Illumination system and projection device

Abstract

A lighting system comprises an excitation light source, a wavelength conversion device, a first light splitting module, a second light splitting module, a first dodging element and a second dodging element. The excitation light source is used for providing a laser beam. The wavelength conversion device is used for converting the laser beam into a stimulated laser beam or a reflected laser beam in different time sequences. The first light splitting module is used for reflecting a first sub-laser beam in the laser beam from the wavelength conversion device to the first dodging element. The second light splitting module is used for reflecting the second sub-laser beam from the first light splitting module to the second dodging element. The illumination light beam comprises a first sub-laser beam, a second sub-laser beam and an excited light beam. The invention further provides a projection device comprising the illumination system. According to the illumination system and the projection device provided by the invention, more blue light can pass through the center of the dodging element, and the uniformity of the blue light in the illumination light beam is improved.

Description

Technical Field

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

[0002] Projection devices are display devices used to produce large-size images. With the evolution and innovation of science and technology, they have been continuously improving. The imaging principle of projection devices is to convert the illumination beam generated by the lighting system into an image beam through a light valve, and then project the image beam to the projection target (such as a screen or a wall) through a projection lens to form a projection image. In addition, the lighting system has also evolved from ultra-high-performance lamps (UHP lamps) and light-emitting diodes (LEDs) to the most advanced laser diode (LD) light sources, and even packaged light sources formed by all-in-one laser diodes have been introduced to make the internal configuration of the projection device more compact and the optical performance better.

[0003] In current light-combining systems, the design of the beam path causes the blue light to enter the light integrating column at a large angle, so there is no or less blue light distributed at the center angle of the light integrating column, resulting in poor uniformity of the blue light. In addition, since the converted stimulated light and blue light pass through the same light integrating column, it is impossible to optimize the uniformity of the stimulated light and blue light separately.

[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 known technologies that are not known to those skilled in the art. The content disclosed in the "background technology" section does not mean that the content or the problems to be solved by one or more embodiments of the present invention have 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 an illumination system and a projection device, which can allow more blue light to pass through the center of a light homogenizing element, thereby improving the uniformity of blue light in an illumination beam, and solving the problem of less blue light distribution in the central angle spatial distribution of a light homogenizing element under a known optical architecture.

[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 an illumination system for providing an illumination beam. The illumination system includes an excitation light source, a wavelength conversion device, a first beam splitting module, a second beam splitting module, a first light homogenizing element, and a second light homogenizing element. Among them, the excitation light source is used to provide a laser beam. The wavelength conversion device is disposed on the transmission path of the laser beam and is used to convert the laser beam into an excited beam or reflect the laser beam at different time sequences. The first beam splitting module is disposed between the wavelength conversion device and the second beam splitting module, and is used to allow the laser beam from the excitation light source to pass through, reflect the first sub-laser beam in the laser beam from the wavelength conversion device to the first light homogenizing element, and allow the second sub-laser beam in the laser beam from the wavelength conversion device to pass through. The second beam splitting module is disposed between the excitation light source and the first beam splitting module, and is used to allow the laser beam from the excitation light source to pass through, and reflect the second sub-laser beam from the first beam splitting module to the second light homogenizing element. The first light homogenizing element is disposed on the transmission path of the first sub-laser beam from the first beam splitting module. The second light homogenizing element is disposed on the transmission path of the second sub-laser beam from the second beam splitting module. The illumination beam includes a first sub-laser beam, a second sub-laser beam, and an excited beam.

[0008] To achieve one or part or all of the above purposes or other purposes, the present invention further provides a projection device, including an illumination system, at least one light valve, and a projection lens. Among them, the illumination system is used to provide an illumination beam. The illumination system includes an excitation light source, a wavelength conversion device, a first beam splitting module, a second beam splitting module, a first light homogenizing element, and a second light homogenizing element. Among them, the excitation light source is used to provide a laser beam. The wavelength conversion device is disposed on the transmission path of the laser beam and is used to convert the laser beam into an excited beam or reflect the laser beam at different time sequences. The first beam splitting module is disposed between the wavelength conversion device and the second beam splitting module, and is used to allow the laser beam from the excitation light source to pass through, reflect the first sub-laser beam in the laser beam from the wavelength conversion device to the first light homogenizing element, and allow the second sub-laser beam in the laser beam from the wavelength conversion device to pass through. The second beam splitting module is disposed between the excitation light source and the first beam splitting module, and is used to allow the laser beam from the excitation light source to pass through, and reflect the second sub-laser beam from the first beam splitting module to the second light homogenizing element. The first light homogenizing element is disposed on the transmission path of the first sub-laser beam from the first beam splitting module. The second light homogenizing element is disposed on the transmission path of the second sub-laser beam from the second beam splitting module. The illumination beam includes a first sub-laser beam, a second sub-laser beam, and an excited beam. At least one light valve is disposed on the transmission path of the illumination beam and is used to convert the illumination beam into an image beam. The projection lens is disposed on the transmission path of the image beam and is used to project the image beam out of the projection device.

[0009] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the lighting system and projection device of the present invention, the lighting system includes an excitation light source, a wavelength conversion device, a first beam splitting module, a second beam splitting module, a first light homogenizing element, and a second light homogenizing element. Among them, the laser beam provided by the excitation light source generates a first sub-laser beam and a second sub-laser beam through the optical action of the first beam splitting module and the second beam splitting module, and are respectively transmitted to the first light homogenizing element and the second light homogenizing element, thereby forming the blue light part of the illumination beam. In this way, more blue light can pass through the center of the light homogenizing element, improving the uniformity of blue light in the illumination beam to solve the problem of less blue light distribution in the central angular space distribution of the light homogenizing element under the known optical architecture.

[0010] To make the above features and advantages of the present invention more obvious and understandable, specific embodiments are given below and described in detail in conjunction with the accompanying drawings as follows. Brief Description of the Drawings

[0011] Figures 1A to 1D Schematic diagrams of the projection device according to an embodiment of the present invention at different time sequences.

[0012] Figure 2 For Figure 1A Schematic diagram of the wavelength conversion device of the projection device.

[0013] Figure 3 For Figure 1A Schematic diagram of the first filter device of the projection device.

[0014] Figure 4 Schematic diagram of the lighting system according to another embodiment of the present invention.

[0015] Figure 5 Schematic diagram of the lighting system according to another embodiment of the present invention.

[0016] Figure 6 Schematic diagram of the lighting system according to another embodiment of the present invention.

[0017] Figure 7 Schematic diagram of the lighting system according to another embodiment of the present invention.

[0018] Figure 8 Schematic diagram of the lighting system according to another embodiment of the present invention.

[0019] Figure 9 Schematic diagram of the lighting system according to another embodiment of the present invention.

