Power-on Control Method and Power-off Control Method of Projection Device

Abstract

The embodiments of the present application disclose a power-on control method and a power-off control method for a projection device, belonging to the field of projection technology. The method includes: after the controller controls the power module to be respectively conducted with the projection display module and the screen lifting module, sending a first control instruction to the screen lifting module; when it is determined based on the first control instruction that the projection screen rises to a first preset height, sending a second control instruction to the screen lifting module; then the controller outputs a power-on screen to the projection display module according to a pre-stored rising curve segment, and sends a third control instruction to the projection display module, and at the same time sends a fourth control instruction to the screen lifting module; when the controller determines that the projection screen rises to a second preset height, sending a second control instruction to the screen lifting module. In the embodiments of the present application, the controller can simultaneously control the projection display module and the screen lifting module, thereby ensuring the synchronization between the power-on screen and the lifting of the projection screen, and improving the display effect of the projection device.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of projection technology, and in particular to a method for controlling the startup and shutdown of a projection device. Background Art

[0002] With the continuous development of technology, projection devices are increasingly applied in people's work and life. Currently, projection devices mainly include an optical engine and a projection screen. Among them, the light outlet of the optical engine faces the projection screen to emit a light beam to the projection screen, and the projection screen is used to receive the light beam to realize the display of the picture. Summary of the Invention

[0003] Embodiments of the present application provide a method for controlling the startup and shutdown of a projection device, which can ensure the synchronization between the startup screen and the rising of the projection screen during the use of the projection device. The technical solution is as follows:

[0004] A method for controlling the startup of a projection device, the projection device includes a controller, a power module, a projection display module, a screen lifting module, an optical engine and a projection screen, the method is applied to the controller, and the method includes:

[0005] When the controller receives a startup instruction, control the power module to be conducted with the projection display module and the screen lifting module respectively;

[0006] The controller sends a first control instruction to the screen lifting module, and the first control instruction is used to instruct the screen lifting module to control the projection screen to rise;

[0007] When the controller determines that the projection screen has risen to a first preset height, send a second control instruction to the screen lifting module, and the second control instruction is used to instruct the screen lifting module to control the projection screen to stop rising;

[0008] The controller outputs a startup screen to the projection display module according to a pre-stored rising curve segment, sends a third control instruction to the projection display module, and sends a fourth control instruction to the screen lifting module at the same time;

[0009] Among them, the third control instruction is used to instruct the projection display module to control the optical engine to emit a light beam based on the startup screen and pre-stored first light beam information, and the fourth control instruction is used to instruct the screen lifting module to control the projection screen to continue rising according to the pre-stored rising curve segment;

[0010] When the controller determines that the projection screen has risen to a second preset height, send the second control instruction to the screen lifting module.

[0011] Optionally, the projection device further includes a first trigger switch. The controller determines that the projection screen rises to a first preset height, including:

[0012] When the controller receives a first trigger signal sent by the screen lifting module, the controller determines that the projection screen rises to the first preset height;

[0013] Wherein, the first trigger signal is triggered by the first trigger switch when the projection screen rises to the first preset height and sent to the screen lifting module.

[0014] Optionally, the projection screen includes a lifting motor, and the projection device further includes an encoder. The controller determines that the projection screen rises to a first preset height, including:

[0015] The controller receives a first rising height of the projection screen transmitted by the screen lifting module, and the first rising height is determined by the screen lifting module based on a first rotation angle of the lifting motor detected by the encoder;

[0016] When the first rising height is equal to the first preset height, the controller determines that the projection screen rises to the first preset height.

[0017] Optionally, after the controller sends a fourth control instruction to the screen lifting module, it further includes:

[0018] The controller receives a second rising height of the projection screen transmitted by the screen lifting module, and the second rising height is determined by the screen lifting module based on a second rotation angle of the lifting motor detected by the encoder;

[0019] The controller determines a third rising height of the startup screen according to the rising curve segment;

[0020] When the difference between the second rising height and the third rising height is greater than a difference threshold, the controller adjusts the rising speed of the startup screen and outputs the startup screen to the projection display module at the adjusted rising speed, and then returns to the step where the controller receives the second rising height of the projection screen transmitted by the screen lifting module;

[0021] When the difference between the second rising height and the third rising height is less than or equal to the difference threshold, the controller continues to output the startup screen to the projection display module according to the rising curve segment.

[0022] Optionally, the projection device further includes a storage part, a flip cover transmission mechanism, a sliding cover transmission mechanism, a second trigger switch, and a third trigger switch. Before the controller sends a first control instruction to the screen lifting module, it further includes:

[0023] The controller sends a fifth control instruction to the screen lifting module so that the controller receives a second trigger signal sent by the screen lifting module;

[0024] The controller sends a sixth control instruction to the projection display module so that the controller receives a third trigger signal sent by the projection display module;

[0025] Wherein, the fifth control instruction is used to instruct the screen lifting module to control the flip cover transmission mechanism to flip, the second trigger signal is triggered by the second trigger switch when the flip cover transmission mechanism avoids the lifting opening of the storage part and sent to the screen lifting module, the sixth control instruction is used to instruct the projection display module to control the sliding cover transmission mechanism to slide, and the third trigger signal is triggered by the third trigger switch when the sliding cover transmission mechanism avoids the light transmission area of the storage part and sent to the projection display module.

[0026] Optionally, the projection device further includes an eye protection detection unit. After the controller sends a third control instruction to the projection display module, it further includes:

[0027] The controller receives a first detection distance sent by the projection display module, and the first detection distance is detected by the eye protection detection unit and sent to the projection display module;

[0028] When the first detection distance is less than a first distance threshold, the controller sends a seventh control instruction to the projection display module and continues to receive the first detection distance sent by the projection display module until the first distance is greater than or equal to the first distance threshold, and then the controller sends the third control instruction to the projection display module again;

[0029] Wherein, the seventh control instruction is used to instruct the projection display module to control the optical engine to emit light beams based on the startup screen and pre-stored second beam information.

[0030] Optionally, the projection device further includes a speaker. After the controller receives the first detection distance sent by the projection display module, it further includes:

[0031] When the first detection distance is less than a first distance threshold, the controller sends a voice prompt message to the speaker and continues to receive the first detection distance sent by the projection display module until the first distance is greater than or equal to the first distance threshold.

[0032] A shutdown control method for a projection device, the projection device includes a controller, a power module, a projection display module, a screen lifting module, an optical engine and a projection screen, the method is applied to the controller, and the method includes:

[0033] When the controller receives a shutdown instruction, output a shutdown screen to the projection display module according to a pre-stored descending curve segment, send an eighth control instruction to the projection display module, and send a ninth control instruction to the screen lifting module at the same time;

[0034] Wherein, the eighth control instruction is used to instruct the projection display module to control the optical engine to emit light beams based on the shutdown screen and pre-stored first beam information, and the ninth control instruction is used to instruct the screen lifting module to control the projection screen to descend to a first preset height according to the pre-stored descending curve segment;

[0035] When the controller determines that the projection screen has descended to the first preset height, send a tenth control instruction to the projection display module, and send an eleventh control instruction to the screen lifting module at the same time. The tenth control instruction is used to instruct the projection display module to control the optical engine to stop emitting light beams, and the eleventh control instruction is used to instruct the screen lifting module to control the projection screen to continue descending;

[0036] When the controller determines that the projection screen has descended to a third preset height, send a twelfth control instruction to the screen lifting module, and the twelfth control instruction is used to instruct the screen lifting module to control the projection screen to stop descending;

[0037] The controller controls the power module to disconnect from the projection display module and the screen lifting module respectively.

