Illumination system and projection device

Abstract

An illumination system is used for providing an illumination light beam. The illumination system comprises an excitation light source, a wavelength conversion element, first and second light splitting elements, and first and second dodging elements. The excitation light source is used for providing a laser beam. The wavelength conversion element sequentially converts the laser beam into at least one excited light beam and reflects the laser beam or allows the laser beam to pass through. The first light splitting element is used for allowing the laser beam to pass through to generate a first color light beam and allowing at least another part of the at least one excited light beam to pass through. The second light splitting element is used for allowing the laser beam to pass to generate a second color beam. The first dodging element and the second dodging element are respectively arranged on transmission paths of the first-color light beam and the second-color light beam. The illumination beam comprises a first color beam, a second color beam and a laser beam. The lighting system provided by the invention only comprises a single rotating wheel, so that the effects of controlling light beams with different wave bands and having good uniformity and color uniformity can be achieved.

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 through a projection lens to the projection target (for example, a screen or a wall) 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 source as the market demands for the brightness, color saturation, service life, and non-toxicity and environmental protection of projection devices.

[0003] However, in the current optical architecture, the lighting system needs to be equipped with two or more color wheel modules, one of which is a wavelength conversion color wheel equipped with phosphors, and the other is a color separation filter color wheel. However, such a configuration makes it impossible to adjust the light combination individually when the projected white image is biased towards a specific wavelength range (for example, reddish or greenish). In addition, using two or more color wheel modules will cause problems such as excessive noise and high cost.

[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 achieve the effect of controlling light beams of different wavelength bands with good uniformity and color uniformity by using only a single rotating wheel.

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

[0007] In order 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 element, a first spectroscopic element, a second spectroscopic element, a first light homogenizing element and a second light homogenizing element. The excitation light source is used to provide a laser beam. The wavelength conversion element includes a rotating wheel, which is arranged on the transmission path of the laser beam from the excitation light source, and the laser beam is converted into at least one excited beam and reflects the laser beam or allows the laser beam to pass through in a timely manner by rotating the rotating wheel. The first spectroscopic element is arranged on the transmission path of the laser beam from the excitation light source and on the transmission path of at least one excited beam from the wavelength conversion element, and is used to allow the laser beam to pass through, reflect at least a portion of at least one excited beam to generate a first color beam, and allow at least another portion of at least one excited beam to pass through. The second beam splitter is configured on the transmission path of the laser beam from the excitation light source and on the transmission path of at least another part of at least one excited beam from the wavelength conversion element, so as to allow the laser beam to pass through and reflect at least another part of at least one excited beam to generate a second color beam, wherein the wavelength band of at least one excited beam includes the wavelength band of the first color beam and the wavelength band of the second color beam. The first light homogenizing element is configured on the transmission path of the first color beam from the first beam splitter. The second light homogenizing element is configured on the transmission path of the second color beam from the second beam splitter. The illumination beam includes the first color beam, the second color beam and the laser beam. The illumination system includes only a single rotating wheel.

[0008] In order 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. The illumination system is used to provide an illumination beam. The illumination system includes an excitation light source, a wavelength conversion element, a first spectroscopic element, a second spectroscopic element, a first uniform light element and a second uniform light element. The excitation light source is used to provide a laser beam. The wavelength conversion element includes a rotating wheel, which is arranged on the transmission path of the laser beam from the excitation light source, and the laser beam is converted into at least one excited beam and the laser beam is reflected or allowed to pass through in a timely manner by rotating the rotating wheel. The first spectroscopic element is arranged on the transmission path of the laser beam from the excitation light source and on the transmission path of at least one excited beam from the wavelength conversion element, and is used to allow the laser beam to pass through, reflect at least a portion of at least one excited beam to generate a first color beam, and allow at least another portion of at least one excited beam to pass through. The second beam splitter is configured on the transmission path of the laser beam from the excitation light source and on the transmission path of at least another part of at least one excited beam from the wavelength conversion element, so as to allow the laser beam to pass through and reflect at least another part of at least one excited beam to generate a second color beam, wherein the wavelength band of at least one excited beam includes the wavelength band of the first color beam and the wavelength band of the second color beam. The first light homogenizing element is configured on the transmission path of the first color beam from the first beam splitter. The second light homogenizing element is configured on the transmission path of the second color beam from the second beam splitter. The illumination beam includes the first color beam, the second color beam and the laser beam. The illumination system includes only a single rotating wheel. At least one light valve is configured on the transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is configured on the transmission path of the image beam to project the image beam out of the projection device.

