Flexible Film Defect Detection Using Light-Absorbing Patterns
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Solution Overview
Problem
Existing flexible film technologies face challenges in accurately detecting defects, particularly in thin, small, and lightweight display devices, where traditional defect detection methods are inadequate for ensuring high precision and reliability.
Innovation Solution
A flexible film package is designed with a base substrate that has light transmission and flexibility, featuring a line area with circuit lines and a test area with a detection pattern made of light-absorbing material, including dummy lines and sub-detection patterns for improved defect detection accuracy. The film package includes a method for manufacturing, where a parent film is processed to identify and remove defective areas, enhancing defect detection and sorting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional defect detection methods are used, then the manufacturing process is simple, but the defect detection accuracy is insufficient
Solution Approach 1:
A detection pattern layer is introduced as an intermediary between the base substrate and the external environment. This detection pattern layer includes light-absorbing materials and specific geometric patterns that mediate the interaction between light and the flexible film, enabling accurate defect detection without complicating the base substrate structure
Solution Approach 2:
The detection pattern utilizes light absorption properties through specific material selection, creating optical contrast that enables defect detection. The pattern's optical characteristics change based on the presence of defects, allowing detection systems to identify anomalies through optical property variations
2Measurement precision
If a detection pattern with light-absorbing material is added, then defect detection accuracy improves, but the film structure becomes more complex
Solution Approach 1:
The flexible film is segmented into distinct functional areas: a line area for signal transmission and a test area for defect detection. The detection pattern is further segmented into specific geometric shapes arranged in predetermined patterns, allowing systematic defect detection while maintaining clear functional separation
Solution Approach 2:
The detection pattern serves multiple functions simultaneously: it acts as a test structure for defect detection, provides optical contrast for imaging, and maintains flexibility with the base substrate. The same structural elements serve both mechanical and optical detection purposes
3Measurement precision
If the base substrate has high light transmittance, then the detection pattern contrast improves, but the substrate material selection is limited
Solution Approach 1:
The optical properties of the base substrate are optimized by controlling light transmittance parameters. The substrate is designed with specific transmittance characteristics that maximize contrast with the light-absorbing detection pattern while maintaining flexibility and manufacturability
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 solution significantly improves defect detection accuracy by utilizing light transmission properties and distinct patterns to differentiate between defective and non-defective areas, allowing for precise cutting and sorting of film areas, thereby enhancing the reliability of flexible films in display devices.
Implementation Method 1
a detection pattern at the test area, and including a material having a light absorption property
Data Source
AI summary
Provided is a method for manufacturing a flexible film. The method for the manufacturing the flexible film includes providing a parent film on which a plurality of film areas are defined, each of which having a detection pattern formed thereon, applying a voltage to each of the film areas to detect whether a defect exists, removing the detection pattern from respective ones of the film areas on which the defect is detected, and cutting out others of the film areas on which the defect is not detected.