A control device and method for a vehicle-mounted central control display screen

Abstract

The present invention provides a control device and method for a vehicle-mounted central control display screen. The control device includes: a display screen, a main controller, a power converter connected to the display screen and the main controller respectively, an OR gate circuit, and a first signal control terminal; wherein the main controller outputs a second enable signal according to an externally input power-on / off signal; the first signal control terminal obtains a first enable signal according to an externally input power-on / off signal; the OR gate circuit is connected to the main controller and the first signal control terminal respectively, and is configured to receive the second enable signal sent by the main controller and the first enable signal sent by the first signal control terminal to generate a first control signal of different level states; the power converter is connected to the OR gate circuit, and is configured to receive the first control signal so that the power converter supplies or disconnects the power supply voltage to the main controller and the display screen. The scheme of the present invention realizes the power-on and power-off control of the entire vehicle-mounted central control display screen, and the static current is low.

Description

Technical Field

[0001] The present invention relates to the technical field of in-vehicle infotainment products, and in particular to a control device and method for an in-vehicle central control display screen. Background Art

[0002] With the increase of vehicle-mounted electronic devices, the load on vehicle batteries is getting larger and larger. Therefore, it is required to reduce the static current of vehicle-mounted electronic devices as much as possible to adapt to the growth of power consumption demand. However, for the vehicle-mounted central stack display (CSD), the power on and off of its display devices (such as liquid crystal displays) have strict timing requirements. Therefore, when designing the vehicle-mounted central stack display, how to achieve low static current while ensuring power on and off control has become an urgent problem to be solved. Summary of the invention

[0003] In view of the above problems, the present invention is proposed to provide a control device and method for a vehicle-mounted central control display screen that overcomes the above problems or at least partially solves the above problems.

[0004] An object of the present invention is to provide a control device for a vehicle-mounted central control display screen that can achieve low static current while ensuring power-up and power-down control of the vehicle-mounted central control display screen.

[0005] In particular, according to one aspect of an embodiment of the present invention, a control device for a vehicle-mounted central control display screen is provided, comprising a display screen, a main controller, a power converter connected to the display screen and the main controller respectively, an OR gate circuit, and a first signal control terminal; wherein,

[0006] The main controller outputs a second enable signal according to an external power on / off signal;

[0007] The first signal control terminal obtains a first enable signal according to an external input power on / off signal;

[0008] The OR gate circuit is connected to the main controller and the first signal control terminal respectively, and is configured to receive the second enable signal sent by the main controller and the first enable signal sent by the first signal control terminal to generate a first control signal with different level states;

[0009] The power converter is connected to the OR gate circuit and is configured to receive the first control signal to enable the power converter to supply or cut off the power voltage to the main controller and the display screen.

[0010] Optionally, the power converter is connected to the vehicle power supply and is configured to convert the voltage output by the vehicle power supply into the power supply voltage and output it to the main controller and the display screen;

[0011] The main controller is connected to the display screen, and is configured to start up according to an externally input power-on signal and the power supply voltage supplied by the power converter to output the second enable signal in a first level state, and to power off the display screen according to an externally input power-off signal, and to output the second enable signal in a second level state after the display screen is powered off.

[0012] Optionally, the control device also includes

[0013] A level converter, the level converter having a second signal control terminal and the first signal control terminal;

[0014] The second signal control terminal is connected to the main controller and is configured to generate a second control signal of different level states according to an external input power on / off signal and send it to the main controller;

[0015] The first signal control terminal is connected to the OR gate circuit and is configured to generate a first enable signal with different level states based on an external input power on / off signal and send it to the OR gate circuit.

[0016] Optionally, the different level states of the first enable signal include a third level state and a fourth level state, the different level states of the first control signal include a fifth level state and a sixth level state, and the different level states of the second control signal include a seventh level state and an eighth level state;

[0017] The level converter is further configured to generate the second control signal of the seventh level state and the first enable signal of the third level state based on an externally input power-on signal, or to generate the second control signal of the eighth level state and the first enable signal of the fourth level state based on an externally input power-off signal;

[0018] The OR gate circuit is further configured to generate the first control signal in the fifth level state according to the second enable signal in the first level state sent by the main controller and the first enable signal in the third level state or the fourth level state sent by the first signal control terminal, or to generate the first control signal in the sixth level state according to the second enable signal in the second level state sent by the main controller and the first enable signal in the fourth level state sent by the first signal control terminal;

[0019] The power converter is further configured to supply the power voltage to the main controller and the display screen in response to the first control signal in the fifth level state, or disconnect the power voltage from the main controller and the display screen in response to the first control signal in the sixth level state;

[0020] The main controller is also configured to receive the power supply voltage supplied by the power converter and respond to the second control signal of the seventh level state, output the second enable signal of the first level state to the OR gate circuit, or respond to the second control signal of the eighth level state to power off the display screen, and output the second enable signal of the second level state to the OR gate circuit after the display screen is powered off.