[0009] Based on the above, in the illumination system and projection device of the present invention, the illumination system includes an excitation light source, a wavelength conversion element, a first beam splitter element, a second beam splitter element, a first light homogenizing element and a second light homogenizing element. The excitation light source is used to provide a laser beam. The wavelength conversion element sequentially converts the laser beam into at least one excited beam and reflects the laser beam or allows the laser beam to pass. The first beam splitter element is used to allow the laser beam to pass, reflect at least a portion of at least one excited beam to generate a first color beam, and allow at least another portion of at least one excited beam to pass. The second beam splitter element is used to allow the laser beam to pass and reflect at least another portion of at least one excited beam to generate a second color beam. The first light homogenizing element is configured on the transmission path of the first color beam. The second light homogenizing element is configured on the transmission path of the second color beam. The illumination beam includes a first color beam, a second color beam and a laser beam. The illumination system includes only a single rotating wheel. Therefore, through the above configuration, the illumination system uses only a single rotating wheel to achieve control of beams of different wavelengths and has good uniformity and color uniformity. In this way, the overall structure of the lighting system can be made smaller, the cost can be reduced, and the noise can be reduced while maintaining good optical effects.

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

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

[0012] FIG. 2A to FIG. 2D They are schematic diagrams of a projection device according to an embodiment of the present invention at different time sequences.

[0013] Figure 3 FIG. 4 is a schematic diagram of a wavelength conversion element according to an embodiment of the present invention.

[0014] FIG. 4A to FIG. 4D They are schematic diagrams of a projection device under different time sequences according to another embodiment of the present invention.

[0015] Figure 5 FIG. 4 is a schematic diagram of a wavelength conversion element according to another embodiment of the present invention.

[0016] FIG. 6A to FIG. 6D They are schematic diagrams of a projection device under different time sequences according to another embodiment of the present invention.

[0017] FIG. 7A to FIG. 7D They are schematic diagrams of a projection device under different time sequences according to another embodiment of the present invention.

[0018] Description of reference numerals:

[0019] 10,10A: Projection device

[0020] 60: Light valve

[0021] 62: First light valve

[0022] 64: Second light valve

[0023] 70: Projection lens

[0024] 100,100A,100B: Lighting system

[0025] 110: Excitation light source

[0026] 120,120A: Wavelength conversion element

[0027] 122: Rotating Wheel

[0028] 124,124A: Non-excitation area

[0029] 130: First beam splitter

[0030] 140: Second beam splitter

[0031] 150: First light homogenization element

[0032] 160: Second light homogenization element

[0033] 170: First filter element

[0034] 180: Second filter element

[0035] 190: Reflective element

[0036] F1: Orange fluorescent material

[0037] F2: Green fluorescent material

[0038] F3: Yellow fluorescent material

[0039] L1: Laser beam

[0040] L2: stimulated beam

[0041] L21: First stimulated beam

[0042] L22: Second stimulated beam

[0043] L231: Part I

[0044] L232: Part 2

[0045] L23: The third excited beam

[0046] L31: First color beam

[0047] L32: Second color beam

[0048] LB: Lighting beam

[0049] LI: Image beam. DETAILED DESCRIPTION

[0050] The above-mentioned 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 back, etc., are only the directions with reference to the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0051] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 1 The present embodiment provides a projection device 10, including an illumination system 100, at least one light valve 60, and a projection lens 70. The illumination system 100 is used to provide an illumination beam LB. The at least one light valve 60 is disposed on the transmission path of the illumination beam LB 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.

[0052] The light valve 60 is, for example, a reflective light modulator such as a Liquid Crystal On Silicon panel (LCoS panel) or a Digital Micro-mirror Device (DMD). In some embodiments, the light valve 60 may also be a transmissive light modulator such as a Transparent Liquid Crystal Panel, an Electro-Optical Modulator, a Magneto-Optic modulator, or an Acousto-Optic Modulator (AOM). The present invention does not limit the type and kind of the light valve 60. The detailed steps and implementation methods of the method of converting the illumination light beam LB into the image light beam LI by the light valve 60 can be sufficiently taught, suggested, and implemented by the common knowledge in the relevant technical field, so they are not repeated here. In the present embodiment, the number of the light valve 60 is one, for example, a single digital micro-mirror device is used, but in other embodiments, there may be multiple light valves, and the present invention is not limited thereto.

