CN112379762A

CN112379762A - Projection apparatus and control method thereof

Info

Publication number: CN112379762A
Application number: CN202011248205.3A
Authority: CN
Inventors: 吴超; 赵一石; 陈许
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-02-19

Abstract

The application discloses a projection device and a control method thereof, and belongs to the field of projection display. When the control circuit in the projection device determines that the main board is in the dead halt state and the display panel is not in the dead halt state, the control circuit can firstly control the light valve to reset and then control the light valve power supply circuit to stop supplying power to the light valve. And the control circuit can control the light valve power supply circuit to stop supplying power to the light valve when the display panel is determined to be in the dead halt state. Therefore, the situation that the light valve in the projection equipment is damaged due to the fact that the user directly pulls out the power supply to restart the projection equipment can be avoided.

Description

Projection apparatus and control method thereof

Technical Field

The present disclosure relates to the field of projection display, and in particular, to a projection apparatus and a control method thereof.

Background

The projection device may include a power board to which the motherboard is connected. The power strip may provide power to the motherboard and other components in the projection device. The mainboard can respond to a shutdown instruction and control the power panel to stop supplying power to partial devices in the mainboard and other devices in the projection equipment, so that the projection equipment is shut down, and then the mainboard can respond to the startup instruction and control the power panel to supply power to all devices in the projection equipment, so that the projection equipment is restarted.

In the related art, when the motherboard crashes, it cannot detect or respond to the shutdown command. At this time, the user can only unplug the power supply of the projection device, and restart the projection device after the power supply is plugged again for the projection device, so as to restart the main board.

However, after the main board is halted, other devices in the projection apparatus may still be in a working state, and therefore, the user may restart the main board by pulling out the power supply, which may damage the light valve in the projection apparatus.

Disclosure of Invention

The embodiment of the disclosure provides a projection device and a control method thereof, which can solve the problem that in the related art, a user restarts a main board by pulling out a power supply, which may damage a light valve in the projection device. The technical scheme is as follows:

in one aspect, a projection apparatus is provided, the projection apparatus comprising: the projection device comprises a main board, a display panel, a light valve, a light source, a projection lens, a control circuit and a light valve power supply circuit connected with the light valve;

the mainboard is connected with the display panel and is used for sending image signals to the display panel;

the display panel is also connected with the light valve, and is used for generating a light valve control signal according to the image signal and controlling the light valve to turn over 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 for projecting and imaging the light beam;

the control circuit is respectively connected with the mainboard, the display panel and the light valve power supply circuit, and is used for:

if detecting the forced shutdown operation, respectively detecting whether the mainboard and the display panel are in a dead halt state;

if the mainboard is detected to be in a dead halt state and the display panel is not in the dead halt state, the light valve is controlled to reset, and the light valve power supply circuit is controlled to stop supplying power to the light valve after the light valve is controlled to reset;

and if the display panel is detected to be in a dead halt state, controlling the light valve power supply circuit to stop supplying power to the light valve.

In another aspect, a projection apparatus is provided, the projection apparatus comprising: the device comprises a main board, a display board, a light valve, a light source, a projection lens and a control circuit;

the projection lens is used for projecting and imaging the light beam;

the control circuit is respectively connected with the mainboard and the display panel, and the control circuit is used for:

and if the mainboard is detected to be in the dead halt state and the display panel is not in the dead halt state, controlling the mainboard to be restarted and not adjusting the running state of the display panel.

In another aspect, a method for controlling a projection apparatus is provided, where the method is applied to a projection apparatus, and the projection apparatus includes: the control circuit is respectively connected with the mainboard, the display panel and the light valve power supply circuit, and the light valve power supply circuit is also connected with the light valve; the method comprises the following steps:

if the control circuit detects forced shutdown operation, the control circuit respectively sends detection signals to the mainboard and the display panel;

if the control circuit detects that the response signal sent by the mainboard is not received in the first communication time length and the response signal sent by the display panel is received in the second communication time length, 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 controlling the light valve to reset;

and if the control circuit detects that the response signal sent by the display panel is not received within the second communication time length, the control circuit controls the light valve power supply circuit to stop supplying power to the light valve.

In another aspect, a method for controlling a projection apparatus is provided, where the method is applied to a projection apparatus, and the projection apparatus includes: the display device comprises a control circuit, a mainboard and a display panel, wherein the control circuit is respectively connected with the mainboard and the display panel; the method comprises the following steps:

and if the control circuit detects that the response signal sent by the mainboard is not received in the first communication time period and the response signal sent by the display panel is received in the second communication time period, the control circuit controls the mainboard to restart and does not adjust the running state of the display panel.

In yet another aspect, a projection apparatus is provided, including: a memory, a processor and a computer program stored on the memory, the processor implementing the steps performed by the control circuit in the control method of the projection apparatus according to the above aspect when executing the computer program.

In yet another aspect, a computer-readable storage medium is provided, in which instructions are stored, which when executed by a processor, implement the steps performed by the control circuit in the control method of the projection apparatus according to the above aspect.

In yet another aspect, a computer program product containing instructions is provided, which when run on the computer causes the computer to perform the steps performed by the control circuit in the control method of the projection apparatus according to the above aspect.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

the embodiment of the disclosure provides a projection device and a control method thereof, wherein when a control circuit in the projection device determines that a mainboard is in a dead halt state and a display panel is not in the dead halt state, the control circuit can firstly control a light valve to reset and then control a light valve power supply circuit to stop supplying power to the light valve. And the control circuit can control the light valve power supply circuit to stop supplying power to the light valve when the display panel is determined to be in the dead halt state. Therefore, the condition that the light valve in the projection equipment is damaged due to the fact that the user directly pulls out the power supply to restart the projection equipment can be avoided, and the service life of the projection equipment is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of another projection apparatus provided in the embodiments of the present disclosure;

FIG. 3 is a schematic structural diagram of another projection apparatus provided in the embodiments of the present disclosure;

FIG. 4 is a schematic structural diagram of another projection apparatus provided in an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of another projection apparatus provided in the embodiments of the present disclosure;

FIG. 6 is a schematic structural diagram of another projection apparatus provided in the embodiments of the present disclosure;

fig. 7 is a schematic structural diagram of another projection apparatus provided in an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a projection apparatus provided in the related art;

fig. 9 is a schematic structural diagram of another projection apparatus provided in the embodiments of the present disclosure;

fig. 10 is a flowchart of a control method of a projection apparatus according to an embodiment of the disclosure;

fig. 11 is a flowchart of another control method for a projection apparatus according to an embodiment of the disclosure;

fig. 12 is a flowchart of a control method for a projection apparatus according to another embodiment of the disclosure;

fig. 13 is a flowchart of a control method of a projection apparatus according to another embodiment of the disclosure;

fig. 14 is a flowchart of a control method of a projection apparatus according to another embodiment of the disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a projection apparatus provided in an embodiment of the present disclosure. As shown in fig. 1, the projection apparatus may include: the display device comprises a main board 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 with the light valve 30. Alternatively, the light valve 30 may include a plurality of digital micro-mirror devices (DMDs) arranged in an array. The light source 40 may be a laser, which may be, for example, 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 Micro Controller Unit (MCU).

