Light source system and projection device

Abstract

The application relates to the technical field of display, and discloses a light source system and a projection device. After the light emitted by the excited light, the additional excited light emitted by the first light source assembly and the base color light emitted by the second light source assembly are combined, the problems of speckle, color edge ghosting and color unevenness can be weakened; when the wavelength conversion device is excited, part of the excited light remains, the light recycling assembly can simultaneously realize recycling of the target excited light and re-excitation of the residual excited light, the light efficiency of the light source system can be improved.

Description

Technical Field

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

[0002] In projection display products, the light source system is a very important component. Its function is to convert light of different colors, angles, brightness and shape into a uniform light spot that illuminates the effective area of ​​the display chip.

[0003] Laser light sources, as the primary light source in most projection display products, offer advantages such as high brightness, wide color gamut, and vivid images. However, their disadvantage lies in the speckle effect caused by the reflection of highly coherent laser light on the projection surface, affecting the viewing experience. Using short-wavelength lasers to excite fluorescence and then combining it with the laser light is a common technique that can supplement brightness and reduce laser speckle. However, the excitation efficiency of laser-excited fluorescence is currently relatively low. Summary of the Invention

[0004] This application provides a light source system that can be used in projection equipment. It can improve excitation efficiency, and the excitation light, the additional excitation light emitted by the first light source component, and the primary color light emitted by the second light source component are combined and emitted, which can reduce the problems of speckle, color fringing, ghosting, and color unevenness.

[0005] In a first aspect, this application provides a light source system, including a first light source assembly, a first beam splitter, a light recycling assembly, a second light source assembly, a beam splitter and beam combiner, a first shaping lens group, and a wavelength conversion device; the light recycling assembly is disposed between the first light source assembly and the beam splitter and beam combiner, or the elements in the light recycling assembly are disposed on at least two sides of the beam splitter and beam combiner; the light emitted from the first light source assembly is split into excitation light and supplementary light by the first beam splitter; the excitation light is directed to the wavelength conversion device after passing through the beam splitter and beam combiner and the first shaping lens group, or the excitation light is directed to the wavelength conversion device; the wavelength conversion device is controlled by the first beam splitter and beam combiner. The light emitted after excitation includes excited light and residual excitation light, both of which are directed towards the first shaping lens group. The excited light is shaped by the first shaping lens group and then directed towards the beam splitter and combiner element, which guides it to the beam combining path for emission. The residual excitation light is shaped by the first shaping lens group and then directed towards the beam splitter and combiner element and the light reuse component, which can then be directed again towards the wavelength conversion device for re-excitation. The second light source component emits at least one primary color light. The additional light and the primary color light are guided by the beam splitter and combiner element to the beam combining path for emission.

[0006] In some optional embodiments, the first beam splitter includes a first partition and a second partition arranged in a partitioned manner, wherein the first partition transmits light emitted from the first light source assembly and the second partition reflects light emitted from the first light source assembly; or, the first beam splitter has a coating layer that partially transmits and partially reflects light emitted from the first light source assembly; or, the first beam splitter is a reflective element that partially blocks light emitted from the first light source assembly to split the light into excitation light and additional light.

[0007] In some optional embodiments, if the optical axis of the excitation light emitted from the first light source assembly coincides with the optical axis of the first shaping lens group, the light reuse assembly is disposed between the first light source assembly and the light splitting and combining element; the light reuse assembly includes a first polarization conversion element and a polarization separation element; the polarization state of the excitation light emitted from the first light source assembly is a first polarization state; the first polarization state excitation light emitted from the first light source assembly passes through the polarization separation element and the first polarization conversion element when it is directed toward the wavelength conversion device; the residual excitation light, after being directed toward the light reuse assembly by the light splitting and combining element, first passes through the first polarization conversion element and then toward the polarization separation element, and the polarization state of the residual excitation light after passing through the first polarization conversion element twice is converted to a second polarization state; the residual excitation light in the second polarization state is reflected by the polarization separation element and then directed toward the first polarization conversion element. After passing through the first polarization conversion element and the beam splitter / combiner, the light can be re-excited by the wavelength conversion device; or, the light reuse assembly includes a first polarization conversion element, a second beam splitter, and a fifth reflector; the polarization state of the excitation light emitted from the first light source assembly is a first polarization state; after the residual excitation light passes through the beam splitter / combiner and is directed to the light reuse assembly, it first passes through the first polarization conversion element and then passes through the second beam splitter. The polarization state of the residual excitation light after passing through the first polarization conversion element twice is converted to a second polarization state. The residual excitation light in the second polarization state is reflected by the second beam splitter and then directed to the fifth reflector. It is reflected back to the second beam splitter by the fifth reflector and then reflected again by the second beam splitter before being directed to the first polarization conversion element. After passing through the first polarization conversion element and the beam splitter / combiner, the light can be re-excited by the wavelength conversion device.

[0008] In some optional embodiments, if the optical axis of the excitation light emitted from the first light source assembly is offset from the optical axis of the first shaping lens group, the light reuse assembly includes a seventh reflecting element; the residual excitation light is directed to the seventh reflecting element via the beam splitter and combiner, and the seventh reflecting element reflects the residual blue light back to the beam splitter and combiner, and then directed to the wavelength conversion device again for re-excitation.

[0009] In some optional embodiments, the optical axis of the seventh reflective element is symmetrical with respect to the optical axis of the excitation light emitted from the first light source assembly relative to the optical axis of the first shaping lens group; and / or, the long side of the seventh reflective element is greater than or equal to the long axis of the residual excitation light spot, and the short side of the seventh reflective element is greater than or equal to the short axis of the residual excitation light spot.

[0010] In some optional embodiments, the elements in the light reuse assembly are disposed on at least two sides of the beam splitter / combiner; the excitation light emitted from the first light source assembly has a first polarization state; the beam splitter / combiner transmits the excitation light of the first polarization state and reflects the excitation light of the second polarization state; the light reuse assembly includes a first polarization conversion element and a third beam splitter; the excitation light of the first polarization state emitted from the first light source assembly passes through the first polarization conversion element when it is directed toward the wavelength conversion device; the residual excitation light is directed toward the first polarization conversion element through the first shaping lens group, and the polarization state of the residual excitation light after passing through the first polarization conversion element twice is converted to the second polarization state, the residual excitation light of the second polarization state is directed toward the beam splitter / combiner, reflected by the beam splitter / combiner, directed toward the third beam splitter, reflected back to the beam splitter / combiner, and after passing through the beam splitter / combiner and the first polarization conversion element, it can be directed toward the wavelength conversion device again for re-excitation; wherein, the third beam splitter can transmit the first polarization state excitation light. The light in the first light source assembly reflects light in the second polarization state, or the third beam splitter reflects light whose main wavelength is the target wavelength, and the main wavelength of the excitation light emitted from the first light source assembly is the target wavelength; or, the light reuse assembly includes a first polarization conversion element, a fourth beam splitter element, and a sixth reflector element; the excitation light in the first polarization state emitted from the first light source assembly passes through the first polarization conversion element when it is directed toward the wavelength conversion device; the residual excitation light is directed toward the first polarization conversion element through the first shaping lens group, and the polarization state of the residual excitation light after passing through the first polarization conversion element twice is converted to the second polarization state, the residual excitation light in the second polarization state is directed toward the beam splitter and combiner element, is reflected by the beam splitter and combiner element and then directed toward the fourth beam splitter element, is reflected by the fourth beam splitter element and then directed toward the sixth reflector element, is reflected back to the fourth beam splitter element, is reflected again by the fourth beam splitter element and then directed toward the beam splitter and combiner element, and can be directed toward the wavelength conversion device again for re-excitation by the beam splitter and combiner element and the first polarization conversion element.

[0011] In some optional embodiments, when the stimulated light passes through the beam splitter and combiner, the target stimulated light is directed towards the light reuse component. The target stimulated light is light whose wavelength coincides with the wavelength of the primary color light emitted from the second light source component and whose polarization state is a first polarization state. The light reuse component reflects the target stimulated light back to the beam splitter and combiner, and then, through the beam splitter and combiner and the first shaping lens group, is directed towards the wavelength conversion device. A first stimulated light and a second stimulated light are emitted from the wavelength conversion device. The polarization state of the second stimulated light is the same as that of the target stimulated light, while the polarization state of the first stimulated light is different from that of the second stimulated light. After passing through the first shaping lens group, the first stimulated light is directed towards the beam splitter and combiner, and then guided by the beam splitter and combiner to the combined light path for emission. The second stimulated light is transmitted through the beam splitter and combiner and then directed towards the light reuse component, and this cycle repeats.

[0012] In some alternative embodiments, the light reuse assembly includes a target beam splitter; the target beam splitter transmits the excitation light emitted from the first light source assembly and reflects the target excited light; or, the target beam splitter transmits the excitation light emitted from the first light source assembly and the residual excitation light and reflects the target excited light.

[0013] In some optional embodiments, the optical axis of the excitation light emitted from the first light source assembly is offset from the optical axis of the first shaping lens group; the light reuse assembly includes a target reflecting element; the target reflecting element includes a target region that reflects residual excitation light; other regions of the target reflecting element transmit the excitation light emitted from the first light source assembly and reflect the target stimulated light; or, the optical axis of the excitation light emitted from the first light source assembly coincides with the optical axis of the first shaping lens group; the light reuse assembly includes a fifth beam splitter, the fifth beam splitter including a beam splitting region, the beam splitting region being a through-hole, a substrate coated with an anti-reflection film, or a dichroic lens; the beam splitting region transmits the excitation light emitted from the first light source assembly, and other regions reflect the residual excitation light and the target stimulated light; or, the beam splitting region transmits the excitation light emitted from the first light source assembly and reflects the target stimulated light; other regions reflect the residual excitation light and the target stimulated light.

[0014] In some optional embodiments, the wavelength conversion device includes at least one conversion zone, each conversion zone corresponding to a type of stimulated light, and a filter element is provided on the light-emitting side of each conversion zone to filter the corresponding stimulated light; and / or, the wavelength conversion device further includes a transmission zone, and the light source system further includes a reflection guiding component, the reflection guiding component being used to guide the excitation light transmitted by the transmission zone to the combined light path for emission.

[0015] In some alternative implementations, the wavelength conversion device is one of a dynamic phosphor wheel, a static phosphor sheet, and a CGLED.

[0016] In some optional embodiments, the additional light and the primary color light emitted by the second light source assembly are combined into a combined beam by the first light combining assembly, and the combined beam is emitted to the light splitting and combining element and guided by the light splitting and combining element to the combined light path.

[0017] Secondly, this application provides a projection device, including a light source system as described in any one of the first aspects and possible implementations of the first aspect.

