CN117270304A - Light source system and projection device - Google Patents

Abstract

The present application protects a light source system comprising: the first light module comprises a first light source and a second light source, wherein the first light source is used for emitting first light, and the second light source is used for emitting second light. The second optical module comprises a third light source, and the third light source is used for emitting third light. The light combining module is used for combining the first light, the second light and the third light, wherein the optical expansion of the first light and the second light is larger than that of the third light, the third light is red laser, the light path distance from the third light source to the light outlet of the light combining module is larger than that from the first light source to the light outlet of the light combining module, and the light path distance from the third light source to the light outlet of the light combining module is larger than that from the second light source to the light outlet of the light combining module. Compared with the scheme of wavelength light combination, the design difficulty and the manufacturing difficulty of optical elements in the light combination module are reduced.

Description

Light source system and projection device

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a light source system and a projection apparatus.

Background

With the improvement of informatization technology, people have increasingly demanded to facilitate interactive display, for example, an interactive space needs to be created, a surface is provided for virtual activities, such as games, art, puzzles and the like, and the people feel the experience of being in person. Although mobile phones and intelligent tablets can realize convenient display, the display mode is limited, and real interactive display is difficult to realize. Therefore, to achieve flexible interactive display, projection technology routes are only available.

In the conventional projection convenient interaction technology, the requirement of a scene on brightness is not high, so that white light emission is realized by adopting an LED combined light source mostly, however, due to the fact that the brightness of the LED light source is insufficient, the design difficulty of related optical elements is high, the volume of the light source is difficult to reduce, key optical elements in the light source cannot be produced in large scale, meanwhile, due to the fact that the light combining efficiency of the LED light source is low, the service life is short, a light source device needs to be replaced frequently, the color gamut of the LED combined light source is limited, and the requirement of a user on high-quality projection interaction space cannot be met, so that the problem to be solved by a person in the field of a light source system with low cost, small volume, high brightness and good color gamut is provided.

Disclosure of Invention

In view of the foregoing drawbacks of the prior art, an aspect of the present application provides a light source system with low cost, small size, high brightness, and good color gamut to better adapt to a projection system, including: the first optical module comprises a first light source and a second light source, wherein the first light source is used for emitting first light, and the second light source is used for emitting second light. The second light module comprises a third light source for emitting third light. The light combining module is used for combining the first light, the second light and the third light, wherein the optical expansion of the first light and the second light is larger than that of the third light, the third light is red laser, the optical path distance from the third light source to the light outlet of the light combining module is larger than that from the first light source to the light outlet of the light combining module, and the optical path distance from the third light source to the light outlet of the light combining module is larger than that from the second light source to the light outlet of the light combining module.

In some embodiments, the first light is blue light and the second light is green light, and an optical path distance from the first light source to the light outlet of the light combining module is greater than an optical path distance from the second light source to the light outlet of the light combining module.

In some embodiments, the first light module further comprises: the collecting assembly comprises a first collecting assembly and a second collecting assembly, and the first collecting assembly and the second collecting assembly are respectively used for collecting the first light and the second light; the polarizing assembly is arranged behind the collecting assembly and comprises a first polarizing assembly and a second polarizing assembly, and the first polarizing assembly and the second polarizing assembly are respectively used for polarizing the first light and the second light; the recycling assembly is arranged behind the polarizing assembly and comprises a first recycling assembly and a second recycling assembly, and the first recycling assembly and the second recycling assembly are respectively used for recycling the first light and the second light so that the first light and the second light are recycled to the first light source or the second light source.

In some embodiments, the second light module further comprises: a first reflecting mirror for reflecting the third light so that the third light is incident into the light combining module; and the speckle dissipating assembly is arranged between the first reflecting mirror and the light combining module or behind the light combining module and is used for dissipating speckle of the third light.

In some embodiments, the light combining module includes a first light combining component and a second light combining component: the first light combination component is used for transmitting the third light and reflecting the first light or the second light; the second light combination component is arranged on an emergent light path of the first light combination component and is used for transmitting the third light and the first light, reflecting the second light or transmitting the third light and the second light and reflecting the first light.

