An MST display extended control circuit and device

Abstract

This invention discloses an MST display expansion control circuit and device. The MST display expansion control circuit includes: a first TYPE-C interface module, a first display processing module, a second display processing module, a first display module, and a second display module. The first TYPE-C interface module is electrically connected to both the first and second display processing modules. The first display processing module is electrically connected to the second display processing module. Alternatively, the first display processing module is electrically connected to the first display module, and the second display processing module is electrically connected to the second display module; or, the first display processing module is electrically connected to the second display module, and the second display processing module is electrically connected to the first display processing module. This invention enables MST multi-screen display expansion without requiring a separate PD management chip, resulting in low cost and a superior user experience.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to an MST display extension control circuit and device. Background Technology

[0002] With the continuous updates and upgrades of computers and other terminal devices, graphics card performance is also advancing rapidly. To meet users' demands for high-definition, high-speed, and efficient visual experiences, most terminal devices are equipped with a Type-C interface. The Type-C interface is a new type of reversible pluggable interface with advantages such as high transmission speed, strong compatibility, and support for multiple functions. One important function is support for Multiple Stream Transmission (MST). Furthermore, multi-screen output is needed in many office and entertainment settings. Multi-screen output refers to using two or more monitors simultaneously on a single computer to expand desktop space or replicate the same screen. Multi-screen output offers many benefits, such as improving productivity and efficiency in office, gaming, and entertainment scenarios; enhancing visual effects and immersion; and facilitating multitasking and application switching and management. Therefore, multi-screen output has become a common need and choice for many users.

[0003] The common approach in the prior art is to integrate a display driver chip and a PD management chip on the driver board. The display driver chip is responsible for converting the video signal input from the TYPE-C interface into a signal suitable for display on the monitor and distributing it to the two monitors; the PD management chip is responsible for detecting, controlling and distributing the power signal input from the TYPE-C interface to provide appropriate voltage and current to the driver board and the monitors. Although this approach can achieve dual-screen output, it also has some drawbacks, mainly as follows: (1) A separate PD management chip is required, which increases the size, complexity and power consumption of the driver board; (2) The PD management chip itself is expensive, which increases the cost of the driver board and the monitors; (3) An additional communication interface and protocol are required between the PD management chip and the display driver chip, which increases the design difficulty and compatibility issues.

[0004] Therefore, how to achieve multi-screen output to enhance the office and entertainment experience, and how to design a dual-screen MST circuit and device that does not require a separate PD management chip without affecting the usability and functionality, so as to reduce production costs and improve performance, are problems that urgently need to be solved in the current technical field. Summary of the Invention

[0005] The purpose of this application is to provide an MST display expansion control circuit and device. In this solution, MST multi-screen display expansion can be realized without the need to add a separate PD management chip, which is low in cost and provides a high user experience.

[0006] To address the aforementioned technical problems, this application provides an MST display extension control circuit, comprising a first TYPE-C interface module, a first display processing module, a second display processing module, a first display module, and a second display module;

[0007] The first TYPE-C interface module is electrically connected to both the first display processing module and the second display processing module, and the first display processing module is electrically connected to the second display processing module.

[0008] The first display processing module is electrically connected to the first display module, and the second display processing module is electrically connected to the second display module; or, the first display processing module is electrically connected to the second display module, and the second display processing module is electrically connected to the first display processing module.

[0009] The first TYPE-C interface module is used to receive video signals from the terminal device and transmit the video signals to the first display processing module through multi-data stream transmission;

[0010] The first display processing module is used to receive the video signal for display processing and drive the first display module to work for screen output.

[0011] The first display processing module is used to transmit the video signal to the second display processing module via multi-data stream transmission;

[0012] The second display processing module is used to receive the video signal for display processing and drive the second display module to perform screen output.

[0013] Preferably, the MST display extension control circuit further includes a second TYPE-C interface module;

[0014] The second TYPE-C interface module is electrically connected to both the first display processing module and the second display processing module.

[0015] The second TYPE-C interface module is used to connect to the PD charging device, and the second TYPE-C interface module is used to transmit power signals from the PD charging device.

[0016] Preferably, the MST display extended control circuit further includes a switching module and an electric induction module;

[0017] The switching module is electrically connected to the first TYPE-C interface module and the second TYPE-C interface module respectively;

[0018] The electric induction module is electrically connected to the first TYPE-C interface module and the second TYPE-C interface module respectively;

[0019] The switching module is electrically connected to the second display processing module, and the electric current induction module is electrically connected to the second display processing module.

