Display interface connecting device

Abstract

The utility model provides a display interface connecting device. The display interface connecting device comprises a first interface module, a signal protection module and a second interface module, the first interface module is a display signal input interface of the device and is used for being connected with a display signal output end of an external host so as to receive a display signal output by the display signal output end of the external host; the first interface module is connected with the second interface module through the signal protection module; and the second interface module is a display signal output interface of the device and is used for being connected with a display signal input end of a display terminal so as to output the display signal processed by the signal protection module to the display terminal. According to the application, the display interface of the external host equipment can be conveniently expanded.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display interface connection device. Background Art

[0002] like Figure 1 As shown, currently host devices such as industrial computers and counter terminals have multiple display interfaces, but most users actually use a single display interface, and the utilization rate of redundant display interfaces is very low; in addition, with the update and iteration of products, users' demand for thinness and lightness is increasing, and the structural space for designers is shrinking; secondly, different banks have highly differentiated requirements for display interfaces. When the display requirements of banks cannot be met, customized development boards are required, and the board development cycle is long and requires considerable investment.

[0003] Therefore, a more flexible display interface configuration scheme needs to be designed. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a display interface connection device, which is convenient for expanding the display interface of a host device.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A display interface connection device, the device comprising: a first interface module, a signal protection module and a second interface module;

[0007] The first interface module is a display signal input interface of the device, which is used to connect to the display signal output terminal of the external host to receive the display signal output by the display signal output terminal of the external host;

[0008] The first interface module is connected to the second interface module via the signal protection module;

[0009] The second interface module is a display signal output interface of the device, and is used to be connected to a display signal input terminal of a display terminal so as to output a display signal processed by the signal protection module to the display terminal.

[0010] In a possible implementation, the signal protection module includes an isolation DC circuit, an electromagnetic interference protection circuit, and an electrostatic protection circuit connected between the first interface module and the second interface module.

[0011] In a possible implementation, the display signal output terminal of the external host is the HDMI display signal output terminal of the external host, the DP display signal output terminal of the external host, the VGA display signal output terminal of the external host, or the DVI display signal output terminal of the external host; the corresponding second interface module is an HDMI interface, a DP interface, a VGA interface, or a DVI interface.

[0012] In a possible implementation, the display signal output terminal of the external host is a DP display signal output terminal of the external host, which is used to output the main channel signal, the auxiliary signal, the hot plug detection signal and the power signal in the DP display signal of the external host;

[0013] The first interface module includes a first signal terminal, a second signal terminal, a third signal terminal and a fourth signal terminal; the first signal terminal, the second signal terminal, the third signal terminal and the fourth signal terminal are respectively connected to the main channel signal, the auxiliary signal, the hot plug detection signal and the power signal in the DP display signal output by the external host;

[0014] The second interface module includes a fifth signal terminal, a sixth signal terminal, a seventh signal terminal and an eighth signal terminal; the fifth signal terminal, the sixth signal terminal, the seventh signal terminal and the eighth signal terminal are respectively used to output the main channel signal, the auxiliary signal, the hot plug detection signal and the power signal processed by the signal protection module;

[0015] The second interface module is a DP interface.

[0016] In a possible implementation, the signal protection module includes a first AC coupling capacitor and a second AC coupling capacitor;

[0017] The first AC coupling capacitor is connected in series between the first signal terminal and the fifth signal terminal;

[0018] The second AC coupling capacitor is connected in series between the second signal terminal and the sixth signal terminal.

[0019] In a possible implementation, the signal protection module further includes a first resistor; the second signal terminal is connected in series with the second AC coupling capacitor and then in parallel with the first resistor, and then connected to the sixth signal terminal.

[0020] In a possible implementation, the signal protection module further includes a first common mode inductor, a second common mode inductor, a first ESD protection device, and a second ESD protection device;

[0021] The first signal terminal is connected in series with the first AC coupling capacitor and the first common mode inductor in sequence, and then connected in parallel with the first ESD protection device, and then connected to the fifth signal terminal;

[0022] The second signal terminal is connected in series with the second AC coupling capacitor, in parallel with the first resistor, in series with the second common mode inductor, and in parallel with the second ESD protection device, and then connected to the fifth signal terminal.

