CN118119890A

CN118119890A - Laser projection device

Info

Publication number: CN118119890A
Application number: CN202280060249.4A
Authority: CN
Inventors: 王强; 李巍; 顾晓强
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2021-09-27
Filing date: 2022-09-19
Publication date: 2024-05-31
Also published as: CN114675482A; CN113777870A

Abstract

A laser projection device (1) includes a light source assembly (10), a light machine (20), and a lens (30). The light source assembly (10) comprises at least one laser (101), a light combining component (103) and a fluorescent wheel (105). At least one laser (101) is configured to emit a laser beam. The light combining means (103) comprises a reflective region (1031) and at least one transmissive region (1032). The reflective region (1031) is configured to reflect the incident laser light beam and fluorescence. The at least one transmissive region (1032) is configured to transmit a laser beam emitted by the at least one laser (101). The fluorescent wheel (105) includes a first region (1051) and a second region (1052). The first region (1051) is configured to diffusely reflect the laser light beam transmitted through the at least one transmission region (1032) to the light combining member (103). The second region (1052) is configured to be stimulated to produce fluorescence upon irradiation of a laser beam transmitted by the at least one transmissive region (1032).

Description

Laser projection device

The application claims priority from China patent application with application number 202111135121.3 filed on the year 2021, month 09 and day 27; priority of chinese patent application No. 202220643953.X filed on 22 at 03 of 2022, the entire contents of which are incorporated herein by reference.

Technical Field

The disclosure relates to the technical field of laser projection, in particular to laser projection equipment.

Background

The laser projection technology uses three primary colors of laser as a light source, and can truly reproduce rich and gorgeous colors in objective world. The laser projection technology has the characteristics of wide color gamut range, long service life, high efficiency, low power consumption and the like, and is widely applied.

Disclosure of Invention

In one aspect, a laser projection device is provided. The laser projection device comprises a light source assembly, an optical machine and a lens. The light source assembly is configured to emit an illumination beam. The light engine is configured to modulate an illumination beam emitted by the light source assembly to obtain a projection beam. The lens is configured to image the projection beam. The light source assembly comprises at least one laser, a light combining component and a fluorescent wheel. The at least one laser is configured to emit a laser beam. The light combining component is positioned on the light emitting side of the at least one laser and is obliquely arranged relative to the light emitting direction of the at least one laser. The light combining component comprises a reflecting area and at least one transmitting area. The reflective region is configured to reflect an incident laser beam and fluorescence. The at least one transmissive region is configured to transmit a laser beam emitted by the at least one laser. The fluorescent wheel is positioned on one side of the light combining component, which is far away from the at least one laser. The fluorescent wheel includes a first region and a second region. The first region is configured to diffusely reflect the laser beam transmitted through the at least one transmission region to the light combining member. The second region is configured to be stimulated to produce fluorescence upon irradiation with a laser beam transmitted by the at least one transmissive region. Along with the rotation of the fluorescent wheel, the laser beam transmitted by the at least one transmission area irradiates the first area and the second area respectively, and the laser beam reflected by the first area and the fluorescent light emitted by the second area are respectively incident to the light combining component and reflected to the light outlet of the light source component through the light combining component. The laser beam and the fluorescence emitted from the light outlet of the light source assembly form the illumination beam.

In another aspect, a laser projection device is provided. The laser projection device comprises a light source assembly, an optical machine and a lens. The light source assembly is configured to emit an illumination beam. The light engine is configured to modulate an illumination beam emitted by the light source assembly to obtain a projection beam. The lens is configured to image the projection beam. The light source assembly comprises a plurality of lasers, a plurality of first lens groups, a light combining component, a second lens group and a fluorescent wheel. The plurality of lasers are configured to emit a laser beam. The plurality of first lens groups correspond to the plurality of lasers, and the plurality of first lens groups are configured to converge laser beams emitted by the plurality of lasers. The light combining component is positioned on the light emitting sides of the lasers and is obliquely arranged relative to the light emitting directions of the lasers. The light combining component comprises a reflecting area and a plurality of transmitting areas. The reflective region is configured to reflect an incident laser beam. The plurality of transmission areas correspond to the plurality of first lens groups, and the plurality of transmission areas are distributed at intervals. The plurality of transmission regions are configured to transmit the laser beams condensed by the plurality of first lens groups. The second lens group is positioned at one side of the light combining component far away from the plurality of lasers, and is configured to converge laser beams transmitted by the plurality of transmission areas. The positions of the laser beams transmitted by the plurality of transmission regions irradiated on the second lens group are symmetrical with respect to the optical axis of the second lens group. The fluorescent wheel is positioned at one side of the second lens group far away from the light combining component. The fluorescent wheel includes a first region and a second region. The first region is configured to reflect the laser beam condensed by the second lens group to the second lens group. The second region is configured to be excited to generate fluorescence upon irradiation of a laser beam condensed by the second lens group. Along with the rotation of the fluorescent wheel, the laser beams converged by the second lens group respectively irradiate the first area and the second area, and the laser beams reflected by the first area and the fluorescent light emitted by the second area respectively enter the light combining component through the second lens group and are reflected to the light outlet of the light source component through the light combining component. The laser beam and the fluorescence emitted from the light outlet of the light source assembly form the illumination beam.

Drawings

FIG. 1 is a block diagram of a laser projection device according to some embodiments;

FIG. 2 is a partial block diagram of a laser projection device according to some embodiments;

FIG. 3 is an optical path diagram of a light source assembly, an optical engine, and a lens in a laser projection device according to some embodiments;

FIG. 4 is another optical path diagram of a light source assembly, an optical engine, and a lens in a laser projection device according to some embodiments;

FIG. 5 is a diagram of an arrangement of micro-mirror plates in a digital micromirror device according to some embodiments;

FIG. 6 is yet another optical path diagram of a light source assembly, an optical engine, and a lens in a laser projection device according to some embodiments;

Fig. 7 is a structural view of a light source assembly in the related art;

FIG. 8 is a block diagram of another related art light source assembly;

FIG. 9 is a block diagram of a light source assembly according to some embodiments;

FIG. 10 is a block diagram of a light combining component according to some embodiments;

FIG. 11 is a block diagram of another light source assembly according to some embodiments;

FIG. 12 is a block diagram of another light combining component according to some embodiments;

FIG. 13 is a block diagram of yet another light combining component according to some embodiments;

FIG. 14 is a block diagram of yet another light combining component according to some embodiments;

FIG. 15 is a block diagram of yet another light combining component according to some embodiments;

FIG. 16 is a block diagram of yet another light source assembly according to some embodiments;

FIG. 17 is a block diagram of yet another light combining component according to some embodiments;

FIG. 18 is a block diagram of a fluorescent wheel according to some embodiments;

FIG. 19 is another block diagram of a fluorescent wheel according to some embodiments;

FIG. 20 is a block diagram of yet another light source assembly according to some embodiments;

FIG. 21 is a block diagram of a light combining component and fly's eye lens in a light source assembly according to some embodiments;

FIG. 22 is a schematic illustration of spots formed when a laser beam impinges on a fly eye lens according to some embodiments;

FIG. 23 is a block diagram of yet another light source assembly according to some embodiments;

FIG. 24 is another block diagram of a light combining component and fly's eye lens in a light source assembly according to some embodiments;

fig. 25 is a block diagram of yet another light source assembly according to some embodiments.

Reference numerals illustrate:

A laser projection device 1; a light source assembly 10'; a laser 101'; a light combining component 103'; a light-converging lens 1031'; a reflective lens 1032'; fluorescent wheel 105'; a light outlet 109'; a light source assembly 10; a laser 101; a first laser 1011; a second laser 1012; a first lens group 102; a convex lens 102A; a concave lens 102B; a first sub-lens group 1021; a second sub-lens group 1022; a light combining member 103; a reflective region 1031; a first reflective area 1031A; a second reflective area 1031B; a third reflective area 1031C; a transmissive region 1032; a first transmissive region 1032A; a second transmissive region 1032B; a transmission section 1033; a reflection section 1034; a reflective surface 1035; a cylindrical lens 1036; a first substrate 1030; a dichroic film 1037; a reflective film 1038; a through hole 1039; an antireflection film 1040; a second lens group 104; a third sub-lens 1041; fourth sub-lens 1042; a fluorescent wheel 105; a first region 1051; a second region 1052; a first sub-fluorescent region 1052A; a second sub-fluorescent region 1052B; a second substrate 1050; a first reflective layer 1053; a fluorescent material layer 1054; a second reflective layer 1055; a fly-eye lens 106; a substrate 1061; microlenses 1062; turning mirror group 107; a first mirror group 1071; a first mirror 1071A; a second mirror 1071B; a second mirror group 1072; a third mirror 1072A; a fourth mirror 1072B; a third lens group 108; a light outlet 109; a light machine 20; a light pipe 210; a plane mirror 220; a lens assembly 230; a prism assembly 240; a digital micromirror device 250; a minute reflection mirror 2501; a lens 30; a complete machine housing 40.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by one of ordinary skill in the art based on the embodiments provided by the present disclosure are within the scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the specification, the terms "one embodiment", "some embodiments (some embodiments)", "exemplary embodiment (exemplary embodiments)", "example (example)", "specific example (some examples)", etc. are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

In describing some embodiments, the expression "connected" and its derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. However, the term "coupled" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited to the disclosure herein.

