CN104469353B - A kind of device detecting LVDS video signal quality - Google Patents
A kind of device detecting LVDS video signal quality Download PDFInfo
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Abstract
The invention belongs to display field and the field tests of liquid crystal module, be specifically related to a kind of device detecting LVDS video signal quality.It includes for receiving the LVDS transport module that its operation that is terminated, electrical characteristic to the LVDS video signal after terminated operation are detected by LVDS video signal, RGB block is turned, for the RGB data detection module that the view data of LVDS video signal is detected with for sending the detection control module of parameter and control signal for LVDS video signal being converted into the LVDS of rgb video signal.Single LINK that video source produces, double LINK, the LVDS video signal of four LINK can be detected by the present invention, simple to operate, economical and practical, not only integrated level is high, reliable operation, capacity of resisting disturbance are strong, and detection reliability and the efficiency of LVDS liquid crystal module can also be promoted, reduce its equipment cost and production cost.
Description
Technical field
The invention belongs to display field and the field tests of liquid crystal module, be specifically related to a kind of detection LVDS
The device of video signal quality.
Background technology
Liquid crystal display module (Liquid Crystal Display Module, hereinafter referred to as module) and phase thereof
The use of the liquid crystal display (hereinafter referred to as equipment) closed is the most universal, as well as LVDS
(Low-Voltage Differential Signaling, Low Voltage Differential Signal) signal stabilization is reliable, pass speed
Rate is high, power consumption is relatively low, and a lot of modules and equipment are all by using this signal as receiving video image
Display interface.
Carry out producing at module and equipment thereof, debug, videograph process time need to pass through video signal
Source or video adapting plate (being the most all called for short video source) produce LVDS video signal and provide module to it
The source of display signal, thereby, it is ensured that the video signal correctness of video source generation and reliability are to ensure
The premise of module displays.
At present, market there is no unified standard for video source field and guarantee the LVDS video letter of output
Number correctness, reliability, to video source output picture signal detection all by human eye to being shown
The image pixel shown identifies one by one, manually cuts figure and persistently judges.This detection mode operator are not only
Easily erroneous judgement, is difficult to localized reason place when there is display problem；And it is easy by eye recognition
By the subjective impact of people, operator are for a long time facing to image, and eyes are the most tired, and these all can be right
Testing result impacts；Need to again build test platform when changing module, thus cause efficiency low
Under, complex operation.
It is thus desirable to a kind of technical scheme can LVDS reliable, errorless, that produce video source efficiently
Picture signal detects, it is not necessary to artificially judge.
Summary of the invention
The purpose of the present invention is contemplated to solve the deficiency that above-mentioned background technology exists, it is provided that a kind of detection
The device of LVDS video signal quality, it is high, without erroneous judgement, simple to operate, detection effect that it has reliability
Rate is high, the feature of low cost.
The technical solution used in the present invention is: a kind of device detecting LVDS video signal quality, bag
Include:
For the electrical characteristic of LVDS video signal is sampled, obtain LVDS video signal
Electric parameter and LVDS electric parameter benchmark carry out the LVDS transport module of comparison and detection；
RGB block is turned for LVDS video signal being converted into the LVDS of rgb video signal；
For every frame RGB data to be carried out successively comparison and detection with raw image data, output electrically inspection
Survey consequential signal and the RGB data detection module of view data testing result signal；
For sending control parameter and control signal, reception electric testing result signal and view data inspection
Survey the detection control module of consequential signal.
The control end of described detection control module connects described LVDS transport module and RGB data respectively
The control end of detection module, the data output end of described detection control module connects described LVDS respectively
Transport module and LVDS turn the data receiver of RGB block, the first of described LVDS transport module
Outfan connects LVDS and turns the input of RGB block, the second outfan described RGB data of connection
Second input of detection module, described LVDS turns the outfan of RGB block and connects RGB data
The first input end of detection module, the outfan of described RGB data detection module connects detection and controls mould
The signal receiving end of block.
Further, described LVDS transport module includes:
Matching module is transmitted for the LVDS of operation that LVDS video signal is terminated；
LVDS signal for the electrical characteristic of LVDS video signal is sampled electrically sample with
Quantization modules；
For the electrical value of the LVDS video signal of sampling is carried out with LVDS electric parameter benchmark
The electric detection module of LVDS of comparison and detection；
The outfan of described LVDS transmission matching module connects described LVDS signal and electrically samples and measure
Change module input, the data output end of the data receiver described detection control module of connection, described
The LVDS signal outfan with quantization modules of electrically sampling is connected the input of the electric detection module of LVDS
End, the outfan of the electric detection module of LVDS connects the second input of described RGB data detection module
End, control end connect the control end of described detection control module.
