CN113938621A - Computer screen display video loop-out method - Google Patents
Computer screen display video loop-out method Download PDFInfo
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- CN113938621A CN113938621A CN202111215369.0A CN202111215369A CN113938621A CN 113938621 A CN113938621 A CN 113938621A CN 202111215369 A CN202111215369 A CN 202111215369A CN 113938621 A CN113938621 A CN 113938621A
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- 238000006243 chemical reaction Methods 0.000 claims description 17
- 230000001360 synchronised effect Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2218/00—Aspects of pattern recognition specially adapted for signal processing
- G06F2218/12—Classification; Matching
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Abstract
The invention discloses a computer screen display video loop-out method, which relates to the field of video display processing and comprises the following steps: receiving a video signal, and converting the video signal into an LVDS format signal; video signal distribution: the screen video loop-out device distributes the LVDS format signals to form a first video signal and a second video signal; displaying the video; decoding the video signal: the screen video loop-out device decodes the second video signal to obtain a decoded video signal; video signal loop-out: the screen video loop-out device processes the decoded video signal to generate a loop-out video signal, and outputs the loop-out video signal to the video loop-out signal interface. The invention has the advantages that: the video loop-out method provided by the invention can realize the local display of the computer video and the video loop-out function, simplifies the signal processing flow, does not distinguish analog video signals or digital video signals, uniformly processes LVDS video signals, has high integration level and does not cause loss to the signals.
Description
Technical Field
The invention relates to the field of video display processing, in particular to a computer screen display video loop-out method.
Background
In computer video display applications, when a plurality of station screen display scenes at different positions are encountered, the display content on a screen of a remote display is required to be the same as that on a screen of a local display of a computer, and a duplicate display mode is often adopted. In order to keep the display of the local display consistent with that of the remote display, the system is designed to design the display to have the function of video signal loop-out, and the video signal output by the computer is used as the input of the local display and is received by the video loop-out device in the display. The video loop-out device not only provides a path of display signal for the display of the local display, but also provides a path of VGA signal with the same picture content for the remote display as input.
The method used by the current video loop-out device is to distribute the input computer video signals first and then to gate one path of the multi-path video signals for output. If the input is analog VGA video signal, an analog operational amplifier is generally adopted to distribute two paths of signals, wherein one path of signal is input to a VGA port of a main board of a local display, and the other path of signal is output to a video gate. If the input is DVI/HDMI digital video signal, the video decoder is adopted to convert the digital video signal into parallel code, the parallel code is redistributed into two paths, one path of the parallel code is recoded into DVI/HDMI signal for the digital video encoder and is input into a DVI/HDMI port of the local display mainboard, and the other path of the parallel code is converted into analog signal through the D/A converter and is output to the video gate. The method basically meets the requirements of local video display and video loop-out functions of computers in VGA and DVI/HDMI display formats, but has the disadvantages of complex signal processing flow, separate processing of analog video and digital video input, low integration level and easy analog signal distortion and poor digital signal integrity.
Disclosure of Invention
In order to solve the technical problems, the technical scheme provides a computer screen display video loop-out method, and solves the problems that the signal processing flow proposed in the background technology is complex, the input of analog video and digital video needs to be processed separately, the integration level is not high, and the distortion of analog signals and the deterioration of the integrity of digital signals are easily caused.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a computer screen display video loop-out method comprises a display mainboard, a screen video loop-out device and a display screen, and comprises the following steps:
video signal reception: the display main board receives the video signal output by the calculator, processes the video signal and then transmits the processed video signal to the screen video loop-out device;
video signal distribution: the screen video loop-out device distributes the video signals to form a first video signal and a second video signal;
and (3) video display: the screen video loop-out device transmits the first video signal to a display screen for displaying;
decoding the video signal: the screen video loop-out device decodes the second video signal to obtain a decoded video signal;
video signal loop-out: the screen video loop-out device processes the decoded video signal to generate a loop-out video signal, and outputs the loop-out video signal to the video loop-out signal interface.
