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

Abstract

An embodiment of the present application discloses 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: the screen lifting module receives a power-on instruction; the screen lifting module controls the flip drive mechanism to flip based on the power-on instruction; when the screen lifting module receives a first trigger signal, it controls the lifting screen to rise based on the power-on instruction so as to pass through the lifting opening of the storage part and unfold. In the embodiment of the present application, the screen lifting module controls the flip drive mechanism to flip to avoid the lifting opening based on the received power-on instruction, and then controls the lifting screen to rise and unfold, ensuring the stability of the lifting screen when rising. In addition, when the lifting screen rises, it receives the light beam emitted by the projection host to display the power-on screen, thereby improving the power-on effect of the projection device.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of projection technology, and particularly to a power-on control method and a power-off control method for a projection device. Background Art

[0002] With the continuous development of technology, projection devices are increasingly applied to people's work and life. Currently, projection devices mainly include a projection host and a projection screen. Among them, the light-emitting port of the projection host 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 power-on control method and a power-off control method for a projection device, which can ensure the power-on effect and power-off effect of the projection device. The technical solutions are as follows:

[0004] A power-on control method for a projection device, the projection device includes a storage part, a projection host, a screen lifting module, a lifting screen, a flip drive mechanism, and a first trigger switch. The method is applied to the screen lifting module, and the method includes:

[0005] The screen lifting module receives a power-on instruction;

[0006] The screen lifting module controls the flip drive mechanism to flip based on the power-on instruction;

[0007] When the screen lifting module receives a first trigger signal, it controls the lifting screen to rise based on the power-on instruction to pass through the lifting port of the storage part and unfold;

[0008] Wherein, the first trigger signal is triggered by the first trigger switch when the flip drive mechanism avoids the lifting port and sent to the screen lifting module. When the lifting screen rises, it receives the light beam emitted by the projection host to display a power-on screen.

[0009] Optionally, the projection host includes a remote controller, and the power-on instruction is generated when the remote controller receives a first trigger instruction and sent to the screen lifting module.

[0010] Optionally, the projection host includes a control main board, and the power-on instruction is generated when the control main board receives a projection instruction and sent to the screen lifting module.

[0011] Optionally, the controlling the lifting screen to rise based on the power-on instruction to pass through the lifting port of the storage part and unfold includes:

[0012] The screen lifting module controls the lifting screen to rise to a first preset height at a preset speed based on the power-on instruction;

[0013] When the screen lifting module receives a start instruction, it controls the lifting screen to continue rising to a second preset height based on the power-on instruction, so as to unfold the lifting screen. The start instruction is used to indicate that the startup screen displayed on the lifting screen starts to rise according to the rising curve segment.

[0014] Optionally, the projection device further includes a second trigger switch, and the method further includes:

[0015] When the screen lifting module receives the second trigger signal, it determines that the lifting screen has risen to the first preset height. The second trigger signal is triggered by the second trigger switch when the lifting screen rises to the first preset height and sent to the screen lifting module.

[0016] Optionally, the projection device further includes an obstacle detection unit. Before the screen lifting module controls the lifting screen to rise based on the power-on instruction to pass through the lifting opening of the storage part and unfold, it further includes:

[0017] The screen lifting module receives an obstacle detection signal, which is detected by the obstacle detection unit and sent to the screen lifting module;

[0018] If the screen lifting module determines that there is an obstacle at the lifting opening of the storage part based on the obstacle signal, it returns to the step of the screen lifting module receiving the obstacle detection signal until the screen lifting module determines that there is no obstacle at the lifting opening of the storage part based on the obstacle signal.

[0019] A shutdown control method for a projection device, the projection device includes a storage part, a projection host, a screen lifting module, a lifting screen, a flip drive mechanism and a third trigger switch. The method is applied to the screen lifting module, and the method includes:

[0020] The screen lifting module receives a shutdown instruction;

[0021] The screen lifting module controls the lifting screen to descend based on the shutdown instruction so as to be retracted into the storage part. When the lifting screen is retracted, it receives the light beam emitted by the projection host to display a shutdown screen;

[0022] The screen lifting module controls the flip drive mechanism to flip based on the shutdown instruction so that the screen lifting module receives a third trigger signal;

[0023] Among them, the third trigger signal is triggered by the third trigger switch when the flip drive mechanism blocks the lifting opening of the storage part, and is sent to the screen lifting module.

[0024] Optionally, the projection host includes a remote controller, and the shutdown instruction is generated when the remote controller receives a second trigger instruction and sent to the screen lifting module.

[0025] Optionally, the projection host includes a control main board, and the shutdown instruction is generated when the control main board receives a projection shutdown instruction and sent to the screen lifting module.

[0026] Optionally, the screen lifting module controls the lifting screen to descend based on the shutdown instruction to be retracted into the storage part, including:

[0027] The screen lifting module controls the lifting screen to descend to a first preset height according to a pre-stored descending curve segment based on the shutdown instruction, and the shutdown instruction is also used to instruct the shutdown screen displayed on the lifting screen to start descending according to the descending curve segment;

[0028] The screen lifting module controls the lifting screen to continue descending at a preset speed to be retracted into the storage part.

