CN103093714A - Detecting device and detecting method of light emitting diode (LED) display screen driving board - Google Patents
Detecting device and detecting method of light emitting diode (LED) display screen driving board Download PDFInfo
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- CN103093714A CN103093714A CN2011103386791A CN201110338679A CN103093714A CN 103093714 A CN103093714 A CN 103093714A CN 2011103386791 A CN2011103386791 A CN 2011103386791A CN 201110338679 A CN201110338679 A CN 201110338679A CN 103093714 A CN103093714 A CN 103093714A
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Abstract
The invention discloses a detecting device and a detecting method of a light emitting diode (LED) display screen driving board. The detecting device of the LED display screen driving board comprises a simulating display screen which is composed of a plurality of LEDs, a sampling circuit, a power supply, a power changing-over switch, a main control circuit and an acousto-optic indicating circuit, wherein the input end of the simulating display screen is used for being connected with the output end of the LED display screen driving board, the sampling circuit is used for collecting working current or working voltage of the simulating display screen, the power changing-over switch is used for changing-over of the output voltage of power supplies, the output end of the power changing-over switch provides power for the LED display screen driving board, the main control circuit is used for outputting control signals for the power changing-over switch and the LED display screen driving board and receiving and processing feedback signals of the sampling circuit, and the acousto-optic indicating circuit is connected with and controlled by the main control circuit and is used for indicating whether the feedback signals of the sampling circuit are normal or not. According to the detecting device and the detecting method of the LED display screen driving board, examination of the performance of LED driving parts of the LED display screen driving board is achieved through three main detection indexes, and detecting results can be displayed visually.
Description
Technical field
The present invention relates to a kind of pick-up unit, the LED that is used for the LED display drive plate drives the detection of function.
Background technology
Because the LED display model is numerous, specification is complicated, in existing LED display drive plate pick-up unit, does not comprise the Function detection of LED drive part, causes the display product of the dark problem of numerous pictures to come into the market.
Summary of the invention
Whether the LED drive part that the invention provides a kind of highly versatile, can quick and precisely detect the LED display drive plate works, but and the pick-up unit of visual display detecting result, solved the LED drive part function of display in non-detectable problem of board production stage.
A kind of pick-up unit of LED display drive plate comprises:
By the simulating display screen that some LED form, the input end of simulating display screen is used for being connected with the output terminal of described LED display drive plate;
Sample circuit is for the working current or the voltage that gather described simulating display screen;
Power supply and the power change-over switch that is used for the output voltage of Switching power, the output terminal of power change-over switch is powered to described LED display drive plate;
Governor circuit is used for receiving and process the feedback signal of described sample circuit to described power change-over switch and LED display drive plate output control signal;
The acousto-optic indicating circuit accesses and is controlled by described governor circuit, be used to indicate described sample circuit feedback signal normally whether.
Described simulating display screen is comprised of some LED, and in order to simulate the display of different model, power, described some LED are divided into four groups, and the LED in every group is at least two, is provided with the quantity change-over switch, but is used for switching the quantity of the LED of every group of conducting.
The LED display drive plate can be lighted LED to simulating display screen output services voltage, but can select the quantity of the LED of conducting in every group by the quantity change-over switch, with the display of simulation different model, power.
Described power supply can adopt a plurality of direct supplys, and described power change-over switch can adopt a plurality of relays, and the various combination by relay can change output voltage, to detect the power adaptation of LED display drive plate.Described power supply also can be direct or indirect to other consuming parts power supplies such as governor circuit.
Working current or the voltage of described sample circuit acquisition testing simulating display screen judge by being sent to main control chip after analog to digital conversion whether the output of LED display drive plate is normal as can be known, then shows result by the acousto-optic indicating circuit.
Described governor circuit can adopt the integrated chips such as single-chip microcomputer.By to power change-over switch output control signal, can change the operating voltage of LED display drive plate, to detect the power adaptation of LED display drive plate.
Whether described governor circuit can work to detect the LED display drive plate by exporting control signal to the LED display drive plate and gathering feedback signal.