Preferably, the video signal receiving includes the steps of:
the display main board judges the input video signal, if the judged video signal is a VGA analog signal, the VGA video signal is conditioned, the VGA analog is converted into a digital parallel code signal, and if the judged video signal is a DVI/HDMI digital video signal, the DVI/HDMI video decoding is converted into a digital parallel code signal;
the display mainboard converts the digital parallel code signal into an LVDS format signal through image processing and time sequence control, and transmits the LVDS format signal to the screen video output device.
Preferably, the video signal distribution comprises the steps of:
after receiving the LVDS format video signal, the screen video loop-out device inputs the received video signal into the LVDS signal distribution unit;
the LVDS signal distribution unit processes the input LVDS format video signal and outputs a first video signal and a second video signal, wherein the clock and data of the first video signal and the second video signal are the same as the input LVDS format video signal.
Preferably, the first video signal and the second video signal are both in LVDS format.
Preferably, the video signal decoding comprises the following specific steps: and the screen video loop-out device decodes the second video signal to obtain a decoded digital parallel code signal.
Preferably, the decoded digital parallel code signal includes 24-bit red, green and blue signals, 1 line sync signal, 1 field sync signal, 1 data enable signal and 1 blanking signal.
Preferably, the specific steps of looping out the video signal are as follows: the screen video loop-out device judges a video loop-out interface, if the video loop-out interface is a VGA interface, VGA signal conversion output is carried out, and DVI/HDMI signal coding output is carried out if the video loop-out interface is DVI/HDMI.
Preferably, the VGA signal conversion output specifically includes: the screen video loop-out device transmits a decoding digital parallel code signal to a video digital-to-analog conversion circuit, the video digital-to-analog conversion circuit receives the decoding digital parallel code signal, converts 24-bit red, green and blue signals into continuously-changed red, green and blue analog signals, outputs an enable signal and a blanking signal of the received synchronous signals into a line synchronous signal and a field synchronous signal in a VGA signal through a logic circuit, and outputs the converted VGA signal to a video loop-out interface.
Preferably, the DVI/HDMI signal encoding and outputting method specifically comprises the following steps: the screen video loop-out device transmits the decoded digital parallel code signal to a DVI/HDMI coding circuit, codes the decoded digital parallel code signal into a DVI/HDMI coding format, and outputs the coded digital parallel code signal to a video loop-out interface through a minimized transmission differential signal driver.
Compared with the prior art, the invention has the beneficial effects that: the video loop-out method provided by the invention converts the video signals into LVDS video signals before signal processing, does not distinguish analog video signals or digital video signals, uniformly processes the LVDS video signals, has high integration level, does not cause signal loss, greatly simplifies the video loop-out steps, improves the video loop-out processing efficiency, and can realize DVI/HDMI video loop-out without being limited to VGA video loop-out.
Drawings
FIG. 1 is a block diagram of the structure of the present invention;
FIG. 2 is a flow chart of a video loop-out method in the present invention;
FIG. 3 is a flow chart of video signal reception in the present invention;
FIG. 4 is a flow chart of video signal distribution in the present invention;
FIG. 5 is a flow chart of video signal looping-out in the present invention;
FIG. 6 is a circuit diagram of an on-screen video loop-out in the present invention;
FIG. 7 is a decoding circuit diagram of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
Referring to fig. 1, a computer screen display video loop-out screen includes a DVI video input interface 1, a VGA video input interface 2, a display main board 3, a display power supply 4, a screen video loop-out device 5, a display screen 6, and a video loop-out interface 7. The screen video loop-out device 5 further includes: the DC-DC unit 51, the LVDS signal distribution unit 52, the LVDS signal conversion unit 53, the DVI video input interface 1, the VGA video input interface 2 are respectively electrically connected with a DVI port and a VGA port of the display main board 3 for receiving video signals transmitted by a computer, the display power supply 4 is electrically connected with the display main board 3 for supplying power to the display main board 3, the screen voltage in the LVDS output end of the display main board 3 is connected to the power input end of the DC-DC unit 51, the LVDS signal at the LVDS output end of the display main board 3 is connected with the input end of the LVDS signal distribution unit 52, the power output end of the DC-DC unit 51 is connected with the power input end of the LVDS signal distribution unit 52 and the power input end of the LVDS signal conversion unit 53, the LVDS signal distribution unit 52 outputs two paths of LVDS signals, one path of LVDS signal is connected with the display screen 6, one path of LVDS signal is connected to the input terminal of the LVDS signal conversion unit 53, and the output terminal of the LVDS signal conversion unit 53 is connected to the video loop output interface 7.
