Laser light source and laser projection device

Abstract

A laser light source (2) and a laser projection device (100), which relate to the technical field of display. The laser projection device (100) comprises the laser light source (2), which comprises a beam homogenizer (22) and a driving module (24), wherein the beam homogenizer (22) comprises at least one coil (220) and a beam homogenizing element (231); the driving module (24) is connected to the at least one coil (220) and is configured to send an energization signal to the at least one coil (220), so that the at least one coil (220) is energized; and the beam homogenizing element (231) moves along a circular or elliptical trajectory under a magnetic force generated after the at least one coil (220) is energized, so that the beam homogenizing element (231) can achieve better beam homogenization and speckle reduction effects.

Description

Laser light source and laser projection device

[0001] The present application claims priority to the Chinese patent application No. 202410619519.1, filed on May 17, 2024, entitled “Laser projection device”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of display, in particular to a laser light source and a laser projection device. BACKGROUND

[0003] The laser projection device using the laser light source has better unidirectionality of laser, narrower wavelength range, and is easy to interfere, so that granular spots appear on the projected image, which is speckle. The speckle affects the quality of the projected image and reduces the viewing experience. Therefore, in the projection device, a light uniformization device is needed to be arranged to eliminate speckle and uniformize light, so as to improve the projection quality.

[0004] However, the light uniformization device in the related art generally has the problems of complex structure and large size.

[0005] DISCLOSURE

[0006] The present application provides a laser light source and a laser projection device.

[0007] In one aspect, the present application provides a laser light source, which comprises a light uniformization device and a driving module.

[0008] The light uniformization device comprises at least one coil and a light uniformization piece.

[0009] The driving module is connected with the at least one coil, and is used to send an energization signal to the at least one coil to make the at least one coil be energized. The light uniformization piece moves along a circular or elliptical trajectory under the magnetic force generated after the at least one coil is energized.

[0010] In another aspect, the present application provides a laser projection device, which comprises the laser light source provided by the present application. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0012] FIG. 1 is a schematic view of the appearance of a laser projection device according to an embodiment of the present application;

[0013] Fig. 2 is a three-dimensional schematic view of a partial structure of a laser projection device according to an embodiment of the present application;

[0014] Fig. 3 is a three-dimensional schematic view of a partial structure of a laser projection device according to another embodiment of the present application;

[0015] Fig. 4 is a circuit control schematic view of a laser projection device according to an embodiment of the present application;

[0016] Fig. 5 is a structural schematic view of a projection system according to an embodiment of the present application;

[0017] Fig. 6 is a structural side view of a laser light source according to another embodiment of the present application;

[0018] Fig. 7 is a structural top view of a laser light source according to another embodiment of the present application;

[0019] Fig. 8 is a structural schematic view of a laser according to an embodiment of the present application;

[0020] Fig. 9 is a structural schematic view of a partial structure of a laser light source according to an embodiment of the present application;

[0021] Fig. 10 is a structural schematic view of a light homogenizing device according to an embodiment of the present application;

[0022] Fig. 11 is a structural schematic view of a light homogenizing device according to another embodiment of the present application;

[0023] Fig. 12 is a structural schematic view of a circuit board according to an embodiment of the present application;

[0024] Fig. 13 is a waveform schematic view of an analog signal obtained by a first coil according to an embodiment of the present application;

[0025] Fig. 14 is a waveform schematic view of an analog signal obtained by a first coil according to another embodiment of the present application;

[0026] Fig. 15 is a structural schematic view of a circuit board according to another embodiment of the present application;

[0027] Fig. 16 is a structural schematic view of a circuit board according to another embodiment of the present application;

[0028] Fig. 17 is a structural schematic view of a second socket according to an embodiment of the present application;

[0029] Fig. 18 is a structural schematic view of a control unit according to an embodiment of the present application;

[0030] Fig. 19 is a structural schematic view of a driving unit according to an embodiment of the present application;

[0031] Fig. 20 is a structural schematic view of a partial structure of a driving unit according to an embodiment of the present application;

[0032] Fig. 21 is a waveform diagram of a digital signal output by a control unit according to an embodiment of the present application;

[0033] Fig. 22 is a waveform diagram of a digital signal output by a control unit according to another embodiment of the present application;

[0034] Fig. 23 is a voltage waveform diagram of a first power-on signal according to an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0036] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the following described embodiments, and is not intended to limit the embodiments of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0037] In addition, the terms "comprise" and "have" and any variations thereof are intended to cover but not exclusively include, for example, a product or device that includes a series of components does not have to be limited to those components clearly listed, but can include other components that are not clearly listed or inherent to these products or devices.

[0038] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely in the description of the present application combined with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0042] Fig. 1 is a schematic view of the appearance of a laser projection device according to an embodiment of the present application, which includes a first housing, which can include a first housing wall 102, a second housing wall, a third housing wall, a fourth housing wall 105, a bottom housing and a top housing 107. It can be understood that, for the convenience of illustration, the second housing wall, the third housing wall and the bottom housing are not shown in Fig. 1.

[0043] The bottom housing and the top housing 107 can be oppositely arranged, the first housing wall 102 and the third housing wall can be the front side wall and the rear side wall of the device respectively, and the second housing wall and the fourth housing wall 105 can be the left side wall and the right side wall of the device respectively.

[0044] Based on this, for example, the second housing wall 103, the fourth housing wall 105 and the top housing 107 can be an integral structure, which can be connected to the bottom housing through a threaded connection, and connected to the first housing wall 102 and the third housing wall through a clamping connection. Of course, the first housing wall 102, the second housing wall, the third housing wall, the fourth housing wall 105, the bottom housing and the top housing 107 can also be connected by other forms, which are not limited in the present application.

[0045] In some embodiments, the fourth housing wall 105 is provided with a second heat dissipation hole 1051, and the second housing wall opposite to the fourth housing wall 105 is provided with a first heat dissipation hole. The heat dissipation system arranged in the laser projection device 100 can drive the airflow to flow from one of the first heat dissipation hole and the second heat dissipation hole 1051 to the other.

[0046] FIG. 2 is a three-dimensional schematic diagram of a partial structure of a laser projection device according to an embodiment of the present application. As shown in FIG. 2, in some embodiments, the laser projection device 100 includes a laser light source 2, an optical engine system 1, and a lens 3. The laser light source 2 is configured to provide an illumination light beam. The optical engine system 1 is disposed in the optical path of the illumination light beam and is configured to adjust the illumination light beam to obtain a projection light beam. The lens 3 is configured to image the projection light beam. The optical engine system 1 can also be referred to as an optical engine, an optical modulation assembly, etc.

[0047] For example, the laser light source 2 can be a three-color light source including a red laser assembly, a blue laser assembly, a green laser assembly, and a plurality of optical lenses configured to homogenize and converge the laser light beam. Alternatively, the laser light source 2 can be a non-three-color light source, i.e., a single-color light source or a two-color light source. The single-color light source can include a blue laser assembly configured to excite a phosphor to generate two other primary colors of light (e.g., red and green) or more than two colors of light. The two-color light source can include a blue laser assembly and a red laser assembly, and the blue laser assembly is configured to excite a phosphor to generate green light (or other color light).

[0048] For example, the optical engine system 1 can include a plurality of lens groups, such as a total internal reflection (TIR) prism and a reverse total internal reflection (RTIR) mirror, configured to form an illumination optical path such that the illumination light beam can be incident on a core device in the optical engine system 1, i.e., a light valve. The light valve is configured to modulate the light beam and cause the modulated projection light beam to be incident on a lens group of the lens 3 for imaging. For example, the light valve can be a digital micromirror device (DMD). Alternatively, the light valve can be a liquid crystal on silicon (LCOS).

[0049] For example, the lens 3 can be an ultra-short-focus projection lens (as shown in FIG. 3 or FIG. 7), which generally includes a refractive lens group and a reflective lens group, and is configured to receive the projection light beam emitted by the light modulation system 1 after modulation to form an image. The ultra-short-focus projection device can achieve a small projection ratio (the projection ratio is the ratio of the vertical distance from the center of the light exit surface of the lens 3 to the plane on which the projection screen is located to the width of the display area on the projection screen, wherein the width of the display area refers to the size of the display area along the horizontal direction), such as less than or equal to 0.3, and of course other values are also possible. Therefore, when the laser projection device 100 projects an image, it can be closer to the projection screen to reduce the overall space occupied by the projection display system; or the lens 3 can also be a long-focus lens (as shown in FIG. 1 or FIG. 2), which is relatively easy to design and has a low cost.

[0050] In some embodiments, the laser light source 2 can include a beam shaper, a light homogenization device, and a first light valve. The beam shaper is configured to receive the illumination light beam emitted by the light source and perform shaping processing thereon. The light homogenization device is disposed in the light path of the illumination light beam to perform light homogenization and speckle elimination. The light beam emitted by the light homogenization device is modulated in the first light valve to obtain a projection light beam.

[0051] It can be understood that the beam shaper can be configured according to the requirements of different projection devices, such as the need to change the direction of the light beam, such as transmission, reflection, or change the size of the light spot, etc. The beam shaper can include lenses, mirrors, beam splitters, etc. The structure of the beam shaper can be different according to different requirements, which is not specifically limited here.

[0052] In some embodiments, a beam shaper can be further added to the rear side of the first light valve to further shape the light emitted by the first light valve.

[0053] In some embodiments, the light homogenization device includes a light homogenization element, which can include a diffusion wheel or a small-volume light homogenization structure, etc. For example, a diffusion sheet is used as the light homogenization element, which is not specifically limited here.

[0054] In an embodiment, the light homogenization element in the light homogenization device is a movable diffusion sheet. The light homogenization device can include a coil. The coil can be powered by an external drive of the light homogenization device, so that an electric current exists in the coil, thereby generating a magnetic field in the coil, and the light homogenization device operates to perform light homogenization and speckle elimination.

[0055] FIG. 3 is a three-dimensional schematic diagram of part of the structure of a laser projection device according to another embodiment of the present application. As shown in FIG. 3, the laser projection device includes a laser light source 2, a light modulation system 1, and a lens 3.

[0056] The laser light source 2, the optical engine system 1 and the lens 3 can be respectively wrapped by corresponding housings. The housings corresponding to the laser light source 2, the optical engine system 1 and the lens 3 can support the corresponding optical components and make the optical components meet certain sealing or air-tightness requirements.

[0057] In some embodiments, the arrangement direction of the laser light source 2 and the optical engine system 1 is substantially perpendicular to the arrangement direction of the optical engine system 1 and the lens 3, that is, in the laser projection device, the emission direction of the projection light beam (for example, parallel to the N direction) is substantially perpendicular to the emission direction of the illumination light beam (for example, parallel to the M direction). This connection structure can on the one hand adapt to the optical path characteristics of the reflective light valve in the optical engine system 1, and on the other hand, it is also beneficial to shorten the length of the optical path in one direction, so that more space can be arranged for the components of the laser projection device.

[0058] FIG. 4 is a circuit control schematic diagram of a laser projection device according to an embodiment of the present application. As shown in FIG. 4, in some embodiments, the laser projection device includes a power board 4, a display board 5, a TV board 7, a light driving circuit 6, a laser light source 2 and a light homogenization control unit 8. The laser light source 2 includes at least one laser 25 (for example, a red laser, a blue laser and a green laser) and a light homogenization device 22.

[0059] The power board 4 is connected with the display board 5 and the TV board 7 respectively, and can be used to supply power to each device or partial module on the display board 5 and the TV board 7. The TV board 7 is mainly used for decoding external audio and video signals and outputting a video image signal to the display board. The display board 5 can be provided with a Field Programmable Gate Array (FPGA) and an algorithm processing module, which are used to process the input video image signal. The display board 5 can be provided with a display control component connected with the algorithm processing module, which is used to receive the processed video image processing signal data as image data to be displayed. The display board 5 can generate an initial driving signal for driving the laser 25 and an image display driving signal for driving the light modulation device.

[0060] After the display board 5 receives the video image signal, the display board 5 can further process the video image signal (for example, geometric correction processing) to generate a driving signal for driving the laser 25 to emit light. The driving signal can include a dimming signal.

[0061] The dimming signal can include an analog dimming (Adim) signal and a pulse width modulation (Pwm) signal. The Pwm signal is used to control the presence or absence of the driving current transmitted to the laser 25, and the Adim signal in the dimming signal is used to control the current value of the driving current.

[0062] The light driving circuit 6 can also be referred to as a laser driving circuit, which can be a DC-DC conversion circuit, such as a voltage boosting circuit or a voltage reducing circuit. The light driving circuit 6 is configured to receive a dimming signal and a power input voltage from the power board 4, and convert the input power input voltage into a power output voltage based on the dimming signal, and output a driving current to the laser 25.

