CN104360257B - A kind of LED creepage detection methods and device - Google Patents
A kind of LED creepage detection methods and device Download PDFInfo
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- CN104360257B CN104360257B CN201410577598.0A CN201410577598A CN104360257B CN 104360257 B CN104360257 B CN 104360257B CN 201410577598 A CN201410577598 A CN 201410577598A CN 104360257 B CN104360257 B CN 104360257B
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Abstract
The invention discloses a kind of LED creepage detection methods and device, including conveying device, for carrying out the CCD camera of picture catching, detection means, constant-current supply module, image pick-up card, PC etc. to being tested LED；Be placed on tested LED on the fixture of monitor station by automatic loading and unloading device first, a constant micro-current is passed to by the probe on monitor station to tested LED to light, then the CCD camera directly over LED catches to the image of LED, the image for capturing is input in PC by image pick-up card, carries out judging that tested LED whether there is leaky by color value is contrasted with standard LED image.Additionally, the present apparatus both can detect single led drain conditions, the LED leaked electricity in multiple LED in parallel, series connection also can be simultaneously detected, or using the chip leaked electricity in the LED of COB packing forms.
Description
Technical field
The present invention relates to the quality testing of LED, more particularly to a kind of LED creepage detection methods and device.
Background technology
LED (light emitting diode) as a new generation lighting source compared with the conventional light sources such as incandescent lamp, with long lifespan,
Light efficiency is high, energy-conserving and environment-protective the advantages of, as the extremely wide light source product of purposes in the last few years, its range of application is constantly big.According to
Performance of the field such as bright, display, medical treatment all to LED under various environmental conditions proposes strict requirements.
LED leakage currents are also valued by people further as the important parameter of influence LED device performance.LED
Leakage current be commonly defined as：Measured Weak current under being the backward voltage of -5V plus size at LED the two poles of the earth.Now LED
Can Approximate Equivalent be a diode for PN junction, its C-V characteristic is similar to general PN junction C-V characteristic, now measured
Leakage current is the reverse current of PN junction.The size of LED leakage currents is generally several uA even 0uA under normal circumstances, maximum
No more than 10uA, LED leakage currents cross conference and cause the bad phenomenons such as half-light, flicker, dead lamp.
As described above, the method for typically detection LED leakage currents is plus the backward voltage that size is -5V at the two poles of the earth of LED,
The electric current for the passing through as leakage current of LED is measured again.But, single led leakage current can only be measured with the method, if many
The LED groups of individual series, parallel or the LED using COB packing forms, then cannot detect the LED that there is leaky or
Chip, thus it is less efficient.
Electric current during LED normal works, i.e. forward current, size are generally tens microamperes.Even if the electric current by LED is remote
Less than forward current, LED can also send the light of duskiness, but if the leakage current of LED is bigger, then the light for now sending is relative
It is more dark not light even.
The content of the invention
A kind of shortcoming and defect it is an object of the invention to overcome above-mentioned prior art, there is provided LED leakage current test sides
Method and device.
The present invention is achieved through the following technical solutions：
A kind of LED leak current detection devices, including：
Conveying device, controller；
For carrying out the CCD camera 4 of picture catching to being tested LED；
Detection means；Constant-current supply module 7；
The color value of the tested LED image for that will collect judges whether tested LED deposits with Standard Colors value scope
In the PC 8 of leaky；
For gathering tested LED image and being sent to the image pick-up card of PC 8；
The controller connects conveying device, detection means, PC 8 respectively；
The PC 8 connects constant-current supply module 7 and image pick-up card respectively；
Described image capture card connects CCD camera 4；
The CCD camera 4 is arranged at the top of detection means.
The conveying device is including the conveyer belt 1 for transmitting LED, for the LED on clamping conveyer belts 1 and is placed into inspection
Loading and unloading manipulator 3 on scaffold tower 6；
The detection means includes monitor station 6 and is arranged on double probes 5 of the upper end of monitor station 6, double probes 5 respectively with constant current
Two electrodes connection of power module 7, probe is moved down in detection, is press respectively against on two electrodes of tested LED, gives
LED passes to a constant micro-current and is lighted.
Whether the method leaked electricity using above-mentioned LED leak current detection devices detection LED is as follows：
(1), the Standard Colors value scope of tested LED image is input in PC, the parameter of constant-current supply module is set
Value；
(2), tested LED samples are placed on conveyer belt 1；
(3), tested LED sample deliveries to specified location are held tested LED clip by loading and unloading manipulator 3 and are put by conveyer belt 1
Put on the fixture of monitor station 6；
(4), the double probes 5 on monitor station 6 are moved down, and are press respectively against on two electrodes of tested LED, to being tested LED
Lighted；
(5) CCD camera carries out picture catching to the tested LED for lighting；
(6), image pick-up card is acquired and is input in PC 8 to the tested LED image for capturing；
(7), PC 8 is compared the color value of tested LED image being input into and the color value scope of standard LED image
Compared with judging that tested LED whether there is leakage phenomenon；
(8), loading and unloading manipulator will complete the tested LED clip of detection from monitor station, and detection is completed.