Further, described LVDS transport module also includes for the LVDS after the operation that is terminated
Video signal carries out the LVDS signal shaping module of shaping processing and amplifying, and its input connects described
The LVDS transmission outfan of matching module, outfan connect as the first outfan of LVDS transport module
Meet described LVDS and turn the input of RGB block.
Further, described LVDS turns RGB block and includes:
For LVDS video signal is demodulated, adjusts receiving the LVDS video signal solution of line sequence
Mode transfer block；
Believe for LVDS decoding video signal being converted into the LVDS video of rgb video signal
Number decoder module；
The input of described LVDS video signal demodulation module connects the of described LVDS transport module
One outfan, outfan connect the input of described LVDS video signal decoder module, described LVDS
Video signal decoder module outfan connects the first input end of described RGB data detection module, described
The data receiver of LVDS video signal demodulation module and LVDS video signal decoder module is all connected with
The data output end of described detection control module.
Further, described RGB data detection module includes:
For caching every frame RGB data successively, it is sequentially output the every frame RGB data cached simultaneously
Rgb signal buffer control module；
For caching every width raw image data successively, it is sequentially output the every width original graph cached simultaneously
Original image buffer control module as data；
A line RGB data and a line raw image data for reading carry out synchronizing relay behaviour
Make so that it is the Data Detection fifo module of synchronism output；
For every frame RGB data is carried out the RGB data of comparison and detection with raw image data successively
Detection module；
Defeated for receiving the signal detecting result of RGB data testing result and the electric testing result of LVDS
Go out module；
The input of described rgb signal buffer control module connects described LVDS and turns RGB block
Outfan, outfan and control end connect input and the RGB of described Data Detection fifo module respectively
The control signal system end of data detection module, the input of original image buffer control module connects described inspection
Survey the outfan of control module, outfan and control end and connect described Data Detection fifo module respectively
The control signal end of input and RGB data detection module, described Data Detection fifo module defeated
Go out end and connect the input of described RGB data detection module, described RGB data detection module defeated
Go out the input of the end described signal detecting result output module of connection, control end connects described detection and controls
The control end of module, the outfan of described signal detecting result output module connects described detection and controls mould
The signal receiving end of block.
Further, described RGB data detection module also includes:
For alternately storing the RGB frame of every frame RGB data of rgb video signal data buffer storage successively
Data buffer storage the first module and RGB frame data buffer storage the second module, for the most alternately storing original graph
As the initial data image of every width raw image data of buffer control module caching cache the first module and
Initial data image caches the second module；
The data of described RGB frame data buffer storage the first module and RGB frame data buffer storage the second module connect
Receiving end connects the data of rgb signal buffer control module respectively and processes end；
Described initial data image caches the first module and initial data image caches the data of the second module
Receiving terminal connects the data of original image buffer control module respectively and processes end.
Further, described detection control module includes:
For receiving the control Ethernet of parameter, RS232, RS485 interface module；
For receiving USB, SD card interface module of raw image data；
For sending control parameter and control signal, reception electric testing result signal and view data inspection
Survey the upper-layer configured module of consequential signal,
The control end of described upper-layer configured module is as the control end of detection control module, upper-layer configured mould
The data output end of block is as the data output end of detection control module, the letter of described upper-layer configured module
Number receiving terminal connects the outfan of described RGB data detection module, described upper-layer configured module input
Connect described Ethernet, RS232, RS485 interface module and USB, SD card interface module respectively
Outfan.
The invention has the beneficial effects as follows:
Single LINK that video source can be produced by the present invention, double LINK, the LVDS video of four LINK
Signal detects, the present invention by arrange, can well adapt in different LVDS transmission characteristics,
The different qualities such as the color range of video signal, transmission means, coded system.
The electrical characteristic of the LVDS video signal that video source produces can be detected by the present invention, passes through
Input LVDS electric parameter standard, obtains testing result output display through comparison in the present invention.
The present invention can be to the view data detection of the LVDS video signal that video source produces, by advance
Cache every frame image data also to contrast with raw video image, thus judge whether each pixel exports
Correctly, every two field picture all can detect.
The present invention can be to the highest LVDS video resolution detection, and not only integrated level is high, reliable operation,
Capacity of resisting disturbance is strong, and simple to operate, economical and practical, can not only promote LVDS liquid crystal module
Detection reliability and efficiency, reduce its equipment cost and production cost, also will further improve relevant aobvious
Show the universal of equipment.
