CN220232432U - Control circuit for expansion screen - Google Patents

Abstract

The utility model discloses an extended screen control circuit which comprises a connector module, a power management module, a system management module and an extended screen module, wherein the connector module is respectively connected with the power management module and the system management module; the connector module is used for transmitting multimedia signals, the power management module is used for providing a stable low-voltage power supply, the system management module is used for connecting and processing a communication protocol, and the expansion screen module is used for receiving and transmitting information data. The utility model realizes line simplification and greatly improves the working efficiency of the expansion screen by the mutual matching of the connector module, the power management module, the system management module and the expansion screen module.

Description

Control circuit for expansion screen

Technical Field

The utility model relates to the technical field of expansion screens, in particular to an expansion screen control circuit.

Background

With the popularity of mobile devices and portable electronic devices, users' demands for larger screen displays and richer visual experiences are increasing, and in order to meet this demand, an extension screen is gradually introduced, which can connect the mobile device with an external display screen and realize control and management of the external display screen. The traditional extended screen control circuit is complex in circuit and has fewer functions, so that the working efficiency of an extended screen is greatly reduced, and the circuit maintenance time is prolonged.

Disclosure of Invention

The utility model aims to provide an extended screen control circuit, which aims to solve the problems of long maintenance time and single supported function of the traditional extended screen control circuit.

In order to solve the technical problems, the aim of the utility model is realized by the following technical scheme: the expansion screen control circuit comprises a connector module, a power management module, a system management module and an expansion screen module, wherein the connector module is respectively connected with the power management module and the system management module; the connector module is used for transmitting multimedia signals, the power management module is used for providing a stable low-voltage power supply, the system management module is used for connecting and processing a communication protocol, and the expansion screen module is used for receiving and transmitting information data;

further, the integrated circuit further comprises a first direct current converter, a second direct current converter, a third direct current converter and a first integrated circuit switch pin; the connector module is respectively connected with the first direct current converter, the second direct current converter and the third direct current converter through power lines, the first direct current converter is respectively connected with the first integrated circuit switch pin and the system management module through high-voltage power supply pins, and the second direct current converter and the third direct current converter are both connected with the power management module through low-voltage power supply pins; the first integrated circuit switch pin is connected with the power management module through a high-voltage power supply pin;

further, the power supply management integrated circuit also comprises a second integrated circuit switch pin, a third integrated circuit switch pin, a fourth integrated circuit switch pin, a fifth integrated circuit switch pin and an expansion screen power supply management integrated circuit; the second integrated circuit switch pin and the fifth integrated circuit switch pin are connected with the expansion screen module through high-voltage power supply pins, and the third integrated circuit switch pin and the fourth integrated circuit switch pin are connected with the expansion screen module through low-voltage power supply pins; the expansion screen power management integrated circuit is connected with the expansion screen module through a plurality of low-voltage power supply pins;

further, the connection mode between the connector module and the power management module is provided with a DP data channel, a DP auxiliary channel and a DP communication channel, wherein at least one DP data channel is arranged; the DP data channel is used for transmitting video data, the DP auxiliary channel is used for transmitting additional data, and the DP communication channel is used for transmitting protocol data and realizing a charging function;

furthermore, a plurality of MIPI interfaces are arranged in a connection mode between the expansion screen module and the power management module; the MIPI interface comprises a MIPI data line and a MIPI clock signal;

further, the system comprises a first level shifter and a second level shifter, wherein the first level shifter is respectively connected with the power management module and the system management module, and the second level shifter is respectively connected with the power management module and the system management module; the connection mode of the first level converter comprises an asynchronous serial communication interface, a reset pin, an SDA interface and an SCL interface, and the connection mode of the second level converter comprises an SPI interface;

furthermore, the connection mode between the expansion screen module and the system management module comprises an SPI interface, an interrupt pin, a reset pin, an SDA interface, an SCL interface and an ID pin;

further, the system management system comprises a KEY module, an RGB module and a BT module, wherein the KEY module is connected with the system management module through GPIO pins, the RGB module is connected with the system management module through a plurality of GPIO pins, and the BT module is connected with the system management module;

further, the system power management integrated circuit and the inertia measurement unit integrated circuit are connected with the system management module; the system power management integrated circuit and the inertial measurement unit integrated circuit are connected in a mode of comprising an SCL interface and an SDA interface;

further, the system further comprises a linear voltage stabilizer which is connected with the system power management integrated circuit and the inertia measurement unit integrated circuit through analog voltage pins respectively.