[0020] Figure 10 Schematic diagram of the lighting system according to another embodiment of the present invention. Detailed Description of the Embodiments

[0021] The foregoing 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 accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, or rear, etc., are only with reference to the directions of the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the present invention.

[0022] Figures 1A to 1D They are respectively schematic diagrams of a projection device according to an embodiment of the present invention at different time sequences. Please first refer to Figure 1A . This embodiment provides a projection device 10, including an illumination system 100, at least one light valve 60, and a projection lens 70. Among them, the illumination system 100 is used to provide an illumination beam LB. At least one light valve 60 is disposed on the transmission path of the illumination beam LB 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.

[0023] The light valve 60 is, for example, a reflective light modulator such as a Liquid Crystal On Silicon panel (LCoS panel), a Digital Micro-mirror Device (DMD), etc. In some embodiments, the light valve 60 can 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 type and kind of the light valve 60. The method for the light valve 60 to convert the illumination beam LB into an image beam LI can, for example, use a total reflection prism 80 (TIR prism or RTIR prism) for beam guiding. Its detailed steps and implementation manners can obtain sufficient teachings, suggestions, and implementation descriptions from the common knowledge in the technical field, so it will not be elaborated here. In different embodiments, the number of the light valves 60 can be designed to be one to three, and the present invention is not limited thereto.

[0024] 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 including biconcave lenses, biconvex lenses, convex-concave lenses, concave-convex lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 70 may further include a planar optical lens to project the image light beam LI from the light valve 60 to the projection target in a reflective manner. The present invention does not limit the type and variety of the projection lens 70. In addition, in the optical path from the illumination system 100 to the projection lens 70, different types and numbers of optical elements may be configured according to different body designs to guide the transmission direction of the light beam. For example, optical elements such as a mirror 52, a beam splitter 56, and an optical lens 58 may be configured, and the present invention is not limited thereto.

[0025] The illumination system 100 includes an excitation light source 110, a wavelength conversion device 120, a first beam splitting module 130, a second beam splitting module 140, a first light homogenizing element 150, and a second light homogenizing element 160. Among them, the excitation light source 110 is used to provide a laser beam L1. The excitation light source 110 includes at least one light emitting diode (LED), at least one laser diode (LD), or a combination of the two. Specifically, in this embodiment, the excitation light source 110 is at least one blue laser diode (Blue LD), and the laser beam L1 is, for example, a blue laser.

[0026] Figure 2 is Figure 1A a schematic diagram of the wavelength conversion device of the projection device. Please refer to Figure 1A and Figure 2 . The wavelength conversion device 120 is disposed on the transmission path of the laser beam L1 and is used to convert the laser beam L1 into an excited light beam L2 or reflect the laser beam L1 at different time sequences. The wavelength conversion device 120 is, for example, a color wheel structure, including at least one first wavelength conversion region 121 and at least one reflection region 122 arranged in a staggered manner with the rotation axis A1 as the center. The wavelength conversion device 120 includes a driving member (not labeled), and the driving member is, for example, a motor that drives the wavelength conversion device 120 to rotate around the rotation axis A1 to make at least one first wavelength conversion region 121 and at least one reflection region 122 cut into the transmission path of the laser beam L1 at different time sequences. In this embodiment, the wavelength conversion device 120 has two first wavelength conversion regions 121 and two reflection regions 122 symmetrically arranged with the rotation axis A1 as the center, and the number of the first wavelength conversion regions 121 and the reflection regions 122 is not limited. The first wavelength conversion region 121 is, for example, provided with a yellow fluorescent material to convert the blue laser beam L1 into a yellow excited light beam L2. The reflection region 122 is, for example, a substrate with high reflection characteristics or is provided with a mirror to reflect the laser beam L1.

[0027] In this embodiment, the first wavelength conversion region 121 can be further designed and divided into a first sub-wavelength conversion region 124 and a second sub-wavelength conversion region 126. The first sub-wavelength conversion region 124 is provided with, for example, a green fluorescent material to convert the blue laser beam L1 into a green excited beam L2, so as to further increase the color gamut in the green band. However, in different embodiments, the green part in the illumination beam LB can still be obtained by the method of yellow light color separation, and the present invention is not limited thereto. The second sub-wavelength conversion region 126 is provided with, for example, a yellow or red fluorescent material to convert the blue laser beam L1 into a yellow or red excited beam L2. Specifically, when the second sub-wavelength conversion region 126 is a yellow fluorescent material, the corresponding converted excited beam L2 is yellow, and the red part in the illumination beam LB can be obtained by the method of yellow light color separation; when the second sub-wavelength conversion region 126 is a red fluorescent material, the corresponding converted excited beam L2 is red, so as to further increase the color gamut in the red band of the illumination beam.

[0028] In addition, the wavelength conversion device 120 further includes at least one second wavelength conversion region 128, and the number thereof is not limited thereto. In this embodiment, the two second wavelength conversion regions 128 are symmetrically arranged with the rotation axis A1 as the center, and are provided with, for example, a yellow fluorescent material to convert the blue laser beam L1 into a yellow excited beam L2, so as to further enhance the yellow part in the illumination beam LB to improve the overall brightness. At least one first wavelength conversion region 121, at least one second wavelength conversion region 128 and at least one reflection region 122 of the wavelength conversion device 120 are, for example, jointly arranged in a ring shape with the rotation axis A1 as the center. In one embodiment, the conversion wavelength of the second wavelength conversion region 128 can be designed to be different from the conversion wavelength of the first wavelength conversion region 121 (or the second sub-wavelength conversion region 126). For example, the conversion wavelength of the second wavelength conversion region 128 can be designed to be shorter than the conversion wavelength of the second sub-wavelength conversion region 126, so that the blue laser beam L1 is converted into a yellow excited beam L2 with a shorter wavelength by the second wavelength conversion region 128 to facilitate brightness improvement, and the blue laser beam L1 is converted into a yellow excited beam L2 with a longer wavelength by the second sub-wavelength conversion region 126 to facilitate the generation of more red light in the subsequent optical path. However, in some embodiments, the conversion wavelength of the second wavelength conversion region 128 can also be designed to be the same as the conversion wavelength of the first wavelength conversion region 121 (or the second sub-wavelength conversion region 126), for example, using the same wavelength conversion material, but the present invention is not limited thereto.