[0021] Optionally, the first level state, the third level state, the fifth level state and the seventh level state are high levels, and the second level state, the fourth level state, the sixth level state and the eighth level state are low levels.

[0022] Optionally, the level converter is connected to the vehicle power supply to obtain the vehicle power supply voltage;

[0023] The level converter comprises:

[0024] A transistor, wherein the base of the transistor is configured to receive the power on / off signal input from the outside;

[0025] a first resistor, wherein two ends of the first resistor are respectively connected to the vehicle-mounted power supply and the collector of the transistor; and

[0026] A second resistor, one end of the second resistor is connected to the emitter of the transistor to form an output connection point as the first signal control end and / or the second signal control end, and the other end of the second resistor is grounded.

[0027] Optionally, the OR gate circuit includes:

[0028] a third resistor, one end of which is connected to the first signal control end to receive the first enable signal;

[0029] a first diode, wherein an anode of the first diode is connected to the other end of the third resistor;

[0030] a fourth resistor, one end of which is connected to the main controller to receive the second enable signal; and

[0031] A second diode, wherein the anode and cathode of the second diode are respectively connected to the other end of the fourth resistor and the cathode of the first diode, wherein the connection point between the cathode of the second diode and the cathode of the first diode is connected to the power converter to output the first control signal.

[0032] Optionally, the control device further includes:

[0033] A deserializer, connected to the main controller, the power converter and the display screen respectively;

[0034] The power converter is further configured to supply a power supply voltage to the deserializer to power on the deserializer;

[0035] The deserializer is configured to decode the received first video signal into a second video signal based on a third control signal from the main controller after power-on, and output the second video signal to the display screen.

[0036] According to another aspect of an embodiment of the present invention, a method for controlling a vehicle-mounted central control display screen on power-on is further provided. Based on the control device for a vehicle-mounted central control display screen as described in any one of the above, the control method comprises:

[0037] According to the external input power-on signal, the first signal control terminal outputs a first enable signal of a high level;

[0038] The OR gate circuit generates a high-level first control signal according to the high-level first enable signal, and outputs the high-level first control signal to the power converter to change the power converter from a shutdown state to a working state to supply power to the main controller and the display screen;

[0039] The main controller switches from a shutdown state to a startup state in response to the power-on signal to control the display screen, and outputs a high-level second enable signal to the OR gate circuit.

[0040] According to another aspect of an embodiment of the present invention, a method for controlling power-off of a vehicle-mounted central control display screen is provided. Based on the control device for the vehicle-mounted central control display screen described in any one of the above, the control method includes:

[0041] According to the shutdown signal input from the outside, the first signal control terminal outputs a first enable signal of a low level;

[0042] According to the shutdown signal input externally, the main controller performs a power-off operation on the display screen according to a preset power-off timing, and then converts the second enable signal from a high level to a low level;

[0043] The OR gate circuit generates a low-level first control signal according to the low-level first enable signal and the low-level second enable signal, and outputs the low-level first control signal to the power converter to turn off the power converter.

[0044] In the control device and method of the vehicle-mounted central control display screen provided by the present invention, the first control signal of different level states is generated by the OR gate circuit according to the second enable signal sent by the main controller and the first enable signal sent by the first signal control terminal, so that the power converter supplies or disconnects the power supply voltage to the main controller and the display screen through the first control signal of different level states, thereby realizing the power on and off control of the entire vehicle-mounted central control display screen. In addition, after the vehicle-mounted central control display screen is powered off, the main controller and the display screen are both disconnected from the power supply voltage (that is, no constant power supply is required), which can effectively prevent the increase of the leakage current of the vehicle-mounted central control display screen caused by environmental changes, thereby realizing low static current.

[0045] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below.

