Laser projection display device

Abstract

The embodiment of the invention provides laser projection display equipment, and belongs to the technical field of display. The laser comprises a packaging shell, a plurality of light-emitting units and a focusing lens. A second accommodating cavity is formed in the packaging shell, a light outlet is formed in the packaging shell, and a fluorescence conversion part is arranged in the light outlet; each light-emitting unit is configured to emit sub-excitation light beams, and the sub-excitation light beams emitted by the multiple light-emitting units form an excitation light beam so as to excite the fluorescence conversion part to generate white light; the focusing lens is located in the second containing cavity and located between the fluorescence conversion part and the multiple light-emitting units, the focusing lens is configured to focus the excitation light beams on the fluorescence conversion part, and the light intensity of the excitation light beams emitted from the focusing lens is distributed in a flat top mode. According to the laser projection equipment, the color temperature uniformity of white light is improved, so that the color uniformity of a projected image is improved, and the picture quality of the laser projection display equipment is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of laser display technology, and in particular to a laser projection display device. Background Art

[0002] Laser projection display device is a display device that uses laser as a light source and projects images outward. The optical engine is a key component in laser projection display devices. The optical engine usually includes an engine housing, and a laser, an illumination system, a digital micromirror device (DMD) and a projection system located in the engine housing. The laser emitted by the laser is irradiated onto the DMD through the illumination system and modulated into an image by the DMD. The modulated image is projected outward through the projection system.

[0003] In the related art, a laser generally includes a packaging shell, a focusing lens group and a plurality of light-emitting units. The packaging shell is provided with a fluorescence conversion part. The plurality of light-emitting units are located in the packaging shell and arranged in a straight line, and the light-emitting side of each light-emitting unit faces the fluorescence conversion part. The focusing lens group is located in the packaging shell and between the light-emitting unit and the fluorescence conversion part. The focusing lens group is provided with a plurality of focusing lenses, and the plurality of focusing lenses correspond to the plurality of light-emitting units one by one. The light emitted by each light-emitting unit is focused on the fluorescence conversion part after passing through the corresponding focusing lens, and the fluorescence conversion part is excited, so that the light emitted from the fluorescence conversion part is converted into white light.

[0004] However, the laser projection display device using the laser in the related art has poor color uniformity in the projected image, which reduces the picture quality of the laser projection display device. Summary of the invention

[0005] The embodiment of the present application provides a laser projection display device, which can solve the technical problems in the related art that the adjustment accuracy of the adjustment mechanism is low, which increases the difficulty of adjusting the position of the optical element, thereby increasing the difficulty of assembling the optical engine and reducing the production efficiency of the laser projection display device.

[0006] In a first aspect, an embodiment of the present application provides a laser projection display device, comprising an optical engine, wherein the optical engine is configured to project an image outward; the optical engine comprises an engine housing and a laser; the engine housing is configured with a first accommodating cavity; the laser is located in the first accommodating cavity and is configured to provide a white light source; the laser comprises a packaging shell, a plurality of light-emitting units and a focusing lens; the packaging shell is configured with a second accommodating cavity, the packaging shell is provided with a light outlet, and a fluorescence conversion part is provided in the light outlet; the plurality of light-emitting units are all located in the second accommodating cavity, each of the light-emitting units is configured to emit a sub-excitation light beam, and the sub-excitation light beams emitted by the plurality of light-emitting units form an excitation light beam to excite the fluorescence conversion part to generate white light; the focusing lens is located in the second accommodating cavity and between the fluorescence conversion part and the plurality of light-emitting units, the focusing lens is configured to focus the excitation light beam on the fluorescence conversion part, and to make the light intensity of the excitation light beam emitted from the focusing lens present a flat-top distribution.

[0007] The laser projection display device of the embodiment of the present application has a laser provided with a focusing lens, which is located between the fluorescent conversion part and the light-emitting unit. The focusing lens can focus the excitation light beam emitted by the light-emitting unit on the fluorescent conversion part, and can also make the light intensity of the excitation light beam emitted from the focusing lens present a flat-top distribution, thereby reducing the intensity difference between the middle area and the edge area of ​​the excitation light beam irradiated on the fluorescent conversion part, and improving the light intensity uniformity of the excitation light beam irradiated on the fluorescent conversion part. The excitation light beam with higher light intensity uniformity excites the fluorescent conversion part, and improves the color temperature uniformity of the white light emitted from the fluorescent conversion part, thereby improving the color uniformity of the image projected by the laser projection display device using the laser, and further improving the picture quality of the laser projection display device.

[0008] In some embodiments of the present application, the focusing lens includes a first working surface and a second working surface relative to each other, the first working surface faces the light-emitting unit, and the first working surface is a plane; the second working surface faces the fluorescence conversion part, and the second working surface is a free-form surface or an aspherical surface.

[0009] In this way, the first working surface which is a plane can be used as the installation and positioning surface of the focusing lens. Compared with other surface types such as spherical surfaces or free-form surfaces, the installation and positioning surface which is a plane can improve the position accuracy of the focusing lens, which is conducive to improving the focusing effect of the excitation beam.

[0010] In addition, when the light-emitting chip of the light-emitting unit is a semiconductor laser diode, the divergence angles of the fast axis and slow axis of the excitation light beams emitted by multiple light-emitting units are different. For example, the divergence angle in the fast axis direction is generally between 40° and 60°, the light field distribution in the fast axis direction is a fundamental mode Gaussian distribution, and the beam quality is close to the diffraction limit. The divergence angle in the slow axis direction is generally between 6° and 15°, the active area in the slow axis direction is wider, the light wave mode is more complex, and a multi-transverse mode structure will be generated. The light field distribution is generally close to a flat-top distribution, and the beam quality is poor. If a focusing lens with a spherical working surface is used to focus the excitation light beam, non-overlapping fast-axis focus and slow-axis focus will be generated on the fluorescence conversion part, reducing the excitation efficiency of the fluorescence conversion part. In an embodiment of the present application, the second working surface is set as a free-form surface or an aspherical surface, and the second working surface can be optimized in the fast axis direction and the slow axis direction respectively, so that the fast axis focus and the slow axis focus of the excitation light beam on the fluorescence conversion part coincide with each other, and the excitation light beams emitted by multiple light-emitting units are all focused on the fluorescence conversion part, thereby improving the focusing effect of the excitation light beam.

