CN217035111U - Display drive board system with KVM function - Google Patents
Display drive board system with KVM function Download PDFInfo
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- CN217035111U CN217035111U CN202123345102.1U CN202123345102U CN217035111U CN 217035111 U CN217035111 U CN 217035111U CN 202123345102 U CN202123345102 U CN 202123345102U CN 217035111 U CN217035111 U CN 217035111U
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Abstract
The utility model provides a display driving board system with a KVM function, HDMI signals are converted into four paths of differential optical signals, optical fibers are adopted for long-distance transmission, an HDMI-to-RJ 45 module is adopted for converting the four paths of differential optical signals into HDMI signals, long-distance transmission is carried out through the optical fibers, and the purpose of receiving the long-distance optical signals is achieved through the HDMI-to-RJ 45 module; the HDMI video input signal is firstly shaped and compensated through a cable equalizer, so that the noise resistance of the HDMI video input signal can be improved, the remote display of the HDMI video input signal is realized, and the stability of the video signal display is ensured; the ESD protector is arranged to inhibit surge on the cable, so that the HDMI-RJ 45 conversion module and a rear-stage circuit are protected; a low-pass filter is arranged to reduce the interference of the high-frequency signal to the cable equalizer; an anti-interference circuit is arranged to limit ESD discharge current, and the purpose of static electricity prevention is achieved.
Description
Technical Field
The utility model relates to the field of video transmission, in particular to a display driving board system with a KVM function.
Background
A multi-computer switch (KVM) is a management device in a network, which is the first letter of three words, Keyboard, Video, and Mouse. Namely, a set of keyboard, display and mouse can be used for controlling a plurality of devices. The KVM function is to share one display with multiple hosts at the same time. At present, a display with a KVM function appears on the market, which has an HDMI interface and can transmit an ultra high definition video signal, but because the ultra high definition signal has a large data volume and a high transmission rate, data attenuation is severe in a transmission process, a transmission distance is generally not more than 5m at most, and a remote transmission is required in practical application. Therefore, in order to solve the above problems, the present invention provides a display driver board system with a KVM function, which realizes remote transmission of an ultra high definition video signal on the premise of having the KVM function.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a display driver board system with a KVM function, which realizes remote transmission of ultra high definition video signals on the premise of having the KVM function.
The technical scheme of the utility model is realized as follows: the utility model provides a display driving board system with a KVM function, which comprises a KVM controller, an HDMI-to-LVDS module, a display screen, an HDMI-to-RJ 45 module, an ESD protector and a cable equalizer, wherein the HDMI-to-RJ 45 module is connected with the display screen through the cable equalizer;
the HDMI-to-RJ 45 module converts an external HDMI signal into four paths of differential signals, the four paths of differential signals are correspondingly input to eight input ends of the ESD protector one by one, eight output ends of the ESD protector are electrically connected with the input end of the HDMI-to-LVDS module through a cable equalizer, and the output end of the HDMI-to-LVDS module is electrically connected with the display screen;
the keyboard and the mouse are electrically connected with the KVM controller through serial ports, and the KVM controller is electrically connected with the serial port of the HDMI-to-LVDS module through an I2C bus.
On the basis of the technical scheme, preferably, the ESD protector comprises two paths of four-channel ESD protection diodes;
the input ends of the two paths of four-channel ESD protection diodes are respectively input with four paths of differential signals in a one-to-one correspondence manner, and the output ends of the two paths of four-channel ESD protection diodes are electrically connected with the input end of the HDMI-to-LVDS module through a cable equalizer.
On the basis of the above technical solution, preferably, the system further comprises eight low-pass filters;
the eight low-pass filters are respectively connected in series between the output end of the ESD protector and the cable equalizer in a one-to-one correspondence manner.
On the basis of the above technical solution, preferably, the low-pass filter is an RC low-pass filter.
On the basis of the technical scheme, the anti-interference circuit also comprises two paths of anti-interference circuits;
the input end of the anti-interference circuit is electrically connected with the two output ends of the ESD protector respectively, and the output end of the anti-interference circuit is electrically connected with the I/O port of the KVM controller.
