CN114694326A

CN114694326A - Extended display equipment of face payment equipment and face payment system

Info

Publication number: CN114694326A
Application number: CN202011596863.1A
Authority: CN
Inventors: 吕俊; 刘文君; 郭润增
Original assignee: Tencent Technology Shenzhen Co Ltd
Current assignee: Tencent Technology Shenzhen Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2022-07-01
Anticipated expiration: 2040-12-29
Also published as: CN114694326B

Abstract

The application discloses face payment equipment's extension display device and face payment system relates to computer technical field, especially relates to intelligent payment equipment field for through the transmission of extension connection interface compatible operation data and video data simultaneously, realize human-computer interaction when satisfying the extension display function of face payment. In the extended display equipment, a video signal conversion module is connected with a video signal end of an extended connection interface, the video signal conversion module receives a video signal through the video signal end of the extended connection interface, converts the video signal into a display signal which can be displayed by a display module and outputs the display signal to the display module for displaying; the operation module is connected with the processor module, the processor module is connected with the operation data signal end of the expansion connection interface, operation data for operating the expansion display device is obtained based on the triggering of the operation event, and the operation data signal end is used for sending the operation data to the face payment device.

Description

Extended display equipment of face payment equipment and face payment system

Technical Field

The application relates to the technical field of computers, in particular to the field of intelligent payment equipment, and provides an extended display device of a face payment device and a face payment system.

Background

An Artificial Intelligence (AI) device is a new intelligent machine that can react in a manner similar to human Intelligence, and has many applications in many fields, for example, in current electronic payment systems, face recognition payment has become a common payment method. The identity of a payment user needs to be identified by combining an AI (artificial intelligence) identification technology on the basis of face recognition equipment, so that the payment process is realized.

Generally, current face payment equipment is usually a single screen, and when cash is paid, the single screen is usually presented to a payment user, and a cashier cannot check the face payment condition and perform operations, so that part of current merchants extend through an external display device of a High Definition Multimedia Interface (HDMI) Interface, but the extension of the method can only realize a basic display function, does not support the cashier to perform any operation, cannot meet more use requirements, and is not ideal in use experience.

Disclosure of Invention

The embodiment of the application provides an extended display device of a face payment device and a face payment system, and is used for being compatible with transmission of operation data and video data through an extended connection interface, achieving man-machine interaction while meeting the extended display function of face payment, and improving the use experience of the extended display device.

On one hand, the extended display equipment of the face payment equipment is provided, and comprises a display module, a processor module, a video signal conversion module, an extended connection interface and an operation module, wherein the extended connection interface is connected with the face payment equipment;

the display module is connected with the video signal conversion module, the video signal conversion module is connected with a video signal end of the extended connection interface, and the video signal conversion module receives a video signal sent by the face payment equipment through the video signal end of the extended connection interface, converts the video signal into a display signal which can be displayed by the display module and outputs the display signal to the display module for displaying;

the operation module is connected with the processor module, the processor module is connected with an operation data signal end of the expansion connection interface, and based on an operation event detected by the operation module, the processor module is triggered to acquire operation data for operating the expansion display device and send the operation data to the face payment device through the operation data signal end.

In one aspect, a face payment system is provided, which includes a face payment device and the extended display device of the above aspect;

the extended display equipment comprises an extended connection interface, and the extended display equipment is connected with the face payment equipment through the extended connection interface.

In the embodiment of the application, the extended display device comprises a display module, a processor module, a video signal conversion module, an extended connection interface and an operation module, and the extended display device is connected with the face payment device through the extended connection interface. The video signal conversion module receives video signals through the video signal end of the extended connection interface, converts the video signals into display signals which can be displayed by the display module and outputs the display signals to the display module for displaying; on the other hand, the operation module is connected with the processor module, the processor module is connected with the operation data signal end of the interface, the processor module is triggered to acquire operation data for operating the extended display device based on the operation event detected by the operation module, and the operation data is sent to the face payment device through the operation data signal end. Therefore, the scheme of this application embodiment, through the transmission of extension connection interface compatible operation data and video data simultaneously, realize man-machine interaction when satisfying the extension display function of people's face payment, and then promote the use experience of extension display device, and, also avoided in the correlation technique after through the external display device of HDMI interface, if need other operating function, need additionally connect a Universal Serial Bus (USB) like touch operation function, practice thrift the wire rod, reduce equipment cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or related technologies, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, it is obvious that the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic view of a scenario provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of an extended display device provided in an embodiment of the present application;

fig. 3 is another schematic structural diagram of an extended display device provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of a standard USB Type C interface according to an embodiment of the present application;

fig. 5 is a schematic diagram of a custom USB Type C interface provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a USB Type C interface provided in an embodiment of the present application;

fig. 7 is a schematic diagram of a switching circuit corresponding to switching of an HDMI5V signal or an HPD signal path according to an embodiment of the present disclosure;

fig. 8 is a schematic diagram of a switching circuit for switching an SDA signal or an SCL signal path according to an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a switching circuit corresponding to TMDS signal path switching according to an embodiment of the present disclosure;

fig. 10 is a schematic connection diagram of a differential signal exchanger in a pass-through state according to an embodiment of the present application;

fig. 11 is a schematic connection diagram of a differential signal switch in a cross-conduction state according to an embodiment of the present application;

fig. 12 is a schematic flow chart of video signal transmission and conversion provided by an embodiment of the present application;

fig. 13 is a schematic flow chart of TP data reporting provided in the embodiment of the present application;

fig. 14 is a flowchart illustrating a backlight brightness control process according to an embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. In the present application, the embodiments and features of the embodiments may be arbitrarily combined with each other without conflict.

For the convenience of understanding the technical solutions provided by the embodiments of the present application, some key terms used in the embodiments of the present application are explained first:

USB: the universal serial bus is an external bus standard for standardizing the connection and communication between computer equipment and external equipment, and is an interface technology applied in the field of Personal Computers (PCs). The USB device is divided into a HOST (HOST) device and a SLAVE (SLAVE) device, and data transmission can be realized only when one HOST device is connected with one SLAVE device.

USB Type C: a USB interface technology includes special definition of communication protocol and physical interface.

Human Interface Device (HID) protocol: the HID device is a device directly interacting with human, such as a keyboard, a mouse, a joystick and the like, the HID device does not need to be a human-computer interface, and the HID device is only a device conforming to the HID specification, and the HID keyboard protocol is one of the HID protocols.

Serial port communication: the serial port sends and receives bytes in bits (bit). The serial port communication hardware has two signals of Transmitting (TX) and receiving (receiving, RX), and one line can be used for transmitting data while the other line is used for receiving data.

Artificial Intelligence (AI) is a theory, method, technique and application system that uses a digital computer or a machine controlled by a digital computer to simulate, extend and expand human Intelligence, perceive the environment, acquire knowledge and use the knowledge to obtain the best results. In other words, artificial intelligence is a comprehensive technique of computer science that attempts to understand the essence of intelligence and produce a new intelligent machine that can react in a manner similar to human intelligence. Artificial intelligence is the research of the design principle and the realization method of various intelligent machines, so that the machines have the functions of perception, reasoning and decision making.

The artificial intelligence technology is a comprehensive subject and relates to the field of extensive technology, namely the technology of a hardware level and the technology of a software level. The artificial intelligence infrastructure generally includes technologies such as sensors, dedicated artificial intelligence chips, cloud computing, distributed storage, big data processing technologies, operation/interaction systems, mechatronics, and the like. The artificial intelligence software technology mainly comprises a computer vision technology, a voice processing technology, a natural language processing technology, machine learning/deep learning and the like.

Computer Vision technology (CV) Computer Vision is a science for researching how to make a machine "see", and further refers to that a camera and a Computer are used to replace human eyes to perform machine Vision such as identification, tracking and measurement on a target, and further image processing is performed, so that the Computer processing becomes an image more suitable for human eyes to observe or transmitted to an instrument to detect. As a scientific discipline, computer vision research-related theories and techniques attempt to build artificial intelligence systems that can capture information from images or multidimensional data. Computer vision technologies generally include image processing, image recognition, image semantic understanding, image retrieval, OCR, video processing, video semantic understanding, video content/behavior recognition, three-dimensional object reconstruction, 3D technologies, virtual reality, augmented reality, synchronous positioning, map construction, and other technologies, and also include common biometric technologies such as face recognition and fingerprint recognition.