[0029] Optionally, the projection device further includes an obstacle detection unit, and the method further includes:

[0030] The screen lifting module receives a detection distance, which is detected by the obstacle detection unit and sent to the screen lifting module;

[0031] When the screen lifting module determines that the detection distance is less than a distance threshold, it controls the lifting screen to pause descending and returns to the step where the screen lifting module receives the detection distance until the detection distance is greater than or equal to the distance threshold.

[0032] The beneficial effects of the technical solution provided by the embodiments of the present application at least include:

[0033] In the embodiments of the present application, the screen lifting module controls the flip drive mechanism to flip to avoid the lifting opening based on the received power-on instruction, and then controls the lifting screen to rise to unfold, ensuring the stability of the lifting of the lifting screen. In addition, when the lifting screen rises, it receives the light beam emitted by the projection host to display the power-on screen, thereby improving the power-on effect of the projection device. Description of the Drawings

[0034] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for description in the embodiments. Obviously, the drawings in the following description 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.

[0035] Figure 1 It is a schematic diagram of the system structure of a projection device provided by an embodiment of the present application;

[0036] Figure 2 It is a schematic diagram of the state of a storage part provided by an embodiment of the present application;

[0037] Figure 3 It is a schematic diagram of the state of another storage part provided by an embodiment of the present application;

[0038] Figure 4 It is a schematic flowchart of a power-on control method for a projection device provided by an embodiment of the present application;

[0039] Figure 5 It is a schematic diagram of an ascending curve segment provided by an embodiment of the present application;

[0040] Figure 6 It is a schematic flowchart of a power-off control method for a projection device provided by an embodiment of the present application;

[0041] Figure 7 It is a schematic diagram of a descending curve segment provided by an embodiment of the present application.

[0042] Reference numerals:

[0043] 1: Projection host; 2: Projection screen; 3: Storage part;

[0044] 21: Screen lifting module; 22: Lifting screen; 23: First trigger switch; 24: Flap transmission mechanism; 25: Encoder; 26: Second trigger switch; 27: Third trigger switch;

[0045] 31: First accommodating part; 32: Second accommodating part; 33: Translucent area; 34: Lifting opening. Detailed implementation manners

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following further describes the embodiments of the present application in detail with reference to the drawings.

[0047] Before explaining in detail the ascending method and control method of the projection screen in the embodiments of the present application, the system structure diagram and the physical structure diagram of the projection device are first explained.

[0048] Figure 1 The system structure diagram of a projection device according to an embodiment of the present application is illustrated. As Figure 1 shown, the projection device includes a projection host 1 and a projection screen 2. The projection screen 2 includes a screen lifting module 21 and a lifting screen 22. The screen lifting module 21 is respectively connected to the projection host 1 and the lifting screen 22. The screen lifting module 21 is configured to control the lifting of the lifting screen 22 based on a received power-on instruction or power-off instruction, so as to realize the unfolding or retraction of the lifting screen 22. The projection host 1 is configured to emit a light beam to display an image on the lifting screen 22.

[0049] In an embodiment of the present application, the projection host 1 includes a power supply board, a display board, a control main board, and an optical engine. The power supply board is respectively connected to the display board, the control main board, and the optical engine. The power supply board is further configured to be connected to an external power supply. The display board is electrically connected to the control main board and the optical engine respectively. The optical engine can emit a light beam to the lifting screen 22 under the cooperation of the power supply board, the display board, and the control main board.

[0050] Among them, the power supply board can output a voltage or current drive signal, thereby facilitating the power supply for devices such as the display board, the control main board, and the optical engine to ensure the normal use of the projection device. The control main board is a Television (TV) main board. The plug-in end of the control main board is used to connect external devices such as a computer, a mobile phone, and a USB flash drive. The control main board is configured to receive multimedia data transmitted by the external device, decode the multimedia data to obtain a video signal, and then transmit the decoded video signal to the display board. The display board is configured to receive the video signal transmitted by the control main board, and then convert the received video signal into a drive signal and transmit it to the optical engine, so that the optical engine can emit a light beam based on the drive signal, and then realize the display of the image on the lifting screen 22.

[0051] In addition, the projection host 1 includes a remote controller, and the remote controller is communicatively connected to the control main board. The remote controller can determine a remote control signal and transmit the determined remote control signal to the control main board, so that the control main board can control the switching of the display image based on the remote control signal.

[0052] Among them, the remote controller includes a button, and the button is communicatively connected to the control main board. In this way, the remote controller can detect the user's trigger on the button to determine the corresponding encoded signal, and then transmit the encoded signal to the control main board.

