Light source system and projection equipment

Abstract

The invention relates to the technical field of display, and discloses a light source system and projection equipment, when a light splitting and combining element in the light source system combines primary light and excited light, part of excited light which cannot enter a dodging element and serves as emergent light of the light source system is reflected to a wavelength conversion device through a light reutilization assembly, and the light splitting and combining element is used for combining the primary light and the excited light. After being processed by the wavelength conversion device, the excited light enters the light splitting and combining element again, and part of the light can be used as emergent light of the light source system, so that circular processing can be realized, the light combining efficiency is improved, the brightness of the projection equipment is improved, and the excited light and the primary light emitted by the second light source assembly are combined and then emitted, so that the brightness of the projection equipment is improved. And the problems of speckles, color edge ghosting and uneven color can be weakened.

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 spatial light modulator.

[0003] Laser light sources, currently the primary light source for 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 laser-excited fluorescence and then combining it with the laser light is a common technique to supplement brightness and reduce laser speckle. However, currently, the combining efficiency of laser and fluorescence is relatively low when using laser-excited fluorescence. Summary of the Invention

[0004] This application provides a light source system that can be used in projection equipment, which improves light combining efficiency, thereby increasing the brightness of the projection equipment, and can reduce problems such as speckle, color fringing, ghosting, and color unevenness.

[0005] In a first aspect, this application provides a light source system, comprising a first light source component, a second light source component, a light splitting and combining element, a wavelength conversion device, a light recycling component, a shaping lens group, and a light homogenizing element. The first light source component is capable of emitting excitation light, and the second light source component is capable of emitting at least one primary color light; wherein:

[0006] The primary color light emitted from the second light source component is injected into the light homogenizing element after passing through the light splitting and combining element, and is then emitted after being homogenized by the light homogenizing element.

[0007] The excitation light emitted from the first light source component is incident on the wavelength conversion device via the light splitting and combining element and the shaping lens group, or the excitation light emitted from the first light source component is incident on the wavelength conversion device; when the wavelength conversion device is excited by the incident excitation light, the light emitted from the wavelength conversion device includes the excited light, the excited light is incident on the shaping lens group, and is incident on the light splitting and combining element via the shaping lens group.

[0008] The target stimulated light is transmitted through a beam splitter and combiner and then enters a light recycling component. The light recycling component reflects the target stimulated light back to the beam splitter and combiner, and then through the beam splitter and combiner and a shaping lens group into a wavelength conversion device. From the wavelength conversion device, a first stimulated light and a second stimulated light are emitted. 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 and combiner and then enters a homogenizing element for homogenization. The second stimulated light is transmitted through the beam splitter and combiner and then enters the light recycling component. This cycle repeats. The target stimulated light is the light whose wavelength overlaps with the primary color light emitted from the second light source component and whose polarization state is the same.

[0009] The remaining excited light in the excited light is injected into the homogenizing element through the light splitting and combining element, and then emitted after being homogenized by the homogenizing element.

[0010] In some embodiments,

[0011] When the wavelength conversion device is excited by the incident excitation light, the light emitted from the wavelength conversion device also includes residual excitation light. The residual excitation light is directed towards the shaping lens group, and after being shaped by the shaping lens group, it is sent into the light splitting and combining element and the light reuse component. The light reuse component and the light splitting and combining element enable the residual excitation light to be sent back into the wavelength conversion device for re-excitation.

[0012] In some embodiments, if the optical axis of the excitation light emitted by the first light source assembly coincides with the optical axis of the shaping lens group, then the polarization state of the excitation light emitted by the first light source assembly is the first polarization state; the light reuse assembly is disposed between the first light source assembly and the light splitting and combining element.

[0013] The light recycling assembly includes a first polarization conversion element and a polarization separation element. The excitation light of the first polarization state emitted from the first light source assembly passes through the polarization separation element and the first polarization conversion element when it enters the wavelength conversion device. The residual excitation light enters the light recycling assembly through the light splitting and combining element, then passes through the first polarization conversion element and then enters the polarization separation element. 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 reflected by the polarization separation element and then enters the first polarization conversion element. After passing through the first polarization conversion element and the light splitting and combining element, it can enter the wavelength conversion device again for re-excitation.

[0014] Alternatively, the light reuse assembly includes a first polarization conversion element, a first beam splitter, and a second reflection element. The excitation light of the first polarization state emitted from the first light source assembly passes through the first beam splitter and the first polarization conversion element when it enters the wavelength conversion device. The residual excitation light enters the light reuse assembly after passing through the beam splitter and beam combiner, then passes through the first polarization conversion element and then enters the first beam splitter. 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 reflected by the first beam splitter and then enters the second reflection element. It is reflected back to the first beam splitter, reflected again by the first beam splitter, and then enters the first polarization conversion element. After passing through the first polarization conversion element and the beam splitter and beam combiner, it can enter the wavelength conversion device again for re-excitation.

[0015] In some embodiments, the elements in the light reuse assembly are disposed on at least two sides of the light splitting and combining element; the excitation light emitted from the first light source assembly is in a first polarization state; the light splitting and combining element transmits the excitation light in the first polarization state and reflects the excitation light in the second polarization state.

[0016] The light reuse assembly includes a first polarization conversion element and a second beam splitter element. Excitation light of the first polarization state emitted from the first light source assembly passes through the first polarization conversion element when it enters the wavelength conversion device. Residual excitation light enters the first polarization conversion element through a shaping lens group. 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 of the second polarization state enters a beam splitter and combiner element, is reflected by the beam splitter and combiner element, and then enters the second beam splitter element. It is reflected back to the beam splitter and combiner element, and after passing through the beam splitter and combiner element and the first polarization conversion element, it can re-enter the wavelength conversion device for re-excitation. The second beam splitter element can transmit light of the first polarization state and reflect light of the second polarization state, or it can reflect light with a dominant wavelength equal to the target wavelength. The dominant wavelength of the excitation light emitted from the first light source assembly is the target wavelength.

[0017] Alternatively, the light reuse assembly includes a first polarization conversion element, a third beam splitter, and a second reflection element. The excitation light of the first polarization state emitted from the first light source assembly passes through the first polarization conversion element when it enters the wavelength conversion device. The residual excitation light enters the first polarization conversion element through a shaping lens group. 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 enters the beam splitter and combiner element, is reflected by the beam splitter and combiner element, enters the third beam splitter element, is reflected by the third beam splitter element, enters the second reflection element, is reflected back to the third beam splitter element, is reflected again by the third beam splitter element, and enters the beam splitter and combiner element. After passing through the beam splitter and combiner element and the first polarization conversion element, it can enter the wavelength conversion device again for re-excitation.

[0018] In some embodiments, if the optical axis of the excitation light emitted from the first light source assembly is offset from the optical axis of the shaping lens group, the light reuse assembly includes a first reflective element.

[0019] The residual excitation light is transmitted to the first reflective element through the light splitter and combiner. The first reflective element reflects the residual blue light back to the light splitter and combiner, and then transmits it to the wavelength conversion device for re-excitation.

[0020] In some embodiments,

[0021] The optical axis of the first reflective element and the optical axis of the excitation light emitted from the first light source assembly are symmetrical with respect to the optical axis of the shaping lens group.

[0022] And / or, the long side of the first reflective element is greater than or equal to the long axis of the residual excitation light spot, and the short side of the first reflective element is greater than or equal to the short axis of the residual excitation light spot.

[0023] In some embodiments, the light reuse assembly includes a target beam-splitting element;

[0024] The target beam splitter transmits the excitation light emitted from the first light source and reflects the target's excited light.

[0025] Alternatively, the target beam splitter transmits the excitation light emitted from the first light source and the residual excitation light, which then reflects the target's excited light.

[0026] In some embodiments,

[0027] If the optical axis of the excitation light emitted by the first light source assembly is offset from the optical axis of the shaping lens group, the light reuse assembly includes a target reflection element, the target reflection element includes a target area, the target area reflects the residual excitation light, and other areas of the target reflection element transmit the excitation light emitted by the first light source assembly and reflect the target excited light.

[0028] The optical axis of the excitation light emitted from the first light source assembly coincides with the optical axis of the shaping lens assembly. The light reuse assembly includes a fourth beam splitting element, which includes a beam splitting region. The beam splitting region is 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, reflects the target excitation light, and reflects the residual excitation light and the target excitation light in other areas. Alternatively, the beam splitting region transmits the excitation light emitted from the first light source assembly, and reflects the residual excitation light and the target excitation light in other areas.

[0029] In some embodiments,

[0030] The light splitter and combiner can transmit blue light of the first polarization state in the first band and reflect blue light of the second polarization state in the first band. The second light source assembly emits blue laser light of the first polarization state, and the first light source assembly emits excitation light of the first polarization state. A second polarization conversion element is also provided between the light splitter and combiner and the wavelength conversion device.

[0031] The excitation light of the first polarization state emitted from the first light source component passes through the second polarization conversion element once when it enters the wavelength conversion device. When the wavelength conversion device is excited by the emitted excitation light, the light emitted from the wavelength conversion device also includes residual excitation light. Before the residual excitation light enters the beam splitter and beam combiner again, it passes through the second polarization conversion element again, and the polarization state of the residual excitation light is converted to the second polarization state. The beam splitter and beam combiner reflects the residual excitation light of the second polarization state into the beam homogenizer, and after being homogenized by the beam homogenizer, it is emitted.

[0032] In some embodiments,

[0033] The light splitter and combiner can transmit blue light in the first band, green light in the first polarization state in the second band, red light in the third band or red light in the first polarization state in the third band, and reflect green light in the second polarization state in the second band and / or red light in the second polarization state in the third band, as well as light in other bands.

[0034] The light of the second polarization state in the second band of the excited light and / or the light of the second polarization state in the third band of the excited light, and the light of the remaining bands are reflected by the light splitting and combining element and then enter the light homogenizing element;

[0035] The light-splitting and light-combining element transmits excitation light and target stimulated light, wherein the target stimulated light includes light of the first polarization state in the second band of the stimulated light and / or light of the first polarization state in the third band of the stimulated light.

[0036] In some embodiments, the primary color light emitted by the second light source assembly includes green laser, red laser and blue laser in a first polarization state, and the light splitting and combining element transmits green laser, red laser and blue laser in the first polarization state;

[0037] And / or, when the excitation light emitted by the first light source component is blue laser, its polarization state is the same as that of the blue laser emitted by the second light source component.

[0038] In some embodiments, the second light source assembly emits red laser light. The second light source assembly includes a first laser source and a second laser source that are independent of each other, as well as a light guide assembly. The first laser source and the second laser source are arranged opposite to each other.

[0039] The first spot of the red laser emitted from the first laser source and the second spot of the red laser emitted from the second laser source are guided by the light guide component 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.

[0040] And / or, the first laser source and the second laser source also emit blue laser and green laser, and the distance between the position of the first laser source and / or the second laser source emitting red laser and the light-emitting side of the light source component is shorter than the distance between the position of the position emitting blue laser and green laser and the light-emitting side of the light source component.

[0041] In some embodiments, the second light source assembly further includes a third laser light source, which emits blue laser light, and the light guide assembly is used to combine the blue laser light emitted by the third laser light source with the blue laser light emitted by the first laser light source and the second laser light source.

[0042] In some embodiments, the first light source assembly and the second light source assembly are arranged side by side on one side of the light splitting and combining element.

[0043] In some embodiments, a first speckle suppression element is provided on the light-emitting side of the first light source assembly, and / or a second speckle suppression element is provided on the light-emitting side of the second light source assembly.

[0044] In some embodiments, the wavelength conversion device includes at least one conversion region, each conversion region 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;

[0045] And / or, the wavelength conversion device further includes a transmission region, and the light source system further includes a reflection guiding component for guiding the excitation light transmitted through the transmission region to the homogenizing element.

[0046] In some embodiments, phosphor is disposed in the conversion region of the wavelength conversion device, and the ratio of phosphor in each conversion region is within a preset ratio range and the thickness is within a preset thickness range.

[0047] In some embodiments, the second light source assembly includes a first compound eye, and the light-diffusing element is the second compound eye;

[0048] The angle of incidence of the light emitted from the second light source component into the first compound eye is greater than the angle of incidence into the second compound eye.

[0049] And / or, the incident angle of the light entering the second compound eye is less than a preset angle threshold.

[0050] In some embodiments, a color filter element and a driving device are provided between the wavelength conversion device and the light splitting and combining element. Under a first preset condition, the driving device drives the color filter element to be located in the optical path of the excited light, thereby filtering the excited light. Under a second preset condition, the driving device drives the color filter element to be located outside the optical path of the excited light.

[0051] Alternatively, a color filter element can be provided between the wavelength conversion device and the light splitting and combining element to filter the excited light.

[0052] In some embodiments, the second light source assembly includes a first laser light source and a second laser light source. When the first laser light source and / or the second laser light source includes a light-emitting chip with 4 red lasers, a light-emitting chip with 3 green lasers, and a light-emitting chip with 2 blue lasers, the power supply current of the first laser light source and / or the second laser light source is between 6A and 8A.

[0053] In some embodiments,

[0054] The first light source assembly includes an excitation light source and / or a target light source, wherein the excitation light emitted from the excitation light source and / or the light emitted from the target light source are used as excitation light to excite the wavelength conversion device.

[0055] In some embodiments, the wavelength conversion device further includes a reflective region, which is any one of a reflective element, a polished metal layer or metal plate, a substrate coated with a reflective film, particles with diffuse reflection, a microstructured reflective layer, or a reflective diffuser.

[0056] The optical axis of the excitation light emitted from the first light source assembly is offset from the optical axis of the shaping lens assembly. The light source system also includes a fifth beam splitter element, which transmits the primary color light emitted from the second light source assembly and reflects the excitation light reflected by the reflection area of ​​the wavelength conversion device. The reflected excitation light is then injected into the homogenizing element.

[0057] In some embodiments, the first light source component and the wavelength conversion device are integrated into a CG LED. The light source system also includes an RLED, a second light splitter and combiner, and a target light splitter, with the light splitter and combiner and the second light splitter and combiner arranged alternately.

[0058] The second light-splitting and light-combining element transmits the primary color light emitted from the second light source assembly and the green LED light emitted from the CG LED, and reflects the red LED light emitted from the RLED;

[0059] The light splitter and combiner transmits the primary color light emitted from the second light source assembly and the red LED light emitted from the R LED, and reflects the green LED light emitted from the CG LED;

[0060] The target beam splitter transmits red LED light and reflects some of the green LED light transmitted from the beam splitter and combiner.

[0061] 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.

[0062] The light source system provided in this application, when combining primary color light and stimulated light, uses a beam splitter and combiner to reflect a portion of the stimulated light that cannot enter the uniform light element as the output light of the light source system to a wavelength conversion device. After processing by the wavelength conversion device, the light is then injected back into the beam splitter and combiner, whereby 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 beam combining efficiency and thus increasing the brightness of the projection device. Furthermore, the combined output light of the stimulated light and the primary color light emitted by the second light source component reduces problems such as speckle, color fringing, ghosting, and color unevenness. Attached Figure Description

[0063] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps. Wherein:

[0064] Figure 1 This is a schematic diagram of the structure of a light source system in one embodiment of this application;

[0065] Figure 2 This is a partial structural schematic diagram of the second light source component in one embodiment of this application;

[0066] Figure 3 is a schematic diagram of the structure of the first light source assembly and the second light source assembly in one embodiment of this application;

[0067] Figure 4 This is a schematic diagram of the light source system in another embodiment of this application;

[0068] Figure 5 This is a schematic diagram of the light source system in another embodiment of this application;

[0069] Figure 6 This is a schematic diagram of the light source system in another embodiment of this application;

[0070] Figure 7 This is a schematic diagram of the light source system in another embodiment of this application;

[0071] Figure 8 This is a schematic diagram of the light source system in another embodiment of this application;

[0072] Figure 9 This is a schematic diagram of the light source system in another embodiment of this application;

[0073] Figure 10 This is a schematic diagram of the light source system in another embodiment of this application;

[0074] Figure 11 This is a schematic diagram of the light source system in another embodiment of this application;

[0075] Figure 12 This is a schematic diagram of the light source system in another embodiment of this application;

[0076] Figure 13 This is a schematic diagram of the light source system in another embodiment of this application;

[0077] Figure 14 This is a schematic diagram of the light source system in another embodiment of this application;

[0078] Figure 15 This is a schematic diagram of the light source system in another embodiment of this application;

[0079] Figure 16 This is a schematic diagram of the projection device in one embodiment of this application. Detailed Implementation

[0080] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application. Furthermore, although the disclosure in this application is introduced according to one or several exemplary examples, it should be understood that each aspect of these disclosures can also constitute a complete technical solution on its own. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0081] In the embodiments of this application, words such as "exemplarily" and "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as an "example" in this application should not be construed as being better or more advantageous than other embodiments or designs. Rather, the use of the word "example" is intended to present the concept in a specific manner.

[0082] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” and similar terms used in this application do not indicate any order, quantity, or importance, but are used solely for distinguishing descriptions. Terms such as “comprising” or “including” mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. The term “and / or” includes any and all combinations of one or more associated listed items.

[0083] To fully understand this application, a detailed description is provided below to illustrate the technical solutions of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0084] This embodiment provides a light source system. Figure 1 This is a schematic diagram of the structure of a light source system provided in this embodiment; as shown. Figure 1 As shown, the light source system includes a first light source assembly 01, a second light source assembly 02, a light splitting and combining element 12, a wavelength conversion device 16, a light reuse assembly, a shaping lens group 15, and a light homogenizing element 23. The first light source assembly 01 can emit excitation light, and the second light source assembly 02 can emit at least one primary color light; wherein:

[0085] The primary color light emitted from the second light source component is injected into the light homogenizing element after passing through the light splitting and combining element, and is then emitted after being homogenized by the light homogenizing element.

[0086] The excitation light emitted from the first light source assembly is incident on the wavelength conversion device via the light splitting and combining element and the shaping lens group, or the excitation light emitted from the first light source assembly is incident on the wavelength conversion device; when the wavelength conversion device is excited by the incident excitation light, the light emitted from the wavelength conversion device includes the excited light, the excited light is incident on the shaping lens group, and is incident on the light splitting and combining element via the shaping lens group.

[0087] The target stimulated light is transmitted through a beam splitter and combiner and then enters a light recycling component. The light recycling component reflects the target stimulated light back to the beam splitter and combiner, and then through the beam splitter and combiner and a shaping lens group into a wavelength conversion device. From the wavelength conversion device, a first stimulated light and a second stimulated light are emitted. 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 and combiner and then enters a homogenizing element for homogenization. The second stimulated light is transmitted through the beam splitter and combiner and then enters the light recycling component. This cycle repeats. The target stimulated light is the light whose wavelength overlaps with the primary color light emitted from the second light source component and whose polarization state is the same.

[0088] The remaining stimulated light in the stimulated light is incident on the beam splitter and combiner via the beam splitter and combiner, and then emitted after being homogenized by the beam homogenizer. Therefore, when the beam splitter and combiner combines the primary color light and the stimulated light, some of the stimulated light that cannot enter the beam homogenizer as the output light of the light source system is reflected by the light recycling component to the wavelength conversion device. After being processed by the wavelength conversion device, it is injected back into the beam splitter and combiner, so that 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.

[0089] Optionally, the stimulated light is broadband light, while the primary color light emitted from the second light source is narrow-spectrum light. The stimulated light and the primary color light emitted from the second light source components are combined before being emitted, which can reduce problems such as speckle, color fringing, and color unevenness.

[0090] Optionally, a reflective element, a shaping lens group, etc., can be disposed between the light splitting and combining element and the light homogenizing element, such as... Figure 1 The light source system comprises a reflecting element 21, a shaping lens group 20, and a shaping lens group 22. The reflecting element refracts the light path, allowing for a smaller system size. The shaping lens group shapes the light entering the homogenizing element into collimated light, resulting in a more uniform light spot. Optionally, a quarter-wave plate can be placed between the beam splitter / combiner and the homogenizing element, such as... Figure 1 The middle element 19 can change the polarization state of the light to be incident on the homogenizing element, and in combination with the subsequent spatial light modulator, improve the brightness uniformity problem.

[0091] Optionally, the light-diffusing element can be a single-sided compound eye, a double-sided compound eye, or a light bar, etc.

[0092] Optionally, the distance between the wavelength conversion device and the light splitting and combining element is less than a preset distance. The preset distance can be customized according to the actual application, which can make the whole system smaller and more compact.

[0093] Optionally, such as Figure 1 As shown, the light reuse assembly may include a target beam splitter 31, which can transmit the excitation light generated by the first light source assembly and reflect the target excited light, thereby reflecting the excited light to the beam splitter and combiner.

[0094] In some embodiments, as shown in FIG3(b), the first light source assembly 01 includes an excitation light source 17, which is not limited to an excitation light source or an excitation light; the excitation light source can be an LED or a laser LD and other novel light sources, or a hybrid light source of LED and laser LD, etc. The number of light-emitting chips in the excitation light source is not limited, and can be a single light-emitting chip or an array of light-emitting chips.

[0095] For example, the excitation source can be a blue laser LD, and the excitation light can be a blue laser with no limitation on its wavelength range, such as a wavelength between 430nm and 480nm; or the dominant wavelength of the blue laser can be 455nm. Another example is a blue LED, where the excitation source is blue LED light, and the wavelength conversion device is a wavelength conversion sheet. This wavelength conversion sheet can be a static phosphor (such as yellow, green, orange, red, or tangerine phosphors), and the blue LED light emitted from the blue LED serves as the excitation light to excite the wavelength conversion sheet.

[0096] Optionally, the first light source component includes a target light source, and the wavelength conversion device is a wavelength conversion plate. The light emitted from the target light source is used as excitation light to excite the wavelength conversion plate. For example, the target light source can also be a blue LED light source. It is understood that the target light source can be integrated with the wavelength conversion plate, such as integrated with a green phosphor to form a CG LED or integrated with a yellow phosphor to form a YLED.

[0097] Optionally, the first light source assembly includes an excitation source and a target source. For example, the excitation source is a blue LED, and both the blue LED light emitted from the blue LED and the light emitted from the target source serve as excitation light to double-sidedly excite the wavelength conversion plate. The target source can be integrated with the wavelength conversion plate, such as a CG LED or a Y LED. Another example is that both the excitation source and the target source are blue laser LDs, and the wavelength conversion device is a transmissive phosphor wheel, such as... Figure 4 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 be set between the target light source 03 and the fluorescent wheel 16.

[0098] In some embodiments, the primary color light emitted by the second light source component 02 is not limited and may include at least one of red light, green light, and blue light; the light source in the second light source component is not limited and may be an LED or a laser LD and other novel light sources, or a hybrid light source of LED and laser LD, etc.

[0099] Optionally, the second light source assembly 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 P-state or S-state.

[0100] For example, the primary color light emitted by the second light source component includes green, red, and blue lasers in the first polarization state, and the light splitter / combiner transmits the green, red, and blue lasers 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 those of the green laser. The wavelength range of the blue laser is not limited; for example, the dominant wavelength of the blue laser is 465 nm.

[0101] Optionally, when the excitation light emitted by the first light source component is blue laser, its polarization state is the same as that of the blue laser emitted by the second light source component, which can be either P-state or S-state, for example, P-state.

[0102] Optionally, as shown in Figure 3(a), when the second light source assembly 02 includes a first laser light source 1 and a second laser light source 2, and the first laser light source and / or the second laser light source includes 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 and / or the second laser light source is between 6A and 8A. The first laser light source and the second laser light source overcome the limitation of power supply current, ensuring sufficient blue light in the light source system and achieving a better light combining ratio.

[0103] Optionally, polarization conversion elements can be set on the light-emitting side of each color laser source to change the polarization state of each color laser to meet the needs of subsequent optical paths. The polarization conversion elements can be half-wave plates, quarter-wave plates, etc. For example, as shown in Figure 3(a), the second light source assembly 02 can be equipped with polarization conversion elements 24, 25, and 26 corresponding to the first laser source 1; and polarization conversion elements 27, 28, and 29 corresponding to the second laser source 2.

[0104] Optionally, the second light source assembly emits red laser light. The second light source assembly includes a first laser source and a second laser source that are independent of each other, as well as a light guide assembly. The first laser source and the second laser source are arranged opposite to each other. The light guide assembly may include, but is not limited to, reflective elements, dichroic elements, etc.; for example, as shown in Figure 3(a), the light guide assembly includes reflective elements 3 and 4, and dichroic elements 5 and 6.

[0105] The first spot of red laser emitted from the first laser source and the second spot of red laser emitted from the second laser source are guided by a light guide component to form a side-by-side light spot. In the side-by-side light 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 light spot can be relatively small, which can reduce the size of subsequent components and thus reduce the volume of the light source system.

[0106] The long sides of both the first and second laser light sources are parallel to the optical axis of the laser beam emitted from the second light source assembly. Both the first and second laser light sources have at least two rows of light-emitting chips arranged in a first direction. Each row of light-emitting chips has multiple chips arranged along a second direction. The long side of the side-by-side laser beam spot is related to the length of each row of light-emitting chips in the second direction. The first direction corresponds to the long sides of the first and second laser light sources, and the second direction corresponds to the short sides of the first and second laser light sources. Figure 2 The diagram shown is a partial structural schematic of a second light source component provided in this embodiment, illustrating the arrangement of the first laser source and the second laser source. In this embodiment, the distance between the laser beam emitted from the first laser source and the laser beam emitted from the second laser source 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.

[0107] Optionally, the first and second laser sources also emit blue and green lasers. The distance between the position where the red laser is emitted from the first and / or second laser sources and the light-emitting side of the light source assembly is shorter than the distance between the positions where the blue and green lasers are emitted and the light-emitting side of the light source assembly. The larger divergence angle of the red laser and its proximity to the light-emitting side can reduce the size of the light source system.

[0108] Optionally, the first light source assembly and the second light source assembly are arranged side-by-side on one side of the beam splitter and combiner. This allows for better heat dissipation, stabilizes the light emitted by the light source system, and improves image quality. It also allows for a higher supply voltage to the light-emitting chip, thereby increasing the brightness of the projection device. Optionally, to enable the excitation light emitted by the first light source assembly and the laser emitted by the second light source assembly to enter the beam splitter and combiner, reflective elements 9 and shaping lens groups 10 can be provided on their respective light-emitting sides. It should be noted that the shaping lens group mentioned in this application may include one or more lenses, which can be spherical or aspherical lenses, and their curvature parameters can be customized according to the actual application.

[0109] Optionally, as shown in Figure 3, a first speckle suppression element 18 is provided on the light-emitting side of the first light source assembly 01, and / or a second speckle suppression element 11 is provided on the light-emitting side of the second light source assembly 02. The first and second speckle suppression elements can be diffusers, diffuser wheels, compound eyes, dynamic light retarder (LSR), etc.; the first and second speckle suppression elements can homogenize the excitation light and the laser light, thereby making the light spot distribution entering the homogenizing element more uniform, thus improving the speckle problem. Optionally, the laser light emitted from the first laser source and the second laser source can be combined by the light guide assembly and then injected into the dynamic light retarder 7 to suppress speckle.

[0110] Optionally, as shown in Figure 3(a), the second light source assembly 02 further includes a third laser light source 34, which emits blue laser light. The light guide assembly is used to combine the blue laser light emitted by the third laser light source with the blue laser light emitted by the first and second laser light sources. 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; alternatively, the third laser light source is located between the first and second laser light sources, passing through the middle of elements 3 and 4, and combining with the blue laser light emitted by the first and second laser light sources. Optionally, a polarization conversion element 35 can also be provided on the light-emitting side of the third laser light source to convert the polarization state of the blue laser light to meet the requirements of subsequent optical paths. By adding a blue laser light source, the heat dissipation pressure of the first and second laser light sources can be reduced, while the brightness of the projection device can be improved.

[0111] Optionally, the second light source assembly 02 includes a first compound eye 8 and a light-diffusing element is a second compound eye; the incident angle of the light emitted from the second light source assembly into the first compound eye is greater than the incident angle into the second compound eye; the first compound eye can be a hexagonal glass compound eye, and the second compound eye can be a double-sided compound eye; this allows for better light uniformity.

[0112] Optionally, the incident angle of the light entering 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 entering the second compound eye at a smaller angle is more uniform, thus suppressing speckle problems and resulting in a more uniform image quality from the projection device. It should be noted that if the light-diffusing element is a light bar, the above limitation on the incident angle of the light may not be required.

[0113] In some embodiments, the wavelength conversion device includes at least one conversion region, which includes an anti-reflection layer, a wavelength conversion layer, and a reflective layer; excitation light passes through the anti-reflection layer and then enters the wavelength conversion layer, where the wavelength conversion layer is excited by the excitation light to generate excited light, which is then reflected by the reflective layer and emitted.

[0114] Optionally, the reflective layer can be a reflective film deposited on a heat dissipation substrate, such as printing a diffuse reflective white layer on the heat dissipation substrate. The white layer reflects blue light and fluorescence, and 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. 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 incident excitation light to return to the wavelength conversion layer for excitation, thereby improving the excitation efficiency.

[0115] Optionally, the wavelength conversion layer contains a wavelength conversion material, which can be a phosphor or a phosphite. For example, it can be a yellow phosphor that emits yellow light upon excitation, such as a yttrium aluminum garnet (YAG) phosphor containing cerium (Ce) as an activator, or it can be a green phosphor, red phosphor, yellow phosphor, orange phosphor, tangerine phosphor, cyan phosphor, etc. Optionally, the conversion region can include a first region and a second region, each region corresponding to a wavelength conversion material, capable of producing at least one color of light with a wavelength different from the excitation light; that is, the excitation light can be at least one of yellow, red, green, orange, tangerine, and cyan fluorescence. For example, the wavelength conversion layer of the first region (G region) is composed of a mixture of green or cyan phosphor and an organic adhesive, which is excited to produce green or cyan fluorescence; the green phosphor is an aluminate, silicate, or β-thionyl green phosphor, and the organic adhesive is high-temperature silicone or epoxy adhesive. The wavelength conversion layer of the second region (R region) is made of yellow, orange, or red phosphor mixed with organic adhesive, which is excited to produce yellow, red, orange, or yellow fluorescence; the red phosphor is nitride, silicate, or α-thionyl 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.

[0116] Optionally, the antireflection layer is a glass, sapphire, or silicon carbide coated antireflection film, or a nano-SiO2 film, or a beam splitter. Optionally, the antireflection 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 to 1mm, preferably 0.4mm; if blue laser light directly irradiates the sapphire, the sapphire has good temperature resistance, and the excitation light is incident on the wavelength conversion layer after passing through the sapphire, which can improve the radiation power density of the wavelength conversion layer. The antireflection layer reduces the transmission of blue light, and the refractive index difference between the antireflection 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 the antireflection layer and the wavelength conversion layer are both 1.5-1.7. The proportion of excited light in the light incident from the fluorescent 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 enters the wavelength conversion layer, the amount of reflected blue light can be reduced, thereby reducing the proportion of blue light in the light emitted by the wavelength conversion device, i.e., reducing residual blue light, which can improve the color gamut of the projection device.

[0117] Optionally, each conversion region of the wavelength conversion device 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, such as a film deposited on an antireflection layer. Assuming the device includes a first region and a second region, where the first region generates green fluorescence and the second region emits 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 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%.

[0118] For example, in the first region, light transmission in the 400nm-561nm wavelength band has 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%; light reflection in the 615nm-700nm wavelength band has a transmittance T less than 2%. In the second region, light transmission in the 400nm-465nm wavelength band has 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 reflection in the 489nm-592nm wavelength band has a transmittance T less than 2%; and light transmission in the 616nm-693nm wavelength band has a transmittance T greater than 98%. That is, the first antireflection layer can transmit blue and green light (short wavelength) and reflect red light (long wavelength), while the second antireflection layer can transmit blue light and red light and reflect green light. The antireflection layer and the filter layer coated on it can transmit blue light and desired fluorescence while reflecting unwanted fluorescence, thus improving the color gamut.

[0119] Optionally, the stimulated light from the target can undergo diffuse reflection when it enters the wavelength conversion device, thereby changing 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 enters the phosphor surface, thus changing the polarization state of a portion of the stimulated light.

[0120] In some embodiments, the light-splitting and combining element 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, after being reflected by the light-splitting and combining element, enter the homogenizing element; the light-splitting and combining element 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 light of the first polarization state of the third wavelength band in the excited light. The light-splitting and combining element 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 using this beam splitter and combiner, the beam combining efficiency can be improved, thereby increasing the brightness of the projection device.

[0121] For example, the excitation light is a blue laser, and the second light source component emits blue, red, and green lasers. The excited light includes yellow fluorescence, and the first polarization state is P-state. The film coated on the light-splitting and combining element can transmit blue light in the 430-490nm band, P-state green light in the 510-540nm band, and red light or P-state red light in the 625-680nm band, while other bands and polarization states of light are reflected. Assuming the conversion... The region includes yellow phosphor, and the excited light is yellow fluorescence with a wavelength range of 500-680nm. Then, the P-state light in the yellow fluorescence with a wavelength range of 510-540nm and the light in the wavelength range of 625-680nm or the P-state red light in the wavelength range of 625-680nm are transmitted through the light splitter and combiner. The S-state light in the wavelength range of 510-540nm and / or the S-state red light in the wavelength range of 625-680nm are reflected by the light splitter and combiner. Light in other wavelength ranges is also reflected. In essence, all S-state fluorescence and 35% of P-state fluorescence in the excited light (fluorescence) are reflected into the homogenizing element as the output light of the light source system. Approximately 15% of the P-state fluorescence is transmitted through the beam splitter and combiner. Therefore, the light reuse component allows this 15% P-state fluorescence to re-enter the wavelength conversion device. Due to diffuse reflection, after reflection, approximately 7.5% of the P-state fluorescence becomes S-state and 7.5% becomes P-state. The 7.5% S-state is reflected back into the homogenizing element by the beam splitter and combiner, while the 7.5% P-state follows the same optical path as the original P-state fluorescence and re-enters the wavelength conversion device, repeating this cycle. It should be noted that because the cycle converts all P-state fluorescence to S-state, 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 side are not necessary, reducing the number of devices while maintaining high brightness.

[0122] Optionally, the excitation light is a blue laser, and the second light source assembly emits blue and red lasers. The excited light includes red / green / 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 optical splitter / combiner allows the transmission of S-state and / or P-state blue and red lasers, the transmission of P-state or S-state light in some wavelength ranges of the red / green / yellow fluorescence, and the reflection of light in other wavelength ranges and polarization states. For example, the film coated on the optical splitter / combiner 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, while the light in other wavelength ranges is reflected. 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 a light splitter and combiner, the S-state light in the 610-620nm wavelength range is reflected by the light splitter and combiner, 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.

[0123] In some embodiments, such as Figure 5 The wavelength conversion device 16 and the light splitting and combining element 12 are provided with a color filter element 30 and a driving device. 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 the 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 the 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. Optionally, a color filter element is provided between the wavelength conversion device and the light splitting and combining element, and the color filter element filters the stimulated light; that is, the color filter element 30 may also be static, always located in the optical path to filter the stimulated light, thereby improving the color gamut of the light source system.

[0124] In some embodiments, when the wavelength conversion device is excited by the incident excitation light, the light emitted from the wavelength conversion device also includes residual excitation light. This residual excitation light is directed towards a shaping lens group, shaped by the lens group, and then incident on a beam splitter / combiner and a light reuse assembly. The light reuse assembly and the beam splitter / combiner enable the residual excitation light to be re-injected into the wavelength conversion device for re-excitation, thereby improving the excitation efficiency. The light reuse assembly may include, but is not limited to, the following implementations:

[0125] Optionally, if the optical axis of the excitation light emitted from the first light source assembly coincides with the optical axis of the shaping lens assembly, then the polarization state of the excitation light emitted from the first light source assembly is the first polarization state; the light reuse assembly is disposed between the first light source assembly and the light splitting and combining element. It should be noted that the coincidence can be complete or within a certain error range.

[0126] Method 1, such as Figure 5 As shown, the light reuse assembly includes a first polarization conversion element 32 and a polarization separation element 33. The excitation light of the first polarization state emitted from the first light source assembly passes through the polarization separation element and the first polarization conversion element when it enters the wavelength conversion device. The residual excitation light, after passing through a beam splitter and combiner element and entering the light reuse assembly, first passes through the first polarization conversion element and then enters the polarization separation element. 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 of the second polarization state is reflected by the polarization separation element and then enters the first polarization conversion element. After passing through the first polarization conversion element and the beam splitter and combiner element, it can re-enter the wavelength conversion device for re-excitation. For example, the first polarization conversion element can be a quarter-wave plate, and the polarization separation element can be a wire grating, a PBS, or a 0-degree polarizer that transmits P-state and reflects S-state blue light.

[0127] Method 2, such as Figure 6 As shown, the light reuse assembly includes a first polarization conversion element 32, a first beam splitter 331, and a second reflective element 332. The excitation light of the first polarization state emitted from the first light source assembly passes through the first beam splitter and the first polarization conversion element when it enters the wavelength conversion device. The residual excitation light, after passing through a beam splitter and combiner and entering the light reuse assembly, first passes through the first polarization conversion element and then back into the first 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 of the second polarization state is reflected by the first beam splitter and then enters the second reflective element. It is reflected back to the first beam splitter, reflected again by the first beam splitter, and then enters the first polarization conversion element. After passing through the first polarization conversion element and the beam splitter and combiner, it can re-enter the wavelength conversion device for re-excitation. For example, the second reflective element can be a mirror, a substrate coated with a reflective film, a reflective diffuser, etc. The first beam splitter can transmit P-state blue light and reflect S-state blue light.

[0128] Optionally, if the optical axis of the excitation light emitted from the first light source assembly coincides with the optical axis of the shaping lens group; the elements in the light reuse assembly are disposed on at least two sides of the light splitting and combining element; the polarization state of the excitation light emitted from the first light source assembly is a first polarization state; the light splitting and combining element transmits the excitation light of the first polarization state and reflects the excitation light of the second polarization state;

[0129] Method 3: The light reuse assembly includes a first polarization conversion element 32 and a second beam splitter 40. The excitation light of the first polarization state emitted from the first light source assembly passes through the first polarization conversion element when it enters the wavelength conversion device. The residual excitation light enters the first polarization conversion element through a shaping lens group. 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 of the second polarization state enters a beam splitter and combiner, is reflected by the beam splitter and combiner, and then enters the second beam splitter. It is reflected back to the beam splitter and combiner, and after passing through the beam splitter and combiner and the first polarization conversion element, it can re-enter the wavelength conversion device for re-excitation. The second beam splitter can transmit light of the first polarization state and reflect light of the second polarization state, or it can reflect light with a dominant wavelength equal to the target wavelength. The dominant wavelength of the excitation light emitted from the first light source assembly is the target wavelength, which is not limited; for example, it can be 455 nm. Figure 7 As shown, the first polarization conversion element 32 and the second beam splitting element 40 are distributed on both sides of the beam splitting and combining element 12. The beam splitting and combining element and the second beam splitting element 40 can transmit P-state blue light and reflect S-state blue light, and can also transmit red laser, green laser and stimulated light; or the beam splitting and combining element can transmit P-state blue light and reflect S-state blue light, and the second beam splitting element 40 can transmit 465nm blue laser and reflect 455nm blue laser.

[0130] Method four: The light reuse assembly includes a first polarization conversion element, a third beam splitter, and a second reflector. The excitation light of the first polarization state emitted from the first light source assembly passes through the first polarization conversion element when it enters the wavelength conversion device. The residual excitation light enters the first polarization conversion element through a shaping lens group. 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 of the second polarization state enters a beam splitter / combiner element, is reflected by the beam splitter / combiner element, enters the third beam splitter element, is reflected by the third beam splitter element, enters the second reflector element, is reflected back to the third beam splitter element, is reflected again by the third beam splitter element, and enters the beam splitter / combiner element. After passing through the beam splitter / combiner element and the first polarization conversion element, it can re-enter the wavelength conversion device for re-excitation. For example, as... Figure 8 As shown, the first polarization conversion element 32, the third beam splitting element 41, and the second reflection element 42 are distributed on both sides of the beam splitting and combining element 12; the beam splitting and combining element and the third beam splitting element 41 can transmit P-state blue light and reflect S-state blue light.

[0131] Optionally, if the optical axis of the excitation light emitted from the first light source assembly is offset from the optical axis of the shaping lens group, the light reuse assembly includes a first reflective element.

[0132] Method 5: The residual excitation light is incident on the first reflecting element via a beam splitter / combiner. The first reflecting element reflects the residual blue light back to the beam splitter / combiner, and then it is incident again on the wavelength conversion device for re-excitation. For example... Figure 9 As shown, the first reflecting element 37 can be a small reflector.

[0133] Optionally, the optical axis of the first reflective element and the optical axis of the excitation light emitted from the first light source assembly are symmetrical with respect to the optical axis of the shaping lens group; this can enable the first reflective element to reflect as much of the residual excitation light as possible back to the light-splitting and combining element, 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%.

[0134] Optionally, the long side of the first reflective element is greater than or equal to the major axis of the residual excitation light spot, and the short side of the first reflective element is greater than or equal to the minor axis of the residual excitation light spot. By controlling the size of the first reflective element, the volume of the light source system can be reduced while reflecting the residual excitation light as much as possible.

[0135] In the schemes shown in methods one to four, the light reuse component includes a target beam splitter 31. In schemes one and two, the target beam splitter 31 transmits the excitation light emitted from the first light source and the residual excitation light and reflects the target excited light. Alternatively, in schemes three, four, and five, the target beam splitter 31 transmits the excitation light emitted from the first light source and reflects the target excited light. The light reuse component can simultaneously recover fluorescence and re-excite blue light, improving the light combining efficiency and excitation efficiency, thereby improving the luminous efficiency of the light source system.

[0136] Method Six: If the optical axis of the excitation light emitted from the first light source assembly is offset from the optical axis of the shaping lens group, the light reuse assembly includes a target reflecting element. The target reflecting element includes a target area, which reflects the residual excitation light. Other areas of the target reflecting element transmit the excitation light emitted from the first light source assembly, reflecting the target excited light and the residual excitation light. The target area can be a total internal reflection area, such as a reflector. The excitation light emitted from the first light source assembly is transmitted through other areas of the target reflecting element. After the residual excitation light and the target excited light are incident on the third beam splitter via the beam splitter and combiner, the target excited light is reflected back to the beam splitter and combiner via the target reflecting element, and the residual excitation light is reflected back to the beam splitter and combiner via the target area of ​​the target reflecting element. For example, such as... Figure 10 As shown, the upper part of the target reflective element 38 transmits the excitation light emitted from the first light source assembly and reflects the target's excited light, while the lower part (target area) reflects the residual excitation light. This method uses fewer components while ensuring high excitation and light combining efficiency.

[0137] Method 7: The optical axis of the excitation light emitted from the first light source assembly coincides with the optical axis of the shaping lens assembly. The light reuse assembly includes a third beam-splitting element, which includes a beam-splitting region. Optionally, the beam-splitting region can be a through-hole, a substrate coated with an anti-reflection film, or a dichroic lens. If the beam-splitting region is a dichroic lens, it transmits the excitation light emitted from the first light source assembly and reflects the target-excited light, while other regions reflect residual excitation light and the target-excited light. Alternatively, if the beam-splitting region is a through-hole or a substrate coated with an anti-reflection film, it transmits the excitation light emitted from the first light source assembly, while other regions reflect residual excitation light and the target-excited light.

[0138] The excitation light emitted from the first light source assembly is transmitted through the beam-splitting region; the residual excitation light and the target excitation light are incident on the third beam-splitting element through the beam-splitting and combining element. The target excitation light is reflected back to the beam-splitting and combining element by the third beam-splitting element, and the residual excitation light is reflected back to the beam-splitting and combining element by other regions of the third beam-splitting element. For example... Figure 11 As shown, the light reuse component includes a third beam splitter 39. The middle region (splitting region) of the third beam splitter transmits the excitation light emitted from the first light source component and the residual blue light, while other regions (which may be total internal reflection regions) reflect the residual excitation light and the target excited light. This method uses fewer components while ensuring high excitation efficiency and light combining efficiency.

[0139] Optionally, the conversion zone of the wavelength conversion device 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 0.1 mm to 0.25 mm, preferably 0.15 mm to 0.2 mm; the ratio of phosphor to organic adhesive is 2.5:1 to 3.5:1. The proportion of residual excitation light can be changed by adjusting the phosphor concentration and thickness.

[0140] In some embodiments, the light splitter and combiner can transmit blue light of the first polarization state in the first band and reflect blue light of the second polarization state in the first band, the second light source assembly emits blue laser light of the first polarization state, the first light source assembly emits excitation light of the first polarization state, and a second polarization conversion element is also provided between the light splitter and combiner and the wavelength conversion device.

[0141] The excitation light of the first polarization state emitted from the first light source assembly passes through a second polarization conversion element once when it enters the wavelength conversion device. When the wavelength conversion device is excited by the emitted excitation light, the light emitted from the wavelength conversion device also includes residual excitation light. Before the residual excitation light enters the beam splitter and combiner again, it passes through the second polarization conversion element again, thus converting the polarization state of the residual excitation light to the second polarization state. The beam splitter and combiner reflects the residual excitation light of the second polarization state into the homogenizing element, where it is homogenized before being emitted. For example, as... Figure 12As shown, the second polarization conversion element 13 can convert the excitation light emitted from the first light source assembly in the first polarization state into the second polarization state, and the beam splitting and combining element can reflect the residual excitation light to the beam homogenizing element as the output light of the system. By making full use of the excitation light, the brightness of the projection device can be improved.

[0142] In some embodiments, the wavelength conversion device further includes a transmission region, and the light source system further includes a reflection guiding component. The reflection guiding component is used to guide the excitation light transmitted through the transmission region to the homogenizing element, which then serves as the excitation light emitted by the light source system. That is, after passing through the wavelength conversion device, the excitation light, as emitted light, has a different optical path from the residual excitation light. This allows for both full utilization of the residual excitation light for re-excitation and the use of the excitation light as emitted light, thereby improving the brightness of the projection device. For example, as... Figure 13 As shown, the reflection guiding component may include reflective elements 43 and 44. Element 21 may transmit the excitation light generated by the first light source component and reflect the primary color light and stimulated light generated by the second light source component, such as transmitting a blue laser with a main wavelength of 455nm and reflecting blue laser, red laser, green laser and yellow fluorescence with a main wavelength of 466nm.

[0143] In some embodiments, the wavelength conversion device further includes a reflective region, which is any one of a reflective element, a polished metal layer or metal plate, a substrate coated with a reflective film, particles with diffuse reflection, a microstructured reflective layer, or a reflective diffuser. The reflective region can reflect the excitation light incident into the wavelength conversion device back to the light splitter and combiner, thereby passing through the light splitter and combiner and entering the light homogenizer as the output light of the light source system.

