Signal processing circuit, state control method and display device

Abstract

The present application discloses a signal processing circuit, a state control method, and a display device. The signal processing circuit includes an on-off control unit and a signal processing unit. The on-off control unit connects the signal processing unit and the SDI unit in response to a connection instruction sent by the MCU. The connection instruction is triggered by the MCU when the display device starts to be in standby mode. After receiving the first SDI signal sent by the SDI unit, the signal processing unit adjusts the voltage of the first SDI signal and sends the adjusted second SDI signal to the MCU, so that the MCU determines whether to control the display device to enter the working state based on the second SDI signal received within a preset time. Through the on-off control unit, the signal processing unit and the SDI unit are connected only when the display device is in standby mode, avoiding the impact on the SDI signal analysis when the display device is working. By adjusting the voltage of the SDI signal, the MCU can more accurately collect the SDI signal.

Description

Technical Field

[0001] The present application relates to the field of signal processing technology, and in particular to a signal processing circuit, a state control method, and a display device. Background Art

[0002] To reduce the power consumption of a display device during standby mode, the display device's system-on-chip (SoC) must be powered off. After the display device enters standby mode, the display device's microcontroller unit (MCU) detects whether signals are connected to each port. If a signal is connected, the MCU powers the SoC back on.

[0003] In related technologies, an MCU can detect power signals, such as the high and low levels of Display Port (DP) and Video Graphics Array (VGA) signals, through a general-purpose input / output (GPIO) port to determine whether such signals are present. However, serial digital interface (SDI) units typically transmit high-frequency, low-amplitude signals via coaxial transmission, making it difficult for an MCU to accurately detect SDI signals directly. Summary of the Invention

[0004] Embodiments of the present application provide a signal processing circuit, a state control method, and a display device for accurately detecting SDI signals.

[0005] In a first aspect, an embodiment of the present application provides a signal processing circuit, comprising:

[0006] an on-off control unit, configured to connect the signal processing unit and the SDI unit of the display device in response to a connection instruction sent by the MCU; wherein the connection instruction is triggered by the MCU when the display device starts to be in standby mode;

[0007] The signal processing unit is used to adjust the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit, and send the adjusted second SDI signal to the MCU, so that the MCU determines whether to control the display device to enter the working state based on the second SDI signal received within a preset time length.

[0008] In the above solution, since the SDI signal is a high-frequency, low-amplitude signal, a signal processing circuit is added between the SDI unit and the MCU to adjust the voltage of the SDI signal, allowing the MCU to more accurately collect the SDI signal; since the SDI signal is random and the amplitude fluctuates within a certain range, the MCU performs signal detection based on the second SDI signal received within a preset time period and accurately controls the display device to enter the working state; in addition, the signal processing circuit is also provided with an on-off control unit, which connects the signal processing unit and the SDI unit only when the display device is on standby to process the SDI signal, thereby avoiding affecting the SDI signal analysis when the display device is working.

[0009] In some optional embodiments, the signal processing unit includes a DC component elimination subunit and a boost subunit, wherein the DC component elimination subunit is connected to one end of the on-off control unit, and the SDI unit is connected to the other end of the on-off control unit; the boost subunit is respectively connected to the DC component elimination subunit and the analog-to-digital converter conversion pin in the MCU;

[0010] The DC component elimination subunit is configured to, after receiving the first SDI signal sent by the SDI unit, remove the DC component from the first SDI signal to obtain a third SDI signal; and send the third SDI signal to the boost subunit;

[0011] The boost subunit is configured to add a DC bias voltage to the third SDI signal to obtain the second SDI signal, and send the second SDI signal to the MCU via the analog-to-digital converter conversion pin.

[0012] The above solution, by providing a DC component elimination subunit, removes the DC component from the first SDI signal, retaining only the high-frequency signal portion of the first SDI signal to obtain a third SDI signal, thereby reducing interference with subsequent signal detection caused by different DC levels superimposed on the SDI signal; and by providing a boost subunit, a DC bias voltage is added to the above third SDI signal to obtain a second SDI signal, which the ADC can accurately capture.

[0013] In some optional implementations, the DC component elimination subunit includes a coupling capacitor; the boost subunit includes a bias resistor;

[0014] The input end of the coupling capacitor is connected to one end of the on-off control unit for receiving the first SDI signal sent by the SDI unit; the output end of the coupling capacitor is connected to the input end of the bias resistor for sending the third SDI signal to the bias resistor;

[0015] The power end of the bias resistor is connected to the power supply, and is used to obtain the DC bias voltage by voltage division from the power supply; the output end of the bias resistor is connected to the analog-to-digital converter conversion pin, and is used to send the second SDI signal to the analog-to-digital converter conversion pin in the MCU.

[0016] In the above solution, the DC component in the first SDI signal can be isolated through the coupling capacitor, retaining only the high-frequency signal portion; the required DC bias voltage is obtained by dividing the power supply voltage according to different application scenarios through the bias resistor.

[0017] In some optional implementations, the DC bias voltage is the median of a sampling range of a conversion pin of an analog-to-digital converter in the MCU; or

[0018] The DC bias voltage is the difference between the median of the sampling range of the analog-to-digital converter conversion pin in the MCU and a preset deviation; or

[0019] The DC bias voltage is the sum of the median of the sampling range of the analog-to-digital converter conversion pin in the MCU and a preset deviation.

[0020] The above scheme uses the median of the ADC sampling range as the DC bias voltage, or adjusts the median of the ADC sampling range based on a preset deviation to obtain the DC bias voltage, thereby ensuring that the DC bias voltage is the same as or close to the median of the ADC sampling range. This can reduce the occurrence of the third SDI signal being outside the sampling range of the above-mentioned ADC conversion pin or approaching the sampling boundary of the ADC conversion pin.

[0021] In some optional implementation manners, the on-off control unit is further configured to:

[0022] In response to a disconnection instruction sent by the MCU, the connection between the SDI unit and the signal processing unit is disconnected; wherein the disconnection instruction is triggered by the MCU when it determines that the display device starts to work.

[0023] In the above solution, the MCU triggers a disconnection instruction when it determines that the display device has started working. After receiving the disconnection instruction sent by the MCU, the on-off control unit disconnects the connection between the SDI unit and the signal processing unit, thereby preventing the signal processing circuit from affecting the SoC's analysis of the SDI signal.

[0024] In a second aspect, an embodiment of the present application provides a state control method applied to an MCU of a display device, the method comprising:

[0025] In response to the standby notification, the display device is controlled to enter a standby state, and a connection instruction is sent to a signal processing circuit of the display device; so that the signal processing circuit is connected to the SDI unit of the display device based on the connection instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit; wherein the standby notification is triggered by the SoC in the display device, or the standby notification is triggered by a standby button connected to the MCU;

[0026] If the DP signal input state indication is not input and the VGA signal input state indication is not input, determining the SDI signal input state based on a second SDI signal sent by the signal processing circuit and received within a preset time period; wherein the second SDI signal is obtained by the signal processing circuit adjusting the voltage of the first SDI signal;

[0027] Based on the SDI signal input status, it is determined whether to control the display device to enter a working state.

[0028] In the above solution, since the SDI signal is a high-frequency, low-amplitude signal, a signal processing circuit is added between the SDI unit and the MCU to adjust the voltage of the SDI signal, allowing the MCU to more accurately capture the SDI signal. Since the SDI signal is random and the amplitude fluctuates within a certain range, the MCU performs signal detection based on the second SDI signal received within a preset duration and accurately controls the display device to enter the working state. In addition, the signal processing circuit will only connect to the SDI unit and process the SDI signal when the display device is on standby, avoiding affecting the SDI signal analysis when the display device is working.