Described governor circuit can change the output voltage of LED display drive plate to LED display drive plate output control signal, can realize the brightness adjustment of simulating display screen, with the respective performances of test LED display drive plate.
LED display drive plate of the present invention is LED display drive plate to be tested, as preferably, can utilize existing fixture (being existing other performance test devices of LED display drive plate that are used for detecting) that the LED display drive plate is installed for the ease of test, and described acousto-optic indicating circuit also can be arranged on described fixture.
Line between LED display drive plate and power change-over switch, simulating display screen and governor circuit fully can utilize the existing interface of fixture, realizes power supply and communication.
In order to improve detection efficiency, as preferably, described pick-up unit is multi-set parallel, i.e. a plurality of pick-up unit common sources, and can work simultaneously.
When described pick-up unit was multi-set parallel, for example described power change-over switch, simulating display screen, quantity change-over switch, sample circuit and governor circuit were corresponding many groups of arranging, and described power supply is that many groups share.
Take four groups as example, comprise and adopt four simulating display screens, four the quantity change-over switches corresponding with these four simulating display screens, four sample circuits, four governor circuits and four power change-over switchs, can test four LED display drive plates simultaneously respectively.Can independently work separately between every group.
For convenient processing, described power change-over switch, simulating display screen, quantity change-over switch, sample circuit and governor circuit are corresponding four groups of arranging, wherein four simulating display screens and four quantity change-over switches are integrated on first circuit board, and are placed in top layer; Four sample circuits and four governor circuits are integrated on second circuit board, and are placed in the middle level; Power supply and four power change-over switchs are integrated on the tertiary circuit plate, and are placed in bottom.Whole pick-up unit is packaged into box-packed structure, removable replacing between every layer.Power supply can be simultaneously to four groups of foregoing circuit power supplies.
The simulating display screen that the present invention utilizes LED to consist of selects different LED numbers to mate actual LED display specification by power change-over switch, has solved actual LED display model numerous, and specification is complicated, is difficult for the problem of integrating.And this simulating display screen is connected on the LED display drive plate by existing fixture, directly driven by the LED display drive plate, and by detecting the associated electrical performance data, judge whether LED drives function normal.And can realize the automatic detection of the functions such as brightness adjustment, power adaptation.
The present invention also provides a kind of method of testing of LED display drive plate, comprises the following steps of carrying out with any order:
(1) to LED display drive plate input the first control signal, make the LED display drive plate drive the LED that sets quantity, detect the operating voltage of LED or electric current whether normal and show;
(2) to LED display drive plate input the second control signal, make the LED display drive plate drive the LED that sets quantity and change the LED display drive plate to the voltage of LED output, detect the LED working current and whether change accordingly with the operating voltage of LED, and show;
(3) to the different voltage of LED display drive plate input, make the LED display drive plate drive the LED that sets quantity under different operating voltage, detect the operating voltage of LED or electric current whether normally estimating the power adaptation of LED display drive plate, and show.
The present invention is directed to the imperfection that detects index in prior art and proposed corresponding detection method, detection by three leading indicators can further guarantee and improve LED display drive plate outgoing, pick-up unit of the present invention is also that thinking same as this proposes, and can detect for three leading indicators in step (1)～(3).
Method of testing of the present invention can be utilized pick-up unit of the present invention, the following steps of carrying out with any order:
(1) described power supply is powered to described LED display drive plate by described power change-over switch, described governor circuit is to described LED display drive plate input the first control signal, make the LED display drive plate drive described simulating display screen, utilize described sample circuit to gather working current or the voltage of simulating display screen and be sent to governor circuit and judge utilize described acousto-optic indicating circuit whether working current or the voltage of simulating display screen are normally shown;
(2) described power supply is powered to described LED display drive plate by described power change-over switch, input the second control signal by described governor circuit to described LED display drive plate, make the LED display drive plate drive described simulating display screen, change the LED display drive plate to the voltage of simulating display screen output, utilize described sample circuit gather the working current of simulating display screen and be sent to described governor circuit, governor circuit judges that whether the working current of described simulating display screen changes accordingly with the operating voltage of simulating display screen, and utilize described acousto-optic indicating circuit that judged result is shown,
(3) described power supply is powered to described LED display drive plate by described power change-over switch, described governor circuit is controlled described power change-over switch to the different voltage of described LED display drive plate input, make the LED display drive plate drive described simulating display screen under different operating voltage, utilize described sample circuit detect operating voltage or the electric current of simulating display screen and be sent to described governor circuit, governor circuit is according to the operating voltage of simulating display screen or the power adaptation of electric current judgement LED display drive plate, and utilize described acousto-optic indicating circuit that judged result is shown.
