Light source structure and projection device

Abstract

The application provides a light source structure, which comprises a light source module, a light combination element, a first wavelength conversion element, a first heat dissipation element and an adjustable reflection element. The light source module is used for emitting excitation light. The light combination element comprises a first light inlet surface and a second light inlet surface. The first wavelength conversion element is opposite to the second light inlet surface. The first heat dissipation element is used for dissipating heat of the first wavelength conversion element. The adjustable reflection element comprises adjacent first and second reflection sections. The first reflection section is used for guiding the excitation light emitted by the light source module to the first light inlet surface of the light combination element along a first light path. The second reflection section is used for guiding the excitation light emitted by the light source module to the first wavelength conversion element along a second light path. The light source structure provided by the application separates the adjustable reflection element and the first wavelength conversion element, thereby improving the heat dissipation performance of the first wavelength conversion element. The application further provides a projection device.

Description

Technical Field

[0001] This invention relates to the field of optical technology, and more specifically, to a light source structure and a projection device. Background Technology

[0002] As one of the most important components of lighting and projectors, the light source structure directly affects the overall effect and is therefore of great concern. Laser light sources, as a crucial part of the light source structure, are widely used due to their high brightness, sophisticated design, and long lifespan. During operation under excitation light, the phosphor within the light source structure generates a significant amount of heat due to the jumping of its molecular energy levels. This heat dissipation increases continuously with the increase in excitation light power and continuous operating time. Furthermore, as the temperature rises, the efficiency of the phosphor in generating excitation light decreases, and beyond a certain critical value, the rate of efficiency decline accelerates. The increase in temperature also reduces the lifespan of the light source structure. Summary of the Invention

[0003] The purpose of this invention is to provide a light source structure and projection device to solve the above-mentioned problems. The embodiments of this invention achieve the above objective through the following technical solutions.

[0004] In a first aspect, the present invention provides a light source structure, including a light source module, a light combining element, a first wavelength conversion element, a first heat dissipation element, and an adjustable reflective element. The light source module is used to emit excitation light. The light combining element includes a first light-incident surface and a second light-incident surface. The first wavelength conversion element is opposite to the second light-incident surface. The first heat dissipation element is used to dissipate heat from the first wavelength conversion element. The adjustable reflective element includes an adjacent first reflection segment and a second reflection segment. The first reflection segment is used to guide the excitation light emitted by the light source module along a first optical path to the first light-incident surface of the light combining element, and the second reflection segment is used to guide the excitation light emitted by the light source module along a second optical path to the first wavelength conversion element. The first wavelength conversion element is used to convert the excitation light guided by the second reflection segment into first fluorescence. The first fluorescence is incident on the second light-incident surface, and the light combining element is used to combine the excitation light incident from the first light-incident surface and the first fluorescence incident from the second light-incident surface.

[0005] Secondly, the present invention also provides a projection device, including any of the above-described light source structures.

[0006] Compared with the prior art, the light source structure and projection device provided by the present invention separate the adjustable reflection element and the first wavelength conversion element, and fix the first heat dissipation element to the first wavelength conversion element so as to dissipate heat from the first wavelength conversion element through the first heat dissipation element, thereby improving the heat dissipation performance of the first wavelength conversion element and thus improving the service life of the light source structure.

[0007] These or other aspects of the invention will become more apparent from the following description of the embodiments. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the description of the embodiment will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the light source structure provided in the first embodiment of the present invention;

[0010] Figure 2 This is a schematic diagram of the adjustable reflective element provided in the first embodiment of the present invention;

[0011] Figure 3 This is a schematic diagram of the light source structure provided in one embodiment of the first embodiment of the present invention;

[0012] Figure 4 This is a schematic diagram of the light source structure provided in the second embodiment of the present invention;

[0013] Figure 5 This is a schematic diagram of the light source structure provided in one embodiment of the second embodiment of the present invention;

[0014] Figure 6 This is a schematic diagram of the light source structure provided in the third embodiment of the present invention;

[0015] Figure 7 This is a schematic diagram of the adjustable reflective element provided in the third embodiment of the present invention;

