Light source system and projection equipment

Abstract

The invention relates to the technical field of display, and discloses a light source system and projection equipment, in the light source system, a light source and a lens group are off-axis, that is, when light generated by the light source passes through a light guide element or avoids the light guide element and directly enters the lens group, the optical axis of a light spot and the optical axis of the lens group are spaced by a certain distance; after being focused by the lens group, the light is used as exciting light of the wavelength conversion area, so that the loss of the first colored light and the excited second colored light on the light guide element can be reduced; when the excited second color light finally enters the dodging element, formed light spots are oval and correspond to the long and short edges of the dodging element, and the light utilization rate is increased; the brightness of the projection equipment can be improved.

Description

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 angles, different brightness and different shapes into a uniform light spot that illuminates the effective area of ​​the display chip.

[0003] In the field of projection display, traditional light bulbs are increasingly not used due to their own defects, while new light sources such as LED, phosphor and laser have shown excellent characteristics in brightness, color, life, energy consumption, etc., and have gradually become the mainstream of light sources for projection display. Lasers have the advantages of high brightness and high light efficiency as light sources, and blue lasers are often used to excite fluorescence as light sources. However, in the existing system, because the spectroscopic element needs to be coated with a film layer that transmits blue light and reflects fluorescence, and the thickness of the spectroscopic sheet is generally 0.5 to 1.1 mm, it has an absorption effect on blue light. Finally, the coating and absorption cause the brightness of the blue laser to lose 2% to 5%, resulting in a loss of brightness of the projection light source and a decrease in light utilization. At the same time, the focus spot of the blue laser in the conventional system is generally circular, while the spatial light modulator in the projection system is generally rectangular, such as a 16:9 aspect ratio. According to the matching of the optical expansion, the laser focus spot is elliptical, which will greatly improve the system efficiency. Summary of the invention

[0004] The present application provides a light source system that can be used in a projection device, which can improve the utilization rate of light and thus improve the brightness of the projection device.

[0005] In a first aspect, the present application provides a light source system, the light source system comprising a light source, a first lens group, a wavelength conversion element, a light guiding component and a light homogenizing element, the light guiding component comprising a light guiding element, and the wavelength conversion element comprising a wavelength conversion region and a reflection region;

[0006] 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;

[0007] When the first color light is focused by the first lens group and then enters the wavelength conversion area, the wavelength conversion area 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 guiding component through the first lens group;

[0008] 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 then incident on the light guiding component through the first lens group;

[0009] 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;

[0010] 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.

[0011] In some embodiments, a focusing lens group is further disposed between the light source and the light guide element, and the first color light generated by the light source is focused by the focusing lens group and then emitted into the light guide element.

[0012] In some embodiments, a diffusion element is further disposed 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.

[0013] In some embodiments, a stop is disposed 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.

[0014] 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 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.

[0015] 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.

[0016] In some embodiments, 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;

[0017] And / or, the angle between the light guiding element and the wavelength conversion element is a second angle;

[0018] and / or, the angle between the central light of the first color light emitted from the first lens group to the wavelength conversion element and the normal line of the wavelength conversion element is greater than or equal to a preset angle;

[0019] And / or, the light-guiding 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.

[0020] In some embodiments, the light guiding assembly includes an adjustable element and a light splitting and combining element;

[0021] Among them, 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 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 the third distance.

[0022] 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 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:

[0023] 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;

[0024] Alternatively, the light guiding component 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 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;

[0025] 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;

[0026] Alternatively, the light guiding component includes 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 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 combining element, and then enters the color filtering element through the light splitting and 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 combining element, and then enters the color filtering element through the light splitting and combining element and the third lens group;

[0027] Alternatively, the light guiding component 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, 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 through the second lens group, and enters the color filtering element through the light splitting and light combining element and the third lens group;

[0028] 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;

[0029] 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, it 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, it enters the color filter element through the third lens group.

[0030] 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.

[0031] In some embodiments, the light-splitting and light-combining element includes a supplementary light-transmitting area, and the supplementary light-transmitting area transmits the supplementary light generated by the supplementary light source;

[0032] 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.

[0033] 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;

[0034] 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.