[0053] The projection lens 70 includes, for example, a combination of one or more optical lenses with diopter, such as various combinations of non-planar lenses such as biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 70 may also include a planar optical lens to project the image beam LI from the light valve 60 to the projection target in a reflective manner. The present invention does not limit the type and type of the projection lens 70.

[0054] FIG. 2A to FIG. 2D They are schematic diagrams of a projection device according to an embodiment of the present invention at different time sequences. FIG. 2A to FIG. 2D The illumination system 100 includes an excitation light source 110, a wavelength conversion element 120, a first beam splitter element 130, a second beam splitter element 140, a first light homogenizing element 150, and a second light homogenizing element 160. The excitation light source 110 is used to provide a laser beam L1. The excitation light source 110 is, for example, a blue laser diode (LD) for providing a blue laser beam L1.

[0055] Figure 3 Schematic diagram of a wavelength conversion element according to an embodiment of the present invention. Figures 2A to 3 . Figure 3 The wavelength conversion element 120 shown can be applied to at least FIG. 2A to FIG. 2D The wavelength conversion element 120 includes a rotating wheel 122, which is disposed on the transmission path of the laser beam L1 from the excitation light source 110. The rotating wheel 122 is rotated to sequentially convert the laser beam L1 into at least one excited beam L2 and reflect the laser beam L1 or allow the laser beam L1 to pass. In detail, the rotating wheel 122 of the wavelength conversion element 120 has an excitation area and a non-excitation area 124. At least one wavelength conversion material is disposed in the excitation area. When the laser beam L1 is incident on the excitation area, the laser beam L1 can be converted into at least one excited beam L2. When the laser beam L1 is incident on the non-excitation area, the non-excitation area can reflect the laser beam L1 or allow the laser beam L1 to pass. For example, in one embodiment, the excitation region of the wavelength conversion element 120 has only a single type of wavelength conversion material, such as a yellow fluorescent material, for converting the blue band laser beam L1 into a yellow band excited beam L2, the central wavelength range of the excited beam L2 is, for example, between 525 nanometers and 575 nanometers, and a portion of the excited beam L2 is separated by subsequent optical elements to generate red, green or other wavelength band beams, but the present invention is not limited to this.

[0056] For example, in another embodiment, the wavelength conversion element 120 has two wavelength conversion materials of different types, such as an orange fluorescent material and a green fluorescent material, and sequentially converts the laser beam L1 into a first excited beam in an orange wavelength band and a second excited beam in a green wavelength band, wherein the central wavelength range of the first excited beam in the orange wavelength band is, for example, between 550 nanometers and 600 nanometers, and the central wavelength range of the second excited beam in the green wavelength band is, for example, between 500 nanometers and 550 nanometers. In other words, in this embodiment, the excited beam L2 includes at least one of the first excited beam and the second excited beam. In addition, in yet another embodiment, the two wavelength conversion materials of the wavelength conversion element 120 are, for example, a red fluorescent material and a green fluorescent material, and sequentially converts the laser beam L1 into a first excited beam in a red wavelength band and a second excited beam in a green wavelength band.

[0057] And in Figures 2A to 3 In the embodiment of the present invention, the excitation region of the wavelength conversion element 120 has three wavelength conversion materials of different types, such as an orange fluorescent material F1, a green fluorescent material F2, and a yellow fluorescent material F3, and the orange fluorescent material F1, the green fluorescent material F2, and the yellow fluorescent material F3 of the excitation region sequentially enter the transmission path of the laser beam L1 to convert the laser beam L1 into a first excited beam L21 of an orange wavelength band (such as Figure 2A As shown), the second excited light beam L22 in the green band (as shown Figure 2B As shown) and the third excited light beam L23 in the yellow band (as shown Figure 2C ). In other words, in this embodiment, the stimulated light beam L2 includes at least one of the first stimulated light beam L21, the second stimulated light beam L22 and the third stimulated light beam L23. The third stimulated light beam L23 can be used to increase the brightness of the illumination light beam LB output by the illumination system 100. In addition, in another embodiment, the orange fluorescent material F1 can also be replaced with a red fluorescent material to convert the laser beam L1 into a first stimulated light beam in the red band, and the configuration of the wavelength conversion material in the excitation region is not limited to the above-mentioned. On the other hand, in this embodiment, the non-excitation region 124 of the wavelength conversion element 120 is, for example, provided with a light-transmitting glass to allow the laser beam L1 to pass through, such as Figure 2D In another embodiment, the non-excitation region 124 of the wavelength conversion element 120 is, for example, a hollow structure, that is, no optical element is disposed on the non-excitation region 124, and has an area that completely penetrates the rotating wheel 122 for the laser beam L1 incident on the non-excitation region 124 to pass through. In addition, the configuration of the non-excitation region 124 of the wavelength conversion element 120 is not limited to the above examples.

