Diffusion Rotation Device and Projection Device

Abstract

A diffusion rotation device is disposed in the propagation path of a light beam. The diffusion rotation device includes a substrate, a rotating shaft, and a driving element. The rotating shaft is connected to the substrate. The driving element is connected to the rotating shaft and drives the rotating shaft to rotate. The substrate includes a first diffusion region and an optical region arranged adjacent to each other. The first diffusion region has a plurality of first diffusion sub-regions, wherein each plurality of first diffusion sub-regions extends circumferentially along the substrate and is concentrically arranged radially along the substrate. When the first diffusion region intersects the propagation path of the light beam, the light beam forms a first spot on the first diffusion region of the substrate. Radially along the substrate, the diffusion degree of the first diffusion sub-region corresponding to the center portion of the first spot is greater than the diffusion degree of the first diffusion sub-region corresponding to the edge portion of the first spot. A projection device is also mentioned. Therefore, the projection device using this diffusion rotation device has good optical efficiency.

Description

Technical Field

[0001] This invention relates to a rotating device and an optical device, and more particularly to a diffusion rotating device and a projection device. Background Technology

[0002] In the architecture of a laser projector, a blue laser beam sequentially illuminates the phosphor area and reflective (or transmissive) area of ​​a phosphor wheel to output yellow and blue light. The projector then uses a filter element to extract the desired color light (green and / or red) from the broadband yellow light. To achieve an ideal energy distribution in the laser spot formed on the phosphor wheel, a spot shaping element can be used to adjust the blue laser spot. However, typical spot shaping elements cannot be individually optimized for different phosphor areas on the phosphor wheel, and the blue laser beam enlarges to match the energy density required by the phosphor area, resulting in reduced blue light efficiency.

[0003] The "Background Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Background Art" paragraph may include some known technologies that are not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not represent that the content or the problems to be solved by one or more embodiments of this invention were known or recognized by those skilled in the art prior to this application. Summary of the Invention

[0004] The present invention provides a diffusion rotation device that enables projection devices using this diffusion rotation device to have good optical efficiency.

[0005] This invention provides a projection device with good optical efficiency.

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

[0007] To achieve one, some, or all of the above objectives, or other objectives, an embodiment of the present invention provides a diffusion rotation device disposed on the transmission path of a light beam. The diffusion rotation device includes a substrate, a rotating shaft, and a driving element. The rotating shaft is connected to the substrate. The driving element is connected to the rotating shaft and is used to drive the rotating shaft to rotate. The substrate includes a first diffusion region and an optical region arranged adjacent to each other. The first diffusion region has a plurality of first diffusion sub-regions, wherein each of the plurality of first diffusion sub-regions extends circumferentially along the substrate and is concentrically arranged radially along the substrate. When the first diffusion region intersects the transmission path of the light beam, the light beam forms a first light spot on the first diffusion region of the substrate, and in the radial direction of the substrate, the diffusion degree of the first diffusion sub-region corresponding to the central portion of the first light spot is greater than the diffusion degree of the first diffusion sub-region corresponding to the edge portion of the first light spot.

[0008] To achieve one or more of the above-mentioned objectives, or other objectives, an embodiment of the present invention provides a projection device, including an illumination system, at least one light valve, and a projection lens. The illumination system provides an illumination beam and includes a first light source, the aforementioned diffusion-rotation device, and a wavelength conversion element. At least one light valve is disposed on the transmission path of the illumination beam to modulate the illumination beam into an image beam. The projection lens is disposed on the transmission path of the image beam. The first light source emits a first beam. The diffusion-rotation device is disposed on the transmission path of the first beam, and a first diffusion region and an optical region are sequentially inserted into the transmission path of the first beam. The wavelength conversion element is disposed on the transmission path of the first beam from the diffusion-rotation device, and the wavelength conversion element includes an adjacently disposed first wavelength conversion region and a light-acting region, wherein the first wavelength conversion region is correspondingly inserted into the transmission path of the first beam from the first diffusion region, and the light-acting region is correspondingly inserted into the transmission path of the first beam from the optical region, and the first wavelength conversion region is used to convert the first beam from the first diffusion region into a first converted beam, and the illumination beam includes the first converted beam.

[0009] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. The driving element of the diffusion rotation device of the present invention drives the rotation of a shaft connected to a substrate. The substrate of the diffusion rotation device includes a first diffusion region and an optical region arranged adjacent to each other. Therefore, the diffusion rotation device can optimize the beam spot separately through different partitions, so that the beam passing through the diffusion rotation device can have different beam spot energy densities at different times. Furthermore, the first diffusion region has multiple first diffusion sub-regions. When the first diffusion region cuts into the beam's transmission path, the beam forms a first beam spot on the first diffusion region of the substrate. In the radial direction of the substrate, the diffusion degree of the first diffusion sub-region corresponding to the center portion of the first beam spot is greater than the diffusion degree of the first diffusion sub-region corresponding to the edge portion of the first beam spot. Therefore, the multiple first diffusion sub-regions can further optimize the energy distribution of the beam spot, preventing the beam energy from being excessively concentrated in the center. In this way, the projection device using this diffusion rotation device can perform separate optimizations corresponding to different partitions of the optical wavelength conversion element. Furthermore, the beam spot energy irradiating the first wavelength conversion region is not excessively concentrated in the center, resulting in better optical conversion efficiency and less risk of burning out the optical wavelength conversion element. Therefore, the projection device of the present invention has good optical efficiency.

[0010] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a projection device according to a first embodiment of the present invention.

[0012] Figure 2A yes Figure 1 A front view schematic diagram of the diffusion rotation device in the diagram.

[0013] Figure 2B yes Figure 2A The diffusion distribution diagram of the first diffusion region in the image.

[0014] Figure 3 yes Figure 1 A front view schematic diagram of the optical wavelength conversion element.

[0015] Figure 4 This is a front view schematic diagram of another diffusion rotation device according to the first embodiment of the present invention.

[0016] Figure 5 Is with Figure 4 A front view schematic diagram of another corresponding optical wavelength conversion element.

[0017] Figure 6 This is a schematic diagram of a projection device according to a second embodiment of the present invention.

[0018] Figure 7 This is a schematic diagram of a projection device according to a third embodiment of the present invention.

