A multi-vendor split television system special-shaped interface seat bidirectional conversion circuit

Abstract

The utility model discloses a kind of special-shaped interface seat bidirectional conversion circuit of multi-vendor split television system, including connecting seat, HDMI interface and control panel, connecting seat is equipped with with special-shaped interface seat butt joint adaptation card tongue, several contact terminals are integrated in it;Control panel is set in connecting seat, and power supply circuit, main control circuit, configurable screen wake-up circuit and storage circuit are set on it;Through the lossless insertion of adaptation card tongue and special-shaped interface seat connecting line, using control panel and main control circuit realize: bidirectional protocol signal lossless conversion, special-shaped interface signal is directly converted into standard HDMI signal, input / output double mode function is supported synchronously;Manual modification design is removed, eliminate the drawbacks of cable breaking and welding process, eliminate the dependence on manufacturer's special parts, significantly reduce use cost;This circuit design has broken through the maintenance, accessory shortage predicament caused by manufacturer stop production for split television system, provides full compatibility solution for split television system equipment.

Description

Technical Field

[0001] This utility model relates to the field of television equipment technology, and in particular to a bidirectional conversion circuit for a non-standard interface socket of a multi-manufacturer split television system. Background Technology

[0002] Between 2015 and 2020, domestic TV manufacturers such as LeEco, Xiaomi, and Baofeng successively launched TV systems with a split design. A split TV system consists of three parts: a dedicated split TV screen, a dedicated control center (host), and a dedicated, non-standard interface connector cable connecting the two. This dedicated interface differs from all universal interface standards on the market, being developed independently by each manufacturer, forming a closed ecosystem. However, due to short product lifecycles and the poor management or even bankruptcy of some manufacturers, after-sales service for related products was interrupted, and spare parts production ceased. This resulted in consumers and repair personnel facing severe problems such as difficulty in repairing equipment when it breaks down, and a scarcity and high price of dedicated spare parts.

[0003] When any component of a split-type TV system—the screen or the control center (host)—is damaged or lost, the entire system will be unusable. Current solutions rely solely on destructive methods: manually disconnecting the dedicated HDMI connector cable and then soldering the broken wire back to the HDMI circuit board according to the matching HDMI wiring sequence to allow the use of a single component within the split-type TV system. This method has the following significant drawbacks:

[0004] 1. Incomplete conversion protocol (one-way): Existing technology can only achieve unidirectional signal conversion, specifically manifested as follows:

[0005] Either implement HDMI input to irregular interface conversion (only supports input from dedicated screen terminals), or implement irregular interface output to HDMI conversion (only supports output from dedicated host terminals).

[0006] One-way signal conversion relies on destructive cable breaking and soldering, the operation is irreversible, it cannot achieve lossless conversion, and it cannot simultaneously meet the usage requirements of the screen end or the host end.

[0007] 2. Lack of multi-device input switching capability: Manual modification is limited by a single cable and a single solder point, and can only correspond to a single HDMI interface. This means that when using a dedicated screen, only a single device can be input, which completely fails to meet the actual application scenarios where users can easily switch between multiple devices (such as set-top boxes, game consoles, and media players).

[0008] 3. Inability to adapt to special power supply and control requirements: Some manufacturers' split systems require external DC power supply and relay control logic. Existing destructive modification methods cannot provide or simulate these necessary circuit supports, making it impossible to drive such split TV systems through modification.

[0009] 4. Market Solution Gap: Due to the short-lived existence and varying standards of the dedicated irregular interfaces for split-type TV systems, there is currently a lack of unified and lossless solutions specifically for such systems on the market.

[0010] Therefore, there is an urgent need for a bidirectional conversion circuit for irregularly shaped interface sockets that can solve all the above problems and support multi-vendor split-type TV systems. Utility Model Content

[0011] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a bidirectional conversion circuit for a non-standard interface socket in a multi-manufacturer split-type television system.

[0012] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a bidirectional conversion circuit for a non-standard interface socket of a multi-manufacturer split TV system, including a connector, an HDMI interface and a control board. The connector is provided with an adapter tongue for docking with the non-standard interface socket and a plurality of contact terminals disposed within the adapter tongue. The non-standard interface socket is connected to a first display device or a host. The HDMI interface is disposed on the connector for connecting an HDMI signal source or a second display device. The control board is disposed within the connector and is provided with a power supply circuit, a main control circuit, a screen wake-up circuit and a storage circuit.

[0013] The power supply circuit is connected to an external power source;

[0014] The main control circuit is connected to the power supply circuit, contact terminals, and HDMI interface respectively;

[0015] The screen wake-up circuit is connected to the power supply circuit, the irregular interface socket, the contact terminal and the main control circuit respectively, and is used to wake up the first display device or the second display device.

[0016] The storage circuit is connected to the power supply circuit and the main control circuit respectively, and is used to store the handshake data of the first display device or the second display device.

[0017] As one of the preferred embodiments of this utility model, a bidirectional conversion circuit for a non-standard interface socket of a multi-manufacturer split TV system also includes a button circuit that is connected to the power supply circuit and the main control circuit respectively.

[0018] As one of the preferred embodiments of this utility model, the button circuit includes a resistor R6, a capacitor C9, and a button KEY1. One end of the resistor R6 is connected to the power supply circuit, and the other end of the resistor R6 is connected to the main control circuit, one end of the capacitor C9, and one end of the button KEY1. The other end of the button KEY1 and the other end of the capacitor C9 are connected to the GND terminal.

