CN117116162A

CN117116162A - Laser projection apparatus and control method thereof

Info

Publication number: CN117116162A
Application number: CN202210530203.6A
Authority: CN
Inventors: 朱亚文; 陈许; 孙鹏林; 于君才
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2022-05-16
Filing date: 2022-05-16
Publication date: 2023-11-24

Abstract

The application discloses laser projection equipment and a control method thereof, and belongs to the technical field of electronics. The system-level chip in the laser projection equipment can directly control the power panel to supply power for the fan module, the light valve control assembly, the light valve power supply assembly and the light source driving assembly in response to a starting instruction, and supply power for the temperature detection module. Because the system-level chip does not need to control each component to be electrified through a main control circuit on the display panel, the starting-up process is simplified, the starting-up time of the laser projection equipment is shortened, and the user experience is good.

Description

Laser projection apparatus and control method thereof

Technical Field

The disclosure relates to the field of electronic technology, and in particular, to a laser projection device and a control method thereof.

Background

Currently, a laser projection device may project a projection image onto a projection screen after detecting a selection operation for a power-on button, thereby realizing display of the projection image. However, the laser projection device in the related art is long in power-on time.

Disclosure of Invention

The embodiment of the disclosure provides a laser projection device and a control method thereof, which can solve the problem of long time for starting the laser projection device in the related art. The technical scheme is as follows:

In one aspect, a control method of a laser projection device is provided, where the laser projection device includes a system-in-chip, a power panel, a fan module, a temperature detection module, a light valve control assembly, a light valve power supply assembly, a light source driving assembly, and a light source; the method comprises the following steps:

the system-in-chip responds to a starting instruction, controls the power panel to supply power for the fan module, the light valve control assembly and the light valve power supply assembly, and supplies power for the temperature detection module;

the light valve control assembly is powered on to control the light valve power supply assembly to supply power to the light valve;

and after the system-level chip determines that the light valve is successfully electrified, controlling the power panel to supply power for the light source driving assembly so as to drive the light source to emit light beams.

On the other hand, a control method of the laser projection equipment is provided, the laser projection equipment comprises a system-level chip, a power panel, a light valve control assembly, a light source driving assembly, a light source, a light valve power supply assembly, a fan module and a temperature detection module; the method comprises the following steps:

the system-in-chip responds to standby operation, sends a standby instruction to the light valve control assembly, and controls the power panel to stop supplying power to the light source driving assembly so as to stop the light source from emitting light beams;

The light valve control component responds to the standby instruction and controls the light valve power supply component to stop supplying power to the light valve;

and after the system-in-chip determines that the light valve is powered down successfully, controlling the power panel to stop supplying power to the fan module, the light valve control assembly and the light valve power supply assembly, and stopping supplying power to the temperature detection module.

In yet another aspect, a laser projection device is provided, the laser projection device including a system-in-chip, a power panel, a fan module, a temperature detection module, a light valve control assembly, a light valve power supply assembly, a light source driving assembly, and a light source;

the system-in-chip is used for responding to a starting instruction, controlling the power panel to supply power for the fan module, the light valve control assembly and the light valve power supply assembly, and supplying power for the temperature detection module;

the light valve control assembly is used for controlling the light valve power supply assembly to supply power to the light valve after power is supplied;

the system-in-chip is also used for controlling the power panel to supply power for the light source driving assembly after the successful power-on of the light valve is determined, so as to drive the light source to emit light beams.

In yet another aspect, a laser projection device is provided, the laser projection device including a system-on-chip, a power board, a light valve control assembly, a light source drive assembly, a light source, a light valve power assembly, a fan module, and a temperature detection module;

The system-in-chip is used for responding to standby operation, sending a standby instruction to the light valve control assembly, and controlling the power panel to stop supplying power to the light source driving assembly so as to stop the light source from emitting light beams;

the light valve control component is used for responding to the standby instruction and controlling the light valve power supply component to stop supplying power to the light valve;

and the system-in-chip is also used for controlling the power panel to stop supplying power to the fan module, the light valve control assembly and the light valve power supply assembly after the successful power-down of the light valve is determined, and stopping supplying power to the temperature detection module.

The technical scheme provided by the embodiment of the disclosure has the beneficial effects that at least:

the embodiment of the disclosure provides a laser projection device and a control method thereof, wherein a system-level chip can directly control a power panel to supply power for a fan module, a light valve control assembly, a light valve power supply assembly and a light source driving assembly in response to a starting instruction and supply power for a temperature detection module. Because the system-level chip does not need to control each component to be electrified through a main control circuit on the display panel, the starting-up process is simplified, the starting-up time of the laser projection equipment is shortened, and the user experience is good.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of a laser projection device according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a power-on process of a laser projection device according to an embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a laser projection device according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a power-on process of a laser projection device according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a power-on process of another laser projection device according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of another laser projection device provided in an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a laser projection device according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a structure of yet another laser projection device provided by an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a further laser projection device provided in an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of a further laser projection device provided in an embodiment of the present disclosure;

FIG. 11 is a schematic diagram of a further laser projection device provided in an embodiment of the present disclosure;

FIG. 12 is a schematic diagram of a power-on process of yet another laser projection device provided by an embodiment of the present disclosure;

fig. 13 is a schematic diagram of a standby process of a laser projection device according to an embodiment of the present disclosure;

fig. 14 is a schematic diagram of a standby process of a laser projection device according to an embodiment of the present disclosure;

fig. 15 is a schematic diagram of a standby process of another laser projection device provided in an embodiment of the present disclosure.

Detailed Description

For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.

Referring to fig. 1, the laser projection device may generally include a main board 10, a display panel 20, a System On Chip (SOC) 110, a main control circuit 210, a display control circuit 211, a light source driving circuit 212, a power supply circuit 213, a fan 214, a temperature sensor 215, an eye protection plate 216, a diffusion wheel 217, a light valve 218, and a light source 219.

The system-in-chip 110 is located on the motherboard 10, and the main control circuit 210, the display control circuit 211, the light source driving circuit 212, the fan 214, the temperature sensor 215, the eye protection plate 216 and the diffusion wheel 217 are all located on the display panel 20. The main control circuit 210 is a micro control unit (micro controller unit, MCU), also called a singlechip.

The system-in-chip 110 is connected to a main control circuit 210, a power supply circuit 213, and a display control circuit 211, respectively, and the main control circuit 210 is connected to a fan 214, a temperature sensor 215, a human eye protection plate 216, and a diffusion wheel 217, respectively. The power supply circuit 213 is also connected to a display control circuit 211 and a light source driving circuit 21, respectively, the display control circuit 211 is also connected to a light valve 218, and the light source driving circuit 212 is also connected to a light source 219.

Referring to fig. 2, the power-on process of the laser projection device may include the steps of:

in step 201, the system-on-chip responds to the power-on operation, controls the main control circuit to power on after power on, and sends a power-on instruction to the main control circuit.

Step 202, after power-on, the main control circuit responds to a starting instruction to control the fan, the temperature detector, the diffusion wheel and the human eye protection board to power on, sets the rotation speeds of the fan and the diffusion wheel, detects whether the fan and the temperature detector work normally or not, and determines whether to start the human eye protection function or not based on signals detected by the human eye protection board.

Alternatively, the main control circuit may directly power the fan, temperature detector, diffusion wheel and eye protection assembly.

Step 203, the main control circuit controls the display control circuit to power on after determining that the fan and the temperature detector are both working normally.

The main control circuit can control the power supply circuit to supply power for the display control circuit.

Step 204, the display control circuit controls the light valve to be powered on after powering on.

Step 205, the display control circuit outputs a control signal to the light source driving circuit after the light valve is powered on.

The control signal is used for indicating the light source driving circuit to drive the light source to emit light beams.

Step 206, the main control circuit controls the light source driving circuit to power up after the light valve is powered up.

The main control circuit can control the power supply circuit to supply power for the light source driving circuit.

Step 207, after the light source driving circuit is powered on, the light source is driven to emit light beams under the control of the control signal.

