CN111107948B - Screening method and device for LED chips to be transferred - Google Patents

Screening method and device for LED chips to be transferred Download PDF

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CN111107948B
CN111107948B CN201980003330.7A CN201980003330A CN111107948B CN 111107948 B CN111107948 B CN 111107948B CN 201980003330 A CN201980003330 A CN 201980003330A CN 111107948 B CN111107948 B CN 111107948B
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led chips
frequency
threshold value
screening
transferred
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CN111107948A (en
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许时渊
周充祐
陈淑枝
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Chongqing Kangjia Photoelectric Technology Research Institute Co Ltd
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Chongqing Kangjia Photoelectric Technology Research Institute Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/36—Sorting apparatus characterised by the means used for distribution
    • B07C5/361—Processing or control devices therefor, e.g. escort memory
    • B07C5/362—Separating or distributor mechanisms

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Abstract

The invention provides a method and a device for screening LED chips to be transferred, wherein the method comprises the following steps: receiving a light beam generated by the LED chip; carrying out spectrum analysis on the light beam to obtain spectrum information corresponding to the light beam; and screening the LED chips to be transferred according to the frequency spectrum information. The spectrum information corresponding to the light beam generated by the LED chip is compared with the preset threshold value to screen the LED chip to be transferred, the color purity of the screened LED chip is qualified and has no color difference, the light emitting consistency is high, the light uniformity can be effectively distinguished for RGB display, and then the mixed light color uniformity is displayed.

Description

Screening method and device for LED chips to be transferred
Technical Field
The invention belongs to the technical field of semiconductor photoelectron, and particularly relates to a method and a device for screening LED chips to be transferred.
Background
The Micro-LED technology, namely the LED Micro-scaling and matrixing technology, has the advantages of good stability, long service life and high operating temperature, simultaneously has the advantages of low power consumption, high color saturation, high reaction speed, high contrast and the like of the LED, and has higher brightness and lower power consumption, so that the Micro-LED has great application prospect.
The mass transfer of Micro-LEDs is the transfer of thousands of LEDs on a carrier substrate to a target backplane to form the final Micro-LED display device. Before carrying out massive transfer on Micro-LEDs, the LEDs need to be screened, and each transferred LED can be ensured to be normally used. The existing screening method is equipment which is used for electrifying an LED and judging whether the LED emits light to determine whether the LED is transferred or not, and has higher requirement on LED light emission consistency, and the screening method is not suitable for the equipment.
Therefore, the prior art is subject to further improvement.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a method and a device for screening an LED chip to be transferred, and overcomes the defect that in the prior art, whether an LED is transferred or not is determined by judging whether the LED emits light or not, and equipment with higher requirements on LED light emitting consistency is not suitable.
The first embodiment disclosed by the invention is a screening method of LED chips to be transferred, wherein the screening method comprises the following steps:
receiving a light beam generated by the LED chip;
carrying out spectrum analysis on the light beam to obtain spectrum information corresponding to the light beam;
and screening the LED chips to be transferred according to the frequency spectrum information.
The LED chip screening method comprises the steps that the frequency spectrum information comprises the full width at half maximum of a frequency spectrum and the frequency corresponding to the wave crest of the frequency spectrum.
The method for screening the LED chips to be transferred comprises the following steps of:
judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first threshold value or not, and judging whether the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard frequency is smaller than a preset second threshold value or not;
and if the full width at half maximum of the frequency spectrum is smaller than a preset first threshold value, and the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard frequency is smaller than a preset second threshold value, determining that the LED chip is the LED chip to be transferred.
The screening method of the LED chips to be transferred is characterized in that the step of receiving the light beams generated by the LED chips further comprises the following steps:
and applying a driving voltage to the LED chip to enable the LED chip to generate a light beam.
The method for screening the LED chips to be transferred further comprises the following steps of:
obtaining spectrum information of a plurality of LED chips, and determining the first threshold value and the standard frequency according to the spectrum information.
The screening method of the LED chips to be transferred comprises the steps of screening the LED chips to be transferred, wherein the LED chips comprise red LED chips, green LED chips and blue LED chips.
The method for screening the LED chips to be transferred comprises the following steps of:
and judging the type of the LED chip.