[0038] Optionally, the projection device further includes a first trigger switch. The controller determines that the projection screen has descended to the first preset height, including:

[0039] When the controller receives a first trigger signal sent by the screen lifting module, the controller determines that the projection screen has descended to the first preset height;

[0040] Wherein, the first trigger signal is triggered by the first trigger switch when the projection screen descends to the first preset height and sent to the screen lifting module.

[0041] Optionally, the projection screen includes a lifting motor, the projection device further includes an encoder. The controller determines that the projection screen has descended to the first preset height, including:

[0042] The controller receives the first descending height of the projection screen transmitted by the screen lifting module, and the first descending height is determined by the screen lifting module based on the third rotation angle of the lifting motor detected by the encoder;

[0043] When the difference between the second preset height and the first descending height is equal to the first preset height, the controller determines that the projection screen descends to the first preset height.

[0044] Optionally, after the controller sends the ninth control instruction to the screen lifting module, it further includes:

[0045] The controller receives the second descending height of the projection screen transmitted by the screen lifting module, and the second descending height is determined by the screen lifting module based on the fourth rotation angle of the lifting motor detected by the encoder;

[0046] The controller determines the third descending height of the shutdown screen according to the descending curve segment;

[0047] When the difference between the second descending height and the third descending height is greater than the difference threshold, the controller adjusts the descending speed of the shutdown screen, and outputs the shutdown screen to the projection display module at the adjusted descending speed, and then returns to the step where the controller receives the second descending height of the projection screen transmitted by the screen lifting module;

[0048] When the difference between the second descending height and the third descending height is less than or equal to the difference threshold, the controller continues to output the shutdown screen to the projection display module according to the descending curve segment.

[0049] Optionally, the projection device further includes a storage part, a flip drive mechanism, a sliding cover drive mechanism, a fourth trigger switch and a fifth trigger switch. After the controller sends the twelfth control instruction to the screen lifting module, it includes:

[0050] The controller sends a thirteenth control instruction to the screen lifting module so that the controller receives a fourth trigger signal sent by the screen lifting module;

[0051] The controller sends a fourteenth control instruction to the projection display module so that the controller receives a fifth trigger signal sent by the projection display module;

[0052] Among them, the thirteenth control instruction is used to instruct the screen lifting module to control the flip drive mechanism to flip. The fourth trigger signal is triggered by the fourth trigger switch when the flip drive mechanism blocks the lifting port of the storage part and is sent to the screen lifting module. The fourteenth control instruction is used to instruct the projection display module to control the sliding of the sliding cover drive mechanism. The fifth trigger signal is triggered by the fifth trigger switch when the sliding cover drive mechanism blocks the light-transmitting area of the storage part and is sent to the projection display module.

[0053] The beneficial effects of the technical solution provided by the embodiment of the present application at least include:

[0054] In the embodiment of the present application, when the controller receives the power-on instruction, it first powers on the projection display module and the screen lifting module. After the projection display module and the screen lifting module are ready, it first controls the projection screen to rise to the first preset height, and then controls the power-on screen and the projection screen to rise synchronously based on the rising curve segment until the projection screen rises to the second preset height, thereby ensuring the display effect of the picture on the projection screen and improving the reliability of the projection device during use. Description of the Drawings

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0056] Figure 1 It is a schematic diagram of the system structure of a projection device provided by the embodiment of the present application;

[0057] Figure 2 It is a schematic diagram of the system structure of another projection device provided by the embodiment of the present application;

[0058] Figure 3 It is a schematic diagram of the state of a storage part provided by the embodiment of the present application;

[0059] Figure 4 It is a schematic diagram of the state of another storage part provided by the embodiment of the present application;

[0060] Figure 5 It is a schematic diagram of the flowchart of the power-on control method of a projection device provided by the embodiment of the present application;

[0061] Figure 6 It is a schematic diagram of a rising curve segment provided by the embodiment of the present application;

[0062] Figure 7It is a schematic flow chart of a shutdown control method for a projection device provided by an embodiment of the present application;

[0063] Figure 8 It is a schematic diagram of a descending curve segment provided by an embodiment of the present application.

[0064] Reference numerals:

[0065] 01: Controller; 02: Power module; 03: Projection display module; 04: Screen lifting module; 05: Optical engine; 06: Projection screen; 07: First trigger switch; 08: Encoder; 09: Storage part; 10: Flap transmission mechanism; 11: Slide cover transmission mechanism; 12: Second trigger switch; 13: Third trigger switch; 14: Fourth trigger switch; 15: Fifth trigger switch;

[0066] 011: Audio-video processing and control module; 012: Storage module;

[0067] 031: Display control unit; 032: Display drive unit; 033: Storage unit; 034: Light source drive unit; 035: Slide cover drive unit;

[0068] 041: Screen control unit; 042: Lifting drive unit; 043: Flap drive unit. Detailed implementation manners

[0069] 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.

[0070] Before explaining in detail the power-on control method and the shutdown control method of the examples of the embodiments of the present application, the system structure diagram and the entity structure diagram of the projection device will be explained first.

[0071] Figure 1 Illustrates a system structure diagram of a projection device according to an embodiment of the present application. As Figure 1 shown, the projection device includes a controller 01, a power module 02, a projection display module 03, a screen lifting module 04, an optical engine 05 and a projection screen 06.

[0072] The controller 01 is electrically connected to the power supply module 02, the projection display module 03, and the screen lifting module 04 respectively. The power supply module 02 is also electrically connected to the projection display module 03 and the screen lifting module 04 respectively. The projection display module 03 is electrically connected to the optical engine 05, and the screen lifting module 04 is electrically connected to the projection screen 06. The controller 01 is used to control the power-on states of the power supply module 02 with the projection display module 03 and the screen lifting module 04 respectively. In addition, the controller 01 is also used to transmit video data to the projection display module 03, and to control the projection display module 03 to enable the optical engine 05 to emit light beams or turn off the light beams based on the video data, and to control the screen lifting module 04 to lift the projection screen 06. When the projection screen 06 is unfolded, it can receive the light beams to display the video data.

[0073] As Figure 2 shown, the controller 01 includes an audio-video processing and control module 011 and a storage module 012. The audio-video processing module is electrically connected to the storage module 012, and the audio-video processing and control module 011 is also electrically connected to the projection display module 03 and the screen lifting module 04 respectively.

[0074] The storage module 012 stores audio-video data. The audio-video processing and control module 011 can decode the audio-video data, and transmit the decoded video data to the projection display module 03, and transmit the decoded audio data to the speaker unit. In addition, the audio-video processing and control module 011 can send control instructions to the projection display module 03 and the screen lifting module 04, and receive the data information fed back by the projection display module 03 and the screen lifting module 04.

