Laser beam scanning light machine and electronic equipment

Abstract

The utility model discloses a laser beam scanning light machine and electronic equipment, and the laser beam scanning light machine comprises a light source module, a speckle suppression module and a scanning module. The light source module comprises a laser light source with at least one color; the speckle suppression module comprises at least one speckle suppressor; the scanning module comprises a two-dimensional scanning mirror or two one-dimensional scanning mirrors; the sum of the number of the reflecting surfaces in the speckle suppression module and the scanning module is an even number. Based on the laser beam scanning light machine, the speckle suppression module is arranged in the light path of the laser beam scanning light machine, and the speckle suppression module comprises at least one speckle suppressor, so that the speckle contrast of image speckles is remarkably reduced, the definition and imaging quality of a projection picture are greatly improved, and finer and more vivid visual experience is brought to a user.

Description

Technical Field

[0001] This application relates to the technical field of optical devices, and particularly to a laser beam scanning optical machine and an electronic device. Background Art

[0002] Laser Beam Scanning (LBS) optical machine, as an optical projection technology, its core lies in controlling the direction of the laser beam through a scanning mirror system, realizing the positioning and projection of the beam on the imaging medium, thereby constructing a pixel array composed of countless laser points. This process makes full use of the visual persistence effect of the human eye, enabling continuously changing laser points to fuse into a continuous and smooth dynamic image in the human brain, bringing an unprecedented visual experience to users.

[0003] The technical advantages and application potential of LBS optical machines are extensive and profound. In the fields of augmented reality (AR) and virtual reality (VR), its compact and efficient design makes it possible to miniaturize and lightweight the device, greatly enhancing the user's immersion and interaction experience. In the field of three-dimensional scanning and imaging, the LBS optical machine can generate fine three-dimensional models with its high precision and efficiency, providing strong technical support for fields such as industrial design and digital protection of cultural heritage. In addition, in lidar sensing technology, the LBS optical machine also plays an important role, providing key data support for fields such as autonomous driving and robot navigation by accurately measuring distances and constructing three-dimensional maps of the environment.

[0004] However, although LBS optical machines show great application potential in multiple fields, the laser light sources they use inevitably bring speckle problems. Speckle phenomenon is a phenomenon of random light intensity distribution caused by the coherence of the laser beam. It will form granular and uneven spots on the projection image, seriously affecting the clarity and quality of the image. Therefore, how to effectively suppress speckle has become a key technical problem in improving the image quality of LBS optical machines.

[0005] The content described in this background art is only for facilitating the understanding of the relevant technologies in this field and is not regarded as an admission of the prior art. Summary of the Invention

[0006] In view of this, the embodiments of this application intend to provide a laser beam scanning optical machine. First, a speckle suppression module is set in the optical path of the laser beam scanning optical machine. The speckle suppression module includes at least one speckle suppressor, significantly reducing the occurrence of image speckle phenomenon. Then, a distortion correction module is set in the optical path of the scanning optical machine to correct the distortion generated by the scanning of the scanning mirror, thereby greatly improving the clarity and imaging quality of the projection screen and bringing a more delicate and realistic visual experience to users.

[0007] In a first aspect, an embodiment of the present application provides a laser beam scanning optical machine, including:

[0008] a light source module, a speckle suppression module, and a scanning module;

[0009] The light source module includes laser light sources of at least one color;

[0010] The speckle suppression module includes at least one speckle suppressor;

[0011] The scanning module includes a two-dimensional scanning mirror or two one-dimensional scanning mirrors;

[0012] The sum of the number of reflecting surfaces in the speckle suppression module and the scanning module is an even number.

