CN101412026B - Method for sorting white light LED - Google Patents
Method for sorting white light LED Download PDFInfo
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- CN101412026B CN101412026B CN2008102186512A CN200810218651A CN101412026B CN 101412026 B CN101412026 B CN 101412026B CN 2008102186512 A CN2008102186512 A CN 2008102186512A CN 200810218651 A CN200810218651 A CN 200810218651A CN 101412026 B CN101412026 B CN 101412026B
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Abstract
The invention discloses a method for sorting white light LED. The white light LED is formed by coating phosphor powder outside a blue light LED chip. The sorting method comprises the following steps: (1) the white light LEDs with same levels of voltage difference and brightness are sorted out; (2) different light split blocks on a chromatic diagram is defined, wherein the light split blocks consist of two curves parallel to a black track and two isotemperature lines with color temperature difference, and each block corresponds to one type of the LEDs; and (3) XY values of the LEDs on the chromatic diagram are measured, the corresponding light split blocks on the chromatic diagram according to the measured XY values are found out, coordinate values corresponding to four vertexes of all blocks within a block range are found out, the coordinate values into a full-automatic light split machine are inputted, and the LEDs by the fully-automatic light split machine are measured and sorted. The method is the most economic and convenient method for sorting light when the requirements can be met.
Description
Technical field
The present invention relates to the LED lighting field, especially to dividing the method for white light LEDs photoelectric property individual difference.
Background technology
At present; Because the luminous efficiency and the brightness of white light LEDs are increasingly high now; And advantage such as have power saving, environmental protection, volume is little, excitation is high, firm and life-span is long, so the white light LEDs conventional light source such as fluorescent tube that progressively replacing mercurous one-tenth are applied to throwing light on, the backlight of liquid crystal, FPD, car light etc.
White light LEDs exists individual difference clearly in nature in electricity, optics and colorimetry.There are a lot of aspects in these difference sources:
1. the manufacture process that comes from chip:
1) epitaxial growth is inconsistent, and its external attribute shows mainly that peak value (master) wavelength is inconsistent, the inconsistency of forward voltage, spectral bandwidth are inconsistent.
2) inconsistency that causes of chip manufacturing proces, the inconsistency of its present forward voltage of external attribute list.
3) the chip cutting geometry is inconsistent, and the luminosity that causes is inconsistent.
2. from encapsulation process:
1) what difference of fluorescent material proportioning and fluorescent glue causes the inconsistent of photochromism space.
2) inconsistency of lens (Lens) character causes photochromic space inconsistency.
3) inconsistency of the optical property of outer sealing causes photochromic space inconsistency.
4) inconsistency of heat dissipation channel causes different junction temperatures to cause the different drift of LED luminescent spectrum.
3. from the difference of use side: mainly show the residing status inconsistency of each LED lamp in the drive circuit.Owing to the existence of these differences, must find the method for a this nature difference of suitable differentiation.
Illumination and backlight are all very high to the coherence request of the colour rendering of light source, luminosity, light source.Therefore; For satisfying the requirement of illumination and backlight to LED; The LED that will individual difference be arranged by epitaxial growth, chip manufacturing, encapsulation process is under the situation that satisfies customer requirement, industry standard, distinguish with most economical, easy-operating mode; To reach the purpose of control LED aberration, obtain best method for separating.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method for sorting white light LED; Under the situation that satisfies customer requirement, industry standard; Mode with the operation of economical and convenient distinguishes white light LEDs, makes with block white light LEDs aberration below slight, promptly outside people's sensation.
For solving the problems of the technologies described above, the technical scheme that the present invention is is: a kind of method for sorting white light LED, and said white light LEDs is made up of blue-light LED chip outside coating fluorescent powder, and said method for sorting white light LED has following steps:
Phase I:
A. confirm voltage and voltage separation voltage difference grade, according to the corresponding grade of each fixing voltage difference white light LEDs is carried out sorting, fixing voltage difference is any voltage difference among 0.10～0.41v;
B. confirm minimum brightness and brightness sorting multiple grade, according to each fixedly grade of multiple correspondence white LED lamp is carried out sorting, fixedly the numerical value of multiple is any numerical value in 1.19～1.51;
C. be defined in beam split blocks different on the chromatic diagram, said beam split block is to have two isotemperature lines formation blocks that aberration is parallel to two curves of black body locus and has color temperature difference; The LED of the corresponding type of each block; Said aberration is got arbitrary value in 0.0025uv～0.0075uv scope, aberration refers to the aberration between minimum 2 of aberration on two curves that are parallel to black body locus; The scope of said color temperature difference value is: when colour temperature is lower than 12000K, and the arbitrary value of grade classification span between 100K～1000K; When colour temperature was higher than 12000K, the grade classification scope was the arbitrary value between 1500K～5000K;
The numerical value of D. that four summits of all blocks in the block scope are corresponding coordinate figure, rated voltage and voltage separation voltage difference, minimum brightness and brightness sorting multiple grade is imported in the full-automatic light splitting machine;
Steps A, B, C be order in no particular order;
Second stage:
