Light-emitting apparatus and projection device

Abstract

Provided are a light-emitting apparatus and a projection device The light-emitting apparatus comprises a plurality of light-emitting chips and a collimation lens, wherein the collimation lens comprises a first collimation portion and a second collimation portion, the first collimation portion is configured to: reduce a diffusion angle of a laser emitted from the first collimation portion in a first direction to 0°, and reduce a diffusion angle of the laser emitted from the first collimation portion in a second direction, the diffusion angle of the laser emitted from the first collimation portion in the second direction being greater than 0°, and the second collimation portion is configured to: reduce a diffusion angle of a laser emitted from the second collimation portion in the second direction to 0°.

Description

Light-emitting devices and projection equipment

[0001] This application claims priority to Chinese patent application No. 202311732688.8 filed on December 15, 2023; and priority to Chinese patent application No. 202311575066.9 filed on November 23, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present disclosure relates to the field of laser projection technology, and in particular to a light-emitting device and a projection equipment. Background Art

[0003] With the promotion and application of projection equipment, consumers' demand for miniaturized projection equipment is gradually increasing. In order to achieve the miniaturization of projection equipment, the design of light source products must not only achieve basic lighting functions, but also take into account multiple aspects such as size, cost, and optical efficiency.

[0004] Summary of the Invention

[0005] On the one hand, a light-emitting device is provided. The light-emitting device includes a plurality of light-emitting chips and a collimating lens. The plurality of light-emitting chips are configured to emit laser light. The collimating lens is located on the light-emitting side of the plurality of light-emitting chips. The collimating lens is configured to receive laser light from the plurality of light-emitting chips and collimate the incident laser light. The collimating lens includes a first collimating portion and a second collimating portion. The first collimating portion is a surface of the collimating lens facing the plurality of light-emitting chips. The first collimating portion is configured to: collimate the incident laser light in a first direction, and reduce the diffusion angle of the incident laser light in a second direction, so that the diffusion angle of the laser light emitted from the first collimating portion in the first direction is reduced to 0°, the diffusion angle of the laser light emitted from the first collimating portion in the second direction is reduced, and the diffusion angle of the laser light emitted from the first collimating portion in the second direction is greater than 0°. The divergence angle of the laser light incident on the first collimating section in the first direction is greater than the divergence angle in the second direction. The first direction is parallel to the fast axis direction of the laser light incident on the first collimating section, and the second direction is parallel to the slow axis direction of the laser light incident on the first collimating section. The first direction is perpendicular to the second direction. The second collimating section is a surface of the collimating lens that is distal from the plurality of light-emitting chips and is spaced apart from the first collimating section. The second collimating section is configured to collimate the incident laser light in the second direction, maintain the divergence angle of the laser light emitted through the second collimating section in the first direction, and reduce the divergence angle of the laser light emitted through the second collimating section in the second direction to 0°. The change in the divergence angle of the laser light emitted from the second collimating section in the second direction is greater than the change in the divergence angle of the laser light emitted from the first collimating section in the second direction.

[0006] In another aspect, a projection device is provided. The projection device includes a light source, an optical modulation component, and a lens. The light source is configured to emit an illumination beam. The light source includes the light-emitting device. The optical modulation component is configured to modulate the illumination beam emitted by the light source to obtain a projection beam. The lens is configured to image the projection beam.

[0007] On the other hand, a light-emitting device is provided. The light-emitting device includes a plurality of light-emitting chips and a collimating lens. The plurality of light-emitting chips are configured to emit laser light. The collimating lens is located on the light-emitting side of the plurality of light-emitting chips, and is configured to receive laser light from the plurality of light-emitting chips and collimate the incident laser light. The collimating lens includes a first area, a second area, and an optical path adjustment component. The first area is configured to collimate the laser light incident on the first area. The second area is located on at least one side of the first area along the width direction of the collimating lens. The optical path adjustment component is provided in the second area, and the optical path adjustment component is configured to adjust the optical path of the laser light incident on the second area so that the adjusted laser light is incident on the first area.

[0008] In some embodiments, the collimating lens includes a groove, and at least a portion of the collimating lens is recessed toward a side away from the plurality of light-emitting chips to form the groove. The groove includes a bottom surface and sidewalls. The bottom surface is the light incident surface of the collimating lens and is located in the first zone. The sidewalls are first sub-adjustment components. The first sub-adjustment component is located in the second zone and is configured to adjust the optical path of the laser light incident on the second zone so that the laser light incident on the second zone is incident on the first zone. The optical path adjustment component includes the first sub-adjustment component.

[0009] In some embodiments, the first sub-adjustment component satisfies at least one of the following conditions: a first angle between the first sub-adjustment component and the light incident surface is greater than or equal to 110° and less than or equal to 40°; or, along the thickness direction of the collimating lens, a height of the collimating portion is greater than or equal to 0.5 mm and less than or equal to 7 mm.

[0010] In some embodiments, the collimating lens includes a target curved surface, the target curved surface being located on the side of the collimating lens away from the light incident surface and being located in the first region, the target curved surface being convex toward the side away from the light incident surface. The thickness of the target curved surface is greater than or equal to 0.8 mm and less than or equal to 1.1 mm. Along the thickness direction of the collimating lens, the minimum distance between the target curved surface and the light incident surface is greater than or equal to 0.8 mm and less than or equal to 1.5 mm.

[0011] In some embodiments, the optical path adjustment component includes a second sub-adjustment component. The second sub-adjustment component is formed on two side walls of the collimating lens in the first direction. The second sub-adjustment component is configured to adjust the optical path of the laser light incident on the second region so that the laser light incident on the second region is incident on the first region. The collimating lens further includes a light incident surface, which is the side of the collimating lens facing the plurality of light-emitting chips and is located between the first region and the second region.

[0012] In some embodiments, a second included angle β between the second sub-adjustment component and the light incident surface is greater than or equal to 40° and less than or equal to 50°.

[0013] In some embodiments, the collimating lens includes a target curved surface. The target curved surface is located on the side of the collimating lens away from the light incident surface and is located in the first region. The target curved surface is convex toward the side away from the light incident surface. The thickness of the target curved surface is greater than or equal to 0.8 mm and less than or equal to 1.1 mm. Along the thickness direction of the collimating lens, the minimum distance between the target curved surface and the light incident surface is greater than or equal to 0.7 mm and less than or equal to 0.9 mm.

[0014] In some embodiments, the thickness of the collimating lens is greater than or equal to 1.5 mm and less than or equal to 2.0 mm. The optical path between the plurality of light-emitting chips and the light incident surface of the collimating lens is greater than or equal to 1.9 mm and less than or equal to 2.2 mm. In the first direction, the width of the first region is greater than or equal to 3.0 mm and less than or equal to 3.4 mm.

[0015] In some embodiments, the collimating lens further comprises a microstructured surface. The microstructure is located on a side of the collimating lens away from the plurality of light-emitting chips and is located in the second region. The microstructure is configured to collimate laser light incident on the microstructured surface. The microstructured surface comprises at least one of a Fresnel structured surface or a diffractive optical element. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a structural diagram of a light emitting device of related art;

[0017] FIG2 is another structural diagram of a light emitting device in related art;

[0018] FIG3 is a structural diagram of a light-emitting chip of related art;

[0019] FIG4A is a block diagram of a laser projection device according to some embodiments;

[0020] FIG4B is another structural diagram of a laser projection device according to some embodiments;

[0021] FIG4C is another structural diagram of a laser projection device according to some embodiments;

[0022] FIG4D is a light path diagram of a light source, an optical modulation component, and a lens in a laser projection device according to some embodiments;

[0023] FIG4E is a diagram illustrating an arrangement of tiny reflective mirrors in a digital micromirror device according to some embodiments;

[0024] FIG4F is a diagram showing the position of a tiny reflective mirror in the digital micromirror device of FIG4E;

[0025] FIG4G is a schematic diagram illustrating the operation of a micro reflective mirror according to some embodiments;

[0026] FIG4H is another structural diagram of a laser projection device according to some embodiments;

[0027] FIG4I is another structural diagram of a laser projection device according to some embodiments;

[0028] FIG5A is a structural diagram of a light emitting device according to some embodiments;

[0029] FIG5B is an exploded view of a light emitting device according to some embodiments;

[0030] FIG5C is another structural diagram of a light emitting device according to some embodiments;

[0031] FIG5D is another structural diagram of a light emitting device according to some embodiments;

[0032] FIG5E is another structural diagram of a light emitting device according to some embodiments;

[0033] FIG6 is a cross-sectional view of the light emitting device along line AA′ in FIG5E ;

[0034] FIG7 is another structural diagram of a light emitting device according to some embodiments;

[0035] FIG8A is a top view of the light emitting device in FIG7 ;

[0036] FIG8B is a structural diagram of a light-emitting chip according to some embodiments;

[0037] FIG9 is a perspective view of a collimating lens according to some embodiments;

[0038] FIG10 is another perspective view of a collimating lens according to some embodiments;

[0039] FIG11 is a structural diagram of a collimating lens according to some embodiments;

[0040] FIG12 is another structural diagram of a collimating lens according to some embodiments;

[0041] FIG13 is another structural diagram of a light emitting device according to some embodiments;

[0042] FIG14 is a schematic diagram of laser light passing through a collimating lens according to some embodiments;

[0043] FIG15 is another schematic diagram of laser light passing through a collimating lens according to some embodiments;

[0044] FIG16 is another structural diagram of a light emitting device according to some embodiments;

[0045] FIG17 is another structural diagram of a light emitting device according to some embodiments;

[0046] FIG18 is another structural diagram of a light emitting device according to some embodiments;

[0047] FIG19 is another structural diagram of a light emitting device according to some embodiments;

[0048] FIG20 is another structural diagram of a light emitting device according to some embodiments;

[0049] FIG21 is another structural diagram of a collimating lens according to some embodiments;

[0050] FIG22 is a cross-sectional view of a collimating lens according to some embodiments;

[0051] FIG23 is another structural diagram of a light emitting device according to some embodiments;

[0052] FIG24 is another cross-sectional view of a collimating lens according to some embodiments;

[0053] FIG25 is another cross-sectional view of a collimating lens according to some embodiments;

[0054] FIG26 is another structural diagram of a light emitting device according to some embodiments;

[0055] FIG27 is another cross-sectional view of a collimating lens according to some embodiments;

[0056] FIG28 is another cross-sectional view of a collimating lens according to some embodiments;

[0057] FIG29 is another cross-sectional view of a collimating lens according to some embodiments;

[0058] FIG30 is a structural diagram of a diffractive optical element according to some embodiments;

[0059] FIG31 is another structural diagram of a diffractive optical element according to some embodiments;

[0060] FIG32 is another structural diagram of a diffractive optical element according to some embodiments;

[0061] FIG33 is a structural diagram of a Fresnel structure surface according to some embodiments;

[0062] FIG34 is another structural diagram of a collimating lens according to some embodiments;

[0063] FIG35 is another cross-sectional view of a collimating lens according to some embodiments;

[0064] FIG36 is another structural diagram of a light emitting device according to some embodiments;

[0065] FIG37 is another structural diagram of a collimating lens according to some embodiments;

[0066] FIG38 is another structural diagram of a light emitting device according to some embodiments. DETAILED DESCRIPTION

[0067] The following will clearly and completely describe some embodiments of the present disclosure in conjunction with the accompanying drawings. However, the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0068] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "compritang", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0069] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0070] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. The term "connected" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. The term "coupled" indicates that two or more components are in direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0071] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0072] The use of "adapted to" or "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0073] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0074] Typically, as shown in Figures 1 and 2, a light-emitting device 1000 includes multiple light-emitting components 1001. The multiple light-emitting components 1001 are arranged in an array and can be packaged on a substrate. The number of light-emitting components 1001 is positively correlated with the luminous flux ultimately output by the light-emitting device 1000.

[0075] As shown in FIG2 , the light emitting component 1001 includes a light emitting chip 1011 . The light emitting chip 1011 is configured to emit laser light. The light emitting components 1001 include a plurality of light emitting chips 1011 , and the plurality of light emitting chips 1011 include a red light emitting chip 10111 , a blue light emitting chip 10112 , and a green light emitting chip 10113 .

[0076] It should be noted that the red light-emitting chip 10111 may refer to a light-emitting chip 1011 that emits red laser light; the blue light-emitting chip 10112 may refer to a light-emitting chip 1011 that emits blue laser light; and the green light-emitting chip 10113 may refer to a light-emitting chip 1011 that emits green laser light.

[0077] As shown in FIG2 , the light emitting assembly 1001 further includes a plurality of heat sinks 1010 (heat sink substrates). The light emitting chips 1011 are disposed on the heat sinks 1010 . The heat sinks 1010 are configured to dissipate heat from the light emitting chips 1011 .

[0078] As shown in Figure 2, the light emitting device 1000 further includes a plurality of reflective lenses 1002. The reflective lenses 1002 are configured to reflect the laser light emitted by the light emitting chip 1011. For example, the laser light emitted by the light emitting chip 1011 is deflected by 90 degrees after passing through the reflective lenses 1002.

[0079] As shown in FIG2 , the light emitting device 1000 further includes a collimating lens 1003 . The collimating lens 1003 is configured to collimate the laser light reflected by the reflecting lens 1002 .

[0080] Because the laser's diffusion angle in the fast axis direction is greater than its diffusion angle in the slow axis direction, as shown in Figure 3, after the laser is collimated by collimating lens 1003, the laser spot 1020 formed at collimating lens 1003 is elliptical. The major axis of spot 1020 is parallel to the fast axis, and the minor axis of spot 1020 is parallel to the slow axis. Because the size of spot 1020 in the fast axis direction is significantly greater than that in the slow axis direction, the homogenization effect of spot 1020 in the fast and slow axis directions differs, affecting the homogenization and despeckle effect of spot 1020.

[0081] In order to solve the above problems, some embodiments of the present disclosure provide a projection device 1. The projection device 1 includes a light-emitting device 100. The light-emitting device 100 includes a first collimating portion 31 and a second collimating portion 32. The first collimating portion 31 collimates the incident laser in the fast axis direction and reduces the diffusion angle of the incident laser in the slow axis direction, and the diffusion angle is greater than 0°. The second collimating portion 32 collimates the incident laser in the slow axis direction. In this way, the short-axis width of the light spot formed by the laser in the second collimating portion 32 is greater than the short-axis length of the light spot formed by the laser in the first collimating portion 31, which reduces the difference between the long-axis length and the short-axis length of the light spot, which is beneficial to improving the homogenization and dissipation effect of the light spot.

[0082] As shown in FIG4A , the projection device 1 includes a light source 1030. The light source 1030 is configured to provide an illumination beam (laser beam). The projection device 1 also includes an optical modulation component 1040. The optical modulation component 1040 is configured to modulate the illumination beam provided by the light source 1030 using an image signal to obtain a projection beam. The projection device 1 also includes a lens 1050. The lens 1050 is configured to project the projection beam onto a screen or wall to form an image. The projection device 1 also includes an entire housing 40 (only a portion of the entire housing 40 is shown in FIG4B ), in which the light source 1030, the optical modulation component 1040, and the lens 1050 are respectively assembled.

[0083] Light source 1030, optical modulation assembly 1040, and lens 1050 are sequentially connected along the beam propagation direction and each enclosed by a corresponding housing. The housings of light source 1030, optical modulation assembly 1040, and lens 1050 support the corresponding optical components and ensure that each optical component meets certain sealing or airtight requirements.

[0084] The first end of the optical modulation assembly 1040 is connected to the light source 1030, and the light source 1030 and the optical modulation assembly 1040 are arranged along the direction of emission of the illumination beam from the projection device 1 (refer to the M direction in FIG. 4A ). The second end of the optical modulation assembly 1040 is connected to the lens 1050, and the optical modulation assembly 1040 and the lens 1050 are arranged along the direction of emission of the projection beam from the projection device 1 (refer to the N direction in FIG. 4A ). The emission direction M of the illumination beam is substantially perpendicular to the emission direction N of the projection beam. This connection structure not only adapts to the optical path characteristics of the reflective light valve in the optical modulation assembly 1040, but also helps shorten the optical path length in one dimension, facilitating the overall device layout. For example, if the light source 1030, the optical modulation assembly 1040, and the lens 1050 are arranged in one dimension (e.g., the M direction), the optical path length in that dimension will be very long, which is not conducive to the overall device layout. The reflective light valve will be described later.

[0085] In some embodiments, light source 1030 can sequentially provide three primary colors of light (or additional colors of light in addition to the three primary colors). Due to the persistence of vision of the human eye, the human eye perceives white light as a mixture of the three primary colors. Alternatively, light source 1030 can simultaneously output the three primary colors of light, continuously emitting white light. As shown in FIG4B , light source 1030 includes a light-emitting device 100 that can emit at least one color of laser beam, such as a red laser beam, a blue laser beam, or a green laser beam.

[0086] The illumination beam emitted by the light source 1030 enters the optical modulation assembly 1040. As shown in Figures 4C and 4D, the optical modulation assembly 1040 includes an illumination lens assembly 201 and a light modulation device (or light valve) 202. The illumination lens assembly 201 is configured to receive the illumination beam provided by the light source 1030 and transmit the illumination beam to the light modulation device 202 at a set angle and direction. The light modulation device 202 is configured to modulate the illumination beam to obtain a projection beam and reflect the projection beam into the lens 300.

[0087] In some embodiments, as shown in Figures 4C and 4D, the illumination lens assembly 201 includes a light homogenizing component 210, a lens assembly 220, and a prism assembly 250. The light homogenizing component 210 is configured to receive an illumination beam provided by the light source 1030 and homogenize the illumination beam. The lens assembly 220 is configured to converge the illumination beam emitted from the light homogenizing component 210 to the prism assembly 250. The prism assembly 250 is configured to reflect the illumination beam to the light modulation device 202.

[0088] In some embodiments, as shown in Figures 4C and 4D , the light homogenizing component 210 includes a light pipe 2101. The light outlet of the light pipe 2101 can be rectangular, thereby shaping the light spot. This allows the light spot shape of the illumination beam emitted from the light pipe 2101 to match the rectangular light-receiving surface of the optical modulator 202. Alternatively, the light homogenizing component 210 can include a fly-eye lens. This fly-eye lens can homogenize the incident illumination beam and shape it to output a rectangular light spot.

[0089] 4C and 4D , the illumination lens assembly 201 further includes a reflector 230 . The reflector 230 is located on the light-emitting side of the lens assembly 220 and is configured to reflect the illumination light beam emitted from the lens assembly 220 to the prism assembly 250 .

[0090] In some embodiments, as shown in FIG. 4D , the light modulation device 202 includes a digital micromirror device (DMD) 240 .

[0091] In the optical modulation assembly 1040, the DMD 240 is a core component configured to modulate the illumination beam provided by the light source 1030 using the image signal. In other words, the DMD 240 controls the illumination beam to display different brightness and grayscale for different pixels of the image to be projected, thereby ultimately forming an optical image.

[0092] The DMD 240 is used in a digital light processing (DLP) projection architecture. As shown in Figures 2 and 4D, the optical modulation component 1040 uses the DLP projection architecture. As shown in Figure 4E, the DMD 240 includes thousands of tiny reflective mirrors 2401 that can be individually driven to rotate. These tiny reflective mirrors 2401 are arranged in an array, and each tiny reflective mirror 2401 (for example, each tiny reflective mirror 2401) corresponds to a pixel in the image to be projected. In the DLP projection architecture, each tiny reflective mirror 2401 is equivalent to a digital switch. Under the action of an external electric field, it can swing within a range of ±12° or ±17°, so that the reflected light can pass through the lens 300 along the optical axis and form an image on the screen, forming a bright pixel.

[0093] For example, as shown in FIG4F , for a micro-reflector 2401 with a deflection angle of ±12°, the state at +12° is the on state, and the state at -12° is the off state. For deflection angles between -12° and +12°, the actual operating states of the micro-reflector 2401 are only the on state and the off state. As shown in FIG4G , the light reflected by the micro-reflector 2401 at a negative deflection angle is called OFF light, which is invalid light. Invalid light is generally hit by the housing or light absorption portion of the optical modulation component 1040 and absorbed. The light reflected by the micro-reflector 2401 at a positive deflection angle is called ON light. ON light is the effective light beam that is received by the micro-reflector 2401 on the surface of the DMD 240 and enters the lens 300 through the positive deflection angle for projection imaging. During the display period of a frame of image, some or all of the tiny reflective mirrors 2401 will switch between the on state and the off state once, thereby realizing the grayscale of each pixel in a frame of image according to the time that the tiny reflective mirrors 2401 remain in the on state and the off state respectively.

[0094] The light homogenizing component 210 , the lens group 220 and the reflector 230 at the front end of the DMD 240 form an illumination light path. The illumination light beam emitted by the light source 1030 passes through the illumination light path to form a beam size and incident angle that meet the requirements of the DMD 240 .

[0095] In some embodiments, as shown in FIG4H , lens 1050 comprises a plurality of lens elements, typically divided into three groups: a front group, a middle group, and a rear group, or a front and rear group. The front group is the lens group located near the light-emitting side of projection device 1 (i.e., the side of lens 1050 facing away from optical modulation assembly 1040 along the N direction in FIG4H ). The rear group is the lens group located near the light-emitting side of optical modulation assembly 1040 (i.e., the side of lens 1050 facing away from optical modulation assembly 1040 along the opposite direction of the N direction in FIG4H ). Lens 1050 can be a zoom lens, a fixed-focus adjustable lens, or a fixed-focus lens.

[0096] In some embodiments, projection device 1 is an ultra-short-throw projection device, and lens 1050 is an ultra-short-throw projection lens. The throw ratio of lens 1050 is typically less than 0.3, such as 0.24. A smaller throw ratio indicates a larger projection image from projection device 1 at the same projection distance. Ultra-short-throw lenses with low throw ratios can accommodate narrow spaces while maintaining high projection quality. Thus, projection device 1 can achieve large-scale projection displays with a smaller throw ratio.

[0097] In some embodiments, as shown in Figure 4I, the projection device 1 further includes a projection screen 60. The projection screen 60 is disposed on the light exit path of the lens 1050 and can reflect the projection light beam emitted by the lens 1050 to display a projection image.

[0098] The light emitting device 100 of the light source 1030 of the present disclosure is described in detail below.

[0099] In some embodiments, as shown in Figures 5A to 5C , a light-emitting device 100 includes a base plate 5 and at least one housing 4. Housing 4 is mounted on base plate 5. For example, housing 4 and base plate 5 are secured together using a tin-silver-copper alloy by reflow soldering. In another example, housing 4 and base plate 5 are secured together by high-temperature, pressure-sintering silver paste (or copper paste).

[0100] In some embodiments, the base plate 5 includes a printed circuit board (PCB) to achieve circuit interconnection between the base plate 5 and the housing 4. The base plate 5 can be made of metal materials such as oxygen-free copper and red copper.

[0101] In some embodiments, as shown in FIG5A to FIG5C , the at least one tube shell 4 includes a plurality of tube shells 4 . The plurality of tube shells 4 are respectively disposed on the bottom plate 5 .

[0102] 5C to 5E , the tube shell 4 includes a side wall (tube shell side wall) 41. The side wall 41 can be made of ceramic material or metal alloy material.

[0103] In some embodiments, as shown in Figures 5E and 6 , housing 4 further includes a substrate 42. Substrate 42 has a high degree of flatness, which increases the precision of component assembly on substrate 42. Substrate 42 can be made of materials with good heat dissipation, such as oxygen-free copper and diamond. The central rectangular portion of substrate 42 serves as a circuit isolation area. Substrate 42 and sidewall 41 can be formed into a single piece through a sintering process.

[0104] It should be noted that an identification area may be provided on one side of the side wall 41 so as to identify the orientation or direction of the side wall 41 when the base plate 42 serves as a part of the bottom plate 5 .

[0105] In some embodiments, as shown in Figures 5C and 5D , housing 4 further includes a step 44. Along the length of housing 4, steps 44 are located on both sides of sidewall 41. Steps 44 are coated with a metal film and are connected to substrate 42 to interconnect with bottom plate 5. A circular hole in the middle of step 44 serves as an identification area to mark or identify the location of housing 4 or other information.

[0106] In some embodiments, as shown in Figures 5E and 7, the light-emitting device 100 further includes a cover plate 43. Cover plate 43 is located on the side of sidewall 41 away from substrate 42 and is configured to enhance the airtightness of package 4. Cover plate 43 can be made of high-strength sapphire or glass. Cover plate 43 includes a first region and a second region. The second region is a light-transmitting area. The first region is located around the second region and is provided with a metal layer and alloy solder to facilitate welding of cover plate 43 to sidewall 41, thereby achieving airtightness of package 4.

[0107] It should be noted that the higher the processing flatness of the first region, the thinner the solder layer can be. The first region includes the welding area. After the alloy solder melts at a temperature above its melting point, the solder can fill the welding area. If the thickness of the alloy solder is thinner than the thickness of the welding area of ​​the tube shell 4, the solder cannot completely fill the welding area, resulting in poor airtightness.

[0108] In some embodiments, as shown in FIG. 5A and FIG. 5B , the bottom plate 5 , the tube shell 4 , and the cover plate 43 form a receiving cavity.

[0109] In some embodiments, as shown in FIG5E and FIG7 , the light-emitting device 100 further includes at least one light-emitting component 10. The light-emitting components 10 are arranged in a line within the receiving cavity. The light-emitting components 10 are configured to emit laser light. The light-emitting components 10 are secured to the substrate 42. For example, the light-emitting components 10 are secured to the substrate 42 using a nano-metal slurry through a low-temperature sintering process. This improves the thermal conductivity and mechanical reliability of the light-emitting components 10 at high temperatures after sintering.

[0110] In some embodiments, as shown in FIG7 and FIG8A , a light-emitting assembly 10 includes a light-emitting chip 11. The light-emitting assembly 10 also includes a heat sink 12. The light-emitting chip 11 is disposed on the heat sink 12. For example, the light-emitting chip 11 is soldered to the heat sink 12 using a eutectic process. The heat sink 12 can be made of a material with a high thermal conductivity, such as aluminum nitride (AlN) and silicon carbide (SiC).

[0111] In some embodiments, as shown in FIG8B , the light-emitting chip 11 includes an active layer 1016. The active layer 1016 is a core component of the light-emitting chip 11 and is configured to convert electrical energy into light energy and generate laser light. The width of the active layer 1016 is typically between 100 μm and 500 μm.

[0112] As shown in FIG8B , the light-emitting chip 11 further includes a first confinement layer 1015 and a second confinement layer 1014. The first confinement layer 1015 is disposed on one side of the active layer 1016, while the second confinement layer 1014 is disposed on the other side of the active layer 1016, facing the first confinement layer 1015. The first confinement layer 1015 and the second confinement layer 1014 can confine the propagation of laser light within the active layer 1016, thereby improving beam quality and reducing light leakage. The first confinement layer 1015 and the second confinement layer 1014 can also protect the active layer 1016 from external influences.

[0113] As shown in FIG8B , the light-emitting chip 11 further includes a first waveguide layer 1013 and a second waveguide layer 1012. The first waveguide layer 1013 is located on the side of the first confinement layer 1015 away from the active layer 1016. The second waveguide layer 1012 is located on the side of the second confinement layer 1014 away from the active layer 1016. The first waveguide layer 1013 and the second waveguide layer 1012 are each made of a material with a high refractive index, such as indium phosphide (InP) or gallium arsenide phosphide (GaAsP). The first waveguide layer 1013 and the second waveguide layer 1012 guide light waves propagating within the chip, concentrating the light within the active layer 1016.

[0114] As shown in Figure 8B, the light emitting chip 11 further includes a first electrode 1019 and a second electrode 1018. By providing the first electrode 1019 and the second electrode 1018, an electric field can be formed to provide current to the active layer and stimulate laser emission.

[0115] 8B , the light emitting chip 11 further includes a substrate 1017 . The substrate 1017 is made of silicon or other semiconductor materials and serves as a base of the light emitting chip 11 .

[0116] It should be noted that, since the first waveguide 1013 and the second waveguide 1012 are small in the height direction of the light emitting chip 1011, when the laser is emitted in the height direction of the light emitting chip 1011, the laser quality is close to the diffraction limit and the laser has a large diffusion angle.

[0117] In some embodiments, the at least one light emitting component 10 includes a plurality of light emitting components 10. The plurality of light emitting components 10 are arranged in an array, and are arranged in rows and columns along the first direction X and the second direction Y, respectively.

[0118] 5E , the plurality of light emitting components 10 include a first light emitting component 101, a second light emitting component 102, and a third light emitting component 103. The number of first light emitting components 101 is greater than the number of second light emitting components 102, and the number of first light emitting components 101 is greater than the number of third light emitting components 103.

[0119] As shown in FIG. 5E , the first light-emitting assembly 101 includes a red light-emitting chip 1110 and a heat sink 12 , the second light-emitting assembly 102 includes a green light-emitting chip 112 and a heat sink 12 , and the third light-emitting assembly 103 includes a blue light-emitting chip 113 and a heat sink 12 .

[0120] In some embodiments, as shown in Figures 5E and 6, the light-emitting device 100 further includes a reflective lens 20. The reflective lens 20 is disposed in the accommodating cavity and on the light-emitting side of the light-emitting component 10. The reflective lens 20 is configured to reflect the laser light emitted by the light-emitting chip 10. For example, the reflective lens 20 reflects the laser light emitted by the light-emitting component 10 to the cover plate 43. The reflective lens 20 can be made of materials such as borosilicate glass, quartz, and silicon. The reflective surface of the reflective lens 20 is coated with an anti-reflection film to improve the reflectivity. The reflective lens 20 is fixed to the substrate 42. For example, the reflective lens 20 is fixed to the substrate 42 by a low-temperature sintering process using nano-metal slurry.

[0121] In some embodiments, as shown in Figures 5E and 6, the light-emitting device 100 further includes a collimating lens 30. The collimating lens 30 is located on the light-emitting side of the light-emitting chip 11. The collimating lens 30 is configured to collimate the laser light emitted from the light-emitting side before emitting the laser light. For example, the laser light passes through the cover plate 43 and is incident on the collimating lens 30, and is collimated by the collimating lens 30 before being emitted. It is understood that the collimating lens 30 being located on the light-emitting side of the light-emitting component 10 can mean that the collimating lens 30 is located on the light-emitting path of the light-emitting component 10.

[0122] 5A and 5B , the collimating lens 30 is directly mounted on the cover plate 43. For example, the collimating lens 30 is fixed by applying glue to the four corners of the collimating lens 30, and the glue application position needs to avoid the light-transmitting area.

[0123] It should be noted that, as shown in Figures 5E and 6 , the laser light can be emitted from the top surface of the light-emitting device 100. Alternatively, the laser light can be emitted from the side surface of the light-emitting device 100. In the case where the laser light is emitted from the side surface of the light-emitting device 100, the reflective lens 20 can be omitted. The top surface can refer to the surface where the cover plate 43 is located, and the side surface can refer to one of the two side surfaces along the width direction of the collimating lens where the side wall 41 is located.

[0124] The first direction X is defined as the fast axis direction of the laser incident on the collimating lens 30, and the second direction Y is defined as the slow axis direction of the laser incident on the collimating lens 30. The third direction Z is the fast axis direction of the laser emitted by the light-emitting component 10. Any two of the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. It should be noted that the diffusion angle of the light-emitting component 10 in the fast axis direction is greater than the diffusion angle in the slow axis direction. For example, the diffusion angle of the light-emitting component 10 in the fast axis direction is any value within the range of 40° to 60°, and the diffusion angle of the light-emitting component 10 in the slow axis direction is any value within the range of 6° to 15°.

[0125] When laser light is emitted from the top surface of the light-emitting device 100, as shown in Figures 5E and 7, the light-emitting component 10 emits laser light in a direction opposite to the first direction X. The laser light has a diffusion angle in the third direction Z and a diffusion angle in the second direction Y, and the seventh diffusion angle is greater than the eighth diffusion angle. At this time, the fast axis of the laser light is parallel to the third direction Z, and the slow axis is parallel to the second direction Y. The laser light is then deflected 90° by the reflective lens 20 and incident on the collimating lens 30. As the propagation direction of the laser light changes, the major axis of the light spot formed at the collimating lens 30 becomes parallel to the first direction X, and the minor axis of the light spot becomes parallel to the second direction Y.

[0126] When the laser light is emitted from the side of the light emitting device 100, the fast axis direction of the laser light is parallel to the third direction Z, and the slow axis direction is parallel to the second direction Y. The laser light emitted by the light emitting assembly 10 is directly incident on the collimating lens 30. The long axis direction of the light spot formed at the collimating lens 30 is parallel to the fast axis direction of the laser light, and the short axis direction of the light spot is parallel to the slow axis direction of the laser light.

[0127] The following description will be made by taking the laser being emitted from the top surface of the light emitting device 100 as an example.

[0128] 5E and 7 , the collimating lens 30 includes a first collimating portion 31. The first collimating portion 31 is a side surface of the collimating lens 30 facing the light emitting side of the light emitting assembly 10. The first collimating portion 31 is configured to collimate the laser light in a first direction X.

[0129] The collimating lens 30 further includes a second collimating portion 32. The second collimating portion 32 is disposed opposite the first collimating portion 31 and is a side surface of the collimating lens 30 away from the light emitting side of the light emitting assembly 10. The second collimating portion 32 is configured to collimate the laser light in the second direction Y.

[0130] It should be noted that collimating the laser in a certain direction can be understood as the laser's diffusion angle in that direction being 0°. For example, collimating the laser in a first direction X can be understood as the laser's diffusion angle in the first direction X being 0°; collimating the laser in a second direction Y can be understood as the laser's diffusion angle in the second direction Y being 0°.

[0131] For example, as shown in Figures 9 and 10, the collimating lens 30 is a double-sided collimating lens. The first collimating portion 31 is the side of the double-sided collimating lens facing the light-emitting side. The second collimating portion 32 is the side of the double-sided collimating lens facing away from the light-emitting side. It should be noted that the double-sided collimating lens can focus or diverge incident light from two directions. The double-sided collimating lens has two sides with different curvatures. For example, the first curved surface focuses light while the second curved surface diverges light.

[0132] Along the first direction X, the first collimating portion 31 is a curved surface, and the second collimating portion 32 is a flat surface; along the second direction Y, the first collimating portion 31 is a flat surface, and the second collimating portion 32 is a curved surface.

[0133] In some embodiments, the first collimating portion 31 and the second collimating portion 32 may be an integral part to facilitate processing and manufacturing of the collimating lens 30. Alternatively, the first collimating portion 31 and the second collimating portion 32 may be separate parts to facilitate assembly and disassembly of the collimating lens 30, for example,

[0134] The laser light emitted from the light-emitting device 100 passes through the first collimating portion 31 and the second collimating portion 32 in sequence. As shown in FIG5E , when the laser light enters the first collimating portion 31, the laser light has a first diffusion angle θ1 in the first direction X. The first collimating portion 31 reduces the diffusion angle of the laser light in the first direction X to 0°, thereby collimating the laser light in the first direction X. Because the curvature of the second collimating portion 32 in the first direction X is zero, the diffusion angle of the laser light in the first direction X remains unchanged when the laser light passes through the second collimating portion 32. Thus, in the first direction X, the length of the laser light spot formed by the second collimating portion 32 is equal to the length of the laser light spot formed by the first collimating portion 31.

[0135] As shown in FIG7 , when the laser beam is incident on the first collimating portion 31, the laser beam has a second diffusion angle θ2 in the second direction Y. The second diffusion angle θ2 is smaller than the first diffusion angle θ1. The incident angle θ7 of the laser beam on the first collimating portion 31 is equal to the second diffusion angle θ2 (i.e., θ7 = θ2). The laser beam is refracted after passing through the first collimating portion 31. The refraction angle θ8 of the laser beam after refraction is equal to the third diffusion angle θ3 of the laser beam in the second direction Y after passing through the first collimating portion 31 (i.e., θ8 = θ3).

[0136] Since the refractive index n1 of the collimating lens 30 is greater than the refractive index n2 of air, the refraction angle θ3 can be determined to be less than the incident angle θ7 (i.e., θ3 < θ7) according to the refraction equation n1×sinθ7=n2×sinθ8. Thus, after passing through the first collimating portion 31, the diffusion angle of the laser light in the second direction Y decreases from the second diffusion angle θ2 to the third diffusion angle θ3, but the third diffusion angle θ3 is greater than 0°.

[0137] The refracted laser light then enters the second collimating portion 32 along the thickness direction of the collimating lens 30 (e.g., the third direction Z). Since the refracted laser light still has a certain diffusion angle (i.e., the third diffusion angle θ3) in the second direction Y, the length of the light spot formed by the laser light at the second collimating portion 32 increases as the optical path length increases in the second direction Y, and becomes longer than the length of the light spot formed by the laser light at the first collimating portion 31. This increases the minor axis length of the light spot, thereby reducing the difference between the major and minor axis lengths of the light spot. This improves the homogenization of the light spot in both the major and minor axis directions, facilitating improved light spot homogenization and speckle reduction.

[0138] When the laser beam enters the second collimating portion 32 , the second collimating portion 32 reduces the diffusion angle of the laser beam in the second direction Y, so that the laser beam is collimated in the second direction Y.

[0139] In some embodiments, the degree of change in the second direction Y of the laser light before and after being emitted through the second collimating portion 32 is greater than the degree of change in the second direction Y of the laser light before and after being emitted through the first collimating portion 31. The degree of change in the second direction Y of the laser light can be represented by the difference in the angle of the laser light in the second direction Y before and after being emitted through the second collimating portion 32. For example, the difference between the third diffusion angle θ3 and 0° is greater than the difference between the second diffusion angle θ2 and the third diffusion angle θ3.

[0140] For example, after the laser light emitted from the light-emitting assembly 10 is reflected by the reflective lens 20, the diffusion angle of the reflected laser light in the slow axis direction is 10° (the second diffusion angle is 10°). After being refracted by the first collimating portion 31, the diffusion angle is reduced to 6° (the third diffusion angle θ3 is 6°). The degree of change in the second direction Y of the laser light before and after being emitted from the first collimating portion 31 is 4°. After the laser light passes through the second collimating portion 32, the diffusion angle is reduced to 0°. The degree of change in the second direction Y of the laser light before and after being emitted from the second collimating portion 32 is 6°.

[0141] In the case that the light emitting device 100 includes a plurality of light emitting components 10 arranged in an array, the first collimating portion 31 and the second collimating portion 32 are provided corresponding to the plurality of light emitting components 10 .

[0142] The following describes how the first collimating portion 31 and the second collimating portion 32 are arranged corresponding to the plurality of light emitting components 10 .

[0143] In some embodiments, as shown in Figures 5E and 6, the first collimating portion 31 includes multiple first sub-collimating portions 311. The multiple first sub-collimating portions 311 are arranged along the first direction X and extend along the second direction Y. The first sub-collimating portions 311 correspond to a row of light-emitting assemblies 10 arranged along the second direction Y. In this way, the diffusion angle of the laser light emitted by the row of light-emitting assemblies 10 arranged along the second direction Y in the first direction X can be adjusted by the same first sub-collimating portion 311. The first sub-collimating portion 311 can be a cylindrical lens.

[0144] In some embodiments, as shown in Figures 7 and 8A, the second collimating portion 32 includes multiple second sub-collimating portions 321. The multiple second sub-collimating portions 321 are arranged along the second direction Y and extend along the first direction X. The second sub-collimating portions 321 correspond to a row of light-emitting assemblies 10 arranged along the first direction X. In this way, the diffusion angle of the laser light emitted by the row of light-emitting assemblies 10 arranged along the first direction X in the second direction Y can be adjusted by the same second sub-collimating portion 321. The second sub-collimating portion 321 can be a cylindrical lens. The arrangement direction of the second sub-collimating portions 321 is perpendicular to that of the first sub-collimating portions 311.

[0145] It should be noted that the number of the first sub-collimating portions 311 and the second sub-collimating portions 321 is related to the arrangement and number of the light-emitting components 10. For example, as shown in Figures 6 and 8A, with the first direction X as the column direction and the second direction Y as the row direction, when a plurality of light-emitting components 10 are arranged in an array in the form of four rows and five columns, the collimating lens 30 includes four first sub-collimating portions 311 and five second sub-collimating portions 321. For another example, as shown in Figure 13, the arrangement of the plurality of light-emitting components 10 is five rows and seven columns. In this case, as shown in Figures 10 to 12, the collimating lens 30 includes five first sub-collimating portions 311 and seven second sub-collimating portions 321. The present disclosure does not limit the number of the first sub-collimating portions 311 and the second sub-collimating portions 321, and can be set according to demand.

[0146] In some embodiments, when the plurality of light-emitting components 10 are arranged in a uniform array, that is, when the row spacing between any two adjacent light-emitting components 10 is equal and the column spacing between any two adjacent light-emitting components 10 is also equal, the distance between the central axes of any two adjacent first sub-collimating portions 311 is equal, and the distance between the central axes of any two adjacent second sub-collimating portions 321 is also equal.

[0147] In some embodiments, the plurality of light-emitting components 10 are arranged in a non-uniform array. That is, the row spacing or column spacing between any two light-emitting components 10 is different. Thus, a first sub-collimation portion 311 may be provided for each row of light-emitting components 10, and a second sub-collimation portion 321 may be provided for each column of light-emitting components 10.

[0148] In some embodiments, as shown in Figures 11 and 14, the first sub-collimating portion 311 is a convex curved surface on the light-emitting side of the collimating lens 30 facing the light-emitting device 100. The curvature of this curved surface in the first direction X is variable. The first sub-collimating portion 311 can adjust the divergence of the laser light incident on the first sub-collimating portion 311 in the first direction X, reducing the diffusion angle of the laser light in the first direction X, thereby achieving collimation of the laser light in the first direction X. The curvature of this curved surface in the second direction Y is constant. For example, a point is selected on the curved surface, and a line segment is formed from this point along the second direction Y. The curvature of each point on the line segment is the same. Because the curvature of each point on the first sub-collimating portion 311 in the second direction Y is the same, the first sub-collimating portion 311 cannot collimate the laser light in the second direction Y. Due to the refraction of the laser light, the diffusion angle of the laser light in the second direction Y decreases after passing through the first sub-collimating portion 311.

[0149] In some embodiments, as shown in Figures 12 and 15, the second sub-collimating portion 321 is a convex curved surface on the light-emitting side of the collimating lens 30 away from the light-emitting device 100. The curvature of the curved surface in the second direction Y is a variable value. The second sub-collimating portion 321 can adjust the divergence of the laser incident on the second sub-collimating portion 321 in the second direction Y, reduce the diffusion angle of the laser in the second direction Y, and thus achieve collimation of the laser in the second direction Y. The curvature of the curved surface in the first direction X is a constant value. For example, a point is selected on the curved surface, and a line segment is extended from the point along the first direction X, and the curvature of each point on the line segment is the same. The second sub-collimating portion 321 cannot change the diffusion angle of the laser in the first direction X.

[0150] In some embodiments, the curvature of the first sub-collimating portion 311 and the second sub-collimating portion 321 in the first direction X may also be a fixed value. In this case, the curved surface may be in an arc shape.

[0151] In some embodiments, as shown in Figures 14 and 15, the first sub-collimation portion 311 collimates the laser light in the fast axis direction, adjusting the laser light's diffusion angle in the first direction X from the first diffusion angle θ1 to 0°. The first sub-collimation portion 311 refracts the laser light in the slow axis direction, adjusting the diffusion angle of the refracted laser light in the second direction Y from the second diffusion angle θ2 to the third diffusion angle θ3. The refracted laser light is then collimated by the second sub-collimation portion 321, adjusting the laser light's diffusion angle in the second direction Y from the third diffusion angle θ3 to 0°.

[0152] In some embodiments, the third diffusion angle θ3 is greater than 0° and less than or equal to 10°. For example, the third diffusion angle θ3 is 1°, 3°, 5°, 7°, and 10°. If the third diffusion angle θ3 is greater than 10°, the refracted laser light may strike the edge of the collimating lens 30 and thus fail to be collimated by the second sub-collimating portion 321.

[0153] In some embodiments, as shown in FIG16 , the spot shape formed by the laser after passing through the collimating lens 30 is rectangular, and the ratio between the length of the spot in the fast axis direction and the length in the slow axis direction meets the preset conditions to improve the homogenization effect of the laser.

[0154] The preset condition is: D1×tanθ1=K1×(D1×tanθ2+D2×tanθ3).

[0155] D1 is the optical path from the laser light emitted by the light-emitting component 10 to the first sub-collimating portion 311. The thickness of the collimating lens 30 is defined as the second distance D2. The second distance D2 is the maximum distance between the first sub-collimating portion 311 and the second sub-collimating portion 321 along the direction from the first sub-collimating portion 311 to the second sub-collimating portion 321. For example, as shown in Figures 14 and 15, in the third direction Z, the distance between the lowest point of the first sub-collimating portion 311 and the highest point of the second sub-collimating portion 321 is the second distance D2. The first diffusion angle θ1 is the diffusion angle of the laser light emitted by the light-emitting component 10 in the fast axis direction. The second diffusion angle θ2 is the diffusion angle of the laser light emitted by the light-emitting component 10 in the slow axis direction. The third diffusion angle θ3 is the diffusion angle of the laser light emitted by the light-emitting component 10 in the slow axis direction after passing through the first sub-collimating portion 311. The third diffusion angle θ3 can be understood as the refraction angle of the laser light entering the first sub-collimating portion 311.

[0156] K1 is a first coefficient, and K1 is greater than or equal to 0.2 and less than or equal to 5.0 (0.2≤K≤5.0), for example, K1=0.2, 0.9, 1.0, 1.2 or 5.0, and the first coefficient K1 can be set according to the determination.

[0157] It should be noted that the first coefficient K1 is equal to the ratio between the length of the light spot in the fast axis direction and the length in the slow axis direction after passing through the second collimating section 32. When the first coefficient K1 is equal to 1, the light spot is square in shape, with the fast and slow axis lengths being equal. When K1 is greater than 1, the light spot is rectangular in shape, with the fast axis length being greater than the slow axis length. When K1 is less than 1, the light spot is rectangular in shape, with the fast axis length being less than the slow axis length. If the first coefficient K1 is less than 0.2, the fast axis length is much smaller than the slow axis length. If the first coefficient K1 is greater than 5.0, the fast axis length is much larger than the slow axis length, which is detrimental to light spot homogenization and speckle reduction.

[0158] In some embodiments, the first distance D1 is greater than or equal to 2 mm and less than or equal to 20 mm (2 mm ≤ D1 ≤ 20 mm). For example, the first distance D1 is 2 mm, 4 mm, 8 mm, 15 mm, and 20 mm.

[0159] If the first distance D1 is less than 2 mm, the light spot is too small, reducing the imaging quality of the projection device 1. If the first distance D1 is greater than 20 mm, the optical path is too long, and the laser light emitted by one light-emitting chip 11 may enter the first sub-collimating portion 311 and the second sub-collimating portion 321 corresponding to the adjacent light-emitting chip 11, thereby reducing the imaging quality of the projection device 1 and hindering the miniaturization of the light-emitting device 100. If the first distance D1 is less than 2 mm, the distance between the collimating lens 30 and the light-emitting component 10 along the third direction Z is too small, thereby affecting the optical path of the laser light. If the first distance D1 is greater than 20 mm, the distance between the collimating lens 30 and the light-emitting component 10 along the third direction Z is too large, thereby hindering the miniaturization of the light-emitting device 100.

[0160] In some embodiments, the second distance D2 is greater than or equal to 2 mm and less than or equal to 20 mm (2 mm ≤ D2 ≤ 20 mm). For example, the second distance D2 is 2 mm, 4 mm, 8 mm, 15 mm, and 20 mm. If the second distance D2 is less than 2 mm, the thickness of the collimating lens 30 is too small, resulting in a too small light spot, which reduces the imaging quality of the projection device 1. If the second distance D2 is greater than 20 mm, the thickness of the collimating lens 30 is too large, which is not conducive to the miniaturization of the light-emitting device 100 and results in an excessively long optical path. As a result, the laser light emitted by one light-emitting chip 11 may enter the second collimating portion 32 corresponding to the light-emitting chip 11 adjacent to the light-emitting chip 11, thereby reducing the imaging quality of the projection device 1.

[0161] In some embodiments, as shown in FIG14 , along the first direction X, the width L1 of the first sub-collimating portion 311 is greater than or equal to the product of twice the first distance D1 and the tangent of the first diffusion angle θ1 (L1 ≥ 2D1 × tanθ1). Thus, along the first direction X, the length of the spot formed by the laser light at the first sub-collimating portion 311 is less than or equal to the width L1 of the first sub-collimating portion 311. Laser light in the fast axis direction can be fully received and collimated by the first sub-collimating portion 311, thereby improving the light utilization efficiency of the light-emitting device 100 and reducing stray light and bright spots caused by stray light.

[0162] In some embodiments, the width L1 of the first sub-collimating portion 311 is greater than or equal to 1 mm and less than or equal to 20 mm (1 mm ≤ L1 ≤ 20 mm). If the width L1 of the first sub-collimating portion 311 is less than 1 mm, it is difficult for the entire laser beam to enter the first sub-collimating portion 311. If the width L1 of the first sub-collimating portion 311 is greater than 20 mm, it is not conducive to the miniaturization of the light-emitting device 100.

[0163] In some embodiments, as shown in FIG15 , along the second direction Y, the width L2 of the second sub-collimation portion satisfies: 2D1×tanθ2+2D2×tanθ3≤L2. Thus, along the second direction Y, the length of the spot formed by the laser light at the second sub-collimation portion 321 is less than or equal to the width L2 of the second sub-collimation portion 321. The laser light in the slow axis direction can be fully received and collimated by the second sub-collimation portion 321, thereby improving the light utilization efficiency of the light-emitting device 100 and reducing stray light and bright spots caused by stray light.

[0164] In some embodiments, the width L2 of the second sub-collimating portion is greater than or equal to 1 mm and less than or equal to 20 mm (1 mm ≤ L2 ≤ 20 mm). If the width L2 of the second sub-collimating portion is less than 1 mm, it is difficult for the entire laser beam to enter the first sub-collimating portion 311. If the width L2 of the second sub-collimating portion is greater than 20 mm, it is not conducive to the miniaturization of the light-emitting device 100.

[0165] In some embodiments, as shown in FIG. 16 to FIG. 18 , by adjusting the curvature radius R1 of the first sub-collimating portion 311 and the curvature radius R2 of the second sub-collimating portion 321 , the shape of the light spot emitted from the collimating lens 30 can be adjusted to obtain a square light spot or a rectangular light spot.

[0166] In some embodiments, the curvature radius R1 of the first sub-collimating portion 311 satisfies: R1 / (n1-n2)=D1, where n1 represents the refractive index of the collimating lens 30, and n2 represents the refractive index of air.

[0167] In some embodiments, the curvature radius R2 of the second sub-collimating portion 321 satisfies: R2 / (n1-n2)=n1×D1+D2.

[0168] In some embodiments, the radius of curvature R1 of the first sub-collimating portion 311 is greater than or equal to 2 mm and less than or equal to 20 mm (2 mm ≤ R1 ≤ 20 mm). The radius of curvature R2 of the second sub-collimating portion 321 satisfies the requirement of greater than or equal to 2 mm and less than or equal to 20 mm (2 mm ≤ R2 ≤ 20 mm). The radius of curvature R2 of the second sub-collimating portion 321 is greater than the radius of curvature R1 of the first sub-collimating portion 311 (R2>R1).

[0169] In some embodiments, as shown in FIG. 16, when the light-emitting component 10 includes a first light-emitting component 101, a second light-emitting component 102, and a third light-emitting component 103, the shapes and sizes of the three-color light spots formed after the laser emitted by the light-emitting component 10 passes through the collimating lens 30 are the same respectively.

[0170] In some embodiments, for the three light-emitting components 10, corresponding collimating lenses 30 can be respectively used to collimate the laser in the fast-axis direction and the slow-axis direction to form light spots of various different shapes and sizes.

[0171] In some embodiments, the white light emitted by the light-emitting device 100 is used as a light source, and the red laser, green laser, and blue laser emitted by the light-emitting component 10 need to be mixed in the same proportion. However, due to the performance differences of different color light-emitting chips, as shown in FIG. 5E, compared with the green light-emitting chip 112 and the blue light-emitting chip 113, the light-emitting device 100 includes more red light-emitting chips 1110. Correspondingly, the number of red light spots is greater than the number of blue light spots or green light spots.

[0172] In some embodiments, as shown in FIG. 17, the laser emitted by the first light-emitting component 101 forms a first light spot 51 (e.g., a red light spot), the laser emitted by the second light-emitting component 102 forms a second light spot 52 (e.g., a blue light spot), and the laser emitted by the third light-emitting component 103 forms a third light spot 53 (e.g., a green light spot). The number of the first light spots 51 is greater than the number of the second light spots 52 and the number of the third light spots 53. By reducing the length of the first light spot 51 in the row direction (slow-axis direction), the length of the first light spot 51 in the column direction (fast-axis direction) is made equal to that of the second light spot 52 or the third light spot 53, so that the length of the first light spot 51 in the fast-axis direction is greater than the length in the slow-axis direction.

[0173] For example, define the first sub-distance D 11 as the optical path from the first light-emitting component 101 to the first sub-collimating portion 311, and the first sub-thickness D 21 as the thickness of the collimating lens 30 (the first collimating lens) corresponding to the first light-emitting component 101.

[0174] The first sub-distance D 11 and the first sub-thickness D 21 satisfy: D 11 ×tanθ1 = K2 × (D 11 ×tanθ2 + D 21 ×tanθ3). Here, K2 is the second coefficient. The second coefficient K2 is greater than 1.0 and less than or equal to 5.0 (1.0 < K2 ≤ 5.0). The second coefficient K2 is greater than the first coefficient K1 (K2 > K1). In this way, the length of the first light spot 51 in the fast-axis direction can be made greater than the length in the slow-axis direction.

[0175] Define the second sub-distance D 12 as the optical path from the second light-emitting component 102 to the first sub-collimating portion 311, and the second sub-thickness D 22 is the thickness of the collimating lens 30 corresponding to the second light-emitting component 102.

[0176] The second sub-distance D 12 and the second sub-thickness D 22 satisfy: D 12 ×tanθ1 = K1×(D 12 ×tanθ2 + D 22 ×tanθ3). In this way, the length of the first light spot 51 in the column direction is made equal to that of the second light spot 52.

[0177] Define the third sub-distance D 13 as the optical path from the third light-emitting component 103 to the first sub-collimating portion 311, and the third sub-thickness D 23 is the thickness of the collimating lens 30 corresponding to the third light-emitting component 103.

[0178] The third sub-distance D 13 and the third sub-thickness D 23 satisfy: D 13 ×tanθ1 = K1×(D 13 ×tanθ2 + D 23 ×tanθ3). In this way, the length of the first light spot 51 in the column direction is made equal to that of the third light spot 53.

[0179] In some embodiments, as shown in FIG. 18, the number of the first light spots 51 is greater than the number of the second light spots 52 and the number of the third light spots 53. By reducing the length of the first light spots 51 in the column direction and making the length in the column direction equal to that of the second light spots 52 (or the third light spots 53), the length of the first light spots 51 in the fast axis direction is made less than the length of the first light spots 51 in the slow axis direction.

[0180] In some embodiments, the first sub-distance D 11 and the first sub-thickness D 21 satisfy: D 11 ×tanθ1 = K3×(D 11 ×tanθ2 + D​​​​​​and the second sub-thickness D 22 Satisfied: D 12 ×tanθ1=K1×(D 12 ×tanθ2+D 22 ×tanθ3); in this way, the length of the first light spot 51 in the column direction is equal to that of the second light spot 52.

[0182] The third sub-distance D 13 and the third sub-thickness D 23 Satisfied: D 13 ×tanθ1=K1×(D 13 ×tanθ2+D 23 ×tanθ3). In this way, the length of the first light spot 51 in the column direction is equal to that of the third light spot 53.

[0183] As shown in Figure 19 , due to the large diffusion angle of the light-emitting component 10 in the fast-axis direction, the spot size increases as the laser propagation path lengthens. After the laser is reflected by the reflective lens 20 and passes through the cover plate 43, the resulting spot size is relatively large. This causes a portion of the laser light to extend beyond the collimation area, which corresponds to the area marked by the dotted ellipse in Figure 19 . This portion of the laser light is difficult to collimate by the collimating lens 30 and ultimately becomes stray light.

[0184] As shown in Figure 20, the spot size (e.g., the length of the major axis of the elliptical spot) formed by the laser light emitted by the light-emitting assembly 10 on the reflective surface of the reflective lens 20 is a first length N1. The spot size after reflection by the reflective lens 20 is a second length N2. Because a portion of the laser light reflected by the reflective surface cannot be utilized by the collimating lens 30, the collimating lens 30 can only collimate a spot size of a third length N3. The remaining laser light is not utilized and becomes stray light. The third length N3 is smaller than the second length N2.

[0185] Therefore, in order to solve the above problems, the collimating lens in some embodiments of the present disclosure may also have other structures.

[0186] In some embodiments, as shown in Figures 21 to 23, the collimating lens 30 includes a first area A1 and a second area A2. The first area A1 and the second area A2 are arranged along a first direction X. The second area A2 is located on at least one side of the first area A1. For example, the second area A2 is located only on one side of the first area A1, or, as shown in Figures 22, 24, and 25, the second area A2 is located on both sides of the first area A1.

[0187] It should be noted that the laser light emitted by the light-emitting assembly 10 has a certain diffusion angle. Laser light with a smaller diffusion angle can be incident on the first area A1, while laser light with a larger diffusion angle can be incident on the second area A2. Laser light with a diffusion angle greater than or equal to a preset value can be referred to as laser light with a larger diffusion angle; laser light with a diffusion angle less than the preset value can be referred to as laser light with a larger diffusion angle.

[0188] For example, taking the case where the diffusion angle of the laser emitted by the light-emitting component 10 is less than or equal to 35°, the laser with a diffusion angle less than 30° can be incident on the first area A1, and this part of the laser can be collimated by the collimating lens 30, while the laser with a diffusion angle between 30° and 35° is incident on the second area A2, and this part of the laser can be understood as stray light.

[0189] As shown in Figures 21 and 22, the collimating lens 30 further includes an optical path adjustment component 13. The optical path adjustment component 13 is disposed in the second area A2. The optical path adjustment component 13 is configured to adjust the optical path of the laser light incident on the second area A2. The optical path adjustment component 13 allows the laser light, after adjusting its optical path, to enter the first area A1 and be collimated by the collimating lens 30, resulting in collimated light. This improves the light energy utilization efficiency of the light-emitting device 100. This also improves the image quality and contrast of the projection device 1, helping to reduce the heat generated by the projection device 1.

[0190] It should be noted that the optical path adjustment component 13 can adjust the optical path by both reflection and scattering. In some examples, the optical path adjustment component 13 has a high reflectivity and a low refractive index for incident laser light. For example, the reflectivity is greater than or equal to 80% to facilitate reflection of the laser light. In other examples, the optical path adjustment component 13 includes a reflective surface or a scattering surface. For example, the optical path adjustment component 13 includes a total reflection surface. Of course, the optical path adjustment component 13 can also adjust the optical path in other ways, and this disclosure is not limited thereto.

[0191] In some embodiments, as shown in Figures 21 to 23, the collimating lens 30 further includes at least one target curved surface 121. The target curved surface 121 is located on the side of the collimating lens 30 away from the light incident surface and is located in the first area A1. The target curved surface 121 is convex toward the side away from the light incident surface. The target curved surface 121 can be an aspherical surface or a freeform surface. The target curved surface 121 compresses and collimates the laser light emitted by the corresponding light-emitting component 10 in the first direction X to reduce the divergence angle of the laser light in the first direction X. The target curved surface 121 is disposed corresponding to the first area A1. Along the first direction X, the second area A2 is located on at least one side of the target curved surface 121. The optical path adjustment component 13 reflects stray light from the light-emitting component 10 in the first direction X and adjusts the optical path of this portion of the stray light so that the stray light after the adjusted optical path can enter the first area A1 and be collimated by the target curved surface 121 to become collimated light, thereby improving the light energy utilization efficiency of the light-emitting device 100.

[0192] In some embodiments, the thickness of the target curved surface is greater than or equal to 0.8 mm and less than or equal to 1.1 mm. The minimum distance between the target curved surface 121 and the light incident surface is greater than or equal to 0.8 mm and less than or equal to 1.5 mm.

[0193] As shown in FIG. 24 to FIG. 26 , the target curved surface 12 bulges in a direction away from the light emitting component 10 . Of course, the target curved surface 12 may also bulge in a direction close to the light emitting component 10 .

[0194] In some embodiments, as shown in FIG23 , when the light-emitting device 100 includes multiple light-emitting components 10 and multiple target curved surfaces 121, the multiple target curved surfaces 121 correspond to the multiple light-emitting components 10, and the arrangement direction of the multiple target curved surfaces 121 is the same as the arrangement direction of the light-emitting components 10. The multiple target curved surfaces 121 and the multiple light-emitting components 10 are respectively arranged along the second direction Y. It should be noted that the multiple light-emitting components 10 can be arranged in an array on the base plate 5, and the light-emitting components 10 emit laser light along the first direction X.

[0195] In some embodiments, as shown in Figures 21, 22, and 24, the optical path adjustment component 13 includes a first sub-adjustment component 131. The first sub-adjustment component 131 is configured to adjust the optical path of the laser light incident on the first sub-adjustment component 131. For example, the collimating lens 30 also includes a light incident surface 111. The side of the collimating lens 30 facing the light-emitting component 10 is recessed in a direction away from the light-emitting component 10 to form a groove 1310. The bottom surface of the groove 1310 is the light incident surface 111. Along the first direction X, the length of the light incident surface 111 is the same as the length of the first area A1. The sidewalls of the groove 1310 are the first sub-adjustment component 131.

[0196] Of the laser light emitted by the light-emitting assembly 10, laser light with a smaller diffusion angle directly enters the light-entering surface 111 (i.e., the laser light with a smaller diffusion angle enters the first region). This portion of laser light passes through the light-entering surface 111 and enters the interior of the collimating lens 30, where it is collimated by the target curved surface 121 before being emitted. Laser light with a larger diffusion angle enters the first sub-adjustment component 131 (i.e., the laser light with a larger diffusion angle enters the second region). This adjusts the optical path of the laser light, allowing it to enter the light-entering surface 111 and enter the interior of the collimating lens 30. It is then collimated by the target curved surface 121 to become collimated light, thereby improving the light energy utilization efficiency of the light-emitting device 100.

[0197] In some embodiments, the sidewalls of the groove are coated with a reflective film to form the first sub-adjustment component 131. In this case, the first sub-adjustment component 131 serves as an external reflective surface. The first sub-adjustment component 131 reflects incident laser light. Alternatively, at least a portion of the sidewalls of the groove are concave and at least a portion are convex, forming a concave-convex microstructure, thereby forming the first sub-adjustment component 131. In this way, the first sub-adjustment component 131 can reflect and scatter incident laser light.

[0198] Figure 22 illustrates the process of stray light processing by the collimating lens 30. As shown in Figure 22, M1 represents the normal to the first sub-adjustment component 131, S1 represents stray light, S2 represents the laser light reflected by the first sub-adjustment component 131, S3 represents collimated light, θ11 represents the angle of incidence, and θ12 represents the angle of reflection. The first sub-adjustment component 131 is an external reflective surface. Stray light S1 incident on the first sub-adjustment component 131 is reflected by the first sub-adjustment component 131. The reflected laser light S2 then passes through the light-entry surface 111 and is incident on the target curved surface 121. After being collimated by the target curved surface 121, it becomes collimated light S3.

[0199] It should be noted that, in order to clearly illustrate the optical path of stray light in the light-emitting device 100, Figure 22 only shows the stray light incident on the first sub-adjustment component 131, omitting the laser directly incident on the light incident surface 111. The collimating lens 30 will also collimate the laser directly incident on the light incident surface 111.

[0200] In some embodiments, as shown in Figures 22 and 24, the first included angle α between the first sub-adjustment component 131 and the light incident surface 111 is greater than or equal to 110° and less than or equal to 140° (110°≤α≤140°). It can also be understood that the included angle between the first sub-adjustment component 131 and the thickness direction of the collimating lens 30 is greater than or equal to 40° and less than or equal to 70°.

[0201] If the first angle α is less than 110° or greater than 140°, it is easy to cause some stray light to have difficulty entering the target curved surface 121 , and thus difficult to become collimated light, thereby reducing the light energy utilization rate of the light emitting device 100 .

[0202] In some embodiments, the thickness D2 of the collimating lens 30 is greater than or equal to 1.5 mm and less than or equal to 2.5 mm. As shown in FIG24 , along the thickness direction of the collimating lens 30, the depth H1 of the groove is greater than or equal to 0.5 mm and less than or equal to 0.7 mm (0.5 mm ≤ H1 ≤ 0.7 mm). This allows the collimating lens 30 to receive more laser light emitted by the light-emitting assembly 10 and increases the intensity of the collimating lens 30.

[0203] If the groove depth H1 is less than 0.5 mm, the optical path of the laser will be affected, reducing the collimating effect of the collimating lens 30 ; if the groove depth H1 is greater than 0.7 mm, the strength of the collimating lens 30 will be low, which is not conducive to the miniaturization of the light emitting device 100 .

[0204] Since the laser continues to diverge before entering the collimating lens 30, the size of the light spot increases with the increase of the laser propagation distance. The width of the light incident surface 111 is related to the optical path of the laser. The third distance is defined as the propagation distance between the light-emitting side of the self-luminous component 10 and the light incident surface 111 of the collimating lens 30. The third distance can be understood as the optical path. The third distance is greater than or equal to 1.9 mm and less than or equal to 2.2 mm. Under this optical path, along the first direction X, the width of the light incident surface 111 is greater than or equal to 3.0 mm and less than or equal to 3.4 mm. In this way, by reducing the third distance as much as possible, it is beneficial to the miniaturization of the light-emitting device 100.

[0205] If the third distance is less than 1.9 mm, the optical path of the laser is too short, resulting in a too small light spot, which reduces the imaging quality of the projection device 1; if the third distance is greater than 2.2 mm, the optical path of the laser is too long, which is not conducive to the miniaturization of the light-emitting device 100, and causes the optical path to be too long, so that the laser emitted by one light-emitting chip 11 may enter the second collimation portion 312 corresponding to the light-emitting chip 11 adjacent to the light-emitting chip 11, thereby reducing the imaging quality of the projection device 1.

[0206] In some embodiments, as shown in FIG24 , the target curved surface 121 is disposed opposite the light incident surface 111 , and the width of the target curved surface 121 is the same as the width of the light incident surface 111 . In the first direction X, the width W1 of the target curved surface 121 is greater than or equal to 3.0 mm and less than or equal to 3.4 mm (3.0 mm ≤ W1 ≤ 3.4 mm). It should be noted that in the first direction X, the distance between the two end edges of the target curved surface 121 is the width W1 of the target curved surface 121 .

[0207] In some embodiments, the width of the target curved surface 121 is smaller than the width of the light-entering surface 111. This facilitates miniaturization of the light-emitting device 100 while allowing the target curved surface 121 to collimate the laser light. For example, the width of the light-entering surface 111 is 3.2 mm, and the width of the target curved surface 121 is 3.0 mm. For another example, the width of the light-entering surface 111 is 3.0 mm, and the width of the target curved surface 121 is 2.8 mm. For another example, the width of the light-entering surface 111 is 3.6 mm, and the width of the target curved surface 121 is 3.4 mm.

[0208] In some embodiments, as shown in Figures 25 and 26 , the optical path adjustment component 13 includes a second sub-adjustment component 132. For example, the collimating lens 30 further includes a light incident surface 111. The light incident surface 111 is located on the side of the first and second areas A1 and A2 that faces the light-emitting assembly 10. In this case, the second sub-adjustment component 132 is a sidewall of the collimating lens 30 in the first direction X and is configured to adjust the optical path of the laser beam incident on the second area A2 so that the adjusted laser beam can enter the first area A1.

[0209] Laser light emitted by the light-emitting assembly 10 enters the collimating lens 30 through the light-entering surface 111. Laser light incident on the first area A1 is collimated by the target curved surface 121. Laser light incident on the second area A2 is reflected by the second sub-adjustment component 132 back to the first area A1, where it is collimated by the target curved surface 121.

[0210] Among the laser beams emitted by the light-emitting assembly 10, laser beams with a smaller diffusion angle are directly incident on the light-entering surface 111 (i.e., the laser beams with a smaller diffusion angle are incident on the first zone). After passing through the light-entering surface 111, this portion of laser beams enters the interior of the collimating lens 30, is collimated by the target curved surface 121, and is then emitted. Laser beams with a larger diffusion angle are incident on the light-entering surface 111 located in the second zone A2 (i.e., the laser beams with a larger diffusion angle are incident on the second zone). After passing through the light-entering surface 111, this portion of laser beams enters the interior of the collimating lens 30 and is incident on the second sub-adjustment component 132. The second sub-adjustment component 132 adjusts the optical path of the laser beams incident on the second sub-adjustment component 132, so that the laser beams with the adjusted optical path are incident on the light-entering surface 111 and enter the interior of the collimating lens 30, where they are collimated by the target curved surface 121 and become collimated light, thereby improving the light energy utilization efficiency of the light-emitting device 100.

[0211] Figure 25 illustrates the process of stray light processing by the collimating lens 30. M2 represents the normal to the light-entering surface 111, M3 represents the normal to the second sub-adjustment component 132, S4 represents stray light, S5 represents laser light incident from the light-entering surface 111, S6 represents laser light reflected by the second sub-adjustment component 132, S7 represents collimated light, θ13 represents the incident angle of the stray light at the light-entering surface 111, θ14 represents the refraction angle, θ15 represents the incident angle of the laser light exiting the second sub-adjustment component 132, and θ16 represents the reflection angle. The second sub-adjustment component 132 is an internal reflection surface. Stray light S4 incident on the light-entering surface 111 in the second area A2 is refracted there and enters the interior of the collimating lens 30. Laser light S5 enters the second sub-adjustment component 132 and is reflected. The reflected laser light S6 then enters the target curved surface 121 in the first area A1 and is collimated by the target curved surface 121 to become collimated light S7.

[0212] It should be noted that, in order to clearly illustrate the optical path of stray light in the light-emitting device, Figure 25 only shows the stray light to the light incident surface 111 located in the second area A2, and omits the laser directly incident on the light incident surface 111 located in the first area A1. The collimating lens 30 will also collimate the laser incident on the light incident surface 111 located in the first area A1.

[0213] In some embodiments, as shown in Figures 25 and 27, the second angle β between the second sub-adjustment component 132 and the light incident surface 111 is greater than or equal to 40° and less than or equal to 50° (40°≤β≤50°). In this way, as much stray light as possible can be incident on the target curved surface 12, thereby allowing the stray light to be collimated through the target curved surface 121.

[0214] If the second angle β is less than 40° or greater than 50°, the stray light incident on the target curved surface 121 may be reduced, thereby reducing the light energy utilization efficiency of the light emitting device 100 .

[0215] In some embodiments, as shown in FIG27 , in the third direction Z, the vertical distance between the light incident surface 111 and the vertex (highest point) of the target curved surface 121 is the thickness of the collimating lens 30, which is the second distance D2. The second distance D2 is greater than or equal to 1.5 mm and less than or equal to 2.0 mm (1.5 mm ≤ H2 ≤ 2.0 mm). If the second distance D2 is less than 1.5 mm, the thickness of the collimating lens 30 is too small, resulting in a too small light spot, which reduces the imaging quality of the projection device 1. If the second distance D2 is greater than 2.0 mm, the thickness of the collimating lens 30 is too large, which is not conducive to the miniaturization of the light-emitting device 100 and results in an excessively long optical path. As a result, the laser light emitted by one light-emitting chip 11 may enter the second collimating portion 312 corresponding to the adjacent light-emitting chip 11 of the light-emitting chip 11, thereby reducing the imaging quality of the projection device 1.

[0216] The vertical distance between the vertex of the target curved surface 121 and the lowest point of the target curved surface 121 is the third thickness H3 of the target curved surface 121. The thickness H3 of the target curved surface 121 is greater than or equal to 0.8 mm and less than or equal to 1.1 mm (0.8 mm ≤ H3 ≤ 1.1 mm). If the thickness H3 of the target curved surface 121 is less than 0.8 mm, the thickness of the target curved surface 121 is too small, and the target curved surface 121 has a poor collimation effect on the laser. If the thickness H3 of the target curved surface 121 is greater than 1.1 mm, the thickness of the target curved surface 121 is too large, and the optical path of the laser is too long, which is not conducive to the miniaturization of the light-emitting device 100.

[0217] The distance between the lowest point of the target curved surface 121 and the light incident surface 111 is a fourth distance H4. It should be noted that when the second distance D2 and the thickness H3 of the target curved surface 121 are determined, the range of values ​​for the fourth distance H4 is determined. The fourth distance H4 is greater than or equal to 0.7 mm and less than or equal to 0.9 mm (0.7 mm ≤ H4 ≤ 0.9 mm).

[0218] It should be noted that the width of the light incident surface 111 is greater than the width of the target curved surface 121 .

[0219] In some embodiments, as shown in Figures 28 and 29, the second area A2 includes a first collimating surface 14 (microstructure surface), which is located on the side of the collimating lens 30 away from the light-emitting component 10 and is configured to collimate the laser incident on the first collimating surface 14.

[0220] Due to the existence of manufacturing errors, the parameters of the collimating lens 30 may exceed the design range, thereby causing part of the stray light after the optical path is adjusted by the optical path adjustment component 13 to be incident on a position outside the target curved surface 121. For example, part of the stray light after being reflected by the first sub-adjustment component 131 or the second sub-adjustment component 132 is incident on the second area A2 on the other side. Therefore, by providing a first collimating surface 14 on the side of the second area A2 away from the light-emitting component 10, this part of the stray light can be collimated by the first collimating surface 14.

[0221] In one embodiment, as shown in Figures 28 and 29 , in the first direction X, the width W2 of the first collimating surface 14 is greater than or equal to 0.3 mm and less than or equal to 0.4 mm (0.3 mm ≤ W1 ≤ 0.4 mm). If the width W2 of the first collimating surface 14 is less than 0.3 mm, a large amount of stray light will not be incident on the first collimating surface 14, and the first collimating surface 14 will have a poor effect on collimating some of the stray light. If the width W2 of the first collimating surface 14 is greater than 0.4 mm, the size of the target curved surface 121 will be reduced, which is not conducive to the target curved surface 121 collimating the stray light.

[0222] In some embodiments, as shown in FIG30 , the first collimating surface 14 includes a diffractive optical element 141 (DOE). The diffractive optical element 141 has an uneven surface, and the surface of the diffractive optical element 141 can be configured according to parameters such as the wavelength, beam quality, and near-field light intensity distribution of the laser. The diffractive optical element 141 regulates the phase of stray light. When the stray light passes through the diffractive optical element 141, the stray light can be formed into a collimated beam at a predetermined distance. The effect of the diffractive optical element 141 on the processing of stray light is shown in FIG30 .

[0223] 31 and 32 , a relief structure is provided on the surface of the diffractive optical element 141. The relief is formed on the side of the diffractive optical element 141 facing away from the light incident surface 111 by etching, and the depth of the relief is submicron level.

[0224] It should be noted that Figures 31 and 32 illustrate the diffractive optical element 141 using a relief structure having rectangular steps as an example. In some embodiments, the relief structure may also have other shapes, such as semicircular steps or triangular steps. Providing a relief structure on the surface of the diffractive optical element 141 can enhance the diffractive optical element's 141 collimation effect on stray light.

[0225] It should be noted that different relief shapes can be set according to parameters such as the wavelength, beam quality, and near-field light intensity distribution of the laser.

[0226] In some embodiments, as shown in FIG33 , the first collimating surface 14 includes a Fresnel structure surface 142. The Fresnel structure surface 142 is similar to a Fresnel lens. The Fresnel structure surface 142 is formed on the side of the second area A2 facing away from the light-emitting component 10 by etching. The Fresnel structure surface 142 includes a plurality of grooves, each having a different inclination angle. Each groove can be regarded as an independent small lens. When stray light with a predetermined diffusion angle passes through the Fresnel structure surface 142, it can be corrected into parallel light. The Fresnel structure surface 142 uses the principle of light refraction to collimate the stray light. The Fresnel structure surface 142 forms contours with different angles in the second area A2 as refractive surfaces to achieve collimation of the stray light.

[0227] In some embodiments, as shown in Figures 34 and 35 , the collimating lens 30 further includes a second collimating surface 151. The second collimating surface 151 is disposed on a side of the second area A2 facing away from the light-emitting assembly 10. The second collimating surface 151 is configured to collimate stray light incident on the second area A2. In this case, the optical path adjustment component 13 can be omitted.

[0228] For example, as shown in Figures 36 to 38, in the collimating lens 30, the second collimating surface 151 collimates the laser light incident on the second area A2 of the collimating lens 30, converting this portion of the laser light into collimated light, which helps improve the light energy utilization efficiency of the light-emitting device 100. In this way, while the size of the collimating lens 30 remains essentially unchanged, the second collimating surfaces 151 are added on both sides of the target curved surface 121. The second collimating surfaces 151 can collimate stray light not covered by the target curved surface 121, thereby collimating this portion of stray light into a usable beam, thereby improving the light energy utilization efficiency of the light-emitting device 100. In addition, the optical path of the laser light remains unchanged, and only the thickness of the second collimating surface 151 changes.

[0229] In some embodiments, the second collimating surface 151 includes a multifocal curved surface. The multifocal curved surface collimates stray light, thereby improving the collimation efficiency of the second collimating surface 151 for stray light, thereby improving the light energy utilization efficiency of the light emitting device 100. For example, the multifocal free-form surface includes a Fresnel structure surface.

[0230] For example, as shown in FIG36 , the second collimating surface 151 is a Fresnel structure surface, which collimates the incident stray light, turning the stray light into collimated light, thereby improving the light energy utilization rate of the light emitting device 100 .

[0231] It should be noted that any one of the technical solutions disclosed in the present disclosure can solve one or more of the above-mentioned technical problems and achieve certain purposes to a certain extent; multiple technical disclosures can also be combined into an overall solution to solve one or more of the above-mentioned technical problems and achieve certain invention purposes; some of the technical disclosures can also be selected to be combined into an overall solution, while adopting related technologies and deteriorated solutions, but the deterioration trend can be compensated by the means disclosed in this technology, and one or more of the above-mentioned technical problems can be solved to a certain extent as a whole and achieve certain invention purposes; each technical disclosure combined into a complete technical solution constitutes an organic and inseparable overall solution, which solves technical problems as a whole and achieves certain invention purposes.

[0232] Any technical disclosure in this disclosure, as well as the recombination of multiple technical disclosures, can form a complete technical solution and can solve one or more of the above-mentioned technical problems and achieve the purpose of the invention. They all belong to the content of this disclosure and are the content that is directly and unambiguously determined based on the content of this disclosure.

[0233] Those skilled in the art will understand that the scope of the present disclosure is not limited to the above specific embodiments, and that certain elements of the embodiments may be modified and replaced without departing from the spirit of the present disclosure. The scope of the present disclosure is limited by the appended claims.

Claims

1. A light emitting device, comprising: A plurality of light emitting chips configured to emit laser light; as well as A collimating lens is located at the light-emitting side of the plurality of light-emitting chips and is configured to receive lasers from the plurality of light-emitting chips and collimate incident lasers, wherein the collimating lens comprises: The first collimating portion is a surface of the collimating lens facing the plurality of light-emitting chips, and is configured to: collimate the incident laser in a first direction, and reduce the diffusion angle of the incident laser in a second direction, so that the diffusion angle of the laser emitted from the first collimating portion in the first direction is reduced to 0°, and the diffusion angle of the laser emitted from the first collimating portion in the second direction is reduced, and the diffusion angle of the laser emitted from the first collimating portion in the second direction is greater than 0°; the diffusion angle of the laser incident to the first collimating portion in the first direction is greater than the diffusion angle in the second direction, the first direction is parallel to the fast axis direction of the laser incident to the first collimating portion, the second direction is parallel to the slow axis direction of the laser incident to the first collimating portion, and the first direction is perpendicular to the second direction; as well as The second collimating portion is a surface of the collimating lens away from the plurality of light-emitting chips and is spaced apart from the first collimating portion. The second collimating portion is configured as follows: in the second direction, the incident laser is collimated so that the diffusion angle of the laser emitted through the second collimating portion in the first direction remains unchanged, and the diffusion angle of the laser emitted through the second collimating portion in the second direction is reduced to 0°; and the change in the diffusion angle of the laser emitted from the second collimating portion in the second direction is greater than the change in the diffusion angle of the laser emitted from the first collimating portion in the second direction.

2. The light-emitting device according to claim 1, further comprising a reflective lens, wherein the reflective lens is disposed on the light-emitting side of the plurality of light-emitting chips and is configured to reflect the lasers emitted by the plurality of light-emitting chips to the collimating lens; the collimating lens and the reflective lens are arranged along a third direction; the third direction is perpendicular to the first direction and the second direction; wherein, The plurality of light emitting chips are arranged in an array along the first direction and the second direction; The first collimating portion includes a plurality of first sub-collimating portions; the plurality of first sub-collimating portions are arranged along the first direction and extend in the second direction, and any first sub-collimating portion of the plurality of first sub-collimating portions corresponds to a row of light-emitting chips arranged along the second direction; The second collimating portion includes a plurality of second sub-collimating portions, which are arranged along the second direction and extend in the first direction, and any second sub-collimating portion among the plurality of second sub-collimating portions corresponds to a row of light-emitting chips arranged along the first direction.

3. The light emitting device according to claim 2, wherein: The orthographic projection of the first sub-collimation portion on the plane formed by the first direction and the third direction is a curve; the projection of the first sub-collimation portion on the plane formed by the second direction and the third direction is a straight line; The projection of the second sub-collimation portion on the plane formed by the first direction and the third direction is a straight line; the projection of the second sub-collimation portion on the plane formed by the second direction and the third direction is a curve.

4. The light emitting device according to claim 2 or 3, wherein: Along the third direction, the optical path between any light emitting chip among the plurality of light emitting chips and the corresponding first sub-collimating portion and the thickness of the collimating lens satisfy the following formula: D1×tanθ1=K1×(D1×tanθ2+D2×tanθ3); Among them, D1 represents the optical path between the light-emitting chip and the first sub-collimation section; D2 represents the thickness of the collimating lens; θ1 represents the diffusion angle of the laser emitted by the light-emitting chip in the fast axis direction, θ2 represents the diffusion angle of the laser emitted by the light-emitting chip in the slow axis direction, θ3 represents the refraction angle formed by the laser emitted by the light-emitting chip after passing through the first sub-collimation section, and K1 represents the first coefficient; the first coefficient is equal to the ratio between the length of the light spot formed after passing through the second collimation section in the fast axis direction and the length in the slow axis direction; the first coefficient is greater than or equal to 0.2 and less than or equal to 5.

0.

5. The light emitting device according to claim 4, wherein: The optical path is greater than or equal to 2 mm and less than or equal to 20 mm, and the thickness of the collimating lens is greater than or equal to 2 mm and less than or equal to 20 mm.

6. The light emitting device according to claim 4 or 5, wherein: The plurality of light-emitting chips include: a first light-emitting chip, a second light-emitting chip and a third light-emitting chip; the number of the first light-emitting chips is greater than the number of the second light-emitting chips and the number of the third light-emitting chips; the first light-emitting chip is configured to emit red laser light; one of the second light-emitting chip and the third light-emitting chip emits blue laser light, and the other emits green laser light; The sub-optical path between the first light-emitting chip and the corresponding first sub-collimating portion and the thickness of the collimating lens satisfy at least one of the following: D 11 ×tanθ1=K2×(D 11 ×tanθ2+D2×tanθ3); or D 11 ×tanθ1=K3×(D 11 ×tanθ2+D2×tanθ3); Among them, D 11 represents the sub-optical path between the first light-emitting chip and the corresponding first sub-collimation part, K2 represents the second coefficient, the second coefficient K2 is greater than 1.0 and less than or equal to 5.0; K3 represents the third coefficient, the third coefficient K3 is greater than 0.2 and less than or equal to 1.0; the first coefficient includes the second coefficient and the third coefficient.

7. The light emitting device according to any one of claims 2 to 6, wherein: Along the first direction, a width of any first sub-collimation portion of the plurality of first sub-collimation portions is greater than or equal to 1 mm and less than or equal to 20 mm; Along the second direction, a width of any second collimating portion of the plurality of second sub-collimating portions is greater than or equal to 1 mm and less than or equal to 20 mm.

8. The light emitting device according to any one of claims 2 to 7, wherein: The curvature radius of any first sub-collimation portion among the multiple first sub-collimation portions is greater than or equal to 2 mm and less than or equal to 20 mm; the curvature radius of any second sub-collimation portion among the multiple second sub-collimation portions is greater than or equal to 2 mm and less than or equal to 20 mm; the curvature radius of the first sub-collimation portion is smaller than the curvature radius of the second sub-collimation portion.

9. The light emitting device according to claim 1, wherein: The plurality of light-emitting chips are configured to emit the laser light along a third direction, the third direction being perpendicular to the first direction and the second direction; the plurality of light-emitting chips are arranged in an array along the second direction and the third direction; The first collimating portion includes a plurality of first sub-collimating portions; the plurality of first sub-collimating portions are arranged along the first direction and extend in the second direction, and any first sub-collimating portion of the plurality of first sub-collimating portions corresponds to a row of core chips arranged along the first direction; The second collimating portion includes a plurality of second sub-collimating portions, which are arranged along the second direction and extend in the first direction, and any second sub-collimating portion among the plurality of second sub-collimating portions corresponds to a column of light-emitting chips arranged along the second direction.

10. The light emitting device according to any one of claims 1 to 10, wherein: The collimating lens comprises: a first region configured to collimate laser light incident to the first region; a second region located on at least one side of the first region in the first direction; and The optical path adjustment component is located in the second area and is configured to adjust the optical path of the laser incident on the second area so that the adjusted laser is incident on the first area.

11. The light emitting device according to claim 10, wherein: The collimating lens comprises a groove, and at least a portion of the collimating lens is recessed toward a side away from the plurality of light-emitting chips to form the groove; the groove comprises: a bottom surface, which is a light incident surface of the collimating lens and is located in the first area; and The side wall is a first sub-adjustment component, which is located in the second area and is configured to: adjust the optical path of the laser incident to the second area so that the laser incident to the second area is incident to the first area, and the optical path adjustment component includes the first sub-adjustment component.

12. The light emitting device according to claim 11, wherein: The first sub-adjustment component satisfies at least one of the following: A first included angle between the first sub-adjusting component and the light incident surface is greater than or equal to 110° and less than or equal to 40°; or, Along the thickness direction of the collimating lens, the height of the collimating portion is greater than or equal to 0.5 mm and less than or equal to 7 mm.

13. The light emitting device according to claim 11 or 12, wherein: The collimating lens includes a target curved surface, which is a side of the collimating lens away from the light incident surface and is located in the first zone, and the target curved surface protrudes toward the side away from the light incident surface; the thickness of the target curved surface is greater than or equal to 0.8 mm and less than or equal to 1.1 mm; along the thickness direction of the collimating lens, the minimum distance between the target curved surface and the light incident surface is greater than or equal to 0.8 mm and less than or equal to 1.5 mm.

14. The light emitting device according to claim 10, wherein: The optical path adjustment component includes a second sub-adjustment component; the second sub-adjustment component is the two side walls of the collimating lens in the first direction; the second sub-adjustment part is configured to: adjust the optical path of the laser incident to the second area so that the laser incident to the second area is incident to the first area; the collimating lens also includes a light incident surface, which is the side of the collimating lens facing the multiple light-emitting chips and is located in the first area and the second area.

15. The light emitting device according to claim 14, wherein: A second included angle β between the second sub-adjusting component and the light incident surface is greater than or equal to 40° and less than or equal to 50°.

16. The light emitting device according to claim 14 or 15, wherein: The collimating lens includes a target curved surface, which is a side of the collimating lens away from the light incident surface and is located in the first zone, and the target curved surface protrudes toward the side away from the light incident surface; the thickness of the target curved surface is greater than or equal to 0.8 mm and less than or equal to 1.1 mm; along the thickness direction of the collimating lens, the minimum distance between the target curved surface and the light incident surface is greater than or equal to 0.7 mm and less than or equal to 0.9 mm.

17. The light emitting device according to any one of claims 10 to 16, wherein: The thickness of the collimating lens is greater than or equal to 1.5 mm and less than or equal to 2.0 mm; the optical path between the multiple light-emitting chips and the light incident surface of the collimating lens is greater than or equal to 1.9 mm and less than or equal to 2.2 mm; in the first direction, the width of the first zone is greater than or equal to 3.0 mm and less than or equal to 3.4 mm.

18. The light emitting device according to any one of claims 10 to 17, wherein: The collimating lens also includes a microstructure surface, the microstructure is a side of the collimating lens away from the multiple light-emitting chips and is located in the second area, and the microstructure is configured to collimate the laser incident on the microstructure surface; the microstructure surface includes at least one of a Fresnel structure surface or a diffractive optical element.

19. A projection device, comprising: A light source, the light source being configured to emit an illumination light beam and comprising the light emitting device according to any one of claims 1 to 18; an optical modulation component, wherein the optical modulation component is configured to modulate the illumination light beam emitted by the light source to obtain a projection light beam; as well as A lens is configured to image the projection light beam.

20. A light emitting device, comprising: A plurality of light emitting chips configured to emit laser light; as well as A collimating lens is located at the light-emitting side of the plurality of light-emitting chips and is configured to receive lasers from the plurality of light-emitting chips and collimate incident lasers, wherein the collimating lens comprises: a first region configured to collimate laser light incident to the first region; a second area located at least on one side of the first area along the width direction of the collimating lens; and The optical path adjustment component is disposed in the second region and is configured to adjust the optical path of the laser beam incident on the second region so that the adjusted laser beam is incident on the first region.

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