Light source system and projection device

Abstract

A light source system and a projection device. In the light source system, excited light and primary color light emitted by a second light source assembly (02) are combined and then emitted, such that the problems of speckles, color edge ghosting, and color unevenness can be reduced; furthermore, when a wavelength conversion device (16) is excited, part of the excited light remains, and a light reuse assembly can re-emit the residual excited light into the wavelength conversion device (16) for re-excitation, such that the excitation efficiency can be improved, thereby improving the light efficiency of the projection device.

Description

Light source system and projection device TECHNICAL FIELD

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

[0002] In a projection display product, a light source 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 uniform light spots that are irradiated to the effective area of a display chip.

[0003] A laser light source is the main light source of most current projection display products, and has the advantages of high brightness, wide color gamut and bright images. However, the laser light has a high degree of coherence, and the reflection of the laser light on a projection surface will produce speckle phenomenon, which affects the visual effect. A common technique is to use short-wavelength laser light to excite fluorescent light, and then combine the laser light with the fluorescent light. This technique can supplement the brightness and reduce the speckle of the laser light. However, the excitation efficiency of the laser light to excite the fluorescent light is relatively low. SUMMARY

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

[0005] In a first aspect, the present application provides a light source system,

[0006] The light source system includes 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 can emit excitation light, the second light source assembly can emit at least one base color light, and the light recycling assembly is arranged between the first light source assembly and the light splitting and combining element, or an element in the light recycling assembly is arranged on at least two sides of the light splitting and combining element.

[0007] 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, is homogenized by the light homogenizing element, and is then emitted.

[0008] 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 both the excited light and the residual excitation light are incident on the shaping lens group.

[0009] The excited light is incident on the light splitting and combining element after passing through the shaping lens group, is incident on the light homogenizing element after passing through the light splitting and combining element, is homogenized by the light homogenizing element, and is then emitted.

[0010] The residual excitation light is shaped by the shaping lens group and then enters the light splitting and combining element and the light recycling assembly, and can re-enter the wavelength conversion device for re-excitation through the light recycling assembly and the light splitting and combining element.

[0011] 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, the light recycling assembly is arranged between the first light source assembly and the light splitting and combining element.

[0012] The light recycling assembly comprises a first polarization conversion element and a polarization separation element, and the polarization state of the excitation light emitted by the first light source assembly is a first polarization state; the excitation light of the first polarization state emitted by the first light source assembly passes through the polarization separation element and the first polarization conversion element when entering the wavelength conversion device; the residual excitation light enters the light recycling assembly through the light splitting and combining element, first passes through the first polarization conversion element and then enters the polarization separation element, the polarization state of the residual excitation light 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, and can re-enter the wavelength conversion device for re-excitation through the first polarization conversion element and the light splitting and combining element.

[0013] Alternatively, the light recycling assembly comprises a first polarization conversion element, a first light splitting element and a second reflection element, and the polarization state of the excitation light emitted by the first light source assembly is a first polarization state; the residual excitation light enters the light recycling assembly through the light splitting and combining element, first passes through the first polarization conversion element and then enters the first light splitting element, the polarization state of the residual excitation light 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 light splitting element and then enters the second reflection element, is reflected by the second reflection element back to the first light splitting element, is reflected by the first light splitting element again and then enters the first polarization conversion element, and can re-enter the wavelength conversion device for re-excitation through the first polarization conversion element and the light splitting and combining element.

[0014] In some embodiments, if the optical axis of the excitation light emitted by the first light source assembly deviates from the optical axis of the shaping lens group, the light recycling assembly comprises a first reflection element.

[0015] The residual excitation light enters the first reflection element through the light splitting and combining element, the first reflection element reflects the residual blue light back to the light splitting and combining element, and then the residual excitation light re-enters the wavelength conversion device for re-excitation.

[0016] In some embodiments, the optical axis of the first reflection element is symmetrical to the optical axis of the excitation light emitted by the first light source assembly with respect to the optical axis of the shaping lens group.

[0017] And / or, the long side of the first reflection element is greater than or equal to the long axis of the light spot of the residual excitation light, and the short side of the first reflection element is greater than or equal to the short axis of the light spot of the residual excitation light.

[0018] In some embodiments, the elements in the light recycling assembly are arranged on at least two sides of the light splitting and combining element; the polarization state of the excitation light emitted by 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 a second polarization state;

[0019] The light recycling assembly comprises a first polarization conversion element and a second light splitting element; the excitation light of the first polarization state emitted by the first light source assembly passes through the first polarization conversion element when entering the wavelength conversion device; the residual excitation light passes through the shaping lens group and enters the first polarization conversion element, the polarization state of the residual excitation light 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 the light splitting and combining element, is reflected by the light splitting and combining element, enters the second light splitting element, is reflected by the second light splitting element back to the light splitting and combining element, and then enters the light splitting and combining element and the first polarization conversion element again to be re-excited in the wavelength conversion device; wherein the second light splitting element transmits the light of the first polarization state and reflects the light of the second polarization state, or the second light splitting element reflects the light with a target wavelength as the main wavelength, and the excitation light emitted by the first light source assembly has the target wavelength as the main wavelength;

[0020] Alternatively, the light recycling assembly comprises a first polarization conversion element, a third light splitting element and a second reflecting element, the excitation light of the first polarization state emitted by the first light source assembly passes through the first polarization conversion element when entering the wavelength conversion device; the residual excitation light passes through the shaping lens group and enters the first polarization conversion element, the polarization state of the residual excitation light 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 the light splitting and combining element, is reflected by the light splitting and combining element, enters the third light splitting element, is reflected by the third light splitting element, enters the second reflecting element, is reflected by the second reflecting element back to the third light splitting element, is reflected by the third light splitting element again, enters the light splitting and combining element, and then enters the light splitting and combining element and the first polarization conversion element again to be re-excited in the wavelength conversion device.

[0021] In some embodiments, when the excited light passes through the light splitting and combining element, the target excited light enters the light recycling assembly, and the target excited light is the light in the excited light whose wavelength band coincides with that of the primary color light emitted by the second light source assembly and whose polarization state is the first polarization state;

[0022] The light recycling assembly reflects the target excited light back to the light splitting and combining element, and the target excited light enters the wavelength conversion device through the light splitting and combining element and the shaping lens group;

[0023] 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 the polarization state of the target stimulated light, and the polarization state of the first stimulated light is different from the polarization state of the second stimulated light; the first stimulated light is emitted into the light homogenizing element through the shaping lens group and the light splitting and combining element for light homogenization; and the second stimulated light is emitted into the light recycling assembly after being transmitted through the light splitting and combining element, and circulates through the light recycling assembly.

