CN-121477029-B - Detection method, device and system for LED lamp beads and storage medium

CN121477029BCN 121477029 BCN121477029 BCN 121477029BCN-121477029-B

Abstract

The invention relates to a detection method, a device, a system and a storage medium of an LED lamp bead, which comprise the following steps of conducting an electrifying test on an electrode of the LED lamp bead to obtain an initial current value of the LED lamp bead, applying a step voltage to the LED lamp bead based on the initial current value to obtain a voltage-current curve, conducting luminous detection on the LED lamp bead corresponding to a rated working point in the voltage-current curve through an optical detector to obtain a facula image, conducting a reverse voltage test on the LED lamp bead based on the facula image to obtain a reverse leakage current value, and conducting quality evaluation on the LED lamp bead based on the voltage-current curve, the facula image and the reverse leakage current value to obtain a quality evaluation result of the LED lamp bead.

Inventors

LI FEI

Assignees

山西星心半导体科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260108

Claims (8)

1. The detection method of the LED lamp beads is characterized by comprising the following steps of: carrying out an electrifying test on the electrode of the LED lamp bead to obtain an initial current value of the LED lamp bead; applying a step voltage to the LED lamp beads based on the initial current value to obtain a voltage-current curve; carrying out luminescence detection on the LED lamp beads corresponding to the rated working points in the voltage-current curve through an optical detector to obtain a facula image; Based on the facula image, carrying out reverse voltage test on the LED lamp beads to obtain a reverse leakage current value; Based on the voltage-current curve, the light spot image and the reverse leakage current value, performing quality evaluation on the LED lamp beads to obtain quality evaluation results of the LED lamp beads; based on the facula image, carry out reverse voltage test to LED lamp pearl, obtain reverse leakage current value, include: Carrying out brightness distribution scanning on the facula image to obtain facula brightness data, carrying out uniformity analysis on the facula brightness data to obtain a brightness distribution diagram, and triggering a reverse voltage test flow based on information of the brightness distribution diagram, wherein the brightness distribution diagram shows whether a local over-dark or over-bright area exists in the facula; Applying reverse voltage to the LED lamp beads based on the brightness distribution diagram to obtain reverse current sampling data, and performing time domain analysis on the reverse current sampling data to obtain a reverse current curve; Performing numerical extraction on a current stabilizing section in the reverse current curve to obtain a steady-state current value, and performing calibration compensation on the steady-state current value to obtain a reverse leakage current value, wherein the reverse leakage current value is stored in association with a brightness distribution diagram and is used for comprehensively evaluating whether the LED lamp beads have photoelectric double abnormity caused by internal defects; Applying reverse voltage to the LED lamp beads based on the brightness distribution diagram to obtain reverse current sampling data, wherein the reverse current sampling data comprises the following steps: the method comprises the steps that a timing control module is used for conducting closing operation on the luminous state of the LED lamp beads to obtain a extinction state signal, and conducting stability judgment on the extinction state signal to obtain an extinction confirmation result; based on the extinction confirmation result, applying a stepwise increasing reverse voltage to the LED lamp beads through a voltage switching device to obtain a reverse voltage response signal, and detecting the rising edge of the reverse voltage response signal to obtain a voltage switching moment; based on the voltage switching moment, the reverse current of the LED lamp bead is collected at fixed time through the synchronous sampling unit to obtain an original current sampling sequence, and the original current sampling sequence is subjected to time domain filtering processing to obtain reverse current sampling data.
2. The method for detecting an LED lamp bead according to claim 1, wherein the step of conducting an energization test on an electrode of the LED lamp bead to obtain an initial current value of the LED lamp bead comprises: The method comprises the steps of enabling a test probe to be in contact with the anode and the cathode of the LED lamp bead through a probe table so as to apply preset test voltage to obtain an electrode contact signal, conducting verification on the electrode contact signal, and obtaining a contact conduction result; and maintaining a preset test voltage for the LED lamp beads with good contact based on the contact conduction result to obtain real-time current data, and extracting a stable value of the real-time current data to obtain an initial current value.
3. The method of claim 1, wherein applying a stepped voltage to the LED light beads based on the initial current value to obtain a voltage-current curve comprises: determining a voltage starting point based on the initial current value, applying incremental voltage starting from the voltage starting point to the LED lamp beads to obtain multiple groups of voltage-current corresponding data, and screening abnormal values of the voltage-current corresponding data to obtain effective voltage-current data; Continuously recording the effective voltage and current data to obtain a voltage and current time sequence, wherein the voltage and current time sequence comprises voltage and current data pairs which are arranged in time sequence; And performing coordinate mapping on the smooth curve data to obtain voltage-current scattered point distribution, wherein the voltage-current scattered point distribution comprises discrete data points with voltage as a horizontal axis and current as a vertical axis, and performing continuous curve fitting based on the voltage-current scattered point distribution to obtain a voltage-current curve.
4. The method for detecting LED lamp beads according to claim 1, wherein the obtaining a light spot image based on the light emission detection of the LED lamp beads corresponding to the rated operating point in the voltage-current curve by the optical detector comprises: The method comprises the steps that an optical detector is used for carrying out luminous collection on LED lamp beads at rated working points in a voltage-current curve to obtain original optical signal data, and photoelectric conversion is carried out on the optical signal data to obtain an initial facula image; performing region interception based on the initial light spot image to obtain an effective light spot region, and performing gray scale calibration on the effective light spot region to obtain a calibrated light spot image; and carrying out pixel sharpening processing on the calibration light spot image to obtain a clear light spot image, and carrying out edge contour extraction on the clear light spot image to obtain a light spot image.
5. The method for detecting an LED lamp bead according to claim 1, wherein the quality evaluation of the LED lamp bead based on the voltage-current curve, the spot image and the reverse leakage current value, to obtain a quality evaluation result of the LED lamp bead, comprises: extracting characteristic parameters of the voltage-current curve to obtain electrical performance parameters, analyzing luminous characteristics of the facula image to obtain optical performance parameters, and analyzing stability of the reverse leakage current value to obtain leakage current stability parameters; Based on the electrical performance parameter, the optical performance parameter and the leakage current stability parameter, respectively comparing with a preset electrical performance threshold range, an optical performance threshold range and a leakage current stability threshold range to obtain a comprehensive comparison result set; And carrying out quality evaluation on the LED lamp beads based on the comprehensive comparison result set to obtain quality evaluation results of the LED lamp beads.
6. A detection device for an LED lamp bead, employing the detection method of any one of claims 1 to 5, comprising: the first test module is used for conducting an electrifying test on the electrode of the LED lamp bead to obtain an initial current value of the LED lamp bead; the application module is used for applying step-type voltage to the LED lamp beads based on the initial current value to obtain a voltage-current curve; the detection module is used for carrying out luminous detection on the LED lamp beads corresponding to the rated working points in the voltage-current curve through the optical detector to obtain a facula image; The second test module is used for carrying out reverse voltage test on the LED lamp beads based on the facula images to obtain a reverse leakage current value; and the evaluation module is used for carrying out quality evaluation on the LED lamp beads based on the voltage-current curve, the light spot image and the reverse leakage current value to obtain a quality evaluation result of the LED lamp beads.
7. A detection system for LED light beads, comprising a memory and a processor, said memory having stored therein a computer program, characterized in that the processor, when executing said computer program, carries out the steps of the method according to any one of claims 1 to 5.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.

