CN212381319U - Projector control circuit integrated in all-in-one machine, all-in-one machine and projection system - Google Patents

Abstract

The utility model discloses a projector control circuit integrated in an all-in-one machine, the all-in-one machine and a projection system, wherein the control circuit is arranged on a terminal device; the control circuit includes: switch module, micro-control chip and the interface unit of signal connection in proper order, wherein: the switch module is provided with a screen-off switch, the screen-on electric signal is a signal for turning on the projector light source, and the screen-off electric signal is a signal for turning off the projector light source; the micro-control chip responds to the screen switching electric signal output by the switch module, and converts the screen switching electric signal into an electric signal which can be identified by the interface unit to obtain a converted electric signal; the interface unit is used for being connected to a corresponding interface of the projector through a data line; and the converted electric signal is transmitted to an interface corresponding to the projector so as to switch the on-off state of the bright screen or the dark screen of the projector. The repeated restarting frequency of the projector can be reduced, and the service life of the projector is prolonged. The method is simple to use, convenient and fast, and improves user experience.

Description

Projector control circuit integrated in all-in-one machine, all-in-one machine and projection system

Technical Field

The utility model relates to an interactive technical field of all-in-one projection, concretely relates to projecting apparatus control circuit, all-in-one and projection system integrated in all-in-one.

Background

With the rapid development of the technology, the intelligent all-in-one machine (commonly called as a white board) is more and more popular and widely applied to families, offices, schools, entertainment places and the like. In order to better show the displayed graphics and texts, a projector is usually used for data display.

When the projector is used, the related control operations, such as screen turning, switching, brightness adjustment, etc., need to be performed through the remote controller or the keys on the projector. When not using projection equipment to the short time, can close the bulb through the screen function of breathing out, reduce the projecting apparatus and use the consumption, when extension projecting apparatus bulb life-span, latency overlength problem when avoiding directly closing the system and leading to restarting again avoids projecting apparatus equipment to shut down repeatedly simultaneously and restarts, can prolong the life of whole equipment. Generally, the projector is installed at a high position, and thus, it is inconvenient for a user to directly perform a key operation; in addition, in the course of teaching or meeting, the user searches for the remote controller to delay time, and delays the time of teaching and meeting.

Therefore, how to conveniently perform screen turning operation on the projector to improve user experience becomes a technical problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

Based on above-mentioned current situation, the utility model discloses a main aim at provides an integrate in projector control circuit, all-in-one and projection system of all-in-one to realize conveniently having improved user experience to the projector screen operation of putting.

In order to achieve the above object, the utility model adopts the following technical scheme:

in a first aspect, the embodiment of the utility model discloses a projector control circuit integrated in an integrated machine, the integrated machine is equipped with a terminal device, the terminal device is used for performing key control operation on the integrated machine, and the projector control circuit is arranged on the terminal device; the control circuit includes: switch module, micro-control chip and the interface unit of signal connection in proper order, wherein: the switch module is provided with a screen-off switch which is used for switching and outputting a screen-off switching electric signal for showing screen lightening or screen off under the triggering of a user; the screen-on electric signal is a signal for turning on a projector light source, and the screen-off electric signal is a signal for turning off the projector light source; the micro-control chip responds to the screen switching electric signal output by the switch module, and converts the screen switching electric signal into an electric signal which can be identified by the interface unit to obtain a converted electric signal; the interface unit is used for being connected to a corresponding interface of the projector through a data line; the converted electric signal is transmitted to an interface corresponding to the projector through the interface unit and the data line in sequence so as to switch the on-off state of the bright screen or the off-off state of the bright screen of the projector.

Optionally, the switch module is connected to the micro-control chip through a GPIO port; when the screen-off switch is not triggered, the GPIO port connected with the screen-off switch outputs a first level to the micro-control chip; when the screen-off switch is triggered, the GPIO port connected with the screen-off switch outputs a second level to the micro-control chip, wherein one of the first level and the second level is a high level, and the other level is a low level; the screen switching electric signal comprises a hopping signal and a continuous signal, wherein the hopping signal is a signal which hops from a first level to a second level in a short time, and the continuous signal is a signal which maintains the second level in a long time; and the micro control chip responds to the jumping signal or the continuous signal and converts the jumping signal into a bright screen control signal so that the projector works in a bright screen state, or converts the continuous signal into a dark screen control signal so that the projector works in a dark screen state.