[0029] Please continue to refer to Figures 1A to 1D. The first beam splitting module 130 is disposed between the wavelength conversion device 120 and the second beam splitting module 140, and is configured to allow the laser beam L1 from the excitation light source 110 to pass through, and reflect the first sub-laser beam L11 in the laser beam L1 from the wavelength conversion device 120 to the first light homogenizing element 150, and allow the second sub-laser beam L12 in the laser beam L1 from the wavelength conversion device 120 to pass through (as Figure 1D shown). Among them, the first sub-laser beam L11 is a part of the laser beam L1 from the wavelength conversion device 120, and the second sub-laser beam L12 is another part of the laser beam L1 from the wavelength conversion device 120. In this embodiment, the first beam splitting module 130 includes a first beam splitting element 132 and a semi-reflective and semi-transmissive element 134. Among them, the first beam splitting element 132 is disposed between the semi-reflective and semi-transmissive element 134 and the wavelength conversion device 120, and is configured to reflect the first part L21 of the excited beam L2, so that the first part L21 of the excited beam L2 is transmitted toward the first light homogenizing element 150, and allow the second part L22 of the excited beam L2 and the laser beam L1 to pass through, where the wavelength of the first part L21 is different from the wavelength of the second part L22. In this embodiment, the first beam splitting element 132 is, for example, a dichroic mirror with green reflect (DMG).

[0030] The semi-reflective and semi-transmissive element 134 is disposed between the first beam splitting element 132 and the second beam splitting module 140, and is configured to allow the second sub-laser beam L12 in the laser beam L1 from the first beam splitting element 132 and the second part L22 of the excited beam L2 to pass through, and reflect the first sub-laser beam L11 in the laser beam L1 from the first beam splitting element 132 to the first light homogenizing element 150. More specifically, in this embodiment, the semi-reflective and semi-transmissive element 134 includes a semi-reflective and semi-transmissive region 134_1 and a fully transmissive region 134_2 disposed adjacent to each other. Among them, the semi-reflective and semi-transmissive region 134_1 is located on the transmission path of the laser beam L1 from the first beam splitting element 132, and is configured to allow the second sub-laser beam L12 in the laser beam L1 from the first beam splitting element 132 and the second part L22 of the excited beam L2 to pass through (as Figure 1A , Figure 1B and Figure 1D shown), and reflect the first sub-laser beam L11 in the laser beam L1 from the first beam splitting element 132 (as Figure 1DAs shown). In this embodiment, the semi-reflective semi-transmissive region 134_1 is, for example, a semi-transmissive semi-reflective mirror for blue light, that is, it has the semi-transmissive semi-reflective characteristic only for the laser beam L1 and has the completely transmissive characteristic for the excited beam L2. The fully transmissive region 134_2 is located on the transmission path of the laser beam L1 between the excitation light source 110 and the wavelength conversion device 120 for allowing the laser beam L1 to pass through. In this embodiment, the fully transmissive region 134_2 is, for example, a light-transmissive flat plate, an air frame, or no component is provided, and the present invention is not limited thereto.

[0031] The second beam splitting module 140 is disposed between the excitation light source 110 and the first beam splitting module 130 for allowing the laser beam L1 from the excitation light source 110 to pass through and reflecting the second sub-laser beam L12 from the first beam splitting module 130 to the second light homogenizing element 160 (such as Figure 1D As shown). In this embodiment, the second beam splitting module 140 includes a second beam splitting element 142 and a reflecting element 144. The second beam splitting element 142 is disposed between the reflecting element 144 and the first beam splitting module 130 for reflecting the second part L22 of the excited beam L2 from the first beam splitting module 130 (such as Figure 1A And Figure 1B As shown), so that the second part L22 of the excited beam L2 is transmitted toward the second light homogenizing element 160 and allowing the second sub-laser beam L12 from the first beam splitting module 130 to pass through (such as Figure 1DAs shown. In this embodiment, the second beam splitting element 142 includes a semi-reflective and semi-transmissive region 142_1 and a fully transmissive region 142_2, and its implementation is similar to the semi-reflective and semi-transmissive region 134_1 and the fully transmissive region 134_2 of the semi-reflective and semi-transmissive element 134, so it will not be elaborated here. It should only be noted that the semi-reflective and semi-transmissive region 142_1 of the second beam splitting element 142 is, for example, a semi-transmissive and semi-reflective mirror for blue light. However, the difference between the semi-reflective and semi-transmissive region 142_1 of the second beam splitting element 142 and the semi-reflective and semi-transmissive region 134_1 of the semi-reflective and semi-transmissive element 134 is that the semi-reflective and semi-transmissive region 142_1 of the second beam splitting element 142 only has the semi-transmissive and semi-reflective characteristic for the laser beam L1, and has the completely reflective characteristic for the excited beam L2 (or the second sub-laser beam L12). In other embodiments, the second beam splitting element 142 is, for example, a single dichroic mirror with green and red reflect (DMGR), but it is not limited to the foregoing examples. The reflecting element 144 is disposed between the second beam splitting element 142 and the excitation light source 110, and is used to reflect the second sub-laser beam L12 from the first beam splitting module 130 to the second light homogenizing element 160. The reflecting element 144 is, for example, a mirror. Therefore, in this embodiment, the laser beam L1 from the wavelength conversion device 120 can be split into a first sub-laser beam L11 and a second sub-laser beam L12 by the first beam splitting module 130 and the second beam splitting module 140, so as to guide different parts of the laser beam L1 to enter the first light homogenizing element 150 and the second light homogenizing element 160 at different angles respectively. Specifically, the first sub-laser beam L11 reflected by the first beam splitting module 130 has more laser beams L1 with a central angle spatial distribution, that is, more laser beams L1 in the first sub-laser beam L11 will enter the center of the first light homogenizing element 150; the second sub-laser beam L12 reflected by the second beam splitting module 140 has more laser beams L1 with a large angle entering the second light homogenizing element 160. In this way, the light quantity of the laser beam (blue light) with a central angle spatial distribution can be effectively improved.

[0032] The first light homogenizing element 150 and the second light homogenizing element 160 are, for example, integrating cylinders, which are used to adjust the spot shape of the light beam so that the spot shape of the illumination light beam LB can match the shape of the working area of the light valve 60 (e.g., rectangular), and to make the light intensity at each part of the spot consistent or close, and to evenly illuminate the light intensity of the illumination light beam LB. The first light homogenizing element 150 is arranged on the transmission path of the first sub-laser beam L11 from the first beam splitting module 130, and the second light homogenizing element 160 is arranged on the transmission path of the second sub-laser beam L12 from the second beam splitting module 140. The illumination light beam LB includes the first sub-laser beam L11, the second sub-laser beam L12, and the excited light beam L2. It is worth mentioning that under the optical action of the above-mentioned first beam splitting module 130 and second beam splitting module 140, the incident angle of the first sub-laser beam L11 entering the first light homogenizing element 150 is different from the incident angle of the second sub-laser beam L12 entering the second light homogenizing element 160. In this way, more blue light can pass through the center of the light homogenizing element, thereby improving the uniformity of blue light in the illumination light beam LB and solving the problem of less blue light distribution in the central angular space distribution of the light homogenizing element in the known optical architecture.

