Light source device and projection system

Abstract

The application discloses a light source device and a projection system, which comprise a laser light source array, a dichroic mirror, a dynamic optical component, a fluorescent conversion component and a heat dissipation component. The fluorescent conversion component adopts a fixed fluorescent conversion component, which can greatly improve the system reliability, has no mechanical movement and can reduce the structure design size of the light source device. The fluorescent material is changed from the original annular area to a small square or circular area, which greatly reduces the use amount of the fluorescent material and reduces the material cost. In addition, the fixed fluorescent conversion component can be centrally cooled without the dynamic limitation of high-speed rotation. In the three primary colors emitted by the light source device, the red light is mixed light of red fluorescent light and red laser light, and the green light is mixed light of green fluorescent light and green laser light. Since the laser has a large color gamut, the color performance of the projection system can be improved.

Description

Technical Field

[0001] This invention relates to the field of projection display technology, and more particularly to a light source device and a projection system. Background Technology

[0002] Projection display is a technology that uses planar image information to control a light source, and utilizes an optical system and projection space to magnify and display the image on a projection screen. With the development of projection display technology, projection displays are gradually being applied to business activities, conferences and exhibitions, scientific education, military command, traffic management, centralized monitoring, and advertising and entertainment. Its advantages, such as large display size and clear display, are also suitable for the requirements of large-screen displays.

[0003] Lasers are widely used in 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. In phosphor wheel solutions, there are more blue light loop lenses, and due to the need for heat dissipation and high-speed rotation, the phosphor wheel is relatively large, requiring strong structural support and ample installation space, resulting in a large light source structure. Under high-power laser irradiation, the phosphor wheel cannot dissipate heat quickly, and excessively high temperatures reduce the conversion efficiency of the phosphor material, affecting optical output. Summary of the Invention

[0004] In some embodiments of the present invention, 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 includes a laser source emitting three colors of laser light. The laser excites the fluorescence conversion component to emit fluorescence, which, combined with the corresponding color of laser light, achieves the emission of the three primary colors of light. The fluorescence conversion component is a fixed type. This fixed fluorescence conversion scheme eliminates the driving element in the phosphor wheel scheme and is fixedly assembled in the light source device system, significantly improving system reliability. The absence of mechanical movement reduces the structural design size of the light source device. The fluorescent material is reduced from a ring-shaped area to a small square or circular region, significantly reducing the amount of fluorescent material used and lowering material costs. Furthermore, the absence of dynamic limitations due to high-speed rotation allows for centralized heat dissipation of the fixed fluorescence conversion component. Among the three primary colors emitted by the light source device, the red light is a mixture of red fluorescence and red laser light, and the green light is a mixture of green fluorescence and green laser light. Because laser light has a large color gamut, it can improve the color performance of the projection system.

[0005] In some embodiments of the present invention, the laser source array includes a first laser source group and a second laser source group arranged side by side. The first laser source group includes a plurality of first laser sources for emitting laser light in a first wavelength band, and the second laser source group includes a plurality of second laser sources for emitting laser light in a second wavelength band and a plurality of third laser sources for emitting laser light in a third wavelength band.

[0006] In some embodiments of the present invention, the dichroic mirror includes a first part, a second part, a third part, and a fourth part arranged side by side in sequence. The second part is located on the light output path of the first laser light source group, and the fourth part is located on the light output path of the second laser light source group. The second part is used to transmit light of the first wavelength band, the fourth part is used to transmit light of the second and third wavelength bands, and the first and third parts are used to reflect light of the first, second, and third wavelength bands.

[0007] In some embodiments of the present invention, the dynamic optical component includes a reflective portion and a transmissive portion. The dynamic optical component also includes a driving element that can drive the dynamic optical component to move, thereby allowing laser light to be incident on the reflective and transmissive portions in a time-division manner. When the laser light is incident on the reflective portion, it is reflected to a dichroic mirror and then reflected in a predetermined direction by the dichroic mirror. When the laser light is incident on the transmissive portion, it can be incident on a fluorescence conversion component to excite the fluorescence conversion component to emit fluorescence. The emitted fluorescence is then reflected to a dichroic mirror and then reflected in a predetermined direction by the dichroic mirror. The dynamic optical component can switch between the reflective and transmissive portions by means of rotation, linear reciprocating motion, or electro-conversion transmission.

[0008] In some embodiments of the present invention, the light-transmitting portion of the dynamic optical component includes a first filter portion and a second filter portion. The first filter portion is used to transmit light of a first and second wavelength band and reflect light of a third wavelength band; the second filter portion is used to transmit light of both the first and third wavelength bands and reflect light of the second wavelength band; the reflective portion of the dynamic optical component is used to reflect light of the first wavelength band.

[0009] In some embodiments of the present invention, the areas of the first filter portion and the second filter portion are both larger than the area of ​​the reflective portion, and the area of ​​the second filter portion is larger than the area of ​​the first filter portion.

[0010] In some embodiments of the present invention, the light in the first band is blue light, the light in the second band is red light, and the light in the third band is green light.

[0011] In some embodiments of the present invention, 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 is used to reflect the emitted light from the first laser light source group toward the second part. The second reflector is located on the light-emitting side of the second laser light source group and is used to reflect the emitted light from the second laser light source group toward the fourth part. By setting the first and second reflectors at appropriate angles, the laser emitted from the first laser light source group can be reflected by the first reflector and then incident on the second part, and the laser emitted from the second laser light source group can be reflected by the second reflector and then incident on the fourth part.