Optionally, the switch module further comprises: the first functional switch and the second functional switch are respectively connected to the micro-control chip through GPIO ports; the first function switch and the second function switch are both switch keys which are arranged on the terminal equipment and are used for controlling the functions of the all-in-one machine; when the first functional switch is not triggered, the GPIO port connected with the first functional switch outputs a first level to the micro-control chip; when the first functional switch is triggered, the GPIO port connected with the first functional switch outputs a second level to the micro-control chip; when the second functional switch is not triggered, the GPIO port connected with the second functional switch outputs a first level to the micro-control chip; when the second function switch is triggered, the GPIO port connected with the second function switch outputs a second level to the micro-control chip; the micro control chip responds to the continuous signal and the level switching signal of the first function switch and outputs a brightness enhancement control signal so as to enhance the working brightness of the projector; the micro control chip responds to the continuous signal and the level switching signal of the second function switch and outputs a brightness reduction control signal to reduce the working brightness of the projector.

Optionally, the method further comprises: the micro control chip responds to the continuous signal and the continuously output second level signal of the first function switch and outputs a brightness continuous enhancement control signal to continuously enhance the working brightness of the projector; the micro control chip responds to the continuous signal and the continuously output second level signal of the second function switch and outputs a brightness continuous weakening control signal to continuously weaken the working brightness of the projector.

Alternatively, the first function switch and the second function switch are switch keys of volume up and volume down, respectively.

Optionally, the switch module further comprises: and the micro-control chip responds to a power supply turn-off signal output by the power supply switch and outputs a turn-off control signal to the projector so as to cut off the working power supply of the projector.

Optionally, the method further comprises: and one end of each pull-up resistor is connected to the power supply, and the other end of each pull-up resistor is connected to the connecting end of the switch module and the GPIO port respectively.

Optionally, the interface unit is a UART serial port or a USB interface.

In a second aspect, the embodiment of the utility model discloses an all-in-one machine, include: the display device is used for achieving key control operation, the display device is used for achieving a display function, and the projector control circuit disclosed by the first aspect is arranged on the terminal device.

In a third aspect, an embodiment of the present invention discloses a projection system, including:

a projector; and the all-in-one machine disclosed in the second aspect; the projector is in signal connection with the all-in-one machine through a multimedia interface so as to receive and project image data sent by the all-in-one machine; and the terminal equipment in the all-in-one machine is also connected to the projector through the interface unit.

[ PROBLEMS ] the present invention

According to the embodiment of the utility model discloses a projector control circuit, all-in-one and projection system integrated in all-in-one, projector control circuit sets up on terminal equipment, and control circuit includes: the switch module, micro-control chip and the interface unit that signal connection in proper order, be provided with on the switch module and put down the screen switch, it is used for switching output under user's the triggering and shows bright screen or put down the screen of putting down and switch the signal of telecommunication, then, the micro-control chip will be put down screen switching signal of telecommunication and be converted into the signal of telecommunication that interface unit can discern and obtain the signal of telecommunication after the conversion to transmit to the projecting apparatus through the interface unit, thereby realized through the terminal equipment of all-in-one to the bright screen of projecting apparatus with put down screen control. Therefore, on the one hand, the light source of the projector can be turned off and on the premise of not turning off and on the projector, so that the projector can quickly turn off and on in a black screen mode, and the energy conservation and the normal work can be quickly switched; in addition, the projector works in a screen-off state without cutting off a power supply, so that the repeated restarting times of the projector can be reduced, and the service life of the projector is prolonged. On the other hand, through the on-off control of the screen brightening and the screen turning-off of the terminal equipment, the remote controller of the projector and the keys on the projector can be not required to be relied on, so that the trouble that a user moves to the projector and searches the remote controller to press the keys is avoided.

As an optional scheme, the first function switch and the second function switch for enhancing and weakening the working brightness of the projector are switch keys which are arranged on the terminal device and used for controlling the functions of the integrated machine, so that the existing switch keys arranged on the terminal device can be reused, and the hardware cost of a projector control circuit can be reduced.

As an optional scheme, the control chip outputs a shutdown control signal to the projector in response to a power shutdown signal output by the power switch to cut off a working power supply of the projector, thereby implementing shutdown control of the projector through the terminal device of the all-in-one machine and facilitating shutdown operation of a user.

