Illumination system and projection device

Abstract

An illumination system comprises a laser light source, a wavelength conversion element, a first supplementary light source and a light splitting element. The laser light source provides a laser beam. The wavelength conversion element is used for converting the laser beam into a converted beam. The first supplementary light source is used for providing a first supplementary light beam. The light splitting element meets one of the following conditions: (1) the light splitting element is used for allowing a laser beam to pass through, allowing a first supplementary beam with a first polarization state to pass through, and reflecting a conversion beam with a second polarization state; or (2) to reflect the laser beam, to reflect the first supplemental beam having the second polarization state, and to pass the converted beam having the first polarization state. According to the lighting system and the projection device comprising the lighting system, the use efficiency of light can be improved so as to achieve a good optical effect.

Description

Technical Field

[0001] The present invention relates to an optical device, and more particularly to an illumination system and a projection device. Background Art

[0002] A projection device (projector) is a display device used to produce large-scale images. Current projection device illumination systems often use a blue laser to excite a yellow-green fluorescent light (converted light beam) as the source of the illumination beam. To achieve enhanced optical performance, additional red and / or green lasers are used as supplemental light sources. However, in order for the dichroic element (dichroic mirror) to guide the additional red and / or green laser light, the dichroic element loses energy from a portion of the yellow-green fluorescent light's wavelength band, reducing optical efficiency and, consequently, poorer projected image quality.

[0003] The "Background" section is intended only to facilitate understanding of the present invention. Therefore, the information disclosed in this section may contain information that is not already known to those skilled in the art. The information disclosed in this section does not imply that the information or the problems to be solved by one or more embodiments of the present invention were known or understood by those skilled in the art prior to the filing of this application. Summary of the Invention

[0004] The present invention provides a lighting system and a projection device, which can improve the efficiency of light use to achieve good optical effects.

[0005] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0006] In order to achieve one or part or all of the above-mentioned purposes or other purposes, the present invention provides an illumination system, comprising a laser light source, a wavelength conversion element, a first supplementary light source and a spectroscopic element. The laser light source is used to provide a laser beam, the wavelength of which is within a first wavelength range. The wavelength conversion element is arranged on the transmission path of the laser beam. The wavelength conversion element is used to convert the laser beam into a converted beam. The first supplementary light source is used to provide a first supplementary light beam, the wavelength of which is within a second wavelength range. The polarization state of the first supplementary light beam includes a first polarization state and a second polarization state. The spectroscopic element is arranged on the transmission path of the excitation beam, the first supplementary light beam and the converted light beam. The spectroscopic element meets one of the following conditions: (1) it is used to allow a laser beam with a wavelength within a first wavelength range to pass through, to allow a first supplementary beam with a wavelength within a second wavelength range and a first polarization state to pass through, and to reflect a converted beam with a wavelength within the second wavelength range and a second polarization state; or (2) it is used to reflect a laser beam with a wavelength within the first wavelength range, to reflect the first supplementary beam with a wavelength within the second wavelength range and a second polarization state, and to allow a converted beam with a wavelength within the second wavelength range and a first polarization state to pass through.

[0007] In order to achieve one or part or all of the above-mentioned 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 a laser light source, a wavelength conversion element, a first supplementary light source and a spectroscopic element. The laser light source is used to provide a laser beam, the wavelength of which is within a first wavelength range. The wavelength conversion element is configured on the transmission path of the laser beam. The wavelength conversion element is used to convert the laser beam into a conversion beam. The first supplementary light source is used to provide a first supplementary light beam, the wavelength of which is within a second wavelength range. The polarization state of the first supplementary light beam includes a first polarization state and a second polarization state. The spectroscopic element is configured on the transmission path of the excitation beam, the first supplementary light beam and the conversion beam. The spectrometer meets one of the following conditions: (1) it allows a laser beam with a wavelength within a first wavelength range to pass through, allows a first supplementary beam with a wavelength within a second wavelength range and a first polarization state to pass through, and reflects a converted beam with a wavelength within the second wavelength range and a second polarization state; or (2) it reflects a laser beam with a wavelength within the first wavelength range, reflects the first supplementary beam with a wavelength within the second wavelength range and a second polarization state, and allows a converted beam with a wavelength within the second wavelength range and a first polarization state to pass through. At least one light valve is disposed in the transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is disposed in the transmission path of the image beam to project the image beam out of the projection device.

[0008] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects: In the lighting system and projection device with a supplementary light source of the present invention, the design of the beam splitter element can improve the efficiency of light use to achieve a good optical effect.

[0009] 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

[0010] Figure 1 FIG. 1 is a schematic diagram of a projection device according to an embodiment of the present invention.

[0011] Figure 2 FIG. 1 is a schematic diagram of a lighting system according to an embodiment of the present invention.

[0012] Figure 3 for Figure 2 Reflectivity curves of the spectroscopic elements of the lighting system in different bands.

