Illuminating system and illuminating equipment

Abstract

The invention relates to the technical field of display, and discloses an illumination system and illumination equipment, in the illumination system, excited light and primary light emitted by a second light source assembly are combined and then emitted, and the problems of speckles, color edge ghosting and uneven color mixing can be solved; furthermore, during light combination, part of stimulated light does not enter the light uniformizing element, the light recycling assembly can enable the part of light to circulate between the wavelength conversion device and the light splitting and combining element, and finally the part of light enters the light uniformizing element to serve as emergent light, so that the light combination efficiency is improved; and finally, when the wavelength conversion device is excited, part of exciting light remains, and the light recycling assembly can re-irradiate the residual exciting light into the wavelength conversion device for re-excitation, so that the excitation efficiency can be improved, and the lighting effect of the lighting equipment is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lighting technology, in particular to a lighting system and a lighting device. BACKGROUND

[0002] In an image display product, a lighting system is a very important component, and its function is to convert light of different colors, different angular distributions, different brightnesses and different shapes into a uniform light spot irradiated to the effective area of a display chip.

[0003] A laser light source is the main light source of most image display products at present, and has the advantages of high brightness, wide color gamut and clear image, but has the disadvantage that the reflection of a high-coherence laser light on the surface of a displayed image will produce speckle phenomenon, affecting the viewing experience. Using a short-wavelength laser light to excite fluorescence and then combining the fluorescence with the laser light is a common technique that can supplement brightness and reduce laser speckle. However, the excitation efficiency of the laser light to excite fluorescence is low, and the combining efficiency of the fluorescence with the laser light is also low. SUMMARY

[0004] The present application provides a lighting system that can be used in a lighting device, can improve the excitation efficiency and the combining efficiency, and can reduce speckle, color edge ghosting and color unevenness after the base color light emitted by the excited light and the second light source assembly is combined.

[0005] In a first aspect, the present application provides a lighting system, the lighting system comprising a first light source assembly, a second light source assembly, a light splitting and combining element, a wavelength conversion device, a light recycling assembly, a shaping lens group and a light homogenizing element, the first light source assembly being capable of emitting excitation light, the second light source assembly being capable of emitting at least one base color light, the light recycling assembly comprising a target reflecting element, wherein:

[0006] The base color light emitted by the second light source assembly is incident on the light homogenizing element after passing through the light splitting and combining element, and is emitted after being homogenized by the light homogenizing element;

[0007] The excitation light emitted by the first light source assembly is incident on the wavelength conversion device after passing through the light splitting and combining element and the shaping lens group, or the excitation light emitted by 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 excited light and residual excitation light, and the excited light and the residual excitation light are both incident on the shaping lens group;

[0008] The target stimulated light in the stimulated light is transmitted by the light splitting and combining element and then enters the target reflecting element. The target reflecting element reflects the target stimulated light back to the light splitting and combining element, which is transmitted by the light splitting and combining element and then enters the wavelength conversion device through the shaping lens group. The first stimulated light and the 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, and the polarization state of the first stimulated light is different from that of the second stimulated light. The first stimulated light is transmitted by the shaping lens group and the light splitting and combining element and then enters the light homogenizing element for light homogenization. The second stimulated light is transmitted by the light splitting and combining element and then enters the light recycling assembly, and the cycle is repeated. The target stimulated light is the light in the stimulated light that has the same wavelength band and polarization state as the base color light emitted by the second light source assembly. The remaining stimulated light in the stimulated light is transmitted by the light splitting and combining element and then enters the light homogenizing element, which homogenizes the light and then emits it.

[0009] The residual excitation light is shaped by the shaping lens group and the light splitting and combining element and then enters the target reflecting element. The target reflecting element reflects the residual excitation light back to the wavelength conversion device for re-excitation.

[0010] In some embodiments, the target reflecting element includes a light splitting region that transmits the excitation light emitted by the first light source assembly and reflects the target stimulated light, or transmits the excitation light emitted by the first light source assembly and reflects the residual excitation light and the target stimulated light. The light splitting region is a through hole or a substrate coated with an anti-reflection film or a dichroic lens.

[0011] In some embodiments, the light splitting and combining element can transmit blue light of a first wavelength band, green light of a first polarization state of a second wavelength band, red light of a third wavelength band, or red light of a first polarization state of a third wavelength band, and reflect green light of a second polarization state of the second wavelength band and / or red light of a second polarization state of the third wavelength band and light of the remaining wavelength bands.

[0012] The second wavelength band of the first polarization state of the light in the stimulated light and / or the third wavelength band of the first polarization state of the light in the stimulated light is transmitted by the light splitting and combining element. The second wavelength band of the second polarization state of the light in the stimulated light and / or the third wavelength band of the second polarization state of the light in the stimulated light, and the light of the remaining wavelength bands are reflected by the light splitting and combining element. The target stimulated light includes the second wavelength band of the first polarization state of the light in the stimulated light and / or the third wavelength band of the first polarization state of the light in the stimulated light.

[0013] In some embodiments, the base color light emitted by the second light source assembly is green laser light, red laser light, and blue laser light of a first polarization state, and the light splitting and combining element transmits the green laser light, the red laser light, and the blue laser light of the first polarization state.

[0014] In addition, when the excitation light emitted by the first light source assembly is blue laser light, the polarization state of the blue laser light is the same as that of the blue laser light emitted by the second light source assembly.

[0015] In some embodiments, the second light source assembly emits red laser light, and the second light source assembly comprises a first laser light source and a second laser light source which are independent of each other, and a light guide assembly, the first laser light source and the second laser light source are arranged opposite to each other;

[0016] The first light spot of the red laser light emitted by the first laser light source and the second light spot of the red laser light emitted by the second laser light source are guided by the light guide assembly to form a side-by-side light spot, in the side-by-side light spot, the long axis of the first light spot is parallel to the long axis of the second light spot, and the short axis of the first light spot is on the same straight line as the short axis of the second light spot.

[0017] And / or, the first laser light source and the second laser light source also emit blue laser light and green laser light, the distance between the position where the first laser light source and / or the second laser light source emits the red laser light and the light emitting side of the light source assembly is shorter than the distance between the position where the first laser light source and / or the second laser light source emits the blue laser light and the green laser light and the light emitting side of the light source assembly.

[0018] In some embodiments, the surface of the target reflective element close to the side of the light splitting and light combining element is a plane, and the residual excitation light and / or the target stimulated light is vertically incident on the target reflective element.

[0019] In some embodiments, the surface of the target reflective element close to the side of the light splitting and light combining element is a curved surface.

[0020] In some embodiments, the wavelength conversion device comprises a conversion region, the target stimulated light is incident on the conversion region to cause diffuse reflection, change the polarization state of part of the target stimulated light, and obtain the first stimulated light.

[0021] In some embodiments, the optical axis of the excitation light emitted by the first light source assembly coincides with the optical axis of the shaping lens group, and the light splitting region is the middle region of the target reflective element.

[0022] Alternatively, 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, and the light splitting region is on or close to either end of the target reflective element.

[0023] In a second aspect, the present application provides a lighting device comprising the lighting system of the first aspect and any one of the possible implementation manners of the first aspect.

[0024] The illumination system provided in the application can reduce speckle, color edge ghosting and color unevenness by combining the primary light emitted by the second light source assembly and the stimulated light; further, part of the stimulated light does not enter the light homogenizing element when the light is combined, and the light recycling assembly can make the light circulate between the wavelength conversion device and the light splitting and combining element, and finally enter the light homogenizing element as the emitted light, thereby improving the light combining efficiency; finally, when the wavelength conversion device is excited, part of the excited light remains, the light recycling assembly can re-emit the remaining excited light into the wavelength conversion device for re-excitation, thereby improving the excitation efficiency and the light efficiency of the illumination device. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description of embodiments of the present application taken in conjunction with the accompanying drawings. The drawings provided in the present application are used to provide further understanding of the embodiments of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation of the present application. In the drawings, the same reference numerals generally represent the same components or steps. Among them:

[0026] Figure 1 FIG. 1 is a structural schematic diagram of an illumination system in an embodiment of the present application;

[0027] Figure 2 FIG. 2 is a partial structural schematic diagram of a second light source assembly in an embodiment of the present application;

[0028] FIG. 3 is a structural schematic diagram of a second light source assembly in an embodiment of the present application;

[0029] Figure 4a FIG. 4 is a structural schematic diagram of an illumination system in another embodiment of the present application;

[0030] Figure 4b FIG. 5 is a structural schematic diagram of an illumination system in another embodiment of the present application;

[0031] Figure 5 FIG. 6 is a structural schematic diagram of an illumination system in another embodiment of the present application;

[0032] Figure 6 FIG. 7 is a structural schematic diagram of an illumination system in another embodiment of the present application;

[0033] Figure 7 FIG. 8 is a structural schematic diagram of an illumination system in another embodiment of the present application;

[0034] Figure 8 FIG. 9 is a structural schematic diagram of an illumination system in another embodiment of the present application;

[0035] Figure 9 FIG. 10 is a structural schematic diagram of an illumination system in another embodiment of the present application;

[0036] Figure 10 Structure diagram of a lighting system in another embodiment of the application;

[0037] Figure 11 Structure diagram of a lighting system in another embodiment of the application;

[0038] Figure 12 Structure diagram of a lighting device in an embodiment of the application. DETAILED DESCRIPTION

[0039] In order to make personnel in the technical field better understand the technical solutions in the application, the technical solutions in the embodiments of the application will be clearly and completely described below in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. It should be understood that the specific embodiments described herein are only used to explain the application, and should not be used to limit the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work should belong to the protection scope of the application. In addition, although the disclosure is introduced according to one or more examples, it should be understood that each aspect of the disclosure can also constitute a complete technical solution independently. The embodiments described below and the features in the embodiments can be combined with each other without conflict.

[0040] In the embodiments of the application, the words “example”, “for example”, and the like are used to represent an example, illustration, or description. Any embodiment or design scheme described as “example” in the application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word “example” is intended to present the concept in a specific manner.

[0041] Unless otherwise defined, the technical terms or scientific terms used in the application should be understood as the general meaning understood by a person with ordinary skills in the art to which the application belongs. In the application, the words “first”, “second”, and the like do not represent any order, quantity, or importance, but are only used to distinguish the description. The words “include” or “contain” and the like mean that the elements or objects before the words cover the elements or objects listed after the words 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.

[0042] In order to thoroughly understand the application, a detailed description will be provided below to explain the technical solutions of the application. The preferred embodiments of the application are described in detail as follows, however, in addition to these detailed descriptions, the application can also have other implementation manners.

[0043] This embodiment provides a lighting system. Figure 1 The present application provides a schematic diagram of the structure of a lighting system, such as... Figure 1 The lighting system shown includes a first light source assembly 01, a second light source assembly 02, a light splitter and combiner element 12, a wavelength conversion device 16, a light reuse assembly, shaping lens groups 14 and 15, and a light homogenizing element 23. The first light source assembly emits excitation light, the second light source assembly emits at least one primary color light, and the light reuse assembly is disposed between the first light source assembly and the light splitter and combiner element, or the elements in the light reuse assembly are disposed on at least two sides of the light splitter and combiner element, wherein:

[0044] 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.

[0045] The excitation light emitted from the first light source assembly is transmitted into 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 transmitted into the wavelength conversion device; when the wavelength conversion device is excited by the transmitted excitation light, the light emitted from the wavelength conversion device includes the excited light and the residual excitation light, and both the excited light and the residual excitation light are transmitted toward the shaping lens group.

[0046] The stimulated light is directed into the beam splitter and combiner through the shaping lens group, then into the beam homogenizer, and finally emitted after being homogenized by the beam homogenizer.

[0047] The residual excitation light is shaped by a shaping lens group and then enters the beam splitter and beam combiner and the light reuse assembly. After passing through the light reuse assembly and the beam splitter and beam combiner, it can be re-excited by the wavelength conversion device. By re-exciting the residual excitation light into the wavelength conversion device, the excitation efficiency can be improved.

[0048] 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.

[0049] Optionally, the light-diffusing element can be a single-sided compound eye, a double-sided compound eye, or a light bar, etc.

[0050] 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 system includes 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 lighting system. 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 light splitting and combining element and the homogenizing element, such as... Figure 1The middle element 19 can change the polarization state of the light to be injected into the light homogenizing element, and in combination with a subsequent spatial light modulator, the problem of brightness uniformity is improved.

[0051] Optionally, the distance between the wavelength conversion device and the light splitting and combining element is less than a preset distance, and the preset distance is set according to actual application conditions, so that the entire system has a small volume and a compact structure.

[0052] In some embodiments, as shown in (b) of FIG. 3, the first light source assembly 01 includes an excitation light source 17, and the excitation light source and the excitation light are not limited; the excitation light source can be an LED or a laser LD and other new light sources, or a hybrid light source of an LED and a 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 a light-emitting chip array.

[0053] For example, the excitation light source can be a blue laser LD, and the excitation light can be a blue laser with a wavelength range not limited, such as a wavelength of 430 nm-480 nm; or the main wavelength of the blue laser is 455 nm. For another example, the excitation light source is a blue LED, and the excitation light is a blue LED light, and at this time the wavelength conversion device is a wavelength conversion sheet, which can be a static fluorescent sheet (such as a yellow, green, orange, red, orange fluorescent sheet), and the blue LED light emitted by the blue LED is used as excitation light to excite the wavelength conversion sheet.

[0054] Optionally, the first light source assembly includes a target light source, and the wavelength conversion device is a wavelength conversion sheet, and the light emitted by the target light source is used as excitation light to excite the wavelength conversion sheet; for example, the target light source can also be a blue LED light source. It can be understood that the target light source can be integrated with the wavelength conversion sheet, such as being integrated with a green fluorescent sheet as a CG LED or being integrated with a yellow fluorescent sheet as a YLED, etc. At this time, the target reflecting element can be a total reflection mirror, which reflects the part of the green LED light (i.e. the target excited light) not guided to the light splitting and combining element by the light splitting and combining element back to the light splitting and combining element when the green LED light generated by the CG LED and the primary color light emitted by the second light source assembly are combined, and the light splitting and combining element guides the green LED light to the CG LED again for diffuse reflection. Figure 4a As shown, the target light source 03 and the wavelength conversion device 16 are integrated into a CG LED, and the target reflecting element can be a total reflection mirror 31, which can be a planar type or a curved type. Or the target light source 03 is a blue LED light source, and the CG LED integrated with the wavelength conversion device 16, and the target light source 03 can be guided to be injected into the wavelength conversion device 16 through a guiding element (not shown in the figure).

[0055] Optionally, the first light source assembly comprises an excitation light source and a target light source. For example, the excitation light source is a blue LED, and the blue LED light emitted by the blue LED and the light emitted by the target light source are both used to excite the wavelength conversion sheet from both sides. The target light source can be integrated with the wavelength conversion sheet, such as a CG LED and a Y LED. For another example, the excitation light source and the target light source are both blue laser light LDs, and the wavelength conversion device is a transmission type fluorescent wheel. As shown in FIG. 16, a film layer that transmits blue light and reflects excited light is arranged on the side of the conversion area of the fluorescent wheel close to the target light source 03, and the two blue laser light LDs excite the conversion area from both sides. A focusing lens group can be arranged between the target light source 03 and the fluorescent wheel 16. Alternatively, the excitation light source 17 is a blue LED light source, and a focusing lens is arranged on the light emitting side of the excitation light source 01. The target light source 03 and the wavelength conversion device 16 are integrated into a CG LED. Figure 4b

[0056] In some embodiments, the base color light emitted by the second light source assembly 02 is not limited and can include at least one of red light, green light, and blue light. The light source in the second light source assembly is not limited and can be an LED or a laser light LD and other new light sources, or a mixed light source of an LED and a laser light LD, etc.

[0057] Optionally, the second light source assembly comprises at least one of a blue laser light source, a red laser light source, and a green laser light source. The number of light emitting chips in each laser light source is not limited and can be a single light emitting chip or a light emitting chip array. Optionally, the polarization state of each color laser light emitted by each laser light source is not limited and can be P state or S state.

[0058] For example, the base color light emitted by the second light source assembly includes green laser light, red laser light, and blue laser light of a first polarization state, and the light splitting and combining element transmits the green laser light, the red laser light, and the blue laser light of the first polarization state. The first polarization state is not limited and can be P state or S state. The polarization state of the red laser light and the polarization state of the blue laser light can be the same as or different from the polarization state of the green laser light. The wavelength of the blue laser light is not limited, for example, the main wavelength of the blue laser light is 455 nm.

[0059] Optionally, when the excitation light emitted by the first light source assembly is blue laser light, the polarization state of the blue laser light is the same as the polarization state of the blue laser light emitted by the second light source assembly and can be P state or S state, for example, it can be P state.

[0060] Optionally, as shown in FIG. 3(a), the second light source assembly 02 comprises a first laser light source 1 and a second laser light source 2. When the first laser light source and / or the second laser light source comprises 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 6A-8A. The first laser light source and the second laser light source break through the limitation of the power supply current, so that the blue light in the illumination system is sufficient, and a better light combining ratio can be achieved.​

[0061] 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.

[0062] 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.

[0063] 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 side-by-side light spots. In the side-by-side light spots, 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 spots can be relatively small, which can reduce the size of subsequent components and thus reduce the volume of the lighting system.

[0064] 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 laser in the lighting system and reducing the size of the lighting system.

[0065] 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 lighting system.

[0066] Optionally, 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. Heat dissipation can be better, the light emitted by the illumination system is stable, and the image quality can be improved. In addition, a larger power supply voltage can be provided for the light-emitting chip, thereby improving the brightness of the illumination device. Optionally, in order to enable the excitation light emitted by the first light source assembly and the laser light emitted by the second light source assembly to enter the light splitting and combining element, a reflecting element 9, a shaping lens group 10, etc. can also be arranged on the light emitting side of each light source assembly. It should be noted that the shaping lens group mentioned in the present application can include one or more lenses, which can be spherical lenses or aspherical lenses, and the curvature parameters thereof can be set according to actual application conditions.

[0067] Optionally, as shown in FIG. 3, a first speckle suppression element 18 is arranged on the light emitting side of the first light source assembly 01, and / or a second speckle suppression element 11 is arranged on the light emitting side of the second light source assembly 02. The first speckle suppression element and the second speckle suppression element can be a diffusion sheet, a diffusion wheel, an ommatidium, a dynamic dispersion element (LSR), etc. The first speckle suppression element and the second speckle suppression element can perform light homogenization on the excitation light and the laser light, thereby making the light spot distribution entering the light homogenization element more uniform, thereby improving the speckle problem. Optionally, the laser light emitted by the first laser light source and the second laser light source can enter the dynamic dispersion element 7 after being combined by the light guide assembly, thereby suppressing the speckle.

[0068] Optionally, as shown in FIG. 3(a), the second light source assembly 02 further includes a third laser light source 34, the third laser light source 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. The light guide assembly further includes a reflecting element 36 at this time, and the reflecting elements 3 and 4 need to be replaced by dichroic elements; or, the third laser light source is located in the middle of the first laser light source and the second laser light source, and transmits through the middle of the elements 3 and 4 to combine with the blue laser light emitted by the first laser light source and the second laser light source. Optionally, a polarization conversion element 35 can also be arranged on the light emitting side of the third laser light source, which converts the polarization state of the blue laser light to meet the needs of the subsequent optical path. By adding a blue laser light source, the heat dissipation pressure of the first laser light source and the second laser light source can be reduced, and the brightness of the illumination device can be improved.

[0069] Optionally, the second light source assembly 02 includes a first ommatidium 8, and the light homogenization element is a second ommatidium; the incident angle of the light emitted by the second light source assembly entering the first ommatidium is greater than the incident angle of the light entering the second ommatidium; the first ommatidium can be a hexagonal glass ommatidium, and the second ommatidium can be a double-sided ommatidium; light homogenization can be better performed.

[0070] Optionally, the incident angle of the light incident into the second compound eye is less than a preset angle threshold. The preset angle threshold is not limited, for example, can be 10 degrees, etc. The light is incident into the second compound eye through a smaller angle, which can be more uniform, thereby inhibiting speckle problems, and making the image quality of the illumination device more uniform. It should be noted that if the light homogenizing element is a light rod, the above-mentioned limitation on the incident angle of the light can not be met.

[0071] In some embodiments, the wavelength conversion device comprises at least one conversion region, the conversion region of the wavelength conversion device comprising a transmittance layer, a wavelength conversion layer and a reflection layer; the excitation light is incident into the wavelength conversion layer through the transmittance layer, and the wavelength conversion layer is excited by the excitation light to generate the stimulated light, and the stimulated light is reflected by the reflection layer and then emitted.

[0072] Optionally, the reflection layer can be a heat dissipation substrate coated with a reflective film, such as a white layer of diffuse reflection printed on the heat dissipation substrate, which reflects blue light and fluorescent light. The diffuse reflection white layer is composed of glue and nano reflective powder, the glue is organic glue or inorganic glue, 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 metal aluminum substrate. The thickness of the heat dissipation substrate is about 0.5 mm. The energy of the excitation light incident from the transmittance layer into the wavelength conversion layer accounts for more than 90% of the total energy, preferably more than 98%. The reflection layer can diffuse the incident light, and the incident excitation light can be returned to the wavelength conversion layer for excitation, which can improve the excitation efficiency.

[0073] Optionally, the wavelength conversion layer has a wavelength conversion material, which can be a phosphor or a fluorescent powder, for example, a yellow phosphor that emits yellow light when excited, such as a yttrium aluminum garnet (YAG) phosphor containing cerium (Ce) as an activator, or a green fluorescent powder, a red fluorescent powder, a yellow fluorescent powder, an orange fluorescent powder, an orange fluorescent powder, a green fluorescent powder, etc. Optionally, the conversion region can include a first region and a second region, each region corresponding to a wavelength conversion material, and at least one wavelength band of the color light different from the wavelength band of the excitation light can be generated, i.e. the stimulated light can be at least one of yellow fluorescence, red fluorescence, green fluorescence, orange fluorescence, orange fluorescence, and green fluorescence. For example, the wavelength conversion layer of the first region (G region) is mixed with green or green fluorescent powder and organic glue, and green or green fluorescence is generated when excited; the green fluorescent powder is aluminate, silicate or β-sialon green fluorescent powder, and the organic glue is high temperature silicone or epoxy glue. The wavelength conversion layer of the second region (R region) is mixed with yellow or orange or red fluorescent powder and organic glue, and yellow or red or orange or yellow fluorescence is generated when excited; the red fluorescent powder is nitride, silicate or α-sialon red fluorescent powder, the orange fluorescent powder is a mixture of yellow fluorescent powder and red fluorescent powder, or a silicate orange fluorescent powder, and the organic glue is high temperature silicone or epoxy glue.

[0074] Optionally, the anti-reflection layer is glass or sapphire or silicon carbide coated with an anti-reflection film, or a nano-SiO2 film layer, or a light splitting sheet. Optionally, the anti-reflection film is coated on the outer surface of the sapphire, and the inner surface is glued to the wavelength conversion layer; the thickness is 0.2mm-1mm, preferably 0.4mm; if the blue laser directly irradiates the sapphire, the sapphire has good temperature resistance, and the excitation light is incident on the wavelength conversion layer through the sapphire, which can improve the radiation power density resistance of the wavelength conversion layer. The anti-reflection layer transmits blue light, and the difference between the refractive indices of the anti-reflection layer and the wavelength conversion layer is less than a preset threshold value, which can be set according to actual application, for example, 0-0.5, preferably 0-0.2, for example, the refractive indices of the anti-reflection layer and the wavelength conversion layer are both 1.5-1.7. The proportion of the excitation light in the light emitted from the fluorescent layer to the anti-reflection layer is greater than a preset proportion threshold value; the preset proportion threshold value is not limited, for example, it can be 97%. Therefore, the proportion of blue light in the light emitted by the wavelength conversion device can be reduced when the blue light is incident on the wavelength conversion layer, that is, the residual blue light can be reduced, and the color gamut of the lighting device can be improved.

[0075] Optionally, each conversion region of the wavelength conversion device corresponds to one excitation light, and a light filtering element is arranged on the light emitting side of each conversion region to filter the corresponding excitation light; wherein the light filtering element can be a light filter or a film layer coated on the light emitting side surface of the wavelength conversion device, such as a film coated on the anti-reflection layer. Assuming that the first region and the second region are included, the first region generates green fluorescent light, and the second region emits red fluorescent light, the light filtering element arranged on the light emitting side of the first region filters green fluorescent light, and the light filtering element arranged on the light emitting side of the second region filters red fluorescent light. Optionally, the transmittance of the light transmitted from the anti-reflection layer is greater than 98%, the transmittance of the light reflected from the anti-reflection layer is less than 2%, and the transmittance of the light partially transmitted and partially reflected from the anti-reflection layer is 50%.

[0076] For example, in the first region, the light in the wavelength band of 400nm-561nm is transmitted, the transmittance T is greater than 98%; the light in the wavelength band of 595nm±4nm is partially transmitted and partially reflected, the transmittance T is 50%; the light in the wavelength band of 615nm-700nm is reflected, the transmittance T is less than 2%. In the second region, the light in the wavelength band of 400nm-465nm is transmitted, the transmittance T is greater than 98%; the light in the wavelength band of 470nm±4nm is partially transmitted and partially reflected, the transmittance T is 50%; the light in the wavelength band of 489nm-592nm is reflected, the transmittance T is less than 2%; the light in the wavelength band of 616nm-693nm is transmitted, the transmittance T is greater than 98%. That is, the first anti-reflection layer can transmit blue light and green light (short wave) and reflect red light (long wave), and the second anti-reflection layer can transmit blue light and red light and reflect green light; the anti-reflection layer and the light filtering film layer coated on the anti-reflection layer can transmit blue light and the required fluorescent light, and reflect the unnecessary fluorescent light, thereby improving the color gamut.

[0077] Optionally, the conversion region in the wavelength conversion device is provided with phosphor, and the proportion of the corresponding phosphor in each conversion region is within a preset proportion range, and the thickness of the phosphor is within a preset thickness range. The preset proportion range and the preset thickness range are not limited, for example, the thickness of the phosphor can be 0.1mm-0.25mm, preferably 0.15mm-0.2mm; the proportion of the phosphor to the organic glue is 2.5:1-3.5:1. By adjusting the concentration and thickness of the phosphor, the proportion of the residual excitation light can be changed.

[0078] In some embodiments, when the excited light passes through the light splitting and combining element, the target excited light enters the light recycling assembly, the target excited light is the light in the excited light whose wavelength band coincides with the wavelength band of the primary color light emitted by the second light source assembly and whose polarization state is the first polarization state; the light recycling assembly reflects the target excited light back to the light splitting and combining element, the target excited light passes through the light splitting and combining element and the shaping lens group and enters the wavelength conversion device; the first excited light and the second excited light are emitted from the wavelength conversion device, the polarization state of the second excited light is the same as that of the target excited light, and the polarization state of the first excited light is different from that of the second excited light; the first excited light passes through the shaping lens group and the light splitting and combining element and enters the light homogenizing element for light homogenization; the second excited light passes through the light splitting and combining element and enters the light recycling assembly, and the cycle is repeated. Therefore, when the light splitting and combining element combines the primary color light and the excited light, the excited light that cannot enter the light homogenizing element is reflected by the light recycling assembly to the wavelength conversion device, processed by the wavelength conversion device, and then enters the light splitting and combining element again, and part of the light can be used as the emitted light of the illumination system, so that the light can be processed in a cycle, thereby improving the light combining efficiency and the brightness of the illumination device.

[0079] Optionally, the target excited light entering the conversion region of the wavelength conversion device can be diffusely reflected, so that the polarization state of part of the target excited light can be changed. For example, the conversion region includes phosphor, and the surface of the phosphor is rough particles, and the target excited light entering the surface of the phosphor can be diffusely reflected, so that the polarization state of part of the target excited light can be changed.

[0080] Optionally, as Figure 1As shown, the light recycling assembly can include a target light splitting element 31, which can transmit the excitation light generated by the first light source assembly and reflect the target stimulated light, so as to reflect the stimulated light to the light splitting and combining element. The target light splitting element 31 can include a target area, which can be a through hole, a substrate coated with an anti-reflection film, a transmissive diffuser, a dichroic lens, a transmissive diffuser, etc. When the target area is a through hole or a substrate coated with an anti-reflection film, the excitation light generated by the first light source assembly can pass through the target area and enter the light splitting and combining element. When the target area is a dichroic mirror, the dichroic mirror can transmit the excitation light generated by the first light source assembly and reflect the target stimulated light. The surface of the target light splitting element 31 close to the light splitting and combining element is a curved surface, such as a curved mirror with a through hole or a curved mirror with a dichroic mirror as the light splitting area.

[0081] In some embodiments, the light splitting and combining element can transmit blue light of a first wave band, green light of a first polarization state of a second wave band, red light of a third wave band, or red light of a first polarization state of a third wave band, and reflect green light of a second polarization state of the second wave band and / or red light of a second polarization state of the third wave band, and light of the remaining wave bands. The light of the second polarization state of the second wave band in the stimulated light and / or the light of the second polarization state of the third wave band in the stimulated light, and the light of the remaining wave bands, are reflected by the light splitting and combining element and enter the light homogenizing element. The light splitting and combining element transmits the excitation light and the target stimulated light, and the target stimulated light includes the light of the first polarization state of the second wave band in the stimulated light and / or the light of the first polarization state of the third wave band in the stimulated light. The light splitting and combining element can be a substrate coated with a film on one side or a substrate coated with a film on both sides. The first wave band, the second wave band, and the third wave band are not limited, for example, the first wave band is 430-490 nm, the second wave band is 510-540 nm, and the third wave band is 625-680 nm. The second polarization state is not limited and can be S state or P state. By using the light splitting and combining element to combine the primary color light and the stimulated light, the light combining efficiency can be improved, thereby improving the brightness of the illumination device.

[0082] For example, the excitation light is blue laser, the second light source assembly emits blue laser, red laser and green laser, the excited light includes green / yellow fluorescence and red / yellow fluorescence, the first polarization state is P state; the film coated on the light splitting and combining element can transmit blue light with a wavelength range of 430-490 nm, P state green light with a wavelength range of 510-540 nm and red light with a wavelength range of 625-680 nm or P state red light with a wavelength range of 625-680 nm, and reflect light with other wavelength ranges and polarization states; assuming that the conversion region includes yellow phosphor and the excited light is yellow fluorescence with a wavelength range of 500-680 nm, the P state light with a wavelength range of 510-540 nm and the light with a wavelength range of 625-680 nm or the P state red light with a wavelength range of 625-680 nm in the yellow fluorescence are transmitted by the light splitting and combining element, the S state light with a wavelength range of 510-540 nm and / or the S state red light with a wavelength range of 625-680 nm are reflected by the light splitting and combining element, and the light with other wavelength ranges is also reflected. That is, all the S state fluorescence and 35% of the P state fluorescence in the excited light (fluorescence) are reflected to the light homogenizing element as the outgoing light of the illumination system, and about 15% of the P state fluorescence is transmitted out of the light splitting and combining element; therefore, the light recycling assembly can make the 15% of the P state fluorescence re-enter the wavelength conversion device, and due to the diffuse reflection effect, about 7.5% of S state and 7.5% of P state are generated after reflection, wherein the 7.5% of S state is reflected to the light homogenizing element by the light splitting and combining element, and the 7.5% of P state is re-entered the wavelength conversion device as the same as the previous P state fluorescence, and is re-entered the wavelength conversion device by the same way. It should be noted that due to the circulation, the P state in the fluorescence is all converted to S state, and if the subsequent spatial light modulator is set to LCOS or LCD and the like, the incident light side can not need to set a PBS or PCS or the like, and the device can be reduced under the condition of maintaining high brightness.

[0083] Optionally, the excitation light is blue laser, the second light source assembly emits blue laser and red laser, and the excited light includes green / yellow fluorescence and red / yellow fluorescence; the polarization state of the blue laser and the red laser is S state or P state, the wavelength range of the red laser does not coincide or partially coincides with that of the red / yellow fluorescence, and the light splitting and light combining element transmits the blue laser and the red laser in S state and / or P state and transmits part of the P state light or S state light in the red / green / yellow fluorescence and reflects the rest of the light. For example, the film coated on the light splitting and light combining element can transmit the blue light in P state with a wavelength range of 440-485 nm and / or in S state with a wavelength range of 455-495 nm, the red light in P state with a wavelength range of greater than 610 nm and / or in S state with a wavelength range of greater than 620 nm, and reflect the rest of the light. Assuming that the excited light is yellow fluorescence with a wavelength range of 500-680 nm, the P state light in the yellow fluorescence with a wavelength range of 610-620 nm is transmitted by the light splitting and light combining element, the S state light with a wavelength range of 610-620 nm is reflected by the light splitting and light combining element, and the rest of the light is also reflected, and the target excited light includes the P state light with a wavelength range of 610-620 nm.

[0084] In some embodiments, as Figure 1 Optionally, the wavelength conversion device 16 and the light splitting and light combining element 12 are provided with a color filter element 30 and a driving device. When the first preset condition is met, the driving device drives the color filter element to be located in the light path of the excited light, so as to filter the excited light. When the second preset condition is met, the driving device drives the color filter element to be not located in the light path of the excited light. The first preset condition can be that the color gamut is detected to be lower than the minimum standard value (which can be a preset value in the lighting device) or the lighting device receives a color gamut instruction indicating that the user needs to display an image with a better color gamut. The second preset condition can be that the brightness is lower than the minimum standard value (which can be a preset value in the lighting device) or the lighting device receives a brightness instruction indicating that the user needs to display an image with better brightness. Optionally, the wavelength conversion device and the light splitting and light combining element are provided with a color filter element, which filters the excited light. That is, the color filter element 30 can also be static and always located in the light path to filter the excited light, so as to improve the color gamut of the lighting system.

[0085] In some embodiments, the light recycling assembly can include but is not limited to the following implementations:

[0086] Optionally, 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, the polarization state of the excitation light emitted by the first light source assembly is the first polarization state; and the light recycling assembly is arranged between the first light source assembly and the light splitting and light combining element.

[0087] Optionally, the light recycling assembly is arranged between the first light source assembly and the light splitting and light combining element. Figure 1As 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.

[0088] Method 2, such as Figure 5 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.

[0089] 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;

[0090] 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 6 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.

[0091] 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 7 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.

[0092] 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.

[0093] In the fifth mode, the residual excitation light is injected into the first reflective element through the light splitting and combining element, the first reflective element reflects the residual blue light back to the light splitting and combining element, and then the residual blue light is injected into the wavelength conversion device for re-excitation. Figure 8 The first reflective element 37 can be a small mirror.

[0094] Optionally, the optical axis of the first reflective element is symmetric to the optical axis of the excitation light emitted by the first light source assembly relative to the optical axis of the shaping lens group. This can make the first reflective element reflect as much residual excitation light as possible back to the light splitting and combining element, thereby improving the re-excitation efficiency, and can increase the luminous flux gain of the excited light emitted by the illumination system by 6% to 13%.

[0095] Optionally, the long side of the first reflective element is greater than or equal to the long axis of the spot of the residual excitation light, and the short side of the first reflective element is greater than or equal to the short axis of the spot of the residual excitation light. Controlling the size of the first reflective element can reflect as much residual excitation light as possible while reducing the volume of the illumination system.

[0096] In the schemes shown in modes one to four, the light recycling assembly includes a target light splitting element 31. In schemes one and two, the target light splitting element 31 transmits the excitation light emitted by the first light source and reflects the target excited light, or in schemes three, four and five, the target light splitting element 31 transmits the excitation light emitted by the first light source and reflects the target excited light. The light recycling assembly can simultaneously achieve recycling of the fluorescent light and re-excitation of the blue light, improve the light combining efficiency and excitation efficiency, and thereby improve the light efficiency of the illumination system.

[0097] In the sixth mode, 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 recycling assembly includes a target reflective element, and the target reflective element includes a light splitting region. Optionally, the light splitting region is at or near either end of the target reflective element. Optionally, the light splitting region can be a through hole, a substrate coated with an anti-reflection film, a dichroic lens, or a transmissive diffuser. The light splitting region transmits the excitation light emitted by the first light source assembly, or the light splitting region is a dichroic lens that transmits the excitation light emitted by the first light source assembly and reflects the target excited light. The other regions reflect the residual excitation light and the target excited light, and the other regions can be total reflection regions such as mirrors, diffusive mirrors, etc. The excitation light emitted by the first light source assembly is transmitted through the light splitting region of the target reflective element, and the residual excitation light and the target excited light are injected into the target reflective element through the light splitting and combining element. The target excited light is reflected back to the light splitting and combining element by the target reflective element, and the residual excitation light is reflected back to the light splitting and combining element by the light splitting region of the target reflective element. For example, as shown in Figure 9As shown, part of the upper end of the target reflective element 38 (light splitting region) transmits the excitation light emitted by the first light source assembly and reflects the target stimulated light, and part of the lower end (other region) reflects the residual excitation light. This way uses fewer devices while ensuring high excitation efficiency and light combining efficiency.

[0098] In the seventh way, the optical axis of the excitation light emitted by the first light source assembly coincides with the optical axis of the shaping lens group, and the light recycling assembly includes a target reflective element, which includes a light splitting region that is the middle region of the target reflective element. Optionally, the light splitting region can be a through hole, a substrate coated with an antireflection film, a dichroic lens, or a transmissive diffuser. When the light splitting region is a dichroic lens, the light splitting region transmits the excitation light emitted by the first light source assembly and reflects the target stimulated light, and the other region reflects the residual excitation light and the target stimulated light. Alternatively, when the light splitting region is a through hole, a substrate coated with an antireflection film, or a transmissive diffuser, the light splitting region transmits the excitation light emitted by the first light source assembly, and the other region reflects the residual excitation light and the target stimulated light. The other region can be a total reflection region, such as a mirror, a diffuse mirror, etc.

[0099] The excitation light emitted by the first light source assembly is transmitted through the light splitting region. After the residual excitation light and the target stimulated light enter the target reflective element through the light splitting and combining element, the target stimulated light is reflected back to the light splitting and combining element by the target reflective element, and the residual excitation light is reflected back to the light splitting and combining element by the other region of the target reflective element. Figure 10 As shown, the light recycling assembly includes a target reflective element 39, the middle region (light splitting region) of which transmits the excitation light emitted by the first light source assembly and the residual blue light, and the other region (which can be a total reflection region) reflects the residual excitation light and the target stimulated light. This way uses fewer devices while ensuring high excitation efficiency and light combining efficiency.

[0100] Optionally, the surface of the target reflective element close to the light splitting and combining element is curved. For example, the middle region of the curved mirror has a through hole, the middle region of the curved mirror is a dichroic mirror, the middle region of the curved mirror is a transmissive diffuser, the middle region of the curved mirror is coated with an antireflection film, the middle region of the curved mirror is a planar mirror with a through hole, the two end regions of the curved mirror are arc-shaped mirrors, or the middle region of the curved mirror is a planar mirror with an included angle. The surface of the target reflective element close to the light splitting and combining element can be spherical or aspherical. Figure 10As shown, a target reflective element 39 of a curved surface is shown. Since the target excited light and the residual blue light are emitted from the wavelength conversion device at an angle with the optical axis of each element, the adoption of the target reflective element of the curved surface makes the light have a focusing trend, and is re-emitted into the wavelength conversion device, which can improve the fluorescent light recycling efficiency and the efficiency of re-excitation of the residual blue light.

[0101] Optionally, the surface of the target reflective element close to the light splitting and combining element is a plane, and the residual excitation light and / or the target excited light is vertically incident into the target reflective element. It can be understood that the vertical incidence here can be the vertical incidence within an error angle range, for example, within 0-5 degrees. The incidence angle of the light incident into the target reflective element can be controlled by setting the parameters of the focusing lens group and the incidence angle of the excitation light into the wavelength conversion device, and the vertical incidence can reduce the light loss at the target reflective element, improve the fluorescent light recycling efficiency and the efficiency of re-excitation of the residual blue light.

[0102] Optionally, the target reflective element can further include two light splitting elements with an included angle of 90 degrees, which can be set as an adjustable mechanism, and the included angle between the two light splitting elements is fixed, and only the intersecting axis needs to be adjusted to ensure that the incident light and the emitted light are parallel. The two light splitting elements can include a light splitting element 1 and a light splitting element 2, and a gap can be left between the light splitting element 1 and the light splitting element 2, and the excitation light emitted by the first light source assembly is incident into the light splitting and combining element through the gap. The target excited light and the residual blue light are incident into the light splitting element 1, reflected into the light splitting element 2 through the light splitting element 1, and reflected into the light splitting and combining element through the light splitting element 2; and / or, the target excited light and the residual blue light are incident into the light splitting element 2, reflected into the light splitting element 1 through the light splitting element 2, and reflected into the light splitting and combining element through the light splitting element 1. Optionally, the target reflective element can also be a triple prism with three reflecting surfaces perpendicular to each other.

[0103] In some embodiments, the wavelength conversion device further includes a transmission region, and the illumination system further includes a reflective guiding assembly for guiding the excitation light transmitted by the transmission region to the light homogenizing element as the excitation light of the illumination system; that is, the excitation light as the emitted light is different from the light path of the residual excitation light after passing through the wavelength conversion device, which can make full use of the residual excitation light for re-excitation, and can also utilize the excitation light as the emitted light, thereby improving the brightness of the illumination device. For example, as shown in Figure 11 The reflective guiding assembly can include reflective elements 43 and 44, and the element 21 can transmit the excitation light generated by the first light source assembly, and reflect the primary color light and the excited light generated by the second light source assembly, such as transmitting blue laser with a main wavelength of 455 nm, and reflecting blue laser, red laser, green laser and yellow fluorescent light with a main wavelength of 466 nm.

[0104] In summary, the lighting system provided by the present application, when the light combining element combines the primary color light and the excited light, part of the excited light that cannot enter the light homogenizing element as the outgoing light of the lighting system is reflected to the wavelength conversion device through the light recycling assembly, and then re-enters the light combining element after being processed by the wavelength conversion device. Part of the light can then be used as the outgoing light of the lighting system, so that it can be recycled and processed, thereby improving the light combining efficiency and the brightness of the lighting device. After the excited light and the primary color light emitted by the second light source assembly are combined, the problems of speckle, colored edge ghosting, and color unevenness can be reduced. Furthermore, when the wavelength conversion device is excited, part of the excited light will remain. The light recycling assembly can re-emit the remaining excited light into the wavelength conversion device for re-excitation, which can improve the fluorescence excitation efficiency and thus improve the light efficiency of the lighting device.

[0105] Figure 12 A functional module diagram of a lighting device provided by the present application is shown in FIG. 1. As shown in FIG. 1, the lighting device includes an image processor 101 and a display light engine 102. Wherein: Figure 12

[0106] 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.

[0107] The display light engine 102 can include a driving chip, a spatial light modulator, and the lighting system described in the above embodiments, etc. Wherein, the spatial light modulator can be a Digtial Micromirror Devices (DMD), a Liquid Crystal Display (LCD), a Liquid Crystal on Silicon (LCOS), etc. The driving chip corresponds to the spatial light modulator, for example, the DMD can be driven by a Digital Light Processing (DLP). The display light engine 102 is used to project the image to be displayed into a display image.

[0108] ​In some embodiments, the lighting device further comprises a central controller 103 of one or more processing cores, which can be a CPU, an ARM, an MCU, or the like. The central controller 103 is the control center of the lighting device, which connects various parts of the lighting device through various interfaces and lines, can run or execute software programs and / or operating systems stored in the memory 104, and call data stored in the memory 104. Optionally, the image processor 101 and the central controller 103 can be integrated into one processor.

[0109] In some embodiments, the lighting device further comprises a memory 104 of one or more computer-readable storage media, an input module 105, and a communication module 106, a power supply 107, and the like. Those skilled in the art can understand that the lighting device structure shown in the figure does not constitute a limitation on the lighting device, which can include more or fewer components than shown, or combine certain components, or different component arrangements. Among them: Figure 12

[0110] The memory 104 can be used to store software programs and operating systems, and the central controller 103 can execute various functional applications and data processing by running the software programs and operating systems stored in the memory 104. The memory 104 can mainly include a program storage area and a data storage area, wherein the program storage area can store the operating system, at least one application program required by the function (such as sound playing function, image playing function, etc.), and the like; the data storage area can store data created according to the use of the lighting device, etc. In addition, the memory 104 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory device. Accordingly, the memory 104 can also include a memory controller to provide the central controller 103 with access to the memory 104.

[0111] The lighting device can 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 input related to user settings and function control.

[0112] The lighting device can also include a communication module 106, which in some embodiments can include a wireless module. The lighting device can perform short-range wireless transmission through the wireless module of the communication module 106, thereby providing the user with wireless broadband Internet access. For example, the communication module 106 can be used to help the user access streaming media, etc.

[0113] ​The lighting device also includes a power source 107 to power the various components, which in some embodiments can be logically connected to the central controller 103 through a power management system, enabling the power management system to manage charging, discharging, and power consumption management, among other functions. The power source 107 can also include one or more DC or AC power sources, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and any other components.

[0114] The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting thereof. The use of the terms "including," "comprising," or "having" in the description herein also is not limiting of any embodiment. The terms "consisting of" and / or "consisting essentially of' when used in the following description and claims, mean open-ended processes that do not preclude the addition of insubstantial changes. The description herein of any embodiments, including preferred embodiments, is intended for purposes of illustration, demonstration, and teaching, and the present application is not limited to or by one or more specific embodiments, but rather includes any modification or alternative that is reasonably inferable therefrom.

[0115] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A lighting system, characterized in that, The lighting system includes a first light source assembly, a second light source assembly, a light splitting and combining element, a wavelength conversion device, a light reuse assembly, a shaping lens group, and a light homogenizing element. The first light source assembly emits excitation light, the second light source assembly emits at least one primary color light, and the light reuse assembly includes a target reflection element, wherein: The primary color light emitted from the second light source assembly 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 through 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 and residual excitation light, and both the excited light and the residual excitation light are incident on the shaping lens group. The stimulated light from the target is transmitted through the beam splitter and combiner and then enters the target reflector. The target reflector reflects the stimulated light back to the beam splitter and combiner, and then enters the wavelength conversion device through the beam splitter and combiner and the shaping lens group. 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 is transmitted through the shaping lens group and the beam splitter and combiner and then 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 is transmitted through the beam splitter and combiner and then enters the homogenizing element for homogenization before exiting. The residual excitation light is shaped by the shaping lens group and the beam splitter and combiner before being incident on the target reflector; it is then reflected back to the wavelength conversion device for re-excitation.

2. The lighting system according to claim 1, characterized in that, The target reflective element includes a beam-splitting region, which transmits the excitation light emitted from the first light source component and reflects the target stimulated light, while other regions reflect the residual excitation light and the target stimulated light; or the beam-splitting region transmits the excitation light emitted from the first light source component and other regions reflect the residual excitation light and the target stimulated light; the beam-splitting region is a through hole or a substrate coated with an antireflection film or a dichroic lens.

3. The lighting 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 first polarization state in the second band and / or the light of the first polarization state in the third band of the stimulated light are transmitted through the light splitting and combining element; the light of the second polarization state in the second band 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; the target stimulated light includes the light of the first polarization state in the second band and / or the light of the first polarization state in the third band of the stimulated light.

4. The lighting system according to claim 1, characterized in that, The primary color light emitted by the second light source component is 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.

5. The lighting 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.

6. The lighting system according to claim 1, characterized in that, The surface of the target reflective element near the light splitting and combining element is a plane, and the residual excitation light and / or the target excited light are perpendicularly incident on the target reflective element.

7. The lighting system according to claim 1, characterized in that, The surface of the target reflective element near the light-splitting and light-combining element is curved.

8. The lighting system according to claim 1, characterized in that, The wavelength conversion device includes a conversion region. When the target stimulated light enters the conversion region, it undergoes diffuse reflection, which changes the polarization state of a portion of the target stimulated light to obtain the first stimulated light.

9. The lighting system according to claim 2, characterized in that, The optical axis of the excitation light emitted from the first light source assembly coincides with the optical axis of the shaping lens group, and the beam-splitting region is the middle region of the target reflective element; Alternatively, 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, and the beam splitting region is on either end of the target reflective element or near either end of the target reflective element.

10. A lighting device, characterized in that, The lighting system comprising any one of claims 1-9.

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