[0075] Among them, the speaker unit can be a structure included in the projection device itself, that is, the projection device also includes a speaker unit. Of course, it can also be a mechanism external to the projection device. Optionally, the speaker unit is a speaker.

[0076] As Figure 2 shown, the projection display module 03 includes a display control unit 031, a display driving unit 032, a storage unit 033, and a light source driving unit 034. The display control unit 031 is electrically connected to the controller 01, the display driving unit 032, and the light source driving unit 034 respectively. The display driving unit 032 is also electrically connected to the controller 01, the storage unit 033, and the light source driving power supply respectively. The light source driving unit 034 is electrically connected to the optical engine 05.

[0077] The display control unit 031 is configured to receive the control instructions sent by the controller 01 and control the display driving unit 032 and the light source driving unit 034 based on the control instructions. The display driving unit 032 is configured to receive the video data transmitted by the controller 01 and obtain the beam information from the storage unit 033, and then transmit the received video data and beam information to the light source driving unit 034. The light source driving unit 034 can drive the optical engine 05 to emit light beams based on the video data and beam information under the control of the display control unit 031. Among them, the beam information includes the brightness values and gray-scale values of the three primary color beams.

[0078] As Figure 2 shown, the screen lifting module 04 includes a screen control unit 041 and a lifting driving unit 042. The screen control unit 041 is electrically connected to the controller 01 and the lifting driving unit 042 respectively. The screen control unit 041 is configured to receive the control instructions sent by the controller 01 and control the lifting driving unit 042 based on the control instructions. The lifting driving unit 042 can control the projection screen 06 to lift under the control of the screen control unit 041.

[0079] During the lifting process of the projection screen 06, when the projection screen 06 rises or falls to the first preset height, it is at the critical height between being able to receive the light beams emitted by the optical engine 05 and not being able to receive the light beams emitted by the optical engine 05. That is, if the projection screen 06 continues to rise based on the first preset height, it can receive the light beams emitted by the optical engine 05. If the projection screen 06 continues to fall based on the first preset height, it cannot receive the light beams emitted by the optical engine 05. When the projection screen 06 rises to the second preset height, it can receive the light beams emitted by the optical engine 05 and display a complete display picture. At this time, the projection screen 06 is in the unfolded state; when the projection screen 06 falls to the third preset height, it can no longer receive the light beams emitted by the optical engine 05. At this time, the projection screen 06 is in the retracted state.

[0080] In the embodiment of the present application, the projection screen 06 includes a base, a curling transmission mechanism, a lifting transmission mechanism, and a screen sheet. The curling transmission mechanism is limited on the base, the lifting transmission mechanism is fixed on the base, and the two opposite sides of the screen sheet are respectively fixed to the curling transmission mechanism and the lifting transmission mechanism. The curling transmission mechanism and the lifting transmission mechanism can cooperate to realize the retraction or unfolding of the screen sheet.

[0081] Combined with the above description, when the projection screen 06 rises or falls to the first preset height, the screen sheet is at the critical height between being able to receive the light beams emitted by the optical engine 05 and not being able to receive the light beams emitted by the optical engine 05. When the projection screen 06 continues to rise to the second preset height, the screen sheet is in the unfolded state; when the projection screen 06 falls to the third preset height, the screen sheet is in the retracted state.

[0082] Among them, the lifting drive mechanism is an electric lifting mechanism, that is, the lifting drive mechanism includes a lifting motor and a lifting frame. The lifting motor is electrically connected to the screen lifting module 04, and the lifting motor is also drivingly connected to the lifting frame. The curling drive mechanism is a energy storage type curling mechanism or an electric curling mechanism. When the curling drive mechanism is an electric curling mechanism, the curling drive mechanism includes a curling motor and a reel. The curling motor is electrically connected to the screen lifting module 04, and the curling motor is drivingly connected to the reel. At this time, the controller 01 is used to control the start and stop of the lifting motor and the curling motor through the screen lifting module 04 to realize the unfolding or retraction of the screen.

[0083] Among them, both the lifting motor and the curling motor have the function of power-off braking, that is, the lifting motor and the winding motor will stop after power-off, so as to ensure that the screen will not fall naturally and improve the reliability of the projection device.

[0084] Optionally, as Figure 1 shown, the projection device further includes a first trigger switch 07. The first trigger switch 07 is electrically connected to the screen lifting module 04. The first trigger switch 07 can generate a first trigger signal when the projection screen 06 rises to a first preset height or descends to a first preset height, and transmit it to the screen lifting module 04.

[0085] Optionally, as Figure 1 shown, the projection device further includes an encoder 08. The encoder 08 is electrically connected to the screen lifting module 04. The encoder 08 is installed on the lifting motor. The encoder 08 is used to detect the rotation angle and angular velocity of the lifting motor, and transmit the detected rotation angle and angular velocity to the screen lifting module 04.

[0086] At this time, the screen lifting module 04 can determine the rising height or descending height of the projection screen 06 according to the detected rotation angle, and can determine the rising speed or descending speed of the projection screen 06 according to the detected angular velocity.

[0087] Among them, the screen lifting module 04 can determine the rising speed or descending speed of the projection screen 06 according to the detected angular velocity and the transmission ratio between the lifting motor and the lifting frame. Similarly, it can determine the rising height or descending height according to the detected rotation angle and the transmission ratio between the lifting motor and the lifting frame. Of course, it can also determine the rising speed or descending speed of the projection screen 06, as well as the rising height or descending height according to other methods based on the detected angular velocity or rotation angle. For details, reference can be made to related technologies, and the embodiments of the present application do not limit this.

[0088] Exemplarily, in the embodiments of the present application, the rising height or descending height of the projection screen can be determined according to the following formula.

[0089] H = 16.6×θ + 481

[0090] Wherein, H refers to the rising height or falling height of the projection screen, and θ refers to the rotation angle of the lifting motor.

[0091] In the embodiment of the present application, the projection device includes a storage part 09, the storage part 09 has a first accommodation part and a second accommodation part, a light-transmitting area communicated with the first accommodation part, and a lifting opening communicated with the second accommodation part. Figure 3 and Figure 4 Schematic diagrams of different states of a storage part 09 in the embodiment of the present application are exemplified.

[0092] Wherein, the controller 01, the power supply module 02, the projection display module 03, the screen lifting module 04, and the optical engine 05 are all located in the first accommodation part, the projection screen 06 is fixed in the second accommodation part, the light beam emitted by the optical engine 05 can pass through the light-transmitting area, and the projection screen 06 can be lifted through the lifting opening. In addition, the first trigger switch 07 is installed above the lifting opening of the storage part 09, and the height where the first trigger switch 07 is located is equal to the first preset height.

[0093] Optionally, as Figure 1 shown, the projection device further includes a flip drive mechanism 10, a sliding cover drive mechanism 11, a second trigger switch 12, a third trigger switch 13, a fourth trigger switch 14, and a fifth trigger switch 15.

