CN112383761B - Projection apparatus and control method thereof - Google Patents
Projection apparatus and control method thereof Download PDFInfo
- Publication number
- CN112383761B CN112383761B CN202011247566.6A CN202011247566A CN112383761B CN 112383761 B CN112383761 B CN 112383761B CN 202011247566 A CN202011247566 A CN 202011247566A CN 112383761 B CN112383761 B CN 112383761B
- Authority
- CN
- China
- Prior art keywords
- display panel
- control circuit
- light valve
- switch
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
- Controls And Circuits For Display Device (AREA)
- Transforming Electric Information Into Light Information (AREA)
Abstract
The application discloses a projection device and a control method thereof, and belongs to the field of projection display. The main board of the projection equipment is used for sending the video image signal to the display board; the display panel is used for generating a light valve control signal according to the video image signal, and the light valve receives the light beam emitted by the light source and is controlled by the light valve control signal to modulate the light beam; the control circuit is respectively connected with the mainboard and the display panel. The control circuit is used for: and if the forced shutdown operation is detected, controlling the light valve to reset. The technical scheme can avoid the damage to the light valve caused by forced shutdown operation of the projection equipment.
Description
Technical Field
The present disclosure relates to projection displays, and particularly to a projection apparatus and a control method thereof.
Background
The projection device may include a power board to which each of the functional circuit boards is connected. The power strip may provide power to a circuit board and other components in the projection device. When the device normally operates, for example, the main board may respond to a shutdown instruction to control the power board to stop supplying power to part of devices in the main board and other devices in the projection device, thereby implementing shutdown of the projection device, and then the main board may respond to a startup instruction to control the power board to supply power to all devices in the projection device, thereby implementing restart of the projection device.
In the related art, a dead halt phenomenon may occur in the operation process of the device, and the shutdown instruction cannot be detected or responded. At this time, the user can only unplug the power supply of the projection device and reconnect the power supply to the projection device to restart the projection device.
However, such a restart by unplugging the power supply may cause the operating components of the projection device to be suddenly powered off before the power supply is interrupted, especially causing damage to delicate electro-optical components or failure problems when restarting.
Disclosure of Invention
The embodiment of the application provides projection equipment and a control method thereof, and the problem that in the related art, a user restarts a mainboard in a mode of pulling out a power supply and possibly damages other devices in the projection equipment can be solved. The technical scheme is as follows:
in one aspect, a projection apparatus is provided, the projection apparatus comprising: the display device comprises a main board, a display board, a light valve, a light source and a control circuit;
the main board is used for sending the video image signal to the display panel;
the display panel is arranged to generate a light valve control signal in dependence on the video image signal,
the light valve receives the light beam emitted by the light source and is controlled by the light valve control signal to modulate the light beam;
the control circuit is respectively connected with the main board and the display panel,
the control circuit is used for:
and if the forced shutdown operation is detected, controlling the light valve to reset.
In another aspect, a method for controlling a projection apparatus is provided, where the method is applied to the projection apparatus, and includes:
if the control circuit detects forced shutdown operation, detecting whether the mainboard is in a dead halt state;
if the control circuit detects that the mainboard is in a halt state, a reset instruction is sent to the display panel;
the display panel responds to the reset instruction, controls the light valve to reset and sends reset confirmation information to the control circuit;
the control circuit receives the reset confirmation information and cuts off the power supply of the main board.
In yet another aspect, a projection apparatus is provided, including: the display device comprises a main board, a display board, a light valve, a light source and a control circuit;
the main board is used for sending the video image signal to the display panel;
the display panel is arranged to generate a light valve control signal in dependence on the video image signal,
the light valve receives the light beam emitted by the light source and is controlled by the light valve control signal to modulate the light beam;
the control circuit is respectively connected with the main board and the display panel,
the control circuit is used for:
if a forced shutdown operation is detected, the light valve is prevented from resetting.
