Multi-chip UV LED spectrometry method

Abstract

The present invention discloses a multi-chip UV LED spectrometry method, which includes obtaining radiation spectrum curves of different bands, primary screening of global band spectral differences, secondary screening of regional band spectral differences, and grading and classification based on phase difference. Building on existing conventional testing, the present invention further subdivides the radiation spectrum of multi-chip UV LED light source beads from overall global screening to regional screening, performing multiple spectral screenings in different bands, effectively controlling the sorting accuracy of UV light source devices and improving reliability.

Description

Technical Field

[0001] The present invention relates to the field of light source device spectrometry, and in particular to a multi-chip ultraviolet (UV) LED spectrometry method. Background Art

[0002] In the existing technology, the radiation spectrum of ultraviolet UV LED lamp beads largely determines the radiation characteristics of the lamp beads. There may be large differences in the consistency and uniformity of the spectral curves among the same batch of ultraviolet light source devices, which may not meet the requirements. Ultimately, it affects the performance and function of the entire module terminal product composed of multiple multi-chip ultraviolet light source devices, especially under conditions with high requirements for product use conditions, and cannot meet the corresponding requirements.

[0003] In the current multi-chip ultraviolet light source device packaging and manufacturing process, the spectral method for the radiation characteristics of ultraviolet lamp beads is mainly to collect the entire full-band spectrum curve data and conduct conventional analysis of its single peak wavelength, half-wave width, radiation power, etc., and then archive and classify each ultraviolet light source device according to the test results. The single full-band spectrum curve data test results may have certain detection limitations and potential defects due to the lack of simultaneous multiple parallel and independent processing of regional radiation spectrum collection data analysis. The light source device has different yield control in the spectral link, and may cause a potential high possibility of failure of the product's normal use function. Summary of the Invention

[0004] The technical solution of the present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the main purpose of the present invention is to provide a multi-chip ultraviolet UV LED spectroscopic method, which, based on the conventional detection and analysis of the radiation spectrum curve of the ultraviolet UV LED device, further corresponds to the radiation spectrum curves of multiple regional bands contained in the entire global band radiation spectrum curve, and adopts a regional spectrum collection, detection and analysis method with multiple parallel and independent processing, so as to more accurately grade and archive each ultraviolet UV LED device, thereby effectively improving the consistency and uniformity of the spectrum curves between ultraviolet UV LED lamp beads, and finally obtaining a high-quality LED product with high consistency of the various photoelectric parameters of each ultraviolet UVLED lamp bead.

[0005] To achieve the above object, the present invention provides a multi-chip UV LED spectrophotometry method, comprising the following steps:

[0006] Get radiation spectrum curves in different bands:

[0007] Through the optical capture detection head of the input module, and in combination with the global band spectrum card A, the regional band spectrum card B and the regional band spectrum C, etc., the global band radiation spectrum curve graph a, the regional band spectrum curve graph b and the regional band spectrum curve graph c of the corresponding ultraviolet LED lamp bead to be tested are obtained, and then the entire spectrum curve graph data obtained above is recorded and stored in the microcomputer central processing unit;

[0008] One-time screening of spectral differences across all bands:

[0009] The full-band spectrum card A in the processing module calculates the difference between the full-band spectrum curve a of a single lamp bead and the standard full-band spectrum, that is, the phase difference ΔEa;

[0010] Then, based on whether the calculated global band spectrum difference ΔEa value is within the preset ΔEa threshold range, if the lamp bead is determined to be within the threshold range, the next step of multi-regional band spectrum difference secondary screening can be performed; otherwise, the lamp bead outside the threshold range cannot be screened in the next step;

[0011] Secondary screening of regional band spectral differences:

[0012] The lamp beads that meet the primary screening threshold range are then processed simultaneously by a specific regional band spectrum card B and another specific regional band spectrum card C in the processing module to independently calculate the values ​​of the difference between the regional band spectrum curves b and c set in the global band of the lamp beads and the standard regional band spectrum graph, and the values ​​are transmitted together to the output module grade sorting and classification unit for sorting;

[0013] Classification by degree of difference:

[0014] According to the calculated phase difference ΔEa, ΔEb and ΔEc values ​​falling within the preset grade gradient range, each lamp bead is sorted and classified one by one.

[0015] As a further solution of the present invention, the ultraviolet LED lamp bead is a multi-chip ultraviolet UVLED lamp bead composed of a chip with a peak wavelength average value in the range of 367-370nm and another chip with a peak wavelength average value in the range of 400-403nm.

[0016] As a further solution of the present invention, the wavelength range of the identification area of ​​Spectrum Card B and Spectrum Card C is set to use the wavelength value corresponding to the lowest curve valley point between two peaks in the spectrum graph within the global band of 200-450nm as the identification distinction point.