Other advantages of the present invention will be described in the detailed description, and those skilled in the art can understand the technical advantages brought by the technical features and technical solutions through the descriptions of the technical features and the technical solutions.

Drawings

Embodiments according to the present invention will be described below with reference to the accompanying drawings. In the figure:

fig. 1 is a schematic diagram of a connection structure between a projector and a projector control circuit according to the embodiment;

fig. 2 is a schematic structural diagram of a switch module disclosed in this embodiment;

fig. 3 is a schematic diagram of a connection structure of a switch module disclosed in this embodiment;

fig. 4 is a schematic diagram of another switch module connection structure disclosed in this embodiment;

fig. 5 is a schematic structural diagram of a projection system disclosed in this embodiment.

Detailed Description

In order to realize the convenient screen-off operation of the projector and improve the user experience, the embodiment discloses a projector control circuit integrated in an all-in-one machine, generally speaking, the all-in-one machine is equipped with a terminal device and a display screen (or a touch screen), and the terminal device performs display control and key control operation on the display screen, or an additional interface module can be provided. Referring to fig. 1, a schematic diagram of a connection structure between a projector and a projector control circuit disclosed in this embodiment is shown, where a terminal device a1 is used to perform key control operation on a kiosk and/or provide an interface module for the kiosk. The projector A2 is in signal connection with the all-in-one machine through a multimedia interface A11 to receive and project image data sent by the all-in-one machine to a projection plane; projector a2 may also be connected to the interface unit of the kiosk via a data line, and receive some control signals sent by the kiosk via the interface unit, and these control signals are typically digital signals.

Referring to fig. 1, the projector control circuit disclosed in this embodiment is disposed on a terminal device a1, and the control circuit disclosed in this embodiment includes: switch module 1, micro-control chip 2 and the interface unit 3 of signal connection in proper order, wherein:

referring to fig. 2, which is a schematic structural diagram of a switch module disclosed in this embodiment, fig. 2 illustrates 8 switches, KEY1, KEY2, and KEY3 … … KEY8, which may be, for example, volume adjustment, display adjustment, and the like for an all-in-one machine, and in a specific embodiment, the specific number of switches may be determined according to actual needs. In this embodiment, the switch module 1 is provided with a screen-off switch, for example, the KEY5 is taken as the screen-off switch, and the screen-off switch KEY5 is used for switching and outputting a screen-off switching electrical signal indicating a screen-on or screen-off under the trigger of a user, where in this embodiment, the screen-on electrical signal is a signal for turning on the projector light source, and the screen-off electrical signal is a signal for turning off the projector light source. As an example, when the projector is in operation and receives a screen-off signal, the light source (e.g., an LED lamp, a halogen lamp, etc.) of the projector may be turned off, so that the projector does not project a picture onto the projection plane any more, and at this time, other modules may still be in an operating state, and of course, in a specific implementation process, other modules may also be in a low power consumption mode; after receiving the screen-on signal, the projector turns on the light source, so that a corresponding picture can be projected to the projection plane through the projection lens. In a preferred embodiment, the bright screen electric signal and the information screen electric signal are digital signals.

The micro control chip 2 responds to the screen switching electric signal output by the switch module 1, and converts the screen switching electric signal into an electric signal which can be recognized by the interface unit 3 to obtain a converted electric signal. In a specific embodiment, the micro control chip 2 may be a special integrated circuit chip, or may be a general chip with an electrical signal conversion function, such as a single chip, a DSP, or the like. In this embodiment, the KEY5 has two working states, that is, the KEY5 switches back and forth between two working levels, and when the user triggers the KEY5, the KEY5 outputs a corresponding electrical signal after the level is switched to the micro-control chip 2, and the electrical signal indicates as screen-off or screen-on. After receiving the screen-off switching electrical signal, the micro-control chip 2 converts the screen-off switching electrical signal into an electrical signal recognizable by the corresponding interface unit 3, where the converted electrical signal may be a combination of a series of digital signals, and the screen-off state or the screen-on state is represented by a combination of different digital signals.