The present invention can be by with FPGA (field programmable logic array) chip, DDR (Double Date
Rate double data rate) storage chip, A/D (analog/digital) conversion chip realize described all
Function；Above-mentioned device is all the common chip in market, they not only working stability, realize easily, and
Low price, it is to avoid the design complexity, the poor stability that cause because using various special chips, set
Meter high in cost of production problem.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the present invention.
Fig. 2 is the circuit block diagram that in Fig. 1, LVDS transport module and LVDS turn RGB block.
Fig. 3 is the circuit block diagram of RGB data detection module in Fig. 1.
Fig. 4 is the circuit block diagram detecting control module in Fig. 1.
In figure: 1-LVDS transport module, 11-LVDS transmits matching module, 12-LVDS signal shaping
Module；13-LVDS signal is electrically sampled and quantization modules；The electric detection module of 14-LVDS；
2-LVDS turns RGB block, 21-LVDS video signal demodulation module, and 22-LVDS video is believed
Number decoder module；
3-RGB data detection module, 31-RGB signal buffer control module, 32-RGB frame data delay
Depositing the first module, 33-RGB frame data cache the second module, 34-original image buffer control module,
35-initial data image caches the first module, and 36-initial data image caches the second module, 37-RGB
Data detection module, 38-signal detecting result output module, 39-Data Detection fifo module；
4-detects control module, 41-Ethernet, RS232, RS485 interface module, 42-USB, SD
Card interface module, 43-upper-layer configured module.
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings, it is simple to clear
The present invention is understood on ground, but they do not constitute restriction to the present invention.
As Figure 1-4, the device of the detection LVDS video signal quality of the present invention includes: LVDS
Transport module 1, LVDS turns RGB block 2, RGB data detection module 3 and detection control module 4.
The control end of detection control module 4 connects LVDS transport module 1 and RGB data detection module respectively
The control end of 3, the data output end of detection control module 4 connects LVDS transport module 1 He respectively
LVDS turns the data receiver of RGB block 2, and the first outfan of LVDS transport module 1 connects
LVDS turns the input of RGB block 2, the second outfan connects the of RGB data detection module 3
Two inputs, LVDS turns the outfan of RGB block 2 and connects the first of RGB data detection module 3
Input, the outfan of RGB data detection module 3 connects the signal receiving end of detection control module 4.
LVDS transport module 1, is used for receiving LVDS video signal to its operation that is terminated, opposite end
The electrical characteristic connecing the LVDS video signal after operation is sampled, and obtains LVDS video signal
Electric parameter and LVDS electric parameter benchmark carry out comparison and detection, export electric testing result signal.
LVDS transport module includes 1:
LVDS transmits matching module 11, for mating impedance parameter to reception according to the LVDS received
To LVDS video signal be terminated operation, to make great efforts more chaotic signal video source produced
Revert to tested LVDS video signal, the LVDS video signal after then being processed by terminated operation
Being sent to LVDS signal electrically sample and quantization modules, described terminated operation includes that LVDS signal hinders
Anti-coupling, LVDS signal equalization configure, and compensate the signal distortion because long range propagation is caused, decay,
Guarantee LVDS signal quality.
LVDS signal shaping module 12, for entering the LVDS video signal after the operation that is terminated
Row shaping processing and amplifying, obtains optimal signal quality, it is to avoid follow-up signal conversion and detection occur by mistake
Sentence, be then output to LVDS and turn RGB block.
LVDS signal is electrically sampled and quantization modules 13, for the voltage of LVDS video signal,
The electrical characteristics such as electric current are sampled, and the signal (analog quantity) will sampled by AD conversion chip
Quantify, be i.e. converted into different size of numeral bit value.
The electric detection module of LVDS 14, for receiving the LVDS electricity that detection control module sends
After gas detection control signal and LVDS electric parameter benchmark, by the electric number of the LVDS signal of sampling
Value contrasts with LVDS electric parameter benchmark, if LVDS sample magnitude is at LVDS electric parameter
Then represent between the maxima and minima of benchmark that LVDS video signal electrical quality is up to standard, be otherwise
Failure.Then testing result (whether up to standard i.e. tabulating which parameter) is given signal detection knot
Really output module 38, module 43 is given and via Ethernet, RS232, RS485 interface in a road afterwards
Module 41 returns to PC display result, and another road produces and shows that signal feeding carries display screen 5 and shows
Illustrate.