The acquisition methods of the Standard Colors value scope of tested LED image are in above-mentioned steps (1)：If to tested LED detections
When logical constant current be I0, it is allowed to leakage current be IR, then (I is passed to respectively to a standard LED sample in the absence of electric leakage0±
IR) constant current lighted after, picture catching is carried out to it with CCD camera, and gathered and be input into by image pick-up card
To in PC 8, PC 8 calculates two color values of image respectively, the scope as standard face between two color values for obtaining
Colour scope.
In above-mentioned steps (7), if tested LED samples are multiple LED groups in series or in parallel, or using COB encapsulation
The LED of form, further detects and there is the LED of leakage current or the number of LED chip and position and recorded.
The present invention has the following advantages and effect relative to prior art：
The present invention based on the image recognition vision system of the compositions such as CCD camera 4, PC 8 and image pick-up card, no
Need to judge by measuring concrete numerical value tested LED with the presence or absence of leaky, and can simultaneously detect multiple series, parallel
The drain conditions of LED groups or the LED using COB packing forms, substantially increase detection speed and efficiency.In addition, testing
Journey fully achieves automation, greatly reduces manpower consumption, while also improving efficiency.
The present invention expects the process between blanking from above, is automation and realizes, and one detected sample LED sample of completion
After detection, the detection work of next sample can be automatically carried out.
Brief description of the drawings
Fig. 1 is LED leak current detection devices structural representation of the present invention.
Specific embodiment
The present invention is more specifically described in detail with reference to specific embodiment.
Embodiment
As shown in Figure 1.A kind of LED leak current detection devices of the present invention, including：Conveying device, controller；For to tested
LED carries out the CCD camera 4 of picture catching；Detection means；Constant-current supply module 7；For the tested LED image that will be collected
Color value and Standard Colors value scope judge PCs 8 of the tested LED with the presence or absence of leaky；For gathering tested LED
Image is simultaneously sent to the image pick-up card of PC 8；
The controller connects conveying device, detection means, PC 8 respectively；
The PC 8 connects constant-current supply module 7 and image pick-up card respectively；
Described image capture card connects CCD camera 4；
The CCD camera 4 is arranged at the top of detection means.
The conveying device is including the conveyer belt 1 for transmitting LED, for the LED on clamping conveyer belts 1 and is placed into inspection
Loading and unloading manipulator 3 on scaffold tower 6；
The detection means includes monitor station 6 and is arranged on double probes 5 of the upper end of monitor station 6, double probes 5 respectively with constant current
Two electrodes connection of power module 7, probe is moved down in detection, is press respectively against on two electrodes of tested LED, gives
LED passes to a constant micro-current and is lighted.
Whether the method leaked electricity using above-mentioned LED leak current detection devices detection LED can be achieved by the steps of：
(1), the Standard Colors value scope of tested LED image is input in PC, the parameter of constant-current supply module is set
Value (being 50uA)；
(2), tested LED samples are placed on conveyer belt 1；
(3), tested LED sample deliveries to specified location are held tested LED clip by loading and unloading manipulator 3 and are put by conveyer belt 1
Put on the fixture of monitor station 6；
(4), the double probes 5 on monitor station 6 are moved down, and are press respectively against on two electrodes of tested LED, to being tested LED
(passing to a constant micro-current) is lighted；
(5) CCD camera carries out picture catching to the tested LED for lighting；
(6), image pick-up card is acquired and is input in PC 8 to the tested LED image for capturing；
(7), PC 8 is compared the color value of tested LED image being input into and the color value scope of standard LED image
Compared with judging that tested LED whether there is leakage phenomenon；
(8), loading and unloading manipulator will complete the tested LED clip of detection from monitor station, and detection is completed.
The acquisition methods of the Standard Colors value scope of tested LED image are in above-mentioned steps (1)：If to tested LED detections
When logical constant current be I0=50uA, it is allowed to leakage current be IR=5uA, then to a standard LED sample in the absence of electric leakage point
(I is not passed to0±IR) constant current lighted after, picture catching is carried out to it with CCD camera, and by image pick-up card
Gather and be input in PC 8, PC 8 calculates two color values of image respectively, the scope between two color values for obtaining
As Standard Colors value scope.