"A and/or B" includes the following three combinations: only a, only B, and combinations of a and B.

The use of "adapted" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

As used herein, "about," "approximately" or "approximately" includes the stated values as well as average values within an acceptable deviation range of the particular values as determined by one of ordinary skill in the art in view of the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system).

As used herein, "parallel", "perpendicular", "equal" includes the stated case as well as the case that approximates the stated case, the range of which is within an acceptable deviation range as determined by one of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system).

Fig. 1 is a block diagram of a laser projection device according to some embodiments. Some embodiments of the present disclosure provide a laser projection device 1. As shown in fig. 1, the laser projection device 1 includes a complete machine housing 40 (only a part of the housing 40 is shown in fig. 1), a light source assembly 10, a light machine 20, and a lens 30, which are assembled in the housing 40. The light source assembly 10 is configured to provide an illumination beam (laser beam). The light engine 20 is configured to modulate an illumination beam provided by the light source assembly 10 with an image signal to obtain a projection beam. The lens 30 is configured to project a projection beam onto a screen or wall for imaging.

The light source assembly 10, the optical machine 20 and the lens 30 are sequentially connected along the light beam propagation direction, and are respectively wrapped by corresponding shells. The respective housings of the light source assembly 10, the light engine 20 and the lens 30 support the respective optical components and allow the respective optical components to meet certain sealing or airtight requirements.

Fig. 2 is a partial block diagram of a laser projection device according to some embodiments. As shown in fig. 2, one end of the light machine 20 is connected to the light source assembly 10, and the light source assembly 10 and the light machine 20 are disposed along the emission direction (refer to the M direction in fig. 2) of the illumination beam of the laser projection apparatus 1. The other end of the optical machine 20 is connected to the lens 30, and the optical machine 20 and the lens 30 are disposed along the emission direction (refer to the N direction shown in fig. 2) of the projection beam of the laser projection device 1. The emitting direction M of the illumination beam is approximately perpendicular to the emitting direction N of the projection beam, and the connecting structure can adapt to the light path characteristics of the reflective light valve in the optical machine 20 on one hand, and is beneficial to shortening the length of the light path in one dimension direction and the structural arrangement of the whole machine on the other hand. For example, when the light source assembly 10, the optical engine 20, and the lens 30 are disposed in one dimension direction (e.g., M direction), the length of the optical path in the dimension direction is long, which is disadvantageous for the structural arrangement of the whole engine. The reflective light valve will be described later.

In some embodiments, the light source assembly 10 may provide trichromatic light (and may add other color light based on trichromatic light) in a time-sequential manner, and the human eye sees white light formed by mixing trichromatic light due to persistence of vision. Or the light source assembly 10 may output three primary colors of light simultaneously to continuously emit white light. The light source assembly 10 includes a laser that emits at least one color laser beam, such as a red, blue, or green laser beam.

Fig. 3 is an optical path diagram of a light source assembly, an optical engine, and a lens in a laser projection apparatus according to some embodiments, and fig. 4 is another optical path diagram of a light source assembly, an optical engine, and a lens in a laser projection apparatus according to some embodiments.

The illumination beam from the light source assembly 10 enters the light engine 20. Referring to fig. 3 and 4, the light engine 20 includes a light pipe 210, a flat mirror 220, a lens assembly 230, a prism assembly 240, and a digital micromirror device (Digital Micromirror Device, DMD) 250. The light pipe 210 receives and homogenizes the illumination beam provided by the light source assembly 10. Furthermore, the exit of the light pipe 210 may be rectangular, thereby providing a shaping effect on the spot. The plane mirror 220 may reflect the illumination beam to the lens assembly 230. The lens assembly 230 may converge the illumination beam to the prism assembly 240. The prism assembly 240 reflects the illumination beam to the digital micromirror device 250, modulates the illumination beam to obtain a projection beam, and reflects the projection beam into the lens 30. Of course, the light guide 210 may be replaced by a fly eye lens or other components having a light homogenizing function, which is not limited in this disclosure.

In some embodiments, the light pipe 210 includes a first light pipe or a second light pipe. The first light pipe is a tubular device formed by splicing four plane reflecting sheets, and the inside of the first light pipe is hollow. The laser beam is reflected multiple times inside the first light guide and thus homogenized. The second light guide may be made of quartz, and the second light guide transmits and homogenizes the laser beam by causing the laser beam to generate total reflection inside the second light guide.

In the optical machine 20, the digital micromirror device 250 modulates the illumination beam provided by the light source assembly 10 with the image signal, namely: the projection beam is controlled to display different brightness and gray levels for different pixels of the image to be displayed to ultimately form an optical image, and thus the digital micromirror device 250 is also referred to as a light modulation device or light valve. The light modulation device (or light valve) may be classified as either a transmissive light modulation device or a reflective light modulation device depending on whether the light beam is transmitted or reflected by the light modulation device. For example, the digital micromirror device 250 shown in fig. 4 reflects an illumination beam, i.e., a reflective light modulation device. The liquid crystal light valve transmits the illumination beam, so that the liquid crystal light valve is a transmission type light modulation device. Further, the light engine 20 may be classified into a single-chip system, a two-chip system, or a three-chip system according to the number of light modulation devices used in the light engine 20. The light modulation device in some embodiments of the present disclosure is a digital micromirror device 250.

Fig. 5 is a diagram of an arrangement of micro mirror plates in a digital micromirror device according to some embodiments.

As shown in fig. 5, the digital micromirror device 250 includes thousands of tiny mirrors 2501 that can be individually driven to rotate, the tiny mirrors 2501 are arranged in an array, and one tiny mirror 2501 (e.g., each tiny mirror 2501) corresponds to one pixel in a projection screen to be displayed. The image signal can be converted into digital codes such as 0 and 1 after processing, and in response to these digital codes, the micro mirror 2501 can be swung. The time for which each micro mirror 2501 is in the on state and the off state respectively is controlled to realize the gray scale of each pixel in one frame image. In this way, the digital micromirror device 250 can modulate the illumination beam, thereby realizing the display of the projection screen. The on state of the micro mirror 2501 is a state in which the micro mirror 2501 is in a state in which the illumination beam emitted from the light source module 10 is reflected by the micro mirror 2501 and can enter the lens 30. The off state of the micro mirror 2501 is a state in which the micro mirror 2501 is in a state that can be maintained when the illumination beam emitted from the light source module 10 is reflected by the micro mirror 2501 and does not enter the lens 30.

Fig. 6 is yet another optical path diagram of a light source assembly, an optical engine, and a lens in a laser projection device according to some embodiments. In some embodiments, as shown in fig. 6, the lens 30 includes a plurality of lens combinations, generally divided by groups, into front, middle and rear three-stage types, or front and rear two-stage types. The front group is a lens group near the light emitting side of the laser projection device 1 (i.e., the side of the lens 30 away from the optical engine 20 in the direction N in fig. 6), and the rear group is a lens group near the light emitting side of the optical engine 20 (i.e., the side of the lens 30 near the optical engine 20 in the direction opposite to the direction N in fig. 6). The lens 30 may be a zoom lens, or a fixed focus adjustable focus lens, or a fixed focus lens.

For ease of description, some embodiments of the present disclosure will be described primarily with respect to the light source assembly 10 outputting trichromatic light in a time-sequential manner, and the light modulation device in the light engine 20 being a digital micromirror device 250, however, this should not be construed as limiting the present disclosure.

Fig. 7 is a structural view of a light source assembly in the related art. Fig. 8 is a structural view of another light source assembly in the related art. Generally, as shown in fig. 7, the light source assembly 10 'includes a laser 101', a light combining assembly 103', and a fluorescent wheel 105'. The laser 101' is configured to emit a laser beam. The light combining unit 103' includes a light combining lens 1031' and a reflecting lens 1032'. The light-converging lens 1031 'is configured to transmit the laser light beam emitted from the laser 101' to the fluorescent wheel 105 'and reflect the fluorescent light emitted from the fluorescent wheel 105'. The reflective sheet 1032 'is located at a side of the light-converging sheet 1031' away from the fluorescent wheel 105 'and configured to reflect the laser light beam reflected by the fluorescent wheel 105'. The fluorescent wheel 105' is configured to reflect the laser beam transmitted by the light-converging lens 1031' and to be excited by the laser beam transmitted by the light-converging lens 1031' to emit fluorescence under irradiation of the laser beam.

