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. A mainboard of the projection device is used for sending a video image signal to a display panel; the display panel is used for generating a light valve control signal according to the video image signal; a light valve receives a light beam emitted by a light source and modulates the light beam under the control of the light valve control signal; and a control circuit is connected with the mainboard and the display panel. The control circuit is used for controlling the light valve to reset and then restart if a forced shutdown operation is detected, or keeping the running state of the display panel and not restarting the light valve.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to two Chinese patent applications filed on November 10, 2020, entitled "Projection Device and Control Method Thereof," and "Projection Device and Control Method Thereof," the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of projection display, and in particular to a projection device and its control method. Background Technology

[0004] 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.

[0005] 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.

[0006] 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 delicate components in the projection device, such as the light valve. Summary of the Invention

[0007] This application discloses a projection device, which adopts the following technical solution:

[0008] A projection device includes: a motherboard, a display board, a light valve, a light source, a projection lens, a control circuit, and a power supply circuit for the light valve connected to the light valve;

[0009] The motherboard is connected to the display panel, and the motherboard is used to send image signals to the display panel;

[0010] 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.

[0011] The projection lens is configured to project the light beam to form an image.

[0012] The control circuit is connected with the main board, the display board and the light valve power supply circuit respectively, and is configured to:

[0013] If a forced shutdown operation is detected, it is detected whether the main board and the display board are in a dead state respectively;

[0014] If it is detected that the main board is in a dead state and the display board is not in a dead 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.

[0015] If it is detected that the display board is in a dead state, the light valve power supply circuit is controlled to stop supplying power to the light valve.

[0016] In addition, a projection device is disclosed, comprising a main board, a display board, a light valve, a light source, a projection lens and a control circuit.

[0017] The main board is connected with the display board, and is configured to send an image signal to the display board.

[0018] The display board is further connected with the light valve, and is configured 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 a light beam emitted by the light source to the projection lens.

[0019] The projection lens is configured to project the light beam to form an image.

[0020] The control circuit is connected with the main board and the display board respectively, and is configured to:

[0021] If a forced shutdown operation is detected, it is detected whether the main board and the display board are in a dead state respectively;

[0022] If it is detected that the main board is in a dead state and the display board is not in a dead state, the main board is controlled to restart, and the running state of the display board is not adjusted.

[0023] In addition, a control method of a projection device is disclosed, which is applied to a projection device, and the projection device comprises a control circuit, a main board, a display board, a light valve and a light valve power supply circuit. The control circuit is connected with the main board, the display board and the light valve power supply circuit respectively, and the light valve power supply circuit is further connected with the light valve. The method comprises the following steps.

[0024] The control circuit sends a detection signal to the main board and the display board respectively if a forced shutdown operation is detected.

[0025] If the control circuit detects that the response signal sent by the main board is not received within the first communication duration and the response signal sent by the display board is received within the second communication duration, the control circuit controls the light valve to reset and controls the light valve power supply circuit to stop supplying power to the light valve after the light valve is controlled to reset.

[0026] If the control circuit detects that the response signal sent by the display board is not received within the second communication duration, the control circuit controls the light valve power supply circuit to stop supplying power to the light valve.

[0027] Also disclosed is a control method of a projection device, applied to a projection device, the projection device comprising a control circuit, a main board and a display board, the control circuit being connected to the main board and the display board respectively, the method comprising:

[0028] If the control circuit detects a forced shutdown operation, the control circuit sends a detection signal to the main board and the display board respectively.

[0029] If the control circuit detects that the response signal sent by the main board is not received within the first communication duration and the response signal sent by the display board is received within the second communication duration, the control circuit controls the main board to restart and does not adjust the running state of the display board. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0031] Figure 1 is a structural schematic diagram of a projection device provided by an embodiment of the present disclosure;

[0032] Figure 2 is a structural schematic diagram of another projection device provided by an embodiment of the present disclosure;

[0033] Figure 3 is a structural schematic diagram of still another projection device provided by an embodiment of the present disclosure;

[0034] Figure 4 is a structural schematic diagram of still another projection device provided by an embodiment of the present disclosure;

[0035] Figure 5 is a structural schematic diagram of still another projection device provided by an embodiment of the present disclosure;

[0036] Figure 6is a structural schematic diagram of still another projection device provided by an embodiment of the present disclosure;

[0037] Figure 7-1 is a structural schematic diagram of still another projection device provided by an embodiment of the present disclosure;

[0038] Figure 7-2 is a structural schematic diagram of still another projection device provided by an embodiment of the present disclosure;

[0039] Figure 8 is a structural schematic diagram of a projection device provided by the related art;

[0040] Figure 9 is a structural schematic diagram of still another projection device provided by an embodiment of the present disclosure;