[0019] Figure 8 This is a schematic diagram of a projection device according to a fourth embodiment of the present invention. Detailed Implementation

[0020] The foregoing descriptions and other technical contents, features, and effects of this invention will be clearly presented in the following detailed description of preferred embodiments with reference to the accompanying drawings. The directional terms used in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0021] Figure 1 This is a schematic diagram of a projection device according to a first embodiment of the present invention. Please refer to... Figure 1The projection device 200 of this embodiment is used to provide a projection beam PB, and the projection device 200 includes an illumination system 100, at least one light valve 210, and a projection lens 220. The illumination system 100 is used to emit an illumination beam IB. At least one light valve 210 is disposed in the transmission path of the illumination beam IB to modulate the illumination beam IB into an image beam IMB. The projection lens 220 is disposed in the transmission path of the image beam IMB and is used to receive the image beam IMB from the at least one light valve 210 and form the projection beam PB, and project the projection beam PB onto a screen, whiteboard, or wall (not shown) to form an image. Since the illumination beams IB of different colors irradiate at least one light valve 210, the light valve 210 sequentially converts the illumination beams IB of different colors into image beams IMB and transmits them to the projection lens 220. Therefore, the image beams IMB converted by the light valve 210 generate projection beams PB through the projection lens 200, and the image image formed by the projection device 200 can become a color image when the projection beams PB are projected out.

[0022] In this embodiment, the light valve 210 is, for example, a digital micromirror device (DMD) or a liquid-crystal-on-silicon panel (LCOS panel). However, in other embodiments, the light valve 210 may also be a transmissive liquid crystal panel or other spatial light modulator. Furthermore, this embodiment does not limit the number of light valves 210. In this embodiment, the projection lens 220 is, for example, a combination of one or more optical lenses having refractive power. These optical lenses include, for example, non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, plano-concave lenses, etc., or various combinations thereof. This invention does not limit the type or form of the projection lens 220.

[0023] like Figure 1 As shown, the lighting system 100 includes a first light source 110, a diffusion-rotation device 120, and a wavelength conversion element 130. The first light source 110 emits a first light beam L1. The diffusion-rotation device 120 is disposed in the transmission path of the first light beam L1. The wavelength conversion element 130 is disposed in the transmission path of the first light beam L1 from the diffusion-rotation device 120. The diffusion-rotation device 120 is disposed between the first light source 110 and the wavelength conversion element 130.

[0024] In this embodiment, the first light source 110 generally refers to a light source capable of emitting short-wavelength light beams. The peak wavelength of the short-wavelength light beam, for example, falls within the wavelength range of blue light or ultraviolet light, where the peak wavelength is defined as the wavelength corresponding to the point of maximum light intensity. The first light source 110 includes a laser diode (LD), a light-emitting diode (LED), or an array or group of both, and the present invention is not limited thereto. In this embodiment, the first light source 110 is a laser light-emitting element including a laser diode. For example, the first light source 110 may be, for example, a blue laser diode bank, and the first light beam L1 is a blue laser beam, but the present invention is not limited thereto.

[0025] Figure 2A yes Figure 1 A front view schematic diagram of the diffusion rotation device in the diagram. Figure 2B yes Figure 2A The diffusion distribution diagram of the first diffusion region. Please refer to... Figure 2A The diffusion rotation device 120 is a rotatable disk-shaped device, comprising a substrate S1, a rotating shaft RA1, and a driving element DR1. The rotating shaft RA1 is connected to the substrate S1. The driving element DR1 is connected to the rotating shaft RA1 and is used to drive the rotating shaft RA1 to rotate, thereby causing the substrate S1 to rotate. The substrate S1 includes a first diffusion region 122 and an optical region 124 arranged adjacent to each other. The first diffusion region 122 has a plurality of first diffusion sub-regions (e.g., ...). Figure 2A The first diffusion sub-regions 122a to 122e are respectively located in the substrate S1. Each of the first diffusion sub-regions 122a to 122e extends circumferentially along the substrate S1 and is concentrically arranged radially along the substrate S1. The optical region 124 is, for example, a light-transmitting region, which is formed, for example, by glass or other transparent plates. The optical region 124 may also be a cutout region on the substrate S1.

[0026] In this embodiment, when the substrate S1 of the diffusion rotation device 120 rotates, the first diffusion region 122 and the optical region 124 sequentially enter the transmission path of the first light beam L1. When the first diffusion region 122 enters the transmission path of the first light beam L1, the first light beam L1 forms a first light spot SP1 on the first diffusion region 122 of the substrate S1 (the formation range of the first light spot may cover, for example, the first diffusion sub-regions 122a to 122e). In the radial direction of the substrate S1, the diffusion degree of the first diffusion sub-region corresponding to the central portion of the first light spot SP1 (for example, the first diffusion sub-region 122c) is greater than the diffusion degree of the first diffusion sub-regions corresponding to the edge portion of the first light spot SP1 (for example, the first diffusion sub-regions 122a and 122e).

[0027] Generally, the shape of the light spot formed by a semiconductor laser is approximately elliptical, and its light intensity distribution is approximately Gaussian. Because the light intensity per unit area at the center of the light spot formed by a laser beam with an approximately Gaussian intensity distribution is relatively strong, this results in a greater light intensity on subsequent illumination of the first wavelength conversion region 132 of the wavelength conversion element 130 (see...). Figure 3 If the temperature is too high, the conversion efficiency of the first wavelength conversion region 132 will decrease. Therefore, when the diffusion degree of the two opposite first diffusion sub-regions (e.g., first diffusion sub-region 122a and first diffusion sub-region 122e) corresponding to the central part of the first light spot SP1 is less than the diffusion degree of the first diffusion sub-region (e.g., first diffusion sub-region 122c) corresponding to the central part of the first light spot SP1, the energy distribution of the light spot formed by the first beam L1 can be optimized, so that the energy of the first beam L1 passing through the first diffusion region 122 is uniform. Therefore, the light spot energy is not excessively concentrated in the central part, thereby enabling the subsequent optical wavelength conversion element 130 to have better optical conversion efficiency and less likely to burn out the wavelength conversion material on the optical wavelength conversion element 130.

[0028] In detail, the first diffusion sub-regions 122a to 122e in this embodiment may each have different diffusivity. Please refer to [the document for further details]. Figure 2B ,exist Figure 2BIn the diagram, the vertical axis represents the diffusion degree; a larger diffusion degree indicates a greater diffusion capability, allowing the transmitted light beam to have a greater degree of divergence. The horizontal axis represents the radial position relative to the center of the substrate S1; a larger radial position indicates a greater distance from the center of the substrate S1. For example, position a corresponds to the first diffuser sub-region 122a, position b corresponds to the first diffuser sub-region 122b, position c corresponds to the first diffuser sub-region 122c, position d corresponds to the first diffuser sub-region 122d, and position e corresponds to the first diffuser sub-region 122e. Figure 2B As shown, the diffusion degree of multiple first diffusion sub-regions at different radial positions of substrate S1 may be different. The diffusion degree of first diffusion sub-region 122c may be the largest, while the diffusion degree of first diffusion sub-regions 122b and 122d on the two opposite sides of first diffusion sub-region 122c may be the second largest, and the diffusion degree of first diffusion sub-regions 122a and 122e may be the smallest.