E. white light LEDs is put into full-automatic light splitting machine and carry out sorting.
As improvement, described second stage, white light LEDs is put into the step that full-automatic light splitting machine carries out sorting and is comprised:
F. logical forward constant current is measured the suffered forward voltage of LED, and compares with rated voltage, the white light LEDs of voltage difference in the same setting range rank that is sorted out;
G. measure brightness, and compare, in the white light of the same bright multiple scope rank that is sorted out with minimum brightness;
H. measure X, Y value on the chromatic diagram of white light LEDs, the coordinate figure corresponding according to four summits of beam split block is sorted into different classes to LED;
Step e, G, H are regardless of order backward.
As improvement, the fixed voltage difference is 0.20v; Brightness fixedly multiple value is 1.30; Value of chromatism is 0.0055uv; The colour temperature difference is: when colour temperature was lower than 12000K, the grade classification difference was 500K; When colour temperature was higher than 12000K, the grade classification difference was 3000K.
Voltage difference, brightness multiple value, value of chromatism and the colour temperature difference of stating with the present invention be as the division foundation of beam split block scope, can make the aberration scope of LED of beam split block at 0～1.5NBS, and aberration is outside people's sensation.
The beneficial effect that the present invention is compared with prior art brought is:
The aberration that block laterally is parallel between two curves of black body locus exists: between 0.0025uv～0.0075uv; The color temperature difference of the vertical two colour temperature lines of block exists: when colour temperature was lower than 12000K, color temperature difference was between 100K～1000K; When colour temperature was higher than 12000K, color temperature difference was between 1500K～5000K; Fixing voltage difference is the arbitrary voltage difference among 0.10～0.41v; The brightness fixedly numerical value of multiple is the arbitrary numerical value in 1.19～1.51.The aberration that marks off the white light LEDs in the beam split block that comes in this voltage difference, brightness multiple value, value of chromatism and colour temperature difference is slight, outside people's sensation, and is the light-splitting method of most economical, the operation most convenient under the situation about meeting the demands.The block counts that has guaranteed the branch under the no color differnece situation is the least possible, enhances competitiveness.
Description of drawings
Fig. 1 is the division of beam split block on chromatic diagram.
The specific embodiment
Below in conjunction with Figure of description the present invention is described further.
Because white light LEDs itself is a current device, it is along with the performance variation of change in voltage is very big.Therefore the big young pathbreaker of its forward voltage is having a strong impact on the optical property of white light LEDs.Therefore, forward voltage is an important sorting parameter.
As shown in Figure 1, from chrominance space, in chrominance space, implying another parameter, that is exactly brightness, just representes brightness at the Z of chrominance space axle, and what represent on the XY plane is same brightness.So brightness is another very important sorting parameter.
According to colorimetry, even color figure, energy emission theory; On chromatic diagram, define different beam split blocks 2; Two isotemperature lines, the 3 formation blocks 2 that said beam split block 2 is parallel to two curves of black body locus 1 and has color temperature difference for having aberration, the LED of each block 2 corresponding type.Be parallel to the aberration between minimum 2 of aberration on two curves of black body locus 1: 0.0025uv～0.0075uv in the said beam split block 2; Color temperature difference in the said beam split block 2 between two isotemperature lines 3 is: when colour temperature was lower than 12000K, color temperature difference was between 100K～1000K; When colour temperature was higher than 12000K, color temperature difference was between 1500K～5000K.
As shown in Figure 1; XY value on the chromatic diagram of mensuration LED finds corresponding beam split block 2 according to the XY value of being surveyed on chromatic diagram, find the corresponding coordinate figure in 2 four summits of all blocks in block 2 scopes; Import in the full-automatic light splitting machine; Full-automatic light splitting machine is measured sorting to LED, LED is assigned as dissimilar, and white light LEDs will be sorted out.
Embodiment 1
As shown in Figure 1; When carrying out the sorting of LED white light; On the light splitting machine respectively the input voltage difference be value of chromatism 0.0025uv and the reference color temperature 2600K～2700K between minimum 2 of aberration on 0.10v, brightness multiple value 1.19, two curves, produce beam split B block (as shown in Figure 1) and this block respective coordinates form TB through above-mentioned value of chromatism and reference color temperature value:
Find the corresponding coordinate figure in four summits of all blocks in the B block scope, import in the full-automatic light splitting machine, full-automatic light splitting machine is measured sorting to LED, LED is assigned as dissimilar, and white light LEDs will be sorted out in all B blocks.