In step (3), the different operating voltage of described LED display drive plate is respectively 10V, 12V and 15V.
Described simulating display screen is comprised of some LED, and in each step, the quantity of the LED of participation test is identical.Working current or the operating voltage of simulating display screen that the working current of LED or operating voltage are namely corresponding.
Described some LED are divided into four groups, and the LED in every group is at least two.As preferably, in order to simulate the display of different model, power, in every group of LED, the quantity that participates in the LED of test is adjustable.
Detection method of the present invention has made up the blank of existing detection means, realizes considering the LED drive part performance of LED display drive plate by three main indexs that detect.Whole process can be integrated in the detection station in the display circuit board assembly line, does not take existing display circuit plate conventional func detection time, but and visual display detecting result.
Description of drawings
Fig. 1 is the structured flowchart of pick-up unit of the present invention.
Embodiment
Referring to accompanying drawing, the pick-up unit of a kind of LED display drive plate of the present invention comprises:
By the simulating display screen that some LED form, the input end of simulating display screen is used for being connected with the output terminal of LED display drive plate; The some LED of simulating display screen form the LED lamp group in i.e. figure, in order to simulate the display of different model, power, some LED are divided into four groups, and the LED in every group is eight, be provided with the quantity change-over switch, but be used for switching the quantity of the LED of every group of conducting (participating in test).
Sample circuit, sample circuit gathers working current or the voltage of simulating display screen, judges by being sent to main control chip after analog to digital conversion, and whether the output of LED display drive plate is normal as can be known, then shows result by the acousto-optic indicating circuit;
Power supply and the power change-over switch that is used for the output voltage of Switching power, the output terminal of power change-over switch is powered to described LED display drive plate.
Power supply can adopt four direct supplys, and voltage is respectively 5V, 10V, 12V and 15V, and power change-over switch can adopt a plurality of relays, and the different conditions by relay arranges combination and can change output voltage; Wherein voltage be the direct supply of 5V mainly to governor circuit power supply, and its excess-three is used for test LED display drive plate.
Governor circuit is used for receiving and process the feedback signal of sample circuit to power change-over switch and LED display drive plate output control signal; Governor circuit can adopt single-chip microcomputer.
The acousto-optic indicating circuit accesses and is controlled by governor circuit, be used to indicate sample circuit feedback signal normally whether.
In the present embodiment, the acousto-optic indicating circuit is arranged on existing fixture, after directly being arranged on LED display drive plate to be detected on fixture during detection, line between LED display drive plate and power change-over switch, simulating display screen and governor circuit fully can utilize the existing interface of fixture, realizes power supply and communication.
In order to improve detection efficiency, power change-over switch, simulating display screen, sample circuit, governor circuit are corresponding four groups of arranging, and power supply is that many groups are shared, works alone between every group, can test simultaneously four LED display drive plates like this.
For convenient processing, four simulating display screens are integrated on first circuit board, and are placed in top layer, and the quantity switch is also four groups, is arranged on top layer, be placed near corresponding simulating display screen.
Four sample circuits and four governor circuits are integrated on second circuit board, and are placed in the middle level; Power supply and four power change-over switchs are integrated on the tertiary circuit plate, and are placed in bottom; Whole pick-up unit is packaged into box-packed structure, removable replacing between every layer.Power supply can be simultaneously to four groups of circuit supplies.
