Light source system and projection system

Abstract

The utility model belongs to the technical field of laser light source, disclose a light source system, utilize the wavelength conversion element of dynamic motion, and with wavelength conversion element movement or fixed setting's polarization conversion element, in the direct beating structure effectively improve the light -combining efficiency, simplify the light path to effectively reduce the volume of light source system. The utility model discloses a projection system with the light source system.

Description

Technical Field

[0001] This utility model belongs to the field of laser light source technology, and in particular relates to a light source system and a projection system. Background Technology

[0002] In the field of monochromatic laser source technology, efficient combining of blue light and fluorescence has always been a technical challenge. Existing technologies mainly achieve this by employing two main approaches, both of which have significant limitations. One approach involves an oblique incident mirror structure. This method involves obliquely incident blue light onto a phosphor wheel and using a mirror to separate the excitation light and fluorescence. This requires precise coordination of multiple optical components, resulting in high optical path complexity, significant energy loss, and reduced system efficiency. The second approach involves a blue light loop around a phosphor wheel structure. While this design simplifies optical path alignment, it requires extending the optical channel to adjust the blue light divergence angle, leading to an increased system size. Utility Model Content

[0003] To address the aforementioned technical problems, this invention discloses a light source system that utilizes an excitation light-wavelength conversion element to solve the problem of combining excitation light and radiative fluorescence. This invention also discloses a projection system incorporating the aforementioned light source system.

[0004] The specific technical solution of this utility model is as follows:

[0005] A light source system includes a first light source, a light splitting and combining element, a lens group, a wavelength conversion element, a polarization conversion element, and a light homogenizing element.

[0006] The wavelength conversion element includes a non-fluorescent region and a fluorescent region, and the wavelength conversion element moves dynamically to sequentially switch the non-fluorescent region and the fluorescent region to the emission path of the light emitted by the first light source.

[0007] The light-splitting and light-combining element transmits light of the first polarization state and reflects light of the third polarization state and radiates fluorescence.

[0008] The first light source emits light of a first polarization state along a first direction. The light of the first polarization state passes through a beam splitter and beam combiner and is incident on a lens group to converge and irradiate a wavelength conversion element. The light of the first polarization state irradiates a fluorescent region, and the fluorescent region absorbs the light of the first polarization state to excite and generate radiative fluorescence.

[0009] It also includes a reflective surface. The non-fluorescent region of the wavelength conversion element and the polarization conversion element are located between the light splitting and combining element and the reflective surface. In the optical path of the light in the first polarization state incident on the reflective surface, the polarization conversion element converts the light in the first polarization state into light in the second polarization state. The light in the second polarization state is reflected by the reflective surface and re-intruded into the polarization conversion element and converted into light in the third polarization state.

[0010] The combined light formed by the radiative fluorescence and the third polarized state is emitted in the opposite direction along the first direction;

[0011] The light-splitting and light-combining element reflects the combined light and emits it along the second direction to the light-uniforming element one;

[0012] It also includes a second light source, the light emitted by the second light source being a different color than the light emitted by the first light source;

[0013] The light-splitting and light-combining element also transmits light emitted from the second light source;

[0014] The second light source emits light incident on the beam splitter and combiner along the second direction, and the light emitted by the second light source passes through the beam splitter and combiner and exits in the same direction as the combined light.

[0015] Wherein, the first direction is perpendicular to the second direction.

[0016] This application utilizes the light emitted from the first light source to directly strike the wavelength conversion unit, and coats the light splitting and combining elements to transmit light of the first polarization state and reflect light of the third polarization state and radiate fluorescence, thereby improving the light combining efficiency, simplifying the optical path, and effectively reducing the size of the light source system in the direct striking structure; the light emitted from the second light source can improve the color performance of the final output light.

[0017] Preferably, the reflective surface is configured as the reflective surface of a mirror disposed on the light-emitting side of the non-fluorescent region, or as a reflective surface formed by depositing a reflective film in the non-fluorescent region, or as a polished surface of a metal substrate in the non-fluorescent region.