The main board 10 is connected to the display panel 20, and the main board 10 is used to transmit image signals to the display panel 20.

Alternatively, the control circuit 60 and the display panel 20 may be connected via an integrated circuit bus (I2C), and the main board 10 may transmit the image signal to the display panel 20 via the I2C.

The display panel 20 is further connected to the light valve 30, and the display panel 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 from the light source 40 to the projection lens 50.

Alternatively, the display panel 20 may generate a light valve control signal according to the pixel value of the pixel in the image signal, and control the light valve 30 to be turned according to the light valve control signal. The flipped light valve 30 can transmit the light beam irradiated from the light source 40 to the surface thereof to the projection lens 50.

The projection lens 50 is used for projecting and imaging the light beam. The projection lens 50 is used to project the light beam to a projection screen, thereby realizing display of an image on the projection screen.

The control circuit 60 is respectively connected to the motherboard 10, the display panel 20 and the light valve power supply circuit 70, and the control circuit 60 is configured to detect whether the motherboard 10 and the display panel 20 are in a dead halt state if a forced shutdown operation is detected, control the light valve reset 30 if the motherboard 10 is detected in the dead halt state and the display panel 20 is not detected in the dead halt state, and control the light valve power supply circuit 70 to stop supplying power to the light valve 30 after the light valve 30 is reset. If the display panel 20 is detected to be in the dead halt state, the light valve power supply circuit 70 is controlled to stop supplying power to the light valve 30, so as to completely discharge the charges in the light valve 30. The light valve 30 is prevented from being deflected by a large angle driven by the charge stored in the light valve 30, that is, the light valve 30 comprises the plurality of digital micro-mirror devices which are deflected by a large angle, so that any two adjacent digital micro-mirror devices collide with each other, and thus, a part of the digital micro-mirror devices are damaged.

In the embodiment of the present disclosure, the main board 10 may include a system of chip (SoC) in which a plurality of application programs may be installed. During the process of projecting the image by the projection device, if the number of the applications running in the SoC is large, the host 10 may be halted. The Digital Light Processing (DLP) chip included in the display panel 20 may be halted during operation, thereby causing the display panel 20 to be halted.

Referring to fig. 2, a remote controller for controlling the projection apparatus may be provided with a target button 00, and/or a housing of the projection apparatus may be provided with the target button 00. The forced shutdown operation may be a pressing operation for the target button 00 on the projection apparatus, or the forced shutdown operation may be a pressing operation for the target button 00 on a remote controller. Optionally, the target button 00 may be a shutdown button, or the target button 00 may be a plurality of buttons, and the forced shutdown operation may be a combined pressing operation for the plurality of buttons.

Assuming that the target button 00 is a power-off button, the control circuit 60 may detect whether the duration of the pressing operation is longer than a target duration after detecting the pressing operation of the target button 00 by the user. If it is detected that the duration of the pressing operation is less than or equal to the target duration, the control circuit 60 may determine that the shutdown operation is detected, at this time, the control circuit 60 may control the motherboard 10 to execute a normal shutdown procedure, that is, the control circuit 60 may control the motherboard 10 to shut down some devices in the motherboard 10 and other devices in the projection apparatus.

Optionally, the control circuit 60 may be provided with a first general purpose input/output (GPIO) GPIO _1 port. If the signal detected by the control circuit 60 at the first GPIO _1 port is at an inactive level, the control circuit 60 may determine that the pressing operation of the target button 00 by the user is detected. If the signal detected by the control circuit 60 on the first GPIO _1 port is at an active level, the control circuit 60 may determine that the pressing operation of the target button 00 by the user is not detected. The inactive level may be a low level, and the active level may be a high level; alternatively, the inactive level may be high and the active level may be low.

For example, if the disable 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).

The control circuit 60 is also provided with a second GPIO _2 port. The control circuit 60 may output an invalid level signal through the second GPIO _2 port after detecting the shutdown operation, and the motherboard 10 executes a normal shutdown procedure after receiving the invalid level signal.

If the control circuit 60 detects that the duration of the pressing operation is greater than the target duration, the control circuit 60 may confirm that the forced shutdown operation is detected. At this time, the control circuit 60 may detect whether the main board 10 and the display panel 20 are in a dead halt state, respectively. Wherein the target time length is a fixed time length pre-stored in the control circuit 60.

To sum up, the embodiment of the present disclosure provides a projection apparatus, where when a control circuit in the projection apparatus determines that a motherboard is in a dead halt state and a display panel is not in the dead halt state, the control circuit may first control a light valve to reset, and then control a light valve power supply circuit to stop supplying power to the light valve. And when the display panel is determined to be in the dead halt state, the light valve power supply circuit can be controlled to stop supplying power to the light valve. Therefore, the condition that the light valve in the projection equipment is damaged due to the fact that the user directly pulls out the power supply to restart the projection equipment can be avoided, and the service life of the projection equipment is prolonged.

In the embodiment of the present disclosure, in the process of the control circuit 60 detecting whether the main board 10 and the display panel 20 are in the dead halt state, the control circuit 60 may send probe messages to the main board 10 and the display panel 20, respectively. If the control circuit 60 receives the response message sent by the motherboard 10 within the first communication duration, the control circuit 60 may determine that the motherboard 10 is not in the dead halt state. If the control circuit 60 does not receive the response message sent by the motherboard 10 within the first communication duration, the control circuit 60 may determine that the motherboard 10 is in a dead halt state. The first communication time period may be a fixed time period pre-stored in the control circuit 60.

If the control circuit 60 receives a response message transmitted by the display panel 20 within the second communication period, the control circuit 60 may determine that the display panel 20 is not in the dead halt state. If the control circuit 60 does not receive the response message transmitted by the display panel 20 within the second communication period, the control circuit 60 may determine that the display panel 20 is in the dead halt state. The second communication time period may be a fixed time period pre-stored in the control circuit 60.