[0053] In combination with the above description of the projection host 1, during the startup or shutdown process of the projection device, when controlling the lifting of the lifting screen 22, the startup instruction or shutdown instruction received by the screen lifting module 21 may be sent by the control main board, that is, the control main board generates a startup instruction for controlling the lifting of the lifting screen 22 to be raised or a shutdown instruction for controlling the lifting of the lifting screen 22 based on the received instruction, and transmits the generated startup instruction or shutdown instruction to the screen lifting module 21; of course, the startup instruction or shutdown instruction received by the screen lifting module 21 may be sent by the remote control controller, that is, after the user triggers the startup instruction for controlling the lifting of the lifting screen 22 to be raised or the shutdown instruction for controlling the lifting of the lifting screen 22 to be retracted on the remote control controller, the remote control controller generates a corresponding coded signal, and then transmits the startup instruction or shutdown instruction to the screen lifting module 21 in the form of a coded signal.

[0054] In the embodiment of the present application, during the lifting process of the lifting screen 22, when the lifting screen 22 rises or falls to the first preset height, it is at a critical height between being able to receive the light beam emitted by the optical engine and not being able to receive the light beam emitted by the optical engine, that is, if the lifting screen 22 continues to rise on the basis of the first preset height, it can receive the light beam emitted by the optical engine; if the lifting screen 22 continues to fall on the basis of the first preset height, it cannot receive the light beam emitted by the optical engine; when the lifting screen 22 rises to the second preset height, it can display a complete picture based on the light beam emitted by the optical engine, and at this time the lifting screen 22 is in an extended state; when the lifting screen 22 falls to the third preset height, it cannot receive the light beam emitted by the optical engine at all, and at this time the lifting screen 22 is in a retracted state.

[0055] Among them, the lifting screen 22 includes a base, a curling transmission mechanism, a lifting transmission mechanism and a screen piece. The curling transmission mechanism is limited on the base, and the lifting transmission mechanism is fixed on the base. The two opposite sides of the screen piece are fixedly connected to the curling transmission mechanism and the lifting transmission mechanism respectively. The curling transmission mechanism and the lifting transmission mechanism can cooperate to realize the folding or unfolding of the screen piece.

[0056] Among them, the lifting transmission mechanism is an electric lifting mechanism, that is, the lifting transmission mechanism includes a lifting motor and a lifting frame, the lifting motor is electrically connected to the screen lifting module 21, and the lifting motor is also in driving connection with the lifting frame. The curling transmission mechanism is an energy storage curling mechanism or an electric curling mechanism. When the curling transmission mechanism is an electric curling mechanism, the curling transmission mechanism includes a curling motor and a reel, the curling motor is electrically connected to the screen lifting module 21, and the curling motor is in driving connection with the reel. At this time, the screen lifting module 21 is used to control the start and stop of the lifting motor and the curling motor to realize the unfolding or folding of the screen.

[0057] Among them, both the lifting motor and the curling motor have the function of power-off braking, that is, the lifting motor and the coiling motor will stop after power-off, so as to ensure that the screen film will not fall naturally and improve the reliability of the projection screen 2.

[0058] Optionally, as Figure 1 shown, the projection screen 2 includes a second trigger switch 26, and the second trigger switch 26 is electrically connected to the screen lifting module 21. The second trigger switch 26 can generate a second trigger signal when the lifting screen 22 rises to a first preset height and transmit it to the screen lifting module 21.

[0059] Optionally, as Figure 1 shown, the projection screen 2 includes an encoder 25, and the encoder 25 is electrically connected to the screen lifting module 21. The encoder 25 is installed on the lifting motor. The encoder 25 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 21. At this time, the screen lifting module 21 can determine the rising height or falling height of the lifting screen 22 according to the detected rotation angle, and can determine the rising speed or falling speed of the lifting screen 22 according to the detected angular velocity.

[0060] Optionally, the screen lifting module 21 can determine the rising speed or falling speed of the lifting screen 22 according to the detected angular velocity and the transmission ratio between the lifting motor and the lifting frame, and can determine the rising height or falling 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 falling speed of the lifting screen 22 and the rising height or falling height in other ways according to 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.

[0061] Exemplarily, in the embodiments of the present application, the rising height or falling height of the lifting screen 22 can be determined according to the detected rotation angle by the following formula.

[0062] H = 16.6×θ + 481

[0063] Among them, H refers to the rising height or falling height of the lifting screen 22, and θ refers to the rotation angle of the lifting motor.

[0064] In the embodiments of the present application, the projection device includes a storage part 3. The storage part 3 has a first accommodation part 31 and a second accommodation part 32, as well as a light-transmitting area 33 communicating with the first accommodation part 31 and a lifting opening 34 communicating with the second accommodation part 32. Figure 2 and Figure 3 illustrates a schematic structural diagram of a storage part 3 in two different states in the embodiments of the present application.

[0065] Among them, the projection host 1 and the screen lifting module 21 are located in the first accommodating portion 31, the lifting screen 22 is fixed in the second accommodating portion 32, the light beam emitted by the projection host 1 can pass through the light-transmitting area 33, and the lifting screen 22 can be lifted through the lifting opening 34. In addition, the second trigger switch 26 is installed above the lifting opening 34 of the accommodating portion 3, and the height where the second trigger switch 26 is located is equal to the first preset height.