On the basis of the technical scheme, preferably, the anti-interference circuit comprises magnetic beads FB14-FB 17;
one end of magnetic bead FB16 and magnetic bead FB17 respectively with ESD protector's two output electric connection, the other end of magnetic bead FB16 passes through magnetic bead FB14 and KVM controller's I/O mouth electric connection, the other end of magnetic bead FB17 passes through magnetic bead FB15 and KVM controller's I/O mouth electric connection.
On the basis of the above technical solution, preferably, the cable equalizer adopts a MAX3815 equalizer;
three CML differential input signal ends and one clock input end of the MAX3815 equalizer are respectively electrically connected with the output end of the ESD protector in a one-to-one correspondence manner; and three CML differential output signal ends and one clock output end of the MAX3815 equalizer are respectively electrically connected with the input end of the HDMI-to-LVDS module.
Compared with the prior art, the display driving board system with the KVM function has the following beneficial effects:
(1) the HDMI signals are converted into four paths of differential optical signals, optical fibers are used for long-distance transmission, the four paths of differential optical signals are converted into HDMI signals by an HDMI-to-RJ 45 module, long-distance transmission is carried out through the optical fibers, and the purpose of receiving the long-distance optical signals is achieved through the HDMI-to-RJ 45 module;
(2) the HDMI video input signal is firstly shaped and compensated through a cable equalizer, so that the noise resistance of the HDMI video input signal can be improved, the remote display of the HDMI video input signal is realized, and the stability of the video signal display is ensured;
(3) the ESD protector is arranged to inhibit surge on the cable, so that the HDMI-RJ 45 conversion module and a rear-stage circuit are protected; a low-pass filter is arranged to reduce the interference of the high-frequency signal to the cable equalizer; an anti-interference circuit is arranged to limit ESD discharge current, so that the purpose of static electricity prevention is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of a KVM capable display driver board system according to the present invention;
FIG. 2 is a circuit diagram of an HDMI to RJ45 module in a driving board system of a display with KVM function according to the present invention;
FIG. 3 is a circuit diagram of an ESD protector, four low pass filters and an anti-jamming circuit in a KVM capable display driver board system according to the present invention;
FIG. 4 is a diagram of a peripheral circuit of a KVM controller in a display driver board system with KVM functionality according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention.
Since the HDMI ultra high definition signal has a large data volume, and the data attenuation is severe in the transmission process with a high transmission rate, and the maximum transmission distance is 5m, in order to solve the above problem, as shown in fig. 1, a display driving board system with a KVM function according to the present invention includes a KVM controller, an HDMI-to-LVDS module, a display screen, an HDMI-to-RJ 45 module, an ESD protector, and a cable equalizer.
The KVM controller has an I/O port electrically connected to the cathode of the indicator lamp in the HDMI-RJ 45 module, and an anode of the indicator lamp electrically connected to the power supply for controlling the on/off of the indicator lamp in the HDMI-RJ 45 module; the KVM controller is electrically connected with an external keyboard and an external mouse through serial ports so as to control a plurality of devices by using one set of keyboard, display and mouse; the KVM controller is electrically connected with the serial port of the HDMI-to-LVDS module through an I2C bus so as to realize the switching use of different host display screens. As shown in fig. 4, in the KVM controller of this embodiment, a GD32F130F8P6 chip is adopted, and the MCU _ I2C1_ SDA and the MCU _ I2C1_ SCL are I2C interfaces and are electrically connected to the serial port of the HDMI-to-LVDS module; the USRAT0_ TX and USRAT0_ RX represent interfaces for connecting an external keyboard and mouse.
The HDMI changes RJ45 module, and the external host machine converts TMDS (transition minimized differential) differential signals into four optical signals through simple electro-optical conversion, and the four optical signals are transmitted through four optical fibers, and the four optical fibers are accessed into the system through the HDMI changes RJ45 module. At this time, the HDMI-RJ 45 module performs photoelectric conversion on four paths of optical signals transmitted on the cable to obtain four paths of differential signals, and the four paths of differential signals are input to eight input ends of the ESD protector in a one-to-one correspondence manner. The four paths of differential signals are respectively three paths of differential inputs and a path of clock. As shown IN FIG. 2, IN the present embodiment, RX0_ IN + _ EX, RX0_ IN- _ EX, RX1_ IN + _ EX, RX1_ IN- _ EX, RX2_ IN + _ EX, and RX2_ IN- _ EX respectively represent three-way differential inputs, and RX0_ IN + _ EX and RX0_ IN- _ EX represent one-way clocks.