The outfan of LVDS transmission matching module 11 connects LVDS signal and electrically samples and quantization modules
13 inputs, data receiver connect the data output end of detection control module 4, and described LVDS believes
Number electric sampling is connected the input of the electric detection module of LVDS 14 with the outfan of quantization modules 13,
The outfan of the electric detection module of LVDS 14 connect RGB data detection module 3 the second input,
Control end and connect the control end of described detection control module 4, the input of LVDS signal shaping module 12
End connects the LVDS transmission outfan of matching module 11, outfan connects LVDS and turns RGB block 2
Input.
LVDS turns RGB block 2, for LVDS video signal is converted into rgb video signal；
LVDS turns RGB block 2 and includes:
LVDS video signal demodulation module 21, for LVDS electrically detect up to standard after, according to upper
LVDS video after carrying out shaping processing and amplifying is believed by the LVDS demodulation parameter that layer configuration module sends
Number carry out the demodulation of LVDS Dan Shuansi LINK signal, adjust and receive line sequence, by LVDS video signal
Serialized encoded data be demodulated to parallel data；
LVDS video signal decoder module 22, for the video decoding sent according to upper-layer configured module
The parallel data of LVDS video signal is decoded by parameter, according to 6bit, 8bit, 10bit image pane
Formula, VESA/JIEDA standard handovers become standard rgb video signal (i.e. VSYNC, HSYNC,
DE、DATA)。
The first of the input connection LVDS transport module 1 of LVDS video signal demodulation module 21 is defeated
Go out end, the input of outfan connection LVDS video signal decoder module 22, LVDS video signal
Decoder module 22 outfan connects the first input end of RGB data detection module 3, and LVDS video is believed
The data receiver of number demodulation module 21 and LVDS video signal decoder module 22 is all connected with detection control
The data output end of molding block 4.
RGB data detection module 3, for the view data detection control sent according to upper-layer configured module
Signal processed caches every frame RGB data of rgb video signal successively, reads according to original image and controls
Signal caching raw image data, carries out contrast inspection successively by every frame RGB data with raw image data
Survey, export electric testing result signal and view data testing result signal；
RGB data detection module 3 includes:
Rgb signal buffer control module 31, for caching every frame RGB successively according to operating control signal
Data, are sequentially output the every frame RGB data cached simultaneously；
RGB frame data buffer storage the first module 32 and RGB frame data buffer storage the second module 33, be used for depending on
Every frame RGB data of secondary alternately storage rgb signal buffer control module 31 caching；
Original image buffer control module 34, caches successively for reading control signal according to original image
Every width raw image data, is sequentially output according to the operating control signal of RGB data detection module simultaneously
The every width raw image data cached；
Initial data image caches the first module 35 and initial data image caches the second module 36, is used for
Every width raw image data that alternately storage original image buffer control module 34 caches successively.
Data Detection fifo module 39, for by a line RGB data read and a line original graph
As data carry out synchronizing relay operation so that it is synchronism output；
RGB data detection module 37, for according to the view data detection control signal pair received
Rgb signal buffer control module and original image buffer control module send operating control signal, simultaneously
According to original image resolution, every frame RGB data is carried out comparison and detection with raw image data successively,
The object of detection includes each pixel size and the location of pixels of RGB data.
Signal detecting result output module 38, for receiving the RGB of RGB data detection module output
Data Detection result and the electric testing result of LVDS of LVDS electric detection module output, and send
Testing result signal gives detection control module.
The input of rgb signal buffer control module 31 connects LVDS and turns the output of RGB block 2
End, outfan and control end connect input and the RGB of described Data Detection fifo module 39 respectively
The control signal end of data detection module 37, the input of original image buffer control module 34 connects
The detection data output end of control module 4, outfan and control end connect described Data Detection respectively
The input of fifo module 39 and the control signal end of RGB data detection module 37, Data Detection
The outfan of fifo module 39 connects the input of RGB data detection module 37, described RGB number
According to the outfan of detection module 37 connect the input of described signal detecting result output module 38, the
One controls end connects the control end of detection control module 4, the output of signal detecting result output module 38
End connects the signal receiving end of detection control module 4.RGB frame data buffer storage the first module 32 and RGB
Frame data cache the data receiver of the second module 33 and connect rgb signal buffer control module 31 respectively
Data process end.Initial data image caches the first module 35 and initial data image caches the second mould
The data receiver of block 36 connects the data of original image buffer control module 34 respectively and processes end.
Detection control module 4, be used for sending electrically detection control signal and LVDS electrical reference parameter to
LVDS transport module；Conciliation parameter and decoding parametric is sent for turning RGB block to LVDS；With
In send view data detection control signal, original image read control signal, raw image data and
Original image resolution is to RGB data detection module, and receives electric testing result signal and picture number
According to testing result signal.
