Lighting system and projection equipment

Abstract

The application provides a lighting system, which comprises a first light source device, a second light source device, a light guide device and a light splitting device. The first light source device provides a first light beam, a second light beam, a third light beam and a first compensation light beam. The first light beam and the first compensation light beam have the same color, the color of the first light beam is different from that of the second light beam, and the color of the first light beam is different from that of the third light beam. The second light source device provides at least one red light beam. A first reflecting element of the light guide device comprises a first part and a second part. The first part reflects the first light beam and the first compensation light beam. The second part allows the at least one red light beam provided by the second light source device to pass through. The light splitting device comprises a first half-reflecting element, which reflects a part of the second light beam and allows another part of the second light beam to pass through. The second part of the first reflecting element of the light guide device reflects the other part of the second light beam. In this way, the uniformity of the light beam transmitted to the light uniformizing element can be improved, and thus the projection picture of the projection device has good optical effect.

Description

[0001] This application is a divisional application of the invention patent application with the application date of March 12, 2020, application number 202010170060.3, and invention name “Lighting system and projection device”. Technical Field

[0002] The present invention relates to an optical system and a display device, and more particularly to an illumination system and a projection device. Background Art

[0003] Projection devices are used to produce large-scale displays, and they continue to advance with the evolution and innovation of technology. The imaging principle of a projection device is to convert the illumination beam generated by an illumination system into an image beam using a light valve. This image beam is then projected through a projection lens onto a target object (e.g., a screen or wall) to form the projected image. To achieve sufficient color uniformity, existing pure laser projectors typically utilize an optical path design that directs the laser beams provided by the three primary colors of red, green, and blue laser light onto the same optical path. The beams are then transmitted to a light homogenizer and modulated into an image beam by a light modulator.

[0004] Existing red, green, and blue lasers primarily use single-color laser modules. These utilize three separate sets of red, green, and blue laser modules. This simplifies optical design by directing each color of light along the same optical path. Simply configuring the laser's emission direction and combining several optical splitters and combiners allows the beams to be transmitted to subsequent optical components with complete overlap. However, using three sets of laser modules occupies excessive space. To reduce the overall size of the optical machine, recent developments favor the use of multi-color laser modules. However, this can lead to poor color uniformity.

[0005] The "Background" section is intended only to facilitate understanding of the present invention. Therefore, the information disclosed in this section may contain information that does not constitute prior art 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

[0006] The present invention provides a projection device and an illumination device, which can improve the uniformity of a transmitted light beam.

[0007] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0008] To achieve one, some, or all of the above objectives, or other objectives, the present invention provides an illumination system comprising a first light source device, a second light source device, a light guide device, and a light splitting device. The first light source device is configured to provide a first light beam, a second light beam, a third light beam, and a first compensation light beam. The color of the first light beam is the same as the color of the first compensation light beam. The color of the first light beam is different from the color of the second light beam. The color of the first light beam is different from the color of the third light beam. The second light source device is configured to provide at least one red light beam. A first reflective element in the light guide device comprises a first portion and a second portion. The first portion reflects the first light beam and the first compensation light beam. The second portion allows the at least one red light beam provided by the second light source device to pass through. The light splitting device comprises a first semi-reflective element, the first semi-reflective element reflecting a portion of the second light beam and allowing another portion of the second light beam to pass through. The second portion of the first reflective element in the light guide device further reflects another portion of the second light beam. The second light source device is configured to provide a fourth light beam and a fifth light beam, and the at least one red light beam provided by the second light source device comprises the second compensation light beam and the third compensation light beam. The first portion of the first reflective element allows the fourth light beam and the fifth light beam to pass through. The second portion of the first reflective element allows the second compensation light beam and the third compensation light beam to pass through.