In some embodiments, the light combining module includes a third light combining component and a fourth light combining component: the third light combining component comprises a central hole part and a peripheral part, wherein the central hole is used for transmitting the third light, and the peripheral part is used for reflecting the first light or the second light so as to realize expansion amount light combining; the fourth light combining component is arranged on an emergent light path of the third light combining component and comprises a second central hole and a second peripheral part, the second central hole is used for transmitting the third light and the first light, and the peripheral part is used for transmitting the first light to reflect the second light or transmitting the second light to reflect the first light.

In some embodiments, the first light module further includes a first supplemental light source, the supplemental light source is configured to emit excitation light, the excitation light irradiates on the first light source or the second light source, a first light or a second light fluorescent powder is disposed on a surface of the first light source or the second light source, the excitation light irradiates on the fluorescent powder to generate supplemental light, and the supplemental light is reflected by the first light source or the second light source and then enters the light combining module.

In some embodiments, the light source system further comprises a collimating lens, the collection assembly being a cone reflector or a collection lens, the collimating lens being disposed on an exit light path of the cone reflector to collimate the light rays.

In some embodiments, the light source system further includes a light homogenizing module, and the light homogenizing module is disposed on an optical path from which the light combining module emits light, and is configured to homogenize the light after the light combining module combines the light.

On the other hand, the application also provides a projection device which comprises the light source system.

In some embodiments, the projection device further comprises: the optical modulation module comprises an optical modulator, wherein the optical modulator is LCOS and a lens system, and the lens system is a direct-casting lens or an ultra-short focal lens.

Compared with the prior art, the projection technology is realized by adopting a plurality of LEDs in the prior art, the luminous efficiency of the light source system can be improved, the color gamut range of the picture emitted by the projection device is improved, the design difficulty of the key optical element is reduced, the need of frequently replacing light source devices is avoided, and the possibility is provided for the larger-scale mass production of projection products.

Drawings

FIG. 1 is a schematic diagram of the basic optical architecture of a light source system;

FIG. 2A is a schematic view of a first embodiment of a light source system according to the present application;

FIG. 2B is another schematic view of a first embodiment of a light source system according to the present application;

fig. 3 is a schematic structural diagram of a second embodiment of a light source system of the present application;

fig. 4 is a schematic structural diagram of a light combining module of a third embodiment of the light source system of the present application.

FIG. 5 is a schematic view of a projection apparatus according to the present application;

fig. 6 is another schematic structural diagram of the projection device of the present application.

Detailed Description

In the related art, white light emission is mostly realized by adopting a light source formed by combining red LEDs, blue LEDs and green LEDs, the LED light source is insufficient in brightness, and higher brightness can be realized only by increasing the number of LEDs under the environment with slightly higher brightness requirement, and the combination of the light source is realized by combining a first red LED, a second red LED, a green LED and a blue LED generally due to the maximum brightness requirement of the red LEDs, but the expansion of the light emitted by the LEDs is larger, and in the light combination process, especially the light combination process of the red LEDs and the green LEDs, the design difficulty and the light combination efficiency of the light combination element are higher, and the whole volume of the light source is larger under the same brightness requirement due to the use of a plurality of LEDs, so that a light source system with small volume, high brightness and high light combination efficiency is urgently needed.

Therefore, the novel light source system makes full use of the optical expansion difference of the LED light source and the laser light source, redesigns the layout form of the optical elements, and can effectively reduce cost, reduce volume, improve brightness and improve color gamut. It can be understood that the projection device can be used for projectors such as business machines and educational machines in the traditional projection industry, and can be better applied to interactive projection scenes such as desktop projection, miniature projector and mobile phone integrated projection due to simple structure and strong functions, thereby having very wide application prospect.