The fluorescence emitted from the fluorescent wheel 105 'and the reflected laser beam are incident on the light-converging lens 1031'. The light combining lens 1031' reflects the fluorescence to the light outlet 109' of the light source assembly 10', and transmits the laser beam reflected by the fluorescent wheel 105' to the reflecting lens 1032'. The reflection lens 1032' reflects the laser beam transmitted through the light combining lens 1031' to the light combining lens 1031' again, and the laser beam reflected through the reflection lens 1032' passes through the light combining lens 1031' for the third time and is incident on the light outlet 109' of the light source assembly 10 '.

In the light source module 10', the laser beam emitted from the laser 101' is transmitted through the light-converging lens 1031' three times. The transmittance of the light-transmitting lens 1031' for light is about 96% to 97%. After the laser beam passes through the light-combining lens 1031' three times, the transmittance of the light-combining lens 1031' to the laser beam is about (96%) ³ ≡88%, resulting in a high optical loss of the light source module 10 '.

In addition, as shown in fig. 8, in the case where the fluorescent wheel 105' includes a laser light transmitting region and the light combining module 103' includes only the light combining lens 1031', a relay circuit composed of at least 3 reflecting lenses 1001', 1002' and 1003' needs to be additionally provided so as to reflect the laser light beam passing through the laser light transmitting region of the fluorescent wheel 105' to the light outlet 109' of the light source module 10 '. The use of such a relay circuit would increase the number of optical elements of the light source assembly 10', which would be disadvantageous for the miniaturization of the light source assembly 10'.

Some embodiments of the present disclosure provide a light source assembly 10. The light source assembly 10 solves the above-described problems by providing a light combining member 103 having a reflective region 1031 and a transmissive region 1032. The light combining member 103 having the reflective region 1031 and the transmissive region 1032 will be described later.

Fig. 9 is a block diagram of a light source assembly according to some embodiments, and fig. 10 is a block diagram of a light combining member according to some embodiments. In some embodiments, as shown in fig. 9, the light source assembly 10 includes a laser 101, a light combining member 103, and a fluorescent wheel 105. The laser 101, the light combining member 103, and the fluorescent wheel 105 are sequentially arranged in the second direction Y. The laser 101 is configured to emit a laser beam. For example, the laser 101 may emit a blue laser beam. It should be noted that fig. 9 only illustrates an example in which the light source assembly 10 includes one laser 101, and of course, the light source assembly 10 may include a plurality of lasers 101.

The light combining member 103 is located on the light emitting side of the laser 101, and is disposed obliquely with respect to the light emitting direction (e.g., the second direction Y in fig. 9) of the laser 101. For example, as shown in fig. 9, an angle θ between the light emitting direction of the laser 101 and the light combining member 103 is an acute angle. Thus, the light combining member 103 can reflect the incident laser beam and fluorescence in the first direction X. It should be noted that, the present disclosure is described by taking the first direction X and the second direction Y as examples, and of course, some embodiments of the present disclosure are not limited thereto. For example, the angle between the first direction X and the second direction Y may be an obtuse angle or an acute angle.

In some embodiments, the included angle θ between the light combining component 103 and the light emitting direction of the laser 101 is 45 °, so that the fluorescent wheel 105 is disposed around the light combining component 103, and the fluorescent light and the laser light beam from the fluorescent wheel 105 are reflected to the light emitting port 109 of the light source assembly 10.

In some embodiments, as shown in fig. 9 and 10, the light combining means 103 includes a reflective region 1031 and a transmissive region 1032. The reflective region 1031 is configured to reflect the incident laser light beam and fluorescence. The transmissive region 1032 is configured to transmit the laser light beam emitted by the laser 101. Of course, the reflective region 1031 may reflect light (laser beam or fluorescence) having a color different from that of the laser beam and the fluorescence, which is not limited in the present disclosure.

In some embodiments, the shape of the transmissive region 1032 is the same as the shape of the spot of the laser beam emitted by the laser 101 on the light combining member 103. In this way, the size of the transmissive region 1032 can be minimized without affecting the transmission of the laser beam emitted by the laser 101 through the transmissive region 1032. In addition, the reflective region 1031 has an area larger than that of the transmissive region 1032 so that the reflective region 1031 reflects the laser light beam reflected by the fluorescent wheel 105 and the fluorescent light emitted from the fluorescent wheel 105.

In some embodiments, the transmissive region 1032 is also configured to reflect fluorescent light of a different color than the laser beam emitted by the laser 101. As shown in fig. 10, the light combining member 103 includes a transmission portion 1033, and the transmission portion 1033 is located in the transmission region 1032. The transmitting portion 1033 is configured to transmit the laser light beam emitted from the laser 101 and reflect the fluorescent light emitted from the fluorescent wheel 105. For example, the transmission unit 1033 is a dichroic mirror (Dichroic Mirror) that can transmit the blue laser beam and reflect the red fluorescence and the green fluorescence when the laser 101 emits the blue laser beam and the fluorescent wheel 105 emits the red fluorescence and the green fluorescence. Thus, the utilization ratio of fluorescence can be improved, and light loss caused by that a part of fluorescence is prevented from transmitting through the transmission region 1032.

In some embodiments, as shown in fig. 10, the light combining component 103 includes a reflective portion 1034, where the reflective portion (e.g., a mirror) 1034 is located in the reflective area 1031. The reflecting portion 1034 is configured to reflect fluorescence emitted from the fluorescent wheel 105 and the laser beam reflected by the fluorescent wheel 105. The reflecting portion 1034 may be fixedly connected to the transmitting portion 1033.

In the case where the light combining member 103 includes the transmitting portion 1033 and the reflecting portion 1034, the laser light beam emitted from the laser 101 is transmitted through the transmitting portion 1033 in the transmitting zone 1032 and is irradiated onto the fluorescent wheel 105. The laser beam emitted from the laser 101 is reflected by the fluorescent wheel 105 to the light combining member 103, and is reflected by the reflecting portion 1034 to the light outlet 109 of the light source module 10. The fluorescence excited by the fluorescence wheel 105 is incident on the light combining member 103, and is reflected by the reflection portion 1034 and the transmission portion 1033 to the light outlet 109 of the light source module 10, so that the fluorescence is incident on the light machine 20 as an illumination light beam of the light source module 10.

Fig. 11 is a block diagram of another light source assembly according to some embodiments. The shapes of the reflective portion 1034 and the transmissive portion 1033 in fig. 11 are changed as compared to fig. 9 and 10. In some embodiments, as shown in fig. 11, the reflective portion 1034 includes a reflective surface 1035, the reflective surface 1035 is a surface of the reflective portion 1034 opposite to the fluorescent wheel 105, and the reflective surface 1035 is curved. In this case, the reflective surface 1035 is configured to collect the fluorescence and the laser light beam from the fluorescent wheel 105 and reflect the fluorescence and the laser light beam to the light outlet 109 of the light source assembly 10.

In some embodiments, the reflective surface 1035 may be a straight curved surface, or a curved surface. The straight curved reflective surface may converge the incident laser beam or fluorescence in one dimension (e.g., parallel to the second direction Y). The curved reflective surface may converge the incident laser beam or fluorescence in two dimensions. The straight curved surface refers to a curved surface, such as a cylindrical surface, in which at least one straight line passes through any point on the curved surface. The curved surface refers to a curved surface, such as a spherical surface, in which the generatrix is curved.

In some embodiments, as shown in fig. 11, the transmissive portion 1033 includes a cylindrical lens 1036 (CYLINDRICAL LENS), the cylindrical lens 1036 being located in the transmissive region 1032. The cylindrical lens 1036 is fixedly connected to the reflecting portion 1034, and is configured to transmit the laser beam emitted from the laser 101. The central axis of the cylindrical lens 1036 is parallel to the second direction Y. Thus, the laser beam emitted from the laser 101 may be perpendicularly incident on the cylindrical lens 1036, and perpendicularly incident on the fluorescent wheel 105 after passing through the cylindrical lens 1036. Of course, the cylindrical lens 1036 may be replaced by a lens having another shape, so long as the laser beam emitted from the laser 101 is transmitted through the transmission portion 1033 and then vertically incident on the fluorescent wheel 105.

The above description mainly uses the light combining member 103 as a separate member. Of course, in some embodiments, the light combining component 103 may be a single piece.

Fig. 12 is a block diagram of another light combining component according to some embodiments. Fig. 13 is a block diagram of yet another light combining component according to some embodiments. In comparison with fig. 10, the light combining member 103 in fig. 12 and 13 is a single piece. For example, as shown in fig. 12, the light combining member 103 includes a first substrate 1030, a dichroic film 1037, and a reflective film 1038. The first substrate 1030 may employ a transparent substrate. A dichroic film 1037 and a reflective film 1038 are provided on the first substrate 1030, respectively, and the dichroic film 1037 is located in the transmissive region 1032 and the reflective film 1038 is located in the reflective region 1031. The reflective film 1038 is configured to reflect incident fluorescent light and laser light beams. For example, the reflective film 1038 may reflect the laser beam and fluorescence in the full wavelength band. The dichroic film 1037 is configured to transmit the laser light beam emitted from the laser 101, and reflect the fluorescence emitted from the fluorescent wheel 105. Thus, the light combining member 103 can have both transmission and reflection functions. The dichroic film 1037 may reflect fluorescence of another color or a laser beam having a color different from that of the laser beam emitted from the laser 101.

