Dodging module and projection device

Abstract

The invention provides a dodging module comprising a dodging element and a shading element. The dodging element comprises a light incident surface and an axis perpendicular to the light incident surface. The shading element is arranged on one side of the light incident surface. The shading element comprises a first reflecting part, at least one second reflecting part and a light inlet. The first reflection part surrounds the light inlet. The at least one second reflection part is provided with a first end part and a second end part which are opposite. The first end portion of the at least one second reflection portion is connected to the first reflection portion, and the second end portion of the at least one second reflection portion is farther from the dodging element than the first reflection portion. The light inlet exposes the light inlet surface. The extension direction of the first reflection part is parallel to the light incident surface, and in the direction parallel to the light incident surface, the distance between the second end part of the at least one second reflection part and the axis is smaller than or equal to the distance between the first end part of the at least one second reflection part and the axis. According to the dodging module and the projection device, the energy absorption degree of the optical element in the illumination system can be reduced, the temperature of the optical element is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to an optical module and an electronic device, and in particular to a light homogenization module and a projection device. Background Art

[0002] Projection devices are display devices used to produce large-size images. With the evolution and innovation of technology, they have been continuously improving. The imaging principle of projection devices is to convert the illumination beam generated by the illumination system into an image beam through a light valve, and then project the image beam onto the projection target (such as a screen or a wall) through a projection lens to form a projection image. In addition, with the market's requirements for the brightness, color saturation, service life, non-toxicity and environmental protection of projection devices, the illumination system has evolved from ultra-high-performance lamps (UHP lamps) and light-emitting diodes (LEDs) to the most advanced laser diode (LD) light sources. There are even packaged light sources formed by all-in-one laser diodes that can provide monochromatic or multi-color beams, which are used to make the internal configuration of the projection device more compact and have better optical performance.

[0003] In the current light combining system, as the brightness demand increases, higher energy light sources will be used. However, this will cause the optical components in the light path to absorb more heat as the energy increases, causing the temperature of the optical components to increase with the system brightness, and after a certain period of use, they will break. Therefore, in order to solve the above situation, an integrating column cover can be set before and after the light integrating column to block part of the light to reduce the formation of stray light. In addition, the current integrating column covers are mostly sheet metal parts, and their surfaces have some reflective properties, so they will also reflect part of the light back into the light path of the system. Although it can reduce the formation of stray light, it will cause the optical components in the original light path to absorb more energy, causing the temperature to rise and be damaged.

[0004] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some prior art that is not known to those skilled in the art. The content disclosed in the "background technology" section does not mean that the content or the problem to be solved by one or more embodiments of the present invention has been known or recognized by those skilled in the art before the application of the present invention. Summary of the invention

[0005] The present invention provides a light homogenization module and a projection device, which can reduce the energy absorption degree of an optical element in an illumination system, lower the temperature of the optical element and increase the service life.

[0006] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0007] To achieve one or part or all of the above purposes or other purposes, the present invention provides a light homogenization module, which includes a light homogenization element and a light shielding element. The light homogenization element includes a light incident surface and an axis perpendicular to the light incident surface. The light shielding element is arranged on one side of the light incident surface. The light shielding element includes a first reflecting portion, at least one second reflecting portion and a light entrance. The first reflecting portion surrounds the light entrance. At least one second reflecting portion has opposite first and second ends. The first end of at least one second reflecting portion is connected to the first reflecting portion, and the second end of at least one second reflecting portion is farther away from the light homogenization element than the first reflecting portion. The light entrance exposes the light incident surface. The extension direction of the first reflecting portion is parallel to the light incident surface, and in the direction parallel to the light incident surface, the distance between the second end of at least one second reflecting portion and the axis is less than or equal to the distance between the first end of at least one second reflecting portion and the axis.

