Laser television and control method of projection screen

Abstract

The embodiment of the invention belongs to the technical field of display, and provides a laser television and a control method of a projection screen, the laser television comprises a laser projection device and a liftable projection screen, and the liftable projection screen comprises a first motor used for driving the projection screen to lift and a second motor used for driving the projection screen to fold and unfold; when the laser projection equipment receives a preset signal, a control signal is sent to the control module; the control module controls the two motors to work according to the control signal and drives the projection screen to move. In the moving process of the projection screen, the control module adjusts the rotating speed of the first motor and the rotating speed of the second motor according to the operation parameters of the first motor and the rotating speed signals corresponding to the operation parameters; height information of the projection screen is determined and sent to the laser projection equipment according to the operation parameters; and the laser projection equipment projects an image matched with the height information to the projection screen. The situation that the screen shakes or wrinkles occur in the lifting process is reduced, and the picture display effect is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and more specifically, to a control method for a laser television and a projection screen. Background Art

[0002] Laser TV includes a projection screen and a laser projection device. The laser projection device can project images onto the projection screen to achieve functions such as video playback.

[0003] Currently, in order to reduce the size of laser TVs, the projection screen of laser TVs is a liftable screen. However, during the lifting and lowering process of the projection screen, the screen may shake or wrinkle. Summary of the Invention

[0004] An exemplary embodiment of the present application provides a method for controlling a laser television and a projection screen, which can reduce shaking and wrinkling of the projection screen during the screen raising and lowering process.

[0005] In a first aspect, the present application provides a laser television, comprising a laser projection device and a liftable projection screen, wherein the liftable projection screen comprises a projection screen, a control module, a first motor for driving the projection screen to be raised and lowered, and a second motor for driving the projection screen to be retracted and extended;

[0006] The laser projection device is configured to send a control signal for controlling the lifting and lowering of the screen to the control module when receiving a preset signal;

[0007] The control module is configured to drive the projection screen to move by controlling the first motor and the second motor to operate according to the control signal;

[0008] During the movement of the projection screen, the control module is configured to determine operating parameters of the first motor, adjust the speed of the first motor according to the operating parameters and a speed signal corresponding to the operating parameters, and adjust the speed of the second motor according to the adjusted speed of the first motor;

[0009] During the movement of the projection screen, the control module is further configured to determine height information of the projection screen according to operating parameters of the first motor, and send the height information to the laser projection device;

[0010] During the movement of the projection screen, the laser projection device is used to project an image matching the height information onto the projection screen according to the height information.

[0011] In a second aspect, the present application provides a method for controlling a projection screen, which is applied to the laser television described in any one of the first aspects above, wherein the laser television includes a laser projection device and a liftable projection screen, wherein the liftable projection screen includes a projection screen, a control module, a first motor for driving the projection screen to be raised and lowered, and a second motor for driving the projection screen to be retracted and extended;

[0012] When the laser projection device receives a preset signal, a control signal for controlling the screen to be raised or lowered is sent to the control module via the laser projection device;

[0013] The control module controls the first motor and the second motor to operate according to the control signal, thereby driving the projection screen to move;

[0014] During the movement of the projection screen, the control module determines operating parameters of the first motor, adjusts the speed of the first motor according to the operating parameters and a speed signal corresponding to the operating parameters, and adjusts the speed of the second motor according to the adjusted speed of the first motor;

[0015] During the movement of the projection screen, the control module determines the height information of the projection screen according to the operating parameters of the first motor, and sends the height information to the laser projection device;

[0016] During the movement of the projection screen, the laser projection device projects an image matching the height information onto the projection screen according to the height information.

[0017] In a third aspect, the present application provides a computer-readable storage medium having computer-executable instructions stored thereon. When the computer-executable instructions are executed by a processor, the method described in the second aspect is implemented.

[0018] The computer-readable storage medium provided in the embodiment of the present application can execute the technical solutions in the above method embodiments, and its beneficial effects are similar and will not be repeated here.

[0019] In a fourth aspect, the present application provides a computer program product, comprising a computer program, which implements the method described in the second aspect when executed by a processor.

[0020] The computer program product provided in the embodiment of the present application can execute the technical solutions in the above method embodiments, and its beneficial effects are similar, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the implementation methods in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of an existing laser TV provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of an operation scenario between a laser TV and a control device provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of a laser TV provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of another laser TV provided in an embodiment of the present application;

[0026] Figure 5 A schematic diagram of the internal structure of a laser TV provided in an embodiment of the present application;

[0027] Figure 6 A flow chart of a method for adjusting the motor speed by a control module provided in an embodiment of the present application;

[0028] Figure 7 A schematic structural diagram of a first motor provided in an embodiment of the present application;

[0029] Figure 8 A schematic diagram of an operating curve with a rotation angle range of 0 to 138 provided in an embodiment of the present application;

[0030] Figure 9 A schematic diagram of an operating curve with a rotation angle range of 138 to 350 provided in an embodiment of the present application;

[0031] Figure 10 A schematic diagram of an operation curve with a rotation angle range of 350 to 680 provided in an embodiment of the present application;

[0032] Figure 11 A schematic diagram of an operating curve with a rotation angle range of 680 to 1170 provided in an embodiment of the present application;

[0033] Figure 12 A schematic diagram of an operating curve with a rotation angle range of 1170 to 2200 provided in an embodiment of the present application;

[0034] Figure 13A schematic diagram of an operating curve with a rotation angle range of 2200 to 3500 provided in an embodiment of the present application;

[0035] Figure 14 A schematic diagram of an operating curve with a rotation angle range of 3500 to 4250 provided in an embodiment of the present application;

[0036] Figure 15 A schematic diagram of an operating curve with a rotation angle range of 4250 to 5200 provided in an embodiment of the present application;

[0037] Figure 16 A schematic diagram of an operation curve with a rotation angle range of 5200 to 7400 provided in an embodiment of the present application;

[0038] Figure 17 A schematic diagram of an operating curve with a rotation angle range of 7400 to 9600 provided in an embodiment of the present application;

[0039] Figure 18 A schematic diagram of an operating curve with a rotation angle range of 9600 to 11400 provided in an embodiment of the present application;

[0040] Figure 19 A schematic diagram of an operation curve with a rotation angle range of 11400 to 1400 provided in an embodiment of the present application;

[0041] Figure 20 A schematic flow chart of a control method for shutting down a laser motor provided in an embodiment of the present application;

[0042] Figure 21 A flow chart of another method for adjusting the motor speed by a control module provided in an embodiment of the present application;

[0043] Figure 22 A schematic flow chart of a control method for starting a laser motor according to an embodiment of the present application;

[0044] Figure 23 A flowchart of a method for controlling a projection screen provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0046] It should be noted that the brief descriptions of terms in this application are only for the purpose of facilitating the understanding of the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and usual meanings.