The utility model provides an extended screen control circuit which comprises a connector module, a power management module, a system management module and an extended screen module, wherein the connector module is respectively connected with the power management module and the system management module; the connector module is used for transmitting multimedia signals, the power management module is used for providing a stable low-voltage power supply, the system management module is used for connecting and processing a communication protocol, and the expansion screen module is used for receiving and transmitting information data. The utility model realizes line simplification and greatly improves the working efficiency of the expansion screen by the mutual matching of the connector module, the power management module, the system management module and the expansion screen module.

Drawings

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

FIG. 1 is a schematic block diagram I of an extended screen control circuit according to an embodiment of the present utility model;

FIG. 2 is a schematic block diagram II of an extended screen control circuit according to an embodiment of the present utility model;

FIG. 3 is a schematic block diagram III of an extended screen control circuit according to an embodiment of the present utility model;

FIG. 4 is a schematic block diagram of an extended screen control circuit according to an embodiment of the present utility model;

FIG. 5 is a schematic block diagram of an extended screen control circuit according to an embodiment of the present utility model;

FIG. 6 is a schematic block diagram of an extended screen control circuit according to an embodiment of the present utility model;

fig. 7 is a schematic block diagram seven of an extended screen control circuit according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

Referring to fig. 1, an embodiment of the present utility model provides an extended screen control circuit, which includes a connector module, a power management module, a system management module, and an extended screen module, where the connector module is connected with the power management module and the system management module, the extended screen module is connected with the power management module and the system management module, and the power management module is connected with the system management module; the connector module is used for transmitting multimedia signals, the power management module is used for providing a stable low-voltage power supply, the system management module is used for connecting and processing a communication protocol, and the expansion screen module is used for receiving and transmitting information data.

In this embodiment, the extended screen control circuit is a circuit for connecting a mobile device or a main device with an external display screen, and can transmit signals and data to the extended screen module through a connector module (such as a Type-C (DP), which represents a Type-C connector used in the circuit, wherein "DP" refers to a DisplayPort, the Type-C (DP) connector is a multifunctional connector, which can be used for transmitting video and audio signals), and through a power management module (such as a LT8668SX chip, which is a specific Type of power management chip, which is a high-efficiency buck synchronous DC-DC converter for providing a stable low-voltage power supply in the circuit) and a system management module (such as an NRF52833 chip, which is a multiprotocol wireless connection chip, belongs to an NRF52 series, which is a high-performance, low-power-consumption system-level chip, which is an integrated processor, a radio frequency transceiver, a memory, a mcf, a memory controller, and a memory controller, which can support multiple functions such as an mcf 52833, which can support multiple protocols such as an mcf 523, an mcf-GPIO, SPI, I, a communication interface, and a communication interface such as a communication interface, and a communication system can be provided with multiple functions such as a communication interface (such as a communication interface) of 3725, and a communication interface can be provided by using the system. The connector module is responsible for connecting the mobile device or the main device with the extended screen control circuit, and generally comprises various types of physical interfaces, such as HDMI, displayPort, USBType-C, etc., and through the connector module, the extended screen control circuit can receive multimedia signals, such as images, videos, audios, etc., from the main device and transmit the multimedia signals to the extended screen module for display and processing. The power management module plays a key role in the extended screen control circuit, and is responsible for providing a stable low-voltage power supply for the whole system, so that each module and each component can work normally. The power management module typically includes a power converter, voltage regulator, battery management circuitry, etc. for converting and stabilizing the input power and monitoring the status and load conditions of the power supply. In addition, the power management module can also support battery power supply to realize a portable extended screen control circuit. The system management module is responsible for connecting and processing a communication protocol, realizes communication and data transmission between the extended screen control circuit and the main equipment, generally comprises a processor, a memory, a communication interface and other components, and is used for receiving control commands and data from the main equipment, forwarding the control commands and data to the extended screen module for processing and displaying, and the system management module can also support image and video processing functions such as image decoding, video compression and the like. The expansion screen module is a core part of an expansion screen control circuit and is responsible for receiving information data from the system management module, converting the information data into images and video contents to be displayed on an external screen, and the expansion screen module generally comprises a display driving chip, a display screen and a related interface circuit and is used for controlling parameters such as brightness, color, resolution and the like of the display screen, and converting the image data into display signals to be output. The expansion screen module can be a liquid crystal display screen, an LED display screen, an OLED display screen and the like.