Alternatively, the control circuit 60 may be connected to the main board 10 and the display panel 20 through I2C, respectively, so that the control circuit 60 may transmit probe messages to the main board 10 and the display panel 20 through I2C, and at the same time, the main board 10 and the display panel 20 may transmit response messages to the control circuit 60 through I2C.

In the embodiment of the present disclosure, if the control circuit 60 detects that the main board 10 is in the dead halt state and the display panel 20 is not in the dead halt state, it may send a reset instruction to the display panel 20. The display panel 20 may control the light valve 30 to reset in response to the reset command.

Referring to fig. 3, the light valve 30 includes a plurality of dmd devices arranged in an array, and a distance between any two adjacent dmd devices is small. 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 to transmit a first target control signal to the light valve 30 during the power-on of the projection apparatus. The first target control signal is used to control the light valve 30 to deflect from the initial position to the target position. Then, in the process of displaying an image by the projection apparatus, the display panel 20 controls the light valve 30 to deflect with the target position as the initial position by the light valve control signal Ct, and the deflected light valve 30 is used for transmitting the light beam transmitted by the light source 40 to the projection lens 50.

In controlling the resetting of the light valve 30, the display panel 20 transmits a second target control signal to the light valve 30, the second target control signal being used to control the deflection of the light valve 30 to the initial position. The display panel 20 then controls the light valve power supply circuit 70 to stop supplying power to the light valve 30, so that the light valve 30 finishes discharging the stored charges.

If the display panel 20 does not control the light valve 30 to reset before the display panel 20 is in the power-off state, the control circuit 60 controls the display panel 20 to power off, and then 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 charge stored in the light valve 30 is not discharged completely. The charge stored in the light valve 30 drives the light valve 30 to deflect at a larger angle, i.e. the light valve 30 comprises the plurality of dmd at a larger angle, thereby causing any two adjacent dmd to collide and causing damage to part of the dmd.

In the embodiment of the present disclosure, if the control circuit 20 detects that the motherboard 10 is in the crash state and the display panel 20 is not in the crash state, the control circuit 20 sends a reset instruction to the display panel 20, so as to control the light valve 30 to be reset before controlling the display panel 20 to be in the power-off state, and control the light valve power supply circuit 70 to stop supplying power to the light valve 30. Thereby preventing the light valve 30 from being damaged due to the fact that the light valve 30 is not reset after the display panel 20 is powered off or the charges stored in the light valve 30 are not discharged, and ensuring the reliability of the control of the light valve 30.

Referring to fig. 4, the light valve power supply circuit 70 may 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 circuit R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first power terminal Vc, a second power terminal Vo, a third power terminal Vb, a fourth power terminal Vr, a fifth power terminal G1, a sixth power terminal G2, a seventh power terminal G3, and an eighth power terminal G4.

The control terminal of the first switch sub-circuit U1 is connected to the display panel 20, and the input terminal of the first switch sub-circuit U1 is connected to one terminal 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. The output terminal of the first switch sub-circuit U1 is connected to the fifth power terminal G1, and the other terminal of the first resistor R1 is connected to the first power terminal Vc.

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

The input terminal of the third switching sub-circuit U3 is connected to one terminal of a third resistor R3, the output terminal of the third switching sub-circuit U3 is connected to a seventh power source terminal G3, the other terminal of the third resistor R3 is connected to one terminal of a third power source terminal Vb, and the other terminal of the third power source terminal Vb is connected to the light valve 30.

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

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 may be all direct-current 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 may be ground terminals (GND).

Referring to fig. 3 and 4, during the projection of the display image by the projection apparatus, the display panel 20 outputs the 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 the active level. At this time, after the power signal provided from the first power terminal Vc passes through the first resistor R1, a portion of the power signal is transmitted to the fifth power terminal G1 through the first switch sub-circuit U1. The other part of the signal is transmitted to 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 to transmit the power signal.

Since the voltage of the other part of the signal is low, the second switching sub-circuit U2, the third switching sub-circuit U3 and the fourth switching sub-circuit U4 are turned off under the control of the other part of the signal. At this time, the second, third and fourth switching sub-circuits U2, U3 and U4 are not turned on, and the second, third and fourth power source terminals Vo, Vb and Vr transmit power signals to the light valve 30, respectively, thereby achieving 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 effect control of the deflection of the light valve 30.

The voltage of the power signal transmitted from the second power source terminal Vo to the light valve 30 may be V1, the voltage of the power signal transmitted from the third power source terminal Vb to the light valve 30 may be V2, and the voltage of the power signal transmitted from the fourth power source terminal Vr to the light valve 30 may be V3.

In the process of controlling the reset of the light valve 30 by the display panel 20, the display panel 20 first transmits a second target control signal to the light valve 30, and the light valve 30 is restored to the initial position under the control of the second target control signal. Thereafter, in the process of the display panel 20 controlling the light valve power supply circuit 70 to stop supplying power to the light valve 30, the display panel 20 transmits the enable signal EN at an inactive level to the control terminal of the first switch sub-circuit U1, and the first switch sub-circuit U1 is turned off. The power signal transmitted from the first power source terminal Vc passes through the first resistor R1 and is then transmitted to 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.

Since the first switch sub-circuit U1 is turned off, the first switch sub-circuit U1 does not divide the voltage, and thus 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 higher, and 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 the power signal. At this time, the charge stored in the light valve 30 and the power supply signal supplied from 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 electric charge stored in the light valve 30 and the power supply signal supplied from 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 electric charges stored in the light valve 30 and the power supply signal supplied from the fourth power supply terminal Vr are transferred to the eighth power supply terminal G4 through the fourth resistor R4 and the fourth switching sub-circuit U4, thereby achieving a rapid discharge of the electric charges stored in the light valve 30.

Referring to fig. 5, the projection device may further comprise a power supply control circuit N1, a first input of the power supply control circuit N1 being connected to the control circuit 60, a second input of the power supply control circuit N1 being connected to the display panel 20, an output of the power supply control circuit N1 being connected to the light valve power supply circuit 70. Alternatively, the power supply control circuit N1 may be an and logic device.

The control circuit 60 is also configured to send a first control signal to the power supply control circuit N1. The display panel 20 is also configured to send an enable signal EN to the power supply control circuit N1, the enable signal EN being at an active level when the display panel 20 is in the power-on state, and being at an inactive level when the display panel 20 is in the power-off state.