ESD protectors, i.e. electrostatic discharge protectors. The HDMI is extremely sensitive to cable discharge from hot plug and direct electrostatic discharge from users, and in order to ensure its normal function, this embodiment provides an ESD protector to protect the HDMI-RJ 45 module and the subsequent circuit. In this embodiment, the four paths of differential signals are input to eight input ends of the ESD protector in a one-to-one correspondence manner, and eight output ends of the ESD protector are electrically connected to the input end of the cable equalizer. Preferably, the impact of the transient surge on the low clamping voltage is effectively suppressed, and the ESD protector in this embodiment includes two paths of four-channel ESD protection diodes; the input ends of the two paths of four-channel ESD protection diodes are respectively used for inputting four paths of differential signals in a one-to-one correspondence mode, and the output ends of the two paths of four-channel ESD protection diodes are electrically connected with the input end of the HDMI-to-LVDS module through a cable equalizer. As shown in fig. 3, the four-channel ESD protection diode may be a TPD4E05U06 device, which can be used to protect a high-speed signal pin of the cable equalizer from being burned out by a large current, and when ESD occurs, a low impedance path to ground is provided on the line, so as to protect the cable equalizer; and the total capacitance of the protection circuit can be effectively reduced, and meanwhile, the strong surge protection capability is kept.
Furthermore, because a large number of high-frequency signals are injected into the circuit when ESD occurs, in order to reduce the interference of the high-frequency signals to the cable equalizer, the embodiment is provided with eight low-pass filters to attenuate the high-frequency signals; and the eight paths of low-pass filters are respectively connected in series between the output end of the ESD protector and the cable equalizer in a one-to-one correspondence manner. Preferably, all the eight-way low-pass filters are RC low-pass filters.
Furthermore, in order to limit the ESD discharge current and achieve the purpose of preventing static electricity, the embodiment further provides two paths of anti-interference circuits; the input end of the anti-interference circuit is electrically connected with the two output ends of the ESD protector respectively, and the output end of the anti-interference circuit is electrically connected with the I/O port of the KVM controller. Preferably, as shown in FIG. 3, the anti-interference circuit comprises a slave magnetic bead FB14-FB 17; one end of the magnetic bead FB16 and one end of the magnetic bead FB17 are electrically connected to two output ends of the ESD protector, the other end of the magnetic bead FB16 is electrically connected to an I/O port of the KVM controller through the magnetic bead FB14, and the other end of the magnetic bead FB17 is electrically connected to an I/O port of the KVM controller through the magnetic bead FB 15.
The cable equalizer shapes and compensates the HDMI signals, improves the stability of the HDMI signals, and can prolong the DVI/HDMI signal transmission distance to 36 m. Preferably, the present embodiment employs a MAX3815 equalizer; three CML differential input signal ends and one clock input end of the MAX3815 equalizer are respectively electrically connected with the output end of the ESD protector in a one-to-one correspondence manner; and the three CML differential output signal ends and the clock output end of the MAX3815 equalizer are respectively and electrically connected with the input end of the HDMI-to-LVDS module.
The HDMI-to-LVDS module receives the HDMI video output signal, is used for converting the HDMI video output signal into an LVDS signal, and is also used for outputting the LVDS signal to the display screen. In this embodiment, the HDMI-to-LVDS module is connected to an LVDS interface of the display screen. Preferably, the HDMI-to-LVDS module adopts an LT8619B chip.
The working principle of the embodiment is as follows: the HDMI signals are electro-optically converted into four optical signals and transmitted through four optical fibers, 4 optical fibers are connected into the system through an HDMI-to-RJ 45 module, four optical signals transmitted on a cable are subjected to photoelectric conversion through an HDMI-to-RJ 45 module to obtain four differential signals, the four differential signals are respectively input into eight low-pass filters in one-to-one correspondence after transient surge suppression through an ESD protector, the eight low-pass filters attenuate high-frequency signals, and meanwhile, the four differential signals after the surge suppression are extracted by a single chip microcomputer through an anti-interference circuit to realize monitoring and feedback of the four differential signals; the four paths of attenuated differential signals are input to a cable equalizer, the cable equalizer shapes and compensates the HDMI signals transmitted from a long distance, and finally the signals are input to an HDMI-to-LVDS module, the HDMI-to-LVDS module converts the HDMI video output signals into LVDS signals, and the LVDS signals are further output to a display screen.