Detection control module 4 includes:
Ethernet, RS232, RS485 interface module 41, be used for receiving LVDS electric parameter benchmark,
LVDS transmission match parameter, LVDS reconcile parameter and video decoding parametric, and the present invention is on PC upper strata
Software arranges LVDS transmission match parameter (termination impedance, equilibrium), LVDS electrical reference parameter
(maximum voltage, minimum voltage, excessively punching, undershoot, electric current etc.), LVDS demodulation parameter (Dan Shuansi
LINK number, transmission line sequence), LVDS decoding parametric (RGB-6/8/10bit, video decoding standards
(VISA/JIDEA)), tested image level resolution, vertical resolution (are also the resolutions of original image
Rate).After detection device starts, Ethernet, RS232, RS485 interface module 41 input above-mentioned containing
PC is had to control the Ethernet of parameter, rs 232 serial interface signal and recover its parameter feeding upper-layer configured module 43.
USB, SD card interface module 42, for LVDS electrically detect up to standard after, receive original graph
As data send into upper-layer configured module 43；
Upper-layer configured module 43, for when LVDS electrically detects send LVDS coupling impedance parameter,
Electrically detection control signal and LVDS electrical reference parameter are to LVDS transport module；In electrically detection
After up to standard, for PC will be received control parameter distribution from Ethernet, RS232, RS485 interface module
To other functional modules, i.e. send conciliation parameter and decoding parametric turns RGB block to LVDS；With
In send view data detection control signal, original image read control signal, raw image data and
Original image resolution is to RGB data detection module.
The control end of upper-layer configured module 43 is as detection the control end of control module 4, data output end
As the data output end of detection control module 4, the signal receiving end of described upper-layer configured module 43 is even
Connecing the outfan of described RGB data detection module 3, upper-layer configured module 43 input connects respectively
Described Ethernet, RS232, RS485 interface module 41 and USB, SD card interface module 42 defeated
Go out end.
The process that the employing present invention detects the LVDS video signal quality that frequency source produces is as follows:
Step 1, detected video source reads original image and produces LVDS video signal and be output to
The LVDS transport module 1 of the present invention.
Step 2, arranges control parameter in PC, and PC controls parameter and arranges and be detected video source
Identical, send into detection control module 4 by Ethernet or RS232, RS485 Serial Port Line.
Step 3, after apparatus of the present invention start, Ethernet, RS232, RS485 interface module 41 connect
Receive above-mentioned containing PC control the Ethernet of parameter, rs 232 serial interface signal and recover its parameter send into upper-layer configured
Module 43.PC controls upper-layer configured module 43 and is distributed to other each functional modules.When each merit
After energy module completes relative set and initializes, upper-layer configured module 43 produces LVDS and electrically detects control
Signal processed is to the electric detection module of LVDS 14, first the most special to the LVDS signal of detected video source
Property detection.Picture number is carried out again when electric testing result is in the range of LVDS electrical reference parameter
According to detection.
Step 4, LVDS video signal is inputted and detects by LVDS transport module 1.LVDS transmits
Matching module 11 carries out signal according to the LVDS coupling impedance parameter that upper-layer configured module 43 exports and connects
Receive impedance matching, receive equilibrium allocation, to make great efforts to revert to tested video signal.LVDS signal is electric
Sample and the electrical characteristics such as the voltage of LVDS video signal, electric current sampled by quantization modules 13,
And by AD conversion chip, institute's sampled signal (analog quantity) is quantified, i.e. it is converted into different big
Little digital bit value.The electric detection module of LVDS 14 is by each LVDS sample magnitude and LVDS
Electric parameter benchmark is compared, and exports the electric testing result of LVDS.
Step 5, after upper-layer configured module 43 obtains the electric testing result of LVDS, if up to standard, from
Row starts view data detection and controls to RGB data detection module 3 so that it is receive rgb video signal
View data automatically detect；Otherwise wait for PC and do next step instruction, be to continue with detecting data still
Again detection LVDS video electric signal.When LVDS is the most up to standard, then LVDS signal shaping mould
Block 12 carries out shaping amplification, to reach optimum signal quality to the LVDS video signal of input, it is to avoid
There is erroneous judgement in follow-up signal conversion and detection.
Step 6, after LVDS is the most up to standard, upper-layer configured module 43 is automatically by USB, SD
Card interface module 42 reads original image (original image and detected video source are same image) and produces
Raw original image reads control signal makes it cache this image to original image buffer control module 34.Former
This original image is first cached to initial data image and caches the first module by beginning image buffer storage control module 34
In 35, then it is cached to initial data image when detecting next width original image and caches the second module 36,
These two modules are done ping-pong operation and use high speed DDR storage chip, thus can be without the real-time inspection paused
Survey different images data.