[0018] In the light source system provided in this application, the excited light, the additional excitation light emitted by the first light source component, and the primary color light emitted by the second light source component are combined and emitted, which can reduce the problems of speckle, color fringing, ghosting, and color unevenness. Furthermore, when the wavelength conversion device is excited, some excitation light will remain. The light reuse component can simultaneously realize the recovery of the target excited light and the re-excitation of the remaining excitation light, thereby improving the light combination efficiency and excitation efficiency, and thus improving the luminous efficiency of the light source system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the light source system corresponding to Method 1 in this invention.

[0020] Figure 2 This is a schematic diagram of the structure of the first light source component in this invention.

[0021] Figure 3 This is a schematic diagram of the structure of the second light source component in this invention.

[0022] Figure 4 This is a partial structural schematic diagram of the second light source component in this invention.

[0023] Figure 5 for Figure 1 A schematic diagram of the structure after adding a target light source to the original design.

[0024] Figure 6 This is a schematic diagram of the light source system corresponding to Method 2 in this invention.

[0025] Figure 7 This is a schematic diagram of the light source system corresponding to Method 3 in this invention.

[0026] Figure 8 This is a schematic diagram of the light source system corresponding to Method 4 in this invention.

[0027] Figure 9 This is a schematic diagram of the light source system corresponding to Method 5 in this invention.

[0028] Figure 10 This is a schematic diagram of the light source system corresponding to Method Six in this invention.

[0029] Figure 11 This is a schematic diagram of the light source system corresponding to Method 7 in this invention.

[0030] Figure 12 For the present invention in Figure 1 The diagram shows the structure after adding a reflection guidance component to the original design.

[0031] Figure 13 This is a schematic diagram of the projection device in this invention. Detailed Implementation

[0032] This application provides a light source system, such as... Figure 1 As shown, the light source system includes a first light source component 01, a first beam splitting element 51, a light reuse component, a second light source component 02, a beam splitting and combining element 12, a first shaping lens group 15, and a wavelength conversion device 16.

[0033] The light reuse component is disposed between the first light source component 01 and the light splitting and combining element 12, or the elements in the light reuse component are disposed on at least both sides of the light splitting and combining element 12.

[0034] The light emitted from the first light source component 01 is split into excitation light and additional light by the first beam splitting element 51.

[0035] The excitation light is directed to the wavelength conversion device 16 after passing through the light splitting and combining element 12 and the first shaping lens group 15, or the excitation light is directed to the wavelength conversion device 16.

[0036] The wavelength conversion device 16 emits light after being excited by the excitation light, which includes excited light and residual excitation light. Both the excited light and the residual excitation light are directed toward the first shaping lens group 15.

[0037] The stimulated light is shaped by the first shaping lens group 15 and then directed to the beam splitter and beam combiner 12, and then guided by the beam splitter and beam combiner 12 to exit the beam combiner path.

[0038] The residual excitation light is shaped by the first shaping lens group 15 and then directed to the light splitting and combining element 12 and the light reuse component. After being directed to the wavelength conversion device 16 by the light reuse component and the light splitting and combining element 12, it can be re-excited.

[0039] The second light source component 02 emits at least one primary color light.

[0040] The additional light and the primary color light are guided by the beam splitter and combiner element 12 to the beam combining path for emission.

[0041] This application improves excitation efficiency by cyclically re-exciting the residual excitation light by directing it back to the wavelength conversion device 16. By guiding the additional light from the light emitted by the first light source component 01, along with the excited and primary color light emitted by the second light source component 02, to the combining light path for emission, the emission brightness can be improved, while also reducing problems such as speckle, color fringing, and color unevenness.

[0042] As an optional implementation method, such as Figure 1 As shown in the embodiments of this application, the light source system may further include a light homogenizing element 23. The light guided by the beam splitting and combining element 12 to the beam combining path is homogenized by the light homogenizing element 23 before being emitted. The light homogenizing element 23 may be a single-sided compound eye, a double-sided compound eye, or a light bar, etc.

[0043] As an optional implementation method, such as Figure 1 As shown in the embodiment of this application, the light source system may further include a second shaping lens group 20, a fourth reflecting element 21, and a third shaping lens group 22 between the beam splitter / combiner element 12 and the light homogenizer element 23. Light guided by the beam splitter / combiner element 12 to the beam combining path and then emitted is shaped by the second shaping lens group 20 and then directed to the fourth reflecting element 21. After being reflected by the fourth reflecting element 21, it is shaped by the third shaping lens group 22 and then directed to the light homogenizer element 23 for homogenization before exiting. The fourth reflecting element 21 folds the light path, reducing the size of the light source system. The second shaping lens group 20 and the third shaping lens group 22 can shape the light to be directed to the light homogenizer element 23 into collimated light, making the light spot directed to the light homogenizer element 23 more uniform.

[0044] In addition, a quarter-wave plate can be placed between the beam splitter / combiner 12 and the beam homogenizer 23. The polarization state of the light to be directed toward the beam homogenizer 23 can be changed by the quarter-wave plate, which, combined with the subsequent spatial light modulator, can improve the brightness uniformity problem.

[0045] As an optional implementation method, such as Figure 2 As shown, the first light source assembly 01 includes an excitation light source 17, and the excitation light / additional light are not limited. The excitation light source 17 can be a laser LD or LED, or other novel light sources, or a hybrid light source of laser LD and LED, etc. The number of light-emitting chips in the excitation light source 17 is not limited; it can be a single light-emitting chip or an array of light-emitting chips.

[0046] For example, the excitation source 17 can be a blue laser LD, and the excitation light / additional light can be a blue laser. The wavelength range of the blue laser is not limited, for example, the wavelength is 430nm-480nm; or the main wavelength of the blue laser / additional light is 455nm.

[0047] For example, the excitation light source 17 is a blue LED, and the excitation light / additional light is blue LED light. In this case, the wavelength conversion device 16 is a wavelength conversion sheet, which can be a static phosphor sheet (such as a yellow, green, orange, red, or tangerine phosphor sheet). The blue LED light emitted from the blue LED is used as the excitation light to excite the wavelength conversion sheet.

[0048] Optional, such as Figure 2 and Figure 5 As shown, the first light source assembly 01 includes an excitation light source 17 and a target light source 03, and the wavelength conversion device 16 is a wavelength conversion plate. For example, the excitation light source 17 is a blue LED. The excitation light emitted by the blue LED and the light emitted by the target light source 03 are both used as excitation light to excite the wavelength conversion plate on both sides. The target light source 03 can be integrated with the wavelength conversion plate, such as CGLED and YLED.

[0049] For example, both the excitation light source 17 and the target light source 03 are blue laser LDs, and the wavelength conversion device 16 is a transmissive phosphor wheel.

[0050] like Figure 5 As shown, a film layer that transmits blue light and reflects excited light is provided in the conversion area of ​​the fluorescent wheel near the target light source 03. Two blue laser LDs excite the conversion area from both sides. A focusing lens group can also be provided between the target light source 03 and the fluorescent wheel.

[0051] As another optional implementation, the primary color light emitted by the second light source component 02 is not limited and may include at least one of red, green, and blue light. The light source in the second light source component 02 is not limited and may be an LED, a laser LD, or other novel light sources, or a hybrid light source of LED and laser LD, etc. Optionally, the primary color light emitted by the second light source component 02 is narrow-spectrum light.

[0052] Optionally, the second light source assembly 02 includes at least one of a blue laser source, a red laser source, and a green laser source. The number of light-emitting chips in each laser source is not limited; it can be a single light-emitting chip or an array of light-emitting chips. Optionally, the polarization state of the laser light emitted from each laser source is not limited; it can be either a P-state or an S-state.

[0053] For example, the primary color light emitted by the second light source component 02 includes green laser, red laser, and blue laser in a first polarization state, and the light splitter / combiner element 12 transmits the green laser, red laser, and blue laser in the first polarization state. The first polarization state is not limited and can be either P-state or S-state. The polarization states of the red and blue lasers can be the same as or different from the polarization state of the green laser. The wavelength of the blue laser is not limited; for example, the dominant wavelength of the blue laser is 455 nm.

[0054] Optionally, when the excitation light / additional light emitted by the first light source component 01 is blue laser, its polarization state is the same as that of the blue laser emitted by the second light source component 02, which can be either P state or S state, for example, P state.

[0055] Optional, such as Figure 3 As shown, the second light source assembly 02 includes a first laser light source 1 and a second laser light source 2. When the first laser light source 1 and / or the second laser light source 2 include 4 red laser light-emitting chips, 3 green laser light-emitting chips, and 2 blue laser light-emitting chips, the power supply current of the first laser light source 1 and / or the second laser light source 2 is between 6A and 8A. The first laser light source 1 and the second laser light source 2 overcome the limitation of power supply current, ensuring sufficient blue light in the light source system and achieving a better light combining ratio.

[0056] Optionally, polarization conversion elements can be placed on the output side of each color laser source to change the polarization state of each color laser to meet the requirements of subsequent optical paths. The polarization conversion elements can be half-wave plates, quarter-wave plates, etc.

[0057] For example, such as Figure 3 As shown, the second light source assembly 02 may be equipped with polarization conversion elements 24, 25, and 26 corresponding to the first laser light source 1 and polarization conversion elements 27, 28, and 29 corresponding to the second laser light source 2.

[0058] Optionally, the second light source component 02 emits red laser light. For example... Figure 3 As shown, the second light source assembly 02 includes a first laser source 1 and a second laser source 2 that are independent of each other, as well as a light guide assembly. The first laser source and the second laser source 2 are arranged opposite each other. The light guide assembly may include, but is not limited to, reflective elements, dichroic elements, etc. For example, the light guide assembly includes reflective elements 3 and 4, and dichroic elements 5 and 6. The first spot of the red laser emitted from the first laser source 1 and the second spot of the red laser emitted from the second laser source 2 are guided by the light guide assembly to form a side-by-side spot. In the side-by-side spot, the major axis of the first spot is parallel to the major axis of the second spot, and the minor axis of the first spot is on the same straight line as the minor axis of the second spot. Therefore, the side-by-side spot can be relatively small, which can reduce the size of subsequent elements and thus reduce the volume of the light source system. The long sides of both the first laser source 1 and the second laser source 2 are parallel to the optical axis of the laser beam emitted from the second light source assembly 02. Both the first laser source 1 and the second laser source 2 have at least two rows of light-emitting chips arranged in a first direction. Each row of light-emitting chips has multiple light-emitting chips arranged along a second direction. The long side of the side-by-side light spot of the laser beam is related to the length of each row of light-emitting chips in the second direction. The first direction corresponds to the long side of the first laser source 1 and the second laser source 2, and the second direction corresponds to the short side of the first laser source 1 and the second laser source 2.

[0059] Optional, such as Figure 3 As shown, the lasers emitted from the first laser source 1 and the second laser source 2 are combined by the light guide assembly and then directed towards the dynamic dispersion element 7 to suppress speckle.

[0060] Optional, such as Figure 2 As shown, a first speckle suppression element 18 is provided on the light-emitting side of the first light source assembly 01, and / or, as shown... Figure 3 As shown, a second speckle suppression element 11 is provided on the light-emitting side of the second light source assembly 02. The first speckle suppression element 18 and the second speckle suppression element 11 can be a diffuser, a diffuser wheel, a compound eye, a dynamic dissipation element (LSR), etc. The first speckle suppression element 18 and the second speckle suppression element 11 can homogenize the excitation light / additional light and the laser, thereby making the light spot distribution directed towards the homogenizing element 23 more uniform, thus improving the speckle problem.

[0061] like Figure 4 The diagram shown is a partial structural schematic of a second light source component 02 provided in an embodiment of this application, illustrating the arrangement of the first laser source 1 and the second laser source 2. In this embodiment, the distance between the laser beam emitted from the first laser source 1 and the laser beam emitted from the second laser source 2 can reach 3mm or 2mm, or even smaller. The distance between the laser beam spots is further shortened by adjusting the position of the light-emitting chip, thereby improving the utilization rate of the laser in the light source system and reducing the size of the light source system.

[0062] Optionally, the first laser source 1 and the second laser source 2 also emit blue and green lasers. The distance from the emission side of the light source component to the position where the red laser is emitted by the first laser source 1 and / or the second laser source 2 is shorter than the distance from the emission side of the light source component to the position where the blue and green lasers are emitted. The larger divergence angle of the red laser, and its proximity to the emission side, can reduce the size of the light source system.

[0063] Optionally, in order to direct the laser emitted from the second light source assembly 02 towards the beam splitting and combining element 12, such as... Figure 3 As shown, a reflective element 9 and a shaping lens group 10 can also be provided on its light-emitting side. Similarly, in order to enable the excitation light / additional light emitted from the first light source assembly 01 to be directed towards the light splitting and combining element 12, a reflective element and a shaping lens group can also be provided on its light-emitting side.

[0064] It should be noted that the shaping lens group mentioned in this application may include one or more lenses, which may be spherical lenses or aspherical lenses, and their curvature parameters may be customized according to the actual application.

[0065] Optional, such as Figure 3As shown, the second light source assembly 02 also includes a third laser light source 34. The third laser light source 34 emits blue laser light. The light guide assembly is used to combine the blue laser light emitted by the third laser light source 34 with the blue laser light emitted by the first laser light source 1 and the second laser light source 2. The light guide assembly also includes a reflective element 36, in which case reflective elements 3 and 4 need to be replaced with dichroic elements; or, the third laser light source 34 is located between the first laser light source 1 and the second laser light source 2, passing through the middle of reflective elements 3 and 4, and combining with the blue laser light emitted by the first laser light source 1 and the second laser light source 2.

[0066] Optionally, a polarization conversion element 35 can also be provided on the light-emitting side of the third laser source 34 to convert the polarization state of the blue laser to meet the needs of the subsequent optical path.

[0067] This application reduces the heat dissipation pressure on the first laser source 1 and the second laser source 2 by adding a third laser source 34 as a blue laser source, while improving the brightness of the projection device.

[0068] Optional, such as Figure 3 As shown, the second light source assembly 02 includes a first compound eye 8, and the light-diffusing element 23 serves as the second compound eye. The incident angle of the light emitted from the second light source assembly 02 towards the first compound eye 8 is greater than the incident angle towards the second compound eye. The first compound eye 8 can be a hexagonal glass compound eye, and the second compound eye can be a double-sided compound eye, thereby enabling better light uniformity.

[0069] Optionally, the incident angle of the light incident on the second compound eye is less than a preset angle threshold. The preset angle threshold is not limited; for example, it could be 10 degrees. Light incident on the second compound eye at a smaller angle is more uniform, thus suppressing speckle problems and resulting in more uniform image quality from the projection device. It should be noted that if the light-diffusing element 23 is a light bar, the above limitation on the incident angle of the light may not be required.

[0070] Optionally, the first light source assembly 01 and the second light source assembly 02 are arranged side by side on one side of the light splitting and combining element 12, which can better dissipate heat, stabilize the light emitted by the light source system, improve image quality, and provide a larger power supply voltage to the light-emitting chip, thereby improving the brightness of the projection device.

[0071] In some optional embodiments, the wavelength conversion device 16 includes at least one conversion region, which includes an antireflection layer, a wavelength conversion layer, and a reflective layer. Excitation light passes through the antireflection layer and then strikes the wavelength conversion layer. The wavelength conversion layer is excited by the excitation light to generate excited light, which is then reflected by the reflective layer and emitted.

[0072] Optionally, the wavelength conversion device 16 may include a first region and a second region, each region corresponding to a wavelength conversion material, capable of generating at least one color of light with a wavelength different from the excitation light, i.e., the excitation light can be at least one of yellow fluorescence, red fluorescence, green fluorescence, orange fluorescence, cyan fluorescence, or yellow fluorescence. For example, the wavelength conversion layer of the first region (G region) is a mixture of green or cyan phosphor and organic adhesive, which is excited to generate green or cyan fluorescence; the green phosphor is aluminate, silicate, or β-thionolite green phosphor, and the organic adhesive is high-temperature silicone or epoxy adhesive; the wavelength conversion layer of the second region (R region) is a mixture of yellow, orange, or red phosphor and organic adhesive, which is excited to generate yellow, red, orange, or yellow fluorescence; the red phosphor is nitride, silicate, or α-thionolite red phosphor, the orange phosphor is a mixture of yellow and red phosphor, or silicate orange phosphor, and the organic adhesive is high-temperature silicone or epoxy adhesive.

[0073] Optionally, each conversion region of the wavelength conversion device 16 corresponds to a type of stimulated light, and a filter element is provided on the light-emitting side of each conversion region to filter the corresponding stimulated light. The filter element can be a filter sheet or a film layer deposited on the light-emitting surface of the wavelength conversion device 16, such as a film deposited on an antireflection layer. Assuming the device includes a first region and a second region, with the first region generating green fluorescence and the second region emitting red fluorescence, the filter element on the light-emitting side of the first region filters the green fluorescence, and the filter element on the light-emitting side of the second region filters the red fluorescence. Optionally, the stimulated light is broadband light.

[0074] Optionally, the conversion zone in the wavelength conversion device 16 is provided with phosphor, and the phosphor ratio and thickness in each conversion zone are within a preset range. The preset ratio and thickness ranges are not limited; for example, the phosphor thickness can be 0.1mm-0.25mm, preferably 0.15mm-0.2mm; the ratio of phosphor to organic adhesive is 2.5:1-3.5:1. The proportion of residual excitation light can be changed by adjusting the phosphor concentration and thickness.

[0075] Optionally, the antireflective layer can be glass, sapphire, silicon carbide coated with an antireflective film, a nano-SiO2 film, or a beam splitter. Optionally, the antireflective film is deposited on the outer surface of the sapphire, and the inner surface is bonded to the wavelength conversion layer; the thickness is 0.2mm-1mm, preferably 0.4mm. If blue laser light directly irradiates the sapphire, the sapphire has good temperature resistance, and the excitation light passes through the sapphire before being incident on the wavelength conversion layer, which can improve the radiation power density resistance of the wavelength conversion layer. The antireflective layer reduces the transmission of blue light, and the refractive index difference between the antireflective layer and the wavelength conversion layer is less than a preset threshold. The preset threshold can be customized according to the actual application, for example, 0-0.5, preferably 0-0.2, such as when the refractive indices of both the antireflective layer and the wavelength conversion layer are 1.5-1.7.

[0076] Optionally, the transmittance of light transmitted through the antireflection layer is greater than 98%, the transmittance of light reflected from the antireflection layer is less than 2%, and the transmittance of light partially transmitted and partially reflected from the antireflection layer is 50%. For example, in the first antireflection layer region, light in the 400nm-561nm wavelength band is transmitted with a transmittance T greater than 98%; light in the 595nm±4nm wavelength band is partially transmitted and partially reflected with a transmittance T of 50%; and light in the 615nm-700nm wavelength band is reflected with a transmittance T less than 2%. In the second antireflection layer region, light in the 400nm-465nm wavelength band is transmitted with a transmittance T greater than 98%; light in the 470nm±4nm wavelength band is partially transmitted and partially reflected with a transmittance T of 50%; light in the 489nm-592nm wavelength band is reflected with a transmittance T less than 2%; and light in the 616nm-693nm wavelength band is transmitted with a transmittance T greater than 98%. That is, the first antireflection layer area can transmit blue and green light (short wavelength) and reflect red light (long wavelength), while the second antireflection layer area can transmit blue and red light and reflect green light; the antireflection layer and the filter film layer coated on the antireflection layer can transmit blue light and transmit the desired fluorescence, and reflect the unwanted fluorescence, thereby improving the color gamut.

[0077] Optionally, the wavelength conversion layer contains a wavelength conversion material, which can be a phosphor or a phosphor. For example, it can be a yellow phosphor that emits yellow light when excited, such as a yttrium aluminum garnet (YAG) phosphor containing cerium (Ce) as an activator, or it can be a green phosphor, red phosphor, yellow phosphor, orange phosphor, citrus phosphor, cyan phosphor, etc.

[0078] The proportion of excited light in the light emitted from the wavelength conversion layer to the antireflection layer is greater than a preset proportion threshold; the preset proportion threshold is not limited, for example, it can be 97%. Therefore, when blue light is emitted to the wavelength conversion layer, the reflected blue light can be reduced, thereby reducing the proportion of blue light in the light emitted from the wavelength conversion device 16, that is, reducing residual blue light, which can improve the color gamut of the projection device.

[0079] Optionally, the reflective layer can be a reflective film deposited on the heat dissipation substrate, such as printing a diffuse white layer on the heat dissipation substrate. The diffuse white layer reflects blue light and fluorescence. The diffuse white layer is composed of a mixture of adhesive and nano-reflective powder. The adhesive can be organic or inorganic, and the nano-reflective powder is composed of nano-TiO2, Al2O3, MgO, etc. Alternatively, the heat dissipation substrate can be polished, such as a polished aluminum substrate. The thickness of the heat dissipation substrate is approximately 0.5 mm.

[0080] The energy of the excitation light incident from the antireflection layer to the wavelength conversion layer accounts for more than 90% of the total energy, preferably more than 98%. The reflective layer can diffusely reflect the incident light, allowing the excitation light to return to the wavelength conversion layer for excitation, thereby improving the excitation efficiency.

[0081] In some embodiments, when the stimulated light passes through the beam splitter / combiner element 12, the target stimulated light is directed towards the light recycling component. The target stimulated light is light whose wavelength coincides with the wavelength of the primary color light emitted from the second light source component 02 and whose polarization state is the first polarization state. The light recycling component reflects the target stimulated light back to the beam splitter / combiner element 12, and then through the beam splitter / combiner element 12 and the shaping lens group, it is directed towards the wavelength conversion device 16. The wavelength conversion device 16 emits a first stimulated light and a second stimulated light. The polarization state of the second stimulated light is the same as that of the target stimulated light, while the polarization state of the first stimulated light is different from that of the second stimulated light. The first stimulated light passes through the shaping lens group and the beam splitter / combiner element 12 and is directed towards the homogenizing element 23 for homogenization. The second stimulated light is transmitted through the beam splitter / combiner element 12 and then directed towards the light recycling component, and this cycle repeats. Therefore, when the beam splitter and combiner element 12 combines the primary color light and the excited light, it reflects some of the excited light that cannot enter the uniform light element 23 as the output light of the light source system to the wavelength conversion device 16 through the light reuse component. After being processed by the wavelength conversion device 16, it is sent back to the beam splitter and combiner element 12. Then, some of the light can be used as the output light of the light source system. This allows for cyclic processing, thereby improving the light combining efficiency and thus increasing the brightness of the projection device.

[0082] Optionally, the stimulated light from the target can undergo diffuse reflection when it is directed toward the wavelength conversion device 16, thereby altering the polarization state of a portion of the stimulated light. For example, if the surface of the phosphor is composed of rough particles, the stimulated light from the target will undergo diffuse reflection when it is directed toward the phosphor surface, thus changing the polarization state of a portion of the stimulated light.

[0083] Optional, such as Figure 1 As shown, the light reuse component can transmit the excitation light generated by the first light source component 01 and reflect the target excited light, thereby reflecting the excited light to the light splitting and combining element 12.

[0084] In some embodiments, the light-splitting and combining element 12 can transmit blue light of the first wavelength band, green light of the first polarization state of the second wavelength band, red light of the third wavelength band, or red light of the first polarization state of the third wavelength band, and reflect green light of the second polarization state of the second wavelength band and / or red light of the second polarization state of the third wavelength band, and light of other wavelength bands. The light of the second polarization state of the second wavelength band and / or the light of the second polarization state of the third wavelength band in the excited light, and light of other wavelength bands, are reflected by the light-splitting and combining element 12 and directed towards the light-uniforming element 23. The light-splitting and combining element 12 transmits the excitation light and the target excited light, the target excited light including light of the first polarization state of the second wavelength band and / or the light of the first polarization state of the third wavelength band in the excited light. The light-splitting and combining element 12 can be a single-sided or double-sided coated substrate. The first, second, and third wavelength bands are not limited; for example, the first wavelength band is 430-490 nm, the second wavelength band is 510-540 nm, and the third wavelength band is 625-680 nm. The second polarization state is not limited and can be either S-state or P-state. By combining the primary color light and the excited light through this beam splitter and combiner element 12, the beam combining efficiency can be improved, thereby increasing the brightness of the projection device.

[0085] For example, the excitation light is a blue laser, and the second light source component 02 emits blue laser, red laser, and green laser. The excited light includes green / yellow fluorescence and red / yellow fluorescence, and the first polarization state is P-state. The film coated on the light splitter and combiner element 12 can transmit blue light in the wavelength range of 430-490nm, P-state green light in the wavelength range of 510-540nm, and red light or P-state red light in the wavelength range of 625-680nm, while other wavelength ranges and polarization states of light are reflected. Assuming the wavelength conversion device 16 includes yellow phosphor in its conversion region, and the excited light is yellow fluorescence with a wavelength range of 500-680 nm, then the P-state light in the 510-540 nm range and the light in the 625-680 nm range, or the P-state red light in the 625-680 nm range, are transmitted through the light-splitting and combining element 12. The S-state light in the 510-540 nm range and / or the S-state red light in the 625-680 nm range are reflected by the light-splitting and combining element 12, and the light in other wavelength ranges is also reflected. That is, all the S-state fluorescence and 35% of the P-state fluorescence in the excited light (fluorescence) are reflected into the homogenizing element 23 as the output light of the light source system, and approximately 15% of the P-state fluorescence is transmitted out through the light-splitting and combining element 12. Therefore, the light reuse component can redirect the 15% P-state fluorescence back to the wavelength conversion device 16. Due to diffuse reflection, after reflection, the 15% P-state fluorescence will have approximately 7.5% S-state and 7.5% P-state. The 7.5% S-state is reflected by the beam splitter / combiner 12 into the homogenizer 23, while the 7.5% P-state will follow the same optical path as the previous P-state fluorescence and be redirected back to the wavelength conversion device 16, repeating this cycle. It should be noted that because the cycle converts all P-states in the fluorescence to S-states, if the subsequent spatial light modulator is set to a device such as an LCOS or LCD that requires polarization of the incident light, then polarization conversion elements such as PBS or PCS on the incident light side are not necessary, reducing the number of devices while maintaining high brightness.

[0086] Optionally, the excitation light is a blue laser, and the second light source component 02 emits blue and red lasers. The excited light includes green / yellow fluorescence and red / yellow fluorescence. The polarization states of the blue and red lasers are S-state or P-state. The wavelength ranges of the red laser and the red / yellow fluorescence do not overlap or partially overlap. The light splitter / combiner element 12 transmits the S-state and / or P-state blue and red lasers, transmits some P-state or S-state light in the red / green / yellow fluorescence, and reflects the light in other wavelength ranges and polarization states. For example, the film coated on the light splitter / combiner element 12 can transmit P-state and / or S-state blue light in the 440-485nm wavelength range and P-state and / or S-state red light in the wavelength range greater than 610nm and greater than 620nm, and reflect the light in other wavelength ranges. Assuming the stimulated light is yellow fluorescence with a wavelength range of 500-680nm, then the P-state light in the 610-620nm wavelength range of the yellow fluorescence is transmitted through the light splitter and combiner 12, the S-state light in the 610-620nm wavelength range is reflected by the light splitter and combiner 12, and the light in other wavelength ranges is also reflected. The stimulated light of the target includes the P-state light in the 610-620nm wavelength range.

[0087] Optionally, the distance between the wavelength conversion device 16 and the light splitting and combining element 12 is less than a preset distance. The preset distance can be customized according to the actual application, which can make the entire light source system smaller and more compact.

[0088] In some embodiments, a color filter element and a driving device are disposed between the wavelength conversion device 16 and the light splitting and combining element 12. Under a first preset condition, the driving device drives the color filter element to be located in the optical path of the stimulated light, thus filtering the stimulated light. Under a second preset condition, the driving device drives the color filter element to be located outside the optical path of the stimulated light. The first preset condition may be that the color gamut is detected to be lower than a minimum standard value (which may be a preset value in the projection device) or the projection device receives a color gamut instruction indicating that the user needs a better color gamut for the projected image. The second preset condition may be that the brightness is lower than a minimum standard value (which may be a preset value in the projection device) or the projection device receives a brightness instruction indicating that the user needs a better brightness for the projected image.

[0089] Optionally, a color filter element is provided between the wavelength conversion device 16 and the light splitting and combining element 12 to filter the stimulated light. That is, the color filter element can also be static, always located in the optical path to filter the stimulated light, thereby improving the color gamut of the light source system.

[0090] In some embodiments, the light reuse component may include, but is not limited to, the following implementations:

[0091] Method 1

[0092] like Figure 1As shown, the optical axis of the excitation light emitted from the first light source assembly 01 coincides with the optical axis of the first shaping lens group 15. The light reuse assembly is disposed between the first light source assembly 01 and the light splitting and combining element 12.

[0093] like Figure 1 As shown, assume that the first light source component 01 emits blue light; the second light source component 02 emits red light; and the excited light emitted by the wavelength conversion device 16 after being excited is green light.

[0094] The first beam splitter 51 can transmit a portion of the blue light and reflect the remainder. The blue light emitted from the first light source assembly 01 is split into excitation blue light and additional blue light by the first beam splitter 51, wherein the blue light transmitted by the first beam splitter 51 is the excitation blue light, and the blue light reflected by the first beam splitter 51 is the additional blue light.

[0095] Optionally, the first beam splitting element 51 may employ a partitioning method or a coating method to split the light emitted from the first light source assembly 01 into excitation light and additional light.

[0096] For example, the first beam splitter 51 includes a first partition and a second partition arranged in a partitioned manner. The first partition transmits light emitted from the first light source assembly 01 as excitation light, and the second partition reflects light emitted from the first light source assembly 01 as supplementary light.

[0097] For example, the first beam-splitting element 51 has a coating layer that partially transmits and partially reflects the light emitted from the first light source assembly 01. The transmitted light is the excitation light, and the reflected light is the auxiliary light. The coating characteristics of the coating layer are set to a% transmission and b% reflection for a certain wavelength band of light, where a+b=100.

[0098] For example, the first beam splitter 51 is a reflective element. The first beam splitter 51 partially blocks the light emitted from the first light source assembly 01 to split the light into excitation light and auxiliary light, wherein the light not blocked by the first beam splitter 51 is the excitation light, and the light blocked by the first beam splitter 51 and reflected is the auxiliary light.

[0099] The light source system described in this application embodiment further includes a first light combining component. The auxiliary light and the primary color light emitted from the second light source component 02 are combined by the first light combining component to form a combined beam. The combined beam is emitted to the light splitting and combining element 12 and guided by the light splitting and combining element 12 to the combined beam path for emission.

[0100] Specifically, the first light combining component includes a light-splitting filter element 52 and a first reflective element 53.

[0101] The beam-splitting filter element 52 transmits red light and reflects blue light.

[0102] The first reflective element 53 reflects red and blue light.

[0103] The blue supplementary light and the red light emitted from the second light source component 02 are respectively directed to the beam splitting filter element 52. The transmitted red light and the reflected blue light are combined into a single beam through the beam splitting filter element 52 to form a combined beam. Then, the combined beam is reflected by the first reflective element 53 and directed to the beam splitting and combining element 12. The blue supplementary light and the red light emitted from the second light source component 02 are transmitted from the beam splitting and combining element 12 and enter the combined beam path.

[0104] In this embodiment of the application, the light reuse component includes a fifth beam splitter 39 disposed between the first light source component 01 and the beam splitter and combiner 12. The fifth beam splitter 39 is provided with a beam splitting region. Optionally, the beam splitting region may be a through hole, a substrate coated with an anti-reflection film, or a dichroic lens.

[0105] For example, the beam-splitting region is a through-hole or a substrate coated with an anti-reflection film. The beam-splitting region transmits the excitation light emitted from the first light source component 01, while other regions except the beam-splitting region reflect residual excitation light and target excitation light.

[0106] Alternatively, the beam-splitting region is a dichroic lens, which transmits the excitation light emitted from the first light source component 01 and reflects the target excitation light, while other regions reflect the residual excitation light and the target excitation light.