[0058] Please refer to FIG. 2A to FIG. 2DThe first beam splitter 130 is disposed on the transmission path of the laser beam L1 from the excitation light source 110 and the transmission path of the stimulated beam L2 from the wavelength conversion element 120, and is used to allow the laser beam L1 to pass through, and reflect at least a portion of the stimulated beam L2 to generate a first color beam L31, and allow at least another portion of the stimulated beam L2 to pass through. The second beam splitter 140 is disposed on the transmission path of the laser beam L1 from the excitation light source 110 and the transmission path of at least another portion of the stimulated beam L2 from the wavelength conversion element 120, and is used to allow the laser beam L1 to pass through, and reflect at least another portion of the stimulated beam L2 to generate a second color beam L32, wherein the wavelength band of the stimulated beam L2 includes the wavelength band of the first color beam L31 and the wavelength band of the second color beam L32. In other words, the wavelength band of the first stimulated beam L21 includes the wavelength band of the first color beam L31, and the wavelength band of the second stimulated beam L22 includes the wavelength band of the second color beam L32.

[0059] Specifically, in this embodiment, the first beam splitter element 130 is, for example, a red light reflecting beam splitter (DichroicMirror), and the second beam splitter element 140 is, for example, a green-red light reflecting beam splitter. In other words, in this embodiment, the reflection wavelength range of the second beam splitter element 140 includes the reflection wavelength range of the first beam splitter element 130, so that the manufacturing difficulty of the second beam splitter element 140 can be reduced. In another embodiment, the reflection wavelength range of the second beam splitter element 140 may not include the reflection wavelength range of the first beam splitter element 130, for example: the first beam splitter element 130 is a red light reflecting beam splitter, and the second beam splitter element 140 is a green light reflecting beam splitter, but it is not limited thereto.

[0060] exist Figure 2A In the timing sequence shown, when the laser beam L1 is transmitted to the orange fluorescent material F1 (refer to Figure 3 ), the wavelength conversion element 120 converts the laser beam L1 into a first excited beam L21 in an orange wavelength band, and the first excited beam L21 is then transmitted from the wavelength conversion element 120 to the first beam splitter element 130 and reflected by the first beam splitter element 130. Figure 2B In the timing sequence shown, when the laser beam L1 is transmitted to the green fluorescent material F2 (refer to Figure 3 ), the wavelength conversion element 120 converts the laser beam L1 into a second excited beam L22 in the green wavelength band, and the second excited beam L22 is then transmitted from the wavelength conversion element 120 through the first beam splitter element 130 and to the second beam splitter element 140 and reflected by the second beam splitter element 140. Figure 2C In the timing sequence shown, when the laser beam L1 is transmitted to the yellow fluorescent material F3 (refer to Figure 3), the wavelength conversion element 120 converts the laser beam L1 into a third excited beam L23 in the yellow wavelength band, and the third excited beam L23 is then transmitted from the wavelength conversion element 120 to the first beam splitter element 130. The third excited beam L23 in the yellow wavelength band includes a first portion L231 (for example, a red light portion) and a second portion L232 (for example, a green light portion). When the third excited beam L23 in the yellow wavelength band is transmitted to the first beam splitter element 130, the first portion L231 of the third excited beam L23 will be reflected by the first beam splitter element 130, and the second portion L232 of the third excited beam L23 will pass through the first beam splitter element 130 and be transmitted to the second beam splitter element 140, and the second portion L232 of the third excited beam L23 will be reflected by the second beam splitter element 140. In addition, Figure 2D In the timing shown, the laser beam L1 passing through the wavelength conversion element 120 is guided by at least one optical element and transmitted through the second beam splitter 140. In another embodiment, the laser beam L1 from the wavelength conversion element 120 may also be guided by at least one optical element and transmitted through the first beam splitter 130.