[0066] Optionally, as Figure 1 shown, the projection screen 2 further includes a flip drive mechanism 24, a first trigger switch 23, and a third trigger switch 27. As Figure 2 and Figure 3 shown, the flip drive mechanism 24 is installed in the second accommodating portion 32 and is located at the lifting opening 34. The flip drive mechanism 24 is electrically connected to the screen lifting module 21, and the screen lifting module 21 can control the flip drive mechanism 24 to flip to switch between blocking the lifting opening 34 and avoiding the lifting opening 34.

[0067] Among them, both the first trigger switch 23 and the third trigger switch 27 are electrically connected to the screen lifting module 21. The first trigger switch 23 can generate a first trigger signal when the flip drive mechanism 24 flips to avoid the lifting opening 34 and transmit it to the screen lifting module 21. The third trigger switch 27 can generate a third trigger signal when the flip drive mechanism 24 flips to block the lifting opening 34 and transmit it to the screen lifting module 21.

[0068] Optionally, the projection screen 2 further includes an obstacle detection unit. The obstacle detection unit is electrically connected to the screen lifting module 21. The obstacle detection unit is used to detect whether there is an obstacle above the lifting screen 22 and whether there is an obstacle approaching the lifting screen 22, and transmit the detected obstacle signal or detection distance to the screen lifting module 21. Among them, the obstacle detection unit includes an infrared sensor, a radar sensor, etc.

[0069] Next, the power-on control method of the projection device according to the embodiments of the present application will be explained.

[0070] Figure 4 The flowchart 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 screen lifting module described in the above embodiment. As Figure 4 shown, this method includes the following steps.

[0071] During the process of controlling the projection device to power on, it mainly includes controlling the lifting screen to unfold. Thus, in the following embodiments of the present application, the unfolding of the lifting screen is realized through the following steps 401-step 403.

[0072] Step 401: The screen lifting module receives a power-on instruction.

[0073] Among them, the screen lifting module serves as the control unit for the lifting screen. Therefore, in order to ensure the unfolding timing of the lifting screen, the control of the lifting screen can be realized when the screen lifting module receives the power-on instruction.

[0074] In the embodiment of the present application, in combination with the above explanation of the projection host, when the projection host includes a remote controller, the power-on instruction can be generated when the remote controller receives the first trigger instruction and sent to the screen lifting module. That is to say, in order to realize the control of the lifting screen, the screen lifting module needs to receive the power-on instruction sent by the remote controller. Alternatively, when the projection host includes a control main board, the power-on instruction can be generated when the control main board receives the projection instruction and sent to the screen lifting module. That is to say, in order to realize the control of the lifting screen, the screen lifting module needs to receive the power-on instruction sent by the control main board.

[0075] Step 402: The screen lifting module controls the flip drive mechanism to flip based on the power-on instruction.

[0076] When the projection device includes a flip drive mechanism, the flip drive mechanism may be in a position blocking the lifting opening of the storage part. Therefore, in order to ensure the normal rising of the lifting screen, the flip drive mechanism can be controlled to flip first so that the flip drive mechanism is in a position avoiding the lifting opening of the storage part.

[0077] Optionally, the flip drive mechanism includes an electric telescopic rod and a flip cover, and the electric telescopic rod is rotatably connected to the flip cover. At this time, the screen lifting module can control the electric telescopic rod to be powered on, so as to drive the flip cover to flip through the change of the length of the electric telescopic rod.

[0078] Step 403: When the screen lifting module receives the first trigger signal, it controls the lifting screen to rise based on the power-on instruction, so as to pass through the lifting opening of the storage part and unfold.

[0079] Among them, when the projection device includes a first trigger switch, the first trigger switch generates a first trigger signal when the flip drive mechanism avoids the lifting opening and sends the first trigger signal to the screen lifting module. That is to say, the first trigger signal is triggered by the first trigger switch when the flip drive mechanism avoids the lifting opening and sent to the screen lifting module. In this way, when the screen lifting module receives the first trigger signal, it is determined that the flip drive mechanism has avoided the lifting opening on the storage part, and at this time the lifting screen can be lifted and lowered normally.

[0080] In the embodiments of the present application, as can be seen from the description of the above embodiments, before the lifting screen rises to the first preset height, there is no situation where the lifting screen receives the light beam, so there is no need to consider the synchronization or non-synchronization of the lifting screen and the startup screen. After the lifting screen rises to the first preset height, the lifting screen is used to receive the light beam emitted by the projection host to display the startup screen, that is, the lifting screen receives the light beam emitted by the projection host when it rises to display the startup screen. At this time, the synchronization of the startup screen and the lifting screen needs to be considered. Therefore, the rising process of the lifting screen can be split and controlled according to the first preset height. Specifically, it can be implemented through the following steps (1)-(2).

[0081] (1) The screen lifting module controls the lifting screen to rise to the first preset height at a preset speed based on the startup instruction.

[0082] Since there is no need to consider the synchronization problem with the startup screen before the lifting screen rises to the first preset height, this preset speed can be set arbitrarily. For example, the screen lifting module can control the lifting screen to rise to the first preset height at a constant speed or accelerate to rise to the first preset height.

[0083] Among them, during the rising process of the lifting screen, the following method can be used to determine that the lifting screen rises to the first preset height.

