CN104360257A - LED (light emitting diode) leakage current detection method and device - Google Patents
LED (light emitting diode) leakage current detection method and device Download PDFInfo
- Publication number
- CN104360257A CN104360257A CN201410577598.0A CN201410577598A CN104360257A CN 104360257 A CN104360257 A CN 104360257A CN 201410577598 A CN201410577598 A CN 201410577598A CN 104360257 A CN104360257 A CN 104360257A
- Authority
- CN
- China
- Prior art keywords
- led
- tested
- tested led
- image
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses an LED (light emitting diode) leakage current detection method and an LED leakage current detection device. The LED leakage current detection device comprises a delivery device, a CCD (charge coupled device) camera used to capture images of a detected LED, a detection device, a constant current power supply module, an image capture card, a PC (personal computer) and the like. The LED leakage current detection method includes that firstly, an automatic loading and unloading device places the LED on a clamp of a detection platform, a probe on the detection platform lightens the detected LED by using a constant micro current, and then the CCD camera right above the LED captures the images of the detected LED, the captured images are input to the PC through the image capture card, and finally a user can judge whether an electricity leakage phenomenon exists in the detected LED by comparing color values of the captured images with a color value of a standard LED image. Additionally, the LED leakage current detection device not only can detect an electricity leakage situation of the single LED, but also can simultaneously detect a leaky LED among a plurality of LEDs which are connected in parallel or series, or a leaky chip in an LED encapsulated in a COB (chip on board) mode.
Description
Technical field
The present invention relates to the quality testing of LED, particularly relate to a kind of LED creepage detection method and device.
Background technology
LED (light emitting diode) is as the lighting source of a new generation compared with the conventional light source such as incandescent lamp, and have life-span long, the advantage such as light efficiency is high, energy-conserving and environment-protective, become purposes light source product very widely in the last few years, its range of application is constantly large.The fields such as illumination, display, medical treatment all propose strict requirement to LED performance under various environmental conditions.
LED leakage current is also subject to people's attention further as the important parameter affecting LED device performance.The leakage current of LED is commonly defined as: add Weak current measured under size is the reverse voltage of-5V at LED the two poles of the earth.Now LED can Approximate Equivalent be the diode of a PN junction, and its volt-ampere characteristic is similar to general PN junction volt-ampere characteristic, and now measured leakage current is the inverse current of PN junction.The size of LED leakage current is generally several uA and even crosses conference for 0uA, the maximum 10uA that is no more than, LED leakage current and cause the bad phenomenon such as half-light, flicker, dead lamp under normal circumstances.
As mentioned above, the general method detecting LED leakage current adds that size is the reverse voltage of-5V at the two poles of the earth of LED, then measure the leakage current that the electric current passed through is LED.But can only record single led leakage current by the method, if the LED of the LED group of multiple series, parallel or employing COB packing forms, then cannot detect the LED that there is leaky or chip, therefore efficiency is lower.
Electric current when LED normally works, i.e. forward current, size is generally tens microamperes.Even if pass through the electric current of LED much smaller than forward current, LED also can send the light of duskiness, if but the leakage current of LED is larger, then the relatively darker even luminescence of the light now sent.
Summary of the invention
The object of the invention is to the shortcoming and defect overcoming above-mentioned prior art, a kind of LED creepage detection method and device are provided.
The present invention is achieved through the following technical solutions:
A kind of LED leak current detection device, comprising:
Conveying device, controller;
For carrying out the CCD camera 4 of picture catching to tested LED;
Pick-up unit; Constant-current supply module 7;
For the color value of the tested LED image collected and Standard Colors value scope are judged whether tested LED exists the PC 8 of leaky;
For gathering tested LED image and being sent to the image pick-up card of PC 8;
Described controller connects conveying device, pick-up unit, PC 8 respectively;
Described PC 8 connects constant-current supply module 7 and image pick-up card respectively;
Described image pick-up card connects CCD camera 4;
Described CCD camera 4 is arranged at the top of pick-up unit.