[0061] The first light homogenizing element 150 is disposed on the transmission path of the first color light beam L31 from the first beam splitter 130, and the second light homogenizing element 160 is disposed on the transmission path of the second color light beam L32 from the second beam splitter 140. The first light homogenizing element 150 and the second light homogenizing element 160 are used to adjust the light spot shape of the first color light beam L31 and the second color light beam L32, so that the light spot shape of the formed illumination light beam LB can match the shape of the working area of ​​the light valve 60 (for example, a rectangle), and make the light spot have consistent or similar light intensity at all places, and uniform the light intensity of the illumination light beam LB. In this embodiment, the first light homogenizing element 150 and the second light homogenizing element 160 are, for example, integrating rods, but in other embodiments, the first light homogenizing element 150 and the second light homogenizing element 160 can also be other appropriate types of optical elements, such as a lens array. In detail, the first light homogenizing element 150 and the second light homogenizing element 160 can also be fly eye lens arrays, but the present invention is not limited thereto. In this embodiment, the light incident surface areas of the first light homogenizing element 150 and the second light homogenizing element 160 can be designed to be the same. However, in other embodiments, the light incident surface area of ​​the first light homogenizing element 150 and the light incident surface area of ​​the second light homogenizing element 160 can be designed to be different, and the larger the light incident surface area, the larger the output angle of the light beam after homogenization. In detail, the light incident surface area of ​​the first light homogenizing element 150 and the light incident surface area of ​​the second light homogenizing element 160 can be designed accordingly according to the area ratio of different types of wavelength conversion materials in the wavelength conversion element 120. In this way, different light incident surface areas can be designed for different wavelength light beams with different divergence angles, and then the light beams of different wavelengths can be optimized and adjusted to improve the optical quality of the illumination beam LB.

[0062] In addition, the first light homogenizing element 150 and the second light homogenizing element 160 can also be used to adjust the spot shapes of the first portion L231 of the third excited light beam L23 and the second portion L232 of the third excited light beam L23. Specifically, when the excited light beam L2 further includes the third excited light beam L23, the first portion L231 of the third excited light beam L23 will be reflected by the first light splitting element 130, and then transmitted to the first light homogenizing element 150 for homogenization, while the second portion L232 of the third excited light beam L23 will be reflected by the second light splitting element 140, and then transmitted to the second light homogenizing element 160 for homogenization. That is, in the third excited light beam L23 in the yellow band, the optical path of the first portion L231 of the third excited light beam L23 is the same as the optical path of the first color light beam L31, and the optical path of the second portion L232 of the third excited light beam L23 is the same as the optical path of the second color light beam L32. In one embodiment, the laser beam L1 from the wavelength conversion element 120 enters the second light homogenizing element 160 for homogenization after passing through the second light splitting element 140. In another embodiment, the laser beam L1 from the wavelength conversion element 120 may also enter the first light homogenizing element 150 for homogenization after passing through the first light splitting element 130.

[0063] In the present embodiment, the illumination system 100 further includes a first filter element 170 and a second filter element 180 for filtering out stray light of other wavelength bands. The first filter element 170 is disposed on a transmission path of the first color light beam L31 (or the first portion L231 of the third excited light beam L23) passing through the first beam splitter element 130 and the first light homogenizing element 150, and the second filter element 180 is disposed on a transmission path of the second color light beam L32 (or the second portion L232 of the third excited light beam L23) passing through the second beam splitter element 140 and the second light homogenizing element 160. In the present embodiment, the first filter element 170 is, for example, a red filter, and the second filter element 180 is, for example, a green filter. For example, after entering the orange fluorescent material F1 of the wavelength conversion element 120, the laser beam L1 is converted into a first excited beam L21 in an orange wavelength band. After passing through the first beam splitter 130 and the first filter element 170, light of an unnecessary wavelength band can be filtered out, so that the first color beam L31 has a relatively pure color and serves as the red light portion of the illumination beam LB. Similarly, after passing through the second beam splitter 140 and the second filter element 180, the second color beam L32 can serve as the green light portion of the illumination beam LB.

[0064] In summary of the above paragraphs, in this embodiment, the light beam transmitted by the first light homogenizing element 150 or the second light homogenizing element 160 is the illumination light beam LB, and the illumination light beam LB includes the first color light beam L31, the second color light beam L32, and the laser light beam L1. In other embodiments, the illumination light beam LB may further include the first part L231 of the third excited light beam L23 and the second part L232 of the third excited light beam L23. In addition, it is worth mentioning that through the above configuration, the illumination system 100 uses only a single rotating wheel to control light beams of different wavelengths and has good uniformity and color uniformity. In this way, the overall structure of the illumination system 100 can be made smaller, the cost can be reduced, and the noise can be reduced, while maintaining a good optical effect.