[0063] The laser 25 emits light under the driving of the driving current, and each laser 25 can include a plurality of laser light emitting chips.

[0064] The number of light driving circuits 6 is the same as the number of lasers 25, and each light driving circuit 6 corresponds to one laser 25. The lasers 25 of different colors can emit red light, green light, or blue light, respectively, under the driving of the driving current. The white light can be obtained after the light of the three colors is combined and homogenized.

[0065] FIG. 5 is a structural schematic diagram of a projection system according to an embodiment of the present application. As shown in FIG. 5, the projection system includes a laser projection device 100 and a projection screen 200, and the laser projection device 100 can project an image to be projected in the form of a light beam onto the projection screen 200. For example, the laser projection device 100 can be an ultra-short focus projection device.

[0066] FIG. 6 is a structural schematic diagram of a laser light source according to another embodiment of the present application, and FIG. 7 is a structural top view of the laser light source according to another embodiment of the present application. As shown in FIGS. 6 and 7, in some embodiments, the laser light source 2 includes a laser 25, a first reflector 26, and an adjusting assembly, and the laser 25 is configured to provide an illumination light beam. The laser 25 can include a red laser 251, a blue laser 252, and a green laser 253. The three kinds of lasers 25 can be integrated side by side, for example, the laser 25 can be an MCL three-color laser, and a plurality of light emitting chips are packaged on a substrate to form a surface light source output. Alternatively, the three kinds of lasers 25 can be separately arranged, for example, the blue laser 252 and the green laser 253 can be located in the same plane, and the red laser 251 can be arranged perpendicularly to the blue laser 252 and the green laser 253. Both arrangements can be used. Compared with a single-color laser light source 2 and a double-color laser light source 2, the three kinds of lasers 25 are used in the present example, and a wavelength conversion component such as a fluorescent wheel is not needed to generate fluorescent light, and the corresponding driving and heat dissipation components are also omitted, thereby simplifying the optical path inside the laser light source 2, greatly reducing the structure and volume of the laser light source 2, and thus greatly reducing the structure and volume of the laser projection device as a whole, and enhancing the portability of the laser projection device.

[0067] In order to change the propagation direction of the light beam emitted by the laser 25, so as to make the structure of the laser light source 2 more compact, the first mirror 26 is arranged on the side where the light emitting surface of the laser 25 is located, and is used to reflect the light beam from the laser 25 to the light emitting side of the laser light source 2.

[0068] The adjusting assembly is arranged on the side of the first mirror 26 away from the laser 25. The first mirror 26 is mounted on the adjusting assembly, and the adjusting assembly is used to adjust at least one of the distance H and the included angle a between the first mirror 26 and the light emitting surface of the laser 25.

[0069] Through the above arrangement, in the above adjustment process, the incident angle and the shape of the light spot of the light beam reflected by the first mirror 26 on the other optical devices (such as the fly-eye lens group 27) on the light beam transmission path (optical path) can be made to be consistent with the theoretical design as much as possible, and then the light beam emitted from the light emitting side of the laser light source 2 can be made to be incident on the theoretical design position of the optical devices (such as TIR) in the light engine according to the theoretical design direction as much as possible and form a light spot with a theoretical design shape, so as to ensure that the optical devices in the light engine receive the maximum optical power of the light beam emitted from the laser light source 2, thereby effectively ensuring the brightness of the laser projection device as a whole.

[0070] Since the laser itself has strong coherence, in order to improve the speckle problem caused by laser projection, a speckle elimination component can also be arranged in the laser light source 2 to perform uniform light processing on the light beam. As shown in FIGS. 8 and 9, in some embodiments, the laser light source 2 further includes a uniform light device and the fly-eye lens group 27. The uniform light device is located on the transmission path of the light beam reflected by the first mirror 26, and is used to transmit the light beam reflected by the first mirror 26 and perform uniform light processing on the light beam.

[0071] In some embodiments, the uniform light device can be a moving diffusion sheet, and the light entrance surface of the diffusion sheet is provided with a scattering microstructure, or the light entrance surface and the light exit surface of the diffusion sheet are both provided with a scattering microstructure. After the light beam passes through the moving diffusion sheet, the divergence angle of the light beam can be increased, thereby improving the speckle phenomenon and effectively improving the brightness uniformity and color uniformity of the light beam.

[0072] In order to ensure the imaging effect of the three-color laser light beam, the light beams emitted by the three-color laser 25 need to be combined into a white light beam first, and then transmitted along the transmission path of the light beam. As shown in FIGS. 6 and 7, in some embodiments, the laser 25 includes a red laser 251, a blue laser 252 and a green laser 253 arranged side by side in sequence, which are respectively used to emit red light beams, blue light beams and green light beams. The laser 25 can be the aforementioned MCL three-color laser 25.

[0073] Based on this, the laser light source 2 further comprises a second mirror 28 and a light combiner 29 which are parallel to each other, the second mirror 28 is located on the side where the light emitting surface of the red laser 251 is located, and the light combiner 29 is located on the side where the light emitting surfaces of the blue laser 252 and the green laser 253 are located. The red light beam emitted by the red laser 251 is reflected by the second mirror 28 to the light combiner 29 and transmitted through the light combiner 29, and the blue light beam emitted by the blue laser 252 and the green light beam emitted by the green laser 253 are reflected by the light combiner 29. The red light beam transmitted by the light combiner 29 and the blue light beam and the green light beam reflected by the light combiner 29 are combined and then incident on the first mirror 26. In this way, the three-color light beams emitted by the laser light source 2 are combined to form white light and then transmitted along the transmission path of the light beams, thereby ensuring the projection display effect of the laser projection device.

[0074] FIG. 8 is a structural schematic diagram of a laser according to an embodiment of the present application. As shown in FIG. 8, the laser 25 can further comprise a mounting substrate 254, and the red laser 251, the blue laser 252 and the green laser 253 can be integrated on the mounting substrate 254 in two groups, wherein the red laser 251 is a group alone, and the blue laser 252 and the green laser 253 are another group.

[0075] FIG. 9 is a partial structural schematic diagram of a laser light source according to an embodiment of the present application. As shown in FIG. 9, in some embodiments, the laser light source 2 comprises a light homogenizing device 22 and a driving module 24, and the driving module 24 is configured to drive the light homogenizing device 22 to move, thereby realizing light homogenization processing of the laser light beam.

[0076] The light homogenizing device 22 comprises at least one coil 220 and a light homogenizing element 231, and the driving module 24 is connected to the at least one coil 220 and configured to send an energizing signal to the at least one coil 220 to energize the at least one coil 220, and the light homogenizing element 231 moves along an elliptical trajectory under the magnetic force generated after the at least one coil 220 is energized.

[0077] In this embodiment, the driving module 24 is connected to the at least one coil 220 and can send an energizing signal to the at least one coil 220 to energize the coil 220, and the light homogenizing element 231 moves under the magnetic force generated after the at least one coil 220 is energized. The movement trajectory of the light homogenizing element 231 can be elliptical, which can enable the light homogenizing element 231 to achieve better light homogenization and speckle elimination effects. At the same time, the structure of the light homogenizing device 22 is simple and does not require complex mechanical structures, which is conducive to reducing the size of the light homogenizing device 22 and the laser light source 2, and is conducive to realizing the miniaturization and micro-miniaturization development of the laser projection device.

[0078] The working principle of the light homogenizing piece 231 is to scatter the illumination light beam irradiated on the light homogenizing piece 231 by using the uneven structure thereon, so that the illumination light beam becomes a plurality of sub-beams propagating in different directions, thereby making the light rays more widely distributed in space.

[0079] When the light homogenizing piece 231 moves, the light homogenizing piece 231 can provide a plurality of different random phase patterns in a unit time. The illumination light beam experiences different phase modulations at different times, so that the light of different phase states superimposes on each other in the whole observation time, the maximum and minimum of interference are averaged, the speckle and other uneven phenomena are effectively suppressed, and the light intensity distribution is more uniform, thereby increasing the light homogenizing effect. During the movement of the light homogenizing piece 231, the position and angle of the illumination light beam incident on the light homogenizing piece 231 change constantly, and the angular distribution range of the scattered light rays is further expanded. In the case that the light intensity in some areas is originally weak or strong, more light rays of different angles are supplemented to these areas as the scattering angle changes constantly, so that the spatial distribution of light is more uniform, and the light homogenizing effect is improved.

[0080] In addition, due to the time integration effect of the human eye on light. When the light homogenizing piece 231 moves, the different light homogenizing states generated by the light homogenizing piece 231 change rapidly in time, and the human eye cannot distinguish the instantaneous light intensity change, but averages the light intensity in a period of time. In this way, due to the rapid change of the light intensity in different positions and times caused by the movement of the light homogenizing piece 231, the light intensity distribution ultimately presented is more uniform, and the visual effect or imaging effect of the light homogenizing is enhanced.

[0081] On this basis, the movement trajectory of the light homogenizing piece 231 is configured as an elliptical shape. On the one hand, the elliptical trajectory can ensure that the light homogenizing piece 231 changes the phase patterns in the transverse and longitudinal directions at the same time in a unit time, and has better light homogenizing and speckle suppressing effects compared with linear displacement. On the other hand, the elliptical trajectory has good smoothness and cycle characteristics, and the light homogenizing piece 231 is more easily to realize uniform and stable driving control and movement effect when moving along the elliptical trajectory. In addition, when the light homogenizing piece 231 moves along the elliptical trajectory, the change frequency is low, and there is no problem of sudden stop and sudden turn, which is conducive to reducing the control difficulty and can reduce the noise generated by the moving member during the movement.

[0082] In some embodiments, the laser light source 2 comprises a light homogenizing device 22 and a driving module 24, the driving module 24 is used to drive the light homogenizing device 22 to move, so as to realize the light homogenizing processing of the laser light beam.

[0083] The light homogenizing device 22 comprises at least one coil 220 and a light homogenizing element 231; the driving module 24 is connected to the at least one coil 220 and is configured to send a power-on signal to the at least one coil 220 to cause the at least one coil 220 to be powered on, and the light homogenizing element 231 moves along a circular track under the magnetic force generated by the at least one coil 220 after the at least one coil 220 is powered on.

[0084] In this embodiment, the movement track of the light homogenizing element 231 can be a circle, which can enable the light homogenizing element 231 to achieve better light homogenizing and speckle eliminating effects. The working principle of the light homogenizing element 231 moving along the circular track is similar to that of moving along the elliptical track, which will not be described herein again.

[0085] As shown in FIG. 9, in some embodiments, the coil 220 comprises a first coil 221 and a second coil 222.

[0086] The driving module 24 is connected to the first coil 221 and the second coil 222, and is configured to send a first power-on signal to the first coil 221 to cause the first coil 221 to be powered on, and send a second power-on signal to the second coil 222 to cause the second coil 222 to be powered on, and the light homogenizing element 231 moves along an elliptical track under the magnetic force generated by the first coil 221 and / or the second coil 222 after the first coil 221 and / or the second coil 222 is powered on.

[0087] In some embodiments, the light homogenizing element 231 moves along a circular track under the magnetic force generated by the first coil 221 and / or the second coil 222 after the first coil 221 and / or the second coil 222 is powered on.

[0088] In the above embodiments, the driving module 24 is connected to the first coil 221 and the second coil 222, sends a first power-on signal to the first coil 221 to cause the first coil 221 to be powered on, and sends a second power-on signal to the second coil 222 to cause the second coil 222 to be powered on, and the light homogenizing element 231 moves along a circular or elliptical track under the magnetic force generated by the first coil 221 and / or the second coil 222 after the first coil 221 and / or the second coil 222 is powered on, to achieve better light homogenizing and speckle eliminating effects.

[0089] As shown in FIG. 9, in some embodiments, the magnetic force generated by the first coil 221 after being powered on and the magnetic force generated by the second coil 222 after being powered on are arranged at an angle greater than zero and less than 180°.

[0090] Through the above arrangement, when the first coil 221 and the second coil 222 generate magnetic forces respectively, since the directions of the magnetic forces have an angle greater than zero and less than 180°, a resultant force in any direction can be formed, so that the light homogenizing element 231 can move towards any direction, and further move along a circular or elliptical track.

[0091] In some embodiments, the magnetic force generated by the energization of the first coil 221 and the magnetic force generated by the energization of the second coil 222 periodically change in direction and magnitude, so that the light homogenizing member 231 can also move along a specific trajectory under the action of the two magnetic forces, for example, circular or elliptical trajectory.

[0092] FIG. 10 is a structural schematic diagram of a light homogenizing device according to an embodiment of the present application, and FIG. 11 is a structural schematic diagram of a light homogenizing device according to another embodiment of the present application.