Referring to fig. 1, a basic optical architecture of a light source system of the present application is shown, and the light source system includes a first light module 10, a second light module 20, a light combining module 30 and a light homogenizing module 40. The first light module 10 comprises a first light source 11 and a second light source 12, the first light source 11 being adapted to emit first light and the second light source 12 being adapted to emit second light, which in some embodiments may be blue light or green light, the second light being green light or blue light. The second light module 20 comprises a third light source 21, the third light source 21 being arranged to emit third light, in this embodiment red light. The light combining module 30 is configured to combine the first light, the second light, and the third light, and may adopt a wavelength light combining mode or an extended amount light combining mode, and detailed structures will be described later, which will not be described herein. The expansion of the first light and the second light is larger than that of the third light, for example, the first light and the second light can be broad spectrum light emitted by an LED or fluorescent light, and the fluorescent light can be generated in a form of a fixed fluorescent wheel, a color wheel and the like, which is not limited herein. The third light may be a laser, preferably a linearly polarized laser. Because the optical expansion of the first light and the second light is larger than that of the third light, when the first light, the second light and the third light are combined, the difference of the three light in the spectrum and the difference of the three light in the optical expansion can be fully utilized, and the volume can be further reduced on the premise that the brightness is further improved after the light source is combined. Meanwhile, as the optical expansion of the first light source and the second light source in the first light module is larger, the light emitted by the first light module 10 can be recycled by fully utilizing the non-imaging optical principle, and the light emitting efficiency of the light sources is obviously improved.

The examples of the present application will be described in detail below with reference to the drawings and the embodiments.

Fig. 2A is a schematic structural diagram of a first embodiment of a light source system of the present application. The first light module 10 of the light source system 1000 includes a first light source 11 and a second light source 12, specifically includes a light source assembly, a collecting assembly, a polarizing assembly and a recycling assembly, where the light source assembly includes a first light source assembly 111 and a second light source assembly 121 for emitting a first light and a second light, in this embodiment, the first light source assembly 111 and the second light source assembly 121 are LED light sources, the first light is blue light, the second light is green light, preferably, the spectrum range of the first light is 480±15nm, and the spectrum range of the second light is 538nm±15nm; the collecting assembly is arranged on an emergent light path of the light source assembly and comprises a first collecting assembly 121 and a second collecting assembly 122, and the first collecting assembly 121 and the second collecting assembly 122 are respectively used for collecting light rays emergent from the first light source assembly 111 and the second light source assembly 121 and irradiating the light rays onto the polarizing assembly; the polarizing component is disposed on the outgoing light path of the collecting component, and includes a first polarizing component 113 and a second polarizing component 123, which are configured to polarize the first light and the second light that are outgoing from the collecting component, so as to match with a subsequent optical-mechanical system (details are not described in detail below), where the first polarizing component 113 and the second polarizing component 123 may use linear polarizers to polarize; on the outgoing light path of the polarizing component, a recycling component is further provided, where the recycling component includes a first recycling component 114 and a second recycling component 124, and the recycling component is configured to pass the light in the first polarization state polarized by the first polarizing component 113 and the second polarizing component 123, and reflect the light in the second polarization state perpendicular to the first polarization state back to the light source component for reuse. In some embodiments, the recycling component is a reflective polarizing brightness enhancement film (DBEF, dual brightness enhancement film). In some embodiments, the first polarization component and the first recycling component are integrally designed, so that the volume of the first optical module can be effectively reduced.

In some embodiments, the light source system further includes a collimating lens 1121 (1221), which may be implemented as a cone reflector 1221 (1222) or a collecting lens 1221 (1222), disposed on the exit light path of the cone reflector. The smaller area of the conical reflector 1221 is provided with an incident surface at one end, and the larger area of the conical reflector 1221 is provided with an emergent surface at one end, so that after the first light or the second light emitted by the light source assembly is incident into the conical reflector through the incident surface, the first light or the second light is emergent or directly emergent through the emergent surface after being reflected by the side wall of the conical reflector, so that the area of an emergent light spot is larger than that of the incident light spot, the divergence angle of a light beam is reduced, and the first light or the second light is emergent in a non-imaging mode to be matched with a subsequent modulated light module. The cone reflector 1221 in this embodiment is a solid cone light guide rod, and the light beam is reflected at the side of the cone reflector 1221 by total reflection. In other embodiments of the present application, the conical reflector 1221 may also be a hollow conical reflector formed by a reflecting plate/reflecting surface, which is not described here again. The collimating lens can adopt a Fresnel lens, a free-form surface lens and the like, and can collimate the light spots so as to be matched with the illumination part required by the subsequent modulation panel. In some embodiments, referring to fig. 3, the first optical module further includes a supplementary light source 13, the supplementary light source 13 is configured to emit excitation light, the excitation light irradiates the first light source 10 or the second light source 11, a first light or a second light fluorescent powder is disposed on a surface of the first light source 11 or the second light source 12, the excitation light irradiates the fluorescent powder to generate supplementary light, the supplementary light is reflected by the first light source 10 or the second light source 11 and then irradiates the light combining module 30, in this embodiment, the supplementary light is blue laser, the first light source is a blue LED, the second light source is a green LED, a green fluorescent powder is disposed on a surface of the second light source, after the green fluorescent powder irradiates the surface of the second light source, green fluorescent light is generated by remote excitation, and after the green fluorescent light is reflected by the green LED, the green fluorescent light irradiates the light combining module. With such an arrangement, the efficiency of the light source system to generate green light can be further increased, which arrangement contributes to a significant increase in the light source brightness, since the green light contributes more to the brightness in white light.

In some embodiments, please continue to refer to fig. 2A, the second light module 20 includes a third light source 21, a first reflecting mirror 22, a resolving macula component 23 and a collimating component 24, wherein the third light source 21 is configured to emit third light, the third light source is preferably red laser, the spectrum range of the third light source is 625nm+2nm, and the color rendering effect is better and the user experience is effectively improved because the difference between the spectrum ranges of the third light emitted by the third light source and the spectrum ranges of the first light emitted by the first light source and the second light emitted by the second light source is larger, so that the design difficulty of the light combining module 30 is smaller, and meanwhile, the color coordinate of the third light source is closer to the color gamut extremum than the red wide spectrum light emitted by the LED red light source, so that the color gamut range of the light source system is larger than the color gamut range of the combined light source of the red LED, the blue LED and the green LED. The first reflecting mirror is mainly used for reflecting the third light, so that the third light is injected into the light combining module 30, and the first reflecting mirror can fully utilize the space of the first light source and the second light source in the transverse direction when seen from the light path architecture shown in fig. 2A, and meanwhile, the design can limit the volume of the light source system on the basis of reducing interference between the light source components. In some embodiments, the speckle eliminating component 23 is disposed between the first reflecting mirror and the light combining module, so that on one hand, speckle of the third light can be effectively eliminated, efficiency of white light emitted by the light source system is improved, and on the other hand, the etendue of the third light can be widened, so that the first light, the second light and the third light can be fully contacted in the light combining module, and better light combining is realized; in some embodiments, the first mirror and the speckle reduction assembly are integrally designed to reduce speckle and reflect third light; in other embodiments, the speckle dissipating component 23 is disposed behind the light combining module 30 and in front of the light homogenizing module 40, so that the difference between the etendue of the third light and the first and second light can be fully utilized, and the light combining efficiency of the light combining module can be improved.

In some embodiments, for the solution that the speckle dissipating component 23 is disposed between the first mirror and the light combining module, please refer to fig. 2A, the light combining module 30 may include a first light combining component 31 and a second light combining component 32, where the first light combining component 31 is a wavelength light combining component, that is, the first light combining component is configured to transmit first light or second light, the second light combining component 32 is a wavelength light combining component, the second light combining component 32 is disposed on an outgoing light path of the first light combining component 31, the second light combining component 32 is configured to transmit third light, the first light, reflect the second light, or be configured to transmit third light, the second light, reflect the first light, in this embodiment, the first light combining component 31 is configured to transmit red light, reflect green light, and reflect blue light, in other embodiments, as shown in the solution in fig. 3, the first light combining component is configured to transmit red light and blue light, the second light, and the second light combining component is configured to transmit blue light, and the second light combining component is configured to reflect red light and reflect green light. Through such a setting, the expansion amount of the third light after the speckle is dissipated by the speckle dissipating component 23 can be ensured to be matched with the expansion amounts of the first light and the second light, so that light combination can be realized through a wavelength light combination mode, and the speckle dissipating component 23 can be integrally designed with the first reflecting mirror, so that the light path volume can be further reduced.

