CN201654179U - Miss spot detection device of LED induced screen - Google Patents
Miss spot detection device of LED induced screen Download PDFInfo
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- CN201654179U CN201654179U CN 201020116521 CN201020116521U CN201654179U CN 201654179 U CN201654179 U CN 201654179U CN 201020116521 CN201020116521 CN 201020116521 CN 201020116521 U CN201020116521 U CN 201020116521U CN 201654179 U CN201654179 U CN 201654179U
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Abstract
The utility model discloses a miss spot detection device of an LED induced screen. The device includes two parts, namely lower computers and a host computer, wherein the lower computers adopt distributed design and perform RS485 cascade networking; the host computer is in charge of acquiring the package of detection results, and generating detection reports and synthesizing practical presence bit image through unpacking and analyzing the package. Each lower computer comprises a driver IC including an MBI5039 and having detection function, and the driver ICs are responsible for performing error detection to bright spots and dim spots and packing and transmitting the detected data to the host computer. The detection device provided in the utility model can accurately and effectively detect the miss spots on the LED induced screen in real time, and has wide application value.
Description
Technical field
The utility model discloses a kind of LED and induces screen to lose point detection device, belongs to the LED display technical field.
Background technology
The LED electronic display is that the video display technology with the advanced person is a core, and adopting the ultra-bright LED luminescent material is display device, is equipped with audio-visual system, can lip synchronization play various graph text informations and multimedia messages.It merges LED display technique, visual theory, computer technology, video technique, electronic technology in one, be mainly used in that indoor, outdoor large electronic graph-text shows and video image shows, the picture and text that are widely used in various standardization business windows (as industry, advertising, style center, public places such as finance, post and telecommunications, electric power, metallurgy, petrochemical industry) show to have very wide application prospect.
The LED electronic display is made up of numerous LED luminotrons, because welding technology, led chip are damaged or the influence of other factors, causes the LED pixel not work or the situation of mistake point such as inefficacy happens occasionally.For high-grade full color display and highway variable information board, lose the influence of point and can not ignore, for the convenience of safeguarding, introduce the mistake point detection system of supporting telecommunication, improve the efficiency of management of LED display system greatly.
Lose point (Fault Dot) and be meant that the electric current that this point (pixel or LED lamp) flows through is less than the point of scheduled current more than 90% under correct drive condition; General normal be open circuit (0% electric current) and inefficacy (LED lamp internal resistance increase) etc.
Lose a detection system (Dot Check System) and generally form, finish the collection of mistake point situation on the display screen, the computer system that shows and browse by a mistake point detection main frame, mistake point detection and browsing software, LED electronic display, embedded mistake point detection Single Chip Microcomputer (SCM) system, communication part, interface circuit.
It is the main puzzlement of industry outwardness that LED display in use constantly occurs losing point, yet, because the limitation that electronic material or technology exist at present, exist the defective hidden danger that to reject in the LED electronic display always, become the system elbow of its high-end applications high reliability request, produce the root of high maintenance cost during also being to use.It is the puzzlement of industry outwardness that the LED electronic display in use constantly occurs losing point, and with respect to more and more higher reliability requirement, puzzlement seems more and more outstanding, loses the significance that the some detection system is used in LED display:
1. the meaning that in the product design production link, detects: thus can in design or manufacture course of products, diagnose out product quality hidden danger to be eliminated reliably in advance;
2. the meaning that in product uses, detects: treatment product fault timely and effectively, product is maintained in reliable duty, promote the customer service level.
It is the puzzlement of industry outwardness that LED induces screen in use constantly to occur losing point, with respect to more and more higher reliability requirement, statistics, assessment and the analysis of losing point are more and more important, this device just under this environment for addressing this problem a scheme that proposes.
ID number is the unique sign of each spot check daughter board on the display screen (being equivalent to a casing), and in order correctly to put the position of each spot check daughter board in order, ID number necessary strictness is arranged, otherwise will obtain wrong spot check result.In a point detection system, the ID of each spot check plate number is unique, does not allow identical ID number.
Host computer is meant that the people can directly send the computing machine of controlling order, generally is PC, shows on the screen that various signals change (hydraulic pressure, water level, temperature etc.).Slave computer is the computing machine that direct opertaing device obtains status of equipment, generally is PLC/ single-chip microcomputer and so on.Slave computer is at first given in the order that host computer sends, and slave computer becomes the corresponding time sequence signal directly to control relevant device according to this command interpretation again.Slave computer is fetch equipment status data (general analog quantity) frequently, changes into digital signal and feeds back to host computer.Upper and lower computer all needs programming, and special development system is all arranged.Usually host computer can adopt different communications protocol with the slave computer communication, and the serial communication of RS232 can be arranged, and perhaps adopts the RS485 serial communication.
Summary of the invention
It is the puzzlement of industry outwardness that LED induces screen in use constantly to occur losing point, with respect to more and more higher reliability requirement, statistics, assessment and the analysis of losing point are more and more important, this device just under this environment for addressing this problem a scheme that proposes.
Specifically, the utility model comprises following content:
A kind of LED induces screen to lose point detection device, it is characterized in that: by described device is the compressed package of being responsible for obtaining testing result, and to the mistake point that compressed package unpacked, resolves, generated examining report, synthetic actual displayed bitmap detect that host computer, LED are induced screen, lost a detection slave computer, communication part, interface circuit be electrically connected composition mutually.
Described LED induces screen to lose point detection device, and it is characterized in that: LED induces each casing of screen to have a slave computer.
Described LED induces screen to lose point detection device, it is characterized in that: slave computer has adopted distributed design, and each slave computer is networked, and networks with host computer, induce the variation of screen brightness to be delivered to host computer detected LED, and accept the control of host computer.
Described LED induces screen to lose point detection device, it is characterized in that: communication part and interface circuit are analyzed the data transfer that the detected LED of slave computer induces screen brightness to change to host computer, and host computer is delivered to slave computer to the steering order of slave computer.
Described LED induces screen to lose point detection device, and it is characterized in that: each slave computer is networked by the RS485 interface, also networks by the RS485 interface between slave computer and the host computer.
Described LED induces screen to lose point detection device, and it is characterized in that: each piece slave computer comprises the chip for driving of the detecting function of a MBI5039, and it is responsible for bright spot and dim spot are carried out error detection, and will detect packing data.
Described LED induces screen to lose point detection device, and it is characterized in that: LED induces screen to be made up of 12 casings, and each casing has 20 module groups.
LED of the present utility model induces screen mistake point detection (spot check) device to be made up of two parts: slave computer has adopted distributed design, and each slave computer has carried out RS485 cascade networking; Host computer is responsible for obtaining the compressed package of testing result, and compressed package is unpacked, resolves, generates examining report, synthetic actual displayed bitmap.
In the utility model, a LED induces screen to form (4 row, 3 row) by 12 casings, each casing has 20 module groups, 5 row, 4 row, each casing comprises a slave computer, each piece slave computer comprises the chip for driving of the detecting function of a MBI5039, and it is responsible for bright spot and dim spot are carried out error detection, and will detect packing data.
MBI5039 is a 16 passage constant-current LED chip for driving with error detection function, can support the continuous current output of 3～90mA, withstand voltage up to 17V, and message transmission rate up to 30MHz can be provided, to satisfy mass data transmission requirements in the LED display system.MBI5039 has possessed " error detection function in the message " (In-Message Error Detection) and " the error detection function of mourning in silence " (SilentError Detection).Except two kinds of above-mentioned real-time error detection functions, the also built-in overheated detecting report-back function of MBI5039 provides system to take necessary safeguard measure.This chip also provides the current gain control of 64 rank programmables, can be used for aspects such as brightness adjustment, the adjustment of module homogeneity, temperature compensation.MBI5039 reach interchannel current accuracy variation especially less than 1.5%, and the variation of the current accuracy between drive IC is less than ± 3% for promoting the inhomogeneity requirement of image quality.In addition, MBI5039 also possesses the quick output current reaction time, and the required minimum time only is 35ns.
LED described in the utility model induces screen to lose point detection device to have and can detect LED real-time and induce the function of losing point in the screen, and implements easily, according to simply.
Description of drawings
Fig. 1 loses the connection layout of point detection device for the utility model LED induces screen;
Fig. 2 induces the screen structural drawing for the utility model LED;
Wherein 1 is casing, totally 12, and 4 row, 3 row, 2 is module, and each casing is by 20 modules, and 5 row 4 are listed as, and 3 is slave computer, and each casing has a slave computer, and totally 12,4 is spot check card cabling, and 5 is the cabling between the module;
Fig. 3 is the physics trace-diagram of each casing;
Fig. 4 is the corresponding relation of logical line and physics cabling,
Wherein 1 is the scanning starting end, and 2 is end of scan end, and 3 is the physics cabling, and 4 is the logical line data;
Fig. 5 is the bit data of each byte;
Fig. 6 is the host computer procedure process flow diagram.
Embodiment
As shown in Figure 1, LED described in the utility model induces screen mistake point detection device to be made up of two parts: slave computer has adopted distributed design, and each slave computer has carried out RS485 cascade networking; Host computer is responsible for obtaining the compressed package of testing result, and compressed package is unpacked, resolves, generates examining report, synthetic actual displayed bitmap.Each piece slave computer comprises the chip for driving of the detecting function of a MBI5039, and it is responsible for bright spot and dim spot are carried out error detection, and will detect packing data.
As shown in Figure 2, in the utility model, a LED induces screen to form (4 row, 3 row) by 12 casings, each casing comprises a slave computer, each piece slave computer comprises the chip for driving of the detecting function of a MBI5039, it is responsible for bright spot and dim spot are carried out error detection, and will detect packing data.
As shown in Figure 3, slave computer of each casing band, the data trend for LED display on each casing has multiple scanning, often adopts Z font way to get there, because the design difference of various screens is very difficult to unified.For the simplification problem, on the slave computer level, only consider static scanning, and do not consider the actual conditions of Z font way to get there.
As shown in Figure 4, no matter any trend, on the slave computer level, display screen abstract be 5 the row, the data of every row have R1 (redness), G (green), B (blueness), R2 4 groups of data such as (redness), totally 20 groups of data, every row is a logical data of columns according to actual clock number.RS485 is adopted in communication during actual communication between slave computer and the host computer, and with above-mentioned logical data, delegation of delegation passes host computer back, and upper computer software carries out data analysis according to user's actual cabling setting.
In order to reduce actual amount of communication data, the data of communication, through the long compression of space, the rule of compression is very simple, i.e. the previous byte representation number in valid data district, the value of second byte representation reality, as: 04,3F represents 3F, 3F, 3F, 3F.The content of each byte wherein, it is exactly the contents fragment of horizontal logical line, as shown in Figure 5, position 7 puts 0 in place, 8 pixel values of expression level, each all has 0 and 1 two state value, if be that the state of 1 indication lamp is normal, if be 0 the expression abnormal state, this moment need add up abnormity point.
Fig. 6 is the host computer procedure process flow diagram, as seen from the figure, after program begins, enters manual spot check or automatic detecting pattern, sends the spot check order, obtains the spot check compressed package then successively, and the bag that decompresses generates the report of spot check bitmap and spot check, finishes at last.
Communication protocol between host computer and the slave computer mainly is made up of packet header, inclusion and bag tail three parts.Packet header HEAD is with 0x7e, and two characters of 0x43 begin, and middle inclusion has comprised the data of transmitting, the bag tail comprised packet verification and, finish with 0x7e at last.The order that relates generally in the spot check process has:
1, operation spot check order
[Command]：
Byte[0,1]=HEAD; //-----packet header
Byte[2]＝’*’；//-----ID0，
Byte[3]＝’*’；//-----ID1，
Byte[4]＝’*’；//-----ID2，
Byte[5]=0x02; //------spot check order code name
Byte[6]=PARA //-----scan mode, be 0x01 here
Byte[7]=CHK[2..6] //-----verification and
Byte[8]=EOF; //-----Bao tail
[Return]：
None；
Illustrate: the numbering of slave computer has been represented in the combination of ID0, ID1, ID2, the numbering of slave computer can be provided with and deposit in this slave computer by hand, ID is " * " number representative broadcasting entirely, and host computer procedure will send the spot check order to all slave computers that link to each other therewith.After slave computer receives order, begin to carry out the spot check process, and with spot check result packing, this order rreturn value is empty.
2, obtain the order of spot check compression data packet
[Command]：
Byte[0,1]=HEAD; //-----packet header
Byte[2]＝’0’；//-----ID0，
Byte[3]＝ID1；//-----ID1，
Byte[4]＝ID2；//-----ID2，
Byte[5]=0x04; // obtain the order of spot check compressed package
Byte[6]=0x01; //-----scan mode
Byte[7]＝CHK[2..]；
Byte[8]=EOF; //-----Bao tail
[Return]：
RET[0,1]=HEAD; //-----packet header
RET[2，3，4]＝ID0，ID1，ID2
RET[5]＝L4_BYTES；
RET[6，7]＝Scans，MAXLINES；
{RET[8，9]，RET[10，11]，...}＝DATA?OF?LONG+Data..
RET[.]=// verification of data division and.
RET[.]=EOF; // bag tail
Illustrate: obtain the order of spot check compression data packet and form by 9 bytes altogether, preceding 2 bytes are packet header, then three bytes have been represented ID number of slave computer, the 6th byte is the code name of this order: 0x04, the 7th byte is scan mode, at present the scan mode of spot check software all is 0x01, the verification that the 8th byte is the data division except that packet header and bag tail with, last byte is to wrap tail 0x7e.
Returned value specification: preceding 2 of rreturn value is packet header, then 3 is the id information of slave computer, the 6th is meant the byte number on the logical level direction, per two expression quantity of ensuing data and byte are right, represent 64 0xFF as 0x400xFF, this also is the compress mode of data, also will decompress accordingly in the time of parsing.Below we come the data of a reality are made an explanation:
7E 43//packet header
30 03 03//expression ID1=3, ID2=3
The every row of 40//expression has 64 bytes, can represent the pixel of 64*8.
01 20//spot check mode
40 FF, 40 00 40 FF, 40 00//the first line data
40 FF, 40 00 40 FF, 40 00//the second line data
40 FF, 40 00 40 FF, 40 00//the third line data
40 FF, 40 00 40 FF, 40 00//fourth line data
3F FF 01 7F 40 00 40 FF 40 00 fifth line data
40?00?40?00?40?00?40?00?40?00?40?00?40?00?40?00?40?00?40?00?40?0040?00
// more than be that data compression is right
75 7E//verification and and bag tail.
Data division is decompressed, and four be divided into one group, we can obtain first group of data:
FF?FF?FF?FF?FF?FF?FF?FF…………FF?FF?FF?FF?FF?FF?FF?FF?FF?FF?FF
00?00?00?00?00?00?00?00…………00?00?00?00?00?00?00?00?00?00?00
FF?FF?FF?FF?FF?FF?FF?FF…………FF?FF?FF?FF?FF?FF?FF?FF?FF?FF?FF
00?00?00?00?00?00?00?00…………00?00?00?00?00?00?00?00?00?00?00
According to protocal analysis, first 64 byte representation be red data, the 3rd 64 byte are green data, and be complete zero, illustrate that these all states of organizing data representation all are normal.By that analogy, analyze the fifth line data, obtain after the decompression:
FF?FF?FF?FF?FF?FF?FF?FF…………FF?FF?FF?FF?FF?FF?FF?FF?FF?FF?7F
00?00?00?00?00?00?00?00…………00?00?00?00?00?00?00?00?00?00?00
FF?FF?FF?FF?FF?FF?FF?FF…………FF?FF?FF?FF?FF?FF?FF?FF?FF?FF?FF
00?00?00?00?00?00?00?00…………00?00?00?00?00?00?00?00?00?00?00
Can see that therefrom in the red data, it is 7F that a state is arranged, and is launched into binary representation 01111111, it is 0 that expression has a dotted state, illustrates that this dotted state is unusual.
