Projection device and control method thereof

Abstract

The application discloses a projection device and a control method thereof, and belongs to the field of projection display. When it is determined that a mainboard is in a dead state and a display board is not in a dead state, the control circuit in the projection device can first control a light valve to reset, and then control a light valve power supply circuit to stop supplying power to the light valve. Moreover, when it is determined that the display board is in a dead state, the control circuit can control the light valve power supply circuit to stop supplying power to the light valve. Thus, the light valve in the projection device can be prevented from being damaged due to the fact that a user directly unplugs a power supply to restart the projection device.

Description

Technical Field

[0001] This disclosure relates to the field of projection display, and in particular to a projection device and its control method. Background Technology

[0002] The projection device may include a motherboard connected to a power board. The power board can supply power to the motherboard and other components in the projection device. In response to a power-off command, the motherboard can control the power board to stop supplying power to some components on the motherboard and other components in the projection device, thereby powering off the projection device. Subsequently, in response to a power-on command, the motherboard can control the power board to supply power to all components in the projection device, thereby restarting the projection device.

[0003] In related technologies, when the motherboard freezes, it cannot detect or respond to shutdown commands. In this case, the user can only unplug the power cord of the projector, plug it back in, and then restart the projector to restart the motherboard.

[0004] However, since other components in the projection device may still be working after the motherboard crashes, restarting the motherboard by unplugging the power may damage the light valve in the projection device. Summary of the Invention

[0005] This disclosure provides a projection device and its control method, which solves the problem in related technologies where users restarting the motherboard by unplugging the power supply may damage the light valve in the projection device. The technical solution is as follows:

[0006] On the one hand, a projection device is provided, the projection device including: a motherboard, a display board, a light valve, a light source, a projection lens, a control circuit, and a light valve power supply circuit connected to the light valve;

[0007] The motherboard is connected to the display panel, and the motherboard is used to send image signals to the display panel;

[0008] The display panel is also connected to the light valve. The display panel is used to generate a light valve control signal according to the image signal, and control the light valve to flip according to the light valve control signal so as to transmit the light beam emitted by the light source to the projection lens.

[0009] The projection lens is used to project the light beam into an image;

[0010] The control circuit is connected to the motherboard, the display panel, and the power supply circuit for the light valve, respectively, and the control circuit is used for:

[0011] If a forced shutdown operation is detected, then check whether the motherboard and the display board are in a frozen state.

[0012] If the motherboard is detected to be in a frozen state, but the display panel is not in a frozen state, the light valve is controlled to reset, and after the light valve is controlled to reset, the light valve power supply circuit is controlled to stop supplying power to the light valve.

[0013] If the display panel is detected to be in a frozen state, the power supply circuit of the light valve is controlled to stop supplying power to the light valve.

[0014] On the other hand, a projection device is provided, which includes: a motherboard, a display panel, a light valve, a light source, a projection lens, and a control circuit;

[0015] The motherboard is connected to the display panel, and the motherboard is used to send image signals to the display panel;

[0016] The display panel is also connected to the light valve. The display panel is used to generate a light valve control signal according to the image signal, and control the light valve to flip according to the light valve control signal so as to transmit the light beam emitted by the light source to the projection lens.

[0017] The projection lens is used to project the light beam into an image;

[0018] The control circuit is connected to the motherboard and the display panel respectively, and the control circuit is used for:

[0019] If a forced shutdown operation is detected, then check whether the motherboard and the display board are in a frozen state.

[0020] If the motherboard is detected to be in a frozen state while the display board is not frozen, the motherboard is restarted without adjusting the operating state of the display board.

[0021] On another front, a control method for a projection device is provided, applied in the projection device, which includes: a control circuit, a motherboard, a display panel, a light valve, and a light valve power supply circuit. The control circuit is connected to the motherboard, the display panel, and the light valve power supply circuit, respectively, and the light valve power supply circuit is also connected to the light valve. The method includes:

[0022] If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display panel respectively.

[0023] If the control circuit detects that it has not received a response signal from the motherboard within the first communication duration, but has received a response signal from the display panel within the second communication duration, it controls the light valve to reset, and after controlling the light valve to reset, it controls the light valve power supply circuit to stop supplying power to the light valve.

[0024] If the control circuit detects that it has not received a response signal from the display panel within the second communication period, it controls the light valve power supply circuit to stop supplying power to the light valve.

[0025] Furthermore, a control method for a projection device is provided, applied in the projection device, which includes: a control circuit, a motherboard, and a display board, wherein the control circuit is connected to the motherboard and the display board respectively; the method includes:

[0026] If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display panel respectively.

[0027] If the control circuit detects that it has not received a response signal from the motherboard within the first communication period, but has received a response signal from the display panel within the second communication period, it controls the motherboard to restart and does not adjust the operating state of the display panel.

[0028] In another aspect, a projection device is provided, comprising: a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps performed by the control circuit in the control method of the projection device as described above.

[0029] In another aspect, a computer-readable storage medium is provided, wherein instructions are stored therein, which, when executed by a processor, implement the steps performed by the control circuit in the control method of the projection device as described above.

[0030] In another aspect, a computer program product containing instructions is provided, which, when run on the computer, causes the computer to perform the steps executed by the control circuit in the control method of the projection device described above.

[0031] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0032] This disclosure provides a projection device and its control method. When the control circuit in the projection device determines that the motherboard is in a frozen state, but the display panel is not frozen, it can first control the light valve to reset, and then control the light valve power supply circuit to stop supplying power to the light valve. Furthermore, the control circuit can also control the light valve power supply circuit to stop supplying power to the light valve when it determines that the display panel is frozen. This avoids situations where the user directly unplugs the power to restart the projection device, which could damage the light valve and thus extend the lifespan of the projection device. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a projection device provided in an embodiment of this disclosure;

[0035] Figure 2 This is a schematic diagram of the structure of another projection device provided in an embodiment of this disclosure;

[0036] Figure 3 This is a schematic diagram of the structure of another projection device provided in this embodiment;

[0037] Figure 4 This is a schematic diagram of the structure of another projection device provided in an embodiment of this disclosure;

[0038] Figure 5 This is a schematic diagram of the structure of another projection device provided in an embodiment of this disclosure;

[0039] Figure 6 This is a schematic diagram of the structure of another projection device provided in this embodiment;

[0040] Figure 7 This is a schematic diagram of the structure of another projection device provided in an embodiment of this disclosure;

[0041] Figure 8 This is a structural diagram of a projection device provided by related technologies;

[0042] Figure 9 This is a schematic diagram of the structure of another projection device provided in this embodiment;

[0043] Figure 10 This is a flowchart of a control method for a projection device provided in an embodiment of this disclosure;

[0044] Figure 11 This is a flowchart of another control method for a projection device provided in this embodiment of the present disclosure;

[0045] Figure 12 This is a flowchart of another control method for a projection device provided in this disclosure embodiment;

[0046] Figure 13 This is a flowchart of another control method for a projection device provided in this disclosure embodiment;

[0047] Figure 14This is a flowchart of another control method for a projection device provided in an embodiment of this disclosure. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0049] Figure 1 This is a schematic diagram of the structure of a projection device provided in an embodiment of this disclosure. For example... Figure 1 As shown, the projection device may include: a motherboard 10, a display panel 20, a light valve 30, a light source 40, a projection lens 50, a control circuit 60, and a light valve power supply circuit 70 connected to the light valve 30. Optionally, the light valve 30 may include multiple digital micromirror devices (DMDs) arranged in an array. The light source 40 may be a laser, such as a blue laser, a red laser, or a green laser. The light source 40 is used to emit a laser beam. The control circuit 60 may be a microcontroller unit (MCU).