[0020] Preferably, the MST display extension control circuit further includes a firmware upgrade module;

[0021] The firmware upgrade module is electrically connected to the first TYPE-C interface module, the second TYPE-C interface module, the first display processing module, and the second display processing module, respectively.

[0022] Preferably, the firmware upgrade module includes a first firmware upgrade control unit and a second firmware upgrade control unit;

[0023] The first firmware upgrade control unit is electrically connected to the first TYPE-C interface module and the first display processing module, respectively.

[0024] The second firmware upgrade control unit is electrically connected to the second TYPE-C interface module and the second display processing module, respectively.

[0025] Preferably, the first TYPE-C interface module includes a first TYPE-C interface and a first electrostatic discharge suppression unit;

[0026] The first TYPE-C interface is electrically connected to the first electrostatic discharge suppression unit, and the first electrostatic discharge suppression unit is electrically connected to the first display processing module and the second display processing module, respectively.

[0027] Preferably, the second TYPE-C interface module includes a second TYPE-C interface and a second electrostatic discharge suppression unit;

[0028] The second TYPE-C interface is electrically connected to the second electrostatic discharge suppression unit, and the second electrostatic discharge suppression unit is electrically connected to both the first display processing module and the second display processing module.

[0029] Preferably, the switching module includes a first switching unit and a second switching unit;

[0030] The first switching unit is electrically connected to the first TYPE-C interface module, the second TYPE-C interface module, the second display processing module, the electric induction module, and the second switching unit, respectively.

[0031] The second switching unit is electrically connected to the first TYPE-C interface module, the second TYPE-C interface module, the second display processing module, the electric induction module, and the first switching unit, respectively.

[0032] Preferably, the electro-inducing module includes a first electro-inducing unit and a second electro-inducing unit;

[0033] The first induction unit is electrically connected to the first TYPE-C interface module, the second display processing module, and the system power supply, respectively.

[0034] The second induction unit is electrically connected to the second TYPE-C interface module, the second display processing module, and the system power supply, respectively.

[0035] To address the aforementioned technical problems, this application provides an MST display extension control device, including the aforementioned MST display extension control circuit.

[0036] The MST display expansion control circuit of the present invention has the following beneficial effects. The MST display expansion control circuit disclosed in this invention includes: a first TYPE-C interface module, a first display processing module, a second display processing module, a first display module, and a second display module; the first TYPE-C interface module is electrically connected to both the first and second display processing modules; the first display processing module is electrically connected to the second display processing module; the first display processing module is electrically connected to the first display module, and the second display processing module is electrically connected to the second display module; or, the first display processing module is electrically connected to the second display module, and the second display processing module is electrically connected to the first display processing module; the first TYPE-C interface module is used to receive video signals from a terminal device and transmit the video signals to the first display processing module through multi-data stream transmission; the first display processing module is used to receive the video signals, perform display processing, and drive the first display module to perform screen-by-screen output; the first display processing module is used to transmit the video signals to the second display processing module through multi-data stream transmission; the second display processing module is used to receive the video signals, perform display processing, and drive the second display module to perform screen-by-screen output. Therefore, the present invention can realize MST multi-screen display expansion, resulting in a high user experience. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0038] Figure 1 This is a schematic diagram of the structure of an MST display extension control circuit according to a preferred embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of another MST display extension control circuit according to a preferred embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of another MST display extension control circuit according to a preferred embodiment of the present invention;

[0041] Figure 4 This is a circuit schematic diagram of a firmware upgrade module for an MST display extension control circuit according to a preferred embodiment of the present invention;

[0042] Figure 5 and Figure 6 This is a circuit schematic diagram of the first TYPE-C interface module of an MST display extension control circuit according to a preferred embodiment of the present invention;

[0043] Figure 7 and Figure 8 This is a circuit schematic diagram of the second TYPE-C interface module of an MST display extension control circuit according to a preferred embodiment of the present invention;

[0044] Figure 9 This is a circuit schematic diagram of the first switching unit of an MST display extension control circuit according to a preferred embodiment of the present invention;

[0045] Figure 10 This is a circuit schematic diagram of the second switching unit of an MST display extension control circuit according to a preferred embodiment of the present invention;

[0046] Figure 11 This is a circuit diagram of the first induction unit of an MST display extension control circuit according to a preferred embodiment of the present invention;

[0047] Figure 12 This is a circuit diagram of the second electrification unit of an MST display extension control circuit according to a preferred embodiment of the present invention. Detailed Implementation

[0048] The core of this application is to provide an MST display expansion control circuit and device. In this solution, MST multi-screen display expansion can be realized without the need to add a separate PD management chip, which is low in cost and provides a high user experience.