The interface unit 3 is used to connect to a corresponding interface of the projector a2 through a data line. In a specific embodiment, the interface unit 3 may be a UART serial port or a USB interface, and specifically, the type of the interface unit 3 may be determined according to the interface type corresponding to the projector. In this embodiment, the converted electrical signal is transmitted to the interface corresponding to the projector a2 through the interface unit 3 and the data line in sequence, and the projector a2 can switch the on-off state of the bright screen or the bright screen of the projector after receiving the converted electrical signal.

In a specific embodiment, the switch module 1 is connected to the micro-control chip 2 through a GPIO port. Specifically, when the screen-off switch is not triggered, the GPIO port connected to the screen-off switch outputs a first level to the micro-control chip 2; when the screen-off switch is triggered, the GPIO port connected with the screen-off switch outputs a second level to the micro-control chip 2. In this embodiment, one of the first level and the second level is a high level, and the other is a low level, for example, when the first level is a high level, the second level is a low level, whereas if the first level is a low level, the second level is a high level. In a specific implementation process, when the screen-off switch is a physical button, the screen-off switch is triggered when a user presses the screen-off switch. In this embodiment, an example will be described in which a switch is pressed to output a low level and a switch is not pressed to output a high level.

In a specific implementation process, the screen-off switching electrical signal comprises a hopping signal and a sustaining signal, wherein the hopping signal is a signal that hops from a first level to a second level for a short time, and the sustaining signal is a signal that maintains the second level for a long time. To facilitate understanding of those skilled in the art, specifically, for example, when the user presses the screen-off switch and releases the screen-off switch, the output level of the GPIO port connected to the screen-off switch is: the first level (for example, high level) → the second level (for example, low level) → the first level (for example, high level), that is, after the level output from the GPIO port jumps to the second level for a short time, the first level is restored; when the user presses the screen-off switch and does not loose hands, at the moment, the level output by the GPIO port connected with the screen-off switch is as follows: the first level (e.g., high level) → the second level (e.g., low level), that is, after the level of the GPIO port output changes to the second level, since the user does not loose his/her hand, the level of the GPIO port output continues to be maintained at the second level (e.g., low level).

In a specific implementation process, the level output by the GPIO port can be clocked through a clock circuit. For example, a clock circuit is disposed in the micro-control chip 2, and the clock circuit is configured to clock a level output by a GPIO port connected to the screen trap switch, and when the level exceeds a preset time and is maintained at a second level, the level may be regarded as a signal that maintains the second level for a long time, and the preset time may be, for example, 100 ms.

In this embodiment, the micro control chip 2 converts the jump signal into the bright screen control signal in response to the jump signal or the sustain signal, so that the projector operates in the bright screen state, or converts the sustain signal into the dark screen control signal, so that the projector operates in the dark screen state. Specifically, after receiving the jump signal, the micro control chip 2 may convert the jump signal into a series of high and low level digital signals, where the series of high and low level digital signals represent the bright screen control signal; after receiving the continuous signal, the micro control chip 2 can convert the continuous signal into another string of high and low level digital signals, and the another string of high and low level digital signals represent the screen-off control signal.

In order to implement more control functions by multiplexing the switch module, in an alternative embodiment, please refer to fig. 2, the switch module 1 further includes: the first function switch KEY1 and the second function switch KEY2 are respectively connected to the micro-control chip 2 through GPIO ports. In this embodiment, the first function switch KEY1 and the second function switch KEY2 are both existing switch KEYs on the terminal device and used for controlling the functions of the all-in-one machine, and optionally, the first function switch KEY1 and the second function switch KEY2 are switch KEYs for increasing the volume and decreasing the volume, that is, the output volume of the all-in-one machine can be adjusted by increasing and decreasing the volume through the first function switch KEY1 and the second function switch KEY 2.

In this embodiment, when the first function switch KEY1 is not triggered, the GPIO port connected to the first function switch KEY1 outputs a first level to the micro controller chip 2, and when the first function switch KEY1 is triggered, the GPIO port connected to the first function switch KEY1 outputs a second level to the micro controller chip 2. For the description of the first level and the second level, reference may be made to the description of the above embodiments, and the principle is similar, and will not be described herein again.

In this embodiment, when the second function switch KEY2 is not triggered, the GPIO port connected to the second function switch KEY2 outputs a first level to the micro-control chip 2; when the second function switch KEY2 is triggered, the GPIO port connected to the second function switch KEY2 outputs a second level to the micro control chip 2. For the description of the first level and the second level, reference may be made to the description of the above embodiments, and the principle is similar, and will not be described herein again.