[0008] To achieve one or part or all of the above purposes or other purposes, the present invention also provides a projection device, which includes an illumination system, at least one light valve and a projection lens. The illumination system is used to provide an illumination beam. At least one light valve is arranged on the transmission path of the illumination beam from the illumination system to convert the illumination beam into an image beam. The projection lens is arranged on the transmission path of the image beam to project the image beam out of the projection device. The illumination system includes a light source module and a uniform light module. The light source module is used to provide an illumination beam. The uniform light module is arranged on the transmission path of the illumination beam to receive and uniformize the illumination beam. The uniform light module includes a uniform light element and a shading element. The uniform light element includes a light incident surface and an axis perpendicular to the light incident surface. The shading element is arranged on one side of the light incident surface. The shading element includes a first reflecting portion, at least one second reflecting portion and a light entrance. The first reflecting portion surrounds the light entrance. At least one second reflecting portion has opposite first and second ends. The first end of at least one second reflecting portion is connected to the first reflecting portion, and the second end of at least one second reflecting portion is further away from the light homogenizing element than the first reflecting portion. The light entrance exposes the light incident surface. The extension direction of the first reflecting portion is parallel to the light incident surface, and in the direction parallel to the light incident surface, the distance between the second end of at least one second reflecting portion and the axis is less than or equal to the distance between the first end of at least one second reflecting portion and the axis.

[0009] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the light homogenization module and the projection device of the present invention, the light homogenization module includes a light homogenization element and a shading element arranged on one side of the light incident surface of the light homogenization element. Among them, the shading element includes a first reflecting portion, at least one second reflecting portion and a light entrance. The second reflecting portion has an opposite first end and a second end, the first end is connected to the first reflecting portion, and the second end is farther away from the light homogenization element than the first reflecting portion. The light homogenization element includes an axis perpendicular to the light incident surface, and in a direction parallel to the light incident surface, the distance between the second end and the axis is less than or equal to the distance between the first end and the axis. In this way, the reflection direction of light can be changed by designing the shading element to reduce stray light in the light path returning to the lighting system, thereby reducing the energy absorption degree of the optical elements in the lighting system, reducing the temperature of the optical elements and increasing the service life.

[0010] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. 4 is a schematic diagram of a projection device according to an embodiment of the present invention.

[0012] Figure 2 and Figure 3 They are schematic diagrams of a light homogenization module under different viewing angles according to an embodiment of the present invention.

[0013] Figure 4A FIG. 4 is a cross-sectional schematic diagram of a light homogenization module according to an embodiment of the present invention.

[0014] Figure 4B FIG. 4 is a cross-sectional schematic diagram of a light homogenization module according to another embodiment of the present invention.

[0015] Figure 5 FIG. 4 is a cross-sectional schematic diagram of a light homogenization module according to another embodiment of the present invention.

[0016] Figure 6 FIG. 4 is a cross-sectional schematic diagram of a light homogenization module according to another embodiment of the present invention.

[0017] Figure 7 FIG. 4 is a cross-sectional schematic diagram of a light homogenization module according to another embodiment of the present invention.

[0018] Reference numerals list

[0019] 10: Projection device

[0020] 50: Lighting system

[0021] 60: Light valve

[0022] 70: Projection lens

[0023] 100, 100A~100C: Light homogenization module

[0024] 110: Light homogenization element

[0025] 112: Surrounding wall

[0026] 120, 120A~120C: Shading element

[0027] 122: first reflection part

[0028] 124, 124A: second reflecting portion

[0029] 126: Extension

[0030] 128: Functional film layer

[0031] 130: Base

[0032] 132: Positioning column

[0033] 140: Protective shell

[0034] A: Light incident surface

[0035] B: Axis

[0036] C: Cavity

[0037] D:Light entrance

[0038] d1, d2: distance

[0039] E1: First end

[0040] E2: Second end

[0041] F: Virtual plane

[0042] G: Cooling fins

[0043] LB: Lighting beam

[0044] LI: Image beam

[0045] θ: angle. DETAILED DESCRIPTION

[0046] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms (e.g., up, down, left, right, front or back, etc.) mentioned in the following embodiments are only the directions with reference to the attached drawings. Therefore, the directional terms used are used for explanation and are not used to limit the present invention.

