Light source assembly and projection device

Abstract

The application relates to a light source assembly and a projection device. The light source assembly comprises a mounting cup, a light emitting source, a collimating mirror group and a first light absorbing layer. The light emitting source is arranged in the mounting cup; the collimating mirror group is arranged on the mounting cup and is located on the light emitting side of the light emitting source, and the collimating mirror group covers the light emitting range of the light emitting source; and the first light absorbing layer is arranged on the inner wall of the mounting cup. In the light source assembly, the light emitted by the light emitting source does not need to be reflected and refracted by the inner wall of the mounting cup when conducting in the mounting cup, the introduction of interference light can be reduced, the problem of light path crosstalk can be solved, and the projection imaging quality is improved. Meanwhile, the first light absorbing layer arranged on the inner wall of the mounting cup can absorb the light shot on the inner wall of the mounting cup, the light reflected on the inner wall of the mounting cup to form interference light is avoided, and the introduction of interference light components is further reduced.

Description

Technical Field

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

[0002] Projection devices can be used to project images onto a screen, offering an advantage in screen size compared to traditional flat panel displays. Meanwhile, with the rise of the metaverse concept, the comfortable wear and user experience of near-eye display devices such as AR / VR glasses, as a crucial medium for interaction between the virtual and real worlds, have become particularly important. As a core component of near-eye display devices, the micro-projection device within them is responsible for transmitting images.

[0003] However, traditional projection devices, or micro-projection devices in near-eye display devices, experience multiple optical path couplings during light transmission, which introduces interference light and makes it difficult to solve the problem of optical path crosstalk, thus affecting the quality of projection imaging. Utility Model Content

[0004] Therefore, it is necessary to provide a light source component and projection device to reduce the impact of interference light on the projection imaging quality and solve the problem of optical crosstalk.

[0005] A light source assembly, comprising:

[0006] Install the cup;

[0007] A light source is disposed inside the mounting cup;

[0008] A collimating lens assembly is disposed on the mounting cup and located on the light-emitting side of the light source, the collimating lens assembly covering the light-emitting range of the light source; and,

[0009] The first light-absorbing layer is disposed on the inner wall of the mounting cup.

[0010] In the aforementioned light source assembly, the collimating lens group covers the light emission range of the light source. The light emitted by the light source is collimated by the collimating lens group before exiting the light source assembly. When the light emitted by the light source is transmitted within the mounting cup, it does not need to undergo reflection and refraction by the inner wall of the mounting cup, thus reducing the introduction of interference light and solving the problem of optical crosstalk, thereby improving the projection image quality. Simultaneously, a first light-absorbing layer is provided on the inner wall of the mounting cup, which absorbs the light incident on the inner wall of the mounting cup, preventing light reflection and interference light formation, further reducing the introduction of interference light components and improving the projection image quality. Furthermore, the collimating lens group improves the collimation performance of the beam emitted by the light source assembly, enhancing beam quality, which in turn improves the projection image quality after passing through the projection lens and suppresses image distortion and aberration received by the projection lens.

[0011] In one embodiment, the light source assembly further includes a first reflective layer disposed on the outer wall of the mounting cup. The first reflective layer can reflect light rays incident on the outer wall of the mounting cup from the outside, reducing the risk of light rays from the outside of the mounting cup participating in imaging, thereby helping to reduce the introduction of interfering light components and improve the quality of projected imaging.

[0012] In one embodiment, the collimating lens group includes a first lens, a second lens, and a third lens arranged sequentially in the light emission direction of the light source. The first lens has negative optical power, the second lens has positive optical power, and the third lens has positive optical power. The first lens covers the light emission range of the light source. The combination of the three lenses (negative, positive, and positive) effectively collimates the light emitted by the light source, improving the beam quality emitted from the light source assembly, thereby enhancing the projection imaging quality. Furthermore, the appropriate arrangement of the three lenses can reduce aberrations introduced during collimation.

[0013] In one embodiment, the first lens and the second lens are located inside the mounting cup, and the third lens is disposed at one end of the mounting cup and closes the port of the mounting cup. The arrangement of the third lens closing the port of the mounting cup prevents light emitted from the light source from leaking between the third lens and the port of the mounting cup, thereby helping to suppress the generation of interfering light and improve light utilization efficiency.