[0050] The motherboard 10 is connected to the display panel 20, and the motherboard 10 is used to send image signals to the display panel 20.

[0051] Optionally, the control circuit 60 and the display board 20 can be connected via an inter-integrated circuit (I2C) bus, and the motherboard 10 can send image signals to the display board 20 via the I2C bus.

[0052] The display panel 20 is also connected to the light valve 30. The display panel 20 is used to generate a light valve control signal based on the image signal and control the light valve 30 to flip according to the light valve control signal so as to transmit the light beam emitted by the light source 40 to the projection lens 50.

[0053] Optionally, the display panel 20 can generate a light valve control signal based on the pixel value of the pixel in the image signal, and control the light valve 30 to flip according to the light valve control signal. The flipped light valve 30 can transmit the light beam illuminating its surface from the light source 40 to the projection lens 50.

[0054] The projection lens 50 is used to project the light beam into an image. The projection lens 50 is used to project the light beam onto a projection screen, thereby displaying an image on the projection screen.

[0055] The control circuit 60 is connected to the motherboard 10, the display board 20, and the light valve power supply circuit 70. If a forced shutdown operation is detected, the control circuit 60 checks whether the motherboard 10 and the display board 20 are in a frozen state. If the motherboard 10 is frozen but the display board 20 is not, it controls the light valve to reset 30. After the light valve 30 is reset, it controls the light valve power supply circuit 70 to stop supplying power to the light valve 30. If the display board 20 is frozen, it controls the light valve power supply circuit 70 to stop supplying power to the light valve 30, thus releasing the charge in the light valve 30. This prevents the charge stored in the light valve 30 from driving it to deflect at a large angle, which could cause large deflections of the multiple digital micromirrors (DMIs) included in the light valve 30, leading to collisions between any two adjacent DMIs and resulting in damage to some of them.

[0056] In this embodiment, the motherboard 10 may include a system-on-a-chip (SoC), which may have multiple applications installed. During image projection by the projection device, if a large number of applications are running on the SoC, the motherboard 10 may crash. The digital light processing (DLP) chip included in the display panel 20 may also crash during operation, causing the display panel 20 to crash as well.

[0057] refer to Figure 2 The remote control for controlling the projection device may have a target button 00, and / or the projection device housing may have a target button 00. The forced shutdown operation can be a pressing operation on the target button 00 on the projection device, or the forced shutdown operation can be a pressing operation on the target button 00 on the remote control. Optionally, the target button 00 can be a power off button, or the target button 00 can be multiple buttons, and the forced shutdown operation can be a combined pressing operation on the multiple buttons.

[0058] Assuming the target button 00 is a power-off button, after detecting a user's press operation on the target button 00, the control circuit 60 can detect whether the duration of the press operation is greater than a target duration. If the duration of the press operation is less than or equal to the target duration, the control circuit 60 can determine that a power-off operation has been detected. At this time, the control circuit 60 can control the motherboard 10 to execute the normal power-off process, that is, the control circuit 60 can control the motherboard 10 to shut down some components in the motherboard 10 and other components in the projection device.

[0059] Optionally, the control circuit 60 may be provided with a first general purpose input / output (GPIO) port, GPIO_1. If the signal detected by the control circuit 60 at the first GPIO_1 port is invalid, the control circuit 60 can determine that a user press operation on the target button 00 has been detected. If the signal detected by the control circuit 60 at the first GPIO_1 port is valid, the control circuit 60 can determine that no user press operation on the target button 00 has been detected. The invalid level can be low, and the valid level can be high; or, the invalid level can be high, and the valid level can be low.

[0060] For example, if the invalid level is low, the voltage of the signal detected by the control circuit 60 on the first GPIO_1 port is less than 0.7 volts (V).

[0061] The control circuit 60 is also provided with a second GPIO_2 port. After detecting a power-off operation, the control circuit 60 can output an invalid level signal through the second GPIO_2 port, and the motherboard 10 will then execute the normal power-off process upon receiving the invalid level signal.

[0062] If the control circuit 60 detects that the duration of the pressing operation exceeds the target duration, the control circuit 60 can confirm that a forced shutdown operation has been detected. At this time, the control circuit 60 can detect whether the motherboard 10 and the display panel 20 are in a frozen state. The target duration is a fixed duration pre-stored in the control circuit 60.

[0063] In summary, the embodiments of this disclosure provide a projection device in which the control circuit, upon determining that the mainboard is in a frozen state while the display panel is not frozen, first controls the light valve to reset, and then controls the light valve power supply circuit to stop supplying power to the light valve. Furthermore, when the display panel is determined to be frozen, the light valve power supply circuit can be controlled to stop supplying power to the light valve. This avoids situations where users directly unplug the power to restart the projection device, which could damage the light valve and thus extend the lifespan of the projection device.

[0064] In this embodiment, during the process of detecting whether the motherboard 10 and the display panel 20 are in a frozen state, the control circuit 60 can send probe messages to both the motherboard 10 and the display panel 20. If the control circuit 60 receives a response message from the motherboard 10 within a first communication duration, the control circuit 60 can determine that the motherboard 10 is not in a frozen state. If the control circuit 60 does not receive a response message from the motherboard 10 within the first communication duration, the control circuit 60 can determine that the motherboard 10 is in a frozen state. The first communication duration can be a fixed duration pre-stored in the control circuit 60.

[0065] If the control circuit 60 receives a response message from the display panel 20 within the second communication duration, the control circuit 60 can determine that the display panel 20 is not in a frozen state. If the control circuit 60 does not receive a response message from the display panel 20 within the second communication duration, the control circuit 60 can determine that the display panel 20 is in a frozen state. The second communication duration can be a fixed duration pre-stored in the control circuit 60.

[0066] Optionally, the control circuit 60 can be connected to the motherboard 10 and the display board 20 via I2C respectively. Then, the control circuit 60 can send detection messages to the motherboard 10 and the display board 20 via I2C, and at the same time, the motherboard 10 and the display board 20 can send response messages to the control circuit 60 via I2C.

[0067] In this embodiment, if the control circuit 60 detects that the mainboard 10 is in a frozen state while the display panel 20 is not frozen, it can send a reset command to the display panel 20. The display panel 20 can respond to the reset command and control the light valve 30 to reset.