As artificial intelligence technology is researched and developed, the artificial intelligence technology is researched and applied in a plurality of fields, for example, in the current electronic payment system, human face recognition payment is a common payment method. The identity of a payment user needs to be recognized by combining an AI recognition technology on the basis of face brushing equipment, so that the payment process is realized.

The current face payment device is usually a single screen, and when cash is paid, the single screen is usually presented to a User, and a cashier cannot check the face payment condition and perform operation, so that part of current merchants are extended by externally connecting a display device through a High Definition Multimedia Interface (HDMI) Interface, but the extension of the method can only realize a basic display function, and does not support the cashier to perform any operation, for example, the method cannot support a touch function, and cannot meet more use requirements, and the extension display does not perform User Interface (UI) adaptation, so that the use experience is not ideal.

In addition, current people's face payment equipment is either single-screen or double-screen collocation, and the model is fixed before dispatching from the factory, and the configuration of single-screen and double-screen can't be changed in a flexible way according to actual scene demand in later stage, and too much increase equipment model can increase production and after-sale degree of difficulty and cost.

In addition, although the standard Type C interface includes a port of a display part, a System On Chip (SOC) platform supporting the full-function Type C is limited, and the low-and-medium-end SOC platform does not support the full-function Type C generally, and a protocol and a control circuit of the full-function Type C need to be added on an extended screen at the same time.

In view of this, an embodiment of the present application provides an extended display device, where the extended display device includes a display module, a processor module, a video signal conversion module, an extended connection interface, and an operation module, and the extended display device is connected to a face payment device through the extended connection interface. The video signal conversion module receives video signals through the video signal end of the extended connection interface, converts the video signals into display signals which can be displayed by the display module and outputs the display signals to the display module for displaying; on the other hand, the operation module is connected with the processor module, the processor module is connected with the operation data signal end of the interface, the processor module is triggered to acquire operation data for operating the extended display device based on the operation event detected by the operation module, and the operation data is sent to the face payment device through the operation data signal end.

Therefore, the scheme of this application embodiment, through the transmission of extension connection interface compatible operation data and video data simultaneously, realize man-machine interaction when satisfying the extension display function of people's face payment, and then promote the use experience of extension display device, and, also avoided in the correlation technique after through the external display device of HDMI interface, if need other operating function, need additionally connect a Universal Serial Bus (USB) like touch operation function, practice thrift the wire rod, reduce equipment cost.

In the embodiment of the application, the extension display equipment is connected with the face payment equipment through the extension connecting interface, and then can be flexibly switched between single-screen and double-screen equipment according to actual requirements, for example, a merchant can buy the single-screen equipment firstly, and the extension display equipment is bought according to requirements at the later stage.

In this application embodiment, self-defining through carrying out Type C physical interface, multiplexing HDMI, USB, power and other control signal through a connection interface to consider because Type C physical interface is positive and negative symmetrical structure, set up positive and negative discernment and switching circuit, and then realize single Type C line transmission video signal, touch signal and control signal's ability. Multiplexing signal physical interface and corresponding high-speed signal line, full function type C wire rod on the market can directly multiplex to the product, need not extra customization wire rod, further practices thrift the cost.

After introducing the design concept of the embodiment of the present application, some simple descriptions are provided below for application scenarios to which the technical solution of the embodiment of the present application can be applied, and it should be noted that the application scenarios described below are only used for describing the embodiment of the present application and are not limited. In a specific implementation process, the technical scheme provided by the embodiment of the application can be flexibly applied according to actual needs.

The scheme provided by the embodiment of the application can be suitable for most scenes needing face payment, and is particularly suitable for face payment scenes of manual cash register. As shown in fig. 1, a scene schematic diagram provided for the embodiment of the present application includes a face payment device 10 and an extended display device 20.

The face payment device 10 may be any face payment device, the face payment device 10 includes an extension connection interface, the extension display device 20 also includes the same extension connection interface, and then may be connected through a wire adapted to the extension connection interface.

Wherein the face payment device 10 is used as a master device, and the extended display device 20 is used as a slave device, and when in operation, the face payment device 10 mainly controls the display of the extended display device 20 and responds to the operation performed on the extended display device 20.

In a specific implementation process, the face payment device 10 may send the content displayed by itself to the extended display device 20 through the extended connection interface, so that the extended display device 20 displays the content synchronously, and certainly, the content displayed by the extended display device 20 and the content displayed by the face payment device 10 may not be identical, and the face payment device 10 may control the content that needs to be displayed by the extended display device 20.

In a specific implementation process, the extended display device 20 may include a plurality of HID devices or an external HID device, and the cashier may operate through the HID devices, and then the extended display device 20 may obtain operation data through the HID interface, and send the operation data to the face payment device 10 through the extended connection interface after processing the operation data through the HID protocol.

For example, the HID device may be a matrix keyboard, and then after the cashier operates the keyboard, the cashier may send a key value to the extended display device 20 through an interface between the keyboard and the extended display device 20, and the extended display device 20 performs protocol conversion on the key value and reports the key value to the face payment device 10, and correspondingly, the face payment device 10 may also determine a display video stream corresponding to the extended display device 20 according to the operation of the cashier, and further control the extended display device 20 to update the screen display content.

Of course, the method provided in the embodiment of the present application is not limited to be used in the application scenario shown in fig. 1, and may also be used in other possible application scenarios, and the embodiment of the present application is not limited.

The technical scheme of the embodiment of the application mainly relates to a hardware technology in the AI technology, namely a face payment device for realizing a face payment process and an expansion display device thereof.

Referring to fig. 2, a schematic structural diagram of an extended display device 20 provided in the embodiment of the present application is shown, where the extended display device includes a display module 201, a processor module 202, a video signal conversion module 203, an extended connection interface 204, and an operation module, and the extended display device 20 is connected to the face payment device 10 through the extended connection interface 204;

the display module 201 is connected to the video signal conversion module 203, the video signal conversion module 203 is connected to the video signal end of the extended connection interface 204, and the video signal conversion module 203 receives a video signal through the video signal end of the extended connection interface 204, converts the video signal into a display signal displayable by the display module, and outputs the display signal to the display module 201 for display.

Generally speaking, the video signal output by the face payment device 10 to the extended display device 20 is an HDMI signal, and the HDMI signal cannot be directly displayed by the display panel, so the video signal conversion module 203 is provided in this embodiment, so that after the extended display device 20 acquires the video signal through the extended connection Interface 204, the format of the video signal in the HDMI format may be converted through the video signal conversion module 203 to obtain a display signal that can be displayed by the display module 201, for example, the display signal may be converted into a Mobile Industry Processor Interface (MIPI) signal.

As shown in fig. 2, the extended display device 20 receives the HDMI signal from the face payment device 10 through the extended connection interface 204, and the video signal conversion module 203 converts the HDMI signal into an MIPI signal and outputs the MIPI signal to the display module for display.

In a specific application, the video signal conversion module 203 may adopt any conversion module capable of converting an HDMI signal into an MIPI signal, for example, MIPI Bridge, which is a chip that converts an HDMI input signal into an output signal of a MIPI Display Serial Interface (DSi), for example, a chip with a model number LT 6911C. Of course, other possible conversion modules may also be adopted, and the embodiment of the present application does not limit this.

In the extended Display device 20 provided in the embodiment of the application, the Display module 201 may be a Display panel, such as a Liquid Crystal Display (LCD), an Organic Light Emitting Display (OLED), or other possible displays, which is not limited in the embodiment of the application.

In the extended display device 20 provided in the embodiment of the application, the processor module 202 is a device having a certain processing capability, such as a Central Processing Unit (CPU), a Micro Controller Unit (MCU), or a single chip microcomputer or a Programmable Logic Controller (PLC), and can be selected according to a requirement in actual application.