In another aspect, a method for controlling a projection apparatus is provided, the method including:
if the control circuit detects forced shutdown operation, detecting whether the mainboard is in a dead halt state;
if the control circuit detects that the mainboard is in a halt state, a prompt instruction is sent to the display panel, and the display panel is controlled to be in a power-on state;
the display panel responds to the prompt instruction, displays prompt information on the projection screen and sends prompt confirmation information to the control circuit;
and after receiving the prompt confirmation information, the control circuit controls to cut off the power supply of the mainboard.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the embodiment of the application provides a projection device and a control method thereof, wherein a control circuit in the projection device can control the light valve to reset or avoid the light valve to reset when detecting the forced shutdown operation. Therefore, the situation that the light valve device 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.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a projection apparatus according to an embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of another projection apparatus provided in an embodiment of the present application;
FIG. 3 is a schematic circuit diagram of another projection apparatus provided in an embodiment of the present application;
FIG. 4 is a schematic circuit diagram of a projection apparatus according to an embodiment of the present disclosure;
FIG. 5 is a schematic circuit diagram of another projection apparatus provided in an embodiment of the present application;
FIG. 6 is a schematic circuit diagram of a projection apparatus according to an embodiment of the present disclosure;
fig. 7 is a flowchart of a control method for a projection apparatus according to an embodiment of the present disclosure;
fig. 8 is a flowchart of a control method for a projection apparatus according to another embodiment of the present disclosure;
fig. 9 is a schematic circuit diagram of a projection apparatus in the related art.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic circuit structure diagram of a projection apparatus according to an embodiment of the present disclosure. As shown in fig. 1, 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. 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, for example, a three-color laser light source formed by any one color of a blue laser, a red laser, and a green laser, or any two colors. 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 for transmitting the video image signal 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 video image signal to the display panel 20 via the I2C.
And, the main board 10 and the display panel 20 transmit signals through the I/O port, for example, the display panel 20 notifies the main board 10 whether to enter the standby mode through the I/O port.
The display panel 20 is further connected to the light valve 30, the display panel 20 is configured to generate a light valve control signal according to a video image signal, and control the light valve 30 to flip according to the light valve control signal, the light source 40 emits an illumination beam to illuminate on a light receiving surface of the light valve 30, and the light valve 30 is controlled to transmit the light beam emitted by the light source 40 to the projection lens 50 for enlarged imaging and projection to an imaging medium.
Alternatively, the display panel 20 may generate a light valve control signal according to the pixel value of the pixel in the video 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 to project a light beam to a projection screen, thereby realizing display of an image on the projection screen.
The control circuit 60 is connected to the main board 10 and the display panel 20, respectively. The control circuit 60 and the display panel 20 may be connected via a serial port to transmit communication signals. The control circuit 60 may also be connected to the motherboard 10 via a serial port or an I/O port to transmit a communication signal, and the control circuit 60 is further configured to send a switch signal for controlling the power supply of the motherboard 10.
In one embodiment, the communication signal between the control circuit 60 and the motherboard 10 may be transmitted by the control circuit 60 sending a detection signal to the motherboard 10, and the motherboard 10 returning a feedback signal.
And, the communication signal between the control circuit 60 and the display panel 20 may be a feedback or notification signal that the control circuit 60 receives from the display panel 20.
In the embodiment of the present application, 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.
Fig. 2 shows a specific circuit structure of the laser projection apparatus based on fig. 1.
Referring to fig. 2, a remote controller for controlling the projection apparatus may be provided with keys, and/or a housing of the projection apparatus may be provided with keys. Typically, a user signals a key press to the projection device control circuitry by pressing the key.
In one implementation, the key signal may be a forced shutdown operation by a user. The forced shutdown operation may be a pressing operation for a key on the projection device, or the forced shutdown operation may be a pressing operation for a key on a remote controller. Alternatively, the key may be a power-off button.
In one embodiment, if the key is a power-off button, the control circuit 60 detects whether the duration of the pressing operation of the key by the user is greater than a set duration. If it is detected that the duration of the pressing operation is less than or equal to the set 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 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.
