LED Test Apparatus Using Segmented Photodetectors for Simultaneous Optical Inspection
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Solution Overview
Problem
Existing methods for inspecting the optical properties of LEDs require individual testing, making it inefficient to collectively assess multiple LEDs and prone to interference between adjacent LEDs, which complicates the identification of faulty LEDs.
Innovation Solution
A test apparatus that electrically connects multiple LEDs, collectively irradiates them with light, and measures photoelectric signals to determine pass or fail based on statistical normal ranges, allowing simultaneous testing and accurate identification of faulty LEDs without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual LED testing is performed sequentially, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The patent segments the measurement process by assigning dedicated photodetectors to specific LED positions, allowing simultaneous measurement of multiple LEDs while maintaining individual measurement precision through spatial separation and dedicated detection paths for each LED
2Productivity
If multiple LEDs are tested collectively, then productivity is improved, but measurement precision deteriorates due to interference
Solution Approach 1:
The patent divides the measurement system into spatially separated detection zones with dedicated photodetectors for each LED position, enabling collective testing of multiple LEDs while preventing optical interference through physical separation and position-specific detection paths
Solution Approach 2:
The patent introduces optical isolation mechanisms and position-specific optical paths as intermediaries between multiple LEDs and photodetectors, allowing simultaneous measurement while preventing cross-interference through controlled light transmission paths
3Device complexity
If individual LED testing is performed, then faulty LED identification is simplified, but loss of time increases
Solution Approach 1:
The patent segments the detection system with dedicated photodetectors for each LED position, enabling simultaneous measurement of multiple LEDs and direct comparison of results to quickly identify faulty LEDs through position-specific measurement data without sequential testing delays
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
The apparatus enables rapid and accurate assessment of multiple LEDs' optical properties, reducing processing time and identifying faulty LEDs effectively by using a statistical normal range for determination.
Implementation Method 1
measuring unit which measures a photoelectric signal that each of the plurality of LEDs outputs via the electrical connection unit after photoelectrically converting the light with which the light source unit irradiates the plurality of LEDs
Data Source
AI summary
A test apparatus includes an electrical connection unit electrically connected to respective terminal of each of a plurality of LEDs to be tested, a light source unit which collectively irradiates the plurality of LEDs with light, a measuring unit which measures a photoelectric signal that each of the plurality of LEDs outputs via the electrical connection unit after photoelectrically converting the light with which the light source unit irradiates the plurality of LEDs, and a determination unit which determines pass or fail of each of the plurality of LEDs based on the measurement results by the measuring unit.