Lighting system and projection device

Abstract

An illumination system includes a first light source, a second light source, a light combining module, and a wavelength conversion element. The first light source provides a first light beam. The second light source provides a second light beam. The wavelength range of the first light beam differs from the wavelength range of the second light beam. The light combining module is disposed in the transmission paths of the first light beam from the first light source and the second light beam from the second light source. The wavelength conversion element includes a rotating disk, a wavelength conversion material layer, and a beam splitter. The beam splitter is disposed on the rotating disk, and the wavelength conversion material layer is disposed between the rotating disk and the beam splitter. The wavelength conversion material layer converts the first light beam into an excited light beam. The beam splitter reflects the second light beam and allows the first light beam and the excited light beam to pass through. This provides additional infrared light while maintaining a good volume.

Description

Technical Field

[0001] This invention relates to an optical system and an electronic device, and more particularly to an illumination system and a projection device. Background Technology

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

[0003] Currently, simulation projectors used in flight simulation, navigation simulation, driving simulation, and night vision training are equipped with infrared light sources to provide infrared light. However, in existing projector models, providing infrared light requires an additional infrared light source, which cannot be configured on the same optical path as the main light source. This results in these projectors being too large to share the same casing as existing models. Furthermore, in the existing optical path architecture, configuring an infrared light source cannot directly combine with the existing optical path.

[0004] The "Background Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Background Art" paragraph may include some known technologies that are not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of this invention were known or recognized by those skilled in the art before this application was filed. Summary of the Invention

[0005] The present invention provides a lighting system and a projection device that can provide additional infrared light for applications in different fields without the need to add additional optical lenses to maintain a good size, and thus can use the housing of existing models.

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

[0007] To achieve one, some, or all of the above objectives, or other objectives, the present invention provides an illumination system for providing an illumination beam. The illumination system includes a first light source, a second light source, a beam combining module, and a wavelength conversion element. The first light source provides a first beam, which is a laser beam. The second light source provides a second beam. The wavelength range of the first beam is different from the wavelength range of the second beam. The beam combining module is disposed on the transmission paths of the first beam from the first light source and the second beam from the second light source, so that the first beam and the second beam have the same transmission path between the beam combining module and the wavelength conversion element. The wavelength conversion element includes a rotating disk, a wavelength conversion material layer, and a beam splitting layer. The beam splitting layer is disposed on the rotating disk, and the wavelength conversion material layer is disposed between the rotating disk and the beam splitting layer. The wavelength conversion material layer is used to convert the first beam into an excited beam. The beam splitter is used to reflect the second beam and allow the first beam and the stimulated beam to pass through. When the first light source is turned on and the second light source is turned off, the illumination beam includes at least one of the first beam and the stimulated beam. When both the first light source and the second light source are turned on, the illumination beam includes at least one of the first beam, the second beam and the stimulated beam.

[0008] To achieve one, some, or all of the above objectives, or other objectives, the present invention further provides a projection device, including an illumination system, at least one light valve, and a projection lens. The illumination system provides an illumination beam. The illumination system includes a first light source, a second light source, a beam combining module, and a wavelength conversion element. The first light source provides a first beam, which is a laser beam. The second light source provides a second beam. The wavelength range of the first beam is different from the wavelength range of the second beam. The beam combining module is disposed on the transmission paths of the first beam from the first light source and the second beam from the second light source, so that the first beam and the second beam have the same transmission path between the beam combining module and the wavelength conversion element. The wavelength conversion element includes a rotating disk, a wavelength conversion material layer, and a beam splitting layer. The beam splitting layer is disposed on the rotating disk, and the wavelength conversion material layer is disposed between the rotating disk and the beam splitting layer. The wavelength conversion material layer converts the first beam into an excited beam. A beam-splitting layer reflects the second light beam and allows the first light beam and the stimulated light beam to pass through. When the first light source is on and the second light source is off, the illumination beam includes at least one of the first light beam and the stimulated light beam. When both the first and second light sources are on, the illumination beam includes at least one of the first light beam, the second light beam, and the stimulated light beam. At least one light valve is disposed in the transmission path of the illumination beam to convert the illumination beam into an image beam. A projection lens is disposed in the transmission path of the image beam to project the image beam out of the projection device.

[0009] Based on the above, embodiments of the present invention have at least one of the following advantages or effects. In the lighting system and projection device of the present invention, the lighting system includes a first light source, a second light source, a light combining module, and a wavelength conversion element. The first light source provides a first beam, and the second light source provides a second beam. When the first beam and the second beam pass through the light combining module simultaneously or at different times and are transmitted to the wavelength conversion element along the same transmission path, the first beam passes through a beam splitter to generate an excited beam through the region where the wavelength conversion material layer is distributed, or to generate reflection through the region where the wavelength conversion material layer is not distributed. The second beam is reflected through the beam splitter, or to generate reflection through the region where the wavelength conversion material layer is not distributed, such that the first beam, the second beam, and the excited beam form illumination beams respectively in the same or different time sequences. In this way, the projection device can additionally provide infrared light for applications in different fields without needing to add additional optical lenses to maintain a good size. On the other hand, existing projection device models can be upgraded to reuse the existing housing.