[0093] As shown in FIGS. 10 and 11, in some embodiments, the light homogenizing member 231 is rectangular, the first coil 221 is located at one side of the long side of the rectangle, and the second coil 222 is located at one side of the wide side of the rectangle. The magnetic force generated by the energization of the first coil 221 is perpendicular to the direction of the long side (or described as parallel to the direction of the wide side), and the magnetic force generated by the energization of the second coil 222 is perpendicular to the direction of the wide side (or described as parallel to the direction of the long side). The resultant force of the magnetic forces generated by the first coil 221 and the second coil 222 can drive the light homogenizing member 231 to move towards the direction between the long side and the wide side.

[0094] FIG. 12 is a structural schematic diagram of a circuit board according to an embodiment of the present application. As shown in FIG. 9 or FIG. 12, in some embodiments, the magnetic force generated by the energization of the first coil 221 is distributed along a first coordinate axis, and the magnetic force generated by the energization of the second coil 222 is distributed along a second coordinate axis. The first coordinate axis and the second coordinate axis are perpendicular to each other, and the planes determined by the first coordinate axis and the second coordinate axis are respectively perpendicular to the light path direction of the light homogenizing member 231.

[0095] Through the above arrangement, the magnetic forces generated by the first coil 221 and the second coil 222 can achieve better resultant force, and improve the stability of the movement of the light homogenizing member 231 along the circular or elliptical trajectory. In addition, when the directions of the magnetic forces are perpendicular, the movement control of the light homogenizing member 231 is less difficult, which is conducive to reducing the control cost of the light homogenizing device 22.

[0096] In some embodiments, the first coordinate axis is perpendicular to the direction of the long side (or described as parallel to the direction of the wide side), and the second coordinate axis is perpendicular to the direction of the wide side (or described as parallel to the direction of the long side).

[0097] As shown in FIG. 9, in some embodiments, the laser light source 2 further includes a driving module 24 connected to the light homogenizing device 22. The light homogenizing device 22 includes the first coil 221 and the second coil 222. The first coil 221 and the second coil 222 in FIG. 9 are only simple illustrations, and should not be regarded as a limitation on the shape of the first coil 221 and the second coil 222.

[0098] As shown in FIG. 10 and FIG. 11, in some embodiments, the light homogenizing device 22 includes a circuit board 227, and the first coil 221 and the second coil 222 are welded on corresponding pads of the circuit board 227.

[0099] In this embodiment, the first coil 221 and the second coil 222 each include two ends, one end is regarded as a positive terminal, and the other end is regarded as a negative terminal. The positive terminal and the negative terminal of the first coil 221 are welded on corresponding pads of the circuit board, and the positive terminal and the negative terminal of the second coil 222 are welded on corresponding pads of the circuit board.

[0100] The two ends of the first coil 221 and the second coil 222 are respectively connected with the driving module 24 and are driven by the driving module 24.

[0101] In some embodiments, the light homogenizing device 22 further includes a light homogenizing piece 231, which can include a motion diffusion sheet or the like structure. When the first coil 221 and / or the second coil 222 of the light homogenizing device 22 is driven by the driving module 24, the magnetic force generated by the first coil 221 and / or the second coil 222 can make the light homogenizing piece 231 move, thereby realizing the light homogenizing and speckle eliminating functions in the laser projection device.

[0102] When the first coil 221 and / or the second coil 222 is energized, there is positive and negative alternating current, such as trapezoidal wave alternating current or sinusoidal wave alternating current, in the first coil 221 and / or the second coil 222. The positive and negative alternating current drives the light homogenizing piece 231 to move as a driving current.

[0103] In this embodiment, the driving module 24 is connected with the first coil 221 and the second coil 222, sends a first energizing signal to the first coil 221 to make the first coil 221 energized, sends a second energizing signal to the second coil 222 to make the second coil 222 energized, and the light homogenizing piece 231 moves under the magnetic force generated by the first coil 221 and / or the second coil 222 after the first coil 221 and / or the second coil 222 is energized.

[0104] In some embodiments, the phase difference between the first energizing signal and the second energizing signal is one-fourth of a period. In this way, the movement track of the light homogenizing piece 231 is circular or elliptical. The movement track of the light homogenizing piece 231 close to circular or elliptical can make the light homogenizing piece 231 realize better light homogenizing and speckle eliminating effects.

[0105] In some embodiments, the positive terminal of the two ports of the first coil 221 is regarded as a first positive terminal, and the negative terminal of the two ports of the first coil 221 is regarded as a first negative terminal. The first positive terminal receives the first energizing signal in the first half period, and the first negative terminal receives the first energizing signal in the second half period.

[0106] The positive terminal of the two ports of the second coil 222 is taken as a second positive terminal, and the negative terminal of the two ports of the second coil 222 is taken as a second negative terminal, the second positive terminal receives the second energizing signal in the first half cycle, and the second negative terminal receives the second energizing signal in the second half cycle.

[0107] In the embodiment, one cycle is one rotation of the light homogenizing element, in one cycle, the first positive terminal receives the first energizing signal in the first half cycle, and the first negative terminal receives the first energizing signal in the second half cycle.

[0108] It can be understood that the first energizing signal is a digital signal, in the first half cycle, the first positive terminal receives the first energizing signal, and the first negative terminal receives the energizing signal with a duty cycle of zero, that is, the duty cycle of the digital signal waveform emitted by the driving module received by the first negative terminal in the first half cycle is zero.

[0109] In the second half cycle, the first negative terminal receives the first energizing signal, and the first positive terminal receives the energizing signal with a duty cycle of zero, so that in one cycle, the two ends of the first coil 221 receive the first energizing signal in different half cycles, and the other end receives the energizing signal with a duty cycle of zero, thereby changing the current direction in the first coil 221, in the first half cycle, the current flows from the first positive terminal to the first negative terminal, and in the second half cycle, the current flows from the first negative terminal to the first positive terminal, the first energizing signal applied to the two ends of the first coil 221 in different half cycles can be integrated to obtain the positive and negative alternating current received by the first coil 221 in one cycle, that is, by applying the first energizing signal with a duty cycle of zero to the two ends of the first coil 221 in different half cycles, the analog signal received by the first coil 221 in one cycle can be obtained, that is, the analog signal is positive and negative alternating current, so that the positive and negative alternating current in the first coil 221 can be used as a driving current to drive the light homogenizing element to move.

[0110] The energizing signal with a duty cycle of zero is also a digital signal, the digital signal waveform corresponding to the first energizing signal is determined by the duty cycle, and the digital signal waveform of the first energizing signal can determine the analog signal waveform of the alternating current received by the first coil 221 in one cycle.

[0111] The second energizing signal of the second coil 222 is a digital signal. In the first half cycle, the second positive terminal receives the second energizing signal, and the second negative terminal receives an energizing signal with a duty cycle of zero, i.e., the duty cycle of the digital signal waveform of the energizing signal received by the second negative terminal in the first half cycle is zero. In the second half cycle, the second negative terminal receives the second energizing signal, and the second positive terminal receives an energizing signal with a duty cycle of zero. The second coil 222 can receive an alternating current with positive and negative changes in one cycle. The digital signal waveform of the second energizing signal determines the waveform of the analog signal received by the second coil 222, i.e., the analog signal is an alternating current with positive and negative changes. Thus, the alternating current with positive and negative changes in the second coil 222 can drive the light uniforming member to move.

[0112] In this embodiment, the phase difference between the first energizing signal and the second energizing signal is one quarter of a cycle. The phase difference between the first energizing signal received by the first positive terminal and the second energizing signal received by the second positive terminal is one quarter of a cycle. The phase difference between the first energizing signal received by the first negative terminal and the second energizing signal received by the second negative terminal is one quarter of a cycle.

[0113] The phase difference between the energizing signal with a duty cycle of zero received by the first negative terminal and the energizing signal with a duty cycle of zero received by the second negative terminal is one quarter of a cycle. The phase difference between the energizing signal with a duty cycle of zero received by the first positive terminal and the energizing signal with a duty cycle of zero received by the second positive terminal is one quarter of a cycle.

[0114] In some embodiments, the first coil 221 and the second coil 222 can obtain corresponding analog signals by applying the first energizing signal and the second energizing signal to the two ends of the first coil 221 and the second coil 222 in different half cycles. The duty cycles of the first energizing signal and the second energizing signal are different, and the waveforms of the corresponding analog signals are different. In this embodiment, the waveform of the analog signal can be a sine wave or a trapezoidal wave or close to a sine wave or close to a trapezoidal wave. Thus, the movement trajectory of the light uniforming member driven by the first coil 221 and the second coil 222 under the analog signal with the waveform can be circular or elliptical or close to circular or close to elliptical. In this way, the light uniforming member can achieve better light uniformity and spot elimination effect.

[0115] In this embodiment, the duty cycles of the first energizing signal and the second energizing signal can determine the waveform of the analog signal. Different duty cycles can be set to obtain different waveforms of the analog signal. Each small cycle can be set with a different duty cycle to obtain the required waveform of the analog signal.

[0116] The analog signal can be an analog voltage signal or an analog current signal. At a certain temperature, the resistance of the first coil 221 or the second coil 222 is considered to be constant. Therefore, the waveform of the analog voltage signal and the waveform of the analog current signal have the same shape (the values can be different).

[0117] For the first coil 221, the first positive terminal is applied with the first energizing signal in the first half cycle, and the first negative terminal is applied with the energizing signal with a duty cycle of zero. In the second half cycle, the first negative terminal is applied with the first energizing signal, and the first positive terminal is applied with the energizing signal with a duty cycle of zero. In one cycle, the digital voltage obtained by the first coil 221 is the energizing signal received by the first positive terminal minus the energizing signal received by the first negative terminal. The energizing signal received by the first positive terminal is PWM11, and the energizing signal received by the first negative terminal is PWM12. If the energizing signal is a digital voltage signal, the voltage of the first coil 221 in one cycle is PWM11-PWM12. Therefore, the analog voltage signal obtained by the first coil 221 in one cycle can be obtained through PWM11-PWM12.

[0118] In some embodiments, the waveform of the analog signal is a sine wave. By dividing one cycle into as many small cycles as possible, the first energizing signal and the second energizing signal are set with corresponding duty cycles in each small cycle, so that the waveform of the analog signal obtained by the first energizing signal acting on the first coil 221 or the second energizing signal acting on the second coil 222 is a sine wave or close to a sine wave.

[0119] In some embodiments, the analog signal is a trapezoidal wave. One cycle is divided into as many small cycles as possible. For the first half cycle of the first energizing signal received by the first positive terminal. In some embodiments, the first half cycle of the first energizing signal received by the first positive terminal is divided into three stages in time sequence. In the first stage, the duty cycle of the first energizing signal received by the first positive terminal increases. In the middle stage, the duty cycle of the first energizing signal received by the first positive terminal remains unchanged. In the last stage, the duty cycle of the first energizing signal received by the first positive terminal decreases.

[0120] That is, for a plurality of small periods in the previous stage, the duty cycle of the first energizing signal is increased, for a plurality of small periods in the middle stage, the duty cycle of the first energizing signal received by the first positive terminal is unchanged, and for a plurality of small periods in the subsequent stage, the duty cycle of the first energizing signal is decreased. The duty cycle in the middle stage is the largest in the first energizing signal. In this way, by using different duty cycles of the first energizing signal in the three stages to act on the first coil 221, the analog signal obtained by the first coil 221 is a trapezoidal wave. For reference, FIG. 13 shows a waveform diagram of the analog signal obtained by the first coil 221, or FIG. 14 shows a waveform diagram of the analog signal obtained by the first coil 221. The trapezoidal wave shown in FIG. 13 and FIG. 14 is obtained by dividing the first half cycle into four parts in order, the first part corresponds to the first stage, the duty cycle is increased, the middle two parts correspond to the middle stage, the duty cycle is unchanged and the largest, and the last part corresponds to the subsequent stage, the duty cycle is decreased. In other embodiments, the 3 stages can also be unevenly divided to obtain different shapes of trapezoidal waves, which are not limited here. The same applies to the second half cycle, which will not be repeated here.

[0121] As can be seen from FIG. 13, in the first half cycle, PWM11-PWM12 is positive, and in the second half cycle, PWM11-PWM12 is negative. In this way, the first energizing signal acts on the first coil 211, so that the first coil 211 receives alternating current with positive and negative changes to drive the light uniforming device to rotate.

[0122] As shown in FIG. 10 and FIG. 11, in some embodiments, the light uniforming device 22 includes a support base 223, which is a non-conductive structure for supporting the light uniforming device 22.

