Laser projection assembly, laser projection device and control method thereof

Abstract

The present application relates to the field of laser projection technology, and particularly provides a laser projection assembly, a laser projection device and a control method thereof, aiming at solving the problem of large volume of the projector in the existing projection technology and the problem of inability to miniaturization. For this purpose, the laser projection assembly of the present application comprises: a first reflector, a second reflector and a laser source, the laser emitted by the laser source is deflected by the first reflector and the second reflector in turn and then projected onto a target plane; the first reflector is rotatably arranged, a first curved surface with gradually changing curvature is formed on the outer peripheral wall of the first reflector; the second reflector is rotatably arranged, the second reflector forms an annular structure around its own rotation axis, the first reflector is located inside the second reflector, and a second curved surface with gradually changing curvature is formed on the inner peripheral wall of the second reflector. According to the present application, two reflectors are arranged, and the two reflectors can be rotated to make the laser directly output the pixels on the target plane to form a complete two-dimensional image.

Description

Technical Field

[0001] This invention relates to the field of laser projection technology, and specifically provides a laser projection component, a laser projection device, and a control method thereof. Background Technology

[0002] Traditional projection equipment mainly includes DLP projectors and LCD projectors. DLP projectors primarily use a Digital Micromirror Device (DMD) chip as the imaging device, projecting an image by adjusting reflected light. LCD projectors, on the other hand, use a liquid crystal panel as the imaging device, along with a light guide plate, a light diffuser, and lenses to ultimately project the image onto a wall or screen.

[0003] In use, both DLP and LCD projectors first illuminate the imaging device to form an image, and then project the image from the imaging device onto a wall or screen. Therefore, the imaging device is one of the essential components of both DLP and LCD projectors.

[0004] However, the presence of imaging devices requires them to occupy a certain amount of space. Combined with the presence of components such as light guide plates and lenses, existing DLP projectors and LCD projectors are relatively large and cannot be miniaturized. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem that the projectors in the existing projection technology are large in size and cannot be miniaturized.

[0006] According to a first aspect of the present invention, a laser projection assembly is disclosed, comprising: a first reflector, a second reflector, and a laser source, wherein a laser emitted by the laser source is deflected sequentially by the first reflector and the second reflector and then projected onto a target plane; the first reflector is rotatably disposed, and a first curved surface with gradually changing curvature is formed on the outer peripheral wall of the first reflector; the first reflector adjusts the projection position of the laser in a first direction on the target plane by rotating to change the curvature at the laser incident position on the first curved surface; the second reflector is rotatably disposed, and a ring structure is formed around its own axis of rotation of the second reflector; the first reflector is located inside the second reflector, and a second curved surface with gradually changing curvature is formed on the inner peripheral wall of the second reflector, the second curved surface corresponding to the first curved surface; the second reflector adjusts the projection position of the laser in a second direction on the target plane by rotating to change the curvature at the laser incident position on the second curved surface, the first direction intersecting the second direction.

[0007] Furthermore, during the rotation of the first reflector, the incident and reflected rays of the laser on the first curved surface are coplanar, and the plane is the first optical path plane. Simultaneously, the axis of rotation of the first reflector is also located on the first optical path plane. The first optical path plane intersects the first curved surface to form a first intersection line, which has a straight portion. The incident position of the laser is located at the straight portion of the first intersection line. The first optical path plane intersects the second curved surface to form a second intersection line, which is also a straight line. During the rotation of the first and second reflectors, the angle between the straight portion of the first intersection line and the incident laser ray on the first curved surface gradually increases or decreases. Simultaneously, the angle between the second intersection line and the rotation axis of the first reflector remains unchanged, so that the projection position of the laser on the target plane in the first direction can be adjusted by the first reflector.

[0008] Furthermore, during the rotation of the first reflector, the position of the laser incident point on the first curved surface and the distance between it and the axis of rotation of the first reflector remain unchanged.

[0009] Furthermore, during the rotation of the first reflector, the position of the laser incident point on the first curved surface and the distance between it and the laser source remain unchanged.

[0010] Furthermore, the second curved surface has a cross-section through the second intersection line. During the rotation of the second reflector, the angle between the cross-section and the first optical path plane in the second direction increases or decreases, so as to adjust the projection position of the laser on the target plane in the second direction through the second reflector.

[0011] Furthermore, the inner peripheral wall of the second reflector has a radially symmetrical structure.

[0012] Furthermore, the second curved surface has a first position and a second position that are arranged opposite to each other, and the first position and the second position are located on the symmetrical surface of the second curved surface; in the inner circumferential direction of the second reflector, from the first position to the second position, the angle between the tangent and the first optical path plane in the second direction gradually increases.