In a possible embodiment, the cost of the processor module 202 is considered, and the MCU with a lower cost may be selected, so as to reduce the manufacturing cost of the entire extended display device 20 while satisfying the performance of the processor. For example, an MCU chip with a model CH554 may be used.

In the extended display device 20 provided in the embodiment of the present application, the operation module included in the extended display device 20 is connected to the processor module 202, the processor module 202 is connected to the operation data signal terminal of the extended connection interface 204, and based on the operation event detected by the operation module, the processor module 202 is triggered to acquire the operation data for operating the extended display device 20, and the operation data is sent to the face payment device 10 through the operation data signal terminal.

Specifically, the operation module may include various HID devices, for example, a matrix keyboard 2051 or an external mouse, and the display module of the extended display device 20 may further include a Touch module 2052, that is, the display module may be a Touch Panel (TP), and each HID device is connected to the processor module 202 through an HID interface.

After the processor module 202 obtains the operation data, the operation data may be processed according to a set data transmission protocol, and then the processed operation data is sent to the face payment device 10.

In one possible embodiment, the operation data signal terminal may be, for example, a USB port.

Illustratively, if the operation module includes a matrix keyboard 2051 and a touch module 2052, the processor module 202 may simulate three device nodes, that is, an HID keyboard, an HID touchpad, and an HID controller, which are respectively connected to the face payment device to implement data communication, and each device node corresponds to keyboard data, TP data, and control data, respectively, where the control data mainly includes protocol processing data of the keyboard data and the TP data, and the control data is reported to the face payment device 10 after the HID controller performs protocol conversion on the keyboard data and the TP data according to a corresponding data protocol.

In the extended display device 20 provided in the embodiment of the present application, the extended connection interface 204 may include a key value signal terminal used for transmitting keyboard data, for example, the USB port described above, the extended display device 20 may further include a matrix keyboard connection interface, and the processor module 202 is connected to the matrix keyboard 2051 through the matrix keyboard connection interface. The processor module 202 obtains the key values of the operated keys in the matrix keyboard 2051 through the matrix keyboard connection interface, processes the key values according to the set keyboard data transmission protocol, and sends the key values to the face payment device 10 through the key value signal terminal.

As shown in fig. 2, the matrix keyboard connection interface may be implemented by a General-purpose input/output (GPIO) interface, the GPIO interface includes a plurality of status terminals, and the processor module determines the key values of the operated keys according to the statuses of the status terminals and the corresponding relationships between the statuses of the status terminals and the key values.

In practical application, the state of the matrix keyboard 2051 is transmitted to the processor module 202 through each GPIO, and the processor module 202 converts the GPIO state into data conforming to the matrix keyboard data format and reports the data to the face payment device 10.

In a possible implementation manner, the matrix keyboard is a 22-key matrix keyboard, and further may be connected to the processor module 202 through 10 GPIOs, where 10 GPIOs form a key matrix supporting 24 keys at most through a matrix combination of 4X6, when a certain key is pressed, a level state of the corresponding GPIO may be changed, and then the processor module 202 reads the state of the GPIO, and through a pre-stored key state list, the processor module 202 may map to the corresponding key to know the key pressed by the cashier, and convert the mapped key into a key value conforming to the HID keyboard protocol, and then the processor module 202 uploads the key value to the face payment device 10 through a key value signal terminal.

In the extended display device 20 provided in the embodiment of the application, the extended connection interface 204 may include a touch signal terminal for transmitting TP data, for example, the USB port described above, and the touch module 2052 may be connected to the processor module 202 through an Integrated Circuit bus (I2C) for transmitting TP data. TP data detected by the touch module 2052 is transmitted to the processor module 202 via the I2C, converted into data conforming to the HID TP data format, and reported to the face payment device 10 via the USB port.

As shown in fig. 3, another structural schematic diagram of the extended display device 20 is shown, wherein the extended display device 20 may further include a backlight driving module 206, and the backlight driving module 206 is respectively connected to the processor module 202 and the display module 201.

In specific application, when a user wants to adjust the backlight brightness of the display module 201, the backlight brightness may be controlled by the face payment device 10, and certainly, the backlight brightness of the display module 201 may also be adjusted by operating an adjusting button on the extended display device 20, and in any way, the processor module 202 may receive the backlight adjusting signal, further generate a backlight driving signal corresponding to the backlight value indicated by the backlight adjusting signal, and output the backlight driving signal to the backlight driving module 206, and the backlight driving module 206 converts the backlight driving signal into a corresponding current signal or voltage signal, and outputs the current signal or voltage signal to the display module 201, so as to adjust the backlight brightness of the display module.

In a possible implementation manner, the processor module 202 may convert the backlight value into a PWM signal corresponding to a duty ratio, where different backlight values correspond to different duty ratios, and further may output the PWM signal to the backlight driving module 206, and the backlight driving module 206 converts the PWM signal into a current-voltage signal, thereby implementing control of different backlight brightness of the display module 201.

In the extended display device 20 provided in the embodiment of the present application, the extended display device 20 may further include a storage module 207, and the storage module 207 is respectively connected to each operation module and the processor module 202.

For example, the memory module 207 may be coupled to the touch module 2052, when the touch module 2052 detects a touch event, the touch module 2052 stores touch data to the memory module 207 and sends an interrupt signal to the processor module 202, and the processor module 202 reads the touch data from the memory module 207 based on the interrupt signal. The storage module 207 may divide a part of the storage space for the touch module 2052, and is used for storing the touch data.

In the extended display device 20 provided in the embodiment of the present application, the processor module 202 is further connected to the video signal conversion module 203, and is configured to implement power-on initialization state monitoring and firmware upgrade of the video signal conversion module 203.

Specifically, the processor module 202 acquires the firmware program of the video signal conversion module 203 from the face payment device 10 through the expansion connection interface 204 and stores the firmware program in the storage module 207, and the processor module 202 updates the firmware program into the video signal conversion module 203 through a connection channel with the video signal conversion module 203, such as an I2C or other hardware interface, so as to initialize the video signal conversion module 203.

The processor module 202 may also monitor the operating status of the video signal conversion module 203 in real time, and when an abnormality occurs in the video signal conversion module 203, the processor module 202 may reset and reinitialize the video signal conversion module 203. For example, when the video signal conversion module 203 has an abnormality, such as a video signal interruption or other fault, the video signal conversion module 203 may send an interrupt signal to the processor module 202 through the GPIO, and after the processor module 202 receives the interrupt signal, knowing that the video signal conversion module 203 has the abnormality, the video signal conversion module 203 may be reset and initialized again.

In the extended display device 20 provided by the embodiment of the application, the extended display device further includes a power module 209, the power module 209 is connected to a power supply port in the extended connection interface, so that power can be taken from the face payment device 10 through the power supply port, and the voltage provided by the face payment device 10 is converted into the power supply voltage required by each module on the extended display device 20, so as to supply power to these modules. For example, the power supply voltage output by the face payment device 10 may be 5V, and the power supply module 209 may convert the 5V voltage into power supplies with different voltages and time sequences required by the respective modules.

In the extended display device 20 provided in the embodiment of the application, the extended connection interface 204 may be an interface with a front-back symmetric structure, and based on the above description, it can be known that the extended connection interface 204 includes a video signal end, a touch signal end, a key value signal end, and a power signal end, where the video signal may be an HDMI signal, the touch signal may be transmitted through an I2C interface, the key value signal may be transmitted through a USB interface, and the power signal is a VBUS signal, so as shown in fig. 4, the extended connection interface 204 needs to be compatible with transmission of the HDMI signal, an I2C signal, a USB signal, and a power signal.

The expansion connection interface 204 may be, for example, a USB Type C interface. In practical applications, of course, other possible symmetrical interfaces may also be adopted, and the embodiment of the present application does not limit this. The USB Type C interface will be described as an example.