[0013] Optionally, the speckle suppressor is a reflective speckle suppressor or a transmissive speckle suppressor;

[0014] If the speckle suppressor is a reflective speckle suppressor, the sum of the number of the reflective speckle suppressor and the scanning mirrors is an even number, or the sum of the number of the reflective speckle suppressor, the scanning mirrors, and the adjusting reflecting mirror is an even number;

[0015] If the speckle suppressor is a transmissive speckle suppressor, the number of scanning mirrors is an even number, or the sum of the number of scanning mirrors and the adjusting reflecting mirror is an even number;

[0016] The adjusting reflecting mirror is arranged in the speckle suppression module or the scanning module.

[0017] Optionally, the speckle suppressor includes a piezoelectric ceramic element;

[0018] If the speckle suppressor is a reflective speckle suppressor, the speckle suppressor further includes a reflective element;

[0019] If the speckle suppressor is a transmissive speckle suppressor, the speckle suppressor further includes a light-transmitting element.

[0020] Optionally, if the speckle suppression module includes one speckle suppressor, the speckle suppressor is arranged between the light source module and the scanning module, or the speckle suppressor is arranged between the scanning module and the light receiving surface;

[0021] If there are at least two speckle suppressors in the speckle suppression module, the at least two speckle suppressors are arranged between the light source module and the scanning module, or the at least two speckle suppressors are arranged between the scanning module and the light receiving surface, or some of the at least two speckle suppressors are arranged between the light source module and the scanning module, and the remaining speckle suppressors are arranged between the scanning module and the light receiving surface; the frequencies of the piezoelectric ceramic elements in the at least two speckle suppressors are the same or different.

[0022] Optionally, the light source module further includes: a feedback unit;

[0023] The feedback unit includes a beam splitter and a detector;

[0024] The beam splitter is configured to split the light emitted by the laser light source into a first light beam and a second light beam, the first light beam continues to propagate along the original path, and the second light beam is incident on the detector;

[0025] The detector is configured to monitor the output light intensity of the laser light source based on the second light beam.

[0026] Optionally, the light source module further includes: a collimation unit;

[0027] The collimation unit includes at least one collimation lens.

[0028] Optionally, if the light source module includes laser light sources of at least two colors, the light source module further includes a light combining unit, and the light combining unit is one of a light combining prism, a dichroic mirror, or an X prism.

[0029] Optionally, the laser beam scanning optical machine further includes: a distortion correction module;

[0030] The distortion correction module is arranged between the scanning module and the light receiving surface;

[0031] The distortion correction module includes at least one distortion correction lens.

[0032] Optionally, the two-dimensional scanning mirror is arranged on the object-side focal plane of the distortion correction module, or the one-dimensional scanning mirror close to the light source module is arranged on the object-side focal plane of the distortion correction module.

[0033] In a second aspect, an embodiment of the present application provides an electronic device, the electronic device includes: a memory, at least one processor connected to the memory, and a laser beam scanning optical machine according to any one of the first aspect;

[0034] The at least one processor processes the video or image stored in the memory and controls the laser beam scanning optical machine to project the desired image to be displayed.

[0035] Some of the other optional features and technical effects of the embodiments of the present application are described below, and some can be understood by reading this article. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Hereinafter, embodiments of the present application will be described in detail with reference to the drawings. The elements shown are not limited by the scale shown in the drawings. The same or similar reference numerals in the drawings denote the same or similar elements, where:

[0037] Figure 1 A schematic structural diagram of a laser beam scanning optical machine that can implement the embodiments of the present application is shown;

[0038] Figure 2 A schematic structural diagram of a reflective speckle suppressor that can implement the embodiments of the present application is shown;

[0039] Figure 3 A schematic structural diagram of a transmissive speckle suppressor that can implement the embodiments of the present application is shown;

[0040] Figure 4 A schematic structural diagram of another laser beam scanning optical machine that can implement the embodiments of the present application is shown;

[0041] Figure 5 A schematic structural diagram of yet another laser beam scanning optical machine that can implement the embodiments of the present application is shown;

[0042] Figure 6 A schematic structural diagram of an electronic device that can implement the embodiments of the present application is shown.