[0033] Figure 3 is Figure 1A a schematic diagram of the first filter device of the projection device. Please refer to Figures 1A to 1D and Figure 3In addition, in the present embodiment, the lighting system 100 further includes a first filter device 170 disposed between the first beam splitting module 130 and the first light homogenizing element 150, and disposed between the second beam splitting module 140 and the second light homogenizing element 160. Specifically, the first filter device 170 is, for example, a color wheel structure, and the two symmetric regions on both sides of its disk are respectively located on the light transmission paths from the first beam splitting module 130 to the first light homogenizing element 150 and from the second beam splitting module 140 to the second light homogenizing element 160. The first filter device 170 includes a driving member (not labeled), and the driving member is, for example, a motor for driving the first filter device 170 to rotate about the rotation axis A2. In the present embodiment, the first filter device 170 includes two first filter regions 172, two second filter regions 174, and two light transmission regions 176 that are symmetrically arranged and staggeredly arranged about the rotation axis A2. Among them, the two first filter regions 172 are, for example, filters that only allow green light to pass through or block all wavelengths of light except green light, and are used to receive the first part L21 of the excited light beam L2 and generate a first color light (i.e., green light), and the excited light beam L2 further includes this first color light. The two second filter regions 174 are, for example, filters that only allow red light to pass through or block all wavelengths of light except red light, and are used to receive the second part L22 of the excited light beam L2 and generate a second color light (i.e., red light), and the excited light beam L2 further includes this second color light. The two light transmission regions 176 are, for example, light transmissive members made of any material such as hollow, glass, or containing diffusing particles, and are used to allow the first sub-laser beam L11 and the second sub-laser beam L12 to pass through respectively. In the present embodiment, the first filter device 170 further includes two third filter regions 178 that are symmetrically arranged about the rotation axis A2, for example, filters that only allow red, yellow, and green light to pass through or only block blue light, and are used to allow the excited light beam L2 to pass through and generate the first color light and the second color light.

[0034] In addition, the rotation speed of the wavelength conversion device 120 is correlated with the rotation speed of the first filter device 170. Specifically, in this embodiment, since the wavelength conversion device 120 has two first wavelength conversion regions 121 (two first sub-wavelength conversion regions 124 and two second sub-wavelength conversion regions 126), two reflection regions 122, and two second wavelength conversion regions 128 that are symmetrically arranged about the rotation axis A1, corresponding to two first filter regions 172, two second filter regions 174, two light-transmitting regions 176, and two third filter regions 178 that are symmetrically arranged about the rotation axis A2 in the first filter device 170, when the rotation speeds of the wavelength conversion device 120 and the first filter device 170 are the same, in different time sequences, the first sub-wavelength conversion region 124 of the wavelength conversion device 120 corresponds to the first filter region 172 of the first filter device 170, the second sub-wavelength conversion region 126 of the wavelength conversion device 120 corresponds to the second filter region 174 of the first filter device 170, the second wavelength conversion region 128 of the wavelength conversion device 120 corresponds to the third filter region 178 of the first filter device 170, and the reflection region 122 of the wavelength conversion device 120 corresponds to the light-transmitting region 178 of the first filter device 170. However, in other embodiments, the wavelength conversion device may also have a first wavelength conversion region (a first sub-wavelength conversion region and a second sub-wavelength conversion region), a reflection region 122, and a second wavelength conversion region 128 that are arranged about the rotation axis. In this case, the rotation speeds of the wavelength conversion device and the first filter device 170 will be different. It should be noted that in different time sequences, each region in the wavelength conversion device needs to be matched with the corresponding region in the first filter device 170 as described above.

[0035] Therefore, please refer to Figure 1A 、 Figure 2 and Figure 3。When in the red light timing, if the second sub-wavelength conversion region 126 of the first wave conversion region 121 uses a yellow fluorescent material, the laser beam L1 is sequentially transmitted by the excitation light source 110 through the second beam splitting element 142 (fully penetrating region 142_2), the fully penetrating region 134_2 of the semi-reflective and semi-transmissive element 134 of the first beam splitting module 130, and the first beam splitting element 132 to the second sub-wavelength conversion region 126 of the wavelength conversion device 120 to convert a yellow excited beam L2. The yellow excited beam L2 is split into a green first part L21 and a red second part L22 when transmitted to the first beam splitting element 132. Among them, the excited beam L2 of the green first part L21 is blocked and filtered after being reflected by the first beam splitting element 132 and transmitted to the second filtering region 174 of the first filtering device 170. The excited beam L2 of the red second part L22 is transmitted through the semi-reflective and semi-transmissive element 134 of the first beam splitting module 130, reflected by the second beam splitting element 142, and transmitted to the second filtering region 174 of the first filtering device 170 to form a second color light. At this time, the second filtering region 174 can filter the excited beam L2 of the red second part L22 into red light with a better color gamut to be transmitted into the second light homogenizing element 160, and then provide the red light part of the illumination beam LB. In another embodiment, if the second sub-wavelength conversion region 126 of the first wavelength conversion region 121 uses a red fluorescent material, the laser beam L1 will convert a red excited beam L2 in the second sub-wavelength conversion region 126 of the wavelength conversion device 120. At this time, the light transmission path of the red excited beam L2 is the same as that of the excited beam L2 of the red second part L22 described above, and will not be elaborated here.

[0036] Please refer to Figure 1B 、 Figure 2 and Figure 3。During the yellow light timing, the laser beam L1 is sequentially transmitted by the excitation light source 110 through the second beam splitting element 142 (fully transmissive region 142_2), the fully transmissive region 134_2 of the semi-reflective and semi-transmissive element 134 of the first beam splitting module 130, and the first beam splitting element 132 to the second wavelength conversion region 128 of the wavelength conversion device 120 to convert into a yellow excited beam L2. The yellow excited beam L2 is split into a first green part L21 and a second red part L22 when transmitted to the first beam splitting element 132. Among them, the excited beam L2 of the first green part L21 is reflected by the first beam splitting element 132 and then transmitted through the third filter region 178 of the first filter device 170 to form a first color light (i.e., green light), and then transmitted into the first light homogenizing element 150. The excited beam L2 of the second red part L22 is transmitted through the semi-reflective and semi-transmissive element 134 of the first beam splitting module 130, reflected by the second beam splitting element 142, and transmitted to the third filter region 178 of the first filter device 170 to form a second color light (i.e., red light), and then transmitted into the second light homogenizing element 160. Finally, through the light combining action of subsequent optical elements, it is formed into yellow light, and then the yellow part of the illumination beam LB is provided.