[0123] The light uniforming device 22 further includes a moving plate 224 fixed to the support base 223 by an elastic device 225.

[0124] The material of the moving plate 224 is not limited and can be plastic or metal sheet, etc.

[0125] The elastic device 225 can be a material with elasticity, such as a spring, a wire, or a spring, etc. The elastic device 325 can be connected to the support base 223 and the moving plate 224 by pasting or screwing.

[0126] As shown in FIG. 11, in some embodiments, the light uniforming device 22 further includes a magnetic device 226 fixed to the moving plate 224.

[0127] In some embodiments, the magnetic device 226 is pasted on the moving plate 224, so that the moving plate 224 has a certain gap relative to the support base 223 to support the movement space of the moving plate 224 relative to the support base 223.

[0128] Figure 11 shows the exploded structure and the assembled structure of the light homogenizing device 22. As shown in Figure 11, in some embodiments, the light homogenizing device 22 comprises a support base 223, a moving plate 224, an elastic device 225 and a magnetic device 226, wherein the moving plate 224 comprises a first moving plate 2241 and a second moving plate 2242, the elastic device 225 comprises a first elastic member 2251 and a second elastic member 2252, and the magnetic device 226 comprises a first magnetic member 2261 and a second magnetic member 2262.

[0129] The first moving plate 2241 and the second moving plate 2242 are arranged in parallel and spaced apart from the support base 223, and the second moving plate 2242 is located between the first moving plate 2241 and the support base 223, and the light homogenizing member is located on the second moving plate 2242. The second moving plate 2242 is movably connected to the first moving plate 2241 by the second elastic member 2252, and the first moving plate 2241 is movably connected to the support base 223 by the first elastic member 2251. The second moving plate 2242 can drive the light homogenizing member to move relative to the support base 223 in a first direction (for example, the X-axis direction), and the second moving plate 2242+light homogenizing member can drive the second moving plate 2242 to move relative to the support base 223 in a second direction (for example, the Y-axis direction).

[0130] Moreover, the first magnetic member 2261 is arranged on the first moving plate 2241, and the second magnetic member 2262 is arranged on the second moving plate 2242.

[0131] The coil 220 is arranged on the support base 223, and the coil 220 comprises a first coil 221 and a second coil 222, wherein the first coil 221 is located opposite to the first magnetic member 2261 with a spacing, and the second coil 222 is located opposite to the second magnetic member 2262 with a spacing. When the first coil 221 is supplied with current, the electromagnetic field generated by the first coil 221 interacts with the magnetic field of the first magnetic member 2261, thereby generating a force to push the first moving plate 2241. When the second coil 222 is supplied with current, the electromagnetic field generated by the second coil 222 interacts with the magnetic field of the second magnetic member 2262, thereby generating a force to push the second moving plate 2242.

[0132] When the light homogenizing device 22 further comprises a circuit board 227, the circuit board 227 is located on the support base 223, and the first coil 221 and the second coil 222 can be formed by winding in multiple layers of the circuit board 227 by wiring, without the need for the operation of pasting the single coil 220 and welding the wire ends at both ends of the coil 220, thereby greatly reducing the production cost and improving the reliability of the light homogenizing device 22. In addition, the width of the coil 220 formed by the wiring of the circuit board 227 can be adjusted, and the heat dissipation is better.

[0133] In the embodiment, corresponding to the first coil 221 and the second coil 222, the number of the magnetic devices 226 is 2, and in the horizontal plane where the motion plate 224 is located, one magnetic device 226 is placed along the first direction, and one magnetic device 226 is placed along the second direction, that is, the extending directions of the two magnetic devices 226 are orthogonal in the plane where the motion plate 224 is located. The plane where the motion plate 224 is located is regarded as a horizontal plane, and the horizontal plane has two-dimensional coordinate axes. The first direction can be regarded as the X-axis direction, and the second direction is the Y-axis direction.

[0134] The first coil 221 and the second coil 222 are both fixed on the support base 223. The first coil 221 and the second coil 222 can be fixed by pasting, and the first coil 221 is placed along the first direction, and the second coil 222 is placed along the second direction, that is, the extending directions of the first coil 221 and the second coil 222 are orthogonal in the plane where the support base 223 is located.

[0135] The magnetic device 226 placed along the first direction is arranged above the first coil 221, and the magnetic device 226 placed along the second direction is arranged above the second coil 222, so that the magnetic device 226 is not positionally opposite to the first coil 221 and the second coil 222, respectively.

[0136] In the embodiment, after the first coil 221 is powered on and / or the second coil 222 is powered on, a magnetic field is generated around the first coil 221 and / or the second coil 222. The magnetic field is similar to the magnetic field of a bar magnet. The magnetic device 226 is located in the magnetic field generated by the first coil 221 and / or the second coil 222, and then acts on the magnetic force obtained from the magnetic field, so that the magnetic device 226 moves relative to the first coil 221 and / or the second coil 222. The magnetic device 226 drives the motion plate 224 to move relative to the support base 223. The motion plate 224 drives the light homogenizing member 231 to move. The analog signal in the first coil 221 and / or the second coil 222 is a trapezoidal wave or a sine wave or other shaped wave. The movement trajectory of the light homogenizing member 231 driven by the analog signal is a circle or an ellipse or close to a circle or close to an ellipse. In the movement trajectory of the light homogenizing member 231, better light homogenization and spot elimination effects can be achieved.

[0137] FIG. 13 is a waveform diagram of an analog signal obtained by the first coil 221 according to an embodiment of the present application. In FIG. 13, the dashed line is the waveform of the analog signal obtained by the first coil 221, and the solid line is the waveform of the difference between the first power-on signal applied to the first positive terminal of the first coil 221 and the first power-on signal applied to the first negative terminal of the first coil 221. The analog signal shown in FIG. 13 is a trapezoidal wave.

[0138] Fig. 14 is a waveform diagram of the analog signal obtained by the first coil 221 according to another embodiment of the present application, in which the dashed line is the waveform of the analog signal obtained by the first coil 221, and the solid line is the waveform of the difference between the first energizing signal applied to the first positive terminal of the first coil 221 and the first energizing signal applied to the first negative terminal of the first coil 221. The analog signal shown in Fig. 14 is a sine wave. The driving waveform of the sine wave helps to further reduce the driving noise, improve the driving accuracy of the first coil 221, and make the movement of the light uniforming member 231 smoother.

[0139] The driving waveform of the second coil 222 can also be a trapezoidal wave or a sine wave as shown in Figs. 13 and 14, and the driving mode of the first coil 221 is the same, which will not be described here.

[0140] In some embodiments, as shown in Fig. 11, the light uniforming device 22 can further include a circuit board 227, and the positive and negative terminals of the first coil 221 and the second coil 222 are welded to the corresponding pads of the circuit board 227. The positive and negative terminals of the first coil 221 and the second coil 222 are connected to the four energizing signal output connection ends in the driving module 24 through the circuit board 227, PCB wiring, sockets, and connecting wires. The energizing signal output connection ends can be pin structures.

[0141] In some embodiments, the support base 223 and the movement plate 224 can be hollow structures in the middle, so that light can pass through the hollow area in the middle, be light-uniformed by the moving light uniforming member 231, and achieve spot dispersion and color uniformity.

[0142] The present embodiment proposes a light uniforming device applied to a laser projection device, which can perform light uniforming and spot dispersion, and improve the quality of the projected image.

[0143] Fig. 12 is a structural schematic diagram of the light uniforming device according to another embodiment of the present application, which is a structural schematic diagram of the light uniforming device 22 when the light uniforming member 231 is a diffusion sheet. As shown in Fig. 12, the circuit board 227 in the present embodiment is further provided with a first socket 228, and the light uniforming device 22 can be connected to external devices through the first socket 228, such as the driving module 24. The movement of the light uniforming member 231 is driven by the signals input by the driving module 24, and light uniforming and spot dispersion are achieved.

[0144] In some embodiments, the circuit board 227 is further provided with a calibration unit 230. The light uniforming device can be regarded as a calibratable light uniforming device by using the calibration unit 230. The calibration unit 230 is provided with calibration parameters, and the running track and running mode of the light uniforming member 231 can be adjusted in real time according to the calibration parameters, so as to better achieve light uniforming and spot dispersion.

[0145] In some embodiments, the calibration unit 230 can be connected with the driving module 24 through the first socket 228, and the driving module 24 can acquire the calibration parameters in the calibration unit 230 to output the first power-on signal and the second power-on signal to control the operation of the light uniformization device 231.

[0146] In some embodiments, the driving module 24 can be directly connected with the calibration unit 230 through welding to access the calibration parameters.

[0147] As shown in FIG. 10, in some embodiments, the light uniformization device 22 further comprises a fixing device 229, and the elastic device 225 can connect the support base 223 and the moving plate 224 through the fixing device 229. The fixing device 229 can be a screw.

[0148] As shown in FIG. 11, in some embodiments, the first coil 221 and the second coil 222, and the magnetic device 226 corresponding to the first coil 221 and the magnetic device 226 corresponding to the second coil 222 are arranged inside the moving plate 224.

[0149] As shown in FIG. 10, the area indicated by A and the area indicated by B on the moving plate 224 are provided with coils (for example, the first coil 221 and the second coil 222) and magnetic devices 226. The area indicated by A on the moving plate 224 is provided with the first coil 221 and the magnetic device 226 opposite to the first coil 221, and the area indicated by B on the moving plate 224 is provided with the second coil 222 and the magnetic device 226 opposite to the second coil 222. The first coil 221 and the second coil 222 are welded on the circuit board 227.

[0150] As shown in FIG. 11, the light uniformization device shows the first coil 221 and the second coil 222, and shows the magnetic device 226 opposite to the first coil 221. The fixing device 229 can be a dispensing structure, that is, the elastic device 325 connects the support base 223 and the moving plate 224 through dispensing.

[0151] In some embodiments, as shown in FIG. 9, the driving module 24 includes 4 energizing signal output connections, i.e., a first energizing signal output connection 241, a second energizing signal output connection 242, a third energizing signal output connection 243 and a fourth energizing signal output connection 244. The first energizing signal output connection 241 and the second energizing signal output connection 242 are respectively connected to two ends of the first coil 221 for outputting a first energizing signal to the first coil 221. The third energizing signal output connection 243 and the fourth energizing signal output connection 244 are respectively connected to two ends of the second coil 222 for outputting a second energizing signal to the second coil 222. In this embodiment, the first energizing signal output connection 241 and the second energizing signal output connection 242 are respectively connected to a first positive terminal and a first negative terminal of the first coil 221. The third energizing signal output connection 243 and the fourth energizing signal output connection 244 are respectively connected to a second positive terminal and a second negative terminal of the second coil 222. The 4 energizing signal output connections can be in the form of pins.

[0152] It can be understood that, since the first energizing signal output connection 241 and the second energizing signal output connection 242 are respectively connected to the first positive terminal and the first negative terminal of the first coil 221, the first energizing signal output connection 241 and the second energizing signal output connection 242 can be controlled to output the first energizing signal to the first coil 221 at different time periods in a cycle, so as to change the direction of the current in the first coil 221. For example, the first energizing signal output connection 241 outputs the first energizing signal to the first coil 221, and the second energizing signal output connection 242 outputs an energizing signal with a duty ratio of zero to the first coil 221, so that the current in the first coil 221 flows from the terminal connected to the first energizing signal output connection 241 to the terminal connected to the second energizing signal output connection 242. Similarly, the second energizing signal output connection 242 outputs the first energizing signal to the first coil 221, and the first energizing signal output connection 241 outputs an energizing signal with a duty ratio of zero to the first coil 221, so that the current in the first coil 221 flows from the terminal connected to the second energizing signal output connection 242 to the terminal connected to the first energizing signal output connection 241.

[0153] Similarly, the third energizing signal output connection 243 and the fourth energizing signal output connection 244 can change the direction of the current in the second coil 222 by outputting the second energizing signal to the second coil 222. The specific manner can refer to the manner of changing the direction of the current in the first coil 221, which will not be described herein.

[0154] In some embodiments, the first coil 221 is energized based on a first energizing signal, and the second coil 222 is energized based on a second energizing signal, so that the light uniforming member moves under the magnetic force generated after the first coil 221 and / or the second coil 222 is energized.

[0155] In this embodiment, at a certain time point, the first coil 221 is energized, at which time the waveform of the analog signal in the second coil 222 has a phase difference with the waveform of the analog signal of the first coil 221, and the light uniforming member can move under the magnetic force generated after the first coil 221 and / or the second coil 222 is energized.