[0047] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 1 The present embodiment provides a projection device 10, which includes an illumination system 50, at least one light valve 60, and a projection lens 70. The illumination system 50 is used to provide an illumination beam LB. The at least one light valve 60 is disposed on the transmission path of the illumination beam LB from the illumination system 50, and is used to convert the illumination beam LB into an image beam LI. The projection lens 70 is disposed on the transmission path of the image beam LI, and is used to project the image beam LI out of the projection device 10 to a projection target (not shown), such as a screen or a wall.

[0048] The lighting system 50 is composed of a plurality of components such as a light emitting element, a light splitting element, a light combining element, a lens, a wavelength conversion element, a filter element, and a light homogenizing element. The light emitted by the light emitting element is used to provide light with different wavelengths and form an illumination beam LB after passing through the light filtering element. The illumination beam LB is homogenized by the light homogenizing element and leaves the lighting system 50. In other embodiments, the lighting system 50 may not be configured with a light filtering element, and other optical elements may be used to generate light with different wavelengths to form an illumination beam LB. The illumination beam LB is homogenized by the light homogenizing element and leaves the lighting system 50. For example, in the present embodiment, the lighting system 50 includes a light source module (not shown) and a light homogenizing module 100. The light source module is used to provide the illumination beam LB, and the light homogenizing module 100 is configured on the transmission path of the illumination beam LB to receive and homogenize the illumination beam LB. The light source module may include a plurality of light emitting elements, such as a plurality of light emitting diodes (LEDs) or a plurality of laser diodes (LDs). The illumination beam LB may include a combination of multiple beams of different wavelengths or a beam of at least one wavelength, wherein the multiple beams of different wavelengths may be output from the illumination system 50 as the illumination beam LB at different time sequences. However, the present invention is not limited thereto. The detailed implementation of the light homogenization module 100 will be described later, and the present invention does not limit the type or form of the illumination system 50 in the projection device 10. Therefore, the remaining detailed structures and implementations of the illumination system 50 can obtain sufficient teachings, suggestions and implementation instructions from the common knowledge in the relevant field, and therefore will not be repeated.

[0049] The light valve 60 is, for example, a reflective light modulator such as a Liquid Crystal On Silicon panel (LCoS panel) or a Digital Micro-mirror Device (DMD). In some embodiments, the light valve 60 may also be a transmissive light modulator such as a Transparent Liquid Crystal Panel, an Electro-Optical Modulator, a Magneto-Optic modulator, or an Acousto-Optic Modulator (AOM). The present invention does not limit the form and type of the light valve 60. The detailed steps and implementation methods of the method by which the light valve 60 converts the illumination light beam LB into the image light beam LI can be sufficiently taught, suggested, and implemented from the common knowledge in the field, and therefore will not be described in detail. In this embodiment, the number of the light valves 60 may be one to three, and the present invention is not limited thereto.

[0050] The projection lens 70 includes, for example, a combination of one or more optical lenses with diopter, such as various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 70 may also include a planar optical lens that projects the image beam LI from the light valve 60 to the projection target in a reflective manner. The present invention does not limit the type and type of the projection lens 70.