[0035] In some embodiments, the supplementary light source assembly includes a polarization light combining element, the supplementary light source assembly 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;

[0036] The lights with different polarization states generated by the first supplementary light source and the second supplementary light source are combined by the polarization light combining element and then emitted into the supplementary light transmission area.

[0037] In some embodiments, 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 the first polarization state; the light source system further includes a color filter element, the color filter element includes an area 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;

[0038] When the first color light is focused by the first lens group and then enters the wavelength conversion area, the target light enters 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 the second polarization state by the phase conversion element again, and then enters the supplementary light-transmitting area, and finally enters the wavelength conversion area after being reflected by the supplementary light-transmitting area.

[0039] In some embodiments, the light source system further comprises a supplemental light source assembly, and the wavelength conversion element comprises a transmissive region;

[0040] 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 guide assembly through the first lens group, enters the light homogenizing element through the light guide assembly, and is homogenized by the light homogenizing element before being 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 emitted into the light guiding assembly via the light guiding element, and then emitted into the light homogenizing element after being homogenized by the light homogenizing element.

[0042] In a second aspect, the present application provides a projection device, comprising a 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 by 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 guide element or avoids the light guide 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 guide element; and when the excited second color light finally enters the light uniforming element, the light spot formed is elliptical, corresponding to the long and short sides of the light uniforming element, thereby improving the utilization rate of light. In addition, a diffusion element may be provided before the light source enters the wavelength conversion zone, so as to reduce the energy density of the light in the wavelength conversion zone and improve the excitation efficiency of the wavelength conversion material; the light guide element may be provided with a through hole, and the first color light enters the lens group through the through hole, so as to reduce the loss of the first color light during penetration; at the same time, by providing a focus reduction lens group before the light source enters the light guide element, the area of ​​the through hole may 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, so as to improve the brightness of the projection device. 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] Figure 1 is a structural schematic diagram of a light source system in an embodiment of the present application;

[0046] Figure 2 is a schematic structural diagram of a light guide element in an embodiment of the present application;

[0047] Figure 3 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0048] Figure 4 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0049] Figure 5 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0050] Figure 6 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0051] Figure 7 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0052] Figure 8 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0053] Fig. 9 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0054] Fig.10 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0055] Fig.11 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0056] Fig.12 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0057] Fig.13 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0058] Fig.14 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0059] Fig.15 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0060] Fig.16 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0061] Fig.17 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0062] Fig.18 is a structural schematic diagram of a light source system in another embodiment of the present application;

[0063] Fig.19 It is a schematic diagram of the structure of a projection device in one embodiment of the present application. DETAILED DESCRIPTION

[0064] In order to make those skilled in the art 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, rather than 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 the field without making creative work should belong to the scope of protection of the present 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 the features in the embodiments can be combined with each other.

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

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

[0067] In order to thoroughly 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, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0068] This embodiment provides a light source system, such as Figure 1 As shown, the light source system includes a light source 01, a first lens group 03, a wavelength conversion element 04, a light guiding assembly and a light homogenizing element 12, the light guiding assembly 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 the light source 01 is incident on the first lens group 03 through the light guide element 02, or the first color light generated by the light source 01 is incident on the first lens group 03; when the first color light is focused by the first lens group 03 and then incident on the wavelength conversion zone, the wavelength conversion zone is stimulated by the first color light to emit the second color light, the second color light is incident on the first lens group 03, and then incident on the light guiding component through the first lens group 03; when the first color light is focused by the first lens group 03 and then incident on the reflection zone, the reflection zone reflects the first color light and then incident on the light guiding component through the first lens group 03.

[0070] The first color light or the second color light incident on the light guide component enters the light homogenizing element 12 through the light guide component, and is emitted after being homogenized by the light homogenizing element 12. 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 component enters the color filter element 11 through the light guide component, and is emitted after being filtered by the color filter element 11.

[0071] 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 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]

[0074]

[0075] 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 is in the range of 25 to 75 degrees.

[0076] There is no restriction on the light source 01 and the first color light, which can be an LED light source or a laser LD light source or other new light sources, or a mixed light source of an LED light source and a laser LD light source; there is no restriction on the number of light-emitting chips in the light source 01, which can be a single light-emitting chip or a light-emitting chip array. For example, the light source 01 can be an LD light source that generates blue laser, etc., and the first color light can be blue laser, UV light, etc.