[0029] In some optional implementations, determining the SDI signal input state based on the second SDI signal sent by the signal processing circuit and received within a preset time period includes:

[0030] Compare the average value corresponding to each sub-period within the preset time length with the target voltage peak value and the target voltage valley value respectively; wherein the average value corresponding to any sub-period is the voltage average value of the second SDI signal received in the sub-period;

[0031] Determine, based on the comparison result, a first number of times that the average value corresponding to the sub-period is greater than the target voltage peak value, and a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value;

[0032] If the first number exceeds a preset number and the second number exceeds the preset number, determining that the SDI signal input state indicates input; otherwise determining that the SDI signal input state indicates not input;

[0033] Determining whether to control the display device to enter a working state based on the SDI signal input state includes:

[0034] If the SDI signal input status indicates input, the display device is controlled to enter a working state; if the SDI signal input status indicates no input, the display device is not controlled to enter a working state.

[0035] The above solution. Since the sampling frequency of the ADC conversion pin is low, the voltage average value of the second SDI signal received in a sub-period can be used as the voltage value of the sub-period; by determining the first number of times the average value corresponding to the sub-period is greater than the target voltage peak value, and the second number of times the average value corresponding to the sub-period is less than the target voltage valley value, if the first number exceeds the preset number, it means that the average value corresponding to the sub-period is greater than the target voltage peak value more often; if the second number also exceeds the preset number, it means that the average value corresponding to the sub-period is less than the target voltage valley value more often; after the above two conditions are met, it can be determined that the second SDI signal fluctuates significantly within the preset time length, thereby determining the input state representation of the SDI signal input.

[0036] In some optional implementations, the method further comprises:

[0037] If the DP signal input state indicates input, or the VGA signal input state indicates input, the display device is controlled to enter a working state.

[0038] In the above solution, since the MCU needs to power on the SoC again when an SDI signal, DP signal or VGA signal is connected, the display device can be directly controlled to enter the working state when the DP signal input status indicates input or the VGA signal input status indicates no input.

[0039] In some optional implementations, if the display device is controlled to enter a working state, the method further includes:

[0040] A disconnection instruction is sent to the signal processing circuit, so that the signal processing circuit disconnects from the SDI unit based on the disconnection instruction.

[0041] In the above solution, the MCU triggers a disconnection instruction when it determines that the display device starts working. After the signal processing circuit receives the disconnection instruction sent by the MCU, it disconnects from the SDI unit, thereby preventing the signal processing circuit from affecting the SoC's analysis of the SDI signal.

[0042] In a third aspect, an embodiment of the present application provides a display device, comprising a signal processing circuit as described in any one of the first aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] Figure 1 The figure shows the first system architecture diagram provided in the embodiment of the present application;

[0045] Figure 2 Shown is a schematic diagram of a signal processing circuit provided in an embodiment of the present application;

[0046] Figure 3 The figure shows the second system architecture diagram provided in the embodiment of the present application;

[0047] Figure 4 Schematic diagram of a signal processing unit provided in an embodiment of the present application;

[0048] Figure 5 The third system architecture diagram provided in the embodiment of the present application is shown;

[0049] Figure 6 FIG2 is a schematic diagram of a third SDI signal provided in an embodiment of the present application;

[0050] Figure 7 FIG. 1 is a schematic diagram of a DC bias voltage provided in an embodiment of the present application;

[0051] Figure 8 FIG2 is a schematic diagram of a second SDI signal provided in an embodiment of the present application;

[0052] Figure 9 Schematic diagram of a DC component elimination subunit provided in an embodiment of the present application is shown;

[0053] Figure 10 Shown is a schematic diagram of a boost subunit provided in an embodiment of the present application;

[0054] Figure 11 The fourth system architecture diagram provided in the embodiment of the present application is shown;

[0055] Figure 12 FIG. 1 is a flow chart of a first state control method provided in an embodiment of the present application;

[0056] Figure 13 FIG2 is a flow chart of a method for determining an SDI signal input state provided in an embodiment of the present application;

[0057] Figure 14FIG2 is a flow chart of a second state control method provided in an embodiment of the present application;

[0058] Figure 15 FIG. 1 is a flow chart of a third state control method provided in an embodiment of the present application;

[0059] Figure 16 FIG. 4 is a flow chart of a fourth state control method provided in an embodiment of the present application;

[0060] Figure 17 FIG. 5 is a flow chart of a fifth state control method provided in an embodiment of the present application;

[0061] Figure 18 A schematic structural diagram of a first state control device provided in an embodiment of the present application;

[0062] Figure 19 A schematic structural diagram of a second state control device provided in an embodiment of the present application;

[0063] Figure 20 A schematic diagram of the structure of the MCU provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] To make the objectives, technical solutions, and advantages of this application more clear, this application will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0065] In the description of this application, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean direct connection, indirect connection through an intermediate medium, or internal communication between two devices. Those skilled in the art will understand the specific meaning of the above terms in this application based on specific circumstances.

[0066] The terms "comprise," "include," and "have," and any variations thereof, are intended to cover but not exclude inclusion; for example, a product or device comprising a list of components is not necessarily limited to all the components expressly listed but may include other components not expressly listed or inherent to such product or device.

[0067] The term "module" refers to any known or later developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functionality associated with that element.

[0068] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0069] With the development of science and technology, display devices (such as cameras, video recorders, monitoring systems, medical displays and other equipment) are being used more and more widely.

[0070] See Figure 1 As shown, the display device is provided with video ports (SDI unit, DP unit, VGA unit), and two controllers (SoC and MCU); SoC is connected to the display screen and outputs the video frames to be displayed.

[0071] In order to reduce the power consumption of the display device when it is in standby mode, it is necessary to power off the SoC of the display device in standby mode. The SoC notifies the MCU through I2C (two-wire serial bus), and the MCU cuts off the power of the SoC. After the display device is in standby mode, the MCU of the display device detects whether the signals of each port are connected, that is, the input detection mechanism of the SDI signal, DP signal and VGA signal is started to determine whether there is a signal connected (the input status of any one of the SDI signal, DP signal and VGA signal represents the input).

[0072] Once it is confirmed that there is a signal input, the MCU needs to power on the SoC again.

[0073] The video port is also connected to the SoC. After the SoC is powered on, it parses and processes the SDI signal, DP signal, and VGA signal according to the selected video channel, and displays the image through the display.

[0074] in:

[0075] The interface definitions of the DP unit and the VGA unit include power signals. The MCU can use GPIO to detect whether the DP signal is a high-level signal or a low-level signal to determine whether the DP signal input state represents input, and use GPIO to detect whether the VGA signal is a high-level signal or a low-level signal to determine whether the VGA signal input state represents input; for example, when a signal is connected, the GPIO input will have an edge jump, thereby triggering an MCU interrupt, and a flag will be set in the corresponding interrupt processing function. The flag DP_INPUT is set to 1 in the detection interrupt of the DP unit; the flag VGA_INPUT is set to 1 in the detection interrupt of the VGA unit. If the DP_INPUT flag is 1, it means that the DP signal input state represents input, and if the VGA_INPUT flag is 1, it means that the VGA signal input state represents input;

[0076] However, the SDI unit transmits a high-frequency, low-amplitude SDI signal. The sampling rate of the analog-to-digital converter in the MCU is low, making it difficult to effectively collect the SDI signal, and thus unable to accurately detect the SDI signal.

[0077] Based on this, the embodiments of the present application provide a signal processing circuit, a state control method, and a display device for accurately detecting SDI signals. The following describes in detail the technical solution of the present application and how it solves the above-mentioned technical problems with specific embodiments.

[0078] Figure 2 This is a schematic diagram of a signal processing circuit provided by an embodiment of the present application. Figure 2 As shown, the signal processing circuit may include an on-off control unit and a signal processing unit; wherein:

[0079] an on-off control unit, configured to connect the signal processing unit and the SDI unit of the display device in response to a connection instruction sent by the MCU; wherein the connection instruction is triggered by the MCU when the display device starts to be in standby mode;

[0080] The signal processing unit is used to adjust the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit, and send the adjusted second SDI signal to the MCU, so that the MCU determines whether to control the display device to enter the working state based on the second SDI signal received within a preset time length.