As shown in fig. 4, the USB Type C interface is a schematic diagram of a standard USB Type C interface, and the USB Type C interface includes 24 pins, wherein the order of the pin definitions after the a-plane and the B-plane are still the same, 12 pins of the a-plane are GND, TX1+, TX1-, VBUS, CC1, D +, D-, SBU1, VBUS, RX2-, RX2+, and GND in sequence, and 12 pins of the B-plane are GND, TX1+, TX1-, VBUS, CC1, D +, D-, SBU1, VBUS, RX2-, RX2+, and GND in sequence.

The standard USB Type C interface has corresponding pins to VBUS and USB, that is, the pins a4, a9, B4, and B9 are VBUS signal pins, and the pins a6, a7, B6, and B7 are USB signal pins, so that the existing pin definitions can be multiplexed.

On the one hand, because the full function of the standard USB Type C interface is not all required in the extended display device 20, and the full function of the USB Type C interface needs to be adapted to the corresponding processor, the cost is high, on the other hand, the HDMI signal and the I2C signal cannot support transmission, and for the aggregation transmission of signals such as HDMI, USB, I2C, and power, the use of wires between the face payment device 10 and the extended display device is reduced, which redefines the USB Type C interface in the embodiment of the present application.

Because the standard HDMI includes 4 sets of signals such as a Time Minimized Differential Signal (TMDS), an I2C serial Signal, a power Signal, and a Hot Plug Detect (HPD) Signal, correspondingly, in the embodiment of the present application, a USB Type C interface is customized for the transmission of the HDMI, as shown in fig. 5 and 6, fig. 5 is a customized schematic diagram of the USB Type C interface in the embodiment of the present application, and fig. 6 is a structural schematic diagram of the USB Type C interface, the interface is simultaneously applied to the face payment device 10 and the extended display device 20, that is, both the face payment device 10 and the extended display device 20 may include such a customized USB Type C interface, and are connected through a connector adapted to the USB Type C interface.

Specifically, the user-defined USB Type C interface includes the following:

(1) the first pin pair, including a first pin a2 and a second pin A3, is used for transmitting one of a differential clock signal and a first differential data signal. Since the USB Type C interface has a front-back structure, the first pin a2 and the second pin A3 can be used to transmit different signals when the connector is inserted in different directions.

For example, in the case of positive insertion as shown in FIG. 5, the first pin A2 and the second pin A3 are used for transmitting differential Clock signals, and the differential Clock signals of HDMI include TMDS Clock + (CK +) and TMDS Clock- (CK-), which are transmitted through the first pin A2 and the second pin A3, respectively.

Conversely, when the connector is reverse-plugged, the first pin A2 and the second pin A3 are used to transmit a first differential Data signal, including TMDS Data1+ (DA1+) and TMDS Data1- (DA 1-).

(2) The second pin pair, located on the opposite side of the first pin pair, includes a third pin B2 and a fourth pin B3 for transmitting the other of the differential clock signal or the first differential data signal.

In contrast to the first pin A2 and the second pin A3, when the first pin A2 and the second pin A3 transmit TMDS Clock + and TMDS Clock-, the third pin B2 and the fourth pin B3 transmit TMDS Data1+ and TMDS Data 1-; alternatively, when the first pin A2 and the second pin A3 transmit TMDS Data1+ and TMDS Data1-, then the third pin B2 and the fourth pin B3 transmit TMDS Clock + and TMDS Clock-.

(3) The third pin pair, including a fifth pin a11 and a sixth pin a10, is used for transmitting one of the second differential data signal and the third differential data signal.

When the connector is plugged positively, the fifth pin A11 and the sixth pin A10 are used for transmitting a second differential Data signal, and the second differential Data signal of the HDMI comprises TMDS Data2+ (DA2+) and TMDS Data2- (DA2-), which are transmitted by the fifth pin A11 and the sixth pin A10 respectively.

Conversely, when the connector is unplugged, then the fifth pin A11 and the sixth pin A10 are used to transmit a third differential Data signal, which includes TMDS Data0+ (DA0+) and TMDS Data0- (DA 0-).

(4) The fourth pin pair on the opposite side of the third pin pair includes a seventh pin B11 and an eighth pin B10 for transmitting the other of the second differential data signal and the third differential data signal.

In contrast to the fifth pin A11 and the sixth pin A10, when the fifth pin A11 and the sixth pin A10 transmit TMDS Data2+ and TMDS Data2-, then the seventh pin B11 and the eighth pin B10 transmit TMDS Data0+ and TMDS Data 0-; alternatively, when the fifth pin A11 and the sixth pin A10 transmit TMDS Data0+ and TMDS Data0-, then the seventh pin B11 and the eighth pin B10 transmit TMDS Data2+ and TMDS Data 2-.

(5) And a ninth pin a5 for transmitting one of a power-on signal HDMI5V or a hot plug detection signal of HDMI.

For example, the ninth pin a5 is used to transmit an HDMI5V signal when the connector is plugged in forward, and the ninth pin a5 is used to transmit an HPD signal when the connector is plugged in reverse.

(6) A tenth pin B5 located opposite to the ninth pin a5 for transmitting the other of the HDMI5V signal or the HPD signal.

In contrast to the ninth pin a5, the tenth pin B5 transmits an HPD signal when the ninth pin a5 transmits an HDMI5V signal, or the tenth pin B5 transmits an HDMI5V signal when the ninth pin a5 transmits an HPD signal.

(7) An eleventh pin A8 for transmitting one of a Serial Data (SDA) signal I2C or a Serial Clock (SCL) signal I2C.

For example, the eleventh pin A8 is used to transmit the I2C SDA signal when the connector is plugged forward, and the eleventh pin A8 is used to transmit the I2C SCL signal when the connector is plugged backward.

(8) And a twelfth pin B8, located opposite the eleventh pin A8, for transmitting the other of the I2C SDA signal or the I2C SCL signal.

In contrast to the eleventh pin A8, the twelfth pin B8 transmits an I2C SCL signal when the eleventh pin A8 transmits an I2C SDA signal, or the twelfth pin B8 transmits an I2C SDA signal when the eleventh pin A8 transmits an I2C SCL signal.

It should be noted that the above-mentioned manner of customizing the pins is only one possible defining manner, and during actual use, the pins can be defined according to their own requirements, which is not limited in the embodiment of the present application.

In this application embodiment, because carry out the self-defining to USB Type C interface, and the USB Type C interface after the self-defining when positive and negative inserts the same port transmission different signal, consequently need just insert and distinguish to the contrary, in order to make each signal can be accurate transmit, need just insert to the contrary and discern and switch.

Referring to fig. 4, the extended display device 20 according to the embodiment of the present application may further include a forward/reverse switching (switch) module 208, where the video signal conversion module 203 is connected to the video signal end of the extended connection interface 204 through the forward/reverse switching module 208, and the forward/reverse switching module 208 switches a connection channel between the video signal end and the video signal conversion module 203 according to a direction of a connector inserted into the extended connection interface 204, so that the video signal transmitted by the video signal end can be transmitted to a corresponding receiving port in the video signal conversion module 203 when the connector is inserted forward or reversely.

In one possible embodiment, the insertion direction of the connection can be determined by means of software discrimination. Specifically, one of the pins of the expansion connection interface 204 may be used as a positive and negative insertion detection end, the positive and negative insertion detection end is connected to the processor module 202, and then the processor module 202 may determine the insertion direction of the connector according to the level value of the positive and negative insertion detection end, and control the positive and negative insertion switching module 208 to switch to the connection channel corresponding to the insertion direction.

For example, the processor module 202 may determine that the insertion direction of the connector is one of forward insertion or backward insertion when the forward/backward insertion detection terminal is at a high level, and the processor module 202 may determine that the insertion direction of the connector is the other of forward insertion or backward insertion when the forward/backward insertion detection terminal is at a low level.

Specifically, the positive and negative insertion detection terminal may be, for example, a pin for transmitting a power-on signal, such as the ninth pin a5 or the tenth pin B5, and of course, other pins may also be selected as the positive and negative insertion detection terminal, which is not limited in this embodiment of the application.