The screening method of the LED chips to be transferred comprises the following steps that a first threshold value comprises a first red light threshold value, a first green light threshold value and a first blue light threshold value; the standard frequencies include a red standard frequency, a green standard frequency, and a blue standard frequency.
The screening method of the LED chips to be transferred comprises the following steps of obtaining spectrum information of a plurality of LED chips, and determining the first threshold value and the standard frequency according to the spectrum information:
obtaining frequency spectrum information of a plurality of red light LED chips, and determining the first red light threshold value and the red light standard frequency according to the frequency spectrum information;
obtaining spectrum information of a plurality of green light LED chips, and determining the first green light threshold value and the green light standard frequency according to the spectrum information;
obtaining spectrum information of a plurality of blue light LED chips, and determining the first blue light threshold value and the blue light standard frequency according to the spectrum information.
The method for screening the LED chips to be transferred comprises the following steps of, when the LED chips are red LED chips, screening the LED chips to be transferred according to the frequency spectrum information:
judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first red light threshold value or not, and judging whether the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the standard red light frequency is smaller than a preset second threshold value or not;
and if the full width at half maximum of the frequency spectrum is smaller than a preset first red light threshold value, and the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard frequency of the red light is smaller than a preset second threshold value, determining that the LED chip is the LED chip to be transferred.
The method for screening the LED chips to be transferred comprises the following steps of, when the LED chips are green LED chips, screening the LED chips to be transferred according to the frequency spectrum information:
judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first green light threshold value or not, and judging whether the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the green light standard frequency is smaller than a preset second threshold value or not;
and if the full width at half maximum of the frequency spectrum is smaller than a preset first green light threshold value, and the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the green light standard frequency is smaller than a preset second threshold value, determining that the LED chip is the LED chip to be transferred.
The method for screening the LED chips to be transferred comprises the following steps of, when the LED chips are blue LED chips, screening the LED chips to be transferred according to the frequency spectrum information:
judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first blue light threshold value or not, and judging whether the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard frequency of the blue light is smaller than a preset second threshold value or not;
and if the full width at half maximum of the frequency spectrum is smaller than a preset first blue light threshold value, and the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard frequency of the blue light is smaller than a preset second threshold value, determining that the LED chip is the LED chip to be transferred.
The method for screening the LED chips to be transferred further comprises the following steps of:
generating a position information file according to the position information of the LED chip to be transferred;
and transferring the LED chip to be transferred according to the position information file.
The second embodiment disclosed by the invention is a screening device of LED chips to be transferred, which comprises:
the detector is used for receiving the light beam generated by the LED chip;
the spectrum analyzer is used for carrying out spectrum analysis on the light beam to acquire spectrum information corresponding to the light beam;
and the processor is used for screening out the LED chips to be transferred according to the frequency spectrum information.
The screening device of waiting to shift LED chip wherein, still include:
and the voltage applier is used for applying a driving voltage to the LED chip so that the LED chip generates a light beam.
The method and the device for screening the LED chips to be transferred have the advantages that the spectrum information corresponding to the light beams generated by the LED chips is compared with the preset threshold value to screen the LED chips to be transferred, the color purity of the screened LED chips is qualified, the color difference does not exist, the luminous consistency is high, the light uniformity can be effectively distinguished for RGB display, and the uniformity of the displayed mixed light color is further achieved.
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FIG. 1 is a flow chart of a preferred embodiment of a method for screening LED chips to be transferred according to the present invention;
FIG. 2 is a flow chart of an embodiment of the present invention for screening LED chips to be transferred;
fig. 3 is a schematic structural diagram of a screening device for LED chips to be transferred according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Because whether the LED is transferred or not is determined by judging whether the LED emits light or not in the prior art, the screening mode is not applicable to equipment with higher requirements on LED light emitting consistency. In order to solve the above problems, an embodiment of the present invention provides a method for screening an LED chip to be transferred.
Referring to fig. 1, the method for screening LED chips to be transferred according to the present invention includes the following steps:
s1, receiving the light beam generated by the LED chip;
s2, carrying out spectrum analysis on the light beam to obtain spectrum information corresponding to the light beam;
and S3, screening the LED chips to be transferred according to the frequency spectrum information.