[0024] In some embodiments, the light recycling assembly comprises a target light splitting element;

[0025] The target light splitting element transmits the excitation light emitted by the first light source and reflects the target stimulated light.

[0026] Alternatively, the target light splitting element transmits the excitation light and the residual excitation light emitted by the first light source and reflects the target stimulated light.

[0027] In some embodiments,

[0028] 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 comprises a target reflecting element, the target reflecting element comprises a target area that reflects the residual excitation light, and other areas of the target reflecting element transmit the excitation light emitted by the first light source assembly and reflect the target stimulated light.

[0029] 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 light recycling assembly comprises a fourth light splitting element, the fourth light splitting element comprises a light splitting area that is a through hole, a substrate coated with an anti-reflection film, or a dichroic lens; the light splitting area transmits the excitation light emitted by the first light source assembly and reflects the target stimulated light, other areas of the light splitting area reflect the residual excitation light and the target stimulated light, or the light splitting area transmits the excitation light emitted by the first light source assembly and other areas of the light splitting area reflect the residual excitation light and the target stimulated light.

[0030] 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 other wavelength bands.

[0031] In this case, the excitation light, the light of the first polarization state of the second wavelength band in the stimulated light, and / or the light of the first polarization state of the third wavelength band in the stimulated light are transmitted through the light splitting and combining element; the light of the second polarization state of the second wavelength band in the stimulated light and / or the light of the second polarization state of the third wavelength band in the stimulated light, and light of other wavelength bands are reflected by the light splitting and combining element; and the target stimulated light comprises the light of the first polarization state of the second wavelength band in the stimulated light and / or the light of the first polarization state of the third wavelength band in the stimulated light.

[0032] 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.

[0033] And / or, 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.

[0034] 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 independent of each other, and a light guide assembly, the first laser light source and the second laser light source are oppositely arranged;

[0035] 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 and the short axis of the second light spot are on a straight line.

[0036] 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 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 blue laser light and green laser light and the light emitting side of the light source assembly.

[0037] In some embodiments, the second light source assembly further comprises a third laser light source, 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.

[0038] 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.

[0039] In some embodiments, a first speckle suppression element is arranged on the light emitting side of the first light source assembly, and / or a second speckle suppression element is arranged on the light emitting side of the second light source assembly.

[0040] In some embodiments, the second light source assembly comprises a first compound eye, and the light homogenizing element is a second compound eye.

[0041] The angle of incidence of the light emitted by the second light source assembly into the first compound eye is greater than the angle of incidence of the light into the second compound eye.

[0042] And / or, the angle of incidence of the light into the second compound eye is less than a preset angle threshold.

[0043] In some embodiments, the wavelength conversion device comprises at least one conversion region, each conversion region 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.

[0044] And / or, the wavelength conversion device further comprises a transmission region, and the light source system further comprises a reflection guiding component, the reflection guiding component being configured to guide the excitation light transmitted by the transmission region to the light homogenizing element.

[0045] In some embodiments, the wavelength conversion device comprises conversion regions, and phosphors are arranged in the conversion regions, the proportion of the corresponding phosphor in each conversion region is within a preset proportion range, and the thickness of the corresponding phosphor in each conversion region is within a preset thickness range.

[0046] In some embodiments, a color filter element and a driving device are arranged between the wavelength conversion device and the light splitting and combining element, the driving device drives the color filter element to be located in the light path of the excitation light to filter the excitation light when the first preset condition is met, and the driving device drives the color filter element not to be located in the light path of the excitation light when the second preset condition is met.

[0047] Alternatively, a color filter element is arranged between the wavelength conversion device and the light splitting and combining element, and the color filter element filters the excitation light.

[0048] In some embodiments, the second light source assembly comprises a first laser light source and a second laser light source, and when the first laser light source and / or the second laser light source comprises four red laser light emitting chips, three green laser light emitting chips and two 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.

[0049] In some embodiments,

[0050] The first light source assembly comprises an excitation light source and / or a target light source, and the excitation light emitted by the excitation light source and / or the light emitted by the target light source is used to excite the wavelength conversion device.

[0051] In the second aspect, the present application provides a projection device, comprising the light source system in any one of the first aspect and the possible implementation manners of the first aspect.

[0052] In the light source system provided by the present application, the excitation light and the primary color light emitted by the second light source assembly are combined and emitted, which can reduce the problems of speckle, colored edge ghosting and color unevenness; when the wavelength conversion device is excited, part of the excitation light remains, and the light reuse component can re-emit the remaining excitation light into the wavelength conversion device for re-excitation, which can improve the excitation efficiency and thus improve the light efficiency of the projection device. BRIEF DESCRIPTION OF DRAWINGS

[0053] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description thereof taken in conjunction with the accompanying drawings, in which:

[0054] Fig. 1 is a schematic diagram of a light source system according to an embodiment of the present application;

[0055] Fig. 2 is a schematic diagram of a second light source assembly according to an embodiment of the present application;

[0056] Fig. 3 is a schematic diagram of the second light source assembly according to an embodiment of the present application;

[0057] Fig. 4 is a schematic diagram of a light source system according to another embodiment of the present application;

[0058] Fig. 5 is a schematic diagram of a light source system according to another embodiment of the present application;

[0059] Fig. 6 is a schematic diagram of a light source system according to another embodiment of the present application;

[0060] Fig. 7 is a schematic diagram of a light source system according to another embodiment of the present application;

[0061] Fig. 8 is a schematic diagram of a light source system according to another embodiment of the present application;

[0062] Fig. 9 is a schematic diagram of a light source system according to another embodiment of the present application;

[0063] Fig. 10 is a schematic diagram of a light source system according to another embodiment of the present application;

[0064] Fig. 11 is a schematic diagram of a light source system according to another embodiment of the present application;

[0065] Fig. 12 is a schematic diagram of a projection apparatus according to an embodiment of the present application. DETAILED DESCRIPTION

[0066] In order to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and should not be used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work should be within the scope of protection of the present 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.

[0067] In the embodiments of the present application, the words such as "example", "for example" are used to represent as an example, illustration or description. Any embodiment or design scheme described as "example" in the present 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 way.

[0068] Unless otherwise defined, the technical terms or scientific terms used in the present application should be understood as the general meaning understood by those skilled in the art in the field to which the present application belongs. The "first", "second" and similar words used in the present application do not represent any order, number or importance, but are only used to distinguish the description. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word 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.

[0069] In order to thoroughly understand the present application, a detailed description will be provided below in order to explain the technical solutions of the present application. The preferred embodiments of the present application are described in detail as follows, however, in addition to these detailed descriptions, the present application can also have other implementation manners.

[0070] The present embodiment provides a light source system, Fig. 1 is a structural schematic diagram of a light source system provided by the present application, as shown in Fig. 1, the light source system comprises 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 recycling assembly, a shaping lens group 14 and 15 and a light homogenizing element 23, the first light source assembly can emit excitation light, the second light source assembly can emit at least one primary color light, the light recycling assembly is arranged between the first light source assembly and the light splitting and combining element, or the elements in the light recycling assembly are arranged on at least two sides of the light splitting and combining element, wherein:

[0071] The primary color light emitted by the second light source assembly is incident on the light homogenizing element through the light splitting and combining element, and is emitted after being homogenized by the light homogenizing element;

[0072] The excitation light emitted by the first light source assembly is incident on the wavelength conversion device 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 stimulated light and residual excitation light, and the stimulated light and the residual excitation light are both incident on the shaping lens group;

[0073] The stimulated light is incident on the light splitting and combining element through the shaping lens group, is incident on the light homogenizing element through the light splitting and combining element, and is emitted after being homogenized by the light homogenizing element;

[0074] The residual excitation light is shaped by the shaping lens group and is incident on the light splitting and combining element and the light recycling assembly, and is incident on the wavelength conversion device again through the light recycling assembly and the light splitting and combining element to be re-excited. By re-exciting the residual excitation light into the wavelength conversion device, the excitation efficiency can be improved.

[0075] Optionally, the stimulated light is broadband light, and the primary color light emitted by the second light source is narrowband light. After the stimulated 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.

[0076] Optionally, the light homogenizing element can be a single-faced compound eye or a double-faced compound eye or a light rod, etc.

[0077] Optionally, a reflecting element, a shaping lens group, etc. can be arranged between the light splitting and combining element and the light homogenizing element, such as the reflecting element 21, the shaping lens group 20, and the shaping lens group 22 in FIG. 1. The reflecting element can make the volume of the light source system smaller by turning the light path, and the shaping lens group can shape the light to be incident on the light homogenizing element into collimated light, and the light spot incident on the light homogenizing element can be more uniform. Optionally, a 1 / 4 wave plate can be arranged between the light splitting and combining element and the light homogenizing element, such as the element 19 in FIG. 1, which can change the polarization state of the light to be incident on the light homogenizing element, and in combination with a subsequent spatial light modulator, the problem of brightness unevenness can be improved.

[0078] 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 the actual application, which can make the entire system smaller in volume and more compact in structure.

[0079] 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.

[0080] For example, the excitation light source can be a blue laser LD, and the excitation light can be blue laser light, the wavelength range of which is not limited, for example, the wavelength is 430nm-480nm; or the main wavelength of the blue laser light is 455nm. For another example, the excitation light source is a blue LED, and the excitation light is blue LED light, 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, or orange fluorescent sheet), and the blue LED light emitted by the blue LED is used as excitation light to excite the wavelength conversion sheet.

[0081] 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, and 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 Y LED.

[0082] Optionally, the first light source assembly includes 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 used as excitation light to double-sidedly excite the wavelength conversion sheet, and 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 LDs, and the wavelength conversion device is a transmission type fluorescent wheel, as shown in FIG. 4, a film layer that transmits blue light and reflects excited light is arranged in the conversion area of the fluorescent wheel close to the target light source 03 side, and the two blue laser LDs double-sidedly excite the conversion area, and a focusing lens group can be arranged between the target light source 03 and the fluorescent wheel 16.

[0083] 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 LD and other new light sources, or a mixed light source of an LED and a laser LD, etc.

[0084] Optionally, the second light source assembly includes 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.

[0085] For example, the base color light emitted by the second light source assembly includes green laser, red laser and blue laser of the first polarization state, and the light splitting and combining element transmits the green laser, red laser and blue laser 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 and the blue laser can be the same as or different from that of the green laser. The wavelength of the blue laser is not limited, for example, the main wavelength of the blue laser is 455 nm.

[0086] Optionally, when the excitation light emitted by the first light source assembly is blue laser, the polarization state thereof is the same as that of the blue laser emitted by the second light source assembly, and can be P state or S state, for example, can be P state.

[0087] Optionally, as shown in (a) of FIG. 3, the second light source assembly 02 includes the first laser light source 1 and the second laser light source 2, and 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 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 light source system is sufficient, and a better light combining ratio can be achieved.

[0088] Optionally, a polarization conversion element can be arranged on the light emitting side of each color laser light source to change the polarization state of each color laser light to meet the needs of the subsequent optical path. The polarization conversion element can be a half-wave plate, a 1 / 4 wave plate, etc. For example, as shown in (a) of FIG. 3, the second light source assembly 02 can be provided with polarization conversion elements 24, 25 and 26 corresponding to the first laser light source 1, and polarization conversion elements 27, 28 and 29 corresponding to the second laser light source 2.

[0089] Optionally, the second light source assembly emits red laser light, and the second light source assembly includes mutually independent first and second laser light sources and a light guide assembly, and the first and second laser light sources are oppositely arranged. The light guide assembly can include but is not limited to reflecting elements, dichroic elements, etc.; for example, as shown in (a) of FIG. 3, the light guide assembly includes reflecting elements 3 and 4, and dichroic elements 5 and 6.

[0090] 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 which 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. Therefore, the side-by-side light spot can be relatively small, and the size of the subsequent element can be reduced, thereby reducing the volume of the light source system.

[0091] The long sides of the first laser light source and the second laser light source are parallel to the optical axis of the laser light beams emitted by the second light source assembly; the first laser light source and the second laser light source are each provided with at least two columns of light emitting chips in a first direction, each column of light emitting chips is provided with a plurality of light emitting chips in a second direction, and the long sides of the side-by-side light spots of the laser light beams are related to the length of each column of light emitting chips in the second direction, wherein the first direction corresponds to the long sides of the first laser light source and the second laser light source, and the second direction corresponds to the short sides of the first laser light source and the second laser light source. As shown in FIG. 2, a partial structure diagram of a second light source assembly provided in the embodiment is shown, which shows the arrangement of the first laser source and the second laser source; in the embodiment, the spacing between the light spots of the laser light beams emitted by the first laser light source and the second laser light source can reach 3mm or 2mm, or even smaller, and the spacing between the light spots of the laser light beams is further shortened by the arrangement of the light emitting chips, thereby improving the utilization rate of the laser in the light source system and reducing the volume of the light source system.