[0029] Furthermore, these first diffusion sub-regions may, for example, be provided with flyeye lenses, diffusion particles, diffraction optical elements (DOEs), or other structures that can provide a diffusion effect. When these first diffusion sub-regions are provided with flyeye lenses, the diffusion degree can be adjusted by adjusting the curvature of their microlenses. For example, the curvature of the microlens in the first diffusion sub-region 122c corresponding to the central portion of the first light spot SP1 can be made greater than the curvature of the microlenses in the first diffusion sub-regions 122b and 122d, and the curvature of the microlenses in the first diffusion sub-regions 122b and 122d can be made greater than the curvature of the microlenses in the first diffusion sub-regions 122a and 122e. When these first diffusion sub-regions are provided with diffusion particles, the diffusion degree can be adjusted by adjusting their particle size (haze). For example, the particle size (haze) of the first diffusion sub-region 122c corresponding to the center part of the first light spot SP1 can be made larger than the particle size (haze) of the first diffusion sub-regions 122b and 122d, and the particle size (haze) of the first diffusion sub-regions 122b and 122d can be made larger than the particle size (haze) of the first diffusion sub-regions 122a and 122e. When these first diffusion sub-regions are equipped with diffraction optical elements, the diffusion degree can be adjusted by adjusting their grating spacing. For example, the grating spacing of the first diffusion sub-region 122c corresponding to the center portion of the first light spot SP1 can be made smaller than the grating spacing of the first diffusion sub-regions 122b and 122d, and the grating spacing of the first diffusion sub-regions 122b and 122d can be made smaller than the grating spacing of the first diffusion sub-regions 122a and 122e. This embodiment uses five first diffusion sub-regions as an example; however, the present invention does not limit the number of first diffusion sub-regions.

[0030] Furthermore, in this embodiment, each of the multiple first diffusion sub-regions (first diffusion sub-regions 122a to 122e) has a discrete diffusion degree, that is, each first diffusion sub-region has a single diffusion degree, and the diffusion degrees of two adjacent first diffusion sub-regions are different and discontinuous (e.g., Figure 2B The diffusion curve is stepped. However, in other embodiments, the diffusion of two adjacent first diffusion sub-regions may also be continuously and gradually changing (e.g., the diffusion curve is smoothly curved), and the present invention is not limited thereto.

[0031] In this embodiment, when the rotating diffusion device 120 rotates about the central axis RA1, the first diffusion region 122 and the optical region 124 sequentially enter the transmission path of the first beam L1. Since the first diffusion region 122 can diffuse the first beam L1, and the optical region 124, for example, as a light-penetrating region, allows the first beam L1 to pass directly without diffusion, the divergence angle of the first beam L1 passing through the first diffusion region 122 is different from (greater than) the divergence angle of the first beam L1 passing through the optical region 124, and the spot size of the first beam L1 passing through the first diffusion region 122 is different from (greater than) the spot size of the first beam L1 passing through the optical region 124. Therefore, the diffusion rotation device 120 can adjust and optimize the spot size of the first beam L1 separately through different partitions, so that the first beam L1 passing through the diffusion rotation device 120 can have different spot energy densities at different times.

[0032] It is worth mentioning that, since the first beam L1 passing through the optical region 124 can serve as the blue light portion of the illumination beam IB, and the optical region 124, for example, as a light-transmitting region, allows the first beam L1 to pass directly without diffusion, the first beam L1 passing through the optical region 124 can maintain its original collimated beam and high energy, thereby maintaining the efficiency of blue light. Furthermore, the diffusion rotation device 120 of this embodiment can be used to provide diffusion to adjust the size, shape, and energy distribution of the light spot, but does not have a color-filtering function.

[0033] Figure 3 yes Figure 1 A front view schematic diagram of the optical wavelength conversion element. Please refer to... Figure 3The wavelength conversion element 130 is a rotatable disk-shaped device, comprising a substrate S2, a rotating shaft RA2, and a driving element DR2. The rotating shaft RA2 is connected to the substrate S2. The driving element DR2 is connected to the rotating shaft RA2 and is used to drive the rotating shaft RA2 to rotate, thereby causing the substrate S2 to rotate. The substrate S2 includes a first wavelength conversion region 132 and a light-acting region 134 arranged adjacent to each other, and the substrate S2 is, for example, a reflective substrate or a transparent substrate coated with a reflective layer. A wavelength conversion material CM1 is disposed in the first wavelength conversion region 132, and the wavelength conversion material CM1 is, for example, a yellow phosphor. When a blue laser beam (first beam L1) is incident on the first wavelength conversion region 132, the yellow phosphor can be excited by the blue laser beam (first beam L1) to emit a yellow beam (first conversion beam CB1). The light-acting region 134 is, for example, a reflective region.

[0034] Please refer to the following at the same time Figure 2A and Figure 3 The angle range covered by the first diffusion region 122 of the diffusion rotation device 120 relative to the central axis (rotation axis RA1) of the diffusion rotation device 122 is the same as the angle range covered by the first wavelength conversion region 132 of the optical wavelength conversion element 130 relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130, and the angle range covered by the optical region 124 of the diffusion rotation device 120 relative to the central axis (rotation axis RA1) of the diffusion rotation device 120 is the same as the angle range covered by the light action region 134 of the optical wavelength conversion element 130 relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130.

[0035] In this embodiment, when the substrate S2 of the optical wavelength conversion element 130 rotates about the pivot RA2, the first wavelength conversion region 132 and the light action region 134 (reflection region) sequentially enter the transmission path of the first light beam L1. Specifically, the first wavelength conversion region 132 enters the transmission path of the first light beam L1 from the first diffusion region 122 of the diffusion rotation device 120, and the light action region 134 (reflection region) enters the transmission path of the first light beam L1 from the optical region 124 (light transmission region) of the diffusion rotation device 120. When the first wavelength conversion region 132 enters the transmission path of the first light beam L1 from the first diffusion region 122 of the diffusion rotation device 120, the first wavelength conversion region 132 converts the first light beam L1 from the first diffusion region 122 into a first converted light beam CB1 with a wavelength different from the first light beam L1, and the first converted light beam CB1 is reflected by the substrate S2. When the light-acting area 134 (reflection area) cuts into the transmission path of the first beam L1 from the optical area 124 (light-penetrating area) of the diffusion and rotation device 120, the light-acting area 134 (reflection area) reflects the first beam L1 from the optical area 124 (light-penetrating area).