Step 7, LVDS video signal demodulation module 21 receives orthopedic LVDS signal basis
The configuration parameter that upper-layer configured module 43 sends carries out the demodulation of LVDS Dan Shuansi LINK signal, adjusts
Receive line sequence.The video solution that LVDS video signal decoder module 22 sends according to upper-layer configured module 43
Code parameter carries out LVDS decoding, according to 6bit, 8bit, 10bit picture format, VESA/JIEDA mark
Standard is converted into the rgb video signal (i.e. VSYNC, HSYNC, DE, DATA) of standard, defeated
Go out to RGB data detection module 3.
Step 8, the rgb image data received first is cached and detects by RGB data detection module 3,
And testing result is exported show to display screen 5 and through module 43 be sent on PC display.Work as RGB
Data detection module 37 then sends operation start control signal when receiving view data detection control signal
Rgb signal buffer control module 31 receives rgb video signal.When rgb signal buffer control mould
Block 31 receives a new two field picture (being i.e. found to have VSYNC from high level to low level saltus step),
Then this frame image data is cached to RGB frame data buffer storage the first module 32, when this frame (i.e. present frame,
Hereinafter referred to as n-th frame) after data are all cached to RGB frame data buffer storage the first module 32, continue immediately
Continuous caching the (n+1)th frame in RGB frame data buffer storage the second module 33, notice RGB data inspection simultaneously
Survey module 37 n-th frame data buffer storage to complete need to it be detected；When RGB data detection module 37
When the n-th frame data cached in RGB frame data buffer storage the first module 32 are detected, RGB simultaneously
(n+1)th frame RGB data is continued to be cached to RGB frame data buffer storage by signal buffer control module 31
Two modules 33；After the (n+1)th frame RGB data has cached, RGB data detection module 37 is the completeest
Detection data cached in RGB frame data buffer storage the first module 32 in pairs, is now further continued for RGB
What frame data cached in the second module 33 data cached detects.I.e. rgb signal buffer control mould
Block 31 and RGB data detection module 37 caching alternately respectively, detection n-th, n+1 frame RGB number
According to, i.e. carry out the ping-pong operation between caching/detecting, so can constantly detect every frame data without pause,
Improve detection efficiency and reliability.RGB frame data buffer storage the first module 32, RGB frame data buffer storage
Second module 33, initial data image cache the first module 35, initial data image caches the second module
36 all can be realized by DDR storage chip, thus realize big resolution big data quantity, high read-write operation,
High reliability operation.
Step 9, when RGB data is detected by RGB data detection module 37, leads to the most respectively
Cross operation original image buffer control module 34, rgb signal buffer control module 31 reads and is cached
Good current raw image data and n-th frame are detected RGB data.Owing to cache module is mutually synchronized
Rate DDR storage chip is realized, but each DDR device is because of himself production technology and individual variation,
Cause its read-write operation speed the most identical.Therefore for guaranteeing reliably to detect, by from cache module
The data of middle reading need to be stored into corresponding FIFO (the First Input of Data Detection fifo module 39 again
First Output) in, Data Detection fifo module 39 has two FIFO to be stored in original image respectively
Data and detected RGB data.RGB data detection module 37 is according to the horizontal resolution configured
(i.e. a line view data number) is delayed by operation original image buffer control module 34, rgb signal
Deposit control module 31 and write a line raw image data and the tested RGB data of a line to respective FIFO
In, the data the most simultaneously read in these two FIFO compare, and it is big to record the pixel compared
The location of pixels of little result (identical then expression is correct, otherwise represents mistake) and contrast be (which row
Which pixel, X, Y coordinate) and give signal detecting result output module by its result and position
38.Owing to caching again once in FIFO, the reading data that can simultaneously synchronize, therefore in correction data
Time pipeline system can be used to operate, the most continuously read and compare, and constantly writing data into
To FIFO, whole read-write comparison procedure is without pausing.
Step 10, when initial data image caches the first module 35 by last raw image data write
In FIFO and after RGB data detection module 37 has compared, if rgb signal buffer control
The data that module 31 n-th frame is the most also last have compared, and middle comparison procedure does not has mistake,
Then think that the output of this frame LVDS image is correct, then proceed to detect the (n+1)th frame data.If working as RGB
Signal buffer control module 31 still has data to be detected after last raw image data is completeer, then recognize
For image resolution ratio mistake, and result is given signal detecting result output module 38 pass to upper strata PC
Machine, and stop the comparison (detected image resolution ratio cannot be judged, the most meaningless) of successive image.