[0011] In some embodiments of the present application, the surface shape of the free-form surface conforms to the following formula:

[0012]

[0013] Wherein, C is greater than or equal to -0.9 and less than or equal to -0.7; k is greater than or equal to 0.26 and less than or equal to 1.28; a2 is greater than or equal to -1.20 and less than or equal to -0.87; a4 is greater than or equal to 0.05 and less than or equal to 0.14; a6 is greater than or equal to 0.26 and less than or equal to 0.67; a8 is greater than or equal to 0.05 and less than or equal to 3.28; a 10 Greater than or equal to -0.7 and less than or equal to 18.62.

[0014] Such an arrangement allows the focusing lens to overlap the fast-axis focus and the slow-axis focus formed by the sub-excitation beam on the fluorescence conversion part, and enables the sub-excitation beams emitted by multiple light-emitting units to be focused on the fluorescence conversion part, thereby improving the focusing effect of the excitation beam.

[0015] In some embodiments of the present application, the laser also includes a lens fixing member for fixing the focusing lens; one of the lens fixing member and the packaging shell is provided with a sliding recessed portion, the sliding recessed portion extends in a direction from the light-emitting unit to the fluorescence conversion portion, and the other is provided with a sliding protrusion, the sliding protrusion is slidably arranged in the sliding recessed portion.

[0016] Such an arrangement allows the lens fixing member to slide relative to the packaging shell, thereby adjusting the position of the focusing lens, thereby improving the convenience of installing and adjusting the focusing lens.

[0017] In some embodiments of the present application, the packaging shell includes an annular side wall and a bottom plate connected to one end of the annular side wall; the bottom plate is provided with a plurality of mounting parts on one side of the second accommodating cavity, and a mounting surface is provided on the side of the mounting part facing away from the bottom plate; along the direction of the fluorescent conversion part pointing to the focusing lens, the plurality of mounting parts are arranged in sequence, and the distance between the mounting surfaces of the plurality of mounting parts and the bottom plate increases in sequence; the plurality of light-emitting units are respectively arranged on the mounting surfaces of the plurality of mounting parts, so that the sub-excitation light beams emitted by each of the light-emitting units are arranged in a multi-dimensional array.

[0018] Such an arrangement can make the excitation light beam incident on the focusing lens more concentrated. Compared with the technical solution in which multiple light-emitting units are arranged in a straight line in the related art, the excitation light beam in the embodiment of the present application has a higher symmetry, which can reduce the design difficulty of the focusing lens, so that the focusing effect of the excitation light beam is better, and the light intensity difference between the middle area and the edge area of ​​the excitation light beam emitted from the focusing lens can be further reduced, thereby further improving the color temperature uniformity of the white light emitted from the fluorescent conversion unit.

[0019] In some embodiments of the present application, the plurality of mounting portions include a first mounting portion and a second mounting portion, the second mounting portion is closer to the fluorescent conversion portion than the first mounting portion, and the distance between the mounting surface of the second mounting portion and the base plate is smaller than the distance between the mounting surface of the first mounting portion and the base plate; the number of the light-emitting units is four, two of which are arranged on the first mounting portion, and two of which are arranged on the second mounting portion.

[0020] In this way, the four light-emitting units can make the white light emitted by the laser have greater brightness and make the cost of the laser lower. By providing the first mounting portion and the second mounting portion, the four light-emitting units can be arranged three-dimensionally in the second accommodating cavity, reducing the space occupied by the four light-emitting units, which is conducive to the miniaturization of high-power lasers.

[0021] In some embodiments of the present application, the four light-emitting units are symmetrically arranged relative to the center line of the focusing lens; the light-emitting sides of the two light-emitting units located on the first mounting part face the fluorescent conversion part; the light-emitting sides of the two light-emitting units located on the second mounting part are arranged opposite to each other, and two reflective elements are arranged between the two light-emitting units located on the second mounting part, and the two reflective elements are symmetrically arranged relative to the center line of the focusing lens; the sub-excitation light beams emitted by the two light-emitting units located on the second mounting part are respectively reflected by the two reflective elements and then incident on the focusing lens.

[0022] In this way, by providing a reflective element, the optical path of the two light-emitting units located on the second mounting portion can be extended to reduce or eliminate the optical path difference between the two light-emitting units located on the first mounting portion. Since the two light-emitting units located on the second mounting portion and the two light-emitting units located on the first mounting portion are focused on the fluorescence conversion portion through the same focusing lens, the focusing lens needs to be designed for the four light-emitting units, and the optical path difference between the four light-emitting units is reduced or eliminated, which can reduce the design difficulty of the focusing lens and is conducive to improving the focusing effect of the excitation light beam.

[0023] In some embodiments of the present application, the material of the annular sidewall is ceramic.

[0024] Such a configuration enables the annular sidewall to have excellent thermal conductivity, high temperature stability and good electrical performance, and can have both mechanical support and electrical interconnection functions. A circuit for electrical connection can also be formed on the annular sidewall, which is conducive to further miniaturization of high-power lasers.

[0025] In some embodiments of the present application, the annular side wall surrounds the base plate, and a conductive layer is provided on one side of the annular side wall located in the second accommodating cavity, and the conductive layer is electrically connected to the light-emitting unit; a via is provided in the annular side wall, and the via is electrically connected to the conductive layer, and an electrical connection end is formed at one end of the annular side wall close to the base plate.

[0026] With such arrangement, the conductive layer and the via hole can form a connection circuit for electrical connection to electrically connect the light-emitting unit and the external circuit without the need for additional connection circuits, which is conducive to further miniaturization of high-power lasers.

[0027] In a second aspect, an embodiment of the present application provides a laser projection display device, comprising an optical engine, wherein the optical engine is configured to project an image outward, and the optical engine comprises an engine housing and a laser; the engine housing is configured with a first accommodating cavity; the laser is located in the first accommodating cavity and is configured to provide a white light source; the laser comprises a packaging shell, a plurality of light-emitting units and a focusing lens; the packaging shell is configured with a second accommodating cavity, the packaging shell is provided with a light outlet, and a fluorescence conversion part is provided in the light outlet; the plurality of light-emitting units are all located in the second accommodating cavity and are configured to emit an excitation light beam; the focusing lens is located in the second accommodating cavity and between the fluorescence conversion part and the plurality of light-emitting units, the focusing lens is configured to focus the excitation light beam on the fluorescence conversion part, and to make the difference between the light intensity of the middle area and the light intensity of the edge area of ​​the excitation light beam emitted from the focusing lens within a preset range.