[0046] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0048] Figure 1 A schematic diagram showing the structure of a control device for a vehicle-mounted central control display screen according to an embodiment of the present invention is shown;

[0049] Figure 2 A schematic structural diagram of a control device for a vehicle-mounted central control display screen according to another embodiment of the present invention is shown;

[0050] Figure 3 A schematic diagram of the circuit structure of a level converter according to an embodiment of the present invention is shown;

[0051] Figure 4 A schematic diagram of the circuit structure of an OR gate circuit according to an embodiment of the present invention is shown;

[0052] Figure 5 A schematic diagram of power-off timing of an input and output interface of a display screen according to an embodiment of the present invention is shown;

[0053] Figure 6 A schematic flow chart of a method for controlling a vehicle-mounted central control display screen power-on according to an embodiment of the present invention is shown;

[0054] Figure 7 A schematic flow chart of a method for controlling power-off of a vehicle-mounted central control display screen according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0055] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0056] Currently, there is an urgent need for a control solution that can take into account both the power on and off control and low quiescent current of the vehicle-mounted hollow display screen.

[0057] In order to solve the above technical problems, an embodiment of the present invention provides a control device for a vehicle-mounted central control display screen. Figure 1 FIG. 1 shows a schematic diagram of the structure of a control device 10 for a vehicle-mounted central control display screen according to an embodiment of the present invention. Figure 1 As shown, the control device 10 of the vehicle-mounted central control display screen may generally include a display screen 100 , a main controller 200 , a power converter 300 , an OR gate circuit 500 and a first signal control terminal 401 .

[0058] The main controller 200 can output the second enable signal according to the external input power-on / off signal. The first signal control terminal 401 can obtain the first enable signal according to the external input power-on / off signal. In practical applications, for example, the external input power-on / off signal can be sent to the main controller 200 and the first signal control terminal 401 respectively through the power-on / off signal input terminal.

[0059] The OR circuit 500 is connected to the first signal control terminal 401 and the main controller 200 respectively. The OR circuit 500 receives the second enable signal from the main controller 200 and the first enable signal from the first signal control terminal 401, and generates a first control signal with different level states according to the second enable signal and the first enable signal.

[0060] The power converter 300 is connected to the OR gate circuit 500 and can receive the first control signal of different level states generated by the OR gate circuit 500. The power converter 300 is also connected to the main controller 200 and the display screen 100, so that the power converter 300 can supply or disconnect the power voltage to the main controller 200 and the display screen 100 according to the first control signal. Specifically, the first control signal of different level states can put the power converter 400 in a working state or a closed state. The power converter 400 can supply the power voltage to the main controller 200 and the display screen 100 in the working state, thereby realizing the power-on control of the entire vehicle-mounted central control display screen. The power converter 400 can disconnect the power voltage to the main controller 200 and the display screen 100 in the closed state, thereby realizing the power-off control of the entire vehicle-mounted central control display screen.

[0061] In the control device 10 of the vehicle-mounted central control display screen provided by the embodiment of the present invention, the first control signal of different level states is generated by the OR gate circuit 500 according to the second enable signal sent by the main controller 200 and the first enable signal sent by the first signal control terminal 401, so that the power converter 300 supplies or disconnects the power supply voltage to the main controller 200 and the display screen 100 through the first control signal of different level states, thereby realizing the power on and off control of the entire vehicle-mounted central control display screen. In addition, after the vehicle-mounted central control display screen is powered off (that is, the power converter 300 disconnects the power supply voltage), the main controller 200 and the display screen 100 are both disconnected from the power supply voltage (that is, no constant power supply is required), which can effectively prevent the increase of the leakage current of the vehicle-mounted central control display screen caused by environmental changes, thereby achieving low static current.

[0062] Figure 2 A schematic structural diagram of a control device 10 for a vehicle-mounted central control display screen according to another embodiment of the present invention is shown.

[0063] See also Figure 2In one embodiment, the power converter 300 is connected to the vehicle power supply 700, the main controller 200 and the display screen 100 respectively. The main controller 200 is connected to the display screen 100. In the working state, the power converter 300 can convert the voltage output by the vehicle power supply 700 into the working voltage (i.e., the aforementioned power supply voltage) required by the main controller 200 and the display screen 100 and other components, so as to output it to the main controller 200 and the display screen 100 and other components. Specifically, the power converter 300 converts the voltage output by the vehicle power supply 700 in the working state and outputs the converted voltage to the main controller 200 and the display screen 100, so as to power on the main controller 200 and the display screen 100. The main controller 200 starts (i.e., switches from the off state to the on state) in response to the power-on signal input externally and the power supply voltage output by the power converter 300 to control the display screen 100. The power converter 300 disconnects the power supply voltage to the main controller 200 and the display screen 100 in the off state. The vehicle power supply 700 can be a storage battery of the vehicle. Accordingly, the power converter 300 may be a DC-DC converter. The display screen 100 may be, for example, a liquid crystal display (LCD).

