Light combining system and projection device

Abstract

The application relates to the technical field of display, and discloses a light combination system and a projection device. In the light combination system provided by the embodiment, a light deflection area is arranged in a light guide element. The light deflection area can deflect the light entering the light deflection area, so that the light avoids the target area of the light splitting and light combination element and enters a subsequent light path, the loss of the light caused by the target area is reduced, the utilization rate of the light is improved, and the brightness of the projection device is improved.

Description

Technical Field

[0001] This application relates to the field of projection display technology, and in particular to a light combining system and projection device. Background Technology

[0002] In projection display products, the light combining system is a very important component. Its function is to convert light of different colors, angles, brightness and shape into a uniform light spot that illuminates the effective area of ​​the display chip.

[0003] In the field of projection display, traditional light bulbs are increasingly being phased out due to their inherent limitations, while new light sources such as LEDs, phosphors, and lasers exhibit superior characteristics in terms of brightness, color, lifespan, and energy consumption, gradually becoming the mainstream light sources for projection displays. Among these new light source technologies, LED light sources struggle to achieve high brightness, while laser light sources suffer from speckle issues. Therefore, achieving high brightness and high-quality image quality is a problem that urgently needs to be solved. Summary of the Invention

[0004] This application provides a light combining system that can be used in projection equipment, which can improve the light utilization rate of the light combining system, thereby increasing the brightness of the projection equipment.

[0005] In a first aspect, this application provides a light combining system, including a light source assembly, a light guiding element, a light splitting and combining element, and a light homogenizing element. The light splitting and combining element includes a target region, and the light guiding element includes a light deflection region, wherein:

[0006] Light source components are used to generate main light and supplementary light;

[0007] A light guiding element is used to guide the main light incident into the light guiding element to a light splitting and combining element, wherein the light rays in the main light that are incident into the light deflection area are deflected by the light deflection area, thereby entering a region outside the target region in the light splitting and combining element;

[0008] The beam splitter and combiner is used to combine the main light that enters the beam splitter and combiner from the side of the light guide element with the supplementary light that enters the beam splitter and combiner from the other side and is transmitted or reflected by the target area. The combined light is then injected into the homogenizing element.

[0009] A beam homogenizer is used to homogenize the combined light of the incoming main beam and supplementary beam before it is emitted.

[0010] In some embodiments, the shape of the light deflection area is V-shaped or arc-shaped, or the main light incident surface of the light deflection area is a V-shaped surface or a symmetrical arc surface.

[0011] In some embodiments, the length l of the longer side of the target region satisfies the following formula:

[0012]

[0013] Where θ represents the angle between the normal of the incident surface of the light-deflecting region and the optical axis of the principal beam, h represents the thickness of the light-deflecting region, n represents the refractive index of the light guiding element, and δ represents the angle between the normal of the light-splitting and light-combining element and the optical axis of the principal beam.

[0014] In some embodiments, the light source assembly includes an excitation light source, a wavelength conversion element, a beam splitting element, and a supplementary light source;

[0015] The excitation light generated by the excitation source is sent into the wavelength conversion element through the beam splitter. The wavelength conversion element is excited by the excitation light and emits the main light. The emitted main light is sent into the light guide element through the beam splitter, and then into the beam splitter and beam combiner. The beam is reflected or transmitted through the area outside the target area in the beam splitter and beam combiner.

[0016] The supplementary light generated by the supplementary light source is transmitted or reflected through the target area of ​​the light splitting and combining element, and then combined with the main light before entering the light homogenizing element.

[0017] In some embodiments, the supplemental light includes at least one of red light, blue light, and green light.

[0018] In some embodiments, when the supplementary light includes only one of red light, blue light, and green light, the light source assembly further includes a first light source, a second light source, a first light combining element, and a second light combining element; the main light and supplementary light after passing through the light splitting and combining elements also pass through the first light combining element and the second light combining element before entering the light homogenizing element;

[0019] The light generated by the first light source passes through the first light combining element and the second light combining element and enters the light homogenizing element;

[0020] The light generated by the second light source is incident on the homogenizing element through the second light combining element.

[0021] In some embodiments, the light source assembly further includes a target light source.

[0022] The light generated by the target light source is directed into the light guiding element through the beam splitting element, then into the beam splitting and combining element through the light guiding element, and finally reflected or transmitted to the light homogenizing element through the area outside the target region in the beam splitting and combining element.

[0023] In some embodiments, the light source assembly includes an excitation light source, a wavelength conversion element, and a supplementary light source.