[0023] In a possible implementation manner, a characteristic impedance value of a transmission line connected between the first signal terminal and the fifth signal terminal is 50Ω.

[0024] In a possible implementation, the signal protection module includes a level conversion circuit; the fourth signal terminal includes a first power supply terminal and a second power supply terminal;

[0025] The level conversion circuit includes an NMOS tube, a second resistor and a third resistor; the third signal terminal is connected to the first power supply terminal via the second resistor and is connected to the S pole (gate) of the NMOS tube; the seventh signal terminal is connected to the second power supply terminal via the third resistor and is connected to the D pole (drain) of the NMOS tube; the G pole (source) of the NMOS tube is connected to the first power supply terminal.

[0026] In a possible implementation, the signal protection module further includes a Schottky diode, a decoupling capacitor, and a third ESD protection device;

[0027] The fourth signal terminal is connected in series with a Schottky diode, in parallel with a decoupling capacitor, and in parallel with a third ESD protection device, and then connected to the eighth signal terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the display interface of some current host devices such as industrial computers and counter terminals;

[0029] Figure 2 This is a schematic diagram of an application scenario of an embodiment of the present application;

[0030] Figure 3 This is a schematic diagram of the connection relationship in the application of the embodiment of this application. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0032] It should be noted that the terms such as "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish only various entities or operations, and do not necessarily require or imply that there is a specific relationship or order between these entities or operations. It should be understood that the data used in this way can be interchanged under appropriate circumstances. In addition, "first" and "second" do not represent the uniqueness in quantity, and they may include multiple corresponding entities. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, article or equipment including a series of elements not only includes those elements clearly listed, but also includes other elements that are not clearly listed, or may also include elements inherent to such process, method, product or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0033] In this application, the terms "install", "set", "provided with", "connect", "connected", and "socketed" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] like Figure 1 As shown in the figure, some industrial computers and counter terminals currently have multiple standard display interfaces, such as HDMI standard sockets and related components, DP standard sockets and related components, VGA standard sockets and related components, DVI standard sockets and related components, etc. HDMI standard sockets, DP standard sockets, VGA standard sockets, and DVI standard sockets are referred to as HDMI interface, DP interface, VGA interface, or DVI interface. In reality, most users use a single standard display interface, and the usage rate of redundant standard display interfaces is very low; and with the update and iteration of products, users' demand for thinness and lightness is increasing; secondly, different banks have highly differentiated demands for standard display interfaces.

[0035] Therefore, the present application proposes a display interface connection device, which includes: a first interface module, a signal protection module and a second interface module; the first interface module is a display signal input interface of the device, which is used to connect to the display signal output end of an external host to receive a display signal output by the display signal output end of the external host; the first interface module is connected to the second interface module through the signal protection module; the second interface module is a display signal output interface of the device, which is used to connect to the display signal input end of a display terminal to output a display signal processed by the signal protection module to the display terminal.

[0036] like Figure 2 As shown, by using the display interface connection device of the present application, the motherboard can change the original multiple standard display interfaces into a single standard display interface, that is, only one standard display interface (HDMI standard socket and related components) is retained, and only simple interfaces are reserved for other display interfaces. Users can use the display interface connection device provided by the present application to expand the display interface. In this way, the utilization rate of the host device interface will be optimized, the motherboard space and cost will be saved, and the changing demand scenarios will be coped with. For example, when the bank's new product has different display requirements, such as when only a single HDMI display interface is required, there is no need to add optional accessories, and the HDMI standard socket can be used to meet the requirements; when multiple display interfaces or specific display interfaces are required, the corresponding display interface connection device can be added according to the needs, such as the standard DP expansion module, standard VGA expansion module, and standard DVI expansion module in the figure. A single display expansion module includes a cable and an interface board. Different structural sizes and different motherboards or graphics cards can use the present application scheme, and the present application scheme can be applied to a variety of motherboards or graphics cards. By adopting the solution of the present application, the display interface of the host device can be expanded according to needs without reducing the display performance. After actual testing, the display interface connection device provided in the embodiment of the present application can achieve the display resolution of the original standard display interface and support resolutions above 4K, which is ahead of the display device expanded by the USB interface and only supports a maximum resolution of 1080P.