[0036] In this embodiment, the optical wavelength conversion element 130 further includes at least one filter region (e.g., a filter area). Figure 3 The three adjacent filter regions (including red light filter region FR-R, green light filter region FR-G, and blue light filter region FR-B) are used to filter out light beams outside a specific wavelength range while allowing light beams within that specific wavelength range to pass through, thereby improving the color purity of the light. The radial distance of at least one filter region (red light filter region FR-R, green light filter region FR-G, and blue light filter region FR-B) relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130 is different from the radial distance of the first wavelength conversion region 132 and the light action region 134 relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130. Here, in this embodiment, the radial distance of at least one filter region (red light filter region FR-R, green light filter region FR-G, and blue light filter region FR-B) relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130 is less than the radial distance of the first wavelength conversion region 132 and the light action region 134 relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130. That is, at least one filter region (red light filter region FR-R, green light filter region FR-G, and blue light filter region FR-B) is close to the inner circle of the substrate S2, while the first wavelength conversion region 132 and the light action region 134 are close to the outer circle of the substrate S2. That is, the first wavelength conversion region 132 and the light action region 134 located on the outer circle surround the red light filter region FR-R, the green light filter region FR-G, and the blue light filter region FR-B located on the inner circle. Furthermore, if the substrate S2 is, for example, a reflective substrate, then the first wavelength conversion region 132 and the light-acting region 13 located in the outer ring are disposed on the substrate S2, while the red light filtering region FR-R, the green light filtering region FR-G, and the blue light filtering region FR-B located in the inner ring are, for example, red filters, green filters, and blue filters connected to the substrate. If it is a light-transmitting substrate coated with a reflective layer, then the first wavelength conversion region 132 and the light-acting region 13 located in the outer ring are disposed on the reflective layer of the substrate S2, while the red light filtering region FR-R, the green light filtering region FR-G, and the blue light filtering region FR-B located in the inner ring are, for example, coated with corresponding filter films on the light-transmitting substrate S2. However, in other embodiments, the radial distance of at least one filter region (red light filter region FR-R, green light filter region FR-G, and blue light filter region FR-B) relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130 may be greater than the radial distance of the first wavelength conversion region 132 and the light-acting region 134 relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130. That is, at least one filter region (red light filter region FR-R, green light filter region FR-G, and blue light filter region FR-B) is closer to the outer ring of the substrate S2, while the first wavelength conversion region 132 and the light-acting region 134 are closer to the inner ring of the substrate S2.

[0037] In this embodiment, the filter element is integrated into the optical wavelength conversion element 130, which helps to reduce size and cost.

[0038] Please refer to this again. Figure 1 The lighting system 100 of this embodiment further includes a light combining module 140 and a reflector 150. The light combining module 140 is located between the first light source 110 and the wavelength conversion element 130, and is situated on the transmission path of the first beam L1 from the first light source 110 and the first beam L1 and the first converted beam CB1 from the wavelength conversion element 130. Specifically, the light combining module 140 may include a first color-splitting unit 142 and a second color-splitting unit 144. The first color-splitting unit 142 is located on the transmission path of the first beam L1 from the first light source 110 and the first beam L1 and the first converted beam CB1 from the wavelength conversion element 130. The second color-splitting unit 144 is located on the transmission path of the first beam L1 from the wavelength conversion element 130. The first color-splitting unit 142 and the second color-splitting unit 144 may be, for example, dichroic mirrors (DM) or dichroic prisms, and can provide different optical effects for beams of different colors. For example, in this embodiment, the first color-splitting unit 142 allows blue light beams to pass through while reflecting light beams of other colors (such as red, green, yellow, etc.). The second color-splitting unit 144 can, for example, reflect blue light beams. In some embodiments, a reflector can be used instead of the second color-splitting unit 144.

[0039] In this embodiment, the first color separation unit 142 can be designed to allow the first light beam L1 to pass through and reflect the first converted light beam CB1. The second color separation unit 144 can be designed to reflect the first light beam L1. Therefore, the first color separation unit 142 can transmit the first light beam L1 from the first light source 110 to the optical wavelength conversion element 130, and transmit the first light beam L1 and the first converted light beam CB1 from the optical wavelength conversion element 130 to the second color separation unit 144 and the reflector 150, respectively. After the second color separation unit 144 reflects the first light beam L1 back to the first color separation unit 142, the first color separation unit 142 can transmit the first light beam L1 from the second color separation unit 144 to the reflector 150.

[0040] Next, the reflector 150 transmits the first converted beam CB1 and the first beam L1 from the beam combining module 140 to the optical wavelength conversion element 130 at different times. The red light filter region FR-R and the green light filter region FR-G of the optical wavelength conversion element 130 are respectively inserted into the transmission path of the first converted beam CB1 from the first wavelength conversion region 132, and the blue light filter region FR-B of the optical wavelength conversion element 130 is respectively inserted into the transmission path of the first beam L1 from the light action region 134 (reflection region). When the first converted beam CB1 (e.g., a yellow beam) is transmitted to the red light filter region FR-R or the green light filter region FR-G, the first converted beam CB1 is filtered to form a red light beam or a green light beam. When the first beam L1 (a blue laser beam) is transmitted to the blue light filter region FR-B, the first beam L1 passes through and, for example, becomes a blue light beam.

[0041] Through the arrangement of the light combining module 140 and the reflector 150, the first converted light beam CB1 and the first light beam L1 from the first side of the light wavelength conversion element 130 can be transmitted to the second side of the light wavelength conversion element 130, where the first side and the second side are opposite to each other, that is, the first side and the second side are opposite sides of the rotation axis RA2. Therefore, the azimuth angle range covered by the blue light filter area FR-B relative to the central axis (rotation axis RA2) will be rotated by 180 degrees relative to the azimuth angle range covered by the light action area 134 (reflection area) relative to the central axis (rotation axis RA2). That is to say, the azimuth angle of the clockwise boundary A1 of the blue light filter area FR-B and the azimuth angle of the clockwise boundary B1 of the light action area 134 (reflection area) differ by 180 degrees, and the azimuth angle of the counterclockwise boundary A2 of the blue light filter area FR-B and the azimuth angle of the counterclockwise boundary B2 of the light action area 134 (reflection area) differ by 180 degrees. Similarly, the azimuth angle ranges covered by the red light filter region FR-R and the green light filter region FR-G relative to the central axis (rotation axis RA2) are also rotated by 180 degrees relative to the azimuth angle range covered by the first wavelength conversion region 132 relative to the central axis (rotation axis RA2). That is to say, the azimuth angle of the clockwise boundary C1 of the red light filter region FR-R and the green light filter region FR-G differs from the azimuth angle of the clockwise boundary D1 of the first wavelength conversion region 132 by 180 degrees, and the azimuth angle of the counterclockwise boundary C2 of the red light filter region FR-R and the green light filter region FR-G differs from the azimuth angle of the counterclockwise boundary D2 of the first wavelength conversion region 132 by 180 degrees.