[0024] The excitation light generated by the excitation source is transmitted or reflected through the target area of ​​the light splitter and combiner, and then enters the wavelength conversion element through the light guide element. The wavelength conversion element is excited by the excitation light and emits the main light. The emitted main light enters the light splitter and combiner through the light guide element, and is reflected or transmitted through the area outside the target area in the light splitter and combiner.

[0025] The supplementary light generated by the supplementary light source is transmitted or reflected through the target area of ​​the light splitting and combining element, and then combined with the main light before entering the light homogenizing element.

[0026] In some embodiments, when the main light is deflected by the light deflection area after passing through the light guiding element and split into a first beam and a second beam, a first lens corresponding to the first beam and a second lens corresponding to the second beam are also provided between the light guiding element and the light splitting and combining element. The first lens and the second lens are used to focus and collimate the first beam and the second beam, respectively.

[0027] Secondly, this application provides a projection device, including the light combining system described in any one of the first aspects and possible implementations of the first aspect.

[0028] In the light combining system provided in this application, a light deflection zone is set in the light guiding element. When the thickness, refractive index, placement angle of the light deflection zone and the length of the target area of ​​the light splitting and combining element meet specific conditions, the light deflection zone can deflect the light rays that enter it, thereby allowing the light rays to avoid the target area of ​​the light splitting and combining element and enter the subsequent light path, reducing the light loss caused by the target area and improving the light utilization rate. Furthermore, the combination of mixed light sources can increase brightness while miniaturizing the size; therefore, it can improve the brightness of the projection device. Attached Figure Description

[0029] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps. Wherein:

[0030] Figure 1 This is a schematic diagram of the structure of a light guiding element in one embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the optical path of the light beam guided by the light guiding element in one embodiment of this application;

[0032] Figure 3 This is a schematic diagram illustrating the relationship between the light offset region and the target region in one embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the light combining system in one embodiment of this application;

[0034] Figure 5 This is a schematic diagram of the light-combining system in another embodiment of this application;

[0035] Figure 6This is a schematic diagram of the light-combining system in another embodiment of this application;

[0036] Figure 7 This is a schematic diagram of the light-combining system in another embodiment of this application;

[0037] Figure 8 This is a schematic diagram of the projection device in one embodiment of this application. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application. Furthermore, although the disclosure in this application is introduced according to one or several exemplary examples, it should be understood that each aspect of these disclosures can also constitute a complete technical solution on its own. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] In the embodiments of this application, words such as "exemplarily" and "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as an "example" in this application should not be construed as being better or more advantageous than other embodiments or designs. Rather, the use of the word "example" is intended to present the concept in a specific manner.

[0040] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” and similar terms used in this application do not indicate any order, quantity, or importance, but are used solely for distinguishing descriptions. Terms such as “comprising” or “including” mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. The term “and / or” includes any and all combinations of one or more associated listed items.

[0041] To fully understand this application, a detailed description is provided below to illustrate the technical solutions of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0042] This embodiment provides a light combining system, which includes a light source assembly, a light guiding element, a light splitting and combining element, and a light homogenizing element. The light splitting and combining element includes a target region, and the light guiding element includes a light deflection region, wherein:

[0043] Light source components are used to generate main light and supplementary light;

[0044] A light guiding element is used to guide the main light incident into the light guiding element to a light splitting and combining element, wherein the light rays in the main light that are incident into the light deflection area are deflected by the light deflection area, thereby entering a region outside the target region in the light splitting and combining element;

[0045] The beam splitter and combiner is used to combine the main light that enters the beam splitter and combiner from the side of the light guide element with the supplementary light that enters the beam splitter and combiner from the other side and is transmitted or reflected by the target area. The combined light is then injected into the homogenizing element.

[0046] A beam homogenizer is used to homogenize the combined light of the incoming main beam and supplementary beam before it is emitted.

[0047] The light-diffusing element can be a compound eye, a light bar, etc. Optionally, the light combining system may also include a filter element disposed on the incident light side of the light-diffusing element; the filter element can be a filter wheel or a filter sheet, and may include multiple regions, each region for filtering one color of light, for example, it may include three regions: red, green, and blue, filtering red, green, and blue light respectively. Optionally, a focusing and collimating lens group may also be disposed at an appropriate position in the light source system. The focusing and collimating lens group may include one or more lenses, which can be spherical or aspherical mirrors.