Description

Detection method, device and system for LED lamp beads and storage medium Technical Field The invention relates to the technical field of LED lamp beads, in particular to a detection method, a detection device, a detection system and a storage medium of an LED lamp bead. Background With the rapid development of LED technology, LED lamp beads have been widely used in various fields such as lighting, display, backlight and automobiles due to their advantages of high energy efficiency, long service life and environmental protection. However, the LED lamp beads are affected by factors such as material defects and packaging process fluctuation in the production process, and the photoelectric properties of the LED lamp beads are subject to individual differences, and early failure risks exist in part. Therefore, the accurate and comprehensive quality detection of the LED lamp beads becomes a key link for guaranteeing the reliability and consistency of products. The traditional detection method is mainly focused on simple on-off test or single parameter measurement, is difficult to comprehensively reflect the comprehensive performance of the LED lamp beads, and cannot meet the strict requirements of high-end application on quality control. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a detection method, a detection device, a detection system and a storage medium for LED lamp beads. The technical scheme adopted by the invention is as follows: in one aspect, an embodiment of the present invention provides a method for detecting an LED lamp bead, including the following steps: carrying out an electrifying test on the electrode of the LED lamp bead to obtain an initial current value of the LED lamp bead; applying a step voltage to the LED lamp beads based on the initial current value to obtain a voltage-current curve; carrying out luminescence detection on the LED lamp beads corresponding to the rated working points in the voltage-current curve through an optical detector to obtain a facula image; Based on the facula image, carrying out reverse voltage test on the LED lamp beads to obtain a reverse leakage current value; and carrying out quality evaluation on the LED lamp beads based on the voltage-current curve, the light spot image and the reverse leakage current value to obtain a quality evaluation result of the LED lamp beads. Further, the electrode of the LED lamp bead is subjected to an energizing test to obtain an initial current value of the LED lamp bead, including: The method comprises the steps of enabling a test probe to be in contact with the anode and the cathode of the LED lamp bead through a probe table so as to apply preset test voltage to obtain an electrode contact signal, conducting verification on the electrode contact signal, and obtaining a contact conduction result; and maintaining a preset test voltage for the LED lamp beads with good contact based on the contact conduction result to obtain real-time current data, and extracting a stable value of the real-time current data to obtain an initial current value. Further, based on the initial current value, applying a step voltage to the LED lamp bead to obtain a voltage-current curve, including: determining a voltage starting point based on the initial current value, applying incremental voltage starting from the voltage starting point to the LED lamp beads to obtain multiple groups of voltage-current corresponding data, and screening abnormal values of the voltage-current corresponding data to obtain effective voltage-current data; Continuously recording the effective voltage and current data to obtain a voltage and current time sequence, wherein the voltage and current time sequence comprises voltage and current data pairs which are arranged in time sequence; And performing coordinate mapping on the smooth curve data to obtain voltage-current scattered point distribution, wherein the voltage-current scattered point distribution comprises discrete data points with voltage as a horizontal axis and current as a vertical axis, and performing continuous curve fitting based on the voltage-current scattered point distribution to obtain a voltage-current curve. Further, based on the light emitting detection of the LED lamp beads corresponding to the rated operating point in the voltage-current curve by the optical detector, a light spot image is obtained, including: The method comprises the steps that an optical detector is used for carrying out luminous collection on LED lamp beads at rated working points in a voltage-current curve to obtain original optical signal data, and photoelectric conversion is carried out on the optical signal data to obtain an initial facula image; performing region interception based on the initial light spot image to obtain an effective light spot region, and performing gray scale calibration on the effective l