[0042] Please refer to this again. Figure 1 The lighting system 100 in this embodiment also includes a light-collecting element 160 and a plurality of lenses (e.g., are...). Figure 1Lenses O1 to O6 are used in the illumination system 100. A light-collecting element 160 is disposed on the transmission path of a first converted beam CB1 and a first beam L1 from at least one filter region, for homogenizing the first converted beam CB1 and the first beam L1 to form an illumination beam IB. In this embodiment, the illumination beam IB includes the first converted beam CB1 and the first beam L1. In this embodiment, the light-collecting element 160 is, for example, an integration rod, but is not limited thereto. Multiple lenses (lenses O1 to O6) are used to adjust the beam path within the illumination system 100.

[0043] It must be noted that the following embodiments use some content from the foregoing embodiments, omitting the description of the same technical content. For the same component names, please refer to the foregoing embodiments. The following embodiments will not repeat the description.

[0044] Figure 4 This is a front view schematic diagram of another diffusion rotation device according to the first embodiment of the present invention. Figure 5 Is with Figure 4 A front view schematic diagram of another corresponding optical wavelength conversion element. Figure 4 and Figure 5 The diffusion rotation device 120a and the optical wavelength conversion element 130a in the middle Figure 2A and Figure 3 The diffusion rotation device 120 is similar to the optical wavelength conversion element 130, the main difference being that... Figure 4 The diffusion rotation device 120a also includes a second diffusion region 126, and Figure 5 The optical wavelength conversion element 130a also includes a second wavelength conversion region 136.

[0045] Please refer to the following: Figure 4 The substrate S1 of the diffusion rotation device 120a includes a first diffusion region 122, an optical region 124, and a second diffusion region 126 arranged adjacent to each other. The second diffusion region 126 has a plurality of second diffusion sub-regions (e.g., Figure 4 The second diffusion sub-regions 126a to 126e are respectively, wherein each of the second diffusion sub-regions (second diffusion sub-regions 126a to 126e) extends circumferentially along the substrate S1 of the diffusion rotation device 120a and the second diffusion sub-regions (second diffusion sub-regions 126a to 126e) are arranged concentrically along the radial direction of the substrate S1.

[0046] In this embodiment, when the substrate S1 of the diffusion rotation device 120a rotates about the rotation axis RA1, the first diffusion region 122, the optical region 124, and the second diffusion region 126 sequentially enter the transmission path of the first light beam L1. When the first diffusion region 122 of the diffusion rotation device 120a enters the transmission path of the first light beam L1, the first light beam L1 forms the aforementioned first light spot SP1 on the first diffusion region 122 of the substrate S1. When the second diffusion region 126 of the diffusion rotation device 120a cuts into the transmission path of the first light beam L1, the first light beam L1 forms a second light spot on the second diffusion region 126 of the substrate S1 (the formation range of the second light spot may cover at least two of the second diffusion sub-regions 126a to 126e). In the radial direction of the substrate S1, the diffusion degree of the second diffusion sub-region corresponding to the center portion of the second light spot (e.g., the second diffusion sub-region 126c) is greater than the diffusion degree of the second diffusion sub-region corresponding to the edge portion of the second light spot (e.g., the second diffusion sub-region 126a and the second diffusion sub-region 126e).

[0047] The second diffusion region 126 in this embodiment is similar to the first diffusion region 122, and the relevant description can be found in the foregoing embodiments, so it will not be repeated here. The main difference between the first diffusion region 122 and the second diffusion region 126 is that the first diffusion region 122 and the second diffusion region 126 are different diffusion elements, wherein the overall diffusion degree of the first diffusion region 122 is different from the overall diffusion degree of the second diffusion region 126. Therefore, the divergence angle of the first beam L1 passing through the first diffusion region 122 is different from the divergence angle of the first beam L1 passing through the second diffusion region 126, and the spot size of the first beam L1 passing through the first diffusion region 122 is different from the spot size of the first beam L1 passing through the second diffusion region 126. Therefore, the diffusion rotation device 120a can adjust and optimize the spot size of the first beam L1 separately through different partitions, so that the first beam L1 passing through the diffusion rotation device 120a can have different spot energy densities at different times.

[0048] Furthermore, in this embodiment, the first diffusion region 122 has multiple first diffusion sub-regions (first diffusion sub-regions 122a to 122e), while the second diffusion region 126 has multiple second diffusion sub-regions (second diffusion sub-regions 126a to 126e). However, in other embodiments, the first diffusion region 122 may have multiple first diffusion sub-regions (first diffusion sub-regions 122a to 122e), while the second diffusion region 126 may have only a single diffusion degree and not multiple second diffusion sub-regions. Alternatively, the second diffusion region 126 may have multiple first diffusion sub-regions (second diffusion sub-regions 126a to 126e), while the first diffusion region 122 may have only a single diffusion degree and not multiple first diffusion sub-regions.

[0049] Please refer to the following: Figure 5 The substrate S2 of the optical wavelength conversion element 130a includes a first wavelength conversion region 132, an optical interaction region 134, and a second wavelength conversion region 136 arranged adjacent to each other. A wavelength conversion material CM1 is disposed in the first wavelength conversion region 132, and a wavelength conversion material CM2 is disposed in the second wavelength conversion region 136. The wavelength conversion material CM1 is different from the wavelength conversion material CM2. The wavelength conversion material CM1 is, for example, a yellow phosphor or a red phosphor. When a blue laser beam (first beam L1) is incident on the wavelength conversion material CM1 in the first wavelength conversion region 132, the yellow or red phosphor can be excited by the blue laser beam (first beam L1) to emit a yellow or red beam (first conversion beam). The wavelength conversion material CM2 is, for example, a green phosphor. When a blue laser beam (first beam L1) is incident on the wavelength conversion material CM2 in the second wavelength conversion region 136, the green phosphor can be excited by the blue laser beam (first beam L1) to emit a green beam (second conversion beam).

[0050] Please refer to the following at the same time Figure 4 and Figure 5 The angle range covered by the first diffusion region 122 of the diffusion rotation device 120a relative to the central axis (rotation axis RA1) of the diffusion rotation device 120a is the same as the angle range covered by the first wavelength conversion region 132 of the optical wavelength conversion element 130a relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130a. The angle range covered by the optical region 124 of the diffusion rotation device 120a relative to the central axis (rotation axis RA1) of the diffusion rotation device 120a is the same as the angle range covered by the light action region 134 of the optical wavelength conversion element 130a relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130a. The angle range covered by the second diffusion region 126 of the diffusion rotation device 120a relative to the central axis (rotation axis RA1) of the diffusion rotation device 120a is the same as the angle range covered by the second wavelength conversion region 136 of the optical wavelength conversion element 130a relative to the central axis (rotation axis RA2) of the optical wavelength conversion element 130a.