If when the resolution detection of view data is correct, then continuing to inspection at some pixel error of intermediate image
Survey the (n+1)th frame.
Step 11, signal detecting result output module 38 is by RGB data testing result and LVDS electricity
Gas testing result carries out being converted into the interface data of applicable display screen 5 and gives it to show, is simultaneously converted into
The layer discernible protocol format of software control module 4 after testing is given upper strata PC and is processed.
Step 12, after current piece image has detected, changes piece image output in tested video source
Before, upper strata PC first produces switching image command to upper-layer configured module 43.Upper-layer configured module 43
By USB, SD card interface module 42, next width original image is passed to original image buffer control mould
Block 34 is cached to initial data image and caches in the second module 36 that (initial data image caches the first mould
Block 35 caching is current original image).Switching graphics control signals (bag is produced after completing caching
It is contained in view data detection control signal) to RGB data detection module 37, the most tested video source
Begin to send out the LVDS video signal of lower piece image.RGB data detection module 37 is receiving switching
The most still complete during graphics control signals present image be buffered in RGB frame data buffer storage the first module 32,
Current n frame in RGB frame data buffer storage the second module 33 and the comparison of n+1 frame RGB data, it
Rear operation rgb signal buffer control module 31 is by RGB frame data buffer storage the first module 32, RGB
Frame data cache the second module 33 and reset, and view data detection process afterwards is same as described above.Consider
The process of the LVDS video signal giving an image to video source has time delay, therefore also controls RGB letter
Signal is received again after the transmission time of number buffer control module 31 time delay about field.
The content not being described in detail in this specification belongs to existing known to professional and technical personnel in the field
Technology.
Claims (7)
1. the device detecting LVDS video signal quality, it is characterised in that including:
For the electrical characteristic of LVDS video signal is sampled, obtain LVDS video signal
Electric parameter and LVDS electric parameter benchmark carry out the LVDS transport module (1) of comparison and detection；
RGB block (2) is turned for LVDS video signal being converted into the LVDS of rgb video signal；
For every frame RGB data to be carried out successively comparison and detection with raw image data, output electrically inspection
Survey consequential signal and the RGB data detection module (3) of view data testing result signal；
For sending control parameter and control signal, reception electric testing result signal and view data inspection
Survey the detection control module (4) of consequential signal；
The control end of described detection control module (4) connects described LVDS transport module (1) respectively
With the control end of RGB data detection module (3), the data output of described detection control module (4)
End connects described LVDS transport module (1) respectively and LVDS turns the data of RGB block (2) and connects
Receiving end, the first outfan of described LVDS transport module (1) connects LVDS and turns RGB block (2)
Input, second outfan connect described RGB data detection module (3) the second input,
Described LVDS turns the outfan of RGB block (2) and connects the of RGB data detection module (3)
One input, the outfan of described RGB data detection module (3) connects detection control module (4)
Signal receiving end.
A kind of device detecting LVDS video signal quality the most according to claim 1, it is special
Levy and be: described LVDS transport module (1) including:
LVDS transmission matching module (11) for operation that LVDS video signal is terminated；
LVDS signal for the electrical characteristic of LVDS video signal is sampled electrically sample with
Quantization modules (13)；
For the electrical value of the LVDS video signal of sampling is carried out with LVDS electric parameter benchmark
The electric detection module of the LVDS (14) of comparison and detection；
The outfan of described LVDS transmission matching module (11) connects described LVDS signal and electrically adopts
Sample is connected the number of described detection control module (4) with quantization modules (13) input, data receiver
According to outfan, the outfan that described LVDS signal is electrically sampled with quantization modules (13) is connected LVDS
The electrically input of detection module (14), the outfan of the electric detection module of LVDS (14) connects institute
State the second input of RGB data detection module (3), control the end described detection control module of connection
(4) control end.
A kind of device detecting LVDS video signal quality the most according to claim 2, it is special
Levy and be: described LVDS transport module (1) also includes for the LVDS after the operation that is terminated
Video signal carries out LVDS signal shaping module (12) of shaping processing and amplifying, and its input connects institute
State the outfan of LVDS transmission matching module (11), outfan as LVDS transport module (1)
The first outfan connect described LVDS and turn the input of RGB block (2).