[0065] FIG. 4A to FIG. 4D They are schematic diagrams of a projection device under different time sequences according to another embodiment of the present invention. Figure 5 FIG. 1 is a schematic diagram of a wavelength conversion element according to another embodiment of the present invention. Figure 5 The wavelength conversion element 120A shown can be applied to at least FIG. 4A to FIG. 4D The lighting system 100A in FIG. 1 is used as an example in the following description. FIG. 4A to FIG. 4D . FIG. 4A to FIG. 4D The projection device 10 shown is similar to FIG. 2A to FIG. 2D The projection device 10 shown. However, the difference between the two is that, in the present embodiment, the non-excitation area 124A of the wavelength conversion element 120A used in the illumination system 100A has, for example, a reflective layer. The reflective layer can be made by coating a reflective material or by providing a reflective element such as a reflector, but is not limited thereto. The non-excitation area 124A is used to reflect the laser beam L1, and the illumination system 100A also includes a reflective element 190, which is arranged on the transmission path of the laser beam L1 from the wavelength conversion element 120A, and is used to reflect the laser beam L1, so that the laser beam L1 that penetrates the second beam splitter element 140 is reflected by the reflective element 190 and then passes through the second beam splitter element 140 and the second light homogenizing element 160 in sequence, as shown in FIG. Figure 4D As shown. FIG. 4A to FIG. 4C As shown, when the laser beam L1 is transmitted to the excitation region (i.e., the orange fluorescent material F1, the green fluorescent material F2, and the yellow fluorescent material F3) of the wavelength conversion element 120A, the optical paths of the converted excited beam and the generated first color beam, second color beam, etc. are all the same as FIG. 2A to FIG. 2C Similarly, no further description is given here. Therefore, in this embodiment, the lighting system 100A also uses only a single rotating wheel to control light beams of different wavelength bands with good uniformity and color uniformity. In this way, the overall structure of the lighting system 100A is smaller, the cost is reduced, and the noise is reduced, while maintaining a good optical effect.

[0066] FIG. 6A to FIG. 6DThey are schematic diagrams of a projection device according to another embodiment of the present invention at different time sequences. FIG. 6A to FIG. 6D . FIG. 6A to FIG. 6D The projection device 10 shown is similar to FIG. 4A to FIG. 4D The projection device 10 shown in the figure. However, the difference between the two is that, in the present embodiment, the first filter element 170 and the second filter element 180 are omitted in the illumination system 100B. Therefore, the number of optical elements of the illumination system 100B can be reduced, thereby reducing the volume. In addition, since the first filter element 170 and the second filter element 180 are omitted, the reflection band range of the first spectrometer element 130 and the second spectrometer element 140 can be adjusted accordingly. For example, the second spectrometer element 140 can be modified to select a narrower-band reflection green light spectrometer, but the present invention is not limited to this. Similarly, the design of omitting the first filter element and the second filter element in the illumination system can also be applied to similar FIG. 2A to FIG. 2D The projection device 10 shown is not limited thereto. Therefore, in this embodiment, the illumination system 100B also uses only a single rotating wheel to achieve control of light beams of different wavelength bands with good uniformity and color uniformity. In this way, the overall structure of the illumination system 100B is smaller, costs are reduced, noise is reduced, and good optical effects can be maintained at the same time.

[0067] FIG. 7A to FIG. 7D They are schematic diagrams of a projection device according to another embodiment of the present invention at different time sequences. FIG. 7A to FIG. 7D . FIG. 7A to FIG. 7D The projection device 10A shown is similar to FIG. 2A to FIG. 2D The projection device 10 shown in the figure is different from the projection device 10 in the embodiment. However, in the embodiment, at least one light valve 60 includes a first light valve 62 and a second light valve 64. The first light valve 62 is arranged on the transmission path of the illumination light beam LB (such as the first color light beam L31 or the first part L231 of the third excited light beam L23) from the first light homogenizing element 150, and the second light valve 64 is arranged on the transmission path of the illumination light beam LB (such as the second color light beam L32 or the second part L232 of the third excited light beam L23) from the second light homogenizing element 160. Similarly, the design of configuring multiple light valves can also be applied to similar FIG. 4A to FIG. 4D The projection device 10 shown is not limited to this. Therefore, in this embodiment, the illumination system 100 also uses only a single rotating wheel to control light beams of different wavelengths and has good uniformity and color uniformity. In addition, the illumination light beams LB of different wavelengths are respectively transmitted to different light valves 60 to form image light beams LI respectively, which can further improve the uniformity of the picture and color. In this way, the overall structure of the illumination system 100 is smaller, the cost is reduced, and the noise is reduced, while maintaining a good optical effect.