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] Please see Figure 1 , Figure 1A schematic diagram of the structure of an MST display extension control circuit provided in this application includes a first TYPE-C interface module 1, a first display processing module 2, a second display processing module 3, a first display module 4, and a second display module 5;

[0051] The first TYPE-C interface module 1 is electrically connected to the first display processing module 2 and the second display processing module 3 respectively, and the first display processing module 2 is electrically connected to the second display processing module 3;

[0052] The first display processing module 2 is electrically connected to the first display module 4, and the second display processing module 3 is electrically connected to the second display module 5; or, the first display processing module 2 is electrically connected to the second display module 5, and the second display processing module 3 is electrically connected to the first display processing module 2.

[0053] The first TYPE-C interface module 1 is used to receive video signals from the terminal device and transmit the video signals to the first display processing module 2 through multi-data stream transmission;

[0054] The first display processing module 2 is used to receive video signals for display processing and drive the first display module 4 to work for screen output.

[0055] The first display processing module 2 is used to transmit video signals to the second display processing module 3 via multi-data stream transmission;

[0056] The second display processing module 3 is used to receive video signals for display processing and drive the second display module 5 to perform screen output.

[0057] To address the aforementioned shortcomings, this application implements MST multi-screen display expansion through the cooperation of the first TYPE-C interface module 1, the first display processing module 2, the second display processing module 3, the first display module 4, and the second display module 5.

[0058] Specifically, the first TYPE-C interface module 1 is connected to the computer device. The first TYPE-C interface module 1 receives the video signal and transmits the video signal to the first display processing module 2 through MST. The first display processing module 2 processes the video signal and outputs it to the screen. The first display processing module 2 also transmits the video signal to the second display processing module 3 through DP TX MST. The second display processing module 3 processes the video signal and outputs it to the screen, thereby realizing dual-screen display extended by the TYPE-C interface MST.

[0059] Specifically, in this embodiment, MST achieves multi-video display by dividing the video signal into multiple digital signals at the source and then transmitting them to the corresponding displays through multiple transmission lines.

[0060] Specifically, in this embodiment, the chip model of the first display processing module 2 is set to RTD2785T. In another preferred embodiment, the chip model of the first display processing module 2 is not specifically limited.

[0061] Specifically, in this embodiment, the chip model of the second display processing module 3 is set to RTD2555T. In another preferred embodiment, the chip model of the second display processing module 3 is not specifically limited.

[0062] In summary, this application provides an MST display extension control circuit. In this solution, there is a first TYPE-C interface module 1, a first display processing module 2, a second display processing module 3, a first display module 4, and a second display module 5. The first TYPE-C interface module 1 is electrically connected to both the first display processing module 2 and the second display processing module 3; the first display processing module 2 is electrically connected to the second display processing module 3; the first display processing module 2 is electrically connected to the first display module 4; and the second display processing module 3 is electrically connected to the second display module 5. Alternatively, the first display processing module 2 is electrically connected to the second display module 5, and the second display processing module 3 is electrically connected to the first display processing module 2. The first TYPE-C interface module 1 receives video signals from a terminal device and transmits these signals to the first display processing module 2 via multi-data stream transmission. The first display processing module 2 receives the video signals, performs display processing, and drives the first display module 4 to output the displayed signal. The first display processing module 2 also transmits the video signals to the second display processing module 3 via multi-data stream transmission. The second display processing module 3 receives the video signals, performs display processing, and drives the second display module 5 to output the displayed signal. Therefore, this invention can realize MST multi-screen display expansion, resulting in a high user experience.

[0063] Based on the above embodiments:

[0064] Please refer to Figure 2 , Figure 2 A schematic diagram of another MST display extension control circuit provided in this application.

