Laser projection device

Abstract

An embodiment of the present application discloses a laser projection device, belonging to the field of projection technology. The laser projection device includes: an optical engine, a projection screen, a connecting frame, and a functional component; the optical engine is connected to a first side of the connecting frame, the projection screen is fixedly connected to a second side of the connecting frame, at least one of the optical engine, the projection screen, and the connecting frame is used to be fixedly connected to a support body, and the first side and the second side are opposite; the optical engine is electrically connected to the functional component. In the embodiment of the present application, the connecting frame can connect the optical engine and the projection screen into a whole, so that the optical engine is not easily displaced relative to the projection screen, and further it can be ensured that the light beam emitted by the optical engine can be projected at the correct position of the projection screen. In addition, the functional component is arranged independently of the optical engine, thereby achieving the effect of reducing the volume of the optical engine.

Description

[0001] The embodiments of this application claim priority to Chinese patent application No. 202010117196.8, filed on February 25, 2020, with the invention name “Laser Projection Device”, the entire contents of which are incorporated by reference into the embodiments of this application. Technical Field

[0002] The embodiments of the present application relate to the field of projection technology, and in particular to a laser projection device. Background Art

[0003] With the continuous development of technology, laser projection equipment is increasingly being used in people's work and daily lives. Currently, laser projection equipment mainly consists of an optical engine and a projection screen. The optical engine's light outlet faces the projection screen, emitting a light beam to the projection screen, which receives the light beam and displays the image.

[0004] In related technologies, such as Figure 1 As shown, the projection screen 1 is fixed on the support 2, and the optical engine 3 is supported on the support cabinet 4. In this way, the optical engine 3 supported on the support cabinet 4 is easily displaced, and further, it is difficult to adjust to the initial projection position after the optical engine 3 is displaced. Summary of the Invention

[0005] The embodiments of the present application provide a laser projection device that can solve the problem of easy displacement of the optical engine in the laser projection device. The technical solution is as follows:

[0006] A laser projection device, comprising: an optical engine, a projection screen, a connecting frame, and functional components;

[0007] The optical engine is connected to a first side of the connecting frame, the projection screen is fixedly connected to a second side of the connecting frame, at least one of the optical engine, the projection screen, and the connecting frame is configured to be fixedly connected to a support, and the first side is opposite to the second side;

[0008] The optical engine is electrically connected to the functional component and is capable of emitting a light beam in cooperation with the functional component;

[0009] The projection screen is used to receive the light beam emitted by the optical engine to display a picture.

[0010] Optionally, the connecting frame includes a plurality of connecting rods, a first end of each connecting rod is connected to the projection screen, a second end of each connecting rod is connected to the optical engine, and the plurality of connecting rods are all retractable rods.

[0011] Optionally, the laser projection device includes a first housing;

[0012] The first housing is connected to the first side of the connecting frame. The housing wall of the first housing has a first light-transmitting area. The optical engine is located inside the first housing, and the light beam emitted by the optical engine can pass through the first light-transmitting area and be emitted to the projection screen.

[0013] Optionally, the laser projection device further includes a second housing, which is connected to the first side of the connecting frame, and the functional components are located inside the second housing.

[0014] Optionally, the first housing is fixed inside the second housing, and the second housing has a second light-transmitting area at a corresponding position of the first light-transmitting area. The light beam emitted by the optical engine can pass through the first light-transmitting area and the second light-transmitting area and be emitted to the projection screen.

[0015] Optionally, the first housing is connected to the second housing, and the first housing can be switched between two states: being received inside the second housing and extending outside the second housing.

[0016] Optionally, the laser projection device further includes a third housing and a fourth housing;

[0017] The third housing and the fourth housing are located on two opposite sides of the first housing, and both the third housing and the fourth housing are connected to the first side of the connecting frame;

[0018] The functional components include a first sub-functional component and a second sub-functional component. The first sub-functional component is located inside the third housing, and the second sub-functional component is located inside the fourth housing.

[0019] Optionally, the functional components include a control main board, which is located inside the first housing and is electrically connected to the optical engine.

[0020] Optionally, the functional components include a remote controller, which is located inside the first housing and is electrically connected to the control main board.

[0021] Optionally, the remote controller includes keys, which are electrically connected to the control main board.

[0022] The beneficial effects of the technical solution provided by the embodiments of the present application can at least include:

[0023] The connecting frame, using its first and second sides, connects the optical engine and projection screen into a single unit. This prevents the optical engine from shifting relative to the projection screen, ensuring that the light beam emitted by the optical engine is projected onto the correct location on the projection screen, guaranteeing a superior projection effect. Furthermore, since the functional components are independently housed from the optical engine, the overall size of the optical engine is reduced, enabling a compact design for the laser projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 It is a structural diagram of a laser projection device provided by the related art;

[0026] Figure 2 This is a schematic structural diagram of a laser projection device provided in an embodiment of the present application;

[0027] Figure 3 This is a schematic diagram of a partial structure of a projection screen provided in an embodiment of the present application;

[0028] Figure 4 This is a structural diagram of a hook and a fixing screw provided in an embodiment of the present application;

[0029] Figure 5 This is a schematic structural diagram of an optical engine provided by an embodiment of the present application;

[0030] Figure 6 is a structural diagram of another optical engine provided in an embodiment of the present application;

[0031] Figure 7 is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0032] Figure 8 This is a schematic structural diagram of another laser projection device provided in an embodiment of the present application;

[0033] Figure 9 This is a structural diagram of another laser projection device provided in an embodiment of the present application.

[0034] Reference numerals:

[0035] Related technologies:

[0036] 1: Projection screen; 2: Support body; 3: Optical engine; 4: Support cabinet.

[0037] Embodiments of the present application:

[0038] 1: Optical engine; 2: Projection screen; 3: Connecting frame; 4, Functional components; 5: First housing; 6: Second housing; 7: Third housing; 8: Fourth housing; 9: Water-cooled radiator; 10: Air-cooled radiator;

[0039] 11: Laser light source; 12: Light modulation component; 13: Projection lens; 14: Heat sink; 15: Light source heat dissipation component; 16: Light valve heat dissipation component; 21: Hook; 22: Hole position; 23: Fixing screw; 31: Connecting rod; 32: Support rod; 41: First sub-functional component; 42: Second sub-functional component; 43: Control main board; 44: Speaker; 45: Display board; 46: Power board; 51: First light-transmitting area

[0040] 111: Light source housing, 112: Light source drive board; 121: Optical engine housing; 122: Light valve drive board. Detailed implementation manners

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0042] Figure 2 Schematically shows the structure of a laser projection device according to an embodiment of the present application. As Figure 2 shown, the laser projection device includes: an optical engine 1, a projection screen 2, a connecting frame 3, and functional components 4; the optical engine 1 is connected to the first side of the connecting frame 3, the projection screen 2 is fixedly connected to the second side of the connecting frame 3, at least one of the optical engine 1, the projection screen 2, and the connecting frame 3 is used to be fixedly connected to a support body, and the first side and the second side are opposite; the optical engine 1 is electrically connected to the functional components 4 and can emit a light beam under the cooperation of the functional components 4; the projection screen 2 is used to receive the light beam emitted by the optical engine 1 to display an image.