[0043] The labels in the figure are as follows: 101 - light source module, 102 - speckle suppression module, 103 - scanning module, 104 - light receiving surface, 201 - reflective speckle suppressor, 2011 - piezoelectric ceramic element, 2012 - reflective element, 301 - transmissive speckle suppressor, 3011 - piezoelectric ceramic element, 3012 - light transmissive element, 501 - distortion correction module, 601 - memory, 602 - processor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] To make the objectives, technical solutions, and advantages of the present application clearer and more understandable, the present application will be further described in detail below in conjunction with the specific embodiments and the drawings. Herein, the illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application.

[0045] As used herein, the term "comprising" and its variations denote open-ended inclusion, i.e., "including but not limited to". Unless otherwise specified, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "an exemplary embodiment" and "an embodiment" mean "at least one exemplary embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects. There may also be other explicit and implicit definitions hereinafter.

[0046] In an embodiment of the present application, a laser beam scanning optical machine is provided. Refer to Figure 1 . Figure 1 Fig. shows a schematic structural diagram of a laser beam scanning optical machine that can implement the embodiments of the present application. As Figure 1 shown, the laser beam scanning optical machine includes: a light source module 101, a speckle suppression module 102, a scanning module 103, and a light receiving surface 104.

[0047] Among them, the light source module 101 is used to emit a laser beam. The light source module 101 includes at least one color laser. In a scenario for monochromatic display, the light source module 101 only includes one color laser. In a scenario for color display, the light source module 101 needs to include at least two different color lasers.

[0048] Optionally, the light source module 101 further includes beam shaping elements, such as beam expanding and collimating lenses, etc., for adjusting the divergence angle and spot size of the laser beam emitted by the light source module, so that the spot size reaching the scanning module is adapted to the mirror surface size of the scanning mirror, and try to ensure that the spot size of the laser is less than or equal to the mirror surface size of the scanning mirror, thereby ensuring the resolution of the projection image while ensuring the light energy utilization rate.

[0049] Optionally, when the light source module 101 includes two or more different color lasers, the light source module further includes a light combining unit, and the light combining unit is any one of a light combining prism, a dichroic mirror, or an X prism.

[0050] The speckle suppression module 102 includes at least one speckle suppressor. Among them, the speckle suppressor can be a reflective speckle suppressor and / or a transmissive speckle suppressor. Refer to Figure 2 and Figure 3 .

[0051] The light receiving surface 104 can be a screen in a projection optical machine, a diffuser screen in a HUD, or other imaging planes.

[0052] Figure 2 Fig. shows a schematic structural diagram of a reflective speckle suppressor that can implement the embodiments of the present application. As Figure 2As shown, the reflective speckle suppressor 201 includes a piezoelectric ceramic element 2011 and a reflective element 2012. Specifically, in the reflective speckle suppressor, the piezoelectric ceramic element 2011 drives the reflective element 2012 to generate vibrations that are imperceptible to the human eye, thereby changing the phase difference between the lasers emitted from the reflective element 2012 at different times and destroying the coherence condition of the laser. When the speckle suppressor operates at a high frequency, multiple independent speckle images are generated within the integration time of the human eye. The image finally seen by the human eye is the intensity superposition of these multiple independent speckle images, and this intensity superposition is irregular, thus achieving the purpose of speckle suppression.

[0053] Figure 3 The structural schematic diagram of a transmissive speckle suppressor capable of implementing the embodiments of the present application is shown, as Figure 3 As shown, the transmissive speckle suppressor 301 includes a piezoelectric ceramic element 3011 and a light-transmitting element 3012. Specifically, ultrasonic waves are generated by the piezoelectric ceramic element 3011, and the ultrasonic waves propagate radially with the light-transmitting element 3012 as the medium. When the laser irradiates the light-transmitting element with ultrasonic wave action, Raman-Nath diffraction occurs, thereby reducing the coherence of the laser and achieving the purpose of speckle suppression.

[0054] Experiments have proved that adding the above-mentioned reflective speckle suppressor 201 or transmissive speckle suppressor 301 to the optical path can obtain a good speckle suppression effect.