[0051] Figure 2 and Figure 3 They are schematic diagrams of a light homogenization module under different viewing angles according to an embodiment of the present invention. Figure 4A FIG. 4 is a cross-sectional schematic diagram of a light homogenization module according to an embodiment of the present invention. Figure 4A The light homogenization module 100 shown can be applied to at least Figures 1 to 3 In the uniform light module 100, the following is used as an example for explanation. For the convenience of reading, Figure 3 The protective shell 140 is omitted. Figure 4A Only the light homogenizing element 110 and the light shielding element 120 are shown. Figures 1 to 4A. In the present embodiment, the light homogenizing module 100 includes a light homogenizing element 110 and a shading element 120. The light homogenizing element 110 includes a light incident surface A and an axis B perpendicular to the light incident surface A. In detail, the axis B is a virtual line passing through the geometric center of the light incident surface A and perpendicular to the light incident surface A. The light homogenizing element 110 may be a hollow integration rod or a solid integration rod. The light homogenizing element 110 of the present embodiment is illustrated by taking a hollow integration rod as an example. The light homogenizing element 110 includes a surrounding wall 112 and a cavity C. The cavity C is formed inside the surrounding wall 112, and the light incident surface A is located at one end of the cavity C. Specifically, in the present embodiment, the light homogenizing module 100 also includes a base 130 and a protective shell 140. Among them, the light homogenizing element 110 is configured on the base 130, and the protective shell 140 is connected to the base 130, and the protective shell 140 and the base 130 connected to each other are used to cover the light homogenizing element 110.

[0052] The shading element 120 is disposed on one side of the light incident surface A of the light homogenizing element 110 to block unwanted light beams from entering the light homogenizing element 110 to improve the optical quality, wherein the illumination light beam LB is incident into the light homogenizing element 110 from the light incident surface A of the light homogenizing element 110, and the unwanted light beam is, for example, the reflected light or stray light generated by the illumination light beam LB due to irradiation to the material section or other elements of the light homogenizing element 110. The shading element 120 includes a first reflecting portion 122, at least one second reflecting portion 124, and a light entrance D, wherein the light entrance D exposes part or all of the light incident surface A of the light homogenizing element 110. The extension direction of the first reflecting portion 122 is parallel to the light incident surface A of the light homogenizing element 110, and surrounds the light entrance D. Specifically, in the present embodiment, the shading element 120 further includes an extension portion 126, which extends from the first reflecting portion 122 toward the light homogenizing element 110 in a direction parallel to the axis B of the light homogenizing element 110. The extension portion 126 may have a connection structure (not shown) for connecting the base 130 so that the shading element 120 is fixed to the base 130, wherein the connection structure may be a snap-fit ​​structure, but the present invention is not limited thereto. In this embodiment, the base 130 may be further designed to include a plurality of positioning posts 132, which are inserted through the first reflecting portion 122 of the shading element 120 for positioning, but the present invention is not limited thereto. To further illustrate, the extension portion 126, for example, surrounds a portion of the light homogenizing element 110.

[0053] Please refer to Figure 4BIn the present embodiment, the first reflective portion 122 is provided with a functional film layer 128 on at least a portion of the surface away from the light homogenizing element 110, wherein the functional film layer 128 is, for example, a light absorbing layer or a diffuse reflection layer. The light absorbing layer is, for example, a black coating, an anodized layer, or an anti-reflection coating. In detail, the light absorbing layer can be formed by coating a black pigment on the surface, anodizing the surface, or coating the surface with an anti-reflection coating. The diffuse reflection layer is a coating having diffuse reflection particles added thereto, or a structural layer having a rough surface formed by atomized sandblasting, but the present invention is not limited thereto.

[0054] Please also refer to Figure 4A and Figure 4B . At least one second reflecting portion 124 has an opposite first end E1 and a second end E2. The first end E1 of the at least one second reflecting portion 124 is connected to the first reflecting portion 122, and the second end E2 of the at least one second reflecting portion 124 is farther away from the light homogenizing element 110 than the first reflecting portion 122. In a direction parallel to the light incident surface A of the light homogenizing element 110, a distance d2 between the second end E2 of the at least one second reflecting portion 124 and the axis B is less than or equal to a distance d1 between the first end E1 of the at least one second reflecting portion 124 and the axis B. In detail, in the present embodiment, the second reflecting portion 124 is a gradually expanding opening from the second end E2 to the first end E1, and a surface of the second reflecting portion 124 along the second end E2 to the first end E1 forms an angle θ with a surface of the first end 122 away from the light homogenizing element 110 at the first end E1, wherein the angle θ may be between 90 degrees and 165 degrees.