As another example, as shown in fig. 13, the light combining member 103 includes a through hole 1039 in addition to the first substrate 1030 and the reflective film 1038. The via 1039 is disposed on the first substrate 1030, and the via 1039 is located in the transmissive region 1032. The via 1039 is configured to transmit the laser beam emitted from the laser 101. In this way, the light combining member 103 can be made to have both the transmission and reflection functions, and the dichroic film 1037 can be omitted, saving the material of the light combining member 103, and simplifying the manufacturing process of the light combining member 103. In the case where the light combining member 103 includes the through hole 1039, the transmission region 1032 can transmit the laser beam and fluorescence in the entire wavelength band. Of course, the light combining member 103 may not include the through hole 1039, as long as the portion of the first substrate 1030 located in the transmission region 1032 is a transparent substrate, and may transmit the laser beam and fluorescence in the full wavelength band.

Fig. 14 is a block diagram of yet another light combining component according to some embodiments, and fig. 15 is a block diagram of yet another light combining component according to some embodiments. Compared to fig. 12, fig. 14 and 15 add an antireflection film 1040.

In some embodiments, as shown in fig. 14 and 15, the light combining component further includes an antireflection film 1040. The antireflection film 1040 is disposed on a surface of the light combining member 103 near the laser 101, and the antireflection film 1040 is configured to increase the transmittance of the light combining member 103 to the laser beam. For example, the antireflection film 1040 only increases the transmittance of the laser light beam (e.g., blue laser light beam) emitted from the laser 101; or the antireflection film 1040 may increase the transmittance of the laser beam and fluorescence in the full wavelength band.

In some embodiments, as shown in fig. 14, an antireflection film 1040 is provided on and covers the surface of the light combining member 103 near the laser 101. Alternatively, as shown in fig. 15, the antireflection film 1040 may be provided only on the surface of the light combining member 103 located in the transmission region 1032. Thus, the loss of the laser beam can be reduced, and the utilization rate of the laser beam can be improved.

In some embodiments, the light combining component 103 further comprises a light diffusing structure. The light diffusing structure is disposed on a surface of the light combining member 103 near the laser 101. For example, the light diffusion structure is a diffusion sheet, or the light diffusion structure is a structure composed of a plurality of microprisms (such as trapezoidal prisms, triangular prisms or right angle prisms, etc.), or the light diffusion structure is a structure composed of a plurality of parallel strip-shaped protrusions. The light diffusing structure is configured to diffuse the laser beam incident on the light combining member 103 to improve uniformity of the laser beam transmitted from the light combining member 103. Thus, after the laser beam irradiates the fluorescent wheel 105, the energy distribution of the fluorescent light excited by the fluorescent wheel 105 is relatively uniform.

In some embodiments, as shown in fig. 9, the light combining means 103 comprises only one transmissive region 1032. The transmission region 1032 is located at the center of the light combining member 103, and the reflection region 1031 is disposed around the transmission region 1032.

Of course, the light combining member 103 in some embodiments of the present disclosure is not limited thereto. In some embodiments, the light combining member 103 may further include a plurality of transmissive regions 1032, and the plurality of transmissive regions 1032 are spaced apart.

Fig. 16 is a block diagram of yet another light source assembly according to some embodiments. Fig. 17 is a block diagram of yet another light combining component according to some embodiments. Fig. 16 and 17 increase the number of the transmissive sections 1032 as compared to fig. 9. For example, as shown in fig. 16 and 17, the plurality of transmissive regions 1032 includes a first transmissive region 1032A and a second transmissive region 1032B. The reflective region 1031 is located between the first transmissive region 1032A and the second transmissive region 1032B, and the first transmissive region 1032A is located on a side of the reflective region 1031 closer to the laser 101, and the second transmissive region 1032B is located on a side of the reflective region 1031 farther from the laser 101. The structure and function of the plurality of transmissive regions 1032 are the same as the transmissive regions 1032 and are not described in detail herein.

In some embodiments, where the light combining member 103 includes a plurality of transmissive regions 1032, the light combining member 103 may include a plurality of transmissive portions 1033, or a plurality of dichroic films 1037, or a plurality of through holes 1039. For example, the light combining member 103 includes two transmissive sections 1033, and the two transmissive sections 1033 are located in the first transmissive section 1032A and the second transmissive section 1032B, respectively. Or the light combining member 103 includes a first substrate 1030 and a reflective film 1038 and two dichroic films 1037 on the first substrate 1030. Two dichroic films 1037 are located in the first and second transmissive regions 1032A and 1032B, respectively, and a reflective film 1038 is located in the reflective region 1031. Or the light combining member 103 includes a first substrate 1030, a reflective film 1038 and two through holes 1039 on the first substrate 1030. The two through holes 1039 are located in the first and second transmissive regions 1032A and 1032B, respectively, and the reflective film 1038 is located in the reflective region 1031.

In order that the laser light beams emitted from the laser 101 may be respectively incident on the plurality of transmission regions 1032, in some embodiments, as shown in fig. 16, the light source assembly 10 further includes a turning mirror group 107. The turning mirror group 107 is located between the light combining part 103 and the laser 101, and is configured to split the laser beam emitted from the laser 101 to divide the laser beam into a plurality of laser beams, and to make the plurality of laser beams correspond to the plurality of transmission zones 1032.

For example, as shown in fig. 16, the turning mirror group 107 includes a first mirror group 1071 and a second mirror group 1072. The first mirror group 1071 and the second mirror group 1072 reflect the laser light beam emitted from the laser 101 to the first transmission region 1032A and the second transmission region 1032B, respectively. For example, the laser 101 includes a plurality of laser chips arranged in an array, each of which can emit a laser beam. The first mirror group 1071 includes a first mirror 1071A and a second mirror 1071B, the first mirror 1071A reflects the laser light beam emitted from a part of the laser chips in the laser 101 to the second mirror 1071B, and the second mirror 1071B reflects the incident laser light beam to the first transmission region 1032A.

The second mirror group 1072 includes a third mirror 1072A and a fourth mirror 1072B, the third mirror 1072A reflects the laser beam emitted from another part of the laser chips in the laser 101 to the fourth mirror 1072B, and the fourth mirror 1072B reflects the incident laser beam to the second transmission region 1032B. In this way, the laser beam emitted from the laser 101 can be split into two laser beams to be incident on the first transmission region 1032A and the second transmission region 1032B, respectively.

Of course, the light source assembly 10 in some embodiments of the present disclosure is not limited thereto. In some embodiments, the light source assembly 10 may also include a plurality of lasers 101, where the plurality of lasers 101 correspond to the plurality of transmissive regions 1032, such that a plurality of laser beams emitted by the plurality of lasers 101 may be respectively incident on the plurality of transmissive regions 1032.

FIG. 18 is a block diagram of a fluorescent wheel according to some embodiments, and FIG. 19 is another block diagram of a fluorescent wheel according to some embodiments. In some embodiments, as shown in fig. 9, the fluorescent wheel 105 is located on a side of the light combining member 103 away from the laser 101, and the fluorescent wheel 105 is configured to reflect the laser light beam transmitted by the light combining member 103 and to be excited to emit fluorescent light under irradiation of the laser light beam. For example, as shown in fig. 18, the fluorescent wheel 105 includes a first region 1051 and a second region 1052. The first region 1051 is configured to reflect the laser beam transmitted by the light combining member 103. The second region 1052 is configured to be excited to emit fluorescence upon irradiation of the laser beam transmitted by the light combining member 103. The color of the fluorescence generated by the fluorescent wheel 105 is different from the color of the laser beam emitted by the laser 101.

In some embodiments, as shown in fig. 18 and 19, the light source assembly 10 further includes a rotational axis Z. The fluorescent wheel 105 can rotate around the rotation axis Z. For example, as shown in fig. 18, the fluorescent wheel 105 may be rotated in the W direction or the reverse direction of the W direction about the rotation axis Z. During rotation of the fluorescent wheel 105, the laser beam emitted by the laser 101 may impinge on different regions (e.g., the first region 1051 and the second region 1052) in the fluorescent wheel 105 after passing through the transmissive region 1032.

When the laser beam transmitted through the transmission region 1032 is incident on the first region 1051 of the fluorescent wheel 105, the first region 1051 reflects the laser beam, and the laser beam reflected by the first region 1051 is incident on the reflection region 1031 of the light combining member 103. When the laser beam transmitted through the transmission region 1032 is incident on the second region 1052 in the fluorescent wheel 105, the second region 1052 is excited by the laser beam to emit fluorescence, and the fluorescence is incident on the reflection region 1031 of the light combining member 103. The reflection area 1031 of the light combining member 103 reflects the incident laser beam and fluorescent light to the light outlet 109 of the light source assembly 10 along the first direction X.