[0055] In some embodiments, to further enhance the speckle suppression effect and reduce the speckle contrast, two or more speckle suppressors can be set, and the frequencies of the piezoelectric ceramics in the two or more speckle suppressors can be the same or different.

[0056] The speckle suppressor can be set before the scanning module (between the light source module and the scanning module), or can be set after the scanning module (between the scanning module and the light receiving surface). When the speckle suppression module includes two or more speckle suppressors, some of the speckle suppressors can also be located before the scanning module, and some other speckle suppressors can be located after the scanning module.

[0057] For example, when the speckle suppression module includes at least two speckle suppressors, the at least two speckle suppressors can all be located before the scanning module (between the light source module and the scanning module), or can all be located after the scanning module (between the scanning module and the light receiving surface), or at least some of the at least two speckle suppressors can be located before the scanning module, and the remaining part can be located after the scanning module.

[0058] It should be noted that when the speckle suppression module includes at least two speckle suppressors, the at least two speckle suppressors can all be reflective speckle suppressors, or can all be transmissive speckle controllers, or can be a combination of a reflective speckle controller and a transmissive speckle controller. The frequencies of the piezoelectric ceramic elements in the at least two speckle suppressors are the same or different.

[0059] It can be understood that the reflective speckle suppressor 201 can also be other devices in the prior art that reflect the incident light beam and have a speckle suppression effect. Also, the transmissive speckle suppressor 301 can also be other devices in the prior art that transmit the incident light beam and have a speckle suppression effect.

[0060] The scanning module 103 scans a two-dimensional display image on the light receiving surface 104 through two-dimensional vibration in the first direction and the second direction. The scanning module 103 can include a 2D (two-dimensional) scanning mirror, or can include two 1D (one-dimensional) scanning mirrors (X scanning mirror and Y scanning). The 2D scanning mirror can scan in the first direction (for example, the X direction) and the second direction (for example, the Y direction) simultaneously, forming a two-dimensional display image on the light receiving surface 104. Since the 1D scanning mirror can only perform scanning in one direction, that is, either in the first direction or in the second direction, two 1D scanning mirrors are required to form a two-dimensional display image on the light receiving surface. It should be noted that the first direction and the second direction are perpendicular.

[0061] In the embodiments of the present application, the scanning mirror can be a MEMS (Micro-Electro-Mechanical System, optical micro-electro-mechanical system) scanning mirror, or can be a galvanometer type resonant mirror, etc.

[0062] It should be noted that according to the imaging characteristics of the reflecting mirror: an even number of reflecting surfaces form an image consistent with the object, and an odd number of reflecting surfaces form a mirror image. To ensure that the image viewed by the human eye is consistent with the actual object, it is necessary to ensure that the total number of reflecting surfaces in the laser beam scanning optical machine is an even number, that is, the sum of the number of reflecting surfaces in the speckle suppression module and the scanning module is an even number. See Figure 4 and Figure 5 .

[0063] Figure 4 Shows a schematic structural diagram of a laser beam scanning optical machine in which another embodiment of the present application can be implemented. As Figure 4As shown, the light source module includes lasers of three different colors: red (R-LD), green (G-LD), and blue (B-LD), a collimating unit, and a light combining unit. The collimating unit includes at least one collimating lens for collimating the light emitted by the lasers into parallel light beams. Optionally, as shown in the figure, the number of collimating units is the same as the number of lasers, that is, each collimating unit is respectively used to collimate the laser beam output by one laser.

[0064] It should be noted that if the light source module includes at least two types of laser light sources, the light source module further includes a light combining unit, and the light combining unit is any one of a light combining prism, a dichroic mirror, or an X prism. Figure 4 The illustrated embodiment is schematically described by taking the light combining prism as an example, but the present application does not specifically limit the type of the light combining unit.

