LED Package Resin Inspection via Color Coordinate Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing detectors for light emitting device packages are expensive and difficult to implement on production lines, making it challenging to quickly detect defects related to the proper amount of light transmitting resin containing a light conversion material.
Innovation Solution
A testing apparatus that includes a lighting unit, camera, and controller to irradiate and image light emitting device packages with specific colored light, calculate color coordinates, and determine if the resin amount is proper by comparing them to a reference region, allowing for efficient detection of defects without high-priced devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-priced detectors are used to detect resin amount, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a camera to capture an optical image (copy) of the light emitting device package, and processes this image data to determine resin amount. This replaces expensive physical detectors with a visual copying approach, achieving accurate measurement through image analysis rather than direct physical measurement.
Solution Approach 2:
The patent replaces mechanical/optical detection systems with complex sensors with a simpler imaging system. By using a camera to capture light transmission characteristics and processing the image data computationally, the system achieves detector-level precision without the complexity of specialized detection hardware.
2Device complexity
If simple detection methods are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent measures resin amount indirectly by detecting optical parameters (light transmission intensity, color coordinates) rather than directly measuring physical quantity. By changing the measurement parameter from direct resin quantity to optical property, the system achieves accurate inference with simple equipment.
Solution Approach 2:
The patent introduces light as an intermediary to detect resin amount. The light transmission characteristics through the resin provide information about resin quantity, allowing indirect measurement through an intermediate optical property that can be captured by simple imaging equipment.
3Measurement precision
If traditional detectors are used, then measurement precision is improved, but productivity decreases due to cost and implementation difficulty
Solution Approach 1:
The patent uses a camera, which is a universal and versatile device, to perform defect detection functionality that traditionally required specialized detectors. This multi-functional approach allows the same imaging system to detect various defects (resin amount, foreign objects, structural issues) without requiring different specialized sensors for each defect type.
Solution Approach 2:
The patent replaces expensive, fragile, and complex detection devices with inexpensive, robust imaging equipment. The camera-based system is more durable, easier to maintain, and can be rapidly deployed on production lines, improving overall system reliability and productivity.
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
Enables affordable and versatile detection of proper resin amounts in light emitting device packages, ensuring the dispensed resin is adequate, thereby preventing defects and improving manufacturing efficiency.
Implementation Method 1
a light transmitting resin containing a light conversion material
Data Source
AI summary
An apparatus includes a lighting unit configured to irradiate a light emitting device package including a light transmitting resin containing a light conversion material with light having a certain color; a camera configured to capture an image of the light emitting device package; and a controller configured to determine color coordinates of the light emitting device package using the image, captured by the camera, to determine whether the light emitting device package is defective.