In another possible implementation, the connection channel between the video signal terminal and the video signal conversion module 203 may be switched in a hardware control manner.

The following describes switching between different signal paths.

(1) HDMI5V signal or HPD signal path switching

As shown in fig. 7, it is a schematic diagram of a switching circuit for switching the HDMI5V signal or HPD signal path included in the forward/reverse plug switching module 208. The forward/reverse insertion switching module 208 includes a first switch U1 and a second switch U2, and further includes a first selection terminal CC1_ SEL, a second selection terminal CC2_ SEL, an HDMI5V signal terminal and an HPD signal terminal; the first switch U1 and the second switch U2 each include an input terminal COM, a logic control terminal IN, a normally closed output terminal NC, and a normally open output terminal NO.

The first switch U1 and the second switch U2 may be single-pole double-throw switches or other electronic devices capable of implementing the same function of the single-pole double-throw switches. Taking a single-pole double-throw switch as an example, the single-pole double-throw switch may be a single-pole double-throw switch of SGM3157, for example. When the input of the logic control end IN of the single-pole double-throw switch is high level, the input end COM is conducted with the normally open output end NO, and when the input of the logic control end IN is low voltage, namely IN a default state, the input end COM is conducted with the normally closed output end NC.

As shown in fig. 7, the input COM of the first switch U1 is connected to the CC1, and as shown in fig. 6, the CC1 is a resistor R connected in series to the ninth pin a5 of the expansion connection interface 204_c1IN the latter output, the normally closed output end NC of the first switch U1 is connected with the HDMI5V signal end and the first selection end CC1_ SEL, the normally open output end NO of the first switch U1 is connected with the HPD signal end, and the second selection end CC2_ SEL is connected with the logic control end IN of the first switch U1.

The input end COM of the second switch U2 is connected to the CC2, as shown in fig. 6, the CC2 is a resistor R connected in series to the tenth pin B5 of the expansion connection interface 204_c2The normally closed output end NC of the second switch U2 is connected with the HDMI5V signal end and the second selection end CC2_ SEL, the normally open output end NO of the second switch U2 is connected with the HPD signal end, and the first selection end CC1_ SEL is connected with the second switchThe logic control terminal IN of U2 is turned off.

Specifically, referring to fig. 7, the normally closed output NC of the first switch U1 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the HDMI5V signal terminal, the normally closed output NC of the first switch U1 is connected to the first selection terminal CC1_ SEL after being connected to the resistor R11, and the resistor R11 is connected to the first selection terminal CC1_ SEL and is connected to the reference voltage terminal through the resistor R12. The resistance of R12 is much larger than that of R11, for example, R12 is 10 kilo-ohms (K Ω) and R11 is 1K Ω.

The first selection terminal CC1_ SEL is further connected to a gate of a metal oxide semiconductor field effect (MOS) transistor Q4, a source of the MOS transistor Q4 is connected to a reference voltage terminal, a drain of the MOS transistor Q4 is connected to the gate of the MOS transistor Q3 and the resistor R23, a source of the MOS transistor Q3 is connected to the resistor R24, the resistor R23 and the resistor R24 are further connected to the VBUS terminal, and a drain of the MOS transistor Q3 is connected to the logic control terminal IN of the second switch U2. The Q4 may be an N-type MOS transistor, the Q3 may be a P-type MOS transistor, and a level value of the first selection terminal CC1_ SEL is consistent with a level value of the SEL2, that is, the SEL2 is also at a high level when the first selection terminal CC1_ SEL is at a high level, or the SEL2 is also at a low level when the first selection terminal CC1_ SEL is at a low level.

The normally closed output end NC of the second switch U2 is connected with the anode of the diode D2, the cathode of the diode D1 is connected with the HDMI5V signal end, the normally closed output end NC of the second switch U2 is connected with the resistor R21 and then connected with the second selection end CC2_ SEL, and one end of the resistor R21 connected with the first selection end CC2_ SEL is connected with the reference voltage end through the resistor R22. The resistance of R22 is much larger than that of R21, for example, R22 is 10 kilo-ohms (K Ω) and R21 is 0 Ω.

The second selection terminal CC2_ SEL is further connected to the gate of the MOS transistor Q2, the source of the MOS transistor Q2 is connected to the reference voltage terminal, the drain of the MOS transistor Q2 is connected to the gate of the MOS transistor Q1 and the resistor R13, the source of the MOS transistor Q1 is connected to the resistor R14, the resistor R13 and the resistor R14 are further connected to the VBUS terminal, and the drain of the MOS transistor Q1 is connected to the logic control terminal IN of the first switch U1. The Q2 may be an N-type MOS transistor, the Q1 may be a P-type MOS transistor, and a level value of the second selection terminal CC2_ SEL is consistent with a level value of the SEL1, that is, the SEL1 is also at a high level when the second selection terminal CC2_ SEL is at a high level, or the SEL1 is also at a low level when the second selection terminal CC2_ SEL is at a low level.

The first switch U1 and the second switch U2 further include a power supply terminal V and a reference terminal G, the power supply terminals V of the first switch U1 and the second switch U2 are both connected to the VBUS pin of the expansion connection interface, and the reference terminal G is connected to a reference voltage terminal.

As shown in table 1 below, a state table of each key point in forward/reverse interpolation switching is shown.

When the insertion direction of the connector is positive insertion, the input end COM of the first switch U1 is connected to the normally closed output end NC, the ninth pin a5 outputs the HDMI5V signal to the first selection end CC1_ SEL, then SEL2 is high level, then the logic control end IN of the second switch U2 is high level, the input end COM of the second switch U2 is connected to the second normally open output end NO, then CC2 is communicated with the HPD signal end, since the CC2 is connected to the tenth pin B5 of the expansion connection interface 204, and the HPD signal end and the HDMI5V signal end of the positive and negative insertion switching module 208 are respectively connected to the HPD signal end and the HDMI5V signal end of the video signal conversion module 203, that is, when positive insertion is performed, the tenth pin B5 of the expansion connection interface 204 is communicated to the HPD signal end of the video signal conversion module 203, and the ninth pin a5 is communicated to the HDMI5V signal end of the video signal conversion module 203.

	Positive insertion	Reverse plug
			CC1	HDMI	5V	HPD
CC1_SEL	High level of voltage	Low level of electricity
			SEL1	High level	Low level of electricity
U1	COM connecting NC	COM with NO
			CC2	HPD	HDMI	5V
CC2_SEL	Low level of electricity	High level
			SEL2	Low level of electricity	High level
U2	COM with NO	COM connecting NC

TABLE 1

When the insertion direction of the connector is reverse insertion, the input end COM of the second switch U2 is connected to the normally closed output end NC, the tenth pin B5 outputs the HDMI5V signal to the second selection end CC2_ SEL, and SEL1 is high level, so the logic control end IN of the first switch U1 is high level, the input end COM of the first switch U1 is connected to the first normally open output end NO, so the CC1 is communicated with the HPD signal end, because the CC1 is connected to the ninth pin a5 of the extended connection interface 204, that is, when reverse insertion is performed, the ninth pin a5 of the extended connection interface 204 is communicated with the HPD signal end of the video signal conversion module 203, and the tenth pin B5 is communicated with the HDMI5V signal end of the video signal conversion module 203.

In this embodiment, the first selector CC1_ SEL or the second selector CC2_ SEL may be connected to the processor module 202, so that the processor module 202 may set the first selector CC1_ SEL or the second selector CC2_ SEL to a high level or a low level through a software determination manner, thereby implementing the forward and reverse insertion switching.

(2) SDA signal or SCL signal path switching

As shown in fig. 8, a schematic diagram of a switching circuit for switching the SDA signal or SCL signal path included in the forward/reverse insertion switching module 208 is shown. The forward/reverse insertion switching module 208 may further include a third switch U3 and a fourth switch U4, and further includes a serial data signal terminal and a serial control signal terminal; the third switch U3 and the fourth switch U4 each include an input terminal COM, a logic control terminal IN, a normally closed output terminal NC, and a normally open output terminal NO.