[0028] In the laser projection display device of the embodiment of the present application, the laser is provided with a focusing lens, which can focus the excitation light beams emitted by multiple light-emitting units on the fluorescent conversion part, and make the difference between the light intensity of the middle area and the light intensity of the edge area of ​​the excitation light beam emitted from the focusing lens within a preset range, so that the light intensity of the excitation light beam is flat-top distribution, so as to reduce the light intensity difference between the middle area and the edge area of ​​the excitation light beam irradiated on the fluorescent conversion part, and improve the light intensity uniformity of the excitation light beam irradiated on the fluorescent conversion part. The excitation light beam with higher light intensity uniformity excites the fluorescent conversion part, which can improve the color temperature uniformity of the white light emitted from the fluorescent conversion part, thereby improving the color uniformity of the image projected by the laser projection display device using the laser, and further improving the picture quality of the laser projection display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0030] Figure 1 A schematic diagram of the structure of a laser projection display device according to an embodiment of the present application;

[0031] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the laser;

[0032] Figure 3 for Figure 2 Schematic diagram of the three-dimensional structure when the laser is hidden in the cover;

[0033] Figure 4 for Figure 3 Schematic diagram of the top view structure of the laser;

[0034] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the AA direction;

[0035] Figure 6 for Figure 3 Schematic diagram of the connection between the light-emitting unit and the conductive layer in the laser;

[0036] Figure 7 for Figure 3 Schematic diagram of the structure of the laser from above;

[0037] Figure 8 for Figure 3 Light intensity distribution diagram of the sub-excitation beams of the four light-emitting units;

[0038] Fig. 9 for Figure 3 Schematic diagram of the structure and optical path of the focusing lens;

[0039] Fig.10 is the light intensity distribution diagram of the excitation light beam emitted from the focusing lens;

[0040] Fig.11 for Figure 3 A schematic diagram of the structure of the middle lens fixing member;

[0041] Fig.12 is a schematic diagram of the connection structure between the lens fixing member and the focusing lens;

[0042] Fig.13 is a light intensity distribution diagram of a light beam before it is incident on a focusing lens group in the related art;

[0043] Fig.14 This is a diagram of the light intensity distribution of a light beam emitted from a focusing lens group in the related art.

[0044] Description of reference numerals:

[0045] 100-engine housing;

[0046] 110- first accommodating chamber;

[0047] 200-Laser;

[0048] 210-encapsulation shell; 211-second accommodating cavity;

[0049] 212- annular side wall; 2121- light outlet;

[0050] 2122-first conductive layer; 2123-second conductive layer;

[0051] 2124- third conductive layer; 2125- fourth conductive layer;

[0052] 2126-insulating layer; 2127-electrical connection end;

[0053] 213-bottom plate; 2131-first mounting portion;

[0054] 2132-second mounting portion; 2133-sliding recessed portion;

[0055] 2134- adapter; 2135- fixed connection end;

[0056] 214-cover plate; 215-fluorescence conversion unit;

[0057] 2151-light-transmitting carrier; 2152-phosphor layer;

[0058] 220-light emitting unit; 221-heat sink substrate;

[0059] 222-light emitting chip; 223-voltage stabilizing diode;

[0060] 230-focusing lens; 231-first working surface;

[0061] 232-a second working surface; 233-a lens fixing member;

[0062] 234-mounting through hole; 235-lens limiting portion;

[0063] 236-fixing ring; 237-adjusting ring;

[0064] 240-reflective element;

[0065] 300- Lighting system;

[0066] 400-DMD;

[0067] 500-Projection system. DETAILED DESCRIPTION

[0068] The laser projection display device in the related art has a technical problem that the color uniformity of the image projected is poor, which reduces the picture quality of the laser projection display device. The inventors have found that the reason is that the multiple light-emitting units are usually arranged in a straight line, and the light intensity distribution of the light beams emitted by the multiple light-emitting units before and after passing through the focusing lens group is as follows: Fig.13 and Fig.14 As shown. Fig.14 It can be seen that the light intensity distribution of the light beam after passing through the focusing lens group is a Gaussian distribution. That is to say, for the light beam after passing through the focusing lens group, its light intensity gradually decreases from the central axis of the light beam to 0 outward, showing a trend of bright middle area and dark edge area, and low light intensity uniformity. The light beam with Gaussian distribution is focused on the fluorescent conversion part and excites the fluorescent conversion part, which will make the color temperature distribution of the white light emitted from the fluorescent conversion part show a trend of high in the middle area and low in the edge area, reducing the color temperature uniformity of the white light, resulting in poor color uniformity of the image projected by the laser projection display device using the laser, and reducing the picture quality of the laser projection display device.

[0069] In view of this, in the laser projection display device of the embodiment of the present application, the laser is provided with a focusing lens, which can focus the excitation light beams emitted by multiple light-emitting units on the fluorescent conversion part, and make the light intensity of the excitation light beam emitted from the focusing lens present a flat-top distribution, so as to reduce the light intensity difference between the middle area and the edge area of ​​the excitation light beam irradiated on the fluorescent conversion part, and improve the light intensity uniformity of the excitation light beam irradiated on the fluorescent conversion part. The excitation light beam with higher light intensity uniformity excites the fluorescent conversion part, which can improve the color temperature uniformity of the white light emitted from the fluorescent conversion part, thereby improving the color uniformity of the image projected by the laser projection display device using the laser, and further improving the picture quality of the laser projection display device.

[0070] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0071] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their common and usual meanings.

[0072] In addition, the terms "including" and "having" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components explicitly listed but may include other components not explicitly listed or inherent to such products or devices.

[0073] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0074] The terms "first", "second", "third", "fourth", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", "third", "fourth", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "multiple" means two or more.