Referring to fig. 1, the laser projection device may further include a universal serial bus (universal serial bus, USB) interface circuit 220 provided on the display panel. The USB interface circuit 220 is connected to the system on chip 110, the display control circuit 211, and the main control circuit 220, respectively. The USB interface circuit 220 is used to transmit data transmitted by the system on chip to the main control circuit 210 and the display control circuit 211.

Fig. 3 is a schematic structural diagram of a laser projection device according to an embodiment of the present disclosure, and as shown in fig. 3, the laser projection device may include a system-on-chip 30, a power board 31, a fan module 32, a temperature detection module 33, a light valve control assembly 34, a light valve power supply assembly 35, a light source driving assembly 36, a light valve 37, and a light source 38. The laser projection device may be a miniaturized laser projection device.

The system-in-chip 30 is located on the motherboard 300, and the fan module 32 and the temperature detection module 33 are located on the periphery of the motherboard 300 and not located on the display panel 301. The light valve control assembly 34, the light valve power supply assembly 35, and the light source driving assembly 36 are all disposed on the display panel 301. The system-in-chip 30 is connected to a power panel 31 and a temperature detection module 33, respectively. The power panel 31 is further connected to a fan module 32, a light valve control assembly 34, a light valve power supply assembly 35, and a light source driving assembly 36, wherein the light valve power supply assembly 35 is further connected to a light valve 37, and the light source driving assembly 36 is further connected to a light source 38.

The light valve control assembly 34 may be a digital light processing chip (digital light processing chip, DLPC). The fan module 32 may include at least one fan for dissipating heat from the internal components of the laser projection device. The temperature detection module 33 may include at least one temperature detector. Each of the temperature detectors may be a negative temperature coefficient (negative temperature coefficient, NTC) sensor. The at least one temperature detector is configured to detect a temperature of an internal component of the laser projection device and an ambient temperature (AMB) of the laser projection device. For example, the at least one temperature detector is used to detect the temperature of the light source. The light source 38 may be a laser light source, such as a Laser Diode (LD).

In the disclosed embodiment, the light source 38 may be a monochromatic laser light source, i.e., the light source 38 may emit a laser beam of one color. Alternatively, the light source 38 may be a bi-color laser light source, i.e., the light source 38 may emit laser beams of two colors. Alternatively, the light source 38 may be a three-color laser light source, i.e., the light source 38 may emit three color laser beams.

Fig. 4 is a flowchart of a control method of a laser projection apparatus according to an embodiment of the present disclosure, which may be applied to the laser projection apparatus shown in fig. 3. As shown in fig. 4, the method includes:

in step 401, the system-in-chip responds to the startup instruction, and controls the power panel to supply power to the fan module, the light valve control assembly and the light valve power supply assembly, and to supply power to the temperature detection module.

In the embodiment of the disclosure, the system-in-chip can respond to a starting instruction to control the power panel to supply power for the fan module, the light valve control assembly and the light valve power supply assembly, and the system-in-chip can supply power for the temperature detection module.

Alternatively, the power-on instruction may be a selected operation for a power-on button. The power-on button can be located on the laser projection device or on a remote controller for controlling the laser projection device.

Step 402, after the light valve control component is powered on, the light valve power supply component is controlled to supply power to the light valve.

After the light valve control assembly and the light valve power supply assembly are powered on, the light valve control assembly can control the light valve power supply assembly to supply power to the light valve.

Step 403, after the system-on-chip determines that the light valve is successfully powered on, the power panel is controlled to supply power to the light source driving assembly so as to drive the light source to emit light beams.

After the system-level chip determines that the light valve is successfully powered on, the power panel can be controlled to supply power for the light source driving assembly, so that the light source driving assembly drives the light source to emit light beams.

Optionally, the light valve control component may send a first acknowledgement signal to the system-on-chip after controlling the light valve power supply component to supply power to the light valve, and the system-on-chip may determine that the light valve is powered up successfully after receiving the first acknowledgement signal.

In summary, the embodiments of the present disclosure provide a control method for a laser projection device, where a system-on-chip may directly control a power board to supply power to a fan module, a light valve control assembly, a light valve power supply assembly, and a light source driving assembly in response to a power-on instruction, and supply power to a temperature detection module. Because the system-level chip does not need to control each component to be electrified through a main control circuit on the display panel, the starting-up process is simplified, the starting-up time of the laser projection equipment is shortened, the control process of the laser projection equipment is further simplified, and the user experience is good.

And because the main control circuit on the display panel is not required to control the power-on of each component, the main control circuit and related components (such as a fan module and a temperature detection module) controlled by the main control circuit are not required to be arranged on the display panel, so that the circuit on the display panel is simplified, the size of the display panel is reduced, the size of the laser projection equipment is further reduced, and the cost of the laser projection equipment is reduced.

Fig. 5 is a flowchart of another control method of a laser projection device according to an embodiment of the present disclosure, which may be applied to the laser projection device shown in fig. 3. As shown in fig. 5, the method may include:

step 501, the system-in-chip responds to a startup instruction, controls the power panel to supply power to the fan module, the light valve control assembly and the light valve power supply assembly, supplies power to the temperature detection module, the diffusion wheel and the human eye protection assembly, and outputs a second control signal to the diffusion wheel.

Referring to fig. 6, the laser projection device may further include a human eye protection assembly 39 coupled to the system-on-chip 30. The system-in-chip can respond to a starting instruction, control the power panel to supply power for the fan module, the light valve control assembly and the light valve power supply assembly, and supply power for the temperature detection module and the human eye protection assembly. Alternatively, the power-on instruction may be a selected operation for a power-on button. The power-on button can be located on the laser projection device or on a remote controller for controlling the laser projection device.

In an embodiment of the present disclosure, referring to fig. 6, if the light source is a three-color laser light source, the laser projection device may further include a diffusion wheel 40 connected to the system-in-chip 30. Correspondingly, the system-on-chip can also respond to a startup instruction to supply power to the diffusion wheel and output a second control signal to the diffusion wheel. The diffusion wheel is used for interfering the laser beams of the three colors emitted by the light source so as to adjust the polarization directions of the laser beams of the three colors. The second control signal may be a pulse width modulated (pulse width modulation, PWM) signal.

After the system-level chip supplies power to the human eye protection component, whether the human eye protection function needs to be started or not can be determined based on a signal fed back by a target object detected by the human eye protection component. The signal fed back by the target object may be an infrared signal radiated by the target object.

Referring to fig. 6, the laser projection device may further include a first power switch S1 and a power switch module 41, and a control terminal of the first power switch S1 and a control terminal of the power switch module 41 are connected to the system on chip 30. The first end of the first power switch S1 and the first end of the power switch module 41 are connected with the power board 31, the second end of the first power switch S1 is connected with the light valve control assembly 34 and the light valve power supply assembly 35, and the second end of the power switch module 41 is connected with the fan module 32.

The system-in-chip 30 may respond to a power-on command and output an enable signal with an active level to the control end of the first power switch S1, so that the first end and the second end of the first power switch S1 are turned on, thereby implementing power supply control of the power panel 31 to power the light valve control component 34 and the light valve power supply component 35. The active level may be a high level.

Optionally, the laser projection device may further comprise a power supply circuit 42, and the power supply circuit 42 is connected to the system-in-chip 10, the power board 31, the second end of the first power switch S1, and the light valve control assembly 34, respectively. After the first end and the second end of the first power switch S1 are turned on, the power supply circuit 42 can sequentially output a power good (PWRGOOD) signal, a first effective power signal PWR1, a second effective power signal PWR2, a third effective power signal PWR3, a fourth effective power signal PWR4, and a power induction signal of an effective level to the light valve control assembly 34 after receiving a power signal provided by the power panel and an effective level signal sent by the system-in-chip, so as to implement powering up the light valve control assembly 34.

The power Sense signal may be a power on Sense (POSENSE) signal. The voltage of the active level power normal signal and the voltage of the active level power sense signal may be 3.3 volts (V). The voltage of the first effective power signal PWR1 may be 1.15V, the voltage of the second effective power signal PWR2 may be 1.8V, the voltage of the third effective power signal PWR3 may be 3.3V, and the voltage of the fourth effective power signal PWR4 may be 1.21V.

