Light source system and projection device

Abstract

A light source system and a projection device. In the light source system, when a light source (01) and a lens group (03) are off-axis, that is, light generated by the light source (01) is directly incident into the lens group (03) via a light guide element (02) or an avoidance light guide element (02), the optical axis of a light spot and the optical axis of the lens group are spaced apart by a certain distance. After being focused by the lens group, the light serves as excitation light of a wavelength conversion region, so that loss of light of a first color and excited light of a second color on the light guide element (02) may be reduced. Moreover, when the excited light of a second color is finally incident into a light homogenizing element (12), the formed light spot may be oval and corresponds to long and short edges of the light homogenizing element (12), thereby improving the utilization rate of the light, so that the brightness of the projection device may be improved.

Description

Light source system and projection equipment Technical Field

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

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

[0003] In the projection display industry, traditional light bulbs are increasingly being used due to their inherent shortcomings. New light sources such as LEDs, phosphors, and lasers, demonstrating superior characteristics in brightness, color, lifespan, and energy consumption, are gradually becoming the mainstream light sources for projection displays. Lasers offer the advantages of high brightness and high light efficiency, and are often used to excite blue lasers. However, in existing systems, the beam splitter element must be coated with a film that transmits blue light and reflects fluorescence. Furthermore, the thickness of the beam splitter, typically 0.5 to 1.1 mm, absorbs blue light. Ultimately, the coating and absorption cause a 2% to 5% loss in blue laser brightness, resulting in a loss of brightness in the projection light source and reduced light utilization. Furthermore, the focused spot of a blue laser in conventional systems is typically circular, while the spatial light modulator in projection systems is typically rectangular, with an aspect ratio of, for example, 16:9. To match the optical etendue, an elliptical focused spot significantly improves system efficiency.

[0004] Summary of the Invention

[0005] The present application provides a light source system that can be used in a projection device, which can improve light utilization and thus increase the brightness of the projection device.

[0006] In a first aspect, the present application provides a light source system, comprising a light source, a first lens group, a wavelength conversion element, a light guide assembly, and a light homogenizing element, wherein the light guide assembly comprises a light guide element, and the wavelength conversion element comprises a wavelength conversion region and a reflection region;

[0007] The first color light generated by the light source is incident on the first lens group through the light guide element, or the first color light generated by the light source is incident on the first lens group;

[0008] When the first color light is focused by the first lens group and then enters the wavelength conversion zone, the wavelength conversion zone is excited by the first color light to emit the second color light, and the second color light enters the first lens group and then enters the light guide assembly through the first lens group;

[0009] When the first color light is focused by the first lens group and then enters the reflection area, the reflection area reflects the first color light and then enters the light guide assembly through the first lens group;

[0010] The first color light or the second color light incident on the light guiding component is incident on the light homogenizing element through the light guiding component, and is homogenized by the light homogenizing element before being emitted;

[0011] The spot of the second color light emitted by the first lens group is elliptical; the distance between the optical axis of the first color light emitted from the light source to the first lens group and the optical axis of the first lens group is the first distance.

[0012] In some embodiments, a beam reduction lens group is further provided between the light source and the light guide element. The first color light generated by the light source is beam reduced by the beam reduction lens group and then incident on the light guide element.

[0013] In some embodiments, a diffusion element is further provided between the light source and the light guide element, and the first color light generated by the light source is diffused and homogenized by the diffusion element before being incident on the light guide element; wherein the diffusion angle of the diffusion element is a first angle.

[0014] In some embodiments, a stop is provided on the side of the light guide element facing the light source, and the first color light generated by the light source is incident on the light guide element through the stop.

[0015] In some embodiments, the first lens group includes at least one aspherical mirror and at least one spherical mirror; the curvature radius range of one surface of the aspherical mirror is within a first preset radius range, and the curvature coefficient range is within a first preset coefficient range, and the curvature radius of the other surface is within the first preset radius range, and the curvature coefficient range is within a second coefficient range; the curvature radius range of one surface of the spherical mirror is within a second preset radius range, and the curvature radius of the other surface is within a third preset radius range.

[0016] In some embodiments, the light-guiding element includes a target light-transmitting area, and the first color light generated by the light source is transmitted from the target light-transmitting area to the first lens group; wherein the target side length of the target light-transmitting area is determined based on the long side length of the light-guiding element, the first distance and the long axis length of the light spot of the first color light.

[0017] In some embodiments, the distance between the lens closest to the wavelength conversion element in the first lens group and the wavelength conversion element is a second distance;

[0018] and / or, the angle between the light guide element and the wavelength conversion element is a second angle;

[0019] and / or, an angle between a central ray of the first color light emitted from the first lens group toward the wavelength conversion element and a normal line of the wavelength conversion element is greater than or equal to a preset angle;

[0020] And / or, the light guide element includes a target light-transmitting area, and the target light-transmitting area is any one of a through hole, a diffusion area, an anti-reflection area, a polarization splitting area, and a dichroic area.

[0021] In some embodiments, the light guiding assembly includes an adjustable element and a light splitting and combining element;

[0022] In which, the light spot of the first color light and the light spot of the second color light are symmetrically emitted to the light homogenizing element, and the long axis and short axis of the light spot of the second color light and / or the first color light correspond to the long side and short side of the light incident surface of the light homogenizing element respectively; and / or, the distance between the adjustable element and the light guiding element or the light splitting and combining element is the third distance.

[0023] In some embodiments, the light source system further includes a color filter element, and the first color light or the second color light incident on the light guide assembly is incident on the color filter element through the light guide assembly, and then is filtered by the color filter element and then incident on the light homogenizing element; wherein:

[0024] The light guiding assembly includes an adjustable element, a second lens group, a light-splitting and light-combining element, and a third lens group. The light guiding element reflects the first color light and the second color light, and the light-splitting and light-combining element transmits the first color light and reflects the second color light. The second color light enters the light guiding element through the first lens group, is reflected by the light guiding element, is incident on the light-splitting and light-combining element through the second lens group, is reflected by the light-splitting and light-combining element to the third lens group, and is incident on the color filter element through the third lens group. The first color light reflected by the reflection area enters the light guiding element, is reflected by the light guiding element, is incident on the adjustable element through the light-splitting and light-combining element, and is incident on the third lens group through the third lens group.

[0025] Alternatively, the light guiding assembly includes an adjustable element, a second lens group, a light splitting and combining element, and a third lens group; the light guiding element reflects the first color light and the second color light, and the adjustable element transmits the second color light and reflects the first color light; the first color light reflected by the reflection area enters the light guiding element, is reflected by the light guiding element, passes through the second lens group, enters the adjustable element, is reflected by the adjustable element to the third lens group, and enters the color filter element through the third lens group; the second color light enters the light guiding element through the first lens group, is reflected by the light guiding element, passes through the second lens group and the adjustable element, enters the light splitting and combining element, is reflected by the light splitting and combining element to the third lens group, and enters the color filter element through the third lens group;

[0026] Alternatively, the light guide assembly includes an adjustable element and a third lens group, wherein the light guide element transmits a first color light and reflects a second color light; the first color light reflected from the reflective area enters the light guide element, passes through the light guide element, and then enters the adjustable element, is reflected back to the light guide element by the adjustable element, and then passes through the light guide element and the third lens group and enters the color filter element; the second color light enters the light guide element through the first lens group, is reflected by the light guide element, and then passes through the third lens group and enters the color filter element;

[0027] Alternatively, the light guiding assembly includes an adjustable element, a second lens group, a light-splitting and light-combining element, and a third lens group; the light guiding element transmits the first color light and reflects the second color light; the first color light reflected from the reflection area enters the light guiding element, passes through the light guiding element, and then enters the adjustable element, is reflected back to the light guiding element by the adjustable element, passes through the light guiding element and the second lens group, and then enters the light-splitting and light-combining element, and then enters the color filter element through the light-splitting and light-combining element and the third lens group; the second color light enters the light guiding element through the first lens group, is reflected by the light guiding element, passes through the second lens group, and then enters the light-splitting and light-combining element, and then enters the color filter element through the light-splitting and light-combining element and the third lens group;

[0028] Alternatively, the light guiding assembly includes an adjustable element, a second lens group, a light-splitting and light-combining element, and a third lens group; the adjustable element reflects the first color light and transmits the second color light, and the light guiding element reflects the second color light; the first color light reflected by the reflection area enters the adjustable element, is reflected by the adjustable element to the second lens group, enters the light-splitting and light-combining element through the second lens group, and enters the color filtering element through the light-splitting and light-combining element and the third lens group; the second color light enters the adjustable element through the first lens group, passes through the adjustable element, and then enters the light guiding element, is reflected by the light guiding element, enters the second lens group, passes through the second lens group, enters the light-splitting and light-combining element, and then enters the color filtering element through the light-splitting and light-combining element and the third lens group;

[0029] Alternatively, the light guiding assembly includes an adjustable element and a third lens group; the adjustable element reflects a first color light and transmits a second color light, and the light guiding element reflects the second color light; the first color light reflected by the reflective area enters the adjustable element, is reflected by the adjustable element to the third lens group, and then enters the color filter element through the third lens group; the second color light enters the adjustable element through the first lens group, passes through the adjustable element, enters the light guiding element, is reflected by the light guiding element, enters the third lens group, and then enters the color filter element through the third lens group;

[0030] Alternatively, the light guide assembly includes a third lens group, and the light guide element reflects the first color light and the second color light; the first color light reflected by the reflection area enters the light guide element, and after being reflected by the light guide element, it enters the color filter element through the third lens group; the second color light enters the light guide element through the first lens group, and after being reflected by the light guide element, it enters the color filter element through the third lens group.