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

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

[0012] Figure 2A and Figure 2B These are schematic diagrams of a lighting system according to an embodiment of the present invention at different time sequences.

[0013] Figure 2C for Figure 2A and Figure 2B A schematic diagram of the first light source, second light source, and light combining module of the lighting system from another perspective.

[0014] Figure 2D and Figure 2E These are schematic diagrams of a lighting system according to another embodiment of the present invention at different time sequences.

[0015] Figure 2F This is a timing diagram of a lighting system according to an embodiment of the present invention.

[0016] Figure 2G This is another timing diagram of a lighting system according to an embodiment of the present invention.

[0017] Figure 3 This is a cross-sectional schematic diagram of a wavelength conversion element according to an embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of a beam splitter element according to an embodiment of the present invention.

[0019] Figure 5A and Figure 5B They are respectively Figure 4 Wavelength transmittance curves in different regions of the beam splitter.

[0020] Figure 6A and Figure 6B These are schematic diagrams of the beam-splitting elements according to different embodiments of the present invention.

[0021] Figure 7A and Figure 7B They are respectively Figure 6A Wavelength transmittance curves in different regions of the beam splitter.

[0022] Figures 8A to 8D These are wavelength transmittance curves for different regions in a filter element according to an embodiment of the present invention.

[0023] Figure 9 This is a cross-sectional schematic diagram of a wavelength conversion element according to another embodiment of the present invention.

[0024] Figure 10 This is a timing diagram of a lighting system according to another embodiment of the present invention.

[0025] List of reference numerals

[0026] 10: Projection device

[0027] 60: Light valve

[0028] 70: Projection lens

[0029] 100: Lighting System

[0030] 110: First Light Source

[0031] 120, 120A: Second light source

[0032] 130: Photosynthesis Module

[0033] 132, 134: Optical combining element

[0034] 132A: Strip-shaped coating area

[0035] 136: Reflector

[0036] 137: Condensing Lens

[0037] 138: Collimating Lens

[0038] 139: Lens Array

[0039] 140, 140A: Wavelength conversion element

[0040] 142: Turntable

[0041] 144: Wavelength conversion material layer

[0042] 146, 146A: Spectroscopic layer

[0043] 148: High-reflectivity coating

[0044] 150: Relay Optical Module

[0045] 151: Condenser lens group

[0046] 1511: First Condenser

[0047] 1512: Second Condenser

[0048] 152, 152A, 152B: Spectrometers

[0049] 153: Converging Lens

[0050] 154: Reflective element

[0051] 155: Lens

[0052] 160: Filter element

[0053] 170: Beam homogenizer

[0054] 200-207: Curve

[0055] A: Zone 1

[0056] B1~B3: Second Zone

[0057] B21, B31: First Sub-region

[0058] B22, B32: Second Sub-region

[0059] L1: First beam

[0060] L2: Second beam

[0061] L3: Excited beam

[0062] LB: Illumination beam

[0063] LI: Image beam. Detailed Implementation

[0064] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0065] Figure 1This is a schematic diagram of a projection device according to an embodiment of the present invention. Please refer to... Figure 1 This embodiment provides a projection device 10, including an illumination system 100, at least one light valve 60, and a projection lens 70. The illumination system 100 provides 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 projects the image beam LI from the projection device 10 onto a projection target (not shown), such as a screen or wall.

[0066] 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 can also be a transmissive light modulator such as a Transparent Liquid Crystal Panel, an Electro-Optical Modulator, a Magneto-Optic Modulator, or an Acousto-Optic Modulator (AOM). This invention does not limit the type or form of the light valve 60. The detailed steps and implementation methods of the method by which the light valve 60 converts the illumination beam LB into the image beam LI are sufficiently taught, suggested, and illustrated by common knowledge in the art, and therefore will not be elaborated further. In different embodiments, the number of light valves 60 can be designed to be one to three, and this invention is not limited thereto.

[0067] The projection lens 70 may include, for example, a combination of one or more optical lenses with refractive power, such as various combinations of non-planar lenses including biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 70 may also include planar optical lenses to project the image beam L1 from the light valve 60 onto the projection target in a reflective manner. The present invention does not limit the type or form of the projection lens 70.

[0068] Figure 2A and Figure 2B These are schematic diagrams of a lighting system according to an embodiment of the present invention at different time sequences. Figure 2C for Figure 2A and Figure 2B A schematic diagram of the first light source, second light source, and light combining module of the lighting system from another perspective. Please refer to... Figures 1 to 2B The lighting system 100 shown in this embodiment can be applied to at least... Figure 1The lighting system 100 shown is used as an example in the following description. The lighting system 100 includes a first light source 110, a second light source 120, a light combining module 130, and a wavelength conversion element 140. The first light source 110 provides a first light beam L1, and the second light source 120 provides a second light beam L2, wherein the wavelength range of the first light beam L1 is different from the wavelength range of the second light beam L2. The first light source 110 and the second light source 120 include, for example, light-emitting diodes (LEDs), LED arrays, laser diodes (LDs), or laser diode arrays. In this embodiment, the first light beam L1 is, for example, a blue laser beam, and the second light beam L2 is, for example, an infrared laser beam. However, in different embodiments, the second light beam L2 may be designed, for example, a red laser beam with a dominant wavelength of 638 nanometers, or a combination of a red laser beam and an infrared laser beam; the invention is not limited thereto.