A kind of device detecting LVDS video signal quality the most according to claim 1, it is special
Levy and be: described LVDS turns RGB block (2) and including:
For LVDS video signal is demodulated, adjusts receiving the LVDS video signal solution of line sequence
Mode transfer block (21)；
Believe for LVDS decoding video signal being converted into the LVDS video of rgb video signal
Number decoder module (22)；
The input of described LVDS video signal demodulation module (21) connects described LVDS and transmits mould
First outfan of block (1), outfan connect described LVDS video signal decoder module (22)
Input, described LVDS video signal decoder module (22) outfan connects the inspection of described RGB data
Survey the first input end of module (3), described LVDS video signal demodulation module (21) and LVDS
The data receiver of video signal decoder module (22) is all connected with the number of described detection control module (4)
According to outfan.
A kind of device detecting LVDS video signal quality the most according to claim 1, it is special
Levy and be: described RGB data detection module (3) including:
For caching every frame RGB data successively, it is sequentially output the every frame RGB data cached simultaneously
Rgb signal buffer control module (31)；
For caching every width raw image data successively, it is sequentially output the every width original graph cached simultaneously
Original image buffer control module (34) as data；
A line RGB data and a line raw image data for reading carry out synchronizing relay behaviour
Make so that it is the Data Detection fifo module (39) of synchronism output；
For every frame RGB data is carried out the RGB data of comparison and detection with raw image data successively
Detection module (37)；
Defeated for receiving the signal detecting result of RGB data testing result and the electric testing result of LVDS
Go out module (38)；
The input of described rgb signal buffer control module (31) connects described LVDS and turns RGB
The outfan of module (2), outfan and control end connect described Data Detection fifo module (39) respectively
Input and the control signal system end of RGB data detection module (37), original image buffer control mould
The input of block (34) connects outfan, outfan and the control end of described detection control module (4)
Connect input and the RGB data detection module (37) of described Data Detection fifo module (39) respectively
Control signal end, the outfan of described Data Detection fifo module (39) connects described RGB number
According to the input of detection module (37), the outfan of described RGB data detection module (37) connects
The input of described signal detecting result output module (38), control end connect described detection and control mould
The control end of block (4), the outfan of described signal detecting result output module (38) connects described inspection
Survey the signal receiving end of control module (4).
A kind of device detecting LVDS video signal quality the most according to claim 5, it is special
Levy and be: described RGB data detection module (3) also includes:
For alternately storing the RGB frame of every frame RGB data of rgb video signal data buffer storage successively
Data buffer storage the first module (32) and RGB frame data buffer storage the second module (33), for handing over successively
Initial data for every width raw image data that storage original image buffer control module (34) caches
Image buffer storage the first module (35) and initial data image cache the second module (36)；
Described RGB frame data buffer storage the first module (32) and RGB frame data buffer storage the second module (33)
Data receiver connect respectively rgb signal buffer control module (31) data process end；
Described initial data image caches the first module (35) and initial data image caches the second module
(36) data receiver connects the data of original image buffer control module (34) respectively and processes end.
A kind of device detecting LVDS video signal quality the most according to claim 1, it is special
Levy and be: described detection control module (4) including:
For receiving the control Ethernet of parameter, RS232, RS485 interface module (41)；
For receiving USB, SD card interface module (42) of raw image data；
For sending control parameter and control signal, reception electric testing result signal and view data inspection
Survey the upper-layer configured module (43) of consequential signal,
The control end of described upper-layer configured module (43) is as the control end of detection control module (4), upper strata
The data output end of configuration module (43) is as the data output end of detection control module (4), described
The signal receiving end of upper-layer configured module (43) connects the defeated of described RGB data detection module (3)
Going out end, described upper-layer configured module (43) input connects described Ethernet, RS232, RS485 respectively
Interface module (41) and the outfan of USB, SD card interface module (42).
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| CN104978917B (en) * | 2015-07-20 | 2017-12-12 | 武汉精测电子技术股份有限公司 | DP vision signals automatic test approach and device |
| CN105491373B (en) * | 2015-12-05 | 2017-07-11 | 武汉精测电子技术股份有限公司 | A kind of LVDS vision signals single channel turns the device and method of multichannel |
| CN105872431B (en) * | 2016-04-20 | 2019-03-12 | 武汉华星光电技术有限公司 | The noise detection device and noise detection method of display module |
| CN106157859A (en) | 2016-09-27 | 2016-11-23 | 京东方科技集团股份有限公司 | For detecting the method and device of Low Voltage Differential Signal |
| CN108053784B (en) * | 2017-12-21 | 2020-11-24 | 苏州华兴源创科技股份有限公司 | System and method for testing high-speed image signal source |
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