[0081] Correspondingly, the system architecture can be found in Figure 3 Similarly, the display device is provided with an SDI unit, a DP unit, a VGA unit, a SoC, and an MCU; the SoC is connected to the display screen and outputs the video frames to be displayed.

[0082] In order to reduce the power consumption of the display device when it is in standby mode, it is necessary to power off the SoC of the display device in standby mode. The SoC notifies the MCU through I2C, and the MCU cuts off the power of the SoC. After the display device is in standby mode, the MCU of the display device detects whether the signals of each port are connected, that is, the input detection mechanism of the SDI signal, DP signal and VGA signal is started to determine whether there is a signal connected (the input status of any one of the SDI signal, DP signal and VGA signal represents the input).

[0083] The signal processing circuit processes the SDI signal and sends the processed SDI signal to the MCU. The MCU performs SDI signal detection more accurately based on the SDI signal received within a preset time period.

[0084] Once the MCU confirms that a signal is connected, it needs to re-power the SoC. The video port is also connected to the SoC. After the SoC is powered on, it analyzes and processes the SDI, DP, and VGA signals according to the selected video channel, and displays the image on the display.

[0085] That is to say, a signal processing circuit is added between the SDI unit and the MCU to process the SDI signal. The SDI signal is a high-frequency, low-amplitude signal, and the voltage of the SDI signal needs to be adjusted so that the MCU can collect the SDI signal more accurately. The SDI signal is random and the amplitude fluctuates within a certain range. Therefore, the MCU performs signal detection based on the second SDI signal received within a preset time length, and determines whether to control the display device to enter the working state.

[0086] In addition, the SDI signal transmission rate is very high (up to 12Gbps), and the signal processing circuit will produce reflection effects on the high-frequency SDI signal. The superposition of the reflected signal and the SDI signal will form a groove phenomenon in the signal waveform, which will affect its impedance matching and the EMI characteristics of the system, and thus affect the SoC's analysis of the SDI signal. Therefore, the signal processing circuit includes an on-off control unit. Only when the display device is in standby mode will the signal processing unit and the SDI unit be connected to process the SDI signal to avoid affecting the SDI signal analysis when the display device is working.

[0087] The aforementioned connection instruction is triggered by the MCU when it determines that the display device has entered standby mode. That is, after receiving the standby notification, the MCU sends a connection instruction to the on-off control unit of the signal processing circuit. This embodiment does not limit the triggering method of the standby notification. For example, in some embodiments, the standby notification is triggered by the SoC; in some embodiments, the standby notification is triggered by a standby button connected to the MCU.

[0088] This embodiment does not limit the specific implementation method of the standby button. For example, the standby button is a pressable physical button set outside the MCU. When the user does not need to use the display device, the user can trigger the standby notification by pressing the physical button; or the standby button is a virtual button set in the user interface outside the MCU. When the user does not need to use the display device, the user can trigger the standby notification by clicking the virtual button in the user interface.

[0089] This embodiment does not limit the specific scenarios in which the SoC triggers the standby notification. For example, if the SoC has a preset standby time, if the user does not use the display device for a long time (exceeding the above standby time), the SoC actively triggers the standby notification; or, if the SoC has a preset standby period, if the current moment is in the standby period, the SoC actively triggers the standby notification.

[0090] This embodiment does not impose any specific limitation on the above-mentioned preset duration, such as the duration corresponding to two video frames.

[0091] In the above solution, since the SDI signal is a high-frequency, low-amplitude signal, a signal processing circuit is added between the SDI unit and the MCU to adjust the voltage of the SDI signal, allowing the MCU to more accurately collect the SDI signal; since the SDI signal is random and the amplitude fluctuates within a certain range, the MCU performs signal detection based on the second SDI signal received within a preset time period and accurately controls the display device to enter the working state; in addition, the signal processing circuit is also provided with an on-off control unit, which connects the signal processing unit and the SDI unit only when the display device is on standby to process the SDI signal, thereby avoiding affecting the SDI signal analysis when the display device is working.

[0092] See Figure 4 As shown, in some optional implementations, the signal processing unit may include a DC component elimination subunit and a boost subunit; correspondingly, the system architecture can be found in Figure 5 shown.

[0093] See above Figure 4 as well as Figure 5 Similarly, the display device is provided with an SDI unit, a DP unit, a VGA unit, a SoC and an MCU; the SoC is connected to the display screen and outputs the video frames to be displayed.

[0094] In order to reduce the power consumption of the display device when it is in standby mode, it is necessary to power off the SoC of the display device in standby mode. The SoC notifies the MCU through I2C, and the MCU cuts off the power of the SoC. After the display device is in standby mode, the MCU of the display device detects whether the signals of each port are connected, that is, the input detection mechanism of the SDI signal, DP signal and VGA signal is started to determine whether there is a signal connected (the input status of any one of the SDI signal, DP signal and VGA signal represents the input).

[0095] The DC component elimination subunit is connected to one end of the on-off control unit ( Figure 5 Taking end A as an example), the SDI unit is connected to the other end of the on-off control unit ( Figure 5 The boost subunit is connected to the DC component elimination subunit and the analog to digital converter (ADC) conversion pin in the MCU respectively;

[0096] The DC component elimination subunit is configured to, after receiving the first SDI signal sent by the SDI unit, remove the DC component from the first SDI signal to obtain a third SDI signal; and send the third SDI signal to the boost subunit;

[0097] The boost subunit is configured to add a DC bias voltage to the third SDI signal to obtain the second SDI signal, and send the second SDI signal to the MCU via the analog-to-digital converter conversion pin;

[0098] The MCU detects SDI signals more accurately based on the SDI signals received within a preset time period;

[0099] Once the MCU confirms that a signal is connected, it needs to re-power the SoC. The video port is also connected to the SoC. After the SoC is powered on, it analyzes and processes the SDI, DP, and VGA signals according to the selected video channel, and displays the image on the display.

[0100] During implementation, different signal sources and connecting wire lengths may result in different DC levels superimposed on the SDI signal, which may interfere with subsequent signal detection. Based on this, a DC component elimination subunit is provided in the signal processing circuit of this embodiment to remove the DC component from the first SDI signal, retaining only the high-frequency signal portion of the first SDI signal to obtain a third SDI signal.

[0101] In addition, if the SDI signal is not within the sampling range of the above-mentioned ADC conversion pin, or is close to the sampling boundary of the ADC conversion pin, the ADC still cannot accurately capture the SDI signal; based on this, the signal processing circuit of this embodiment is also provided with a boost subunit, which adds a DC bias voltage to the above-mentioned third SDI signal to obtain a second SDI signal, and the ADC can accurately capture the second SDI signal.

[0102] See Figure 6 As shown, the voltage of the third SDI signal is generally low. Figure 7 The DC bias voltage shown is Figure 8 As shown in FIG. 4 , the voltage value of the second SDI signal is significantly increased.

[0103] above Figures 6-8 This is just an example description, and this embodiment does not limit the specific implementation of the third SDI signal, the DC bias voltage, and the second SDI signal.

[0104] The above solution, by providing a DC component elimination subunit, removes the DC component from the first SDI signal, retaining only the high-frequency signal portion of the first SDI signal to obtain a third SDI signal, thereby reducing interference with subsequent signal detection caused by different DC levels superimposed on the SDI signal; and by providing a boost subunit, a DC bias voltage is added to the above third SDI signal to obtain a second SDI signal, which the ADC can accurately capture.

[0105] This embodiment does not specifically limit the DC bias voltage, but exemplarily:

[0106] 1) The DC bias voltage is the median of the sampling range of the analog-to-digital converter conversion pin in the MCU;

[0107] 2) The DC bias voltage is the difference between the median of the sampling range of the analog-to-digital converter conversion pin in the MCU and a preset deviation;

[0108] 3) The DC bias voltage is the sum of the median of the sampling range of the analog-to-digital converter conversion pin in the MCU and the preset deviation.

