Light source device and projection system

Abstract

A light source device (100) and a projection system belong to the technical field of photoelectricity. The light source device (100) comprises a first laser light source group (1), a second laser light source group (2), a dichroscope (3), a fluorescence conversion device (4) and an emergent part (5), the first laser light source group (1) emits laser of a first wave band, and the second laser light source group (2) emits laser of a second wave band and a third wave band; the dichroscope (3) is located on the light-emitting side of the laser light source set, and the fluorescence conversion device (4) and the emergent part (5) are located on the light-emitting side of the dichroscope (3). The dichroscope (3) is used for emitting laser of all wave bands, the fluorescence conversion device (4) can generate target fluorescence under excitation of the laser of the first wave band and reflect the target fluorescence to the emitting piece (5) through the dichroscope (3), and the target fluorescence can provide fluorescence of the second wave band and fluorescence of the third wave band. The light source device (100) comprises at least three light beams which are correspondingly emitted by the emitting part (5) according to the time sequence: the laser of the first wave band is independently emitted, the laser of the second wave band and the fluorescent light are combined and emitted, and the laser of the third wave band and the fluorescent light are combined and emitted. Therefore, the display effect of the projection picture is effectively improved.

Description

Light source device and projection system

[0001] This application claims priority to Chinese patent application No. 202210756023.X, filed on June 29, 2022, with invention name “A light source device and projection system”, and priority to Chinese patent application No. 202210891564.3, filed on July 27, 2022, with invention name “Projection light source and projection equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optoelectronic technology, and in particular to a light source device and a projection system. Background Art

[0003] With the development of optoelectronic technology, the requirements for the picture display effect of the projection system are getting higher and higher.

[0004] The light source of a projection system can be a pure laser or a fluorescent light source composed of laser-excited fluorescent materials. Lasers are commonly used as light sources in projection systems because they can emit laser light of high purity and brightness. Lasers directly emit red, green, and blue laser light, which are mixed and modulated to form the projection image.

[0005] However, the laser light emitted by the laser has a high coherence, which makes the projection image formed by the laser light more prone to speckle effect, while the projection light source using fluorescent light source is slightly worse in color gamut performance, so the brightness improvement is likely to encounter bottlenecks.

[0006] Public content

[0007] On one hand, the present application provides a light source device, which includes: a first laser light source group, a second laser light source group, a dichroic mirror, a fluorescence converter, and an output element;

[0008] The first laser light source group includes a first laser light source, which is used to emit laser light of a first wavelength band; the second laser light source group includes at least a second laser light source and a third laser light source, which is used to emit laser light of a second wavelength band; and the third laser light source is used to emit laser light of a third wavelength band.

[0009] The dichroic mirror is located on the light-emitting side of the first laser light source group and the second laser light source group, and the fluorescence conversion device and the emission element are respectively located on the light-emitting side of the dichroic mirror;

[0010] The dichroic mirror is used to emit the laser light of the first wavelength band, the laser light of the second wavelength band, and the laser light of the third wavelength band. The fluorescence conversion device can generate target fluorescence under the excitation of the laser light of the first wavelength band. The target fluorescence is reflected by the dichroic mirror to the emission element. The target fluorescence can provide fluorescence of the second wavelength band and fluorescence of the third wavelength band.

[0011] The light source device is configured to include at least three light beams, which are emitted by the emitting element according to a timing sequence. The at least three light beams include: the laser of the first wavelength band is emitted alone, the laser of the second wavelength band and the fluorescence of the second wavelength band are emitted together, and the laser of the third wavelength band and the fluorescence of the third wavelength band are emitted together.

[0012] On the other hand, a projection system is provided, comprising: any one of the above light source devices, a light valve modulation component, and a projection lens;

[0013] 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 before emitting it;

[0014] The projection lens is located on the outgoing light path of the light valve modulation component, and is used to project the outgoing light of the light valve modulation component into an image. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described 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 any creative work.

[0016] FIG1 is a schematic structural diagram of a first exemplary light source device provided in an embodiment of the present application;

[0017] FIG2 is a schematic structural diagram of an exemplary fluorescence conversion device in the form of a fluorescence wheel provided in an embodiment of the present application;

[0018] FIG3 is a schematic structural diagram of a second exemplary light source device provided in an embodiment of the present application;

[0019] FIG4 is a schematic structural diagram of a third exemplary light source device provided in an embodiment of the present application;

[0020] FIG5 is a diagram showing the relationship between the transmittance of a dichroic mirror and the wavelength of light provided in an embodiment of the present application;

[0021] FIG6 is a graph showing the relationship between the transmittance of a third lens and the wavelength of light provided in an embodiment of the present application;

[0022] FIG7 is a graph showing the relationship between the transmittance of light and the wavelength of light provided by another third lens according to an embodiment of the present application;

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

[0024] FIG9 is a schematic structural diagram of an exemplary color filter wheel provided in an embodiment of the present application;

[0025] FIG10 is a schematic structural diagram of an exemplary second laser light source group provided in an embodiment of the present application;

[0026] FIG11 is a schematic structural diagram of another exemplary second laser light source group provided in an embodiment of the present application;

[0027] FIG12 is a schematic structural diagram of another exemplary second laser light source group provided in an embodiment of the present application;

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

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

[0030] FIG15 is a schematic structural diagram of a seventh exemplary light source device provided in an embodiment of the present application;

[0031] FIG16 is a schematic structural diagram of an eighth exemplary light source device provided in an embodiment of the present application;

[0032] FIG17 is a schematic structural diagram of a ninth exemplary light source device provided in an embodiment of the present application;

[0033] FIG18 is a schematic diagram of a planar structure of a dynamic optical component provided in an embodiment of the present application;

[0034] FIG19 is a schematic diagram of a cross-sectional structure of another exemplary fluorescence conversion component provided in an embodiment of the present application;

[0035] FIG20 is a second schematic cross-sectional view of another exemplary fluorescence conversion component provided in an embodiment of the present application;

[0036] FIG21 is a schematic structural diagram of a heat dissipation component provided in an embodiment of the present application;

[0037] FIG22 is a schematic diagram of the spectral transmittance of the first filter portion provided in an embodiment of the present application;

[0038] FIG23 is a schematic diagram of the spectral transmittance of the second filter portion provided in an embodiment of the present application;

[0039] FIG24 is a schematic structural diagram of a tenth exemplary light source device provided in an embodiment of the present application;

[0040] FIG25 is a schematic structural diagram of an eleventh exemplary light source device provided in an embodiment of the present application;

[0041] FIG26 is a schematic structural diagram of a twelfth exemplary light source device provided in an embodiment of the present application;

[0042] FIG27 is a schematic structural diagram of a thirteenth exemplary light source device provided in an embodiment of the present application;

[0043] FIG28 is a schematic structural diagram of another exemplary fluorescence conversion device provided in an embodiment of the present application;

[0044] FIG29 is a schematic structural diagram of a fourteenth exemplary light source device provided in an embodiment of the present application;

[0045] FIG30 is a schematic structural diagram of an exemplary projection system provided in an embodiment of the present application.

[0046] The accompanying drawings respectively represent: 100, light source device; 1, first laser light source group; 2, second laser light source group; 21, light-emitting chip; 22, heat sink; 23, reflecting prism; 24, conductive pin; 3, dichroic mirror; 311, first area; 312, second area; 321, first part; 322, second part; 323, third part; 324, fourth part; 4, fluorescence conversion device; 411, fluorescence conversion area; 412, laser emission area; 413, light selection layer; 421, dynamic optical component; 4211, reflecting part; 4212, transmitting part; 42121, first filtering part; 42122, second filtering part; 422, fluorescence conversion component; 4221, fluorescence conversion layer; 4222, anti-reflection layer; 4223, reflecting layer; 4224, heat conducting layer; 4225, connecting layer; 4 2251, solder mask layer; 42252, first solder layer; 423, heat dissipation component; 4231, second solder layer; 4232, first heat conducting plate; 4233, second heat conducting plate; 4234, semiconductor thermocouple; 4235, heat sink; 4236, metal conductor; 4237, joint; 5, output element; 51, exit lens; 6, first collimator; 7, focusing lens; 8, color filter wheel; 81, first filter area; 82, second filter area; 83, transmission area; 9, first light homogenizer; 10, second light homogenizer; 11, first reflector; 12, second reflector; 13, optical path adjustment lens group; 131, first lens; 132, The second lens; 133, the third lens; 14, the second collimating lens; 16, the first diffuser; 17, the second diffuser; 18, the beam reducing lens group; 19, the light combining lens group; 200, the light valve modulation component; 300, the projection lens. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention 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 described herein; on the contrary, these embodiments are provided to make the present invention 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 the present invention are all explained with reference to the accompanying drawings as examples, but changes can be made as needed, and the changes made are all included in the scope of protection of the present invention. The drawings of the present invention are only used to illustrate the relative position relationship and do not represent the true proportion.

[0048] With the development of optoelectronic technology, lasers are widely used in projection equipment as light sources to provide the laser light used to form the projected image. Currently, the requirements for the display quality of projection equipment are becoming increasingly stringent. However, when lasers are used as light sources in related technologies, the projected images produced exhibit a speckle effect, resulting in the projected image appearing as granular, alternating light and dark spots, resulting in poor display quality.

[0049] The following embodiments of the present application provide a light source device and a projection system. The light provided by the light source device has weak coherence, which can reduce the speckle effect of the projection image formed based on the light provided by the light source device and improve the display effect of the projection image.

[0050] As shown in FIG. 1 or FIG. 17 , the light source device 100 provided in an embodiment of the present application includes: a first laser light source group 1 , a second laser light source group 2 , a dichroic mirror 3 , a fluorescence conversion device 4 and an output element 5 .

[0051] The first laser light source group 1 includes a first laser light source, which is used to emit laser light of a first wavelength band. The second laser light source group 2 includes at least a second laser light source and a third laser light source, which is used to emit laser light of a second wavelength band and the third laser light source is used to emit laser light of a third wavelength band.

[0052] The dichroic mirror 3 is located on the light-emitting side of the first laser light source group 1 and the second laser light source group 2, and the fluorescence conversion device 4 and the output element 5 are respectively located on the light-emitting side of the dichroic mirror 3. For example, the fluorescence conversion device 4 and the output element 5 are respectively located at different positions on the light-emitting side of the dichroic mirror 3.

[0053] The dichroic mirror 3 is used to emit laser light of the first band, laser light of the second band and laser light of the third band. The fluorescence conversion device 4 can provide target fluorescence under the excitation of the laser light of the first band. The target fluorescence is reflected by the dichroic mirror 3 to the output element 5. The target fluorescence includes fluorescence of the second band and fluorescence of the third band.

[0054] The light source device 100 includes at least three light beams, which are emitted by the output element 5 according to a timing sequence. The at least three light beams include: laser light of the first band emitted alone, laser light of the second band and fluorescence light of the second band emitted together, and laser light of the third band and fluorescence light of the third band emitted together.

[0055] The first laser light source group 1 is configured to emit laser light of a first wavelength band, which can be directed toward the dichroic mirror 3. The second laser light source group 2 is configured to emit laser light of multiple colors. The multiple colors of laser light emitted by the second laser light source group 2 include at least laser light of a second wavelength band and laser light of a third wavelength band. Furthermore, the multiple colors of laser light emitted by the second laser light source group 2 may also include more laser light of wavelength bands other than the first to third wavelength bands.

[0056] For example, the laser of the first wavelength band may be a blue laser, because the blue laser has higher energy and has stronger fluorescence excitation efficiency. The laser of the second wavelength band may be a red laser, and the laser of the third wavelength band may be a green laser.

[0057] It is not excluded that the multiple colors of laser light emitted by the second laser light source group 2 may also include blue laser light, and the central wavelength of the blue laser light emitted by the second laser light source group 2 is different from the central wavelength of the blue laser light emitted by the first laser light source group 1 .

[0058] If the laser light emitted by the second laser light source group 2 includes blue laser light, the center wavelength of the blue laser light may be different from the center wavelength of the blue laser light emitted by the first laser light source group 1. It should be noted that the laser light emitted by the same laser may not all be of the expected wavelength, but may have a wavelength that has a certain error relative to a certain expected wavelength. The laser light emitted by the laser may include multiple wavelengths within a smaller wavelength range, and the center wavelength of the laser light may refer to the median wavelength within the wavelength range.

[0059] For example, the central wavelength of the blue laser light emitted by the second laser light source group 2 is 465 nanometers. This central wavelength of laser light closely matches the specified high-definition image standard, and the display image formed using this laser light has a higher clarity. The central wavelength of the blue laser light emitted by the first laser light source group 1 can be 455 nanometers. This central wavelength of blue laser light can have a higher excitation efficiency for fluorescence. For example, the central wavelength of the blue laser light emitted by the second laser light source group 2 can also be 455 nanometers, and the central wavelength of the blue laser light emitted by the first laser light source group 1 can be 465 nanometers, which is not limited in the present embodiment.

[0060] In the embodiment of the present application, the dichroic mirror 3 can transmit the laser light of the first wavelength band emitted by the first laser light source group 1 and the laser light of the second wavelength band and the laser light of the third wavelength band emitted by the second laser light source group 2 based on its dichroism, and reflect the fluorescence emitted by the fluorescence conversion device 4.

[0061] In some cases, the dichroic mirror 3 can also transmit or reflect the laser light of the first wavelength band from the fluorescence conversion device 4, and further, can also reflect the laser light of the second wavelength band and the laser light of the third wavelength band from the fluorescence conversion device 4. This function of the dichroic mirror 3 can be used to adaptively design the transmission and reflection performance of light of different wavelength bands at different positions of the dichroic mirror 3.

[0062] In the embodiment of the present application, the excitation of fluorescence by laser light of the first wavelength band (eg, blue laser light) is achieved based on the fluorescence conversion device 4 .

[0063] In one example, the target fluorescence generated by the fluorescence conversion device 4 includes fluorescence in the second wavelength band and fluorescence in the third wavelength band, and the fluorescence in the second wavelength band or the fluorescence in the third wavelength band is combined with the corresponding laser light and emitted by the output element 5. Based on this example, referring to FIG1 , the output element 5 is an exit lens 51.

[0064] In another example, the target fluorescence generated by the fluorescence conversion device 4 includes fluorescence in a fourth wavelength band, for example, yellow fluorescence. After processing, for example, filtering, the fluorescence in the fourth wavelength band produces fluorescence in the second wavelength band and fluorescence in the third wavelength band. In this example, referring to FIG8 , the output element 5 is a combination of an exit lens 51 and a color filter wheel 8. The target fluorescence from the exit lens 51 is filtered by the color filter wheel 8 into fluorescence in the second wavelength band or the third wavelength band, which is then combined with the corresponding laser light and emitted by the color filter wheel 8.