[0012] In some embodiments of the present invention, the fluorescence conversion component includes a fluorescence conversion layer, an antireflection layer, and a reflective layer. The fluorescence conversion layer is used to emit second and third band light when excited by light of the first band. The antireflection layer is used to increase the transmission of light of the first band, and the reflective layer is used to reflect light of the first, second, and third bands. By providing an antireflection layer and a reflective layer on both sides of the fluorescence conversion layer, the antireflection layer can increase the transmission of laser light of the first band to excite the fluorescence conversion layer, while simultaneously reflecting the incident second and third band laser light towards a dichroic mirror. The reflective layer reflects the fluorescence of the second and third bands emitted by the fluorescence conversion layer towards the dichroic mirror, thereby utilizing more fluorescence.

[0013] In some embodiments of the present invention, the fluorescence conversion component further includes a thermally conductive layer and a connecting layer. The thermally conductive layer rapidly conducts the heat generated at the laser excitation point to the entire fluorescence conversion layer sheet, thereby increasing heat dissipation capacity. The connecting layer is used to connect 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.

[0014] In some embodiments of the present invention, the heat dissipation component may 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 phosphor conversion component.

[0015] In some embodiments of the present invention, the connection layer includes a solder resist layer and a first solder layer. The heat dissipation component can employ a semiconductor cooling device. The semiconductor cooling device includes a second solder layer, a first thermally conductive sheet, a second thermally conductive sheet, multiple semiconductor thermocouples, and a heat sink. The second solder layer is used for soldering to the first solder layer. The semiconductor thermocouple is composed of P-type and N-type semiconductors, forming a semiconductor assembly of multiple thermocouples. The P-type and N-type semiconductors are connected in series by a highly conductive metal conductor. A first thermally conductive sheet and a second thermally conductive sheet are disposed on both sides of the semiconductor thermocouple. When a power source is connected, due to the semiconductor cooling principle, the end closer to the fluorescence conversion component is the cooling end, and the other end is the heat dissipation end. Connecting a heat sink to the heat dissipation end allows for efficient heat dissipation of the fluorescence conversion component. The heat sink can be a metal heat sink, or a cooling device such as air cooling or liquid cooling; no limitation is made here.

[0016] In some embodiments of the present invention, the light source device further 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.

[0017] In some embodiments of the present invention, the projection system includes any of the above-described light source devices, a light valve modulation component, and a projection lens. The light valve modulation component is located on the light-emitting side of the light source device, and the projection lens is located on the reflected light path of the light valve modulation component. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a light source device in related technologies;

[0020] Figure 2 for Figure 1 A side view of the phosphor wheel structure;

[0021] Figure 3 Figure 3 This is a schematic diagram of the structure of a laser source device in related technologies;

[0022] Figure 4 This is one of the structural schematic diagrams of the light source device provided in the embodiments of the present invention;

[0023] Figure 5This is a schematic diagram of the planar structure of the dynamic optical component provided in an embodiment of the present invention;

[0024] Figure 6 This is one of the schematic cross-sectional views of the fluorescence conversion component provided in an embodiment of the present invention;

[0025] Figure 7 This is a second schematic diagram of the cross-sectional structure of the fluorescence conversion component provided in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the heat dissipation component provided in an embodiment of the present invention;

[0027] Figure 9 A schematic diagram of the spectral transmittance of the first filter section provided in an embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram of the spectral transmittance of the second filter section provided in an embodiment of the present invention;

[0029] Figure 11 This is a second schematic diagram of the structure of the light source device provided in an embodiment of the present invention;

[0030] Figure 12 This is the third schematic diagram of the structure of the light source device provided in the embodiment of the present invention;

[0031] Figure 13 This is the fourth schematic diagram of the structure of the light source device provided in the embodiment of the present invention;

[0032] Figure 14 This is a schematic diagram of the projection system provided in an embodiment of the present invention. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction in the present invention are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of the present invention. The accompanying drawings of the present invention are for illustrative purposes only and do not represent actual proportions.

[0034] Projection display is a technology that uses planar image information to control a light source, and utilizes an optical system and projection space to magnify and display the image on a projection screen. With the development of projection display technology, projection displays are gradually being applied to business activities, conferences and exhibitions, scientific education, military command, traffic management, centralized monitoring, and advertising and entertainment. Its advantages, such as large display size and clear display, are also suitable for the requirements of large-screen displays.

[0035] Lasers are used in the field of projection display because of 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 colors of light.

[0036] Figure 1 This is a schematic diagram of the structure of a light source device in related technologies.

[0037] like Figure 1 As shown, the laser array 11 in the light source device emits a blue laser beam, which is focused onto the phosphor wheel 12. The phosphor wheel 12 has a reflective part and a transmissive part, and the reflective part is coated with a phosphor layer. A first lens group 13a is arranged in front of the phosphor wheel 12. The first lens group 13a has the dual function of focusing and collimating, which enables the laser beam to be focused into a smaller spot.

[0038] When the phosphor wheel 12 is rotated to the position of the reflective part, the blue laser spot irradiates the phosphor layer of the reflective part of the phosphor wheel 12, which excites 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 fluorescent bands are output sequentially.

[0039] When the phosphor wheel 12 is rotated to the position of the transmission section, the blue laser is transmitted. After being focused by the first lens group 13a, the blue laser will diverge. According to the reversible nature of the optical path, after the blue laser reaches the transmission section of the phosphor wheel 12, it needs to be collimated by the second lens group 13b and propagated as a parallel beam. The blue laser finally enters the transmission section of the color filter component 15 through the optical circuit and outputs the blue laser band.

[0040] Figure 2 for Figure 1 A side view of the phosphor wheel.

[0041] like Figure 2 As shown, the phosphor wheel 12 includes a phosphor layer 121, a reflective substrate 122, and a driving component 123. Due to the high energy density of the laser, in practical implementation, the phosphor wheel 12 needs to be driven to rotate at high speed to prevent damage from the high-energy laser. Furthermore, the phosphor wheel 12 must rotate at high speed to meet the imaging requirements.