[0031] In some embodiments, the light source system also includes a supplementary light source assembly, and the light source system includes a light splitting and combining element, which reflects the first color light and the second color light and transmits the supplementary light generated by the supplementary light source; or the light splitting and combining element reflects the second color light and transmits the supplementary light generated by the first color light and the supplementary light source; the adjustable element reflects the first color light and transmits the supplementary light generated by the supplementary light source.

[0032] In some embodiments, the light-splitting and light-combining element includes a supplementary light-transmitting area, which transmits the supplementary light generated by the supplementary light source;

[0033] The supplementary light-transmitting area is any one of a through hole, a diffusion area, an anti-reflection area, a polarization splitting area, and a dichroic area.

[0034] In some embodiments, the supplementary light source assembly includes a first supplementary light source and a second supplementary light source, and the supplementary light includes light generated by a first color light source and light generated by a second color light source;

[0035] The supplementary light-transmitting area includes a first light-transmitting area and a second light-transmitting area. The first light-transmitting area transmits light generated by the first supplementary light source, and the second light-transmitting area transmits light generated by the second supplementary light source.

[0036] In some embodiments, the supplementary light source assembly includes a polarization light combining element, and the supplementary light source assembly includes a first supplementary light source and a second supplementary light source, wherein the first supplementary light source and the second supplementary light source generate light with different polarization states;

[0037] The light with different polarization states generated by the first supplementary light source and the second supplementary light source is combined by the polarization light combining element and then incident on the supplementary light-transmitting area.

[0038] In some embodiments, the supplementary light-transmitting region reflects light of a first polarization state and transmits light of a second polarization state, the supplementary light includes target light that can excite the wavelength conversion region to generate second color light, and the target light is light of the first polarization state; the light source system further includes a color filter element, the color filter element includes a region that can reflect the target light, and a phase conversion element is provided between the color filter element and the light splitting and combining element;

[0039] When the first color light is focused by the first lens group and enters the wavelength conversion area, the target light passes through the supplementary light-transmitting area and the phase conversion element and enters the color filter element. After being reflected by the color filter element, it is again converted into light of the second polarization state by the phase conversion element and enters the supplementary light-transmitting area. After being reflected by the supplementary light-transmitting area, it finally enters the wavelength conversion area.

[0040] In some embodiments, the light source system also includes a supplementary light source assembly, and the wavelength conversion element includes a transmission area; the supplementary light generated by the supplementary light source assembly is incident on the first lens group through the transmission area of ​​the wavelength conversion element, and then is incident on the light guide assembly through the first lens group, and then is incident on the light homogenizing element through the light guide assembly, and then is homogenized by the light homogenizing element and then emitted.

[0041] In some embodiments, the light source system further includes a supplementary light source assembly, and the supplementary light generated by the supplementary light source assembly is incident upon the light guiding assembly through the light guiding assembly, and then incident upon the light homogenizing assembly through the light guiding assembly, and then emitted after being homogenized by the light homogenizing assembly.

[0042] In a second aspect, the present application provides a projection device, comprising the light source system according to any one of the first aspect and possible implementations of the first aspect.

[0043] In the light source system provided in the present application, the light source and the lens group are off-axis, that is, when the first color light generated by the light source passes through the light-guiding element or avoids the light-guiding element and directly enters the lens group, the optical axis of the light spot is at a certain distance from the optical axis of the lens group. After being focused by the lens group, it serves as the excitation light of the wavelength conversion zone, which can reduce the loss of the first color light and the excited second color light on the light-guiding element; and can make the light spot formed by the excited second color light when it finally enters the light-homogenizing element be elliptical, corresponding to the long and short sides of the light-homogenizing element, thereby improving the utilization rate of light. In addition, a diffusion element can be set before the light source enters the wavelength conversion zone, which can reduce the energy density of light on the wavelength conversion zone and improve the excitation efficiency of the wavelength conversion material; the light guide element can be provided with a through hole, and the first color light enters the lens group through the through hole, which can reduce the loss of the first color light during penetration; at the same time, by setting a focus lens group before the light source enters the light guide element, the area of ​​the through hole can be made smaller, so that the overlapping area between the through hole and the light spot of the second color light is smaller, and the loss of the second color light is less; the light source system of the above embodiment can improve the utilization rate of light, thereby improving the brightness of the projection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and other purposes, features and advantages of the present application will become more apparent by describing the embodiments of the present application in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps. Among them:

[0045] FIG1 is a schematic structural diagram of a light source system in one embodiment of the present application;

[0046] FIG2 is a schematic structural diagram of a light guide element in an embodiment of the present application;

[0047] FIG3 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0048] FIG4 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0049] FIG5 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0050] FIG6 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0051] FIG7 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0052] FIG8 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0053] FIG9 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0054] FIG10 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0055] FIG11 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0056] FIG12 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0057] FIG13 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0058] FIG14 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0059] FIG15 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0060] FIG16 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0061] FIG17 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0062] FIG18 is a schematic structural diagram of a light source system in another embodiment of the present application;

[0063] FIG19 is a schematic structural diagram of a projection device in one embodiment of the present application. DETAILED DESCRIPTION

[0064] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application. In addition, although the disclosure in the present 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 separately. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0065] In the embodiments of this application, words such as "exemplarily" and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0066] Unless otherwise defined, the technical or scientific terms used in this application should have the usual meaning understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish descriptions. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The term "and / or" includes any and all combinations of one or more associated listed items.

[0067] In order to fully understand the present application, a detailed description will be provided below to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may also have other implementation methods.

[0068] This embodiment provides a light source system, as shown in Figure 1, which includes a light source 01, a first lens group 03, a wavelength conversion element 04, a light guiding component and a light homogenizing element 12. The light guiding component includes a light guiding element 02, and the wavelength conversion element 04 includes a wavelength conversion area and a reflection area.

[0069] The first color light generated by light source 01 is incident on first lens group 03 via light guide element 02, or the first color light generated by light source 01 is incident on first lens group 03. After being focused by first lens group 03, the first color light is incident on the wavelength conversion region. The wavelength conversion region is excited by the first color light to emit second color light. The second color light is incident on first lens group 03 and then, through first lens group 03, is incident on the light guiding assembly. After being focused by first lens group 03, the first color light is incident on the reflection region. The reflection region reflects the first color light and, through first lens group 03, is incident on the light guiding assembly.

[0070] The first color light or the second color light incident on the light guide assembly is incident on the light homogenizing element 12 through the light guide assembly, and is homogenized by the light homogenizing element 12 before being emitted. Optionally, the light source system further includes a color filter element 11, and the first color light or the second color light incident on the light guide assembly is incident on the color filter element 11 through the light guide assembly, and is filtered by the color filter element 11 before being incident on the light homogenizing element 12.

[0071] The spot of the second color light emitted by the first lens group is elliptical; the distance between the optical axis of the first color light emitted from the light source 01 to the first lens group and the optical axis of the first lens group is the first distance.

[0072] Optionally, if the first lens group includes a first lens and a second lens, the first distance L1 satisfies the following formula:

[0073] Where n1 represents the refractive index of the first lens, r 11 represents the radius of curvature of the first surface of the first lens, r 12 represents the radius of curvature of the second surface of the first lens, d1 represents the center thickness of the first lens; n2 represents the refractive index of the second lens, r 21 represents the radius of curvature of the first surface of the second lens, r 22 represents the radius of curvature of the second surface of the second lens, d2 represents the center thickness of the second lens, and D represents the distance between the first lens and the second lens. For example, the value of the first distance can be in the range of 2 to 12 mm. Optionally, the angle between the first color light and the normal of the wavelength conversion element ranges from 25 to 75 degrees.