[0094] Correspondingly, as Figure 2 shown, the screen lifting module 04 further includes a flip drive unit 043, the projection display module 03 further includes a sliding cover drive unit 035, the flip drive unit 043 is electrically connected to the screen control unit 041, and the sliding cover drive unit 035 is electrically connected to the display control unit 031. As Figure 3 or Figure 4 shown, the flip drive mechanism 10 is installed in the second accommodation part and is located at the lifting opening, and the sliding cover drive mechanism 11 is installed in the first accommodation part and is located at the light-transmitting area.

[0095] The flip drive unit 043 can control the flip of the flip drive mechanism 10 under the control of the screen control unit 041 to switch between blocking the lifting opening and avoiding the lifting opening; the sliding cover drive unit 035 can control the sliding of the sliding cover drive mechanism 11 under the control of the display control unit 031 to switch between blocking the light-transmitting area and avoiding the light-transmitting area.

[0096] Among them, the second trigger switch 12 and the fourth trigger switch 14 are both electrically connected to the screen lifting module 04. The second trigger switch 12 can generate a second trigger signal when the flip drive mechanism 10 flips to avoid the lifting port and transmit it to the screen lifting module 04. The fourth trigger switch 14 can generate a fourth trigger signal when the flip drive mechanism 10 flips to block the lifting port and transmit it to the screen lifting module 04. The third trigger switch 13 and the fifth trigger switch 15 are both electrically connected to the projection display module 03. The third trigger switch 13 can generate a third trigger signal when the sliding cover drive mechanism 11 flips to avoid the light transmission area and transmit it to the projection display module 03. The fifth trigger switch 15 can generate a fifth trigger signal when the sliding cover drive mechanism 11 flips to block the light transmission area and transmit it to the projection display module 03.

[0097] Optionally, the projection device further includes an eye protection detection unit, which is electrically connected to the projection display module 03. The eye protection detection unit is used to detect whether a user approaches and transmit the detected detection distance from the user to the projection display module 03.

[0098] Among them, in combination with the above introduction of the projection display module 03, the eye protection detection unit is electrically connected to the display control unit 031. The eye protection detection unit includes a pyroelectric sensor or a millimeter wave radar sensor, etc.

[0099] Optionally, the projection device further includes an obstacle detection unit, which is electrically connected to the screen lifting module 04. The obstacle detection unit is used to detect whether there is an obstacle above the projection screen 06 and whether there is an obstacle approaching the projection screen 06, and transmit the detected obstacle signal or detection distance to the screen lifting module 04.

[0100] Among them, in combination with the above introduction of the screen lifting module 04, the obstacle detection unit is electrically connected to the screen control unit 041. The obstacle detection unit includes an infrared sensor, a radar sensor, etc.

[0101] Next, the power-on control method of the projection device according to the embodiment of the present application will be explained.

[0102] Figure 5 The flow chart of a power-on control method of a projection device according to an embodiment of the present application is illustrated. This method is applied to the controller included in the projection device described in the above embodiment. As Figure 5 shown, this method includes the following steps.

[0103] Step 501: When the controller receives a power-on instruction, control the power module to conduct with the projection display module and the screen lifting module respectively.

[0104] Among them, the projection device has a power-on button, which is electrically connected to the controller. At this time, the user can press the power-on button to trigger a power-on instruction and transmit it to the controller; or the projection device includes a remote controller, which is electrically connected to the controller. At this time, the user can press the power-on button on the remote controller to trigger a power-on instruction and transmit it to the controller.

[0105] When the controller receives the power-on instruction, it indicates that the user wants to view the projection device. At this time, the controller controls the power module to supply power to the projection display module and the screen lifting module respectively, so as to realize the startup of the optical engine and the projection screen through the following steps 502 - 507.

[0106] In the embodiment of the present application, before the startup of the optical engine and the projection screen is realized, the projection display module and the screen lifting module can also perform self-checks and feedback the self-check signals to the controller. At this time, the controller can determine the current states of the projection display module and the screen lifting module according to the self-check signals of the projection display module and the screen lifting module respectively, so as to ensure that both the projection display module and the screen lifting module are in a ready state.

[0107] In the embodiment of the present application, in the case where the projection device includes a flip drive mechanism, the flip drive mechanism may be in a state of blocking the lifting port of the storage part. Therefore, in order to ensure the normal rising of the projection screen, the flip drive mechanism can be controlled to flip to a state of avoiding the lifting port of the storage part through the following step 502 first.

[0108] Step 502: The controller sends a fifth control instruction to the screen lifting module so that the controller receives a second trigger signal sent by the screen lifting module.

[0109] Among them, the fifth control instruction is used to instruct the screen lifting module to control the flip drive mechanism to flip, and the second trigger signal is triggered by the second trigger switch when the flip drive mechanism avoids the lifting port of the storage part and sent to the screen lifting module. That is, the second trigger signal can indicate that the flip drive mechanism is in a state of avoiding the lifting port of the storage part.

[0110] Combined with the introduction of the above screen lifting module, at this time, the controller sends a fifth control instruction to the screen control unit, and then the screen control unit sends a drive signal to the flip drive unit based on the fifth control instruction to drive the flip drive mechanism to flip until the flip drive mechanism avoids the lifting port of the storage part.

[0111] Step 503: The controller sends a first control instruction to the screen lifting module, and the first control instruction is used to instruct the screen lifting module to control the projection screen to rise.

[0112] Combined with the above introduction of the screen lifting module and the projection screen, at this time, a first control instruction is sent to the screen control unit, and then the screen control unit sends a drive signal to the projection screen based on the first control instruction to drive the lifting motor and the curling motor to start, so as to realize the lifting of the projection screen.

[0113] Among them, when the screen lifting module controls the projection screen to rise based on the first control instruction, before the projection screen rises to the first preset height, the optical engine does not emit light beams, so that there will be no display image on the projection screen during this process, and the display effect will not be affected. Therefore, the speed of controlling the projection screen to rise based on the first control instruction can be any speed, and the embodiments of the present application do not limit this.

[0114] Furthermore, in the case where the projection device includes an obstacle detection unit, in order to avoid obstacles when the projection screen rises, before controlling the projection screen to rise, that is, before the controller sends the first control instruction to the screen lifting module, the following method can be used to detect whether there are obstacles above the projection screen.

[0115] The controller receives the obstacle detection signal sent by the screen lifting module. The obstacle detection signal is detected by the obstacle detection unit and sent to the screen lifting module; if the controller determines that there is an obstacle at the lifting port of the storage part based on the obstacle signal, the controller continues to receive the obstacle detection signal sent by the screen lifting module until the controller determines that there is no obstacle at the lifting port of the storage part based on the obstacle signal.

[0116] Step 504: When the controller determines that the projection screen has risen to the first preset height, send a second control instruction to the screen lifting module. The second control instruction is used to instruct the screen lifting module to control the projection screen to stop rising.

[0117] Among them, the controller can determine that the projection screen has risen to the first preset height in the following way.

[0118] In some embodiments, in the case where the projection device includes a first trigger switch, when the controller receives the first trigger signal sent by the screen lifting module, the controller determines that the projection screen has risen to the first preset height;

[0119] Among them, the first trigger signal is triggered by the first trigger switch when the projection screen rises to the first preset height and sent to the screen lifting module.