[0068] In summary, in the illumination system and projection device of the present invention, the illumination system includes an excitation light source, a wavelength conversion element, a first beam splitter element, a second beam splitter element, a first light homogenizing element and a second light homogenizing element. The excitation light source is used to provide a laser beam. The wavelength conversion element sequentially converts the laser beam into at least one excited beam and reflects the laser beam or allows the laser beam to pass. The first beam splitter element is used to allow the laser beam to pass, reflect at least a portion of at least one excited beam to generate a first color beam, and allow at least another portion of at least one excited beam to pass. The second beam splitter element is used to allow the laser beam to pass and reflect at least another portion of at least one excited beam to generate a second color beam. The first light homogenizing element is configured on the transmission path of the first color beam. The second light homogenizing element is configured on the transmission path of the second color beam. The illumination beam includes a first color beam, a second color beam and a laser beam. The illumination system includes only a single rotating wheel. Therefore, through the above configuration, the illumination system uses only a single rotating wheel to achieve control of beams of different wavelengths and has good uniformity and color uniformity. In this way, the overall structure of the lighting system can be made smaller, the cost can be reduced, and the noise can be reduced while maintaining good optical effects.

[0069] However, the above is only a preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the claims and the content of the invention of the present invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and title (invention name) are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit on the number of elements.

Claims

1. A lighting system for providing a lighting beam, characterized in that: The illumination system comprises an excitation light source, a wavelength conversion element, a first light splitting element, a second light splitting element, 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 element includes a rotating wheel, which is disposed on the transmission path of the laser beam from the excitation light source, and is used to sequentially convert the laser beam into at least one excited beam and reflect the laser beam or allow the laser beam to pass by rotating the rotating wheel; The first beam splitter is disposed on the transmission path of the laser beam from the excitation light source and the transmission path of the at least one excited beam from the wavelength conversion element, and is used to allow the laser beam to pass through, reflect at least a portion of the at least one excited beam to generate a first color beam, and allow at least another portion of the at least one excited beam to pass through; The second beam splitter is disposed on a transmission path of the laser beam from the excitation light source and on a transmission path of the at least another portion of the at least one excited beam from the wavelength conversion element, and is used to allow the laser beam to pass through and reflect the at least another portion of the at least one excited beam to generate a second color beam, wherein the wavelength band of the at least one excited beam includes the wavelength band of the first color beam and the wavelength band of the second color beam; The first light homogenizing element is disposed on a transmission path of the first color light beam from the first light splitting element; and The second light homogenizing element is disposed on a transmission path of the second color light beam from the second light splitting element. The illumination light beam includes the first color light beam, the second color light beam and the laser light beam. The illumination system includes only the single rotating wheel.

2. The lighting system according to claim 1, characterized in that The at least one stimulated beam includes a first stimulated beam and a second stimulated beam. The wavelength conversion element sequentially converts the laser beam into the first stimulated beam and the second stimulated beam. The wavelength band of the first stimulated beam includes the wavelength band of the first color beam, and the wavelength band of the second stimulated beam includes the wavelength band of the second color beam.

3. The lighting system according to claim 2, characterized in that The at least one stimulated light beam further includes a third stimulated light beam, the wavelength conversion element further sequentially converts the laser beam into the third stimulated light beam, the third stimulated light beam at least includes a first part and a second part, the first beam splitter element is used to reflect the first part of the third stimulated light beam, and the second beam splitter element is used to reflect the second part of the third stimulated light beam, and the illumination light beam further includes the first part of the third stimulated light beam and the second part of the third stimulated light beam.

4. The lighting system according to claim 1, characterized in that The reflection wavelength range of the second beam splitter element includes the reflection wavelength range of the first beam splitter element.

5. The lighting system according to claim 1, characterized in that: The light incident surface area of ​​the first light homogenizing element is different from the light incident surface area of ​​the second light homogenizing element.

6. The lighting system according to claim 1, characterized in that The wavelength conversion element is used to allow the laser beam to pass through, and the laser beam from the wavelength conversion element passes through the second beam splitting element and the second light homogenizing element in sequence.

7. The lighting system according to claim 1, characterized in that The wavelength conversion element is used to reflect the laser beam, and the lighting system also includes a reflective element, which is arranged on the transmission path of the laser beam from the wavelength conversion element and is used to reflect the laser beam so that the laser beam passes through the second light homogenizing element after being reflected by the reflective element.