[0014] In one embodiment, the light-incident and light-exit surfaces of the first lens are both concave, and the absolute values ​​of the radii of curvature of the light-incident and light-exit surfaces of the first lens are equal; the light-incident surface of the second lens is planar, and the light-exit surface is convex; the light-incident surface of the third lens is planar, and the light-exit surface is convex. This effectively collimates the light rays while simplifying the manufacturing process of the collimating lens assembly and reducing its manufacturing cost.

[0015] In one embodiment, the light source includes a plurality of light-emitting units arranged in an array. Each light-emitting unit includes a housing and a light-emitting element disposed within the housing. The light-emitting unit also includes a second light-absorbing layer disposed on the outer wall of the housing and a second reflective layer disposed on the inner wall of the housing. The second reflective layer on the inner wall of the housing helps to improve the utilization efficiency of light, while the second light-absorbing layer on the outer wall of the housing can absorb light incident from the outside of the housing onto the outer wall of the housing, preventing light from being reflected on the outer wall of the housing and forming interference light, thus helping to reduce the impact of optical crosstalk.

[0016] In one embodiment, the light-emitting unit further includes a noise-removing lens disposed on the housing and located on the light-emitting side of the light-emitting element, the noise-removing lens having positive optical power. By providing a noise-removing lens with positive optical power on the light-emitting side of the light-emitting element, the noise-removing lens can initially collimate the light emitted by the light-emitting element, eliminating nonlinear outgoing beams, thereby also helping to reduce the influence of optical crosstalk.

[0017] In one embodiment, at least one of the inner and outer walls of the mounting cup is a porous mesh structure. The porous mesh structure improves the heat dissipation efficiency of the mounting cup, enhancing its heat dissipation effect on the light source, thereby improving the performance stability and lifespan of the light source.

[0018] In one embodiment, the light source assembly further includes a cooling pipe disposed within the mounting cup. The cooling pipe can enhance the heat dissipation effect of the mounting cup on the light source through circulating liquid or through a phase change of the cooling medium, thereby improving the performance stability and lifespan of the light source.

[0019] A projection device includes a projection lens and a light source assembly as described in any of the above embodiments, wherein the projection lens is used to receive and project light emitted by the light source assembly. By employing the above-described light source assembly in the projection device, the light source assembly can suppress interfering light, reduce the influence of optical crosstalk, and also emit a beam with good collimation performance, thereby improving the quality of the projected image. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the projection device in some embodiments.

[0021] Figure 2 This is a schematic diagram of the optical path of the reflected light from the reflecting prism in some embodiments.

[0022] Figure 3 This is a cross-sectional schematic diagram of the light source assembly in some embodiments.

[0023] Figure 4 for Figure 3 The diagram shows the optical path of the light source assembly.

[0024] Figure 5 This is a cross-sectional schematic diagram of the light source structure in some embodiments.

[0025] Figure label:

[0026] 10. Projection equipment; 11. Reflecting prism; 12. Projection lens; 20. Light source assembly; 21. Mounting cup; 22. Light source; 221. Light-emitting unit; 2211. Housing; 2212. Light-emitting element; 2213. Cleaning lens; 23. Collimating lens group; 231. First lens; 232. Second lens; 233. Third lens; 24. Heat sink. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0033] Please see Figure 1 , Figure 2 and Figure 3 As shown, Figure 1 The following are schematic diagrams illustrating the structure of the projection device 10 in some embodiments of this application. Figure 2 This is a schematic diagram of the optical path of the reflected light from the reflecting prism 11 in some embodiments. Figure 3 This is a schematic diagram of the structure of the light source component 20 in some embodiments. The light source component 20 provided in this application can be used in the projection device 10 and serve as the light source part of the projection device 10. The projection device 10 can be used to project images onto surfaces such as projection screens and walls. The projection device 10 can also be the optical engine part in near-eye display devices such as AR glasses and VR glasses.

[0034] In some embodiments, the projection device 10 includes a light source assembly 20, a reflecting prism 11, and a projection lens 12. The reflecting prism 11 is disposed between the light source assembly 20 and the projection lens 12 along the optical path and is used to reflect the light emitted by the light source assembly 20 and transmit it to the projection lens 12. For example, the reflecting prism 11 can be a right-angle prism, and the inclined surface of the right-angle prism is used to reflect the light emitted by the light source assembly 20 by 90° and transmit it to the projection lens 12. The arrangement of the reflecting prism 11 to reflect light can achieve the effect of folding the optical path, thereby helping to reduce the space occupied by the projection device 10 and facilitating the miniaturization design of the projection device 10.