[0084] In some embodiments, when the projection device includes a second trigger switch, the second trigger switch will generate a second trigger signal when the lifting screen rises to the first preset height and send the second trigger signal to the screen lifting module. That is, the second trigger signal is triggered by the second trigger switch when the lifting screen rises to the first preset height and sent to the screen lifting module. Thus, when the screen lifting module receives the second trigger signal, it is determined that the lifting screen rises to the first preset height.

[0085] In other embodiments, when the lifting screen includes a lifting motor and the projection device includes an encoder, the encoder can be installed on the lifting motor at this time to detect the first rotation angle of the lifting motor and transmit the detected first rotation angle to the screen lifting module. At this time, the screen lifting module can determine the first rising height of the lifting screen according to the received first rotation angle; then when the screen lifting module determines that the difference between the first rising height and the first preset height is less than the difference threshold, it is determined that the lifting screen rises to the first preset height. At this time, the first preset height and the difference threshold are stored in the screen lifting module.

[0086] Among them, the difference threshold can be set in advance. For example, the difference threshold is 2 mm, 3 mm or 5 mm, etc.

[0087] In the embodiments of the present application, in addition to determining that the lifting screen rises to the first preset height through the above two methods, it is also possible to determine that the lifting screen rises to the first preset height through other methods. For example, when the screen lifting module receives a confirmation instruction, it determines that the lifting 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.

[0088] Further, after the lifting screen rises to the first preset height, the projection host may not be ready, that is, the projection host may not be able to emit light beams in time at this time. Therefore, when the lifting screen rises to the first preset height, the screen lifting module can control the lifting screen to pause rising until the projection host is in a ready state.

[0089] (2) When the screen lifting module receives a start instruction, it controls the lifting screen to continue rising to the second preset height according to the pre-stored rising curve segment based on the power-on instruction to unfold the lifting screen.

[0090] Among them, the start instruction is used to indicate that the power-on screen displayed on the lifting screen starts to rise according to the rising curve segment. It can be seen that the projection host is already ready. At this time, in order to ensure the synchronization of the power-on screen formed by the light beam emitted by the projection host with the lifting screen during the rising process, the screen lifting module needs to control the lifting screen to continue rising based on the power-on instruction. In addition, in order to ensure the synchronization of the rising height of the lifting screen with the rising height of the power-on screen, the screen lifting module pre-stores a rising curve segment, and then controls the lifting screen to rise according to this rising curve segment when the lifting screen rises.

[0091] Among them, as Figure 5 shown, the rising curve segment is composed of multiple rising times and multiple rising heights corresponding one-to-one to the multiple rising times. The multiple rising heights refer to the height values between the first preset height and the second preset height. In this way, when the controller receives the second control instruction, it controls the lifting screen to rise to ensure the synchronization of the lifting screen and the power-on screen during the rising process.

[0092] It should be noted that when the lifting screen rises according to the rising curve segment, there may be situations such as the lifting motor of the lifting screen slipping and the lifting frame wearing, resulting in the actual rising height of the lifting screen being different from the rising height according to the rising curve segment. At this time, it is necessary to modify the rising height of the lifting screen to further ensure the synchronization of the power-on screen and the lifting screen during the rising process.

[0093] For example, the synchronization of the power-on screen and the lifting screen during the rising process can be ensured through the following steps.

[0094] The screen lifting module receives the second rotation angle detected by the encoder and determines the second rising height of the lifting screen based on the second rotation angle; when the screen lifting module receives the first adjustment instruction based on the second rising height, it adjusts the rising speed of the lifting screen based on the first adjustment instruction and returns to the step of the screen lifting module receiving the second rotation angle detected by the encoder until the screen lifting module receives the pause adjustment instruction based on the second rising height.

[0095] Among them, the first adjustment instruction is also used to indicate that the startup screen of the projection device is out of sync with the lifting screen. After the screen lifting module receives the pause adjustment, it continues to control the lifting screen to rise according to the rising curve segment.

[0096] In the embodiment of the present application, before the screen lifting module controls the lifting screen to rise based on the startup instruction to pass through the lifting opening of the storage part and unfold, there may be obstacles above the lifting opening of the storage part, and such obstacles may hinder the rising of the lifting screen. Therefore, to ensure the normal rising of the lifting screen, the projection screen further includes an obstacle detection unit. At this time, before the screen lifting module controls the lifting screen to rise based on the startup instruction, it can also be detected by the obstacle detection unit to confirm that there are no obstacles above the lifting opening of the storage part.

[0097] Specifically, the screen lifting module receives the obstacle detection signal, and the obstacle detection signal is detected by the obstacle detection unit and sent to the screen lifting module; if the screen lifting module determines that there is an obstacle at the lifting opening of the storage part based on the obstacle signal, it returns to the step of the screen lifting module receiving the obstacle detection signal until the screen lifting module determines that there is no obstacle at the lifting opening of the storage part based on the obstacle signal.