The control circuit 60 may be provided with a first general purpose input/output (GPIO) GPIO _1 port corresponding to a key operation of a user. 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 a pressing operation of the key 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 key 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).
A second GPIO _2 port is further disposed between the control circuit 60 and the motherboard 20 for outputting a control signal. The control circuit 60 may output an invalid level signal through the second GPIO _2 port after recognizing the shutdown operation, and the motherboard 10 executes a 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 set duration, the control circuit 60 recognizes the forced shutdown operation. At this time, the control circuit 60 may detect whether the main board 10 is in a dead halt state. If the motherboard 10 is detected to be in a crash state, the control circuit 60 may control the motherboard 10 to restart.
Specifically, the control circuit 60 may send a request message to the motherboard 10, such as communicating with the motherboard via I2C. If the control circuit 60 receives a response message sent by the motherboard 10 within the response duration, the control circuit 60 may determine that the motherboard 10 is not in the dead halt state. Wherein the response time period may be a fixed time period pre-stored in the control circuit 60.
Referring to fig. 2, the projection apparatus may further include a first switch SW1, a second switch SW2, and a power supply board 70. 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 70, 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 supply board 70, and the output terminal of the second switch SW2 is connected to the display panel 20.
Referring to fig. 2, the control terminal of the second switch SW2 is connected to the main board 10. Alternatively, referring to fig. 3, the control terminal of the second switch SW2 is connected to the control circuit 60. Alternatively, referring to fig. 4, 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 this embodiment, after the control circuit 60 controls the first switch SW1 to be turned off, the power board 70 stops providing the power signal to the motherboard 10, and the motherboard 10 is in a power-off state. After the control circuit 60 controls the first switch SW1 to be closed, the power board 70 may provide a power signal to the motherboard 10, and the motherboard 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.
And, the control circuit 60 is further configured to send a reset command to the display panel 20 if the main board 10 is detected to be in a dead halt state. The display panel 20 is used for controlling 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 first switch SW1 to open after receiving the reset confirmation message, and open the first switch SW1 to close after opening the first switch SW1 for a first duration.
In one implementation, the display panel 20 is provided with a third GPIO _3 port, and the display panel 20 can send the reset confirmation message to the control circuit 60 through the third GPIO _3 port.
Referring to fig. 5 and 6, the projection apparatus may further include a light valve power supply circuit 80 connected to the display panel 20 and the light valve 30.
The light valve 30, for example a DMD digital micromirror array, includes a plurality of tiny mirrors arranged in an array, each of which can be individually driven to perform an angular flip. The display panel 20 is also used to control the light valve power supply circuit 80 to supply power to the light valve 30 during the power-on operation of the projection apparatus. Then, in the process of displaying an image by the projection apparatus, the display panel 20 controls the light valve 30 to deflect based on the reset position by the light valve control signal Ct, and the micro mirrors of the light valve 30 at different deflection angles are used for reflecting and transmitting the light beam transmitted by the light source 40 to the projection lens 50.
In the process of controlling the light valve 80 to reset by the display panel 20, the display panel 20 controls the light valve power supply circuit 80 to stop supplying power to the light valve 30, and the light valve 30 finishes releasing the stored charges, thereby resetting the light valve 30.
If the display panel 20 does not control the light valve 30 to reset and discharge the charges before the display panel 20 is in the power-off state, the light valve power supply circuit 80 stops supplying power to the light valve 30, and the light valve 30 is not deflected to the initial position, and the charges stored in the light valve 30 are not discharged completely. The stored charge has energy, which causes the light valve 30 to be in an unstable state, and also causes a hidden trouble to the next start-up of the DMD, which causes damage, and the light valve 30 is a very precise photoelectric device, which is also a core component of the projection system, and needs a reliable mechanism to ensure its operation.