[0065] In a preferred embodiment, an MST display extension control circuit further includes a second TYPE-C interface module 6;

[0066] The second TYPE-C interface module 6 is electrically connected to the first display processing module 2 and the second display processing module 3 respectively;

[0067] The second TYPE-C interface module 6 is used to connect to the PD charging device and to transmit power signals from the PD charging device.

[0068] Specifically, in this embodiment, the first TYPE-C interface module 1 is fixedly used to connect to the source device to realize multi-screen extended display.

[0069] Specifically, in this embodiment, the second TYPE-C interface module 6 is fixedly used to connect to the PD device, and the PD device enables fast charging of the extended display screen.

[0070] Please refer to Figure 3 , Figure 3 A schematic diagram of another MST display extension control circuit provided in this application.

[0071] In a preferred embodiment, an MST display extended control circuit further includes a switching module 7 and an electric induction module 8;

[0072] The switching module 7 is electrically connected to the first TYPE-C interface module 1 and the second TYPE-C interface module 6 respectively;

[0073] The induction module 8 is electrically connected to the first TYPE-C interface module 1 and the second TYPE-C interface module 6 respectively;

[0074] The switching module 7 is electrically connected to the second display processing module 3, and the induction module 8 is electrically connected to the second display processing module 3.

[0075] Specifically, when both the first TYPE-C interface module 1 and the second TYPE-C interface module 6 have devices inserted—that is, when the first TYPE-C interface module 1 has a source device inserted and the second TYPE-C interface module 6 has a PD device inserted, or vice versa—the current-inducing module 8 provides an external pull-down current-inducing signal to the second display processing module 3, thereby transmitting the source device insertion signal and the PD device insertion signal to the second display processing module 3. It can be understood that the switching module 7 is used to switch the CC communication line connection between the second display processing module 3 and either the first TYPE-C interface module 1 or the second TYPE-C interface module 6. In this embodiment, the device inserted first, either the source device or the PD device, completes communication first. After communication with one Type-C interface module is completed, the connection is switched to the other Type-C interface module to achieve time-division communication.

[0076] Specifically, when the source device does not support DRP mode, the system transmits display signals internally to achieve multi-screen extended display; at the same time, the PD device only performs fast charging on the first or second display, and does not perform fast charging on the source device.

[0077] For display signal transmission, for example, when the source device is inserted into the first TYPE-C interface module 1, the induction module 8 transmits the source device insertion signal to the second display processing module 3. The second display processing module 3 then notifies the first display processing module 2 of a device insertion via UART / IO, informing it of the device's status. After configuring the DP input port according to the status, the first display processing module 2 notifies the second display processing module 3 via UART / IO that it is ready. The second display processing module 3 then begins requesting video from the source device. The DP display signal from the source device is transmitted to the DP input port of the first display processing module 2 via MST. Upon receiving the DP display signal, the first display processing module 2 then transmits the DP display signal to the DP input port of the second display processing module 3 via DP TX MST. After detecting the DP display signal, the second display processing module 3 notifies the first display processing module 2 via UART / IO that the signal has been captured. If the first display processing module 2 fails to detect the notification that the second display processing module 3 has captured the signal within a timeout period, it will use UART / IO to notify the second display processing module 3 again to request video from the device, thereby realizing dual-screen extended display from the TYPE-C interface MST to two monitors.

[0078] For PD fast charging, for example, when the PD device is inserted into the second TYPE-C interface module 6, the PD device and the second display processing module 3 communicate to switch power roles, switching the second display terminal to SINK power reception; and informing the second display terminal of the PD device's charging level; the second display terminal requests the corresponding charging level 5-20V, thus completing the power communication to achieve fast charging control of the display terminal by the PD device. It is understandable that fast charging of the first display terminal by the PD device can be achieved through PD communication between the first display processing module 2 and the second display processing module 3, and will not be elaborated further here.

[0079] Specifically, when both the first TYPE-C interface module 1 and the second TYPE-C interface module 6 have devices inserted, and the inserted devices are a source device and a PD device respectively, and the source device supports DRP mode, this embodiment can control the power communication between the PD device and the source device, and realize the fast charging control of the source device by the PD device.

