TWI461661B - Method for sorting a light source - Google Patents

Description

Light source screening method

The invention relates to a screening method, in particular to a light source screening method.

General light source analysis often uses the CIE (Commission International de l'Eclairage) 1931 coordinates (hereinafter referred to as CIE coordinates) to define the color of the light source. The CIE coordinates are usually expressed in the form of (x, y), and each specific coordinate (a, b) corresponds to a specific color, and the coordinates (a + △ x, b + Δy) adjacent to the coordinates (a, b) are presented. The color is similar to the color represented by the coordinates (a, b). For example, the pure white CIE coordinates are (0.33, 0.33), so the coordinates of the coordinates adjacent to the CIE coordinates (0.33, 0.33) will be close to pure white.

In addition, the color corresponding to each specific CIE coordinate (a, b) may be mixed by light of different wavelengths, that is, the light sources with different spectral compositions may also exhibit the same (or similar) colors and correspond to the same (or similar). The CIE coordinate, which is the metamerism characteristic of the CIE coordinate. Therefore, if the CHEN coordinates are used to analyze different light sources, when the light sources emit the same (or similar) color light and have the same (or similar) CIE coordinates, it is impossible to judge whether the spectral characteristics of the light sources are similar from the analysis results.

For example, a white LED package light source can be matched with an appropriate phosphor powder by an LED die (for example, a blue LED die with a yellow phosphor) Mixed light. Two blue LED dies with the same illuminating color are respectively matched with yellow luminescent powder with different composition and ratio, which can form a white LED package light source with the same (or similar) illuminating color, but the spectral characteristics of the white LED package light source It will vary depending on the phosphor used. Therefore, although the color of the white LED package light source can be analyzed and defined by using a general CIE coordinate, the spectral characteristics of the white LED package cannot be analyzed from the CIE coordinates, and it is impossible to know whether the white LED packages are the same. The composition of the grains or phosphor powder. That is to say, only the CIE coordinate analysis method is used to analyze and screen different light sources, and there are still application limitations.

Accordingly, it is an object of the present invention to provide a screening method capable of identifying and screening a plurality of light sources of the same type (the same color of illumination and similar spectral characteristics) among a plurality of light sources.

Therefore, the light source screening method of the present invention comprises the following steps: (A) receiving a measurement data of a measured light source, the measurement data comprising a plurality of wavelength information and a plurality of light intensity information respectively corresponding to the information of the equal wavelength; (B) converting the measurement data to determine whether the CIE coordinate of the light source under test falls within a predetermined interval that is the same as a reference light source, and if the determination result is "Yes", performing step (C); (C) The plurality of wavelength information and the plurality of light intensity information are used to represent a spectral curve of the measured light source, and the light intensity information in the spectral curve of the measured light source is respectively converted into a plurality of corresponding light intensity change amount information, Presenting a converted spectral curve of the measured light source corresponding to the light intensity change amount information by the wavelength information; (D) The number of inflection points of the spectral curve and the wavelength corresponding to each inflection point are analyzed according to the converted spectral curve; (E) determining whether the number of inflection points of the respective spectral curves of the measured light source and the reference light source are the same, and if the result is determined If yes, perform step (F); and (F) determine whether the wavelength difference of the inflection point corresponding to the spectral curve of the reference light source and the reference light source is within a predetermined corresponding wavelength difference range, If the determination result is "Yes", it is determined that the measured light source and the reference light source are the same type of light source of the same color.

Preferably, the step (B) further comprises the following steps: converting the measurement data into the CIE1931 coordinate by using a calculation method in CIE15-2004 to determine whether the measured light source falls in the same schedule as the reference light source. Within the interval.

Preferably, if the determination result in the step (B) is "NO", it is determined that the light source to be measured and the reference light source are different color light sources.

Preferably, if the determination result in the step (E) is "NO", it is determined that the light source to be measured and the reference light source are light sources of the same color.

Preferably, if the determination result in the step (F) is "NO", it is determined that the light source to be measured and the reference light source are light sources of the same color.