The micro-control chip 2 outputs a brightness enhancement control signal in response to the sustain signal and the level switching signal of the first function switch KEY1 to enhance the working brightness of the projector; the micro control chip 2 outputs a brightness reduction control signal to reduce the operating brightness of the projector in response to the sustain signal and the level switching signal of the second function switch KEY 2. Specifically, when the level switching signal (e.g., the first level → the second level → the first level) of the first function switch KEY1 is triggered during the time when the KEY5 is triggered and maintained at the sustain signal (e.g., the second level of the low level), the micro control chip 2 outputs the brightness enhancement control signal so that the operating brightness of the projector is increased by one brightness unit; when the level switching signal (e.g., the first level → the second level → the first level) of the second function switch KEY2 is triggered during the time when the KEY5 is triggered and maintained at the sustain signal (e.g., the second level of the low level), the micro control chip 2 outputs the luminance reduction control signal so that the operating luminance of the projector is reduced by one luminance unit.

It should be noted that when the trigger screen-off switch KEY5 is not triggered, only the first function switch KEY1 and the second function switch KEY2 are triggered, so as to adjust the volume of the all-in-one machine to increase or decrease.

In order to realize the continuous adjustment of the working brightness of the projector, in an alternative embodiment, the micro-control chip 2 outputs a brightness continuous enhancement control signal in response to the continuous signal and the continuously output second level signal of the first function switch KEY1 to continuously enhance the working brightness of the projector; the micro control chip 2 outputs a brightness continuously decreasing control signal in response to the continuous signal and the continuously outputted second level signal of the second function switch KEY2 to continuously decrease the operating brightness of the projector.

Specifically, when the first function switch KEY1 is triggered to continuously output the second level signal (e.g., the first level → the second level) during the time when the KEY5 is triggered and maintained at the continuous signal (e.g., the second level of the low level), the micro control chip 2 outputs the luminance continuously increasing control signal, so that the operating luminance of the projector continuously increases; when the second function switch KEY2 is triggered to continuously output the second level signal (e.g., the first level → the second level) during the time when the KEY5 is triggered and maintained at the continuous signal (e.g., the second level of the low level), the micro control chip 2 outputs the brightness continuously decreasing control signal, so that the operating brightness of the projector continuously decreases.

To facilitate the power off control of the projector, please refer to fig. 2, in an alternative embodiment, the switch module 1 further includes: the power switch KEY8, the micro control chip 2 responds to the power off signal outputted by the power switch KEY8, and outputs a shutdown control signal to the projector to cut off the working power of the projector. In a specific embodiment, the power switch KEY8 may also be a power control switch of the all-in-one machine, that is, the power on and off of the all-in-one machine may be controlled by triggering the power switch KEY 8. In this embodiment, the power switch KEY8 can be used to conveniently control the power off of the projector. In addition, the power supply control switch is multiplexed with the all-in-one machine, so that the hardware cost can be reduced.

It should be noted that, in the specific implementation process, since the screen-off switch KEY5 only performs on-off control on the light source of the projector, when the projector is in the screen-off state, the other modules are still in the working state, so that the trigger signal of the power switch KEY8 may be received by the projector, that is, when the projector is in the screen-off state, the power of the projector may also be turned off through the power switch KEY 8.

Referring to fig. 3, a schematic diagram of a connection structure of a switch module disclosed in this embodiment is shown, in an alternative embodiment, the projector control circuit further includes: a plurality of pull-up resistors, such as pull-up resistors R1 and R2 … … R8, wherein each pull-up resistor R1 and R2 … … R8 respectively corresponds to switches KEY1 and KEY2 … … KEY8, and one end of each pull-up resistor is connected to a power supply VCC; the other end of each pull-up resistor is respectively connected to the connection end of the switch module 1 and the GPIO port. Referring to fig. 4, which is a schematic view of another switch module connection structure disclosed in this embodiment, fig. 4 illustrates a schematic view of a connection between one of the power switches KEY8 and the GPIO port, one end of the pull-up resistor R8 is connected to the power VCC, and the other end of the pull-up resistor R8 is connected to a connection end between the power switch KEY8 and the GPIO port. The other switches are connected in a similar manner to the power switch KEY8, and will not be described in detail herein.