[0019] As one of the preferred embodiments of this utility model, a bidirectional conversion circuit for a non-standard interface socket of a multi-manufacturer split TV system also includes an infrared remote control circuit connected to the power supply circuit and the main control circuit respectively.

[0020] As one of the preferred embodiments of this utility model, the infrared remote control circuit includes a resistor R13, capacitors C17-18 and an infrared receiver IR1. One end of the resistor R13 is connected to the main control circuit and pin 1 of the infrared receiver IR1. The other end of the resistor R13 is connected to the power supply circuit, one end of capacitor C17, one end of capacitor C18 and pin 3 of the infrared receiver IR1. Pin 2 of the infrared receiver IR1, the other end of capacitor C17 and the other end of capacitor C18 are connected to the GND terminal.

[0021] As one of the preferred embodiments of this utility model, the irregularly shaped interface socket is configured as a LeEco A-type interface, a LeEco B-type interface, a Xiaomi C-type interface, or a Baofeng D-type interface.

[0022] In one of the preferred embodiments of this utility model, three HDMI interfaces are provided.

[0023] As one of the preferred embodiments of this utility model, the main control circuit includes a main control chip U2 with model number MS9601.

[0024] As one of the preferred embodiments of this utility model, the screen wake-up circuit includes a buck chip U1, a boost chip U3, a relay RLY, capacitors C1-3 and capacitor C5;

[0025] One end of pin 2 and one end of pin 4 of buck chip U1 are connected to the irregular interface socket through contact terminals. The other end of pin 2 of buck chip U1 is connected to the GND terminal through capacitor C1. The other end of pin 4 of buck chip U1 is connected to the GND terminal through capacitor C2. One end of pin 3 of buck chip U1 is connected to the power supply circuit and the main control circuit respectively. The other end of pin 3 of buck chip U1 is connected to the GND terminal through capacitor C3. Pin 1 of buck chip U1 is connected to the GND terminal.

[0026] Pin 1 of the boost chip U3 is connected to the power supply circuit and the main control circuit respectively. Pins 2 and 4 of the boost chip U3 are connected to the GND terminal. One end of pin 3 of the boost chip U3 is connected to the irregular interface socket through a contact terminal. The other end of pin 3 of the boost chip U3 is connected to the GND terminal through capacitor C5.

[0027] The contacts of relay RLY are connected to a constant voltage DC power supply, and the coil of relay RLY is connected to the power supply circuit and the GND terminal respectively.

[0028] As one of the preferred embodiments of this utility model, the storage circuit includes a storage chip U5, resistors R7-8 and capacitor C16. Pin 1 of the storage chip U5 is connected to one end of resistor R8, pin 2 of the storage chip U5 is connected to the GND terminal, pin 3 of the storage chip U5 is connected to one end of resistor R7 and the main control circuit respectively, pin 5 of the storage chip U5 is connected to one end of capacitor C16 and the GND terminal respectively, and pin 4 of the storage chip U5, the other end of resistor R7, the other end of resistor R8 and the other end of capacitor C16 are connected to the power supply circuit.

[0029] The beneficial effects of this utility model are as follows: A bidirectional conversion circuit for a non-standard interface socket in a multi-vendor split TV system includes a connector, an HDMI interface, and a control board. The connector has an adapter tongue that mates with the non-standard interface socket, and integrates several contact terminals internally. The control board is located inside the connector and has a power supply circuit, a main control circuit, a configurable screen wake-up circuit, and a storage circuit. Through the lossless connection between the adapter tongue and the non-standard interface socket connection cable, the control board and the main control circuit achieve: lossless bidirectional protocol signal conversion, directly converting the non-standard interface signal into three standard HDMI signals, simultaneously supporting input / output dual-mode functions; multi-device expansion capability, providing multiple HDMI signal input / output channels to meet the switching needs of multiple source devices; a manual modification-free design, eliminating the drawbacks of cable disassembly and soldering processes, eliminating dependence on manufacturer-specific parts, and significantly reducing usage costs; this circuit design overcomes the maintenance and parts shortage dilemma caused by manufacturer discontinuation in split TV systems, providing a fully compatible solution for split TV system equipment. Attached Figure Description

[0030] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0031] Figure 1 This is a block diagram of a bidirectional conversion circuit for a non-standard interface socket in a multi-vendor split-type television system.

[0032] Figure 2 The circuit diagram for the power supply circuit;

[0033] Figure 3 The circuit schematic of the main control circuit;

[0034] Figure 4 The circuit diagram for the screen wake-up circuit;

[0035] Figure 5 This is the circuit schematic of the storage circuit;

[0036] Figure 6 This is the circuit diagram of the button circuit;

[0037] Figure 7 This is the circuit diagram of an infrared remote control circuit.

[0038] Figure 8 Pin diagrams for four embodiments of the irregular-shaped interface socket;

[0039] Figure 9 This is a schematic diagram of the first embodiment of the irregular-shaped interface socket;

[0040] Figure 10 This is a style diagram of the second embodiment of the irregular-shaped interface socket;

[0041] Figure 11 This is a style diagram of the third embodiment of the irregular-shaped interface socket;

[0042] Figure 12 This is a style diagram of the fourth embodiment of the irregular-shaped interface socket;

[0043] Figure 13 Pin layout diagram for adapting to the first embodiment of the latch;

[0044] Figure 14 Pin layout diagram for adapting to the second embodiment of the latch;

[0045] Figure 15 Pin layout diagram for adapting to the third embodiment of the latch;

[0046] Figure 16 Pin layout diagram for the fourth embodiment of the latch;