[0018] This structure can effectively convert light from the first polarization state to the second polarization state, and then convert the second polarization state to the third polarization state.

[0019] Preferably, the polarization conversion element and the reflector are attached to the non-fluorescent region of the wavelength conversion element so as to follow the dynamic movement of the wavelength conversion element;

[0020] Alternatively, the polarization conversion element and the reflector are separated from the wavelength conversion element and are in a fixed position.

[0021] This structure can effectively convert the polarization state of light emitted from the first light source. By using beam splitting and combining elements, the beam is guided out along different preset paths according to its different polarization states, thereby meeting the beam combining requirements.

[0022] Preferably, the polarization conversion element is attached in segments to the non-fluorescent region of the wavelength conversion element.

[0023] When the light emitted by the first light source is not perpendicularly incident on the polarization conversion element, the actual phase delay of the wavelength conversion element will change with the incident angle. In a segmented wavelength conversion element, a wider range of incident angles can be covered, thereby reducing the phase error caused by angle changes and improving the uniformity and overall efficiency of polarization conversion.

[0024] Preferably, the polarization conversion element is attached to the light-incident side of the wavelength conversion element, and the reflector is attached to the light-outceasing side of the wavelength conversion element;

[0025] Alternatively, the polarization conversion element is attached to the light-emitting side of the wavelength conversion element, and the reflector is attached to the light-emitting side of the polarization conversion element.

[0026] The reflector is located on the back side of the polarization conversion element. The light first passes through the fluorescence separation region and then hits the reflector. After being reflected by the reflector, it passes through the polarization conversion element again. Therefore, in this structure, only the light emitted by the first light source passes through the non-fluorescent region, so that the fluorescence excited by the fluorescent region will not pass through the polarization conversion element again, thus ensuring the light combining efficiency.

[0027] Preferably, the reflecting surface of the mirror is located in the focal region of the lens group one, and is parallel or approximately parallel to the surface of the wavelength conversion element, or is curved or arc-shaped relative to the surface of the wavelength conversion element.

[0028] This structure can significantly improve the collimation effect.

[0029] Preferably, a movable homogenizing element two is provided between the wavelength conversion element and the polarization conversion element so that the light spot formed on the wavelength conversion element matches the end face shape of the homogenizing element one.

[0030] The second light-diffusing element can uniformly disperse the light beam and allow it to be incident on the polarization conversion element. After the polarization state of the light beam is converted, it can also converge the light beam and allow it to pass through the wavelength conversion element again, thereby effectively improving the polarization conversion efficiency and light combining efficiency. Since the second light-diffusing element is movable, the shape of the light spot incident on the first light-diffusing element can also be changed by switching the relative angle of the second light-diffusing element in the light source system, thereby better enabling the first light-diffusing element to fully diffract the light beam and emit it. In this way, there is no need to deflect the first light source at an angle, effectively maintaining the volume advantage.

[0031] Preferably, the wavelength conversion element includes at least one fluorescent region, and the magnitude of the current supplied to the first power source is adjustable so that when the first light source illuminates the fluorescent region and the non-fluorescent region, the brightness of the radiant fluorescence and / or the light of the third polarization state is adjusted.

[0032] This application adjusts the brightness of different colors of light by adjusting the current magnitude, thereby compensating for the brightness loss between excitation light and radiative fluorescence, thus flexibly adjusting the white balance and improving brightness while ensuring a certain white balance.

[0033] Preferably, there are multiple first light sources, and the multiple first light sources emit light from a first direction and / or a second direction, which is guided to the first direction by the deflection component.

[0034] Multiple positional relationships between the first and / or second light sources can increase the angular diversity of the optical path, which is beneficial to improving the uniformity of light.

[0035] Preferably, the wavelength conversion element is a quarter-wave plate or a rotator plate.