The system-in-chip 30 may also output an enable signal with an active level to the control terminal of the power switch module 41 in response to the power-on command, so that the first terminal and the second terminal of the power switch module 41 are turned on, thereby controlling the power panel 31 to supply power to the fan module 32.

In the embodiment of the disclosure, if the fan module 32 includes a plurality of fans, the power switch module 41 includes a plurality of switch circuits correspondingly connected to the plurality of fans. The control end of each switching circuit is connected to the system on chip 30, the first end of each switching circuit is connected to the power board 31, and the second end of each switching circuit is connected to a corresponding one of the fans. The system-in-chip 30 may respond to a power-on command to enable signals of active levels of each switching circuit to turn on the first and second terminals of the switching circuit, thereby causing the power panel 31 to supply power to a fan connected to the switching circuit.

Referring to fig. 7, the fan module 32 may include 7 fans in total from the first fan F1 to the seventh fan F7, and the power switching module 41 may include 7 switching circuits in total from the first switching circuit s1 to the seventh switching circuit s 7. The control terminal of each switching circuit is connected to the system on chip 30 (not shown in fig. 7), the first terminal of each switching circuit is connected to the power board 31 (not shown in fig. 7), and the second terminal of each switching circuit is connected to a corresponding one of the fans.

In embodiments of the present disclosure, the system-on-chip may include a wake-up circuit and other circuits, and the power panel remains unchanged in a state that powers the wake-up circuit while the laser projection device is in a standby state. That is, when the laser projection device is in a standby state, other circuits in the system-in-chip are in an inactive state except for the wake-up circuit in the system-in-chip. Therefore, in the standby state, the wake-up circuit in the system-in-chip can detect a start-up instruction for the laser projection equipment, and can respond to the start-up instruction to wake up other circuits in the system-in-chip and control the power panel to supply power for the other circuits. And other circuits in the system-in-chip can control the power panel to supply power to the fan module, the light valve control assembly and the light valve power supply assembly after being electrified, supply power to the temperature detection module, the diffusion wheel and the human eye protection assembly, and output a second control signal to the diffusion wheel.

Step 502, the diffusion wheel rotates under the control of the second control signal.

After the system-on-chip outputs a second control signal to the diffusion wheel in response to the start-up instruction, the diffusion wheel can rotate under the control of the second control signal. Wherein the rotation speed of the diffusion wheel is positively correlated with the duty ratio of the second control signal.

Step 503, the light valve control component outputs a first control signal to the fan module after power-on.

The system-level chip responds to a starting instruction, and after the power panel is controlled to supply power to the fan module and the light valve control assembly, the power on of the light valve control assembly and the fan module can be realized. Referring to fig. 6, the light valve control assembly 34 is further connected to the fan module 32, and the light valve control assembly can output a first control signal to the fan module after being powered on. The first control signal may be a PWM signal.

Referring to fig. 6, the laser projection device may include a program storage component 43, the program storage component 43 being coupled to the light valve control component 34. After the light valve control component 34 is powered on, a program can be read from the external program storage component 43 for initialization, and a first control signal is output to the fan module 32 after the initialization is completed.

In the embodiment of the disclosure, the first control signal is transmitted to the fan module through the light valve control assembly, so that the rotating speed of the fan module is set, and the workload of the system-in-chip is effectively reduced.

Step 504, the fan module rotates under the control of the first control signal.

After the light valve control component outputs a first control signal to the fan module, the fan module can rotate under the control of the first control signal. The rotating speed of the fan module is positively related to the duty ratio of the first control signal.

Step 505, if the system-on-chip determines that the fan module and the temperature detection module are both in a normal working state, the system-on-chip sends a power supply instruction to the light valve control assembly.

In the embodiment of the disclosure, the system-in-chip can detect whether the fan module and the temperature detection module are in a normal working state, and can supply power instructions to the light valve control assembly if the fan module and the temperature detection module are determined to be in the normal working state. Therefore, the fan module can normally radiate heat for the lighting assembly in the working process of the lighting assembly, and the temperature detection module can accurately detect the temperature of the lighting assembly. The illumination assembly can comprise a light valve control assembly, a light valve, a light source driving assembly, a light source, a light transmission assembly, a projection lens and the like. The light transmission component is used for transmitting the light beam emitted by the light source to the light valve and transmitting the image light beam modulated by the light valve to the projection lens.

If the system-level chip detects that the fan module is not in a normal working state and/or the temperature detection module is not in a normal working state, the system-level chip does not need to supply power instructions to the light valve control module and can send prompt information, so that a user is reminded of repairing the module which is not in the normal working state in the fan module and the temperature detection module. The prompt information may be an audio prompt information.

Optionally, the system-on-chip may obtain the rotational speed of each fan in the fan module and the temperature detected by each temperature detector in the temperature detection module. If the system-level chip detects that the rotating speed of each fan in the fan module is in the rotating speed threshold range, the fan module can be determined to be in a normal working state. If the system-level chip detects that the rotating speed of any fan in the fan module is not within the rotating speed threshold range, the fan module can be determined not to be in a normal working state. The system-in-chip may have a rotation speed threshold range stored therein.

If the system-level chip detects that the temperature detected by each temperature detector in the temperature detection module is within the temperature threshold range, the temperature detection module can be determined to be in a normal working state. If the system-on-chip detects that the temperature detected by any temperature detector in the temperature detection module is not in the temperature threshold range, the system-on-chip can determine that the temperature detection module is not in a normal working state. The system-on-chip may have a temperature threshold range stored therein.

In an embodiment of the present disclosure, the fan module may include a plurality of fans, each of which is provided with a rotation speed detector. The temperature detection module may include a plurality of temperature detectors. The laser projection device may further include a first signal selector having at least one first gate terminal, one first output terminal, and a plurality of first input terminals connected in one-to-one correspondence with the rotation speed detectors of the plurality of fans, and a second signal selector. Wherein the ith first input terminal X _i And the rotating speed detector is connected with the rotating speed detector of the ith fan, wherein i is an integer less than or equal to the total number of the fans.

The second signal selector has at least one second gate terminal, a second output terminal, and a plurality of second input terminals connected to the plurality of temperature detectors in one-to-one correspondence, the j-th second input terminal Y _j And the j is an integer less than or equal to the total number of the temperature detectors included in the temperature detection module. The at least one first gate terminal, the first output terminal, the at least one second gate terminal and the second output terminal are all connected with the system-in-chip.

The system on chip may send a first strobe signal to the at least one first strobe terminal and a second strobe signal to the at least one second strobe terminal. The first signal selector may conduct a first target input terminal of the at least one first input terminal with the first output terminal according to the first strobe signal, so as to transmit the rotation speed detected by the rotation speed detector connected with the first target input terminal to the system-in-chip through the first output terminal. The second signal selector may conduct a second target input terminal of the at least one second input terminal with the second output terminal according to the second strobe signal, so as to transmit the temperature detected by the temperature detector connected to the second target input terminal to the system-in-chip through the second output terminal.

It will be appreciated that if the first signal selector has n (n is an integer greater than 1) first strobe terminals, the first strobe signals sent by the system-in-chip to the plurality of first strobe terminals may include n level signals corresponding to the n first strobe terminals one by one, each level signal may be a high level signal or a low level signal, and the fan module may include 2 ⁿ -1 fan. Thus, the n level signals received by the first signal selector are 2 in total ⁿ The combination mode, i.e. the system-on-chip can send 2 ⁿ A different first strobe signal. The 2 ⁿ One of the different first strobe signals may be used to instruct the first signal selector not to turn on either of the first input terminals with the first output terminal, i.e., not to output the rotational speed of either of the fans. The rest 2 ⁿ Each of the 1 first gating signals may then be used to indicate that a first input is to be conducted with the first output, i.e. the rotational speed of a fan is to be output.