[0037] Please refer to Figure 1C 、 Figure 2 and Figure 3 。During the green light timing, the laser beam L1 is sequentially transmitted by the excitation light source 110 through the second beam splitting element 142 (fully transmissive region 142_2), the fully transmissive region 134_2 of the semi-reflective and semi-transmissive element 134 of the first beam splitting module 130, and the first beam splitting element 132 to the first sub-wavelength conversion region 124 of the wavelength conversion device 120 to convert into a green excited beam L2. The green excited beam L2 is reflected by the first beam splitting element 132 and then transmitted to the first filter region 172 of the first filter device 170 to form a first color light. At this time, the first filter region 172 can filter the green excited beam L2 into green light with better color gamut, and then transmitted into the first light homogenizing element 150, and then the green part of the illumination beam LB is provided. In another embodiment, if the first sub-wavelength conversion region 124 of the first wave conversion region 121 uses a yellow fluorescent material, the laser beam L1 will convert into a yellow excited beam L2 in the first sub-wavelength conversion region 124 of the wavelength conversion device 120. At this time, the yellow excited beam L2 will be split into a first green part L21 and a second red part L22 when passing through the first beam splitting element 132, and its light transmission path is the same as the foregoing and will not be elaborated here. It should be noted that the excited beam L2 of the first green part L21 will form a first color light in the first filter region 172 of the first filter device 170, and the excited beam L2 of the second red part L22 will be blocked and filtered in the first filter region 172 of the first filter device 170.

[0038] Please refer toFigure 1D , Figure 2 and Figure 3 . When in the blue light timing, the laser beam L1 is sequentially transmitted by the excitation light source 110 through the second beam splitting element 142 (fully transmissive region 142_2), the fully transmissive region 134_2 of the semi-reflective and semi-transmissive element 134 of the first beam splitting module 130, and the first beam splitting element 132 to the reflective region 122 of the wavelength conversion device 120 to reflect the laser beam L1. The reflected laser beam L1 will be transmitted through the first beam splitting element 132 to the semi-reflective and semi-transmissive element 134. When the laser beam L1 is transmitted to the semi-reflective and semi-transmissive element 134, the first sub-laser beam L11 is reflected and the second sub-laser beam L12 is allowed to pass through, where the first sub-laser beam L11 is transmitted through the light transmissive region 176 of the first filter device 170 and enters the first light homogenizing element 150. The second sub-laser beam L12 is reflected by the second beam splitting module 140 and transmitted to the light transmissive region 176 of the first filter device 170 and enters the second light homogenizing element 160. The laser beams L1 entering the first light homogenizing element 150 and the second light homogenizing element 160 will be integrated by subsequent optical elements to provide the blue light part of the illumination beam LB. In this embodiment, since the second beam splitting element 142 includes a semi-reflective and semi-transmissive region 142_1 and a fully transmissive region 142_2, when the second sub-laser beam L12 passes through the semi-reflective and semi-transmissive region 142_1 of the second beam splitting element 142, part of the second sub-laser beam L12 will be reflected and enter the light transmissive region 176 of the first filter device 170, and the other part of the second sub-laser beam L12 will pass through the semi-reflective and semi-transmissive region 142_1 and be reflected by the reflecting element 144 and enter the light transmissive region 176 of the first filter device 170. Thereby, laser beams L1 with different incident light angles can be generated to enter the light homogenizing element, that is, the incident light angle of the first sub-laser beam L11 entering the first light homogenizing element 150 is different from the incident light angle of the second sub-laser beam L12 entering the second light homogenizing element 160, which can make more blue light pass through the center of the light homogenizing element, thereby improving the uniformity of blue light in the illumination beam LB.

[0039] Figure 4 is a schematic diagram of an illumination system according to another embodiment of the present invention. Please refer to Figure 4 . Among them Figure 4 shows the light transmission path in the blue light timing. The illumination system 100A shown in this embodiment is similar to Figure 1AThe lighting system 100. The difference between the two is that, in this embodiment, the first beam splitting module 130A includes a first beam splitting element 132A and a semi-reflective and semi-transmissive element 134A. The first beam splitting element 132A includes a semi-reflective and semi-transmissive region 132_1 that reflects green light and is semi-transmissive and semi-reflective to blue light, and a fully transmissive region 132_2. The semi-reflective and semi-transmissive element 134A only includes a semi-reflective and semi-transmissive region 134_1. The second beam splitting module 140A includes a second beam splitting element 142A and a reflective element 144. The second beam splitting element 142A is a pure green and red light reflecting beam splitter. In this way, a larger number of first sub-laser beams L11 with different angles can enter the first light homogenizing element 150, and a larger number of second sub-laser beams L12 with a central angle spatial distribution can enter the second light homogenizing element 160, allowing more blue light to pass through the center of the light homogenizing element, thereby improving the uniformity of blue light in the illumination beam to solve the problem of less blue light distribution in the central angle spatial distribution of the light homogenizing element in the known optical architecture.

[0040] Figure 5 Schematic diagram of a lighting system according to another embodiment of the present invention. Please refer to Figure 5 Among them Figure 5 shows the light transmission path during the blue light timing. The lighting system 100B shown in this embodiment is similar to Figure 1A the lighting system 100. The difference between the two is that, in this embodiment, the first beam splitting module 130B only includes the first beam splitting element 132A as in Figure 4 the embodiment. The second beam splitting module 140B only includes a second beam splitting element 142B, and the second beam splitting element 142B includes a reflection region 142_1A and a fully transmissive region 142_2 as in Figure 1A the embodiment, where the reflection region 142_1A is used to reflect all band beams. In this way, a larger number of first sub-laser beams L11 and second sub-laser beams L12 with different angles can enter the corresponding first light homogenizing element 150 and second light homogenizing element 160 respectively, allowing more blue light to pass through the center of the light homogenizing element, thereby improving the uniformity of blue light in the illumination beam to solve the problem of less blue light distribution in the central angle spatial distribution of the light homogenizing element in the known optical architecture.

[0041] Figure 6 Schematic diagram of a lighting system according to another embodiment of the present invention. Please refer to Figure 6 Among them Figure 6 shows the light transmission path during the blue light timing. The lighting system 100C shown in this embodiment is similar to Figure 5 the lighting system 100B. The difference between the two is that, in this embodiment, Figure 5 the second beam splitting module 140B of Figure 4The second beam splitting module 140A of the embodiment. In this embodiment, the reflection element 144 can be arranged deviating from the center of the second light homogenizing element 160. In this way, a larger number of first sub-laser beams L11 and second sub-laser beams L12 with different angles can be generated and enter the corresponding first light homogenizing element 150 and second light homogenizing element 160 respectively, so that more blue light can pass through the center of the light homogenizing element, thereby improving the uniformity of blue light in the illumination beam and solving the problem of less blue light distribution in the central angular space distribution of the light homogenizing element in the known optical architecture.