Preferably, in the step (D), the converted spectral curve has a plurality of peak points and a plurality of valley points, each of the peak points corresponding to a peak wavelength, wherein the valley points each correspond to a valley wavelength, wherein all The peak wavelength or valley wavelength is the wavelength of the inflection point of the measured light source.

Further, the present invention further provides a light source screening method, the method comprising: determining, by a CIE coordinate, whether a CIE coordinate of a measured light source falls within a predetermined interval of a reference light source to determine Whether the measured light source and the reference light source have the same or similar illuminating color and analyzes the measured light source through a spectral curve to determine whether the measured light source and the reference light source have the same or similar spectral curves.

Preferably, the spectral graph analysis further comprises a converting step of respectively converting the spectral curve of the measured light source and the reference light source into a converted spectral curve, by using the converted spectral curve of the measured light source and the reference light source. The bending difference of the spectral curve is analyzed.

Preferably, the light source screening method further comprises a calculating step of analyzing the bending difference of the spectral curve by calculating the number of inflection points of each of the spectral curves and the wavelength difference corresponding to each of the inflection points.

The effect of the invention is that the spectral curve conversion method is used to analyze and compare the characteristics of the corresponding light source and the corresponding inflection point of the reference light source, and it can be determined that the two are heterochromatic, homochromatic or homogeneous light sources of the same color.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

1 is a preferred embodiment of the light source screening method of the present invention. In this embodiment, the light source screening method is applied to the analysis and screening of the LED package, but not limited thereto, the method can also be applied to other methods. On the type of illumination source or lighting fixture, the specific implementation steps are described in the following paragraphs in conjunction with the relevant drawings.

In this embodiment, a spectral analysis instrument is used to measure the optical characteristics of an LED package to obtain a measurement data (such as Table 1), and the measurement data is Stored in a computer for subsequent analysis and screening steps. The foregoing spectral analysis instrument is measured using an integrating sphere and an LED optical & electric tester, but is not limited thereto.

Referring to Table 1, the measurement data corresponding to one LED package (only the partial data is represented), the measurement data includes a plurality of wavelength information and a plurality of respectively located in a specific wavelength interval. Intensity information corresponding to wavelength information. Among them, the light intensity information has been normalized to facilitate comparative analysis between multiple measured data, but the light intensity information can also be analyzed using its original data without formalization. Limited to the content disclosed herein.

When detecting the LED package, the wavelength range of the spectrum analyzer is set to 380 nm to 780 nm through the computer, and a light intensity information is taken every other specific wavelength interval (Δλ), for example, 1 nm. It should be noted, however, that the wavelength interval and the wavelength spacing can be flexibly set as needed, and are not limited to the contents disclosed herein.

According to the above-mentioned wavelength information and the light intensity information, the computer can use the calculation method in CIE15-2004 to convert the measurement data into a corresponding CIE 1931 coordinate value, so as to display the measurement data in a CIE. On the graph (Figure 2). Here, only CIE1931 is taken as an example, but not limited thereto. As described above, since the LED dies having the same illuminating color are combined with the phosphors of different compositions and ratios, the LED package light sources of the same (or similar) color can be mixed, but the spectral characteristics of the respective light sources will follow the use of the fluorescing color. The light powders are different and different. Therefore, in addition to analyzing the light source by the CIE coordinates, the present invention also analyzes the spectral curve map to determine whether the plurality of LED package light sources belong to the same type of light source of the same color. Furthermore, when the present invention analyzes the light source under test by the CIE coordinate, it can be determined that the light source to be tested and the reference light source are light sources having the same or similar illuminating colors, or are different color light sources (light sources having significantly different illuminating colors). The invention can determine the measured light source and the reference after analyzing the measured light source by the spectral curve. The light source has the same or similar spectral curve for both, or there is a significant difference between the spectral curves of the two.