[0041] Figure 10 is a flowchart of a control method of a projection device provided by an embodiment of the present disclosure;

[0042] Figure 11 is a flowchart of a control method of another projection device provided by an embodiment of the present disclosure;

[0043] Figure 12 is a flowchart of a control method of still another projection device provided by an embodiment of the present disclosure;

[0044] Figure 13 is a flowchart of a control method of still another projection device provided by an embodiment of the present disclosure;

[0045] Figure 14 is a flowchart of a control method of still another projection device provided by an embodiment of the present disclosure;

[0046] Figure 15 is a flowchart of a control method of still another projection device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0047] For the purpose, technical solutions and advantages of the present disclosure to be clearer, the embodiments of the present disclosure will be described in further detail below with reference to the drawings.

[0048] Figure 1 is a structural schematic diagram of a projection device provided by an embodiment of the present disclosure. As Figure 1As shown, the projection device can include a main board 10, a display board 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 with the light valve 30. In an embodiment, the light valve 30 can include a plurality of digital micro-mirror devices (DMD) arranged in an array. The light source 40 can be a laser, for example, a blue laser, a red laser, or a green laser. The light source 40 is configured to emit a laser beam. The control circuit 60 can be a micro controller unit (MCU).

[0049] The main board 10 is connected with the display board 20, and the main board 10 is configured to send an image signal to the display board 20.

[0050] In an embodiment, the control circuit 60 can be connected with the display board 20 through an inter integrated circuit (I2C) bus, and the main board 10 can send the image signal to the display board 20 through the I2C bus.

[0051] The display board 20 is also connected with the light valve 30, and the display board 20 is configured to generate a light valve control signal according to 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.

[0052] In an embodiment, the display board 20 can generate the light valve control signal according to 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 irradiated to the surface of the light valve 30 by the light source 40 to the projection lens 50.

[0053] The projection lens 50 is configured to project the light beam to form an image. The projection lens 50 is configured to project the light beam to a projection screen, thereby achieving displaying the image on the projection screen.

[0054] The control circuit 60 is connected with the mainboard 10, the display panel 20 and the light valve power supply circuit 70 respectively, and is configured to detect whether the mainboard 10 and the display panel 20 are in a dead state respectively if a forced shutdown operation is detected. If it is detected that the mainboard 10 is in a dead state and the display panel 20 is not in a dead state, the control circuit 60 controls the light valve 30 to reset, and controls the light valve power supply circuit 70 to stop supplying power to the light valve 30 after the light valve 30 is reset. If it is detected that the display panel 20 is in a dead state, the control circuit 60 controls the light valve power supply circuit 70 to stop supplying power to the light valve 30, so as to completely release the electric charge in the light valve 30. The electric charge stored in the light valve 30 is prevented from driving the light valve 30 to deflect by a large angle, i.e., the plurality of digital micromirror devices included in the light valve 30 deflect by a large angle, thereby causing any two adjacent digital micromirror devices to collide, and thus causing some digital micromirror devices to be damaged.

[0055] In the embodiments of the present disclosure, the mainboard 10 can include a system of chip (SoC), and a plurality of application programs can be installed in the SoC. In the process of projecting an image by the projection device, the mainboard 10 can be dead if the number of application programs running in the SoC is large. The digital light processing (DLP) chip included in the display panel 20 can also be dead during running, thereby causing the display panel 20 to be dead.

[0056] Reference Figure 2 A target button 00 can be provided on a remote controller for controlling the projection device, and / or the target button 00 can be provided on a shell of the projection device. 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 controller. In an embodiment, the target button 00 can be a shutdown button, or the target button 00 can be a plurality of buttons, and the forced shutdown operation can be a combined pressing operation on the plurality of buttons.

[0057] If the target button 00 is a shutdown button, the control circuit 60 can detect whether the duration of the pressing operation of the user on the target button 00 is greater than a target duration after detecting the pressing operation. If it is detected that the duration of the pressing operation is less than or equal to the target duration, the control circuit 60 can determine that a shutdown operation is detected, and the control circuit 60 can control the mainboard 10 to perform a normal shutdown process, i.e., the control circuit 60 can control the mainboard 10 to turn off some devices in the mainboard 10 and other devices in the projection device.

[0058] In an embodiment, the control circuit 60 can be provided with a first general purpose input / output (GPIO) GPIO_1 port. If the control circuit 60 detects an invalid level signal at the first GPIO_1 port, the control circuit 60 can determine that a pressing operation of the target button 00 by a user is detected. If the control circuit 60 detects a valid level signal at the first GPIO_1 port, the control circuit 60 can determine that a pressing operation of the target button 00 by a user is not detected. Here, the invalid level can be a low level, and the valid level can be a high level; or the invalid level can be a high level, and the valid level can be a low level.