An eleventh pin A8 of the expansion connection interface 204 is connected to a normally closed output terminal NC of the third switch U3 and a normally open output terminal NO of the fourth switch U4, respectively, a twelfth pin B8 is connected to a normally open output terminal NO of the third switch U3 and a normally closed output terminal NC of the fourth switch U4, respectively, a logic control terminal IN of the third switch U3 and a logic control terminal IN of the fourth switch U4 are both connected to the second selection terminal CC2_ SEL, an input terminal COM of the third switch U3 is connected to the serial control signal terminal, and an input terminal COM of the fourth switch U4 is connected to the serial data signal terminal.

IN a specific application, the second selection terminal CC2_ SEL may be connected to a gate of a MOS transistor, a source of the MOS transistor is connected to a reference voltage terminal, a drain of the MOS transistor is connected to the logic control terminal IN of the third switch U3 and the logic control terminal IN of the fourth switch U4, the logic control terminal IN of the third switch U3 and the logic control terminal IN of the fourth switch U4 are further connected to the VBUS terminal through a resistor R31, and when the second selection terminal CC2_ SEL is at a high level, the logic control terminal IN of the third switch U3 and the logic control terminal IN of the fourth switch U4 are also at a high level.

When the insertion direction of the connector is positive insertion, the second selection terminal CC2_ SEL is at low level, the input terminals COM of the third switch U3 and the fourth switch U4 are connected to the normally open output terminal NO, the eleventh pin A8 is connected to the serial data signal terminal, the twelfth pin B8 is connected to the serial control signal terminal, because the serial data signal terminal of the positive and negative insertion switching module 208 is connected to the serial data signal terminal of the video signal conversion module 203, and because the serial control signal terminal of the positive and negative insertion switching module 208 is connected to the serial control signal terminal of the video signal conversion module 203, the eleventh pin A8 of the expansion connection interface 204 is connected to the serial data signal terminal of the video signal conversion module 203, and the twelfth pin B8 is connected to the serial control signal terminal of the video signal conversion module 203.

When the insertion direction of the connector is reverse insertion, the second selection terminal CC2_ SEL is at high level, the input terminals COM of the third switch U3 and the fourth switch U4 are connected to the normally closed output terminal NC, the eleventh pin A8 is communicated with the serial control signal terminal, the twelfth pin B8 is communicated with the serial data signal terminal, the eleventh pin A8 of the expansion connection interface 204 is communicated with the serial control signal terminal of the video signal conversion module 203, and the twelfth pin B8 is communicated with the serial data signal terminal of the video signal conversion module 203.

Through the above switching, the SDA signal or the SCL signal can be transmitted to the corresponding port of the video signal conversion module 203 regardless of the forward or reverse insertion.

(3) TMDS signal path switching

As shown in fig. 9, it is a schematic diagram of a switching circuit corresponding to the switching of the TMDS signal path in the forward/reverse insertion switching module 208. The switching module 208 further includes a differential signal switch U5, and the differential signal switch U5 includes a logic control terminal POL, 4 pairs of differential signal input terminals, and 4 pairs of differential signal output terminals.

Specifically, as shown in fig. 9, 4 pairs of differential signal input terminals are CRX1+ and CRX1-, CTX1+ and CTX1-, CTX2+ and CTX2-, and CRX2+ and CRX2-, and 4 pairs of differential signal output terminals are LND + and LND-, LNC + and LNC-, LNB + and LNB-, and LNA + and LNA-.

The logic control end POL of the differential signal switch U5 is connected to the second selection end CC2_ SEL, and the 4 pairs of differential signal input ends are respectively connected to the first pin pair, the second pin pair, the third pin pair and the fourth pin pair. Specifically, the first pin a2 is connected with CTX2+, the second pin A3 is connected with CTX2-, the third pin B2 is connected with CTX1+, the fourth pin B3 is connected with CTX1-, the fifth pin a11 is connected with CRX1+, the sixth pin a10 is connected with CRX1-, the seventh pin B11 is connected with CRX2+, and the eighth pin B10 is connected with CRX 2-.

In practical applications, the differential signal switch U5 may be any electronic device capable of implementing differential pair cross switching, for example, a differential pair cross switching chip with model number HD3SS460I, which is specifically shown in fig. 9 by way of example.

As shown in table 2, the state of the differential signal switch U5 is shown in the table.

	CC2_SEL	POL	AMSEL	EN	U5
						Positive insertion	Low level of electricity	Low level of electricity	High level of voltage	High level	Straight-through
Reverse plug	High level	High level	High level	High level	Cross conduction

TABLE 2

When the connector is inserted in the positive direction, the second selection terminal CC2_ SEL is at the low level, and therefore the logic control terminal POL of the differential signal switch U5 is also at the low level, and therefore the differential signal switch U5 is in the through state, and 4 pairs of differential signal input terminals and 4 pairs of differential signal output terminals are correspondingly connected. As shown in fig. 10, which is a schematic connection diagram of the differential signal switch U5 in the pass-through state, when the differential signal switch U5 is in the pass-through state, the CRX1 port pair is connected to the LND port pair, the CTX1 port pair is connected to the LNC port pair, the CTX2 port pair is connected to the LNB port pair, and the CRX2 port pair is connected to the LNA port pair.

When the connector is inserted in the reverse direction, the second selection terminal CC2_ SEL is at the high level, the differential signal switch U5 is in the cross conducting state, and 4 pairs of differential signal input terminals and 4 pairs of differential signal output terminals are cross connected. As shown in fig. 11, it is a schematic connection diagram of the differential signal switch U5 in the cross conduction state, and when the differential signal switch U5 is in the cross conduction state, the pair of CRX1 ports is connected to the pair of LNA ports, the pair of CTX1 ports is connected to the pair of LNB ports, the pair of CTX2 ports is connected to the pair of LNC ports, and the pair of CRX2 ports is connected to the pair of LND ports.

Taking the CRX1 port pair and the CRX2 port pair as examples, the CRX1 port pair is connected to the third pin pair of the expansion connection interface 204, and the CRX2 port pair is connected to the fourth pin pair of the expansion connection interface 204. During the forward insertion, the third pin pair transmits the HDMI data signal DA2, the fourth pin pair transmits the HDMI data signal DA0, since the differential signal switch U5 is controlled to be in the through state, the DA2 signal of the CRX1 port pair is output through the LND port pair, and the DA0 signal of the CRX2 port pair is output through the LNA port pair, while during the backward insertion, the third pin pair transmits the DA0 signal, and the fourth pin pair transmits the DA2 signal, since the differential signal switch U5 is controlled to be in the cross conduction state, the DA0 signal of the CRX1 port pair is output through the LNA port pair, and the DA2 signal of the CRX2 port pair is output through the LND port pair, therefore, whether the backward insertion or the forward insertion is performed, the DA2 signal is always output by the LND port pair of the differential signal switch U5, the LNA port pair always outputs the DA0 signal, and the differential pair signal output to the video signal conversion module 203 is always correct.

In the embodiment of the present application, when the expansion connection interface 204 outputs the differential pair signal to the differential signal converter U5, in order to improve circuit safety, components related to circuit safety protection, such as the transient voltage suppressors D51 and D52 shown in fig. 9, may also be added, and each differential signal pair passes through the transient voltage suppressors D51 and D52 and is then output to the differential signal converter U5. The transient voltage suppressors D51 and D52 are further connected to the differential signal switch U5 through capacitors, i.e., C1 to C8 shown in fig. 9, and capacitors may be provided on each path of the differential signals.

In the embodiment of the application, the second selection terminal CC2_ SEL is connected to the POL terminal of the differential signal switch U5 through a MOS transistor Q8, wherein the second selection terminal CC2_ SEL is connected to the drain of the MOS transistor Q8, the source of the MOS transistor Q8 is connected to the POL terminal, and the gate of the MOS transistor Q8 is connected to the 3.3V power supply.

The workflow of the extended display device 20 will be described in conjunction with the above device description. The following workflow specifically takes the extended display device 20 shown in fig. 3 as an example.