[0065] As Figure 4 shown, the light combining unit is a light combining prism, and the light combining prism includes a plane reflecting surface and two dichroic color separation mirror surfaces glued together. The plane reflecting surface is used to reflect blue laser light, and the two color separation mirror surfaces are respectively used to transmit blue light and reflect green light, and transmit red light and reflect blue-green light. It can be understood that according to the different setting positions of different colors, the light combining prism can have different forms, such as the plane reflecting surface is used to reflect red laser light, and the two color separation mirror surfaces are respectively used to transmit red light and reflect green light, and transmit red-green light and reflect blue light.

[0066] As Figure 4 shown, the three-color laser light emitted by the red, green, and blue lasers is first collimated by their respective collimating lenses and then enters the light combining prism for light combination. The combined laser beam is reflected by the reflective speckle suppression module and then reaches the 2D MEMS scanning mirror. After being scanned by the MEMS scanning mirror, a projection image is formed on the light receiving surface, realizing the output of a color image.

[0067] Optionally, the light source module further includes a feedback unit, and the feedback unit includes a beam splitter and a detector. In some embodiments, the feedback unit is between the collimating unit and the speckle suppression module, that is, the collimating unit is arranged between the laser light source and the feedback unit. In some other embodiments, the collimating unit is arranged between the feedback unit and the speckle suppression module, that is, the feedback unit is adjacent to the laser light source. The beam splitter includes a beam splitting prism and a beam splitting plane mirror, and is used to split the main beam (the light emitted by the light source) into two parts. One part continues to propagate along the original optical path to realize projection, and the other part reaches the detector for monitoring the actual output light intensity of the laser module. The light energy reaching the detector is very small, generally not higher than 5%. By setting the beam splitter and the detector, negative feedback adjustment of the laser can be realized, improving the control accuracy of the light source, thereby ensuring the quality of the projection image.

[0068] Figure 5Another schematic diagram of a laser beam scanning optical machine structure that can implement the embodiment of the present application is shown. As shown in Figure 5, the scanning module includes an X scanning mirror and a Y scanning mirror, the X scanning mirror is used to scan along the horizontal direction of the projection screen, and the Y scanning mirror is used to scan along the vertical direction of the projection screen.

[0069] The speckle suppression module includes two reflective speckle suppressors, f1 and f2 are the vibration frequencies of the piezoelectric ceramic elements of the two speckle suppressors, and f1 is not equal to f2. Relevant experiments show that when two reflective speckle suppressors are used and the frequencies of the two reflective speckle suppressors are different, a better speckle control effect will be achieved.

[0070] Alternatively, if Figure 5 As shown, the laser beam scanning optical machine also includes a distortion correction module 501, which includes at least one distortion correction lens. The distortion correction module 501 is arranged between the scanning module and the light receiving surface. The distortion correction module 501 is used to provide negative distortion to correct the distortion caused by scanning by the scanning mirror, thereby improving the quality of the projected image.

[0071] In some embodiments, the distortion correction module 501 adopts an image-side telecentric optical path, and the scanning module is arranged on the object-side focal plane of the distortion correction module. It is understandable that if the scanning module includes a 2D scanning mirror, the 2D scanning mirror is arranged on the object-side focal plane of the distortion correction module, and if the scanning module includes two 1D scanning mirrors, the scanning mirror (such as the one located in the front (close to the light source module along the light emission direction) is ... Figure 5 The X-ray scanning mirror in the image processing module is arranged on the object focal plane of the distortion correction module.

[0072] Alternatively, if Figure 1 , Figure 4 and Figure 5 As shown, the laser beam scanning optical machine also includes a light receiving surface 104, which can be a transmissive light receiving surface, such as a diffusion screen in a HUD, or a reflective light receiving surface, such as a projection screen.

[0073] In some embodiments, to further suppress speckle, the light receiving surface 104 is a scattering screen having a particle structure, and the scattering screen can be stationary or moving.

[0074] It can be understood that the optical machine based on laser beam projection provided in the present application, in addition to the above-mentioned modules, also includes a laser driving module, a scanning mirror driving module and a speckle suppressor driving module, etc., so as to ensure the output of the required projection image of the optical machine.

[0075] In some embodiments, the sum of the number of reflective speckle suppressors 201 and the number of scanning mirrors is an even number. Exemplarily, when the scanning module 103 is composed of two 1D scanning mirrors, the speckle suppression module 102 includes an even number of reflective speckle suppressors, such as two. When the scanning module includes a 2D scanning mirror, the speckle suppression module includes an odd number of reflective speckle suppressors, such as one or three.

[0076] In some other embodiments, the total number of reflecting mirrors can also be adjusted to meet the imaging requirements by setting an adjusting mirror (e.g., a normal reflecting mirror) in the scanning module 103. The adjusting mirror can be arranged in the speckle suppression module or the scanning module. Exemplarily, when the speckle suppression module includes two reflective speckle suppressors, for example, a plane mirror can be arranged in front of the 2D scanning mirror in the scanning module 103, so that the sum of the number of reflective speckle suppressors 201 and the number of scanning mirrors is 4, meeting the requirement of an even number of reflecting mirrors.

[0077] That is to say, when the speckle suppressor is a reflective speckle suppressor, the sum of the number of reflective speckle suppressors and the number of scanning mirrors is an even number, or the sum of the number of reflective speckle suppressors, the number of scanning mirrors and the number of adjusting mirrors is an even number;

[0078] When the speckle suppressor is a transmissive speckle suppressor, the number of scanning mirrors is an even number, or the sum of the number of scanning mirrors and the number of adjusting mirrors is an even number.

[0079] The embodiments of the present application further provide an electronic device. Refer to Figure 6 , Figure 6 which shows a schematic structural diagram of an electronic device that can implement the embodiments of the present application. As Figure 6As shown, the electronic device includes: a memory 601, at least one processor 602 connected to the memory, and a laser beam scanning optical machine as described in any one of the first aspects. The memory 601 is used to store the original image signal or video signal. These signals can be pre-loaded digital files or real-time received streaming media data. The memory 601 can adopt high-speed and high-capacity storage media to ensure the rapidity and stability of data reading, providing a solid foundation for subsequent image processing. At least one processor 602 is connected to the memory 601 and is used to perform the task of image processing. The processor 602 reads the original image signal or video signal in the memory 601, and uses image processing algorithms to perform processing such as decoding, color correction, scaling, and enhancement on it to adapt to the display requirements of the laser beam scanning optical machine. At the same time, the processor 602 also generates timing control signals for regulating the working states of the modulator and scanning module inside the laser beam scanning optical machine. The laser beam scanning optical machine integrates a laser light source, an optical modulator, a beam scanning device, and necessary optical elements. The laser light source emits red, green, and blue lasers. After being precisely modulated by the optical modulator, the three-color lasers are combined into one beam, and are two-dimensionally or three-dimensionally scanned by the beam scanning device according to the instructions of the processor. By changing the intensity of the output light, gray-scale information is given to the scanning beam, so as to project the desired image on the projection screen.

[0080] Specifically, the device can be an HUD, AR / VR glasses, a home projector, etc. The device uses the laser beam scanning optical machine provided by the embodiments of the present application and includes a video source, an image processing module, a memory, etc. According to different application scenarios, the device also includes other optical components used in conjunction with the above optical machine, such as large and small reflectors in the HUD, optical waveguides in AR / VR glasses, etc.

[0081] In this article, multiple embodiments of the present application are described. However, for the sake of brevity, the descriptions of each embodiment are not exhaustive, and the same or similar features or parts between the embodiments may be omitted. In this article, "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean applicable to at least one embodiment or example according to the present application, rather than all embodiments. The above terms do not necessarily mean referring to the same embodiment or example. Without contradiction, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples.