[0042] On the other hand, to achieve a smaller optical extension and higher optical system efficiency, the laser spot area irradiating the phosphor layer surface is also strictly controlled. Therefore, in a given illumination system, the high-energy-density laser beam generates a large amount of heat per unit time when irradiating the phosphor layer, causing the phosphor layer temperature to rise rapidly and resulting in a decrease in fluorescence conversion efficiency. Therefore, the phosphor wheel 12 must be designed with specific dimensions to improve its heat dissipation capacity, thereby ensuring that the fluorescence conversion efficiency remains within a reasonable range.

[0043] Therefore, current light source devices suffer from the following problems: First, the light source system is complex, with numerous blue light loop lenses. Furthermore, due to the need for heat dissipation and high-speed rotation of the phosphor wheel, its size is large, requiring strong structural support and ample installation space, resulting in a large light source structure. Second, because phosphor cannot be directly applied to the phosphor wheel, it needs to be mixed with a carrier to fix the phosphor onto the reflective substrate 122. Currently, common carriers include silicone, glass, and ceramic. Silicone phosphor materials can withstand temperatures around 150℃, glass phosphor materials around 180℃, and ceramic phosphor materials around 250℃. Although ceramic phosphor materials have the best performance, their fixing methods are still limited to adhesive bonding or mechanical structures to fix them to the reflective substrate. Under high-power laser irradiation, the heat cannot be dissipated quickly, and excessively high temperatures will still reduce the conversion efficiency of the ceramic phosphor material, affecting optical output. Installing ceramic phosphor materials by welding is technically difficult and costly. Third, the current phosphor wheel components are complex, and the manufacturing process requires high precision, leading to high costs.

[0044] Figure 3 This is a schematic diagram of the structure of a laser source device in related technologies.

[0045] like Figure 3 As shown, the blue laser array 11' and the green laser array 12' are arranged vertically, and the green laser array 12' and the red laser array 13' are arranged side by side. The green laser and the blue laser are combined by the beam combiner 14', and after the green laser and the blue laser are combined, they are combined again by the red laser through the beam combiner 14'. Finally, the three-color laser beams are emitted in the same direction, and after passing through the shaping optical path, they become a parallel beam and are emitted.

[0046] Currently, with the continuous improvement of the optical efficiency of red and green lasers, pure color laser light source products are constantly developing, but compared with laser-excited phosphor light source solutions, they still have the problem of laser speckle.

[0047] In view of this, embodiments of the present invention provide a light source device that employs a fixed phosphor conversion component and a new optical path and heat dissipation scheme design to achieve stable and efficient optical performance output under a certain laser power, thereby improving the color performance capability of the projection system.

[0048] Figure 4 This is one of the structural schematic diagrams of the light source device provided in the embodiments of the present invention.

[0049] like Figure 4 As shown, the light source device provided in this embodiment of the invention 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.

[0050] The laser source array 201 includes a first laser source group 2011 and a second laser source group 2012 arranged side by side; the first laser source group 2011 includes a plurality of first laser sources for emitting lasers in a first band, and the second laser source group 2012 includes a plurality of second laser sources for emitting lasers in a second band and a plurality of third laser sources for emitting lasers in a third band.

[0051] In this embodiment of the invention, the light in the first band is blue light, the light in the second band is red light, and the light in the third band is green light.

[0052] The laser source array 201 can be a laser array or a laser that includes multiple laser sources, such as an MCL laser; there is no limitation here.

[0053] The dichroic mirror 202 includes a first part 2022b, a second part 2021a, a third part 2022a, and a fourth part 2021b arranged side-by-side. The second part 2021a is located in the light-emitting path of the first laser light source group 2011 and is used to transmit light of the first wavelength band. The fourth part 2021b is located in the light-emitting path of the second laser light source group 2012 and is used to transmit light of the second and third wavelength bands. Thus, the blue laser emitted from the first laser light source group can be emitted into the dynamic optical component 203 through the second part 2021a, and the red or green laser emitted from the second laser light source group can be emitted into the dynamic optical component 203 through the fourth part 2021b. The first part 2022b and the third part 2022a are used to reflect the light of the first, second, and third wavelength bands. The fluorescence emitted by the fluorescence conversion component 204, the reflected red / green laser, and the reflected blue laser can all be reflected in a set direction by the first part 2022b and the third part 2022a, thereby realizing the emission of the three primary colors of light.

[0054] The dynamic optical component 203 is located on the side of the dichroic mirror 202 that is away from the laser source array 201. Figure 5 This is a schematic diagram of the planar structure of a dynamic optical component provided in an embodiment of the present invention.

[0055] like Figure 5 As shown, the dynamic optical component 203 includes a reflective section 2031 and a transmissive section 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 section 2031 and the transmissive section 2032 in a time-division manner. When the laser light is incident on the reflective section 2031, it is reflected to the dichroic mirror 202, and then reflected in a predetermined direction by the dichroic mirror 202. When the laser light is incident on the transmissive section 2032, it can be incident on the fluorescence conversion component 204, stimulating the fluorescence conversion component 204 to emit fluorescence. The emitted fluorescence is then reflected to the dichroic mirror 202, and then reflected in a predetermined direction by the dichroic mirror 202. Thus, different colors of light can be sequentially output in the predetermined direction, achieving the emission of three primary colors of light.

[0056] The dynamic optical component 203 can switch between the reflective part 2031 and the transmissive part 2032 by means of rotation, linear reciprocating motion or electro-conversion light transmission. Figure 5 The example given is the use of rotation to drive the dynamic optical component 203. In practical applications, different motion methods can be used according to structural requirements, and no limitation is made here.