In some embodiments, the side of the fluorescent wheel 105 remote from the light combining member 103 is opaque. When the second region 1052 is excited to emit fluorescence, the fluorescence is emitted in various directions in the form of a lambertian body. In this case, by making the side of the fluorescent wheel 105 away from the light combining member 103 opaque, the light emission angle of the fluorescent light emitted from the second region 1052 can be made substantially within the range of 0 ° to 180 °. The lambertian body may be a light-emitting body that emits light isotropically around.

In some embodiments, the fluorescent wheel 105 includes a reflective material and at least one fluorescent material. The reflective material is located in the first region 1051 and can reflect an incident laser beam. The fluorescent material is located in the second region 1052, and the fluorescent material may be excited to emit fluorescence under irradiation of a laser beam. For example, as shown in fig. 19, the fluorescent wheel 105 includes a second substrate 1050, a first reflective layer 1053, and a fluorescent material layer 1054. The first reflective layer 1053 and the fluorescent material layer 1054 are respectively disposed on the surface of the second substrate 1050 near the light combining member 103, and the first reflective layer 1053 is located in the first region 1051 of the fluorescent wheel 105, and the fluorescent material layer 1054 is located in the second region 1052 of the fluorescent wheel 105. The second substrate 1050 may be a transparent substrate or a reflective substrate. In the case where the second substrate 1050 is a reflective substrate, the surface of the second substrate 1050 in the first region 1051 may not be provided with any material layer (such as the first reflective layer 1053). The fluorescent material layer 1054 of one color may be excited to emit fluorescent light of the one color.

When the laser beam is incident on the first region 1051, the laser beam may be reflected by the first reflective layer 1053. When the laser beam is incident on the second region 1052, the laser beam can excite the fluorescent material layer 1054 to emit fluorescent light of a corresponding color.

In some embodiments, the first reflective layer 1053 employs a diffuse reflective material. The diffuse reflection material may diffuse the laser beam transmitted through the transmissive region 1032 to the light combining member 103 to homogenize the incident laser beam. The fluorescent material layer 1054 employs a green fluorescent material, or the fluorescent material layer 1054 may employ at least one of a red fluorescent material or a yellow fluorescent material. Thus, the second region 1052 may fluoresce green, red, or other colors (e.g., yellow).

In some embodiments, the second region 1052 includes at least one sub-fluorescent region, each sub-fluorescent region being provided with a layer of fluorescent material of one color. When the second region 1052 includes a plurality of sub-fluorescent regions, the plurality of sub-fluorescent regions and the first region 1051 may be circumferentially arranged around the rotation axis Z. For example, as shown in fig. 18, second region 1052 includes a first sub-fluorescent region 1052A and a second sub-fluorescent region 1052B. In this case, the fluorescent material layer 1054 may use any two of a green fluorescent material, a yellow fluorescent material, or a red fluorescent material. Phosphor material layers 1054 using different phosphor materials are respectively located in the first and second sub-phosphor regions 1052A and 1052B.

It should be noted that, in some embodiments of the present disclosure, the areas of the plurality of sub-fluorescent regions in the second region 1052 are equal, and the area of the first region 1051 is also equal to the area of any sub-fluorescent region. Of course, the areas of the plurality of sub-fluorescent regions and the first region 1051 may also be different, and the areas of the plurality of sub-fluorescent regions and the first region 1051 may be designed according to the duty ratio of the laser beam or fluorescence of the corresponding color in the white light to be obtained.

For example, in the case where the laser 101 emits a blue laser beam, the first sub-fluorescent region 1052A is made of a red fluorescent material, the second sub-fluorescent region 1052B is made of a green fluorescent material, and the rotation speed of the fluorescent wheel 105 is constant, if white light can be obtained after mixing the blue laser beam, the red fluorescent light, and the green fluorescent light in a ratio of 1:2:1, the area of the first region 1051 and the area of the second sub-fluorescent region 1052B are equal, and the area of the second sub-fluorescent region 1052B is half the area of the first sub-fluorescent region 1052A. Of course, the color of the laser beam emitted by the laser 101 and the fluorescence excited by the fluorescent wheel 105 may be other colors, which is not limited in this disclosure.

In some embodiments, as shown in fig. 19, the fluorescent wheel 105 further includes a second reflective layer 1055. The second reflective layer 1055 is located in the second region 1052 and is disposed between the fluorescent material layer 1054 and the second substrate 1050. The second reflective layer 1055 is configured to reflect fluorescence excited by the fluorescent material layer 1054. Since the fluorescence is emitted in the form of a lambertian body, the light emission angle is 360 °, and the second reflection layer 1055 is provided on one side of the fluorescent material layer 1054, the fluorescence emitted in the direction close to the second substrate 1050 can be reflected, so that the utilization rate of the fluorescence is improved, and the brightness of the fluorescence is improved.

In the light source assembly 10 of some embodiments of the present disclosure, the laser beam emitted by the laser 101 passes through the transmission region 1032 of the light combining member 103 only once, and compared with the case that the laser beam passes through the light combining lens 1031' multiple times in fig. 7, the number of times of passing through the light combining member 103 by the laser beam emitted by the laser 101 can be reduced, the light loss of the laser beam can be reduced, and the utilization rate of the laser beam in the light source assembly 10 can be improved. In addition, by arranging the light combining component 103 including the transmission region 1032 and the reflection region 1031, no relay loop system is required to be additionally arranged, so that optical elements of the light source assembly 10 are fewer, the light path architecture is compact, higher luminous power can be realized, and miniaturization of the light source assembly 10 is facilitated.

In some embodiments, as shown in fig. 9, the light source assembly 10 further includes a first lens group 102. The first lens group 102 is located between the laser 101 and the light combining member 103, and the first lens group 102 is configured to reduce a spot of a laser beam emitted from the laser 101. The first lens group 102 may make the beam of the laser beam exiting the first lens group 102 finer than the beam of the laser beam entering the first lens group 102. In this case, the size of the transmission region 1032 in the light combining member 103 may be smaller, which is advantageous for reducing the volume of the light combining member 103, or the size of the reflection region 1031 in the light combining member 103 may be larger in the case where the size of the light combining member 103 is fixed, so that the reflection region 1031 reflects more fluorescence and laser beams, thereby improving the utilization ratio of the fluorescence and laser beams.

In some embodiments, the first lens group 102 includes a convex lens 102A and a concave lens 102B. The convex lenses 102A and the concave lenses 102B are sequentially arranged in the second direction Y. In this way, the first lens group 102 can converge and diverge the laser beam emitted by the laser 101, so that the laser beam incident on the transmission area 1032 is parallel to the light emitting direction of the laser 101.

In some embodiments, as shown in fig. 9, the light source assembly 10 further includes a second lens group 104. The second lens group 104 is located between the light combining member 103 and the fluorescent wheel 105. The second lens group 104 is configured to condense the incident laser beam to the fluorescent wheel 105 and collimate the laser beam reflected by the fluorescent wheel 105 and the fluorescent light emitted from the fluorescent wheel 105.

For example, the second lens group 104 includes a third sub-lens 1041 and a fourth sub-lens 1042. The third sub-lens 1041 (e.g., a spherical convex lens or an aspherical convex lens) and the fourth sub-lens 1042 (e.g., a spherical convex lens or an aspherical convex lens) are disposed along the same optical axis and are sequentially arranged along the second direction Y. Since the second lens group 104 can collimate the laser beam reflected by the fluorescent wheel 105 and the fluorescence emitted by the fluorescent wheel 105, the laser beam and the fluorescence emitted by the fluorescent wheel 105 are collimated by the second lens group 104 in a manner similar to a lambertian body, and then can be emitted from the second lens group 104 in a manner of parallel light and enter the light combining member 103. The laser beam and the fluorescent light incident on the light combining member 103 may be incident on not only the reflective region 1031 but also the transmissive region 1032. In this case, the above-described transmissive section 1033 or dichroic film 1037 provided in the transmissive section 1032 can reflect the fluorescence incident on the transmissive section 1032, thereby improving the utilization ratio of the fluorescence.

In some embodiments, as shown in fig. 16, the light source assembly 10 further includes a third lens group 108. The light combining member 103 and the third lens group 108 are sequentially arranged in the first direction X, and the third lens group 108 is configured to combine the laser beam and the fluorescence reflected by the light combining member 103 and to enter the condensed laser beam and fluorescence into the light guide 210 through the light outlet 109 of the light source assembly 10. Note that fig. 16 illustrates an example in which the third lens group 108 includes one lens. Of course, the third lens group 108 may also include a plurality of lenses.

Fig. 20 is a block diagram of yet another light source assembly according to some embodiments, and fig. 21 is a block diagram of a light combining member and fly's eye lens in the light source assembly according to some embodiments. Fig. 22 is a schematic view of spots formed when a laser beam is irradiated onto a fly-eye lens according to some embodiments. Fig. 20 adds fly-eye lens 106 as compared to fig. 9.