[0013] Furthermore, the first direction is perpendicular to the second direction.

[0014] According to a second aspect of the present invention, a laser projection device is also disclosed, comprising the laser projection component described above.

[0015] According to a third aspect of the present invention, a control method for the above-described laser projection device is also disclosed, comprising the following steps: Step S10: establishing a coordinate system, wherein a y-axis is established along the first direction and an x-axis is established along the second direction, wherein each frame image has multiple pixel rows in the y-axis direction and each pixel row has multiple pixels in the x-axis direction; Step S20: sequentially encoding consecutive frame images into odd frames and even frames, and based on the coordinate system, encoding the pixels of the odd frame images in a first order and encoding the pixels of the even frame images in a second order, wherein in the first order and the second order, the pixel output order within the same pixel row is the same, while the output order of the pixel row is reversed.

[0016] Further, in step S20, the first sequence is: taking the intersection of the x-axis and the y-axis as the origin, outputting from the first pixel of the pixel row farthest from the origin to the last pixel of the pixel row closest to the origin, wherein, within the same pixel row, the pixel closest to the origin is the first pixel, and the pixel farthest from the origin is the last pixel.

[0017] Further, in step S20, the second sequence is: taking the intersection of the x-axis and the y-axis as the origin, outputting from the first pixel of the pixel row closest to the origin to the last pixel of the pixel row farthest from the origin, wherein, within the same pixel row, the pixel closest to the origin is the first pixel, and the pixel farthest from the origin is the last pixel.

[0018] The laser projection component of this invention, by setting a first reflector and a second reflector, allows the laser to reciprocate directly along a first and a second direction on the target plane by rotating the first and second reflectors, thereby outputting pixels to form a complete two-dimensional image. Compared with existing DLP projectors and LCD projectors, since pre-image formation is not required, imaging devices and related components such as guide plates and lenses are not needed, which greatly reduces the space occupied and the size of the laser projection component, thus achieving miniaturization of the projection device.

[0019] Solution 1. A laser projection component, characterized in that it comprises: a first reflector (10), a second reflector (20) and a laser source (30), wherein the laser emitted by the laser source (30) is deflected sequentially by the first reflector (10) and the second reflector (20) and then projected onto a target plane (50);

[0020] The first reflector (10) is rotatably disposed, and a first curved surface (11) with gradually changing curvature is formed on the outer peripheral wall of the first reflector (10). The first reflector (10) changes the curvature at the laser incident position on the first curved surface (11) by rotating, so as to adjust the projection position of the laser in the first direction of the target plane (50).

[0021] The second reflector (20) is rotatably disposed and forms an annular structure around its own axis of rotation. The first reflector (10) is located inside the second reflector (20). A second curved surface (21) with gradually changing curvature is formed on the inner peripheral wall of the second reflector (20). The second curved surface (21) corresponds to the first curved surface (11). The second reflector (20) changes the curvature at the laser incident position on the second curved surface (21) by rotating, so as to adjust the projection position of the laser on the target plane (50) in the second direction. The first direction intersects the second direction.

[0022] Option 2. The laser projection component according to Option 1, characterized in that,

[0023] During the rotation of the first reflector (10), the incident and reflected rays of the laser on the first curved surface (11) are coplanar, and the plane is the first optical path plane (40). At the same time, the axis of rotation of the first reflector (10) is also located on the first optical path plane (40).

[0024] Option 3. The laser projection component according to Option 2, characterized in that,

[0025] The first optical path plane (40) intersects with the first curved surface (11) to form a first intersection line (41), the first intersection line (41) has a straight section, and the incident position of the laser is located at the straight section of the first intersection line (41);

[0026] The first optical path plane (40) intersects with the second curved surface (21) to form a second intersection line (42), and the second intersection line (42) is a straight line;

[0027] During the rotation of the first reflector (10) and the second reflector (20), the angle between the straight portion of the first intersection line (41) and the incident light of the laser on the first curved surface (11) gradually increases or decreases. At the same time, the angle between the second intersection line (42) and the rotation axis of the first reflector remains unchanged, so as to adjust the projection position of the laser on the first direction of the target plane (50) by the first reflector (10).

[0028] Option 4. The laser projection component according to Option 2, characterized in that,

[0029] During the rotation of the first reflector (10), the position of the laser incident point on the first curved surface (11) and the distance between it and the axis of rotation of the first reflector (10) remain unchanged.

[0030] Option 5. The laser projection component according to Option 4, characterized in that,

[0031] During the rotation of the first reflector (10), the position of the laser incident point on the first curved surface (11) and the distance from the laser source (30) remain unchanged.