[0098] Exemplarily, the obstacle misdetection unit is a radar sensor. The radar sensor can emit electromagnetic waves above the lifting opening. When the radar sensor receives the reflected wave within the preset time period, it sends a high-level signal to the screen lifting module. At this time, the screen lifting module can determine that there is an obstacle above the lifting opening according to the high-level signal; when the radar sensor does not receive the reflected wave within the preset time period, it sends a low-level signal to the screen lifting module. At this time, the screen lifting module can determine that there is no obstacle above the lifting opening according to the low-level signal.

[0099] In the embodiment of the present application, based on the received power-on instruction, the screen lifting module first controls the flip drive mechanism to flip to avoid the lifting opening of the storage part, ensuring that the lifting screen can rise normally. Then, after controlling the lifting screen to rise to the first preset height, when receiving the start instruction, the lifting screen is controlled to continue rising according to the pre-stored rising curve segment, thereby ensuring the synchronization between the lifting screen and the power-on screen during the rising process and guaranteeing the display effect of the power-on screen on the lifting screen. Additionally, during the rising process of the lifting screen, the rising speed of the lifting screen can be adjusted based on the second rising height of the lifting screen to further ensure the synchronization between the power-on screen and the lifting screen during the rising process, thereby further improving the reliability of the projection device.

[0100] Next, a shutdown control method for a projection device according to an embodiment of the present application will be explained.

[0101] Figure 6 The flowchart of a shutdown control method for a projection device according to an embodiment of the present application is exemplified. This method is applied to the screen lifting module described in the above embodiment. As Figure 6 shown, this method includes the following steps.

[0102] During the process of controlling the projection device to shut down, it mainly includes controlling the lifting screen to retract. Thus, in the following, the retraction of the lifting screen is achieved through the following steps 601 - step 603 in the embodiment of the present application.

[0103] Step 601: The screen lifting module receives a shutdown instruction.

[0104] Among them, as the control unit of the lifting screen, the screen lifting module can control the lifting screen when it receives the shutdown instruction to ensure the retraction timing of the lifting screen.

[0105] In the embodiment of the present application, in combination with the above explanation of the projection host, when the projection host includes a remote controller, the shutdown instruction can be generated when the remote controller receives the second trigger instruction and sent to the screen lifting module. That is, in order to control the lifting screen, the screen lifting module needs to receive the shutdown instruction sent by the remote controller. Or, when the projection host includes a control main board, the shutdown instruction can be generated when the control main board receives the projection shutdown instruction and sent to the screen lifting module. That is, in order to control the lifting screen, the screen lifting module needs to receive the shutdown instruction sent by the control main board.

[0106] Step 602: The screen lifting module controls the lifting screen to descend based on the shutdown instruction to retract into the storage part, and the lifting screen receives the light beam emitted by the projection host to display the shutdown screen when retracting.

[0107] In the embodiments of the present application, as can be seen from the description of the above embodiments, before the lifting screen descends to the first preset height, the lifting screen is used to receive the light beam emitted by the projection host to display the shutdown screen, that is, when the lifting screen is retracted, it is used to receive the light beam emitted by the projection host to display the shutdown screen. At this time, the problem of synchronization between the shutdown screen and the lifting screen needs to be considered. After the lifting screen descends to the first preset height until it is retracted, there is no situation where the lifting screen receives the light beam, so there is no need to consider the synchronization problem between the lifting screen and the shutdown screen. Therefore, the descending process of the lifting screen can be split and controlled according to the first preset height. Specifically, it can be implemented through the following steps (1)-(2).

[0108] (1) The screen lifting module controls the lifting screen to descend to the first preset height according to the pre-stored descending curve segment based on the shutdown instruction.

[0109] Among them, the shutdown instruction is also used to instruct the shutdown screen displayed on the lifting screen to start descending according to the descending curve segment. It can be seen that the projection host is ready to shut down. At this time, in order to ensure the synchronization between the shutdown screen formed by the light beam emitted by the projection host and the lifting screen during the descending process, the screen lifting module can control the lifting screen to descend based on the shutdown instruction. In addition, in order to ensure the synchronization of the descending height of the lifting screen and the descending height of the shutdown screen, the screen lifting module pre-stores a descending curve segment, and then controls the lifting screen to descend according to this descending curve segment when the lifting screen descends.

[0110] As Figure 7 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. In this way, when the controller receives the fourth control instruction, it controls the lifting screen to descend to ensure the synchronization between the lifting screen and the shutdown screen during the descending process.

[0111] It should be noted that when the lifting screen descends according to the descending curve segment, there may be situations such as the lifting motor included in the lifting screen slipping and the lifting frame wearing, resulting in the actual descending height of the lifting screen being different from the descending height according to the descending curve segment. At this time, it is necessary to adjust the descending height of the lifting screen to further ensure the synchronization between the shutdown screen and the lifting screen during the descending process.

[0112] Exemplarily, the synchronization between the shutdown screen and the lifting screen during the descending process can be ensured through the following steps.

[0113] The screen lifting module receives the third rotation angle detected by the encoder and determines the first descending height of the lifting screen based on the third rotation angle; when the screen lifting module receives the second adjustment instruction based on the first descending height, it adjusts the descending speed of the lifting screen based on the second adjustment instruction and returns to the step of the screen lifting module receiving the third rotation angle detected by the encoder until the screen lifting module receives the pause adjustment instruction based on the first descending height.

[0114] Among them, the second adjustment instruction is also used to indicate that the shutdown screen of the projection device is out of sync with the lifting screen. When the screen lifting module receives the pause adjustment instruction, it continues to control the lifting screen to descend according to the descending curve segment.

[0115] (2) The screen lifting module controls the lifting screen to continue descending at a preset speed based on the shutdown instruction to retract it into the storage part.

[0116] When the lifting screen descends to the first preset height, at this time the lifting screen is at the critical height, and in order to ensure the retraction of the lifting screen, the controller can control the lifting screen to continue descending.

[0117] Since when the lifting screen continues to descend at the first preset height, there is no need to consider the synchronization problem with the shutdown screen, therefore, this preset speed can be set arbitrarily. Exemplarily, the screen lifting module can control the lifting screen to descend at a constant speed until it is retracted.

[0118] Combined with the above embodiments, the third preset height refers to the height corresponding to when the lifting screen is retracted. From this, it can be seen that in the embodiments of the present application, it is possible to determine whether the lifting screen is retracted by determining whether the lifting screen descends to the third preset height.

[0119] Among them, in the case where the projection screen includes an encoder, the method for the screen lifting module to determine whether the lifting screen descends to the third preset height is the same as or similar to the method for determining whether the lifting screen ascends to the first preset height in the above embodiments, and the embodiments of the present application will not elaborate on this.

[0120] In the embodiments of the present application, during the descending process of the lifting screen, it is possible that a user approaches the lifting screen, and thus it is possible that the user obstructs the descending of the lifting screen. Therefore, the projection device further includes an obstacle detection unit. At this time, during the descending process of the lifting screen, it can also be detected by the obstacle detection unit to confirm that the distance between the user and the lifting screen is greater than the distance threshold.

[0121] Specifically, the screen lifting module receives the detected distance. When the screen lifting module determines that the detected distance is less than the distance threshold, it controls the lifting screen to pause descending and returns to the step of the screen lifting module receiving the detected distance until the detected distance is greater than or equal to the distance threshold.

[0122] Among them, the detection distance is detected by the obstacle detection unit and sent to the screen lifting module. The distance threshold can be set in advance. For example, the distance threshold is 0.5 meters, 1 meter, etc.

[0123] Step 603: The screen lifting module controls the flip drive mechanism to flip based on the shutdown instruction, so that the screen lifting module receives the third trigger signal.

[0124] When the projection device includes a flip drive mechanism, the flip drive mechanism may be in a position avoiding the lifting opening of the storage part. Therefore, in order to better protect the lifting screen through the flip drive mechanism and prevent dirt from entering the second accommodation part, the flip drive mechanism can be controlled to flip so that the flip drive mechanism is in a position blocking the lifting opening of the storage part.

[0125] Optionally, the flip drive mechanism includes an electric telescopic rod and a flip cover, and the electric telescopic rod is rotatably connected to the flip cover. At this time, the screen lifting module can control the electric telescopic rod to be powered on, so as to drive the flip cover to flip through the change in the length of the electric telescopic rod.

[0126] Among them, when the projection device includes a third trigger switch, the third trigger switch generates a third trigger signal when the flip drive mechanism blocks the lifting opening and sends the third trigger signal to the screen lifting module. That is, the third trigger signal is triggered by the third trigger switch when the flip drive mechanism blocks the lifting opening and sent to the screen lifting module. In this way, when the screen lifting module receives the third trigger signal, it is determined that the flip drive mechanism blocks the lifting opening on the storage part, and at this time, the lifting screen can be effectively protected.

[0127] In the embodiments of the present application, the screen lifting module controls the lifting screen to descend to the first preset height according to the pre-stored descending curve segment based on the received shutdown instruction, so as to ensure the synchronization between the lifting screen and the shutdown screen during the descending process, and ensure the display effect of the shutdown screen on the lifting screen; then after controlling the lifting screen to be retracted, the flip drive mechanism is controlled to flip to block the lifting opening of the storage part, so as to effectively protect the lifting screen in the second accommodation part. In addition, during the descending process of the lifting screen, the descending speed of the lifting screen can also be adjusted based on the first descending height of the lifting screen to further ensure the synchronization between the shutdown screen and the lifting screen during the descending process, and further improve the reliability of the projection device.

