Light source device and projection system

Abstract

The invention discloses a light source device and a projection system. The light source device comprises a laser light source array, a dichroscope, a dynamic optical component, a fluorescence conversion component and a heat dissipation component. And the laser light source array emits laser to excite the fluorescence conversion part to emit fluorescence so as to realize emission of the three-primary-color light. The fluorescent conversion part is a fixed fluorescent conversion part, a driving element in a fluorescent powder wheel scheme is omitted in the fixed fluorescent conversion scheme, and the fluorescent conversion part is fixedly assembled in a light source device system, so that the system reliability can be greatly improved, mechanical movement is avoided, and the structural design size of the light source device can be reduced. And the original annular area of the fluorescent material is reduced to a small-area square or circular area, so that the use amount of the used fluorescent material is greatly reduced, and the material cost is reduced.

Description

Light source device and projection system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on June 29, 2022, with application number 202210755997.6, and invention name “A light source device and projection system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of projection display technology, and in particular to a light source device and a projection system. Background Art

[0004] Projection display is a technology that uses optical systems and projection space to magnify and display flat images on a screen by controlling the light source through flat image information. With the development of projection display technology, it has gradually been applied to business activities, conferences and exhibitions, scientific education, military command, traffic management, centralized monitoring, advertising and entertainment, and other fields. Its advantages, such as large display size and clear display, also meet the requirements of large-screen display.

[0005] Lasers are used in projection displays due to their high brightness, strong monochromaticity, and wide color gamut. Currently, laser projection systems commonly use high-energy lasers to excite a phosphor wheel to emit three colors of light. However, phosphor wheel solutions require more blue light return lenses. Furthermore, due to the heat dissipation and high-speed rotation required by the phosphor wheel, its size is relatively large, requiring strong structural support and a larger installation space. Consequently, the light source structure is relatively large. Under high-power laser irradiation, the phosphor wheel's heat cannot be dissipated quickly. Excessive temperatures reduce the conversion efficiency of the phosphor material, affecting optical output.

[0006] Summary of the Invention

[0007] This application first discloses a light source device, comprising:

[0008] A laser light source array, configured to emit laser light of a first wavelength band;

[0009] A dichroic mirror is provided on the light output path of the laser light source array; the dichroic mirror comprises a first portion and a second portion, the first portion is used to transmit light of a first wavelength band, and the second portion is used to reflect light of the first wavelength band and the second wavelength band;

[0010] A dynamic optical component is located on a side of the dichroic mirror facing away from the laser light source array; the dynamic optical component includes a reflective portion and a transmissive portion;

[0011] A fluorescence conversion component is located on a side of the dynamic optical component away from the dichroic mirror; the fluorescence conversion component is used to emit light of a second wavelength band under the excitation of light of the first wavelength band;

[0012] The heat dissipation component is located on a side of the fluorescence conversion component away from the dynamic optical component; the heat dissipation component is used to dissipate heat from the fluorescence conversion component.

[0013] The embodiment of the present application further discloses a projection system, comprising the light source device, the light valve modulation component and the projection lens of the above technical solution;

[0014] Among them, the light valve modulation component is located on the light output side of the light source device, and is used to modulate the incident light and then reflect it; the projection lens is located on the reflected light path of the light valve modulation component, and is used to image the output light of the light valve modulation component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings introduced below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] FIG1 is a schematic structural diagram of a light source device in the related art;

[0017] FIG2 is a side view of the phosphor wheel in FIG1 ;

[0018] FIG3 is a schematic diagram of a structure of a light source device according to an embodiment of the present application;

[0019] FIG4 is a schematic diagram of a planar structure of a dynamic optical component provided in an embodiment of the present application;

[0020] FIG5 is a schematic diagram of a cross-sectional structure of a fluorescence conversion component according to an embodiment of the present application;

[0021] FIG6 is a second schematic diagram of the cross-sectional structure of the fluorescence conversion component provided in an embodiment of the present application;

[0022] FIG7 is a schematic structural diagram of a heat dissipation component provided in an embodiment of the present application;

[0023] FIG8 is a second structural diagram of a light source device provided in an embodiment of the present application;

[0024] FIG9 is a schematic diagram of the spectral transmittance of the first filter portion provided in an embodiment of the present application;

[0025] FIG10 is a schematic diagram of the spectral transmittance of the second filter portion provided in an embodiment of the present application;

[0026] FIG11 is a third structural diagram of a light source device provided in an embodiment of the present application;

[0027] FIG12 is a fourth structural diagram of a light source device provided in an embodiment of the present application;

[0028] FIG13 is a fifth structural diagram of a light source device provided in an embodiment of the present application;

[0029] FIG14 is a sixth structural diagram of a light source device provided in an embodiment of the present application;

[0030] FIG15 is a second schematic diagram of the planar structure of the dynamic optical component provided in an embodiment of the present application;

[0031] FIG16 is a schematic diagram of the planar structure of a dynamic filtering component provided in an embodiment of the present application;

[0032] FIG17 is a schematic structural diagram of a projection system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present application more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in this application are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of this application. The drawings in this application are only used to illustrate relative position relationships and do not represent true proportions.

[0034] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present application more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in this application are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of this application. The drawings in this application are only used to illustrate relative position relationships and do not represent true proportions.

[0035] Projection display is a technology that uses optical systems and projection space to magnify and display flat images on a screen by controlling the light source through flat image information. With the development of projection display technology, it has gradually been applied to business activities, conferences and exhibitions, scientific education, military command, traffic management, centralized monitoring, advertising and entertainment, and other fields. Its advantages, such as large display size and clear display, also meet the requirements of large-screen display.

[0036] Lasers are used in the field of projection display due to their advantages such as high brightness, strong monochromaticity, and wide color gamut. Currently, laser projection systems generally use high-energy lasers to excite phosphor wheels to emit three-color light.