In other embodiments, for the solution that the speckle dissipating component 23 is disposed between the light combining module and the light homogenizing module 40, please refer to fig. 2A with reference to fig. 3 and fig. 4 (a) and 4 (b), the light combining module 30 may include a third light combining component 33 and a fourth light combining component 34. The third light combining member 33 includes a central hole portion 331 for transmitting the third light and a peripheral portion 332 for reflecting the first light or the second light to achieve spread amount light combining. The fourth light combining component 34 is disposed on the light outgoing path of the third light combining component 33, and the fourth light combining component includes a second central hole 341 and a second peripheral portion 342, where the second central hole 341 is used for transmitting the third light and the first light, and the peripheral portion 342 is used for transmitting the first light and reflecting the second light or is used for transmitting the second light and reflecting the first light. In some embodiments, the central hole 331 of the third light combining element 33 is configured to transmit a small expansion of the third light, the peripheral portion 332 is configured to reflect the green light, the second central hole 341 of the fourth light combining element is configured to transmit a small expansion of the red laser light, the green light, and the second peripheral portion 342 of the fourth light combining element 34 is configured to transmit the green light, and reflect the blue light. In other embodiments, as shown in fig. 3, the first central hole of the third light combining component is configured to transmit red laser light and blue supplemental light, the first peripheral portion is configured to reflect green light, the second peripheral portion of the fourth light combining component is configured to reflect blue light, and the second central hole portion of the fourth light combining component is configured to transmit red laser light and green light. Through such setting, the extension difference of extension and first light and second light that can make full use of third light to can realize the light combination through the extension mode of combining light, intersect in wavelength scheme of combining light, this scheme can furthest guarantee that red laser incident to follow-up optical system, because red light's efficiency is not high itself, such design can maximize utilizes red laser.

In some embodiments, the optical path distance from the third light source 21 to the light outlet of the light combining module 30 is greater than the optical path distance from the first light source 11 to the light outlet of the light combining module 30, and the optical path distance from the third light source 21 to the light outlet of the light combining module 30 is greater than the optical path distance from the second light source 12 to the light outlet of the light combining module 30. Specifically, referring to fig. 2B, the optical path distance from the first light source assembly 111 to the light outlet of the light combining module 30 is l2+d2+d1, the optical path distance from the second light source assembly 121 to the light outlet of the light combining module 30 is l1+d1, the optical path distance from the third light source 21 to the light outlet of the light combining module 30 is l3+d3+d2+d1, l3+d3+d2+d1 > l1+d1, and l3+d3+d2+d1 > l2+d2+d1. Of the three light sources of the first light source 11, the second light source 12, and the third light source 21, since the optical expansion amount of the third light is the smallest, the optical expansion amounts of the first light and the second light are both larger than those of the third light, and the light loss is more likely to occur in the propagation process than in the third light due to the characteristic that the light with the larger optical expansion amount is more lost in the propagation process. When the optical path is designed, the first light source 11 and the second light source 12 are preferably separated from the outlet of the optical module 30 relatively near, so that the optical losses of the first light and the second light can be relatively reduced.

In some embodiments, the first light is blue light, the second light is green light, and the optical path distance from the first light source to the light outlet of the light combining module is greater than the optical path distance from the second light source to the light outlet of the light combining module. Specifically, referring to fig. 2B, the optical path distance from the first light source assembly 111 to the light outlet of the light combining module 30 is l2+d2+d1, the optical path distance from the second light source assembly 121 to the light outlet of the light combining module 30 is l1+d1, the optical path distance from the third light source 21 to the light outlet of the light combining module 30 is l3+d3+d2+d1, and l3+d3+d2+d1 > l2+d2+d1 > l1+d1. In the two light sources of the second light source 12 and the first light source 11, since the green light contributes significantly to the brightness of the screen, the light loss needs to be preferentially reduced, so that when the optical path is designed, the second light source 12 is preferentially separated from the light module 30 relatively closer to the exit, the light loss of the green light can be relatively reduced, and the display screen is more bright.

It should be noted that, unlike the embodiment shown in fig. 2A, in the embodiment shown in fig. 2B, the first light combining component 31 is configured to transmit red light and reflect blue light, and the second light combining component 32 is configured to transmit red light and blue light and reflect green light.

With continued reference to fig. 2A, in some embodiments, the light source system further includes a light homogenizing module 40, where the light homogenizing module 40 is disposed on an optical path from the light converging module 30, and is used for homogenizing light after the light converging module 30 is converged, and preferably, the light homogenizing module 40 includes a light homogenizing element (not shown), and the light homogenizing element may be a fly eye lens or a square rod, and preferably, the light homogenizing element is a fly eye lens, and can adapt to an embodiment of light converging with an expansion amount of the light converging module.

Referring to fig. 5, a projection apparatus including a light source system according to the first embodiment-the third embodiment is provided, and the projection apparatus further includes a light modulation module 50 and a lens module 60.

In some embodiments, the light modulation module 50 includes a second reflecting mirror 51, a polarization splitting prism 52, and a light modulation component 53, where the inclination direction of the second reflecting mirror is parallel to the inclination direction of the first light combining component 31 and the second light combining component 32 in the light combining module 30, and the inclination angle of the first light combining component 31 and the second light combining component 32 is 135 degrees with the horizontal direction. The polarization splitting prism 52 is disposed on the outgoing light path of the second reflector, and is configured to irradiate the light reflected by the second reflector 51 into the light modulation component 53, where the light modulation component 53 is configured to modulate the incident light, a light splitting film is disposed in the middle of the polarization splitting prism 52, and an oblique direction of the light splitting film is parallel to an oblique direction of the second reflector 51, and is configured to reflect light of the first polarization state, and transmit light of the second polarization state, and the light modulation component 53 is a liquid crystal on silicon LCOS (Liquid Crystal on Silicon), and is capable of modulating light of the first polarization state, and in this embodiment, the light of the first polarization state is light of the S polarization state, and the light of the second polarization state is light of the P polarization state. The space between the right side of the light modulation module and the upper side of the light source system is also provided with a direct projection lens 60, so that the longitudinal space and the transverse space can be fully utilized, and the whole light path is compact in layout and small in size. Meanwhile, the LCOS is adopted for modulation, so that the principle of reflection type regulation and control can be fully utilized, and the volume of the optical path can be further compressed.

In some embodiments, please refer to another embodiment of the projection apparatus shown in fig. 6, in this embodiment, the light modulation module 50 includes a third reflector 51', a polarization beam splitter prism 52 and a light modulation component 53, wherein the inclination direction of the second reflector is perpendicular to the inclination direction of the first light combining component 31 and the second light combining component 32 in the light combining module 30, and the inclination angle of the first light combining component 31 and the second light combining component 32 is 135 degrees with the horizontal direction. The polarization splitting prism 52 is disposed on the outgoing light path of the second reflecting mirror 51', the polarization splitting prism 52 is provided with a splitting film, and the oblique direction of the splitting film is parallel to the oblique direction of the second reflecting mirror 51, so that the light reflected by the second reflecting mirror 51' is irradiated into the light modulating component 53, and the light modulating component 53 is used for modulating the incident light, where the polarization splitting prism 52 is used for reflecting the light in the first polarization state, and transmitting the light in the second polarization state, and the light modulating component 53 is the same as the previous embodiment and will not be described herein again. The space between the right side of the light modulation module and the left side of the light source system is also provided with the ultra-short focal lens, so that the longitudinal space and the transverse space can be fully utilized, and the whole light path is compacter in layout in the transverse space and smaller in size.