[0120] In other embodiments, in the case where the projection screen includes a lifting motor and the projection device includes an encoder, the controller receives the first rising height of the projection screen transmitted by the screen lifting module. When the first rising height is equal to the first preset height, the controller determines that the projection screen has risen to the first preset height.

[0121] Wherein, the first rising height is determined by the screen lifting module based on the first rotation angle of the lifting motor detected by the encoder.

[0122] Of course, in the embodiments of the present application, in addition to determining that the projection screen rises to the first preset height through the above two methods, it is also possible to determine that the projection screen rises to the first preset height through other methods. For example, when the controller receives a confirmation instruction, it determines that the projection screen rises to the first preset height. The confirmation instruction is triggered by the user when the projection screen rises to the first preset height.

[0123] After determining that the projection screen rises to the first preset height, the projection display module may not be ready. At this time, in order to ensure that the projection screen rises synchronously with the startup screen, the projection screen can be first controlled to stop rising through a second control instruction.

[0124] It should be noted that if the controller determines that the screen lifting module is in a ready state, the above steps 502 - 504 can be directly executed without waiting for the controller to determine that the projection display module is in a ready state.

[0125] In the embodiments of the present application, when the projection device includes a sliding cover transmission mechanism, the sliding cover transmission mechanism may be in a state of blocking the light-transmitting area of the storage part. Therefore, in order to ensure the normal light output of the optical engine, the sliding cover transmission mechanism can be first controlled to slide to a state of avoiding the light-transmitting area of the storage part through the following step 505.

[0126] Step 505: The controller sends a sixth control instruction to the projection display module so that the controller receives a third trigger signal sent by the projection display module.

[0127] Wherein, the sixth control instruction is used to instruct the projection display module to control the sliding of the sliding cover transmission mechanism, and the third trigger signal is triggered by the third trigger switch when the sliding cover transmission mechanism avoids the light-transmitting area of the storage part and sent to the projection display module. That is, the third trigger signal can indicate that the sliding cover transmission mechanism is in a state of avoiding the light-transmitting area of the storage part.

[0128] Combined with the above introduction of the projection display module, at this time, the controller sends a sixth control instruction to the display control unit, and then the display control unit sends a driving signal to the sliding cover driving unit based on the sixth control instruction to drive the sliding cover transmission mechanism to slide until the sliding cover transmission mechanism avoids the light-transmitting area of the storage part.

[0129] It should be noted that if the controller determines that the projection display module is in a ready state, the above step 505 can be directly executed without waiting for the controller to determine that the screen lifting module is in a ready state.

[0130] It can be seen from this that there is no sequential relationship between the above step 505 and the above steps 502 - 504. That is, the above step 505 can be executed before the above step 502, or after the above step 504. Of course, it can also be executed during the execution of the above steps 502 - 504. The embodiments of the present application do not limit this.

[0131] It should be noted that in order to avoid a long stop time of the projection screen after the above step 504 is executed, so as to avoid the user thinking that the projection device has a fault, at this time, the rising speed of the projection screen controlled based on the first control instruction can be determined according to the first preset height, the self - inspection time of the projection display module, and the time for the control slide - cover transmission mechanism to be in the light - transmitting area avoidance state.

[0132] In the embodiments of the present application, after ensuring that the projection screen rises to the first preset height through the above steps 502 - 505, and the slide - cover transmission mechanism is in the state of avoiding the light - transmitting area, the following step 506 can be used to ensure that the projection screen rises synchronously with the startup screen, so as to ensure a better display effect.

[0133] Step 506: The controller outputs the startup screen to the projection display module according to the pre - stored rising curve segment, sends a third control instruction to the projection display module, and simultaneously sends a fourth control instruction to the screen lifting module.

[0134] Among them, the third control instruction is used to instruct the projection display module to control the optical engine to emit light beams based on the startup screen and the pre - stored first beam information, and the fourth control instruction is used to instruct the screen lifting module to control the projection screen to continue rising according to the pre - stored rising curve segment. In this way, since both the startup screen and the projection screen rise according to the rising curve segment, the synchronization of the rising of the startup screen and the projection screen is ensured.

[0135] Among them, as Figure 6 shown, the rising curve segment is composed of multiple rising times and multiple rising heights corresponding one - to - one with the multiple rising times. The multiple rising heights refer to the height values between the first preset height and the second preset height.

[0136] It should be noted that when both the startup screen and the projection screen rise according to the rising curve segment, there may be situations such as the lifting motor of the projection screen slipping and the lifting frame wearing, resulting in the actual rising height of the projection screen being different from the rising height according to the rising curve segment. At this time, it is necessary to adjust the rising height of the projection screen or the rising height of the startup screen to further ensure the synchronization of the rising of the startup screen and the projection screen.

[0137] Exemplarily, the synchronization between the startup screen and the rising of the projection screen can be further ensured in the following steps. The controller receives the second rising height of the projection screen transmitted by the screen lifting module; the controller determines the third rising height of the startup screen according to the rising curve segment; when the difference between the second rising height and the third rising height is greater than the difference threshold, the controller adjusts the rising speed of the startup screen and outputs the startup screen to the projection display module at the adjusted rising speed, and then returns to the step where the controller receives the second rising height of the projection screen transmitted by the screen lifting module; when the difference between the second rising height and the third rising height is less than or equal to the difference threshold, the controller continues to output the startup screen to the projection display module according to the rising curve segment.

[0138] Among them, the second rising height is determined by the screen lifting module based on the second rotation angle of the lifting motor detected by the encoder. The controller can determine the rising duration of the startup screen, and then determine the third rising height of the startup screen on the rising curve segment according to the rising duration. The adjustment of the rising speed of the startup screen by the controller includes increasing the rising speed of the startup screen or decreasing the rising speed of the startup screen. If, after one adjustment, the difference between the newly determined second rising height and the third rising height is greater than the difference threshold, the rising speed of the startup screen is continuously adjusted until the difference between the newly determined second rising height and the third rising height after adjustment is less than or equal to the difference threshold.

[0139] In the embodiment of the present application, during the execution of the above step 506, the user may approach the projection device, and at this time, the light beam emitted by the optical engine may stimulate the user's eyes. Therefore, the projection device further includes an eye protection detection unit, and the stimulation of the user's eyes when approaching can be avoided in the following manner.

[0140] The controller receives the first detection distance sent by the projection display module; when the first detection distance is less than the first distance threshold, the controller sends a seventh control instruction to the projection display module and continues to receive the first detection distance sent by the projection display module until the first distance is greater than or equal to the first distance threshold, and the controller sends a third control instruction to the projection display module again;

[0141] Among them, the first detection distance is detected by the eye protection detection unit and sent to the projection display module; the seventh control instruction is used to instruct the projection display module to control the optical engine to emit a light beam based on the startup screen and the pre-stored second light beam information. The brightness value of the light beam emitted based on the second light beam information is less than the brightness value of the light beam emitted based on the first light beam information. Therefore, through the seventh control instruction, the brightness value of the light beam emitted by the optical engine can be reduced, thereby avoiding the stimulation of the user's eyes.