[0057] like Figure 4 As shown, a focusing lens group 206 is disposed between the dichroic mirror 202 and the dynamic optical component 203, which can focus the laser emitted from the dichroic mirror 202 onto the dynamic optical component 203. The focusing lens group 206 includes at least one lens. In this embodiment of the invention, the focusing lens group 206 may include two lenses, which is not limited here.

[0058] The fluorescence conversion component 204 is located on the side of the dynamic optical component 203 opposite to the dichroic mirror 202. The fluorescence conversion component 204 is used to emit light in the second and third wavelength bands when excited by light in the first wavelength band. The light in the first wavelength band can be blue light, the light in the second wavelength band can be red light, and the light in the third wavelength band can be green light.

[0059] Figure 6 This is one of the cross-sectional structural schematic diagrams of the fluorescence conversion component provided in an embodiment of the present invention.

[0060] like Figure 6 As shown, the fluorescence conversion component includes: a fluorescence conversion layer 2041, an antireflection layer 2042, and a reflective layer 2043.

[0061] The fluorescence conversion layer 2041, as the core film layer in the fluorescence conversion component, is used to emit second-band light under the excitation of first-band light. The fluorescence conversion layer can be made of fluorescent ceramics formed by high-temperature sintering of YAG matrix phosphors and ceramic materials, ceramic fluorescent materials manufactured through crystal growth processes, or single-crystal fluorescent materials; no limitation is made here. The thickness of the fluorescence conversion layer 2041 is between 0.05 mm and 1 mm.

[0062] The antireflection layer 2042 is located on the side of the fluorescence conversion layer 2041 facing the dynamic optical component 203. The antireflection layer 2042 is used to increase the transmission of light in the first wavelength band. Specifically, by employing a coating process, the antireflection layer 2042 can reduce reflection in the spectral range of 420nm to 470nm, thereby increasing the transmission of blue laser light. The thickness of the antireflection layer 2042 is between 0.5μm and 10μm, and is not limited here.

[0063] The reflective layer 2043 is located on the side of the fluorescence conversion layer 2041 facing away from the antireflection layer 2042. The reflective layer 2043 is used to reflect light in the first and second wavelength bands. Specifically, the reflective layer 2043 can be a dielectric film or a metal film, and its thickness is between 0.5 μm and 10 μm. It has high reflectivity for visible light in the spectral range of 420 nm to 680 nm. To ensure reflection efficiency, the reflective layer 2043 can be made of dielectric material.

[0064] By providing an antireflection layer 2042 and a reflective layer 2043 on both sides of the fluorescence conversion layer 2041, the transmission of the first-band laser can be increased to excite the fluorescence conversion layer, and the fluorescence emitted by the fluorescence conversion layer in the second and third bands can be reflected in the direction of the dichroic mirror so that more fluorescence can be utilized.

[0065] The fluorescence conversion component 204 used in this embodiment of the invention is a fixed fluorescence conversion component. This fixed fluorescence conversion scheme eliminates the driving element found in the phosphor wheel scheme, and is fixedly assembled in the light source device system, significantly improving system reliability. The absence of mechanical movement allows for a reduction in the structural design size of the light source device. The fluorescent material is reduced from a ring-shaped area to a small square or circular region, significantly reducing the amount of fluorescent material used and lowering material costs. Furthermore, the absence of dynamic limitations due to high-speed rotation allows for centralized heat dissipation of the fixed fluorescence conversion component.

[0066] like Figure 4 As shown, the light source device also includes a heat dissipation component 205, which is located on the 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.

[0067] In practical 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 fluorescent conversion component 204.

[0068] Figure 7 This is a second schematic diagram of the cross-sectional structure of the fluorescence conversion component provided in an embodiment of the present invention.

[0069] In some embodiments, such as Figure 7 As shown, the fluorescence conversion component also includes a thermally conductive layer 2044 and a connecting layer 2045.

[0070] The thermally conductive layer 2044 is located on the side of the reflective layer 2043 opposite to the phosphor conversion layer 2041. The thermally conductive layer 2044 is placed on the surface of the reflective layer 2043 to rapidly conduct the heat generated at the laser excitation point to the entire phosphor conversion layer sheet, thereby increasing heat dissipation capacity. The thermally conductive layer 2044 can be a metal layer with high thermal conductivity, including copper or gold, with a thickness ranging from 0.1 μm to 1000 μm. Due to cost considerations, a copper layer solution is optional, with a thickness between 10 μm and 200 μm; no specific limitation is made here.

[0071] The connecting layer 2045 is located on the side of the thermally conductive layer 2044 opposite to the reflective layer 2043, and is used to connect the heat dissipation component 205. When the phosphor conversion component 204 is connected to the heat dissipation component 205 using different connection methods, the connecting layer 2045 can be made of different materials. In some embodiments, the connecting layer 2045 can be mechanically fixed to the heat dissipation component 205 using thermally conductive silicone grease. In some embodiments, the connecting layer 2045 can be encapsulated using a method of adhesive bonding or mechanical fixing by coating a colloid mixture onto the substrate surface, encapsulated on a carrier substrate by bonding, encapsulated by sintering ceramic phosphor material at high temperature, or connected to the heat dissipation component 205 by welding.

[0072] This embodiment of the invention uses welding as an example to illustrate the structure of the connecting layer 2045 and the heat dissipation component 205.

[0073] like Figure 7 As shown, the connection layer 2045 includes: a solder resist layer 20451 and a first solder layer 20452.