Subsequent paragraphs will be represented by two different LED package light sources to illustrate the specific implementation steps of the light source screening method of the present invention. The LED package body light source uses blue LED dies with similar illuminating colors and spectral characteristics, and respectively emits white luminescent powder with different yellow luminescent powders. The components of the yellow phosphors are F540+BR102C+BR102D (both are the constituents of the phosphor powder) and GAL540+BR102C+BR102D (all of which are the constituents of the phosphor powder). For the convenience of description, the LED package light source using F540+BR102C+BR102D phosphor powder is classified into the first light source type in the following paragraphs, and the LED package light source using GAL540+BR102C+BR102D phosphor powder is classified as the second light source. Type, in order to distinguish the type of light source of the above two LED packages.

2 is a CIE coordinate diagram of an LED package of a plurality of first light source types (represented by black triangles) and a plurality of second light source types (represented by gray circles). Wherein, the trapezoidal regions defined by coordinate points A (0.4433, 0.4003), coordinate points B (0.4583, 0.4024), coordinate points C (0.4703, 0.4230), and coordinate points D (0.4542, 0.4210) are the first light source types. The predetermined interval of the LED package, that is, the CIE coordinates of the LED packages of the first light source type, falls within this predetermined interval. However, it can be observed from FIG. 2 that the CIE coordinates of the LED packages of the second light source type also fall within the predetermined interval, that is, the LED packages of the first and second light source types have similar illumination colors. Thus having approximate CIE coordinate values and distributed from the CIE coordinates It can be seen that the naked eye can hardly distinguish the color difference of each LED package, so the LED packages can be classified as light sources of similar illuminating colors. Therefore, in order to distinguish the phosphor components used in these LED packages, further spectral graph analysis must be performed.

Hereinafter, the steps of performing the LED package for distinguishing the same type of different types of light sources in the embodiment will be described in detail with reference to FIGS. 1 to 4:

Step S1: The computer receives the measurement data of a measured light source.

The measured data of the measured light source includes a plurality of wavelength information and a plurality of light intensity information (see Table 1). Here, the measured light source belongs to the second light source type. Subsequent paragraphs will compare and analyze the measured data of the measured light source with a reference light source measurement data pre-stored by the computer. The reference light source belongs to the first light source type, and the measurement data is shown in Table 2.

Step S2: The computer converts the measurement data to determine whether the CIE coordinate of the measured light source is within a predetermined interval of one of the reference light sources.

The computer calculates the CIE coordinate of the measured light source according to the measured data of the measured light source, and further determines whether the CIE coordinate of the measured light source falls within a predetermined interval of the CIE coordinate of the reference light source to determine the Whether the illuminating color of the measured light source is the same (or similar) as the reference light source. If the CIE coordinate of the light source under test falls within a predetermined interval of the reference light source (as shown in FIG. 2), indicating that the light source under test and the reference light source are light sources having the same or similar illuminating colors, then step S3 is continued. On the other hand, if the CIE coordinate of the light source under test does not fall within the predetermined interval, it is determined that R1: the light source to be measured and the reference light source are different color light sources.

It should be noted that the predetermined interval of the CIE coordinates of the reference light source can be flexibly adjusted as needed, and is not limited to the content disclosed in the embodiment.

Step S3: The computer presents a spectral curve and a converted spectral curve according to the measured data.

3 is a spectral graph drawn according to the measured data of the measured light source and the reference light source (Table 1 and Table 2), wherein the horizontal axis represents wavelength information in nm (nano); the vertical axis is normalized. Light intensity information, the unit of marking is not set. Where the solid curve corresponds to the first light source type The reference light source, the dashed curve corresponds to the measured light source of the second light source type.

Referring to FIG. 3, the measured light source and the reference light source have similar illuminating color and spectral distribution trends, but the two spectral curves exhibit large differences in bending characteristics. Specifically, the spectral curves have a relatively small peak at 450 nm adjacent wavelengths and a relatively large peak at 610 nm adjacent wavelengths. On the other hand, the spectral curves have large bending differences at wavelengths from 450 to 580 nm. The analysis of the bending characteristics of the spectral curve can be performed by the inflection point. Therefore, the present invention further analyzes the inflection points of the spectral curves to distinguish the bending differences of the two spectral curves, and thereby distinguishes the light source type of the measured light source from the reference light source.