[0042] Figure 7 Schematic diagram of an illumination system according to another embodiment of the present invention. Please refer to Figure 7 . Among them Figure 7 shows the light transmission path at the blue light timing. The illumination system 100C shown in this embodiment is similar to Figure 1A the illumination system 100. The difference between the two is that in this embodiment, the first beam splitting module 130C only includes the first beam splitting element 132. In this way, more blue light can pass through the center of the light homogenizing element, thereby improving the uniformity of blue light in the illumination beam and solving the problem of less blue light distribution in the central angular space distribution of the light homogenizing element in the known optical architecture.

[0043] Figure 8 Schematic diagram of an illumination system according to another embodiment of the present invention. Please refer to Figure 2 , Figure 3 and Figure 8 . The illumination system 100E shown in this embodiment is similar to Figure 1A the illumination system 100. For the convenience of description, Figure 8 the light transmission path is not shown, and the light transmission path described below can be referred to Figures 1A to 1DThe difference between the two is that, in this embodiment, the lighting system 100E further includes a second filtering device 180. The second filtering device 180 includes a filter 182, which is configured to be located between the first splitting module 130 and the first light homogenizing element 150. For example, in this embodiment, the filter 182 is, for example, a green light filter that allows the blue light band to pass through, so as to allow the laser beam L1 and the first part L21 of the excited beam L2 to pass through. Specifically, compared with the first filtering region 172 in the first filtering device 170, the filter 182 in the second filtering device 180 can filter green light with a narrower band range, making the green light of the first part L21 of the excited light beam L2 passing through the filter 182 purer. The filter 182 can be directly fixedly disposed on the light transmission path between the first splitting module 130 and the first light homogenizing element 150, or a switching element (not shown) can actively switch the filter 182 to the light transmission path between the first splitting module 130 and the first light homogenizing element 150 according to different scenario modes. Therefore, when the second filtering device 180 is disposed between the first splitting module 130 and the first light homogenizing element 150, the first part L21 of the excited beam L2 from the first splitting module 130 passes through the filter 182 of the second filtering device 180 and the first filtering region 172 corresponding to the position of the first light homogenizing element 150 in the first filtering device 170 to generate a first color light (i.e., green light with a better color gamut). The first sub-laser beam L11 of the laser beam L1 from the first splitting module 130 passes through the filter 182 of the second filtering device 180 and the light-transmitting region 176 corresponding to the position of the first light homogenizing element 150 in the first filtering device 170 to be transmitted to the first light homogenizing element 150. In this way, the composition of the green light can be made purer, thereby improving the green light color gamut. It should be noted that, in this embodiment, the second filtering device 180 is specifically configured to be located between the first splitting module 130 and the first filtering device 170. However, in other embodiments, the second filtering device 180 can also be disposed between the first filtering device 170 and the first light homogenizing element 150, and the present invention is not limited thereto.

[0044] Figure 9 Schematic diagram of a lighting system according to another embodiment of the present invention. Please refer to Figure 2 、 Figure 3 and Figure 9 。This embodiment shows that the lighting system 100F is similar to Figure 1A the lighting system 100. For the convenience of description, Figure 9 the light transmission path is not shown, and the light transmission path described below can be referred to Figures 1A to 1DThe difference between the two is that in this embodiment, the lighting system 100F further includes a second filter device 180A. The second filter device 180A includes a filter 182A, which is configured to be located between the second beam splitting module 140 and the second light homogenizing element 160. For example, in this embodiment, the filter 182A is, for example, a red light filter that allows the blue light band to pass through, so as to allow the second part L22 of the laser beam L1 and the excited beam L2 to pass through. Specifically, compared with the second filter region 174 in the first filter device 170, the filter 182A in the second filter device 180A can filter red light with a narrower band range, making the red light of the second part L22 of the excited light L2 passing through the filter 182A purer. The filter 182A can be directly fixedly disposed on the light transmission path between the second beam splitting module 140 and the second light homogenizing element 160, or a switching element (not shown) can actively switch the filter 182A to the light transmission path between the second beam splitting module 140 and the second light homogenizing element 160 according to different scenario modes. In other words, in one embodiment, Figure 8 the lighting system 100E and Figure 9 the lighting system 100F can adopt the same architecture, and a switching element can actively switch the filter 182 / 182A to the light transmission path between the first beam splitting module 130 and the first light homogenizing element 150 or to the light transmission path between the second beam splitting module 140 and the second light homogenizing element 160 according to different scenario modes. The present invention is not limited thereto. Therefore, when the second filter device 180 is disposed between the second beam splitting module 140 and the second light homogenizing element 160, the second part L22 of the excited beam L2 from the second beam splitting module 140 passes through the filter 182A of the second filter device 180A and the second filter region 174 corresponding to the position of the second light homogenizing element 160 in the first filter device 170 to generate a second color light (i.e., red light with a better color gamut). The second sub-laser beam L12 of the laser beam L1 from the second beam splitting module 140 passes through the filter 182A of the second filter device 180A and the light transmission region 176 corresponding to the position of the second light homogenizing element 160 in the first filter device 170 and is transmitted to the second light homogenizing element 160. In this way, the composition of the red light can be made purer, thereby improving the red light color gamut. It should be noted that in this embodiment, the second filter device 180A is specifically configured to be located between the second beam splitting module 140 and the first filter device 170. However, in other embodiments, the second filter device 180A can also be disposed between the first filter device 170 and the second light homogenizing element 160. The present invention is not limited thereto.

[0045] Figure 10 is a schematic diagram of a lighting system according to another embodiment of the present invention. Please refer to Figure 10 For convenience of description, Figure 10The light transmission path is not shown. For the light transmission path described below, please refer to Figures 1A to 1D . The illumination system 100G shown in this embodiment is similar to Figure 8 the illumination system 100E shown. The difference between the two is that in this embodiment, the filter 180B includes a first filter 184 and a second filter 186. The first filter 184 is movably disposed between the first beam splitting module 130 and the first light homogenizing element 150. The second filter 186 is movably disposed between the second beam splitting module 140 and the second light homogenizing element 160. The second filter device 180B further includes a switching element (not shown) for switching the first filter 184 to enter and exit the optical path between the first beam splitting module 130 and the first light homogenizing element 150, and for switching the second filter 186 to enter and exit the optical path between the second beam splitting module 140 and the second light homogenizing element 160.

[0046] In summary, the illumination system and the projection device of the embodiments of the present invention have at least one of the following advantages: In the illumination system and the projection device of the present invention, the illumination system includes an excitation light source, a wavelength conversion device, a first beam splitting module, a second beam splitting module, a first light homogenizing element, and a second light homogenizing element. Among them, the laser beam provided by the excitation light source generates a first sub-laser beam and a second sub-laser beam through the optical action of the first beam splitting module and the second beam splitting module, and are respectively transmitted to the first light homogenizing element and the second light homogenizing element, thereby forming the blue light part of the illumination beam. In this way, more blue light can pass through the center of the light homogenizing element, improving the uniformity of blue light in the illumination beam, so as to solve the problem of less blue light distribution in the central angular space distribution of the light homogenizing element under the known optical architecture.