8. The lighting system according to claim 1, characterized in that: The illumination system further comprises a first filter element and a second filter element, wherein: The first filter element is disposed on a transmission path of the first color light beam between the first beam splitting element and the first light homogenizing element; and The second filter element is disposed on a transmission path of the second color light beam passing between the second beam splitting element and the second light homogenizing element.

9. A projection device, characterized in that: The projection device comprises an illumination system, at least one light valve and a projection lens, wherein: The illumination system is used to provide an illumination beam, and includes an excitation light source, a wavelength conversion element, a first light splitting element, a second light splitting element, 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 element includes a rotating wheel, which is disposed on the transmission path of the laser beam from the excitation light source, and is used to sequentially convert the laser beam into at least one excited beam and reflect the laser beam or allow the laser beam to pass by rotating the rotating wheel; The first beam splitter is disposed on the transmission path of the laser beam from the excitation light source and the transmission path of the at least one excited beam from the wavelength conversion element, and is used to allow the laser beam to pass through, reflect at least a portion of the at least one excited beam to generate a first color beam, and allow at least another portion of the at least one excited beam to pass through; The second beam splitter is disposed on a transmission path of the laser beam from the excitation light source and on a transmission path of the at least another portion of the at least one excited beam from the wavelength conversion element, and is used to allow the laser beam to pass through and reflect the at least another portion of the at least one excited beam to generate a second color beam, wherein the wavelength band of the at least one excited beam includes the wavelength band of the first color beam and the wavelength band of the second color beam; The first light homogenizing element is disposed on a transmission path of the first color light beam from the first light splitting element; and The second light homogenizing element is disposed on the transmission path of the second color light beam from the second light splitting element, the illumination light beam includes the first color light beam, the second color light beam and the laser light beam, and the illumination system includes only a single rotating wheel; the at least one light valve is disposed on the transmission path of the illumination light beam to convert the illumination light beam into an image light beam; and The projection lens is arranged on the transmission path of the image light beam and is used for projecting the image light beam out of the projection device.

10. The projection device according to claim 9, characterized in that: The at least one stimulated beam includes a first stimulated beam and a second stimulated beam. The wavelength conversion element sequentially converts the laser beam into the first stimulated beam and the second stimulated beam. The wavelength band of the first stimulated beam includes the wavelength band of the first color beam, and the wavelength band of the second stimulated beam includes the wavelength band of the second color beam.

11. The projection device according to claim 10, characterized in that: The at least one stimulated light beam further includes a third stimulated light beam, the wavelength conversion element further sequentially converts the laser beam into the third stimulated light beam, the third stimulated light beam at least includes a first part and a second part, the first beam splitter element is used to reflect the first part of the third stimulated light beam, and the second beam splitter element is used to reflect the second part of the third stimulated light beam, and the illumination light beam further includes the first part of the third stimulated light beam and the second part of the third stimulated light beam.

12. The projection device according to claim 9, characterized in that: The reflection wavelength range of the second beam splitter element includes the reflection wavelength range of the first beam splitter element.

13. The projection device according to claim 9, characterized in that: The light incident surface area of ​​the first light homogenizing element is different from the light incident surface area of ​​the second light homogenizing element.

14. The projection device according to claim 9, characterized in that: The wavelength conversion element is used to allow the laser beam to pass through, and the laser beam from the wavelength conversion element passes through the second beam splitting element and the second light homogenizing element in sequence.

15. The projection device according to claim 9, characterized in that: The wavelength conversion element is used to reflect the laser beam, and the lighting system also includes a reflective element, which is arranged on the transmission path of the laser beam from the wavelength conversion element and is used to reflect the laser beam so that the laser beam passes through the second light homogenizing element after being reflected by the reflective element.

16. The projection device according to claim 9, characterized in that: The lighting system also includes a first filter element and a second filter element. The first filter element is configured on a transmission path of the first color light beam passing through the first splitter element and the first light homogenizing element, and the second filter element is configured on a transmission path of the second color light beam passing through the second splitter element and the second light homogenizing element.

17. The projection device according to claim 9, characterized in that: The at least one light valve includes a first light valve and a second light valve. The first light valve is disposed on a transmission path of the illumination light beam from the first light homogenizing element, and the second light valve is disposed on a transmission path of the illumination light beam from the second light homogenizing element.

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