CN112311460B - DVI signal transmission device and method for self-adaptive 6-path 4-path optical fiber conversion - Google Patents
DVI signal transmission device and method for self-adaptive 6-path 4-path optical fiber conversion Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 102
- 239000013307 optical fiber Substances 0.000 title claims abstract description 84
- 230000008054 signal transmission Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000009467 reduction Effects 0.000 claims abstract description 16
- 238000012545 processing Methods 0.000 claims description 14
- 239000000835 fiber Substances 0.000 claims description 8
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
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Abstract
The invention provides a DVI signal transmission device and a DVI signal transmission method for self-adaptive 6-4-path optical fiber conversion, wherein the DVI signal transmission device comprises a host signal conversion module and a display signal reduction module, the host signal conversion module comprises a singlechip and a first photoelectric/electro-optical conversion chip, the singlechip is connected with the first photoelectric/electro-optical conversion chip, the display signal reduction module comprises a second photoelectric/electro-optical conversion chip, and the first photoelectric/electro-optical conversion chip is connected with the second photoelectric/electro-optical conversion chip through an optical fiber. The beneficial effects of the invention are as follows: the invention realizes DVI signal transmission of self-adaptive 6-path 4-path optical fiber conversion. The device has the I2C data transmission function in 6 paths of optical fibers and supports the DDC communication function in a transmission singlechip in 4 paths of optical fibers. The 6-path 4-path optical fiber switching device has the advantages of stable signal, no interference, high reliability and high cost performance.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a DVI signal transmission device and method for self-adaptive 6-path 4-path optical fiber conversion.
Background
DVI (Digital Visual Interface) is to transmit digital signals based on TMDS (Transition Minimized DIFFERENTIAL SIGNALING, transition minimum differential signal) technology. The TMDS encodes 8-bit data (each roadbed color signal in R, G, B) into 10-bit data (comprising row field synchronous information, clock information, data DE, error correction and the like) through minimum conversion by using an advanced encoding algorithm, and the data is transmitted by adopting differential signals after DC balance, so that the TMDS has better electromagnetic compatibility compared with LVDS and TTL.
At present, DVI signals can be transmitted in a long distance through an optical fiber line, so that TMDS signals, EDID signals and HPD signals are transmitted in the optical fiber, and the DVI signals have a DDC data transmission function and support a DDC communication function.
The DVI signal includes four TMDS differential signals (TMDS CHANNEL 0, TMDS CHANNEL 1, TMDS CHANNEL, TMDS Clock Channel) and two control signals (EDID, HPD). At present, the DVI signal optical fiber transmission mainly has two modes, and the first mode is to transmit DATA CHANNEL 0, DATA CHANNEL 1, DATA CHANNEL 2 and TMDS Clock Channel four-way TMDS signals by using 4-way optical fibers. However, EDID (SCL, SDA) and HPD control signals cannot be directly communicated between the display and the signal source through optical fibers, and the display can normally display only after the signal source needs to preprocess the control signals to read EDID and HPD information. The second mode is to transmit DATA CHANNEL, DATA CHANNEL 1, DATA CHANNEL, TMDS Clock Channel, EDID (SCL, SDA) and HPD six signals by using 6 paths of optical fibers, and the display and the signal source are in direct communication. The difference between the 6-path optical fiber transmission and the 4-path optical fiber transmission is that whether the control signals EDID (SCL, SDA) and HPD pass through the 2-path optical fibers or not is that the control signals are directly communicated with the signal source on the display.
Because the DVI optical fiber transmission technology develops rapidly, the limitation of 4-path optical fiber transmission modes is more and more obvious, the DDC transmission function cannot be realized, and the operation difficulty and the cost are high when the DVI optical fiber transmission technology is installed and used and maintained in the later period. Along with the development and popularization of DVI optical fiber transmission technology, the 6-path optical fiber transmission has obvious advantages, simple installation and operation and high cost performance. Today 4-way fiber modes face the risk of being eliminated by 6-way fiber transmission.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a DVI signal transmission device capable of self-adapting to 6-path 4-path optical fiber conversion, which can solve the problem that 4-path optical fiber products are updated with minimum cost and can be compatible to 6-path optical fibers for direct application.
The invention provides a DVI signal transmission device with self-adaptive 6-4-path optical fiber conversion, which comprises a host signal conversion module and a display signal recovery module, wherein the host signal conversion module comprises a singlechip and a first photoelectric/electro-optical conversion chip, the singlechip is connected with the first photoelectric/electro-optical conversion chip, the display signal recovery module comprises a second photoelectric/electro-optical conversion chip, and the first photoelectric/electro-optical conversion chip is connected with the second photoelectric/electro-optical conversion chip through an optical fiber.