[0156] In this embodiment, by providing four energizing signal output connection ends in the driving module, each of the energizing signal output connection ends is connected to different ports of the first coil 221 and the second coil 222, so that the energizing signal is sent through the channel signal output connection end, the energizing of the first coil 221 and the second coil 222 can be controlled, and the direction of the current in the first coil 221 and the second coil 222 can be controlled, thereby changing the magnetic field in the first coil 221 and the second coil 222, so that the light uniforming member can run according to the required movement track, and the light uniforming and spot dissipation effects are realized.

[0157] In some embodiments, the driving module 24 includes a control unit and a driving unit, the control unit is connected with the driving unit, the driving unit receives the control signal sent by the control unit and amplifies the control signal to generate the first energizing signal and the second energizing signal.

[0158] It can be understood that the control signal is also a digital signal, and the waveform of the control signal is the same as that of the first energizing signal and the second energizing signal, but the amplitude is different, and the duty cycle of the control signal is the same as that of the first energizing signal and the second energizing signal, but the amplitude is different.

[0159] In this embodiment, the control unit can output a control signal, which can determine the waveform (here, the shape, not the amplitude) of the analog signal obtained by the first coil 221 or the second coil 222, but the control signal is not enough to drive the light uniforming member 231 to run. Therefore, the driving unit first amplifies the control signal output by the control unit to obtain the first energizing signal and the second energizing signal that can drive the light uniforming member 231 to run, so that the first energizing signal and the second energizing signal are applied to the corresponding coil. The coil receives positive and negative change trapezoidal wave alternating current or sinusoidal wave alternating current or alternating current with other waveforms, which is used as a driving current to drive the light uniforming member 231 to move. Of course, the waveform of the alternating current can also be other shapes, which is not specifically limited here.

[0160] In some embodiments, the control unit is provided with a control signal output connection end connected with a control signal receiving connection end of the driving unit, the driving unit receives the control signal sent by the control signal output connection end through the control signal receiving connection end, and amplifies the control signal to generate the first energizing signal and the second energizing signal. The control signal output connection end and the control signal receiving connection end can be pin structures respectively.

[0161] In the embodiment, the control signal is a digital signal, for example, a digital voltage signal, and the waveform of the digital voltage signal can be determined by the waveform of the alternating current acting on the first coil 221 or the second coil 222. In the embodiment, the control unit outputs a control signal, and the required movement track of the light homogenizing device is determined by the control signal. The required movement track of the light homogenizing device is determined by the waveform of the alternating current acting on the first coil 221 and the second coil 222, and the duty cycle of the output control signal can determine the size of the movement track. The light homogenizing effect of the light homogenizing device can be further improved by setting the movement track as a circle or an ellipse. When the waveform of the alternating current acting on the first coil 221 and the second coil 222 is a trapezoidal wave, the duty cycle of the digital signal in the constant duty cycle stage determines the size of the circle or the ellipse of the movement track, and the greater the duty cycle, the greater the movement amplitude. However, the control signal output by the control unit has no analog driving capability. Therefore, the digital signal needs to be amplified and processed in the driving unit to obtain the first energizing signal and the second energizing signal that can drive the first coil 221 and the second coil 222 circuit.

[0162] In some embodiments, the light homogenizing device can be divided into a calibratable light homogenizing device and a non-calibratable light homogenizing device. The calibratable light homogenizing device includes a calibration unit 230, which has a calibration function. The calibratable light homogenizing device can be applied to a laser projection device with high projection quality. The calibratable light homogenizing device can adjust parameters in real time to determine the operation mode of the light homogenizing device according to different light homogenizing requirements. In detail, the calibratable light homogenizing device can control the vibration of the light homogenizing device 231 according to the current waveform generated by the parameters in the calibration unit 230, so as to ensure the consistency of the movement track of the vibration, thereby ensuring good spot diffusion and light homogenizing effect. The non-calibratable light homogenizing device does not include the calibration unit 230 and has no calibration function. The non-calibratable light homogenizing device can only drive the vibration of the light homogenizing device according to the alternating current waveform generated by the preset parameters, and cannot calibrate the vibration of the light homogenizing device 231 in real time. The non-calibratable light homogenizing device can perform light homogenizing and spot diffusion, and the control method is simple and the cost is relatively low compared with the calibratable light homogenizing device.

[0163] In this embodiment, for the non-calibrable light uniformization device, the digital signal output by the control unit is a preset control signal; and for the calibrable light uniformization device, the calibration unit 230 therein is provided with the calibration parameters of the light uniformization device 231, the control unit is connected with the calibration unit 230, the control unit generates the control signal matched with the calibration parameters based on the calibration parameters read by the calibration unit 230, and the signal after the control signal passing through the driving unit is used as the driving waveform signal of the light uniformization device, i.e., the first power-on signal and the second power-on signal.

[0164] The calibration parameters can include duty ratio, working frequency and phase, through which the control unit can generate the corresponding control signal, so as to make the light uniformization device 231 move according to the movement track corresponding to the calibration parameters.

[0165] FIG. 12 is a structural schematic diagram of a circuit board according to an embodiment of the present application, which is a circuit board of a non-calibrable light uniformization device. As shown in FIG. 12, in some embodiments, the light uniformization device further includes a first socket 228, and the first positive terminal and the first negative terminal of the first coil 221 and the second positive terminal and the second negative terminal of the second coil 222 are connected to the corresponding connection terminals of the first socket 228. Specifically, the X+ and X- connection terminals are connected to the first positive terminal and the first negative terminal of the first coil 221 respectively, wherein the X+ is regarded as the positive electrode of the first coil 221, and the X- is regarded as the negative electrode of the first coil 221, and are connected to the 1 and 2 connection terminals of the first socket 228 respectively. The Y+ and Y- connection terminals are connected to the two ends of the second coil 222, wherein the Y+ is regarded as the positive electrode of the second coil 222 and is connected to the second positive terminal, and the Y- is regarded as the negative electrode of the second coil 222 and is connected to the second negative terminal, and are connected to the 3 and 4 connection terminals of the second socket respectively. In the first socket, the 5-10 connection terminals are connected to the NC connection terminals, which are empty pins and have no other purposes. In this way, the first power-on signal output connection terminal 241, the second power-on signal output connection terminal 242, the third power-on signal output connection terminal 243 and the fourth power-on signal output connection terminal 244 in the driving module 24 can be connected to the first coil 221 and the second coil 222 through the corresponding connection terminals of the first socket 228. The connection terminals of the first socket 228 can be pin structures respectively.

[0166] The first socket 228 can not be provided in the circuit board 227, and the power-on signal output connection terminals in the driving module 24 can be connected to the ports of the first coil 221 and the second coil 222 through welding on the circuit board.

[0167] Figure 15 is a schematic diagram of a circuit board according to an embodiment of the present application, and Figure 16 is a schematic diagram of a circuit board according to another embodiment of the present application, both of which are circuit boards of the calibratable light uniformization device. In some embodiments, the calibration unit 230 in the calibratable light uniformization device can be an EEPROM (Electrically Erasable Programmable read only memory) or an MCU (Microcontroller Unit).

[0168] As shown in Figure 15 or Figure 16, in some embodiments, the calibration unit 230 includes a first communication connection end, and the control unit includes a second communication connection end, the first communication connection end being connected to the second communication connection end, so that the control unit can access the calibration parameters in the calibration unit 230 through the second communication connection end and the first communication connection end, and generate corresponding control signals. The first communication connection end and the second communication connection end can each be a pin structure. The pin structure can achieve electrical connection between an electronic component and an external circuit, so that current can flow between the component and the circuit, thereby achieving functions such as signal transmission and power supply.

[0169] In the present embodiment, the first communication connection end and the second communication connection end can be connected by being soldered to the circuit board.

[0170] In some embodiments, the light uniformization device 22 further includes a first socket 228 provided with a first socket communication connection end, and the driving module 24 further includes a second socket provided with a second socket communication connection end. The first communication connection end and the first socket communication connection end can be connected by a wire, the second communication connection end and the second socket communication connection end can be connected by a wire, and the first socket communication connection end and the second socket communication connection end are connected, so that the first communication connection end and the second communication connection end are connected.

[0171] In Figure 15, the calibration unit 230 is an EEPROM, I2C_SCL and I2C_SDA are the first communication connection end, GND is a ground end, and VCC is a power supply connection end with a voltage of 3.3V (volts) to supply power to the circuit of the calibration unit 230. The serial numbers 9 and 10 of the first socket 228 in Figure 15 are the first socket communication connection end, and the four connection ends of the calibration unit 230 are connected to the four connection ends 5, 7, 9 and 10 of the first socket 228 one by one.

[0172] In FIG. 16, the calibration unit 230 is an MCU, RIGX and TRIGY are trigger connection terminals, TRIGX corresponds to the control signal of the first coil 221, and TRIGY corresponds to the signal in the second coil 222. When TRIGX is effective, the parameters of the first coil 221 such as phase, operating frequency, and duty cycle can be read through the communication connection terminal. When TRIGY is effective, the parameters of the second coil 222 such as phase, operating frequency, and duty cycle can be read through the I2C communication connection terminal. In FIG. 16, the connection terminals with serial numbers 9 and 10 of the first socket 228 are referred to as first communication socket connection terminals. The six connection terminals of the calibration unit 230 are connected to the six connection terminals 5-10 on the first socket 228 one by one.

[0173] FIG. 17 is a structural schematic diagram of a second socket according to an embodiment of the present application, and shows different logical connection terminals connected by the second socket, such as the connection terminals 1 and 2 connected to X+ and X- of the two ends of the first coil 221, the connection terminal 4 connected to a power supply, and the connection terminal 7 connected to GND. In this way, the connection terminals 9 and 10 are second communication socket connection terminals. The second socket shown in FIG. 17 is illustrative. In other embodiments, the second socket can include other numbers of connection terminals and correspond to different serial numbers, as long as it includes the ten logical connection terminals shown in FIG. 17.

[0174] In this embodiment, the first communication connection terminals and the second communication connection terminals are connected by the second socket in FIG. 17 and the first socket 228 in FIG. 15 or FIG. 16, so that the control unit is connected to the calibration unit 230.

[0175] It can be understood that the second socket can also be determined based on different homogenizing devices. For example, for the circuit board structure in FIG. 12, the second socket can only include the logical connection terminals shown in the first socket 228 in FIG. 12. For the circuit board structure in FIG. 15, the second socket can only include the logical connection terminals shown in the first socket 228 in FIG. 15. For the circuit board structure in FIG. 16, the second socket can only include the logical connection terminals shown in the first socket 228 in FIG. 16.

[0176] Of course, in order to adapt to different types of homogenizing devices, the second socket can include the logical connection terminals shown in FIG. 17. Similarly, the first socket 228 in all homogenizing devices can be set to include the logical connection terminals shown in FIG. 17, that is, the first socket 228 in FIG. 12, FIG. 14, or FIG. 15 includes the logical connection terminals shown in FIG. 17, so that different sockets do not need to be set for different homogenizing devices, and the production efficiency is improved.

[0177] In some embodiments, taking the diffusion sheet 231 in the light homogenizing device as an example, due to the assembly, tolerance and working temperature of the diffusion sheet, the motion frequency and amplitude of each diffusion sheet are not exactly the same, and thus each diffusion sheet has a separate calibration parameter stored in the calibration unit. When the light homogenizing device is working, the control unit reads the calibration parameter stored in the calibration unit to generate a control signal corresponding to the two coils, and the control signal passes through the driving unit to obtain the driving signals of the two coils, i.e., the first energizing signal and the second energizing signal, so as to drive the diffusion sheet to vibrate according to the driving current waveform generated by the accurate parameter, so as to ensure the consistency of the vibration motion track and thus ensure good diffusion spot and light homogenizing effect.

[0178] The vibration consistency of the non-calibratable light homogenizing device is determined by the preset parameter, and the control unit generates a control signal according to the preset parameter, which can be determined according to the working frequency, duty cycle and phase difference parameters of the driving current waveform corresponding to the required motion track of the actual light homogenizing device.

[0179] FIG. 18 is a structural schematic diagram of the control unit according to an embodiment of the present application. As shown in FIG. 18, in some embodiments, the control unit can be an MCU, and the control signal output connection ends in the control unit include a first control signal output connection end RA4, a second control signal output connection end RA5, a third control signal output connection end PB3 and a fourth control signal output connection end PB2. The four connection ends in the control unit can be pin structures respectively.

[0180] Since the control waveform data output by the single-chip microcomputer is a digital quantity without current driving capability, the waveform numerical signal output is converted into an analog quantity with current driving capability by the driving unit, and finally the current waveform of the coil is a trapezoidal wave current as shown in FIG. 13 or a sinusoidal wave current as shown in FIG. 14.