[0047] Figure 17 This is a partial circuit diagram of an embodiment of a bidirectional conversion circuit for a non-standard interface socket in a multi-vendor split-type television system. Detailed Implementation

[0048] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0049] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0050] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0052] Reference Figures 1 to 17 A bidirectional conversion circuit for a non-standard interface socket of a multi-vendor split TV system includes a connector 10, an HDMI interface 20, and a control board 30. The connector 10 is provided with an adapter tongue 11 for the non-standard interface socket 40 to mate with, and a plurality of contact terminals 12 disposed within the adapter tongue 11. The non-standard interface socket 40 is connected to a first display device or a host. The HDMI interface 20 is disposed on the connector 10 and is used to connect to an HDMI signal source or a second display device. The control board 30 is disposed within the connector 10 and is provided with a power supply circuit 31, a main control circuit 32, a screen wake-up circuit 33, and a storage circuit 34.

[0053] Power supply circuit 31 is connected to an external power source;

[0054] The main control circuit 32 is connected to the power supply circuit 31, the contact terminal 12 and the HDMI interface 20 respectively;

[0055] The screen wake-up circuit 33 is connected to the power supply circuit 31, the irregular interface socket 40 and the main control circuit 32 respectively, and is used to wake up the first display device or the second display device.

[0056] The storage circuit 34 is connected to the power supply circuit 31, the irregular interface socket 40, the contact terminal 12 and the main control circuit 32 respectively, and is used to store the handshake data of the first display device or the second display device.

[0057] In this utility model:

[0058] ① The adapter tongue 11 on the connector 10 of the control board 30 is connected to the irregular interface socket 40 by plugging in. The adapter tongue 11 and its internal contact terminal 12 pins are designed according to the irregular interface socket 40 of different split TV systems. When the irregular interface socket 40 is plugged into the adapter tongue 11, the functional pins of the two are electrically corresponding one-to-one through the contact terminal 12. Thus, the pin signals of the irregular interface socket 40 are transmitted to the control board 30 through the contact terminal 12. The main control circuit 32 completes the bidirectional protocol conversion with the HDMI interface 20, and finally realizes the expansion of input / output functions.

[0059] Reference Figure 8 (a) is a pin diagram of the LeEco Type-A interface. After a series of processing steps by the main control circuit 32 on the control board 30, the 48-pin interface signal is finally converted to the 19 pins of the HDMI interface 20, enabling bidirectional signal transmission via the LeEco Type-A interface. Similarly, Figure 8 (c) LeEco Type B interface, Figure 8 The Xiaomi C-type in (d) is the same; it should be noted that, Figure 8 (b) The Storm D-type interface requires an external power supply of 24V to pins 43-45 and an external power supply of 12V to pins 40-42. Users need to connect the 24V and 12V power supplies externally (power supply circuit 31 does not provide power to this interface).

[0060] ② The bidirectional signal conversion function of the irregular interface socket 40: input / output function;

[0061] Input Function: The data cable of the irregular interface connector 40 accepts the input signal from the external HDMI interface 20, enabling lossless input of the HDMI interface 20 signal to the first display device connected to the irregular interface connector 40 in the split TV system. The specific process is as follows: After the physical connection described in ①, the HDMI interface 20 provides three input signals. Through the main control circuit 32, combined with the screen handshake data stored in the power supply circuit 31, screen wake-up circuit 33, and storage circuit 34, the handshake signal between the original host and the screen in the split TV system is simulated, allowing the first display device of the irregular interface connector 40 to be used directly. The main control circuit 32 provides the HDMI interface 20 with a maximum input resolution of 4K*2K (3840*2160), 60Hz high-definition resolution, with a total bandwidth of up to 11.94Gbps. It also provides a button circuit 50 and an infrared remote control circuit 60 for switching the various signals of the HDMI interface 20, eliminating the need for repeated plugging and unplugging operations when switching the HDMI interface 20 signals.

[0062] Output Function: The data cable of the irregular interface connector 40 outputs an HDMI signal to the HDMI interface 20, enabling lossless signal output from the host connected to the irregular interface connector 40 in the split TV system to the HDMI interface 20, thus achieving signal conversion from the host to a regular display. This solves the problem of the lack of a primary display device connected to the irregular interface connector 40. The specific process is as follows: After the host is connected to the connector 10 via the irregular interface connector 40 connecting cable, electrical correspondence is achieved through the contact terminals 12 on the adapter tongue 11. The electrical signal path of the irregular interface connector 40 is transmitted to the control board 30 via the contact terminals 12, and then the main control circuit 32 completes the signal conversion to the HDMI interface 20, realizing the output function.

[0063] ③ For the specific workflow of the input function, refer to Figure 8 (a) Taking LeEco's Type A 48-pin interface (corresponding to three screen models a1, a2, and a3) as an example for explanation:

[0064] Reference Figure 17 The LeEco Type A 48pin interface display device has three HDMI ports 20. The working conditions of the LeEco HDMI port 20 input signal, screen wake-up circuit 33 and storage circuit 34 stored EDID protocol handshake data.