[0036] Preferably, the light-diffusing element one has an assembly of a color wheel and a diffusion wheel on its light-incident side.

[0037] The combination of the color wheel and the diffusion wheel can purify the radiation fluorescence and homogenize the light in the third polarization state and / or the light emitted by the second light source.

[0038] A projection system, comprising the light source system described above.

[0039] Preferably, the light emitted by the light source system is projected out of the projection system through a lens with a DLP architecture.

[0040] Compared with the prior art, this utility model uses light emitted from the first light source to strike the wavelength conversion element directly, avoiding the problems of low light combining efficiency and complex optical path caused by oblique striking, and avoiding the defects of high energy loss and large overall size. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of one technical solution in an embodiment of the present utility model;

[0042] Figure 2 This is a schematic diagram of another technical solution in an embodiment of the present utility model;

[0043] Figure 3 This is a schematic diagram of another technical solution in an embodiment of the present utility model;

[0044] Figure 4 This is a schematic diagram of another technical solution in an embodiment of the present utility model;

[0045] Figure 5 This is a schematic diagram of one arrangement of the first light source in an embodiment of this utility model;

[0046] Figure 6 This is a schematic diagram of another arrangement of the first light source in an embodiment of this utility model;

[0047] Figure 7 This is a schematic diagram of the wavelength conversion element in an embodiment of the present invention.

[0048] In the diagram: 1-Light splitter / combiner; 2-Lens group one; 3-Wavelength conversion element; 4-Polarization conversion element; 5-Mirror; 6-Light homogenizer one; 7-Non-fluorescent region; 8-Fluorescent region; 9-Light homogenizer two; 10-Light source one; 11-Light source two; 12-Mirror one; 13-Mirror two; 14-Mirror three; 15-Lens; 16-Second light source; 17-Diffuser element; 18-Color wheel; 19-Diffuser wheel; 20-Lens group two; 21-Reflective film. Detailed Implementation

[0049] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to specific embodiments.

[0050] This embodiment applies to a projection system, which includes a light source system, such as... Figures 1-4 As shown, a light source system includes a first light source, a light-splitting and combining element 1, a lens group 2, a wavelength conversion element 3, a polarization conversion element 4, and a light-uniforming element 6. The wavelength conversion element 3 includes a non-fluorescent region 7 and a fluorescent region 8. The wavelength conversion element 3 dynamically moves to sequentially switch the non-fluorescent region 7 and the fluorescent region 8 to the emission path of the light emitted by the first light source. The light-splitting and combining element 1 transmits light of a first polarization state, reflects light of a third polarization state, and radiates fluorescence. The first light source emits light of the first polarization state along a first direction. The light of the first polarization state passes through the light-splitting and combining element 1 and is focused by the lens group 2 to illuminate the wavelength conversion element 3. The light of the first polarization state illuminates the fluorescent region 8. The fluorescent region 8 absorbs light of the first polarization state to generate radiative fluorescence; it also includes a reflective surface, and the non-fluorescent region 7 of the wavelength conversion element 3 and the polarization conversion element 4 are located between the light splitting and combining element 1 and the reflective surface. In the optical path of the light of the first polarization state incident on the reflective surface, the polarization conversion element 4 converts the light of the first polarization state into light of the second polarization state. The light of the second polarization state is reflected by the reflective surface and re-incidentally incident on the polarization conversion element 4 to be converted into light of the third polarization state. The radiative fluorescence and the light of the third polarization state form a combined light that is emitted in the opposite direction along the first direction. The light splitting and combining element 1 reflects the combined light and emits it along the second direction to the light homogenizing element 6; wherein, the first direction is perpendicular to the second direction.