[0032] Solution 6. The laser projection component according to Solution 3, characterized in that,

[0033] The second curved surface (21) has a tangent that passes through the second intersection line (42). During the rotation of the second reflector (20), the angle between the tangent and the first optical path plane (40) in the second direction increases or decreases, so as to adjust the projection position of the laser on the target plane (50) in the second direction by means of the second reflector (20).

[0034] Solution 7. The laser projection component according to Solution 6, characterized in that,

[0035] The inner peripheral wall of the second reflector (20) has a radially symmetrical structure.

[0036] Solution 8. The laser projection component according to Solution 7, characterized in that,

[0037] The second curved surface (21) has a first position (211) and a second position (212) arranged opposite to each other, the first position (211) and the second position (212) being located on the symmetrical surface of the second curved surface (21);

[0038] In the inner circumferential direction of the second reflector (20), from the first position (211) to the second position (212), the angle between the cross-section and the first optical path plane (40) in the second direction gradually increases.

[0039] Solution 9. The laser projection component according to Solution 1, characterized in that,

[0040] The first direction is perpendicular to the second direction.

[0041] Scheme 10. A laser projection device, characterized in that it includes a laser projection component as described in any one of Schemes 1 to 9.

[0042] Solution 11. A control method for a laser projection device according to Solution 10, characterized in that it includes the following steps:

[0043] Step S10: Establish a coordinate system, wherein a y-axis is established along the first direction and an x-axis is established along the second direction, wherein each frame of the image has multiple pixel rows in the y-axis direction and each pixel row has multiple pixels in the x-axis direction;

[0044] Step S20: Encode consecutive frame images into odd frames and even frames in sequence. Based on the coordinate system, encode the pixels of the odd frame images in a first order and encode the pixels of the even frame images in a second order. In the first order and the second order, the output order of pixels in the same pixel row is the same, while the output order of the pixel row is reversed.

[0045] Solution 12. The control method according to Solution 11, characterized in that, in step S20, the first sequence is:

[0046] The origin is the intersection of the x-axis and the y-axis. Output starts from the first pixel of the pixel row farthest from the origin and ends at the last pixel of the pixel row closest to the origin. Within the same pixel row, the pixel closest to the origin is the first pixel, and the pixel farthest from the origin is the last pixel.

[0047] Scheme 13. The control method according to Scheme 11, characterized in that, in step S20, the second sequence is:

[0048] The origin is the intersection of the x-axis and the y-axis. Output starts from the first pixel of the row of pixels closest to the origin and ends at the last pixel of the row of pixels farthest from the origin. Within the same row of pixels, the first pixel is the pixel closest to the origin and the last pixel is the pixel farthest from the origin. Attached Figure Description

[0049] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0050] Figure 1 This is a schematic diagram of the structure of the laser projection component according to Embodiment 1 of the present invention;

[0051] Figure 2 This is a front view of the laser projection component according to Embodiment 1 of the present invention;

[0052] Figure 3a This is a schematic diagram of the laser reflection principle of the laser projection component in the first direction according to Embodiment 1 of the present invention;

[0053] Figure 3b This is another laser reflection principle diagram of the laser projection component in the first direction according to Embodiment 1 of the present invention;

[0054] Figure 3c This is another laser reflection principle diagram of the laser projection component in the first direction according to Embodiment 1 of the present invention;

[0055] Figure 4a This is a schematic diagram of the laser reflection principle of the laser projection component in the second direction according to Embodiment 1 of the present invention;

[0056] Figure 4b This is another laser reflection principle diagram in the second direction of the laser projection component of Embodiment 1 of the present invention;

[0057] Figure 4c This is another laser reflection principle diagram in the second direction of the laser projection component of Embodiment 1 of the present invention;

[0058] Figure 5 This is a schematic diagram of the structure of the second reflector of the laser projection assembly according to Embodiment 1 of the present invention;

[0059] Figure 6 This is a schematic diagram of the projection of the laser projection component of Embodiment 1 of the present invention onto the target plane;

[0060] Figure 7 This is a flowchart of the control method for the laser projection component according to Embodiment 1 of the present invention;

[0061] List of reference numerals in the attached diagram:

[0062] 10. First reflecting mirror; 11. First curved surface; 20. Second reflecting mirror; 21. Second curved surface; 211. First position; 212. Second position; 213. First part; 214. Second part; 30. Laser source; 40. First optical path plane; 41. First intersection line; 42. Second intersection line; 50. Target plane. Detailed Implementation

[0063] The present invention will be further described below with reference to embodiments, but the scope of protection of the present invention is not limited to the contents of the specification.