[0074] There are no restrictions on light source 01 and the first color light. They can be LED light sources, laser LD light sources, other new light sources, or a combination of LED and laser LD light sources. There is no restriction on the number of light-emitting chips in light source 01. It can be a single chip or an array of light-emitting chips. For example, light source 01 can be an LD light source that produces blue laser light, and the first color light can be blue laser light, UV light, etc.

[0075] The wavelength conversion region contains a wavelength conversion material, which can be a phosphor or phosphor powder. For example, it can include a yellow phosphor that emits yellow light when excited, such as an yttrium aluminum garnet (YAG)-based phosphor containing cerium (Ce) as an activator. Alternatively, it can include a green phosphor, red phosphor, or cyan phosphor. The wavelength conversion region can include at least one subregion, each corresponding to a wavelength conversion material. The wavelength conversion region can generate at least one color light with a wavelength band different from the first color light. Specifically, the second color light includes at least one color light with a wavelength band different from the first color light. For example, the second color light can be at least one of red, green, yellow, and blue light.

[0076] The reflective region has the property of reflecting all light and can be, for example, any of a reflective mirror, a polished metal layer or plate, a reflective film coated on a substrate, diffusely reflective particles, or a microstructured reflective layer. Optionally, the reflective surface of the reflective region and the wavelength conversion region are substantially coplanar.

[0077] The color filter element can be a filter wheel, comprising multiple filter zones, each filtering the first color light, the second color light, and the supplemental light. For example, the color filter element includes filter zones for filtering blue light, red light, and green light. The color filter element can have a dichroic coating on one side and a diffuser on the other side, or it can have a two-layer structure, with one diffuser and one filter. The color filter element 11 and the wavelength conversion element 04 can be driven by the same drive device, or they can be driven by different drives. The light homogenizing element can be a compound eye or a light rod, etc.

[0078] Optionally, the first lens group 03 includes at least one aspherical mirror and at least one spherical mirror; the curvature radius of one surface of the aspherical mirror is within a first preset radius range, the curvature coefficient range is within a first preset coefficient range, and the curvature radius of the other surface is within a first preset radius range, and the curvature coefficient range is within a second coefficient range; the curvature radius of one surface of the spherical mirror is within a second preset radius range, and the curvature radius of the other surface is within a third preset radius range. The first preset radius range, the second preset radius range, the third preset radius range, the first preset coefficient range, and the second coefficient range are not limited and can be customized according to actual application conditions. For example, the curvature radius of one surface of the aspherical mirror is within a range of 15mm to 30mm, the curvature coefficient range is within a range of 1 to 2, the curvature radius of the other surface is within a range of 15mm to 30mm, and the curvature coefficient range is within a range of 0.3 to 1; the curvature radius of one surface of the spherical mirror is within a range of 10mm to 20mm, and the curvature radius of the other surface is greater than or equal to 150. For example, the curvature radius of one surface of an aspheric mirror ranges from -30mm to 30mm, the curvature coefficient ranges from -20 to 20, and the curvature radius of the other surface ranges from -30mm to 30mm, and the curvature coefficient ranges from -10 to 10; the curvature radius of one surface of a spherical mirror ranges from 10mm to 20mm, and the curvature radius of the other surface is greater than or equal to 100. As shown in Figure 1, C1 can be a spherical mirror and C2 an aspheric mirror, or C2 can be a spherical mirror and C1 an aspheric mirror. By properly setting the curvature parameters of the lens group (curvature radius and curvature coefficient, etc.), the spot of the generated second color light can be made elliptical, which better matches the shape of the subsequent light homogenizing element and can improve light utilization.

[0079] Optionally, the distance between the lens closest to the wavelength conversion element 04 in the first lens group 03 and the wavelength conversion element 04 is the second distance; the second distance is not limited and can be customized according to actual application conditions; for example, the value of the second distance can be in the range of 0.5 to 1.5 mm, as shown in Figure 1, the distance between the surface of lens C1 and the surface of the wavelength conversion element 04 facing the lens C1 is within 0.5 to 1.5 mm.

[0080] Optionally, the angle between the central ray of the first color light emitted from the first lens group 03 to the wavelength conversion element 04 and the normal of the wavelength conversion element is greater than or equal to a preset angle. The preset angle is not limited and can be determined based on the first distance and the curvature parameter of the first lens group; for example, it can be 51 degrees. Optionally, the angle between the first color light and the normal of the wavelength conversion element ranges from 25 to 75 degrees. By adopting a suitable angle of incidence on the wavelength conversion element, when the first color light reflected by the reflection area is incident on the uniform light element after passing through the first lens group, the light guide component, etc., the light spot is symmetrical when it enters the uniform light element, which can improve the utilization rate of light.

[0081] In some embodiments, the light guide element 02 includes a target light-transmitting area, and the first color light generated by the light source 01 is transmitted from the target light-transmitting area to the first lens group 03 .

[0082] Optionally, the overlapping area between the target light-transmitting area and the spot area formed by the second color light on the light guide element is less than or equal to a preset ratio of the area of ​​the target light-transmitting area. The preset ratio is not limited and can be customized according to actual application conditions, for example, within a range of 0 to 10%. The shape of the target light-transmitting area is not limited and can be rectangular, circular, elliptical, etc.

[0083] Optionally, the target side length of the target light-transmitting area is determined based on the long side length of the light guide element, the first distance, and the long axis length of the light spot of the first color light, wherein the target side may be a side parallel to the long axis of the second color light or the long side of the light guide element.

[0084] Optionally, the target side length L of the target light-transmitting area satisfies the following formula:

[0085] Wherein, D1 represents the length of the long side of the light guide element, L1 represents the first distance, D2 represents the long axis length of the light spot of the first color light emitted from the light source to the light guide element, and θ represents the angle formed between the light guide element and the optical axis of the first lens group.

[0086] Optionally, D3sinα≤L2sinβ, where L2 can be the long axis length of the spatial light modulator in the projection optical machine shown in Figure 19, D3 represents the long axis length of the light spot of the stimulated light emitted by the first lens group, α is the divergence angle of the light spot before the second color light enters the light guide element, and β is the angle corresponding to the illumination F number (the angle of the light entering the spatial light modulator).

[0087] For example, the size of the target light-transmitting area may be in the range of 11 mm*15 mm to 9.4 mm*4.5 mm, that is, the length of the target side is in the range of 9.4 mm to 15 mm.

[0088] Optionally, the target light-transmitting area can be any one of a through hole, a diffusion area, an anti-reflection area, a polarization splitting area, and a dichroic area; the diffusion area can be a diffuser, the anti-reflection area can be a transparent substrate coated with an anti-reflection film, the polarization splitting area can be a transparent substrate coated with a polarization splitting film (such as reflecting or transmitting S light, transmitting or reflecting P light) or a polarization splitter; the dichroic area can also be a transparent substrate coated with a dichroic film, the dichroic film transmits the first color light and reflects the second color light, for example, the dichroic film transmits blue light and reflects red and green light, and can reflect a wavelength range of at least 500 to 680 nm and a transmission wavelength range of at least 440 to 470 nm. As shown in (2) in Figure 2, E represents the spot area formed by the second color light on the light guide element, and D represents the target light-transmitting area. Optionally, the target light-transmitting area can be located at either end of the light guide element. The target light-transmitting area is a through hole, which can ensure that the first color light has no loss or less loss when passing through the light guide element.

[0089] Optionally, the spot size of the first color light after reflection from the reflection area is greater than or equal to the spot size of the first color light when it passes through the target light-transmitting area; that is, the spot size of the first color light when it passes through the target light-transmitting area is as small as possible, which can reduce the size of the target light-transmitting area, thereby further reducing the loss of the second color light on the light-guiding element.

[0090] Alternatively, the first color light generated by light source 01 can bypass light guide element 02 and enter the first lens group directly from the side of light guide element 02, thereby reducing the loss of the first color light in the light guide element. Alternatively, light guide element 02 can be an element with an L-shaped end, and the first color light can enter the first lens group from the L-shaped end.