[0075] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0076] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0077] The present application provides a laser projection display device, the laser projection display device includes an optical engine, and the optical engine is configured to project an image outward. Figure 1 , the optical engine may include an engine housing 100, a laser 200, an illumination system 300, a digital micromirror device (DMD) and a projection system 500. The engine housing 100 is configured with a first accommodating cavity 110, and the laser 200, the illumination system 300, the DMD 400 and the projection system 500 are all located in the first accommodating cavity 110. The laser emitted by the laser 200 is irradiated onto the DMD 400 through the illumination system 300, and is modulated into an image by the DMD 400, and the modulated image is projected outward through the projection system 500 for viewing by the user.

[0078] The laser 200 is located in the first housing cavity 110 and is configured to provide a white light source. Figure 2 , Figure 3 , Figure 4 and Figure 5The laser 200 may include a packaging shell 210, a plurality of light-emitting units 220, and a focusing lens 230. The packaging shell 210 is configured with a second accommodating cavity 211, and the annular side wall 212 of the packaging shell 210 is provided with a light outlet 2121, and a fluorescence conversion part 215 is provided in the light outlet 2121. The plurality of light-emitting units 220 are all located in the second accommodating cavity 211, and each of the light-emitting units 220 is configured to emit a sub-excitation beam, and the sub-excitation beams emitted by the plurality of light-emitting units 220 form an excitation beam to excite the fluorescence conversion part 215 to generate white light. The focusing lens 230 is located in the second accommodating cavity 211, and is located between the fluorescence conversion part 215 and the plurality of light-emitting units 220. The focusing lens 230 is configured to focus the excitation beam on the fluorescence conversion part 215, and to make the light intensity of the excitation beam emitted from the focusing lens 230 present a flat-top distribution.

[0079] It should be noted that the flat-top distribution of the light intensity of the excitation beam means that the top of the light intensity distribution curve of the excitation beam shows a tendency to extend in the horizontal direction, that is, the light intensity of the excitation beam is almost constant from the central axis of the beam outward, and rapidly drops to 0 at the edge of the excitation beam, that is, the light intensity in the middle area and the edge area tends to be equal or approximately equal, for example Fig.10 As shown. Exemplarily, for an excitation light beam with a flat-top distribution, the difference between the light intensity in the middle area and the light intensity in the edge area may be within a preset range. For example, the middle area may be an area with a light intensity greater than 13.5% of the peak intensity. The edge area may be an area with a light intensity less than 13.5% of the peak intensity. The preset range may be specifically set according to the requirements for the color uniformity of the image projected by the laser projection display. Exemplarily, the peak intensity may be normalized to 1, and the light intensity in the middle area may be between 0.8 and 1. Compared with a Gaussian distribution, a light beam with a flat-top distribution has a high light intensity uniformity.

[0080] In the laser projection display device of the embodiment of the present application, the laser 200 is provided with a focusing lens 230, and the focusing lens 230 is located between the fluorescence conversion part 215 and the light emitting unit 220. The focusing lens 230 can focus the excitation light beam emitted by the light emitting unit 220 on the fluorescence conversion part 215, and can also make the light intensity of the excitation light beam emitted from the focusing lens 230 present a flat-top distribution, thereby reducing the intensity difference between the middle area and the edge area of ​​the excitation light beam irradiated on the fluorescence conversion part 215, and improving the light intensity uniformity of the excitation light beam irradiated on the fluorescence conversion part 215. The excitation light beam with higher light intensity uniformity excites the fluorescence conversion part 215, improves the color temperature uniformity of the white light emitted from the fluorescence conversion part 215, thereby improving the color uniformity of the image projected by the laser projection display device using the laser 200, and further improving the picture quality of the laser projection display device.

[0081] The packaging shell 210 is configured with a second accommodating cavity 211 for accommodating components such as the light emitting unit 220 and the focusing lens 230 to achieve packaging of the laser 200, thereby preventing foreign impurities from entering the interior of the laser 200 and affecting the function of the laser 200, thereby improving the functional reliability of the laser 200. Figure 2 , Figure 3 , Figure 4 and Figure 5 The packaging shell 210 may include an annular side wall 212, a bottom plate 213 and a cover plate 214. The annular side wall 212 may be a square annular structure or a circular annular structure, or may be other annular structures. The bottom plate 213 is connected to one end of the annular side wall 212 to enclose a second accommodating cavity 211 with an opening with the annular side wall 212. Exemplarily, the material of the bottom plate 213 may be oxygen-free copper. The cover plate 214 is covered on the opening to close the second accommodating cavity 211, thereby realizing the packaging of the laser 200. Exemplarily, the material of the cover plate 214 may be ceramic or oxygen-free copper.

[0082] The annular side wall 212 may be provided with a light outlet 2121, and a fluorescence conversion part 215 is provided in the light outlet 2121. Exemplarily, the fluorescence conversion part 215 may include a light-transmitting carrier 2151 and a phosphor layer 2152. The light-transmitting carrier 2151 may be installed in the light outlet 2121 by gluing or the like. The material of the light-transmitting carrier 2151 may be sapphire or quartz glass, etc. The phosphor layer 2152 is provided on the light-transmitting carrier 2151. Exemplarily, silica gel mixed with phosphors may be applied to the light-transmitting carrier 2151, and the silica gel may be cured to form the phosphor layer 2152. The type of phosphor may be silicate phosphor, nitride phosphor or aluminate phosphor, etc., wherein the chemical properties of aluminate phosphor are more stable. The color of the phosphor may be specifically set according to the wavelength of the excitation light beam emitted by the light-emitting unit 220. For example, when the excitation light beam emitted by the light-emitting unit 220 is blue light, the phosphor may be yellow phosphor. When the excitation light beam emitted by the light emitting unit 220 is near ultraviolet light, the phosphor can be a mixed red, green and blue phosphor. It is understandable that the excitation light beam emitted by the light emitting unit 220 can also be light of other wavelengths, and the phosphor can also be phosphor of other colors, which will not be described in detail in the embodiments of the present application.

[0083] For example, the excitation light beam emitted by the light-emitting unit 220 is blue light, and the phosphor is yellow phosphor, and the excitation process of the phosphor conversion unit 215 is described. When the blue light emitted by the light-emitting unit 220 is incident on the phosphor conversion unit 215, a part of the blue light does not contact the yellow phosphor, and penetrates through the gaps between the particles of the yellow phosphor; the other part of the blue light contacts the yellow phosphor, excites the yellow phosphor and generates yellow light, and the yellow light and the penetrating blue light are mixed to form white light.

