Light combination assembly, illumination module and optical equipment

Abstract

The utility model discloses a light combination assembly, an illumination module and optical equipment. The light combination assembly comprises a polarization beam splitter and a reversal unit, and the reversal unit is arranged on any light emitting side of the polarization beam splitter, so that energy loss caused by spectrum overlapping or trepanning can be reduced, the energy utilization rate of a light source is improved, and the purposes of improving the light efficiency of the whole machine and the output luminous flux are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of optical devices, and specifically to a light combining component, a lighting module and an optical device. Background Art

[0002] In the field of projection technology, the current dominant projection solutions on the market include pure laser, pure LED and hybrid light source solutions. The pure laser solution means that all lighting sources are laser, while the pure LED solution relies entirely on LED as the lighting source. In addition, the hybrid light solution combines the two light sources of laser and LED to achieve a better projection effect by integrating the advantages of both.

[0003] Regardless of which solution is adopted, the lighting system usually includes at least three light sources of different colors. After these light sources of different colors emit light, they need to be converged through a specific light combination technology, and then illuminated to the spatial light modulation device, which modulates the light and projects it through the projection lens to form a projection image.

[0004] Existing light combining technologies can be mainly divided into two categories: wavelength light combining and position light combining. Wavelength light combining relies on the difference between the wavelengths of different light sources, and combines the light through optical devices such as dichroic mirrors or bandpass filters. Position light combining, on the other hand, utilizes the difference in the spatial position of different light sources, such as using a reflector with a central hole, so that the light from one light source directly passes through the central hole, while the light from another light source is reflected from other areas of the reflector, thereby combining the light.

[0005] However, both of these light-combining technologies have significant efficiency issues. For positional light combining, due to the presence of the center hole, the light that should have been used for projection is completely lost at the center hole, resulting in reduced light energy utilization. As for wavelength light combining, especially when it comes to wide-spectrum light sources or light sources with similar colors, due to their extremely high spectral overlap, the light energy of the spectrally overlapping part often cannot be effectively utilized during the light combining process, further reducing the light combining efficiency. These problems limit the further improvement of the brightness and color performance of projection equipment, and also affect the user experience and market competitiveness of the equipment.

[0006] The content of this background technology description is only for facilitating understanding of the relevant technology in this field and is not regarded as an admission of the prior art. Summary of the invention

[0007] The embodiments of the present application intend to provide a light combining component, a lighting module and an optical device, which use a polarization beam splitter and an inversion unit to form a light combining component for light combining; it can reduce energy loss caused by spectral overlap or opening, thereby improving the energy utilization rate of the light source, and further achieving the purpose of improving the overall light efficiency and output luminous flux. The light combining component is introduced below in conjunction with a specific embodiment.

[0008] In a first aspect, an embodiment of the present application provides a light combining component, comprising: a polarization beam splitter and an inversion unit; the inversion unit is arranged on any light emitting side of the polarization beam splitter.

[0009] Optionally, the polarization beam splitter device is a polarization beam splitter prism or a polarization beam splitter plate.

[0010] Optionally, the inversion unit includes: a 1 / 4 wave plate and a reflector; the 1 / 4 wave plate is arranged between the polarization splitter and the reflector; the 1 / 4 wave plate and the reflector are bonded or fixed together or the 1 / 4 wave plate and the reflector are independent of each other.

[0011] Optionally, the inversion unit is a reflective liquid crystal device, and the reflective liquid crystal device includes a liquid crystal layer and a reflective layer.

[0012] Optionally, the polarization beam splitter comprises: a polarization beam splitting medium film and a transparent flat substrate; the polarization beam splitting medium film is plated on the transparent flat substrate.

[0013] Optionally, the polarization splitter prism includes: two right-angle prisms, the oblique surfaces of the two right-angle prisms are bonded to each other, and the oblique edges of the right-angle prisms are coated with a polarization splitter medium film, and the polarization splitter medium film is configured to transmit the first polarized light and reflect the second polarized light or transmit the second polarized light and reflect the first polarized light.

[0014] In an embodiment of the present application, in a second aspect, an embodiment of the present application provides a lighting module, comprising: two light source assemblies and a light combining assembly as described in any embodiment of the first aspect above; the two light source assemblies are respectively located on the sides of the two light incident surfaces of the polarization splitting of the polarization splitter, the light source assembly includes a light source of at least one color, and the light source is a laser light source or an LED light source.