[0065] The LeEco A1 display device with a Type A interface is connected to the device via HDMI interface 20, providing HDMI signals. Multiple signals are processed by the control chip U2 of the main control circuit 32 on the control board 30. The 5V voltage provided by pin 48 of the control chip U2 and the dual-channel stable power supply provided by the power supply circuit 31 are provided. The boost chip U3 in the screen wake-up circuit 33 outputs 12V to the 41-pin pin of the irregular interface socket 40 corresponding to the contact terminal 12, thereby driving the A1 display device to wake up. The control chip U2 transmits the input signal of HDMI interface 20 to the contact terminal 12 and finally to the irregular interface 40 to realize the image display of the first display device. The storage circuit 34 is used to store parameters such as resolution and refresh rate negotiated with the HDMI interface 20 signal device for EDID handshake negotiation. Only after the input device of HDMI interface 20 has successfully negotiated correctly can its HDMI image differential signal be correctly transmitted to the first display device. First, let's introduce the EDID handshake negotiation process without using the storage circuit 34: After the HDMI interface 20 is connected to the device, its HDMI signal is transmitted on the control board 30 to the control chip U2 of the main control circuit 32. The HPD pins (pins 17, 29, and 58) of the control chip U2 rise to 5V (refer to...). Figure 17If only one HDMI_IN signal is input, then only pin 29 will rise. The HPD pin 47 of the control chip U2 transmits the signal to the corresponding pin of the non-standard interface 40 via contact terminal 12, at which point the EDID handshake negotiation process begins. The first display device actively sends back its own EDID data via DDC bus communication to pins 61 and 62 (O_SCL, O_SDA) of the control chip U2. The control chip U2 then sends the received data back to pins 15 and 16 of the HDMI interface 20, as shown in the reference. Figure 17 Pins 15 and 16 of the three HDMI interfaces A, B, and C are connected. At this point, EDID negotiation is completed, and the differential image signal of the device connected to the HDMI interface 20 can be transmitted normally.

[0066] In actual implementation, not all of the aforementioned first display devices can correctly negotiate and return EDID information. For example, LeEco's B-type interface display devices cannot return their own EDID data, rendering the input function unusable. Therefore, a storage circuit 34 is set up, which is connected to both the power supply circuit 31 and the main control circuit 32. This storage circuit stores the common negotiation handshake data required by the first or second display device, including manufacturer information, image display size, color gamut settings, screen display frequency range, and other parameters, and allows for manual modification. After setting up the storage circuit 34, pins 61 and 62 of the control chip U2 in the main control circuit 32 will no longer communicate with the irregular interface socket 40 via DDC. Instead, they will be forced to communicate with pins 1 and 3 of the storage chip U5 via DDC, thereby returning the pre-written EDID handshake data to the HDMI20 interface input device, enabling the input device to transmit HDMI differential signals normally and allowing the first or second display device to display images correctly. The data in the storage circuit 34 can also be manually modified to forcibly lock the resolution of the input HDMI 20 device. One preferred embodiment is as follows: Since HDMI image signal resolution is backward compatible, if the highest resolution of the first or second display is 4K*2K (3840*2160), it is backward compatible with 1080P (1920*1080) and 720P (1280*720). By modifying the data in the storage circuit 34, the backward compatible 1080P and 720P data can be deleted, retaining only the highest 4K*2K resolution. This locks the resolution of the input HDMI 20 device at the highest resolution, achieving better image quality output and providing a better user experience. Furthermore, the specific data modification depends on the different input devices and the actual situation of the different first or second display devices.

[0067] Reference Figure 5The diagram below shows the schematic of storage circuit 34. Storage chip U5 is an erasable EEPROM. Its pins 1 and 3 are pulled up to 5V through resistors R7, R8, and 10K and connected to pins 61 and 62 (O_SCL, O_SDA) of control chip U2. Pins 2 and 5 of storage chip U5 are grounded. Pin 5 of storage chip U5 is connected to filter capacitor C16 for filtering, which improves the stability of storage circuit. EDID data is pre-written into storage chip U5, so that control chip U2 reads it during DDC communication and returns it to the corresponding SCL and SDA (DDC) pins of HDMI interface 20 input. The input device then knows the relevant parameters of the screen, so that the normal output image can be forcibly locked with parameters such as resolution and color range.

[0068] The LeEco A-type 48-pin interface display devices a2 and a3 operate in a similar manner to the aforementioned a1 first display device. The three key elements are: the HDMI interface 20 input signal, the screen wake-up circuit 33, and the EDID negotiation handshake data stored in the storage circuit 34. The difference lies in the use of a different chip in the screen wake-up circuit 33. (See [link]). Figure 4 For the a2 first display device, the power supply circuit 31 enables the U1 chip to output 3.3V, which is then output to the 42-pin pin of the irregular interface socket 40 corresponding to the contact terminal 12, thereby waking up the a2 display device. For the a3 first display device, an external 27V power supply is required. A relay RLY is designed on the control board 30. Through the 5V circuit of the power supply circuit 31, the signal input from the HDMI interface 20 is sent to the 48-pin pin of the control chip U2 in the main control circuit 32, which controls the relay RLY to close, allowing the 27V power supply to conduct to the contact terminal 12, and finally to the 46-48 pins of the LeTV A-type 48-pin irregular interface 40. The relay RLY is in the normally open state. The anti-embedded diode D5 is designed to prevent the reverse instantaneous voltage when the relay RLY closes and opens from affecting the main control circuit 32 and the 5V circuit of the power supply circuit 31, thus achieving a protection effect. Due to the relay, the external power supply is activated and the screen is lit only after a device is connected to the HDMI20 interface and enabled by the main control circuit 32. This achieves the effect of controlling the power supply to and from the screen based on whether the HDMI signal is input, thus realizing a linkage effect.

[0069] The screen connection process for LeEco's Type B interface, Xiaomi's Type C interface, and Baofeng's Type D interface is the same as that for LeEco's Type A interface. The difference is that the screen wake-up circuit 33 is not required. The rest of the process is the same and will not be described in detail here.

[0070] ④ In the main control circuit 32, the main control circuit 32 includes a control chip U2 and peripheral circuits. The control chip U2 is an HDMI 3-input 1-output switcher that conforms to the HDMI 1.4 standard. It features TMDS input equalization and low output jitter and can provide full-link switching of HDMI TMDS (4 channels per port), DDC (SCL / SDA) and HPD in a single-chip solution, simplifying system-level design in application scenarios with multiple HDMI input ports.

[0071] The control chip U2 provides 3 HDMI input ports and 1 HDMI output port (here, the irregular interface socket 40). The control chip U2 selects 1 of the 3 input signals (here, the HDMI interface 20) to generate a fully compatible HDMI signal output. There are two input signal switching mechanisms: manual and automatic. Manual switching is achieved by reading and writing the DDC instruction register, and automatic switching is achieved by the detection and switching circuit integrated inside the control chip U2. Both mechanisms can be effective simultaneously. When a certain input signal is selected for output, the TMDS input of that channel is connected to the TMDS channel of the output port through a 3-to-1 multiplexer. The DDC interface of the selected input port is connected to the DDC interface of the output port. The HPD signal state of the selected input port is consistent with the HPD signal state of the output port. The TMDS input and TMDS output of unused input ports are disconnected, the DDC channel is isolated, and the HPD output is kept at a low level.

[0072] 1. When a device is connected to HDMI interface 20, the control chip U2 controls pin 19 of the three connected HDMI signals (refer to...). Figure 17 Pin 19 (HPD definition) of the A, B, and C interfaces is used for detection. When a device is connected, this pin is pulled high. Pins 11, 55, and 26 of the control chip U2 detect the three HDMI signals respectively. After detection, the control chip U2 knows how many HDMI signals are connected. A high level indicates that one signal is connected, and DDC communication is performed to retrieve data from the storage circuit 34, i.e., EDID negotiation handshake data. Pins 61 and 62 of the control chip U2 communicate with it and return to the control chip U2. The three input DDC pins (1, 2, 3, 4, 63, 64) are used to confirm and handshake parameters such as HDMI resolution and color gamut, and then officially enter the HDMI image differential signal transmission stage. Finally, all the input HDMI signals are enabled by the control chip U2, which acts on the O_ pin of its output HDMI signal (pins 47, 48, 45, 44, 42, 41, 40, 39, 37, 36, 61, 62), and transmitted to the irregular interface socket 40 to realize the transmission of HDMI signals.

[0073] 2. When it is necessary to manually switch the signal of HDMI interface 20, two switching methods are provided: physical button circuit 50 and infrared remote control circuit 60. The physical button KEY1 of button circuit 50 can be pressed manually, which acts on pin 43 of control chip U2; the infrared remote control of infrared remote control circuit 60 can be used to act on pin 46 of control chip U2, and the switching can be achieved through the built-in program of control chip U2.

[0074] 3. When it is necessary to automatically switch the signal of HDMI interface 20, the control chip U2 detects which HDMI interface 20 is currently plugged in through the internally integrated HPD signal detection, and automatically switches to the signal of the channel with HPD high level. If one signal is connected, it switches to the input of that channel according to the high level. If multiple signals are connected, the control chip U2 enables the last high level signal according to the order in which the high level is generated.

[0075] 4. When each HDMI interface 20 receives an input signal, check whether pin 19 of each HDMI interface 20 outputs a high level to determine whether it is enabled by the control chip U2. Pin 19 is connected to an external LED to remind the user of the currently selected interface. When switching signal sources, the LED switches accordingly to indicate which signal is currently input.

[0076] ⑤Reference Figure 8 (a) Figure 9 and Figure 13 , Figure 8 (a) and Figure 9 LeEco has disclosed the pin definitions of its Type-A interface. Figure 13 The diagram showing the pin distribution of the adapter tongue 11 and its contact terminals 12 corresponding to the LeEco Type A interface is disclosed. Figure 8 (c) Figure 10 and Figure 14 , Figure 8 (c) and Figure 10 LeEco has disclosed the pin definitions of its Type B interface. Figure 14 The diagram showing the pin distribution of the adapter tongue 11 and its contact terminals 12 corresponding to the LeEco Type B interface is disclosed. Figure 8 (d) Figure 11 and Figure 15 , Figure 8 (d) and Figure 11 Xiaomi has publicly disclosed the pin definitions of its Type-C interface. Figure 15 The diagram showing the pin distribution of the adapter tongue 11 and its contact terminals 12 corresponding to the Xiaomi Type-C interface is disclosed. Figure 8 (b) Figure 12 and Figure 16 , Figure 8 (b) and Figure 12The pin definitions of the Storm D-type interface have been disclosed. Figure 16 The diagram shows the pin distribution of the adapter tongue 11 and the contact terminal 12 on it, corresponding to the Storm D-type interface.

[0077] Due to physical differences in the irregular-shaped interface sockets 40 from different manufacturers (including interface size, number, position, width, etc. of internal contact pins), this utility model adopts a directional design strategy for the adapter tongue 11 and contact terminal 12. Before the PCB circuit board of the control board 30 is manufactured, the relevant parameters of the contact pins (number of pins, pin spacing, pin length, width, width of the insertion slot, electrical function definition of the pins, etc.) inside the irregular-shaped interface socket 40 of the manufacturer's equipment are disassembled and measured. Based on the actual usage requirements, the adapter tongue 11 and contact terminal 12 are directionally designed on the control board 30. The parameters of the adapter tongue 11 match the original irregular-shaped interface socket 40, and the parameters of the contact terminal 12 match the internal contact pins inside the original irregular-shaped interface socket 40. Contact pins; after processing, a manufacturer's non-standard interface type corresponds to a control board 30 corresponding to a set of adapter tongues 11 and contact terminals 12; when the corresponding adapter tongue 11 is inserted into the corresponding non-standard interface socket 40, the contact terminals 12 on the adapter tongue 11 will contact the contact pins defined in the non-standard interface socket 40, thereby realizing the correct transmission of signals; it should be noted that the measurement of contact pin parameters in the non-standard interface socket 40 and the PCB orientation design adaptation are conventional means that can be implemented by those skilled in the art based on the physical differences of the interface. The core innovation of this utility model lies in the synergy between the bidirectional protocol conversion circuit (main control circuit 32) and the orientation design adaptation structure.

[0078] Furthermore, refer to Figure 8 (a) and Figure 13 This is a pin correspondence diagram between the LeEco Type-A interface and the first adapter tongue 11. Figure 13 The image above is a front view of the first adapter tongue 11. Figure 13 The following figure is a reverse view of the first adapter tongue 11. The contact terminals 12 between serial numbers 2-16 correspond to pins 2-16 of the LeEco A-type interface, the contact terminals 12 between serial numbers 30-33 correspond to pins 30-33 of the LeEco A-type interface, the contact terminals 12 between serial numbers 41-48 correspond to pins 41-48 of the LeEco A-type interface, and the remaining serial numbers correspond to pins on the LeEco A-type interface that are not related to this utility model patent.

[0079] Reference Figure 8 (c) and Figure 14 This is a pinout diagram showing the correspondence between the LeEco Type B interface and the second adapter tongue 11. Figure 14 The image above is a front view of the second adapter tongue 11. Figure 14The following figure is a reverse view of the second adapter tongue 11. The contact terminals 12 between serial numbers 1-11 correspond to pins 1-11 of the LeEco B-type interface, the contact terminals 12 between serial numbers 25-34 correspond to pins 25-34 of the LeEco B-type interface, and the remaining serial numbers correspond to pins on the LeEco B-type interface that are not related to this utility model patent.

[0080] Reference Figure 8 (d) and Figure 15 This is a pinout diagram showing the correspondence between the Xiaomi Type-C interface and the third adapter tongue 11. Figure 15 The image above is a front view of the third adapter tongue 11. Figure 15 The following figure is a reverse view of the third adapter tongue 11. The contact terminals 12 between serial numbers 2-18 correspond to pins 2-18 of the Xiaomi C-type interface, the contact terminals 12 between serial numbers 1-19 correspond to pins 1-19 of the Xiaomi C-type interface, and the remaining serial numbers correspond to pins on the Xiaomi C-type interface that are not related to this utility model patent.

[0081] Reference Figure 8 (b) and Figure 16 This is a pin correspondence diagram between the Storm D-type interface and the fourth adapter tongue 11, i.e. Figure 16 The image above is a front view of the fourth adapter tongue 11. Figure 16 The image below shows the reverse side of the fourth adapter tongue 11. Contact terminals 12 numbered 2-19 correspond to pins 2-19 of the Storm D-type interface, and contact terminals 12 numbered 37-48 correspond to pins 37-48 of the Storm D-type interface. The remaining numbers correspond to pins on the Storm D-type interface that are unrelated to this utility model patent.

[0082] When pins with the same definition are in contact with each other, bidirectional and correct signal transmission can be achieved.

[0083] ⑥ The advantages of this utility model are:

[0084] 1. Non-destructive and easy-to-use connection, eliminating the difficulty of cable cutting and modification: Through the plug-in connection of the adapter tongue 11 and the irregular interface socket 40, lossless bidirectional signal conversion between the first display device / host and the HDMI signal source / second display device is achieved. This design: ① completely avoids cable cutting and soldering, eliminating the processing difficulty of existing solutions; ② eliminates the need to purchase original factory-specific accessories, significantly reducing usage and maintenance costs.

[0085] 2. High-quality signal transmission and reversible recovery operation guarantee: The bidirectional conversion circuit meets the high bandwidth requirements of HDMI differential signals. Key innovations include: ① End-to-end signal stability design: The circuit board design of the control board 30, main control circuit 32, contact terminal 12 and other circuit boards strictly follows the HDMI signal equal length impedance consistency standard; filter capacitors, diodes and other components ensure long-term circuit stability and comply with the HDMI 1.4a specification; ② Physically non-destructive reversible operation: After the adapter tongue 11 is pulled out, the special irregular interface cable is restored to its original state, completely solving the irreversible damage caused by modification.

[0086] 3. Multi-device switching and expansion capabilities: ① Three-channel HDMI input support: Multiple signal source input channels are integrated through the U2 control chip solution; ② Intelligent signal management: The storage circuit 34 stores EDID handshake data; the infrared remote control circuit 60 and the button circuit 50 realize the switching of input sources to meet the needs of multi-device switching.

[0087] 4. Programmable optimization of image parameters: The storage chip U5 in the storage circuit 34 is pre-loaded with editable EDID data, which is dynamically fed back to the HDMI interface 20 by the main control circuit 32, forcibly setting parameters such as resolution, color range, and frequency range of the first or second display device, so as to achieve precise optimization of the viewing experience when the split TV system is used independently.