[0091] Optionally, the angle between the light guide element 02 and the wavelength conversion element 04 is a second angle. The second angle can be customized based on actual application conditions, for example, the second angle can be within a range of 30 to 45 degrees. For example, if the light guide element is set at 45 degrees relative to the horizontal, the wavelength conversion element can be tilted at an angle between 0 and 15 degrees relative to the horizontal, thereby ensuring that the angle between the light guide element 02 and the wavelength conversion element 04 is within a range of 30 to 45 degrees.

[0092] In some embodiments, as shown in FIG1 , a focusing lens assembly 05 is further disposed between light source 01 and light guide element 02. The first color light generated by light source 01 is focused by focusing lens assembly 05 and then incident on light guide element 02. The focusing lens assembly minimizes the size of the light spot incident on the light guide element, thereby reducing the loss of the second color light incident on the light guide element in the target light transmission area and improving light utilization. Optionally, the focusing lens assembly may also include a collimating lens, or the focusing lens assembly may be replaced by a collimating lens; or it may also be a beam expanding lens assembly.

[0093] In some embodiments, as shown in FIG1 , a diffusion element 06 is further provided between the light source and the light-guiding element. The first color light generated by the light source or the first color light after being narrowed is diffused and homogenized by the diffusion element 06 and then incident on the light-guiding element; wherein the diffusion angle of the diffusion element is the first angle, and the diffusion angle may refer to the diffusion half angle or the diffusion full angle; the first angle may be customized according to the actual application, for example, the value of the diffusion full angle may be 3 to 6 degrees. Optionally, the distance between the diffusion element and the light-guiding element is less than the target distance, and the target distance may be customized according to the actual application, that is, the distance between the diffusion element and the light-guiding element is as short as possible. The diffused first color light is incident on the wavelength conversion zone, reducing the energy density incident on the wavelength conversion zone, and improving the excitation efficiency of the wavelength conversion zone; for example, making the energy density less than or equal to 150W / mm 2 Optionally, the positions of the diffusion element and the beam reducing lens group can also be swapped, that is, the first color light first passes through the diffusion element and then through the beam reducing lens group. Optionally, the beam reducing lens group can also be replaced with a beam expanding lens group, and after being expanded by the beam expanding lens group and diffused by the diffusion element, the light is then incident on the light guiding element through the aperture.

[0094] In some embodiments, an aperture is provided on the light source-facing side of the light guide element 02. The first color light generated by the light source, the diffused and homogenized first color light, or the focused first color light enters the light guide element through the aperture. The aperture prevents the first color light from entering areas outside the target light transmission zone, reducing first color light loss and effectively improving light utilization. Furthermore, the first color light is directed to the wavelength conversion zone via the first focusing lens assembly, resulting in a lower energy density and improved excitation efficiency in the wavelength conversion zone.

[0095] Optionally, the second color light emitted through the first lens group is an elliptical spot, which is determined by factors such as the curvature parameters of the first lens group, the spot size of the first color light, the off-axis degree (the first distance between the optical axis of the first color light and the optical axis of the first lens group), and the diffusion angle of the diffusion element.

[0096] In some embodiments, the light guiding component includes an adjustable element 07 and a light splitting and combining element 09; wherein the light spot of the first color light and the light spot of the second color light are both symmetrically directed toward the light homogenizing element, and the long axis and short axis of the light spot of the second color light and / or the first color light correspond to the long side and short side of the light incident surface of the light homogenizing element, respectively; for example, when directed toward the light homogenizing element, the light axis of the light spot of the first color light and the light spot of the second color light coincide with the central axis of the light incident surface of the light homogenizing element, that is, the center of the light spot is equidistant from either end of the long axis of the light homogenizing element and is equidistant from either end of the short axis, and the first color light and the second color light are coaxially or near-axially incident on the light homogenizing element. For example, when the light homogenizing element is a light rod, the long axis and short axis of the light spot of the second color light and / or the first color light correspond to the long side and short side of the light rod; or, when the light homogenizing element is a compound eye, the long axis and short axis of the light spot of the second color light and / or the first color light correspond to the long side and short side of each small unit cell of the compound eye. Thus, the shape of the light spot can be made elliptical, which better matches the shape of the light homogenizing element and is symmetrically incident on the light homogenizing element; thereby better matching the spatial light modulator in the projection optical machine and achieving higher light utilization.

[0097] Optionally, the distance between the adjustable element and the light-guiding element or the light-splitting and light-combining element is a third distance; the third distance can be customized according to the actual application situation, for example, the value of the third distance is in the range of 3 to 10 mm. Optionally, the angle between the adjustable element and / or the light-splitting and light-combining element and the horizontal line can be between 40 and 50 degrees, or the angle between the adjustable element and the optical axis of the first color light emitted from the light-guiding element is between 40 and 50 degrees. The angle and position between the adjustable element and the light-guiding element or the light-splitting and light-combining element affect whether the first color light and the second color light can be coaxially or near-axially incident on the uniform light element.

[0098] In some embodiments, as shown in FIG1 , the light guiding assembly includes an adjustable element, a second lens group 08, a light-splitting and light-combining element 09, and a third lens group 10. The color filter element 11 and the wavelength conversion element 04 share a driving device. The light guiding element 02 reflects the first color light and the second color light; the adjustable element 07 reflects the first color light, and the adjustable element 07 can be a reflector or a reflective diffuser; the light-splitting and light-combining element 09 transmits the first color light and reflects the second color light. For example, the light guiding element 02 reflects blue light, red light, and green light, and the light guiding element 02 can be a reflector or a reflective diffuser with a target light transmission area; the light-splitting and light-combining element 09 reflects red and green light and transmits blue light; the transmission wavelength range is at least 450 to 470 nm, and the reflection wavelength range is at least 510 to 680 nm; the adjustable element 07 reflects blue light. Optionally, the distance between the adjustable element and the light-splitting and light-combining element is a third distance.

[0099] The second color light enters the light-guiding element 02 through the first lens group 03, is reflected by the light-guiding element 02, passes through the second lens group 08 and enters the light-splitting and combining element 09, is reflected by the light-splitting and combining element 09 to the third lens group 10, and enters the color filter element 11 through the third lens group 10; the first color light reflected by the reflection area enters the light-guiding element 02, is reflected by the light-guiding element 02, passes through the second lens group 08 and the light-splitting and combining element 09 and enters the adjustable element 07, is reflected by the adjustable element 07, passes through the light-splitting and combining element 09 and enters the third lens group 10, and enters the color filter element 11 through the third lens group 10.

[0100] In some embodiments, as shown in FIG3 , the light guiding assembly includes a second lens group 08 , a light splitting and combining element 09 , and a third lens group 10 . The color filter element 11 and the wavelength conversion element 04 share a driving device. The light guiding element 02 transmits the first color light and reflects the second color light. For example, the light guiding element transmits blue light and reflects red and green light. The reflection band can include at least 500 to 680 nm, and the transmission band can include at least 440 to 470 nm. The number, curvature radius, curvature coefficient, etc. of the lenses in the second lens group and the third lens group can be customized according to the actual application. For example, they can all be spherical mirrors. The adjustable element 07 can be a reflector or a reflective diffuser. The light splitting and combining element 09 reflects the first color light and the second color light.

[0101] The first color light reflected from the reflection area enters the light-guiding element 02, passes through the light-guiding element 02 and then enters the adjustable element 07, is reflected back to the light-guiding element 02 by the adjustable element 07, passes through the light-guiding element 02 and the second lens group 08 and enters the light-splitting and light-combining element 09, and then enters the color filter element 11 by the light-splitting and light-combining element 09 and the third lens group 10; the second color light enters the light-guiding element 02 by the first lens group 03, is reflected by the light-guiding element 02, passes through the second lens group 08 and then enters the light-splitting and light-combining element 09, and then enters the color filter element 11 by the light-splitting and light-combining element 09 and the third lens group 10.

[0102] Optionally, light guide element 02 includes region A, region B, region C, and a target light transmission region D. Regions A and B transmit the first color light and reflect the second color light; region C is a reflector or a reflective film, which can enhance the reflection of the second color light and reduce light loss; target light transmission region D is similar to the above description and will not be repeated here. For example, as shown in (1) in Figure 2, the first color light can be transmitted from region A to the adjustable element 07, and the first color light reflected from the adjustable element 07 back to the light guide element 02 is transmitted from region B to the second lens group 08.

[0103] Optionally, as shown in FIG4 , the second lens group may not be provided, and in this case the third lens group includes at least one aspherical lens; the rest may be referred to as shown in FIG3 , which will not be described in detail here.