[0043] In the embodiments of the present application, the connecting frame 3 can connect the optical engine 1 and the projection screen 2 into a whole based on its first side and second side. Therefore, relative to the projection screen 2, the optical engine 1 is not easily displaced. Furthermore, it can ensure that the light beam emitted by the optical engine 1 can be projected at the correct position of the projection screen 2, ensuring a good projection effect. In addition, since the functional components 4 are independently arranged from the optical engine 1, the overall size of the optical engine 1 is reduced, further realizing the miniaturized design of the laser projection device.

[0044] Optionally, both the first side of the connecting frame 3 and the optical engine 1, and the second side of the connecting frame 3 and the projection screen 2 are detachably connected. By way of example, both between the second side and the projection screen 2, and between the first side and the optical engine 1 are connected by screws or pins. In this way, if the projection screen 2 fails, the projection screen 2 can be detached and sent for repair separately. If the optical engine 1 fails, the optical engine 1 can be detached and sent for repair separately, thereby avoiding the inconvenience caused by sending the entire laser projection device for repair.

[0045] Optionally, the optical engine 1 is fixedly connected to the first side of the connecting frame 3. Of course, in some other embodiments, the optical engine 1 and the first side of the connecting frame 3 are rotatably connected, so that when the optical engine 1 rotates relative to the connecting frame 3, the angle between the plane where the light-emitting side of the optical engine 1 is located and the plane where the projection screen 2 is located can be switched between a first reference angle and a second reference angle.

[0046] Wherein, the first reference angle refers to the angle formed between the light-emitting side of the optical engine 1 and the plane where the projection screen 2 is located when the optical engine 1 is put into use, and the second reference angle refers to the angle formed between the light-emitting side of the optical engine 1 and the plane where the projection screen 2 is located when the optical engine 1 is not put into use. By way of example, the first reference angle is 90 degrees and the second reference angle is 0 degrees.

[0047] Optionally, the optical engine 1 and the connecting frame 3 are connected by a hinge to enable the optical engine 1 to rotate relative to the connecting frame 3. In this way, when the angle between the plane where the light-emitting side of the optical engine 1 is located and the plane where the projection screen 2 is located is the second reference angle, the optical engine 1 can be retracted, thereby reducing the overall volume of the laser projection device. At this time, at least one of the projection screen 2 and the connecting frame 3 is used to be fixedly connected to the support.

[0048] Optionally, the optical engine 1 is located at a position directly below or directly above the projection screen 2. Of course, the optical engine 1 can also be located on the left side or the right side of the projection screen 2, or the relative position between the optical engine 1 and the projection screen 2 is in other forms, as long as the light beam emitted by the optical engine 1 can be projected onto the projection screen 2.

[0049] In some embodiments, when fixing the laser projection device, one of the optical engine 1, the projection screen 2 and the connecting frame 3 is fixedly connected to the support, or two of the optical engine 1, the projection screen 2 and the connecting frame 3 are fixedly connected to the support. In some other embodiments, all three of the optical engine 1, the projection screen 2 and the connecting frame 3 are fixedly connected to the support. The embodiments of the present application do not make any limitations in this regard.

[0050] Among them, the support body fixedly connected to the projection screen 2 and the connecting frame 3 is a wall body or a fixed bracket, etc., and the support body fixedly connected to the optical engine 1 is a support cabinet or a desktop, etc.

[0051] Optionally, as Figure 3 and Figure 4 shown, when the projection screen 2 is fixed to the support body, a hook 21 is provided on the back of the projection screen 2. The hook 21 can support the projection screen 2, and the hook 21 has a plurality of hole positions 22 distributed in the height direction. In this way, after the fixing screw 23 is fixedly connected to the support body, it can be connected to the fixing screw 2 through any one of the hole positions 22 on the hook 21 to realize the fixed connection between the projection screen 2 and the support body; in addition, passing the fixing screw 23 through the hole positions 22 at different heights can realize the adjustment of the height of the projection screen 2, that is, the adjustment of the height of the laser projection device.

[0052] Next, the components included in the laser projection device will be explained

[0053] In some embodiments, the laser projection device is a laser ultra-short-throw laser projection device. Correspondingly, the optical engine 1 is an ultra-short-throw optical engine. Exemplarily, the ultra-short-throw optical engine is a DLP (Digital Light Procession) optical engine. In this way, a shorter distance can be set between the optical engine 1 and the projection screen 2, so as to realize the miniaturized design of the laser projection device.

[0054] In some embodiments, as Figure 5 shown, the optical engine 1 (not shown in the figure) includes a laser light source 11, a light modulation component 12, and a projection lens 13. The laser light source 11 is connected to the light modulation component 12, and the projection lens 13 is connected to the light modulation component 12; the laser light source 11, the light modulation component 12, and the projection lens 13 are all electrically connected to the functional component 4 and complete projection under the cooperation of the functional component 4. Among them, when the optical engine 1 is an ultra-short-throw optical engine, the projection lens 13 is an ultra-short-throw projection lens.

[0055] Optionally, as Figure 5 shown, the laser light source 11 includes a light source housing 111, a laser, and a light source drive board 112. The laser is located inside the light source housing 111 and is used to emit a light beam to the light modulation component 12. The light source drive board 112 is located outside the light source housing 111. The laser is electrically connected to the light source drive board 112, and the light source drive board 112 is electrically connected to the functional component 4.

[0056] Optionally, as Figure 5As shown, the light modulation component 12 includes an optical engine housing 121, an illumination system, a light valve, and a light valve driving board 122. The illumination system and the light valve are located inside the optical engine housing 121, and the light valve driving board 122 is located outside the optical engine housing 121 and is electrically connected to the light valve. The light valve driving board 122 is also electrically connected to the functional component 4.

[0057] Among them, the light valve is a DMD (Digital Micromirror Device), and the light valve driving board 122 is a DMD board. The illumination system adjusts the light beam emitted by the laser light source 11 to meet the light input requirements of the DMD. The DMD board is used to provide a driving signal to the DMD so that the deflected and reflected light beam can be projected onto the projection screen 2 through the projection lens 13 to display an image.

[0058] In addition, as Figure 5 and Figure 6 shown, the optical engine 1 further includes a heat sink 14, a light source heat dissipation component 15, and a light valve heat dissipation component 16. Optionally, both the light source heat dissipation component 15 and the light valve heat dissipation component 16 include a fan, a liquid cooling device, etc.

[0059] In some embodiments, the laser projection device includes a first housing 5; the first housing 5 is connected to the first side of the connecting frame 3. The housing wall of the first housing 5 has a first light transmission area 51. The optical engine 1 is located inside the first housing 5, and the light beam emitted by the optical engine 1 can pass through the first light transmission area 51 and be emitted to the projection screen 2. In this way, the first housing 5 can carry the optical engine 1, and after the first housing 5 is fixedly connected to the first side of the connecting frame 3, the relative position stability between the optical engine 1 and the projection screen 2 can be ensured, and damage to the optical engine 1 can be avoided.

[0060] Optionally, the first housing 5 is a cuboid-shaped housing or a housing of other shapes.

[0061] The first housing 5 has a limiting structure for placing the optical engine 1 to limit the optical engine 1. The first light transmission area 51 is a circular light transmission hole on the first housing 5, or a combination of a light transmission hole and a light transmission mirror, as long as it can ensure that the light beam emitted by the optical engine 1 can pass through the first light transmission area 51 and be emitted to the projection screen 2.