As far as the definition of mathematics is concerned, the inflection point is the conversion coordinate point where the curve is converted from a concave upward to a downward downward curve or the curve is converted from a downward bend to an upward bend, so the above content is also It can be understood as: "The inflection point is the conversion coordinate point of the bending property of the curve". Here, "upwardly bent" means that the slope of the curve gradually increases in a wavelength range, and "downwardly bent" means that the slope of the curve gradually decreases in a wavelength range. Therefore, the inflection point can be interpreted as: "The inflection point is the slope of the curve that changes from increasing to decreasing, or its slope is converted from decreasing to an increasing transition point coordinate."

Based on the above, the slope of the spectral curves in Figure 3 can be defined as:

Where m represents a specific spectrum within the spectral curve of the measured or reference source The slope of the fixed point, I represents the light intensity of a specific point in the spectral curve of the measured light source or the reference light source, and ΔI represents the amount of light intensity change at a specific point in the spectral curve of the measured light source or the reference light source ( Intensity variation); λ represents the wavelength of a specific point in the spectral curve of the measured or reference source, and Δλ represents the wavelength variation of a specific point in the spectral curve of the measured source or reference source. Subsequent paragraphs will represent I(λ) as a function of light intensity I versus wavelength λ (i.e., the measured light source and the spectral curve function of the reference source) for correlation analysis.

According to the foregoing description, the measured data of the measured light source and the reference light source obtain corresponding light intensity information at a fixed wavelength interval, that is, the wavelength change amount Δλ of the spectral curves can be regarded as a constant. Therefore, the slope m of the spectral curve of the measured light source and the reference light source is proportional to the light intensity change amount ΔI:

That is to say, "the inflection point is the characteristic that the slope m of the spectral curve is converted from increasing to decreasing, or the slope m is converted from decreasing to an increasing transition point coordinate", which can be understood as "the inflection point is The light intensity variation ΔI of the isospectral curve is converted from increasing to decreasing, or the light intensity variation ΔI is converted from decreasing to an increasing transition point coordinate. Therefore, by analyzing the light intensity change amount ΔI of the spectral curves, the coordinates of the inflection points of the spectral curves can be known.

Referring to FIG. 4, a graph of the converted spectrum presented by the spectral graph of FIG. 3 after data conversion is shown. The variation of the light intensity variation ΔI of the corresponding spectral curve in Fig. 3 can be known from the converted spectral curves in Fig. 4. The trend can be used to know the inflection point of the spectral curves, and further analyze the bending difference of the spectral curve of the measured light source and the reference light source. Among them, the vertical axis of the conversion spectrum curve of FIG. 4 shows the light intensity change amount ΔI information, no specific unit; the horizontal axis is the wavelength, and the unit is nanometer (nm).

The following describes the method of the present invention for converting the spectral curves of FIG. 3 into the converted spectral curves corresponding to FIG. If ΔI(λ) (conversion spectral curve function) is used to represent the change in the light intensity variation ΔI versus the wavelength λ, the relationship between the converted spectral curve function ΔI(λ) and the spectral curve function I(λ) is as follows: △I(λ)=I(λ)-I(λ-△λ)

The conversion spectral curve function ΔI(λ) is a light intensity variation ΔI corresponding to a specific wavelength, and the spectral curve function I(λ) is a light intensity I corresponding to a specific wavelength λ.