In the above embodiment of the present application, the control circuit 60 receives the external key signal, detects that the motherboard 10 is in the dead halt state when recognizing the forced shutdown operation, and sends a reset command to the display panel 20, such as a command transmitted via the I2C bus, so that the display panel 20 controls the light valve 30 to reset before being in the power-off state. Thereby preventing damage to the light valve 30 caused by non-resetting the light valve 30 after the power is off from the display panel 20 and ensuring reliable control of the light valve 30.
Referring to fig. 6, the light valve power supply circuit 80 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. 5 and 6, during the projection of a display image by the projection apparatus, the display panel 20 outputs an enable signal EN to the light valve power supply circuit 80, and the first switch circuit U1 is turned on when the enable signal is at an 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 control signal to the light valve 30, and the light valve 30 is restored to the initial position under the control of the control signal. Thereafter, in the process of the display panel 20 controlling the light valve power supply circuit 80 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. 2, a control terminal of the second switch SW2 is connected to the main board 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 70 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 70 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 application, after receiving the reset confirmation message, the control circuit 60 turns off the first switch SW1 to make the main board 10 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.
Referring to fig. 4, the projection device may further include a switch control circuit N1. A first input terminal of the switch control circuit N1 is connected to the control circuit 60, a second input terminal of the switch control circuit N1 is connected to the main board 10, and an output terminal of the switch control circuit N1 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. 4, the switch control circuit N1 may be a logic or device.
The control circuit 60 is further configured to send a first control signal to the switch control circuit N1, and the main board 10 is configured to send a second control signal to the switch control circuit N1. The switch control circuit N1 is configured to control the second switch SW2 to close if the first control signal is detected to be active level and/or the second control signal is detected to be active level. The switch control circuit N1 is configured to control the second switch SW2 to open if the first control signal and the second control signal are both detected as inactive levels.
Alternatively, the control circuit 60 sends the first control signal to the switch control circuit N1 at an inactive level after receiving the reset confirmation message. When the main board 10 is in the dead halt state and the power-off state, the level of the second control signal sent to the switch control circuit N1 is an inactive level.
In the embodiment of the present application, after the control circuit 60 receives the reset confirmation message and sends the first control signal at the inactive level to the switch control circuit N1, the control circuit 60 may control the main board 10 to be in the power-off state, 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 second control signal is at an inactive level and the first control signal is at an inactive level after the main board 10 is in the power-off state, the switch control circuit N1 can control the second switch SW2 to be turned off, and the display panel 20 is also in the power-off state.
The present embodiment does not limit the sequence in which the control circuit 60 controls the main board 10 and the display panel 20 to be in the power-on state. 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 the second control signal at the active level to the switch control circuit N1 in response to the switch-on command, so that the switch control circuit N1 controls the second switch SW2 to be closed, thereby implementing that the display panel 20 is in the 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 the first control signal at an active level to the switch control circuit N1 so that the switch control circuit N1 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 first control signal at the active level to the switch control circuit N1 while controlling the first switch SW1 to be closed.
Optionally, a fourth GPIO _4 port is further disposed on the control circuit 60, and the control circuit 60 may send the first control signal to the switch control circuit N1 through the fourth GPIO _4 port. A fifth GPIO _5 port may be disposed on the main board 10, and the main board 10 may send the second control signal to the switch control circuit N1 through the fifth GPIO _5 port.
Referring to fig. 4, in the process that the control circuit 60 controls only the main board 10 to restart, the control circuit 60 sends the first 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, thereby ensuring that the display panel 20 is in the power-on state. The display panel 20 is also used to display a prompt message on the projection screen in the above-mentioned power-on state, the prompt message being used to prompt that the main board 10 is being restarted.
And the display panel 20 is used for sending confirmation information to the control circuit 60 while displaying the prompt information, and the control circuit 60 is used for controlling the main board 10 to restart after receiving the prompt confirmation information. 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 control circuit 60 may send a prompt instruction to the display panel 20 via I2C. The display panel 20 may also send prompt acknowledgement information to the control circuit 60 via I2C.
In the embodiment of the present application, after the control circuit 60 controls the main board 10 to restart, the main board 10 may transmit a video image signal to the display panel 10 so that the display panel 20 displays a projection image without displaying the hint information.
