deviates from the projection optical path and forms stray light. The stray light absorption structure 500 of the projection optical engine is used to absorb stray light from the light source assembly 100 that does not propagate along the projection optical path, thereby reducing the interference of stray light on the projection light propagating along the projection optical path and improving the imaging effect of the projection optical engine.

[0270] This application provides a vehicle that includes a projection optical engine according to any of the above embodiments.

[0271] Since the vehicle includes the projection optical engine of any of the above embodiments, the advantages of the vehicle including the projection optical engine of any of the above embodiments can be specifically referred to in the relevant description above, and will not be repeated here.

[0272] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0273] In the description of this invention, it should be understood that the terms “comprising” and “having” as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0274] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can be a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0275] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A projection optical engine, characterized in that, It includes a light source assembly (100) and an imaging structure arranged sequentially along the projection light path; The light source assembly (100) emits light to the imaging structure, and at least a portion of the light passes through the imaging structure along the projection light path to form projection light; The projection optical engine includes at least one stray light absorption structure (500) for absorbing stray light from the light source assembly (100).

2. The projection optical engine according to claim 1, characterized in that, The light source assembly (100) includes a light source (110), the light-emitting side of which is disposed toward the imaging structure.

3. The projection optical engine according to claim 1, characterized in that, The light source assembly (100) includes a plurality of light sources (110) and a dichroic mirror assembly, wherein the light sources (110) emit light along the projection light path toward the dichroic mirror assembly; The dichroic mirror assembly is used to combine light from multiple light sources (110) to form composite light, and to propagate the composite light along the projection light path toward the imaging structure.

4. The projection optical engine according to claim 3, characterized in that, The plurality of light sources include a first light source (110a) and a second light source (110b).

5. The projection optical engine according to claim 4, characterized in that, The dichroic mirror assembly includes a dichroic mirror (130).

6. The projection optical engine according to claim 5, characterized in that, The first light source (110a) is disposed on the first surface side of the dichroic mirror (130).

7. The projection optical engine according to claim 6, characterized in that, The second light source (110b) is disposed on the second surface side of the dichroic mirror (130).

8. The projection optical engine according to claim 7, characterized in that, The stray light absorption structure (500) is disposed on the second surface side of the dichroic mirror (130).

9. The projection optical engine according to claim 7, characterized in that, The light-incident side of the stray light absorption structure (500) is disposed facing the second surface of the dichroic mirror (130).

10. The projection optical engine according to claim 3, characterized in that, The plurality of light sources include a first light source (110a), a second light source (110b), and a third light source (110c).

11. The projection optical engine according to claim 10, characterized in that, The dichroic mirror assembly includes a first dichroic mirror (130a).

12. The projection optical engine according to claim 11, characterized in that, The first light source (110a) is disposed on the first surface side of the first dichroic mirror (130a).

13. The projection optical engine according to claim 11, characterized in that, The second light source (110b) is disposed on the second surface side of the first dichroic mirror (130a).

14. The projection optical engine according to claim 11, characterized in that, The dichroic mirror assembly includes a second dichroic mirror (130b), the first surface of which is disposed facing the first light source (110a).

15. The projection optical engine according to claim 14, characterized in that, The second surface of the second dichroic mirror (130b) is positioned facing the third light source (110c).

16. The projection optical engine according to claim 14, characterized in that, The first dichroic mirror (130a) and the second dichroic mirror (130b) are arranged at intervals.

17. The projection optical engine according to claim 14, characterized in that, The second surface of the first dichroic mirror (130a) is disposed opposite to the first surface of the second dichroic mirror (130b).

18. The projection optical engine according to claim 16, characterized in that, The second light source (110b) and the third light source (110c) are arranged at intervals.

19. The projection optical engine according to claim 18, characterized in that, The second light source (110b) is disposed between the first dichroic mirror (130a) and the second dichroic mirror (130b).

20. The projection optical engine according to claim 15, characterized in that, The light emission direction of the first light source (110a) is perpendicular to the light emission direction of the second light source (110b).

21. The projection optical engine according to claim 15, characterized in that, The light emission direction of the second light source (110b) is parallel to the light emission direction of the third light source (110c).

22. The projection optical engine according to claim 14, characterized in that, The first light source (110a), the second light source (110b), and the third light source (110c) emit different wavelengths; The first light source (110a) emits light of a first wavelength, the second light source (110b) emits light of a second wavelength, and the third light source (110c) emits light of a third wavelength.