[0092] Optionally, the first laser light source and the second laser light source also emit blue light and green light, and the distance between the position where the first laser light source and / or the second laser light source emits red 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 blue light and green light and the light emitting side of the light source assembly. The red laser has a larger divergence angle, and being close to the light emitting side can reduce the volume of the light source system.

[0093] 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 light source system is stable, and the image quality can be improved. Moreover, a larger power supply voltage can be provided for the light emitting chips, thereby improving the brightness of the projection 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 respective light emitting sides. 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.

[0094] 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 diffusion sheets, diffusion wheels, compound eyes, dynamic dispersion elements (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.

[0095] Optionally, as shown in (a) of FIG. 3, the second light source assembly 02 further comprises a third laser light source 34, the third laser light source emits blue laser light, and the light guide assembly is configured 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 further comprises a reflective element 36, in which the reflective elements 3 and 4 are replaced by dichroic elements; or the third laser light source is located between the first and second laser light sources, and the blue laser light emitted by the third laser light source is combined with the blue laser light emitted by the first and second laser light sources through the middle of the elements 3 and 4. 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 subsequent light path requirements. By adding a blue laser light source, the heat dissipation pressure of the first and second laser light sources can be reduced, and the brightness of the projection device can be improved.

[0096] Optionally, the second light source assembly 02 comprises a first fly-eye 8, and the light homogenizing element is a second fly-eye; the incident angle of the light emitted by the second light source assembly into the first fly-eye is greater than the incident angle of the light into the second fly-eye; the first fly-eye can be a hexagonal glass fly-eye, and the second fly-eye can be a double-sided fly-eye; the light can be better homogenized.

[0097] Optionally, the incident angle of the light into the second fly-eye is less than a preset angle threshold. The preset angle threshold is not limited, for example, it can be 10 degrees, etc. The light enters the second fly-eye at a smaller angle, which can be more uniform, thereby suppressing speckle problems and making the image quality of the projection 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.

[0098] In some embodiments, the wavelength conversion device comprises at least one conversion region, the conversion region of the wavelength conversion device comprises an antireflection layer, a wavelength conversion layer and a reflective layer; the excitation light enters the wavelength conversion layer after passing through the antireflection layer, and the wavelength conversion layer is excited by the excitation light to generate stimulated light, and the stimulated light is emitted after being reflected by the reflective layer.

[0099] Optionally, the reflective layer can be a heat dissipation substrate coated with a reflective film, such as a diffuse reflective white layer printed on the heat dissipation substrate, which reflects blue light and fluorescent light. The diffuse reflective 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 antireflection layer to the wavelength conversion layer accounts for more than 90% of the total energy, and preferably more than 98%. The reflective layer can diffuse the incident light, and the incident excitation light can be returned to the wavelength conversion layer for excitation, thereby improving the excitation efficiency.

[0100] Optionally, the wavelength conversion layer has a wavelength conversion material, which can be a phosphor or a fluorescent powder, such as a yellow phosphor that is excited to emit yellow light, such as a yttrium aluminum garnet (YAG) phosphor containing cerium (Ce) as an activator, or a green phosphor, a red phosphor, a yellow phosphor, an orange phosphor, an orange-red phosphor, a cyan phosphor, etc. Optionally, the conversion region can include a first region and a second region, each region corresponding to a wavelength conversion material, and can generate at least one color light having a wavelength different from that of the excitation light, i.e., the excited light can be at least one of yellow light, red light, green light, orange-red light, orange light, and cyan light. For example, the wavelength conversion layer of the first region (G region) is mixed with green or cyan fluorescent powder and organic glue, and is excited to generate green or cyan fluorescence; the green fluorescent powder is an aluminate, a silicate, or a 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-red or red fluorescent powder and organic glue, and is excited to generate yellow or red or orange or yellow fluorescence; the red fluorescent powder is a nitride, a silicate, or an α-sialon red fluorescent powder, the orange-red fluorescent powder is a mixture of yellow fluorescent powder and red fluorescent powder, or a silicate orange-red fluorescent powder, and the organic glue is high-temperature silicone or epoxy glue.

[0101] Optionally, the antireflection layer is glass or sapphire or silicon carbide coated with an antireflection film, or a nano-SiO2 film layer, or a light splitting sheet. Optionally, the antireflection film is coated on the outer surface of the sapphire, and the inner surface is glued to the wavelength conversion layer; the thickness is 0.2-1 mm, and is preferably 0.4 mm; for example, the blue laser can directly irradiate 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 antireflection layer transmits blue light, and the difference between the refractive indices of the antireflection 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, and is preferably 0-0.2, for example, the refractive indices of the antireflection layer and the wavelength conversion layer are both 1.5-1.7. The proportion of the excited light in the light emitted from the fluorescent layer to the antireflection 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 reflected blue light can be reduced when the blue light is incident on the wavelength conversion layer, thereby reducing the proportion of blue light in the light emitted by the wavelength conversion device, i.e., reducing residual blue light, and the color gamut of the projection equipment can be improved.

[0102] Optionally, each conversion region of the wavelength conversion device corresponds to a stimulated light, and a light filtering element is arranged on the light emitting side of each conversion region to filter the corresponding stimulated light; wherein the light filtering element can be a 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 wavelength conversion device includes a first region and a second region, the first region generates green fluorescence, and the second region emits red fluorescence, the light filtering element arranged on the light emitting side of the first region filters the green fluorescence, and the light filtering element arranged on the light emitting side of the second region filters the red fluorescence. 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%.

[0103] For example, the first region transmits light in the wavelength band of 400 nm-561 nm with a transmittance T greater than 98%; partially transmits and partially reflects light in the wavelength band of 595 nm±4 nm with a transmittance T of 50%; and reflects light in the wavelength band of 615 nm-700 nm with a transmittance T less than 2%. The second region transmits light in the wavelength band of 400 nm-465 nm with a transmittance T greater than 98%; partially transmits and partially reflects light in the wavelength band of 470 nm±4 nm with a transmittance T of 50%; reflects light in the wavelength band of 489 nm-592 nm with a transmittance T less than 2%; and transmits light in the wavelength band of 616 nm-693 nm with a transmittance T 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 fluorescence and reflect the unnecessary fluorescence, thereby improving the color gamut.

[0104] Optionally, the conversion region in the wavelength conversion device is provided with fluorescent powder, and the proportion of the corresponding fluorescent powder in each conversion region is within a preset proportion range, and the thickness is within a preset thickness range. The preset proportion range and the preset thickness range are not limited, for example, the thickness of the fluorescent powder can be 0.1 mm-0.25 mm, and preferably 0.15 mm-0.2 mm; and the proportion of the fluorescent powder to the organic glue is 2.5:1-3.5:1. By adjusting the concentration and thickness of the fluorescent powder, the proportion of the residual stimulated light can be changed.

[0105] In some embodiments, when the stimulated light is incident on the light splitting and combining element, the target stimulated light, which is the light in the stimulated light having a wavelength range overlapping with that of the primary color light emitted by the second light source assembly and having a first polarization state, is incident on the light recycling assembly. The light recycling assembly reflects the target stimulated light back to the light splitting and combining element, which is incident on the wavelength conversion device through the light splitting and combining element and the shaping lens group. The first stimulated light and the second stimulated light are emitted from the wavelength conversion device, the second stimulated light having the same polarization state as the target stimulated light, and the first stimulated light having a different polarization state from the second stimulated light. The first stimulated light is incident on the light homogenizing element through the shaping lens group and the light splitting and combining element for light homogenization. The second stimulated light is transmitted through the light splitting and combining element and is incident on the light recycling assembly, which is recycled in this way. Thus, when the light splitting and combining element combines the primary color light and the stimulated light, part of the stimulated light that cannot enter the light homogenizing element as the emitted light of the light source system is reflected by the light recycling assembly to the wavelength conversion device, is processed by the wavelength conversion device, and is incident on the light splitting and combining element again, part of which can be used as the emitted light of the light source system, so that it can be recycled and processed, thereby improving the light combining efficiency and the brightness of the projection device.

[0106] Optionally, the target stimulated light incident on the wavelength conversion device can be diffusely reflected, so that the polarization state of part of the target stimulated light can be changed. For example, the surface of the phosphor is a rough particle, and the target stimulated light incident on the surface of the phosphor can be diffusely reflected, so that the polarization state of part of the target stimulated light can be changed.

[0107] Optionally, as shown in FIG. 1, 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 that the stimulated light is reflected to the light splitting and combining element.

[0108] In some embodiments, the light-splitting and light-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 the first polarization state of the third wavelength band, 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; the light of the second polarization state of the second wavelength band in the excitation light and / or the light of the second polarization state of the third wavelength band in the excitation light, and the light of the remaining wavelength bands, after being reflected by the light-splitting and light-combining element, enter the light-uniformizing element; the light-splitting and light-combining element transmits the excitation light and target excitation light, and the target excitation light includes the light of the first polarization state of the second wavelength band in the excitation light and / or the light of the first polarization state of the third wavelength band in the excitation light. The light-splitting and light-combining element can be single-sidedly coated or double-sidedly coated. The first wavelength band, the second wavelength band and the third wavelength band 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 S state or P state. By using the light-splitting and light-combining element to combine the primary color light and the excitation light, the light-combining efficiency can be improved, and thus the brightness of the projection device can be improved.

[0109] 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 into the light homogenizing element as the outgoing light of the light source 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 obtained after reflection, wherein the 7.5% of S state is reflected by the light splitting and combining element into the light homogenizing element, and the 7.5% of P state is the same as the previous P state fluorescence light path and re-enters the wavelength conversion device, and the cycle is repeated. It should be noted that due to the cycle, the P state in the fluorescence is completely converted to the 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 be provided with a PBS or PCS and the like, and the device can be reduced while maintaining high brightness.

[0110] 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, transmits part of the P state light or S state light in the red / green / yellow fluorescence, and reflects the light in the remaining wavelength range and polarization state. 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 light in the remaining wavelength range. 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 light in the remaining wavelength range is also reflected, and the target excited light includes the P state light with a wavelength range of 610-620 nm.

[0111] In some embodiments, as shown in FIG. 1, a color filter element 30 and a driving device are arranged between the wavelength conversion device 16 and the light splitting and light combining element 12. 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 that the excited light is filtered; 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 projection device) or the projection device receives a color gamut instruction indicating that the user needs to project a picture with 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 projection device) or the projection device receives a brightness instruction indicating that the user needs to project a picture with better brightness. Optionally, a color filter element is arranged between the wavelength conversion device and the light splitting and light combining element, and the color filter element 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 light source system.

[0112] In some embodiments, the light recycling assembly can include, but is not limited to, the following implementations:

[0113] 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.

[0114] In the first mode, as shown in FIG. 1, the light recycling assembly comprises a first polarization conversion element 32 and a polarization separation element 33. The first polarized excitation light emitted by the first light source assembly passes through the polarization separation element and the first polarization conversion element when entering the wavelength conversion device. The residual excitation light passes through the first polarization conversion element and then the polarization separation element after entering the light recycling assembly. The polarization state of the residual excitation light passing through the first polarization conversion element twice is converted to the second polarization state. The second polarized residual excitation light is reflected by the polarization separation element and then enters the first polarization conversion element. The residual excitation light passes through the first polarization conversion element and the light splitting and combining element and then re-enters the wavelength conversion device for re-excitation. For example, the first polarization conversion element can be a 1 / 4 wave plate, the polarization separation element can be a wire grid or a PBS or a 0-degree polarizing plate that transmits P-state light and reflects S-state light, and the polarizing plate transmits P-state blue light and reflects S-state blue light.

[0115] In the second mode, as shown in FIG. 5, the light recycling assembly comprises a first polarization conversion element 32, a first light splitting element 331 and a second reflecting element 332. The first polarized excitation light emitted by the first light source assembly passes through the first light splitting element and the first polarization conversion element when entering the wavelength conversion device. The residual excitation light passes through the first polarization conversion element and then the first light splitting element after entering the light recycling assembly. The polarization state of the residual excitation light passing through the first polarization conversion element twice is converted to the second polarization state. The second polarized residual excitation light is reflected by the first light splitting element and then enters the second reflecting element. The residual excitation light is reflected by the second reflecting element back to the first light splitting element, and then re-enters the first polarization conversion element after being reflected by the first light splitting element. The residual excitation light passes through the first polarization conversion element and the light splitting and combining element and then re-enters the wavelength conversion device for re-excitation. For example, the second reflecting element can be a mirror, a substrate coated with a reflective film or a reflective diffuser. The first light splitting element can transmit P-state blue light and reflect S-state blue light.