As a further improvement of the invention, the DVI signal transmission device further comprises a signal source and a display, wherein the signal source is connected with the host signal conversion module, the display is connected with the display signal reduction module, and the host signal conversion module is connected with the display signal reduction module through an optical fiber; when 6 paths of optical fiber DVI signals are transmitted, the optical fibers are 6 paths of optical fiber lines; when 4-path optical fiber DVI signal transmission is carried out, the optical fibers are 4-path optical fiber lines.
As a further improvement of the invention, the signal source is connected with the host side signal conversion module through a DVI interface, and the display is connected with the display side signal reduction module through a DVI interface.
As a further improvement of the invention, the signal source comprises a host, an ultra-micro server, a projector, a display card and other signal output equipment.
As a further improvement of the invention, the display comprises a display device such as a television, a computer display or the like.
As a further improvement of the invention, when 6 paths of optical fiber DVI signals are transmitted, the single chip microcomputer detects that the HPD signal output by the first photoelectric/electro-optical conversion chip is high level, and the single chip microcomputer reads the EDID information of the display through the first photoelectric/electro-optical conversion chip, the optical fiber and the second photoelectric/electro-optical conversion chip and stores the EDID information in the single chip microcomputer; the single chip microcomputer changes HPD output by the first photoelectric/electro-optical conversion chip into low level setting time, and the signal source reads EDID information of a display stored in the single chip microcomputer; when 4 paths of optical fiber DVI signals are transmitted, the single chip microcomputer detects that the HPD signal output by the first photoelectric/electro-optical conversion chip is in a low level, the signal source reads default display EDID information stored in the single chip microcomputer, and if the signal source does not execute reading of the default display EDID information, the single chip microcomputer changes the HPD output by the first photoelectric/electro-optical conversion chip into a low level setting time and notifies the signal source to read the default display EDID information.
As a further improvement of the invention, the set time is 200ms.
The invention also provides a DVI signal transmission method of the self-adaptive 6-path 4-path optical fiber conversion, which comprises the following steps:
step 1: initializing a singlechip and entering a slave mode;
step 2: judging whether the first photoelectric/electro-optical conversion chip is connected with a signal source or not, if so, executing the step 3, otherwise, executing the step a;
Step 3: detecting whether the first photoelectric/electro-optical conversion chip reads an HPD signal of the display, if so, reading the EDID of the display by a signal source, otherwise, reading the default EDID of the singlechip by the signal source; returning to the execution step 2 after the execution of the step 3;
step a: detecting whether the first photoelectric/electro-optical conversion chip reads the HPD signal of the display, if so, outputting the HPD signal to the signal source, reading the EDID of the display, and then returning to the step 2, otherwise, executing the step b;
step b: setting an I2C module integrated in the singlechip into a host mode, and reading the EDID of a display;
step c: detecting whether the display I2C address is answered, if yes, executing a first processing step, otherwise, executing a second processing step;
A first processing step: reading the EDID of the display, writing the EDID into the singlechip, outputting an HPD signal to a signal source, and returning to the step 2;
And a second processing step: the I2C module enters a slave mode, outputs an HPD signal to the signal source, and returns to execute the step 2.
As a further development of the invention, in the first treatment step: the LED enters a blinking state, the EDID of the display is read, the EDID is written into the singlechip, the LED enters a long-lighting state, an HPD signal is output to a signal source, and the step 2 is executed in a return mode.
The beneficial effects of the invention are as follows: the invention realizes DVI signal transmission of self-adaptive 6-path 4-path optical fiber conversion. The device has the I2C data transmission function in 6 paths of optical fibers and supports the DDC communication function in a transmission singlechip in 4 paths of optical fibers. The 6-path 4-path optical fiber switching device has the advantages of stable signal, no interference, high reliability and high cost performance.
Drawings
FIG. 1 is a schematic block diagram of a 6-way optical fiber DVI signal transmission;
FIG. 2 is a schematic block diagram of a 4-way optical fiber DVI signal transmission;
FIG. 3 is a schematic diagram of a 6-way 4-way fiber conversion;
FIG. 4 is a flow chart of a 6-way 4-way fiber conversion;
Fig. 5 is a circuit schematic.
Detailed Description
The invention discloses a DVI signal transmission device capable of self-adapting 6-path 4-path optical fiber conversion, which utilizes a singlechip to control host (source) EDID/HPD signals, realizes the DDC transparent transmission function of the DVI digital signal 6-path optical fiber and can read and recover the EDID in a display by the host under the condition of 4-path optical fiber.
The invention discloses a DVI signal transmission device with self-adaptive 6-path and 4-path optical fiber conversion, which comprises a signal source, a host signal conversion module, a display signal restoration module and a display, wherein the signal source is equipment such as a host, an ultra-micro server, a projector, a display card and the like. The display is a display device such as a television, a computer display and the like. The signal source is connected with the host signal conversion module through a DVI interface, specifically, the signal source output interface is a DVI female head, and the signal input port of the host signal conversion module is a DVI male head, which are directly connected. The display is connected with the display end signal reduction module through a DVI interface, specifically, the display input interface is a female head, the signal output port of the display end signal reduction module is a DVI male head, and the display end signal reduction module and the DVI male head are directly connected.
The host side signal conversion module comprises a single chip microcomputer and a first photoelectric/electro-optical conversion chip (TX 06 chip), the single chip microcomputer is connected with the first photoelectric/electro-optical conversion chip, and the display side signal reduction module comprises a second photoelectric/electro-optical conversion chip (RX 06 chip).
As shown in fig. 1, when 6-path optical fiber DVI signal transmission is performed, the optical fibers are 6-path optical fiber lines; and 6-path optical fiber transmission of 4-path TMDS differential signals (TMDS CHANNEL 0, TMDS CHANNEL 1, TMDS CHANNEL 2 and TMDS Clock Channel) and 2-path control signals (EDID and HPD) is realized through signal control of a singlechip (MCU) and a first photoelectric/electro-optical conversion chip.
As shown in fig. 2, when 4-path optical fiber DVI signal transmission is performed, the optical fiber is a 4-path optical fiber line; 4 paths of TMDS differential signals (TMDS CHANNEL 0, TMDS CHANNEL 1, TMDS CHANNEL 2 and TMDS Clock Channel) are transmitted through single chip microcomputer signal control and a first photoelectric/electro-optical conversion chip. When 4 paths of optical fiber DVI signals are transmitted, the singlechip provides default EDID for a signal source (such as a display card). The output end of the host end signal conversion module and the input end of the display end signal reduction module are both fiber interface pigtails with 12 cores.
As shown in fig. 3, the conversion of the 6-path 4-path optical fiber is realized by processing two paths of control signals (EDID and HPD) by the singlechip. The 6-path 4-path optical fiber conversion principle is as follows: ⑴ When 6 paths of optical fiber DVI signals are transmitted, the single chip microcomputer detects that an HPD signal output by the first photoelectric/electro-optical conversion chip (TX 06 chip) is at a high level, and reads display EDID information through the first photoelectric/electro-optical conversion chip (TX 06 chip), the optical fiber and the second photoelectric/electro-optical conversion chip (RX 06 chip) by the DDC1 channel (I2C) and stores the display EDID information in the single chip microcomputer; and then the single chip microcomputer pulls down (changes the HPD output by the first photoelectric/electro-optical conversion chip into low level) for 200ms, and a signal source (display card) can read the EDID information of the display stored in the single chip microcomputer through a DDC2 channel. ⑵ When 4 paths of optical fiber DVI signals are transmitted, the single chip microcomputer detects that an HPD signal output by the first photoelectric/electro-optical conversion chip (TX 06 chip) is at a low level, and a signal source (display card) reads the EDID information of a default display stored in the single chip microcomputer through a DDC2 channel. If the signal source (display card) does not execute the reading of the default display EDID information, the single chip microcomputer pulls down (changes the HPD output by the first photoelectric/electric conversion chip into a low level) for 200ms, and notifies the signal source (display card) to read the default display EDID information.
As shown in fig. 5, the 6-way 4-way optical fiber conversion circuit is as follows:
And 6 paths of optical fiber transmission, namely outputting the T_HPD of the first photoelectric/electro-optical conversion chip U2 to be high level, controlling the transistor Q22 by the SOURCE_HPD_CONTROL of the single chip microcomputer U1 through the transistor Q32, and enabling a signal SOURCE (display card) to detect the change of a SOURCE_HPD level signal. When the output of the t_hpd of the first photoelectric/electro-optical conversion chip U2 is at a high level, the first photoelectric/electro-optical conversion chip U2 reads the display EDID information sent by the display (receives the display EDID information), and is connected with the t_hscl and the t_ HSDA of the single chip microcomputer U1 through the t_hscl and the t_ HSDA of the first photoelectric/electro-optical conversion chip U2, so that the single chip microcomputer U1 reads the display EDID information stored in the first photoelectric/electro-optical conversion chip U2 (TX 06 chip). The signal SOURCE (display card) reads the EDID information of the display stored in the singlechip U1 by controlling the singlechip U1 to pull down the SOURCE_HPD level signal.