Described conveying device comprises conveying belt 1 for transmitting LED, for the LED on clamping conveyer belts 1 and the loading and unloading manipulator 3 be placed on monitor station 6;
Described pick-up unit comprises monitor station 6 and is arranged on two probes 5 of monitor station 6 upper end, two probe 5 respectively with two Electrode connection of constant-current supply module 7, probe moves down when detecting, and is pressed on two electrodes of tested LED respectively, passes to a constant micro-electric current light to LED.
The method adopting above-mentioned LED leak current detection device detection LED whether to leak electricity is as follows:
(1), the Standard Colors value scope of tested LED image is input in PC, the parameter value of setting constant-current supply module;
(2), tested LED sample is placed on conveying belt 1;
(3), tested LED sample delivery to assigned address, is held tested LED clip by loading and unloading manipulator 3 on the fixture being placed into monitor station 6 by conveying belt 1;
(4) the two probes 5, on monitor station 6 move down, and are pressed in respectively on two electrodes of tested LED, light tested LED;
(5) CCD camera carries out picture catching to the tested LED lighted;
(6), image pick-up card gathers the tested LED image captured and is input in PC 8;
(7), PC 8 by input the color value of tested LED image and the color value scope of standard LED image compare, judge whether tested LED exists leakage phenomenon;
(8), loading and unloading manipulator will complete the tested LED clip of detection from monitor station, and detection completes.
In above-mentioned steps (1), the acquisition methods of the Standard Colors value scope of tested LED image is: if continuous current logical when detecting tested LED is I
0, the leakage current of permission is I
r, then (I is passed to respectively to the standard LED sample that does not exist electric leakage
0± I
r) steady current light after, with CCD camera, picture catching is carried out to it, and gathered by image pick-up card and be input in PC 8, PC 8 calculates the color value of two images respectively, and the scope between two color values obtained is Standard Colors value scope.
In above-mentioned steps (7), if tested LED sample is the LED group of multiple series connection or parallel connection, or adopt the LED of COB packing forms, detect that there is the LED of leakage current or the number of LED chip and position goes forward side by side line item further.
The present invention, relative to prior art, has following advantage and effect:
Based on the image recognition vision system that the present invention is formed by CCD camera 4, PC 8 and image pick-up card etc., do not need to measure concrete numerical value and can judge whether tested LED exists leaky, and the drain conditions of the LED group of multiple series, parallel or the LED of employing COB packing forms can be detected simultaneously, substantially increase detection speed and efficiency.In addition, test process realizes robotization completely, greatly reduces manpower consumption, also improves efficiency simultaneously.
The present invention expects the process between blanking from above, be robotization and realize, and after completing the detection of a detected sample LED sample, automatically can carry out the testing of next sample.
Accompanying drawing explanation
Fig. 1 is LED leak current detection device structural representation of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is more specifically described in detail.
Embodiment
As shown in Figure 1.A kind of LED leak current detection device of the present invention, comprising: conveying device, controller; For carrying out the CCD camera 4 of picture catching to tested LED; Pick-up unit; Constant-current supply module 7; For the color value of the tested LED image collected and Standard Colors value scope are judged whether tested LED exists the PC 8 of leaky; For gathering tested LED image and being sent to the image pick-up card of PC 8;
Described controller connects conveying device, pick-up unit, PC 8 respectively;
Described PC 8 connects constant-current supply module 7 and image pick-up card respectively;
Described image pick-up card connects CCD camera 4;
Described CCD camera 4 is arranged at the top of pick-up unit.
Described conveying device comprises conveying belt 1 for transmitting LED, for the LED on clamping conveyer belts 1 and the loading and unloading manipulator 3 be placed on monitor station 6;
Described pick-up unit comprises monitor station 6 and is arranged on two probes 5 of monitor station 6 upper end, two probe 5 respectively with two Electrode connection of constant-current supply module 7, probe moves down when detecting, and is pressed on two electrodes of tested LED respectively, passes to a constant micro-electric current light to LED.