The host computer procedure support is manually lost some inspection modes with automatic two kinds, by parsing to the spot check data, we can obtain the result of spot check, for the spot check result is shown in more intuitive mode, we provide spot check method of reducing as a result, just according to the data after resolving and in conjunction with the actual trace-diagram of physics, resolution recovery spot check figure according to the screen body, because we have adopted the LED screen of two primary colours, so the result of spot check has two kinds of colors, two width of cloth figure, be respectively red and green.
With reference to the actual LED display installation diagram of Fig. 2, the whole LED screen is made up of the casing of 4 row, 3 row, and each casing has a slave computer, each slave computer can detect all luminous points of this casing, that is to say,, all will check 64*40 point each primary colours.Referring now to Fig. 3, it has represented an actual cabling that casing is interior, and therefrom we can see, each casing can be regarded the blockage of 40 8*8 again as, wherein, 8 squares is arranged laterally, and 5 squares are vertically arranged.The cabling of the square of each 8*8 all is the same, in the middle of the right, and to the some end in centre on the left side, and the like.Because the box structure of each 8*8 is the same, so be easy to provide a kind of unified algorithm that reduction of data is become the bitmap picture.
Claims (7)
1. a LED induces screen to lose point detection device, it is characterized in that: by described device is the compressed package of being responsible for obtaining testing result, and to the mistake point that compressed package unpacked, resolves, generated examining report, synthetic actual displayed bitmap detect that host computer, LED are induced screen, lost a detection slave computer, communication part, interface circuit be electrically connected composition mutually.
2. the described LED of claim 1 induces screen to lose point detection device, and it is characterized in that: LED induces each casing of screen to have a slave computer.
3. the described LED of claim 1 induces screen to lose point detection device, it is characterized in that: slave computer has adopted distributed design, and each slave computer is networked, and networks with host computer, induce the variation of screen brightness to be delivered to host computer detected LED, and accept the control of host computer.
4. the described LED of claim 1 induces screen to lose point detection device, it is characterized in that: communication part and interface circuit are analyzed the data transfer that the detected LED of slave computer induces screen brightness to change to host computer, and host computer is delivered to slave computer to the steering order of slave computer.
5. the described LED of claim 1 induces screen to lose point detection device, and it is characterized in that: each slave computer is networked by the RS485 interface, also networks by the RS485 interface between slave computer and the host computer.
6. the described LED of claim 1 induces screen to lose point detection device, and it is characterized in that: each piece slave computer comprises the chip for driving of the detecting function of a MBI5039, and it is responsible for bright spot and dim spot are carried out error detection, and will detect packing data.
7. the described LED of claim 1 induces screen to lose point detection device, and it is characterized in that: LED induces screen to be made up of 12 casings, and each casing has 20 module groups.
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| CN 201020116521 CN201654179U (en) | 2010-02-09 | 2010-02-09 | Miss spot detection device of LED induced screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020116521 CN201654179U (en) | 2010-02-09 | 2010-02-09 | Miss spot detection device of LED induced screen |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076531A (en) * | 2012-12-28 | 2013-05-01 | 上海澳星照明电器制造有限公司 | Light emitting diode (LED) failure detection circuit based on MBI5039 chip and detection method |
| CN104021748A (en) * | 2014-06-18 | 2014-09-03 | 无锡市崇安区科技创业服务中心 | LED display screen dead point detecting system |
| CN104112413A (en) * | 2013-04-17 | 2014-10-22 | 深圳市德彩光电有限公司 | LED display screen dead pixel point inspection system |
-
2010
- 2010-02-09 CN CN 201020116521 patent/CN201654179U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076531A (en) * | 2012-12-28 | 2013-05-01 | 上海澳星照明电器制造有限公司 | Light emitting diode (LED) failure detection circuit based on MBI5039 chip and detection method |
| CN104112413A (en) * | 2013-04-17 | 2014-10-22 | 深圳市德彩光电有限公司 | LED display screen dead pixel point inspection system |
| CN104112413B (en) * | 2013-04-17 | 2016-12-28 | 深圳市德彩光电有限公司 | LED display bad point point detection system |
| CN104021748A (en) * | 2014-06-18 | 2014-09-03 | 无锡市崇安区科技创业服务中心 | LED display screen dead point detecting system |
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Granted publication date: 20101124 Termination date: 20140209 |