[0077] The wavelength conversion area has a wavelength conversion material, which can be a phosphor or a phosphor powder, for example, a yellow phosphor that emits yellow light when excited, such as a yttrium aluminum garnet (YAG) series phosphor containing cerium (Ce) as an activator, or a green phosphor powder, a red phosphor powder, a cyan phosphor powder, etc. The wavelength conversion area can include at least one sub-area, each sub-area corresponds to a wavelength conversion material, and can generate at least one color light with a different wavelength band from the first color light, that is, the second color light includes at least one color light with a different wavelength band from the first color light, for example, the second color light can be at least one of red light, green light, yellow light, and blue light.

[0078] The reflective area has the property of reflecting all light, and can be, for example, any one of a reflector, a polished metal layer or metal plate, a substrate coated with a reflective film, particles with diffuse reflection, and a microstructured reflective layer. Optionally, the reflective surface of the reflective area and the wavelength conversion area are substantially on the same plane.

[0079] The color filter element can be a filter wheel, including multiple filter areas, which filter the first color light, the second color light and the supplementary light respectively; for example, the color filter element includes filter areas for filtering blue light, red light and green light. The color filter element can be coated with a dichroic film on one side and a diffuser on the other side; or it can be a double-layer structure, with one layer being a diffuser and one layer being a filter. The color filter element 11 and the wavelength conversion element 04 can be driven by the same driving device, or they can be driven by different driving devices. The light homogenizing element can be a compound eye or a light rod, etc.

[0080] Optionally, the first lens group 03 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 the first preset radius range, the curvature coefficient range is within the first preset coefficient range, the curvature radius of the other surface is within the first preset radius range, and the curvature coefficient range is within the second coefficient range; the curvature radius range of one surface of the spherical mirror is within the second preset radius range, and the curvature radius of the other surface is within the 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 range of one surface of the aspherical mirror is within 15mm to 30mm, the curvature coefficient range is within 1 to 2, the curvature radius of the other surface is within 15mm to 30mm, and the curvature coefficient range is within 0.3 to 1; the curvature radius range of one surface of the spherical mirror is within 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 aspherical mirror is within the range of -30mm to 30mm, the curvature coefficient is within the range of -20 to 20, and the curvature radius of another surface is within the range of -30mm to 30mm, and the curvature coefficient is within the range of -10 to 10; the curvature radius of one surface of a spherical mirror is within the range of 10mm to 20mm, and the curvature radius of another surface is greater than or equal to 100. Figure 1 As shown, C1 can be a spherical mirror and C2 can be an aspherical mirror, or C2 can be a spherical mirror and C1 can be an aspherical 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 elliptical, which better matches the shape of the subsequent homogenizing element and can improve the utilization rate of light.

[0081] 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, such as Figure 1 That is, the distance between the surface of the lens C1 and the surface of the wavelength conversion element 04 facing the lens C1 is within 0.5 to 1.5 mm.

[0082] Optionally, the angle between the central light 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. There is no limitation on the preset angle, and the preset angle can be determined according to 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 appropriately incident on the wavelength conversion element at an angle, 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 guiding component, etc., the light spot is symmetrically incident on the uniform light element, which can improve the utilization rate of light.

[0083] In some embodiments, the light guide element 02 includes a target light transmission area, and the first color light generated by the light source 01 is transmitted from the target light transmission area to the first lens group 03 .

[0084] Optionally, the overlapping area between the target light-transmitting area and the spot area formed by the second color light on the light-guiding element is less than or equal to the area of ​​the target light-transmitting area of ​​the preset ratio. The preset ratio is not limited and can be customized according to the actual application, for example, the ratio is within 0 to 10%. The shape of the target light-transmitting area can be unlimited and can be rectangular, circular, elliptical, etc.

[0085] Optionally, the target side length of the target light transmission area is determined according to 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.

[0086] Optionally, the target side length L of the target light-transmitting area satisfies the following formula:

[0087]

[0088] 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.

[0089] Optionally, D3 sinα≤L2 sinβ, L2 can be Fig.19 The long axis length of the spatial light modulator in the projection optical machine shown in the figure, 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).

[0090] 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.