The method adopting above-mentioned LED leak current detection device detection LED whether to leak electricity realizes by following steps:
(1), the Standard Colors value scope of tested LED image is input in PC, the parameter value (for 50uA) of setting constant-current supply module;
(2), tested LED sample is placed on conveying belt 1;
(3), tested LED sample delivery to assigned address, is held tested LED clip by loading and unloading manipulator 3 on the fixture being placed into monitor station 6 by conveying belt 1;
(4) the two probes 5, on monitor station 6 move down, and are pressed on two electrodes of tested LED respectively, light tested LED (passing to a constant micro-electric current);
(5) CCD camera carries out picture catching to the tested LED lighted;
(6), image pick-up card gathers the tested LED image captured and is input in PC 8;
(7), PC 8 by input the color value of tested LED image and the color value scope of standard LED image compare, judge whether tested LED exists leakage phenomenon;
(8), loading and unloading manipulator will complete the tested LED clip of detection from monitor station, and detection completes.
In above-mentioned steps (1), the acquisition methods of the Standard Colors value scope of tested LED image is: if continuous current logical when detecting tested LED is I
0=50uA, the leakage current of permission is I
r=5uA, then pass to (I respectively to the standard LED sample that does not exist electric leakage
0± I
r) steady current light after, with CCD camera, picture catching is carried out to it, and gathered by image pick-up card and be input in PC 8, PC 8 calculates the color value of two images respectively, and the scope between two color values obtained is Standard Colors value scope.
In above-mentioned steps (7), if tested LED sample is the LED group of multiple series connection or parallel connection, or adopt the LED of COB packing forms, detect that there is the LED of leakage current or the number of LED chip and position goes forward side by side line item further.
As mentioned above, this device and method both can detect single led drain conditions, also can detect the LED leaked electricity in the LED of multiple parallel connection, series connection simultaneously, or adopted the chip leaked electricity in the LED of COB packing forms.
As mentioned above, just the present invention can be realized preferably.
Embodiments of the present invention are not restricted to the described embodiments; other are any do not deviate from Spirit Essence of the present invention and principle under do change, modification, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (6)
1. a LED leak current detection device, is characterized in that comprising:
Conveying device, controller;
For carrying out the CCD camera (4) of picture catching to tested LED;
Pick-up unit; Constant-current supply module (7);
For the color value of the tested LED image collected and Standard Colors value scope are judged whether tested LED exists the PC (8) of leaky;
For gathering tested LED image and being sent to the image pick-up card of PC (8);
Described controller connects conveying device, pick-up unit, PC (8) respectively;
Described PC (8) connects constant-current supply module (7) and image pick-up card respectively;
Described image pick-up card connects CCD camera (4);
Described CCD camera (4) is arranged at the top of pick-up unit.
2. LED leak current detection device according to claim 1, is characterized in that: described conveying device comprises conveying belt (1) for transmitting LED, for the LED on clamping conveyer belts (1) and the loading and unloading manipulator (3) be placed on monitor station (6);
Described pick-up unit comprises monitor station (6) and is arranged on two probes (5) of monitor station (6) upper end, two probe (5) respectively with two Electrode connection of constant-current supply module (7), probe moves down when detecting, be pressed on two electrodes of tested LED respectively, pass to a constant micro-electric current to LED and light.
3. adopt the method that according to any one of claim 1 or 2, whether LED leak current detection device detection LED leaks electricity, it is characterized in that following steps:
(1), the Standard Colors value scope of tested LED image is input in PC, the parameter value of setting constant-current supply module;
(2), tested LED sample is placed on conveying belt (1);
(3), tested LED sample delivery to assigned address, is held tested LED clip by loading and unloading manipulator (3) on the fixture being placed into monitor station (6) by conveying belt (1);
(4) the two probes (5), on monitor station (6) move down, and are pressed in respectively on two electrodes of tested LED, light tested LED;
(5) CCD camera carries out picture catching to the tested LED lighted;
(6), image pick-up card gathers the tested LED image captured and is input in PC (8);
(7), PC (8) by input the color value of tested LED image and the color value scope of standard LED image compare, judge whether tested LED exists leakage phenomenon;
(8), loading and unloading manipulator will complete the tested LED clip of detection from monitor station, and detection completes.
4. method according to claim 3, is characterized in that, in step (1), the acquisition methods of the Standard Colors value scope of tested LED image is: if continuous current logical when detecting tested LED is I
0, the leakage current of permission is I
r, then (I is passed to respectively to the standard LED sample that does not exist electric leakage
0± I
r) steady current light after, with CCD camera, picture catching is carried out to it, and gathered by image pick-up card and be input in PC (8), PC (8) calculates the color value of two images respectively, and the scope between two color values obtained is Standard Colors value scope.
5. method according to claim 3, it is characterized in that: in step (7), if tested LED sample is the LED group of multiple series connection or parallel connection, or adopt the LED of COB packing forms, detect that there is the LED of leakage current or the number of LED chip and position goes forward side by side line item further.
6. method according to claim 3, is characterized in that: if continuous current logical when detecting tested LED is I
0, the leakage current of permission is I
rrefer to, if continuous current logical when detecting tested LED is I
0=50uA, the leakage current of permission is I
r=5uA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410577598.0A CN104360257B (en) | 2014-10-24 | 2014-10-24 | A kind of LED creepage detection methods and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410577598.0A CN104360257B (en) | 2014-10-24 | 2014-10-24 | A kind of LED creepage detection methods and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104360257A true CN104360257A (en) | 2015-02-18 |
| CN104360257B CN104360257B (en) | 2017-06-06 |
Family
ID=52527538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410577598.0A Active CN104360257B (en) | 2014-10-24 | 2014-10-24 | A kind of LED creepage detection methods and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104360257B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104815805A (en) * | 2015-03-19 | 2015-08-05 | 南昌大学 | Automatic screening system and screening method for LED chips |
| CN105301523A (en) * | 2015-10-30 | 2016-02-03 | 马瑞利汽车零部件(芜湖)有限公司 | Car lamp bulb detection device |
| CN105974292A (en) * | 2016-06-20 | 2016-09-28 | 刘成 | LED module electric leakage testing method |
| CN108459256A (en) * | 2017-02-20 | 2018-08-28 | 常州星宇车灯股份有限公司 | A kind of vision detection system and detection method of LED car lamp lens module |
| CN109596629A (en) * | 2017-09-30 | 2019-04-09 | 天津天星电子有限公司 | A kind of LED product detection device |
| CN110446932A (en) * | 2017-02-27 | 2019-11-12 | 珀斯特系统有限公司 | The hardware testing of robot assisted |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7414409B1 (en) * | 2005-08-19 | 2008-08-19 | Vladimir Faifer | Non-contact method and apparatus for measurement of leakage current of p-n junctions in IC product wafers |
| US20090136120A1 (en) * | 2007-11-23 | 2009-05-28 | Samsung Electro-Mechanics Co., Ltd. | Led inspection apparatus and led inspection method using the same |
| JP2012170023A (en) * | 2011-02-16 | 2012-09-06 | Ricoh Co Ltd | Image reading device and method of controlling image reading |
| CN103658057A (en) * | 2012-09-19 | 2014-03-26 | 上海纳晶科技有限公司 | Automatic COB-LED (Chip On Board-Light Emitting Diode) spectrophotometry detecting and sorting system |
| CN204203417U (en) * | 2014-10-24 | 2015-03-11 | 华南理工大学 | A kind of LED leak current detection device |
-
2014
- 2014-10-24 CN CN201410577598.0A patent/CN104360257B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7414409B1 (en) * | 2005-08-19 | 2008-08-19 | Vladimir Faifer | Non-contact method and apparatus for measurement of leakage current of p-n junctions in IC product wafers |