[0084] The light emitting unit 220 is used to emit an excitation light beam. Figure 3 The light-emitting unit 220 may include a heat sink substrate 221 and a light-emitting chip 222 disposed on the heat sink substrate 221. The heat sink substrate 221 is connected to the bottom plate 213, and a light-emitting circuit electrically connected to the light-emitting chip 222 may be formed therein. The heat sink substrate 221 may also dissipate heat for the light-emitting chip 222 to improve the reliability of the light-emitting unit 220. Exemplarily, the light-emitting chip 222 may be a semiconductor laser diode. The light-emitting unit 220 may also include a voltage regulator diode 223, which is disposed on the heat sink substrate 221 and electrically connected to the light-emitting circuit, so that the light-emitting circuit can provide a stable voltage for the light-emitting chip 222 to prevent the light-emitting chip 222 from being damaged due to abnormal voltage fluctuations.

[0085] There can be multiple light-emitting units 220, and the multiple light-emitting units 220 are all located in the second accommodating cavity 211 and are arranged on one side of the bottom plate 213 located in the second accommodating cavity 211. The multiple light-emitting units 220 can jointly emit an excitation light beam to excite the fluorescence conversion part 215, thereby increasing the optical power of the excitation light beam, thereby increasing the brightness of the white light emitted by the laser 200.

[0086] For example, reference Figure 3 and Figure 4 , a plurality of mounting parts may be provided on one side of the bottom plate 213 located at the second accommodating cavity 211, and a mounting surface is provided on the side of the mounting part facing away from the bottom plate 213. Along the direction from the fluorescence conversion part 215 to the focusing lens 230, a plurality of mounting parts are provided in sequence, and the distance between the mounting surfaces of the plurality of mounting parts and the bottom plate 213 increases in sequence. In other words, the mounting surfaces of the plurality of mounting parts are provided in a stepped manner on the bottom plate 213. The closer the mounting part is to the fluorescence conversion part 215, the smaller the height of its mounting surface. A plurality of light-emitting units 220 may be provided on the mounting surfaces of the plurality of mounting parts, respectively. The light-emitting side of the light-emitting unit 220 provided on the mounting part having a larger height mounting surface is higher than the light-emitting side of the light-emitting unit 220 provided on the mounting part having a smaller height mounting surface, so that the sub-excitation light beams emitted by the plurality of light-emitting units 220 will not be blocked, thereby enabling the plurality of light-emitting units 220 to be arranged three-dimensionally in the second accommodating cavity 211. Compared with the related art in which multiple light-emitting units 220 can only be arranged in a straight line in the extension direction of the base plate 213, the multiple light-emitting units 220 arranged in three dimensions can make full use of the space of the second accommodating cavity 211. On the premise of having the same number of light-emitting units 220, the space size occupied by the multiple light-emitting units 220 is reduced, which is conducive to the miniaturization of the high-power laser 200.

[0087] For example, since the space occupied by the three-dimensionally arranged multiple light-emitting units 220 is small, the material of the annular side wall 212 can be selected as ceramic. When the laser 200 is packaged, that is, in the process of making the packaging shell 210, the annular side wall 212 can be formed by first making a green body, and then stacking and sintering the green bodies layer by layer. During the sintering process, ceramic cracks are not easy to occur, thereby improving the yield of the laser 200. For example, the green body can be made of alumina powder by high-temperature drying and hardening at 1300-1600°C.

[0088] In addition, the material of the annular side wall 212 is ceramic, so that the annular side wall 212 can have excellent thermal conductivity, high temperature stability and good electrical performance, and can have the functions of mechanical support and electrical interconnection. A circuit for electrical connection can also be formed on the annular side wall 212, which is conducive to the further miniaturization of the high-power laser 200. Exemplarily, the annular side wall 212 can surround the bottom plate 213, and the annular side wall 212 can be connected to the bottom plate 213 by sintering. A conductive layer can be provided on one side of the annular side wall 212 located in the second accommodating cavity 211, and the conductive layer is electrically connected to the light-emitting unit 220. A via (not shown in the drawings) can be provided in the annular side wall 212, and the via is electrically connected to the conductive layer, and an electrical connection end 2127 is formed at one end of the annular side wall 212 close to the bottom plate 213. The conductive layer and the via hole can form a connection circuit for electrical connection to electrically connect the light emitting unit 220 and an external circuit without the need for additional connection circuits, which is beneficial to further miniaturization of the high-power laser 200 .

[0089] Exemplarily, the sub-excitation light beams emitted by the multiple light-emitting units 220 provided on the multiple mounting parts and incident on the focusing lens 230 can be arranged in a multi-dimensional array. It should be noted that the sub-excitation light beams emitted by the multiple light-emitting units 220 are arranged in a multi-dimensional array, which means that the sub-excitation light beams emitted by the multiple light-emitting units 220 can be arranged in an array with a row number and a column number greater than or equal to 2. In other words, at least two light-emitting units 220 are provided on each mounting part, and at least two light-emitting units 220 on each mounting part are arranged in a straight line, and the corresponding light-emitting units 220 on adjacent mounting parts are also arranged in a straight line. With such a configuration, the excitation light beam incident on the focusing lens 230 can be more concentrated. Compared with the technical solution in which multiple light-emitting units 220 are arranged in a straight line in the related art, the excitation light beam in the embodiment of the present application has a higher symmetry, which can reduce the design difficulty of the focusing lens 230, so that the focusing effect of the excitation light beam is better, and can further reduce the light intensity difference between the middle area and the edge area of ​​the excitation light beam emitted from the focusing lens 230, thereby further improving the color temperature uniformity of the white light emitted from the fluorescent conversion part 215.

[0090] The following takes the case where the number of mounting portions is two and the number of light emitting units 220 is four as an example to describe the arrangement of the light emitting units 220 and the circuit for electrical connection formed on the annular side wall 212. The arrangement and connection circuit when the number of mounting portions and light emitting units 220 is other can refer to the following description, and the embodiments of the present application will not be repeated here.