[0048] In some embodiments, the shape of the light deflection region is V-shaped or arc-shaped, or the principal light incident surface of the light deflection region is a V-shaped surface or a symmetrical arc surface. For example, as Figure 1 The image shown is a schematic diagram of the structure of a light guiding element provided in an embodiment of this application. Figure 1 The 21 in the text refers to the light offset area; such as Figure 1 The shape of the light offset region shown in (1) is V-shaped. Figure 1 The shape of the light offset area shown in (2) is arc-shaped. Figure 1 The principal incident surface of the light deflection region shown in (3) is a V-shaped surface. Figure 1 The principal incident surface of the light deflection area shown in (4) is a symmetrical arc surface. Appropriate curvature parameters can be set to make the angle at which light rays closer to the center deflect to both sides larger. Optionally, Figure 1 As shown in (5), the light deflection area can also be a region that is tilted relative to the main body of the light guiding element. Alternatively, the light guiding element may only have a light deflection area, such as a light guiding element that is V-shaped.

[0049] Optionally, such as Figure 1 As shown in (1)-(4), the main beam is deflected by the light deflection area after passing through the light guiding element and split into a first beam and a second beam. Optionally, when the main beam is split into a first beam and a second beam after being deflected by the light deflection area after passing through the light guiding element, a first lens corresponding to the first beam and a second lens corresponding to the second beam can be provided between the light guiding element and the beam splitting and combining element. The first lens and the second lens are used to focus and collimate the first beam and the second beam, respectively. For example, as shown in (1)-(4), the main beam is split into a first beam and a second beam. Figure 2 The diagram shown is a schematic of lenses C1 and C2 being set up when the light beam provided in this embodiment is split into two beams by the light guiding element.

[0050] Optionally, the length l of the longer side of the target region satisfies the following formula:

[0051]

[0052] Where θ represents the angle between the normal of the incident surface of the light-deflecting region and the optical axis of the principal beam, h represents the thickness of the light-deflecting region, n represents the refractive index of the light guiding element, and δ represents the angle between the normal of the light-splitting and light-combining element and the optical axis of the principal beam. Figure 3 This diagram illustrates the relationship between the light deflection area and the target area, assuming that the main light beam is incident parallel to the light guiding element. Figure 3 The parameters in the above formula are shown in the figure. When the thickness, refractive index, placement angle of the light deflection zone and the length of the target area of ​​the light splitter and combiner meet the above conditions, the light deflection zone can deflect the light rays that enter it, so that the light rays avoid the target area of ​​the light splitter and combiner and enter the subsequent optical path, reducing the light loss caused by the target area and improving the light utilization rate.

[0053] In some embodiments, such as Figure 4 As shown, the light source assembly includes an excitation light source 01, a wavelength conversion element 02, a beam splitter 03, and a supplementary light source 04. The excitation light generated by the excitation light source 01 passes through the beam splitter 03 and enters the wavelength conversion element 04. The wavelength conversion element 04 is excited by the excitation light and emits a main beam. The emitted main beam passes through the beam splitter 03 and enters the light guiding element 20, then through the light guiding element 20 and into the beam splitting and combining element 30. The main beam is reflected or transmitted through the area outside the target region in the beam splitting and combining element 30. The supplementary light generated by the supplementary light source 04 is transmitted or reflected through the target region of the beam splitting and combining element 30 and combined with the main beam before entering the homogenizing element 50. Optionally, a focusing and collimating lens group can also be provided on the incident side of the homogenizing element, such as... Figure 4 In the lens 40, the light entering the homogenizing element 50 is first focused and collimated by the lens 40 before entering the homogenizing element 50.

[0054] The excitation source can be a blue LED light source, a blue LD light source, a UV light source, etc., and the excitation light can be blue LED light, blue laser light, UV light, etc. The main light can be any one of red light (red laser and / or red LED light), blue light (blue laser and / or blue LED light), green light (blue laser and / or green LED light), yellow light, and cyan light. The beam splitter can have the characteristic of reflecting blue light and / or transmitting red light and green light.

[0055] The supplementary light source can be an LED light source, an LD light source, or a hybrid light source of LD and LED light sources. For example, the supplementary light can be at least one of red laser, green laser, and blue laser, as well as red LED light, green LED light, and blue LED light. Optionally, the supplementary light includes at least one of red light, blue light, and green light. The wavelength ranges of the main light and the supplementary light can be the same or different, but both include wavelengths belonging to the same primary color light, which can be red light, green light, blue light, etc. Optionally, the wavelengths of the main light and the supplementary light overlap at least in a first or second wavelength range, and the overlapping energy accounts for a proportion greater than or equal to a preset proportion of the total energy of the target color light. The first and second wavelength ranges are not limited; for example, the first wavelength range can be 520~530nm, the second wavelength range can be 635~645nm, and the preset proportion can be 80%.