[0091] 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 light-transmitting substrate coated with an anti-reflection film, the polarization splitting area can be a light-transmitting 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 light-transmitting 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 the reflection band can include at least 500 to 680 nm, and the transmission band includes at least 440 to 470 nm. Figure 2 As shown in (2), E represents the spot area formed by the second color light on the light guide element, and D represents the target light transmission area. Optionally, the target light transmission area can be located at either end of the light guide element. The target light transmission area is a through hole, which can make the first color light have no loss or less loss when passing through the light guide element.

[0092] 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 passing through the target light-transmitting area; that is, the spot size of the first color light when passing 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.

[0093] Optionally, the first color light generated by the light source 01 can also avoid the light guide element 02 and directly enter the first lens group from the side of the light guide element 02, which can reduce the loss of the first color light on the light guide element. Optionally, the light guide element 02 can also be an element with an L-shaped end, and the first color light enters the first lens group from the L-shaped end.

[0094] 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 according to actual application conditions, for example, the value of the second angle can be within 30 to 45 degrees. For example, if the light guide element is set at 45 degrees relative to the horizontal line, the inclination angle range of the wavelength conversion element relative to the horizontal line is set between 0 and 15 degrees, so that the angle between the light guide element 02 and the wavelength conversion element 04 is within 30 to 45 degrees.

[0095] In some embodiments, Figure 1 As shown, a beam reduction lens group 05 is also provided between the light source 01 and the light guide element 02. The first color light generated by the light source 01 is beam-reduced by the beam reduction lens group 05 and then incident on the light guide element 02. The beam reduction lens group is used to make the size of the light spot incident on the light guide element as small as possible, thereby reducing the loss of the second color light incident on the light guide element in the target light transmission area and improving the utilization rate of light. Optionally, the beam reduction lens group may also include a collimating lens, or the beam reduction lens group may be replaced by a collimating lens; or it may also be a beam expansion lens group.

[0096] In some embodiments, Figure 1As shown, 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 beam-contracted 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 a first angle, and the diffusion angle may refer to a diffusion half angle or a diffusion full angle; the first angle may be customized according to actual application conditions, 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 actual application conditions, 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, and the energy density incident on the wavelength conversion zone is reduced, so that the excitation efficiency of the wavelength conversion zone can be improved; for example, the energy density is made 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 passes through the beam reducing lens group. Optionally, the beam reducing lens group is also replaced by 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.

[0097] In some embodiments, an aperture is provided on the light source-facing side of the light guide element 02, and the first color light generated by the light source or the diffused and homogenized first color light or the first color light after being condensed enters the light guide element through the aperture. The aperture can prevent the light of the first color light from entering areas outside the target light transmission area, reducing the loss of the first color light, and effectively improving the utilization rate of light; and the light is emitted to the wavelength conversion area through the first focusing lens group, with a low energy density, which can improve the excitation efficiency of the wavelength conversion area.

[0098] Optionally, the second color light emitted through the first lens group is an elliptical spot, which is determined by factors such as the curvature parameter 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.

[0099] 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 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; when directed toward the light homogenizing element, the light axes 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 proximally incident into 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; thus, it better matches the spatial light modulator in the projection optical machine and can achieve higher light utilization.

[0100] 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 proximally incident on the light-homogenizing element.

[0101] In some embodiments, Figure 1 As shown, the light guiding assembly includes an adjustable element, a second lens group 08, a light splitting and combining element 09 and a third lens group 10, and 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 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 combining element 09 reflects red and green light and transmits blue light; the transmission band range is at least 450 to 470 nm, and the reflection band 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 combining element is a third distance.

[0102] The second color light is incident on the light-guiding element 02 through the first lens group 03, and after being reflected by the light-guiding element 02, it is incident on the light-splitting and light-combining element 09 through the second lens group 08, and is reflected by the light-splitting and light-combining element 09 to the third lens group 10, and is incident on the color filter element 11 through the third lens group 10; the first color light reflected from the reflection area is incident on the light-guiding element 02, and after being reflected by the light-guiding element 02, it is incident on the adjustable element 07 through the second lens group 08 and the light-splitting and light-combining element 09, and after being reflected by the adjustable element 07, it is incident on the third lens group 10 through the light-splitting and light-combining element 09, and is incident on the color filter element 11 through the third lens group 10.

[0103] In some embodiments, Figure 3 As shown, the light guiding assembly includes a second lens group 08, a light splitting and combining element 09 and a third lens group 10, and 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, and the reflection band can contain at least 500 to 680nm, and the transmission band can contain at least 440 to 470nm. 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.

