HDMI and displayport bidirectional conversion circuit

Abstract

The utility model relates to electronic circuit technical field, concretely for HDMI and displayport two -way conversion circuit, include: automatic identification module, power supply switching circuit, EDID switching circuit, high -speed signal switching circuit, video signal conversion circuit, port connection circuit. The utility model discloses through automatic identification module can independently identify the interface type of signal source and display device, realizes the two -way conversion of HDMI and DP signal, and a conversion line can be dual -purpose, and convenient to use, and EDID switching circuit has guaranteed the correct communication of signal source and display device, and high -speed signal switching circuit and video signal conversion circuit have guaranteed the stable transmission and format conversion of video signal, the utility model supports long -distance signal transmission and solves the interface incompatible, user does not know the conversion direction problem in the prior art, has extensive applicability and convenience, can satisfy the equipment connection demand under different scenes.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, specifically to a bidirectional conversion circuit between HDMI and DisplayPort. Background Technology

[0002] With the widespread adoption of high-definition display technology, HDMI (High-Definition Multimedia Interface) and DP (DisplayPort) have become the mainstream audio and video transmission interfaces. HDMI is widely used in consumer electronic devices such as televisions, projectors, and Blu-ray players, while DP dominates in professional fields such as computers and monitors. However, when users need to connect an HDMI signal source (such as a game console) to a DP monitor, or a DP signal source (such as a graphics card) to an HDMI TV, direct communication is impossible due to incompatible interface protocols.

[0003] Existing converters have the following drawbacks:

[0004] Unidirectional transmission limitation: Products on the market only support single-direction conversion (such as HDMI to DP or DP to HDMI), and two converters need to be purchased to meet bidirectional requirements;

[0005] Manual switching is cumbersome: It cannot automatically identify the interface type and requires manual setting of the conversion mode, which is inconvenient. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a bidirectional conversion circuit for HDMI and DisplayPort. By automatically identifying the interface type and intelligently switching the power supply and signal conversion circuits, it enables bidirectional transparent transmission of HDMI and DP signals, solving the problem of connecting cross-interface devices and improving ease of use and adaptability to various scenarios.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] The HDMI to DisplayPort bidirectional conversion circuit includes:

[0009] The automatic identification module uses an MCU to detect whether the signal source and the display device port are HDMI or DP, and outputs the detection signal to the power supply switching circuit.

[0010] The power supply switching circuit includes chips U4, U5 and U10. When HDMI to DP conversion is detected, chips U4 and U5 are enabled to provide operating voltage, and when DP to HDMI conversion is detected, chip U10 is enabled to provide display recognition voltage.

[0011] The EDID switching circuit is used to identify and switch the extended display identifier data of the display device to achieve parameter matching between the signal source and the display device.

[0012] The high-speed signal switching circuit uses signal switching elements to switch the path between HDMI and DP high-speed video signals;

[0013] Video signal conversion circuitry, including conversion circuitry for converting HDMI signal sources into DP display formats;

[0014] The port connection circuit includes HDMI input / output ports and DP input / output ports, which are used to physically connect the signal source and the display device.

[0015] Preferably, the automatic identification module identifies the interface type by detecting the HDMI hot-plug signal and the DP auxiliary channel signal.

[0016] Preferably, in the power supply switching circuit, the U4 chip and the U5 chip output 12V and 3.3V voltages, respectively, and the U10 chip outputs 5V voltage.

[0017] Preferably, the EDID switching circuit includes an EDID memory, which is accessed via I... 2 The C bus communicates with the signal source.

[0018] Preferably, the high-speed signal switching circuit includes a switching path for transmitting HDMI™DS signals and DP main link signals, which is controlled and selected by the MCU.

[0019] Preferably, the video signal conversion circuit uses a TPAA01 chip, whose pins include:

[0020] The power supply pins DVDD33 and DVDD12 are connected to 3.3V and 12V power supplies, respectively.

[0021] The signal pins HDMI_D0_P / N and DP_TX0_P / N are used to connect HDMI and DP video signals.

[0022] The control pins GPIO13 / 14 receive the MCU's direction conversion command.

[0023] In the port connection circuit:

[0024] The HDMI interface is of the Type A standard and includes 19 pins for HPD, SCL / SDA, TMDS signals, etc.

[0025] The DP interface supports the DisplayPort standard and includes pins such as AUX_P / N and TX differential pairs.

[0026] Supports bidirectional signal conversion between HDMI signal sources and DP displays, and between DP signal sources and HDMI displays.

[0027] Compared with the prior art, the beneficial effects of this utility model are:

[0028] This invention utilizes an automatic identification module to autonomously identify the interface types of the signal source and display device, enabling bidirectional conversion between HDMI and DP signals. A single adapter cable can serve two purposes, offering convenient use. The EDID switching circuit ensures correct communication between the signal source and the display device, while the high-speed signal switching circuit and video signal conversion circuit guarantee stable video signal transmission and format conversion. Furthermore, this invention supports long-distance signal transmission, solving the problems of interface incompatibility and short transmission distance in existing technologies. It boasts wide applicability and convenience, meeting the device connection needs of various scenarios.

[0029] This invention achieves bidirectional conversion between HDMI and DP signals, automatic identification of interface types, and stable long-distance transmission through the coordinated operation of various circuit modules, demonstrating significant technical advantages and practical value. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the automatic identification circuit of this utility model;

[0031] Figure 2 This is a schematic diagram of the power supply switching circuit of this utility model;

[0032] Figure 3 This is a schematic diagram of the EDID switching circuit of this utility model;

[0033] Figure 4 This is a schematic diagram of the high-speed signal switching circuit of this utility model;

[0034] Figure 5 This is a schematic diagram of the video signal conversion circuit of this utility model;

[0035] Figure 6 This is a schematic diagram of the port connection circuit of this utility model. Figure 1 ;

[0036] Figure 7 This is a schematic diagram of the port connection circuit of this utility model. Figure 2 . Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] Example 1:

[0039] like Figure 1-7 As shown, the HDMI to DisplayPort bidirectional conversion circuit includes an automatic identification module, a power supply switching circuit, an EDID switching circuit, a high-speed signal switching circuit, a video signal conversion circuit, and a port connection circuit.

[0040] like Figure 1 As shown, the automatic identification module uses an MCU (Microcontroller Unit) to detect and identify whether the interface type of the signal source and the display is HDMI or DP, and transmits the detection signal to the relevant circuits to provide the conditions for their operation. The automatic identification module detects the interface type of the signal source and the display through the MCU. When the signal source is an HDMI interface, the MCU detects the specific signal characteristics of HDMI; when the signal source is a DP interface, it detects the specific signal characteristics of DP, and transmits the detection result to the power supply switching circuit and other related circuits.

[0041] like Figure 2 As shown, the power supply switching circuit switches power according to the detection results of the automatic identification module. When converting from HDMI to DP, chips U4 and U5 are enabled, providing operating voltage for the video signal conversion circuit, etc.; when converting from DP to HDMI, chip U10 is enabled, providing the voltage required for display recognition. The power supply switching circuit is connected to the automatic identification module and includes chips U4, U5, and U10. When the automatic identification module detects an HDMI to DP conversion, it enables chips U4 and U5, providing operating voltage for subsequent chips; when it detects a DP to HDMI conversion, it enables chip U10, providing the display recognition voltage, thus achieving intelligent power switching.

[0042] like Figure 3 As shown, the EDID switching circuit, through its connection with the display device, acquires the EDID information of the display device and transmits it to the signal source. This allows the signal source to adjust the output signal according to the parameters of the display device, achieving correct display. The EDID switching circuit is used to identify and switch the Extended Display Identifier (EDID) data of the display device, ensuring correct communication between the signal source and the display device, acquiring parameter information such as the display device's resolution and refresh rate, and guaranteeing the correct display of the video signal.

[0043] like Figure 4 As shown, after receiving a signal from the automatic identification module, the high-speed signal switching circuit switches the signal transmission path, transmitting the high-speed video signal from the signal source to the corresponding display device interface, ensuring stable signal transmission. The high-speed signal switching circuit is used to switch and transmit high-speed video signals between HDMI and DP interfaces, employing efficient signal switching components to ensure stable video signal transmission and reduce signal attenuation and distortion.

[0044] like Figure 5As shown, the video signal conversion circuit converts HDMI video signals to DP format during HDMI to DP conversion, and vice versa, thus achieving signal format conversion. The video signal conversion circuit includes a circuit that converts HDMI signal sources to DP display format. Through specific chip and circuit design, it realizes the format conversion between HDMI and DP signals, enabling signals from different interfaces to be displayed correctly on their corresponding display devices.

[0045] like Figure 6 , Figure 7 As shown, the HDMI and DP ports of the port connection circuit are used to connect the signal source and the display device, respectively. High-quality interface components and circuit connections ensure reliable signal input and output. The port connection circuit includes HDMI input / output ports and DP input / output ports to achieve physical connections with the signal source and display device. The ports utilize high-quality interface components to ensure reliable signal transmission.

[0046] In terms of chip applications, chips such as TPAA01 are used. Some pins of the TPAA01 chip are connected to video signals, power supply, etc. For example, its specific pins are used to receive and process HDMI or DP video signals. Through connection with other components, the signal conversion and transmission functions are realized.

[0047] Example 2:

[0048] like Figure 1 As shown, the automatic recognition module:

[0049] A microcontroller unit (MCU) is used to detect the interface type (HDMI or DP) between the signal source and the display device in real time. By monitoring the HDMI hot-plug signal (HPD) and the DP auxiliary channel signal (AUXChannel), the MCU automatically determines the conversion direction (HDMI→DP or DP→HDMI) and triggers the corresponding circuit to work.

[0050] like Figure 2 As shown, the power switching circuit includes:

[0051] HDMI to DP mode: MCU enable chips U4 and U5 output 12V / 3.3V voltage to power the DP signal conversion circuit;

[0052] DP to HDMI mode: MCU enable chip U10 outputs 5V voltage to power the HDMI recognition circuit.

[0053] like Figure 3 As shown, the EDID switching circuit:

[0054] The MCU chip handles the EDID switching circuit, dynamically switching EDID data according to the conversion direction.

[0055] When an HDMI signal source is connected to a DP display, the converter sends the EDID information (resolution, refresh rate, etc.) of the DP display back to the signal source.

[0056] When a DP signal source is connected to an HDMI monitor, the EDID information of the HDMI monitor is fed back to ensure that the signal source is compatible with the display device.

[0057] like Figure 4 As shown, the high-speed signal conversion circuit is as follows:

[0058] High-speed switching chips (such as TI's TS3USB30) are used to switch video signals, supporting 4K@60Hz high-definition signal transmission. The circuit includes:

[0059] HDMI signal path: Transmits TMDS signals (D0 / D1 / D2 differential pairs, clock signal);

[0060] DP signal path: Transmits DisplayPort™DS signals (TX0 / TX1 / TX2 / TX3 differential pairs);

[0061] The MCU controls the switching chip to select the corresponding path, achieving lossless signal switching (see schematic diagram). Figure 4 ).

[0062] like Figure 5 As shown, the video format conversion circuit is as follows:

[0063] The core chip uses TPAA01 (or equivalent) to realize the protocol conversion between HDMI and DP signals;

[0064] Also includes:

[0065] HDMI to DP: Converts the TMDS signal of HDMI to the AUX+ main link signal of DP, supporting HDCP decryption;

[0066] DP to HDMI: Converts the DP main link signal to the HDMI TMDS signal, compatible with the CEC control protocol.

[0067] The pin connections for TPAA01 are as follows:

[0068] Power supply pins: DVDD33 (3.3V) and DVDD12 (12V) are connected to the power switching circuit respectively;

[0069] Signal pins: HDMI_D0_P / N, DP_TX0_P / N, etc., connect to high-speed signal paths;

[0070] The conversion instruction is processed by the MCU, which then determines the conversion direction based on the data (see diagram). Figure 5 ).

[0071] like Figure 6 , 7 As shown, the port connection component includes:

[0072] HDMI interface: Supports Type A standard, including 19 pins (HPD, SCL / SDA, TMDS signals, etc.);

[0073] DP interface: Supports DisplayPort 1.4 standard, including 20 pins (AUX_P / N, TX / RX differential pairs, etc.);

[0074] The interface uses a gold-plating process to improve anti-interference capabilities and extend plug-in / plug-out lifespan.

[0075] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bidirectional conversion circuit for HDMI and DisplayPort, characterized in that, include: The automatic identification module uses an MCU to detect whether the signal source and the display device port are HDMI or DP, and outputs the detection signal to the power supply switching circuit. The power supply switching circuit includes chips U4, U5 and U10. When HDMI to DP is detected, chips U4 and U5 are enabled to provide operating voltage, and when DP to HDMI is detected, chip U10 is enabled to provide display recognition voltage. The EDID switching circuit is used to identify and switch the extended display identifier data of the display device to achieve parameter matching between the signal source and the display device. The high-speed signal switching circuit uses signal switching elements to switch the path between HDMI and DP high-speed video signals; Video signal conversion circuitry, including conversion circuitry for converting HDMI signal sources into DP display formats; The port connection circuit includes HDMI input / output ports and DP input / output ports, which are used to physically connect the signal source and the display device.

2. The HDMI to DisplayPort bidirectional conversion circuit according to claim 1, characterized in that, The automatic identification module identifies the interface type by detecting the HDMI hot-plug signal and the DP auxiliary channel signal.

3. The HDMI to DisplayPort bidirectional conversion circuit according to claim 1, characterized in that, In the power supply switching circuit, chips U4 and U5 output 12V and 3.3V voltages, respectively, while chip U10 outputs 5V voltage.

4. The HDMI to DisplayPort bidirectional conversion circuit according to claim 1, characterized in that, The EDID switching circuit includes an EDID memory, which is connected via I... 2 The C bus communicates with the signal source.

5. The HDMI to DisplayPort bidirectional conversion circuit according to claim 1, characterized in that, The high-speed signal switching circuit includes a switching path for transmitting HDMI™DS signals and DP main link signals, which is controlled and selected by the MCU.

6. The HDMI to DisplayPort bidirectional conversion circuit according to claim 1, characterized in that, The video signal conversion circuit uses the TPAA01 chip, whose pins include: The power supply pins DVDD33 and DVDD12 are connected to 3.3V and 12V power supplies, respectively. The signal pins HDMI_D0_P / N and DP_TX0_P / N are used to connect HDMI and DP video signals. The control pin, GPI01 / 19, receives the MCU's direction conversion command.

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