[0059] For example, if the invalid level is a low level, the voltage of the signal detected by the control circuit 60 at the first GPIO_1 port is less than 0.7 volts (V).

[0060] The control circuit 60 is also provided with a second GPIO_2 port. After detecting a shutdown operation, the control circuit 60 can output an invalid level signal through the second GPIO_2 port, and then the main board 10 can perform a normal shutdown process after receiving the invalid level signal.

[0061] If the control circuit 60 detects that the duration of the pressing operation is greater than a target duration, the control circuit 60 can determine that a forced shutdown operation is detected. At this time, the control circuit 60 can detect whether the main board 10 and the display board 20 are in a dead state, respectively. Here, the target duration is a fixed duration stored in the control circuit 60 in advance.

[0062] In summary, the embodiments of the present disclosure provide a projection device. When the control circuit in the projection device determines that the main board is in a dead state and the display board is not in a dead state, the control circuit 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 it is determined that the display board is in a dead state, the light valve power supply circuit can be controlled to stop supplying power to the light valve. In this way, the situation that the light valve in the projection device is damaged due to the user directly unplugging the power supply to restart the projection device can be avoided, thereby prolonging the service life of the projection device.

[0063] In the embodiments of the present disclosure, in the process of detecting whether the main board 10 and the display board 20 are in the dead state respectively, the control circuit 60 can send a detection message to the main board 10 and the display board 20 respectively. If the control circuit 60 receives the response message sent by the main board 10 within the first communication duration, the control circuit 60 can determine that the main board 10 is not in the dead state. If the control circuit 60 does not receive the response message sent by the main board 10 within the first communication duration, the control circuit 60 can determine that the main board 10 is in the dead state. The first communication duration can be a fixed duration stored in the control circuit 60 in advance.

[0064] If the control circuit 60 receives the response message sent by the display board 20 within the second communication duration, the control circuit 60 can determine that the display board 20 is not in the dead state. If the control circuit 60 does not receive the response message sent by the display board 20 within the second communication duration, the control circuit 60 can determine that the display board 20 is in the dead state. The second communication duration can be a fixed duration stored in the control circuit 60 in advance.

[0065] In an implementation, the control circuit 60 can be connected with the main board 10 and the display board 20 through I2C respectively, and the control circuit 60 can send the detection message to the main board 10 and the display board 20 through the I2C, and the main board 10 and the display board 20 can send the response message to the control circuit 60 through the I2C.

[0066] In the embodiments of the present disclosure, if the control circuit 60 detects that the main board 10 is in the dead state and the display board 20 is not in the dead state, the control circuit 60 can send a reset instruction to the display board 20. The display board 20 can control the light valve 30 to reset in response to the reset instruction.

[0067] Reference Figure 3 The light valve 30 includes a plurality of digital micromirror devices arranged in an array, and the distance between any two adjacent digital micromirror devices in the plurality of digital micromirror devices is small. In the process of starting the projection device, the display board 20 is further configured 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 an initial position to a target position. Then, in the process of displaying an image by the projection device, the display board 20 controls the light valve 30 to deflect from the target position as a starting position through the light valve control signal Ct, and the deflected light valve 30 is used to transmit the light beam transmitted by the light source 40 to the projection lens 50.

[0068] In the process of resetting 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 to the initial position. Then 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 the stored charge completely.

[0069] If the display panel 20 does not control the light valve 30 to reset before the display panel 20 is powered off, 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 is not deflected to the initial position, and the stored charge in the light valve 30 is not released completely. The stored charge in the light valve 30 will drive the light valve 30 to deflect at a large angle, that is, the plurality of 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, thereby causing damage to part of the digital micromirror devices.

[0070] In the embodiment of the present disclosure, if the control circuit 60 detects that the main board 10 is in a dead state and the display panel 20 is not in a dead state, a reset instruction is sent to the display panel 20, so that the light valve 30 is controlled to reset before the display panel 20 is powered off, and the light valve power supply circuit 70 is controlled to stop supplying power to the light valve 30. Thus, the situation that the light valve 30 is not reset after the display panel 20 is powered off or the stored charge in the light valve 30 is not released completely, which causes damage to the light valve 30, is avoided, and the reliability of the control of the light valve 30 is ensured.

[0071] Reference Figure 4 The light valve power supply circuit 70 can include a first switching sub-circuit U1, a second switching sub-circuit U2, a third switching sub-circuit U3, a fourth switching sub-circuit U4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first power supply end Vc, a second power supply end Vo, a third power supply end Vb, a fourth power supply end Vr, a fifth power supply end G1, a sixth power supply end G2, a seventh power supply end G3, and an eighth power supply end G4.

[0072] The control end of the first switching sub-circuit U1 is connected with the display panel 20, the input end of the first switching sub-circuit U1 is connected with one end of the first resistor R1, the control end of the second switching sub-circuit U2, the control end of the third switching sub-circuit U3, and the control end of the fourth switching sub-circuit U4 respectively. The output end of the first switching sub-circuit U1 is connected with the fifth power supply end G1, and the other end of the first resistor R1 is connected with the first power supply end Vc.

[0073] The input end of the second switch sub-circuit U2 is connected with one end of the second resistor R2, the output end of the second switch sub-circuit U2 is connected with the seventh power supply end G2, the other end of the second resistor R2 is connected with one end of the second power supply end Vo, and the other end of the second power supply end Vo is connected with the light valve 30.

[0074] The input end of the third switch sub-circuit U3 is connected with one end of the third resistor R3, the output end of the third switch sub-circuit U3 is connected with the seventh power supply end G3, the other end of the third resistor R3 is connected with one end of the third power supply end Vb, and the other end of the third power supply end Vb is connected with the light valve 30.

[0075] The input end of the fourth switch sub-circuit U4 is connected with one end of the fourth resistor R4, the output end of the fourth switch sub-circuit U4 is connected with the eighth power supply end G4, the other end of the fourth resistor R4 is connected with one end of the fourth power supply end Vr, and the other end of the fourth power supply end Vr is connected with the light valve 30.

[0076] In an embodiment, the first power supply end Vc, the second power supply end Vo, the third power supply end Vb and the fourth power supply end Vr can all be direct current power supply ends, and the fifth power supply end G1, the sixth power supply end G2, the seventh power supply end G3 and the eighth power supply end G4 can all be ground ends (GND).

[0077] Reference Figure 3 and Figure 4 In the process of projecting and displaying an image by the projection device, the display panel 20 outputs an enable signal EN to the light valve power supply circuit 70, and the first switch sub-circuit U1 is turned on when the enable signal is at a valid level. At this time, the power supply signal provided by the first power supply end Vc is transmitted to the fifth power supply end G1 through the first switch sub-circuit U1 after passing through the first resistor R1. The other part of the signal is transmitted to the control end of the second switch sub-circuit U2, the control end of the third switch sub-circuit U3 and the control end of the fourth switch sub-circuit U4 to transmit the power supply signal.

[0078] Since the voltage of the 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 turned off under the control of the 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 turned on, and the second power supply end Vo, the third power supply end Vb and the fourth power supply end Vr respectively transmit the power supply signal to the light valve 30, so as to realize the power supply to the light valve 30. At the same time, the display panel 20 transmits a light valve control signal Ct to the light valve 30 to realize the deflection control of the light valve 30.

[0079] The voltage of the power signal transmitted from the second power supply terminal Vo to the light valve 30 can be V1, the voltage of the power signal transmitted from the third power supply terminal Vb to the light valve 30 can be V2, and the voltage of the power signal transmitted from the fourth power supply terminal Vr to the light valve 30 can be V3.

[0080] In the process of controlling the light valve 30 to reset, the display panel 20 transmits a second target control signal to the light valve 30, and the light valve 30 returns to the initial position under the control of the second target control signal. Then, in the process of 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 switching sub-circuit U1, and at this time, the first switching sub-circuit U1 is disconnected. The power signal transmitted from the first power supply terminal Vc is transmitted to the control terminal of the second switching sub-circuit U2, the control terminal of the third switching sub-circuit U3, and the control terminal of the fourth switching sub-circuit U4 after passing through the first resistor R1.

[0081] Since the first switching sub-circuit U1 is disconnected, the first switching sub-circuit U1 does not divide the voltage, and thus the voltage of the power signal transmitted to the second switching sub-circuit U2, the third switching sub-circuit U3, and the fourth switching sub-circuit U4 is high, and the second switching sub-circuit U2, the third switching sub-circuit U3, and the fourth switching sub-circuit U4 are turned on under the control of the power signal. At this time, the charges stored in the light valve 30 and the power signal provided by the second power supply terminal Vo are transmitted to the sixth power supply terminal G2 through the second resistor R2 and the second switching sub-circuit U2. The charges stored in the light valve 30 and the power signal provided by the third power supply terminal Vb are transmitted to the seventh power supply terminal G3 through the third resistor R3 and the third switching sub-circuit U3. The charges stored in the light valve 30 and the power signal provided by the fourth power supply terminal Vr are transmitted to the eighth power supply terminal G4 through the fourth resistor R4 and the fourth switching sub-circuit U4, thereby achieving the rapid release of the charges stored in the light valve 30.

[0082] Reference Figure 5 The projection device can further include a power supply control circuit N1, a first input terminal of the power supply control circuit N1 being connected with the control circuit 60, a second input terminal of the power supply control circuit N1 being connected with the display panel 20, and an output terminal of the power supply control circuit N1 being connected with the light valve power supply circuit 70. In an embodiment, the power supply control circuit N1 can be a logic AND device.

[0083] The control circuit 60 is further configured to send a first control signal to the power supply control circuit N1. The display panel 20 is further configured to send an enable signal EN to the power supply control circuit N1, the enable signal EN being at an effective level when the display panel 20 is in a power-on state, and the enable signal EN being at an invalid level when the display panel 20 is in a power-off state.

[0084] In an embodiment, the control circuit 60 is further provided with a third GPIO_3 port, and the control circuit 60 can send a first control signal to the power supply control circuit N1 through the third GPIO_3 port.

[0085] The power supply control circuit N1 is configured 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 configured 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 a valid level.

[0086] The first control signal is at an invalid level when the display panel 20 is in a dead state. The first control signal is at an invalid level when the main board 10 is in a dead state and the display panel 20 is not in a dead state.

[0087] In the embodiments of the present disclosure, the control circuit 60 is further configured to control the circuit board in a dead state of the main board 10 and / or the display panel 20 to restart if it is detected that the main board 10 and / or the display panel 20 is in a dead state.

[0088] Reference Figure 5 The projection device can further include a first switch SW1, a second switch SW2, and a power panel 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 panel 80, and the output terminal of the first switch SW1 is connected to the main board 10.

[0089] 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 panel 80, and the output terminal of the second switch SW2 is connected to the display panel 20.

[0090] Reference Figure 5 The control terminal of the second switch SW2 is connected to the main board 10. Alternatively, reference Figure 6 The control terminal of the second switch SW2 is connected to the control circuit 60. Alternatively, reference Figure 7-1 The control terminal of the second switch SW2 is connected to the control circuit 60 and the main board 10.

[0091] The control circuit 60 is configured to control the first switch SW1 to be open if it is detected that the main board 10 is in a dead state, and to control the first switch SW1 to be closed after a first time length after the first switch SW1 is opened. The first time length is a fixed time length pre-stored in the control circuit 60.

[0092] In the embodiments of the present disclosure, after the control circuit 60 controls the first switch SW1 to be open, the power board 80 stops providing the power signal to the main board 10, so that the main board 10 is in a power-off state. After the control circuit 60 controls the first switch SW1 to be closed, the power board 80 can provide the power signal to the main board 10, so that the main board 10 is in a power-on state. The control circuit 60 controls the first switch SW1 to be open first, and then controls the first switch SW1 to be closed, so as to control the main board 10 to be in the power-off state first, and then control the main board 10 to be in the power-on state, thereby realizing the restart of the main board 10.

[0093] The control circuit 60 is configured to control the second switch SW2 to be open if it is detected that the display board 20 is in the dead state, and control the second switch SW2 to be closed after the second switch SW2 is open for a second time length. The second time length is a fixed time length pre-stored in the control circuit 60.

[0094] In the embodiments of the present disclosure, after the control circuit 60 controls the second switch SW2 to be open, the power board 80 stops providing the power signal to the display board 20, so that the display board 20 is in a power-off state. After the control circuit 60 controls the second switch SW2 to be closed, the power board 80 can provide the power signal to the display board 20, so that the display board 20 is in a power-on state. The control circuit 60 controls the second switch SW2 to be open first, and then controls the second switch SW2 to be closed, so as to control the display board 20 to be in the power-off state first, and then control the display board 20 to be in the power-on state, thereby realizing the restart of the display board 20.

[0095] In the embodiments of the present disclosure, when the main board 10 is in the dead state and the display board 20 is not in the dead state, the control circuit 60 can control the main board 10 and the display board 20 to restart respectively, or can only control the main board 10 to restart.

[0096] If the control circuit 60 controls the main board 10 and the display board 20 to restart respectively, the control circuit 60 is further configured to send a reset instruction to the display board 20 if it is detected that the main board 10 is in the dead state and the display board 20 is not in the dead state. The display board 20 can control the light valve 30 to reset in response to the reset instruction. After the display board 20 controls the light valve 30 to reset, the display board 20 sends reset confirmation information to the control circuit 60. The control circuit 60 is configured to control the light valve power supply circuit 70 to stop supplying power to the light valve 30 after receiving the reset confirmation information. Then, the control circuit 60 controls the first switch SW1 to be open, and controls the first switch SW1 to be closed after the first switch SW1 is open for a first time length.

[0097] In an embodiment, the display board 20 is provided with a fourth GPIO_4 port, and the display board 20 can send the reset confirmation information to the control circuit 60 through the fourth GPIO_4 port.

[0098] 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 one implementation method in an embodiment of this disclosure, see reference. 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.

[0099] 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.

[0100] 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.

[0101] 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 another implementation method in an embodiment of this disclosure, see reference [link to relevant documentation]. Figure 7-1 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. In one embodiment, reference... Figure 7-1 The switch control circuit N2 can be a logic OR device.

[0102] The control circuit 60 is also configured to send a second control signal to the switch control circuit N2, and the main board 10 is configured to send a third control signal to the switch control circuit N2. The switch control circuit N2 is configured to control the second switch SW2 to be closed 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. The switch control circuit N2 is configured to control the second switch SW2 to be opened if the second control signal and the third control signal are both detected to be at an invalid level.

[0103] In an embodiment, the control circuit 60 sends the second control signal to the switch control circuit N2 at an invalid level after the control circuit 60 controls the light valve power supply circuit 70 to stop supplying power to the light valve 30. The main board 10 sends the third control signal to the switch control circuit N2 at an invalid level when the main board 10 is in the dead state and the power-off state.

[0104] In the embodiment of the present disclosure, after the control circuit 60 controls the light valve power supply circuit 70 to stop supplying power to the light valve 30 and sends the second control signal to the switch control circuit N2 at an invalid level, the control circuit 60 can first control the main board 10 to be in the power-off state, and then control the display board 20 to be in the power-off state. Subsequently, the control circuit 60 can control the main board 10 and the display board 20 to be in the power-on state.

[0105] Since the third control signal is at an invalid level and the second control signal is at an invalid level when the main board 10 is in the power-off state, the switch control circuit N2 can control the second switch SW2 to be opened, and at this time, the display board 20 is also in the power-off state.

[0106] The embodiment of the present disclosure does not limit the order in which the control circuit 60 controls the main board 10 and the display board 20 to be in the power-on state. For example, the control circuit 60 can first control the main board 10 to be in the power-on state, and then control the display board 20 to be in the power-on state. In an embodiment, the control circuit 60 can first control the first switch SW1 to be closed to control the main board 10 to be in the power-on state. Subsequently, the control circuit 60 can send a switch closing instruction to the main board 10 and / or the control circuit 60 sends a first switch signal to the first switch, the first switch signal being at a valid level or an invalid level. The main board 10 can send the third control signal at a valid level to the switch control circuit N2 in response to the switch closing instruction, so that the switch control circuit N2 controls the second switch SW2 to be closed, thereby realizing that the display board 20 is in the power-on state.

[0107] Alternatively, the control circuit 60 first powers on the display panel 20, and then powers on the main board 10. In one embodiment, 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 60 can control the first switch SW1 to close, thus powering on the main board 10.

[0108] Alternatively, the control circuit 60 can simultaneously power on both the motherboard 10 and the display panel 20. In one embodiment, 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.

[0109] In one implementation, the control circuit 60 is also 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 can 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.

[0110] refer to Figure 7-1 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.

[0111] as well as, Figure 7-2 A structural diagram of yet another projection device is provided.

[0112] and Figure 7-1 The example differs in that, see [link to example]. Figure 7-2 In this projection device, the light valve power supply circuit 70 only receives the EN enable control signal from the display panel 20.

[0113] And, with Figure 7-1 The difference is that the illustrations are different. Figure 7-2 In the example, the control circuit 60 can send a second control signal at an active level to the switch control circuit N2 during the process of controlling only the motherboard 10 to restart. This ensures that when the motherboard 10 is in a power-off state, the switch control circuit N2 can control the second switch SW2 to close, thereby ensuring that the display panel 20 is in a power-on state. The display panel 20 is also used to display a prompt message on the projection screen in the aforementioned power-on state, which indicates that the motherboard 10 is restarting.

[0114] Furthermore, the display panel 20, while displaying the prompt information, also sends confirmation information to the control circuit 60. Upon receiving the confirmation information, the control circuit 60 controls the motherboard 10 to restart. By controlling the display panel 20 to display the prompt information on the projection screen, the user is informed that the motherboard 10 is currently restarting, preventing the user from unplugging the power supply during the restart process and thus ensuring the reliability of the projection device control.

[0115] In one implementation, the 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 control circuit 60 via I2C.

[0116] In this embodiment, after the control circuit 60 restarts the mainboard 10, the mainboard 10 can send a video image signal to the display board 20 so that the display board 20 displays the projected image instead of displaying the prompt information.

[0117] Therefore, in the above Figure 7-2 In the embodiment shown, when the control circuit 60 receives an external forced shutdown operation command, it may not send a reset signal to the display panel 20. Instead, it can use the control signal to ensure that the display panel 20 has a normal power supply state and will not lose power due to the power failure of the main board 10. This also avoids the sudden power failure of the light valve 30 and ensures the reliability of the light valve 30.

[0118] In the above example, for a scenario 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 one implementation method, see [reference]. Figure 7-1 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.

[0119] Subsequently, after the second switch SW2 has been open for a second period, the control circuit 60 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 60 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.

[0120] In the scenario where the control circuit 60 detects that the display panel 20 is in a frozen state, but the motherboard 10 is not in a frozen state, and the control circuit 60 only controls the display panel 20 to restart, as another implementation method in one embodiment, 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 60 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.

[0121] 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. In one embodiment, the control circuit 60 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.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] In one implementation, refer to Figure 5 and Figure 7-1 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.

[0126] 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.

[0127] Alternatively, the control circuit 60 may also output a control signal for controlling the power supply of the display panel 20. When the control circuit 60 is powering off and on the main board 10, the control signal maintains the normal power supply of the display panel 20, so that the display panel 20 is not affected by the power on and off of the main board 10, and the light valve will not suddenly lose power, thus ensuring the reliable operation of the light valve.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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 control circuit can control the light valve power supply circuit to stop supplying power to the light valve. Alternatively, the control circuit can also output a control signal for controlling the power supply to the display panel. When the control circuit is powering off and on the motherboard, this control signal maintains the normal power supply to the display panel, so that the display panel is not affected by the power on and off of the motherboard, and thus the light valve will not suddenly lose power, ensuring the reliable operation of the light valve. The above technical means can avoid the situation where the user directly unplugs the power to restart the projection device, causing damage to the light valve in the projection device, thus ensuring the reliability of the operation of the projection device.

[0132] In summary, the embodiments of this disclosure provide a projection device. 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.

[0133] Alternatively, if the motherboard crashes but the display board does not, only the motherboard can be restarted while maintaining power to the display board. This avoids a sudden power outage of the light valve, thus preventing damage to the light valve caused by the user directly unplugging the power supply to restart the projector and extending the lifespan of the projector.

[0134] 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.

[0135] 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;

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] refer to Figure 7-1During 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.

[0141] In one implementation, 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.

[0142] 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.

[0143] 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.

[0144] Furthermore, embodiments of this disclosure also provide a projection device in which the control circuit, upon detecting a forced shutdown operation, determines that the mainboard is in a frozen state. It maintains the power supply to the display panel and displays a notification that the mainboard is restarting. Upon receiving confirmation from the display panel, the main control circuit powers off and restarts the mainboard. This avoids damage to components caused by users directly unplugging the power supply to restart the projection device. In the above embodiment, the display panel is not powered off, thus preventing sudden power outages to the light valve and ensuring the reliability of the projection device operation.

[0145] 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 , Figure 5 to Figure 7-1 In any of the projection devices shown, such as Figure 10 As shown, the method may include:

[0146] Step 1001: If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display board respectively.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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 , Figure 5 to Figure 7-1 In the projection device shown. For example... Figure 11 As shown, the method may include:

[0151] Step 1101: If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display board respectively.

[0152] 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.

[0153] Step 1103: The display panel responds to the reset command and controls the light valve to reset.

[0154] Step 1104: The control circuit sends a first control signal at an invalid level to the power supply control circuit.

[0155] Step 1105: The display board sends an enable signal at an active level to the power supply control circuit.

[0156] 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.

[0157] Step 1107: The control circuit controls the motherboard to restart.

[0158] The implementation process of steps 1101 to 1107 above can be referred to the above device embodiment, and will not be repeated here.

[0159] 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.

[0160] 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 , Figure 5 to Figure 7-1 In any of the projection devices shown. For example... Figure 12 As shown, the method may include:

[0161] Step 1201: If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display board respectively.

[0162] 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.

[0163] Step 1203: The display board sends an enable signal at an active level to the power supply control circuit.

[0164] 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.

[0165] 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.

[0166] In one embodiment, 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.

[0167] Step 1205: The control circuit restarts the display board.

[0168] The implementation process of steps 1201 to 1205 above can be referred to the above device embodiment, and will not be repeated here.

[0169] 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.

[0170] 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 7-1 In the projection device shown. For example... Figure 13 As shown, the method may include:

[0171] Step 1301: If the control circuit detects a forced shutdown operation, it sends detection signals to the motherboard and the display board respectively.

[0172] 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.

[0173] The implementation process of steps 1301 to 1302 above can be referred to the above device embodiment, and will not be repeated here.

[0174] 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.

[0175] Figure 14This is a flowchart of another control method for a projection device provided in this disclosure embodiment, which can be applied to... Figure 7-1 In the projection device shown. For example... Figure 14 As shown, the method may include:

[0176] 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.

[0177] 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.

[0178] 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.

[0179] This message indicates that the motherboard is restarting.

[0180] Step 1404: After receiving the confirmation message, the control circuit controls the motherboard to restart.

[0181] The implementation process of steps 1401 to 1404 above can be referred to the above device embodiment, and will not be repeated here.

[0182] 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.

[0183] as well as, Figure 15 This is a flowchart illustrating another control method for a projection device provided in this application embodiment. This method can be applied to... Figure 7-1 or Figure 7-2 In the projection device shown. For example... Figure 15 As shown, the method may include:

[0184] Step 1501: If the control circuit detects a forced shutdown operation, it checks whether the motherboard is in a frozen state.

[0185] Step 1502: If the control circuit detects that the motherboard is in a frozen state, it sends a prompt command to the display board and controls the display board to be powered on.

[0186] Specifically, such as Figure 7-1In the process, the control circuit outputs a control signal to the second switch SW1, so that the second switch SW1 is in an effective state of connecting the power board, thereby ensuring that the display board is powered on.

[0187] Or such as Figure 7-2 In this circuit, the control signal output by the control circuit is ORed with the control signal output by the motherboard to serve as the switch control signal for powering the display panel. Specifically, the control terminal of the second switch SW2 is connected to both the control circuit and 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 panel.

[0188] Step 1503: 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.

[0189] This message indicates that the motherboard is restarting.

[0190] Step 1504: After receiving the confirmation message, the control circuit disconnects the power supply to the motherboard.

[0191] Furthermore, the above methods may also include:

[0192] Step 1505: After disconnecting the motherboard power supply for a preset time, restore the motherboard power supply.

[0193] This disclosure provides 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, it maintains the power supply to the display panel and prompts the mainboard to restart. Upon receiving confirmation from the display panel, the main control circuit powers off and restarts the mainboard. This avoids damage to components in the projection device caused by the user directly unplugging the power supply to restart it. Furthermore, in the above embodiment, the display panel is not powered off, thus preventing sudden power outages to the light valve and ensuring the reliability of the projection device operation.

[0194] 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 1403 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.

[0195] This disclosure provides a laser 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.,...). Figure 10 to Figure 15 The steps performed by the control circuit in any of the embodiments shown.

[0196] This disclosure provides a computer-readable storage medium storing instructions that, when executed by a processor, implement the method embodiments described above (e.g., ...). Figure 10 to Figure 15 The steps performed by the control circuit in any of the embodiments shown.

[0197] This disclosure provides a computer program product containing instructions that, when executed on a computer, cause the computer to perform the methods described in the above-described aspects (e.g., Figure 10 to Figure 15 The steps performed by the control circuit in any of the embodiments shown.

[0198] 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.

[0199] 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, and a power supply circuit for the light valve connected to the light valve; the light valve includes multiple digital micromirror devices arranged in an array. 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 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. The projection lens is used to project the light beam into an image; 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: 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 so that the light valve can release all the stored charge. 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 so that the light valve can release all the stored charge. Restart circuit boards in the motherboard and display board that are in a frozen state.

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 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 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; wherein, 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.

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 1, characterized in that, 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. 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.

9. A projection device, characterized in that, The projection device includes: a motherboard, a display panel, a light valve, a light source, a projection lens, and a control circuit; the light valve includes multiple digital micromirror devices arranged in an array. 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 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. The projection lens is used to project the light beam into an image; The control circuit is connected to the motherboard and the display panel 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 while the display board is not frozen, the motherboard is controlled to restart without adjusting the operating state of the display board, so that the power supply to the light valve will not be interrupted suddenly, ensuring the reliable operation of the light valve.

10. The projection device according to claim 9, characterized in that, The control circuit is also used to send a prompt 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 also used to respond to the prompting command by displaying prompting information on the projection screen and sending prompting confirmation information to the control circuit, wherein the prompting information is used to indicate that the motherboard is restarting; The control circuit is also used to control the motherboard to restart after receiving the confirmation message.

11. The projection device according to claim 10, characterized in that, The projection device further includes: a power board, a switch control circuit, and a second switch; the first input terminal of the switch control circuit is connected to the control circuit, the second input terminal of the switch control circuit is connected to the motherboard, the output terminal of the switch control circuit is connected to the control terminal of the second switch, 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 panel. 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 an active level, and / or if the third control signal is detected to be at an active level.

12. The projection device according to claim 9, characterized in that, 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.

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