Therefore, in the embodiment shown in fig. 3 or fig. 4, after the control circuit 60 receives an external forced shutdown operation instruction, the control circuit may not send a reset signal to the display panel 20, but ensure that the display panel 20 has a normal power supply state through the control signal, and does not power off due to power off of the main board 10, thereby also avoiding a sudden power off situation of the light valve 30 and ensuring reliability of operation of the light valve 30.
In the related art, as shown in fig. 9, 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 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 other devices in the projection apparatus.
In the above embodiment of the application, the control circuit can directly send the reset signal to the display panel before the power failure of the main board when the main board is in a dead halt state, and the display panel resets the light valve according to the reset signal and releases the charge energy, so that the situation that a user directly unplugs a power supply to restart the projection equipment to cause damage to devices in the projection equipment is avoided, and the reliability of operation of the projection equipment is ensured. Or the control circuit also outputs a control signal for controlling the power supply of the display panel, and when the control circuit is in the process of powering off and powering on the mainboard, the control signal keeps the normal power supply of the display panel, so that the display panel is not influenced by the power on and off of the mainboard, the power supply of the light valve cannot be interrupted suddenly, and the reliable operation of the light valve is ensured.
Fig. 7 is a flowchart of a control method of a projection apparatus according to an embodiment of the present application, and is applied to the projection apparatus shown in any one of fig. 1 to 4, where as shown in fig. 7, the method includes:
Specifically, the forced shutdown operation may exceed a preset duration of the key signal. The dead halt state may be that the motherboard cannot respond or issue an instruction signal, for example, the control circuit does not receive a response signal for the probe signal sent by the motherboard within the first communication duration.
Specifically, the main control circuit issues a reset instruction to the display panel through I2C.
And step 703, the display panel responds to the reset instruction, controls the light valve to reset, and sends reset confirmation information to the control circuit.
The display panel cuts off the power-off of the light valve by outputting an invalid enable signal to the light valve power supply circuit, and resets the light valve.
And the display panel also turns off the laser according to the reset instruction.
The display panel enters a standby mode.
And step 703, the control circuit receives the signal and cuts off the power supply of the mainboard.
Specifically, the display panel feeds back a signal which enters a standby mode through the I/O port, the control circuit confirms that the light valve is reset after receiving the feedback signal, and then the control circuit cuts off the power supply of the mainboard through the switch to enable the mainboard to enter a power-off state.
And, further, the control method further comprises:
and step 704, after the power supply of the mainboard is cut off for a preset time, the power supply of the mainboard is recovered.
Referring to fig. 2, 3, and 4, the projection apparatus may further include a first switch SW1, a second switch SW2, and a power supply board 70. 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, and the output terminal of the first switch SW1 is connected to the main board 10. The first switch SW1 is used to control the power on and off of the main board 10.
And, further, the control method further comprises: and after the power supply of the main board is disconnected for a preset time, the power supply of the main board is recovered.
To sum up, an embodiment of the present application provides a method for controlling 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 crash state, a reset instruction is directly sent to a display panel, so as to perform a power-off restart operation on the motherboard in the crash state after a light valve is reset. Therefore, the situation that the light valve device 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.
Referring also to fig. 3, in fig. 4, a control terminal of the second switch SW2 is connected to the control circuit 60 and/or the main board 10, an input terminal of the second switch SW2 is connected to the power board, and an output terminal of the second switch SW2 is connected to the display panel 20.
As an optional implementation manner of this embodiment of the present application, the projection device may further include a switch control circuit, a first input end of the switch control circuit is connected to the control circuit, a second input end of the switch control circuit is connected to the main board, and an output end of the switch control circuit is connected to a control end of the second switch.
The control circuit sends a first control signal to the switch control circuit. The main board sends a second control signal to the switch control circuit. The switch control circuit controls the second switch to be closed if detecting that the first control signal is an effective level and/or detecting that the second control signal is an effective level, and controls the second switch to be opened if detecting that the first control signal and the second control signal are both invalid levels.