In some embodiments, as shown in fig. 20 and 21, the light source assembly 10 further includes a fly eye lens 106. The fly-eye lens 106 is disposed on the light combining member 103 and is located in the transmission zone 1032 of the light combining member 103. Fly eye lens 106 is configured to homogenize and shape the laser beam emitted by laser 101.

In some embodiments, as shown in fig. 20 and 22, fly-eye lens 106 includes a substrate 1061 and a plurality of Micro-lenses (Micro-lenses) 1062. The substrate 1061 may be a glass substrate. A plurality of microlenses 1062 are disposed on the substrate 1061 and arranged in an array. The surface of the microlens 1062 remote from the substrate 1061 is curved. The length ratio of two adjacent sides of the orthographic projection of the curved surface on the substrate 1061 is a preset value, so that the light spot of the laser beam shaped by the microlenses 1062 matches the shape of the light inlet of the light guide 210.

For example, as shown in fig. 22, a spot R of one laser beam emitted from the laser 101 has an elliptical shape. When the positions of the lasers 101 are different, the positions of the spots R irradiated on the fly-eye lens 106 by the laser beams emitted from the lasers 101 are also different. For example, the direction of the major axis L of the elliptical spot R changes. The long axis L refers to the longest line segment that can be obtained by connecting any two points on the edge of the elliptical spot R.

The microlens 1062 may employ a plano-convex lens. The surface of the plano-convex lens close to the substrate 1061 is a plane, and the surface of the plano-convex lens away from the substrate 1061 is a curved surface. The orthographic projection of the curved surface on the substrate 1061 is rectangular. In this way, the plurality of microlenses 1062 can divide the incident light spot R of the laser beam into a plurality of rectangular light spots, and the plurality of rectangular light spots are converged into one rectangular light spot by the second lens group 104 and irradiated onto the light receiving surface 1056 of the fluorescent wheel 105, so as to homogenize and shape the laser beam emitted by the laser 101, so that the shapes of the light beam emitted from the light source assembly 10 and the light spot of the fluorescent light match the shape of the light inlet of the light guide 210 in the optical engine 20 (such as the light inlet of the light guide 210 is rectangular).

Of course, in some embodiments of the present disclosure, the microlenses 1062 in the fly-eye lens 106 may also be spherical convex lenses or aspherical convex lenses. In the case where the light combining member 103 includes the reflecting portion 1034 located in the reflecting area 1031, the reflecting portion 1034 may be fixedly connected to the fly-eye lens 106. Of course, as shown in fig. 11, the fly-eye lens 106 may be provided on the cylindrical lens 1036.

In some embodiments, the light source assembly 10 may also include a plurality of fly-eye lenses 106, the plurality of fly-eye lenses 106 corresponding to the plurality of transmissive regions 1032. Fig. 23 is a block diagram of yet another light source assembly according to some embodiments, and fig. 24 is another block diagram of a light combining member and fly's eye lens in the light source assembly according to some embodiments. Fig. 23 adds fly-eye lens 106 as compared to fig. 16. For example, as shown in fig. 23 and 24, the light source assembly 10 includes two fly-eye lenses 106, the two fly-eye lenses 106 being located in the first transmission region 1032A and the second transmission region 1032B, respectively. In this case, as shown in fig. 24, the light combining member 103 may further include a reflecting portion 1034. The reflective portion 1034 is located in the reflective area 1031. Here, the reflecting portion 1034 may be fixedly connected to the two fly-eye lenses 106.

The foregoing description mainly uses approximately parallel laser beams as the laser beams incident on the transmissive region 1032, but of course, some implementations of the disclosure are not limited thereto. In some embodiments, the first lens group 102 may converge the laser beam emitted by the laser 101 to the transmissive region 1032.

Fig. 25 is a block diagram of yet another light source assembly according to some embodiments. The spot of the laser beam incident on the transmission region 1032 in fig. 25 is smaller than that in fig. 9 and 16.

In some embodiments, as shown in fig. 25, the light source assembly 10 includes a plurality of lasers 101 and a plurality of first lens groups 102 in addition to the light combining member 103, the second lens group 104, and the fluorescent wheel 105. The plurality of lasers 101, the plurality of first lens groups 102, the light combining member 103, the second lens group 104, and the fluorescent wheel 105 are sequentially arranged along the second direction Y. The plurality of lasers 101 are arranged in sequence along the first direction X, and the plurality of lasers 101 are configured to emit a plurality of laser beams. For example, as shown in fig. 25, the plurality of lasers 101 includes a first laser 1011 and a second laser 1012. The first laser 1011 emits a first laser beam S1 and the second laser 1012 emits a second laser beam S2. The plurality of first lens groups 102 corresponds to the plurality of lasers 101, and the first lens groups 102 are configured to converge laser beams emitted from the lasers 101. For example, as shown in fig. 25, the plurality of first lens groups 102 includes a first sub-lens group 1021 and a second sub-lens group 1022. The first sub-lens group 1021 is located on the light-emitting side of the first laser 1011. The first laser beam S1 emitted from the first laser 1011 is incident on the first sub-lens group 1021, and is condensed to the light combining member 103 through the first sub-lens group 1021. The second sub-lens group 1022 is located on the light-emitting side of the second laser 1012. The second laser beam S2 emitted from the second laser 1012 is incident on the second sub-lens group 1022 and is condensed to the light combining member 103 via the second sub-lens group 1022.

In some embodiments, as shown in fig. 25, the light combining component 103 includes a plurality of reflective regions 1031 and a plurality of transmissive regions 1032. The plurality of reflective regions 1031 and the plurality of transmissive regions 1032 are alternately arranged, and the plurality of transmissive regions 1032 correspond to the plurality of first lens groups 102. The laser beam (e.g., the first laser beam S1 or the second laser beam S2) converged by the first lens group 102 is incident on the corresponding transmission region 1032, and is incident on the second lens group 104 through the corresponding transmission region 1032.

For example, as shown in fig. 25, the plurality of reflection regions 1031 includes a first reflection region 1031A, a second reflection region 1031B, and a third reflection region 1031C. The plurality of transmissive regions 1032 includes a first transmissive region 1032A and a second transmissive region 1032B. The first and second transmissive regions 1032A and 1032B are located between adjacent two reflective regions 1031, respectively. The first laser beam S1 condensed by the first sub-lens group 1021 is incident on the first transmission region 1032A, and is incident on the second lens group 104 through the first transmission region 1032A. The first laser beam S1 condensed by the second sub-lens group 1022 is incident on the second transmission region 1032B, and is incident on the second lens group 104 through the second transmission region 1032B. In the case where the light combining member 103 includes one reflecting portion 1034, the plurality of reflecting regions 1031 are different portions of the reflecting portion 1034. When the light combining member 103 includes a plurality of reflection portions 1034, the plurality of reflection regions 1031 correspond to the plurality of reflection portions 1034, respectively.

In some embodiments, as shown in fig. 25, the transmission zone 1032 in the light combining member 103 is located at the focal point (first focal point E and second focal point F) of the corresponding first lens group 102. The laser beam emitted from the laser 101 is converged to a focal point by the first lens group 102 and diverged after passing through the focal point. In this case, since the laser beam condensed by the first lens group 102 is condensed into one point at the transmission region 1032, the area of the region where the laser beam irradiates on the transmission region 1032 is small, and thus the light combining member 103 may include the transmission region 1032 of a small area. In this way, the area of the transmissive region 1032 can be minimized, reducing the light loss of the light source assembly 10.

In some embodiments, as shown in fig. 25, the laser beams transmitted through the transmission regions 1032 do not pass through the optical axis H of the second lens group 104, and the positions where the laser beams transmitted through the plurality of transmission regions 1032 are irradiated on the second lens group 104 are symmetrical with respect to the optical axis H of the second lens group 104. For example, the positions of the first laser beam S1 transmitted through the first transmission region 1032A and the second laser beam S2 transmitted through the second transmission region 1032B irradiated on the second lens group 104 are symmetrical with respect to the optical axis H of the second lens group 104.

For example, in the case where the sizes of the spots formed by the first laser beam S1 and the second laser beam S2 on the surface of the second lens group 104 near the light combining member 103 are the same, the spots formed by the two laser beams on the second lens group 104 are symmetrical with respect to the optical axis H of the second lens group 104. Or in the case where the two laser beams are different in the size of the spot formed on the second lens group 104, the center positions of the spots formed on the second lens group 104 by the two laser beams (the first spot center point C and the second spot center point D in fig. 25) are symmetrical with respect to the optical axis H of the second lens group 104. The irradiation position of the laser beam on the second lens group 104 may refer to all positions where the laser beam is irradiated on the second lens group 104, or may refer to a position where the main laser beam of the laser beam is irradiated on the second lens group 104. The main laser beam refers to a laser beam with the largest light intensity ratio in the laser beams.