[0047] However, the above are only the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. That is, all simple equivalent changes and modifications made according to the claims of the present invention and the content of the invention still fall within the scope covered by the patent of the present invention. In addition, any embodiment or claim of the present invention does not have to achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract and the title (invention name) are only used to assist in the retrieval of patent documents and do not 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 elements or distinguish different embodiments or scopes, and do not limit the upper or lower limits of the number of elements.

Claims

1. A lighting system for providing a lighting beam, characterized in that, The lighting system includes an excitation light source, a wavelength conversion device, a first beam splitting module, a second beam splitting module, a first light homogenizing element, and a second light homogenizing element, where: The excitation light source is used to provide a laser beam. The wavelength conversion device is arranged on the transmission path of the laser beam and is used to convert the laser beam into an excited beam or reflect the laser beam at different time sequences. The first beam splitting module is arranged between the wavelength conversion device and the second beam splitting module, and is used to allow the laser beam from the excitation light source to pass through, reflect the first sub-laser beam in the laser beam from the wavelength conversion device to the first light homogenizing element, and allow the second sub-laser beam in the laser beam from the wavelength conversion device to pass through. The second beam splitting module is arranged between the excitation light source and the first beam splitting module, and is used to allow the laser beam from the excitation light source to pass through, and reflect the second sub-laser beam from the first beam splitting module to the second light homogenizing element. The first light homogenizing element is arranged on the transmission path of the first sub-laser beam from the first beam splitting module; and The second light homogenizing element is arranged on the transmission path of the second sub-laser beam from the second beam splitting module, and the illumination beam includes the first sub-laser beam, the second sub-laser beam, and the excited beam.

2. The lighting system according to claim 1, wherein The wavelength conversion device includes at least one first wavelength conversion area and at least one reflection area that are arranged in a staggered manner with the rotation axis as the center, where: The at least one first wavelength conversion area is used to convert the laser beam into the excited beam; and The at least one reflection area is used to reflect the laser beam.

3. The lighting system according to claim 2, wherein The wavelength conversion device further includes at least one second wavelength conversion area arranged with the rotation axis as the center, and the at least one second wavelength conversion area is used to convert the laser beam into the excited beam, and the conversion wavelength of the at least one second wavelength conversion area is different from the conversion wavelength of the at least one first wavelength conversion area.

4. The lighting system according to claim 1, characterized in that, The first beam splitting module includes a first beam splitting element and a semi-reflective and semi-transmissive element, where: The first beam splitting element is arranged between the semi-reflective and semi-transmissive element and the wavelength conversion device, and is used to reflect the first part of the excited beam, so that the first part of the excited beam is transmitted towards the first light homogenizing element, and allow the second part of the excited beam and the laser beam to pass through; and The semi-reflective and semi-transmissive element is arranged between the first beam splitting element and the second beam splitting module, and is used to allow the second sub-laser beam in the laser beam and the second part of the excited beam from the first beam splitting element to pass through, and reflect the first sub-laser beam in the laser beam from the first beam splitting element to the first light homogenizing element.

5. The lighting system according to claim 4, wherein The semi-reflective and semi-transmissive element includes a semi-reflective and semi-transmissive area and a fully transmissive area that are arranged adjacent to each other, where: The semi-reflective and semi-transmissive region is located on the transmission path of the laser beam from the first beam splitting element, for allowing the second sub-laser beam in the laser beam from the first beam splitting element and the second part of the excited beam to pass through, and reflecting the first sub-laser beam in the laser beam from the first beam splitting element; and The fully transmissive region is located on the transmission path of the laser beam between the excitation light source and the wavelength conversion device, for allowing the laser beam to pass through.

6. The lighting system according to claim 4, characterized in that, The second beam splitting module includes a second beam splitting element and a reflecting element, wherein: The second beam splitting element is disposed between the reflecting element and the first beam splitting module, for reflecting the second part of the excited beam from the first beam splitting module, so that the second part of the excited beam is transmitted towards the second light homogenizing element, and allowing the second sub-laser beam from the first beam splitting module to pass through; and The reflecting element is disposed between the second beam splitting element and the excitation light source, for reflecting the second sub-laser beam from the first beam splitting module to the second light homogenizing element.

7. The lighting system according to claim 1, characterized in that, The illumination system further includes a first filter device, the first filter device is disposed between the first beam splitting module and the first light homogenizing element, and is disposed between the second beam splitting module and the second light homogenizing element, the first filter device includes two first filter regions, two second filter regions and two light transmissive regions that are symmetrically arranged with the rotation axis as the center and are arranged in an interleaved manner, wherein: The excited beam further includes a first color light and a second color light; The two first filter regions are used for receiving the first part of the excited beam and generating the first color light; The two second filter regions are used for receiving the second part of the excited beam and generating the second color light, the wavelength of the first part is different from the wavelength of the second part; and The two light transmissive regions are used for respectively allowing the first sub-laser beam and the second sub-laser beam to pass through.

8. The lighting system according to claim 7, wherein The first filter device further includes two third filter regions that are symmetrically arranged with the rotation axis as the center, for allowing the excited beam to pass through and generating the first color light and the second color light.

9. The lighting system according to claim 7, wherein, The illumination system further includes a second filter device, wherein: The second filter device includes a filter, which is disposed at least one of between the first beam splitting module and the first light homogenizing element and between the second beam splitting module and the second light homogenizing element; When the second filter device is disposed between the first beam splitting module and the first light homogenizing element, the first part of the excited beam from the first beam splitting module passes through the filter of the second filter device and the first filter region corresponding to the position of the first light homogenizing element in the first filter device to generate the first color light, and the first sub-laser beam of the laser beam from the first beam splitting module passes through the filter of the second filter device and the light transmissive region corresponding to the position of the first light homogenizing element in the first filter device to be transmitted to the first light homogenizing element; and When the second light filtering device is disposed between the second beam splitting module and the second light homogenizing element, the second part of the stimulated light beam from the second beam splitting module passes through the filter of the second light filtering device and the second light filtering region corresponding to the position of the second light homogenizing element in the first light filtering device to generate the second color light, and the second sub-laser beam of the laser beam from the second beam splitting module passes through the filter of the second light filtering device and the light transmitting region corresponding to the position of the second light homogenizing element in the first light filtering device to be transmitted to the second light homogenizing element.

10. The lighting system according to claim 9, characterized in that, The filter includes a first filter and a second filter. The first filter is movably disposed between the first beam splitting module and the first light homogenizing element, and the second filter is movably disposed between the second beam splitting module and the second light homogenizing element. The second light filtering device further includes a switching element for switching the first filter in and out of the optical path between the first beam splitting module and the first light homogenizing element, and switching the second filter in and out of the optical path between the second beam splitting module and the second light homogenizing element.