[0091] refer to Figure 3 , Figure 4 and Figure 5 , the plurality of mounting portions may include a first mounting portion 2131 and a second mounting portion 2132, the second mounting portion 2132 being closer to the fluorescence conversion portion 215 than the first mounting portion 2131, and the distance between the mounting surface of the second mounting portion 2132 and the bottom plate 213 being smaller than the distance between the mounting surface of the first mounting portion 2131 and the bottom plate 213. Exemplarily, the height difference between the mounting surface of the second mounting portion 2132 and the mounting surface of the first mounting portion 2131 may be 0.7 mm. The number of the light emitting units 220 may be four, wherein two light emitting units 220 are disposed on the first mounting portion 2131, and two light emitting units 220 are disposed on the second mounting portion 2132. The four light emitting units 220 enable the white light emitted by the laser 200 to have a greater brightness and make the cost of the laser 200 lower. By providing the first mounting portion 2131 and the second mounting portion 2132 , the four light emitting units 220 can be arranged three-dimensionally in the second accommodating cavity 211 , thereby reducing the space occupied by the four light emitting units 220 and facilitating the miniaturization of the high-power laser 200 .

[0092] refer to Figure 6 and Figure 7 , the number of conductive layers disposed inside the annular sidewall 212 may be four, and the four conductive layers are respectively a first conductive layer 2122, a second conductive layer 2123, a third conductive layer 2124, and a fourth conductive layer 2125. The first conductive layer 2122, the second conductive layer 2123, the third conductive layer 2124, and the fourth conductive layer 2125 may be sequentially spaced along the circumferential direction of the annular sidewall 212. An insulating layer 2126 may be disposed between the first conductive layer 2122 and the second conductive layer 2123, between the second conductive layer 2123 and the third conductive layer 2124, and between the third conductive layer 2124 and the fourth conductive layer 2125.

[0093] The heat sink substrate 221 in the light-emitting unit 220 may be provided with a positive electrode, and the light-emitting chip 222 may be provided with a negative electrode. The negative electrode of one of the light-emitting units 220 located on the second mounting portion 2132 may be electrically connected to the first conductive layer 2122 through a metal wire, and the positive electrode thereof may be electrically connected to the second conductive layer 2123 through a metal wire. Exemplarily, the metal wire may be a gold wire, and the diameter of the gold wire may be 20 μm to 50 μm. The second conductive layer 2123 may be electrically connected to the negative electrode of one of the light-emitting units 220 located on the first mounting portion 2131 through a metal wire, and the positive electrode of the light-emitting power source may be electrically connected to the negative electrode of another light-emitting unit 220 located on the first mounting portion 2131 through a metal wire. The positive electrode of another light-emitting unit 220 located on the first mounting portion 2131 may be electrically connected to the third conductive layer 2124 through a metal wire. The third conductive layer 2124 can be electrically connected to the negative electrode of another light emitting unit 220 located on the second mounting portion 2132 through a metal wire, and the positive electrode of the light emitting unit 220 can be electrically connected to the fourth conductive layer 2125 through a metal wire. In this way, the fourth light emitting unit 220 can be connected in series through the first conductive layer 2122, the second conductive layer 2123, the third conductive layer 2124 and the fourth conductive layer 2125.

[0094] Exemplarily, the first mounting portion 2131 may also be provided with a transfer platform 2134, and the second conductive layer 2123 and the third conductive layer 2124 may be electrically connected to the light-emitting unit 220 through the transfer platform 2134 and the metal wire electrically connected to the transfer platform 2134. In this way, the connection area for connecting with the metal wire can be increased, and the process difficulty of connecting the metal wire is reduced, thereby improving the production efficiency of the laser 200. Four vias are respectively provided in the annular side wall 212. The four vias are respectively connected to the first conductive layer 2122, the second conductive layer 2123, the third conductive layer 2124 and the fourth conductive layer 2125, and four electrical connection terminals 2127 for electrical connection with an external circuit are formed at one end of the annular side wall 212 close to the bottom plate 213. A fixed connection terminal 2135 for fixing the laser 200 is formed on the side of the bottom plate 213 facing away from the second accommodating cavity 211.

[0095] The sub-excitation light beams emitted by the four light-emitting units 220 located on the first mounting portion 2131 and the second mounting portion 2132 and incident on the focusing lens 230 may be arranged in a 2×2 array, for example Figure 8 The sub-excitation beams arranged in a 2×2 array can improve the symmetry of the excitation beam, reduce the design difficulty of the focusing lens 230, make the focusing effect of the excitation beam better, and can further reduce the light intensity difference between the middle area and the edge area of ​​the excitation beam emitted from the focusing lens 230, thereby further improving the color temperature uniformity of the white light emitted from the fluorescent conversion unit 215.

[0096] For example, reference Figure 4 and Figure 5 , the four light-emitting units 220 can be symmetrically arranged relative to the center line of the focusing lens 230. The light-emitting sides of the two light-emitting units 220 located on the first mounting portion 2131 can face the fluorescence conversion portion 215, so that the sub-excitation beams emitted by the two light-emitting units 220 can be incident on the fluorescence conversion portion 215. The sub-excitation beams emitted by the two light-emitting units 220 located on the first mounting portion 2131 can be arranged in parallel, and the distance between the sub-excitation beams emitted by the two light-emitting units 220 can be 1.2 mm. The light-emitting sides of the two light-emitting units 220 located on the second mounting portion 2132 can be arranged opposite to each other, and two reflective elements 240 can be arranged between the two light-emitting units 220 located on the second mounting portion 2132. For example, the reflective element 240 can be a reflective prism, or a plane reflective mirror, etc. The reflective element 240 can be bonded to the mounting surface of the second reflective portion. The two reflective elements 240 can be symmetrically arranged relative to the center line of the focusing lens 230. The sub-excitation beams emitted by the two light-emitting units 220 on the second mounting portion 2132 are respectively reflected by the two reflective elements 240 and then incident on the focusing lens 230. For example, the reflective element 240 can deflect the sub-excitation beams emitted by the light-emitting unit 220 by 90°. The distance between the two sub-excitation beams reflected by the reflective element 240 can be 1.2 mm.

[0097] By providing the reflective element 240, the optical path of the two light emitting units 220 located on the second mounting portion 2132 can be extended to reduce or eliminate the optical path difference between the two light emitting units 220 located on the first mounting portion 2131. Since the two light emitting units 220 located on the second mounting portion 2132 and the two light emitting units 220 located on the first mounting portion 2131 are focused on the fluorescence conversion portion 215 through the same focusing lens 230, the focusing lens 230 needs to be designed for the four light emitting units 220, and the optical path difference between the four light emitting units 220 is reduced or eliminated, which can reduce the design difficulty of the focusing lens 230 and is conducive to improving the focusing effect of the excitation light beam.