[0064] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0065] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0066] It should be noted that in the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] like Figure 1 and Figure 2The first embodiment of the present invention, as shown, discloses a laser projection assembly, including a first reflector 10, a second reflector 20, and a laser source 30. The laser emitted by the laser source 30 is deflected sequentially by the first reflector 10 and the second reflector 20 before being projected onto a target plane 50. The first reflector 10 is rotatably configured, and a first curved surface 11 with gradually changing curvature is formed on its outer peripheral wall. The first reflector 10 changes the curvature at the laser incident position on the first curved surface 11 by rotating, thereby adjusting the projection position of the laser on the target plane 50 in a first direction. The second reflector 20 is rotatably configured, and a ring structure is formed around its own axis of rotation. The first reflector 10 is located inside the second reflector 20, and a second curved surface 21 with gradually changing curvature is formed on its inner peripheral wall. The second curved surface 21 corresponds to the first curved surface 11. The second reflector 20 changes the curvature at the laser incident position on the second curved surface 21 by rotating, thereby adjusting the projection position of the laser on the target plane 50 in a second direction, where the first and second directions intersect.

[0069] In use, the laser projection component of the present invention has both the first reflector 10 and the second reflector 20 rotating at high speed, such as... Figures 3a to 3c As shown, the laser emitted by the laser source 30 first illuminates the first curved surface 11 of the first reflector 10, then reflects off the first curved surface 11 and illuminates the second curved surface 21 of the second reflector 20, and finally reflects off the second curved surface 21 onto the target plane 50. The laser emitted by the laser source 30 is projected onto the target plane 50 to form a pixel. Because the curvature of the first curved surface 11 is gradually changing, during the high-speed rotation of the first reflector 10, the curvature at the laser incident position on the first curved surface 11 continuously changes, causing the projection position of the pixel on the target plane 50 in the first direction to continuously change, even if the laser... Figures 3a to 3c The laser moves back and forth in the up and down direction. Correspondingly, since the curvature of the second surface 21 is also gradually changing, the curvature at the laser incident position on the second surface 21 also changes continuously during the high-speed rotation of the second reflector 20, causing the projection position of the pixel on the target plane 50 in the second direction to change continuously. Even though the laser moves repeatedly from left to right in Figure 4, the pixels are distributed on the target plane 50 to scan and form a complete two-dimensional image.

[0070] The laser projection assembly of this invention, by setting a first reflector 10 and a second reflector 20, allows the laser to reciprocate directly along a first and a second direction on the target plane 50 by rotating the first reflector 10 and the second reflector 20, thereby outputting pixels to form a complete two-dimensional image. Compared with existing DLP projectors and LCD projectors, since pre-image formation is not required, imaging devices and related components such as guide plates and lenses are not needed, which greatly reduces the space occupied and the size of the laser projection assembly, thus achieving miniaturization of the projection device.

[0071] It should be noted that the rotation speed of the first reflector 10 and the second reflector 20 in this invention is at least 100 revolutions per second, so that the laser can complete the scanning of each frame of image in a very short time and present a complete picture to the user by utilizing the visual persistence phenomenon of the human.

[0072] After the laser beam strikes the first curved surface 11, it is reflected onto the second reflecting mirror 20, and then reflected again onto the target plane 50 by the second curved surface 21 of the second reflecting mirror 20. The laser beam before being reflected by the first curved surface 11 is the incident light ray of the first curved surface 11. The laser beam before being reflected by the second curved surface 21 after being reflected by the first curved surface 11 is the reflected light ray of the first curved surface 11. It can be understood that the reflected light ray of the first curved surface 11 is also the incident light ray of the second curved surface 21, and the light ray after being reflected by the second curved surface 21 is the reflected light ray of the second curved surface 21.

[0073] According to common knowledge in the art, the incident light ray and the reflected light ray of the first curved surface 11 must lie in the same plane. Therefore, in this embodiment, the plane containing the incident light ray and the reflected light ray of the laser on the first curved surface 11 is called the first optical path plane 40. In order to ensure that the laser moves back and forth on the target plane 50 only in the first direction during the rotation of the first reflecting mirror 10, it is necessary to ensure that the axis of rotation of the first reflecting mirror 10 is always located on the first optical path plane 40. That is to say, the incident light ray, the reflected light ray, and the axis of rotation of the first reflecting mirror 10 on the first curved surface 11 are all located in the same plane.

[0074] Understandably, since the first reflecting mirror 10 is located inside the second reflecting mirror 20, and both require high-speed rotation, the rotation axes of the first reflecting mirror 10 and the second reflecting mirror 20 are aligned to ensure stable operation and prevent collisions and damage. Furthermore, since the rotation axis of the first reflecting mirror 10 lies on the first optical path plane 40, by cutting a section along the first optical path plane 40 between the first reflecting mirror 10 and the second reflecting mirror 20, the following can be obtained: Figures 3a to 3c The first reflecting mirror 10 and the second reflecting mirror 20 are shown in axial cross-sectional views.