[0056] The wavelength conversion element 02 can be a light source including a wavelength conversion material. The excitation light and the light-emitting unit included in the wavelength conversion element jointly excite the wavelength conversion material to generate main light. The wavelength conversion material can be phosphor, phosphor, etc., such as red phosphor, yellow phosphor, green phosphor, cyan phosphor, etc. Optionally, the wavelength conversion element 02 can include a wavelength conversion region, and the wavelength conversion region can be provided with a wavelength conversion material. The wavelength conversion element 02 can include multiple wavelength conversion regions, for example, wavelength conversion region A is covered with yellow or red phosphor, and wavelength conversion region B is covered with green phosphor.

[0057] For example, the excitation light source 01 can be a blue LED light source, the wavelength conversion element 02 can be a light source covered with green phosphor, the beam splitting element 03 reflects blue light and transmits green light, and the supplementary light source is a three-color LD light source to generate red laser, green laser and blue laser; thus, the combined light source can increase the brightness while miniaturizing the size.

[0058] Optionally, when the supplementary light includes only one of red, blue, and green light, such as Figure 5 As shown, the light source assembly also includes a first light source 05, a second light source 07, a first light combining element 06, and a second light combining element 08; the main light and supplementary light after passing through the light combining element 30 also pass through the first light combining element 06 and the second light combining element 08 before entering the light equalizing element 50.

[0059] The light generated by the first light source 05 is incident on the light-diffusing element 50 via the first light-combining element 06 and the second light-combining element 08; the light generated by the second light source 07 is incident on the light-diffusing element 50 via the second light-combining element 08. The first light source 05 and the second light source 07 can be LED light sources, LD light sources, or a hybrid light source of LD light sources and LED light sources; for example, if the excitation light is blue light, the main light is green light (fluorescence), and the supplementary light is green light, then the first light source 05 and the second light source 07 can generate blue light and red light respectively; if the main light is red light and the supplementary light is red light, then the first light source 05 and the second light source 07 can generate blue light and green light respectively.

[0060] Optionally, the light source assembly also includes a target light source 09. The light generated by the target light source 09 is directed through a beam-splitting element 03 into a light-guiding element 02, then through the light-guiding element 02 into a beam-splitting and beam-combining element 30. The light is then reflected or transmitted through an area outside the target region within the beam-splitting and beam-combining element 30 to a light-uniforming element, such as... Figure 6 As shown. The target light source 09 can be an LED light source, an LD light source, or a hybrid light source of LD and LED light sources; for example, if the excitation light is blue light, the main light is green light or red light (fluorescence), and the supplementary light is green light, red light, and blue light, then the target light source 07 can produce red light or green light.

[0061] In some embodiments, such as Figure 7 As shown, the light source assembly includes an excitation light source 01, a wavelength conversion element 02, and a supplementary light source 03; the excitation light generated by the excitation light source 01 is transmitted or reflected by the target area of ​​the light splitting and combining element 30 ( Figure 7 Taking transmission as an example, the light enters the wavelength conversion element 02 through the light guiding element 30. The wavelength conversion element 02 is excited by the excitation light and emits the main light. The emitted main light enters the beam splitter and combiner element 30 through the light guiding element 20. It is reflected or transmitted through the area outside the target area in the beam splitter and combiner element 30. The supplementary light generated by the supplementary light source 03 is transmitted or reflected through the target area of ​​the beam splitter and combiner element 30 and then combined with the main light before entering the homogenizing element 50. Optionally, the beam combining system may also include a focusing and collimating lens group 40. After beam combining, the light enters the homogenizing element 50 through the focusing and collimating lens group 40.

[0062] Optionally, the wavelength conversion element 02 may also include a reflective region for reflecting the excitation light generated by the excitation source. This reflective region may be any one of a mirror, a polished metal layer or metal plate, a substrate coated with a reflective film, particles with diffuse reflection, or a microstructured reflective layer.

[0063] For example, suppose the excitation source is a blue LD light source and the excitation light is a blue laser; the wavelength conversion element includes wavelength conversion region A and wavelength conversion region B; the supplementary light source is a tri-color LD light source and the supplementary light includes red laser, blue laser and green laser.