[0128] 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 principle of the embodiments of the present application shall be included in 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 storage part, a projection host, a screen lifting module, a lifting screen, a flip driving mechanism, and a first trigger switch. Among them, the storage part has a first accommodation part and a second accommodation part, as well as a light-transmitting area communicating with the first accommodation part and a lifting opening communicating with the second accommodation part. The projection host and the screen lifting module are located in the first accommodation part, the lifting screen is fixed in the second accommodation part, the light beam emitted by the projection host can pass through the light-transmitting area, and the lifting screen can be lifted through the lifting opening. The flip driving mechanism is installed in the second accommodation part and is located at the lifting opening. The flip driving mechanism is electrically connected to the screen lifting module, and the screen lifting module can control the flip driving mechanism to flip to switch between blocking the lifting opening and avoiding the lifting opening; The method is applied to the screen lifting module, and the method includes: The screen lifting module receives a power-on instruction; The screen lifting module controls the flip driving mechanism to flip based on the power-on instruction. The first trigger switch can generate a first trigger signal when the flip driving mechanism flips to avoid the lifting opening and transmit it to the screen lifting module; When the screen lifting module receives the first trigger signal, it controls the lifting screen to rise to pass through the lifting opening of the storage part and unfold; Among them, when the lifting screen rises, it receives the light beam emitted by the projection host to display a power-on screen.

2. The method according to claim 1, characterized in that, The projection host includes a remote controller. The power-on instruction is generated when the remote controller receives a first trigger instruction and sent to the screen lifting module.

3. The method according to claim 1, characterized in that, The projection host includes a control main board. The power-on instruction is generated when the control main board receives a projection instruction and sent to the screen lifting module.

4. The method according to any one of claims 1 to 3, characterized in that The controlling the lifting screen to rise based on the power-on instruction to pass through the lifting opening of the storage part and unfold includes: The screen lifting module controls the lifting screen to rise to a first preset height at a preset speed based on the power-on instruction; When the screen lifting module receives a start instruction, it controls the lifting screen to continue rising to a second preset height based on the power-on instruction according to a pre-stored rising curve segment to unfold the lifting screen. The start instruction is used to indicate that the power-on screen displayed by the lifting screen starts to rise according to the rising curve segment.

5. The method according to claim 4, wherein The projection device further includes a second trigger switch, and the method further includes: When the screen lifting module receives a second trigger signal, it determines that the lifting screen has risen to the first preset height. The second trigger signal is triggered by the second trigger switch when the lifting screen rises to the first preset height and sent to the screen lifting module.

6. The method according to claim 1, wherein The projection device further includes an obstacle detection unit. Before controlling the lifting screen to rise based on the power-on instruction to pass through the lifting opening of the storage part, it further includes: The screen lifting module receives an obstacle detection signal. The obstacle detection signal is detected by the obstacle detection unit and sent to the screen lifting module; If the screen lifting module determines that there is an obstacle at the lifting opening of the receiving part based on the obstacle signal, return to the step where the screen lifting module receives the obstacle detection signal until the screen lifting module determines that there is no obstacle at the lifting opening of the receiving part based on the obstacle signal.

7. A shutdown control method for a projection device, characterized in that, The projection device includes a receiving part, a projection host, a screen lifting module, a lifting screen, a flip cover transmission mechanism, and a third trigger switch. The receiving part has a first accommodating part and a second accommodating part, as well as a light-transmitting area communicating with the first accommodating part and a lifting opening communicating with the second accommodating part. The projection host and the screen lifting module are located in the first accommodating part, the lifting screen is fixed in the second accommodating part, the light beam emitted by the projection host can pass through the light-transmitting area, and the lifting screen can be lifted through the lifting opening. The flip cover transmission mechanism is installed in the second accommodating part and is located at the lifting opening. The flip cover transmission mechanism is electrically connected to the screen lifting module, and the screen lifting module can control the flip cover transmission mechanism to flip to switch between blocking the lifting opening and avoiding the lifting opening. The method is applied to the screen lifting module, and the method includes: The screen lifting module receives a shutdown instruction. The screen lifting module controls the lifting screen to descend based on the shutdown instruction to be retracted into the receiving part. When the lifting screen is retracted, it receives the light beam emitted by the projection host to display a shutdown screen. After the screen lifting module controls the lifting screen to be retracted, it controls the flip cover transmission mechanism to flip. The third trigger switch can generate a third trigger signal when the flip cover transmission mechanism flips to block the lifting opening and transmit it to the screen lifting module.

8. The method according to claim 7, wherein The projection host includes a remote controller. The shutdown instruction is generated when the remote controller receives a second trigger instruction and sent to the screen lifting module.

9. The method according to claim 7, wherein The projection host includes a control main board. The shutdown instruction is generated when the control main board receives a projection shutdown instruction and sent to the screen lifting module.

10. The method according to any one of claims 7-9, characterized in that, The screen lifting module controls the lifting screen to descend based on the shutdown instruction to be retracted into the receiving part, including: The screen lifting module controls the lifting screen to descend to a first preset height according to a pre-stored descending curve segment based on the shutdown instruction. The shutdown instruction is also used to instruct the shutdown screen displayed by the lifting screen to start descending according to the descending curve segment. The screen lifting module controls the lifting screen to continue descending at a preset speed to be retracted into the receiving part.

11. The method according to claim 7, wherein The projection device further includes an obstacle detection unit, and the method further includes: The screen lifting module receives a detection distance, which is detected by the obstacle detection unit and sent to the screen lifting module. When the screen lifting module determines that the detection distance is less than a distance threshold, it controls the lifting screen to pause descending and returns to the step where the screen lifting module receives the detection distance until the detection distance is greater than or equal to the distance threshold.

Images