CN117130219A

CN117130219A - Light source system and projection apparatus

Info

Publication number: CN117130219A
Application number: CN202311069287.9A
Authority: CN
Inventors: 刘金根; 陈龙
Original assignee: Wuxi Jiqing Optoelectronic Technology Co ltd
Current assignee: Wuxi Jiqing Optoelectronic Technology Co ltd
Priority date: 2023-08-23
Filing date: 2023-08-23
Publication date: 2023-11-28

Abstract

The application provides a light source system and a projection device, wherein the light source system comprises: an excitation light source for emitting excitation light; the wavelength conversion device is used for performing wavelength conversion on the received excitation light to generate a lasing light; the light supplementing light source is used for emitting supplementing light; a first light combining element for guiding the excitation light to the wavelength conversion device, guiding the excited light for combining light, or guiding the excited light to the wavelength conversion device, guiding the excited light and the complementary light for combining light; the second light combination element is arranged adjacent to the first light combination element and is used for adjusting the incident angle of the complementary color light emitted by the complementary light source entering the light homogenizing device of the projection equipment, and the first light path conversion component is arranged between the light outlet of the light source system and the light homogenizing device of the projection equipment.

Description

Light source system and projection apparatus

Technical Field

The present application relates to the field of projection display technology, and more particularly, to a light source system and a projection apparatus.

Background

In an imaging light source displayed by a projector, three-color laser light provides a display device with a color gamut width and color accuracy representation that are difficult to match. Meanwhile, the high-efficiency electro-optic conversion of the laser is also an ideal light source technology of 'lower carbon'. However, in addition to these natural advantages, trichromatic lasers also have a great problem: that is "speckle" +.! In order to avoid 'speckle', a mixed light source, such as an LED mixed three-color laser light source, a laser fluorescence mixed three-color laser light source and other light source routes, should be used. Because of the large difference among the LED light source light spreading, the laser fluorescence light spreading and the three-color laser light spreading, the optical imaging system after light combination of the LED light source light spreading and the laser fluorescence light spreading often causes the problem of uniformity of pictures.

Light sources with different optical expansion amounts are combined on the same light splitting and combining element, then enter a light homogenizing device of an optical mechanical system after passing through the relevant optical element, the light homogenizing device generally adopts a light homogenizing rod or a compound eye system, and in order to improve the light homogenizing effect on light supplementing light, the current common mode is to lengthen the light homogenizing rod in the optical mechanical system or adopt the compound eye system to achieve the light homogenizing effect, but the projector body volume is increased, the cost is increased, and the efficiency of laser is reduced due to the fact that the number of times of laser reflection is more; in addition, as the light-emitting etendue of the three-color laser is smaller than that of the light-combining light source, a compound eye system is adopted, the three-color laser beam needs to be expanded, the optical cost can be increased, and the light-combining efficiency after the expansion can be influenced; in addition, the light-emitting angle and the light beam caliber of the light-supplementing light source are small, so that the number of reflection times after the light-supplementing light source enters the light-homogenizing rod after light combination is less than the number of reflection times of laser, and the uniform light is insufficient and the uniformity of brightness and color of a picture is poor.

In view of the above, the present application provides a new light source system and projection device to at least partially solve the above problems.

Disclosure of Invention

The present application has been made in view of the above-described problems. The application provides a light source system and a projection apparatus, which are arranged in the light source system.

According to an aspect of the present application, there is provided a light source system including:

an excitation light source for emitting excitation light;

the wavelength conversion device is used for performing wavelength conversion on the received excitation light to generate a lasing light;

the light supplementing light source is used for emitting supplementing light;

a first light combining element for guiding the excitation light to the wavelength conversion device, guiding the excited light for combining light, or guiding the excited light to the wavelength conversion device, guiding the excited light and the complementary light for combining light;

the second light combination element is arranged adjacent to the first light combination element and is used for adjusting the incident angle of the complementary color light emitted by the complementary light source entering the light homogenizing device of the projection equipment, and the first light path conversion component is arranged between the light outlet of the light source system and the light homogenizing device of the projection equipment.

In some embodiments, the second light combining element has a predetermined angle with the first light combining element, wherein the predetermined angle is not greater than 45 °.

In some embodiments, the central axis of the second light combining element is different from the central axis of the first light combining element, wherein the central axis of the second light combining element is perpendicular to the light incident surface of the second light combining element, and the central axis of the first light combining element is perpendicular to the light incident surface of the first light combining element.

In some embodiments, the second light combining element is configured to reflect the complementary color light emitted by the light compensating light source to the light emitting lens.

In some embodiments, the second light combining element is parallel to or integral with the first light combining element.

In some embodiments, the light source further comprises a support and a housing, the support is disposed in the housing, the second light combining element is mounted on the support, and the support is rotatably connected with the housing through a rotating shaft.

In some embodiments, the light source further comprises a locking member, wherein the locking member is connected with the bracket and the shell and is used for keeping the first light combining element and the second light combining element at a preset included angle.

In some embodiments, the light beam incident on the first light combining element has a larger spot area on the first light combining element than the light beam incident on the second light combining element.

In some embodiments, the complementary color light has an etendue that is less than the etendue of the lasing light.

In some embodiments, the wavelength conversion device comprises a substrate and a driving module, wherein the substrate of the wavelength conversion device is provided with a wavelength conversion part and a light transmission area, and the light transmission area is used for transmitting excitation light incident on the wavelength conversion device.

In some embodiments, a second light path conversion component is further included for guiding the excitation light transmitted from the wavelength conversion device to be incident again on the first light combining element.

In some embodiments, the light source system further includes a beam shrinking lens, the second light path conversion component includes a first light path conversion element, a collimating lens, a second light path conversion element, and a beam splitting element, the beam shrinking lens is disposed between the wavelength conversion device and the first light path conversion element, the excitation light transmitted from the wavelength conversion device is condensed by the beam shrinking lens and then enters the first light path conversion element, the first light path conversion element guides the excitation light to the collimating lens, the excitation light collimated by the collimating lens enters the second light path conversion element, the second light path conversion element guides the excitation light to the beam splitting element, and the beam splitting element guides the excitation light to the first light combining element and/or the second light combining element.

In some embodiments, the first light path conversion element is a mirror and the second light path conversion element is a mirror.

In some embodiments, the first light path conversion component includes a first mirror and a second mirror, where the first mirror and the second mirror are disposed between a light outlet of the light source system and a light homogenizing device of the projection apparatus, the first mirror is configured to reflect the laser light to the light homogenizing device, and the second mirror is configured to reflect the complementary color light to the light homogenizing device, or the second mirror is configured to reflect the laser light and the complementary color light to the light homogenizing device.

In some embodiments, the first mirror and the second mirror are disposed side by side on the same plane, or an included angle is formed between the first mirror and the second mirror.

In some embodiments, the first mirror is configured to be adjustable in its tilt angle and the second mirror is configured to be adjustable in its tilt angle.

In some embodiments, the light source further comprises a housing, a first support and a second support, wherein an accommodating space is formed in the housing, the first light combining element and the second light combining element are arranged in the housing, the housing is provided with a light outlet, the first reflector is arranged on the first support, the second reflector is arranged on the second support, the first reflector is rotatably connected with the housing through the first support, and the second reflector is rotatably connected with the housing through the second support;

The first support is provided with a first adjusting mechanism, the first adjusting mechanism is used for adjusting the inclination angle of the first reflecting mirror, the second support is provided with a second adjusting mechanism, and the second adjusting mechanism is used for adjusting the inclination angle of the second reflecting mirror.

In some embodiments, the first mirror is scanned by the light beam over an area that is greater than the area of the second mirror scanned by the light beam.

In some embodiments, the first light path conversion assembly includes a refractive element configured to enlarge an angle at which the complementary color light and the stimulated luminescence passing therethrough enter the dodging device.

In some embodiments, the wavelength of the supplemental light is different from the wavelength of the excitation light.

According to a second aspect of the present application, there is provided a projection apparatus comprising the aforementioned light source system, light homogenizing device and light machine;

the light homogenizing device is used for carrying out spot shaping on the light beam emitted by the light source system to obtain an illumination light beam;

the optical machine is used for converting the illumination light beam into an image light beam.

The light source system of the embodiment of the application is provided with the second light combination element and/or the first light path conversion component, the second light combination element is arranged adjacent to the first light combination element and is used for adjusting the incidence angle of the complementary color light emitted by the complementary light source entering the light homogenizing device of the projection equipment, the first light path conversion component is arranged between the light outlet of the light source system and the light homogenizing device of the projection equipment and is used for adjusting the incidence angle of the complementary color light entering the light homogenizing device of the projection equipment, and the incidence angle of the complementary color light entering the light homogenizing device of the projection equipment is adjusted through the second light combination element and/or the first light path conversion component, so that the reflection times of the complementary color light entering the light homogenizing device of a light homogenizing rod after the complementary color light combination can be increased, the light homogenizing effect can be improved, and the brightness and color uniformity of an output picture when the projection equipment is applied are better. In addition, by adjusting the incidence angle, a light homogenizing rod in an optical machine system is not required to be lengthened or a compound eye system is adopted, a better light homogenizing effect can be achieved, the size of projection equipment is reduced, the cost is reduced, the reflection times of laser receiving can not be increased, and therefore the efficiency of laser receiving is improved; in addition, even if the compound eye system is adopted as a light homogenizing device, the three-color laser beam does not need to be expanded due to adjustment of the incident angle, so that the optical cost is correspondingly reduced, and the light combining efficiency is not influenced.

Drawings

The above and other objects, features and advantages of the present application will become more apparent from the following more particular description of embodiments of the present application, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.

FIG. 1 is a schematic block diagram of a light source system according to an embodiment of the present application;

FIG. 2 is a schematic block diagram of a light source system according to another embodiment of the present application;

FIG. 3 is a partial schematic perspective view of the light source system of FIG. 2;

FIG. 4 is another schematic diagram of the light source system of FIG. 2;

FIG. 5 is another partial schematic perspective view of the light source system of FIG. 2;

FIG. 6 is a schematic diagram of a bracket of a second light combining element according to an embodiment of the application;

FIG. 7 is a schematic view illustrating a position of a bracket of a second light combining element in a housing of a light source system according to an embodiment of the present application;

FIG. 8 is a schematic view of a light source system according to another embodiment of the present application;

FIG. 9A is a schematic diagram of a light source system according to yet another embodiment of the present application;

FIG. 9B is a schematic diagram of a light source system according to yet another embodiment of the present application;

fig. 10 is a schematic structural view of a projection apparatus according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and it should be understood that the present application is not limited by the example embodiments described herein. Based on the embodiments of the application described in the present application, all other embodiments that a person skilled in the art would have without inventive effort shall fall within the scope of the application.

In order to solve the problems of complex structure and low light efficiency of the existing light source system, an embodiment of the application provides a light source system. Fig. 1 is a schematic block diagram of a light source system according to an embodiment of the present application, as shown in fig. 1, the system including:

an excitation light source 101 for emitting excitation light;

the wavelength conversion device 104 is configured to perform wavelength conversion on the received excitation light to generate a lasing light;

A light supplementing light source 105 for emitting supplementing light;

a first light combining element 111 for guiding the excitation light to the wavelength conversion device 104, and guiding the excited light for combining light;

and a second light combining element 112, where the second light combining element 112 is disposed adjacent to the first light combining element 111, and is used to adjust an incident angle of the complementary color light emitted by the light complementary source 105 entering the light homogenizing device of the projection apparatus.

The light source system of the application comprises the second light combining element 112, and the incidence angle of the complementary color light entering the light homogenizing device of the projection equipment is adjusted through the second light combining element 112, so that the reflection times of the complementary color light entering the light homogenizing device such as a light homogenizing rod after the complementary color light is synthesized can be increased, the light homogenizing effect can be improved, and the brightness and color uniformity of the picture output when the projection equipment is applied is better. In addition, by adjusting the incidence angle, a light homogenizing rod in an optical machine system is not required to be lengthened or a compound eye system is adopted, a better light homogenizing effect can be achieved, the size of projection equipment is reduced, the cost is reduced, the reflection times of laser receiving can not be increased, and therefore the efficiency of laser receiving is improved; in addition, even if the compound eye system is adopted as a light homogenizing device, the three-color laser beam does not need to be expanded due to adjustment of the incident angle, so that the optical cost is correspondingly reduced, and the light combining efficiency is not influenced.

Next, a light source system according to an embodiment of the present application will be described with reference to fig. 1 to 7.

The light source system of the present application includes an excitation light source 101 and a light-supplementing light source 105. Alternatively, the light source may be a laser light source for emitting a laser beam as excitation light. The light beam emitted by the excitation light source 101 may be blue light, red light, violet light, ultraviolet light, or the like, but is not limited thereto. The excitation light source 101 is, for example, a laser light emitting device, and laser light having a single polarization characteristic is emitted by a specific laser light source device. In order to ensure the light emitting effect of the light source, the light path of the integrated light can be properly adjusted according to the different quantity and polarization characteristics of the used laser light sources. In one example, the excitation light may be blue light, for example, blue light having a wavelength between 440-470 nm. Alternatively, the blue light may also be used as one of the three primary colors in the composite white light. The peak wavelength of the excitation light may be 455+/-3nm, for example. The light-compensating light source 105 is a light source capable of emitting light with three primary colors, such as light with three colors of red, green and blue, and in some embodiments, the light-compensating light source 105 may also be a light source capable of emitting light with the colors of red, green and blue Huang Sizhong, and when in use, multiple colors of laser light can be emitted according to the requirement of the projection system at the same time or time. The light supplementing light source 105 may be a vertical-cavity surface-emitting laser (VCSEL), for example.

When the whole light source system comprises blue laser and a light supplementing light source 105, such as a trichromatic laser light source (for example, red, green and blue laser light), the blue laser light is used for exciting the wavelength conversion material of the wavelength conversion device 104 into laser light, and the laser light is used for directly emitting the laser light onto a screen by a projector, if the laser light is only subjected to laser light, the color is not right, the color of the pure trichromatic laser light is good, but the coherence, the narrowband property and the radiation property are good, and the speckle is serious. The characteristics of speckle dissipation and partial coherence can be achieved by superposing the wide wave characteristics of the laser light and the narrow band characteristics of the pure laser light.

The light source system of the present application further includes a first light combining element 111, where the first light combining element 111 is configured to combine the light beams incident on the first light combining element 111 after the light beams are transmitted or reflected by the first light combining element 111. It will be understood that the incident light beam includes the excitation light source 101, and further includes the lasing light subjected to wavelength conversion by the wavelength conversion device, and the excitation light emitted from the excitation light source 101 for light combination, and so on.

Specifically, the first light combining element 111 may be a polarizing beam splitter, which may be a prism or a plane mirror, where at least a part of the area of the plane mirror is provided with an optical film layer, but is not limited thereto. Optionally, the light incident surface of the first light combining element 111 is inclined with respect to the optical axis of the excitation light emitted by the excitation light source 101, for example, by an angle between 30 ° and 65 °, for example, 45 °, or by any other suitable angle, for example, 50 °, 60 °, etc.

The light source system of the present application further includes a wavelength conversion device 104, and the wavelength conversion device 104 is configured to wavelength-convert the excitation light incident on the wavelength conversion device 104, generate a laser beam, and reflect the laser beam to the lens group 103. Wherein the wavelength of the laser light is larger than the wavelength of the excitation light.

Specifically, the excitation light may be converted into a lasing light having a wavelength larger than that of the excitation light by wavelength conversion, and, for example, when the excitation light is blue light, the lasing light may be yellow light, red light, green light, or the like.

Illustratively, the wavelength conversion device 104 includes a drive module and a substrate. The system may also include a spot shaping assembly for matching the shape of the digital light valve in the back-end optical system.

A wavelength conversion part and a light transmission area are arranged on the substrate, and the light transmission area is used for transmitting excitation light incident on the wavelength conversion device 104; the wavelength conversion unit wavelength-converts the incident excitation light to obtain a laser beam, and the laser beam and the reflected laser beam are emitted toward the lens group 103. The driving module is in transmission connection with the substrate so that the wavelength conversion part and the light transmission area are alternately exposed in the incident light beam. The light-transmitting area may have a light-transmitting plate, and the light-transmitting area may also be a notch provided on the substrate.

Specifically, the wavelength conversion portion is made of a wavelength conversion material, and when the wavelength conversion device 104 rotates at a high speed, the wavelength conversion material and the light transmitting region are exposed to excitation light at a high speed timing.

The driving module may be a motor or other modules with driving functions, and the specific implementation of the driving module is not specifically limited in this embodiment.

The wavelength conversion materials in this embodiment include, but are not limited to, one or more of red light conversion materials, green light conversion materials, blue light conversion materials, and yellow light conversion materials, and when multiple wavelength conversion materials are included, the wavelength conversion materials for generating light of different colors are arranged in a ring at the peripheral edge region of the substrate. When the wavelength conversion device 104 rotates at high speed, the multiple wavelength conversion materials are exposed to the excitation light spot at high speed timing (i.e., the scanning wavelength conversion material with stable excitation light spot timing). The excitation light irradiated to the light-transmitting region is transmitted for light combination.

In some embodiments, the reflection of the lasing may be achieved by a reflective layer arrangement attached to the substrate, or by the substrate. For example, the substrate may be a metal base material made of copper, aluminum, or the like, and the surface of the substrate on the excitation light irradiation side may be subjected to mirror finishing by silver vapor deposition or the like so that the laser light is reflected out of the wavelength conversion device 104. In some embodiments, the wavelength conversion material is formed on a surface of the mirror-finished substrate.

The wavelength conversion device 104 may also be a transmissive wavelength conversion device 104, where the wavelength conversion device 104 may not be provided with a reflective portion, and the wavelength conversion device 104 may include a substrate and a driving module, where the substrate of the wavelength conversion device 104 is provided with a wavelength conversion portion, and the substrate of the wavelength conversion device may be a light-transmitting substrate, and the wavelength conversion portion is made of a wavelength conversion material, and the generated laser light is transmitted through the wavelength conversion device 104, where, by way of example, the driving module may be a motor or other modules with a driving function, and the specific implementation manner of the driving module is not limited in this embodiment.

In some embodiments, the light source system further includes a lens group 103, as shown in fig. 1 to 7, the lens group 103 is located between the excitation light source 101 and the wavelength conversion device 104, the excitation light emitted by the excitation light source 101 exits through the transmission group 103 and then enters the wavelength conversion device 104, and the laser light generated by the wavelength conversion device 104 is reflected by the wavelength conversion device 104 and then enters the first light combining element 111. Specifically, the lens group 103 may be composed of a first lens and a second lens, where the light incident surface of the first lens is opposite to the light emergent surface of the light combining element, and the light emergent surface of the first lens is opposite to the light incident surface of the second lens. The first lens or the second lens can be a biconvex lens, a plano-convex lens or a concave-convex lens, the light-emitting surface of the first lens is a convex surface, and the light-emitting surface of the second lens is a convex surface.

In some embodiments, the light source system further includes a first beam shrinking element 102, where the first beam shrinking element 102 is disposed between the excitation light source 101 and the first light combining element 111, and the light beam emitted from the excitation light source 101 can be reduced and shaped by the first beam shrinking element 102 and then emitted to the first light combining element, so that the loss of the excited light during light combining is reduced, and the light intensity of the combined light beam is improved. The first beam shrinking element 102 may include one or more lenses, such as convex and/or concave lenses.

In some embodiments, with continued reference to fig. 1-7, to match the shape of the digital light valve in the back-end optical system, the system may further include a spot shaping assembly 107. The spot shaping assembly 107 is disposed between the first beam shrinking element 102 and the first light combining element 111, and in other embodiments, a filter element 108 is disposed behind the spot shaping assembly 107, that is, the filter element is disposed between the spot shaping assembly and the first light combining element 111, and the filter element can filter the excitation light to obtain the excitation light within a predetermined wavelength range.

Further, with continued reference to fig. 1 to fig. 7, the light source system may further include a second light combining element 112, where the second light combining element 112 is disposed adjacent to the first light combining element 111, and is used to adjust an incident angle of the complementary color light emitted by the light compensating light source 105 entering the light homogenizing device of the projection apparatus, that is, adjust an exit angle of the complementary color light exiting from the second light combining element 112, for example, increase an exit angle of the complementary color light exiting from the second light combining element 112, so as to increase a reflection number of the complementary color light after entering the light homogenizing device, for example, a light homogenizing rod, thereby improving a light homogenizing effect and making brightness and color uniformity of an image output when the projection apparatus is applied better. In addition, by adjusting the incidence angle, a light homogenizing rod in an optical machine system is not required to be lengthened or a compound eye system is adopted, a better light homogenizing effect can be achieved, the size of projection equipment is reduced, the cost is reduced, the reflection times of laser receiving can not be increased, and therefore the efficiency of laser receiving is improved; in addition, even if the compound eye system is adopted as a light homogenizing device, the three-color laser beam does not need to be expanded due to adjustment of the incident angle, so that the optical cost is correspondingly reduced, and the light combining efficiency is not influenced.

The second light combining element 112 has a predetermined angle with the first light combining element 111, wherein the predetermined angle is not greater than 45 °, for example between 0 ° and 20 °, or other suitable angle. In some embodiments, the inclination angle of the second light combining element 112 may be adjustable, for example, the second light combining element 112 may include degrees of freedom including at least 2 directions, that is, the inclination angle may be adjusted in at least two directions, so that a predetermined included angle between the second light combining element 112 and the first light combining element 111 may be greater than 0 °, so as to increase an exit angle of the complementary light exiting from the second light combining element 112, so that the number of reflections after the complementary light enters the light homogenizing device, such as a light homogenizing rod, may be increased, so as to improve a light homogenizing effect, and make brightness and color uniformity of a screen output when the projection apparatus is applied better. The angle of the first light combining element 111 is kept unchanged, so that the number of reflections of the laser light is not increased, and the efficiency is not reduced.

In some embodiments, the light source system of the present application further includes a light-emitting lens 106, where the light-emitting lens 106 is configured to converge and emit the laser light emitted from the first light-combining element 111, and converge and emit the complementary color light emitted from the second light-combining element 112, and an absolute value of a difference between a maximum emission angle of the complementary color light passing through the light-emitting lens 106 and a maximum emission angle of the laser light passing through the light-emitting lens 106 is lower than a predetermined angle difference, where the predetermined angle difference is less than or equal to 10 °, and further, where the predetermined angle difference is less than or equal to 5 °, where the predetermined angle difference is smaller, so that the emission angle of the complementary color light passing through the light-emitting lens 106 is as close as possible to the emission angle of the laser light passing through the light-emitting lens 106, thereby increasing the number of reflections of the complementary color light entering into a light-homogenizing device, such as a light-homogenizing rod, and improving the light-homogenizing effect.

In some embodiments, the light exit lens 106 may be disposed at a light exit of the light source system, which may be located within the housing 100 or may also be located outside the housing 100.

In some embodiments, the central axis of the second light combining element 112 is different from the central axis of the first light combining element 111, where the central axis of the second light combining element 112 is perpendicular to the light incident surface of the second light combining element 112, the central axis of the first light combining element 111 is perpendicular to the light incident surface of the first light combining element 111, and the optical axis of the light emitting lens 106 may pass through the center of the second light combining element 112, and by making the central axis of the second light combining element 112 different from the central axis of the first light combining element 111, the optical axis of the light reflected by the second light combining element 112 deviates from the central axis of the light emitting lens 106, for example, the edge area of the light emitting lens 106 is irradiated, so that the exit angle of the complementary color light after passing through the light emitting lens 106 may also be increased, and the number of reflections after entering the light homogenizing device, for example, such as a light homogenizing rod, after the complementary color light is increased, thereby enabling to improve the light homogenizing effect.

In some embodiments, the second light combining element 112 is configured to reflect the complementary color light emitted by the light compensating light source 105 to the light emitting lens 106, or in some embodiments, the second light combining element 112 is configured to transmit the complementary color light emitted by the light compensating light source 105 to the light emitting lens 106.

In some embodiments, as shown in fig. 2, the second light combining element 112 is parallel to the first light combining element 111, for example, the light incident surface of the second light combining element 112 is parallel to the light incident surface of the first light combining element 111, alternatively, the second light combining element 112 may be attached to the surface of the first light combining element 111, or a predetermined interval may also exist between the second light combining element 112 and the first light combining element 111, where the parallel may be that the first light combining element 111 and the second light combining element 112 are generally parallel. In other embodiments, the second light combining element 112 is integral with the first light combining element 111.

The optical system may further include a housing 100, where the housing 100 has a receiving space for receiving a plurality of components included in the light source system, such as the light supplementing light source 105, the lens group 103, the first light combining element 111, the second light combining element 112, and the like, and in some embodiments, the excitation light source 101 may be located inside the housing 100 or outside the housing 100, where the light inlet is provided on the housing 100 when located outside the housing 100, and the excitation light source 101 is located at the light inlet.

In some embodiments, as shown in fig. 6 and 7, in order to enable the angle of the second light combining element 112 to be adjustable so as to form a predetermined angle greater than 0 with the first light combining element 111, the light source system of the present application further includes a support 1121, the support 1121 is disposed in the housing 100 of the light source system, the second light combining element 112 is mounted on the support 1121, the support 1121 is rotatably connected to the housing 100 through a rotation shaft, optionally, a rotation shaft hole is disposed on the support 1121, the rotation shaft may be inserted through the rotation shaft hole 1123 and connected to the housing 100, wherein the rotation shaft may be fixed on the housing 100 and the support 1121 may be rotated around the rotation shaft, or the rotation shaft may be rotatably connected to the housing 100 and the support 1121 is fixedly connected to the rotation shaft.

In some embodiments, the light source system of the present application further includes a locking member, which connects the support 1121 and the housing 100, and is used to maintain the first light combining element 111 and the second light combining element 112 at the predetermined included angle, and when the second light combining element 112 and the first light combining element 111 are adjusted to the predetermined included angle by the support 1121, they may be locked by the locking member, wherein a locking hole 1122 is provided on the support 1121, and the locking member may connect the locking hole 1122 and the housing 100, thereby achieving a locking effect.

Illustratively, the second light combining element 112 may be mounted on the support 1121, such as by adhesive, snap fit, or any other suitable means, on the support 1121.

In some embodiments, the area of the light beam incident on the first light combining element 111 is larger than the area of the light beam incident on the second light combining element 112 on the second light combining element, for example, the ratio of the area of the light beam incident on the second light combining element 112 to the area of the light beam incident on the first light combining element 111 is less than or equal to 0.2, and by this arrangement, the loss of laser light caused by the second light combining element 112 can be reduced.

In some embodiments, the Etendue of the complementary light is less than the Etendue of the lasing light, where Etendue (Etendue) refers to the integral of the area through which the light beam passes and the solid angle occupied by the light beam. By such arrangement, the area of the light spot of the corresponding complementary light on the second light combining element 112 is also smaller, so that the area of the second light combining element 112 can be reduced, and the laser loss caused by the second light combining element 112 can be reduced.

In some embodiments, the second light combining element 112 includes a light-transmitting light combining substrate, on which an optical film layer is disposed, where the optical film layer is used to reflect the complementary color light emitted by the light-compensating light source 105, and also can be used to reflect the excitation light; alternatively, in some embodiments, the optical film layer is used to transmit the excitation light emitted from the excitation light source 101 and the light complementary to the excitation light emitted from the light complementary source 105. Alternatively, the optical film layer may be a polarizing film layer for transmitting polarized light of a first polarization state and reflecting polarized light of a second polarization state, or the optical film layer may be a reflective film for reflecting light of a predetermined wavelength band or for reflecting excitation light or complementary light of various colors, or the optical film layer may be a partially reflective film and a partially polarizing film layer.

In some embodiments, the optical film layer includes a plurality of film layers arranged on a surface of the light combining substrate, each film layer for reflecting complementary color light of one or more colors. The different optical film layers may also have a spacing between them or may also be connected to each other.

In some embodiments, the light source system may further include a beam shrinking lens 109, where the beam shrinking lens 109 may include one or more lenses, such as a convex lens or a concave lens, and the excitation light transmitted from the light transmitting area of the wavelength conversion device 104 exits after being condensed by the beam shrinking lens 109.

Further, in order to make the excitation light emitted from the beam shrinking lens 109 be used for light combination to compensate the blue light in the combined light and improve the brightness of the combined light, the light source system may further include a second light path conversion component, where the second light path conversion component is configured to guide the excitation light transmitted from the wavelength conversion device 104 to be incident on the first light combining element 111 again, and re-emitted at the light source system for light combination after being reflected by the first light combining element 111.

In some embodiments, as shown in fig. 2 to 7, the second optical path conversion component includes a first optical path conversion element, a collimating lens, a second optical path conversion element, and a beam splitting element, where the beam shrinking lens is disposed between the wavelength conversion device 104 and the first optical path conversion element, the excitation light transmitted from the wavelength conversion device 104 is condensed by the beam shrinking lens and then enters the first optical path conversion element, the first optical path conversion element (e.g. a first mirror) guides the excitation light to the collimating lens 123, the excitation light collimated by the collimating lens enters the second optical path conversion element, the second optical path conversion element (e.g. a second mirror) guides the excitation light to the beam splitting element, and the beam splitting element guides the excitation light to the first light combining element 111 and/or the second light combining element 112 and then exits, e.g. exits to the light exit lens 106.

Optionally, a light splitting element is disposed between the second light combining element 112 and the light supplementing light source 105, where the light splitting element may be a polarizing element or other suitable element, which may transmit the supplementing light and reflect the excitation light, and where the supplementing light may have a different polarization state from the excitation light, for example, one is S-polarized and one is P-polarized.

In some embodiments, the light source system of the present application may further include a second beam shrinking element (not shown) that may shrink and shape the light beam emitted from the light compensating light source 105 and then emit the light beam to the second light combining element 112, so as to reduce an overlapping area of a light spot of the light compensating light source 105 and a light spot of the laser, reduce a loss of the laser during light combining, thereby improving a light intensity of the combined light beam, and when the excitation light participates in light combining, further shrink and shape the excitation light and then emit the light beam to the first light combining element and/or the second light combining element 112.

Referring to fig. 2 and 3, the transmission process of the light in the light source system of the present embodiment is as follows: the excitation light emitted from the excitation light source 101 is incident to the first light combining element 111 after passing through the first beam shrinking element 102, the flare shaping assembly 107 and the filtering element 108, the first light combining element 111 reflects the excitation light to the lens group 103, the excitation light is incident to the wavelength conversion device 104 after being condensed by the lens group 103, wherein when the light irradiates the wavelength conversion material on the wavelength conversion device 104, laser light is generated, the laser light is reflected and enters the first light combining element 111 after passing through the lens group 103, and enters the light emitting lens 106 after exiting from the first light combining element 111, the light emitting lens 106 emits light from the light emitting opening of the light source system for light combination, the wavelength conversion device 104 rotates after passing through the first light combining element 111 and enters the first light path conversion element 121 after being condensed by the beam shrinking lens 109, the first light path conversion element 121 (such as a reflector) guides the excitation light to the collimating lens 123, the excitation light collimated by the collimating lens 123 enters the second light path conversion element 122, the second light conversion element (such as a reflector) guides the excitation light to the second light path conversion element 122 or the light emitting from the light emitting element 106 to the light emitting element 124 when the light combining element 106 and the light emitting from the light emitting element 106. The light compensating light source 105 emits light of compensating light, the light of compensating color is incident to the second light combining element 112 after passing through the light splitting element 124, the light of compensating color is reflected by the second light combining element 112 to the light emitting lens 106, the light emitting lens 106 emits light out of the light emitting port of the light source system for light combining, wherein the inclination angle of the second light combining element 112 can be adjusted, and the angle of the light emitting element can be adjusted to enable the angle of the light emitting element to be more approximate to or larger than the angle of the light emitted by the light emitting lens 106, so that the reflection angle of the light after entering the light homogenizing device such as a light homogenizing rod is increased, the reflection frequency of the light of compensating light in the light homogenizing device is increased, the light homogenizing effect is improved, the angle adjustment does not influence the reflection frequency of the light in the light homogenizing rod, so that the energy loss caused by the laser is reduced, and the lengthened light homogenizing device such as a long light homogenizing rod or a compound eye system can be not used due to the increase of the reflection frequency of the light of compensating light, so that the problem that the volume of a projection device such as a long light homogenizing rod or a compound eye system is increased is avoided, and the cost is increased due to the use of the lengthened light homogenizing rod or the compound eye system.

The light of the complementary colors can be lighted in time sequence, wherein the lighting time sequence of the complementary colors is synchronous with the time sequence of the laser light with the same color generated by the wavelength conversion part, and the complementary colors with the same color as the excitation light are synchronous with the time sequence of the excitation light for combining light, so that the laser light, the excitation light and the complementary colors with the same color are combined and converged.

In another embodiment of the present application, as shown in fig. 8, the present application further provides a light source system, including:

an excitation light source 101 for emitting excitation light;

the light supplementing light source 105 is used for emitting light supplementing light;

a first light combining element 111 for guiding the excitation light to the wavelength conversion device 104, and guiding the excitation light and the complementary color light for combining light;

the first light path conversion component 13 is disposed between the light outlet of the light source system and the light homogenizing device of the projection device, and is used for adjusting the incident angle of the complementary color light entering the light homogenizing device of the projection device.

Through setting up first light path conversion component, can adjust the angle of complementary light, increase the reflection number of times after entering the dodging device such as dodging stick behind the complementary light photosynthetic, thereby can improve the dodging effect, the picture luminance color homogeneity of output when making the application projection equipment is better. In addition, by adjusting the incidence angle, a light homogenizing rod in an optical machine system is not required to be lengthened or a compound eye system is adopted, a better light homogenizing effect can be achieved, the size of projection equipment is reduced, the cost is reduced, the reflection times of laser receiving can not be increased, and therefore the efficiency of laser receiving is improved; in addition, even if the compound eye system is adopted as a light homogenizing device, the three-color laser beam does not need to be expanded due to adjustment of the incident angle, so that the optical cost is correspondingly reduced, and the light combining efficiency is not influenced.

The main differences compared to the previous embodiments are: in this embodiment, a first optical path conversion component is disposed at a light outlet of an optical system. For further details, reference is made to the relevant description above, which is not repeated here.

In this embodiment, the light source system may include only the first light combining element 111 for guiding the excitation light to the wavelength conversion device 104, and guiding the laser light and the complementary color light for combining light, or, on the basis of the optical system of the foregoing embodiment, only the first light path conversion component is added to the light outlet of the optical system, that is, the light source system may include the first light combining element 111 and the second light combining element 112, where the two light combining elements may be integrated, or the second light combining element 112 may be set to be adjustable or may be set to be fixed.

The optical path conversion assembly of the optical system of the present application will be explained taking the case of including only the first light combining element 111 as an example, as shown in fig. 8 and 9A, the first optical path conversion assembly 130 includes a first mirror 131 and a second mirror 132, the first mirror 131 and the second mirror 132 are disposed between the light outlet of the light source system and the light homogenizing device of the projection apparatus, the first mirror 131 is used for reflecting the laser light to the light homogenizing device, the second mirror 132 is used for reflecting the complementary color light to the light homogenizing device, or the second mirror 132 is used for reflecting the laser light and the complementary color light to the light homogenizing device, in some embodiments, the first mirror 131 may also reflect the excitation light for combining light, the second mirror 132 may reflect the complementary color light and/or the excited light, wherein, in order to independently adjust the angle of the complementary color light, the second mirror 132 may reflect only the complementary color light. Alternatively, the area of the first mirror 131 scanned by the light beam is larger than the area of the second mirror 132 scanned by the light beam. It should be noted that the first mirror 131 is further away from the light-emitting lens 106 than the second mirror 132 as illustrated in fig. 8 and 9A, but in some embodiments, the second mirror 132 may be further away from the light-emitting lens 106 than the first mirror 131.