Furthermore, the extended screen control circuit not only can be used for an external display screen of the mobile device, but also can be applied to other fields; for example, in the field of industrial automation, extended screen control circuitry may be used to monitor and control data and parameters in a production process; in a medical device, the extended screen control circuit may be used to display patient monitoring data and medical images; in an in-vehicle entertainment system, the extended screen control circuit may be used for in-vehicle entertainment and navigation displays. With the continuous progress of technology, the extended screen control circuit can be combined with an Artificial Intelligence (AI) technology to realize a more intelligent function; for example, automatic brightness adjustment and user authentication may be implemented using face recognition techniques; voice control and intelligent assistant functions are implemented using voice recognition technology. In addition, the extended screen control circuit can also support the functions of multi-screen display and screen segmentation, so that a user can simultaneously display a plurality of application programs and contents, and the working efficiency and the user experience are improved.

Referring to fig. 2, in an embodiment, the integrated circuit further includes a first dc converter, a second dc converter, a third dc converter, and a first integrated circuit switch pin; the connector module is respectively connected with the first direct current converter, the second direct current converter and the third direct current converter through power lines, the first direct current converter is respectively connected with the first integrated circuit switch pin and the system management module through high-voltage power supply pins, and the second direct current converter and the third direct current converter are both connected with the power management module through low-voltage power supply pins; the first integrated circuit switch pin is connected with the power management module through a high-voltage power supply pin.

In this embodiment, the first dc converter is a power converter for implementing high voltage power supply, and converts the voltage of the input power source into the high voltage power required by the system management module and the switch pin of the first integrated circuit. High voltage power supplies are commonly used to drive control chips and high performance integrated circuits of display screens to ensure proper operation and to handle high speed data transmissions. The second dc converter and the third dc converter are power converters for realizing low-voltage power supply, and convert the voltage of the input power source into a stable low-voltage power source required by the power management module and the expansion screen module, and the second dc converter and the third dc converter are typically used for supplying the system management module, the expansion screen module and other low-power consumption electronic components. The first integrated circuit switch pin is connected to the switch pin of the first direct current converter, and is connected with the power management module through the high-voltage power supply pin and used for controlling the switch state of the first direct current converter, so that the supply and control of the high-voltage power supply are realized.

Specifically, the power line is typically VBUS, which refers to a power line that provides a 5 volt dc voltage for providing power to a connected device for normal operation. The VBUS line is typically powered by a USB host (e.g., computer, charger, etc.) and is transmitted to the connected USB device via a USB connection. On the USB device side, the VBUS line performs power management and power distribution through a circuit so as to meet the power requirements of the device. The first DC converter, the second DC converter, and the third DC converter may each employ DC-DC, which means a direct current-to-DC converter (directcurrentdirectcurrentconverter), which is an electronic device for converting the voltage of one DC power supply to the voltage of another DC power supply, typically by voltage boosting (boosting) or voltage dropping (voltage dropping). The low voltage supply pin is typically VCC and in many integrated circuits and electronic devices different functional modules and circuit parts may require different supply voltage levels. The high voltage supply pins are typically VDDH, which is distinguished from other power supplies (e.g., VDD, VDDA, etc.). The first IC switch pin is selected in this embodiment