[0074] A solder resist layer 20451 is located on the side of the thermally conductive layer 2044 facing away from the reflective layer 2043, and a first solder layer 20452 is located on the side of the solder resist layer 20451 facing away from the thermally conductive layer 2044. The first solder layer 20452 is used to solder the heat dissipation component 205. In this embodiment of the invention, the thermally conductive layer 2044 can be a copper layer, and a solder resist layer 20451 is plated on top of the copper layer. The solder resist layer 20451 can be a nickel layer or a titanium layer, and a nickel layer with higher thermal conductivity can be selected, with a thickness 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, which can be a gold layer, with a thickness between 0.1 μm and 2 μm.

[0075] Figure 8 This is a schematic diagram of the heat dissipation component provided in an embodiment of the present invention.

[0076] In some embodiments, such as Figure 8 As shown, the heat dissipation component can employ a semiconductor cooling device. Specifically, the semiconductor cooling device includes: a second bonding layer 2051, a first heat-conducting sheet 2052, a second heat-conducting sheet 2053, multiple semiconductor thermocouples 2054, and a heat sink 2057.

[0077] The second welding layer 2051 is located on the side close to the first welding layer 20452, and is used to weld to the first welding layer 20452. The second welding layer 2051 can be a nickel-gold layer or a titanium-platinum layer, and is connected to the fluorescent conversion component 204 by welding.

[0078] The semiconductor thermocouple 2054 is composed of P-type semiconductors and N-type semiconductors. Embodiments of this invention include a semiconductor assembly consisting of multiple thermocouples. The P-type and N-type semiconductors are connected in series by a highly conductive metal conductor 2055. The metal conductor 2055 can be copper, aluminum, or other metal conductors; in this embodiment, copper can be used.

[0079] The semiconductor thermocouple 2054 has a first heat-conducting plate 2052 and a second heat-conducting plate 2053 on both sides. The first heat-conducting plate 2052 and the second heat-conducting plate 2053 can be made of insulating and thermally conductive ceramic sheets. When a power source is connected, due to the semiconductor cooling principle, the end closer to the fluorescence conversion component is the cooling end, and the other end is the heat-dissipating end. A heat sink 2057 is connected to the heat-dissipating end to efficiently dissipate heat from the fluorescence conversion component.

[0080] In this embodiment of the invention, the heat-conducting sheet and the semiconductor thermocouple can be mechanically fixed together by applying thermal grease, or they can be assembled together by plating a gold-nickel layer in specific areas of the heat-conducting sheet and the semiconductor thermocouple and then welding them together; no limitation is made here. The joint 2056 connecting the heat-conducting sheet and the metal conductor 2055 can be made of thermal grease, solderable metal, or other materials; no limitation is made here.

[0081] The 2057 heatsink can use metal heat sinks, or it can use air cooling, liquid cooling or other heat dissipation devices, and there is no limitation here.

[0082] The embodiments of the present invention are only illustrated by taking the use of a semiconductor cooling device as an example for heat dissipation components. In specific implementations, heat dissipation components may also use air cooling devices, liquid cooling devices, or metal heat dissipation devices, etc., selected according to actual needs, and are not limited here.

[0083] like Figure 4 As shown, the light source device also includes a first reflector 2071 and a second reflector 2072. 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 emitted light from the first laser light source group 2011 toward the second part 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 emitted light from the second laser light source group 2012 toward the fourth part 2021b.

[0084] The laser beams emitted from the first laser source group 2011 and the second laser source group 2012 can be regarded as a laser spot when 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 from the first laser source group 2011 can be reflected by the first reflector 2071 and then incident on the second part 2021a, and the laser emitted from the second laser source group 2012 can be reflected by the second reflector 2072 and then incident on the fourth part 2021b.

[0085] The principle of how the light source emits light of different wavelengths according to a set timing sequence will be explained in detail below.

[0086] like Figure 5 As shown, the light-transmitting portion 2032 in the dynamic optical component 203 includes a first filter portion 2032r and a second filter portion 2032g.

[0087] The first filter 2032r transmits light in the first band (blue) and the second band (red) and reflects light in the third band (green); the second filter 2032g transmits light in the first band (blue) and the third band (green) and reflects light in the second band (red); the reflector 2031 in the dynamic optical component 203 reflects light in the first band (blue).

[0088] Specifically, the thickness of the first filter element 2032r ranges from 0.1mm to 5mm, and the first filter element is made to have the following properties through coating: Figure 9 The properties shown are: transmits light in the 420nm-470nm range, reflects light in the 470nm-580nm range, transmits light in the 590nm-630nm range, and reflects light above 640nm, thus enabling the transmission of blue light and the filtering of red light. Furthermore, through multi-layer coating, small-angle blue light can be transmitted, while large-angle blue light, after reflection, cannot pass through. The thickness of the second filter element 2032g ranges from 0.1mm to 5mm, and the coating gives the second filter element the properties of... Figure 10 The properties shown are: it transmits light in the 420nm-470nm range, reflects light in the 470nm-490nm range, transmits light in the 500nm-590nm range, and reflects light above 600nm, thus enabling it to transmit blue light and filter out green light. Similarly, through multi-layer coating, it can also achieve the transmission of small-angle blue light, while large-angle blue light, after reflection, cannot pass through. The thickness of the reflective part 2031 ranges from 0.1mm to 5mm, and through coating, it can reflect light in the 420nm-470nm range, thereby reflecting blue light.

[0089] In practical implementation, since the blue laser is the excitation light, its energy is much higher than that of stimulated emission fluorescence. Therefore, the areas of both the first filter section 2032r and the second filter section 2032g are larger than the area of ​​the reflective section 2031. Since the light source device typically requires high-energy green light, the area of ​​the second filter section 2032g used to filter out green light can be larger than the area of ​​the first filter section 2032r used to filter out red light.