Referring to fig. 2-7, a method for looping back video displayed on a computer screen includes a display main board, a screen video looping-back device and a display screen, and includes the following steps:
video signal reception: the display mainboard 3 receives the video signal output by the calculator through the DVI video input interface 1 or the VGA video input interface 2, processes the video signal and then transmits the processed video signal to the screen video loop-out device 5, and the video signal receiving comprises the following specific steps:
the display main board 3 judges the input video signal, if the judged video signal is a VGA analog signal, the VGA video signal is conditioned, VGA analog is converted into a digital parallel code signal, if the judged video signal is a DVI/HDMI digital video signal, DVI/HDMI video decoding is performed to convert the digital parallel code signal into the digital parallel code signal;
the display main board 3 converts the digital parallel code signal into an LVDS format signal through image processing and timing control, and transmits the LVDS format signal to the screen video loop-out device 5.
Video signal distribution: the LVDS signal distributing unit 52 in the screen video loop-out device 5 distributes the video signals to form a first video signal and a second video signal, and the video signal distribution specifically includes the following steps:
after receiving the video signal in LVDS format, the screen video looping-out device 5 inputs the received video signal into the LVDS signal distributing unit 52;
the LVDS signal distribution unit 52 processes the input LVDS format video signal and outputs a first video signal and a second video signal, the clock and data of the first video signal and the second video signal are the same as those of the input LVDS format video signal, and both the first video signal and the second video signal are in the LVDS format.
And (3) video display: the screen video loop-out device 5 transmits the first video signal to the display screen 6 for displaying;
decoding the video signal: the screen video loop-out device 5 decodes the second video signal to obtain a decoded video signal, and the video signal decoding specifically comprises the following steps: the screen video loop-out device decodes the second video signal to obtain a decoded digital parallel code signal, wherein the decoded digital parallel code signal comprises 24-bit red, green and blue signals, 1 line synchronous signal, 1 field synchronous signal, 1 data enable signal and 1 blanking signal.
Video signal loop-out: the LVDS signal conversion unit 53 in the screen video looping-out device 5 processes the decoded video signal to generate a looping-out video signal, and outputs the looping-out video signal to the video looping-out signal interface 7, where the video signal looping-out specifically includes the steps of: the screen video encircles and goes out the device and judges video ring and goes out the interface, if the video ring goes out the interface and is the VGA interface, then carries out VGA signal conversion output, and the video ring goes out the interface and then carries out DVI/HDMI signal coding output for DVI/HDMI, and VGA signal conversion output's concrete step is: the screen video loop-out device transmits a decoded digital parallel code signal to a video digital-to-analog conversion circuit, the video digital-to-analog conversion circuit receives the decoded digital parallel code signal, converts 24-bit red, green and blue signals into continuously-changed red, green and blue analog signals, and simultaneously outputs an enable signal and a blanking signal to a line synchronizing signal and a field synchronizing signal in a VGA signal through a logic circuit for the received synchronizing signal, the converted VGA signal is output to a video loop-out interface, and the DVI/HDMI signal coding output specifically comprises the following steps: the screen video loop-out device transmits the decoded digital parallel code signal to a DVI/HDMI coding circuit, codes the decoded digital parallel code signal into a DVI/HDMI coding format, and outputs the coded digital parallel code signal to a video loop-out interface through a minimized transmission differential signal driver.