[0069] A beam combining module 130 is positioned along the transmission paths of a first beam L1 from a first light source 110 and a second beam L2 from a second light source 120, ensuring that the first beam L1 and the second beam L2 have the same transmission path between the beam combining module 130 and the wavelength conversion element 140. For example, in this embodiment, the beam combining module 130 includes a beam combining element 132. The first beam L1 from the first light source 110 and the second beam L2 from the second light source 120 are incident from opposite sides of the beam combining element 132, wherein one of the first beam L1 and the second beam L2 is reflected by the beam combining element 132, and the other of the first beam L1 and the second beam L2 passes through the beam combining element 132. The beam combining element 132 may be, for example, a stripe mirror, but this is not a limitation; any element capable of beam splitting and combining is within the scope of this invention. Please refer to... Figure 2CSpecifically, the light combining element 132 includes a plurality of staggered strip-shaped coated areas 132A and a plurality of strip-shaped uncoated areas (not labeled). Each of the plurality of strip-shaped coated areas 132A is used to reflect the second beam L2 and allow the first beam L1 to pass through. In another embodiment, the light combining element 132 is, for example, a light-transmitting element. At least one of the opposite sides of the light combining element 132 is provided with a dichroic film (not shown). One of the first beam L1 and the second beam L2 is reflected by the dichroic film of the light combining element 132, and the other of the first beam L1 and the second beam L2 passes through the dichroic film of the light combining element 132. In this embodiment, the first light source 110 includes, for example, two sets of light-emitting units (unlabeled), each light-emitting unit including at least one light-emitting diode or at least one laser diode. The light-combining module 130 may also include another light-combining element 134 and a reflector 136. The other light-combining element 134 includes multiple strip-shaped reflective coatings (unlabeled) for combining the first light beam L1 from the two sets of light-emitting units and transmitting it to the light-combining element 132. The reflector 136 is used to reflect the second light beam L2 from the second light source 120 to the light-combining element 132. More specifically, the illumination system 100 also includes a condenser lens 137, a collimating lens 138, a fly-eye lens array 139, a relay optical module 150, a condenser lens group 151 (including a first condenser lens 1511 and a second condenser lens 1512), a converging lens 153, a lens 155, a filter element 160, and a light-diffusing element 170.

[0070] Figure 2D and Figure 2E These are schematic diagrams of a lighting system according to another embodiment of the present invention at different time sequences. Figure 2D and Figure 2A They are roughly the same. Figure 2E and Figure 2B They are roughly the same. Figure 2D and Figure 2A The only difference is that the second light source 120 is positioned where it was originally... Figure 2A The position of the reflector 136, therefore Figure 2D The light combining module 130 does not require an additional reflector 136; the second beam L2 from the second light source 120 is directly incident on the light combining element 132. Similarly, Figure 2E and Figure 2B The only difference is that the second light source 120 is positioned where it was originally... Figure 2B The position of the reflector 136, therefore Figure 2E The light combining module 130 does not require an additional reflector 136, and the second beam L2 of the second light source 120 is directly incident on the light combining element 132.

[0071] Please continue to refer to this. Figure 2A and Figure 2BA condenser lens 137 is positioned along the transmission paths of the first beam L1 and the second beam L2 emitted from the beam combining module 130. It converges the first beam L1 and the second beam L2 and transmits them to the collimating lens 138, which then transmits them to the lens array 139. The collimating lens 138 collimates the first beam L1 and the second beam L2 and transmits them to the relay optical module 150 via the lens array 139. The relay optical module 150 guides the first beam L1 and the second beam L2 to the condenser lens group 151 and then transmits them to the wavelength conversion element 140. The light transmission path after the beams enter the wavelength conversion element 140 will be described using the timing diagram mentioned below.