[0016] Figure 8 This is a schematic diagram of the light source structure provided in the fourth embodiment of the present invention;

[0017] Figure 9 This is the optical path diagram of the blue light mode of the light source structure provided in the fourth embodiment of the present invention;

[0018] Figure 10 This is the optical path diagram of the first fluorescence mode of the light source structure provided in the fourth embodiment of the present invention;

[0019] Figure 11 This is the optical path diagram of the second fluorescence mode of the light source structure provided in the fourth embodiment of the present invention;

[0020] Figure 12 This is a schematic diagram of the light source structure provided in the fifth embodiment of the present invention;

[0021] Figure 13This is a schematic diagram of the projection device provided in the sixth embodiment of the present invention. Detailed Implementation

[0022] To facilitate understanding of this embodiment, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this embodiment is for the purpose of describing particular implementations only and is not intended to limit the scope of the invention.

[0024] First Embodiment

[0025] Please see Figure 1 , Figure 2 and Figure 3 This invention provides a light source structure 10, including a light source module 11, a light combining element 12, a first wavelength conversion element 13, a first heat dissipation element 14, and an adjustable reflective element 15. The adjustable reflective element 15 has an adjustable reflection angle, thereby guiding the excitation light emitted from the light source module 11 to different wavelength conversion devices via different optical paths. Under the excitation light emitted from the light source module 11, each wavelength conversion device emits fluorescence of a color corresponding to its own. The different fluorescencees are then combined by the light combining element 12 and emitted from the output optical path. The first heat dissipation element 14 is positioned corresponding to the first wavelength conversion element 13 to dissipate heat from the first wavelength conversion device 13.

[0026] The light source module 11 is used to emit excitation light. In this embodiment, the light source module 11 can be an array of light-emitting elements, specifically a one-dimensional array of light-emitting elements, and the plane containing the one-dimensional array of light-emitting elements is perpendicular to the plane containing each optical path after the excitation light is reflected by the adjustable reflective element 15. The light source module 11 can be a blue light source, and the excitation light can be a blue laser. Since the cost of a blue light source is low, using a blue light source can reduce costs. The blue laser serves as both the primary color light and the excitation light, exciting red and green light, and can also exciting yellow light, which is then combined with the blue laser light.

[0027] The adjustable reflective element 15 is generally shaped like a frustum and can be rotated around its central axis by a motor. As the adjustable reflective element 15 rotates, it can guide the light emitted from the light source along different optical paths to different wavelength conversion devices at different times. All optical paths are within a single plane. The adjustable reflective element 15 includes a reflector and a reflector adjustment mechanism. The reflector adjustment mechanism can adjust the reflection angle of the reflector relative to the light source module 11 at different times based on lighting requirements, thereby guiding the light emitted from the light source to different wavelength conversion devices at different times.

[0028] Specifically, the adjustable reflective element 15 includes adjacent first reflective section 152 and second reflective section 154. The first reflective section 152 guides the excitation light emitted by the light source module 11 along a first optical path to the first light-incident surface 121 of the light combining element 12. The first reflective section 152 has an adjustable first reflection angle A1 for the excitation light emitted by the light source module 11, wherein the first reflection angle A1 can be 45°. The second reflective section 154 guides the excitation light emitted by the light source module 11 along a second optical path to the first wavelength conversion element 13. The second reflective section 154 has an adjustable second reflection angle A2 for the excitation light emitted by the light source module 11, and the second reflection angle A2 can be smaller than the first reflection angle A1.

[0029] The first reflective segment 152 and the second reflective segment 154 can be distributed in an arc or fan shape on the adjustable reflective element 15. The lengths of the first reflective segment 152 and the second reflective segment 154 can be equal, so that the light source structure 10 can emit equal amounts of light of two colors without considering conversion efficiency. In other embodiments, the lengths of the first reflective segment 152 and the second reflective segment 154 can be set according to actual needs.

[0030] In other embodiments, the adjustable reflective element 15 may further include a transition section. When the excitation light emitted from the light source module 11 is incident on the transition section, the excitation light is reflected in other directions and does not incident on the light combining element 12, meaning that the light source structure 10 does not emit light. Depending on the length of the transition section, the time during which the light source structure 10 does not emit light varies. By controlling the length of the transition section, the light emission effect of the light source structure 10 can be controlled. In other words, the transition section of the adjustable reflective element 15 realizes the on / off function of the light source structure 10.