[0051] In this embodiment, the wavelength conversion element 3 is a phosphor wheel. The polarization conversion element 4 is a quarter-wave plate or a rotator plate. For ease of explanation, the first light source emits blue laser light of the first polarization state (P-state blue light), which irradiates the fluorescent region 8 of the wavelength conversion element 3 to excite fluorescence. The light of the first polarization state emitted by the first light source is emitted along the first direction, passes through the beam-shrinking element to reduce the light spot, and is then transmitted through the beam-splitting and combining element 1, and then irradiates the non-fluorescent region 7 or the fluorescent region 8 of the wavelength conversion element 3. The rotation axis of the wavelength conversion element 3 is parallel to and not collinear with the first direction. In this embodiment, the reflecting surface is configured as the reflecting surface of the mirror 5 disposed on the light-emitting side of the non-fluorescent region 7. The non-fluorescent region 7 of the wavelength conversion element 3 is a transparent region, and the light beam can pass through the non-fluorescent region 7. Figure 1 and Figure 3 As shown, the polarization conversion element 4 and the reflector 5 are attached to the non-fluorescent region 7 of the wavelength conversion element 3 to follow the dynamic movement of the wavelength conversion element 3. Specifically, the polarization conversion element 4 is located on the light-incident side of the non-fluorescent region 7, and the reflector 5 is located on the light-outceasing side of the non-fluorescent region 7. Alternatively, both the polarization conversion element 4 and the reflector 5 can be located on the light-outceasing side of the non-fluorescent region 7. When the light beam passes before or after passing the non-fluorescent region 7, the light of the first polarization state is converted into the light of the second polarization state by the polarization conversion element 4, and then reflected by the reflector 5 and converted into the light of the third polarization state (S-state blue light) by the polarization conversion element 4 again. At this time, the emission direction of the third polarization state light is the opposite of the first direction. When the polarization conversion element 4 rotates and the light beam's emission path passes through the fluorescent region 8, the fluorescent region... 8. Excitation of radiative fluorescence, which is emitted in the opposite direction along the first direction. The third polarized light and the radiative fluorescence also pass through lens group 2. Lens group 2 focuses the first polarized light emitted by the first light source to illuminate wavelength conversion element 3. The radiative fluorescence and the third polarized light can also be shaped into collimated light by lens group 2 and then emitted to beam splitting and combining element 1. In this embodiment, only the light emitted by the first light source passes through a 1 / 4 wave plate, which effectively solves the problem of beam combining of excitation light and radiative fluorescence in the direct-light scheme. It can be seen that in this technical solution, the first polarized light can enter the non-fluorescent region 7 and then enter the polarization conversion element 4 to be converted into the second polarized light, or it can enter the polarization conversion element 4 first to be converted into the second polarized light, and then the second polarized light enters the non-fluorescent region 7. Therefore, in a feasible technical solution of this embodiment, the polarization conversion element 4 is attached to the light-incident side of the wavelength conversion element 3, and the reflector 5 is attached to the light-outceasing side of the wavelength conversion element 3; or, the polarization conversion element 4 is attached to the light-outceasing side of the wavelength conversion element 3, and the reflector 5 is attached to the light-outceasing side of the polarization conversion element 4. Further, as... Figure 7As shown, the polarization conversion element 4 is segmented and attached to the non-fluorescent region 7 of the wavelength conversion element 3. In this embodiment, the segmented quarter-wave plate can effectively cover a wider range of incident angles. When the beam irradiates both sides of the quarter-wave plate, due to the arc shape and large angle of the quarter-wave plate, the beam and the quarter-wave plate are incident at different angles. Therefore, segmenting the quarter-wave plate significantly improves the polarization conversion efficiency by optimizing the local phase delay, thereby dispersing and locally correcting the overall error, thus achieving polarization control closer to the ideal state. In other words, segmenting the quarter-wave plate on the wavelength conversion element 3 is beneficial to improving the conversion efficiency of the wave plate. To improve the collimation effect, in this embodiment, the reflecting surface of the mirror 5 is located in the focal region of the lens group 2, and is parallel or approximately parallel to the surface of the wavelength conversion element 3, or is curved or arc-shaped relative to the surface of the wavelength conversion element 3. It should be noted that the difference between a curved surface and an arc-shaped surface lies in whether it has symmetry. As a preferred option, the mirror 5 can be a bowl-shaped structure.