[0047] In addition, the terms "comprises" and "comprising" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0048] Large-sized laser TV screens can be difficult to install in homes, and they take up a lot of wall space when hung on the wall. Currently, laser TV projection screens can be raised when the laser TV is turned on, and lowered when the laser TV is turned off, effectively reducing the space occupied by the laser TV when not in use.

[0049] Figure 1 This is a schematic diagram of an existing laser TV provided in an embodiment of the present application. Figure 1 As shown, the laser TV may include a projection screen and a laser projection device. The projection screen is a liftable screen, and the projection screen end includes a lifting module, which may include a controller, a motor and a coil spring.

[0050] based on Figure 1 The structure of the laser TV shown in the figure is that when the laser TV is turned on, the laser projection device can send a signal to the controller at the projection screen end. The controller receives the signal and can control the motor to drive the screen to rise through the winding spring until the projection screen is fully unfolded.

[0051] When the laser TV is turned off, the laser projection device can send a signal to the controller at the projection screen end. The controller receives the signal and controls the motor to drive the projection screen down through the coil spring until the projection screen drops to the bottom.

[0052] However, the coil spring force used in the aforementioned screen raising and lowering control process is uncontrollable, which may cause the projection screen to vibrate or wrinkle during the raising and lowering process. Furthermore, the coil spring force weakens over time, and the screen may not be tightened when it reaches the top, affecting the display quality of the projected image.

[0053] Based on this, an embodiment of the present application provides a laser TV. The liftable screen of the laser TV is equipped with two motors: a lifting motor for controlling the lifting of the screen, and a retracting motor for controlling the extension and retraction of the screen. During the process of controlling the lifting of the screen, the speeds of the lifting motor and the retracting motor are adjusted simultaneously by the operating parameters of the lifting motor, so that the lifting motor and the retracting motor can maintain synchronization, so that the screen displacement caused by the lifting motor and the retracting motor are the same, which can reduce the occurrence of jitter or wrinkles during the lifting and lowering of the screen. This can improve the image display quality of the laser TV.

[0054] Before describing the laser TV provided in the embodiment of the present application, first, the usage scenarios of the laser TV provided in the embodiment of the present application are described.

[0055] Figure 2 This is a schematic diagram of an operation scenario between a laser TV and a control device provided in an embodiment of the present application. Figure 2 As shown, the user can operate the laser TV 200 through the smart device 300 or the control device 100.

[0056] In some embodiments, the control device 100 may be a remote control. Communication between the remote control and the laser TV may include infrared protocol communication, Bluetooth protocol communication, or other short-range communication methods, controlling the laser TV 200 wirelessly or wiredly. The user may control the laser TV 200 by inputting user commands through buttons on the remote control, voice input, control panel input, etc. This embodiment of the present application does not specifically limit this.

[0057] In some embodiments, a smart device 300 (such as a mobile terminal, tablet computer, computer, laptop computer, etc.) can also be used to control the laser TV 200. For example, the laser TV 200 is controlled using an application running on the smart device.

[0058] In some embodiments, the laser TV may not use the above-mentioned smart device or control device to receive instructions, but may receive user control through touch or gestures.

[0059] In some embodiments, the laser TV 200 can also be controlled in ways other than the control device 100 and the smart device 300. For example, the user's voice command control can be directly received through a module for obtaining voice commands configured inside the laser TV 200 device, or the user's voice command control can be received through a voice control device set outside the laser TV 200 device.

[0060] In some embodiments, the laser TV 200 also communicates data with the server 400. This allows the laser TV 200 to communicate via a local area network (LAN), a wireless local area network (WLAN), and other networks. The server 400 can provide various content and interactions to the laser TV 200. The server 400 can be a single cluster or multiple clusters, and can include one or more types of servers.

[0061] Figure 3 A schematic diagram of a laser television provided in an embodiment of the present application.

[0062] like Figure 3 As shown, the laser TV provided in the embodiment of the present application may include a laser projection device and a liftable screen. The liftable screen includes a projection screen, a control module, a first motor for driving the projection screen to rise and fall, and a second motor for driving the projection screen to retract and extend.

[0063] In the embodiment of the present application, the liftable screen is a rollable screen, and the embodiment of the present application does not limit the material of the liftable screen.

[0064] The first motor is used to drive the projection screen to rise and fall. Figure 3 The motor of the X-shaped lifting mechanism drives the projection screen to move up and down by controlling the lifting of the lifting mechanism. The first motor can be a stepper motor or a servo motor. The embodiment of the present application does not specifically limit the type of the first motor.

[0065] The second motor is used to roll up and unfold the projection screen. Figure 3 The motor that rotates the roller mechanism in the projection screen reels in and out by controlling the rotation of the roller mechanism. The second motor can be a brushed DC motor, a servo motor, a stepper motor, etc. The embodiment of the present application does not specifically limit the type of the second motor.

[0066] The laser projection device can be used to send a control signal to the control module for controlling the screen to be raised or lowered when receiving a preset signal. During the movement of the projection screen, the laser projection device can also be used to project an image that matches the height information sent by the control module onto the projection screen.

[0067] For example, the preset signal can be a power-on signal or a power-off signal, and the power-on signal and the power-off signal can be based on Figure 2 The signals input by the user through the smart device 300 or the control apparatus 100 shown in the figure, and the manner in which the user inputs the power-on signal and the power-off signal through the smart device 300 or the control apparatus 100 can be referred to the above embodiment, and will not be repeated here.

[0068] The control module can be used to drive the projection screen to move by controlling the operation of the first motor and the second motor according to the control signal sent by the laser projection device.

[0069] For example, the projection screen movement may be moving the projection screen upward or downward. When the preset signal is a power-on signal, the control module may control the first motor and the second motor to operate, thereby driving the projection screen upward. When the preset signal is a power-off signal, the control module may control the first motor and the second motor to operate, thereby driving the projection screen downward.