23. The projection optical engine according to claim 22, characterized in that, Along the projection light path, the first wavelength light passes through the first dichroic mirror (130a) and is reflected by the second dichroic mirror (130b) before propagating to the imaging structure.

24. The projection optical engine according to claim 22, characterized in that, Along the projection light path, the second wavelength light is reflected by the first dichroic mirror (130a) and then by the second dichroic mirror (130b) before propagating toward the imaging structure.

25. The projection optical engine according to claim 22, characterized in that, Along the projection light path, the third wavelength light propagates towards the imaging structure after passing through the second dichroic mirror (130b).

26. The projection optical engine according to claim 22, characterized in that, The stray light absorption structure includes a first light-absorbing structure (500a); The light-incident side of the first light-absorbing structure (500a) is disposed facing the first surface of the first dichroic mirror (130a).

27. The projection optical engine according to claim 26, characterized in that, The first light-absorbing structure (500a) absorbs the first wavelength light reflected by the first dichroic mirror (130a).

28. The projection optical engine according to claim 26, characterized in that, The first light-absorbing structure (500a) absorbs the second wavelength light transmitted through the first dichroic mirror (130a).

29. The projection optical engine according to claim 26, characterized in that, The stray light absorption structure includes a second light-absorbing structure (500b); The light-incident side of the second light-absorbing structure is disposed facing the second surface of the second dichroic mirror (130b).

30. The projection optical engine according to claim 29, characterized in that, The second light-absorbing structure (500b) absorbs the first wavelength light and the second wavelength light transmitted through the second dichroic mirror (130b).

31. The projection optical engine according to claim 29, characterized in that, The second light-absorbing structure (500b) absorbs the third wavelength light reflected by the second dichroic mirror (130b).

32. The projection optical engine according to claim 1, characterized in that, The light source is an inorganic light-emitting diode.

33. The projection optical engine according to any one of claims 1-32, characterized in that, The imaging structure includes a first imaging component (200) and a second imaging component (400).

34. The projection optical engine according to claim 33, characterized in that, The first imaging assembly (200) includes a polarizing beam splitter (260), the first surface of which faces the light source assembly (100).

35. The projection optical engine according to claim 34, characterized in that, The second surface of the polarizing beam splitter (260) faces the second imaging assembly (400).

36. The projection optical engine according to claim 34, characterized in that, The polarizing beam splitter (260) is shaped like a sheet.

37. The projection optical engine according to claim 34, characterized in that, The polarizing beam splitter (260) includes a polarizing beam splitter film, which is made of a metal wire grid, an organic material, or an inorganic material.

38. The projection optical engine according to claim 34, characterized in that, Along the projection optical path, the polarizing beam splitter (260) is used to transmit a first portion of the polarized light from the light source assembly (100) and to propagate the first portion of the polarized light toward the second imaging assembly (400).

39. The projection optical engine according to claim 37, characterized in that, The first imaging component (200) further includes a waveplate (270) for reflecting light from the polarizing beam splitter (260).

40. The projection optical engine according to claim 34, characterized in that, The stray light absorption structure includes a third light-absorbing structure (500c), which is used to absorb the second portion of polarized light reflected by the polarizing beam splitter (260).

41. The projection optical engine according to claim 40, characterized in that, The light-incident side of the third light-absorbing structure (500c) faces the first surface of the polarizing beam splitter (260).

42. The projection optical engine according to claim 33, characterized in that, The first imaging component (200) includes a collimation correction element.

43. The projection optical engine according to claim 42, characterized in that, The radius of curvature of the collimation correction element is greater than or equal to 51 mm and less than or equal to 56 mm.

44. The projection optical engine according to claim 42, characterized in that, The thickness of the collimation correction element is greater than or equal to 1 mm and less than or equal to 3 mm.

45. The projection optical engine according to claim 33, characterized in that, The first imaging component (200) includes a first aperture (251) and a second aperture (252).

46. ​​The projection optical engine according to claim 45, characterized in that, The opening size of the first aperture (251) is larger than the opening size of the second aperture (252).

47. The projection optical engine according to claim 40, characterized in that, The second imaging component (400) is located on the first side of the first imaging component (200).