This embodiment also discloses an all-in-one, include: the terminal device is used for achieving key control operation, and the display device is used for achieving a display function. Referring to fig. 1, in an embodiment, the terminal device of the all-in-one machine may include a micro control chip 2 and an OPS system main board 4, and the micro control chip 2 and the OPS system main board 4 perform data interaction through I/O. In a specific embodiment, the OPS system motherboard 4 may be loaded with, for example, a Windows system. The micro control chip 2 can perform data interaction with the multimedia interface A11 through an I/O port and/or an I2C.

In this embodiment, the terminal device is provided with the projector control circuit disclosed in the above embodiment.

In an alternative embodiment, the terminal device may further be equipped with a front multimedia interface a12, the front multimedia interface a12 may be, for example, a VGA interface, an HDMI interface, etc., and the front multimedia interface a12 is used for receiving image data of an external device (e.g., a notebook computer).

In an alternative embodiment, the terminal device may further be equipped with a USB interface a13, and the USB interface a13 performs data interaction with the micro control chip. In the specific implementation process, an LED lamp, a power panel and the like can be further configured.

Referring to fig. 5, a schematic structural diagram of a projection system disclosed in this embodiment is shown, where the projection system includes: projector B1 and the kiosk disclosed in the above embodiment, projector B1 is in signal connection with the kiosk through a multimedia interface to receive and project the image data sent by the kiosk, wherein the multimedia interface may be VGA, HDMI, etc. The terminal device a1 in the all-in-one machine is also connected to the projector through the interface unit 3.

According to the embodiment of the utility model discloses a projector control circuit, all-in-one and projection system integrated in all-in-one, projector control circuit sets up on terminal equipment, and control circuit includes: the switch module, micro-control chip and the interface unit that signal connection in proper order, be provided with on the switch module and put down the screen switch, it is used for switching output under user's the triggering and shows bright screen or put down the screen of putting down and switch the signal of telecommunication, then, the micro-control chip will be put down screen switching signal of telecommunication and be converted into the signal of telecommunication that interface unit can discern and obtain the signal of telecommunication after the conversion to transmit to the projecting apparatus through the interface unit, thereby realized through the terminal equipment of all-in-one to the bright screen of projecting apparatus with put down screen control. Therefore, on the one hand, the light source of the projector can be turned off and on the premise of not turning off and on the projector, so that the projector can quickly turn off and on in a black screen mode, and the energy conservation and the normal work can be quickly switched; in addition, the projector works in a screen-off state without cutting off a power supply, so that the repeated restarting times of the projector can be reduced, and the service life of the projector is prolonged. On the other hand, through the on-off control of the screen brightening and the screen turning-off of the terminal equipment, the remote controller of the projector and the keys on the projector can be not required to be relied on, so that the trouble that a user moves to the projector and searches the remote controller to press the keys is avoided.

As an optional scheme, the first function switch and the second function switch for enhancing and weakening the working brightness of the projector are switch keys which are arranged on the terminal device and used for controlling the functions of the integrated machine, so that the existing switch keys arranged on the terminal device can be reused, and the hardware cost of a projector control circuit can be reduced.

As an optional scheme, the control chip outputs a shutdown control signal to the projector in response to a power shutdown signal output by the power switch to cut off a working power supply of the projector, thereby implementing shutdown control of the projector through the terminal device of the all-in-one machine and facilitating shutdown operation of a user.

It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.

It will be understood that the above-described embodiments are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions may be made in the details described herein by those skilled in the art without departing from the basic principles of the invention.

Claims (10)

1. A projector control circuit integrated in an all-in-one machine, the all-in-one machine is provided with a terminal device, the terminal device is used for carrying out key control operation on the all-in-one machine, and the projector control circuit is characterized in that,

the projector control circuit is arranged on the terminal equipment; the control circuit includes: switch module (1), micro-control chip (2) and interface unit (3) of signal connection in proper order, wherein:

the switch module (1) is provided with a screen-off switch, and the screen-off switch is used for switching and outputting a screen-off switching electric signal for showing screen lightening or screen off under the triggering of a user; the screen-on electric signal is a signal for turning on the projector light source, and the screen-off electric signal is a signal for turning off the projector light source;

the micro control chip (2) responds to the screen-off switching electric signal output by the switch module, and converts the screen-off switching electric signal into an electric signal which can be recognized by the interface unit (3) to obtain a converted electric signal;

the interface unit (3) is used for being connected to an interface corresponding to the projector through a data line; the converted electric signals are transmitted to an interface corresponding to the projector through the interface unit (3) and the data line in sequence so as to switch the on-off state of the bright screen or the off-off state of the bright screen of the projector.