[0055] In addition, on the virtual plane F parallel to the light incident surface A, the orthographic projection of at least one second reflecting portion 124 in the virtual plane F at least partially overlaps with the orthographic projection of the surrounding wall 112 in the virtual plane F. Alternatively, on the virtual plane F parallel to the light incident surface A, the orthographic projection of the second reflecting portion 124 in the virtual plane F does not overlap with the orthographic projection of the cavity C in the virtual plane F. It is worth mentioning that in the embodiment of the solid light homogenizing element 110, the orthographic projection of at least one second reflecting portion 124 in the virtual plane F also at least partially overlaps with the orthographic projection of the light homogenizing element 110 in the virtual plane F, and the overlapping area is less than or equal to 20% of the orthographic projection area of ​​the light homogenizing element 110 in the virtual plane F. In this embodiment, similar to the functional film layer 128 configured on the first reflecting portion 122 (see Figure 4B), at least a portion of the surface of at least one second reflective portion 124 may also have a functional film layer, such as a light absorbing layer or a diffuse reflective layer. In addition, in one embodiment, at least one second reflective portion 124 surrounds the light entrance D, and at least one second reflective portion 124 is located at at least one edge of the light entrance D. That is, the second reflective portion 124 can be designed to completely surround the light entrance D or partially surround the light entrance D according to different situations. In this way, when the illumination light beam LB enters the uniform light module 100, the reflection direction of the unnecessary light in the illumination light beam LB can be changed by the design of the shading element 120, such as Figure 4A As shown, the shading element 120 can be designed to absorb or diffuse unwanted light in the illumination beam LB to reduce stray light in the light path returning to the illumination system 50, thereby reducing the energy absorption degree of the optical elements in the illumination system 50, lowering the temperature of the optical elements and increasing their service life.

[0056] Figure 5 FIG. 1 is a cross-sectional diagram of a light homogenization module according to another embodiment of the present invention. Figure 5 The light homogenization module 100A of this embodiment is similar to Figure 4A The difference between the two is that, in this embodiment, the shading element 120A of the light homogenizing module 100A further includes a plurality of heat dissipation fins G, which are disposed on the extension portion 126 and extend in a direction perpendicular to the axis B. In this way, the heat dissipation effect of the light homogenizing module 100A can be increased, thereby maintaining good optical quality.

[0057] Figure 6 FIG. 1 is a cross-sectional diagram of a light homogenization module according to another embodiment of the present invention. Figure 6 The light homogenization module 100B of this embodiment is similar to Figure 4A The light homogenizing module 100 is shown. The difference between the two is that, in the present embodiment, the number of the second reflecting portions 124A in the shading element 120B of the light homogenizing module 100B is multiple, and they are arranged at intervals on the first reflecting portion 122 to form a fin structure. Specifically, in the present embodiment, the first reflecting portion 122 and each of the multiple second reflecting portions 124A are perpendicular to each other. In other embodiments, each of the multiple second reflecting portions 124A may also be inclined toward the axis B or away from the axis B relative to the first reflecting portion 122. In this way, the heat dissipation effect of the light homogenizing module 100B can be increased, thereby maintaining good optical quality. In addition, in other embodiments, the outer surface of each second reflecting portion 124 may also have a functional film layer (such as Figure 4B ), such as a light absorbing layer or a diffuse reflection layer, to reduce the generation of stray light, but the present invention is not limited thereto.

[0058] Figure 7FIG. 1 is a cross-sectional diagram of a light homogenization module according to another embodiment of the present invention. Figure 7 The light homogenization module 100C of this embodiment is similar to Figure 4A The difference between the two is that in the light-shielding element 120C of the light-shielding module 100C of the present embodiment, the extension portion 126 is configured with a plurality of heat dissipation fins G. Figure 5 The second reflector 124A adopts Figure 6 The second reflective portion 124A is multiple in number and is disposed at intervals on the first reflective portion 122 to form a fin structure. In this way, the heat dissipation effect of the light homogenization module 100C can be enhanced, thereby maintaining good optical quality.