| US20090136120A1 (en) * | 2007-11-23 | 2009-05-28 | Samsung Electro-Mechanics Co., Ltd. | Led inspection apparatus and led inspection method using the same |
| JP2012170023A (en) * | 2011-02-16 | 2012-09-06 | Ricoh Co Ltd | Image reading device and method of controlling image reading |
| CN103658057A (en) * | 2012-09-19 | 2014-03-26 | 上海纳晶科技有限公司 | Automatic COB-LED (Chip On Board-Light Emitting Diode) spectrophotometry detecting and sorting system |
| CN204203417U (en) * | 2014-10-24 | 2015-03-11 | 华南理工大学 | A kind of LED leak current detection device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104815805A (en) * | 2015-03-19 | 2015-08-05 | 南昌大学 | Automatic screening system and screening method for LED chips |
| CN105301523A (en) * | 2015-10-30 | 2016-02-03 | 马瑞利汽车零部件(芜湖)有限公司 | Car lamp bulb detection device |
| CN105974292A (en) * | 2016-06-20 | 2016-09-28 | 刘成 | LED module electric leakage testing method |
| CN108459256A (en) * | 2017-02-20 | 2018-08-28 | 常州星宇车灯股份有限公司 | A kind of vision detection system and detection method of LED car lamp lens module |
| CN110446932A (en) * | 2017-02-27 | 2019-11-12 | 珀斯特系统有限公司 | The hardware testing of robot assisted |
| CN109596629A (en) * | 2017-09-30 | 2019-04-09 | 天津天星电子有限公司 | A kind of LED product detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104360257B (en) | 2017-06-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104360257A (en) | LED (light emitting diode) leakage current detection method and device | |
| CN204203417U (en) | A kind of LED leak current detection device | |
| CN106780521B (en) | Screen light leakage detection method, system and device | |
| CN104819829B (en) | A kind of full-automatic LED charactron photodetector system and its method | |
| CN201707304U (en) | Device for automated optical inspection of surface of product | |
| US10554172B2 (en) | Illuminated outdoor luminescence imaging of photovoltaic modules | |
| KR20120037352A (en) | Detection method and detection device for wafer level led chips and transparent probe card thereof | |
| CN106204602B (en) | The anti-part detection method of element and system | |
| CN103175624A (en) | Non-contact LED junction temperature measurement method and device | |
| CN104344944A (en) | Photoelectrical detecting system of LED (light emitting diode) digital tube and photoelectrical detecting method of photoelectrical detecting system | |
| JP2016220471A (en) | Evaluation method and evaluation system for photovoltaic power generation system | |
| CN108120353A (en) | A kind of flash hole detection device and its method based on smart camera | |
| CN108072664B (en) | Appearance detection system and method | |
| CN104950489B (en) | A kind of liquid crystal display detection method | |
| CN205175664U (en) | Photoelectric detection system of LED charactron | |
| CN111443509A (en) | Method for detecting L CD liquid crystal screen black and white spots and flicker defects | |
| KR20170125183A (en) | Method for judging quality of LED module and Apparatus for judging quality of LED module | |
| CN103697838A (en) | Machine vision technology-based surface mounted device PIN smoothness detection equipment | |
| TW201428310A (en) | Method and apparatus for testing light-emitting device | |
| CN111079831A (en) | Intelligent optical detection sample characteristic and flaw automatic marking method and device | |
| CN102478528A (en) | Infrared tester for internal quality of glass and test method thereof | |
| CN102486534A (en) | Photoelectric parameter measuring system of LED fluorescent lamp | |
| CN105915814B (en) | A kind of method and system of controlling terminal screen light filling | |
| TWM447988U (en) | Inspection device | |
| CN104299549A (en) | Screen body detection counterpoint device and screen body detection counterpoint method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |