CN106657941B - Photoelectric hybrid DisplayPort remote transmission device and method - Google Patents
Photoelectric hybrid DisplayPort remote transmission device and method Download PDFInfo
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- CN106657941B CN106657941B CN201611236439.XA CN201611236439A CN106657941B CN 106657941 B CN106657941 B CN 106657941B CN 201611236439 A CN201611236439 A CN 201611236439A CN 106657941 B CN106657941 B CN 106657941B
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Abstract
The invention provides a photoelectric mixed DisplayPort remote transmission device which comprises a Source end signal conversion module, a photoelectric mixed cable and a Sink end signal reduction module, wherein the output end of the Source end signal conversion module is connected with the input end of the Sink end signal reduction module through the photoelectric mixed cable, and a DP signal is input from the Source end signal conversion module and output from the Sink end signal reduction module. The invention also provides a photoelectric hybrid DisplayPort remote transmission method. The beneficial effects of the invention are as follows: the video and audio signal transmission device has the advantages of low cost scheme for stable transmission of video and audio signals under the ultra-long distance condition, low radiation, low power consumption, no need of debugging, high reliability and no need of an external power supply, and can be used by plug and play.
Description
Technical Field
The present invention relates to a transmission device, and more particularly, to a device and a method for remotely transmitting DisplayPort by photoelectric mixing.
Background
In recent years, with the rapid development of technology supporting high-definition digital multimedia interfaces, the application demands for remote transmission of high-definition digital multimedia information, such as large-screen high-definition LED liquid crystal televisions, high-definition projectors, commercial advertising screens, and the like, to remote display devices have also been rapidly increasing.
At present, a scheme based on an HDMI transmission protocol is widely used in engineering practice to solve the problem of remote transmission of high-definition digital signals, but the scheme has the following defects: firstly, the HDMI transmission protocol is protected by a patent, so that the use cost of the scheme is increased; secondly, because the I2C signal is used for carrying out communication handshake between the Source end and the Sink end, in order to avoid the phenomenon that the TTL level of the I2C is lost due to the slow change process of the high level and the low level when the remote transmission is carried out, the TTL level must be converted into a stronger signal or a differential signal to ensure the stability of the remote transmission, so that the power consumption of a power supply is inevitably increased; thirdly, because the three signals of R, G and B in the HDMI transmission protocol are consistent in the same clock period, the EMI is too high during transmission.
Therefore, the development of the multimedia signal remote transmission device which can ensure the remote transmission performance and has the advantages of simple use method and lower cost has high practical significance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a device and a method for remotely transmitting a DisplayPort by photoelectric mixing.
The invention provides a DisplayPort remote transmission device with photoelectric mixing, which comprises a Source end signal conversion module, a photoelectric mixing cable and a Sink end signal reduction module, wherein the output end of the Source end signal conversion module is connected with the input end of the Sink end signal reduction module through the photoelectric mixing cable, DP signals are input from the Source end signal conversion module, differential pair electrical signals in DP electrical signals are firstly converted into optical signals through the Source end signal conversion module, then the optical signals and control electrical signals are transmitted together for a remote distance through the photoelectric mixing cable, and finally the optical signals are reduced into differential pair electrical signals through the Sink end signal reduction module for downstream DP remote equipment.
As a further improvement of the invention, the input end of the Source end signal conversion module is connected with a DP signal Source, and the output end of the Sink end signal reduction module is connected with a DP remote device.
As a further improvement of the invention, the photoelectric hybrid cable comprises an outer sheath, wherein a shielding wire, an optical fiber unit, an electric unit and an aramid fiber filler are arranged in the outer sheath, the optical fiber unit is a four-core optical fiber unit and is used for transmitting optical signals converted from four groups of DP differential pair electrical signals, and the electric unit is used for transmitting control signals in the DP signals.
As a further improvement of the present invention, the shielding wire includes an aluminum foil shielding layer, a ground net and a communication wire, the four-core optical fiber unit includes a half-tight jacket and a colored optical fiber disposed within the half-tight jacket, and the electrical unit includes an insulating layer and a copper wire disposed within the insulating layer.
As a further improvement of the invention, the Source end signal conversion module comprises a Source end DP interface, a Source end direct current power supply circuit, a Source end ESD protection chip, an electro-optic conversion main circuit, an electro-optic conversion enabling control circuit and an optical signal transmitter, wherein the input end of the Source end direct current power supply circuit is connected with the Source end DP interface, the Source end direct current power supply circuit supplies power to the electro-optic conversion main circuit and the electro-optic conversion enabling control circuit respectively through output ends, the Source end ESD protection chip is connected with the input end of the electro-optic conversion main circuit, the output end of the electro-optic conversion enabling control circuit is connected with the input end of the electro-optic conversion main circuit, the output end of the electro-optic conversion main circuit is connected with the input end of the optical signal transmitter, the output end of the optical signal transmitter is connected with a four-core optical fiber unit of the photoelectric hybrid cable, and the electro-optic converted optical signal is transmitted to the input end of the Sink end signal reduction module through the four-core optical fiber unit.
As a further improvement of the present invention, the Sink side signal conversion module includes a Sink side DP interface, a Sink side dc power supply circuit, a Sink side ESD protection chip, a photoelectric conversion main circuit, a photoelectric conversion enabling control circuit, and an optical signal receiver, where an input end of the Sink side dc power supply circuit is connected to an output end of the Source side dc power supply circuit through an electrical unit of the photoelectric hybrid cable, the Sink side dc power supply circuit supplies power to the photoelectric conversion main circuit and the photoelectric conversion enabling control circuit through output ends respectively, the Sink side ESD protection chip is connected to an input end of the photoelectric conversion main circuit, an output end of the photoelectric conversion enabling control circuit is connected to an input end of the photoelectric conversion main circuit, an input end of the photoelectric conversion main circuit is connected to an output end of the optical signal receiver, and an output end of the photoelectric conversion main circuit is connected to the Sink side DP interface, and differential pair electrical signals obtained after being reduced by the photoelectric conversion main circuit are transferred to the downstream device through the Sink side DP interface.
The Source end signal conversion module comprises 2722 four-channel laser driving chips, the 2722 four-channel laser driving chips mainly comprise programming circuits, four electro-optic conversion amplifying circuits and four enabling logic units, the programming circuits are respectively connected with the four electro-optic conversion amplifying circuits, the programming circuits mainly comprise a memory controller and a temperature controller connected with the memory controller, the memory controller distributes storage space for various control parameters, the four enabling logic units respectively control the opening enabling of the four electro-optic conversion amplifying circuits, an enabling conversion channel is determined according to the voltage difference of differential pair signals, the output level of ACT1 and the input level of ACT0, the electro-optic conversion amplifying circuits firstly convert the input differential pair electrical signals into single-ended signals, then amplify the current difference of the single-ended signals, finally output the amplified signals to the optical signal emitters to be converted into optical signals with intensity difference, and finally output the optical signals to the optical signal emitters to the optical fiber units for remote transmission.
As a further improvement of the present invention, the optical signal transmitter includes four vertical cavity surface emitting lasers and a four-unit transmitting end 45-degree optical fiber array, the input end of the vertical cavity surface emitting laser is connected with the output end of the electro-optical conversion main circuit, the input end of the transmitting end 45-degree optical fiber array is connected with the output end of the vertical cavity surface emitting laser, and the output end of the transmitting end 45-degree optical fiber array is connected with the input end of the optical fiber unit. The vertical cavity surface emitting laser receives the single-ended signal output by the 2722 four-channel laser driving chip and converts the single-ended signal into a laser signal emitted perpendicular to the circuit board. The laser signal is reflected into a signal parallel to the circuit board by the 45-degree optical fiber array of the transmitting end and then enters the optical fiber unit for transmission.
As a further improvement of the present invention, the Sink end signal conversion module includes a 2712 transimpedance amplifier, the 2712 transimpedance amplifier is mainly composed of four input signal detection units, an optical signal intensity detection unit, four photoelectric reduction amplification circuits, an output amplitude level controller and four direct current compensation circuits, the input end of the photoelectric reduction amplification circuit is connected with the output end of the optical signal receiver, the input end of the input signal detection unit is connected with the output end of the optical signal receiver, the output end of the input signal detection unit is connected with the photoelectric reduction amplification circuit, the optical signal intensity detection unit is connected with the output end of the optical signal receiver, the output amplitude level controller is respectively connected with the four photoelectric reduction amplification circuits, the direct current compensation circuits are connected with the photoelectric reduction amplification circuits, wherein the optical signal intensity detection unit detects the intensity of an input signal by detecting the total current flowing through the optical signal receiver, the input signal detection unit controls whether the input signal is inputted or not, the input signal detection unit can control whether the optical signal is inputted or not, when the optical signal is inputted, the optical signal is inputted into the optical signal receiver, the differential amplifier is input through the differential amplifier, the differential amplifier is set up to realize the input to the differential amplifier, the differential amplifier is reset, the differential amplifier is set, the differential amplifier is input when the differential amplifier is turned on, the differential amplifier is realized, the differential amplifier is input, the differential amplifier is realized, and the differential amplifier is input by the differential amplifier is input, the direct current compensation circuit realizes that the amplitude of the differential pair actually output by the photoelectric reduction amplifying circuit is consistent with the preset amplitude through negative feedback.
As a further improvement of the present invention, the optical signal receiver includes four photodiodes and a four-unit receiving end 45-degree fiber array. The input end of the 45-degree optical fiber array is connected with the output end of the optical fiber unit, the output end of the 45-degree optical fiber array is connected with the input end of the photodiode, and the output end of the photodiode is connected with the input end of the photoelectric conversion main circuit. The optical signals output by the optical fiber unit enter the 45-degree optical fiber array at the receiving end and then become optical signals parallel to the circuit board, the signals are reflected by the 45-degree optical fiber array at the receiving end and then become photodiode input signals perpendicular to the circuit board, and the photodiodes convert the input optical signals into single-ended electrical signals and then output the single-ended electrical signals to the 2712 transimpedance amplifier for restoring the signals into differential pair signals required by downstream equipment.
The invention also provides a photoelectric hybrid DisplayPort remote transmission method, DP signals are input from a Source end signal conversion module, differential pair electrical signals in the DP electrical signals are firstly converted into optical signals through the Source end signal conversion module, then the optical signals and control electrical signals are transmitted together for a long distance through a photoelectric hybrid cable, and finally the optical signals are restored into differential pair electrical signals through a Sink end signal restoration module for downstream DP remote equipment.
The beneficial effects of the invention are as follows: through the scheme, the low-cost scheme for stably transmitting video and audio signals under the ultra-long distance condition is realized, the radiation is low, the power consumption is low, the debugging is not needed, the reliability is high, and the plug-and-play is not needed.
Drawings
Fig. 1 is a schematic diagram of a photoelectrically hybrid DisplayPort remote transmission device according to the present invention.
Fig. 2 is a schematic cross-sectional view of an optical-electrical hybrid cable of an optical-electrical hybrid DisplayPort remote transmission device according to the present invention.
Fig. 3 is a schematic diagram of an electro-optical conversion main circuit of a Source end signal conversion module of a photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 4 is a schematic diagram of an electro-optical conversion enabling control circuit of a Source end signal conversion module of a photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 5 is a schematic diagram of a Source DP interface of a Source signal conversion module of a mixed-electro-optical DisplayPort remote transmission device according to the present invention.
Fig. 6 is a schematic diagram of a Source-side ESD protection chip of a Source-side signal conversion module of a photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 7 is a schematic diagram of a Source-side dc power circuit of a Source-side signal conversion module of a mixed-electro-optical DisplayPort remote transmission device according to the present invention.
Fig. 8 is a schematic diagram of a photoelectric conversion main circuit of a Sink end signal reduction module of a photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 9 is a schematic diagram of a photoelectric conversion enabling control circuit of a Sink end signal reduction module of a photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 10 is a schematic diagram of a Sink-end DP interface of a Sink-end signal recovery module of a photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 11 is a schematic diagram of a Sink-side ESD protection chip of a Sink-side signal reduction module of a photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 12 is a schematic diagram of a Sink-side dc power circuit of a Sink-side signal reduction module of a photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 13 is a schematic workflow diagram of a 2722 four-channel laser driving chip of a photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 14 is a schematic diagram of the working flow of the 2712 transimpedance amplifier of the photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 15 is a flowchart of the operation of an optical signal transmitter of a photoelectric hybrid DisplayPort remote transmission device according to the present invention.
Fig. 16 is a flowchart of an optical signal receiver of an optical-electrical hybrid DisplayPort remote transmission device according to the present invention.
Detailed Description
The invention is further described with reference to the following description of the drawings and detailed description.
Referring to fig. 1, a schematic diagram of a photoelectric hybrid DisplayPort remote transmission device includes a Source end signal conversion module 100, a photoelectric hybrid cable 200, and a Sink end signal reduction module 300, where an output end of the Source end signal conversion module 100 is connected with an input end of the Sink end signal reduction module 300 through the photoelectric hybrid cable 200, an input end of the Source end signal conversion module 100 is connected with a DP signal Source, an output end of the Sink end signal reduction module 300 is connected with a DP remote device, and DP (Display Port) signals are input from the Source end signal conversion module 100 and output from the Sink end signal reduction module 300.
Referring to fig. 2, the optical-electrical hybrid cable 200 includes a four-core optical fiber unit 202, five electrical units 203, and a shielding wire 204, an aramid fiber filler 205, and an outer sheath 201, preferably a black polyurethane elastomer sheath, where the four-core optical fiber unit 202 is used for transmitting optical signals converted from four sets of DP differential pair electrical signals, the five electrical units 203 are used for transmitting five control signals in the DP signals, the shielding wire 204 includes an aluminum foil shielding layer 2041, a communication wire, and a ground network, the four-core optical fiber unit 202 includes a half-tight sleeve 2021 and a colored optical fiber 2022 disposed in the half-tight sleeve 2021, and the electrical unit 203 includes an insulating layer 2031 and a copper wire 2032 disposed in the insulating layer 2031.
Referring to fig. 3 to 7, the source side signal conversion module 100 uses 2722 four-channel laser driving chips as functional cores, and the whole module includes the following parts: the device comprises an electro-optical conversion main circuit, an electro-optical conversion enabling control circuit, a Source end DP interface, a Source end ESD protection chip, a Source end direct-current power supply circuit and an optical signal transmitter. The Source end direct current power supply circuit is respectively powered by the electro-optical conversion main circuit and the electro-optical conversion enabling control circuit through output ends, the Source end ESD protection chip is connected with the input end of the electro-optical conversion main circuit, the output end of the electro-optical conversion enabling control circuit is connected with the input end of the electro-optical conversion main circuit, the output end of the electro-optical conversion main circuit is connected with the input end of the optical signal transmitter, the output end of the optical signal transmitter is connected with the four-core optical fiber unit of the photoelectric hybrid cable, and the electro-optical signal after electro-optical conversion is transmitted to the input end of the Sink end signal reduction module through the four-core optical fiber unit. The Source end ESD protection chip selects RClamp0524, which can resist the transient voltage of + -8 KV and ensure enough safety margin. The Source-side dc power supply circuit selects the LDO power supply "SPX3819M5" and the switching power supply "M1541" to convert the input voltage "v_1" into "v_2" and "v_3", where "v_2" is the main power supply of the electro-optical conversion chip "2722" and the auxiliary power supply of the control chip "W104", and "v_3" is transmitted via the electrical unit 203 of the hybrid cable 200 to supply power to the Sink-side signal reduction module 300. Chip "W104" controls the enabling of the internal channels of main chip "2722" by controlling the output level of the "ACT1" pin and the input level of the "ACT0" pin.
Referring to fig. 8 to 12, the sink-side signal reduction module 300 uses a photoelectric conversion chip "2712" as a functional core, and the whole module includes the following parts: the device comprises a photoelectric conversion main circuit, a photoelectric conversion enabling control circuit, a Sink end DP interface, a Sink end ESD protection chip, a Sink end direct current power supply circuit and an optical signal receiver. The input end of the Sink-end direct current power supply circuit is connected with the output end of the Source-end direct current power supply circuit through an electric unit 203 of the photoelectric hybrid cable 200, the Sink-end direct current power supply circuit supplies power to the photoelectric conversion main circuit and the photoelectric conversion enabling control circuit through the output ends respectively, the Sink-end ESD protection chip is connected with the input end of the photoelectric conversion main circuit, the output end of the photoelectric conversion enabling control circuit is connected with the input end of the photoelectric conversion main circuit, the input end of the photoelectric conversion main circuit is connected with the output end of the optical signal receiver, the output end of the photoelectric conversion main circuit is connected with the Sink-end DP interface, and differential pair electric signals obtained after the photoelectric conversion main circuit is restored are transmitted to downstream equipment through the Sink-end DP interface together with DP control signals. The Sink-side ESD protection chip is selected from the same Source-side ESD protection chip. The Sink-end direct-current power supply circuit selects an LDO power supply 'SPX 3819M 5' and a switching power supply '3804' to convert an input voltage 'V_3' into 'V_4' and 'V_5', wherein 'V_4' is the main power supply of a photoelectric conversion chip '2712' and the auxiliary power supply of a control chip 'W104', and 'V_5' is the core power supply of the chip '2712'. Chip "W104" controls the enabling of the internal channels of main chip "2712" by controlling the levels of the "OL" pin and the "SD" pin. Four groups of differential pair electrical signals obtained through photoelectric reduction of the chip '2712' and other point control signals are used for DP remote equipment through a Sink-end DP interface.
Referring to fig. 13, a single channel of the 2722 four-channel laser driver chip supports data rates of 20Mbps to 12.5 Gbps. The chip mainly comprises a programming circuit 14, an electro-optical conversion amplifying circuit 15 and an enabling logic unit 16. The programming circuit 14 is composed of a memory controller and a temperature controller, wherein the memory controller allocates memory space for various control parameters. The four enable logic units 16 respectively control the on-enable of the four electro-optical conversion amplifying circuits, and determine the enable conversion channels according to the voltage difference of the differential pair signals, the output level of "ACT1" and the input level of "ACT 0". The electro-optical conversion amplifying circuit 15 converts the input differential pair electrical signal into a single-ended signal, amplifies the current difference of the single-ended signal, and outputs the amplified signal to the optical signal transmitter for converting into an optical signal with intensity difference and outputting to the optical fiber unit for remote transmission. Through programming the temperature controller, the chip can automatically adjust the output current according to the ambient temperature so as to keep the transmission performance of the optical signal in a high-level state all the time.
Referring to fig. 14, the 2712 transimpedance amplifier is a four-channel transimpedance amplifier integrated with a limiting amplifier, with a single channel supporting a data rate of 20Mbps to 12.5 Gbps. The chip mainly comprises an input signal detection 17, an optical signal intensity detection 15, a photoelectric reduction amplifying circuit 19, an output amplitude level controller 20 and a direct current compensation circuit 21. Wherein the optical signal intensity detection detects the intensity of an input signal by detecting a total current flowing through the optical signal receiver. The input signal detection 17 controls whether to start the photoelectric reduction amplifying circuit 19 according to whether a signal is input, and the photoelectric reduction amplifying circuit 19 enters a sleep mode when no signal is input so as to achieve the purposes of energy conservation and environmental protection. The input optical signal is converted into an electrical signal with weak current difference through the optical signal receiver, the current difference of the input signal is amplified through the photoelectric reduction amplifying circuit 19, and finally the electrical signal is reduced into a differential pair electrical signal which can be read by equipment. Setting the amplitude of the output differential pair signal can be achieved by performing register assignment on the output amplitude level controller 20, and the direct current compensation circuit 21 achieves that the actual differential pair amplitude output by the photoelectric reduction amplifying circuit is consistent with the preset amplitude through negative feedback, so that the stability and reliability of the output signal are ensured.
Referring to fig. 15, the optical signal transmitter includes four vcsels and a four-unit transmitting end 45-degree optical fiber array, wherein an input end of the vcsels is connected to an output end of the main electro-optic conversion circuit, an input end of the transmitting end 45-degree optical fiber array is connected to an output end of the vcsels, and an output end of the transmitting end 45-degree optical fiber array is connected to an input end of the optical fiber unit. The vertical cavity surface emitting laser receives the single-ended signal output by the 2722 four-channel laser driving chip and converts the single-ended signal into a laser signal emitted perpendicular to the circuit board. The laser signal is reflected into a signal parallel to the circuit board by the 45-degree optical fiber array of the transmitting end and then enters the optical fiber unit for transmission.
Referring to fig. 16, the optical signal receiver includes four photodiodes and a four-unit receiving-end 45-degree fiber array. The input end of the 45-degree optical fiber array is connected with the output end of the optical fiber unit, the output end of the 45-degree optical fiber array is connected with the input end of the photodiode, and the output end of the photodiode is connected with the input end of the photoelectric conversion main circuit. The optical signals output by the optical fiber unit enter the 45-degree optical fiber array at the receiving end and then become optical signals parallel to the circuit board, the signals are reflected by the 45-degree optical fiber array at the receiving end and then become photodiode input signals perpendicular to the circuit board, and the photodiodes convert the input optical signals into single-ended electrical signals and then output the single-ended electrical signals to the 2712 transimpedance amplifier for restoring the signals into differential pair signals required by downstream equipment.
The invention also provides a photoelectric hybrid DisplayPort remote transmission method, a DP signal is input from the Source end signal conversion module 100, the Source end signal conversion module 100 firstly converts a differential pair electrical signal in the DP electrical signal into an optical signal, then the optical signal and a control electrical signal are transmitted together for a remote distance through the photoelectric hybrid cable 200, and finally the optical signal is reduced into the differential pair electrical signal for downstream DP remote equipment through the Sink end signal reduction module 300.
The invention discloses a photoelectric hybrid DisplayPort remote transmission device, which firstly converts a differential pair electrical signal in a DP electrical signal into an optical signal through a Source end signal conversion module 100, then carries out remote transmission on the optical signal and a control electrical signal together through a photoelectric hybrid cable 200, and finally restores the optical signal into a differential pair electrical signal for downstream DP remote equipment through a Sink end signal restoration module 300. The device has the beneficial effects that: through the scheme, the defect that poor phenomena such as jitter and attenuation are easy to occur in the process of long-distance transmission of the DP differential pair electric signal, so that the transmission quality is influenced is effectively overcome, the low-cost scheme of stable transmission of video and audio signals under the ultra-long-distance condition is realized, debugging is not needed, the reliability is high, an external power supply is not needed, and the plug-and-play is realized.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (3)
1. A DisplayPort remote transmission device of photoelectric mixing, characterized by: comprises a Source end signal conversion module, an optical-electrical hybrid cable and a Sink end signal reduction module, wherein the output end of the Source end signal conversion module is connected with the input end of the Sink end signal reduction module through the optical-electrical hybrid cable, DP electric signals are input from the Source end signal conversion module, differential pair electric signals in the DP electric signals are firstly converted into optical signals through the Source end signal conversion module, then the optical signals and control signals in the DP electric signals are transmitted together in a long distance through the optical-electrical hybrid cable, finally, the optical signals are reduced into differential pair electric signals through the Sink end signal reduction module for downstream DP remote equipment, the input end of the Source end signal conversion module is connected with a DP signal Source, the output end of the Sink end signal reduction module is connected with the DP remote equipment, the optical-electrical hybrid cable comprises an outer sheath, the outer sheath is internally provided with a shielding wire, an optical fiber unit, an electric unit and an aramid fiber filler, the optical fiber unit is a four-core optical fiber unit and is used for transmitting optical signals converted from four groups of DP differential pair electrical signals, the electric unit is used for transmitting control signals in the DP electrical signals, the shielding wire comprises an aluminum foil shielding layer, a ground net and a communication wire, the four-core optical fiber unit comprises a semi-tight sleeve and a colored optical fiber arranged in the semi-tight sleeve, the electric unit comprises an insulating layer and a copper wire arranged in the insulating layer, the Source end signal conversion module comprises a Source end DP interface, a Source end direct current power supply circuit, a Source end ESD protection chip, an electro-optical conversion main circuit, an electro-optical conversion enabling control circuit and an optical signal transmitter, the input end of the Source end direct current power supply circuit is connected with the Source end DP interface, the Source end direct current power supply circuit supplies energy to the electro-optic conversion main circuit and the electro-optic conversion enabling control circuit through output ends respectively, the Source end ESD protection chip is connected with the input end of the electro-optic conversion main circuit, the output end of the electro-optic conversion enabling control circuit is connected with the input end of the electro-optic conversion main circuit, the output end of the electro-optic conversion main circuit is connected with the input end of the optical signal transmitter, the output end of the optical signal transmitter is connected with the four-core optical fiber unit of the photoelectric hybrid cable, the