[0037] Specific embodiments according to the present application will be described below with reference to the accompanying drawings.

[0038] An embodiment of the present application provides a display interface connection device, the device comprising: a first interface module, a signal protection module, and a second interface module;

[0039] The first interface module is a display signal input interface of the device, which is used to connect to the display signal output terminal of the external host to receive the display signal output by the display signal output terminal of the external host;

[0040] The first interface module is connected to the second interface module via the signal protection module;

[0041] The second interface module is a display signal output interface of the device, and is used to be connected to a display signal input terminal of a display terminal so as to output a display signal processed by the signal protection module to the display terminal.

[0042] It should be noted that, using the display interface connection device provided in the embodiment of the present application, the display signal output end of the external host can adopt a simple interface, and the first interface module is connected to the simple interface to receive the display signal in a specific format output by the external host, which is processed by the signal protection module and then output to the display terminal through the second interface module.

[0043] The second interface module is a standard display interface. For example, the display signal output terminal of the external host is an HDMI display signal output terminal of the external host, a DP display signal output terminal of the external host, a VGA display signal output terminal of the external host, or a DVI display signal output terminal of the external host. The corresponding second interface module is an HDMI interface, a DP interface, a VGA interface, or a DVI interface.

[0044] Among them, the signal protection module may include an isolation DC circuit, an electromagnetic interference protection circuit and an electrostatic protection circuit connected between the first interface module and the second interface module, which are used to perform isolation and protection processing on the received display signal to ensure signal quality and display performance.

[0045] Exemplarily, the display signal output terminal of the external host is a DP display signal output terminal of the external host, which is used to output the main channel signal, the auxiliary signal, the hot plug detection signal and the power signal in the DP display signal of the external host;

[0046] The first interface module includes a first signal terminal, a second signal terminal, a third signal terminal and a fourth signal terminal; the first signal terminal, the second signal terminal, the third signal terminal and the fourth signal terminal are respectively connected to the main channel signal, the auxiliary signal, the hot plug detection signal and the power signal in the DP display signal output by the external host;

[0047] The second interface module includes a fifth signal terminal, a sixth signal terminal, a seventh signal terminal and an eighth signal terminal; the fifth signal terminal, the sixth signal terminal, the seventh signal terminal and the eighth signal terminal are respectively used to output the main channel signal, the auxiliary signal, the hot plug detection signal and the power signal processed by the signal protection module;

[0048] The second interface module is a DP interface.

[0049] It should be understood that DisplayPort (DP for short) is a digital video interface standard developed by a PC and chip manufacturer alliance and standardized by the Video Electronics Standards Association (VESA). The DP interface here, namely the DisplayPort interface, is an interface that complies with the DP digital video interface standard, which is the DP standard socket mentioned above.

[0050] Exemplarily, the main channel signal, the auxiliary signal, the hot plug detection signal and the power signal in the DP display signal output by the external host are output to the device through the flexible printed circuit board.

[0051] It should be understood that the DP interface is a DP standard socket.

[0052] Exemplarily, the signal protection module may include a first AC coupling capacitor and a second AC coupling capacitor;

[0053] The first AC coupling capacitor is connected in series between the first signal terminal and the fifth signal terminal;

[0054] The second AC coupling capacitor is connected in series between the second signal terminal and the sixth signal terminal.

[0055] It should be understood that the DP display signal output end of the external host can use 4 high-speed data channels to transmit differential signals (main channel signals) and 1 low-speed channel to transmit auxiliary information (auxiliary signal). The 4 main channel signals and 1 auxiliary signal each contain a set of positive and negative differential signals. Therefore, the first signal end here can contain 8 signals, and the second signal end can contain 2 signals. In this way, an AC coupling capacitor is connected to each signal to isolate the DC component.