[0070] During the movement of the projection screen, the control module can also be used to determine the first operating parameter of the first motor, adjust the speed of the first motor according to the first operating parameter and the speed signal corresponding to the first operating parameter, and adjust the speed of the second motor according to the adjusted speed of the first motor.

[0071] The first operating parameter may be the rotation angle of the first motor, or other parameters, which is not limited in the embodiment of the present application.

[0072] During the movement of the projection screen, the control module may also be used to determine the height information of the projection screen according to the operating parameters of the first motor, and send the height information to the laser projection device.

[0073] For example, when the laser projection device receives a preset signal, the laser projection device can send a control signal for controlling the screen to be raised or lowered to the control module. The control module controls the first motor and the second motor to drive the projection screen to move according to the received control signal.

[0074] During the movement of the projection screen, the control module can determine the operating parameters of the first motor, adjust the speed of the first motor according to the operating parameters and the speed signal corresponding to the operating parameters, and adjust the speed of the second motor according to the adjusted speed of the first motor.

[0075] During the movement of the projection screen, the control module can also determine the height information of the projection screen according to the operating parameters of the first motor and send the height information to the laser projection device. The laser projection device can project an image matching the height information onto the projection screen according to the height information.

[0076] The height information may be information used to indicate the current height of the projection screen. The embodiment of the present application does not specifically limit the height information.

[0077] For example, when the control module determines that the current height of the projection screen is 30 centimeters, the laser projection device can project an image with a height of 30 centimeters onto the projection screen.

[0078] In this way, when the projection screen is raised or lowered, the control module uses the operating parameters of the first motor to simultaneously control the speeds of the first and second motors, ensuring that the first and second motors work in sync. This means that the screen displacement caused by the lifting motor is the same as the screen displacement caused by the retracting motor. This can reduce jitter or wrinkles during the screen raising and lowering process, improving the display quality of the laser TV.

[0079] Figure 4 A schematic diagram of another laser TV provided in an embodiment of the present application.

[0080] like Figure 4 As shown, laser TV includes the above Figure 3 In addition to the components shown, the liftable projection screen may also include an encoder, a limit switch, a holding brake, and a wireless transmission device.

[0081] The lifting encoder can be used to obtain the angular displacement of the first motor and convert the angular displacement into a pulse signal. The encoder can be an incremental magnetic encoder or other types of encoders, which are not limited in the present embodiment.

[0082] The limit switch can be used to measure the zero point (i.e., the lowest point) of the curling and lifting screen. When the power is turned off abnormally, the screen can return to the zero point when it is powered on again. The limit switch can be an optical coupler limit switch or other type of limit switch, which is not limited in the embodiments of the present application.

[0083] The holding brake can be installed on the shaft of the lifting mechanism to protect the system from abnormal power failure. The holding brake releases the shaft when the power is on and locks the shaft when the power is off.

[0084] The wireless transmission device may be a Bluetooth dongle device, or a device that complies with Zigbee or other private protocols. The embodiments of the present application do not specifically limit the wireless transmission device.

[0085] like Figure 4 As shown, the laser projection device also includes an external communication interface, which is used to insert a wireless transmission device, and the laser projection device is connected to the liftable screen through the wireless transmission device.

[0086] The external communication interface of the laser projection device can be an interface that can be plugged in and out of a wireless transmission device at will, for example, it can be a USB interface. The embodiment of the present application does not specifically limit the external communication interface.

[0087] based on Figure 4 As shown, when the laser projection device receives a preset signal, the laser projection device can send a control signal for controlling the screen to be raised or lowered to the control module through a wireless transmission device;

[0088] During the movement of the projection screen, the control module can send height information to the laser projection device through a wireless transmission device.

[0089] Since the signal transmission method in the prior art is through the built-in wireless module of the laser projection device, it is necessary to wait until the laser projection device is fully started, that is, after a certain period of time (for example, 21 seconds) before sending a signal to the control module. Compared with the prior art, through an external wireless transmission device, the laser projection device can send a signal to the control module through the wireless transmission module when it receives the power-on signal, so that after the user inputs the power on and off command, the projection screen can respond quickly, thereby improving the user experience.

[0090] Furthermore, compared with adding a wireless module inside the laser projection device for signal transmission with the liftable projection screen, the external wireless transmission device does not require changes to the structure and internal components of the laser projection device, and when replacing the liftable projection screen, it is only necessary to insert the wireless transmission device of the new liftable projection screen into the interface of the laser projection device.

[0091] Based on the above embodiment, the internal structure of the laser TV can be seen in Figure 5 shown. Figure 5 A schematic diagram of the internal structure of a laser TV provided in an embodiment of the present application.

[0092] like Figure 5 As shown, the entire control system of the laser TV may include a laser projection device, a power adapter, a power module, a wireless module, a control module, a first motor, a first motor drive, a second motor, a second motor drive, an encoder, a brake, and a limit switch.

[0093] Among them, the power module, the control module, the first motor drive, the second motor drive, and the wireless module can be set on the control panel of the laser lifting screen.

[0094] The power adapter is used to supply power to the control board, the first motor and the second motor through the power module. For example, the power adapter can convert AC 220V into DC 24V output to supply power to the control board.

[0095] The control module may be a single chip microcomputer, and the embodiments of the present application do not specifically limit the control module.

[0096] The first motor driver is used to drive the first motor to work and adjust the speed of the first motor under the control of the control module.

[0097] The second motor driver is used to drive the second motor to work and adjust the speed of the second motor under the control of the control module.

[0098] Below, in combination with the contents described in the above embodiments, the following description will be given in detail of the situation where the projection screen descends when the laser TV is turned off and the situation where the projection screen rises when the laser TV is turned on.

[0099] Regarding the situation where the projection screen drops when the laser TV is turned off, please refer to the following embodiments:

[0100] When the user passes the above Figure 2 When the smart device 300 or the control apparatus 100 shown inputs a shutdown signal, the laser projection device may receive the shutdown signal, and the laser projection device sends a first control signal for controlling the screen to descend to the control module via a wireless transmission device.

[0101] When the control module receives the first control signal sent by the laser projection device, it can control the first motor to rotate in the first rotation direction according to the first control signal, driving the projection screen to descend, and control the second motor to rotate in the second rotation direction, driving the projection screen to retract.

