Light source device and projection equipment

Abstract

The embodiment of the invention discloses a light source device which utilizes an integrated wavelength conversion device comprising a wavelength conversion area and a laser dissipation area, wavelength conversion of laser can be realized through the wavelength conversion area of the wavelength conversion device, and laser generated by a narrow-band light source can be dissipated through a laser diffusion area of the wavelength conversion device. A planar vibration device of an independent diffusion wheel or diffusion sheet is not needed, so that the speckle problem is effectively improved; and secondly, by adopting the light source device of the integrated wavelength conversion device, laser dissipation and laser fluorescence excitation are realized at the same time, a diffusion element does not need to be additionally arranged, the system size is reduced, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the field of optical technology, and in particular to a light source device and a projection device. Background Technology

[0002] In projection display products, the light source plays a crucial role. Its function is to convert light of different colors, angles, brightness, and shapes into a uniform light spot that illuminates the effective area of ​​the display chip.

[0003] With technological advancements, traditional light bulbs have been gradually phased out of the market due to their low efficiency and short lifespan. They have been replaced by new light sources such as light-emitting diodes (LEDs), phosphors, and lasers. These new light sources exhibit significant advantages in brightness, color reproduction, lifespan, and energy efficiency, and have become the mainstream choice in the projection display field.

[0004] However, while LED light sources excel in color performance and lifespan, achieving high brightness remains a technological challenge. Laser light sources offer high brightness and excellent color performance, but their high coherence makes them prone to speckle effects, which can negatively impact image quality. Therefore, achieving high brightness with minimal speckle in projection displays has become a pressing issue in the field. Summary of the Invention

[0005] An embodiment of this application provides a light source device.

[0006] The technical solution of this application is implemented as follows:

[0007] In a first aspect, embodiments of this application provide a light source device, the light source device comprising:

[0008] A light source assembly for emitting at least two types of lasers; the wavelength ranges of the at least two types of lasers do not overlap or partially overlap, and one or more of the at least two types of lasers have a first polarization state;

[0009] A wavelength conversion device includes a wavelength conversion region and a laser dissipation region. The wavelength conversion region is located in the optical path of a first laser with a first polarization state, and the laser dissipation region is located in the optical path of a second laser. The wavelength conversion region is used to generate a laser under the illumination of the first laser, and the laser dissipation region is used to dissipate the second laser to form a third laser. At least two lasers include the first laser and the second laser.

[0010] The beam combining component is used to guide the received laser and the third laser to combine and emit light from the same direction.

[0011] In the above scheme, the light combining component includes a first beam splitter and a beam combining element. The first beam splitter is located between the light source component and the wavelength conversion region, and the beam combining element is located at the intersection of the output optical path of the first beam splitter emitting the received laser and the output optical path of the wavelength conversion device emitting the second laser. The first beam splitter transmits the first laser of the first polarization state and reflects the received laser and the first laser of the second polarization state. The beam combining element transmits or reflects the first laser of the first polarization state and receives the laser, reflects or transmits the first laser and the second laser of the second polarization state.

[0012] In the above scheme, the wavelength conversion device includes a reflection zone located in the optical path of the first laser. The first laser is incident on the surface of the reflection zone and reflected to form a fourth laser. The beam combining component also includes one or more of a first phase difference element, a second phase difference element, and a first reflection element. The first phase difference element is located between the first beam splitting element and the wavelength conversion zone; the second phase difference element is located between the beam combining element and the laser dissipation zone; the first reflection element is located in the outgoing optical path of the fourth laser in the reflection zone; and the first beam splitting element is located between the first reflection element and the wavelength conversion zone.

[0013] In the above scheme, the first beam splitter includes a first region and a second region. The first region is used to transmit the first laser and reflect the laser beam, and the second region is used to reflect all light. The reflection region has scattering properties.

[0014] In the above scheme, the wavelength conversion device has at least one of the following features: the wavelength conversion region and the laser dissipation region are distributed in a ring shape along the radial direction of the substrate of the wavelength conversion device; the wavelength conversion region within the same ring shape includes one or more, and the wavelength conversion device moves periodically so that one or more wavelength conversion regions are periodically located on the optical path of the first laser at different times; different wavelength conversion regions absorb the first laser and emit different lasers; the wavelength conversion device also includes a reflection region, which is disposed between the wavelength conversion regions; the wavelength conversion device moves periodically so that the wavelength conversion region and the reflection region are periodically located on the optical path of the first laser at different times; the first laser is incident on the surface of the reflection region to be reflected to form a fourth laser.

[0015] In the above scheme, the wavelength conversion device also includes a single-sided compound eye element, which is glued or printed on the laser dissipation area of ​​the wavelength conversion device, or the single-sided compound eye element has a gap between the target position and the laser dissipation area; the single-sided compound eye element has a first surface with multiple sub-eyes for homogenizing the irradiated laser.

[0016] In the above scheme, the wavelength conversion region transmits or reflects the received laser and the first laser; the laser dissipation region transmits or reflects the second laser.

[0017] In the above scheme, the light source assembly includes one or more of a first light source, a second light source, and a first light guiding assembly. The first light source is used to generate a first laser, or to generate at least two types of lasers. The second light source is used to generate a second laser or supplementary light for the first laser. The light-emitting side of the first light source is located on the side of the light combining assembly away from the wavelength conversion device. The first laser with a first polarization state generated by the first light source is incident on the wavelength conversion region through a first beam splitter. The optical axis of the first laser is parallel to the optical axis of the laser being received. The light-emitting side of the second light source is located on the side of the laser dissipation region away from the light combining assembly. The second laser generated by the second light source passes through the laser dissipation region to reach the light combining assembly and is combined with the laser being received. Alternatively, the light-emitting side of the second light source is located on the side of the first light guiding assembly away from the laser dissipation region. The supplementary light of the first laser with a second polarization state generated by the second light source is guided by the first light guiding assembly to the laser dissipation region for dissipation, and then guided by the first light guiding assembly to the light combining assembly to be combined with the laser being received and the third laser for emission.

[0018] In the above scheme, the first light guiding component includes a second beam splitter and a third phase difference element. The second beam splitter transmits light of the first polarization state and reflects light of the second polarization state.

[0019] In the above scheme, the light source assembly includes a third light source and a second light guiding assembly. The second light guiding assembly includes a first optical path separating element, a first laser beam that is transmitted, and a first laser beam that is reflected; or, a first laser beam that is reflected. The first laser beam of the first polarization state generated by the third light source is partially reflected / or transmitted by the first optical path separating element and then guided to the wavelength conversion region by the second light guiding assembly at most. The first laser beam of the first polarization state generated by the third light source is partially transmitted / or reflected by the first optical path separating element and then guided to the laser dissipation region by the second light guiding assembly at most.

[0020] In the above scheme, the light source assembly includes a fourth light source, and the light combining assembly also includes a second reflective element with a through hole. The second reflective element is disposed between the fourth light source and the first beam splitter. The light-emitting side of the fourth light source is located on the side of the first beam splitter away from the wavelength conversion device. The first laser generated by the fourth light source passes through the through hole of the second reflective element and the first beam splitter and is incident into the wavelength conversion region to generate received laser and residual first laser. The received laser is reflected by the first beam splitter and transmitted or reflected by the light combining element and emitted. The residual first laser is transmitted through the first beam splitter and reflected by the second reflective element and re-incidentally into the wavelength conversion region for laser recycling.

[0021] In the above scheme, the wavelength conversion device includes a reflection area located in the optical path of the first laser. The light source assembly includes a fifth light source, and the light combining assembly further includes a third light guiding assembly. The third light guiding assembly includes a seventh beam splitter, multiple third reflective elements, and a fourth phase difference element. The first beam splitter is a moving element. The multiple third reflective elements are arranged around the wavelength conversion device. The first beam splitter transmits a portion of the first laser and reflects a portion of the first laser and a portion of the received laser, transmitting light of a first polarization state and reflecting light of a second polarization state. The seventh beam splitter transmits the first laser and reflects the second laser. The third reflective elements reflect all light. The fifth... A portion of the first laser beam in the first polarization state generated by the light source is transmitted through the first beam splitter and the fourth phase difference element, and then irradiates the wavelength conversion region or reflection region to generate the received laser beam and the fourth laser beam in the first polarization state. The received laser beam and the fourth laser beam in the first polarization state are then reflected again by the fourth phase difference element, the first beam splitter, and the beam combiner. A portion of the first laser beam generated by the fifth light source is reflected by the first beam splitter, transmitted through the seventh beam splitter, and then, together with the second laser beam generated by the fifth light source, reflected by multiple third reflection elements, dissipated by the laser dissipation region, transmitted through the beam combiner, and combined with the received laser beam and the fourth laser beam for emission.

[0022] In the above scheme, the wavelength conversion device includes a reflection region located in the optical path of the first laser. The light source assembly includes a sixth light source, the light-emitting side of which is located on the side of the first beam splitter away from the wavelength conversion device. The sixth light source is used to generate the first laser with a first polarization state. The beam combining assembly also includes a fourth reflection element, which is disposed between the first beam splitter and the beam combining element, or disposed on the side of the beam combining element away from the first beam splitter, or disposed between the beam combining element and the wavelength conversion device. The first laser with the first polarization state is transmitted through the first beam splitter and irradiates the wavelength conversion region to generate the laser with the first polarization state and the second polarization state. The received laser light of the first polarization state is reflected by the first beam splitter, transmitted or reflected by the beam combiner and emitted; the received laser light of the second polarization state is reflected by the first beam splitter, reflected or transmitted by the beam combiner, reflected by the fourth reflector, reflected or transmitted by the beam combiner, and reflected by the first beam splitter to the diffuse reflection region. After diffuse reflection, it is reflected again by the first beam splitter, reflected or transmitted by the beam combiner and emitted, and so on, so that the beam combiner emits all the received laser light of the second polarization state; or, the received laser light of the second polarization state is reflected by the first beam splitter, reflected by the fourth reflector, and transmitted by the beam combiner to the laser dissipation region or the diffuse reflection region; the wavelength ranges of the first laser light and the received laser light overlap.

[0023] Secondly, embodiments of this application provide a projection device, which includes the light source device described in any of the first aspects above.

[0024] The light source device and light source assembly provided in this application embodiment are used to emit at least two types of lasers; the wavelength ranges of the at least two types of lasers do not overlap or partially overlap, and one or more of the at least two types of lasers have a first polarization state; a wavelength conversion device includes a wavelength conversion region and a laser dissipation region, the wavelength conversion region is located in the optical path of the first laser with the first polarization state, and the laser dissipation region is located in the optical path of the second laser, the wavelength conversion region is used to generate a received laser under the irradiation of the first laser, and the laser dissipation region is used to dissipate the second laser to form a third laser; the at least two types of lasers include the first laser and the second laser; a beam combining assembly is used to guide the received laser and the third laser to combine and emit from the same direction. Thus, firstly, by utilizing an integrated wavelength conversion device that includes a wavelength conversion zone and a laser dissipation zone, the wavelength conversion zone of the wavelength conversion device can achieve wavelength conversion of the laser, and the laser diffusion zone of the wavelength conversion device can dissipate the supplementary light generated by the narrow-band light source, eliminating the need for a separate diffuser wheel or planar vibration device for the diffuser sheet, effectively improving speckle problems. Secondly, by using a light source device with an integrated wavelength conversion device, supplementary light dissipation and laser-excited fluorescence can be achieved simultaneously, eliminating the need for additional diffusion elements, reducing system size and lowering costs. Finally, by utilizing the mixing mode of the supplementary laser and fluorescence after dissipation processing, the projection system meets the requirements for high color gamut and high brightness, while eliminating laser speckle and color fringing ghosting phenomena, improving the quality of the projected image, and thus enhancing the user's viewing experience. Attached Figure Description

[0025] Figure 1 A schematic diagram of an optional light source device provided in this application embodiment. Figure 1 ;

[0026] Figure 2 A schematic diagram of an optional wavelength conversion device provided in an embodiment of this application;

[0027] Figure 3 A schematic diagram of an optional light source device provided in this application embodiment. Figure 2 ;

[0028] Figure 4 A schematic diagram of an optional light source device provided in this application embodiment. Figure 3 ;

[0029] Figure 5 A schematic diagram of an optional light source device provided in this application embodiment. Figure 4 ;

[0030] Figure 6 A schematic diagram of an optional light source device provided in this application embodiment. Figure 5 ;

[0031] Figure 7A schematic diagram of an optional light source device provided in this application embodiment. Figure 6 ;

[0032] Figure 8 A schematic diagram of an optional light source device provided in this application embodiment. Figure 7 ;

[0033] Figure 9 A schematic diagram of an optional light source device provided in this application embodiment. Figure 8 ;

[0034] Figure 10 A schematic diagram of an optional light source device provided in this application embodiment. Figure 9 ;

[0035] Figure 11 A schematic diagram of an optional light source device provided in this application embodiment. Figure 10 ;

[0036] Figure 12 A schematic diagram of an optional light source device provided in this application embodiment. Figure 10 one;

[0037] Figure 13 A schematic diagram of an optional light source device provided in this application embodiment. Figure 10 two;

[0038] Figure 14 A schematic diagram of an optional light source device provided in this application embodiment. Figure 10 three;

[0039] Figure 15 A schematic diagram of an optional light source device provided in this application embodiment. Figure 10 Four;

[0040] Figure 16 A schematic diagram of an optional light source device provided in this application embodiment. Figure 10 five;

[0041] Figure 17 A schematic diagram of an optional light source device provided in this application embodiment. Figure 10 six;

[0042] Figure 18 This is a schematic diagram of an optional projection device provided in an embodiment of this application. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0044] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0045] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] This application provides a light source device, see [link]. Figure 1 and Figure 2 , Figure 1 The diagram shown is a structural schematic of a light source device. Figure 2 This is a schematic diagram of a wavelength conversion device. The light source device 100 includes:

[0047] Light source assembly 1 is used to emit at least two types of lasers; the wavelength ranges of the at least two types of lasers do not overlap or partially overlap, and one or more of the at least two types of lasers have a first polarization state;

[0048] The wavelength conversion device 2 includes a wavelength conversion region 21 and a laser dissipation region 22. The wavelength conversion region 21 is located in the optical path of the first laser with a first polarization state, and the laser dissipation region 22 is located in the optical path of the second laser. The wavelength conversion region 21 is used to generate the laser under the irradiation of the first laser, and the laser dissipation region 22 is used to dissipate the second laser to form a third laser. At least two lasers include the first laser and the second laser.

[0049] The beam combining component 3 (not shown in the figure) is used to guide the received laser and the third laser to combine and emit light from the same direction.

[0050] In this embodiment of the application, the light source component is used to emit narrow-spectrum light, which includes at least two types of lasers whose wavelength ranges do not overlap at least partially, such as red laser and blue laser whose wavelength ranges do not overlap completely, and / or two types of blue lasers whose wavelength ranges partially overlap, and / or three types of lasers such as red laser, blue laser and green laser whose wavelength ranges do not overlap completely.