[0072] Figure 2F This is a timing diagram of a lighting system according to an embodiment of the present invention. Please refer to the following: Figure 2A and Figure 2B Matching Figure 2F In this embodiment, both the first light source 110 and the second light source 120 are turned on. The wavelength conversion element 140 is a reflective wavelength conversion wheel. The wavelength conversion element 140 has a non-wavelength conversion region and a wavelength conversion region. The wavelength conversion region and the non-wavelength conversion region together form an annular region and enter the transmission path of the first beam L1 and / or the second beam L2 at different times. During the first region timing, the non-wavelength conversion region of the wavelength conversion element 140 enters the transmission path of the first beam L1 and / or the second beam L2. The non-wavelength conversion region reflects the first beam L1 and the second beam L2 back to the condenser lens group 151 and back to the relay optical module 150. The relay optical module 150 transmits the first beam L1 and the second beam L2 to the converging lens 153 and the lens 155. The filter element 160 transmits the first beam L1 and the second beam L2 to the homogenizing element 170, corresponding to... Figure 2A When the wavelength conversion element 140 is in the second region timing, the wavelength conversion region enters the transmission path of the first beam L1 and / or the second beam L2, converting the first beam L1 into an excited beam L3. The excited beam L3 and the second beam L2 pass through the condenser lens group 151 and are transmitted to the relay optical module 150. The relay optical module 150 then transmits the excited beam L3 and the second beam L2 to the converging lens 153 and the lens 155. Finally, the filter element 160 transmits the excited beam L3 and the second beam L2 to the homogenizing element 170. Figure 2B This allows the illumination beam LB to include at least one of a first beam L1, a second beam L2, and an excited beam L3. Specifically, the illumination beam LB includes the first beam L1 and the second beam L2, or the illumination beam LB includes the second beam L2 and the excited beam L3.

[0073] Figure 2G This is another timing diagram of a lighting system according to an embodiment of the present invention. Figure 2G and Figure 2F They are largely the same, with the only difference being... Figure 2G The implementation method involves turning off the second light source 120, meaning that the lighting system 100 operates using only the first beam L1 without providing the second beam L2. Figure 2G Timing when using the first light source 110 and Figure 2F The implementation method is the same, so it will not be described again here. In this embodiment, under projection operation without infrared light, the illumination system 100 only uses the first beam L1 and the stimulated beam L3. The illumination beam LB includes at least one of the first beam L1 and the stimulated beam L3. However, in specific situations, such as in simulated night vision, an infrared laser beam can be used to enhance the visual effect, in which case the second light source 120 is turned on. Figure 2F and Figure 2G For limitations. The following will be based on... Figure 2F The implementation method will be described further.

[0074] Figure 3 This is a cross-sectional schematic diagram of a wavelength conversion element according to an embodiment of the present invention. Please refer to... Figure 2A , Figure 2B , Figure 2D , Figure 2E and Figure 3 . Figure 3 The wavelength conversion element 140 shown can be applied to at least Figure 2A , Figure 2B , Figure 2D , Figure 2E The wavelength conversion element 140 shown in the diagram will be used as an example in the following description. The wavelength conversion element 140 includes a rotary disk 142, a wavelength conversion layer 144, and a beam-splitting layer 146, wherein the wavelength conversion material layer 144 and the beam-splitting layer 146 are disposed in the wavelength conversion region. The rotary disk 142 is made of, for example, metal or other materials capable of reflecting light beams. In this embodiment, a high-reflectivity coating 148 is also disposed on the surface of the rotary disk 142 in both the wavelength conversion region and the non-wavelength conversion region to enhance the reflection effect of the light beam. The wavelength conversion material layer 144 is disposed on the rotary disk 142 to convert the incident first light beam L1 into an excited light beam L3.

[0075] A beam-splitting layer 146 is disposed on a turntable 142. The beam-splitting layer 146 reflects the second beam L2 and allows the first beam L1 and the excited beam L3 to pass through. In this embodiment, a wavelength conversion material layer 144 is disposed between a high-reflectivity coating 148 and a beam-splitting layer 146; that is, the beam-splitting layer 146, the wavelength conversion material layer 144, and the high-reflectivity coating 148 are sequentially disposed on the turntable 142. In one embodiment, if the turntable 142 is made of a material capable of reflecting light beams, the wavelength conversion material layer 144 is disposed between the turntable 142 and the beam-splitting layer 146; that is, the high-reflectivity coating 148 may not be disposed between the wavelength conversion layer 144 and the turntable 142. In other words, since the second beam L2 is reflected by the beam-splitting layer 146, the wavelength conversion material layer 144 is not located in the transmission path of the second beam L2. The wavelength conversion material layer 144 is disposed only in the wavelength conversion region of the wavelength conversion element 140 to convert the first beam L1 into an excited beam L3. The high-reflectivity coating 148 in the non-wavelength conversion region of the wavelength conversion element 140 is used to reflect the first beam L1 and the second beam L2. If the turntable 142 is made of a material capable of reflecting light beams, the high-reflectivity coating 148 may not be disposed in the non-wavelength conversion region, and the first beam L1 and the second beam L2 are reflected by the turntable 142. Therefore, when the turntable 142 rotates, the first beam L1 is transmitted to the non-wavelength conversion region of the wavelength conversion element 140 in the first region timing sequence, and the first beam L1 is reflected. The first beam L1 is transmitted to the wavelength conversion region in the second region timing sequence, and the wavelength conversion material layer 144 converts the first beam L1 into an excited beam L3. In this embodiment, the wavelength conversion material layer 144 includes, for example, phosphors for exciting fluorescence, and the wavelength conversion layer disposed in the wavelength conversion region is, for example, a phosphor that can excite one color of fluorescence, or different phosphors that can excite different colors of fluorescence. In this embodiment, the wavelength conversion layer configured in the wavelength conversion region is, for example, a green phosphor that can emit green light, a red phosphor that can emit red light, and a yellow phosphor that can emit yellow light. That is, when the green phosphor, red phosphor, and yellow phosphor on the wavelength conversion element 140 enter the transmission path of the first light beam L1 in sequence, they can be converted into green, red, and yellow excited light beams L3 at different times. The beam splitting layer 146 is, for example, an infrared reflective coating with a transmittance greater than 90% for light with wavelengths from 400 nm to 680 nm and a reflectance greater than 90% for light with wavelengths from 700 nm to 1200 nm, formed on the surface of the wavelength conversion material layer 144.