[0088] 5. Modular and compatible design for quick adaptation to different manufacturers: ① Integrated functional partition: The control board 30 is equipped with corresponding connectors 10, adapter tongues 11, and contact terminals 12 from different manufacturers according to actual usage requirements; ② Flexible configuration of wake-up circuit: For the wake-up requirements of different manufacturers' split TV systems, the wake-up circuit 33 component pads are reserved, and compatibility can be achieved by simply soldering the corresponding components.

[0089] 6. Universal application across all scenarios, widely solving legacy issues in the split-screen TV market: ① Activating existing equipment: Supports independent use of irregularly shaped interface screens without a host or irregularly shaped interface host without a screen; ② Universal coverage: Compatible with irregularly shaped interface devices from the vast majority of manufacturers.

[0090] 7. Original power supply mode retained: The original power supply interface is brought out through the adapter tongue 11 and contact terminal 12: ① External DC power supply is directly provided without disassembling the display device or host; ② The integrity of the device is maintained and the power supply design specifications of the manufacturer are strictly followed.

[0091] 8. The bidirectional conversion circuit adopts a redundant design: In the power supply circuit 31, the internal pin 18 of the HDMI interface 20 is used for power supply, and an external backup power supply is provided for the power supply circuit 31, improving the stability of the control board 30 and the main control circuit 32. Two switching modes are provided for switching the various signals of the HDMI interface 20: button circuit 50 and infrared remote control circuit 60, improving user convenience.

[0092] A bidirectional conversion circuit for a non-standard interface socket of a multi-manufacturer split TV system also includes a button circuit 50 connected to the power supply circuit 31 and the main control circuit 32 respectively. As a preferred embodiment of the button circuit 50, the button circuit 50 includes a resistor R6, a capacitor C9 and a button KEY1. One end of the resistor R6 is connected to the power supply circuit 31, and the other end of the resistor R6 is connected to the main control circuit 32, one end of the capacitor C9 and one end of the button KEY1 respectively. The other end of the button KEY1 and the other end of the capacitor C9 are connected to the GND terminal.

[0093] A bidirectional conversion circuit for a non-standard interface socket of a multi-manufacturer split TV system also includes an infrared remote control circuit 60 connected to the power supply circuit 31 and the main control circuit 32 respectively. As a preferred embodiment of the infrared remote control circuit 60, the infrared remote control circuit 60 includes a resistor R13, capacitors C17-18 and an infrared receiver IR1. One end of the resistor R13 is connected to the main control circuit 32 and pin 1 of the infrared receiver IR1. The other end of the resistor R13 is connected to the power supply circuit 31, one end of capacitor C17, one end of capacitor C18 and pin 3 of the infrared receiver IR1 respectively. Pin 2 of the infrared receiver IR1, the other end of capacitor C17 and the other end of capacitor C18 are connected to the GND terminal.

[0094] Preferably, the irregularly shaped interface socket 40 is configured as a LeEco A-type interface, a LeEco B-type interface, a Xiaomi C-type interface, or a Baofeng D-type interface.

[0095] As a preferred embodiment of the screen wake-up circuit 33, the screen wake-up circuit 33 includes a buck chip U1, a boost chip U3, a relay RLY, capacitors C1-3 and capacitor C5;

[0096] One end of pin 2 and one end of pin 4 of buck chip U1 are connected to the irregular interface socket 40 through contact terminal 12 for waking up the first display device or the second display device; the other end of pin 2 of buck chip U1 is connected to the GND terminal through capacitor C1, the other end of pin 4 of buck chip U1 is connected to the GND terminal through capacitor C2, one end of pin 3 of buck chip U1 is connected to the power supply circuit 31 and the main control circuit 32 respectively for providing 5V input power; the other end of pin 3 of buck chip U1 is connected to the GND terminal through capacitor C3, and pin 1 of buck chip U1 is connected to the GND terminal; wherein, the buck chip U1 is model AMS1117, and capacitors C1, C2, and C3 are used to improve the circuit stability of buck chip U1;

[0097] Pin 1 of the boost chip U3 is connected to the power supply circuit 31 and the main control circuit 32 respectively. Pins 2 and 4 of the boost chip U3 are connected to the GND terminal. One end of pin 3 of the boost chip U3 is connected to the irregular interface socket 40 through the contact terminal 12, which is used to wake up the first display device or the second display device. The other end of pin 3 of the boost chip U3 is connected to the GND terminal through capacitor C5. Capacitor C5 is used to improve the circuit stability of the boost chip U3.

[0098] The contacts of relay RLY are connected to a constant voltage DC power supply, and the coil of relay RLY is connected to the power supply circuit 31 and the GND terminal respectively. The main control circuit 32 controls whether to provide 5V to control the closing and opening of relay RLY. When the relay is in the normally open state, the main control circuit 32 controls whether the external power supply is output to the contact terminal 12 and finally transmitted to the irregular interface socket 40.

[0099] In a preferred embodiment of the storage circuit 34, the storage circuit 34 includes a storage chip U5, resistors R7-8, and a capacitor C16. The storage chip U5 is an electrically erasable programmable memory chip (EEPROM), which can retain its information even when power is lost and can be manually written to modify data. Pin 1 of the storage chip U5 is connected to pin 61 of the main control circuit 32 and one end of resistor R7. The other end of resistor R7 is connected to the power supply circuit 31 to provide 5V. Pin 3 of the storage chip U5 is connected to pin 62 of the main control circuit 32 and one end of resistor R8. The other end of resistor R8 is connected to the power supply circuit 31 to provide 5V. Pin 5 of the storage chip U5 is connected to one end of capacitor C16 and the GND terminal. The other end of capacitor C16 is connected to the power supply circuit 31 to provide 5V. Pin 2 of the storage chip U5 is connected to the GND terminal.