[0013] Figure 4 FIG. 4 is a schematic diagram of a lighting system according to another embodiment of the present invention.

[0014] Figure 5 FIG. 4 is a schematic diagram of a lighting system according to another embodiment of the present invention.

[0015] Figure 6 for Figure 5 Reflectivity curves of the spectroscopic elements of the lighting system in different bands.

[0016] Figure 7 FIG. 4 is a schematic diagram of a lighting system according to another embodiment of the present invention.

[0017] Figure 8 FIG. 4 is a schematic diagram of a lighting system according to another embodiment of the present invention.

[0018] Figure 9 for Figure 8 Reflectivity curves of the spectroscopic elements of the lighting system in different bands.

[0019] Description of reference numerals:

[0020] 10: Projection device;

[0021] 60: light valve;

[0022] 70: projection lens;

[0023] 100, 100A, 100B, 100C, 100D: lighting system;

[0024] 110: laser light source;

[0025] 112: first laser light source;

[0026] 114: second laser light source;

[0027] 120, 120A: wavelength conversion element;

[0028] 130: first supplementary light source;

[0029] 140, 140A, 140B: light splitting element;

[0030] 150: light homogenizing element;

[0031] 160: Second supplementary light source;

[0032] 201, 202, 203, 301, 302: curves;

[0033] L1: excitation beam;

[0034] L11: first laser beam;

[0035] L12: second excitation beam;

[0036] L2: conversion beam;

[0037] L3: first supplementary beam;

[0038] L4: second supplementary beam;

[0039] LB: lighting beam;

[0040] LI: Image beam. DETAILED DESCRIPTION

[0041] The aforementioned technical contents, features, and functions of the present invention will be more clearly understood in the following detailed description of a preferred embodiment with reference to the accompanying drawings. Directional terms such as up, down, left, right, front, and back mentioned in the following embodiments are merely references to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present invention.

[0042] Figure 1 This is a schematic diagram of a projection device according to an embodiment of the present invention. Figure 1 This embodiment provides a projection device 10 comprising an illumination system 100, at least one light valve 60, and a projection lens 70. The illumination system 100 is configured to provide an illumination beam LB. The at least one light valve 60 is disposed in 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 in the transmission path of the image beam LI to project the image beam LI out of the projection device 10, thereby projecting an image onto a projection target (not shown), such as a screen, wall, or desktop.

[0043] The light valve 60 is, for example, a reflective light modulator such as a Liquid Crystal On Silicon (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-optical modulator, or an acousto-optic modulator (AOM). The present invention does not limit the type or type of light valve 60. The detailed steps and implementation of the method by which the light valve 60 converts the illumination beam LB into the image beam LI can be sufficiently taught, suggested, and explained by those skilled in the art, and thus will not be further described. In various embodiments, the number of light valves 60 may range from one to three, depending on the optical design of the illumination system 100.

[0044] The projection lens 70, for example, comprises a combination of one or more optical lenses having a refractive power, such as various combinations of non-planar lenses, such as a biconcave lens, a biconvex lens, a meniscus lens, a convex-concave lens, a plano-convex lens, and a plano-concave lens. In one embodiment, the projection lens 70 may also comprise a planar optical lens to reflect the image beam LI from the light valve 60 toward the projection target. The present invention is not limited to the type and form of the projection lens 70.

[0045] Figure 2 This is a schematic diagram of a lighting system according to an embodiment of the present invention. Figure 2 The lighting system 100 of this embodiment can be applied to at least Figure 1 The illumination system 100 includes a laser light source 110, a wavelength conversion element 120, a first supplemental light source 130, and a beam splitter 140. The laser light source 110 is configured to provide a laser beam L1 having a wavelength within a first wavelength range. For example, in this embodiment, the laser light source 110 is configured to be at least one blue laser diode or a blue laser diode array, configured to provide a blue laser beam L1 having a first wavelength range between 380 nanometers and 495 nanometers, with a primary wavelength of 455 nanometers.

[0046] The wavelength conversion element 120 is disposed in the transmission path of the laser beam L1. The wavelength conversion element 120 is used to convert the laser beam L1 into a converted beam L2. For example, in this embodiment, the wavelength conversion element 120 is a phosphor wheel. The wavelength conversion element 120 includes a rotating wheel and a wavelength conversion material. The wavelength conversion element 120 has a wavelength conversion region and a non-wavelength conversion region. The rotating wheel is used to carry the wavelength conversion material and rotate. The wavelength conversion material is disposed on the wavelength conversion region. The wavelength conversion element 120 is used to switch the wavelength conversion region and the non-wavelength conversion region into the transmission path of the laser beam L1 at different time intervals through rotation. The wavelength conversion material is, for example, a yellow and / or green phosphor material, which converts the blue laser beam L1 into a yellow and / or green converted beam L2. The converted beam L2 may include a green beam and a red beam, serving as the source of the red and green light components of the illumination beam LB. In this embodiment, the wavelength conversion element 120 includes, for example, a transparent element, such as glass. For example, in a first timing interval, the non-wavelength conversion region is located on the transmission path of the laser beam L1. After passing through the wavelength conversion element 120, the laser beam L1 is transmitted to the spectrometer 140. In a second timing interval, the wavelength conversion region is located on the transmission path of the laser beam L1. After the laser beam L1 is converted into the converted beam L2 by the wavelength conversion element 120, the converted beam L2 is transmitted to the spectrometer 140.