Optionally, a third GPIO _3 port is further disposed on the control circuit 60, and the control circuit 60 may send the first control signal to the power supply control circuit N1 through the third GPIO _3 port.

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 any one of the first control signal and the enable signal EN is at an inactive 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 an active level.

When the display panel 20 is in a dead halt state, the first control signal is at an inactive level. When the main board 10 is in a dead halt state and the display panel 20 is not in the dead halt state, the first control signal is at an inactive level.

In the embodiment of the present disclosure, the control circuit 60 is further configured to control the circuit board in the dead halt state in the motherboard 10 and the display panel 20 to restart if it is detected that the motherboard 10 and/or the display panel 20 is in the dead halt state.

Referring to fig. 5, the projection apparatus may further include a first switch SW1, a second switch SW2, and a power supply 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 motherboard 10.

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 panel 20.

Referring to fig. 5, the control terminal of the second switch SW2 is connected to the main board 10. Alternatively, referring to fig. 6, the control terminal of the second switch SW2 is connected to the control circuit 60. Alternatively, referring to fig. 7, the control terminal of the second switch SW2 is connected to the control circuit 60 and the main board 10.

The control circuit 60 is configured to control the first switch SW1 to be turned off if the main board 10 is detected to be in a dead halt state, and control the first switch SW1 to be turned on after the first switch SW1 is turned off for a first time period. Wherein the first time period is a fixed time period pre-stored in the control circuit 60.

In the embodiment of the present disclosure, after the control circuit 60 controls the first switch SW1 to be turned off, 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 may provide a 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 turned off first and then controls the first switch SW1 to be turned on, so as to control the motherboard 10 to be in the power-off state first and then control the motherboard 10 to be in the power-on state, thereby restarting the motherboard 10.

The control circuit 60 is configured to control the second switch SW2 to be turned off if the display panel 20 is detected to be in a dead halt state, and to control the second switch SW2 to be turned on after turning off the second switch SW2 for a second period of time. Wherein the second time period is a fixed time period pre-stored in the control circuit 60.

In the embodiment of the present disclosure, after the control circuit 60 controls the second switch SW2 to be turned off, the power supply board 80 stops supplying the power supply signal to the display panel 20, thereby putting the display panel 20 in the power-off state. The control circuit 60 may provide the power supply board 80 with a power supply signal to the display panel 20 after controlling the second switch SW2 to be closed, thereby putting the display panel 20 in a power-on state. The control circuit 60 controls the display panel 20 to be in the power-off state first and then controls the display panel 20 to be in the power-on state by controlling the second switch SW2 to be opened and then controlling the second switch SW2 to be closed, thereby restarting the display panel 20.

In the embodiment of the present disclosure, when the host 10 is in a dead halt state and the display panel 20 is not in the dead halt state, the control circuit 60 may respectively control the motherboard 10 and the display panel 20 to restart, or may only control the motherboard 10 to restart.

If the control circuit 60 controls the motherboard 10 and the display panel 20 to restart respectively, the control circuit 60 is further configured to send a reset instruction to the display panel 20 if it is detected that the motherboard 10 is in a dead halt state and the display panel 20 is not in the dead halt state. The display panel 20 may control the light valve 30 to reset in response to the reset command. The display panel 20 then sends a reset confirmation message to the control circuit 60 after controlling the light valve 30 to reset. 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 message. The first switch SW1 is then controlled to open, and after the first switch SW1 is opened for a first period of time, the first switch SW1 is opened and closed.

Optionally, a fourth GPIO _4 port is disposed on the display panel 20, and the display panel 20 may send the reset confirmation information to the control circuit 60 through the fourth GPIO _4 port.

For a scenario that the host 10 is in a dead halt state and the display panel 20 is not in the dead halt state, the control circuit 60 controls the motherboard 10 and the display panel 20 to restart respectively after controlling the light valve power supply circuit 70 to stop supplying power to the light valve 30, as an alternative implementation manner of the embodiment of the present disclosure, referring to fig. 5, a control terminal of the second switch SW2 is connected to the motherboard 10. The main board 10 is configured to control the second switch SW2 to be closed in a power-on state, and the second switch SW2 to be open in a power-off state of the main board 10.

When the main board 10 is in the power-on state, the power supply board 80 supplies a power supply signal to the display panel 20 since the second switch SW2 is closed, and the display panel 20 is in the power-on state. When the main board 10 is in the power-off state, the power board 80 stops supplying the power signal to the display panel 20 because the second switch SW2 is turned off, and the display panel 20 is in the power-off state.

In the embodiment of the present disclosure, after controlling the light valve power supply circuit 70 to stop supplying power to the light valve 30, the control circuit 60 turns off the first switch SW1, so that the main board 10 and the display panel 20 are both in the power-off state. The control circuit 60 then controls the first switch SW1 to close, so that the main board 10 and the display panel are in the power-on state, thereby controlling the control circuit 60 to restart the main board 10 and the display panel 20 respectively.

For a scenario that the host 10 is in a dead halt state and the display panel 20 is not in the dead halt state, the control circuit 60 controls the motherboard 10 and the display panel 20 to restart respectively after controlling the light valve power supply circuit 70 to stop supplying power to the light valve 30, as another alternative implementation manner of the embodiment of the disclosure, referring to fig. 7, the projection apparatus may further include a switch control circuit N2. A first input terminal of the switch control circuit N2 is connected to the control circuit 60, a second input terminal of the switch control circuit N2 is connected to the main board 10, and an output terminal of the switch control circuit N2 is connected to a control terminal of the second switch SW2, so that the control terminal of the second switch SW2 is connected to the main board 10 and the control circuit 60. Alternatively, referring to fig. 7, the switch control circuit N2 may be a logic or device.

The control circuit 60 is further 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 used for controlling the second switch SW2 to close if the second control signal is detected to be active level and/or the third control signal is detected to be active level. The switch control circuit N2 is used for controlling the second switch SW2 to open if the second control signal and the third control signal are both detected to be inactive level.

Alternatively, the control circuit 60 sends the level of the second control signal to the switch control circuit N2 as an inactive level after controlling the light valve power supply circuit 70 to stop supplying power to the light valve 30. When the motherboard 10 is in the dead halt state and the power-off state, the level of the third control signal sent by the motherboard 10 to the switch control circuit N2 is an invalid level.