[0104] 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 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 enters the color filter element 11 by the light-splitting and light-combining element 09 and the third lens group 10.

[0105] Optionally, the light guide element 02 includes region A, region B, region C and target light transmission region D. Region A and region 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 the loss of light; the target light transmission region D is referred to above and will not be described here. Figure 2 As shown in (1), the first color light can be transmitted from region A to the tunable element 07, and the first color light reflected from the tunable element 07 back to the light guide element 02 is transmitted from region B to the second lens group 08.

[0106] Alternatively, if Figure 4 As shown, 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 refer to Figure 3As shown, no further description is given here.

[0107] In some embodiments, Figure 5 As shown, the light guiding assembly includes a third lens group 10, and the light guide element 02 transmits the first color light and reflects the second color light; the color filter element 11 and the wavelength conversion element 04 use different driving devices. The first color light reflected by the reflection area enters the light guide element 02, passes through the light guide element and then enters the adjustable element 07, is reflected back to the light guide element 02 by the adjustable element 07, passes through the light guide element 02 and the third lens group 10 and enters the color filter element 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 element 11. The adjustable element 07 can be a reflector or a reflective diffuser. Optionally, the third lens group 10 includes at least one aspherical mirror.

[0108] In some embodiments, Figure 6 As shown, the light guiding assembly includes a second lens group 08, a light splitting and combining element 09 and a third lens group 10, and 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, and the reflection band range is at least 450 to 470 nm and the transmission band 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.

[0109] 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, enters the adjustable element 07 through the second lens group 08, 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, enters the light-splitting and light-combining element 09 through the second lens group 08 and the adjustable element 07, 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.

[0110] In some embodiments, Figure 7 As shown, the light guide assembly includes a third lens group 10, and the light guide element 02 reflects the first color light and the second color light; the first color light reflected by the reflection area enters the light guide element 02, and after being reflected by the light guide element 02, it enters the color filter element 11 through the third lens group 10; the second color light enters the light guide element 02 through the first lens group 03, and after being reflected by the light guide element 02, it enters the color filter element 11 through the third lens group 10. At this time, the light homogenizing element can be a compound eye.

[0111] In some embodiments, Figure 8 As shown, 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.

[0112] The first color light reflected from 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.

[0113] In some embodiments, Fig. 9 As shown, 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 refer to Figure 8 described.

[0114] The first color light reflected from the reflection area 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 adjustable element 07 through the first lens group 03, passes through the adjustable element 07 and enters the light guide element 02, is reflected by the light guide element 02 and enters the third lens group 10, and enters the color filter element 11 through the third lens group 10.

[0115] Optionally, one or more of the adjustable element 07, the light-guiding element 02, and the light-splitting and light-combining element 09 may be elements with a certain curvature, and the 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 set. For example, Figure 3 The adjustable element 07 shown is a reflector with a certain curvature, so the second lens group and / or the third lens group may not be provided, and the first color light reflected by the adjustable element 07 and the second color light reflected by the light guide element 02 may be coaxial and finally enter the light homogenizing element.

[0116] In some embodiments, the light source system further includes a supplementary light source assembly 13. The supplementary light generated by the supplementary light source assembly 13 can be emitted into the light guide assembly through the light guide element, and then emitted into the light homogenizing element through the light guide element, and then emitted after being homogenized by the light homogenizing element; the color gamut and brightness of the light source system can be increased. Optionally, the supplementary light can be emitted into the light guide assembly through the target light transmission area of ​​the light guide element, or the light guide assembly has the characteristic of transmitting the supplementary light.

[0117] Among them, the supplementary light source assembly 13 may include at least one supplementary light source, which may be an LED light source or an LD light source, and each light source may be a single light-emitting chip or an array of light-emitting chips; the supplementary light includes supplementary light of at least one band. The polarization state of the supplementary light is not limited, and may be a P state or an S state, or a P state and an S state. Optionally, the supplementary light source assembly 13 includes an LD light source or an LED light source that generates at least one of red light, green light and blue light, and the supplementary light is 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 is red laser. Optionally, the supplementary light source assembly 13 includes a mixed light source of an LED light source and an LD light source; the supplementary light is at least two of red laser, green laser and blue laser and LED light, green LED light and blue LED light. Optionally, a focusing collimating lens group may also be adaptively set in the supplementary light source assembly 13.