48. The projection optical engine according to claim 47, characterized in that, Along the projection optical path, the second imaging component (400) and the light source component (100) are located at opposite ends of the first imaging component (200).

49. The projection optical engine according to claim 48, characterized in that, When the stray light absorption structure (500) includes a first light absorption structure (500a), the first light absorption structure (500a) is located on the first side of the first imaging component (200).

50. The projection optical engine according to claim 48, characterized in that, When the stray light absorption structure (500) includes a first light absorption structure (500a), the first light absorption structure (500a) is located at one end of the first imaging component (200) near the light source component (100).

51. The projection optical engine according to claim 48, characterized in that, When the stray light absorption structure (500) includes a second light absorption structure (500b), the second light absorption structure (500b) is located on the second side of the first imaging component (200).

52. The projection optical engine according to claim 48, characterized in that, When the stray light absorption structure (500) includes a second light absorption structure (500b), the second light absorption structure (500b) is located at one end of the first imaging component (200) near the light source component (100).

53. The projection optical engine according to claim 48, characterized in that, The third light-absorbing structure (500c) is located on the second side of the first imaging component (200).

54. The projection optical engine according to claim 48, characterized in that, The third light-absorbing structure (500c) is located at the end of the first imaging component (200) away from the light source component (100).

55. The projection optical engine according to any one of claims 1-54, characterized in that, The stray light absorption structure includes a receiving element (510) that forms a reflecting cavity (511).

56. The projection optical engine according to claim 55, characterized in that, The reflective cavity (511) is used to deflect the stray light to increase the incident angle of the stray light in the reflective cavity (511).

57. The projection optical engine according to claim 56, characterized in that, At least a portion of the cavity wall of the reflecting cavity (511) is provided with a reflecting groove (512), which is used to increase the incident angle of the stray light.

58. The projection optical engine according to claim 55, characterized in that, The stray light absorption structure also includes a reflective sheet (513), which is disposed within the reflective cavity (511).

59. The projection optical engine according to claim 56, characterized in that, The stray light absorption structure includes a unidirectional light-transmitting element (530); The one-way light-transmitting element (530) is used to absorb stray light toward the reflecting cavity (511) and block light rays propagating from the reflecting cavity (511) toward the projection light path.

60. The projection optical engine according to claim 59, characterized in that, The one-way light-transmitting element (530) is configured such that the transmittance of light rays at a large incident angle is less than that of light rays at a small incident angle.

61. The projection optical engine according to claim 55, characterized in that, The number of stray light absorption structures is set to multiple, and at least two of the stray light absorption structures have their reflective cavities (511) connected.

62. The projection optical engine according to claim 57, characterized in that, The projection optical engine also includes a housing (600).

63. The projection optical engine according to claim 62, characterized in that, The light source assembly (100) and the imaging structure are disposed in the housing (600).

64. The projection optical engine according to claim 62, characterized in that, The housing (600) is reused to form at least a portion of the stray light absorption structure.

65. The projection optical engine according to claim 64, characterized in that, The housing (600) is provided with a first partition plate (610), which is used to form part of the receiving member (510).

66. The projection optical engine according to claim 65, characterized in that, The first surface of the first partition plate (610) and the housing (600) form the reflective cavity (511).

67. The projection optical engine according to claim 65, characterized in that, The second surface of the first partition plate (610) and the housing (600) form a mounting cavity (630) for accommodating part of the imaging structure.

68. The projection optical engine according to claim 65, characterized in that, The first surface of the first separator (610) is provided with a reflective groove (512), which is used to increase the incident angle of the stray light.

69. The projection optical engine according to claim 64, characterized in that, The housing (600) is provided with a second partition plate (620) for forming part of the receiving member (510).

70. The projection optical engine according to claim 69, characterized in that, The first surface of the second partition plate (620) and the first part of the housing (600) form a reflective cavity (511).

71. The projection optical engine according to claim 70, characterized in that, The first surface of the second partition plate (620) is provided with a reflective groove (512).

72. The projection optical engine according to claim 69, characterized in that, The second surface of the second partition plate (620) and the second portion of the housing (600) form another of the reflective cavities (511).

73. The projection optical engine according to claim 72, characterized in that, The second surface of the second partition plate (620) is provided with a reflective groove (512).

74. A vehicle, characterized in that, Including the projection optical engine as described in any one of claims 1-73.

Images