[0080] For example, when the first TYPE-C interface module 1 is inserted into the source device and the second TYPE-C interface module 6 is inserted into the PD device, the second display processing module 3 controls the switching module 7 to switch the CC communication line to the second TYPE-C interface module 6 inserted into the PD device to request the charging level of the source device from the PD device. The second display processing module 3 then controls the switching module 7 to switch the CC communication line back to the first TYPE-C interface module 1 inserted into the source device to inform the source device of the charging level offered by the PD device. Specifically, when the second display processing module 3 controls the switching module 7 to switch the CC communication line to the first TYPE-C interface module 1 inserted into the source device, the power-inducing module 8 is switched to connect to the second TYPE-C interface module 6 inserted into the PD device. When the second display processing module 3 controls the switching module 7 to switch the CC communication line to the second TYPE-C interface module 6 inserted into the PD device, the power-inducing module 8 is switched back to the first TYPE-C interface module 1 inserted into the source device. The second display processing module 3 controls the power communication between the PD device and the source device, and realizes the fast charging control of the source device by the PD device.

[0081] Specifically, in this embodiment, the first TYPE-C interface module 1 and the second TYPE-C interface module 6 determine whether the connected device is a source device or a PD device by acquiring the voltage and VDM information of the VBUS pin. If the voltage of the VBUS pin is greater than 4.3V and there is VDM information, the inserted device can be determined to be a source device; if the voltage of the VBUS pin is greater than 4.3V and there is no VDM information, the inserted device can be determined to be a PD device.

[0082] Please refer to Figure 4 , Figure 4 The circuit schematic diagram of a firmware upgrade module provided in this application.

[0083] In a preferred embodiment, an MST display extension control circuit further includes a firmware upgrade module 9;

[0084] The firmware upgrade module 9 is electrically connected to the first TYPE-C interface module 1, the second TYPE-C interface module 6, the first display processing module 2, and the second display processing module 3, respectively.

[0085] In a preferred embodiment, the firmware upgrade module 9 includes a first firmware upgrade control unit 91 and a second firmware upgrade control unit 92;

[0086] The first firmware upgrade control unit 91 is electrically connected to the first TYPE-C interface module 1 and the first display processing module 2 respectively;

[0087] The second firmware upgrade control unit 92 is electrically connected to the second TYPE-C interface module 6 and the second display processing module 3, respectively.

[0088] Specifically, the first firmware upgrade control unit 91 is used to implement firmware upgrades for the first TYPE-C interface module 1, and the second firmware upgrade control unit 92 is used to implement firmware upgrades for the second firmware upgrade control unit 92.

[0089] Specifically, in this embodiment, the chip model of both the first firmware upgrade control unit 91 and the second firmware upgrade control unit 92 is set to SGM3002XMS. It is understood that the SGM3002XMS is a single-pole double-throw analog signal switch chip. When a firmware upgrade is required, the SGM3002XMS is in a closed state, thereby realizing firmware transmission. In another preferred embodiment, the chip model of the first firmware upgrade control unit 91 and the second firmware upgrade control unit 92 is not specifically limited.

[0090] Please refer to Figure 5 and Figure 6 , Figure 5 and Figure 6 The circuit schematic diagram of a first TYPE-C interface module provided in this application.

[0091] In a preferred embodiment, the first TYPE-C interface module 1 includes a first TYPE-C interface 11 and a first electrostatic discharge suppression unit 12;

[0092] The first TYPE-C interface 11 is electrically connected to the first electrostatic discharge suppression unit 12, and the first electrostatic discharge suppression unit 12 is electrically connected to the first display processing module 2 and the second display processing module 3 respectively.

[0093] Specifically, in this embodiment, the first electrostatic discharge (ESD) suppression unit 12 is used to implement ESD protection for the signal transmission of the first TYPE-C interface module 1. The chip model of the first ESD suppression unit 12 is set to WS05-4R2. In another preferred embodiment, the chip model of the first ESD suppression unit 12 is not specifically limited.

[0094] Please refer to Figure 7 and Figure 8 , Figure 7 and Figure 8 The circuit schematic diagram of a first TYPE-C interface module provided in this application.

[0095] In a preferred embodiment, the second TYPE-C interface module 6 includes a second TYPE-C interface 61 and a second electrostatic discharge suppression unit 62;

[0096] The second TYPE-C interface 61 is electrically connected to the second electrostatic discharge suppression unit, which is electrically connected to the first display processing module 2 and the second display processing module 3 respectively.