Referring to Table 1, taking the measured light source as an example: the measured light source takes a light intensity information every 1 nm, so the wavelength spacing Δλ is 1 nm. In addition, the light intensity of the measured light source at a wavelength of 440 nm is 0.20988, so I(440)=0.20988. Furthermore, the light intensity of the measured light source at a wavelength of 439 nm is 0.18967, so I(439)=0.18967. Based on the above, it can be known that the light intensity variation ΔI(440) of the measured light source corresponding to the wavelength of 440 nm is: ΔI(440)=I(440)-I(440-1)=I(440)-I (439)=0.20988-0.18967=0.02021

In this way, the light intensity information I of the measured light source in Table 1 can be A data as shown in Table 3 is obtained by converting to the corresponding light intensity change amount information ΔI. In addition, the measurement data of the reference light source in Table 2 can also be converted into the data as shown in Table 4 by the same calculation method. Then, the information on the light intensity change and the wavelength information of the measured and reference light sources in Tables 2 and 4 are presented on the spectral graph, which are the converted spectral curves of FIG.

In addition, the converted spectral curve functions can also be converted by the following formulas with the same effect: ΔI(λ)=I(λ+Δλ)-I(λ)

Step S4: The computer analyzes the number of inflection points of the spectral curve and the wavelength corresponding to each inflection point according to the converted spectral curve.

According to the correspondence relationship of the foregoing conversion formula, the spectral curves and the converted spectral curves presented in step S3 have the following characteristics: the inflection point wavelengths of the spectral curves in FIG. 3 correspond to the changes in the light intensity of the converted spectral curves in FIG. 4, respectively. The amount ΔI is converted from a gradual increase to a wavelength of a decreasing peak point, or a light intensity change amount ΔI corresponding to the converted spectral curve is converted from a decreasing value to a wavelength of an increasing valley point.

Referring to FIG. 5, the upper half corresponds to FIG. 3, and the lower half corresponds to FIG. 4, which is used to explain the inflection point of the spectral curve and the peak value (or relative maximum value) and the valley point of the converted spectral curve. Correspondence between (valley value, or relative minimum). As indicated by the reference line L1, the wavelength of the first peak point of the converted spectral curve ΔI(λ) corresponds to the wavelength of the first inflection point of the spectral curve I(λ). Similarly, as indicated by reference line L2, the wavelength of the first valley point of the converted spectral curve ΔI(λ) corresponds to the wavelength of the second inflection point of the spectral curve I(λ). That is, the wavelengths of the peak points and the valley points of the converted spectral curves correspond to the wavelengths of the respective inflection points of the spectral curves, respectively. Although the computer cannot directly know the inflection point coordinates of the spectral curve from the measured data of the measured light source and the reference light source, the computer can analyze the wavelength of the peak and valley points of the converted spectral curve. The inflection points of the spectral curves are indirectly obtained to further compare the bending differences of the spectral curves to determine whether the two light sources belong to the same type, and the detailed analysis contents are as follows.

Referring to FIG. 3, FIG. 4 and Table 5, according to the above analysis manner, the first, second and third peak point coordinate points of the converted spectral curve of the measured light source in FIG. 4 are respectively (440, 0.02022), (516, 0.01121), (580, 0.00827), the corresponding wavelengths are 440 nm, 516 nm, 580 nm, which is referred to herein as the first peak wavelength ( ), the second peak wavelength ( ) with the third peak wavelength ( ).

According to the characteristics of the foregoing converted spectral curve, the wavelengths of the first, third, and fifth inflection points of the spectral curve of the measured light source in FIG. 3 are 440 nm, 516 nm, and 580 nm, respectively, and the coordinate points are respectively (440 , 0.20988), (516, 0.32777), (580, 0.84316).

In addition, the first, second, and third valley point coordinates of the converted spectral curve of the measured light source in FIG. 4 are (460, -0.01269), (556, 0.00628), (651, -0.01198), respectively. The corresponding wavelengths are 460 nm, 556 nm, and 651 nm, which are referred to herein as the first valley wavelength ( ), the second valley wavelength ( ) with the third valley wavelength ( ).

Also according to the characteristics of the aforementioned converted spectral curve, the wavelengths of the second, fourth, and sixth inflection points of the spectral curve of the measured light source in FIG. 3 are sequentially The coordinates are 460 nm, 556 nm, and 651 nm, and their coordinates are (460, 0.25405), (556, 0.66977), (651, 0.67904).

Similarly, referring to FIG. 3, FIG. 4 and Table 6, the first, second and third peak point coordinate points of the converted spectral curve of the reference light source are (441, 0.02074), (499, 0.00658), (563, 0.00915). ), the corresponding first, second, and third peak wavelengths are 441 nm, 499 nm, and 563 nm, and respectively correspond to the first inflection point of the spectral curve of the reference light source in FIG. 3 (441, 0.24147), The wavelength of the three inflection points (499, 0.25370) and the fifth inflection point (563, 0.70997).

The first, second, and third valley point coordinates of the converted spectral curve of the reference light source in FIG. 4 are (460, -0.01321), (517, 0.00560), (647, -0.01169), the first, The second and third valley wavelengths are 460 nm, 517 nm, and 647 nm, and correspond to the second, fourth, and sixth inflection points of the spectral curve of the reference light source in FIG. 3 (460, 0.29651), (517, respectively. , 0.36289), (647, 0.69085).

According to the above analysis result, the spectral curve of the measured light source in FIG. 3 has six inflection points, and the wavelengths of the inflection points are 440 nm, 460 nm, 516 nm, 556 nm, 580 nm, and 651 nm.

In Fig. 3, the spectral curve of the reference light source also has six inflection points, and the wavelengths corresponding to the respective inflection points are 441 nm, 460 nm, 499 nm, 517 nm, 563 nm and 647 nm.

So far, the computer has obtained the analysis of the step S4 by finding the number of inflection points of the reference light source and the reference light source and the wavelength corresponding to each of the inflection points.

Step S5: The computer determines the spectrum of the measured light source and the reference light source Whether the number of inflection points of the curve is the same.

If the result of the above determination is "YES", the process proceeds to step S6. If the result of the determination is "NO", it is determined that R2: the light source to be measured and the reference light source are of the same type of light source of the same color. The above-mentioned "homogeneous type of light source" means that the light source to be measured is close to or within the same predetermined interval as the CIE coordinate of the reference light source, but the spectral curve has a large difference and is classified into different types of light sources. According to the analysis result of step S4, the measured light source and the reference light source have the same number of inflection points (6), so step S6 must be continued.

Step S6: The computer determines whether the wavelength difference corresponding to the inflection point of the spectral curve of the measured light source and the reference light source is within a predetermined range.

If the result of the determination is "Yes", the determination result is R3: the light source to be measured and the reference light source are light sources of the same color of the same color. If the result of the determination is "NO", the determination result is R2: the measured light source and the reference light source are different colors of the same type. Wherein, the "same-color light source of the same type" means that the measured light source is close to or within a predetermined interval of the CIE coordinates of the reference light source, and the spectral curves of the two are the same (or similar), and thus are regarded as the same type of light source.

Refer to Table 7 for the data table analyzed by the computer for the measured light source and the reference light source in step S4, and the determination result of step S6 is performed. Where the wavelength difference of inflection points, ) is the absolute value of the wavelength difference between the reference source and the corresponding inflection point of the source under test. In addition, the wavelength of wavelength difference (specification of wavelength difference, It is determined in order to judge the degree of the difference in wavelength, and therefore can be elastically adjusted as needed.

According to this, if the wavelength difference is less than or equal to the wavelength difference range ( < And determining that the inflection point of the measured light source passes the determination condition, that is, the wavelength of the inflection point of the measured light source is close to the inflection point wavelength corresponding to the reference light source. On the other hand, if the wavelength difference is greater than the wavelength difference range ( ≧ And determining that the inflection point of the measured light source is a non-passing determination condition, that is, the wavelength of the inflection point of the measured light source has a large difference from the wavelength of the inflection point corresponding to the reference light source, and exceeds Judging criteria.