[0118] like Fig.10 As shown, 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.

[0119] In some embodiments, the wavelength conversion element includes a transmission area, and the supplementary light generated by the supplementary 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 emitted after being homogenized by the light homogenizing element. The transmission area can be any one of a through hole, a light-transmitting substrate (such as white glass), a diffusion area, and an anti-reflection area; the diffusion area can be a diffusion sheet, and the anti-reflection area can be a light-transmitting substrate coated with an anti-reflection film. Optionally, the supplementary light generated by the supplementary 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.

[0120] like Fig.11As shown, the supplementary light source assembly 13 includes a supplementary light source 131, an 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, after being reflected by the light guide element 02, it is 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 is emitted after being homogenized by the light homogenizing element 12.

[0121] In some embodiments, Fig.12 As shown, the supplementary light source assembly 13 includes a supplementary light source 1 131 and a supplementary light source 2 132; the supplementary light generated by the supplementary light source 1 131 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, and after being reflected by the light guide element 02, it can be incident on the third lens group 10; the supplementary light generated by the supplementary light source 2 132 can be transmitted through the light guide element 02 and incident on the third lens group 10; the supplementary light incident on the third lens group 10 can be incident on the color filter element 11 through the third lens group 10, and after being filtered by the color filter element 11, it can be incident on the light homogenizing element 12, and then be emitted after being homogenized by the light homogenizing element 12. For example, the supplementary light source 1 131 is a red laser light source, and the supplementary light source 2 132 is a red LED light source; the red laser and the red LED light can have different wavelength ranges, and the light guide element 02 can combine the light by wavelength; or the light guide element 02 includes a target area, and the target area reflects the red laser. In this case, the wavelength conversion element may include only a wavelength conversion region that generates green light.

[0122] In some embodiments, 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. Optionally, the light splitting and 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 combining element and the third lens group, enters the light homogenizing element after being filtered by the color filter element, and exits after being homogenized by the light homogenizing element.

[0123] Optionally, the light-splitting and light-combining element may have a dichroic property, such as 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 supplementary light generated by the supplementary light source. For example, the wavelength conversion zone is excited to generate green light, and the supplementary light generated by the supplementary light source assembly 13 is red laser, then the light-splitting and light-combining element reflects blue light and green light and / or red light (fluorescence) and transmits red laser, and the reflection band at least includes 420 to 620 nm, and the transmission band at least includes 635 to 680 nm.

[0124] Optionally, the light-splitting and light-combining element includes a supplementary light-transmitting area, which transmits the supplementary light generated by the supplementary light source; wherein the supplementary 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 light-transmitting substrate coated with an anti-reflection film, and the polarization splitting area can be a light-transmitting substrate coated with a polarization splitting film (such as reflecting or transmitting S light, transmitting or reflecting P light); the supplementary light-transmitting area can also be a light-transmitting substrate coated with a dichroic film, and the dichroic film reflects the first color light and the second color light and transmits the supplementary light. For example, Fig.13 As shown, assuming that the wavelength conversion area is excited to generate green light and red light, and the supplementary light generated by the supplementary light source 131 is red laser; then the light splitting and light combining element reflects red light, blue light and green light, and the supplementary red laser is transmitted from the supplementary light transmission area, and the supplementary light transmission area may correspond to a diffuser, a through hole, a light-transmitting substrate coated with an anti-reflection film, etc.; the size of the supplementary light transmission area is not limited, for example, the size is within the range of 8mm*8mm, such as 5.5mm*3.6mm. Optionally, the light source assembly also includes a focusing collimating lens group 134 corresponding to the supplementary light source.

[0125] Alternatively, if Fig.14 As shown, 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 the 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 lightsplitting and combining element 09.

[0126] Alternatively, if Fig.15 As shown, it is assumed that the light source 01 generates a blue laser of a first polarization state, and the supplementary light source 131 in the supplementary light source assembly 13 generates a blue laser and a red-green laser of 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 of the first polarization state, and transmitting the blue laser and the red-green laser of the second polarization state; the blue laser and the red-green laser that pass through the adjustable element 07 can be emitted into the third lens group 10 from the supplementary light-transmitting area of ​​the light-splitting and light-combining element 09.