[0181] FIG. 19 is a structural schematic diagram of the driving unit according to an embodiment of the present application. The driving unit can be a driving chip, and the control signal receiving connection ends in the driving unit include a first control signal receiving connection end AIN1 connected with the first control signal output connection end RA4, a second control signal receiving connection end AIN2 connected with the second control signal output connection end RA5, a third control signal receiving connection end BIN1 connected with the third control signal output connection end PB3 and a fourth control signal receiving connection end BIN2 connected with the fourth control signal output connection end PB2. The four connection ends in the driving unit can be pin structures respectively.

[0182] The first control signal receiving connection end AIN1 is connected with the first control signal output connection end RA4 and the first energizing signal output connection end 241 respectively; the second control signal receiving connection end AIN2 is connected with the second control signal output connection end RA5 and the second energizing signal output connection end 242 respectively; the third control signal receiving connection end BIN1 is connected with the third control signal output connection end PB3 and the third energizing signal output connection end 243 respectively; the fourth control signal receiving connection end BIN2 is connected with the fourth control signal output connection end PB2 and the fourth energizing signal output connection end 244 respectively.

[0183] The driving unit receives the control signal PWM1 sent by the first control signal output connection end RA4 through the first control signal receiving connection end AIN1, and carries out operational amplification processing to output the first energizing signal at the first energizing signal output connection end 241. At this time, the first energizing signal is a digital signal received by the first positive terminal of the first coil 221, and the first energizing signal is regarded as a positive voltage driving digital signal of the first coil 221.

[0184] The driving unit receives the control signal PWM2 sent by the second control signal output connection end RA5 through the second control signal receiving connection end AIN2, and carries out operational amplification processing to output the first energizing signal at the second energizing signal output connection end 242. At this time, the first energizing signal is a digital signal received by the first negative terminal of the first coil 221, and the first energizing signal is regarded as a negative voltage driving digital signal of the first coil 221.

[0185] The positive voltage driving digital signal of the first coil 221 and the negative voltage driving digital signal of the first coil 221 can obtain the voltage driving digital signal of the first coil 221, so as to obtain the analog signal of the first coil 221, that is, the alternating current received by the first coil 221, and the alternating current signal drives the vibration of the light uniforming member.

[0186] The driving unit receives the control signal PWM3 sent by the third control signal output connection end PB3 through the third control signal receiving connection end BIN1, and carries out operational amplification processing to output the second energizing signal at the third energizing signal output connection end 243. The second energizing signal is a digital signal received by the second positive terminal of the second coil 222, and the second energizing signal is regarded as a positive voltage driving digital signal of the second coil 222.

[0187] The drive unit receives the control signal PWM4 sent by the fourth control signal output connection terminal PB2 through the fourth control signal receiving connection terminal BIN2, and performs operational amplification processing to output the second power signal at the fourth power signal output connection terminal 244. The second power signal is the digital signal received by the second negative terminal of the second coil 222, and the second power signal is regarded as the negative voltage drive digital signal of the second turn.

[0188] By driving the digital signal with the positive voltage of the second coil 222 and the digital signal with the negative voltage of the second coil 222, the voltage driving digital signal of the second coil 222 can be obtained, thereby obtaining the analog signal of the second coil 222, which is the AC power received by the first coil 221. This AC power signal drives the vibration of the light-diffusing element.

[0189] In this embodiment, the control signals output by the four control signal output terminals of the control unit are PWM (Pulse Width Modulation) digital signals. The first control signal output terminal RA4 outputs a PWM1 signal connected to the X+ port of the first coil 221. The second control signal output terminal RA5 outputs a PWM2 signal connected to the X- port of the first coil 221. The third control signal output terminal BIN1 outputs a PWM3 signal connected to the Y+ port of the second coil 222. The fourth control signal output terminal PB2 outputs a PWM4 signal connected to the Y- port of the second coil 222.

[0190] In some embodiments, the control unit is supplied with a voltage of 3.3V to generate a voltage waveform acting on the homogenizing device, and outputs four control signals PWM1, PWM2, PWM3, and PWM4 with a voltage level of 3.3V. The four digital signals reach the drive unit respectively, and after operational amplification, a power-on signal with a voltage level of 5V is obtained. This corresponds to the voltage requirement of 5V for the first coil 221 and the second coil 222. The power-on signal is a voltage-driven digital signal, which is output through the corresponding power-on signal output connection terminal to obtain an alternating current of trapezoidal wave (as shown in Figure 13) or sine wave (as shown in Figure 14) with positive and negative changes in the first coil 221 and the second coil 222. The first coil 221 and the second coil 222 vibrate under the drive of the alternating current. The 3.3V voltage of the control unit and the 5V voltage of the drive unit are exemplary. In other embodiments, the voltage of the control unit can also be 2.2V, 3V, 3.2V, etc. Different values ​​can be set according to different needs. No specific limitation is made here. Similarly, the voltage of the drive unit can also be 5.6V, 6V, 7V, etc. Different values ​​can also be set according to different needs. No specific limitation is made here.

[0191] As the first energizing signal and the second energizing signal, in some embodiments, in one cycle, the first control signal output connection end RA4 outputs a control signal in the first half cycle, the control signal output in the first half cycle is processed by the operational amplification of the driving unit to obtain the first energizing signal input to the first positive terminal of the first coil 221 in the first half cycle, and the second control signal output connection end RA5 outputs a control signal in the second half cycle, the control signal output in the second half cycle is processed by the operational amplification of the driving unit to obtain the first energizing signal input to the first negative terminal of the first coil 221 in the second half cycle.

[0192] The third control signal output connection end PB3 outputs a control signal in the first half cycle, the control signal output in the first half cycle is processed by the operational amplification of the driving unit to obtain the second energizing signal input to the second positive terminal of the second coil 222 in the first half cycle, and the fourth control signal output connection end BIN2 outputs a control signal in the second half cycle, the control signal output in the second half cycle is processed by the operational amplification of the driving unit to obtain the second energizing signal input to the second negative terminal of the second coil 222 in the second half cycle.

[0193] As the phase difference between the first energizing signal and the second energizing signal, the phase difference between the control signal output by the first control signal output connection end RA4 and the control signal output by the third control signal output connection end PB3 is one quarter of a cycle, and the phase difference between the control signal output by the second control signal output connection end RA5 and the control signal output by the fourth control signal output connection end BIN2 is one quarter of a cycle.

[0194] As shown in FIG. 18, in some embodiments, the VDD connection end 1 and the GND connection end 14 are respectively used for power supply and grounding. The power supply VCC and the grounding end are provided with a 0.1 μF (0.1 micro-farad) capacitor C1, and the control unit is provided with trigger connection ends 4, 5 corresponding to TRIGX, TRIGY, which can be connected with the first socket 228, the second socket, and the calibration unit 230 to obtain the parameters of the first coil 221 and the second coil 222.

[0195] And the connection end 9 and the connection end 8 in FIG. 18 are recorded as the second communication connection end, which can be connected with the first socket, the second socket, and the calibration unit for reading the calibration parameters. The PA2 connection end 12 and the PA1 connection end 11 in FIG. 22 are respectively connected with RXD and TXD, which are serial communication ports, the RESET (reset) connection end 10 is connected with the socket XP1 with power supply VCC and grounding, which can be used for online programmable program and downloading the program into the control unit, and the resistance R5 of 47k (4700 ohms) and the capacitor C3 of 1n (1 nanofarad) are connected between VCC and grounding.

[0196] The second communication connection end (connection end 9 and connection end 8) in FIG. 18 is connected with 4.7k resistors R3 and R4 respectively, the EXTCLK (external clock) connection end 13 of the control unit is connected with the crystal oscillator Z1, such as the 8M (8MHz) crystal oscillator Z1 in FIG. 17, the crystal oscillator Z1 is supplied with power through VCC, and the VCC connection end and the GND connection end of the crystal oscillator Z1 are provided with a 0.1u capacitor C1, the OE (enable) connection end of the crystal oscillator Z1 is pulled up high through a 4.7k resistor R1 to make the enable effective, and a 22R (22Ω) resistor R2 is connected between the OUT connection end of the crystal oscillator Z1 and the EXTCLK connection end 13.

[0197] As shown in FIG. 19, in some embodiments, the VM connection end 12 of the driving unit is connected with a 5V voltage, there are a 22u (22μF) capacitor C4 and a 0.1u capacitor C5 connected in parallel between the VM connection end 12 and the ground, the control signal output connection ends (connection ends 16, 15, 9 and 10) of the control unit and the digital signal input connection ends in the driving unit are respectively connected in series with resistors R6, R7, R8 and R9 with a value of 0, the EN (enable) connection end 1 is connected with a 3.3V voltage VCC, and there are a resistor R10 with a value of 0 and a 10k (10000Ω) resistor R11 between the voltage VCC and the ground, the AOUT1 connection end 2 is the first power-on signal output connection end 241, the AOUT2 connection end 4 is the second power-on signal output connection end 242, the BOUT1 connection end 7 is the third power-on signal output connection end 243, and the BOUT2 connection end 5 is the fourth power-on signal output connection end 244.

[0198] The AISEN connection end 3 and the BISEN connection end 6 (connection ends for changing the resistance value of an external resistor to set the size of the output current) in FIG. 19 are connected with the ground, the SCL connection end 11 is a synchronous clock line connection end, the SDA connection end 14 is a data line connection end, and the GND connection end 13 is a ground connection end.

[0199] The nFAULT connection end 8 (fault indication connection end) is externally connected with a 3.3V supply voltage VCC, and a 10k resistor R12 is connected in series between the nFAULT connection end 8 and the supply voltage VCC.

[0200] In some embodiments, as shown in FIG. 20, the SCL connection end 11 and the SDA connection end 14 of the driving unit are externally connected with a 3.3V supply voltage VCC, a 10k / NC (NC means reserved, but by default no component is attached) resistor R13 is connected in series between the SCL connection end 11 and the supply voltage VCC, a 10k resistor R15 is connected in series between the SCL connection end 11 and the ground, a 10k / NC resistor R14 is connected in series between the SDA connection end 14 and the supply voltage VCC, and a 10k resistor R16 is connected in series between the SDA connection end 14 and the ground.

[0201] The connection end in the related structure in FIG. 18 and FIG. 19 is set as an example, and in other embodiments, other structures can also be used as long as the functions shown in the embodiments are achieved, and the parameters of the related structure in FIG. 18 and FIG. 19 are set as an example, and in other embodiments, other parameters can also be used, and the parameters can be set to make the related structure achieve the functions shown in the embodiments.

[0202] In the embodiment, the phase difference between the control signal output by the first control signal output connection end RA4 and the control signal output by the third control signal output connection end PB3 is one quarter of a period, and the phase difference between the digital signal output by the second control signal output connection end RA5 and the control signal output by the fourth control signal output connection end PB2 is one quarter of a period.

[0203] Since the control signal is a digital signal, if the digital signal is regarded as a digital voltage signal, such as a voltage waveform signal, the phase difference between the waveform of the digital voltage signal output by the first control signal output connection end RA4 and the waveform of the digital voltage signal output by the third control signal output connection end PB3 is one quarter of a period, and the phase difference between the waveform of the digital voltage signal output by the second control signal output connection end RA5 and the waveform of the digital voltage signal output by the fourth control signal output connection end PB2 is one quarter of a period.

[0204] FIG. 21 is a waveform diagram of the digital signal output by the control unit according to an embodiment of the present application, wherein PWM1 and PWM2 are a group and respectively act on the positive and negative terminals of the first coil 211, and can form an alternating current with a trapezoidal waveform as shown in FIG. 13 in the first coil 211, and PWM3 and PWM4 are a group and respectively act on the positive and negative terminals of the second coil 222, and can form an alternating current with a trapezoidal waveform as shown in FIG. 13 in the second coil 222.

[0205] FIG. 22 is a waveform diagram of the digital signal output by the control unit according to another embodiment of the present application, wherein PWM1 and PWM2 are a group and respectively act on the positive and negative terminals of the first coil 211, and can form an alternating current with a sinusoidal waveform as shown in FIG. 14 in the first coil 211, and PWM3 and PWM4 are a group and respectively act on the positive and negative terminals of the second coil 222, and can form an alternating current with a sinusoidal waveform as shown in FIG. 14 in the second coil 222.

[0206] The hardware circuit structure of the alternating current of the sine wave and the alternating current of the trapezoidal wave can be the same or different. When the sine wave and the trapezoidal wave both adopt the control unit and the driving unit and the corresponding circuit structure shown in FIGS. 18-20, only the waveform pulse width modulation data in the program of the single-chip microcomputer MCU needs to be changed, and the waveform output by the single-chip microcomputer MCU is changed, so that the switching of the sine wave and the trapezoidal wave can be realized.

