Matrix Camera Visual Inspection for Display Panel Defects
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Solution Overview
Problem
Current visual inspection methods for display panels are inefficient, often requiring extensive time and leading to errors in identifying defective panels, as they lack the capability for high-speed, accurate defect detection and adaptability across various product groups.
Innovation Solution
A visual inspection apparatus equipped with a matrix arrangement of cameras and a processor for image processing, along with adjustable light sources and optical sheets, allows for rapid and precise detection of defects by photographing and analyzing display panels, distinguishing between genuine defects and contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional visual inspection methods are used, then inspection simplicity is maintained, but inspection speed and accuracy deteriorate
Solution Approach 1:
The inspection system is segmented into multiple independent camera units arranged in a matrix, where each camera captures a specific region of the display panel. This segmentation enables parallel processing of multiple areas simultaneously, dramatically increasing inspection speed while keeping each individual camera unit relatively simple.
Solution Approach 2:
Multiple camera units are merged into a coordinated inspection system with unified control and image processing. The cameras work together as an integrated system, combining their individual capabilities to achieve high-speed, comprehensive inspection that exceeds what a single camera could accomplish.
2Measurement precision
If manual inspection by naked eye is used, then equipment cost is reduced, but inspection accuracy and consistency deteriorate
Solution Approach 1:
The manual visual inspection process is replaced with an automated optical inspection system using multiple cameras and image processing algorithms. This substitution eliminates human error and subjectivity, providing consistent, high-precision defect detection while automating the inspection process.
Solution Approach 2:
The inspection system creates digital copies (images) of the display panel using multiple cameras, allowing for detailed analysis and defect detection without physical contact. These digital copies can be processed, stored, and analyzed with high precision, replacing the need for direct human visual assessment.
3Adaptability or versatility
If inspection parameters are optimized for specific product groups, then inspection accuracy for that group improves, but adaptability to other products deteriorates
Solution Approach 1:
The inspection system is designed with universal adaptability through its matrix camera arrangement and programmable control unit, capable of inspecting various display panel sizes and types. By configuring the cameras and processing algorithms appropriately, the same system can maintain high inspection accuracy across different product groups without requiring dedicated equipment for each product type.
Solution Approach 2:
The inspection system incorporates dynamic configurability where inspection parameters, camera positioning, and processing algorithms can be adjusted and optimized for different product groups. This dynamic adaptation allows the system to maintain high precision across varying inspection requirements while using the same physical infrastructure.
4Measurement precision
If inspection time is extended to improve accuracy, then defect detection quality improves, but manufacturing throughput deteriorates
Solution Approach 1:
The matrix arrangement of multiple cameras enables continuous, simultaneous inspection of multiple display panel regions in parallel. This continuous parallel processing maintains high defect detection quality by thoroughly examining all areas while significantly reducing total inspection time compared to sequential inspection methods, thereby preserving manufacturing throughput.
Data Source
AI summary
A visual inspection apparatus includes a plurality of cameras for photographing a display panel and a processor for processing the photographed image. Specifically, the visual inspection apparatus includes: a work table having a panel mounting unit on which a display panel is mounted; a camera module which is disposed in a direction normal to the panel mounting unit and which has a plurality of cameras arranged in a matrix; and a processor for processing the images of the display panel photographed with the cameras. The plurality of cameras is arranged in a matrix with variable distances between the cameras. Since the visual inspection apparatus includes the cameras arranged in a matrix, it can be used to effectively detect a variety of defects.