Alternatively, if n is 1, i.e., the first signal selector may have 1 first gate, the fan module 32 may include 2 ¹ And a fan. Referring to fig. 7, if n is 3, i.e. the first signal selector may have 3 first input terminals including the first gate terminal a, the first gate terminal B and the first gate terminal C, the fan module 32 may include the first fan F1 to the seventh fan F7 2 ³ -1 (i.e. 7) fans. The first signal selector 44 further has a first input terminal X0 connected to the ground terminal, a pin G1 connected to the ground terminal, and a pin Vc1 connected to the power terminal. The first signal selector 44 may also be referred to as a 1-out-of-8 analog signal selector.

If the second signal selector has m (m is an integer greater than 1) second strobe terminals, the second strobe signals sent by the system-in-chip to the plurality of second strobe terminals may include m level signals corresponding to the m second strobe terminals one by one, and the fan module may include 2 ^m -1 fan. Thus, the m level signals received by the second signal selector are 2 in total ^m The combination mode, i.e. the system-on-chip can send 2 ^m A second, different strobe signal. The 2 ^m One of the different second strobe signals may be used to instruct the second signal selector not to turn on either of the second input terminals with the second output terminal, i.e., not to output the temperature detected by either of the temperature detectors. The rest 2 ^m Each of the 1 second strobe signals may then be used to indicate that a second input is to be brought into conduction with the second output, i.e. to output a temperature detected by a temperature detector.

Alternatively, referring to fig. 7, if m is 1, that is, the second signal selector may have 1 second gate, the temperature detection module 33 may include a total of 2 of the first temperature detector N1 and the second temperature detector N2 ¹ And a temperature detector. The first output end Y1 is connected to the first temperature detector N1, and the first output end Y2 is connected to the second temperature detector N2. The second signal selector 45 also has a pin G2 connected to the ground terminal and a pin Vc1 connected to the power terminal, and the second signal selector 45 may also be referred to as a 2-to-1 analog signal selector.

Taking the example that the fan module includes 7 fans, the first signal selector includes three first gate terminals, table 1 shows the first gate signals sent by the system on chip 30 to the first gate terminal a, the first gate terminal B and the first gate terminal C of the first signal selector 44, and the first target input terminal and the first output terminal X turned on by the first signal selector 44 according to the first gate signals. Where 1 represents a high level signal and 0 represents a low level signal.

Referring to table 1, if the first strobe signal transmitted from the system-on-chip 30 to the first strobe terminal a, the first strobe terminal B and the first strobe terminal C is 1,0, i.e., the system-on-chip 30 transmits a high-level signal to the first strobe terminal a and a low-level signal to the first strobe terminal B and the first strobe terminal C, the first signal selector 44 turns on the first target input terminal X1 and the first output terminal X according to the first strobe signal, so as to transmit the rotation speed detected by the rotation speed detector connected to the first target input terminal X1 to the system-on-chip 30 through the first output terminal X.

If the first strobe signals sent by the system-level chip 30 to the first strobe terminal a, the first strobe terminal B and the first strobe terminal C are 0, that is, the system-level chip 30 sends low-level signals to the first strobe terminal a, the first strobe terminal B and the first strobe terminal C, the first signal selector 44 conducts the first target input terminal X0 with the first output terminal X according to the first strobe signals, and at this time, the rotation speed of any fan is not output.

TABLE 1

Referring to fig. 7, the temperature detection module 33 includes 2 temperature detectors, the second signal selector 45 includes a second gate terminal, table 2 shows a second gate signal transmitted from the system on chip 30 to the second gate terminal a of the second signal selector 45, and the second target input terminal and the second output terminal Y turned on by the second signal selector 45 according to the second gate signal.

Referring to fig. 7 and table 2, if the second strobe signal transmitted from the system-on-chip 30 to the second strobe terminal a is 0, that is, if the system-on-chip 30 transmits a low-level signal to the second strobe terminal a, the second signal selector 45 may conduct the second target input terminal Y1 with the second output terminal Y according to the second strobe signal, so as to transmit the temperature detected by the first temperature detector N1 connected to the second target input terminal Y1 to the system-on-chip 30 through the second output terminal Y.

If the first strobe signal sent by the system-on-chip 30 to the second strobe terminal a is 1, that is, the system-on-chip 30 sends a high-level signal to the second strobe terminal a, the second signal selector 45 may conduct the second target input terminal Y2 with the second output terminal Y according to the second strobe signal, so as to send the temperature detected by the second temperature detector N2 connected to the second target input terminal Y2 to the system-on-chip 30 through the second output terminal Y.

TABLE 2

Second strobe signal	A second target input end
		0	Y1
1	Y2

In an embodiment of the present disclosure, the number of fans included in the fan module may be greater than or equal to the number of temperature detectors included in the temperature detection module. The number of the at least one first gating end is greater than or equal to the number of the at least one second gating end, and the at least one second gating end can be connected with the system-in-chip through part or all of the at least one first gating end. That is, some or all of the at least one second gate and the at least one first gate may share pins of the system on chip. Accordingly, the second strobe signal sent by the system-on-chip to the at least one second strobe terminal may be part or all of the n level signals included in the first strobe signal. Therefore, when the number of fans is multiple and/or the number of temperature detectors is multiple, the number of pins required to be arranged on the system-in-chip can be effectively reduced.

Referring to fig. 8, 9 and 10, if the number of fans included in the fan module 32 is 7, the number of temperature detectors included in the temperature detection module 33 may be 2, or the number of temperature detectors included in the temperature detection module 33 may be 4, or the number of temperature detectors included in the temperature detection module 33 may be 7.

Referring to fig. 8, the fan module 32 may include 7 fans from the first fan F1 to the seventh fan F7, the temperature detection module 33 may include 2 temperature detectors from the first temperature detector N1 and the second temperature detector N2, and the first signal selector 44 may have three first gates from the first gate a, the first gate B and the first gate C, one first output X, and 7 first inputs from the first input X1 to the seventh input X7 in one-to-one correspondence with the 7 fans. The second signal selector 45 has a second gate terminal a, a second output terminal Y, and 2 second input terminals in one-to-one correspondence with the second input terminals Y1 and Y2 of the 2 temperature detectors.

The second gate terminal a is connected to the system-on-chip 30 through any one of the first gate terminal a, the first gate terminal B and the first gate terminal C, and fig. 8 shows that the second gate terminal a is connected to the system-on-chip 30 through the first gate terminal a.

Table 3 shows that the second strobe signal varies according to the first strobe signal transmitted to the first strobe terminal a. Since the second gate terminal a is connected to the system-on-chip 30 through the first gate terminal a, the first gate signal transmitted to the first gate terminal a by the system-on-chip 30 is identical to the second gate signal transmitted to the second gate terminal a.

Referring to table 3, if the first strobe signal transmitted from the system-on-chip 30 to the first strobe terminal a, the first strobe terminal B, and the first strobe terminal C is 1,0, the second strobe signal received by the second strobe terminal a is 1. At this time, the first signal selector 44 turns on the first target input terminal X1 and the first output terminal X according to the first strobe signal (1, 0) to transmit the rotation speed of the first fan F1 to the system on chip 30 through the first output terminal X. The second signal selector 45 conducts the second target input terminal Y2 with the second output terminal Y according to the second strobe signal (1) to transmit the temperature detected by the second temperature detector N2 to the system-in-chip 30 through the second output terminal Y.

TABLE 3 Table 3

In the embodiment of the present disclosure, the second gate terminal a may be connected to the system on chip 30 through the first gate terminal B. Tables 4 and 5 show that the second strobe signal changes according to the first strobe signal transmitted to the first strobe terminal B. Referring to tables 4 and 5, if the first strobe signal transmitted from the system on chip 30 to the first strobe terminal a, the first strobe terminal B and the first strobe terminal C is 1,0, the second strobe signal received by the second strobe terminal a is 0. The second signal selector 45 thus turns on the first target input terminal Y1 and the second output terminal Y according to the second strobe signal (0) to transmit the temperature detected by the first temperature detector N1 to the system-in-chip 30 through the second output terminal Y.