The beneficial effect of this embodiment does: the HDMI signals are converted into four paths of differential optical signals, optical fibers are used for long-distance transmission, the four paths of differential optical signals are converted into HDMI signals by an HDMI-to-RJ 45 module, long-distance transmission is carried out through the optical fibers, and the purpose of receiving the long-distance optical signals is achieved through the HDMI-to-RJ 45 module;
the HDMI video input signal is shaped and compensated by the cable equalizer, so that the noise immunity of the HDMI video input signal can be improved, the remote display of the HDMI video input signal is realized, and the stability of the video signal display is ensured;
the ESD protector is arranged to inhibit surge on the cable, so that the HDMI-RJ 45 conversion module and a rear-stage circuit are protected; a low-pass filter is arranged to reduce the interference of the high-frequency signal to the cable equalizer; an anti-interference circuit is arranged to limit ESD discharge current, and the purpose of static electricity prevention is achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The utility model provides a display drive plate system that possesses KVM function, its includes KVM controller, HDMI changes LVDS module and display screen, its characterized in that: the system also comprises an HDMI-to-RJ 45 module, an ESD protector and a cable equalizer;
the HDMI-to-RJ 45 module converts an external HDMI signal into four paths of differential signals, the four paths of differential signals are correspondingly input to eight input ends of the ESD protector one by one, eight output ends of the ESD protector are electrically connected with the input end of the HDMI-to-LVDS module through a cable equalizer, and the output end of the HDMI-to-LVDS module is electrically connected with the display screen;
the keyboard and the mouse are electrically connected with the KVM controller through serial ports, and the KVM controller is electrically connected with the serial port of the HDMI-to-LVDS module through an I2C bus.
2. The KVM capable display driver board system of claim 1, wherein: the ESD protector comprises two paths of four-channel ESD protection diodes;
the input ends of the two paths of four-channel ESD protection diodes are respectively used for inputting four paths of differential signals in a one-to-one correspondence mode, and the output ends of the two paths of four-channel ESD protection diodes are electrically connected with the input end of the HDMI-to-LVDS module through a cable equalizer.
3. The KVM capable display driver board system of claim 1, wherein: the system also comprises eight paths of low-pass filters;
and the eight paths of low-pass filters are respectively connected in series between the output end of the ESD protector and the cable equalizer in a one-to-one correspondence manner.
4. A KVM-enabled display driver board system according to claim 3, wherein: the low-pass filter is an RC low-pass filter.
5. The KVM capable display driver board system of claim 1, wherein: the device also comprises two paths of anti-interference circuits;
the input end of the anti-interference circuit is electrically connected with the two output ends of the ESD protector respectively, and the output end of the anti-interference circuit is electrically connected with the I/O port of the KVM controller.
6. A KVM capable display driver board system according to claim 5, wherein: the anti-interference circuit comprises magnetic beads FB14-FB 17;
one end of the magnetic bead FB16 and one end of the magnetic bead FB17 are electrically connected with two output ends of the ESD protector respectively, the other end of the magnetic bead FB16 is electrically connected with an I/O port of the KVM controller through the magnetic bead FB14, and the other end of the magnetic bead FB17 is electrically connected with an I/O port of the KVM controller through the magnetic bead FB 15.
7. The KVM capable display driver board system of claim 1, wherein: the cable equalizer adopts an MAX3815 equalizer;
the three CML differential input signal ends and the clock input end of the MAX3815 equalizer are respectively electrically connected with the output end of the ESD protector in a one-to-one correspondence manner; and the three CML differential output signal ends and the clock output end of the MAX3815 equalizer are respectively and electrically connected with the input end of the HDMI-to-LVDS module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123345102.1U CN217035111U (en) | 2021-12-28 | 2021-12-28 | Display drive board system with KVM function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123345102.1U CN217035111U (en) | 2021-12-28 | 2021-12-28 | Display drive board system with KVM function |
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| Publication Number | Publication Date |
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| CN217035111U true CN217035111U (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123345102.1U Active CN217035111U (en) | 2021-12-28 | 2021-12-28 | Display drive board system with KVM function |
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- 2021-12-28 CN CN202123345102.1U patent/CN217035111U/en active Active
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