[0104] In some embodiments, as shown in Figure 5, the light guiding assembly includes a third lens group 10. A light guide element 02 transmits a first color light and reflects a second color light. The color filter element 11 and the wavelength conversion element 04 utilize different drive mechanisms. The first color light reflected from the reflective area enters the light guide element 02, passes through the light guide element, and then enters the adjustable element 07. After being reflected back from the adjustable element 07, the light passes through the light guide element 02 and the third lens group 10 and enters the color filter 11. The second color light enters the light guide element 02 through the first lens group 03, is reflected by the light guide element 02, and then passes through the third lens group 10 and enters the color filter 11. The adjustable element 07 may be a reflector or a reflective diffuser. Optionally, the third lens group 10 includes at least one aspherical mirror.

[0105] In some embodiments, as shown in FIG6 , the light guiding assembly includes a second lens group 08, a light splitting and combining element 09, and a third lens group 10. The color filter element 11 and the wavelength conversion element 04 share a driving device. The light guiding element 02 reflects the first color light and the second color light, and the adjustable element 07 transmits the second color light and reflects the first color light. For example, the light guiding element 02 reflects blue light, red light, and green light. The adjustable element transmits red and green light and reflects blue light. The reflection wavelength range is at least 450 to 470 nm and the transmission wavelength range is at least 510 to 680 nm. The light guiding element 02 can be a reflector or a reflective diffuser with a target light transmission area. Optionally, the distance between the adjustable element and the light splitting and combining element is a third distance.

[0106] The first color light reflected from the reflection area enters the light-guiding element 02, and after being reflected by the light-guiding element 02, passes through the second lens group 08 and enters the adjustable element 07, is reflected by the adjustable element 07 to the third lens group 10, and enters the color filter element 11 through the third lens group 10; the second color light enters the light-guiding element 02 through the first lens group 03, and after being reflected by the light-guiding element 02, passes through the second lens group 08 and the adjustable element 07 and enters the light-splitting and light-combining element 09, is reflected by the light-splitting and light-combining element 09 to the third lens group 10, and enters the color filter element 11 through the third lens group 10.

[0107] In some embodiments, as shown in FIG7 , the light guiding assembly includes a third lens group 10. Light guide element 02 reflects first and second color light. The first color light reflected from the reflective area enters light guide element 02, is reflected by light guide element 02, and then passes through third lens group 10 to enter color filter element 11. The second color light enters light guide element 02 through first lens group 03, is reflected by light guide element 02, and then passes through third lens group 10 to enter color filter element 11. In this case, the light homogenizing element may be a compound eye.

[0108] In some embodiments, as shown in Figure 8, the light guiding component includes an adjustable element 07, a second lens group 08, a light splitting and combining element 09 and a third lens group 10; the adjustable element 07 reflects the first color light and transmits the second color light, and the light guiding element 02 reflects the second color light, such as the adjustable element 07 reflects blue light and transmits red light and / or green light; the light guiding element 02 reflects blue light and can be a reflector or a reflective diffuser with a target light transmission area; the color filter element and the wavelength conversion element use the same driving device; the light guiding element and the adjustable element are set to a non-parallel state; for example, the light guiding element is set to 45 degrees relative to the horizontal line, and the adjustable element is set to a non-45 degree relative to the horizontal line.

[0109] The first color light reflected by the reflection area enters the adjustable element 02, is reflected by the adjustable element 02 to the second lens group 08, enters the light-splitting and light-combining element 09 through the second lens group 08, and enters the color filter element 11 through the light-splitting and light-combining element 09 and the third lens group 10; the second color light enters the adjustable element 07 through the first lens group 03, enters the light-guiding element 02 after passing through the adjustable element 07, enters the second lens group 08 after being reflected by the light-guiding element 02, enters the light-splitting and light-combining element 09 through the second lens group 08, and enters the color filter element 11 through the light-splitting and light-combining element 09 and the third lens group 10.

[0110] In some embodiments, as shown in Figure 9, the light guiding assembly includes an adjustable element 07 and a third lens group 10; the adjustable element 07 reflects the first color light and transmits the second color light, the light guiding element 02 reflects the second color light, and the color filter element and the wavelength conversion element use different driving devices; the light guiding element 02 and the adjustable element 07 can be described with reference to Figure 8.

[0111] The first color light reflected by the reflective area enters the adjustable element 07, is reflected by the adjustable element 07 to the third lens group 10, and then enters the color filter element 11 through the third lens group 10; the second color light enters the adjustable element 07 through the first lens group 03, passes through the adjustable element 07, and then enters the light guide element 02. After being reflected by the light guide element 02, it enters the third lens group 10, and then enters the color filter element 11 through the third lens group 10.

[0112] Optionally, one or more of the adjustable element 07, the light-guiding element 02, and the light-splitting and combining element 09 may be elements having a certain curvature. This curvature is set so that the first color light and the second color light incident on the light-homogenizing element are coaxial. In this case, the second lens group and / or the third lens group may not be provided. For example, if the adjustable element 07 shown in FIG3 is a reflector having a certain curvature, the second lens group and / or the third lens group may not be provided. The first color light reflected by the adjustable element 07 and the second color light reflected by the light-guiding element 02 can be coaxial and ultimately incident on the light-homogenizing element.

[0113] In some embodiments, the light source system further includes a supplemental light source assembly 13. The supplemental light generated by the supplemental light source assembly 13 can be emitted through a light guide element, then into a light homogenizing element, and then emitted after homogenization by the light homogenizing element. This can increase the color gamut and brightness of the light source system. Alternatively, the supplemental light can be emitted into the light guide assembly through a target light-transmitting area of ​​the light guide element, or the light guide assembly can transmit the supplemental light.

[0114] The supplementary light source assembly 13 may include at least one supplementary light source, which may be an LED light source or a LD light source. Each light source may include a single light-emitting chip or an array of light-emitting chips. The supplementary light includes supplementary light of at least one wavelength band. The polarization state of the supplementary light is not limited and may be P or S, or both. Optionally, the supplementary light source assembly 13 includes an LD light source or an LED light source that generates at least one of red, green, and blue light. The supplementary light may be at least one of red laser, green laser, and blue laser, or LED light, green LED light, and blue LED light. For example, the supplementary light source assembly 13 includes an LD light source that generates red laser, and the supplementary light may be red laser. Optionally, the supplementary light source assembly 13 includes a mixed light source of LED and LD light sources. The supplementary light may be at least two of red laser, green laser, and blue laser, or LED light, green LED light, and blue LED light. Optionally, a focusing collimating lens group may also be adaptively provided in the supplementary light source assembly 13.

[0115] As shown in Figure 10, the supplementary light source assembly 13 includes a supplementary light source 131. The supplementary light generated by the supplementary light source 131 can be incident on the third lens group 10 through the target light-transmitting area of ​​the light-guiding element 02, and then incident on the color filter element 11 through the third lens group 10. After being filtered by the color filter element 11, it is incident on the light homogenizing element 12, and then emitted after being homogenized by the light homogenizing element 12.

[0116] In some embodiments, the wavelength conversion element includes a transmission area, and the supplemental light generated by the supplemental light source assembly 13 is incident on the first lens group through the transmission area of ​​the wavelength conversion element, is incident on the light guide assembly through the first lens group, is incident on the light homogenizing element through the light guide assembly, and is homogenized by the light homogenizing element before being emitted. The transmission area can be any one of a through hole, a transparent substrate (such as white glass), a diffusion area, and an anti-reflection area; the diffusion area can be a diffuser, and the anti-reflection area can be a transparent substrate coated with an anti-reflection film. Optionally, the supplemental light generated by the supplemental light source assembly 13 can also be incorporated into the light path of the light source system through the side of one end of the wavelength conversion element, without passing through the wavelength conversion element.

[0117] As shown in Figure 11, the supplementary light source assembly 13 includes a supplementary light source 131, the adjustable element 07 transmits the second color light and the supplementary light and reflects the first color light, and the light guide element 02 reflects the second color light and the supplementary light. For example, the second color light is green light and / or red light, and the supplementary light is red laser and / or green laser. The supplementary light generated by the supplementary light source 131 can be incident on the first lens group 03 through the transmission area of ​​the wavelength conversion element 04; after passing through the first lens group 03 and the adjustable element 07, it is incident on the light guide element 02, and after being reflected by the light guide element 02, it is incident on the color filter element 11 through the third lens group 10, and after being filtered by the color filter element 11, it is incident on the light homogenizing element 12, and is emitted after being homogenized by the light homogenizing element 12.