[0062] Among them, when the optical engine 1 is put into use, the vertical distance from the center point of the first light-transmitting area 51 to the plane where the projection screen 2 is located is equal to the product of the projection ratio of the optical engine 1 and the width of the display area on the projection screen 2. The width of the display area refers to the size of the display area in the horizontal direction. In this way, it can be ensured that the light beam emitted by the optical engine 1 can be accurately projected onto the display area of the projection screen 2, and the clarity of the displayed image on the projection screen 2 can be ensured. Correspondingly, the vertical distance from the center point of the first light-transmitting area 51 to the plane where the projection screen 2 is located is also equal to the product of the projection ratio of the optical engine 1 and the width of the display area on the projection screen 2.

[0063] Among them, since the projection ratio is a performance parameter of the optical engine 1 itself, the projection ratio of the optical engine 1 is related to the selected optical engine 1. That is, if different optical engines 1 are selected, the projection ratios are different, and further the vertical distance from the center point of the first light-transmitting area 51 to the plane where the projection screen 2 is located is also different. In this way, in the actual setting process, the vertical distance from the center point of the first light-transmitting area 51 to the plane where the projection screen 2 is located is calculated through the projection ratio of the optical engine 1 and the width of the display area, so as to ensure that the light beam emitted by the optical engine 1 can be completely projected onto the display area of the screen.

[0064] Furthermore, when the first housing 5 and the optical engine 1 are located directly below or directly above the projection screen 2, the distances from the center point of the first light-transmitting area 51 to the two side edges in the vertical direction of the projection screen 2 are equal. In this way, it can be ensured that the projection formed by the light beam emitted by the optical engine 1 is located in the central area of the projection screen 2.

[0065] In some embodiments, the projection screen 2 includes a rear housing and a screen sheet. The rear housing is located on the side of the screen sheet away from the optical engine 1, and the rear housing is connected to the connecting frame 3. The screen sheet is an optical screen sheet. For example, the optical screen sheet is a Fresnel optical screen or a black grid screen. Such an optical screen sheet has a higher optical gain compared to a traditional screen, and can restore the brightness and contrast of the light beam as much as possible.

[0066] Optionally, the rear housing is a metal backplane or an internal support of the projection screen 2. After the rear housing is connected to the connecting frame 3, it can fix the screen sheet to realize the support of the connecting frame 3 for the screen sheet. The rear housing can also be a sheet metal frame that supports the four sides of the screen sheet, and the connecting frame 3 can be connected to the sheet metal frames on both sides to support the screen sheet. Among them, the rear housing is fixedly connected to the screen sheet by screws.

[0067] In the embodiments of the present application, the functional component 4 includes different structures.

[0068] In some embodiments, the functional component 4 includes a control main board 43, which is located in the first housing 5 and is electrically connected to the optical engine 1. The control main board 43 is a television (TV) main board and has external hardware interfaces capable of connecting to a computer, a mobile phone, a USB flash drive, etc. The control main board 43 can receive audio and video signals transmitted from a computer, a mobile phone, a USB flash drive, etc., decode the audio and video signals to obtain video signals, and then transmit the video signals to the optical engine 1.

[0069] In some embodiments, the functional component 4 includes a remote controller, which is located in the first housing 5 and is electrically connected to the control main board 43. The remote controller can transmit a remote control signal to the control main board 43, and then the control main board 43 controls the switching of the display screen imaged by the optical engine 1 based on the remote control signal. Among them, the remote controller includes buttons, and the buttons are electrically connected to the control main board 43. The buttons include a power button, volume buttons, etc., and the buttons are physical buttons or virtual buttons.

[0070] Optionally, the functional component 4 further includes a speaker 44, a display board 45, a power board 46, etc. The control main board 43 is electrically connected to the speaker 44, the display board 45, and the power board 46 respectively. The control main board 43 can decode the received audio and video signals to obtain audio signals, and then transmit the decoded audio signals to the speaker 44 for audio playback, so as to meet the audio-visual needs of users; transmit the decoded video signals to the display board 45, and the display board 45 converts the video signals into drive signals and then transmits them to the DMD board included in the optical engine 1, so that the DMD board drives the micromirrors on the DMD to deflect based on the drive signals.

[0071] The power board 46 can output voltage or current drive signals, thereby facilitating the power supply for devices such as the control main board 43, the display board 45, the speaker 44, and the remote controller. In addition, the power board 46 is also connected to the optical engine 1 through a wire. Optionally, the wire is embedded in the connecting frame 3 to save space and increase the aesthetic appearance of the laser projection device at the same time.

[0072] When the optical engine 1 includes a light valve, the power board 46 can supply power to the light valve. In the actual implementation process, since the electrical signals (such as the magnitude of current and voltage) for operating the light valve may be different from the electrical signals provided by the power board 46, the electrical signals transmitted by the power board 46 are transmitted to the light valve through the light valve driver board 122.

[0073] Optionally, the functional component 4 includes a wireless module, and the wireless module is electrically connected to the control main board 43. The wireless module includes a Bluetooth module and / or a WIFI (Wireless-Fidelity) module. Among them, the WIFI module is used to connect the laser projection device to the wireless Internet.

[0074] In some embodiments, the functional component 4 is located on the connecting frame 3. At this time, there is a support plate on the connecting frame 3, and the functional component 4 is located on the support plate. Of course, the functional component 4 can also be arranged on the connecting frame 3 in other ways, as long as the connecting frame 3 can stably carry the functional component 4.

[0075] In other embodiments, when the projection screen 2 includes a rear case and a screen sheet, the functional component 4 is located on the back of the rear case, that is, on the back of the projection screen 2. In addition, the rear case can also cover the functional component 4, and of course, it can also be arranged without overlapping with the functional component 4. By way of example, as Figure 2 shown, the control main board 43, the speaker 44, and the power board 46 included in the functional component are all arranged on the back of the support frame.

[0076] In other embodiments, when the optical engine 1 includes the first housing 5, the functional component 4 is arranged inside the first housing 5. In this way, the position of the functional component 4 is closer to the optical engine 1, facilitating the connection between the functional component 4 and the optical engine 1; in addition, since the functional component 4 is hidden inside the first housing 5, the aesthetics of the laser projection device can be improved.

[0077] In other embodiments, as Figure 7 shown, the laser projection device further includes a second housing 6, the second housing 6 is connected to the first side of the connecting frame 3, and the functional component 4 is located inside the second housing 6. In this way, compared with being arranged inside the first housing 5, it can ensure that the functional component 4 has a larger accommodation space, and compared with being arranged on the connecting frame 3, it can avoid the exposure of the functional component 4.

[0078] In still other embodiments, as Figure 8 shown, the laser projection device further includes a third housing 7 and a fourth housing 8, the third housing 7 and the fourth housing 8 are located on two opposite sides of the first housing 5, and both the third housing 7 and the fourth housing 8 are connected to the first side of the connecting frame 3; the functional component 4 includes a first sub-functional component 41 and a second sub-functional component 42, the first sub-functional component 41 is located inside the third housing 7, and the second sub-functional component 42 is located inside the fourth housing 8.