[0064] The main controller 200 is responsible for controlling the states, switch timing, etc. of the display screen 100, the power converter 300, and other devices. Specifically, after the main controller 200 is started, it outputs a second enable signal of a first level state to the OR gate circuit 500 in the startup state. When the main controller 200 receives a shutdown signal input from the outside, the main controller 200 powers off the display screen 100 according to the shutdown signal. After the display screen 100 is powered off, the main controller 200 outputs a second enable signal of a second level state to the OR gate circuit 500. The main controller 200 can specifically be a microcontroller unit (MCU). The main controller 200 and the display screen 100 can be connected via SPI (Serial Peripheral Interface) for signal transmission.

[0065] In one embodiment, continue to see Figure 2, the control device 10 of the vehicle-mounted central control display screen may also include a level shifter 400. The level shifter 400 has a first signal control terminal 401 and a second signal control terminal 402, the second signal control terminal 402 is connected to the main controller 200, and the first signal control terminal 401 is connected to the OR gate circuit 500. The level shifter 400 is responsible for converting the input power-on / off signal into an operating level acceptable to the CSD. Specifically, the first signal control terminal 401 generates a first enable signal with different level states according to the externally input power-on / off signal (the power-on / off signal may specifically include a power-on signal and a power-off signal), and sends the first enable signal to the OR gate circuit 500. The second signal control terminal 402 generates a second control signal with different level states according to the externally input power-on / off signal, and sends the second control signal to the main controller 200. The level shifter 400 may be connected to a vehicle bus (e.g., a CAN bus, a LIN bus, etc.) to receive the power-on / off signal input through the vehicle bus. It should be noted that, those skilled in the art should understand that, in the present embodiment, the external input power on / off signal is not sent directly to the main controller 200, but is first sent to the level converter 400, and after conversion by the level converter 400, a second control signal is generated and sent to the main controller 200 by the second signal control terminal 402 to control the opening and closing of the main controller 200.

[0066] In one embodiment, the different level states of the first enable signal mentioned above may include a third level state and a fourth level state. The different level states of the first control signal may include a fifth level state and a sixth level state. The different level states of the second control signal may include a seventh level state and an eighth level state. Specifically, when a power-on signal is input, the level converter 400 generates a second control signal of a seventh level state and a first enable signal of a third level state based on the externally input power-on signal. After receiving the first enable signal of a third level state sent by the level converter 400 through the first signal control terminal 401, the OR gate circuit 500 may generate a first control signal of a fifth level state. Furthermore, the power converter 300 is in a working state in response to the first control signal of the fifth level state, so as to convert the voltage from the vehicle power supply 700 into the power supply voltage required by the main controller 200 and the display screen 100 and supply it to the main controller 200 and the display screen 100, so that the main controller 200 and the display screen 100 are powered on. After receiving the second control signal of the seventh level state sent by the level converter 400 through the second signal control terminal 402, the main controller 200 starts in response to the second control signal of the seventh level state and the power supply voltage supplied by the power converter 300, and outputs the second enable signal of the first level state to the OR gate circuit 500 in the startup state. At this time, the OR gate circuit 500 still generates the first control signal of the fifth level state according to the second enable signal of the first level state and the first enable signal of the third level state sent by the signal control terminal 401, so that the power converter 300 is maintained in the working state. In this way, the power-on control of the vehicle-mounted central control display screen is realized.

[0067] When a shutdown signal is input, the level converter 400 generates a second control signal of an eighth level state and a first enable signal of a fourth level state based on the shutdown signal input externally. After receiving the second control signal of an eighth level state sent by the level converter 400 through the second signal control terminal 402, the main controller 200 performs a power-off operation on the display screen 100 in response to the second control signal of the eighth level state. During the power-off of the display screen 100, the second enable signal output by the main controller 200 remains unchanged at the first level state. Therefore, the OR gate circuit 500 generates a first control signal of a fifth level state based on the first enable signal of the fourth level state from the signal control terminal 401 of the level converter 400 and the second enable signal of the first level state from the main controller 200 to output to the power converter 300, so that the power converter 300 remains in the working state. After the display screen 100 is powered off, the main controller 200 outputs the second enable signal of the second level state to the OR gate circuit 500. At this time, the OR gate circuit 500 generates a first control signal of the sixth level state based on the first enable signal of the fourth level state from the signal control terminal 401 of the level converter 400 and the second enable signal of the second level state from the main controller 200 to output to the power converter 300, so that the power converter 300 is in the off state in response to the first control signal of the sixth level state to disconnect the power supply voltage output to the main controller 200 and the display screen 100. In this way, the power-off control of the vehicle-mounted central control display screen is realized.