Fig. 8 is a flowchart of a control method for a projection apparatus according to an embodiment of the present disclosure, where the method may be applied to the projection apparatus shown in fig. 3 or 4. As shown in fig. 8, the method may include:
And step 802, if the control circuit detects that the mainboard is in a halt state, sending a prompt instruction to the display panel, and controlling the display panel to be in a power-on state.
Specifically, as shown in fig. 3, the control circuit ensures that the display panel is in the energized state by outputting a control signal to the second switch SW1 so that the second switch SW1 is in an active state of turning on the power supply board.
Or as in fig. 4, the control circuit outputs a control signal which is in phase with or behind the control signal output by the main board as a switch control signal for supplying power to the display panel. Specifically, a control terminal of the second switch SW2 is connected to both the control circuit and the main board, an input terminal of the second switch is connected to the power board, and an output terminal of the second switch is connected to the display board.
And step 803, 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 restarted.
And step 804, after receiving the prompt confirmation information, the control circuit controls to disconnect the power supply of the mainboard.
And, the above method may further comprise:
step 805: and after the power supply of the main board is disconnected for a preset time, the power supply of the main board is recovered.
The embodiment of the application provides a control method of projection equipment, when a control circuit in the projection equipment detects forced shutdown operation, if a mainboard is determined to be in a dead halt state, the power supply state of a display panel is kept, the display panel prompts the mainboard to be restarted, and a main control circuit receives prompt confirmation information of the display panel and then powers off and restarts the mainboard. Therefore, the situation that the user directly unplugs the power supply to restart the projection equipment to cause damage to devices in the projection equipment is avoided, and in the embodiment, the real version is not powered off, so that the situation that the light valve is suddenly powered off is avoided, and the reliability of the operation of the projection equipment is ensured.
The embodiment of the application provides a laser projection equipment, includes: a memory, a processor and a computer program stored on the memory, the processor implementing the steps performed by the control circuit in the above-described method embodiments (e.g. the embodiments shown in fig. 7 and 8) when executing the computer program.
Embodiments of the present application provide a computer-readable storage medium, which stores instructions that, when executed by a processor, implement the steps performed by the control circuit in the method embodiments (e.g., the embodiments shown in fig. 7 and 8) according to the above aspects.
Embodiments of the present application provide a computer program product containing instructions, which when run on the computer, cause the computer to perform the steps performed by the control circuit in the method embodiments (e.g., the embodiments shown in fig. 7 and 8) according to the above aspect.
In the embodiments of the present application, 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 application means two or more. In the embodiment of the present application, the term "and/or" 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 only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (13)
1. A projection device, characterized in that the projection device comprises: the display device comprises a main board, a display board, a light valve, a light source and a control circuit;
the main board is used for sending video image signals to the display panel;
the display panel is arranged to generate a light valve control signal in dependence on the video image signal,
the light valve receives the light beam emitted by the light source and is controlled by the light valve control signal to modulate the light beam;
the control circuit is respectively connected with the mainboard and the display panel, and the display panel is connected with the light valve;
the control circuit is configured to:
if the forced shutdown operation is detected, detecting whether the mainboard is in a dead halt state,
if the mainboard is in a dead halt state, controlling the mainboard to send a reset instruction to the display panel before powering off;
the display panel is used for responding to the reset instruction and controlling the light valve to reset.
2. The projection device of claim 1, wherein the control circuit is coupled to the display panel via an I2C bus and sends the reset command via an I2C bus.
3. The projection device of claim 1, wherein the display panel is configured to receive a reset command from the control circuit and reply a reset confirmation message to the control circuit.
4. The projection device of claim 3, wherein the display panel is coupled to the control circuit via an I/O port and feeds back a reset acknowledge message via the I/O port.
5. The projection device of claim 1, wherein the projection device further comprises:
a light valve power supply circuit connected with the light valve,
and the display panel is connected with the light valve power supply circuit and is used for controlling the light valve power supply circuit to stop supplying power to the light valve after controlling the light valve to reset.