[0207] As shown in FIG. 21 or 22, the phase difference between the waveform PWM1 of the first energizing signal output by the first energizing signal output connection end 241 (which is connected to the positive terminal of the first coil 221 and can be regarded as a positive digital signal) and the waveform PWM3 of the second energizing signal output by the third energizing signal output connection end 243 (which is connected to the positive terminal of the second coil 222 and can be regarded as a positive digital signal) is one quarter of a period, that is, the phase difference is 90°, and the phase difference between the waveform PWM2 of the first energizing signal output by the second energizing signal output connection end 242 (which is connected to the negative terminal of the first coil 221 and can be regarded as a negative digital signal) and the waveform PWM4 of the second energizing signal output by the fourth energizing signal output connection end 244 (which is connected to the negative terminal of the second coil 222 and can be regarded as a negative digital signal) is one quarter of a period, so that the control of the circular or elliptical motion track of the light homogenizing element can be realized.

[0208] The first energizing signal and the second energizing signal can also be digital signals, such as digital voltage signals, and the phase difference between the waveform PWM1 of the positive digital voltage signal output by the first energizing signal output connection end 241 and the waveform PWM3 of the digital voltage signal of the second energizing signal output by the third energizing signal output connection end 243 is one quarter of a period, and the phase difference between the waveform PWM2 of the digital voltage signal of the first energizing signal output by the second energizing signal output connection end 242 and the waveform PWM4 of the digital voltage signal of the second energizing signal output by the fourth energizing signal output connection end 244 is one quarter of a period.

[0209] One period shown in the embodiment can be regarded as the time for the light homogenizing element 231 to move one circle.

[0210] In some embodiments, in the period for the light homogenizing element 231 to move one circle, the first control signal output connection end RA4 outputs the control signal in the first half period, and the second control signal output connection end RA5 outputs the control signal in the second half period; the third control signal output connection end PB3 outputs the control signal in the first half period, and the fourth control signal output connection end PB2 outputs the control signal in the second half period. It can be understood that the output control signal shown here is a control signal with a duty ratio that is not all zero.

[0211] In the period of one circle of the movement of the light homogenizing member 231, the first control signal output connection end RA4 outputs a control signal in the first half period, that is, a digital signal with a duty ratio not equal to zero, and outputs a digital signal in the second half period, but the digital signal is different from the control signal output in the first half period, and the first control signal output connection end RA4 outputs a digital signal with a duty ratio of 0 in the second half period. Taking the digital voltage signal output by the control unit as an example, the first control signal output connection end RA4 outputs a digital voltage signal with a duty ratio of 0 in the second half period. Similarly, the second control signal output connection end RA5 outputs a digital signal with a duty ratio of 0 in the first half period and outputs a control signal with a duty ratio not equal to zero in the second half period; the third control signal output connection end PB3 outputs a control signal with a duty ratio not equal to zero in the first half period and outputs a digital signal with a duty ratio of 0 in the second half period; and the fourth control signal output connection end PB4 outputs a digital signal with a duty ratio of 0 in the first half period and outputs a control signal in the second half period.

[0212] The control signal outputted by the control signal output connection end of the control unit in this embodiment is a digital signal with a duty cycle not equal to zero, and at other times, the control signal outputted by the control signal output connection end is not a control signal, which is regarded as a digital signal with a duty cycle equal to zero. In this way, the digital signal with a duty cycle equal to zero and the control signal with a duty cycle not equal to zero outputted by the control signal output connection end, after being amplified by the drive unit, act on the first coil 221 and the second coil 222, and AC power for driving the first coil 221 and the second coil 222 can be obtained. The waveform of the control signal outputted by the output connection end can determine the waveform of the AC power. It should be understood that the control signal outputted by the output connection end should correspond to the power-on signal outputted by the power-on signal output connection end in the drive unit. After the control signal is amplified by the drive unit, the first power-on signal and the second power-on signal are obtained. For example, the first control signal output connection end RA4 outputs a control signal in the first half cycle, the first control signal receiving connection end receives the control signal, and after the control signal is amplified by the drive unit, the first power-on signal outputted by the first power-on signal output connection end 241 in the first half cycle (the signal received by the first positive terminal of the first coil 221) is obtained. The second control signal output connection end RA5 outputs a control signal in the second half cycle, the second control signal receiving connection end receives the control signal, and after the control signal is amplified by the drive unit, the first power-on signal outputted by the second power-on signal output connection end 242 in the second half cycle (the signal received by the first negative terminal of the first coil 221) is obtained. The third control signal output connection end PB3 outputs a control signal in the first half cycle, the third control signal receiving connection end receives the control signal, and after the control signal is amplified by the drive unit, the second power-on signal outputted by the third power-on signal output connection end 243 in the first half cycle (the signal received by the second positive terminal of the second coil 222) is obtained. The fourth control signal output connection end PB2 outputs a control signal in the second half cycle, the fourth control signal receiving connection end receives the control signal, and after the control signal is amplified by the drive unit, the second power-on signal outputted by the fourth power-on signal output connection end 244 in the second half cycle (the signal received by the second negative terminal of the second coil 222) is obtained.

[0213] In the embodiment, in one period, the period can be divided into the first half period and the second half period, for one coil, the direction of the coil current in the first half period and the second half period is opposite. For example, for the first coil 221, the first control signal output connection end RA4 outputs the control signal in the first half period, at this time, the duty ratio of the digital signal output by the second control signal output connection end RA5 is 0, while in the second half period, the second control signal output connection end RA5 outputs the control signal, and the first control signal output connection end RA4 outputs the digital signal with the duty ratio of 0; for the second coil 222, the third control signal output connection end PB3 outputs the control signal in the first half period, at this time, the fourth control signal output connection end PB2 outputs the digital signal with the duty ratio of 0, while in the second half period, the fourth control signal output connection end PB2 outputs the control signal, and the third control signal output connection end PB3 outputs the digital signal with the duty ratio of 0.

[0214] The control signal after passing through the driving unit, in one period, the first energizing signal output connection end 241 outputs the first energizing signal to the first coil 221 in the first half period, the first coil 221 obtains the positive digital signal corresponding to the positive terminal, and the second energizing signal output connection end 242 outputs the first energizing signal to the first coil 221 in the second half period, the first coil 221 obtains the negative digital signal corresponding to the negative terminal, the digital voltage signal between the two ends of the first coil 221 is the positive digital signal minus the negative digital signal, and the driving current in one period is the alternating current with positive and negative changes, the current is positive in the first half period and negative in the second half period, and vice versa.

[0215] The third energizing signal output connection end 243 and the fourth energizing signal output connection end 244 output the second energizing signal to the second coil 222 in one period, the two ends of the second coil 222 obtain the digital voltage signal and the first energizing signal output by the first energizing signal output connection end 241 and the second energizing signal output connection end 242, and the two ends of the first coil 221 obtain the digital voltage signal in the same way, which is not repeated here.

[0216] In the embodiment, the digital signal output by the control signal output connection end of the control unit is the PWM signal, and the digital signal output by the control unit is taken as an example of voltage, the PWM1 output by the first control signal output connection end RA4 and the PWM2 output by the second control signal output connection end RA5 correspond to the waveform of the positive digital voltage signal and the waveform of the negative digital voltage signal of the first coil 221.

[0217] In some embodiments, the PWM output by the control signal output connection end in one period can be described by the duty cycle. Taking the PWM1 output by the first control signal output connection end RA4 as an example, the PWM1 is a digital voltage signal, which includes a digital signal with a duty cycle of zero output in the first half of the period corresponding to the control signal output by the first control signal output connection end RA4 and in the second half of the period, and a digital voltage signal with a duty cycle not equal to zero output in the first half of the period. The period can be divided into multiple small periods, each small period corresponds to a duty cycle, and the duty cycle in the small period can be adjusted. Therefore, the duty cycle of the PWM1 in all small periods in the second half of the period is zero, and the duty cycle of all small periods in the first half of the period can be determined according to the waveform of the analog signal required by the first coil 221, i.e., the waveform of the alternating current.

[0218] When the waveform of the analog signal required by the first coil 221 is a sine waveform, the parameters of the sine waveform in the first half of the period are obtained to obtain the duty cycle of all small periods of the PWM1 in the first half of the period, so that the waveform of the PWM1 in the first half of the period can be obtained. For the PWM2, the parameters of the sine waveform in the second half of the period are obtained to obtain the duty cycle of all small periods of the PWM2 in the second half of the period, so that the waveform of the PWM2 in the second half of the period can be obtained.

[0219] In some embodiments, the waveform of the analog signal required by the first coil 221 can be confirmed by the calibration parameters, and if the light uniformization device does not have a calibration unit, the parameters can be determined by presetting.

[0220] The sine waveform in the present embodiment is illustrative, and in other embodiments, it can also be other waveforms such as trapezoidal wave, etc. The demand of the laser projection device is set, which is not limited specifically herein, and for the sine waveform, the period can be divided into as many small periods as possible, so that the control signals of the PWM1 and the PWM2 after amplification and processing by the driving unit act on the first coil 221, or the control signals of the PWM3 and the PWM4 act on the second coil 222 to obtain an analog voltage waveform as close to the sine waveform as possible. In other embodiments, according to the different waveforms of the required analog signal, the number of small periods divided from the period and the duty cycle are also different. The division of the small period and the value of the duty cycle in each small period in the waveform corresponding to the PWM signal can be adjusted, so that the waveform of the corresponding analog signal can be determined.

[0221] In some embodiments, the first control signal output connection end RA4 and the second control signal output connection end RA5 output a motion frequency in a frequency range of 90-130 Hz (Hertz), and each cycle contains 200 sub-cycles, and the duty cycle of the PWM is adjustable, so the frequency range of the driving sub-cycles is 18-26 kHz (Kilohertz). For example, the frequency range can also be other parameters, which are not specifically limited here.

[0222] In some embodiments, the waveform of the analog signal required by the first coil 221 is a trapezoidal wave, and the first half of the cycle of the control signal output by the first control signal output connection end RA4 is divided into three stages in time sequence. In the first stage, the duty cycle of the digital signal output by the first control signal output connection end RA4 increases, in the middle stage, the duty cycle of the digital signal output by the first control signal output connection end RA4 remains unchanged, and in the last stage, the duty cycle of the digital signal output by the first control signal output connection end RA4 decreases. Thus, in the first half of the cycle, the analog voltage waveform input to the first coil 221 is a trapezoidal wave. The second control signal output connection end RA5 is similarly divided into three stages, and the duty cycle of each sub-cycle increases, then remains unchanged, and finally decreases. In this way, the voltage waveform applied to the first coil 221 is the first energizing signal received by the positive terminal of the first coil 221 minus the first energizing signal received by the negative terminal of the first coil 221. Therefore, the analog waveform of the first coil 221 in a cycle is a trapezoidal wave with positive and negative alternation.

[0223] As shown in FIGS. 21 and 22, the waveforms of two digital signals output by the control unit are shown. In this embodiment, the voltage output by the control unit is 3.3 V, and the digital signal PWM1 output by the first control signal output connection end RA4 gradually increases from 0 to the maximum in the first half of the cycle (0-180°), which corresponds to the first stage (the first stage) in the three stages. As shown in FIGS. 21 and 22, 1 / 8 cycle corresponds to the first stage, 1 / 8 cycle to 3 / 8 cycle corresponds to the second stage (the middle stage), and the duty cycle remains unchanged at the maximum of the first stage. 3 / 8 cycle to 4 / 8 cycle corresponds to the third stage (the last stage), and the duty cycle decreases to 0. The duty cycle of the second stage is the maximum duty cycle of the entire waveform, which determines the amplitude of the vibration of the light uniforming member 231. The larger the duty cycle, the larger the amplitude, and the smaller the duty cycle, the smaller the amplitude. The PWM1 waveform in the first half of the cycle corresponds to the control signal output by the first control signal output connection end RA4, and the PWM1 waveform in the second half of the cycle corresponds to the digital signal with a duty cycle of zero output by the first control signal output connection end RA4.

[0224] PWM2 corresponds to the negative pole of the first coil 221, since the control unit can only generate a positive waveform, PWM2 is also a positive waveform, in this way, the waveform of the first half cycle PWM1 is the same as the waveform of the second half cycle (180°-360°) PWM2, but the phase difference between PWM1 and PWM2 is 180°, the driving voltage waveform on the first coil 221 is the difference between the waveforms of the first energizing signals of the positive and negative terminals of the first coil 221, so that the positive and negative poles of the first coil 221 are subtracted to generate a negative driving voltage waveform, and finally the current of the driven coil is alternating current with positive and negative alternation, and the current waveform is the trapezoidal wave shown in FIG. 13 or the sine wave shown in FIG. 14.