Switch_sgm2578_3.3v, which refers to the Switch pin of the SGM2578 integrated circuit used in the circuit, is used to control the switching function in the circuit, and the operating voltage is 3.3 volts (V). SGM2578 is a special type of integrated circuit commonly used in power management and Switch control applications, where the switch_sgm2578_3.3v pin is used to receive control signals to control the state of switches in the circuit.

Referring to fig. 3, in an embodiment, the power management integrated circuit further includes a second integrated circuit switch pin, a third integrated circuit switch pin, a fourth integrated circuit switch pin, a fifth integrated circuit switch pin, and an extended screen power management integrated circuit; the second integrated circuit switch pin and the fifth integrated circuit switch pin are connected with the expansion screen module through high-voltage power supply pins, and the third integrated circuit switch pin and the fourth integrated circuit switch pin are connected with the expansion screen module through low-voltage power supply pins; the expansion screen power management integrated circuit is connected with the expansion screen module through a plurality of low-voltage power supply pins.

In this embodiment, the second integrated circuit switch pin (such as amoled_vci_3v3 refers to a voltage or a VCI (VoltageCommonInterface) pin of an AMOLED (Active-matrix organic light-EmittingDiode) display used in a circuit, the AMOLED is a display technology, uses an organic light emitting diode to emit light, has advantages of high contrast, fast response time, wide visual angle and the like, and is commonly used in mobile devices, televisions and other display applications. The third integrated circuit switch pin (e.g., amoled_vddd_1.1v, which refers to the VDDD pin or voltage of the AMOLED display used in the circuit, amoled_vddd_1.1v, which refers to the VDDD pin that supplies 1.1V voltage to the AMOLED display) and the fourth integrated circuit switch pin (e.g., amoled_vdd_1v8, which voltage level is determined according to characteristics and design requirements of the AMOLED) are typically used to achieve finer granularity control, such as screen brightness adjustment, color setting, etc., by controlling these pins, the display effect of the expansion screen module can be adjusted to meet different needs of the user. The extended screen power management integrated circuit is an independent integrated circuit and is specially used for managing power supply of an extended screen module, and the extended screen power management integrated circuit is used for managing power supply of the extended screen module through a plurality of low-voltage power supply pins (such as the low-voltage pins can be ELVDD, ELVSS and AVDD, the ELVDD generally refers to power supply pins of electronic elements in a circuit and is used for providing working voltage of the EL or the electroluminescent device, the ELVSS generally refers to power supply pins of the electronic elements in the circuit and is used for providing ground potential of the EL or the electroluminescent device, the electroluminescent device such as an electroluminescent diode or an electroluminescent film converts electric energy into light energy through electroluminescent effect, the ELVSS pin is a ground potential pin of the device and is generally used for providing a negative electrode or a low-potential power supply pin, the ELVSS pin generally needs to be connected with ground or ground potential of a power supply system to provide stable and proper ground potential, and is helpful for ensuring normal operation of the electroluminescent device and realizing the light-emitting effect, the AVDD generally refers to power supply pins of an analog circuit in the circuit and is used for providing power supply voltage required by the analog circuit. The expansion screen power management integrated circuit can also support power management functions, such as a low power consumption mode, overcurrent protection and the like, so as to improve the power efficiency and the safety.