[0102] For example, when the first motor rotates forward, it can drive the projection screen to descend. Therefore, controlling the first motor to rotate in a first rotation direction can be referred to as controlling the first motor to rotate forward. When the second motor rotates reversely, it can drive the projection screen to retract. Therefore, controlling the second motor to rotate in a second rotation direction can be referred to as controlling the second motor to rotate reversely.

[0103] In this way, the projection screen is driven to descend by the first motor, and is driven to roll up by the second motor, so that the projection screen is rolled up during the process of descending, which can reduce the shaking or wrinkling of the projection screen during the process of descending and improve the user experience.

[0104] For example, when the control module controls the projection screen to descend, the first angular displacement of the first motor can be acquired through an encoder, converted into a first pulse signal, and sent to the control module. After receiving the first pulse signal, the control module adjusts the rotational speeds of the first motor and the second motor.

[0105] In this way, the angular displacement of the first motor is collected by the encoder, and the pulse signal corresponding to the angular displacement is sent to the control module, so that the accuracy of the signal related to the operating parameters of the first motor obtained by the control module is higher, which can improve the accuracy of the control module in controlling the motor speed.

[0106] During the process of the projection screen descending, the control module adjusts the speed of the motor. Figure 6 As shown, Figure 6 A flow chart of a method for adjusting the motor speed by a control module provided in an embodiment of the present application.

[0107] like Figure 6 As shown, the method for the control module to adjust the motor speed may include the following steps:

[0108] S601 : Determine a first rotation angle of a first motor according to a first pulse signal.

[0109] Exemplarily, the control module may store a correspondence between the pulse signal and the rotation angle of the motor, so that the control module may determine the first rotation angle of the first motor corresponding to the first pulse signal based on the correspondence.

[0110] S602: Determine, according to the first rotation angle, a first operating curve corresponding to the first rotation angle from a plurality of pre-stored operating curves.

[0111] The first operating curve is a curve of the rotation angle and the rotation speed signal corresponding to the rotation angle range in which the first rotation angle is located.

[0112] For example, the multiple pre-stored operating curves can be obtained in advance based on the operating parameters of the first motor and the rising condition of the projection screen, can be obtained through simulation methods, or can be obtained through repeated experiments, and the embodiments of the present application do not limit this.

[0113] Below, a method of obtaining multiple operating curves of the first motor is described by way of example.

[0114] Figure 7 A schematic structural diagram of a first motor provided in an embodiment of the present application.

[0115] like Figure 7 As shown, when the first motor is working to drive the projection screen to move up and down, the connecting rod can be controlled to move horizontally to drive the projection screen to move up and down.

[0116] The relationship between the translation speed of the connecting rod of the first motor and time can satisfy the following formula:

[0117]

[0118] In the above formula, A is the translation speed of the connecting rod of the first motor, V is half of the rising speed of the projection screen, L is the length of the connecting rod of the first motor, and H is the initial height of the connecting rod of the first motor.

[0119] The connecting rod length L of the first motor and the initial height H of the connecting rod of the first motor are known.

[0120] Furthermore, the time t may be discretely quantized, and the relationship among the time t, the pulse width modulation (PWM) frequency, the translation speed A of the connecting rod of the first motor, and the rotation angle of the first motor may be calculated at time intervals of 100 ms.

[0121] It should be noted that when the control module controls the speed of the first motor, it outputs a PWM signal to the first motor driver, causing the first motor driver to control the speed of the first motor according to the PWM frequency corresponding to the PWM signal. Of course, the control module can also control the speed of the first motor using other forms of digital signals. This embodiment of the present application only uses PWM signals as an example for illustration and does not constitute any limitation.

[0122] For example, if the connecting rod length L of the first motor is 700 mm, the initial height H of the connecting rod of the first motor is 78 mm, and the horizontal displacement per revolution of the first motor is 10 mm, the PWM frequency per 100 ms can be determined to be A / 10*R*P, where R is the reduction ratio of the first motor and P is the number of pulses required by the control module per revolution of the first motor. For example, R is 2.5 and P is 4096. Based on the above example data, the relationship between time t, PWM frequency, translational velocity A of the connecting rod of the first motor, and the rotation angle of the first motor can be seen in Table 1 below.

[0123] Table 1

[0124]

[0125]

[0126] Furthermore, by performing data fitting on the PWM frequency and the rotation angle of the first motor in Table 1 above, fitting curves for different rotation angle intervals can be obtained, that is, multiple operating curves can be obtained, and the formulas corresponding to the multiple operating curves are stored in the control module, so that the control module can determine the corresponding operating curve according to the determined rotation angle when controlling the screen to descend. The operating curve obtained based on the data in Table 1 above can be found in Figures 8-19 shown.

[0127] It should be noted that in Figures 8-19 In the running curve shown, the horizontal axis is x and the vertical axis is y.

[0128] Figure 8 A schematic diagram of an operating curve with a rotation angle range of 0 to 138 provided in an embodiment of the present application.

[0129] like Figure 8 As shown, the running curve of the rotation angle range of 0 to 160 satisfies y = 3.5389x + 1725.2, R2 =0.9987. Where y is the PWM frequency and x is the rotation angle.

[0130] Figure 9 This is a schematic diagram of an operating curve with a rotation angle range of 138 to 350 degrees provided in an embodiment of the present application.

[0131] like Figure 9 As shown, the operating curve of the rotation angle range of 138 to 350 satisfies y = 4.7466x + 1557.6, R 2 =0.9981. Where y is the PWM frequency and x is the rotation angle.

[0132] Figure 10 A schematic diagram of an operating curve with a rotation angle range of 350 to 680 provided in an embodiment of the present application.

[0133] like Figure 10 As shown, the operating curve of the rotation angle range of 350 to 680 satisfies y = 2.7551x + 1999, R 2 =0.999. Where y is the PWM frequency and x is the rotation angle.

[0134] Figure 11 A schematic diagram of an operating curve with a rotation angle range of 680 to 1170 provided in an embodiment of the present application.

[0135] like Figure 11 As shown, the running curve of the rotation angle range of 680 to 1170 satisfies y = 2.2271x + 2352.8, R 2 =0.9993. Where y is the PWM frequency and x is the rotation angle.

[0136] Figure 12 A schematic diagram of an operating curve with a rotation angle range of 1170 to 2200 provided in an embodiment of the present application.

[0137] like Figure 12 As shown, the operating curve of the rotation angle range of 1170 to 2200 satisfies y = 1.7988x + 2853.7, R 2 =0.9992. Where y is the PWM frequency and x is the rotation angle.

[0138] Figure 13 A schematic diagram of an operating curve with a rotation angle range of 2200 to 3500 provided in an embodiment of the present application.

[0139] like Figure 13 As shown, the operating curve of the rotation angle range of 2200~3500 satisfies y=1.5068x+3466.4, R 2=0.9997. Where y is the PWM frequency and x is the rotation angle.

[0140] Figure 14 A schematic diagram of an operating curve with a rotation angle range of 3500 to 4250 provided in an embodiment of the present application.

[0141] like Figure 14 As shown, the operating curve of the rotation angle range of 3500 to 4250 satisfies y = 1.3883x + 3861.2, R 2 = 1. Where y is the PWM frequency and x is the rotation angle.

[0142] Figure 15 A schematic diagram of an operating curve with a rotation angle range of 4250 to 5200 provided in an embodiment of the present application.

[0143] like Figure 15 As shown, the operating curve of the rotation angle range of 4250 to 5200 satisfies y = 1.344x + 4050, R 2 = 1. Where y is the PWM frequency and x is the rotation angle.

[0144] Figure 16 A schematic diagram of an operating curve with a rotation angle range of 5200 to 7400 provided in an embodiment of the present application.

[0145] like Figure 16 As shown, the operating curve of the rotation angle range of 5200~7400 satisfies y=1.3221x+4162.2, R 2 = 1. Where y is the PWM frequency and x is the rotation angle.

[0146] Figure 17 A schematic diagram of an operating curve with a rotation angle range of 7400 to 9600 provided in an embodiment of the present application.

[0147] like Figure 17 As shown, the operating curve of the rotation angle range of 7400~9600 satisfies y=1.3689x+3803.9, R 2 =0.9999. Where y is the PWM frequency and x is the rotation angle.

[0148] Figure 18 A schematic diagram of an operating curve with a rotation angle range of 9600 to 11400 provided in an embodiment of the present application.

[0149] like Figure 18 As shown, the operating curve of the rotation angle range of 9600~11400 satisfies y=1.4766x+2768.6, R 2=0.9999. Where y is the PWM frequency and x is the rotation angle.

[0150] Figure 19 A schematic diagram of an operating curve with a rotation angle range of 11400 to 1400 provided in an embodiment of the present application.

[0151] like Figure 19 As shown, the operating curve for the rotation angle range of 11400 to 1400 satisfies y = 1.6577x + 668.32, R2 = 0.9996, where y is the PWM frequency and x is the rotation angle.

[0152] S603 : Determine a first speed signal corresponding to a first rotation angle in a first operating curve.

[0153] The first speed signal may be a PWM signal, or other signals, which is not limited in the embodiment of the present application.

[0154] As described in the above steps, the PWM frequency corresponding to the first rotation angle can be determined in the first operating curve, and the rotation speed of the first motor can be controlled using the PWM frequency.

[0155] S604: Determine a second speed signal of the second motor corresponding to the first rotation angle.

[0156] In the embodiment of the present application, the control module may also pre-store a correspondence between the rotation angle of the first motor and the speed signal of the second motor. The control module may determine the second speed signal of the second motor corresponding to the first rotation angle in the correspondence based on the first rotation angle.

[0157] Exemplarily, the second speed signal is a PWM signal, but may also be other signals, which is not limited in the present embodiment. Taking the second speed signal as a PWM signal as an example, the corresponding relationship between the rotation angle of the first motor and the speed signal of the second motor stored in the control module may be the corresponding relationship between the rotation angle of the first motor and the PWM frequency of the second motor.

[0158] Taking the data described in the above steps as an example, the corresponding relationship can be shown in Table 2 below.

[0159] Table 2

[0160] Rotation angle of the first motor PWM frequency of the second motor Hz 5.49～131 1000 138.8～2095.8 2500 2119～3463 2600 3494～4241 2700 4275.9～5153.4 2750 5192～9541 2800 9601～11401 2850 11470～13829 2800

[0161] As shown in Table 2, the control module can determine the PWM frequency of the second motor corresponding to the first rotation angle according to the range of the first rotation angle of the first motor.

[0162] S605 : Using the first speed signal, adjust the speed of the first motor to a first speed corresponding to the first speed signal, and using the second speed signal, adjust the speed of the second motor to a second speed corresponding to the second speed signal.

[0163] Based on the above steps, the control module uses the first speed signal to adjust the speed of the first motor to the first speed corresponding to the first speed signal, which may include: the control module sends a PWM signal to the first motor driver, and the first motor driver adjusts the speed of the first motor to the first speed according to the PWM frequency corresponding to the PWM signal, and the first speed is the speed corresponding to the PWM frequency.

[0164] The control module uses the second speed signal to adjust the speed of the second motor to the second speed corresponding to the second speed signal, which may include: the control module sends a PWM signal to the second motor driver, and the second motor driver adjusts the speed of the second motor to the second speed according to the PWM frequency corresponding to the PWM signal, and the second speed is the speed corresponding to the PWM frequency.

[0165] In this way, the control module adjusts the speed of the first motor and the speed of the second motor simultaneously based on the operating parameters of the first motor, so that the first and second motors can be synchronized. That is, the displacement of the projection screen when it is lowered by the first motor is the same as the displacement of the projection screen when it is retracted by the second motor. This can reduce shaking or wrinkling of the screen during the lowering process, and improve the image display quality of the laser TV during the lowering process of the projection screen.

[0166] In an embodiment of the present application, during the descent of the projection screen, the control module may further determine first height information of the projection screen according to the first rotation angle, and send the first height information to the laser projection device.

[0167] For example, as the projection screen descends, the control module can send height information to the laser projection device in real time, or at preset intervals. This allows the laser projection device to adjust the height of the projected image based on the received height information, projecting an image at the corresponding height onto the projection screen. Furthermore, the projected image disappears as the projection screen descends, creating a "follow-up" effect and enhancing the user experience.

[0168] In an embodiment of the present application, during the descent of the projection screen, the limit switch can detect whether the projection screen has descended to the lowest point allowed for the projection screen to descend. When it is detected that the projection screen has descended to the lowest point allowed for the projection screen to descend, the limit switch sends a first signal to the control module.

[0169] When the control module receives the first signal sent by the limit switch, it can control the first motor and the second motor to stop rotating according to the first signal and send a second signal to the laser projection device. When the laser projection device receives the second signal sent by the control module, it can stop projecting the image onto the projection screen according to the second signal.