[0098] The focusing lens 230 is located between the light emitting unit 220 and the fluorescence conversion unit 215, and is used to focus the excitation light beam on the fluorescence conversion unit 215, and make the light intensity of the excitation light beam emitted from the focusing lens 230 present a flat top distribution. Fig. 9The focusing lens 230 may include a first working surface 231 and a second working surface 232 relative to each other. The first working surface 231 faces the light-emitting unit 220, and the first working surface 231 is a plane. The second working surface 232 faces the fluorescence conversion part 215, and the second working surface 232 is a free-form surface or an aspherical surface. The first working surface 231 which is a plane can be used as an installation and positioning surface of the focusing lens 230. Compared with other surface types such as a spherical surface or a free-form surface, the installation and positioning surface is a plane, which can improve the position accuracy of the focusing lens 230, which is beneficial to improving the focusing effect of the excitation light beam.

[0099] In addition, when the light-emitting chip 222 of the light-emitting unit 220 is a semiconductor laser diode, the divergence angles of the fast axis and the slow axis of the excitation light beams emitted by the multiple light-emitting units 220 are different. For example, the divergence angle in the fast axis direction is generally between 40° and 60°, the light field distribution in the fast axis direction is a fundamental mode Gaussian distribution, and the beam quality is close to the diffraction limit. The divergence angle in the slow axis direction is generally between 6° and 15°, the active area in the slow axis direction is wider, the light wave mode is more complex, and a multi-transverse mode structure will be generated. The light field distribution is generally close to a flat-top distribution, and the beam quality is poor. If a focusing lens 230 with a spherical working surface is used to focus the excitation light beam, non-overlapping fast axis focus and slow axis focus will be generated on the fluorescence conversion unit 215, reducing the excitation efficiency of the fluorescence conversion unit 215. In the embodiment of the present application, the second working surface 232 is set as a free-form surface or a aspherical surface, and the second working surface 232 can be optimized in the fast axis direction and the slow axis direction respectively, so that the fast axis focus and the slow axis focus of the excitation light beam on the fluorescence conversion part 215 coincide with each other, and the excitation light beams emitted by the multiple light-emitting units 220 are all focused on the fluorescence conversion part 215, thereby improving the focusing effect of the excitation light beam.

[0100] For example, the free-form surface may conform to the following formula:

[0101]

[0102] Wherein, C may be greater than or equal to -0.9 and less than or equal to -0.7. k may be greater than or equal to 0.26 and less than or equal to 1.28. a2 may be greater than or equal to -1.20 and less than or equal to -0.87. a4 may be greater than or equal to 0.05 and less than or equal to 0.14. a6 may be greater than or equal to 0.26 and less than or equal to 0.67. a8 may be greater than or equal to 0.05 and less than or equal to 3.28. a 10It can be greater than or equal to -0.7 and less than or equal to 18.62. In this way, the focusing lens 230 can make the fast axis focus and the slow axis focus formed by the sub-excitation light beam on the fluorescence conversion part 215 overlap, and make the sub-excitation light beams emitted by the multiple light-emitting units 220 all focus on the fluorescence conversion part 215, thereby improving the focusing effect of the excitation light beam.

[0103] For example, the focal length of the focusing lens 230 may be 0.77 mm. The thickness d of the focusing lens 230 may be 0.7 mm. The diameter D of the focusing lens 230 covers the excitation beam, for example, the diameter D of the focusing lens 230 may be 2 mm. The excitation beam before and after the focusing lens 230 may be as follows: Fig. 9 The intensity distribution of the excitation light beam emitted from the focusing lens 230 is shown in Fig.10 As shown. Fig.10 It can be seen that the intensity of the excitation light beam emitted from the focusing lens 230 is flat-topped, which can reduce the intensity difference between the middle area and the edge area of ​​the excitation light beam irradiated on the fluorescence conversion part 215, and improve the uniformity of the light intensity of the excitation light beam irradiated on the fluorescence conversion part 215. The excitation light beam with high light intensity uniformity excites the fluorescence conversion part 215, improves the color temperature uniformity of the white light emitted from the fluorescence conversion part 215, thereby improving the color uniformity of the image projected by the laser projection display device using the laser 200, and further improving the picture quality of the laser projection display device.

[0104] The focusing lens 230 may be mounted on the bottom plate 213 via a lens fixing member 233. Figure 5 , Fig.11 and Fig.12 The lens fixing member 233 may be a block structure, and the block structure may be provided with a mounting through hole 234 for accommodating the focusing lens 230. The aperture of the mounting through hole 234 may be 2 mm. The inner wall of the mounting through hole 234 is provided with an annular lens stopper 235, and the lens stopper 235 is used to stop the focusing lens 230 to prevent the focusing lens 230 from falling out of the mounting through hole 234. The aperture of the lens stopper 235 may be 1.8 mm.

[0105] In some possible implementations of the embodiments of the present application, the focusing lens 230 may be bonded to the inner wall of the mounting through hole 234. In other possible implementations of the embodiments of the present application, a fixing ring 236 may also be connected to the mounting through hole 234, and the fixing ring 236 is located on the side of the focusing lens 230 facing away from the lens limiting portion 235, so as to limit and fix the focusing lens 230 from the opposite side of the lens limiting portion 235. Exemplarily, the outer side of the fixing ring 236 may be provided with an external thread, and the inner wall of the mounting through hole 234 may be provided with an internal thread that matches the external thread. The fixing ring 236 is connected to the mounting through hole 234 by threaded connection.

[0106] An adjustment ring 237 may also be provided between the lens stopper 235 and the focusing lens 230, and the adjustment ring 237 is located between the lens stopper 235 and the focusing lens 230. During the assembly of the focusing lens 230 and the lens fixing member 233, the axial thickness of the adjustment ring 237 may be adjusted, thereby adjusting the position of the focusing lens 230, thereby improving the convenience of assembling and adjusting the focusing lens 230.