[0035] The projection lens 12 includes one or more lenses with optical power. The projection lens 12 is used to adjust the light transmitted by the reflecting prism 11 and project it onto the projection screen or wall. The setting of the projection lens 12 can improve the imaging quality of the projected image.

[0036] In traditional projection equipment, the light emitted by the light source is usually transmitted through reflection and refraction on the inner wall of the mounting cup to achieve convergence or collimation. During the light transmission process, because the light undergoes multiple reflections or refractions on the inner wall of the mounting cup, it is easy to introduce serious interference light, resulting in optical crosstalk and affecting the projection image quality of the projection equipment.

[0037] To address the aforementioned issues, in some embodiments provided in this application, the light source assembly 20 includes a mounting cup 21, a light-emitting source 22, a collimating lens group 23, and a first light-absorbing layer (not shown). The light-emitting source 22 is disposed within the mounting cup 21, and the collimating lens group 23 is disposed on the mounting cup 21 and located on the light-emitting side of the light-emitting source 22, covering the light-emitting range of the light-emitting source 22. The first light-absorbing layer is disposed on the inner wall of the mounting cup 21.

[0038] It should be noted that, in this application, the description of the collimating lens group 23 covering the light emission range of the light-emitting source 22 can be understood as the light-emitting cone corner of the light-emitting source 22 entering the range of the collimating lens group 23. That is, all the light emitted by the light-emitting source 22 for projection imaging will hit the collimating lens group 23, and after being adjusted by the collimating lens group 23, will exit the light source assembly 20. In other words, the inner wall of the mounting cup 21 does not participate in the adjustment and transmission of the effective imaging light emitted by the light-emitting source 22.

[0039] The aforementioned light source assembly 20 and collimating lens group 23 cover the light emission range of the light-emitting light source 22. The light emitted from the light source 22 is collimated by the collimating lens group 23 before exiting the light source assembly 20. When the light emitted from the light source 22 is transmitted within the mounting cup 21, it does not need to undergo reflection and refraction through the inner wall of the mounting cup 21, thus reducing the introduction of interference light and solving the problem of optical crosstalk, thereby improving the projection image quality. Simultaneously, a first light-absorbing layer is provided on the inner wall of the mounting cup 21, which absorbs the light incident on the inner wall of the mounting cup 21, preventing light reflection from forming interference light, further reducing the introduction of interference light components and improving the projection image quality. Furthermore, the collimating lens group 23 helps improve the collimation performance of the beam emitted by the light source assembly 20, improving beam quality, thereby improving the projection image quality after passing through the projection lens 12 and suppressing image distortion and aberration received by the projection lens 12.

[0040] In some embodiments, the light source assembly 20 further includes a first reflective layer (not shown). The first reflective layer is disposed on the outer wall of the mounting cup 21. The first reflective layer can reflect light rays that strike the outer wall of the mounting cup 21 from the outside of the mounting cup 21, reducing the risk of light rays from the outside of the mounting cup 21 entering the mounting cup 21 and participating in projection imaging. This helps to suppress the introduction of interfering light components, reduce the risk of light crosstalk, and improve the quality of projection imaging.

[0041] Combination Figure 3 and Figure 4 As shown, in some embodiments, the collimating lens group 23 includes a first lens 231, a second lens 232 and a third lens 233 arranged sequentially in the light emission direction of the light source 22. The first lens 231 covers the light emission range of the light source 22. The light emitted by the light source 22 hits the first lens 231 and is emitted from the light source assembly 20 after being adjusted by the first lens 231, the second lens 232 and the third lens 233 in sequence.

[0042] In some embodiments, the first lens 231 has negative optical power, the second lens 232 has positive optical power, and the third lens 233 has positive optical power. Figure 4 The arrows in the middle indicate the direction of the light path, from Figure 4 It can be seen that by setting up three lenses—negative, positive, and positive—in combination, the light emitted by the light source 22 can be effectively collimated, improving the beam quality emitted by the light source assembly 20. At the same time, the reasonable combination of the three lenses can also make the light transition reasonably, reducing the aberrations introduced during the collimation process, thereby helping to improve the projection imaging quality.