[0068] Further, the first level state, the third level state, the fifth level state and the seventh level state mentioned above can be high level, and the second level state, the fourth level state, the sixth level state and the eighth level state can be low level. Correspondingly, the power-on signal can be a high level power-on signal, and the power-off signal can be a low level power-off signal.

[0069] The level converter 400 may be composed of a number of discrete components. Figure 3 As shown, the level converter 400 may include a transistor Q1, a first resistor R1 and a second resistor R2. Figure 3 The first resistor R1 is connected to the vehicle power supply 700 and the collector of the transistor Q1 (indicated by reference numeral 1 in the figure) to receive the power-on signal and the power-off signal inputted from the outside. Specifically, the base of the transistor Q1 can be connected to the vehicle bus to receive the power-on signal and the power-off signal inputted through the vehicle bus. The two ends of the first resistor R1 are connected to the vehicle power supply 700 and the collector of the transistor Q1 (indicated by reference numeral 1 in the figure) to receive the power-on signal and the power-off signal inputted from the outside. Specifically, the base of the transistor Q1 can be connected to the vehicle bus to receive the power-on signal and the power-off signal inputted through the vehicle bus. Figure 3 One end of the second resistor R2 is connected to the emitter of the transistor Q1 ( Figure 3The output connection point is connected to the main controller 200 (indicated by reference numeral 3 in the figure) to form an output connection point, which can be used as the first signal control terminal 401 and / or the second signal control terminal 402. Specifically, when the output connection point is used as the first signal control terminal 401, it is connected to the OR gate circuit 500 to output the first enable signal to the OR gate circuit 500. When the output connection point is used as the second signal control terminal 402, it is connected to the main controller 200 to output the second control signal to the main controller 200. The other end of the second resistor R2 is grounded. Through this design, the level conversion of the power-on signal and the power-off signal is realized with a simple circuit.

[0070] In one embodiment, referring to Figure 4 As shown, the OR gate circuit 500 may include a third resistor R3, a fourth resistor R4, a first diode D1 and a second diode D2. One end of the third resistor R3 is connected to the signal control terminal 401 to receive the first enable signal, and the other end is connected to the anode of the first diode D1. One end of the fourth resistor R4 is connected to the main controller 200 to receive the second enable signal, and the other end is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the cathode of the first diode D1, and the connection point between the cathode of the second diode D2 and the cathode of the first diode D1 is connected to the power converter 300, so as to output the first control signal to the power converter 300 through the connection point.

[0071] In one embodiment, when the main controller 200 performs a power-off operation on the display screen 100 , it can sequentially power off the input and output (I / O) interfaces of the display screen 100 according to a preset power-off sequence. Figure 5 FIG. 1 shows a schematic diagram of a power-off timing of an I / O interface of a display screen 100 according to an embodiment of the present invention. Figure 5 As shown, the main controller 200 sequentially powers off the backlight (BL) interface, the standby interface, the reset interface, and the power supply voltage (VDD) interface of the display screen 100 according to a preset power-off timing (specifically, the LCD module timing (LCM timing)). In a specific implementation, the interval between the power-off timing of the reset interface and the power-off timing of the power supply voltage interface is greater than 140ms to ensure that the display screen 100 is powered off normally.

[0072] The following takes the high-level power-on signal and the low-level power-off signal as an example. Figure 3 and Figure 4 The specific structures of the level converter 400 and the OR gate circuit 500 shown in the figure illustrate the operation process of the control device 10 for the vehicle-mounted central control display screen provided by the embodiment of the present invention.

[0073] When a high-level power-on signal input from the outside is received, since the power-on signal is at a high level, the transistor Q1 in the level converter 400 is turned on, and the corresponding high-level second control signal and the first enable signal are generated through the voltage division of the first resistor R1 and the second resistor R2. At this time, since the first enable signal is at a high level, a high-level first control signal is generated through the OR gate circuit 500, and then, the power converter 300 is in a working state in response to the high-level first control signal, and the voltage output by the vehicle power supply 700 is converted and output to the main controller 200 and the display screen (specifically, an LCD display screen) 100, so that the main controller 200 and the display screen 100 are powered on. After the main controller 200 is powered on, it responds to the received high-level second control signal to start, and the entire central control display screen starts to work. After the main controller 200 is started, it outputs a high-level second enable signal to the OR gate circuit 500.