[0107] The light splitter and combiner 12 transmits the excitation light (blue light) and residual excitation light (blue light), the primary color light (red light) emitted by the second light source assembly 02, and the target stimulated light (target green light), and reflects the portion of the stimulated light excluding the target stimulated light (non-target green light).

[0108] The excitation blue light is transmitted through the beam-splitting area of ​​the fifth beam-splitting element 39 and the beam-splitting and combining element 12, and then directed to the first shaping lens group 15. After being shaped by the first shaping lens group 15, it is directed to the wavelength conversion device 16. The wavelength conversion device 16 emits green light after being excited by the blue light, while a portion of the excitation blue light does not undergo excitation conversion and becomes residual blue light, which is reflected by the wavelength conversion device 16. Both the green light and the residual blue light are directed to the first shaping lens group 15, and after being shaped by the first shaping lens group 15, they are directed to the beam-splitting and combining element 12.

[0109] Assuming the excited light generated by the wavelength conversion device 16 has a wavelength range of 580-630nm, and the target excited light specifically refers to the P-state light of 610-620nm, the 610-620nm P-state light is transmitted through the beam splitter and combiner element 12. The portion of the light in the 580-630nm wavelength range excluding the 610-620nm P-state light is reflected and guided by the beam splitter and combiner element 12 to the combined light path for emission. Specifically, the S-state light in the 580-630nm wavelength range, as well as the S-state light in the 580-610nm and 620-630nm wavelength ranges, are reflected and guided by the beam splitter and combiner element 12 to the combined light path for emission.

[0110] The 610-620nm P-state light is transmitted through the beam splitter and combiner 12 and then directed to the fifth beam splitter 39. Reflected by the fifth beam splitter 39, it is transmitted back through the beam splitter and combiner 12 and the first shaping lens group 15 before reaching the wavelength conversion device 16. The 610-620nm P-state light is diffusely reflected by the wavelength conversion device 16 and then emitted, transforming into 610-620nm P-state light and 610-620nm S-state light. The 610-620nm S-state light is guided by the beam splitter and combiner 12 to the combined light path and emitted, while the 610-620nm P-state light is transmitted through the beam splitter and combiner 12 and reflected back to the wavelength conversion device 16 by the fifth beam splitter 39. This cycle repeats, thus achieving the recovery and reuse of the target excited light.

[0111] The residual blue light is transmitted through the beam splitter and combiner 12 and then directed to the fifth beam splitter 39. After being reflected by other areas outside the beam splitting area of ​​the fifth beam splitter 39, it is transmitted back through the beam splitter and combiner 12 and the first shaping lens group 15 and then directed to the wavelength conversion device 16 for cyclic re-excitation.

[0112] This method uses fewer components while ensuring high excitation and light-combining efficiencies. The light reuse component can simultaneously recover the excited light from the target and re-excite the residual excitation light, improving both light-combining and excitation efficiencies, thereby enhancing the luminous efficacy of the light source system.

[0113] In the above embodiments, this method is applicable to situations where the stimulated light generated by the wavelength conversion device 16 and the primary color light emitted by the second light source component 02 overlap in wavelength band. Specifically, for example, the stimulated light generated by the wavelength conversion device 16 has a wavelength range of 500-620 nm, while the primary color light emitted by the second light source component 02 includes red light (P-state light of 630-650 nm) and green light (P-state light of 540-560 nm). Therefore, 540-560 nm is the overlapping wavelength band, and the P-state light of 540-560 nm will be transmitted through the beam splitter and combiner element 12. Then, the green light emitted by the second light source component 02 enters the combined light path after being transmitted through the beam splitter and combiner element 12. The portion of the stimulated light (500-620nm) generated by the wavelength conversion device 16, excluding the target stimulated light (P-state light of 540-560nm), is reflected by the beam splitter and combiner element 12 to the beam combining path. The target stimulated light (P-state light of 540-560nm) in the stimulated light (500-620nm) generated by the wavelength conversion device 16 is lost when transmitted through the beam splitter and combiner element 12. In order to recover and reuse this part of the light and improve the output brightness, the target stimulated light (P-state light of 540-560nm) is reflected back by the fifth beam splitter element 39 for recovery and reuse. That is, the lost part of the stimulated light is recovered and reused through multiple reflections.

[0114] When the stimulated light generated by the wavelength conversion device 16 does not overlap with the primary color light emitted by the second light source component 02, the beam splitter and combiner element 12 has simpler transmission and reflection characteristics. That is, the beam splitter and combiner element 12 can transmit the excitation light (blue light), the residual excitation light (blue light), and the primary color light (red light), and reflect all the stimulated light (green light). For example, if the stimulated light generated by the wavelength conversion device 16 has a wavelength range of 500-580nm, and the primary color light emitted by the second light source component 02 only includes red light (P-state light of 630-650nm), then the beam splitter and combiner element 12 reflects all the stimulated light in the 500-580nm range so that all the stimulated light directly enters the combined light path, there is no loss or waste of the target stimulated light, and therefore no need to perform a target stimulated light recovery operation.

[0115] Method 2

[0116] The main difference between Method 2 and Method 1 lies in the different components of the light reuse assembly, such as... Figure 6 As shown, in Method 2, the light reuse component includes a target beam splitter 31, a first polarization conversion element 32, and a polarization separation element 33.

[0117] The target beam splitter 31 transmits the excitation light emitted from the first light source assembly 01 and the returned residual excitation light, and reflects the target excited light.

[0118] The first polarization conversion element 32 can be a quarter-wave plate.

[0119] The polarization separation element 33 can be a wire grid, a PBS, or a 0-degree polarizer that transmits P-state and reflects S-state light. The polarization separation element 33 transmits P-state blue light and reflects S-state blue light.

[0120] The main difference in the optical path is that the excitation light of the first polarization state emitted by the first light source component 01 passes through the polarization separation element 33 and the first polarization conversion element 32 when it is directed toward the wavelength conversion device 16.

[0121] For example, the first light source component 01 emits P-state blue light, and the excitation light separated by the first beam splitter 51 is P-state blue light.

[0122] The excitation light is transmitted through the polarization separating element 33, and then the excitation light undergoes a polarization state conversion under the action of the first polarization conversion element 32 to become circularly polarized or elliptically polarized. Then the excitation light is transmitted through the target beam splitting element 31 to the beam splitting and combining element 12. After passing through the beam splitting and combining element 12 and the first shaping lens group 15, the excitation light irradiates the wavelength conversion device 16. The wavelength conversion device 16 is irradiated by the excitation light and generates excited light, and reflects the unexcited and unconverted residual excitation light back.

[0123] After the residual excitation light is directed towards the light recycling component via the beam splitter and combiner element 12, the residual excitation light directed towards the light recycling component is either circularly polarized or elliptically polarized blue light. After being transmitted through the target beam splitter element 31, the residual excitation light exits to the first polarization conversion element 32. The residual excitation light undergoes a polarization state conversion again via the first polarization conversion element 32, transforming into S-state blue light. This S-state blue light is then reflected back by the polarization separation element 33. The residual excitation light then passes through the beam splitter and combiner element 12 and the first shaping lens group 15 before illuminating the wavelength conversion device 16, thus achieving the recovery and re-excitation of the residual blue light.

[0124] When the stimulated light generated by the wavelength conversion device 16 overlaps with the primary color light emitted by the second light source component 02, the transmission and reflection characteristics of the light splitting and combining element 12 are: transmitting the excitation light, residual excitation light, target stimulated light, and primary color light emitted by the second light source component 02, and reflecting the portion of the stimulated light excluding the target stimulated light.

[0125] For example, when the stimulated light generated by the wavelength conversion device 16 is emitted to the beam splitter and combiner 12, the portion of the stimulated light excluding the target stimulated light (S-state light in the 580-630nm wavelength range and P-state light in the 580-610nm and 620-630nm wavelength range) is reflected by the beam splitter and combiner 12 and emitted through the combined light path. Meanwhile, the target stimulated light (P-state light in the 610-620nm wavelength range) is transmitted through the beam splitter and combiner 12 to the target beam splitter 31, where it is reflected back. After transmission through the beam splitter and combiner 12 and the first shaping lens group 15, the target stimulated light... The light is directed toward the wavelength conversion device 16. Through diffuse reflection, a portion of the target-excited light (P-state light of 610-620nm) undergoes a polarization state conversion. The light reflected by the wavelength conversion device 16 includes both P-state light of 610-620nm and S-state light of 610-620nm. The S-state light of 610-620nm is reflected by the beam splitter and combiner 12 and guided to the beam combining path. The P-state light of 610-620nm is transmitted through the beam splitter and combiner 12 again and reflected back by the target beam splitter 31 to illuminate the wavelength conversion device 16 again. This cycle is repeated to achieve the recycling and reuse of the target-excited light.

[0126] Method 3

[0127] The main difference between Method 3 and Method 1 lies in the different components of the light reuse module, such as... Figure 7 As shown, in Method 3, the light reuse assembly includes a target beam splitter 31, a first polarization conversion element 32, a second beam splitter 331, and a fifth reflection element 332.

[0128] The target beam splitter 31 transmits the excitation light emitted from the first light source assembly 01 and the returned residual excitation light, and reflects the target excited light.

[0129] The first polarization conversion element 32 can be a quarter-wave plate.

[0130] The first beam splitter 331 can transmit blue light in a first polarization state and reflect blue light in a second polarization state, for example, it can transmit P-state blue light and reflect S-state blue light.

[0131] The fifth reflective element 332 can be a reflector, a substrate coated with a reflective film, a reflective diffuser, etc.

[0132] The main difference in the optical path is that the excitation light of the first polarization state emitted from the first light source component 01 passes through the second beam splitter 331 and the first polarization conversion element 32 when it is directed toward the wavelength conversion device 16.

[0133] For example, the first light source component 01 emits P-state blue light, and the excitation light separated by the first beam splitter 51 is P-state blue light. The excitation light is transmitted through the second beam splitter 331, and then, under the action of the first polarization conversion element 32, the excitation light undergoes a polarization state conversion to become circularly polarized or elliptically polarized light. Next, the excitation light is transmitted through the target beam splitter 31 to the beam combining element 12. After passing through the beam combining element 12 and the first shaping lens group 15, the excitation light illuminates the wavelength conversion device 16. The wavelength conversion device 16, illuminated by the excitation light, generates excited light and reflects the unexcited residual excitation light back. The residual excitation light, after passing through the beam combining element 12, is directed towards the light recycling component, at which point the residual excitation light directed towards the light recycling component is either circularly polarized or elliptically polarized blue light. The residual excitation light is transmitted from the target beam splitter 31 and then emitted to the first polarization conversion element 32. The residual excitation light undergoes a polarization state conversion again after passing through the first polarization conversion element 32, transforming into S-state blue light. The second beam splitter 331 reflects the residual excitation light (S-state blue light) to the fifth reflection element 332, which then reflects it back to the second beam splitter 331. The residual excitation light then passes through the first polarization conversion element 32, the target beam splitter 31, the beam splitter and combiner 12, and the first shaping lens group 15 before illuminating the wavelength conversion device 16, thus achieving the recovery and re-excitation of the residual blue light.