[0052] like Figure 2 As shown, compared with the above technical solution, in another technical solution of this embodiment, the polarization conversion element 4 and the reflector 5 are separated from the wavelength conversion element 3 and their positions are fixed. In this technical solution, a lens 15 is provided between the wavelength conversion element 3 and the polarization conversion element 4 to diffuse the light of the first polarization state and concentrate the light of the third polarization state, so that the beam can be effectively converted in polarization state and pass through the non-fluorescent region 7 of the wavelength conversion element 3 with high efficiency. In specific use, the light of the first polarization state passes through the non-fluorescent region 7 and enters the lens 15, diffuses the light and irradiates the polarization conversion element 4 to be converted into light of the second polarization state. Then, the light of the second polarization state is reflected by the reflector 5 and re-enters the polarization conversion element 4 to be converted into light of the third polarization state. The light of the third polarization state is concentrated by the lens 15 and exits from the non-fluorescent region 7.

[0053] In another technical solution of this embodiment, such as Figure 4 As shown, the reflective surface is configured as a reflective surface formed by depositing a reflective film 21 on the non-fluorescent region 7. Specifically, the non-fluorescent region 7 is actually a reflective region. A diffusion layer and a reflective substrate are sequentially arranged in the direction from the incident light side to the emitting light side of the non-fluorescent region 7. The reflective film 21 is deposited on the reflective substrate. Therefore, light of the second polarization state can be diffused and reflected in the non-fluorescent region 7 and re-injected into the polarization conversion element 4 to be converted into light of the third polarization state. Furthermore, some non-fluorescent regions 7 use a metal substrate to directly reflect the light beam. Therefore, in some technical solutions, the reflective surface can also be configured as a polished surface of the metal substrate in the non-fluorescent region 7.

[0054] In this embodiment, a movable homogenizing element 2 9 is provided on the light emission path of the first light source to match the shape of the light spot formed on the wavelength conversion element 3 with the end face shape of the homogenizing element 6. The homogenizing element 2 9 is a single-sided compound eye. Compared with a diffuser, a single-sided compound eye can shape the light spot on the wavelength conversion element 3 into a rectangle, which can effectively reduce the power density on the wavelength conversion element 3 within the same area. At the same time, the projection system also includes a digital micromirror element, and the illumination light emitted by the light source system illuminates the digital micromirror element to emit image light. The light source system emits image light to the digital micromirror element through the light-diffusing element 6. In this embodiment, the light-diffusing element 6 is a light bar. Therefore, based on the need for the light-diffusing element 6 and the digital micromirror element to match, the light-diffusing element 6 has the ability to rotate along its axis. At this time, the light spot on the wavelength conversion element 3 also needs to be matched with it. Thus, by rotating the single-sided compound eye, the light spot on the wavelength conversion element 3 can be rotated, so there is no need to rotate and adjust the light emission angle of the first light source, which is beneficial for the overall miniaturization. Specifically, the light-incident end face of the light bar is rectangular. Therefore, in order to match the area of ​​the digital micromirror element during the rotation, the light-diffusing element 9 is rotated synchronously in this embodiment, so that when the light hits the wavelength conversion element 3, the light spot is also a rectangle in a rotating state, thereby maintaining the matching with the digital micromirror element.

[0055] like Figure 7 As shown, in this embodiment, the wavelength conversion element 3 includes at least one fluorescent region 8. The current supplied to the first power source is adjustable to adjust the brightness of the radiated fluorescence and / or the third polarization state light when the first light source irradiates the fluorescent region 8 and the non-fluorescent region 7. When the light beam irradiates different fluorescent regions 8, different colors of fluorescent regions 8 are radiated. For ease of explanation, this embodiment has two fluorescent regions 8, radiating green fluorescence and red fluorescence respectively. In one case, the white light output by the light source system is actually detected to be greenish. Therefore, when the light emitted by the first light source irradiates the fluorescent region 8 radiating green fluorescence, the current can be reduced to avoid the green fluorescence being too bright due to excessive phosphor efficiency. Based on the retest results, the current when the light emitted by the first light source irradiates the fluorescent region 8 radiating red fluorescence is maintained or changed, and the current when the light emitted by the first light source passes through the non-fluorescent region 7 is maintained or changed, thereby maintaining white balance and preventing the white light output by the light source system from being greenish.