[0090] like Figure 4 As shown, when the dynamic optical component 203 moves to the reflector 2031, the first laser source group 2011 is activated. The blue laser emitted from the first laser source group 2011 is reflected by the first reflector 2071 and then incident on the second part 2021a of the dichroic mirror. After being focused by the focusing lens group 206, it illuminates the reflector 2031 of the dynamic optical component 203. The blue laser incident on the reflector 2031 is reflected to the third part 2022a of the dichroic mirror and then emitted in a set direction after reflection.

[0091] When the dynamic optical component 203 moves to the first filter section 2032r, the second laser source in the first laser source group 2011 and the second laser source group 2012 is simultaneously activated. The blue laser emitted from the first laser source group 2011 is reflected by the first reflecting mirror 2071 and then enters the second part 2021a of the dichroic mirror. After being focused by the focusing lens group 206, it illuminates the first filter section 2032r of the dynamic optical component 203. The red laser emitted from the second laser source group 2012 is reflected by the second reflecting mirror 2072 and then enters the fourth part 2021b of the dichroic mirror. After being focused by the focusing lens group 206, it illuminates the first filter section 2032r of the dynamic optical component 203.

[0092] Blue laser light passes through the first filter 2032r and irradiates 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 then filtered by the first filter 2032r to obtain red fluorescence, which is then emitted towards the dichroic mirror 202 and reflected back into the designated direction. The antireflection layer 2042 has an antireflection effect on blue light and a reflective effect on red and green light. The red laser light, reflected by the antireflection layer 2042, passes through the first filter 2032r and is emitted towards the dichroic mirror 202, where it is reflected back and emitted together with the red fluorescence into the designated direction.

[0093] When the dynamic optical component 203 moves to the second filter section 2032g, the third laser source in the first laser source group 2011 and the second laser source group 2012 is simultaneously activated. The blue laser emitted from the first laser source group 2011 is reflected by the first reflecting mirror 2071 and then enters the second part 2021a of the dichroic mirror. After being focused by the focusing lens group 206, it illuminates the second filter section 2032g of the dynamic optical component 203. The green laser emitted from the second laser source group 2012 is reflected by the second reflecting mirror 2072 and then enters the fourth part 2021b of the dichroic mirror. After being focused by the focusing lens group 206, it illuminates the second filter section 2032g of the dynamic optical component 203.

[0094] Blue laser light passes through the second filter 2032g and irradiates 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 then filtered by the second filter 2032g to obtain green fluorescence, which is then emitted towards the dichroic mirror 202. After reflection, it is emitted in a set direction. The green laser light is reflected by the antireflective layer 2042 and then passes through the second filter 2032g to be emitted towards the dichroic mirror 202. After reflection, it is emitted in a set direction along with the red fluorescence.

[0095] Thus, the three primary colors of light are emitted sequentially for image display. In the light source device provided in this embodiment of the invention, the emitted red light is a mixture of red fluorescence and red laser light, and the emitted green light is a mixture of green fluorescence and green laser light. Since laser has a large color gamut, it can improve the color performance of the projection system.

[0096] Figure 11 This is a second schematic diagram of the structure of the light source device provided in an embodiment of the present invention.

[0097] like Figure 11 As shown, the light source device further includes a collimating lens group 208 located between the laser light source array 201 and the dichroic mirror 202. The collimating lens group 208 is used to collimate and shape the laser emitted from the laser light source array 201 to reduce the laser spot size. The collimating lens group 208 may include at least one lens; in this embodiment of the invention, the collimating lens group 208 includes two lenses.

[0098] Figure 12 This is the third schematic diagram of the structure of the light source device provided in the embodiment of the present invention.

[0099] like Figure 12 As shown, the light source device also includes a homogenizing layer 209 located between the collimating lens group 208 and the dichroic mirror 202. The laser emitted from the laser source array 201 has high energy. To avoid laser speckle problems and to prevent excessively high laser energy incident on the fluorescence conversion component, which would reduce fluorescence conversion efficiency, a homogenizing layer 209 is provided in the optical path to homogenize the laser. In specific implementations, the homogenizing layer 209 can be a diffuser sheet; this is not limited to this embodiment.

[0100] Figure 13 The fourth schematic diagram of the light source device provided in the embodiment of the present invention.

[0101] like Figure 13 As shown, the light source device also includes: a converging lens group 210 located on the reflection path of the dichroic mirror 202, and a light-diffusing component 211 located on the side of the converging lens group 210 away from the dichroic mirror 202.

[0102] The three primary colors of light output 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, and a converging lens group 210 is provided in front of the light homogenizing component 211 to converge the light emitted from the dichroic mirror, so that as much light as possible is incident on the light homogenizing component 211 and utilized.

[0103] In specific implementation, the light-diffusing component 211 can be a light rod, light guide, etc.; the converging lens group 210 includes at least one lens, which is not limited here.

[0104] Based on the same inventive concept, embodiments of the present invention also provide a projection system. Figure 14 This is a schematic diagram of the projection system provided in an embodiment of the present invention.

[0105] like Figure 14 As shown, the projection system includes any of the aforementioned 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.

[0106] The light source device 100 employs a fixed phosphor conversion component. This fixed phosphor conversion scheme eliminates the driving element found in the phosphor wheel scheme, and its fixed assembly within the light source device system significantly improves system reliability. The absence of mechanical movement allows for a reduction in the structural dimensions of the light source device. The phosphor material is reduced from a ring-shaped area to a small square or circular region, drastically reducing the amount of phosphor material used and lowering material costs. Furthermore, the absence of dynamic limitations due to high-speed rotation allows for centralized heat dissipation of the fixed phosphor conversion component. Of the three primary colors emitted by the light source device, the red light is a mixture of red fluorescence and red laser light, and the green light is a mixture of green fluorescence and green laser light. Since laser light has a wide color gamut, it enhances the color performance of the projection system.