[0064] When the beam combining system needs to emit red light, the excitation source 01 generates a blue laser. After being transmitted through the target area of ​​the beam splitter and combiner element 30, it is directed by the light guide element 30 into the wavelength conversion region A of the wavelength conversion element 02. The wavelength conversion region A is excited by the blue laser and emits red light. The emitted red light is split into two beams by the light guide element 20 and enters the beam splitter and combiner element 30. These two beams are reflected by areas outside the target area in the beam splitter and combiner element 30. Simultaneously, the supplementary source 03 generates a red laser, which is transmitted through the target area of ​​the beam splitter and combiner element 30 and combined with the red light before entering the focusing and collimating lens group 40. The focusing and collimating lens group 40 then enters the homogenizing element 50. When the beam combining system needs to generate green light, the same method as generating red light can be used, and will not be repeated here.

[0065] When the light combining system needs to generate blue light, the excitation light source 01 generates a blue laser, which is transmitted through the target area of ​​the beam splitter and combiner element 30, and then enters the reflection area in the wavelength conversion element 02 through the light guiding element 30. The reflection area reflects the blue laser to the light guiding element 20, which splits it into two beams that enter the beam splitter and combiner element 30. These two beams are reflected by areas outside the target area in the beam splitter and combiner element 30. At the same time, the supplementary light source 03 generates a blue laser, which is transmitted through the target area of ​​the beam splitter and combiner element 30 and then combined with the main blue laser before entering the focusing collimating lens group 40. After entering the light homogenizing element 50, the focusing collimating lens group 40 also enters the light homogenizing element 50.

[0066] As can be seen from the above, in the light combining system provided in this embodiment, a light deflection area is provided in the light guiding element. When the thickness, refractive index, placement angle of the light deflection area and the length of the target area of ​​the light splitting and combining element meet specific conditions, the light deflection area can deflect the light entering it, thereby allowing the light to avoid the target area of ​​the light splitting and combining element and enter the subsequent light path, reducing the light loss caused by the target area and improving the light utilization rate. Furthermore, the combination of mixed light sources can increase brightness while miniaturizing the size; therefore, the brightness of the projection device can be improved.

[0067] Figure 8 This is a schematic diagram of the functional modules of a projection device provided in this application. Figure 8 As shown, the projection device includes an image processor 101 and a projection optical engine 102. Wherein:

[0068] The image processor 101 can be a microcontroller, a dedicated image processing chip, etc. The microcontroller can be an ARM chip, a microcontroller unit (MCU), etc.; the dedicated image processing chip can be an image signal processor (ISP), a graphics processing unit (GPU), an embedded neural network processing unit (NPU), etc. The image processor 101 can be used for video decoding, image quality processing, etc.

[0069] The projection optical engine 102 may include a driver chip, a spatial light modulator, and the light combining system described in the above embodiments. The spatial light modulator may be a digital micromirror device (DMD), a liquid crystal display (LCD), or a liquid crystal on silicon (LCOS), etc. The driver chip corresponds to the spatial light modulator; for example, the digital micromirror device may be driven by a digital light processing (DLP) element. The projection optical engine 102 is used to project the image to be projected into a projection screen.

[0070] In some embodiments, the projection device further includes a central controller 103 with one or more processing cores, which may be a CPU, ARM, MCU, or other controller. The central controller 103 is the control center of the projection device, connecting various parts of the entire projection device via various interfaces and lines. It can run or execute software programs and / or operating systems stored in the memory 104, and access data stored in the memory 104. Optionally, the image processor 101 and the central controller 103 may be integrated into a single processor.

[0071] In some embodiments, the projection device further includes a memory 104, an input module 105, a communication module 106, a power supply 107, and other components of one or more computer-readable storage media. Those skilled in the art will understand that... Figure 8 The projection device structure shown does not constitute a limitation on the projection device and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein:

[0072] The memory 104 can be used to store software programs and operating systems. The central controller 103 executes various functional applications and data processing by running the software programs and operating systems stored in the memory 104. The memory 104 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the projection device, etc. In addition, the memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 104 may also include a memory controller to provide the central controller 103 with access to the memory 104.

[0073] The projection device may also include an input module 105, which can be used to receive input digital or character information, and generate remote control, keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0074] The projection device may also include a communication module 106. In some embodiments, the communication module 106 may include a wireless module, through which the projection device can perform short-range wireless transmission, thereby providing users with wireless broadband internet access. For example, the communication module 106 can be used to help users access streaming media.