[0031] In this embodiment, the light-combining element 12 is an X-type color-combining filter device, such as a light-combining prism or a dichroic filter. The light-combining element 12 is generally cubic in structure, wherein the light-combining element used for light combining in the light-combining element 12 is generally X-shaped. The light-combining element 12 includes a first light-incident surface 121 and a second light-incident surface 123. The light-combining element 12 is used to combine the excitation light incident from the first light-incident surface 121 and the first fluorescence incident from the second light-incident surface 123.

[0032] In one embodiment, the light combining element 12 further includes a third light-incident surface 125 and a light-exiting surface 127. The first light-incident surface 121 is perpendicularly connected to the second light-incident surface 123 and the third light-incident surface 125, and the third light-incident surface 125 is perpendicularly connected to the first light-incident surface 121 and the light-exiting surface 127. The third light-incident surface 125 is used for the incidence of the second fluorescence. The light-exiting surface 127 is opposite to the first light-incident surface 121 and is used for emitting the mixed light. The light combining element 12 combines the second fluorescence incident from the third light-incident surface 125, the excitation light incident from the first light-incident surface 121, and the first fluorescence incident from the second light-incident surface 123, and emits the combined light from the light-exiting surface 127.

[0033] The light combining element 12 also includes a first selective reflective surface 128 and a second selective reflective surface 129, which intersect perpendicularly. The first selective reflective surface 128 is used to transmit excitation light incident from the first incident surface 121 and reflect first fluorescence incident from the second incident surface 123. The second selective reflective surface 129 is used to transmit excitation light incident from the first incident surface 121 and reflect second fluorescence incident from the third incident surface 125.

[0034] In this embodiment, the first wavelength conversion element 13 is disposed on the side of the first heat dissipation element 14 near the second light-incident surface 123. The first wavelength conversion element 13 is used to convert the excitation light guided by the second reflection segment 154 into first fluorescence, which is then incident on the second light-incident surface 123. The first wavelength conversion element 13 can be a phosphor sheet fixedly connected to the first heat dissipation element 14. Since the first wavelength conversion element 13 does not need to be integrally disposed with the adjustable reflection element 15 and connected to the motor drive, and the first wavelength conversion element is fixedly connected to the first heat dissipation element 14, the heat generated when the excitation light is incident on the first wavelength conversion element 13 can be directly conducted and dissipated, avoiding the continuous decrease in the efficiency of excitation light generation due to excessive temperature of the phosphor sheet. In this embodiment, the first wavelength conversion element 13 is provided with a yellow fluorescent material. The excitation light reflected by the first reflection segment 152 is excited and generates yellow fluorescence after passing through the first wavelength conversion element 13. The yellow fluorescence and the excitation light reflected by the second reflection segment 154 are combined by the light combining element 12 to form white illumination light, which can be used in an illumination system. The first wavelength conversion element 13 can be a color wheel.

[0035] like Figure 3As shown, in some embodiments, the first wavelength conversion element 13 may also be embedded in the first heat dissipation element 14 near the second light-incident surface 123 and exposed on the surface of the first heat dissipation element 14. This arrangement allows the first fluorescence generated by the first wavelength conversion element 13 to be incident on the light combining element 12 as much as possible, preventing the first fluorescence from emitting in all directions and improving the light utilization rate of the light source structure 10. In other embodiments, the first wavelength conversion element 13 is embedded in the first heat dissipation element 14 near the second light-incident surface 123 and exposed on the surface of the first heat dissipation element 14. Furthermore, a reflective layer may be deposited on at least one of the three contact surfaces where the first heat dissipation element 14 contacts the first wavelength conversion element 13. The reflective layer may be a high-reflectivity film, which can improve the light utilization rate of the light source structure 10.