(1) Type C data line insertion

When the user needs to expand the display to face payment equipment 10, can be connected face payment equipment 10 and extension display device 20 through Type C wire rod. Wherein, the Type C wire rod specifically is the data line that the both ends are the USBType C interface, is connected people's face payment equipment 10 and extension display device 20 as the connector with the data line that these both ends are the USBType C interface.

When the face payment device 10 is connected to the extended display device 20, the forward/reverse insertion switching module 208 determines the insertion direction of the Type C data line according to the port into which the HDMI5V signal is transmitted, and then the forward/reverse insertion switching module 208 switches the corresponding signal to the correct path, and the specific determination and switching process may refer to the description of the HDMI5V signal or HPD signal path switching, which is not described herein in detail.

(2) Video signal transmission and conversion

Fig. 12 is a schematic flow chart of video signal transmission and conversion.

Step 101: the processor module 202 receives the firmware program issued by the face payment device 10 through the USB port of the expansion connection interface 204, and stores the firmware program in the storage module.

Step 102: the processor module 202 updates the firmware program to the video signal conversion module 203 through the I2C interface to initialize the video signal conversion module 203.

Step 103: the HDMI5V signal is input to the video signal conversion module 203 through the extended connection interface 204.

Step 104: after receiving the HDMI5V signal, the video signal conversion module 203 outputs an HPD signal to the expansion connection interface 204 if the working state of the video signal conversion module is normal, so as to send the HPD signal to the face payment device 10.

Step 105: after receiving the HPD signal, the face payment device 10 reads Extended Display Identification Data (EDID) information stored in the video signal conversion module 203 through I2C.

After the above handshake process is completed, the face payment device 10 can know the edid information of the extended display device 20, such as resolution, frame rate, and bit depth.

Step 106: the face payment device 10 outputs the HDMI video signal matched with the edid information to the video signal conversion module 203.

Step 107: the video signal conversion module 203 converts the HDMI video signal into an MIPI video signal, and outputs the MIPI video signal to the display module 201.

Step 108: when the video signal conversion module 203 encounters an exception such as a video stream interrupt, the processor module 202 is notified of the exception status by I2C or an interrupt signal.

Step 109: the processor module 202, upon receiving the exception interrupt, resets the video signal conversion module 203 via the reset signal and re-initializes it.

(3) TP data reporting

Fig. 13 is a schematic flow chart of TP data reporting.

Step 201: the touch module 2052 detects an operation event.

Use display module 201 as the capacitive screen for example, touch module 2052 detects whether there is the operation body to contact the capacitive screen through continuously charging and discharging the capacitive screen, when the operation body contacts, for example when human finger contacts, because human skin is the conductor, can change the capacitance value of contact to change the charge-discharge state of contact, thereby touch module 2052 then can detect the operational incident.

Step 202: the touch module 2052 signals the processor module 202, via an interrupt signal, the generation of a touch event, while the touch module 2052 stores the coordinates of the touch point in the memory module 207.

Specifically, the touch module 2052 may convert the charge/discharge state into a touch time, and notify the processor module 202 of the generation of the touch event through an interrupt signal.

In practical application, a part of registers for storing touch data is reserved in the storage module 207 for dedicated storage of the touch data.

Of course, in actual use, the touch module 2052 may also send touch data to the processor module 202 directly through I2C.

Step 203: after the processor module 202 receives the interrupt signal of the touch module 2052, the processor module 202 can read the storage module corresponding to the TP chip touch module 2052 through the I2C, so as to read the coordinate data of the touch point

Step 204: the processor module 202 performs format conversion and packaging processing on the coordinate data, and reports the TP contact coordinate data to the face payment device 10 according to the HID protocol specification by frames.

In this way, the face payment device 10 may read the TP coordinate data through the USB port, and then map the TP coordinate data into the UI of the touch screen according to the coordinate data, so as to determine the content corresponding to the touch position.

(4) Key value data reporting process:

taking a key matrix with at most 24 keys formed by 10 GPIOs and 4X6 as an example, when a key is pressed, the level state of the corresponding GPIO is changed by triggering, and the processor module 202 can read the state of each GPIO, map to the corresponding key through a pre-stored key state list, convert the mapped key into a key conforming to the HID protocol, and upload the key to the human face payment device 10 through the USB interface.

(5) Backlight brightness control flow:

fig. 14 is a flow chart illustrating a backlight brightness control process.

Step 301: the face payment device 10 sends the brightness data to the processor module 202 through the USB port according to the HID controller protocol.

The user may set the backlight brightness of the extended display device 20 on the face payment device 10 to trigger the face payment device 10 to send the brightness data to the extended display device 20, or the user may set the backlight brightness on the extended display device 20, and the processor module 202 of the extended display device 20 receives the brightness operation data and sends the brightness operation data to the face payment device 10, and then triggers the face payment device 10 to send the brightness data to the extended display device 20.

Step 302: the processor module 202 receives the backlight brightness data, converts the brightness data into a PWM signal with a corresponding duty ratio by querying a PWM duty ratio and screen brightness correspondence table which is calibrated in advance, and outputs the PWM signal to the backlight driving module 206.

Step 303: the backlight driving module 206 converts the PWM signal received from the processor module 202 into a different voltage current signal to realize the control of the backlight brightness of the display module 201.

In summary, the extended display device provided in the embodiment of the present application has at least the following beneficial effects:

(1) the form is nimble to be switched, and the merchant can be according to the nimble switching between single screen or double screen equipment of actual demand, and plug and use along with, single screen or double screen equipment need not to bind supporting use, and the merchant selects more flexibly.

(2) The function is extensible, and the merchant can buy single screen equipment earlier, and face payment equipment promptly, and the later stage is bought the vice screen according to the demand again, and expansion display device promptly.

(3) The hardware scheme is succinct, and is with low costs, through the self-defined signal based on Type C physical interface, can multiplex HDMI, USB, power and other control signal's transmission to through positive and negative recognition of inserting and switching circuit, realize the ability of single Type C line transmission video, touch and control data, the practicality is better.

(4) The wire rod commonality is good, need not the customization wire rod alone, can multiplex present Type C physical interface and corresponding high-speed signal line, and full function Type C wire rod on the market can directly multiplex to the product, does not have the development production and the after-sale expense of extra customization wire rod, and then makes the single-screen or double-screen equipment room switch more convenient nimble.

(5) The application range is wide, and in essence, the self-defined USB Type C and the channel switching can be applied to the above-mentioned human face payment scenario, and also can be applied to other scenarios that need the above-mentioned multiplexing transmission of multiple data signals, such as a Virtual Reality (VR) helmet scenario.

Based on the same inventive concept, the embodiment of the present application further provides a face payment system, which includes the above-mentioned face payment device 10 and the extended display device 20, where both the face payment device 10 and the extended display device 20 include the above-mentioned extended connection interface, and further the face payment device 10 and the extended display device 20 are connected through the extended connection interface.

In one possible implementation, the expansion connection interface is a customized Universal Serial Bus (USB) typeC interface.

Since the structures and the work flows of the face payment device 10 and the extended display device 20 have been described in the above, reference may be made to the descriptions of the corresponding contents in the above, and redundant description is not repeated here.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. The extended display equipment of the face payment equipment is characterized by comprising a display module, a processor module, a video signal conversion module, an extended connection interface and an operation module, wherein the extended display equipment is connected with the face payment equipment through the extended connection interface;

2. The extended display device of claim 1, wherein the extended connection interface is a front-back symmetric interface, and a video signal end of the extended connection interface comprises:

the first pin pair comprises a first pin and a second pin and is used for transmitting one of a differential clock signal and a first differential data signal;

a second pin pair located at the opposite side of the first pin pair, including a third pin and a fourth pin, for transmitting the other of the differential clock signal or the first differential data signal;

a third pin pair including a fifth pin and a sixth pin, configured to transmit one of a second differential data signal and a third differential data signal;

a fourth pin pair located on the opposite side of the third pin pair, including a seventh pin and an eighth pin, for transmitting the other of the second differential data signal and the third differential data signal;

a ninth pin, configured to transmit one of a power-on signal and a hot plug detection signal;

a tenth pin located at an opposite side of the ninth pin and configured to transmit the other of the power-on signal or the hot plug detection signal;

an eleventh pin for transmitting one of a serial data signal or a serial control signal;

and a twelfth pin located at an opposite side of the eleventh pin and used for transmitting the other of the serial data signal or the serial control signal.