[0047] The first supplementary light source 130 is configured to provide a first supplementary light beam L3 having a wavelength within a second wavelength range. For example, the first supplementary light source 130 may be at least one red laser diode, at least one red light-emitting diode, a red laser diode array, or a red light-emitting diode array. The first supplementary light source 130 is configured to provide a red first supplementary light beam L3 having a second wavelength within a range of 600 to 670 nanometers, or alternatively, 620 to 660 nanometers. In another embodiment, the first supplementary light source 130 may be at least one green laser diode, at least one green light-emitting diode, a green laser diode array, or a green light-emitting diode array. The first supplementary light source 130 is configured to provide a green first supplementary light beam L3 having a second wavelength within a range of 500 to 560 nanometers, or alternatively, 515 to 535 nanometers. The polarization states of the first supplementary light beam L3 include a first polarization state and a second polarization state. In this embodiment, the polarization states are linear polarization states, with the first polarization state and the second polarization state being, for example, a P-linear polarization state and an S-linear polarization state, respectively. In this embodiment, the ratio of the energy of the first supplementary light beam L3 having the first polarization state to the energy of the first supplementary light beam L3 having the second polarization state provided by the first supplementary light source 130 is greater than 2 to 1. In one embodiment, the first supplementary light beam L3 has a single polarization (single polarity) characteristic, and most of the first supplementary light beam L3 is the first supplementary light beam L3 having the P linear polarization state. For example, the ratio of the energy of the first supplementary light beam L3 having the P linear polarization state to the energy of the first supplementary light beam L3 having the S linear polarization state is 97 to 3.

[0048] In this embodiment, the illumination system 100 further includes a light homogenizing element 150 disposed in the transmission path of the illumination beam LB. This element is used to adjust the shape of the light spot formed by the illumination beam LB on the light valve 60 so that the light spot shape of the illumination beam LB matches the shape of the working area of the light valve 60 (e.g., a rectangle). The light intensity of the light spot is consistent or similar across all locations, thereby uniformizing the light intensity of the illumination beam LB. The illumination beam LB includes at least one of the laser beam L1, the converted beam L2, and the first supplemental beam L3. In this embodiment, the light homogenizing element 150 is, for example, an integrating rod, a lens array (fly-eye lens), or other suitable optical element. In this embodiment, the transmission path of the first supplemental beam L3 from the first supplemental light source 130 to the beam splitter 140 does not include either a molded light-transmitting element or a reinforced light-transmitting element. Molded light-transmitting elements and reinforced light-transmitting elements can disrupt the polarization state of the light beam. The molded light-transmitting element is, for example, molded glass, and the reinforced light-transmitting element is, for example, reinforced glass. In this way, the polarization state of the first supplementary light beam L3 transmitted to the beam splitter 140 can be maintained.

[0049] Figure 3 for Figure 2 The reflectivity curve of the spectrometer element in the lighting system in different bands. Please also refer to Figure 2 and Figure 3 . Figure 3 A reflectivity of 1 in the image represents a reflectivity of 100%, a reflectivity of 0 represents a reflectivity of 0%, and so on. The spectrometer 140 is disposed on the transmission path of the excitation beam L1, the first supplementary beam L3, and the converted beam L2. The spectrometer 140 is, for example, a spectrometer with a coating on a transparent element, which is used to allow a specific wavelength beam with a specific polarization state to pass through or reflect it. In this embodiment, the spectrometer 140 is used to allow the laser beam L1 with a wavelength within the first wavelength range to pass through, to allow the first supplementary beam L3 with a wavelength within the second wavelength range and a first polarization state to pass through, and to reflect the converted beam L2 with a wavelength within the second wavelength range and a second polarization state. The polarization state of the converted beam L2 includes a first polarization state and a second polarization state, and the ratio of the energy of the converted beam L2 with the first polarization state to the energy of the converted beam L2 with the second polarization state is approximately 1:1. The transmittance of the first supplementary beam L3 with a wavelength within the second wavelength range and a first polarization state in the spectrometer 140 is greater than or equal to 70% or greater than or equal to 90%. In this embodiment, the spectrometer 140 is further configured to reflect the converted light beam L2 whose wavelength is not within the first wavelength range or the second wavelength range. For example, if the first supplementary light source 130 provides a red first supplementary light beam L3 with a second wavelength range between 600 and 670 nanometers, in this embodiment, the spectrometer 140 allows the blue laser beam L1 with a wavelength between 380 and 495 nanometers to pass through. The spectrometer 140 allows the red first supplementary light beam L3 with a wavelength between 600 and 670 nanometers and a P-linear polarization state to pass through, and reflects the converted light beam L2 (red light beam) with a wavelength between 600 and 670 nanometers and an S-linear polarization state. The spectrometer 140 is configured to reflect the green converted light beam L2 (green light beam) with a wavelength between 495 and 600 nanometers. The first supplementary light beam L3 (red light beam) with P polarization state, the laser light beam L1 (blue light beam), the converted light beam L2 (red light beam) with a wavelength between 600 nanometers and 670 nanometers and S polarization state, and the converted light beams L2 of other wavelength bands (for example, green light beam) from the spectrometer 140 will be transmitted to the light homogenizing element 150.