[0097] Specifically, in this embodiment, the second electrostatic discharge (ESD) suppression unit 62 is used to implement ESD protection for signal transmission of the second TYPE-C interface 61. The chip model of the second ESD suppression unit 62 is set to WS05-4R2. In another preferred embodiment, the chip model of the second ESD suppression unit 62 is not specifically limited.

[0098] Please refer to Figure 9 , Figure 9 A circuit schematic diagram of a first switching unit provided in this application.

[0099] Please refer to Figure 10 , Figure 10 A circuit schematic diagram of a first switching unit provided in this application.

[0100] In a preferred embodiment, the switching module 7 includes a first switching unit and a second switching unit;

[0101] The first switching unit is electrically connected to the first TYPE-C interface module 1, the second TYPE-C interface module 6, the second display processing module 3, the electric induction module 8, and the second switching unit, respectively.

[0102] The second switching unit is electrically connected to the first TYPE-C interface module 1, the second TYPE-C interface module 6, the second display processing module 3, the electric induction module 8, and the first switching unit, respectively.

[0103] Specifically, in this embodiment, when the source device internally supports DRP mode, the present invention can control the PD device to achieve fast charging control of the source device. When the first Type-C interface module 2 is inserted into the PD device and the second Type-C interface module 3 is inserted into the source device, after switching the first switching unit to the power level required by the source device, the second display processing module 3 switches to SRC mode. The second display processing module 3 switches the second switching unit to the CC communication of the source device, thereby maintaining the communication connection between the source device and the second display processing module 3. The second display processing module 3 switches the first switching unit to the PD device and establishes a communication connection with the PD device through the CC communication line of the second display processing module 3 using an internal pull-down resistor. After the communication is established, it requests the charging level required by the source device from the PD device. After the PD device accepts, the second display processing module 3 connects the power-inducing module 8 to the first Type-C interface module 2 where the PD device is located. The second display processing module 3 returns to the source device through the first switching unit and informs the source device PS_RDY, thereby completing one power communication.

[0104] Specifically, in this embodiment, the first switching unit and the second switching unit are implemented using an MSUSB30. In another preferred embodiment, the chip model of the first switching unit and the second switching unit is not specifically limited.

[0105] Please refer to Figure 11 , Figure 11 A circuit diagram of a first induction unit provided in this application.

[0106] Please refer to Figure 12 , Figure 12 A circuit diagram of a second electro-energizing unit provided in this application.

[0107] In a preferred embodiment, the electro-energizing module 8 includes a first electro-energizing unit 81 and a second electro-energizing unit 82;

[0108] The first electro-energizing unit 81 is electrically connected to the first TYPE-C interface module 11, the second display processing module 3, and the system power supply, respectively.

[0109] The second electrical induction unit 82 is electrically connected to the second TYPE-C interface module, the second display processing module 3, and the system power supply, respectively.

[0110] Specifically, in this embodiment, when the PD fast charging device is connected, the first transistor QD11 or the second transistor QD13 is turned on, the CC pin of the first TYPE-C interface module 1 is pulled down, the second display processing module 3 is initialized, the first PMOS transistor QD9 is turned on, and the second display processing module 3 communicates with the PD device and exchanges power.

[0111] Specifically, when the entire board is de-energized, resistor RD37 is used to turn on the first transistor QD11, resistor RD62 is used as an external pull-up resistor for the pin of the second display processing module 3, and resistors RD3 and RD13 are pull-down resistors for the first Type-C interface module 2. The first power-inducing unit also includes resistors RD8, RD6, and RD4, wherein resistors RD8 and RD6 are the base resistors of the first transistor QD11 and the second transistor QD13, respectively, and resistor RD4 is a test voltage divider resistor.

[0112] Specifically, the circuit structure and principle of the second induction unit are the same as those of the first induction unit, and will not be described again here.

[0113] Specifically, when the source device is connected, the third transistor QD12 or the fourth transistor QD14 is turned on, the CC pin of the second Type C interface module is pulled down, the second display processing module 3 is initialized, the second PMOS transistor QD10 is turned on, the second display processing module 3 establishes communication with the source device, and induces the source device to power.

[0114] Therefore, this invention can realize MST multi-screen display expansion; in addition, it can realize dual blind insertion of TYPE-C interface without adding a separate PD management chip. External PD devices can realize fast charging control of multiple displays and fast charging control of external new power devices, which is low cost and high user experience.