[0107] The light valve modulation component 200 is used to modulate and reflect the incident light. In a specific implementation, the light valve modulation component 200 can be a digital micromirror device (DMD). The surface of the DMD includes thousands of tiny mirrors, each of which can be individually driven to deflect. By controlling the deflection angle of the DMD, the reflected light is incident on the projection lens 300.

[0108] The projection lens 300 is used to image the light emitted from the light valve modulation component 200, and the image after passing through the projection lens 300 is used for projection imaging.

[0109] 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 includes a laser source emitting three colors of laser light. The laser excites the fluorescence conversion component, which emits fluorescence that combines with the corresponding color of laser light to achieve the emission of the three primary colors. The fluorescence conversion component is a fixed type, which eliminates the driving element in the phosphor wheel scheme and is fixedly assembled in the light source device system, significantly improving system reliability. The absence of mechanical movement allows for a reduction in the structural design size of the light source device. The fluorescent material is reduced from a ring-shaped area to a small square or circular region, significantly reducing the amount of fluorescent material used and lowering material costs. Furthermore, the absence of dynamic limitations due to high-speed rotation allows for centralized heat dissipation of the fixed fluorescence conversion component. Among the three primary colors emitted by the light source device, the red light is a mixture of red fluorescence and red laser light, and the green light is a mixture of green fluorescence and green laser light. Since laser light has a large color gamut, it can improve the color performance of the projection system.

[0110] According to the second inventive concept, the laser source array includes a first laser source group and a second laser source group arranged side by side. The first laser source group includes multiple first laser sources for emitting laser light in a first wavelength band, and the second laser source group includes multiple second laser sources for emitting laser light in a second wavelength band and multiple third laser sources for emitting laser light in a third wavelength band.

[0111] According to the third inventive concept, the dichroic mirror includes a first part, a second part, a third part, and a fourth part arranged side by side. The second part is located on the light output path of the first laser light source group, and the fourth part is located on the light output path of the second laser light source group. The second part is used to transmit light of the first wavelength band, the fourth part is used to transmit light of the second and third wavelength bands, and the first and third parts are used to reflect light of the first, second, and third wavelength bands.

[0112] According to the fourth inventive concept, the dynamic optical component includes a reflective part and a transmissive part. The dynamic optical component also includes a driving element that can drive the dynamic optical component to move, thereby allowing laser light to be incident on the reflective and transmissive parts in a time-division manner. When the laser light is incident on the reflective part, it is reflected to a dichroic mirror, and then reflected in a predetermined direction by the dichroic mirror. When the laser light is incident on the transmissive part, it can be incident on a fluorescence conversion component to excite the fluorescence conversion component to emit fluorescence. The emitted fluorescence is then reflected to a dichroic mirror, and then reflected in a predetermined direction by the dichroic mirror. The dynamic optical component can switch between the reflective and transmissive parts by means of rotation, linear reciprocating motion, or electro-conversion transmission.

[0113] According to the fifth inventive concept, the first band of light is blue light, the second band of light is red light, and the third band of light is green light.

[0114] According to the sixth inventive concept, 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 is used to reflect the emitted light from the first laser light source group toward the second part. The second reflector is located on the light-emitting side of the second laser light source group and is used to reflect the emitted light from the second laser light source group toward the fourth part. By setting the first and second reflectors at appropriate angles, the laser emitted from the first laser light source group can be reflected by the first reflector and then incident on the second part, and the laser emitted from the second laser light source group can be reflected by the second reflector and then incident on the fourth part.

[0115] According to the seventh inventive concept, the fluorescence conversion component includes a fluorescence conversion layer, an antireflection layer, and a reflective layer. The fluorescence conversion layer is used to emit second and third band light when excited by light of the first band. The antireflection layer is used to increase the transmission of light of the first band, and the reflective layer is used to reflect light of the first, second, and third bands. By providing the antireflection layer and the reflective layer on both sides of the fluorescence conversion layer, the antireflection layer can increase the transmission of the first band laser to excite the fluorescence conversion layer, while simultaneously reflecting the incident second and third band lasers towards a dichroic mirror. The reflective layer reflects the fluorescence of the second and third bands emitted by the fluorescence conversion layer towards the dichroic mirror, thereby utilizing more fluorescence.

[0116] According to the eighth inventive concept, the fluorescence conversion component further includes a thermally conductive layer and a connecting layer. The thermally conductive layer rapidly conducts the heat generated at the laser excitation point to the entire fluorescence conversion layer sheet, thereby increasing heat dissipation capacity. The connecting layer is used to connect 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.

[0117] According to the ninth inventive concept, the heat dissipation component 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 fluorescent conversion component.

[0118] According to the tenth inventive concept, the connecting layer includes a solder resist layer and a first solder layer. The heat dissipation component can employ a semiconductor cooling device. The semiconductor cooling device includes a second solder layer, a first heat-conducting sheet, a second heat-conducting sheet, multiple semiconductor thermocouples, and a heat sink. The second solder layer is used for soldering to the first solder layer. The semiconductor thermocouple is composed of P-type and N-type semiconductors, forming a semiconductor assembly of multiple thermocouples. The P-type and N-type semiconductors are connected in series by a highly conductive metal conductor. A first heat-conducting sheet and a second heat-conducting sheet are disposed on both sides of the semiconductor thermocouple. When a power source is connected, due to the semiconductor cooling principle, the end closer to the fluorescence conversion component becomes the cooling end, and the other end becomes the heat dissipation end. A heat sink is connected to the heat dissipation end to efficiently dissipate heat from the fluorescence conversion component. The heat sink can be a metal heat sink, or it can be a heat dissipation device such as air cooling or liquid cooling; no limitation is made here.