[0075] exist Figure 3a In the first optical path plane 40, the first curved surface 11 intersects to form a first intersection line 41, which has a straight portion. The incident position of the laser is located at the straight portion of the first intersection line 41. The first optical path plane 40 intersects with the second curved surface 21 to form a second intersection line 42, which is also a straight line. During the rotation of the first reflecting mirror 10 and the second reflecting mirror 20, the angle α between the straight portion of the first intersection line 41 and the incident laser ray on the first curved surface 11 gradually changes. Simultaneously, the angle between the second intersection line 42 and the rotation axis of the first reflecting mirror 10 remains unchanged. This allows the projection position of the laser pixel on the target plane 50 in the first direction to be adjusted by rotating the first reflecting mirror 10. In other words, as... Figure 3b and Figure 3c As shown, when the laser irradiates the high-speed rotating first reflecting mirror 10, the angle α between the incident light ray on the first curved surface 11 and the first intersection line 41 changes continuously during the rotation. Therefore, the incident angle of the incident light ray on the first curved surface 11 changes at different positions when the laser irradiates it, resulting in a change in the reflected light ray on the first curved surface 11. Since the angle between the second intersection line 42 and the rotation axis of the first reflecting mirror 10 remains constant, the laser can ultimately reciprocate in the first direction of the target plane 50. Even if the laser can... Figures 3a to 3c The target plane 50 moves back and forth between its upper, middle and lower parts.

[0076] As can be seen, the laser projection component of the present invention sets a first curvature, so that the curvature of the first curved surface 11 changes continuously during the rotation process, thereby causing the angle α between the incident laser light on the first curved surface 11 and the first intersection line 41 to gradually increase or decrease, thereby realizing periodic reciprocating movement in the first direction of the target plane 50.

[0077] It should be noted that during the rotation of the first reflector 10, in order to ensure the stability of laser reflection, the distance between the position of the laser incident point on the first curved surface 11 and the rotation axis of the first reflector 10 remains unchanged. At the same time, the distance between the position of the laser incident point on the first curved surface 11 and the laser source 30 remains unchanged, so as to ensure that the laser only undergoes a change in angular reflectivity after being reflected by the first curved surface 11, while the position of the reflected laser remains unchanged.

[0078] As shown in Figure 4, the second curved surface 21 has a tangent that passes through the second intersection line 42. During the rotation of the second reflector 20, the angle between the tangent and the first optical path plane 40 in the second direction changes continuously, so as to adjust the projection position of the laser on the target plane 50 in the second direction through the second reflector 20.

[0079] like Figures 4a to 4cAs shown, when the laser irradiates the high-speed rotating second reflector 20, the angle between the tangent and the first optical path plane 40 in the second direction changes continuously during the rotation. Therefore, when the laser irradiates different positions on the second curved surface 21, the incident angle between the laser reflected from the first curved surface 11 (i.e., the incident light on the second curved surface 21) and the second curved surface 21 in the second direction also changes. This causes the reflection angle of the reflected light on the second curved surface 21 to change accordingly. Thus, the laser can ultimately reciprocate in the second direction of the target plane 50. Even if the laser can reciprocate between the left, middle, and right parts of the target plane 50 in Figure 4...

[0080] As can be seen, the laser projection component of the present invention sets a second curved surface 21, so that the curvature of the laser incident point position of the second curved surface 21 changes continuously during the rotation process, thereby causing the angle between the incident light of the laser on the second curved surface 21 and the second intersection line 42 to gradually increase or decrease, thereby realizing periodic reciprocating movement in the second direction of the target plane 50.

[0081] It should be noted that, as Figure 5 As shown, the inner peripheral wall of the second reflector 20 has a radially symmetrical structure, that is, the second curved surface 21 has a symmetrical structure. The second curved surface 21 has a first position 211 and a second position 212 arranged opposite to each other, located on the symmetrical surface of the second curved surface 21. In the inner peripheral direction of the second reflector 20, from the first position 211 to the second position 212, the angle between the tangent and the first optical path plane 40 in the second direction gradually increases. In other words, the second curved surface 21 includes a mirror-symmetrical first part 213 and a second part 214. The first part 213 has a first end and a second end, and the second part 214 also has a first end and a second end. The slope of the first part 213 of the second curved surface 21 gradually increases from the second end to the first end. Correspondingly, the slope of the second part 214 of the second curved surface 21 also gradually increases from the second end to the first end. However, due to the symmetrical structure, the slopes of the first part 213 and the second part 214 of the second curved surface 21 are always opposite. Furthermore, the first end of the first portion 213 of the second curved surface 21 and the first end of the second portion 214 of the second curved surface 21 converge at the first position 211 to form a sudden change point, while the second end of the first portion 213 of the second curved surface 21 and the second end of the second portion 214 of the second curved surface 21 connect at the second position 212, and the slope at the connection position is 0. It should be noted that the "slope" here is defined as the angle between the tangent of the second curved surface 21 and the first optical path plane 40 in the second direction.