According to the light source system and the projection system, due to the fact that the first light module and the second light module with different optical expansion amounts are used, the light source system can emit higher brightness under the condition of extremely small volume, the third light is red laser, and due to the fact that the optical expansion amount of the third light emitted by the second light module is smaller than that of the first light and the second light emitted by the first light module, design difficulty and manufacturing difficulty of optical elements in the combined light module are reduced, compared with a technology of adopting a plurality of LEDs to achieve projection in the prior art, luminous efficiency of the light source system can be improved, color gamut range of pictures emitted by a projection device is improved, design difficulty of key optical elements is reduced, frequent replacement of light source devices is avoided, and possibility is provided for large-scale mass production of projection products.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims (10)

1. A light source system, comprising:

the first light module comprises a first light source and a second light source, wherein the first light source is used for emitting first light, and the second light source is used for emitting second light;

the second light module comprises a third light source, and the third light source is used for emitting third light;

the light combination module is used for combining the first light, the second light and the third light, wherein,

the etendue of the first light and the second light is larger than that of the third light, which is red laser light,

the light path distance from the third light source to the light outlet of the light combining module is greater than the light path distance from the first light source to the light outlet of the light combining module, and the light path distance from the third light source to the light outlet of the light combining module is greater than the light path distance from the second light source to the light outlet of the light combining module.

2. The light source system of claim 1, wherein the first light is blue light and the second light is green light, and wherein an optical path distance from the first light source to the light outlet of the light combining module is greater than an optical path distance from the second light source to the light outlet of the light combining module.

3. The light source system of claim 1, wherein the first light module further comprises:

the collecting assembly comprises a first collecting assembly and a second collecting assembly, and the first collecting assembly and the second collecting assembly are respectively used for collecting the first light and the second light;

the polarizing assembly is arranged behind the collecting assembly and comprises a first polarizing assembly and a second polarizing assembly, and the first polarizing assembly and the second polarizing assembly are respectively used for polarizing the first light and the second light;

the recycling assembly is arranged behind the polarizing assembly and comprises a first recycling assembly and a second recycling assembly, and the first recycling assembly and the second recycling assembly are respectively used for recycling the first light and the second light so that the first light and the second light are recycled to the first light source or the second light source.

4. The light source system of claim 1, wherein the second light module further comprises:

a first reflecting mirror for reflecting the third light so that the third light is incident into the light combining module;

and the speckle dissipating assembly is arranged between the first reflecting mirror and the light combining module or behind the light combining module and is used for dissipating speckle of the third light.

5. The light source system of claim 1, wherein the light combining module comprises a first light combining component and a second light combining component:

the first light combination component is used for transmitting the third light and reflecting the first light or the second light;

the second light combination component is arranged on an emergent light path of the first light combination component and is used for transmitting the third light and the first light, reflecting the second light or transmitting the third light and the second light and reflecting the first light.

6. The light source system of claim 1, wherein the light combining module comprises a third light combining component and a fourth light combining component:

the third light combining component comprises a central hole part and a peripheral part, wherein the central hole is used for transmitting the third light, and the peripheral part is used for reflecting the first light or the second light so as to realize expansion amount light combining;

the fourth light combining component is arranged on an emergent light path of the third light combining component and comprises a second central hole and a second peripheral part, the second central hole is used for transmitting the third light and the first light, and the peripheral part is used for transmitting the first light to reflect the second light or transmitting the second light to reflect the first light.

7. The light source system according to claim 5, wherein the first light module further comprises a first supplemental light source for emitting excitation light, the excitation light irradiates the first light source or the second light source, a first light or a second light fluorescent powder is arranged on the surface of the first light source or the second light source, the excitation light irradiates the fluorescent powder to generate the supplemental light, and the supplemental light is reflected by the first light source or the second light source and then enters the light combining module.

8. A light source system as recited in claim 3, further comprising a collimating lens, wherein the collection element is a cone reflector or a collection lens, and wherein the collimating lens is disposed on an exit light path of the cone reflector to collimate the light.

9. The light source system according to claim 1, further comprising a light homogenizing module, wherein the light homogenizing module is disposed on an optical path from which the light combining module emits light, and is configured to homogenize the light after the light combining module combines the light.

10. A projection apparatus, comprising:

the optical modulation module comprises an optical modulator, and the optical modulator is LCOS;

the lens system is a direct projection lens or an ultra-short focal lens; and

the light source system of claims 1-9.