[0118] In some embodiments, as shown in FIG12 , the supplemental light source assembly 13 includes a first supplemental light source 131 and a second supplemental light source 132 . The supplemental light generated by the first supplemental light source 131 can be incident on the first lens group 03 through the transmission area of ​​the wavelength conversion element 04 . After passing through the first lens group 03 and the adjustable element 07 , it can be incident on the light guide element 02 . After being reflected by the light guide element 02 , it can be incident on the third lens group 10 . The supplemental light generated by the second supplemental light source 132 can be incident on the light guide element 02 , and then be incident on the third lens group 10 . The supplemental light incident on the third lens group 10 can then be incident on the color filter element 11 through the third lens group 10 . After being filtered by the color filter element 11 , it can be incident on the light homogenizing element 12 . After being homogenized by the light homogenizing element 12 , it can be emitted. For example, the first supplemental light source 131 is a red laser light source, and the second supplemental light source 132 is a red LED light source. The red laser and red LED light can have different wavelength bands, and the light guide element 02 can combine the light by wavelength. Alternatively, the light guide element 02 includes a target area that reflects the red laser light. In this case, the wavelength conversion element may include only a wavelength conversion region that generates green light.

[0119] In some embodiments, the light source system includes a light-splitting and light-combining element, which reflects the first color light and the second color light and transmits the supplementary light generated by the supplementary light source; or the light-splitting and light-combining element reflects the second color light and transmits the supplementary light generated by the first color light and the supplementary light source; the adjustable element reflects the first color light and transmits the supplementary light generated by the supplementary light source. Optionally, the light-splitting and light-combining element can be arranged between the color filter element and the light guide element. The supplementary light enters the color filter element through the light-splitting and light-combining element and the third lens group, is filtered by the color filter element, and then enters the light homogenizing element, and is homogenized by the light homogenizing element before being emitted.

[0120] Optionally, the light-splitting and light-combining element can have dichroic properties, such as by being coated with a dichroic film, so that the light-splitting and light-combining element reflects the first color light and the second color light and transmits the supplemental light generated by the supplemental light source. For example, if the wavelength conversion region is excited to generate green light, and the supplemental light source assembly 13 generates red laser light, the light-splitting and light-combining element can reflect blue and green light and / or red light (fluorescence) and transmit the red laser light, with the reflection band at least including 420 to 620 nm and the transmission band at least including 635 to 680 nm.

[0121] Optionally, the light-splitting and light-combining element includes a supplementary light-transmitting region that transmits supplementary light generated by the supplementary light source. The supplementary light-transmitting region can be any one of a through hole, a diffusion region, an anti-reflection region, a polarization-splitting region, and a dichroic region. The diffusion region can be a diffuser, the anti-reflection region can be a transparent substrate coated with an anti-reflection film, and the polarization-splitting region can be a transparent substrate coated with a polarization-splitting film (e.g., reflecting or transmitting S light, transmitting or reflecting P light). The supplementary light-transmitting region can also be a transparent substrate coated with a dichroic film, which reflects the first color light and the second color light and transmits the supplementary light. For example, as shown in FIG13 , assuming that the wavelength conversion region is excited to generate green and red light, and the supplementary light generated by the supplementary light source 131 is red laser light, the light-splitting and light-combining element reflects red, blue, and green light, and the supplementary red laser light is transmitted through the supplementary light-transmitting region. The supplementary light-transmitting region can be a diffuser, a through hole, a transparent substrate coated with an anti-reflection film, etc. The size of the supplementary light-transmitting region is not limited, for example, the size is within the range of 8 mm * 8 mm, such as 5.5 mm * 3.6 mm. Optionally, the light source assembly further includes a focusing and collimating lens group 134 corresponding to the supplementary light source.

[0122] Optionally, as shown in Figure 14, the adjustable element 07 can have a dichroic property, reflecting the first color light and transmitting the supplementary light, for example, reflecting the blue laser and transmitting the red laser and / or green laser; and then the supplementary light passing through the adjustable element 07 can be incident on the third lens group 10 through the supplementary light-transmitting area of ​​the light-splitting and light-combining element 09.

[0123] Optionally, as shown in Figure 15, it is assumed that the light source 01 generates a blue laser in a first polarization state, and the supplementary light source 131 in the supplementary light source assembly 13 generates a blue laser and a red and green laser in a second polarization state; the adjustable element 07 can have polarization characteristics (such as being coated with a polarization splitting film), reflecting the blue laser in the first polarization state and transmitting the blue laser and the red and green laser in the second polarization state; the blue laser and the red and green laser passing through the adjustable element 07 can be incident on the third lens group 10 from the supplementary light-transmitting area of ​​the light-splitting and light-combining element 09.

[0124] In some embodiments, the supplemental light source assembly 13 includes a first supplemental light source and a second supplemental light source. The supplemental light includes light generated by a first color light source and light generated by a second color light source. The first supplemental light source and the second supplemental light source can generate light of the same wavelength band or light of different wavelength bands, for example, both generate red light, or one generates red light and the other generates blue light. The supplemental light-transmitting area includes a first light-transmitting area and a second light-transmitting area. The first light-transmitting area transmits light generated by the first supplemental light source, and the second light-transmitting area transmits light generated by the second supplemental light source. For example, as shown in FIG16 , a first light-transmitting area and a second light-transmitting area are respectively provided near the two ends of the light-splitting and light-combining element. The first supplemental light source LD1 and the second supplemental light source LD2 are both LD light sources that generate red laser light, and are transmitted through the first light-transmitting area and the second light-transmitting area, respectively.

[0125] In some embodiments, the supplementary light source assembly 13 includes a polarization combining element, and the supplementary light source assembly 13 includes a first supplementary light source and a second supplementary light source, and the first supplementary light source and the second supplementary light source generate light with different polarization states. The light with different polarization states generated by the first supplementary light source and the second supplementary light source is combined by the polarization combining element and then emitted into the supplementary light-transmitting area. Optionally, the first supplementary light source and the second supplementary light source can also generate light with the same polarization state, and the light generated by one of the light sources is converted into light with a different polarization state by a phase conversion element (such as a 1 / 4 wave plate) and then combined by the polarization combining element.

[0126] The polarization combining element can be a polarization beam splitter (PBS) or a polarization beam splitter. The polarization characteristics of the PBS can be used to combine light with different polarization states. The corresponding supplementary light-transmitting area can be a through-hole or a transparent substrate or a diffuser or a polarization beam splitter. Optionally, as shown in FIG17 , the light with different polarization states generated by the first supplementary light source LD1 and the second supplementary light source LD2 can be combined by the PBS and then injected into the supplementary light-transmitting area. For example, the light-splitting and combining element 09 reflects blue laser light and red and green fluorescence and transmits red and green laser light. The red and green laser light have different polarization states. The reflection band is 420 to 620 nm, and the transmission band is 635 to 680 nm. The supplementary red and green laser light is transmitted from the supplementary light-transmitting area. Optionally, the first supplementary light source LD1 can generate red, green and blue laser light of a first polarization state, and the second supplementary light source LD2 can generate red, green and blue laser light of a second polarization state. After being combined by the polarization beam splitter, they are injected into the supplementary light-transmitting area of ​​the light-splitting and combining element.

[0127] In some embodiments, the supplementary light-transmitting region reflects light of a first polarization state and transmits light of a second polarization state. The supplementary light includes target light that can excite the wavelength conversion region to produce second-color light. The target light is light of the first polarization state. The color filter element 11 in the light source system includes a region that can reflect the target light. As shown in FIG18 , a phase shift element 14 is disposed between the color filter element 11 and the light-splitting and combining element 09. The first polarization state and the second polarization state are not limited; for example, the first polarization state can be P and the second polarization state can be S. The target light can be blue light (e.g., blue laser light), UV light, etc. The phase shift element can be a quarter-wave plate.

[0128] When the first color light is focused by the first lens group and enters the wavelength conversion region, the target light passes through the supplementary light-transmitting region and phase shifter 14 and enters the color filter 11. After reflection from the color filter 11, it is converted again by phase shifter 14 into light of a second polarization state, enters the supplementary light-transmitting region, and finally enters the wavelength conversion region after reflection from the supplementary light-transmitting region. This fully utilizes the first color light generated by the light source and the target light generated by the supplementary light source assembly 13, improving light utilization.