[0144] Optionally, the optical axis of the excitation light emitted from the first light source assembly is offset from the optical axis of the shaping lens group. The light source system also includes a fifth beam splitter, which transmits the primary color light emitted from the second light source assembly and reflects the excitation light reflected from the reflection zone of the wavelength conversion device. The reflected excitation light is then incident on the homogenizing element. Figure 14 As shown, the light source system includes a fifth beam splitter 45. Assuming that the wavelength conversion device includes a conversion region and a reflection region, the fifth beam splitter can transmit red laser, green laser and blue laser generated by the second light source assembly. When the blue laser emitted from the first light source enters the conversion region, it satisfies the above-mentioned embodiment. When the blue laser enters the reflection region, the blue laser reflected by the reflection region enters the fifth beam splitter 45 and is reflected. After reflection, it enters the homogenizing element. The target beam splitter 31 can still transmit the blue laser emitted from the first light source assembly and reflect the stimulated light.

[0145] Optionally, when the wavelength conversion device has a reflection area or a transmission area and / or multiple conversion areas, the light source system also includes a driving device corresponding to the wavelength conversion device to drive the wavelength conversion device to move so that the excitation light is sequentially incident into each conversion area or reflection area and each conversion area or transmission area and each conversion area; in this case, the corresponding spatial light modulator can be a DLP, a monolithic LCOS, or a monolithic LCD, etc. When the wavelength conversion device has only one conversion area, the corresponding spatial light modulator can be a three-panel LCOS or a three-panel LCD.

[0146] In some embodiments, the first light source component and the wavelength conversion device are integrated into a CG LED. The light source system also includes an RLED and a second light-splitting and combining element. The light-splitting and combining element is arranged crosswise with the second light-splitting and combining element. The second light-splitting and combining element transmits the primary color light emitted from the second light source component and the green LED light emitted from the CG LED, and reflects the red LED light emitted from the R LED. The light-splitting and combining element transmits the primary color light emitted from the second light source component (such as red laser, green laser, and blue laser) and the red LED light emitted from the R LED, and reflects the green LED light emitted from the CG LED. The target light-splitting element transmits red LED light and reflects a portion of the green LED light transmitted from the light-splitting and combining element. Figure 15 As shown, the wavelength conversion device 16 is a CG LED, and the light source system includes an RLED. The combination of LED light and laser light can reduce problems such as speckle, color fringing, ghosting, and color unevenness.

[0147] In summary, the light source system provided in this application, when the beam splitter and combiner combines the primary color light and the excited light, reflects a portion of the excited light that cannot enter the homogenizing element as the output light of the light source system to the wavelength conversion device through the light reuse component. After processing by the wavelength conversion device, the light is then injected back into the beam splitter and combiner, 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 reduces speckle, color fringing, ghosting, and color unevenness. Moreover, when the wavelength conversion device is excited, a portion of the excitation light remains. The light reuse component can then inject this remaining excitation light back into the wavelength conversion device for re-excitation, which can improve the fluorescence excitation efficiency and thus improve the light efficiency of the projection device.

[0148] Figure 16 This is a schematic diagram of the functional modules of a projection device provided in this application. Figure 16 As shown, the projection device includes an image processor 101 and a projection optical engine 102. Wherein:

[0149] 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.

[0150] The projection optical engine 102 may include a driver chip, a spatial light modulator, 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 driver 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.

[0151] 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.

[0152] 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 16 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:

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items. The character “ / ” in this document generally indicates that the preceding and following objects are in an “or” relationship.

[0158] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A light source system, characterized in that, The light source system includes a first light source component, a second light source component, a light splitting and combining element, a wavelength conversion device, a light reuse component, a shaping lens group, and a light homogenizing element. The first light source component can emit excitation light, and the second light source component can emit at least one primary color light; wherein: The primary color light emitted from the second light source component is incident on the light-splitting and light-combining element and then enters the light-uniforming element. After being uniformly lightened by the light-uniforming element, it is emitted. The excitation light emitted from the first light source component is incident on the wavelength conversion device via the light splitting and combining element and the shaping lens group, or the excitation light emitted from the first light source component is incident on the wavelength conversion device; when the wavelength conversion device is excited by the incident excitation light, the light emitted from the wavelength conversion device includes excited light, which is incident on the shaping lens group and incident on the light splitting and combining element via the shaping lens group; The target stimulated light is transmitted through the beam splitter and combiner and then enters the light reuse assembly. The light reuse assembly reflects the target stimulated light back to the beam splitter and combiner, and then through the beam splitter and combiner and the shaping lens group into 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. The first stimulated light passes through the shaping lens group and the beam splitter and combiner and enters the homogenizing element for homogenization. The second stimulated light is transmitted through the beam splitter and combiner and then enters the light reuse assembly, and this cycle repeats. The target stimulated light is the light whose wavelength overlaps with and has the same polarization state as the primary color light emitted from the second light source assembly. The remaining stimulated light in the stimulated light is incident on the light-splitting and light-combining element and then emitted after being homogenized by the light-splitting element.

2. The light source system according to claim 1, characterized in that, When the wavelength conversion device is excited by the incident excitation light, the light emitted from the wavelength conversion device also includes residual excitation light. The residual excitation light is directed toward the shaping lens group, and after being shaped by the shaping lens group, it is directed toward the beam splitter and beam combiner and the light reuse component. The light reuse component and the beam splitter and beam combiner enable the residual excitation light to be directed back into the wavelength conversion device for re-excitation.

3. The light source system according to claim 2, characterized in that, If the optical axis of the excitation light emitted by the first light source assembly coincides with the optical axis of the shaping lens group, then the polarization state of the excitation light emitted by the first light source assembly is the first polarization state; 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 excitation light of the first polarization state emitted from the first light source assembly passes through the polarization separation element and the first polarization conversion element when it enters the wavelength conversion device. The residual excitation light enters the light reuse assembly through the beam splitting and combining element, then passes through the first polarization conversion element and then enters the polarization separation element. 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 reflected by the polarization separation element and then enters the first polarization conversion element. After passing through the first polarization conversion element and the beam splitting and combining element, it can re-enter the wavelength conversion device for re-excitation. Alternatively, the light reuse assembly includes a first polarization conversion element, a first beam splitter, and a second reflector. The excitation light of the first polarization state emitted from the first light source assembly passes through the first beam splitter and the first polarization conversion element when it enters the wavelength conversion device. The residual excitation light, after entering the light reuse assembly through the beam splitter and combiner, first passes through the first polarization conversion element and then enters the first 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 of the second polarization state is reflected by the first beam splitter and then enters the second reflector. It is reflected back to the first beam splitter, reflected again by the first beam splitter, and then enters the first polarization conversion element. After passing through the first polarization conversion element and the beam splitter and combiner, it can re-enter the wavelength conversion device for re-excitation.

4. The light source system according to claim 2, characterized in that, The components in the light reuse assembly are disposed on at least two sides of the light splitting and combining element; the excitation light emitted from the first light source assembly is in a first polarization state; the light splitting and combining element 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 and a second beam splitter element; the excitation light of the first polarization state emitted from the first light source assembly passes through the first polarization conversion element when it enters the wavelength conversion device; The residual excitation light is incident on the first polarization conversion element through the shaping lens group. 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 incident on the beam splitter and combiner element. After being reflected by the beam splitter and combiner element, it is incident on the second beam splitter element. After being reflected back by the second beam splitter element, it can be incident on the wavelength conversion device again for re-excitation after passing through the beam splitter and combiner element and the first polarization conversion element. The second beam splitter element can transmit light in the first polarization state and reflect light in the second polarization state, or the second beam splitter element can reflect light whose main wavelength is the target wavelength. The main wavelength of the excitation light emitted from the first light source assembly is the target wavelength. Alternatively, the light reuse assembly includes a first polarization conversion element, a third beam splitting element, and a second reflection element, wherein the excitation light of the first polarization state emitted from the first light source assembly passes through the first polarization conversion element when it enters the wavelength conversion device; The residual excitation light is incident on the first polarization conversion element through the shaping lens group. 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 incident on the beam splitter and combiner element. After being reflected by the beam splitter and combiner element, it is incident on the third beam splitter element. After being reflected by the third beam splitter element, it is incident on the second reflector element. After being reflected back to the third beam splitter element by the second reflector element, it is incident on the beam splitter and combiner element again. After passing through the beam splitter and combiner element and the first polarization conversion element, it can be incident on the wavelength conversion device again for re-excitation.