[0107] Exemplarily, one of the lens fixing member 233 and the packaging shell 210 is provided with a sliding recess 2133, which extends in the direction from the light-emitting unit 220 to the fluorescent conversion portion 215, and the other is provided with a sliding protrusion, which is slidably arranged in the sliding recess 2133, so that the lens fixing member 233 can slide relative to the packaging shell 210, thereby adjusting the position of the focusing lens 230, thereby improving the convenience of installing and adjusting the focusing lens 230. Exemplarily, the range in which the lens fixing member 233 can slide relative to the packaging shell 210 is 0 to 0.6 mm. After adjusting the positions of the lens fixing member 233 and the focusing lens 230, the lens fixing member 233 can be fixed by glue. In some possible implementations of the embodiments of the present application, reference is made to Figure 5 The sliding recess 2133 may be disposed on the bottom plate 213 of the packaging shell 210. The sliding protrusion may be disposed on the lens fixing member 233, for example, the bottom of the lens fixing member 233 is the sliding protrusion. In some other possible implementations of the embodiment of the present application, the sliding recess 2133 may also be disposed on the side of the lens fixing member 233 facing the bottom plate 213, and the sliding protrusion may be disposed on the bottom plate 213.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the present application.

[0109] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A laser projection display device, characterized in that: include: An optical engine configured to project an image outwardly, the optical engine comprising: An engine housing is configured with a first accommodating chamber; A laser, which is located in the first accommodating cavity and is configured to provide a white light source; the laser comprises: A packaging shell is configured with a second accommodating cavity, the packaging shell is provided with a light outlet, and a fluorescence conversion part is provided in the light outlet; A plurality of light-emitting units are located in the second accommodating cavity, each of the light-emitting units is configured to emit a sub-excitation light beam, and the sub-excitation light beams emitted by the plurality of light-emitting units form an excitation light beam to excite the fluorescence conversion part to generate white light; A focusing lens is located in the second accommodating cavity and between the fluorescence conversion part and the plurality of light-emitting units. The focusing lens is configured to focus the excitation light beam on the fluorescence conversion part and to make the light intensity of the excitation light beam emitted from the focusing lens present a flat-top distribution.

2. The laser projection display device according to claim 1, characterized in that: The focusing lens includes a first working surface and a second working surface opposite to each other. The first working surface faces the light-emitting unit and is a plane. The second working surface faces the fluorescence conversion portion and is a free-form surface or an aspherical surface.

3. The laser projection display device according to claim 2, characterized in that: The surface shape of the free-form surface conforms to the following formula: Wherein, C is greater than or equal to -0.9 and less than or equal to -0.7; k is greater than or equal to 0.26 and less than or equal to 1.28; a2 is greater than or equal to -1.20 and less than or equal to -0.87; a4 is greater than or equal to 0.05 and less than or equal to 0.14; a6 is greater than or equal to 0.26 and less than or equal to 0.67; a8 is greater than or equal to 0.05 and less than or equal to 3.28; a 10 Greater than or equal to -0.7 and less than or equal to 18.

62.

4. The laser projection display device according to claim 1, characterized in that: The laser also includes a lens fixing member for fixing the focusing lens; one of the lens fixing member and the packaging shell is provided with a sliding recessed portion, the sliding recessed portion extends along the direction in which the light-emitting unit points to the fluorescence conversion portion, and the other is provided with a sliding protrusion, the sliding protrusion is slidably arranged in the sliding recessed portion.

5. The laser projection display device according to any one of claims 1 to 4, characterized in that: The packaging shell includes an annular side wall and a bottom plate connected to one end of the annular side wall; the bottom plate is provided with a plurality of mounting parts on one side of the second accommodating cavity, and a mounting surface is provided on a side of the mounting part facing away from the bottom plate; Along the direction in which the fluorescence conversion portion points to the focusing lens, the plurality of mounting portions are arranged in sequence, and the distances between the mounting surfaces of the plurality of mounting portions and the bottom plate increase in sequence; The plurality of light-emitting units are respectively disposed on the mounting surfaces of the plurality of mounting portions, so that the sub-excitation light beams emitted by the light-emitting units are arranged in a multi-dimensional array.

6. The laser projection display device according to claim 5, characterized in that: The plurality of mounting parts include a first mounting part and a second mounting part, the second mounting part is closer to the fluorescent conversion part than the first mounting part, and the distance between the mounting surface of the second mounting part and the bottom plate is smaller than the distance between the mounting surface of the first mounting part and the bottom plate; The number of the light emitting units is four, wherein two of the light emitting units are arranged on the first mounting portion, and two of the light emitting units are arranged on the second mounting portion.

7. The laser projection display device according to claim 6, characterized in that: The four light emitting units are symmetrically arranged relative to the center line of the focusing lens; The light emitting sides of the two light emitting units located on the first mounting portion face the fluorescence conversion portion; The light-emitting sides of the two light-emitting units located on the second mounting portion are arranged opposite to each other, and two reflective elements are arranged between the two light-emitting units located on the second mounting portion, and the two reflective elements are symmetrically arranged relative to the center line of the focusing lens; the sub-excitation light beams emitted by the two light-emitting units located on the second mounting portion are respectively reflected by the two reflective elements and then incident on the focusing lens.

8. The laser projection display device according to claim 5, characterized in that: The material of the annular side wall is ceramic.

9. The laser projection display device according to claim 8, characterized in that: The annular side wall surrounds the bottom plate, and a conductive layer is provided on one side of the annular side wall located in the second accommodating cavity, and the conductive layer is electrically connected to the light-emitting unit; a via is provided in the annular side wall, and the via is electrically connected to the conductive layer, and an electrical connection end is formed at one end of the annular side wall close to the bottom plate.

10. A laser projection display device, characterized in that: include: An optical engine configured to project an image outwardly, the optical engine comprising: An engine housing is configured with a first accommodating chamber; A laser, which is located in the first accommodating cavity and is configured to provide a white light source; the laser comprises: A packaging shell is configured with a second accommodating cavity, the packaging shell is provided with a light outlet, and a fluorescence conversion part is provided in the light outlet; A plurality of light-emitting units, all located in the second accommodation cavity and configured to emit an excitation light beam; A focusing lens is located in the second accommodating cavity and between the fluorescence conversion part and the plurality of light-emitting units. The focusing lens is configured to focus the excitation light beam on the fluorescence conversion part and to ensure that the difference between the light intensity of the middle area and the light intensity of the edge area of ​​the excitation light beam emitted from the focusing lens is within a preset range.

Images