[0119] According to the eleventh inventive concept, the light source device further 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-diffusing 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-diffusing component located on the side of the converging lens group away from the dichroic mirror.

[0120] According to the twelfth inventive concept, the projection system includes any of the aforementioned light source devices, a light valve modulation component, and a projection lens. The light valve modulation component is located on the light-emitting side of the light source device, and the projection lens is located on the reflected light path of the light valve modulation component.

[0121] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0122] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A light source device, characterized in that, include: A laser source array; the laser source array includes a first laser source group and a second laser source group arranged side by side; the first laser source group includes a plurality of first laser sources for emitting lasers in a first wavelength band, and the second laser source group includes a plurality of second laser sources for emitting lasers in a second wavelength band and a plurality of third laser sources for emitting lasers in a third wavelength band; A dichroic mirror; the dichroic mirror includes a first part, a second part, a third part, and a fourth part arranged side by side in sequence, the second part being located on the light output path of the first laser light source group, and the fourth part being located on the light output path of the second laser light source group; the second part is used to transmit light of the first wavelength band, the fourth part is used to transmit light of the second wavelength band and the third wavelength band, and the first part and the third part are used to reflect light of the first wavelength band, the second wavelength band, and the third wavelength band; A dynamic optical component is located on the side of the dichroic mirror opposite to the laser source array. The dynamic optical component includes a reflective part and a transmissive part. The transmissive part includes a first filter part and a second filter part. The first filter part is used to transmit light of the second wavelength band and light of the first wavelength band at a small angle transmitted by the dichroic mirror, and to reflect light of the third wavelength band and light of the first wavelength band at a large angle reflected by the fluorescence conversion component. The second filter part is used to transmit light of the third wavelength band and light of the first wavelength band at a small angle transmitted by the dichroic mirror, and to reflect light of the second wavelength band and light of the first wavelength band at a large angle reflected by the fluorescence conversion component. A fluorescence conversion component is located on the side of the dynamic optical component facing away from the dichroic mirror; the fluorescence conversion component is used to emit light of the second and third wavelengths and reflect it to the dichroic mirror under the excitation of light of the first wavelength band; A heat dissipation component is located on the side of the fluorescence conversion component opposite to the dynamic optical component; the heat dissipation component is used to dissipate heat from the fluorescence conversion component.

2. The light source device as described in claim 1, characterized in that, Also includes: The first reflecting mirror is located on the light-emitting side of the first laser source group; The first reflector is used to reflect the emitted light from the first laser source group toward the second part; The second reflector is located on the light-emitting side of the second laser source group; the second reflector is used to reflect the emitted light from the second laser source group toward the fourth part.

3. The light source device as described in claim 1, characterized in that, The fluorescence conversion component includes: A fluorescence conversion layer is used to emit light in the second and third bands when excited by light in the first band; An antireflection layer is located on the side of the fluorescence conversion layer facing the dynamic optical component; the antireflection layer is used to increase the transmittance of light in the first wavelength band; A reflective layer is located on the side of the fluorescence conversion layer opposite to the antireflective layer; the reflective layer is used to reflect light from the first band, the second band, and the third band.

4. The light source device as described in claim 3, characterized in that, The fluorescence conversion component further includes: A thermally conductive layer is located on the side of the reflective layer opposite to the fluorescence conversion layer; A connecting layer is located on the side of the thermally conductive layer opposite to the reflective layer; the connecting layer is used to connect the heat dissipation component. The connection layer includes: A solder resist layer is located on the side of the thermally conductive layer that is away from the reflective layer; The first welding layer is located on the side of the solder resist layer that is away from the heat-conducting layer; the first welding layer is used to weld the heat dissipation component.

5. The light source device as described in claim 4, characterized in that, The heat dissipation component adopts a metal heat dissipation device, an air cooling device, a liquid cooling device, or a semiconductor refrigeration device; The semiconductor cooling device includes: The second welding layer is located on the side close to the first welding layer; the second welding layer is used to weld to the first welding layer. The first heat-conducting sheet is located on the side of the second welding layer opposite to the first welding layer; The second heat-conducting sheet is located on the side of the first heat-conducting sheet that is away from the second welding layer; Multiple semiconductor thermocouples are located between the first heat-conducting plate and the second heat-conducting plate; the multiple semiconductor thermocouples are connected in series with each other; The heat sink is located on the side of the second heat-conducting plate opposite to the first heat-conducting plate.

6. The light source device as described in claim 1, characterized in that, The reflective element in the dynamic optical component is used to reflect light in the first wavelength band.

7. The light source device as described in claim 6, characterized in that, The areas of both the first filter portion and the second filter portion are larger than the area of ​​the reflective portion; the area of ​​the second filter portion is larger than the area of ​​the first filter portion.

8. The light source device as described in claim 6, characterized in that, The first band of light is blue light, the second band of light is red light, and the third band of light is green light.

9. The light source device according to any one of claims 1 to 8, characterized in that, Also includes: A collimating lens group is located between the laser source array and the dichroic mirror; homogenizing layer; Located between the collimating lens group and the dichroic mirror; A focusing lens group is located between the dichroic mirror and the dynamic optical component; A converging lens group is located on the reflection path of the dichroic mirror; The light-diffusing component is located on the side of the converging lens group that is away from the dichroic mirror.

10. A projection system, characterized in that, Includes the light source device, light valve modulation component, and projection lens as described in any one of claims 1 to 9; The light valve modulation component is located on the light-emitting side of the light source device, and is used to modulate and reflect the incident light; the projection lens is located on the reflected light path of the light valve modulation component, and is used to image the emitted light of the light valve modulation component.

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