[0068] refer to Figure 3 The light valve 30 includes multiple digital micromirror devices arranged in an array, with a small distance between any two adjacent digital micromirror devices. During the power-on process of the projection device, the display panel 20 is also used to control the light valve power supply circuit 70 to supply power to the light valve 30 and transmit a first target control signal to the light valve 30. The first target control signal is used to control the light valve 30 to deflect from its initial position to the target position. Subsequently, during the image display process of the projection device, the display panel 20 controls the light valve 30 to deflect from the target position using the light valve control signal Ct. The deflected light valve 30 is used to transmit the light beam from the light source 40 to the projection lens 50.

[0069] During the reset process of the light valve 30, the display panel 20 sends a second target control signal to the light valve 30, which is used to control the light valve 30 to deflect back to its initial position. Afterwards, the display panel 20 controls the light valve power supply circuit 70 to stop supplying power to the light valve 30, so that the light valve 30 releases all its stored charge.

[0070] If the display panel 20 does not control the light valve 30 to reset before the display panel 20 is powered off, then after the control circuit 60 controls the display panel 20 to be powered off, the light valve power supply circuit 70 stops supplying power to the light valve 30. At this time, the light valve 30 has not deflected to its initial position, and the charge stored in the light valve 30 has not been completely released. The charge stored in the light valve 30 will then drive the light valve 30 to deflect at a large angle, that is, the multiple digital micromirror devices included in the light valve 30 will deflect at a large angle, thereby causing any two adjacent digital micromirror devices to collide, resulting in damage to some of the digital micromirror devices.

[0071] In this embodiment, if the control circuit 20 detects that the mainboard 10 is in a frozen state while the display board 20 is not frozen, it sends a reset command to the display board 20 to reset the light valve 30 before the display board 20 is powered off, and controls the light valve power supply circuit 70 to stop supplying power to the light valve 30. This avoids situations where the display board 20 fails to reset the light valve 30 after power failure, or where the charge stored in the light valve 30 is not fully released, thus ensuring the reliability of the control of the light valve 30.

[0072] refer to Figure 4 The power supply circuit 70 for the light valve may include a first switch sub-circuit U1, a second switch sub-circuit U2, a third switch sub-circuit U3, a fourth switch sub-circuit U4, a first circuit R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first power supply terminal Vc, a second power supply terminal Vo, a third power supply terminal Vb, a fourth power supply terminal Vr, a fifth power supply terminal G1, a sixth power supply terminal G2, a seventh power supply terminal G3, and an eighth power supply terminal G4.

[0073] The control terminal of the first switch sub-circuit U1 is connected to the display panel 20. The input terminal of the first switch sub-circuit U1 is connected to one end of the first resistor R1, the control terminal of the second switch sub-circuit U2, the control terminal of the third switch sub-circuit U3, and the control terminal of the fourth switch sub-circuit U4, respectively. The output terminal of the first switch sub-circuit U1 is connected to the fifth power supply terminal G1, and the other end of the first resistor R1 is connected to the first power supply terminal Vc.

[0074] The input terminal of the second switch sub-circuit U2 is connected to one end of the second resistor R2, the output terminal of the second switch sub-circuit U2 is connected to the sixth power supply terminal G2, the other end of the second resistor R2 is connected to one end of the second power supply terminal Vo, and the other end of the second power supply terminal Vo is connected to the light valve 30.

[0075] The input terminal of the third switch sub-circuit U3 is connected to one end of the third resistor R3, the output terminal of the third switch sub-circuit U3 is connected to the seventh power supply terminal G3, the other end of the third resistor R3 is connected to one end of the third power supply terminal Vb, and the other end of the third power supply terminal Vb is connected to the light valve 30.

[0076] The input terminal of the fourth switch sub-circuit U4 is connected to one end of the fourth resistor R4, the output terminal of the fourth switch sub-circuit U4 is connected to the eighth power supply terminal G4, the other end of the fourth resistor R4 is connected to one end of the fourth power supply terminal Vr, and the other end of the fourth power supply terminal Vr is connected to the light valve 30.

[0077] Optionally, the first power supply terminal Vc, the second power supply terminal Vo, the third power supply terminal Vb and the fourth power supply terminal Vr can all be DC power supply terminals, and the fifth power supply terminal G1, the sixth power supply terminal G2, the seventh power supply terminal G3 and the eighth power supply terminal G4 can all be ground terminals (GND).

[0078] refer to Figure 3 and Figure 4 During the projection display of an image by the projection device, the display panel 20 outputs an enable signal EN to the light valve power supply circuit 70. The first switch sub-circuit U1 is turned on when the enable signal is at an effective level. At this time, the power signal provided by the first power supply terminal Vc passes through the first resistor R1, and part of the signal is transmitted to the fifth power supply terminal G1 through the first switch sub-circuit U1. The other part of the signal is transmitted to the control terminals of the second switch sub-circuit U2, the third switch sub-circuit U3, and the fourth switch sub-circuit U4 to transmit power signals.

[0079] Because the voltage of this other part of the signal is low, the second switch sub-circuit U2, the third switch sub-circuit U3, and the fourth switch sub-circuit U4 are disconnected under the control of this other part of the signal. At this time, the second switch sub-circuit U2, the third switch sub-circuit U3, and the fourth switch sub-circuit U4 are not conducting, and the second power supply terminal Vo, the third power supply terminal Vb, and the fourth power supply terminal Vr respectively transmit power signals to the light valve 30, thereby realizing the power supply to the light valve 30. At the same time, the display panel 20 transmits the light valve control signal Ct to the light valve 30 to control the deflection of the light valve 30.

[0080] The voltage of the power signal transmitted from the second power supply terminal Vo to the optical valve 30 can be V1, the voltage of the power signal transmitted from the third power supply terminal Vb to the optical valve 30 can be V2, and the voltage of the power signal transmitted from the fourth power supply terminal Vr to the optical valve 30 can be V3.

[0081] During the reset process of the control light valve 30, the display panel 20 first transmits a second target control signal to the light valve 30, which then returns to its initial position under the control of this second target control signal. Afterwards, while controlling the light valve power supply circuit 70 to stop supplying power to the light valve 30, the display panel 20 transmits an enable signal EN at an invalid level to the control terminal of the first switch sub-circuit U1, at which point the first switch sub-circuit U1 is disconnected. The power signal transmitted from the first power supply terminal Vc is then transmitted through the first resistor R1 to the control terminals of the second switch sub-circuit U2, the third switch sub-circuit U3, and the fourth switch circuit U4.

[0082] Since the first switch sub-circuit U1 is open, it does not divide the voltage. Therefore, the voltage of the power signal transmitted to the second switch sub-circuit U2, the third switch sub-circuit U3, and the fourth switch sub-circuit U4 is relatively high. Consequently, the second switch sub-circuit U2, the third switch sub-circuit U3, and the fourth switch sub-circuit U4 are turned on under the control of this power signal. At this time, the charge stored in the light valve 30 and the power signal provided by the second power terminal Vo are transmitted to the sixth power terminal G2 via the second resistor R2 and the second switch sub-circuit U2. The charge stored in the light valve 30 and the power signal provided by the third power terminal Vb are transmitted to the seventh power terminal G3 via the third resistor R3 and the third switch sub-circuit U3. The charge stored in the light valve 30 and the power signal provided by the fourth power terminal Vr are transmitted to the eighth power terminal G4 via the fourth resistor R4 and the fourth switch sub-circuit U4, thereby realizing the rapid release of the charge stored in the light valve 30.