[0076] Therefore, when the first beam L1 and the second beam L2 pass through the beam combining module 130 and are transmitted along the same transmission path to the wavelength conversion element 140, in the first time zone, the first beam L1 and the second beam L2 are reflected by the non-wavelength conversion region of the undistributed wavelength conversion material layer 144. In the second time zone, the first beam L1 passes through the beam splitting layer 146 to generate an excited beam L3 by the region of the distributed wavelength conversion material layer 144, and the second beam L2 is reflected by the beam splitting layer 146. This allows the first beam L1 and the second beam L2 to be output from the illumination system 100 as illumination beams LB in the first time zone, and the second beam L2 and the excited beam L3 to be output from the illumination system 100 as illumination beams LB in the second time zone. In this way, the projection device 10 can provide an additional infrared light source for applications in different fields without the need to add additional optical lenses to maintain a good size. On the other hand, existing projection device 10 models can also be upgraded to use the existing model's housing.

[0077] Figure 4 This is a schematic diagram of a beam splitter element according to an embodiment of the present invention. Figure 5A and Figure 5B They are respectively Figure 4 The wavelength transmittance curves for different regions of the beam splitter are shown in the diagram. Please refer to... Figure 2A , Figure 2B Matching Figure 4 , Figure 5A and Figure 5B In this embodiment, a relay optical module 150 is disposed between the beam combining module 130 and the wavelength conversion element 140. The relay optical module 150 includes a beam splitter 152 and a reflector 154. The beam splitter 152 is disposed on the transmission path of the first beam L1 and the second beam L2 between the beam combining module 130 and the wavelength conversion element 140, allowing at least a portion of the first beam L1 and the second beam L2 to pass through and reflecting the excited beam L3. The reflector 154 is disposed on the transmission path of the first beam L1 and the second beam L2 from the beam splitter 152, reflecting the first beam L1 and the second beam L2. The reflector 154 is, for example, a mirror.

[0078] In detail, the beam splitter 152 includes a first region A and a second region B1 connected to each other. The first region A allows a first beam L1 and a second beam L2 to pass through and reflects an excited beam L3. The second region B1 allows a portion of the first beam L1 and the second beam L2 to pass through and reflects another portion of the first beam L1 and the second beam L2, as well as reflecting the excited beam L3. Specifically, the first region A is located on the transmission path of the first beam L1 and the second beam L2 from the beam combining module 130, and the second region B1 is located on the transmission path of the first beam L1 and the second beam L2 from the wavelength conversion element 140. For example, the first region A may have a coating that reflects the excited beam L3 and be configured to allow the first beam L1 and the second beam L2 to pass through, and its corresponding transmittance versus wavelength curve 200 is as follows. Figure 5A As shown, the second region B1, for example, has a coating that reflects the excited beam L3, and also has a semi-reflective, semi-transparent coating that allows half of the first beam L1 and the second beam L2 to pass through and half to be reflected. The corresponding transmittance versus wavelength curve 201 is shown below. Figure 5B As shown, the transmittance of the first region A to the first beam L1 and the second beam L2 is greater than that of the second region B1 to the first beam L1 and the second beam L2. By adjusting the spatial ratio distribution of the first region A and the second region B1 or by designing the reflectivity of the second region B1, the energy of the beams emitted from the first region A and the second region B1 can be made the same.

[0079] Figure 6A and Figure 6B These are schematic diagrams of the beam-splitting elements according to different embodiments of the present invention. Figure 7A and Figure 7B They are respectively Figure 6A The wavelength transmittance curves for different regions of the beam splitter are shown in the diagram. Please refer to... Figures 6A to 7B In other embodiments, the second region B2 in the beam splitter 152A includes at least one first sub-region B21 and at least one second sub-region B22. In one embodiment, the areas of the at least one first sub-region B21 and the at least one second sub-region B22 are substantially the same. Figure 6A In the illustrated embodiment, there are multiple first sub-regions B21 and multiple second sub-regions B22, and the multiple first sub-regions B21 and multiple second sub-regions B22 are arranged in a checkerboard pattern. The first sub-region B21, for example, is the same as the first region A, used to allow the first beam L1 and the second beam L2 to pass through, and to reflect the excited beam L3. Its corresponding transmittance versus wavelength curve 202 is as follows. Figure 7A As shown. The second sub-region B22 is used to reflect the first beam L1, the second beam L2, and the excited beam L3, and for example, has a reflective coating. Its corresponding transmittance versus wavelength curve 203 is shown below. Figure 7B As shown. In another embodiment, as Figure 6BAs shown, the second region B3 has one first sub-region B31 and one second sub-region B32, arranged in a strip shape and adjacent to each other. The transmittance versus wavelength curves corresponding to the first sub-region B31 and the second sub-region B32 are the same as curves 202 and 203 in the previous embodiment, meaning that one region allows the first beam L1 and the second beam L2 to pass through and reflects the excited beam L3, while the other region reflects the first beam L1, the second beam L2, and the excited beam L3, as shown. Figure 7A and Figure 7B As shown.