[0074] When the display screen 100 enters the dormant state, the display screen 100 needs to be powered off. At this time, the level converter 400 receives the low-level shutdown signal input from the outside, and generates a low-level second control signal and a first enable signal based on the low-level shutdown signal. After receiving the low-level second control signal, the main controller 200 sequentially powers off the backlight interface, standby interface, reset interface and power supply voltage interface of the display screen 100 according to the LCM (LCD Module) timing requirements. During the period when the main controller 200 powers off the display screen 100, since the second enable signal output by the main controller 200 is still maintained at a high level, the first control signal generated by the OR gate circuit 500 is still in a high level state, and therefore, the power converter 300 is still in a working state at this time. After the power-off timing of the display screen 100 is completed, the main controller 200 outputs a low-level second enable signal to the OR gate circuit 500. At this time, since the first enable signal and the second enable signal are both in a low-level state, the OR gate circuit 500 generates a low-level first control signal. Then, the power converter 300 is in a closed state in response to the low-level first control signal to disconnect the voltage output to the main controller 200 and the display screen 100. The main controller 200 and the display screen 100 both enter a power-off state. The main controller 200 and the display screen 100 will not start working until the level converter 400 receives a high-level power-on signal again.

[0075] The control device 10 of the vehicle-mounted central control display screen in the embodiment of the present invention has a simple circuit structure, simplifies the power-on and power-off timing control operation of the display screen 100, has no permanent power supply components, and has a low static current.

[0076] In one embodiment, the level converter 400 may also be connected to a vehicle power supply 700. By using the vehicle power supply 700 of the vehicle itself to provide power for the level converter 400, no additional power supply is required, thereby further simplifying the structure of the entire control device 10.

[0077] Continue to see Figure 2 In one embodiment, the control device 10 of the vehicle-mounted central control display screen may further include a deserializer 600. The deserializer 600 may be connected to the main controller 200, the power converter 300 and the display screen 100, respectively. The power converter 300 supplies a power supply voltage to the deserializer 600 (specifically, outputs the converted power supply voltage to the deserializer 600 in a working state) to power on the deserializer 600. After power-on, the deserializer 600 decodes the received first video signal into a second video signal based on a third control signal from the main controller 200, and outputs the second video signal to the display screen 100, so that the display screen 100 displays based on the second video signal. Specifically, the deserializer 600 and the main controller 200 can be connected via an I2C (Inter-Integrated Circuit) bus for signal transmission. In a specific embodiment, the first video signal may be a FPD-Link (Flat Panel Display-Link) video signal, and the second video signal may be a LVDS (Low-Voltage Differential Signaling) video signal. The main controller 200 outputs a third control signal to the deserializer 600 to set the decoding parameters of the deserializer 600. The deserializer 600 decodes the FPD-Link video signal transmitted externally into an LVDS video signal based on the set decoding parameters.

[0078] Based on the same technical concept, an embodiment of the present invention also provides a power-on control method for a vehicle-mounted central control display screen. Figure 6 The flowchart of the power-on control method of the vehicle-mounted central control display screen according to an embodiment of the present invention is shown. The power-on control method is implemented based on the control device of the vehicle-mounted central control display screen according to any of the above embodiments or combinations of embodiments. Figure 6 As shown, the power-on control method may at least include the following steps S602 to S606.

[0079] Step S602: According to an external power-on signal, the first signal control terminal outputs a first enable signal of a high level.

[0080] In step S604, the OR gate circuit generates a high-level first control signal according to the high-level first enable signal, and outputs the high-level first control signal to the power converter to change the power converter from the off state to the working state to supply power to the main controller and the display screen.

[0081] Step S606 , the main controller responds to the power-on signal and switches from the off state to the on state to control the display screen, and outputs a high-level second enable signal to the OR gate circuit.

[0082] In one embodiment, when the vehicle-mounted central control display screen includes a level converter having the first signal control terminal and the second signal control terminal, step S602 can be further implemented as follows: according to the external input power-on signal, the level converter generates a high-level second control signal output to the main controller, and generates a high-level first enable signal output to the OR gate circuit.