[0083] refer to Figure 5 The projection device may further include a power supply control circuit N1, the first input terminal of which is connected to the control circuit 60, the second input terminal of which is connected to the display panel 20, and the output terminal of which is connected to the light valve power supply circuit 70. Optionally, the power supply control circuit N1 may be a logic AND device.

[0084] The control circuit 60 is also used to send a first control signal to the power supply control circuit N1. The display panel 20 is also used to send an enable signal EN to the power supply control circuit N1. When the display panel 20 is powered on, the enable signal EN is at an active level, and when the display panel 20 is powered off, the enable signal EN is at an inactive level.

[0085] Optionally, the control circuit 60 is also provided with a third GPIO_3 port, through which the control circuit 60 can send a first control signal to the power supply control circuit N1.

[0086] The power supply control circuit N1 is used to control the light valve power supply circuit 70 to stop supplying power to the light valve 30 when either the first control signal or the enable signal EN is at an invalid level, and the power supply control circuit N1 is used to control the light valve power supply circuit 70 to supply power to the light valve 30 when both the first control signal and the enable signal EN are at an active level.

[0087] When the display panel 20 is in a frozen state, the first control signal is at an invalid level. When the main board 10 is in a frozen state, but the display panel 20 is not in a frozen state, the first control signal is at an invalid level.

[0088] In this embodiment of the disclosure, the control circuit 60 is further configured to control the circuit boards in the motherboard 10 and display board 20 that are in a frozen state to restart if the motherboard 10 and / or display board 20 are detected to be in a frozen state.

[0089] refer to Figure 5 The projection device may also include a first switch SW1, a second switch SW2, and a power board 80. The control terminal of the first switch SW1 is connected to the control circuit 60, the input terminal of the first switch SW1 is connected to the power board 80, and the output terminal of the first switch SW1 is connected to the main board 10.

[0090] The control terminal of the second switch SW2 is connected to the control circuit 60 and / or the main board 10, the input terminal of the second switch SW2 is connected to the power board 80, and the output terminal of the second switch SW2 is connected to the display board 20.

[0091] refer to Figure 5 The control terminal of the second switch SW2 is connected to the mainboard 10. Alternatively, refer to... Figure 6 The control terminal of the second switch SW2 is connected to the control circuit 60. Alternatively, refer to... Figure 7 The control terminal of the second switch SW2 is connected to the control circuit 60 and the main board 10.

[0092] The control circuit 60 is used to control the first switch SW1 to open if the motherboard 10 is detected to be in a frozen state, and to control the first switch SW1 to close after the first switch SW1 has been open for a first duration. The first duration is a fixed duration pre-stored in the control circuit 60.

[0093] In this embodiment, after the control circuit 60 controls the first switch SW1 to open, the power board 80 stops providing power signals to the motherboard 10, thereby putting the motherboard 10 into a power-off state. After the control circuit 60 controls the first switch SW1 to close, the power board 80 can provide power signals to the motherboard 10, thereby putting the motherboard 10 into a power-on state. By first controlling the first switch SW1 to open and then controlling the first switch SW1 to close, the control circuit 60 achieves the goal of first putting the motherboard 10 into a power-off state and then putting it into a power-on state, thereby restarting the motherboard 10.

[0094] The control circuit 60 is used to control the second switch SW2 to open if the display panel 20 is detected to be in a frozen state, and to control the second switch SW2 to close after a second period of time since the second switch SW2 has been opened. The second period is a fixed period pre-stored in the control circuit 60.

[0095] In this embodiment, after the control circuit 60 controls the second switch SW2 to open, the power board 80 stops providing power signals to the display panel 20, thereby putting the display panel 20 into a power-off state. After the control circuit 60 controls the second switch SW2 to close, the power board 80 can provide power signals to the display panel 20, thereby putting the display panel 20 into a power-on state. By first controlling the second switch SW2 to open and then controlling the second switch SW2 to close, the control circuit 60 achieves the goal of first putting the display panel 20 into a power-off state and then putting it into a power-on state, thereby restarting the display panel 20.

[0096] In this embodiment of the disclosure, when the host 10 is in a frozen state and the display panel 20 is not in a frozen state, the control circuit 60 can control the motherboard 10 and the display panel 20 to restart respectively, or it can control only the motherboard 10 to restart.

[0097] If the control circuit 60 restarts both the motherboard 10 and the display board 20, the control circuit 60 is also used to send a reset command to the display board 20 if it detects that the motherboard 10 is in a frozen state while the display board 20 is not frozen. The display board 20 can then control the light valve 30 to reset in response to the reset command. After resetting the light valve 30, the display board 20 sends a reset confirmation message to the control circuit 60. Upon receiving the reset confirmation message, the control circuit 60 controls the light valve power supply circuit 70 to stop supplying power to the light valve 30. Then, it controls the first switch SW1 to open, and after a first duration of opening the first switch SW1, it opens the first switch SW1 to close.

[0098] Optionally, the display board 20 is provided with a fourth GPIO_4 port, through which the display board 20 can send reset confirmation information to the control circuit 60.

[0099] In a scenario where the host 10 is in a frozen state, but the display panel 20 is not frozen, the control circuit 60 controls the host 10 and the display panel 20 to restart respectively after the control light valve power supply circuit 70 stops supplying power to the light valve 30. This is an optional implementation method according to an embodiment of this disclosure. (Refer to...) Figure 5 The control terminal of the second switch SW2 is connected to the main board 10. The main board 10 is used to control the second switch SW2 to close when the power is on, and to open the second switch SW2 when the main board 10 is de-energized.

[0100] When the mainboard 10 is powered on, the power board 80 provides a power signal to the display board 20 because the second switch SW2 is closed, and the display board 20 is powered on. When the mainboard 10 is powered off, the power board 80 stops providing a power signal to the display board 20 because the second switch SW2 is open, and the display board 20 is powered off.

[0101] In this embodiment, after the control circuit 60 stops supplying power to the light valve 30 via the control light valve power supply circuit 70, it first disconnects the first switch SW1, causing both the main board 10 and the display board 20 to be in a power-off state. Then, the control circuit 60 controls the first switch SW1 to close, causing the main board 10 and the display board to be powered on, thereby enabling the control circuit 60 to restart both the main board 10 and the display board 20 respectively.

[0102] In a scenario where the host 10 is in a frozen state, but the display panel 20 is not frozen, and the control circuit 60 controls the host 10 and the display panel 20 to restart respectively after the control light valve power supply circuit 70 stops supplying power to the light valve 30, as another optional implementation of this disclosure embodiment, see reference. Figure 7 The projection device may also include a switch control circuit N2. The first input terminal of the switch control circuit N2 is connected to the control circuit 60, the second input terminal of the switch control circuit N2 is connected to the main board 10, and the output terminal of the switch control circuit N2 is connected to the control terminal of the second switch SW2, thereby connecting the control terminal of the second switch SW2 to the main board 10 and the control circuit 60. Optionally, refer to... Figure 7 The switch control circuit N2 can be a logic OR device.

[0103] The control circuit 60 is also used to send a second control signal to the switch control circuit N2, and the main board 10 is used to send a third control signal to the switch control circuit N2. The switch control circuit N2 is used to control the second switch SW2 to close if it detects that the second control signal is at a valid level, and / or that the third control signal is at a valid level. The switch control circuit N2 is also used to control the second switch SW2 to open if it detects that both the second and third control signals are at invalid levels.

[0104] Optionally, after the control circuit 60 stops supplying power to the light valve 30 via the control light valve power supply circuit 70, the level of the second control signal sent to the switch control circuit N2 is invalid. When the motherboard 10 is in a frozen state or a power-off state, the level of the third control signal sent by the motherboard 10 to the switch control circuit N2 is invalid.

[0105] In this embodiment, after the control circuit 60 stops supplying power to the light valve 30 via the control light valve power supply circuit 70 and sends a second control signal at an invalid level to the switch control circuit N2, the control circuit 60 can first control the main board 10 to be in a power-off state, and then control the display board 20 to be in a power-off state. Afterwards, the control circuit 60 can control the main board 10 and the display board 20 to be in a power-on state.

[0106] Since the third control signal is invalid and the second control signal is invalid when the motherboard 10 is in a power-off state, the switch control circuit N2 can control the second switch SW2 to open, and the display board 20 is also in a power-off state at this time.

[0107] This embodiment of the disclosure does not limit the order in which the control circuit 60 controls the motherboard 10 and the display panel 20 to be powered on. For example, the control circuit 60 may first control the motherboard 10 to be powered on, and then control the display panel 20 to be powered on. Optionally, the control circuit 60 may first control the first switch SW1 to close, thereby controlling the motherboard 10 to be powered on. Then, the control circuit 60 may send a switch closing command to the motherboard 10, and / or, the control circuit 60 may send a signal to the first switch, which may be at an active or inactive level. In response to the switch opening command, the motherboard 10 may send a third control signal at an active level to the switch control circuit N2, so that the switch control circuit N2 controls the second switch SW2 to close, thereby enabling the display panel 20 to be powered on.

[0108] Alternatively, the control circuit 60 can first power on the display panel 20, and then power on the main board 10. Optionally, the control circuit 60 can send a second control signal at an active level to the switch control circuit N2, causing the switch control circuit N2 to close the second switch SW2, thereby powering on the display panel 20. Afterwards, the control circuit 20 can control the first switch SW1 to close, thus powering on the main board 10.

[0109] Alternatively, the control circuit 60 can simultaneously power on both the motherboard 10 and the display panel 20. Optionally, the control circuit 60 can send a second control signal at an active level to the switch control circuit N2 while simultaneously closing the first switch SW1.

[0110] Optionally, the control circuit 60 may also be provided with a fifth GPIO_5 port, through which the control circuit 60 can send a second control signal to the switch control circuit N2. The motherboard 10 may be provided with a sixth GPIO_6 port, through which the motherboard 10 can send a third control signal to the switch control circuit N2.

[0111] refer to Figure 7 If the control circuit 60 detects that the display panel 20 is in a frozen state while the mainboard 10 is not frozen, the control circuit 60 can first control the light valve power supply circuit 70 to stop supplying power to the light valve 30. Then, the control circuit 60 can control the display panel 20 to restart. During the restart process, the control circuit 60 can control only the display panel 20 to restart, or it can control both the display panel 20 and the mainboard 10 to restart separately; this embodiment does not limit the specific actions taken in this regard.

[0112] For scenarios where the control circuit 60 detects that the display panel 20 is in a frozen state, but the motherboard 10 is not frozen, the control circuit 60 can control only the display panel 20 to restart. As an optional implementation method, refer to... Figure 7 The control circuit 60 can send a switch-off command to the main board 10, and the main board 10 can respond to the switch-off command by sending a third control signal at an invalid level to the switch control circuit N2. Simultaneously, the control circuit 60 also sends a second control signal at an invalid level to the switch control circuit N2. The switch control circuit N2 can then respond to the second and third control signals to open the second switch SW2, thereby putting the display panel 20 into a power-off state.

[0113] Subsequently, after the second switch SW2 has been open for a second period, the control circuit 40 can send a switch closing command to the main board 10. In response to this command, the main board 10 can send a third control signal at an active level to the switch control circuit N2. At this time, the level of the second control signal sent by the control circuit 60 to the switch control circuit N2 can be either inactive or active. Under the control of the second and third control signals, the switch control circuit N2 can close the second switch SW2, thereby powering on the display panel 20 and restarting it. Alternatively, after the second switch SW2 has been open for a second period, the control circuit 40 can send a second control signal at an active level to the switch control circuit N2. Under the control of this signal, the switch control circuit N2 can close the second switch SW2, thereby powering on the display panel 20 and restarting it.

[0114] For the scenario where the control circuit 60 detects that the display panel 20 is in a frozen state, but the motherboard 10 is not frozen, and the control circuit 60 only controls the display panel 20 to restart, as an alternative implementation method, refer to... Figure 5 The control circuit 60 can send a switch-off command to the main board 10. In response to this command, the main board 10 can control the second switch SW2 to open, thereby putting the display panel 20 in a disconnected state. Then, after a second period of time since the second switch SW2 has been open, the control circuit 40 can send a switch-closing command to the main board 10. In response, the main board 10 can control the second switch SW2 to close, thereby restarting the display panel 20.

[0115] When the control circuit 60 detects that the display panel 20 is in a frozen state while the motherboard 10 is not frozen, the control circuit 60 can also control the motherboard 10 and the display panel 20 to restart separately. Optionally, the control circuit 20 can first control the motherboard 10 and the display panel 20 to be in a power-off state, and then control the motherboard 10 and the display panel 20 to be in a power-on state.

[0116] In this embodiment, the order in which the control circuit 60 controls the motherboard 10 and the display panel 20 to be in a power-off state, and the order in which the control circuit 60 controls the motherboard 10 and the display panel 20 to be in a power-on state are not limited.

[0117] For example, the control circuit 60 can first control the display panel 20 to be in a power-off state, and then control the motherboard 10 to be in a power-off state. Afterwards, the control circuit 60 can control the motherboard 10 to be in a power-on state, and then control the display panel 20 to be in a power-on state, thereby restarting the motherboard 10 and the display panel 20. The process of the control circuit 60 controlling the display panel 20 to be in a power-on and power-off state, and the process of the control circuit 60 controlling the motherboard 10 to be in a power-on and power-off state, can be referred to the above embodiments, and will not be repeated here.

[0118] In this embodiment of the disclosure, if both the motherboard 10 and the display board 20 are in a frozen state, the control circuit 60 is also used to first control the light valve power supply circuit 70 to stop supplying power to the light valve 30, and then control the motherboard 10 and the display board 20 to restart respectively. The process of the control circuit 60 controlling the motherboard 10 and the display board 20 to restart can be referred to the above embodiment, and will not be repeated here.

[0119] Optional, see reference Figure 5 and Figure 7 The control circuit 60 can control the motherboard 10 to be in a power-off state, then control the motherboard 10 to be in a power-on state, and then control the display board 20 to be in a power-on state.

[0120] In this embodiment of the disclosure, after the control circuit 60 controls the main board 10 and the display board 20 to be in a power-off state, it can also turn off the light source 40, thereby preventing the projection lens from projecting a laser beam onto the projection screen when the projection screen is not displaying an image, thus ensuring the display effect.

[0121] In related technologies, refer to Figure 8 The projection device may include a motherboard 1, a display panel 2, a power supply board 3, a light valve 4, a power supply circuit 5, and a switch SW. The power supply board 3 is connected to both the motherboard 1 and the display panel 2. The display panel 2 is connected to both the light valve 4 and the power supply circuit 5. The control terminal of the switch SW is connected to the motherboard 1, the input terminal of the switch SW is connected to the power supply board 3, and the output terminal of the switch SW is connected to the display panel 2. The power supply board 3 can supply power to the motherboard 1, the display panel 2, and other components in the projection device. The power supply circuit 5 supplies power to the light valve 4.

[0122] During the normal shutdown process of the projection device, the motherboard 1, upon detecting a user's click command on the power button 0, generates a shutdown command. This command is then sent to the display board 2. The display board 2, in response to the shutdown command, controls the light valve 4 to deflect to its initial position and controls the power supply circuit 5 to stop supplying power to the light valve 4. The display board 2 then sends a confirmation command to the motherboard 1. In response to this confirmation command, the motherboard 1 controls the power board 3 to stop supplying power to some components in the motherboard 1, the display board 2, and other components in the projection device, thereby shutting down the projection device. Afterwards, the motherboard 1, in response to a power-on command, controls the power board 3 to supply power to all components in the projection device, thereby restarting the projection device.

[0123] In related technologies, when motherboard 1 crashes, it cannot detect or respond to shutdown commands. In this situation, the user can only unplug the projector's power supply, plug it back in, and then restart the projector to restart motherboard 1. However, since other components in the projector may still be operating after motherboard 1 crashes, restarting the motherboard by unplugging the power supply may damage the light valve in the projector.

[0124] In this embodiment, when the control circuit in the projection device determines that the motherboard is in a frozen state but the display panel is not frozen, it can first control the light valve to reset, and then control the light valve power supply circuit to stop supplying power to the light valve. When the display panel is determined to be frozen, the light valve power supply circuit can be controlled to stop supplying power to the light valve. This avoids the situation where the user directly unplugs the power supply to restart the projection device, which could damage the light valve and ensure the reliability of the projection device operation.

[0125] In summary, the embodiments of this disclosure provide a projection device in which the control circuit, upon determining that the motherboard is in a frozen state while the display panel is not frozen, first controls the light valve to reset, and then controls the light valve power supply circuit to stop supplying power to the light valve. Furthermore, this control circuit can also control the light valve power supply circuit to stop supplying power to the light valve when it determines that the display panel is frozen. This avoids situations where users directly unplug the power to restart the projection device, which could damage the light valve and thus extend the lifespan of the projection device.

[0126] Figure 9 This is a schematic diagram of the structure of another projection device provided in an embodiment of this disclosure. For example... Figure 9 As shown, the projection device may include a motherboard 10, a display panel 20, a light valve 30, a light source 40, a projection lens 50, and a control circuit 60.

[0127] The motherboard 10 is connected to the display panel 20, and the motherboard 10 is used to send image signals to the display panel 20;

[0128] The display panel 20 is also connected to the light valve 30. The display panel 20 is used to generate a light valve control signal based on the image signal, and to control the light valve 30 to flip according to the light valve control signal, so as to transmit the light beam emitted by the light source 40 to the projection lens 50. The projection lens 50 is used to project the light beam into an image.

[0129] The control circuit 60 is connected to the motherboard 10 and the display board 20 respectively. If a forced shutdown operation is detected, the control circuit 60 is used to detect whether the motherboard 10 and the display board 20 are in a frozen state. If the motherboard 10 is detected to be in a frozen state and the display board 20 is not in a frozen state, the control circuit 60 controls the motherboard 10 to restart without adjusting the operating state of the display board 20.

[0130] In summary, the embodiments of this disclosure provide a projection device in which the control circuit, upon detecting a forced shutdown operation, determines that the mainboard is in a frozen state while the display panel is not frozen, and can then control the mainboard to restart. This avoids situations where users directly unplug the power to restart the projection device, potentially damaging components and ensuring the reliability of the projection device's operation.

[0131] If the host 10 is in a frozen state while the display panel 20 is not frozen, and the main control circuit 60 only controls the motherboard 10 to restart, then the main control circuit 60 is also used to send a prompt command to the display panel 20 if it detects that the motherboard 10 is frozen while the display panel 20 is not frozen. The display panel 20 is also used to respond to the prompt command by displaying a prompt message on the projection screen and sending a confirmation message to the main control circuit 60, which indicates that the motherboard 10 is restarting. The main control circuit 60 is used to control the motherboard 10 to restart after receiving the confirmation message.

[0132] refer to Figure 7 During the restart process of the main control circuit 60, which only controls the motherboard 10, a second control signal at an effective level is sent to the switch control circuit N1. This ensures that when the motherboard 10 is powered off, the switch control circuit N1 can control the second switch SW2 to close, thereby ensuring that the display panel 20 is powered on. Furthermore, by controlling the display panel 20 to display a prompt message on the projection screen, the user is informed that the motherboard 10 is currently restarting, preventing the user from directly unplugging the power supply during the restart process, thus ensuring the reliability of the projection device control.

[0133] Optionally, the main control circuit 60 can send prompt commands to the display panel 20 via I2C. The display panel 20 can also send prompt confirmation messages to the main control circuit 60 via I2C.

[0134] In this embodiment of the disclosure, after the main control circuit 60 controls the motherboard 10 to restart, the motherboard 10 can send an image signal to the display panel 20 so that the display panel 20 can display an image.

[0135] In summary, the embodiments of this disclosure provide a projection device in which the control circuit, upon determining that the motherboard is in a frozen state while the display panel is not frozen, first controls the light valve to reset, and then controls the light valve power supply circuit to stop supplying power to the light valve. Furthermore, this control circuit can also control the light valve power supply circuit to stop supplying power to the light valve when it determines that the display panel is frozen. This avoids situations where users directly unplug the power to restart the projection device, which could damage the light valve and thus extend the lifespan of the projection device.

[0136] Figure 10 This is a flowchart of a control method for a projection device provided in an embodiment of this disclosure, applied to... Figure 1 , Figure 2 , Figures 5 to 7 In any of the projection devices shown, such as Figure 10 As shown, the method may include:

[0137] Step 1001: If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display board respectively.

[0138] Step 1002: If the control circuit detects that it has not received a response signal from the motherboard within the first communication duration, but has received a response signal from the display board within the second communication duration, it controls the light valve to reset, and after the light valve is reset, it controls the light valve power supply circuit to stop supplying power to the light valve.