[0050] In this embodiment, the reflectivity of the light splitting element 140 for the first polarization state light beam falling in different wavelength ranges is different from the reflectivity of the light beam falling in the second polarization state falling in different wavelength ranges. The reflectivity of the first polarization state light beam falling in different wavelength ranges is shown in FIG. Figure 3 The curve 201 shows the reflectivity of the second polarization state light beam falling in different wavelength ranges. Figure 3The light intensity of the converted light beam L2 at different wavelengths is shown in the curve 202. Figure 3 Curve 203. Curve 201 and curve 202 overlap in the portion outside the second wavelength range (falling between 600 nanometers and 670 nanometers). Under the architecture of the lighting system 100 having the first supplementary light source 130, the spectroscopic element 140 of this embodiment can reflect the converted light beam L2 (red light beam) with a wavelength falling between 600 nanometers and 670 nanometers and having an S polarization state to the uniform light element 150. Compared with the spectroscopic element of the prior art that allows light beams with all polarization states falling between 600 nanometers and 670 nanometers to pass through, thereby causing all light loss in the said wavelength band, the spectroscopic element 140 of this embodiment has better light collection efficiency. Since the spectroscopic element 140 of this embodiment only considers the polarization state of the light beam with a wavelength falling within the second wavelength range, the coating process is simpler, and the slope of the curve 201 in the second wavelength range is higher, the light collection efficiency of the converted light beam L2 is higher, which can avoid the energy loss of part of the converted light beam L2 due to the multiple coating processes of the spectroscopic element, thereby improving the efficiency of light use to achieve a good optical effect.

[0051] Figure 4 This is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 4 . Figure 4 The architecture and advantages of the lighting system 100A are similar to Figure 2 The lighting system 100. The difference between the two is that, in this embodiment, the wavelength conversion element 120A is a reflective optical component, has a wavelength conversion area, and does not have a light-transmitting area. The laser light source 110 includes a first excitation light source 112 and a second excitation light source 114. The first excitation light source 112 is used to provide a first excitation light beam L11, and the wavelength conversion element 120A is arranged on the transmission path of the first laser beam L11. The second excitation light source 114 is used to provide a second excitation light beam L12, and the second excitation light beam L12 enters the uniform light element 150 through the spectroscopic element 140. The excitation beam L1 includes a first excitation light beam L11 and a second excitation light beam L12. For example, the first excitation light source 112 and the second excitation light source 114 are, for example, at least one blue laser diode or a blue laser diode array, for providing a blue first excitation light beam L11 and a second excitation light beam L12, the main wavelength of the first excitation light beam L11 is, for example, 455 nanometers, and the main wavelength of the second excitation light beam L12 is, for example, 465 nanometers. The second excitation light beam L12 is transmitted from the second excitation light source 114 through the beam splitter 140 and then to the light homogenizing element 150 to serve as the blue light portion of the illumination light beam LB.

[0052] Figure 5 FIG. 4 is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 6 for Figure 5The reflectivity curve of the spectrometer element in the lighting system in different bands. Please refer to Figure 5 and Figure 6 . Figure 5 The lighting system 100B is similar to Figure 2 The lighting system 100 and the lighting system 100B differ in that, in this embodiment, the lighting system 100B further includes a second supplementary light source 160 for providing a second supplementary light beam L4. The wavelength of the second supplementary light beam L4 is within a third wavelength range. The second supplementary light source 160 can be disposed on the side of the beam splitter 140A facing the first supplementary light source 130. The beam splitter 140A is located between the light homogenizing element 150 and the second supplementary light source 160. For example, the first supplementary light source 130 provides a red first supplementary light beam L3. The second supplementary light source 160 can be, for example, at least one green laser diode, at least one green light-emitting diode, a green laser diode array, or a green light-emitting diode array, and provides a green second supplementary light beam L4. The third wavelength range falls between 500 nanometers and 560 nanometers, or alternatively, between 515 nanometers and 535 nanometers. The second supplementary light beam L4 is transmitted from the second supplementary light source 160 through the beam splitter 140A and then to the light homogenizing element 150 to supplement the green portion of the illumination beam LB. The polarization states of the second supplemental light beam L4 include a first polarization state and a second polarization state. In this embodiment, the transmission path of the second supplemental light beam L4 from the second supplemental light source 160 to the beam splitter 140A does not include either a molded light-transmitting element or a reinforced light-transmitting element. This ensures that the polarization state of the second supplemental light beam L4 is maintained during transmission to the beam splitter 140A. In this embodiment, the ratio of the energy of the second supplemental light beam L4 having the first polarization state (P linear polarization state) to the energy of the second supplemental light beam L4 having the second polarization state (S linear polarization state) provided by the second supplemental light source 160 is greater than 2:1. In one embodiment, the second supplemental light beam L4 has a single polarization characteristic, with the majority of the second supplemental light beam L4 having the P linear polarization state. For example, the ratio of the energy of the second supplemental light beam L4 having the P linear polarization state to the energy of the second supplemental light beam L4 having the S linear polarization state is 97:3.