TABLE 4 Table 4

TABLE 5

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Referring to fig. 9, the temperature detection module 33 may include four temperature detectors in total of the first to fourth temperature detectors N1 to N4. The second signal selector has two second gate terminals, namely a second gate terminal a and a second gate terminal b, a second output terminal Y, and 4 second input terminals, namely second input terminals Y1 to fourth input terminals Y4, which are in one-to-one correspondence with the four temperature detectors. The second signal selector may be referred to as a 4-to-1 analog signal selector.

The second gate terminal a and the second gate terminal B are connected to the system-on-chip 30 through two first gate terminals of the first gate terminal a, the first gate terminal B and the first gate terminal C, fig. 9 shows that the second gate terminal a is connected to the system-on-chip 30 through the first gate terminal a, the second gate terminal B is connected to the system-on-chip 30 through the first gate terminal B, and then the second gate signal received by the second gate terminal a is the same as the first gate signal received by the first gate terminal a, and the second gate signal received by the second gate terminal B is the same as the first gate signal received by the first gate terminal B.

Table 6 shows that the second strobe signal varies according to the first strobe signal transmitted to the first strobe terminal a and the first strobe terminal B. Referring to table 6, if the first strobe signal transmitted by the system-on-chip 30 to the first strobe terminal a, the first strobe terminal B, and the first strobe terminal C is 1,0, the second strobe signal received by the second strobe terminal a is 1, and the second strobe signal received by the second strobe terminal B is 0. At this time, the second signal selector 45 turns on the second target input terminal Y2 and the second output terminal Y according to the second strobe signal (1, 0) to transmit the temperature detected by the second temperature detector N2 to the system on chip 30 through the second output terminal Y.

TABLE 6

Referring to fig. 10, the temperature detection module 33 may include 7 temperature detectors in total from the first temperature detector N1 to the seventh temperature detector N7. The second signal selector 45 has 3 second gate terminals a, b and c, and 7 second input terminals Y1 to Y7 corresponding to the 7 temperature detectors. The second signal selector 45 may further have a second input terminal G3 connected to the ground terminal and a pin G4 connected to the ground terminal. The second signal selector may be referred to as a 1-out-of-8 analog signal selector.

The three second gates are connected to the system-on-chip 30 through three first gates, fig. 10 shows that the second gate a is connected to the system-on-chip 30 through the first gate a, the second gate B is connected to the system-on-chip 30 through the first gate B, and the second gate C is connected to the system-on-chip 30 through the first gate C. Therefore, the second strobe signal received by the second strobe terminal a is the same as the first strobe signal received by the first strobe terminal a, the second strobe signal received by the second strobe terminal B is the same as the first strobe signal received by the first strobe terminal B, and the second strobe signal received by the second strobe terminal C is the same as the first strobe signal received by the first strobe terminal C.

Table 7 shows that the second strobe signal varies according to the first strobe signals transmitted to the first strobe terminal a, the first strobe terminal B, and the first strobe terminal C. Referring to fig. 10 and table 7, if the first strobe signals transmitted from the system-on-chip 30 to the first strobe terminals a, B and C are 1,0, the second strobe signal received by the second strobe terminal a is 1, the second strobe signal received by the second strobe terminal B is 0, and the second strobe signal received by the second strobe terminal C is 0. The second signal selector 45 may thus turn on the first target input terminal Y1 and the second output terminal Y according to the second strobe signal (1, 0) to transmit the temperature detected by the first temperature detector N1 to the system-in-chip 30 through the second output terminal Y.

TABLE 7

In the embodiment of the disclosure, the system-on-chip may send the target number of first gating signals to at least one first gating end every a target duration, and send the target number of second gating signals to at least one second gating end every a target duration. Thereby realizing the polling detection of the rotational speeds of the plurality of fans and the polling detection of the temperatures detected by the plurality of temperature detectors. Referring to tables 3 to 7, the target time period may be 3 seconds or more and 5 seconds or less. Referring to tables 3 and 4, the target number may be 2. Referring to tables 5 and 6, the target number may be 4. Referring to table 7, the target number may be 8.

Referring to fig. 11, the first signal selector 44 and the second signal selector 45 may be located on the display panel 301, and the system on chip 30 may transmit a first gate signal to at least one first gate terminal of the first signal selector 44 and may receive a rotational speed of the fan output from the first signal selector 44 through the first output terminal. The system on chip 30 may transmit the second strobe signal to at least one second strobe terminal of the second signal selector 45 and may receive the temperature detected by the temperature detector output from the second signal selector 45 through the second output terminal.

In contrast to the system-on-chip connection directly to a plurality of fans, the rotational speed of each fan is obtained. And the system-in-chip is directly connected with the plurality of temperature detectors to acquire the temperature detected by each temperature detector. In the embodiment of the disclosure, the system-on-chip 30 obtains the rotation speeds of the plurality of fans and the temperatures detected by the plurality of temperature detectors through the first signal selector 44 and the second signal selector 45, so that the number of pins required to be set on the system-on-chip is effectively reduced.

It is assumed that the fan module includes 7 fans, the temperature detection module includes 2 temperature detectors, and compared with the system-in-chip which needs to be provided with 7 pins (the pins are interrupts) connected with the 7 fans, the 7 pins are interrupts, and the interrupts are used for receiving the rotation speed of the fans. The 2 pins are connected to 2 temperature detectors, and the 2 pins are an AD (analog digital) port for converting a received analog signal into a digital signal. Referring to fig. 8, in the embodiment of the present disclosure, only five pins are required to be disposed on the system on chip 30 by disposing the first signal selector 44 and the second signal selector 45, thereby saving two pins. Three pins of the five pins are used for being connected with three first strobe terminals and at least one second strobe terminal, and each of the three pins can be a general purpose input/output (general purpose input/output, GPIO). The other two pins of the five pins are used for being connected with the first output end of the first signal selector 44 and the second output end of the second signal selector 45, the pin used for being connected with the first output end of the other two pins is an interrupt, and the pin used for being connected with the second output end is an AD port. Thus, the use of 6 interrupt ports and 1 AD port is reduced on the system-in-chip, and the number of interrupt ports and AD ports which are required to be arranged on the system-in-chip is saved.

In another alternative implementation of the disclosed embodiments, if the fan module includes a fan, the system on chip may be connected to a rotational speed detector of the fan and obtain the rotational speed of the fan from the rotational speed detector. If the temperature detection module comprises a temperature detector, the system-in-chip can be connected with the temperature detector and acquire the temperature detected by the temperature detector from the temperature detector.

In the embodiment of the disclosure, if the light source is a three-color laser light source, the system-on-chip may further detect whether the diffusion wheel is in a normal working state. If the fan module, the temperature detection module and the diffusion wheel are in the normal working state, a power supply instruction can be sent to the light valve control assembly. If any component of the fan module, the temperature detection module and the diffusion wheel is not in a normal working state, a power supply instruction is not required to be sent to the light valve control component, and alarm information can be sent.

Optionally, the system-in-chip may acquire the rotation speed of the diffusion wheel, and if the rotation speed of the diffusion wheel is detected to be within the target threshold range, it may be determined that the diffusion wheel is in a normal working state. If the system-level chip detects that the rotation speed of the diffusion wheel is not within the rotation speed threshold range, the diffusion wheel can be determined to be not in a normal working state. The target threshold range may be stored in the system-in-chip in advance.

Step 506, after the light valve control component is powered on, the light valve power supply component is controlled to supply power to the light valve in response to the power supply instruction.

After the light valve control assembly is powered on, the light valve power supply assembly can be controlled to supply power to the light valve in response to the power supply instruction. Optionally, the light valve control component may send an enable signal with an active level to the light valve power supply component in response to the power supply command, and the light valve power supply component may supply power to the light valve under control of the enable signal with the active level.