[0080] Figures 8A to 8D These are wavelength transmittance curves for different regions in a filter element according to an embodiment of the present invention. Please refer to them. Figure 2A , Figure 2B and Figures 8A to 8D A filter element 160 is disposed on the transmission paths of the first beam L1, the second beam L2, and the stimulated beam L3 to allow the first beam L1, the second beam L2, and the stimulated beam L3 to pass through sequentially. Specifically, the filter element 160 is disposed on the transmission paths of the first beam L1, the second beam L2, and the stimulated beam L3 from the relay optical module 150. The filter element 160 is, for example, a color filter wheel, with different filtering areas disposed in different regions of the rotating disk. For example, in this embodiment, the filter element 160 includes a light-transmitting area, a green light filtering area, a red light filtering area, and a yellow light filtering area. The light-transmitting area allows the light beam to pass through, and its corresponding transmittance versus wavelength curve 204 is shown below. Figure 8A As shown, the green light filter area is used to allow green light of a specific wavelength range to pass through while reflecting blue and red light. Its corresponding transmittance versus wavelength curve 205 is shown below. Figure 8B As shown, the red light filter area allows red light and light with wavelengths above red to pass through within a specific wavelength range, while reflecting green light and light with wavelengths below green. Its corresponding transmittance versus wavelength curve is shown in Figure 206. Figure 8C As shown, the yellow light filter area is used to allow green light and light with wavelengths longer than green light to pass through within a specific wavelength range, while reflecting blue light. Its corresponding transmittance versus wavelength curve 207 is shown below. Figure 8D As shown. In this embodiment, the second beam L2 (infrared light) can pass through the filter element 160 at all times.

[0081] The homogenizing element 170 is disposed on the transmission path of the light beam from the filter element 160 to adjust the spot shape of the illumination beam LB so that the spot shape of the illumination beam LB can match the shape of the working area of ​​the light valve (e.g., rectangular), and so that the light spot has a uniform or nearly uniform light intensity, thus homogenizing the light intensity of the illumination beam LB. In this embodiment, the homogenizing element 170 is, for example, an integrating column, but in other embodiments, the homogenizing element 170 may also be other suitable optical elements, such as a lens array (compound eye lens array), and the present invention is not limited thereto.

[0082] Please refer to this again. Figure 1 and Figure 2F In conjunction with the descriptions in the preceding paragraphs, this embodiment can be divided into four different time sequences: blue light, green light, red light, and yellow light. Specifically, in the blue to yellow light sequence, both the first light source 110 and the second light source 120 are turned on. In the blue light sequence, when the first beam L1 and the second beam L2 are transmitted to the wavelength conversion element 140, the wavelength conversion element 140 reflects the first beam L1 and the second beam L2. The second beam L2 and the first beam L1 then pass through the light-transmitting area of ​​the filtering element 160 and enter the homogenizing element 170, thus serving as the illumination beam LB (blue light and infrared light). In the green light sequence, when the first beam L1 and the second beam L2 are transmitted to the wavelength conversion element 140, the wavelength conversion element 140 reflects the second beam L2, converting the first beam L1 into a green stimulated beam L3. The second beam L2 and the green stimulated beam L3 then pass through the green light filtering area of ​​the filtering element 160 and enter the homogenizing element 170, thus serving as the illumination beam LB (green light and infrared light). In the red light sequence, when the first beam L1 and the second beam L2 are transmitted to the wavelength conversion element 140, the wavelength conversion element 140 reflects the second beam L2, converting the first beam L1 into a red stimulated beam L3. The second beam L2 and the red stimulated beam L3 then pass through the red light filtering area of ​​the filtering element 160 and enter the homogenizing element 170, thus serving as the illumination beam LB (red light and infrared light). In the sequence of yellow light, when the first beam L1 and the second beam L2 are transmitted to the wavelength conversion element 140, the wavelength conversion element 140 reflects the second beam L2 and converts the first beam L1 into a yellow excited beam L3. The second beam L2 and the yellow excited beam L3 pass through the yellow light filtering area of ​​the filter element 160 and enter the homogenizing element 170, and then serve as the illumination beam LB (yellow light and infrared light).