For example, the wavelength difference between the measured light source and the first inflection point of the reference light source is: Wavelength difference=|wavelength corresponding to the first inflection point of the measured light source-wavelength corresponding to the first inflection point of the reference light source|=|440-441|=1

According to this calculation method, the wavelength difference corresponding to other inflection points in Table 7 can be known. According to the value of Table 7, the wavelength difference of the first inflection point is smaller than the corresponding wavelength difference range (1<15), so the first inflection point of the measured light source passes the determination condition. Further, the above can also be understood as the wavelength of the first inflection point of the measured light source falling within the range of 426 nm to 456 nm (441 nm ± 15.00 nm).

Then compare the wavelength difference of the third inflection point. The wavelength difference of the third inflection point is greater than the wavelength difference range of the third inflection point (17>10), so the third inflection point of the measured light source does not pass the determination condition, that is, the figure in FIG. The wavelength difference between the measured light source and the reference light source at the third inflection point is outside the range of the specification.

According to the above manner, the inflection point of the spectral curve of the measured light source is analyzed one by one, and the spectral curve of the measured light source has three inflection points passing the determination condition, but three inflection points fail to pass the determination condition, so in the step S6 The computer determines that the measured light source and the reference light source are the same type of light source of the same color.

In summary, the light source to be tested and the reference light source can be analyzed by the light source screening method of the present invention, and the two are determined to be heterochromic light sources, and the LED package of the light source to be tested can be further known. The type of phosphor used in the body is different from the LED package used in the reference source. Fluorescent powder type.

It should be noted that the wavelength difference range may be adjusted according to different types of light sources and requirements, and is not limited to the content disclosed in the embodiment. In addition, the measured light source determines that the measured light source does not pass the determination condition of step S6 as long as there is a criterion that the inflection point does not pass the corresponding range of the wavelength difference. Furthermore, the determination condition of step S6 can also be adjusted as follows, and has the same effect: if the wavelength difference is less than or equal to the wavelength difference range ( And determining that the measured light source is a pass determination condition; if the wavelength difference is greater than the wavelength difference range ( And determining that the light source under test is a failure determination condition.

Referring to FIG. 1, FIG. 2, FIG. 6, and FIG. 7, the steps of the present embodiment for analyzing an LED package of the same light source type are described below.

6 is a spectral curve of two LED packages of the first light source type, wherein the spectral curve of the measured light source is indicated by a broken line, and the reference light source is indicated by a solid line. The converted spectral curves of Fig. 7 are obtained by converting the spectral curves in Fig. 6 according to the aforementioned calculation formula. The manner of conversion of the converted spectral curves and the technical contents of the execution steps S1 to S6 in FIG. 1 are as described above, and will not be further described herein.

Table 8 is a data table obtained by analyzing the spectral curve and the conversion spectrum curve of the measured light source and the reference light source in FIGS. 6 and 7. As can be seen from FIG. 2, the CIE coordinates of both of them fall within the same predetermined interval, and the judgment condition of step S2 is passed. Next, as can be seen from Table 8, the measured light source and the reference light source have six inflection points, so the computer determines that it passes the judgment condition of step S5. Furthermore, since the wavelength difference between the six inflection points of the measured light source is smaller than the corresponding wavelength difference range, the computer can determine that the light source under test passes the judgment condition of step S6. It can be seen that the final judgment result is R3: the measured light source and the reference light source are the same type of light source of the same color, that is, the spectral curves of the two have similar characteristics, and the spectral analysis results can further determine that both use the same component of the firefly. Light powder.

In summary, the light source screening method of the present invention can distinguish whether the measured light source and the reference light source are different color light sources, and further determine whether the measured light source and the reference light source belong to the same type of light source of the same color. In practical applications, the LED package of the known phosphor component can be set as the By referring to the light source and comparing the LED package of the unknown phosphor component by the light source screening method of the present invention, the LED package of the same color (fluorescent powder, spectral curve and the same type) as the reference light source can be screened. . On the other hand, the light source screening method of the present invention can perform CIE coordinates and spectral characteristics analysis on various light sources, and thus can be applied to light source analysis and screening other than the LED package, so that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