[0036] In this embodiment, the first heat dissipation element 14 is disposed on the side of the first wavelength conversion element 13 away from the second light-incident surface 123, and is used to dissipate heat from the first wavelength conversion element 13. In this embodiment, the first heat dissipation element 14 is fixedly connected to the first wavelength conversion element 13 to facilitate the dissipation of heat generated by the first wavelength conversion element 13 through heat transfer. Specifically, the first heat dissipation element 14 can be a cooling fan or a heat sink. In other embodiments, the first heat dissipation element 14 can also be a color wheel motor, which dissipates heat by driving the color wheel to rotate.

[0037] The light source structure 10 also includes a first shaping lens 18 and a second shaping lens 19. The first shaping lens 18 is located between the adjustable reflective element 15 and the first wavelength conversion element 13, and is used to converge the excitation light reflected by the first reflective segment 152 to the first wavelength conversion element 13. The number of first shaping lenses 18 can be one or more. The first shaping lens 18 can be a convex lens or other lens with a converging function to converge and shape the excitation light reflected by the first reflective segment 152. The second shaping lens 19 is located between the adjustable reflective element 15 and the light combining element 12, and is used to converge the excitation light reflected by the second reflective segment 154 to the second light-incident surface 123.

[0038] In this embodiment, the light source structure 10 further includes a first collecting lens 102, which is located between the first wavelength conversion element 13 and the light combining element 12, and is used to focus the first fluorescence excited by the first wavelength conversion element 13 onto the light combining element 12.

[0039] In this embodiment, the light source structure 10 further includes a scattering sheet 105 and a second collecting lens 106. The excitation light reflected by the second reflecting segment 154 is scattered by the scattering sheet 105 and converged by the second collecting lens 106 before being incident on the light combining element 12. The scattering sheet 105 is used to reduce the speckle of the excitation light. The second collecting lens 106 is used to converge the excitation light emitted from the scattering sheet 105 onto the light combining element 12.

[0040] The light source structure 10 also includes an imaging lens 109, which is opposite to the light-emitting surface 127 of the light combining element 12 and is used to image the mixed light formed by the first fluorescence and the excitation light through the light combining element 12.

[0041] In this embodiment, the light source structure 10 further includes a converging lens 117, which is located between the light source module 11 and the adjustable reflective element 15. The converging lens 117 can be used to focus the excitation light emitted from the light source module 11 onto the adjustable reflective element 15. The number of converging lenses 117 can be the same as the number of lasers.

[0042] In summary, the light source structure 10 provided by the present invention separates the adjustable reflection element 15 and the first wavelength conversion element 13, and fixes the first heat dissipation element 14 to the first wavelength conversion element 13 so as to dissipate heat from the first wavelength conversion element 13 through the first heat dissipation element 14, thereby improving the heat dissipation performance of the first wavelength conversion element 13 and extending the service life of the light source structure 10.

[0043] Second Embodiment

[0044] Please see Figure 4 and Figure 5 Unlike the first embodiment, the light source structure 20 provided in this embodiment further includes a first spatial light modulator 204 and a second spatial light modulator 207. The first spatial light modulator 204 is located between the first collecting lens 202 and the light combining element 22, and is used to modulate the first fluorescence and emit it to the light combining element 22. Specifically, the first spatial light modulator 204 modulates the light beam incident on its surface, outputs an image beam, and finally images it onto the screen through the lens, restoring the image and video for human eye reception. The second spatial light modulator 207 is located between the second collecting lens 206 and the light combining element 22. The second spatial light modulator 207 can be used to modulate the excitation light emitted from the second collecting lens 206 and incident it onto the first light-incident surface 221.

[0045] In one embodiment, the light source structure 20 further includes a first color correction filter 203 and a second color correction filter 208. The first color correction filter 203 is located between the first collecting lens 202 and the first spatial light modulator 204, and is used to correct the first fluorescence emitted from the first collecting lens 202. The second color correction filter 208 is located between the second collecting lens 206 and the second spatial light modulator 207, and is used to correct the color of the excitation light.

[0046] In summary, the light source structure 20 of this embodiment modulates the light beam incident on its surface through the first spatial light modulator 204 and the second spatial light modulator 207 respectively, and outputs an image beam, which is finally imaged onto the screen through the lens, thus realizing the restoration of video and image.

[0047] Third Embodiment

[0048] Please see Figure 6 and Figure 7 Unlike the first embodiment, the optical structure 30 provided in this embodiment includes a second wavelength conversion element 36, and the adjustable reflection element 35 further includes a third reflection segment 356. The second wavelength conversion element 36 is used to convert the excitation light guided by the third reflection segment 356 into a second fluorescence, which is incident on the third incident surface 325. In this embodiment, both the first wavelength conversion element 33 and the second wavelength conversion element 36 are color wheels. The color wheel can be driven by a motor to rotate around its central axis. Through the continuous rotation of the color wheel, the working position of the fluorescent material on the color wheel can be continuously changed.

[0049] In this embodiment, the first reflection segment 352, the second reflection segment 354, and the third reflection segment 356 are connected end to end. The third reflection segment 356 has an adjustable third reflection angle A3 for the excitation light emitted by the light source module 31, and the third reflection angle A3 can be greater than the first reflection angle A1. In other embodiments, the three reflection angles can also have other relationships, as long as they are not equal to each other.

[0050] The first reflective segment 352, the second reflective segment 354, and the third reflective segment 356 can be arranged in an arc or fan shape on the adjustable reflective element 35. The lengths of the first reflective segment 352, the second reflective segment 354, and the third reflective segment 356 can be equal, allowing the light source structure 30 to emit equal amounts of light of three colors without considering conversion efficiency. In other embodiments, the lengths of the first reflective segment 352, the second reflective segment 354, and the third reflective segment 356 can be set according to actual needs.

[0051] The optical structure 30 provided in this embodiment can dissipate heat through the rotating color wheel, which can also improve the service life of the light source structure 30.

[0052] Fourth embodiment

[0053] Please see Figure 8 Unlike the first embodiment, the light source structure 40 provided in this embodiment further includes a second wavelength conversion element 46 and a second heat dissipation element 47. The second wavelength conversion element 46 is located between the third light-incident surface 425 and the second heat dissipation element 47. The second wavelength conversion element 46 is used to convert the excitation light guided by the tunable reflective element 45 into a second fluorescence, which is incident on the third light-incident surface 425. In this embodiment, the second wavelength conversion element 46 is provided with a red fluorescent material. The second heat dissipation element 47 is disposed on the side of the second wavelength conversion element 46 away from the third light-incident surface 425, and is used to dissipate heat from the second wavelength conversion element 46. The structure of the second heat dissipation element 47 can be the same as that of the first heat dissipation element 44, or it can be a cooling fan or a heat sink. By providing a corresponding heat dissipation element for each wavelength conversion device, the heat dissipation efficiency of each wavelength conversion device is improved, thus improving the overall heat dissipation efficiency of the light source structure 40.

[0054] The first wavelength conversion element 43 is provided with a green fluorescent material. In other embodiments, the first wavelength conversion element 43 may also be provided with fluorescent materials of other colors, such as red, green or other colors, which can be adjusted according to actual needs.

[0055] In this embodiment, the light source structure 40 further includes a third collecting lens 410, a third shaping lens 401, a third color-correcting plate 414, and a third spatial light modulator 416. The blue laser reflected by the adjustable reflective element 45 sequentially passes through the second wavelength conversion element 46 to excite second fluorescence, is focused by the third collecting lens 410, corrected by the third color-correcting plate 414, and modulated by the third spatial light modulator 416 before being incident on the light combining device 42. The third shaping lens 401 is located between the adjustable reflective element 45 and the second wavelength conversion element 46, and is used to focus the blue laser reflected by the adjustable reflective element 45 onto the second wavelength conversion element 46. The third collecting lens 410 is located between the second wavelength conversion element 46 and the third color-correcting plate 414, and is used to focus the second fluorescence emitted from the second wavelength conversion element 46 onto the third color-correcting plate 414. The third color-correcting plate 414 is located between the third collecting lens 410 and the third spatial light modulator 416, and is used to correct the color of the second fluorescence emitted from the third collecting lens 410. The third spatial light modulator 416 can be used to modulate the second fluorescence emitted from the third color correction film 414 and incident it onto the third incident light surface 425.

[0056] like Figure 9As shown, in the optical path where the adjustable reflective element 45 has an adjustable first reflection angle A1 for the excitation light emitted by the light source module 41, the excitation light emitted by the light source module 41, after being reflected by the first reflective section 452, is scattered by the diffuser 405 and converged by the second collecting lens 406 before entering the first incident surface 421, and finally enters the imaging lens 409. Figure 9 The optical path diagram shown corresponds to the blue light operating mode of the light source structure 40.

[0057] like Figure 10 As shown, in the optical path where the adjustable reflective element 45 has an adjustable second reflection angle A2 for the excitation light emitted by the light source module 41, the excitation light emitted by the light source module 41 is reflected by the second reflective section 454, then incident on the first wavelength conversion element 43 and converted into first fluorescence. The first fluorescence is then focused by the first collecting lens 402 and incident on the second incident surface 423, and finally incident on the imaging lens 409. Figure 10 The optical path diagram shown corresponds to the first fluorescence operating mode of the light source structure 40.

[0058] like Figure 11 As shown, in the optical path where the adjustable reflective element 45 has an adjustable third reflection angle A3 for the excitation light emitted by the light source module 41, the excitation light emitted by the light source module 41 is reflected by the third reflection section 456, then incident on the second wavelength conversion element 46 and converted into second fluorescence. The second fluorescence is then focused by the third collecting lens 410 and incident on the third incident surface 425, and finally incident on the imaging lens 409. Figure 11 The optical path diagram shown corresponds to the second fluorescence operating mode of the light source structure 40.

[0059] Fifth Embodiment

[0060] Please see Figure 12 Unlike the first embodiment, the light combining element 52 of the light source structure 50 provided in this embodiment is different. The light combining element 52 includes a first dichroic filter 521 and a second dichroic filter 523 arranged opposite to each other. The first light-incident surface 524 and the second light-incident surface 525 are respectively located on opposite sides of the first dichroic filter 521. The first dichroic filter 521 is located between the adjustable reflective element 55 and the second dichroic filter 523, and is used to transmit excitation light and reflect the first fluorescence. In this embodiment, the first dichroic filter 521 can be a blue-transmitting and green-reflecting dichroic filter. The third light-incident surface 526 is located on the side of the second dichroic filter 523 away from the first dichroic filter 521. The second dichroic filter 523 is located between the first dichroic filter 521 and the imaging lens 509, and is used to transmit the first fluorescence reflected by the first dichroic filter 521 and the excitation light transmitted by the first dichroic filter 521, and also to reflect the second fluorescence to the imaging lens 509. In this embodiment, the second dichroic filter 523 can be a cyan-transparent red-transparent dichroic filter.

[0061] Sixth Embodiment

[0062] Please see Figure 13 The present invention also provides a projection device 1, including a light source structure 10 and a housing 80, wherein the light source structure 10 is installed inside the housing 80, and the housing 80 can protect the light source structure 10. The projection device 1 may also include components such as a lens, wherein the lens and other components can refer to the prior art and will not be described here.

[0063] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A light source structure, characterized in that, include: The light source module is used to emit excitation light; A light combining element, comprising a first light-incident surface and a second light-incident surface; The first wavelength conversion element is opposite to the second light incident surface; A first heat dissipation element is used to dissipate heat from the first wavelength conversion element; and An adjustable reflective element includes adjacent first and second reflective sections. The first reflective section guides the excitation light emitted by the light source module along a first optical path to a first light-incident surface of the light-combining element. The second reflective section guides the excitation light emitted by the light source module along a second optical path to a first wavelength conversion element. The first wavelength conversion element converts the excitation light guided by the second reflective section into first fluorescence. The first fluorescence is incident on the second light-incident surface. The light-combining element combines the excitation light incident from the first light-incident surface and the first fluorescence incident from the second light-incident surface. The adjustable reflective element further includes a transition section, which is used to reflect the excitation light emitted from the light source module and prevent the excitation light emitted from the light source module from incident on the light combining element.

2. The light source structure according to claim 1, characterized in that, The light source structure further includes a second wavelength conversion element and a second heat dissipation element. The light combining element further includes a third light incident surface. The second wavelength conversion element is located between the third light incident surface and the second heat dissipation element. The adjustable reflective element further includes a third reflective section. The first reflective section, the second reflective section, and the third reflective section are connected end to end. The second wavelength conversion element is used to convert the excitation light guided by the third reflective section into a second fluorescence. The second fluorescence is incident on the third light incident surface. The light combining element combines the second fluorescence incident from the third light incident surface, the excitation light incident from the first light incident surface, and the first fluorescence incident from the second light incident surface. The second heat dissipation element is disposed on the side of the second wavelength conversion element away from the third light incident surface and is used to dissipate heat from the second wavelength conversion element.

3. The light source structure according to claim 2, characterized in that, The first reflective segment has a first reflection angle for the excitation light emitted by the light source module, the second reflective segment has a second reflection angle for the excitation light emitted by the light source module, and the third reflective segment has a third reflection angle for the excitation light emitted by the light source module. The first reflection angle is greater than the second reflection angle and less than the third reflection angle.

4. The light source structure according to claim 1, characterized in that, The first wavelength conversion element is disposed on the side of the first heat dissipation element close to the second light incident surface.

5. The light source structure according to claim 1, characterized in that, The light combining element further includes a third light-incident surface, a first selective reflective surface, a second selective reflective surface, and a light-emitting surface. The first selective reflective surface and the second selective reflective surface intersect perpendicularly, and the light-emitting surface is opposite to the first light-incident surface. The first light-incident surface is perpendicularly connected to the second light-incident surface and the third light-incident surface. The first selective reflective surface is used to transmit excitation light incident from the first light-incident surface and reflect first fluorescence incident from the second light-incident surface. The second selective reflective surface is used to transmit excitation light incident from the first light-incident surface and reflect second fluorescence incident from the third light-incident surface.

6. The light source structure according to claim 1, characterized in that, The light combining element includes a first dichroic filter and a second dichroic filter arranged perpendicularly to the first dichroic filter. The first light-incident surface and the second light-incident surface are respectively located on opposite sides of the first dichroic filter. The first dichroic filter is located between the adjustable reflective element and the second dichroic filter and is used to transmit the excitation light and reflect the first fluorescence. The light combining element also includes a third light-incident surface, which is located on the side of the second dichroic filter away from the first dichroic filter. The second dichroic filter is used to transmit the first fluorescence reflected by the first dichroic filter and the excitation light transmitted by the first dichroic filter.

7. The light source structure according to claim 1, characterized in that, The light source structure further includes a first shaping lens and a second shaping lens. The first shaping lens is located between the adjustable reflective element and the first wavelength conversion element, and is used to converge the excitation light reflected by the first reflective segment to the first wavelength conversion element. The second shaping lens is located between the adjustable reflective element and the light combining element, and is used to converge the excitation light reflected by the second reflective segment to the second incident light surface.

8. The light source structure according to claim 1, characterized in that, The light source structure further includes a first collecting lens and a first spatial light modulator. The first collecting lens is located between the first wavelength conversion element and the first spatial light modulator and is used to focus the first fluorescence excited by the first wavelength conversion element to the first spatial light modulator. The first spatial light modulator is located between the first collecting lens and the light combining element and is used to modulate the first fluorescence and emit it to the light combining element.

9. The light source structure according to claim 8, characterized in that, The light source structure also includes a first color correction filter, which is located between the first collecting lens and the first spatial light modulator, and is used to correct the first fluorescence emitted by the first collecting lens.

10. The light source structure according to claim 9, characterized in that, The light source structure further includes a scattering sheet, a second collecting lens, a second spatial light modulator, and a second color modulator. The excitation light reflected by the second reflecting section is successively scattered by the scattering sheet, converged by the second collecting lens, corrected by the second color modulator, and modulated by the second spatial light modulator before being incident on the light combining element.

11. The light source structure according to claim 1, characterized in that, The first wavelength conversion element is a color wheel, and the first heat dissipation element is a color wheel motor. The color wheel motor dissipates heat by driving the color wheel to rotate.

12. A projection device, characterized in that, Includes the light source structure as described in any one of claims 1-11.

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