[0037] FIG1 is a schematic structural diagram of a light source device in related art.

[0038] As shown in Figure 1, the laser array 11 in the light source device emits a blue laser beam, which is focused and irradiated onto a phosphor wheel 12. Phosphor wheel 12 has a reflective portion and a transmissive portion, with the reflective portion coated with a phosphor layer. A first lens group 13a is positioned in front of phosphor wheel 12. This lens group 13a performs both focusing and collimating functions, converging the laser beam into a smaller spot.

[0039] When the phosphor wheel 12 is driven to rotate to the position of the reflective portion, the blue laser spot is irradiated onto the phosphor layer of the reflective portion of the phosphor wheel 12, stimulating fluorescence. The fluorescence is reflected by the substrate surface and collimated by the first lens group 13a, converted into a parallel beam and emitted. It is then reflected by the dichroic mirror 14 to the color filter component 15 for color filtering, and the red and green fluorescence bands are output sequentially.

[0040] When the phosphor wheel 12 is driven to rotate to the transmissive portion, the blue laser light is transmitted. After being focused by the first lens group 13a, the blue laser light diverges. Due to the reversible nature of the optical path, after reaching the transmissive portion of the phosphor wheel 12, the blue laser light must be collimated by the second lens group 13b, propagating as a parallel beam. The blue laser light passes through the optical circuit and finally enters the transmissive portion of the color filter component 15, outputting a blue laser wavelength band.

[0041] FIG2 is a schematic side view of the phosphor wheel in FIG1 .

[0042] As shown in Figure 2, phosphor wheel 12 includes a phosphor layer 121, a reflective substrate 122, and a drive component 123. Due to the high energy density of laser light, phosphor wheel 12 must be driven to rotate at high speed to prevent damage from the high-energy laser light. Furthermore, high-speed rotation is essential to maintain image quality.

[0043] Furthermore, to achieve minimal optical etendue and higher optical system efficiency, the laser spot area irradiated on the phosphor layer surface is also strictly controlled. Therefore, in certain lighting systems, the high-energy-density laser beam generates a significant amount of heat per unit time when irradiating the phosphor layer, causing the phosphor layer's temperature to rise rapidly and resulting in a decrease in phosphor conversion efficiency. Therefore, phosphor wheel 12 must be designed with a specific size to enhance its heat dissipation capacity, thereby ensuring a reasonable phosphor conversion efficiency.

[0044] As can be seen, current light source devices present the following problems: First, the light source system is complex, with numerous blue light circuit lenses. Furthermore, due to the heat dissipation and high-speed rotation requirements of the phosphor wheel, its size is large, requiring strong structural support and a large installation space. Consequently, the light source structure is relatively large. Second, because the phosphor cannot be directly applied to the phosphor wheel, it must be mixed with a carrier to secure the phosphor to the reflective substrate 122. Common carriers are currently silicone, glass, and ceramic. Silicone phosphors can withstand temperatures around 150°C, glass phosphors around 180°C, and ceramic phosphors around 250°C. Although ceramic phosphors offer the most superior performance, their attachment methods are still limited to using colloid bonding or mechanical structures to secure them to the reflective substrate. Under high-power laser irradiation, heat cannot be dissipated quickly, and excessively high temperatures can still reduce the conversion efficiency of the ceramic phosphor, affecting optical output. Soldering ceramic phosphors is technically difficult and costly. Third, current phosphor wheels have complex components and demanding production processes, resulting in high costs.

[0045] In view of this, an embodiment of the present application provides a light source device that adopts a fixed fluorescent conversion component and a new optical path and heat dissipation solution design to achieve stable optical performance and efficient output under a certain laser power.

[0046] FIG3 is one of the structural schematic diagrams of the light source device provided in an embodiment of the present application.

[0047] As shown in FIG3 , the light source device provided in the embodiment of the present application includes: a laser light source array 201 , a dichroic mirror 202 , a dynamic optical component 203 , a fluorescence conversion component 204 and a heat dissipation component 205 .

[0048] The laser light source array 201 is used to emit laser light in a first wavelength band. In the embodiment of the present application, the laser light source array 201 can emit blue laser light, and the first wavelength band can be 420nm to 470nm. The laser light source array 201 can be a laser array or a laser including multiple laser light sources, such as an MCL laser, without limitation.

[0049] The dichroic mirror 202 is located on the light output path of the laser light source array 201. The dichroic mirror is formed by coating a transparent plate on the surface using the thin film interference principle, and can enhance the transmission or reflection of light of different wavelength bands as needed.

[0050] In the embodiment of the present application, as shown in FIG3 , the dichroic mirror 202 includes a first portion 2021 and a second portion 2022. Different portions of the dichroic mirror 202 can utilize different coating processes to enhance the transmission or reflection of light in different wavelength bands. Specifically, the first portion 2021 is configured to transmit light in a first wavelength band, while the second portion 2022 is configured to reflect light in both the first and second wavelength bands.

[0051] It's worth noting that when the first or second portion of a dichroic mirror enhances the transmission of light within a specific wavelength band, it also enhances the reflection of light within other wavelength bands. Similarly, when the first or second portion enhances the reflection of light within a specific wavelength band, it also enhances the transmission of light within other wavelength bands. Therefore, while first portion 2021 transmits light within the first wavelength band, it also reflects light within the second wavelength band. Therefore, both first portion 2021 and second portion 2022 reflect light within the second wavelength band.

[0052] Specifically, the first-wavelength laser light emitted by the laser light source array 201 can pass through the first portion 2021 of the dichroic mirror 202 to excite the fluorescence conversion component 204. The second-wavelength light emitted by the fluorescence conversion component 204 can then be reflected by the first portion 2021 and the second portion 2022 of the dichroic mirror 202. The second-wavelength light emitted by the fluorescence conversion component 204 can be yellow light, and the second wavelength range can be 500nm to 630nm. Yellow light includes wavelengths of red and green light, and when combined with the filter component, red, green, and blue light can be emitted, thereby achieving the emission of three primary colors of light from the light source device.