[0109] The above scheme uses the median of the ADC sampling range as the DC bias voltage, or adjusts the median of the ADC sampling range based on a preset deviation to obtain the DC bias voltage, thereby ensuring that the DC bias voltage is the same as or close to the median of the ADC sampling range. This can reduce the occurrence of the third SDI signal being outside the sampling range of the above-mentioned ADC conversion pin or approaching the sampling boundary of the ADC conversion pin.

[0110] See Figure 9 As shown, the DC component elimination subunit includes coupling capacitors; see Figure 10 As shown, the boost subunit includes bias resistors (R1 and R2); correspondingly, the system architecture can be seen in Figure 11 Similarly, the display device is provided with an SDI unit, a DP unit, a VGA unit, a SoC, and an MCU; the SoC is connected to the display screen and outputs the video frames to be displayed.

[0111] In order to reduce the power consumption of the display device when it is in standby mode, it is necessary to power off the SoC of the display device in standby mode. The SoC notifies the MCU through I2C, and the MCU cuts off the power of the SoC. After the display device is in standby mode, the MCU of the display device detects whether the signals of each port are connected, that is, the input detection mechanism of the SDI signal, DP signal and VGA signal is started to determine whether there is a signal connected (the input status of any one of the SDI signal, DP signal and VGA signal represents the input).

[0112] The input end (IN1) of the coupling capacitor is connected to one end (end A) of the on-off control unit, and is used to receive the first SDI signal sent by the SDI unit; the output end (OUT1) of the coupling capacitor is connected to the input end (IN2) of the bias resistor, and is used to send the third SDI signal to the bias resistor;

[0113] The power terminal of the bias resistor is connected to a power supply, and is used to divide the voltage from the power supply to obtain the DC bias voltage; the output terminal (OUT2) of the bias resistor is connected to the analog-to-digital converter conversion pin, and is used to send the second SDI signal to the analog-to-digital converter conversion pin in the MCU. The MCU performs SDI signal detection more accurately based on the SDI signal received within a preset time period;

[0114] Once the MCU confirms that a signal is connected, it needs to re-power the SoC. The video port is also connected to the SoC. After the SoC is powered on, it analyzes and processes the SDI, DP, and VGA signals according to the selected video channel, and displays the image on the display.

[0115] Since different DC bias voltages can be set in different scenarios, this embodiment can adjust the magnitude of the voltage divided from the power supply through the bias resistor, thereby providing DC bias voltages of different magnitudes to meet the requirements of different scenarios.

[0116] In the above solution, the DC component in the first SDI signal can be isolated through the coupling capacitor, retaining only the high-frequency signal portion; the required DC bias voltage is obtained by dividing the power supply voltage according to different application scenarios through the bias resistor.

[0117] As mentioned above, the signal processing circuit will affect the SoC's analysis of the SDI signal. The signal processing unit and the SDI unit will only be connected when the display device is in standby mode. Once it is determined that an SDI signal, DP signal or VGA signal is connected, the MCU needs to power on the SoC again. At this time, the connection between the SDI unit and the signal processing unit needs to be disconnected to prevent the signal processing circuit from affecting the SoC's analysis of the SDI signal.

[0118] Based on this, in some optional implementations, the on-off control unit is further configured to:

[0119] In response to a disconnection instruction sent by the MCU, the connection between the SDI unit and the signal processing unit is disconnected; wherein the disconnection instruction is triggered by the MCU when it determines that the display device starts to work.

[0120] In the above solution, the MCU triggers a disconnection instruction when it determines that the display device has started working. After receiving the disconnection instruction sent by the MCU, the on-off control unit disconnects the connection between the SDI unit and the signal processing unit, thereby preventing the signal processing circuit from affecting the SoC's analysis of the SDI signal.

[0121] The embodiment of the present application provides a first state control method, which is applied to the above MCU, see Figure 12 As shown, the method includes:

[0122] Step S1201: In response to the standby notification, the display device is controlled to enter a standby state, and a connection instruction is sent to the signal processing circuit of the display device; so that the signal processing circuit is connected to the SDI unit of the display device based on the connection instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit.

[0123] The standby notification is triggered by the SoC in the display device, or the standby notification is triggered by a standby button connected to the MCU.

[0124] In this embodiment, a signal processing circuit is added between the SDI unit and the MCU to process the SDI signal. However, the SDI signal transmission rate is very high, and the signal processing circuit affects its impedance matching and the system's EMI characteristics, which in turn affects the SoC's interpretation of the SDI signal. Therefore, after receiving the standby notification, the MCU must not only control the display device to enter standby mode but also send a connection instruction to the display device's signal processing circuit. Specifically, only when the display device is in standby mode will the signal processing circuit be instructed to connect to the SDI unit. This allows the signal processing circuit to process the SDI signal, thus preventing the display device from affecting SDI signal interpretation when the device is operating.

[0125] In some embodiments, before controlling the display device to enter the standby state, it is also necessary to determine whether the SoC has completed data saving.

[0126] Step S1202: If the DP signal input status indication is not input and the VGA signal input status indication is not input, the SDI signal input status is determined based on the second SDI signal sent by the signal processing circuit received within a preset time length; wherein the second SDI signal is obtained by the signal processing circuit adjusting the voltage of the first SDI signal.

[0127] In this embodiment, once the MCU determines that any of the SDI, DP, and VGA signal input states indicates input, the MCU needs to power on the SoC again. If the DP signal input state indicates no input and the VGA signal input state indicates no input, the MCU also needs to determine whether the SDI signal input state indicates input.

[0128] Since the SDI signal is random and its amplitude fluctuates within a certain range, the MCU can more accurately detect the SDI signal input status based on the second SDI signal received within a preset duration, and then determine whether to control the display device to enter the working state.

[0129] Step S1203: Determine whether to control the display device to enter a working state based on the SDI signal input state.

[0130] In the above solution, since the SDI signal is a high-frequency, low-amplitude signal, a signal processing circuit is added between the SDI unit and the MCU to adjust the voltage of the SDI signal, allowing the MCU to more accurately capture the SDI signal. Since the SDI signal is random and the amplitude fluctuates within a certain range, the MCU performs signal detection based on the second SDI signal received within a preset duration and accurately controls the display device to enter the working state. In addition, the signal processing circuit will only connect to the SDI unit and process the SDI signal when the display device is on standby, avoiding affecting the SDI signal analysis when the display device is working.

[0131] This embodiment does not specifically limit the method for determining the SDI signal input status. In some optional implementations, the method may be, but is not limited to, Figure 13 The following method is implemented:

[0132] Step S1301: comparing the average value corresponding to each sub-period within a preset time period with the target voltage peak value and the target voltage valley value respectively.

[0133] The average value corresponding to any sub-period is the voltage average value of the second SDI signal received in the sub-period.

[0134] In implementation, the sampling frequency of the ADC conversion pin is low, so the voltage average value of the second SDI signal received in a sub-period can be used as the voltage value of the sub-period;

[0135] The effective SDI signal will have relatively obvious fluctuations. Therefore, the average value corresponding to each sub-period can be compared with the target voltage peak value and the target voltage valley value to determine whether the fluctuation of the average value of all sub-periods within the preset time length is obvious.

[0136] There are 8 sub-periods in the exemplary preset time length, which are recorded as sub-period 1, sub-period 2, sub-period 3, sub-period 4, sub-period 5, sub-period 6, sub-period 7 and sub-period 8; N second SDI signals are received in each sub-period; wherein, the voltage of the second SDI signal received in sub-period 1 is A 11 、A 12 、A 13 、……、A 1N , the voltage value of sub-period 1 is A1=(A 11 +A 12 +A 13 +……+A 1N ) / N;

[0137] The voltages of the second SDI signal received in sub-period 2 are A 21 、A 22 、A 23 、……、A 2N, the voltage value of sub-period 2 is A2=(A 21 +A 22 +A 23 +……+A 2N ) / N;

[0138] The voltages of the second SDI signal received in sub-period 3 are A 31 、A 32 、A 33 、……、A 3N , the voltage value of sub-period 3 is A3=(A 31 +A 32 +A 33 +……+A 3N ) / N;

[0139] The voltages of the second SDI signal received in sub-period 4 are A 41 、A 42 、A 43 、……、A 4N , the voltage value of sub-period 4 is A4=(A 41 +A 42 +A 43 +……+A 4N ) / N;

[0140] The voltages of the second SDI signal received in sub-period 5 are A 51 、A 52 、A 53 、……、A 5N , the voltage value of sub-period 5 is A5=(A 51 +A 52 +A 53 +……+A 5N ) / N;

[0141] The voltages of the second SDI signal received in sub-period 6 are A 61 、A 62 、A 63 、……、A 6N , the voltage value of sub-period 6 A6=(A 61 +A 62 +A 63 +……+A 6N ) / N;

[0142] The voltages of the second SDI signal received in sub-period 7 are A 71 、A 72 、A 73 、……、A 7N , the voltage value of sub-period 7 is A7=(A 71 +A 72 +A 73+……+A 7N ) / N;

[0143] The voltages of the second SDI signal received in sub-period 8 are A 81 、A 82 、A 83 、……、A 8N , the voltage value of sub-period 8 is A8=(A 81 +A 82 +A 83 +……+A 8N ) / N.

[0144] Compare A1 with the target voltage peak and target voltage valley values ​​respectively; compare A2 with the target voltage peak and target voltage valley values ​​respectively; compare A3 with the target voltage peak and target voltage valley values ​​respectively; compare A4 with the target voltage peak and target voltage valley values ​​respectively; compare A5 with the target voltage peak and target voltage valley values ​​respectively; compare A6 with the target voltage peak and target voltage valley values ​​respectively; compare A7 with the target voltage peak and target voltage valley values ​​respectively; compare A8 with the target voltage peak and target voltage valley values ​​respectively.

[0145] Step S1302: determining, based on the comparison result, a first number of times that the average value corresponding to the sub-period is greater than the target voltage peak value, and a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value.

[0146] In implementation, if the average value corresponding to the sub-period is greater than the target voltage peak value more times, and the average value corresponding to the sub-period is less than the target voltage valley value more times, it means that the second SDI signal fluctuates more significantly within the preset time length;

[0147] Based on this, the first number of times the average value corresponding to the sub-period is greater than the target voltage peak value can be determined. If the first number exceeds the preset number, it means that the average value corresponding to the sub-period is greater than the target voltage peak value a large number of times;

[0148] further determining a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value; if the second number also exceeds the preset number, it indicates that the average value corresponding to the sub-period is less than the target voltage valley value a large number of times;

[0149] When the above two conditions are met, it can be determined that the second SDI signal fluctuates significantly within the preset time period, thereby determining that the SDI signal input state represents input.

[0150] Still taking the above-mentioned sub-periods 1, 2, 3, 4, 5, 6, 7, and 8 as an example, the target voltage peak is denoted as B, and the target voltage valley is denoted as C; if A1>B, that is, the average value of sub-period 1 is greater than the target voltage peak; A2<C, that is, the average value of sub-period 2 is less than the target voltage valley; A3>B, that is, the average value of sub-period 3 is greater than the target voltage peak; A4<C, that is, the average value of sub-period 4 is less than the target voltage valley; A5>B, that is, the average value of sub-period 5 is greater than the target voltage peak; A6<C, that is, the average value of sub-period 6 is less than the target voltage valley; C<A7<B, that is, the average value of sub-period 7 is neither greater than the target voltage peak nor less than the target voltage valley; C<A8<B, that is, the average value of sub-period 8 is neither greater than the target voltage peak nor less than the target voltage valley; then there are 3 sub-periods whose corresponding average values ​​are greater than the target voltage peak, that is, the first number is 3, and there are 3 sub-periods whose corresponding average values ​​are less than the target voltage valley, that is, the second number is also 3.

[0151] Step S1303: If the first number exceeds a preset number and the second number exceeds the preset number, determining that the SDI signal input status indicates input; otherwise determining that the SDI signal input status indicates not input.

[0152] As described above, by determining the first number of times that the average value corresponding to the sub-period is greater than the target voltage peak value, if the first number exceeds the preset number, it means that the average value corresponding to the sub-period is greater than the target voltage peak value a large number of times;

[0153] further determining a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value; if the second number also exceeds the preset number, it indicates that the average value corresponding to the sub-period is less than the target voltage valley value a large number of times;

[0154] When the above two conditions are met, it can be determined that the second SDI signal fluctuates significantly within the preset time period, thereby determining that the SDI signal input state represents input.

[0155] On the contrary, if the first number does not exceed the preset number, it means that the average value corresponding to the sub-period is greater than the target voltage peak value less times; or

[0156] If the second number of times does not exceed the preset number of times, it means that the average value corresponding to the sub-period is less than the target voltage valley value for a small number of times;

[0157] When any of the above conditions is met, it can be determined that the second SDI signal does not fluctuate significantly within the preset time period, thereby determining that the SDI signal input state represents no input.

[0158] Still taking the above-mentioned sub-period 1, sub-period 2, sub-period 3, sub-period 4, sub-period 5, sub-period 6, sub-period 7 and sub-period 8 as an example, the first number is 3 and the second number is also 3. If the preset number is 2, it is determined that the second SDI signal fluctuates more obviously within the preset time length, and the SDI signal input status represents the input.

[0159] The above solution. Since the sampling frequency of the ADC conversion pin is low, the voltage average value of the second SDI signal received in a sub-period can be used as the voltage value of the sub-period; by determining the first number of times the average value corresponding to the sub-period is greater than the target voltage peak value, and the second number of times the average value corresponding to the sub-period is less than the target voltage valley value, if the first number exceeds the preset number, it means that the average value corresponding to the sub-period is greater than the target voltage peak value more often; if the second number also exceeds the preset number, it means that the average value corresponding to the sub-period is less than the target voltage valley value more often; after the above two conditions are met, it can be determined that the second SDI signal fluctuates significantly within the preset time length, thereby determining the input state representation of the SDI signal input.

[0160] The present application embodiment provides a second state control method, see Figure 14 As shown, the method includes:

[0161] Step S1401: In response to the standby notification, the display device is controlled to enter a standby state, and a connection instruction is sent to the signal processing circuit of the display device; so that the signal processing circuit is connected to the SDI unit of the display device based on the connection instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit.

[0162] The standby notification is triggered by the SoC in the display device, or the standby notification is triggered by a standby button connected to the MCU.

[0163] Step S1402: If the DP signal input status indication is not input and the VGA signal input status indication is not input, the SDI signal input status is determined based on the second SDI signal sent by the signal processing circuit received within a preset time length; wherein the second SDI signal is obtained by the signal processing circuit adjusting the voltage of the first SDI signal.

[0164] The specific implementation of steps S1401 to S1402 may refer to the above embodiment. For example, the first number of times that the average value corresponding to each sub-period within the preset time period is greater than the target voltage peak value is determined. If the first number exceeds the preset number, it means that the average value corresponding to the sub-period is greater than the target voltage peak value a large number of times.

[0165] further determining a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value; if the second number also exceeds the preset number, it indicates that the average value corresponding to the sub-period is less than the target voltage valley value a large number of times;

[0166] When the above two conditions are met, it can be determined that the second SDI signal fluctuates significantly within the preset time period, thereby determining that the SDI signal input state represents input.

[0167] On the contrary, if the first number does not exceed the preset number, it means that the average value corresponding to the sub-period is greater than the target voltage peak value less times; or

[0168] If the second number of times does not exceed the preset number of times, it means that the average value corresponding to the sub-period is less than the target voltage valley value for a small number of times;

[0169] When any of the above conditions is met, it can be determined that the second SDI signal does not fluctuate significantly within the preset time period, thereby determining that the SDI signal input state represents no input.

[0170] Step S1403: If the SDI signal input status indicates input, control the display device to enter a working state.

[0171] As mentioned above, once it is determined that an SDI signal, DP signal or VGA signal is connected, the MCU needs to power on the SoC again. Therefore, when the DP signal input status indication is not input and the VGA signal input status indication is not input, if the SDI signal input status indication is input, it is necessary to control the display device to enter the working state.

[0172] The present application embodiment provides a third state control method, see Figure 15 As shown, the method includes:

[0173] Step S1501: In response to the standby notification, the display device is controlled to enter a standby state, and a connection instruction is sent to the signal processing circuit of the display device; so that the signal processing circuit is connected to the SDI unit of the display device based on the connection instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit.

[0174] The standby notification is triggered by the SoC in the display device, or the standby notification is triggered by a standby button connected to the MCU.

[0175] Step S1502: If the DP signal input status indication is not input and the VGA signal input status indication is not input, the SDI signal input status is determined based on the second SDI signal sent by the signal processing circuit received within a preset time length; wherein the second SDI signal is obtained by the signal processing circuit adjusting the voltage of the first SDI signal.

[0176] The specific implementation of steps S1501 to S1502 can refer to the above embodiment and will not be repeated here. For example, the first number of times that the average value corresponding to each sub-period within the preset time period is greater than the target voltage peak value is determined. If the first number exceeds the preset number, it means that the average value corresponding to the sub-period is greater than the target voltage peak value for a large number of times;

[0177] further determining a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value; if the second number also exceeds the preset number, it indicates that the average value corresponding to the sub-period is less than the target voltage valley value a large number of times;

[0178] When the above two conditions are met, it can be determined that the second SDI signal fluctuates significantly within the preset time period, thereby determining that the SDI signal input state represents input.

[0179] On the contrary, if the first number does not exceed the preset number, it means that the average value corresponding to the sub-period is greater than the target voltage peak value less times; or

[0180] If the second number of times does not exceed the preset number of times, it means that the average value corresponding to the sub-period is less than the target voltage valley value for a small number of times;

[0181] When any of the above conditions is met, it can be determined that the second SDI signal does not fluctuate significantly within the preset time period, thereby determining that the SDI signal input state represents no input.

[0182] Step S1503: If the SDI signal input status indicates that the display device is not input, the display device is not controlled to enter the working state.

[0183] As mentioned above, once it is determined that an SDI signal, DP signal or VGA signal is connected, the MCU needs to power on the SoC again. Therefore, when the DP signal input status indicates no input and the VGA signal input status indicates no input, if the SDI signal input status also indicates no input, there is no need to control the display device to enter the working state.

[0184] The present application embodiment provides a fourth state control method, see Figure 16 As shown, the method includes:

[0185] Step S1601: In response to the standby notification, the display device is controlled to enter a standby state, and a connection instruction is sent to the signal processing circuit of the display device; so that the signal processing circuit is connected to the SDI unit of the display device based on the connection instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit.

[0186] The standby notification is triggered by the SoC in the display device, or the standby notification is triggered by a standby button connected to the MCU.

[0187] The specific implementation of step S1601 can refer to the above embodiment and will not be repeated here.

[0188] Step S1602: If the DP signal input state indicates input, or the VGA signal input state indicates input, then control the display device to enter a working state.

[0189] As mentioned above, once it is determined that an SDI signal, DP signal or VGA signal is connected, the MCU needs to repower the SoC. Therefore, when the DP signal input status indicates input, or the VGA signal input status indicates no input, it can be directly determined that the display device needs to be controlled to enter the working state.

[0190] The present application embodiment provides a fifth state control method, see Figure 17 As shown, the method includes:

[0191] Step S1701: In response to the standby notification, the display device is controlled to enter a standby state, and a connection instruction is sent to the signal processing circuit of the display device; so that the signal processing circuit is connected with the SDI unit of the display device based on the connection instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit.

[0192] The standby notification is triggered by the SoC in the display device, or the standby notification is triggered by a standby button connected to the MCU.

[0193] Step S1702: If the DP signal input status indication is not input and the VGA signal input status indication is not input, the SDI signal input status is determined based on the second SDI signal sent by the signal processing circuit received within a preset time length; wherein the second SDI signal is obtained by the signal processing circuit adjusting the voltage of the first SDI signal.

[0194] Step S1703: Determine whether to control the display device to enter the working state based on the SDI signal input state.

[0195] The specific implementation of steps S1701 to S1703 can refer to the above embodiment and will not be repeated here.

[0196] Step S1704: If the display device is controlled to enter the working state, a disconnection instruction is sent to the signal processing circuit, so that the signal processing circuit disconnects from the SDI unit based on the disconnection instruction.

[0197] During implementation, the signal processing circuit will affect the SoC's parsing of the SDI signal. The signal processing unit and the SDI unit will only be connected when the display device is in standby mode. Once it is determined that an SDI signal, DP signal or VGA signal is connected, the MCU needs to power on the SoC again. At this time, the connection between the SDI unit and the signal processing circuit needs to be disconnected to prevent the signal processing circuit from affecting the SoC's parsing of the SDI signal.

[0198] In the above solution, the MCU triggers a disconnection instruction when it determines that the display device starts working. After the signal processing circuit receives the disconnection instruction sent by the MCU, it disconnects from the SDI unit, thereby preventing the signal processing circuit from affecting the SoC's analysis of the SDI signal.

[0199] Of course, the above different embodiments can be combined, and several specific examples are used below to illustrate.

[0200] Example 1

[0201] Step 1: The MCU controls the display device to enter a standby state in response to the standby notification, and sends a connection instruction to the on-off control unit in the signal processing circuit;

[0202] Step 2: The on-off control unit connects the signal processing unit and the SDI unit of the display device in response to the connection instruction;

[0203] Step 3: After receiving the first SDI signal sent by the SDI unit, the signal processing unit adjusts the voltage of the first SDI signal and sends the adjusted second SDI signal to the MCU;

[0204] Step 4: After determining that the DP signal input status indication is not input and the VGA signal input status indication is not input, the MCU determines the SDI signal input status based on the second SDI signal received within a preset time period;

[0205] Step 5: The MCU determines whether to control the display device to enter the working state based on the SDI signal input status.

[0206] Example 2

[0207] Step 1: The MCU controls the display device to enter a standby state in response to the standby notification, and sends a connection instruction to the on-off control unit in the signal processing circuit;

[0208] Step 2: The on-off control unit connects the signal processing unit and the SDI unit of the display device in response to the connection instruction;

[0209] Step 3: After receiving the first SDI signal sent by the SDI unit, the signal processing unit adjusts the voltage of the first SDI signal and sends the adjusted second SDI signal to the MCU;

[0210] Step 4: After determining that the DP signal input state indication is not input and the VGA signal input state indication is not input, the MCU compares the average value corresponding to each sub-period within the preset time length with the target voltage peak value and the target voltage valley value respectively;

[0211] Step 5: The MCU determines, based on the comparison result, a first number of times that the average value corresponding to the sub-period is greater than the target voltage peak value, and a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value;

[0212] Step 6: If the first number exceeds the preset number and the second number exceeds the preset number, the MCU determines that the SDI signal input state indicates input; otherwise, the MCU determines that the SDI signal input state indicates not input;

[0213] Step 7: If the SDI signal input status indicates input, the MCU controls the display device to enter the working state; if the SDI signal input status indicates no input, the MCU does not control the display device to enter the working state.

[0214] Example 3

[0215] Step 1: The MCU controls the display device to enter a standby state in response to the standby notification, and sends a connection instruction to the on-off control unit in the signal processing circuit;

[0216] Step 2: The on-off control unit connects the signal processing unit and the SDI unit of the display device in response to the connection instruction;

[0217] Step 3: After receiving the first SDI signal sent by the SDI unit, the signal processing unit adjusts the voltage of the first SDI signal and sends the adjusted second SDI signal to the MCU;

[0218] Step 4: If the MCU determines that the DP signal input state represents input, or the VGA signal input state represents input, there is no need to determine the SDI signal input state based on the second SDI signal, but directly control the display device to enter the working state.

[0219] Example 4

[0220] Step 1: The MCU controls the display device to enter a standby state in response to the standby notification, and sends a connection instruction to the on-off control unit in the signal processing circuit;

[0221] Step 2: The on-off control unit connects the signal processing unit and the SDI unit of the display device in response to the connection instruction;

[0222] Step 3: After receiving the first SDI signal sent by the SDI unit, the signal processing unit adjusts the voltage of the first SDI signal and sends the adjusted second SDI signal to the MCU;

[0223] Step 4: After determining that the DP signal input status indication is not input and the VGA signal input status indication is not input, the MCU determines the SDI signal input status based on the second SDI signal received within a preset time period;

[0224] Step 5: If the MCU determines to control the display device to enter the working state based on the SDI signal input state, a disconnection instruction is sent to the on-off control unit in the signal processing circuit;

[0225] Step 6: The on-off control unit disconnects the SDI unit from the signal processing unit in response to the disconnection instruction sent by the MCU.

[0226] The above examples are only intended to more clearly illustrate the overall process of state control of the display device, but this application does not make any specific limitations on this.

[0227] Based on the same inventive concept, the present application embodiment provides a first state control device, see Figure 18 As shown, the state control device 1800 includes a connectivity control module 1801 and a state processing module 1802; wherein:

[0228] The connectivity control module 1801 is used to control the display device to enter a standby state in response to a standby notification, and to send a connectivity instruction to the signal processing circuit of the display device; so that the signal processing circuit is connected to the SDI unit of the display device based on the connectivity instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit; wherein the standby notification is triggered by the SoC in the display device, or the standby notification is triggered by the standby button connected to the MCU.

[0229] a state processing module 1802 configured to determine an SDI signal input state based on a second SDI signal sent by the signal processing circuit and received within a preset time period if the DP signal input state indication is not input and the VGA signal input state indication is not input; wherein the second SDI signal is obtained by the signal processing circuit by adjusting the voltage of the first SDI signal;

[0230] The state processing module 1802 is further configured to determine whether to control the display device to enter a working state based on the SDI signal input state.

[0231] In some optional implementations, the state processing module 1802 is specifically configured to:

[0232] Compare the average value corresponding to each sub-period within the preset time length with the target voltage peak value and the target voltage valley value respectively; wherein the average value corresponding to any sub-period is the voltage average value of the second SDI signal received in the sub-period;

[0233] Determine, based on the comparison result, a first number of times that the average value corresponding to the sub-period is greater than the target voltage peak value, and a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value;

[0234] If the first number exceeds a preset number and the second number exceeds the preset number, determining that the SDI signal input state indicates input; otherwise determining that the SDI signal input state indicates not input;

[0235] If the SDI signal input status indicates input, the display device is controlled to enter a working state; if the SDI signal input status indicates no input, the display device is not controlled to enter a working state.

[0236] In some optional implementations, the state processing module 1802 is further configured to:

[0237] If the DP signal input state indicates input, or the VGA signal input state indicates input, the display device is controlled to enter a working state.

[0238] The present application embodiment provides a second state control device, see Figure 19 As shown, the state control device 1900 further includes a disconnection control module 1803 based on the state control device 1800; if the display device is controlled to enter the working state, the disconnection control module 1803 is used to:

[0239] A disconnection instruction is sent to the signal processing circuit, so that the signal processing circuit disconnects from the SDI unit based on the disconnection instruction.

[0240] Since the above-mentioned device is the device in the method in the embodiment of the present application, and the principle of solving the problem by the device is similar to that of the method, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0241] Based on the same technical concept, the embodiment of the present application also provides an MCU2000, such as Figure 20 As shown, it includes at least one processor 2001 and a memory 2002 connected to the at least one processor. In the embodiment of the present application, the specific connection medium between the processor 2001 and the memory 2002 is not limited. Figure 20 For example, the processor 2001 and the memory 2002 are connected via bus 2003. Buses can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 20 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0242] The processor 2001 is the control center of the MCU and can connect various parts of the MCU using various interfaces and lines. It can perform data processing by running or executing instructions stored in the memory 2002 and calling data stored in the memory 2002. Optionally, the processor 2001 may include one or more processing units.

[0243] The processor 2001 may be a general-purpose processor, which may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiment of the state control method may be directly implemented as being executed by a hardware processor, or as being executed by a combination of hardware and software modules in the processor.

[0244] The memory 2002 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs, and modules. The memory 2002 may include at least one type of storage medium. The memory 2002 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited to such. The memory 2002 in the embodiments of the present application may also be a circuit or any other device capable of performing a storage function, for storing program instructions and / or data.

[0245] In the embodiment of the present application, the memory 2002 stores a computer program. When the program is executed by the processor 2001, the processor 2001 executes:

[0246] In response to a standby notification, the display device is controlled to enter a standby state, and a connection instruction is sent to a signal processing circuit of the display device; so that the signal processing circuit is connected to the SDI unit of the display device based on the connection instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit; wherein the standby notification is triggered by the SoC in the display device, or the standby notification is triggered by a standby button connected to the MCU.

[0247] If the DP signal input state indication is not input and the VGA signal input state indication is not input, determining the SDI signal input state based on a second SDI signal sent by the signal processing circuit and received within a preset time period; wherein the second SDI signal is obtained by the signal processing circuit adjusting the voltage of the first SDI signal;

[0248] Based on the SDI signal input status, it is determined whether to control the display device to enter a working state.

[0249] In some optional implementations, the processor 2001 specifically performs:

[0250] Compare the average value corresponding to each sub-period within the preset time length with the target voltage peak value and the target voltage valley value respectively; wherein the average value corresponding to any sub-period is the voltage average value of the second SDI signal received in the sub-period;

[0251] Determine, based on the comparison result, a first number of times that the average value corresponding to the sub-period is greater than the target voltage peak value, and a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value;

[0252] If the first number exceeds a preset number and the second number exceeds the preset number, determining that the SDI signal input state indicates input; otherwise determining that the SDI signal input state indicates not input;

[0253] If the SDI signal input status indicates input, the display device is controlled to enter a working state; if the SDI signal input status indicates no input, the display device is not controlled to enter a working state.

[0254] In some optional implementations, the processor 2001 further executes:

[0255] If the DP signal input state indicates input, or the VGA signal input state indicates input, the display device is controlled to enter a working state.

[0256] In some optional implementations, if the display device is controlled to enter a working state, the processor 2001 further executes:

[0257] A disconnection instruction is sent to the signal processing circuit, so that the signal processing circuit disconnects from the SDI unit based on the disconnection instruction.

[0258] Since the MCU is the MCU in the method in the embodiment of the present application, and the principle of solving the problem by the MCU is similar to that of the method, the implementation of the MCU can refer to the implementation of the method, and the repeated parts will not be repeated.

[0259] Based on the same technical concept, an embodiment of the present application further provides a computer-readable storage medium storing a computer program executable by a computer. When the program is run on the computer, the computer is caused to execute:

[0260] In response to the standby notification, the display device is controlled to enter a standby state, and a connection instruction is sent to a signal processing circuit of the display device; so that the signal processing circuit is connected to the SDI unit of the display device based on the connection instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit; wherein the standby notification is triggered by the SoC in the display device, or the standby notification is triggered by a standby button connected to the MCU;

[0261] If the DP signal input state indication is not input and the VGA signal input state indication is not input, determining the SDI signal input state based on a second SDI signal sent by the signal processing circuit and received within a preset time period; wherein the second SDI signal is obtained by the signal processing circuit adjusting the voltage of the first SDI signal;

[0262] Based on the SDI signal input status, it is determined whether to control the display device to enter a working state.