[0056] Exemplarily, the signal protection module further includes a first resistor; the second signal terminal is connected in series with the second AC coupling capacitor and then in parallel with the first resistor, and then connected to the sixth signal terminal.

[0057] It should be understood that the second signal terminal includes two pins, which are respectively connected to the positive signal and the negative signal of the auxiliary channel in the DP display signal output by the external host. The second resistor here includes two resistors, wherein the pin connected to the positive signal is connected to the fourth signal terminal through a resistor (the resistor is used as a pull-up resistor); wherein the pin connected to the negative signal is connected to the ground through another resistor (the resistor is used as a pull-down resistor) through the second resistor.

[0058] Exemplarily, the signal protection module may further include a first common mode inductor, a second common mode inductor, a first ESD (Electro-Static discharge) protection device, and a second ESD protection device;

[0059] The first signal terminal is connected in series with the first AC coupling capacitor and the first common mode inductor in sequence, and then connected in parallel with the first ESD protection device, and then connected to the fifth signal terminal;

[0060] The second signal terminal is connected in series with the second AC coupling capacitor, in parallel with the first resistor, in series with the second common mode inductor, and in parallel with the second ESD protection device, and then connected to the fifth signal terminal.

[0061] Among them, the common-mode inductor, as an electromagnetic compatibility (EMC) device, is used to filter common-mode electromagnetic interference signals.

[0062] Exemplarily, the characteristic impedance value of the transmission line connected between the first signal terminal and the fifth signal terminal is 50 Ω.

[0063] By setting the characteristic impedance value of the transmission line connected between the first signal terminal and the fifth signal terminal to 50 Ω, the impedance matching between the transmission line and the standard DP interface load is achieved, so as to reduce signal reflection and distortion and improve the quality of signal transmission.

[0064] For example, the characteristic impedance value can be set to 50 Ω by setting parameters such as stack-up design, line width, line spacing, interlayer dielectric thickness, copper thickness, solder mask thickness, etc. of the transmission line during the printed circuit board (PCB) layout stage.

[0065] Exemplarily, the signal protection module may further include a level conversion circuit; the fourth signal terminal includes a first power supply terminal and a second power supply terminal;

[0066] The level conversion circuit includes an NMOS transistor, a second resistor, and a third resistor; the third signal terminal is connected to the first power supply terminal through the second resistor and is connected to the S pole of the NMOS transistor; the seventh signal terminal is connected to the second power supply terminal through the third resistor and is connected to the D pole of the NMOS transistor; the G pole of the NMOS transistor is connected to the first power supply terminal.

[0067] Among them, the first power supply terminal is the main board power supply terminal, and its level is the level required by the main board, such as 3.3 V. The output level of the second power supply terminal is generally different from the level required by the main board, such as 5 V. Both the second resistor and the third resistor are used as pull-up resistors.

[0068] Exemplarily, when a display terminal is inserted into the connection device, the HPD signal of the seventh signal terminal is a 5 V high level, Vgs < Vgs(th), where Vgs is the gate-source voltage and Vgs(th) is the gate-source voltage when the conductive channel starts to form, that is, the turn-on voltage; at this time, the NMOS transistor is cut off, and the HPD signal of the third signal terminal is pulled up to 3.3 V through the pull-up; when no display terminal is inserted into the connection device, the HPD signal of the seventh signal terminal is a low level, and the S pole of the NMOS transistor is pulled low, so that Vgs > Vgs(th), the NMOS transistor is turned on, and the HPD signal of the third signal terminal is pulled low to output a low level. Thus, HPD signal detection can be realized.

[0069] Exemplarily, the signal protection module may further include a Schottky diode, a decoupling capacitor, and a third ESD protection device;

[0070] The fourth signal terminal is connected in series with a Schottky diode, in parallel with a decoupling capacitor, and in parallel with a third ESD protection device, and then connected to the eighth signal terminal.

[0071] Among them, Schottky diodes are used to protect other components from overvoltage or reverse voltage.