[0139] Step 1003: If the control circuit detects that it has not received a response signal from the display panel within the second communication time, it controls the light valve power supply circuit to stop supplying power to the light valve.

[0140] In summary, this disclosure provides a control method for a projection device. When the control circuit in the projection device determines that the mainboard is in a frozen state but the display panel is not frozen, it can first control the light valve to reset, and then control the light valve power supply circuit to stop supplying power to the light valve. Furthermore, this control circuit can also control the light valve power supply circuit to stop supplying power to the light valve when it determines that the display panel is frozen. Therefore, it avoids situations where the user directly unplugs the power supply to restart the projection device, which could damage the light valve and thus extend the lifespan of the projection device.

[0141] Figure 11 This is a flowchart of a control method for a projection device provided in an embodiment of this disclosure. This method can be applied to... Figure 1 , Figure 2 , Figures 5 to 7In the projection device shown. For example... Figure 11 As shown, the method may include:

[0142] Step 1101: If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display board respectively.

[0143] Step 1102: If the control circuit detects that it has not received a response signal from the motherboard within the first communication duration, but has received a response signal from the display board within the second communication duration, it sends a reset command to the display board.

[0144] Step 1103: The display panel responds to the reset command and controls the light valve to reset.

[0145] Step 1104: The control circuit sends a first control signal at an invalid level to the power supply control circuit.

[0146] Step 1105: The display board sends an enable signal at an active level to the power supply control circuit.

[0147] Step 1106: Under the control of the first control signal at an invalid level and the enable signal at an effective level, the power supply control circuit controls the light valve power supply circuit to stop supplying power to the light valve.

[0148] Step 1107: The control circuit controls the motherboard to restart.

[0149] The implementation process of steps 1101 to 1107 above can be referred to the above device embodiment, and will not be repeated here.

[0150] In summary, this disclosure provides a control method for a projection device. When the control circuit in the projection device determines that the mainboard is in a frozen state but the display panel is not frozen, it can first control the light valve to reset, and then control the light valve power supply circuit to stop supplying power to the light valve. Furthermore, this control circuit can also control the light valve power supply circuit to stop supplying power to the light valve when it determines that the display panel is frozen. Therefore, it avoids situations where the user directly unplugs the power supply to restart the projection device, which could damage the light valve and thus extend the lifespan of the projection device.

[0151] Figure 12 This is a flowchart of a control method for a projection device provided in an embodiment of this disclosure. This method can be applied to, for example... Figure 1 , Figure 2 , Figures 5 to 7 In any of the projection devices shown. For example... Figure 12 As shown, the method may include:

[0152] Step 1201: If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display board respectively.

[0153] Step 1202: If the control circuit does not receive a response signal from the display panel within the second communication time, it sends a first control signal at an invalid level to the power supply control circuit.

[0154] Step 1203: The display board sends an enable signal at an active level to the power supply control circuit.

[0155] Specifically, when the display panel is powered on, the enable signal is at an active level; when the display panel is powered off, the enable signal is at an inactive level.

[0156] Step 1204: When either the first control signal or the enable signal is at an invalid level, the power supply control circuit controls the light valve power supply circuit to stop supplying power to the light valve.

[0157] Optionally, the projection device also includes a power supply control circuit. The first input terminal of the power supply control circuit is connected to the control circuit, the second input terminal is connected to the display panel, and the output terminal is connected to the light valve power supply circuit. The control circuit also sends a third control signal to the power supply control circuit.

[0158] Step 1205: The control circuit restarts the display board.

[0159] The implementation process of steps 1201 to 1205 above can be referred to the above device embodiment, and will not be repeated here.

[0160] In summary, this disclosure provides a control method for a projection device. When the control circuit in the projection device determines that the mainboard is in a frozen state but the display panel is not frozen, it can first control the light valve to reset, and then control the light valve power supply circuit to stop supplying power to the light valve. Furthermore, this control circuit can also control the light valve power supply circuit to stop supplying power to the light valve when it determines that the display panel is frozen. Therefore, it avoids situations where the user directly unplugs the power supply to restart the projection device, which could damage the light valve and thus extend the lifespan of the projection device.

[0161] Figure 13 This is a flowchart of a control method for a projection device provided in an embodiment of this disclosure. This method can be applied to, for example... Figure 7 or Figure 9 In the projection device shown. For example... Figure 13 As shown, the method may include:

[0162] Step 1301: If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display board respectively.

[0163] Step 1302: If the control circuit detects that it has not received a response signal from the motherboard within the first communication duration, but has received a response signal from the display board within the second communication duration, it controls the motherboard to restart and does not adjust the operating state of the display board.

[0164] The implementation process of steps 1301 and 1302 can be referred to the above device embodiments, and will not be repeated here.

[0165] In summary, the embodiments of this disclosure provide a control method for a projection device. When the control circuit in the projection device detects a forced shutdown operation, if it determines that the mainboard is in a frozen state while the display board is not frozen, it can control the mainboard to restart. This avoids situations where users directly unplug the power to restart the projection device, which could damage the components in the projection device, thereby extending the lifespan of the projection device.

[0166] Figure 14 This is a flowchart of another control method for a projection device provided in this disclosure embodiment, which can be applied to... Figure 7 or Figure 9 In the projection device shown. For example... Figure 14 As shown, the method may include:

[0167] Step 1401: If the control circuit detects a forced shutdown operation, it will check whether the motherboard and display board are in a frozen state.

[0168] Step 1402: If the control circuit detects that it has not received a response signal from the motherboard within the first communication duration, but has received a response signal from the display panel within the second communication duration, it sends a prompt command to the display panel.

[0169] Step 1403: The display panel responds to the prompt command by displaying the prompt information on the projection screen and sending a prompt confirmation message to the control circuit.

[0170] This message is used to indicate that the motherboard is restarting and to control the motherboard restart.

[0171] Step 1404: After receiving the confirmation message, the control circuit controls the motherboard to restart.

[0172] The implementation process of steps 1401 to 1404 above can be referred to the above device embodiment, and will not be repeated here.

[0173] In summary, the embodiments of this disclosure provide a control method for a projection device. When the control circuit in the projection device detects a forced shutdown operation, if it determines that the mainboard is in a frozen state while the display board is not frozen, it can control the mainboard to restart. This avoids situations where users directly unplug the power to restart the projection device, which could damage the components in the projection device, thereby extending the lifespan of the projection device.

[0174] It should be noted that the order of steps in the control method for the projection device provided in this application embodiment can be appropriately adjusted, and steps can also be deleted as needed. For example, steps 1102 to 1107 can be deleted as needed. Or steps 1202 to 1205 can be deleted as needed. Or step 1302 can be deleted as needed. Or steps 1402 to 1404 can be deleted as needed. Any variations that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application, and therefore will not be elaborated further.

[0175] This disclosure provides a projection device, including: a memory, a processor, and a computer program stored in the memory. When the processor executes the computer program, it implements the method embodiments described above (e.g., Figures 10 to 14 The steps performed by the control circuit in any of the embodiments shown.

