CN107464511A - A kind of detection circuit of LED display, method and system - Google Patents
A kind of detection circuit of LED display, method and system Download PDFInfo
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- CN107464511A CN107464511A CN201710705531.4A CN201710705531A CN107464511A CN 107464511 A CN107464511 A CN 107464511A CN 201710705531 A CN201710705531 A CN 201710705531A CN 107464511 A CN107464511 A CN 107464511A
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- led
- sample rate
- led display
- rate current
- detection
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Led Devices (AREA)
- Control Of El Displays (AREA)
Abstract
The invention discloses a kind of detection circuit of LED display, method and system.The circuit includes：Sampling resistor and detection chip；The sampling resistor is series at the power circuit of the LED display, and the sampled output of the sampling resistor is connected to send sample rate current with the sampling input of the detection chip；The detection chip is used to judge whether the LED is effective according to the sample rate current；The controlled end of the detection chip is connected with the control card of the display screen detects enabling signal to access.The embodiment of the present invention judges whether the LED in LED display is effective one by one by detecting circuit, to realize the serviceability rate situation of LED in real-time statistics LED display, forms real-time data report, saves manpower, reduce cost, and have good versatility.
Description
Technical field
The present embodiments relate to LED display detection technique, more particularly to a kind of detection circuit of LED display, side
Method and system.
Background technology
Some clients required to public service quality, situation about can be failed to LED in LED display are united
Meter, it is repaired or replaced for failing more than a certain proportion of equipment.
At present, in general LED display the method for LED failure statistics have artificial periodically site inspection, image recognition,
LED unit plate self-sensing.The shortcomings that artificial statistics is to make an inspection tour interval length, a few weeks or months inspection once, LED failure
Situation cannot accomplish real-time statistics.The shortcomings that image recognition be need in place installation diagram as identification camera, cost
Height, camera have been observed after display screen, it is necessary to go to the angle of routine work by head.Self detection skill of LED unit plate
Art is mainly used in the static display of top grade, such as the LED display of outlet, highway advices plate etc..Solution is
Using application-specific integrated circuit (such as accumulation, the IC products of the function containing trouble shooting of MAXIM companies) and control card, but this solution is not
It can be used in the product of low-grade high request.
Existing technical scheme can not realize the situation that LED fails in real-time statistics LED display, while human input
Big and cost is high.
The content of the invention
The present invention provides a kind of detection circuit of LED display, method and system, to realize real-time statistics LED display
The serviceability rate situation of middle LED, real-time data report is formed, save manpower, reduce cost, and there is good versatility.
In a first aspect, the embodiments of the invention provide a kind of detection circuit of LED display, the circuit includes：Sampling electricity
Resistance and detection chip；
The sampling resistor is series at the power circuit of the LED display, the sampled output of the sampling resistor with
The sampling input of the detection chip is connected to send sample rate current；
The detection chip is used to judge whether the LED is effective according to the sample rate current；The detection chip
Controlled end is connected with the control card of the display screen detects enabling signal to access.
Second aspect, the embodiment of the present invention additionally provide a kind of detection method of LED display, and this method includes：
The LED into the LED display sends the control signal for lighting the LED one by one；
Obtain the LED receive corresponding to sampling after control signal in the power circuit of the LED display
Electric current；
Failure judgement is carried out to the corresponding LED according to the sample rate current.
The third aspect, the embodiment of the present invention additionally provide a kind of detecting system of LED display, and the system includes：
Signal transmitting unit, the control letter for lighting the LED is sent for the LED one by one into the LED display
Number；
Data capture unit, for obtain the LED receive corresponding to the LED display after control signal
Sample rate current in power circuit；
Fail judging unit, for carrying out failure judgement to the corresponding LED according to the sample rate current.
The embodiment of the present invention judges whether the LED in LED display is effective one by one by detecting circuit, real-time to realize
The serviceability rate situation of LED in LED display is counted, forms real-time data report, manpower is saved, reduces cost, and have
Good versatility.
Brief description of the drawings
Fig. 1 is a kind of structure chart of the detection circuit of the LED display provided in the embodiment of the present invention one；
Fig. 2 is a kind of flow chart of the detection method of the LED display provided in the embodiment of the present invention two；
Fig. 3 is a kind of structure chart of the detecting system of the LED display provided in the embodiment of the present invention three.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, below in conjunction with the accompanying drawings to the specific reality of the present invention
Example is applied to be described in further detail.It is understood that specific embodiment described herein is used only for explaining the present invention,
Rather than limitation of the invention.
It also should be noted that for the ease of description, illustrate only in accompanying drawing part related to the present invention rather than
Full content.It should be mentioned that some exemplary embodiments are described before exemplary embodiment is discussed in greater detail
Into the processing or method described as flow chart.Although operations (or step) are described as the processing of order by flow chart,
It is that many of which operation can be implemented concurrently, concomitantly or simultaneously.In addition, the order of operations can be by again
Arrange.The processing can be terminated when its operations are completed, it is also possible to the additional step being not included in accompanying drawing.