4-Path optical fiber transmission: the output of the first photoelectric/electro-optical conversion chip U2 (TX 06 chip) T_HPD is low level, the T_HPD1 pin of the single chip microcomputer U1 is high level through the transistor Q32, and the transistor Q22 is controlled by the SOURCE_HPD_CONTROL pin of the single chip microcomputer U1 (MCU), so that the signal SOURCE (display card) detects the change of SOURCE_HPD level signals. When the output of the first photoelectric/electro-optical conversion chip U2 (TX 06 chip) T_HPD is at a low level, the DVI_SCL of the singlechip U1 (MCU) is converted by the Q29 level and then is output to the T_SCL of the CN 1; after the DVI_SDA of the singlechip U1 (MCU) is converted by the Q30 level, the DVI_SDA is output to the T_SDA of the CN 1; and finishing reading the default EDID of the singlechip by a signal source (display card).
Q29 and Q30 form an I2C bus 3.3V and 5V bidirectional level conversion circuit, wherein the ends T_SCL and T_SDA of CN1 are 5V levels, and the ends DVI_SCL and DVI_SDA are 3.3V levels.
The host signal transfer module mainly comprises: the device comprises a DVI interface (male head), an I2C level conversion circuit, a first photoelectric/electro-optical conversion chip (TX 06 chip), 5 VCSEL optical signal transmitters, 1 PD optical signal receiver, a tail fiber, a singlechip and the like.
The display end signal reduction module mainly comprises: the device comprises a DVI interface (male head), an I2C level conversion circuit, a second photoelectric/electro-optical conversion chip RX06 chip, 1 VCSEL optical signal transmitter, 5 PD optical signal receivers, a tail fiber and the like.
The invention also discloses a DVI signal transmission method of self-adaptive 6-path 4-path optical fiber conversion, as shown in FIG. 4, the EDID of the display is automatically read by a singlechip, and the method comprises the following steps:
Step 1: the singlechip is initialized, and SR4 is configured to enter a slave mode.
Step 2: judging whether the first photoelectric/electro-optical conversion chip (TX 06) is connected with a signal source (display card), detecting an internal POWER supply voltage by a single chip microcomputer U1 (MCU) INNER_POWER_CHECK pin through a transistor Q23, and when the single chip microcomputer U1 (MCU) detects a low level, indicating that the internal POWER supply voltage exists, and identifying that the first photoelectric/electro-optical conversion chip (TX 06) is connected with the signal source (display card); when the singlechip U1 (MCU) detects high level, the internal power supply voltage is not shown, and the first photoelectric/electro-optical conversion chip (TX 06) is determined to be not connected with a signal source (display card); if the first photoelectric/electric conversion chip (TX 06) is judged to be connected to a signal source (display card), executing step 3; if the first photoelectric/electric conversion chip (TX 06) is not connected with the signal source (display card), the step a is executed.
Step 3: detecting whether a first photoelectric/electro-optical conversion chip (TX 06 chip) reads an HPD signal of the display, if so, transmitting the HPD signal by using 6 paths of optical fibers at the moment, and reading the EDID of the display; if the TX06 chip does not detect the HPD signal from the display, the signal source (display card) reads the default EDID of the singlechip for 4-path optical fiber transmission. And returning to the execution step 2 after the execution of the step 3.
Step a: detecting whether the first photoelectric/electro-optical conversion chip reads the HPD signal of the display, if so, outputting the HPD signal to a signal source (display card), reading the EDID of the display, and then returning to the step 2; if the first photoelectric/electro-optical conversion chip does not read the HPD signal of the display, executing the step b.
Step b: and (3) connecting the host (source) to a display (receiving), setting an I2C module (MCU internal integration) in which a singlechip (MCU) communicates with a signal source (display card) (the signal source reads EDID information in the MCU) into a host mode, and reading the display EDID.
Step c: and detecting whether the display I2C address is answered, if yes, executing a first processing step, and otherwise, executing a second processing step.
A first processing step: the LED (D20) can enter a flashing state, the EDID of the display is read, the EDID is written into the singlechip, the LED enters a long-bright state, an HPD signal is output to the signal source, and the step 2 is executed in a return mode.
And a second processing step: the I2C module enters a slave mode, outputs an HPD signal to the signal source, and returns to execute the step 2.
The invention realizes DVI signal transmission of self-adaptive 6-path 4-path optical fiber conversion. The device has the I2C data transmission function in 6 paths of optical fibers and supports the DDC communication function in a transmission singlechip in 4 paths of optical fibers. The 6-path 4-path optical fiber switching device has the advantages of stable signal, no interference, high reliability and high cost performance.
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 (7)
1. The utility model provides a DVI signal transmission device of self-adaptation 6 way 4 way optic fibre conversion which characterized in that: the DVI signal transmission device comprises a host side signal conversion module and a display side signal reduction module, wherein the host side signal conversion module comprises a singlechip and a first photoelectric/electro-optical conversion chip, the singlechip is connected with the first photoelectric/electro-optical conversion chip, the display side signal reduction module comprises a second photoelectric/electro-optical conversion chip, the first photoelectric/electro-optical conversion chip is connected with the second photoelectric/electro-optical conversion chip through an optical fiber, the signal source is connected with the host side signal conversion module through a DVI interface, the display is connected with the display side signal reduction module through the DVI interface, the DVI signal transmission device further comprises a signal source and a display, the signal source is connected with the host side signal conversion module, the display is connected with the display side signal reduction module, and the host side signal conversion module is connected with the display side signal reduction module through an optical fiber; when 6 paths of optical fiber DVI signals are transmitted, the optical fibers are 6 paths of optical fiber lines; when 4-path optical fiber DVI signal transmission is carried out, the optical fibers are 4-path optical fiber lines.
2. A DVI signal transmission device according to claim 1, wherein: the signal source comprises a host, an ultra-micro server, a projector and a display card.
3. A DVI signal transmission device according to claim 1, wherein: the display comprises a television and a computer display.
4. A DVI signal transmission device according to claim 1, wherein: when 6 paths of optical fiber DVI signals are transmitted, the single chip microcomputer detects that an HPD signal output by the first photoelectric/electro-optical conversion chip is high level, and reads display EDID information through the first photoelectric/electro-optical conversion chip, the optical fiber and the second photoelectric/electro-optical conversion chip and stores the display EDID information in the single chip microcomputer; the single chip microcomputer changes HPD output by the first photoelectric/electro-optical conversion chip into low level setting time, and the signal source reads EDID information of a display stored in the single chip microcomputer; when 4 paths of optical fiber DVI signals are transmitted, the single chip microcomputer detects that the HPD signal output by the first photoelectric/electro-optical conversion chip is in a low level, the signal source reads default display EDID information stored in the single chip microcomputer, and if the signal source does not execute reading of the default display EDID information, the single chip microcomputer changes the HPD output by the first photoelectric/electro-optical conversion chip into a low level setting time and notifies the signal source to read the default display EDID information.
5. A DVI signal transmission device according to claim 4, wherein: the set time is 200ms.
6. A DVI signal transmission method for adaptive 6-way 4-way optical fiber conversion, applied to any one of the above claims 1 to 5, characterized by comprising the steps of:
step 1: initializing a singlechip and entering a slave mode;
step 2: judging whether the first photoelectric/electro-optical conversion chip is connected with a signal source or not, if so, executing the step 3, otherwise, executing the step a;
Step 3: detecting whether the first photoelectric/electro-optical conversion chip reads an HPD signal of the display, if so, reading the EDID of the display by a signal source, otherwise, reading the default EDID of the singlechip by the signal source; returning to the execution step 2 after the execution of the step 3;
step a: detecting whether the first photoelectric/electro-optical conversion chip reads the HPD signal of the display, if so, outputting the HPD signal to the signal source, reading the EDID of the display, and then returning to the step 2, otherwise, executing the step b;
step b: setting an I2C module integrated in the singlechip into a host mode, and reading the EDID of a display;
step c: detecting whether the display I2C address is answered, if yes, executing a first processing step, otherwise, executing a second processing step;
A first processing step: reading the EDID of the display, writing the EDID into the singlechip, outputting an HPD signal to a signal source, and returning to the step 2;
And a second processing step: the I2C module enters a slave mode, outputs an HPD signal to the signal source, and returns to execute the step 2.
7. A DVI signal transmission method according to claim 6, wherein: in the first processing step: the LED enters a blinking state, the EDID of the display is read, the EDID is written into the singlechip, the LED enters a long-lighting state, an HPD signal is output to a signal source, and the step 2 is executed in a return mode.
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| CN203301663U (en) * | 2013-05-31 | 2013-11-20 | 深圳市载德光电技术开发有限公司 | DVI signal multimode single-optical-fiber transmitter |
| CN205847279U (en) * | 2016-07-28 | 2016-12-28 | 长沙威胜信息技术有限公司 | Optical fiber RS485 chromacoder |
| CN108183749A (en) * | 2017-12-20 | 2018-06-19 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of fiber optic communications devices of DVI videos and communication signal mixed transport |
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