[0176] This disclosure provides a computer-readable storage medium storing instructions that, when executed by a processor, implement the method embodiments described above (e.g., ...). Figures 10 to 14 The steps performed by the control circuit in any of the embodiments shown.

[0177] This disclosure provides a computer program product including instructions that, when executed on a computer, cause the computer to perform the method embodiments described above (e.g., Figures 10 to 14 The steps performed by the control circuit in any of the embodiments shown.

[0178] In this disclosure, the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," and "eighth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In this disclosure, the term "multiple" means two or more. In this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone.

[0179] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A projection device, characterized in that, The projection device includes: a motherboard, a display panel, a light valve, a light source, a projection lens, a control circuit, a light valve power supply circuit and a power supply control circuit connected to the light valve; The motherboard is connected to the display panel, and the motherboard is used to send image signals to the display panel; The display panel is also connected to the light valve. The display panel is used to generate a light valve control signal based on the image signal, and to control the light valve to flip according to the light valve control signal, so as to transmit the light beam emitted by the light source to the projection lens. The light valve includes multiple digital micromirror devices arranged in an array, and the light source is a laser. The projection lens is used to project the light beam into an image; The control circuit is connected to the first input terminal of the motherboard, the display board, and the power supply control circuit, respectively, and the control circuit is used for: If a forced shutdown operation is detected, then check whether the motherboard and the display board are in a frozen state. If the motherboard is detected to be in a frozen state, but the display panel is not in a frozen state, the light valve is controlled to reset, and after the light valve is controlled to reset, the light valve power supply circuit is controlled to stop supplying power to the light valve. If the display panel is detected to be in a frozen state, the power supply circuit of the light valve is controlled to stop supplying power to the light valve; The second input terminal of the power supply control circuit is connected to the display panel, and the output terminal of the power supply control circuit is connected to the light valve power supply circuit. The control circuit is also used to send a first control signal to the power supply control circuit; The display panel is also used to send an enable signal to the power supply control circuit; when the display panel is powered on, the enable signal is at an active level, and when the display panel is powered off, the enable signal is at an inactive level. The power supply control circuit is configured to control the light valve power supply circuit to stop supplying power to the light valve when either the first control signal or the enable signal is at an invalid level, and to control the light valve power supply circuit to supply power to the light valve when both the first control signal and the enable signal are at valid levels.

2. The projection device according to claim 1, characterized in that, The control circuit is used to send a reset command to the display panel if it detects that the motherboard is in a frozen state and the display panel is not in a frozen state. The display panel is used to control the light valve to reset in response to the reset command.

3. The projection device according to claim 1, characterized in that, The power supply control circuit is a logic AND device.

4. The projection device according to any one of claims 1 to 3, characterized in that, The control circuit is also used for: If the motherboard and / or the display board are detected to be in a frozen state, the circuit boards in the motherboard and the display board that are in a frozen state are controlled to restart.

5. The projection device according to claim 4, characterized in that, The projection device also includes: a first switch, a second switch, and a power board; The control terminal of the first switch is connected to the control circuit, the input terminal of the first switch is connected to the power board, and the output terminal of the first switch is connected to the motherboard. The control terminal of the second switch is connected to the control circuit and / or the motherboard, the input terminal of the second switch is connected to the power board, and the output terminal of the second switch is connected to the display board. The control circuit is also used to control the first switch to open if the motherboard is detected to be in a frozen state, and to control the first switch to close after the first switch has been open for a first period of time. The control circuit is also used to control the second switch to open if the display panel is detected to be in a frozen state, and to control the second switch to close after a second period of time since the second switch has been opened.

6. The projection device according to claim 5, characterized in that, The control terminal of the second switch is connected to the main board; The motherboard is used to control the closing of the second switch when the power is on; Furthermore, the second switch is turned off when the motherboard is in a power-off state.

7. The projection device according to claim 5, characterized in that, The projection device further includes: a switch control circuit, wherein a first input terminal of the switch control circuit is connected to the control circuit, a second input terminal of the switch control circuit is connected to the motherboard, and an output terminal of the switch control circuit is connected to the control terminal of the second switch; The control circuit is also used to send a second control signal to the switch control circuit; The motherboard is also used to send a third control signal to the switch control circuit; The switch control circuit is configured to control the second switch to close if the second control signal is detected to be at a valid level and / or the third control signal is detected to be at a valid level, and to control the second switch to open if both the second control signal and the third control signal are detected to be at an invalid level.

8. The projection device according to claim 7, characterized in that, The switch control circuit is a logic OR device.

9. A control method for a projection device, characterized in that, The projection device is used in a projection device, which includes: a control circuit, a motherboard, a display board, a light valve, a light valve power supply circuit, and a power supply control circuit. The control circuit is connected to the motherboard, the display board, and the first input terminal of the power supply control circuit. The second input terminal of the power supply control circuit is connected to the display board. The output terminal of the power supply control circuit is connected to the light valve power supply circuit, and the light valve power supply circuit is also connected to the light valve. The method includes: If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display panel respectively. If the control circuit detects that it has not received a response signal from the motherboard within the first communication duration, but has received a response signal from the display panel within the second communication duration, it controls the light valve to reset, and after controlling the light valve to reset, it controls the light valve power supply circuit to stop supplying power to the light valve. If the control circuit detects that it has not received a response signal from the display panel within the second communication period, it controls the light valve power supply circuit to stop supplying power to the light valve.

10. The method according to claim 9, characterized in that, The control of resetting the optical valve includes: The control circuit sends a reset command to the display panel; The display panel responds to the reset command and controls the light valve to reset.

11. The method according to claim 9, characterized in that, The control circuit for stopping power supply to the optical valve includes: The control circuit sends a first control signal to the power supply control circuit, wherein when the display panel is in a frozen state, the first control signal is an invalid level; The display panel sends an enable signal to the power supply control circuit; wherein, when the display panel is in a power-off state, the enable signal is at an invalid level; Under the control of the first control signal and the enable signal, the power supply control circuit controls the optical valve power supply circuit to stop supplying power to the optical valve.

12. The method according to any one of claims 9 to 11, characterized in that, The method further includes: If the control circuit detects that it has not received a response signal from the motherboard within the first communication duration, it controls the motherboard to restart. If the control circuit detects that it has not received a response signal from the display panel within the second communication period, it controls the display panel to restart.

13. A control method for a projection device, characterized in that, Applied to any one of the projection devices as described in claims 1-8, the method comprises: If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display panel respectively. If the control circuit detects that it has not received a response signal from the motherboard within the first communication period, but has received a response signal from the display panel within the second communication period, it controls the motherboard to restart and does not adjust the operating state of the display panel.

14. The method according to claim 13, characterized in that, Before controlling the motherboard to restart, the method further includes: The control circuit sends a prompt command to the display panel; In response to the prompt command, the display panel displays a prompt message on the projection screen and sends a prompt confirmation message to the control circuit. The prompt message is used to indicate that the motherboard is restarting. Upon receiving the confirmation message, the control circuit controls the motherboard to restart.

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