[0115] This application also provides an MST display extension control device, including an MST display extension control circuit.

[0116] For a description of the MST display extension control circuit provided in this application, please refer to the above embodiments; further details will not be repeated here.

[0117] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0118] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An MST display extension control circuit, characterized in that, It includes a first TYPE-C interface module, a first display processing module, a second display processing module, a first display module, and a second display module; The first TYPE-C interface module is electrically connected to both the first display processing module and the second display processing module, and the first display processing module is electrically connected to the second display processing module. The first display processing module is electrically connected to the first display module, and the second display processing module is electrically connected to the second display module; The first TYPE-C interface module is used to receive video signals from the terminal device and transmit the video signals to the first display processing module through multi-data stream transmission; The first display processing module is used to receive the video signal for display processing and drive the first display module to work for screen output. The first display processing module is used to transmit the video signal to the second display processing module via multi-data stream transmission; The second display processing module is used to receive the video signal for display processing and drive the second display module to work for screen output; The MST display extension control circuit also includes a second TYPE-C interface module; The second TYPE-C interface module is electrically connected to both the first display processing module and the second display processing module. The second TYPE-C interface module is used to connect to the PD charging device, and the second TYPE-C interface module is used to transmit power signals from the PD charging device; The MST display extended control circuit also includes a switching module and an electric induction module; The switching module is electrically connected to the first TYPE-C interface module and the second TYPE-C interface module respectively; The electric induction module is electrically connected to the first TYPE-C interface module and the second TYPE-C interface module respectively; The switching module is electrically connected to the second display processing module, and the electric current induction module is electrically connected to the second display processing module; When the terminal device and the PD charging device are connected to the MST display extension control circuit, the power-inducing module provides external power-inducing to the second display processing module, thereby transmitting the insertion signal of the terminal device and the insertion signal of the PD charging device to the second display processing module. The second display processing module notifies the first display processing module of the connection status between the terminal device and the PD charging device, so that the first display processing module configures the DP input port according to the connection status. After the DP input port is configured, the second display processing module requests the terminal device to output the video signal.

2. The MST display extension control circuit according to claim 1, characterized in that, The MST display extended control circuit also includes a firmware upgrade module; The firmware upgrade module is electrically connected to the first TYPE-C interface module, the second TYPE-C interface module, the first display processing module, and the second display processing module, respectively.

3. The MST display extension control circuit according to claim 2, characterized in that, The firmware upgrade module includes a first firmware upgrade control unit and a second firmware upgrade control unit. The first firmware upgrade control unit is electrically connected to the first TYPE-C interface module and the first display processing module, respectively. The second firmware upgrade control unit is electrically connected to the second TYPE-C interface module and the second display processing module, respectively.

4. The MST display extension control circuit according to claim 1, characterized in that, The first TYPE-C interface module includes a first TYPE-C interface and a first electrostatic discharge suppression unit; The first TYPE-C interface is electrically connected to the first electrostatic discharge suppression unit, and the first electrostatic discharge suppression unit is electrically connected to the first display processing module and the second display processing module, respectively.

5. The MST display extension control circuit according to claim 1, characterized in that, The second TYPE-C interface module includes a second TYPE-C interface and a second electrostatic discharge suppression unit; The second TYPE-C interface is electrically connected to the second electrostatic discharge suppression unit, and the second electrostatic discharge suppression unit is electrically connected to both the first display processing module and the second display processing module.

6. The MST display extension control circuit according to claim 1, characterized in that, The switching module includes a first switching unit and a second switching unit; The first switching unit is electrically connected to the first TYPE-C interface module, the second TYPE-C interface module, the second display processing module, the electric induction module, and the second switching unit, respectively. The second switching unit is electrically connected to the first TYPE-C interface module, the second TYPE-C interface module, the second display processing module, the electric induction module, and the first switching unit, respectively.

7. The MST display extension control circuit according to claim 1, characterized in that, The electro-inducing module includes a first electro-inducing unit and a second electro-inducing unit; The first induction unit is electrically connected to the first TYPE-C interface module, the second display processing module, and the system power supply, respectively. The second induction unit is electrically connected to the second TYPE-C interface module, the second display processing module, and the system power supply, respectively.

8. An MST display extended control device, characterized in that, Includes an MST display extension control circuit as described in any one of claims 1 to 7.

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