Further, the extended screen control circuit may support multi-channel display, allowing multiple external display screens to be connected simultaneously, enabling a wider range of display or multitasking. The expansion screen control circuit can integrate the touch screen controller, and convert an external display screen into a touch screen, so that more visual interaction experience is realized. The extended screen control circuit may include a backlight control circuit for adjusting backlight brightness and power saving management of the display screen. The extended screen control circuit can support different types of connection modes, such as wired connection, wireless connection or hybrid connection, so as to adapt to the requirements of different devices and application scenes. The extended screen control circuit can integrate artificial intelligence technology to realize intelligent display functions such as image recognition, scene optimization and the like.

In an embodiment, the connection mode between the connector module and the power management module is a DP data channel, a DP auxiliary channel and a DP communication channel, and at least one DP data channel is provided; the DP data channel is used for transmitting video data, the DP auxiliary channel is used for transmitting additional data, and the DP communication channel is used for transmitting protocol data and realizing a charging function.

In this embodiment, the DP data channel (in the circuit, the DP data channel is usually connected with other data channels to form a complete DisplayPort data channel) is used for transmitting video data, which is the most critical channel in the extended screen control circuit, and is responsible for transmitting video signals generated by a main device (such as a mobile device or a computer) to a connected extended screen module, so that high-resolution images and video contents can be transmitted through the DP data channel, thereby realizing high-quality visual experience. The DP auxiliary channel (e.g. AUX) is used for transmitting additional data, and besides video data, the extended screen control circuit may need to transmit other additional information, such as audio data, touch screen data, device status information, etc., and the DP auxiliary channel may implement the transmission of these additional data, so as to support richer functions and interaction experience. DP communication channels (e.g., CCs) are used to transmit protocol data and implement charging functions. In the extended screen control circuit, communication and protocol exchange between devices may need to be performed to ensure that connected devices can work properly cooperatively, and the DP communication channel can transmit these protocol data to realize interaction and communication between devices. In addition, the DP communication channel may also be used to implement a charging function, allowing the host device to provide power charging to the connected expansion screen module.

Further, in addition to the DP interface, the modern extended screen control circuit may also support other types of connection modes and interfaces to meet different application requirements. For example: HDMI (HighDefinitionMultimedia Interface) the HDMI interface is another commonly used digital video and audio interface, which can support high-resolution video transmission and multi-channel audio transmission, and is widely applied to televisions, displays, projectors and other devices. The USBType-C interface is a universal connection interface and supports functions such as high-speed data transmission, video output, power supply charging and the like. It can be used to connect mobile devices with external display screens and support multi-function extensions. With the development of wireless communication technology, the extended screen control circuit can also support wireless connection modes, such as Wi-Fi, miracast and the like, so as to realize wireless video transmission and data exchange. The device can also be Thunderbolt, and the Thunderbolt interface is a high-speed data transmission interface, can support 4K video transmission, data transmission and power supply charging, and is suitable for a high-performance extended screen control circuit.

In an embodiment, a plurality of MIPI interfaces are provided in a connection manner between the expansion screen module and the power management module; wherein, MIPI interface includes MIPI data line and MIPI clock signal.

In this embodiment, MIPI data lines are used to transmit video data, audio data, and other additional data, which support high-speed data transmission, enabling the transmission of high-resolution video and multi-channel audio, as well as the interaction of other additional data. The expansion screen module can receive video signals and data from the power management module through the MIPI data line so as to realize content display and functional interaction. The MIPI clock signal is used for synchronizing data transmission and timing control. In the data transmission process, the clock signal can provide time sequence information of data transmission, so that accurate transmission and synchronization of data are ensured, the stability and accuracy of the MIPI clock signal are very important for video display and data interaction, and the MIPI clock signal is usually provided by a power management module and is connected with an expansion screen module through an MIPI interface.

Further, the MIPI interface is a very flexible and high performance interface standard that can support other functions and features in addition to data lines and clock signals. For example: besides data and clock signals, the MIPI interface can also support transmission of control signals for controlling the functions of expanding the working state, brightness adjustment, color setting and the like of the screen module. These control signals may be provided by a power management module or a system management module. The MIPI interface may support power management functions, such as low power modes, standby modes, etc., to achieve power savings and to extend battery life. Besides video transmission, the MIPI interface can also support high-quality audio transmission, and support multi-channel audio playing and transmission. The MIPI interface may support the transmission of multiple channels, allowing for the connection of multiple external displays or other peripherals.

