LED Wafer Testing with Bidirectional Optical Measurement
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Solution Overview
Problem
Existing LED testing methods struggle to efficiently and accurately measure optical and luminance characteristics of multiple LEDs without requiring apparatus reconfiguration or moving the LEDs during different testing phases.
Innovation Solution
A testing apparatus and method that uses a common optical system for bidirectional wavelength and photoelectric signal measurement, allowing simultaneous testing of multiple LEDs on a wafer or panel without reconfiguration, utilizing a bifurcated fiber to combine light measurement and irradiation, and a control unit to manage electrical and optical operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate configurations and movements are used to perform wavelength and photoelectric signal measurements, then measurement completeness is improved, but testing time increases and measurement accuracy deteriorates due to environmental differences
Solution Approach 1:
The patent combines wavelength measurement and photoelectric signal measurement into a single integrated testing operation. The light measurement unit simultaneously captures both wavelength characteristics and photoelectric signals from LEDs in one measurement session, eliminating the need for separate configurations and movements. This merging approach resolves the contradiction by achieving both measurement completeness and environmental consistency while reducing testing time.
Solution Approach 2:
The light measurement unit is designed with multi-functionality to perform both wavelength measurement and photoelectric signal measurement. This universal device can switch between different measurement modes without requiring separate specialized equipment or reconfiguration, thereby maintaining measurement accuracy while reducing overall testing time through integrated operation.
2Measurement precision
If separate configurations and movements are used to perform wavelength and photoelectric signal measurements, then measurement completeness is improved, but device complexity increases
Solution Approach 1:
The patent merges wavelength measurement and photoelectric signal measurement functions into a single integrated system. The light measurement unit combines spectral analysis capabilities with photoelectric detection, eliminating the need for separate measurement apparatus and reducing overall device complexity while maintaining comprehensive measurement accuracy.
Solution Approach 2:
The light measurement unit is designed as a universal device that can perform multiple measurement functions (wavelength and photoelectric signal) through a single integrated platform. This multi-functionality reduces the number of separate devices and configurations needed, thereby simplifying the overall apparatus while maintaining measurement completeness and accuracy.
3Adaptability or versatility
If configuration changes and movement are required for different measurements, then measurement versatility is improved, but reliability deteriorates due to environmental differences
Solution Approach 1:
The patent combines multiple measurement functions within a single stationary light measurement unit that simultaneously or sequentially performs wavelength and photoelectric signal measurements without requiring apparatus reconfiguration or LED movement. This merging approach maintains measurement versatility through software-controlled multi-functionality while ensuring measurement reliability by eliminating environmental variations caused by physical movements.
Solution Approach 2:
The light measurement unit is designed as a universal instrument capable of performing diverse measurement tasks (wavelength and photoelectric signal measurements) through integrated functionality. This multi-functional design achieves measurement versatility without requiring configuration changes or movements, thereby maintaining consistent environmental conditions and improving measurement reliability.
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
Enhances testing efficiency by reducing execution time and minimizing measurement errors, while improving accuracy in detecting abnormalities in LED performance characteristics.
Implementation Method 1
one of a pair of LEDs to be inspected is caused to emit light and the other is caused to receive the light, and a current value of a current output by a photoelectric effect is used to inspect optical characteristics of the LEDs
Data Source
AI summary
Provided is a testing apparatus including: a light emission control unit which causes a plurality of light emitting elements to be tested to emit light; a light measurement unit which receives the light emitted from the plurality of light emitting elements and measures wavelengths of the received light; and a determination unit which determines whether there is an abnormality in at least one light emitting element on the basis of intensity distributions of the wavelengths of the light, which is emitted from the plurality of light emitting elements, measured by the light measurement unit. The testing apparatus may further include: a light source; an optical system which irradiates the plurality of light emitting elements with light emitted from the light source; and an electrical measurement unit which measures a photoelectric signal obtained by each of the plurality of light emitting elements photoelectrically converting the light radiated by the optical system.