[0053] In this embodiment, a spectroscopic element 140A is disposed in the transmission paths of the excitation beam L1, the converted beam L2, the first supplementary beam L3, and the second supplementary beam L4, and is configured to respectively allow or reflect specific wavelength beams of different polarization states. The illumination beam LB includes at least one of the laser beam L1, the converted beam L2, the first supplementary beam L3, and the second supplementary beam L4. In this embodiment, the spectroscopic element 140A is configured to allow the laser beam L1 (blue beam) with a wavelength within the first wavelength range to pass through, to allow the first supplementary beam L3 (red beam) with a wavelength within the second wavelength range and a first polarization state to pass through, and to reflect the converted beam L2 (red beam) with a wavelength within the second wavelength range and a second polarization state. The spectroscopic element 140A is configured to allow the second supplementary beam L4 (green beam) with a wavelength within the third wavelength range and a first polarization state to pass through, and to reflect the converted beam L2 (green beam) with a wavelength within the third wavelength range and a second polarization state. The spectroscopic element 140A is also configured to reflect the converted beam L2 with a wavelength outside the first, second, and third wavelength ranges. For example, in this embodiment, the beam splitter 140A is configured to allow the laser beam L1 (blue beam) with a wavelength between 380 nm and 495 nm to pass through. The beam splitter 140A is configured to allow the first supplementary beam L3 (red beam) with a wavelength between 600 nm and 670 nm and a P-linear polarization state to pass through, and to reflect the converted beam L2 (red beam) with a wavelength between 600 nm and 670 nm and an S-linear polarization state. The beam splitter 140A is configured to allow the second supplementary beam L4 (green beam) with a wavelength between 500 nm and 560 nm and a P-linear polarization state to pass through, and to reflect the converted beam L2 (green beam) with a wavelength between 500 nm and 560 nm and an S-linear polarization state, and to reflect the converted beam L2 with a wavelength between 560 nm and 600 nm.

[0054] In this embodiment, the reflectivity of the light splitting element 140A for the first polarization state light beam falling in different wavelength ranges is different from the reflectivity of the light beam falling in different wavelength ranges. The reflectivity of the first polarization state light beam falling in different wavelength ranges is shown in FIG. Figure 6 The curve 301 shows the reflectivity of the second polarization state light beam falling in different wavelength ranges. Figure 6Curve 302. Curves 301 and 302 overlap outside the first wavelength range (between 380 nanometers and 495 nanometers), the second wavelength range (between 600 nanometers and 670 nanometers), and the third wavelength range (between 500 nanometers and 560 nanometers). In the illumination system 100B having the first supplemental light source 130 and the second supplemental light source 160, the beam splitter 140A of this embodiment can reflect the converted light beam L2 (red light beam) with a wavelength between 600 nanometers and 670 nanometers and an S-polarization state to the homogenizing element 150, and reflect the converted light beam L2 (green light beam) with a wavelength between 500 nanometers and 560 nanometers and an S-polarization state to the homogenizing element 150. Compared to conventional beam splitters that allow all polarization states of light beams between 500 nanometers and 560 nanometers and 600 nanometers to pass through, resulting in complete light loss in these wavelength bands, the beam splitter 140A of this embodiment has better light collection efficiency. Since the spectrometer 140A of this embodiment only considers the polarization state of the light beam with a wavelength falling within the second wavelength range and the third wavelength range, the coating process is relatively simple, and the slope of the curve 301 in the second wavelength range and the third wavelength range is relatively high. The light collection efficiency of the converted light beam L2 is relatively high. In the architecture of the lighting system 100B with a supplementary light source, the energy loss of part of the converted light beam L2 caused by the multiple coating processes of the spectrometer can be avoided, thereby improving the utilization efficiency of light to achieve a good optical effect.