[0079] Optionally, the third housing 7, the first housing 5, and the fourth housing 8 form a T-shaped structure in a direction perpendicular to the plane where the projection screen 2 is located. The connection between the third housing 7 and the first housing 5, and the connection between the fourth housing 8 and the first housing 5 are both fixed connections or simple contacts. The third housing 7 and the fourth housing 8 have the same shape and volume, so that the aesthetics of the first housing 5 and the third housing 7 and the fourth housing 8 fixed together on two opposite sides of the first housing 5 can be ensured.

[0080] It should be noted that, in addition to the above five placement positions of the functional component 4, combinations of the above five placement positions can also be made based on the various devices included in the functional component 4, and the embodiments of the present application do not limit this.

[0081] Exemplarily, as Figure 2 shown, the display board 45 is arranged on the connecting frame 3, or, as Figure 9 shown, the display board 45 is arranged in the first housing 5. As Figure 2 shown, the control main board 43, the speaker 44 and the power board 46 are all arranged on the back of the projection screen 2; or, as Figure 7 shown, the control main board 43 and the power board 46 are arranged on the connecting frame 3, and the speaker 44 is arranged in the second housing 6; or, as Figure 8 shown, the control main board 43 and the power board 46 are arranged on the connecting frame 3.

[0082] The functional component 4 provided by the embodiments of the present application includes one or more of the above structures. Compared with the prior art in which the functional component 4 is installed in the first housing 5, in the laser projection device provided by the embodiments of the present application, the functional component 4 is installed on the back of the projection screen 2 or the connecting frame 3, or in the second housing 6, the third housing 7, or the fourth housing 8, which can reduce the volume of the first housing 5 and improve the electromagnetic compatibility (EMC) between the functional components 4 (such as the wireless module, the control main board 43, and the power board 46). In addition, in the prior art, installing the functional component 4 in the first housing 5 makes it more troublesome to update the control main board 43. When using the laser projection device provided by the embodiments of the present application, the control main board can be installed on the back of the projection screen 2, which is more convenient to update the control main board 43. Installing the functional component 4 on the back of the projection screen 12 or the connecting frame 3 can improve the heat dissipation channel of the optical engine 1, reduce the power of the optical engine 1, thereby reducing the noise of the optical engine 1 and improving the heat dissipation efficiency of the optical engine 1.

[0083] Compared with the laser projection device in the prior art, the internal components of the first housing 5 provided by the embodiments of the present application are reduced, so that the wiring of the internal components of the first housing 5 is relatively simple, which can improve the production efficiency of the laser projection device. The production of the projection screen 2 installed with the functional component 4 can refer to the production process of the TV screen in the prior art, so that the production efficiency of the laser projection device can be further improved.

[0084] When the laser projection device includes the second housing 6, in some embodiments, the first housing 5 is fixed within the second housing 6. The second housing 6 has a second light-transmitting area at a corresponding position of the first light-transmitting area 51 of the first housing 5. The light beam emitted by the optical engine 1 can pass through the first light-transmitting area 51 and the second light-transmitting area and be emitted to the projection screen 2. In this way, the positions of the first housing 5 and the second housing 6 are more compact, which is conducive to the connection between the functional components 4 provided in the second housing 6 and the optical engine 1 provided in the first housing 5. The second light-transmitting area corresponding to the first light-transmitting area 51 facilitates the emission of the light beam of the optical engine 1.

[0085] In some other embodiments, the first housing 5 is connected to the second housing 6, and the first housing 5 can be switched between two states: being received within the second housing 6 and extending outside the second housing 6. In this way, it is possible to facilitate reducing the size of the second housing 6 in the direction perpendicular to the projection screen. Furthermore, when the light beam emitted by the optical engine 1 is not required, the first housing 5 can be received within the second housing 6, which can save space.

[0086] Optionally, the inner wall of the second housing 6 has a guide rail. Correspondingly, the outer wall of the first housing 5 has a slider, and the slider can slide relative to the guide rail. In this way, the first housing 5 moves along the guide rail provided within the second housing 6 based on the slider to achieve the first housing 5 being received within the second housing 6 and extending outside the second housing 6.

[0087] Furthermore, a limiting mechanism is also provided on the second housing 6 to limit the first housing 5 extending outside the second housing 6, so as to ensure that the vertical distance from the center point of the first light-transmitting area 51 on the extended first housing 5 to the plane where the projection screen 2 is located meets the projection requirements of the optical engine 1.

[0088] Optionally, the laser projection device further includes a control mechanism. The control mechanism is located within the second housing 6 and is used to control the first housing 5 to be received within the second housing 6 or extend outside the second housing 6. In this way, automatic control of the first housing 5 can be achieved, and the movement accuracy of the first housing 5 can be ensured, thereby ensuring the projection effect of the light beam emitted by the optical engine 1.

[0089] Among them, the specific structure of the control mechanism is a lead screw type control mechanism, or other forms of control mechanisms. The specific structure refers to related technologies, and this application embodiment will not elaborate on it here.

[0090] In some embodiments, as Figure 2 and Figure 7 shown, the laser projection device further includes a radiator, and the radiator includes a water-cooled radiator 9 and an air-cooled radiator 10.

[0091] Optionally, the water-cooled radiator 9 mainly includes heat dissipation pipelines. The ends of the heat dissipation pipelines extend into the first housing 5 and are connected to the optical engine 1. At the same time, the heat dissipation pipelines are laid on the back of the projection screen 2 or placed in the third housing 7 or the fourth housing 8. In this way, the water-cooled radiator 9 can dissipate heat from the optical engine 1. Since only part of the pipelines of the water-cooled radiator 9 extend into the first housing 5, the space inside the first housing 5 can be saved, which is beneficial to the miniaturized design of the laser projection device.

[0092] Optionally, when the radiator includes an air-cooled radiator 10, the optical engine 1 has a heat dissipation channel. The air-cooled radiator 10 is located inside the first housing 5, or inside the third housing 7 or the fourth housing 8. At the same time, the air outlet of the air-cooled radiator 10 is connected to the heat dissipation channel of the optical engine 1. In this way, the air-cooled radiator 10 can dissipate heat from the optical engine 1; when the air-cooled radiator 10 is located inside the third housing 7 or the fourth housing 8, the space inside the first housing 5 can also be saved.

[0093] Next, the structure of the connecting frame 3 will be explained in detail.

[0094] In some embodiments, as Figure 2 shown, the connecting frame 3 includes a plurality of connecting rods 31. The first end of each connecting rod 31 is connected to the projection screen 2, and the second end of each connecting rod 31 is connected to the optical engine 1. In this way, the plurality of connecting rods 31 can connect the projection screen 2 and the optical engine 1 more firmly.

[0095] Optionally, the plurality of connecting rods 31 are evenly distributed, so as to ensure that the supporting force of the connecting frame 3 for supporting the projection screen 2 and the optical engine 1 is evenly distributed on the projection screen 2 and the optical engine 1.

[0096] Among them, on the projection plane parallel to the projection screen 2, when the optical engine 1 is located directly below the projection screen 2 and the width of the surface where the light-emitting side of the optical engine 1 is located is equal to the width of the projection screen 2, the connecting frame 3 formed by the plurality of connecting rods 31 is a rectangular structure. When the width of the surface where the light-emitting side of the optical engine 1 is located is less than the width of the projection screen 2, the connecting frame 3 formed by the plurality of connecting rods 31 is an inverted trapezoidal structure.

