CN220896745U - Signal conversion circuit for converting HDMI high-definition video signals by using USBC - Google Patents
Signal conversion circuit for converting HDMI high-definition video signals by using USBC Download PDFInfo
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- CN220896745U CN220896745U CN202322675632.5U CN202322675632U CN220896745U CN 220896745 U CN220896745 U CN 220896745U CN 202322675632 U CN202322675632 U CN 202322675632U CN 220896745 U CN220896745 U CN 220896745U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model provides a signal conversion circuit for converting an HDMI high-definition video signal by using USBC, and belongs to the technical field of video signal processing. The signal conversion circuit for converting the HDMI high-definition video signals by using the USBC comprises an USB Type-C interface module supporting a DP protocol, a main control video signal conversion module and an HDMI interface module, wherein the input end of the main control video signal conversion module is connected with the output end of the USB Type-C interface module, receives the DP video signals, the output end of the main control video signal conversion module is connected with the HDMI interface, outputs the HDMI high-definition video signals, and the USB Type-C interface module is provided with four groups of signal differential pair data transmission channels for transmitting DP signal data streams and a pair of auxiliary signal differential pair channels for realizing communication handshake of the video protocol. The beneficial effects of the utility model are as follows: the signal can be transmitted more stably, and the cost efficiency is high.
Description
Technical Field
The utility model relates to the technical field of video signal processing, in particular to a signal conversion circuit for converting a high-definition video signal of an HDMI by using a USBC.
Background
DisplayPort (DP) is a high-definition digital display interface standard, which can be connected with a computer and a display, and also can be connected with a computer and a home theater, especially, 4 HBR3 high-speed channels are provided between a display adapter and the display because of supporting signal transmission of 8K resolution, and the theoretical bandwidth of the 4 channels reaches 32.4Gbps, which is enough to support 4K120Hz output of 10-bit colors, and also can support 8K 60Hz output.
The USBC interface is also called as a USBType-C interface, is a mainstream communication interface in the market, and is widely applied to electronic devices in various industries, if DP video signals can be transmitted through the USB interface and the processing requirement of DP1.4 high-speed video streams is met, the application range will be greatly expanded, so that it is very necessary to develop a DP video signal conversion HDMI high-definition video signal converter based on the USB Type-C interface.
Disclosure of utility model
In order to solve the problems in the prior art, the utility model provides a signal conversion circuit for converting an HDMI high-definition video signal by using USBC.
The utility model discloses a signal conversion circuit for converting HDMI high-definition video signals by using USBC, which comprises an USB Type-C interface module supporting a DP protocol, a main control video signal conversion module and an HDMI interface module, wherein the input end of the main control video signal conversion module is connected with the output end of the USB Type-C interface module, receives the DP video signals, the output end of the main control video signal conversion module is connected with the HDMI interface, outputs HDMI high-definition video signals, and the USBType-C interface module is provided with four groups of signal differential pair data transmission channels for transmitting DP signal data streams and a pair of auxiliary signal differential pair channels for realizing video protocol communication handshake.
Further, the USB Type-C interface module comprises a USB Type-C interface, the USB Type-C interface is provided with 8 signal pins which are respectively connected with four groups of signal differential pair data transmission channels, a pair of protocol pins which are connected with the auxiliary signal differential pair channels, and a VBUS pin which supplies power for the whole circuit, and the four groups of signal differential pair data transmission channels are also respectively provided with a coupling unit.
Further, the coupling unit is a coupling capacitor connected in series to the signal line of each signal differential pair data transmission channel, one signal line of the auxiliary signal differential pair channel is connected with a pull-up resistor which is pulled up to a power supply, and the other signal line is connected with a grounding resistor.
Further, the USB Type-C interface power supply comprises a power supply module connected with the USB Type-C interface power supply output end, wherein the power supply module comprises a first conversion voltage conversion branch and a second voltage conversion branch, and the first voltage conversion branch reduces the 5V voltage of the USB Type-C interface to 1.2V to provide core working voltage for a chip; the second voltage conversion branch circuit is used for converting the 5V voltage of the USB Type-C interface into 3.3V voltage, working voltage is provided for the peripheral IO port of the main control chip of the main control video signal conversion module, and a diode D2 for preventing serial connection between the 5V power supply and the 3.3V power supply is arranged at the power supply input end of the second voltage conversion branch circuit.