[0055] Figure 7 This is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 7 . Figure 7 The architecture and advantages of the lighting system 100C are similar to Figure 5The lighting system 100B. The difference between the two is that, in this embodiment, the wavelength conversion element 120A is a reflective optical component, has a wavelength conversion area, and does not have a light-transmitting area. The laser light source 110 includes a first excitation light source 112 and a second excitation light source 114. The first excitation light source 112 is used to provide a first excitation light beam L11, and the wavelength conversion element 120A is arranged on the transmission path of the first laser beam L11. The second excitation light source 114 is used to provide a second excitation light beam L12, and the second excitation light beam L12 enters the uniform light element 150 through the spectroscopic element 140A. The excitation beam L1 includes a first excitation light beam L11 and a second excitation light beam L12. For example, the first excitation light source 112 and the second excitation light source 114 are, for example, at least one blue laser diode or a blue laser diode array, for providing a blue first excitation light beam L11 and a second excitation light beam L12, the main wavelength of the first excitation light beam L11 is, for example, 455 nanometers, and the main wavelength of the second excitation light beam L12 is, for example, 465 nanometers. The second excitation light beam L12 is transmitted from the second excitation light source 114 through the beam splitter 140A to the light homogenizing element 150 to serve as the blue light portion of the illumination light beam LB.

[0056] Figure 8 FIG. 4 is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 9 for Figure 8 The reflectivity curve of the spectrometer element in the lighting system in different bands. Please refer to Figure 8 and Figure 9 . Figure 8 The lighting system of 100D is similar to Figure 7The difference between the two is that, in this embodiment, the combination of the first supplementary light source 130, the second supplementary light source 160 and the second excitation light source 114 is exchanged with the wavelength conversion element 120A. The spectroscopic element 140B is located between the wavelength conversion element 120A and the light homogenizing element 150, and is also located between the first excitation light source 112 and the second supplementary light source 160. In this embodiment, the spectroscopic element 140B is used to reflect the laser beam L1 (blue beam) with a wavelength within the first wavelength range, to reflect the first supplementary light beam L1 (red beam) with a wavelength within the second wavelength range and a second polarization state, and to allow the conversion light beam L2 (red beam) with a wavelength within the second wavelength range and a first polarization state to pass through. The spectroscopic element 140B is also used to reflect the second supplementary light beam L4 (green beam) with a wavelength within the third wavelength range and a second polarization state, and to allow the conversion light beam L2 (green beam) with a wavelength within the third wavelength range and a first polarization state to pass through. In this embodiment, the ratio of the energy of the first supplementary light beam L3 having the first polarization state (P linear polarization state) provided by the first supplementary light source 130 to the energy of the first supplementary light beam L1 having the second polarization state (S linear polarization state) is less than 1:2, and the ratio of the energy of the second supplementary light beam L4 having the first polarization state (P linear polarization state) provided by the second supplementary light source 160 to the energy of the first supplementary light beam L1 having the second polarization state (S linear polarization state) is less than 1:2. In one embodiment, the first supplementary light beam L1 and the second supplementary light beam L4 have single polarization characteristics, and most of the first supplementary light beam L1 and the second supplementary light beam L4 are beams having the S linear polarization state. For example, the ratio of the energy of the first supplementary light beam L1 having the S linear polarization state to the energy of the first supplementary light beam L1 having the P linear polarization state is 97:3, and the ratio of the energy of the second supplementary light beam L4 having the S linear polarization state to the energy of the second supplementary light beam L4 having the P linear polarization state is 97:3.

[0057] For example, in this embodiment, the spectrometer 140B is used to reflect the blue laser beam L1 (blue beam) with a wavelength falling between 380 nanometers and 495 nanometers. The spectrometer 140B is used to reflect the red first supplementary beam L3 (red beam) with a wavelength falling between 600 nanometers and 670 nanometers and having an S-linear polarization state, and to reflect the green second supplementary beam L4 (green beam) with a wavelength falling between 500 nanometers and 560 nanometers and having an S-linear polarization state. The spectrometer 140B is used to allow the conversion beam L2 (green beam and red beam) with a wavelength falling outside 380 nanometers to 495 nanometers and having a P-linear polarization state to pass through. In other words, in this embodiment, the reflectivity of the spectrometer 140B for the first polarization state beam falling in different wavelength ranges is different from the reflectivity for the second polarization state beam falling in different wavelength ranges. The reflectivity for the first polarization state beam falling in different wavelength ranges is shown in FIG. Figure 9 The curve 401 shows the reflectivity of the second polarization state light beam falling in different wavelength ranges. Figure 9 The curve 401 overlaps with the curve 402 in a portion outside the second wavelength range (between 600 nm and 670 nm) and the third wavelength range (between 500 nm and 560 nm).

[0058] In the illumination system 100D having a first supplemental light source 130 and a second supplemental light source 160, the beam splitter 140B of this embodiment allows the converted light beam L2 (green light beam) with a wavelength between 500 nanometers and 560 nanometers and a P-polarization state, and the converted light beam L2 (red light beam) with a wavelength between 600 nanometers and 670 nanometers and a P-polarization state to pass through to the light homogenizing element 150. The beam splitter 140B is also configured to allow the converted light beam L2 with a wavelength outside the first wavelength range, the second wavelength range, and the third wavelength range to pass through. For example, the beam splitter 140B is configured to allow the converted light beam L2 with a wavelength between 540 nanometers and 630 nanometers to pass through. Compared to conventional beam splitters that reflect light beams of all polarization states within the wavelength range of 500 nanometers to 670 nanometers, resulting in the loss of all light in that wavelength band, the beam splitter 140B of this embodiment has better light collection efficiency. Since the spectrometer 140B of this embodiment only considers the polarization state of the light beam with a wavelength falling within the second wavelength range and the third wavelength range, the coating process is relatively simple, and the slope of the curve 402 in the second wavelength range and the third wavelength range is relatively high. The light collection efficiency of the converted light beam L2 is relatively high. In the architecture of the lighting system 100D with a supplementary light source, the energy loss of part of the converted light beam L2 caused by the multiple coating processes of the spectrometer can be avoided, thereby improving the utilization efficiency of light to achieve a good optical effect.

[0059] In summary, in the illumination system and projection device with a supplemental light source according to the present invention, the design of the beam splitter element allows the light beam in the wavelength band corresponding to the supplemental light source to pass through the beam splitter element in the first polarization state and be reflected by the beam splitter element in the second polarization state. This improves light utilization efficiency and achieves a good optical effect.

[0060] However, what is described above is only a preferred embodiment of the present invention, and it should not be used to limit the scope of implementation of the present invention. That is, all simple equivalent changes and modifications made in accordance with the claims and the content of the 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 to 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, characterized in that: The illumination system includes a laser light source, a wavelength conversion element, a first supplementary light source, and a light splitting element, wherein: The laser light source is used to provide a laser beam, and the wavelength of the laser beam is within a first wavelength range; The wavelength conversion element is disposed on a transmission path of the laser beam, and the wavelength conversion element is used to convert the laser beam into a converted beam; The first supplementary light source is used to provide a first supplementary light beam, the wavelength of the first supplementary light beam is within a second wavelength range, and the polarization state of the first supplementary light beam includes a first polarization state and a second polarization state; and The beam splitter is disposed on the transmission paths of the excitation beam, the first supplementary beam, and the converted beam, and the beam splitter meets one of the following conditions: (1) for allowing the laser beam having a wavelength within the first wavelength range to pass through, for allowing the first supplementary beam having a wavelength within the second wavelength range and having the first polarization state to pass through, and for reflecting the converted beam having a wavelength within the second wavelength range and having the second polarization state; or (2) for reflecting the laser beam having a wavelength within the first wavelength range, for reflecting the first supplementary beam having a wavelength within the second wavelength range and having the second polarization state, and for allowing the converted beam having a wavelength within the second wavelength range and having the first polarization state to pass through.

2. The lighting system according to claim 1, wherein The first wavelength range falls between 380 nanometers and 495 nanometers, and the second wavelength range falls between 500 nanometers and 560 nanometers or between 600 nanometers and 670 nanometers.

3. The lighting system according to claim 1, wherein When the spectroscopic element meets condition (1), the spectroscopic element is also used to reflect the converted light beam whose wavelength is not within the first wavelength range and the second wavelength range; when the spectroscopic element meets condition (2), the spectroscopic element is also used to allow the converted light beam whose wavelength is not within the first wavelength range and the second wavelength range to pass.

4. The lighting system according to claim 1, wherein When the spectroscopic element meets condition (1), the ratio of the energy of the first supplementary light beam with the first polarization state provided by the first supplementary light source to the energy of the first supplementary light beam with the second polarization state is greater than 2 to 1; when the spectroscopic element meets condition (2), the ratio of the energy of the first supplementary light beam with the first polarization state provided by the first supplementary light source to the energy of the first supplementary light beam with the second polarization state is less than 1 to 2.

5. The lighting system according to claim 1, wherein The transmission path of the first supplementary light beam from the first supplementary light source to the beam splitter element does not include a molded light-transmitting element and a reinforced light-transmitting element.

6. The lighting system according to claim 1, wherein The transmittance of the beam splitter element to the light beam with a wavelength within the second wavelength range and the first polarization state is greater than or equal to 70%.

7. The lighting system according to claim 1, wherein The lighting system also includes a second supplementary light source for providing a second supplementary light beam, wherein the wavelength of the second supplementary light beam is within a third wavelength range, and the polarization state of the second supplementary light beam includes a first polarization state and a second polarization state, wherein the spectroscopic element is further configured to allow the light beam with a wavelength within the third wavelength range and having the first polarization state to pass through, and to reflect the light beam with a wavelength within the third wavelength range and having the second polarization state.

8. The lighting system according to claim 7, characterized in that The first wavelength range falls between 380 nm and 495 nm, the second wavelength range falls between 600 nm and 670 nm, and the third wavelength range falls between 500 nm and 560 nm.

9. The lighting system according to claim 7, characterized in that The transmission path of the second supplementary light beam from the second supplementary light source to the beam splitter element does not include a molded light-transmitting element and a reinforced light-transmitting element.

10. The lighting system according to claim 1, wherein The laser light source includes a first excitation light source and a second excitation light source. The first excitation light source is used to provide a first excitation light beam. The wavelength conversion element is configured on the transmission path of the first laser light beam. The second excitation light source is used to provide a second excitation light beam. The second excitation light beam enters the light homogenizing element through the spectroscopic element.

11. A projection device, characterized in that: The projection device includes an illumination system, at least one light valve, and a projection lens, wherein: The illumination system is used to provide an illumination beam, and the illumination system includes a laser light source, a wavelength conversion element, a first supplementary light source, and a beam splitter element, wherein: The laser light source is used to provide a laser beam, and the wavelength of the laser beam is within a first wavelength range; The wavelength conversion element is disposed on a transmission path of the laser beam, and the wavelength conversion element is used to convert the laser beam into a converted beam; The first supplementary light source is used to provide a first supplementary light beam, the wavelength of the first supplementary light beam is within a second wavelength range, and the polarization state of the first supplementary light beam includes a first polarization state and a second polarization state; and The spectroscopic element is disposed on a transmission path of the excitation beam, the first supplementary beam, and the converted beam, the illumination beam includes at least one of the excitation beam, the first supplementary beam, and the converted beam, and the spectroscopic element meets one of the following conditions: (1) for allowing the laser beam having a wavelength within the first wavelength range to pass through, for allowing the beam having a wavelength within the second wavelength range and having the first polarization state to pass through, and for reflecting the converted beam having a wavelength within the second wavelength range and having the second polarization state; or (2) for reflecting the laser beam having a wavelength within the first wavelength range, for reflecting the first supplementary beam having a wavelength within the second wavelength range and having the second polarization state, and for allowing the converted beam having a wavelength within the second wavelength range and having the first polarization state to pass; The at least one light valve is disposed on the transmission path of the illumination light beam, and is used to convert the illumination light beam into an image light beam; and The projection lens is disposed on the transmission path of the image light beam and is used to project the image light beam out of the projection device.

12. The projection device according to claim 11, wherein: The first wavelength range falls between 380 nanometers and 495 nanometers, and the second wavelength range falls between 500 nanometers and 560 nanometers or between 600 nanometers and 670 nanometers.

13. The projection device according to claim 11, wherein: When the spectroscopic element meets condition (1), the spectroscopic element is also used to reflect the converted light beam whose wavelength is not within the first wavelength range and the second wavelength range; when the spectroscopic element meets condition (2), the spectroscopic element is also used to allow the converted light beam whose wavelength is not within the first wavelength range and the second wavelength range to pass.

14. The projection device according to claim 11, wherein: When the spectroscopic element meets condition (1), the ratio of the energy of the first supplementary light beam with the first polarization state provided by the first supplementary light source to the energy of the first supplementary light beam with the second polarization state is greater than 2 to 1; when the spectroscopic element meets condition (2), the ratio of the energy of the first supplementary light beam with the first polarization state provided by the first supplementary light source to the energy of the first supplementary light beam with the second polarization state is less than 1 to 2.

15. The projection device according to claim 11, wherein: The transmission path of the first supplementary light beam from the first supplementary light source to the beam splitter element does not include a molded light-transmitting element and a reinforced light-transmitting element.

16. The projection device according to claim 11, wherein: The transmittance of the beam splitter element to the light beam with a wavelength within the second wavelength range and the first polarization state is greater than or equal to 70%.

17. The projection device according to claim 11, wherein: The lighting system also includes a second supplementary light source for providing a second supplementary light beam, wherein the wavelength of the second supplementary light beam is within a third wavelength range, and the polarization state of the second supplementary light beam includes a first polarization state and a second polarization state, wherein the spectroscopic element is further configured to allow the light beam with a wavelength within the third wavelength range and having the first polarization state to pass through, and to reflect the light beam with a wavelength within the third wavelength range and having the second polarization state.

18. The projection device according to claim 17, wherein: The first wavelength range falls between 380 nm and 495 nm, the second wavelength range falls between 600 nm and 670 nm, and the third wavelength range falls between 500 nm and 560 nm.

19. The projection device according to claim 17, wherein: The transmission path of the second supplementary light beam from the second supplementary light source to the beam splitter element does not include a molded light-transmitting element and a reinforced light-transmitting element.

20. The projection device according to claim 11, wherein: The laser light source includes a first excitation light source and a second excitation light source. The first excitation light source is used to provide a first excitation light beam. The wavelength conversion element is configured on the transmission path of the first laser light beam. The second excitation light source is used to provide a second excitation light beam. The second excitation light beam enters the light homogenizing element through the spectroscopic element.

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