[0053] The dynamic optical component 203 is located on the side of the dichroic mirror 202 away from the laser light source array 201. Figure 4 is one of the planar structural diagrams of the dynamic optical component provided in an embodiment of the present application.

[0054] As shown in Figure 4, the dynamic optical component includes a reflective portion 2031 and a transmissive portion 2032. The dynamic optical component 203 also includes a driving element that can drive the dynamic optical component 203 to move, allowing laser light to be incident on the reflective portion 2031 and the transmissive portion 2032 in a time-sharing manner. When laser light is incident on the reflective portion 2031, it is reflected by the dichroic mirror 202 and then reflected in a set direction by the dichroic mirror 202. When laser light is incident on the transmissive portion 2032, it is incident on the fluorescence conversion component 204, stimulating the fluorescence conversion component 204 to emit fluorescence. The stimulated fluorescence is then reflected by the dichroic mirror 202 and then reflected in a set direction by the dichroic mirror 202. This allows light of different colors to be sequentially output in the set direction, achieving the emission of three primary colors.

[0055] The dynamic optical component 203 can achieve switching between the reflective portion 2031 and the transmissive portion 2032 by means of rotation, linear reciprocating motion, or electrical conversion of light transmission. FIG4 illustrates the example of driving the dynamic optical component 203 by rotation. In actual applications, different motion methods can be used according to structural requirements, and this is not limited here.

[0056] As shown in FIG3 , a focusing lens group 206 is disposed between the dichroic mirror 202 and the dynamic optical component 203 to focus the laser light emitted from the dichroic mirror 202 and irradiate the dynamic optical component 203. The focusing lens group 206 includes at least one lens. In the embodiment of the present application, the focusing lens group 206 may include two lenses, which is not limited here.

[0057] The fluorescence conversion component 204 is located on the side of the dynamic optical component 203 away from the dichroic mirror 202. The fluorescence conversion component 204 is used to emit light of a second wavelength band under the excitation of light of the first wavelength band. The light of the first wavelength band can be blue light, and the light of the second wavelength band can be yellow light.

[0058] FIG5 is one of the schematic cross-sectional views of the fluorescence conversion component provided in an embodiment of the present application.

[0059] As shown in FIG. 5 , the fluorescence conversion component includes a fluorescence conversion layer 2041 , an anti-reflection layer 2042 and a reflection layer 2043 .

[0060] The fluorescence conversion layer 2041 serves as the core film layer of the fluorescence conversion component, emitting light in the second wavelength band under the stimulation of light in the first wavelength band. The fluorescence conversion layer can be made of a fluorescent ceramic formed by high-temperature sintering of YAG-based phosphor powder and ceramic material, a ceramic fluorescent material produced through a crystal growth process, or a single-crystal fluorescent material, without limitation. The thickness of the fluorescence conversion layer 2041 ranges from 0.05 mm to 1 mm.

[0061] Anti-reflection layer 2042 is located on the side of phosphor conversion layer 2041 facing dynamic optical component 203. Anti-reflection layer 2042 is used to increase the transmission of light in the first wavelength band. Specifically, a coating process is used to reduce reflection in the wavelength range of 420 nm to 470 nm, thereby increasing the transmission of blue laser light. The thickness of anti-reflection layer 2042 is between 0.5 μm and 10 μm, which is not limited here.

[0062] Reflective layer 2043 is located on the side of phosphor conversion layer 2041 facing away from anti-reflection layer 2042. Reflective layer 2043 is used to reflect light in the first and second wavelength bands. Specifically, reflective layer 2043 can be a dielectric film or a metal film. The thickness of reflective layer 2043 ranges from 0.5 μm to 10 μm, and it has a high reflectivity for visible light in the spectral range of 420 nm to 680 nm. To ensure reflection efficiency, reflective layer 2043 can be made of a dielectric film.

[0063] By arranging a transmittance-enhancing layer 2042 and a reflective layer 2043 on both sides of the fluorescence conversion layer 2041, the transmission of the laser in the first band can be increased to excite the fluorescence conversion layer, and the fluorescence in the second band stimulated by the fluorescence conversion layer can be reflected toward the dichroic mirror, so that more fluorescence can be utilized.

[0064] The fluorescent conversion component 204 employed in the embodiments of the present application is a fixed fluorescent conversion component. This solution eliminates the driving element of the phosphor wheel solution and is fixedly assembled within the light source system, significantly improving system reliability. The lack of mechanical movement reduces the structural design dimensions of the light source system. The fluorescent material is reduced from its original annular area to a small square or circular area, significantly reducing the amount of fluorescent material used and lowering material costs. Furthermore, without the dynamic limitations of high-speed rotation, the fixed fluorescent conversion component can provide centralized heat dissipation.

[0065] As shown in FIG3 , the light source device further includes a heat dissipation component 205 . The heat dissipation component 205 is located on a side of the fluorescence conversion component 204 away from the dynamic optical component 203 . The heat dissipation component is used to dissipate heat from the fluorescence conversion component.

[0066] In a specific implementation, the heat dissipation component 205 can be a metal heat dissipation device, an air cooling device, a liquid cooling device or a semiconductor cooling device to efficiently dissipate heat from the fluorescence conversion component 204 .

[0067] FIG6 is a second schematic diagram of the cross-sectional structure of the fluorescence conversion component provided in an embodiment of the present application.

[0068] In some embodiments, as shown in FIG. 6 , the fluorescence conversion component further includes a heat conducting layer 2044 and a connecting layer 2045 .