[0170] In this way, when the projection screen drops to the lowest point, the motor can be controlled to stop rotating, and the laser projection device stops projecting images, which can improve the user experience.

[0171] Below, taking the first motor as the lifting motor and the second motor as the retracting and discharging motor as an example, the control method of the laser TV when the laser TV is turned off is described in detail. Figure 20 As shown, Figure 20 A flowchart of a control method for shutting down a laser motor provided in an embodiment of the present application.

[0172] like Figure 20 As shown, the control method for turning off the laser TV may include the following steps:

[0173] Step 1: The laser projection device receives a shutdown command input by the user using a remote control.

[0174] Step 2: The laser projection device transmits a shutdown signal to the liftable screen via a wireless transmission device.

[0175] Step 3: The control module of the liftable screen drives the lift motor to rotate forward and drives the retractable motor to rotate reversely, so that the projection screen descends at a uniform speed.

[0176] Step 4: The encoder converts the angular displacement of the lifting motor into a pulse signal and sends it to the control module.

[0177] Step 5. The control module converts the pulse signal provided by the encoder into the rotation angle of the lifting motor. The control module adjusts the first drive PWM frequency of the lifting motor at the corresponding rotation angle according to the pre-stored lifting motor angle frequency curve; at the same time, the control module adjusts the second drive PWM frequency of the transmitting and receiving motor corresponding to the corresponding rotation angle of the lifting motor according to the pre-stored angle frequency segmentation data of the transmitting and receiving motor.

[0178] The angle frequency curve of the lifting motor is the operating curve described in the embodiment of this application, which can be referred to in the above embodiment and will not be repeated here. The angle frequency segmentation data of the reciprocating motor can be referred to in Table 2 above and will not be repeated here.

[0179] Step 6: Use the first driving PWM frequency to adjust the speed of the lifting motor, and use the first driving PWM frequency to adjust the speed of the transmitting and receiving motor.

[0180] Step 7: The wireless module of the liftable projection screen transmits screen height information to the laser projection device.

[0181] Step 8: After receiving the screen height information, the laser projection device starts to project an image that matches the screen height.

[0182] Step 9: The wireless module of the liftable projection screen transmits screen height information to the laser TV host every 10ms.

[0183] The embodiment of the present application is only described by taking the example of transmitting the screen height information to the laser TV host every 10ms, which does not constitute any limitation. The screen height information can also be transmitted to the laser TV host in real time.

[0184] Step 10: The laser TV adjusts the height of the projected image after receiving the screen height information every 10ms.

[0185] Step 11: After the control module detects through the limit switch that the screen has dropped to the bottom, the laser projection device stops projecting the image, the lifting motor and the retracting / discharging motor stop rotating, and the control module cuts off the power to the lifting motor and the retracting / discharging motor.

[0186] The above embodiment describes the case where the projection screen descends when the laser TV is turned on. Next, for the case where the projection screen rises when the laser TV is turned on, please refer to the following embodiment:

[0187] When the user passes the above Figure 2 When the smart device 300 or the control apparatus 100 shown inputs a power-on signal, the laser projection device can receive the power-on signal, and the laser projection device sends a second control signal for controlling the screen to rise to the control module via a wireless transmission device.

[0188] The control module is specifically configured to, upon receiving a second control signal and after a first preset duration, control the first motor to rotate in a third rotational direction and energize the second motor in an enabled state in accordance with the second control signal, thereby driving the projection screen upward. The third rotational direction is opposite to the first rotational direction, and the difference between the first preset duration and the first duration is less than a preset value. The first duration is the interval between the moment the laser projection device receives the power-on signal and the moment it is able to project an image onto the projection screen.

[0189] The first preset value can be a relatively small value, for example, 0. The present embodiment does not limit the first preset value. Thus, when the laser projection device is able to project an image onto the projection screen, the projection screen is then driven to rise, thereby reducing the possibility of the projection screen not displaying an image when the projection screen first begins to rise, thereby improving the user experience.

[0190] As in the above embodiment, when the first motor rotates forward, it can drive the projection screen to descend. Therefore, controlling the first motor to rotate in the third rotation direction can be controlling the first motor to rotate in the reverse direction.

[0191] It is understandable that if the second motor is controlled to unfold the projection screen, the displacement of the unfolded projection screen may be greater than the displacement of the screen during its ascent, causing the screen to shake or wrinkle during the ascent. However, the present application energizes the second motor and enables it to drive the second motor to rotate and release the projection screen. Compared to controlling the second motor to unfold the projection screen, this can reduce screen shaking or wrinkling during the ascent of the projection screen, thereby improving the user experience.

[0192] Furthermore, while the control module is controlling the projection screen to descend, the encoder can be used to obtain a second angular displacement of the first motor, convert the second angular displacement into a second pulse signal, and transmit the second pulse signal to the control module. Upon receiving the second pulse signal, the control module adjusts the rotational speeds of the first motor and the second motor.

[0193] During the projection screen's rise, the control module adjusts the motor's speed. Figure 21 As shown, Figure 21 A flowchart of another method for adjusting the motor speed by a control module provided in an embodiment of the present application.

[0194] like Figure 21 As shown, the method for the control module to adjust the motor speed may include the following steps:

[0195] S2101. Determine a second rotation angle of the first motor according to the second pulse signal.

[0196] S2102: Determine a second operation curve corresponding to the second rotation angle from a plurality of pre-stored operation curves.

[0197] The second operating curve is a curve of the angle and the rotation speed signal corresponding to the rotation angle range in which the second rotation angle is located.

[0198] The multiple pre-stored operating curves and the method for determining the second operating curve are similar to the method for determining the first operating curve described in the above embodiment, and are not described in detail here.

[0199] S2103 : Determine a third speed signal corresponding to the second rotation angle in the second operating curve.

[0200] The third speed signal may be a PWM signal, or other signals, which is not limited in the embodiment of the present application.

[0201] As described in the above steps, the PWM frequency corresponding to the second rotation angle can be determined in the second operating curve, and the rotation speed of the first motor can be controlled using the PWM frequency.

[0202] S2104: Use the third speed signal to adjust the speed of the first motor to a third speed corresponding to the third speed signal.