[0059] In summary, in the light homogenizing module and the projection device of the present invention, the light homogenizing module includes a light homogenizing element and a shading element arranged on one side of the light incident surface of the light homogenizing element. Among them, the shading element includes a first reflecting portion, at least one second reflecting portion and a light entrance. The second reflecting portion has an opposite first end and a second end, the first end is connected to the first reflecting portion, and the second end is farther away from the light homogenizing element than the first reflecting portion. The light homogenizing element includes an axis perpendicular to the light incident surface, and in a direction parallel to the light incident surface, the distance between the second end and the axis is less than or equal to the distance between the first end and the axis. In this way, the reflection direction of light can be changed by the design of the shading element to reduce stray light in the light path returning to the lighting system, thereby reducing the energy absorption degree of the optical elements in the lighting system, reducing the temperature of the optical elements and increasing the service life.

[0060] The above description is only a preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made in accordance with the claims of the present invention and the specification of the present invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention is not required to achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract of the specification and the name of the invention are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

Claims

1. A light homogenization module, characterized in that: The light homogenization module includes a light homogenization element and a light shielding element, wherein: The light homogenizing element comprises a light incident surface and an axis perpendicular to the light incident surface; and The shading element is disposed on one side of the light incident surface, and the shading element includes a first reflecting portion, at least one second reflecting portion, and a light incident port, wherein: The first reflective portion surrounds the light entrance; The at least one second reflecting portion has a first end and a second end opposite to each other, the first end of the at least one second reflecting portion is connected to the first reflecting portion, and the second end of the at least one second reflecting portion is farther away from the light homogenizing element than the first reflecting portion; and The light entrance exposes the light entrance surface; Wherein, the extension direction of the first reflecting portion is parallel to the light incident surface, and in the direction parallel to the light incident surface, the distance between the second end of the at least one second reflecting portion and the axis is less than or equal to the distance between the first end of the at least one second reflecting portion and the axis.

2. The light homogenization module according to claim 1, characterized in that: The light homogenizing element also includes a surrounding wall and a cavity, the cavity is formed inside the surrounding wall, the light incident surface is located at one end of the cavity, and on a virtual plane parallel to the light incident surface, the orthographic projection of the at least one second reflecting portion in the virtual plane at least partially overlaps with the orthographic projection of the surrounding wall in the virtual plane.

3. The light homogenization module according to claim 1, characterized in that: The light homogenizing element also includes a surrounding wall and a cavity, the cavity is formed inside the surrounding wall, the light incident surface is located at one end of the cavity, and on a virtual plane parallel to the light incident surface, the orthographic projection of the at least one second reflecting portion in the virtual plane does not overlap with the orthographic projection of the cavity in the virtual plane.

4. The light homogenization module according to claim 1, characterized in that: The at least one second reflective portion surrounds the light incident port, and the at least one second reflective portion is located at at least one edge of the light incident port.

5. The light homogenization module according to claim 1, characterized in that: The at least one second reflective portion is plural in number and is disposed at intervals on the first reflective portion to form a fin structure.

6. The light homogenization module according to claim 5, characterized in that: The first reflective portion and each of the plurality of second reflective portions are perpendicular to each other.

7. The light homogenization module according to claim 1, characterized in that: The first reflective portion has a light absorbing layer or a diffuse reflective layer on at least a portion of its surface away from the light homogenizing element.

8. The light homogenization module according to claim 1, characterized in that: At least a portion of the surface of the at least one second reflective portion has a light absorbing layer or a diffuse reflective layer.

9. The light homogenization module according to any one of claims 7 or 8, characterized in that: The light absorbing layer is a black coating, an anodized layer or an anti-reflection coating, and the diffuse reflection layer is a coating with diffuse reflection particles or a structural layer with a rough surface.