In above-mentioned steps (7), if tested LED samples are multiple LED groups in series or in parallel, or using COB encapsulation
The LED of form, further detects and there is the LED of leakage current or the number of LED chip and position and recorded.
As described above, the present apparatus and method both can detect single led drain conditions, multiple also can be simultaneously detected simultaneously
The LED leaked electricity in connection, the LED of series connection, or using the chip leaked electricity in the LED of COB packing forms.
As described above, the present invention can be better realized.
Embodiments of the present invention are simultaneously not restricted to the described embodiments, and other are any without departing from Spirit Essence of the invention
With the change, modification, replacement made under principle, combine, simplify, should be equivalent substitute mode, be included in of the invention
Within protection domain.
Claims (3)
1. a kind of method that whether LED leak current detection devices detection LED leaks electricity, the LED leak current detection devices include：
Conveying device, controller；
For carrying out the CCD camera (4) of picture catching to being tested LED；
Detection means；Constant-current supply module (7)；
The color value of the tested LED image for that will collect judges tested LED with the presence or absence of leakage with Standard Colors value scope
The PC (8) of electrical phenomena；
For gathering tested LED image and being sent to the image pick-up card of PC (8)；
The controller connects conveying device, detection means, PC (8) respectively；
The PC (8) connects constant-current supply module (7) and image pick-up card respectively；
Described image capture card connects CCD camera (4)；
The CCD camera (4) is arranged at the top of detection means；
The conveying device is including the conveyer belt (1) for transmitting LED, for the LED on clamping conveyer belts (1) and is placed into inspection
Loading and unloading manipulator (3) on scaffold tower (6)；
The detection means includes monitor station (6) and is arranged on double probes (5) of monitor station (6) upper end, double probes (5) respectively with
Two electrodes connection of constant-current supply module (7), probe is moved down in detection, is press respectively against two electrodes of tested LED
On, pass to a constant micro-current to LED and lighted；
It is characterized in that the method whether detection LED leaks electricity comprises the following steps：
(1), the Standard Colors value scope of tested LED image is input in PC, the parameter value of constant-current supply module is set；
(2), tested LED samples are placed on conveyer belt (1)；
(3), tested LED sample deliveries to specified location are held tested LED clip by loading and unloading manipulator (3) and are put by conveyer belt (1)
Put on the fixture of monitor station (6)；
(4), the double probes (5) on monitor station (6) are moved down, and are press respectively against on two electrodes of tested LED, to being tested LED
Lighted；
(5) CCD camera carries out picture catching to the tested LED for lighting；
(6), image pick-up card is acquired and is input in PC (8) to the tested LED image for capturing；
(7), be compared for the color value of tested LED image being input into and the color value scope of standard LED image by PC (8),
Judge that tested LED whether there is leakage phenomenon；
(8), loading and unloading manipulator will complete the tested LED clip of detection from monitor station, and detection is completed；
The acquisition methods of the Standard Colors value scope of tested LED image are in step (1)：If to being tested perseverance logical when LED is detected
Electric current is I0, it is allowed to leakage current be IR, then (I is passed to respectively to a standard LED sample in the absence of electric leakage0±IR) perseverance
Determine after electric current lighted, to carry out picture catching to it with CCD camera, and gathered by image pick-up card and be input to PC
(8) in, PC (8) calculates two color values of image respectively, the scope as Standard Colors between two color values for obtaining
Value scope.
2. method according to claim 1, it is characterised in that：In step (7), if tested LED samples be multiple series connection or
Person's LED groups in parallel, or using the LED of COB packing forms, further detect there is the LED or LED chip of leakage current
Number and position and recorded.
3. method according to claim 1, it is characterised in that：If being I to being tested constant current logical when LED is detected0, it is allowed to
Leakage current be IRRefer to, if being I to being tested constant current logical when LED is detected0=50uA, it is allowed to leakage current be IR=5uA.
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| CN201410577598.0A CN104360257B (en) | 2014-10-24 | 2014-10-24 | A kind of LED creepage detection methods and device |
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| CN104815805B (en) * | 2015-03-19 | 2017-08-11 | 南昌大学 | The automatic screening system and screening technique of a kind of LED chip |
| 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 |
| WO2018154586A1 (en) * | 2017-02-27 | 2018-08-30 | Posit Systems Ltd | Robot-assisted hardware testing |
| 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 |
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| KR101101132B1 (en) * | 2007-11-23 | 2012-01-12 | 삼성엘이디 주식회사 | LED inspection apparatus and inspection method using the same |
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| 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 |
| 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 |
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