Micro LED Detection Using Hyperspectral Imaging
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Solution Overview
Problem
Conventional photoluminescence (PL) detection equipment cannot measure individual light-emitting diodes (LEDs) separately, resulting in low detection efficiency and requiring further inspection to identify specific defective LEDs, as they can only detect the spectrum of the entire field of view.
Innovation Solution
A micro light-emitting diode detection system comprising a first light generating module, a hyperspectral camera, and a control module, which sends a light signal to micro LEDs to generate second light signals, allowing the hyperspectral camera to acquire spectral imaging frames with spectral data of each LED, and the control module to determine defective LEDs based on this data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional PL detection equipment is used to detect the spectrum of the entire field of view, then the detection coverage is comprehensive, but the detection efficiency is low and individual LEDs cannot be measured separately
Solution Approach 1:
The patent applies segmentation by dividing the detection field into multiple regions corresponding to individual LED positions. The spectral imaging device captures spectra from different spatial locations simultaneously, allowing individual LED measurement while maintaining comprehensive coverage. This resolves the contradiction by enabling both high productivity (simultaneous detection of multiple LEDs) and high measurement precision (individual LED spectral analysis).
Solution Approach 2:
The patent transitions from one-dimensional spectral detection to two-dimensional spectral imaging by adding spatial dimension to the detection. The spectral imaging device captures both spectral information and spatial position information, enabling individual LED identification and separate measurement. This dimensional expansion allows simultaneous comprehensive coverage and individual precision measurement.
2Reliability
If conventional PL detection equipment detects the entire field of view, then all LEDs are covered, but re-inspection is required to identify specific defective LEDs
Solution Approach 1:
The patent introduces spatial position information as an intermediary that links spectral data to specific LED locations. The spectral imaging device captures both spectral characteristics and positional information simultaneously, creating a direct mapping between detected spectra and LED positions. This eliminates the need for re-inspection while maintaining detection completeness, as defective LEDs can be immediately identified with their positions.
Solution Approach 2:
The patent replaces the mechanical re-inspection process with automated spectral imaging analysis. Instead of manually re-inspecting LEDs to identify defects, the system uses spectral imaging to automatically detect and locate defective LEDs through their spectral characteristics. This substitution eliminates re-inspection time while maintaining reliable defect detection.
3Productivity
If conventional PL detection equipment is used, then the detection process is simple, but the detection speed is slow
Solution Approach 1:
The patent applies universality by designing a spectral imaging device that performs multiple functions simultaneously: spectral analysis, spatial positioning, and defect identification. This multi-functional device achieves high detection speed without requiring multiple separate inspection systems, thereby managing complexity while improving productivity.
Solution Approach 2:
The patent changes the detection parameter from simple intensity measurement to spectral analysis. By detecting spectral characteristics rather than just light intensity, the system achieves faster and more accurate defect identification. This parameter change enables high-speed detection while the automated analysis keeps the system manageable in complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system enables simultaneous and accurate detection of multiple micro LEDs, improving detection efficiency by analyzing spectral data in real-time, reducing the need for re-inspection and increasing production speed.
Implementation Method 1
Photoluminescence (PL) is the earliest detection method to be industrialized in the industry... The first light generating module is configured to send a first light signal to a plurality of micro light-emitting diodes to be detected, such that the plurality of micro light-emitting diodes to be detected generate second light signals
Implementation Method 2
The hyperspectral camera is configured to acquire the second light signals, to obtain a spectral imaging frame including spectral data of each of the plurality of micro light-emitting diodes to be detected
Data Source
AI summary
A micro light-emitting diode detection system includes: a first light generating module configured to send a first light signal to a plurality of micro light-emitting diodes to be detected, such that the plurality of micro light-emitting diodes to be detected generate second light signals, the first light signal including a laser signal; a hyperspectral camera configured to acquire the second light signals, to obtain a spectral imaging frame including spectral data of each of the plurality of micro light-emitting diodes to be detected; and a control module connected to the hyperspectral camera, and configured to determine, based on the spectral imaging frame, a defective micro light-emitting diode from the plurality of micro light-emitting diodes to be detected.