[0051] In the embodiments of this application, the first laser among at least two lasers, such as a blue laser, is used as the excitation light to excite the phosphor layer to generate the received laser (also known as fluorescence), and the second laser among at least two lasers, such as one or more of a red laser, a green laser, and a blue laser, can be used as a supplementary light to combine with the received laser.

[0052] In this embodiment, the light source assembly may include one or more of the following: a tri-color laser light source, a monochromatic laser light source, an LED light source, a monochromatic LED light source, a laser diode (LD) light source, and an ultraviolet (UV) light source. Furthermore, the optical axes of the multiple lasers emitted by the light source assembly are coaxial, resulting in high optical path light collection efficiency. In some embodiments, the narrow-spectrum light emitted by the light source assembly may also include only a beam of one wavelength range. In some embodiments, the light source included in the light source assembly for generating at least two lasers may be the same light source, which may be located on one side of the wavelength conversion device. Of course, the light source for generating at least two lasers may also be at least two different light sources, which may be located on the same side of the wavelength conversion device or on opposite sides of the wavelength conversion device; this application does not impose specific limitations on this.

[0053] In this embodiment, the laser can have polarization characteristics. The laser can have parallel (P) polarization and perpendicular (Senkrecht, S) polarization. Here, parallel polarization is also called linear polarization; in other words, the laser can have P polarization state and / or S polarization state.

[0054] In this embodiment, the light source assembly is used to generate at least two types of lasers. The first laser has a first polarization state, and the second laser may or may not have a polarization state, such as a second polarization state. Here, the first polarization state can be a P-polarization state, and the second polarization state can be an S-polarization state. The laser with the first polarization state can be a blue laser, and the laser with the second polarization state can be a red laser, a red laser and a blue laser, or a tri-color laser. This application does not impose specific limitations on this.

[0055] In this embodiment, the third laser is formed by the dissipation of the second laser by the laser dissipation region of the wavelength conversion device. Therefore, the third laser and the second laser are lasers with the same properties. For example, the second laser can be one or more of red laser, green laser and blue laser, and the third laser can also be one or more of red laser, green laser and blue laser.

[0056] In this embodiment, the wavelength conversion device includes a wavelength conversion region and a laser dissipation region.

[0057] The aforementioned wavelength conversion region includes wavelength conversion materials or structures capable of absorbing excitation light, such as blue laser light, and emitting wavelengths whose range partially overlaps with the waveplate range of the laser. Here, the wavelength conversion material can be a phosphor or phosphor, etc.; for example, it can be a yellow phosphor that emits yellow light upon excitation, such as a yttrium aluminum garnet (YAG) phosphor containing cerium (Ce) as an activator; it can also be green phosphor, red phosphor, cyan phosphor, orange phosphor, etc. Specific fluorescent materials can be selected according to actual needs, and this application does not impose specific limitations on them. It should be noted that under the action of the wavelength conversion region, the emitted laser light generally exhibits a Lambertian distribution, and the principal optical axis is perpendicular to the wavelength conversion region.

[0058] The aforementioned laser dissipation zone transmits or reflects the second laser. The laser dissipation zone can be a reflective laser dissipation zone or a transmissive laser dissipation zone. The laser dissipation zone can make the passed laser beam more uniform, reduce brightness inconsistencies, thereby eliminating hot spots or dark spots, and making the brightness of the entire projection area more uniform. Furthermore, the laser dissipation zone can disrupt the phase of the laser, destroy the spatial coherence of the laser, and amplify the laser beam, thereby achieving dissipation processing of the incident laser, thus eliminating the laser speckle effect and reducing speckle problems in the projected image.

[0059] In this embodiment, the light combining component can guide the laser emitted by the wavelength conversion device and the third laser to be combined and emitted from the same direction.

[0060] In one feasible embodiment, a first laser beam with a first polarization state emitted from the light source assembly serves as excitation light, and a second laser beam emitted as supplementary light irradiates a wavelength conversion device. Due to the periodic movement of the wavelength conversion device, its wavelength conversion region can be continuously or sequentially positioned along the optical path of the first laser beam. The wavelength conversion region absorbs the first laser beam and emits the received laser beam. The laser dissipation region of the wavelength conversion device is continuously positioned along the optical path of the second laser beam, dissipating the second laser beam to form a third laser beam. Furthermore, the received laser beam and the third laser beam are guided by a beam combining component to combine and emit in the same direction.

[0061] The light source device and light source assembly provided in this application embodiment are used to emit at least two types of lasers; the wavelength ranges of the at least two types of lasers do not overlap or partially overlap, and one or more of the at least two types of lasers have a first polarization state; a wavelength conversion device includes a wavelength conversion region and a laser dissipation region, the wavelength conversion region is located in the optical path of the first laser with the first polarization state, and the laser dissipation region is located in the optical path of the second laser, the wavelength conversion region is used to generate a received laser under the irradiation of the first laser, and the laser dissipation region is used to dissipate the second laser to form a third laser; the at least two types of lasers include the first laser and the second laser; a beam combining assembly is used to guide the received laser and the third laser to combine and emit from the same direction. Thus, firstly, by utilizing an integrated wavelength conversion device that includes a wavelength conversion zone and a laser dissipation zone, the wavelength conversion zone of the wavelength conversion device can realize the wavelength conversion of the excitation light, and the laser diffusion zone of the wavelength conversion device can dissipate the supplementary light generated by the narrow-band light source. This eliminates the need for a separate diffuser wheel or planar vibration device for the diffuser sheet, effectively improving speckle problems. Secondly, by using a light source device with an integrated wavelength conversion device, both the dissipation of supplementary light and the excitation of fluorescence by excitation light can be achieved simultaneously. This eliminates the need for additional diffusion elements, reducing system size and lowering costs. Finally, by utilizing the mixing mode of the dissipated supplementary laser and fluorescence, the high color gamut and high brightness requirements of the projection system are met, while eliminating laser speckle and color fringing ghosting phenomena, improving the quality of the projected image, and thus enhancing the user's viewing experience.

[0062] In some embodiments, the wavelength conversion device has at least one of the following features:

[0063] The wavelength conversion region and the laser dissipation region are distributed in a ring shape along the radial direction of the substrate of the wavelength conversion device;

[0064] The wavelength conversion region within the same annular shape includes one or more wavelength conversion regions. The wavelength conversion device moves periodically so that one or more wavelength conversion regions are periodically located in the optical path of the first laser. Different wavelength conversion regions absorb the first laser and emit different laser beams.

[0065] The wavelength conversion device also includes a reflection zone, which is disposed between the wavelength conversion zones. The wavelength conversion device moves periodically so that the wavelength conversion zone and the reflection zone are periodically positioned in the optical path of the first laser. The first laser is incident on the surface of the reflection zone and is reflected to form a fourth laser.

[0066] In this embodiment, the wavelength conversion region and the laser dissipation region are arranged in a ring shape along the radial direction of the substrate of the wavelength conversion device. For example, the wavelength conversion region may be located inside the ring of the substrate of the wavelength conversion device, and the laser dissipation region may be located outside the ring of the substrate of the wavelength conversion device. Thus, the wavelength conversion region can continuously process the first laser, i.e., the excitation light, and the laser dissipation region can continuously process the second laser, i.e., the supplementary light. Furthermore, since the laser dissipation region is located outside the ring, while dissipating the supplementary light and improving image quality, it can better dissipate the excess heat carried by the excitation light that is not absorbed by the wavelength conversion region, thereby reducing the thermal load on the wavelength conversion region and improving the thermal stability of the system.

[0067] In this embodiment of the application, the wavelength conversion device may include one or more wavelength conversion regions, and the one or more wavelength conversion regions are located in different regions of the same annular shape. Each wavelength conversion region may correspond to a wavelength conversion material, which can generate at least one type of laser-received light (also known as fluorescence) whose wavelength range does not completely overlap with the wavelength range of the laser. That is, the generated laser-received light includes at least one color light whose wavelength range is different from the wavelength range of the laser. For example, the fluorescence may be at least one of red fluorescence, green fluorescence, yellow fluorescence, cyan fluorescence, and orange fluorescence.

[0068] In this embodiment of the application, during the periodic movement of the wavelength conversion device, multiple wavelength conversion regions can be located periodically or sequentially on the optical path of the first laser, which allows different wavelength conversion regions to work at different times, disperses the effect of the excitation light on a single wavelength conversion region, reduces heat accumulation, and extends the service life of the light source.

[0069] In this embodiment, the wavelength conversion device includes a reflection region, which includes a reflection element for reflecting various lasers. The reflection region does not change the angular distribution of the laser. Therefore, the angular distributions of the first laser and the fourth laser are approximately the same, and the fourth laser is emitted symmetrically relative to the first laser. The emission direction can be perpendicular or not perpendicular to the reflection region. Thus, the principal optical axes of the received laser and the fourth laser can coincide or not coincide.

[0070] In this embodiment, the reflective area is disposed between the wavelength conversion areas, so that during the periodic movement of the wavelength conversion device, one or more wavelength conversion areas and the reflective area can be periodically and time-divided into the optical path of the first laser, thereby ensuring continuous laser processing. Thus, since the reflective area is disposed on the wavelength conversion device, during the periodic rotation of the wavelength conversion device, the reflected spot of the first laser, i.e., the fourth laser, experiences slight vibration due to the movement of the wavelength conversion device, which can dissipate the reflected spot.

[0071] It should be noted that the radial width of the reflection zone extending to the center is greater than or equal to the radial width of the wavelength conversion zone extending to the center. This ensures that more of the first laser beam can completely irradiate the reflection zone, thereby improving the optical conversion efficiency.

[0072] In this embodiment, the fourth laser is a laser formed by reflecting the first laser through the reflective area of ​​the wavelength conversion device. Therefore, the fourth laser and the first laser are lasers with the same properties. For example, the first laser can be a blue laser, and the fourth laser can also be a blue laser.

[0073] In this embodiment of the application, the light combining component can also guide the laser beam, the third laser beam, and the fourth laser beam emitted by the wavelength conversion device to be combined and emitted from the same direction.

[0074] In one feasible scenario, refer to Figure 2 The diagram shows a schematic of a wavelength conversion device. In the left diagram, the device includes a wavelength conversion region (e.g., 21), a reflection region (23), and a laser dissipation region (22). In the right diagram, the device includes two wavelength conversion regions (e.g., 211 and 212), a reflection region (23), and a laser dissipation region (22). The wavelength conversion region and the laser dissipation region are arranged in a ring shape, with the wavelength conversion region and the reflection region located inside the ring, and the laser dissipation region located outside the ring. It should be noted that the radial width of the reflection region extending to the center of the ring is greater than or equal to the radial width of the wavelength conversion region extending to the center of the ring. The ratio of the wavelength conversion region to the reflection region in the wavelength conversion device can be changed according to actual conditions. Furthermore, the location of the reflection region in the wavelength conversion device can be changed to a transmission region, so that after the first laser beam passes through the transmission region of the wavelength conversion device, it is guided by other components and then combined with the received laser beam and the third laser beam before being emitted.

[0075] In some embodiments, continue to refer to Figure 1 The light combining component 3 includes a first beam splitting element 31 and a beam combining element 32. The first beam splitting element 31 is located between the light source component 1 and the wavelength conversion region 21. The beam combining element 32 is located at the intersection of the output light path of the first beam splitting element 31 that emits the laser and the output light path of the wavelength conversion device 2 that emits the second laser.

[0076] The first beam splitter 31 transmits a first laser beam with a first polarization state and reflects a first laser beam with a second polarization state.

[0077] The light combining element 32 transmits or reflects a first laser beam with a first polarization state, and receives, reflects or transmits a first laser beam with a second polarization state.

[0078] In this embodiment, the first beam splitter is located in the optical path of the first laser emitted from the light source assembly, and is situated between the light source assembly and the wavelength conversion region. The first beam splitter can transmit the first laser with a first polarization state, reflect the first laser with a second polarization state, and receive the laser light; the first laser can be a blue laser.

[0079] In this embodiment, the beam combining element can be located in the optical path of the second laser, and is positioned at the intersection of the output optical path of the first beam splitter emitting the received laser and the output optical path of the wavelength conversion device emitting the second laser. The beam combining element can transmit the first laser with a first polarization state, receive the laser, and reflect the first and second lasers with second polarization states. Alternatively, the beam combining element can also reflect the first laser with a first polarization state, receive the laser, and transmit the first and second lasers with second polarization states. It should be noted that the beam combining element can also transmit light with a first polarization state and reflect light with a second polarization state; or, the beam combining element can reflect light with a first polarization state and transmit light with a second polarization state.

[0080] In this embodiment, the light source assembly emits a first laser and a second laser with different wavelength ranges. The first laser has a first polarization state, and the second laser may or may not have a second polarization state. The first laser with the first polarization state is transmitted through a first beam splitter to a wavelength conversion device. The wavelength conversion region in the wavelength conversion device absorbs the first laser and emits the received laser; the received laser is reflected by the first beam splitter and transmitted through a beam combiner before being emitted. The second laser irradiates the laser dissipation region of the wavelength conversion device, dissipating the second laser to form a third laser. The third laser, after being reflected by at least the beam combiner, is emitted in the same direction as the received laser.

[0081] As described above, the first beam splitter only transmits the first laser beam of the required first polarization state and reflects the laser beam, ensuring efficient use of light. The beam combiner transmits or reflects light of different polarization states as needed, further improving the utilization rate of light. Through the combined use of the first beam splitter and the beam combiner, the path of light can be precisely controlled, ensuring that all the required light can be emitted correctly. Finally, by effectively separating and combining light of different polarization states, speckle effect can be reduced, and the clarity and smoothness of the image can be improved.

[0082] In some embodiments, the light source device further includes one or more of a first shaping element, a filter element, a second shaping element, a third shaping element, and a first light-uniforming element, wherein...

[0083] The first shaping element is disposed between the first beam splitter and the wavelength conversion region of the wavelength conversion device;

[0084] The filter element is positioned between the first beam-splitting element and the beam-combining element;

[0085] The second shaping element is positioned between the laser dissipation region of the light combining element and the wavelength conversion device;

[0086] The third shaping element and the first uniform light element are positioned in the emission direction of the light-combining element's emission path.

[0087] In this embodiment, a first shaping element is disposed between the first beam splitter and the wavelength conversion region. The first shaping element focuses the first laser beam with a first polarization state transmitted from the first beam splitter onto the wavelength conversion device, either directly or obliquely, to excite fluorescence and reflect the resulting laser. Simultaneously, the first shaping element performs focusing and shaping or collimation processing on the fluorescence and laser beam emitted from the wavelength conversion component. The second shaping element can be a shaping lens. Thus, by reducing scattering and unnecessary light loss, the shaping element can improve the overall light energy utilization rate of the system, thereby reducing energy consumption and enhancing the effectiveness of illumination or detection, and improving light energy utilization.

[0088] In this embodiment, filtering fluorescence of certain wavelengths to improve the color gamut can be achieved by setting a filtering element. The filtering element can be a movable filter element or a color filter wheel, and the color filter wheel includes multiple partitioned filter elements. Different partitioned filter elements filter fluorescence of different colors or wavelengths, and the period of the color filter wheel for filtering a certain color or wavelength of fluorescence is the same as the movement period of the fluorescence excited by the wavelength conversion device. Of course, filtering fluorescence of certain wavelengths to improve the color gamut can also be achieved by coating the wavelength conversion region, coating the first beam splitter element, coating the beam combining element, and / or setting the wavelength. For example, coating the wavelength conversion region is used to filter fluorescence; another example is setting the wavelength of the beam combining element, where the beam combining element removes the left and right or long and short wavelength portions of the green fluorescence spectrum, leaving the peak segment, thereby improving color purity.

[0089] In this embodiment, the second shaping element is disposed between the light combining element and the laser dissipation region of the wavelength conversion device, thereby focusing and shaping or collimating the incident laser light to make the light rays exit in parallel. The second shaping element can be a shaping lens or a light-diffusing element such as a compound eye.

[0090] In this embodiment, the third shaping element and the first homogenizing element are positioned in the emission direction of the laser and / or supplementary light emitted from the combining element. The emitted laser and / or supplementary light is homogenized using the third shaping element and the homogenizing element. In this way, the shaping element and the homogenizing element can transform the originally uneven light intensity distribution into a uniform light field. Through mechanisms such as scattering, refraction, or reflection, the shaping element and the homogenizing element can effectively reduce hot spots (overly bright areas) and dark areas in the light spot, improve visual comfort and image quality, and at the same time reduce light energy loss and improve the overall efficiency of the light source system.

[0091] In some embodiments, refer to Figure 3 As shown, the wavelength conversion device includes a reflective region located in the optical path of the first laser. The first laser is incident on the surface of the reflective region and reflected to form a fourth laser. The light combining assembly also includes one or more of a first phase difference element 33, a second phase difference element 34, and a first reflective element 35, wherein...

[0092] The first phase difference element 33 is located between the first beam splitter 31 and the wavelength conversion region 21;

[0093] The second phase difference element 34 is located between the light combining element 32 and the laser dissipation region 22;

[0094] The first reflective element 35 is located in the output light path of the fourth laser, and the first beam splitter 31 is located between the first reflective element 35 and the wavelength conversion region 21.

[0095] In this embodiment, the wavelength conversion device includes a reflection area disposed between the wavelength conversion areas. Thus, during the periodic movement of the wavelength conversion device, one or more wavelength conversion areas and reflection areas can be periodically and time-divisionally positioned on the optical path of the first laser, thereby ensuring continuous laser processing. Furthermore, since the reflection areas are disposed on the wavelength conversion device, during the periodic rotation of the wavelength conversion device, the reflected light spot of the first laser, i.e., the fourth laser, experiences slight vibration due to the movement of the wavelength conversion device, which can dissipate the reflected light spot.

[0096] It should be noted that the radial width of the reflection zone extending to the center is greater than or equal to the radial width of the wavelength conversion zone extending to the center. This ensures that more of the first laser beam can completely irradiate the reflection zone, thereby improving the optical conversion efficiency.

[0097] In this embodiment, the first phase difference element and the second phase difference element are phase difference elements. Phase difference elements are used to change the polarization state of light. Polarization can be understood as the direction of light vibration, and can be divided into three types: linear polarization, circular polarization, and elliptical polarization. The phase difference element can be a waveplate, which includes half-wave plates (1 / 2 waveplate or λ / 2) and quarter-wave plates (1 / 4 waveplate or λ / 4), used to generate phase delays of π and π / 2, respectively.

[0098] In this embodiment, the first reflective element is used to change the direction of light transmission, causing it to converge or diverge. The first reflective element can be positioned at an angle so that the reflected laser light irradiates along a preset optical path direction. For example, the first reflective element can be placed parallel to the first beam-splitting element. The first reflective element can be a curved reflector or a flat reflector.

[0099] In one embodiment of this application, the wavelength conversion device includes a reflection region, and a first phase difference element is disposed between a first beam splitter and the wavelength conversion region or reflection region. A first laser beam of a first polarization state, i.e., excitation light, emitted from the light source assembly, is transmitted through the first beam splitter and delayed by the phase difference of the first phase difference element, periodically or time-divisionally striking the wavelength conversion region or reflection region of the wavelength conversion device. The wavelength conversion region absorbs the first laser beam (excitation light) and emits the received laser beam. The reflection region reflects the first laser beam, forming a fourth laser beam. The fourth laser beam is again delayed by the phase difference of the first phase difference element. It should be noted that because the first laser beam passes through the first phase difference element twice, its polarization state changes from a first polarization state to a second polarization state, thus obtaining a fourth laser beam of a second polarization state; here, the optical axis of the first laser beam and the optical axis of the received laser beam are parallel. Subsequently, the received laser beam and the fourth laser beam of the second polarization state are reflected by the first beam splitter and transmitted through the beam combining element before being emitted. The second laser emitted from the light source assembly, i.e., the supplementary light, illuminates the laser dissipation region of the wavelength conversion device, dissipating the second laser to form a third laser. This third laser, after being reflected by the light combining element, is emitted in the same direction as the received laser and the fourth laser. For example, refer to... Figure 3 As shown in the left figure, by adding a first phase difference element between the first beam splitter and the wavelength conversion region or reflection region, the polarization state of the excitation light is changed by using the first phase difference element. This ensures that excitation light with different polarization states can be effectively separated and combined, thereby improving the utilization rate of the excitation light and thus improving the overall system's luminous efficiency. It should be noted that the embodiments of this application are also applicable to other embodiments.

[0100] In another embodiment of this application, a second phase difference element is provided between the beam combining element and the laser dissipation region. The first laser beam of the first polarization state emitted from the light source assembly, i.e., the excitation light, is transmitted through the first beam splitter to the wavelength conversion region of the wavelength conversion device. The wavelength conversion region absorbs the first laser beam and emits the received laser beam. The received laser beam is reflected by the first beam splitter and transmitted through the beam combining element before being emitted. The second laser beam of the second polarization state emitted from the light source assembly, i.e., the supplementary light, is transmitted through the beam combining element and delayed by the phase difference of the second phase difference element, striking the laser dissipation region of the wavelength conversion device. The laser dissipation region dissipates the second laser beam, forming a third laser beam. The third laser beam is again delayed by the phase difference of the second phase difference element. It should be noted that because the second laser beam passes through the second phase difference element twice, its polarization state changes from the second polarization state to the first polarization state, thus obtaining the third laser beam of the first polarization state. Afterwards, the third laser beam of the first polarization state is reflected by the beam combining element and emitted in the same direction as the received laser beam. For example, refer to... Figure 3The middle figure is shown in the diagram. Thus, by adding a second phase difference element between the light combining element and the laser dissipation region, and by changing the polarization state of the supplementary light using the second phase difference element, it is ensured that supplementary light with different polarization states can be effectively separated and combined, thereby improving the utilization rate of the supplementary light and thus improving the overall system's optical efficiency. It should be noted that the embodiments of this application are also applicable to other embodiments.

[0101] In another embodiment of this application, the wavelength conversion device includes a reflection region, a first reflection element is disposed in the output optical path of the fourth laser, and a first beam splitter is located between the first reflection element and the wavelength conversion region or the reflection region. The first laser of the first polarization state emitted by the light source assembly, i.e., the excitation light, is transmitted through the first beam splitter and obliquely incident into the wavelength conversion region and the reflection region of the wavelength conversion device in a time-division manner. The wavelength conversion region absorbs the first laser and emits the received laser, while the reflection region reflects the first laser to form the fourth laser. Since reflection does not change the angular distribution of the laser, the received laser reflected out by the wavelength conversion region is obliquely incident into the first beam splitter, which reflects the received laser, and then reaches the beam combiner for transmission and emission. The fourth laser reflected out by the reflection region is obliquely incident into the first beam splitter, which transmits the fourth laser, reaching the first reflection element, which reflects the fourth laser, and then transmits it through the first beam splitter to the beam combiner for transmission and emission. The second laser emitted from the light source assembly, i.e., the supplementary light, illuminates the laser dissipation region of the wavelength conversion device, dissipating the second laser to form a third laser. This third laser, after being reflected by the light combining element, is emitted in the same direction as the received laser and the fourth laser. For example, refer to... Figure 3 As shown in the right figure. In this way, the fourth laser reflected by the first reflecting element is reflected again, thereby combining the excitation light, the received laser, and the supplementary laser, thus improving the laser utilization rate.

[0102] In some embodiments, continue to refer to Figure 3 In the left and middle diagrams, the first beam splitter 31 includes a first region and a second region. The first region is used to transmit the first laser and reflect the laser beam, and the second region is used to reflect all light. The reflection region has diffusion properties.

[0103] In this embodiment, the first beam splitter is located in the optical path of the first laser emitted from the light source assembly, and is situated between the light source assembly and the wavelength conversion region or reflection region. The first beam splitter includes a first region and a second region. The first region can be the area where the first laser strikes the first beam splitter, and the second region can be any region within the first beam splitter other than the first region. For example, the first region can be the upper right corner of the first beam splitter, but it can also be any other region. Here, the first beam splitter can be partitioned with a coating, such as transmitting the first laser to the first region and reflecting the laser light, while the second region reflects all light. Here, the first laser can be a blue laser.

[0104] In this embodiment, the reflection region of the wavelength conversion device has diffusion properties. After the laser light is reflected by the wavelength conversion region, it diffuses and the light spot becomes larger.

[0105] In one feasible scenario, the wavelength conversion device periodically moves such that the wavelength conversion region and the reflection region are periodically positioned on the optical path of the first laser. A light source assembly emits a first laser and a second laser with different wavelength ranges. The first laser has a first polarization state, and the second laser may or may not have a second polarization state. The first laser with the first polarization state is transmitted through a first region of a first beam splitter and time-divisionally irradiates the wavelength conversion region and the reflection region of the wavelength conversion device. The wavelength conversion region of the wavelength conversion device absorbs the first laser and emits the received laser; the received laser is reflected by the first and second regions of the first beam splitter and transmitted through a beam combining element before being emitted; the reflection region of the wavelength conversion device reflects and scatters the first laser to expand its spot size. Further, the first laser reflected and scattered by the reflection region is reflected by the second region of the first beam splitter and transmitted through a beam combining element before being emitted; the first laser reflected and scattered by the reflection region is lost by the first region of the first beam splitter. The second laser irradiates the laser dissipation region of the wavelength conversion device, dissipating the second laser to form a third laser. The third laser, after being reflected by the beam combining element, is emitted in the same direction as the received laser.

[0106] In some embodiments, a reflective element may be disposed between the light source assembly and the first beam splitter to reflect the light transmitted through the first region of the first beam splitter. Here, when the wavelength conversion region absorbs the first laser to generate the received laser and residual first laser, the reflective element reflects the residual first laser transmitted through the first region of the first beam splitter, which then passes through the first region of the first beam splitter again to irradiate the wavelength conversion region to re-excite and generate the received laser. Thus, the first laser generated by the first light source, such as blue laser, is used as excitation light and is incident on the wavelength conversion region through the first region of the first beam splitter to generate the received laser. Since the wavelength conversion region may not completely absorb the first laser, there is residual first laser. The first laser that is not completely absorbed by the wavelength conversion region (residual first laser) is guided back to the wavelength conversion region for re-conversion after being transmitted by the first beam splitter and reflected by the reflective element. In this way, by recovering unused excitation light, the overall light energy conversion efficiency is improved; at the same time, the light energy that is converted into heat due to ineffective utilization is reduced, which helps the system's heat dissipation and stability.

[0107] As described above, by partitioning the first beam splitter with a coating, the first region of the first beam splitter transmits the first laser beam of the required first polarization state; the second region of the first beam splitter reflects and scatters the laser beam, ensuring efficient use of light; the beam combiner transmits or reflects light of different polarization states as needed, further improving the light utilization rate; through the combined use of the first beam splitter and the beam combiner, the light path can be precisely controlled, ensuring that all the required light can be correctly emitted; finally, by effectively separating and combining light of different polarization states, speckle effect can be reduced, and the clarity and smoothness of the image can be improved.

[0108] In some embodiments, refer to Figure 4 As shown, the wavelength conversion device 2 also includes a single-sided compound eye element 24, which is glued or printed on the laser dissipation area 22 of the wavelength conversion device 2, or the single-sided compound eye element 24 has a gap between the target position and the laser dissipation area 22.

[0109] The single-sided compound eye element 24 has a first surface with multiple sub-eyes for homogenizing the irradiated laser light.

[0110] In this embodiment, the single-sided compound eye element has a first surface with multiple sub-eyes (such as lens units), and is used to homogenize laser light. The single-sided compound eye element can be a flat-top diffuser.

[0111] In this embodiment, the cross-section of the sub-eye on the first surface of the single-sided compound eye element has a first shape, such that the light spot of the laser passing through the single-sided compound eye element is of the first shape. Exemplarily, the first shape can be a rectangle or a regular polygon, such as a regular hexagon or a regular octagon, further improving the uniform light effect of the single-sided compound eye element. In other embodiments, the first shape can also be a circle, ellipse, triangle, or irregular shape, etc., and this application does not impose any limitations on this.

[0112] In this embodiment, the single-sided compound eye element is glued or printed on the laser dissipation area of ​​the wavelength conversion device, meaning the single-sided compound eye element is closely attached to the laser dissipation area. In other words, single-sided compound eye elements are deployed in the laser dissipation area of ​​the outer ring of the wavelength conversion device. This allows for laser homogenization while simultaneously dissipating the laser beam. Of course, there is a gap between the single-sided compound eye element and the laser dissipation area, allowing multiple sub-beams from the single-sided compound eye element to uniformly illuminate the laser dissipation area. This means fewer single-sided compound eye elements can be deployed, improving light distribution and making the dissipation process more uniform, reducing hot spots or dark spots, thus reducing cost and the size of the wavelength conversion device. Controlling the angle at which each sub-beam reaches the laser dissipation area improves the dissipation efficiency of the laser dissipation area, allowing more light energy to be effectively utilized. Maintaining a certain gap reduces interference between adjacent sub-beams, avoiding unnecessary light energy loss, and dissipates heat, preventing localized overheating.

[0113] In this embodiment, the first surface of the single-sided compound eye element faces the light combining element. The second excitation generated by the light source assembly passes through the light combining element and the single-sided compound eye element to reach the laser dissipation zone of the wavelength conversion device. The laser dissipation zone dissipates the second laser to form a third laser. The third laser passes through the single-sided compound eye element again and is reflected by the light combining element, and then exits in the same direction as the received and excitation light described in the above example. It should be noted that the supplementary laser can pass through the single-sided compound eye element twice and exit from the first surface of the single-sided compound eye element. The beams exiting through each sub-eye are focused at the apex of each sub-eye. In this way, the uniform light effect of a double-sided compound eye can be achieved through a single-sided compound eye. It is not necessary to control the eccentricity and tilt of the two surfaces of the double-sided compound eye, which can greatly reduce the processing difficulty and thus significantly reduce the cost.

[0114] In some embodiments, refer to Figure 5 and Figure 6 As shown, the light source assembly includes one or more of a first light source 11, a second light source 12, and a first light guiding assembly 13. The first light source 11 is used to generate a first laser, or to generate at least two types of lasers; the second light source 12 is used to generate a second laser or supplementary light to the first laser.