Since the light emitting angle of the second area 1052 is large (0 ° to 180 °), the light spot formed on the second lens group 104 by the fluorescence emitted from the second area 1052 can cover the surface of the second lens group 104 close to the fluorescent wheel 105. Further, since the first laser beam S1 and the second laser beam S2 are symmetrical with respect to the optical axis H of the second lens group 104, the distance between the two laser beams is large. Accordingly, a spot formed on the second lens group 104 by the laser beam reflected by the first region 1051 may also substantially cover the surface of the second lens group 104 near the fluorescent wheel 105. In this way, the size difference between the laser beam reflected by the first area 1051 and the light spot formed on the second lens group 104 by the fluorescence emitted by the second area 1052 is smaller, so that the color uniformity of the light spot after the laser beam and the fluorescence are combined is improved.

Further, since the first laser beam S1 and the second laser beam S2 are converged by the first lens group 102, they diverge and are incident on the second lens group 104. Therefore, the spot size formed by the first laser beam S1 and the second laser beam S2 in the second lens group 104 is large. In this way, the size of the light spot formed on the first area 1051 of the fluorescent wheel 105 by the laser beam converged by the second lens group 104 is larger, so that the size of the light spot formed on the second lens group 104 by the laser beam reflected by the first area 1051 is increased, and the color uniformity of the light spot after the laser beam and the fluorescence are combined is further improved.

In some embodiments, the focal lengths of the plurality of first lens groups 102 are equal. For example, as shown in fig. 25, the first focal length F1 of the first sub-lens group 1021 is equal to the second focal length F2 of the second sub-lens group 1022. In this way, the laser beams emitted from the first laser 1011 and the second laser 1012 are converged by the corresponding first lens group 102, and then the divergence angles of the laser beams are substantially the same. The dimensions of the spots formed by the first laser beam S1 and the second laser beam S2 on the light combining member 103 are substantially the same, so that the symmetry of the first laser beam S1 and the second laser beam S2 in the whole optical path system, and the uniformity and symmetry of the illumination beam emitted by the light source assembly 10 are further improved.

In some embodiments, as shown in fig. 25, the third distance D3 between the second lens group 104 and the fluorescent wheel 105 is equal to the third focal distance F3 of the second lens group 104 in a direction parallel to the optical axis H of the second lens group 104. For example, the light receiving surface 1056 of the fluorescent wheel 105 is located at the focal plane of the second lens group 104. It should be noted that, the optical axis H of the second lens group 104 is parallel to the light emitting direction (e.g., the second direction Y) of the laser 101.

In some embodiments, the spacing between the plurality of first lens groups 102 and the second lens group 104 is different in a direction parallel to the optical axis H of the second lens group 104. For example, in a direction parallel to the optical axis H of the second lens group 104, a first pitch D1 between the first sub-lens group 1021 and the second lens group 104 is different from a second pitch D2 between the second sub-lens group 1022 and the second lens group 104. The distance between the first lens group 102 and the second lens group 104 refers to a distance between a principal plane of the first lens group 102 and a principal plane of the second lens group 104. The spacing between a lens and other components in this disclosure also refers to the spacing between the principal plane of the lens and other components. The principal plane refers to two conjugate planes having a vertical axis magnification (lateral magnification) equal to 1 in an ideal optical system.

In the case where the plurality of transmission regions 1032 in the light combining member 103 are located at the focal points of the corresponding first lens groups 102, respectively, and the focal lengths (e.g., the first focal length F1 and the second focal length F2) of the plurality of first lens groups 102 are equal, the pitch of the plurality of first lens groups 102 and the corresponding transmission regions 1032 is the same in the direction parallel to the optical axis H of the second lens group 104. In this case, since the light combining member 103 is disposed obliquely with respect to the optical axis H of the second lens group 104, the pitches of the plurality of transmission regions 1032 (e.g., the first transmission region 1032A and the second transmission region 1032B) in the light combining member 103 and the second lens group 104 are different in the direction parallel to the optical axis H of the second lens group 104, so that the pitches of the plurality of first lens groups 102 and the second lens group 104 are different.

In some embodiments, a pitch (e.g., the first pitch D1 or the second pitch D2) between any one of the plurality of first lens groups 102 and the second lens group 104 in a direction parallel to the optical axis H of the second lens group 104 is not equal to the third focal distance F3 of the second lens group 104.

For an optical system composed of two lenses, if the focal lengths of the two lenses are the fourth focal length F4 and the fifth focal length F5, respectively, and the fourth distance between the two lenses is D0, the sixth focal length F6 of the optical system composed of two lenses satisfies the formula (1):

As can be seen from the formula (1), when the fourth distance D0 between the two lenses is not equal to the fifth focal length F5 (i.e., d0+.f5), the sixth focal length F6 of the optical system is not equal to the fifth focal length F5 (i.e., f6+.f5). In this case, as shown in fig. 25, when the first distance D1 between the first sub-lens group 1021 and the second lens group 104, and the second distance D2 between the second sub-lens group 1022 and the second lens group 104 are not equal to the third focal length F3 of the second lens group 104 (i.e., d1+.f3, d2+.f3), the main focal length F0 of the optical system composed of the first lens group 102 and the second lens group 104 is not equal to the third focal length F3 (i.e., f0+.f3). Thus, when the laser beam emitted from the laser 101 is irradiated onto the focal plane of the second lens group 104 through the optical system, the spot of the laser beam is not converged into one point.

For example, as shown in fig. 25, a laser beam emitted from the laser 101 is incident on the first lens group 102, and is incident on the fluorescent wheel 105 through an optical system composed of the first lens group 102 and the second lens group 104. Since the main focal length F0 of the optical system composed of the first lens group 102 and the second lens group 104 is not equal to the third focal length F3 of the second lens group 104, the fluorescent wheel 105 located at the focal plane of the second lens group 104 is not located at the focal plane of the optical system. Thus, when two laser beams emitted from the two lasers 101 are condensed onto the fluorescent wheel 105 through the second lens group 104, the two laser beams form two spots, or form one larger spot, and the spots of the two laser beams do not converge into one spot.

Thus, the area of the laser beam irradiated on the fluorescent wheel 105 can be increased, so that the optical power density of the area of the fluorescent wheel 105 irradiated by the laser beam is reduced under the condition that the energy of the laser beam is unchanged, and the heat dissipation of the fluorescent wheel 105 is facilitated, so that the fluorescent wheel 105 has higher fluorescence excitation efficiency. The optical power density refers to the optical power incident per unit area. Also, in some embodiments of the present disclosure, since the area of the transmission region 1032 is smaller and the spot of the laser beam reflected by the first region 1051 of the fluorescent wheel 105 is larger, when the laser beam collimated by the second lens group 104 is incident on the light combining member 103, the laser beam transmitted from the transmission region 1032 is smaller, and the light loss of the light source assembly 10 is further reduced.

It should be noted that fig. 25 illustrates an example in which the first lens group 102 and the second lens group 104 each include only one lens (e.g., a convex lens). Of course, in some embodiments, the first lens group 102 and the second lens group 104 may also include a plurality of lenses, respectively, to enhance the converging effect of the first lens group 102 and the second lens group 104 on the laser beam. In this case, the focal length and focal point of the first lens group 102 and the second lens group 104 refer to those of a light system composed of a plurality of lenses. The pitch between the first lens group 102 and the second lens group 104 refers to the pitch between the light ray systems composed of a plurality of lenses. The position where the laser beam is irradiated on the second lens group 104 refers to a position where the laser beam is irradiated on a lens close to the laser 101 in the second lens group 104.

In some embodiments of the present disclosure, since the laser beams (e.g., the first laser beam S1 and the second laser beam S2) emitted from the light combining member 103 are symmetrical with respect to the optical axis H of the second lens group 104, the laser beams are uniformly distributed on the third lens group 108 after being reflected by the fluorescent wheel 105 and being incident on the third lens group 108 through the second lens group 104 and the light combining member 103. Thus, when the laser beam is incident to the light guide 210, the laser beam may be symmetrical about the central axis of the light inlet of the light guide 210, so that the reflection conditions of the laser beam on the upper and lower surfaces of the light guide 210 are approximately the same, the laser beam emitted from the light guide 210 is relatively uniform, the energy distribution difference between the laser beam and the fluorescence at the outlet of the light guide 210 is reduced, the color uniformity of the illumination beam emitted by the light source assembly 10 is improved, and the display effect of the projection picture is improved.

It will be understood by those skilled in the art that the scope of the present disclosure is not limited to the specific embodiments described above, and that certain elements of the embodiments may be modified and substituted without departing from the spirit of the application. The scope of the application is limited by the appended claims.