[0015] Optionally, each light source assembly includes the same light source type or different light source types; the light source type is an integrated light source or a discrete light source.

[0016] Optionally, the two light source assemblies include at least one broad-spectrum light source, or the two light source assemblies include at least one light source with the same or similar color.

[0017] In an embodiment of the present application, in a third aspect, an embodiment of the present application provides an optical device, which includes: a light modulation module, an imaging module, and the lighting module described in any embodiment of the second aspect above; the illumination light emitted by the lighting module is modulated by the light modulation module, and then amplified by the imaging module and projected out to form a projection picture.

[0018] Other optional features and technical effects of the embodiments of the present application are partially described below, and partially can be understood by reading this document. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. The elements shown are not limited by the proportions shown in the accompanying drawings. The same or similar reference numerals in the accompanying drawings represent the same or similar elements, wherein:

[0020] Figure 1 A schematic diagram of the structure of a light combining component that can implement an embodiment of the present application is shown;

[0021] Figure 2 A schematic diagram of the structure of a polarization beam splitter prism that can implement the embodiment of the present application is shown;

[0022] Figure 3 Another schematic diagram of the structure of a light combining component that can implement the embodiment of the present application is shown;

[0023] Figure 4 A schematic diagram of a polarization beam splitter that can implement the embodiment of the present application is shown;

[0024] Figure 5 A schematic diagram of the structure of a light combining component including a polarization beam splitter that can implement an embodiment of the present application is shown;

[0025] Figure 6 A schematic diagram of the structure of a lighting module that can implement the embodiment of the present application is shown;

[0026] Figure 7 Another schematic diagram of the structure of a lighting module that can implement the embodiment of the present application is shown;

[0027] Figure 8 A schematic diagram of the structure of an optical device that can implement an embodiment of the present application is shown.

[0028] The markings in the figure are as follows: 10-light combining component; 20-first light source component; 30-second light source component; 101-polarization splitter; 102-inversion unit; 40-polarization splitter; 401-polarization splitter medium film; 402-transparent flat substrate; 801-illumination module; 802-light modulation module; 803-imaging module. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with specific implementation methods and drawings. Here, the illustrative implementation methods and descriptions of the present application are used to explain the present application, but are not intended to limit the present application.

[0030] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0031] In the embodiments of the present application, a polarization beam splitter and an inversion unit are provided to form a light combining component, which can reduce energy loss caused by spectral overlap or opening, thereby improving the energy utilization of the light source, and further achieving the purpose of improving the overall light efficiency and output luminous flux. The light combining component is introduced below in conjunction with a specific embodiment.

[0032] Figure 1 A schematic diagram of the structure of a light combining component that can implement the embodiment of the present application is shown. Figure 1 The light combining component 10 shown includes: a polarization beam splitter 101 and an inversion unit 102. The polarization beam splitter can selectively allow light of a first polarization state to be transmitted, while reflecting light of a second polarization state. In the application embodiment, the polarization beam splitter can be a polarization beam splitter (PBS) or other types of polarization beam splitters. The embodiment of the application does not impose any specific restrictions on the polarization beam splitter. Figure 1 PBS is used for illustrative purposes only.

[0033] In order to achieve polarization state conversion of light, the inversion unit 102 is placed on any light-emitting side of the polarization beam splitter 101, and the inversion unit 102 is used to change the polarization state of the light incident thereon. For example, the inversion unit 102 can convert the original first polarization state light into the second polarization state, and return the converted light to the polarization beam splitter along the original path. The light returned to the polarization beam splitter is then reflected out by the polarization beam splitter.

[0034] It should be noted that the first polarization state is a P polarization state or an S polarization state, and the second polarization state is an S polarization state or a P polarization state, that is, if the first polarization state is a P polarization state, the second polarization state is an S polarization state, and if the first polarization state is an S polarization state, the second polarization state is a P polarization state. The first polarization state and the second polarization state are not specifically limited in the embodiments of the present application.

[0035] In some embodiments, the inversion unit 102 includes a 1 / 4 wave plate and a reflector. The 1 / 4 wave plate is disposed between the polarization beam splitter and the reflector, and the 1 / 4 wave plate can be bonded or fixed to the reflector, or can be independent of the reflector. Due to the presence of the reflector, light passes through the 1 / 4 wave plate twice when passing through the inversion unit, which is equivalent to passing through a 1 / 2 wave plate, thereby achieving polarization state conversion.