3. The extended display device of claim 2, further comprising a forward-backward insertion switching module;

the video signal conversion module is connected with a video signal end of the extended connection interface through the forward and reverse insertion switching module;

the forward and reverse insertion switching module switches a connection channel between the video signal end and the video signal conversion module according to the direction of the connector inserted by the extended connection interface, so that the video signal transmitted by the video signal end can be transmitted to the video signal conversion module when the connector is inserted positively and reversely.

4. The extended display device of claim 3, wherein the extended connection interface further comprises a positive and negative insertion detection terminal, the positive and negative insertion detection terminal being connected to the processor module;

the processor module determines the insertion direction of the connector according to the level value of the positive and negative insertion detection end and controls the positive and negative insertion switching module to switch to a connection channel corresponding to the insertion direction;

when the positive and negative insertion detection end is at a high level, the insertion direction of the connector is one of positive insertion or negative insertion, and when the positive and negative insertion detection end is at a low level, the insertion direction of the connector is the other of positive insertion or negative insertion.

5. The extended display device of claim 3, wherein the forward/reverse switching module comprises a first switch and a second switch, and further comprises a first selection terminal, a second selection terminal, a power-on signal terminal and a hot plug detection signal terminal; the first switch and the second switch comprise input ends, logic control ends, normally closed output ends and normally open output ends;

the ninth pin is connected with the input end of the first switch, the normally closed output end of the first switch is connected with the electrifying signal end and the first selection end, the normally open output end of the first switch is connected with the hot plug detection signal end, and the second selection end is connected with the logic control end of the first switch;

the tenth pin is connected with the input end of the second switch, the normally closed output end of the second switch is connected with the power-on signal end and the second selection end, the normally open output end of the second switch is connected with the hot plug detection signal end, and the first selection end is connected with the logic control end of the second switch;

when the insertion direction of the connector is positive insertion, the input end of the first switch is connected with a normally closed output end, the ninth pin outputs the power-on signal to the first selection end, so that the logic control end of the second switch is at a high level, the input end of the second switch is connected with the second normally open output end, and the second pin is communicated with the hot plug detection signal end;

when the inserting direction of the connector is reverse inserting, the input end of the second switch is connected with the normally closed output end, the tenth pin outputs the electrifying signal to the second selecting end, so that the logic control end of the first switch is in a high level, the input end of the first switch is connected with the first normally open output end, and the ninth pin is communicated with the hot plug detection signal end.

6. The extended display device of claim 5, wherein the forward-backward insertion switching module further comprises a third switch and a fourth switch, and further comprises a serial data signal terminal and a serial control signal terminal; the third switch and the fourth switch comprise input ends, logic control ends, normally closed output ends and normally open output ends;

the eleventh pin is connected with the normally-closed output end of the third switch, the twelfth pin is connected with the normally-open output end of the third switch, the logic control end of the third switch is connected with the second selection end, and the input end of the third switch is connected with the serial control signal end;

the eleventh pin is connected with a normally-open output end of the fourth switch, the twelfth pin is connected with a normally-closed output end of the fourth switch, a logic control end of the fourth switch is connected with the second selection end, and an input end of the fourth switch is connected with the serial data signal end;

when the insertion direction of the connector is positive insertion, the second selection end is at a low level, the input end of the third switch is connected with a normally open output end, the input end of the fourth switch is connected with a normally open output end, the eleventh pin is communicated with the serial data signal end, and the twelfth pin is communicated with the serial control signal end;

when the inserting direction of the connector is reverse inserting, the second selecting end is high level, the input end of the third switch is connected with the normally closed output end, the input end of the fourth switch is connected with the normally closed output end, the eleventh pin is communicated with the serial control signal end, and the twelfth pin is communicated with the serial data signal end.

7. The extended display device of claim 6, wherein a video signal conversion module is connected to the power-on signal terminal, the hot plug detect signal terminal, the serial data signal terminal, and the serial control signal terminal;

when the face payment device is connected with the extended display device through the connector, the video signal conversion module receives the power-on signal through the power-on signal end and returns the hot plug detection signal to the face payment device through the hot plug detection signal end when confirming that the face payment device is in a working state;

the face payment equipment sends a display information reading signal of the display module to the expansion display equipment based on the hot plug detection signal, and after the video signal conversion module receives the display information reading signal through the serial control signal end, the display information of the display module is sent to the face payment equipment through the serial data signal end, so that the face payment equipment generates a video stream matched with the module according to the display information.

8. The extended display device of claim 5, wherein the positive and negative insertion switching module further comprises a differential signal exchanger, the differential signal exchanger comprising a logic control terminal, 4 pairs of differential signal input terminals, and 4 pairs of differential signal output terminals;

the logic control end is connected with the second selection end, and the 4 pairs of differential signal input ends are respectively connected with the first pin pair, the second pin pair, the third pin pair and the fourth pin pair;

when the insertion direction of the connector is positive insertion, the second selection end is at a low level, the differential signal exchanger is in a through state, and the 4 pairs of differential signal input ends are correspondingly connected with the 4 pairs of differential signal output ends;

when the insertion direction of the connector is reverse insertion, the second selection terminal is at a high level, the differential signal exchanger is in a cross conduction state, and the 4 pairs of differential signal input terminals and the 4 pairs of differential signal output terminals are in cross connection.

9. The extended display device of claim 1, wherein the extended connection interface further comprises a key value signal terminal, the extended display device further comprises a touch module and/or a matrix keyboard connection interface, and the processor module is connected to the matrix keyboard through the matrix keyboard connection interface;

the processor module acquires key values of operated keys in the matrix keyboard through the matrix keyboard connecting interface, processes the key values according to a set keyboard data transmission protocol and sends the key values to the face payment equipment through the key value signal terminal; and the number of the first and second groups,

the touch module is connected with the processor module, the processor module is connected with the touch signal end of the extended connection interface, and based on a touch event detected by the touch module, the processor module is triggered to acquire touch data, process the touch data according to a set touch data transmission protocol and send the touch data to the face payment equipment through the touch signal end.

10. The extended display device of claim 9, wherein the matrix keyboard connection interface is a General Purpose Input Output (GPIO) interface, the GPIO interface comprising a plurality of status terminals;

and the processor module determines the key values of the operated keys according to the states of the plurality of state ends and the corresponding relations between the states of the plurality of state ends and the key values.

11. The extended display device of claim 1, further comprising a backlight driving module, the backlight driving module respectively connecting the processor module and the display module;

the processor module generates a backlight driving signal corresponding to a backlight value indicated by the backlight adjusting signal based on the received backlight adjusting signal and outputs the backlight driving signal to the backlight driving module, and the backlight driving module converts the backlight driving signal into a corresponding current signal or voltage signal and outputs the current signal or voltage signal to the display module so as to adjust the backlight brightness of the display module.

12. The extended display device of claim 1, further comprising a memory module, the memory module being connected to the touch module and the processor module, respectively;

when the touch module detects a touch event, the touch module stores touch data to the storage module and sends an interrupt signal to the processor module;

the processor module reads the touch data from the storage module based on the interrupt signal.

13. The extended display device of claim 1, wherein the processor module is connected to the video signal conversion module;

the processor module acquires the firmware program of the video signal conversion module from the human face payment equipment through the expansion connection interface and stores the firmware program into the storage module;

the processor module updates the firmware program to the video signal conversion module through a connecting channel between the processor module and the video signal conversion module so as to initialize the video signal conversion module.

14. A face payment system, comprising a face payment device and an extended display device according to any one of claims 1 to 13;

15. The face payment system of claim 14, wherein the extended connection interface is a Universal Serial Bus (USB) typeC interface.