The processing can correspond to method, function, code, subroutine, subprogram etc..
Embodiment one
Fig. 1 is a kind of structure chart of the detection circuit for LED display that the embodiment of the present invention one provides, it is necessary to explanation
In the structure chart shown in Fig. 1, to be not all of structure and belong to the detection circuit, also including LED display work needed for
Custom circuit, the detection circuit is placed in the custom circuit of whole LED display in Fig. 1, and based on this to the implementation
Detection circuit in example is described in detail.As shown in figure 1, the detection circuit 100 includes：Sampling resistor 110 and detection chip
120.The present embodiment is applicable to the situation to the LED detection failure in LED display.
The sampling resistor 110 is series at the power circuit of the LED display, and the sampling of the sampling resistor 110 is defeated
Go out end with the sampling input of the detection chip 120 to be connected to send sample rate current；
The detection chip 120 is used to judge whether the LED is effective according to the sample rate current；The detection chip
120 controlled end is connected with the control card of the display screen detects enabling signal to access.
On the basis of above-mentioned technical proposal, the sampling resistor 110 preferably can be 20m Ω.
On the basis of above-mentioned technical proposal, the detection chip 120 preferably can be ARM devices, and concrete model can be with
For LPC1114.
Specifically, the data output end of the detection chip 120 is connected with the control card, to send testing result.
Specifically, the data output end of the detection chip 120 is connected by spi bus with the control card.
Specifically, the sampled output of the sampling resistor 110 passes through A/D change-over circuits and the detection chip 120
Sampling input is connected.
The operation principle of the detection circuit 100 of the LED display：
LED display plate inputs enabling signal, and signal driving chip 130 (such as 74HC245 chips) is by detection process
The control signal of LED be sent to row driving constant-current source IC140 and row decoding chip 150 (such as 74HC138 chips), row drive
Dynamic constant-current source IC140 powers according to control signal selection for a certain row LED, and row decoding chip 150 selects according to control signal
Some LED is lighted, that is, turns on row scanning metal-oxide-semiconductor 160 (equivalent to the effect of switching tube) corresponding to the LED, row driving is permanent
Stream source IC140 power supply and the switch conduction of row decoding chip 150, light the LED in LED array 170 jointly.5V power supplys are just
The sampling resistor 110 in connection detection circuit 100 is held, power supply negative terminal is in row driving constant-current source IC140 sides, scanning metal-oxide-semiconductor of being expert at
Electric current flows into through anode during 160 conducting, flows through LED array 170, is flowed out from negative terminal.Control card ensures to detect in detection circuit 100
Period, in turn lightening LED lamp, same time only have a LED to be lit.Meanwhile control card will detect enabling signal and send
To detection chip 120, detection chip 120 can determine the particular location for the LED being lit, and detection chip 120 passes through
Whether the electric current of sampling resistor 110 of the detection by A/D conversions, the LED for judging currently to be lit fail.Specifically, when
When control signal controls the source electrode of row scanning metal-oxide-semiconductor 160 corresponding to some LED and drain electrode conducting, if the LED can be just
Often use, then now the LED can form loop, and power circuit has electric current, the sampling electricity that sampling resistor 110 collects
Stream can reach certain size, show that the LED is normal；, whereas if the LED is abnormal, then now the LED can not
Loop is formed, the current anomaly in power circuit, the output result of sampling resistor 110 may indicate that LED exception.Detection knot
Fruit is stored in the internal storage space of detection chip 120, and control card is communicated by spi bus and detection chip 120, is obtained whole
The serviceability rate data of LED in LED display.
The technical scheme of the present embodiment, judge whether the LED in LED display is effective one by one by detecting circuit, with
The serviceability rate situation of LED in real-time statistics LED display is realized, forms real-time data report, manpower is saved, reduces into
This, and there is good versatility.
Embodiment two
Fig. 2 is a kind of flow chart of the detection method for LED display that the embodiment of the present invention two provides.The present embodiment can fit
For detecting the situation of failure to the LED in LED display, this method can be shown in LED provided in an embodiment of the present invention
On the basis of the detection circuit of screen, performed by the control card of LED display.
As described in Figure 2, the method for the present embodiment specifically includes：
S210, one by one the LED into the LED display send the control signal for lighting the LED.
Specifically, row scanning metal-oxide-semiconductor sends control signal corresponding to the LED into the LED display one by one, to lead
The logical row scans metal-oxide-semiconductor so as to turn on the power supply circuit of the LED.
S220, obtain the LED receive corresponding to after control signal in the power circuit of the LED display
Sample rate current.
S230, failure judgement is carried out to the corresponding LED according to the sample rate current.
Specifically, failure judgement is carried out to the corresponding LED according to the sample rate current after A/D is changed.
On the basis of above-mentioned technical proposal, if the sample rate current reaches the threshold value of setting, sampling electricity is confirmed
The LED failure corresponding to stream.
The technical scheme of the present embodiment, by lighting the LED in LED display one by one, obtain the power supply of LED display
Sample rate current in circuit, so as to whether reach threshold value set in advance according to sample rate current, to judge the LED being lit
Whether effectively, to realize the serviceability rate situation of LED in real-time statistics LED display, real-time data report is formed, saves people
Power, cost is reduced, and there is good versatility.
Embodiment three
Fig. 3 is a kind of structure chart of the detecting system for LED display that the embodiment of the present invention three provides.The present embodiment can fit
For detecting the situation of failure to the LED in LED display, the system can be shown based on LED provided in an embodiment of the present invention
The detection circuit of display screen performs, and can also be performed based on the detection method of LED display provided in an embodiment of the present invention.
As shown in figure 3, the system includes：Signal transmitting unit 310, data capture unit 320 and failure judging unit
330, wherein：
The LED that signal transmitting unit 310 is used for one by one into the LED display sends the control for lighting the LED
Signal；
Data capture unit 320 be used to obtaining the LED receive corresponding to the LED display after control signal
Power circuit in sample rate current；
Failure judging unit 330 is used to carry out failure judgement to the corresponding LED according to the sample rate current.
The detecting system of the LED display of the present embodiment is used for the detection electricity for performing the LED display of the various embodiments described above
Road and/or the detection method of LED display, its technical principle is similar with caused technique effect, repeats no more here.
On the basis of above-mentioned technical proposal, if the failure judging unit 330 reaches specifically for the sample rate current
The threshold value of setting, then confirm the LED failure corresponding to the sample rate current.
The detecting system for the LED display that the various embodiments described above are provided can perform what any embodiment of the present invention was provided
LED display detection circuit and/or LED display detection method, possess perform LED display detection circuit and/or
The corresponding functional module of detection method and beneficial effect of LED display.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
- A kind of 1. detection circuit of LED display, it is characterised in that including：Sampling resistor and detection chip；The sampling resistor is series at the power circuit of the LED display, the sampled output of the sampling resistor with it is described The sampling input of detection chip is connected to send sample rate current；The detection chip is used to judge whether the LED is effective according to the sample rate current；The detection chip it is controlled End is connected with the control card of the display screen detects enabling signal to access.
- 2. detection circuit according to claim 1, it is characterised in that the data output end of the detection chip and the control Fabrication is connected, to send testing result.
- 3. detection circuit according to claim 2, it is characterised in that the data output end of the detection chip passes through SPI Bus is connected with the control card.
- 4. detection circuit according to claim 1, it is characterised in that the sampled output of the sampling resistor passes through A/D Change-over circuit is connected with the sampling input of the detection chip.
- A kind of 5. detection method of LED display, it is characterised in that including：The LED into the LED display sends the control signal for lighting the LED one by one；Obtain the LED receive corresponding to sample rate current after control signal in the power circuit of the LED display；Failure judgement is carried out to the corresponding LED according to the sample rate current.
- 6. detection method according to claim 5, it is characterised in that it is described according to the sample rate current to corresponding described LED carries out failure judgement, including：If the sample rate current reaches the threshold value of setting, the LED failure corresponding to the sample rate current is confirmed.
- 7. detection method according to claim 5, it is characterised in that the LED into the LED display one by one The control signal for lighting the LED is sent, including：Metal-oxide-semiconductor corresponding to the LED into the LED display sends control signal one by one, to turn on the metal-oxide-semiconductor so as to lead Lead to the power supply circuit of the LED.
- 8. detection method according to claim 5, it is characterised in that it is described according to the sample rate current to corresponding described LED carries out failure judgement, including：Failure judgement is carried out to the corresponding LED according to the sample rate current after A/D is changed.
- A kind of 9. detecting system of LED display, it is characterised in that including：Signal transmitting unit, the control signal for lighting the LED is sent for the LED one by one into the LED display；Data capture unit, the power supply of the LED display after corresponding control signal is received for obtaining the LED Sample rate current in circuit；Fail judging unit, for carrying out failure judgement to the corresponding LED according to the sample rate current.
- 10. detecting system according to claim 9, it is characterised in that the failure judging unit, if specifically for described Sample rate current reaches the threshold value of setting, then confirms the LED failure corresponding to the sample rate current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710705531.4A CN107464511A (en) | 2017-08-17 | 2017-08-17 | A kind of detection circuit of LED display, method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710705531.4A CN107464511A (en) | 2017-08-17 | 2017-08-17 | A kind of detection circuit of LED display, method and system |
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| CN107464511A true CN107464511A (en) | 2017-12-12 |
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| CN201710705531.4A Pending CN107464511A (en) | 2017-08-17 | 2017-08-17 | A kind of detection circuit of LED display, method and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112509503A (en) * | 2020-11-19 | 2021-03-16 | 深圳市圆周检测技术有限公司 | Detection method and device for LED display screen |
| WO2021109539A1 (en) * | 2019-12-07 | 2021-06-10 | 深圳蓝普科技有限公司 | Led display module, and led display screen and control device therefor |
| CN113129789A (en) * | 2020-01-15 | 2021-07-16 | 深圳市诚信恒佳科技有限公司 | LED display screen fault self-checking method and LED display screen fault polling method |
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