[0116] Optionally, 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 elements in the light recycling assembly are arranged on at least two sides of the light splitting and combining element. The polarization state of the excitation light emitted by the first light source assembly is the first polarization state. The light splitting and combining element transmits the first polarized excitation light and reflects the second polarized excitation light.

[0117] In the third mode, the light recycling assembly comprises the first polarization conversion element 32 and the second light splitting element 40; the first polarized excitation light emitted by the first light source assembly passes through the first polarization conversion element when entering the wavelength conversion device; the residual excitation light passes through the shaping lens group and enters the first polarization conversion element, the polarization state of the residual excitation light passing through the first polarization conversion element twice is converted into the second polarization state, the second polarized residual excitation light enters the light splitting and combining element, is reflected by the light splitting and combining element, enters the second light splitting element, is reflected by the second light splitting element back to the light splitting and combining element, passes through the light splitting and combining element and the first polarization conversion element, and can enter the wavelength conversion device again for re-excitation. The second light splitting element can transmit the first polarized light and reflect the second polarized light, or the second light splitting element can reflect the light with the target wavelength as the main wavelength, and the excitation light emitted by the first light source assembly has the target wavelength as the main wavelength. For example, as shown in FIG. 6, the first polarization conversion element 32 and the second light splitting element 40 are distributed on both sides of the light splitting and combining element 12. The light splitting and combining element and the second light splitting element 40 can transmit the P-state blue light and reflect the S-state blue light, and can also transmit the red laser, the green laser and the excited light. Alternatively, the light splitting and combining element can transmit the P-state blue light and reflect the S-state blue light, and the second light splitting element 40 can transmit the blue laser with a wavelength of 465 nm and reflect the blue laser with a wavelength of 455 nm.

[0118] In the fourth mode, the light recycling assembly comprises the first polarization conversion element, the third light splitting element and the second reflecting element; the first polarized excitation light emitted by the first light source assembly passes through the first polarization conversion element when entering the wavelength conversion device; the residual excitation light passes through the shaping lens group and enters the first polarization conversion element, the polarization state of the residual excitation light passing through the first polarization conversion element twice is converted into the second polarization state, the second polarized residual excitation light enters the light splitting and combining element, is reflected by the light splitting and combining element, enters the third light splitting element, is reflected by the third light splitting element, enters the second reflecting element, is reflected by the second reflecting element back to the third light splitting element, is reflected by the third light splitting element again, enters the light splitting and combining element, and passes through the light splitting and combining element and the first polarization conversion element to enter the wavelength conversion device again for re-excitation. For example, as shown in FIG. 7, the first polarization conversion element 32, the third light splitting element 41 and the second reflecting element 42 are distributed on both sides of the light splitting and combining element 12; the light splitting and combining element and the third light splitting element 41 can transmit the P-state blue light and reflect the S-state blue light.

[0119] Optionally, if the optical axis of the excitation light emitted by the first light source assembly deviates from the optical axis of the shaping lens group, the light recycling assembly comprises the first reflecting element.

[0120] In the fifth mode, the residual excitation light is injected into the first reflecting element through the light splitting and combining element, the first reflecting 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. As shown in FIG. 8, the first reflecting element 37 can be a small mirror.

[0121] Optionally, the optical axis of the first reflecting element is symmetrical 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; the first reflecting element can reflect as much residual excitation light as possible back to the light splitting and combining element, thereby improving the re-excitation efficiency, and the luminous flux gain of the excited light emitted by the light source system can be increased by 6% to 13%.

[0122] Optionally, the long side of the first reflecting 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 reflecting element is greater than or equal to the short axis of the spot of the residual excitation light. Controlling the size of the first reflecting element can reflect as much residual excitation light as possible while reducing the volume of the light source system.

[0123] In the schemes shown in modes one to four, the light recycling assembly includes a target light splitting element 31, the target light splitting element 31 in schemes one and two transmits the excitation light emitted by the first light source and reflects the target excited light, or the target light splitting element 31 in schemes three, four and five transmits the excitation light emitted by the first light source and reflects the target excited light; the light recycling assembly can simultaneously realize 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 light source system.

[0124] 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 reflecting element, the target reflecting element includes a target area that reflects the residual excitation light, and other areas of the target reflecting element transmit the excitation light emitted by the first light source assembly and reflect the target excited light and the residual excitation light; the target area can be a total reflection area, such as a mirror. The excitation light emitted by the first light source assembly is transmitted through the other areas of the target reflecting element; after the residual excitation light and the target excited light are injected into the third light splitting element through the light splitting and combining element, the target excited light is reflected back to the light splitting and combining element through the target reflecting element, and the residual excitation light is reflected back to the light splitting and combining element through the target area of the target reflecting element. For example, as shown in FIG. 9, the upper part of the target reflecting element 38 transmits the excitation light emitted by the first light source assembly and reflects the target excited light, and the lower half area (target area) reflects the residual excitation light. This mode uses fewer devices while ensuring high excitation efficiency and light combining efficiency.

[0125] In the seventh mode, 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 third light splitting element, which includes a light splitting region. Optionally, the light splitting region can be a through hole or a substrate coated with an antireflection film or a dichroic lens. 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 other regions reflect the residual excitation light and the target stimulated light; or, when the light splitting region is a through hole or a substrate coated with an antireflection film, the light splitting region transmits the excitation light emitted by the first light source assembly, and other regions reflect the residual excitation light and the target stimulated light.

[0126] 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 are incident on the third light splitting element through the light splitting and combining element, the target stimulated light is reflected back to the light splitting and combining element through the third light splitting element, and the residual excitation light is reflected back to the light splitting and combining element through other regions of the third light splitting element. As shown in FIG. 10, the light recycling assembly includes a third light splitting element 39, the middle region (light splitting region) of the third light splitting element transmits the excitation light emitted by the first light source assembly and the residual blue light, and other regions (which can be total reflection regions) reflect the residual excitation light and the target stimulated light. This mode uses fewer devices while ensuring high excitation efficiency and light combining efficiency.

[0127] In some embodiments, the wavelength conversion device further includes a transmission region, and the light source system further includes a reflection guiding assembly for guiding the excitation light transmitted by the transmission region to the homogenizing element as the excitation light emitted by the light source system; that is, the excitation light as the emitted light passes through the wavelength conversion device and has a different optical path from the residual excitation light, which can fully utilize the residual excitation light for re-excitation light and utilize the excitation light as emitted light, thereby improving the brightness of the projection device. For example, as shown in FIG. 11, the reflection guiding assembly can include reflection elements 43 and 44, the element 21 can transmit the excitation light generated by the first light source assembly, and the reflection elements 43 and 44 can reflect the primary color light and the stimulated light generated by the second light source assembly, such as transmitting blue laser with a main wavelength of 455 nm and reflecting blue laser with a main wavelength of 466 nm, red laser, green laser, and yellow fluorescence.

[0128] In summary, the light source system provided by the 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 light source 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 light source system, so that the light can be recycled, thereby improving the light combining efficiency and the brightness of the projection 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. 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 fluorescence excitation efficiency and the light efficiency of the projection device.

[0129] FIG. 12 is a functional module diagram of a projection device provided by the application. As shown in FIG. 12, the projection device includes an image processor 101 and a projection light machine 102. Wherein:

[0130] 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 process unit (NPU), etc. The image processor 101 can be used for video decoding, image quality processing, etc.

[0131] The projection light machine 102 can include a driving chip, a spatial light modulator, and the light source 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 projection light machine 102 is used to project the image to be projected into a projection picture.

[0132] In some embodiments, the projection device further comprises a central controller 103 with 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 projection device, and is connected to various parts of the projection 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.

[0133] In some embodiments, the projection device further comprises a memory 104 with one or more computer-readable storage media, an input module 105, a communication module 106, a power supply 107, and the like. Those skilled in the art can understand that the structure of the projection device shown in FIG. 12 does not constitute a limitation on the projection device, and can include more or fewer components than shown, or combine certain components, or different component arrangements. Among them:

[0134] 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 operating systems, application programs required by at least one 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 projection device, and the like. 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.

[0135] The projection device can further comprise 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.

[0136] The projection device can further comprise a communication module 106, which in some embodiments can include a wireless module. The projection 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.

[0137] The projection device also includes a power supply 107 to power the various components. In some embodiments, the power supply 107 can be logically connected to the central controller 103 through a power management system, such that the power management system can manage charging, discharging, and power consumption management, among other functions. The power supply 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.

[0138] 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 "a" and "the" and "said" herein is intended to include the plural forms of the identified elements, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0139] 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 light source system, characterized by, The light source system comprises 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 can emit excitation light, the second light source component can emit at least one primary color light, the light recycling component is arranged between the first light source component and the light splitting and combining element, or the elements in the light recycling component are arranged on at least two sides of the light splitting and combining element, wherein: The primary color light emitted by the second light source component is injected into the light homogenizing element after passing through the light splitting and combining element, and is emitted after homogenization by the light homogenizing element; The excitation light emitted by the first light source component is injected into 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 component is injected into the wavelength conversion device; when the wavelength conversion device is excited by the injected excitation light, the light emitted from the wavelength conversion device includes stimulated light and residual excitation light, and the stimulated light and the residual excitation light are both injected to the shaping lens group; The stimulated light is injected into the light splitting and combining element after passing through the shaping lens group, and is injected into the light homogenizing element after passing through the light splitting and combining element, and is emitted after homogenization by the light homogenizing element; The residual excitation light is injected into the light splitting and combining element and the light recycling component after being shaped by the shaping lens group, and can be re-injected into the wavelength conversion device for re-excitation after passing through the light recycling component and the light splitting and combining element.

2. The light source system of claim 1, wherein If the optical axis of the excitation light emitted by the first light source component coincides with the optical axis of the shaping lens group, the light recycling component is arranged between the first light source component and the light splitting and combining element; The light recycling component comprises a first polarization conversion element and a polarization separation element, and the polarization state of the excitation light emitted by the first light source component is a first polarization state; the excitation light of the first polarization state emitted by the first light source component passes through the polarization separation element and the first polarization conversion element when being injected into the wavelength conversion device; after the residual excitation light is injected into the light recycling component through the light splitting and combining element, it is first injected into the polarization separation element through the first polarization conversion element, the polarization state of the residual excitation light 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 injected into the first polarization conversion element, and can be re-injected into the wavelength conversion device for re-excitation after passing through the first polarization conversion element and the light splitting and combining element; Or, the light recycling assembly comprises a first polarization conversion element, a first light splitting element and a second reflecting element, the polarization state of the excitation light emitted by the first light source assembly is a first polarization state; the residual excitation light, after being incident on the light recycling assembly through the light splitting and combining element, is first incident on the first polarization conversion element and then on the first light splitting element, the polarization state of the residual excitation light twice through the first polarization conversion element is converted into a second polarization state, the residual excitation light of the second polarization state is reflected by the first light splitting element and then is incident on the second reflecting element, is reflected by the second reflecting element back to the first light splitting element, is reflected by the first light splitting element again and then is incident on the first polarization conversion element, and after passing through the first polarization conversion element and the light splitting and combining element, can be incident on the wavelength conversion device again for re-excitation.

3. The light source system of claim 1, wherein 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 comprises a first reflecting element; The residual excitation light, after being incident on the light splitting and combining element, is incident on the first reflecting element, the first reflecting element reflects the residual blue light back to the light splitting and combining element, and then the residual blue light is incident on the wavelength conversion device again for re-excitation.

4. The light source system of claim 3, wherein The optical axis of the first reflecting element is symmetrical to the optical axis of the excitation light emitted by the first light source assembly with respect to the optical axis of the shaping lens group; And / or, the long side of the first reflecting 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 reflecting element is greater than or equal to the short axis of the spot of the residual excitation light.