[0097] Optionally, there is a fixed connection between the first end of each connecting rod 31 and the projection screen 2, and between the second end of each connecting rod 31 and the optical engine 1. The multiple connecting rods 31 are all telescopic rods and are parallel to each other. In this way, after each connecting rod 31 is telescoped, the relative height relationship between the projection screen 2 and the optical engine 1 can be adjusted, so as to adjust the height of the center point of the first light-transmitting area 51 included in the optical engine 1 relative to the projection screen 2, and the angle between the line connecting the center point of the first light-transmitting area 51 and the center point of the projection screen 2 and the vertical direction, so that the projection screen 2 can adapt to the angle requirements of the light beams emitted by different optical engines 1.

[0098] Further, when the optical engine 1 finishes being used, the vertical distance between the optical engine 1 and the projection screen 2 is shortened by the shortening effect of the multiple connecting rods 31, thereby reducing the overall size after the optical engine 1 and the projection screen 2 are connected.

[0099] Optionally, the shape of the connecting rod 31 is linear. The second end of the connecting rod 31 is connected to a position on the light-emitting side of the optical engine 1 close to the projection screen 2, or is connected to a side of the optical engine 1 close to the projection screen 2, so as to achieve a stable connection between the optical engine 1 and the projection screen 2.

[0100] Of course, in some other embodiments, the shape of the connecting rod 31 is L-shaped. At this time, the connecting rod 31 includes two perpendicular struts. Optionally, the strut corresponding to the first end of the connecting rod 31 is simultaneously connected to both the projection screen 2 and a side of the optical engine 1 close to the projection screen 2, and the strut corresponding to the second end of the connecting rod 31 is connected to a side of the optical engine 1 opposite to the light-emitting side.

[0101] Among them, when the strut corresponding to the second end of the connecting rod 31 is connected to a side of the optical engine 1 opposite to the light-emitting side, the connecting rod 31 can support the optical engine 1, thereby achieving more stable support for the optical engine 1.

[0102] It should be noted that when the L-shaped connecting rod 31 is a telescopic rod, both of the two struts included in the connecting rod 31 are telescopic rods. In this way, after the two struts included in the connecting rod 31 are telescoped, the relative height relationship between the optical engine 1 and the projection screen 2 can be adjusted simultaneously, and the vertical distance from the center point of the first light-transmitting area 51 to the plane where the projection screen 2 is located can be adjusted, thereby further reducing the overall size after the optical engine 1 and the projection screen 2 are connected.

[0103] Optionally, the connecting frame 3 further includes a first connecting rod, the first connecting rod is fixedly connected to the projection screen 2, and the first end of each connecting rod 31 is fixedly connected to the first connecting rod. In this way, when the projection screen 2 is fixedly connected to the support body, each connecting rod 31 and the optical engine 1 will apply a pulling force to the first connecting rod due to their own gravity, and this pulling force is evenly distributed on the projection screen 2 through the first connecting rod, thereby being able to avoid the problem that the projection screen 2 is deformed due to stress concentration.

[0104] In addition, the connecting frame 3 further includes a second connecting rod, the second connecting rod is fixedly connected to the optical engine 1, and the second end of each connecting rod 31 is fixedly connected to the second connecting rod. For the same reason as above, the second connecting rod can evenly distribute the pulling force it receives on the optical engine 1 to achieve a more stable connection of the optical engine 1.

[0105] In some embodiments, the connecting frame 3 further includes a plurality of support rods 32, the plurality of support rods 32 are fixed on the back surface of the projection screen 2, and one end of the support rod 32 is fixedly connected to the first end of the connecting rod 31. In this way, through the support rod 32, not only can the connecting frame 3 be fixedly connected to the projection screen 2, but also the projection screen 2 can be supported, thereby improving the stability of the connection between the projection screen 2 and the optical engine 1.

[0106] Optionally, as Figure 2 shown, each support rod 32 is a straight support rod. In this way, the straight support rod can support the projection screen 2 along its own straight line direction. The support rod 32 can be directly connected or indirectly connected to the first end of the connecting rod 31, and the embodiments of the present application do not limit this.

[0107] Optionally, as Figure 7 shown, each support rod 32 is an L-shaped support rod. One side of the L-shaped support rod is fixedly connected to both the projection screen 2 and the optical engine 1 at the same time, and the other side of the L-shaped support rod supports on the bottom surface of the optical engine 1 and is fixedly connected to the optical engine 1. In this way, when the projection screen 2 is fixed to the support body (wall or fixed bracket), the L-shaped support rod can support the optical engine 1, or when the optical engine 1 is fixed to the support body (support cabinet or desktop), the L-shaped support rod can support the projection screen 2.

[0108] Next, a detailed introduction will be made to the solution where the optical engine is rotatable.

[0109] In some embodiments, the optical engine can rotate relative to the connecting frame so that the angle between the light-emitting side of the optical engine and the projection screen can be switched between a first reference angle and a second reference angle to achieve the retraction or lowering of the optical engine; at least one of the projection screen and the connecting frame is used for being fixedly connected to the support body.

[0110] In the embodiments of the present application, since the optical engine can be switched between a retracted state and a deployed state, the projection function of the optical engine is ensured, and the overall size of the laser projection device is reduced when the optical engine is not in use.

[0111] In the embodiments of the present application, the rotation of the optical engine can be achieved manually. Of course, in some other embodiments, the rotation of the optical engine can also be achieved through a control mechanism. Compared with manual control, the control mechanism has higher control precision, and the control mechanism can control the optical engine to stop at any position, thus avoiding the setting of a limiting mechanism and reducing the complexity of the structure.

[0112] Optionally, when the rotation of the optical engine is achieved manually, a limiting groove is provided at the position where the optical engine is connected to the connecting frame. In this way, the limiting groove can limit the extreme position of the rotation of the optical engine to achieve positioning after the optical engine rotates to the first reference angle or the second reference angle. Alternatively, the connecting frame includes a bracket extending in a direction perpendicular to the projection screen, and the bracket is used to support the optical engine when the optical engine is deployed. In this way, the bracket can define the rotation angle of the optical engine, thereby ensuring the accuracy of the rotation of the optical engine.

[0113] Optionally, the bracket has a U-shaped structure, and both ends of the U-shaped bracket are fixedly connected to the connecting frame. In this way, when the optical engine is manually controlled to rotate until the plane where the light-emitting side is located is at a first reference angle with the plane where the projection screen is located, the U-shaped bracket extends in a direction away from the plane where the connecting frame is located, and thus the U-shaped bracket can support the optical engine more stably.

[0114] Optionally, both the connection between the connecting frame and the projection screen and the connection between the connecting frame and the optical engine are detachable. For example, both the connection between the connecting frame and the projection screen and the connection between the connecting frame and the optical engine are connected by screws or pins. In this way, if the projection screen fails, the projection screen can be disassembled and sent for repair separately. If the optical engine fails, the optical engine can be disassembled and sent for repair separately, thus avoiding the inconvenience caused by sending the entire laser projection device for repair.

[0115] Optionally, the first reference angle is 90°, that is, the plane where the light-emitting side of the optical engine is located is perpendicular to the plane where the projection screen is located, and the second reference angle is 0°, that is, the plane where the light-emitting side of the optical engine is located is parallel to the plane where the projection screen is located.