In some embodiments, the first mirror 131 and the second mirror 132 are disposed side by side on the same plane, or an included angle is formed between the first mirror 131 and the second mirror 132, and the included angle can be adjusted according to actual needs.

In some embodiments, the first mirror 131 may be configured to have an adjustable inclination angle, in particular, the first mirror 131 may have an angle adjustment degree of freedom in a direction perpendicular to the reflecting surface thereof, and the second mirror 132 may be configured to have an adjustable inclination angle, in particular, the second mirror 132 may have an angle adjustment degree of freedom in a direction perpendicular to the reflecting surface thereof, and by adjusting the inclination angles of the first mirror 131 and the second mirror 132, the lasing and/or complementary light, and the emission angle of the excitation light for combining light may be adjusted, wherein the inclination angle may refer to an acute angle between the reflecting surface of the mirror and the optical axis direction of the light-emitting lens 106. For example, when the first reflecting mirror 131 reflects the laser light, the inclination angle of the first reflecting mirror can be adjusted to adjust the exit angle of the laser light, so that the first reflecting mirror can have optimal coupling efficiency with a light homogenizing device such as a light homogenizing rod, and the second reflecting mirror 132 is configured to adjust the inclination angle of the second reflecting mirror, so that the complementary color light energy and the light homogenizing rod have better coupling efficiency and the incident angle close to the laser light enter the light homogenizing device such as the light homogenizing rod, so that the reflection times after entering the light homogenizing rod are increased, the light homogenizing effect is improved, and the brightness and color uniformity of the image output when the projection device is applied are better.

In some embodiments, the light source system further includes a housing, a first support and a second support, the housing has an accommodating space therein, the first light combining element 111 and the second light combining element 112 are disposed in the housing, the housing has a light outlet, the first mirror 131 is disposed in the first support, the second mirror 132 is disposed in the second support, the first mirror 131 is rotatably connected to the housing through the first support, and the second mirror 132 is rotatably connected to the housing through the second support, thereby realizing the adjustable inclination angle. Optionally, a first adjusting mechanism is disposed on the first support, the first adjusting mechanism is configured to adjust the inclination angle of the first mirror 131, and a second adjusting mechanism is disposed on the second support, and the second adjusting mechanism is configured to adjust the inclination angle of the second mirror 132. The first adjustment mechanism and the second adjustment mechanism may be any mechanism capable of adjusting the inclination angle of the reflecting mirror, such as a lifting mechanism or a rotating mechanism.

In other embodiments of the present application, as shown in fig. 9B, the first optical path conversion component 130 may further include a refractive element, such as a prism or other suitable refractive element, where the prism may be a triangular prism, the complementary light emitted from the light emitting lens 106 may be incident on the refractive element, and the refractive element enlarges the angle of the complementary light passing through the refractive element and the excited light entering the light homogenizing device (this enlargement may refer to when the refractive element is not provided), without changing the angle of the excited light not passing through the refractive element entering the light homogenizing device, and may increase the number of reflections after the complementary light enters the light homogenizing device, such as a light homogenizing rod, so as to improve the light homogenizing effect and make the brightness and color uniformity of the image output when the projection apparatus is applied better. In addition, by adjusting the incidence angle, a light homogenizing rod in an optical machine system is not required to be lengthened or a compound eye system is adopted, a better light homogenizing effect can be achieved, the size of projection equipment is reduced, the cost is reduced, the reflection times of laser receiving can not be increased, and therefore the efficiency of laser receiving is improved; in addition, even if the compound eye system is adopted as a light homogenizing device, the three-color laser beam does not need to be expanded due to adjustment of the incident angle, so that the optical cost is correspondingly reduced, and the light combining efficiency is not influenced.

In other embodiments, the first light path conversion assembly 130 may also include mirrors and refractive elements or other suitable elements.

In some embodiments, as shown in fig. 9B, the light source system of the present application may further include a second beam shrinking element 140, where the light beam emitted from the light compensating light source 105 may be shrunk and shaped and then emitted to a light combining element, for example, a first light combining element or a second light combining element, so as to be beneficial to reducing the overlapping area of the light spot of the light compensating light source 105 and the light spot of the laser, reducing the loss of the laser during light combining, thereby improving the light intensity of the light combining light beam, and when the excitation light participates in light combining, the light source system is further used to shrink and shape the excitation light and then emitted to the first light combining element and/or the second light combining element. The second beam shrinking element 140 may be a lens or a combination of a plurality of lenses, and the lens may be a spherical lens or an aspherical lens.

The light source system of the present application may be applied to any application scenario requiring synthetic light, including but not limited to digital light processing (Digital Light Processing, DLP) systems, liquid crystal displays (Liquid Crystal Display, LCD), liquid crystal on silicon (Liquid Crystal on Silicon, LCOS) systems. Preferably in a DLP system.

FIG. 10 is a schematic block diagram of a projection apparatus according to an embodiment of the present application, and as shown in FIG. 10, the projection apparatus 800 includes a light source system 810, a light evening device 820, and a light engine 830 as described above;

the light homogenizing device 820 is configured to perform spot shaping on the light beam emitted from the light source system 810 to obtain an illumination light beam, where the shaping may be referred to as light homogenizing, and the light homogenizing device includes a light homogenizing rod or a compound eye system, where the light homogenizing rod plays a role in converging light, and the compound eye system plays a role in generating parallel light;

the optical engine 830 is configured to convert the illumination beam into an image beam;

the projection device may further comprise a projection lens for emitting the image beam.

Illustratively, the light bars are generally divided into hollow light bars and solid light bars. The hollow light homogenizing rod is formed by splicing four side walls with the inner walls coated with reflecting films, and the reflecting films can uniformly emit light beams entering the light homogenizing rod after reflecting for multiple times. The solid light homogenizing rod does not need coating, the light beams enter the light homogenizing rod and directly lean on the glass total reflection of the outer wall, and the light beams with a plurality of divergent angles are subjected to repeated reflection, so that the purpose of uniform light beam distribution can be achieved, and the homogenizing effect of the light homogenizing rod is further realized.

Illustratively, the fly-eye system may include a microlens array (which may also be a fly-eye lens) obtained by arranging individual lenslets according to a certain rule, and may further include a collimation system, at least one group of fly-eye lenses, and a condenser lens. The light emitted by the light source system can be homogenized through the compound eye system.

In the system shown in fig. 10, the light-emitting lens 106 in the light source system 810 is converged by the light-combining beam and then enters the light-homogenizing device 820, or the light-emitting lens 106 emits the light and then enters the light-homogenizing device 820 after being reflected by the first light path conversion component, such as the first reflector and the second reflector, and then enters the optical machine 830, and the optical machine 830 converts the illumination beam into an image beam and then projects the image beam through the projection lens for displaying, such as displaying an image, such as an image or a video, on a display interface such as a curtain.

The explanation and description of the light source system of the present application are completed, and other elements may be included in the complete light source system, which is not described herein.

The construction of a complete projection device is not described herein, and those skilled in the art will appreciate that the projection device of the present application may include other necessary components.

Since the projection apparatus of the present application includes the aforementioned light source system, it has the same advantages as the aforementioned light source system.

Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above illustrative embodiments are merely illustrative and are not intended to limit the scope of the present application thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the application. All such changes and modifications are intended to be included within the scope of the present application as set forth in the appended claims.

In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in order to streamline the application and aid in understanding one or more of the various application aspects, various features of the application are sometimes grouped together in a single embodiment, figure, or description thereof in the description of exemplary embodiments of the application. However, the method of the present application should not be construed as reflecting the following intent: i.e., the claimed application requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this application.

It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be combined in any combination, except combinations where the features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.

The foregoing description is merely illustrative of specific embodiments of the present application and the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present application. The protection scope of the application is subject to the protection scope of the claims.

Claims

1. A light source system, the light source system comprising:

an excitation light source for emitting excitation light;

the light supplementing light source is used for emitting supplementing light;

2. The light source system of claim 1, wherein the second light combining element has a predetermined angle with the first light combining element, wherein the predetermined angle is no greater than 45 °.

3. The light source system of claim 1, wherein a central axis of the second light combining element is different from a central axis of the first light combining element, wherein the central axis of the second light combining element is perpendicular to the light incident surface of the second light combining element, and the central axis of the first light combining element is perpendicular to the light incident surface of the first light combining element.

4. The light source system of claim 1, wherein the second light combining element is configured to reflect the complementary color light emitted by the complementary light source to the light-emitting lens.

5. The light source system of claim 1, wherein the second light combining element is parallel to or integral with the first light combining element.

6. The light source system of claim 1, further comprising a bracket and a housing, the bracket being disposed within the housing, the second light combining element being mounted to the bracket, the bracket being rotatably coupled to the housing by a rotation shaft.

7. The light source system of claim 7, further comprising a locking member connecting the bracket and the housing, the locking member configured to maintain the first light combining element and the second light combining element at a predetermined angle.

8. The light source system of claim 1, wherein a spot area of the light beam incident on the first light combining element is larger than a spot area of the light beam incident on the second light combining element.

9. The light source system of claim 1, wherein the complementary color light has an etendue that is less than an etendue of the lasing light.

10. The light source system according to claim 1, wherein the wavelength conversion device includes a substrate and a driving module, and the substrate of the wavelength conversion device is provided with a wavelength conversion portion and a light transmission region for transmitting excitation light incident on the wavelength conversion device.

11. The light source system of claim 10, further comprising a second light path conversion assembly for directing excitation light transmitted from the wavelength conversion device to be re-incident on the first light combining element.

12. The light source system according to claim 11, wherein the light source system further comprises a beam reduction lens, the second light path conversion component comprises a first light path conversion element, a collimator lens, a second light path conversion element, and a beam splitting element, the beam reduction lens is disposed between the wavelength conversion device and the first light path conversion element, the excitation light transmitted from the wavelength conversion device is reduced by the beam reduction lens and then enters the first light path conversion element, the first light path conversion element guides the excitation light to the collimator lens, the excitation light collimated by the collimator lens enters the second light path conversion element, the second light path conversion element guides the excitation light to the beam splitting element, and the beam splitting element guides the excitation light to the first light combining element and/or the second light combining element.

13. The light source system of claim 12, wherein the first light path conversion element is a mirror and the second light path conversion element is a mirror.

14. The light source system of claim 1, wherein the first light path conversion assembly is configured to adjust an incident angle of the complementary color light into a light homogenizing device of the projection apparatus, the first light path conversion assembly includes a first mirror and a second mirror, the first mirror and the second mirror are disposed between a light outlet of the light source system and the light homogenizing device of the projection apparatus, the first mirror is configured to reflect the laser light to the light homogenizing device, the second mirror is configured to reflect the complementary color light to the light homogenizing device, or the second mirror is configured to reflect the laser light and the complementary color light to the light homogenizing device.

15. The light source system of claim 14, wherein the first reflector and the second reflector are disposed side-by-side on a same plane or have an included angle therebetween.

16. The light source system of claim 14, wherein the first reflector is configured to be tilted at an angle, and the second reflector is configured to be tilted at an angle.

17. The light source system of claim 14, further comprising a housing, a first support, and a second support, wherein the housing has a receiving space therein, the first light combining element and the second light combining element are disposed in the housing, the housing has a light outlet, the first reflector is disposed on the first support, the second reflector is disposed on the second support, the first reflector is rotatably connected to the housing through the first support, and the second reflector is rotatably connected to the housing through the second support;

18. The light source system of claim 16, wherein the first mirror is scanned by the light beam over an area greater than the second mirror is scanned by the light beam.

19. The light source system of claim 1, wherein the first light path conversion assembly comprises a refractive element configured to increase an angle at which complementary color light and stimulated luminescence passing therethrough enter the light homogenizing device.

20. The light source system according to any one of claims 1 to 19, wherein a wavelength of the complementary light is different from a wavelength of the excitation light.

21. A projection device, characterized in that the projection device comprises a light source system according to any of claims 1 to 20, a light homogenizing means and a light engine;