CN104112413A - LED display screen dead pixel point inspection system - Google Patents
LED display screen dead pixel point inspection system Download PDFInfo
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- CN104112413A CN104112413A CN201310133211.8A CN201310133211A CN104112413A CN 104112413 A CN104112413 A CN 104112413A CN 201310133211 A CN201310133211 A CN 201310133211A CN 104112413 A CN104112413 A CN 104112413A
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- 238000007689 inspection Methods 0.000 title abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 238000013480 data collection Methods 0.000 claims description 31
- 238000012546 transfer Methods 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 7
- 230000006870 function Effects 0.000 abstract description 14
- 230000008054 signal transmission Effects 0.000 abstract description 5
- 230000002708 enhancing effect Effects 0.000 abstract description 4
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Abstract
The invention relates to the technical field of LED display screen detection and especially to an LED display screen dead pixel point inspection system. In the LED display screen dead pixel point inspection system, a data collecting module is used for collecting and enhancing data inspected by constant-current LED driving chips with full-screen real-time silent error detecting functions; a point inspection module intercepts data transmitted by the data collecting module, then processes, stores, and collects the data in batches, and transmits the date via a RS485 bus. A master control module receives data transmitted by the point inspection module via the RS485 bus. In virtue of the advantage of transmitting the signals with the RS485 bus, the LED display screen dead pixel point inspection system has advantages of long transmission distance and stable signal transmission. The transmitted data may correctly reflect the amount and the coordinates of dead pixels in the LED display screen.
Description
Technical field
The present invention relates to LED display detection technique field, particularly a kind of LED display bad point point detection system.
Background technology
At present, LED display is applied in large board.LED display is comprised of thousands of LED pixels, each pixel forms by the LED lamp of a plurality of different colours, any one LED breaks down all can affect the whole display effect of LED display, two kinds of faults that wherein LED the most often occurs are open fault and short trouble, general designation bad point.
Therefore,, for guaranteeing the normal display effect of LED display, need regularly or irregularly LED display carried out to bad point spot check.
Prior art provides a kind of constant-current LED with the full frame error detection function of mourning in silence in real time to drive chip (as MBI5039), and this type of constant-current LED with the full frame error detection function of mourning in silence in real time drives chip in the time of driving LED lamp, can carry out spot check to LED lamp.While in addition, adopting this type of constant-current LED with the full frame error detection function of mourning in silence in real time to drive chip to carry out spot check to LED lamp, can't affect LED display normally shows.
But, in prior art, constant-current LED based on there being the full frame erroneous point checking functions of mourning in silence in real time drives in the LED bad point point detection system of chip, this has the constant-current LED of the full frame erroneous point checking functions of mourning in silence in real time to drive the information of chip institute spot check directly to adopt Transistor-Transistor Logic level signal to transmit, transmission range is shorter, and jitter, causes transmitted data to be difficult to correctly feed back bad point quantity, the coordinate in LED display.
Summary of the invention
The object of the present invention is to provide a kind of LED bad point point detection system, be intended to solve the transmission range that the LED bad point point detection system of prior art exists shorter, and jitter, causes transmitted data to be difficult to correctly feed back the bad point quantity in LED display, the problem of coordinate.
For this reason, the present invention is by the following technical solutions:
A LED display bad point point detection system, communicates by letter with host computer, comprises LED display, and the LED lamp of described LED display drives chip drives by the constant-current LED with the full frame error detection function of mourning in silence in real time; Described LED display bad point point detection system also comprises:
Collect and strengthen the data collection module that described constant-current LED drives the data of chip institute spot check, the output terminal of LED display described in its input termination;
Data to the transmission of described data collection module intercept rear batch treatment, storage and collection, and the spot check module that adopts RS485 bus to transmit, the output terminal of data collection module described in its input termination;
Sending spot check sequential to LED display drives chip to carry out spot check to LED display to start described constant-current LED, receive the data of described spot check module by described RS485 bus transfer with judgement and record the bad point coordinate information of described LED display, and described bad point coordinate information is transferred to the main control module that host computer shows, its input termination described in spot check module output terminal, output termination described in LED display input end, communication termination described in host computer.
In LED display bad point point detection system provided by the invention, the constant-current LED described in the collection of employing data collection module and enhancing with the full frame error detection function of mourning in silence in real time drives the data of chip institute spot check, spot check module intercepts rear batch treatment, storage and collection to the data of described data collection module transmission, adopt afterwards RS485 bus to transmit, main control module receives described spot check module by the data of RS485 bus transfer; Utilize the advantage of RS485 bus transfer signal, therefore LED display bad point point detection system provided by the invention, has long transmission distance, the advantage of steady signal transmission, and its data of transmitting can correctly be fed back bad point quantity, the coordinate in LED display.
Accompanying drawing explanation
The theory diagram of the LED bad point point detection system that Fig. 1 provides for the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
With reference to Fig. 1, the theory diagram of the LED bad point point detection system that the embodiment of the present invention provides.
A LED display bad point point detection system, communicates by letter with host computer 5, comprises LED display 1, and the LED lamp 12 of LED display 1 drives chip 11 to drive by the constant-current LED with the full frame error detection function of mourning in silence in real time; LED display bad point point detection system also comprises: collect and strengthen the data collection module 2 that constant-current LED drives the data of 11 spot checks of chip, it inputs the output terminal of termination LED display 1; Data to data collection module 2 transmission intercept rear batch treatment, storage and collection, and the spot check module 3 that adopts RS485 bus to transmit, the output terminal of its input termination data collection module 2; Sending spot check sequential to LED display 1 drives 11 pairs of LED display of chip 1 to carry out spot check to start constant-current LED, receive spot check module 3 data by RS485 bus transfer to judge and to record the bad point coordinate information of LED display 1, and bad point coordinate information is transferred to the main control module 4 that host computer 5 shows, input end, the communication ends of the output terminal of its input end contact inspection module 3, output termination LED display 1 connect host computer 5.
In the LED display bad point point detection system that the embodiment of the present invention provides, the data that adopt data collection module 2 to collect and strengthen 11 spot checks of constant-current LED driving chip with the full frame error detection function of mourning in silence in real time, the data of 3 pairs of data collection modules of spot check module, 2 transmission intercept rear batch treatment, storage and collection, adopt afterwards RS485 bus to transmit, main control module 5 receives spot check module 3 by the data of RS485 bus transfer; Utilize the advantage of RS485 bus transfer signal, therefore the LED display bad point point detection system that the embodiment of the present invention provides, there is long transmission distance, the advantage of steady signal transmission, its data of transmitting can correctly be fed back bad point quantity, the coordinate in LED display.
In the present embodiment, the constant-current LED driving chip 11 with the full frame error detection function of mourning in silence is in real time that model is the constant-current LED driving chip of MBI5039.This MBI5039 has 16 constant current output pins, can drive 1-16 LED lamp simultaneously, in driving LED lamp, can to LED lamp, carry out spot check in real time.
In the present embodiment, data collection module 2 comprises that model is the tri-state bus driver of 74HC245, and its input end, output terminal are respectively as input end, the output terminal of data collection module 2.
In the present embodiment, spot check module 3 comprises:
The data that data collection module 2 is sent intercept the CPLD of rear batch treatment, and its input end is as the input end of spot check module 3; Data to CPLD transmission are collected and are stored, and adopt afterwards RS485 bus to transmit single-chip microcomputer, the output terminal of its input termination CPLD, and output terminal is as the output terminal of spot check module 3.
In the present embodiment, main control module 4 comprises: send spot check sequential and to start constant-current LED, drive 11 pairs of LED display of chip 1 to carry out the FPGA of spot check to LED display 1, its output terminal is as the output terminal of main control module 4; Thereby send spot check order to FPGA, receive 3 judgements of the data by RS485 bus transfer of spot check module and record the bad point coordinate information of LED display 1 and bad point coordinate information is transferred to the arm processor of host computer 5, its input end is as the input end of main control module 4, the input end of output termination FPGA, communication ends is as the communication ends of main control module 4.
The principle of work of the LED display bad point the point detection system below embodiment of the present invention being provided is further described.
Arm processor, after receiving the spot check order of host computer 5 transmissions, first sends spot check order to the single-chip microcomputer of spot check module 3, controls spot check module 3 start-up routines; Then send spot check order to FPGA; Then enter waiting status, wait for the data that spot check module 3 is come by RS485 bus transfer.
FPGA, after receiving the spot check order of arm processor transmission, sends spot check sequential to the constant-current LED driving chip 11 of the full frame error detection function of mourning in silence in real time of having of LED display 1.
After the constant-current LED driving chip 11 with the full frame error detection function of mourning in silence in real time in LED display 1 receives spot check sequential, judge that this spot check sequential is open circuit spot check sequential or short circuit spot check sequential, then to the LED lamp 12 of LED display 1 open a way spot check or short circuit spot check, and by institute's spot check to data be stored in its inner register, then by institute's spot check to data export chronologically data collection module 2 to.