Claims

A laser projection device, comprising:

A light source assembly configured to emit an illumination beam;

An optical machine configured to modulate an illumination beam emitted by the light source assembly to obtain a projection beam; and

A lens configured to image the projection beam;

The light source assembly includes:

at least one laser configured to emit a laser beam;

the light combining component is located at the light emitting side of the at least one laser and is obliquely arranged relative to the light emitting direction of the at least one laser, and the light combining component comprises:

A reflection region configured to reflect an incident laser beam and fluorescence; and

At least one transmission region configured to transmit a laser beam emitted by the at least one laser; and

A fluorescent wheel located at a side of the light combining part away from the at least one laser, the fluorescent wheel comprising:

A first region configured to diffusely reflect the laser beam transmitted through the at least one transmission region to the light combining part; and

A second region configured to be excited to generate fluorescence under irradiation of a laser beam transmitted by the at least one transmission region;

Along with the rotation of the fluorescent wheel, the laser beams transmitted by the at least one transmission area respectively irradiate the first area and the second area, the laser beams reflected by the first area and the fluorescence emitted by the second area respectively enter the light combining component and are reflected to the light outlet of the light source component through the light combining component, and the laser beams and the fluorescence emitted from the light outlet of the light source component form the illumination beams.
The laser projection device of claim 1, wherein the at least one transmissive region comprises a transmissive region, the transmissive region is centered on the light combining means, and the reflective region is disposed around the transmissive region.
The laser projection device of claim 1, wherein the at least one transmissive region comprises a plurality of transmissive regions and the plurality of transmissive regions are arranged in spaced relation, the at least one laser comprises a laser, the light source assembly further comprising:

The turning mirror group is positioned between the light combining component and the laser and is configured to divide the laser beam emitted by the laser into a plurality of laser beams, and the plurality of laser beams correspond to the plurality of transmission areas.
A laser projection device as claimed in claim 3, wherein,

The plurality of transmissive regions includes:

a first transmissive region located at a side of the reflective region near the laser; and

A second transmissive region located on a side of the reflective region remote from the laser, the reflective region being located between the first transmissive region and the second transmissive region;

The turning mirror group comprises:

A first mirror group configured to reflect a part of a laser beam emitted from the laser to the first transmission region; and

And a second mirror group configured to reflect another part of the laser beam emitted from the laser to the second transmission region.
The laser projection device of claim 1, wherein the at least one transmissive region comprises a plurality of transmissive regions, and the at least one laser comprises a plurality of lasers corresponding to the plurality of transmissive regions.
The laser projection device of claim 5, wherein,

The plurality of lasers includes:

A first laser configured to emit a first laser beam; and

A second laser configured to emit a second laser beam;

The plurality of transmissive regions includes:

A first transmission region located at a side of the reflection region near the plurality of lasers, the first transmission region configured to transmit the first laser beam; and

And a second transmission region located at a side of the reflection region remote from the plurality of lasers, the second transmission region configured to transmit the second laser beam, the reflection region being located between the first transmission region and the second transmission region.
The laser projection device according to any one of claims 1 to 6, wherein the light combining means includes:

a reflection part located at the reflection area, the reflection part configured to reflect the laser beam reflected by the fluorescent wheel and the fluorescent light emitted by the fluorescent wheel; and

At least one transmissive portion located in the at least one transmissive region, the at least one transmissive portion configured to transmit the laser beam emitted by the at least one laser and reflect the laser beam reflected by the fluorescent wheel and the fluorescent light emitted by the fluorescent wheel.
The laser projection device of claim 7, wherein the reflecting portion comprises:

the reflecting surface is a surface of the reflecting part opposite to the fluorescent wheel, the reflecting surface is a curved surface, and the reflecting surface is configured to collect fluorescence and laser beams from the fluorescent wheel and reflect the fluorescence and the laser beams to the light outlet of the light source assembly.
The laser projection device of any of claims 1 to 6, wherein the light combining means satisfies one of:

the light combining member includes:

A first substrate;

A reflective film disposed on the first substrate and located in the reflective region; and

A dichroic film disposed on the first substrate and located in the at least one transmissive region; or alternatively

The light combining member includes:

A first substrate;

A reflective film disposed on the first substrate and located in the reflective region; and

And the through hole is arranged on the first substrate and is positioned in the at least one transmission area.
The laser projection device of any of claims 1 to 9, wherein the light source assembly comprises:

A fly-eye lens disposed on the light combining member and located in the at least one transmission region, the fly-eye lens configured to homogenize and shape a spot of an incident laser beam, the fly-eye lens comprising:

A substrate; and

And a plurality of microlenses disposed on the substrate and arranged in an array, the plurality of microlenses configured to homogenize and shape a spot of an incident laser beam.
The laser projection device of any of claims 1 to 10, wherein the light source assembly further comprises:

A first lens group located between the light combining member and the at least one laser, the first lens group configured to reduce a spot of a laser beam emitted from the at least one laser;

a second lens group between the light combining member and the fluorescent wheel, the second lens group configured to converge the laser beam transmitted by the at least one transmission region to the fluorescent wheel; and

And a third lens group located at a light-emitting side of the light-combining member, the third lens group configured to condense laser light beams and fluorescence reflected by the light-combining member.
The laser projection device of any of claims 1 to 11, wherein the phosphor wheel comprises:

A second substrate;

a fluorescent material layer arranged on the second substrate and located in the second region;

a first reflective layer disposed on the second substrate and located in the first region; and

And a second reflective layer disposed between the second substrate and the fluorescent material layer and located in the second region.
A laser projection device, comprising:

A light source assembly configured to emit an illumination beam;

An optical machine configured to modulate an illumination beam emitted by the light source assembly to obtain a projection beam; and

A lens configured to image the projection beam;

The light source assembly includes:

A plurality of lasers configured to emit laser beams;

A plurality of first lens groups corresponding to the plurality of lasers, the plurality of first lens groups configured to converge laser beams emitted by the plurality of lasers;

The light combining component is positioned at the light emitting side of the lasers and is obliquely arranged relative to the light emitting directions of the lasers, and the light combining component comprises:

a reflection region configured to reflect an incident laser beam; and

A plurality of transmission regions arranged in correspondence with the plurality of first lens groups with a space therebetween, the plurality of transmission regions configured to transmit the laser beams condensed by the plurality of first lens groups;

A second lens group located at a side of the light combining member away from the plurality of lasers, the second lens group configured to condense laser beams transmitted by the plurality of transmission regions, positions of the laser beams transmitted by the plurality of transmission regions irradiated on the second lens group being symmetrical with respect to an optical axis of the second lens group; and

The fluorescent wheel is located the second lens group keep away from the one side of light combining part, the fluorescent wheel includes:

A first region configured to reflect the laser beam condensed by the second lens group to the second lens group; and

A second region configured to be excited to generate fluorescence under irradiation of a laser beam condensed by the second lens group;

Along with the rotation of the fluorescent wheel, the laser beams converged by the second lens group respectively irradiate the first area and the second area, the laser beams reflected by the first area and the fluorescence emitted by the second area respectively enter the light combining component through the second lens group, and are reflected to the light outlet of the light source component through the light combining component, and the laser beams and the fluorescence emitted from the light outlet of the light source component form the illumination beams.
The laser projection device of claim 13, wherein,

The plurality of lasers includes:

A first laser configured to emit a first laser beam; and

A second laser configured to emit a second laser beam;

the plurality of first lens groups includes:

A first sub-lens group located on the light-emitting side of the first laser, the first sub-lens group configured to converge the first laser beam; and

A second sub-lens group located on the light-emitting side of the second laser, the second sub-lens group configured to converge the second laser beam;

The plurality of transmissive regions includes:

A first transmission region corresponding to the first sub-lens group, the first transmission region configured to transmit a first laser beam condensed through the first sub-lens group; and

A second transmission region corresponding to the second sub-lens group, the second transmission region configured to transmit a second laser beam condensed through the second sub-lens group; wherein the method comprises the steps of

The positions of the laser beams transmitted by the first transmission region and the second transmission region irradiated on the second lens group are symmetrical with respect to the optical axis of the second lens group.
The laser projection device of claim 13 or 14, wherein the plurality of transmissive regions are located at the focal points of the plurality of first lens groups, respectively.
The laser projection device of any of claims 13 to 15, wherein at least one of the pitches of the plurality of first lens groups and the second lens group is not equal to a focal length of the second lens group in a direction parallel to an optical axis of the second lens group, the fluorescent wheel being located at a focal plane of the second lens group.
The laser projection device of any of claims 13 to 16, wherein focal lengths of the plurality of first lens groups are equal.
The laser projection device of any of claims 13 to 17, wherein the light source assembly further comprises a light diffusing structure disposed at a surface of the light combining member proximate to the plurality of lasers, and the light diffusing structure is configured to homogenize a laser beam incident to the light combining member.
The laser projection device of any of claims 13 to 18, wherein the light source assembly further comprises a third lens group located on a light exit side of the light combining member, and the third lens group is configured to condense a laser beam and fluorescence reflected by the light combining member.
The laser projection device of any of claims 13 to 19, wherein the phosphor wheel comprises:

A second substrate;

a fluorescent material layer arranged on the second substrate and located in the second region;

a first reflective layer disposed on the second substrate and located in the first region; and

And a second reflective layer disposed between the second substrate and the fluorescent material layer and located in the second region.