[0129] For example, assuming the first color light is a blue laser in the P state, and the target light is a blue laser in the S state, the supplementary light-transmitting area transmits the S state light and reflects the P state light; the supplementary light source assembly also generates red laser and green laser; the wavelength conversion area includes a sub-area 1 that generates red light and a sub-area 2 that generates green light. As shown in Figure 18,

[0130] When the light source system is required to generate blue light, the light source 01 generates a P-state blue laser, and the supplementary light source assembly 13 generates an S-state blue laser; the blue laser generated by the light source 01 is transmitted through the beam reduction lens group 05, the diffusion element 06, the target light-transmitting area of ​​the light-guiding element 02 and the first lens group 03 to enter the reflection area of ​​the wavelength conversion element 04, the reflection area reflects the blue laser and is transmitted through the first lens group 03 and the light-guiding element 02 to enter the adjustable element 07, is reflected back to the light-guiding element 02 by the adjustable element 07, is transmitted through the light-guiding element 02 and the second lens group 08 to enter the light-splitting and light-combining element 09, after being reflected by the light-splitting and light-combining element 09, is combined with the S-state blue laser generated by the supplementary light-transmitting area of ​​the light-splitting and light-combining element 09, and then is injected into the third lens group 10, and is focused by the third lens group 10 and then injected into the color filter element 11; after being filtered by the filter area corresponding to the blue light in the color filter element 11, it is injected into the light homogenizing element 12, and is emitted after being homogenized by the light homogenizing element 12.

[0131] When the light source system is required to generate red light, light source 01 generates P-state blue laser light, and supplemental light source assembly 13 generates S-state blue laser light and red laser light. The blue laser light generated by light source 01 is transmitted through beam reduction lens assembly 05, diffusion element 06, the target light-transmitting area of ​​light-guiding element 02, and first lens assembly 03, and is incident on sub-area 1 of wavelength conversion element 04. Sub-area 1 is excited by the blue laser light and produces red light. The S-state blue laser light generated by supplemental light source assembly 13 is incident on color filter element 11 through the supplemental light-transmitting area and phase conversion element 14. After reflection from areas of color filter element 11 other than the filter area corresponding to blue light, it is again converted to P-state blue laser light by phase conversion element 14 and incident on the supplemental light-transmitting area. After reflection from the supplemental light-transmitting area, it is finally incident on sub-area 1 of wavelength conversion element 04, exciting sub-area 1 to produce red light. The excited red light enters first lens group 03, then enters light guide element 02. It is reflected by light guide element 02 and passes through second lens group 08 before entering light splitting and combining element 09. It is reflected by light splitting and combining element 09 and passes through third lens group 10 before entering color filter element 11. After being filtered by the red light-corresponding filter area in color filter element 11, it enters light homogenizing element 12, homogenized by light homogenizing element 12, and then emitted. If the light source system is required to generate green light, the same principles as those for generating red light are used, and will not be further described here.

[0132] From the above, it can be seen that in the light source system provided by this embodiment, the light source and the lens group are off-axis, that is, when the first color light generated by the light source passes through the light-guiding element or avoids the light-guiding element and directly enters the lens group, the optical axis of the light spot is at a certain distance from the optical axis of the lens group. After being focused by the lens group, it serves as the excitation light of the wavelength conversion zone, which can reduce the loss of the first color light and the excited second color light on the light-guiding element; and can make the light spot formed by the excited second color light when it finally enters the uniform light element be elliptical, corresponding to the long and short sides of the uniform light element, thereby improving the utilization rate of light. In addition, a diffusion element can be set before the light source enters the wavelength conversion zone, which can reduce the energy density of light on the wavelength conversion zone and improve the excitation efficiency of the wavelength conversion material; the light guide element can be provided with a through hole, and the first color light enters the lens group through the through hole, which can reduce the loss of the first color light during penetration; at the same time, by setting a focus lens group before the light source enters the light guide element, the area of ​​the through hole can be made smaller, so that the overlapping area between the through hole and the light spot of the second color light is smaller, and the loss of the second color light is less; the light source system of the above embodiment can improve the utilization rate of light, thereby improving the brightness of the projection equipment.

[0133] FIG19 is a schematic diagram of the functional modules of a projection device provided by the present application. As shown in FIG19 , the projection device includes an image processor 101 and a projection optical engine 102.

[0134] Image processor 101 may be a microcontroller, a dedicated image processing chip, or the like. The microcontroller may be an ARM chip, a microcontroller unit (MCU), or the like. The dedicated image processing chip may be an image signal processor (ISP), a graphics processing unit (GPU), or an embedded neural network processing unit (NPU). Image processor 101 may be used for video decoding, image quality processing, and the like.

[0135] The optical projection engine 102 may include a driver chip, a spatial light modulator, and the light source 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). The driver chip corresponds to the spatial light modulator. For example, the DMD may be driven by a digital light processing (DLP). The optical projection engine 102 is used to project the image to be projected into a projection screen.

[0136] In some embodiments, the projection device further includes a central controller 103 with one or more processing cores. This central controller can be a CPU, ARM, MCU, or other controller. Central controller 103 serves as the control center of the projection device, connecting various components of the entire projection device using various interfaces and circuits. It can run or execute software programs and / or operating systems stored in memory 104, as well as access data stored in memory 104. Alternatively, image processor 101 and central controller 103 can be integrated into a single processor.

[0137] In some embodiments, the projection device further includes one or more computer-readable storage media memory 104, an input module 105, a communication module 106, a power supply 107, and other components. Those skilled in the art will appreciate that the projection device structure shown in FIG19 does not limit the projection device, and may include more or fewer components than shown, or combine certain components, or arrange the components differently. Among them:

[0138] The memory 104 can be used to store software programs and an operating system. The central controller 103 executes various functional applications and data processing by running the software programs and operating system stored in the memory 104. The memory 104 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application required for a function (such as a sound playback function, an image playback function, etc.); the data storage area may store data generated based on the use of the projection device. In addition, the memory 104 may include high-speed random access memory and 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.

[0139] The projection device may further include an input module 105, which may be configured to receive input digital or character information and generate remote control, keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0140] The projection device may also include a communication module 106. In some embodiments, the communication module 106 may include a wireless module. The projection device may use the wireless module of the communication module 106 to perform short-range wireless transmission, thereby providing the user with wireless broadband Internet access. For example, the communication module 106 may be used to help the user access streaming media, etc.

[0141] The projection device also includes a power supply 107 for supplying power to various components. In some embodiments, the power supply 107 can be logically connected to the central controller 103 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The power supply 107 can also include one or more DC or AC power supplies, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and other arbitrary components.

[0142] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items. The character " / " herein generally indicates that the objects associated before and after are in an "or" relationship.

[0143] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A light source system, characterized in that: The light source system comprises a light source, a first lens group, a wavelength conversion element, a light guiding assembly and a light homogenizing element, wherein the light guiding assembly comprises a light guiding element, and the wavelength conversion element comprises a wavelength conversion area and a reflection area; The first color light generated by the light source is incident on the first lens group through the light guide element, or the first color light generated by the light source is incident on the first lens group; When the first color light is focused by the first lens group and then incident on the wavelength conversion area, the wavelength conversion area is excited by the first color light to emit second color light, and the second color light is incident on the first lens group and then incident on the light guiding component through the first lens group; When the first color light is focused by the first lens group and then incident on the reflection area, the reflection area reflects the first color light and the light is incident on the light guiding component through the first lens group; The first color light or the second color light incident on the light guiding component is incident on the light homogenizing element through the light guiding component, and is homogenized by the light homogenizing element before being emitted; Wherein, the light spot of the second color light emitted by the first lens group is elliptical; The distance between the optical axis of the first color light emitted from the light source to the first lens group and the optical axis of the first lens group is the first distance.

2. The light source system according to claim 1, characterized in that: A focusing lens group is further arranged between the light source and the light guide element. The first color light generated by the light source is focused by the focusing lens group and then incident on the light guide element.

3. The light source system according to claim 1, characterized in that: A diffusion element is further provided between the light source and the light guide element, and the first color light generated by the light source is diffused and homogenized by the diffusion element and then incident on the light guide element; The diffusion angle of the diffusion element is a first angle.

4. The light source system according to claim 1, characterized in that: The light guide element is provided with an aperture on the side facing the light source, and the first color light generated by the light source is incident into the light guide element through the aperture.

5. The light source system according to claim 1, characterized in that: The first lens group includes at least one aspherical mirror and at least one spherical mirror; the curvature radius range of one surface of the aspherical mirror is within a first preset radius range, and the curvature coefficient range is within a first preset coefficient range, and the curvature radius of another surface is within the first preset radius range, and the curvature coefficient range is within a second coefficient range; the curvature radius range of one surface of the spherical mirror is within a second preset radius range, and the curvature radius of another surface is within a third preset radius range.