[0100] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A bidirectional conversion circuit for an irregularly shaped interface socket in a multi-manufacturer split-type television system, characterized in that: The system includes a connector (10), an HDMI interface (20), and a control board (30). The connector (10) is provided with an adapter tongue (11) for mating with a non-standard interface socket (40) and a plurality of contact terminals (12) disposed within the adapter tongue (11). The non-standard interface socket (40) is connected to a first display device or a host. The HDMI interface (20) is disposed on the connector (10) and is used to connect an HDMI signal source or a second display device. The control board (30) is disposed within the connector (10) and is provided with a power supply circuit (31), a main control circuit (32), a screen wake-up circuit (33), and a storage circuit (34). The power supply circuit (31) is connected to an external power source; The main control circuit (32) is connected to the power supply circuit (31), the contact terminal (12) and the HDMI interface (20) respectively; The screen wake-up circuit (33) is connected to the power supply circuit (31), the irregular interface socket (40), the contact terminal (12) and the main control circuit (32) respectively, and is used to wake up the first display device or the second display device; The storage circuit (34) is connected to the power supply circuit (31) and the main control circuit (32) respectively, and is used to store the handshake data of the first display device or the second display device.

2. The bidirectional conversion circuit for a non-standard interface socket in a multi-manufacturer split-type television system according to claim 1, characterized in that: It also includes a button circuit (50) that is connected to the power supply circuit (31) and the main control circuit (32) respectively.

3. The bidirectional conversion circuit for a non-standard interface socket in a multi-manufacturer split-type television system according to claim 2, characterized in that: The button circuit (50) includes a resistor R6, a capacitor C9 and a button KEY1. One end of the resistor R6 is connected to the power supply circuit (31), and the other end of the resistor R6 is connected to the main control circuit (32), one end of the capacitor C9 and one end of the button KEY1. The other end of the button KEY1 and the other end of the capacitor C9 are connected to the GND terminal.

4. The bidirectional conversion circuit for a non-standard interface socket in a multi-manufacturer split-type television system according to claim 1, characterized in that: It also includes an infrared remote control circuit (60) that is connected to the power supply circuit (31) and the main control circuit (32) respectively.

5. The bidirectional conversion circuit for a non-standard interface socket in a multi-manufacturer split-type television system according to claim 4, characterized in that: The infrared remote control circuit (60) includes a resistor R13, capacitors C17-18 and an infrared receiver IR1. One end of the resistor R13 is connected to the main control circuit (32) and pin 1 of the infrared receiver IR1. The other end of the resistor R13 is connected to the power supply circuit (31), one end of capacitor C17, one end of capacitor C18 and pin 3 of the infrared receiver IR1. Pin 2 of the infrared receiver IR1, the other end of capacitor C17 and the other end of capacitor C18 are connected to the GND terminal.

6. The bidirectional conversion circuit for a non-standard interface socket in a multi-manufacturer split-type television system according to claim 1, characterized in that: The irregularly shaped interface socket (40) is configured as a LeTV A-type interface, a LeTV B-type interface, a Xiaomi C-type interface, or a Baofeng D-type interface.

7. The bidirectional conversion circuit for a non-standard interface socket in a multi-manufacturer split-type television system according to claim 1, characterized in that: The HDMI interface (20) is configured to have 3 ports.

8. The bidirectional conversion circuit for a non-standard interface socket in a multi-manufacturer split-type television system according to claim 1, characterized in that: The main control circuit (32) includes a main control chip U2 with model number MS9601.

9. The bidirectional conversion circuit for a non-standard interface socket in a multi-manufacturer split-type television system according to claim 1, characterized in that: The screen wake-up circuit (33) includes a buck chip U1, a boost chip U3, a relay RLY, capacitors C1-3 and C5; One end of pin 2 and one end of pin 4 of buck chip U1 are connected to the irregular interface socket (40) through contact terminal (12). The other end of pin 2 of buck chip U1 is connected to the GND terminal through capacitor C1. The other end of pin 4 of buck chip U1 is connected to the GND terminal through capacitor C2. One end of pin 3 of buck chip U1 is connected to the power supply circuit (31) and the main control circuit (32) respectively. The other end of pin 3 of buck chip U1 is connected to the GND terminal through capacitor C3. Pin 1 of buck chip U1 is connected to the GND terminal. The boost chip U3 pin 1 is connected to the power supply circuit (31) and the main control circuit (32) respectively. The boost chip U3 pin 2 and pin 4 are connected to the GND terminal. One end of the boost chip U3 pin 3 is connected to the irregular interface socket (40) through the contact terminal (12). The other end of the boost chip U3 pin 3 is connected to the GND terminal through the capacitor C5. The contacts of relay RLY are connected to a constant voltage DC power supply, and the coil of relay RLY is connected to the power supply circuit (31) and the GND terminal respectively.

10. The bidirectional conversion circuit for a non-standard interface socket in a multi-manufacturer split-type television system according to claim 1, characterized in that: The storage circuit (34) includes a storage chip U5, resistors R7-8 and capacitor C16. Pin 1 of the storage chip U5 is connected to one end of resistor R8, pin 2 of the storage chip U5 is connected to GND, pin 3 of the storage chip U5 is connected to one end of resistor R7 and the main control circuit (32), pin 5 of the storage chip U5 is connected to one end of capacitor C16 and GND, and pin 4 of the storage chip U5, the other end of resistor R7, the other end of resistor R8 and the other end of capacitor C16 are connected to the power supply circuit (31).

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