[0072] The above description of the embodiments of the present application is only a partial embodiment of the present application, which is used to enable professionals in the field to implement or use the content of the present application, and is not used to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A display interface connection device, characterized in that: The device comprises: a first interface module, a signal protection module and a second interface module; The first interface module is a display signal input interface of the device, which is used to connect to the display signal output terminal of the external host to receive the display signal output by the display signal output terminal of the external host; The first interface module is connected to the second interface module through the signal protection module; The second interface module is a display signal output interface of the device, and is used to be connected to a display signal input terminal of a display terminal so as to output a display signal processed by the signal protection module to the display terminal.

2. The device according to claim 1, characterized in that The signal protection module includes an isolation DC circuit, an electromagnetic interference protection circuit and an electrostatic protection circuit connected between the first interface module and the second interface module.

3. The device according to claim 1, characterized in that The display signal output terminal of the external host is an HDMI display signal output terminal of the external host, a DP display signal output terminal of the external host, a VGA display signal output terminal of the external host, or a DVI display signal output terminal of the external host; The corresponding second interface module is an HDMI interface, a DP interface, a VGA interface or a DVI interface.

4. The device according to claim 3, characterized in that The display signal output terminal of the external host is a DP display signal output terminal of the external host, which is used to output the main channel signal, auxiliary signal, hot plug detection signal and power signal in the DP display signal of the external host; The first interface module includes a first signal terminal, a second signal terminal, a third signal terminal and a fourth signal terminal; the first signal terminal, the second signal terminal, the third signal terminal and the fourth signal terminal are respectively connected to the main channel signal, the auxiliary signal, the hot plug detection signal and the power signal in the DP display signal output by the external host; The second interface module includes a fifth signal terminal, a sixth signal terminal, a seventh signal terminal and an eighth signal terminal; the fifth signal terminal, the sixth signal terminal, the seventh signal terminal and the eighth signal terminal are respectively used to output the main channel signal, the auxiliary signal, the hot plug detection signal and the power signal processed by the signal protection module; The second interface module is a DP interface.

5. The device according to claim 4, characterized in that The signal protection module includes a first AC coupling capacitor and a second AC coupling capacitor; The first AC coupling capacitor is connected in series between the first signal terminal and the fifth signal terminal; The second AC coupling capacitor is connected in series between the second signal terminal and the sixth signal terminal.

6. The device according to claim 5, characterized in that The signal protection module further includes a first resistor; the second signal terminal is connected in series with a second AC coupling capacitor and then in parallel with the first resistor, and then connected to the sixth signal terminal.

7. The device according to claim 6, characterized in that The signal protection module further includes a first common mode inductor, a second common mode inductor, a first ESD protection device and a second ESD protection device; The first signal terminal is connected in series with a first AC coupling capacitor and a first common mode inductor in sequence, and then connected in parallel with a first ESD protection device, and then connected to a fifth signal terminal; The second signal terminal is connected in series with the second AC coupling capacitor, in parallel with the first resistor, in series with the second common mode inductor, and in parallel with the second ESD protection device, and then connected to the fifth signal terminal.

8. The device according to claim 7, characterized in that The characteristic impedance value of the transmission line connected between the first signal terminal and the fifth signal terminal is 50Ω.

9. The device according to any one of claims 4 to 8, characterized in that: The signal protection module includes a level conversion circuit; the fourth signal terminal includes a first power supply terminal and a second power supply terminal; The level conversion circuit includes an NMOS tube, a second resistor and a third resistor; the third signal terminal is connected to the first power supply terminal via the second resistor and is connected to the S pole of the NMOS tube; the seventh signal terminal is connected to the second power supply terminal via the third resistor and is connected to the D pole of the NMOS tube; the G pole of the NMOS tube is connected to the first power supply terminal.

10. The device according to claim 9, characterized in that The signal protection module also includes a Schottky diode, a decoupling capacitor, and a third ESD protection device; The fourth signal terminal is connected in series with the Schottky diode, in parallel with the decoupling capacitor, and in parallel with the third ESD protection device, and then connected to the eighth signal terminal.

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