6. The light source system according to claim 1, characterized in that: The light-guiding element includes a target light-transmitting area, and the first color light generated by the light source is transmitted from the target light-transmitting area to the first lens group; wherein the target side length of the target light-transmitting area is determined based on the long side length of the light-guiding element, the first distance and the long axis length of the light spot of the first color light.

7. The light source system according to claim 1, characterized in that: The distance between the lens in the first lens group closest to the wavelength conversion element and the wavelength conversion element is a second distance; And / or, the angle between the light guiding element and the wavelength conversion element is a second angle; and / or, an angle between a central ray of the first color light emitted from the first lens group to the wavelength conversion element and a normal line of the wavelength conversion element is greater than or equal to a preset angle; And / or, the light-guiding element comprises a target light-transmitting area, and the target light-transmitting area is any one of a through hole, a diffusion area, an anti-reflection area, a polarization splitting area, and a dichroic area.

8. The light source system according to claim 1, characterized in that: The light guiding assembly includes an adjustable element and a light splitting and combining element; In which, the light spot of the first color light and the light spot of the second color light are symmetrically emitted to the light homogenizing element, and the major axis and minor axis of the light spot of the second color light and / or the first color light respectively correspond to the long side and short side of the light incident surface of the light homogenizing element; and / or, the distance between the adjustable element and the light guiding element or the light splitting and combining element is a third distance.

9. The light source system according to claim 1, characterized in that: The light source system further includes a color filter element, and the first color light or the second color light incident on the light guide component is incident on the color filter element through the light guide component, and then is incident on the light homogenizing element after being filtered by the color filter element; wherein: The light guiding component comprises an adjustable element, a second lens group, a light splitting and light combining element and a third lens group. The light guiding element reflects the first color light and the second color light, and the light splitting and light combining element transmits the first color light and reflects the second color light; the second color light enters the light guiding element through the first lens group, is reflected by the light guiding element, enters the light splitting and light combining element through the second lens group, is reflected by the light splitting and light combining element to the third lens group, and enters the color filter element through the third lens group; the first color light reflected by the reflection area enters the light guiding element, is reflected by the light guiding element, enters the adjustable element through the second lens group and the light splitting and light combining element, is reflected by the adjustable element, enters the third lens group through the light splitting and light combining element, and enters the color filter element through the third lens group; Alternatively, the light guiding component comprises an adjustable element, a second lens group, a light splitting and light combining element and a third lens group; the light guiding element reflects the first color light and the second color light, and the adjustable element transmits the second color light and reflects the first color light; the first color light reflected by the reflection area enters the light guiding element, is reflected by the light guiding element, enters the adjustable element through the second lens group, is reflected by the adjustable element to the third lens group, and enters the color filter element through the third lens group; the second color light enters the light guiding element through the first lens group, is reflected by the light guiding element, enters the light splitting and light combining element through the second lens group and the adjustable element, is reflected by the light splitting and light combining element to the third lens group, and enters the color filter element through the third lens group; Alternatively, the light guiding component includes an adjustable element and a third lens group, the light guiding element transmits the first color light and reflects the second color light; the first color light reflected by the reflection area enters the light guiding element, passes through the light guiding element and then enters the adjustable element, is reflected back to the light guiding element by the adjustable element, passes through the light guiding element and the third lens group and enters the color filter element; the second color light enters the light guiding element through the first lens group, is reflected by the light guiding element, and then passes through the third lens group and enters the color filter element; Alternatively, the light guiding component comprises an adjustable element, a second lens group, a light splitting and combining element and a third lens group; the light guiding element transmits the first color light and reflects the second color light; the first color light reflected by the reflection area enters the light guiding element and passes through The second color light enters the light guide element through the first lens group, is reflected by the light guide element, enters the light splitting and light combining element through the second lens group, and enters the color filter element through the light splitting and light combining element and the third lens group; the second color light enters the light guide element through the first lens group, is reflected by the light guide element, enters the light splitting and light combining element through the second lens group, and enters the color filter element through the light splitting and light combining element and the third lens group; Alternatively, the light guiding component comprises an adjustable element, a second lens group, a light splitting and light combining element and a third lens group; the adjustable element reflects the first color light and transmits the second color light, and the light guiding element reflects the second color light; the first color light reflected by the reflection area enters the adjustable element, is reflected to the second lens group by the adjustable element, enters the light splitting and light combining element by the second lens group, and enters the color filtering element by the light splitting and light combining element and the third lens group; the second color light enters the adjustable element by the first lens group, enters the light guiding element after passing through the adjustable element, enters the second lens group after being reflected by the light guiding element, enters the light splitting and light combining element by the second lens group, and enters the color filtering element by the light splitting and light combining element and the third lens group; Alternatively, the light guiding component includes an adjustable element and a third lens group; the adjustable element reflects the first color light and transmits the second color light, and the light guiding element reflects the second color light; the first color light reflected by the reflection area enters the adjustable element, is reflected by the adjustable element to the third lens group, and enters the color filter element through the third lens group; the second color light enters the adjustable element through the first lens group, passes through the adjustable element and then enters the light guiding element, is reflected by the light guiding element and then enters the third lens group, and enters the color filter element through the third lens group; Alternatively, the light guiding component includes a third lens group, and the light guiding element reflects the first color light and the second color light; the first color light reflected by the reflection area enters the light guiding element, and after being reflected by the light guiding element, enters the color filter element through the third lens group; the second color light enters the light guiding element through the first lens group, and after being reflected by the light guiding element, enters the color filter element through the third lens group.

10. The light source system according to claim 1, characterized in that: The light source system also includes a supplementary light source assembly, and the light source system includes a light splitting and combining element, the light splitting and combining element reflects the first color light and the second color light and transmits the supplementary light generated by the supplementary light source; or the light splitting and combining element reflects the second color light and transmits the first color light and the supplementary light generated by the supplementary light source; the adjustable element reflects the first color light and transmits the supplementary light generated by the supplementary light source.

11. The light source system according to claim 10, characterized in that: The light splitting and combining element comprises a supplementary light-transmitting area, and the supplementary light-transmitting area transmits the supplementary light generated by the supplementary light source; Wherein, the supplementary light-transmitting area is any one of a through hole, a diffusion area, an anti-reflection area, a polarization splitting area, and a dichroic area.

12. The light source system according to claim 11, characterized in that: The supplementary light source assembly includes a first supplementary light source and a second supplementary light source, and the supplementary light includes light generated by a first color light source and light generated by a second color light source; The supplementary light-transmitting area includes a first light-transmitting area and a second light-transmitting area. The first light-transmitting area transmits light generated by the first supplementary light source, and the second light-transmitting area transmits light generated by the second supplementary light source.

13. The light source system according to claim 11, characterized in that: The supplementary light source assembly includes a polarization light combining element, and the supplementary light source assembly includes a first supplementary light source and a second supplementary light source, wherein the first supplementary light source and the second supplementary light source generate light with different polarization states; The light with different polarization states generated by the first supplementary light source and the second supplementary light source is combined by the polarization light combining element and then incident on the supplementary light-transmitting area.

14. The light source system according to claim 11, characterized in that: The supplementary light-transmitting area reflects light of a first polarization state and transmits light of a second polarization state, the supplementary light includes target light that can excite the wavelength conversion area to generate second color light, and the target light is light of a first polarization state; the light source system also includes a color filter element, the color filter element includes an area that can reflect the target light, and a phase conversion element is arranged between the color filter element and the light splitting and combining element; When the first color light is focused by the first lens group and then incident on the wavelength conversion area, the target light is incident on the color filter element through the supplementary light-transmitting area and the phase conversion element, and after being reflected by the color filter element, it is converted into light of a second polarization state by the phase conversion element again, and then incident on the supplementary light-transmitting area, and finally incident on the wavelength conversion area after being reflected by the supplementary light-transmitting area.

15. The light source system according to claim 1, characterized in that: The light source system further comprises a supplementary light source assembly, and the wavelength conversion element comprises a transmission region; The supplementary light generated by the supplementary light source assembly enters the first lens group through the transmission area of ​​the wavelength conversion element, enters the light guiding assembly through the first lens group, enters the light homogenizing element through the light guiding assembly, and is emitted after being homogenized by the light homogenizing element.

16. The light source system according to claim 1, characterized in that: The light source system further includes a supplementary light source assembly, and the supplementary light generated by the supplementary light source assembly is incident on the light guiding assembly through the light guiding element, and then incident on the light homogenizing element through the light guiding element, and then emitted after being homogenized by the light homogenizing element.

17. A projection device, characterized in that: A light source system comprising any one of claims 1-16.

Images