[0082] Due to the existence of the abrupt change point, during the projection process, as the second reflector 20 rotates continuously, the laser also periodically passes through the abrupt change point, causing the laser to continuously move from the left side to the right side of the target plane 50 in Figure 4, and after moving to the far right, it jumps back to the far left side and repeats the cycle.

[0083] Furthermore, in order to ensure that the projected image is rectangular, the first direction is perpendicular to the second direction.

[0084] According to a second aspect of the present invention, a laser projection device is also disclosed, comprising the laser projection component described above.

[0085] According to a third aspect of the present invention, a control method for the above-described laser projection device is also disclosed, comprising the following steps:

[0086] Step S10: Establish a coordinate system, wherein the y-axis is established along the first direction, the x-axis is established along the second direction, each frame of the image has multiple pixel rows in the y-axis direction, and each pixel row has multiple pixels in the x-axis direction;

[0087] Step S20: Encode consecutive frame images into odd frames and even frames in sequence. Based on the coordinate system, encode the pixels of the odd frame images in a first order and encode the pixels of the even frame images in a second order. In the first order and the second order, the output order of pixels in the same pixel row is the same, while the output order of pixel rows is reversed.

[0088] In step S20, the first sequence is: taking the intersection of the x-axis and y-axis as the origin, outputting from the first pixel of the pixel row farthest from the origin to the last pixel of the pixel row closest to the origin. Within the same pixel row, the pixel closest to the origin is the first pixel, and the pixel farthest from the origin is the last pixel.

[0089] In step S20, the second sequence is as follows: taking the intersection of the x-axis and y-axis as the origin, outputting from the first pixel of the pixel row closest to the origin to the last pixel of the pixel row farthest from the origin. Within the same pixel row, the pixel closest to the origin is the first pixel, and the pixel farthest from the origin is the last pixel.

[0090] Specifically, such as Figure 6 In the embodiment shown, when controlling the laser projection device to project, a Cartesian coordinate system needs to be established on the target plane 50 first. The y-axis is established along the first direction (vertical direction) of the target plane 50, and the x-axis is established along the second direction (horizontal direction) of the target plane 50. During the projection process, the first reflecting mirror 10 controls the laser projection by rotating. Figure 6As shown, the laser moves periodically from top to bottom and then from bottom to top along the y-axis direction of the target plane 50, while the second reflector 20 controls the laser's movement by rotating. Figure 5 The target plane 50 shown moves periodically from left to right along the x-axis.

[0091] It should be noted that, in order to ensure that the y-axis direction remains unchanged when the laser moves within the same pixel row, the rotational speed of the second reflector 20 should be greater than the rotational speed of the first reflector 10. Specifically, if the number of pixel rows in the y-axis direction is 'a', the number of pixel rows in the x-axis direction is 'b', and the laser is emitted at a uniform time interval 't0'; the first reflector 10 rotates uniformly with a period of 2a × b × 't0'; and the second reflector 20 rotates uniformly with a period of b × 't0', that is, the rotational period of the first reflector 10 is 2a times that of the first reflector 10. In other words, the rotational speed of the second reflector 20 should be 2a times the rotational speed of the first reflector 10. Preferably, the rotational speed of the second reflector 20 can be at least 50 times the rotational speed of the first reflector 10.

[0092] like Figure 6 The illustrated embodiment uses a 100-pixel image as an example. Each frame has 10 pixels along the x-axis and 10 pixel rows along the y-axis. In odd-numbered frames, the laser moves from top to bottom and from left to right, i.e., the laser moves from... Figure 6 When the laser is positioned at the leftmost position of the first pixel row, it projects to pixel 1. Then, moving a distance to the right along the x-axis, it projects to pixel 2, and so on, until the last pixel of the first pixel row, which is pixel 10. Afterward, the incident position of the laser on the second curved surface 21 passes through the abrupt change point, thus jumping back... Figure 6 The leftmost position is where the laser moves along the y-axis to the second pixel row. Then, starting from the leftmost position of the second pixel row, it projects sequentially to the right, forming pixels 11-20. This process repeats again, passing through the abrupt change point, until the last pixel of the tenth pixel row, pixel 100, thus completing the projection of this odd-numbered frame.