In the embodiment of the disclosure, the light valve power supply assembly may sequentially send two active power signals, a Voltage Bias (VBIAS) signal, a Voltage Reset (VRST) signal and a Voltage Offset (VOFS) signal to the light valve, thereby implementing power-up of the light valve. The voltage of the two effective power supply signals, the voltage of the voltage bias signal, the voltage of the voltage reset signal and the voltage of the voltage compensation signal are different. For example, the voltages of the two power supply signals may be 1.15V and 1.8V, respectively. The voltage of the voltage bias signal may be 18V, the voltage of the voltage reset signal may be-14V, and the voltage of the voltage compensation signal may be 10V.

Referring to fig. 6, the laser projection device may further include a socket 46, the socket 46 being connected to the light valve power supply assembly 35 and the light valve 37, respectively, and the socket 46 being located on the display panel 301. The light valve power assembly 35 may send two active power signals, a voltage bias signal, a voltage reset signal, and a voltage compensation signal to the light valve 37 in sequence through the receptacle 46.

In step 507, after the system-on-chip determines that the light valve is successfully powered on, the power panel is controlled to supply power to the light source driving assembly so as to drive the light source to emit light beams.

After the system-level chip determines that the light valve is successfully powered on, the power panel can be controlled to supply power for the light source driving assembly, so that the light source driving assembly drives the light source to emit light beams. Optionally, the light valve control component may send a first acknowledgement signal to the system-on-chip after controlling the light valve power supply component to supply power to the light valve, and the system-on-chip may determine that the light valve is powered up successfully after receiving the first acknowledgement signal. Referring to fig. 6, the light valve control assembly 34 may send a first acknowledgement signal to the system on chip via the I2C (inter integrated circuit) bus.

In the embodiment of the disclosure, the system-on-chip may also send the projected image to the light valve control assembly after determining that the light valve is powered up successfully. And the light valve control assembly can send a third control signal to the light source driving assembly after receiving the projection image, and the light source driving assembly is controlled by the third control signal to drive the light source to emit light beams after being electrified, wherein the third control signal can comprise an enabling signal and a current control signal, and the current control signal can be a PWM signal.

Alternatively, the system on chip may send each frame of projection image, which may have a resolution of 4K, to the light valve control assembly in the form of a VX1 signal at a frequency of 60 Hertz (HZ). If the light source is a three-color laser light source, the third control signal may include an enable signal corresponding to three primary colors of the projected image one by one and a current control signal corresponding to three primary colors of the projected image one by one. The light source control assembly may drive a light source outgoing light beam outgoing the primary color light beam based on the enable signal and the current control signal of each primary color.

Referring to fig. 6, the laser projection device may further include a second power switch S2, and a control terminal of the second power switch S2 is connected to the system-on-chip 30. The first end of the second power switch S2 is connected to the power board 31, and the second end of the second power switch S2 is connected to the light source driving assembly 36. The system-in-chip 30 may output an enable signal of an active level to the control terminal of the second power switch S2 in response to the power-on command, so that the first terminal and the second terminal of the second power switch S2 are turned on, thereby implementing control of the power panel 31 to supply power to the light source driving assembly 36.

Referring to fig. 12, the power-on process of the laser projection device may include the steps of:

step 1201, system on chip power up.

Step 1202, the system on chip is powered up and then the fan module, the light valve control assembly and the light valve power supply assembly are controlled to be powered up.

Step 1203, after the light valve control component is powered on, a first control signal is output to the fan module.

Step 1204, the system-in-chip detects whether the fan module and the temperature detection module are in a normal working state, determines whether to start a human eye protection function based on a signal detected by the human eye protection component, and outputs a second control signal to the diffusion wheel.

In step 1205, after the system-on-chip determines that the fan module and the temperature detection module are in a normal working state, the light valve control assembly controls the light valve to be powered on.

In step 1206, the light valve control assembly outputs a third control signal to the light source control assembly.

In step 1207, the system on chip controls the light source control assembly to power up after determining that the light valve is powered up, so as to drive the light source to emit a light beam.

In embodiments of the present disclosure, the system-on-chip also detects whether the eye protection assembly is connected to the system-on-chip in response to the detection instruction during maintenance of the internal components of the laser projection device.

In the disclosed embodiment, each fan also has a ground. Referring to fig. 7 to 10, the first fan F1 has a ground g1, the second fan F2 has a ground g2, the third fan F3 has a ground g3, the fourth fan F4 has a ground g4, the fifth fan F5 has a ground g5, the sixth fan F6 has a ground g6, and the seventh fan F7 has a ground g7.

In the embodiment of the disclosure, after receiving the projection image sent by the system-in-chip, the light valve control component may generate a light valve control signal according to the primary color gradation values of the pixels in the projection image, and send the light valve control signal to the light valve. Referring to fig. 6, the socket 46 is also coupled to the light valve control assembly 34, and the light valve control assembly 34 may send a light valve control signal to the light valve 37 through the socket 46. The light valve modulates the light beam irradiated by the light source to the surface of the light valve into an image light beam under the control of the light valve control signal, and transmits the image light beam to the projection lens. The projection lens is used for projecting the image light beam transmitted by the light valve to a projection screen, thereby realizing projection display of the projection image to the projection screen.

Referring to fig. 6, the laser projection device may further include a galvanometer 47, with the galvanometer 47 being coupled to the light valve control assembly 34. Under the condition that the resolution of the projection image is larger than that of the light valve, the vibrating mirror can shift the multi-frame sub-images to different positions of the projection screen so as to realize the superposition display of the multi-frame sub-images and further realize the display of the projection image, thereby achieving the effect of expanding the resolution of the light valve.

After receiving the projection image sent by the system-in-chip, the light valve control component can divide the projection image into multiple sub-images if the resolution of the projection image is greater than that of the light valve. For each frame of sub-image, the light valve control component can control the light source driving component to drive the light source to emit light beams, and in the process that the light beams emitted by the light source are irradiated to the light valve, the light valve is controlled to modulate the illumination light beams irradiated to the surface of the light valve according to the frame of sub-image, and the light valve is controlled to transmit the modulated image light beams to the galvanometer. The galvanometer is used for transmitting the image light beam transmitted by the light valve to the projection lens. The projection lens is used for projecting the image light beam transmitted by the vibrating mirror to the projection screen, so that multiple frames of sub-images are sequentially projected and displayed on the projection screen, and further, high-resolution projection images are projected and displayed through the low-resolution light valve.

In the process of projecting and displaying each frame of sub-image, the light valve control component can transmit the galvanometer driving current control corresponding to one frame of sub-image to the galvanometer so as to drive the polarization of the galvanometer. The driving current directions of the vibrating mirrors corresponding to the different frame sub-images are different, so that the multi-frame sub-images can be projected to different positions of the projection screen, and further the superposition display of the multi-frame sub-images can be realized. In addition, in the process of projection display of multiple frames of sub-images, the current direction of the galvanometer driving current can be changed alternately, and the changing waveform of the galvanometer driving current can be a sine wave.

Referring to fig. 6, the laser projection device may include a digital-to-analog converter (digital to analog converter, DAC) 48, the digital-to-analog converter 48 being respectively connected to the light valve control assembly 34 and the galvanometer 47, the digital-to-analog converter 48 being configured to convert the galvanometer drive current transmitted by the light valve control assembly 34 from a digital signal to an analog signal, and transmit the converted analog signal to the galvanometer 47.

The light valve control assembly 34 may also direct mirror control commands to the mirrors via the I2C bus based on the sensed temperature of the mirrors, which may be used to adjust the angle of the mirrors, etc.

Referring to fig. 6, the system on chip 30 may also send correction data to the light valve control assembly 34 via a USB bus. The laser projection device may include a memory 49, the memory 49 may be a charged erasable programmable read only memory (electrically erasable programmable read only memory, EEPROM), and the light valve control assembly 34 may send the correction data to the memory 49 via the I2C bus to cause the memory 49 to store the correction data. The correction data may be used to correct the projection position or the projection shape of the projection image. The light valve control assembly 34 may correct the projection position or the projection shape of the projection image based on the correction data.