[0036] In some other embodiments, the inversion unit 102 is a reflective liquid crystal device. The reflective liquid crystal device includes a liquid crystal layer and a reflective layer, and can achieve the same function as the combination of a quarter wave plate and a reflector without additional optical elements. Thereby achieving the effect of changing the polarization state of light and reflecting light. Optionally, the reflective liquid crystal device is a liquid crystal on silicon (LCOS) chip. Since the LCOS chip itself includes a liquid crystal box and a reflective layer, its function is the same as that of the combination of a quarter wave plate and a reflector, and can also achieve the effect of changing the polarization state of light and reflecting light.

[0037] The following is a schematic description using a polarization beam splitter as a PBS. Figure 1 As shown, the inversion unit 102 is arranged on the light-emitting side of the PBS in the second direction (y-axis direction) (i.e. Figure 2 Of course, the inversion unit 102 can also be set on the light emitting side of the PBS in the first direction (x-axis direction). The embodiment of the present application does not specifically limit the position of the inversion unit in the PBS.

[0038] The following is a detailed description of the polarization beam splitter prism structure, see Figure 2 . Figure 2 FIG. 2 shows a schematic diagram of a polarization beam splitting prism structure that can be used to implement the embodiment of the present application. Figure 2 As shown, PBS is made of two high-precision right-angle prisms glued together, the oblique surfaces of the two right-angle prisms are attached to each other, and the oblique edges of the right-angle prisms are coated with a polarization splitting medium film, which is configured to transmit P polarized light (first polarized light) and reflect S polarized light (second polarized light) (it can also transmit S polarized light and reflect P polarized light). The surface coated with the polarization splitting medium film is called the polarization splitting plane, and the angle between the incident light and the polarization splitting plane is 45°. The other surfaces of the prism and all surfaces of the other prism are coated with anti-reflection films.

[0039] In some embodiments, the polarization splitting prism can be composed of a right-angle prism, wherein the hypotenuse of the right-angle prism is coated with a polarization splitting dielectric film, and the polarization splitting dielectric film is configured to transmit P polarized light (first polarized light) and reflect S polarized light (second polarized light) (it can also transmit S polarized light and reflect P polarized light), and the surface coated with the polarization splitting dielectric film is called a polarization splitting plane, and the angle between the incident light and the polarization splitting plane is 45°, and the other surfaces of the prism are coated with anti-reflection films.

[0040] like Figure 2 As shown, PBS has two light incident surfaces and two light emitting surfaces, where the light emitting surface located in the first direction (x-axis direction) is called the first light emitting surface, and the light emitting surface located in the second direction (y-axis direction) is called the second light emitting surface, and the first direction is perpendicular to the second direction.

[0041] The first light incident surface is arranged opposite to the first light emitting surface, and the second light incident surface is arranged opposite to the second light emitting surface. The incident light enters the PBS from the two light incident surfaces, and after being acted upon by the light combining component, it is emitted from a light emitting surface of the PBS. It should be noted that the light incident surface and the light emitting surface are determined relative to the incident and emitting directions of the light, and are related to the position of the light source, that is, corresponding to different light source positions, the light incident surface and the light emitting surface correspond to different surfaces of the PBS.

[0042] The following is an introduction to the light combining principle of the light combining component. Figure 1 As shown, the light combining principle of the light combining component is that the P polarized light emitted by the first light source component is transmitted through the polarization beam splitter 101 (in Figure 1 In the illustrated embodiment, PBS is taken as an example for schematic explanation) and is directly emitted from the first light emitting surface after transmission. The P polarized light emitted by the second light source assembly enters the inversion unit after transmission through the PBS, and is converted into S polarized light and reflected by the inversion unit. When the S polarized light reflected from the inversion unit is further propagated to the PBS, it is reflected by the polarization splitting surface of the PBS and is also emitted from the first light emitting surface, thereby realizing the light combination of the light emitted by the first light source assembly and the second light source assembly.