[0069] Thermal conductive layer 2044 is located on the side of reflective layer 2043 facing away from phosphor conversion layer 2041. The purpose of providing thermal conductive layer 2044 on the surface of reflective layer 2043 is to rapidly transfer heat generated by the laser excitation point to the entire phosphor conversion layer, thereby increasing heat dissipation. Thermal conductive layer 2044 can be made of a highly thermally conductive metal layer, such as copper or gold, with a thickness ranging from 0.1 μm to 1000 μm. For cost reasons, a copper layer with a thickness between 10 μm and 200 μm is also an option, but this is not a limitation.

[0070] The connecting layer 2045 is located on the side of the thermally conductive layer 2044 facing away from the reflective layer 2043 and is used to connect to the heat sink 205. When the fluorescent conversion component 204 is connected to the heat sink 205 using different connection methods, the connecting layer 2045 can be made of different materials. In some embodiments, the connecting layer 2045 can be connected to the heat sink 205 by mechanical fixation using thermal grease. In some embodiments, the connecting layer 2045 can be connected to the heat sink 205 by a colloid bonding or mechanical fixation method in which a colloid mixture is coated on the surface of a substrate, encapsulated on a carrier substrate by bonding, sintered and encapsulated by sintering ceramic fluorescent materials through high-temperature sintering, or connected to the heat sink 205 by welding.

[0071] In the embodiment of the present application, the structures of the connection layer 2045 and the heat dissipation component 205 are illustrated by taking welding as an example.

[0072] As shown in FIG. 6 , the connection layer 2045 includes a solder resist layer 20451 and a first solder layer 20452 .

[0073] The solder resist layer 20451 is located on the side of the thermal conductive layer 2044 facing away from the reflective layer 2043. The first solder layer 20452 is located on the side of the solder resist layer 20451 facing away from the thermal conductive layer 2044. The first solder layer 20452 is used for soldering the heat dissipation component 205. In the embodiment of the present application, the thermal conductive layer 2044 can be a copper layer, and a solder resist layer 20451 is plated on the copper layer. The solder resist layer 20451 can be a nickel layer or a titanium layer, with a nickel layer having higher thermal conductivity being selected. The thickness of the solder resist layer 20451 is between 0.1 μm and 5 μm. A first solder layer 20452 is provided at the bottom of the fluorescent conversion component. The first solder layer 20452 is a solderable metal layer, and a gold layer can be selected. The thickness of the solder resist layer 20451 is between 0.1 μm and 2 μm.

[0074] FIG7 is a schematic structural diagram of a heat dissipation component provided in an embodiment of the present application.

[0075] In some embodiments, as shown in FIG7 , the heat dissipation component may be a semiconductor refrigeration device, specifically comprising: a second welding layer 2051 , a first heat conducting plate 2052 , a second heat conducting plate 2053 , a plurality of semiconductor thermocouples 2054 , and a heat sink 2057 .

[0076] The second welding layer 2051 is located on a side close to the first welding layer 20452 and is used for welding to the first welding layer 20452. The second welding layer 2051 can be a nickel-gold layer or a titanium-platinum-gold layer and is connected to the fluorescence conversion component 204 by welding.

[0077] Semiconductor thermocouple 2054 is composed of a P-type semiconductor and an N-type semiconductor. This embodiment of the present application includes a semiconductor assembly consisting of multiple thermocouples. A highly conductive metal conductor 2055 connects the P-type and N-type semiconductors to form a complete series circuit. Metal conductor 2055 can be made of copper, aluminum, or other metal conductors. In this embodiment, copper is used.

[0078] A first thermally conductive sheet 2052 and a second thermally conductive sheet 2053 are provided on either side of the semiconductor thermocouple 2054. These sheets can be made of insulating ceramic sheets with good thermal conductivity. When powered, due to the principle of semiconductor refrigeration, the end closest to the fluorescence conversion component becomes the cooling end, while the other end becomes the heat dissipation end. Connecting the heat dissipation end to a heat sink 2057 effectively dissipates heat from the fluorescence conversion component.

[0079] In the embodiment of the present application, the thermal pad and the semiconductor thermocouple may be mechanically fixed together by applying thermal grease, or may be assembled together by welding with a gold-nickel layer plated on specific areas of the thermal pad and the semiconductor thermocouple, without limitation. The joint 2056 connecting the thermal pad and the metal conductor 2055 may be made of thermal grease, a weldable metal, or other materials, without limitation.

[0080] The radiator 2057 may be a metal heat sink, or may be an air cooling, liquid cooling or other heat dissipation device, which is not limited here.

[0081] The embodiment of the present application only uses a semiconductor refrigeration device as an example for explanation of the heat dissipation component. In specific implementation, the heat dissipation component can also use an air cooling device, a liquid cooling device or a metal heat dissipation device, etc., which can be selected according to actual needs and is not limited here.

[0082] FIG8 is a second structural schematic diagram of the light source device provided in an embodiment of the present application.

[0083] In some embodiments, as shown in FIG8 , laser light source array 201 includes a first laser light source group 2011 and a second laser light source group 2012, arranged side by side. First laser light source group 2011 may include multiple laser light sources, and second laser light source group 2012 may include multiple laser light sources. In the embodiment of the present application, first laser light source group 2011 and second laser light source group 2012 include identical laser light sources, both configured to emit laser light in the first wavelength band.

[0084] Correspondingly, the light source device further includes a first reflector 2071 and a second reflector 2072. The dichroic mirror 202 includes two first portions and two second portions, which are arranged alternately. The two first portions are 2021a and 2021b, and the two second portions are 2022a and 2022b.

[0085] The first reflector 2071 is located on the light-emitting side of the first laser light source group 2011 and is used to reflect the light emitted by the first laser light source group 2011 toward one of the two first sections, 2021a. The second reflector 2072 is located on the light-emitting side of the second laser light source group 2012 and is used to reflect the light emitted by the second laser light source group 2012 toward the other of the two first sections, 2021b.