[0127] In some embodiments, the supplementary light source assembly 13 includes a first supplementary light source and a second supplementary light source, the supplementary light includes light generated by a first color light source and light generated by a second color light source, the first supplementary light source and the second supplementary 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, etc.; 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. For example, Fig.16 As shown, a first light-transmitting area and a second light-transmitting area are respectively arranged near the two ends of the light-splitting and light-combining element, and the first supplementary light source LD1 and the second supplementary light source LD2 are both LD light sources that generate red lasers, which are transmitted from the first light-transmitting area and the second light-transmitting area respectively.

[0128] In some embodiments, the supplementary light source assembly 13 includes a polarization light 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 are combined by the polarization light combining element and then emitted into the supplementary light transmission area. Optionally, the first supplementary light source and the second supplementary light source may also generate light with the same polarization state, wherein 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 quarter wave plate) and then combined by the polarization light combining element.

[0129] The polarization light combining element may be a polarization beam splitter (PBS) or a polarization beam splitter, and the polarization characteristics of the PBS may be used to combine light with different polarization states, and the corresponding supplementary light-transmitting area may be a through hole or a light-transmitting substrate or a diffuser or a polarization beam splitter. Fig.17 As shown, 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 light-combining element 09 reflects the blue laser and the red and green fluorescence and transmits the red and green lasers. The red and green lasers have different polarization states, the reflection band is 420-620nm, and the transmission band is 635-680nm. The supplementary red and green lasers are transmitted from the supplementary light-transmitting area. Optionally, the first supplementary light source LD1 can generate red, green and blue three-color lasers in a first polarization state, and the second supplementary light source LD2 can generate red, green and blue three-color lasers in a second polarization state, and after being combined by the polarization splitter, they are injected into the supplementary light-transmitting area of ​​the light-splitting and light-combining element.

[0130] In some embodiments, 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 a second color light, and the target light is light of a first polarization state; the color filter element 11 in the light source system includes an area that can reflect the target light; Fig.18As shown, a phase conversion element 14 is provided 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 the P state and the second polarization state can be the S state; the target light can be blue light (such as blue laser), UV light, etc.; the phase conversion element can be a 1 / 4 wave plate.

[0131] When the first color light is focused by the first lens group and then enters the wavelength conversion area, the target light enters the color filter element 11 through the supplementary light transmission area and the phase conversion element 14, and after being reflected by the color filter element 11, it is converted into light of the second polarization state by the phase conversion element 14 again, enters the supplementary light transmission area, and finally enters the wavelength conversion area after being reflected by the supplementary light transmission area. The first color light generated by the light source and the target light generated by the supplementary light source assembly 13 can be fully utilized, thereby improving the utilization rate of light.

[0132] For example, assuming that the first color light is a blue laser in the P state, 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. Fig.18 As shown, where:

[0133] 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 transmission area of ​​the light guide 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 transmits through the first lens group 03 and the light guide element 02 to enter the adjustable element 07, is reflected back to the light guide element 02 by the adjustable element 07, is transmitted through the light guide element 02 and the second lens group 08 to enter the light splitting and combining element 09, after being reflected by the light splitting and combining element 09, is combined with the S-state blue laser generated by the supplementary light source assembly 13 transmitted through the supplementary light transmission area of ​​the light splitting and 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.

[0134] When the light source system is required to generate red light, the light source 01 generates a blue laser in the P state, and the supplementary light source assembly 13 generates a blue laser in the S state and a red laser. The blue laser generated by the light source 01 is incident on the sub-area 1 of the wavelength conversion element 04 through the beam reduction lens group 05, the diffusion element 06, the target light transmission area of ​​the light guide element 02, and the first lens group 03, and the sub-area 1 is excited by the blue laser to generate red light. The blue laser in the S state generated by the supplementary light source assembly 13 is incident on the color filter element 11 through the supplementary light transmission area and the phase conversion element 14, and after being reflected by the area of ​​the color filter element 11 other than the filter area corresponding to the blue light, it is converted into a blue laser in the P state again by the phase conversion element 14, and is incident on the supplementary light transmission area. After being reflected by the supplementary light transmission area, it is finally incident on the sub-area 1 of the wavelength conversion element 04, and the sub-area 1 is excited to generate red light. The excited red light enters the first lens group 03, enters the light guide element 02 through the first lens group 03, is reflected by the light guide element 02 and enters the light splitting and combining element 09 through the second lens group 08, is reflected by the light splitting and combining element 09 and enters the color filter element 11 through the third lens group 10, is filtered by the filter area corresponding to the red light in the color filter element 11, and then enters the light homogenizing element 12, and then exits after being homogenized by the light homogenizing element 12. When the light source system is required to generate green light, the same principle is used as for generating red light, and no further description is given here.