[0115] The light-emitting side of the first light source 11 is located on the side of the light combining component away from the wavelength conversion device 2. The first laser of the first polarization state generated by the first light source 11 is incident on the wavelength conversion region 21 through the first beam splitting element 31. The optical axis of the first laser is parallel to the optical axis of the laser being irradiated.

[0116] The light-emitting side of the second light source 12 is located on the side of the laser dissipation zone 22 away from the light combining component. The second laser generated by the second light source 12 passes through the laser dissipation zone 22 and reaches the light combining element 32, where it is combined with the received laser. Alternatively, the light-emitting side of the second light source 12 is located on the side of the first light guiding component 13 away from the laser dissipation zone 22. The supplementary light of the first laser with the second polarization state generated by the second light source 12 is guided by the first light guiding component 13 to the laser dissipation zone 22 for dissipation, and then guided by the first light guiding component 13 to the light combining component, where it is combined with the received laser and the third laser for emission.

[0117] In this embodiment, the light-emitting side of the first light source can be located on the side of the light-combining component away from the wavelength conversion device. The first light source can generate a laser with a preset polarization state, i.e., a first laser, which can be a blue laser. Thus, by generating a laser with a specific first polarization state, unnecessary light loss can be reduced, ensuring that more light energy is effectively utilized in the display process, thereby reducing energy consumption and improving the overall system energy efficiency. The first light source can also generate a second laser, which can be one or more of red, green, and blue lasers. It should be noted that the laser generated by the first light source may or may not have a polarization state.

[0118] In this embodiment, the light-emitting side of the second light source can be located on the side of the laser dissipation region away from the light-combining component. The second light source can generate one or more of red, green, and blue lasers. Alternatively, the light-emitting side of the second light source can also be located on the side of the first light-guiding component away from the laser dissipation region. The laser generated by the second light source can serve as supplementary light to the excitation light, thereby improving brightness and color gamut. It should be noted that the laser generated by the second light source can have a polarization state, preferably an S-state, but may also not have a polarization state.

[0119] In one embodiment of this application, the light source assembly includes a first light source and a second light source. The first light source is used to generate a first laser, such as a blue laser, as excitation light, and the second light source is used to generate a second laser, such as a red laser, a red laser, and a blue laser, or a tri-color laser, as supplementary light. The light-emitting side of the first light source is located on the side of the light-combining assembly away from the wavelength conversion device, and the light-emitting side of the second light source is located on the side of the laser dissipation region away from the light-combining assembly. That is, the first light source and the second light source are located on opposite sides of the wavelength conversion device. For example, continuing to refer to... Figure 5 .

[0120] Here, the first laser beam generated by the first light source, i.e., the excitation light, is incident on the wavelength conversion region and the reflection region through the first beam-splitting element in a time-division manner. The wavelength conversion region absorbs the excitation light and emits the received laser beam, and the optical axis of the excitation light is parallel to or does not coincide with the optical axis of the received laser beam. The received laser beam is reflected by the first beam-splitting element and transmitted through the beam-combining element before being emitted. The second laser beam generated by the second light source, i.e., the supplementary light, undergoes dissipation processing in the transmission-type laser dissipation region. After dissipation processing, the supplementary light is reflected by the beam-combining element and emitted in the same direction as the received laser beam. For example, refer to... Figure 5 The left image shows the laser beam. Of course, the received laser beam can also be reflected by the first beam-splitting element and then by the beam-combining element before being emitted. The supplementary light, after being dissipated, is transmitted through the beam-combining element and emitted in the same direction as the received laser beam. For example, refer to... Figure 5 The right image in the text.

[0121] As described above, lasers with different effects are generated by light sources located on different sides of the wavelength conversion device, achieving combined light emission. First, the first laser (excitation light) generated by the first light source is guided to the wavelength conversion region and the reflection region in a time-division manner by the first beam splitter, realizing flexible allocation of the optical path. The wavelength conversion region can efficiently absorb the excitation light and convert it into the received laser. The received laser is reflected by the first beam splitter and transmitted by the beam combiner before being emitted, ensuring full utilization of the received laser. Then, since the optical axis of the excitation light is parallel to the optical axis of the received laser, the spatial layout of the entire system is more compact, the volume is smaller, and it is easier to integrate into other devices. The parallelism of the optical axes of the excitation light and the received laser reduces the complexity of the alignment process, making the system easier to debug and maintain. The second laser (supplementary light) generated by the second light source is processed by the laser dissipation region and emitted in the same direction as the received laser through the beam combiner, realizing the mixing and adjustment of light colors and producing a richer and more uniform light color effect.

[0122] In another embodiment of this application, the light source assembly includes a first light source for generating a three-color laser. The three-color laser includes a first laser, such as a blue laser, as excitation light, and one or more of a second laser, such as a red laser, a green laser, and a blue laser, as supplementary light. The light-emitting side of the first light source is located on the side of the light-combining assembly away from the wavelength conversion device. For example, refer to... Figure 6 The left image in the image.

[0123] Here, for the first laser, the first laser generated by the first light source is the excitation light, which is incident into the wavelength conversion region through the first beam splitting element in a time-division manner. The wavelength conversion region absorbs the excitation light and emits the received laser, and the optical axis of the excitation light is parallel to the optical axis of the received laser. The received laser is reflected by the first beam splitting element and transmitted by the beam combining element before being emitted.

[0124] Here, regarding the second laser, since the laser dissipation region can be either transmissive or reflective, and assuming the light sources generating the first and second lasers are located on the same side of the wavelength conversion device, this can be achieved in the following way:

[0125] In Method 1, the laser extinction zone is reflective, and the beam combining assembly also includes a polarization conversion element positioned between the beam combining element and the laser extinction zone of the wavelength conversion device. This polarization conversion element can be a phase difference element, such as a quarter-wave plate. The beam combining element transmits (or reflects) the received laser light and light of the second polarization state, and reflects (or transmits) light of the first polarization state. Specifically, the second laser light of the second polarization state generated by the first light source, i.e., the supplementary light, is transmitted through the beam combining element. The polarization conversion element is then incident on the reflective laser extinction zone, which dissipates and reflects the supplementary light. The dissipated supplementary light then passes through the polarization conversion element again. Because it passes through the polarization conversion element twice, the polarization state of the second laser light changes from the second polarization state to the first polarization state. After being reflected by the beam combining element, the second laser light of the first polarization state exits in the same direction as the received laser light. Thus, by adding a polarization conversion element between the beam combining element and the laser extinction zone, and by changing the polarization state of the second laser light using the polarization conversion element, it is ensured that excitation light of different polarization states can be effectively separated and combined, thereby improving the utilization rate of the excitation light and ultimately improving the overall system's optical efficiency.

[0126] In method two, the laser dissipation zone is transmissive. The beam combining component further includes a polarization conversion element and an optical path reversal element. The polarization conversion element and optical path reversal element are positioned on the side of the transmissive laser dissipation zone relatively far from the beam combining element. The polarization conversion element is positioned between the laser dissipation zone and the optical path reversal element. The polarization conversion element can be a phase difference element, such as a quarter-wave plate. The optical path reversal element can be a planar reflective element or a curved reflective element. The curved surface of the curved reflective element can face the laser dissipation zone, allowing it to focus the second laser beam on its curved surface, thus facilitating the second laser beam to pass through the laser dissipation zone again for dissipation. The beam combining element transmits (or reflects) the laser beam and the light with the second polarization state, and reflects (or transmits) the light with the first polarization state.

[0127] Furthermore, the second laser beam with the second polarization state emitted from the first light source, i.e., the supplementary light such as red laser or tri-color laser, illuminates the transmission-type laser dissipation region of the wavelength conversion device. After dissipation and transmission, the second laser beam undergoes phase delay by the polarization conversion element and reflection by the optical path reversal element, and then undergoes phase difference delay again by the polarization conversion element. It should be noted that because the second laser beam passes through the polarization conversion element twice, its polarization state changes from the second polarization state to the first polarization state, thus obtaining the second laser beam with the second polarization state. The second laser beam with the second polarization state is then transmitted through the laser dissipation region again, reaches the beam combining element, and is reflected, and then combined with the received laser beam and the first laser beam in the same direction before being emitted. Thus, a polarization conversion element and an optical path reversal element are sequentially added in the direction of the optical path from which the second laser is transmitted in the laser dissipation region of the wavelength conversion device. The second laser with the second polarization state passes through the polarization conversion element and the optical path reversal element. By using the polarization conversion element to change the polarization state of the excitation light, it is ensured that excitation light with different polarization states can be effectively separated and combined. By using the optical path reversal element, it is ensured that the second laser returns along the original optical path. In this way, the utilization rate of the excitation light and the optical efficiency of the entire system are improved.

[0128] It should be noted that the light sources for generating the first and second lasers are located on the same side of the wavelength conversion device, the laser dissipation zone can be transmissive or reflective, and the operation of combining the second laser with the received laser is also applicable to other embodiments in this application.

[0129] As described above, lasers with different effects are generated by the same light source located on the same side of the wavelength conversion device, achieving combined light emission. First, the first laser (excitation light) generated by the first light source is guided to the wavelength conversion region and the reflection region in a time-division manner by the first beam splitter, realizing flexible allocation of the optical path. The wavelength conversion region can efficiently absorb the excitation light and convert it into the received laser. The received laser is reflected by the first beam splitter and transmitted by the beam combiner before being emitted, ensuring full utilization of the received laser. Then, since the optical axis of the excitation light is parallel to the optical axis of the received laser, the spatial layout of the entire system is more compact, the volume is smaller, and it is easier to integrate into other devices. The parallelism of the optical axes of the excitation light and the received laser reduces the complexity of the alignment process, making the system easier to debug and maintain. The second laser (supplementary light) generated by the first light source is processed by the laser dissipation region and emitted in the same direction as the received laser through the beam combiner, realizing the mixing and adjustment of light colors and producing a richer and more uniform light color effect.

[0130] In some embodiments, continue to refer to Figure 6 As shown, the first light guiding component 13 includes a second beam splitter 131 and a third phase difference element 132. The second beam splitter 131 transmits light of the first polarization state and reflects light of the second polarization state.

[0131] In another embodiment of this application, the light source assembly includes a first light source, a second light source, and a first light guiding assembly. The first light source can be used to generate a three-color laser, including a first laser such as a blue laser as excitation light, and a second laser such as a red laser and a green laser as supplementary light. The second light source is used to generate a second laser, such as a blue laser, as supplementary light for the first laser. The light-emitting side of the first light source is located on the side of the light combining assembly away from the wavelength conversion device, and the light-emitting side of the second light source is located on the side of the first light guiding assembly away from the laser dissipation region. It should be noted that the laser dissipation region used to dissipate the supplementary light of the first laser generated by the second light source, and the laser dissipation region used to dissipate the first laser and / or the second laser generated by the first light source, are located in different regions of the wavelength conversion device. For example, refer to... Figure 6 The right image in the text.

[0132] Here, the first laser beam generated by the first light source, i.e., the excitation light, is incident on the wavelength conversion region and the reflection region through the first beam splitter. The wavelength conversion region absorbs the excitation light and emits the received laser beam, with the optical axis of the excitation light parallel to the optical axis of the received laser beam. The received laser beam is reflected by the first beam splitter and transmitted through the beam combiner before being emitted. The second laser beam generated by the first light source, i.e., the supplementary light, is transmitted through the beam combiner to the reflective laser dissipation region. The laser dissipation region dissipates and reflects the supplementary light, which is then reflected and emitted after reaching the beam combiner.

[0133] Furthermore, the second laser light of the first polarization state generated by the second light source, i.e., the supplementary light of the first laser, is guided to the reflective laser dissipation region after being transmitted through the second beam splitter in the first light guiding component and delayed by the phase difference of the third phase difference element. After dissipation and reflection, it passes through the third phase difference element again. Because the supplementary light of the first laser passes through the third phase difference element (such as a quarter-wave plate) twice, the polarization state of the supplementary light of the first laser changes from the first polarization state to the second polarization state, thus obtaining the second polarization state supplementary light of the first laser light after dissipation processing. Further, the second polarization state supplementary light of the first laser light after dissipation processing is reflected by the second beam splitter, transmitted through the first beam splitter, and transmitted through the beam combiner, and then combined with the received laser light and the dissipated supplementary light before being emitted.

[0134] As described above, lasers with different effects are generated by different light sources located on the same side of the wavelength conversion device, achieving beam combining and emission. First, the first laser (excitation light) generated by the first light source can be guided, in whole or in part, to the wavelength conversion region and the reflection region through a first beam-splitting element, achieving flexible allocation of the optical path. The wavelength conversion region can efficiently absorb the excitation light and convert it into received laser light. The received laser light is reflected by the first beam-splitting element and transmitted through the beam-combining element before being emitted, ensuring full utilization of the received laser light. Second, because the optical axis of the excitation light is parallel to the optical axis of the received laser light, the spatial layout of the entire system is more compact, the volume is smaller, and it is easier to integrate into other devices. The parallelism of the optical axes of the excitation light and the received laser light reduces the complexity of the alignment process, making the system easier to debug and maintain. Then, the second laser (supplementary light) generated by the first light source is processed by the laser dissipation zone and guided to the light combining element. Finally, since the excitation light generated by the first light source may be used entirely to excite fluorescence, by adding a second light source, supplementary light of the excitation light can be generated. After being guided by the first light guiding component and the light combining component, it is emitted in the same direction as the laser and the supplementary light that has been dissipated, through the light combining element, realizing the mixing and adjustment of light color and producing a richer and more uniform light color effect.

[0135] In some embodiments, refer to Figure 7 As shown, the light source assembly includes a third light source 14 and a second light guiding assembly 15 (not shown in the figure). The second light guiding assembly 15 includes a first light path separating element 151, a first laser beam that transmits, and a first laser beam that reflects; or a first laser beam that reflects.

[0136] The first laser beam in the first polarization state generated by the third light source 14 is partially reflected / or transmitted by the first optical path separation element 151, and is guided to the wavelength conversion region 21 by the second optical guiding component 15 at most.

[0137] The first laser in the first polarization state generated by the third light source 14 is partially transmitted / or reflected by the first optical path separation element 151, and then guided to the laser dissipation region 22 by the second optical guiding component 15 at most.

[0138] In this embodiment, the light source assembly includes a third light source and a second light guiding assembly. The third light source is used to generate three-color lasers, including a first laser, such as a blue laser, as the excitation light, and a second laser, such as a partial blue laser, a red laser, and / or a green laser, as supplementary light. The light-emitting side of the third light source is located on the side of the light combining assembly away from the wavelength conversion device. Exemplarily, the three-color lasers are arranged from left to right as blue laser, red laser, and green laser. Of course, the order of the three-color lasers can also be other, requiring adjustment of the thin-film characteristics of some or all of the elements included in the second light guiding assembly according to the order of the three-color lasers.

[0139] In this embodiment, the first optical path separating element can transmit a portion of the first laser light and reflect a portion of the first laser light. The first optical path separating element can also reflect a second laser light. Of course, the first optical path separating element can also reflect both the first and second laser lights; that is, the first optical path separating element reflects all light. For example, the first optical path separating element can be a reflective element.