S1~S6‧‧‧Steps

△I‧‧‧Light intensity change

R1~R3‧‧‧ judgment result

△I(λ)‧‧‧ conversion spectral curve function

I‧‧‧Light intensity

I(λ)‧‧‧ spectral curve function

Λ‧‧‧wavelength

1 is a flow chart illustrating the execution steps of a preferred embodiment of the light source screening method of the present invention; and FIG. 2 is a diagram illustrating the CIE of a plurality of LED packages of two different types of light sources of the same color or of the same color. 1931 coordinate distribution; FIG. 3 is a spectrum curve of two LED packages of different color sources; FIG. 4 is a conversion spectrum curve obtained by data conversion in FIG. 3; FIG. 5 is a spectrum curve and a conversion spectrum curve. Schematic diagram of the relative relationship; FIG. 6 is a spectral graph of two LED packages of the same color source of the same type; and FIG. 7 is a graph of the converted spectrum obtained by data conversion of FIG.

S1~S6‧‧‧Steps

R1~R3‧‧‧ judgment result

Claims (9)

A light source screening method includes the following steps: (A) receiving a measurement data of a measured light source, the measurement data comprising a plurality of wavelength information and a plurality of light intensity information respectively corresponding to the same wavelength information; (B) Converting the measurement data to determine whether the CIE coordinate of the measured light source falls within a predetermined interval that is the same as a reference light source, and if the determination result is "Yes", performing step (C); (C) by the plurality of Wavelength information and the plurality of light intensity information to present a spectral curve of the measured light source, and converting the light intensity information in the spectral curve of the measured light source into a plurality of corresponding light intensity change amount information, respectively, by The wavelength information and the light intensity change amount information corresponding to a converted spectral curve of the measured light source; (D) analyzing the number of inflection points of the spectral curve and the wavelength corresponding to each inflection point according to the converted spectral curve; (E) determining whether the number of inflection points of the respective spectral curves of the measured light source and the reference light source are the same, and if the determination result is "Yes", performing step (F); and (F) determining all the measured light sources and Spectra of the reference source Line corresponding to the wavelength difference between the inflection point is within a predetermined wavelength range corresponding to the difference, if the determination result is "Yes", it is determined by the photometric light source and the reference light is the same color type. The light source screening method according to claim 1, wherein the step (B) further comprises the following steps: Using the calculation method in CIE15-2004, the measurement data is converted into the CIE1931 coordinate to determine whether the measured light source falls within the predetermined interval that is the same as the reference light source. The light source screening method according to claim 1, wherein if the determination result in the step (B) is "NO", it is determined that the light source to be measured and the reference light source are different color light sources. The light source screening method according to claim 1, wherein if the determination result in the step (E) is "NO", it is determined that the light source to be measured and the reference light source are light sources of the same color. The light source screening method according to claim 1, wherein if the determination result in the step (F) is "NO", it is determined that the light source to be measured and the reference light source are light sources of the same color. The light source screening method according to claim 1, wherein in the step (D), the converted spectral curve has a plurality of peak points and a plurality of valley points, each of the peak points corresponding to a peak wavelength, The equivalence points each correspond to a valley wavelength, wherein all peak wavelengths or valley wavelengths are wavelengths of the inflection point of the measured light source. A light source screening method includes the following steps: analyzing whether a CIE coordinate of a measured light source falls within a predetermined interval of a reference light source by a CIE coordinate to determine whether the measured light source and the reference light source have the same or similar Illuminating color; and analyzing the measured light source through a spectral curve, the spectral curve is used to compare a bending difference between a spectral curve of the measured light source and a spectral curve of the reference light source to determine the measured light source and the reference Whether the light source has the same Or a similar spectral curve. The light source screening method according to claim 7, wherein the spectral graph analysis further comprises a converting step of converting the spectral curve of the measured light source and the reference light source into a converted spectral curve, respectively. A converted spectral curve of the measured light source and the reference light source to analyze a bending difference of the spectral curve. The light source screening method according to claim 8 , further comprising a calculating step of analyzing the spectrum by calculating the number of inflection points of each of the spectral curves and the wavelength difference corresponding to each of the inflection points The difference in bending of the curve.