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 at the inactive level to the switch control circuit N2, the control circuit 60 may control the main board 10 to be in the power-off state first and then control the display panel 20 to be in the power-off state. The control circuit 60 may then control the main board 10 and the display panel 20 to be in a powered-on state.

Since the third control signal is at an inactive level and the second control signal is at an inactive level after the main board 10 is in the power-off state, the switch control circuit N2 can control the second switch SW2 to be turned off, and the display panel 20 is also in the power-off state.

The order in which the control circuit 60 controls the main board 10 and the display panel 20 to be in the power-on state is not limited in the embodiment of the present disclosure. For example, the control circuit 60 controls the main board 10 to be in the power-on state, and then controls the display panel 20 to be in the power-on state. Alternatively, the control circuit 60 may first control the first switch SW1 to be closed, so as to control the main board 10 to be in the power-on state. The control circuit 60 may then send a switch close command to the motherboard 10 and/or the control circuit 60 may send a first switch signal to the active level or the inactive level. The main board 10 may transmit a third control signal at an active level to the switch control circuit N2 in response to the switch-on command, so that the switch control circuit N2 controls the second switch SW2 to be closed, thereby implementing that the display panel 20 is in a power-on state.

Alternatively, the control circuit 60 controls the display panel 20 to be in the power-on state first, and then controls the main board 10 to be in the power-on state. Alternatively, the control circuit 60 may send a second 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 be closed, thereby implementing that the display panel 20 is in the power-on state. The control circuit 20 may then control the first switch SW1 to close to control the main board 10 to be in the power-on state.

Alternatively, the control circuit 60 may control the main board 10 and the display panel 20 to be in the power-on state at the same time. Alternatively, the control circuit 60 may send the second control signal at the active level to the switch control circuit N2 while controlling the first switch SW1 to be closed.

Optionally, a fifth GPIO _5 port is further disposed on the control circuit 60, and the control circuit 60 may send the second control signal to the switch control circuit N2 through the fifth GPIO _5 port. The motherboard 10 may be provided with a sixth GPIO _6 port, and the motherboard 10 may send a third control signal to the switch control circuit N2 through the sixth GPIO _6 port.

Referring to fig. 7, if the control circuit 60 detects that the display panel 20 is in the dead halt state and the main board 10 is not in the dead halt state, the control circuit 60 may first control the light valve power supply circuit 70 to stop supplying power to the light valve 30. The control circuit 60 may then control the display panel 20 to restart. In the process of controlling the display panel 20 to restart, the control circuit 60 may control only the display panel 20 to restart, or may control the display panel 20 and the main board 10 to restart respectively, which is not limited in this disclosure.

For the scenario that the control circuit 60 detects that the display panel 20 is in the dead halt state and the main board 10 is not in the dead halt state, the control circuit 60 may control only the display panel 20 to restart. As an alternative implementation, referring to fig. 7, the control circuit 60 may send a switch-off instruction to the main board 10, and the main board 10 may send a third control signal at an inactive level to the switch control circuit N2 in response to the switch-off instruction. At the same time, the control circuit 60 also sends the second control signal at the inactive level to the switch control circuit N2. The switch control circuit N2 may further control the second switch SW2 to be turned off in response to the second control signal and the third control signal, thereby putting the display panel 20 in a power-off state.

Thereafter, after the second switch SW2 is turned off for a second time period, the control circuit 40 may send a switch closing command to the main board 10, and the main board 10 may send a third control signal at an active level to the switch control circuit N2 in response to the switch closing command. At this time, the level of the second control signal transmitted from the control circuit 60 to the switch control circuit N2 may be at an inactive level or at an active level. The switch control circuit N2 can control the second switch SW2 to close under the control of the second control signal and the third control signal, so that the display panel 20 is in the power-on state, and the display panel 20 is restarted. Alternatively, the control circuit 40 may send the level of the second control signal at the active level to the switch control circuit N2 after the second switch SW2 is turned off for a second period of time. The switch control circuit N2 can control the second switch SW2 to close under the control of the second control signal, so that the display panel 20 is in a power-on state, and the display panel 20 is restarted.

As another alternative implementation manner, referring to fig. 5, when the control circuit 60 detects that the display panel 20 is in the dead halt state and the main board 10 is not in the dead halt state, the control circuit 60 may send a switch-off instruction to the main board 10, where the control circuit 60 controls only the display panel 20 to restart. The main board 10 may control the second switch SW2 to be turned off in response to the switch off command, thereby putting the display panel 20 in an off state. Thereafter, after the second switch SW2 is turned off for a second time period, the control circuit 40 may send a switch-on command to the main board 10, and the main board 10 may control the second switch SW2 to be turned on in response to the switch-on command, thereby implementing the restart of the display panel 20.

The control circuit 60 may further control the motherboard 10 and the display panel 20 to restart respectively when the control circuit 60 detects that the display panel 20 is in the crash state and the motherboard 10 is not in the crash state. Alternatively, the control circuit 20 may control the main board 10 and the display panel 20 to be in the power-off state first, and then control the main board 10 and the display panel 20 to be in the power-on state.

The order in which the control circuit 60 controls the main board 10 and the display panel 20 to be in the power-off state and the order in which the control circuit 60 controls the main board 10 and the display panel 20 to be in the power-on state are not limited in the embodiment of the present disclosure.

For example, the control circuit 60 may control the display panel 20 to be in the power-off state before controlling the main board 10 to be in the power-off state. The control circuit 60 may then control the main board 10 to be in the power-on state and then control the display panel 20 to be in the power-on state, thereby restarting the main board 10 and the display panel 20. For the process of the control circuit 60 controlling the display panel 20 to be in the power-on state and the power-off state, and the process of the control circuit 60 controlling the main board 10 to be in the power-on state and the power-off state, reference may be made to the above embodiments, and further description of the embodiments of the present disclosure is omitted here.

In this embodiment of the disclosure, if the main board 10 and the display panel 20 are both in a dead halt state, the control circuit 60 is further configured to first control the light valve power supply circuit 70 to stop supplying power to the light valve 30, and then control the main board 10 and the display panel 20 to restart respectively, and for the process of controlling the main board 10 and the display panel 20 to restart by the control circuit 60, reference may be made to the above-mentioned embodiment, and details of this embodiment of the disclosure are not repeated again.

Alternatively, referring to fig. 5 and 7, the control circuit 60 may control the main board 10 to be in a power-off state, then control the main board 10 to be in a power-on state, and then control the display panel 20 to be in a power-on state, respectively.

In the embodiment of the present disclosure, after controlling the main board 10 and the display panel 20 to be in the power-off state, the control circuit 60 may further turn off the light source 40, thereby preventing the projection lens from projecting the laser beam to the projection screen when the projection screen does not display an image, and ensuring the display effect.

In the related art, referring to fig. 8, the projection apparatus may include a main board 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 panel 3 is connected to the main board 1 and the display panel 2, and the display panel 2 is connected to the light valve 4 and the power supply circuit 5. The control terminal of the switch SW is connected to the main board 1, the input terminal of the switch SW is connected to the power board 3, and the output terminal of the switch SW is connected to the display panel 2. The power supply board 3 may supply power to the main board 1, the display panel 2 and other components in the projection device, and the power supply circuit 5 is used to supply power to the light valve 4.

In the normal shutdown process of the projection device, the motherboard 1 may generate a shutdown instruction after detecting a click instruction of a user for the shutdown button 0. And may send the shutdown instruction to the display panel 2, and the display panel 2 may control the light valve 4 to deflect to the initial position in response to the shutdown instruction, and control the power supply circuit 5 to stop supplying power to the light valve 4. The display panel 2 may then send a confirmation instruction to the main board 1, and the main board 1 may respond to the confirmation instruction to control the power panel 3 to stop supplying power to some devices in the main board 1, the display panel 2, and other devices in the projection apparatus, so as to implement shutdown of the projection apparatus, and then the main board 1 may respond to the startup instruction to control the power panel 3 to supply power to all devices in the projection apparatus, so as to implement restart of the projection apparatus.

In the related art, when the motherboard 1 crashes, it cannot detect or respond to the shutdown command. At this time, the user can only unplug the power supply of the projection device, and restart the projection device after the power supply is plugged again for the projection device, so as to restart the main board 1. However, after the main board 1 crashes, other devices in the projection apparatus may still be in a working state, and therefore, a user may restart the main board by pulling out the power supply, which may damage a light valve in the projection apparatus.

In the embodiment of the disclosure, when the control circuit in the projection apparatus determines that the main board is in the dead halt state and the display panel is not in the dead halt state, the light valve may be reset first, and then the light valve power supply circuit is controlled to stop supplying power to the light valve. The light valve power supply circuit may be controlled to stop supplying power to the light valve when it is determined that the display panel is in a dead halt state. Therefore, the situation that the light valve in the projection equipment is damaged due to the fact that a user directly unplugs the power supply to restart the projection equipment is avoided, and the reliability of operation of the projection equipment is ensured.

To sum up, the embodiment of the present disclosure provides a projection apparatus, where when a control circuit in the projection apparatus determines that a motherboard is in a dead halt state and a display panel is not in the dead halt state, the control circuit may first control a light valve to reset, and then control a light valve power supply circuit to stop supplying power to the light valve. And the control circuit can control the light valve power supply circuit to stop supplying power to the light valve when the display panel is determined to be in the dead halt state. Therefore, the condition that the light valve in the projection equipment is damaged due to the fact that the user directly pulls out the power supply to restart the projection equipment can be avoided, and the service life of the projection equipment is prolonged.

Fig. 9 is a schematic structural diagram of another projection apparatus provided in an embodiment of the present disclosure. As shown in fig. 9, the projection apparatus may include a main board 10, a display panel 20, a light valve 30, a light source 40, a projection lens 50, and a control circuit 60.

The main board 10 is connected to the display panel 20, and the main board 10 is used for transmitting image signals to the display panel 20;

the display panel 20 is further connected to the light valve 30, and the display panel 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 from the light source 40 to the projection lens 50. The projection lens 50 is used for projecting and imaging the light beam.

The control circuit 60 is connected to the motherboard 10 and the display panel 20, and the control circuit 60 is configured to detect whether the motherboard 10 and the display panel 20 are in a dead halt state if a forced shutdown operation is detected. If the motherboard 10 is detected to be in the crash state and the display panel 20 is not in the crash state, the motherboard 10 is controlled to restart and the operation state of the display panel 20 is not adjusted.

To sum up, the embodiment of the present disclosure provides a projection apparatus, where when a control circuit in the projection apparatus detects a forced shutdown operation, if it is determined that a motherboard is in a dead halt state and a display panel is not in the dead halt state, the motherboard may be controlled to restart. Therefore, the situation that the device in the projection equipment is damaged due to the fact that the user directly unplugs the power supply to restart the projection equipment is avoided, and the reliability of operation of the projection equipment is ensured.

When the host 10 is in a dead halt state and the display panel 20 is not in the dead halt state, if the main control circuit 60 controls the motherboard 10 to restart only, the main control circuit 60 is further configured to send a prompt instruction to the display panel 20 if it is detected that the motherboard 10 is in the dead halt state and the display panel 20 is not in the dead halt state. The display panel 20 is also used for responding to the prompt instruction, displaying prompt information on the projection screen, and sending prompt confirmation information to the main control circuit 60, wherein the prompt information is used for prompting that the main board 10 is restarted. The main control circuit 60 is configured to control the motherboard 10 to restart after receiving the prompt confirmation message.

Referring to fig. 7, in the process of the main control circuit 60 controlling only the main board 10 to restart, the main control circuit 60 sends the second control signal at an active level to the switch control circuit N1, thereby ensuring that the switch control circuit N1 can control the second switch SW2 to close when the main board 10 is in the power-off state, and thus ensuring that the display panel 20 is in the power-on state. And the prompt information is displayed on the projection screen by controlling the display panel 20, so that the user knows that the main board 10 is restarted currently, and the situation that the user directly unplugs the power supply in the restarting process of the main board 10 is avoided, thereby ensuring the reliability of the control of the projection device.

Alternatively, the main control circuit 60 may send a prompt instruction to the display panel 20 through I2C. The display panel 20 may also send a prompt acknowledgement to the main control circuit 60 via I2C.

In the embodiment of the present disclosure, after the main control circuit 60 controls the main board 10 to restart, the main board 10 may send an image signal to the display panel 10, so that the display panel 20 displays an image.

Fig. 10 is a flowchart of a control method of a projection apparatus provided in an embodiment of the present disclosure, and is applied to the projection apparatus shown in any one of fig. 1, fig. 2, and fig. 5 to fig. 7, and as shown in fig. 10, the method may include:

step 1001, if the control circuit detects a forced shutdown operation, the control circuit sends detection signals to the motherboard and the display panel respectively.

Step 1002, if the control circuit detects that the response signal sent by the motherboard is not received in the first communication duration and the response signal sent by the display panel is received in 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 control of the light valve reset.

Step 1003, if the control circuit detects that the response signal sent by the display panel is not received within the second communication time period, the control circuit controls the light valve power supply circuit to stop supplying power to the light valve.

To sum up, the embodiment of the present disclosure provides a control method for a projection apparatus, where when a control circuit in the projection apparatus determines that a motherboard is in a dead halt state and a display panel is not in the dead halt state, the control circuit may first control a light valve to reset, and then control a light valve power supply circuit to stop supplying power to the light valve. And the control circuit can control the light valve power supply circuit to stop supplying power to the light valve when the display panel is determined to be in the dead halt state. Therefore, the condition that the light valve in the projection equipment is damaged due to the fact that the user directly pulls out the power supply to restart the projection equipment can be avoided, and the service life of the projection equipment is prolonged.

Fig. 11 is a flowchart of a method for controlling a projection apparatus, which may be applied to the projection apparatuses shown in fig. 1, fig. 2, and fig. 5 to fig. 7 according to an embodiment of the present disclosure. As shown in fig. 11, the method may include:

step 1101, if the control circuit detects the forced shutdown operation, the control circuit sends detection signals to the main board and the display panel respectively.

Step 1102, if the control circuit detects that the response signal sent by the main board is not received in the first communication time period and the response signal sent by the display panel is received in the second communication time period, the control circuit sends a reset instruction to the display panel.

And step 1103, the display panel controls the light valve to reset in response to the reset instruction.

At step 1104, the control circuit sends a first control signal at an inactive level to the power supply control circuit.

Step 1105, the display panel sends an enable signal at an active level to the power control circuit.

And step 1106, the power supply control circuit controls the light valve power supply circuit to stop supplying power to the light valve under the control of the first control signal at the inactive level and the enable signal at the active level.

Step 1107, the control circuit controls the mainboard to restart.

The implementation process of step 1101 to step 1107 can refer to the above device embodiment, and details of the embodiment of the present disclosure are not repeated herein.

Fig. 12 is a flowchart of a method for controlling a projection apparatus, which may be applied to the projection apparatus shown in any one of fig. 1, fig. 2, and fig. 5 to fig. 7 according to an embodiment of the present disclosure. As shown in fig. 12, the method may include:

step 1201, if the control circuit detects the forced shutdown operation, the control circuit sends detection signals to the main board and the display panel respectively.

Step 1202, if the control circuit does not receive the response signal sent by the display panel within the second communication time period, the control circuit sends a first control signal at an invalid level to the power supply control circuit.

Step 1203, the display panel sends an enable signal at an active level to the power control circuit.

Wherein, when the display panel is in the power-on state, the enable signal is the active level, and when the display panel is in the power-off state, the enable signal is the inactive level.

In step 1204, the power supply control circuit controls the light valve power supply circuit to stop supplying power to the light valve when any one of the first control signal and the enable signal is at an invalid level.

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

Step 1205, the control circuit controls the display panel to restart.

The implementation process of step 1201 to step 1205 may refer to the above apparatus embodiment, and the embodiment of the present disclosure is not described herein again.

Fig. 13 is a flowchart of a control method of a projection apparatus according to an embodiment of the present disclosure, where the method may be applied to the projection apparatus shown in fig. 7 or fig. 9. As shown in fig. 13, the method may include:

step 1301, if the control circuit detects a forced shutdown operation, the control circuit sends detection signals to the main board and the display panel respectively.

Step 1302, if the control circuit detects that the response signal sent by the motherboard is not received in the first communication duration and the response signal sent by the display panel is received in the second communication duration, the control circuit controls the motherboard to restart and does not adjust the running state of the display panel.

The implementation processes of step 1301 and step 1302 may refer to the above apparatus embodiment, and the embodiment of the present disclosure is not described herein again.

To sum up, the embodiments of the present disclosure provide a method for controlling a projection device, where when a control circuit in the projection device detects a forced shutdown operation, if it is determined that a motherboard is in a dead halt state and a display panel is not in the dead halt state, the motherboard may be controlled to restart. Therefore, the situation that the device in the projection equipment is damaged due to the fact that the user directly unplugs the power supply to restart the projection equipment is avoided, and the service life of the projection equipment is prolonged.

Fig. 14 is a flowchart of a control method of another projection apparatus provided by an embodiment of the present disclosure, and the method may be applied to the projection apparatus shown in fig. 7 or fig. 9. As shown in fig. 14, the method may include:

step 1401, if the control circuit detects the forced shutdown operation, it detects whether the motherboard and the display panel are in a dead halt state respectively.

Step 1402, if the control circuit detects that the response signal sent by the motherboard is not received within the first communication time period and the response signal sent by the display panel is received within the second communication time period, the control circuit sends a prompt instruction to the display panel.

Step 1403, the display panel responds to the prompt instruction, displays prompt information on the projection screen, and sends prompt confirmation information to the control circuit.

The prompt information is used for prompting that the mainboard is restarting and controls the mainboard to restart.

And step 1404, after receiving the prompt confirmation information, the control circuit controls the mainboard to restart.

The implementation process of step 1401 to step 1404 may refer to the above apparatus embodiment, and the embodiment of the present disclosure is not described herein again.

It should be noted that, the order of the steps of the control method for the projection apparatus provided in the embodiment of the present application may be appropriately adjusted, and the steps may also be deleted according to the situation. For example, the above steps 1102 to 1107 may be deleted as appropriate. Or step 1202 to step 1205 may be deleted as appropriate. Or step 1302 may be deleted as appropriate. Or steps 1402 to 1404 may be deleted as appropriate. Any method that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application is covered by the protection scope of the present application, and thus the detailed description thereof is omitted.

The disclosed embodiment provides a projection device, including: memory, a processor and a computer program stored on the memory, the processor when executing the computer program implementing the steps performed by the control circuit in the method embodiment according to the above aspect (e.g. the embodiment shown in any of fig. 10 to 14).

Embodiments of the present disclosure provide a computer-readable storage medium having stored therein instructions that, when executed by a processor, implement the steps performed by the control circuitry in the method embodiments of the aspects described above (e.g., any of the embodiments shown in fig. 10-14).

Embodiments of the present disclosure provide a computer program product comprising instructions which, when run on the computer, cause the computer to perform the steps performed by the control circuitry in the method embodiments of the aspects described above (e.g. any of the embodiments shown in fig. 10 to 14).

In the disclosed embodiments, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", and "eighth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" in the embodiments of the present disclosure means two or more. The term "and/or" in the embodiments of the present disclosure is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A projection device, characterized in that the projection device comprises: the projection device comprises a main board, a display panel, a light valve, a light source, a projection lens, a control circuit and a light valve power supply circuit connected with the light valve;

the projection lens is used for projecting and imaging the light beam;

2. The projection apparatus according to claim 1, wherein the control circuit is configured to send a reset instruction to the display panel if it is detected that the main board is in a dead halt state and the display panel is not in a dead halt state;

the display panel is used for responding to the reset instruction and controlling the light valve to reset.

3. The projection device of claim 1, wherein the projection device further comprises: a power supply control circuit;

the first input end of the power supply control circuit is connected with the control circuit, the second input end of the power supply control circuit is connected with the display panel, and the output end of the power supply control circuit is connected with the light valve power supply circuit;

the control circuit is also used for sending a first control signal to the power supply control circuit;

the display panel is also used for sending an enabling signal to the power supply control circuit; wherein, when the display panel is in a power-on state, the enable signal is at an active level, and when the display panel is in a power-off state, 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 any one of the first control signal and the enable signal is at an inactive 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 an active level.

4. The projection device of claim 3, wherein the power control circuit is an AND logic device.

5. The projection device of any of claims 1-4, wherein the control circuit is further configured to:

and if the mainboard and/or the display panel are detected to be in the dead halt state, controlling the circuit board in the dead halt state in the mainboard and the display panel to restart.

6. The projection device of claim 5, wherein the projection device further comprises: the power supply comprises a first switch, a second switch and a power supply board;

the control end of the first switch is connected with the control circuit, the input end of the first switch is connected with the power panel, and the output end of the first switch is connected with the mainboard;

the control end of the second switch is connected with the control circuit and/or the mainboard, the input end of the second switch is connected with the power panel, and the output end of the second switch is connected with the display panel;

the control circuit is further used for controlling the first switch to be switched off if the mainboard is detected to be in a dead halt state, and controlling the first switch to be switched on after the first switch is switched off for a first time;

the control circuit is further configured to control the second switch to be turned off if the display panel is detected to be in a dead halt state, and to control the second switch to be turned on after the second switch is turned off for a second duration.

7. The projection device of claim 6, wherein a control terminal of the second switch is connected to the main board;

the main board is used for controlling the second switch to be closed in a power-on state;

and when the mainboard is in a power-off state, the second switch is turned off.

8. The projection device of claim 6, wherein the projection device further comprises: a first input end of the switch control circuit is connected with the control circuit, a second input end of the switch control circuit is connected with the mainboard, and an output end of the switch control circuit is connected with a control end of the second switch;

the control circuit is also used for sending a second control signal to the switch control circuit;

the main board is further used for sending a third control signal to the switch control circuit;

the switch control circuit is configured to control the second switch to be closed if the second control signal is detected to be an active level and/or the third control signal is detected to be an active level, and to control the second switch to be opened if the second control signal and the third control signal are both detected to be an inactive level.

9. The projection device of claim 8, wherein the switch control circuit is a logical or device.

10. A projection device, characterized in that the projection device comprises: the device comprises a main board, a display board, a light valve, a light source, a projection lens and a control circuit;

the projection lens is used for projecting and imaging the light beam;

11. The projection apparatus according to claim 10, wherein the control circuit is further configured to send a prompt instruction to the display panel if it is detected that the main board is in a dead halt state and the display panel is not in a dead halt state;

the display panel is further used for responding to the prompt instruction, displaying prompt information on the projection screen and sending prompt confirmation information to the control circuit, wherein the prompt information is used for prompting that the mainboard is restarted;

and the control circuit is also used for controlling the mainboard to restart after receiving the prompt confirmation information.

12. The projection device of claim 10, wherein the projection device further comprises: the power panel, the switch control circuit and the second switch; a first input end of the switch control circuit is connected with the control circuit, a second input end of the switch control circuit is connected with the mainboard, an output end of the switch control circuit is connected with a control end of the second switch, an input end of the second switch is connected with the power panel, and an output end of the second switch is connected with the display panel;

the switch control circuit is configured to control the second switch to be closed if the second control signal is detected to be an active level and/or the third control signal is detected to be an active level.

13. A control method of a projection device is applied to the projection device, and the projection device comprises the following steps: the control circuit is respectively connected with the mainboard, the display panel and the light valve power supply circuit, and the light valve power supply circuit is also connected with the light valve; the method comprises the following steps:

14. The method of claim 13, wherein the controlling the light valve reset comprises:

the control circuit sends a reset instruction to the display panel;

the display panel controls the light valve to reset in response to the reset instruction.

15. The method of claim 13, wherein the projection device further comprises: a power supply control circuit; the first input end of the power supply control circuit is connected with the control circuit, the second input end of the power supply control circuit is connected with the display panel, and the output end of the power supply control circuit is connected with the light valve power supply circuit;

the controlling the light valve power supply circuit to stop supplying power to the light valve includes:

the control circuit sends a first control signal to the power supply control circuit, wherein the first control signal is an invalid level when the display panel is in a dead halt state;

the display panel sends an enabling signal to the power supply control circuit; wherein, when the display panel is in a power-off state, the enable signal is at an inactive level;

and the power supply control circuit controls the light valve power supply circuit to stop supplying power to the light valve under the control of the first control signal and the enabling signal.

16. The method of any of claims 13 to 15, further comprising:

if the control circuit detects that a response signal sent by the mainboard is not received within a first communication time length, the control circuit controls the mainboard to restart;

and if the control circuit detects that the response signal sent by the display panel is not received within the second communication time length, the control circuit controls the display panel to restart.

17. A control method of a projection device is applied to the projection device, and the projection device comprises the following steps: the display device comprises a control circuit, a mainboard and a display panel, wherein the control circuit is respectively connected with the mainboard and the display panel; the method comprises the following steps:

18. The method of claim 17, wherein prior to controlling the motherboard to reboot, the method further comprises:

the control circuit sends a prompt instruction to the display panel;

the display panel responds to the prompt instruction, displays prompt information on the projection screen and sends prompt confirmation information to the control circuit, wherein the prompt information is used for prompting that the mainboard is restarted;

and the control circuit controls the mainboard to restart after receiving the prompt confirmation information.