Embodiment 2
As shown in Figure 1; When carrying out the sorting of LED white light; On the light splitting machine respectively the input voltage difference be value of chromatism 0.0035uv and the reference color temperature 6500K～7000K between minimum 2 of aberration on 0.20v, brightness multiple value 1.20, two curves, produce beam split T block (as shown in Figure 1) and this block respective coordinates form TT through above-mentioned value of chromatism and reference color temperature value:
Find the corresponding coordinate figure in four summits of all blocks in the T block scope, import in the full-automatic light splitting machine, full-automatic light splitting machine is measured sorting to LED, LED is assigned as dissimilar, and white light LEDs will be sorted out in all T blocks.
Embodiment 3
As shown in Figure 1; When carrying out the sorting of LED white light; On the light splitting machine respectively the input voltage difference be value of chromatism 0.0055uv and the reference color temperature 9000K～1000K between minimum 2 of aberration on 0.30v, brightness multiple value 1.30, two curves, produce beam split X block (as shown in Figure 1) and this block respective coordinates form TX through above-mentioned value of chromatism and reference color temperature value:
Find the corresponding coordinate figure in four summits of all blocks in the X block scope, import in the full-automatic light splitting machine, full-automatic light splitting machine is measured sorting to LED, LED is assigned as dissimilar, and white light LEDs will be sorted out in all X blocks.
Embodiment 4
As shown in Figure 1; When carrying out the sorting of LED white light; On the light splitting machine respectively the input voltage difference be value of chromatism 0.0065uv and the reference color temperature 12000K～135000K between minimum 2 of aberration on 0.35v, brightness multiple value 1.40, two curves, produce beam split a block (as shown in Figure 1) and this block respective coordinates form Ta through above-mentioned value of chromatism and reference color temperature value:
Find the corresponding coordinate figure in four summits of all blocks in a block scope, import in the full-automatic light splitting machine, full-automatic light splitting machine is measured sorting to LED, LED is assigned as dissimilar, and white light LEDs will be sorted out in all a blocks.
Embodiment 5
When carrying out the sorting of LED white light; On the light splitting machine respectively the input voltage difference be value of chromatism 0.0075uv and the reference color temperature 20000K～25000K between minimum 2 of aberration on 0.41v, brightness multiple value 1.51, two curves, produce beam split d block (as shown in Figure 1) and this block respective coordinates form Td through above-mentioned value of chromatism and reference color temperature value:
Find the corresponding coordinate figure in four summits of all blocks in the d block scope, import in the full-automatic light splitting machine, full-automatic light splitting machine is measured sorting to LED, LED is assigned as dissimilar, and white light LEDs will be sorted out in all d blocks.
Voltage difference according to fixing is the arbitrary voltage difference among 0.10～0.41v; The numerical value of constant brightness multiple is the arbitrary numerical value in 1.19～1.51; Aberration is arbitrary value in 0.0025uv～0.0075uv scope; And the scope of color temperature difference value is: when colour temperature is lower than 12000K, and the arbitrary value of grade classification span between 100K～1000K; When colour temperature is higher than 12000K; The grade classification scope is the arbitrary value between 1500K～5000K; In light splitting machine, import different voltages with different difference, brightness multiple value, and find pairing block 2 in the chromatic diagram scope, with the corresponding coordinate figure in 2 four summits of all blocks according to value of chromatism and colour temperature difference; Import in the full-automatic light splitting machine; Will be sorted into corresponding with it material pipe at the LED of same colourity block 2, with its colourity block 2 corresponding names of the white light LEDs called after in the same material pipe, the white light LEDs to same name carries out unitizing, warehouse-in, shipment then.
By block 2 grade classification of the present invention, the aberration of the white light LEDs that sorts out is slight, outside people's sensation, and is the light-splitting method of most economical, the operation most convenient under the situation about meeting the demands.The block counts that has guaranteed the branch under the no color differnece situation is the least possible, enhances competitiveness.