[0051] In this embodiment, when the substrate S2 of the optical wavelength conversion element 130a rotates about the rotation axis RA2, the first wavelength conversion region 132, the light action region 134 (reflection region), and the second wavelength conversion region 136 sequentially enter the transmission path of the first light beam L1 from the first light source 110. The first wavelength conversion region 132 enters the transmission path of the first light beam L1 from the first diffusion region 122 of the diffusion rotation device 120a, the light action region 134 (reflection region) enters the transmission path of the first light beam L1 from the optical region 124 (light transmission region) of the diffusion rotation device 120a, and the second wavelength conversion region 136 enters the transmission path of the first light beam L1 from the second diffusion region 126 of the diffusion rotation device 120a. When the first wavelength conversion region 132 enters the transmission path of the first beam L1 from the first diffusion region 122, the first wavelength conversion region 132 converts the first beam L1 from the first diffusion region 122 into a first converted beam CB1 with a wavelength different from the first beam L1, and the first converted beam CB1 is then reflected by the substrate S2. When the light-acting region 134 (reflection region) enters the transmission path of the first beam L1 from the optical region 124 (light-transmitting region), the light-acting region 134 (reflection region) reflects the first beam L1 from the optical region 124 (light-transmitting region). When the second wavelength conversion region 136 enters the transmission path of the first beam L1 from the second diffusion region 126, the second wavelength conversion region 136 converts the first beam L1 from the second diffusion region 126 into a second converted beam CB2 with a wavelength different from the first beam L1, and the second converted beam CB2 is then reflected by the substrate S2.

[0052] Since wavelength conversion materials CM1 and CM2 are different materials, they may have different heat resistances. For example, the heat resistance of red phosphor is lower than that of yellow or green phosphor. Therefore, the spot size of the first beam L1 can be adjusted according to the heat resistance of different wavelength conversion materials to improve the conversion efficiency of each. In this embodiment, when the wavelength conversion material CM1 is red phosphor, the heat resistance of CM1 is, for example, lower than that of CM2. Therefore, the overall diffusion degree of the first diffusion region 122 corresponding to the first wavelength conversion region 132 can be greater than the overall diffusion degree of the second diffusion region 126 corresponding to the second wavelength conversion region 136. Therefore, the divergence angle of the first beam L1 passing through the first diffusion region 122 can be greater than the divergence angle of the first beam L1 passing through the second diffusion region 126, and the spot size of the first beam L1 passing through the first diffusion region 122 can be greater than the spot size of the first beam L1 passing through the second diffusion region 126.

[0053] In other embodiments, the optical wavelength conversion element may also have other numbers of wavelength conversion regions, and therefore the diffusion rotation device may also have a corresponding number of diffusion regions to be individually optimized for different wavelength conversion regions.

[0054] It should be noted here that when Figure 1 The optical wavelength conversion element 130 is adopted Figure 3 When the wavelength conversion element 130 is used, the lighting system does not have a second converted beam CB2. Figure 1 The optical wavelength conversion element 130 is adopted Figure 5 When the wavelength conversion element 130a is used, the lighting system can have a second converted beam CB2, and the second converted beam CB2 has a substantially the same optical path as the first converted beam CB1. Therefore, in Figure 1 In the diagram, the designation of the second conversion beam CB2 is indicated in parentheses, and the second conversion beam CB2 and the first conversion beam CB1 are represented by the same optical path.

[0055] Figure 6 This is a schematic diagram of a projection device according to a second embodiment of the present invention. Please refer to... Figure 6 The projection device 200a in this embodiment and Figure 1 Similar to the projection device 200, the main difference is that the illumination system 100a of the projection device 200a further includes a second light source 170. The second light source 170 emits a second light beam L2, and the wavelength of the second light beam L2 is different from either the first conversion beam CB1 or the second conversion beam CB2. In this embodiment, the second light source 170 is similar to the first light source 110, and the second light beam L2 can be used as the blue light portion of the illumination beam IB, while the first light beam L1 can be used only as the excitation beam for exciting the wavelength conversion material. Therefore, the optical wavelength conversion element 130b in this embodiment can be compared with... Figure 5 Similar to the optical wavelength conversion element 130a, but it does not need to be equipped with the same... Figure 5 The light-acting region 134 in the embodiment, and the diffusion rotation device 120b in this embodiment can be connected with... Figure 4 The diffusion rotation device 120a is similar, but it may not be required to have the same features as the diffusion rotation device 120a. Figure 4 The optical region 124 is included. Furthermore, the light combining module 140a of this embodiment may not include the second beam splitter 144.

[0056] In this embodiment, the first light beam L1 emitted by the first light source 110 has a first wavelength, and the second light beam L2 emitted by the second light source 170 has a second wavelength. The first wavelength may be different from the second wavelength. For example, the first wavelength may be 455 nanometers, and the second wavelength may be 465 nanometers. However, in other embodiments, the first wavelength may be the same as the second wavelength, and the present invention is not limited thereto.

[0057] In this embodiment, the first color-splitting unit 142 (light-combining module 140a) can be designed to allow the first light beam L1 and the second light beam L2 to pass through and reflect the first converted light beam CB1 and the second converted light beam CB2. Therefore, the first color-splitting unit 142 can transmit the first light beam L1 from the first light source 110 to the light wavelength conversion element 130b, and transmit the first converted light beam CB1 and the second converted light beam CB2 from the light wavelength conversion element 130b, together with the second light beam L2 from the second light source 170, to the reflector 150. Then, the reflector 150 transmits the first converted light beam CB1, the second converted light beam CB2, and the second light beam L2 from the light-combining module 140a to at least one filter area (red light filter area FR-R, green light filter area FR-G, and blue light filter area FR-B) and the light-collecting element 160 of the light wavelength conversion element 130b at different times to form the illumination beam IB, that is, the illumination beam IB in this embodiment includes the first converted light beam CB1, the second converted light beam CB2, and the second light beam L2.

[0058] Figure 7 This is a schematic diagram of a projection device according to a third embodiment of the present invention. Please refer to... Figure 7 The projection device 200b in this embodiment and Figure 1 Similar to the projection device 200 in the previous embodiment, the main difference is that the light-acting area 134 of the light wavelength conversion element 130c of the projection device 200b is a light-transmitting area to allow the first beam L1 from the light-transmitting area 124 to pass through, and the light-combining module 140a of this embodiment may not include the second beam-splitting element 144. In addition, the lighting system 100b of this embodiment also includes a filter element 190 (e.g., a filter wheel) disposed between the light-combining module 140a and the light-collecting element 160 to improve the color purity of the light, so the light wavelength conversion element 130c of this embodiment may not have a filter area.