10. The light homogenization module according to claim 1, characterized in that: The shading element further includes an extending portion, and the extending portion extends from the first reflecting portion toward the light homogenizing element in a direction parallel to the axis of the light homogenizing element.

11. The light homogenization module according to claim 10, characterized in that: The shading element further includes a plurality of heat dissipation fins, and the plurality of heat dissipation fins are disposed on the extending portion.

12. A projection device, characterized in that: The projection device comprises an illumination system, at least one light valve and a projection lens, wherein: The lighting system is used to provide a lighting beam; The at least one light valve is disposed on a transmission path of the illumination light beam from the illumination system, and is used to convert the illumination light beam into an image light beam; and The projection lens is disposed on the transmission path of the image light beam and is used to project the image light beam out of the projection device. The lighting system includes a light source module and a light homogenization module, wherein the light source module is used to provide the lighting beam, the light homogenization module is configured on the transmission path of the lighting beam, and is used to receive and homogenize the lighting beam, and the light homogenization module includes a light homogenization element and a shading element, wherein: The light homogenizing element comprises a light incident surface and an axis perpendicular to the light incident surface; and The shading element is disposed on one side of the light incident surface, and the shading element includes a first reflecting portion, at least one second reflecting portion, and a light incident port, wherein: The first reflective portion surrounds the light entrance; The at least one second reflecting portion has a first end and a second end opposite to each other, the first end of the at least one second reflecting portion is connected to the first reflecting portion, and the second end of the at least one second reflecting portion is farther away from the light homogenizing element than the first reflecting portion; and The light entrance exposes the light entrance surface, wherein the extension direction of the first reflective portion is parallel to the light entrance surface, and in the direction parallel to the light entrance surface, the distance between the second end of the at least one second reflective portion and the axis is less than or equal to the distance between the first end of the at least one second reflective portion and the axis.

13. The projection device according to claim 12, characterized in that: The light homogenizing element also includes a surrounding wall and a cavity, the cavity is formed inside the surrounding wall, the light incident surface is located at one end of the cavity, and on a virtual plane parallel to the light incident surface, the orthographic projection of the at least one second reflecting portion in the virtual plane at least partially overlaps with the orthographic projection of the surrounding wall in the virtual plane.

14. The projection device according to claim 12, characterized in that: The light homogenizing element also includes a surrounding wall and a cavity, the cavity is formed inside the surrounding wall, the light incident surface is located at one end of the cavity, and on a virtual plane parallel to the light incident surface, the orthographic projection of the at least one second reflecting portion in the virtual plane does not overlap with the orthographic projection of the cavity in the virtual plane.

15. The projection device according to claim 12, characterized in that: The at least one second reflective portion surrounds the light incident port, and the at least one second reflective portion is located at at least one edge of the light incident port.

16. The projection device according to claim 12, characterized in that: The at least one second reflective portion is plural in number and is disposed at intervals on the first reflective portion to form a fin structure.

17. The projection device according to claim 16, characterized in that: The first reflective portion and each of the plurality of second reflective portions are perpendicular to each other.

18. The projection device according to claim 12, characterized in that: The first reflective portion has a light absorbing layer or a diffuse reflective layer on at least a portion of its surface away from the light homogenizing element.

19. The projection device according to claim 12, characterized in that: At least a portion of the surface of the at least one second reflective portion has a light absorbing layer or a diffuse reflective layer.

20. The projection device according to any one of claims 18 or 19, characterized in that: The light absorbing layer is a black coating, an anodized layer or an anti-reflection coating, and the diffuse reflection layer is a coating with diffuse reflection particles or a structural layer with a rough surface.

21. The projection device according to claim 12, characterized in that: The shading element further includes an extending portion, and the extending portion extends from the first reflecting portion toward the light homogenizing element in a direction parallel to the axis of the light homogenizing element.

22. The projection device according to claim 21, characterized in that: The shading element further includes a plurality of heat dissipation fins, and the plurality of heat dissipation fins are disposed on the extending portion.

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