[0065] The light source device 100 provided in the embodiment of the present application is provided with a laser of the first wavelength band by a first laser light source group 1. The laser of the first wavelength band can be a laser with a relatively high energy, so that the laser of the first wavelength band excites the fluorescence conversion device 4 to provide target fluorescence, and has a relatively high fluorescence excitation efficiency. The target fluorescence can be fluorescence of the second wavelength band or fluorescence of the third wavelength band, or can be processed to form fluorescence of the second wavelength band or fluorescence of the third wavelength band. The light source device 100 includes at least three light beams, which include: the laser of the first wavelength band is emitted alone, the laser of the second wavelength band and the fluorescence of the second wavelength band are emitted together, and the laser of the third wavelength band and the fluorescence of the third wavelength band are emitted together. On the one hand, this is conducive to making the projected image have the advantages of higher brightness and higher color saturation. On the other hand, since fluorescence is incoherent, mixing the same color fluorescence into the laser to form a projection image together can reduce the overall coherence of the light of the formed projection image, thereby reducing the speckle effect of the projection image. All of the above can effectively improve the display effect of the projection image.

[0066] The light source device 100 provided in the embodiment of the present application can be designed to include multiple types of light emitting paths. Two exemplary light emitting paths are described below with reference to FIG. 1 and FIG. 17 .

[0067] As shown in FIG1 , the light source device 100 includes a first light emitting path, which includes:

[0068] For the laser beam emitted independently in the first wavelength band, the laser beam in the first wavelength band is emitted through the dichroic mirror 3, the fluorescence conversion device 4, the dichroic mirror 3, and the output element 5. For example, the output element 5 is the exit lens 51, and the laser beam in the first wavelength band is blue laser beam. In other words, the light output path of the blue laser beam emitted by the first laser light source group 1 is: first laser light source group 1 - dichroic mirror 3 - fluorescence conversion device 4 - dichroic mirror 3 - exit lens 51.

[0069] For the light beam emitted by combining the laser light of the second wavelength band and the fluorescence light of the second wavelength band, the laser light of the second wavelength band passes through the dichroic mirror 3 and the output element 5 and is combined with the fluorescence light of the second wavelength band at the output element 5 and emitted.

[0070] For example, the output element 5 is an exit lens 51, the laser light in the second wavelength band is red laser light, and the fluorescence in the second wavelength band is red fluorescence. That is, the blue laser light emitted by the first laser light source group 1 is transmitted through the dichroic mirror 3 to the fluorescence conversion device 4, where it excites red fluorescence. The red fluorescence is then reflected by the dichroic mirror 3 and reaches the exit lens 51. The red laser light emitted by the second laser light source group 2 is transmitted through the dichroic mirror 3 to the exit lens 51. The red fluorescence and the red laser light converge at the exit lens 51 and are then emitted.

[0071] For the light beam emitted by combining the laser light of the third wavelength band and the fluorescence light of the third wavelength band, the laser light of the third wavelength band passes through the dichroic mirror 3 and the output element 5 and is combined with the fluorescence light of the third wavelength band at the output element 5 and emitted.

[0072] For example, the output element 5 is an exit lens 51, the laser light in the third wavelength band is green laser light, and the fluorescence in the third wavelength band is green fluorescence. That is, the blue laser light emitted by the first laser light source group 1 is transmitted through the dichroic mirror 3 to the fluorescence conversion device 4, where it excites green fluorescence. The green fluorescence is then reflected by the dichroic mirror 3 and reaches the exit lens 51. The green laser light emitted by the second laser light source group 2 is transmitted through the dichroic mirror 3 to the exit lens 51. The green fluorescence and the green laser light converge at the exit lens 51 and are then emitted.

[0073] As shown in FIG17 , the light source device 100 includes a second light emitting path, which includes:

[0074] For the laser beam emitted independently in the first wavelength band, the laser beam in the first wavelength band is emitted through the dichroic mirror 3, the fluorescence conversion device 4, the dichroic mirror 3, and the output element 5. For example, the output element 5 is the exit lens 51, and the laser beam in the first wavelength band is blue laser beam. In other words, the light output path of the blue laser beam emitted by the first laser light source group 1 is: first laser light source group 1 - dichroic mirror 3 - fluorescence conversion device 4 - dichroic mirror 3 - exit lens 51.

[0075] For the light beam emitted by combining the laser of the second band and the fluorescence of the second band, the laser of the second band passes through the dichroic mirror 3, the fluorescence conversion device 4, the dichroic mirror 3, and the output element 5, and is combined with the fluorescence of the second band at the output element 5 and emitted.

[0076] For example, the output element 5 is an exit lens 51, the laser light in the second wavelength band is red laser light, and the fluorescence in the second wavelength band is red fluorescence. That is, the blue laser light emitted by the first laser light source group 1 is transmitted through the dichroic mirror 3 to the fluorescence conversion device 4, where it excites red fluorescence. The red fluorescence is then reflected by the dichroic mirror 3 to the exit lens 51. The red laser light emitted by the second laser light source group 2 is transmitted through the dichroic mirror 3 and reflected again by the fluorescence conversion device 4 to the dichroic mirror 3. The dichroic mirror 3 then reflects the red laser light to the exit lens 51. The red fluorescence and the red laser light then converge at the exit lens 51 and are then emitted.

[0077] For the light beam emitted by combining the laser of the third band and the fluorescence of the third band, the laser of the third band passes through the dichroic mirror 3, the fluorescence conversion device 4, the dichroic mirror 3, and the output element 5, and is combined with the fluorescence of the third band at the output element 5 to be emitted.

[0078] For example, the output element 5 is an exit lens 51, the laser light in the third wavelength band is green laser light, and the fluorescence in the third wavelength band is green fluorescence. That is, the blue laser light emitted by the first laser light source group 1 is transmitted through the dichroic mirror 3 to the fluorescence conversion device 4, where it excites green fluorescence. The green fluorescence is then reflected by the dichroic mirror 3 to the exit lens 51. The green laser light emitted by the second laser light source group 2 is transmitted through the dichroic mirror 3 to the fluorescence conversion device 4 and then reflected back to the dichroic mirror 3. The dichroic mirror 3 then reflects the green laser light to the exit lens 51. The green fluorescence and the green laser light then converge at the exit lens 51 and are then emitted.

[0079] Based on the light emission path of the light source device 100 involved in the above-mentioned embodiment of the present application, the embodiment of the present application describes the structure and arrangement of some applicable fluorescence conversion devices 4.

[0080] In some implementations, the fluorescence conversion device 4 is a fluorescence wheel, which includes a fluorescence conversion region 411 and a laser emission region 412. The fluorescence conversion region 411 is configured to emit target fluorescence under the stimulation of the received laser light of the first wavelength band; the laser emission region 412 is configured to receive the laser light of the first wavelength band and emit the laser light in a transmission or reflection manner.

[0081] For example, the laser light of the first wavelength band is blue laser light. Referring to FIG1 , when the fluorescence conversion device 4 is used only to receive the laser light of the first wavelength band and does not need to receive laser light of other wavelength bands, the fluorescence conversion device 4 in the form of a fluorescence wheel can be selected. This simplifies the structural layout of the light source device 100, making the light source device 100 easy to operate and highly efficient.

[0082] In other implementations, referring to Figures 27 and 28, the fluorescence conversion device 4 includes a fluorescence wheel and a light selection layer 413, and the fluorescence wheel includes a fluorescence conversion area 411 and a laser emission area 412; the fluorescence conversion area 411 is used to emit target fluorescence under the excitation of the received laser of the first band; the laser emission area 412 is used to receive the laser of the first band and emit it in a transmission or reflection manner; the light selection layer 413 is located on the surface of the fluorescence wheel facing the dichroic mirror 3, and the light selection layer 413 meets the following conditions: it transmits the laser of the first band and the target fluorescence, and reflects the laser of the second band and the laser of the third band.

[0083] Since the actual wavelength band occupied by laser is narrow, while the wavelength band occupied by fluorescence is wide, for laser and fluorescence of the same color, taking red laser and red fluorescence as an example, the red laser only occupies the narrower first part of the second wavelength band, and the red fluorescence occupies the wider second part of the second wavelength band, wherein the second part may cover the first part. In this way, according to the actual wavelength bands of laser and fluorescence of the same color, the transmission and reflection characteristics of the optical selection layer 413 are designed, so that the optical selection layer 413 can meet the following conditions: transmitting the laser of the first wavelength band, the fluorescence of the second wavelength band, the fluorescence of the third wavelength band and the fluorescence of the fourth wavelength band mentioned above, and reflecting the laser of the second wavelength band and the laser of the third wavelength band.

[0084] For example, when the first wavelength band is blue, the second wavelength band is red, and the third wavelength band is green, when red laser light and blue laser light are both emitted toward the fluorescence conversion device 4, the red laser light is reflected by the light selection layer 413. The red laser light does not enter the fluorescence wheel, but is instead reflected by the fluorescence conversion device 4 toward the dichroic mirror 3. Simultaneously, the blue laser light is transmitted by the light selection layer 413 to the fluorescence conversion region 411 of the fluorescence wheel, generating red fluorescence. The red fluorescence is then transmitted by the light selection layer 413 to the dichroic mirror 3. The dichroic mirror 3 then reflects both the red laser light and the red fluorescence light toward the exit lens 51, achieving combined emission of the red laser light and the red fluorescence light.

[0085] It can be seen that when the fluorescence conversion device 4 is used to receive blue laser and lasers of other colors at the same time, a fluorescence conversion device 4 including a fluorescence wheel and a light selection layer 413 can be selected. The light selection layer 413 is used to transmit blue laser and fluorescence and reflect other lasers different from the blue laser, thereby realizing the selection of the transmitted light.

[0086] The above two implementations of the fluorescence conversion device 4 both involve a fluorescence wheel, and the structures of the fluorescence wheels involved in the two can be the same. The structure and function of the fluorescence wheel are described below in conjunction with the laser in the first wavelength band being blue laser.

[0087] The fluorescent wheel has a fluorescent conversion area 411 and a laser emission area 412. The fluorescent conversion area 411 has a fluorescent material that can emit the same color of fluorescence as the fluorescent material under the irradiation of excitation light. The color of the fluorescent material is not in the first band, for example, not blue.

[0088] For example, the fluorescent material may include a yellow fluorescent material, which can be excited by a blue laser to emit yellow fluorescence; or, the fluorescent material may include both a red fluorescent material and a green fluorescent material, which can be excited by a blue laser to emit red fluorescence and green fluorescence; or the fluorescent material may also include fluorescent materials of other colors.

[0089] The laser emitting area 412 may be a transmission area for transmitting the received laser light; or the laser emitting area 412 may be a reflection area for reflecting the received laser light.

[0090] When the laser emitting area 412 of the fluorescence conversion device 4 is configured to receive only blue laser light and not laser light of other colors, the laser emitting area 412 is configured to allow only blue laser light to be transmitted or reflected. When the laser emitting area 412 of the fluorescence conversion device 4 is configured to receive both blue laser light and laser light of other colors, the laser emitting area 412 is configured to allow both blue laser light and laser light of other colors to be transmitted or reflected simultaneously. Of course, in this case, the laser emitting area 412 can be configured to include a blue laser emitting area, a red laser emitting area, a green laser emitting area, and so on.

[0091] The fluorescence conversion device 4 is configured to rotate, for example, the fluorescence conversion device 4 can rotate around a rotation axis Z, which can pass through its central axis. During the rotation, the fluorescence conversion area 411 and the laser emission area 412 of the fluorescence conversion device 4 receive the blue laser in a time sequence.

[0092] Figure 2 is a schematic diagram of the structure of a fluorescent wheel provided in an embodiment of the present application, and Figure 2 shows a left view of the fluorescent wheel in Figure 1. Combining Figures 1 and 2, the structure is further explained by taking the fluorescent conversion device 4 receiving only blue laser as an example.

[0093] The fluorescence conversion device 4 can rotate around the rotation axis Z in the w direction or the opposite direction of the w direction so that the blue laser received by the fluorescence conversion device 4 switches between the fluorescence conversion area 411 and the laser emission area 412. For example, the fluorescence conversion device 4 can be rotated by a motor. For example, the fluorescence conversion device 4 can be circular or annular, and the fluorescence conversion area 411 and the laser emission area 412 in the fluorescence conversion device 4 can be fan-shaped or fan-shaped. In the embodiment of the present application, the fluorescence conversion device 4 is annular as an example. The annular surface of the annular ring can intersect with the first direction (x direction), the rotation axis Z can be parallel to the x direction, and the rotation axis Z can pass through the center of the annular ring and be perpendicular to the annular surface of the annular ring. For example, the fluorescence conversion area 411 in the fluorescence conversion device 4 can include a reflective substrate, and a fluorescent material (such as phosphor) is provided on the reflective substrate. The fluorescence emitted by the fluorescent material under the excitation of the blue laser can be reflected by the reflective substrate to be emitted toward the focusing mirror 7.

[0094] In an embodiment of the present application, the fluorescence conversion zone 411 and the laser emission zone 412 in the fluorescence conversion device 4 are two independent continuous regions. The fluorescence conversion zone 411 can be a continuous region. Only one fluorescent material can be set in this region, such as a yellow fluorescent material. Alternatively, the region may include multiple sub-regions, and different fluorescent materials are set in different sub-regions. As shown in Figure 2, the fluorescence conversion zone 411 may include adjacent sub-regions G1 and G2. For example, a red fluorescent material is set in one of the two sub-regions for being excited to emit red fluorescence; and a green fluorescent material is set in the other sub-region for being excited to emit green fluorescence. For example, the areas of sub-region G1, sub-region G2 and laser emission zone 412 can be equal.

[0095] In some examples, the fluorescence conversion zone 411 and the laser emission zone 412 in the fluorescence conversion device 4 may each include multiple sub-regions, and the sub-regions in the fluorescence conversion zone 411 and the sub-regions in the laser emission zone 412 may be spaced apart from each other. For example, the fluorescent materials in different sub-regions of the fluorescence conversion zone 411 may be different, or sub-regions may include the same fluorescent material. For example, the fluorescence conversion device 4 may include six sub-regions arranged in a circumferential direction, three of which belong to the fluorescence conversion zone 411 and the other three belong to the laser emission zone 412. Each sub-region of the fluorescence conversion zone 411 is provided with a yellow fluorescent material. Between every two adjacent sub-regions belonging to the fluorescence conversion zone 411, there is a sub-region belonging to the laser emission zone 412, and between every two adjacent sub-regions belonging to the laser emission zone 412, there is a sub-region belonging to the fluorescence conversion zone 411. For another example, the fluorescence conversion device 4 includes six sub-regions arranged in sequence along the circumferential direction, of which four sub-regions belong to the fluorescence conversion region 411 and two sub-regions belong to the laser emission region 412. Two of the four sub-regions are provided with red fluorescent material, and the other two sub-regions are provided with green fluorescent material. The same fluorescent material can be provided in two opposing sub-regions.

[0096] In the present embodiment, there are no limitations on the sub-region division method of the fluorescence conversion device 4, the area of ​​each sub-region, or the fluorescent material provided in the sub-region belonging to the fluorescence conversion region 411. The fluorescent material provided in the sub-region belonging to the fluorescence conversion region 411 can be designed based on the color components required to form the projection image. The area of ​​each sub-region of the fluorescence conversion region 411 and the laser emission region 412 can be designed based on the proportion of the light emitted by each sub-region in the desired light output.

[0097] The structure and function of the fluorescence conversion device 4 containing the fluorescence wheel are described above. The structure and function of another improved form of the fluorescence conversion device 4 are described below.