[0135] From the above, it can be seen that in the light source system provided by the present 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 guide element or avoids the light guide 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, and 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 guide element; and when the excited second color light finally enters the uniform light element, the light spot formed is 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 may be provided before the light source enters the wavelength conversion zone, so as to reduce the energy density of the light in the wavelength conversion zone and improve the excitation efficiency of the wavelength conversion material; the light guide element may be provided with a through hole, and the first color light enters the lens group through the through hole, so as to reduce the loss of the first color light during penetration; at the same time, by providing a focus reduction lens group before the light source enters the light guide element, the area of ​​the through hole may 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, so as to improve the brightness of the projection device.

[0136] Fig.19 This is a schematic diagram of the functional modules of a projection device provided in this application. Fig.19 As shown, the projection device includes an image processor 101 and a projection optical engine 102. Among them:

[0137] The image processor 101 may be a microcontroller, a dedicated image processing chip, etc. The microcontroller may be an ARM chip, a microcontroller unit (MCU), etc. The dedicated image processing chip may be an image signal processor (ISP), a graphics processing unit (GPU), an embedded neural network processor (NPU), etc. The image processor 101 may be used for video decoding, image quality processing, etc.

[0138] The projection optical machine 102 may include a driver chip, a spatial light modulator, and the light source system described in the above embodiment. The spatial light modulator may be a digital micromirror device (DMD), a liquid crystal display (LCD), a liquid crystal on silicon (LCOS), etc. The driver chip corresponds to the spatial light modulator, for example, the digital micromirror device may be driven by a digital light processing element (DLP). The projection optical machine 102 is used to project the image to be projected into a projection screen.

[0139] In some embodiments, the projection device further includes a central controller 103 with one or more processing cores, which may be a CPU, ARM, MCU or other controller. The central controller 103 is the control center of the projection device, and uses various interfaces and lines to connect various parts of the entire projection device, and can run or execute software programs and / or operating systems stored in the memory 104, and call data stored in the memory 104. Optionally, the image processor 101 and the central controller 103 may be integrated into one processor.

[0140] In some embodiments, the projection device further includes a memory 104 of one or more computer-readable storage media, an input module 105, a communication module 106, a power supply 107 and other components. Those skilled in the art will appreciate that Fig.19 The structure of the projection device shown in the figure does not constitute a limitation on the projection device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0141] The memory 104 can be used to store software programs and operating systems. The central controller 103 executes various functional applications and data processing by running the software programs and operating systems stored in the memory 104. The memory 104 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the projection device, etc. In addition, the memory 104 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 104 can also include a memory controller to provide the central controller 103 with access to the memory 104.

[0142] The projection device may further include an input module 105, which may be used 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.

[0143] The projection device may further include a communication module 106. In some embodiments, the communication module 106 may include a wireless module. The projection device may perform short-distance wireless transmission through the wireless module of the communication module 106, thereby providing the user with wireless broadband Internet access. For example, the communication module 106 may be used to help the user access streaming media, etc.

[0144] The projection device further 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 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. The power supply 107 can also include any components such as one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, and power status indicators.

[0145] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, 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 other meanings. It should also be understood that the term "and / or" used in this article 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 a kind of "or" relationship.

[0146] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A light source system, It is 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, It is 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, It is 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, It is 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, It is 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, It is 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, It is 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, It is 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, It is 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 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 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 second lens group and then enters the light splitting and light combining element, and then enters the color filtering element by the light splitting and light combining element and the third lens group; the second color light enters the light guiding element by 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 filtering element by 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, It is 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, It is 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, It is 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, It is 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, It is 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, It is 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, It is 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, It is characterized in that A light source system comprising any one of claims 1-16.

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