For data collection module 2, because LED display 1 is comprised of thousands of LED pixels, each pixel forms by the LED lamp 12 of a plurality of different colours, therefore the data volume of the LED display 1 of institute's spot check is very large; And from LED display 1 data-interface disunity out, and signal a little less than, so this data collection module 2 need to be set, for Data Collection and enhancing.The data transmission of receipt collection module 2 by the Data Collection of LED display transmission and after strengthening is to spot check module 3.In the present embodiment, data collection module 2 comprises 74HC245.
In spot check module 3, due to LED display 1 spot check data volume very large, need to the data of data collection module 2 transmission, intercept rear batch treatment by CPLD, and the data after processing are sent to single-chip microcomputer.
Below illustrate this CPLD to the data of data collection module transmission intercept, the concrete mode of batch treatment:
LED display for 16*16 pixel, each pixel of this LED display display screen comprises R, G, B, Y totally 4 LED lamps, totally 16 * 16 * 4=1024 LED lamp, the LED lamp of this LED display drives by MBI5039, each MBI5039 drives 16 LED lamps, therefore altogether need 16 MBI5039; The data transmission that in this MBI5039, spot check arrives is to data collection module 2, and R, G, B, the Y that data collection module once transfers to CPLD totally 4 circuit-switched data is 64.When CPLD reads first, the data to this every group 64 bit data intercepting regular lengths, as 8 bit data; After intercepting 8 bit data, transfer to single-chip microcomputer; Intercept subsequently the data of next regular length, the data of this next regular length are consistent with the length of intercepting first, therefore be still 8; So to completing, read 64 all bit data.
Because the memory capacity of CPLD is limited, thus CPLD by intercepting, data transmission after batch treatment to single-chip microcomputer, single-chip microcomputer is collected these data and store, afterwards by 485 bus transfer to arm processor.
Arm processor receives after the data that the single-chip microcomputer of spot check module 3 comes by RS485 bus transfer, these data are processed: the order of the data that send according to spot check module 3 is to identify the coordinate information of corresponding LED display 1, judge bad point coordinate information record, finally bad point coordinate information is sent to host computer.
In the embodiment of the present invention, in the LED display bad point point detection system providing, the constant-current LED described in 2 collections of employing data collection module and enhancing with the full frame error detection function of mourning in silence in real time drives the data of 11 spot checks of chip, the data of 3 pairs of described data collection module 2 transmission of spot check module intercept rear batch treatment, storage and collection, adopt afterwards RS485 bus to transmit, main control module 5 receives described spot check module 3 by the data of RS485 bus transfer; Utilize the advantage of RS485 bus transfer signal, therefore the LED display bad point point detection system that the embodiment of the present invention provides, there is long transmission distance, the advantage of steady signal transmission, its data of transmitting can correctly be fed back bad point quantity, the coordinate in LED display.
The LED display bad point point detection system that the embodiment of the present invention provides, through CPLD to data intercept, batch treatment, and collect, store by single-chip microcomputer, single-chip microcomputer sends data to arm processor by 485 buses afterwards, arm processor is judged bad point coordinate information record, finally bad point coordinate information is sent to host computer.Utilize the advantage of RS485 bus transfer signal, therefore the LED display bad point point detection system that the embodiment of the present invention provides, there is long transmission distance, the advantage of steady signal transmission, its data of transmitting can correctly be fed back bad point quantity, the coordinate in LED display.
These are only the preferred embodiment of the present invention, be not limited to the present invention, all any modifications of doing within principle of the present invention, be equal to and replace and improvement etc., within all should being included in the scope of protection of the invention.
Claims (5)
1. a LED display bad point point detection system, communicates by letter with host computer (5), comprises LED display (1), and the LED lamp (12) of described LED display (1) drives chip (11) to drive by the constant-current LED with the full frame error detection function of mourning in silence in real time; It is characterized in that, described LED display bad point point detection system also comprises:
Collect and strengthen the data collection module (2) that described constant-current LED drives the data of chip (11) institute spot check, the output terminal of LED display (1) described in its input termination;
Data to described data collection module (2) transmission intercept rear batch treatment, storage and collection, and the spot check module (3) that adopts RS485 bus to transmit, the output terminal of data collection module (2) described in its input termination;
Sending spot check sequential to LED display (1) drives chip (11) to carry out spot check to LED display (1) to start described constant-current LED, receive the data of described spot check module (3) by described RS485 bus transfer with judgement and record the bad point coordinate information of described LED display (1), and described bad point coordinate information is transferred to the main control module (4) that host computer (5) shows, its input termination described in spot check module (3) output terminal, output termination described in LED display (1) input end, communication termination described in host computer (5).
2. LED display bad point point detection system as claimed in claim 1, is characterized in that, described in there is the full frame error detection function of mourning in silence in real time constant-current LED to drive chip (11) be that model is that the constant-current LED of MBI5039 drives chip.
3. LED display bad point point detection system as claimed in claim 1, it is characterized in that, described data collection module (2) comprises that model is the tri-state bus driver of 74HC245, and its input end, output terminal are respectively as input end, the output terminal of described data collection module (2).
4. LED display bad point point detection system as claimed in claim 1, is characterized in that, described spot check module (3) comprising:
The data that described data collection module (2) is sent intercept the CPLD of rear batch treatment, and its input end is as the input end of described spot check module (3);
Data to described CPLD transmission are collected and are stored, and adopt afterwards RS485 bus to transmit single-chip microcomputer, the output terminal of CPLD described in its input termination, and output terminal is as the output terminal of described spot check module (3).
5. LED display bad point point detection system as claimed in claim 1, is characterized in that, described main control module (4) comprising:
Send spot check sequential and to start described constant-current LED, drive chip (11) LED display (1) to be carried out to the FPGA of spot check to LED display (1), its output terminal is as the output terminal of described main control module (4);
Send spot check order to FPGA, receive described spot check module (3) thereby the data judgement by RS485 bus transfer and record the bad point coordinate information of described LED display (1) and bad point coordinate information is transferred to the arm processor of host computer (5), its input end is as the input end of described main control module (4), the input end of FPGA described in output termination, communication ends is as the communication ends of described main control module (4).
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| CN201310133211.8A CN104112413B (en) | 2013-04-17 | 2013-04-17 | LED display bad point point detection system |
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| CN104333676A (en) * | 2014-11-11 | 2015-02-04 | 广东中星电子有限公司 | Defective pixel shielding method and system |
| CN104778911A (en) * | 2015-04-22 | 2015-07-15 | 西安诺瓦电子科技有限公司 | Point inspection method of LED sign board as well as LED display control card |
| CN104795025A (en) * | 2015-04-29 | 2015-07-22 | 西安诺瓦电子科技有限公司 | LED display module and method for detecting states thereof |
| CN104900187A (en) * | 2015-06-16 | 2015-09-09 | 西安诺瓦电子科技有限公司 | LED display board control method, LED display board control device, and LED control card |
| CN107025869A (en) * | 2017-04-27 | 2017-08-08 | 西安诺瓦电子科技有限公司 | Off line detecting method and system |
| CN107464511A (en) * | 2017-08-17 | 2017-12-12 | 苏州瑞光电子科技股份有限公司 | A kind of detection circuit of LED display, method and system |
| CN110657949A (en) * | 2019-09-29 | 2020-01-07 | 深圳市创显光电有限公司 | LED display screen lamp bead spot inspection device and spot inspection method thereof |
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| CN104112413B (en) | 2016-12-28 |
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Address after: 518000 201, No. 13, Huiye Road, Tangjia community, Fenghuang street, Guangming District, Shenzhen City, Guangdong Province Patentee after: Shendecai photoelectric (Shenzhen) Co.,Ltd. Address before: 518000, Guangdong, Baoan District, Fuyong Shenzhen street, new and rich industrial zone eighth, first, second floor Patentee before: Shenzhen Dicolor Optoelectronics Co.,Ltd. |
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Denomination of invention: LED display screen dead pixel point inspection system Effective date of registration: 20200724 Granted publication date: 20161228 Pledgee: Dongguan branch of Bank of Dongguan Co.,Ltd. Pledgor: Shendecai photoelectric (Shenzhen) Co.,Ltd. Registration number: Y2020980004385 |
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Address after: 518000 201, No. 13, Huiye Road, Tangjia community, Fenghuang street, Guangming District, Shenzhen City, Guangdong Province Patentee after: Shendecai Technology (Shenzhen) Co.,Ltd. Address before: 518000 201, No. 13, Huiye Road, Tangjia community, Fenghuang street, Guangming District, Shenzhen City, Guangdong Province Patentee before: Shendecai photoelectric (Shenzhen) Co.,Ltd. |
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Granted publication date: 20161228 Pledgee: Dongguan branch of Bank of Dongguan Co.,Ltd. Pledgor: Shendecai Intelligent Technology (Dongguan) Co.,Ltd.|Shendecai photoelectric (Shenzhen) Co.,Ltd. Registration number: Y2020980004385 |
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