6. The projection device of claim 1, wherein the display panel is further configured to control the light source to be turned off after the light valve is reset.
7. The projection device of claim 1, 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 configured to control the first switch to be turned off if the mainboard is detected to be in a dead halt state, and control the first switch to be turned on after the first switch is turned off for a first time period.
8. The projection device of claim 7, 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.
9. 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 and the display panel, and the display panel is connected with the light valve; the method comprises the following steps:
if the control circuit detects forced shutdown operation, detecting whether the mainboard is in a dead halt state;
if the control circuit detects that the mainboard is in a dead halt state, a reset instruction is sent to the display panel;
the display panel responds to a reset instruction, controls the light valve to reset and sends reset confirmation information to the control circuit;
and the control circuit receives the reset confirmation information and cuts off the power supply of the mainboard.
10. A projection device, characterized in that the projection device comprises: the light valve control system comprises a main board, a display board, a light valve, a light source, a control circuit and a light valve power supply circuit;
the main board is used for sending video image signals to the display panel;
the display panel is arranged to generate a light valve control signal in dependence on the video image signal,
the light valve receives the light beam emitted by the light source and is controlled by the light valve control signal to modulate the light beam;
the control circuit is respectively connected with the mainboard and the display panel,
the display panel is respectively connected with the light valve and the light valve power supply circuit;
the light valve power supply circuit is connected with the light valve and used for supplying power to the light valve;
the control circuit is configured to:
and if the forced shutdown operation is detected and the mainboard is detected to be in a halt state, the control circuit outputs a control signal for controlling the power supply of the display panel, when the control circuit is in the process of powering off and on the mainboard, the control signal keeps the normal power supply of the display panel, and the display panel controls the light valve power supply circuit to keep the normal power supply of the light valve.
11. The projection device of claim 10, wherein the projection device further comprises: a first switch and a power panel;
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 circuit is 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.
12. The projection device of claim 11, further comprising a second switch,
the control end of the second switch is connected with the control circuit and 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 second switch is controlled to put the display panel in a power-on state.
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 and the display panel, and the light valve power supply circuit is connected with the light valve; the method comprises the following steps:
if the control circuit detects forced shutdown operation, detecting whether the mainboard is in a dead halt state;
if the control circuit detects that the mainboard is in a halt state, a prompt instruction is sent to the display panel, and the display panel is controlled to be in a power-on state;
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 after receiving the prompt confirmation information, the control circuit controls to cut off the power supply of the mainboard, and the display panel controls the light valve power supply circuit to keep the normal power supply of the light valve.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011247566.6A CN112383761B (en) | 2020-11-10 | 2020-11-10 | Projection apparatus and control method thereof |
| CN202180075749.0A CN116490837A (en) | 2020-11-10 | 2021-11-10 | Projection apparatus and control method thereof |
| PCT/CN2021/129719 WO2022100599A1 (en) | 2020-11-10 | 2021-11-10 | Projection device and control method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011247566.6A CN112383761B (en) | 2020-11-10 | 2020-11-10 | Projection apparatus and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112383761A CN112383761A (en) | 2021-02-19 |
| CN112383761B true CN112383761B (en) | 2021-12-10 |
Family