[0083] Figure 9 This is a cross-sectional schematic diagram of a wavelength conversion element according to another embodiment of the present invention. Figure 10 This is a timing diagram of a lighting system according to another embodiment of the present invention. Please refer to... Figure 2A , Figure 2B , Figure 9 and Figure 10 The wavelength conversion element 140A shown in this embodiment is similar to... Figure 2A and Figure 2B The wavelength conversion element 140 is shown. The difference lies in that, in this embodiment, the second light source 120A of the illumination system is selected to provide a red light-emitting diode or laser diode, and the second beam L2 provided is, for example, a red laser beam with a dominant wavelength of 638 nanometers. The beam-splitting layer 146A of the wavelength conversion element 140A is, for example, replaced with a red light reflective coating that has a transmittance greater than 90% for light with wavelengths from 400 nanometers to 600 nanometers and a reflectance greater than 90% for light with wavelengths greater than 600 nanometers. Therefore, in the blue to yellow light sequence, the second light source 120A is only turned on during the red light and yellow light sequences, as shown. Figure 10 As shown, the illumination beam is at least one of the first beam, the second beam (red light), and the excited beam. This allows for improved optical quality of the red and yellow light in the illumination system without requiring additional optical lenses to maintain a good size. Alternatively, existing projection devices can be upgraded to utilize the existing casing.

[0084] In summary, in the lighting system and projection device of the present invention, the lighting system includes a first light source, a second light source, a light combining module, and a wavelength conversion element. The first light source provides a first beam, and the second light source provides a second beam. When the first beam and the second beam pass through the light combining module simultaneously or at different times and are transmitted to the wavelength conversion element along the same transmission path, the first beam passes through the beam splitter to generate an excited beam through the region where the wavelength conversion material layer is distributed, or to generate reflection through the region where the wavelength conversion material layer is not distributed. The second beam is reflected through the beam splitter, or to generate reflection through the region where the wavelength conversion material layer is not distributed, so that the first beam, the second beam, and the excited beam form illumination beams respectively in the same or different time sequences. In this way, the projection device can provide an additional infrared light source for applications in different fields without the need to add additional optical lenses to maintain a good size. On the other hand, existing projection device models can be upgraded to use the housing of existing models.

[0085] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All simple equivalent changes and modifications made in accordance with the claims and specification of the present invention are still within the scope of the patent coverage of the present invention. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the present invention. In addition, the abstract and title are only used to assist in patent document retrieval and are not intended to limit the scope of the invention. Furthermore, the terms "first," "second," etc., mentioned in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

Claims

1. A lighting system for providing an illumination beam, the lighting system comprising a first light source, a second light source, a light combining module, and a wavelength conversion element, wherein: The first light source is used to provide a first beam, which is a laser beam; The second light source is used to provide a second beam, the wavelength range of the first beam is different from the wavelength range of the second beam, and the beam combining module is configured on the transmission path of the first beam from the first light source and the second beam from the second light source, so that the first beam and the second beam have the same transmission path between the beam combining module and the wavelength conversion element. as well as The wavelength conversion element includes a rotating disk, a wavelength conversion material layer, and a beam-splitting layer, wherein: The beam-splitting layer is disposed on the turntable, and the wavelength conversion material layer is disposed between the turntable and the beam-splitting layer; The wavelength conversion material layer is used to convert the first beam into an excited beam; and The beam-splitting layer is used to reflect the second beam and allow the first beam and the stimulated beam to pass through, wherein when the first light source is turned on and the second light source is turned off, the illumination beam includes at least one of the first beam and the stimulated beam, and when both the first light source and the second light source are turned on, the illumination beam includes at least one of the first beam, the second beam and the stimulated beam.

2. The lighting system as described in claim 1, characterized in that, The second beam is infrared light or red light with a dominant wavelength of 638 nanometers.

3. The lighting system as described in claim 1, characterized in that, The light combining module includes a light combining element. A first light beam from the first light source and a second light beam from the second light source are incident from opposite sides of the light combining element, wherein one of the first light beam and the second light beam is reflected by the light combining element, and the other of the first light beam and the second light beam penetrates the light combining element.

4. The lighting system as described in claim 3, characterized in that, The light combining element includes a plurality of staggered strip-shaped coated areas and a plurality of strip-shaped uncoated areas, wherein each of the plurality of strip-shaped coated areas is used to reflect the second light beam and allow the first light beam to pass through.

5. The lighting system as claimed in claim 1, characterized in that, The lighting system further includes a relay optical module, which comprises a beam-splitting element and a reflective element, wherein: The beam-splitting element is disposed on the transmission path of the first beam and the second beam between the beam-combining module and the wavelength conversion element, so as to allow at least a portion of the first beam and the second beam to pass through and reflect the excited beam; and The reflective element is disposed on the transmission path of the first beam and the second beam from the beam splitter to reflect the first beam and the second beam.