[0116] Generally, the overall shape of the optical engine is a cuboid. When the optical engine is placed for use, that is, when the angle between the plane where the light-emitting side of the optical engine is located and the plane where the projection screen is located is the first reference angle of 90°, the dimension of the optical engine along the direction perpendicular to the plane where the projection screen is located is greater than the dimension of the optical engine along the vertical direction; when the optical engine is retracted to end use, that is, when the optical engine is rotated to the position where the angle between the plane where the light-emitting side is located and the plane where the projection screen is located is the second reference angle of 0°, in this way, the dimension of the optical engine along the direction perpendicular to the plane where the projection screen is located is significantly reduced, thereby reducing the thickness of the entire laser projection device and achieving a miniaturized design of the laser projection device when the optical engine is not in use.

[0117] In some embodiments, the connecting frame has a planar structure. Optionally, the connecting frame includes a plurality of linear connecting rods and a first connecting shaft. The first ends of the plurality of linear connecting rods are fixedly connected to the first connecting shaft, and the second ends of the plurality of linear connecting rods are fixedly connected to the projection screen; the optical engine is rotatably connected to the first connecting shaft.

[0118] Optionally, the optical engine is rotatably connected to the first connecting shaft based on the side edge of the light-emitting side close to the projection screen. In this way, in the direction from right to left of the optical engine, the optical engine rotates clockwise from the position corresponding to the first reference angle shown in the figure to the position corresponding to the second reference angle shown in the figure. Or the optical engine is rotatably connected to the first connecting shaft based on the side edge of the side opposite to the light-emitting side close to the projection screen. In this way, in the direction from right to left of the optical engine, the optical engine can rotate counterclockwise from the position corresponding to the first reference angle to the position corresponding to the second reference angle.

[0119] It should be noted that when the optical engine is located directly below or directly above the projection screen, the side edge in the embodiments of the present application is the side edge along the horizontal direction. When the optical engine is located on the left side or the right side of the projection screen, the side edge in the embodiments of the present application is the side edge along the vertical direction.

[0120] Optionally, the optical engine is connected to the first connecting shaft through a hinge to enable the optical engine to rotate relative to the first connecting shaft. Of course, in some other embodiments, the optical engine has through holes, and further, the optical engine can be rotatably connected to the connecting shaft based on the through holes to achieve the rotation of the optical engine.

[0121] In some embodiments, the plurality of linear connecting rods are all telescopic rods. In this way, after the plurality of linear connecting rods are extended or shortened, the relative height relationship between the projection screen and the optical engine can be adjusted. Furthermore, the height of the light outlet of the optical engine relative to the projection screen can be adjusted, and at the same time, the included angle between the line connecting the center point of the light outlet and the center point of the projection screen and the vertical direction can be adjusted, so as to meet the angle requirements of the light beams emitted by different optical engines. Further, when the optical engine is not in use, the vertical distance between the optical engine and the projection screen can be reduced by shortening the plurality of linear connecting rods, thereby reducing the overall size after the optical engine and the projection screen are connected.

[0122] In other embodiments, the connecting frame has a structure with an L-shaped cross-section. In this way, the connecting frame has an extension dimension in the direction perpendicular to the projection screen, so that it is convenient to adjust the dimension between the optical engine connected to the connecting frame and the projection screen in the direction perpendicular to the projection screen.

[0123] Optionally, the connecting frame includes a plurality of L-shaped connecting rods and a second connecting shaft. The first ends of the plurality of L-shaped connecting rods are fixedly connected to the second connecting shaft, the second ends of the plurality of L-shaped connecting rods are fixedly connected to the projection screen, and the optical engine is rotatably connected to the second connecting shaft. Wherein, the first end of the L-shaped connecting rod is the end of one branch of the L-shaped connecting rod, and the second end of the L-shaped connecting rod is the end of the other branch of the L-shaped connecting rod.

[0124] Wherein, when the overall shape of the optical engine is a cuboid, the optical engine can not only be rotatably connected to the second connecting shaft based on the side edge close to the projection screen on its light-emitting side, but also be rotatably connected to the second connecting shaft based on the middle part of the optical engine in the direction perpendicular to the projection screen or the side wall of the optical engine on the side opposite to the light-emitting side.

[0125] It should be noted that when the optical engine is rotatably connected to the second connecting shaft based on its middle part in the direction perpendicular to the projection screen, the number of L-shaped connecting rods included in the connecting frame is two, and the first ends of the two L-shaped connecting rods are respectively fixedly connected to both ends of the second connecting shaft. In this way, the optical engine located between the two L-shaped connecting rods can be rotatably connected to the second connecting shaft based on its middle part in the direction perpendicular to the projection screen.

[0126] When the optical engine is rotatably connected to the second connecting shaft based on the side edge of its light-emitting side close to the side edge of the projection screen, the connection method and rotation method between the optical engine and the second connecting shaft are the same as or similar to the connection method and rotation method between the optical engine and the first connecting shaft in the previous embodiment. When the optical engine is rotatably connected to the second connecting shaft based on the middle part of the optical engine in the vertical direction of the projection screen, the optical engine can not only rotate clockwise from the position corresponding to the first reference angle to the position corresponding to the second reference angle, but also rotate counterclockwise from the position corresponding to the first reference angle to the position corresponding to the second reference angle. Similarly, when the optical engine is rotatably connected to the second connecting shaft based on the side wall of the optical engine on the side opposite to the light-emitting side, the optical engine can not only rotate clockwise from the position corresponding to the first reference angle to the position corresponding to the second reference angle, but also rotate counterclockwise from the position corresponding to the first reference angle to the position corresponding to the second reference angle.

[0127] Optionally, the struts of the plurality of L-shaped connecting rods parallel to the projection screen are all telescopic rods. In this way, the beneficial effects of the plurality of telescopic L-shaped connecting rods are similar to those of the plurality of telescopic linear connecting rods described above, and the embodiments of the present application will not elaborate on this.

[0128] Optionally, the struts of the plurality of L-shaped connecting rods perpendicular to the projection screen are also telescopic rods. In this way, it is convenient to adjust the vertical distance from the light-emitting port of the optical engine to the plane where the projection screen is located, and it can also adjust the angle between the line connecting the center point of the light-emitting port and the center point of the projection screen and the vertical direction.

[0129] In this way, when the optical engine is no longer in use, not only can the vertical distance between the optical engine and the projection screen be shortened through the connecting frame, but also the vertical distance from the optical engine to the projection screen can be shortened through the connecting frame, thereby significantly reducing the overall size after the optical engine and the projection screen are connected.

[0130] In some embodiments, when the connecting frame includes a plurality of support rods, the plurality of support rods are fixed to the back surface of the projection screen, and one end of the support rod can also be fixedly connected to the second end of the L-shaped connecting rod. In this way, the support rod can also support the projection screen to improve the connection stability between the projection screen and the optical engine.

[0131] Next, a detailed introduction will be made to the solution in which the first housing can be switched between two states of being received in the second housing and extending out of the second housing.

[0132] [[ID=ID=18]]In some embodiments, the laser projection device further includes a moving component, the moving component is limited in the inner cavity of the second housing, the first housing is connected to the moving component, and the moving component can drive the first housing to switch between two states of being received in the inner cavity of the second housing and extending out of the second housing.