[0093] After the odd-numbered frames are projected, it's time for the even-numbered frames. At this point, the laser moves from bottom to top and from left to right, meaning the laser moves from... Figure 6 When the laser is at the leftmost position of the tenth pixel row, it projects to pixel number 91. Then, moving one distance to the right along the x-axis, it projects to pixel number 92, and so on, until the last pixel of the last pixel row, which is pixel number 100. Afterward, the incident position of the laser on the second curved surface 21 passes through the abrupt change point, thus jumping back... Figure 6The leftmost position is where the laser moves along the y-axis to the ninth pixel row. Then, starting from the leftmost position of the ninth pixel row, it projects sequentially to the right, forming pixels 81-90. This process repeats again, passing through the abrupt change point, until the last pixel of the first pixel row, pixel 10, thus completing the projection of that even-numbered frame and completing one full cycle.

[0094] Due to the characteristics of laser movement in the laser projection device of this invention, during the image frame encoding stage, consecutive frame images need to be encoded sequentially into odd-numbered frames and even-numbered frames, with a frame order of p. Based on the coordinate system, the pixels of the odd-numbered frame images are encoded in a first order, and the pixels of the even-numbered frame images are encoded in a second order.

[0095] The first order is: taking the intersection of the x-axis and y-axis as the origin, outputting starting from the first pixel of the row of pixels farthest from the origin (e.g., ...). Figure 6 From pixel 1 of the first pixel row shown, to the last pixel of the pixel row closest to the origin (as shown in the image). Figure 6 The image ends at pixel number 100 in the tenth pixel row shown. Within the same pixel row, the pixel closest to the origin is the first pixel, and the pixel farthest from the origin is the last pixel (i.e., ...). Figure 6 (Pixels are output from left to right).

[0096] The second order is: taking the intersection of the x-axis and y-axis as the origin, outputting starting from the first pixel of the row of pixels closest to the origin (e.g., ...). Figure 6 The process begins with pixel 91 in the tenth pixel row (as shown), and ends with the last pixel in the row furthest from the origin (e.g., ...). Figure 6 The first pixel in the first pixel row shown is pixel number 10. Within the same pixel row, the pixel closest to the origin is the first pixel, and the pixel farthest from the origin is the last pixel (i.e.,...). Figure 6 (Pixels are output from left to right).

[0097] It can be seen that in the first and second sequences, the pixel output order within the same pixel row is the same (i.e., both are from...). Figure 6 Pixels are output from left to right, and the output order of pixel rows is reversed. The coordinates of any pixel in each frame are represented as (x, y).

[0098] During image signal modulation, the scan time t(p, x, y) of any pixel in any frame is given, where the scan time interval between pixels is uniformly t0. This yields the brightness B(p, x, y) and color C(p, x, y) of any pixel in any frame. The demodulation formula for the corresponding pixel output is then:

[0099] t(p,x,y)={K odd×[a×b×(p-1)+b×(ay)+x]+K even×[a×b×(p-1)+b×(y-1)+x]}×t0;

[0100] Wherein, when p is odd, K_odd = 1 and K_even = 0; when p is even, K_odd = 0 and K_even = 1;

[0101] It should be noted that K_odd and K_even are coefficients. The purpose of introducing coefficients is simply to represent piecewise functions so that both odd and even frames can be covered in one formula.

[0102] According to the above formula, the control electrical signal for laser scanning of any pixel (p, x, y) can be expressed as f(p, x, y, B(p, x, y), C(p, x, y)), further expressed as f(t(p, x, y), B(p, x, y), C(p, x, y)), and simplified as f(t, B, C). This enables image output.

[0103] Understandably, in order to ensure the clarity of the first and tenth pixel rows, the first and tenth pixel rows are not located at the extreme positions of the laser projection range (y-axis direction), but are at a certain distance from the extreme positions of the laser projection, so as to ensure that the laser will pass through the positions of the first and tenth pixel rows in both odd and even frames.

[0104] The laser projection device and control method of the present invention, by setting a first reflector 10 and a second reflector 20, allows the laser to reciprocate directly in a first direction and a second direction on the target plane 50 by rotating the first reflector 10 and the second reflector 20, thereby forming a complete two-dimensional image from pixels. Compared with existing DLP projectors and LCD projectors, since pre-image formation is not required, imaging devices and related components such as guide plates and lenses are not needed, which greatly reduces the space occupied and the size of the laser projection component, thereby achieving miniaturization of the projection device.