[0017] The beneficial effects of the present invention are as follows:

[0018] The multi-chip ultraviolet UV LED spectroscopic method proposed in the present invention can further screen the radiation spectrum of multi-chip ultraviolet LED light source lamp beads from the overall global screening to the regional screening on the basis of existing conventional detection, and perform spectral screening of different bands multiple times, thereby effectively controlling the sorting accuracy of ultraviolet UV light source devices and improving reliability. Finally, high-quality high-end products with higher uniformity of the radiation spectrum curve of ultraviolet UV LED lamp beads of the same batch can be obtained. The spectroscopic yield rate of ultraviolet device products can be improved compared with others, thereby reducing the potential failure risk. At the same time, it promotes the continuity of manufacturing production links, shortens production time, and reduces manufacturing costs while improving quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the technical solutions of the present invention or the technical solutions of the invention in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the technical solutions of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the main structure of the spectroscopic method in the present invention.

[0021] Figure 2 The figure is a schematic diagram of the steps of the spectroscopic method of the present invention.

[0022] Figure 3 This is a typical radiation spectrum curve in the present invention.

[0023] Figure 4 Schematic diagram of the global band spectral phase difference ΔEa in the present invention.

[0024] Figure 5 Schematic diagram of the shaded area of ​​the spectral phase difference ΔEb in the 200-385nm region of the present invention.

[0025] Figure 6 Schematic diagram of the shaded area of ​​the spectral phase difference ΔEc in the 385-450nm region of the present invention. DETAILED DESCRIPTION

[0026] as follows:

[0027] Please see the attached Figure 1-6 ,

[0028] The multi-chip UV LED spectroscopic method can simultaneously detect and sort lamp beads composed of at least two chips. To further better illustrate the specific embodiment of the invention method, a multi-chip UV LED product consisting of a chip with a peak wavelength average range of 367-370nm and another chip with a peak wavelength average range of 400-403nm is selected. The typical radiation spectrum of this type of product is shown in the figure below. Figure 3 The specific implementation steps are as follows:

[0029] Obtain radiation spectrum curves of different bands: the optical capture detection head of the input module detects the ultraviolet LED lamp bead to be tested which is driven by a constant current circuit, and simultaneously collects and reads together with the global band spectrum card A, the regional band spectrum card B and the regional band spectrum C. One spectrum card triggers the optical capture detection head once, and obtains the corresponding global band radiation spectrum curve a, the regional band spectrum curve b and the regional band spectrum curve c of the ultraviolet LED lamp bead to be tested. Together, the spectrum curve data of these three spectrum curves are entered and stored in the internal storage unit of the microcomputer central processing unit with the same reference coordinate system and the same reference coordinate origin and other spectrum elements; on the original conventional detection equipment, the three spectrum cards, namely spectrum card A, spectrum card B and spectrum card C, are built into the microcomputer central processing unit in a software-based processing and operation mode without the need to add corresponding hardware equipment, so as to improve the feasibility and convenience of operation. For the convenience of demonstration, three spectrum cards are selected in this embodiment, and this method can support the expansion of the number of spectrum cards to several.

[0030] A preferred embodiment of the present invention: before performing the first screening of the global band and the second screening of the regional band, it is necessary to set the standard spectrum of the production batch as the calculation reference value for the corresponding screening. The standard spectrum parameter setting is based on the historical standard spectrum associated with the same model of the previous batch production as a reference. According to the expected product target, a certain spectral difference ΔE threshold of not more than 3% is preset, and sorting and screening are performed within a preset period of time. The preset time can be the time required for the pre-sorted quantity to be about one-third of the total quantity of the batch. Finally, the spectrum corresponding to the lowest spectral difference ΔE value is selected and set as the standard spectrum of the product model of this batch. It can then be dynamically updated in a targeted manner to adapt to the actual production situation of each batch, thereby further improving the accuracy of sorting and screening.

[0031] Furthermore, the phase difference ΔEn used in the calculation method represents the percentage of the area formed by the absolute value of the difference between the two radiation spectrum curves (i.e., the shaded area in the two spectrum graphs) to the total area enclosed by the two spectrum curves. The smaller the value of the phase difference ΔEn, the smaller the difference between the two spectrum curves, that is, the closer the two spectrum curves are:

[0032] ΔEn=ΔS area difference / ΔS area sum

[0033] A screening of the global band spectrum difference: The global band spectrum card A covering the 200-450nm band in the processing module is used to calculate the difference between the global band spectrum curve a of a single lamp bead and the standard global band spectrum, that is, the phase difference ΔEa. Figure 4 The diagram shows the global band spectrum difference ΔEa; based on whether the calculated global band spectrum difference ΔEa value is within the preset phase difference ΔEa threshold range, the threshold range can be set to a phase difference ΔEa lower than 5%. If the judgment result is that the lamp beads are within the threshold range, the next step of secondary screening of multi-region band spectrum differences can be carried out. Otherwise, the lamp beads outside the threshold range cannot be screened in the next step. The global primary screening can further ensure the consistency of the radiation spectrum curve, and after the primary screening, the scope of subsequent screening is narrowed, thereby improving the calculation efficiency and accuracy of the subsequent secondary screening.

[0034] Secondary screening of regional band spectrum differences: After the first screening of the global band spectrum, there may be some lamp beads with similar or even identical global band spectrum difference ΔEa values, but with large differences in the spectrum curves in some specific regional bands within the global band spectrum curve, which cannot accurately reflect the difference between the two radiation spectrum curves. Therefore, secondary screening of regional band spectrum is still required after the first screening, which can more accurately characterize the differences in the spectrum curves and improve the sorting accuracy.

[0035] The lamp beads that meet the primary screening threshold range are then processed simultaneously by a specific spectrum card B that can only identify the processing area 200-385nm band and another specific spectrum card C that can only identify the processing area 385-450nm band in the processing module. The difference between the regional band spectrum curves b and c set in the lamp bead's global band and the standard regional band spectrum curves is calculated in parallel and independently. The difference ΔEb and ΔEc between the two correspond to the following respectively: Figure 5 ,like Figure 6 As shown, the values ​​are transmitted together to the output module grade sorting and classification unit for sorting; the regional secondary screening is to use an independent spectral card to re-analyze the local regional bands within the global band range. Compared with a single global band screening, the regional screening of multiple independent parallel processing has a smaller band range for calculation and processing, thereby improving the computing power and speed. At the same time, the accuracy of multiple detections is further improved, thereby reducing the blind spots of the global one-time screening and timely discovering potential risks.

[0036] A preferred embodiment of the present invention is that the wavelength range of the areas identified by Spectral Cards B and C is set to the wavelength value corresponding to the lowest curve valley point between two peaks in the spectrum graph within the global wavelength range of 200-450nm as the identification point, which facilitates the distinction between calculations and improves calculation efficiency and accuracy.

[0037] A preferred embodiment of the present invention is that the secondary screening of the regional band spectrum can also identify and detect the corresponding peak wavelength within the band range of each region.

[0038] Grade sorting and classification based on phase difference: The grade sorting and classification unit of the output module receives the execution command information fed back from the processing module, that is, the phase difference ΔEb and phase difference ΔEc values ​​calculated according to the secondary screening fall within the preset different grade gradient ranges, and can sort and classify each lamp bead one by one with high precision. For example, if the values ​​of a pair of phase difference ΔEb1 and phase difference ΔEC1 of a UV lamp bead are detected to be within the ranges of 1-3% and 2-4% respectively, it is selected as a first-grade product; if the values ​​of a pair of phase difference ΔEb2 and phase difference ΔEC2 of another UV lamp bead are within the ranges of 3-6% and 4-6% respectively, it is selected as another grade product.

[0039] This can be achieved by first screening the difference in the entire full-band spectrum and then independently and in parallel performing a secondary screening of the difference in the spectrum in multiple regional bands, thereby effectively improving the consistency of various photoelectric property parameter indicators of the same batch of ultraviolet UVLED lamp beads. In particular, it can screen out radiation spectrum curves with high uniformity, greatly improving the quality of the same batch of ultraviolet LED products.

[0040] The above description is only a preferred embodiment of the technical solution of the present invention, and does not limit the patent scope of the technical solution of the present invention. All equivalent structural transformations made by using the contents of the technical solution description and drawings of the present invention under the conception of the technical solution of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the technical solution of the present invention.

Claims

1. A multi-chip UV LED spectrometry method, characterized in that: The following steps are involved: S1. Obtain radiation spectrum curves in different bands: Through the optical capture detection head of the input module, and in combination with the global band spectrum card A, the regional band spectrum card B and the regional band spectrum card C, the global band radiation spectrum curve graph a, the regional band spectrum curve graph b and the regional band spectrum curve graph c of the corresponding ultraviolet LED lamp bead to be tested are obtained, and then the entire spectrum curve graph data obtained above is recorded and stored in the microcomputer central processing unit; S2. One-time screening of spectral differences across all bands: The full-band spectrum card A in the processing module calculates the difference between the full-band spectrum curve a of a single lamp bead and the standard full-band spectrum, that is, the phase difference ΔEa; Then, based on whether the calculated global band spectrum difference ΔEa value is within the preset ΔEa threshold range, if the lamp bead is determined to be within the threshold range, the next step of multi-regional band spectrum difference secondary screening can be performed; otherwise, the lamp bead outside the threshold range cannot be screened in the next step; S3. Secondary screening of regional band spectral differences: The lamp beads that meet the primary screening threshold range are then processed simultaneously by a specific regional band spectrum card B and another specific regional band spectrum card C in the processing module to independently calculate the values ​​of the difference between the regional band spectrum curves b and c set in the global band of the lamp beads and the standard regional band spectrum graph, and the values ​​are transmitted together to the output module grade sorting and classification unit for sorting; S4. Classify by degree of difference: According to the calculated phase difference ΔEa, ΔEb and ΔEc values ​​falling within the preset grade gradient range, each lamp bead is sorted and classified one by one. The UV LED lamp bead is a multi-chip UV LED lamp bead composed of a chip with a peak wavelength average range of 367-370nm and another chip with a peak wavelength average range of 400-403nm. The wavelength ranges of the identification areas of Spectrum Card B and Spectrum Card C are set based on the wavelength value corresponding to the lowest curve valley point between two peaks in the spectrum graph within the global wavelength range of 200-450nm as the identification point.

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