[0083] Accordingly, in step S606 , the main controller receives the power voltage supplied by the power converter and switches from the off state to the on state in response to the high-level second control signal to control the display screen.

[0084] The power-on control method of the vehicle-mounted central control display provided by the embodiment of the present invention simplifies the power-on timing control operation of the vehicle-mounted central control display, and the method does not require a permanent power supply device, so that the static current of the entire vehicle-mounted central control display is low, reducing power loss.

[0085] Based on the same technical concept, an embodiment of the present invention also provides a power-off control method for a vehicle-mounted central control display screen. Figure 7 The flowchart of the power-off control method of the vehicle-mounted central control display screen according to an embodiment of the present invention is shown. The power-off control method is implemented based on the control device of the vehicle-mounted central control display screen according to any of the above embodiments or combinations of embodiments. Figure 7 As shown, the power-off control method may at least include the following steps S702 to S706.

[0086] Step S702: According to the shutdown signal input from the outside, the first signal control terminal outputs a first enable signal of a low level.

[0087] Step S704 , according to the shutdown signal input from the outside, the main controller powers off the display screen according to the preset power-off sequence, and then converts the second enable signal from a high level to a low level.

[0088] In step S706 , the OR gate circuit generates a low-level first control signal according to the low-level first enable signal and the low-level second enable signal, and outputs the low-level first control signal to the power converter to turn off the power converter.

[0089] In one embodiment, when the vehicle-mounted central control display screen includes a level converter having the first signal control terminal and the second signal control terminal, step S702 can be further implemented as follows: according to the external input shutdown signal, the level converter generates a low-level second control signal and outputs it to the main controller through the second signal control terminal, and generates a low-level first enable signal and outputs it to the OR gate circuit through the first signal control terminal.

[0090] Correspondingly, in step S704, according to the second control signal of the low level, the main controller powers off the display screen according to the preset power-off sequence, and then converts the second enable signal from the high level to the low level.

[0091] The power-off control method for the vehicle-mounted central control display provided by the embodiment of the present invention simplifies the power-off timing control operation of the vehicle-mounted central control display, and the method does not require a constant power supply device, so that the static current of the entire vehicle-mounted central control display is low, reducing power loss.

[0092] According to any one of the above optional embodiments or a combination of multiple optional embodiments, the embodiments of the present invention can achieve the following beneficial effects:

[0093] In the control device and method of the vehicle-mounted central control display screen provided by the present invention, the first control signal of different level states is generated by the OR gate circuit according to the second enable signal sent by the main controller and the first enable signal sent by the first signal control terminal, so that the power converter supplies or disconnects the power supply voltage to the main controller and the display screen through the first control signal of different level states, thereby realizing the power on and off control of the entire vehicle-mounted central control display screen. In addition, after the vehicle-mounted central control display screen is powered off, the main controller and the display screen are both disconnected from the power supply voltage (that is, no constant power supply is required), which can effectively prevent the increase of the leakage current of the vehicle-mounted central control display screen caused by environmental changes, thereby realizing low static current.