[0043] In some embodiments, the first lens 231 and the second lens 232 are located inside the mounting cup 21, and the third lens 233 is disposed at one end of the mounting cup 21 and closes the port of the mounting cup 21. For example, the light-incident surface of the third lens 233 abuts against the end face of the mounting cup 21 and covers the port of the mounting cup 21. The first lens 231, the second lens 232, and the third lens 233 can all be fixed to the mounting cup 21 by any applicable method such as optical adhesive. The arrangement of the third lens 233 closing the port of the mounting cup 21 can prevent the light emitted by the light source 22 from leaking between the third lens 233 and the end face of the mounting cup 21, thereby helping to suppress the generation of interference light and improve the light utilization efficiency, which in turn helps to improve the projection imaging quality.

[0044] In some embodiments, the light-incident and light-exit surfaces of the first lens 231 are both concave, and the absolute values ​​of the radii of curvature of the light-incident and light-exit surfaces of the first lens 231 are equal. The light-incident surface of the second lens 232 is planar, and the light-exit surface is convex. The light-incident surface of the third lens 233 is planar, and the light-exit surface is convex. This arrangement allows the three lenses to form a good fit, enabling the collimating lens group 23 to effectively collimate light rays. It also helps to reduce the molding difficulty of the first lens 231, the second lens 232, and the third lens 233. Furthermore, it facilitates the mounting and support of the second lens 232 within the mounting cup 21 and the support and fixation of the third lens 233 on the end face of the mounting cup 21. This simplifies the manufacturing process of the collimating lens group 23 and reduces its manufacturing cost.

[0045] It should be noted that, in this application, for the first lens 231, the second lens 232 and the third lens 233, the surface of the lens facing the light source 22 is regarded as the light-incident surface of the lens, and the surface facing away from the light source 22 is regarded as the light-exit surface of the lens.

[0046] Combination Figure 3 and Figure 5 As shown, in some embodiments, the light source 22 includes a plurality of light-emitting units 221 arranged in an array, each light-emitting unit 221 including a housing 2211 and a light-emitting element 2212 disposed within the housing 2211. The light source 22 includes, but is not limited to, any suitable light source such as an LED light source, an OLED light source, or a microLED light source, and the light-emitting element 2212 may have three different colors, with the three different colored light-emitting elements 2212 arranged in an array together. For example, in Figure 5 The three light-emitting elements 2212 shown can be red, green, and blue light-emitting structures, respectively.

[0047] In some embodiments, the light-emitting unit 221 further includes a second light-absorbing layer (not shown) disposed on the outer wall of the housing 2211, and a second reflective layer (not shown) disposed on the inner wall of the housing 2211. The second reflective layer on the inner wall of the housing 2211 can reflect the light emitted by the light-emitting element 2212 and then emit it, which is beneficial to improve the light utilization efficiency. The second light-absorbing layer on the outer wall of the housing 2211 can absorb the light that shines from the outside of the housing 2211 onto the outer wall of the housing 2211, preventing the light from being reflected on the outer wall of the housing 2211 and forming interference light, which is beneficial to reduce the influence of light crosstalk and improve the projection imaging quality.

[0048] In some embodiments, the light-emitting unit 221 further includes a noise-removing lens 2213 disposed on the housing 2211 and located on the light-emitting side of the light-emitting element 2212. The noise-removing lens 2213 has positive optical power and can be a convex lens. For example, the surface of the noise-removing lens 2213 facing the light-emitting element 2212 can be flat and fixed to the end face of the housing 2211, while the surface of the noise-removing lens 2213 facing away from the light-emitting element 2212 can be convex. By providing a noise-removing lens 2213 with positive optical power on the light-emitting side of the light-emitting element 2212, the noise-removing lens 2213 can perform preliminary collimation on the light emitted by the light-emitting element 2212, eliminating nonlinear outgoing beams and improving the beam quality emitted by the light-emitting unit 221. This also helps to reduce the influence of optical crosstalk and improve the projection imaging quality.

[0049] In some embodiments, at least one of the inner and outer walls of the mounting cup 21 is a porous mesh structure, which includes, but is not limited to, a honeycomb structure. The porous mesh structure improves the heat dissipation efficiency of the mounting cup 21 and enhances its heat dissipation effect on the light source 22, thereby improving the performance stability and lifespan of the light source 22.

[0050] It is understood that in this application, the mounting cup 21 does not participate in the adjustment and transmission of effective projected light. The mounting cup 21 is mainly used to provide structural support for the alignment lens group 23 and the light source 22, and at the same time provides heat dissipation for the light source 22. The setting of the first light-absorbing layer and the first light-reflecting layer on the mounting cup 21 is also conducive to suppressing the generation of interference light and reducing the impact of light crosstalk on the projection imaging quality.