11. A projection device, characterized in that, The projection device includes an illumination system, at least one light valve, and a projection lens, wherein: The illumination system is used to provide an illumination beam, and the illumination system includes an excitation light source, a wavelength conversion device, a first beam splitting module, a second beam splitting module, a first light homogenizing element, and a second light homogenizing element, wherein: The excitation light source is used to provide a laser beam; The wavelength conversion device is disposed on the transmission path of the laser beam and is used to convert the laser beam into a stimulated light beam or reflect the laser beam at different time sequences; The first beam splitting module is disposed between the wavelength conversion device and the second beam splitting module, and is used to allow the laser beam from the excitation light source to pass through, reflect the first sub-laser beam in the laser beam from the wavelength conversion device to the first light homogenizing element, and allow the second sub-laser beam in the laser beam from the wavelength conversion device to pass through; The second beam splitting module is disposed between the excitation light source and the first beam splitting module, and is used to allow the laser beam from the excitation light source to pass through, and reflect the second sub-laser beam from the first beam splitting module to the second light homogenizing element; The first light homogenizing element is disposed on the transmission path of the first sub-laser beam from the first beam splitting module; and The second light homogenizing element is disposed on the transmission path of the second sub-laser beam from the second beam splitting module, and the illumination beam includes the first sub-laser beam, the second sub-laser beam, and the stimulated light beam; The at least one light valve is disposed on the transmission path of the illumination beam and is used to convert the illumination beam into an image beam; and The projection lens is disposed on the transmission path of the image beam and is used to project the image beam out of the projection device.

12. The projection device according to claim 11, wherein The wavelength conversion device includes at least one first wavelength conversion region and at least one reflection region that are arranged in a staggered manner with a rotation axis as the center, wherein: The at least one first wavelength conversion region is configured to convert the laser beam into the stimulated beam; and The at least one reflection region is configured to reflect the laser beam.

13. The projection device according to claim 12, wherein The wavelength conversion device further includes at least one second wavelength conversion region disposed around the rotation axis, the at least one second wavelength conversion region being configured to convert the laser beam into the stimulated beam, and the conversion wavelength of the at least one second wavelength conversion region being different from the conversion wavelength of the at least one first wavelength conversion region.

14. The projection device according to claim 11, wherein The first beam splitting module includes a first beam splitting element and a semi-reflective semi-transmissive element, wherein:[[]]END]] The first beam splitting element is disposed between the semi-reflective semi-transmissive element and the wavelength conversion device, and is configured to reflect a first portion of the stimulated beam, so that the first portion of the stimulated beam is transmitted toward the first light homogenizing element, and allows a second portion of the stimulated beam and the laser beam to pass through; and The semi-reflective semi-transmissive element is disposed between the first beam splitting element and the second beam splitting module, and is configured to allow the second sub-laser beam in the laser beam from the first beam splitting element and the second portion of the stimulated beam to pass through, and reflect the first sub-laser beam in the laser beam from the first beam splitting element to the first light homogenizing element.

15. The projection device according to claim 14, wherein, The semi-reflective semi-transmissive element includes a semi-reflective semi-transmissive region and a fully transmissive region disposed adjacent to each other, wherein:[[]]END]] The semi-reflective semi-transmissive region is located on the transmission path of the laser beam from the first beam splitting element, and is configured to allow the second sub-laser beam in the laser beam from the first beam splitting element and the second portion of the stimulated beam to pass through, and reflect the first sub-laser beam in the laser beam from the first beam splitting element; and The fully transmissive region is located on the transmission path of the laser beam between the excitation light source and the wavelength conversion device, and is configured to allow the laser beam to pass through.

16. The projection device according to claim 14, wherein The second beam splitting module includes a second beam splitting element and a reflection element, wherein:[[]]END]] The second beam splitting element is disposed between the reflection element and the first beam splitting module, and is configured to reflect the second portion of the stimulated beam from the first beam splitting module, so that the second portion of the stimulated beam is transmitted toward the second light homogenizing element, and allows the second sub-laser beam from the first beam splitting module to pass through; and The reflection element is disposed between the second beam splitting element and the excitation light source, and is configured to reflect the second sub-laser beam from the first beam splitting module to the second light homogenizing element.

17. The projection device according to claim 11, wherein The illumination system further includes a first filter device, the first filter device being disposed between the first beam splitting module and the first light homogenizing element, and being disposed between the second beam splitting module and the second light homogenizing element, the first filter device including two first filter regions, two second filter regions, and two light transmissive regions that are symmetrically disposed around the rotation axis and arranged in an interleaved manner, wherein:[[]]END]] The stimulated beam further includes a first color light and a second color light; The two first filter regions are configured to receive the first portion of the stimulated beam and generate the first color light; The two second filter regions are configured to receive a second portion of the laser beam and generate the second color light, the wavelength of the first portion being different from the wavelength of the second portion; and The two light-transmitting regions are configured to allow the first sub-laser beam and the second sub-laser beam to pass through respectively.

18. The projection device according to claim 17, wherein, The first filter device further includes two third filter regions symmetrically arranged about the rotation axis, configured to allow the excited beam to pass through and generate the first color light and the second color light.

19. The projection device according to claim 17, wherein The illumination system further includes a second filter device, wherein: The second filter device includes a filter, which is configured to be located between the first beam splitting module and the first light homogenizing element and / or between the second beam splitting module and the second light homogenizing element at least; When the second filter device is configured to be located between the first beam splitting module and the first light homogenizing element, the first portion of the excited beam from the first beam splitting module passes through the filter of the second filter device and the first filter region of the first filter device corresponding to the position of the first light homogenizing element to generate the first color light, and the first sub-laser beam of the laser beam from the first beam splitting module passes through the filter of the second filter device and the light-transmitting region of the first filter device corresponding to the position of the first light homogenizing element to be transmitted to the first light homogenizing element; and When the second filter device is configured to be located between the second beam splitting module and the second light homogenizing element, the second portion of the excited beam from the second beam splitting module passes through the filter of the second filter device and the second filter region of the first filter device corresponding to the position of the second light homogenizing element to generate the second color light, and the second sub-laser beam of the laser beam from the second beam splitting module passes through the filter of the second filter device and the light-transmitting region of the first filter device corresponding to the position of the second light homogenizing element to be transmitted to the second light homogenizing element.

20. The projection device according to claim 19, wherein The filter includes a first filter and a second filter. The first filter is movably configured between the first beam splitting module and the first light homogenizing element, and the second filter is movably configured between the second beam splitting module and the second light homogenizing element. The second filter device further includes a switching element configured to switch the first filter in and out of the optical path between the first beam splitting module and the first light homogenizing element, and switch the second filter in and out of the optical path between the second beam splitting module and the second light homogenizing element.

Images