Claims (3)
1. method for sorting white light LED, said white light LEDs is made up of blue-light LED chip outside coating fluorescent powder, and it is characterized in that: said method for sorting white light LED step comprises:
Phase I:
A, confirm rated voltage and voltage separation voltage difference grade, according to the corresponding grade of each fixing voltage difference white light LEDs is carried out sorting, fixing voltage difference is any voltage difference among the 0.10-0.41v;
B, confirm minimum brightness and brightness sorting multiple grade, according to each fixedly the corresponding grade of multiple white LED lamp is carried out sorting, fixedly the numerical value of multiple is any numerical value in 1.19 one 1.51;
C, be defined in beam split blocks different on the chromatic diagram, said beam split block is to have two curves that aberration is parallel to black body locus to form blocks with two isotemperature lines with color temperature difference; The LED of the corresponding type of each block;
Said aberration is got arbitrary value in 0.0025uv～0.0075uv scope, aberration refers to the aberration between minimum 2 of aberration on two curves that are parallel to black body locus;
The scope of said color temperature difference value is: when colour temperature is lower than 12000K, and the arbitrary value of grade classification span between 100K～1000K; When colour temperature was higher than 12000K, the grade classification scope was the arbitrary value between 1500K～5000K;
The numerical value of D, coordinate figure, rated voltage and voltage separation voltage difference, minimum brightness and brightness sorting multiple grade that four summits of all blocks in the block scope are corresponding is imported in the full-automatic light splitting machine;
Steps A, B, C be order in no particular order;
Second stage:
E, white light LEDs is put into full-automatic light splitting machine carry out sorting.
2. method for sorting white light LED as claimed in claim 1 is characterized in that: described second stage, white light LEDs are put into the step that full-automatic light splitting machine carries out sorting and are comprised:
F, logical forward constant current are measured the suffered forward voltage of LED, and compare with rated voltage, the white light LEDs of voltage difference in the same setting range rank that is sorted out;
G, measure brightness, and compare, in the white light of the same bright multiple scope rank that is sorted out with minimum brightness;
X, Y value on the chromatic diagram of H, mensuration white light LEDs, the coordinate figure corresponding according to four summits of beam split block is sorted into different classes to LED;
Step F, G, H be order in no particular order.
3. method for sorting white light LED as claimed in claim 1 is characterized in that: the fixed voltage difference is 0.2v; Brightness fixedly multiple value is 1.3; Value of chromatism is 0.005uv; The colour temperature difference is: when colour temperature was lower than 12000K, the grade classification difference was 500K; When colour temperature was higher than 12000K, the grade classification difference was 3000K.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103846230B (en) * | 2012-11-30 | 2016-04-20 | 湘能华磊光电股份有限公司 | A kind of method for separating of LED chip |
| CN104550046B (en) * | 2013-10-16 | 2017-01-04 | 北大方正集团有限公司 | Point stack device of circuit board and point heaping method of circuit board |
| CN105042365A (en) * | 2015-07-08 | 2015-11-11 | 复旦大学 | White light LED illuminating system with high light color quality and designing method thereof |
| CN106423915B (en) * | 2016-10-12 | 2018-11-23 | 合肥彩虹蓝光科技有限公司 | A kind of method of testing, sorting color separation |
| CN108057644B (en) * | 2017-12-28 | 2019-12-03 | 鸿利智汇集团股份有限公司 | A kind of LED light-splitting method |
| CN113828547B (en) * | 2021-10-08 | 2023-02-24 | 北京水木东方医用机器人技术创新中心有限公司 | Coaxial light source precision screening system and method |
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| DE10224220A1 (en) * | 2002-05-31 | 2003-12-18 | Osram Opto Semiconductors Gmbh | Forming groups of light-emitting diodes with similar properties, measures their brightness and dominant wavelength of emission at constant voltage before sorting |
| CN1197174C (en) * | 2000-03-27 | 2005-04-13 | 通用电气公司 | White lumination system with improved color output |
| CN100566484C (en) * | 2005-04-14 | 2009-12-02 | 皇家飞利浦电子股份有限公司 | The color control of white led lamps |
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| CN1197174C (en) * | 2000-03-27 | 2005-04-13 | 通用电气公司 | White lumination system with improved color output |
| DE10224220A1 (en) * | 2002-05-31 | 2003-12-18 | Osram Opto Semiconductors Gmbh | Forming groups of light-emitting diodes with similar properties, measures their brightness and dominant wavelength of emission at constant voltage before sorting |
| CN100566484C (en) * | 2005-04-14 | 2009-12-02 | 皇家飞利浦电子股份有限公司 | The color control of white led lamps |
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Address after: 510890 Huadu District, Guangdong, Guangzhou Flower Town, SAST Road, No. 1, No. 1 Patentee after: Hongli Newell group Limited by Share Ltd Address before: 510800 Dongfeng Road West, automobile city, Huadu District, Guangdong, Guangzhou Patentee before: Guangzhou Hongli Tronic Co., Ltd. |