[0134] When the stimulated light generated by the wavelength conversion device 16 overlaps with the primary color light emitted by the second light source component 02, the transmission and reflection characteristics of the light splitting and combining element 12 are: transmitting the excitation light, residual excitation light, target stimulated light, and primary color light emitted by the second light source component 02, and reflecting the portion of the stimulated light excluding the target stimulated light.

[0135] For example, when the stimulated light generated by the wavelength conversion device 16 is emitted to the beam splitter and combiner 12, the portion of the stimulated light excluding the target stimulated light (S-state light in the 580-630nm wavelength range and P-state light in the 580-610nm and 620-630nm wavelength range) is reflected by the beam splitter and combiner 12 and emitted through the combined light path. Meanwhile, the target stimulated light (P-state light in the 610-620nm wavelength range) is transmitted through the beam splitter and combiner 12 to the target beam splitter 31, where it is reflected back. After transmission through the beam splitter and combiner 12 and the first shaping lens group 15, the target stimulated light... The light is directed toward the wavelength conversion device 16. Through diffuse reflection, a portion of the target-excited light (P-state light of 610-620nm) undergoes a polarization state conversion. The light reflected by the wavelength conversion device 16 includes both P-state light of 610-620nm and S-state light of 610-620nm. The S-state light of 610-620nm is reflected by the beam splitter and combiner 12 and guided to the beam combining path. The P-state light of 610-620nm is transmitted through the beam splitter and combiner 12 again and reflected back by the target beam splitter 31 to illuminate the wavelength conversion device 16 again. This cycle is repeated to achieve the recycling and reuse of the target-excited light.

[0136] Method 4

[0137] The main difference between Method 4 and Method 1 lies in the components and placement of the light recycling assembly, such as... Figure 8 As shown, the components in the light reuse assembly are arranged on at least two sides of the light splitting and combining element 12. The light reuse assembly includes a target light splitting element 31, a first polarization conversion element 32, and a third light splitting element 40.

[0138] The target beam splitter 31 transmits the excitation light emitted from the first light source assembly 01 and reflects the target excitation light.

[0139] The light splitter and combiner 12 transmits the excitation light, the target stimulated light, and the primary color light emitted from the second light source assembly 02, and reflects the residual excitation light and the portion of the stimulated light excluding the target stimulated light (non-target green light).

[0140] The first polarization conversion element 32 can be a quarter-wave plate.

[0141] The third beam splitter 40 transmits light of the first polarization state and reflects light of the second polarization state, for example, it transmits P-state light and reflects S-state light.

[0142] The main difference in the optical path is that, for example, the first light source component 01 emits P-state blue light, and the excitation light separated by the first beam splitter 51 is P-state blue light.

[0143] The excitation light is transmitted through the target beam splitter 31 and the beam splitter and combiner 12. Then, under the action of the first polarization conversion element 32, the excitation light undergoes a polarization state conversion and is transformed into a circularly polarized light state or an elliptically polarized light state. After passing through the first shaping lens group 15, the excitation light irradiates the wavelength conversion device 16. The wavelength conversion device 16 is irradiated by the excitation light and generates excited light, and reflects the unexcited and unconverted residual excitation light back.

[0144] The residual excitation light is shaped by the first shaping lens group 15 and then directed to the first polarization conversion element 32. The residual excitation light is then converted to S-state blue light by the first polarization conversion element 32. The residual excitation light (S-state blue light) is reflected by the beam splitter and combiner 12 and directed to the third beam splitter 40 and reflected back. It is then reflected again by the beam splitter and combiner 12 and then passes through the first polarization conversion element 32 and the first shaping lens group 15 before illuminating the wavelength conversion device 16, thus realizing the recovery and re-excitation of the residual blue light.

[0145] When the stimulated light generated by the wavelength conversion device 16 overlaps with the primary color light emitted by the second light source component 02, the transmission and reflection characteristics of the light splitting and combining element 12 are: transmitting the excitation light, the target stimulated light, and the primary color light emitted by the second light source component 02, and reflecting the residual excitation light and the portion of the stimulated light excluding the target stimulated light.

[0146] For example, when the stimulated light generated by the wavelength conversion device 16 is emitted to the beam splitter and combiner 12, the portion of the stimulated light excluding the target stimulated light (S-state light in the 580-630nm wavelength range and P-state light in the 580-610nm and 620-630nm wavelength range) is reflected by the beam splitter and combiner 12 and emitted through the combined light path. Meanwhile, the target stimulated light (P-state light in the 610-620nm wavelength range) is transmitted through the beam splitter and combiner 12 to the target beam splitter 31, where it is reflected back. After transmission through the beam splitter and combiner 12 and the first shaping lens group 15, the target stimulated light... The light is directed toward the wavelength conversion device 16. Through diffuse reflection, a portion of the target-excited light (P-state light of 610-620nm) undergoes a polarization state conversion. The light reflected by the wavelength conversion device 16 includes both P-state light of 610-620nm and S-state light of 610-620nm. The S-state light of 610-620nm is reflected by the beam splitter and combiner 12 and guided to the beam combining path. The P-state light of 610-620nm is transmitted through the beam splitter and combiner 12 again and reflected back by the target beam splitter 31 to illuminate the wavelength conversion device 16 again. This cycle is repeated to achieve the recycling and reuse of the target-excited light.

[0147] Method 5

[0148] The main difference between Method 5 and Method 4 lies in the different components of the light reuse module, such as... Figure 9 As shown, in Method 5, the light reuse assembly includes a target beam splitter 31, a first polarization conversion element 32, a fourth beam splitter 41, and a sixth reflection element 42.

[0149] The fourth beam splitter 41 transmits blue light in the first polarization state and reflects blue light in the second polarization state, for example, it transmits P-state light and reflects S-state light.

[0150] The main difference in the optical path is that, for example, the first light source component 01 emits P-state blue light, and the excitation light separated by the first beam splitter 51 is P-state blue light.

[0151] The excitation light is transmitted through the target beam splitter 31 and the beam splitter and combiner 12. Then, under the action of the first polarization conversion element 32, the excitation light undergoes a polarization state conversion and is transformed into a circularly polarized light state or an elliptically polarized light state. After passing through the first shaping lens group 15, the excitation light irradiates the wavelength conversion device 16. The wavelength conversion device 16 is irradiated by the excitation light and generates excited light, and reflects the unexcited and unconverted residual excitation light back.

[0152] The residual excitation light is shaped by the first shaping lens group 15 and then directed to the first polarization conversion element 32. The residual excitation light is again converted to S-state blue light by the first polarization conversion element 32. The residual excitation light (S-state blue light) is reflected by the beam splitter and combiner element 12 and directed to the fourth beam splitter element 41. The residual excitation light (S-state blue light) is reflected by the fourth beam splitter element 41 and directed to the sixth reflecting element 42, and then reflected back. It is then reflected again by the fourth beam splitter element 41 and the beam splitter and combiner element 12, and after passing through the first polarization conversion element 32 and the first shaping lens group 15, it illuminates the wavelength conversion device 16, thus achieving the recovery and re-excitation of the residual blue light.

[0153] When the stimulated light generated by the wavelength conversion device 16 overlaps with the primary color light emitted by the second light source component 02, the transmission and reflection characteristics of the light splitting and combining element 12 are: transmitting the excitation light, the target stimulated light, and the primary color light emitted by the second light source component 02, and reflecting the residual excitation light and the portion of the stimulated light excluding the target stimulated light.

[0154] For example, when the stimulated light generated by the wavelength conversion device 16 is emitted to the beam splitter and combiner 12, the portion of the stimulated light excluding the target stimulated light (S-state light in the 580-630nm wavelength range and P-state light in the 580-610nm and 620-630nm wavelength range) is reflected by the beam splitter and combiner 12 and emitted through the combined light path. Meanwhile, the target stimulated light (P-state light in the 610-620nm wavelength range) is transmitted through the beam splitter and combiner 12 to the target beam splitter 31, where it is reflected back. After transmission through the beam splitter and combiner 12 and the first shaping lens group 15, the target stimulated light... The light is directed toward the wavelength conversion device 16. Through diffuse reflection, a portion of the target-excited light (P-state light of 610-620nm) undergoes a polarization state conversion. The light reflected by the wavelength conversion device 16 includes both P-state light of 610-620nm and S-state light of 610-620nm. The S-state light of 610-620nm is reflected by the beam splitter and combiner 12 and guided to the beam combining path. The P-state light of 610-620nm is transmitted through the beam splitter and combiner 12 again and reflected back by the target beam splitter 31 to illuminate the wavelength conversion device 16 again. This cycle is repeated to achieve the recycling and reuse of the target-excited light.

[0155] Method Six

[0156] The main differences between Method 6 and Method 1 are as follows: First, the optical axis of the excitation light emitted from the first light source assembly 01 is offset from the optical axis of the first shaping lens group 15; second, the constituent elements of the light reuse assembly are different.

[0157] like Figure 10 As shown, the light reuse assembly includes a target beam splitter 31 and a seventh reflector 37.

[0158] The target beam splitter 31 transmits the excitation light emitted from the first light source assembly 01 and reflects the target excitation light.

[0159] The seventh reflecting element 37 reflects the residual excitation light and can be a small mirror.

[0160] The main difference in the optical path is that, for example, the first light source component 01 emits blue light, and the excitation light separated by the first beam splitter 51 is blue light.

[0161] The excitation light is transmitted through the target beam splitter 31 and the beam splitter and combiner 12. Then, the excitation light passes through the first shaping lens group 15 and irradiates the wavelength conversion device 16. The wavelength conversion device 16 is irradiated by the excitation light and generates excited light, and reflects the unexcited residual excitation light back.

[0162] The residual excitation light is shaped by the first shaping lens group 15 and then directed to the beam splitter and combiner element 12. After being transmitted through the beam splitter and combiner element 12, it is reflected back by the seventh reflecting element 37. The residual excitation light then passes through the beam splitter and combiner element 12 and the first shaping lens group 15 again and then shines on the wavelength conversion device 16, realizing the recovery and re-excitation of the residual blue light.

[0163] Optionally, the optical axis of the seventh reflective element 37 is symmetrical with respect to the optical axis of the excitation light emitted from the first light source assembly 01 relative to the optical axis of the first shaping lens group 15. This allows the seventh reflective element 37 to reflect as much of the residual excitation light as possible back to the light splitting and combining element 12, thereby improving the re-excitation efficiency and increasing the luminous flux gain of the excited light emitted from the light source system by 6% to 13%.