[0203] Based on the above steps, the control module uses the third speed signal to adjust the speed of the first motor to the third speed corresponding to the third speed signal, which may include: the control module sends a PWM signal to the first motor driver, and the first motor driver adjusts the speed of the first motor to the third speed according to the PWM frequency corresponding to the PWM signal, and the third speed is the speed corresponding to the PWM frequency.

[0204] In this way, the control module adjusts the speed of the first motor based on its operating parameters. Since the speed of the second motor is 0, there is no need to adjust the speed of the second motor. This allows the first motor to drive the projection screen to rise at a constant speed, reducing jitter or wrinkles during the screen's ascent. This can improve the image quality of the laser TV during the projection screen's ascent.

[0205] In an embodiment of the present application, during the rising process of the projection screen, the control module can also determine the second height information of the projection screen according to the second rotation angle, and send the second height information to the laser projection device.

[0206] In a possible implementation, when the control module determines the height information of the projection screen according to the rotation angle of the first motor, the height information is sent to the laser projection device after a second preset time period.

[0207] The second preset duration can be determined based on the time interval between the moment the projection screen starts to rise and the moment the laser projection device can receive the information sent by the control module. The embodiment of the present application does not limit the second preset duration.

[0208] For example, the laser projection device can be turned on 21 seconds after receiving the power-on signal, and can project an image onto the projection screen 12 seconds after receiving the power-on signal. Therefore, the control module can send height information to the laser projection device 9 seconds after the projection screen rises.

[0209] It should be noted that during the projection screen's ascent, after the control module initially sends height information to the laser projector, the laser projector can receive this information at any time. Therefore, the control module can send this information to the laser projector in real time or at preset intervals. This allows the laser projector to adjust the height of the projected image based on the received height information to project an image at the corresponding height onto the projection screen. Furthermore, the projected image rises as the projection screen ascends, creating a "picture-following" effect and enhancing the user experience.

[0210] Below, taking the first motor as the lifting motor and the second motor as the retracting and discharging motor as an example, the control method of the laser TV when the laser TV is turned on is described in detail. Figure 22 As shown, Figure 22 A flow chart of a control method for starting a laser motor provided in an embodiment of the present application.

[0211] like Figure 22 As shown, the control method for turning on the laser TV may include the following steps:

[0212] Step 1: The laser projection device receives a power-on command input by the user using a remote control.

[0213] Step 2: The laser projection device transmits a power-on signal to the liftable screen via a wireless transmission device.

[0214] Step 3: After the control module of the liftable screen receives the power-on signal for 12 seconds, the control module drives the lift motor to reverse, and the retractable motor is only powered on but not enabled.

[0215] It should be noted that 12S is the first preset duration described in the above embodiment. The embodiment of the present application only uses the first preset duration of 12S as an example for illustration and does not constitute any limitation.

[0216] In this way, the projection screen can be pulled up by the lifting motor, and the projection screen can be raised at a uniform speed.

[0217] Step 4: The encoder converts the angular displacement of the lifting motor into a pulse signal and sends it to the control module.

[0218] Step 5: The control module converts the pulse signal provided by the encoder into the rotation angle of the lifting motor. The control module adjusts the third driving PWM frequency of the lifting motor at the corresponding rotation angle according to the pre-stored lifting motor angle frequency curve.

[0219] The angle frequency curve of the lifting motor is the operating curve described in the embodiment of the present application. Please refer to the above embodiment and will not be repeated here.

[0220] Step 6: After the projection screen rises for 9 seconds, the wireless module of the projection screen can transmit the screen height information to the laser projection device.

[0221] It should be noted that 12S is the second preset time length described in the above embodiment. The embodiment of the present application only uses the second preset time length of 9S as an example for illustration and does not constitute any limitation.

[0222] Step 7: After receiving the screen height information, the laser projection device starts to project an image that matches the screen height.

[0223] Step 8: The wireless module of the liftable projection screen transmits screen height information to the laser projection device host every 10ms.

[0224] The embodiment of the present application is only described by taking the example of transmitting the screen height information to the laser TV host every 10ms, which does not constitute any limitation. The screen height information can also be transmitted to the laser TV host in real time.

[0225] Step 9: The laser projection device adjusts the height of the projected image after receiving the screen height information every 10ms.

[0226] Step 10: The projection screen rises to the top, the image projected by the laser projection device reaches the maximum size, the lifting motor and the receiving and discharging motor stop rotating, and the control module cuts off the power to the lifting motor and the receiving and discharging motor.

[0227] To sum up, the embodiment of the present application is a scoring laser TV, which realizes that the lifting mechanism drives the screen to rise and fall stably and without shaking by adopting the synchronous movement of the lifting motor and the discharge and receiving motor. During the lifting process, the height information of the projection screen is transmitted between the laser projection device and the liftable screen by the wireless transmission device, thereby realizing picture following, that is, the picture rises and falls with the lifting of the projection screen.

[0228] Figure 23 This is a flow chart of a method for controlling a projection screen provided in an embodiment of the present application. The method for controlling a projection screen can be implemented by the laser TV described in the above embodiment. Figure 23 As shown, the control method of the projection screen may include:

[0229] S2301. When the laser projection device receives a preset signal, a control signal for controlling the lifting and lowering of the screen is sent to a control module through the laser projection device.

[0230] S2302: The control module controls the first motor and the second motor to operate according to the control signal, thereby driving the projection screen to move.

[0231] S2303. During the movement of the projection screen, the control module determines the operating parameters of the first motor, adjusts the speed of the first motor according to the operating parameters and the speed signal corresponding to the operating parameters, and adjusts the speed of the second motor according to the adjusted speed of the first motor.

[0232] S2304: During the movement of the projection screen, the control module determines the height information of the projection screen according to the operating parameters of the first motor, and sends the height information to the laser projection device.

[0233] S2305. During the movement of the projection screen, an image matching the height information is projected onto the projection screen by a laser projection device according to the height information.

[0234] The embodiment of the present application provides a method for controlling a projection screen, the implementation principle and technical effects of which are similar to those of the laser projection device described in the above embodiment, and will not be repeated here.

[0235] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used for the methods in the above embodiments.

[0236] The present application also provides a program product, the program product including execution instructions stored in a readable storage medium. At least one control module of a display device can read the execution instructions from the readable storage medium, and at least one control module executes the execution instructions to cause the display device to implement the projection screen control method provided by the various embodiments described above.