In summary, the invention has the advantages that: the loop-out video method provided by the invention can realize the local video display and video loop-out functions of a computer, converts the video signals into LVDS video signals before signal processing, simplifies the signal processing flow, does not distinguish analog video signals or digital video signals, uniformly processes the LVDS video signals, has high integration level, does not cause signal loss, improves the processing efficiency of video loop-out, reduces the distortion degree of the loop-out video, is not limited to VGA video loop-out, can realize DVI/HDMI video loop-out, and improves the universality.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A computer screen display video loop-out method comprises a display mainboard, a screen video loop-out device and a display screen, and is characterized by comprising the following steps:
video signal reception: the display main board receives the video signal output by the calculator, processes the video signal and then transmits the processed video signal to the screen video loop-out device;
video signal distribution: the screen video loop-out device distributes the video signals to form a first video signal and a second video signal;
and (3) video display: the screen video loop-out device transmits the first video signal to a display screen for displaying;
decoding the video signal: the screen video loop-out device decodes the second video signal to obtain a decoded video signal;
video signal loop-out: the screen video loop-out device processes the decoded video signal to generate a loop-out video signal, and outputs the loop-out video signal to the video loop-out signal interface.
2. The computer screen display video loop-out method of claim 1, wherein the video signal receiving comprises the steps of:
the display main board judges the input video signal, if the judged video signal is a VGA analog signal, the VGA video signal is conditioned, the VGA analog is converted into a digital parallel code signal, and if the judged video signal is a DVI/HDMI digital video signal, the DVI/HDMI video decoding is converted into a digital parallel code signal;
the display mainboard converts the digital parallel code signal into an LVDS format signal through image processing and time sequence control, and transmits the LVDS format signal to the screen video output device.
3. The computer screen display video loop-out method of claim 2, wherein the video signal distribution comprises the following steps:
after receiving the LVDS format video signal, the screen video loop-out device inputs the received video signal into the LVDS signal distribution unit;
the LVDS signal distribution unit processes the input LVDS format video signal and outputs a first video signal and a second video signal, wherein the clock and data of the first video signal and the second video signal are the same as the input LVDS format video signal.
4. The computer screen display video loop-out method according to claim 3, wherein the first video signal and the second video signal are both in LVDS format.
5. The method as claimed in claim 4, wherein the video signal decoding comprises the following steps: and the screen video loop-out device decodes the second video signal to obtain a decoded digital parallel code signal.
6. The computer screen display video looping-out method of claim 5, wherein the decoded digital parallel code signal comprises 24-bit red, green and blue signals, 1 line synchronizing signal, 1 field synchronizing signal, 1 data enabling signal and 1 blanking signal.
7. The method of claim 6, wherein the video loop-out method comprises the following steps: the screen video loop-out device judges a video loop-out interface, if the video loop-out interface is a VGA interface, VGA signal conversion output is carried out, and DVI/HDMI signal coding output is carried out if the video loop-out interface is DVI/HDMI.
8. The method as claimed in claim 7, wherein the VGA signal conversion output comprises the following steps: the screen video loop-out device transmits a decoding digital parallel code signal to a video digital-to-analog conversion circuit, the video digital-to-analog conversion circuit receives the decoding digital parallel code signal, converts 24-bit red, green and blue signals into continuously-changed red, green and blue analog signals, outputs an enable signal and a blanking signal of the received synchronous signals into a line synchronous signal and a field synchronous signal in a VGA signal through a logic circuit, and outputs the converted VGA signal to a video loop-out interface.
9. The method of claim 7, wherein the DVI/HDMI signal encoding output comprises the following steps: the screen video loop-out device transmits the decoded digital parallel code signal to a DVI/HDMI coding circuit, codes the decoded digital parallel code signal into a DVI/HDMI coding format, and outputs the coded digital parallel code signal to a video loop-out interface through a minimized transmission differential signal driver.
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2021
- 2021-10-19 CN CN202111215369.0A patent/CN113938621B/en active Active
Patent Citations (7)
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| CN102419700A (en) * | 2011-09-28 | 2012-04-18 | 中国航天科工集团第二研究院七〇六所 | Video loop-out device for computers |
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