[0059] In this embodiment, the lighting system 100b further includes a light transmission module 180 for transmitting the first beam L1 through the light-transmitting area 134 (light-transmitting area) to the returning light module 140a. The light transmission module 180 is, for example, a plurality of reflectors 182. In addition, a plurality of lenses (lenses O1 to lenses O9) are used to adjust the beam path inside the lighting system 100b.

[0060] Figure 8 This is a schematic diagram of a projection device according to a fourth embodiment of the present invention. Please refer to... Figure 8 The projection device 200c in this embodiment and Figure 7 The projection device 200b is similar to the projection device 200b described above, except that the projection device 200b also includes a second light source 170. A description of the second light source 170 can be found in the aforementioned second embodiment, and will not be repeated here.

[0061] Furthermore, the optical wavelength conversion element 130d in this embodiment may not be provided as shown. Figure 5 In the light-acting region 134, the diffusion rotation device 120b in this embodiment may not be provided as in the example. Figure 4 The optical zone 124 in the projection device 100c does not have such Figure 7 The optical transmission module 180.

[0062] In this embodiment, the first color-splitting unit 142 (light-combining module 140a) can be designed to allow the first beam L1 and the second beam L2 to pass through and reflect the first converted beam CB1 and the second converted beam CB2. Therefore, the first color-splitting unit 142 can transmit the first beam L1 from the first light source 110 to the light wavelength conversion element 130d, and transmit the first converted beam CB1 and the second converted beam CB2 from the light wavelength conversion element 130d, together with the second converted beam L2 from the second light source 170, to the filter element 190 and the light-collecting element 160 to form the illumination beam IB.

[0063] In summary, the embodiments of the present invention have at least one of the following advantages or effects. The driving element of the diffusion rotation device of the present invention drives the rotation of a shaft connected to a substrate. The substrate of the diffusion rotation device includes a first diffusion region and an optical region arranged adjacent to each other. Therefore, the diffusion rotation device can optimize the beam spot separately through different partitions, allowing the beam passing through the diffusion rotation device to have different beam spot energy densities at different times. Furthermore, the first diffusion region has multiple first diffusion sub-regions. When the first diffusion region cuts into the beam's propagation path, the beam forms a first beam spot on the first diffusion region of the substrate. In the radial direction of the substrate, the diffusion degree of the first diffusion sub-region corresponding to the center portion of the first beam spot is greater than the diffusion degree of the first diffusion sub-region corresponding to the edge portion of the first beam spot. Therefore, the multiple first diffusion sub-regions can further adjust and optimize the energy distribution of the beam spot, preventing excessive concentration of beam spot energy in the center. In this way, the projection device using this diffusion rotation device can perform separate optimizations corresponding to different partitions of the optical wavelength conversion element. Furthermore, the light beam energy illuminating the first wavelength conversion region is not excessively concentrated in the central part, resulting in better light conversion efficiency and less risk of burning out the wavelength conversion element. Therefore, the projection device of the present invention has good optical efficiency.

[0064] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

[0065] Explanation of reference numerals in the attached figures:

[0066] 100, 100a, 100b, 100c: Lighting systems

[0067] 110: First Light Source

[0068] 120, 120a, 120b: Diffusion Rotation Device

[0069] 122: First diffusion zone

[0070] 122a, 122b, 122c, 122d, 122e: First diffusion sub-region

[0071] 124: Optical area

[0072] 126: Second diffusion zone

[0073] 126a, 126b, 126c, 126d, 126e: Second diffusion subregion

[0074] 130, 130a, 130b, 130c, 130d: Optical wavelength conversion elements

[0075] 132: First wavelength conversion region

[0076] 134: Light-acting region

[0077] 136: Second wavelength conversion region

[0078] 140, 140a: Photosynthetic module

[0079] 142: First color separation unit

[0080] 144: Second color separation unit

[0081] 150: Reflector

[0082] 160: Light collecting element

[0083] 170: Second light source

[0084] 180: Optical transmission module

[0085] 182: Reflector

[0086] 190: Filter element

[0087] 200, 200a, 200b, 200c: Projection devices

[0088] 210: Light valve

[0089] 220: Projection lens

[0090] a, b, c, d, e: Positions

[0091] A1, A2, B1, B2, C1, C2, D1, D2: Boundaries

[0092] CM1, CM2: Wavelength conversion materials

[0093] CB1: First conversion beam

[0094] CB2: Second conversion beam

[0095] DR1, DR2: Driving elements

[0096] FR-R: Red light filter region

[0097] FR-G: Green light filtering area

[0098] FR-B: Blue light filter area

[0099] O1, O2, O3, O4, O5, O6, O7, O8, O9: Lenses

[0100] IB: Illumination Beam

[0101] IMB: Image Beam

[0102] L1: First beam

[0103] L2: Second beam

[0104] PB: Projected beam

[0105] RA1, RA2: Shaft

[0106] S1, S2: substrate

[0107] SP1: First light spot.

Claims

1. A diffusion-rotation device, disposed in the transmission path of a light beam, for transmitting the light beam to an optical wavelength conversion element, characterized in that, The optical wavelength conversion element includes a first wavelength conversion region and a second wavelength conversion region arranged adjacent to each other. The first wavelength conversion region is provided with a first wavelength conversion material, and the second wavelength conversion region is provided with a second wavelength conversion material. The first wavelength conversion material is a red or yellow phosphor, and the second wavelength conversion material is a green phosphor. The heat resistance of the first wavelength conversion material is less than that of the second wavelength conversion material. The diffusion rotation device includes a substrate, a rotating shaft, and a driving element, wherein: The rotating shaft is connected to the substrate; The driving element is connected to the rotating shaft and is used to drive the rotating shaft to rotate; and The substrate includes a first diffusion region and a second diffusion region arranged adjacent to each other. When the diffusion rotation device rotates, the first diffusion region and the second diffusion region sequentially enter the transmission path of the light beam. The first diffusion region corresponds to the first wavelength conversion region of the optical wavelength conversion element, and the second diffusion region corresponds to the second wavelength conversion region of the optical wavelength conversion element; wherein: The first diffusion region has a plurality of first diffusion sub-regions, each of which extends circumferentially along the substrate and is concentrically arranged radially along the substrate. When the first diffusion region intersects the propagation path of the light beam, the light beam forms a first spot on the first diffusion region of the substrate. Furthermore, in the radial direction of the substrate, the diffusion degree of the first diffusion sub-region corresponding to the center portion of the first spot is greater than the diffusion degree of the first diffusion sub-region corresponding to the edge portion of the first spot. The second diffusion region has a plurality of second diffusion sub-regions, each of which extends circumferentially along the substrate and is concentrically arranged radially along the substrate. When the second diffusion region intersects the propagation path of the light beam, the light beam forms a second spot on the second diffusion region of the substrate. Furthermore, radially along the substrate, the diffusion degree of the second diffusion sub-region corresponding to the center portion of the second spot is greater than the diffusion degree of the second diffusion sub-region corresponding to the edge portion of the second spot. The overall diffusion degree of the first diffusion region is greater than that of the second diffusion region.