[0056] In this embodiment, there are multiple first light sources, which emit light from a first direction and / or a second direction, and are guided to the first direction by a deflection component. There are two first light sources, designated as light source one 10 and light source two 11. In one technical solution, such as... Figure 1As shown, the folding assembly includes a first mirror 12, a second mirror 13, and a third mirror 14. A first light source 10 and a second light source 11 are arranged opposite each other, one emitting light along a first direction and the other emitting light in the opposite direction. Mirror 12 reflects the light emitted by the first light source 10, and mirror 13 reflects the light emitted by the second light source 11, causing the light emitted by the first light source 10 and the light emitted by the second light source 11 to be emitted in the same direction along a second direction. Mirror 14 guides the light emitted by the first light source 10 and the second light source 11, which are emitted in the same direction, to the first direction. In one technical solution, as... Figure 5 As shown, light source 10 and light source 2 11 are arranged side by side, emitting light in the first direction or the opposite direction of the first direction. Similarly, the light is guided to the first direction by the folding component. In other technical solutions, such as... Figure 6 As shown, light source 10 and light source 2 11 are arranged at an angle of 90°. Light source 10 emits light along a first direction or the opposite direction, while light source 2 11 emits light along a second direction. The deflection assembly includes mirror 12 and mirror 3 14. Mirror 12 reflects and guides the light emitted by light source 10 to the second direction, and mirror 3 14 then guides the combined light emitted by light source 10 and light source 2 11 to the first direction. It is known that both light source 10 and light source 2 11 can have multiple laser modules to emit multiple laser beams. Therefore, this embodiment can further optimize the optical path arrangement and adapt to the miniaturization of the overall structure.

[0057] like Figures 1-4 As shown, in this embodiment, a second light source 16 is also included. The light emitted by the second light source 16 is of a different color than the light emitted by the first light source. The beam splitter and combiner 1 also transmits the light emitted by the second light source 16. The second light source 16 emits light incident on the beam splitter and combiner 1 along a second direction, and the light emitted by the second light source 16 exits in the same direction as the combined light after passing through the beam splitter and combiner 1. In this embodiment, the light emitted by the second light source 16 is a red laser, which can enhance the color performance of the red field. A diffusion element 17 is also provided in the optical path from the second light source 16 to the beam splitter and combiner 1 to homogenize the light emitted by the second light source 16.

[0058] In this embodiment, the light-diffusing element 6 has an assembly of a color wheel 18 and a diffuser wheel 19 on its light-incident side. The diffuser wheel 19 diffuses the combined light and the light emitted by the second light source 16, while the color wheel 18 purifies the colors, thus ensuring that the new combined light rays incident on the light-diffusing element 6 are fully homogenized within the element, thereby guaranteeing image quality. Furthermore, a lens group 20 is provided on the light-incident side of the assembly of the color wheel 18 and the diffuser wheel 19. This lens group 20 can converge the various colors, thereby better directing them onto the light-diffusing element 6.

[0059] It should be noted that the light emitted by the light source system is projected onto the projection system through a DLP-architectural lens. Besides DLP architecture, the lens can also be an LCOS or LCD architecture.