[0133] In the embodiments of the present application, driven by the moving component, the first housing can be received into the inner cavity of the first accommodating portion, thereby realizing the retraction of the first housing, and reducing the width of the projection screen and the entire first housing in the direction perpendicular to the plane where the projection screen is located. In addition, the laser projection device is located on the TV cabinet. By using the laser projection device provided in the embodiments of the present application, the width of the TV cabinet can be smaller than the distance between the first housing and the projection screen when the first housing extends out of the second housing. In this way, the laser projection device can be applied to TV cabinets of various specifications.

[0134] In the embodiments of the present application, the number of moving components is one or more. The number of moving components is set according to the size of the first housing and the force on the first housing in the actual situation. The embodiments of the present application will not elaborate on this.

[0135] In some embodiments, the moving component includes a moving part and a limiting part; the moving part is connected to the first housing, the limiting part is limited in the inner cavity of the second housing, the moving part is in transmission connection with the limiting part, and the moving part can slide relative to the limiting part, and the sliding direction is not parallel to the plane where the projection screen is located. In this way, when the moving part slides relative to the limiting part, the first housing connected to the moving part can slide relative to the limiting part, thereby realizing the sliding of the first housing relative to the second housing.

[0136] Furthermore, since the sliding direction is not parallel to the plane where the projection screen is located, the first housing can slide in the direction close to or away from the projection screen. Exemplarily, the sliding direction of the moving part is perpendicular to the plane where the projection screen is located when unfolded. In this way, the moving part can approach or move away from the projection screen more efficiently.

[0137] In some embodiments, the moving part includes a rack, and the limiting part includes a gear. The gear is rotatably limited in the inner cavity of the second housing, and the gear meshes with the rack. In this way, when the gear rotates, it can roll along the rack, thereby realizing the movement of the first housing connected to the rack relative to the gear, and at the same time realizing the movement of the first housing relative to the second housing.

[0138] Optionally, the moving part further includes a first rotating shaft, and the first rotating shaft is rotatably limited in the inner cavity of the second housing. The gear is fixedly connected to the first rotating shaft along its own axial direction, and the axial direction of the gear is collinear with the axial direction of the first rotating shaft. In this way, the gear can be rotatably limited in the inner cavity of the second housing. In addition, the rack is fixedly connected to the first housing.

[0139] In some other embodiments, the moving part includes a gear, the gear is rotatably limited on the first housing, the limiting part includes a rack, and the gear meshes with the rack. In this way, when the gear rotates, it can roll along the rack, thereby realizing the movement of the first housing connected to the gear relative to the rack, and at the same time realizing the movement of the first housing relative to the second housing.

[0140] Optionally, the rack is fixedly connected to the inner wall of the second housing. The limiting manner of the gear on the first housing is the same as or similar to the limiting manner of the gear in the inner cavity of the second housing in the above embodiment, and this application embodiment will not elaborate on this.

[0141] Optionally, in the above two parallel embodiments, the length direction of the rack is perpendicular to the plane where the projection screen is located. In this way, since the gear rolls along the length direction of the rack, the first housing connected to the gear or the rack moves along the length direction of the rack, so that the first housing can move in a direction perpendicular to the plane where the projection screen is located. In this way, the first housing can approach or move away from the projection screen more efficiently.

[0142] Optionally, in the above two parallel embodiments, the number of gears corresponding to the rack is one or more. When the number of gears is multiple, the stability of the first housing can be enhanced.

[0143] In some other embodiments, the moving member includes a roller, the roller is rotatably limited on the first housing, the limiting member includes a rolling groove, the roller is limited in the rolling groove, and the roller can roll in the rolling groove. In this way, when the roller rolls in the rolling groove, the first housing connected to the roller can move relative to the rolling groove, and at the same time, it is also the movement of the first housing relative to the second housing.

[0144] Optionally, the moving member further includes a second rotating shaft, the second rotating shaft is rotatably limited on the first housing, the roller is fixedly connected to the second rotating shaft along its own axial direction, and the axial direction of the roller is collinear with the axial direction of the second rotating shaft. In this way, the roller can be rotatably limited on the first housing, and the rolling groove is fixedly connected in the second housing.

[0145] In some other embodiments, the moving member includes a rolling groove, the limiting member includes a roller, the roller is rotatably limited in the inner cavity of the second housing, the rolling groove is limited on the roller, and on the basis that the roller can roll in the rolling groove, the rolling groove can move relative to the roller. In this way, the first housing connected to the rolling groove can move relative to the roller, and at the same time, it is also the movement of the first housing relative to the second housing.

[0146] Optionally, the rolling groove is fixedly connected to the first housing, and the limiting manner of the roller in the inner cavity of the second housing is the same as or similar to the limiting manner of the roller on the first housing, and this application embodiment will not elaborate on this.

[0147] Optionally, in the above two parallel embodiments, the length direction of the rolling groove is perpendicular to the plane where the projection screen is located. In this way, since the roller rolls along the length direction of the rolling groove, the first housing connected to the roller or the rolling groove moves along the length direction of the rolling groove, so that the first housing can move in a direction perpendicular to the plane where the projection screen is located. In this way, the first housing can approach or move away from the projection screen more efficiently.

[0148] Optionally, in the above two parallel embodiments, the number of rollers corresponding to the rolling groove is also one or more. When the number of rollers is multiple, the stability of the first housing can be enhanced.

[0149] In the embodiments of the present application, the movement of the first housing can be realized by manually pushing or pulling the first housing or by electrically driving the first housing.

[0150] In some embodiments, in the actual implementation of manually pushing or pulling the first housing, when the moving member includes a gear and the limiting member includes a rack, after the first housing is subjected to an external pulling force, the rack connected to the first housing will cause the gear to roll relative to the rack, and then, with the cooperation of the gear and the rack, the first housing can extend out of the inner cavity of the second housing more smoothly; similarly, after the first housing is subjected to an external pushing force, it can be more smoothly received in the inner cavity of the second housing.

[0151] In some other embodiments, the laser projection device further includes a driving mechanism, which is connected to the moving component, and the driving mechanism can drive the first housing to switch between two states of being received in the inner cavity of the second housing and extending out of the second housing through the moving component. In this way, the driving mechanism can realize the automatic control when the first housing moves.

[0152] Optionally, when the moving member includes a gear and the limiting member includes a bar, the driving mechanism includes a driving motor. The driving motor is fixedly connected to the first housing, the gear is fixedly connected to the output shaft of the driving motor along its own axial direction, and the axial direction of the gear is collinear with the output shaft of the driving motor. In this way, after the driving motor is started, it can control the rotation of the gear, and then when the gear rotates, it can roll along the rack, so that the gear can drive the first housing to move along the rack.

[0153] Optionally, when the moving member includes rollers and the limiting member includes rolling grooves, the driving mechanism includes a driving motor, a driving wheel, and a driven wheel. The driving motor is fixedly connected to the first housing. The driving wheel is fixedly connected to the output shaft of the driving motor along its own axial direction, and the axial direction of the driving wheel is collinear with the output shaft of the driving motor. The driven wheel is fixedly connected to the second rotating shaft along its own axial direction, and the axial direction of the driven wheel is collinear with the axial direction of the second rotating shaft. The driving wheel meshes with the driven wheel. In this way, after the driving motor is started, it can drive the driving wheel to rotate. At the same time, the driving wheel drives the driven wheel meshing with it to rotate together, and then the second rotating shaft fixedly connected to the driven wheel rotates together to realize the rotation of the rollers.