[0082] Exemplary systems and methods of the present application have been specifically shown and described with reference to the above embodiments, which are merely examples of the best mode for implementing the systems and methods. Those skilled in the art will understand that various changes can be made to the embodiments of the systems and methods described herein when implementing the systems and / or methods without departing from the spirit and scope of the present application as defined in the appended claims.

Claims

1. A laser beam scanning optical machine, characterized in that, Including: A light source module, a speckle suppression module, and a scanning module; The light source module includes laser light sources of at least one color; The speckle suppression module includes at least one speckle suppressor; The scanning module includes a two-dimensional scanning mirror or two one-dimensional scanning mirrors; The sum of the number of reflecting surfaces in the speckle suppression module and the scanning module is an even number.

2. The laser beam scanning optical machine according to claim 1, characterized in that, The speckle suppressor is a reflective speckle suppressor or a transmissive speckle suppressor; If the speckle suppressor is a reflective speckle suppressor, the sum of the number of the reflective speckle suppressor and the scanning mirrors is an even number, or the sum of the number of the reflective speckle suppressor, the scanning mirrors, and the adjustment reflecting mirror is an even number; If the speckle suppressor is a transmissive speckle suppressor, the number of the scanning mirrors is an even number, or the sum of the number of the scanning mirrors and the adjustment reflecting mirror is an even number; The adjustment reflecting mirror is arranged in the speckle suppression module or the scanning module; 3. The laser beam scanning optical machine according to claim 1, wherein, The speckle suppressor includes a piezoelectric ceramic element; If the speckle suppressor is a reflective speckle suppressor, the speckle suppressor further includes a reflective element; If the speckle suppressor is a transmissive speckle suppressor, the speckle suppressor further includes a light-transmitting element; 4. The laser beam scanning optical machine according to claim 3, wherein, If the speckle suppression module includes one speckle suppressor, the speckle suppressor is arranged between the light source module and the scanning module, or the speckle suppressor is arranged between the scanning module and the light receiving surface; If the speckle suppression module includes at least two speckle suppressors, the at least two speckle suppressors are arranged between the light source module and the scanning module, or the at least two speckle suppressors are arranged between the scanning module and the light receiving surface, or some of the at least two speckle suppressors are arranged between the light source module and the scanning module, and the remaining speckle suppressors are arranged between the scanning module and the light receiving surface; the frequencies of the piezoelectric ceramic elements in the at least two speckle suppressors are the same or different.

5. The laser beam scanning optical machine according to any one of claims 1-4, characterized in that, The light source module further includes: a feedback unit; The feedback unit includes a beam splitter and a detector; The beam splitter is used for splitting the light emitted by the laser light source into a first light beam and a second light beam, the first light beam continues to propagate along the original path, and the second light beam is incident on the detector; The detector is used for monitoring the output light intensity of the laser light source based on the second light beam.

6. The laser beam scanning optical machine according to any one of claims 1-4, characterized in that, The light source module further includes: a collimation unit; The collimation unit includes at least one collimation lens.

7. The laser beam scanning optical machine according to any one of claims 1-4, characterized in that, If the light source module includes laser light sources of at least two colors, the light source module further includes a light combining unit, and the light combining unit is one of a light combining prism, a dichroic mirror, or an X prism.

8. The laser beam scanning optical machine according to any one of claims 1-4, characterized in that, The laser beam scanning optical machine further includes: a distortion correction module; The distortion correction module is arranged between the scanning module and the light receiving surface; The distortion correction module includes at least one distortion correction lens.

9. The laser beam scanning optical machine according to claim 8, wherein, The two-dimensional scanning mirror is arranged on the object-side focal plane of the distortion correction module, or the one-dimensional scanning mirror close to the light source module is arranged on the object-side focal plane of the distortion correction module.

10. An electronic device, characterized in that, The electronic device includes: a memory, at least one processor connected to the memory, and a laser beam scanning optical machine as described in any one of claims 1 to 9; The at least one processor processes the video or image stored in the memory and controls the laser beam scanning optical machine to project the desired image to be displayed.

Images