[0094] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0095] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A control device for a vehicle-mounted central control display screen, characterized in that: It includes a display screen, a main controller, a power converter connected to the display screen and the main controller respectively, and an OR gate circuit; wherein, The control device further comprises a level converter, wherein the level converter has a first signal control terminal and a second signal control terminal; The first signal control terminal is connected to the OR gate circuit, and is configured to generate first enable signals of different level states based on an external input power-on / power-off signal, and send the first enable signal to the OR gate circuit; The second signal control terminal is connected to the main controller and is configured to generate a second control signal with different level states according to an external input power on / off signal, and send the second control signal to the main controller; The main controller generates a second enable signal according to the second control signal; The OR gate circuit is connected to the main controller and the first signal control terminal respectively, and is configured to receive the second enable signal sent by the main controller and the first enable signal sent by the first signal control terminal to generate a first control signal with different level states; The power converter is connected to the OR gate circuit and is configured to receive the first control signal to enable the power converter to supply or disconnect the power voltage to the main controller and the display screen; The power converter is connected to the vehicle power supply; When a power-on signal is input, the level converter generates a second control signal of a seventh level state and a first enable signal of a third level state based on the externally input power-on signal; the OR gate circuit generates a first control signal of a fifth level state after receiving the first enable signal of a third level state sent by the level converter through the first signal control terminal; the power converter is in a working state in response to the first control signal of the fifth level state, so as to convert the voltage from the vehicle power supply into the power supply voltage required by the main controller and the display screen and then supply it to the main controller and the display screen, so that the main controller and the display screen are powered on; after receiving the second control signal of a seventh level state sent by the level converter through the second signal control terminal, the main controller starts in response to the second control signal of the seventh level state and the power supply voltage supplied by the power converter, and outputs a second enable signal of a first level state to the OR gate circuit in the starting state; the OR gate circuit still generates a first control signal of a fifth level state according to the second enable signal of the first level state and the first enable signal of the third level state sent by the first signal control terminal, so that the power converter is maintained in a working state; When a shutdown signal is input, the level converter generates a second control signal in an eighth level state and a first enable signal in a fourth level state based on the shutdown signal input externally; after receiving the second control signal in an eighth level state sent by the level converter through the second signal control terminal, the main controller performs a power-off operation on the display screen in response to the second control signal in the eighth level state; during the power-off of the display screen, the second enable signal output by the main controller remains unchanged at the first level state; the OR gate circuit generates a second control signal in an eighth level state based on the first enable signal in a fourth level state from the first signal control terminal of the level converter and the second enable signal in a first level state from the main controller. The first signal generates a first control signal of a fifth level state to be output to the power converter, so that the power converter remains in a working state; until the display screen is powered off, the main controller outputs a second enable signal of a second level state to the OR gate circuit, and the OR gate circuit generates a first control signal of a sixth level state based on the first enable signal of a fourth level state from the first signal control terminal of the level converter and the second enable signal of a second level state from the main controller to be output to the power converter, so that the power converter is in a closed state in response to the first control signal of the sixth level state to disconnect the power voltage output to the main controller and the display screen.

2. The control device according to claim 1, characterized in that: The first level state, the third level state, the fifth level state and the seventh level state are high levels, and the second level state, the fourth level state, the sixth level state and the eighth level state are low levels.

3. The control device according to claim 1, characterized in that: The level converter is connected to the vehicle power supply to obtain the vehicle power supply voltage; The level converter comprises: A transistor, wherein the base of the transistor is configured to receive the power on / off signal input from the outside; a first resistor, wherein two ends of the first resistor are respectively connected to the vehicle-mounted power supply and the collector of the transistor; and A second resistor, one end of the second resistor is connected to the emitter of the transistor to form an output connection point as the first signal control end and / or the second signal control end, and the other end of the second resistor is grounded.

4. The control device according to claim 1, characterized in that: The OR gate circuit comprises: a third resistor, one end of which is connected to the first signal control end to receive the first enable signal; a first diode, wherein an anode of the first diode is connected to the other end of the third resistor; a fourth resistor, one end of which is connected to the main controller to receive the second enable signal; and A second diode, wherein the anode and cathode of the second diode are respectively connected to the other end of the fourth resistor and the cathode of the first diode, wherein the connection point between the cathode of the second diode and the cathode of the first diode is connected to the power converter to output the first control signal.

5. The control device according to claim 1, characterized in that: Also includes: A deserializer, connected to the main controller, the power converter and the display screen respectively; The power converter is further configured to supply a power supply voltage to the deserializer to power on the deserializer; The deserializer is configured to decode the received first video signal into a second video signal based on a third control signal from the main controller after power-on, and output the second video signal to the display screen.

6. A method for controlling the power-on of a vehicle-mounted central control display screen, characterized in that: Based on the control device of the vehicle-mounted central control display screen according to any one of claims 1 to 5, the control method comprises: According to the external input power-on signal, the first signal control terminal outputs a first enable signal of a high level; The OR gate circuit generates a high-level first control signal according to the high-level first enable signal, and outputs the high-level first control signal to the power converter to change the power converter from a shutdown state to a working state to supply power to the main controller and the display screen; The main controller switches from a shutdown state to a startup state in response to the power-on signal to control the display screen, and outputs a high-level second enable signal to the OR gate circuit.

7. A method for controlling power-off of a vehicle-mounted central control display screen, characterized in that: Based on the control device of the vehicle-mounted central control display screen according to any one of claims 1 to 5, the control method comprises: According to the shutdown signal input from the outside, the first signal control terminal outputs a first enable signal of a low level; According to the shutdown signal input externally, the main controller performs a power-off operation on the display screen according to a preset power-off timing, and then converts the second enable signal from a high level to a low level; The OR gate circuit generates a low-level first control signal according to the low-level first enable signal and the low-level second enable signal, and outputs the low-level first control signal to the power converter to turn off the power converter.

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