[0060] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A light source system, characterized in that, It includes a first light source, a light splitting and combining element, a lens group, a wavelength conversion element, a polarization conversion element, and a light homogenizing element. The wavelength conversion element includes a non-fluorescent region and a fluorescent region, and the wavelength conversion element moves dynamically to sequentially switch the non-fluorescent region and the fluorescent region to the emission path of the light emitted by the first light source. The light-splitting and light-combining element transmits light of the first polarization state and reflects light of the third polarization state and radiates fluorescence. The first light source emits light of a first polarization state along a first direction. The light of the first polarization state passes through a beam splitter and beam combiner and is incident on a lens group to converge and irradiate a wavelength conversion element. The light of the first polarization state irradiates a fluorescent region, and the fluorescent region absorbs the light of the first polarization state to excite and generate radiative fluorescence. It also includes a reflective surface. The non-fluorescent region of the wavelength conversion element and the polarization conversion element are located between the light splitting and combining element and the reflective surface. In the optical path of the light in the first polarization state incident on the reflective surface, the polarization conversion element converts the light in the first polarization state into light in the second polarization state. The light in the second polarization state is reflected by the reflective surface and re-intruded into the polarization conversion element and converted into light in the third polarization state. The combined light formed by the radiative fluorescence and the third polarized state is emitted in the opposite direction along the first direction; The light-splitting and light-combining element reflects the combined light and emits it along the second direction to the light-uniforming element one; It also includes a second light source, the light emitted by the second light source being a different color than the light emitted by the first light source; The light-splitting and light-combining element also transmits light emitted from the second light source; The second light source emits light incident on the beam splitter and combiner along the second direction, and the light emitted by the second light source passes through the beam splitter and combiner and exits in the same direction as the combined light. Wherein, the first direction is perpendicular to the second direction.

2. The light source system as described in claim 1, characterized in that, The reflective surface is configured as the reflective surface of a mirror located on the light-emitting side of the non-fluorescent region, or as a reflective surface formed by depositing a reflective film in the non-fluorescent region, or as a polished surface of a metal substrate in the non-fluorescent region.

3. The light source system as described in claim 2, characterized in that, The polarization conversion element and the reflector are attached to the non-fluorescent region of the wavelength conversion element so as to follow the dynamic movement of the wavelength conversion element; Alternatively, the polarization conversion element and the reflector are separated from the wavelength conversion element and are in a fixed position.

4. A light source system as described in claim 3, characterized in that, The polarization conversion element is attached in segments to the non-fluorescent region of the wavelength conversion element.

5. A light source system as described in claim 3, characterized in that, The polarization conversion element is attached to the light-incident side of the wavelength conversion element, and the reflector is attached to the light-outceasing side of the wavelength conversion element. Alternatively, the polarization conversion element is attached to the light-emitting side of the wavelength conversion element, and the reflector is attached to the light-emitting side of the polarization conversion element.

6. A light source system as described in claim 2, characterized in that, The reflecting surface of the mirror is located in the focal region of the lens group one, and is parallel or approximately parallel to the surface of the wavelength conversion element, or is curved or arc-shaped relative to the surface of the wavelength conversion element.

7. A light source system as described in claim 1, characterized in that, A movable light-diffusing element two is provided on the light output path of the first light source so that the light spot formed on the wavelength conversion element matches the end face shape of the light-diffusing element one.

8. A light source system as described in claim 1, characterized in that, The wavelength conversion element includes at least one fluorescent region, and the magnitude of the current supplied to the first power source is adjustable so that when the first light source illuminates the fluorescent region and the non-fluorescent region, the brightness of the radiant fluorescence and / or the light of the third polarization state is adjusted.

9. A light source system as described in claim 1, characterized in that, The first light source has multiple light sources, which emit light from a first direction and / or a second direction and are guided to the first direction by the deflection component.

10. A light source system as described in claim 1, characterized in that, The wavelength conversion element is a quarter-wave plate or a rotator plate.

11. A light source system as described in claim 1, characterized in that, The light-diffusing element one has an assembly of a color wheel and a diffusion wheel on its light-incident side.

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

13. A projection system as described in claim 12, characterized in that, The light emitted by the light source system is projected onto the projection system through a lens with a DLP architecture.

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