OLED Sealing Crack Detection via Embedded Interconnection
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Solution Overview
Problem
Organic light emitting diode display devices face challenges in detecting cracks in sealing materials before they lead to device failure, as minute cracks allow air, oxygen, and moisture to permeate, causing the display to malfunction over time without immediate indication.
Innovation Solution
Incorporating an interconnection within the sealing material and a test unit that measures voltage or current at both ends to compare with preset references, allowing for real-time detection of cracks by identifying differences in voltage or current levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an interconnection is disposed inside the sealing material to enable crack detection, then the reliability of crack detection is improved, but the device complexity increases
Solution Approach 1:
The interconnection is embedded within the sealing material structure, nesting the detection function inside the existing sealing component. This allows crack detection capability to be integrated without adding external complexity, as the interconnection is disposed inside the sealing material rather than adding separate external components.
Solution Approach 2:
The interconnection acts as an intermediary element that transfers electrical signals through the sealing material. By measuring voltage or current changes along this intermediate path, the system can detect cracks in the sealing material without directly contacting or complicating the sealing structure itself.
2Measurement precision
If a test unit is connected to measure voltage or current at both ends of the interconnection, then the measurement precision of crack detection is improved, but the device complexity increases
Solution Approach 1:
The test unit measures voltage or current at both ends of the interconnection using the existing electrical connections and power supply within the display device. The system uses its own operational electrical signals to perform self-diagnosis, eliminating the need for external measurement equipment and reducing overall device complexity.
Solution Approach 2:
The test unit compares measured voltage or current values against reference values to detect cracks. This feedback mechanism uses the existing electrical signal transmission through the interconnection, leveraging the device's own operational parameters for detection rather than requiring separate complex measurement systems.
3Strength
If the sealing material is cured by applying heat, then the sealing strength is improved, but the manufacturing time increases
Solution Approach 1:
The interconnection and test units are positioned and connected before the sealing material is applied and cured. This preliminary arrangement ensures that the detection system is in place before heating, allowing the sealing process to proceed without requiring extended curing time for additional components.
Solution Approach 2:
The interconnection serves dual purposes: it provides electrical connectivity for device operation and simultaneously acts as a detection path for crack identification. By merging the electrical connection function with the crack detection function, the system avoids adding separate components that would require additional manufacturing time.
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 early detection of cracks in the sealing material, preventing device failure by providing a method to determine the presence of cracks before abnormalities occur, thus extending the device's operational life and reducing unexpected failures.
Implementation Method 1
measuring a voltage or a current at both ends of the interconnection, and comparing the measured voltage or the measured current with a reference voltage or a reference current, respectively
Data Source
AI summary
An organic light emitting diode display device that includes a first substrate, a second substrate, a sealing material sealing a space between the first and second substrates and applied along an edge of the second substrate, an interconnection disposed inside the sealing material, and a test unit connected to both ends of the interconnection and configured to measure a preset voltage applied to the interconnection and compare the measured voltage with a reference voltage to determine whether a crack occurred in the sealing material or not. Further, the same effect can be obtained by measuring and comparing currents instead of the voltages.