[0142] Further, the projection device further includes a speaker. At this time, after the controller receives the first detected distance sent by the projection display module, when it determines that the first detected distance is less than the first distance threshold, it indicates that the user is approaching the projection device. At this time, in order to facilitate reminding the user, the controller sends a voice prompt message to the speaker and continues to receive the first detected distance sent by the projection display module until the first distance is greater than or equal to the first distance threshold.

[0143] Wherein, the speaker can receive the voice prompt message sent by the controller and then play the voice prompt message to prompt the user.

[0144] Step 507: When the controller determines that the projection screen has risen to the second preset height, it sends a second control instruction to the screen lifting module.

[0145] Combined with the above description, the second preset height refers to the height when the projection screen is unfolded. In this way, if the projection screen rises to the second preset height, it indicates that the projection screen is in the unfolded state. At this time, the controller can send a second control instruction to control the projection screen to stop rising through the second control instruction.

[0146] Wherein, in the case where the projection device includes an encoder, the controller can receive the fourth rising height sent by the screen lifting module and compare the fourth rising height with the second preset height to determine whether the projection screen has risen to the second preset height. The fourth rising height is determined by the screen lifting module based on the fifth rotation angle of the lifting motor detected by the encoder.

[0147] Combined with the above introduction of the projection screen, at this time, both the lifting motor and the curling motor are in the power-off brake state, ensuring that the screen is in the unfolded state. That is, at this time, the projection device is in the normal power-on state.

[0148] In the embodiment of the present application, when the controller receives the power-on instruction, it first powers on the projection display module and the screen lifting module. After the projection display module and the screen lifting module are ready, it first controls the projection screen to rise to the first preset height, and then controls the startup screen and the projection screen to rise synchronously based on the rising curve segment until the projection screen rises to the second preset height, thus ensuring the synchronization of the startup screen and the rising of the projection screen, and further ensuring the display effect of the picture on the projection screen. In addition, during the rising process of the startup screen and the projection screen, it is also possible to adjust based on the rising height of the startup screen and the rising height of the projection screen to further ensure the synchronization of the startup screen and the rising of the projection screen, and further improve the reliability of the projection device.

[0149] Next, a shutdown control method of a projection device according to an embodiment of the present application will be explained.

[0150] Figure 7The flowchart of a shutdown control method for a projection device according to an embodiment of the present application is illustrated. This method is used for the controller included in the projection device described in the above embodiment, such as Figure 7 As shown, the method includes the following steps.

[0151] Step 701: When the controller receives a shutdown instruction, output a shutdown screen to the projection display module according to a pre-stored descending curve segment, send an eighth control instruction to the projection display module, and send a ninth control instruction to the screen lifting module at the same time.

[0152] Among them, the eighth control instruction is used to instruct the projection display module to control the optical engine to emit light beams based on the shutdown screen and the pre-stored first beam information, and the ninth control instruction is used to instruct the screen lifting module to control the projection screen to descend to a first preset height according to the pre-stored descending curve segment. In this way, since both the shutdown screen and the projection screen descend according to the descending curve segment, the synchronization of the descent of the shutdown screen and the projection screen is ensured.

[0153] Among them, as Figure 8 shown, the descending curve segment is composed of multiple descending times and multiple descending heights corresponding one by one to the multiple descending times. The multiple descending heights refer to the height values between the first preset height and the second preset height.

[0154] In the embodiment of the present application, when both the shutdown screen and the projection screen descend according to the descending curve segment, there may be situations such as slipping of the lifting motor included in the projection screen and wear of the lifting frame, resulting in the actual descending height of the projection screen being unequal to the descending height according to the descending curve segment. At this time, it is necessary to adjust the descending height of the projection screen or the descending height of the shutdown screen to further ensure the synchronization of the descent of the shutdown screen and the projection screen.

[0155] Exemplarily, the synchronization of the descent of the shutdown screen and the projection screen can be further ensured through the following steps (1)-(4).

[0156] (1), The controller receives the second descending height of the projection screen transmitted by the screen lifting module.

[0157] Among them, the second descending height is determined by the screen lifting module based on the fourth rotation angle of the lifting motor detected by the encoder.

[0158] Among them, the second ascending height is determined by the screen lifting module based on the second rotation angle of the lifting motor detected by the encoder.

[0159] (2), The controller determines the third descending height of the shutdown screen according to the descending curve segment.

[0160] Among them, the controller can determine the descent duration of the shutdown screen, and then determine the third descent height of the shutdown screen on the descent curve segment according to the descent duration.

[0161] (3) When the difference between the second descent height and the third descent height is greater than the difference threshold, the controller adjusts the descent speed of the shutdown screen, and outputs the shutdown screen to the projection display module at the adjusted descent speed, and then returns to the above step (1).

[0162] Among them, the adjustment of the descent speed of the shutdown screen by the controller includes increasing the descent speed of the shutdown screen or decreasing the descent speed of the shutdown screen. If, after one adjustment, the difference between the newly determined second descent height and the third descent height is greater than the difference threshold, continue to adjust the descent speed of the shutdown screen until the difference between the newly determined second descent height and the third descent height after adjustment is less than or equal to the difference threshold.

[0163] (4) When the difference between the second descent height and the third descent height is less than or equal to the difference threshold, the controller continues to output the shutdown screen to the projection display module according to the descent curve segment.

[0164] In the embodiment of the present application, when the projection screen descends, the user may approach the projection device, and in this case, there may be a situation where the user obstructs the descent of the projection screen. Therefore, the projection device further includes an obstacle detection unit, and the situation where the user obstructs the descent of the projection screen can be avoided in the following manner.

[0165] The controller receives the second detection distance sent by the screen lifting module; when the second detection distance is less than the second distance threshold, the controller pauses outputting the shutdown screen to the projection display module, sends the tenth control instruction to the projection display module, and sends the twelfth control instruction to the screen lifting module, and then returns to the step where the controller receives the second detection distance sent by the screen lifting module; when the second detection distance is greater than or equal to the second distance threshold, the controller continues to output the shutdown screen to the projection display module, and sends the eighth control instruction to the projection display module and the ninth control instruction to the screen lifting module.

[0166] Among them, the second detection distance is detected by the obstacle detection unit and sent to the screen lifting module.

[0167] In this way, when there is a situation where the user obstructs the descent of the projection screen, the controller can control the stopping of the light beam emission through the tenth control instruction, that is, turn off the backlight, and control the projection screen to stop descending through the twelfth control instruction, thereby avoiding the situation of user influence, and at the same time ensuring that when the projection screen continues to descend subsequently, there will be no situation where the shutdown screen is out of sync with the projection screen.

[0168] Step 702: When the controller determines that the projection screen has descended to the first preset height, it sends the tenth control instruction to the projection display module and simultaneously sends the eleventh control instruction to the screen lifting module.

[0169] Among them, the tenth control instruction is used to instruct the projection display module to control the optical engine to stop emitting light beams, and the eleventh control instruction is used to instruct the screen lifting module to control the projection screen to continue descending.

[0170] When the projection screen descends to the first preset height, at this time the projection screen is at the critical height. In this way, during the subsequent descent process of the projection screen, it is no longer necessary for the optical engine to emit light beams. Therefore, at this time, the controller can make the optical engine stop emitting light beams through the tenth control instruction, that is, make the optical engine turn off the backlight.