[0140] In this embodiment, the first laser light generated by the third light source, such as excitation light, is partially reflected by the first optical path separating element, guided by a portion of the elements in the second optical guiding component, and transmitted through the first beam splitting element to reach the wavelength conversion region or reflection region. The wavelength conversion region absorbs part or all of the excitation light and emits the received laser light; the reflection region reflects the excitation light. The received laser light is reflected by the first beam splitting element and transmitted through the beam combining element before being emitted. The first laser light generated by the third light source, such as excitation light, is partially transmitted by the first optical path separating element, and the second laser light generated by the third light source is guided by a portion of the elements in the second optical guiding component to the first optical path separating element, which reflects the second laser light. The reflected second laser light and a portion of the excitation light are transmitted through the beam combining element to reach the reflective laser dissipation region. The second laser light and a portion of the first laser light are dissipated and reflected by the laser dissipation region, and then reflected by the beam combining element before being emitted in the same direction as the received laser light.

[0141] Therefore, this light source device can efficiently process two different lasers (the first laser and the second laser) from the same light source (i.e., the third light source). Through the first optical path separation element, the device can split the first laser beam. In this way, a portion of the laser beam can be used as excitation light to excite fluorescence, while the remaining portion, along with other lasers of different colors, can be used as supplementary light for beam combining. This greatly enhances the system's versatility and flexibility, and significantly improves the overall light energy utilization rate.

[0142] In some embodiments, continue to refer to Figure 7 The second optical guiding assembly includes a first optical path separating element 151, a fourth beam splitting element 152, a fifth reflective element 153, and a sixth reflective element 154, wherein,

[0143] The centers of the first optical path separating element 151, the fourth beam splitting element 152, the fifth reflective element 153, and the sixth reflective element 154 can be located at the same level. The first optical path separating element 151 and the fourth beam splitting element 152 are located between the fifth reflective element 153 and the sixth reflective element 154. The first optical path separating element 151 can be located on the optical path of the blue laser generated by the third light source.

[0144] The fourth beam splitter 152 transmits or reflects red laser light and reflects or transmits green laser light.

[0145] In this embodiment, the laser colors generated by the third light source in the laser sequence can be blue laser, red laser, and green laser; of course, the laser colors generated by the third light source in the laser sequence can be blue laser, green laser, and red laser, or other sequences of lasers. The thin film characteristics and positions of the elements contained in the second light guiding component corresponding to different sequences of lasers need to be adjusted accordingly.

[0146] In this embodiment, the fourth beam splitter can transmit red laser light and reflect green laser light, or reflect red laser light and transmit green laser light. The thin film characteristics of the fourth beam splitter can be determined based on the positions of the red and green laser light generated by the third light source.

[0147] In this embodiment, a portion of the first laser, such as a blue laser, generated by the third light source is used as excitation light. It is reflected by the first optical path separating element and guided to the sixth reflecting element. After being reflected again by the sixth reflecting element and transmitted through the first beam splitting element, it is guided to the wavelength conversion region. The wavelength conversion region absorbs the blue laser and emits the received laser. The received laser is reflected by the first beam splitting element and transmitted through the beam combining element before being emitted. The remaining portion of the first laser, such as a blue laser, generated by the third light source serves as supplementary light. It is transmitted through the first optical path splitter and then through the beam combiner to reach the reflective laser dissipation region. The second laser, such as a red laser, generated by the third light source serves as supplementary light. It is reflected by the fourth beam splitter and the first optical path splitter, then transmitted through the beam combiner to reach the reflective laser dissipation region. The second laser, such as a green laser, generated by the third light source serves as supplementary light. It is reflected by the fifth reflector, transmitted through the fourth beam splitter and the first optical path splitter, then transmitted through the beam combiner to reach the reflective laser dissipation region. Furthermore, the blue, red, and green lasers, which serve as supplementary light, are dissipated and reflected after passing through the laser dissipation region. They are then reflected by the beam combiner and combined with the received laser emitted from the beam combiner in the same direction before being emitted.

[0148] As described above, this light source device can efficiently process two different lasers (the first laser and the second laser) from the same light source (i.e., the third light source). Through the first optical path separation element, the device can split the first laser beam. In this way, a portion of the laser can be used as excitation light to excite fluorescence, while the remaining portion, along with other lasers of different colors, can be combined as supplementary light. Furthermore, through the design and coordination of the optical elements, the remaining portion and other lasers of different colors can be combined with the received laser for emission. This greatly enhances the system's versatility and flexibility, and significantly improves the overall light energy utilization rate.

[0149] In some embodiments, refer to Figure 8As shown, the light combining assembly also includes a first phase difference element 33, which is located between the first beam splitting element 31 and the wavelength conversion region 21; the light source assembly includes a third light source 14 and a second light guiding assembly 15 (not shown in the figure), the second light guiding assembly including a first optical path separating element 151, a fourth beam splitting element 152, a sixth beam splitting element 158, a sixth reflective element 154, a seventh reflective element 155, a fifth beam splitting element 156 and a diffusion element 157;

[0150] Among them, the centers of the first optical path separating element 151, the fourth beam splitting element 152, the sixth beam splitting element 158, the sixth reflective element 154, the seventh reflective element 155 and the diffusion element 157 can be located at the same level. The first optical path separating element 151, the fourth beam splitting element 152, the sixth beam splitting element 158 ​​and the diffusion element 157 are located between the sixth reflective element 154 and the seventh reflective element 155. The diffusion element 157 is located between the sixth reflective element 154 and the first optical path separating element 151. The fifth beam splitting element is set on the output optical path of the beam combining element 32. The first optical path separating element 151 can be located on the optical path of the blue laser generated by the third light source.

[0151] Among them, the thin film characteristics of the first optical path separation element 151 are such that the second surface opposite to the light-emitting side of the third light source reflects the first polarization state and transmits the second polarization state; the third surface opposite to the second surface reflects the second laser and transmits the first laser.

[0152] Among them, the fourth beam splitter 152 transmits blue laser, transmits or reflects red laser, and reflects or transmits green laser.

[0153] Among them, the fifth beam splitter 156 reflects blue laser light and transmits other light;

[0154] The sixth beam splitter, 158, reflects red or green laser light and transmits blue laser light.

[0155] In this embodiment, the laser colors generated by the third light source in the laser sequence can be blue laser, red laser, and green laser; of course, the laser colors generated by the third light source in the laser sequence can be blue laser, green laser, and red laser, or other sequences of lasers. The thin film characteristics and positions of the elements contained in the second light guiding component corresponding to different sequences of lasers need to be adjusted accordingly.

[0156] In this embodiment, the length of the fourth phase difference element is less than the circumference width of the wavelength conversion region, and the fourth phase difference element does not at least partially cover the reflection region of the wavelength conversion device.

[0157] In this embodiment, the fourth beam splitter can transmit red and blue lasers and reflect green lasers; or, transmit green and blue lasers and reflect red lasers. The thin film characteristics of the fourth beam splitter are determined based on the positions of the red and green lasers generated by the third light source.

[0158] In this embodiment of the application, the fifth beam splitter can reflect blue light and transmit other light; or transmit blue light and reflect other light.

[0159] In this embodiment, the sixth beam splitter reflects red or green laser light and transmits blue laser light.

[0160] In this embodiment, when the wavelength conversion device includes a reflection zone, a portion of the first laser light, such as blue laser light, with a first polarization state generated by the third light source is used as excitation light. After being reflected by the first optical path separating element and dissipated by the diffusion element, it is guided to the sixth reflection element. After reflection by the sixth reflection element, transmission by the first beam splitter element, and phase delay by the first phase difference element (such as a quarter-wave plate), it is guided to the wavelength conversion zone or reflection zone. The wavelength conversion zone absorbs the excitation light (blue laser light) and emits the received laser light and the residual first laser light (residual excitation light). The reflection zone reflects the excitation light. The received laser light is reflected by the first beam splitter element and transmitted by the beam combining element before being emitted. The residual first excitation light is again delayed by the phase difference of the first phase difference element (such as a quarter-wave plate), changing its polarization state from the first to the second. The residual excitation light in the second polarization state is reflected by the first beam splitter element and re-enters the wavelength conversion zone, thereby achieving the recovery of the residual laser light. Furthermore, the excitation light reflected from the reflection zone is transmitted through the first beam splitter, reflected again by the sixth reflector, dissipated by the diffusion element, and transmitted through the first optical path separating element, the fourth beam splitter, and the sixth beam splitter before reaching the seventh reflector. The excitation light of the second polarization state is reflected by the seventh reflector and then reflected out by the fifth beam splitter. The second laser generated by the third source, such as a red laser, serves as supplementary light. It is reflected by the fourth beam splitter and the first optical path separating element, transmitted through the beam combining element, and reaches the reflective laser dissipation zone. The second laser generated by the third source, such as a green laser, serves as supplementary light. It is reflected by the sixth beam splitter, transmitted through the fourth beam splitter, reflected by the first optical path separating element, transmitted through the beam combining element, and reaches the reflective laser dissipation zone. Furthermore, the red and green lasers, as supplementary light, are dissipated and reflected in the laser dissipation zone, reflected by the beam combining element, and transmitted out by the fifth beam splitter, where they are combined with the received laser and the first laser of the second polarization state in the same direction before being emitted.

[0161] As described above, during the periodic movement of the wavelength conversion device, the wavelength conversion region and the reflection region can periodically occupy the optical path of the first laser. When the wavelength conversion region is located on the optical path of the first laser, the first laser can be used as excitation light to excite fluorescence. Since the wavelength conversion region may not completely absorb the first laser, there is residual laser. At this time, the first laser that was not completely absorbed by the wavelength conversion region (residual first laser) undergoes polarization state conversion and is redirected back to the wavelength conversion region by the first beam splitting element for re-conversion. In this way, by recovering unused excitation light, the overall light energy conversion efficiency is improved; at the same time, it reduces the light energy that is converted into heat due to ineffective utilization, which helps the system's heat dissipation and stability. Furthermore, when the reflection region is located on the optical path of the first laser, since the fourth phase difference element is at least partially not covered on the reflection region of the wavelength conversion device, the first laser can be used as supplementary light and guided by the second light guiding component and the light combining component to combine with the laser and other supplementary lights of other colors for emission, improving the light conversion efficiency while ensuring the high color gamut and high brightness of the projection system.

[0162] In some embodiments, refer to Figure 9 As shown, the light source assembly includes a fourth light source 16, and the light combining assembly 3 also includes a second reflective element 36 with a through hole, the second reflective element 36 being disposed between the fourth light source 16 and the first light splitting element 31;

[0163] The light-emitting side of the fourth light source 16 is located on the side of the first beam splitting element 31 away from the wavelength conversion device 2. The first laser generated by the fourth light source 16 passes through the through hole of the second reflective element 36 and the first beam splitting element 31 and is incident on the wavelength conversion region 21 to generate the laser and the residual first laser.

[0164] The laser beam is reflected by the first beam splitter 31, transmitted or reflected by the beam combining element 32, and the residual first laser beam is transmitted through the first beam splitter 31 and reflected by the second reflector 36 and re-entered into the wavelength conversion region 21 for laser recycling.

[0165] In this embodiment, the first laser generated by the fourth light source can be a blue laser.

[0166] In this embodiment, the size of the through hole of the second reflective element can be set based on actual experience to allow the first laser generated by the fourth light source to pass through. It should be noted that after the first laser is reflected by the wavelength conversion region, it diffuses and the light spot becomes larger, that is, the light spot of the residual first laser becomes larger. When the residual first laser irradiates the first reflective element, the residual first laser that has lost the transmission area of ​​the first reflective element, and the residual first laser reflected by the reflection areas on both sides of the transmission area of ​​the first reflective element, irradiate the wavelength conversion region again to re-excite and generate the laser.

[0167] In this embodiment, the first laser light generated by the fourth light source, such as blue laser light, is used as the excitation light. It passes through the through-hole of the second reflective element and the first beam-splitting element, and is incident on the wavelength conversion region to generate the received laser light. Since the wavelength conversion region may not completely absorb the first laser light, residual first laser light may remain. Alternatively, if the wavelength conversion device includes a reflective area with diffusion properties, during the periodic movement of the wavelength conversion device, the first laser light is incident on the reflective area and reflected, forming the fourth laser light. The received laser light is reflected by the first beam-splitting element, transmitted by the beam-combining element, or reflected out. Residual first and / or fourth laser light is transmitted through the first beam-splitting element and reflected by other areas of the second reflective element (excluding the through-hole), and then re-incidentally incident on the wavelength conversion region for laser recovery and reuse.

[0168] As can be seen from the above, in this embodiment of the application, the first laser that is not completely absorbed by the wavelength conversion region (the residual first laser) and the first laser that may be reflected back by the reflection region (the fourth laser) will be redirected back to the wavelength conversion region for conversion again. In this way, by recovering the unused excitation light, the overall light energy conversion efficiency is improved; at the same time, the light energy that is converted into heat energy due to ineffective utilization is reduced, which helps the system's heat dissipation and stability.

[0169] In some embodiments, continue to refer to Figure 9 The light source assembly also includes a seventh light source 161, the light-emitting side of which is located on the side of the laser dissipation zone 22 away from the light combining assembly, and the seventh light source 161 is used to generate a second laser.

[0170] In this embodiment, the second laser generated by the seventh light source can serve as supplementary light, and the seventh light source can generate red laser or tri-color laser.

[0171] In this embodiment, the second laser generated by the seventh light source, such as a red laser or a tri-color laser, serves as supplementary light. This supplementary light undergoes dissipation processing in the transmission-type laser dissipation zone of the wavelength conversion device, resulting in dissipated supplementary light. This dissipated supplementary light is then reflected or transmitted by the light-combining element and combined with the received laser light in the same direction before being emitted. Thus, by utilizing the mixing mode of the dissipated supplementary laser and fluorescence, the high color gamut and high brightness requirements of the projection system are achieved, while simultaneously eliminating laser speckle and color fringing ghosting phenomena, improving the quality of the projected image, and ultimately enhancing the user's viewing experience.

[0172] In some embodiments, refer to Figure 10As shown, the wavelength conversion device 2 includes a reflection area 23 located in the optical path of the first laser. The light source assembly includes a fifth light source 17, and the light combining assembly also includes a third light guiding assembly 37 (not shown in the figure). The third light guiding assembly 37 includes a seventh beam splitting element 371, multiple third reflective elements 372, and a fourth phase difference element 373. The first beam splitting element 31 is a moving element; the multiple third reflective elements 372 are arranged around the wavelength conversion device 2.

[0173] The first beam splitter 31 has a transmission part for the first laser beam, a reflection part for the first laser beam and a receiving part for the laser beam, which transmits light of the first polarization state and reflects light of the second polarization state.

[0174] The seventh beam splitter 371 transmits the first laser beam and reflects the second laser beam;

[0175] The third reflecting element 372 reflects all light;

[0176] Among them, a portion of the first laser in the first polarization state generated by the fifth light source 17 is transmitted through the first beam splitting element 31 and the fourth phase difference element 373, and then irradiates the wavelength conversion region 21 or the reflection region 23 to generate the received laser and the fourth laser. The received laser and the fourth laser are then reflected again by the fourth phase difference element 374, the first beam splitting element 31, and the beam combining element 32.

[0177] A portion of the first laser generated by the fifth light source 17 is reflected by the first beam splitter 31, transmitted through the seventh beam splitter 371, and then, together with the second laser generated by the fifth light source 17, is reflected by multiple third reflectors 372, dissipated by the laser dissipation zone 22, transmitted through the beam combining element 32, and then combined with the received laser and the fourth laser before being emitted.

[0178] In this embodiment, the laser colors generated by the fifth light source in the laser sequence can be red, green, and blue lasers; of course, the laser colors generated by the fifth light source in the laser sequence can be green, red, and blue lasers, or other sequences of lasers. The thin film characteristics and positions of the elements contained in the third light guiding component corresponding to different sequences of lasers need to be adjusted accordingly.

[0179] In this embodiment, the first beam splitter can be a moving element, such as a movable element. This allows the first beam splitter to be configured according to user requirements, such as whether it's a three-color laser mode or a mixing mode of three-color laser and fluorescence. Alternatively, the first beam splitter can also rotate or oscillate periodically. This allows for periodic changes in the configuration of the first beam splitter according to user requirements, such as a three-color laser mode and a mixing mode of three-color laser and fluorescence. This application does not impose specific limitations on this aspect.

[0180] In the embodiments of this application, the first beam splitter can be a beam splitter element, such as a first laser beam that transmits, a first laser beam that reflects, and a laser beam that receives; of course, the first beam splitter element can be a polarizing element, such as one that can transmit light of a first polarization state and reflect light of a second polarization state; of course, the first beam splitter element can be a reflecting element, such as one that can reflect all light; of course, the first beam splitter element can also be an element with one or more of the above features, and this application does not impose specific limitations on this.

[0181] In this embodiment, the light combining element can transmit the second laser and reflect the first laser, or transmit the first laser and reflect the second laser; of course, the light combining element can also transmit light of the first polarization state and reflect light of the second polarization state, and this application does not impose specific limitations on this.

[0182] In this embodiment, multiple third reflective elements are used to change the direction of light transmission, causing it to converge or diverge. The third reflective elements can be placed at an angle so that the reflected laser light irradiates along a preset optical path direction. The third reflective elements can be curved reflectors or flat reflectors.

[0183] In this embodiment, the fourth phase difference element is used to change the polarization state of light. The fourth phase difference element can be a waveplate, which includes a half-wave plate (1 / 2 waveplate or λ / 2) and a quarter-wave plate (1 / 4 waveplate or λ / 4), which are used to generate phase delays of π and π / 2, respectively.

[0184] In this embodiment, the seventh beam splitter can transmit the first laser and reflect the second laser.

[0185] In this embodiment, the wavelength conversion device further includes a reflection region disposed between the wavelength conversion regions. The wavelength conversion device moves periodically so that the wavelength conversion region and the reflection region are periodically positioned on the optical path of the first laser. The first laser is incident on the surface of the reflection region and reflected to form a fourth laser. It should be noted that the radial width of the reflection region extending to the center is greater than or equal to the radial width of the wavelength conversion region extending to the center. This ensures that more of the first laser can completely irradiate the reflection region, thereby improving the optical conversion efficiency.

[0186] In one embodiment of this application, the fifth light source can generate three-color lasers. To obtain the three-color lasers after dissipation processing, the first beam-splitting element can be a reflective element. In this case, the first laser of the first polarization state, such as a blue laser, generated by the fifth light source is reflected by the first beam-splitting element and transmitted through the seventh beam-splitting element to the first third reflective element; the second laser of the fifth light source, such as a red laser and a green laser, is also reflected by the seventh beam-splitting element and guided to the first third reflective element. Then, the first and second lasers are reflected by the first third reflective element, dissipated by the laser dissipation zone of the wavelength conversion device, and then reflected sequentially by two third reflective elements to reach the beam-combining element. The beam-combining element transmits or reflects the first and second lasers of the first polarization state and then combines them in the same direction for emission. Thus, by using an integrated wavelength conversion device and the laser dissipation zone on the wavelength conversion device, the dissipation of the three-color lasers is achieved, reducing the system size and lowering the cost.

[0187] In another embodiment of this application, the fifth light source can generate three-color lasers. To achieve laser dissipation and fluorescence mixing, the first beam splitter can be a beam splitter. In this case, part or all of the first laser of the first polarization state, such as blue laser, generated by the fifth light source is transmitted through the first beam splitter and the fourth phase difference element, illuminating the wavelength conversion region or reflection region to generate a received laser and a fourth laser of the first polarization state. The received laser then passes through the fourth phase difference element, is reflected by the first beam splitter, and is reflected or transmitted out by the combining element. The fourth laser of the first polarization state then passes through the fourth phase difference element, such as a quarter-wave plate. Due to passing through the phase difference element twice, the fourth laser changes from the first polarization state to the second polarization state. The fourth laser of the second polarization state is reflected by the first beam splitter and reflected or transmitted out by the combining element. Further, a portion of the first laser of the fifth light source, such as blue laser, serves as supplementary light, is reflected by the first beam splitter, transmitted through the seventh beam splitter, and guided to the first third reflecting element. The second laser of the fifth light source, such as red and green lasers, is also guided to the first third reflecting element after being reflected by the seventh beam splitter. At this point, a portion of the first and second lasers in their first polarization states are reflected by the first third reflecting element. After being dissipated by the laser dissipation zone of the wavelength conversion device, they are reflected sequentially by two third reflecting elements to reach the beam combining element. The beam combining element transmits or reflects the first and second lasers in their first polarization states, and then combines them with the first laser in its second polarization state and the received laser in the same direction for emission. Thus, by using an integrated wavelength conversion device and phase difference element, and through the laser dissipation zone and fluorescence zone on the wavelength conversion device, laser dissipation and fluorescence excitation are achieved, reducing system size and cost. Furthermore, by utilizing the mixing mode of the three-color laser and fluorescence, the high color gamut and high brightness requirements of the projection system are met.

[0188] In some embodiments, with Figure 10For example, the light source device also includes a fourth shaping element and a second uniform light element, wherein the fourth shaping element and the second uniform light element are disposed between multiple third reflective elements after passing through the laser dissipation zone.

[0189] In this embodiment, the fourth shaping element and the second homogenizing element are disposed between multiple third reflecting elements, such as between the second and third third reflecting elements. It should be noted that, since the second laser is positioned around the wavelength conversion device and has a relatively long optical path, to avoid scattering in the second laser's optical path, the fourth shaping element and the second homogenizing element are used to homogenize the emitted three-color laser or supplementary light. In this way, the shaping element and homogenizing element can transform the originally uneven light intensity distribution into a uniform light field. Through mechanisms such as scattering, refraction, or reflection, the shaping element and homogenizing element can effectively reduce hot spots (overly bright areas) and dark areas in the light spot, improving visual comfort and image quality, while also reducing light energy loss and improving the overall efficiency of the light source system.

[0190] In some embodiments, refer to Figure 11 As shown, the wavelength conversion device 2 includes a reflection area 23 located in the optical path of the first laser. The light source assembly includes a sixth light source 19, the light-emitting side of which is located on the side of the first beam splitter away from the wavelength conversion device 2. The sixth light source 19 is used to generate the first laser with a first polarization state.

[0191] The light combining component 3 also includes a fourth reflective element 38, which is disposed between the first beam splitting element 31 and the light combining element 32, or, the fourth reflective element 38 is disposed on the side of the light combining element 32 away from the first beam splitting element 31, or, the fourth reflective element 38 is disposed between the light combining element 32 and the wavelength conversion device 2.

[0192] In this process, a first laser beam in a first polarization state is transmitted through a first beam splitter 31 and irradiates a wavelength conversion region 21 to generate a laser beam in a first polarization state and a laser beam in a second polarization state. The laser beam in the first polarization state is reflected by the first beam splitter 31 and transmitted or reflected by the beam combiner 32. The laser beam in the second polarization state is reflected by the first beam splitter 31, reflected or transmitted by the beam combiner 32, reflected by the fourth reflector 38, reflected or transmitted by the beam combiner 32, and reflected by the first beam splitter 31 to a diffuse reflection region 23. After diffuse reflection, it is reflected again by the first beam splitter 31 and reflected or transmitted by the beam combiner 32, and so on, so that the beam combiner 32 emits all the laser beams in the second polarization state. Alternatively, the laser beam in the second polarization state is reflected by the first beam splitter 31 and the fourth reflector 38, and then transmitted through the beam combiner 32 to reach the laser dissipation region 22 or the diffuse reflection region 23. The wavelength ranges of the first laser beam and the laser beams overlap.

[0193] In this embodiment, the sixth light source is used to generate a first laser with a first polarization state. The first laser can be a blue laser as the excitation light to excite the laser-received light.

[0194] In this embodiment, the fourth reflective element can be disposed between the first beam-splitting element and the beam-combining element. For example, the fourth reflective element can be placed horizontally, or it can be disposed on the side of the beam-combining element away from the first beam-splitting element. Alternatively, the fourth reflective element can be placed vertically, allowing some fluorescence to return along its original path and undergo diffuse reflection. This improves the utilization rate of both laser and fluorescence by recovering the fluorescence. Of course, the fourth reflective element can also be disposed between the beam-combining element and the wavelength conversion device. The fourth reflective element can be placed at an angle, allowing some fluorescence to irradiate the reflective laser dissipation region or the diffuse reflection region through a new optical path. This also improves the utilization rate of both laser and fluorescence by recovering the fluorescence.

[0195] In this embodiment, the wavelength range of the first laser and the wavelength range of the laser-received laser partially overlap.

[0196] In this embodiment, the light combining element can transmit light of a first polarization state and reflect light of a second polarization state; or, the light combining element can reflect light of a first polarization state and transmit light of a second polarization state.

[0197] In this embodiment, the wavelength conversion device further includes a reflection region, which can be of a diffused type. The reflection region is disposed between the wavelength conversion regions. The wavelength conversion device moves periodically so that the wavelength conversion region and the reflection region are periodically positioned on the optical path of the first laser. The first laser is incident on the surface of the reflection region and reflected to form a fourth laser. It should be noted that the radial width of the reflection region extending to the center of the circle is greater than or equal to the radial width of the wavelength conversion region extending to the center of the circle. This ensures that more of the first laser can completely irradiate the reflection region, thereby improving the optical conversion efficiency.

[0198] In one embodiment of this application, the wavelength conversion device includes a reflective region, a sixth light source can generate a first laser, such as a blue laser, as excitation light, and a fourth reflective element can be disposed between the first beam-splitting element and the beam-combining element to achieve fluorescence recovery. For example, see... Figure 11The first diagram shows the process. At this point, the first laser beam of the first polarization state, such as blue laser, generated by the sixth light source is transmitted through the first beam splitter and time-divisionally irradiated into the wavelength conversion region and the reflection region to generate a first-polarization received laser beam, a second-polarization received laser beam, and a first-polarization fourth laser beam. The first-polarization received laser beam and the first-polarization fourth laser beam are reflected by the first beam splitter and transmitted through the beam combining element before exiting. The second-polarization received laser beam, after being reflected by the first beam splitter and the beam combining element, reaches the fourth reflecting element. Further, after the fourth reflecting element reflects the second-polarization received laser beam, the second-polarization received laser beam is again reflected by the beam combining element and the first beam splitter, irradiating into the diffuse reflection region located in the inner circle of the wavelength conversion device. After diffuse reflection, it is again reflected by the first beam splitter and transmitted through the beam combining element, thus cycling through the beam combining element to emit part or all of the second-polarization received laser beam. Thus, by setting a fourth reflective element, the fluorescence of the second polarization state can be allowed to return along its original path to the diffuse reflective region for diffuse reflection; thus, by recovering the fluorescence of the second polarization state, the utilization rate of laser and fluorescence is improved.

[0199] In another embodiment of this application, the wavelength conversion device includes a reflective region, and a sixth light source can generate a first laser, such as a blue laser, as excitation light. To achieve fluorescence recovery, a fourth reflective element can be disposed on the side of the combining element away from the first splitting element. For example, see... Figure 11 The second diagram shows the process. At this point, the first laser beam of the first polarization state, such as blue laser, generated by the sixth light source is transmitted through the first beam splitter and time-divisionally irradiated into the wavelength conversion region and the reflection region to generate a first-polarization received laser beam, a second-polarization received laser beam, and a first-polarization fourth laser beam. The first-polarization received laser beam and the first-polarization fourth laser beam are reflected by the first beam splitter and then reflected by the beam combiner before exiting. The second-polarization received laser beam, after being reflected by the first beam splitter and transmitted through the beam combiner, reaches the fourth reflecting element. Further, after the fourth reflecting element reflects the second-polarization received laser beam, the second-polarization received laser beam is again transmitted through the beam combiner and reflected by the first beam splitter, irradiating into the diffused reflection region located in the inner circle of the wavelength conversion device. After diffuse reflection, it is again reflected by the first beam splitter and reflected by the beam combiner before exiting, thus cycling through the beam combiner to emit part or all of the second-polarization received laser beam. Thus, by setting a fourth reflective element, the fluorescence of the second polarization state can be allowed to return along its original path to the diffuse reflective region for diffuse reflection; thus, by recovering the fluorescence of the second polarization state, the utilization rate of laser and fluorescence is improved.

[0200] In another embodiment of this application, the sixth light source can generate a first laser, such as a blue laser, as the excitation light. To achieve fluorescence recovery, a fourth reflective element can be disposed between the light-combining element and the laser diffusion region. For example, refer to... Figure 11The third diagram shows the process. At this point, the first laser beam of the first polarization state, such as blue laser, generated by the sixth light source is transmitted through the first beam splitter and irradiates the wavelength conversion region to generate a first-polarization laser beam and a second-polarization laser beam. The first-polarization laser beam is reflected by the first beam splitter and then reflected by the beam combiner before exiting. The second-polarization laser beam is reflected by the first beam splitter and then transmitted through the beam combiner before reaching the fourth reflecting element. Further, the fourth reflecting element reflects the second-polarization laser beam, which then irradiates the reflective laser diffusion region located on the outer ring of the wavelength conversion device. After diffuse reflection, it is reflected again by the first beam splitter and then by the beam combiner, thus repeating this cycle to allow the beam combiner to emit part or all of the second-polarization laser beam. In this way, by setting up the fourth reflecting element, the second-polarization fluorescence can be irradiated into the reflective laser dissipation region through a new optical path; thus, by recovering the fluorescence, the utilization rate of both laser and fluorescence is improved.

[0201] In another embodiment of this application, the wavelength conversion device includes a reflective region, and a sixth light source can generate a first laser, such as a blue laser, as excitation light. To achieve fluorescence recovery, a fourth reflective element can be disposed between the light-combining element and the laser diffusion region. For example, see... Figure 11 The fourth figure illustrates this. At this point, the first laser beam of the first polarization state, such as blue laser, generated by the sixth light source is transmitted through the first beam splitter and time-divisionally irradiated into the wavelength conversion region and the reflection region to generate a first-polarization received laser beam, a second-polarization received laser beam, and a first-polarization fourth laser beam. The first-polarization received laser beam and the first-polarization fourth laser beam are reflected by the first beam splitter and then reflected by the beam combiner before exiting. The second-polarization received laser beam, after being reflected by the first beam splitter and transmitted through the beam combiner, reaches the fourth reflecting element. Further, the fourth reflecting element reflects the second-polarization received laser beam, thereby irradiating the diffused reflection region located in the inner ring of the wavelength conversion device, or the reflective laser diffusion region located in the outer ring of the wavelength conversion device. After diffuse reflection, it is again reflected by the first beam splitter and then reflected by the beam combiner before exiting, thus cycling to allow the beam combiner to output part or all of the second-polarization received laser beam. In this way, by setting the fourth reflecting element, the second-polarization fluorescence can be irradiated through a new optical path into the reflective laser dissipation region or the diffused reflection region; thus, by recovering the fluorescence, the utilization rate of laser and fluorescence is improved.

[0202] The following describes the implementation process of the embodiments of this application in a feasible application scenario.

[0203] In the projection industry, high brightness and high color gamut have always been pursued in related technologies. However, due to the fact that laser light is linearly polarized, interference will occur, and the light spot is small and the light angle is small, which will cause the projected image to always have speckle problems.

[0204] To address the aforementioned technical problems, this application provides the following integrated wheel-type light-combining device (corresponding to the aforementioned light source device) with different embodiments.

[0205] Example 1

[0206] Reference Figure 12 As shown, the integrated wheel-type light-combining device includes a light source 1201, a light source 1202, a beam splitter 1203, multiple lens groups 1204 and 1205, a wavelength conversion device 1206, reflectors 1207 and 1208, a filter element 1209, a light-diffusing element or shaping lens 1210, a beam splitter 1211, and a light-diffusing element 1212, wherein...

[0207] Light source 1201 is used to generate blue laser light as the excitation light. It should be noted that the blue laser can be polarized, preferably in the P-state.

[0208] Light source 1202 is used to generate red laser or tri-color laser as a supplementary laser. It should be noted that the red laser can be unpolarized or polarized, with the S-state being preferred. The tri-color laser must be polarized or have different dominant wavelengths.

[0209] Beam splitter 1203 is used to transmit blue laser light and reflect fluorescence.

[0210] Multiple lens groups 1204 and 1205 are used to focus or collimate light.

[0211] The wavelength conversion device 1206 includes at least a rotating motor, one or two fluorescent regions, a reflective region, and an extinction region. The fluorescent material in the fluorescent regions can be phosphor, which can produce fluorescence under excitation light (blue laser, blue LED, or UV light). When the wavelength conversion device includes one fluorescent region, the fluorescent material can be green phosphor to produce green fluorescence. When the wavelength conversion device includes two fluorescent regions, the fluorescent materials in the two fluorescent regions are green phosphor and orange phosphor, respectively, thus producing green fluorescence and red fluorescence. The reflective region is located between the fluorescent regions to reflect the blue light of the excitation light; the extinction region can be a reflective or transmissive diffuser, used for laser dissipation. Compound eyes can also be superimposed on the diffuser. Both the fluorescent and extinction regions are arranged in a ring shape, with the fluorescent region on the inner side and the extinction region on the outer side. The wavelength conversion device is also called a fluorescence wheel.

[0212] Reflectors 1207 and 1208 are used to reflect light.

[0213] The filter element 1209 is used to filter green and / or red fluorescence at certain wavelengths to improve the color gamut. The filter is movable, and the filter element can be a movable filter or a color wheel. When the filter element is a color wheel, the motor drives the filters in multiple zones to rotate, keeping synchronized with the integrated wavelength conversion device, to perform time-division filtering of the excited fluorescence.

[0214] The light-diffusing element or shaping lens 1210 is used to uniform or shape light to produce a parallel beam.

[0215] Beam splitter 1211 is used to transmit blue laser and green light (including green laser and green fluorescence) and reflect red light (including red laser and red fluorescence).

[0216] The light homogenizing element 1212 is used to homogenize light and produce a parallel beam of light, which can be used for a double compound eye.

[0217] The specific optical path of this scheme is as follows:

[0218] Fluorescent beam path: The blue laser (which may or may not be in the P-state) is emitted from the light source 1201, transmitted through the beam splitter 1203, focused on the lens group 1204, and then reaches the wavelength conversion device (also known as the phosphor wheel) 1206. The phosphor wheel 1206 has multiple sections and is driven to rotate by a motor, including at least a phosphor region and a blue light reflection region. When the blue laser shines on the phosphor, it excites the phosphor to produce fluorescence. After the fluorescence is shaped by the lens group 1204, it is reflected on the beam splitter 1203 and then filtered by the movable filter element 1209 to improve the color gamut. Next, the fluorescence passes through the beam splitter 1211 and the lens group 1205, is reflected on the reflector 1208, and enters the homogenizing element 1212 to combine with the blue laser.

[0219] Among them, the 1203 coating on the beam splitter has the characteristics of transmitting blue light and reflecting fluorescence.

[0220] The filter element 1209 is movable to obtain more vibrant colors. For example, if green or yellow fluorescence is excited, its color is poor due to its broad spectrum. The filter element 1209 filters out the long wavelengths to obtain a purer green. The filter element 1209 can also filter excited red fluorescence. The filter element 1209 can be removed from the optical path. Without the filter element 1209, the color is poor and the brightness is high; with it, the color is high and the brightness is low. The filter element 1209 can also be a color filter wheel.

[0221] Blue light path: When the blue laser generated by the light source 1201 is transmitted through the beam splitter 1203 and focused on the lens group 1204, it reaches the reflection area of ​​the wavelength conversion device 1206. After being reflected, the blue laser passes through the lens group 1204 and the beam splitter 1203, is reflected on the mirror 1207, and then sequentially passes through the beam splitter 1203, the filter element 1209, the beam splitter 1211, and the lens group 1205 before being reflected on the mirror 1208 and entering the homogenizing element 1212 for beam homogenization. The reflection area can be a mirror or a reflective diffuser, preferably a reflective diffuser.

[0222] Supplementary optical path: The light source 1202 can generate red laser or tri-color laser. After passing through the diffusion area around the phosphor wheel 1206 and being dissipated, it then passes through the shaping lens 1210, is reflected on the beam splitter 1211, and is reflected by the lens group 1205 and the reflector 1208 into the homogenizing element 1212, where it combines with the received laser and the blue laser.

[0223] Among them, the beam splitter 1211 reflects red laser or red-green-blue laser, transmits P-state blue laser from light source 1201, reflects S-state blue laser from light source 1202, transmits laser (such as filtered green fluorescence or red fluorescence), reflects green laser, and reflects red laser.

[0224] In the case where the second light source generates red laser light, the optical path can also be modified in the above embodiments, as shown in the reference. Figure 13 As shown in the left figure, the reflector 1208 in Embodiment 1 is removed, and the positions of the lens group 1205 and the light-diffusing element 1212 are changed. Thus, the light beam emitted from the beam splitter 1211 is homogenized by the lens group 1205 and the light-diffusing element 1212. The red laser generated by the light source 1202 is transmitted at the beam splitter 1211, and the blue laser and fluorescence emitted by the wavelength conversion device 1206 are reflected at the beam splitter 1211, thereby achieving a mixed light mode of fluorescence and laser.

[0225] In the case where a second light source generates tri-color laser light, the optical path can also be modified in the above embodiments, as shown in the reference. Figure 13 As shown in the right figure, by removing the reflector 1207 in Embodiment 1, the P-state blue laser generated by the light source 1201 can directly strike the fluorescence region or reflection region of the wavelength conversion device 1206. At this time, since the light source 1202 provides blue laser light, the blue laser light provided by the light source 1201 can be used entirely to excite fluorescence.

[0226] Example 2

[0227] Reference Figure 14As shown, the integrated wheel-type light-combining device includes a light source 1218, a beam splitter 1203, multiple lens groups 1204 and 1205, a wavelength conversion device 1206, a reflector 1207, a filter element 1209, a light-diffusing element or shaping lens 1210, a beam splitter 1211, a light-diffusing element 1212, a quarter-wave plate 1213, beam splitters 1214 and 1215, a reflector 1216, and a single-sided compound eye 1217.

[0228] Light source 1218 is used to generate tri-color lasers.

[0229] The quarter-wave plate 1213 is used to convert the polarization state of laser light.

[0230] The beam splitter 1214 is used to transmit a portion of the blue laser and reflect red laser, green laser and a portion of the blue laser. Preferably, it transmits most of the blue laser and reflects a small portion.

[0231] Beam splitter 1215 is used to transmit red laser light and reflect green laser light.

[0232] Beam splitter 1211 transmits P-state tri-color laser light and fluorescence, and reflects S-state tri-color laser light. It should be noted that the beam splitter can be implemented using a coating or a PBS prism.

[0233] The single-sided compound eye 1217 is used to homogenize the laser beam. The single-sided compound eye can be glued or printed on the phosphor wheel along the diffusion area of ​​the phosphor wheel. This method is more expensive and bulky. Alternatively, the single-sided compound eye can be placed with a smaller gap from the phosphor wheel, i.e., only a small single-sided compound eye is deployed. This method is less expensive and smaller.

[0234] It should be noted that in the embodiments of this application, there are cases where the same elements as in Embodiment 1 are not described. In such cases, the function of the element remains unchanged, and / or only the position changes.

[0235] In this embodiment, the P-state blue laser, P-state green laser, and P-state red laser generated by the light source 1218 are combined into a single path via beam splitters 1214 and 1215 and a reflector 1216. The P-state blue laser is split into two paths by beam splitter 1214: one path is used to excite fluorescence, and the other path is used for the blue light required in the optical path. A single-sided compound eye 1217 is added to the diffusion region of the wavelength conversion device 1206 using an adhesive bonding process or by relatively fixed adhesion. The diffusion region corresponding to the outer periphery of the fluorescence wheel 1206 is a reflective diffusion region.

[0236] For the optical path used to excite fluorescence with the P-state blue laser generated by light source 1218, the position of reflector 1207 is changed. The P-state blue laser generated by light source 1218 is reflected by beam splitter 1214, reflected by reflector 1207, transmitted by beam splitter 1203, and focused by lens group 1204 before reaching the fluorescence region of wavelength conversion device 1206. When the P-state blue laser irradiates the phosphor, it excites the generation of laser light in the first polarization state and the second polarization state, also known as fluorescence. After the fluorescence is shaped by lens group 1204, it is reflected by beam splitter 1203 and filtered by movable filter element 1209 to improve the color gamut. Then, the fluorescence passes through beam splitter 1211, lens group 1205 and homogenizing element 1212, and combines with the three-color laser light.

[0237] In this embodiment, for the P-state blue laser generated by the light source 1218 to provide the blue light required in the optical path, the P-state blue laser, P-state green laser, and P-state red laser generated by the light source 1218 are combined into one path through beam splitter 1214, beam splitter 1215, and reflector 1216. The P-state red laser and P-state green laser are reflected by beam splitter 1214, and part of the P-state blue laser is transmitted through beam splitter 1214 to be combined into one path. Further, the P-state red laser, P-state green laser, and part of the P-state blue laser are transmitted through beam splitter 1211, a quarter-wave plate, and a shaping lens 1210, and then reach the single-sided compound eye 1217 for homogenization. After being reflected by the reflective diffusion region, they are reflected again and then homogenized and dissipated by the single-sided compound eye 1217. After passing through a quarter-wave plate again, the polarization states of the three-color lasers in the light source 1218 are converted. After two reflections, the polarization states of the red laser, green laser, and part of the blue laser change from P state to S state. After being reflected by the beam splitter 1211, the lens group 1205 and the homogenizing element 1212 combine with the received laser light.

[0238] Example 3

[0239] Compared with Example 2, Example 3 refers to... Figure 15 As shown, a light source 1219 is added to the left side of the fluorescent wheel as a supplementary light source, and a beam splitter 1220 and a quarter-wave plate 1221 are added.

[0240] Light source 1219 is a blue laser light source used to generate blue laser light.

[0241] Beam splitter 1220 transmits P-state blue laser and reflects S-state blue laser.

[0242] In this embodiment, the light source 1219 generates P-state blue laser light, which is transmitted through the beam splitter 1220, and then irradiated by the wavelength conversion device 1206 through the quarter-wave plate 1221 for dissipation processing and reflection. After passing through the quarter-wave plate 1221 again, it becomes S-state blue laser light, and the beam splitter 1220 reflects the S-state blue laser light.

[0243] In the above embodiments, the optical path can also be changed. The blue laser in the light source 1218 can be used entirely to excite fluorescence, and the beam splitter 15 can be changed into a reflector to reflect the blue laser.

[0244] It should be noted that in the embodiments of this application, there are cases where the same elements as in Embodiment 1 are not described. In such cases, the function of the element remains unchanged, and / or only the position changes.

[0245] Example 4

[0246] Compared to Example 2, Example 4 is described with reference to... Figure 16 As shown, a quarter-wave plate 1222, a diffuser 1223, a mirror 1224, and a beam splitter 1225 are added, among which,

[0247] Diffuser 1223 is used to dissipate laser light.

[0248] Beam splitter 1225 is used to reflect blue laser light and transmit other light.

[0249] The beam splitter 1214 has modified thin film properties. The front surface is coated with a polarization coating that reflects P-state light and transmits S-state light, while the rear surface is coated with a wavelength-selective coating that reflects red and green light and transmits blue light.

[0250] The 1216 reflector element can be replaced with a beam splitter to reflect red laser and transmit blue laser.

[0251] Beam splitter 1215 is used to transmit red and blue lasers and reflect green lasers.

[0252] It should be noted that in the embodiments of this application, there are cases where the same elements as in Embodiment 1 are not described. In such cases, the function of the element remains unchanged, and / or only the position changes.

[0253] In this embodiment, when a P-state blue laser is used to irradiate the phosphor layer in the phosphor wheel 1206, the phosphor layer absorbs the P-state blue laser and generates fluorescence. However, since the phosphor layer does not completely absorb the blue laser, some unexcited blue laser light will return along the path. Therefore, a quarter-wave plate 1222 can be added between the beam splitter 1203 and the lens group 1204 to change the polarization state of the incident blue laser, so that it can be reused after returning along the original path.

[0254] In this embodiment, the beam splitter 1214 is replaced with a polarization coating on its front surface that reflects P-state light and transmits S-state light, and a wavelength-selective coating on its rear surface that reflects red and green light and transmits blue light. To ensure that the blue laser light irradiating the phosphor wheel 1206 is more uniform, a diffuser 1223 is added.

[0255] In this embodiment, for the optical path used to excite fluorescence by the P-state blue laser generated by the light source 1218, the P-state blue laser generated by the light source 1218 is reflected by the beam splitter 1214, diffused by the diffuser 1223, reflected by the mirror 1207, transmitted by the beam splitter 1203, and after passing through the quarter-wave plate 1222, it is focused on the lens group 1204 and reaches the fluorescence region of the wavelength conversion device 1206. When the P-state blue laser irradiates the phosphor, it excites and generates fluorescence and residual light. The residual P-state blue laser light is shaped by lens group 1204 and then passes through quarter-wave plate 1222. The residual P-state blue laser light then transitions from the P-state to the S-state. This residual S-state blue laser light is then transmitted through beam splitter 1203, reflected by mirror 1207, diffuser 1223, beam splitter or mirror 1214, beam splitter 1215, beam splitter 1216, reflected by mirror 1224, and reflected by beam splitter 1225 before illuminating the homogenizing element 1212. This process solves the problem of unrecoverable excitation light in fluorescence systems and improves system efficiency.

[0256] Example 5

[0257] In Example 5, compared to the examples above, the laser can circle the wavelength conversion device once. (See reference...) Figure 17 As shown, the integrated wheel-type light mixing device includes a three-color laser light source 1226, a movable reflector 1227 added before the blue laser generated by the three-color light source 1226, and a beam splitter 1228 added before the red and green lasers generated by the three-color light source 1226. The beam splitter 1228 transmits the blue laser and reflects the red and green lasers. Here, the red and green lasers, and / or the blue laser, can circle the wavelength conversion device 1206 once. When the device requires a pure three-color laser mode, the blue laser is completely reflected by the reflector 1227; when a mixed light mode of fluorescence and laser is required, the reflector 1227 is removed. It should be noted that the blue laser may or may not be polarized.

[0258] It should be noted that the device also includes lens groups 1229, 1230 and 1231, compound eyes 1232 and 1233, mirrors 1234, 1235, 1236 and 1239, a quarter-wave plate 1237, and a beam splitter 1238; wherein, the beam splitter 1238 is used to transmit red laser and green laser, as well as blue laser of the first polarization state, and to reflect fluorescence and blue laser of the second polarization state.

[0259] In this embodiment, when the device requires a pure three-color laser mode, a reflector 1227 is added. The laser source 1226 generates three-color lasers, with the blue laser in the P-state. The P-state blue laser is completely reflected by the reflector 1227, and the beam splitter 1228 transmits the blue laser while also reflecting the red and green lasers. At this time, the P-state blue laser, red laser, and green laser share the same optical path. At this time, the P-state blue laser, red laser, and green laser are reflected sequentially by mirror 1234, and after being dissipated by the laser dissipation area of ​​wavelength conversion device 1206, they are reflected by mirror 1235, focused and emitted in parallel by lens group 1230, and after being homogenized by compound eye 1232, they are reflected again by mirror 1236, transmitted through beam splitter 1238, focused in parallel by lens group 1231, and then emitted as three-color lasers after being homogenized by compound eye 1233. This eliminates laser speckle and color fringing ghosting phenomena, improving the user's viewing experience.

[0260] In this embodiment, when the device requires a mixed-light mode of laser and fluorescence, the reflector 1227 is removed. The laser source 1226 generates three-color lasers: P-state blue laser, red laser, and green laser. The P-state blue laser passes through the quarter-wave plate 1237 and the lens group 1229 to reach the wavelength conversion area or reflection area of ​​the wavelength conversion device. When the P-state blue laser irradiates the wavelength conversion area, the wavelength conversion area absorbs the blue laser, generates fluorescence, and reflects it. After passing through the lens group 1229 and the quarter-wave plate 1237, it is reflected by the reflector 1239 and reaches the beam splitter 1238. The beam splitter 1238 reflects the fluorescence, which is then uniformly emitted through the lens group 1231 and the compound eye 1233. When the P-state blue laser irradiates the reflection area, the reflection area reflects the P-state blue laser. After passing through the lens group 1229 and the quarter-wave plate 1237, due to passing through the quarter-wave plate 1237 twice, the blue laser changes from the P-state to the S-state. Subsequently, the S-state blue laser is reflected by mirror 1239 and reaches beam splitter 1238; beam splitter 1238 reflects the S-state blue laser and emits it uniformly after passing through lens group 1231 and compound eye 1233. The red and green lasers generated by the laser source 1226 are reflected by the beam splitter 1228. Then, the red and green lasers are reflected sequentially by the mirror 1234, and after being dissipated by the laser dissipation area of ​​the wavelength conversion device 1206, they are reflected by the mirror 1235, focused and emitted in parallel by the lens group 1230, and then homogenized by the compound eye 1232. After being reflected again by the mirror 1236 and transmitted through the beam splitter 1238, the red and green lasers, along with the fluorescent and S-state blue lasers, are focused in parallel by the lens group 1231 and homogenized by the compound eye 1233 before being combined and emitted. This achieves a three-color laser plus fluorescent light mixing mode, resulting in high brightness and a high color gamut, while eliminating laser speckle and color fringing ghosting phenomena, thus improving the user's viewing experience.

[0261] As described above, this application, through the aforementioned embodiments, employs an integrated wavelength conversion device, which can simultaneously achieve wavelength conversion and laser source dissipation, while reducing system size. Residual excitation light is recovered, improving system efficiency. No separate diffuser wheel or diffuser plate planar vibration device is required. The diffusion area in the single-sided compound eye and the wavelength conversion device is glued together, achieving the homogenization function of the double-sided compound eye. A three-color laser plus fluorescence mixing mode can be achieved, realizing high brightness and high color gamut, while eliminating laser speckle and color fringing ghosting phenomena, improving the user's viewing experience.

[0262] This application also provides a projection device, see embodiments thereof. Figure 18 As shown, the projection device 200 includes the light source device 100 involved in any of the above embodiments.

[0263] In some embodiments, the projection device may also include other components, such as a projection lens, the configuration of which can be found in related technologies and will not be described in detail here.

[0264] It should be understood that the terms "an embodiment," "an embodiment," "an embodiment of this application," "the foregoing embodiment," "some embodiments," or "some implementations" mentioned throughout the specification mean that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, the phrases "an embodiment," "an embodiment," "an embodiment of this application," "the foregoing embodiment," "some embodiments," or "some implementations" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above embodiments of this application are merely descriptive and do not represent the superiority or inferiority of the embodiments.

[0265] In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple units or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0266] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units. They may be located in one place or distributed across multiple network units. Some or all of the units may be selected to achieve the purpose of this embodiment according to actual needs.

[0267] In addition, each functional unit in the various embodiments of this application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0268] It is worth noting that the accompanying drawings in this application are only intended to illustrate the schematic positions of various devices on the device and do not represent their actual positions in the device. The actual positions of each device or region may be changed or shifted according to the actual situation (e.g., the structure of the device). Furthermore, the proportions of different parts of the device in the drawings do not represent the actual proportions.

[0269] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A light source apparatus, characterized by comprising: The light source device comprises: a light source assembly for emitting at least two kinds of lasers; the wavelength ranges of the at least two kinds of lasers do not overlap or partially overlap, and one or more of the at least two kinds of lasers have a first polarization state; a wavelength conversion device comprising a wavelength conversion region and a laser dissipation region, the wavelength conversion region being located on the optical path of the first laser of the first polarization state, and the laser dissipation region being located on the optical path of the second laser, the wavelength conversion region being used to generate a stimulated light under irradiation of the first laser, and the laser dissipation region being used to dissipate the second laser to form a third laser; the at least two kinds of lasers comprise the first laser and the second laser; a light combining assembly for guiding the stimulated light and the third laser to combine and emit from the same direction.

2. The apparatus of claim 1, wherein, The light combining assembly comprises a first light splitting element and a light combining element, the first light splitting element being located between the light source assembly and the wavelength conversion region, and the light combining element being located at the intersection position of the exit light path of the first light splitting element emitting the stimulated light and the exit light path of the wavelength conversion device emitting the second laser; The first light splitting element transmits the first laser of the first polarization state and reflects the stimulated light and the first laser of the second polarization state; The light combining element transmits or reflects the first laser of the first polarization state and the stimulated light, and reflects or transmits the first laser of the second polarization state and the second laser.

3. The apparatus of claim 2, wherein, The wavelength conversion device comprises a reflection region located on the optical path of the first laser, and the first laser is incident to the surface of the reflection region to be reflected to form a fourth laser; The light combining assembly further comprises one or more of a first phase difference element, a second phase difference element and a first reflection element, wherein The first phase difference element is located between the first light splitting element and the wavelength conversion region; The second phase difference element is located between the light combining element and the laser dissipation region; The first reflection element is located on the exit light path of the reflection region emitting the fourth laser, and the first light splitting element is located between the first reflection element and the wavelength conversion region.

4. The device of claim 3, wherein The first light splitting element comprises a first region and a second region, the first region is used to transmit the first laser and reflect the stimulated light, and the second region is used to reflect all light, and the reflection region has a diffusion property.

5. The apparatus of claim 1, wherein, The wavelength conversion device has at least one of the following characteristics: The wavelength conversion region and the laser dissipation region are distributed in a circular ring shape along the radial direction of the substrate of the wavelength conversion device; The wavelength conversion device periodically moves so that one or more wavelength conversion regions are periodically located on the optical path of the first laser at different times, and different wavelength conversion regions absorb the first laser and emit different stimulated lights. The wavelength conversion device further comprises a reflection region, the reflection region is arranged between the wavelength conversion regions, the wavelength conversion device periodically moves so that the wavelength conversion regions and the reflection region are periodically located in the light path of the first laser light at different times, the first laser light is incident to the surface of the reflection region to be reflected to form fourth laser light.

6. The apparatus of claim 1, wherein, The wavelength conversion device further comprises a single-surface fly-eye element, the single-surface fly-eye element is glued or printed on the laser light dissipation region of the wavelength conversion device, or the single-surface fly-eye element has a spacing distance between the target position and the laser light dissipation region. The single-surface fly-eye element has a first surface provided with a plurality of sub-eyes for homogenizing the irradiated laser light.

7. The device of any one of claims 1 to 6, wherein, The wavelength conversion region transmits or reflects the pumped light and the first laser light; The laser light dissipation region transmits or reflects the second laser light.

8. The device of any one of claims 2 to 4, wherein, The light source assembly comprises one or more of a first light source for generating the first laser light or the at least two kinds of laser light, a second light source for generating the second laser light or complementary light of the first laser light, and a first light guiding assembly. The light emitting side of the first light source is located on the side of the light combination assembly away from the wavelength conversion device, the first laser light of the first polarization state generated by the first light source is incident to the wavelength conversion region through the first light splitting element, and the optical axis of the first laser light is parallel to the optical axis of the pumped light. The light emitting side of the second light source is located on the side of the laser light dissipation region away from the light combination assembly, the second laser light generated by the second light source reaches the light combination element through the laser light dissipation region and combines with the pumped light; or, the light emitting side of the second light source is located on the side of the first light guiding assembly away from the laser light dissipation region, the complementary light of the first laser light of the second polarization state generated by the second light source is guided to the laser light dissipation region for dissipation through the first light guiding assembly, and then guided to the light combination assembly through the first light guiding assembly to combine with the pumped light and the third laser light and exit.

9. The apparatus of claim 8, wherein, The first light guiding assembly comprises a second light splitting element and a third phase difference element, the second light splitting element transmits light of the first polarization state and reflects light of the second polarization state.

10. The device of any one of claims 2 to 6, wherein, The light source assembly comprises a third light source and a second light guiding assembly, the second light guiding assembly comprises a first light path separation element, the first light path separation element transmits part of the first laser light and reflects part of the first laser light; or, the first light path separation element reflects the first laser light. The first laser light of the first polarization state generated by the third light source is partially reflected and / or transmitted through the first light path separation element, and at most guided to the wavelength conversion region through the second light guiding assembly. The first laser light of the first polarization state generated by the third light source is partially transmitted and / or reflected through the first light path separation element, and at most guided to the laser light dissipation region through the second light guiding assembly.

11. The device of any one of claims 2 to 4, wherein, The light source assembly includes a fourth light source, and the light combination assembly further includes a second reflective element with a through hole, which is arranged between the fourth light source and the first light splitting element; The light emitting side of the fourth light source is located on the side of the first light splitting element away from the wavelength conversion device, and the first laser generated by the fourth light source is incident on the wavelength conversion region through the through hole of the second reflective element and the first light splitting element to generate the stimulated laser and the residual first laser; Wherein, the stimulated laser is reflected by the first light splitting element and transmitted or reflected by the light combination element, and the residual first laser is transmitted by the first light splitting element and reflected by the second reflective element to be incident on the wavelength conversion region again for laser recycling.

12. The device of any one of claims 1 to 6, wherein, The wavelength conversion device includes a reflection region located on the optical path of the first laser, the light source assembly includes a fifth light source, and the light combination assembly further includes a third light guiding assembly including a seventh light splitting element, a plurality of third reflective elements and a fourth phase difference element, and the first light splitting element is a moving element; the plurality of third reflective elements are arranged around the wavelength conversion device; The first light splitting element transmits part of the first laser, reflects part of the first laser and the stimulated laser, transmits light of the first polarization state, and reflects light of the second polarization state; The seventh light splitting element transmits the first laser and reflects the second laser; The third reflective element reflects all light; Part of the first laser of the first polarization state generated by the fifth light source is transmitted by the first light splitting element, the fourth phase difference element, and irradiated to the wavelength conversion region or the reflection region to generate the stimulated laser and the fourth laser of the first polarization state, and the stimulated laser and the fourth laser of the first polarization state are reflected by the fourth phase difference element and the first light splitting element again and reflected by the light combination element to be emitted; Part of the first laser generated by the fifth light source is reflected by the first light splitting element and transmitted by the seventh light splitting element, and together with the second laser generated by the fifth light source, it is reflected by the plurality of third reflective elements, dissipated by the laser dissipation region, transmitted by the light combination element, and combined with the stimulated laser and the fourth laser to be emitted.

13. The device of any one of claims 2 to 4, wherein, The wavelength conversion device includes a reflection region located on the optical path of the first laser, the light source assembly includes a sixth light source, and the light emitting side of the sixth light source is located on the side of the first light splitting element away from the wavelength conversion device, and the sixth light source is used to generate first laser of first polarization state; The light combination assembly further includes a fourth reflective element, which is arranged between the first light splitting element and the light combination element, or the fourth reflective element is arranged on the side of the light combination element away from the first light splitting element, or the fourth reflective element is arranged between the light combination element and the wavelength conversion device; The first laser of the first polarization state is transmitted through the first light splitting element, irradiates to the wavelength conversion region to generate the stimulated laser of the first polarization state and the stimulated laser of the second polarization state, the stimulated laser of the first polarization state is reflected by the first light splitting element, transmitted or reflected by the light combining element and exits; the stimulated laser of the second polarization state is reflected by the first light splitting element, reflected or transmitted by the light combining element, reflected by the fourth reflecting element, reflected or transmitted by the light combining element, reflected by the first light splitting element to the diffused reflecting region, diffusedly reflected, reflected by the first light splitting element again, reflected or transmitted by the light combining element and exits, and the light combining element exits all the stimulated laser of the second polarization state through the above cycle; or, the stimulated laser of the second polarization state is reflected by the first light splitting element, reflected by the fourth reflecting element, transmitted by the light combining element and reaches the laser dissipation region or the diffused reflecting region; the wavelength range of the first laser overlaps with that of the stimulated laser.

14. A projection apparatus, characterized by, The projection device comprises the light source device according to any one of claims 1 to 13.

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