[0237] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0238] For ease of explanation, the above description has been made with reference to specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations are possible. The above embodiments are selected and described to better explain the principles and practical applications, so that those skilled in the art can better utilize the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A laser TV, characterized in that: The laser TV includes a laser projection device and a liftable projection screen, wherein the liftable projection screen includes a projection screen, a control module, a first motor for driving the projection screen to rise and fall, and a second motor for driving the projection screen to retract and extend; The laser projection device is configured to send a control signal for controlling the lifting and lowering of the screen to the control module when receiving a preset signal; The control module is configured to drive the projection screen to move by controlling the first motor and the second motor to operate according to the control signal; During the movement of the projection screen, the control module is configured to determine operating parameters of the first motor, adjust the speed of the first motor according to the operating parameters and a speed signal corresponding to the operating parameters, and adjust the speed of the second motor according to the adjusted speed of the first motor; During the movement of the projection screen, the control module is further configured to determine height information of the projection screen according to operating parameters of the first motor, and send the height information to the laser projection device; During the movement of the projection screen, the laser projection device is used to project an image matching the height information onto the projection screen according to the height information.

2. The laser TV according to claim 1, wherein: The liftable screen further includes a wireless transmission device, and the laser projection device further includes an external communication interface, wherein the external communication interface is used to insert the wireless transmission device, and the laser projection device is connected to the liftable screen via the wireless transmission device; The laser projection device is specifically configured to send a control signal for controlling the screen to be raised or lowered to the control module via the wireless transmission device when the preset signal is received; During the movement of the projection screen, the control module is specifically configured to send the height information to the laser projection device via the wireless transmission device.

3. The laser TV according to claim 2, characterized in that: The preset signal includes a shutdown signal, and the control signal includes a first control signal; The laser projection device is specifically configured to send the first control signal for controlling the screen to descend to the control module via the wireless transmission device when receiving the shutdown signal; The control module is specifically configured to control the first motor to rotate in a first rotation direction according to the first control signal to drive the projection screen to descend, and control the second motor to rotate in a second rotation direction to drive the projection screen to retract.

4. The laser TV according to claim 3, wherein: The liftable projection screen further includes an encoder, the operating parameter includes a first rotation angle, and the height information includes first height information of the projection screen during a descending process; During the descending process of the projection screen, the encoder is used to obtain a first angular displacement of the first motor, convert the first angular displacement into a first pulse signal, and send the first pulse signal to the control module; During the process of descending the projection screen, the control module is specifically configured to determine the first rotation angle of the first motor according to the first pulse signal, determine a first operating curve corresponding to the first rotation angle from a plurality of pre-stored operating curves, determine a first speed signal corresponding to the first rotation angle from the first operating curve, and determine a second speed signal of the second motor corresponding to the first rotation angle; adjust the speed of the first motor to a first speed corresponding to the first speed signal using the first speed signal, and adjust the speed of the second motor to a second speed corresponding to the second speed signal using the second speed signal; wherein the first operating curve is a curve of angles and speed signals corresponding to a rotation angle range within which the first rotation angle is located; During the process of the projection screen descending, the control module is further specifically configured to determine the first height information of the projection screen according to the first rotation angle, and send the first height information to the laser projection device.

5. The laser TV according to claim 3 or 4, characterized in that: The liftable screen also includes a limit switch; The limit switch is configured to send a first signal to the control module when detecting that the projection screen has descended to the lowest point allowed for the projection screen to descend; The control module is further configured to control the first motor and the second motor to stop rotating according to the first signal, and to send a second signal to the laser projection device; The laser projection device is further configured to stop projecting images onto the projection screen according to the second signal.

6. The laser TV according to claim 2, characterized in that: The preset signal includes a power-on signal, and the control signal includes a second control signal; The laser projection device is specifically configured to send the second control signal for controlling the screen to rise to the control module via the wireless transmission device when receiving the power-on signal; The control module is specifically configured to, upon receiving the second control signal, control the first motor to rotate in a third rotation direction and control the second motor to be powered on and in an enabled state according to the second control signal after a first preset time period, thereby driving the projection screen to rise; the third rotation direction is opposite to the first rotation direction, the difference between the first preset time period and the first time period is less than a preset value, and the first time period is the time interval between the moment the laser projection device receives the power-on signal and the moment when it can project an image onto the projection screen.

7. The laser TV according to claim 6, characterized in that: The liftable projection screen further includes an encoder, the operating parameter includes a second rotation angle, and the height information includes second height information of the projection screen during its ascent; During the ascending process of the projection screen, the encoder is used to obtain a second angular displacement of the first motor, convert the second angular displacement into a second pulse signal, and send the second pulse signal to the control module; During the raising process of the projection screen, the control module is specifically configured to determine the second rotation angle of the first motor according to the second pulse signal, determine a second operating curve corresponding to the second rotation angle from a plurality of pre-stored operating curves, determine a third speed signal corresponding to the second rotation angle from the second operating curve, and use the third speed signal to adjust the speed of the first motor to a third speed corresponding to the third speed signal; wherein the second operating curve is a curve of angles and speed signals corresponding to a rotation angle range within which the second rotation angle is located; During the rising process of the projection screen, the control module is further configured to determine the second height information of the projection screen according to the second rotation angle, and send the second height information to the laser projection device.

8. The laser TV according to claim 6 or 7, characterized in that: The control module is specifically configured to send the height information to the laser projection device after a second preset time period when the height information of the projection screen is determined according to the rotation angle of the first motor.

9. A method for controlling a projection screen, characterized in that: The laser TV according to any one of claims 1 to 8 comprises a laser projection device and a liftable projection screen, wherein the liftable projection screen comprises a projection screen, a control module, a first motor for lifting and lowering the projection screen, and a second motor for retracting and extending the projection screen. When the laser projection device receives a preset signal, a control signal for controlling the screen to be raised or lowered is sent to the control module via the laser projection device; The control module controls the first motor and the second motor to operate according to the control signal, thereby driving the projection screen to move; During the movement of the projection screen, the control module determines operating parameters of the first motor, adjusts the speed of the first motor according to the operating parameters and a speed signal corresponding to the operating parameters, and adjusts the speed of the second motor according to the adjusted speed of the first motor; During the movement of the projection screen, the control module determines the height information of the projection screen according to the operating parameters of the first motor, and sends the height information to the laser projection device; During the movement of the projection screen, the laser projection device projects an image matching the height information onto the projection screen according to the height information.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the method of claim 9 is implemented.

11. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to claim 9 when the computer program is executed by a processor.

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