[0043] Figure 1 The embodiment shown shows that the combined light beams are emitted in a first direction, and the combined light beams are emitted in a second direction as described below. Figure 3 , Figure 3 Another schematic diagram of the structure of a light combining component that can implement the embodiment of the present application is shown. Figure 3 As shown, the combined light is emitted along the second direction, and the inversion unit 102 is arranged on the light emitting side of the polarization beam splitter 101 (PBS is used as an example for schematic illustration) in the first direction, that is, Figure 2 One side of the first light emitting surface shown. Figure 3The P polarized light emitted by the second light source assembly is directly emitted from the second light emitting surface after being transmitted through the PBS, and the P polarized light emitted by the first light source assembly enters the inversion unit 102 after being transmitted through the PBS, and is converted into S polarized light and reflected by the inversion unit 102. When the S polarized light reflected from the inversion unit 102 is further propagated to the PBS, it is reflected by the polarization splitting surface of the PBS and also emitted from the second light emitting surface, thereby realizing the light combination of the light emitted by the first light source assembly and the light emitted by the second light source assembly.

[0044] It should also be noted that the light combining process in the above embodiments is based on Figure 2 The PBS shown is taken as an example. When the position of the polarization splitting plane changes (such as from 45° to the left to 45° to the right), or the light incident surface and light output surface change, or the effect of the polarization splitting plane on the polarization state changes (such as from transmitting P and reflecting S to transmitting S and reflecting P), the light combining principle is similar and will not be repeated here.

[0045] The above embodiment takes PBS as an example to illustrate the light combining process of the light combining assembly. When the PBS is replaced with a polarization beam splitter, the principle of the above embodiment is also applicable. Figure 4 , Figure 4 FIG. 2 shows a schematic diagram of a polarization beam splitter that can be used to implement the embodiment of the present application. Figure 4 As shown, the polarization beam splitter 40 includes a polarization beam splitting dielectric film 401 and a transparent flat substrate 402, and the polarization beam splitting dielectric film 401 is plated on the transparent flat substrate 402. Among them, the material of the transparent flat substrate 402 can be a light-transmitting solid material such as glass, rubber, plastic or ceramic, and the polarization beam splitting dielectric film 401 is configured to transmit P polarized light and reflect S polarized light (it can also transmit S polarized light and reflect P polarized light). When applied to a light-combining component, the polarization beam splitting plane is at an angle of 45° with the incident light. It should be noted that compared with PBS, for the polarization beam splitter, the light incident surface and the light exit surface are virtual surfaces, and the relative positions of the light incident surface and the light exit surface are consistent with those of PBS.

[0046] The following is an introduction to the light combining principle of the light combining assembly including the polarization beam splitter. Figure 5 . Figure 5 FIG. 1 shows a schematic diagram of a light combining component including a polarization beam splitter that can implement an embodiment of the present application. Figure 5As shown, the light combining principle of the light combining component is that the P polarized light emitted by the first light source component is transmitted through the polarization beam splitter 40 and then directly emitted from the first light emitting surface, and the P polarized light emitted by the second light source component is transmitted through the polarization beam splitter 40 and then enters the inversion unit 102, and is converted into S polarized light and reflected by the inversion unit 102. When the S polarized light reflected from the inversion unit 102 is further propagated to the polarization beam splitter 40, it is reflected by the polarization beam splitting medium film 401 of the polarization beam splitter 40 and also emitted from the first light emitting surface, thereby realizing the light combining of the light emitted by the first light source component and the second light source component.

[0047] It should be noted that, in the light combining component including the polarization beam splitter, the light combining principle of the light combining component in which the combined light is emitted along the second direction is similar to that in the above embodiment, and will not be described in detail here.

[0048] The embodiment of the present application also discloses a lighting module, which includes a first light source assembly, a second light source assembly, and a light combining assembly described in any of the above embodiments. The first light source assembly and the second light source assembly are both located on the light incident side of the polarization splitting surface, and the first light source assembly and the second light source assembly include light sources of at least one color. The light source color in the embodiment of the present application is a color perceived by the human eye, such as red, green, blue, yellow, cyan, purple, etc.

[0049] Specifically, depending on the type of light source assembly, the light source assembly may also include other optical components such as lenses and light homogenizers. The light source type here mainly refers to the light-emitting principle and packaging method of the light source. For example, according to the light-emitting principle, it can be divided into laser light sources and LED light sources; according to the packaging method, it can be divided into integrated light sources and discrete light sources.

[0050] In the embodiments of the present application, the first light source assembly and the second light source assembly are separately arranged on the sides where the two light incident surfaces are located. Exemplarily, the first light source assembly is located on the first light incident surface side of the polarization beam splitter (the side away from the first light emitting surface), and the first light incident surface is arranged opposite to the first light emitting surface, and the second light source assembly is located on the second light incident surface side of the polarization beam splitter (the side away from the second light emitting surface), and the second light incident surface is arranged opposite to the second light emitting surface.