electro-optic converted optical signal is transmitted to the input end of the Sink end signal reduction module through the four-core optical fiber unit, the Sink end signal reduction module comprises a Sink end DP interface, a Sink end direct current power supply circuit, a Sink end ESD protection chip, a photoelectric conversion main circuit, a photoelectric conversion enabling control circuit and an optical signal receiver, the input end of the Sink-end direct current power supply circuit is connected with the output end of the Source-end direct current power supply circuit through the electric unit of the photoelectric hybrid cable, the Sink-end direct current power supply circuit supplies energy to the photoelectric conversion main circuit and the photoelectric conversion enabling control circuit through the output end respectively, the Sink-end ESD protection chip is connected with the input end of the photoelectric conversion main circuit, the output end of the photoelectric conversion enabling control circuit is connected with the input end of the photoelectric conversion main circuit, the input end of the photoelectric conversion main circuit is connected with the output end of the optical signal receiver, the output end of the photoelectric conversion main circuit is connected with the Sink-end DP interface, the differential pair electric signal obtained after the reduction of the photoelectric conversion main circuit is transmitted to downstream equipment through the Sink-end DP interface together with the DP control signal, the Sink-end signal reduction module comprises a 2712 transimpedance amplifier, the 2712 transimpedance amplifier mainly comprises four input signal detection units, an optical signal intensity detection unit, four photoelectric reduction amplifying circuits, an output amplitude level controller and four direct current compensation circuits, wherein the input end of the photoelectric reduction amplifying circuit is connected with the output end of the optical signal receiver, the input end of the input signal detection unit is connected with the output end of the optical signal receiver, the output end of the input signal detection unit is connected with the photoelectric reduction amplifying circuit, the optical signal intensity detection unit is connected with the output end of the optical signal receiver, the output amplitude level controller is respectively connected with the four photoelectric reduction amplifying circuits, the direct current compensation circuit is connected with the photoelectric reduction amplifying circuit, the optical signal intensity detection unit detects the intensity of an input signal by detecting the total current flowing through the optical signal receiver, the input signal detection unit controls whether to start the photoelectric reduction amplifying circuit according to whether a signal is input or not, the photoelectric reduction amplifying circuit enters a sleep mode when no signal is input, the input optical signal is firstly converted into an electric signal with weak current difference through the optical signal receiver, the current difference of the input signal is amplified through the photoelectric reduction amplifying circuit, and finally reduced into a differential pair electric signal which can be read by equipment, the amplitude of the output differential pair signal can be set by carrying out register assignment on the output amplitude level controller, and the direct current compensation circuit keeps the amplitude of the differential pair signal actually output by the photoelectric reduction amplifying circuit consistent with the preset amplitude through negative feedback.
2. The electro-optical hybrid DisplayPort remote transmission device according to claim 1, wherein: the Source end signal conversion module comprises 2722 four-channel laser driving chips, the 2722 four-channel laser driving chips mainly comprise programming circuits, four electro-optic conversion amplifying circuits and four enabling logic units, the programming circuits are respectively connected with the four electro-optic conversion amplifying circuits, the programming circuits mainly comprise a memory controller and a temperature controller connected with the memory controller, the memory controller distributes storage space for various control parameters, the four enabling logic units respectively control the opening enabling of the four electro-optic conversion amplifying circuits, an enabling conversion channel is determined according to the voltage difference of differential pair signals, the output level of ACT1 and the input level of ACT0, the electro-optic conversion amplifying circuits firstly convert the input differential pair electrical signals into single-ended signals, then amplify the current difference of the single-ended signals, and finally output the amplified signals to the optical signal transmitters for being converted into optical signals with intensity difference and being output to the optical fiber units for remote transmission.
3. A DisplayPort remote transmission method of photoelectric mixing is characterized in that: the DisplayPort remote transmission device based on the photoelectric mixture according to any one of claims 1 to 2 performs the following process, the DP signal is input from the Source end signal conversion module, the differential pair electrical signal in the DP electrical signal is firstly converted into the optical signal by the Source end signal conversion module, then the optical signal and the control electrical signal are transmitted together for a long distance through the photoelectric mixture cable, and finally the optical signal is reduced into the differential pair electrical signal by the Sink end signal reduction module for use by a downstream DP remote device.
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