[0164] Optionally, the long side of the seventh reflective element 37 is greater than or equal to the long axis of the residual excitation light spot, and the short side of the seventh reflective element 37 is greater than or equal to the short axis of the residual excitation light spot. By controlling the size of the seventh reflective element 37, the volume of the light source system can be reduced while reflecting the residual excitation light as much as possible.

[0165] When the stimulated light generated by the wavelength conversion device 16 overlaps with the primary color light emitted by the second light source component 02, the transmission and reflection characteristics of the light splitting and combining element 12 are: transmitting the excitation light, residual excitation light, target stimulated light, and primary color light emitted by the second light source component 02, and reflecting the portion of the stimulated light excluding the target stimulated light.

[0166] For example, when the stimulated light generated by the wavelength conversion device 16 is emitted to the beam splitter and combiner 12, the portion of the stimulated light excluding the target stimulated light (S-state light in the 580-630nm wavelength range and P-state light in the 580-610nm and 620-630nm wavelength range) is reflected by the beam splitter and combiner 12 and emitted through the combined light path. Meanwhile, the target stimulated light (P-state light in the 610-620nm wavelength range) is transmitted through the beam splitter and combiner 12 to the target beam splitter 31, where it is reflected back. After transmission through the beam splitter and combiner 12 and the first shaping lens group 15, the target stimulated light... The light is directed toward the wavelength conversion device 16. Through diffuse reflection, a portion of the target-excited light (P-state light of 610-620nm) undergoes a polarization state conversion. The light reflected by the wavelength conversion device 16 includes both P-state light of 610-620nm and S-state light of 610-620nm. The S-state light of 610-620nm is reflected by the beam splitter and combiner 12 and guided to the beam combining path. The P-state light of 610-620nm is transmitted through the beam splitter and combiner 12 again and reflected back by the target beam splitter 31 to illuminate the wavelength conversion device 16 again. This cycle is repeated to achieve the recycling and reuse of the target-excited light.

[0167] Method Seven

[0168] The main difference between Method 7 and Method 6 lies in the different components of the light recycling assembly. For example... Figure 11 As shown, the light reuse assembly includes a target reflective element 38. The target reflective element 38 includes a target area that reflects residual excitation light, while other areas transmit excitation light emitted from the first light source assembly 01 and reflect the target excitation light. The target area can be a total internal reflection area, such as a reflector.

[0169] The main difference in the optical path is that, for example, the first light source component 01 emits blue light, and the excitation light separated by the first beam splitter 51 is blue light.

[0170] The excitation light is transmitted through the target reflective element 38 to the beam splitter and combiner 12 after passing through the beam splitter and combiner 12 and the first shaping lens group 15. The excitation light then shines on the wavelength conversion device 16 after passing through the beam splitter and combiner 12 and the first shaping lens group 15. The wavelength conversion device 16 is irradiated by the excitation light and generates excited light, and reflects the unexcited and unconverted residual excitation light back.

[0171] The residual excitation light is shaped by the first shaping lens group 15 and then directed towards the beam splitter and combiner element 12. After being transmitted through the beam splitter and combiner element 12, it is reflected back to the target area of ​​the target reflector element 38. The residual excitation light then passes through the beam splitter and combiner element 12 and the first shaping lens group 15 again and then irradiates the wavelength conversion device 16, realizing the recovery and re-excitation of the residual blue light.

[0172] When the stimulated light generated by the wavelength conversion device 16 overlaps with the primary color light emitted by the second light source component 02, the transmission and reflection characteristics of the light splitting and combining element 12 are: transmitting the excitation light, residual excitation light, target stimulated light, and primary color light emitted by the second light source component 02, and reflecting the portion of the stimulated light excluding the target stimulated light.

[0173] For example, when the stimulated light generated by the wavelength conversion device 16 is emitted to the beam splitter and combiner element 12, the portion of the stimulated light excluding the target stimulated light (S-state light in the 580-630nm wavelength range and P-state light in the 580-610nm and 620-630nm wavelength range) is reflected by the beam splitter and combiner element 12 and emitted through the combined light path. Meanwhile, the target stimulated light (P-state light in the 610-620nm wavelength range) is transmitted through the beam splitter and combiner element 12 to other regions of the target reflector element 38 besides the target region. The target stimulated light is reflected back by the target reflector element 38 from these other regions. The target stimulated light then passes through the beam splitter and combiner element 12 and the first shaping lens. After being transmitted through group 15, the light is directed towards wavelength conversion device 16. Through diffuse reflection, a portion of the target-excited light (P-state light of 610-620nm) undergoes polarization state conversion. The light reflected by wavelength conversion device 16 includes P-state light of 610-620nm and S-state light of 610-620nm. The S-state light of 610-620nm is reflected by beam splitter and combiner element 12 and guided to the beam combining path. The P-state light of 610-620nm is transmitted again through beam splitter and combiner element 12 and reflected by target reflector element 38 in areas other than the target area to irradiate wavelength conversion device 16 again. This cycle repeats to achieve the recycling and reuse of target-excited light.

[0174] In methods one through seven, the light reuse component can simultaneously recover fluorescence (excited light) and re-excite blue light (residual excitation light), improving the light combining efficiency and excitation efficiency, thereby improving the luminous efficacy of the light source system.

[0175] As an alternative implementation, the wavelength conversion device 16 also includes a transmission region, and the light source system also includes a reflection guiding component.

[0176] The reflection guiding component is used to guide the excitation light transmitted through the transmission area of ​​the wavelength conversion device 16 to the uniform light element 23, so as to be emitted as the excitation light of the light source system. That is, after the excitation light is emitted, it has a different optical path from the residual excitation light after passing through the wavelength conversion device 16. It can make full use of the residual excitation light for re-excitation light, and can also use the excitation light as the emitted light, which can improve the brightness of the projection device.

[0177] For example, such as Figure 12 As shown, in method one Figure 1 Based on the structure shown. Figure 12 The structure shown mainly adds a second reflective element 54, a third reflective element 55, and a light combining element 56. The second reflective element 54 and the third reflective element 55 reflect the excitation light (blue light). The light combining element 56 transmits the additional excitation light (blue light), the non-target stimulated light (green light), and the primary color light (red light), and reflects the excitation light (blue light).

[0178] Figure 12 In the structure shown, the wavelength conversion device 16 is a dynamic fluorescent wheel with a fluorescent region and a light-transmitting region, and the positions of the fluorescent region and the light-transmitting region change over time.

[0179] At time T1, blue light is excited and directed towards the fluorescent region, interacting with... Figure 1 The optical path principle of the structure shown is the same, with the fluorescent region emitting green excited light and residual blue light. The target green light is reflected back to the wavelength conversion device 16 by the fifth beam splitter 39. After diffuse reflection by the wavelength conversion device 16, the emitted green light includes both the target green light and non-target green light. The non-target green light, the additional blue light, and the red light emitted from the second light source component 02 are transmitted through the beam splitter and combiner 12 and guided to the beam combiner 56. After beam combining by the beam combiner 56, the light is emitted along the beam combiner path. The residual blue light subsequently re-excites the wavelength conversion device 16.

[0180] At time T2, the excitation blue light is directed towards the light-transmitting region. After transmission through the light-transmitting region, the excitation blue light is directed towards the second reflective element 54, reflected and guided by the second reflective element 54 to the third reflective element 55, reflected and guided by the third reflective element 55 to the light-combining element 56, and reflected by the light-combining element 56 before exiting along the combined light path. At this time, the wavelength conversion device 16 is not excited, so it will not emit green excited light or residual blue light, and therefore there is no longer any residual blue light to align for re-excitation.

[0181] Therefore, the embodiments of this application can perform time-sequential light combining.

[0182] In methods two through seven, the wavelength conversion device 16 can also be adjusted to a dynamic fluorescent wheel with a fluorescent region and a light-transmitting region, and a reflection guiding component can be added accordingly to the light source system to achieve the above purpose.

[0183] In summary, the light source system provided in this application, when the beam splitter and combiner element 12 combines the primary color light and the excited light, reflects some of the excited light that cannot enter the homogenizing element 23 as the output light of the light source system to the wavelength conversion device 16 through the light recycling component. After being processed by the wavelength conversion device 16, it is then directed back to the beam splitter and combiner element 12, so that a portion of the light can be used as the output light of the light source system. This allows for cyclic processing, thereby improving the light combining efficiency and thus increasing the brightness of the projection device. Furthermore, the combined light of the excited light and the primary color light emitted from the second light source component 02 reduces problems such as speckle, color fringing, ghosting, and color unevenness. In addition, when the wavelength conversion device 16 is excited, some excitation light remains. The light recycling component can redirect the remaining excitation light back to the wavelength conversion device 16 for re-excitation, which can improve the fluorescence excitation efficiency and thus improve the light efficiency of the projection device.

[0184] This application also describes a projection device. For example... Figure 13As shown, the projection device includes an image processor 101 and a projection optical engine 102.

[0185] The image processor 101 can be a microcontroller, a dedicated image processing chip, etc. The microcontroller can be an ARM chip, a microcontroller unit (MCU), etc. The dedicated image processing chip can be an image signal processor (ISP), a graphics processing unit (GPU), an embedded neural network processing unit (NPU), etc. The image processor 101 can be used for video decoding, image quality processing, etc.

[0186] The projection optical engine 102 may include a spatial light modulator, a driving chip, and the light source system described in the above embodiments. The spatial light modulator may be a digital micromirror device (DMD), a liquid crystal display (LCD), or a liquid crystal on silicon (LCOS), etc. The driving chip corresponds to the spatial light modulator; for example, the digital micromirror device may be driven by a digital light processing (DLP) element. The projection optical engine 102 is used to project the image to be projected into a projection screen.

[0187] In some embodiments, the projection device further includes a central controller 103 with one or more processing cores, which may be a CPU, ARM, MCU, or other controller. The central controller 103 is the control center of the projection device, connecting various parts of the entire projection device via various interfaces and lines. It can run or execute software programs and / or operating systems stored in the memory 104, and access data stored in the memory 104. Optionally, the image processor 101 and the central controller 103 may be integrated into a single processor.

[0188] In some embodiments, the projection device further includes a memory 104, an input module 105, a communication module 106, a power supply 107, and other components of one or more computer-readable storage media. Those skilled in the art will understand that... Figure 13 The projection device structure shown does not constitute a limitation on the projection device and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein:

[0189] The memory 104 can be used to store software programs and operating systems. The central controller 103 executes various functional applications and data processing by running the software programs and operating systems stored in the memory 104. The memory 104 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the projection device, etc. In addition, the memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 104 may also include a memory controller to provide the central controller 103 with access to the memory 104.

[0190] The projection device may also include an input module 105, which can be used to receive input digital or character information, and generate remote control, keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0191] The projection device may also include a communication module 106. In some embodiments, the communication module 106 may include a wireless module, through which the projection device can perform short-range wireless transmission, thereby providing users with wireless broadband internet access. For example, the communication module 106 can be used to help users access streaming media.

[0192] The projection device also includes a power supply 107 that supplies power to the various components. In some embodiments, the power supply 107 can be logically connected to the central controller 103 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 107 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

Claims

1. A light source system, characterized in that: It includes a first light source assembly (01), a first beam splitter (51), a light recycling assembly, a second light source assembly (02), a beam splitter and beam combiner (12), a first shaping lens group (15), and a wavelength conversion device (16); The light reuse component is disposed between the first light source component (01) and the light splitting and combining element (12), or the elements in the light reuse component are disposed on at least both sides of the light splitting and combining element (12); The light emitted from the first light source assembly (01) is split into excitation light and additional light by the first beam splitting element (51); The excitation light is directed to the wavelength conversion device (16) after passing through the light splitting and combining element (12) and the first shaping lens group (15); or, the excitation light is directed to the wavelength conversion device (16). The wavelength conversion device (16) emits light after being excited by the excitation light, which includes excited light and residual excitation light. Both the excited light and the residual excitation light are directed toward the first shaping lens group (15). The stimulated light is shaped by the first shaping lens group (15) and then directed to the beam splitting and combining element (12), and is guided by the beam splitting and combining element (12) to exit the beam combining path; The residual excitation light is shaped by the first shaping lens group (15) and then directed to the light splitting and combining element (12) and the light reuse component. After being directed to the wavelength conversion device (16) by the light reuse component and the light splitting and combining element (12), it can be re-excited. The second light source component (02) emits at least one primary color light; The additional light and the primary color light are guided by the beam splitter and beam combiner (12) to the beam combiner path for emission.

2. The light source system as described in claim 1, characterized in that: The first beam splitter (51) includes a first partition and a second partition arranged in a partitioned manner. The first partition transmits light emitted from the first light source assembly (01), and the second partition reflects light emitted from the first light source assembly (01). Alternatively, the first beam splitter (51) has a coating layer that partially transmits and partially reflects the light emitted from the first light source assembly (01); Alternatively, the first beam splitter (51) is a reflective element, and the first beam splitter (51) partially blocks the light emitted from the first light source assembly (01) to split the excitation light and the additional light.

3. The light source system as described in claim 1, characterized in that: If the optical axis of the excitation light emitted by the first light source assembly (01) coincides with the optical axis of the first shaping lens group (15), the light reuse assembly is disposed between the first light source assembly (01) and the light splitting and combining element (12). The light reuse assembly includes a first polarization conversion element (32) and a polarization separation element (33); the excitation light emitted from the first light source assembly (01) is in a first polarization state; the excitation light in the first polarization state emitted from the first light source assembly (01) passes through the polarization separation element (33) and the first polarization conversion element (32) when it is directed toward the wavelength conversion device (16); the residual excitation light is directed toward the light reuse assembly through the light splitting and combining element (12), then passes through the first polarization conversion element (32) and then through the polarization separation element (33). The polarization state of the residual excitation light after passing through the first polarization conversion element (32) twice is converted to a second polarization state. The residual excitation light in the second polarization state is reflected by the polarization separation element (33) and then directed toward the first polarization conversion element (32). After passing through the first polarization conversion element (32) and the light splitting and combining element (12), it can be directed toward the wavelength conversion device (16) again for re-excitation. Alternatively, the light reuse assembly includes a first polarization conversion element (32), a second beam splitter (331), and a fifth reflector (332); the polarization state of the excitation light emitted from the first light source assembly (01) is a first polarization state; after the residual excitation light is directed to the light reuse assembly via the beam splitter and combiner (12), it first passes through the first polarization conversion element (32) and then through the second beam splitter (331). The polarization state of the residual excitation light after passing through the first polarization conversion element (32) twice is converted to a second polarization state. The residual excitation light in the second polarization state is reflected by the second beam splitter (331) and then directed to the fifth reflector (332). It is reflected back to the second beam splitter (331) by the fifth reflector (332), and then reflected again by the second beam splitter (331) and directed to the first polarization conversion element (32). After passing through the first polarization conversion element (32) and the beam splitter and combiner (12), it can be directed to the wavelength conversion device (16) again for re-excitation.

4. The light source system as described in claim 1, characterized in that: If the optical axis of the excitation light emitted by the first light source assembly (01) is offset from the optical axis of the first shaping lens group (15), then the light reuse assembly includes a seventh reflecting element (37). The residual excitation light is directed by the light splitter and combiner (12) to the seventh reflector (37), and the seventh reflector (37) reflects the residual blue light back to the light splitter and combiner (12), and then directs it again to the wavelength conversion device (16) for re-excitation.

5. A light source system as described in claim 4, characterized in that: The optical axis of the seventh reflective element (37) is symmetrical with respect to the optical axis of the excitation light emitted from the first light source assembly (01) relative to the optical axis of the first shaping lens group (15). And / or, the long side of the seventh reflective element (37) is greater than or equal to the long axis of the residual excitation light spot, and the short side of the seventh reflective element (37) is greater than or equal to the short axis of the residual excitation light spot.

6. A light source system as described in claim 1, characterized in that: The components in the light reuse assembly are disposed on at least two sides of the light splitting and combining element (12); the excitation light emitted from the first light source assembly (01) is in a first polarization state; the light splitting and combining element (12) transmits the excitation light in the first polarization state and reflects the excitation light in the second polarization state. The light reuse assembly includes a first polarization conversion element (32) and a third beam splitter (40); the excitation light of the first polarization state emitted from the first light source assembly (01) passes through the first polarization conversion element (32) when it is directed toward the wavelength conversion device (16); the residual excitation light is directed toward the first polarization conversion element (32) through the first shaping lens group (15), and the polarization state of the residual excitation light after passing through the first polarization conversion element (32) twice is converted to the second polarization state, and the residual excitation light of the second polarization state is directed toward the beam splitter and combiner (12), and then... After being reflected by the beam splitter and combiner (12), the light is directed toward the third beam splitter (40), and then reflected back to the beam splitter and combiner (12). After passing through the beam splitter and combiner (12) and the first polarization conversion element (32), the light can be directed toward the wavelength conversion device (16) again for re-excitation. The third beam splitter (40) can transmit light of the first polarization state and reflect light of the second polarization state, or the third beam splitter (40) can reflect light whose main wavelength is the target wavelength. The main wavelength of the excitation light emitted from the first light source assembly (01) is the target wavelength. Alternatively, the light reuse assembly includes a first polarization conversion element (32), a fourth beam splitter (41), and a sixth reflector (42); the excitation light of the first polarization state emitted from the first light source assembly (01) passes through the first polarization conversion element (32) when it is directed toward the wavelength conversion device (16); the residual excitation light is directed toward the first polarization conversion element (32) through the first shaping lens group (15), and the polarization state of the residual excitation light after passing through the first polarization conversion element (32) twice is converted to the second polarization state, and the residual light of the second polarization state... The excitation light is directed toward the beam splitter / combiner (12), reflected by the beam splitter / combiner (12), directed toward the fourth beam splitter (41), reflected by the fourth beam splitter (41), directed toward the sixth reflector (42), reflected back to the fourth beam splitter (41) by the sixth reflector (42), reflected again by the fourth beam splitter (41), directed toward the beam splitter / combiner (12), and then, through the beam splitter / combiner (12) and the first polarization conversion element (32), directed toward the wavelength conversion device (16) for re-excitation.

7. A light source system as described in claim 1, characterized in that: When the stimulated light passes through the light splitting and combining element (12), the target stimulated light is directed toward the light reuse component. The target stimulated light is light whose wavelength coincides with the wavelength of the primary color light emitted by the second light source component (02) and whose polarization state is the first polarization state. The light reuse component reflects the target excited light back to the light splitter and combiner (12), and then directs it through the light splitter and combiner (12) and the first shaping lens group (15) to the wavelength conversion device (16). The first stimulated light and the second stimulated light are emitted from the wavelength conversion device (16); the polarization state of the second stimulated light is the same as that of the target stimulated light, and the polarization state of the first stimulated light is different from that of the second stimulated light; the first stimulated light is directed to the beam splitter and combiner (12) after passing through the first shaping lens group (15), and is guided by the beam splitter and combiner (12) to the beam combining path for emission; the second stimulated light is transmitted through the beam splitter and combiner (12) and is directed to the light reuse component, and this cycle is repeated.

8. A light source system as described in claim 7, characterized in that: The light reuse assembly includes a target beam splitter (31); The target beam splitter (31) transmits the excitation light emitted from the first light source assembly (01) and reflects the target excited light; Alternatively, the target beam splitter (31) transmits the excitation light and residual excitation light emitted from the first light source assembly (01) and reflects the target excited light.

9. A light source system as described in claim 7, characterized in that: The optical axis of the excitation light emitted from the first light source assembly (01) is offset from the optical axis of the first shaping lens group (15); the light reuse assembly includes a target reflective element (38); the target reflective element (38) includes a target area, which reflects residual excitation light; other areas of the target reflective element (38) transmit the excitation light emitted from the first light source assembly (01) and reflect the target excited light; Alternatively, the optical axis of the excitation light emitted by the first light source assembly (01) coincides with the optical axis of the first shaping lens group (15); the light reuse assembly includes a fifth beam splitting element (39), the fifth beam splitting element (39) includes a beam splitting region, the beam splitting region being a through hole, a substrate coated with an anti-reflection film, or a dichroic lens; The beam-splitting region transmits the excitation light emitted from the first light source component (01), while other regions reflect the residual excitation light and the target excited light; Alternatively, the beam-splitting region transmits the excitation light emitted from the first light source component (01) and reflects the target excited light; other regions reflect the residual excitation light and the target excited light.

10. A light source system as described in claim 1, characterized in that: The wavelength conversion device (16) includes at least one conversion zone, each conversion zone corresponds to a type of stimulated light, and a filter element is provided on the light-emitting side of each conversion zone to filter the corresponding stimulated light; And / or, the wavelength conversion device (16) further includes a transmission region, and the light source system further includes a reflection guiding component, which is used to guide the excitation light transmitted through the transmission region to the combined light path for emission.

11. A light source system as described in claim 1, characterized in that: The wavelength conversion device (16) is one of a dynamic fluorescent wheel, a static fluorescent sheet, and a CGLED.

12. A light source system as described in claim 1, characterized in that: The additional light and the primary color light emitted by the second light source component (02) are combined into a beam by the first light combining component. The beam is emitted to the light splitting and combining element (12) and guided by the light splitting and combining element (12) to the light combining path.

13. A projection device, characterized in that, The light source system included in any one of claims 1-12.

Images