5. The light source system of claim 1, wherein The elements in the light recycling assembly are arranged on at least two sides of the light splitting and combining element; the polarization state of the excitation light emitted by 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 a second polarization state; The light recycling assembly comprises a first polarization conversion element and a second light splitting element; the excitation light of the first polarization state emitted by the first light source assembly passes through the first polarization conversion element when being incident on the wavelength conversion device; The residual excitation light, after being incident on the shaping lens group, is incident on the first polarization conversion element, the polarization state of the residual excitation light twice through the first polarization conversion element is converted into a second polarization state, the residual excitation light of the second polarization state is incident on the light splitting and combining element, is reflected by the light splitting and combining element and then is incident on the second light splitting element, is reflected by the second light splitting element back to the light splitting and combining element, and after passing through the light splitting and combining element and the first polarization conversion element, can be incident on the wavelength conversion device again for re-excitation; wherein the second light splitting element can transmit light of a first polarization state and reflect light of a second polarization state, or the second light splitting element can reflect light whose main wavelength is a target wavelength, and the main wavelength of the excitation light emitted by the first light source assembly is the target wavelength; Or, the light recycling assembly comprises a first polarization conversion element, a third light splitting element and a second reflecting element, the excitation light of the first polarization state emitted by the first light source assembly passes through the first polarization conversion element when being incident on the wavelength conversion device; The residual excitation light is injected into the first polarization conversion element through the shaping lens group, the polarization state of the residual excitation light is converted into a second polarization state twice through the first polarization conversion element, the residual excitation light of the second polarization state is injected into the light splitting and combining element, is reflected through the light splitting and combining element, is injected into the third light splitting element, is reflected through the third light splitting element, is injected into the second reflecting element, is reflected back to the third light splitting element through the second reflecting element, is reflected again through the third light splitting element, is injected into the light splitting and combining element, and is injected again into the wavelength conversion device through the light splitting and combining element and the first polarization conversion element for re-excitation.

6. The light source system of claim 1, wherein, When the excited light is injected into the light splitting and combining element, target excited light is injected into the light recycling assembly, the target excited light is light of the first polarization state and in a waveband coinciding with a waveband of primary color light emitted by the second light source assembly among the excited light; The light recycling assembly reflects the target excited light back to the light splitting and combining element, and the target excited light is injected into the wavelength conversion device through the light splitting and combining element and the shaping lens group; First excited light and 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 is injected into the light homogenizing element through the shaping lens group and the light splitting and combining element for light homogenization; The second excited light is transmitted through the light splitting and combining element, and is injected into the light recycling assembly, and the cycle is repeated.

7. The light source system of claim 6, wherein The light recycling assembly comprises a target light splitting element; The target light splitting element transmits excitation light emitted by the first light source and reflects the target excited light; Or, the target light splitting element transmits excitation light and residual excitation light emitted by the first light source and reflects the target excited light.

8. The light source system according to claim 6, wherein 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 comprises a target reflecting element, the target reflecting element comprises a target area, the target area reflects residual excitation light, and other areas of the target reflecting element transmit excitation light emitted by the first light source and reflect the target excited light; 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 light recycling assembly comprises a fourth light splitting element, the fourth light splitting element comprises a light splitting area, the light splitting area is a through hole, a substrate coated with an anti-reflection film, or a dichroic lens; the light splitting area transmits excitation light emitted by the first light source, reflects the target excited light, and reflects residual excitation light and the target excited light in other areas of the target reflecting element, or the light splitting area transmits excitation light emitted by the first light source, reflects residual excitation light and the target excited light, and reflects the target excited light in other areas of the target reflecting element.

9. The light source system of claim 6, wherein, The light-splitting and light-combining element can transmit blue light of a first waveband, green light of a first polarization state of a second waveband, red light of a third waveband or red light of a first polarization state of the third waveband, and reflect green light of a second polarization state of the second waveband and / or red light of a second polarization state of the third waveband and light of a remaining waveband; Then, the light of the first polarization state of the second waveband in the excitation light and the excited light and / or the light of the first polarization state of the third waveband in the excited light is transmitted by the light-splitting and light-combining element; the light of the second polarization state of the second waveband in the excited light and / or the light of the second polarization state of the third waveband in the excited light and the light of the remaining waveband is reflected by the light-splitting and light-combining element; and the target excited light includes the light of the first polarization state of the second waveband and / or the light of the first polarization state of the third waveband in the excited light.

10. The light source system according to claim 1 or 9, characterized in that, The primary color light emitted by the second light source assembly is green laser light of a first polarization state, red laser light and blue laser light, and the light-splitting and light-combining element transmits the green laser light of the first polarization state, the red laser light and the blue laser light; And / or, 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.

11. The light source system of claim 1, wherein, The second light source assembly emits red laser light, and the second light source assembly includes a first laser light source and a second laser light source which are independent of each other, and a light guide assembly, and the first laser light source and the second laser light source are oppositely arranged; 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 which 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; And / or, the first laser light source and the second laser light source also emit blue laser light and green laser light, and 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 green laser light and the light-emitting side of the light source assembly.

12. The light source system of claim 11, wherein, The second light source assembly further includes a third laser light source, 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.

13. The light source system of claim 1, wherein, The first light source assembly and the second light source assembly are arranged side by side on one side of the light-splitting and light-combining element.

14. The light source system of claim 1, wherein, The light-emitting side of the first light source assembly is provided with a first speckle suppression element, and / or the light-emitting side of the second light source assembly is provided with a second speckle suppression element.

15. The light source system of claim 1, wherein, The second light source assembly includes a first compound eye, and the light homogenizing element is a second compound eye; The angle of incidence of the light emitted by the second light source assembly into the first compound eye is greater than the angle of incidence of the light into the second compound eye; And / or, the angle of incidence of the light into the second compound eye is less than a preset angle threshold.

16. The light source system of claim 1, wherein, The wavelength conversion device includes at least one conversion region, each conversion region corresponds to one excited light, and each conversion region is provided with a filter element on the light-emitting side to filter the corresponding excited light. And / or, the wavelength conversion device further comprises a transmission region, the light source system further comprises a reflection guiding assembly, the reflection guiding assembly is used for guiding the excitation light transmitted by the transmission region to the light homogenizing element.

17. The light source system of claim 16, wherein, The conversion region in the wavelength conversion device is provided with phosphor powder, and the proportion of the corresponding phosphor powder in each conversion region is within a preset proportion range and the thickness is within a preset thickness range.

18. The light source system of claim 1, wherein, The wavelength conversion device and the light splitting and combining element are provided with a color filter element and a driving device, the driving device drives the color filter element to be located in the light path of the excitation light to filter the excitation light under the first preset condition, and the driving device drives the color filter element to not be located in the light path of the excitation light under the second preset condition. Alternatively, the wavelength conversion device and the light splitting and combining element are provided with a color filter element, and the color filter element filters the excitation light.

19. The light source system of claim 1, wherein, The second light source assembly comprises a first laser light source and a second laser light source, and when the first laser light source and / or the second laser light source comprises four red laser light emitting chips, three green laser light emitting chips and two 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.

20. The light source system according to claim 1, wherein, The first light source assembly comprises an excitation light source and / or a target light source, and the excitation light emitted by the excitation light source and / or the light emitted by the target light source is used as excitation light to excite the wavelength conversion device.

21. A projection apparatus, characterized by, The light source system according to any one of claims 1-20.

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