Referring to fig. 4, in an embodiment, the system further includes a first level shifter and a second level shifter, where the first level shifter is connected to the power management module and the system management module respectively, and the second level shifter is connected to the power management module and the system management module respectively; the connection mode of the first level converter comprises an asynchronous serial communication interface, a reset pin, an SDA interface and an SCL interface, and the connection mode of the second level converter comprises an SPI interface.

In this embodiment, the first level shifter connection manner includes an asynchronous serial communication interface, a reset pin, an SDA interface, and an SCL interface. An asynchronous serial communication interface (such as UART interface, UART is an asynchronous serial communication interface, which is commonly used for short-distance communication between devices, and can implement simple bidirectional data transmission, and is suitable for connecting a microcontroller, a sensor, a peripheral, etc.) is used for a communication protocol for connecting a power management module and a system management module, which allows data transmission between devices in an asynchronous manner. The reset pin is typically used to reset the level shifter when needed, ensuring that it is in the correct state. The SDA interface and the SCL interface are used to connect to an I2C (Inter-integrated circuit) bus, which is a common serial communication protocol, and support communication between multiple devices. The connection mode of the second level shifter comprises an SPI interface. SPI (SerialPeripheralInterface) is an interface standard for serial communications that supports full duplex communications and the connection of multiple slave devices. Through SPI interface, power management module and system management module can carry out high-speed data transmission and control interaction.

In an embodiment, the connection mode between the expansion screen module and the system management module includes an SPI interface, an interrupt pin, a reset pin, an SDA interface, an SCL interface, and an ID pin.

In this embodiment, the SPI interface allows full duplex communication while supporting the connection of multiple slave devices. The interrupt pin is used to implement an asynchronous notification mechanism. The expansion screen module can inform the main controller of the occurrence of specific events, such as data preparation, touch screen operation and the like, by sending signals to the interrupt pins of the system management module, so that the system management module can respond to the events in time and perform corresponding processing. The reset pin is used for resetting the expansion screen module, and the expansion screen module can be restored to the initial state by controlling the reset pin, so that the expansion screen module is ensured to be in a correct state when being started. The reset pin is typically controlled by the system management module to enable initialization and management of the expansion screen module. The SDA interface and the SCL interface are typically used to connect to an I2C (Inter-integrated circuit) bus, which is a serial communication protocol that supports communication between multiple devices, and through the SDA interface and the SCL interface, the expansion screen module and the system management module may perform simple bidirectional data transmission and configuration. The ID pin is used for identifying the identity or the type of the expansion screen module, and the system management module can detect the existence of the expansion screen module and distinguish different types of expansion screens through the ID pin, so that the system management module can carry out corresponding configuration and adaptation according to different expansion screen types.

Specifically, the expansion screen module may further include LCM and TP, where LCM generally refers to a liquid crystal module (liquid crystal module), and TP generally refers to a touch screen; a liquid crystal module is a common display device for displaying images and information in electronic products. A touch screen is an input device for receiving a touch operation of a user and converting it into an electrical signal, and for the touch screen to function properly, it is necessary to supply an appropriate power supply voltage thereto.

Referring to fig. 5, in an embodiment, the system management device further includes a KEY module, an RGB module, and a BT module, where the KEY module is connected to the system management module through GPIO pins, the RGB module is connected to the system management module through multiple GPIO pins, and the BT module is connected to the system management module.

In this embodiment, the KEY module is configured to receive KEY input of a user, and transmit a KEY event to the system management module through the GPIO pin, where the system management module may detect a KEY pressing and releasing event and make a corresponding response according to an operation of the user, and the KEY module may implement different types of KEYs, such as a common KEY, a touch KEY, and so on, so as to meet different input requirements of the user. The RGB module is used for controlling the color and the brightness of the LED backlight, is connected with the system management module through a plurality of GPIO pins (such as GPIO_RED, GPIO_BLUE, GPIO_GREEN and the like) and allows the system management module to adjust the brightness and the color of the LED according to the needs, so that different display effects and visual experiences are realized, and the RGB module is generally applied to a liquid crystal display screen, an AMOLED display screen and the like and is used for adjusting the brightness and the color of the display screen. The BT module is a Bluetooth communication module which is connected with the system management module to realize a Bluetooth communication function, and the system management module can perform data transmission and communication with other Bluetooth equipment through Bluetooth communication, such as data interaction with a smart phone, a tablet personal computer and the like to realize functions of data transmission, remote control, data synchronization and the like.

Further, the extended screen control circuit can also comprise other functional modules to meet more application requirements. For example: and the camera module is used for shooting photos and videos and transmitting data through the system management module. The sensor module can be used for detecting environmental parameters such as temperature, humidity, illumination intensity and the like and transmitting data to the system management module. And the NFC module is used for short-distance data transmission and communication and supporting functions of mobile payment, data exchange and the like.

Referring to fig. 6, in one embodiment, the system power management integrated circuit and the inertial measurement unit integrated circuit are further included, and the system power management integrated circuit and the inertial measurement unit integrated circuit are both connected with the system management module; the connection modes of the system power management integrated circuit and the inertial measurement unit integrated circuit comprise an SCL interface and an SDA interface.

In this embodiment, a system power management integrated circuit (such as UCS11610, a high-integration system level power management integrated circuit) is responsible for managing power supply and power consumption control of the entire system, providing stable low-voltage power to each module in the system, and implementing power consumption management functions, such as power switching, standby mode, sleep mode, and the like, and the system power management integrated circuit communicates with and controls the system management module through the SCL interface and the SDA interface, so as to allow the system management module to configure and control the power management integrated circuit. The inertial measurement unit integrated circuit (such as icm_42607, an inertial measurement unit integrated circuit, icm_42607 is a highly integrated six-axis inertial measurement unit, and simultaneously integrates a three-axis accelerometer and a three-axis gyroscope, which can be used to measure acceleration and angular velocity of an object and provide accurate attitude and motion data) is a sensor, which is commonly used to measure attitude and motion states of equipment, and generally includes sensors such as an accelerometer, a gyroscope and a magnetometer, for detecting parameters such as acceleration, angular velocity and magnetic field strength of the equipment, and communicates with a system management module through an SCL interface and an SDA interface, and transmits the measured data to the system management module for analysis and processing of the attitude and motion states by the system management module.

Additionally, the extended screen control circuit may also include other integrated circuits and sensors to enable more functions and applications, such as: and the temperature and humidity sensor is used for measuring the ambient temperature and humidity so as to realize environmental monitoring and automatic adjustment. And the light sensor is used for measuring illumination intensity and realizing automatic adjustment of backlight brightness and screen brightness. And the audio coder-decoder is used for encoding and decoding audio data and realizing high-quality audio playing and recording. The power management chip can be added with other special power management chips besides the system power management integrated circuit for finer-grained power control and management. And the network communication module is used for realizing wireless communication, such as a Wi-Fi module, a Bluetooth module, a LoRa module and the like, and supporting network connection and remote data transmission. The camera sensor is used for shooting and transmitting high-quality images and videos, and achieving functions of high-definition video call, image acquisition and the like.

In an embodiment, as shown in fig. 7, the system power management integrated circuit and the inertial measurement unit integrated circuit are connected with each other through analog voltage pins.

In the present embodiment, a linear voltage regulator is an electronic component for stabilizing voltage output, which converts an unstable input voltage into a stabilized output voltage; in an extended screen control circuit, a linear voltage regulator is commonly used to provide a stable low voltage power supply to a system power management integrated circuit and an inertial measurement unit integrated circuit. The system power management integrated circuit is responsible for power supply and power consumption control of the whole system, a stable low-voltage power supply is needed to drive each module and each sensor, and the linear voltage stabilizer converts unstable input voltage into the required stable low-voltage power supply through an analog voltage pin so as to ensure that the system power management integrated circuit can normally operate and stably supply power. Inertial measurement unit integrated circuits typically require a stable low voltage power supply to operate to ensure that the sensor accurately measures attitude and motion. The linear voltage stabilizer provides a stable low-voltage power supply through an analog voltage pin, so that an inertial measurement unit integrated circuit can work normally and provide accurate data.

While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. The expansion screen control circuit is characterized by comprising a connector module, a power management module, a system management module and an expansion screen module, wherein the connector module is respectively connected with the power management module and the system management module; the connector module is used for transmitting multimedia signals, the power management module is used for providing a stable low-voltage power supply, the system management module is used for connecting and processing a communication protocol, and the expansion screen module is used for receiving and transmitting information data.

2. The extended screen control circuit of claim 1, further comprising a first dc converter, a second dc converter, a third dc converter, and a first integrated circuit switch pin; the connector module is respectively connected with the first direct current converter, the second direct current converter and the third direct current converter through power lines, the first direct current converter is respectively connected with the first integrated circuit switch pin and the system management module through high-voltage power supply pins, and the second direct current converter and the third direct current converter are both connected with the power management module through low-voltage power supply pins; the first integrated circuit switch pin is connected with the power management module through a high-voltage power supply pin.

3. The extended screen control circuit of claim 1, further comprising a second integrated circuit switch pin, a third integrated circuit switch pin, a fourth integrated circuit switch pin, a fifth integrated circuit switch pin, and an extended screen power management integrated circuit; the second integrated circuit switch pin and the fifth integrated circuit switch pin are connected with the expansion screen module through high-voltage power supply pins, and the third integrated circuit switch pin and the fourth integrated circuit switch pin are connected with the expansion screen module through low-voltage power supply pins; the expansion screen power management integrated circuit is connected with the expansion screen module through a plurality of low-voltage power supply pins.

4. The expansion screen control circuit of claim 1, wherein the connection between the connector module and the power management module comprises a DP data channel, a DP auxiliary channel and a DP communication channel, wherein at least one DP data channel is provided; the DP data channel is used for transmitting video data, the DP auxiliary channel is used for transmitting additional data, and the DP communication channel is used for transmitting protocol data and realizing a charging function.

5. The extended screen control circuit of claim 1, wherein a plurality of MIPI interfaces are provided for connection between the extended screen module and the power management module; wherein, MIPI interface includes MIPI data line and MIPI clock signal.

6. The extended screen control circuit of claim 1, further comprising a first level shifter and a second level shifter, the first level shifter being coupled to the power management module and the system management module, respectively, the second level shifter being coupled to the power management module and the system management module, respectively; the connection mode of the first level converter comprises an asynchronous serial communication interface, a reset pin, an SDA interface and an SCL interface, and the connection mode of the second level converter comprises an SPI interface.

7. The expansion screen control circuit of claim 1, wherein the connection between the expansion screen module and the system management module comprises an SPI interface, an interrupt pin, a reset pin, an SDA interface, an SCL interface, and an ID pin.

8. The extended screen control circuit of claim 1, further comprising a KEY module connected to the system management module through GPIO pins, an RGB module connected to the system management module through multiple GPIO pins, and a BT module connected to the system management module.

9. The extended screen control circuit of claim 1, further comprising a system power management integrated circuit and an inertial measurement unit integrated circuit, both connected to the system management module; the connection modes of the system power management integrated circuit and the inertial measurement unit integrated circuit comprise an SCL interface and an SDA interface.

10. The extended screen control circuit of claim 9, further comprising a linear regulator connected to the system power management integrated circuit and the inertial measurement unit integrated circuit via analog voltage pins, respectively.