2. The projector control circuit according to claim 1, wherein the switch module (1) is connected to the micro-control chip (2) through a GPIO port;

when the screen-off switch is not triggered, a GPIO port connected with the screen-off switch outputs a first level to the micro-control chip (2);

when the screen-off switch is triggered, a GPIO port connected with the screen-off switch outputs a second level to the micro-control chip (2), wherein one of the first level and the second level is a high level, and the other level is a low level;

the screen switching electric signal comprises a hopping signal and a sustaining signal, wherein the hopping signal is a signal which hops from the first level to the second level in a short time, and the sustaining signal is a signal which maintains the second level in a long time;

and the micro-control chip (2) responds to the hopping signal or the continuous signal, converts the hopping signal into a bright screen control signal so that the projector works in the bright screen state, or converts the continuous signal into a dark screen control signal so that the projector works in the dark screen state.

3. The projector control circuit according to claim 2, wherein the switch module (1) further comprises: the first function switch (KEY1) and the second function switch (KEY2) are respectively connected to the micro-control chip (2) through GPIO ports; the first function switch (KEY1) and the second function switch (KEY2) are both switch KEYs which are arranged on the terminal equipment and are used for controlling the functions of the all-in-one machine;

when the first functional switch (KEY1) is not triggered, the GPIO port connected with the first functional switch (KEY1) outputs a first level to the micro-control chip (2); when the first functional switch (KEY1) is triggered, the GPIO port connected with the first functional switch (KEY1) outputs a second level to the micro-control chip (2);

when the second functional switch (KEY2) is not triggered, the GPIO port connected with the second functional switch (KEY2) outputs a first level to the micro-control chip (2); when the second functional switch (KEY2) is triggered, the GPIO port connected with the second functional switch (KEY2) outputs a second level to the micro-control chip (2);

the micro control chip (2) responds to the continuous signal and a level switching signal of the first function switch (KEY1) and outputs a brightness enhancement control signal to enhance the working brightness of the projector; the micro control chip (2) outputs a brightness reduction control signal in response to the continuous signal and a level switching signal of the second function switch (KEY2) to reduce the working brightness of the projector.

4. The projector control circuit as defined in claim 3, further comprising:

the micro control chip (2) responds to the continuous signal and the continuously output second level signal of the first function switch (KEY1) to output a brightness continuous enhancement control signal so as to continuously enhance the working brightness of the projector; the micro control chip (2) responds to the continuous signal and the continuously output second level signal of the second function switch (KEY2) to output a brightness continuous weakening control signal so as to continuously weaken the working brightness of the projector.

5. The projector control circuit as claimed in claim 3, wherein the first function switch (KEY1) and the second function switch (KEY2) are switch buttons of volume up and volume down, respectively.

6. The projector control circuit according to any of claims 1 to 5, wherein the switch module (1) further comprises:

the micro control chip (2) responds to a power supply cut-off signal output by the power supply switch (KEY8) and outputs a shutdown control signal to the projector so as to cut off the working power supply of the projector.

7. The projector control circuit as claimed in any of claims 2 to 5, further comprising:

one end of each pull-up resistor is connected to a power supply, and the other end of each pull-up resistor is connected to the connecting end of the switch module (1) and the GPIO port respectively.

8. The projector control circuit according to any of claims 1 to 5, wherein the interface unit (3) is a UART serial port or a USB interface.

9. An all-in-one machine, comprising: the projector control circuit comprises a display device and a terminal device, wherein the terminal device is used for realizing key control operation, and the display device is used for realizing a display function, and is characterized in that the projector control circuit is arranged on the terminal device according to any one of claims 1-8.

10. A projection system, comprising:

a projector; and

the integrated machine of claim 9; the projector is in signal connection with the all-in-one machine through a multimedia interface so as to receive and project the image data sent by the all-in-one machine;

the terminal equipment in the all-in-one machine is also connected to the projector through the interface unit (3).

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