In summary, the embodiments of the present disclosure provide a control method for a laser projection device, where a system-on-chip may directly control a power board to supply power to a fan module, a light valve control assembly, a light valve power supply assembly, and a light source driving assembly in response to a power-on instruction, and supply power to a temperature detection module. Because the system-level chip does not need to control each component to be electrified through a main control circuit on the display panel, the starting-up process is simplified, the starting-up time of the laser projection equipment is shortened, and the user experience is good.

And because the main control circuit on the display panel is not required to control the power-on of each component, the main control circuit and related components (such as a fan module, a temperature detection module, a diffusion wheel and an eye protection component) controlled by the main control circuit are not required to be arranged on the display panel, so that the circuit on the display panel is simplified, the size of the display panel is reduced, and the size of the laser projection equipment is further reduced.

Referring to fig. 13, the standby process of the laser projection device may include the steps of:

step 1301, the system level chip responds to the standby operation and sends a standby instruction to the main control circuit.

In step 1302, the main control circuit responds to the standby instruction to control the light source driving circuit to be powered off so as to turn off the light source.

Step 1303, the main control circuit sends a standby instruction to the display control circuit.

In step 1304, the display control circuit controls the light valve to power down in response to the standby instruction.

Step 1305, the main control circuit controls the display control circuit to be powered off after the light valve is powered off.

Step 1306, after the display control circuit is powered off, the main control circuit controls the fan, the temperature detector, the human eye protection component and the diffusion wheel to be powered off.

Step 1307, the system-on-chip controls the main control circuit to power off after the fan, the temperature detector, the eye protection component and the diffusion wheel are powered off.

Step 1308, the system-on-chip enters a standby state.

Fig. 14 is a flowchart of another control method of a laser projection device according to an embodiment of the present disclosure, which may be applied to the laser projection device shown in fig. 3. As shown in fig. 4, the method includes:

in step 1401, the system-in-chip responds to the standby operation, sends a standby instruction to the light valve control component, and controls the power panel to stop supplying power to the light source driving component so as to stop the light source from emitting light beams.

The system-in-chip can respond to the standby operation, send a standby instruction to the light valve control assembly, and control the power panel to stop supplying power to the light source driving assembly so as to stop the light source from emitting light beams. Wherein the standby operation may be a selected operation for a standby button or the shutdown button. The standby button and the shutdown button can be located on the laser projection device or on a remote controller for controlling the laser projection device.

Referring to fig. 6, the system-on-chip 30 may output an enable signal of an inactive level to the control terminal of the second power switch S2 in response to a standby operation to disconnect the first terminal from the second terminal of the second power switch S2, thereby implementing control of the power panel 31 to stop supplying power to the light source driving assembly 36. Wherein the inactive level may be a low level.

In the embodiment of the disclosure, the system-in-chip may send an inactive level signal to the power supply circuit in response to the standby operation, and send a standby signal to the power supply circuit through the power panel, and the power supply circuit may send an inactive level power normal signal, an inactive level power sense signal, a first inactive power signal, a second inactive power signal, a third inactive power signal, and a fourth inactive power signal to the light valve control assembly in sequence in response to the standby signal. The standby instruction may include a power normal signal of an inactive level, a power sense signal of an inactive level, a first inactive power signal, a second inactive power signal, a third inactive power signal, and a fourth inactive power signal. The voltages of the low level signal, the power normal signal of the inactive level, the power sense signal of the inactive level, the first inactive power signal, the second inactive power signal, the third inactive power signal, and the fourth inactive power signal may all be 0V.

In step 1402, the light valve control module responds to the standby command to control the light valve power supply module to stop supplying power to the light valve.

The light valve control assembly may send an enable signal of an inactive level to the light valve power assembly in response to the standby instruction, thereby causing the light valve power assembly to cease powering the light valve.

Alternatively, the light valve may be a digital micromirror device (digital micromirror device, DMD) having a plurality of mirrors integrated therein, each mirror corresponding to one pixel in the projected image. The deflection angles of the lenses in the DMD are different, so that light rays of different pixels can be projected to different positions, and the display of a projection image is realized.

After receiving the power normal signal of the invalid level, the light valve control chip can control the lenses on the light valve to be in a static state, namely, the control of the lenses to turn over (at the moment, the projection image displayed on the projection screen is kept unchanged), so that the current deflection angles of the lenses are kept unchanged. Therefore, collision of two adjacent lenses is avoided, and mechanical damage to the mirror surfaces of the two adjacent lenses is avoided.

The light valve control chip can control the lenses to restore to the initial state before the lenses are controlled to be in a static state and the power supply induction signals of invalid level are not received, and in the initial state, the deflection angle of the lenses is 0, and at the moment, the lenses do not project projection images to the projection screen. The light valve control chip can send an invalid enabling signal to the light valve power supply chip, and the light valve power supply chip stops supplying power to the light valve under the control of the invalid enabling signal, so that the light valve is powered down. The level of the disable enable signal may be 0V.

Step 1403, after determining that the light valve is powered down successfully, the system-on-chip controls the power board to stop supplying power to the fan module, the light valve control assembly and the light valve power supply assembly, and stops supplying power to the temperature detection module.

After the system-level chip determines that the light valve is powered down successfully, the power panel can be controlled to stop supplying power to the fan module, the light valve control assembly and the light valve power supply assembly, and the power supply to the temperature detection module can be stopped.

The light valve control component can send a second confirmation signal to the system-in-chip after controlling the light valve power supply component to stop supplying power to the light valve, wherein the second confirmation signal is used for indicating the light valve to be powered down. After receiving the second confirmation signal, the system-on-chip can determine that the light valve is powered down successfully.

In the embodiment of the disclosure, the power supply circuit may realize controlling the light valve control assembly to be powered down after sending the fourth invalid power signal to the light valve control assembly.

Referring to fig. 6, after determining that the light valve is powered down successfully, the system-in-chip 30 may output an enable signal with an inactive level to the control terminal of the first power switch S1, so that the first terminal and the second terminal of the first power switch S1 are disconnected, thereby implementing that the control power board 31 stops supplying power to the power supply circuit 42, the light valve control assembly 34 and the light valve power supply assembly 35. In addition, after determining that the light valve is powered down successfully, the system-level chip 30 may also output an enable signal with an invalid level to the control end of the power switch module 41, so that the first end and the second end of the power switch module 41 are disconnected, thereby implementing control of the power panel 31 to stop supplying power to the fan module 32.

In the embodiment of the present disclosure, if the fan module 32 includes a plurality of fans, the system on chip 30 may send an enable signal of an inactive level to each switch circuit after determining that the light valve is powered down successfully, so as to disconnect the first end and the second end of the switch circuit, thereby stopping the power board 31 from powering one fan connected to the switch circuit.

The system-level chip stops supplying power to the fan module, the light valve control assembly and the light valve power supply assembly when the control power board is used for controlling the power supply board, and can stop supplying power to the temperature detection module. In the embodiment of the disclosure, the system-on-chip may also stop supplying power to the eye protection component after determining that the light valve is powered down successfully. If the light source is a three-color laser light source, the system-on-chip can stop supplying power to the human eye protection component after the successful power-down of the light valve is determined.

In the embodiment of the disclosure, after the power panel is controlled to stop supplying power to the fan module, the light valve control assembly and the light valve power supply assembly, the system-level chip can be controlled to stop supplying power to other circuits in the system-level chip, so that the other circuits stop supplying power to the temperature detection module after power is off.

In an embodiment of the present disclosure, the standby process of the laser projection device may include the steps of:

Step 1501, the system in chip sends a standby instruction to the light valve control assembly in response to the standby operation.

In step 1502, the system on chip controls the light source driving assembly to power down to turn off the light source.

In step 1503, the light valve control component controls the light valve to power down in response to the standby command.

Step 1504, the system-in-chip controls the fan, the temperature detection module, the eye protection assembly and the diffusion wheel to be powered down after determining that the power-down of the light valve is successful.

In step 1505, the system on chip controls the power-down of the light valve power supply assembly.

Step 1506, the system-on-chip enters a standby state.

In summary, the embodiments of the present disclosure provide a control method for a laser projection device, where a system-on-chip may directly control a power board to power off a fan module, a light valve control assembly, a light valve power supply assembly, and a light source driving assembly in response to a standby operation, and stop supplying power to a temperature detection module. Because the system-level chip does not need to control each component to be powered down through the main control circuit on the display panel, the standby process is simplified, the standby time of the laser projection equipment is shortened, the control process of the laser projection equipment is further simplified, and the user experience is good.

In addition, as the main control circuit on the display panel is not required to control each component to be powered down, the main control circuit and related components (such as a fan module and a temperature detection module) controlled by the main control circuit are not required to be arranged on the display panel, so that the circuit on the display panel is simplified, the size of the display panel is reduced, the size of the laser projection equipment is further reduced, and the cost is reduced.

The disclosed embodiments provide a laser projection device, as shown in fig. 3 and fig. 1 to 11, in which a system-in-chip 30 is configured to respond to a power-on command, control a power board 31 to supply power to a fan module 32, a light valve control assembly 34 and a light valve power supply assembly 35, and supply power to a temperature detection module 33.

The light valve control assembly 34 is configured to control the light valve power assembly 35 to power the light valve 37 upon power-up.

The system-in-chip 30 is further configured to control the power board 31 to supply power to the light source driving component 36 to drive the light source 38 to emit a light beam after determining that the light valve 37 is successfully powered.

In summary, the embodiments of the present disclosure provide a laser projection device, where a system-on-chip in the laser projection device may directly control a power board to supply power to a fan module, a light valve control assembly, a light valve power supply assembly, and a light source driving assembly in response to a power-on instruction, and supply power to a temperature detection module. Because the system-level chip does not need to control each component to be electrified through a main control circuit on the display panel, the starting-up process is simplified, the starting-up time of the laser projection equipment is shortened, and the user experience is good.

Embodiments of the present disclosure provide a laser projection device in which a system-on-chip is configured to send a standby instruction to the light valve control assembly 34 in response to a standby operation, and to control the power panel to stop supplying power to the light source drive assembly 36 to stop the light source 38 from emitting a light beam.

The light valve control assembly 34 is configured to control the light valve power supply assembly 35 to stop supplying power to the light valve 37 in response to the standby instruction.

The system-in-chip 30 is further configured to control the power panel to stop supplying power to the fan module 32, the light valve control assembly 34, and the light valve power assembly 35, and stop supplying power to the temperature detection module 33 after determining that the light valve 37 is powered down successfully.

In summary, the embodiments of the present disclosure provide a laser projection device, where a system-on-chip in the laser projection device may directly control a power board to power off a fan module, a light valve control assembly, a light valve power supply assembly, and a light source driving assembly in response to a standby operation, and stop supplying power to a temperature detection module. Because the system-level chip does not need to control each component to be powered down through the main control circuit on the display panel, the standby flow is simplified, the standby time of the laser projection equipment is shortened, and the user experience is good.

In addition, as the main control circuit on the display panel is not required to control each component to be powered down, the main control circuit and related components (such as a fan module, a temperature detection module, a diffusion wheel and an eye protection component) controlled by the main control circuit are not required to be arranged on the display panel, so that the circuit on the display panel is simplified, the size of the display panel is reduced, and the size of the laser projection equipment is further reduced.

The disclosed embodiments provide a laser projection apparatus including: a memory, a processor and a computer program stored on the memory, which when executed by the processor implements the method embodiments described above (e.g., the embodiments of fig. 4, 5, 12, 14, or 15).

The disclosed embodiments provide a computer readable storage medium having instructions stored therein that are loaded and executed by a processor to implement the method embodiments (e.g., the embodiments of fig. 4, 5, 12, 14, or 15) described above.

The disclosed embodiments provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method embodiments described above (e.g., the embodiments of fig. 4, 5, 12, 14, or 15).

In the presently disclosed embodiments, the terms "first," "second," "third," "fourth," "fifth," "sixth," and "seventh" 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 foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.

Claims

1. The control method of the laser projection equipment is characterized in that the laser projection equipment comprises a system-level chip, a power panel, a fan module, a temperature detection module, a light valve control assembly, a light valve power supply assembly, a light source driving assembly and a light source; the method comprises the following steps:

2. The method of claim 1, wherein the system on chip, after controlling the power board to power the fan module, the light valve control assembly, and the light valve power assembly in response to a power-on command, and to power the temperature detection module, further comprises:

if the system-level chip determines that the fan module and the temperature detection module are in a normal working state, a power supply instruction is sent to the light valve control assembly;

after the light valve control assembly is powered on, the light valve power supply assembly is controlled to supply power to the light valve, and the light valve control assembly comprises:

and after the light valve control assembly is powered on, responding to the power supply instruction, and controlling the light valve power supply assembly to supply power for the light valve.

3. The method of claim 2, wherein the fan module comprises at least one fan and the temperature detection module comprises at least one temperature detector; the method further comprises the steps of:

if the system-level chip detects that the rotating speed of each fan in the fan module is in the rotating speed threshold range, the fan module is determined to be in a normal working state;

And if the system-on-chip detects that the temperature detected by each temperature detector in the temperature detection module is within the temperature threshold range, determining that the temperature detection module is in a normal working state.

4. The method of claim 3, wherein the fan module comprises a plurality of fans and the temperature detection module comprises a plurality of temperature detectors; the laser projection device further includes: the first signal selector is provided with at least one first gating end, one first output end and a plurality of first input ends which are connected with the rotating speed detectors of the fans in a one-to-one correspondence manner; the second signal selector is provided with at least one second gating end, one second output end and a plurality of second input ends which are connected with the plurality of temperature detectors in a one-to-one correspondence manner; the system-on-chip comprises at least one first gating end, at least one first output end, at least one second gating end and at least one second output end, wherein the at least one first gating end, the first output end, the at least one second gating end and the second output end are all connected with the system-on-chip;

the method further comprises the steps of:

the system-in-chip sends a first gating signal to the at least one first gating end and sends a second gating signal to the at least one second gating end;

The first signal selector conducts a first target input end of the at least one first input end with the first output end according to the first gating signal so as to send the rotating speed detected by the rotating speed detector connected with the first target input end to the system-in-chip through the first output end;

and the second signal selector conducts a second target input end of the at least one second input end with the second output end according to the second gating signal so as to send the temperature detected by the temperature detector connected with the second target input end to the system-in-chip through the second output end.

5. The method of claim 2, wherein the system on chip, in response to a power-on command, controls the power board to power the fan module, the light valve control assembly, and the light valve power assembly, and further comprising, after powering the temperature detection module:

the light valve control assembly outputs a first control signal to the fan module after being electrified;

the fan module rotates under the control of the first control signal.

6. The method of any one of claims 1 to 5, wherein the light source is a trichromatic laser light source, the laser projection device further comprising: a diffusion wheel connected to the system-on-chip; the method further comprises the steps of:

The system-on-chip responds to a starting instruction, supplies power to the diffusion wheel and outputs a second control signal to the diffusion wheel;

the diffusion wheel rotates under the control of the second control signal.

7. The method of any one of claims 1 to 5, wherein the laser projection device further comprises: a human eye protection assembly connected with the system-in-chip; the method further comprises the steps of:

the system-level chip responds to a starting instruction to supply power to the human eye protection component and determines whether to start a human eye protection function or not based on a signal fed back by a detection target object of the human eye protection component;

the system-on-chip detects whether the eye protection component is connected with the system-on-chip in response to a detection instruction.

8. The control method of the laser projection equipment is characterized in that the laser projection equipment comprises a system-level chip, a power panel, a light valve control assembly, a light source driving assembly, a light source, a light valve power supply assembly, a fan module and a temperature detection module; the method comprises the following steps:

9. The laser projection equipment is characterized by comprising a system-level chip, a power panel, a fan module, a temperature detection module, a light valve control assembly, a light valve power supply assembly, a light source driving assembly and a light source;

10. The laser projection device is characterized by comprising a system-in-chip, a power panel, a light valve control assembly, a light source driving assembly, a light source, a light valve power supply assembly, a fan module and a temperature detection module;