[0051] In some embodiments, the light source assembly 20 further includes a cooling pipe disposed within the mounting cup 21. The cooling pipe can improve the heat dissipation effect of the mounting cup 21 on the light source 22 through circulating liquid or through a phase change of the cooling medium, thereby further improving the performance stability and lifespan of the light source 22. For example, the cooling pipe can be connected to an external water source and water pump, and the heat generated by the light source 22 can be removed by establishing liquid circulation within the cooling pipe, thus improving heat dissipation efficiency. The cooling pipe can also be in a closed state, containing any suitable cooling medium such as water or alcohol. The cooling medium can absorb the heat generated by the light source 22 within the cooling pipe and vaporize, then release heat and liquefy at a location away from the light source 22, thereby accelerating the heat dissipation of the light source 22 by the mounting cup 21 and improving heat dissipation efficiency.

[0052] Please see again. Figure 3In some embodiments, the light source assembly 20 further includes a heat sink 24, which is disposed at the bottom of the mounting cup 21. The light source 22 is disposed on the heat sink 24, for example, at the center of the surface of the heat sink 24 facing the collimating lens assembly 23. The material of the heat sink 24 includes, but is not limited to, metal, or a composite material composed of metal and ceramic materials, or metal and graphite materials. The heat sink 24 can improve the heat dissipation efficiency of the light source 22, which is beneficial to improving the performance stability and service life of the light source 22.

[0053] In this application, the first light-absorbing layer and the second light-absorbing layer are, but are not limited to, any suitable light-absorbing coating such as a black anodized coating, a nano-light-absorbing coating, or an electrophoretic deposition light-absorbing coating. The first reflective layer and the second reflective layer are, but are not limited to, any suitable reflective coating such as a vacuum-deposited aluminum film coating or a silver-based reflective coating, as long as they can meet the corresponding light absorption or reflection requirements.

[0054] The use of the light source component 20 described in any of the above embodiments in the projection device 10 can suppress interfering light, reduce the influence of light crosstalk, and also emit a beam with good collimation performance, which is beneficial to improving the projection imaging quality of the projection device 10.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A light source assembly, characterized in that, include: Install the cup; A light source is disposed inside the mounting cup; A collimating lens assembly is disposed on the mounting cup and located on the light-emitting side of the light source, the collimating lens assembly covering the light-emitting range of the light source; and, The first light-absorbing layer is disposed on the inner wall of the mounting cup.

2. The light source assembly of claim 1, wherein, The light source assembly further includes a first reflective layer, which is disposed on the outer wall of the mounting cup.

3. The light source assembly of claim 1, wherein, The collimating lens group includes a first lens, a second lens, and a third lens arranged sequentially in the light emission direction of the light source. The first lens has negative optical power, the second lens has positive optical power, and the third lens has positive optical power. The first lens covers the light emission range of the light source.

4. The light source assembly according to claim 3, characterized in that, The first lens and the second lens are located inside the mounting cup, and the third lens is disposed at one end of the mounting cup and closes the port of the mounting cup.

5. The light source assembly of claim 3, wherein, The first lens has concave light-incident and light-exit surfaces, and the absolute values ​​of the radii of curvature of the light-incident and light-exit surfaces of the first lens are equal; the second lens has a planar light-incident surface and a convex light-exit surface; the third lens has a planar light-incident surface and a convex light-exit surface.

6. The light source assembly of claim 1, wherein, The light source includes a plurality of light-emitting units arranged in an array. Each light-emitting unit includes a housing and a light-emitting element disposed inside the housing. The light-emitting unit also includes a second light-absorbing layer disposed on the outer wall of the housing and a second reflective layer disposed on the inner wall of the housing.

7. The light source assembly according to claim 6, characterized in that, The light-emitting unit also includes a noise-removing lens disposed on the housing and located on the light-emitting side of the light-emitting element, the noise-removing lens having positive optical power.

8. The light source assembly according to any one of claims 1-7, characterized in that, At least one of the inner and outer walls of the mounting cup is a porous mesh structure.

9. The light source assembly according to any one of claims 1-7, characterized in that, The light source assembly also includes a cooling pipe disposed within the mounting cup.

10. A projection apparatus, characterized by, It includes a projection lens and a light source assembly as described in any one of claims 1-9, wherein the projection lens is used to receive and project light emitted by the light source assembly.

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