Further, the master control video signal conversion module comprises a master control chip U1, a reset chip U2 and a storage chip U3 which are respectively connected with the master control chip U1, wherein the master control chip U1 adopts a GSV6201 master control chip.
Further, the HDMI interface module includes an HDMI interface, where the HDMI interface is provided with four sets of signal differential pairs for receiving the output signals of the master control video signal conversion module, and a set of HDMIDDC display data channels for video protocol communication between the handshake source end and the device end.
Further, one end of the HDMIDDC display data channel is connected to the master control video signal conversion module, the other end is connected to the pin 15 and the pin 16 of the HDMI interface, two data lines of the HDMIDDC display data channel are respectively connected to a resistor R4 and a resistor R5, and the other ends of the resistors R4 and R5 are connected to a power supply.
Compared with the prior art, the utility model can realize the high-speed signal transmission of the DP1.4 high-definition digital display interface standard through the USB Type-C interface;
The utility model selects the conversion circuit built by the video conversion chip, can support the transmission requirement of using ALTERNATIVE MODE (interactive mode) 32.4Gbps bandwidth by the USB Type-C interface, and the HDMI transmitting end fixed rate link of the high-definition multimedia digital interface can support 48Gbps at most, has the advantages of low delay, low power consumption and low cost, can support the SDP package and DSC stream output of all display ports, can realize HDMI TMDS and FRL modes in HDCP1.4 and HDCP2.2/2.3, can also support audio input and audio extraction, and brings the visual enjoyment of the immersive high definition.
Drawings
In order to more clearly illustrate the utility model or the solutions of the prior art, a brief description will be given below of the drawings used in the description of the embodiments or the prior art, it being obvious that the drawings in the description below are some embodiments of the utility model and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of an interface of the present utility model;
FIG. 2 is a schematic circuit diagram of an embodiment of a USB Type-C interface module according to the present utility model;
FIG. 3 is a schematic circuit diagram of a master video signal conversion module according to an embodiment of the present utility model;
FIG. 4 is a schematic circuit diagram of an HDMI interface module according to an embodiment of the utility model;
fig. 5 is a schematic circuit diagram of a power module according to the present utility model.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs; the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model; the terms "comprising" and "having" and any variations thereof in the description of the utility model and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the utility model may be combined with other embodiments.
In order to enable those skilled in the art to better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings.
As shown in FIG. 1, the signal conversion circuit for converting HDMI high-definition video signals by using USBC comprises an USB Type-C interface module supporting a DP protocol version 1.4, a main control video signal conversion module and an HDMI interface module, wherein the input end of the main control video signal conversion module is connected with the output end of the USB Type-C interface module and receives the DP video signals, the output end of the main control video signal conversion module is connected with the HDMI interface and outputs HDMI high-definition video signals, and the USB Type-C interface module is provided with four groups of signal differential pair data transmission channels for transmitting DP signal data streams and a pair of auxiliary signal differential pair channels for realizing video protocol communication handshaking. Thereby meeting the requirement of high-speed transmission of video through USB Tyce-C interface.
Preferably, the high-definition video signal conversion circuit is a video signal transmission conversion circuit for converting DP1.4 into HDMI2.1, so that the USB type C can convert the HDMI signal by using DP signals, the circuit is simple and cost-effective, the conversion of the maximum 8K resolution is realized, and only one 4M flash chip supporting QSPI is needed to be matched for use.
As shown in fig. 2, the USB Type-C interface module of this example includes a USB Type-C interface, where the USB Type-C interface is provided with 8 signal pins respectively connected with four sets of signal differential pair data transmission channels, a pair of protocol pins connected with an auxiliary signal differential pair channel, and a VBUS pin for supplying power to the whole circuit, and the four sets of signal differential pair data transmission channels are further provided with coupling units respectively.
The coupling unit is a coupling capacitor connected in series to the signal lines of each signal differential pair data transmission channel, one signal line of the auxiliary signal differential pair channel is connected with a pull-up resistor which is pulled up to a power supply, and the other signal line is connected with a grounding resistor.
In this example, the USB Type-C interface CN1 is a Type-C male data port, and after being inserted into a Type-C female socket of a computer, a VBUS1 power supply supplies a power supply voltage through a CC1 pin, so that a main control chip GSV6201 of the main control video signal conversion module is in a power supply on working state; the 4 groups of high-speed signal differential pairs TX1, TX2, RX1 and RX2 are connected to the main control chip GSV6201 through 8 coupling capacitors C1-C8 and used for transmitting DP1.4 high-speed signal data streams; AUX_P and AUX_N are a group of auxiliary signal differential pair channels, so that video protocol communication handshake is realized.
As shown in fig. 3, the main control video signal conversion module of this example includes a main control chip U1, and a reset chip U2 and a memory chip U3 respectively connected to the main control chip U1, where the main control chip U1 adopts a GSV6201 main control chip.
The DP1.4 signals enter the main control chip U1 chip 55 to 64 pins through 4 groups of High-speed signal differential pairs, the DP protocol is converted into an HDMI protocol through a video data stream protocol, and meanwhile, information such as relevant HDR (High-DYNAMIC RANGE High dynamic contrast display technology), HDCP (High-bandwidth Digital Content Protection, high bandwidth digital content protection technology) decryption/encryption, DSC (DISPLAY STREAM Compression, display stream Compression technology) and the like is processed, so that High-definition video signal streams with HDMI2.1 High specification up to 76804320@60 Hz are output.
In the example, the crystal oscillator Y1 is an external 25M crystal oscillator, and provides a high-efficiency and accurate clock for the main control chip to perform high-speed operation. The service chip U2 is an ME2805A293XG reset chip, and delay is carried out through the chip after 3.3V conversion output, so that the power supply time sequence of the chip is reasonably ensured to be 1.2V and not later than 3.3V. The storage chip U3 is a 4M ZB25D40BTIG external flash chip supporting QSPI and is used for storing GSV6201 running programs through SPI communication.
As shown in fig. 4, the HDMI interface module of this embodiment includes an HDMI interface CN2, where the HDMI interface CN2 is provided with four sets of signal differential pairs for receiving the output signals of the master video signal conversion module, and a set of HDMIDDC display data channels for video protocol communication between the handshake source end and the device end.
In this example, TX0, 1, 2, and C are 4 groups of high-speed signal differential pairs, and when operating in TMDS (transition minimized differential signaling) mode, 3 groups of data channels are used to transmit data streams, and when operating in FRL (fixed rate link) mode, 4 groups of data channels are used to transmit data streams, thereby increasing the amount of video transmission data; TX_SCL and TX_SDA form HDMIDDC (Display Data Channel) display data channels based on I2C protocol, and are used for video protocol communication between a handshake source end and a device end to acquire EDID information.
As shown in fig. 5, the utility model further includes a power module connected to the power output end of the USB Type-C interface, where the power module includes a first conversion voltage conversion branch and a second voltage conversion branch, and the first voltage conversion branch reduces the 5V voltage of the USB Type-C interface to 1.2V to provide a core working voltage for the chip; the second voltage conversion branch circuit is used for converting the 5V voltage of the USB Type-C interface into 3.3V voltage in a down-converting mode, working voltage is provided for a peripheral IO port of a main control chip of the main control video signal conversion module, and a 1N5819 diode D2 is arranged at the power input end of the second voltage conversion branch circuit, so that serial power between 5V and 3.3V power supplies is prevented.
Compared with the prior art, the utility model can realize the high-speed signal transmission of the DP1.4 high-definition digital display interface standard through the USB Type-C interface, the utility model selects the conversion circuit built by the video conversion chip, can support the transmission requirement of the USB Type-C interface using ALTERNATIVE MODE (interactive mode) with the bandwidth of 32.4Gbps, and the HDMI transmitting end fixed rate link of the high-definition multimedia digital interface supports 48Gbps at most, and has the advantages of low delay, low power consumption and low cost, can support the SDP package and DSC stream output of all display ports, can realize HDMI TMDS and FRL modes in HDCP1.4 and HDCP2.2/2.3, can also support audio input and audio extraction, and brings the experience of high-definition visual enjoyment of the body.