[0009] To achieve one, some, or all of the above objectives, or other objectives, the present invention further provides an illumination system comprising a first light source device, a second light source device, a light guide device, and a light splitting device. The first light source device is configured to provide a first light beam, a second light beam, a third light beam, and a first compensation light beam. The color of the first light beam is the same as the color of the first compensation light beam. The color of the first light beam is different from the color of the second light beam. The color of the first light beam is different from the color of the third light beam. The second light source device is configured to provide a red light beam and at least one compensation light beam. The first reflective element in the light guide device comprises a first portion and a second portion, the first portion reflecting the first light beam and the first compensation light beam, while the second portion allows the red light beam and the at least one compensation light beam provided by the second light source device to pass through. The light splitting device comprises a first semi-reflective element, the first semi-reflective element reflecting a portion of the second light beam and allowing another portion of the second light beam to pass through. The second portion of the first reflective element in the light guide device further reflects another portion of the second light beam. The second light source device is configured to provide a fourth light beam and a fifth light beam, the fourth light beam having a different color from the second light beam. The first portion of the first reflective element allows the fourth light beam and the fifth light beam to pass through.

[0010] Based on the above, embodiments of the present application have at least one of the following advantages or effects. In the illumination system of the present application, the illumination system transmits the light beams provided by the first light source device to the light splitting device through the configuration of different optical elements in the light guide device, and generates the first combined light beam and the second combined light beam through the light splitting device. In this way, the uniformity of the light beams transmitted to the light uniformization element can be improved, and the projection screen of the projection device has good optical effect.

[0011] In order to make the above features and advantages of the present application more apparent, the following embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 A schematic diagram of a projection device according to an embodiment of the present application.

[0013] Figure 2 A schematic diagram of an illumination system according to an embodiment of the present application.

[0014] Figure 3 A schematic diagram of an illumination system according to an embodiment of the present application. Figure 1 A schematic diagram of a light uniformization element receiving light beams in the illumination system.

[0015] Figure 4 A schematic diagram of an illumination system according to another embodiment of the present application.

[0016] Figure 5 A schematic diagram of an illumination system according to another embodiment of the present application.

[0017] 6A to 6D A schematic diagram of an illumination system according to another embodiment of the present application.

[0018] 7A to 7D A schematic diagram of an illumination system according to another embodiment of the present application.

[0019] Figures 8A to 8D A schematic diagram of an illumination system according to another embodiment of the present application.

[0020] 9A to 9D A schematic diagram of an illumination system according to another embodiment of the present application.

[0021] Figure 10 A schematic diagram of an illumination system according to another embodiment of the present application.

[0022] Figure 11 A schematic diagram of an illumination system according to another embodiment of the present application.

[0023] LIST OF REFERENCE NUMBERS

[0024] 10: projection device

[0025] 60: Light valve

[0026] 70: Projection lens 100, 100A, 100B, 100C, 100D, 100E, 100F, 100G, 100H: Illumination system 110: First light source device

[0027] 111: First laser light source

[0028] 112: Second laser light source

[0029] 113: The third laser light source

[0030] 115: First compensation laser light source

[0031] 120, 120A, 120B: Light guide device

[0032] 122, 122A, 122B: first reflective element

[0033] 124, 124B: First spectroscopic element

[0034] 126: Second beam splitter

[0035] 128: Second semi-reflective element

[0036] 130,130A:Spectrometer

[0037] 132, 132A: First semi-reflective element

[0038] 134: Second reflective element

[0039] 136: third semi-reflective element

[0040] 140: Focusing element

[0041] 150: light uniformity element

[0042] 160: Second light source device

[0043] 161: Fourth laser light source

[0044] 162: Fifth laser light source

[0045] 165: Second compensation laser light source

[0046] 166: Third compensation laser light source

[0047] A:Center axis

[0048] B1: Part 1

[0049] B2: Part 2

[0050] D: Distance

[0051] L1: first beam L2 second beam L3 third beam

[0052] L4: The fourth beam

[0053] L5: The fifth beam

[0054] LA1: First compensation beam

[0055] LA2: Second compensation beam

[0056] LA3: The third compensation beam

[0057] LB: Lighting beam

[0058] LC1: First composite beam

[0059] LC2: Second composite beam

[0060] LI: Image beam

[0061] P: Light spot. DETAILED DESCRIPTION

[0062] The foregoing and other technical aspects, features, and benefits 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, used 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.

[0063] 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 and is configured to project the image beam LI out of the projection device 10 onto a projection target (not shown), such as a screen or wall.

[0064] 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 is not limited to 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 this embodiment, there is only one light valve 60, for example, in a projection device 10 using a single digital micro-mirror device. However, in other embodiments, there may be multiple light valves, and the present invention is not limited thereto.

[0065] 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.

[0066] Figure 2 This is a schematic diagram of a lighting system according to an embodiment of the present invention. Figure 2 . Figure 2 The lighting system 100 shown is applicable to at least Figure 1 In the projection device 10 shown. In this embodiment, the illumination system 100 includes a first light source device 110, a light guide device 120, a light splitter device 130, and a light focusing element 140. Specifically, the illumination system 100 in this embodiment also includes a light homogenizing element 150. In this embodiment, the light beam emitted by the first light source device 110 is transmitted to the light splitter device 130 via the light guide device 120. The light beam is then transmitted to the light focusing element 140 by the light splitting effect of the light splitter device 130. The light beam then passes through the light focusing element 140 and is then transmitted to the light homogenizing element 150.

[0067] The first light source device 110 is used to provide a first light beam L1, a second light beam L2, a third light beam L3, and a first compensation light beam LA1. Specifically, in this embodiment, the first light source device 110 includes a first laser source 111, a second laser source 112, a third laser source 113, and a first compensation light beam 115. The first laser source 111 is used to provide the first light beam L1, the second laser source 112 is used to provide the second light beam L2, the third laser source 113 is used to provide the third light beam L3, and the first compensation light beam 115 is used to provide the first compensation light beam LA1. In this embodiment, the first laser source 111 is a red laser diode, the second laser source 112 is a blue laser diode, the third laser source 113 is a green laser diode, and the first compensation light beam 115 is a red laser diode, but the present invention is not limited to this. Therefore, the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam LA1 are red, blue, green, and red, respectively. The main wavelengths of the first beam L1 and the first compensation beam LA1 can be similar or the same. In one embodiment, the first laser light source 111 and the first compensation laser light source 115 in the first light source device 110 can be interchanged, but the present invention is not limited thereto.

[0068] The light guide device 120 is used to reflect the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam LA14. Specifically, in this embodiment, the light guide device 120 includes a first reflective element 122, a first beam splitter 124, and a second beam splitter 126. The first reflective element 122 is used to reflect the first light beam L1 and the first compensation light beam LA1. The first beam splitter 124 is used to reflect the second light beam L2 while allowing the first light beam L1 and the first compensation light beam LA1 to pass through. The second beam splitter 126 is used to reflect the third light beam L3 while allowing the first light beam L1, the first compensation light beam LA1, and the second light beam L2 to pass through. A beam splitter (Dichroic Mirror) is used to reflect light beams within a specific wavelength range while allowing light beams within another wavelength range to pass through.

[0069] In other words, in this embodiment, the first reflective element 122 is, for example, a red-reflecting mirror (MR) or a general reflective mirror, the first beam splitter 124 is, for example, a blue-reflecting beam splitter (DMB), and the second beam splitter 126 is, for example, a green-reflecting beam splitter (DMG). Therefore, the first light beam L1 and the first compensation light beam LA1 are reflected by the first reflective element 122 and sequentially pass through the first beam splitter 124 and the second beam splitter 126. The second light beam L2 is reflected by the first beam splitter 124 and passes through the second beam splitter 126. The third light beam L3 is reflected by the second beam splitter 126.

[0070] The beam splitter 130 is used to split the light beams and transmit them to the focusing element 140. Specifically, in this embodiment, the beam splitter 130 includes a first semi-reflective element 132 and a second reflective element 134. The first semi-reflective element 132 is disposed between the light guide 120 and the second reflective element 134. The first semi-reflective element 132 is used to reflect a portion of the second light beam L2 and a portion of the third light beam L3, while allowing another portion of the second light beam L2 and the third light beam L3 to pass through. In this embodiment, the first semi-reflective element 132 is also used to reflect a portion of the first light beam L1 and a portion of the first compensation light beam LA1, while allowing another portion of the first light beam L1 and the first compensation light beam LA1 to pass through. For example, in this embodiment, the first semi-reflective element 132 is a half mirror (HM), which allows 50 percent of the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam LA1 to pass through, and reflects the remaining 50 percent of the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation light beam LA1. The second reflective element 134 is, for example, a reflective mirror, configured to reflect the first light beam L1 , the second light beam L2 , the third light beam L3 and the first compensation light beam LA1 passing through the first semi-reflective element 132 .