[0171] In addition, when the projection screen descends to the first preset height, then during the subsequent descent process of the projection screen, there is no need to consider the synchronization problem between the shutdown screen and the projection screen. Therefore, the subsequent descent speed of the projection screen can be any value. Therefore, at this time, the projection screen can be made to continue descending through the eleventh control instruction.

[0172] Among them, the controller can determine that the projection screen has descended to the first preset height in the following manner.

[0173] In some embodiments, when the projection device includes a first trigger switch, when the controller receives the first trigger signal sent by the screen lifting module, the controller determines that the projection screen has descended to the first preset height.

[0174] Among them, the first trigger signal is triggered by the first trigger switch when the projection screen descends to the first preset height and is sent to the screen lifting module.

[0175] In other embodiments, when the projection screen includes a lifting motor and the projection device further includes an encoder, the controller receives the first descent height of the projection screen transmitted by the screen lifting module. When the difference between the second preset height and the first descent height is equal to the first preset height, the controller determines that the projection screen has descended to the first preset height.

[0176] Among them, the first descent height is determined by the screen lifting module based on the third rotation angle of the lifting motor detected by the encoder.

[0177] Of course, in the embodiments of the present application, in addition to determining that the projection screen has descended to the first preset height through the above two methods, it is also possible to determine that the projection screen has descended to the first preset height through other methods. For example, when the controller receives a confirmation instruction, it determines that the projection screen has descended to the first preset height. The confirmation instruction is triggered by the user when the projection screen descends to the first preset height.

[0178] In an embodiment of the present application, when the projection device includes a sliding cover drive mechanism, the sliding cover drive mechanism may be in a state of avoiding the light-transmitting area of the storage part. Therefore, in order to effectively protect the optical engine, the sliding cover drive mechanism can be controlled to slide to a state of blocking the light-transmitting area of the storage part through the following step 703.

[0179] Step 703: The controller sends a fourteenth control instruction to the projection display module so that the controller receives a fifth trigger signal sent by the projection display module.

[0180] Among them, the fourteenth control instruction is used to instruct the projection display module to control the sliding of the sliding cover drive mechanism, and the fifth trigger signal is triggered by the fifth trigger switch when the sliding cover drive mechanism blocks the light-transmitting area of the storage part and sent to the projection display module.

[0181] Combined with the above introduction of the projection display module, at this time, the controller sends a fourteenth control instruction to the display control unit, and then the display control unit sends a drive signal to the sliding cover drive unit based on the fourteenth control instruction to drive the sliding cover drive mechanism to slide until the sliding cover drive mechanism blocks the light-transmitting area of the storage part.

[0182] Step 704: When the controller determines that the projection screen has descended to the third preset height, it sends a twelfth control instruction to the screen lifting module.

[0183] Among them, the twelfth control instruction is used to instruct the screen lifting module to control the projection screen to stop descending.

[0184] Combined with the above description, the third preset height refers to the height corresponding to when the projection screen is retracted. It can be seen that in this case, it means that the projection screen is already in the retracted state, and at this time, the projection screen can be stopped from descending through the twelfth control instruction sent by the controller.

[0185] Among them, when determining the height of the projection screen's descent, the controller can receive the fourth descent height sent by the screen lifting module. If the fourth descent height is equal to the second preset height, it indicates that the current height of the projection screen is the third preset height. The fourth descent height is determined by the screen lifting module according to the fifth rotation angle of the lifting motor detected by the encoder.

[0186] In an embodiment of the present application, when the projection device includes a flip cover drive mechanism, the flip cover drive mechanism may be in a state of avoiding the lifting opening of the storage part. Therefore, in order to effectively protect the projection device, the flip cover drive mechanism can be controlled to flip to a state of blocking the lifting opening of the storage part through the following step 705.

[0187] Step 705: The controller sends a thirteenth control instruction to the screen lifting module so that the controller receives a fourth trigger signal sent by the screen lifting module.

[0188] Among them, the thirteenth control instruction is used to instruct the screen lifting module to control the flip drive mechanism to flip, and the fourth trigger signal is triggered by the fourth trigger switch when the flip drive mechanism blocks the lifting port of the storage part and sent to the screen lifting module.

[0189] Combined with the above introduction of the screen lifting module, at this time, the controller sends the thirteenth control instruction to the screen control unit, and then the screen control unit sends a drive signal to the flip drive unit based on the thirteenth control instruction to drive the flip drive mechanism to flip until the flip drive mechanism blocks the lifting port of the storage part.

[0190] It should be noted that the above step 703 can be executed before step 704, or after step 705. Of course, it can also be executed after step 704 and before step 705. The embodiments of the present application do not make any limitations in this regard.

[0191] Step 706: The controller controls the power module to be disconnected from the projection display module and the screen lifting module respectively.

[0192] After performing the above steps 703 and 705, it indicates that the projection display module and the screen lifting module have completed all the actions that need to be performed and are in the standby state. At this time, the controller can control the power module to be disconnected from the projection display module and the screen lifting module respectively, that is, control the projection display module and the screen lifting module to be in the power-off state to complete the shutdown of the projection device.

[0193] In the embodiments of the present application, when the controller receives the shutdown instruction, it controls the shutdown screen and the projection screen to descend synchronously based on the descending curve segment until the projection screen descends to the first preset height, thereby ensuring the synchronism of the descent of the shutdown screen and the projection screen, and further ensuring the display effect of the picture on the projection screen. In addition, during the descent of the shutdown screen and the projection screen, it is also possible to adjust based on the descent height of the shutdown screen and the descent height of the projection screen to further ensure the synchronism of the descent of the shutdown screen and the projection screen, and further improve the reliability of the projection device.

[0194] The above are only 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 protection scope of the embodiments of the present application.

Claims

1. A method for controlling the startup of a projection device, characterized in that, The projection device includes a controller, a power module, a projection display module, a screen lifting module, an optical engine, and a projection screen. The method is applied to the controller, and the method includes: When the controller receives a power-on instruction, it controls the power module to be electrically connected to the projection display module and the screen lifting module respectively; The controller sends a first control instruction to the screen lifting module, and the first control instruction is used to instruct the screen lifting module to control the projection screen to rise; When the controller determines that the projection screen has risen to a first preset height, it sends a second control instruction to the screen lifting module, and the second control instruction is used to instruct the screen lifting module to control the projection screen to stop rising; The controller outputs a power-on screen to the projection display module according to a pre-stored rising curve segment, sends a third control instruction to the projection display module, and simultaneously sends a fourth control instruction to the screen lifting module; Among them, the third control instruction is used to instruct the projection display module to control the optical engine to emit light beams based on the power-on screen and pre-stored first beam information, and the fourth control instruction is used to instruct the screen lifting module to control the projection screen to continue rising according to the pre-stored rising curve segment; When the controller determines that the projection screen has risen to a second preset height, it sends the second control instruction to the screen lifting module.

2. The method according to claim 1, characterized in that, The projection device further includes a first trigger switch. The controller determines that the projection screen has risen to the first preset height, including: When the controller receives a first trigger signal sent by the screen lifting module, the controller determines that the projection screen has risen to the first preset height; Among them, the first trigger signal is triggered by the first trigger switch when the projection screen rises to the first preset height and sent to the screen lifting module.

3. The method according to claim 1, characterized in that, The projection screen includes a lifting motor, and the projection device further includes an encoder. The controller determines that the projection screen has risen to the first preset height, including: The controller receives a first rising height of the projection screen transmitted by the screen lifting module, and the first rising height is determined by the screen lifting module based on a first rotation angle of the lifting motor detected by the encoder; When the first rising height is equal to the first preset height, the controller determines that the projection screen has risen to the first preset height.

4. The method according to claim 3, characterized in that, After the controller sends the fourth control instruction to the screen lifting module, it further includes: The controller receives a second rising height of the projection screen transmitted by the screen lifting module, and the second rising height is determined by the screen lifting module based on a second rotation angle of the lifting motor detected by the encoder; The controller determines a third rising height of the power-on screen according to the rising curve segment; When the difference between the second rising height and the third rising height is greater than the difference threshold, the controller adjusts the rising speed of the startup screen, outputs the startup screen to the projection display module at the adjusted rising speed, and then returns to the step where the controller receives the second rising height of the projection screen transmitted by the screen lifting module; When the difference between the second rising height and the third rising height is less than or equal to the difference threshold, the controller continues to output the startup screen to the projection display module according to the rising curve segment.

5. The method according to any one of claims 1-4, characterized in that, The projection device further includes a storage part, a flip drive mechanism, a slide drive mechanism, a second trigger switch, and a third trigger switch. Before the controller sends a first control instruction to the screen lifting module, it further includes: The controller sends a fifth control instruction to the screen lifting module so that the controller receives a second trigger signal sent by the screen lifting module; The controller sends a sixth control instruction to the projection display module so that the controller receives a third trigger signal sent by the projection display module; Wherein, the fifth control instruction is used to instruct the screen lifting module to control the flip drive mechanism to flip, the second trigger signal is triggered by the second trigger switch when the flip drive mechanism avoids the lifting opening of the storage part and sent to the screen lifting module, the sixth control instruction is used to instruct the projection display module to control the slide drive mechanism to slide, and the third trigger signal is triggered by the third trigger switch when the slide drive mechanism avoids the light-transmitting area of the storage part and sent to the projection display module.

6. The method according to claim 5, characterized in that, The projection device further includes an eye protection detection unit. After the controller sends a third control instruction to the projection display module, it further includes: The controller receives a first detection distance sent by the projection display module, and the first detection distance is detected by the eye protection detection unit and sent to the projection display module; When the first detection distance is less than the first distance threshold, the controller sends a seventh control instruction to the projection display module and continues to receive the first detection distance sent by the projection display module until the first distance is greater than or equal to the first distance threshold, and then the controller sends the third control instruction to the projection display module again; Wherein, the seventh control instruction is used to instruct the projection display module to control the optical engine to emit light beams based on the startup screen and pre-stored second beam information.

7. The method according to claim 6, characterized in that, The projection device further includes a speaker. After the controller receives the first detection distance sent by the projection display module, it further includes: When the first detection distance is less than the first distance threshold, the controller sends a voice prompt message to the speaker and continues to receive the first detection distance sent by the projection display module until the first distance is greater than or equal to the first distance threshold.

8. A method for controlling the shutdown of a projection device, characterized in that, The projection device includes a controller, a power module, a projection display module, a screen lifting module, an optical engine, and a projection screen. The method is applied to the controller, and the method includes: When the controller receives a shutdown instruction, it outputs a shutdown screen to the projection display module according to a pre-stored descending curve segment, sends an eighth control instruction to the projection display module, and simultaneously sends a ninth control instruction to the screen lifting module; Among them, the eighth control instruction is used to instruct the projection display module to control the optical engine to emit light beams based on the shutdown screen and pre-stored first beam information, and the ninth control instruction is used to instruct the screen lifting module to control the projection screen to descend to a first preset height according to the pre-stored descending curve segment; When the controller determines that the projection screen has descended to the first preset height, it sends a tenth control instruction to the projection display module and simultaneously sends an eleventh control instruction to the screen lifting module. The tenth control instruction is used to instruct the projection display module to control the optical engine to stop emitting light beams, and the eleventh control instruction is used to instruct the screen lifting module to control the projection screen to continue descending; When the controller determines that the projection screen has descended to a third preset height, it sends a twelfth control instruction to the screen lifting module. The twelfth control instruction is used to instruct the screen lifting module to control the projection screen to stop descending; The controller controls the power module to disconnect from the projection display module and the screen lifting module respectively.

9. The method according to claim 8, wherein The projection device further includes a first trigger switch. The controller determines that the projection screen has descended to the first preset height, including: When the controller receives a first trigger signal sent by the screen lifting module, the controller determines that the projection screen has descended to the first preset height; Among them, the first trigger signal is triggered by the first trigger switch when the projection screen descends to the first preset height and sent to the screen lifting module.

10. The method according to claim 8, wherein The projection screen includes a lifting motor. The projection device further includes an encoder. The controller determines that the projection screen has descended to the first preset height, including: The controller receives a first descending height of the projection screen transmitted by the screen lifting module. The first descending height is determined by the screen lifting module based on a third rotation angle of the lifting motor detected by the encoder; When the difference between the second preset height and the first descending height is equal to the first preset height, the controller determines that the projection screen has descended to the first preset height.

11. The method according to claim 10, wherein After the controller sends the ninth control instruction to the screen lifting module, it further includes: The controller receives a second descending height of the projection screen transmitted by the screen lifting module. The second descending height is determined by the screen lifting module based on a fourth rotation angle of the lifting motor detected by the encoder; The controller determines a third descending height of the shutdown screen according to the descending curve segment; When the difference between the second descending height and the third descending height is greater than the difference threshold, the controller adjusts the descending speed of the shutdown screen, outputs the shutdown screen to the projection display module at the adjusted descending speed, and then returns to the step where the controller receives the second descending height of the projection screen transmitted by the screen lifting module; When the difference between the second descending height and the third descending height is less than or equal to the difference threshold, the controller continues to output the shutdown screen to the projection display module according to the descending curve segment.

12. The method according to any one of claims 8 - 11, wherein The projection device further includes a storage part, a flip cover transmission mechanism, a sliding cover transmission mechanism, a fourth trigger switch and a fifth trigger switch. After the controller sends a twelfth control instruction to the screen lifting module, it includes: The controller sends a thirteenth control instruction to the screen lifting module so that the controller receives a fourth trigger signal sent by the screen lifting module; The controller sends a fourteenth control instruction to the projection display module so that the controller receives a fifth trigger signal sent by the projection display module; Wherein, the thirteenth control instruction is used to instruct the screen lifting module to control the flip cover transmission mechanism to flip, the fourth trigger signal is triggered by the fourth trigger switch when the flip cover transmission mechanism blocks the lifting port of the storage part and is sent to the screen lifting module, the fourteenth control instruction is used to instruct the projection display module to control the sliding cover transmission mechanism to slide, and the fifth trigger signal is triggered by the fifth trigger switch when the sliding cover transmission mechanism blocks the light-transmitting area of the storage part and is sent to the projection display module.

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