The above embodiments are preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model, which includes but is not limited to the embodiments, and equivalent modifications according to the present utility model are within the scope of the present utility model.
Claims (7)
1. A signal conversion circuit for converting an HDMI high-definition video signal by using USBC is characterized in that: the device comprises a USB Type-C interface module supporting a DP protocol, a main control video signal conversion module and an HDMI interface module, wherein the input end of the main control video signal conversion module is connected with the output end of the USB Type-C interface and receives the DP video signal, the output end of the main control video signal conversion module is connected with the HDMI interface and outputs HDMI high-definition video signals, and the USB Type-C interface module is provided with four groups of signal differential pair data transmission channels for transmitting DP signal data streams and a pair of auxiliary signal differential pair channels for realizing video protocol communication handshake.
2. The USBC conversion HDMI high-definition video signal conversion circuit according to claim 1, wherein: the USB Type-C interface module includes a USB Type-C interface,
The USB Type-C interface is provided with 8 signal pins which are respectively connected with four groups of signal differential pair data transmission channels, a pair of protocol pins which are connected with auxiliary signal differential pair channels, and a VBUS pin which supplies power for the whole circuit,
And the four groups of signal differential pair data transmission channels are respectively provided with a coupling unit.
3. The USBC conversion HDMI high-definition video signal conversion circuit according to claim 2, wherein: the coupling unit is a coupling capacitor connected in series on the signal line of each signal differential pair data transmission channel,
One signal wire of the auxiliary signal differential pair channel is connected with a pull-up resistor which is pulled up to a power supply, and the other signal wire is connected with a grounding resistor.
4. The USBC conversion HDMI high-definition video signal conversion circuit according to claim 2, wherein: the USB Type-C interface comprises a USB Type-C interface, and is characterized by further comprising a power module connected with the power output end of the USB Type-C interface, wherein the power module comprises a first voltage conversion branch and a second voltage conversion branch, and the first voltage conversion branch reduces the 5V voltage of the USB Type-C interface to 1.2V to provide core working voltage for a chip; the second voltage conversion branch circuit is used for converting the 5V voltage of the USB Type-C interface into 3.3V voltage, working voltage is provided for the peripheral IO port of the main control chip of the main control video signal conversion module, and a diode D2 for preventing serial connection between the 5V power supply and the 3.3V power supply is arranged at the power supply input end of the second voltage conversion branch circuit.
5. The USBC conversion HDMI high-definition video signal conversion circuit according to any one of claims 1 to 4, wherein: the main control video signal conversion module comprises a main control chip U1, a reset chip U2 and a storage chip U3 which are respectively connected with the main control chip U1, wherein the main control chip U1 adopts a GSV6201 main control chip.
6. The USBC conversion HDMI high-definition video signal conversion circuit according to any one of claims 1 to 4, wherein: the HDMI interface module comprises an HDMI interface, and the HDMI interface is provided with four groups of signal differential pairs for receiving signals output by the main control video signal conversion module, and a group of HDMIDDC display data channels for video protocol communication between a handshake source end and a device end.
7. The USBC conversion HDMI high-definition video signal conversion circuit of claim 6, wherein: one end of the HDMIDDC display data channel is connected with the main control video signal conversion module, the other end of the HDMIDDC display data channel is connected with the pin 15 and the pin 16 of the HDMI interface respectively, two data lines of the HDMIDDC display data channel are connected with a resistor R4 and a resistor R5 respectively, and the other ends of the resistor R4 and the resistor R5 are connected with a power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322675632.5U CN220896745U (en) | 2023-10-07 | 2023-10-07 | Signal conversion circuit for converting HDMI high-definition video signals by using USBC |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322675632.5U CN220896745U (en) | 2023-10-07 | 2023-10-07 | Signal conversion circuit for converting HDMI high-definition video signals by using USBC |
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| CN220896745U true CN220896745U (en) | 2024-05-03 |
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| CN202322675632.5U Active CN220896745U (en) | 2023-10-07 | 2023-10-07 | Signal conversion circuit for converting HDMI high-definition video signals by using USBC |
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- 2023-10-07 CN CN202322675632.5U patent/CN220896745U/en active Active
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