[0071] Figure 3 for Figure 1 Schematic diagram of the light beam received by the focusing element in the lighting system. Please also refer to Figure 2 and Figure 3The focusing element 140 is used to receive the first composite beam LC1 and the second composite beam LC2 formed by the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation beam L1 from the light guide device 120 or the light splitting device 130. Specifically, 50 percent of the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation beam LA1 are reflected by the first semi-reflective element 132 to form the first composite beam LC1, while the remaining 50 percent of the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation beam LA1 are reflected by the second reflective element 134 to form the second composite beam LC2. The light spots P formed by the first composite beam LC1 and the second composite beam LC2 respectively irradiated on the focusing element 140 have the same distance D from the central axis A of the focusing element 140 and are both greater than zero. When the first laser light source 111 and the first compensation laser light source 115 are interchanged, the same first composite beam LC1 and second composite beam LC2 can also be formed. In other words, the same effect can be achieved even when the settings are interchanged. The focusing element 140 is, for example, a combination of one or more optical lenses with refractive power, 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, but the present invention is not limited thereto.

[0072] The light homogenizing element 150 is disposed on the transmission path of the first composite light beam LC1 and the second composite light beam LC2. The light homogenizing element 150 is disposed on the transmission path of the light beam and is used to adjust the spot shape and uniformity of the light beam so that the spot shape of the light beam can match the light valve 60 (such as Figure 1 ) of the working area (e.g., rectangular), and make the light intensity of each spot consistent or close, and the light intensity of the light beam uniform. In this embodiment, the light homogenizing element 150 is, for example, an integrating rod. However, in other embodiments, the light homogenizing element 150 can also be other appropriate types of optical elements, such as a lens array (fly eye lens, fly eye lens array), and the present invention is not limited thereto. In this embodiment, the light homogenizing element 150 is used to transform the first composite light beam LC1 and the second composite light beam LC2 into an illumination light beam LB (e.g., Figure 1 ).

[0073] Therefore, the lighting system 100 of this embodiment can form the multiple light beams provided by the first light source device 110 into a first composite light beam LC1 and a second composite light beam LC2 respectively through the configuration of the light guide device 120 and the light splitting device 130, and transmit them through the focusing element 140 in an off-axis manner to improve the uniformity of the light beams transmitted to the light homogenizing element 150, so that the projection image of the projection device 10 has a good optical effect.

[0074] Figure 4 This is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 4 The lighting system 100A of this embodiment is similar to Figure 2 The lighting system 100 shown is different in that, in this embodiment, the first light source device 110 is configured as follows: Figure 2 The first light source device 110 is inverted. Figure 4 As shown, the first light source device 110 includes, from right to left, a third laser light source 113, a second laser light source 112, a first laser light source 111, and a first compensation laser light source 115. The first semi-reflective element 132 in the beam splitter 130 is configured to reflect a portion of the second light beam L2 and a portion of the third light beam L3, while allowing the remaining portions of the second and third light beams L2 and L3 to pass through. The second reflective element 134 is configured to reflect the first light beam L1, the second light beam L2, the third light beam L3, and the first compensation beam LA1 that have passed through the first semi-reflective element 132.

[0075] In other words, in this embodiment, the first reflective element 122 is, for example, a green-reflecting mirror (MG), the first beam splitter 124 is, for example, a blue-reflecting beam splitter, and the second beam splitter 126 is, for example, a red-reflecting beam splitter (DMR). Therefore, the illumination system 100A of this embodiment can transmit the multiple light beams provided by the first light source device 110 to the beam splitter 130 by configuring different light guide devices 120. This improves the uniformity of the light beams transmitted to the light homogenizing element 150, thereby ensuring that the projection image of the projection device 100A has a good optical effect.

[0076] Figure 5 This is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 5 The lighting system 100B of this embodiment is similar to Figure 2 The difference between the two is that, in this embodiment, the first light source device 110 is arranged parallel to the optical axis of the light homogenizing element 150. Figure 5 As shown, the first light source device 110 comprises, from top to bottom, a first compensation laser light source 115, a first laser light source 111, a second laser light source 112, and a third laser light source 113. In other embodiments, the positions of the first compensation laser light source 115 and the first laser light source 111 can be swapped.

[0077] In this embodiment, the first beam splitter 124 of the light guide device 120 is configured to reflect the second and third beams L2 and L3, while allowing the first beam L1 and the first compensation beam LA1 to pass through. In other words, in this embodiment, the first beam splitter 124 is, for example, a dichroic mirror with blue and green reflection (DMBG). Furthermore, in this embodiment, the first semi-reflective element 132 of the beam splitter 130 is configured to reflect a portion of the second and third beams L2 and L3, while allowing another portion of the second and third beams L2 and L3 to pass through. Furthermore, the first semi-reflective element 132 is configured to allow the first beam L1 and the first compensation beam LA1 to pass through. In other words, in this embodiment, the first semi-reflective element 132 is, for example, a half mirror with green and blue (HMGB). This improves the uniformity of the light beam transmitted to the light homogenizing element 150, thereby enhancing the optical quality of the projection image of the projection device 100B.

[0078] 6A to 6D Each of them is a schematic diagram showing different light beams of an illumination system according to another embodiment of the present invention. 6A to 6D The lighting system 100C of this embodiment is similar to Figure 2 The illumination system 100 shown in FIG. The difference between the two is that, in this embodiment, the first beam splitter 124 in the light guide 120 is used to reflect the second light beam L2 and the third light beam L3 while allowing the first light beam L1 and the first compensation beam LA1 to pass through. Furthermore, the first semi-reflective element 132 in the beam splitter 130 is used to reflect a portion of the second light beam L2 and a portion of the third light beam L3 while allowing the other portions of the second light beam L2 and the third light beam L3 to pass through.

[0079] In other words, in this embodiment, the first beam splitter element 124 is, for example, a reflective blue-green beam splitter, and the first semi-reflective element 132 is, for example, a blue-green semi-reflective mirror. Figure 6B Only the transmission paths of the first light beam L1 and the first compensation light beam LA1 are shown. Figure 6C Only the transmission path of the third light beam L3 is shown. Figure 6D Only the transmission path of the second light beam L2 is shown. In this way, the uniformity of the light beam can be improved, thereby making the projection image of the projection device 100C have a good optical effect.

[0080] 7A to 7D Each of them is a schematic diagram showing different light beams of an illumination system according to another embodiment of the present invention. 7A to 7D The lighting system 100D of this embodiment is similar to Figure 6AThe displayed illumination system 100C. The difference between the two is that in the present embodiment, the light guide device 120 further comprises a second half-reflective element 128 for reflecting a portion of the first light beam L1 and a portion of the first compensation light beam LA1 and letting another portion of the first light beam L1 and the first compensation light beam LA1 pass through. In addition, the light splitting device 130 further comprises a third half-reflective element 136, wherein the first half-reflective element 132 is for reflecting a portion of the second light beam L2 and letting another portion of the second light beam L2 pass through, and the third half-reflective element 136 is for reflecting a portion of the third light beam L3 and letting another portion of the third light beam L3 pass through.

[0081] In other words, in the present embodiment, the first reflective element 122 is for example a mirror, the first light splitting element 124 is for example a blue-green light reflecting dichroic mirror, and the second half-reflective element 128 is for example a half-mirror. The first light splitting element 124 and the second half-reflective element 128 are for example formed as a single optical element by means of gluing, or are formed on a single optical element (for example a glass sheet or a plastic sheet) by means of coating, but are not limited thereto.

[0082] The first half-reflective element 132 is for example a blue light half-mirror (Half Mirror with Blue, HMB), and the third half-reflective element 136 is for example a green light half-mirror (Half Mirror with Green, HMG). For the convenience of display, Figure 7B Only the transmission path of the first light beam L1 and the first compensation light beam LA1 is shown, Figure 7C Only the transmission path of the third light beam L3 is shown, and Figure 7D Only the transmission path of the second light beam L2 is shown. In this way, the beam uniformity can be improved, and thus the projection picture of the projection device 100C has good optical effects.

[0083] Figures 8A to 8D are schematic diagrams of an illumination system according to another embodiment of the present application for displaying different light beams. Please refer to Figures 8A to 8D The illumination system 100E of the present embodiment is similar to Figure 6AThe lighting system 100C is shown. The difference between the two is that, in this embodiment, the lighting system 100E further includes a second light source device 160 for providing a fourth light beam L4, a fifth light beam L5, a second compensation light beam LA2, and a third compensation light beam LA3. Specifically, in this embodiment, the second light source device 160 includes a fourth laser light source 161, a fifth laser light source 162, a second compensation light beam 165, and a third compensation light beam 166. The fourth laser light source 161 is used to provide the fourth light beam L4, the fifth laser light source 162 is used to provide the fifth light beam L5, the second compensation light source 165 is used to provide the second compensation light beam LA2, and the third compensation light source 166 is used to provide the third compensation light beam LA3. In this embodiment, the fourth laser light source 161 is a green laser diode, the fifth laser light source 162 is a green laser diode, the second compensation light source 165 is a red laser diode, and the third compensation light source 166 is a red laser diode, but the present invention is not limited to this. Therefore, the fourth light beam L4, the fifth light beam L5, the second compensation light beam LA2, and the third compensation light beam LA3 are green, green, red, and red, respectively. In one embodiment, the second compensation laser light source 165 and the third compensation laser light source 166 of the second light source device 160 can be interchanged, but the present invention is not limited thereto.

[0084] In this embodiment, the first reflective element 122 in the light guide device 120 includes a first portion B1 and a second portion B2. The first portion B1 is configured to reflect the first light beam L1 and the first compensation light beam LA1, while allowing the fourth light beam L4 and the fifth light beam L5 to pass through. The second portion B2 is configured to reflect the second light beam L2, the third light beam L3, and the third compensation light beam LA3, while allowing the second compensation light beam LA2 and the third compensation light beam LA3 to pass through. Furthermore, the first semi-reflective element 132 in the light splitting device 130 is configured to reflect a portion of the second light beam L2 while allowing another portion of the second light beam L2 to pass through.

[0085] In other words, in this embodiment, the first portion B1 of the first reflective element 122 is, for example, coated with a red light reflective coating, and the second portion B2 is, for example, coated with a blue-green light reflective coating. The first semi-reflective element 132 is, for example, a blue-green semi-reflective mirror. Figure 8B Only the transmission paths of the first light beam L1, the first compensation light beam LA1, the second compensation light beam LA2 and the third compensation light beam LA3 are shown. Figure 8C Only the transmission paths of the third light beam L3, the fourth light beam L4 and the fifth light beam L5 are shown. Figure 8D Only the transmission path of the second light beam L2 is shown. In this way, the uniformity of the light beam can be improved, thereby making the projection image of the projection device 100E have a good optical effect.

[0086] 9A to 9DEach of them is a schematic diagram showing different light beams of an illumination system according to another embodiment of the present invention. 9A to 9D The lighting system 100F of this embodiment is similar to Figure 6A The lighting system 100C shown in FIG. The difference between the two is that, in this embodiment, there are two first light source devices 110. The first reflective element 122 in the light guide device 120 includes a first portion B1 and a second portion B2, wherein the first portion B1 is used to reflect the first light beam L1 and the first compensation light beam LA1, while allowing the second light beam L2 and the third light beam L3 to pass through. The second portion B2 is used to reflect the second light beam L2 and the third light beam L3, while allowing the first light beam L1 and the first compensation light beam LA1 to pass through. In addition, the first semi-reflective element 132 in the spectrometer 130 is also used to reflect a portion of the second light beam L2 and a portion of the third light beam L3, while allowing another portion of the second light beam L2 and the third light beam L3 to pass through. In this embodiment, the positions of the first laser light source 111 and the first compensation laser light source 115 in each first light source device 110 can be interchanged, but the present invention is not limited to this.

[0087] In other words, in this embodiment, the first portion B1 of the first reflective element 122 is, for example, coated with a red light reflective coating, and the second portion B2 is, for example, coated with a blue-green light reflective coating. The first semi-reflective element 132 is, for example, a blue-green semi-reflective mirror. Figure 9B Only the transmission paths of the first light beam L1 and the first compensation light beam LA1 are shown. Figure 9C Only the transmission path of the third light beam L3 is shown. Figure 9D Only the transmission path of the second light beam L2 is shown. In this way, the uniformity of the light beam can be improved, thereby making the projection image of the projection device 100F have a good optical effect.

[0088] Figure 10 This is a schematic diagram of a lighting system according to another embodiment of the present invention. Figure 10 The lighting system 100G of this embodiment is similar to Figure 2 The lighting system 100 shown in FIG. 1 is different from the lighting system 100 in this embodiment in that the first reflective element 122A in the light guide device 120A is a curved reflector. Specifically, the first reflective element 122A is, for example, two reflective mirrors spliced ​​in a non-parallel manner, for reflecting the first light beam L1 and the first compensation light beam LA1 in the same direction but in a non-parallel manner. Figure 10 Therefore, the first composite light beam LC1 and the second composite light beam LC2 can be transmitted to the light homogenizing element 150 in a divergent manner. In this way, the uniformity of the light beams transmitted to the light homogenizing element 150 can be further improved, thereby making the projection image of the projection device 100G have a good optical effect.

[0089] Figure 11A schematic diagram of a lighting system according to another embodiment of the present application. The lighting system 100H according to this embodiment is similar to the lighting system 100B shown in Fig. 1B. The difference between the two is that in this embodiment, the light guide 120B and the light splitting device 130A are composed of prisms with reflective coating. In detail, the first reflective element 122B in the light guide 120B is, for example, a prism with reflective coating. The first light splitting element 124B is, for example, a prism with reflective coating for blue-green light. The first semi-reflective element 132A is, for example, a prism with reflective coating for blue-green light. Thus, the light guide 120B and the light splitting device 130A have a simple assembly and can further improve the uniformity of the light beams transmitted to the light homogenizing element 150, thereby providing a good optical effect for the projection image of the projection device 100H. Figure 5

[0090] In summary, the embodiments of the present application have at least one of the following advantages or effects. In the lighting system and the projection device according to the present application, the lighting system transmits the light beams provided by the first light source device to the light splitting device by the configuration of different optical elements in the light guide, and generates the first combined light beam and the second combined light beam by the light splitting device. In this way, the uniformity of the light beams transmitted to the light homogenizing element can be improved, thereby providing a good optical effect for the projection image of the projection device.

[0091] The above description is only preferred embodiments of the present application. It cannot be used to limit the scope of the present application, that is, any simple equivalent changes and modifications according to the claims and the description of the present application are still within the scope of the present application. In addition, any embodiment or claim of the present application does not necessarily achieve all the purposes or advantages or features disclosed in the present application. Furthermore, the abstract and title of the specification are only used to assist the patent document retrieval, and do not limit the scope of the present application. In addition, the terms "first", "second", etc. mentioned in the specification or claims are only used to name elements or distinguish different embodiments or ranges, and are not used to limit the upper or lower limit of the number of elements.​

Claims

1. A lighting system, characterized in that: The lighting system includes a first light source device, a second light source device, a light guide device, and a light splitting device, wherein: The first light source device is used to provide a first light beam, a second light beam, a third light beam and a first compensation light beam, the color of the first light beam is the same as the color of the first compensation light beam, the color of the first light beam is different from the color of the second light beam, and the color of the first light beam is different from the color of the third light beam; The second light source device is used to provide at least one red light beam; The first reflective element in the light guide device includes a first portion and a second portion, wherein the first portion is used to reflect the first light beam and the first compensation light beam, and the second portion allows the at least one red light beam provided by the second light source device to pass through; The light splitting device includes a first semi-reflective element, wherein the first semi-reflective element is used to reflect a portion of the second light beam and allow another portion of the second light beam to pass through, and the second portion of the first reflective element in the light guiding device is further used to reflect the other portion of the second light beam; and The second light source device is also used to provide a fourth light beam and a fifth light beam, and the at least one red light beam provided by the second light source device includes a second compensation beam and a third compensation beam, wherein the first portion of the first reflective element is used to allow the fourth light beam and the fifth light beam to pass through, and the second portion of the first reflective element is used to allow the second compensation beam and the third compensation beam to pass through.

2. The lighting system according to claim 1, wherein The color of the second light beam is different from the color of the fourth light beam.

3. The lighting system according to claim 1, wherein The third light beam is green.

4. The lighting system according to claim 1, wherein The color of the fourth light beam is the same as the color of the fifth light beam.

5. The lighting system according to claim 1, wherein The color of the second compensation light beam is the same as the color of the first light beam.

6. The lighting system according to claim 1, wherein The first semi-reflective element is disposed between the first light source device and the first reflective element on a transmission path of the second light beam.

7. The lighting system according to claim 6, characterized in that The color of the fourth light beam is the same as the color of the fifth light beam.

8. The lighting system according to claim 6, characterized in that The first semi-reflective element is disposed between the first light source device and the first reflective element on the transmission path of the third light beam. The first semi-reflective element is configured to reflect a portion of the third light beam and allow another portion of the third light beam to pass through.

9. The lighting system according to claim 1, wherein: The color of the second light beam is different from the color of the fourth light beam, the third light beam is green, and the first semi-reflective element is arranged between the first light source device and the first reflective element on the transmission path of the second light beam, and the first semi-reflective element is arranged between the first light source device and the first reflective element on the transmission path of the third light beam, and the first semi-reflective element is used to reflect a part of the third light beam and allow another part of the third light beam to pass through.

10. The lighting system according to claim 9, characterized in that The color of the second compensation light beam is the same as the color of the first light beam.

11. The lighting system according to claim 1, wherein It also includes a focusing element. On the transmission path of the second light beam, the first semi-reflective element is arranged between the first light source device and the focusing element.

12. The lighting system according to claim 11, characterized in that The light focusing element is used to receive the first light beam, the second light beam, the third light beam, the first compensation light beam and the at least one red light beam provided by the second light source device.

13. The lighting system according to claim 11, characterized in that The lighting system also includes a light homogenizing element. The first light beam, the second light beam, the third light beam, and the first compensation light beam emitted by the first light source device are transmitted to the light splitting device via the light guiding device, and the first light beam, the second light beam, the third light beam, and the first compensation light beam are transmitted to the focusing element via the light splitting device, and then transmitted to the light homogenizing element through the focusing element.

14. A lighting system, characterized in that: The lighting system includes a first light source device, a second light source device, a light guide device, and a light splitting device, wherein: The first light source device is used to provide a first light beam, a second light beam, a third light beam and a first compensation light beam, the color of the first light beam is the same as the color of the first compensation light beam, the color of the first light beam is different from the color of the second light beam, and the color of the first light beam is different from the color of the third light beam; The second light source device is used to provide a red light beam and at least one compensation light beam, The first reflective element in the light guide device includes a first portion and a second portion, wherein the first portion is used to reflect the first light beam and the first compensation light beam, and the second portion allows the red light beam and the at least one compensation light beam provided by the second light source device to pass through; The light splitting device includes a first semi-reflective element, wherein the first semi-reflective element is used to reflect a portion of the second light beam and allow another portion of the second light beam to pass through, and the second portion of the first reflective element in the light guiding device is also used to reflect the other portion of the second light beam, and The second light source device is further configured to provide a fourth light beam and a fifth light beam. The color of the fourth light beam is different from the color of the second light beam. The first portion of the first reflective element is configured to allow the fourth light beam and the fifth light beam to pass through.

15. The lighting system according to claim 14, characterized in that The third light beam is green.

16. The lighting system according to claim 14, characterized in that The first semi-reflective element is disposed between the first light source device and the first reflective element on a transmission path of the second light beam.

17. The lighting system according to claim 16, characterized in that The first semi-reflective element is disposed between the first light source device and the first reflective element on the transmission path of the third light beam. The first semi-reflective element is configured to reflect a portion of the third light beam and allow another portion of the third light beam to pass through.

18. The lighting system according to claim 14, wherein The color of the second light beam is different from the color of the fourth light beam, the third light beam is green, and the first semi-reflective element is arranged between the first light source device and the first reflective element on the transmission path of the second light beam, and the first semi-reflective element is arranged between the first light source device and the first reflective element on the transmission path of the third light beam, and the first semi-reflective element is used to reflect a part of the third light beam and allow another part of the third light beam to pass through.

19. The lighting system according to claim 14, wherein It also includes a focusing element. On the transmission path of the second light beam, the first semi-reflective element is arranged between the first light source device and the focusing element.

20. The lighting system according to claim 19, characterized in that The light focusing element is used to receive the first light beam, the second light beam, the third light beam, the first compensation light beam and the red light beam provided by the second light source device.

21. The lighting system according to claim 19, wherein The lighting system also includes a light homogenizing element. The first light beam, the second light beam, the third light beam, and the first compensation light beam emitted by the first light source device are transmitted to the light splitting device via the light guiding device, and the first light beam, the second light beam, the third light beam, and the first compensation light beam are transmitted to the focusing element via the light splitting device, and then transmitted to the light homogenizing element through the focusing element.

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