In a specific embodiment, because the existing LED chip screening method simply judges whether the LED chip emits light or not to transfer the LED chip, the LED chip screened by the method has poor light emission consistency. Because the light emitting consistency of the LED chip is related to the frequency spectrum of the LED chip, in order to solve the problems, after the light beam generated by the LED chip is received in the embodiment, the light beam is input into the spectrum analyzer, the spectrum analyzer performs spectrum analysis on the obtained light beam and outputs spectrum information, then the LED chip to be transferred is screened according to the obtained spectrum information, and the light emitting consistency of the screened LED chip is better because the spectrum information of the screened LED chip is consistent.
In a specific embodiment, the spectrum information includes a full width at half maximum of the spectrum and a frequency corresponding to a peak of the spectrum, and the step S3 specifically includes:
s31, judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first threshold value or not, and judging whether the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the standard frequency is smaller than a preset second threshold value or not;
and S32, if the full width at half maximum of the frequency spectrum is smaller than a preset first threshold value, and the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the standard frequency is smaller than a preset second threshold value, determining that the LED chip is the LED chip to be transferred.
In a specific embodiment, the spectrum information includes a full width at half maximum of the spectrum and a frequency corresponding to a peak of the spectrum, and a first threshold, a standard frequency, and a second threshold are preset. The full width at half maximum of the frequency spectrum reflects the color purity of the LED chip, and after the frequency spectrum information is obtained, whether the full width at half maximum of the frequency spectrum in the frequency spectrum information is smaller than a preset first threshold value or not is judged, so that the screened LED chip has good color purity. And judging whether the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum of the LED chip and the standard frequency is smaller than a preset second threshold value or not so as to enable the screened LED chip to have no color difference. In this embodiment, the LED chips are screened by determining whether the full width at half maximum of the frequency spectrum is smaller than a preset first threshold and whether the absolute value of the difference between the frequency corresponding to the peak of the frequency spectrum and the standard frequency is smaller than a preset second threshold, and when the light beam emitted by the LED chip satisfies that the full width at half maximum of the frequency spectrum is smaller than the preset first threshold and the absolute value of the difference between the frequency corresponding to the peak of the frequency spectrum and the standard frequency is smaller than the preset second threshold, the LED chip is determined to be the LED chip to be transferred, so that the LED chip with high color purity, no color difference and good light emitting consistency can be screened.
In a specific embodiment, the step S1 is preceded by the steps of:
and S0, applying a driving voltage to the LED chip to enable the LED chip to generate a light beam.
In one embodiment, in order to obtain the spectrum information of the light beam generated by the LED chip, a driving voltage is applied to the LED chip in advance to enable the LED to generate the light beam. The driving voltage varies according to chip differences, and in one embodiment, the driving voltage is 2.9-3.1V and decreases as the chip size decreases.
In a specific embodiment, the step S3 further includes the following steps:
m3, obtaining the spectrum information of a plurality of LED chips, and determining the first threshold and the standard frequency according to the spectrum information.
In a specific embodiment, before the step of screening the LED chips to be transferred according to the spectrum information, spectrum information of a plurality of LED chips needs to be acquired, a plurality of spectrum information corresponding to the plurality of LED chips is generated, and the first threshold and the standard frequency are determined according to the plurality of spectrum information. The LED chips are normal LED chips, and considering that different batches of LED chips have differences, in a specific embodiment, the LED chips are normal LED chips in the same batch as the LED chips to be transferred.
In a specific embodiment, after the spectrum information of the plurality of LED chips is obtained, an average value of the full widths at half maximum of the spectra in each spectrum information is taken as a preset first threshold, for example, the first threshold is 10 to 30 nm. After the frequency spectrum information of the plurality of LED chips is obtained, the average value of the frequencies corresponding to the wave crests of the frequency spectrum in each frequency spectrum information is taken as the standard frequency. The first threshold and the standard frequency are set according to the average value of the plurality of LED chips, and the LED chips with qualified color purity and no color difference can be screened according to the LED batch.
In a specific embodiment, the LED chips include a red LED chip, a green LED chip, and a blue LED chip; the first threshold comprises a first red light threshold, a first green light threshold, and a first blue light threshold; the standard frequencies include a red standard frequency, a green standard frequency and a blue standard frequency, and the step M3 includes:
m31, obtaining spectrum information of a plurality of red light LED chips, and determining the first red light threshold value and the red light standard frequency according to the spectrum information;
m32, acquiring spectrum information of a plurality of green light LED chips, and determining the first green light threshold and the green light standard frequency according to the spectrum information;
m33, obtaining spectrum information of a plurality of blue light LED chips, and determining the first blue light threshold and the blue light standard frequency according to the spectrum information.
In a specific embodiment, the LED chips include a red LED chip, a green LED chip, and a blue LED chip, and since the full width at half maximum of the frequency spectrum of the LED chips with different colors and the frequency corresponding to the peak of the frequency spectrum have differences, in order to further screen out the LED chips with high color purity and no color difference, in this embodiment, the first threshold, that is, the first red threshold, the first green threshold, and the first blue threshold, of the red LED chip, the green LED chip, and the blue LED chip are respectively set when the first threshold and the standard frequency are set. And simultaneously, the standard frequencies of the red light LED chip, the green light LED chip and the blue light LED chip, namely the red light standard frequency, the green light standard frequency and the blue light standard frequency, are respectively set.
Specifically, when a first threshold value and a standard frequency are determined, spectrum information of a plurality of red light LED chips, a plurality of green light LED chips and a plurality of blue light LED chips needs to be obtained respectively, and an average value of frequencies corresponding to a half-height width of a spectrum and a peak of the spectrum corresponding to the spectrum information of the plurality of red light LED chips is taken as a first red light threshold value and a red light standard frequency respectively; taking the average values of the full width at half maximum of the frequency spectrums corresponding to the frequency spectrum information of the green light LED chips and the frequencies corresponding to the wave peaks of the frequency spectrums as a first green light threshold value and a green light standard frequency respectively; and taking the average values of the full width at half maximum of the frequency spectrum corresponding to the frequency spectrum information of the plurality of blue light LED chips and the frequency corresponding to the wave crest of the frequency spectrum as a first blue light threshold value and a blue light standard frequency respectively. The method for acquiring the spectrum information of the plurality of red light LED chips, the plurality of green light LED chips and the plurality of blue light LED chips is the same as the method for acquiring the spectrum information of the LED chips to be screened in the foregoing step, and is not described herein again.
In a specific embodiment, when the LED chip is a red LED chip, the step S3 includes:
s311, judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first red light threshold value, and judging whether the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the standard red light frequency is smaller than a preset second threshold value;
s321, if the full width at half maximum of the frequency spectrum is smaller than a preset first red light threshold value, and the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the standard red light frequency is smaller than a preset second threshold value, determining that the LED chip is the LED chip to be transferred.
In a specific embodiment, before the step of screening out the LED chips to be transferred according to the spectrum information, the type of the LED chip needs to be determined, that is, whether the LED chip belongs to a red LED chip, a green LED chip, or a blue LED chip is determined. When the LED chip is a red light LED chip, comparing the full width at half maximum of the frequency spectrum in the frequency spectrum information with a preset first red light threshold, and comparing the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum in the frequency spectrum information and the standard frequency of the red light with a preset second threshold, and when the full width at half maximum of the frequency spectrum is smaller than the preset first red light threshold, and the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the standard frequency of the red light is smaller than the preset second threshold, determining that the red light LED chip is the LED chip to be transferred.
In a specific embodiment, when the LED chip is a green LED chip, the step S3 includes:
s311', judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first green light threshold value, and judging whether the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the green light standard frequency is smaller than a preset second threshold value;
s321', if the full width at half maximum of the frequency spectrum is smaller than a preset first green light threshold value, and the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the standard frequency of the green light is smaller than a preset second threshold value, determining that the LED chip is the LED chip to be transferred.
In a specific embodiment, when the LED chip is a green LED chip, the full width at half maximum of the spectrum in the spectrum information is compared with a preset first green threshold, and an absolute value of a difference between a frequency corresponding to a peak of the spectrum in the spectrum information and a green standard frequency is compared with a preset second threshold, and when the full width at half maximum of the spectrum is smaller than the preset first green threshold, and the absolute value of a difference between the frequency corresponding to the peak of the spectrum and the green standard frequency is smaller than the preset second threshold, the green LED chip is determined to be the LED chip to be transferred.
In a specific embodiment, when the LED chip is a blue LED chip, the step S3 includes:
s311', judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first blue light threshold value, and judging whether the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the blue light standard frequency is smaller than a preset second threshold value;
and S321', if the full width at half maximum of the frequency spectrum is smaller than a preset first blue light threshold, and the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the standard frequency of the blue light is smaller than a preset second threshold, determining that the LED chip is the LED chip to be transferred.
In a specific embodiment, when the LED chip is a blue LED chip, comparing a full width at half maximum of a frequency spectrum in the frequency spectrum information with a preset first blue threshold, and comparing an absolute value of a difference between a frequency corresponding to a peak of the frequency spectrum in the frequency spectrum information and a standard frequency of blue light with a preset second threshold, when the full width at half maximum of the frequency spectrum is smaller than the preset first blue threshold, and the absolute value of the difference between the frequency corresponding to the peak of the frequency spectrum and the standard frequency of blue light is smaller than the preset second threshold, determining that the blue LED chip is the LED chip to be transferred.
In a specific embodiment, the step S3 is followed by the steps of:
s4, generating a position information file according to the position information of the LED chip to be transferred;
and S5, transferring the LED chip to be transferred according to the position information file.
In a specific embodiment, after the LED chips to be transferred are screened out according to the frequency spectrum information, a position information file is further generated according to the position information of the LED chips to be transferred or the LED chips not to be transferred, and the LED chips to be transferred are transferred according to the position information file.
In order to better understand the technology of the present invention, the present invention further provides a specific application example, as shown in fig. 2, which specifically includes the following steps:
step 201, receiving a light beam generated by an LED chip;
step 202, obtaining frequency spectrum information corresponding to the light beam;
step 203, judging whether the full width at half maximum of the frequency spectrum is smaller than a first threshold value; if yes, go to step 204, if no, go to step 206;
step 204, judging whether the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the standard frequency is smaller than a second threshold value; if yes, go to step 205, otherwise go to step 206;
step 205, determining the LED chip to be transferred;
and step 206, determining that the LED chip is not the LED chip to be transferred.
In another embodiment of the invention, a screening device corresponding to the screening method of the to-be-transferred LED chip is further provided. As shown in fig. 3, the apparatus includes: the detector 2 is used for receiving the light beam generated by the LED chip 1; a spectrum analyzer 3, said spectrum analyzer 3 being configured to perform a spectrum analysis on the light beam received by the detector 2; and the processor 4 is used for screening the LED chips 1 to be transferred according to the spectrum result obtained by the spectrum analyzer 3.
In a specific embodiment, the device further comprises a voltage applicator, wherein the LED chip 1 is disposed on the substrate 5, and the voltage applicator is configured to apply a driving voltage to the LED chip 1, so that the LED chip 1 generates a light beam.
In summary, the present invention provides a method and an apparatus for screening LED chips to be transferred, wherein the method comprises the steps of: receiving a light beam generated by the LED chip; carrying out spectrum analysis on the light beam to obtain spectrum information corresponding to the light beam; and screening the LED chips to be transferred according to the frequency spectrum information. The spectrum information corresponding to the light beam generated by the LED chip is compared with the preset threshold value to screen the LED chip to be transferred, the color purity of the screened LED chip is qualified and has no color difference, the luminous consistency is high, the light uniformity can be effectively distinguished for RGB display, and the mixed light color uniformity can be displayed.
It should be understood that the system application of the present invention is not limited to the above examples, and that modifications or changes may be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.

Claims (13)

1. A screening method of LED chips to be transferred is characterized by comprising the following steps:
receiving a light beam generated by the LED chip;
carrying out spectrum analysis on the light beam to obtain spectrum information corresponding to the light beam; the frequency spectrum information comprises the full width at half maximum of a frequency spectrum and the frequency corresponding to the peak of the frequency spectrum;
screening out the LED chips to be transferred according to the frequency spectrum information;
the step of screening out the LED chips to be transferred according to the frequency spectrum information specifically comprises the following steps:
judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first threshold value or not, and judging whether the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard frequency is smaller than a preset second threshold value or not;
if the full width at half maximum of the frequency spectrum is smaller than a preset first threshold value, and the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard frequency is smaller than a preset second threshold value, determining the LED chip to be a to-be-transferred LED chip;
the first threshold is a threshold set according to an average value of full widths at half maximum of frequency spectra in the frequency spectrum information of the plurality of LED chips; the standard frequency is a frequency set according to an average value of frequencies corresponding to peaks of the frequency spectrum in the spectrum information of the plurality of LED chips.
2. The method for screening LED chips to be transferred according to claim 1, wherein the step of receiving the light beams generated by the LED chips is preceded by the steps of:
and applying a driving voltage to the LED chip to enable the LED chip to generate a light beam.
3. The method for screening LED chips to be transferred according to claim 1, wherein the step of screening LED chips to be transferred according to the spectrum information further comprises:
obtaining spectrum information of a plurality of LED chips, and determining the first threshold value and the standard frequency according to the spectrum information.
4. The method for screening LED chips to be transferred according to claim 3, wherein the LED chips comprise red LED chips, green LED chips and blue LED chips.
5. The method for screening LED chips to be transferred according to claim 4, wherein the step of judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first threshold value further comprises the following steps:
and judging the type of the LED chip.
6. The method for screening LED chips to be transferred according to claim 4, wherein the first threshold value comprises a first red threshold value, a first green threshold value and a first blue threshold value; the standard frequencies include a red standard frequency, a green standard frequency, and a blue standard frequency.
7. The method for screening LED chips to be transferred according to claim 6, wherein the step of obtaining spectrum information of a plurality of LED chips and determining the first threshold and the standard frequency according to the spectrum information comprises:
obtaining frequency spectrum information of a plurality of red light LED chips, and determining the first red light threshold value and the red light standard frequency according to the frequency spectrum information;
obtaining spectrum information of a plurality of green light LED chips, and determining the first green light threshold value and the green light standard frequency according to the spectrum information;
obtaining spectrum information of a plurality of blue light LED chips, and determining the first blue light threshold value and the blue light standard frequency according to the spectrum information.
8. The method for screening the LED chips to be transferred according to claim 6, wherein when the LED chips are red LED chips, the step of screening the LED chips to be transferred according to the spectrum information comprises:
judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first red light threshold value or not, and judging whether the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard red light frequency is smaller than a preset second threshold value or not;
and if the full width at half maximum of the frequency spectrum is smaller than a preset first red light threshold value, and the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard frequency of the red light is smaller than a preset second threshold value, determining that the LED chip is the LED chip to be transferred.
9. The method for screening the LED chips to be transferred according to claim 6, wherein when the LED chips are green LED chips, the step of screening the LED chips to be transferred according to the spectrum information comprises:
judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first green light threshold value or not, and judging whether the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the green light standard frequency is smaller than a preset second threshold value or not;
and if the full width at half maximum of the frequency spectrum is smaller than a preset first green light threshold value, and the absolute value of the difference value between the frequency corresponding to the peak of the frequency spectrum and the green light standard frequency is smaller than a preset second threshold value, determining that the LED chip is the LED chip to be transferred.
10. The method for screening the LED chips to be transferred according to claim 6, wherein when the LED chips are blue LED chips, the step of screening the LED chips to be transferred according to the spectrum information comprises:
judging whether the full width at half maximum of the frequency spectrum is smaller than a preset first blue light threshold value or not, and judging whether the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard frequency of the blue light is smaller than a preset second threshold value or not;
and if the full width at half maximum of the frequency spectrum is smaller than a preset first blue light threshold value, and the absolute value of the difference value between the frequency corresponding to the wave crest of the frequency spectrum and the standard frequency of the blue light is smaller than a preset second threshold value, determining that the LED chip is the LED chip to be transferred.
11. The method for screening LED chips to be transferred according to claim 1, wherein the step of screening LED chips to be transferred according to the spectrum information further comprises:
generating a position information file according to the position information of the LED chip to be transferred;
and transferring the LED chip to be transferred according to the position information file.
12. A screening apparatus for LED chips to be transferred, for implementing the screening method for LED chips to be transferred according to any one of claims 1 to 11, comprising:
the detector is used for receiving the light beam generated by the LED chip;
the spectrum analyzer is used for carrying out spectrum analysis on the light beam to obtain spectrum information corresponding to the light beam;
and the processor is used for screening out the LED chips to be transferred according to the frequency spectrum information.
13. The device for screening LED chips to be transferred according to claim 12, further comprising:
and the voltage applier is used for applying a driving voltage to the LED chip to enable the LED chip to generate a light beam.
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