[0075] The projection device also includes a power supply 107 that supplies power to the various components. In some embodiments, the power supply 107 can be logically connected to the central controller 103 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The power supply 107 may also include one or more DC or AC power supplies, recharging systems, power fault detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0076] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items. The character “ / ” in this document generally indicates that the preceding and following objects are in an “or” relationship.

[0077] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A light-combining system, characterized in that, It includes a light source assembly, a light guiding element, a light splitting and combining element, and a light homogenizing element. The light splitting and combining element includes a target region, and the light guiding element includes a light deflection region, wherein: The light source assembly is used to generate main light and supplementary light; The light guiding element is used to guide the main light incident into the light guiding element to the light splitting and combining element, wherein the light rays in the main light that are incident into the light deflection area are deflected by the light deflection area, thereby entering a region outside the target region in the light splitting and combining element; The beam splitter and beam combiner is used to combine the main light that enters the beam splitter and beam combiner from the side of the light guiding element with the supplementary light that enters the beam splitter and beam combiner from the other side and is transmitted or reflected by the target area, and then the combined light is injected into the light homogenizer. The light-diffusing element is used to homogenize the combined light of the incident main light and supplementary light before it is emitted. The shape of the light deflection area is V-shaped or arc-shaped, or the main light incident surface of the light deflection area is a V-shaped surface or a symmetrical arc surface.

2. The light combining system according to claim 1, characterized in that, The length l of the longer side of the target region satisfies the following formula: Wherein, θ represents the angle between the normal of the incident surface of the light-deflecting region and the optical axis of the principal beam, h represents the thickness of the light-deflecting region, n represents the refractive index of the light guiding element, and δ represents the angle between the normal of the light-splitting and light-combining element and the optical axis of the principal beam.

3. The light combining system according to claim 1, characterized in that, The light source assembly includes an excitation light source, a wavelength conversion element, a beam splitting element, and a supplementary light source; The excitation light generated by the excitation source is directed into the wavelength conversion element through the beam splitter. The wavelength conversion element is excited by the excitation light and emits a main beam. The emitted main beam is directed into the light guiding element through the beam splitter and then into the beam splitter-and-combiner element. The beam is reflected or transmitted through the area outside the target area in the beam splitter-and-combiner element. The supplementary light generated by the supplementary light source is transmitted or reflected through the target area of ​​the light splitting and combining element, and then combined with the main light before entering the light homogenizing element.

4. The light combining system according to claim 3, characterized in that, The supplementary light includes at least one of red light, blue light, and green light.

5. The light combining system according to claim 4, characterized in that, When the supplementary light includes only one of red light, blue light, and green light, the light source assembly further includes a first light source, a second light source, a first light combining element, and a second light combining element; the main light and supplementary light after passing through the light combining element also pass through the first light combining element and the second light combining element before entering the light equalizing element; The light generated by the first light source passes through the first light combining element and the second light combining element and is then incident on the light homogenizing element; The light generated by the second light source is incident on the light-simulating element via the second light-combining element.

6. The light combining system according to claim 3, characterized in that, The light source assembly also includes a target light source. The light generated by the target light source is directed into the light guiding element through the beam splitting element, then into the beam splitting and combining element through the light guiding element, and finally reflected or transmitted to the light homogenizing element through the area outside the target region in the beam splitting and combining element.

7. The light combining system according to claim 1, characterized in that, The light source assembly includes an excitation light source, a wavelength conversion element, and a supplementary light source. The excitation light generated by the excitation source is transmitted or reflected through the target area of ​​the light splitting and combining element, and then enters the wavelength conversion element through the light guiding element. The wavelength conversion element is excited by the excitation light and emits main light. The emitted main light enters the light splitting and combining element through the light guiding element, and is reflected or transmitted through the area outside the target area in the light splitting and combining element. The supplementary light generated by the supplementary light source is transmitted or reflected through the target area of ​​the light splitting and combining element, and then combined with the main light before entering the light homogenizing element.

8. The light combining system according to claim 1, characterized in that, When the main light is deflected by the light deflection area after passing through the light guiding element, it is split into a first beam and a second beam. A first lens corresponding to the first beam and a second lens corresponding to the second beam are also provided between the light guiding element and the beam splitting and combining element. The first lens and the second lens are used to focus and collimate the first beam and the second beam, respectively.

9. A projection device, characterized in that, The light-combining system includes any one of claims 1-8.

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