5. The light source system according to claim 2, characterized in that, If the optical axis of the excitation light emitted by the first light source assembly is offset from the optical axis of the shaping lens group, then the light reuse assembly includes a first reflective element. The residual excitation light is incident on the first reflective element via the beam splitter and combiner, and the first reflective element reflects the residual blue light back to the beam splitter and combiner, and then incident on the wavelength conversion device again for re-excitation.

6. The light source system according to claim 5, characterized in that, The optical axis of the first reflective element and the optical axis of the excitation light emitted from the first light source assembly are symmetrical with respect to the optical axis of the shaping lens group; And / or, the long side of the first reflective element is greater than or equal to the long axis of the residual excitation light spot, and the short side of the first reflective element is greater than or equal to the short axis of the residual excitation light spot.

7. The light source system according to claim 1 or 2, characterized in that, The light reuse assembly includes a target beam-splitting element; The target beam splitter transmits the excitation light emitted from the first light source and reflects the target excited light; Alternatively, the target beam splitter transmits the excitation light emitted from the first light source and the residual excitation light, reflecting the target excited light.

8. The light source system according to claim 2, characterized in that, If the optical axis of the excitation light emitted by the first light source assembly is offset from the optical axis of the shaping lens group, the light reuse assembly includes a target reflective element, the target reflective element includes a target area, the target area reflects the residual excitation light, and other areas of the target reflective element transmit the excitation light emitted by the first light source assembly and reflect the target excited light. The optical axis of the excitation light emitted from the first light source assembly coincides with the optical axis of the shaping lens group. The light reuse assembly includes a fourth beam splitting element, which includes a beam splitting region. The beam splitting region is 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 reflects the target excited light. 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 assembly and other regions reflect the residual excitation light and the target excited light.

9. The light source system according to claim 1, characterized in that, The light splitter and combiner can transmit blue light of the first polarization state in the first band and reflect blue light of the second polarization state in the first band. The second light source component emits blue laser light of the first polarization state, and the first light source component emits excitation light of the first polarization state. A second polarization conversion element is also provided between the light splitter and combiner and the wavelength conversion device. The excitation light of the first polarization state emitted by the first light source component passes through the second polarization conversion element once when it enters the wavelength conversion device. When the wavelength conversion device is excited by the emitted excitation light, the light emitted from the wavelength conversion device also includes residual excitation light. Before the residual excitation light enters the beam splitter and combiner again, it passes through the second polarization conversion element again, and the polarization state of the residual excitation light is converted to the second polarization state. The beam splitter and combiner reflects the residual excitation light of the second polarization state into the beam homogenizer, and after being homogenized by the beam homogenizer, it is emitted.

10. The light source system according to claim 1, characterized in that, The light splitter and combiner can transmit blue light in the first band, green light in the first polarization state in the second band, red light in the third band or red light in the first polarization state in the third band, and reflect green light in the second polarization state in the second band and / or red light in the second polarization state in the third band, and light in other bands. The light of the second polarization state in the second band of the stimulated light and / or the light of the second polarization state in the third band of the stimulated light, and the light of the remaining bands are reflected by the light splitting and combining element and then enter the light homogenizing element. The light splitter and combiner transmits excitation light and target stimulated light, wherein the target stimulated light includes light of the first polarization state in the second band of the stimulated light and / or light of the first polarization state in the third band of the stimulated light.

11. The light source system according to claim 1, characterized in that, The primary color light emitted by the second light source component includes green laser, red laser and blue laser in the first polarization state, and the light splitting and combining element transmits the green laser, the red laser and the blue laser in the first polarization state; And / or, when the excitation light emitted by the first light source component is blue laser, its polarization state is the same as that of the blue laser emitted by the second light source component.

12. The light source system according to claim 1, characterized in that, The second light source assembly emits red laser light. The second light source assembly includes a first laser source and a second laser source that are independent of each other, as well as a light guide assembly. The first laser source and the second laser source are arranged opposite to each other. The first spot of the red laser emitted from the first laser source and the second spot of the red laser emitted from the second laser source are guided by the light guide component 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. And / or, the first laser source and the second laser source also emit blue laser and green laser, and the distance from the position where the first laser source and / or the second laser source emits red laser to the light-emitting side of the light source assembly is shorter than the distance from the position where the blue laser and green laser are emitted to the light-emitting side of the light source assembly.

13. The light source system according to claim 12, characterized in that, The second light source assembly also includes a third laser light source, which emits blue laser light. The light guide assembly is used to combine the blue laser light emitted by the third laser light source with the blue laser light emitted by the first laser light source and the second laser light source.

14. The light source system according to claim 1, characterized in that, The first light source assembly and the second light source assembly are arranged side by side on one side of the light splitting and combining element.

15. The light source system according to claim 1, characterized in that, A first speckle suppression element is provided on the light-emitting side of the first light source assembly, and / or a second speckle suppression element is provided on the light-emitting side of the second light source assembly.

16. The light source system according to claim 1, characterized in that, The wavelength conversion device 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 further includes a transmission region, and the light source system further includes a reflection guiding component for guiding the excitation light transmitted through the transmission region to the homogenizing element.

17. The light source system according to claim 16, characterized in that, The wavelength conversion device contains phosphor in the conversion zone, and the phosphor ratio and thickness in each conversion zone are within a preset range.

18. The light source system according to claim 1, characterized in that, The second light source assembly includes a first compound eye, and the light-diffusing element is a second compound eye; The incident angle of the light emitted from the second light source component into the first compound eye is greater than the incident angle into the second compound eye; And / or, the incident angle of the light entering the second compound eye is less than a preset angle threshold.

19. The light source system according to claim 1, characterized in that, A color filter element and a driving device are provided between the wavelength conversion device and the light splitting and combining element. Under a first preset condition, the driving device drives the color filter element to be located in the optical path of the stimulated light, thereby 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. Alternatively, a color filter element may be provided between the wavelength conversion device and the light splitting and combining element, and the color filter element filters the excited light.

20. The light source system according to claim 1, characterized in that, The second light source assembly includes a first laser light source and a second laser light source. When the first laser light source and / or the second laser light source includes 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 and / or the second laser light source is between 6A and 8A.

21. The light source system according to claim 1, characterized in that, The first light source assembly includes an excitation light source and / or a target light source, wherein the excitation light emitted from the excitation light source and / or the light emitted from the target light source are used as excitation light to excite the wavelength conversion device.

22. The light source system according to claim 1, characterized in that, The wavelength conversion device further includes a reflection region, which is any one of the following: a reflection element, a polished metal layer or metal plate, a substrate coated with a reflection film, particles with diffuse reflection, a microstructured reflection layer, or a reflective diffuser. The optical axis of the excitation light emitted from the first light source assembly is offset from the optical axis of the shaping lens group. The light source system also includes a fifth beam splitter element, which transmits the primary color light emitted from the second light source assembly and reflects the excitation light reflected by the reflection area of ​​the wavelength conversion device. The reflected excitation light is then incident on the uniform light element.

23. The light source system according to claim 1, characterized in that, The first light source component and the wavelength conversion device are integrated into a CG LED. The light source system also includes an R LED, a second light splitter and combiner, and a target light splitter. The light splitter and combiner are arranged crosswise with the second light splitter and combiner. The second light-splitting and light-combining element transmits the primary color light emitted from the second light source assembly and the green LED light emitted from the CG LED, and reflects the red LED light emitted from the R LED; The light splitter and combiner transmits the primary color light emitted from the second light source assembly and the red LED light emitted from the R LED, and reflects the green LED light emitted from the CG LED; The target beam splitter transmits red LED light and reflects some of the green LED light transmitted from the beam splitter and combiner.

24. A projection device, characterized in that, The light source system included in any one of claims 1-23.

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