[0086] The laser beams emitted by the first laser light source group 2011 and the second laser light source group 2012 can be regarded as a laser spot when they are incident on the corresponding reflectors. Therefore, the size of the first reflector 2071 and the second reflector 2072 needs to be larger than the size of the incident laser spot. By setting the first reflector 2071 and the second reflector 2072 to a suitable angle, the laser emitted by the first laser light source group 2011 can be reflected by the first reflector 2071 and then incident on the first part 2021a, and the laser emitted by the second laser light source group 2012 can be reflected by the second reflector 2072 and then incident on the first part 2021b.

[0087] The principle of how the light source device emits light of different wavelength bands according to a set timing is described in detail below.

[0088] As shown in FIG4 , the light-transmitting portion 2032 in the dynamic optical component 203 includes a first filter portion 2032r and a second filter portion 2032g; the light in the second wavelength band is yellow light, and the second wavelength band may include a first sub-band and a second sub-band; wherein the light in the first sub-band is red light, and the light in the second sub-band is green light.

[0089] The first filter portion 2032r is used to transmit light in the first band (blue) and the first sub-band (red), and reflect light in the second sub-band (green); the second filter portion 2032g is used to transmit light in the first band (blue) and the second sub-band (green), and reflect light in the first sub-band (red); the reflecting portion 2031 in the dynamic optical component 203 is used to reflect light in the first band (blue).

[0090] Specifically, the first filter section 2032r has a thickness ranging from 0.1 mm to 5 mm. Through coating, the first filter section has the properties shown in Figure 9: it transmits light between 420 nm and 470 nm, reflects light between 470 nm and 590 nm, and transmits light above 600 nm. This allows it to transmit blue light while filtering out red light. Furthermore, through multi-layer coating, it can transmit blue light at small angles, while blocking blue light at large angles due to reflection. The second filter section 2032g has a thickness ranging from 0.1 mm to 5 mm. Through coating, the second filter section has the properties shown in Figure 10: it transmits light between 420 nm and 470 nm, reflects light between 470 nm and 490 nm, transmits light between 500 nm and 590 nm, and reflects light above 600 nm. This allows it to transmit blue light while filtering out green light. Similarly, through multi-layer coating, it can transmit blue light at small angles while blocking blue light at large angles due to reflection. The thickness of the reflective portion 2031 is in the range of 0.1 mm to 5 mm, and can reflect light of 420 nm to 470 nm through coating, thereby reflecting blue light.

[0091] In a specific implementation, since blue laser light is used as excitation light and its energy is much higher than that of stimulated fluorescent light, the areas of the first filter portion 2032r and the second filter portion 2032g are both larger than the area of ​​the reflective portion 2031. However, the light source device generally requires higher-energy green light, so the area of ​​the second filter portion 2032g for filtering out green light can be larger than the area of ​​the first filter portion 2032r for filtering out red light.

[0092] As shown in FIG8 , the blue laser light emitted by the laser light source array 201 is reflected by the first reflector 2071 and the second reflector 2072 and then incident on the first parts 2021 a and 2021 b of the dichroic mirror. After being focused by the focusing lens group 206 , it is irradiated onto the dynamic optical component 203 .

[0093] When the dynamic optical component 203 moves to the reflecting portion 2031 , the blue laser light is incident on the reflecting portion 2031 and is reflected to the second portions 2022 a and 2022 b of the dichroic mirror, and is then reflected by the second portions 2022 a and 2022 b and emitted in a set direction.

[0094] When the dynamic optical component 203 moves to the first filter section 2032r, the blue laser passes through the first filter section 2032r and illuminates the fluorescence conversion component 204, exciting the fluorescence conversion component 204 to emit fluorescence (yellow light). The fluorescence is reflected by the reflective layer 2043 and filtered by the first filter section 2032r to obtain red fluorescence, which is emitted to the dichroic mirror 202 and reflected by the dichroic mirror to be emitted in the set direction.

[0095] When the dynamic optical component 203 moves to the second filter section 2032g, the blue laser passes through the second filter section 2032g and illuminates the fluorescence conversion component 204, exciting the fluorescence conversion component 204 to emit fluorescence (yellow light). The fluorescence is reflected by the reflective layer 2043 and filtered by the second filter section 2032g to obtain green fluorescence, which is emitted to the dichroic mirror 202 and reflected by the dichroic mirror to be emitted in the set direction.

[0096] As a result, the three primary color lights are emitted in a time-sequential manner for image display.

[0097] FIG11 is a third structural schematic diagram of the light source device provided in an embodiment of the present application.

[0098] As shown in FIG11 , the light source device further includes a collimating lens assembly 208 positioned between the laser light source array 201 and the dichroic mirror 202. Collimating lens assembly 208 is used to collimate and shape the laser light emitted by the laser light source array 201 to reduce the laser spot size. Collimating lens assembly 208 may include at least one lens. In the embodiment of the present application, collimating lens assembly 208 includes two lenses.

[0099] FIG12 is a fourth structural schematic diagram of the light source device provided in an embodiment of the present application.

[0100] As shown in Figure 12, the light source device also includes a light-homogenizing layer 209 located between the collimating lens group 208 and the dichroic mirror 202. The laser light emitted by the laser light source array 201 has high energy. To avoid laser speckle and prevent excessive laser energy from entering the fluorescence conversion component, which could reduce fluorescence conversion efficiency, a light-homogenizing layer 209 is provided in the optical path to homogenize the laser light. In specific implementations, a diffuser can be used for light-homogenizing layer 209, which is not limited here.

[0101] FIG13 is a fifth structural diagram of the light source device provided in an embodiment of the present application.

[0102] As shown in FIG. 13 , the light source device further includes: a converging lens group 210 located on the reflection path of the dichroic mirror 202 , and a light homogenizing component 211 located on a side of the converging lens group 210 away from the dichroic mirror 202 .

[0103] The three primary colors of light outputted sequentially by the dichroic mirror 202 need to be further homogenized before being incident on the display component. Therefore, a light homogenizing component 211 is provided at the light outlet of the light source device. A converging lens group 210 is provided before the light homogenizing component 211 to converge the light emitted by the dichroic mirror, so that as much light as possible is incident on the light homogenizing component 211 and utilized.

[0104] In a specific implementation, the light uniforming component 211 can be a light rod, a light pipe, etc.; the converging lens group 210 includes at least one lens, which is not limited here.

[0105] FIG14 is a sixth structural schematic diagram of the light source device provided in an embodiment of the present application.

[0106] In some embodiments, as shown in FIG14 , the light source device further includes a dynamic filtering component 212. Dynamic filtering component 212 is located in the reflection path of dichroic mirror 202, and specifically can be disposed between converging lens assembly 210 and light homogenizing component 211. Accordingly, dynamic optical component 203 can include only a reflective portion 2031 and a transmissive portion 2032, and no longer requires a filtering function.

[0107] FIG15 is a second schematic diagram of the planar structure of the dynamic optical component provided in an embodiment of the present application; FIG16 is a schematic diagram of the planar structure of the dynamic filtering component provided in an embodiment of the present application.

[0108] 15 , the dynamic optical component includes a reflective portion 2031 and a transmissive portion 2032, wherein the reflective portion 2031 is smaller than the transmissive portion 2032. The reflective portion 2031 is used to reflect laser light of a first wavelength band, and the transmissive portion 2032 is used to transmit stimulated emission of fluorescence of a second wavelength band.

[0109] Accordingly, as shown in Figure 16, the dynamic filtering component 212 includes a light-transmitting portion 2121, a third filter portion 2122r, and a fourth filter portion 2122g. In this embodiment of the present application, the light in the second wavelength band is yellow light, and the second wavelength band may include a first sub-band and a second sub-band; wherein the light in the first sub-band is red light, and the light in the second sub-band is green light.

[0110] The third filter portion 2122r is used to filter the light emitted in the first sub-band (red), and the fourth filter portion 2122g is used to filter the light emitted in the second sub-band (green). The transparent portion 2121 is used to transmit the light in the first sub-band.

[0111] The third filter 2122r and the fourth filter 2122g can be coated to increase the transmittance of light in a specific wavelength range and increase the reflection of light in other wavelength ranges. The transparent portion 2121 is made of a transparent homogenizing material with a certain diffusion effect, thereby having a certain homogenizing effect on blue laser light.

[0112] Since blue laser light is excitation light and its energy is much higher than that of stimulated fluorescent light, the areas of the third filter portion 2122r and the fourth filter portion 2122g are both larger than the area of ​​the light-transmitting portion 2121. Since light source devices generally require higher-energy green light, the area of ​​the fourth filter portion 2122g for filtering out green light can be larger than the area of ​​the third filter portion 2122r for filtering out red light.

[0113] Providing a dynamic filter component 212 in the light source device can simplify the design of the dynamic optical component 203. In practice, the dynamic filter component 212 and the dynamic optical component 203 need to be driven synchronously. The drawings in the embodiments of this application illustrate the dynamic filter component 212 and the dynamic optical component 203 as wheels. However, this invention is not limited to high-speed rotation. Other embodiments, including high-frequency movement and electrically converted light transmission, fall within the scope of this application.

[0114] Based on the same inventive concept, an embodiment of the present application further provides a projection system. FIG17 is a schematic structural diagram of the projection system provided in an embodiment of the present application.

[0115] 17 , the projection system includes any of the above light source devices 100 , a light valve modulation component 200 , and a projection lens 300 . The light valve modulation component 200 is located on the light emitting side of the light source device 100 , and the projection lens 300 is located on the reflected light path of the light valve modulation component 200 .

[0116] Light source device 100 utilizes a fixed fluorescent conversion component. This solution eliminates the driving element found in the phosphor wheel solution and is fixedly mounted within the light source system. This significantly improves system reliability and reduces the size of the light source device by eliminating mechanical motion. The fluorescent material is reduced from a circular area to a small square or circular area, significantly reducing the amount of fluorescent material used and lowering material costs. Furthermore, without the dynamic limitations of high-speed rotation, the fixed fluorescent conversion component can provide centralized heat dissipation.

[0117] The light valve modulation component 200 modulates and reflects incident light. In a specific implementation, the light valve modulation component 200 can be a digital micromirror device (DMD). The DMD surface includes thousands of tiny mirrors, each of which can be individually driven to deflect. By controlling the DMD's deflection angle, the reflected light is directed toward the projection lens 300.

[0118] The projection lens 300 is used to form an image of the output light of the light valve modulation component 200 , and the image formed by the projection lens 300 is used for projection.

[0119] According to the first inventive concept, the light source device includes: a laser light source array, a dichroic mirror, a dynamic optical component, a fluorescence conversion component and a heat dissipation component. The laser light source array emits laser light to excite the fluorescence conversion component to emit fluorescence to achieve the emission of three primary colors of light. The fluorescence conversion component adopts a fixed fluorescence conversion component. The fixed fluorescence conversion solution removes the driving element in the phosphor wheel solution and is fixedly assembled in the light source device system, which can greatly improve the reliability of the system. There is no mechanical movement and the structural design size of the light source device can be reduced. The fluorescent material is reduced from the original annular area to a small square or circular area, which greatly reduces the amount of fluorescent material used and reduces material costs. In addition, there is no dynamic limitation of high-speed rotation, and the fixed fluorescence conversion component can be centrally cooled. A simple optical path is used to achieve stable optical performance and efficient output under a certain laser power.

[0120] According to the second inventive concept, the laser light source array includes a first laser light source group and a second laser light source group arranged side by side. The first laser light source group may include multiple laser light sources, and the second laser light source group may include multiple laser light sources. The first laser light source group and the second laser light source group include the same laser light sources and are both configured to emit laser light of the first wavelength band.

[0121] According to the third inventive concept, a dichroic mirror is positioned in the light output path of the laser light source array. The dichroic mirror is formed by coating a transparent flat surface using the principle of thin-film interference. It can enhance the transmission or reflection of light in different wavelength bands as needed. The dichroic mirror comprises a first portion and a second portion. Different coating processes can be used to enhance the transmission or reflection of light in different wavelength bands. The first portion transmits light in the first wavelength band, while the second portion reflects light in the first and second wavelength bands.

[0122] According to the fourth inventive concept, the light source device further includes a first reflector and a second reflector. The dichroic mirror includes two first parts and two second parts, and the first parts and the second parts are arranged alternately. The first reflector is located on the light-emitting side of the first laser light source group, and the first reflector is used to reflect the output light of the first laser light source group toward one of the two first parts. The second reflector is located on the light-emitting side of the second laser light source group, and the second reflector is used to reflect the output light of the second laser light source group toward the other first part of the two first parts. By setting the first reflector and the second reflector to a suitable angle, the laser light emitted by the first laser light source group can be reflected by the first reflector and incident on one of the first parts, and the laser light emitted by the second laser light source group can be reflected by the second reflector and incident on the other first part.

[0123] According to the fifth inventive concept, the dynamic optical component includes a reflective portion and a transmissive portion, and the dynamic optical component also includes a driving element, which can drive the dynamic optical component to move, so that the laser can be incident on the reflective portion and the transmissive portion in a time-sharing manner. When the laser is incident on the reflective portion, the laser is reflected to the dichroic mirror, and then reflected by the dichroic mirror in a set direction. When the laser is incident on the transmissive portion, the laser can be incident on the fluorescence conversion component to stimulate the fluorescence conversion component to emit fluorescence, and the stimulated fluorescence is then reflected to the dichroic mirror, and then reflected by the dichroic mirror in a set direction. In this way, different colors of light can be output sequentially in the set direction to achieve the emission of three primary colors of light. The dynamic optical component can achieve the switching between the reflective portion and the transmissive portion by means of rotation, linear reciprocating motion, or electrical conversion of light transmission.

[0124] According to a sixth inventive concept, the light of the first wavelength band is blue light, the second wavelength band includes a first sub-band and a second sub-band, the light of the first sub-band is red light, and the light of the second sub-band is green light.

[0125] According to the seventh inventive concept, the fluorescence conversion component includes a fluorescence conversion layer, an anti-reflection layer, and a reflective layer. The fluorescence conversion layer is configured to emit light in a second wavelength band under excitation by light in a first wavelength band. The anti-reflection layer is configured to enhance the transmission of light in the first wavelength band, and the reflective layer is configured to reflect light in both the first and second wavelength bands. By providing the anti-reflection layer and the reflective layer on either side of the fluorescence conversion layer, the transmission of laser light in the first wavelength band can be increased to excite the fluorescence conversion layer. Furthermore, the fluorescence in the second wavelength band stimulated by the fluorescence conversion layer can be reflected toward the dichroic mirror, thereby utilizing more of the fluorescence.

[0126] According to the eighth inventive concept, the fluorescence conversion component further includes a heat-conducting layer and a connecting layer. The heat-conducting layer rapidly conducts heat generated by the laser excitation point to the entire fluorescence conversion layer sheet, thereby increasing heat dissipation capacity. The connecting layer is used to connect to the heat dissipation component. When the fluorescence conversion component is connected to the heat dissipation component using different connection methods, the connecting layer can be made of different materials.

[0127] According to the ninth invention, the heat dissipation component can be a metal heat dissipation device, an air cooling device, a liquid cooling device or a semiconductor refrigeration device to efficiently dissipate heat from the fluorescent conversion component.

[0128] According to the tenth invention, the connection layer includes: a solder resist layer and a first welding layer. The heat dissipation component can be a semiconductor refrigeration device. The semiconductor refrigeration device includes: a second welding layer, a first heat conducting plate, a second heat conducting plate, a plurality of semiconductor thermocouples and a heat sink. The second welding layer is used for welding with the first welding layer. The semiconductor thermocouple is composed of a P-type semiconductor and an N-type semiconductor, a semiconductor collection composed of a plurality of thermocouples. The P-type semiconductor and the N-type semiconductor are connected to form a complete series circuit by a metal conductor with good conductivity. A first heat conducting plate and a second heat conducting plate are provided on both sides of the semiconductor thermocouple. When the power is connected, due to the principle of semiconductor refrigeration, the end close to the fluorescence conversion component is the cooling end, and the other end is the heat release end. Connecting a heat sink to the heat release end can efficiently dissipate heat from the fluorescence conversion component. The heat sink can be a metal heat sink, or a heat dissipation device such as air cooling or liquid cooling, which is not limited here.

[0129] According to the eleventh inventive concept, the light source device also includes: a focusing lens group located between the dichroic mirror and the dynamic optical component, a collimating lens group located between the laser light source array and the dichroic mirror, a light homogenizing layer located between the collimating lens group and the dichroic mirror, a converging lens group located on the reflection path of the dichroic mirror, and a light homogenizing component located on the side of the converging lens group away from the dichroic mirror.

[0130] According to the twelfth inventive concept, the light-transmitting portion of the dynamic optical component includes a first filter portion and a second filter portion. The first filter portion is configured to transmit light within a first wavelength band and a first sub-band, and reflect light within a second sub-band; the second filter portion is configured to transmit light within the first wavelength band and the second sub-band, and reflect light within the first sub-band; and the reflective portion of the dynamic optical component is configured to reflect light within the first wavelength band.

[0131] According to the thirteenth inventive concept, the light source device further includes a dynamic optical filter component located in the reflection path of the dichroic mirror. The dynamic optical filter component includes a transmissive portion and a reflective portion. The dynamic optical filter component includes a light-transmitting portion, a third light-filtering portion, and a fourth light-filtering portion. The third light-filtering portion is configured to filter light emitted within the first sub-band, and the fourth light-filtering portion is configured to filter light emitted within the second sub-band. The light-transmitting portion is configured to transmit light within the first sub-band. Providing the dynamic optical filter component in the light source device can simplify the design of the dynamic optical component.

[0132] According to the fourteenth inventive concept, a projection system comprises any of the above light source devices, a light valve modulation component and a projection lens, wherein the light valve modulation component is located on the light output side of the light source device, and the projection lens is located on the reflected light path of the light valve modulation component.

[0133] Although multiple embodiments of the present application have been described, once those skilled in the art understand the basic inventive concepts, they may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if such modifications and variations fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations.

Claims

1. A light source device, characterized in that: include: A laser light source array, configured to emit laser light of a first wavelength band; A dichroic mirror is provided on the light output path of the laser light source array; the dichroic mirror comprises a first portion and a second portion, the first portion is used to transmit light of the first wavelength band, and the second portion is used to reflect light of the first wavelength band and the second wavelength band; a dynamic optical component, located on a side of the dichroic mirror facing away from the laser light source array; the dynamic optical component comprises a reflective portion and a transmissive portion; a fluorescence conversion component, located on a side of the dynamic optical component away from the dichroic mirror; the fluorescence conversion component is configured to emit light of the second wavelength band under the excitation of the light of the first wavelength band; The heat dissipation component is located on a side of the fluorescence conversion component away from the dynamic optical component; the heat dissipation component is used to dissipate heat from the fluorescence conversion component.

2. The light source device according to claim 1, wherein The laser light source array includes a first laser light source group and a second laser light source group arranged side by side; The light source device further includes a first reflector and a second reflector; the first reflector is located on the light-emitting side of the first laser light source group, and the second reflector is located on the light-emitting side of the second laser light source group; The dichroic mirror includes two first parts and two second parts, and the first parts and the second parts are arranged alternately; the first reflector is used to reflect the output light of the first laser light source group toward one of the two first parts, and the second reflector is used to reflect the output light of the second laser light source group toward the other first part of the two first parts.

3. The light source device according to claim 1, wherein The fluorescence conversion component includes: a fluorescent conversion layer, configured to emit light of the second wavelength band under the excitation of the light of the first wavelength band; an anti-reflection layer, located on a side of the fluorescent conversion layer facing the dynamic optical component; the anti-reflection layer is used to increase the transmittance of light in the first wavelength band; The reflective layer is located on a side of the fluorescent conversion layer away from the anti-reflection layer; the reflective layer is used to reflect light in the first wavelength band and the second wavelength band.

4. The light source device according to claim 3, wherein The fluorescence conversion component further includes: a heat-conducting layer, located on a side of the reflective layer away from the fluorescent conversion layer; a connecting layer, located on a side of the heat-conducting layer away from the reflecting layer; the connecting layer is used to connect the heat dissipation component; Wherein, the connection layer includes: a solder resist layer, located on a side of the heat conducting layer facing away from the reflective layer; The first welding layer is located on a side of the solder resist layer away from the heat conducting layer; the first welding layer is used for welding the heat dissipation component.

5. The light source device according to claim 4, wherein The heat dissipation component adopts a metal heat dissipation device, an air cooling device, a liquid cooling device or a semiconductor refrigeration device; Wherein, the semiconductor refrigeration device comprises: a second welding layer, located on a side close to the first welding layer; the second welding layer is used for welding with the first welding layer; a first heat conducting sheet, located on a side of the second welding layer facing away from the first welding layer; a second heat conducting plate, located on a side of the first heat conducting plate facing away from the second welding layer; a plurality of semiconductor thermocouples, located between the first heat conducting plate and the second heat conducting plate; the plurality of semiconductor thermocouples are connected in series; The heat sink is located on a side of the second heat conducting plate facing away from the first heat conducting plate.

6. The light source device according to claim 1, wherein The light-transmitting portion in the dynamic optical component includes a first filter portion and a second filter portion; the second wavelength band includes a first sub-wavelength band and a second sub-wavelength band; The first filtering portion is used to transmit light in the first band and the first sub-band, and reflect light in the second sub-band; the second filtering portion is used to transmit light in the first band and the second sub-band, and reflect light in the first sub-band; the reflecting portion in the dynamic optical component is used to reflect light in the first band.

7. The light source device according to claim 1, wherein Also includes: a dynamic filtering component located on the reflection path of the dichroic mirror; the dynamic filtering component comprises a third filtering portion, a fourth filtering portion, and a light-transmitting portion; the second wavelength band comprises a first sub-band and a second sub-band; The third filter section is used to filter the light emitted in the first sub-band, and the fourth filter section is used to filter the light emitted in the second sub-band; the light-transmitting section in the dynamic filter component is used to transmit the light in the first sub-band.

8. The light source device according to claim 6 or 7, wherein: The light in the first wavelength band is blue light, the light in the first sub-wavelength band is red light, and the light in the second sub-wavelength band is green light.

9. The light source device according to any one of claims 1 to 7, wherein: Also includes: a collimating lens group, located between the laser light source array and the dichroic mirror; uniform light layer; Located between the collimating lens group and the dichroic mirror; a focusing lens group, located between the dichroic mirror and the dynamic optical component; a converging lens group, located on the reflection path of the dichroic mirror; The light homogenizing component is located on a side of the converging lens group away from the dichroic mirror.

10. A projection system, characterized in that: comprising the light source device according to any one of claims 1 to 9, a light valve modulation component and a projection lens; The light valve modulation component is located on the light output side of the light source device, and is used to modulate the incident light and then reflect it; the projection lens is located on the reflected light path of the light valve modulation component, and is used to image the output light of the light valve modulation component.

Images