[0263] In some optional implementations, the computer specifically performs:

[0264] Compare the average value corresponding to each sub-period within the preset time length with the target voltage peak value and the target voltage valley value respectively; wherein the average value corresponding to any sub-period is the voltage average value of the second SDI signal received in the sub-period;

[0265] Determine, based on the comparison result, a first number of times that the average value corresponding to the sub-period is greater than the target voltage peak value, and a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value;

[0266] If the first number exceeds a preset number and the second number exceeds the preset number, determining that the SDI signal input state indicates input; otherwise determining that the SDI signal input state indicates not input;

[0267] Determining whether to control the display device to enter a working state based on the SDI signal input state includes:

[0268] If the SDI signal input status indicates input, the display device is controlled to enter a working state; if the SDI signal input status indicates no input, the display device is not controlled to enter a working state.

[0269] In some optional implementations, the computer further executes:

[0270] If the DP signal input state indicates input, or the VGA signal input state indicates input, the display device is controlled to enter a working state.

[0271] In some optional implementations, if the display device is controlled to enter a working state, the computer further executes:

[0272] A disconnection instruction is sent to the signal processing circuit, so that the signal processing circuit disconnects from the SDI unit based on the disconnection instruction.

[0273] In some optional embodiments, various aspects of the state control method provided in this application may also be implemented in the form of a program product, which includes computer-executable instructions. When the program product is run on a computer device, the computer-executable instructions are used to cause the computer device to execute:

[0274] In response to the standby notification, the display device is controlled to enter a standby state, and a connection instruction is sent to a signal processing circuit of the display device; so that the signal processing circuit is connected to the SDI unit of the display device based on the connection instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit; wherein the standby notification is triggered by the SoC in the display device, or the standby notification is triggered by a standby button connected to the MCU;

[0275] If the DP signal input state indication is not input and the VGA signal input state indication is not input, determining the SDI signal input state based on a second SDI signal sent by the signal processing circuit and received within a preset time period; wherein the second SDI signal is obtained by the signal processing circuit adjusting the voltage of the first SDI signal;

[0276] Based on the SDI signal input status, it is determined whether to control the display device to enter a working state.

[0277] In some optional implementations, the computer specifically performs:

[0278] Compare the average value corresponding to each sub-period within the preset time length with the target voltage peak value and the target voltage valley value respectively; wherein the average value corresponding to any sub-period is the voltage average value of the second SDI signal received in the sub-period;

[0279] Determine, based on the comparison result, a first number of times that the average value corresponding to the sub-period is greater than the target voltage peak value, and a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value;

[0280] If the first number exceeds a preset number and the second number exceeds the preset number, determining that the SDI signal input state indicates input; otherwise determining that the SDI signal input state indicates not input;

[0281] Determining whether to control the display device to enter a working state based on the SDI signal input state includes:

[0282] If the SDI signal input status indicates input, the display device is controlled to enter a working state; if the SDI signal input status indicates no input, the display device is not controlled to enter a working state.

[0283] In some optional implementations, the computer further executes:

[0284] If the DP signal input state indicates input, or the VGA signal input state indicates input, the display device is controlled to enter a working state.

[0285] In some optional implementations, if the display device is controlled to enter a working state, the computer further executes:

[0286] A disconnection instruction is sent to the signal processing circuit, so that the signal processing circuit disconnects from the SDI unit based on the disconnection instruction.

[0287] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, devices (equipment), or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0288] The present application is described with reference to the flowcharts and / or block diagrams of the methods, apparatus (devices) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0289] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0290] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0291] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0292] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A signal processing circuit, characterized in that: include: an on-off control unit, configured to connect the signal processing unit and the SDI unit of the display device in response to a connection instruction sent by the MCU; wherein the connection instruction is triggered by the MCU when the display device starts to be in standby mode; a signal processing unit, configured to adjust the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit, and send the adjusted second SDI signal to the MCU, so that the MCU determines whether to control the display device to enter a working state based on the second SDI signal received within a preset time period; The signal processing unit includes a DC component elimination subunit and a boost subunit, wherein the DC component elimination subunit is connected to one end of the on-off control unit, and the SDI unit is connected to the other end of the on-off control unit; the boost subunit is respectively connected to the DC component elimination subunit and the analog-to-digital converter conversion pin in the MCU; The DC component elimination subunit is configured to, after receiving the first SDI signal sent by the SDI unit, remove the DC component from the first SDI signal to obtain a third SDI signal; and send the third SDI signal to the boost subunit; The boost subunit is configured to add a DC bias voltage to the third SDI signal to obtain the second SDI signal, and send the second SDI signal to the MCU via the analog-to-digital converter conversion pin.

2. The signal processing circuit according to claim 1, wherein The DC component elimination subunit includes a coupling capacitor; the boost subunit includes a bias resistor; The input end of the coupling capacitor is connected to one end of the on-off control unit for receiving the first SDI signal sent by the SDI unit; the output end of the coupling capacitor is connected to the input end of the bias resistor for sending the third SDI signal to the bias resistor; The power end of the bias resistor is connected to the power supply, and is used to obtain the DC bias voltage by voltage division from the power supply; the output end of the bias resistor is connected to the analog-to-digital converter conversion pin, and is used to send the second SDI signal to the analog-to-digital converter conversion pin in the MCU.

3. The signal processing circuit according to claim 1, wherein: The DC bias voltage is the median of a sampling range of a conversion pin of an analog-to-digital converter in the MCU; or The DC bias voltage is the difference between the median of the sampling range of the analog-to-digital converter conversion pin in the MCU and a preset deviation; or The DC bias voltage is the sum of the median of the sampling range of the analog-to-digital converter conversion pin in the MCU and the preset deviation.

4. The signal processing circuit according to any one of claims 1 to 3, wherein: The on-off control unit is further used for: In response to a disconnection instruction sent by the MCU, the connection between the SDI unit and the signal processing unit is disconnected; wherein the disconnection instruction is triggered by the MCU when it determines that the display device starts to work.

5. A state control method, characterized in that: An MCU applied to a display device, the method comprising: In response to the standby notification, the display device is controlled to enter a standby state, and a connection instruction is sent to a signal processing circuit of the display device; so that the signal processing circuit is connected to the SDI unit of the display device based on the connection instruction, and adjusts the voltage of the first SDI signal after receiving the first SDI signal sent by the SDI unit; wherein the standby notification is triggered by the SoC in the display device, or the standby notification is triggered by a standby button connected to the MCU; If the DP signal input state indication is not input and the VGA signal input state indication is not input, determining the SDI signal input state based on a second SDI signal sent by the signal processing circuit and received within a preset time period; wherein the second SDI signal is obtained by the signal processing circuit adjusting the voltage of the first SDI signal; Based on the SDI signal input status, it is determined whether to control the display device to enter a working state.

6. The method according to claim 5, wherein Determining an SDI signal input state based on a second SDI signal sent by the signal processing circuit and received within a preset time period includes: Compare the average value corresponding to each sub-period within the preset time length with the target voltage peak value and the target voltage valley value respectively; wherein the average value corresponding to any sub-period is the voltage average value of the second SDI signal received in the sub-period; Determine, based on the comparison result, a first number of times that the average value corresponding to the sub-period is greater than the target voltage peak value, and a second number of times that the average value corresponding to the sub-period is less than the target voltage valley value; If the first number exceeds a preset number and the second number exceeds the preset number, determining that the SDI signal input state indicates input; otherwise determining that the SDI signal input state indicates not input; Determining whether to control the display device to enter a working state based on the SDI signal input state includes: If the SDI signal input status indicates input, the display device is controlled to enter a working state; if the SDI signal input status indicates no input, the display device is not controlled to enter a working state.

7. The method according to claim 5, wherein The method further comprises: If the DP signal input state indicates input, or the VGA signal input state indicates input, the display device is controlled to enter a working state.

8. The method according to claim 6 or 7, wherein: If the display device is controlled to enter a working state, the method further includes: A disconnection instruction is sent to the signal processing circuit, so that the signal processing circuit disconnects from the SDI unit based on the disconnection instruction.

9. A display device, characterized in that: The method comprises the signal processing circuit according to any one of claims 1 to 4.

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