[0098] As shown in FIG17 , the fluorescence conversion device 4 includes a dynamic optical component 421, a fluorescence conversion component 422, and a heat dissipation component 423. The dynamic optical component 421 includes a dynamically switchable reflective portion 4211 and a transmissive portion 4212. The reflective portion 4211 is configured to reflect laser light of a first wavelength band, and the transmissive portion 4212 is configured to transmit light, which includes at least laser light of the first wavelength band, laser light of the second wavelength band, and laser light of the third wavelength band. The fluorescence conversion component 422 is located on the light-emitting side of the dynamic optical component 421 and is configured to emit target fluorescence under the stimulation of the received laser light of the first wavelength band. The heat dissipation component 423 is located on the side of the fluorescence conversion component 422 facing away from the dynamic optical component 421 and is configured to dissipate heat from the fluorescence conversion component 422.

[0099] The fluorescence conversion device 4 can be a fixed fluorescence conversion component that is fixedly assembled in the light source device 100. This can significantly improve the reliability of the light source device 100. Since it has no mechanical movement, the structural design size of the light source device 100 can be reduced. Furthermore, the area of ​​the fluorescent material arranged on the fluorescence conversion device 4 can be reduced, for example, from the annular area in the related art to a small square or circular area, which significantly reduces the amount of fluorescent material used and reduces the cost of the fluorescent material. Furthermore, the fluorescence conversion device 4 is not subject to dynamic limitations of high-speed rotation, allowing for centralized heat dissipation. This embodiment of the fluorescence conversion device 4 can achieve stable optical performance and efficient output at a certain laser power, thereby improving the color rendering capabilities of the projection system.

[0100] As shown in FIG18 , the dynamic optical component 421 includes a reflective portion 4211 and a transmissive portion 4212. The dynamic optical component 421 can achieve dynamic switching between the reflective portion 4211 and the transmissive portion 4212 by means of rotation, linear reciprocating motion, or electrical conversion of light transmission. This embodiment of the present application uses rotation as an example to drive the dynamic optical component 421. In actual applications, different motion methods can be used according to structural requirements, and this is not limited here.

[0101] The dynamic optical component 421 further includes a driving element, which can drive the dynamic optical component 421 to move, so that the laser light can be incident on the reflective portion 4211 and the transmissive portion 4212 in a time-division manner.

[0102] For example, when laser light of the first wavelength band is incident on the reflective portion 4211, it is reflected by the dichroic mirror 3 and then reflected in a predetermined direction by the dichroic mirror 3. When laser light of the first wavelength band is incident on the transmissive portion 4212, it can enter the fluorescence conversion component 422 via the transmissive portion 4212, thereby stimulating the fluorescence conversion component 422 to emit fluorescence. The stimulated fluorescence is then reflected by the dichroic mirror 3 and then reflected in a predetermined direction by the dichroic mirror 3. This allows light of different colors to be sequentially output in the predetermined direction, achieving the emission of three primary colors.

[0103] The fluorescence conversion component 422 is located on a side of the dynamic optical component 421 away from the dichroic mirror 3 . The fluorescence conversion component 422 is configured to emit red fluorescence, green fluorescence or fluorescence of other colors under the excitation of the blue laser.

[0104] Figure 19 is a schematic diagram of a cross-sectional structure of a fluorescence conversion component 422 provided in an embodiment of the present application. As shown in Figure 19, the fluorescence conversion component 422 includes a fluorescence conversion layer 4221, an anti-reflection layer 4222, and a reflective layer 4223. The fluorescence conversion layer 4221 is configured to emit fluorescence when excited by laser light in the first wavelength band. The anti-reflection layer 4222 is located on the side of the fluorescence conversion layer 4221 facing the dynamic optical component 421. The anti-reflection layer 4222 satisfies the following conditions: it transmits the laser light in the first wavelength band and the fluorescence generated by the excitation, and it reflects the laser light in the second wavelength band and the laser light in the third wavelength band. In some examples, the anti-reflection layer 4222 also enhances the transmittance of the laser light in the first wavelength band. The reflective layer 4223 is located on the side of the fluorescence conversion layer 4221 facing away from the anti-reflection layer 4222 and is configured to reflect the fluorescence generated by the excitation.

[0105] The fluorescence generated by the excitation mentioned herein may be fluorescence in the second wavelength band, fluorescence in the third wavelength band, or fluorescence in the fourth wavelength band (e.g., yellow fluorescence). The fluorescence in the fourth wavelength band can be filtered to obtain fluorescence in the second wavelength band and fluorescence in the third wavelength band. The design of the anti-reflection layer 4222 may refer to the aforementioned light selection layer 413.

[0106] Fluorescence conversion layer 4221 serves as the core film layer of the fluorescence conversion component, emitting fluorescence under the stimulation of blue laser light. The fluorescence conversion layer can be made of a fluorescent ceramic sintered at high temperature with a YAG-based phosphor and a ceramic material, a ceramic fluorescent material produced through a crystal growth process, or a single-crystal fluorescent material, without limitation. Fluorescence conversion layer 4221 has a thickness between 0.05 mm and 1 mm.

[0107] For example, if the laser in the first wavelength band is blue, the laser in the second wavelength band is red, and the laser in the third wavelength band is green, the anti-reflection layer 4222 is used to transmit blue laser light and fluorescence and reflect red laser light, green laser light, and other laser light of various colors. Furthermore, the anti-reflection layer 4222 enhances the transmission of blue laser light. Specifically, a coating process is used to enable the anti-reflection layer 4222 to have a reflection-reducing effect in the wavelength band spectral range of 420nm to 470nm, thereby increasing the transmission of blue laser light. The thickness of the anti-reflection layer 4222 is between 0.5μm and 10μm, which is not limited here.

[0108] Reflective layer 4223 is located on the side of fluorescence conversion layer 4221 facing away from anti-reflection layer 4222. Reflective layer 4223 is used to reflect red, green, or other fluorescent light. Specifically, reflective layer 4223 can be a dielectric film or a metal film. Reflective layer 4223 has a thickness between 0.5 μm and 10 μm and has a high reflectivity for visible light in the 420 nm to 680 nm wavelength range. To ensure reflection efficiency, reflective layer 4223 can be made of a dielectric film.

[0109] By arranging an anti-reflection layer 4222 and a reflective layer 4223 on both sides of the fluorescence conversion layer 4221, the transmission of the blue laser can be increased to excite the fluorescence conversion layer 4221, and the fluorescence within a specific wavelength band stimulated by the fluorescence conversion layer 4221 can be reflected toward the direction of the dichroic mirror 3, so that more fluorescence can be utilized.

[0110] The fluorescent conversion component 422 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 device. 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 be centrally cooled, further enhancing its operational reliability.

[0111] As shown in FIG17 , the light source device further includes a heat sink 423 , which is located on the side of the fluorescence conversion component 422 facing away from the dynamic optical component 421 . Heat sink 423 is used to dissipate heat from the fluorescence conversion component. In practice, heat sink 423 can be a metal heat sink, an air-cooled device, a liquid-cooled device, or a semiconductor refrigeration device to efficiently dissipate heat from the fluorescence conversion component 422 .

[0112] Figure 20 is a second schematic cross-sectional view of the fluorescence conversion component 422 provided in an embodiment of the present application. As shown in Figure 20 , the fluorescence conversion component 422 further includes a thermally conductive layer 4224 and a connecting layer 4225. The thermally conductive layer 4224 is located on the side of the reflective layer 4223 facing away from the fluorescence conversion layer 4221. The connecting layer 4225 is located on the side of the thermally conductive layer 4224 facing away from the reflective layer 4223. The connecting layer 4225 is used to connect to the heat dissipation component 423.

[0113] Thermal conductive layer 4224 is located on the side of reflective layer 4223 facing away from phosphor conversion layer 4221. The purpose of providing thermal conductive layer 4224 on the surface of reflective layer 4223 is to rapidly transfer heat generated by the laser excitation point to the entire phosphor conversion layer, thereby increasing heat dissipation. Thermal conductive layer 4224 can be made of a highly thermally conductive metal layer, such as copper or gold, with a thickness ranging from 0.1μm to 1000μm. For cost reasons, a copper layer with a thickness between 10μm and 200μm is also an option, but this is not a limitation.

[0114] The connection layer 4225 is located on the side of the heat conducting layer 4224 away from the reflective layer 4223 and is used to connect to the heat dissipation component 423. When the fluorescence conversion component 422 is connected to the heat dissipation component 423 in different connection methods, the connection layer 4225 can be made of different materials.

[0115] In some embodiments, the connection layer 4225 can be connected to the heat dissipation component 423 by mechanical fixation using thermal grease. In some embodiments, the connection layer 4225 can be connected to the heat dissipation component 423 by colloid bonding or mechanical fixation, by bonding to a carrier substrate, by sintering and encapsulating a ceramic fluorescent material through high-temperature sintering, or by welding.

[0116] In the embodiment of the present application, the structures of the connection layer 4225 and the heat dissipation component 423 are illustrated by taking welding as an example.

[0117] As shown in FIG20 , the connection layer 4225 includes a solder resist layer 42251 and a first soldering layer 42252. The solder resist layer 42251 is located on the side of the heat conducting layer 4224 facing away from the reflective layer 4223. The first soldering layer 42252 is located on the side of the solder resist layer 42251 facing away from the heat conducting layer 4224. The first soldering layer 42252 is used for soldering the heat dissipation component 423.

[0118] In the embodiment of the present application, the thermal conductive layer 4224 can be a copper layer, upon which a solder resist layer 42251 is plated. The solder resist layer 42251 can be a nickel layer or a titanium layer, with nickel being a more thermally conductive layer and having a thickness between 0.1 μm and 5 μm. A first solder layer 42252 is disposed beneath the fluorescence conversion component 422. The first solder layer 42252 is a solderable metal layer, such as gold, with a thickness between 0.1 μm and 2 μm.

[0119] Figure 21 is a schematic diagram of the structure of a heat sink 423 provided in an embodiment of the present application. As shown in Figure 21 , heat sink 423 can utilize a semiconductor refrigeration device. The semiconductor refrigeration device includes: a second welding layer 4231, a first heat conducting plate 4232, a second heat conducting plate 4233, multiple semiconductor thermocouples 4234, and a heat sink 4235. The second welding layer 4231 is located on a side close to the first welding layer 42252, and the second welding layer 4231 is used for welding with the first welding layer 42252; the first thermal conductive sheet 4232 is located on a side of the second welding layer 4231 away from the first welding layer 42252; the second thermal conductive sheet 4233 is located on a side of the first thermal conductive sheet 4232 away from the second welding layer 4231; a plurality of semiconductor thermocouples 4234 are located between the first thermal conductive sheet 4232 and the second thermal conductive sheet 4233, and the plurality of semiconductor thermocouples 4234 are connected in series with each other; the heat sink 4235 is located on a side of the second thermal conductive sheet 4233 away from the first thermal conductive sheet 4232.

[0120] The second welding layer 4231 is used for welding with the first welding layer 42252. The second welding layer 4231 can be a nickel-gold layer or a titanium-platinum-gold layer, and is connected to the fluorescence conversion component 422 by welding.

[0121] Semiconductor thermocouple 4234 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 4236 connects the P-type and N-type semiconductors to form a complete series circuit. Metal conductor 4236 can be made of copper, aluminum, or other metal conductors. In this embodiment, copper is used.

[0122] A first thermal conductive sheet 4232 and a second thermal conductive sheet 4233 are provided on either side of the semiconductor thermocouple 4234. These sheets can be made of insulating and thermally conductive ceramic sheets. When connected to a power source, 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 a heat sink 4235 to the heat dissipation end effectively dissipates heat from the fluorescence conversion component 422.

[0123] In the embodiment of the present application, the thermal pad and the semiconductor thermocouple can be mechanically fixed together by applying thermal grease, or they can be assembled together by gold-nickel plating on specific areas of the thermal pad and the semiconductor thermocouple, without limitation. The joint 4237 between the thermal pad and the metal conductor 4236 can be made of thermal grease, weldable metal, or other materials, without limitation.

[0124] The radiator 4235 may be a metal heat sink, or may be an air cooling, liquid cooling or other heat dissipation device, which is not limited here.

[0125] The embodiment of the present application only uses the semiconductor refrigeration device as an example for the heat dissipation component 423. In specific implementation, the heat dissipation component 423 can also adopt 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.

[0126] When the fluorescence conversion device 4 is configured to receive only blue laser light and not laser light of other colors, the transmissive portion 4212 of the dynamic optical component 421 is configured to allow only blue laser light to pass through. When the fluorescence conversion device 4 is configured to receive both blue laser light and laser light of other colors, the transmissive portion 4212 of the dynamic optical component 421 is configured to allow both blue laser light and laser light of other colors to pass through or reflect.

[0127] 17 and 18 , the structure of the fluorescence conversion device 4 will be further described by taking the example of the fluorescence conversion device 4 being able to simultaneously receive blue laser light, red laser light, and green laser light.

[0128] As shown in Figure 18, the transmission part 4212 includes a first filter part 42121 and a second filter part 42122; the first filter part 42121 is used to transmit light in the first and second bands and reflect light in the third band; the second filter part 42122 is used to transmit light in the first and third bands and reflect light in the second band; wherein, the first band includes a blue band, the second band includes a red band, and the third band includes a green band.

[0129] The first filter section 42121 is used to transmit light in the first band (blue) and the second band (red), and reflect light in the third band (green); the second filter section 42122 is used to transmit light in the first band (blue) and the third band (green), and reflect light in the second band (red); the reflective section 4211 in the dynamic optical component 421 is used to reflect light in the first band (blue).

[0130] The thickness of the first filter portion 42121 ranges from 0.1 mm to 5 mm. Through coating, the first filter portion exhibits the properties shown in Figure 22: it transmits light ranging from 420 nm to 470 nm, reflects light ranging from 470 nm to 580 nm, transmits light ranging from 590 nm to 630 nm, and reflects light above 640 nm. This allows the first filter portion to transmit blue light while filtering out red light. Furthermore, the multi-layer coating allows narrow-angle blue light to pass through, while reflecting wide-angle blue light.

[0131] The second filter portion 42122 has a thickness ranging from 0.1 mm to 5 mm. Through coating, the second filter portion has the properties shown in Figure 23: it transmits light from 420 nm to 470 nm, reflects light from 470 nm to 490 nm, transmits light from 500 nm to 590 nm, and reflects light above 600 nm. This allows it to transmit blue light while filtering out green light. Similarly, multi-layer coating allows narrow-angle blue light to pass through, while reflecting wide-angle blue light. The reflective portion 4211 has a thickness ranging from 0.1 mm to 5 mm. Through coating, it can reflect light from 420 nm to 470 nm, thereby reflecting blue light.

[0132] Because blue laser light is excitation light and its energy is much higher than that of stimulated fluorescent light, the areas of the first filter portion 42121 and the second filter portion 42122 are both larger than those of the reflective portion 4211. However, the light source device 100 generally requires higher-energy green light, so the area of ​​the second filter portion 42122 for filtering out green light can be larger than that of the first filter portion 42121 for filtering out red light.

[0133] As shown in FIG17 , when the dynamic optical component 421 is switched so that the reflective portion 4211 faces the fluorescence conversion component 422, the first laser light source group 1 is activated. The blue laser light emitted by the first laser light source group 1 is reflected by the first reflector 11, then incident on the dichroic mirror 3 (specifically, the second portion 322 of the dichroic mirror 3). After being focused by the focusing mirror 7, it is irradiated onto the reflective portion 4211 of the dynamic optical component 421. The blue laser light incident on the reflective portion 4211 is reflected by the dichroic mirror 3 (specifically, the third portion 323 of the dichroic mirror 3), where it is reflected and emitted in the set direction.

[0134] When the dynamic optical component 421 switches to a position where the first filter section 42121 faces the fluorescence conversion component 422, the second laser sources in the first laser source group 1 and the second laser source group 2 are simultaneously activated. The blue laser light emitted by the first laser source group 1 is reflected by the first reflector 11, then enters the second section 322 of the dichroic mirror. After being focused by the focusing lens 7, it is irradiated onto the first filter section 42121 of the dynamic optical component 421. The red laser light emitted by the second laser source group 2 is reflected by the second reflector 12, then enters the fourth section 324 of the dichroic mirror. After being focused by the focusing lens 7, it is irradiated onto the first filter section 42121 of the dynamic optical component 421.

[0135] Blue laser light passes through the first filter 42121 and strikes the fluorescence conversion component 422, exciting it to emit fluorescence (e.g., yellow fluorescence). This fluorescence is reflected by the reflective layer 4223, filtered by the first filter 42121, and then emitted toward the dichroic mirror 3. This red fluorescence is then reflected by the dichroic mirror 3 and emitted in the desired direction. The anti-reflection layer 4222 has an anti-transmittance effect on blue light and a reflective effect on red and green light. The red laser light is reflected by the anti-reflection layer 4222, passes through the first filter 42121, and then exits the dichroic mirror 3. This reflection is then reflected by the dichroic mirror 3 and emitted in the desired direction along with the red fluorescence.

[0136] When the dynamic optical component 421 switches to the position where the second filter section 42122 faces the fluorescence conversion component 422, the third laser source in the first laser source group 1 and the second laser source group 2 are simultaneously activated. The blue laser light emitted by the first laser source group 1 is reflected by the first reflector 11, then enters the second section 322 of the dichroic mirror. After being focused by the focusing lens 7, it is irradiated onto the second filter section 42122 of the dynamic optical component 421. The green laser light emitted by the second laser source group 2 is reflected by the second reflector 12, then enters the fourth section 324 of the dichroic mirror. After being focused by the focusing lens 7, it is irradiated onto the second filter section 42122 of the dynamic optical component 421.

[0137] The blue laser light passes through the second filter 42122 and strikes the fluorescence conversion component 422, exciting the fluorescence conversion component 422 to emit fluorescence (e.g., yellow fluorescence). The fluorescence is reflected by the reflective layer 4223, filtered by the second filter 42122, and then emitted toward the dichroic mirror 3. After being reflected by the dichroic mirror 3, it is emitted in a predetermined direction. The green laser light is reflected by the anti-reflection layer 4222, passes through the second filter 42122, and then emitted toward the dichroic mirror 3. After being reflected by the anti-reflection layer 4222, it is emitted together with the red fluorescence in a predetermined direction.

[0138] Thus, the three primary colors of light are emitted sequentially for image display. In the light source device provided in the embodiment of the present application, the emitted red light is a mixture of red fluorescent light and red laser light, and the emitted green light is a mixture of green fluorescent light and green laser light. Because laser light has a large color gamut, this can improve the color rendering ability of the projection system.

[0139] The following is an exemplary description of the structure and arrangement of the first laser light source group 1 and the second laser light source group 2 involved in the light source device 100 provided in the embodiment of the present application.

[0140] In some implementations, as shown in FIG1 , the first laser light source group 1 and the second laser light source group 2 are independently arranged. This approach is highly versatile and is applicable to both the first laser light source group 1 and the second laser light source group 2 commonly used in the art.

[0141] When the first laser light source group 1 and the second laser light source group 2 are independently arranged, the light emission directions of the first laser light source group 1 and the second laser light source group 2 can be parallel or perpendicular to each other, and can be adaptively designed based on the actual light emission path of the light source device 100. Of course, the light emission directions of the first laser light source group 1 and the second laser light source group 2 can also be designed to simplify the structure of the light source device 100.

[0142] In some examples, as shown in Figures 16 or 17, the light source device 100 also includes at least one of a first reflector 11 and a second reflector 12; the first reflector 11 is used to change the optical path of the laser emitted by the first laser light source group 1; the second reflector 12 is used to change the optical path of the laser emitted by the second laser light source group 2.

[0143] The reflector is used to change the optical path of the laser light emitted by the first laser light source group 1 and / or the second laser light source group 2. For example, the reflector can change the optical path of the emitted light from a first direction to a second direction to flexibly adjust the optical paths of blue laser light and laser light of multiple colors.

[0144] For example, Figure 1 illustrates that the first laser light source group 1 and the second laser light source group 2 are arranged independently, one of the first laser light source group 1 and the second laser light source group 2 is arranged along a first direction, and the other is arranged along a second direction, wherein the first direction is perpendicular to the second direction, that is, the light emitting directions of the first laser light source group 1 and the second laser light source group 2 are perpendicular to each other.

[0145] Figure 16 illustrates that the first laser light source group 1 and the second laser light source group 2 are arranged independently, and the light emission directions of the first laser light source group 1 and the second laser light source group 2 are parallel, and a second reflector 12 is configured for the second laser light source group 2 to change the optical path of the laser emitted therefrom.

[0146] For the independently arranged second laser light source group 2, its structure can be seen in Figures 10 and 11. Figure 10 is a schematic structural diagram of a second laser light source group 2 provided in an embodiment of the present application. As shown in Figure 10, the second laser light source group 2 may include two rows of light-emitting chips 21 mounted on a base plate (not marked in the figure). One row of light-emitting chips is a red light-emitting chip for emitting red laser; the other row of light-emitting chips is a green light-emitting chip for emitting green laser. The second laser light source group 2 may also include four conductive pins 24, and the four conductive pins may include two positive pins and two negative pins. Each row of light-emitting chips can be connected in series, and a positive pin and a negative pin are connected at both ends respectively, so as to receive current transmitted by an external power supply through the positive pin and the negative pin, and then emit laser under the action of the current. The laser shown in Figure 10 can be called a multi-chip laser diode (MCL) type laser.

[0147] For example, the second laser light source group 2 may further include multiple heat sinks 22 and multiple reflective prisms 23. Each light-emitting chip 21 in the second laser light source group 2 may correspond to one heat sink 22 and one reflective prism 23. The heat sink 22 may be fixed to the base plate, and the light-emitting chip 21 may be fixed to the base plate by being fixed to the heat sink 22. The reflective prism 23 is located on the light-emitting side of the corresponding light-emitting chip 21. The light-emitting chip 21 may emit laser light toward the corresponding reflective prism 23, and the reflective prism 23 may emit the incident laser light away from the base plate, thereby achieving light emission of the second laser light source group 2.

[0148] Figure 11 is a schematic diagram of the structure of another second laser light source group 2 provided in an embodiment of the present application, and Figure 12 is a schematic diagram of the structure of yet another second laser light source group 2 provided in an embodiment of the present application. Figure 11 may be a top view of the laser shown in Figure 12. As shown in Figures 11 and 12, the second laser light source group 2 may include two light-emitting modules M mounted on a base plate (not shown in the figures), and each light-emitting module M is provided with a light-emitting chip 21. For example, a row of red light-emitting chips 21 is provided in the light-emitting module M on the left, and a row of green light-emitting chips 21 is provided in the light-emitting module M on the right. The lasers shown in Figures 11 and 12 can be called Qualas packaged lasers.

[0149] It should be noted that the embodiments of this application illustrate only an example in which the second laser light source group 2 includes a row of red light-emitting chips and a row of green light-emitting chips. For example, the second laser light source group 2 may also include light-emitting chips that emit laser light of other colors, such as a row of blue chips, or blue and green light-emitting chips arranged in a row. In actual applications, the number of light-emitting chips, the number of rows, and the arrangement of the chips can be modified based on brightness or other requirements.

[0150] In other implementations, referring to FIG17 , the first laser light source group 1 and the second laser light source group 2 are integrated and cooperate to form a laser light source array. This method only requires one set of optical paths, which helps to simplify the optical paths, making the structural arrangement of the light source device 100 simpler and helping to reduce energy consumption.

[0151] When the first laser light source group 1 and the second laser light source group 2 are integrated and cooperated to form a laser light source array, the laser light source array can adopt a laser array or a laser including multiple laser light sources, such as an MCL laser, which is not limited here.

[0152] In some examples, as shown in FIG17 , the light source device 100 further includes at least one of a first reflector 11 and a second reflector 12 ; the first reflector 11 is used to change the optical path of the laser emitted by the first laser light source group 1 ; and the second reflector 12 is used to change the optical path of the laser emitted by the second laser light source group 2 .

[0153] For example, FIG17 illustrates an integrated arrangement of a first laser light source group 1 and a second laser light source group 2, wherein the light emission directions of the first laser light source group 1 and the second laser light source group 2 are parallel. Furthermore, a first reflector 11 and a second reflector 12 are respectively configured for the first laser light source group 1 and the second laser light source group 2. The first reflector 11 is located on the light emission side of the first laser light source group 1 and is used to reflect the light emitted by the first laser light source group 1, for example, toward the second portion 322 of the dichroic mirror described below. The second reflector 12 is located on the light emission side of the second laser light source group 2 and is used to reflect the light emitted by the second laser light source group 2, for example, toward the fourth portion 324 of the dichroic mirror described below.

[0154] The laser beams emitted by the first laser light source group 1 and the second laser light source group 2 can be regarded as a laser spot when they are incident on the corresponding reflector. Therefore, the size of the first reflector 11 and the second reflector 12 needs to be larger than the size of the incident laser spot. By setting the first reflector 11 and the second reflector 12 to a suitable angle, the laser emitted by the first laser light source group 1 can be reflected by the first reflector 11 and then incident on the second part 322, and the laser emitted by the second laser light source group 2 can be reflected by the second reflector 12 and then incident on the fourth part 324.

[0155] The following describes the dichroic mirror 3 in the light source device 100 provided in an embodiment of the present application with reference to the accompanying drawings, using the dichroic mirror 3 in the light source device 100 shown in FIG. 1 or FIG. The characteristics of the first region 311 in the dichroic mirror 3 in the light source device 100 shown in FIG. 4 can also be referred to the following description of the dichroic mirror 3.

[0156] In an embodiment of the present application, the transmittance of at least a portion of the dichroic mirror 3 for light with a wavelength within the target wavelength range may be greater than a first probability threshold, and the transmittance for light with a wavelength outside the target wavelength range may be less than a second probability threshold. The first probability threshold is greater than the second probability threshold, and the first probability threshold is relatively close to 1, while the second probability threshold is relatively close to 0. For example, the first probability threshold may be 90%, 93%, 94%, or even 96%, and the second probability threshold may be 10%, 8%, 5%, or even less, although this embodiment of the present application is not limited thereto. For example, the dichroic mirror 3 may reflect light outside the target wavelength range, and the reflectance for light outside the target wavelength range may be greater than the first probability threshold. For the dichroic mirror 3 shown in Figures 1 and 3, the at least portion of the region may be the entire region of the dichroic mirror 3; for the dichroic mirror 3 shown in Figure 4, the at least portion of the region may be the first zone 311 of the dichroic mirror 3.

[0157] The wavelengths in the target wavelength range satisfy the following conditions: the absolute value of the wavelength difference from the center wavelength of the laser light of the first wavelength band emitted by the first laser light source group 1 is less than a wavelength difference threshold, or the absolute value of the wavelength difference from the center wavelength of the laser light of the second wavelength band or the laser light of the third wavelength band emitted by the second laser light source group 2 is less than the wavelength difference threshold. If a represents the center wavelength of the laser light and b represents the wavelength difference threshold, then the wavelengths whose absolute value of the wavelength difference from the center wavelength is less than the wavelength difference threshold are wavelengths within the range of a±b.

[0158] For example, the wavelength difference threshold can range from 3 nanometers to 10 nanometers, and further from 3 nanometers to 6 nanometers. The target wavelength range includes the wavelengths of the laser light of the first wavelength band emitted by the first laser light source group 1 and the wavelengths of all laser light emitted by the second laser light source group 2. This ensures that the dichroic mirror 3 transmits the laser light of the second wavelength band or the laser light of the third wavelength band emitted by the first laser light source group 1 and the laser light emitted by the second laser light source group 2.

[0159] Assume that the first laser light source group 1 emits a blue laser with a central wavelength of 465 nanometers, and the second laser light source group 2 is used to emit a red laser and a green laser, the central wavelength of the red laser is 639 nanometers, and the central wavelength of the green laser is 525 nanometers; the wavelength difference threshold is 6 nanometers. Under this assumption, the target wavelength ranges of the laser whose transmittance on the dichroic mirror 3 is greater than the first probability threshold include: 459 nanometers to 471 nanometers, 519 nanometers to 531 nanometers, and 633 nanometers to 645 nanometers. Figure 5 is a relationship diagram of the transmittance of a dichroic mirror for light and the wavelength of the light provided in an embodiment of the present application. In the coordinate system shown in Figure 5, the horizontal axis represents the wavelength of the light, and the vertical axis represents the transmittance of the dichroic mirror 3 for light of each wavelength. As shown in FIG5 , under the above assumptions, the transmittance of the dichroic mirror 3 for lasers with wavelengths within the target wavelength range (i.e., 459 nm to 471 nm, 519 nm to 531 nm, and 633 nm to 645 nm) is close to 100%, while the transmittance for lasers with other wavelengths is close to 0 ( FIG5 exemplifies the transmittance of 0).

[0160] As shown in Figure 5 , the transmittance curve of the dichroic mirror 3 in the embodiment of the present application exhibits a square wave shape with a relatively steep edge slope, resulting in a significant change in transmittance within a very short wavelength range. For example, the transmittance of the dichroic mirror 3 for laser light with a wavelength of 471 nanometers is close to 100%, while the transmittance for laser light with a wavelength of 473 nanometers is close to 0%. As a result, laser light outside the target wavelength range is essentially prevented from passing through the dichroic mirror 3.

[0161] In this embodiment of the present application, the dichroic mirror 3 may have high transmittance only for light within the target wavelength range, while having high reflectivity for all light outside the target wavelength range. This ensures that the dichroic mirror 3 transmits light within the target wavelength range while minimizing the transmission of light outside the target wavelength range but close to the target wavelength range, thus preventing color mixing of different colors. Since the fluorescence emitted by the fluorescence conversion device 4 in this embodiment needs to be reflected by the dichroic mirror 3, and the wavelength range of the fluorescence is relatively wide, it may overlap with the target wavelength range. In this embodiment of the present application, the dichroic mirror 3 also has high reflectivity for light outside the target wavelength range but close to the target wavelength range, ensuring that as much fluorescence as possible is reflected by the dichroic mirror 3, minimizing the amount of fluorescence lost by passing through the dichroic mirror 3. Furthermore, the wavelength difference threshold in this embodiment of the present application is relatively low. Even if some fluorescence is lost by passing through the dichroic mirror 3, the amount of fluorescence that is transmitted is relatively small, minimizing fluorescence loss and maintaining high fluorescence extraction efficiency.

[0162] For the light source device 100 provided in the embodiment of the present application, one implementation method of the output element 5 is, referring to Figure 1 or Figure 17, the output element 5 is an exit lens 51, the fluorescence of the second band and the laser of the second band are combined and emitted by the exit lens 51, and the fluorescence of the third band and the laser of the third band are combined and emitted by the exit lens 51.

[0163] Another implementation of the output element 5 is, referring to Figure 8, Figure 13 or Figure 14, the output element 5 includes an exit lens 51 and a color filter wheel 8; the color filter wheel 8 includes a first filter area 81, a second filter area 82 and a transmission area 83, and the color filter wheel 8 is configured to rotate so that different areas receive light emitted from the exit lens 51; the first filter area 81 is used to receive the target fluorescence and the second-band laser from the exit lens 51, and the first filter area 81 filters the target fluorescence to obtain the fluorescence of the second band, and the fluorescence of the second band and the laser of the second band are combined and emitted by the first filter area 81; the second filter area 82 is used to receive the target fluorescence and the third-band laser from the exit lens 51, and the second filter area 82 filters the target fluorescence to obtain the fluorescence of the third band, and the fluorescence of the third band and the laser of the third band are combined and emitted by the second filter area 82; the transmission area 83 is used to receive the first-band laser from the exit lens 51.

[0164] In some implementations, any light source device involved in the embodiments of the present application further includes at least one of the following components: a first collimating lens 6 , a focusing lens 7 , a first light homogenizer 9 , and a second light homogenizer 10 .

[0165] The first collimator 6 is located between at least one of the first laser light source group 1 and the second laser light source group 2 and the dichroic mirror 3. For example, a first collimator 6 is disposed between the first laser light source group 1 and the dichroic mirror 3, and between the second laser light source group and the dichroic mirror 3. This is applicable to situations where the light emission directions of the first laser light source group 1 and the dichroic mirror 3 are different. Alternatively, for another example, the first collimator 6 is located between both the first laser light source group 1 and the second laser light source group 2 and the dichroic mirror 3. This is applicable to situations where the light emission directions of the first laser light source group 1 and the dichroic mirror 3 are parallel.

[0166] The first collimator 6 may include at least one lens. For example, FIG. 24 illustrates that the first collimator 6 includes two lenses sequentially distributed along the light emitting direction.

[0167] By providing the first collimating lens 6 , the blue laser light provided by the first laser light source group 1 and the laser lights of various colors provided by the second laser light source group 2 can be collimated and shaped to reduce the laser spot size.

[0168] The focusing mirror 7 is located between the dichroic mirror 3 and the fluorescence conversion device 4. The focusing mirror 7 can focus the laser light emitted from the dichroic mirror 3 and emit it to the fluorescence conversion device to avoid laser loss.

[0169] The first light homogenizer 9 can be located between at least one of the first laser light source group 1 and the second laser light source group 2 and the dichroic mirror 3, or can also be located between the first collimator 6 and the dichroic mirror 3. The first light homogenizer 9 can exist in the form of a light homogenizer layer, and further, a diffuser can be used to form the first light homogenizer 9.

[0170] The laser energy emitted by the first laser light source group 1 and the second laser light source group 2 is relatively high. In order to avoid the laser speckle problem and to prevent the laser energy incident on the fluorescence conversion device 4 from being too high and thus reducing the fluorescence conversion efficiency, a first light homogenizer 9 is provided in the optical path to homogenize the laser.

[0171] The second light diffuser 10 is located on the light-exiting side of the output element 5, including the light-exiting side of the exit lens 51 or the light-exiting side of the color filter wheel 8. For example, FIG14 illustrates the second light diffuser 10 being disposed on the light-exiting side of the color filter wheel 8. FIG27 illustrates the second light diffuser 10 being disposed on the light-exiting side of the exit lens 51 of the output element 5. For example, the second light diffuser 10 can be a light rod, a light pipe, or the like.

[0172] The three primary colors of light finally emitted by the light source device 100 need to be further homogenized by the second light homogenizer 10 before being incident on the display component. Therefore, a second light homogenizer 10 is set at the light outlet of the light source device 100, and an exit lens 51 is set before the second light homogenizer 10 to converge the light, so that as much light as possible is incident on the second light homogenizer 10 and utilized.

[0173] The light source device 100 of the embodiment of the present application can be a combination of the above-mentioned multiple implementations, so that the light source device 100 of the embodiment of the present application has multiple implementation schemes. The following is an exemplary description of some typical light source devices 100 in conjunction with the drawings of the present application.

[0174] In some implementations (1), referring to FIG1 , FIG3 , FIG4 , FIG8 , FIG13 and FIG14 , the light output path of the light source device 100 is a first light output path, and the first light output path includes: for a light beam emitted by a laser of the first wavelength band alone, the laser of the first wavelength band is emitted via a dichroic mirror 3, a fluorescence conversion device 4, a dichroic mirror 3 and an output element 5. For a light beam emitted by a laser of the second wavelength band and a fluorescence of the second wavelength band combined, the laser of the second wavelength band is emitted via a dichroic mirror 3 and an output element 5, and is combined with the fluorescence of the second wavelength band at the output element 5. For a light beam emitted by a laser of the third wavelength band and a fluorescence of the third wavelength band combined, the laser of the third wavelength band is emitted via a dichroic mirror 3 and an output element 5, and is combined with the fluorescence of the third wavelength band at the output element 5.

[0175] Based on the above-mentioned first light output path, as shown in Figure 1, the first laser light source group 1, the dichroic mirror 3, the focusing lens 7, and the fluorescence conversion device 4 can be arranged in sequence along a first direction (e.g., the x-direction). The second laser light source group 2, the dichroic mirror 3, and the output element 5 can be arranged in sequence along a second direction (e.g., the y-direction). The first direction intersects the second direction, and the embodiment of the present application takes the first direction as an example, which is perpendicular to the second direction.

[0176] In conjunction with Figure 1, the working principle of the light source device 100 involved in implementation method (1) is exemplarily explained. A focusing mirror 7 is arranged in Figure 1, so the focusing mirror 7 will be involved in the following description, which does not exclude the technical solution where the focusing mirror 7 does not exist.

[0177] In Figure 1 of the present embodiment, dashed lines with arrows are used to schematically represent light. These dashed lines are only used to illustrate the light transmission path. The difference in the number of dashed lines at each location does not represent the actual difference in the amount of light at that location. As shown in Figure 1, the target laser is used to identify the laser light emitted by the second laser light source group 2.

[0178] As shown in FIG1 , the dichroic mirror 3 is used to transmit the multiple-color lasers and the blue laser. The multiple-color lasers can then pass through the dichroic mirror 3 toward the output element 5, where they are then focused and emitted. The blue laser can then pass through the dichroic mirror 3 toward the focusing lens 7, which is used to focus the blue laser light received from the dichroic mirror 3 onto the fluorescence conversion device 4.

[0179] Taking the fluorescence conversion device 4 in the form of a fluorescence wheel as an example, the fluorescence conversion region 411 in the fluorescence conversion device 4 is configured to emit fluorescence under the stimulation of received blue laser light. This fluorescence can be directed toward the focusing lens 7, which is configured to direct the received fluorescence toward the dichroic mirror 3 in a direction opposite to the first direction. The laser output region 412 in the fluorescence conversion device 4 is configured to transmit or reflect the received blue laser light. The blue laser light that passes through the laser output region can subsequently be directed toward the dichroic mirror 3. Figure 1 uses the laser output region 412 as an example, which is configured to transmit the received blue laser light. The blue laser light that is transmitted from the laser output region can be transmitted to the dichroic mirror 3 through other optical components.

[0180] The dichroic mirror 3 is used to reflect the received fluorescence toward the output element 5, so that the fluorescence can be focused by the exit lens 51 of the output element 5 and then emitted for subsequent use. The dichroic mirror 3 is also used to reflect the received blue laser light that has passed through the laser emission area 412 toward the output element 5, so that the blue laser light can be focused by the exit lens 51 of the output element 5 and then emitted.

[0181] Exit lens 51 converges the incoming light and then emits it. The light emitted by exit lens 51 is used to form the projection image. As can be seen, the light emitted by exit lens 51 includes: blue laser light originating from first laser light source group 1 and passing through laser emission region 412 of fluorescence conversion device 4; fluorescence light emitted from fluorescence conversion region 411 of fluorescence conversion device 4; and laser light of various other colors originating from second laser light source group 2.

[0182] The fluorescence emitted from the fluorescence conversion area 411 of the fluorescence conversion device 4 can be emitted toward the focusing lens 7 within a larger light-emitting angle range. For example, the fluorescence can be parallel light after passing through the focusing lens 7. Since the fluorescence area in the fluorescence wheel is similar to a Lambertian body in emitting light, and emits light toward the entire surface of the focusing lens 7, the focusing lens 7 can collimate the incident light so that the light is emitted in the form of a whole beam similar to parallel light. In the embodiment of the present application, the focusing lens 7 is taken as an example in which the focusing lens 7 is only a convex lens. For example, the focusing lens 7 can also be composed of multiple lenses to improve the focusing effect of the focusing lens 7 on light.

[0183] Based on this implementation (1), one arrangement of the fluorescence conversion device 4 is to use the fluorescence conversion device 4 in the form of the fluorescence wheel mentioned above (see FIG1 ). Another arrangement of the fluorescence conversion device 4 is to use a fluorescence conversion device 4 including a dynamic optical component 421, a fluorescence conversion component 422, and a heat dissipation component 423 (see FIG15 ).

[0184] Taking a fluorescence wheel-shaped fluorescence conversion device 4 as an example, the emission timing of the second laser light source group 2 can be matched to the rotation of the fluorescence wheel-shaped fluorescence conversion device 4. For example, the second laser light source group 2 is configured to emit laser light of a first color and laser light of a second color. The fluorescence conversion region 411 of the fluorescence conversion device 4 includes a subregion for emitting fluorescence of the first color and a subregion for emitting fluorescence of the second color.

[0185] Taking the example of a first color of red and a second color of green, for ease of description, the subregion of the fluorescence conversion zone 411 of the fluorescence conversion device 4 that emits fluorescence of a certain color is referred to below as the fluorescence zone of that color. For example, the subregion that emits red fluorescence is referred to as the red fluorescence zone. When the fluorescence conversion device 4 rotates so that the red fluorescence zone receives blue laser light, the second laser light source group 2 can emit red laser light. When the green fluorescence zone of the fluorescence conversion device 4 receives blue laser light, the second laser light source group 2 can emit green laser light. When the laser output zone 412 of the fluorescence conversion device 4 receives blue laser light, the second laser light source group 2 may not emit laser light. For example, the second laser light source group 2 can also emit blue laser light. When the laser output zone 412 of the fluorescence conversion device 4 receives blue laser light, the second laser light source group 2 can emit blue laser light. This ensures that each color of laser light emitted by the second laser light source group 2 is mixed with the fluorescence of that color, facilitating subsequent time-sharing modulation of the different colors of light emitted by the light source device 100.

[0186] For example, the fluorescence conversion zone 411 of the fluorescence conversion device 4 can be configured to be excited to produce fluorescence of only one color. This fluorescence can be converted into fluorescence of multiple colors through subsequent processing. These multiple colors of fluorescence can be the same as the colors of laser light other than blue emitted by the second laser light source group 2. For example, the second laser light source group 2 emits laser light of a first color and laser light of a second color. The fluorescence conversion zone 411 can be configured to be excited to produce only yellow fluorescence. This yellow fluorescence can be converted into fluorescence of the first color and fluorescence of the second color through subsequent processing (e.g., filtering). The first color can be red, and the second color can be green.

[0187] Based on the implementation (1), the laser light of the first wavelength band from the fluorescence conversion device 4 is transmitted to the output element 5 through the dichroic mirror 3. That is, the laser output area 412 is a transmission area, and the blue laser light emitted by the first laser light source group 1 is transmitted through the dichroic mirror 3 and transmitted from the laser output area 412 of the fluorescence conversion device 4 to the dichroic mirror 3. In this case, as shown in FIG1 , the light source device 100 further includes: an optical path adjustment lens group 13 and a second collimating lens 14; the second collimating lens 14 is used to collimate the laser light of the first wavelength band from the fluorescence conversion device 4 and then direct it to the optical path adjustment lens group 13; the optical path adjustment lens group 13 is used to direct the received laser light of the first wavelength band to the dichroic mirror 3, and the dichroic mirror 3 is used to transmit the laser light of the first wavelength band received from the optical path adjustment lens group 13 to the output element 5.

[0188] For example, if the laser light in the first wavelength band is blue laser light, the laser light in the second wavelength band is red laser light, and the laser light in the third wavelength band is green laser light, as shown in FIG1 , the blue laser light emitted by the focusing lens 7 can be transmitted from the laser light exit area 412. The light source device 100 may further include an optical path adjustment lens group 13. The blue laser light transmitted from the laser light exit area 412 can be directed toward the optical path adjustment lens group 13, and then transmitted back to the dichroic mirror 3 by the optical path adjustment lens group 13, so as to pass through the dichroic mirror 3 and be emitted toward the output element 5 (specifically, the exit lens 51). In this optional implementation, the light transmission and reflection characteristics of each position in the dichroic mirror 3 can be the same.

[0189] For example, as shown in FIG1 , the optical path adjustment lens assembly 13 may include a first lens 131, a second lens 132, and a third lens 133. The third lens 133 may be located between the second laser light source group 2 and the dichroic mirror 3. The first lens 131 and the second lens 132 may be reflectors. The third lens 133 may have dichroic properties, and is configured to reflect the blue laser light emitted by the first laser light source group 1 and transmit laser light of various other colors emitted by the second laser light source group 2. The laser output region 412 in the fluorescence conversion device 4 may transmit the received blue laser light toward the first lens 131.

[0190] The first lens 131 reflects the blue laser light toward the second lens 132, which in turn reflects the blue laser light toward the third lens 133. The third lens 133 then reflects the blue laser light toward the dichroic mirror 3. The multi-colored laser light emitted by the second laser light source group 2 may also be directed toward the third lens 133. The third lens 133 can transmit the laser light emitted by the second laser light source group 2, allowing the laser light to be transmitted to the dichroic mirror 3, and then transmitted by the dichroic mirror 3 to the exit lens 51. The optical path adjustment lens group 13 may also include a convex lens (not shown) located between the second lens 132 and the third lens 133. The convex lens can be used to shape the laser light emitted by the second lens 132 before directing it toward the third lens 133.

[0191] For example, FIG3 is a schematic structural diagram of another light source device provided in an embodiment of the present application. As shown in FIG3 , based on FIG1 , the light source device 100 may further include a second collimator 14. The second collimator 14 may be located between the fluorescence conversion device 4 and the optical path adjustment lens group 13, such as between the fluorescence conversion device 4 and the first lens 131. The laser output area 412 in the fluorescence conversion device 4 may transmit the received blue laser light to the second collimator 14. The blue laser light may be collimated by the second collimator 14 into nearly parallel light and then emitted to the first lens 131. Thereafter, the blue laser light passes through the optical path adjustment lens group 13 and is emitted to the dichroic mirror 3. The second collimator 14 may be the same lens as the focusing lens 7. The second collimator 14 may be symmetrical to the focusing lens 7 with respect to the fluorescence conversion device 4.

[0192] After the blue laser light emitted by the first laser light source assembly 1 is converged by the focusing lens 7 to the fluorescence conversion device 4 and then emitted, the light output angle of the blue laser light becomes more divergent. In the embodiment of the present application, the blue laser light is collimated by the second collimating lens 14 before subsequent transmission, which can ensure that the energy of the blue laser light is more concentrated during the transmission process and ensure high transmission efficiency of the blue laser light. In addition, the light spot formed by the blue laser light during transmission can be smaller, and the size of the lens in the optical path adjustment lens assembly 13 only needs to be small to achieve reflection of the blue laser light, which is conducive to the miniaturization of the light source device 100.

[0193] In the light source device 100 shown in Figures 1 and 3 in the embodiments of the present application, the third lens 133 in the optical path adjustment assembly 107 has dichroic properties, and the characteristics of the third lens 133 can be similar to those of the dichroic mirror 3. For example, the transmittance of the third lens 133 for light with a wavelength within the auxiliary wavelength range can be greater than a first probability threshold, and the transmittance for light with a wavelength outside the target wavelength range can be less than a second probability threshold. The wavelengths in the auxiliary wavelength range satisfy the following conditions: the absolute value of the wavelength difference from the center wavelength of any color of laser light emitted by the second laser light source group 2 is less than a wavelength difference threshold. For details about the first probability threshold, the second probability threshold, and the wavelength difference threshold, please refer to the relevant content in the above introduction to the dichroic mirror 3, and will not be repeated in this embodiment of the present application.

[0194] Assume that the second laser light source group 2 is used to emit red laser and green laser, the center wavelength of the red laser is 639 nanometers, the center wavelength of the green laser is 525 nanometers, and the wavelength difference threshold is 6 nanometers. Under this assumption, the auxiliary wavelength ranges of the laser whose transmittance on the third lens 133 is greater than the first probability threshold include: 519 nanometers to 531 nanometers and 633 nanometers to 645 nanometers. Figure 6 is a relationship diagram of the transmittance of light and the wavelength of light provided by a third lens in an embodiment of the present application. In the coordinate system shown in Figure 6, the horizontal axis represents the wavelength of the light, and the vertical axis represents the transmittance of the third lens 133 for light of various wavelengths. As shown in Figure 6, under the above assumptions, the transmittance of the dichroic mirror 3 for lasers with wavelengths in the range of 519 nanometers to 531 nanometers and 633 nanometers to 645 nanometers is close to 100%, while the transmittance for lasers of other wavelengths is close to 0 (Figure 6 takes the transmittance of 0 as an example).

[0195] For example, the auxiliary wavelength range for laser light with a transmittance greater than the first probability threshold through the third lens 133 may also include all wavelengths between the center wavelengths of the red laser and the green laser. Figure 7 shows a graph showing the relationship between the transmittance of light and the wavelength of light for a third lens according to an embodiment of the present application. As shown in Figure 7, the auxiliary wavelength range may be 519 to 645 nanometers.

[0196] Based on this implementation (1), the laser light of the first wavelength band from the fluorescence conversion device 4 is reflected to the output element 5 by the dichroic mirror 3. In other words, the laser output area 412 is a reflection area. In this case, as shown in FIG4 , the dichroic mirror 3 includes a first area 311 and a second area 312; the first area 311 is used to receive the laser light of the first wavelength band from the first laser light source group 1 and transmit it to the fluorescence conversion device 4; the second area 312 is used to receive the laser light of the first wavelength band from the first area 311 and reflect it to the output element 5 (specifically, the exit lens 51); the first area 311 and the second area 312 are also used to transmit the laser light of the second wavelength band or the laser light of the third wavelength band from the second laser light source group 2 to the output element 5 (specifically, the exit lens 51).

[0197] Taking the laser of the first wavelength band as a blue laser, the laser of the second wavelength band as a red laser, and the laser of the third wavelength band as a green laser as an example, as shown in FIG4 , the laser output area 412 can reflect the received blue laser, and the reflected blue laser can then pass through the focusing mirror 7 and be emitted toward the dichroic mirror 3, and then be reflected by the dichroic mirror 3 toward the exit lens 51.

[0198] The first and second regions 311, 312 of the dichroic mirror 3 may have different transmissive and reflective properties. The first region 311 may be configured to transmit the blue laser light emitted by the first laser light source group 1, while the second region 312 may be configured to reflect the blue laser light. Furthermore, both the first and second regions 311, 312 may be configured to transmit the laser light emitted by the second laser light source group 2 and to reflect the fluorescence emitted by the fluorescence conversion region 411 of the fluorescence conversion device 4.

[0199] For example, the blue laser light emitted by the first laser light source group 1 can be directed toward the first region 311 in the dichroic mirror 3. The blue laser light can be transmitted by the first region 311 toward the focusing lens 7, and then focused by the focusing lens 7 toward the fluorescence conversion device 4. The blue laser light can bypass the optical axis of the focusing lens 7. When the laser light exiting region 412 in the fluorescence conversion device 4 receives the blue laser light, the blue laser light can be reflected by the laser light exiting region 412 and then reflected back to the focusing lens 7. The focusing lens 7 can then direct the blue laser light toward the second region 312 in the dichroic mirror 3. The second region 312 can reflect the blue laser light and direct it toward the exit lens 51.

[0200] For example, the fluorescence conversion device 4 can be located at the focal plane of the focusing lens 7. On the focusing lens 7, the orthographic projection of the first area 311 and the orthographic projection of the second area 312 can be symmetrical about the optical axis of the focusing lens 7. This ensures that the blue laser light emitted from the first area 311, after passing through the focusing lens 7, impinges on the fluorescence conversion device 4 at the focal point of the focusing lens 7, which passes through the optical axis of the focusing lens 7. Furthermore, after being reflected by the laser emission area 412, the blue laser light can be emitted to a position symmetrical to the first area 311, thereby being more accurately reflected toward the second area 312.

[0201] In the present embodiment, the first and second regions 311, 312 are used as examples of two independent regions arranged sequentially in the dichroic mirror 3. For example, the first and second regions 311, 312 may each include multiple, spaced subregions, with each subregion in the first region 311 corresponding to a subregion in the second region 312. Blue laser light transmitted from a subregion in the first region 311, after being reflected by the laser exit region 412 in the fluorescence conversion device 4, may be directed toward the corresponding subregion in the second region 312, where it is then reflected by the corresponding subregion toward the exit lens 51. The two corresponding subregions may be symmetrical about the optical axis of the focusing lens 7, while the different subregions in the first region 311 may not be symmetrical about the optical axis of the focusing lens 7. This ensures that blue laser light incident on a subregion in the first region 311 is reflected by a subregion in the second region 312 after reflection, rather than being transmitted through other subregions in the first region 311, thereby avoiding waste of blue laser light. This approach will not be described in detail in the present embodiment.

[0202] Based on this implementation (1), one arrangement of the output element 5 is as follows, referring to FIG1 , wherein the output element 5 is an exit lens 51, and the fluorescence of the second wavelength band and the laser light of the second wavelength band are combined and emitted by the exit lens 51, and the fluorescence of the third wavelength band and the laser light of the third wavelength band are combined and emitted by the exit lens 51. Another implementation of the output element 5 is as follows, referring to FIG8 , FIG13 , or FIG14 , wherein the output element 5 includes the exit lens 51 and the color filter wheel 8.

[0203] FIG8 is a schematic structural diagram of another light source device based on implementation method (1). As shown in FIG8 , based on any of the above-mentioned light source devices 100, FIG8 is schematically illustrated based on the light source device 100 shown in FIG3 , and the light source device 100 may further include: a color filter wheel 8, the color filter wheel 8 is located on the light-emitting side of the exit lens 51, and the light emitted by the exit lens 51 can be emitted after passing through the color filter wheel 8 and then be subsequently utilized. The structure of the color filter wheel 8 can be similar to the structure of the fluorescence conversion device 4 in the form of a fluorescence wheel. The color filter wheel 8 can include a filter area and a transmission area. The filter area is similar to the fluorescence conversion area 411 in the fluorescence conversion device 4, and the transmission area is similar to the laser emission area 412 in the fluorescence conversion device 4. The structure and area division of the color filter wheel 8 can refer to the above-mentioned introduction to the fluorescence conversion device 4.

[0204] For example, Figure 9 is a schematic diagram of the structure of a color filter wheel according to an embodiment of the present application. As shown in Figure 9, the color filter wheel 8 includes a first filter area 81, a second filter area 82, and a transmission area 83. The color filter wheel is configured to rotate so that different areas receive light emitted from the exit lens 51.

[0205] The first filter area 81 filters the target fluorescence to obtain fluorescence of the second band, and the fluorescence of the second band and the laser of the second band are combined and emitted by the first filter area 81; the second filter area 82 is used to receive the target fluorescence and the laser of the third band from the exit lens 51, and the second filter area 82 filters the target fluorescence to obtain fluorescence of the third band, and the fluorescence of the third band and the laser of the third band are combined and emitted by the second filter area 82; the transmission area 83 is used to receive the laser of the first band from the exit lens 51.

[0206] For example, the laser in the first wavelength band is blue, the laser in the second wavelength band is red, and the laser in the third wavelength band is green. The fluorescence in the second wavelength band is red, and the fluorescence in the third wavelength band is green. The first filter region 81 is used to filter the red fluorescence and red laser from the exit lens 51 before emitting them. The second filter region 82 is used to filter the filtered fluorescence and green laser from the exit lens 51 before emitting them. The transmission region 83 of the color filter wheel is used to transmit the blue laser from the exit lens 51.

[0207] The rotation mode of the color filter wheel 8 can refer to the above description of the rotation mode of the fluorescence conversion device 4, and will not be described in detail in this application.

[0208] The rotation of the color filter wheel 8, the rotation of the fluorescence conversion device 4, and the light emission timing of the second laser light source group 2 can all be matched. Due to the small size of the light source device 100, the time required for the laser to be transmitted between the different components of the light source device 100 is very short, and this time is not considered in the embodiments of the present application.

[0209] When the second laser light source group 2 emits red and green lasers, the fluorescence conversion device 4 rotates so that the fluorescence conversion area 411 receives the blue laser light emitted by the focusing lens 7. Furthermore, when the second laser light source group 2 emits red laser light, the color filter wheel 8 rotates so that the first filter area 81 receives the light emitted by the exit lens 51. When the second laser light source group 2 emits green laser light, the color filter wheel 8 rotates so that the second filter area 82 receives the light emitted by the exit lens 51.

[0210] Thus, when the second laser light source assembly 2 emits red laser light, the red laser light is transmitted to the first filter region 81. The target fluorescence (e.g., yellow fluorescence) excited by the fluorescence conversion region 411 is also emitted to the first filter region 81. The target fluorescence is then filtered by the first filter region 81 to produce red fluorescence, which is then emitted. This allows the red laser light and the red fluorescence to be mixed and emitted from the first filter region 81.

[0211] Similarly, when the second laser light source assembly 2 emits green laser light, the target fluorescence (e.g., yellow fluorescence) excited by the fluorescence conversion region 411 is incident on the second filter region 82, where it is filtered to obtain green fluorescence, which is then emitted. This allows the green laser light and the green fluorescence to be mixed and emitted in the second filter region 82.

[0212] Exemplarily, the fluorescence conversion region 411 of the fluorescence conversion device 4 may include a fluorescence region of a first color and a fluorescence region of a second color. For example, if the first color is red and the second color is green, when the second laser light source group 2 emits laser light of the first color, the fluorescence conversion device 4 can rotate so that the fluorescence region of the first color receives the blue laser light emitted by the focusing lens 7, and the color filter wheel 8 rotates so that the first filter region 81 receives the light emitted by the exit lens 51. When the second laser light source group 2 emits laser light of the second color, the fluorescence conversion device 4 can rotate so that the fluorescence region of the second color receives the blue laser light emitted by the focusing lens 7, and the color filter wheel 8 rotates so that the second filter region 82 receives the light emitted by the exit lens 51. The fluorescence excited by the fluorescence region has a wide wavelength range (e.g., the wavelength may be within a range of plus or minus 30 nanometers of the center wavelength), and the purity of this fluorescence is relatively low. In the embodiment of the present application, the first color fluorescence emitted by the first color fluorescence area is filtered by the first filter area 81, and the second color fluorescence emitted by the second color fluorescence area is filtered by the second filter area 82. This can narrow the wavelength range of the emitted fluorescence and improve the purity of the fluorescence. For example, after filtering by the filter areas, the wavelength of the fluorescence can be within a range of plus or minus 10 nanometers of the center wavelength.

[0213] When the fluorescence conversion device 4 rotates to make the laser emission area 412 receive the blue laser emitted by the focusing lens 7, the color filter wheel 8 can rotate to make the transmission area 83 receive the light emitted by the exit lens 51. In this way, the blue laser is emitted from the transmission area 83.

[0214] It is not excluded that the second laser light source group 2 can also emit blue laser light. That is, the multiple colors of laser light emitted by the second laser light source group 2 also include blue laser light, and the center wavelength of the blue laser light in the multiple colors of laser light is different from the center wavelength of the blue laser light emitted by the first laser light source group 1.

[0215] When the second laser light source group 2 emits blue laser light, the fluorescence conversion device 4 rotates so that the laser emission area 412 receives the blue laser light emitted by the focusing lens 7, and the color filter wheel 8 rotates so that the transmission area 83 receives the light emitted by the exit lens 51. This allows the blue laser light from the second laser light source group 2 and the blue laser light from the first laser light source group 1 to be mixed and emitted at the transmission area 83 of the color filter wheel 8, thereby increasing the brightness of the blue laser light forming the projected image.

[0216] For example, a diffusion film may be provided on the light-emitting surface of the color filter wheel 8. The diffusion film may homogenize the light obtained after filtering by the color filter wheel 8 before emitting the light, thereby further reducing the speckle effect in the projection image formed by the light and improving the display effect of the projection image.

[0217] Based on the light source device 100 described in the above-mentioned implementation method (1), as shown in Figure 14, the light source device 100 also includes at least one of the following components: a first diffuser 16, a second diffuser 17, a beam reducing mirror group 18, and a light combining mirror group 19. The first diffuser 16 is located between the first laser light source group 1 and the dichroic mirror 3. The blue laser emitted by the first laser light source group 1 is diffused by the first diffuser 16 and then emitted to the dichroic mirror 3. The second diffuser 17 is located on the light-emitting side of the second laser light source group 2. The lasers of multiple colors emitted by the second laser light source group 2 are diffused by the second diffuser 17 and then emitted to the dichroic mirror 3. The beam reducing mirror group 18 is used to reduce the received blue laser light and then emit it to the dichroic mirror 3. The light combining mirror group 19 is used to make the emission positions of at least two colors of laser light from the multiple colors of laser light emitted from the second laser light source group 2 close to each other.

[0218] FIG13 is a structural diagram of another light source device based on implementation method (1). As shown in FIG13 , based on any of the above-mentioned light source devices 100, FIG13 is schematically illustrated based on the light source device 100 shown in FIG8 , and the light source device 100 may further include a light combining lens group 19, which may be located on the light-emitting side of the second laser light source group 2. The lasers of various colors emitted by the second laser light source group 2 may be directed toward the light combining lens group 19, which may allow the emission positions of at least two colors of the lasers of various colors to be close to each other, so as to mix the lasers of various colors and emit them. In this way, the light spots of the at least two colors of lasers have a high degree of overlap, and the distribution uniformity of the at least two color components in the projection image formed based on the at least two colors of lasers is high. Exemplarily, the optical axis of the light combining lens group 19 may be collinear with the optical axis of the exit lens 51.

[0219] Exemplarily, the light combining lens group 19 may include two light combining lenses. The laser light of the first color and the laser light of the second color emitted by the second laser light source group 2 may be directed toward the two light combining lenses respectively, and one light combining lens reflects the laser light (such as the laser light of the second color) directed toward it toward the other light combining lens, and the other light combining lens may be a dichroic mirror. The other light combining lens may reflect the laser light (such as the laser light of the first color) received from the second laser light source group 2, and transmit the laser light (such as the laser light of the second color) received from the light combining lens, thereby achieving the mixing of the laser light of the first color and the laser light of the second color and then emitting them. The positions where the laser light of the first color and the laser light of the second color are emitted on the light combining lens group 19 may overlap.

[0220] For example, the polarization directions of the first color laser and the second color laser can be perpendicular. In the embodiment of the present application, a half-wave plate can be further provided in the transmission path of the first color laser or the second color laser to rotate the polarization of either the first color laser or the second color laser by 90 degrees so that the polarization directions of the first color laser and the second color laser are the same, thereby improving the display effect of the subsequently formed projection image.

[0221] Exemplarily, the light source device 100 may further include a first diffuser 16 located between the first laser light source group 1 and the dichroic mirror 3 . The blue laser light emitted by the first laser light source group 1 is diffused by the first diffuser 16 and then emitted toward the dichroic mirror 3 .

[0222] Exemplarily, the light source device 100 may further include a second diffuser 17 located on the light-emitting side of the second laser light source group 2 . The laser lights of multiple colors emitted by the second laser light source group 2 are diffused by the second diffuser 17 and then emitted to the dichroic mirror 3 .

[0223] Exemplarily, the light source device 100 may further include a beam reducing mirror group 18 . The blue laser light emitted by the first laser light source group 1 is directed toward the beam reducing mirror group 18 . The beam reducing mirror group 18 is configured to reduce the received blue laser light and then direct it toward the dichroic mirror 3 .

[0224] FIG14 is a structural schematic diagram of another light source device based on implementation method (1). As shown in FIG14 , based on any of the above-mentioned light source devices 100, FIG14 is schematically illustrated based on the light source device 100 shown in FIG8 , and the light source device 100 may further include a beam reducing mirror group 18, a first diffuser 16, and a second diffuser 17. The first laser light source group 1, the beam reducing mirror group 18, the first diffuser 16, and the dichroic mirror 3 may be arranged in sequence along the first direction. The beam reducing mirror group 18 may include a convex lens and a concave lens, and the beam reducing mirror group 18 may reduce the blue laser light emitted by the first laser light source group 1 and then emit it. The blue laser light emitted by the beam reducing mirror group 18 may be diffused by the first diffuser 16 and then pass through the dichroic mirror 3 to irradiate the fluorescence conversion device 4. Since the laser light emitted by the laser is Gaussian light, the energy in the central region is the highest, while the energy in the edge region is lower. The power density of the laser light irradiated on the fluorescence conversion device 4 is too high, resulting in a low fluorescence excitation efficiency of the fluorescence conversion zone 411 in the fluorescence conversion device 4. In the embodiment of the present application, the blue laser is homogenized by the first diffuser 16 and then used to excite the fluorescence conversion area 411 in the fluorescence conversion device 4 to emit fluorescence. This can make the energy distribution of each position in the irradiation area of ​​the blue laser more uniform, thereby improving the fluorescence excitation efficiency.

[0225] A second diffuser 17 can be located between the second laser light source assembly 2 and the dichroic mirror 3. The laser light emitted by the second laser light source assembly 2 is diffused and homogenized by the second diffuser 17 before being transmitted. This ensures a high degree of uniformity in the light emitted by the light source assembly, thereby reducing speckle in the resulting projection image.

[0226] 14 , the light source device 100 may further include a second light homogenizer 10 located on the light-emitting side of the color filter wheel 8. The second light homogenizer 10 is used to homogenize the light emitted from the color filter wheel 8 and then direct it into a subsequent optical path for subsequent use of the light emitted by the light source device.

[0227] In summary, for the light source device provided by the above-mentioned implementation method (1), a blue laser can be used to excite the fluorescent area of ​​the fluorescent wheel to emit fluorescence, and then a projection screen is formed based on the blue laser emitted by the first laser light source group 1, the fluorescence emitted by the fluorescence conversion device 4 in the form of a fluorescent wheel, and the lasers of multiple colors emitted by the second laser light source group 2. Since fluorescence is not coherent, the use of a mixture of fluorescence and laser to form a projection screen can reduce the overall coherence of the light forming the projection screen and weaken the speckle effect in the projection screen. In addition, the second laser light source group provides the multiple colors of laser light required to form the projection screen, which can ensure that the brightness of the formed projection screen is high and the color saturation is high. Therefore, the display effect of the projection screen formed based on the light emitted by the light source device is better.

[0228] In some implementations (2), referring to FIG17 , FIG24 to FIG27 and FIG29 , the light output path of the light source device 100 is a second light output path, and the second light output path includes: for a light beam emitted by the laser of the first wavelength band alone, the laser of the first wavelength band is emitted via the dichroic mirror 3, the fluorescence conversion device 4, the dichroic mirror 3, and the exit lens 51. For a light beam emitted by the laser of the second wavelength band and the fluorescence of the second wavelength band combined, the laser of the second wavelength band is emitted via the dichroic mirror 3, the fluorescence conversion device 4, the dichroic mirror 3, and the exit lens 51, and is combined with the fluorescence of the second wavelength band at the exit element 5. For a light beam emitted by the laser of the third wavelength band and the fluorescence of the third wavelength band combined, the laser of the third wavelength band is emitted via the dichroic mirror 3, the fluorescence conversion device 4, the dichroic mirror 3, and the exit lens 51, and is combined with the fluorescence of the third wavelength band at the exit element 5.

[0229] In this case, as shown in Figure 17, the dichroic mirror 3 includes a first part 321, a second part 322, a third part 323 and a fourth part 324 arranged side by side in sequence, the second part 322 is located on the light output path of the first laser light source group 1, and the fourth part 324 is located on the light output path of the second laser light source group 2; the second part 322 is used to transmit the laser light of the first band, the fourth part 324 is used to transmit at least the laser light of the second band and the laser light of the third band, and the first part 321 and the third part 323 are used to reflect the laser light of the first band, the laser light of the second band or the laser light of the third band and fluorescence.

[0230] For example, if the laser beam in the first wavelength band is blue, the laser beam in the second wavelength band is red, and the laser beam in the third wavelength band is green, the second portion 322 is located on the light output path of the first laser light source group 1 and is used to transmit the blue laser beam. The fourth portion 324 is located on the light output path of the second laser light source group 2 and is used to transmit the red and green laser beams. The first portion 321 and the third portion 323 are used to reflect the blue laser beam, multiple laser beams, and fluorescent light, thus adapting to the second light output path.

[0231] The fluorescence emitted by the fluorescence conversion component 422 , the reflected red laser / green laser, and the reflected blue laser can all be reflected in a set direction by the first portion 321 and the third portion 323 , thereby achieving the emission of three primary color lights.

[0232] Based on the second light emission path mentioned above, as shown in Figures 17 and 29, the first laser light source group 1 and the second laser light source group 2 are arranged side by side, so that the light emission directions of the first laser light source group 1 and the second laser light source group 2 are parallel to each other. Furthermore, Figure 17 illustrates the integrated arrangement of the first laser light source group 1 and the second laser light source group 2 to form a laser light source array. Figure 29 illustrates the independent arrangement of the first laser light source group 1 and the second laser light source group 2.

[0233] As shown in Figure 17, the laser light source array consisting of the first laser light source group 1 and the second laser light source group 2, the dichroic mirror 3, the focusing lens 7, and the fluorescence conversion device 4 are arranged in sequence along a first direction (e.g., the x-direction). The dichroic mirror 3 and the exit lens 51 are arranged in sequence along a second direction (e.g., the y-direction). The first direction intersects the second direction, and in this embodiment, the first direction is perpendicular to the second direction.

[0234] As shown in FIG17 , the light source device 100 further includes a first reflector 11 and a second reflector 12 . The first reflector 11 is located on the light-emitting side of the first laser light source group and is used to reflect the blue laser light emitted by the first laser light source group 1 toward the second portion 322 . The second reflector 12 is located on the light-emitting side of the second laser light source group and is used to reflect the multi-color laser light emitted by the second laser light source group 2 toward the fourth portion 324 .

[0235] The laser beams emitted by the first laser light source group 1 and the second laser light source group 2 can be regarded as a laser spot when they are incident on the corresponding reflector. Therefore, the size of the first reflector 11 and the second reflector 12 needs to be larger than the size of the incident laser spot. By setting the first reflector 11 and the second reflector 12 to a suitable angle, it can be ensured that the blue laser emitted by the first laser light source group 1 is reflected by the first reflector 11 and then incident on the second part 322, and the red laser and green laser emitted by the second laser light source group 2 are reflected by the second reflector 12 and then incident on the fourth part 324.

[0236] Based on this implementation method (1), the fluorescence conversion device 4 can adopt the above-mentioned fluorescence conversion device 4 including a fluorescence wheel and a light selection layer 413 (see Figures 27 and 28), or it can adopt a fluorescence conversion device 4 including a dynamic optical component 421, a fluorescence conversion component 422 and a heat dissipation component 423 (see Figure 17).

[0237] The following only takes the fluorescence conversion device 4 including the dynamic optical component 421, the fluorescence conversion component 422 and the heat dissipation component 423 as an example. The fluorescence conversion layer 4221 of the fluorescence conversion component 422 is used to emit yellow fluorescence under the excitation of blue laser; the transmission part 4212 of the dynamic optical component 421 includes a first filter part 42121 and a second filter part 42122, the first filter part 42121 is used to transmit light in the first and second wavelength bands and reflect light in the third wavelength band; the second filter part 42122 is used to transmit light in the first and third wavelength bands and reflect light in the second wavelength band; the first wavelength band includes the blue wavelength band, the second wavelength band includes the red wavelength band, and the third wavelength band includes the green wavelength band.

[0238] Based on the implementation method (2), one arrangement of the output element 5 is, as shown in Figure 17, the output element 5 is an exit lens 51, the fluorescence of the second band and the laser of the second band are combined and emitted by the exit lens 51, and the fluorescence of the third band and the laser of the third band are combined and emitted by the exit lens 51.

[0239] In conjunction with Figure 17, the working principle of the light source device 100 involved in implementation method (2) is exemplarily explained. In Figure 17, a focusing mirror 7 is arranged between the dichroic mirror 3 and the dynamic optical component 421. Therefore, the focusing mirror 7 will be involved in the following description, which does not rule out the technical solution where the focusing mirror 7 does not exist.

[0240] As shown in FIG17 , when the dynamic optical component 421 is switched so that the reflective portion 4211 faces the fluorescence conversion component 422, the first laser light source group 1 is activated. The blue laser light emitted by the first laser light source group 1 is reflected by the first reflector 11, then incident on the dichroic mirror 3 (specifically, the second portion 322 of the dichroic mirror 3). After being focused by the focusing mirror 7, it is irradiated onto the reflective portion 4211 of the dynamic optical component 421. The blue laser light incident on the reflective portion 4211 is reflected by the dichroic mirror 3 (specifically, the third portion 323 of the dichroic mirror 3), where it is reflected and emitted in the set direction.

[0241] When the dynamic optical component 421 switches to a position where the first filter section 42121 faces the fluorescence conversion component 422, the second laser sources in the first laser source group 1 and the second laser source group 2 are simultaneously activated. The blue laser light emitted by the first laser source group 1 is reflected by the first reflector 11, then enters the second section 322 of the dichroic mirror. After being focused by the focusing lens 7, it is irradiated onto the first filter section 42121 of the dynamic optical component 421. The red laser light emitted by the second laser source group 2 is reflected by the second reflector 12, then enters the fourth section 324 of the dichroic mirror. After being focused by the focusing lens 7, it is irradiated onto the first filter section 42121 of the dynamic optical component 421.

[0242] Blue laser light passes through the first filter 42121 and strikes the fluorescence conversion component 422, exciting it to emit fluorescence (e.g., yellow fluorescence). This fluorescence is reflected by the reflective layer 4223, filtered by the first filter 42121, and then emitted toward the dichroic mirror 3. This red fluorescence is then reflected by the dichroic mirror 3 and emitted in the desired direction. The anti-reflection layer 4222 has an anti-transmittance effect on blue light and a reflective effect on red and green light. The red laser light is reflected by the anti-reflection layer 4222, passes through the first filter 42121, and then exits the dichroic mirror 3. This reflection is then reflected by the dichroic mirror 3 and emitted in the desired direction along with the red fluorescence.

[0243] When the dynamic optical component 421 switches to the position where the second filter section 42122 faces the fluorescence conversion component 422, the third laser source in the first laser source group 1 and the second laser source group 2 are simultaneously activated. The blue laser light emitted by the first laser source group 1 is reflected by the first reflector 11, then enters the second section 322 of the dichroic mirror. After being focused by the focusing lens 7, it is irradiated onto the second filter section 42122 of the dynamic optical component 421. The green laser light emitted by the second laser source group 2 is reflected by the second reflector 12, then enters the fourth section 324 of the dichroic mirror. After being focused by the focusing lens 7, it is irradiated onto the second filter section 42122 of the dynamic optical component 421.

[0244] The blue laser light passes through the second filter 42122 and strikes the fluorescence conversion component 422, exciting the fluorescence conversion component 422 to emit fluorescence (e.g., yellow fluorescence). The fluorescence is reflected by the reflective layer 4223, filtered by the second filter 42122, and then emitted toward the dichroic mirror 3. After being reflected by the dichroic mirror 3, it is emitted in a predetermined direction. The green laser light is reflected by the anti-reflection layer 4222, passes through the second filter 42122, and then emitted toward the dichroic mirror 3. After being reflected by the anti-reflection layer 4222, it is emitted together with the red fluorescence in a predetermined direction.

[0245] FIG24 is a schematic structural diagram of another light source device based on implementation method (2), and FIG24 is based on the light source device 100 shown in FIG17 .

[0246] As shown in FIG24 , the light source device further includes a first collimator 6 positioned between the first laser light source group 1 and / or the second laser light source group 2 and the dichroic mirror 3. The first collimator 6 is used to collimate and shape the laser light emitted by the laser light source group to reduce the laser spot size. The first collimator 6 may include at least one lens. In the embodiment of the present application, the first collimator 6 includes two lenses.

[0247] FIG25 is a schematic structural diagram of another light source device based on implementation method (2), and FIG25 is based on the light source device 100 shown in FIG24 .

[0248] As shown in FIG25 , the light source device 100 further includes a first light homogenizer 9 located between the first collimator 6 and the dichroic mirror 3. The laser light emitted by the laser light source group has high energy. To avoid laser speckle and to prevent excessive laser energy incident on the fluorescence conversion component, which would reduce fluorescence conversion efficiency, the first light homogenizer 9 is provided in the optical path to homogenize the laser light. For example, the first light homogenizer 9 is a light homogenizer layer.

[0249] FIG26 is a schematic structural diagram of another light source device involved in implementation method (2), and FIG26 is based on the light source device 100 shown in FIG25 .

[0250] As shown in Figure 26, the light source device 100 further includes a second light homogenizer 10 located on the side of the exit lens 51 away from the dichroic mirror 3. For example, the second light homogenizer 10 can be a light rod, a light pipe, or the like.

[0251] The three primary color lights outputted sequentially by the dichroic mirror 3 need to be further homogenized before being incident on the display component. Therefore, a second light homogenizer 10 is provided at the light outlet of the light source device 100, and an exit lens 51 is provided before the second light homogenizer 10, so that as much light as possible is incident on the second light homogenizer 10 and utilized.

[0252] In another aspect, embodiments of the present application further provide a projection system, as shown in FIG30 . 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 is configured to modulate incident light before emitting it. The projection lens 300 is located in the light-emitting path of the light valve modulation component 200 and is configured to project the light emitted by the light valve modulation component 200 into an image.

[0253] The light valve modulation component 200 modulates and reflects incident light. In a specific implementation, the light valve modulation component 200 can employ a digital micromirror device (DMD). The DMD's surface comprises thousands of tiny mirrors, each of which can be individually driven to rotate and form a pixel in the projection image. By controlling the DMD's deflection angle, the reflected light is directed to the projection lens 300. As can be seen, based on the image to be displayed, the light valve modulation component 200 causes the mirrors corresponding to the pixels to be illuminated to reflect laser light toward the lens, thereby modulating the light.

[0254] The projection lens 300 may include multiple lenses (not shown). The laser light emitted from the light valve modulation component 200 may sequentially pass through the multiple lenses of the projection lens 300 and be projected onto the screen, thereby enabling the projection lens 300 to project the laser light and display the projection image.

[0255] The projection system provided in the embodiment of the present application has all the advantages of the light source device 100 mentioned above.

[0256] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A light source device, wherein: The light source device (100) comprises: a first laser light source group (1), a second laser light source group (2), a dichroic mirror (3), a fluorescence conversion device (4) and an output device (5); The first laser light source group (1) includes a first laser light source, the first laser light source is used to emit laser light of a first wavelength band, the second laser light source group (2) includes at least a second laser light source and a third laser light source, the second laser light source is used to emit laser light of a second wavelength band, and the third laser light source is used to emit laser light of a third wavelength band; The dichroic mirror (3) is located on the light-emitting side of the first laser light source group (1) and the second laser light source group (2), and the fluorescence conversion device (4) and the emission element (5) are respectively located on the light-emitting side of the dichroic mirror (3); The dichroic mirror (3) is used to emit the laser light of the first wavelength band, the laser light of the second wavelength band, and the laser light of the third wavelength band; the fluorescence conversion device (4) is capable of generating target fluorescence under the excitation of the laser light of the first wavelength band; the target fluorescence is reflected by the dichroic mirror (3) to the emission element (5); and the target fluorescence is capable of providing fluorescence of the second wavelength band and fluorescence of the third wavelength band; The light source device (100) is configured to include at least three light beams, which are emitted by the emission element (5) according to a time sequence. The at least three light beams include: the laser light of the first wavelength band is emitted alone, the laser light of the second wavelength band and the fluorescence light of the second wavelength band are emitted together, and the laser light of the third wavelength band and the fluorescence light of the third wavelength band are emitted together.

2. The light source device according to claim 1, wherein The light source device includes a first light output path, and the first light output path includes: The laser light of the first wavelength band is emitted through the dichroic mirror (3), the fluorescence conversion device (4), the dichroic mirror (3), and the emission element (5); The laser light of the second wavelength band passes through the dichroic mirror (3) and the output element (5), and is combined with the fluorescence light of the second wavelength band at the output element (5) and output; The laser light of the third wavelength band passes through the dichroic mirror (3) and the output element (5), and is combined with the fluorescence light of the third wavelength band at the output element (5) and output.

3. The light source device according to claim 1, wherein The light source device includes a second light exit path, and the second light exit path includes: The laser light of the first wavelength band is emitted through the dichroic mirror (3), the fluorescence conversion device (4), the dichroic mirror (3), and the emission element (5); The laser light of the second wavelength band passes through the dichroic mirror (3), the fluorescence conversion device (4), the dichroic mirror (3), and the output element (5), and is combined with the fluorescence light of the second wavelength band at the output element (5) and output; The laser light of the third wavelength band passes through the dichroic mirror (3), the fluorescence conversion device (4), the dichroic mirror (3), and the output element (5), and is combined with the fluorescence light of the third wavelength band at the output element (5) and output.

4. The light source device according to any one of claims 1 to 2, wherein: The fluorescence conversion device (4) is a fluorescence wheel, and the fluorescence wheel comprises a fluorescence conversion area (411) and a laser emission area (412); The fluorescence conversion region (411) is used to emit the target fluorescence under the excitation of the received laser light of the first wavelength band; The laser emission area (412) is used to receive the laser light in the first waveband and emit the laser light in a transmission mode or a reflection mode.

5. The light source device according to claim 1 or 3, wherein: The fluorescence conversion device (4) comprises a fluorescence wheel and a light selection layer (413), wherein the fluorescence wheel comprises a fluorescence conversion area (411) and a laser emission area (412); The fluorescence conversion zone (411) is used to provide the target fluorescence under the excitation of the received laser light of the first wavelength band; The laser emission area (412) is used to receive the laser light in the first waveband and emit it in a transmission mode or a reflection mode; The light selection layer (413) is located on the surface of the fluorescent wheel facing the dichroic mirror (3), and the light selection layer (413) satisfies the following Conditions: transmit the laser light of the first wavelength band and the target fluorescence, and reflect the laser light of the second wavelength band and the laser light of the third wavelength band.

6. The light source device according to any one of claims 1 to 3, wherein: The fluorescence conversion device (4) comprises a dynamic optical component (421), a fluorescence conversion component (422), and a heat dissipation component (423); The dynamic optical component (421) comprises a reflective portion (4211) and a transmissive portion (4212) capable of dynamic switching, wherein the reflective portion (4211) is used to reflect laser light in a first wavelength band, and the transmissive portion (4212) is used to transmit light. The fluorescence conversion component (422) is located on the light-emitting side of the dynamic optical component (421), and the fluorescence conversion component (422) is used to emit the target fluorescence under the excitation of the received laser light of the first wavelength band; The heat dissipation component (423) is located on a side of the fluorescence conversion component (422) away from the dynamic optical component (421), and the heat dissipation component (423) is used to dissipate heat from the fluorescence conversion component (422).

7. The light source device according to claim 6, wherein: The fluorescence conversion component (422) includes: a fluorescence conversion layer (4221), an anti-reflection layer (4222) and a reflection layer (4223); The fluorescence conversion layer (4221) is used to emit the target fluorescence under the excitation of the laser in the first wavelength band; The anti-reflection layer (4222) is located on a side of the fluorescence conversion layer (4221) facing the dynamic optical component (421), and the anti-reflection layer (4222) meets the following conditions: transmitting laser light of a first wavelength band and target fluorescence, and reflecting laser light of a second wavelength band and laser light of a third wavelength band; The reflective layer (4223) is located on a side of the fluorescence conversion layer (4221) away from the anti-reflection layer (4222), and the reflective layer (4223) is used to reflect the target fluorescence; Furthermore, the anti-reflection layer (4222) is used to increase the transmittance of laser light in the first wavelength band.

8. The light source device according to claim 7, wherein The fluorescence conversion component (422) further includes: a heat conducting layer (4224) and a connecting layer (4225); The heat-conducting layer (4224) is located on a side of the reflective layer (4223) away from the fluorescent conversion layer (4221); The connection layer (4225) is located on the side of the heat-conducting layer (4224) away from the reflective layer (4223), and the connection layer (4225) is used to connect the heat dissipation component (423).

9. The light source device according to claim 7, wherein: The transmission part (4212) includes a first filter part (42121) and a second filter part (42122); The first filter portion (42121) is used to transmit light in the first wavelength band and the second wavelength band and reflect light in the third wavelength band; The second filter portion (42122) is used to transmit light in the first wavelength band and the third wavelength band and reflect light in the second wavelength band; The first wavelength band includes a blue wavelength band, the second wavelength band includes a red wavelength band, and the third wavelength band includes a green wavelength band.

10. The light source device according to claim 1, wherein The output component (5) includes an output lens (51) and a color filter wheel (8); The color filter wheel (8) comprises a first filter area (81), a second filter area (82) and a transmission area (83), and the color filter wheel (8) is configured to rotate so that different areas receive light emitted from the exit lens (51); The first filter area (81) is used to receive the target fluorescence and the laser light of the second wavelength band from the exit lens (51), the first filter area (81) filters the target fluorescence to obtain the fluorescence of the second wavelength band, and the fluorescence of the second wavelength band and the laser light of the second wavelength band are combined and emitted by the first filter area (81); The second filter area (82) is used to receive the target fluorescence and the laser light of the third wavelength band from the exit lens (51), the second filter area (82) filters the target fluorescence to obtain the fluorescence of the third wavelength band, and the fluorescence of the third wavelength band and the laser light of the third wavelength band are combined and emitted by the second filter area (82); The transmission area (83) is used to receive the laser light of the first wavelength band from the exit lens (51).

11. The light source device according to claim 1, wherein The transmittance of at least a portion of the dichroic mirror (3) to light with a wavelength within a target wavelength range is greater than a first probability threshold, and the transmittance to light with a wavelength outside the target wavelength range is less than a second probability threshold, and the first probability threshold is greater than the second probability threshold; The wavelengths in the target wavelength range satisfy: the absolute value of the wavelength difference between the central wavelength of the laser light of the first wavelength band provided by the first laser light source group (1) is less than a wavelength difference threshold, or the absolute value of the wavelength difference between the central wavelength of the laser light of the second wavelength band or the laser light of the third wavelength band provided by the second laser light source group (2) is less than the wavelength difference threshold, wherein the wavelength difference threshold ranges from 3 nanometers to 10 nanometers.

12. The light source device according to claim 11, wherein The light source device (100) comprises a first light output path, and the light source device (100) further comprises: an optical path adjustment lens group (13) and a second collimating lens (14); The second collimating lens (14) is used to collimate the laser light of the first wavelength band from the fluorescence conversion device (4) and then emit it toward the optical path adjustment lens group (13); The optical path adjustment mirror group (13) is used to direct the received laser light of the first wavelength band toward the dichroic mirror (3), and the dichroic mirror (3) is used to transmit the laser light of the first wavelength band received from the optical path adjustment mirror group (13) to the output element (5).

13. The light source device according to claim 11, wherein The light source device (100) comprises a first light exit path, and the dichroic mirror (3) comprises a first area (311) and a second area (312); The first zone (311) is used to receive laser light of a first wavelength band from the first laser light source group (1) and transmit the laser light to the fluorescence conversion device (4); The second zone (312) is used to receive the laser light of the first wavelength band from the first zone (311) and reflect it to the output element (5); The first area (311) and the second area (312) are also used to transmit the laser light of the second wavelength band or the laser light of the third wavelength band from the second laser light source group (2) to the output element (5).

14. The light source device according to claim 12 or 13, wherein: The light source device (100) further comprises at least one of the following components: a first diffuser (16), a second diffuser (17), a beam reducing lens group (18), and a light combining lens group (19); The first diffuser (16) is located between the first laser light source group (1) and the dichroic mirror (3); the laser light of the first wavelength band emitted by the first laser light source group (1) is diffused by the first diffuser (16) and then emitted toward the dichroic mirror (3); The second diffuser (17) is located on the light-emitting side of the second laser light source group (2); the laser light of the second wavelength band or the laser light of the third wavelength band emitted by the second laser light source group (2) is diffused by the second diffuser (17) and then emitted toward the dichroic mirror (3); The beam reduction mirror group (18) is used to reduce the beam of the received laser light of the first wavelength band and then emit it toward the dichroic mirror (3); The light combining mirror group (19) is used to bring the emission positions of the laser light of the second wavelength band and the laser light of the third wavelength band from the second laser light source group (2) closer together.

15. The light source device according to claim 11, wherein The light source device (100) comprises a second light output path; The dichroic mirror (3) comprises a first portion (321), a second portion (322), a third portion (323), and a fourth portion (324) arranged side by side in sequence, the second portion (322) being located on the light output path of the first laser light source group (1), and the fourth portion (324) being located on the light output path of the second laser light source group (2); The second part (322) is used to transmit the laser light of the first wavelength band, the fourth part (324) is used to transmit at least the laser light of the second wavelength band and the laser light of the third wavelength band, and the first part (321) and the third part (323) are used to reflect the laser light of the first wavelength band, the laser light of the second wavelength band or the laser light of the third wavelength band and the fluorescence.

16. The light source device according to claim 15, wherein The fluorescence conversion device (4) comprises a dynamic optical component (421), a fluorescence conversion component (422), and a heat dissipation component (423); The fluorescence conversion layer (4221) of the fluorescence conversion component (422) is used to emit yellow fluorescence under the excitation of the laser light in the first wavelength band; The transmission part (4212) of the dynamic optical component (421) includes a first filter part (42121) and a second filter part (42122). The first filter portion (42121) is used to transmit light in the first and second wavelength bands and reflect light in the third wavelength band; The second filter portion (42122) is used to transmit light in the first wavelength band and the third wavelength band and reflect light in the second wavelength band; The first wavelength band includes a blue wavelength band, the second wavelength band includes a red wavelength band, and the third wavelength band includes a green wavelength band.

17. The light source device according to claim 1, wherein The laser of the first wavelength band is a blue laser, the laser of the second wavelength band is a red laser, and the laser of the third wavelength band is a green laser; The fluorescence in the second wavelength band is red fluorescence, and the fluorescence in the third wavelength band is green fluorescence.

18. The light source device according to claim 17, wherein: The second laser light source group (2) further comprises a fourth laser light source, the fourth laser light source being used to emit blue laser light, the central wavelength of the blue laser light emitted by the fourth laser light source being different from the central wavelength of the blue laser light emitted by the first laser light source.

19. The light source device according to any one of claims 1 to 18, wherein: The light source device (100) further comprises at least one of the following components: a first collimating lens (6), a focusing lens (7), a first light homogenizing element (9), and a second light homogenizing element (10); The first collimating mirror (6) is located between at least one of the first laser light source group (1) and the second laser light source group (2) and the dichroic mirror (3); The focusing mirror (7) is located between the dichroic mirror (3) and the fluorescence conversion device (4); The first light homogenizer (9) is located between at least one of the first laser light source group (1) and the second laser light source group (2) and the dichroic mirror (3), or between the first collimator (6) and the dichroic mirror (3); The second light homogenizing element (10) is located on the light emitting side of the emitting element (5).

20. A projection system, wherein: The projection system comprises: the light source device (100) according to any one of claims 1 to 19, and a light valve modulation component (200) and a projection lens (300); The light valve modulation component (200) is located on the light output side of the light source device (100), and the light valve modulation component (200) is used to modulate the incident light and then output it; The projection lens (300) is located on the outgoing light path of the light valve modulation component (200), and the projection lens (300) is used to project the outgoing light of the light valve modulation component (200) into an image.

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