[0225] FIG. 21 or FIG. 22 is exemplary, in other embodiments, the first half cycle can not be divided into four time periods, the first time period corresponds to the first stage, the middle two time periods correspond to the second stage, and the last time period corresponds to the third stage, only three stages exist in the half cycle, and the duty cycle of the first stage increases, the duty cycle of the second stage remains the maximum value of the first stage, and the duty cycle of the third stage decreases, so that the trapezoidal wave can be obtained.

[0226] The principles of PWM3 and PWM4 can be referred to PWM1 and PWM2, which will not be described here.

[0227] In some embodiments, the phase difference between the output of PWM1 and the output of PWM3 is 90°.

[0228] In this embodiment, the voltage level output by the control unit is 3.3V, so it needs to be converted to a driving capability of 1A maximum current after passing through the driving unit, and the level is converted to 5V required by the first coil 221 and the second coil 222, at this time, the waveforms of the first energizing signal PWM11 output by the first energizing signal output connection end 241 and the first energizing signal PWM22 output by the second energizing signal output connection end 242 can be referred to FIG. 23.

[0229] FIG. 23 is a voltage waveform diagram of the first energizing signal according to an embodiment of the present application, after passing through the driving unit, the duty cycle and phase of the waveform of PWM11 are completely consistent with the waveform of PWM1, only the voltage level is converted to 5V, and it has a large current driving capability; the duty cycle and phase of the waveform of PWM12 are completely consistent with the waveform of PWM2, only the voltage level is converted to 5V, and it has a large current driving capability.

[0230] The second energizing signal received by the second coil 222 is the same, which will not be described here.

[0231] In the embodiment, the first energizing signal shown in FIG. 23 is loaded to the first coil 221, and the waveform of the analog signal obtained by the first coil 221 is shown in FIG. 13 or FIG. 14. Taking the voltage signal as an example of the analog signal loaded to the first coil 221, the waveform of the analog voltage signal loaded to the first coil 221 is the positive voltage X+ minus the negative voltage X-. In the case of a constant temperature, the resistance of the coil can be regarded as a constant, and thus the current waveform of the alternating current driving the first coil 221 is similar to the waveform of the analog voltage signal, and is proportional to the waveform of the analog voltage signal, that is, the waveform of the alternating current of the first coil 221 is the same as (the numerical value can be different from) the waveform shown in FIG. 13 or FIG. 14.

[0232] In the embodiment, the motion trajectory of the light homogenizing member 231 is a circle or an ellipse, and the size of the radius of the circle or the ellipse is determined by the duty cycle of the waveform of the output control signal. The size of the amplitude of the motion of the light homogenizing member 231 can be changed by changing the duty cycle. The larger the duty cycle, the larger the area of the circular or elliptical trajectory of the motion of the light homogenizing member 231. The smaller the duty cycle, the smaller the amplitude, and the smaller the area of the circle or the ellipse (the smaller the radius of the circle or the short axis of the ellipse). In this way, in the embodiment, the driving unit amplifies the control signal to obtain the first energizing signal and the second energizing signal for driving the light homogenizing member 231. The first energizing signal and the second energizing signal act on the first coil 221 and the second coil 222 to obtain the alternating current for driving the two coils. The waveform of the alternating current can be a trapezoidal wave or a sine wave. Similarly, based on the required waveform of the alternating current, the control unit can generate a corresponding digital signal to make the obtained alternating current meet the corresponding waveform, so that the motion trajectory of the waveform of the alternating current is a circle or an ellipse, and the light homogenizing effect and the speckle elimination effect of the light homogenizing device are improved.

[0233] In some embodiments, as shown in FIG. 9, for the laser projection device in the above-mentioned embodiments, the driving module 24 is configured to: in the period of one cycle of the motion of the light homogenizing member 231, send the first energizing signal to the first coil 221 through the first energizing signal output connection end 241 in the first half period, and send the first energizing signal to the first coil 221 through the second energizing signal output connection end 242 in the second half period, so that the first coil 221 is energized.

[0234] In the period of one cycle of the motion of the light homogenizing member 231, the second energizing signal is sent to the second coil 222 through the third energizing signal output connection end 243 in the first half period, and the first energizing signal is sent to the second coil 222 through the fourth energizing signal output connection end 244 in the second half period, so that the second coil 222 is energized.

[0235] The phase difference between the first energizing signal sent by the first energizing signal output connection end 241 and the second energizing signal sent by the third energizing signal output connection end 243 is one quarter of a period, the phase difference between the first energizing signal sent by the second energizing signal output connection end 242 and the second energizing signal sent by the fourth energizing signal output connection end 244 is one quarter of a period, and the light homogenizing member 231 moves under the magnetic force generated after the first coil 221 and / or the second coil 222 is energized.

[0236] The control unit in the driving module 24 in the embodiment outputs a control signal, and the driving unit amplifies the control signal to obtain the first energizing signal and the second energizing signal, and alternately outputs the energizing signal in a half period corresponding to the two energizing signal output connection ends connected to one coil, so as to realize the change of the current direction in the coil.

[0237] In some embodiments, as shown in FIG. 14 or FIG. 16, the light homogenizing device comprises a calibration unit 230, which is provided with a calibration parameter of the light homogenizing member 231; the driving module 24 is further configured to: read the calibration parameter in the calibration unit 230; generate the first energizing signal and the second energizing signal based on the calibration parameter, so that the movement track of the light homogenizing member 231 driven to move after the first coil 221 is energized by the first energizing signal and / or the second coil 222 is energized by the second energizing signal conforms to the calibration parameter.

[0238] When the light homogenizing device has a calibration function, the waveform of the alternating current in the coil can be determined by obtaining the calibration parameter in the calibration unit 230, specifically, the control unit reads the calibration parameter to send the corresponding waveform control signal, and the control signal is input into the driving unit for operational amplification, so as to obtain the trapezoidal wave or the sine wave of the alternating current for driving the coil.

[0239] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0240] For the sake of explanation, the foregoing descriptions have been presented in terms of specific embodiments. However, it is to be appreciated that specific embodiments described herein are not intended to limit the scope of the present application, which is defined with reference to the following claims. Various modifications and changes can be made thereto by those skilled in the art which fall within the scope of the present application as defined by the following claims. The embodiments were chosen and described in order to explain the principles of the application and the practical application and to enable others skilled in the art to understand for implementing various embodiments and with various modifications as are suited to the particular use contemplated.

Claims

1. A laser light source, characterized by, The laser light source (2) comprises: a light homogenizing device (22) and a driving module (24); the light homogenizing device (22) comprises at least one coil (220) and a light homogenizing element (231); the driving module (24) is connected with the at least one coil (220) and is configured to send an energizing signal to the at least one coil (220) to energize the at least one coil (220), and the light homogenizing element (231) moves along a circular or elliptical track under the magnetic force generated by the at least one coil (220) after being energized.

2. The laser light source according to claim 1, characterized by, the coil (220) comprises a first coil (221) and a second coil (222); the driving module (24) is connected with the first coil (221) and the second coil (222) and is configured to send a first energizing signal to the first coil (221) to energize the first coil (221) and send a second energizing signal to the second coil (222) to energize the second coil (222), and the light homogenizing element (231) moves along a circular or elliptical track under the magnetic force generated by the first coil (221) and / or the second coil (222) after being energized.

3. The laser light source according to claim 2, characterized by the magnetic force generated by the first coil (221) after being energized and the magnetic force generated by the second coil (222) after being energized are arranged at an angle greater than zero and less than 180°.

4. The laser light source according to claim 3, characterized by the magnetic force generated by the first coil (221) after being energized is distributed along a first coordinate axis, the magnetic force generated by the second coil (222) after being energized is distributed along a second coordinate axis, the first coordinate axis and the second coordinate axis are perpendicular to each other, and a plane determined by the first coordinate axis and the second coordinate axis is perpendicular to the light path direction of the light homogenizing element (231).

5. The laser light source according to any one of claims 2 to 4, characterized by, the phase difference between the first energizing signal and the second energizing signal is one quarter of a period.

6. The laser light source according to claim 5, characterized by the first coil (221) comprises a first positive terminal and a first negative terminal, the first positive terminal receives the first energizing signal in the first half of the period, and the first negative terminal receives the first energizing signal in the second half of the period; the second coil (222) comprises a second positive terminal and a second negative terminal, the second positive terminal receives the second energizing signal in the first half of the period, and the second negative terminal receives the first energizing signal in the second half of the period.

7. The laser light source according to claim 6, characterized by the first half of the period of the first energizing signal received by the first positive terminal is divided into three stages in time sequence, in the first stage, the duty cycle of the first energizing signal received by the first positive terminal increases, in the middle stage, the duty cycle of the first energizing signal received by the first positive terminal remains unchanged, and in the last stage, the duty cycle of the first energizing signal received by the first positive terminal decreases.

8. The laser light source according to any one of claims 1 to 7, characterized by, the driving module (24) comprises a control unit and a driving unit, the control unit is connected with the driving unit, the driving unit receives a control signal sent by the control unit and amplifies the control signal to generate the first energizing signal and the second energizing signal; The homogenizing device (22) comprises a calibration unit (230) provided with calibration parameters of the homogenizing element (231); wherein the control unit is connected with the calibration unit (230), and the control unit reads the calibration parameters in the calibration unit (230) to generate the control signal.

9. The laser light source according to claim 8, characterized by The calibration unit (230) comprises a first communication connection end, the control unit comprises a second communication connection end, the first communication connection end is connected with the second communication connection end, and the control unit reads the calibration parameters based on the second communication connection end and the first communication connection end.

10. The laser light source according to claim 2, characterized by, The driving module (24) comprises a first energizing signal output connection end (241), a second energizing signal output connection end (242), a third energizing signal output connection end (243) and a fourth energizing signal output connection end (244); The first energizing signal output connection end (241) and the second energizing signal output connection end (242) are respectively connected with two ends of the first coil (221) for outputting the first energizing signal to the first coil (221); The third energizing signal output connection end (243) and the fourth energizing signal output connection end (244) are respectively connected with two ends of the second coil (222) for outputting the second energizing signal to the second coil (222).

11. The laser light source according to claim 10, characterized by The driving module (24) comprises a control unit and a driving unit, the control unit comprises a first control signal output connection end (RA4), a second control signal output connection end (RA5), a third control signal output connection end (PB3) and a fourth control signal output connection end (PB2), and the driving unit comprises a first control signal receiving connection end (AIN1), a second control signal receiving connection end (AIN2), a third control signal receiving connection end (BIN1) and a fourth control signal receiving connection end (BIN2); The first control signal receiving connection end (AIN1) is connected with the first control signal output connection end (RA4) and the first energizing signal output connection end (241) respectively; The second control signal receiving connection end (AIN2) is connected with the second control signal output connection end (RA5) and the second energizing signal output connection end (242) respectively; The third control signal receiving connection end (BIN1) is connected with the third control signal output connection end (PB3) and the third energizing signal output connection end (243) respectively; The fourth control signal receiving connection end (BIN2) is connected with the fourth control signal output connection end (PB2) and the fourth energizing signal output connection end (244) respectively.

12. The laser light source according to claim 11, wherein The first control signal output connection end (RA4) outputs a control signal in the first half period, and the second control signal output connection end (RA5) outputs a control signal in the second half period. The third control signal output connection end (PB3) outputs a control signal in the first half cycle, and the fourth control signal output connection end (PB2) outputs a control signal in the second half cycle; The phase difference between the control signal output by the first control signal output connection end (RA4) and the control signal output by the third control signal output connection end (PB3) is one fourth of a cycle, and the phase difference between the control signal output by the second control signal output connection end (RA5) and the control signal output by the fourth control signal output connection end (PB2) is one fourth of a cycle.

13. The laser light source according to any one of claims 1 to 12, characterized by, The light homogenizing device (22) further comprises: a support base (223); a moving plate (224) fixed on the support base (223) by elastic means (225); magnetic means (226) fixed on the moving plate (224); the light homogenizing piece (231) is fixed on the moving plate (224), when the coil (220) comprises a first coil (221) and a second coil (222), the first coil (221) and the second coil (222) are respectively fixed on the support base (223), the magnetic means (226) are respectively opposite to the positions of the first coil (221) and the second coil (222), the magnetic force generated by the energized first coil (221) and / or the second coil (222) drives the magnetic means (226) to move, the magnetic means (226) drive the moving plate (224) to move, and the moving plate (224) drives the light homogenizing piece (231) to move.

14. A laser projection device, comprising: The laser projection device (100) comprises the laser light source (2) according to any one of claims 1 to 13.

Images