6. The lighting system as described in claim 5, characterized in that, The beam-splitting element includes a first region and a second region connected together, wherein: The first region is used to allow the first beam and the second beam to pass through and to reflect the excited beam; and The second region is used to allow a portion of the first beam and the second beam to pass through, and to reflect another portion of the first beam and the second beam, as well as the excited beam.

7. The lighting system as claimed in claim 6, characterized in that, The second region includes at least one first sub-region and at least one second sub-region, wherein: The at least one first sub-region is used to allow the first beam and the second beam to pass through and to reflect the excited beam; and The at least one second sub-region is used to reflect the first beam, the second beam, and the excited beam.

8. The lighting system as claimed in claim 7, characterized in that, The areas of the at least one first sub-region and the at least one second sub-region are approximately the same.

9. The lighting system as claimed in claim 7, characterized in that, The number of the at least one first sub-region and the at least one second sub-region are both multiple, and the multiple first sub-regions and the multiple second sub-regions are arranged in a strip-like or checkerboard pattern.

10. The lighting system as claimed in claim 1, characterized in that, The lighting system also includes a filter element, wherein: The filter element is disposed on the transmission path of the first beam, the second beam, and the excited beam to allow the first beam, the second beam, and the excited beam to pass through sequentially.

11. A projection device, comprising an illumination system, at least one light valve, and a projection lens, wherein: The lighting system is used to provide an illumination beam, and the lighting system includes a first light source, a second light source, a light combining module, and a wavelength conversion element, wherein: The first light source is used to provide a first beam, which is a laser beam; The second light source provides a second beam, the wavelength range of which differs from that of the first beam. The beam combining module is positioned on the propagation paths of the first beam from the first light source and the second beam from the second light source, so that the first beam and the second beam have the same propagation path between the beam combining module and the wavelength conversion element. The wavelength conversion element includes a rotating disk, a wavelength conversion material layer, and a beam-splitting layer, wherein: The beam-splitting layer is disposed on the turntable, and the wavelength conversion material layer is disposed between the turntable and the beam-splitting layer; The wavelength conversion material layer is used to convert the first beam into an excited beam; and The beam-splitting layer is used to reflect the second beam and allow the first beam and the stimulated beam to pass through, wherein when the first light source is turned on and the second light source is turned off, the illumination beam includes at least one of the first beam and the stimulated beam, and when both the first light source and the second light source are turned on, the illumination beam includes at least one of the first beam, the second beam and the stimulated beam. The at least one light valve is disposed in the transmission path of the illumination beam to convert the illumination beam into an image beam; and The projection lens is positioned on the transmission path of the image beam to project the image beam out of the projection device.

12. The projection device as claimed in claim 11, characterized in that, The second beam is infrared light or red light with a dominant wavelength of 638 nanometers.

13. The projection device as claimed in claim 11, characterized in that, The light combining module includes a light combining element. A first light beam from the first light source and a second light beam from the second light source are incident from opposite sides of the light combining element, wherein one of the first light beam and the second light beam is reflected by the light combining element, and the other of the first light beam and the second light beam penetrates the light combining element.

14. The projection device as claimed in claim 13, characterized in that, The light combining element includes a plurality of staggered strip-shaped coated areas and a plurality of strip-shaped uncoated areas, wherein each of the plurality of strip-shaped coated areas is used to reflect the second light beam and allow the first light beam to pass through.

15. The projection device as claimed in claim 11, characterized in that, The lighting system further includes a relay optical module, which comprises a beam-splitting element and a reflective element, wherein: The beam-splitting element is disposed on the transmission path of the first beam and the second beam between the beam-combining module and the wavelength conversion element, so as to allow at least a portion of the first beam and the second beam to pass through and reflect the excited beam; and The reflective element is disposed on the transmission path of the first beam and the second beam from the beam splitter to reflect the first beam and the second beam.

16. The projection device as claimed in claim 15, characterized in that, The beam-splitting element includes a first region and a second region connected together, wherein: The first region is used to allow the first beam and the second beam to pass through and to reflect the excited beam; and The second region is used to allow a portion of the first beam and the second beam to pass through, and to reflect another portion of the first beam and the second beam, as well as the excited beam.

17. The projection device as claimed in claim 16, characterized in that, The second region includes at least one first sub-region and at least one second sub-region, wherein: The at least one first sub-region is used to allow the first beam and the second beam to pass through and to reflect the excited beam; and The at least one second sub-region is used to reflect the first beam, the second beam, and the excited beam.

18. The projection device as claimed in claim 17, characterized in that, The areas of the at least one first sub-region and the at least one second sub-region are approximately the same.

19. The projection device as claimed in claim 17, characterized in that, The number of the at least one first sub-region and the at least one second sub-region are both multiple, and the multiple first sub-regions and the multiple second sub-regions are arranged in a strip-like or checkerboard pattern.

20. The projection device as claimed in claim 11, characterized in that, The lighting system also includes a filter element, wherein: The filter element is disposed on the transmission path of the first beam, the second beam, and the excited beam to allow the first beam, the second beam, and the excited beam to pass through sequentially.

Images