2. The diffusion rotation device according to claim 1, characterized in that, In the radial direction of the substrate, the diffusion degree of the two opposite first diffusion sub-regions corresponding to the central portion of the first light spot is less than the diffusion degree of the first diffusion sub-region corresponding to the central portion of the first light spot, so as to homogenize the energy of the light beam passing through the plurality of first diffusion sub-regions.

3. The diffusion rotation device according to claim 1, characterized in that, The divergence angle of the light beam passing through the first diffusion region is greater than that of the light beam passing through the second diffusion region.

4. The diffusion rotation device according to claim 1, characterized in that, The size of the light spot passing through the first diffusion region is larger than the size of the light spot passing through the second diffusion region.

5. The diffusion rotation device according to claim 1, characterized in that, The first diffusion region and the second diffusion region are different diffusion elements.

6. The diffusion rotation device according to claim 1, characterized in that, The substrate also includes a light-transmitting region.

7. A projection device, characterized in that, The projection device includes an illumination system, at least one light valve, and a projection lens, wherein: The lighting system is used to provide an illumination beam, and the lighting system includes a first light source, a diffusion and rotation device, and a light wavelength conversion element, wherein: The first light source is used to emit the first beam of light; The diffusion-rotation device is disposed on the transmission path of the first beam, and the diffusion-rotation device includes a first diffusion region and a second diffusion region arranged adjacent to each other, the first diffusion region and the second diffusion region sequentially cutting into the transmission path of the first beam. The first diffusion region has a plurality of first diffusion sub-regions, each of which extends circumferentially along the diffusion rotation device and is concentrically arranged radially along the diffusion rotation device. When the first diffusion region intersects the transmission path of the first beam, the first beam forms a first spot on the first diffusion region. Furthermore, in the radial direction of the diffusion rotation device, the diffusion degree of the first diffusion sub-region corresponding to the center portion of the first spot is greater than the diffusion degree of the first diffusion sub-region corresponding to the edge portion of the first spot. The second diffusion region has a plurality of second diffusion sub-regions, each of which... The sub-regions extend circumferentially along the diffusion rotation device, and the plurality of second diffusion sub-regions are concentrically arranged radially along the diffusion rotation device. When the second diffusion region intersects the transmission path of the first beam, the first beam forms a second spot on the second diffusion region of the diffusion rotation device. Furthermore, radially along the diffusion rotation device, the diffusion degree of the second diffusion sub-region corresponding to the center portion of the second spot is greater than the diffusion degree of the second diffusion sub-region corresponding to the edge portion of the second spot. The overall diffusion degree of the first diffusion region is greater than the overall diffusion degree of the second diffusion region. The optical wavelength conversion element is disposed on the transmission path of the first light beam from the diffusion and rotation device, and the optical wavelength conversion element includes a first wavelength conversion region and a second wavelength conversion region disposed adjacently. The first wavelength conversion region is provided with a first wavelength conversion material, and the second wavelength conversion region is provided with a second wavelength conversion material. The first wavelength conversion material is a red phosphor or a yellow phosphor, and the second wavelength conversion material is a green phosphor. The heat resistance of the first wavelength conversion material is less than that of the second wavelength conversion material. The first wavelength conversion region is correspondingly inserted into the transmission path of the first light beam from the first diffusion region, and the second wavelength conversion region is correspondingly inserted into the transmission path of the first light beam from the second diffusion region. The first wavelength conversion region is used to convert the first light beam from the first diffusion region into a yellow or red first converted light beam, and the second wavelength conversion region is used to convert the first light beam from the second diffusion region into a green second converted light beam. The illumination beam includes the first converted light beam and the second converted light beam. The at least one light valve is disposed in the transmission path of the illumination beam to modulate the illumination beam into an image beam; and The projection lens is positioned on the transmission path of the image beam.

8. The projection device according to claim 7, characterized in that, In the radial direction of the diffusion rotation device, the diffusion degree of the two opposite sides of the first diffusion sub-region corresponding to the central portion of the first light spot is less than the diffusion degree of the first diffusion sub-region corresponding to the central portion of the first light spot, so as to homogenize the energy of the first light beam passing through the plurality of first diffusion sub-regions.

9. The projection device according to claim 7, characterized in that, The divergence angle of the first beam passing through the first diffusion region is greater than that of the first beam passing through the second diffusion region.

10. The projection device according to claim 7, characterized in that, The size of the light spot formed by the first beam passing through the first diffusion region on the first wavelength conversion region is larger than the size of the light spot formed by the first beam passing through the second diffusion region on the second wavelength conversion region.

11. The projection device according to claim 7, characterized in that, The first diffusion region and the second diffusion region are different diffusion elements.

12. The projection device according to claim 7, characterized in that, The diffusion rotation device further includes a light-transmitting region, wherein the first diffusion region, the second diffusion region, and the light-transmitting region are sequentially inserted into the transmission path of the first light beam, and wherein the light wavelength conversion element further includes a light-transmitting region that allows the first light beam from the light-transmitting region of the diffusion rotation device to pass through or a reflection region that reflects the first light beam from the light-transmitting region of the diffusion rotation device.

13. The projection device according to claim 7, characterized in that, The angle range covered by the first diffusion region of the diffusion rotation device relative to the central axis of the diffusion rotation device is the same as the angle range covered by the first wavelength conversion region of the optical wavelength conversion element relative to the central axis of the optical wavelength conversion element, and the angle range covered by the second diffusion region of the diffusion rotation device relative to the central axis of the diffusion rotation device is the same as the angle range covered by the second wavelength conversion region of the optical wavelength conversion element relative to the central axis of the optical wavelength conversion element.

14. The projection device according to claim 7, characterized in that, The lighting system also includes a second light source and a light-collecting element, wherein: The second light source is used to emit a second beam of light; and The light-collecting element is used to form the illumination beam, and the light-collecting element is disposed at least on the transmission path of the first conversion beam and the second beam, the illumination beam including the second beam.

15. The projection device according to claim 7, characterized in that, The optical wavelength conversion element further includes at least one filter region, the radial distance of the at least one filter region relative to the central axis of the optical wavelength conversion element being different from the radial distances of the first wavelength conversion region and the second wavelength conversion region relative to the central axis of the optical wavelength conversion element.

Images