[0105] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0106] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0107] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0108] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A laser projection component, characterized in that, include: The system consists of a first reflector (10), a second reflector (20), and a laser source (30). The laser emitted by the laser source (30) is deflected sequentially by the first reflector (10) and the second reflector (20) and then projected onto the target plane (50). The first reflector (10) is rotatably disposed, and a first curved surface (11) with gradually changing curvature is formed on the outer peripheral wall of the first reflector (10). The first reflector (10) changes the curvature at the laser incident position on the first curved surface (11) by rotating, so as to adjust the projection position of the laser in the first direction of the target plane (50). The second reflector (20) is rotatably disposed and forms an annular structure around its own axis of rotation. The first reflector (10) is located inside the second reflector (20). A second curved surface (21) with gradually changing curvature is formed on the inner peripheral wall of the second reflector (20). The second curved surface (21) corresponds to the first curved surface (11). The second reflector (20) changes the curvature at the laser incident position on the second curved surface (21) by rotating, so as to adjust the projection position of the laser on the target plane (50) in the second direction. The first direction intersects the second direction.

2. The laser projection assembly according to claim 1, characterized in that, During the rotation of the first reflector (10), the incident and reflected rays of the laser on the first curved surface (11) are coplanar, and the plane is the first optical path plane (40). At the same time, the axis of rotation of the first reflector (10) is also located on the first optical path plane (40).

3. The laser projection assembly according to claim 2, characterized in that, The first optical path plane (40) intersects with the first curved surface (11) to form a first intersection line (41), the first intersection line (41) has a straight section, and the incident position of the laser is located at the straight section of the first intersection line (41); The first optical path plane (40) intersects with the second curved surface (21) to form a second intersection line (42), and the second intersection line (42) is a straight line; During the rotation of the first reflector (10) and the second reflector (20), the angle between the straight portion of the first intersection line (41) and the incident light of the laser on the first curved surface (11) gradually increases or decreases. At the same time, the angle between the second intersection line (42) and the rotation axis of the first reflector remains unchanged, so as to adjust the projection position of the laser on the first direction of the target plane (50) by the first reflector (10).

4. The laser projection assembly according to claim 2, characterized in that, During the rotation of the first reflector (10), the position of the laser incident point on the first curved surface (11) and the distance between it and the axis of rotation of the first reflector (10) remain unchanged.

5. The laser projection assembly according to claim 4, characterized in that, During the rotation of the first reflector (10), the position of the laser incident point on the first curved surface (11) and the distance from the laser source (30) remain unchanged.

6. The laser projection assembly according to claim 3, characterized in that, The second curved surface (21) has a tangent that passes through the second intersection line (42). During the rotation of the second reflector (20), the angle between the tangent and the first optical path plane (40) in the second direction increases or decreases, so as to adjust the projection position of the laser on the target plane (50) in the second direction by means of the second reflector (20).

7. The laser projection assembly according to claim 6, characterized in that, The inner peripheral wall of the second reflector (20) has a radially symmetrical structure.

8. The laser projection assembly according to claim 7, characterized in that, The second curved surface (21) has a first position (211) and a second position (212) that are set opposite to each other, and the first position (211) and the second position (212) are located on the plane of symmetry of the second curved surface (21); In the inner circumferential direction of the second reflector (20), from the first position (211) to the second position (212), the angle between the cross-section and the first optical path plane (40) in the second direction gradually increases.

9. The laser projection assembly according to claim 1, characterized in that, The first direction is perpendicular to the second direction.

10. A laser projection device, characterized in that, Includes the laser projection assembly according to any one of claims 1 to 9.

11. A control method for a laser projection device according to claim 10, characterized in that, Includes the following steps: Step S10: Establish a coordinate system, wherein a y-axis is established along the first direction and an x-axis is established along the second direction, wherein each frame of the image has multiple pixel rows in the y-axis direction and each pixel row has multiple pixels in the x-axis direction; Step S20: Encode consecutive frame images into odd frames and even frames in sequence. Based on the coordinate system, encode the pixels of the odd frame images in a first order and encode the pixels of the even frame images in a second order. In the first order and the second order, the output order of pixels in the same pixel row is the same, while the output order of the pixel row is reversed.

12. The control method according to claim 11, characterized in that, In step S20, the first sequence is as follows: The origin is the intersection of the x-axis and the y-axis. Output starts from the first pixel of the pixel row farthest from the origin and ends at the last pixel of the pixel row closest to the origin. Within the same pixel row, the pixel closest to the origin is the first pixel, and the pixel farthest from the origin is the last pixel.

13. The control method according to claim 11, characterized in that, In step S20, the second sequence is as follows: The origin is the intersection of the x-axis and the y-axis. Output starts from the first pixel of the row of pixels closest to the origin and ends at the last pixel of the row of pixels farthest from the origin. Within the same row of pixels, the first pixel is the pixel closest to the origin and the last pixel is the pixel farthest from the origin.

Images