[0051] It should be noted that the same light source assembly may include light sources of the same type or different light sources, and different light source assemblies may include light sources of the same type or different light sources.

[0052] Preferably, the first light source assembly and the second light source assembly each include a light source of at least one color. For example, if the first light source assembly includes a light source of one color, the light source colors included in the second light source assembly may be one, two, or three, etc. When the first light source assembly includes light sources of two colors, the light source colors included in the second light source assembly may also be one, two, or three, etc. The embodiment of the present application does not specifically limit the number of light source colors included in the light source assembly.

[0053] The following is a detailed description of the light source components in the lighting module. Figure 6 and Figure 7 . Figure 6 A schematic diagram of the structure of a lighting module that can implement the embodiment of the present application is shown.

[0054] Figure 6 The lighting module shown includes: a light combining assembly 10, a first light source assembly 20 and a second light source assembly 30. The light combining assembly 10 is the same as the above embodiment and will not be described in detail here.

[0055] For example, Figure 6 In the illustrated embodiment, the first light source assembly 20 and the second light source assembly 30 include at least one wide spectrum light source or a light source of the same color (same color light source). When two same color light sources with different wavelengths are included, the two same color light sources with different wavelengths are respectively located in the first light source assembly and the second light source assembly. For example, if a 613nm red light source is located in the first light source assembly, a 630nm red light source is located in the second light source assembly. It is generally believed that LED light sources are wide spectrum light sources, especially LED light sources in the yellow to green wavelength band.

[0056] like Figure 6 As shown, the first light source assembly 20 is an LED light source assembly, and the first light source assembly 20 includes an LED light source of at least one color, and the second light source assembly 30 is a laser light source assembly, and the second light source assembly 30 includes a laser light source of at least one color. Figure 6 As shown, the first light source assembly 20 includes a red LED light source (R-LED), a green LED light source (G-LED) and a blue LED light source (B-LED). The second light source assembly 30 includes a red laser light source (R-LD), a green laser light source (G-LD) and a blue laser light source (B-LD). Figure 6 In the embodiment shown, the three-color laser light source is an integrated light source. Since the divergence angle of the LED light source is large, in order to improve the energy utilization rate of the LED light source, a lens group can also be provided in the first light source assembly 20 to collimate and reduce the light emitted by the LED light source. In addition, since the LED light source is a non-polarized light source, optionally, as Figure 6As shown, in order to improve the utilization rate of light energy, a polarization conversion device can also be set in the first light source assembly 20 to convert all the light emitted by the LED light source into a target polarization state. The target polarization state is the transmission polarization state of the polarization splitter. If the polarization splitter transmits P polarized light and reflects S polarized light, the target polarization state is the P polarization state.

[0057] Since the laser is Gaussian light, a scattering sheet may be provided in the second light source assembly 30 to de-Gaussianize the laser. In addition, if the polarization state of the laser light source is not the target polarization state, a polarization conversion device may be provided on its light output side to convert the laser light emitted by the laser light source into the target polarization state. In addition, since the spot of the laser light source is small, the second light source assembly may also include a beam expander for the purpose of matching the spot size of the LED light source.

[0058] Figure 7 A schematic diagram of the structure of another lighting module that can implement the embodiment of the present application is shown. Figure 7 The lighting module shown includes: a light combining assembly 10, a first light source assembly 20 and a second light source assembly 30. The light combining assembly 10 is the same as the above embodiment and will not be described in detail here.

[0059] like Figure 7 As shown, the first light source assembly 20 is an LED light source assembly, and the first light source assembly only includes a green LED light source (G-LED). The second light source assembly 30 includes three color laser light sources, namely a red laser light source (R-LD), a green laser light source (G-LD) and a blue laser light source (B-LD). Figure 7 In the illustrated embodiment, the three-color laser light source is a discrete light source. When the first light source assembly 20 or the second light source assembly 30 includes a plurality of light sources of different colors and the plurality of light sources of different colors are discrete light sources, the light source assembly may further include a dichroic mirror to combine the light of different colors in each light source assembly and then combine it with the emitted light of another light source assembly.

[0060] Among them, the polarization conversion device is usually composed of a PBS and a 1 / 2 wave plate, which is used to convert all incident light into polarized light of the target polarization state. If the target polarization state is the P polarization state, the polarization conversion device can convert the natural light, S-polarized light, circularly polarized light and other forms of light incident thereon into P polarized light.