The acousto-optic indicating circuit comprises and four groups of corresponding pilot lamp respectively, and when only having test normal, the pilot lamp of correspondence just can be lighted, also comprise hummer in the acousto-optic indicating circuit, when four LED display drive plates detect simultaneously, if having one undesired, the warning of namely sounding.
When utilizing pick-up unit of the present invention to carry out the test of LED display drive plate, (take wherein one group as example) power supply powers to the LED display drive plate by power change-over switch, model, power according to the display of simulating before test select to participate in simulating display screen the quantity of the LED of test by the quantity change-over switch, also comprise with any order and carry out following steps:
(1) governor circuit is to LED display drive plate input the first control signal, make the LED display drive plate drive the LED that sets quantity (setting by the quantity change-over switch in advance) in simulating display screen, whether operating voltage or electric current that sample circuit detects LED be normal, light acousto-optic indicating circuit indicating lamp when normal, otherwise utilize the warning of sounding of hummer in the acousto-optic indicating circuit.
(2) governor circuit is to LED display drive plate input second control signal of correspondence, the LED display drive plate is driven set the LED of quantity in simulating display screen and change the LED display drive plate to the voltage of LED output, whether corresponding sample circuit detects the LED working current changes accordingly with the operating voltage of LED, light the pilot lamp in the acousto-optic indicating circuit when normal, otherwise utilize the warning of sounding of hummer in the acousto-optic indicating circuit.
(3) governor circuit is by controlling power change-over switch to the different voltage of LED display drive plate input, be respectively 10V, 12V and 15V, power change-over switch can be respectively with 10V, three relays parallel with one another that 12V and 15V direct supply are corresponding, opening different relays can be to the different voltage of LED display drive plate input, make the LED display drive plate drive the LED that sets quantity in simulating display screen under different operating voltage, whether operating voltage or electric current that sample circuit detects LED be normal to estimate the power adaptation of LED display drive plate, light pilot lamp corresponding in the acousto-optic indicating circuit when normal, otherwise utilize the warning of sounding of hummer in the acousto-optic indicating circuit.
The present invention has made up the blank of existing detection means, realizes considering the LED drive part performance of LED display drive plate by three main indexs that detect.Whole process can be integrated in the detection station in the display circuit board assembly line, does not take existing display circuit plate conventional func detection time, but and visual display detecting result.
Claims (10)
1. the pick-up unit of a LED display drive plate, is characterized in that, comprising:
By the simulating display screen that some LED form, the input end of simulating display screen is used for being connected with the output terminal of described LED display drive plate;
Sample circuit is for the working current or the voltage that gather described simulating display screen;
Power supply and the power change-over switch that is used for the output voltage of Switching power, the output terminal of power change-over switch is powered to described LED display drive plate;
Governor circuit is used for receiving and process the feedback signal of described sample circuit to described power change-over switch and LED display drive plate output control signal;
The acousto-optic indicating circuit accesses and is controlled by described governor circuit, be used to indicate described sample circuit feedback signal normally whether.
2. the pick-up unit of LED display drive plate as claimed in claim 1, is characterized in that, described simulating display screen is comprised of some LED, and described some LED are divided into four groups, and the LED in every group is at least two.
3. the pick-up unit of LED display drive plate as claimed in claim 2, is characterized in that, but be provided with the quantity change-over switch for the number of the LED that switches every group of conducting.
4. the pick-up unit of LED display drive plate as claimed in claim 3, is characterized in that, described pick-up unit is multi-set parallel, and described power supply is that many groups share.
5. the pick-up unit of LED display drive plate as claimed in claim 4, it is characterized in that, described power change-over switch, simulating display screen, quantity change-over switch, sample circuit and governor circuit are corresponding four groups of arranging, wherein four simulating display screens and four quantity change-over switches are integrated on first circuit board, and are placed in top layer; Four sample circuits and four governor circuits are integrated on second circuit board, and are placed in the middle level; Power supply and four power change-over switchs are integrated on the tertiary circuit plate, and are placed in bottom.
6. the method for testing of a LED display drive plate, is characterized in that, utilizes the pick-up unit of LED display drive plate claimed in claim 1, the following steps of carrying out with any order:
(1) described power supply is powered to described LED display drive plate by described power change-over switch, input the first control signal by described governor circuit to described LED display drive plate, make the LED display drive plate drive described simulating display screen, utilize described sample circuit to gather working current or the voltage of simulating display screen and be sent to governor circuit and judge utilize described acousto-optic indicating circuit whether working current or the voltage of simulating display screen are normally shown;
(2) described power supply is powered to described LED display drive plate by described power change-over switch, input the second control signal by described governor circuit to described LED display drive plate, make the LED display drive plate drive described simulating display screen, change the LED display drive plate to the voltage of simulating display screen output, utilize described sample circuit gather the working current of simulating display screen and be sent to described governor circuit, governor circuit judges that whether the working current of described simulating display screen changes accordingly with the operating voltage of simulating display screen, and utilize described acousto-optic indicating circuit that judged result is shown,
(3) described power supply is powered to described LED display drive plate by described power change-over switch, described governor circuit is controlled described power change-over switch to the different voltage of described LED display drive plate input, make the LED display drive plate drive described simulating display screen under different operating voltage, utilize described sample circuit detect operating voltage or the electric current of simulating display screen and be sent to described governor circuit, governor circuit is according to the operating voltage of simulating display screen or the power adaptation of electric current judgement LED display drive plate, and utilize described acousto-optic indicating circuit that judged result is shown.
7. the method for testing of LED display drive plate as claimed in claim 6, is characterized in that, in step (3), the different operating voltage of described LED display drive plate is respectively 10V, 12V and 15V.
8. the method for testing of LED display drive plate as claimed in claim 7, is characterized in that, described simulating display screen is comprised of some LED, and in each step, the quantity of the LED of participation test is identical.
9. the method for testing of LED display drive plate as claimed in claim 8, is characterized in that, described some LED are divided into four groups, and the LED in every group is at least two.
10. the method for testing of LED display drive plate as claimed in claim 9, is characterized in that, in every group of LED, the quantity that participates in the LED of test is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103386791A CN103093714A (en) | 2011-11-01 | 2011-11-01 | Detecting device and detecting method of light emitting diode (LED) display screen driving board |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103386791A CN103093714A (en) | 2011-11-01 | 2011-11-01 | Detecting device and detecting method of light emitting diode (LED) display screen driving board |
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| CN2011103386791A Pending CN103093714A (en) | 2011-11-01 | 2011-11-01 | Detecting device and detecting method of light emitting diode (LED) display screen driving board |
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| CN103531139A (en) * | 2013-10-18 | 2014-01-22 | 台龙电子（昆山）有限公司 | CCD (Charge Coupled Device) amplifier detector for LED (Light Emitting Diode) display screen |
| CN103728531A (en) * | 2013-12-25 | 2014-04-16 | 苏州欢颜电气有限公司 | Testing device for LED system control board |
| CN104950239A (en) * | 2014-03-25 | 2015-09-30 | 深圳市海洋王照明工程有限公司 | Backlight driving detection circuit |
| CN105717438A (en) * | 2016-01-29 | 2016-06-29 | 环鸿电子（昆山）有限公司 | Current signal testing device and method |
| CN108445378A (en) * | 2018-06-06 | 2018-08-24 | 广州市雅江光电设备有限公司 | A kind of LED drive board test device |
| CN108710077A (en) * | 2018-08-07 | 2018-10-26 | 中科芯集成电路股份有限公司 | A kind of electronic device of test circuit break-make |
| CN110211520A (en) * | 2019-06-10 | 2019-09-06 | 惠科股份有限公司 | Display panel debug circuit |
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| CN103531139A (en) * | 2013-10-18 | 2014-01-22 | 台龙电子（昆山）有限公司 | CCD (Charge Coupled Device) amplifier detector for LED (Light Emitting Diode) display screen |
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| CN110211520A (en) * | 2019-06-10 | 2019-09-06 | 惠科股份有限公司 | Display panel debug circuit |
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Application publication date: 20130508 |