[0154] Furthermore, the laser projection device further includes a control system, and the control system is electrically connected to the driving motor. When it is necessary to control the first housing to extend out of the second housing, the control system sends a start command to the driving motor to control the driving motor to start running. Then the driving motor drives the moving component to operate so that the moving component can drive the first housing to extend out of the second housing. When the first housing extends out of the second housing to an appropriate projection position, the control system sends a stop command to the driving motor to control the driving motor to stop running, and then the first housing stops moving. It can be seen from this that the control system can control the start and stop of the driving motor according to the actual position of the first housing, and thus can ensure the accuracy of the moving amount of the first housing.

[0155] In some embodiments, the laser projection device further includes a guide bar; the guide bar is fixed on one of the inner cavities of the first housing and the second housing, and the length direction of the guide bar is parallel to the moving direction of the first housing; the other of the first housing and the second housing has a guide groove, and the guide bar is limited in the guide groove and can slide relative to the guide groove.

[0156] In this way, the mutual cooperation of the guide bar and the guide groove can ensure that the first housing moves along a fixed moving direction and is not prone to skew. Further, when both the guide groove and the guide bar are located on the bottom surface of the first housing, the guide bar or the guide groove located in the second housing can support the first housing, thereby enhancing the stability of the first housing limited in the second housing.

[0157] Optionally, the guiding bar has a hollow long strip structure. Correspondingly, the laser projection device further includes a limit screw. When the guiding bar is fixed in the inner cavity of the second housing, the guiding bar has a through hole, and the guiding groove has a first limit hole and a second limit hole. When the first housing is received into the inner cavity of the second housing, the limit screw can extend into the hollow cavity of the guiding bar, and then pass through the through hole and be fixed in the first limit hole to limit the position of the first housing; when the first housing extends out of the second housing, the limit screw is used to pass through the through hole and be fixed in the second limit hole to limit the position of the first housing. In this way, after the first housing is received into the inner cavity of the second housing, it can maintain a retracted state. After the first housing extends out of the second housing, it can maintain an extended state and can maintain a fixed projection position.

[0158] In some embodiments, the laser projection device further includes a limit boss, and the limit boss is fixedly connected to one of the first housing and the second housing; the other of the first housing and the second housing has a limit groove, and the length direction of the limit groove is parallel to the moving direction of the first housing.

[0159] In this way, during the movement of the first housing relative to the second housing, when the limit boss abuts against the end of the limit groove, the continuous movement of the first housing can be blocked. Therefore, it is convenient to control the positioning of the first housing after it is received into the second housing and ensure the stability after the first housing is retracted; in addition, it is convenient to control the positioning of the first housing after it extends out of the second housing, and thus it is convenient for the first housing to maintain a fixed projection position.

[0160] It should be noted that the length of the limit groove is set according to the moving distance of the first housing. Specifically, the length setting of the limit groove can ensure that when the limit boss moves from one end of the limit groove to the other end of the limit groove, the first housing can extend out of the second housing and move to an accurate projection position, or the first housing can be received from the accurate projection position into the inner cavity of the second housing.

[0161] In the embodiments of the present application, the connecting frame can connect the optical engine and the projection screen into a whole based on its first side and second side. Therefore, relative to the projection screen, the optical engine is not likely to be displaced, and further, it can be ensured that the light beam emitted by the optical engine can be projected at the correct position of the projection screen, ensuring a good projection effect. In addition, since the functional components are arranged independently of the optical engine, the overall size of the optical engine is reduced, and further, the miniaturized design of the laser projection device is realized. When the connecting frame includes a plurality of telescopic connecting rods, the relative position relationship between the projection screen and the optical engine can be adjusted after the connecting rods are telescoped to meet the requirements of the light projection angles of different optical engines. When the first housing is received in the second housing, space can be saved, and when the first housing extends out of the second housing, it is convenient for the optical engine to emit light beams to the projection screen to project a clear picture.

[0162] The foregoing are merely illustrative embodiments of the embodiments of the present application and are not intended to limit the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the embodiments of the present application shall be included within the scope of protection of the embodiments of the present application.

Claims

1. A laser projection device, characterized in that, The laser projection device includes: an optical engine, a projection screen, a connecting frame, and functional components; The optical engine is connected to a first side of the connecting frame, the projection screen is fixedly connected to a second side of the connecting frame, at least one of the optical engine, the projection screen, and the connecting frame is used to be fixedly connected to a support body, and the first side is opposite to the second side; The optical engine is electrically connected to the functional components and can emit a light beam with the cooperation of the functional components; The projection screen is used to receive the light beam emitted by the optical engine to display an image; The connecting frame includes a plurality of connecting rods, a first end of each connecting rod is connected to the projection screen, and a second end of each connecting rod is connected to the optical engine; The connecting frame includes a plurality of support rods, the plurality of support rods are fixed on the back of the projection screen, and one end of the support rod is fixedly connected to the first end of the connecting rod. Each support rod is an L-shaped support rod. One side of the L-shaped support rod is fixedly connected to both the back of the projection screen and a side of the optical engine close to the projection screen, and the other side of the L-shaped support rod supports on the bottom surface of the optical engine and is fixedly connected to the optical engine.

2. The laser projection device according to claim 1, characterized in that, The plurality of connecting rods are all telescopic rods.

3. The laser projection device according to claim 1 or 2, characterized in that, The laser projection device includes a first housing; The first housing is connected to the first side of the connecting frame, a first light-transmitting area is provided on the housing wall of the first housing, the optical engine is located inside the first housing, and the light beam emitted by the optical engine can pass through the first light-transmitting area and be emitted to the projection screen.

4. The laser projection device according to claim 3, wherein The laser projection device further includes a second housing, the second housing is connected to the first side of the connecting frame, and the functional components are located inside the second housing.

5. The laser projection device according to claim 4, wherein The first housing is fixed inside the second housing, and a second light-transmitting area is provided at a corresponding position of the second housing in the first light-transmitting area. The light beam emitted by the optical engine can pass through the first light-transmitting area and the second light-transmitting area and be emitted to the projection screen.

6. The laser projection device according to claim 4, characterized in that, The first housing is connected to the second housing, and the first housing can be switched between two states of being housed inside the second housing and extending outside the second housing.

7. The laser projection device according to claim 3, characterized in that, The laser projection device further includes a third housing and a fourth housing; The third housing and the fourth housing are located on two opposite sides of the first housing, and both the third housing and the fourth housing are connected to the first side of the connecting frame; The functional components include a first sub-functional component and a second sub-functional component, the first sub-functional component is located inside the third housing, and the second sub-functional component is located inside the fourth housing.

8. The laser projection device according to claim 3, wherein The functional components include a control main board, the control main board is located inside the first housing, and the control main board is electrically connected to the optical engine.

9. The laser projection device according to claim 8, wherein, The functional components include a remote controller, the remote controller is located inside the first housing, and the remote controller is electrically connected to the control main board.

10. The laser projection device according to claim 9, wherein, The remote controller includes keys, and the keys are electrically connected to the control main board.

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