[0061] To sum up, through the light combining method provided by the above embodiments, the wide-spectrum light source or the same-color light source in the light combining light source can be set in different light source components, and the light can be combined through the light combining components to avoid reducing the energy loss caused by spectral overlap or opening, thereby improving the energy utilization of the light source, and further achieving the purpose of improving the luminous efficiency and output luminous flux of the whole machine.

[0062] It should be noted that, as required, a collimating component, a light homogenizing component or a relay component may be further provided on the light emitting side of the combined light beam in the lighting module to further process the combined light beam.

[0063] The present application also provides an optical device, see Figure 8 . Figure 8 A schematic diagram of the structure of an optical device that can implement an embodiment of the present application is shown. Figure 8 The optical device shown is a projection device, and the optical device includes: the illumination module 801, the light modulation module 802 and the imaging module 803 described in any of the above embodiments. The illumination light emitted by the illumination module 801 is modulated by the light modulation module 802 (digital micromirror element or silicon-based liquid crystal or liquid crystal display), and then amplified by the imaging module 803 and projected to form a projection picture.

[0064] The projection device in the embodiment of the present application may be a projector or a laser TV, or may be a PGU (Picture Generation Unit) in a HUD (Heads Up Display), etc. The embodiment of the present application is not specifically limited.

[0065] In this article, multiple embodiments of the present application are described, but for the sake of simplicity, the description of each embodiment is not exhaustive, and the same or similar features or parts between the various embodiments may be omitted. In this article, "one embodiment", "some embodiments", "example", "specific example", or "some examples" are intended to be applicable to at least one embodiment or example according to the present application, rather than all embodiments. The above terms do not necessarily mean to refer to the same embodiment or example. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0066] The exemplary systems and methods of the present application have been specifically shown and described with reference to the above embodiments, which are merely examples of the best modes for implementing the present systems and methods. It will be appreciated by those skilled in the art that various changes may be made to the embodiments of the systems and methods described herein when implementing the present systems and / or methods without departing from the spirit and scope of the present application as defined in the appended claims.

Claims

1. A light combining component, characterized in that: include: Polarization splitter and inversion unit; The inversion unit is arranged on any light-emitting side of the polarization beam splitter; The inversion unit is a reflective liquid crystal device, and the reflective liquid crystal device includes a liquid crystal layer and a reflective layer; Or the inversion unit includes: a quarter wave plate and a reflecting mirror; The 1 / 4 wave plate is arranged between the polarization beam splitter and the reflector; The 1 / 4 wave plate and the reflector are adhered or fixed together, or the 1 / 4 wave plate and the reflector are independent of each other.

2. The light combining assembly according to claim 1, characterized in that: The polarization beam splitter device is a polarization beam splitter prism or a polarization beam splitter plate.

3. The light combining assembly according to claim 2, characterized in that: The polarization beam splitter comprises: a polarization beam splitting medium film and a transparent flat substrate; The polarization splitting medium film is plated on the transparent flat substrate, and the polarization splitting medium film is configured to transmit the first polarized light and reflect the second polarized light or transmit the second polarized light and reflect the first polarized light.

4. The light combining assembly according to claim 2, characterized in that: The polarization splitter prism includes: a polarization splitter medium film and a right-angle prism. The polarization splitter medium film is plated on the inclined surface of the right-angle prism. The polarization splitter medium film is configured to transmit the first polarized light and reflect the second polarized light or transmit the second polarized light and reflect the first polarized light.

5. A lighting module, characterized in that: The lighting module comprises: two light source assemblies and a light combining assembly as claimed in any one of claims 1 to 4; The two light source components are respectively located on the sides of the two light incident surfaces of the polarization beam splitter, and each light source component includes a light source of at least one color, and the light source is a laser light source or an LED light source.

6. The lighting module according to claim 5, characterized in that: Each light source assembly includes the same light source type or different light source types; the light source type is an integrated light source or a discrete light source.

7. The lighting module according to claim 6, characterized in that: The two light source assemblies include at least one broad-spectrum light source, or the two light source assemblies include at least one light source with the same or similar color.

8. An optical device, characterized in that: The optical device comprises: a light modulation module, an imaging module and an illumination module as claimed in any one of claims 5 to 7; The illumination light emitted by the illumination module is modulated by the light modulation module, amplified by the imaging module and then projected to form a projection picture.

Images