ID=74578167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011247566.6A Active CN112383761B (en) | 2020-11-10 | 2020-11-10 | Projection apparatus and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112383761B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116490837A (en) * | 2020-11-10 | 2023-07-25 | 青岛海信激光显示股份有限公司 | Projection apparatus and control method thereof |
| CN113109987B (en) * | 2021-05-17 | 2022-09-23 | 青岛海信激光显示股份有限公司 | Laser projection equipment, liftable screen and laser television |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200609648A (en) * | 2004-09-15 | 2006-03-16 | Coretronic Corp | Projector protection apparatus |
| CN103034027A (en) * | 2011-09-30 | 2013-04-10 | 中强光电股份有限公司 | Projector and light source thereof control method |
| CN103777365A (en) * | 2012-10-24 | 2014-05-07 | 中国科学院光电研究院 | Laser projection display system and method |
| CN206039423U (en) * | 2016-06-22 | 2017-03-22 | 深圳优美创新科技有限公司 | Automatic re -setting's circuit under electronic equipment torpor |
| CN109982147A (en) * | 2019-03-13 | 2019-07-05 | 青岛海信电器股份有限公司 | Resetting apparatus, reset processing method and display equipment |
| CN210465970U (en) * | 2019-05-29 | 2020-05-05 | 中强光电股份有限公司 | Miniature projector |
| CN111158152A (en) * | 2020-02-17 | 2020-05-15 | Oppo广东移动通信有限公司 | Head-mounted display device and DLP projection system |
| CN211826864U (en) * | 2020-04-20 | 2020-10-30 | 青岛海信激光显示股份有限公司 | Laser projection device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5434564B2 (en) * | 2008-12-26 | 2014-03-05 | セイコーエプソン株式会社 | Projector, light source lighting device, and projector control method |
-
2020
- 2020-11-10 CN CN202011247566.6A patent/CN112383761B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200609648A (en) * | 2004-09-15 | 2006-03-16 | Coretronic Corp | Projector protection apparatus |
| CN103034027A (en) * | 2011-09-30 | 2013-04-10 | 中强光电股份有限公司 | Projector and light source thereof control method |
| CN103777365A (en) * | 2012-10-24 | 2014-05-07 | 中国科学院光电研究院 | Laser projection display system and method |
| CN206039423U (en) * | 2016-06-22 | 2017-03-22 | 深圳优美创新科技有限公司 | Automatic re -setting's circuit under electronic equipment torpor |
| CN109982147A (en) * | 2019-03-13 | 2019-07-05 | 青岛海信电器股份有限公司 | Resetting apparatus, reset processing method and display equipment |
| CN210465970U (en) * | 2019-05-29 | 2020-05-05 | 中强光电股份有限公司 | Miniature projector |
| CN111158152A (en) * | 2020-02-17 | 2020-05-15 | Oppo广东移动通信有限公司 | Head-mounted display device and DLP projection system |
| CN211826864U (en) * | 2020-04-20 | 2020-10-30 | 青岛海信激光显示股份有限公司 | Laser projection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112383761A (en) | 2021-02-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112383761B (en) | Projection apparatus and control method thereof | |
| US5629694A (en) | Computer keyboard with power control key | |
| US6274949B1 (en) | Back-up power accessory for a computer | |
| US5897252A (en) | Peripheral device control method and printing apparatus | |
| CN213399172U (en) | Laser projection device | |
| CN213846882U (en) | Laser projection device | |
| CN112379762A (en) | Projection apparatus and control method thereof | |
| WO2022100599A1 (en) | Projection device and control method therefor | |
| US20220157214A1 (en) | Display device, driving method thereof, and display system | |
| CN217361092U (en) | Laser projection device | |
| JP2005049651A (en) | Display device | |
| CN110049264B (en) | Laser television power supply control system and method | |
| CN112463443A (en) | Server with AC LOSS function and method for automatically powering on and starting up after abnormal power failure | |
| JP2008134275A (en) | Projector and light source control method | |
| CN113891052B (en) | Laser projection equipment and starting method thereof | |
| WO2020019615A1 (en) | Method and device for controlling start-up of device, and interactive intelligent plate | |
| JP2007034963A (en) | Electronic equipment | |
| CN217361091U (en) | Laser projection equipment | |
| CN117116162A (en) | Laser projection apparatus and control method thereof | |
| CN112565721B (en) | Projector control method and projector | |
| CN115695740A (en) | Laser projection equipment and projection display method | |
| CN117235004B (en) | Control method and device of server, terminal equipment and readable storage medium | |
| CN114974054A (en) | Laser projection system and control method | |
| US20230314919A1 (en) | Method of controlling display device and display device | |
| CN219105455U (en) | Multisystem switching processing device and interaction panel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |